阅读说明：本技术 柔性温度传感器及电池包 (Flexible temperature sensor and battery pack ) 是由 杨思恒 陈得良 阳星 于 2021-05-31 设计创作，主要内容包括：本发明涉及一种柔性温度传感器,包括热敏电阻、铜质基板和第一FPC薄膜,第一FPC薄膜包裹基板以构成一柔性电路板,于第一FPC薄膜上开设有器件窗口以贴装热敏电阻以及开设有电接窗口以搭接柔性导线。另外还涉及采用该柔性温度传感器的电池包。该温度传感器具有柔性特点,能从容地适应安装空间狭小等工况；FPC薄膜包裹基板能提高温度传感器的绝缘性能和耐温性能,提高该温度传感器的工作可靠性；铜质基板还具有良好的导热性能,能显著地增大温度传感器的感温面积,从而能有效地提高温度传感器的感温敏感性和检测准确性；因此,该温度传感器具有结构简单、安装方便、工作可靠性高等优点,能较好地满足电池包等的温度监测要求。(The invention relates to a flexible temperature sensor which comprises a thermistor, a copper substrate and a first FPC film, wherein the first FPC film wraps the substrate to form a flexible circuit board, a device window is arranged on the first FPC film to mount the thermistor, and an electric connection window is arranged on the first FPC film to lap a flexible lead. Still relate to the battery package that adopts this flexible temperature sensor in addition. The temperature sensor has the characteristic of flexibility, and can be leisurely adapted to working conditions such as narrow installation space and the like; the FPC film wrapping substrate can improve the insulation performance and temperature resistance of the temperature sensor and improve the working reliability of the temperature sensor; the copper substrate also has good heat-conducting property, and can remarkably increase the temperature sensing area of the temperature sensor, thereby effectively improving the temperature sensing sensitivity and the detection accuracy of the temperature sensor; therefore, the temperature sensor has the advantages of simple structure, convenience in installation, high working reliability and the like, and can better meet the temperature monitoring requirements of battery packs and the like.)

1. A flexible temperature sensor comprising a thermistor, characterized in that: the thermistor is attached to the device mounting position, and a flexible lead is connected to the electrical connection position in a lap joint mode.

2. The flexible temperature sensor of claim 1, wherein: the thermistor is enclosed in a shielding action area of the thermistor, and the electromagnetic shielding plate is wrapped in the first FPC film.

3. The flexible temperature sensor of claim 2, wherein: the electromagnetic shielding plate is made of copper sheets, is arranged around the substrate and has a transverse clearance with the substrate.

4. The flexible temperature sensor of claim 1, wherein: the first FPC film is adhered to the first surface of the substrate, the thermistor is arranged on the first surface of the substrate, and the reinforcing plate is an annular plate and encloses the thermistor in an inner ring of the annular plate.

5. The flexible temperature sensor of claim 4, wherein: the reinforcing plate is a hard metal plate.

6. The flexible temperature sensor of claim 1, wherein: the substrate comprises two flexible electrode plates which are arranged at intervals, two pins of the thermistor are respectively welded with the two flexible electrode plates, and the flexible lead is respectively connected with the two flexible electrode plates.

7. The flexible temperature sensor of claim 1, wherein: electromagnetic shielding wires are respectively arranged on two sides of the flexible lead and between the two lead bodies of the flexible lead, and the electromagnetic shielding wires and the flexible lead are arranged on the same plane.

8. The flexible temperature sensor of claim 7, wherein: the flexible conducting wire and the electromagnetic shielding wires are wrapped in the second FPC film.

9. The flexible temperature sensor of claim 7, wherein: the flexible lead and the electromagnetic shielding wire are both strip-shaped copper sheets.

10. The utility model provides a battery pack, includes the battery case and locates at least a set of battery module in the battery case, the battery case includes box body and lid, its characterized in that: the flexible temperature sensor is attached to the surface of a battery cell to be tested, or the flexible temperature sensor is attached to the box cover and is positioned right above the battery to be tested.

Technical Field

The invention relates to a flexible temperature sensor and a battery pack using the same.

Background

Temperature sensors for battery packs generally need to have the following characteristics: the temperature response is fast, can be high temperature resistant for a long time, the installation is convenient, and the voltage-resistant insulating property is high. At present, the requirements of the temperature sensor on high response, accurate temperature measurement and high stability are generally solved through the optimization of the structure and the process, the reasonable energy distribution of the new energy automobile is ensured, and the purpose of monitoring the safety of the whole automobile is achieved. The battery pack generally has one or more groups of battery modules, and the temperature sensor installation quantity is more, but installation space is limited in the battery pack, has influenced temperature sensor's installation, has perhaps restricted temperature sensor's installation quantity, has perhaps restricted temperature sensor's mounted position, therefore it is necessary to optimize temperature sensor's installation convenience.

