Abnormal temperature detection system for battery cell

Abstract

Disclosed is an abnormal temperature detection system capable of further reducing the amount of temperature information processing for the entire battery cell and further improving stability, the abnormal temperature detection system comprising: a plurality of light guide plates which overlap at least a partial region of one surface of the battery cell in one direction and into which electromagnetic waves radiated from the battery cell are incident, changing the path of the electromagnetic wave; an image sensor that overlaps at least a partial region of each of the plurality of light guide plates in the one direction, detects the electromagnetic waves reflected from the light guide plates, and outputs temperature spectrum information on one surface of the battery cell on the basis thereof; and a calculation unit that determines that an abnormal temperature is detected in the battery cell when the temperature of one surface of the battery cell deviates from a preset temperature range.

Description

Technical Field

[0001] The present invention relates to an abnormal temperature detection system for a battery cell, and more particularly, to an abnormal temperature detection system capable of further reducing the amount of temperature information processing for the entire battery cell and further improving stability. Background Art

[0002] Batteries for electric vehicles generally have a structure in which multiple battery cells are configured. In order to prevent battery fires and ensure the stability of electric vehicles, it is necessary to monitor the temperature of multiple battery cells and detect abnormal temperatures when they occur.

[0003] To this end, a light guide plate and a light receiving sensor can be set on one side of the battery cell to receive electromagnetic waves emitted from the battery cell and measure the temperature based on this. However, this type of temperature measurement device is composed of multiple light guide plates to avoid overlapping with high-temperature parts such as connectors set on the battery cell.

[0004] Generally, in a multiple light guide plate structure, each light guide plate is combined with an independent image sensor, which increases the amount of temperature information processing for the entire battery cell and increases the possibility of errors in temperature measurement results.

[0005] Therefore, it is possible to consider developing a temperature detection system that can further reduce the amount of temperature information processing for the entire battery cell and further improve stability.

[0006] Korean Patent Publication No. 10-2021-0052009 discloses a diagnostic device and a diagnostic method for a battery temperature sensor. Specifically, a device and a method for diagnosing a failure of each of a plurality of battery temperature sensors separately arranged in a plurality of areas within a battery pack are disclosed.

[0007] However, this type of battery temperature sensor is based on the premise of providing a plurality of battery temperature sensors. Therefore, the amount of temperature information to be processed for the entire battery increases, and there is a high possibility that errors will occur in the processing results.

[0008] Korean Patent Publication No. 10-2022-0073561 discloses a temperature sensor array and a battery temperature measuring device including the same. Specifically, the invention discloses a temperature sensor array that measures the temperatures of two or more different positions individually and a battery temperature measuring device including the same.

[0009] However, this type of battery temperature measuring device measures the temperature of each position individually. That is, a plurality of sensors are required. Therefore, there is an instability problem caused by an increase in the amount of temperature information to be processed. Furthermore, no specific solution to this problem is disclosed.

[0010] Korean Patent Publication No. 10-2021-0052009 (2021.05.10.)

[0011] Korean Patent Publication No. 10-2022-0073561 (2022.06.03.) Summary of the invention

[0012] Problem that the invention aims to solve

[0013] An object of the present invention is to provide an abnormal temperature detection system for a battery cell that can further improve the stability of the operation of the entire battery cell.

[0014] Another object of the present invention is to provide an abnormal temperature detection system for a battery cell that can be more easily applied to a plurality of light guide plates formed in various arrangements.

[0015] Another object of the present invention is to provide an abnormal temperature detection system for a battery cell that can further reduce manufacturing costs and processes.

[0016] The problems that the present invention intends to solve are not limited to the problems mentioned above, and other problems not mentioned can be clearly understood by ordinary technicians in the technical field to which the present invention belongs through the following description.

