JP2006155934A - Battery structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve mounting property of a battery by improving volume efficiency. <P>SOLUTION: The battery 100 comprises an electrode body comprising a positive electrode plate, a negative electrode plate and a separator provided between the positive electrode plate and the negative electrode plate, a cap-like positive electrode terminal 106 provided at one end of the electrode body and connected with the positive electrode plate, a cap-like negative electrode terminal 104 provided at the other end of the electrode body and connected with the negative electrode plate, and an exterior part 102 sealing the electrode body so that a part of the positive electrode terminal 106 and a part of the negative electrode terminal 104. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a structure of a battery, and more particularly to a structure of an exterior part that seals an electrode body.

  Conventionally, secondary batteries used for hybrid vehicles and the like include lead batteries, nickel metal hydride (Ni-MH) batteries, lithium ion batteries, and the like. A secondary battery can be discharged again by supplying a charging current from the outside when power is consumed, and thus has been conventionally applied to various devices.

  For example, a secondary battery is mounted on a vehicle and serves as an engine starting battery that supplies power to an ignition plug, a starter, and the like of the engine at the time of starting. Recently, in electric vehicles (EV) and hybrid vehicles (HV), it is also used as a main power source when driving a traveling motor.

  Since such a secondary battery is mounted on a vehicle, it is desirable that it be lighter. Therefore, for example, Japanese Patent Application Laid-Open No. 2003-346798 (Patent Document 1) discloses a secondary battery having a configuration housed in a laminate outer package. This secondary battery includes a positive electrode, a negative electrode, and an electrolyte sandwiched therebetween. The secondary battery has a laminate outer package.

According to the secondary battery disclosed in Patent Document 1, it is possible to easily configure the secondary battery and the assembled battery using the secondary battery and the free shape by using the configuration housed in the laminate outer package. it can.
JP 2003-346798 A

  However, a battery with a better mountability is required as a battery mounted on a vehicle. This is because, for example, in a vehicle, the mounting space is limited by a passenger compartment, an engine, a battery cooling device, and the like. In the secondary battery disclosed in Patent Document 1, the electrode body is sandwiched between exterior bodies using a laminate film, and four sides are welded. Therefore, there is a problem that the volume efficiency is deteriorated because the welded portions on the four sides protrude from the battery body.

  Further, if the protruding amount when the battery terminal is pulled out from the exterior body is large, there is a problem that the volume efficiency is deteriorated by the protruding terminal.

  Volume efficiency is the ratio of the volume of the battery to the volume of the rectangular parallelepiped formed by the maximum values of the length, width and height of the battery. Therefore, when the volumetric efficiency is deteriorated, it is necessary to secure a larger battery mounting space, and there is a problem that the battery mounting property is deteriorated.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a battery structure that improves volume efficiency and improves battery mountability.

  The structure of the battery according to the first invention is provided at one end of an electrode body formed by a positive electrode plate, a negative electrode plate, and a separator provided between the positive electrode plate and the negative electrode plate. A cap-shaped positive electrode terminal connected to the positive electrode plate, a cap-shaped negative electrode terminal provided at the other end of the electrode body and connected to the negative electrode plate, a part of the positive electrode terminal and a part of the negative electrode terminal exposed In this way, an exterior portion that seals the electrode body is included.

  According to the first invention, the electrode body is provided between the cap-shaped positive terminal and the cap-shaped negative terminal. An exterior part (for example, an exterior part formed using a laminate film) seals the electrode body such that a part of the cap-shaped positive terminal and a part of the cap-shaped negative terminal are exposed. The laminated film forming the exterior part is welded to the cap-shaped positive electrode terminal and the negative electrode terminal so that a part of the positive electrode terminal and a part of the negative electrode terminal are exposed. Since the exterior portion is formed along the shape of the electrode body, the exterior portion can be formed without the welded portion protruding in the outer peripheral direction of the battery. Therefore, it is possible to suppress an increase in the maximum value of each dimension of length, width, and height, so that volume efficiency can be improved. Moreover, since the cap-shaped positive electrode terminal and the negative electrode terminal itself are part of the exterior part that seals the electrode body, it is not necessary to draw out the terminal from the inside of the battery. Therefore, compared with the case where a terminal is pulled out from the inside of a battery, the protrusion amount can be reduced. As a result, the volumetric efficiency of the battery can be improved. Therefore, it is possible to provide a battery structure that improves the volume efficiency and improves the battery mountability. Moreover, since the cross-sectional area of the terminal can be increased, the internal resistance can be reduced. Therefore, the performance of the battery can be improved.

