JP2016129144A - Power storage element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve vibration resistance and impact resistance of a power storage element.SOLUTION: A power storage element 100 comprises: a power generation element 101 provided with a separator, a negative electrode, and a positive electrode; a square housing 102 which houses the power generation element 101; a negative electrode terminal 131 and a positive electrode terminal 132 mounted on the housing 102; a negative electrode current collecting member 141 which connects the negative electrode terminal 131 and the negative electrode; and a positive electrode current collecting member 142 which connects the positive electrode terminal 132 and the positive electrode. The power storage element further includes a reinforcing member 107 which is disposed farther than a side end edge of an electrode terminal 103 of the power generation element 101 with respect to the electrode terminal 103 and has rigidity for physically connecting the negative electrode current collecting member 141 and the positive electrode current collecting member 142 in a crosslinked state.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a power storage element in which power storage / discharge means such as a power generation element and an electrolytic solution are housed in a casing, and more particularly to a power storage element in which the power generation element is held in a suspended state in a casing by a current collecting member.

  In recent years, a traveling vehicle that uses electric power as a driving source or a part of the driving source, such as a hybrid vehicle, an electric vehicle, and an assist bicycle, has attracted attention. Secondary battery) has been put to practical use. For example, a lithium ion battery or the like can be listed as the high energy capacity storage element.

  As an internal structure of such a power storage element, for example, as described in Patent Document 1, electrode terminals for supplying and storing power to a rigid housing made of metal or the like are attached in an insulated state. A current collecting member connected to the electrode terminal and arranged along the inner wall so as not to contact the inner wall of the housing, and a structure in which the power generating element is arranged in a bridged state between the two current collecting members It has been adopted.

  Further, as described in Patent Document 2, a technique has been proposed in which an insulating member is disposed between two current collecting members above a power generating element to protect the power generating element from a strong impact such as dropping. Yes.

JP 2008-2335099 A JP 2005-32477 A

  However, the power storage element has a structure in which a heavy power generation element is held in a housing. Therefore, the power storage element attached to the traveling vehicle or the like is relatively heavy due to vibrations when starting or stopping the traveling vehicle, vibrations during traveling, or shocks that occur in unexpected situations. A power generation element is shaken, the current collecting member is deformed or damaged, and there is a possibility that a short circuit or non-conduction occurs inside the housing. In addition, a force may be generated in the electrode terminal through the current collecting member, which may cause problems such as a broken seal on the housing.

  Further, by disposing the insulating member between the two current collecting members, there is a possibility that the power generating element can be protected from an impact such as when the battery is dropped. However, when vibration in a mode in which the distance between the two current collecting members becomes shorter or longer occurs for a long time, the insulation is disposed above the power generating element and has no physical connection with the current collecting member. It is considered difficult to protect the power generation element from the vibration with the member. Therefore, when the mode vibration is generated in the insulating member, the power generation element may be damaged, or the electrical connection between the power generation element and the current collecting member may be broken. In particular, the portion of the power generation element connected to the current collecting member is an uncoated metal foil that is a current collector on which no active material is formed in order to ensure electrical continuity. In some cases, the vibration of the end of the current collecting member, which is considered to be weaker and larger in amplitude than that of the current part, may cause local damage to the connecting part between the power generating element and the current collecting member, resulting in reduced battery performance. Conceivable.

  This invention is made | formed in view of the said subject, and aims at provision of an electrical storage element provided with high vibration resistance and impact resistance.

  In order to achieve the above object, a power storage device according to the present invention includes a power generation element including a separator, a negative electrode, and a positive electrode, a rectangular housing that houses the power generation element, and an electrode terminal attached to the housing. A negative electrode terminal; a positive electrode terminal; a negative electrode current collecting member that is a current collecting member that connects the negative electrode terminal and the negative electrode disposed at one end of the power generating element; A power storage element comprising a positive current collecting member that is a current collecting member connected to the positive electrode disposed at an end, and disposed farther from the electrode terminal side edge of the power generation element than the electrode terminal And a reinforcing member having rigidity for physically connecting the negative electrode current collecting member and the positive electrode current collecting member in a crosslinked state.

  This effectively protects the power generation element from vibrations in the mode in which the distance between the two current collecting members, particularly the distance between the ends connected to the electrode terminals, is shortened or lengthened. Therefore, it is possible to obtain a power storage element having high vibration resistance and shock resistance.

  In addition, the term “storage element” described in the specification and claims refers to an element that can electrochemically store electricity (or generate electricity) and discharge electricity as necessary. More specifically, it is described as including a storage battery, a capacitor, a large capacity capacitor, a capacitor, an electrolytic capacitor, an electric double layer capacitor, and the like.

  Further, the reinforcing member may be arranged in an inserted state inside the power generation element. Further, the power generation element may be a winding type, and may be formed by being wound around the reinforcing member that functions as a winding core.

  According to this, it is possible to arrange | position in the position which can exhibit a function effectively as a reinforcement member. Furthermore, the heat generated inside the power generation element can be conducted to the current collecting member, and it is possible to obtain a power storage element having high heat dissipation performance in addition to vibration resistance performance and impact resistance performance.

  In addition, the reinforcing member can be arranged in a wide range without enlarging the overall size of the power storage element, and the function as the reinforcing member can be effectively exhibited.

  The reinforcing member includes an end portion of the negative electrode current collecting member opposite to a portion connected to the negative electrode terminal, and an end portion of the positive electrode current collecting member opposite to the portion connected to the positive electrode terminal. May be physically connected.

  According to this, it becomes possible to connect the free ends of the current collecting member considered to have the largest amplitude, and to effectively protect the power generation element from the vibration of the current collecting member.

  The reinforcing member includes an insertion portion that is inserted through the current collecting member, the current collecting member includes a through hole that passes through the insertion portion, and the insertion portion is disposed near the current collecting hole. You may provide the engaging part engaged with a member. Moreover, the said reinforcement member may be provided with the fitting part which the edge part of the said current collection member fits in an insertion state.

  According to this, the reinforcing member and the current collecting member can be fixedly and easily connected, which can contribute to the improvement of the assembly efficiency of the power storage element.

  Further, the negative electrode current collecting member and the positive electrode current collecting member may be linearly supported by a reinforcing member from one wall surface of the housing to the other wall surface.

  According to this, the edge portion of the reinforcing member also functions as a buffering means, suppressing not only the vibration of the current collecting member but also the vibration of the power generating element swaying with respect to the housing, thereby improving the vibration resistance of the storage element. It becomes possible to improve.

  The housing includes a rectangular bottom, rectangular walls standing at respective end edges of the bottom, and a rectangular ceiling, and the power storage device further includes the current collecting member. A bottom buffering means disposed between the bottom part and having elasticity for regulating movement of the negative electrode current collector member and the positive electrode current collector member in a direction toward the bottom part; and the current collector member and the wall part At least one of wall cushioning means having elasticity that restricts movement of the negative electrode current collector member in the direction toward the wall portion and movement of the positive electrode current collector member in the direction toward the wall portion May be provided.

  Thereby, since the bottom buffering means and the wall buffering means flexibly regulate the relative movement of the current collecting member with respect to the housing, the relative movement of the power generation element connected to the current collecting member is also regulated. The In other words, the current collecting member, the power generation element, and the electrode terminal are protected from vibration and impact in the casing by the buffer means (hereinafter, the bottom buffer means and the wall buffer means may be collectively referred to as the buffer means). Therefore, it is possible to obtain a power storage element having high vibration resistance and shock resistance.

  In addition, the power generating element and the current collecting member can be protected against vibration and impact that compress the power generating element in the direction in which the current collecting members are arranged. Moreover, even if the urging force for urging the current collecting member in the direction of compressing the power generation element is generated by the elasticity of the wall buffer means, the reinforcing member can protect the power generation element against the urging force. Accordingly, since the wall cushioning means having a high urging force can be adopted for the power storage element, it is possible to improve the vibration resistance performance and impact resistance performance of the power storage element.

  The bottom buffering means may be arranged in contact with the two wall portions and the bottom portion facing in a direction intersecting with the direction in which the current collecting members are arranged.

  Moreover, the said wall buffer means may be arrange | positioned in the state which contacts three said wall parts.

  As a result, the current collecting member is not limited to the bottom buffering means and the wall buffering means, and the vibration generated in the direction intersecting the two directions as well as the direction in which the current collecting members are arranged and the direction connecting the bottom and the ceiling. It is possible to effectively protect the current collecting member, the power generation element, etc. even against an impact.

