Voltage detection unit and power storage device

Abstract

To provide a voltage detection unit excellent in workability in a conductive connection with a detection target.SOLUTION: A voltage detection unit 105 includes: a voltage detection terminal 110 having a first location 112a configured to be conductively connected to a detection target 104; a plate-shaped housing 140 having a terminal accommodating recess 142 accommodating the voltage detection terminal 110; a cover 130 configured to be locked to the housing 140 at a temporary locking position where the first location 112a of the voltage detection terminal 110 accommodated in the terminal accommodating recess 142 is not covered and a final locking position where the first location 112a is covered; a temperature measurer 170 accommodating a temperature-measuring element 171 therein and attached to the housing 140; and an electric wire 120 conductively connected to a second location 113a of the voltage detection terminal 110 and drawn out to the outside of the housing 140. The temperature measurer 170 is engaged with the voltage detection terminal 110 such that the voltage detection terminal 110 accommodated in the terminal accommodating recess 142 is restricted to move in a plate thickness direction of the housing 140.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a voltage detection unit configured so that a voltage detection terminal to be electrically connected to an object to be detected is accommodated in a plate-shaped housing, and to an electricity storage device using the voltage detection unit. [Background technology]

[0002] Conventionally, stacked energy storage devices have been proposed, which are configured by repeatedly stacking thin, chargeable and dischargeable energy storage modules and conductive plates in an alternating arrangement, thereby connecting multiple energy storage modules in series via the conductive plates. The energy storage modules used in this type of energy storage device generally have a structure in which multiple battery cells are built in and function as a single chargeable and dischargeable battery. In one conventional energy storage device, in order to monitor the output state of each energy storage module (i.e., the potential of the output surface of each energy storage module relative to a reference zero potential; hereinafter, also simply referred to as the "voltage of the energy storage module"), detection terminals such as bus bars are connected to conductive plates in contact with the output surface of each energy storage module, and the voltage of each energy storage module is measured via these detection terminals (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-161340 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when actually connecting a bus bar or the like to a conductive plate in an energy storage device having the above-described structure, it is difficult to secure space for installing other connection components (e.g., bolts for bolt fastening) because the energy storage module and the conductive plate are thin-plate shaped. Therefore, in the above-described conventional energy storage device, insertion holes for inserting detection terminals are provided on the side edges of the conductive plate, and the detection terminals are connected to the conductive plate by inserting the detection terminals into the insertion holes of each conductive plate from the side of the stack of energy storage modules and conductive plates. However, with this conventional connection method, it is difficult to improve the workability of the connection work because it is cumbersome to align the insertion holes of the conductive plate with the detection terminals when inserting the detection terminals.

[0005] An object of the present invention is to provide a voltage detection unit that is easy to work with for conductive connection to an object to be detected, and a power storage device that uses the voltage detection unit. [Means for solving the problem]

[0006] In order to achieve the above object, the voltage detection unit and the power storage device according to the present invention are characterized as follows.

[0007] a voltage detection terminal having a first portion that is electrically connected to a detection target; a plate-shaped housing having a terminal accommodating recess for accommodating the voltage detection terminal; a cover that can be engaged with the housing at a temporary engagement position that does not cover the first location of the voltage detection terminal accommodated in the terminal accommodating recess, and at a full engagement position that covers the first location; a temperature detector having a temperature measuring element housed therein and attached to the housing; an electric wire electrically connected to a second location of the voltage detection terminal and drawn out toward the outside of the housing; A voltage detection unit comprising: The thermometer is The temperature detector is disposed so that at least a portion of the temperature detector overlaps with the voltage detection terminal in the thickness direction of the housing, so as to restrict the voltage detection terminal accommodated in the terminal accommodating recess from moving in the thickness direction of the housing. It is a voltage detection unit.

[0008] a plate-shaped conductive module including the voltage detection unit and a conductive plate as a detection target to which the voltage detection terminal is electrically connected; a chargeable and dischargeable storage module in which the conductive modules are stacked; It is a power storage device comprising: [Effects of the Invention]

[0009] According to the voltage detection unit and power storage device of the present invention, the voltage detection terminal, to which the electric wire is connected at a second location, is accommodated in the terminal accommodation recess of the housing, and the cover can be engaged with the housing while leaving the first location of the voltage detection terminal exposed. Therefore, when electrically connecting the voltage detection unit to a detection target (e.g., a conductive plate used in a stacked power storage device), the voltage detection unit can be assembled to the detection target, and then the exposed first location of the voltage detection terminal can be fixed to the detection target using techniques such as ultrasonic bonding or welding. This eliminates the need for additional connection components compared to typical bolt fastening, and facilitates alignment of the two and reduces contact resistance at the contact points compared to the conventional connection methods described above. After connecting the detection target and the voltage detection terminal, placing the cover in the fully engaged position protects the first location of the voltage detection terminal (i.e., the contact point between the two).

[0010] Furthermore, by attaching a temperature detector (e.g., a thermistor) to the housing before attaching the cover to the housing as described above, at least a portion of the temperature detector overlaps with the voltage detection terminal in the thickness direction, thereby preventing the voltage detection terminal housed in the terminal accommodating recess from moving in the thickness direction (so-called "riding-up of the voltage detection terminal"). At least a portion of the temperature detector may be in contact with the voltage detection terminal, or may be separated from the voltage detection terminal by a gap that is acceptable from the perspective of restricting the movement of the voltage detection terminal. This prevents, for example, the voltage detection terminal housed in the terminal accommodating recess from unintentionally moving in the thickness direction, which would prevent the attachment of the cover to the housing. Furthermore, if the voltage detection terminal moves in the thickness direction from its intended location before the temperature detector is attached (for example, if the voltage detection terminal is not properly housed in the terminal accommodating recess and rides up around the periphery of the terminal accommodating recess), the voltage detection terminal will prevent the temperature detector from being attached to the housing, making it possible to detect that the voltage detection terminal is not properly housed in the terminal accommodating recess.

[0011] Therefore, the voltage detection unit and the power storage device according to the present invention have excellent workability in electrically conductive connection with the detection target. Furthermore, the voltage detection unit and the power storage device having the above configuration allow the voltage detection terminal and the cover to be easily and properly assembled to the housing.

