JP2018032560A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device capable of uniformizing temperature distribution.SOLUTION: A power storage device 10 comprises a plurality of first power storage units each of which includes one or more power storage elements 300, and a plurality of second power storage units each of which includes one or more power storage elements 300 and has a heat output different from the first power storage units. The power storage device further comprises a first connection member 410 connected to the terminals of two first power storage units without being connected to a terminal of the second power storage unit arranged between the two first power storage units, and a second connection member 420 connected to terminals of two second power storage units without being connected to a terminal of the first power storage unit arranged between the two second power storage units.SELECTED DRAWING: Figure 3A

Description

  The present invention relates to a power storage device including a plurality of power storage elements.

  Conventionally, a power storage device including a plurality of power storage elements is widely known (see, for example, Patent Document 1).

JP 2012-227176 A

  Here, there is a problem that a temperature distribution may occur in the power storage device when the conventional power storage devices are arranged adjacent to each other. For example, when a power storage device including a plurality of power storage elements and a power storage device including a plurality of power storage elements having different calorific values are arranged adjacent to each other, heat is transmitted between the power storage devices, A temperature distribution occurs in the power storage device. When the temperature distribution occurs in the power storage device, the performance of the power storage elements is varied.

  The present invention has been made to solve the above-described problem, and an object thereof is to provide a power storage device that can achieve uniform temperature distribution.

  In order to achieve the above object, a power storage device according to one embodiment of the present invention includes a plurality of first power storage units including one or more power storage elements, and includes one or more power storage elements and the first power storage unit. A power storage device including a plurality of second power storage units having different calorific values, wherein the two first power storage units are not connected to a terminal of the second power storage unit disposed between the two first power storage units. A first connecting member connected to a terminal of the unit, and a terminal of the two second power storage units without being connected to a terminal of the first power storage unit disposed between the two second power storage units; A second connecting member to be connected.

  According to this, the power storage device includes the first power storage unit and the second power storage unit having different calorific values, and the first connection member that connects the terminals of the two first power storage units is the second power storage unit. The second connection member that connects the terminals of the two second power storage units is not connected to the terminal of the first power storage unit. Here, when the first power storage unit and the second power storage unit are connected in series with the same connecting member, the current value is the same, and when connected in parallel, the voltage value is the same, but is connected to a different connecting member. Therefore, there is no limitation on the current value and voltage value, and the difference in the amount of heat generation tends to increase. In other words, the power storage device includes two power storage devices that tend to have a large difference in calorific value between a power storage device having a plurality of first power storage units and a power storage device having a plurality of second power storage units. It has become. In such a configuration, the second power storage unit is disposed between the two first power storage units, and the first power storage unit is disposed between the two second power storage units. As a result, the first power storage unit and the second power storage unit having different heat generation amounts are arranged in a distributed manner, whereby the temperature distribution in the power storage device can be made uniform.

  Further, a connection surface of the terminals of the two first power storage units with the first connection member is a first connection surface, and a connection surface of the terminals of the two second power storage units with the second connection member is a second. The second connection surface, which is a connection surface and is disposed between the two first connection surfaces, may be disposed at a position different from the line segment connecting the two first connection surfaces. .

  According to this, the 2nd connection surface which is a connection surface with the 2nd connection member of the terminal of the 2nd electrical storage unit is two 2nd connection surfaces with the 1st connection member of the terminal of two 1st electrical storage units. It is not placed on a line segment connecting one connection surface. For this reason, when connecting two 1st connection surfaces with a 1st connection member, it can suppress that a 2nd connection surface becomes obstructive.

  Further, at least one first connection surface of the two first connection surfaces is disposed at a position higher than the second connection surface disposed between the two first connection surfaces, The connection member may extend from one first connection surface of the two first connection surfaces toward the other first connection surface and be connected to the two first connection surfaces.

  According to this, at least 1 1st connection surface is arrange | positioned in a position higher than a 2nd connection surface, and a 1st connection member is extended toward the other 1st connection surface from one 1st connection surface. Are connected to the two first connection surfaces. Thereby, a 1st connection member can be made into the simple structure which connects two 1st connection surfaces linearly.

  The second connection member extends from one second connection surface of the two second connection surfaces in a direction different from a direction toward the other second connection surface, and the two second connection surfaces It may be connected to the surface.

  According to this, the second connection member extends in a direction different from the direction from the one second connection surface toward the other second connection surface, and is connected to the two second connection surfaces. The two connection members can bypass the terminals of the first power storage unit and can be easily connected to the two second connection surfaces.

  Further, the second connection member extends from the two second connection surfaces to the outside of the second power storage unit as viewed from a direction intersecting the second connection surface, and the two second connection surfaces It may be connected.

  Here, when a gas discharge valve, a substrate, or the like is disposed between the positive electrode terminal and the negative electrode terminal of the second power storage unit, it is necessary to ensure a gas discharge path, an arrangement space for the substrate, and the like. For this reason, the second connection member is configured to extend from the two second connection surfaces to the outside of the second power storage unit and be connected to the two second connection surfaces. Arrangement space etc. can be secured easily.

  Further, the second connection surface arranged between the two first connection surfaces is different from a line segment connecting the two first connection surfaces when viewed from a direction intersecting the second connection surface. The first connection member is disposed at a position, and extends from one first connection surface of the two first connection surfaces toward the other first connection surface and is connected to the two first connection surfaces. You may decide.

  According to this, the first connection member is not disposed on the line segment connecting the two first connection surfaces when the second connection surface is viewed from the direction intersecting the second connection surface. The two first connection surfaces are connected so as to extend from one connection surface to the other first connection surface. Thereby, a 1st connection member can be made into the simple structure which connects two 1st connection surfaces linearly.

  Further, the first connection surface disposed between the two second connection surfaces is different from a line segment connecting the two second connection surfaces when viewed from a direction intersecting the first connection surface. The second connection member is disposed at a position, and extends from one second connection surface of the two second connection surfaces toward the other second connection surface and is connected to the two second connection surfaces. You may decide.

