Battery temperature measuring device

Abstract

To provide a battery temperature measurement device capable of preventing a reduction in battery temperature measurement accuracy.SOLUTION: A battery temperature measurement device for measuring temperature of a battery is provided, the device comprising a temperature sensor having a chip thermistor mounted on a flexible printed circuit board, a heat collection plate provided between the temperature sensor and the battery, an elastic member for pushing the flexible printed circuit board at a position surrounding the chip thermistor to bring the temperature sensor into contact with the heat collection plate, and protrusions provided on a surface of the heat collection plate on a side to be in contact with the battery.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a battery temperature measurement device for measuring the temperature of a battery.

Background Art

[0002] Patent Document 1 discloses a structure for measuring the temperature of a battery by pressing a thermistor element mounting portion against the battery with a biasing member.

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] In the structure disclosed in Patent Document 1, there is a problem in that the contact area of the heat collecting plate with the battery is not stabilized due to warpage of the heat collecting plate (heat collection plate) in contact with the battery, the surface condition of the heat collecting plate and the battery, and foreign matter caught between the heat collecting plate and the battery, resulting in reduced measurement accuracy of the battery temperature.

[0005] The present disclosure has been made in view of the above problem, and an object of the present disclosure is to provide a battery temperature measurement device capable of suppressing a decrease in measurement accuracy of battery temperature.

Means for Solving the Problem

[0006] To solve the above problems, one aspect of the disclosed technology is a battery temperature measuring device for measuring the temperature of a battery, comprising: a temperature sensor on which a chip thermistor is mounted on a flexible printed circuit board; a heat collecting plate provided between the temperature sensor and the battery; an elastic member that biases the flexible printed circuit board at a position surrounding the chip thermistor and brings the temperature sensor into contact with the heat collecting plate; and a protrusion provided on the surface of the heat collecting plate on the side that contacts the battery. [Effects of the Invention]

[0007] According to the battery temperature measuring device of this disclosure, the contact area of ​​the heat collecting plate with the battery is stable, which suppresses a decrease in the accuracy of measuring the battery temperature. [Brief explanation of the drawing]

[0008] [Figure 1] This diagram illustrates the structure of the battery temperature measuring device according to this embodiment. [Figure 2] A schematic diagram illustrating a modified example of the structure of the battery temperature measuring device according to this embodiment. [Modes for carrying out the invention]

[0009] The battery temperature measuring device according to this disclosure is provided with a spherical projection on the surface of the heat collecting plate facing the battery, which is placed between the temperature sensor and the battery. This projection stabilizes the contact area between the heat collecting plate and the battery, thereby suppressing a decrease in the accuracy of battery temperature measurement. Hereinafter, one embodiment of this disclosure will be described in detail with reference to the drawings.

[0010] <Embodiment> [structure] Figure 1 is a schematic diagram illustrating a battery temperature measurement structure using a battery temperature measuring device 200 according to one embodiment of the present disclosure. The battery temperature measurement structure illustrated in Figure 1 includes a battery 100, a battery temperature measuring device 200, and a pressing plate 300.

[0011] The battery temperature measuring device 200 comprises a temperature sensor 210, a heat collecting plate 220, and an elastic member 230. The battery temperature measuring device 200 is pressed against the battery 100 with a predetermined load (N) by pressure applied from the outside (in the direction of the arrow in Figure 1) by a pressing plate 300.

[0012] The temperature sensor 210 is configured to measure the temperature of the battery 100. This temperature sensor 210 has a chip thermistor 211 mounted on a flexible printed circuit board (FPC) 212 as a sensor to measure the temperature of the battery 100.

[0013] The heat collector plate 220 is made of a material with high thermal conductivity and has a plate-like structure, for example. This heat collector plate 220 is installed to be inserted between the temperature sensor 210 and the battery 100, and plays the role of collecting the heat generated by the battery 100 and transferring it to the temperature sensor 210 (chip thermistor 211). In addition, the surface of the heat collector plate 220 on the side that contacts the battery 100 is provided with three spherical notches 220a with a spherical cap facing the battery 100. By making the protrusions 220a spherical notches, even if the heat collector plate 220 is tilted relative to the battery 100, it becomes easier to keep the contact area of ​​the heat collector plate 220 with the battery 100, that is, the contact area of ​​the protrusions 220a with the battery 100, constant. The closer the position of these protrusions 220a is to the mounting position of the chip thermistor 211, the better the responsiveness of heat transfer.