  In the structure of the battery according to the second invention, in addition to the configuration of the first invention, a part of the positive electrode terminal exposed is formed on one side of the battery, and a part of the negative electrode terminal exposed is the other It is formed on the side surface.

  According to the second invention, the exposed part of the positive electrode terminal is formed on one side surface of the battery, and the exposed part of the negative electrode terminal is formed on the other side surface. For example, when forming a battery pack by stacking a plurality of batteries, either one of the positive electrode terminal and the negative electrode terminal is provided on one side surface and the other side surface at positions facing each other along the stacking direction. By forming so that one part may be exposed, an assembled battery can be formed, without the external shape of an assembled battery becoming large by the connection terminal which connects batteries. Therefore, the battery pack can be reduced in size.

  In the structure of the battery according to the third invention, in addition to the configuration of the second invention, the one side surface and the other side surface are side surfaces at positions facing each other.

  According to the third invention, for example, when forming a battery pack by stacking a plurality of batteries, the positive electrode terminal and the one side face and the other side face at positions facing each other along the stacking direction By forming a part of either one of the negative electrode terminals to be exposed, the assembled battery can be formed without increasing the outer shape of the assembled battery by the connection terminal for connecting the batteries. Therefore, the battery pack can be reduced in size.

  In the structure of the battery according to the fourth invention, in addition to the configuration of any one of the first to third inventions, the exterior part is formed using a laminate film. The electrode body is hermetically sealed by adhering a laminate film to the positive electrode terminal and the negative electrode terminal.

  According to 4th invention, an exterior part is formed using a laminate film. The electrode body is hermetically sealed by adhering a laminate film to the positive electrode terminal and the negative electrode terminal. Since an exterior part using a laminate film is formed between the cap-shaped positive electrode terminal and the negative electrode terminal along the shape of the electrode body, the exterior part is formed without the adhesive part protruding in the outer peripheral direction of the battery. Can do. Therefore, it is possible to suppress an increase in the maximum value of each dimension of length, width, and height, so that volume efficiency can be improved.

  In the structure of the battery according to the fifth invention, in addition to the structure of any one of the first to fourth inventions, the electrode body is formed by winding a laminate composed of a positive electrode plate, a negative electrode plate, and a separator. .

  According to the fifth invention, volume efficiency can be improved even when the present invention is applied to a battery having an electrode body formed by winding a laminate composed of a positive electrode plate, a negative electrode plate, and a separator.

  In the structure of the battery according to the sixth invention, in addition to the structure of any one of the first to fourth inventions, the electrode body is formed by laminating a plurality of laminates composed of a positive electrode plate, a negative electrode plate, and a separator. Is done.

  According to the sixth invention, volume efficiency can be improved even when the present invention is applied to a battery having an electrode body formed by laminating a plurality of laminated bodies composed of a positive electrode plate, a negative electrode plate, and a separator. .

  In the structure of the battery according to the seventh invention, in addition to the structure of any one of the first to sixth inventions, the battery is a secondary battery.

  According to the seventh invention, by applying the present invention to a secondary battery such as a nickel cadmium battery, a nickel metal hydride battery, a lead storage battery and a lithium ion battery, the volume efficiency of the secondary battery mounted on the vehicle is improved. Can do.

  Hereinafter, the structure of the battery according to the embodiment of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  As shown in FIG. 1, the battery 100 according to the embodiment of the present invention includes a positive terminal 106, a negative terminal 104, and an exterior part 102. Each of the positive electrode terminal 106 and the negative electrode terminal 104 has a rectangular parallelepiped cap shape. The exterior part 102 is formed using a laminate film. The exterior part 102 seals an internal electrode body (not shown). Further, the inside of the exterior portion 102 of the battery 100 is filled with an electrolytic solution.

  In battery 100 according to the present embodiment, a laminate film forming exterior portion 102 is wound around the electrode body. The ends of the laminate film are welded together to form the welded portion 110. In the present embodiment, the laminate film has, for example, a rectangular shape, but is not particularly limited. Then, the laminate film is welded to the positive electrode terminal 106, and the weld portion 112 is formed along the side surface of the cap-shaped positive electrode terminal 106. Similarly, the laminate film is welded to the negative electrode terminal 104, and the weld portion 108 is formed along the side surface of the cap-shaped negative electrode terminal 104.