  According to this, the second connection member is not disposed on the line segment connecting the two second connection surfaces when the first connection surface is viewed from the direction intersecting the first connection surface, It connects with two 2nd connection surfaces so that it may extend toward the other 2nd connection surface from a 2nd connection surface. Thereby, a 2nd connection member can be set as the simple structure which connects two 2nd connection surfaces linearly.

  Further, a connection surface of the terminals of the two first power storage units with the first connection member is a first connection surface, and a connection surface of the terminals of the two second power storage units with the second connection member is a second. As the connection surface, the two first connection surfaces and the two second connection surfaces are arranged at the same height, and the first connection member and the second connection member are the two first connection members. Extending from the surface and the two second connection surfaces to the opposite side to the straight line connecting the first connection surface and the second connection surface, the two first connection surfaces and the two second connection surfaces It may be connected to.

  According to this, the first connection surface and the second connection surface are arranged at the same height, the first connection member and the second connection member extend from the first connection surface and the second connection surface to the opposite side, It is connected with two first connection surfaces and two second connection surfaces. For this reason, even when the first connection surface and the second connection surface are arranged at the same height, the first connection member and the second connection member connect the terminal of the second power storage unit and the terminal of the first power storage unit. By detouring, the first connection member and the second connection member can be easily connected to the two first connection surfaces and the two second connection surfaces.

  Further, a connection surface of the terminals of the two first power storage units with the first connection member is a first connection surface, and a connection surface of the terminals of the two second power storage units with the second connection member is a second. The two first connection surfaces and the two second connection surfaces are arranged at the same height, and the first connection member is connected to the second connection surface from the two first connection surfaces. You may decide to extend to a position higher than a connection surface and to connect with the two first connection surfaces across the second connection surface.

  According to this, even when the first connection surface and the second connection surface are arranged at the same height, the first connection member straddles the second connection surface at a position higher than the second connection surface. The first connection member can be easily connected to the two first connection surfaces.

  As described above, in the power storage device, the temperature distribution in the power storage device can be easily uniformed by easily configuring the first connection member and the second connection member. Note that the present invention can be realized not only as such a power storage device, but also as a connection member (first connection member, second connection member) included in the power storage device.

  According to the power storage device of the present invention, the temperature distribution can be made uniform.

It is a perspective view which shows the external appearance of the electrical storage apparatus which concerns on embodiment. It is a disassembled perspective view which shows each component at the time of decomposing | disassembling the electrical storage apparatus which concerns on embodiment. It is a top view which shows the connection form of the electrode terminal of the electrical storage element which concerns on embodiment, and a bus bar, and the structure of a bus bar. It is a side view which shows the connection form of the electrode terminal of the electrical storage element which concerns on embodiment, and the structure of a bus bar, and a bus bar. It is a top view which shows the connection form of the electrode terminal of the electrical storage element which concerns on the modification 1 of embodiment, and the bus bar, and the structure of a bus bar. It is a side view which shows the connection form of the electrode terminal of an electrical storage element which concerns on the modification 1 of embodiment, and the bus bar, and the structure of a bus bar. It is a top view which shows the connection form of the electrode terminal of the electrical storage element which concerns on the modification 2 of embodiment, and the bus bar, and the structure of a bus bar. It is a side view which shows the connection form of the electrode terminal of an electrical storage element which concerns on the modification 2 of embodiment, and a bus bar, and the structure of a bus bar. It is a top view which shows the connection form of the electrode terminal of the electrical storage element which concerns on the modification 3 of embodiment, and the bus bar, and the structure of a bus bar. It is a side view which shows the connection form of the electrode terminal of the electrical storage element which concerns on the modification 3 of embodiment, and the bus bar, and the structure of a bus bar. It is a top view which shows the connection form of the electrode terminal of the electrical storage element which concerns on the modification 4 of embodiment, and a bus bar, and the structure of a bus bar. It is a side view which shows the connection form of the electrode terminal of an electrical storage element which concerns on the modification 4 of embodiment, and a bus bar, and the structure of a bus bar. It is a top view which shows typically the structure of the electrical storage apparatus which concerns on the modification 5 of embodiment.

  Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements. In each drawing, dimensions and the like are not strictly illustrated.

  In the following description and drawings, the direction in which the storage elements are arranged, the direction in which the long side surfaces of the containers of the storage elements are opposed, or the thickness direction of the containers is defined as the X-axis direction. In addition, the direction in which the electrode terminals are arranged in one power storage element or the facing direction of the short side surface of the container of the power storage element is defined as the Y-axis direction. Further, the vertical direction of the electricity storage element (the direction in which gravity acts in a state where the container lid is installed facing upward) is defined as the Z-axis direction. These X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect (orthogonal in this embodiment). Although the case where the Z-axis direction does not become the vertical direction may be considered depending on the usage mode, the Z-axis direction will be described below as the vertical direction for convenience of explanation. In the following description, for example, the X axis direction plus side indicates the arrow direction side of the X axis, and the X axis direction minus side indicates the opposite side to the X axis direction plus side. The same applies to the Y-axis direction and the Z-axis direction.

(Embodiment)
First, the configuration of the power storage device 10 will be described.

  FIG. 1 is a perspective view showing an appearance of power storage device 10 according to the present embodiment. FIG. 2 is an exploded perspective view showing each component when the power storage device 10 according to the present embodiment is disassembled. In these drawings, the lid of the exterior body 100 is omitted for convenience of explanation.

  The power storage device 10 is a device that can charge electricity from the outside and discharge electricity to the outside. For example, the power storage device 10 is a battery module used for an automobile power source such as an electric vehicle (EV), a hybrid electric vehicle (HEV), or a plug-in hybrid electric vehicle (PHEV), or a power storage power source.

