Patent Publication Number: US-2023152352-A1

Title: Current detection device

Description:
TECHNICAL FIELD 
     The present invent on relates to a current detection device, and more particularly to a current detection device using a shunt resistor. 
     BACKGROUND ART 
     A shunt resistor is widely used in current detection applications. Such a shunt resistor includes a resistance element and electrodes joined to both ends of the resistance element. In general, the resistance element is made of resistance alloy such as copper-nickel alloy, copper-manganese alloy, iron-chromium alloy, or nickel-chromium alloy. The electrodes are made of highly conductive metals such as copper. A voltage detecting portion is provided on the electrode, and the voltage generated at the both ends of the resistance element is detected by connecting a conducting wire (e.g., aluminum wire) to the voltage detecting portion. 
       FIGS.  33  and  34    show an example of a conventional shunt resistor. As shown in  FIGS.  33  and  34   , the shunt resistor  100  includes a plate-shaped resistance element  105  having a predetermined thickness and width and made of a resistive alloy, and a pair of electrodes  106  and  107  made of highly conductive metal connected to both ends of the resistance element  105 . Bolt holes  108  and  109  for fixing the shunt resistor  100  with screws or the like are formed in the electrodes  106  and  107 , respectively. 
     The shunt resistor  100  further includes voltage detecting portions  120  and  121  for measuring a voltage of the resistance element  105 . In the example shown in  FIG.  33   , the voltage detecting portions  120  and  121  are formed integrally with the electrodes  106  and  107 , respectively. The voltage detecting portions  120  and  121  extend in a width direction of the electrodes  106  and  107  from side surfaces of the electrodes  106  and  107 . The voltage detecting portions  120  and  121  are arranged near the resistance element  105 . 
     In the example shown in  FIG.  34   , the voltage detecting portions  120  and  121  are pins extending vertically from the surfaces of the electrodes  106  and  107 , respectively. The voltage detecting potions  120  and  121  are arranged near the resistance element  105 . 
     CITATION LIST 
     Patent Literature 
     Patent document 1: Japanese laid-open patent publication No. 2017-5204 
     Patent document 2: Japanese laid-open patent publication No. 2007-329421 
     SUMMARY OF INVENTION 
     Technical Problem 
     A temperature coefficient of resistance (TCR) characteristic is important in the shunt resistor to allow current detection under a condition that is less affected by a temperature fluctuation. The temperature coefficient of resistance is an index that indicates a rate of change in a resistance value due to temperature. Accordingly, it is an object of the present invention to provide a current detection device using a shunt resistor that has a simple structure and can satisfy a desired temperature coefficient of resistance. 
     Solution to Problem 
     In an embodiment, there is provided a current detection device used for current detection, comprising: a resistance element; and a pair of electrodes connected to both ends of the resistance element in a first direction, the current detection device has a projecting portion projecting in a second direction, the projecting portion has a portion of the resistance element and portions of the pair of electrodes, the first direction is a direction in which the pair of electrodes are arranged, and the second direction is perpendicular to the first direction, each electrode has a first wall portion along the first direction forming a portion of the projecting portion, and a second wall portion along the second direction forming the portion of the projecting portion, each electrode has a detection area demarcated by the first wall portion, the second wall portion, a leading end portion, and a contact surface, the leading end portion being a boundary between the projecting portion and a body of the electrode, the contact surface being at least partially in contact with the resistance element, and each electrode has a voltage detecting portion, the voltage detecting portion being arranged in the detection area with a gap between the leading end portions. 
     In an embodiment, the voltage detecting portion is arranged closer to the resistance element than a center of the detection area. 
     In an embodiment, the detection area projects more than the resistance element in a thickness direction of the current detection device. 
     In an embodiment, a length of the first wall portion is longer than a length of the second wall portion. 
     In an embodiment, the current detection device further includes a wiring substrate, the wiring substrate comprises a detection pad connected to the voltage detecting portion. 
     In a reference example, there is provided a plate shunt resistor used for current detection, comprising: a resistance element; and a pair of electrodes connected to both ends of the resistance element in a first direction, the shunt resistor has a projecting portion formed on a first side surface of the shunt resistor, the first side surface being parallel to the first direction, and a recessed portion formed on a second side surface of the first side surface of the shunt resistor, the second side surface being an opposite side of the first side surface, the recessed portion extending in the same direction as the projecting portion, the projecting portion has a portion of the resistance element and portions of the pair of electrodes, and the recessed portion has a side of the resistance element parallel to the first direction. 
     In a reference example, a length of the recessed portion in the second direction perpendicular to the first direction is the same as a length of the projecting portion in the second direction. 
     In a reference example, the projecting portion includes a pair of voltage detecting portions connected to both ends of the resistance element in the first direction. 
     In a reference example, the projecting portion and the recessed portion have a rectangular shape. 
     In a reference example there is provided a method for manufacturing a shunt resistor comprising: a resistance element; and a pair of electrodes connected to both ends of the resistance element, preparing a long shunt resistor base material in which the pair of electrodes are connected to the both ends of the resistance element in a first direction; forming a projecting portion of the first shunt resistor having a portion of the resistance element of a first shunt resistor and portions of the pair of electrodes of the first shunt resistor by cutting the shunt resistor base material in the first direction in a convex shape; forming a recessed portion extending in the same direction as the projecting portion of the first shunt resistor and a projecting portion of a second shunt resistor by cutting the shunt resistor base material in the first direction into a convex shape spaced apart from the projecting portion, the projecting portion of the second shunt resistor has a portion of the resistance element of the second shunt resistor and portions of the pair of electrodes of the second shunt resistor. 
     In a reference example, there is provided a current detection device comprising: the above shunt resistor; and a current detection circuit substrate having a voltage signal wiring transmitting a voltage signal from the shunt resistor, the voltage signal wiring is electrically connected to as projecting portion of the shunt resistor. 
     In a reference example, the current detection circuit substrate further has a voltage terminal pad, the voltage terminal pad is connected to the projecting portion and the voltage signal wiring. 
     In a reference example, the current detection device further includes an output terminal outputting a voltage signal from the shunt resistor, and the output terminal is attached to the recessed portion of the shunt resistor. 
