Voltage detection unit and power storage device

Abstract

A voltage detection unit includes: a voltage detection terminal having a first portion configured to be conductively connected to a detection object; a plate-shaped housing having a terminal accommodating recess for accommodating the voltage detection terminal; a cover configured to be locked to the housing at a temporary locking position where a first portion of the voltage detection terminal accommodated in the terminal accommodating recess is not covered and a final locking position where the first portion is covered; a temperature measurer which accommodates the thermometric element and is attached to the housing; and an electric wire conductively connected to the second portion of the voltage detection terminal and led out to the outside of the housing. The temperature measurer is arranged such that at least a portion of the temperature measurer overlaps the voltage detection terminal in a plate thickness direction of the housing.

Description

Technical Field

[0001] The present disclosure relates to a voltage detection unit configured such that a voltage detection terminal to be conductively connected to a detection object is accommodated in a plate-shaped housing, and a power storage device using the same. Background Art

[0002] A stacked power storage device is proposed in the prior art, in which a plurality of thin power storage modules capable of charge and discharge are connected in series via conductive plates by alternately arranging and repeatedly stacking plate-shaped power storage modules and conductive plates. The power storage module used in this type of power storage device generally has a structure in which a plurality of battery cells are built in, and functions as one battery capable of charge and discharge.

[0003] In a power storage device in the prior art, in order to monitor the output state of each power storage module (i.e., the potential of the output surface of each power storage module relative to the zero potential serving as a reference, hereinafter referred to as "the voltage of the power storage module"), a detection terminal such as a bus bar is connected to a conductive plate in contact with the output surface of the power storage module, and the voltage of the power storage module is measured through the detection terminal (for example, see patent document JP2020-161340A).

[0004] However, when actually connecting the busbar and the like to the conductive plate in the power storage device having the above-mentioned structure, since the power storage module and the conductive plate are in the shape of a thin plate, it is difficult to ensure space for installing other components for connection (for example, bolts for bolt fastening, etc.). Therefore, the power storage device of the above-mentioned prior art is provided with an insertion hole for inserting the detection terminal into the side edge of each conductive plate. The detection terminal is inserted into the insertion hole of the conductive plate from the side of the stacked body in which the power storage module and the conductive plate are stacked, so that the conductive plate is connected to the detection terminal. However, according to this connection method of the prior art, when inserting the detection terminal, the positioning between the insertion hole of the conductive plate and the detection terminal is complicated, making it difficult to improve the operability of the connection operation. Summary of the invention

[0005] An object of the present invention is to provide a voltage detection unit having excellent operability in conductive connection with a detection object, and a power storage device using the voltage detection unit.

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

[0007] According to one aspect of the present disclosure, a voltage detection unit is provided, comprising: a voltage detection terminal having a first portion configured to be conductively connected to a detection object; a plate-shaped housing having a terminal accommodating recess for accommodating the voltage detection terminal; a cover configured to be locked to the housing at a temporary locking position in which the first portion of the voltage detection terminal accommodated in the terminal accommodating recess is not covered and at a final locking position in which the first portion is covered; a temperature measurer accommodating a temperature measuring element and attached to the housing; and an electric wire conductively connected to a second portion of the voltage detection terminal and led out to the outside of the housing, wherein the temperature measurer is arranged so that at least a portion of the temperature measurer overlaps with the voltage detection terminal in a plate thickness direction of the housing to limit movement of the voltage detection terminal accommodated in the terminal accommodating recess in the plate thickness direction.

[0008] According to another aspect of the present disclosure, there is provided a power storage device, comprising: a plate-shaped conductive module, the conductive module comprising a voltage detection unit and a conductive plate, the conductive plate being a detection object to which a voltage detection terminal is conductively connected; and a power storage module, the power storage module being configured for charging and discharging, the conductive modules being stacked on the power storage module.

[0009] According to the voltage detection unit and the power storage device disclosed in the present invention, the cover can be locked to the housing in a state where the voltage detection terminal whose second part is connected to the electric wire is accommodated in the terminal accommodation recess of the housing and the first part of the voltage detection terminal is exposed. Therefore, when the voltage detection unit is electrically connected to the detection object (for example, a conductive plate used in a stacked power storage device, etc.), for example, after the voltage detection unit is assembled to the detection object, the exposed first part of the voltage detection terminal can be fixed to the detection object using a method such as ultrasonic bonding or welding. Compared with typical bolt fastening, etc., this does not require other components for connection, and compared with the above-mentioned prior art connection method, it is possible to easily align the two components and reduce the contact impedance at the contact point. By placing the cover in the final locking position after the detection object and the voltage detection terminal are connected, the first part of the voltage detection terminal (that is, the contact point therebetween) can be covered and protected by the cover.

[0010] Furthermore, as described above, by attaching the temperature measuring device (e.g., thermistor) to the housing before attaching the cover to the housing, at least a portion of the temperature measuring device overlaps with the voltage detection terminal in the plate thickness direction, which prevents the voltage detection terminal accommodated in the terminal accommodating recess from moving in the plate thickness direction (so-called riding of the voltage detection terminal). At least a portion of the temperature measuring device may be in contact with the voltage detection terminal, or may be separated from the voltage detection terminal by a gap that can be allowed from the angle of limiting the movement of the voltage detection terminal. Thus, for example, it is prevented that the voltage detection terminal accommodated in the terminal accommodating recess moves in the plate thickness direction unexpectedly and hinders the attachment of the cover to the housing. Furthermore, if the voltage detection terminal moves in the plate thickness direction from the original accommodating position before the temperature measuring device is attached (e.g., if the voltage detection terminal is not properly accommodated in the terminal accommodating recess and rides on the periphery of the terminal accommodating recess), the voltage detection terminal hinders the attachment of the temperature measuring device to the housing, thereby enabling detection that the voltage detection terminal is not properly accommodated in the terminal accommodating recess.

[0011] Therefore, the voltage detection unit and the power storage device according to the present disclosure are excellent in operability of conductive connection with the detection object. In addition, the voltage detection unit and the power storage device of the present configuration can easily and appropriately assemble the voltage detection terminal and the cover to the housing.