  As illustrated in FIGS. 1 and 2, the power storage device 10 includes an exterior body 100, an electrical storage element 300 accommodated inside the exterior body 100, a bus bar 400, and the like. The power storage device 10 also includes an external terminal (not shown) that connects an external conductive member and the electrode terminal of the power storage element 300, details of which will be described later. In addition to these configurations, the power storage device 10 may also include a bus bar frame that positions the bus bar 400 with respect to the electrode terminals of the power storage element 300, and electrical devices such as a circuit board and a relay.

  The exterior body 100 is a rectangular (box-shaped) container (module case) that constitutes the exterior body of the power storage device 10. That is, the exterior body 100 is disposed outside the power storage element 300, the bus bar 400, and the like, and protects the power storage element 300 and the like from impact and the like. The package 100 is made of an insulating resin material such as polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polybutylene terephthalate (PBT), or ABS resin. Yes. Thus, the outer package 100 avoids the storage element 300 or the like from coming into contact with an external metal member or the like. The exterior body 100 also has a flat rectangular lid (not shown), but the description of the lid is omitted.

  The power storage element 300 is a secondary battery (unit cell) that can charge and discharge electricity, and more specifically, a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery. . The power storage element 300 has a flat rectangular shape, and in this embodiment, eight power storage elements 300 are arranged in the X-axis direction and accommodated in the exterior body 100. In addition, the electrical storage element 300 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it. Further, the number of power storage elements 300 accommodated in the exterior body 100 is not limited.

  Here, the power storage device 300 includes a container 310, a positive electrode terminal 320, and a negative electrode terminal 330. In addition, an electrode body (power generation element), a positive electrode current collector, a negative electrode current collector, and the like are disposed inside the container 310, and an electrolyte solution (nonaqueous electrolyte) and the like are also enclosed. The illustration is omitted, and detailed description is also omitted.

  The container 310 is a rectangular parallelepiped (square) case having a lid portion on the upper side (plus Z-axis direction). Although the material of the container 310 is not specifically limited, For example, it is preferable that it is a metal which can be welded, such as stainless steel, aluminum, and aluminum alloy. In addition, a gas discharge valve 340 that discharges gas inside the container 310 when the internal pressure of the container 310 rises is formed in the lid portion of the container 310. In addition, a liquid injection port for injecting an electrolyte into the container 310 and a liquid injection stopper for closing the liquid injection port are also arranged in the lid, but detailed description thereof will be omitted.

  The positive electrode terminal 320 is an electrode terminal on the positive electrode side of the electric storage element 300, and the negative electrode terminal 330 is an electrode terminal on the negative electrode side of the electric storage element 300, both of which are attached to the lid portion of the container 310. That is, the positive electrode terminal 320 and the negative electrode terminal 330 lead the electricity stored in the electrode body to the external space of the storage element 300, and introduce electricity into the internal space of the storage element 300 in order to store electricity in the electrode body. This is a metal electrode terminal. In the present embodiment, power storage element 300 is arranged with positive electrode terminal 320 and negative electrode terminal 330 facing upward.

  The bus bar 400 is a conductive plate-like member such as a metal that is disposed above the electrode terminals of the plurality of power storage elements 300 and electrically connects the electrode terminals. Specifically, bus bar 400 connects positive electrode terminal 320 or negative electrode terminal 330 of one power storage element 300 to negative electrode terminal 330 or positive electrode terminal 320 of another power storage element 300.

  In the present embodiment, bus bar 400 is connected to the electrode terminal of power storage element 300 by welding joining such as laser welding, resistance welding or ultrasonic welding, but is connected by mechanical joining such as bolting or caulking. Also good. The bus bar 400 is made of, for example, aluminum as a conductive member, but the material of the bus bar 400 is not particularly limited. Further, the bus bar 400 may be formed of a member made of the same material, or one of the bus bars may be formed of a member made of a different material.

  Next, the connection form between the electrode terminal of the power storage element 300 and the bus bar 400 and the configuration of the bus bar 400 will be described in more detail.

  FIG. 3A is a plan view showing a connection form between the electrode terminals of power storage element 300 and bus bar 400 according to the present embodiment and the configuration of bus bar 400. FIG. 3B is a side view showing a connection form between the electrode terminal of power storage element 300 and bus bar 400 according to the present embodiment and the configuration of bus bar 400. That is, FIG. 3A is a view of the configuration in which the bus bar 400 is connected to the electrode terminal of the power storage element 300 as viewed from the positive side in the Z-axis direction, and FIG. It is the figure which looked at the structure which looked at from the Y-axis direction minus side.

  Here, as shown in these drawings, eight power storage elements 300 are sequentially set as power storage elements 301 to 308 from the minus side in the X-axis direction, and the positive electrode terminal 320 and the negative electrode terminal 330 of the power storage elements 301 to 308 are connected to the positive electrode terminals. 321 to 328 and negative electrode terminals 331 to 338. In addition, the bus bar 400 that connects the power storage elements 301, 303, 305, and 307 is referred to as a first connection member 410, and the bus bar 400 that connects the power storage elements 302, 304, 306, and 308 is referred to as a second connection member 420. That is, the power storage elements 301, 303, 305, and 307 and the power storage elements 302, 304, 306, and 308 are not electrically connected via the bus bar 400, and are power storage element groups having different systems.

  Therefore, in the following description, for convenience of explanation, each of the power storage elements 301, 303, 305, and 307 is referred to as a first power storage unit, and each of the power storage elements 302, 304, 306, and 308 is referred to as a second power storage unit. Sometimes called. Note that the power storage unit is used as a general term for devices having one or more power storage elements, and in this embodiment, each power storage unit has one power storage element.

  In addition, the power storage elements 301, 303, 305, and 307 (first power storage unit) are different in heat generation from the power storage elements 302, 304, 306, and 308 (second power storage unit). That is, each of the first power storage units has the same amount of heat generation, and each of the second power storage units has the same amount of heat generation. Is different. As described above, the power storage device 10 includes a plurality of first power storage units each including one power storage element, and includes a plurality of second power storage units including one power storage element and having a calorific value different from that of the first power storage unit. .