  Furthermore, it may be provided between the current collecting member and the ceiling part, and may include a spacer for maintaining the distance between the negative electrode current collecting member and the positive electrode current collecting member and the ceiling part.

  As a result, even if vibration or impact occurs in the direction connecting the ceiling and bottom, the distance between the current collector and the ceiling is maintained, so it is connected to the current collector and fixedly attached to the housing. The force generated at the electrode terminal can be reduced. Therefore, the sealing structure between the electrode terminal and the housing can be protected, and the vibration resistance performance and impact resistance performance of the power storage element can be improved.

  Further, the bottom buffering means and the wall buffering means may be fixedly joined to the negative electrode current collecting member and the positive electrode current collecting member, respectively.

  According to this, the current collecting member is generated not only in the direction in which the current collecting members are arranged by the bottom buffering means and the wall buffering means and in the direction connecting the bottom portion and the ceiling portion, but also in a direction intersecting the two directions. It is possible to protect the current collecting member, the power generation element and the like more strongly than the frictional force against vibration and impact. Further, the power storage element can be easily assembled, and the work efficiency of the storage element assembly can be improved.

  The bottom buffering means and the wall buffering means may be formed by bending the current collecting member.

  According to this, the number of parts constituting the power storage element can be reduced, and the overall efficiency of manufacturing the power storage element can be improved.

  According to the present invention, it is possible to improve the vibration resistance performance and impact resistance performance of the electricity storage device.

FIG. 1 is a perspective view schematically showing the external appearance of a power storage element. FIG. 2 is a perspective view schematically showing the inside of the electricity storage device with a part of the wall portion of the housing omitted. FIG. 3 is a perspective view showing the vicinity of one current collecting member, omitting the casing and the power generation element. FIG. 4 is a perspective view schematically showing the inside of the electricity storage device with a part of the wall portion and the power generation element omitted. FIG. 5 is a perspective view showing another embodiment of the buffer means. FIG. 6 is a plan view showing another embodiment of the buffer means in cross section. FIG. 7 is a plan view showing another embodiment of the buffer means in cross section. FIG. 8 is a perspective view showing a buffer means formed integrally with the current collecting member. FIG. 9 is a perspective view schematically showing the inside of the electricity storage device with a part of the wall portion of the housing and the power generation element omitted. FIG. 10 is a plan view showing, in cross section, a connection portion between the reinforcing member and the current collecting member. FIG. 11 is a plan view showing, in section, another aspect of the connection state between the reinforcing member and the current collecting member. FIG. 12 is a plan view showing another aspect of the connection state between the reinforcing member and the current collecting member in cross section. FIG. 13: is a top view which shows another aspect of the connection state of a reinforcement member and a current collection member in a cross section. FIG. 14 is a plan view showing another aspect of the connection state between the reinforcing member and the current collecting member in cross section. FIG. 15 is a perspective view schematically showing the inside of the electricity storage device with a part of the wall portion of the housing and the power generation element omitted. FIG. 16 is a perspective view showing a partial cross section of a connection portion between the reinforcing member and the current collecting member. FIG. 17 is a perspective view schematically showing the inside of the electricity storage device with a part of the wall portion of the housing omitted.

  Next, an embodiment of a power storage device according to the present invention will be described with reference to the drawings. In addition, the following embodiment is only what showed an example of the electrical storage element which concerns on this invention. Accordingly, the scope of the present invention is defined by the wording of the claims with reference to the following embodiments, and is not limited to the following embodiments.

(Embodiment 1)
FIG. 1 is a perspective view schematically showing the external appearance of a power storage element.

  FIG. 2 is a perspective view schematically showing the inside of the electricity storage device with a part of the wall portion of the housing omitted.

  As shown in these drawings, a power storage device 100 according to the present invention is a device capable of electrochemically storing (or generating) electricity and discharging electricity as necessary. In the case of the present embodiment, the storage element 100 is a nonaqueous electrolyte secondary battery (for example, a lithium ion battery), and includes a power generation element 101, a housing 102, a negative electrode terminal 131 that is an electrode terminal 103, and A positive electrode terminal 132, a negative current collecting member 141 that is the current collecting member 104, a positive current collecting member 142, a bottom buffering means 151 that is the buffering means 105, and a wall buffering means 152 are provided. In the case of the present embodiment, the power storage element 100 further includes a spacer 106. Note that a liquid such as an electrolytic solution is sealed in the housing 102 of the power storage element 100, but the liquid is not illustrated.

  In the present embodiment, the power generation element 101 is a member that can store electricity, including a separator, a negative electrode, and a positive electrode, although detailed illustration is omitted. The negative electrode is obtained by forming a negative electrode active material layer on the surface of a long strip-shaped negative electrode current collector sheet made of copper. In the positive electrode, a positive electrode active material layer is formed on the surface of a long belt-shaped positive electrode current collector sheet made of aluminum. The separator is a microporous sheet made of resin. In the case of the present embodiment, the power generation element 101 is wound in such a manner that the whole is formed in an oval shape in the length direction, so that the separator is sandwiched between the negative electrode and the positive electrode. Is formed. More specifically, the positive electrode and the negative electrode are wound in an oval shape around the rotation axis along the width direction while being shifted from each other in the width direction of the long band through the separator. And the positive electrode and the negative electrode are positive electrode current collectors in which no active material is formed at one end of the winding shaft, by making the edge portions in the respective shifting directions into non-active material forming portions. A certain aluminum foil is exposed, and a copper foil, which is a negative electrode current collector on which no active material is formed, is exposed at the other end of the winding shaft. In addition, current collecting members 104 are disposed at both ends of the power generation element 101 in the winding axis direction so as to extend in a direction perpendicular to the winding axis direction. Here, the positive electrode current collecting member 142 is connected to aluminum which is a positive electrode current collector exposed at one end of the winding shaft of the power generating element, and the negative electrode current collecting member 141 is also connected to the other end of the winding shaft of the power generating element. The exposed negative electrode current collector is connected to copper.

  The separator is not limited to one made of resin, but may be another member such as glass fiber. Further, in the figure, the power generation element 101 is schematically illustrated as a rectangular parallelepiped, but the longitudinal direction of the rectangular parallelepiped is along the axis around which a separator or the like is wound.

  Further, the power generation element 101 may be formed by folding a long strip-shaped member arranged in layers so that a separator is sandwiched between the negative electrode and the positive electrode.

  The casing 102 is a rectangular box-shaped member that accommodates the power generation element 101, and includes a rectangular bottom 121, rectangular walls 122 that stand on each end of the bottom 121, and a rectangular ceiling 123. And. In the case of the present embodiment, the casing 102 is configured by a casing main body having a rectangular cylindrical shape made of metal and having a bottom, and a lid that closes an opening of the casing main body, and the lid is a ceiling portion. 123. The housing can seal the inside of the housing 102 by housing the power generation element 101 and the like and then welding the lid and the housing body.

  The electrode terminal 103 is a terminal for introducing electricity stored in the power generation element 101 to the external space of the housing 102 and for introducing electricity into the internal space of the housing 102 in order to store electricity in the power generation element 101. It is attached over the external space from the internal space of the housing 102. In the present embodiment, the electrode terminal 103 is attached to the ceiling portion 123 of the housing 102. Further, since the housing 102 (ceiling portion 123) is made of metal, a packing (see FIG. 5) is provided for insulating the housing 102 and filling the gap with the housing 102 to seal the internal space of the housing 102. The housing 102 and the electrode terminal 103 are connected via a not-shown). The power storage device 100 includes a negative electrode terminal 131 and a positive electrode terminal 132 as the electrode terminals 103.

  The current collecting member 104 is electrically connected to the electrode terminal 103 and the power generation element 101 as well as mechanically connected thereto, and has electrical conductivity and rigidity disposed between the power generation element 101 and the wall portion 122. This is a so-called bus bar. In the case of the present embodiment, the current collecting member 104 is a metal plate-like member arranged in a bent state along the wall portion 122 and the ceiling portion 123 from the wall portion 122 to the ceiling portion 123, and the negative electrode terminal The negative electrode current collecting member 141 connects 131 and the negative electrode of the power generation element 101, and the positive current collector 142 connects the positive electrode terminal 132 and the positive electrode of the power generation element 101. The current collecting member 104 is fixedly connected to a portion of the electrode terminal 103 protruding inside the housing 102 with a rivet or the like, and is fixed to the negative electrode or the positive electrode of the electrode terminal 103 by welding or the like. It is connected to the. As a result, the power generation element 101 is held in a suspended state by the current collecting member 104 and the electrode terminal 103 inside the housing 102.