     Advantageous Effects of invention 
     The desired temperature coefficient of resistance can be satisfied by arranging the voltage detecting portion at a desired position with a gap between the leading end portions in the detection area of the electrode which constitutes a portion of the projecting portion of the current detection device. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a perspective view showing one embodiment of a shunt resistor; 
         FIG.  2    is a plan view of the shunt resistor shown in  FIG.  1   ; 
         FIG.  3    is an enlarged view of a projecting portion and a recessed portion; 
         FIG.  4    is a perspective view showing an embodiment of a current detection device including the shunt resistor; 
         FIG.  5    is a perspective view showing the current detection device when a case of a voltage output device is removed; 
         FIG.  6    is a schematic view showing a state in which a voltage detection terminal is provided in the voltage detecting portion; 
         FIG.  7    is a graph showing a rate of change in a resistance value of the shunt resistor due to a temperature change; 
         FIG.  8    is a plan view of one embodiment of a shunt resistor without the recessed portion; 
         FIG.  9    graph showing a relationship between a length of the projecting portion in a second direction and a rate of change in the resistance value of the shunt resistor; 
         FIG.  10    is a graph showing a relationship between the length of the projecting portion of the shunt resistor and the rate of change in the resistance value of the shunt resistor; 
         FIG.  11    is a graph showing the rate of change in the resistance value of the shunt resistor; 
         FIG.  12    is a perspective view showing another embodiment of the shunt resistor; 
         FIG.  13    is enlarged view of the projecting portion of  FIG.  12   ; 
         FIG.  14    is a view showing an example of manufacturing processes of the shunt resistor; 
         FIG.  15    is a schematic view showing still another embodiment of the shunt resistor; 
         FIG.  16    is a schematic view showing still another embodiment of the shunt resistor; 
         FIG.  17    is a schematic view showing still another embodiment of the shunt resistor; 
         FIG.  18    is a schematic view showing still another embodiment of the shunt resistor; 
         FIG.  19    is a schematic view showing another embodiment of the manufacturing method of the shunt resistor; 
         FIG.  20    is a schematic view showing another embodiment of the manufacturing method of the shunt resistor; 
         FIG.  21    is a perspective view showing another embodiment of the current detection device; 
         FIG.  22    is a side view of the current detection device shown in  FIG.  21   ; 
         FIG.  23    is an enlarged view of the projecting in  FIG.  21   ; 
         FIG.  24    is a schematic view for explaining positions of voltage detecting portions; 
         FIG.  25    is a graph showing an amount of change in the resistance value of the shunt resistor due to change in temperature for each detection position shown in  FIG.  24   ; 
         FIG.  26 A  is a schematic view showing still another embodiment of the current detection device; 
         FIG.  26 B  is a schematic view showing still another embodiment of the current detection device; 
         FIG.  27 A  is a schematic view showing still another embodiment of the current detection device; 
         FIG.  27 B  is a schematic view showing still another embodiment of the current detection device; 
         FIG.  28 A  is a view for explaining the positions of the voltage detecting portions; 
         FIG.  28 B  is a view for explaining the positions of the voltage detecting portions; 
         FIG.  29    is a schematic view showing an example in which a voltage detection member is connected across steps; 
         FIG.  30    is a schematic view showing another embodiment of the projecting portion; 
         FIG.  31    is a schematic view showing another embodiment of the projecting portion; 
         FIG.  32    is a schematic view showing still another embodiment of the current detection device; 
         FIG.  33    is a view showing an example of a conventional shunt resistor; and 
         FIG.  34    is a view showing an example of a conventional shunt resistor. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Embodiments of the present invention will now be described with reference to the drawings. In the drawings described hereinbelow, the same symbols are used to refer to the same or equivalent components or elements, and a duplicate description thereof is omitted. In a plurality of embodiments described below, configurations of one embodiment not specifically described are the same as the other embodiments, so its redundant description is omitted. 
       FIG.  1    is a perspective view showing one embodiment of a shunt resistor  1 , and  FIG.  2    is a plan view of the shunt resistor  1  shown in  FIG.  1   . As shown in  FIGS.  1  and  2   , the shunt resistor  1  includes a resistance element  5  made of a resistor alloy plate material having a predetermined thickness and width, and a pair of electrodes  6  and  7  made of a highly conductive metal connected to both ends (i.e., both connecting surfaces)  5   a  and  5   b  of the resistance element  5  in a first direction. The electrode  6  has a contact surface  6   a  that contacts one end (one connecting surface)  5   a  of the resistance element  5 , and the electrode  7  has a contact surface that contacts the other end (other connecting surface)  5   b  of the resistance element  5 . Bolt holes  8  and  9  for fixing the shunt resistor  1  with screws or the like are formed in the electrodes  6  and  7 , respectively. 
     The first direction is a length direction of the resistance element  5  and corresponds to the length direction of the shunt resistor  1 . The length direction of the shunt resistor  1  is a direction in which the electrode  6 , the resistance element  5 , and the electrode  7  are arranged in this order. A direction perpendicular to this first direction is a second direction. The second direction is a width direction of the shunt resistor  1 . As shown in  FIGS.  1  and  2   , the electrodes  6  and  7  have the same structure and are arranged symmetrically with respect to the resistance element  5 . 
     The both ends  5   a  and  5   b  of the resistance element  5  are connected (bonded) to the electrodes  6  and  7  by means of welding (e.g., electron beam welding, laser beam welding, or brazing), respectively. An example of the material of the resistance element  5  is as low-resistance alloy material such as a Cu—Mn alloy. An example of the material of the electrodes  6  and  7  is copper (Cu). 
     The shunt resistor  1  has a projecting portion  11  formed on a side surface  1   a  of the shunt resistor  1 , and a recessed portion  12  formed on a side surface  1   b  of the shunt resistor  1 . The projecting portion  11  extends outward from the side surface  1   a,  and the recessed portion  12  extends inward (toward a center of the shunt resistor  1 ) from the side surface  1   b.  Both the projecting portion  11  and the recessed portion  12  extend in the same direction (second direction). The projecting portion  11  and the recessed portion  12  have a rectangular shape when viewed from above (when viewed from a direction perpendicular to both the first direction and the second direction). 
     The side surface  1   a  is a surface of the shunt resistor  1  parallel to the first direction, and has a side surface  6   c  of the electrode  6  and a side surface  7   c  of the electrode  7 . The side surface  1   b  is a surface of the shunt resistor  1  parallel to the first direction, and the surface opposite to the side surface  1   a.  The side surface  1   b  has a side surface  6   b  of the electrode  6  and a side surface  7   b  of the electrode  7 . The side surfaces  6   b  and  7   b  are surfaces parallel to the side surfaces  6   c  and  7   c.    
       FIG.  3    is an enlarged view of the projecting portion  11  and the recessed portion  12 . The projecting portion  11  has a portion of the resistance element  5  and a portion of the electrodes  6  and  7 . Specifically, the protecting portion  11  has a portion  14  which is a portion of the resistance element  5  and voltage detecting portions  20  and  21  for measuring voltages generated at the both ends  5   a  and  5   b  of the resistance element  5 . The length of the portion  14  in the second direction is represented by a length t 1  (the length t 1  of the projecting portion  11  in the second direction) that is a distance from the side surfaces  6   c  and  7   c  of the electrodes  6  and  7  to the side surface  5   c  of the resistance element  5 . 
