WO2022009396A1 - Battery pack and method for manufacturing battery pack - Google Patents

Battery pack and method for manufacturing battery pack Download PDF

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Publication number
WO2022009396A1
WO2022009396A1 PCT/JP2020/026899 JP2020026899W WO2022009396A1 WO 2022009396 A1 WO2022009396 A1 WO 2022009396A1 JP 2020026899 W JP2020026899 W JP 2020026899W WO 2022009396 A1 WO2022009396 A1 WO 2022009396A1
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WO
WIPO (PCT)
Prior art keywords
positive electrode
thermistor
electrode tab
battery pack
tab
Prior art date
Application number
PCT/JP2020/026899
Other languages
French (fr)
Japanese (ja)
Inventor
邦治 鈴木
Original Assignee
ソニーグループ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ソニーグループ株式会社 filed Critical ソニーグループ株式会社
Priority to PCT/JP2020/026899 priority Critical patent/WO2022009396A1/en
Priority to CN202080102651.5A priority patent/CN115803923A/en
Publication of WO2022009396A1 publication Critical patent/WO2022009396A1/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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • 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
    • H01M10/44—Methods for charging or discharging
    • H01M10/443—Methods for charging or discharging in response to temperature
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
    • 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/10—Temperature sensitive devices
    • H01M2200/105—NTC
    • 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

Definitions

  • the present invention relates to a battery pack and a method for manufacturing a battery pack.
  • the battery pack is equipped with a protection circuit to protect the battery cell from overcharge, overdischarge and overcurrent.
  • the protection circuit is provided with a FET (Field-Effective Transmitter) for cutting off the charge current and the discharge current to the battery cell in the event of an abnormality.
  • FET Field-Effective Transmitter
  • a thermistor for detecting the temperature of the battery cell is mounted on the substrate on which the protection circuit is formed. If the detection temperature of the thermistor exceeds the set range, it is determined to be abnormal and the charge current and discharge current are controlled.
  • a battery pack capable of accurately detecting the temperature of the battery cell and a method for manufacturing the battery pack.
  • a battery cell having a positive electrode tab made of aluminum, a protection circuit board having a protection circuit for protecting the battery cell from overcharging and overdischarging, and the positive electrode tab directly or via a heat conductive member.
  • a battery pack having an indirect contact thermista and a method for manufacturing the same are provided.
  • FIG. 1 is a schematic view of the battery pack 1 of the first embodiment.
  • 2 and 3 are schematic views of the battery cell 10 included in the battery pack 1.
  • FIG. 4 is a schematic view of the protection circuit board 20 included in the battery pack 1.
  • the battery pack 1 has a battery cell 10, a protective circuit board 20, an FPC (Flexible Printed Circuits) 29, an insulating sheet 31, a cushion sheet 32, and a holder 40.
  • a label sticker 19 is attached to the surface of the battery cell 10.
  • the battery cell 10 is a battery cell 10 in which a positive electrode 12, a negative electrode 13 and a separator 14 are laminated and wound up.
  • the battery cell 10 is sealed by the exterior material 18.
  • a pair of electrode tabs 11 are connected to the battery cell 10.
  • One electrode tab 11 is a positive electrode tab 11A connected to the positive electrode 12.
  • the other electrode tab 11 is a negative electrode tab 11B connected to the negative electrode 13.
  • the positive electrode tab 11A is made of aluminum.
  • the negative electrode tab 11B is made by plating copper with nickel.
  • the electrode tab 11 is pulled out to the outside of the exterior material 18.
  • a sealant 16 for enhancing the adhesiveness between the electrode tab 11 and the exterior material 18 is provided between the electrode tab 11 and the exterior material 18.
  • a protection circuit board 20 is connected to the battery cell 10.
  • the protection circuit board 20 has a first board 25 and a second board 26.
  • the first substrate 25 is provided with a protection circuit 20A that protects the battery cell 10 from overcharging, overdischarging, and overcurrent.
  • the second substrate 26 is provided with a charge / discharge control circuit 27.
  • the protection circuit 20A includes a protection IC (Integrate Circuit) and a FET.
  • the protection IC converts the current flowing through the battery cell 10 into a voltage by the resistor RSENSE and monitors it. When the protection IC detects an abnormality, the FET stops filling and discharging based on the signals (COUT, DOUT) from the protection IC.
  • the VDD terminal and V-terminal of the protection IC are connected to the electrode tab 11 of the battery cell 10.
  • a resistor R1 and a resistor R2 are connected to the VDD terminal and the V-terminal as a measure against static electricity destruction.
  • a capacitor C1 is connected between the VDD terminal and the VSS terminal of the protection IC.
  • the thermistor 50 is mounted on the first substrate 25.
  • the thermistor 50 detects the temperature in the vicinity of the battery cell 10.
  • the charge / discharge control circuit 27 determines that it is abnormal and stops charging and discharging.
  • the protection circuit board 20 is connected to the positive electrode tab 11A and the negative electrode tab 11B via the insulating sheet 31 and the cushion sheet 32.
  • the insulating sheet 31 is made of an insulating material such as Mylar (a trade name of DuPont).
  • the cushion sheet 32 is made of a flame-retardant material such as Nomex (a trade name of DuPont).
  • the protection circuit board 20 is fixed to the end of the battery cell 10 by the holder 40.
  • the protection circuit board 20 is connected to an external device via the FPC 29.
  • FIGS. 5 and 6 are views showing an example of a method for manufacturing the battery pack 1.
  • the protection circuit board 20 has a board 21 and a pair of connection tabs 22.
  • the substrate 21 has a protection circuit 20A.
  • the connection tab 22 connects the electrode tab 11 to the substrate 21.
  • the connection tab 22 is provided for each electrode tab 11.
  • One connection tab 22 is a positive electrode connection tab 22A connected to the positive electrode tab 11A.
  • the other connection tab 22 is a negative electrode connection tab 22B connected to the negative electrode tab 11B.
  • connection tab 22 When connecting the protection circuit board 20 to the battery cell 10, first, a pair of connection tabs 22 formed in an L shape are prepared.
  • the connection tab 22 is a plate-shaped member bent in an L shape, one end portion sandwiching the bent portion is the first end portion 221 and the other end portion sandwiching the bent portion is the second end. It is part 222.
  • the second surface 22R of the first end portion 221 of the connection tab 22 is connected to the first surface 21F of the substrate 21.
  • the first surface 22F of the second end 222 of the connection tab 22 is connected to the second surface 11R of the electrode tab 11.
  • a connection method a method such as welding is used.
  • the thermistor 50 is placed on the first surface 22F of the first end portion 221 of the positive electrode connection tab 22A.
  • the thermistor 50 has a plate-shaped main body portion BD and a plurality of elongated terminal portions TM drawn from the main body portion BD.
  • the thickness of the main body BD is, for example, 500 ⁇ m.
  • a JT thermistor manufactured by SEMITEC is used as the thermistor 50.
  • the main surface of the thermistor 50 comes into surface contact with the first surface 22F of the first end portion 221 of the positive electrode connection tab 22A. Is placed in. Then, the positive electrode connection tab 22A and the negative electrode connection tab 22B are bent in the direction of the arrow in FIG. As a result, the positive electrode connection tab 22A is bent so that the first surface 22F of the first end portion 221 and the first surface 22F of the second end portion 222 face each other.
  • the main body portion BD is sandwiched between the first surface 22F of the first end portion 221 of the positive electrode connection tab 22A and the first surface 11F of the positive electrode tab 11A.
  • FIG. 6 The upper part of FIG. 6 is a view of the process of FIG. 5 as viewed from above and from the side of the battery cell 10.
  • a terrace portion 10T is formed at the end of the battery cell 10 from which the electrode tab 11 is pulled out.