  In addition, the negative electrode current collection member 141 is formed with copper like the negative electrode, and the positive electrode current collection member 142 is formed with aluminum.

  Further, the method of joining the current collecting member 104 to the negative electrode or the positive electrode of the power generation element 101 is not particularly limited, but in the present embodiment, a part of the current collecting member 104 is bent with the welding fin 143. Thus, a method of joining by welding while sandwiching the negative electrode and the positive electrode of the power generation element 101 with the fins 143 is employed.

  FIG. 3 is a perspective view showing the vicinity of one current collecting member, omitting the casing and the power generation element. Note that a two-dot chain line in the drawing indicates the inner surface of the housing 102.

  The bottom buffering means 151 is disposed between the current collecting member 104 and the bottom 121 and flexibly restricts the movement of the negative electrode current collecting member 141 and the positive electrode current collecting member 142 in the direction toward the bottom 121. The wall buffering means 152 is disposed between the current collecting member 104 and the wall portion 122 and flexibly regulates the movement of the current collecting member 104 in the direction toward the wall portion 122 in the arrangement direction of the current collecting member 104. It is.

  In the present embodiment, the buffer means 105 is made of a metal having spring elasticity and is formed by bending a member. Thus, by forming the buffer means 105 with a metal, it is possible to sufficiently resist the electrolyte and to sufficiently resist the heat generated from the power generation element 101. The buffer means 105 is fixedly attached to the current collecting member 104 by welding or the like.

  Further, the bottom buffering means 151 is disposed in contact with the two wall portions 122 facing the direction (X-axis direction in the drawing) intersecting the direction in which the current collecting members 104 are arranged and the bottom portion 121. The wall cushioning means 152 is disposed in contact with the three wall portions 122.

  Accordingly, the buffer 105 can be prevented from moving in the direction (X-axis direction in the figure) intersecting the direction in which the current collecting members 104 are arranged inside the housing 102, and the current collector fixed to the buffer 105 is fixed. The movement of the electric member 104 in the X-axis direction can be flexibly restricted. Therefore, it is possible to flexibly restrict the movement of the power generation element 101 in the X-axis direction by the buffer means 105.

  Furthermore, since the buffering means 105 is not in direct contact with the power generation element 101, it is possible to suppress damage or short-circuiting of the power generation element 101 caused by rubbing between the buffering means 105 and the power generation element 101.

  In addition, when the electrode terminal 103, the current collecting member 104, and the power generation element 101 are attached to the ceiling portion 123 and inserted into the housing body, the buffering means 105 can be inserted at the same time. Since the buffering means 105 can be disposed at the position, it is possible to facilitate the assembly work of the power storage element 100.

  The spacer 106 is disposed between the current collecting member 104 and the ceiling portion 123, and is a member that maintains the gap between the negative electrode current collecting member 141 and the positive electrode current collecting member 142 and the ceiling portion 123.

  In the case of the present embodiment, the spacer 106 is a block-like member regulated by a resin that is stiffer than the packing disposed between the power generation element 101 and the housing 102 but has a certain degree of flexibility.

  By arranging the spacer 106 between the current collecting member 104 and the ceiling portion 123, even if vibration or impact occurs in the direction connecting the ceiling portion 123 and the bottom portion 121 (Z-axis direction in the figure), the current collecting member. 104 and the ceiling portion 123 are maintained, and the spacer 106 resists impact and the like. Therefore, the load applied to the packing disposed between the electrode terminal 103 and the housing 102 is reduced, and the packing such as packing is sealed. It is possible to protect the stop structure. In addition, since the current collecting member 104 can be pressed toward the ceiling 123 via the spacer 106 due to the elasticity of the bottom buffering means 151, the current collecting member 104 can be firmly held inside the housing 102.

  FIG. 4 is a perspective view schematically showing the inside of the electricity storage device with a part of the wall portion and the power generation element omitted.

  As shown in the figure, the power storage device 100 according to the present embodiment includes a reinforcing member 107.

  The reinforcing member 107 is a member that is disposed between the negative electrode current collecting member 141 and the positive electrode current collecting member 142 in a bridged state and has rigidity. In the case of the present embodiment, the reinforcing member 107 is insulative and is disposed in an inserted state inside the power generation element 101. More specifically, the winding corresponding to the winding shaft of the power generation element 101 is provided. Located in the center.

  The reinforcing member 107 can protect the power generating element and the current collecting member against vibration and impact that compress the power generating element 101 in the direction in which the current collecting members 104 are arranged (Y-axis direction in the drawing). Further, even if a biasing force that biases the current collecting member 104 in the Y-axis direction is generated due to the elasticity of the wall cushioning means 152, the reinforcing member 107 can protect the power generating element 101 against the biasing force. Therefore, the wall cushioning means 152 having a high urging force is used, and the reinforcing member 107 is held in a state of being strongly urged from both ends via the current collecting member 104 inside the housing 102, whereby strong vibrations and shocks are stored. Even when it occurs in the element 100, the current collecting member 104 and the power generation element 101 can be protected from deformation and damage.

  The reinforcing member 107 does not need to be a plate-like member, and may be a round bar or a tubular body. Furthermore, the electricity storage element 100 may include a plurality of reinforcing members 107, and the arrangement position is not only near the winding center, but also between the power generation element 101 and the ceiling portion 123 or between the power generation element 101 and the bottom portion 121. For example, it may be outside the power generation element 101.

  Further, the reinforcing member 107 may function as a winding core of the power generation element 101. That is, the power generation element 101 may be formed by being wound around the reinforcing member 107 with the reinforcing member 107 as a core.

  Further, the reinforcing member 107 physically connects the negative electrode current collecting member 141 and the positive electrode current collecting member 142 in a crosslinked state. In the case of the present embodiment, the reinforcing member 107 and the current collecting member 104 are connected by the urging force (elastic force) of the wall cushioning means 152. In addition, in order to assist the connection force, the reinforcing member 107 and the current collecting member 104 may be connected with an adhesive.

  With the above configuration, the negative electrode current collecting member 141 and the positive electrode current collecting member 142 are linearly supported by the buffer means 105 and the reinforcing member 107 from one wall surface of the housing 102 to the other wall surface. As a result, the vibration resistance and impact resistance of the electricity storage element 100 can be improved.

  As described in the above embodiment, in the power storage element 100, the current collecting member 104 inside the housing 102 is held by the buffering means 105, and the power generation element 101 is held by vibration or impact generated in the power storage element 100. The buffering means 105 can flexibly resist the force to be swung through the current collecting member 104. Therefore, the vibration resistance performance and impact resistance performance of the electricity storage device 100 can be improved.

  In addition, the heat generated by the reinforcing element 107 in the power generation element 101 can be effectively transmitted to the current collecting member 104, and further, the heat can be radiated to the outside via the buffer means 105 and the housing 102. Thus, it is possible to suppress the temperature rise of the storage element 100.

  In addition, this invention is not limited to the said embodiment. For example, another embodiment realized by arbitrarily combining the components described in this specification and excluding some of the components may be used as an embodiment of the present invention. In addition, the present invention includes modifications obtained by making various modifications conceivable by those skilled in the art without departing from the gist of the present invention, that is, the meaning described in the claims. It is.

  For example, when the buffering means 105 is made of metal, the buffering member 105 and the current collector 104 are not short-circuited by the buffering means 105 and between the buffering means 105 and the current collector 104 and the buffering means 105. An insulator needs to be disposed between at least one of the housing 102 and the housing 102. As the insulator, for example, a resin film may be disposed between the above, or may be disposed by insulating the surface of the buffer means 105. For example, when the buffer means 105 is formed of aluminum, anodizing can be listed as the insulating process. In this case, the insulating film disposed on the inner surface of the housing 102 can be eliminated, or the amount of use can be reduced.

  Even when the current collecting member 104 and the buffering means 105 are not fixedly connected, the movement of the current collecting member 104 in the X-axis direction is caused by the frictional force between the current collecting member 104 and the buffering means 105. It becomes possible to regulate flexibly.

  Furthermore, although the buffer means 105, in particular, the wall buffer means 152 is shown in a state where a plurality of the buffer means are arranged with respect to one current collecting member 104, the wall buffer means 152 may be singular. Further, the wall cushioning means 152 may have a length corresponding to the length of the current collecting member 104.