     The voltage detecting portions  20  and  21  are portions of the electrodes  6  and  7 , respectively. That is, the electrode  6  has the voltage detecting portion  20 , and the electrode  7  has the voltage detecting portion  21 . The voltage detecting portion  20  extends outward from the side surface  6   c  of the electrode  6 , and the voltage detecting portion  21  extends outward from the side surface  7   c  of the electrode  7 . The voltage detecting portions  20  and  21  are connected to the both ends  5   a  and  5   b  of the resistance element  5 , respectively. The voltage detecting portions  20  and  21  are arranged symmetrically with respect to the portion  14 . The length of the voltage detecting portions  20  and  21  in the second direction is also represented by the length t 1 . 
     The recessed portion  12  has a side surface  5   d  of the resistance element  5  parallel to the first direction. Specifically, in the present embodiment, the side surface  12   c  of the recessed portion  12  in the first direction (see  FIG.  2   ) is composed of a side surface  6   d  of the electrode  6 , a side surface  5   d  of the resistance element  5 , and a side surface  7   d  of the electrode  7 . In this embodiment, at width W 1  (a length of the projecting portion  11  in the first direction) of the projecting portion  11  and a width W 2  (a length of the recessed portion  12  the first direction) of the recessed portion  12  are the same, and the length t 1  of the projecting portion  11  in the second direction (i.e., the width direction of the shunt resistor  1 ) and the length t 2  of the recessed portion  12  in the second direction are the same. A position of the projecting portion  11  in the first direction and a position of the recessed portion  12  in the first direction are the same. That is, a side surface  11   a  of the projecting portion  11  is arranged on an extension line of the side surface  12   a  of the recessed portion  12 , and a side surface  11   b  of the projecting portion  11  is arranged on an extension line of the side surface  12   b  of the recessed portion  12 . 
       FIG.  4    is a perspective view showing an embodiment of a current detection device  30  including the shunt resistor  1 . The current detection device  30  further includes voltage output device  31  that outputs a voltage (the voltage generated at the both ends  5   a  and  5   b  of the resistance element  5 ) of the resistance element  5 . The voltage output device  31  is connected to the shunt resistor  1 . The voltage output device  31  includes a non-conductive case  32  covering the resistance element  5 , and an output terminal  35  (output connector  35 ) for outputting a voltage signal (voltage of the resistance element  5 ) from the shunt resistor  1 . The output connector  35  includes a first terminal, a second terminal, and a ground terminal (not shown). 
       FIG.  5    is a perspective view showing the current detection device  30  when the case  32  of the voltage output device  31  is removed. As shown in  FIG.  5   , the voltage output device  31  further includes a current detection circuit substrate  34 . The current detection circuit substrate  34  has voltage signal wirings  46  and  47  for transmitting the voltage signal (voltage of the resistance element  5 ) from the shunt resistor  1  to the output terminal  35  and a ground wiring  50 . A current detection circuit substrate  34  is arranged on the shunt resistor  1 , and an output terminal  35  is attached to the recessed portion  12 . 
     The current detection circuit substrate  34  further has voltage terminal pads  36  and  37  (copper foil portions  36  and  37 ). One end of the voltage signal wiring  46  is connected to the voltage terminal pad  36 , and the other end is connected to the first terminal of the output connector  35 . One end of the voltage signal wiring  47  is connected to the voltage terminal pad  37 , and the other end is connected to the second terminal of the output connector  35 . The voltage signal wirings  46  and  47  are bent and wired from the second direction (see  FIG.  2   ) to the first direction (see  FIG.  2   ) above the projecting portion  11 . One end of the ground wiring  50  is connected to the voltage terminal pad  36 , and the other end is connected to the ground terminal of the output connector  35 . The voltage signal wirings  46  and  47 , the ground wiring  50 , and the voltage terminal pads  36  and  37  are made of a highly conductive metal (copper in this embodiment). 
     The voltage terminal pad  36  is connected to the voltage detecting portion  16  (see  FIG.  3   ) of the voltage detecting portion  20  of the projecting portion  11  via an internal wiring not shown on the current detection circuit substrate  34 . Similarly, the voltage terminal pad  37  is connected to a voltage detecting position  17  (see  FIG.  17   ) of the voltage detecting portion  21  of the projecting portion  11  via the internal wiring not shown. In other words, the voltage signal wirings  46  and  47  are electrically connected to the voltage detecting positions  20  and  21  of the projecting portion  11 , respectively. The above-described internal wiring and the voltage detecting portions  20  and  21  are connected by soldering or other methods. An operator connects a cable including a connector that mates with the output terminal  35  to measure the voltage generated at the both ends  5   a  and  5   b  of the resistance element  5 . This configuration allows for easy measurement of the voltage of the resistance element  5 . In one embodiment, an operational amplifier (amplifier), an A/D converter, and/or a temperature sensor for amplifying the voltage signal from the shunt resistor  1  may be mounted on the current detection circuit substrate  34 . 
     In one embodiment, as shown in  FIG.  6   , voltage detection terminals  38  and  39  may be provided on the voltage detecting portions  20  and  21 , respectively. The voltage detection terminals  38  and  39  are conductive pins extending vertically from the surfaces of the voltage detecting portions  20  and  21 , respectively. Specifically, the voltage detection terminals  38  and  39  are connected to the voltage detecting positions  16  and  17  of the voltage detecting portions  20  and  21  by soldering or the like, respectively. The voltage generated at the both ends of the resistance element  5  is measured by connecting conductive wires (e.g., aluminum wires) to the voltage detection terminals  38  and  39 , respectively, or inserting the voltage detection terminals  38  and  39  into through holes formed in a circuit substrate to electrically connect to the wiring formed in the circuit substrate. With such a configuration, the voltage of the resistance element  5  can be measured with a simple configuration. 
       FIG.  7    is a graph showing a rate of change in a resistance value of the shunt resistor  1  due to the temperature change. A horizontal axis of  FIG.  7    indicates the temperature of the shunt resistor  1 , and a vertical axis of  FIG.  7    indicates the rate of change in the resistance value of the shunt resistor  1 . A curve indicated by a solid line indicates the rate of change in the resistance value of the shunt resistor  1  of this embodiment, and a curve indicated by a dotted line indicates the rate of change in the resistance value of the conventional shunt resistor (the shunt resistor  100  shown in  FIG.  33   ).  FIG.  7    shows results when a copper-manganese alloy is used as the resistance element  5 . 