[0017] Means used to solve problems

[0018] In order to achieve the above-mentioned purpose, an abnormal temperature detection system of an embodiment of the present invention includes: a plurality of light guide plates, overlapping with at least a portion of an area on one side of a battery cell in one direction, irradiating electromagnetic waves radiated from the battery cell and changing the path of the electromagnetic waves; an image sensor, overlapping with at least a portion of an area of ​​each of the plurality of light guide plates in the one direction, detecting the electromagnetic waves reflected from the light guide plates, and outputting temperature spectrum information of one side of the battery cell based on the image sensor; and a computing unit, which determines that abnormal temperature is detected in the battery cell when the temperature of one side of the battery cell deviates from a preset temperature range.

[0019] In addition, the electromagnetic waves may be infrared rays.

[0020] In addition, the plurality of light guide plates may be arranged side by side along another direction intersecting the one direction.

[0021] In addition, a lead-out portion is formed on one side of at least one light guide plate among the plurality of light guide plates, and one end of the lead-out portion may overlap with the image sensor in the one direction.

[0022] In addition, a coating layer of a material for shielding electromagnetic waves may be formed on the outer peripheral surface of the lead-out portion.

[0023] In addition, in the plurality of light guide plates, the plurality of rows may be arranged in parallel along the other direction to form a matrix structure.

[0024] In addition, a plurality of the light guide plates may be arranged in parallel along the one direction.

[0025] In addition, the plurality of light guide plates may not overlap with connectors disposed on the battery unit in the one direction.

[0026] Furthermore, when an abnormal temperature is detected in the battery cell, the calculation unit may estimate a location where the abnormal temperature occurs based on the temperature spectrum information.

[0027] In addition, the present invention provides an abnormal temperature detection system as another embodiment of the abnormal temperature detection system, which includes: a plurality of light guide plates overlapping with at least a portion of a surface of a battery cell in one direction, irradiating electromagnetic waves radiated from the battery cell and changing the path of the electromagnetic waves; an image sensor overlapping with at least a portion of each of the plurality of light guide plates in another direction intersecting the one direction, detecting the electromagnetic waves reflected from the light guide plates, and outputting temperature spectrum information of a surface of the battery cell based on the detected electromagnetic waves; and a computing unit, which determines that abnormal temperature is detected in the battery cell when the temperature of a surface of the battery cell deviates from a preset temperature range, and the plurality of light guide plates are arranged in parallel along the one direction.

[0028] In addition, the electromagnetic waves may be infrared rays.

[0029] In addition, a filling material may be disposed between two adjacent light guide plates among the plurality of light guide plates so as to be separated from each other.

[0030] In addition, the plurality of light guide plates may overlap with the plurality of battery cells in the one direction, and any one of the plurality of battery cells may be arranged between two adjacent light guide plates.

[0031] In addition, the plurality of light guide plates may be arranged so as not to overlap with connectors disposed on the battery unit in the one direction.

[0032] Furthermore, when an abnormal temperature is detected in the battery cell, the calculation unit may estimate a location where the abnormal temperature occurs based on the temperature spectrum information.

[0033] Effects of the Invention

[0034] Among various effects of the present invention, the effects that can be obtained by the above-mentioned solution are as follows.

[0035] First, an abnormal temperature detection system of an embodiment of the present invention includes a plurality of light guide plates, an image sensor, and a computing unit. The plurality of light guide plates overlap at least a portion of a battery cell in one direction. The image sensor detects electromagnetic waves reflected from the light guide plates and outputs temperature spectrum information of the battery cell based on the electromagnetic waves. At this time, the image sensor and the plurality of light guide plates overlap in a certain direction. The computing unit determines whether an abnormal temperature of the battery cell occurs based on the output result.

[0036] Therefore, electromagnetic waves reflected from multiple light guide plates can be received by one image sensor. This can further reduce the amount of temperature information processing for multiple light guide plates and reduce the possibility of errors in measurement results. As a result, the stability of the operation of the entire battery unit can be further improved.

[0037] In addition, the image sensors may be arranged in all directions of up and down, left and right, and front and back of the plurality of light guide plates according to circumstances.

[0038] Therefore, the image sensor can more easily receive electromagnetic waves reflected from a plurality of light guide plates formed in various arrangements. Therefore, the applicability and usability of the abnormal temperature detection system can be further improved.