  • the terrace portion 10T is composed of only the exterior material 18 and the electrode tab 11.
  • the terrace portion 10T is thinner than the other portions on which the positive electrode 12, the negative electrode 13, the separator 14, and the exterior material 18 are laminated. Therefore, a step is formed at the boundary portion of the terrace portion 10T.
  • the L-shaped connection tab 22 is bent 90 ° after being connected to the electrode tab 11 and the substrate 21.
  • the positive electrode connection tab 22A is bent so that the substrate 21 and the positive electrode tab 11A overlap each other.
  • the thermistor 50 is sandwiched between the positive electrode tab 11A and the positive electrode connection tab 22A, and comes into direct contact with the positive electrode tab 11A.
  • the positive electrode tab 11A, the negative electrode tab 11B, the positive electrode connection tab 22A, and the negative electrode connection tab 22B are folded back by 180 °, and a part of the protection circuit board 20 is housed in the terrace portion 10T.
  • the battery pack 1 of the present embodiment has a battery cell 10, a protection circuit board 20, and a thermistor 50.
  • the battery pack 1 has a positive electrode tab 11A made of aluminum.
  • the protection circuit board 20 protects the battery cell 10 from overcharging, overdischarging and overcurrent.
  • the thermistor 50 is in direct contact with the positive electrode tab 11A.
  • the thermistor 50 detects the temperature in the vicinity of the positive electrode tab 11A. Since the aluminum positive electrode tab 11A has a high thermal conductivity, the temperature of the positive electrode tab 11A is substantially the same as the temperature of the battery cell 10. Therefore, the temperature of the battery cell 10 is accurately detected by the thermistor 50.
  • FIG. 7 is a diagram comparing the measured values of the thermistor 50 when a large current is passed through the protection circuit board 20 of the present embodiment with the measured values of the temperatures of the battery cell 10 and the FET.
  • FIG. 8 is a diagram showing an example in which the thermistor is arranged in the vicinity of the FET as a conventional example.
  • FIG. 9 is a diagram comparing the measured value of the thermistor with the measured value of the temperature of the battery cell and the FET in the conventional example.
  • the measured values of the thermistor 50 substantially coincide with the temperatures of the battery cell 10 and the positive electrode tab 11A.
  • the FET has a high temperature
  • the measured value of the thermistor 50 is not greatly affected by the heat of the FET.
  • the conventional example of FIG. 8 since the thermistor is arranged in the vicinity of the FET, the periphery of the thermistor becomes hot due to the heat of the FET. Therefore, as shown in FIG. 9, the measured value of the thermistor is greatly affected by the heat of the FET and deviates from the temperature of the battery cell.
  • the thermistor 50 is less susceptible to the heat of the FET, and the temperature of the battery cell 10 is correctly detected. By controlling charging and discharging using the detection result of the thermistor 50, the battery cell 10 is appropriately protected.
  • the thermistor 50 is sandwiched between the protection circuit board 20 and the positive electrode tab 11A. Therefore, the heat released from the positive electrode tab 11A is trapped in the gap between the positive electrode tab 11A and the protection circuit board 20. Since the heat of the positive electrode tab 11A is not easily dissipated to the outside, the temperature of the positive electrode tab 11A is accurately detected by the thermistor 50.
  • the protection circuit board 20 has a board 21 and a connection tab 22.
  • the substrate 21 has a protection circuit 20A.
  • the connection tab 22 connects the substrate 21 to the positive electrode tab 11A.
  • the connection tab 22 is bent so that the substrate 21 and the positive electrode tab 11A overlap each other.
  • the thermistor 50 is sandwiched between the positive electrode tab 11A and the connection tab 22. According to this configuration, the thermistor 50 can be easily arranged in the vicinity of the positive electrode tab 11A.
  • the positive electrode tab 11A and the negative electrode tab 11B are bent so that at least a part of the protection circuit board 20 overlaps with the end portion (terrace portion 10T) of the battery cell 10. According to this configuration, the protection circuit board 20 is stably held on the battery cell 10. Further, by pressing the protection circuit board 20 toward the battery cell 10, the adhesion between the thermistor 50 and the positive electrode tab 11A is enhanced.
  • FIG. 10 is a schematic view of the battery pack 2 of the second embodiment.
  • the difference between the first embodiment and the first embodiment is that the chip-type thermistor 51 surface-mounted on the substrate 21 is sandwiched between the positive electrode tab 11A and the substrate 21.
  • the thermistor 51 is surface-mounted in the vicinity of the positive electrode connection tab 22A.
  • the mounting position of the thermistor 51 is set so that the positive electrode tab 11A is arranged directly above the thermistor 51 when the positive electrode connection tab 22A is bent.
  • the thickness of the positive electrode connection tab 22A is preferably equal to or less than the thickness of the thermistor 51. This ensures that the thermistor 51 and the positive electrode tab 11A come into contact with each other when the positive electrode connection tab 22A is bent.
  • the positive electrode connection tab 22A and the negative electrode connection tab 22B are bent in the direction of the arrow in FIG.
  • the positive electrode connection tab 22A is bent so that the first surface 22F of the first end portion 221 and the first surface 22F of the second end portion 222 face each other.
  • the thermistor 51 is sandwiched between the substrate 21 and the first surface 11F of the positive electrode tab 11A, and comes into direct contact with the positive electrode tab 11A.
  • the positive electrode tab 11A, the negative electrode tab 11B, the positive electrode connection tab 22A and the negative electrode connection tab 22B are folded back by 180 °, and a part of the protection circuit board 20 is housed in the terrace portion 10T. Will be done.
  • the thermistor 51 is sandwiched between the positive electrode tab 11A and the substrate 21. Even in this configuration, the thermistor 51 can be easily arranged in the vicinity of the positive electrode tab 11A. Therefore, the temperature of the battery cell 10 is accurately detected by the thermistor 51.
  • FIG. 11 is a schematic view of the battery pack 3 of the third embodiment.
  • FIG. 12 is a diagram showing an example of a method for manufacturing the battery pack 3. The difference between the second embodiment and the present embodiment is that the thermistor 51 indirectly contacts the positive electrode tab 11A via the heat conductive member 52.
  • the heat conductive member 52 is arranged in the mounting region of the thermistor 51.
  • the heat conductive member 52 for example, a heat conductive resin containing an epoxy resin or a heat conductive sheet is used.
  • the thickness of the positive electrode connection tab 22A is larger than the thickness of the thermistor 51.
  • the positive electrode connection tab 22A and the negative electrode connection tab 22B are bent in the direction of the arrow in FIG.
  • the positive electrode connection tab 22A is bent so that the first surface 22F of the first end portion 221 and the first surface 22F of the second end portion 222 face each other.
  • the thermistor 51 is sandwiched between the substrate 21 and the first surface 11F of the positive electrode tab 11A, and indirectly contacts the positive electrode tab 11A via the heat conductive member 52.
  • the positive electrode tab 11A, the negative electrode tab 11B, the positive electrode connection tab 22A, and the negative electrode connection tab 22B are folded back by 180 °, and a part of the protection circuit board 20 is housed in the terrace portion 10T.
  • the thermistor 51 indirectly contacts the positive electrode tab 11A via the heat conductive member 52.
  • the heat of the positive electrode tab 11A is surely transferred to the thermistor 51 by arranging the heat conductive member 52 in the gap. Therefore, the temperature of the battery cell 10 is accurately detected by the thermistor 51.
  • FIG. 13 is a schematic view of the battery pack 4 of the fourth embodiment.
  • FIG. 14 is a diagram showing an example of a method for manufacturing the battery pack 4. The difference between the first embodiment and the first embodiment is that the thermistor 50 is not sandwiched between the protection circuit board 20 and the positive electrode tab 11A.
