WO2015049971A1 - Temperature abnormality detecting apparatus - Google Patents

Temperature abnormality detecting apparatus Download PDF

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Publication number
WO2015049971A1
WO2015049971A1 PCT/JP2014/074179 JP2014074179W WO2015049971A1 WO 2015049971 A1 WO2015049971 A1 WO 2015049971A1 JP 2014074179 W JP2014074179 W JP 2014074179W WO 2015049971 A1 WO2015049971 A1 WO 2015049971A1
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WO
WIPO (PCT)
Prior art keywords
temperature
battery cell
battery
coupled member
coupled
Prior art date
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PCT/JP2014/074179
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French (fr)
Japanese (ja)
Inventor
英史 大石
加藤　崇行
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株式会社 豊田自動織機
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Publication of WO2015049971A1 publication Critical patent/WO2015049971A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a temperature abnormality detection device that detects a temperature abnormality of a battery cell.
  • Patent Document 1 describes a charging device for preventing such a failure due to a temperature abnormality of a battery cell.
  • the charging device detects the temperature of the secondary battery (battery cell) and the outside air temperature, detects the temperature abnormality of the secondary battery based on the temperature difference between the temperature of the secondary battery and the outside air temperature, When the battery temperature abnormality is detected, charging of the secondary battery is stopped.
  • the charging device disclosed in Patent Document 1 may determine that an abnormality has occurred in the secondary battery even though no abnormality has occurred in the secondary battery.
  • the objective of this invention is providing the temperature abnormality detection apparatus which can suppress the erroneous detection of the temperature abnormality in a battery cell.
  • One aspect of the present invention is a temperature abnormality detection device that detects a temperature abnormality of a battery cell that is thermally coupled to a member to be coupled, and the temperature abnormality detection device detects the temperature of the member to be coupled. When the temperature difference between the temperature sensor for the coupling member, the temperature sensor for the battery cell that detects the temperature of the battery cell, and the temperature of the battery cell and the temperature of the coupled member is equal to or greater than a threshold value, the temperature of the battery cell And a control device that determines that there is an abnormality.
  • the temperature abnormality detection device is configured to determine a temperature abnormality of the battery cell based on a temperature difference between the temperature of the battery cell and the temperature of the coupled member.
  • a temperature difference between the temperature of the battery cell and the temperature of the coupled member is excessively large. Hard to become. Therefore, the temperature abnormality detection device according to one aspect of the present invention can suppress erroneous detection of temperature abnormality in the battery cell even when the outside air temperature changes rapidly.
  • the schematic side view of a forklift The perspective view of a battery pack.
  • the block diagram of a temperature abnormality detection apparatus The flowchart which shows the temperature abnormality detection routine which a control apparatus performs. The figure for demonstrating the effect
  • the temperature abnormality detection device can be provided in a battery pack mounted on an industrial vehicle.
  • “front”, “rear”, “left”, “right”, “upper”, and “lower” indicate directions based on the driver facing the front of the industrial vehicle.
  • the industrial vehicle is, for example, a forklift 10.
  • the forklift 10 includes drive wheels 12 provided at the front lower part of the vehicle body 11 and steering wheels 13 provided at the rear lower part of the vehicle body 11.
  • the cargo handling device 14 of the forklift 10 includes, for example, a mast erected on the front portion of the vehicle body 11 and a fork 16 coupled to the mast via, for example, a lift bracket 15. Configured to carry.
  • the vehicle body 11 is equipped with a traveling motor M1 for driving the drive wheels 12 and a cargo handling motor M2 for driving the cargo handling device 14.
  • the battery pack 30 is mounted on the lower part of the vehicle body 11, for example. Hereinafter, the battery pack 30 will be described in detail.
  • the battery pack 30 includes one or a plurality of battery modules 51 and a control device 41 that controls the battery modules 51.
  • the battery pack 30 includes a counterweight 32.
  • the counterweight 32 is configured to stabilize the traveling performance and / or operability of the industrial vehicle.
  • the counterweight 32 stabilizes the traveling of the industrial vehicle in a state where the load 19 is placed on the cargo handling device 14.
  • the counterweight 32 can be formed from a metal material such as iron.
  • the counterweight 32 is an L-shaped part including rectangular plate-like weight portions 33 and 34.
  • a corner 33 a is formed between the weight portion 33 and the weight portion 34.
  • the weight portion 34 can include a step portion 35 near the tip remote from the corner 33a.
  • a rectangular flat plate 36 is fixed to the step portion 35.
  • a control device 41 (battery ECU) and a junction box 42 are disposed on the shelf board 36.
  • the junction box 42 accommodates a relay and wiring not shown.
  • the battery pack 30 can include a case 31.
  • the case 31 includes lid members 37 and 38 provided on the short edges 33c and 33d of the weight portion 33, a lid member 39 provided on the long edge 33b of the weight portion 33, the tip of the weight portion 34, and And a top plate 40 supported by the lid members 37, 38, 39.
  • the lid members 37, 38, 39 and the top plate 40 are, for example, rectangular flat plates.
  • the counter weight 32, the cover members 37, 38, 39 and the top plate 40 constitute a square box-like case 31.
  • the battery module 51 is thermally coupled to the counterweight 32.
  • the battery module 51 is fixed to the side surface of the weight part 34 so that the battery module 51 and the weight part 34 are thermally coupled.
  • the battery module 51 has a plurality of battery cells 52. Therefore, in this embodiment, the counterweight 32 functions as a coupled member to which the battery cell 52 is fixed. Since the counterweight 32 is a part of the case 31, it can be said that the case 31 is a coupled member.
  • the battery pack 30 is provided with a temperature abnormality detection device 60.
  • the temperature abnormality detection device 60 When an abnormality occurs in the battery cell 52, the abnormality is detected by the temperature abnormality detection device 60.
  • the temperature abnormality detection device 60 will be described.
  • the first temperature sensor 61 is provided on the counterweight 32 and detects the temperature of the counterweight 32.
  • the first temperature sensor 61 functions as a temperature sensor for a coupled member.
  • the first temperature sensor 61 is attached to the weight part 33 or the weight part 34 and directly detects the temperature of the counterweight 32.
  • the first temperature sensor 61 is attached to the counter weight 32 in a floating state slightly separated from the counter weight 32, and estimates the temperature of the counter weight 32 from the heat transmitted from the counter weight 32. May be.
  • the first temperature sensor 61 may be provided inside the case 31 or may be provided outside the case 31.
  • the second temperature sensor 62 functions as a battery cell temperature sensor that detects the temperature of the battery cell 52.