[0012] The present disclosure has been briefly described above. In addition, the details of the present disclosure can be clarified by reading the following described mode for implementing the present disclosure (hereinafter referred to as "embodiment") with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present disclosure will be more fully understood from the detailed description given hereinafter and the accompanying drawings which are given by way of illustration only and therefore are not intended to limit the present disclosure, and in which:

[0014] Figure 1 is a partially exploded perspective view showing a stacked power storage device including a voltage detection unit according to the present embodiment;

[0015] Figure 2 is along Figure 1 A cross-sectional view taken along line AA;

[0016] Figure 3 yes Figure 2 A magnified view of part B;

[0017] Figure 4 yes Figure 1 An exploded perspective view of the voltage detection unit shown;

[0018] Figure 5 is a perspective view showing the operation when the voltage detection terminal is accommodated in the housing;

[0019] Figure 6 is a top view showing a thermistor, a cover, and a housing accommodating voltage detection terminals and wires;

[0020] Figure 7 is shown when the thermistor is connected to Figure 6 A top view of the housing when in operation is shown;

[0021] Figure 8 is along Figure 7 Sectional view taken along midline CC;

[0022] Fig. 9 The cover is shown attached to Figure 7 A top view of the housing when in operation; and

[0023] Fig.10 is along Fig. 9 A cross-sectional view taken along line DD in FIG. DETAILED DESCRIPTION

[0024] <Example>

[0025] Hereinafter, the voltage detection unit 105 and the power storage device 101 according to the present embodiment will be described with reference to the drawings. Hereinafter, for convenience of description, “front”, “rear”, “up”, “down”, “left”, “right”, “front-rear direction”, “left-right direction” and “up-down direction” are referred to as “front-rear direction”. Figure 1 The "front-rear direction", "left-right direction" and "up-down direction" are orthogonal to each other.

[0026] The voltage detection unit 105 is generally used to Figure 1 In the stacked power storage device 101 shown in . The power storage device 101 is composed of rectangular thin plate-shaped power storage modules 102 capable of charge and discharge and rectangular thin plate-shaped conductive modules 103 capable of electrically connecting adjacent power storage modules 102 alternately stacked in the up and down directions. In the power storage device 101, a plurality of power storage modules 102 are electrically connected in series via the conductive modules 103. Each power storage module 102 has a structure in which a plurality of battery cells (not shown) are built in, and the power storage module 102 as a whole functions as one battery capable of charge and discharge.

[0027] like Figure 1 As shown, each conductive module 103 is formed as a rectangular thin plate by a rectangular thin plate-shaped conductive plate 104 (the conductive plate 104 also serves as a heat sink as described below), 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. Figures 1 to 3 As shown (specifically, see Figure 2), the conductive plate 104 and the voltage detection unit 105 are connected to each other by fitting the flange 104a into the recess 105a. The flange 104a is provided on the left end surface of the conductive plate 104 and extends in the front-to-back direction. The recess 105a is provided on the right end surface of the voltage detection unit 105 and extends in the front-to-back direction. The conductive plate 104 and the opposing unit 106 are connected to each other by fitting the flange 104b into the recess 106a. The flange 104b is provided on the right end surface of the conductive plate 104 and extends in the front-to-back direction. The recess 106a is provided on the left end surface of the opposing unit 106 and extends in the front-to-back direction.

[0028] In each conductive module 103 located between the power storage modules 102 adjacent to each other in the vertical direction, the conductive plate 104 is in direct contact with the upper and lower power storage modules 102. Figure 2 Therefore, the conductive plate 104 is used to conduct electricity between the lower surface of the upper power storage module 102 and the upper surface of the lower power storage module 102, and serves as a heat sink that releases heat generated from the upper and lower power storage modules 102 to the outside.

[0029] In each conductive module 103 located between the power storage modules 102 adjacent to each other in the up-down direction, the voltage detection unit 105 includes a voltage detection terminal 110 (see Figure 2 The voltage detection unit 105 has the following functions: via the wire 120 (see Figure 1 The voltage detection unit 105 is provided at Figures 1 to 3 105, but a voltage detection unit having the same function as that of the voltage detection unit 105 may be provided on the right side of the conductive plate 104. In this case, a voltage detection unit obtained by inverting the entire configuration of the voltage detection unit 105 in the left-right direction (i.e., a mirror image component of the voltage detection unit 105) is used as a voltage detection unit having the same function as that of the voltage detection unit 105.

[0030] For each conductive module 103 positioned between the power storage modules 102 adjacent to each other in the up-down direction, as the opposing unit 106 , any one of a voltage detection unit, a dummy unit, and a temperature detection unit described later is applied according to the specification of the power storage device 101 .

[0031] If the opposing unit 106 is a voltage detection unit, such a voltage detection unit (i.e., a mirror component of the above-mentioned voltage detection unit 105) obtained by inverting the overall configuration of the voltage detection unit 105 in the left-right direction is used as the opposing unit 106. In this case, the voltage detection unit 105 is placed on the left side of the conductive plate 104, and the mirror component of the voltage detection unit 105 is placed on the right side of the conductive plate 104. The opposing unit 106 (the mirror component of the voltage detection unit 105) has the same function as the voltage detection unit 105.

[0032] If the facing unit 106 is a dummy unit, it will have a recess 106a extending in the front-to-back direction (see FIG. Figure 2 ) is used as the facing unit 106. In this case, the facing unit 106 performs only the function of filling the gap between the upper and lower power storage modules 102.

[0033] If the facing unit 106 is a temperature detection unit, the facing unit 106 has a structure in which a temperature sensor (not shown) is built in a resin plate serving as a dummy unit. In this case, the facing unit 106 has a wire 107 (see FIG. 1 ) connected to the temperature sensor. Figure 1 ) is a function of outputting a signal indicating the temperature of the upper and lower power storage modules 102.

[0034] In the following, reference will be made to Figures 4 to 10 The specific configuration of the voltage detection unit 105 according to this embodiment is described. Figure 4 As shown, the voltage detection unit 105 includes a housing 140, a voltage detection terminal 110 accommodated in the housing 140, an electric wire 120 connected to the voltage detection terminal 110 and accommodated in the housing 140, a cover 130 mounted on the housing 140, and a thermistor 170 mounted on the housing 140. The thermistor 170 corresponds to a "temperature measurer" in the present disclosure.

[0035] The voltage detection terminal 110 is received in a terminal receiving recess 142 (see FIG. Figure 4 ) which will be described later. The electric wire 120 is accommodated in the electric wire accommodation recess 146 (see Figure 4 ), which will be described later. The cover 130 is mounted in a cover mounting recess 141 (see Figure 4 ), which will be described later. The thermistor 170 is mounted in the thermistor mounting recess 161 (see Figure 4 ), which will be described later. Hereinafter, components constituting the voltage detection unit 105 will be described in sequence.