  • the thermistor 50 is arranged on the substrate 21 in such a posture that the orientation of the application portion BD is sideways and the main surface of the main body portion BD is orthogonal to the substrate 21.
  • the positive electrode connection tab 22A and the negative electrode connection tab 22B are bent in the direction of the arrow in FIG.
  • the positive electrode connection tab 22A is bent so that the first surface 22F of the first end portion 221 and the first surface 22F of the second end portion 222 face each other.
  • the thermistor 51 is sandwiched between the substrate 21 and the positive electrode tab 11A while keeping the main surface perpendicular to the substrate 21.
  • the positive electrode tab 11A, the negative electrode tab 11B, the positive electrode connection tab 22A, and the negative electrode connection tab 22B are folded back by 180 °, and a part of the protection circuit board 20 is housed in the terrace portion 10T.
  • the main surface of the thermistor 50 main surface of the main body BD comes into contact with the bent portion of the positive electrode tab 11A.
  • the thermistor 50 is in contact with the positive electrode tab 11A. Therefore, the temperature of the battery cell 10 is accurately detected through the temperature measurement of the positive electrode tab 11A. Further, in the present embodiment, the main surface of the thermistor 50 is not in contact with the protection circuit board 20. Therefore, the heat of the protection circuit 20A (particularly the heat of the FET) is not easily transferred to the thermistor 50 via the protection circuit board 20. Therefore, the measured value of the thermistor 50 is less likely to be affected by the heat of the protection circuit 20A.
  • Battery pack With a thermistor that comes into direct or indirect contact with the positive electrode tab via a heat conductive member, Battery pack with.
  • the protection circuit board includes a board having a protection circuit and a connection tab for connecting the board to the positive electrode tab. The connection tab is bent so that the substrate and the positive electrode tab overlap each other.

Abstract

This battery pack includes a battery cell, a protective circuit substrate, and a thermistor. The battery pack includes an aluminum positive-electrode tab. The protective circuit substrate protects the battery cell from over-charge, over-discharge, and over-current. The thermistor contacts the positive-electrode tab either directly, or indirectly via a heat-conducting member.

Description

電池パックおよび電池パックの製造方法Battery pack and battery pack manufacturing method
　本発明は、電池パックおよび電池パックの製造方法に関する。 The present invention relates to a battery pack and a method for manufacturing a battery pack.
　電池パックには、過充電、過放電および過電流から電池セルを保護するための保護回路が設けられている。保護回路には、異常時に電池セルへの充電電流および放電電流を遮断するためのＦＥＴ（Ｆｉｅｌｄ－Ｅｆｆｅｃｔ　Ｔｒａｎｓｍｉｔｔｅｒ）が設けられている。保護回路が形成された基板には、電池セルの温度を検出するためのサーミスタが実装されている。サーミスタの検出温度が設定範囲を超えると、異常と判断され、充電電流および放電電流が制御される。 The battery pack is equipped with a protection circuit to protect the battery cell from overcharge, overdischarge and overcurrent. The protection circuit is provided with a FET (Field-Effective Transmitter) for cutting off the charge current and the discharge current to the battery cell in the event of an abnormality. A thermistor for detecting the temperature of the battery cell is mounted on the substrate on which the protection circuit is formed. If the detection temperature of the thermistor exceeds the set range, it is determined to be abnormal and the charge current and discharge current are controlled.
特開２０１５－２０２０４６号公報JP-A-2015-202046
　電池セルの容量が大きくなると、ＦＥＴを流れる電流によって大きなジュール熱が発生する。ＦＥＴで発生した熱は、サーミスタの計測結果に悪影響を及ぼす可能性がある。この場合、サーミスタの計測結果に基づいて電池セルの充電および放電を適切に制御することが難しくなる。 When the capacity of the battery cell becomes large, a large Joule heat is generated by the current flowing through the FET. The heat generated by the FET may adversely affect the measurement results of the thermistor. In this case, it becomes difficult to appropriately control the charging and discharging of the battery cell based on the measurement result of the thermistor.
　そこで、本開示では、電池セルの温度を精度よく検出することが可能な電池パックおよびその製造方法を提案する。 Therefore, in the present disclosure, we propose a battery pack capable of accurately detecting the temperature of the battery cell and a method for manufacturing the battery pack.
　本開示によれば、アルミニウム製の正極タブを有する電池セルと、前記電池セルを過充電および過放電から保護する保護回路を有する保護回路基板と、前記正極タブと直接または熱伝導部材を介して間接的に接触するサーミスタと、を有する電池パックおよびその製造方法が提供される。 According to the present disclosure, a battery cell having a positive electrode tab made of aluminum, a protection circuit board having a protection circuit for protecting the battery cell from overcharging and overdischarging, and the positive electrode tab directly or via a heat conductive member. A battery pack having an indirect contact thermista and a method for manufacturing the same are provided.
第１実施形態の電池パックの概略図である。It is a schematic diagram of the battery pack of 1st Embodiment. 電池パックに含まれる電池セルの概略図である。It is a schematic diagram of the battery cell included in a battery pack. 電池パックに含まれる電池セルの概略図である。It is a schematic diagram of the battery cell included in a battery pack. 電池パックに含まれる保護回路基板の概略図である。It is a schematic diagram of the protection circuit board included in a battery pack. 電池パックの製造方法の一例を示す図である。It is a figure which shows an example of the manufacturing method of a battery pack. 電池パックの製造方法の一例を示す図である。It is a figure which shows an example of the manufacturing method of a battery pack. 保護回路基板に大電流を流したときのサーミスタの計測値を電池セルおよびＦＥＴの温度の実測値と比較した図である。It is a figure which compared the measured value of the thermistor when a large current was passed through the protection circuit board with the measured value of the temperature of a battery cell and FET. 従来例として、サーミスタがＦＥＴの近傍に配置された例を示す図である。As a conventional example, it is a figure which shows the example which the thermistor is arranged in the vicinity of a FET. 従来例において、サーミスタの計測値を電池セルおよびＦＥＴの温度の実測値と比較した図である。In the conventional example, it is a figure which compared the measured value of a thermistor with the measured value of the temperature of a battery cell and a FET. 第２実施形態の電池パックの概略図である。It is a schematic diagram of the battery pack of the 2nd Embodiment. 第３実施形態の電池パックの概略図である。It is a schematic diagram of the battery pack of the 3rd Embodiment. 電池パックの製造方法の一例を示す図である。It is a figure which shows an example of the manufacturing method of a battery pack. 第４実施形態の電池パックの概略図である。It is a schematic diagram of the battery pack of the 4th embodiment. 電池パックの製造方法の一例を示す図である。It is a figure which shows an example of the manufacturing method of a battery pack.
　以下に、本開示の実施形態について図面に基づいて詳細に説明する。以下の各実施形態において、同一の部位には同一の符号を付することにより重複する説明を省略する。 Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In each of the following embodiments, the same parts are designated by the same reference numerals, and duplicate description will be omitted.
　なお、説明は以下の順序で行われる。
［１．第１実施形態］
　［１－１．電池パックの構成］
　［１－２．電池パックの製造方法］
　［１－３．効果］
［２．第２実施形態］
［３．第３実施形態］
［４．第４実施形態］ The explanations are given in the following order.
[1. First Embodiment]
[1-1. Battery pack configuration]
[1-2. Battery pack manufacturing method]
[1-3. effect]
[2. Second Embodiment]
[3. Third Embodiment]
[4. Fourth Embodiment]
［１．第１実施形態］
［１－１．電池パックの構成］
　図１は、第１実施形態の電池パック１の概略図である。図２および図３は、電池パック１に含まれる電池セル１０の概略図である。図４は、電池パック１に含まれる保護回路基板２０の概略図である。 [1. First Embodiment]
[1-1. Battery pack configuration]
FIG. 1 is a schematic view of the battery pack 1 of the first embodiment. 2 and 3 are schematic views of the battery cell 10 included in the battery pack 1. FIG. 4 is a schematic view of the protection circuit board 20 included in the battery pack 1.