[0039] In addition, the image sensor can detect abnormal temperature of the battery cell with an area smaller than the area of ​​the entire light guide plate, and only one image sensor can detect electromagnetic waves reflected from a plurality of light guide plates.

[0040] Therefore, the number of image sensors can be further reduced, the overall structure can be further simplified, and further, the manufacturing cost and process can be further reduced.

[0041] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by a person having ordinary knowledge in the technical field to which the present invention belongs based on the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 1 is a schematic diagram showing an abnormal temperature detection system according to an embodiment of the present invention.

[0043] Figure 2 It is shown Figure 1 A side sectional view of a temperature measuring unit provided in an abnormal temperature detection system.

[0044] Figure 3 It is shown Figure 2 An exploded perspective view of the temperature measuring portion.

[0045] Figure 4 It shows the injection into Figure 2 A side cross-sectional view of the path of the electromagnetic wave of the temperature measuring part.

[0046] Figure 5 It is shown Figure 1 Conceptual diagram of an image sensor provided in an abnormal temperature detection system.

[0047] Figure 6 It is shown Figure 5 A front cross-sectional view of an image sensor.

[0048] Figures 7 and 8 Shown with Figure 5 Conceptual diagram of image sensors according to various embodiments.

[0049] Fig. 9 is shown with Figure 5 Conceptual diagram of the temperature distribution of the light guide plate combined with the image sensor and the temperature spectrum output from the image sensor.

[0050] Figure 10 to Figure 11 1 is a conceptual diagram showing an image sensor provided in an abnormal temperature detection system according to another embodiment of the present invention.

[0051] Fig.12 is with Fig.10 Conceptual diagram of the temperature distribution of the light guide plate combined with the image sensor and the temperature spectrum output from the image sensor. DETAILED DESCRIPTION

[0052] Hereinafter, the abnormal temperature detection system 1 according to the embodiment of the present invention will be described in more detail with reference to the drawings.

[0053] In the following description, in order to clarify the features of the present invention, the description of some components may be omitted.

[0054] In this specification, even in different embodiments, the same components are denoted by the same reference numerals, and repeated description thereof is omitted.

[0055] The drawings are only used to help understand the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited to the drawings.

[0056] Unless the context clearly indicates otherwise, a singular expression includes the plural expression.

[0057] Below, refer to Figures 1 to 9 An abnormal temperature detection system 1 according to an embodiment of the present invention will be described.

[0058] The abnormal temperature detection system 1 according to the embodiment of the present invention is combined with the battery unit 2 to determine whether an abnormal temperature occurs in the battery unit 2 .

[0059] In one embodiment, the abnormal temperature detection system 1 may be combined with the electric vehicle battery unit 2. In another embodiment, the abnormal temperature detection system 1 may be combined with a lithium-ion battery that can charge and discharge electric energy.

[0060] In the illustrated embodiment, the abnormal temperature detection system 1 includes a temperature measuring unit 11 , an image sensor 12 , and a computing unit 14 .

[0061] The temperature measuring unit 11 overlaps at least a portion of one surface of the battery cell 2 in one direction to measure the temperature of the battery cell 2. In one embodiment, the temperature measuring unit 11 may be arranged to overlap the top surface of the battery cell 2 in the vertical direction.

[0062] The temperature measuring unit 11 receives electromagnetic waves W having a specific wavelength of heat energy emitted from at least one battery cell 2 and measures the temperature based on the electromagnetic waves W. In one embodiment, the electromagnetic waves W received by the temperature measuring unit 11 may be infrared rays.

[0063] The temperature measuring unit 11 guides the path of the electromagnetic wave W using the light guide plate 114 when receiving the electromagnetic wave W. However, part of the electromagnetic wave W incident on the light guide plate 114 is guided to a pre-designed path, and the remaining part deviates from the pre-designed path and is reflected in another direction.