[0036] First, the voltage detection terminal 110 will be described. The voltage detection terminal 110 made of metal is formed by applying a process such as a punching process to a metal plate. The voltage detection terminal 110 is accommodated in the terminal accommodation recess 142 of the housing 140 from above. Figure 4 and Figure 5 As shown, the voltage detection terminal 110 includes a rectangular flat plate-shaped first portion 111 extending in the front-to-back direction, a rectangular flat plate-shaped second portion 112 extending to the right from the rear end portion of the first portion 111, and a rectangular flat plate-shaped third portion 113 extending to the left from the front end portion of the first portion 111, and has a roughly crank-shaped flat plate shape as a whole when viewed in the up and down directions.

[0037] One end of the wire 120 is fixed and electrically connected to the terminal portion 113a (i.e., the end closer to the left end) of the third portion 113. The other end of the wire 120 is to be connected to a voltage measuring device (not shown) outside the power storage device 101. A portion of the flange 104a of the conductive plate 104 is fixed to the lower surface of the terminal portion 112a (i.e., the end closer to the right end) of the second portion 112 by a method such as ultrasonic bonding or welding (see FIG. 1 ). Figure 3 ).

[0038] The voltage detection terminal 110 is provided with an extension portion 114 extending further backward from the rear end portion of the first portion 111. Specifically, the extension portion 114 includes a first extension portion 114a extending further backward from the rear end portion of the first portion 111 and a second extension portion 114b extending downward from the extension end portion of the first extension portion 114a (along the plate thickness direction of the voltage detection terminal 110). The downward extension length of the second extension portion 114b is greater than the plate 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 the accommodation recess 162 (see Figure 4 and Figure 8 The effect of providing the extension portion 114 in the voltage detection terminal 110 will be described later.

[0039] Next, the cover 130 will be described. The cover 130 is a resin molded part and is mounted to the cover mounting recess 141 of the housing 140 from the left side. Figure 4 As shown, the cover 130 includes a facing portion 131 and an extending portion 132 extending forward from the facing portion 131. The facing portion 131 is mainly used to cover and protect the voltage detection terminal 110, and the extending portion 132 is mainly used to cover and protect the wire 120.

[0040] The facing portion 131 includes a pair of flat plates 133 facing each other at a certain interval in the up-down direction, and a connecting portion 134, and the connecting portion 134 connects the left end edges of the pair of flat plates 133 extending in the front-back direction to each other in the up-down direction over the entire area in the front-back direction. The facing portion 131 has a substantially U-shaped opening when viewed in the front-back direction. The right end edge of each flat plate 133 has a stepped shape that is inclined in a direction that moves more toward the left as it moves toward the front. The extension portion 132 extends forward from the front end edge of the upper flat plate 133 of the pair of flat plates 133 constituting the facing portion 131 in a flush and continuous manner, and has a substantially rectangular flat plate shape.

[0041] The extension portion 132 is integrally formed with two wire holding pieces 135 extending in the left-right direction, and the two wire holding pieces 135 are arranged at intervals in the front-rear direction. Each wire holding piece 135 protrudes downward from the lower surface of the extension portion 132 and extends in the left-right direction to further protrude rightward from the right end edge of the extension portion 132. When the cover 130 is mounted on the housing 140, the wire holding piece 135 holds the wires 120 accommodated in the housing 140.

[0042] The lower plate 133 of the pair of plates 133 constituting the facing portion 131 is formed with a locking portion 136 which protrudes upward toward the upper plate 133 at a predetermined position (see FIG. Fig.10 The locking portion 136 is used to cooperate with the temporary locking portion 154 and the final locking portion 155 (which are provided in the housing 140 and will be described later) to lock the cover 130 to a temporary locking position (not shown) and a final locking position (see Fig. 9 and 10 A rear side wall of the cover 130 (ie, a side wall connecting the rear end edges of the pair of flat plates 133 extending in the left-right direction to each other in the up-down direction) is provided with a protrusion 137 protruding rearward.

[0043] Next, the housing 140 will be described. The housing 140 is a resin molded part, and has Figure 1 The housing 140 has a substantially rectangular thin plate shape extending in the front-to-rear direction as shown in FIG. The right end surface of the housing 140 is formed with a recess 105a that is recessed to the left and extends in the front-to-rear direction. The flange 104a of the conductive plate 104 is to be fitted into the recess 105a (see FIG. Figure 2 ).

[0044] The positions where the cover 130 is installed on the upper surface and the lower surface of the housing 140 are respectively formed with a cover installation recess 141, which is recessed into a shape corresponding to the overall shape of the cover 130 (see FIG. Figures 4 to 6). The recess depth (depth in the up-down direction) of the cover mounting recess 141 is equal to the plate thickness of the resin material constituting the cover 130 (opposing portion 131 + extending portion 132). Therefore, when the cover 130 is mounted on the housing 140, the surface of the housing 140 is flush with the surface of the cover 130 (see FIG. Figure 1 and 9 ).

[0045] A terminal accommodating recess 142 is formed on the bottom surface 141a of the upper cover mounting recess 141 of the housing 140 at a position for accommodating the voltage detection terminal 110. The terminal accommodating recess 142 is further recessed into a shape corresponding to the overall shape of the voltage detection terminal 110 (see FIG. Figure 4 and Figure 5 ). The recess depth (depth in the up-down 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 to the housing 140, the upper surface of the voltage detection terminal 110 is flush with the bottom surface 141a of the cover mounting recess 141.

[0046] A notch 143 is formed at a position for placing the terminal portion 112a of the voltage detection terminal 110 in the front-to-back direction of the right end edge of the housing 140, and when viewed from the top-to-bottom direction, the notch 143 is recessed to the left into a substantially rectangular shape. The recess 105a extending in the front-to-back direction on the right end surface of the housing 140 is divided by the notch 143. When the voltage detection terminal 110 is accommodated in the housing 140, the upper surface and the lower surface of the terminal portion 112a of the voltage detection terminal 110 will be exposed through the notch 143.

[0047] A through hole 144 (see FIG. 144 ) extending in the front-rear direction and penetrating in the up-down direction is formed in the terminal receiving recess 142 at a position for placing the tip end portion 113a of the voltage detection terminal 110. Figure 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 Figure 6 and 7 ). In other words, the through hole 144 serves as a gap to avoid interference between the bottom surface 142 a of the terminal receiving recess 142 and the one end portion of the electric wire 120 .

[0048] A wire accommodating recess 146 is formed on the bottom surface 141a of the upper cover mounting recess 141 of the housing 140 at a position for accommodating the wire 120. The wire accommodating recess 146 has a shape corresponding to the wiring form of the wire 120 when accommodating the wire 120 (see Figure 4 and 5In the present embodiment, the wire accommodating recess 146 is a groove extending straightly in the front-rear direction. The rear end of the wire accommodating recess 146 is connected to the terminal accommodating recess 142, and the front end of the wire accommodating recess 146 constitutes a wire outlet 149, through which the wire 120 extends from the front end edge of the housing 140.