　図１に示すように、電池パック１は、電池セル１０、保護回路基板２０、ＦＰＣ（Ｆｌｅｘｉｂｌｅ　Ｐｒｉｎｔｅｄ　Ｃｉｒｃｕｉｔｓ）２９、絶縁シート３１、クッションシート３２およびホルダ４０を有する。電池セル１０の表面には、ラベルシール１９が貼り付けられている。 As shown in FIG. 1, the battery pack 1 has a battery cell 10, a protective circuit board 20, an FPC (Flexible Printed Circuits) 29, an insulating sheet 31, a cushion sheet 32, and a holder 40. A label sticker 19 is attached to the surface of the battery cell 10.
　図２および図３に示すように、電池セル１０は、正極１２、負極１３およびセパレータ１４が積層されて巻き取られたものである。電池セル１０は外装材１８によって密封されている。電池セル１０には一対の電極タブ１１が接続されている。一方の電極タブ１１は、正極１２と接続された正極タブ１１Ａである。他方の電極タブ１１は、負極１３に接続された負極タブ１１Ｂである。正極タブ１１Ａは、アルミニウムで作製されている。負極タブ１１Ｂは、銅にニッケルメッキを施して作製されている。電極タブ１１は外装材１８の外側に引き出されている。電極タブ１１と外装材１８との間には、電極タブ１１と外装材１８との接着性を高めるためのシーラント１６が設けられている。 As shown in FIGS. 2 and 3, the battery cell 10 is a battery cell 10 in which a positive electrode 12, a negative electrode 13 and a separator 14 are laminated and wound up. The battery cell 10 is sealed by the exterior material 18. A pair of electrode tabs 11 are connected to the battery cell 10. One electrode tab 11 is a positive electrode tab 11A connected to the positive electrode 12. The other electrode tab 11 is a negative electrode tab 11B connected to the negative electrode 13. The positive electrode tab 11A is made of aluminum. The negative electrode tab 11B is made by plating copper with nickel. The electrode tab 11 is pulled out to the outside of the exterior material 18. A sealant 16 for enhancing the adhesiveness between the electrode tab 11 and the exterior material 18 is provided between the electrode tab 11 and the exterior material 18.
　図４に示すように、電池セル１０には保護回路基板２０が接続されている。保護回路基板２０は、第１基板２５および第２基板２６を有する。第１基板２５には、電池セル１０を過充電、過放電および過電流から保護する保護回路２０Ａが設けられている。第２基板２６には、充放電制御回路２７が設けられている。 As shown in FIG. 4, a protection circuit board 20 is connected to the battery cell 10. The protection circuit board 20 has a first board 25 and a second board 26. The first substrate 25 is provided with a protection circuit 20A that protects the battery cell 10 from overcharging, overdischarging, and overcurrent. The second substrate 26 is provided with a charge / discharge control circuit 27.
　保護回路２０Ａは、保護ＩＣ（Ｉｎｔｅｇｒａｔｅ　Ｃｉｒｃｕｉｔ）およびＦＥＴを含む。保護ＩＣは、抵抗ＲＳＥＮＳＥによって電池セル１０を流れる電流を電圧に変換して監視する。ＦＥＴは、保護ＩＣが異常を検出したときに、保護ＩＣからの信号（ＣＯＵＴ、ＤＯＵＴ）に基づいて充填および放電を停止する。保護ＩＣのＶＤＤ端子とＶ－端子は電池セル１０の電極タブ１１に接続されている。静電気破壊対策のために、ＶＤＤ端子およびＶ－端子には抵抗Ｒ１および抵抗Ｒ２が接続されている。保護ＩＣのＶＤＤ端子とＶＳＳ端子との間にはコンデンサＣ１が接続されている。 The protection circuit 20A includes a protection IC (Integrate Circuit) and a FET. The protection IC converts the current flowing through the battery cell 10 into a voltage by the resistor RSENSE and monitors it. When the protection IC detects an abnormality, the FET stops filling and discharging based on the signals (COUT, DOUT) from the protection IC. The VDD terminal and V-terminal of the protection IC are connected to the electrode tab 11 of the battery cell 10. A resistor R1 and a resistor R2 are connected to the VDD terminal and the V-terminal as a measure against static electricity destruction. A capacitor C1 is connected between the VDD terminal and the VSS terminal of the protection IC.
　第１基板２５には、サーミスタ５０が実装されている。サーミスタ５０は、電池セル１０の近傍の温度を検出する。充放電制御回路２７は、サーミスタ５０の検出温度が設定範囲を超えると、異常と判定し、充電および放電を停止する。 The thermistor 50 is mounted on the first substrate 25. The thermistor 50 detects the temperature in the vicinity of the battery cell 10. When the detection temperature of the thermistor 50 exceeds the set range, the charge / discharge control circuit 27 determines that it is abnormal and stops charging and discharging.
　図１に戻って、保護回路基板２０は、絶縁シート３１およびクッションシート３２を介して正極タブ１１Ａおよび負極タブ１１Ｂと接続されている。絶縁シート３１は、例えば、Ｍｙｌａｒ（デュポン社の商品名）などの絶縁材料で形成されている。クッションシート３２は、例えば、Ｎｏｍｅｘ（デュポン社の商品名）などの難燃性材料で形成されている。保護回路基板２０は、ホルダ４０によって電池セル１０の端部に固定されている。保護回路基板２０は、ＦＰＣ２９を介して外部機器と接続される。 Returning to FIG. 1, the protection circuit board 20 is connected to the positive electrode tab 11A and the negative electrode tab 11B via the insulating sheet 31 and the cushion sheet 32. The insulating sheet 31 is made of an insulating material such as Mylar (a trade name of DuPont). The cushion sheet 32 is made of a flame-retardant material such as Nomex (a trade name of DuPont). The protection circuit board 20 is fixed to the end of the battery cell 10 by the holder 40. The protection circuit board 20 is connected to an external device via the FPC 29.
［１－２．電池パックの製造方法］
　図５および図６は、電池パック１の製造方法の一例を示す図である。 [1-2. Battery pack manufacturing method]
5 and 6 are views showing an example of a method for manufacturing the battery pack 1.
　図５に示すように、保護回路基板２０は、基板２１と、一対の接続タブ２２と、を有する。基板２１は、保護回路２０Ａを有する。接続タブ２２は、電極タブ１１を基板２１と接続する。接続タブ２２は、電極タブ１１ごとに設けられている。一方の接続タブ２２は、正極タブ１１Ａと接続される正極接続タブ２２Ａである。他方の接続タブ２２は、負極タブ１１Ｂと接続される負極接続タブ２２Ｂである。 As shown in FIG. 5, the protection circuit board 20 has a board 21 and a pair of connection tabs 22. The substrate 21 has a protection circuit 20A. The connection tab 22 connects the electrode tab 11 to the substrate 21. The connection tab 22 is provided for each electrode tab 11. One connection tab 22 is a positive electrode connection tab 22A connected to the positive electrode tab 11A. The other connection tab 22 is a negative electrode connection tab 22B connected to the negative electrode tab 11B.