  • the second temperature sensor 62 may be provided in each battery module 51.
  • the second temperature sensor 62 is attached to one battery cell 52 and directly detects the temperature of the battery cell 52.
  • the second temperature sensor 62 is attached to the battery cell 52 in a floating state slightly separated from the battery cell 52 and estimates the temperature of the battery cell 52 from the heat transmitted from the battery cell 52. May be.
  • the second temperature sensor 62 may be attached to a single battery cell 52 or may be attached to a plurality of battery cells 52. When the second temperature sensor 62 is attached to the plurality of battery cells 52, the average value of the temperatures of the plurality of battery cells 52 may be handled as a representative value of the temperature of the battery cells 52.
  • the first temperature sensor 61 and the second temperature sensor 62 are connected to the control device 41. Thereby, the control device 41 can detect or monitor the temperature of the counterweight 32 and the temperature of the battery cell 52.
  • the first temperature sensor 61, the second temperature sensor 62, and the control device 41 constitute a temperature abnormality detection device 60.
  • a signal supplied from the first temperature sensor 61 to the control device 41 may be referred to as a coupled member temperature signal.
  • a signal supplied from the second temperature sensor 62 to the control device 41 may be referred to as a battery cell temperature signal.
  • step S ⁇ b> 1 the control device 41 detects the temperature T ⁇ b> 1 of the battery cell 52.
  • step S ⁇ b > 2 the control device 41 detects the temperature T ⁇ b > 2 of the counterweight 32.
  • step S3 the controller 41 determines that the temperature T 1 of the battery cell 52, calculates the temperature difference between the temperature T 2 of the counterweight 32, whether the temperature difference exceeds a threshold value.
  • the temperature difference can be calculated as an absolute value of T 1 -T 2 , for example.
  • the control device 41 determines in step 4 that the temperature of the battery cell 52 is abnormal and ends the process. To do.
  • the control device 41 is configured to stop charging / discharging of the battery cell 52 by operating a relay, for example, as an abnormality handling action.
  • the control device 41 determines that the temperature of the battery cell 52 is normal and ends the process.
  • the control device 41 repeatedly performs the temperature abnormality detection routine shown in FIG. 4 while the battery cell 52 is being charged / discharged.
  • the change in the outside air temperature is indicated by a line L1
  • the change in the temperature of the battery cell 52 is indicated by a line L2
  • the change in the temperature of the counterweight 32 is indicated by a line L3.
  • the outside air temperature changes abruptly at time t ⁇ b> 1 when the forklift 10 enters a low temperature environment (for example, a refrigerator room or a freezer room).
  • a low temperature environment for example, a refrigerator room or a freezer room.
  • the temperature of the battery cell 52 gradually decreases due to heat exchange with the outside air. Due to the deviation between the temperature profile of the outside air temperature (line L1) and the temperature profile of the battery cell 52 (line L2), the temperature difference d1 between the outside air temperature immediately after time t1 and the temperature of the battery cell 52 tends to be greater than or equal to the threshold value. .
  • a conventional temperature abnormality detection device that directly detects the temperature of the outside air temperature and determines the temperature abnormality of the battery cell 52 based on the temperature difference between the temperature of the outside air temperature and the temperature of the battery cell 52 is provided in the battery cell 52. There is a possibility that the temperature of the battery cell 52 is determined to be abnormal although no abnormality has occurred.
  • the temperature abnormality detection device 60 of the present embodiment is configured to detect the temperature of the counterweight 32 and compare the temperature difference between the temperature of the counterweight 32 and the temperature of the battery cell 52 with a threshold value.
  • the temperature profile (line L2) of the battery cell 52 and the temperature profile (line L3) of the counterweight 32 are similar, and the temperature of the counterweight 32 and the battery cell 52 gradually approaches the outside air temperature by heat exchange with the outside air. . That is, when the outside air temperature changes from the temperature before the change to the temperature after the change, both the temperature of the counterweight 32 and the temperature of the battery cell 52 gradually approach the outside air temperature after the change.
  • the temperature difference d2 between the temperature of the battery cell 52 and the temperature of the counterweight 32 is unlikely to be greater than or equal to the threshold value. Therefore, it is prevented or reduced that the temperature of the battery cell 52 is determined to be abnormal although the battery cell 52 is not abnormal.
  • the threshold value a temperature difference between the temperature of the battery cell 52 and the counterweight 32 when the outside air temperature changes within the specified use environment temperature range, or an abnormality occurs in the battery cell 52 within the use environment temperature range of the specification. And the temperature difference between the temperature of the battery cell 52 and the temperature of the counterweight 32 is determined.
  • the threshold value when the outside air temperature changes in a state where no abnormality has occurred in the battery cell 52 from the above conditions, the battery cell 52 is not determined to be abnormal, and the battery cell 52 has a temperature abnormality.
  • the battery cell 52 is set to a value that is determined to be abnormal.
  • the threshold value can be stored in the memory 41 a of the control device 41.
  • the processor 41b may execute the temperature abnormality detection routine of FIG. 4 by executing a computer readable command stored in a computer readable recording medium such as the memory 41a.
  • the control device 41 determines that an abnormality has occurred in the battery cell 52 when the temperature difference between the temperature of the battery cell 52 and the temperature of the counterweight 32 is equal to or greater than the threshold value.
  • the temperature of the counterweight 32 gradually approaches the outside air temperature after a sudden change in the outside air temperature. For this reason, even if the outside air temperature changes drastically, the temperature difference between the temperature of the battery cell 52 and the temperature of the counterweight 32 is unlikely to be equal to or greater than the threshold value, and erroneous detection of temperature abnormality can be suppressed.
  • the temperature difference between the temperature of the battery cell 52 and the temperature of the counterweight 32 becomes equal to or greater than the threshold due to heat generation of the battery cell 52, and the temperature abnormality is detected by the control device 41.
  • the member to be coupled is the case 31.
  • the temperature of the case 31 that houses the battery cell 52 can be used to detect a temperature abnormality of the battery cell 52.
  • a part of the case 31 is constituted by the counterweight 32, and the first temperature sensor 61 detects the temperature of the counterweight 32.
  • the counterweight 32 is configured to stabilize the traveling of the industrial vehicle in a state where the load 19 is placed on the material handling device 14, and is heavy and has a large heat capacity. When the outside air temperature changes abruptly, the temperature of the counterweight 32 changes gradually. Therefore, even if the outside air temperature changes rapidly, the temperature difference between the temperature of the battery cell 52 and the temperature of the counterweight 32 is unlikely to become excessively large.