[0012] The present invention has been briefly described above. The details of the present invention will become clearer by reading the following detailed description of the invention (hereinafter referred to as "embodiments") with reference to the accompanying drawings. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a partially exploded perspective view of a stacked-type electricity storage device including a voltage detection unit according to this embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 3] FIG. 3 is an enlarged view of part B in FIG. [Figure 4] FIG. 4 is an exploded perspective view of the voltage detection unit shown in FIG. [Figure 5] FIG. 5 is a perspective view for explaining the operation when the voltage detection terminal is accommodated in the housing. [Figure 6] FIG. 6 is a top view showing a housing in which the voltage detection terminal and the electric wire are housed, a cover, and a thermistor. [Figure 7] FIG. 7 is a top view for explaining the operation when the thermistor is attached to the housing shown in FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along line CC in FIG. [Figure 9] FIG. 9 is a top view for explaining the operation when attaching the cover to the housing shown in FIG. [Figure 10] FIG. 10 is a cross-sectional view taken along line DD in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] <Embodiment> The voltage detection unit 105 and the power storage device 101 according to this embodiment will be described below with reference to the drawings. For ease of explanation, the following terms are defined as "front-rear direction," "left-right direction," "up-down direction," "front," "rear," "left," "right," "up," and "down" as shown in Fig. 1 etc. The "front-rear direction," "left-right direction," and "up-down direction" are perpendicular to each other.

[0015] The voltage detection unit 105 is typically used in a stacked-type energy storage device 101 shown in Fig. 1. The energy storage device 101 is configured by stacking rectangular thin-plate chargeable and dischargeable energy storage modules 102 and rectangular thin-plate conductive modules 103 that can electrically connect adjacent energy storage modules 102 alternately in the vertical direction. In the energy storage device 101, the multiple energy storage modules 102 are electrically connected in series via the conductive modules 103. The energy storage module 102 has a structure in which multiple battery cells (not shown) are built in, and the energy storage module 102 as a whole functions as a single chargeable and dischargeable battery.

[0016] 1, the conductive module 103 is configured to have an overall rectangular thin plate shape, including a rectangular thin plate-shaped conductive plate 104 (note that the conductive plate 104 also functions as a heat sink, as will be described later), a rectangular thin plate-shaped voltage detection unit 105 connected to the left side of the conductive plate 104, and a rectangular thin plate-shaped opposing unit 106 connected to the right side of the conductive plate 104. As shown in FIGS. 1 to 3 (see FIG. 2 in particular), the conductive plate 104 and the voltage detection unit 105 are connected to each other by fitting a flange portion 104a extending in the front-rear direction provided on the left end surface of the conductive plate 104 into a recessed portion 105a extending in the front-rear direction provided on the right end surface of the voltage detection unit 105. The conductive plate 104 and the opposing unit 106 are connected to each other by fitting a flange portion 104b extending in the front-to-rear direction on the right end surface of the conductive plate 104 into a recess portion 106a extending in the front-to-rear direction on the left end surface of the opposing unit 106.

[0017] 2, in each conductive module 103 located between vertically adjacent power storage modules 102, the conductive plate 104 is in direct contact with the upper and lower power storage modules 102. Therefore, the conductive plate 104 functions to provide electrical continuity between the lower surface of the upper power storage module 102 and the upper surface of the lower power storage module 102, and also functions as a heat sink that releases heat generated from the upper and lower power storage modules 102 to the outside.

[0018] In each conductive module 103 located between vertically adjacent storage modules 102, the voltage detection unit 105 includes a voltage detection terminal 110 (see FIG. 2 ), which will be described later and which contacts the conductive plate 104. The voltage detection unit 105 functions to output a signal indicating the voltage between the upper and lower storage modules 102 (specifically, the potential of the upper surface (output surface) of the lower storage module 102 relative to a reference zero potential) via an electric wire 120 (see FIG. 1 , etc.) connected to the voltage detection terminal 110. Note that although the voltage detection unit 105 is arranged on the left side of the conductive plate 104 in FIGS. 1 to 3 , a voltage detection unit having the same function as the voltage detection unit 105 may be arranged on the right side of the conductive plate 104. In this case, a voltage detection unit obtained by reversing the overall configuration of the voltage detection unit 105 (i.e., a mirror product of the voltage detection unit 105) is used as the voltage detection unit having the same function as the voltage detection unit 105.

[0019] In each conductive module 103 located between adjacent storage modules 102 above and below, one of a voltage detection unit, a dummy unit, and a temperature detection unit is applied as the opposing unit 106 depending on the specifications of the storage device 101.

[0020] When opposing unit 106 is a voltage detection unit, a voltage detection unit obtained by reversing the overall configuration of voltage detection unit 105 (i.e., a mirror product of the voltage detection unit 105 described above) is used as opposing unit 106. In this case, voltage detection unit 105 is disposed on the left side of conductive plate 104, and a mirror product of voltage detection unit 105 is disposed on the right side of conductive plate 104. Opposing unit 106 (mirror product of voltage detection unit 105) performs the same function as voltage detection unit 105.

[0021] When the opposing unit 106 is a dummy unit, a simple resin plate having a recess 106a (see FIG. 2) extending in the front-to-rear direction is used as the opposing unit 106. In this case, the opposing unit 106 only serves to fill the gap between the upper and lower power storage modules 102.

[0022] When the opposing unit 106 is a temperature detection unit, a structure in which a temperature sensor (not shown) is incorporated into a resin plate used as a dummy unit is used as the opposing unit 106. In this case, the opposing unit 106 functions to output a signal indicating the temperatures of the upper and lower power storage modules 102 via an electric wire 107 (see FIG. 1) connected to this temperature sensor.

[0023] A specific configuration of the voltage detection unit 105 according to this embodiment will be described below with reference to Fig. 4 to Fig. 10. As shown in Fig. 4, the voltage detection unit 105 includes a housing 140, a voltage detection terminal 110 housed in the housing 140, an electric wire 120 connected to the voltage detection terminal 110 and housed in the housing 140, a cover 130 attached to the housing 140, and a thermistor 170 attached to the housing 140. The thermistor 170 corresponds to the "thermometer" in the present invention.

[0024] The voltage detection terminal 110 is accommodated in a terminal accommodating recess 142 (see FIG. 4) which will be described later and which is formed in the housing 140, the electric wire 120 is accommodated in an electric wire accommodating recess 146 (see FIG. 4) which will be described later and which is formed in the housing 140, the cover 130 is attached to a cover attachment recess 141 (see FIG. 4) which will be described later and which is formed in the housing 140, and the thermistor 170 is attached to a thermistor attachment recess 161 (see FIG. 4) which will be described later and which is formed in the housing 140. Each of the components which make up the voltage detection unit 105 will be described below in order.