     As is clear from a comparison of a fluctuation range of the rate of change in the resistance value of the shunt resistor  1  of the present embodiment and a fluctuation range of the rate of change in the resistance value of the conventional shunt resistor, the shunt resistor  1  of the present embodiment can reduce the fluctuation range of the rate of change in the resistance value due to the temperature change. That is, results of  FIG.  7    show that the shunt resistor  1  can reduce the temperature coefficient of resistance (TCR). By forming the projecting portion  11  having the portion of the resistance element  5  and the portions of the electrodes  6  and  7  as described above, equipotential lines are distorted, and as a result, the temperature coefficient of resistance of the shunt resistor  1  can be reduced. 
       FIG.  8    is a plan view of one embodiment of a shunt resistor  200  without the recessed portion  12 . Configurations of the shunt resistor  200  are the same as the shunt resistor  1  except that it does not have the recessed portion  12 . That is, the shunt resistor  200  includes a resistance element  205  corresponding to the resistance element  5  of the shunt resistor  1 , and a pair of electrodes  206  and  207  connected to both ends of the resistance element  205 . The electrodes  206  and  207  correspond to the electrodes  6  and  7  of the shunt resistor  1 . The shunt resistor  200  has a projecting portion  211  corresponding to the projecting portion  11  of the shunt resistor  1 , and the projecting portion  211  has a portion of the resistance element  205  and portions of the electrodes  206  and  207 . The projecting portion  211  includes voltage detecting portions  220  and  221  that are portions of the electrodes  206  and  207  arranged symmetrically with respect to the resistance element  205 . 
       FIG.  9    is a graph showing a relationship between a length t 3  of the projecting portion  211  in the second direction and the rate of change in the resistance value of the shunt resistor  200 .  FIG.  9    shows results when a copper-manganese alloy is used as the resistance element  205  for a shape of the shunt resistor shown in  FIG.  8   . A vertical axis of  FIG.  9    indicates the rate of change in the resistance value when the temperature of the shunt resistor  200  rises from 25° C. to 100° C. The results of  FIG.  9    show that the rate of change in the resistance value of the shunt resistor  200  depends on the length t 3 . More specifically, as the length t 3  increases, the rate of change in the resistance value decreases. 
       FIG.  10    is a graph showing the relationship between the length t 1  of the projecting portion  11  of the shunt resistor  1  and the rate of change in the resistance value of the shunt resistor  1 .  FIG.  10    shows results when a copper-manganese alloy is used as the resistance element  5  for a shape of the shunt resistor shown in  FIG  2   . The length t 2  of the recessed portion  12  is the same as the length t 1 . The vertical axis of  FIG.  10    indicates the rate of change in the resistance value when the temperature of the shunt resistor  1  rises from 25° C. to 100° C. Similar to the results in  FIG.  9   , the results in  FIG.  10    indicates that the rate of change in the resistance value of the shunt resistor  1  depends on the length t 1 , and the length t 1  increases, the rate of change in the resistance value decreases. For example, when the length t 1  is 2 mm, the rate of change in the resistance value of the shunt resistor  1  is about 0%. 
     As shown in  FIG.  10   , a rate at which the rate of change in the resistance value of the shunt resistor  1  decreases is the same as a rate at which the rate of chance in the resistance value of the shunt resistor  200  shown in  FIG.  9    decreases. That is, the results of  FIG.  10    show that the rate of change in the resistance value depending on the temperature of the shunt resistor  1  depends on the length t 1  of the projecting portion  11  rather than the recessed portion  12 . Therefore, the results of  FIG.  10    show that the temperature coefficient of resistance of the shunt resistor  1  can be corrected and reduced by adjusting the length t 1 . 
       FIG.  11    is a graph showing the rate of change in the resistance value of each of shunt resistor  1  and the shunt resistor  200 .  FIG.  11    shows the rates of change of the resistance value of the shunt resistors  1  and  200  due to changes in the lengths t 1  and t 3  of the projecting portion  11  and  211  at a predetermined temperature (constant temperature). The length t 2  of the recessed portion  12  is the same as the length t 1 . The results of  FIG.  11    show that the resistance value of the shunt resistor  200  without the recessed portion  12  varies greatly depending on the length t 3  of the projecting portion  211 . For example, the resistance value of the shunt resistor  200  when the length t 3  is 1.5 mm is approximately 8% lower than the resistance value when the length t 3  is 0 mm. This is because the formation of the projecting portion  211  increases the length of the resistance element  205  in the second direction and changes the resistance value of the resistance element  205 . 
     As shown in  FIG.  11   , in the shunt resistor  1  having the recessed portion  12 , the change in the resistance value of the shunt resistor  1  due to the change in the length t 1  is suppressed. This is because the length of the resistance element  5  in the second direction is kept constant by forming the recessed portion  12  having the side surfaces  5   d  of the resistance element  5 . That is, it is possible to suppress the change in the resistance value of the shunt resistor  1  due to a formation of the projecting portion  11  by forming the recessed portion  12 . 
     Therefore, by adjusting the length t 1  of the projecting portion  11  and the length t 2  of the recessed portion  12  of the shunt resistor  1  according to a size and a shape of the shunt resistor  1 , the desired TCR can be satisfied while maintaining the desired resistance value. Therefore, according to this embodiment, with a simple structure in which the projecting portion  11  having the portion of the resistance element  5  and the portions of the electrodes  6  and  7  is formed on the side surface  1   a  of the shunt resistor  1 , and in which the recessed portion  12  having the side surface  5   d  of the resistance element  5  is formed on the side surface  1   b  of the shunt resistor  1 , it is possible to reduce the temperature coefficient of resistance of the shunt resistor  1  while maintaining a desired resistance value. 
       FIG.  12    is a perspective view showing another embodiment of the shunt resistor  1 , and  FIG.  13    is an enlarged view of the projecting portion  11  of  FIG.  12   . Configurations of this embodiment, which will not be particularly described, are the same as those of the embodiments described with reference to  FIGS.  1  to  3   , and redundant descriptions thereof will be omitted. The resistance element  5  of this embodiment has a cut portion  25 . The cut portion  25  extends parallel to the end surfaces  5   a  and  5   b  (in the second direction shown in  FIG.  2   ). The cut portion  25  has a slit-like shape extending linearly. The cut portion  25  is formed on the side surface  5   c  of the resistance element  5  and linearly extends from the side surface  5   c  toward an inside of the shunt resistor  1  (the central portion of the shunt resistor  1 ). 
     The resistance value of the shunt resistor can be adjusted by forming the cut portion  25  in the resistance element  5 , and in addition, the TCR of the shunt resistor  1  can be finely adjusted. Specifically, the TCR can be increased by narrowing a width W 3  of the cut portion  25  in the first direction and increasing a length t 4  in the second direction. Also in this embodiment, the current detection device  30  described with reference to  FIGS.  4  and  5    and the voltage detection terminals  38  and  39  described with reference to  FIG.  6    can be applied. 