  • the present invention is not limited to the above-described embodiments (or one or more aspects thereof).
  • the member to be coupled may be any member as long as the member is thermally coupled to the battery cell 52.
  • the coupled member may be, for example, the vehicle body 11 of the forklift 10.
  • the state in which the battery cell 52 and the member to be coupled are thermally coupled is not limited to the case where the battery cell 52 and the member to be coupled are in direct contact, and the battery cell 52 and the member to be coupled have a space. This includes a state in which heat exchange can be performed through a state and a state in which heat exchange can be performed through inclusions.
  • the control device 41 stops the charging / discharging of the battery cell 52 as an abnormality handling action, but is not limited thereto.
  • the control device 41 may display the fact that an abnormality has occurred in the battery cell 52 on a display unit that can be visually recognized by the driver of the forklift 10, and prompt the driver to stop the forklift 10 or the like.
  • the control device 41 may output a temperature abnormality alert signal.
  • the temperature abnormality detection device 60 may be provided in a place other than the battery pack 30 (battery cell 52) mounted on the forklift 10.
  • the temperature abnormality detection device 60 is provided in the battery pack 30 having the plurality of battery modules 51, but the temperature abnormality detection device 60 is provided for a single battery module 51 or a single battery cell 52. May be.
  • the number of battery cells 52 may be any number.
  • the industrial vehicle may be an industrial vehicle other than a forklift such as a power shovel.
  • the control device 41 determines whether or not an abnormality has occurred in the battery cell 52 based on the temperature of the battery cell 52. Good.
  • the memory 41a of the control device 41 stores the allowable upper limit temperature and the allowable lower limit temperature
  • the processor 41b of the control device 41 is configured to compare the temperature of the battery cell 52 with the allowable upper limit temperature and the allowable lower limit temperature. Also good.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

A battery pack (30) includes a case (31) having a battery module (51) housed therein. The case (31) has a counter weight (32). A first temperature sensor (61) detects a temperature of the counter weight (32). A second temperature sensor (62) detects a temperature of a battery cell (52) in the battery module (51). A control apparatus (41) connected to the first temperature sensor (61) and the second temperature sensor (62) determines that the temperature of the battery cell (52) is abnormal in the cases where a temperature difference between the temperature of the battery cell (52) and the temperature of the counter weight (32) is equal to or more than a threshold value.

Description

温度異常検出装置Temperature abnormality detection device
　本発明は、電池セルの温度異常を検出する温度異常検出装置に関する。 The present invention relates to a temperature abnormality detection device that detects a temperature abnormality of a battery cell.
　電池セルに異常が生じると、電池セルの温度が過剰に上昇することがある。特許文献１には、このような電池セルの温度異常に起因する故障を未然に防ぐための充電装置が記載されている。 If the battery cell malfunctions, the battery cell temperature may rise excessively. Patent Document 1 describes a charging device for preventing such a failure due to a temperature abnormality of a battery cell.
　その充電装置は、二次電池（電池セル）の温度と、外気温とを検出し、二次電池の温度と外気温との温度差に基づき、二次電池の温度異常を検出し、二次電池の温度異常を検出したときに二次電池の充電を中止する。 The charging device detects the temperature of the secondary battery (battery cell) and the outside air temperature, detects the temperature abnormality of the secondary battery based on the temperature difference between the temperature of the secondary battery and the outside air temperature, When the battery temperature abnormality is detected, charging of the secondary battery is stopped.
特開平１１－５５８６９号公報Japanese Patent Laid-Open No. 11-55869
　ところで、外気温が急激に変化すると、二次電池の温度は、外気との熱交換によって緩やかに変化する。このときの二次電池の温度の変化プロファイルと外気温の変化プロファイルとのずれのために外気温と二次電池との温度差が大きくなることがある。その場合、特許文献１の充電装置は、二次電池に異常が生じていないにも関わらず、二次電池に異常が生じていると判断するおそれがある。 By the way, when the outside air temperature changes abruptly, the temperature of the secondary battery gradually changes due to heat exchange with the outside air. At this time, the temperature difference between the outside air temperature and the secondary battery may become large due to the difference between the temperature change profile of the secondary battery and the outside air temperature change profile. In that case, the charging device disclosed in Patent Document 1 may determine that an abnormality has occurred in the secondary battery even though no abnormality has occurred in the secondary battery.
　本発明の目的は、電池セルにおける温度異常の誤検出を抑制することができる温度異常検出装置を提供することにある。
　本発明の一側面は、被結合部材に熱的に結合された電池セルの温度異常を検出する温度異常検出装置であって、当該温度異常検出装置は、前記被結合部材の温度を検出する被結合部材用温度センサと、前記電池セルの温度を検出する電池セル用温度センサと、前記電池セルの温度と前記被結合部材の温度との温度差が閾値以上のときに前記電池セルの温度が異常と判断する制御装置とを備える。 The objective of this invention is providing the temperature abnormality detection apparatus which can suppress the erroneous detection of the temperature abnormality in a battery cell.
One aspect of the present invention is a temperature abnormality detection device that detects a temperature abnormality of a battery cell that is thermally coupled to a member to be coupled, and the temperature abnormality detection device detects the temperature of the member to be coupled. When the temperature difference between the temperature sensor for the coupling member, the temperature sensor for the battery cell that detects the temperature of the battery cell, and the temperature of the battery cell and the temperature of the coupled member is equal to or greater than a threshold value, the temperature of the battery cell And a control device that determines that there is an abnormality.
　本発明の一側面に従う温度異常検出装置は、電池セルの温度と被結合部材の温度の温度差によって電池セルの温度異常を判断するように構成されている。外気温が急激に変化したとき、被結合部材の温度と電池セルの温度はともに変化後の外気温に緩やかに近づくため、電池セルの温度と被結合部材の温度との温度差は過剰に大きくなりにくい。したがって、本発明の一側面に従う温度異常検出装置は、外気温が急激に変化したときであっても電池セルにおける温度異常の誤検出を抑制することができる。 The temperature abnormality detection device according to one aspect of the present invention is configured to determine a temperature abnormality of the battery cell based on a temperature difference between the temperature of the battery cell and the temperature of the coupled member. When the outside air temperature changes abruptly, both the temperature of the coupled member and the temperature of the battery cell gradually approach the outside temperature after the change, so the temperature difference between the temperature of the battery cell and the temperature of the coupled member is excessively large. Hard to become. Therefore, the temperature abnormality detection device according to one aspect of the present invention can suppress erroneous detection of temperature abnormality in the battery cell even when the outside air temperature changes rapidly.