[0014] The number of protrusions 220a on the surface of the heat collector plate 220 that contacts the battery 100 is not limited to the three shown in Figure 1. For example, the number of protrusions 220a on the heat collector plate 220 may be just one (for example, directly below the chip thermistor 211), as shown in the modified example in Figure 2, or there may be two. It is possible to provide four or more protrusions 220a on the surface of the heat collector plate 220 that contacts the battery 100, but if the heat collector plate 220 is tilted relative to the battery 100, some protrusions 220a may not make contact, potentially resulting in an unstable (variable) contact area. Therefore, it is desirable to have three or fewer protrusions.

[0015] The elastic member 230 is a member with high elasticity. This elastic member 230 is provided so as to be in contact with the flexible printed circuit board 212 at a position that surrounds part or all of the chip thermistor 211 (i.e., a position where only the substrate is not mounted on the chip thermistor 211). Examples of the elastic member 230 include foamed rubber and foamed resin. Furthermore, this elastic member 230 can be a thermally insulating elastic member that combines high thermal insulation performance and high elasticity. Since the thermally insulating member does not conduct heat, it is possible to suppress the transfer of heat transmitted from the battery 100 via the heat collecting plate 220 to parts other than the temperature sensor 210. This makes it possible to measure the temperature of the battery 100 with high accuracy and high response while ensuring the safety of the battery 100.

[0016] The pressing plate 300 is configured to contact the battery temperature measuring device 200 at the end of the elastic member 230 that is opposite to the heat collecting plate 220 that contacts the battery 100. A plate-shaped member having a predetermined rigidity can be used for the pressing plate 300. This pressing plate 300 biases the flexible printed circuit board 212 via the elastic member 230 in order to bring the temperature sensor 210 into contact with the heat collecting plate 220 by external pressure.

[0017] Battery 100 is a battery (or battery cell) that requires temperature control to ensure safety. Examples of this battery 100 include rechargeable batteries such as lithium-ion batteries.

[0018] <Effects and Actions> As described above, according to the battery temperature measuring structure using the battery temperature measuring device 200 according to one embodiment of the present disclosure, a temperature sensor 210, on which a chip thermistor 211 is mounted on a flexible printed circuit board 212, is biased by an elastic member 230 on the surface of the flexible printed circuit board 212 that is outside the vicinity of the chip thermistor 211. Due to this pressing structure of the temperature sensor 210 by the elastic member 230, the temperature sensor 210 comes into contact with the heat collecting plate 220, and further the heat collecting plate 220 comes into contact with the battery 100.

[0019] By providing the convex portion 220a on the surface of the heat collecting plate 220 on the side in contact with the battery 100, it is possible to prevent the heat collecting plate 220, against which the temperature sensor 210 is abutted, from unevenly contacting the battery 100 due to factors such as elastic variation of the elastic member 230 and variation in pressing pressure from the pressing plate 300. Furthermore, forming the convex portion 220a into a spherical segment shape stabilizes the contact area between the heat collecting plate 220 and the battery 100, thereby suppressing a decrease in the measurement accuracy of the temperature of the battery 100.

[0020] By forming the elastic member 230 as a heat-insulating elastic member, transmission of heat transferred from the battery 100 via the heat collecting plate 220 to portions other than the temperature sensor 210 can be suppressed. This makes it possible to measure the temperature of the battery 100 with high accuracy and high responsiveness while ensuring the safety of the battery 100. Furthermore, the battery temperature measuring device 200 according to the present embodiment can be realized at low cost. [Industrial Applicability]

[0021] The battery temperature measuring device of the present disclosure can be used, for example, when measuring the temperature of a waterproof battery (battery pack). [Description of Reference Numerals]

[0022] 100 Battery 200 Battery temperature measuring device 210 Temperature sensor 211 Chip thermistor 212 Flexible printed circuit board 220 Heat collecting plate 220a Convex portion 230 Elastic member 300 Pressing plate

Claims

1. A battery temperature measuring device for measuring the temperature of a battery, A temperature sensor with a chip thermistor mounted on a flexible printed circuit board, A heat collecting plate is provided between the temperature sensor and the battery, An elastic member biases the flexible printed circuit board at a position surrounding the chip thermistor and brings the temperature sensor into contact with the heat collecting plate, The heat collector plate has three protrusions on its surface that contacts the battery, which are positioned so that it remains in contact with the battery even when the heat collector plate is tilted relative to the battery. Battery temperature measuring device.

2. The aforementioned protrusion is shaped like a ball with a notch facing the battery. The battery temperature measuring device according to claim 1.

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