　保護回路基板２０を電池セル１０と接続するにあたって、まず、Ｌ字状に形成された一対の接続タブ２２が用意される。接続タブ２２は、Ｌ字状に屈曲した板状部材であり、屈曲部を挟んだ一方の端部が第１端部２２１となっており、屈曲部を挟んだ他方の端部が第２端部２２２となっている。基板２１の第１面２１Ｆには接続タブ２２の第１端部２２１の第２面２２Ｒが接続される。電極タブ１１の第２面１１Ｒには接続タブ２２の第２端部２２２の第１面２２Ｆが接続される。接続方法は、溶接などの方法が用いられる。 When connecting the protection circuit board 20 to the battery cell 10, first, a pair of connection tabs 22 formed in an L shape are prepared. The connection tab 22 is a plate-shaped member bent in an L shape, one end portion sandwiching the bent portion is the first end portion 221 and the other end portion sandwiching the bent portion is the second end. It is part 222. The second surface 22R of the first end portion 221 of the connection tab 22 is connected to the first surface 21F of the substrate 21. The first surface 22F of the second end 222 of the connection tab 22 is connected to the second surface 11R of the electrode tab 11. As a connection method, a method such as welding is used.
　次に、サーミスタ５０が正極接続タブ２２Ａの第１端部２２１の第１面２２Ｆ上に載置される。サーミスタ５０は、板状の本体部ＢＤと、本体部ＢＤから引き出された複数の細長い端子部ＴＭと、を有する。本体部ＢＤの厚みは例えば５００μｍである。サーミスタ５０としては、例えば、ＳＥＭＩＴＥＣ社製のＪＴサーミスタが用いられる。 Next, the thermistor 50 is placed on the first surface 22F of the first end portion 221 of the positive electrode connection tab 22A. The thermistor 50 has a plate-shaped main body portion BD and a plurality of elongated terminal portions TM drawn from the main body portion BD. The thickness of the main body BD is, for example, 500 μm. As the thermistor 50, for example, a JT thermistor manufactured by SEMITEC is used.
　サーミスタ５０は、端子部ＴＭが基板２１に実装された後、サーミスタ５０の主面（本体部ＢＤの主面）が正極接続タブ２２Ａの第１端部２２１の第１面２２Ｆと面接触するように配置される。そして、正極接続タブ２２Ａおよび負極接続タブ２２Ｂが図５の矢印の方向に折り曲げられる。これにより、正極接続タブ２２Ａは、第１端部２２１の第１面２２Ｆと第２端部２２２の第１面２２Ｆとが向かい合うように屈曲する。本体部ＢＤは、正極接続タブ２２Ａの第１端部２２１の第１面２２Ｆと正極タブ１１Ａの第１面１１Ｆとの間に挟まれる。 In the thermistor 50, after the terminal portion TM is mounted on the substrate 21, the main surface of the thermistor 50 (main surface of the main body portion BD) comes into surface contact with the first surface 22F of the first end portion 221 of the positive electrode connection tab 22A. Is placed in. Then, the positive electrode connection tab 22A and the negative electrode connection tab 22B are bent in the direction of the arrow in FIG. As a result, the positive electrode connection tab 22A is bent so that the first surface 22F of the first end portion 221 and the first surface 22F of the second end portion 222 face each other. The main body portion BD is sandwiched between the first surface 22F of the first end portion 221 of the positive electrode connection tab 22A and the first surface 11F of the positive electrode tab 11A.
　図６の上段は、図５の処理を電池セル１０の上方および側方から見た図である。電極タブ１１が引き出された電池セル１０の端部にはテラス部１０Ｔが形成されている。テラス部１０Ｔは外装材１８と電極タブ１１のみで構成されている。テラス部１０Ｔは、正極１２、負極１３、セパレータ１４および外装材１８が積層された他の部分よりも厚みが薄い。そのため、テラス部１０Ｔの境界部には段差が形成されている。 The upper part of FIG. 6 is a view of the process of FIG. 5 as viewed from above and from the side of the battery cell 10. A terrace portion 10T is formed at the end of the battery cell 10 from which the electrode tab 11 is pulled out. The terrace portion 10T is composed of only the exterior material 18 and the electrode tab 11. The terrace portion 10T is thinner than the other portions on which the positive electrode 12, the negative electrode 13, the separator 14, and the exterior material 18 are laminated. Therefore, a step is formed at the boundary portion of the terrace portion 10T.
　図５に示したように、Ｌ字状の接続タブ２２は、電極タブ１１および基板２１と接続された後、９０°折り曲げられる。これにより、図６の中段に示すように、正極接続タブ２２Ａは、基板２１と正極タブ１１Ａとが重畳するように屈曲する。サーミスタ５０は、正極タブ１１Ａと正極接続タブ２２Ａとの間に挟まれ、正極タブ１１Ａと直接接触する。次に、図６の下段に示すように、正極タブ１１Ａ、負極タブ１１Ｂ、正極接続タブ２２Ａおよび負極接続タブ２２Ｂが１８０°折り返されて、保護回路基板２０の一部がテラス部１０Ｔに収容される。 As shown in FIG. 5, the L-shaped connection tab 22 is bent 90 ° after being connected to the electrode tab 11 and the substrate 21. As a result, as shown in the middle of FIG. 6, the positive electrode connection tab 22A is bent so that the substrate 21 and the positive electrode tab 11A overlap each other. The thermistor 50 is sandwiched between the positive electrode tab 11A and the positive electrode connection tab 22A, and comes into direct contact with the positive electrode tab 11A. Next, as shown in the lower part of FIG. 6, the positive electrode tab 11A, the negative electrode tab 11B, the positive electrode connection tab 22A, and the negative electrode connection tab 22B are folded back by 180 °, and a part of the protection circuit board 20 is housed in the terrace portion 10T. To.
［１－３．効果］
　本実施形態の電池パック１は、電池セル１０と保護回路基板２０とサーミスタ５０とを有する。電池パック１は、アルミニウム製の正極タブ１１Ａを有する。保護回路基板２０は、電池セル１０を過充電、過放電および過電流から保護する。サーミスタ５０は、正極タブ１１Ａと直接接触する。 [1-3. effect]
The battery pack 1 of the present embodiment has a battery cell 10, a protection circuit board 20, and a thermistor 50. The battery pack 1 has a positive electrode tab 11A made of aluminum. The protection circuit board 20 protects the battery cell 10 from overcharging, overdischarging and overcurrent. The thermistor 50 is in direct contact with the positive electrode tab 11A.
　この構成によれば、サーミスタ５０によって正極タブ１１Ａの近傍の温度が検出される。アルミニウム製の正極タブ１１Ａは熱伝導率が高いため、正極タブ１１Ａの温度は電池セル１０の温度と概ね一致する。よって、電池セル１０の温度はサーミスタ５０によって精度よく検出される。 According to this configuration, the thermistor 50 detects the temperature in the vicinity of the positive electrode tab 11A. Since the aluminum positive electrode tab 11A has a high thermal conductivity, the temperature of the positive electrode tab 11A is substantially the same as the temperature of the battery cell 10. Therefore, the temperature of the battery cell 10 is accurately detected by the thermistor 50.
　図７は、本実施形態の保護回路基板２０に大電流を流したときのサーミスタ５０の計測値を電池セル１０およびＦＥＴの温度の実測値と比較した図である。図８は、従来例として、サーミスタがＦＥＴの近傍に配置された例を示す図である。図９は、従来例において、サーミスタの計測値を電池セルおよびＦＥＴの温度の実測値と比較した図である。 FIG. 7 is a diagram comparing the measured values of the thermistor 50 when a large current is passed through the protection circuit board 20 of the present embodiment with the measured values of the temperatures of the battery cell 10 and the FET. FIG. 8 is a diagram showing an example in which the thermistor is arranged in the vicinity of the FET as a conventional example. FIG. 9 is a diagram comparing the measured value of the thermistor with the measured value of the temperature of the battery cell and the FET in the conventional example.