[0064] The image sensor 12 detects the electromagnetic waves W reflected from the plurality of light guide plates 114 , and outputs temperature spectrum information of one surface of the battery cell 2 based on the detected electromagnetic waves W.

[0065] The image sensor 12 overlaps at least a portion of each of the plurality of light guide plates 114 in a certain direction. Therefore, the electromagnetic waves W reflected from the plurality of light guide plates 114 can be received by one image sensor 12.

[0066] This can further reduce the amount of temperature information processing for the plurality of light guide plates 114 and reduce the possibility of errors in the measurement results. As a result, the operating stability of the entire battery unit 2 can be further improved.

[0067] The image sensor 12 can be arranged in all directions of up, down, left, right, front and back relative to the plurality of light guide plates 114. Therefore, the image sensor 12 can more easily receive the electromagnetic waves W reflected from the plurality of light guide plates 114 formed in various arrangements. Therefore, the applicability and usability of the abnormal temperature detection system 1 can be further improved.

[0068] In addition, the image sensor 12 can detect the abnormal temperature of the battery cell 2 with an area smaller than that of the light guide plate 114. Therefore, the overall structure of the abnormal temperature detection system 1 can be further simplified. Furthermore, the manufacturing cost and process can be further reduced.

[0069] The temperature spectrum information output from the image sensor 12 is transmitted to the calculation unit 14 .

[0070] When the temperature of one surface of the battery cell 2 deviates from a preset temperature range, the calculation unit 14 determines that an abnormal temperature has been detected in the battery cell 2 .

[0071] In one embodiment, the calculation unit 14 may determine that an abnormal temperature is detected in the battery cell 2 when the temperature of one surface of the battery cell 2 is 65° C. or higher.

[0072] When abnormal temperature is detected, the calculation unit 14 can estimate the position where the abnormal temperature occurs based on the temperature spectrum information. For example, when abnormal temperature is detected, the calculation unit 14 can estimate the position of the light guide plate 114 where the abnormal temperature is detected among the plurality of light guide plates 114 .

[0073] Below, refer to Figures 2 to 4 , the temperature measuring unit 11 will be described in detail.

[0074] As described above, the temperature measuring portion 11 overlaps in one direction with at least a portion of one surface of the battery cell 2 , so that the electromagnetic wave W radiated from the battery cell 2 can enter the temperature measuring portion 11 .

[0075] In the illustrated embodiment, the battery cell 2 may include an amplifying light source 21 that amplifies electromagnetic waves W having a wavelength inherent to temperature generated by radiation and emits them into the light guide plate 114. The amplifying light source 21 may emit infrared light having a wavelength in the infrared region.

[0076] In addition, the battery cell 2 may include a layer 22 formed by coating a thermosensitive pigment on a surface facing the temperature measuring unit 11. The thermosensitive pigment may be a pigment whose color changes with temperature.

[0077] The layer 22 may be formed by coating a heat-sensitive pigment that changes color to a predetermined color when the battery cell 2 exceeds a preset reference temperature.

[0078] In the illustrated embodiment, the temperature measuring unit 11 includes a protective film 111 , a prism sheet 112 , a diffusion sheet 113 , a light guide plate 114 , an optical pattern portion 115 , a reflective member 116 , a light receiving sensor 117 , and a light receiving cover 118 .

[0079] The protective film 111 can play a role in protecting the light collecting portion such as the light guide plate 114. In addition, the protective film 111 can play a role in preventing the battery cell 2 and the temperature measuring portion 11 from being damaged due to contact.

[0080] In one embodiment, the protective film 111 may be formed of an acrylic transparent resin. However, the protective film 111 is not limited to the above material, and may be formed of various materials that can protect the light-collecting portion.

[0081] The prism sheet 112 is a sheet for improving light efficiency, and can change the front light incident from the battery cell 2 into side light.

[0082] The diffusion sheet 113 may rescatter the light incident toward the light guide plate 114 so that the light may be uniformly incident.