[0025] First, the voltage detection terminal 110 will be described. The metal voltage detection terminal 110 is formed by performing processing such as pressing on a single metal plate. The voltage detection terminal 110 is accommodated from above in a terminal accommodating recess 142 of the housing 140. As shown in FIGS. 4 and 5 , the voltage detection terminal 110 has a rectangular flat plate-like first portion 111 extending in the front-rear direction, a rectangular flat plate-like second portion 112 extending rightward from the rear end of the first portion 111, and a rectangular flat plate-like third portion 113 extending leftward from the front end of the first portion 111, and has a generally crank-like flat plate-like shape as a whole when viewed from the top-bottom direction.

[0026] One end of the electric wire 120 is fixed to the tip 113a (i.e., the end on the left side) of the third portion 113 so as to be electrically connected. The other end of the electric wire 120 is connected to a voltage measurement device (not shown) outside the power storage device 101. A part of the flange portion 104a of the conductive plate 104 is fixed to the underside of the tip 112a (i.e., the end on the right side) of the second portion 112 by a method such as ultrasonic bonding or welding (see FIG. 3).

[0027] The voltage detection terminal 110 is provided with an extension portion 114 that extends further rearward from the rear end of the first portion 111. Specifically, the extension portion 114 is composed of a first extension portion 114a that extends further rearward from the rear end of the first portion 111, and a second extension portion 114b that extends downward (in the thickness direction of the voltage detection terminal 110) from the extending end of the first extension portion 114a. The downward extension length of the second extension portion 114b is greater than the thickness of the voltage detection terminal 110. When the voltage detection terminal 110 is accommodated in the housing 140, the extension portion 114 is accommodated in an accommodating recess 162 (see FIGS. 4 and 8, etc.) formed in the thermistor mounting recess 161. The effect of providing the extension portion 114 on the voltage detection terminal 110 will be described later.

[0028] Next, the cover 130 will be described. The cover 130 is a resin molded product, and is attached to the cover attachment recess 141 of the housing 140 from the left. As shown in FIG. 4 and other figures, the cover 130 is composed of a facing portion 131 and an extending portion 132 that extends forward from the facing portion 131. The facing portion 131 mainly functions to cover and protect the voltage detection terminal 110, and the extending portion 132 mainly functions to cover and protect the electric wire 120.

[0029] The facing portion 131 is composed of a pair of flat plate portions 133 facing each other with a gap in the up-down direction, and a connecting portion 134 that connects the left end edges of the pair of flat plate portions 133 extending in the front-rear direction in the up-down direction over the entire front-rear direction. When viewed in the front-rear direction, the facing portion 131 has a generally U-shape that opens to the right. The right end edge of each flat plate portion 133 has a stepped shape that slopes leftward as it extends forward. The extending portion 132 extends flush and continuously forward from the front end edge of the upper flat plate portion 133 of the pair of flat plate portions 133 that make up the facing portion 131, and has a generally rectangular flat plate shape.

[0030] A pair of wire holding pieces 135 extending in the left-right direction are integrally formed on the extending portion 132 so as to be spaced apart in the front-rear direction. Each wire holding piece 135 protrudes downward from the underside of the extending portion 132, extends in the left-right direction, and protrudes further rightward from the right edge of the extending portion 132. When the cover 130 is attached to the housing 140, the wire holding pieces 135 function to hold the wires 120 housed in the housing 140.

[0031] Of the pair of flat plate portions 133 constituting the facing portion 131, a locking portion 136 that protrudes upward toward the upper flat plate portion 133 is formed at a predetermined location on the lower flat plate portion 133 (see FIG. 10). The locking portion 136 functions to lock the cover 130 at a temporary locking position (not shown) and a regular locking position (see FIGS. 9 and 10) in cooperation with a temporary locking portion 154 and a regular locking portion 155, which are provided on the housing 140 and will be described later. A protrusion 137 that protrudes rearward is provided on the rear side wall of the cover 130 (i.e., the side wall that connects the rear end edges of the pair of flat plate portions 133 in the left-right direction).

[0032] Next, the housing 140 will be described. The housing 140 is a resin molded product, and as shown in Fig. 1 etc., has a generally rectangular thin plate shape extending in the front-rear direction. A recess 105a that is recessed to the left and extends in the front-rear direction is formed on the right end surface of the housing 140. A flange portion 104a of the conductive plate 104 is fitted into the recess 105a (see Fig. 2).

[0033] At the locations on the top and bottom surfaces of the housing 140 where the cover 130 is attached, cover attachment recesses 141 are formed that are recessed and have a shape that corresponds to the overall shape of the cover 130 (see FIGS. 4 to 6). The recess depth (depth in the vertical direction) of the cover attachment recess 141 is equal to the thickness of the resin material that constitutes the cover 130 (facing portion 131+extending portion 132). Therefore, when the cover 130 is attached to the housing 140, the surfaces of the housing 140 and the cover 130 are flush with each other (see FIGS. 1 and 9).

[0034] A terminal accommodating recess 142 having a shape corresponding to the overall shape of the voltage detection terminal 110 is formed in the bottom surface 141a of the cover mounting recess 141 on the upper side of the housing 140 at a location where the voltage detection terminal 110 is accommodated (see FIGS. 4 and 5). The recess depth (depth in the vertical direction) of the terminal accommodating recess 142 is equal to the plate thickness of the voltage detection terminal 110. Therefore, when the voltage detection terminal 110 is mounted in the housing 140, the top surface of the voltage detection terminal 110 and the bottom surface 141a of the cover mounting recess 141 are flush with each other.

[0035] A notch 143 recessed toward the left and having a generally rectangular shape when viewed from the top and bottom is formed on the right edge of the housing 140 at a position in the front-to-back direction where the tip 112a of the voltage detection terminal 110 is located. The recess 105a extending in the front-to-back direction on the right end face of the housing 140 is divided by the notch 143. When the voltage detection terminal 110 is accommodated in the housing 140, the top and bottom surfaces of the tip 112a of the voltage detection terminal 110 are exposed by the notch 143.

[0036] A through-hole 144 extending in the front-rear direction and penetrating in the up-down direction is formed in the terminal accommodating recess 142 at a location where the tip 113a of the voltage detection terminal 110 is disposed (see FIGS. 4 and 5). When the voltage detection terminal 110 is accommodated in the housing 140, one end (contact point) of the electric wire 120 connected to the voltage detection terminal 110 enters the through-hole 144 (see FIGS. 6 and 7). In other words, the through-hole 144 functions as a relief portion to prevent interference between the bottom surface 142a of the terminal accommodating recess 142 and the one end of the electric wire 120.

[0037] An electric wire accommodating recess 146 is formed in the bottom surface 141a of the upper cover mounting recess 141 of the housing 140 at a location where the electric wire 120 is accommodated (see FIGS. 4 and 5). In this example, the electric wire accommodating recess 146 is a groove extending linearly in the front-to-rear direction. The rear end of the electric wire accommodating recess 146 communicates with the terminal accommodating recess 142, and the front end of the electric wire accommodating recess 146 forms an electric wire outlet 149 through which the electric wire 120 extends from the front edge of the housing 140.