  In addition, the exterior part 102 is not limited to sealing an internal electrode body by welding the edge parts of a laminate film, and a laminate film, the positive electrode terminal 106, and the negative electrode terminal 104. FIG. For example, the exterior 102 may be configured such that the ends of the laminate film and the laminate film and the positive electrode terminal 106 and the negative electrode terminal 104 are bonded using an adhesive to seal the internal electrode body.

  In the present embodiment, electrode body 114 is formed of a positive electrode plate, a negative electrode plate, and a separator provided between the positive electrode plate and the negative electrode plate. As shown in FIG. 2, the electrode body 114 is formed by winding a laminate composed of a positive electrode plate, a negative electrode plate, and a separator.

  In the present embodiment, the electrode body 114 is described as being formed by winding a laminated body including a positive electrode plate, a negative electrode plate, and a separator. However, the structure of the electrode body 114 is particularly limited to this. Is not to be done. For example, the electrode body 114 may be formed by laminating a plurality of laminated bodies composed of a positive electrode plate, a negative electrode plate, and a separator.

  In the present embodiment, battery 100 is not particularly limited as long as it is a battery including a positive electrode terminal, an electrode body, and a negative electrode terminal. Therefore, the battery may be a secondary battery such as a nickel cadmium battery, a nickel hydride battery, a lead storage battery, and a lithium ion battery, or may be a primary battery such as a manganese battery or an alkaline battery.

  The cap-shaped positive electrode terminal 106 is connected to a positive electrode plate extended from one end of the electrode body 114. On the other hand, the cap-shaped negative electrode terminal 104 is connected to a negative electrode plate extended from the other end of the electrode body 104. The cap-shaped positive electrode terminal 106 and the negative electrode terminal 104 have a rectangular parallelepiped cap shape in the present embodiment, but are not particularly limited as long as they have a cap shape. That is, the cap-shaped positive electrode terminal 106 and the negative electrode terminal 104 may be formed in a shape corresponding to the battery mounting structure.

  As shown in FIG. 3, the portion extending from the negative electrode plate of the laminate 200 to the negative electrode terminal 104 side and the cap-shaped negative electrode terminal 104 are connected to the negative electrode terminal 104 after the extended negative electrode plate is assembled to the cap-shaped negative electrode terminal 104. The plate and the negative electrode terminal 104 are welded and connected. An opening 208 for inserting a welding tool is formed in the cap-shaped negative electrode terminal 104.

  As shown in FIG. 4, the laminate 200 is formed by laminating a negative electrode plate 202, a separator 204, and a positive electrode plate 206. When the extended portion of the negative electrode plate 202 is assembled to the negative electrode terminal 104, a welding tool is inserted into the opening 208, and the negative electrode plate 202 and the cap-shaped negative electrode terminal 104 are sandwiched between the welded portion 210, It welds in 212,214. The positive electrode plate 206 and the cap-shaped positive electrode terminal 106 are similarly connected by welding. Therefore, the details are not repeated. Note that the connection between the terminal and the electrode plate is not particularly limited to the above-described welding.

  The operation of the battery structure according to the present embodiment based on the above structure will be described.

  A portion extending from the positive electrode plate 206 and a portion extending from the negative electrode plate 202 are provided at both ends of the electrode body 114 formed by winding the laminated body 200. The cap-shaped positive electrode terminal 106 is assembled to the positive electrode plate 206, and the cap-shaped negative electrode terminal 104 is assembled to the negative electrode plate 202. Then, the positive electrode plate 206 and the positive electrode terminal 106 are welded, and the negative electrode plate 202 and the negative electrode terminal 104 are welded. In this way, the exterior portion 102 formed using the laminate film is wound in a state where the positive electrode terminal 106 and the negative electrode terminal 104 are connected to both ends of the electrode body 114. The ends of the wound laminate film are welded together to form a welded portion 110. The laminate film is welded so that a part of the cap-shaped positive terminal 106 and a part of the negative terminal 104 are exposed, and the electrode body 114 is sealed together with the electrolytic solution. In the battery 100 manufactured in this way, since the exterior portion 102 is formed between the positive electrode terminal 106 and the negative electrode terminal 104 along the shape of the electrode body 114, the welded portions 108, 110, and 112 are connected to the battery 100. It does not protrude in the outer peripheral direction.

