JP7221344B2 - battery pack - Google Patents

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Publication number
JP7221344B2
JP7221344B2 JP2021130728A JP2021130728A JP7221344B2 JP 7221344 B2 JP7221344 B2 JP 7221344B2 JP 2021130728 A JP2021130728 A JP 2021130728A JP 2021130728 A JP2021130728 A JP 2021130728A JP 7221344 B2 JP7221344 B2 JP 7221344B2
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battery
wiring board
battery pack
board
housing
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JP2021180190A (en
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裕明 田村
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Envision AESC Japan Ltd
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Envision AESC Japan Ltd
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    • 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

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Description

本発明は、電池パックの内部構造に関する。 The present invention relates to the internal structure of a battery pack.

電池パックの内部構造に関する技術の一例が、例えば、下記特許文献１および特許文献２等に開示されている。下記特許文献１では、角型電池の外周部に燐片状の切り込みを一律に設け、当該切り込みを外装ケース側に起こす構造が開示されている。この構成によれば、角型電池に均等に圧力をかけることが可能となる。また、特許文献２には、電池パック内に電池と当該電池に接続された回路基板とを含む構造が開示されている。 Examples of technologies related to the internal structure of a battery pack are disclosed in, for example, Patent Documents 1 and 2 listed below. Patent Literature 1 below discloses a structure in which scaly cuts are uniformly formed in the outer peripheral portion of a prismatic battery, and the cuts are raised toward the exterior case. According to this configuration, it is possible to uniformly apply pressure to the rectangular battery. Further, Patent Document 2 discloses a structure including a battery and a circuit board connected to the battery in a battery pack.

実開平０６－０５６９６３号公報Japanese Utility Model Laid-Open No. 06-056963 特開２００９－０８７５５５号公報JP 2009-087555 A

電池パックの内部構造は、一般に二次電池を含む電池部と、制御用の電子回路を搭載する基板部とに分けられる。この場合において、基板部は、配線基板と当該配線基板を保護する収容プレートを有していることがある。この収容プレートは、絶縁及び防水のために設けられている。電池パックの内部の部品は、収容プレートと他の部品の間に挟持されることがある。本発明者が検討した結果、収容プレートの形状によっては、電池部に圧力がかかる部分とかからない部分が生じてしまうことが判明した。 The internal structure of a battery pack is generally divided into a battery section containing a secondary battery and a board section on which electronic circuits for control are mounted. In this case, the substrate part may have a wiring board and a housing plate that protects the wiring board. This containing plate is provided for insulation and waterproofing. Components inside the battery pack may be sandwiched between the containing plate and other components. As a result of investigations by the present inventors, it was found that depending on the shape of the housing plate, there are portions where pressure is applied to the battery portion and portions where pressure is not applied.

本発明の目的は、電池パック内部の電池に加わる圧力のばらつきを抑制することにある。 SUMMARY OF THE INVENTION An object of the present invention is to suppress variations in the pressure applied to the batteries inside the battery pack.

本発明によれば、
電池部と、
配線基板と、
前記電池部と前記配線基板との間に位置する基板ホルダと、
前記電池部、前記配線基板、および、前記基板ホルダを収容する筐体と、
を有しており、
前記電池部、前記配線基板、および、前記基板ホルダが重なる方向から見た場合に、前記配線基板は、前記電池部および前記基板ホルダよりも小さく、
前記基板ホルダは、前記配線基板と対向する面のうち、前記電池部と平面視で重なり、かつ、前記配線基板と平面視で重ならない領域に突状部材を備える、
電池パックが提供される。 According to the invention,
a battery section;
a wiring board;
a substrate holder positioned between the battery portion and the wiring substrate;
a housing that accommodates the battery unit, the wiring board, and the board holder;
and
When viewed from a direction in which the battery section, the wiring board, and the board holder overlap, the wiring board is smaller than the battery section and the board holder,
The substrate holder includes a protruding member in a region of a surface facing the wiring substrate, which overlaps with the battery portion in plan view and does not overlap with the wiring substrate in plan view.
A battery pack is provided.

本発明によれば、電池パック内部の電池に加わる圧力を均一化して不具合の発生を抑止することができる。 ADVANTAGE OF THE INVENTION According to this invention, the pressure applied to the battery inside a battery pack can be equalized, and generation|occurrence|production of a malfunction can be suppressed.