[0049] Two positions spaced apart in the front-to-back direction in the wire accommodating recess 146 are respectively provided with narrow recesses 151, which are recesses having a width (spaced apart in the left-right direction) narrower than other parts of the wire accommodating recess 146. The width of the narrow recess 151 is slightly smaller than the outer diameter of the wire 120. Therefore, the wire 120 is clamped while being pressed in the left-right direction. By clamping the wire 120 between a pair of narrow recesses 151, even if an unexpected external force is applied to the wire 120 led out of the housing 140, the external force can be resisted by the friction between the narrow recess 151 and the wire 120. Therefore, it is difficult for a large external force to be applied to the contact point between the voltage detection terminal 110 and the wire 120.

[0050] like Figure 4 and Figure 5 As shown, a pair of wire retaining pieces 135 for placing the cover 130 are formed with wire retaining piece recesses 152 on the bottom surface 141a of the upper cover mounting recess 141 of the shell 140, and the pair of wire retaining piece recesses 152 extend in the left and right directions at intervals in the front-to-back direction to correspond to the pair of wire retaining pieces 135.

[0051] The wire holding piece recess 152 extends from the left end edge of the upper surface of the housing 140 in the left-right direction, crosses the wire accommodating recess 146 to the right inner wall 141b (see FIG. 141 ) defining the right end of the upper cover mounting recess 141. Figure 4 and 5 A storage hole 153 is formed on the right inner wall 141b of the upper cover mounting recess 141 at each position for connecting with a pair of wire holding piece recesses 152 (see Figure 4 and 5 When the cover 130 is mounted on the housing 140 , the extended ends (ie, the right ends) of the pair of wire holding pieces 135 of the cover 130 are inserted into and stored in the pair of storage holes 153 .

[0052] like Fig.10 As shown, the bottom surface 141a of the lower cover mounting recess 141 of the housing 140 is formed with a temporary locking portion 154 and a final locking portion 155, which are recesses that are recessed upward. The temporary locking portion 154 and the final locking portion 155 are respectively provided when the locking portion 136 of the cover 130 is in the temporary locking position (not shown) and the final locking position (see FIG. Fig. 9 and 10Specifically, the temporary locking portion 154 and the final locking portion 155 are arranged in the left-right direction so that the final locking portion 155 is located on the right side of the temporary locking portion 154.

[0053] At the left end edge of the housing 140 extending in the front-to-rear direction, a thermistor mounting recess 161 is formed at a position where the thermistor 170 is mounted (i.e., a position adjacent to the rear side of the upper and lower cover mounting recess 141). The thermistor mounting recess 161 has a shape corresponding to the overall shape of the thermistor 170 (a main body 172 to be described later), and when viewed from the top-to-bottom direction, the thermistor mounting recess 161 is recessed rightward in a substantially rectangular shape (see FIG. 14A ). Figures 4 to 6 ).

[0054] The thermistor 170 is a component for measuring the temperature of the voltage detection terminal 110, and is mounted to the thermistor mounting recess 161 of the housing 140 from the left side. Figure 8 As shown in FIG. 1 , the thermistor 170 includes a thermistor element 171 constituting a temperature measuring element and a resin body 172 in which the thermistor element 171 is accommodated. The body 172 has a substantially rectangular parallelepiped shape extending in the left-right direction and has an internal space 172a (see FIG. 1 ) for accommodating the thermistor element 171. Figure 8 The gap between the thermistor element 171 accommodated in the internal space 172a and the inner wall surface defining the internal space 172a is filled with a sealing material 173 (see Figure 8 ). The thickness (length in the vertical direction) of the main body 172 is equal to the depth (length in the vertical direction) of the thermistor mounting recess 161 (= the plate thickness of the resin material constituting the housing 140). Therefore, when the thermistor 170 is mounted on the housing 140, the surface of the housing 140 is flush with the surface of the main body 172 (see Figures 7 to 9 ).

[0055] Inside the body 172, the thermistor element 171 is fixed and electrically connected to one end of the wire 180. The wire 180 connected to the thermistor element 171 extends backward from the left end of the body 172 toward the outside of the body 172 (see FIG. Figure 4 and 6 The other end of the electric wire 180 is to be connected to a temperature measuring device (not shown) outside the power storage device 101 .

[0056] The upper right end portion of the substantially rectangular parallelepiped main body 172 extending in the left-right direction is integrally provided with a protruding plate 174 protruding forward and extending in the left-right direction (see FIG. Figure 4 and Figures 6 to 9When the thermistor 170 is mounted on the housing 140, the protruding plate 174 engages with the extension portion 114 (more specifically, the first extension portion 114a) of the voltage detection terminal 110 accommodated in the terminal accommodation recess 142 (see Figure 8 The front and rear outer surfaces of the main body 172 are both provided with locking portions 175 (see Figure 4 and Figure 6 ). When the thermistor 170 is mounted on the housing 140, the locking portion 175 is locked to the locked portion 163 provided in the thermistor mounting recess 161, which will be described later. In this example, the locking portion 175 is configured to have a cavity provided in a groove extending in the left-right direction, and the groove is provided in the front side wall and the rear side wall of the main body 172. The front side wall of the main body 172 is provided with a notch-shaped cavity 176 extending in the left-right direction. When the cover 130 and the thermistor 170 are mounted on the housing 140, the protrusion 137 of the cover 130 fits into the cavity 176.

[0057] The upper part of the front inner wall of the bottom (right end) of the thermistor mounting recess 161 is connected to the rear end of the terminal accommodating recess 142. The upper part of the front inner wall is formed with an accommodating recess 162. The accommodating recess 162 is a groove that is adjacent to the rear side of the rear end edge of the bottom surface 142a of the terminal accommodating recess 142 and is recessed downward from the bottom surface 142a. The front inner surface and the rear inner surface of the thermistor mounting recess 161 are both provided with a locked portion 163. In this example, the locked portions 163 each include a cantilever locking piece and a locking ridge, which extends in the left-right direction in a manner adjacent to and along the front inner surface of the thermistor mounting recess 161, and the locking ridge is provided on the rear inner surface of the thermistor mounting recess 161 and extends in the left-right direction. A recess 164 (see FIG. 164 ) is formed in the left end surface of the substantially rectangular thin plate-shaped housing 140 extending in the front-to-back direction and is recessed in the right direction and extending in the front-to-back direction in the entire area in the front-to-back direction behind the thermistor mounting recess 161. Figure 4 and 5 ). The recess 164 is used to accommodate the wire 180 extending from the thermistor 170 (see Figure 7 and 9 ). The components constituting the voltage detection unit 105 have been described above.