  At this time, a part of the exposed positive electrode terminal 106 and the negative electrode terminal 104 may be provided anywhere on the positive electrode terminal 106 and the negative electrode terminal 104, but preferably, a part of the exposed positive electrode terminal 106 is one of the batteries 100. It is desirable that a part of the negative electrode terminal 104 formed on the side surface and exposed is formed on the other side surface of the battery 100. For example, in the case of forming an assembled battery by stacking a plurality of batteries 100, a part of the positive electrode terminal 106 exposed on each of one side surface and the other side surface at positions facing each other along the stacking direction and By providing the exposed part of the negative electrode terminal 104, the assembled battery is formed without increasing the outer shape of the assembled battery by the connection terminal for connecting the batteries 100 to each other.

  As described above, according to the structure of the battery according to the present embodiment, the electrode body is provided between the cap-shaped positive terminal and the cap-shaped negative terminal. The exterior part formed using the laminate film is welded so that a part of the cap-shaped positive terminal and a part of the cap-shaped negative terminal are exposed, thereby sealing the electrode body. Thereby, since the exterior part is formed between the cap-shaped positive electrode terminal and the negative electrode terminal along the shape of the electrode body, the welded portion can be prevented from protruding in the outer peripheral direction of the battery. Therefore, it is possible to suppress an increase in the maximum value of each dimension of length, width, and height, so that volume efficiency can be improved. Moreover, since the cap-shaped positive electrode terminal and the negative electrode terminal itself are part of the exterior part that seals the electrode body, it is not necessary to draw out the terminal from the inside of the battery. Therefore, compared with the case where a terminal is pulled out from the inside of a battery, the protrusion amount can be reduced. As a result, the volumetric efficiency of the battery can be improved. Therefore, it is possible to provide a battery structure that improves the volume efficiency and improves the battery mountability.

  In addition, the exposed part of the positive electrode terminal is formed on one side surface of the battery, and the exposed part of the negative electrode terminal is formed on the other side surface. When forming a battery pack by stacking a plurality of batteries, a part of the positive electrode terminal and the negative electrode terminal is exposed on one side surface and the other side surface at positions facing each other along the stacking direction. By forming the battery pack, the battery pack can be formed without increasing the outer shape of the battery pack by connecting terminals for connecting the batteries. Therefore, the battery pack can be reduced in size.

  Furthermore, since the cross-sectional areas of the positive electrode terminal and the negative electrode terminal can be increased, the internal resistance can be reduced. Therefore, the performance of the battery can be improved.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows the external appearance of the battery which concerns on this Embodiment. It is a figure which shows the structure of the battery which concerns on this Embodiment. In the battery which concerns on this Embodiment, it is a figure which shows the connection structure of a terminal and an electrode plate. It is a figure which shows 4-4 cross section of FIG.

Explanation of symbols

  100 battery, 102 exterior part, 104 negative electrode terminal, 106 positive electrode terminal, 108, 110, 112 welded part, 114 electrode body, 200 laminate, 202 negative electrode plate, 204 separator, 206 positive electrode plate, 208 opening, 210, 212, 214 welds.

Claims (7)

An electrode body formed by a positive electrode plate, a negative electrode plate, and a separator provided between the positive electrode plate and the negative electrode plate;
A cap-shaped positive electrode terminal provided at one end of the electrode body and connected to the positive electrode plate;
A cap-shaped negative electrode terminal provided at the other end of the electrode body and connected to the negative electrode plate;
A battery structure including an exterior portion that seals the electrode body such that a part of the positive electrode terminal and a part of the negative electrode terminal are exposed.   The battery structure according to claim 1, wherein the exposed part of the positive electrode terminal is formed on one side surface of the battery and the exposed part of the negative electrode terminal is formed on the other side surface.   The battery structure according to claim 2, wherein the one side surface and the other side surface are side surfaces at positions facing each other. The exterior part is formed using a laminate film,
The battery structure according to claim 1, wherein the electrode body is hermetically sealed by adhering the laminate film to the positive electrode terminal and the negative electrode terminal.   The battery structure according to claim 1, wherein the electrode body is formed by winding a laminate including the positive electrode plate, the negative electrode plate, and the separator.   5. The battery structure according to claim 1, wherein the electrode body is formed by laminating a plurality of laminated bodies including the positive electrode plate, the negative electrode plate, and the separator.   The battery structure according to claim 1, wherein the battery is a secondary battery.

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