本発明に係る電池パックの全体的な構造を例示する図である。1 is a diagram illustrating the overall structure of a battery pack according to the present invention; FIG. 第１筐体部材側からの圧力の伝わり方を模式的に示す図である。It is a figure which shows typically how the pressure is transmitted from the 1st housing|casing member side. 突状部材の具体的な形状の一例を示す図である。It is a figure which shows an example of the specific shape of a projecting member. 突状部材の具体的な形状の他の例を示す図である。FIG. 10 is a diagram showing another example of a specific shape of the projecting member;

以下、本発明の実施形態について、図面を用いて説明する。尚、すべての図面において、同様な構成要素には同様の符号を付し、適宜説明を省略する。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in all the drawings, the same constituent elements are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

図１は、本発明に係る電池パック１０の全体的な構造を例示する図である。図１に示されるように、電池パック１０は、筐体１００、電池部１１０、配線基板１２０、および、基板ホルダ１３０を含んで構成される。なお、図中の矢印ｄは、電池パック１０を構成するこれらの部材の積層方向を示している。 FIG. 1 is a diagram illustrating the overall structure of a battery pack 10 according to the present invention. As shown in FIG. 1 , battery pack 10 includes housing 100 , battery section 110 , wiring board 120 , and board holder 130 . An arrow d in the drawing indicates the stacking direction of these members constituting the battery pack 10 .

筐体１００は、電池部１１０、配線基板１２０、および基板ホルダ１３０を収容する。図１の例では、筐体１００は、第１筐体部材１０２および第２筐体部材１０４を有している。第１筐体部材１０２および第２筐体部材１０４は、電池部１１０、配線基板１２０、および基板ホルダ１３０を積層方向ｄに沿って挟み込むことによって、これらを両側から加圧する構造を少なくとも有する。この構造により、電池部１１０、配線基板１２０、および基板ホルダ１３０は、外部からの振動や衝撃などによって動かないように固定される。 The housing 100 accommodates the battery section 110 , the wiring board 120 and the board holder 130 . In the example of FIG. 1, housing 100 has first housing member 102 and second housing member 104 . The first housing member 102 and the second housing member 104 have at least a structure that presses the battery section 110, the wiring board 120, and the board holder 130 from both sides by sandwiching them along the stacking direction d. With this structure, the battery section 110, the wiring board 120, and the board holder 130 are fixed so as not to move due to external vibration or shock.

電池部１１０は、直列または並列に接続された複数の電池セルを含む。電池部１１０で使用される電池セルは、例えば、ニッケルカドミウム電池、ニッケル水素電池、リチウムイオン電池などの二次電池である。 Battery unit 110 includes a plurality of battery cells connected in series or in parallel. The battery cells used in the battery unit 110 are, for example, secondary batteries such as nickel-cadmium batteries, nickel-hydrogen batteries, and lithium-ion batteries.

配線基板１２０は、充放電動作を行う電子回路を搭載している。配線基板１２０は、基板ホルダ１３０に収容された状態で、図示しない配線によって電池部１１０と接続される。配線基板１２０は、さらに、セルバランス動作の制御を行う回路を搭載していてもよい。 The wiring board 120 is mounted with an electronic circuit that performs charging and discharging operations. The wiring board 120 is connected to the battery section 110 by wiring (not shown) while being housed in the board holder 130 . The wiring board 120 may further mount a circuit for controlling the cell balance operation.

基板ホルダ１３０は、電池部１１０と配線基板１２０との間に位置する。基板ホルダ１３０の面のうち、電池部１１０および配線基板１２０と接している面は、絶縁性の部材で形成されており、電池部１１０とほぼ同じ形状及び大きさを有している。 The board holder 130 is positioned between the battery section 110 and the wiring board 120 . Of the surfaces of substrate holder 130 , the surface in contact with battery section 110 and wiring board 120 is made of an insulating member and has substantially the same shape and size as battery section 110 .

ここで、図１に例示される構造では、電池パック１０の部材の積層方向ｄにおいて、配線基板１２０のサイズが、電池部１１０および基板ホルダ１３０のサイズよりも小さくなっている。言い換えると、積層方向ｄにおいて、電池部１１０の一部は配線基板１２０から食み出している。このような構造においては、電池部１１０に圧力が不均一に加わる可能性が出てくる。これを、図２を用いて説明する。 Here, in the structure illustrated in FIG. 1 , the size of wiring board 120 is smaller than the size of battery section 110 and board holder 130 in the stacking direction d of the members of battery pack 10 . In other words, part of the battery section 110 protrudes from the wiring board 120 in the stacking direction d. In such a structure, there is a possibility that pressure will be unevenly applied to the battery section 110 . This will be explained using FIG.