     Next, a method for manufacturing the shunt resistor  1  will be described.  FIGS.  14 ( a ) to  14 ( f )  are views showing an example of manufacturing processes of the shunt resistor  1 . The bolt holes  8  and  9  are omitted in  FIGS.  14 ( a ) to  14 ( f ) . 
     First, as shown in  FIG.  14 ( a ) , a long (belt-shaped) shunt resistor base material  60  (metal plate material) in which the electrodes  6  and  7  are connected to the both ends of the resistance element  5  in the first direction is prepared. Next, as shown in  FIG.  14 ( b ) , the shunt resistor base material  60  is cut in a direction in which the electrode  6 , the resistance element  5 , and the electrode  7  are arranged (i.e., the first direction). Specifically, the shunt resistor base material  60  is cut in the first direction in a convex shape. The convex shape is a shape corresponding to the projecting portion  11  of the shunt resistor  1 . The side surface  1   a  and the projecting portion  11  of the shunt resistor  1  (first shunt resistor  1 A) are formed ( FIG.  14 ( c )  by cutting the shunt resistor base material  60  in the first direction in the convex shape. 
     Next, as shown in  FIG.  14 ( c ) , spacing in the second direction from the projecting portion  11  and the side surface  1   a,  and the shunt resistor base material  60  is cut in the first direction and in a convex shape, as in  FIG.  14 ( b ) . As a result, the first shunt resistor  1 A is separated from the shunt resistor base material  60 , and the side surface  1   b  of a first shunt resistor  1 A, the recessed portion  12  of the first shunt resistor  1 A, the projecting portion  11  of the other shunt resistor  1  (second shunt resistor  1 B), and the side surface  1   a  of the second shunt resistor  1 B are formed ( FIG.  14 ( d ) ). 
     Next, as shown in  FIGS.  14 ( e ) and  14 ( f ) , spacing in the second direction from the projecting portion  11  and the side surface  1   a  of the second shunt resistor  1 B, and the shunt resistor base material  60  is cut in the first direction and in a convex shape, as in  FIGS.  14 ( c ) and  14 ( d ) . As a result, the second shunt resistor  1 B is separated from the shunt resistor base material  60 , and the side surface  1   b  of the second shunt resistor  1 B and the recessed portion  12  of the second shunt resistor  1 B are formed. A plurality of shunt resistors  1  are manufactured by repeating steps of  FIGS.  14 ( c ) to  14 ( f ) . 
     By manufacturing methods shown in  FIGS.  14 ( a ) to  14 ( f ) , the shunt resistor  1  can be manufactured in a simple manner, and the shunt resistor base material  60  can be used without waste. As a result, cost reduction can be achieved. 
       FIGS.  15  to  18    are schematic views showing still another embodiment of the shunt resistor  1 . Configurations of this embodiment, which will not be particularly described, are the same as those of the embodiments described with reference to  FIGS.  1  to  3   , and redundant descriptions thereof will be omitted. In  FIGS.  15  to  18   , the bolt holes  8  and  9  are omitted. In the embodiments shown in  FIGS.  15  to  18   , the current detection device  30  described with reference to  FIGS.  4  and  5   , and the voltage detection terminals  38  and  39  described with reference to  FIG.  6    can be applied. 
     In one embodiment, as shown in  FIG.  15   , the side surfaces  11   a  and  11   b  of the projecting portion  11  and the side surfaces  12   a  and  12   b  of the recessed portion  12  may be formed obliquely with respect to the second direction (see  FIG.  2   ). In an example shown in  FIG.  15   , the side surfaces  11   a  and  11   b  extend away from the resistance element  5 . The side surface  12   a  is formed parallel to the side surface  11   a,  and the side surface  12   b  is formed parallel to the side surface  11   b.    
     In one embodiment, as shown in  FIG.  16   , the voltage detecting portions  20  and  21  may have cut portions  20   a  and  20   b  extending from the side surface  11   a  and  11   b  toward the resistance element  5 , respectively. In one embodiment, as shown in  FIG.  17   , the width W 2  of the recessed portion  12  may be larger than the width W 1  of the projecting portion  11 . As shown in  FIG.  18   , and the width W 2  may be smaller than the width W 1 . 
       FIG.  19    is a schematic view showing another embodiment of the manufacturing method of the shunt resistor  1 . As shown in  FIG.  19   , the shunt resistor  1  may be manufactured by punching the shunt resistor base material  60  into an external shape of the shunt resistor  1 . As shown in  FIG.  20   , the shunt resistor  1  of the embodiment shown in  FIG.  17    may be manufactured by the same method as described with reference to  FIG.  19   . 
       FIG.  21    is a perspective view showing another embodiment of the current detection device  30 , and  FIG.  22    is a side view of the current detection device  30  shown in  FIG.  21   . The current detection device  30  of this embodiment includes the shunt resistor  1 . In other words, the current detection device  30  of this embodiment is the shunt resistor  1  itself. The shunt resistor  1  shown in  FIGS.  21  and  22    shows another embodiment of the shunt resistor  1  described with reference to  FIGS.  1  to  7    and  FIGS.  10  to  20   . The configuration of the shunt resistor  1  of this embodiment, which is not described in particular, is the same as the embodiment described with reference to  FIGS.  1  to  3   , so its redundant description is omitted. 
     In this embodiment, the electrodes  6  and  7  have first wall portions  66   b  and  67   b  along the first direction forming the portion of the projecting portion  11 , and second wall portions  66   a  and  67   a  along the second direction forming the portion of the projecting portion  11 . The first walls  66   b  and  67   b  are formed on the same plane as the side surface  5   c  of the resistance element  5 . The second wall portions  66   a  and  67   a  correspond to the side surfaces  11   a  and  11   b  described above. In this embodiment, the first wall portion  66   b  and the first wall portion  67   b  have the same length, and the second wall portion  66   a  and the second wall portion  67   a  have the same length. 
     The electrode  6  has a detection area  66  demarcated by the first wall portion  66   b,  the second wall portion  66   a,  a leading end portion  66   c,  which is a boundary between the projecting portion  11  and a body  6   f  of the electrode  6 , and the contact surface  6   a,  which is at least partially in contact with the resistance element  5 . The electrode  7  has a detection area  67  demarcated by the first wall portion  67   b,  the second wall portion  67   a,  a leading end portion  67   c,  which is a boundary between the projecting portion  11  and a body  7   f  of the electrode  7 , and the contact surface  7   a,  which is at least partially in contact with the resistance element  5 . 