  Note that the amount of heat generated is different when the type of storage element (internal structure, size, shape, etc.) is different, or even if the type is the same, the amount of heat generated depends on the usage status (usage time, usage rate cycle, usage environment, etc.). This includes cases where they are different. Further, the heat generation amount of the first power storage unit may be larger or smaller than the heat generation amount of the second power storage unit.

  Here, in the present embodiment, the first power storage unit is connected by three first connection members 410, and the second power storage unit is connected by three second connection members 420. The configurations of the first connection member 410 and the second connection member 420 will be described in more detail below.

  The first connection member 410 is a bus bar that is connected to the terminals of the two first power storage units without being connected to the terminals of the second power storage unit disposed between the two first power storage units. Specifically, the first connection member 410 arranged on the minus side in the X-axis direction is not connected to the electrode terminal of the power storage element 302 between the power storage elements 301 and 303, and the electrodes of the power storage elements 301 and 303 are connected. Connected to the terminal. More specifically, the first connection member 410 is connected to the positive terminal 321 of the power storage element 301 and the negative terminal 333 of the power storage element 303. The same applies to the other first connection members 410. The first connection member 410 sequentially connects the electrode terminals of the power storage elements 301, 303, 305, and 307 in series.

  In addition, the second connection member 420 is a bus bar that is connected to the terminals of the two second power storage units without being connected to the terminals of the first power storage unit disposed between the two second power storage units. It is. Specifically, the second connection member 420 disposed on the minus side in the X-axis direction is not connected to the electrode terminal of the power storage element 303 between the power storage elements 302 and 304, and the electrodes of the power storage elements 302 and 304 are connected. Connected to the terminal. More specifically, the second connection member 420 is connected to the positive terminal 322 of the power storage element 302 and the negative terminal 334 of the power storage element 304. The same applies to the other second connection members 420. The second connection member 420 sequentially connects the electrode terminals of the power storage elements 302, 304, 306, and 308 in series.

  In the first power storage unit, the negative electrode terminal 331 of the power storage element 301 is connected to an external terminal (not shown) on the negative electrode side of the first power storage unit via a conductive member or the like. Further, the positive electrode terminal 327 of the power storage element 307 is connected to an external terminal (not shown) on the positive electrode side of the first power storage unit via a conductive member or the like. In the second power storage unit, the negative electrode terminal 332 of the power storage element 302 is connected to an external terminal (not shown) on the negative electrode side of the second power storage unit via a conductive member or the like. The positive electrode terminal 328 of the power storage element 308 is connected to an external terminal (not shown) on the positive electrode side of the second power storage unit via a conductive member or the like. As described above, the power storage device 10 includes four external terminals including two positive-side external terminals and two negative-side external terminals.

  Here, let the connection surface with the 1st connection member 410 of the terminal of two 1st electrical storage units connected to the 1st connection member 410 be a 1st connection surface. For example, a connection surface 321a of the positive electrode terminal 321 of the power storage element 301 with the first connection member 410 and a connection surface 333a of the negative electrode terminal 333 of the power storage element 303 with the first connection member 410 are the first connection surfaces. Moreover, let the connection surface with the 2nd connection member 420 of the terminal of two 2nd electrical storage units connected to the 2nd connection member 420 be a 2nd connection surface. For example, the connection surface 322a of the positive electrode terminal 322 of the energy storage element 302 with the second connection member 420 and the connection surface 334a of the negative electrode terminal 334 of the energy storage element 304 with the second connection member 420 are the second connection surfaces. The same applies to the other connection surfaces.

  And the 2nd connection surface arrange | positioned between two 1st connection surfaces is arrange | positioned in the position different from the line segment which ties two 1st connection surfaces. In the present embodiment, at least one first connection surface of the two first connection surfaces is disposed at a position higher than the second connection surface disposed between the two first connection surfaces. That is, since the connection surface 321a and the connection surface 333a are disposed at a position higher than the connection surface 322a, the connection surface 322a is disposed at a position different from the line segment connecting the connection surface 321a and the connection surface 333a. ing. In other words, the line segment connecting the connection surface 321a and the connection surface 333a is disposed so as to straddle the connection surface 322a.

  Thus, the first connection member 410 extends from one first connection surface of the two first connection surfaces toward the other first connection surface and is connected to the two first connection surfaces. That is, the first connection member 410 is a rectangular and flat plate member extending in the X-axis direction, and extends from the connection surface 321a toward the connection surface 333a and is connected to the connection surface 321a and the connection surface 333a.

  Note that the heights of the connection surface 321a and the connection surface 333a are not particularly limited as long as the connection surface 322a is disposed at a position different from the line segment connecting the connection surface 321a and the connection surface 333a. For example, the connection surface 321a or the connection surface 333a may be disposed at the same height as the connection surface 322a or at a position lower than the connection surface 322a. However, the connection surface 321a and the connection surface 333a can be easily connected to the connection surface 321a and the connection surface 333a by configuring the first connection member 410 in a simple shape.

  Further, the second connection member 420 has a direction (in this embodiment) different from the direction (X-axis direction) from one of the two second connection surfaces toward the other second connection surface. Extends in the Y-axis direction) and is connected to the two second connection surfaces. Specifically, the second connection member 420 extends from the two second connection surfaces to the outside of the second power storage unit when viewed from the direction intersecting the second connection surface, and the two second connection surfaces Connected. The direction intersecting with the second connection surface is not particularly limited, but is, for example, the normal direction (Z-axis direction, upward) of the second connection surface, and viewed from the direction intersecting with the second connection surface. The term “te” can be paraphrased as, for example, a top view (plan view).