  Further, as shown in FIG. 5, the buffering means 105 may be disposed inside the housing 102 by line contact or the like instead of surface contact with the housing 102.

  As shown in FIGS. 6 and 7, the buffer 105 may be a slide member provided with an elastic body such as a spring.

  Further, as shown in FIG. 8, the current collecting member 104 and the buffering means 105 may be integrally formed by bending a single plate-like member having a conduction performance. In FIG. 8, the buffering means 105 symmetric with the buffering means 105 shown in the foreground in the drawing is also arranged on the back side of the current collecting member 104 (part of which is shown in FIG. 8). ). Thereby, it is possible to sufficiently achieve the operational effects of power storage element 100 in the above embodiment. In addition, the number of parts can be reduced, and since it is not necessary to join the current collecting member 104 and the buffering means 105 by welding or the like, the manufacturing process for manufacturing the power storage device 100 can be simplified.

  Further, the reinforcing member 107 may be disposed not only when the inside of the power generating element 101 is inserted, but also between the two current collecting members 104 outside the power generating element 101 in a bridging manner.

  Further, the spacer 106 may be omitted, and the buffering means 105 may be disposed at a position where the spacer 106 is disposed as an alternative to the spacer 106.

(Embodiment 2)
Next, other embodiment of the electrical storage element 100 which concerns on this invention is described. In addition, the same code | symbol is attached | subjected to the member etc. which have the same function as the said embodiment, and the description may be abbreviate | omitted.

  FIG. 9 is a perspective view schematically showing the inside of the electricity storage device with a part of the wall portion of the housing and the power generation element omitted.

  As shown in the figure, the energy storage device 100 according to the second embodiment is a secondary battery, and includes a power generation element 101, a housing 102, a negative electrode terminal 131 that is an electrode terminal 103, and a positive electrode terminal 132. A negative electrode current collecting member 141 that is the current collecting member 104, a positive electrode current collecting member 142, and a reinforcing member 107 are provided.

  The reinforcing member 107 is a member disposed farther from the electrode terminal 103 than the edge T (the portion surrounded by the broken line in FIG. 9) of the power generation element 101 on the electrode terminal 103 side, and the negative current collector 141 and the positive current collector. It is a member having rigidity to physically connect the electric member 142 in a crosslinked state.

  FIG. 10 is a plan view showing, in cross section, a connection portion between the reinforcing member and the current collecting member.

  As shown in the figure, in the case of the present embodiment, the reinforcing member 107 is disposed in the power generation element 101 in an inserted state, and the negative electrode current collecting member 141 on the opposite side to the portion connected to the negative electrode terminal 131. And the end of the positive electrode current collector 142 opposite to the portion connected to the positive terminal 132 are physically connected. In the case of the present embodiment, the reinforcing member 107 is also connected to the intermediate portion of the current collecting member 104.

  Specifically, the current collecting member 104 is provided with a through-hole 144 that penetrates in the thickness direction (Y-axis direction in FIG. 10), and the reinforcing member 107 is inserted through the through-hole 144. In addition, an engaging portion 172 that engages with the current collecting member 104 in the vicinity of the through hole 144 is provided at the tip of the insertion portion 171.

  With the above configuration, the negative electrode current collecting member 141 and the positive electrode current collecting member 142 are physically connected to each other in a bridging manner by the reinforcing member 107, and the reinforcing member 107 is subjected to vibration that shortens the distance between the two current collecting members 104. In addition to resisting, it is also possible to resist vibration in which the distance between the two current collecting members 104 is increased by the engaging portion 172 of the reinforcing member 107 in particular.

  The engaging portion 172 may be provided by plastically deforming the tip of the insertion portion 171 after the insertion portion 171 is inserted through the through hole 144. For example, when the reinforcing member 107 is formed of a thermoplastic resin, a high-temperature iron may be pressed against the tip of the insertion portion 171 to be plastically deformed. Further, the engaging portion 172 may be formed by bending the tip portion.

  Further, as shown in FIG. 11, the insertion portion 171 provided with the engagement portion 172 at the tip portion is forcibly inserted into the through hole 144, and the engagement portion 172 is restored by elasticity after passing through the through hole 144. The reinforcing member 107 and the current collecting member 104 may be physically connected.

  Further, as shown in FIG. 12, the reinforcing member 107 and the current collecting member 104 may be fastened by another member such as a bolt including an insertion portion 171 and an engaging portion 172.

  As shown in FIG. 13, a second through hole 175 that penetrates in the radial direction of the insertion portion 171 is provided near the tip of the insertion portion 171, and a pin-shaped fastener 176 is attached to the second through hole 175. The portion of the fastener 176 protruding in the radial direction from the insertion portion 171 may function as the engaging portion 172. Thereby, the reinforcing member 107 resists vibration that increases the distance between the two current collecting members 104.

  Further, as shown in FIG. 14, as a method of connecting the reinforcing member 107 and the end of the current collecting member 104 opposite to the portion connected to the electrode terminal 103, the fixing member 104 is fixedly penetrated. A U-shaped fitting portion 173 provided at the end of the reinforcing member 104 without providing a hole, and a U-shaped second notch 147 provided at the tip of the end of the current collecting member 104 They may be engaged with each other so that the end portions of the reinforcing member 107 receive the front end of the current collecting member 104 so as to be fitted to each other.

  Further, it is only necessary that a part of the reinforcing member 107 is arranged farther from the electrode terminal 103 than the edge T on the electrode terminal 103 side of the power generation element 101. That is, a part of the reinforcing member 107 may be disposed at a position closer to the electrode terminal 103 than the edge T on the electrode terminal 103 side of the power generation element 101.

(Embodiment 3)
Next, other embodiment of the electrical storage element 100 which concerns on this invention is described. In addition, the same code | symbol is attached | subjected to the member etc. which have the same function as the said embodiment, and the description may be abbreviate | omitted.

  FIG. 15 is a perspective view schematically showing the inside of the electricity storage device with a part of the wall portion of the housing and the power generation element omitted.

  As shown in the figure, the power storage device 100 according to the third embodiment includes a power generation element 101, a housing 102, a negative electrode terminal 131 that is an electrode terminal 103, a positive electrode terminal 132, and a current collecting member 104. A negative electrode current collecting member 141, a positive electrode current collecting member 142, and a reinforcing member 107 are provided.

  The reinforcing member 107 bridges the end portion of the negative electrode current collecting member 141 and the end portion of the positive electrode current collecting member 142 that are farthest from the end T on the electrode terminal 103 side of the power generation element 101 with respect to the electrode terminal 103. This is a member having physical connection rigidity.

  FIG. 16 is a perspective view showing a partial cross section of a connection portion between the reinforcing member and the current collecting member.

  As shown in the figure, in the case of the present embodiment, the reinforcing member 107 is provided with a fitting portion 173 into which the end portion of the current collecting member 104 is fitted in the inserted state, and the bottom portion 121 inside the housing 102. It is arranged in a state of touching. Further, the reinforcing member 107 has the same width as the width of the bottom 121 (length in the X-axis direction), and has the same length as the length of the bottom 121 (length in the Y-axis direction). That is, the reinforcing member 107 is disposed so as to spread over the entire bottom 121.

  The negative electrode current collecting member 141 and the positive electrode current collecting member 142 are in a suspended state until fitted into the fitting portion 173 of the reinforcing member 107 arranged in contact with the bottom portion 121.

  With the above configuration, the negative current collector 141 and the lowermost portion of the positive current collector 142 having the largest amplitude are connected in a bridged state by the reinforcing member 107, so the distance between the current collectors 104 changes. It is possible to effectively protect the power generation element 101 from such vibration.

  Furthermore, since the current collecting member 104 is arranged in a state of spreading over the entire bottom 121 of the housing 102, the lowermost portion of the negative current collecting member 141 and the positive current collecting member 142 is disposed through the reinforcing member 107. 102 is physically connected to 102. That is, the end edge portion of the reinforcing member 107 also functions as the buffer means 105.

  With the above configuration, the negative electrode current collecting member 141 and the positive electrode current collecting member 142 are supported by the reinforcing member 107 that also functions as the buffering means 105 linearly from one wall surface of the housing 102 to the other wall surface. As a result, the vibration resistance and impact resistance of the power storage element 100 can be improved.