　図７に示すように、本実施形態の電池パック１では、サーミスタ５０の計測値は電池セル１０および正極タブ１１Ａの温度と概ね一致する。ＦＥＴは高温となっているが、サーミスタ５０の計測値はＦＥＴの熱によって大きな影響を受けない。これに対して、図８の従来例では、サーミスタがＦＥＴの近傍に配置されるため、サーミスタの周辺はＦＥＴの熱によって熱くなる。そのため、図９に示すように、サーミスタの計測値はＦＥＴの熱によって大きな影響を受け、電池セルの温度から乖離する。 As shown in FIG. 7, in the battery pack 1 of the present embodiment, the measured values of the thermistor 50 substantially coincide with the temperatures of the battery cell 10 and the positive electrode tab 11A. Although the FET has a high temperature, the measured value of the thermistor 50 is not greatly affected by the heat of the FET. On the other hand, in the conventional example of FIG. 8, since the thermistor is arranged in the vicinity of the FET, the periphery of the thermistor becomes hot due to the heat of the FET. Therefore, as shown in FIG. 9, the measured value of the thermistor is greatly affected by the heat of the FET and deviates from the temperature of the battery cell.
　このように、本実施形態では、サーミスタ５０がＦＥＴの熱のあおりを受けにくく、正しく電池セル１０の温度が検出される。サーミスタ５０の検出結果を用いて充電および放電が制御されることにより、電池セル１０が適切に保護される。 As described above, in the present embodiment, the thermistor 50 is less susceptible to the heat of the FET, and the temperature of the battery cell 10 is correctly detected. By controlling charging and discharging using the detection result of the thermistor 50, the battery cell 10 is appropriately protected.
　本実施形態では、サーミスタ５０は、保護回路基板２０と正極タブ１１Ａとの間に挟まれている。そのため、正極タブ１１Ａから放出された熱が、正極タブ１１Ａと保護回路基板２０との間の隙間に籠もる。正極タブ１１Ａの熱が外部に散逸しにくいため、サーミスタ５０によって正極タブ１１Ａの温度が精度よく検出される。 In this embodiment, the thermistor 50 is sandwiched between the protection circuit board 20 and the positive electrode tab 11A. Therefore, the heat released from the positive electrode tab 11A is trapped in the gap between the positive electrode tab 11A and the protection circuit board 20. Since the heat of the positive electrode tab 11A is not easily dissipated to the outside, the temperature of the positive electrode tab 11A is accurately detected by the thermistor 50.
　保護回路基板２０は、基板２１と接続タブ２２とを有する。基板２１は、保護回路２０Ａを有する。接続タブ２２は、基板２１を正極タブ１１Ａと接続する。接続タブ２２は、基板２１と正極タブ１１Ａとが重畳するように屈曲している。サーミスタ５０は、正極タブ１１Ａと接続タブ２２との間に挟まれている。この構成によれば、サーミスタ５０を容易に正極タブ１１Ａの近傍に配置することができる。 The protection circuit board 20 has a board 21 and a connection tab 22. The substrate 21 has a protection circuit 20A. The connection tab 22 connects the substrate 21 to the positive electrode tab 11A. The connection tab 22 is bent so that the substrate 21 and the positive electrode tab 11A overlap each other. The thermistor 50 is sandwiched between the positive electrode tab 11A and the connection tab 22. According to this configuration, the thermistor 50 can be easily arranged in the vicinity of the positive electrode tab 11A.
　正極タブ１１Ａおよび負極タブ１１Ｂは、保護回路基板２０の少なくとも一部が電池セル１０の端部（テラス部１０Ｔ）と重畳するように屈曲している。この構成によれば、保護回路基板２０が電池セル１０上に安定的に保持される。また、保護回路基板２０が電池セル１０に向けて押し付けられることにより、サーミスタ５０と正極タブ１１Ａとの密着性が高まる。 The positive electrode tab 11A and the negative electrode tab 11B are bent so that at least a part of the protection circuit board 20 overlaps with the end portion (terrace portion 10T) of the battery cell 10. According to this configuration, the protection circuit board 20 is stably held on the battery cell 10. Further, by pressing the protection circuit board 20 toward the battery cell 10, the adhesion between the thermistor 50 and the positive electrode tab 11A is enhanced.
［２．第２実施形態］
　図１０は、第２実施形態の電池パック２の概略図である。本実施形態において第１実施形態と異なる点は、基板２１に面実装されたチップ型のサーミスタ５１が正極タブ１１Ａと基板２１との間に挟まれる点である。 [2. Second Embodiment]
FIG. 10 is a schematic view of the battery pack 2 of the second embodiment. The difference between the first embodiment and the first embodiment is that the chip-type thermistor 51 surface-mounted on the substrate 21 is sandwiched between the positive electrode tab 11A and the substrate 21.
　サーミスタ５１は、正極接続タブ２２Ａの近傍に面実装される。サーミスタ５１の実装位置は、正極接続タブ２２Ａが折り曲げられたときにサーミスタ５１の真上に正極タブ１１Ａが配置されるような位置に設定される。正極接続タブ２２Ａの厚みは、サーミスタ５１の厚み以下であることが好ましい。これにより、正極接続タブ２２Ａが折り曲げられたときに、サーミスタ５１と正極タブ１１Ａとが確実に接触する。 The thermistor 51 is surface-mounted in the vicinity of the positive electrode connection tab 22A. The mounting position of the thermistor 51 is set so that the positive electrode tab 11A is arranged directly above the thermistor 51 when the positive electrode connection tab 22A is bent. The thickness of the positive electrode connection tab 22A is preferably equal to or less than the thickness of the thermistor 51. This ensures that the thermistor 51 and the positive electrode tab 11A come into contact with each other when the positive electrode connection tab 22A is bent.
　サーミスタ５１が基板２１上に面実装された後、正極接続タブ２２Ａおよび負極接続タブ２２Ｂは図１０の矢印の方向に折り曲げられる。これにより、正極接続タブ２２Ａは、第１端部２２１の第１面２２Ｆと第２端部２２２の第１面２２Ｆとが向かい合うように屈曲する。サーミスタ５１は、基板２１と正極タブ１１Ａの第１面１１Ｆとの間に挟まれ、正極タブ１１Ａと直接接触する。以降は、図６の下段に示したように、正極タブ１１Ａ、負極タブ１１Ｂ、正極接続タブ２２Ａおよび負極接続タブ２２Ｂが１８０°折り返されて、保護回路基板２０の一部がテラス部１０Ｔに収容される。 After the thermistor 51 is surface-mounted on the substrate 21, the positive electrode connection tab 22A and the negative electrode connection tab 22B are bent in the direction of the arrow in FIG. As a result, the positive electrode connection tab 22A is bent so that the first surface 22F of the first end portion 221 and the first surface 22F of the second end portion 222 face each other. The thermistor 51 is sandwiched between the substrate 21 and the first surface 11F of the positive electrode tab 11A, and comes into direct contact with the positive electrode tab 11A. After that, as shown in the lower part of FIG. 6, the positive electrode tab 11A, the negative electrode tab 11B, the positive electrode connection tab 22A and the negative electrode connection tab 22B are folded back by 180 °, and a part of the protection circuit board 20 is housed in the terrace portion 10T. Will be done.
　以上のように、本実施形態では、サーミスタ５１は正極タブ１１Ａと基板２１との間に挟まれる。この構成でも、サーミスタ５１を容易に正極タブ１１Ａの近傍に配置することができる。よって、電池セル１０の温度がサーミスタ５１によって精度よく検出される。 As described above, in the present embodiment, the thermistor 51 is sandwiched between the positive electrode tab 11A and the substrate 21. Even in this configuration, the thermistor 51 can be easily arranged in the vicinity of the positive electrode tab 11A. Therefore, the temperature of the battery cell 10 is accurately detected by the thermistor 51.