図２は、第１筐体部材１０２側からの圧力の伝わり方を模式的に示す図である。図中実線の矢印で示すように、電池部１１０と基板ホルダ１３０とが平面視で重なり、かつ、配線基板１２０と基板ホルダ１３０とが平面視で重なる領域においては、第１筐体部材１０２側から加わる圧力が配線基板１２０および基板ホルダ１３０を介して電池部１１０に伝わる。一方、図中点線の矢印で示すように、電池部１１０と基板ホルダ１３０とが平面視で重なり、かつ、配線基板１２０と基板ホルダ１３０とが平面視で重ならない領域（斜線部で示す領域）においては、第１筐体部材１０２側から加わる圧力が電池部１１０に伝わらない。この力の伝達経路の偏りによって、電池部１１０に不均一な圧力が加わってしまう。 FIG. 2 is a diagram schematically showing how pressure is transmitted from the first housing member 102 side. As indicated by solid-line arrows in the drawing, in a region where the battery section 110 and the substrate holder 130 overlap in plan view and the wiring substrate 120 and the substrate holder 130 overlap in plan view, the first housing member 102 side The pressure applied from is transmitted to the battery section 110 via the wiring board 120 and the board holder 130 . On the other hand, as indicated by the dashed arrow in the figure, the area where the battery section 110 and the substrate holder 130 overlap in plan view and the wiring substrate 120 and the substrate holder 130 do not overlap in plan view (the shaded area). , the pressure applied from the first housing member 102 side is not transmitted to the battery section 110 . Uneven pressure is applied to the battery unit 110 due to the deviation of the force transmission path.

そこで、本発明に係る基板ホルダ１３０は、図中斜線部で示す領域に、筐体１００から加わる圧力を電池部１１０に伝えるための突状部材１３２を備える。この領域は、「配線基板１２０と対向する基板ホルダ１３０の面のうち、電池部１１０と平面視で重なり、かつ、配線基板１２０と平面視で重ならない領域」と呼ぶこともできる。なお、図１および図２において、突状部材１３２の具体的な形状は描かれていない。突状部材１３２は、電池部１１０、配線基板１２０および基板ホルダ１３０が筐体１００に収容された際に少なくとも一部が筐体１００の内壁に接触するように形成される。この構成により、第１筐体部材１０２側から加わる圧力が、突状部材１３２を介して電池部１１０に伝わるようになる。これにより、電池パック１０を製品として組み立てた際に、電池部１１０に加わる圧力を均一化することができる。結果として、電池部１１０に不均一に圧力が加わることによって、電池部１１０に不具合が生じることを抑制できる。 Therefore, the substrate holder 130 according to the present invention includes a projecting member 132 for transmitting the pressure applied from the housing 100 to the battery section 110 in the shaded area in the drawing. This region can also be called "a region of the surface of the substrate holder 130 facing the wiring board 120 that overlaps with the battery section 110 in plan view and does not overlap with the wiring board 120 in plan view". 1 and 2, the specific shape of the projecting member 132 is not drawn. Protrusive member 132 is formed such that at least a portion of projecting member 132 contacts the inner wall of housing 100 when battery unit 110 , wiring board 120 and substrate holder 130 are housed in housing 100 . With this configuration, the pressure applied from the side of the first housing member 102 is transmitted to the battery section 110 via the projecting member 132 . Thereby, when the battery pack 10 is assembled as a product, the pressure applied to the battery portion 110 can be made uniform. As a result, it is possible to prevent the battery unit 110 from malfunctioning due to non-uniform pressure applied to the battery unit 110 .

以下に、突状部材１３２の具体的な形状をいくつか例示する。 Some specific shapes of the projecting member 132 are exemplified below.

＜突状部材１３２の具体例１＞
図３は、突状部材１３２の具体的な形状の一例を示す図である。図３の例において、突状部材１３２は格子状のリブ部材１３２２である。格子の形状は例えば矩形であるが、他の多角形（例えば三角形や六角形）であってもよい。リブ部材１３２２の少なくとも一部が第１筐体部材１０２の内壁に接することにより、第１筐体部材１０２側から加わる圧力が格子状のリブ部材１３２２を介して電池部１１０に伝わるようになる。これにより、電池部１１０にかかる圧力を均一化することができる。なお、第１筐体部材１０２側から加わる圧力が電池部１１０の基板ホルダ１３０側の接触面に均一に伝わるようにするため、リブ部材１３２２の格子は、図３に示されるように、好ましくは等間隔に配置される。 <Specific example 1 of projecting member 132>
FIG. 3 is a diagram showing an example of a specific shape of the projecting member 132. As shown in FIG. In the example of FIG. 3, the projecting member 132 is a grid-shaped rib member 1322 . The shape of the grid is, for example, rectangular, but may be other polygonal (eg, triangular or hexagonal). At least a portion of rib member 1322 is in contact with the inner wall of first housing member 102 , so that pressure applied from the first housing member 102 side is transmitted to battery section 110 via grid-like rib member 1322 . Thereby, the pressure applied to the battery unit 110 can be made uniform. In order to uniformly transmit the pressure applied from the first housing member 102 side to the contact surface of the battery section 110 on the substrate holder 130 side, the lattice of the rib member 1322 is preferably arranged as shown in FIG. Evenly spaced.