　他の態様および利点は本発明の技術的思想の例を示す図面と共に以下の記載から明らかとなる。
　本発明の新規であると思われる特徴は、特に添付した請求の範囲において明らかとなる。目的および利点とともに本発明は、以下に示す実施態様の説明を添付の図面を参照することによって理解される。 Other aspects and advantages will become apparent from the following description taken in conjunction with the drawings, which illustrate examples of the technical spirit of the present invention.
The features believed to be novel of the invention will be apparent particularly from the appended claims. The invention, together with objects and advantages, will be better understood by reference to the accompanying drawings in the following description of the embodiments.
フォークリフトの概略側面図。The schematic side view of a forklift. 電池パックの斜視図。The perspective view of a battery pack. 温度異常検出装置のブロック図。The block diagram of a temperature abnormality detection apparatus. 制御装置が行う温度異常検出ルーチンを示すフローチャート。The flowchart which shows the temperature abnormality detection routine which a control apparatus performs. 温度異常検出装置の作用を説明するための図。The figure for demonstrating the effect | action of a temperature abnormality detection apparatus.
　以下、一実施形態に従う温度異常検出装置について説明する。
　温度異常検出装置は、産業車両に搭載される電池パックに設けられ得る。以下の説明において「前」「後」「左」「右」「上」「下」は、産業車両の前方を向いた運転者を基準とした方向を示す。 Hereinafter, a temperature abnormality detection device according to an embodiment will be described.
The temperature abnormality detection device can be provided in a battery pack mounted on an industrial vehicle. In the following description, “front”, “rear”, “left”, “right”, “upper”, and “lower” indicate directions based on the driver facing the front of the industrial vehicle.
　図１に示すように、産業車両は例えばフォークリフト１０である。フォークリフト１０は、車体１１の前下部に設けられる駆動輪１２と、車体１１の後下部に設けられる操舵輪１３とを含む。フォークリフト１０の荷役装置１４は、例えば、車体１１の前部に立設されているマストと、当該マストに、例えばリフトブラケット１５を介して結合されるフォーク１６とを含み、フォーク１６で積荷１９を運ぶように構成される。車体１１には、駆動輪１２を駆動するための走行用モータＭ１と、荷役装置１４を駆動するための荷役用モータＭ２とが搭載される。電池パック３０は例えば車体１１の下部に搭載される。以下、電池パック３０について詳細に説明する。 As shown in FIG. 1, the industrial vehicle is, for example, a forklift 10. The forklift 10 includes drive wheels 12 provided at the front lower part of the vehicle body 11 and steering wheels 13 provided at the rear lower part of the vehicle body 11. The cargo handling device 14 of the forklift 10 includes, for example, a mast erected on the front portion of the vehicle body 11 and a fork 16 coupled to the mast via, for example, a lift bracket 15. Configured to carry. The vehicle body 11 is equipped with a traveling motor M1 for driving the drive wheels 12 and a cargo handling motor M2 for driving the cargo handling device 14. The battery pack 30 is mounted on the lower part of the vehicle body 11, for example. Hereinafter, the battery pack 30 will be described in detail.
　図２に示すように、電池パック３０は、一または複数の電池モジュール５１と、電池モジュール５１の制御を行う制御装置４１とを含む。電池パック３０は、カウンタウェイト３２を備える。カウンタウェイト３２は、産業車両の走行性及び／または操作性を安定化するように構成されており、例えば、積荷１９が荷役装置１４に載せられた状態で産業車両の走行を安定化させる。カウンタウェイト３２は、鉄などの金属材料から形成することができる。図示した例では、カウンタウェイト３２は、矩形板状ウェイト部３３、３４を含むＬ字部品である。ウェイト部３３とウェイト部３４との間に角３３ａが形成される。ウェイト部３４は、角３３ａから遠隔にある先端付近に段差部３５を含むことができる。段差部３５には、例えば矩形平板状の棚板３６が固定される。棚板３６上には、制御装置４１（電池ＥＣＵ）及びジャンクションボックス４２が配設される。ジャンクションボックス４２は図示しないリレーや配線を収容する。 As shown in FIG. 2, the battery pack 30 includes one or a plurality of battery modules 51 and a control device 41 that controls the battery modules 51. The battery pack 30 includes a counterweight 32. The counterweight 32 is configured to stabilize the traveling performance and / or operability of the industrial vehicle. For example, the counterweight 32 stabilizes the traveling of the industrial vehicle in a state where the load 19 is placed on the cargo handling device 14. The counterweight 32 can be formed from a metal material such as iron. In the illustrated example, the counterweight 32 is an L-shaped part including rectangular plate- like weight portions 33 and 34. A corner 33 a is formed between the weight portion 33 and the weight portion 34. The weight portion 34 can include a step portion 35 near the tip remote from the corner 33a. For example, a rectangular flat plate 36 is fixed to the step portion 35. A control device 41 (battery ECU) and a junction box 42 are disposed on the shelf board 36. The junction box 42 accommodates a relay and wiring not shown.
　電池パック３０はケース３１を備えることができる。図示した例では、ケース３１は、ウェイト部３３の短縁３３ｃ及び３３ｄにそれぞれ設けられる蓋部材３７及び３８と、ウェイト部３３の長縁３３ｂに設けられる蓋部材３９と、ウェイト部３４の先端及び蓋部材３７，３８，３９に支持される天板４０とを含む。蓋部材３７，３８，３９及び天板４０は例えば矩形平板である。カウンタウェイト３２、蓋部材３７，３８，３９及び天板４０によって四角箱状のケース３１が構成されている。 The battery pack 30 can include a case 31. In the illustrated example, the case 31 includes lid members 37 and 38 provided on the short edges 33c and 33d of the weight portion 33, a lid member 39 provided on the long edge 33b of the weight portion 33, the tip of the weight portion 34, and And a top plate 40 supported by the lid members 37, 38, 39. The lid members 37, 38, 39 and the top plate 40 are, for example, rectangular flat plates. The counter weight 32, the cover members 37, 38, 39 and the top plate 40 constitute a square box-like case 31.
　電池モジュール５１はカウンタウェイト３２と熱的に結合される。例えば、電池モジュール５１は、電池モジュール５１とウェイト部３４とが熱的に結合されるように、ウェイト部３４の側面に固定される。電池モジュール５１は、複数の電池セル５２を有する。したがって、本実施形態において、カウンタウェイト３２は、電池セル５２が固定される被結合部材として機能する。カウンタウェイト３２はケース３１の一部であるため、ケース３１が被結合部材であるともいえる。 The battery module 51 is thermally coupled to the counterweight 32. For example, the battery module 51 is fixed to the side surface of the weight part 34 so that the battery module 51 and the weight part 34 are thermally coupled. The battery module 51 has a plurality of battery cells 52. Therefore, in this embodiment, the counterweight 32 functions as a coupled member to which the battery cell 52 is fixed. Since the counterweight 32 is a part of the case 31, it can be said that the case 31 is a coupled member.
