Patent Publication Number: US-2017352857-A1

Title: Electricity storage pack

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims the priority of Japanese patent application JP2014-258835 filed on Dec. 22, 2014, the entire contents of which are incorporated herein. 
     TECHNICAL FIELD 
     The present invention relates to an electricity storage pack. 
     BACKGROUND ART 
     Conventionally known is a power source apparatus provided with a battery assembly having a plurality of batteries (for example, see Patent Document 1 JP2009-4323A). The battery assembly is connected to an electric connection box. A plurality of electronic components are arranged in the electric connection box. Although not shown in detail, a wire harness connects the battery assembly to the plurality of electronic components, or connects the plurality of electronic components to each other. 
     SUMMARY 
     However, according to the above-described technology, the wire harness connects the battery assembly to the plurality of electronic components or connects the plurality of electronic components to each other, resulting in complicated wiring, and there is a concern that the size of the overall power source apparatus will increase. 
     The present design provides an electricity storage pack including an electricity storage module, a signal wire through which a signal regarding a state of the electricity storage module is transmitted, and a base member on which the electricity storage module is placed and that has a holding portion for holding the signal wire, in which the signal wire is routed in a space located between the electricity storage module and the base member. 
     According to the present design, because a detection signal wire can be routed by effectively utilizing the space located between the electricity storage module and the base member, the size of the electricity storage pack can be reduced. 
     An embodiment of the present design preferably has the following aspects. 
     It is preferable that the signal wire includes a single-core wire, the base member has a solderless terminal holding portion for holding a solderless terminal, one end of the solderless terminal has a press-contact blade and another end of the solderless terminal has a male tab, and the press-contact blade contacts the signal wire, and the male tab is introduced into a signal wire connector. 
     With the above-described aspect, the signal wire and the solderless terminal can be electrically connected with each other with a simple method of contacting the signal wire with the solderless terminal. Since the male tab of this solderless terminal is introduced into the signal wire connector, the signal wire and the other electronic device can be easily electrically connected to each other by fitting a counterpart connector to the signal wire connector. 
     It is preferable that a detection wire for detecting the state of the electricity storage module is drawn from the electricity storage module, an end of the detection wire is connected to a detection wire connector, and the detection wire and the signal wire are electrically connected to each other by the detection wire connector and the signal wire connector being fitted to each other. 
     According to the above-described aspect, the detection wire and the signal wire can be constituted by different electric wires. For example, a known method such as crimping can be used when the detection wire is connected to an electrode of the electricity storage module, and thus the detection wire preferably includes a twisted wire. On the other hand, the signal wire and the solderless terminal can be connected to each other by contacting them by pressure when the signal wire is routed on an upper side of the base member, and thus the signal wire preferably includes a single-core wire. According to this aspect, a wire including a twisted wire can be used as the detection wire, and a wire including a single-core wire can be used as the signal wire. 
     It is preferable that the electricity storage module includes a plurality of power storage elements each having a cathode and an anode, and the detection wire is a voltage detection wire that is electrically connected to at least one of the cathode and the anode. 
     According to the above-described aspect, the voltages of the power storage elements in the electricity storage module can be detected. 
     It is preferable that an electronic control unit is placed on the base member, and the signal wire is routed in a space located between the base member and the electronic control unit and is connected to the electronic control unit. 
     According to the above-described aspect, the electronic control unit is placed on the base member, the signal wire is routed in the space located between the base member and the electronic control unit and is connected to the electronic control unit. This makes it possible to increase space efficiency when the signal wire and the electronic control unit are connected to each other. 
     According to the present design, the size of the electricity storage pack can be reduced. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  shows a side view of an electricity storage pack according to Embodiment 1. 
         FIG. 2  shows a plan view of the electricity storage pack from which its cover is removed. 
         FIG. 3  shows a perspective view of the electricity storage pack from which its cover is removed. 
         FIG. 4  shows a side view of an electricity storage module. 
         FIG. 5  shows a side view of the electricity storage module. 