     The bodies  6   f  and  7   f  are portions of the electrodes  6  and  7  other than a portion forming the projecting portion  11 . In other words, the bodies  6   f  and  7   f  are portions that form a main current path. A main current is a main flow of current. The current also flows through the projecting portion  11 , but mainly flows through the body  6   f,  a body of the resistance element  5  (a portion other than the portion  14  of the resistance element  5 ), and the body  7   f.  The leading end portion is an imaginary straight line extending from the side surfaces  6   c  and  7   c  of the electrodes  6  and  7  (bodies  6   f  and  7   f ) toward the resistance element  5 . 
     As shown in  FIGS.  21  and  22   , the thicknesses of the electrodes  6  and  7  are thicker than that of the resistance element  5  in this embodiment. As shown in  FIG.  22   , back surfaces of the electrodes  6  and  7  and a back surface of the resistance element  5  are on the same plane, and surfaces  6   e  and  7   e  of the electrodes  6  and  7  are higher than a surface  5   e  of the resistance element  5 . A step  18  is formed by the surface  6   e  of the electrode  6 , the contact surface  6   a,  and the surface  5   e  of the resistance element  5 . A step  19  is formed by the surface  7   e  of the electrode  7 , the contact surface  7   a,  and the surface  5   e  of the resistance element  5 . A space SP is formed by the step  18  and  19  and the surface  5   e.    
     In other words, the detection areas  66  and  67  project from the resistance element  5  in the thickness direction (thickness direction of the shunt resistor  1 ) of the current detection device  30 . The thickness direction of the current detection device  30  (shunt resistor  1 ) is a direction perpendicular to both the first direction and the second direction. According to the structure of the shunt resistor  1 , when a substrate such as the current detection circuit substrate  34  is placed on the surface of the shunt resistor  1 , a gap (space SP) is formed between the resistance element  5  and the substrate. This can prevent a heat generated by the resistance element  5  from being directly transmitted to the substrate. It is also possible to arrange wirings (e.g., voltage signal wirings  46  and  47 ) for voltage detection on the space SP. There is no resistance element  5  between the detection areas  66  and  67 . Therefore, since the current flowing through the shunt resistor  1  avoids the surfaces of the detection areas  66  and  67 , stable voltage detection can be performed. In one embodiment, the electrodes  6  and  7  and the resistance element  5  may have the same thickness. Furthermore, in one embodiment, the shunt resistor  1  may not have the recessed portion  12 . 
       FIG.  23    is an enlarged view of the projecting portion  11  in  FIG.  21   . In the embodiment described with reference to  FIGS.  1  to  3   , the voltage detecting portions  20  and  21  are entire portions of the electrodes  6  and  7  forming the projecting portion  11  of the electrodes  6  and  7 . In this embodiment, the voltage detecting portions  20  and  21  are arranged in the detection areas  66  and  67  with a gap between the leading end portions  66   c  and  67   c.  The positions and the shapes of the voltage detecting portions  20  and  21  are not limited to the position and the shape shown in  FIG.  23   . 
       FIG.  24    is a schematic view for explaining the positions of the voltage detecting portions  20  and  21 , and  FIG.  25    is a graph showing an amount of change in the resistance value of the shunt resistor  1  due to change in temperature for each detection position shown in  FIG.  24   .  FIG.  25    shows simulation results of temperature characteristics of the resistance value of the shunt resistor  1  when the voltage detecting portions  20  and  21  are arranged at detection positions A to D in  FIG.  24   . In the simulation, a voltage drop of the shunt resistor  1  (voltage of the resistance element  5 ) is measured from the voltage detecting portions  20  and  21  at each of the detection positions A to D, and the resistance value of the shunt resistor  1  is calculated from the measured voltage. In the simulation, a material of the resistance element  5  is assumed to the Ni—Cr alloy. In the simulation, both the length t 1  of the second wall portions  66   a  and  67   a  and a length PW of the first wall portions  66   b  and  67   b  are set to 2 mm. 
     For example, if the voltage detecting portions  20  and  21  are arranged at the leading end portions  66   c  and  67   c,  i.e., arranged on the main current side (bodies  6   f  and  7   f  side), the temperature characteristics of the resistance value of the shunt resistor  1  obtained from the voltage detecting portions  20  and  21  approximate the temperature characteristics of the resistance element  5  itself. Therefore, since the detection position D approximates the leading end portions  66   c  and  67   c,  the temperature characteristics of the shunt resistor  1  when the voltage detecting portions  20  and  21  are arranged at the detection position D are similar to the temperature characteristics of the resistance element  5 . 
     On the other hand, as shown in  FIG.  25   , a slope of the temperature characteristic becomes clockwise (slope of the temperature characteristic becomes smaller) as the voltage detecting portions  20  and  21  are farther from the leading end portions  66   c  and  67   c  and approximates a terminal end portion (first wall portions  66   b  and  67   b ). For example, the temperature characteristic at the detection position D has a positive slope, and the slope is relatively large, but the slope of the temperature characteristic becomes smaller by arranging the voltage detecting portions  20  and  21  at the detection positions A to C. It is also possible to make the slope of the temperature characteristic negative (negative temperature characteristic), as in detection positions A and B. In this manner, the temperature characteristic of the resistance value of the shunt resistor  1  changes depending on the positions of the voltage detecting portions  20  and  21  in the second direction within the detection areas  66  and  67 . 
     In particular, there is an area between the detection positions B and C where the slope (i.e., TCR) of the temperature characteristic of the resistance value of the shunt resistor  1  is almost zero over a wide temperature range. The detection portion C is located 0.5 mm away from the leading end portions  66   c  and  67   c,  and the detection position B is located 1.0 mm away from the leading end portions  66   c  and  67   c.  Therefore, good TCR characteristics can be obtained by arranging the voltage detecting portions  20  and  21  at positions separated by 0.5 mm or more from the leading end portions  66   c  and  67   c.  A distance from the leading end portions  66   c  and  67   c  where the voltage detecting portions  20  and  21  are arranged is preferably 0.5 mm or more and 1.0 mm or less. 
     As described above, the TCR varies depending on the positions of the voltage detecting positions  20  and  21 . In a design and manufacturing process of the shunt resistor  1 , variations in the characteristics of the resistance material itself (the material of the resistance element  5 ) and variations in the application of the resistance material can be corrected by the positions of the voltage detecting positions  20  and  21 . 
     For example, reference positions of the voltage detecting portions  20  and  21  are defined corresponding to the temperature characteristics of a predetermined resistive material. If actual temperature characteristics of the resistive material are observed to be more positive than expected, the voltage detecting portions  20  and  21  are adjusted closer to the terminal end portions (first wall portions  66   b  and  67   b ) closer than the reference position. If the temperature characteristics of the resistive material are observed to be more negative than expected, the voltage detecting portions  20  and  21  are adjusted closer to the leading end portions  66   c  and  67   c.  In this manner, the variations in the characteristics of the resistive material can be corrected by adjusting the positions of the voltage detecting portions  20  and  21 . 