　電池パック３０に温度異常検出装置６０が設けられる。電池セル５２に異常が生じた場合には、温度異常検出装置６０によって異常が検出される。以下、温度異常検出装置６０について説明する。 The battery pack 30 is provided with a temperature abnormality detection device 60. When an abnormality occurs in the battery cell 52, the abnormality is detected by the temperature abnormality detection device 60. Hereinafter, the temperature abnormality detection device 60 will be described.
　図３に示すように、第１の温度センサ６１はカウンタウェイト３２に設けられ、カウンタウェイト３２の温度を検出する。第１の温度センサ６１は被結合部材用温度センサとして機能する。一例では、第１の温度センサ６１は、ウェイト部３３またはウェイト部３４に取り付けられ、直接カウンタウェイト３２の温度を検出する。周囲温度の影響が少ない場合には、第１の温度センサ６１は、カウンタウェイト３２から若干離間したフローティング状態でカウンタウェイト３２に取り付けられて、カウンタウェイト３２から伝わる熱からカウンタウェイト３２の温度を推測してもよい。第１の温度センサ６１は、ケース３１の内側に設けられてもよいし、ケース３１の外側に設けられてもよい。 As shown in FIG. 3, the first temperature sensor 61 is provided on the counterweight 32 and detects the temperature of the counterweight 32. The first temperature sensor 61 functions as a temperature sensor for a coupled member. In one example, the first temperature sensor 61 is attached to the weight part 33 or the weight part 34 and directly detects the temperature of the counterweight 32. When the influence of the ambient temperature is small, the first temperature sensor 61 is attached to the counter weight 32 in a floating state slightly separated from the counter weight 32, and estimates the temperature of the counter weight 32 from the heat transmitted from the counter weight 32. May be. The first temperature sensor 61 may be provided inside the case 31 or may be provided outside the case 31.
　第２の温度センサ６２は、電池セル５２の温度を検出する電池セル用温度センサとして機能する。電池パック３０が複数の電池モジュール５１を含む場合、各電池モジュール５１に第２の温度センサ６２を設けてもよい。第２の温度センサ６２は、一電池セル５２に取り付けられることで、直接にその電池セル５２の温度を検出する。周囲温度の影響が少ない場合には、第２の温度センサ６２は、電池セル５２から若干離間したフローティング状態で電池セル５２に取り付けられて、電池セル５２から伝わる熱から電池セル５２の温度を推測してもよい。第２の温度センサ６２は、単数の電池セル５２に取り付けられていてもよいし、複数の電池セル５２に取り付けられていてもよい。複数の電池セル５２に第２の温度センサ６２が取り付けられる場合には、複数の電池セル５２の温度の平均値を電池セル５２の温度の代表値として取り扱ってもよい。 The second temperature sensor 62 functions as a battery cell temperature sensor that detects the temperature of the battery cell 52. When the battery pack 30 includes a plurality of battery modules 51, the second temperature sensor 62 may be provided in each battery module 51. The second temperature sensor 62 is attached to one battery cell 52 and directly detects the temperature of the battery cell 52. When the influence of the ambient temperature is small, the second temperature sensor 62 is attached to the battery cell 52 in a floating state slightly separated from the battery cell 52 and estimates the temperature of the battery cell 52 from the heat transmitted from the battery cell 52. May be. The second temperature sensor 62 may be attached to a single battery cell 52 or may be attached to a plurality of battery cells 52. When the second temperature sensor 62 is attached to the plurality of battery cells 52, the average value of the temperatures of the plurality of battery cells 52 may be handled as a representative value of the temperature of the battery cells 52.
　第１の温度センサ６１及び第２の温度センサ６２は、制御装置４１に接続されている。これにより、制御装置４１は、カウンタウェイト３２の温度及び電池セル５２の温度を検出または監視することができる。本実施形態では、第１の温度センサ６１、第２の温度センサ６２及び制御装置４１によって温度異常検出装置６０が構成される。第１の温度センサ６１から制御装置４１に供給される信号は、被結合部材温度信号と呼ぶことがある。第２の温度センサ６２から制御装置４１に供給される信号は、電池セル温度信号と呼ぶことがある。 The first temperature sensor 61 and the second temperature sensor 62 are connected to the control device 41. Thereby, the control device 41 can detect or monitor the temperature of the counterweight 32 and the temperature of the battery cell 52. In the present embodiment, the first temperature sensor 61, the second temperature sensor 62, and the control device 41 constitute a temperature abnormality detection device 60. A signal supplied from the first temperature sensor 61 to the control device 41 may be referred to as a coupled member temperature signal. A signal supplied from the second temperature sensor 62 to the control device 41 may be referred to as a battery cell temperature signal.
　次に、制御装置４１が行う温度異常検出ルーチンについて説明する。
　図４に示すように、ステップＳ１において、制御装置４１は、電池セル５２の温度Ｔ１を検出する。ステップＳ２において、制御装置４１は、カウンタウェイト３２の温度Ｔ２を検出する。ステップＳ３において、制御装置４１は、電池セル５２の温度Ｔ１と、カウンタウェイト３２の温度Ｔ２との温度差を算出し、その温度差が閾値以上か否かを判定する。温度差は、例えばＴ１－Ｔ２の絶対値として算出され得る。 Next, a temperature abnormality detection routine performed by the control device 41 will be described.
As shown in FIG. 4, in step S <b> 1, the control device 41 detects the temperature T <b> 1 of the battery cell 52. In step S < b > 2, the control device 41 detects the temperature T < b > 2 of the counterweight 32. In step S3, the controller 41 determines that the temperature T 1 of the battery cell 52, calculates the temperature difference between the temperature T 2 of the counterweight 32, whether the temperature difference exceeds a threshold value. The temperature difference can be calculated as an absolute value of T 1 -T 2 , for example.