[0058] Next, a process for assembling the voltage detection terminal 110, the thermistor 170, and the cover 130 to the housing 140 will be described. First, the voltage detection terminal 110 connected to the electric wire 120 in advance is accommodated in the terminal accommodation recess 142 of the housing 140. Thus, the voltage detection terminal 110 is fitted into the terminal accommodation 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 FIG. 14). Figure 5Here, the voltage detection terminal 110 has a storage position ( Figure 6 The voltage detection terminal 110 shown in FIG. 1 is located at an outer position ( 110 ) which is assumed to be moved away from the housing 140 in the plate thickness direction (vertical direction) from the accommodation position. Figure 5 The shape of the voltage detection terminal 110 shown in the figure does not interfere with the housing 140 (the terminal accommodating recess 142). Therefore, when the voltage detection terminal 110 is accommodated 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 toward the terminal accommodating recess 142 (in the plate thickness direction) while keeping the voltage detection terminal 110 horizontal (in an orientation perpendicular to the up and down direction).

[0059] In a state where the voltage detection terminal 110 is completely accommodated in the housing 140, the upper and lower surfaces of the distal end portion 112a of the voltage detection terminal 110 are exposed through the notch 143 (see FIG. 144). Figure 6 and 7 ). In addition, the second extension portion 114b of the extension portion 114 is accommodated in the accommodating recess 162 of the thermistor mounting recess 161, so that the first extension portion 114a of the extension portion 114 of the voltage detection terminal 110 closes the upper opening of the accommodating recess 162 (see Figure 8 ).

[0060] Next, the electric wire 120 extending from the voltage detection terminal 110 accommodated in the housing 140 is accommodated in the electric wire accommodation recess 146 of the housing 140. Therefore, the electric wire 120 is fitted along the electric wire accommodation recess 146 from above. At this time, a pair of portions of the electric wire 120 located at the upper portion of the pair of narrow recesses 151 are pushed downward so that the pair of portions of the electric wire 120 are accommodated in the pair of narrow recesses 151. In a state where the electric wire 120 is completely accommodated in the housing 140, the electric wire 120 extends forward from the electric wire outlet 149 to the outside of the housing 140.

[0061] Next, the thermistor 170 is mounted on the housing 140. Therefore, the main body 172 of the thermistor 170 is fitted into the thermistor mounting recess 161 of the housing 140 from the left side so that the locking portion 175 of the main body 172 is locked to the locked portion 163 of the thermistor mounting recess 161 (see FIG. Figure 7 The electric wire 180 extending backward from the left end of the main body 172 is accommodated in a recess 164 extending in the front-rear direction provided on the left end surface of the housing 140 (see Figure 4 and 5 ) and extends to the outside of the housing 140 through the rear end opening of the recess 164 (see Figure 1 ).

[0062] When the thermistor 170 is completely installed in the thermistor installation recess 161, Figure 8 As shown, the protruding plate 174 provided on the main body 172 of the thermistor 170 is engaged with the first extension 114a to overlap with the upper side of the first extension 114a of the extension 114 of the voltage detection terminal 110. Therefore, the voltage detection terminal 110 accommodated in the terminal accommodating recess 142 is restricted from moving upward (in the plate thickness direction). Therefore, for example, it is avoided that the voltage detection terminal 110 accommodated in the terminal accommodating recess 142 accidentally moves upward (in the plate thickness direction) and hinders the attachment of the cover 130 to the housing 140. Furthermore, if the voltage detection terminal 110 moves upward (in the plate thickness direction) from the 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 accommodation recess 142 and rides on the peripheral edge of the terminal accommodation recess 142), the protruding plate 174 interferes with the first extension portion 114a of the extension portion 114, and the attachment of the thermistor 170 to the housing 140 is hindered by the voltage detection terminal 110, so that it can be detected that the voltage detection terminal 110 is not properly accommodated in the terminal accommodation recess 142. In this example, the protruding plate 174 of the thermistor 170 contacts the first extension portion 114a of the voltage detection terminal 110, but the protruding plate 174 and the first extension portion 114a may be separated from each other, separated by a gap that can be allowed from the above-mentioned restricted angle.

[0063] In addition, when the thermistor 170 is completely installed in the thermistor installation recess 161, the second extension portion 114b of the extension portion 114 of the voltage detection terminal 110 is aligned with the right side of the main body 172 of the thermistor 170 (see FIG. Figure 8). The second extension portion 114b of the voltage detection terminal 110 and the main body 172 of the thermistor 170 may be in contact with each other, or may be separated from each other, separated by a gap that can be allowed from the perspective of improving thermal conductivity described later. As a result, the heat of the second extension portion 114b (i.e., the voltage detection terminal 110) is sequentially conducted to the thermistor element 171 accommodated in the main body 172 via the main body 172 and the sealing material 173 filled in the internal space 172a of the main body 172. Thus, the thermistor 170 is able to measure the temperature of the voltage detection terminal 110. Here, the main body 172 of the thermistor 170 is adjacent to the second extension portion 114b extending downward (in the plate thickness direction of the voltage detection terminal 110) included in the voltage detection terminal 110. This increases the size of the range that contributes to heat conduction from the voltage detection terminal 110 to the main body 172 (in other words, the contact area between them, or the area of ​​the range in which they are adjacent even if they are not in contact with each other) compared to the case where only the edge of the voltage detection terminal 110 is adjacent to the main body 172 of the thermistor 170. Therefore, the thermistor 170 can accurately measure the temperature of the voltage detection terminal 110 (and therefore the temperature of the storage module 102 conducted through the conductive plate 104 and the voltage detection terminal 110 in the stacked storage device 101). The heat conducted to the thermistor 170 includes not only the heat conducted from the storage module 102 via the conductive plate 104 and the voltage detection terminal 110, but also the heat conducted from the storage module 102 that sandwiches the thermistor 170 in the upper and lower directions.