         FIG. 6  shows a plan view showing a state in which various signal wires are routed and various bus bars are disposed in a base member, and an electric current detection member and a fuse are attached thereto. 
         FIG. 7  shows an enlarged diagram of a portion showing a structure in which a first voltage signal wire and a solderless terminal are connected. 
         FIG. 8  shows a plan view showing a state in which various signal wire connectors are attached to the base member, from the state shown in  FIG. 6 . 
         FIG. 9  shows a perspective view of the state shown in  FIG. 8 . 
         FIG. 10  shows a plan view of a state in which a relay unit and an electronic control unit are attached to the base member, from the state shown in  FIG. 8 . 
         FIG. 11  shows a perspective view of a state shown in  FIG. 10 . 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Embodiment 1 
     Embodiment 1 of the present design will be described with reference to  FIGS. 1 to 11 . An electricity storage pack  10  according to the present embodiment is provided in a vehicle such as an electric car, a hybrid car, or an automobile (not shown). In the description below, the X direction is regarded as rightward, the Y direction is regarded as frontward, and the Z direction is regarded as upward. Note that the electricity storage pack  10  is attachable to a vehicle in any orientation. 
     As shown in  FIG. 1 , the electricity storage pack  10  includes a base member  11  made of an insulating synthetic resin, and a cover  12  for covering the base member  11 . The base member  11  has an approximately rectangular plate shape. The four corners of the base member  11  are depressed and have a recessed shape. The cover  12  is made of a synthetic resin or metal, and has an upper wall having approximately the same shape as the base member  11 , and a side wall that extends downward from the side edge of the upper wall. 
     As shown in  FIGS. 2 and 3 , an electricity storage module  13 , an electronic control unit  14 , a relay unit  15 , an electric current detection member  16 , a fuse  17 , a first output bus bar  18 , a second output bus bar  19 , and the like are arranged on the upper side of the base member  11 . Also, the upper side of the base member  11  is provided with a plurality of holding portions  20  protruding upward. First voltage signal wires  21 , second voltage signal wires  22 , relay control signal wires  23 , and output voltage signal wires  24  are routed on the upper side of the base member  11 , each wire being sandwiched between a pair of adjacent holding portions  20 . 
     As shown in  FIGS. 4 and 5 , the electricity storage module  13  is constructed by stacking a plurality (five in the present embodiment) of power storage elements  27  each having a cathode  25  and an anode  26 . The power storage elements  27  each have a power storage member (not shown) held between a pair of laminate sheets. The power storage elements  27  each have an approximately rectangular shape when viewed from above. The power storage elements  27  each have a pair of shorter sides, and the cathode  25  and the anode  26  are drawn from those shorter sides. 
     The vertically stacked power storage elements  27  are connected in series. The right end of the electricity storage module  13  is provided with a cathode output terminal  28  and an anode output terminal  29 . The cathode output terminal  28  serves as the cathode of the electricity storage module  13 , and the anode output terminal  29  serves as the anode of the electricity storage module  13 . 
     The cathode  25  and the anode  26  of each power storage element  27  are arranged on a separator  30  made of a synthetic resin. The vertically stacked separators  30  are attached to one another in a stacked state by elastically locking locking portions  31  and locked portions  32  that are formed in the separators  30 . 
     A plurality (four in the present embodiment) of first voltage detection wires  33  that are connected to the cathodes  25  or the anodes  26  of the power storage elements  27  and detect voltages of the power storage elements  27  are drawn from the right end of the electricity storage module  13 . The plurality of first voltage detection wires  33  are guided into a first detection wire connector  34 . The first voltage detection wires  33  are obtained by coating the outer circumference of twisted wires obtained by twisting a plurality of thin metal wires, with an insulating synthetic resin. 
     Also, a plurality (three in the present embodiment) of second voltage detection wires  35  that are connected to the cathodes  25  or the anodes  26  of the power storage elements  27  and detect voltages of the power storage elements  27  are drawn from the left end of the electricity storage module  13 . The plurality of second voltage detection wires  35  are guided into a second detection wire connector  36 . The second voltage detection wires  35  are obtained by coating the outer circumference of twisted wires obtained by twisting a plurality of thin metal wires, with an insulating synthetic resin. 