　電池セル５２の温度とカウンタウェイト３２の温度との温度差が閾値以上の場合（ステップＳ３でＹＥＳ）、制御装置４１は、ステップ４において、電池セル５２の温度が異常と判断し、処理を終了する。制御装置４１は、電池セル５２の温度を異常と判断した場合には、異常対処アクションとして、例えばリレーを操作して、電池セル５２の充放電を停止させるように構成される。 When the temperature difference between the temperature of the battery cell 52 and the temperature of the counterweight 32 is equal to or greater than the threshold value (YES in step S3), the control device 41 determines in step 4 that the temperature of the battery cell 52 is abnormal and ends the process. To do. When it is determined that the temperature of the battery cell 52 is abnormal, the control device 41 is configured to stop charging / discharging of the battery cell 52 by operating a relay, for example, as an abnormality handling action.
　電池セル５２の温度とカウンタウェイト３２の温度との温度差が閾値未満の場合（ステップＳ３でＮＯ）、制御装置４１は、電池セル５２の温度が正常と判定し、処理を終了する。制御装置４１は、電池セル５２が充放電されている間、図４に示した温度異常検出ルーチンを繰り返し行う。 When the temperature difference between the temperature of the battery cell 52 and the temperature of the counterweight 32 is less than the threshold (NO in step S3), the control device 41 determines that the temperature of the battery cell 52 is normal and ends the process. The control device 41 repeatedly performs the temperature abnormality detection routine shown in FIG. 4 while the battery cell 52 is being charged / discharged.
　次に、本実施形態の温度異常検出装置６０の作用について図５にしたがって説明する。図５では、外気温の変化を線Ｌ１で示し、電池セル５２の温度の変化を線Ｌ２で示し、カウンタウェイト３２の温度の変化を線Ｌ３で示す。 Next, the operation of the temperature abnormality detection device 60 of this embodiment will be described with reference to FIG. In FIG. 5, the change in the outside air temperature is indicated by a line L1, the change in the temperature of the battery cell 52 is indicated by a line L2, and the change in the temperature of the counterweight 32 is indicated by a line L3.
　図５に示すように、フォークリフト１０が、温度が低い環境（例えば、冷蔵室や冷凍室）に進入した時刻ｔ１において、外気温は急激に変化する。このとき、電池セル５２の温度は外気との熱交換によって緩やかに低下する。外気温の温度プロファイル（線Ｌ１）と電池セル５２の温度プロファイル（線Ｌ２）とのずれのために、時刻ｔ１直後の外気温と電池セル５２の温度との温度差ｄ１が閾値以上になりやすい。そのため、外気温の温度を直接検出して、外気温の温度と電池セル５２の温度との温度差に基づいて電池セル５２の温度異常を判定する従来の温度異常検出装置は、電池セル５２に異常が生じていないにも関わらず、電池セル５２の温度が異常と判断するおそれがある。 As shown in FIG. 5, the outside air temperature changes abruptly at time t <b> 1 when the forklift 10 enters a low temperature environment (for example, a refrigerator room or a freezer room). At this time, the temperature of the battery cell 52 gradually decreases due to heat exchange with the outside air. Due to the deviation between the temperature profile of the outside air temperature (line L1) and the temperature profile of the battery cell 52 (line L2), the temperature difference d1 between the outside air temperature immediately after time t1 and the temperature of the battery cell 52 tends to be greater than or equal to the threshold value. . Therefore, a conventional temperature abnormality detection device that directly detects the temperature of the outside air temperature and determines the temperature abnormality of the battery cell 52 based on the temperature difference between the temperature of the outside air temperature and the temperature of the battery cell 52 is provided in the battery cell 52. There is a possibility that the temperature of the battery cell 52 is determined to be abnormal although no abnormality has occurred.
　一方、本実施形態の温度異常検出装置６０は、カウンタウェイト３２の温度を検出し、カウンタウェイト３２の温度と電池セル５２の温度との温度差を閾値と比較するように構成さている。電池セル５２の温度プロファイル（線Ｌ２）とカウンタウェイト３２の温度プロファイル（線Ｌ３）は類似しており、カウンタウェイト３２及び電池セル５２の温度は、外気との熱交換によって緩やかに外気温に近づく。すなわち、外気温が変化前の温度から変化後の温度に変化したとき、カウンタウェイト３２の温度と電池セル５２の温度は、ともに緩やかに変化後の外気温に近づいていくため、外気温が急激に変化したとしても、電池セル５２の温度とカウンタウェイト３２の温度との温度差ｄ２は閾値以上になりにくい。したがって、電池セル５２に異常が生じていないにも関わらず、電池セル５２の温度が異常と判断されることは防止または低減される。図５の時刻ｔ１において外気温が急激に低下した状況について説明したが、外気温が急激に上昇した状況においても同様の作用効果が得られる。 On the other hand, the temperature abnormality detection device 60 of the present embodiment is configured to detect the temperature of the counterweight 32 and compare the temperature difference between the temperature of the counterweight 32 and the temperature of the battery cell 52 with a threshold value. The temperature profile (line L2) of the battery cell 52 and the temperature profile (line L3) of the counterweight 32 are similar, and the temperature of the counterweight 32 and the battery cell 52 gradually approaches the outside air temperature by heat exchange with the outside air. . That is, when the outside air temperature changes from the temperature before the change to the temperature after the change, both the temperature of the counterweight 32 and the temperature of the battery cell 52 gradually approach the outside air temperature after the change. Even if the temperature changes, the temperature difference d2 between the temperature of the battery cell 52 and the temperature of the counterweight 32 is unlikely to be greater than or equal to the threshold value. Therefore, it is prevented or reduced that the temperature of the battery cell 52 is determined to be abnormal although the battery cell 52 is not abnormal. Although the situation in which the outside air temperature has suddenly decreased at time t1 in FIG. 5 has been described, the same effect can be obtained even in a situation in which the outside air temperature has risen sharply.
　閾値は、仕様の使用環境温度範囲内で外気温が変化したときの電池セル５２の温度とカウンタウェイト３２の温度との温度差や、仕様の使用環境温度範囲内で電池セル５２に異常が生じたときの電池セル５２の温度とカウンタウェイト３２の温度との温度差などから定められる。閾値としては、上記した条件から、電池セル５２に異常が生じていない状態で外気温が変化したときに電池セル５２が異常と判断されず、かつ、電池セル５２に温度異常が生じたときに電池セル５２が異常と判断される値に設定される。閾値は、制御装置４１のメモリ４１ａに格納され得る。プロセッサ４１ｂは、メモリ４１ａのようなコンピュータ読み取り可能記録媒体に格納されたコンピュータ読み取り可能指令を実行することによって、図４の温度異常検出ルーチンを実行してもよい。 As for the threshold value, a temperature difference between the temperature of the battery cell 52 and the counterweight 32 when the outside air temperature changes within the specified use environment temperature range, or an abnormality occurs in the battery cell 52 within the use environment temperature range of the specification. And the temperature difference between the temperature of the battery cell 52 and the temperature of the counterweight 32 is determined. As the threshold value, when the outside air temperature changes in a state where no abnormality has occurred in the battery cell 52 from the above conditions, the battery cell 52 is not determined to be abnormal, and the battery cell 52 has a temperature abnormality. The battery cell 52 is set to a value that is determined to be abnormal. The threshold value can be stored in the memory 41 a of the control device 41. The processor 41b may execute the temperature abnormality detection routine of FIG. 4 by executing a computer readable command stored in a computer readable recording medium such as the memory 41a.