［３．第３実施形態］
　図１１は、第３実施形態の電池パック３の概略図である。図１２は、電池パック３の製造方法の一例を示す図である。本実施形態において第２実施形態と異なる点は、サーミスタ５１が正極タブ１１Ａと熱伝導部材５２を介して間接的に接触する点である。 [3. Third Embodiment]
FIG. 11 is a schematic view of the battery pack 3 of the third embodiment. FIG. 12 is a diagram showing an example of a method for manufacturing the battery pack 3. The difference between the second embodiment and the present embodiment is that the thermistor 51 indirectly contacts the positive electrode tab 11A via the heat conductive member 52.
　図１１に示すように、本実施形態では、サーミスタ５１が基板２１上に面実装された後、熱伝導部材５２がサーミスタ５１の実装領域に配置される。熱伝導部材５２としては、例えば、エポキシ樹脂を含む熱伝導樹脂または熱伝導シートが用いられる。正極接続タブ２２Ａの厚みは、サーミスタ５１の厚みよりも大きい。正極接続タブ２２Ａが折り曲げられたときに、サーミスタ５１と正極タブ１１Ａとの間には隙間が生じるが、熱伝導部材５２がこの隙間に充填され、サーミスタ５１と正極タブ１１Ａとを熱的に結合させる。 As shown in FIG. 11, in the present embodiment, after the thermistor 51 is surface-mounted on the substrate 21, the heat conductive member 52 is arranged in the mounting region of the thermistor 51. As the heat conductive member 52, for example, a heat conductive resin containing an epoxy resin or a heat conductive sheet is used. The thickness of the positive electrode connection tab 22A is larger than the thickness of the thermistor 51. When the positive electrode connection tab 22A is bent, a gap is created between the thermistor 51 and the positive electrode tab 11A, but the heat conductive member 52 is filled in this gap, and the thermistor 51 and the positive electrode tab 11A are thermally coupled. Let me.
　サーミスタ５１の実装位置に熱伝導部材５２が配置された後、正極接続タブ２２Ａおよび負極接続タブ２２Ｂが図１１の矢印の方向に折り曲げられる。これにより、図１２の中段に示すように、正極接続タブ２２Ａは、第１端部２２１の第１面２２Ｆと第２端部２２２の第１面２２Ｆとが向かい合うように屈曲する。サーミスタ５１は、基板２１と正極タブ１１Ａの第１面１１Ｆとの間に挟まれ、正極タブ１１Ａと熱伝導部材５２を介して間接的に接触する。次に、図１２の下段に示すように、正極タブ１１Ａ、負極タブ１１Ｂ、正極接続タブ２２Ａおよび負極接続タブ２２Ｂが１８０°折り返されて、保護回路基板２０の一部がテラス部１０Ｔに収容される。 After the heat conductive member 52 is arranged at the mounting position of the thermistor 51, the positive electrode connection tab 22A and the negative electrode connection tab 22B are bent in the direction of the arrow in FIG. As a result, as shown in the middle part of FIG. 12, the positive electrode connection tab 22A is bent so that the first surface 22F of the first end portion 221 and the first surface 22F of the second end portion 222 face each other. The thermistor 51 is sandwiched between the substrate 21 and the first surface 11F of the positive electrode tab 11A, and indirectly contacts the positive electrode tab 11A via the heat conductive member 52. Next, as shown in the lower part of FIG. 12, the positive electrode tab 11A, the negative electrode tab 11B, the positive electrode connection tab 22A, and the negative electrode connection tab 22B are folded back by 180 °, and a part of the protection circuit board 20 is housed in the terrace portion 10T. To.
　以上のように、本実施形態では、サーミスタ５１は、正極タブ１１Ａと熱伝導部材５２を介して間接的に接触する．この構成では、サーミスタ５１と正極タブ１１Ａとの間に隙間が生じても、隙間に熱伝導部材５２が配置されることで、正極タブ１１Ａの熱が確実にサーミスタ５１に伝達される。よって、電池セル１０の温度がサーミスタ５１によって精度よく検出される。 As described above, in the present embodiment, the thermistor 51 indirectly contacts the positive electrode tab 11A via the heat conductive member 52. In this configuration, even if a gap is generated between the thermistor 51 and the positive electrode tab 11A, the heat of the positive electrode tab 11A is surely transferred to the thermistor 51 by arranging the heat conductive member 52 in the gap. Therefore, the temperature of the battery cell 10 is accurately detected by the thermistor 51.
［４．第４実施形態］
　図１３は、第４実施形態の電池パック４の概略図である。図１４は、電池パック４の製造方法の一例を示す図である。本実施形態において第１実施形態と異なる点は、サーミスタ５０が保護回路基板２０と正極タブ１１Ａとの間に挟まれていない点である。 [4. Fourth Embodiment]
FIG. 13 is a schematic view of the battery pack 4 of the fourth embodiment. FIG. 14 is a diagram showing an example of a method for manufacturing the battery pack 4. The difference between the first embodiment and the first embodiment is that the thermistor 50 is not sandwiched between the protection circuit board 20 and the positive electrode tab 11A.
　図１３に示すように、本実施形態では、サーミスタ５０が本願部ＢＤの向きを横向きにし且つ本体部ＢＤの主面が基板２１と直交するような姿勢で基板２１上に配置される。この状態で、正極接続タブ２２Ａおよび負極接続タブ２２Ｂが図１３の矢印の方向に折り曲げられる。これにより、図１４の中段に示すように、正極接続タブ２２Ａは、第１端部２２１の第１面２２Ｆと第２端部２２２の第１面２２Ｆとが向かい合うように屈曲する。サーミスタ５１は、主面が基板２１に垂直な状態を保ったまま基板２１と正極タブ１１Ａとの間に挟まれる。 As shown in FIG. 13, in the present embodiment, the thermistor 50 is arranged on the substrate 21 in such a posture that the orientation of the application portion BD is sideways and the main surface of the main body portion BD is orthogonal to the substrate 21. In this state, the positive electrode connection tab 22A and the negative electrode connection tab 22B are bent in the direction of the arrow in FIG. As a result, as shown in the middle of FIG. 14, the positive electrode connection tab 22A is bent so that the first surface 22F of the first end portion 221 and the first surface 22F of the second end portion 222 face each other. The thermistor 51 is sandwiched between the substrate 21 and the positive electrode tab 11A while keeping the main surface perpendicular to the substrate 21.
　次に、図１４の下段に示すように、正極タブ１１Ａ、負極タブ１１Ｂ、正極接続タブ２２Ａおよび負極接続タブ２２Ｂが１８０°折り返されて、保護回路基板２０の一部がテラス部１０Ｔに収容される。この折り返し処理によって、サーミスタ５０の主面（本体部ＢＤの主面）が、正極タブ１１Ａの屈曲部と接触する。 Next, as shown in the lower part of FIG. 14, the positive electrode tab 11A, the negative electrode tab 11B, the positive electrode connection tab 22A, and the negative electrode connection tab 22B are folded back by 180 °, and a part of the protection circuit board 20 is housed in the terrace portion 10T. To. By this folding process, the main surface of the thermistor 50 (main surface of the main body BD) comes into contact with the bent portion of the positive electrode tab 11A.
　この構成においても、サーミスタ５０は正極タブ１１Ａと接触する。そのため、正極タブ１１Ａの温度計測を通じて、電池セル１０の温度が精度よく検出される。また、本実施形態では、サーミスタ５０の主面は保護回路基板２０と接触していない。そのため、保護回路２０Ａの熱（特にＦＥＴの熱）が保護回路基板２０を介してサーミスタ５０に伝わりにくい。よって、サーミスタ５０の計測値が保護回路２０Ａの熱によって影響を受けにくくなる。 Even in this configuration, the thermistor 50 is in contact with the positive electrode tab 11A. Therefore, the temperature of the battery cell 10 is accurately detected through the temperature measurement of the positive electrode tab 11A. Further, in the present embodiment, the main surface of the thermistor 50 is not in contact with the protection circuit board 20. Therefore, the heat of the protection circuit 20A (particularly the heat of the FET) is not easily transferred to the thermistor 50 via the protection circuit board 20. Therefore, the measured value of the thermistor 50 is less likely to be affected by the heat of the protection circuit 20A.