Disclosure of Invention

The invention relates to a flexible temperature sensor and a battery pack adopting the same, which can at least solve part of defects in the prior art.

The invention relates to a flexible temperature sensor which comprises a thermistor, a substrate and a first FPC film, wherein the substrate is a copper flexible board, the first FPC film wraps the substrate to form a flexible circuit board, a device mounting position and an electrical connection position are arranged on the first FPC film, a device window is formed in the first FPC film to expose the substrate, the electrical connection position is formed in the first FPC film to expose the substrate, the thermistor is attached to the device mounting position, and a flexible lead is connected to the electrical connection position in a lap joint mode.

In one embodiment, the flexible temperature sensor further comprises an electromagnetic shielding plate, the electromagnetic shielding plate is a flexible plate and encloses the thermistor in a shielding action area, and the first FPC film also encloses the electromagnetic shielding plate.

In one embodiment, the electromagnetic shielding plate is a copper sheet, and the electromagnetic shielding plate is arranged around the substrate and has a transverse clearance with the substrate.

In one embodiment, the flexible temperature sensor further includes a reinforcing plate adhered to the first FPC film and located on the same side of the substrate as the thermistor, and the reinforcing plate is an annular plate and encloses the thermistor in an inner ring thereof.

In one embodiment, the reinforcing plate is a hard metal plate.

As one embodiment, the substrate includes two flexible electrode plates arranged at intervals, two pins of the thermistor are respectively welded to the two flexible electrode plates, and the flexible lead is respectively connected to the two flexible electrode plates.

As one embodiment, electromagnetic shielding wires are respectively disposed on two sides of the flexible lead wire and between two wire bodies of the flexible lead wire, and each electromagnetic shielding wire and the flexible lead wire are arranged in the same plane.

As one embodiment, the flexible temperature sensor further comprises a second FPC film, and the second FPC film encloses the flexible wires and the electromagnetic shielding films.

As one embodiment, the flexible conducting wire and the electromagnetic shielding wire both use strip-shaped copper sheets.

The invention also relates to a battery pack which comprises a battery box and at least one group of battery modules arranged in the battery box, wherein the battery box comprises a box body and a box cover, and the battery pack also comprises a plurality of flexible temperature sensors, wherein the flexible temperature sensors are attached to the surface of the electric core of the battery to be tested, or the flexible temperature sensors are attached to the box cover and positioned right above the battery to be tested.

The invention has at least the following beneficial effects:

the invention adopts the FPC film to wrap the substrate and leads out the flexible lead, so that the temperature sensor has the characteristic of flexibility and can be easily adapted to the working conditions of narrow installation space and the like; the FPC film is adopted to wrap the substrate, so that the insulation effect and the temperature resistance of the temperature sensor can be improved, the conditions that the substrate is made of conductive metal such as copper sheets and short circuit is easy to occur when the substrate is exposed and installed can be avoided, and the working reliability of the temperature sensor is improved; in addition, the copper substrate has a good heat-conducting property besides a flexible effect and can be used as a conductive channel, and the temperature sensing area of the temperature sensor can be remarkably increased, so that the temperature sensing sensitivity and the detection accuracy of the temperature sensor can be effectively improved; therefore, the temperature sensor has the advantages of simple structure, convenience in installation, high working reliability and the like, and can better meet the temperature monitoring requirements of battery packs and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic plan view of a flexible temperature sensor according to an embodiment of the present invention;

fig. 2 is a perspective view of a flexible temperature sensor (not shown in the FPC film) according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

As shown in fig. 1, an embodiment of the present invention provides a flexible temperature sensor, including a thermistor 11, a substrate 12 and a first FPC film 13, where the substrate 12 is a copper flexible board, the first FPC film 13 wraps the substrate 12 to form a flexible circuit board, the first FPC film 13 is provided with a device window to expose a device mounting location of the substrate 12 and an electrical connection window to expose an electrical connection location of the substrate 12, the thermistor 11 is attached to the device mounting location, and a flexible lead 21 is connected to the electrical connection location in a lap joint manner.

The thermistor 11 is a conventional element in the art; the thermistor 11 is preferably fixed to the substrate 12 by soldering (i.e., connected to the exposed device mounting site of the substrate 12) by a patch method, for example, by soldering, and the thermistor 11 is more preferably protected by coating with an insulating varnish or an insulating silicone.