     As described above, in the present embodiment, the desired temperature coefficient of resistance can be satisfied by arranging the voltage detecting portions  20  and  21  at a desired positions with a gap between the leading end portions  66   c  and  67   c  in the detection areas  66  and  67  of the electrodes  6  and  7 , which constitute a portion of the projecting portion  11  of the current detection device  30 . 
       FIGS.  26 A and  26 B  are schematic views showing still another embodiment of the current detection device  30 . Configurations of this embodiment, which will not be particularly described, are the same as those of the embodiments described with reference to  FIGS.  21  to  25   , and redundant descriptions thereof will be omitted. As shown in  FIGS.  26 A and  26 B  the current detection device  30  of this embodiment includes the shunt resistor  1  and the wiring substrate  33 . The wiring substrate  33  includes detection pads  33   a  and  33   b.  A wiring (not shown) for transmitting the voltage signal (voltage of the resistance element  5 ) from the shunt resistor  1  is formed on the wiring substrate  33 , and the detection pads  33   a  and  33   b  are connected to the wiring (not shown). 
     The detection pads  33   a  and  33   b  are metal thin films and are connected to the voltage detecting portions  20  and  21  (not shown in  FIGS.  26 A and  26 B ).  FIG.  26 B  shows as state in which the wiring substrate  33  is connected to the detection areas  66  and  67  by shifting the position of the wiring substrate  33  from  FIG.  26 A  in the second direction (see  FIG.  23   ). In this embodiment, portions on the detection areas  66  and  67  which are connected to the detection pads  33   a  and  33   b  are the voltage detection areas  20  and  21 . 
     As shown in  FIGS.  26 A and  26 B , the positions of the detection pads  33   a  and  33   b  connected to the detection areas  66  and  67  can be adjusted by adjusting a relative position of the shunt resistor  1  and the wiring substrate  33 . In other words, the positions of the voltage detecting portions  20  and  21  can be adjusted by adjusting the relative position of the shunt resistor  1  and the wiring substrate  33 . Therefore, the TCR characteristic can be corrected by adjusting the relative position of the shunt resistor  1  and the wiring substrate  33 . The width of the detection pads  33   a  and  33   b  in the second direction is smaller than t 1 , and is a size that allows the position adjustment. The temperature characteristic of the shunt resistor  1  tends to improve as the widths of the detection pads  33   a  and  33   b  decrease. However, the sizes of the detection pads  33   a  and  33   b  are set in consideration of the bondability and the risk of disconnection. By adjusting the positions of the detection pads  33   a  and  33   b,  it is possible to change the resistance value of the current detection device  30 , which can be applied to a resistance value correction function. 
     A method of aligning the wiring substrate  33  and the shunt resistor  1  is as follows. First, in an initial flow, using a detection probe, an inherent temperature characteristics of the shunt resistor  1  are measured by measuring the resistance value of the shunt resistor  1  at a predetermined detection position at each of two (or three or more) points, a reference temperature of 25° C. (or 20° C.) and a predetermined temperature (e.g., 125° C.). Thereby, a connection position of the wiring substrate  33  is determined. An alignment between the wiring substrate  33  and the shunt resistor  1  can be performed by positioning of image detection or by providing a reference pin on the shunt resistor  1  or a jig to change the position. In this manner, a mechanism that can relatively control initial characteristics and the voltage detection lead position can be configured in the process. 
       FIGS.  27 A and  27 B  are schematic views showing still another embodiment of the current detection device  30 . Configurations of this embodiment, which will not be particularly described, are the same as those of the embodiments described with reference to  FIGS.  21  to  25   , and redundant descriptions thereof will be omitted. As shown in  FIGS.  27 A and  27 B , the current detection device  30  of this embodiment includes the shunt resistor  1  and detection members  72  and  73 . The detection members  72  and  73  are connected to the voltage detecting portions  20  and  21  (not shown in  FIGS.  27 A and  27 B ) of the detection areas  66  and  67 , respectively. 
       FIG.  27 B  shows a state in which the detection members  72  and  73  are connected to the detection areas  66  and  67  by shifting the positions of the detection members  72  and  73  from  FIG.  27 A  in the second direction. In this embodiment, portions above the detection areas  66  and  67  connected to the detection members  72  and  73  are the voltage detecting portions  20  and  21 . Examples of the detection members  72  and  73  include pads made of solder or other metals, pin terminals, lead frames, or the like. 
     As shown in  FIGS.  27 A and  27 B , the positions of the voltage detecting portions  20  and  21  (not shown in  FIGS.  27 A and  27 B ) can be adjusted by adjusting connection positions of the detection members  72  and  73 . Therefore, the TCR characteristics can be corrected by adjusting the positions of the detection members  72  and  73 . The widths of the detection members  72  and  73  in the second direction are smaller than t 1 , and are a size that allows the position adjustment. The temperature characteristic of the shunt resistor  1  tends to improve as the widths of the detection members  72  and  73  decrease. However, the sizes of the detection members  72  and  73  are set in consideration of the bondability and the risk of disconnection. By adjusting the positions of the detection members  72  and  73 , the resistance value of the current detection device  30  can be changed, which can be applied to the resistance value correction function. 
       FIGS.  28 A and  28 B  are views for explaining the positions of the voltage detecting portions  20  and  21 . As described above, when the voltage detecting portions  20  and  21  are arranged at the leading end portions  66   c  and  67   c,  the temperature characteristics of the resistance value of the shunt resistor  1  obtained from the voltage detecting portions  20  and  21  approximate the temperature characteristics of the resistance element  5  itself. Therefore, in this embodiment, the voltage detecting portions  20  and  21  are arranged in the detection areas  66  and  67  avoiding the leading end portions  66   c  and  67   c.    
     In one embodiment, the voltage detecting portion  20  is arranged in a hatched area  75  in  FIG.  28 A . Although not shown, the voltage detecting portion  21  is arranged symmetrically with the voltage detecting portion  20  with respect to the resistance element  5 . Specifically, the voltage detecting portions  20  and  21  are arranged in ¾ area on the terminal side (first wall portions  66   b  and  67   b  sides) of the detection areas  66  and  67  in the second direction. 