＜突状部材１３２の具体例２＞
図４は、突状部材１３２の具体的な形状の他の例を示す図である。図４において、突状部材１３２は複数のボス部材１３２４である。複数のボス部材１３２４の少なくとも一部が第１筐体部材１０２の内壁に接することにより、第１筐体部材１０２側から加わる圧力が複数のボス部材１３２４をして電池部１１０に伝わるようになる。これにより、電池部１１０にかかる圧力を均一化することができる。なお、第１筐体部材１０２側から加わる圧力が電池部１１０の基板ホルダ１３０側の接触面に均一に伝わるようにするため、図４に示されるように、複数のボス部材１３２４は、好ましくは等間隔に配置される。図４の例では、複数のボス部材１３２４は等間隔の格子点上に配置されている。 <Specific example 2 of projecting member 132>
FIG. 4 is a diagram showing another example of a specific shape of the projecting member 132. As shown in FIG. In FIG. 4, projecting member 132 is a plurality of boss members 1324 . At least some of the plurality of boss members 1324 are in contact with the inner wall of the first housing member 102, so that pressure applied from the side of the first housing member 102 is transmitted to the battery section 110 through the plurality of boss members 1324. . Thereby, the pressure applied to the battery unit 110 can be made uniform. In order to uniformly transmit the pressure applied from the first housing member 102 side to the contact surface of the battery section 110 on the substrate holder 130 side, as shown in FIG. Evenly spaced. In the example of FIG. 4, the plurality of boss members 1324 are arranged on equally spaced lattice points.

また、図３および図４に示される例では、基板ホルダ１３０は、配線基板１２０と対向する基板ホルダ１３０の面から、突状部材１３２と同一方向に立設する壁部１３４を更に備える。そして、突状部材１３２および壁部１３４は、高さは互いにほぼ同じであり、かつ、共に、基板ホルダ１３０に収容される配線基板１２０の高さと同じ程度の高さを有する。これにより、電池部１１０、配線基板１２０、および基板ホルダ１３０を筐体１００に収容した際、配線基板１２０の少なくとも一部、突状部材１３２の少なくとも一部、および壁部１３４の少なくとも一部を、第１筐体部材１０２の内壁に接触させて、電池部１１０に圧力を伝える経路の偏りを小さくすることができる。これにより、第１筐体部材１０２側から電池部１１０に加わる圧力を均一化することが可能となる。 3 and 4, the substrate holder 130 further includes a wall portion 134 erected in the same direction as the projecting member 132 from the surface of the substrate holder 130 facing the wiring substrate 120. As shown in FIG. The protruding member 132 and the wall portion 134 have substantially the same height, and both have the same height as the wiring substrate 120 accommodated in the substrate holder 130 . As a result, when the battery section 110, the wiring board 120, and the board holder 130 are accommodated in the housing 100, at least a portion of the wiring board 120, at least a portion of the projecting member 132, and at least a portion of the wall portion 134 are , contact with the inner wall of the first housing member 102 to reduce deviation of the path for transmitting pressure to the battery section 110 . This makes it possible to equalize the pressure applied to the battery section 110 from the first housing member 102 side.

なお、突状部材１３２の形状は図３及び図４に示した例に限定されない。例えば、突状部材１３２は互いに平行に延在する壁状の突出部であってもよい。 Note that the shape of the projecting member 132 is not limited to the examples shown in FIGS. For example, the projecting members 132 may be wall-like projections extending parallel to each other.

以上、本発明では、配線基板１２０と対向する基板ホルダ１３０の面のうち、電池部１１０と平面視で重なり、かつ、配線基板１２０と平面視で重ならない領域に突状部材１３２が設けられている。この突状部材１３２により、第１筐体部材１０２から電池部１１０への力の伝達経路が形成され、基板ホルダ１３０を介して電池部１１０に伝わる圧力を均一化することが可能となる。 As described above, in the present invention, of the surface of the substrate holder 130 facing the wiring substrate 120, the projecting member 132 is provided in a region that overlaps with the battery section 110 in plan view and does not overlap with the wiring substrate 120 in plan view. there is The protruding member 132 forms a force transmission path from the first housing member 102 to the battery section 110 , making it possible to equalize the pressure transmitted to the battery section 110 via the substrate holder 130 .