  That is, for example, the second connection member 420 arranged on the X axis direction minus side is outward from the second power storage unit (Y axis direction minus side) from the connection surfaces 322a and 334a in a top view (plan view). It extends and is connected to the connection surfaces 322a and 334a. In this way, the second connection member 420 is configured not to contact the first connection member 410.

  Here, the second connection member 420 has two upper surface portions 421 and a side surface portion 422 that connects the two upper surface portions 421. The upper surface portion 421 is a rectangular and flat portion that is disposed above the second power storage unit and extends in the Y-axis direction. The side surface portion 422 is disposed on the side of the second power storage unit and extends in the X-axis direction. It is a rectangular and flat part extending. That is, the second connection member 420 has a shape that is obtained by bending a plate-like member extending in the Y-axis direction to the negative side in the Z-axis direction. With this configuration, the second connecting member 420 is arranged to suppress the width of the power storage device 10 in the Y-axis direction from expanding.

  The direction in which the upper surface portion 421 extends is not limited to the Y-axis direction, and may be a direction inclined from the Y-axis direction to the X-axis direction plus side or the X-axis direction minus side. The direction in which the side surface portion 422 extends is not limited to the X-axis direction, and may be a direction inclined from the X-axis direction to the Z-axis direction plus side or the Z-axis direction minus side.

  As described above, the power storage device 10 according to the present embodiment includes the first power storage unit and the second power storage unit having different calorific values, and connects the terminals of the two first power storage units. The connection member 410 is not connected to the terminal of the second power storage unit, and the second connection member 420 that connects the terminals of the two second power storage units is not connected to the terminal of the first power storage unit. Here, when the first power storage unit and the second power storage unit are connected in series with the same connecting member, the current value is the same, and when connected in parallel, the voltage value is the same, but is connected to a different connecting member. Therefore, there is no limitation on the current value and voltage value, and the difference in the amount of heat generation tends to increase. That is, the power storage device 10 includes two power storage devices that tend to have a large difference in calorific value, that is, a power storage device having a plurality of first power storage units and a power storage device having a plurality of second power storage units. It has become. In such a configuration, the second power storage unit is disposed between the two first power storage units, and the first power storage unit is disposed between the two second power storage units. Thereby, the temperature distribution in the electrical storage apparatus 10 can be made uniform by disperse | distributing and arrange | positioning the 1st electrical storage unit and 2nd electrical storage unit from which the emitted-heat amount differs.

  In addition, the above configuration eliminates the need for an excessive configuration in which heat is not transmitted by increasing the thickness of the heat insulating material provided between the first power storage unit and the second power storage unit or widening the gap. Thus, the power storage device 10 can be reduced in size.

  In addition, the second connection surface that is the connection surface with the second connection member 420 of the terminal of the second power storage unit is the two first connection surfaces that are the connection surfaces with the first connection member 410 of the terminals of the two first power storage units. It is not placed on the line connecting the connection surfaces. For this reason, when connecting two 1st connection surfaces with the 1st connection member 410, it can suppress that a 2nd connection surface becomes obstructive.

  Further, at least one first connection surface is disposed at a position higher than the second connection surface, and the first connection member 410 extends from one first connection surface toward the other first connection surface, Connect to the two first connection surfaces. Thereby, the 1st connection member 410 can be set as the simple structure which connects two 1st connection surfaces linearly.

  In addition, the second connection member 420 extends in a direction different from the direction from the one second connection surface toward the other second connection surface and is connected to the two second connection surfaces, so that the second connection The member 420 can bypass the terminal of the first power storage unit and can be easily connected to the two second connection surfaces.

  In addition, when the gas discharge valve 340, the substrate, or the like is disposed between the positive electrode terminal 320 and the negative electrode terminal 330 of the second power storage unit, it is necessary to secure a gas discharge path, an arrangement space for the substrate, and the like. . For this reason, the second connection member 420 is configured to extend from the two second connection surfaces to the outside of the second power storage unit and be connected to the two second connection surfaces. Can be easily secured.

  As described above, in the power storage device 10, the first connection member 410 and the second connection member 420 are configured as described above, whereby the temperature distribution in the power storage device 10 can be easily made uniform.

(Modification 1)
Next, Modification 1 of the above embodiment will be described. FIG. 4A is a plan view showing a connection form between the electrode terminal of power storage element 300 and bus bar 400 and the configuration of bus bar 400 according to Modification 1 of the present embodiment. FIG. 4B is a side view showing a connection form between the electrode terminal of power storage element 300 and bus bar 400 and the configuration of bus bar 400 according to Modification 1 of the present embodiment. 4A is a diagram corresponding to FIG. 3A, and FIG. 4B is a diagram corresponding to FIG. 3B.

  In the above embodiment, the second connection member 420 extends from the two second connection surfaces to the outside of the second power storage unit and is connected to the two second connection surfaces. However, in this modification, the second connection member 430 extends from the two second connection surfaces to the inside of the second power storage unit and is connected to the two second connection surfaces. Since other configurations are the same as the configurations of the above-described embodiment, description thereof is omitted.

  Specifically, as shown in these drawings, for example, the second connection member 430 disposed on the minus side in the X-axis direction is connected to the second power storage unit from the connection surfaces 322a and 334a in a top view (plan view). Is connected to the connection surfaces 322a and 334a. More specifically, the second connection member 430 has two upper surface portions 431 and a connecting portion 432 that connects the two upper surface portions 431. The upper surface portion 431 is a rectangular and flat portion that is disposed above the second connection surface and extends in the Y-axis direction. The connecting portion 432 is disposed on the plus side of the upper surface portion 431 in the Y-axis direction, and X It is a rectangular and flat part extending in the axial direction.

  The direction in which the upper surface portion 431 extends is not limited to the Y-axis direction, and may be a direction inclined from the Y-axis direction to the X-axis direction plus side or the X-axis direction minus side. The direction in which the connecting portion 432 extends is not limited to the X-axis direction, and may be a direction inclined from the X-axis direction to the Y-axis direction plus side or the Y-axis direction minus side.