[0064] Next, the cover 130 is mounted on the housing 140 by being locked to the housing 140 at the first temporary locking position. To this end, the cover 130 is pushed rightward so that the facing portion 131 of the cover 130 clamps the upper cover mounting recess 141 and the lower cover mounting recess 141 of the housing 140 in the up-down direction, the extending portion 132 of the cover 130 covers the upper cover mounting recess 141 of the housing 140, and the pair of wire holding pieces 135 of the cover 130 covers the pair of wire holding piece recesses 152 of the housing 140 (see FIG. Fig. 9 During the rightward movement of the cover 130 relative to the housing 140, the locking portion 136 of the cover 130 slides on the bottom surface 141a of the cover mounting recess 141. Thereafter, the locking portion 136 enters the temporary locking portion 154 (see FIG. Fig.10 ) and engage with the temporary locking portion 154. Therefore, the cover 130 is locked to the housing 140 at the temporary locking position, and the cover 130 is completely installed in the housing 140 to obtain the voltage detection unit 105 (see Figure 1 ). In a state where the cover 130 is locked at the temporary locking position, the upper right edge 130b and the lower right edge 130b of the cover 130 (see Figure 4 , Figure 6 and Figure 7) does not overlap with the upper right inner wall 141b and the lower right inner wall 141b of the housing 140 (see Figures 4 to 7 ) and there is a gap between the right end edge 130b and the right inner wall 141b in the left-right direction. As described later, after the cover 130 is completely mounted on the housing 140 (in a state where the cover 130 is locked at the temporary locking position), the voltage detection unit 105 obtained is used to assemble the conductive module 103 (see Figure 1 ).

[0065] In a state where the cover 130 is locked at the temporary locking position, the facing portion 131 of the cover 130 (more specifically, the right end portions 133a of the pair of upper and lower flat plates 133 (see FIG. Figure 4 , Figure 6 and Figure 7 The notch 143 does not cover the end portion 112 a of the voltage detection terminal 110 . Therefore, the upper and lower surfaces of the end portion 112 a of the voltage detection terminal 110 are also exposed through the notch 143 .

[0066] In addition, the pair of wire holding pieces 135 of the cover 130 are arranged above the opening of the wire accommodating recess 146. This prevents the wires 120 from coming out of the wire accommodating recess 146. Further, the extended ends of the pair of wire holding pieces 135 are received in the pair of storage holes 153. Therefore, it is possible to prevent accidental deformation such as displacement of the pair of wire holding pieces 135 or separation of the pair of wire holding pieces 135 from the wire accommodating recess 146.

[0067] Hereinafter, a method for moving the cover 130 locked at the temporary locking position to the final locking position (see FIG. Fig. 9 and 10 ) process. In order to move the cover 130 locked at the temporary locking position to the final locking position, push the cover 130 locked at the temporary locking position to the right (see Fig. 9 ). During the process of the cover 130 moving to the right relative to the housing 140, the extended ends of the pair of wire retaining pieces 135 of the cover 130 further enter and are stored in the pair of storage holes 153. At the same time, the locking portion 136 of the cover 130 passes over the temporary locking portion 154 and slides on the bottom surface 141a of the cover mounting recess 141. Thereafter, the locking portion 136 enters the interior of the final locking portion 155 and engages with the final locking portion 155, and the upper right end edge 130b and the lower right end edge 130b of the cover 130 respectively contact the upper right inner wall 141b and the lower right inner wall 141b of the housing 140. Therefore, the cover 130 is locked to the housing 140 at the final locking position (see Fig. 9 and 10 ).

[0068] In a state where the cover 130 is locked at the final locking position, as shown in FIG. Fig. 9As shown, the entire cover mounting recess 141 is covered by the cover 130 without a gap, and thus the entire wire accommodating recess 146 is covered by the extension 132 of the cover 130. This prevents the wire 120 from coming out of the wire accommodating recess 146. Fig.10 As shown, the facing portion 131 of the cover 130 (more specifically, the right end portion 133a of a pair of upper and lower flat plates 133) covers the upper and lower surfaces of the terminal portion 112a of the voltage detection terminal 110. Therefore, the entire voltage detection terminal 110 is covered by the facing portion 131 of the cover 130, so that the voltage detection terminal 110 can be reliably protected.

[0069] As described above, the voltage detection unit 105 obtained after the cover 130 is completely mounted on the housing 140 (in a state where the cover 130 is locked at the temporary locking position) is used to assemble the conductive module 103 (see FIG. Figure 1 ). Specifically, first, Figure 2 As shown, the flange 104 a of the conductive plate 104 is fitted into the recess 105 a of the voltage detection unit 105 , so that the voltage detection unit 105 is coupled to the left side of the conductive plate 104 .

[0070] In this state, if Figure 3 It can be understood that due to the presence of the recess 143 of the shell 140, a portion of the flange 104a of the conductive plate 104 overlaps with the lower side of the end portion 112a of the voltage detection terminal 110, and the upper surface of the end portion 112a of the voltage detection terminal 110 is exposed upward, and the lower surface of a portion of the flange 104a of the conductive plate 104 is exposed downward.

[0071] Next, the upper surface of the terminal portion 112a of the voltage detection terminal 110 exposed upward and the lower surface of a portion of the flange 104a of the conductive plate 104 exposed downward are used to fix the terminal portion 112a of the voltage detection terminal 110 and the portion of the flange 104a of the conductive plate 104 by a method such as ultrasonic bonding or welding. Thereafter, the cover 130 is moved from the temporary locking position to the final locking position, and the voltage detection unit 105 is completely assembled to the conductive plate 104.

[0072] Next, the flange 104b of the conductive plate 104 is fitted into the recess 106a of the opposing unit 106 so that the opposing unit 106 is connected to the right side of the conductive plate 104 assembled with the voltage detection unit 105 (see FIG. Figure 2 etc.). Thus, the conductive module 103 is completely assembled.

[0073] The conductive module 103 thus obtained is used to assemble Figure 1Specifically, the power storage device 101 is obtained by alternately stacking the power storage modules 102 and the conductive modules 103 in the vertical direction and fixing the stacked body by a predetermined metal fitting or the like.

[0074] <Operations and Effects>

[0075] As described above, according to the voltage detection unit 105 of the present embodiment and the power storage device 101 using the voltage detection unit 105, the cover 130 can be locked to the housing 140 in a state where the voltage detection terminal 110 whose terminal portion 113a is connected to the electric wire 120 is accommodated in the terminal accommodation recess 142 of the housing 140 and the terminal portion 112a of the voltage detection terminal 110 is exposed. Therefore, when the voltage detection unit 105 is electrically connected to the conductive plate 104 (the conductive plate 104 of the stacked power storage device 101), for example, after assembling the voltage detection unit 105 to the conductive plate 104, the exposed terminal portion 112a of the voltage detection terminal 110 can be fixed to the conductive plate 104 using a method such as ultrasonic bonding or welding. Compared with typical bolt fastening or the like, this does not require additional components for connection, and compared with the above-mentioned prior art connection method, it is possible to easily align the two components and reduce the contact resistance at the contact point. Furthermore, by placing the cover 130 at the final locking position after connection between the conductive plate 104 and the voltage detection terminal 110 , the tip portions 112 a of the voltage detection terminal 110 (ie, the contact points therebetween) can be covered and protected by the cover 130 .