[0038] The wire accommodating recess 146 is provided at two locations spaced apart in the front-rear direction with narrow recesses 151, which are recesses that are narrower in width (left-right spacing) than the other portions of the wire accommodating recess 146. The width of the narrow recesses 151 is slightly smaller than the outer diameter of the wire 120. Therefore, the narrow recesses 151 function to clamp the wire 120 while pressing it in the left-right direction. By clamping the wire 120 between the pair of narrow recesses 151, even if an unintended external force is applied to the wire 120 pulled out of the housing 140, the external force can be resisted by the friction between the narrow recesses 151 and the wire 120. Therefore, a large external force is unlikely to be applied to the contact point between the voltage detection terminal 110 and the wire 120.

[0039] At the location on the bottom surface 141a of the upper cover mounting recess 141 of the housing 140 where the pair of wire holding pieces 135 of the cover 130 are arranged, a pair of wire holding piece recesses 152 extending in the left-right direction are formed so as to be spaced apart in the front-to-rear direction in correspondence with the pair of wire holding pieces 135, as shown in Figures 4 and 5.

[0040] Each electric wire retaining piece recess 152 extends in the left-right direction from the left edge of the upper surface of the housing 140, across the electric wire accommodating recess 146, to a right-end inner wall 141b (see FIGS. 4 and 5) that defines the right end of the upper cover attachment recess 141. Storage holes 153 recessed toward the right are formed in the right-end inner wall 141b of the upper cover attachment recess 141 at locations where the pair of electric wire retaining piece recesses 152 connect (see FIGS. 4 and 5). When the cover 130 is attached to the housing 140, the extending ends (i.e., right ends) of the pair of electric wire retaining pieces 135 of the cover 130 are inserted into and stored in the pair of storage holes 153.

[0041] 10, a temporary locked portion 154 and a permanent locked portion 155, which are upwardly recessed recesses, are formed on the bottom surface 141a of the cover mounting recess 141 on the lower side of the housing 140. The temporary locked portion 154 and the permanent locked portion 155 are provided at locations where the locking portion 136 of the cover 130 is located when it is in the temporary locked position (not shown) and the permanent locked position (see FIGS. 9 and 10), respectively. Specifically, the temporary locked portion 154 and the permanent locked portion 155 are arranged side by side in the left-right direction, with the permanent locked portion 155 located to the right of the temporary locked portion 154.

[0042] At the left edge of the housing 140 extending in the front-to-rear direction, where the thermistor 170 is mounted, i.e., at the location adjacent to the rear side of the upper and lower cover mounting recesses 141, a thermistor mounting recess 161 is formed which has a shape corresponding to the overall shape of the thermistor 170 (of its main body portion 172, which will be described later) and which is recessed toward the right in an approximately rectangular shape when viewed from the top-to-bottom direction (see Figures 4 to 6).

[0043] The thermistor 170 is a component that measures the temperature of the voltage detection terminal 110 and is mounted in the thermistor mounting recess 161 of the housing 140 from the left. Specifically, as shown in FIG. 8, the thermistor 170 includes a thermistor element 171 constituting a temperature measuring element and a resin-made main body 172 that houses the thermistor element 171. The main body 172 has a generally rectangular parallelepiped shape extending in the left-right direction and includes an internal space 172a therein in which the thermistor element 171 is housed (see FIG. 8). A sealant 173 is filled in the gap between the thermistor element 171 housed in the internal space 172a and the inner wall surface that defines the internal space 172a (see FIG. 8). The thickness (vertical length) of the main body 172 is equal to the depth (vertical length) of the thermistor mounting recess 161 (= the plate thickness of the resin material that forms the housing 140). Therefore, when the thermistor 170 is attached to the housing 140, the surface of the housing 140 and the surface of the main body 172 are flush with each other (see FIGS. 7 to 9).

[0044] One end of an electric wire 180 is fixed so as to be electrically connected to the thermistor element 171 inside the main body 172. The electric wire 180 connected to the thermistor element 171 extends rearward from the left end of the main body 172 toward the outside of the main body 172 (see FIGS. 4 and 6, etc.). The other end of the electric wire 180 is connected to a temperature measuring device (not shown) outside the power storage device 101.

[0045] A protruding plate portion 174 that protrudes forward and extends in the left-right direction is integrally provided at the upper right end of the approximately rectangular parallelepiped-shaped main body portion 172 that extends in the left-right direction (see FIGS. 4, 6 to 9). When the thermistor 170 is attached to the housing 140, the protruding plate portion 174 engages with the extending portion 114 (more specifically, the first extending portion 114a) of the voltage detection terminal 110 housed in the terminal accommodating recess 142 (see FIG. 8). Locking portions 175 are provided on both front and rear outer surfaces of the main body portion 172 (see FIGS. 4 and 6). When the thermistor 170 is attached to the housing 140, the locking portions 175 are locked by locked portions 163 (described later) provided in the thermistor mounting recess 161. In this example, the locking portions 175 are formed as recesses provided in grooves that extend in the left-right direction and are provided in the front and rear side walls of the main body portion 172. A notched recess 176 extending in the left-right direction is provided in the side wall on the front side of the main body 172. When the cover 130 and thermistor 170 are attached to the housing 140, the protrusion 137 of the cover 130 fits into the recess 176.

[0046] The upper part of the front inner wall at the bottom (right end) of the thermistor mounting recess 161 communicates with the rear end of the terminal accommodating recess 142, and an accommodating recess 162 is formed in the upper part of the front inner wall. The accommodating recess 162 is a groove adjacent to the rear side of the rear edge of the bottom surface 142a of the terminal accommodating recess 142 and recessed below the bottom surface 142a. Locking portions 163 are provided on both the front and rear inner surfaces of the thermistor mounting recess 161. In this example, the locking portions 163 are composed of a cantilever-shaped locking piece that extends in the left-right direction so as to be adjacent to and along the front inner surface of the thermistor mounting recess 161, and a locking ridge that extends in the left-right direction and is provided on the rear inner surface of the thermistor mounting recess 161 itself. A recess 164 that is recessed to the right and extends in the front-rear direction is formed in the left end face of the housing 140, which is a generally rectangular thin plate extending in the front-rear direction, in the entire front-rear direction area rearward of the thermistor mounting recess 161 (see FIGS. 4 and 5). The recess 164 is intended to accommodate the electric wire 180 extending from the thermistor 170 (see FIGS. 7 and 9). The components that make up the voltage detection unit 105 have been described above.