  As described above, according to the power storage device 10 according to the present modification, it is possible to achieve the same effects as in the above embodiment. In particular, in the present modification, the second connection member 430 can be formed without bending the plate-like member, and therefore the second connection member 430 can be easily manufactured. In addition, with this configuration, even if the second connection member 430 is disposed, the power storage device 10 does not increase in width in the Y-axis direction, and thus the power storage device 10 can be downsized.

(Modification 2)
Next, a second modification of the above embodiment will be described. FIG. 5A is a plan view showing a connection form between the electrode terminals of power storage element 300 and bus bar 400 and the configuration of bus bar 400 according to Modification 2 of the present embodiment. FIG. 5B is a side view showing a connection form between the electrode terminal of power storage element 300 and bus bar 400 and the configuration of bus bar 400 according to Modification 2 of the present embodiment. 5A is a diagram corresponding to FIG. 3A, and FIG. 5B is a diagram corresponding to FIG. 3B.

  In the said embodiment, a 2nd connection surface is arrange | positioned in the position different from the line segment which ties two 1st connection surfaces by arrange | positioning a 1st connection surface in a position higher than a 2nd connection surface. It was decided that However, in the present modification, the first connection surface is arranged at the same height as the second connection surface, but the second connection surface is a line segment connecting the two first connection surfaces as in the above embodiment. It is arranged at a position different from the above.

  Specifically, as shown in these drawings, the first power storage unit (power storage elements 301, 303, 305, and 307) is connected to the second connection surface of the second power storage unit (power storage elements 302, 304, 306, and 308). The first connection surface has the same height. Moreover, the 2nd electrical storage unit has a 2nd connection surface inside. That is, the second power storage unit has the positive electrode terminal and the negative electrode terminal closer to the center than the positive electrode terminal and the negative electrode terminal of the first power storage unit.

  With this configuration, the second connection surface disposed between the two first connection surfaces is different from the line segment connecting the two first connection surfaces when viewed from the direction intersecting the second connection surface. Is arranged. Further, the first connection surface disposed between the two second connection surfaces is disposed at a position different from the line segment connecting the two second connection surfaces when viewed from the direction intersecting the first connection surface. Has been. That is, the first connection surface and the second connection surface are arranged side by side in the X-axis direction at positions shifted in the Y-axis direction.

  The direction intersecting with the second connection surface is not particularly limited, but is, for example, the normal direction (Z-axis direction, upward) of the second connection surface, and viewed from the direction intersecting with the second connection surface. The term “te” can be paraphrased as, for example, a top view (plan view). The same applies to the direction intersecting the first connection surface.

  Thus, the first connection member 410 extends from one first connection surface of the two first connection surfaces toward the other first connection surface and is connected to the two first connection surfaces. The second connection member 440 extends from one second connection surface of the two second connection surfaces toward the other second connection surface and is connected to the two second connection surfaces. That is, both the first connection member 410 and the second connection member 440 are rectangular and flat members extending in the X-axis direction. Since other configurations are the same as the configurations of the above-described embodiment, description thereof is omitted.

  As described above, according to the power storage device 10 according to the present modification, it is possible to achieve the same effects as in the above embodiment. In particular, in the present modification, the first connection member 410 is not disposed on a line segment connecting the two first connection surfaces when the second connection surface is viewed from the direction intersecting the second connection surface. It connects with two 1st connection surfaces so that it may extend toward the other 1st connection surface from one 1st connection surface. Thereby, the 1st connection member 410 can be set as the simple structure which connects two 1st connection surfaces linearly. Further, when the first connection surface is viewed from the direction intersecting with the first connection surface, the second connection member 430 is not disposed on the line segment connecting the two second connection surfaces. It connects with two 2nd connection surfaces so that it may extend toward the other 2nd connection surface from a connection surface. Thereby, the 2nd connection member 430 can be set as the simple structure which connects two 2nd connection surfaces linearly.

  Note that the positions of the terminals of the first power storage unit and the second power storage unit are not limited to the above as long as the first connection member 410 and the second connection member 440 do not intersect. For example, the positive electrode terminal and the negative electrode terminal of the second power storage unit may not be disposed near the center, but the positive electrode terminal and the negative electrode terminal of the first power storage unit may be disposed near the center. Further, only one of the positive electrode terminal and the negative electrode terminal of the second power storage unit may be disposed near the center, and only the other of the positive electrode terminal and the negative electrode terminal of the first power storage unit may be disposed near the center. In this case, the shape of the lid of the container 310 of the power storage unit (power storage element 300) can be made common.

  In the present modification, the first connection surface is arranged at the same height as the second connection surface, but the first connection surface and the second connection surface may be arranged at different heights. The configuration of this modification can be realized.

(Modification 3)
Next, Modification 3 of the above embodiment will be described. FIG. 6A is a plan view showing a connection form between the electrode terminals of power storage element 300 and bus bar 400 and the configuration of bus bar 400 according to Modification 3 of the present embodiment. FIG. 6B is a side view showing a connection form between the electrode terminal of power storage element 300 and bus bar 400 and the configuration of bus bar 400 according to Modification 3 of the present embodiment. 6A is a diagram corresponding to FIG. 3A, and FIG. 6B is a diagram corresponding to FIG. 3B.

  In the said embodiment, a 2nd connection surface is arrange | positioned in the position different from the line segment which ties two 1st connection surfaces by arrange | positioning a 1st connection surface in a position higher than a 2nd connection surface. It was decided that However, in this modification, the first connection surface and the second connection surface are arranged at the same height, and the second connection surface is arranged on a line segment connecting the two first connection surfaces.

  Specifically, as shown in these drawings, the first connection member 450 has the same shape as the second connection member 430 in the first modification, and the second connection member 420 is the same as in the above embodiment. The second connecting member 420 has the same shape. With this configuration, the first connection member 450 and the second connection member 420 are opposite to the straight line connecting the first connection surface and the second connection surface from the two first connection surfaces and the two second connection surfaces. And connected to two first connection surfaces and two second connection surfaces.