     As shown in  FIG. 6 , the upper side of the base member  11  is provided with two locking claws  50  that can undergo elastic deformation and protrude upward. The base member  11  and the electricity storage module  13  are assembled by engaging the locking claws  50  with locking reception portions (not shown) formed in the separators  30 . 
     As shown in  FIGS. 2 and 3 , the first output bus bar  18  is connected to the cathode output terminal  28  of the electricity storage module  13 . The first output bus bar  18  is attached onto a base  37 A protruding upward from the upper side of the base member  11 . The first output bus bar  18  is obtained by punching a metal plate material into a predetermined shape. Any metal such as copper, a copper alloy, aluminum, or an aluminum alloy can be selected as the metal as needed. In the present embodiment, copper or a copper alloy is used. The surface of the first output bus bar  18  may be provided with a plating layer. Any metal such as tin or nickel can be selected as the metal constituting the plating layer as needed. In the present embodiment, the plating layer is made of tin. 
     The second output bus bar  19  is connected to the anode output terminal  29  of the electricity storage module  13 . The second output bus bar  19  is obtained by punching a metal plate material into a predetermined shape. Any metal such as copper, a copper alloy, aluminum, or an aluminum alloy can be selected as the metal as needed. In the present embodiment, copper or a copper alloy is used. The surface of the second output bus bar  19  may be provided with a plating layer. Any metal such as tin or nickel can be selected as the metal constituting the plating layer as needed. In the present embodiment, the plating layer is made of tin. 
     The second output bus bar  19  is approximately L-shaped when viewed from above. A left end of the second output bus bar  19  is bent at an approximately right angle, serving as a terminal portion  38 . A plate surface of the terminal portion  38  is oriented orthogonally to the vertical direction. The terminal portion  38  is attached onto a base  37 B protruding upward from the upper side of the base member  11 . 
     An electric current detection member  16  is disposed on the base member  11  to the front of the second output bus bar  19  at a position spaced apart from the second output bus bar  19 . In the present embodiment, a shunt resistor for detecting an electric current is used in the electric current detection member  16 , and the electric current detection member  16  is connected in series between the anode output terminal  29  of the electricity storage module  13  and a third output bus bar  40 . The electric current detection member  16  is attached onto a base  37 C protruding upward from the upper side of the base member  11 . The electric current detection member  16  has a shape that is narrow and elongated in the horizontal direction. A voltage output from the anode output terminal  29  for the power storage elements  27  is detected based on the signal of this electric current detection member  16 . 
     A relay bus bar  39  extending in the front-rear direction is connected to the right end of the electric current detection member  16 . The relay bus bar  39  extends in the front-rear direction. The relay bus bar  39  is obtained by punching a metal plate material into a predetermined shape. Any metal such as copper, a copper alloy, aluminum, or an aluminum alloy can be selected as the metal as needed. In the present embodiment, copper or a copper alloy is used. The surface of the relay bus bar  39  may be provided with a plating layer. Any metal such as tin or nickel can be selected as the metal constituting the plating layer as needed. In the present embodiment, the plating layer is made of tin. 
     A fuse  17  is connected to a rear end of the relay bus bar  39 . The fuse  17  extends in the horizontal direction. A third output bus bar  40  is connected to the right end of the fuse  17 . The third output bus bar  40  is electrically connected to an external load (not shown). 
     The relay unit  15  is connected between the terminal portion  38  of the second output bus bar  19  and the left end of the electric current detection member  16 . The relay unit  15  includes a relay (not shown). The second output bus bar  19  and the electric current detection member  16  are conductively connected or disconnected from each other by the relay of the relay unit  15 . 
     The electronic control unit  14  is attached to the upper side of the base member  11 . The electronic control unit  14  receives signals regarding voltages of the power storage elements  27  of the electricity storage module  13 , and calculates the voltages of the power storage elements  27 . Also, the electronic control unit  14  switches the relay of the relay unit  15  between conduction and disconnection. Also, the electronic control unit  14  calculates the voltage output from the anode output terminal  29  for the power storage elements  27  based on the signals of the electric current detection member  16 . 