以上、図面を参照して本発明の実施形態について述べたが、これらは本発明の例示であり、上記以外の様々な構成を採用することもできる。 Although the embodiments of the present invention have been described above with reference to the drawings, these are examples of the present invention, and various configurations other than those described above can also be adopted.

１０ 電池パック
１００ 筐体
１０２ 第１筐体部材
１０４ 第２筐体部材
１１０ 電池部
１２０ 配線基板
１３０ 基板ホルダ
１３２ 突状部材
１３２２ リブ部材
１３２４ ボス部材
１３４ 壁部 10 Battery pack 100 Housing 102 First housing member 104 Second housing member 110 Battery section 120 Wiring board 130 Board holder 132 Projecting member 1322 Rib member 1324 Boss member 134 Wall section

Claims (6)

電池部と、
配線基板と、
前記電池部と前記配線基板との間に位置する基板ホルダと、
前記電池部、前記配線基板、および、前記基板ホルダを収容する筐体と、
を有しており、
前記電池部、前記配線基板、および、前記基板ホルダが重なる方向から見た場合に、前記配線基板は、前記電池部および前記基板ホルダよりも小さく、
前記基板ホルダは、
前記配線基板と対向する面のうち、前記電池部と平面視で重なり、かつ、前記配線基板と平面視で重ならない領域に突状部材を備え、
他の内部部材と共に前記筐体に収容された場合に、筐体部材による挟持圧力を前記突状部材を介して前記電池部に伝達する第１の経路と、前記挟持圧力を前記配線基板を介して前記電池部に伝達する第２の経路と、を形成する、
電池パック。 a battery section;
a wiring board;
a substrate holder positioned between the battery portion and the wiring substrate;
a housing that accommodates the battery unit, the wiring board, and the board holder;
and
When viewed from a direction in which the battery section, the wiring board, and the board holder overlap, the wiring board is smaller than the battery section and the board holder,
The substrate holder is
A projecting member is provided in a region of a surface facing the wiring board that overlaps with the battery portion in plan view and does not overlap with the wiring board in plan view,
When housed in the housing together with other internal members, a first path for transmitting a clamping pressure from the housing member to the battery unit via the projecting member; forming a second path that transmits to the battery unit by
battery pack. 前記突状部材は格子状のリブ部材である、
請求項１に記載の電池パック。 The projecting member is a grid-shaped rib member,
The battery pack according to claim 1. 前記リブ部材の格子は等間隔に配置されている、
請求項２に記載の電池パック。 the lattice of the rib members is evenly spaced;
The battery pack according to claim 2. 前記突状部材は複数のボス部材である、
請求項１に記載の電池パック。 The projecting member is a plurality of boss members,
The battery pack according to claim 1. 前記複数のボス部材は等間隔に配置されている、
請求項４に記載の電池パック。 The plurality of boss members are arranged at regular intervals,
The battery pack according to claim 4. 前記基板ホルダは、前記面の端部から前記突状部材と同一方向に立設する壁部を更に備え、
前記壁部の高さは前記突状部材の高さと略同一である、
請求項１乃至５のいずれか一項に記載の電池パック。 The substrate holder further includes a wall portion erected from an end portion of the surface in the same direction as the protruding member,
The height of the wall portion is substantially the same as the height of the projecting member,
The battery pack according to any one of claims 1 to 5.
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JP2008166148A (en) 2006-12-28 2008-07-17 Sony Corp Battery pack
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JP2013118100A (en) 2011-12-02 2013-06-13 Sanyo Electric Co Ltd Battery pack and method of manufacturing the same
JP2014138483A (en) 2013-01-16 2014-07-28 Sanyo Electric Co Ltd Battery pack and electric apparatus

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JP2008166148A (en) 2006-12-28 2008-07-17 Sony Corp Battery pack
JP2012079536A (en) 2010-10-01 2012-04-19 Sanyo Electric Co Ltd Battery pack
US20120301747A1 (en) 2011-05-25 2012-11-29 Samsung Sdi Co., Ltd. Battery pack
JP2013118100A (en) 2011-12-02 2013-06-13 Sanyo Electric Co Ltd Battery pack and method of manufacturing the same
JP2014138483A (en) 2013-01-16 2014-07-28 Sanyo Electric Co Ltd Battery pack and electric apparatus

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