[0047] Next, a procedure for assembling the voltage detection terminal 110, the thermistor 170, and the cover 130 into the housing 140 will be described. First, the voltage detection terminal 110, to which the electric wire 120 has been previously connected, is accommodated in the terminal accommodating recess 142 of the housing 140. To achieve this, the voltage detection terminal 110 is fitted into the terminal accommodating recess 142 of the housing 140 from above so that one end (contact point) of the electric wire 120 enters the through-hole 144 (see the white arrow in FIG. 5). Here, the voltage detection terminal 110 has a shape that does not interfere with the housing 140 (the terminal accommodating recess 142) between an accommodation position where the voltage detection terminal 110 is accommodated in the terminal accommodating recess 142 (the position of the voltage detection terminal 110 shown in FIG. 6) and an external position (the position of the voltage detection terminal 110 shown in FIG. 5) assumed to be obtained by moving the voltage detection terminal 110 from the accommodation position in the plate thickness direction (up and down direction) away from the housing 140. As a result, when accommodating the voltage detection terminal 110 in the terminal accommodating recess 142, the voltage detection terminal 110 can be accommodated in the terminal accommodating recess 142 simply by moving the entire voltage detection terminal 110 linearly downward (in the plate thickness direction) toward the terminal accommodating recess 142 while maintaining the terminal accommodating recess 142 in a horizontal position (perpendicular to the up-down direction).

[0048] When the voltage detection terminal 110 is completely accommodated in the housing 140, the upper and lower surfaces of the tip portion 112a of the voltage detection terminal 110 are exposed by the notch 143 (see FIGS. 6 and 7). Furthermore, the second extending portion 114b of the extending portion 114 of the voltage detection terminal 110 is accommodated in the accommodating recess 162 of the thermistor mounting recess 161 so that the first extending portion 114a of the extending portion 114 closes the upper opening of the accommodating recess 162 (see FIG. 8).

[0049] Next, the electric wire 120 extending from the voltage detection terminal 110 accommodated in the housing 140 is accommodated in the electric wire accommodating recess 146 of the housing 140. For this purpose, the electric wire 120 is fitted from above along the electric wire accommodating recess 146. At this time, by pushing the pair of portions of the electric wire 120 located at the top of the pair of narrow recesses 151 downward, the pair of portions of the electric wire 120 are accommodated inside the pair of narrow recesses 151. When the accommodation of the electric wire 120 in the housing 140 is complete, the electric wire 120 extends forward from the electric wire outlet 149 to the outside of the housing 140.

[0050] Next, the thermistor 170 is mounted in the housing 140. To do this, the main body 172 of the thermistor 170 is fitted from the left into the thermistor mounting recess 161 of the housing 140 so that the locking portion 175 of the main body 172 is locked with the locked portion 163 of the thermistor mounting recess 161 (see the white arrow in FIG. 7). Then, the electric wire 180 extending rearward from the left end portion of the main body 172 is housed in a recess 164 (see FIGS. 4 and 5) that is provided on the left end face of the housing 140 and extends in the front-to-rear direction, and extends to the outside of the housing 140 through the rear-end opening of the recess 164 (see FIG. 1).

[0051] 8, when the thermistor 170 is completely attached to the thermistor attachment recess 161, the protruding plate portion 174 provided on the main body 172 of the thermistor 170 is engaged with the first extending portion 114a of the extending portion 114 of the voltage detection terminal 110 so as to overlap the upper side of the first extending portion 114a. This restricts the voltage detection terminal 110 housed in the terminal accommodating recess 142 from moving upward (in the plate thickness direction). This prevents, for example, the voltage detection terminal 110 housed in the terminal accommodating recess 142 from unintentionally moving upward (in the plate thickness direction) and interfering with the attachment of the cover 130 to the housing 140. Furthermore, if the voltage detection terminal 110 has moved upward (in the plate thickness direction) from its original accommodation position before the thermistor 170 is attached to the housing 140 (for example, if the voltage detection terminal 110 is not properly accommodated in the terminal accommodating recess 142 and rides up on the periphery of the terminal accommodating recess 142), the protruding plate portion 174 interferes with the first extending portion 114a of the extending portion 114, preventing the thermistor 170 from being attached to the housing 140 by the voltage detection terminal 110, making it possible to detect that the voltage detection terminal 110 is not properly accommodated in the terminal accommodating recess 142. Note that in this example, the protruding plate portion 174 of the thermistor 170 is in contact with the first extending portion 114a of the voltage detection terminal 110, but the protruding plate portion 174 and the first extending portion 114a may be separated by a gap that is acceptable in terms of the above regulations.

[0052] Furthermore, when the thermistor 170 is completely attached to the thermistor attachment recess 161, the second extension portion 114b of the extension portion 114 of the voltage detection terminal 110 is disposed adjacent to the right side of the main body portion 172 of the thermistor 170 (see FIG. 8 ). The second extension portion 114b of the voltage detection terminal 110 and the main body portion 172 of the thermistor 170 may be in contact with each other, or may be separated by an allowable gap from the viewpoint of improving heat transfer, which will be described later. This allows heat from the second extension portion 114b (i.e., the voltage detection terminal 110) to be transferred to the thermistor element 171 housed in the main body portion 172 via the main body portion 172 and the sealing material 173 filled in the internal space 172a of the main body portion 172, in that order, thereby enabling the thermistor 170 to measure the temperature of the voltage detection terminal 110. Here, the main body 172 of the thermistor 170 is adjacent to the second extending portion 114b of the voltage detection terminal 110, which extends downward (in the plate thickness direction of the voltage detection terminal 110). This increases the area that contributes to heat transfer from the voltage detection terminal 110 to the main body 172 (in other words, the contact area between the two, or the area of ​​the area where the two are arranged close to each other even if they are not in contact) compared to when an edge of the voltage detection terminal 110 is simply adjacent to the main body 172 of the thermistor 170. This allows the thermistor 170 to accurately measure the temperature of the voltage detection terminal 110 (and thus the temperature of the power storage module 102 transmitted through the conductive plate 104 and the voltage detection terminal 110 in the stacked power storage device 101). In addition, the thermistor 170 is not only transferred with heat from the storage module 102 via the conductive plate 104 and the voltage detection terminal 110, but also with heat from the storage modules 102 arranged so as to sandwich the thermistor 170 in the vertical direction.