     As shown in  FIG. 6 , a plurality (four in the present embodiment) of first voltage signal wires  21  are routed on the upper side of the base member  11 . The first voltage signal wires  21  are obtained by coating the outer circumference of a single-core wire made of metal, with an insulating synthetic resin. 
     As shown in  FIG. 7 , one end of each of the first voltage signal wires  21  is sandwiched between solderless terminal holding portions  41 A at a position near a right rear end of the base member  11 . The solderless terminal holding portions  41 A each have a columnar shape protruding upward from the upper side of the base member  11 . Solderless terminals  42  made of metal are sandwiched between the solderless terminal holding portions  41 A. A lower end of each solderless terminal  42  is provided with a pair of press-contact blades  43 , and an upper end of the solderless terminal  42  serves as a male tab  44  having a plate shape. 
     The first voltage signal wire  21  is sandwiched between the pair of press-contact blades  43 . Accordingly, the single-core wire of the first voltage signal wire  21  is sandwiched between the pair of press-contact blades  43 , and thus the solderless terminals  42  and the first voltage signal wires  21  are electrically connected to each other. 
     The first voltage signal wires  21  extend leftward from the solderless terminal holding portions  41 A, are bent frontward at positions slightly to the left of the center in the horizontal direction of the base member  11 , and extend frontward. The first voltage signal wires  21  are routed at predetermined positions on the upper side of the base member  11  by being sandwiched between a plurality of holding portions  20 . 
     The holding portions  20  each has a columnar shape protruding upward from the upper side of the base member  11 . The first voltage signal wires  21  are routed along the upper side of the base member  11  by being sandwiched between the holding portions  20 . 
     The other end of the first voltage signal wire  21  is sandwiched between solderless terminal holding portions  41 B at a position that is located near the front end of the base member  11  and slightly to the left of the center in the horizontal direction of the base member  11 . A solderless terminal  42  is sandwiched between the solderless terminal holding portions  41 B. The configuration of the solderless terminals  42 , and the structure of connection between the solderless terminals  42  and the first voltage signal wires  21  are similar to the configuration at the above-described one end of the first voltage signal wires  21 , and thus the same members are given the same reference numerals, and their redundant description will be omitted. 
     A plurality (three in the present embodiment) of second voltage signal wires  22  are routed on the upper side of the base member  11 . The second voltage signal wires  22  are obtained by coating the outer circumference of a single-core wire made of metal, with an insulating synthetic resin. 
     One end of each of the second voltage signal wires  22  is sandwiched between solderless terminal holding portions  41 C at a position to the left end of the base member  11 . The solderless terminal  42  held by the solderless terminal holding portions  41 C is electrically connected to the other end of the second voltage signal wire  22 . 
     The second voltage signal wire  22  extends rearward from the solderless terminal holding portion  41 C, is bent at an approximately right angle, bends frontward at an approximately right angle, extends frontward, and is bent rightward at an approximately right angle at the front end. 
     The other end of the second voltage signal wire  22  is sandwiched between solderless terminal holding portions  41 B at a position that is located near the front end of the base member  11  and slightly to the left of the center in the horizontal direction of the base member  11 . The solderless terminal  42  held by the solderless terminal holding portions  41 B is electrically connected to the other end of the second voltage signal wire  22 . 
     A plurality (two in the present embodiment) of output voltage signal wires  24  are routed on the upper side of the base member  11 . The output voltage signal wires  24  are obtained by coating the outer circumference of a single-core wire made of metal, with an insulating synthetic resin. 
     The one end of the output voltage signal wire  24  is electrically connected to the electric current detection member  16 . The output voltage signal wires  24  are drawn from the electric current detection member  16  and extend leftward. The other end of the output voltage signal wire  24  is sandwiched between the solderless terminal holding portions  41 B at a position that is located near the front end of the base member  11  and slightly to the left of the center in the horizontal direction of the base member  11 . The solderless terminal  42  held by the solderless terminal holding portions  41 B is electrically connected to the other end of the output voltage signal wire  24 . 