[0076] Furthermore, when the cover 130 is attached to the housing 140, the thermistor 170 is attached to the housing 140 so that the thermistor 170 engages with the voltage detection terminal 110 and restricts the voltage detection terminal 110 accommodated in the terminal accommodation recess 142 from moving in the plate thickness direction (upward). As a result, for example, it is prevented that the voltage detection terminal 110 accommodated in the terminal accommodation recess 142 accidentally moves in the plate thickness direction (upward) and hinders the attachment of the cover 130 to the housing 140. Furthermore, if the voltage detection terminal 110 moves (upward) from the original accommodation position in the plate thickness direction before the thermistor 170 is attached (for example, if the voltage detection terminal 110 is not properly accommodated in the terminal accommodation recess 142 and rides on the periphery of the terminal accommodation recess 142), the attachment of the thermistor 170 to the housing 140 is hindered by the voltage detection terminal 110, so that it can be detected that the voltage detection terminal 110 is not properly accommodated in the terminal accommodation recess 142. Therefore, the voltage detection unit 105 and the power storage device 101 according to the present embodiment have excellent operability in conductive connection with the conductive plate 104. In addition, the voltage detection unit 105 and the power storage device 101 according to the present embodiment can easily and appropriately assemble the voltage detection terminal 110 and the cover 130 to the case 140.

[0077] In addition, according to the voltage detection unit 105 of the present embodiment, the main body 172 of the thermistor 170 is adjacent to the second extension 114b extending in the plate thickness direction of the voltage detection terminal 110. This increases the size of the range that contributes to heat conduction from the voltage detection terminal 110 to the main body 172 (in other words, the contact area between them, or the area of ​​the range in which they are adjacent even if they are not in contact with each other) compared to the case where only the edge of the voltage detection terminal 110 is adjacent to the main body 172. Therefore, the thermistor 170 can accurately measure the temperature of the voltage detection terminal 110 (in other words, for example, the temperature of the storage module 102 conducted through the conductive plate 104 and the voltage detection terminal 110 in the stacked storage device 101).

[0078] Furthermore, according to the voltage detection unit 105 of the present embodiment, the voltage detection terminal 110 has a shape that does not interfere with the housing 140 between the accommodation position accommodated in the terminal accommodation recess 142 and the outer position assumed to be moved away from the housing 140 in the plate thickness direction (upward) from the accommodation position. Therefore, when the voltage detection terminal 110 is accommodated in the terminal accommodation recess 142, the voltage detection terminal 110 can be accommodated in the terminal accommodation recess 142 simply by linearly moving the voltage detection terminal 110 in the plate thickness direction (downward) toward the terminal accommodation recess 142. Therefore, for example, compared with the case where an operation of hooking the edge of the voltage detection terminal 110 to the locking hole of the housing 140 is required when accommodating the voltage detection terminal 110, the voltage detection terminal 110 can be easily accommodated in the terminal accommodation recess 142.

[0079] <Other embodiments>

[0080] The present disclosure is not limited to the above-described embodiments, and various modifications can be adopted within the scope of the present disclosure. For example, the present disclosure is not limited to the above-described embodiments, and modifications, improvements, etc. can be appropriately made. In addition, as long as the present invention can be implemented, the materials, shapes, sizes, quantities, arrangement positions, etc. of the components in the above-described embodiments are freely selected and are not limited.

[0081] Here, the features of the embodiments of the voltage detection unit 105 and the power storage device 101 described above are briefly summarized and listed in the following [1] to [4].

[0082] [1] A voltage detection unit (105), comprising:

[0083] A voltage detection terminal (110) having a first portion (112a) configured to be conductively connected to a detection object (104);

[0084] A plate-shaped housing (140) having a terminal receiving recess (142) for receiving a voltage detection terminal (110);

[0085] a cover (130) configured to be locked to the housing (140) at a temporary locking position where a first portion (112a) of a voltage detection terminal (110) accommodated in a terminal accommodation recess (142) is not covered and at a final locking position where the first portion (112a) is covered;

[0086] a temperature measuring device (170) which houses a temperature measuring element (171) and is attached to the housing (140); and

[0087] An electric wire (120) is conductively connected to the second portion (113a) of the voltage detection terminal (110) and led out to the outside of the housing (140), wherein

[0088] The temperature measuring device (170) is arranged so that at least a portion of the temperature measuring device (170) overlaps with the voltage detection terminal (110) in the plate thickness direction of the housing (140) to restrict the voltage detection terminal (110) accommodated in the terminal accommodation recess (142) from moving in the plate thickness direction.

[0089] According to the voltage detection unit having the configuration of [1] above, the cover can be locked to the housing in a state where the voltage detection terminal whose second part is connected to the electric wire is accommodated in the terminal accommodation recess of the housing and the first part of the voltage detection terminal is exposed. Therefore, when the voltage detection unit is electrically connected to the detection object (for example, a conductive plate used in a stacked power storage device, etc.), for example, after the voltage detection unit is assembled to the detection object, the exposed first part of the voltage detection terminal can be fixed to the detection object using a method such as ultrasonic bonding or welding. Compared with typical bolt fastening, etc., this does not require other components for connection, and compared with the above-mentioned prior art connection method, it is easy to align the two components and reduce the contact resistance at the contact point. Further, by setting the cover at the final locking position after the detection object and the voltage detection terminal are connected, the first part of the voltage detection terminal (that is, the contact point therebetween) can be covered and protected by the cover.

[0090] Furthermore, by attaching a temperature measuring device (e.g., a thermistor) to the housing before attaching the cover to the housing, at least a portion of the temperature measuring device overlaps with the voltage detection terminal in the plate thickness direction, which prevents the voltage detection terminal accommodated in the terminal accommodating recess from moving in the plate thickness direction (so-called riding of the voltage detection terminal). At least a portion of the temperature measuring device may be in contact with the voltage detection terminal, or may be separated from the voltage detection terminal, separating a gap that can be allowed from the perspective of limiting the movement of the voltage detection terminal. Therefore, for example, it is prevented that the voltage detection terminal accommodated in the terminal accommodating recess moves unintentionally in the plate thickness direction and hinders the attachment of the cover to the housing. Furthermore, if the voltage detection terminal moves from the original accommodating position in the plate thickness direction before the temperature measuring device is attached (e.g., if the voltage detection terminal is not properly accommodated in the terminal accommodating recess and rides on the periphery of the terminal accommodating recess), the voltage detection terminal hinders the attachment of the temperature measuring device to the housing, thereby enabling detection that the voltage detection terminal is not properly accommodated in the terminal accommodating recess.