  Further, the current collecting member 104 can be supported linearly from one wall surface to the other wall surface in the direction intersecting (orthogonal) with the extending direction of the reinforcing member 107 by the spacer 106 and the reinforcing member 107. Furthermore, the vibration resistance and impact resistance of the electricity storage element 100 can be improved.

  In the present invention, if there is a reinforcing member 107 or a portion thereof disposed farther from the electrode terminal 103 side edge T of the power generation element 101 than the electrode terminal 103, as shown in FIG. The second reinforcing member 179 arranged closer to the terminal 103 than the edge of the power generating element 101 on the electrode terminal 103 side is not denied.

  The present invention can be used for a power storage element, and can be suitably used particularly for a power storage element mounted on a traveling vehicle such as an automobile that is exposed to high vibration and impact.

DESCRIPTION OF SYMBOLS 100 Power storage element 101 Power generation element 102 Case 103 Electrode terminal 104 Current collecting member 105 Buffer means 106 Spacer 107 Reinforcement member 121 Bottom part 122 Wall part 123 Ceiling part 131 Negative electrode terminal 132 Positive electrode terminal 141 Negative electrode current collecting member 142 Positive electrode current collecting member 143 Fin 144 Through-hole 151 Bottom shock absorber 152 Wall shock absorber 171 Insertion part 172 Engagement part 173 Fitting part

  The present invention relates to a power storage element in which power storage / discharge means such as a power generation element and an electrolytic solution are housed in a casing, and more particularly to a power storage element in which the power generation element is held in a suspended state in a casing by a current collecting member.

  In recent years, a traveling vehicle that uses electric power as a driving source or a part of the driving source, such as a hybrid vehicle, an electric vehicle, and an assist bicycle, has attracted attention. Secondary battery) has been put to practical use. For example, a lithium ion battery or the like can be listed as the high energy capacity storage element.

  As an internal structure of such a power storage element, for example, as described in Patent Document 1, electrode terminals for supplying and storing power to a rigid housing made of metal or the like are attached in an insulated state. A current collecting member connected to the electrode terminal and arranged along the inner wall so as not to contact the inner wall of the housing, and a structure in which the power generating element is arranged in a bridged state between the two current collecting members It has been adopted.

  Further, as described in Patent Document 2, a technique has been proposed in which an insulating member is disposed between two current collecting members above a power generating element to protect the power generating element from a strong impact such as dropping. Yes.

JP 2008-2335099 A JP 2005-32477 A

  However, the power storage element has a structure in which a heavy power generation element is held in a housing. Therefore, the power storage element attached to the traveling vehicle or the like is relatively heavy due to vibrations when starting or stopping the traveling vehicle, vibrations during traveling, or shocks that occur in unexpected situations. A power generation element is shaken, the current collecting member is deformed or damaged, and there is a possibility that a short circuit or non-conduction occurs inside the housing. In addition, a force may be generated in the electrode terminal through the current collecting member, which may cause problems such as a broken seal on the housing.

  Further, by disposing the insulating member between the two current collecting members, there is a possibility that the power generating element can be protected from an impact such as when the battery is dropped. However, when vibration in a mode in which the distance between the two current collecting members becomes shorter or longer occurs for a long time, the insulation is disposed above the power generating element and has no physical connection with the current collecting member. It is considered difficult to protect the power generation element from the vibration with the member. Therefore, when the mode vibration is generated in the insulating member, the power generation element may be damaged, or the electrical connection between the power generation element and the current collecting member may be broken. In particular, the portion of the power generation element connected to the current collecting member is an uncoated metal foil that is a current collector on which no active material is formed in order to ensure electrical continuity. In some cases, the vibration of the end of the current collecting member, which is considered to be weaker and larger in amplitude than that of the current part, may cause local damage to the connecting part between the power generating element and the current collecting member, resulting in reduced battery performance. Conceivable.

  This invention is made | formed in view of the said subject, and aims at provision of an electrical storage element provided with high vibration resistance and impact resistance.

In order to achieve the above object, a power storage device according to the present invention is attached to a power generation element including a separator, a negative electrode, and a positive electrode, a rectangular housing that houses the power generation element, and a ceiling portion of the housing. A negative electrode terminal that is an electrode terminal, a positive electrode terminal, a negative electrode current collecting member that is a current collecting member that connects the negative electrode terminal and the negative electrode disposed at one end of the power generation element, the positive electrode terminal, and the power generation A positive electrode current collector member that is a current collector member connected to the positive electrode disposed at the other end of the element, the negative electrode current collector member or the positive electrode current collector member and the ceiling portion It is disposed between, characterized in that it comprises a spacer that maintain the distance between the negative current collector or the positive electrode current collector member and the ceiling portion.

As a result, even if vibration or impact occurs in the direction connecting the ceiling and bottom of the chassis, the distance between the current collector and the ceiling is maintained, so it is connected to the current collector and fixed to the chassis. The force generated in the electrode terminal that is attached can be reduced. Therefore, the sealing structure between the electrode terminal and the housing can be protected, and the vibration resistance performance and impact resistance performance of the power storage element can be improved.

  In addition, the term “storage element” described in the specification and claims refers to an element that can electrochemically store electricity (or generate electricity) and discharge electricity as necessary. More specifically, it is described as including a storage battery, a capacitor, a large capacity capacitor, a capacitor, an electrolytic capacitor, an electric double layer capacitor, and the like.

  According to the present invention, it is possible to improve the vibration resistance performance and impact resistance performance of the electricity storage device.

FIG. 1 is a perspective view schematically showing the external appearance of a power storage element. FIG. 2 is a perspective view schematically showing the inside of the electricity storage device with a part of the wall portion of the housing omitted. FIG. 3 is a perspective view showing the vicinity of one current collecting member, omitting the casing and the power generation element. FIG. 4 is a perspective view schematically showing the inside of the electricity storage device with a part of the wall portion and the power generation element omitted. FIG. 5 is a perspective view showing another embodiment of the buffer means. FIG. 6 is a plan view showing another embodiment of the buffer means in cross section. FIG. 7 is a plan view showing another embodiment of the buffer means in cross section. FIG. 8 is a perspective view showing a buffer means formed integrally with the current collecting member. FIG. 9 is a perspective view schematically showing the inside of the electricity storage device with a part of the wall portion of the housing and the power generation element omitted. FIG. 10 is a plan view showing, in cross section, a connection portion between the reinforcing member and the current collecting member. FIG. 11 is a plan view showing, in section, another aspect of the connection state between the reinforcing member and the current collecting member. FIG. 12 is a plan view showing another aspect of the connection state between the reinforcing member and the current collecting member in cross section. FIG. 13: is a top view which shows another aspect of the connection state of a reinforcement member and a current collection member in a cross section. FIG. 14 is a plan view showing another aspect of the connection state between the reinforcing member and the current collecting member in cross section. FIG. 15 is a perspective view schematically showing the inside of the electricity storage device with a part of the wall portion of the housing and the power generation element omitted. FIG. 16 is a perspective view showing a partial cross section of a connection portion between the reinforcing member and the current collecting member. FIG. 17 is a perspective view schematically showing the inside of the electricity storage device with a part of the wall portion of the housing omitted.

  Next, an embodiment of a power storage device according to the present invention will be described with reference to the drawings. In addition, the following embodiment is only what showed an example of the electrical storage element which concerns on this invention. Accordingly, the scope of the present invention is defined by the wording of the claims with reference to the following embodiments, and is not limited to the following embodiments.

(Embodiment 1)
FIG. 1 is a perspective view schematically showing the external appearance of a power storage element.

  FIG. 2 is a perspective view schematically showing the inside of the electricity storage device with a part of the wall portion of the housing omitted.

  As shown in these drawings, a power storage device 100 according to the present invention is a device capable of electrochemically storing (or generating) electricity and discharging electricity as necessary. In the case of the present embodiment, the storage element 100 is a nonaqueous electrolyte secondary battery (for example, a lithium ion battery), and includes a power generation element 101, a housing 102, a negative electrode terminal 131 that is an electrode terminal 103, and A positive electrode terminal 132, a negative current collecting member 141 that is the current collecting member 104, a positive current collecting member 142, a bottom buffering means 151 that is the buffering means 105, and a wall buffering means 152 are provided. In the case of the present embodiment, the power storage element 100 further includes a spacer 106. Note that a liquid such as an electrolytic solution is sealed in the housing 102 of the power storage element 100, but the liquid is not illustrated.