     A plurality (four in the present embodiment) of relay control signal wires  23  are routed on the upper side of the base member  11 . The relay control signal wires  23  are obtained by coating the outer circumference of a single-core wire made of metal, with an insulating synthetic resin. 
     One end of each of the relay control signal wires  23  is sandwiched between the solderless terminal holding portions  41 B at a position that is located near the front end of the base member  11  and slightly to the left of the center in the horizontal direction of the base member  11 . The solderless terminal  42  held by the solderless terminal holding portions  41 B is electrically connected to the one end of the relay control signal wire  23 . 
     The relay control signal wires  23  extend to the right from the solderless terminal holding portion  41 B. The other end of the relay control signal wires  23  is sandwiched between solderless terminal holding portions  41 D at a position that is located near the front end of the base member  11  and near the center in the horizontal direction of the base member  11 . The solderless terminal  42  held by the solderless terminal holding portions  41 D is electrically connected to the other end of the relay control signal wires  23 . 
     As shown in  FIGS. 8 and 9 , a first signal wire connector  45  that is made of a synthetic resin and has a hood shape that is upwardly open is disposed above the solderless terminal holding portions  41 A that hold the one end of the first voltage signal wires  21 . Male tabs  44  of the solderless terminals  42  protrude upward from a bottom wall of the first signal wire connector  45 . The first signal wire connector  45  is fitted to the first detection wire connector  34 . Accordingly, the first voltage detection wires  33  and the first voltage signal wires  21  are electrically connected to each other. 
     A second signal wire connector  46  that is made of a synthetic resin and has a hood shape that is upwardly open is disposed above the solderless terminal holding portions  41 C that hold the one end of the second voltage signal wires  22 . Male tabs  44  of the solderless terminals  42  protrude upward from a bottom wall of the second signal wire connector  46 . The second signal wire connector  46  is fitted to the second detection wire connector  36 . Accordingly, the second voltage detection wires  35  and the second voltage signal wires  22  are electrically connected to each other. 
     A relay control signal wire connector  47  that is made of a synthetic resin and has a hood shape that is upwardly open is disposed above the solderless terminal holding portions  41 D that hold the other end of the relay control signal wires  23 . Male tabs  44  of the solderless terminal  42  protrude upward from a bottom wall of the relay control signal wire connector  47 . The relay control signal wire connector  47  is electrically connected to the relay unit  15  by being fitted to a connector (not shown) provided in the relay unit  15  (see  FIGS. 10 and 11 ). 
     A third signal wire connector  48  having a hood shape that is upwardly open is disposed above the solderless terminal holding portions  41 B that hold the other end of the first voltage signal wires  21 , the other end of the second voltage signal wires  22 , the other end of the output voltage signal wires  24 , and the one end of the relay control signal wires  23 . Male tabs  44  of the solderless terminals  42  protrude upward from a bottom wall of the third signal wire connector  48 . The third signal wire connector  48  is electrically connected to the electronic control unit  14  by being fitted to a connector (not shown) provided in the electronic control unit  14  (see  FIGS. 10 and 11 ). 
     A space  49  is formed between the electricity storage module  13  and the upper side of the base member  11 , the space  49  extending over the height by which the holding portions  20  located below the electricity storage module  13  protrude upward from the upper side of the base member  11 . As shown in  FIGS. 1 and 3 , the first voltage signal wires  21  are routed in this space  49 . Specifically, at least some of the first voltage signal wires  21  are held by those holding portions  20  of the base member  11  that are formed in a region located below the electricity storage module  13 , and thereby are routed in the space  49  below the electricity storage module  13 . 
     Also, the first voltage signal wires  21  are routed inside a space  51  located between the base member  11  and the electronic control unit  14 , and are connected to the electronic control unit  14 . 