[0091] Therefore, the voltage detection unit of the present configuration is excellent in operability of conductive connection with the detection object. In addition, the voltage detection unit of the present configuration can easily and appropriately assemble the voltage detection terminal and the cover to the housing.

[0092] [2] The voltage detection unit (105) according to [1] above, wherein

[0093] The voltage detection terminal (110) has a third portion (114b) extending in the plate thickness direction, and

[0094] The temperature measuring device (170) is arranged adjacent to the third portion (114b).

[0095] According to the voltage detection unit of [2] above, the temperature measuring device is adjacent to the third portion extending in the plate thickness direction of the voltage detection terminal. This increases the size of the range that contributes to heat conduction from the voltage detection terminal to the temperature measuring device (in other words, the contact area therebetween, or the area of ​​the range in which they are adjacent even if they are not in contact with each other) compared to the case where only the edge of the voltage detection terminal is adjacent to the temperature measuring device. Therefore, the temperature measuring device can accurately measure the temperature of the voltage detection terminal (in other words, the temperature of the storage module conducted through the conductive plate or the like as the detection object and the voltage detection terminal in the stacked storage device, for example).

[0096] [3] The voltage detection unit (105) according to [1] above, wherein

[0097] The voltage detection terminal (110) has a shape that does not interfere with the housing (140) between a housing position where the voltage detection terminal (110) is housed in a terminal housing recess (142) and an external position where the voltage detection terminal (110) is assumed to move away from the housing (140) in a plate thickness direction from the housing position.

[0098] According to the voltage detection unit configured as described above [3], the voltage detection terminal has a shape that does not interfere with the housing between a housing position accommodated in the terminal accommodating recess and an external position assumed to be moved away from the housing in the plate thickness direction from the housing position. Therefore, when the voltage detection terminal is attached, the voltage detection terminal can be accommodated in the terminal accommodating recess simply by linearly moving the voltage detection terminal from the outside of the housing (i.e., from the external position) toward the accommodating position of the terminal accommodating recess in the plate thickness direction. Therefore, for example, compared with the case where an operation is required to hook the edge of the voltage detection terminal to the locking hole of the housing when accommodating the voltage detection terminal, the voltage detection terminal can be easily accommodated in the terminal accommodating recess.

[0099] [4] An electric storage device (101), comprising:

[0100] A plate-shaped conductive module (103) comprising a voltage detection unit (105) according to any one of [1] to [3] above and a conductive plate (104) as a detection object to which a voltage detection terminal (110) is conductively connected; and

[0101] A power storage module (102) is configured to be charged and discharged, and a conductive module (103) is stacked on the power storage module (102).

[0102] According to the storage device having the configuration of [4] above, the cover can be locked to the housing in a state where the voltage detection terminal whose second part is connected to the electric wire is accommodated in the terminal accommodation recess of the housing and the first part of the voltage detection terminal is exposed. Therefore, when the voltage detection unit is electrically connected to the detection object (for example, a conductive plate used in a stacked storage device, etc.), for example, after the voltage detection unit is assembled to the detection object, the exposed first part of the voltage detection terminal can be fixed to the detection object using a method such as ultrasonic bonding or welding. Compared with typical bolt fastening, etc., this does not require other components for connection, and compared with the above-mentioned prior art connection method, it is easy to align the two components and reduce the contact resistance at the contact point. Further, by setting the cover at the final locking position after the detection object and the voltage detection terminal are connected, the first part of the voltage detection terminal (that is, the contact point therebetween) can be covered and protected by the cover.

[0103] Further, when the cover is attached to the housing, the temperature measuring device is attached to the housing so that at least a portion of the temperature measuring device overlaps with the voltage detection terminal in the plate thickness direction, and the voltage detection terminal accommodated in the terminal accommodating recess is restricted from moving in the plate thickness direction. At least a portion of the temperature measuring device may be in contact with the voltage detection terminal, or may be separated from the voltage detection terminal by a gap that can be allowed from the viewpoint of the above restriction. Therefore, for example, it is avoided that the voltage detection terminal accommodated in the terminal accommodating recess moves in the plate thickness direction accidentally and hinders the attachment of the cover to the housing. In addition, if the voltage detection terminal moves in the plate thickness direction from the original accommodating position before the temperature measuring device is attached (for example, if the voltage detection terminal is not properly accommodated in the terminal accommodating recess and rides on the periphery of the terminal accommodating recess), the voltage detection terminal hinders the attachment of the temperature measuring device to the housing, so that it can be detected that the voltage detection terminal is not properly accommodated in the terminal accommodating recess.

[0104] Therefore, the power storage device of the present configuration is excellent in operability of conductive connection with a detection object. In addition, the power storage device of the present configuration enables easy and appropriate assembly of the voltage detection terminal and the cover to the case.

Claims

1. A voltage detection unit, comprising: a voltage detection terminal having a first portion configured to be conductively connected to a detection object; a plate-shaped housing having a terminal accommodating recess for accommodating the voltage detection terminal; a cover configured to be locked to the housing in a temporary locking position and a final locking position, wherein the temporary locking position is a position where the first portion of the voltage detection terminal accommodated in the terminal accommodating recess is not covered, and the final locking position is a position where the first portion is covered; a temperature measuring device accommodating a temperature measuring element and attached to the housing; and an electric wire conductively connected to the second portion of the voltage detection terminal and led out to the outside of the housing, wherein: The temperature measurer is arranged in such a manner that at least a portion of the temperature measurer overlaps with the voltage detection terminal in a plate thickness direction of the housing to restrict movement of the voltage detection terminal accommodated in the terminal accommodation recess in the plate thickness direction.

2. The voltage detection unit according to claim 1, wherein: The voltage detection terminal has a third portion extending in the plate thickness direction; and The temperature measuring device is arranged adjacent to the third location.

3. The voltage detection unit according to claim 1, wherein: The voltage detection terminal has a shape that does not interfere with the housing between a housing position where the voltage detection terminal is housed in the terminal housing recess and an outer position where the voltage detection terminal is assumed to move away from the housing in the plate thickness direction from the housing position.

4. An electric storage device comprising: A plate-shaped conductive module, the conductive module comprising a voltage detection unit according to any one of claims 1 to 3 and a conductive plate as the detection object to which the voltage detection terminal is conductively connected; as well as A power storage module is configured to be charged and discharged, and the conductive module is stacked on the power storage module.

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