  That is, the first connection member 450 extends from the first connection surface inward in the Y-axis direction, and the second connection member 420 extends from the second connection surface outward in the Y-axis direction. Note that the first connection member 450 may extend outward in the Y-axis direction from the first connection surface, and the second connection member 420 may extend inward in the Y-axis direction from the second connection surface. Alternatively, the extending direction of the first connecting member 450 and the second connecting member 420 may be a direction inclined from the Y-axis direction to the X-axis direction plus side or the X-axis direction minus side. Since other configurations are the same as the configurations of the above-described embodiment, description thereof is omitted.

  As described above, according to the power storage device 10 according to the present modification, it is possible to achieve the same effects as in the above embodiment. In particular, in this modification, the first connection surface and the second connection surface are arranged at the same height, and the first connection member 450 and the second connection member 420 are opposite to the first connection surface and the second connection surface. And connected to two first connection surfaces and two second connection surfaces. Therefore, even when the first connection surface and the second connection surface are arranged at the same height, the first connection member 450 and the second connection member 420 are connected to the terminals of the second power storage unit and the first power storage unit. By bypassing the terminal, the first connection member 450 and the second connection member 420 can be easily connected to the two first connection surfaces and the two second connection surfaces.

  In this modification, the first connection surface and the second connection surface are arranged at the same height, but the first connection surface and the second connection surface are arranged at different heights. In addition, the configuration of this modification can be realized.

(Modification 4)
Next, Modification 4 of the above embodiment will be described. FIG. 7A is a plan view showing a connection form between the electrode terminals of power storage element 300 and bus bar 400 and the configuration of bus bar 400 according to Modification 4 of the present embodiment. FIG. 7B is a side view showing a connection form between the electrode terminals of power storage element 300 and bus bar 400 and the configuration of bus bar 400 according to Modification 4 of the present embodiment. 7A is a diagram corresponding to FIG. 3A, and FIG. 7B is a diagram corresponding to FIG. 3B.

  In the said embodiment, a 2nd connection surface is arrange | positioned in the position different from the line segment which ties two 1st connection surfaces by arrange | positioning a 1st connection surface in a position higher than a 2nd connection surface. It was decided that However, in this modification, the first connection surface and the second connection surface are arranged at the same height, and the second connection surface is arranged on a line segment connecting the two first connection surfaces.

  Specifically, as shown in these drawings, the first connection member 460 extends from the two first connection surfaces to a position higher than the second connection surface and straddles the second connection surface. Connected to two first connection surfaces. That is, the first connection member 460 includes two upper surface portions 461 and a connecting portion 462 that connects the two upper surface portions 461. The upper surface portion 461 is a rectangular and flat portion disposed above the first connection surface and extending toward the Z axis direction plus side, and the connecting portion 462 is disposed on the Z axis direction plus side with respect to the upper surface portion 461. , A rectangular and flat portion extending in the X-axis direction.

  The direction in which the upper surface portion 461 extends is not limited to the Z-axis direction, and may be a direction inclined from the Z-axis direction to the plus side or the minus side in the X-axis direction or the Y-axis direction. The direction in which the connecting portion 462 extends is not limited to the X-axis direction, and may be a direction inclined from the X-axis direction to the plus side or the minus side in the Y-axis direction or the Z-axis direction.

  The second connection member 420 has the same shape as the second connection member 420 in the above embodiment. The second connection member 420 may have the same shape as the second connection member 430 in the first modification. Other configurations are the same as those in the above-described embodiment, and thus description thereof is omitted.

  As described above, according to the power storage device 10 according to the present modification, it is possible to achieve the same effects as in the above embodiment. In particular, in the present modification, even when the first connection surface and the second connection surface are arranged at the same height, the first connection member 460 has the second connection surface at a position higher than the second connection surface. By straddling, the first connection member 460 can be easily connected to the two first connection surfaces.

  In this modification, the first connection surface and the second connection surface are arranged at the same height, but the first connection surface and the second connection surface are arranged at different heights. In addition, the configuration of this modification can be realized.

(Modification 5)
Next, Modification 5 of the above embodiment will be described. FIG. 8 is a plan view schematically showing a configuration of power storage device 10a according to Modification 5 of the present embodiment.

  In the above-described embodiment, power storage device 10 includes a plurality of first power storage units having one power storage element, and includes a plurality of second power storage units having one power storage element and having a calorific value different from that of the first power storage unit. It was decided that However, in the present modification, the power storage device 10a includes a plurality of first power storage units having a plurality of power storage elements and a plurality of second power storage units having a plurality of power storage elements and different in calorific value from the first power storage unit. I have.

  Specifically, as shown in the figure, the power storage device 10a includes a plurality of power storage modules 11 and a plurality of power storage modules 12 alternately in the X-axis direction. The power storage module 11 includes a plurality of power storage elements 300a arranged in the Y-axis direction, and the power storage module 12 includes a plurality of power storage elements 300b arranged in the Y-axis direction. Here, the electricity storage element 300a and the electricity storage element 300b have different amounts of heat generation. For this reason, the heat storage module 11 and the power storage module 12 have different amounts of heat generation. That is, in this modification, the power storage module 11 corresponds to the first power storage unit, and the power storage module 12 corresponds to the second power storage unit.

  The power storage modules 11 and 12 have positive and negative terminals, respectively. The power storage device 10 a is connected to the first connection member connected to the terminals of the two power storage modules 11 without being connected to the terminals of the power storage module 12, and to the two terminals without being connected to the terminals of the power storage module 11. A second connection member connected to the terminal of the power storage module 12; In addition, since the structure of the terminal of a electrical storage module, a 1st connection member, and a 2nd connection member is the same as that of said embodiment or its modification, illustration is abbreviate | omitted.