[0053] Next, the cover 130 is attached to the housing 140 by engaging it with the housing 140 at the temporary engagement position. To this end, the cover 130 is pushed rightward so that the opposing portions 131 of the cover 130 sandwich the upper and lower cover attachment recesses 141 of the housing 140 from above and below, so that the extending portions 132 of the cover 130 cover the upper cover attachment recesses 141 of the housing 140, and so that the pair of wire holding pieces 135 of the cover 130 cover the pair of wire holding piece recesses 152 of the housing 140 (see the white arrows in FIG. 9). As the cover 130 moves rightward relative to the housing 140, the locking portions 136 of the cover 130 slide on the bottom surfaces 141a of the cover attachment recesses 141. Thereafter, the locking portions 136 enter the interiors of the temporary engagement portions 154 (see FIG. 10) and engage with the temporary engagement portions 154. As a result, the cover 130 is locked to the housing 140 at the temporary locking position, completing the attachment of the cover 130 to the housing 140, and obtaining the voltage detection unit 105 (see FIG. 1). Note that, when the cover 130 is locked at the temporary locking position, the upper and lower right edges 130b (see FIGS. 4, 6, and 7) of the cover 130 do not abut against the upper and lower right inner walls 141b (see FIGS. 4 to 7) of the housing 140, and a gap exists in the left-right direction between the right edges 130b and the right inner walls 141b. As will be described later, the voltage detection unit 105 obtained after the attachment of the cover 130 to the housing 140 is completed (when the cover 130 is locked at the temporary locking position) is used to assemble the conductive module 103 (see FIG. 1).

[0054] When the cover 130 is locked in the temporary locking position, the opposing portion 131 of the cover 130 (more specifically, the right end portion 133a of the pair of upper and lower flat plate portions 133 (see FIGS. 4, 6, and 7)) does not cover the tip portion 112a of the voltage detection terminal 110. Therefore, the upper and lower surfaces of the tip portion 112a of the voltage detection terminal 110 are still exposed by the notch 143.

[0055] Furthermore, the pair of wire holding pieces 135 of the cover 130 are disposed over the opening of the wire accommodating recess 146. This prevents the wire 120 from slipping out of the wire accommodating recess 146. Furthermore, the extending ends of the pair of wire holding pieces 135 are received in the pair of storage holes 153. This prevents the pair of wire holding pieces 135 from shifting in position or from being unintentionally deformed such that the pair of wire holding pieces 135 are separated from the wire accommodating recess 146.

[0056] The procedure for moving the cover 130, which is locked in the temporary locking position, to the full locking position (see FIGS. 9 and 10), is described below. To move the cover 130, which is locked in the temporary locking position, to the full locking position, the cover 130, which is locked in the temporary locking position, is pushed rightward (see the white arrow in FIG. 9). As the cover 130 moves rightward relative to the housing 140, the extending ends of the pair of wire holding pieces 135 of the cover 130 further enter and are stored in the pair of storage holes 153, and the locking portions 136 of the cover 130 climb over the temporary locking portions 154 and slide on the bottom surface 141a of the cover mounting recess 141. Thereafter, the locking portions 136 enter the interior of the full locking portions 155 and engage with them, and the upper and lower right edge portions 130b of the cover 130 abut against the upper and lower right inner walls 141b of the housing 140, respectively. As a result, the cover 130 is locked to the housing 140 at the full locking position (see FIGS. 9 and 10).

[0057] When the cover 130 is locked in the full locking position, as shown in Fig. 9, the entire area of ​​the cover mounting recess 141 is completely covered by the cover 130, and the entire wire accommodating recess 146 is covered by the extension portion 132 of the cover 130. This prevents the wire 120 from slipping out of the wire accommodating recess 146. Furthermore, as shown in Fig. 10, the facing portion 131 of the cover 130 (more specifically, the right end portion 133a of the pair of upper and lower flat plate portions 133) covers the upper and lower surfaces of the tip portion 112a of the voltage detection terminal 110. As a result, the entire voltage detection terminal 110 is covered by the facing portion 131 of the cover 130, and the voltage detection terminal 110 can be reliably protected.

[0058] As described above, the voltage detection unit 105 obtained after the cover 130 has been attached to the housing 140 (with the cover 130 locked in the provisionally locked position) is used to assemble the conductive module 103 (see FIG. 1). Specifically, first, as shown in FIG. 2, the flange portion 104a of the conductive plate 104 is fitted into the recessed portion 105a of the voltage detection unit 105, thereby connecting the voltage detection unit 105 to the left side of the conductive plate 104.

[0059] In this state, as can be seen from Figure 3, a portion of the flange portion 104a of the conductive plate 104 is positioned so as to overlap the underside of the tip portion 112a of the voltage detection terminal 110, and due to the presence of the notch 143 in the housing 140, the upper surface of the tip portion 112a of the voltage detection terminal 110 is exposed upward, and the lower surface of a portion of the flange portion 104a of the conductive plate 104 is exposed downward.

[0060] Next, the upper surface of tip portion 112a of voltage detection terminal 110 exposed upward and the lower surface of part of flange portion 104a of conductive plate 104 exposed downward are used to fasten tip portion 112a of voltage detection terminal 110 to part of flange portion 104a of conductive plate 104 by ultrasonic bonding, welding, or other method. Thereafter, cover 130 is moved from the provisional locking position to the full locking position, completing the assembly of voltage detection unit 105 and conductive plate 104.

[0061] Next, the flange portion 104b of the conductive plate 104 is fitted into the recessed portion 106a of the opposing unit 106, thereby connecting the opposing unit 106 to the right side of the conductive plate 104 to which the voltage detection unit 105 is attached (see FIG. 2, etc.). This completes the assembly of the conductive module 103.

[0062] The conductive module 103 obtained in this manner is used to assemble the energy storage device 101 shown in Fig. 1. Specifically, the energy storage modules 102 and the conductive modules 103 are stacked alternately in the vertical direction, and the stack is fixed with predetermined metal fittings or the like to obtain the energy storage device 101.

[0063] <Actions and Effects> As described above, with the voltage detection unit 105 according to this embodiment and the power storage device 101 using the voltage detection unit 105, the voltage detection terminal 110, to which the electric wire 120 is connected at its tip 113a, can be accommodated in the terminal accommodating recess 142 of the housing 140, and the cover 130 can be engaged with the housing 140 with the tip 112a of the voltage detection terminal 110 exposed. Therefore, when electrically connecting the voltage detection unit 105 to the conductive plate 104 (the conductive plate 104 of the stacked power storage device 101), for example, the voltage detection unit 105 can be assembled to the conductive plate 104, and then the exposed tip 112a of the voltage detection terminal 110 can be fixed to the conductive plate 104 using a method such as ultrasonic bonding or welding. This eliminates the need for additional components for connection compared to typical bolt fastening, and also simplifies alignment between the two and reduces contact resistance at the contact points compared to the conventional connection method described above. Furthermore, after connecting the conductive plate 104 and the voltage detection terminal 110, by placing the cover 130 in the main locking position, the tip 112a of the voltage detection terminal 110 (i.e., the contact point between them) can be covered and protected by the cover 130.