  In the present embodiment, the power generation element 101 is a member that can store electricity, including a separator, a negative electrode, and a positive electrode, although detailed illustration is omitted. The negative electrode is obtained by forming a negative electrode active material layer on the surface of a long strip-shaped negative electrode current collector sheet made of copper. In the positive electrode, a positive electrode active material layer is formed on the surface of a long belt-shaped positive electrode current collector sheet made of aluminum. The separator is a microporous sheet made of resin. In the case of the present embodiment, the power generation element 101 is wound in such a manner that the whole is formed in an oval shape in the length direction, so that the separator is sandwiched between the negative electrode and the positive electrode. Is formed. More specifically, the positive electrode and the negative electrode are wound in an oval shape around the rotation axis along the width direction while being shifted from each other in the width direction of the long band through the separator. And the positive electrode and the negative electrode are positive electrode current collectors in which no active material is formed at one end of the winding shaft, by making the edge portions in the respective shifting directions into non-active material forming portions. A certain aluminum foil is exposed, and a copper foil, which is a negative electrode current collector on which no active material is formed, is exposed at the other end of the winding shaft. In addition, current collecting members 104 are disposed at both ends of the power generation element 101 in the winding axis direction so as to extend in a direction perpendicular to the winding axis direction. Here, the positive electrode current collecting member 142 is connected to aluminum which is a positive electrode current collector exposed at one end of the winding shaft of the power generating element, and the negative electrode current collecting member 141 is also connected to the other end of the winding shaft of the power generating element. The exposed negative electrode current collector is connected to copper.

  The separator is not limited to one made of resin, but may be another member such as glass fiber. Further, in the figure, the power generation element 101 is schematically illustrated as a rectangular parallelepiped, but the longitudinal direction of the rectangular parallelepiped is along the axis around which a separator or the like is wound.

  Further, the power generation element 101 may be formed by folding a long strip-shaped member arranged in layers so that a separator is sandwiched between the negative electrode and the positive electrode.

  The casing 102 is a rectangular box-shaped member that accommodates the power generation element 101, and includes a rectangular bottom 121, rectangular walls 122 that stand on each end of the bottom 121, and a rectangular ceiling 123. And. In the case of the present embodiment, the casing 102 is configured by a casing main body having a rectangular cylindrical shape made of metal and having a bottom, and a lid that closes an opening of the casing main body, and the lid is a ceiling portion. 123. The housing can seal the inside of the housing 102 by housing the power generation element 101 and the like and then welding the lid and the housing body.

  The electrode terminal 103 is a terminal for introducing electricity stored in the power generation element 101 to the external space of the housing 102 and for introducing electricity into the internal space of the housing 102 in order to store electricity in the power generation element 101. It is attached over the external space from the internal space of the housing 102. In the present embodiment, the electrode terminal 103 is attached to the ceiling portion 123 of the housing 102. Further, since the housing 102 (ceiling portion 123) is made of metal, a packing (see FIG. 5) is provided for insulating the housing 102 and filling the gap with the housing 102 to seal the internal space of the housing 102. The housing 102 and the electrode terminal 103 are connected via a not-shown). The power storage device 100 includes a negative electrode terminal 131 and a positive electrode terminal 132 as the electrode terminals 103.

  The current collecting member 104 is electrically connected to the electrode terminal 103 and the power generation element 101 as well as mechanically connected thereto, and has electrical conductivity and rigidity disposed between the power generation element 101 and the wall portion 122. This is a so-called bus bar. In the case of the present embodiment, the current collecting member 104 is a metal plate-like member arranged in a bent state along the wall portion 122 and the ceiling portion 123 from the wall portion 122 to the ceiling portion 123, and the negative electrode terminal The negative electrode current collecting member 141 connects 131 and the negative electrode of the power generation element 101, and the positive current collector 142 connects the positive electrode terminal 132 and the positive electrode of the power generation element 101. The current collecting member 104 is fixedly connected to a portion of the electrode terminal 103 protruding inside the housing 102 with a rivet or the like, and is fixed to the negative electrode or the positive electrode of the electrode terminal 103 by welding or the like. It is connected to the. As a result, the power generation element 101 is held in a suspended state by the current collecting member 104 and the electrode terminal 103 inside the housing 102.

  In addition, the negative electrode current collection member 141 is formed with copper like the negative electrode, and the positive electrode current collection member 142 is formed with aluminum.

  Further, the method of joining the current collecting member 104 to the negative electrode or the positive electrode of the power generation element 101 is not particularly limited, but in the present embodiment, a part of the current collecting member 104 is bent with the welding fin 143. Thus, a method of joining by welding while sandwiching the negative electrode and the positive electrode of the power generation element 101 with the fins 143 is employed.

  FIG. 3 is a perspective view showing the vicinity of one current collecting member, omitting the casing and the power generation element. Note that a two-dot chain line in the drawing indicates the inner surface of the housing 102.

  The bottom buffering means 151 is disposed between the current collecting member 104 and the bottom 121 and flexibly restricts the movement of the negative electrode current collecting member 141 and the positive electrode current collecting member 142 in the direction toward the bottom 121. The wall buffering means 152 is disposed between the current collecting member 104 and the wall portion 122 and flexibly regulates the movement of the current collecting member 104 in the direction toward the wall portion 122 in the arrangement direction of the current collecting member 104. It is.

  In the present embodiment, the buffer means 105 is made of a metal having spring elasticity and is formed by bending a member. Thus, by forming the buffer means 105 with a metal, it is possible to sufficiently resist the electrolyte and to sufficiently resist the heat generated from the power generation element 101. The buffer means 105 is fixedly attached to the current collecting member 104 by welding or the like.

  Further, the bottom buffering means 151 is disposed in contact with the two wall portions 122 facing the direction (X-axis direction in the drawing) intersecting the direction in which the current collecting members 104 are arranged and the bottom portion 121. The wall cushioning means 152 is disposed in contact with the three wall portions 122.

  Accordingly, the buffer 105 can be prevented from moving in the direction (X-axis direction in the figure) intersecting the direction in which the current collecting members 104 are arranged inside the housing 102, and the current collector fixed to the buffer 105 is fixed. The movement of the electric member 104 in the X-axis direction can be flexibly restricted. Therefore, it is possible to flexibly restrict the movement of the power generation element 101 in the X-axis direction by the buffer means 105.

  Furthermore, since the buffering means 105 is not in direct contact with the power generation element 101, it is possible to suppress damage or short-circuiting of the power generation element 101 caused by rubbing between the buffering means 105 and the power generation element 101.

  In addition, when the electrode terminal 103, the current collecting member 104, and the power generation element 101 are attached to the ceiling portion 123 and inserted into the housing body, the buffering means 105 can be inserted at the same time. Since the buffering means 105 can be disposed at the position, it is possible to facilitate the assembly work of the power storage element 100.

  The spacer 106 is disposed between the current collecting member 104 and the ceiling portion 123, and is a member that maintains the gap between the negative electrode current collecting member 141 and the positive electrode current collecting member 142 and the ceiling portion 123.

  In the case of the present embodiment, the spacer 106 is a block-like member regulated by a resin that is stiffer than the packing disposed between the power generation element 101 and the housing 102 but has a certain degree of flexibility.

  By arranging the spacer 106 between the current collecting member 104 and the ceiling portion 123, even if vibration or impact occurs in the direction connecting the ceiling portion 123 and the bottom portion 121 (Z-axis direction in the figure), the current collecting member. 104 and the ceiling portion 123 are maintained, and the spacer 106 resists impact and the like. Therefore, the load applied to the packing disposed between the electrode terminal 103 and the housing 102 is reduced, and the packing such as packing is sealed. It is possible to protect the stop structure. In addition, since the current collecting member 104 can be pressed toward the ceiling 123 via the spacer 106 due to the elasticity of the bottom buffering means 151, the current collecting member 104 can be firmly held inside the housing 102.

  FIG. 4 is a perspective view schematically showing the inside of the electricity storage device with a part of the wall portion and the power generation element omitted.

  As shown in the figure, the power storage device 100 according to the present embodiment includes a reinforcing member 107.

  The reinforcing member 107 is a member that is disposed between the negative electrode current collecting member 141 and the positive electrode current collecting member 142 in a bridged state and has rigidity. In the case of the present embodiment, the reinforcing member 107 is insulative and is disposed in an inserted state inside the power generation element 101. More specifically, the winding corresponding to the winding shaft of the power generation element 101 is provided. Located in the center.