[0083] When the electromagnetic wave W radiated from at least one battery cell 2 enters the light guide plate 114, the light guide plate 114 may change the path of the electromagnetic wave W to the other side and emit it. For example, the light guide plate 114 may change the path of the electromagnetic wave W that is emitted from the battery cell 2 in a substantially vertical direction. In one embodiment, the electromagnetic wave W that enters the light guide plate 114 may be infrared rays.

[0084] The light guide plates 114 of the embodiment of the present invention are provided in plurality. The plurality of light guide plates 114 overlap at least a portion of one side of the battery cell 2 in one direction. However, the light guide plates 114 are configured so as not to overlap the connector provided on the battery cell 2 in the said direction. A detailed description of this will be given later.

[0085] In one embodiment, the light guide plate 114 may be formed of a light-transmitting material having a certain refractive index.

[0086] The light guide plate 114 may be combined with a Fresnel lens 114 a .

[0087] The Fresnel lens 114 a is a kind of condensing lens and plays a role of condensing light like a convex lens. The Fresnel lens 114 a can concentrate the electromagnetic waves W emitted from the battery cell 2 to one point. That is, the concentrated electromagnetic waves W can be incident on the light guide plate 114 .

[0088] In one embodiment, the length and width of the Fresnel lens 114a may be greater than the light guide plate 114. In the embodiment, when the light guide plate 114 is formed to have an area smaller than the top surface of the battery cell 2, the Fresnel lens 114a covers the top surface of the battery cell 2 to concentrate the electromagnetic waves W emitted from the battery cell 2, and the concentrated electromagnetic waves W can be incident on the light guide plate 114.

[0089] In addition, a reflective member 116 is coupled to one side of the light guide plate 114 .

[0090] The reflective member 116 reflects the electromagnetic wave W incident on the light guide plate 114 , thereby preventing the electromagnetic wave W incident on the light guide plate 114 from deviating from a pre-designed path and being lost.

[0091] The reflective member 116 may be configured in a film form, but is not limited thereto.

[0092] In addition, the reflective member 116 may include an optical pattern part 115 .

[0093] The optical pattern part 115 may diffuse or reflect the electromagnetic waves W incident from the battery cell 2 to prevent light concentration. A pattern that performs light reflection, light diffusion, light scattering, or light shielding may be formed on the optical pattern part 115 .

[0094] The light receiving sensor 117 receives the focused electromagnetic wave W. The light guide plate 114 guides the electromagnetic wave W incident on the light guide plate 114 toward the light receiving sensor 117 .

[0095] In the illustrated embodiment, the light receiving sensor 117 is disposed adjacent to a side surface of the light guide plate 114 .

[0096] In one embodiment, the light receiving sensor 117 may be an infrared sensor. The infrared sensor may refer to a sensor that detects physical quantities such as temperature using infrared rays and converts them into electrical quantities that can be processed as signals.

[0097] The side surface of the light receiving sensor 117 may be supported by a light receiving sensor supporting portion 117 a .

[0098] A plurality of light receiving sensors 117 may be provided. The plurality of light receiving sensors 117 may be arranged adjacent to one side of the light guide plate 114 at a predetermined interval. The purpose is to sufficiently receive the electromagnetic wave W when the path of the electromagnetic wave W emitted from the plurality of battery cells 2 is changed to one side of the light guide plate 114 and is concentrated.

[0099] In the illustrated embodiment, the light receiving sensor 117 is arranged to be surrounded by a light receiving cover 118 .

[0100] The light receiving cover 118 is located radially outside the light receiving sensor 117 so that wavelengths other than the electromagnetic wave W passing through the light guide plate 114 are not incident on the light receiving sensor 117 .

[0101] In the illustrated embodiment, the light receiving cover 118 is formed into a dome structure surrounding the light receiving sensor 117. However, the light receiving cover 118 is not limited to the illustrated structure, and may be formed into various structures capable of shielding electromagnetic waves W incident on a path other than the path through the light guide plate 114.

[0102] In one embodiment, the light receiving cover 118 may be formed of a material that shields electromagnetic waves W.

[0103] Figure 4 The path of the electromagnetic wave W emitted from the battery cell 2 and incident on the temperature measuring unit 11 is shown.