[0064] Furthermore, when attaching the cover 130 to the housing 140, attaching the thermistor 170 to the housing 140 causes the thermistor 170 to engage with the voltage detection terminal 110, thereby restricting movement of the voltage detection terminal 110 housed in the terminal accommodating recess 142 in the plate thickness direction (upward). This prevents, for example, the voltage detection terminal 110 housed in the terminal accommodating recess 142 from unintentionally moving in the plate thickness direction (upward), which would prevent attachment of the cover 130 to the housing 140. Furthermore, if the voltage detection terminal 110 has moved in the plate thickness direction (upward) from its original housing position before the thermistor 170 is attached (for example, if the voltage detection terminal 110 is not properly housed in the terminal accommodating recess 142 and rides up on the periphery of the terminal accommodating recess 142), the voltage detection terminal 110 will prevent attachment of the thermistor 170 to the housing 140, making it possible to detect that the voltage detection terminal 110 is not properly housed in the terminal accommodating recess 142. Therefore, the voltage detection unit 105 and the power storage device 101 according to this embodiment have excellent workability in conductive connection with the conductive plate 104. Furthermore, the voltage detection unit 105 and the power storage device 101 according to this embodiment allow the voltage detection terminal 110 and the cover 130 to be easily and properly assembled to the housing 140.

[0065] Furthermore, in the voltage detection unit 105 according to this embodiment, the main body 172 of the thermistor 170 is adjacent to the second extending portion 114b of the voltage detection terminal 110, which extends in the plate thickness direction. This increases the area that contributes to heat transfer from the voltage detection terminal 110 to the main body 172 (in other words, the contact area between the two, or the area of ​​the area in which the two are arranged close to each other even if they are not in contact) compared to when an edge of the voltage detection terminal 110 is simply adjacent to the main body 172. This allows the thermistor 170 to accurately measure the temperature of the voltage detection terminal 110 (in other words, for example, in a stacked energy storage device 101, the temperature of the energy storage module 102 transferred through the conductive plate 104 and the voltage detection terminal 110).

[0066] Furthermore, in the voltage detection unit 105 according to this embodiment, the voltage detection terminal 110 has a shape that does not interfere with the housing 140 between an accommodation position where the voltage detection terminal 110 is accommodated in the terminal accommodating recess 142 and an external position where the voltage detection terminal 110 is assumed to have moved from that accommodation position in the plate thickness direction (upward) away from the housing 140. As a result, when accommodating the voltage detection terminal 110 in the terminal accommodating recess 142, the voltage detection terminal 110 can be accommodated in the terminal accommodating recess 142 simply by moving the voltage detection terminal 110 linearly in the plate thickness direction (downward) toward the terminal accommodating recess 142. Therefore, compared to a case where, for example, an operation of hooking the edge of the voltage detection terminal 110 into a locking hole in the housing 140 is required when accommodating the voltage detection terminal 110, the voltage detection terminal 110 can be easily accommodated in the terminal accommodating recess 142.

[0067] <Other forms> It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the above-described embodiments, and modifications, improvements, etc. are possible as appropriate. In addition, the material, shape, dimensions, number, location, etc. of each component in the above-described embodiments are arbitrary and not limited as long as the present invention can be achieved.

[0068] Here, the features of the above-described embodiments of the voltage detection unit 105 and the power storage device 101 will be briefly summarized and listed below in [1] to [4].

[0069] [1] a voltage detection terminal (110) having a first portion (112a) that is electrically connected to the detection target (104); a plate-shaped housing (140) having a terminal accommodating recess (142) in which the voltage detection terminal (110) is accommodated; a cover (130) that can be engaged with the housing (140) at a temporary engagement position that does not cover the first location (112a) of the voltage detection terminal (110) accommodated in the terminal accommodating recess (142) and at a full engagement position that covers the first location (112a); a temperature detector (170) that houses a temperature detector element (171) and is attached to the housing (140); an electric wire (120) electrically connected to the second portion (113a) of the voltage detection terminal (110) and drawn out toward the outside of the housing (140); A voltage detection unit (105) comprising: The temperature detector (170) The temperature detector (170) is arranged so that at least a portion thereof overlaps the voltage detection terminal (110) in the thickness direction of the housing (140) so as to restrict the voltage detection terminal (110) accommodated in the terminal accommodating recess (142) from moving in the thickness direction of the housing (140). A voltage detection unit (105).

[0070] According to the voltage detection unit having the configuration [1] above, the voltage detection terminal, to which the electric wire is connected at the second location, is accommodated in the terminal accommodation recess of the housing, and the cover can be engaged with the housing while the first location of the voltage detection terminal is exposed. Therefore, when electrically connecting the voltage detection unit to a detection target (e.g., a conductive plate used in a stacked-type power storage device), the voltage detection unit can be assembled to the detection target, and then the exposed first location of the voltage detection terminal can be fixed to the detection target using techniques such as ultrasonic bonding or welding. This eliminates the need for additional connection components compared to typical bolt fastening, and, compared to the conventional connection methods described above, facilitates alignment of the two and reduces contact resistance at the contact points. Furthermore, after connecting the detection target and the voltage detection terminal, placing the cover in the fully engaged position allows the first location of the voltage detection terminal (i.e., the contact point between the two) to be covered and protected by the cover.

[0071] Furthermore, by attaching a temperature detector (e.g., a thermistor) to the housing before attaching the cover to the housing, at least a portion of the temperature detector overlaps the voltage detection terminal in the plate thickness direction, thereby preventing the voltage detection terminal housed in the terminal accommodating recess from moving in the plate thickness direction (so-called voltage detection terminal riding up). At least a portion of the temperature detector may be in contact with the voltage detection terminal, or may be separated from the voltage detection terminal by a gap that is acceptable from the perspective of restricting the movement of the voltage detection terminal. This prevents, for example, the voltage detection terminal housed in the terminal accommodating recess from unintentionally moving in the plate thickness direction, which would interfere with the attachment of the cover to the housing. Furthermore, if the voltage detection terminal moves in the plate thickness direction from its intended location before the temperature detector is attached (for example, if the voltage detection terminal is not properly housed in the terminal accommodating recess and rides up around the periphery of the terminal accommodating recess), the voltage detection terminal will prevent the temperature detector from being attached to the housing, making it possible to detect that the voltage detection terminal is not properly housed in the terminal accommodating recess.