　なお、本明細書に記載された効果はあくまで例示であって限定されるものでは無く、また他の効果があってもよい。 It should be noted that the effects described in the present specification are merely examples and are not limited, and other effects may be obtained.
　なお、本技術は以下のような構成も取ることができる。 Note that this technology can also take the following configurations.
（１）
　アルミニウム製の正極タブを有する電池セルと、
　前記電池セルを過充電、過放電および過電流から保護する保護回路基板と、
　前記正極タブと直接または熱伝導部材を介して間接的に接触するサーミスタと、
　を有する電池パック。
（２）
　前記サーミスタは、前記保護回路基板と前記正極タブとの間に挟まれている
　上記（１）に記載の電池パック。
（３）
　前記保護回路基板は、保護回路を有する基板と、前記基板を前記正極タブと接続する接続タブと、を有し、
　前記接続タブは、前記基板と前記正極タブとが重畳するように屈曲しており、
　前記サーミスタは、前記正極タブと前記基板または前記接続タブとの間に挟まれている
　上記（２）に記載の電池パック。
（４）
　前記正極タブは、前記保護回路基板の少なくとも一部が前記電池セルの端部と重畳するように屈曲している
　上記（２）または（３）に記載の電池パック。
（５）
　前記正極タブは、前記保護回路基板の少なくとも一部が前記電池セルの端部と重畳するように屈曲しており、
　前記サーミスタの主面は、前記正極タブの屈曲部と接触している
　上記（１）に記載の電池パック。
（６）
　電池セルを過充電、過放電および過電流から保護する保護回路基板にサーミスタを実装するステップと、
　前記サーミスタを、前記電池セルに設けられたアルミニウム製の正極タブと直接または熱伝導部材を介して間接的に接触させて固定するステップと、
　を有する電池パックの製造方法。 (1)
A battery cell with a positive electrode tab made of aluminum and
A protection circuit board that protects the battery cells from overcharging, overdischarging, and overcurrent.
With a thermistor that comes into direct or indirect contact with the positive electrode tab via a heat conductive member,
Battery pack with.
(2)
The battery pack according to (1) above, wherein the thermistor is sandwiched between the protection circuit board and the positive electrode tab.
(3)
The protection circuit board includes a board having a protection circuit and a connection tab for connecting the board to the positive electrode tab.
The connection tab is bent so that the substrate and the positive electrode tab overlap each other.
The battery pack according to (2) above, wherein the thermistor is sandwiched between the positive electrode tab and the substrate or the connection tab.
(4)
The battery pack according to (2) or (3) above, wherein the positive electrode tab is bent so that at least a part of the protection circuit board overlaps with the end portion of the battery cell.
(5)
The positive electrode tab is bent so that at least a part of the protection circuit board overlaps with the end portion of the battery cell.
The battery pack according to (1) above, wherein the main surface of the thermistor is in contact with the bent portion of the positive electrode tab.
(6)
The steps to mount the thermistor on a protective circuit board that protects the battery cells from overcharging, overdischarging and overcurrent,
A step of directly or indirectly contacting and fixing the thermistor with an aluminum positive electrode tab provided in the battery cell via a heat conductive member, and a step of fixing the thermistor.
How to manufacture a battery pack with.
１，２，３，４　電池パック
１０　電池セル
１１Ａ　正極タブ
２０　保護回路基板
２１　基板
２２　接続タブ
５０，５１　サーミスタ
５２　熱伝導部材 1, 2, 3, 4 Battery pack 10 Battery cell 11A Positive electrode tab 20 Protection circuit board 21 Board 22 Connection tab 50, 51 Thermistor 52 Heat conductive member

Claims (6)

  1. 　アルミニウム製の正極タブを有する電池セルと、
    　前記電池セルを過充電、過放電および過電流から保護する保護回路基板と、
    　前記正極タブと直接または熱伝導部材を介して間接的に接触するサーミスタと、
    　を有する電池パック。     A battery cell with a positive electrode tab made of aluminum and
    A protection circuit board that protects the battery cells from overcharging, overdischarging, and overcurrent.
    With a thermistor that comes into direct or indirect contact with the positive electrode tab via a heat conductive member,
    Battery pack with.
  2. 　前記サーミスタは、前記保護回路基板と前記正極タブとの間に挟まれている
    　請求項１に記載の電池パック。     The battery pack according to claim 1, wherein the thermistor is sandwiched between the protection circuit board and the positive electrode tab.
  3. 　前記保護回路基板は、保護回路を有する基板と、前記基板を前記正極タブと接続する接続タブと、を有し、
    　前記接続タブは、前記基板と前記正極タブとが重畳するように屈曲しており、
    　前記サーミスタは、前記正極タブと前記基板または前記接続タブとの間に挟まれている
    　請求項２に記載の電池パック。     The protection circuit board includes a board having a protection circuit and a connection tab for connecting the board to the positive electrode tab.
    The connection tab is bent so that the substrate and the positive electrode tab overlap each other.
    The battery pack according to claim 2, wherein the thermistor is sandwiched between the positive electrode tab and the substrate or the connection tab.
  4. 　前記正極タブは、前記保護回路基板の少なくとも一部が前記電池セルの端部と重畳するように屈曲している
    　請求項２に記載の電池パック。     The battery pack according to claim 2, wherein the positive electrode tab is bent so that at least a part of the protection circuit board overlaps with the end portion of the battery cell.
  5. 　前記正極タブは、前記保護回路基板の少なくとも一部が前記電池セルの端部と重畳するように屈曲しており、
    　前記サーミスタの主面は、前記正極タブの屈曲部と接触している
    　請求項１に記載の電池パック。     The positive electrode tab is bent so that at least a part of the protection circuit board overlaps with the end portion of the battery cell.
    The battery pack according to claim 1, wherein the main surface of the thermistor is in contact with a bent portion of the positive electrode tab.
  6. 　電池セルを過充電、過放電および過電流から保護する保護回路基板にサーミスタを実装するステップと、
    　前記サーミスタを、前記電池セルに設けられたアルミニウム製の正極タブと直接または熱伝導部材を介して間接的に接触させて固定するステップと、
    　を有する電池パックの製造方法。     The steps to mount the thermistor on a protective circuit board that protects the battery cells from overcharging, overdischarging and overcurrent,
    A step of directly or indirectly contacting and fixing the thermistor with an aluminum positive electrode tab provided in the battery cell via a heat conductive member, and a step of fixing the thermistor.
    How to manufacture a battery pack with.
PCT/JP2020/026899 2020-07-09 2020-07-09 Battery pack and method for manufacturing battery pack WO2022009396A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006040623A (en) * 2004-07-23 2006-02-09 Sony Corp Battery pack
US20130143084A1 (en) * 2011-12-02 2013-06-06 Jae-won Kim Rechargeable battery pack
JP2014503943A (en) * 2010-11-30 2014-02-13 バイエリッシェ モートーレン ウエルケ アクチエンゲゼルシャフト Device for detecting the temperature of an energy storage device
US20150044511A1 (en) * 2013-08-08 2015-02-12 Samsung Sdi Co., Ltd. Battery pack

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006040623A (en) * 2004-07-23 2006-02-09 Sony Corp Battery pack
JP2014503943A (en) * 2010-11-30 2014-02-13 バイエリッシェ モートーレン ウエルケ アクチエンゲゼルシャフト Device for detecting the temperature of an energy storage device
US20130143084A1 (en) * 2011-12-02 2013-06-06 Jae-won Kim Rechargeable battery pack
US20150044511A1 (en) * 2013-08-08 2015-02-12 Samsung Sdi Co., Ltd. Battery pack

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