[0104] Most of the electromagnetic wave W incident on the light guide plate 114 is guided to the side and travels toward the light receiving sensor 117 (see the solid arrow).

[0105] However, part of the electromagnetic wave W incident on the light guide plate 114 is reflected by the optical pattern portion 115 or the reflective member 116 and travels toward the incident surface (see the dotted arrow). That is, part of the electromagnetic wave W is not guided to the light receiving sensor 117 but travels in another direction and is lost.

[0106] As mentioned above, the image sensor 12 may overlap with the light guide plate 114 in a certain direction, receive the lost electromagnetic wave W, and output temperature spectrum information based on the received electromagnetic wave W.

[0107] Below, refer to Figures 5 to 9 The image sensor 12 according to an embodiment of the present invention will be described in more detail.

[0108] exist Figures 5 and 6 In the illustrated embodiment, the plurality of light guide plates 114 overlap at least a portion of one surface of the battery cell 2 in the vertical direction. However, two adjacent light guide plates 114 are arranged with a certain interval therebetween.

[0109] In the plurality of light guide plates 114, a plurality of rows are arranged side by side in the left-right or front-back direction to form a matrix structure. However, the arrangement structure of the plurality of light guide plates 114 is not limited to the structure shown in the figure, and various structures may be used.

[0110] In addition, the plurality of light guide plates 114 are arranged so as not to overlap with the high temperature portion H in the vertical direction. The high temperature portion H is provided with a cable connection portion (not shown) of the battery unit 2, a connector (not shown), etc., and is always kept at a high temperature, and is preferably excluded from the temperature monitoring object. For this purpose, a plurality of light guide plates 114 are arranged, and two adjacent light guide plates 114 are arranged at a certain interval so that each light guide plate 114 does not overlap with the high temperature portion H.

[0111] exist Figure 7 In the illustrated embodiment, a lead-out portion 119 is formed on one side of the light guide plate 114 .

[0112] The lead portion 119 is formed on one side of at least one of the plurality of light guide plates 114 and extends toward the image sensor 12. In addition, one end of the lead portion 119 overlaps with the image sensor 12 in a certain direction.

[0113] In one embodiment, a coating layer of a material for shielding the electromagnetic wave W may be formed on the outer peripheral surface of the lead-out portion 119 .

[0114] exist Figure 8In the illustrated embodiment, the plurality of light guide plates 114 are arranged in parallel in the vertical direction. At this time, at least a portion of the light guide plate 114 overlaps with the image sensor 12 in the vertical direction. That is, the image sensor 12 can receive electromagnetic waves W reflected from the plurality of light guide plates 114 in the vertical direction. The subsequent process has been described above and is therefore omitted.

[0115] Below, refer to Fig. 9 The abnormal temperature detection process when abnormal temperature occurs in the battery cell 2 will be described.

[0116] Fig. 9 (a) and Fig. 9 (b) shows the temperature distribution of the light guide plate 114 and the temperature spectrum information output from the image sensor 12 when abnormal temperature occurs in each battery cell 2.

[0117] As mentioned above, the image sensor 12 overlaps with the plurality of light guide plates 114 and the battery unit 2 in one direction.

[0118] When an electromagnetic wave W corresponding to an abnormal temperature is incident on any one of the plurality of light guide plates 114, for example, the light guide plate 114 on the upper left side in the illustrated embodiment (see Fig. 9 (a)), the image sensor 12 outputs a temperature spectrum showing abnormal temperature in the area where the light guide plate 114 and the image sensor 12 overlap (refer to Fig. 9 (b)).

[0119] The manager can detect the occurrence of abnormal temperature in the battery cell 2 through the output temperature spectrum and estimate the location where the abnormal temperature occurs.

[0120] The abnormal temperature detection system 1 according to one embodiment of the present invention has been described above. Figures 10 to 12 An abnormal temperature detection system 1 according to another embodiment of the present invention will be described.