     Next, an example of a process for manufacturing the electricity storage pack  10  according to the present embodiment will be described. Note that the process for manufacturing the electricity storage pack  10  is not limited to the description below. 
     As shown in  FIG. 6 , the base member  11  is formed into a predetermined shape using an insulating synthetic resin. The first output bus bar  18 , the second output bus bar  19 , a voltage sensor, the relay bus bar  39 , the fuse  17 , and the third output bus bar  40  are attached to the base member  11 . 
     The first voltage signal wires  21 , the second voltage signal wires  22 , the output voltage signal wires  24 , and the relay control signal wires  23  are routed with the holding portions  20  of the base member  11 . This step can be automated with a machine. The solderless terminals  42  are attached to the solderless terminal holding portions  41 A,  41 B,  41 C, and  41 D. 
     As shown in  FIGS. 8 and 9 , the first signal wire connector  45 , the second signal wire connector  46 , the third signal wire connector  48 , and the relay control signal wire connector  47  are routed above the solderless terminal holding portions  41 A,  41 B,  41 C, and  41 D. 
     As shown in  FIGS. 10 and 11 , the connector of the relay unit  15  is fitted to the relay control signal wire connector  47 . Also, the connector of the electronic control unit  14  is fitted to the third signal wire connector  48 . 
     As shown in  FIGS. 2 and 3 , the electricity storage module  13  is attached to the upper side of the base member  11  from above the first voltage signal wires  21 . The first detection wire connector  34  of the electricity storage module  13  is fitted to the first signal wire connector  45 . Also, the second detection wire connector  36  of the electricity storage module  13  is fitted to the second signal wire connector  46 . 
     Lastly, as shown in  FIG. 1 , the electricity storage pack  10  is completed by attaching the cover  12  to the upper side of the base member  11  from the above. 
     Next, the effects of the present embodiment will be described. An electricity storage pack  10  according to the present embodiment includes an electricity storage module  13 , first voltage signal wires  21  through which signals regarding the state of the electricity storage module  13  are transmitted, and a base member  11  on which the electricity storage module  13  is placed and has holding portions  20  for holding first voltage signal wires  21 , and the first voltage signal wires  21  are routed in a space  49  located between the electricity storage module  13  and the base member  11 . Accordingly, since the first voltage signal wires  21  can be routed by effectively utilizing the space  49  located between the electricity storage module  13  and the base member  11 , the size of the electricity storage pack  10  can be reduced. 
     Also, according to the present embodiment, the first voltage signal wires  21  each include a single-core wire, the base member  11  has solderless terminal holding portions  41 A for holding solderless terminals  42 , one end of each of the solderless terminals  42  has press-contact blades  43  and the other end has a male tab  44 , the press-contact blades  43  contact the first voltage signal wires  21 , and the male tabs  44  are introduced into a first signal wire connector  45 . Accordingly, the first voltage signal wires  21  and the solderless terminal  42  can be electrically connected to each other with a simple method for contacting the first voltage signal wires  21  and the solderless terminals  42  by pressure. Because the male tabs  44  of these solderless terminals  42  are introduced into the first signal wire connector  45 , the first voltage signal wires  21  can be easily electrically connected to the other electronic device by fitting a counterpart connector to the first signal wire connector  45 . 
     Also, according to the present embodiment, first voltage detection wires  33  for detecting the voltage of the electricity storage module  13  are drawn from the electricity storage module  13 , the ends of the first voltage detection wires  33  are connected to first detection wire connector  34 , and the first voltage detection wires  33  and the first voltage signal wires  21  are electrically connected to each other by the first detection wire connector  34  and the first signal wire connector  45  being fitted to each other. According to the present embodiment, the first voltage detection wires  33  and the first voltage signal wires  21  can be constituted by different electric wires. Moreover, a known method such as crimping can be used when the first voltage detection wires  33  are connected to the electrodes of the electricity storage module  13 , and thus the first voltage detection wires  33  preferably include twisted wires. On the other hand, the first voltage signal wires  21  and the solderless terminal can be connected to each other by contacting by pressure when the first voltage signal wires  21  are routed on the upper side of the base member  11 , and thus the first voltage signal wires  21  preferably include single-core wires. According to the present embodiment, a twisted wire can be used as the first voltage detection wire  33 , and a single-core wire can be used as the first voltage signal wire  21 . 