　実施形態あるいはその１つまたは複数の態様によれば、以下のような効果を得ることができる。
　（１）制御装置４１は、電池セル５２の温度とカウンタウェイト３２の温度との温度差が閾値以上のときに、電池セル５２に異常が生じていると判断する。カウンタウェイト３２の温度は、外気温の急激な変化後に、緩やかに外気温に近づく。このため、外気温が急激に変化しても、電池セル５２の温度とカウンタウェイト３２の温度との温度差が閾値以上になりにくく、温度異常の誤検出を抑制することができる。電池セル５２の異常時には、電池セル５２の発熱によって電池セル５２の温度とカウンタウェイト３２の温度との温度差が閾値以上となり、温度異常は制御装置４１によって検出される。 According to the embodiment or one or more aspects thereof, the following effects can be obtained.
(1) The control device 41 determines that an abnormality has occurred in the battery cell 52 when the temperature difference between the temperature of the battery cell 52 and the temperature of the counterweight 32 is equal to or greater than the threshold value. The temperature of the counterweight 32 gradually approaches the outside air temperature after a sudden change in the outside air temperature. For this reason, even if the outside air temperature changes drastically, the temperature difference between the temperature of the battery cell 52 and the temperature of the counterweight 32 is unlikely to be equal to or greater than the threshold value, and erroneous detection of temperature abnormality can be suppressed. When the battery cell 52 is abnormal, the temperature difference between the temperature of the battery cell 52 and the temperature of the counterweight 32 becomes equal to or greater than the threshold due to heat generation of the battery cell 52, and the temperature abnormality is detected by the control device 41.
　（２）いくつかの例では、被結合部材はケース３１である。この構成によれば、電池セル５２を収容するケース３１の温度を、電池セル５２の温度異常の検出に利用することができる。 (2) In some examples, the member to be coupled is the case 31. According to this configuration, the temperature of the case 31 that houses the battery cell 52 can be used to detect a temperature abnormality of the battery cell 52.
　（３）いくつかの例では、ケース３１の一部がカウンタウェイト３２によって構成され、第１の温度センサ６１は、カウンタウェイト３２の温度を検出する。カウンタウェイト３２は、積荷１９が荷役装置１４に載せられた状態で産業車両の走行を安定化させるように構成されており、重く、熱容量が大きい。外気温が急激に変化したときに、カウンタウェイト３２の温度の変化は緩やかである。したがって、外気温が急激に変化しても、電池セル５２の温度とカウンタウェイト３２の温度との温度差が過剰に大きくなりにくい。 (3) In some examples, a part of the case 31 is constituted by the counterweight 32, and the first temperature sensor 61 detects the temperature of the counterweight 32. The counterweight 32 is configured to stabilize the traveling of the industrial vehicle in a state where the load 19 is placed on the material handling device 14, and is heavy and has a large heat capacity. When the outside air temperature changes abruptly, the temperature of the counterweight 32 changes gradually. Therefore, even if the outside air temperature changes rapidly, the temperature difference between the temperature of the battery cell 52 and the temperature of the counterweight 32 is unlikely to become excessively large.
　本発明は上述の実施形態（あるいはその１つまたは複数の態様）に限定されない。例えば、実施形態は以下のように変更してもよい。
　被結合部材は、電池セル５２と熱的に結合されている部材であれば、どのような部材であってもよい。被結合部材は、例えば、フォークリフト１０の車体１１などであってもよい。なお、電池セル５２と被結合部材が熱的に結合されている状態とは、電池セル５２と被結合部材が直接接触している場合に限られず、電池セル５２と被結合部材が、空間を介して熱交換を行える場合や、介在物を介して熱交換を行えるような状態も含む。 The present invention is not limited to the above-described embodiments (or one or more aspects thereof). For example, the embodiment may be changed as follows.
The member to be coupled may be any member as long as the member is thermally coupled to the battery cell 52. The coupled member may be, for example, the vehicle body 11 of the forklift 10. The state in which the battery cell 52 and the member to be coupled are thermally coupled is not limited to the case where the battery cell 52 and the member to be coupled are in direct contact, and the battery cell 52 and the member to be coupled have a space. This includes a state in which heat exchange can be performed through a state and a state in which heat exchange can be performed through inclusions.
　実施形態において、制御装置４１は、異常対処アクションとして、電池セル５２の充放電を停止させたが、これに限られない。例えば、制御装置４１は、フォークリフト１０の運転者が視認できる表示部に電池セル５２に異常が生じたことを表示して、運転者にフォークリフト１０の停止などを促してもよい。制御装置４１は、温度異常アラート信号を出力してもよい。 In the embodiment, the control device 41 stops the charging / discharging of the battery cell 52 as an abnormality handling action, but is not limited thereto. For example, the control device 41 may display the fact that an abnormality has occurred in the battery cell 52 on a display unit that can be visually recognized by the driver of the forklift 10, and prompt the driver to stop the forklift 10 or the like. The control device 41 may output a temperature abnormality alert signal.
　温度異常検出装置６０は、フォークリフト１０に搭載される電池パック３０（電池セル５２）以外の場所に設けられてもよい。
　実施形態では、複数の電池モジュール５１を有する電池パック３０に温度異常検出装置６０を設けたが、温度異常検出装置６０は、単一の電池モジュール５１や、単一の電池セル５２に対して設けてもよい。電池セル５２の数は、いくつであってもよい。 The temperature abnormality detection device 60 may be provided in a place other than the battery pack 30 (battery cell 52) mounted on the forklift 10.
In the embodiment, the temperature abnormality detection device 60 is provided in the battery pack 30 having the plurality of battery modules 51, but the temperature abnormality detection device 60 is provided for a single battery module 51 or a single battery cell 52. May be. The number of battery cells 52 may be any number.