[0121] The abnormal temperature detection system 1 of this embodiment is similar in structure and function to the abnormal temperature detection system 1 of the above-mentioned embodiment. However, the abnormal temperature detection system 1 of this embodiment is different from the abnormal temperature detection system 1 of the above-mentioned embodiment in that the image sensor 12 overlaps with the light guide plate 114 in a direction different from the arrangement direction of the battery cell 2 and the light guide plate 114. The description repeated with the abnormal temperature detection system 1 of the above-mentioned embodiment is omitted below, and the abnormal temperature detection system 1 of this embodiment is described mainly with the difference as the center.

[0122] The abnormal temperature detection system 1 of the present embodiment includes a temperature measuring unit 11 , an image sensor 12 , a filling material 13 , and a computing unit 14 .

[0123] The temperature measuring unit 11 and the computing unit 14 of this embodiment are respectively identical in structure and function to the temperature measuring unit 11 and the computing unit 14 of the above-mentioned embodiment, and therefore, their description will be omitted.

[0124] The image sensor 12 of this embodiment overlaps the light guide plate 114 in a direction different from the arrangement direction of the battery cells 2 and the light guide plate 114. In the illustrated embodiment, the battery cells 2 and the light guide plate 114 are arranged in parallel in the vertical direction, whereas the image sensor 12 is arranged to overlap the light guide plate 114 in the horizontal direction.

[0125] However, similar to the image sensor 12 in the above-mentioned embodiment, the image sensor 12 and the plurality of light guide plates 114 overlap in one direction.

[0126] In this embodiment, a plurality of light guide plates 114 are provided and arranged in a direction parallel to the arrangement direction of the battery cells 2. That is, the plurality of light guide plates 114 overlap in a direction parallel to the arrangement direction of the battery cells 2. At this time, any one of the plurality of battery cells 2 is arranged between two adjacent light guide plates 114.

[0127] In one embodiment, a filling material 13 may be disposed between two adjacent light guide plates 114 (see Fig.11 ).

[0128] The filler material 13 can separate two adjacent light guide plates 114 from each other. When the light guide plates 114 are usually formed thin and stacked in multiple layers, the output is likely to be low pixel, so the above structure is configured to improve the resolution. That is, in the case of detecting abnormal temperature, it is easier to grasp the abnormal temperature location.

[0129] exist Fig.11 In the illustrated embodiment, a lead-out portion 119 is formed on a side of each light guide plate 114 facing the image sensor 12. In the illustrated embodiment, the filling material 13 is disposed between two adjacent lead-out portions 119.

[0130] In one embodiment, the filling material 13 may be formed of an acrylic material.

[0131] Below, refer to Fig.12 The abnormal temperature detection process when the abnormal temperature of the battery cell 2 occurs will be described.

[0132] Fig.12 (a) and Fig.12 (b) shows the temperature distribution of the light guide plate 114 and the temperature spectrum information output from the image sensor 12 when abnormal temperature occurs in the battery cell 2 .

[0133] As described above, the image sensor 12 overlaps with the plurality of light guide plates 114 in a direction different from the arrangement direction of the light guide plates 114 .

[0134] When an electromagnetic wave W corresponding to an abnormal temperature is incident on one of the plurality of light guide plates 114, for example, the second light guide plate 114 from the top in the illustrated embodiment (see Fig.12 (a)), the image sensor 12 outputs a temperature spectrum showing abnormal temperature in the area where the light guide plate 114 and the image sensor 12 overlap (refer to Fig.12 (b)).

[0135] The manager can detect the occurrence of abnormal temperature of the battery cell 2 through the output temperature spectrum and estimate the occurrence location.

[0136] As mentioned above, although the preferred embodiment of the present invention was described with reference to the above, the present invention is not limited to the configuration of the described embodiment.

[0137] In addition, the present invention can be variously modified and changed by those skilled in the art without departing from the spirit and scope of the present invention described in the following claims.

[0138] Furthermore, the embodiments may be constituted by selectively combining all or part of the embodiments to form various modifications.