  The reinforcing member 107 can protect the power generating element and the current collecting member against vibration and impact that compress the power generating element 101 in the direction in which the current collecting members 104 are arranged (Y-axis direction in the drawing). Further, even if a biasing force that biases the current collecting member 104 in the Y-axis direction is generated due to the elasticity of the wall cushioning means 152, the reinforcing member 107 can protect the power generating element 101 against the biasing force. Therefore, the wall cushioning means 152 having a high urging force is used, and the reinforcing member 107 is held in a state of being strongly urged from both ends via the current collecting member 104 inside the housing 102, whereby strong vibrations and shocks are stored. Even when it occurs in the element 100, the current collecting member 104 and the power generation element 101 can be protected from deformation and damage.

  The reinforcing member 107 does not need to be a plate-like member, and may be a round bar or a tubular body. Furthermore, the electricity storage element 100 may include a plurality of reinforcing members 107, and the arrangement position is not only near the winding center, but also between the power generation element 101 and the ceiling portion 123 or between the power generation element 101 and the bottom portion 121. For example, it may be outside the power generation element 101.

  Further, the reinforcing member 107 may function as a winding core of the power generation element 101. That is, the power generation element 101 may be formed by being wound around the reinforcing member 107 with the reinforcing member 107 as a core.

  Further, the reinforcing member 107 physically connects the negative electrode current collecting member 141 and the positive electrode current collecting member 142 in a crosslinked state. In the case of the present embodiment, the reinforcing member 107 and the current collecting member 104 are connected by the urging force (elastic force) of the wall cushioning means 152. In addition, in order to assist the connection force, the reinforcing member 107 and the current collecting member 104 may be connected with an adhesive.

  With the above configuration, the negative electrode current collecting member 141 and the positive electrode current collecting member 142 are linearly supported by the buffer means 105 and the reinforcing member 107 from one wall surface of the housing 102 to the other wall surface. As a result, the vibration resistance and impact resistance of the electricity storage element 100 can be improved.

  As described in the above embodiment, in the power storage element 100, the current collecting member 104 inside the housing 102 is held by the buffering means 105, and the power generation element 101 is held by vibration or impact generated in the power storage element 100. The buffering means 105 can flexibly resist the force to be swung through the current collecting member 104. Therefore, the vibration resistance performance and impact resistance performance of the electricity storage device 100 can be improved.

  In addition, the heat generated by the reinforcing element 107 in the power generation element 101 can be effectively transmitted to the current collecting member 104, and further, the heat can be radiated to the outside via the buffer means 105 and the housing 102. Thus, it is possible to suppress the temperature rise of the storage element 100.

  In addition, this invention is not limited to the said embodiment. For example, another embodiment realized by arbitrarily combining the components described in this specification and excluding some of the components may be used as an embodiment of the present invention. In addition, the present invention includes modifications obtained by making various modifications conceivable by those skilled in the art without departing from the gist of the present invention, that is, the meaning described in the claims. It is.

  For example, when the buffering means 105 is made of metal, the buffering member 105 and the current collector 104 are not short-circuited by the buffering means 105 and between the buffering means 105 and the current collector 104 and the buffering means 105. An insulator needs to be disposed between at least one of the housing 102 and the housing 102. As the insulator, for example, a resin film may be disposed between the above, or may be disposed by insulating the surface of the buffer means 105. For example, when the buffer means 105 is formed of aluminum, anodizing can be listed as the insulating process. In this case, the insulating film disposed on the inner surface of the housing 102 can be eliminated, or the amount of use can be reduced.

  Even when the current collecting member 104 and the buffering means 105 are not fixedly connected, the movement of the current collecting member 104 in the X-axis direction is caused by the frictional force between the current collecting member 104 and the buffering means 105. It becomes possible to regulate flexibly.

  Furthermore, although the buffer means 105, in particular, the wall buffer means 152 is shown in a state where a plurality of the buffer means are arranged with respect to one current collecting member 104, the wall buffer means 152 may be singular. Further, the wall cushioning means 152 may have a length corresponding to the length of the current collecting member 104.

  Further, as shown in FIG. 5, the buffering means 105 may be disposed inside the housing 102 by line contact or the like instead of surface contact with the housing 102.

  As shown in FIGS. 6 and 7, the buffer 105 may be a slide member provided with an elastic body such as a spring.

  Further, as shown in FIG. 8, the current collecting member 104 and the buffering means 105 may be integrally formed by bending a single plate-like member having a conduction performance. In FIG. 8, the buffering means 105 symmetric with the buffering means 105 shown in the foreground in the drawing is also arranged on the back side of the current collecting member 104 (part of which is shown in FIG. 8). ). Thereby, it is possible to sufficiently achieve the operational effects of power storage element 100 in the above embodiment. In addition, the number of parts can be reduced, and since it is not necessary to join the current collecting member 104 and the buffering means 105 by welding or the like, the manufacturing process for manufacturing the power storage device 100 can be simplified.

  Further, the reinforcing member 107 may be disposed not only when the inside of the power generating element 101 is inserted, but also between the two current collecting members 104 outside the power generating element 101 in a bridging manner.

  Further, the spacer 106 may be omitted, and the buffering means 105 may be disposed at a position where the spacer 106 is disposed as an alternative to the spacer 106.

(Embodiment 2)
Next, other embodiment of the electrical storage element 100 which concerns on this invention is described. In addition, the same code | symbol is attached | subjected to the member etc. which have the same function as the said embodiment, and the description may be abbreviate | omitted.

  FIG. 9 is a perspective view schematically showing the inside of the electricity storage device with a part of the wall portion of the housing and the power generation element omitted.

  As shown in the figure, the energy storage device 100 according to the second embodiment is a secondary battery, and includes a power generation element 101, a housing 102, a negative electrode terminal 131 that is an electrode terminal 103, and a positive electrode terminal 132. A negative electrode current collecting member 141 that is the current collecting member 104, a positive electrode current collecting member 142, and a reinforcing member 107 are provided.

  The reinforcing member 107 is a member disposed farther from the electrode terminal 103 than the edge T (the portion surrounded by the broken line in FIG. 9) of the power generation element 101 on the electrode terminal 103 side, and the negative current collector 141 and the positive current collector. It is a member having rigidity to physically connect the electric member 142 in a crosslinked state.

  FIG. 10 is a plan view showing, in cross section, a connection portion between the reinforcing member and the current collecting member.

  As shown in the figure, in the case of the present embodiment, the reinforcing member 107 is disposed in the power generation element 101 in an inserted state, and the negative electrode current collecting member 141 on the opposite side to the portion connected to the negative electrode terminal 131. And the end of the positive electrode current collector 142 opposite to the portion connected to the positive terminal 132 are physically connected. In the case of the present embodiment, the reinforcing member 107 is also connected to the intermediate portion of the current collecting member 104.

  Specifically, the current collecting member 104 is provided with a through-hole 144 that penetrates in the thickness direction (Y-axis direction in FIG. 10), and the reinforcing member 107 is inserted through the through-hole 144. In addition, an engaging portion 172 that engages with the current collecting member 104 in the vicinity of the through hole 144 is provided at the tip of the insertion portion 171.

  With the above configuration, the negative electrode current collecting member 141 and the positive electrode current collecting member 142 are physically connected to each other in a bridging manner by the reinforcing member 107, and the reinforcing member 107 is subjected to vibration that shortens the distance between the two current collecting members 104. In addition to resisting, it is also possible to resist vibration in which the distance between the two current collecting members 104 is increased by the engaging portion 172 of the reinforcing member 107 in particular.

  The engaging portion 172 may be provided by plastically deforming the tip of the insertion portion 171 after the insertion portion 171 is inserted through the through hole 144. For example, when the reinforcing member 107 is formed of a thermoplastic resin, a high-temperature iron may be pressed against the tip of the insertion portion 171 to be plastically deformed. Further, the engaging portion 172 may be formed by bending the tip portion.

  Further, as shown in FIG. 11, the insertion portion 171 provided with the engagement portion 172 at the tip portion is forcibly inserted into the through hole 144, and the engagement portion 172 is restored by elasticity after passing through the through hole 144. The reinforcing member 107 and the current collecting member 104 may be physically connected.

  Further, as shown in FIG. 12, the reinforcing member 107 and the current collecting member 104 may be fastened by another member such as a bolt including an insertion portion 171 and an engaging portion 172.

  As shown in FIG. 13, a second through hole 175 that penetrates in the radial direction of the insertion portion 171 is provided near the tip of the insertion portion 171, and a pin-shaped fastener 176 is attached to the second through hole 175. The portion of the fastener 176 protruding in the radial direction from the insertion portion 171 may function as the engaging portion 172. Thereby, the reinforcing member 107 resists vibration that increases the distance between the two current collecting members 104.