  As described above, the power storage device 10a is connected to the two first power storage units without being connected to the terminal of the second power storage unit disposed between the two first power storage units, as in the above-described embodiment. The first connection member connected to the terminal and the second connection connected to the terminals of the two second power storage units without being connected to the terminal of the first power storage unit disposed between the two second power storage units And a connecting member.

  As described above, according to the power storage device 10a according to this modification, it is possible to achieve the same effects as in the above-described embodiment and the like. In particular, in the present modification, even in a configuration in which the power storage unit includes a plurality of power storage elements, the temperature distribution in the power storage device 10a is distributed by arranging the first power storage unit and the second power storage unit having different calorific values. Can be made uniform.

  The power storage device according to the embodiment of the present invention and the modification thereof has been described above, but the present invention is not limited to the above-described embodiment and the modification. In other words, it should be considered that the embodiment and its modification disclosed this time are illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  For example, in the said embodiment and its modification, the 1st electrical storage unit and the 2nd electrical storage unit decided to have the 1st connection surface and the 2nd connection surface which faced upwards. However, the first connection surface and the second connection surface may be oriented in any direction, for example, in directions in which the first connection surface and the second connection surface are different (the angle formed is 90 °, 180 °, etc.). If it faces, the 1st connection member and the 2nd connection member can be arranged without interfering with each other. Moreover, you may decide to arrange | position a 1st connection surface or a 2nd connection surface to the side surface and lower surface of an electrical storage unit. However, it is preferable that the first connection surface and the second connection surface face in the same direction because the connection work with the first connection member and the second connection member is easy.

  Moreover, in the said embodiment and its modification, the 1st connection member and the 2nd connection member decided to connect the 1st electrical storage unit and the 2nd electrical storage unit in series. However, the first connection member and the second connection member may be configured to connect the first power storage unit and the second power storage unit in parallel, or may be configured such that a part is connected in series and the remaining part is connected in parallel. But you can.

  Moreover, in the said embodiment and its modification, suppose that the 1st electrical storage unit and the 2nd electrical storage unit were arrange | positioned alternately. However, a plurality of second power storage units may be disposed between the two first power storage units, or a plurality of first power storage units may be disposed between the two second power storage units.

  In the above-described embodiment and its modification, the first power storage unit and the second power storage unit are configured not to be electrically connected within the power storage device, but outside the power storage device via an external terminal. It may be electrically connected.

  In addition, embodiments constructed by arbitrarily combining the constituent elements included in the above-described embodiment and its modifications are also included in the scope of the present invention.

  Further, the present invention can be realized not only as such a power storage device, but also as a connection member (first connection member, second connection member) provided in the power storage device.

  The present invention can be applied to a power storage device including a power storage element such as a lithium ion secondary battery.

10, 10a Power storage device 11, 12 Power storage module 300, 300a, 300b, 301-308 Power storage element 320, 321-328 Positive terminal 321a-328a, 331a-338a Connection surface 330, 331-338 Negative terminal 400 Bus bar 410, 450, 460 First connection member 420, 430, 440 Second connection member

Claims (9)

A power storage device including a plurality of first power storage units having one or more power storage elements and including a plurality of second power storage units having one or more power storage elements and different in calorific value from the first power storage unit,
A first connection member connected to the terminals of the two first power storage units without being connected to the terminals of the second power storage unit disposed between the two first power storage units;
A power storage device comprising: a second connection member connected to a terminal of the two second power storage units without being connected to a terminal of the first power storage unit disposed between the two second power storage units. A connection surface of the terminals of the two first power storage units with the first connection member is a first connection surface, and a connection surface of the terminals of the two second power storage units with the second connection member is a second connection surface. The power storage device according to claim 1, wherein the second connection surface disposed between the two first connection surfaces is disposed at a position different from a line segment connecting the two first connection surfaces. apparatus. At least one first connection surface of the two first connection surfaces is disposed at a position higher than the second connection surface disposed between the two first connection surfaces,
The first connection member extends from one first connection surface of the two first connection surfaces toward the other first connection surface and is connected to the two first connection surfaces. The power storage device described. The second connection member extends from one second connection surface of the two second connection surfaces in a direction different from the direction toward the other second connection surface, and the two second connection surfaces The power storage device according to claim 3 connected. The second connection member extends from the two second connection surfaces to the outside of the second power storage unit when viewed from a direction intersecting the second connection surface, and is connected to the two second connection surfaces. The power storage device according to claim 4. The second connection surface disposed between the two first connection surfaces is at a position different from the line segment connecting the two first connection surfaces when viewed from the direction intersecting the second connection surface. Arranged,
The first connection member extends from one first connection surface of the two first connection surfaces toward the other first connection surface and is connected to the two first connection surfaces. 4. The power storage device according to 3. The first connection surface disposed between the two second connection surfaces is at a position different from a line segment connecting the two second connection surfaces when viewed from the direction intersecting the first connection surface. Arranged,
The second connection member extends from one second connection surface of the two second connection surfaces toward the other second connection surface and is connected to the two second connection surfaces. The power storage device described. A connection surface of the terminals of the two first power storage units with the first connection member is a first connection surface, and a connection surface of the terminals of the two second power storage units with the second connection member is a second connection surface. And the two first connection surfaces and the two second connection surfaces are arranged at the same height,
The first connection member and the second connection member are opposite to a straight line connecting the first connection surface and the second connection surface from the two first connection surfaces and the two second connection surfaces. The power storage device according to claim 1, wherein the power storage device is connected to the two first connection surfaces and the two second connection surfaces. A connection surface of the terminals of the two first power storage units with the first connection member is a first connection surface, and a connection surface of the terminals of the two second power storage units with the second connection member is a second connection surface. And the two first connection surfaces and the two second connection surfaces are arranged at the same height,
The first connection member extends from the two first connection surfaces to a position higher than the second connection surface, and is connected to the two first connection surfaces across the second connection surface. The power storage device according to claim 1.

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