     Also, according to the present embodiment, the electricity storage module  13  includes the plurality of power storage elements  27  each having a cathode  25  and an anode  26 , and the first voltage detection wires  33  are electrically connected to at least one of the cathode  25  and the anode  26 . Accordingly, it is possible to detect the voltages of the power storage elements  27  in the electricity storage module  13 . 
     Also, according to the present embodiment, an electronic control unit  14  is placed on the base member  11 , the first voltage signal wires  21  are routed in a space  51  located between the base member  11  and the electronic control unit  14  and connected to the electronic control unit  14 . This makes it possible to increase space efficiency when the first voltage signal wires  21  and the electronic control unit  14  are connected. 
     Other Embodiments 
     The present invention is not merely limited to the embodiment described above using the foregoing description and drawings, and embodiments such as the following are also encompassed in the technical scope of the present invention. 
     Although the present embodiment has a configuration in which the first voltage signal wires  21  are routed in the space  49  located between the electricity storage module  13  and the base member  11 , there is no limitation to this, and for example, a configuration may also be adopted in which the second voltage signal wires  22  are routed in a space located between the electricity storage module  13  and the base member  11 , or a configuration may also be adopted in which a temperature detection wire for detecting the temperature of the electricity storage module  13  is routed in the space  49  located between the electricity storage module  13  and the base member  11 . 
     Although the holding portion  20  has a columnar shape protruding from the upper side of the base member  11  in the present embodiment, there is no limitation to this, and the holding portion may also have a rib-shape protruding from the upper side of the base member  11 . Also, the holding portion  20  may also have a groove-shape obtained by depressing the upper side of the base member  11 . In this manner, any structure that can hold a signal wire on the upper side of the base member  11  can be applied to the holding portion as appropriate. 
     Although the present embodiment has a configuration in which the first voltage signal wires  21  and the first voltage detection wires  33  are connected via the first signal wire connector  45  and the first detection wire connector  34 , there is no limitation to this, and a configuration may also be adopted in which the first voltage signal wires  21  are introduced into the electricity storage module  13  and the voltages of the power storage elements  27  are detected directly. In this case, the first voltage signal wires  21  may include twisted wires or single-core wires. 
     It is to be understood that the foregoing is a description of one or more preferred exemplary embodiments of the invention. The invention is not limited to the particular embodiment(s) disclosed herein, but rather is defined solely by the claims below. Furthermore, the statements contained in the foregoing description relate to particular embodiments and are not to be construed as limitations on the scope of the invention or on the definition of terms used in the claims, except where a term or phrase is expressly defined above. Various other embodiments and various changes and modifications to the disclosed embodiment(s) will become apparent to those skilled in the art. All such other embodiments, changes, and modifications are intended to come within the scope of the appended claims. 
     As used in this specification and claims, the terms “for example,” “e.g.,” “for instance,” “such as,” and “like,” and the verbs “comprising,” “having,” “including,” and their other verb forms, when used in conjunction with a listing of one or more components or other items, are each to be construed as open-ended, meaning that the listing is not to be considered as excluding other, additional components or items. Other terms are to be construed using their broadest reasonable meaning unless they are used in a context that requires a different interpretation. 
     REFERENCE SIGNS LIST 
     
         
         
           
               10 : Electricity storage pack 
               11 : Base member 
               13 : Electricity storage module 
               14 : Electronic control unit 
               20 : Holding portion 
               21 : First voltage signal wire 
               25 : Cathode 
               26 : Anode 
               27 : Power storage element 
               33 : First voltage detection wire 
               34 : First detection wire connector 
               41 A,  41 B,  41 C,  41 D: Solderless terminal holding portion 
               42 : Solderless terminal 
               43 : Press-contact blade 
               44 : Male tab 
               45 : First detection wire connector