　産業車両は、パワーショベルなどのフォークリフト以外の産業車両であってもよい。
　ステップＳ３で電池セル５２の温度とカウンタウェイト３２の温度を比較する前に、制御装置４１は、電池セル５２の温度に基づいて、電池セル５２に異常が生じているか否かを判定してもよい。例えば、制御装置４１のメモリ４１ａは、許容上限温度及び許容下限温度を格納し、制御装置４１のプロセッサ４１ｂは、電池セル５２の温度を許容上限温度及び許容下限温度と比較するように構成されてもよい。 The industrial vehicle may be an industrial vehicle other than a forklift such as a power shovel.
Before comparing the temperature of the battery cell 52 with the temperature of the counterweight 32 in step S3, the control device 41 determines whether or not an abnormality has occurred in the battery cell 52 based on the temperature of the battery cell 52. Good. For example, the memory 41a of the control device 41 stores the allowable upper limit temperature and the allowable lower limit temperature, and the processor 41b of the control device 41 is configured to compare the temperature of the battery cell 52 with the allowable upper limit temperature and the allowable lower limit temperature. Also good.
　本発明がその技術的思想から逸脱しない範囲で他の特有の形態で具体化されてもよいということは当業者にとって明らかであろう。例えば、実施形態（あるいはその１つまたは複数の態様）において説明した部品のうちの一部を省略したり、いくつかの部品を組合せてもよい。本発明の範囲は、添付請求の範囲を参照して、添付請求の範囲が権利を与えられる均等物の全範囲と共に確定されるべきである。 It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the technical concept thereof. For example, some of the components described in the embodiment (or one or more aspects thereof) may be omitted, or some components may be combined. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

Claims (10)

  1. 　被結合部材に熱的に結合された電池セルの温度異常を検出する温度異常検出装置であって、
    　前記被結合部材の温度を検出する被結合部材用温度センサと、
    　前記電池セルの温度を検出する電池セル用温度センサと、
    　前記電池セルの温度と前記被結合部材の温度との温度差が閾値以上のときに前記電池セルの温度が異常と判断する制御装置とを備える、温度異常検出装置。     A temperature abnormality detection device for detecting a temperature abnormality of a battery cell thermally coupled to a member to be coupled,
    A temperature sensor for a coupled member that detects the temperature of the coupled member;
    A battery cell temperature sensor for detecting the temperature of the battery cell;
    A temperature abnormality detection device comprising: a control device that determines that the temperature of the battery cell is abnormal when a temperature difference between the temperature of the battery cell and the temperature of the coupled member is equal to or greater than a threshold value.
  2. 　前記被結合部材は、前記電池セルを収容するケースであることを特徴とする請求項１に記載の温度異常検出装置。 The temperature abnormality detection device according to claim 1, wherein the coupled member is a case that houses the battery cell.
  3. 　前記被結合部材は、積荷を搬送する産業車両に搭載されるカウンタウェイトであることを特徴とする請求項１に記載の温度異常検出装置。 The temperature abnormality detection device according to claim 1, wherein the coupled member is a counterweight mounted on an industrial vehicle that transports a load.
  4. 　前記ケースの一部は、カウンタウェイトである、請求項２に記載の温度異常検出装置。 The temperature abnormality detection device according to claim 2, wherein a part of the case is a counterweight.
  5. 　前記電池セル用温度センサは、検出した電池セルの温度に応じた電池セル温度信号を出力するように構成され、
    　前記被結合部材用温度センサは、検出した被結合部材の温度に応じた被結合部材温度信号を出力するように構成され、
    　前記制御装置は、前記被結合部材用温度センサ及び前記電池セル用温度センサと直接にまたは間接的に接続され、前記閾値を格納し、前記被結合部材温度信号、前記電池セル温度信号、及び前記閾値に基づき、前記電池セルの温度が異常かどうかを判断するように構成されている、請求項１に記載の温度異常検出装置。     The battery cell temperature sensor is configured to output a battery cell temperature signal corresponding to the detected temperature of the battery cell,
    The coupled member temperature sensor is configured to output a coupled member temperature signal corresponding to the detected temperature of the coupled member,
    The control device is directly or indirectly connected to the temperature sensor for the coupled member and the temperature sensor for the battery cell, stores the threshold value, the coupled member temperature signal, the battery cell temperature signal, and the The temperature abnormality detection device according to claim 1, wherein the temperature abnormality detection device is configured to determine whether the temperature of the battery cell is abnormal based on a threshold value.
  6. 　電池セルと、
    　前記電池セルに熱的に結合される被結合部材と、
    　前記被結合部材の温度を検出し、被結合部材温度信号を出力するように構成される被結合部材用温度センサと、
    　前記電池セルの温度を検出し、電池セル温度信号を出力するように構成される電池セル用温度センサと、
    　前記被結合部材温度信号及び前記電池セル温度信号を受信すべく前記被結合部材用温度センサ及び電池セル用温度センサと直接にまたは間接的に接続され、前記電池セルの温度と前記被結合部材の温度との温度差、及び温度差閾値に基づき、前記電池セルの温度が異常かどうかを判断する制御装置とを備える、電池パック。     A battery cell;
    A coupled member thermally coupled to the battery cell;
    A temperature sensor for a coupled member configured to detect a temperature of the coupled member and output a coupled member temperature signal;
    A temperature sensor for the battery cell configured to detect the temperature of the battery cell and output a battery cell temperature signal;
    Directly or indirectly connected to the temperature sensor for the coupled member and the temperature sensor for the battery cell to receive the temperature signal for the coupled member and the battery cell temperature signal, the temperature of the battery cell and the temperature of the coupled member A battery pack comprising: a control device that determines whether or not the temperature of the battery cell is abnormal based on a temperature difference from the temperature and a temperature difference threshold value.
  7. 　前記制御装置は、前記電池セルの温度と前記被結合部材の温度との温度差が前記温度差閾値以上であるときに、前記電池セルの温度が異常と判断する、請求項６に記載の電池パック。 The battery according to claim 6, wherein the control device determines that the temperature of the battery cell is abnormal when a temperature difference between the temperature of the battery cell and the temperature of the coupled member is equal to or greater than the temperature difference threshold value. pack.
  8. 　前記被結合部材は、前記電池セルと外気との間に配置される、請求項６に記載の電池パック。 The battery pack according to claim 6, wherein the coupled member is disposed between the battery cell and outside air.
  9. 　前記制御装置は、前記温度差閾値を格納するメモリを含む、請求項６に記載の電池パック。 The battery pack according to claim 6, wherein the control device includes a memory for storing the temperature difference threshold value.
  10. 　請求項６乃至９のいずれか一項に記載の電池パックを備える産業車両。 An industrial vehicle comprising the battery pack according to any one of claims 6 to 9.
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