[0139] 1: Abnormal temperature detection system 11: Temperature measurement unit

[0140] 111: Protective film 112: Prism sheet

[0141] 113: Diffuser 114: Light guide plate

[0142] 114a: Fresnel lens 115: Optical pattern section

[0143] 116: Reflection member 117: Light receiving sensor

[0144] 117a: light receiving sensor support part 118: light receiving cover

[0145] 119: Lead-out section 12: Image sensor

[0146] 13: Filling material 14: Calculation unit

[0147] 2: Battery unit 21: Amplify the light source

[0148] 22: Layer W: Electromagnetic waves

[0149] H: High temperature part.

Claims

1. An abnormal temperature detection system, wherein: include: A plurality of light guide plates overlap at least a portion of one side of the battery cell in one direction, and irradiate the electromagnetic waves radiated from the battery cell to change the paths of the electromagnetic waves; an image sensor, overlapping at least a portion of each of the plurality of light guide plates in the one direction, detecting the electromagnetic wave reflected from the light guide plate, and outputting temperature spectrum information of one side of the battery cell based on the electromagnetic wave; as well as The calculation unit determines that an abnormal temperature is detected in the battery cell when the temperature of one surface of the battery cell deviates from a preset temperature range.

2. The abnormal temperature detection system according to claim 1, wherein: The electromagnetic waves are infrared rays.

3. The abnormal temperature detection system according to claim 1, wherein: The plurality of light guide plates are arranged side by side along another direction intersecting the one direction.

4. The abnormal temperature detection system according to claim 3, wherein: A lead-out portion is formed on one side of at least one light guide plate among the plurality of light guide plates, and one end of the lead-out portion overlaps with the image sensor in the one direction.

5. The abnormal temperature detection system according to claim 4, wherein: A coating layer of a material for shielding electromagnetic waves is formed on an outer peripheral surface of the lead-out portion.

6. The abnormal temperature detection system according to claim 3, wherein: In the plurality of light guide plates, a plurality of rows are arranged in parallel along the other direction and configured in a matrix structure.

7. The abnormal temperature detection system according to claim 1, wherein: A plurality of the light guide plates are arranged in parallel along the one direction.

8. The abnormal temperature detection system according to claim 1, wherein: The plurality of light guide plates are arranged so as not to overlap with the connectors provided on the battery unit in the one direction.

9. The abnormal temperature detection system according to claim 1, wherein: When the abnormal temperature is detected in the battery cell, the calculation unit estimates a location where the abnormal temperature occurs based on the temperature spectrum information.

10. An abnormal temperature detection system, wherein: include: A plurality of light guide plates overlap at least a portion of one side of the battery cell in one direction, and irradiate the electromagnetic waves radiated from the battery cell to change the paths of the electromagnetic waves; an image sensor, overlapping at least a portion of each of the plurality of light guide plates in another direction intersecting the one direction, detecting the electromagnetic wave reflected from the light guide plate, and outputting temperature spectrum information of one side of the battery cell based on the electromagnetic wave; as well as The calculation unit determines that an abnormal temperature is detected in the battery cell when the temperature of one surface of the battery cell deviates from a preset temperature range, A plurality of the light guide plates are arranged in parallel along the one direction.

11. The abnormal temperature detection system according to claim 10, wherein: The electromagnetic waves are infrared rays.

12. The abnormal temperature detection system according to claim 10, wherein: A filling material is arranged between two adjacent light guide plates among the plurality of light guide plates so as to be separated from each other.

13. The abnormal temperature detection system according to claim 10, wherein: The plurality of light guide plates and the plurality of battery cells overlap in the one direction, and any one of the plurality of battery cells is arranged between two adjacent light guide plates.

14. The abnormal temperature detection system according to claim 10, wherein: The plurality of light guide plates are arranged so as not to overlap with the connectors disposed on the battery unit in the one direction.

15. The abnormal temperature detection system according to claim 10, wherein: When the abnormal temperature is detected in the battery cell, the calculation unit estimates a location where the abnormal temperature occurs based on the temperature spectrum information.

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