Preferably, the substrate 12 is made of copper sheet, which has good flexibility and bending property and conductivity. In one embodiment, as shown in fig. 1 and fig. 2, the substrate 12 includes two flexible electrode plates arranged at intervals, two pins of the thermistor 11 are respectively welded to the two flexible electrode plates, and the flexible leads 21 are respectively connected to the two flexible electrode plates; when the substrate 12 is made of copper sheets, the two flexible electrode plates are made of two copper sheets correspondingly, and a welding structure or a crimping structure can be adopted between the flexible lead 21 and the flexible electrode plates. The electric connection between the thermistor 11 and the lead 21 is realized through the substrate 12, so that the installation of the thermistor 11 is facilitated, and the working reliability of the temperature sensor can be improved by enabling the conductive circuit of the temperature sensor to be a fully flexible circuit.

The FPC film is an existing product and can be purchased from the market; the first FPC film 13 is fixedly connected to the substrate 12 after wrapping the substrate 12, in one embodiment, the first FPC film 13 is connected to the substrate 12 by thermal compression, and particularly, the substrate 12 is made of a copper sheet, so that the working reliability of the flexible circuit board is ensured.

According to the temperature sensor provided by the embodiment, the FPC film is adopted to wrap the substrate 12 and the flexible lead 21 is led out, so that the temperature sensor has the characteristic of flexibility and can be easily adapted to working conditions such as narrow installation space; the FPC film is adopted to wrap the substrate 12, so that the insulation effect and the temperature resistance of the temperature sensor can be improved, the conditions that the substrate 12 is made of conductive metal such as copper sheets and short circuit is easy to occur when the substrate is exposed and mounted can be avoided, and the working reliability of the temperature sensor is improved; in addition, the copper substrate 12 has a good heat conductivity in addition to a flexible effect and being capable of serving as a conductive channel, and can significantly increase the temperature sensing area of the temperature sensor, thereby effectively improving the temperature sensing sensitivity and the detection accuracy of the temperature sensor; therefore, the temperature sensor has the advantages of simple structure, convenience in installation, high working reliability and the like.

Further preferably, as shown in fig. 1 and 2, the flexible temperature sensor further includes an electromagnetic shielding plate 14, the electromagnetic shielding plate 14 is a flexible plate and encloses the thermistor 11 in a shielding action area thereof, and the first FPC film 13 also encloses the electromagnetic shielding plate 14. The electromagnetic shield plate 14 can play a role in shielding electromagnetic interference, and can effectively improve the working reliability and detection precision of the thermistor 11. In one embodiment, the electromagnetic shielding plate 14 is disposed around the substrate 12 and around the substrate 12, and in the above-mentioned solution that the substrate 12 needs to be connected with the conducting wire 21, the electromagnetic shielding plate 14 is correspondingly provided with a notch to allow the electrical connection portion 121 of the substrate 12 to pass through (the electrical connection position is located on the electrical connection portion 121); optionally, the electromagnetic shielding plate 14 is made of a copper sheet, and since the substrate 12 is also made of a copper sheet, the electromagnetic shielding plate 14 is preferably arranged around the substrate 12 and has a lateral clearance gap with the substrate 12 to avoid a short circuit situation caused by contact between the two. The electromagnetic shielding plate 14 is preferably fixedly connected to the first FPC film 13, for example, by a thermal compression connection structure, so that the relative position between the electromagnetic shielding plate 14 and the substrate 12/thermistor 11 is stable, thereby ensuring the reliability of the operation.

Further optimizing the structure of the temperature sensor, as shown in fig. 1 and fig. 2, the flexible temperature sensor further includes a reinforcing plate 15, the reinforcing plate 15 is adhered to the first FPC film 13 and is located on the same side of the substrate 12 as the thermistor 11, and the reinforcing plate 15 is a ring-shaped plate and encloses the thermistor 11 in its inner ring. The reinforcing plate 15 is a hard plate, which can better protect the thermistor 11, prevent the situation that the welding spot of the thermistor 11 falls off to cause open circuit of a chip and the like due to stress and the like of the temperature sensor, and ensure the connection reliability when the temperature sensor is adhered to application places such as a battery and the like; in one embodiment, the reinforcing plate 15 is made of FR-4(FR-4 is a flame-retardant material, and a composite material prepared by epoxy resin, a filler and glass fiber is used), so that the flame retardance and the temperature resistance of the temperature sensor can be improved; in another embodiment, the reinforcing plate 15 is made of a hard metal plate, for example, an aluminum plate or an iron plate, and plays a role of protecting the thermistor 11, and also plays a role of enhancing heat conduction, so as to further increase the temperature sensing area of the temperature sensor, thereby effectively improving the temperature sensing sensitivity and detection accuracy of the temperature sensor, and particularly when the temperature sensor is mounted on the battery box cover of the battery pack, the temperature sensor and the battery cell have a certain distance therebetween, so that the temperature sensing lag caused by the distance can be compensated to a certain extent after the heat conduction is enhanced by the reinforcing plate 15.