[0072] Therefore, the voltage detection unit of this configuration is excellent in workability for conductive connection with the detection target. Furthermore, the voltage detection unit of this configuration allows the voltage detection terminal and the cover to be easily and properly assembled to the housing.

[0073] [2] In the voltage detection unit (105) described in [1] above, The voltage detection terminal (110) a third portion (114b) extending in the thickness direction; The temperature detector (170) The third portion (114b) is disposed adjacent to the third portion (114b). A voltage detection unit (105).

[0074] According to the voltage detection unit having the configuration [2] above, the thermometer is adjacent to the third location of the voltage detection terminal extending in the plate thickness direction, and this increases the area contributing to heat transfer from the voltage detection terminal to the thermometer (in other words, the contact area between the two, or the area of ​​the area in which the two are arranged close to each other even if they are not in contact) compared to when the edge of the voltage detection terminal is simply adjacent to the thermometer. This allows the thermometer to accurately measure the temperature of the voltage detection terminal (in other words, for example, in a stacked-type energy storage device, the temperature of the energy storage module transmitted through the detection target such as a conductive plate and the voltage detection terminal).

[0075] [3] In the voltage detection unit (105) described in [1] above, The voltage detection terminal (110) The terminal accommodating recess (142) has a shape that does not interfere with the housing (140) between an accommodating position where the voltage detection terminal (110) is accommodated in the terminal accommodating recess (142) and an external position where the voltage detection terminal (110) is assumed to have moved from the accommodating position in the thickness direction away from the housing (140). A voltage detection unit (105).

[0076] According to the voltage detection unit having the configuration [3] above, the voltage detection terminal has a shape that does not interfere with the housing between the accommodation position in the terminal accommodating recess and the external position assumed to be obtained by moving the voltage detection terminal from the accommodation position in the thickness direction away from the housing. As a result, when attaching the voltage detection terminal, the voltage detection terminal can be accommodated in the terminal accommodating recess simply by moving the voltage detection terminal linearly in the thickness direction from the outside of the housing (i.e., from the external position). Therefore, compared to, for example, a case in which the voltage detection terminal needs to be accommodated by hooking the edge of the voltage detection terminal into a locking hole in the housing, the voltage detection terminal can be accommodated more easily in the terminal accommodating recess.

[0077] [4] a plate-shaped conductive module (103) including the voltage detection unit (105) according to any one of the above [1] to [3] and a conductive plate (104) as a detection target to which the voltage detection terminal (110) is electrically connected; a chargeable and dischargeable storage module (102) on which the conductive module (103) is stacked; The power storage device (101) includes:

[0078] According to the energy storage device having the configuration [4] above, the voltage detection terminal, to which the electric wire is connected at the second location, is accommodated in the terminal accommodation recess of the housing, and the cover can be engaged with the housing while the first location of the voltage detection terminal is exposed. Therefore, when electrically connecting the voltage detection unit to a detection target (e.g., a conductive plate used in a stacked energy storage device), the voltage detection unit can be assembled to the detection target, and then the exposed first location of the voltage detection terminal can be fixed to the detection target using techniques such as ultrasonic bonding or welding. This eliminates the need for additional connection components compared to typical bolt fastening, and facilitates alignment between the two and reduces contact resistance at the contact points compared to the conventional connection methods described above. Furthermore, after connecting the detection target and the voltage detection terminal, placing the cover in the fully engaged position allows the first location of the voltage detection terminal (i.e., the contact point between the two) to be covered and protected by the cover.

[0079] Furthermore, when attaching the cover to the housing, by attaching the temperature detector to the housing, at least a portion of the temperature detector overlaps the voltage detection terminal in the thickness direction, thereby restricting the voltage detection terminal housed in the terminal accommodating recess from moving in the thickness direction. At least a portion of the temperature detector may be in contact with the voltage detection terminal, or may be separated from the voltage detection terminal by a gap acceptable for the restriction. This prevents, for example, the voltage detection terminal housed in the terminal accommodating recess from unintentionally moving in the thickness direction, which would prevent the cover from being attached to the housing. Furthermore, if the voltage detection terminal moves in the thickness direction from its intended position before the temperature detector is attached (for example, if the voltage detection terminal is not properly housed in the terminal accommodating recess and rides up on the periphery of the terminal accommodating recess), the voltage detection terminal will prevent the temperature detector from being attached to the housing, making it possible to detect that the voltage detection terminal is not properly housed in the terminal accommodating recess.

[0080] Therefore, the power storage device of this configuration is excellent in workability for conductive connection with the detection object. Furthermore, the power storage device of this configuration allows the voltage detection terminal and the cover to be easily and properly assembled to the housing. [Explanation of symbols]

[0081] 101 Electricity storage device 102 Energy Storage Module 103 Conductive Module 104 Conductive plate (detection target) 105 Voltage detection unit 110 Voltage detection terminal 112a Tip (first location) 113a Tip (second location) 114b Second extension portion (third location) 120 Electric wire 130 Cover 140 Housing 142 Terminal receiving recess 170 Thermistor (thermometer) 171 Thermistor element (temperature measuring element)

Claims

1. a voltage detection terminal having a first portion to be conductively connected to a detection target; a plate-shaped housing having a terminal accommodating recess for accommodating the voltage detection terminal; a cover that can be engaged with the housing at a temporary engagement position that does not cover the first location of the voltage detection terminal accommodated in the terminal accommodating recess, and at a full engagement position that covers the first location; a temperature detector having a temperature measuring element housed therein and attached to the housing; an electric wire electrically connected to a second location of the voltage detection terminal and extending to the outside of the housing; A voltage detection unit comprising: The thermometer is The temperature detector is disposed so that at least a portion of the temperature detector overlaps with the voltage detection terminal in the thickness direction of the housing, so as to restrict the voltage detection terminal accommodated in the terminal accommodating recess from moving in the thickness direction of the housing. Voltage detection unit.

2. 2. The voltage detection unit according to claim 1, The voltage detection terminal is A third portion extending in the plate thickness direction, The thermometer is disposed adjacent to the third location; Voltage detection unit.

3. 2. The voltage detection unit according to claim 1, The voltage detection terminal is The voltage detection terminal has a shape that does not interfere with the housing between an accommodating position where the voltage detection terminal is accommodated in the terminal accommodating recess and an external position where the voltage detection terminal is assumed to have moved from the accommodating position in the direction of plate thickness away from the housing. Voltage detection unit.

4. a plate-shaped conductive module including the voltage detection unit according to any one of claims 1 to 3 and a conductive plate as a detection target to which the voltage detection terminal is electrically connected; a chargeable and dischargeable storage module in which the conductive modules are stacked; A power storage device comprising:

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