  Further, as shown in FIG. 14, as a method of connecting the reinforcing member 107 and the end of the current collecting member 104 opposite to the portion connected to the electrode terminal 103, the fixing member 104 is fixedly penetrated. A U-shaped fitting portion 173 provided at the end of the reinforcing member 104 without providing a hole, and a U-shaped second notch 147 provided at the tip of the end of the current collecting member 104 They may be engaged with each other so that the end portions of the reinforcing member 107 receive the front end of the current collecting member 104 so as to be fitted to each other.

  Further, it is only necessary that a part of the reinforcing member 107 is arranged farther from the electrode terminal 103 than the edge T on the electrode terminal 103 side of the power generation element 101. That is, a part of the reinforcing member 107 may be disposed at a position closer to the electrode terminal 103 than the edge T on the electrode terminal 103 side of the power generation element 101.

(Embodiment 3)
Next, other embodiment of the electrical storage element 100 which concerns on this invention is described. In addition, the same code | symbol is attached | subjected to the member etc. which have the same function as the said embodiment, and the description may be abbreviate | omitted.

  FIG. 15 is a perspective view schematically showing the inside of the electricity storage device with a part of the wall portion of the housing and the power generation element omitted.

  As shown in the figure, the power storage device 100 according to the third embodiment includes a power generation element 101, a housing 102, a negative electrode terminal 131 that is an electrode terminal 103, a positive electrode terminal 132, and a current collecting member 104. A negative electrode current collecting member 141, a positive electrode current collecting member 142, and a reinforcing member 107 are provided.

  The reinforcing member 107 bridges the end portion of the negative electrode current collecting member 141 and the end portion of the positive electrode current collecting member 142 that are farthest from the end T on the electrode terminal 103 side of the power generation element 101 with respect to the electrode terminal 103. This is a member having physical connection rigidity.

  FIG. 16 is a perspective view showing a partial cross section of a connection portion between the reinforcing member and the current collecting member.

  As shown in the figure, in the case of the present embodiment, the reinforcing member 107 is provided with a fitting portion 173 into which the end portion of the current collecting member 104 is fitted in the inserted state, and the bottom portion 121 inside the housing 102. It is arranged in a state of touching. Further, the reinforcing member 107 has the same width as the width of the bottom 121 (length in the X-axis direction), and has the same length as the length of the bottom 121 (length in the Y-axis direction). That is, the reinforcing member 107 is disposed so as to spread over the entire bottom 121.

  The negative electrode current collecting member 141 and the positive electrode current collecting member 142 are in a suspended state until fitted into the fitting portion 173 of the reinforcing member 107 arranged in contact with the bottom portion 121.

  With the above configuration, the negative current collector 141 and the lowermost portion of the positive current collector 142 having the largest amplitude are connected in a bridged state by the reinforcing member 107, so the distance between the current collectors 104 changes. It is possible to effectively protect the power generation element 101 from such vibration.

  Furthermore, since the current collecting member 104 is arranged in a state of spreading over the entire bottom 121 of the housing 102, the lowermost portion of the negative current collecting member 141 and the positive current collecting member 142 is disposed through the reinforcing member 107. 102 is physically connected to 102. That is, the end edge portion of the reinforcing member 107 also functions as the buffer means 105.

  With the above configuration, the negative electrode current collecting member 141 and the positive electrode current collecting member 142 are supported by the reinforcing member 107 that also functions as the buffering means 105 linearly from one wall surface of the housing 102 to the other wall surface. As a result, the vibration resistance and impact resistance of the power storage element 100 can be improved.

  Further, the current collecting member 104 can be supported linearly from one wall surface to the other wall surface in the direction intersecting (orthogonal) with the extending direction of the reinforcing member 107 by the spacer 106 and the reinforcing member 107. Furthermore, the vibration resistance and impact resistance of the electricity storage element 100 can be improved.

  In the present invention, if there is a reinforcing member 107 or a portion thereof disposed farther from the electrode terminal 103 side edge T of the power generation element 101 than the electrode terminal 103, as shown in FIG. The second reinforcing member 179 arranged closer to the terminal 103 than the edge of the power generating element 101 on the electrode terminal 103 side is not denied.

  The present invention can be used for a power storage element, and can be suitably used particularly for a power storage element mounted on a traveling vehicle such as an automobile that is exposed to high vibration and impact.

DESCRIPTION OF SYMBOLS 100 Power storage element 101 Power generation element 102 Case 103 Electrode terminal 104 Current collecting member 105 Buffer means 106 Spacer 107 Reinforcement member 121 Bottom part 122 Wall part 123 Ceiling part 131 Negative electrode terminal 132 Positive electrode terminal 141 Negative electrode current collecting member 142 Positive electrode current collecting member 143 Fin 144 Through-hole 151 Bottom shock absorber 152 Wall shock absorber 171 Insertion part 172 Engagement part 173 Fitting part

Claims (7)

A power generation element including a separator, a negative electrode, and a positive electrode, a rectangular housing that houses the power generation element, a negative electrode terminal that is an electrode terminal attached to the housing, a positive electrode terminal, the negative electrode terminal, and the power generation A negative electrode current collecting member that is a current collecting member that connects the negative electrode disposed at one end of the element; and a current collecting member that connects the positive electrode terminal and the positive electrode disposed at the other end of the power generating element. A power storage device comprising a positive electrode current collecting member,
The housing includes a rectangular bottom, a rectangular wall portion standing on each end edge of the bottom portion, and a rectangular ceiling portion,
The electrode terminal is attached to the ceiling portion,
The storage element is
A reinforcing member that is disposed farther than the bottom edge of the power generation element with respect to the electrode terminal and has rigidity to physically connect the negative electrode current collecting member and the positive electrode current collecting member in a crosslinked state; ,
The reinforcing member includes a first end portion which is an end portion of the negative electrode current collecting member opposite to a portion connected to the negative electrode terminal, and the positive electrode current collector opposite to the portion connected to the positive electrode terminal. A power storage element that physically connects the first end and the second end by a portion disposed between a second end that is an end of the electric member. The reinforcing member includes an insertion portion that is inserted into the current collecting member,
The current collecting member includes a through hole that passes through the insertion portion,
The power storage element according to claim 1, wherein the insertion portion includes an engagement portion that engages with the current collecting member in the vicinity of the through hole. A power generation element including a separator, a negative electrode, and a positive electrode, a rectangular housing that houses the power generation element, a negative electrode terminal that is an electrode terminal attached to the housing, a positive electrode terminal, the negative electrode terminal, and the power generation A negative electrode current collecting member that is a current collecting member that connects the negative electrode disposed at one end of the element; and a current collecting member that connects the positive electrode terminal and the positive electrode disposed at the other end of the power generating element. A power storage device comprising a positive electrode current collecting member,
The housing includes a rectangular bottom, a rectangular wall portion standing on each end edge of the bottom portion, and a rectangular ceiling portion,
The electrode terminal is attached to the ceiling portion,
The storage element is
A reinforcing member that is disposed farther than the bottom edge of the power generation element with respect to the electrode terminal and has rigidity to physically connect the negative electrode current collecting member and the positive electrode current collecting member in a crosslinked state; ,
The said reinforcement member is an electrical storage element provided with the fitting part which the edge part of the said current collection member fits in an insertion state. The negative electrode current collecting member and the positive electrode current collecting member are supported by the reinforcing member linearly from one wall surface of the housing to the other wall surface, respectively. The electricity storage device described. The power storage element further includes
A bottom buffering means disposed between the current collecting member and the bottom, and having elasticity that restricts movement of the negative current collecting member and the positive current collecting member in a direction toward the bottom; and the current collecting An elastic wall disposed between a member and the wall portion, and having elasticity that restricts movement of the negative electrode current collector member toward the wall portion and movement of the positive electrode current collector member toward the wall portion The electrical storage element of any one of Claims 1-4 provided with at least one of a buffer means. further,
It is arrange | positioned between the said current collection member and the said ceiling part, The spacer which maintains the space | interval of the said negative electrode current collection member or the said positive electrode current collection member and the said ceiling part is provided. The electricity storage device according to item. The power storage element according to claim 1, wherein the reinforcing member is disposed in contact with the two wall portions facing the arrangement direction of the current collecting members and the bottom portion.

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