Because the first FPC film 13 is fixedly connected to the substrate 12 by thermocompression or the like, when the reinforcing plate 15 is bonded to the first FPC film 13, the relative position between the reinforcing plate 15 and the substrate 12/thermistor 11 is stable, and the reinforcing function can be ensured. In another embodiment, the reinforcing plate 15 and the substrate 12 may be directly bonded, and then the first FPC film 13 may be used to cover both.

In addition, when the reinforcing plate 15 is made of a hard metal plate, and the reinforcing plate is bonded with the first FPC film 13 by using an insulating adhesive, the presence of the insulating adhesive can also avoid the occurrence of short circuit between the reinforcing plate 15 and the substrate 12 when the insulating property of the first FPC film 13 is reduced or fails.

Preferably, the electrical contact is located outside the stiffening action zone of the stiffening plate 15. It is understood that the reinforcement action region is defined by the projection range of the outer edge of the reinforcement plate 15 on the first FPC film 13, and the substrate 12 and the flexible wires 21, etc. outside the projection range are suitable for bending, facilitating the use of the temperature sensor; the electrical connection location of the flexible lead 21 is outside the reinforcement application area, facilitating connection between the flexible lead 21 and the substrate 12, as well as facilitating later maintenance.

Further optimizing the structure of the temperature sensor, as shown in fig. 1 and 2, electromagnetic shielding wires 22 are respectively disposed on both sides of the flexible wire 21 and between two wire bodies thereof, and each electromagnetic shielding wire 22 and the flexible wire 21 are disposed in the same plane. In one embodiment, the two wire bodies of the flexible conducting wire 21 are both strip-shaped conductive copper sheets; the electromagnetic shielding wire 22 is also made of a strip copper sheet. The electromagnetic shielding wire 22 can also play a role in shielding electromagnetic interference, so that the accuracy and reliability of signal transmission are ensured, and the working reliability and detection precision of the temperature sensor are further improved.

Further preferably, as shown in fig. 1, the flexible temperature sensor further includes a second FPC film 23, and the second FPC film 23 encloses the flexible conductive wires 21 and the electromagnetic shielding wires 22. Similarly, the flexible conductive wires 21 and the electromagnetic shielding wires 22 may be respectively and fixedly connected to the second FPC film 23 by thermal compression or the like. The FPC film is adopted to wrap the flexible conducting wire 21 and the electromagnetic shielding wire 22, so that the insulation effect and the temperature resistance of the temperature sensor can be further improved, and meanwhile, the working stability of the conducting circuit is guaranteed.

The structure of the temperature sensor has the characteristics of small volume and thin thickness, and specifically, the head thickness of the temperature sensor is about 1.0mm (the sum of the thicknesses of the substrate 12, the first FPC and the reinforcing plate 15), and the thickness of the lead 21 is about 0.2mm, so that the temperature sensor can be well adapted to a narrow installation space.

Example two

The embodiment of the invention provides a battery pack, which comprises a battery box and at least one group of battery modules arranged in the battery box, wherein the battery box comprises a box body and a box cover, and the battery pack also comprises a plurality of flexible temperature sensors provided by the first embodiment, and the flexible temperature sensors are attached to the surface of a battery core of a battery to be tested, or the flexible temperature sensors are attached to the box cover and positioned right above the battery to be tested.

For the mounting of the flexible temperature sensor, the first FPC film 13 is adopted to wrap the corresponding components, so that the first FPC film 13 is bonded to the corresponding position.

When the flexible temperature sensor is directly attached to the surface of the electric core of the battery to be detected, the structure of the temperature sensor enables the copper foil to rapidly conduct heat to the NTC chip, namely the NTC chip is separated from the surface of the battery by only one layer of film (0.05-0.15 mm), the requirement that the temperature sensing chip is as close as possible to the surface of the battery is met, and the detection accuracy of the temperature sensor and the following performance of the temperature sensor during temperature fluctuation are greatly improved.

When the flexible temperature sensor is attached to the box cover, the equipment layout in the battery box can be optimized, on one hand, the situation that each battery needs to be assembled after being attached with the temperature sensor is avoided, the production efficiency can be improved, the arrangement of the battery module is regular and fine, and the working performance of the battery pack is correspondingly improved; on the other hand, the arrangement and management of the temperature sensor can be facilitated, after the box cover is assembled, the distance between the thermistor 11 and the surface of the battery is close enough, and the accuracy and the reliability of a detection result can be guaranteed.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.