     Cu is generally used as the material of the electrodes  6  and  7 . In order to reduce an influence of the temperature characteristics of the resistance value of this electrode material, in one embodiment, as shown in  FIG.  28 B , the voltage detecting portions  20  and  21  may be arranged on the side closer to the resistance element  5  than the center (center line CL) of the detection areas  66  and  67  in the first direction. Specifically, the voltage detecting portion  20  may be arranged in the hatched area  75  in  FIG.  28 B . Although not shown, the voltage detecting portion  21  is arranged symmetrically with the voltage detecting portion  20  with respect to the resistance element  5 . The area  75  in  FIG.  28 B  is ¾ area on the terminal side (first wall portions  66   b  and  67   b  sides) of the detection areas  66  and  67  in the second direction and ½ area of the detection areas  66  and  67  on the resistance element  5  side in the first direction. 
     As described above, the shunt resistor  1  has steps  18  and  19  in this embodiment. Therefore, in one embodiment, a voltage detection member for detecting the voltage of the resistance element  5  may be connected across the steps  18  and  19  (so as to cover the contact surfaces  6   a  and  7   a ). As a result, the influence of the temperature characteristics on the resistance value of the material of the electrodes  6  and  7  can be further reduced, and the voltage generated at the both ends  5   a  and  5   b  of the resistance element  5  can be measured more accurately. Moreover, the steps  18  and  19  can prevent the voltage detection member from coming into contact with the resistance element  5 . 
       FIG.  29    is a schematic view showing an example in which the voltage detection member is connected across steps  18  and  19 . In this embodiment, the current detection device  30  includes the wiring substrate  33  and the shunt resistor  1 . The wiring substrate  33  includes the detection pads  33   a  and  33   b  as the voltage detection members. The detection pads  33   a  and  33   b  are connected to voltage signal wirings  48  and  49  through via holes  52  and  53 , respectively. The detection pads  33   a  and  33   b  are connected to the detection areas  66  and  67  across the steps  18  and  19  (so as to cover the contact surfaces  6   a  and  7   a ). With such a configuration, the inside of the electrodes  6  and  7  can be used as the voltage detecting portions  20  and  21  (not shown in  FIG.  29   ), and the voltage of the resistance element  5  can be measured without being affected by the characteristics of the electrodes  6  and  7 . As a result, the voltage generated at the both ends  5   a  and  5   b  of the resistance element  5  can be measured more accurately in this embodiment. 
     As described above, the resistance element  5  is connected to the electrodes  6  and  7  by means such as welding (e.g., electron beam welding, laser beam welding, or brazing). As a result, unevenness occurs due to welding marks in a joint portion between the resistance element  5  and the electrodes  6  and  7 . However, in the present embodiment, the shunt resistor  1  has the steps  18  and  19 , so that the voltage detection members can be connected across the steps  18  and  19  without being affected by the above weld marks. 
       FIG.  30    is a schematic view showing another embodiment of the projecting portion  11 . It may not be necessary to make the temperature characteristic of the resistance of the shunt resistor  1  have a negative slope. In this case, the length t 1  of the second wall portions  66   a  and  67   a  need not be longer than necessary. Shortening the length t 1  of the second wall portions  66   a  and  67   a  can contribute to downsizing and cost reduction of the shunt resistor  1 . In one embodiment, as shown in  FIG.  30   , the length PW of the first wall portions  66   b  and  67   b  may be longer than the length t 1  of the second wall portions  66   a  and  67   a.  For example, PW:t 1 =4:3 or PW:t 1 =3:2. 
     Further, in one embodiment, as shown in  FIG.  31   , corners of the projecting portion  11  may be rounded. Also in this embodiment, a ratio of t 1  and PW may be the same as in the embodiment of  FIG.  30   . Furthermore, in one embodiment, the corners of the projecting portion  11  may be C-planes. Also in this case, the ratio of t 1  and PW may be the same as in the embodiment of  FIG.  30   . 
       FIG.  32    is a schematic view showing still another embodiment of the current detection device  30 . Configurations of this embodiment, which will not be particularly described, are the same as those of the embodiments described with reference to  FIGS.  21  to  31   , and redundant descriptions thereof will be omitted. In this embodiment, the current detection device  30  also includes the shunt resistor  1 . In other words, the current detection device  30  of this embodiment is the shunt resistor  1  itself. In this embodiment, slits  76  and  77  are formed in the electrodes  6  and  7 . In this embodiment, the shunt resistor  1  does not have recessed portion  12 . Specifically, the slits  76  and  77  extend from the sides  6   c  and  7   c  toward the inside of the electrodes  6  and  7  (in the second direction (see  FIG.  21   )). In this embodiment, the projecting portion  11  is formed by the slits  76  and  77 .  FIGS.  26 A to  31    can also be applied to this embodiment, and the effects described with reference to  FIGS.  21  to  31    can be obtained. 
     The previous description of embodiments is provided to enable a person skilled in the art to make and use the present invention. Moreover, various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles and specific examples defined herein may be applied to other embodiments. Therefore, the present invention is not intended to be limited to the embodiments described herein but is to be accorded the widest scope as defined by limitation of the claims. 
     INDUSTRIAL APPLICABILITY 
     The present invention is applicable to a current detection device, particularly the current detection device using the shunt resistor. 
     REFERENCE SIGNS LIST 
       1  shunt resistor 
       1 A first shunt resistor 
       1 B second shunt resistor 
       1   a,    1   b  side surface 
       5  resistance element 
       5   a,    5   b  both ends (both connecting surfaces) 
       5   c,    5   d  side surface 
       5   e  surface 
       6 ,  7  electrode 
       6   a,    7   a  contact surface 
       6   b,    6   c,    6   d  side surface 
       7   b,    7   c,    7   d  side surface 
       6   e,    7   e  surface 
       6   f,    7   f  body 
       8 ,  9  bolt hole 
       11  projecting portion 
       11   a,    11   b  side surface 
       12  recessed portion 
       12   a,    12   b,    12   c  side surface 
       14  portion 
       16 ,  17  voltage detecting position 
       18 ,  19  step 
       20 ,  21  voltage detecting portion 
       20   a,    21   a  cut portion 
       25  cut portion 
       30  current detection device 
       31  voltage output device 
       32  case 
       33  wiring substrate 
       33   a,    33   b  detection pad 
       34  current detection circuit substrate 
       35  output terminal 
       36 ,  37  voltage terminal pad 
       38 ,  39  voltage detection terminal 
       46 ,  47  voltage signal wiring 
       48 ,  49  voltage signal wiring 
       50  ground wiring 
       52 ,  53  via hole 
       60  shunt resistor base material 
       66 ,  67  detection area 
       66   a,    67   a  second wall portion 
       66   b,    67   b  first wall portion 
       66   c,    67   c  leading end portion 
       72 ,  73  detection member 
       75  area 
       76 ,  77  slit 
       100  shunt resistor 
       105  resistance element 
       106 ,  107  electrode 
       108 ,  109  bolt hole 
       120 ,  121  voltage detecting portion 
       200  shunt resistor 
       205  resistance element 
       206 ,  207  electrode 
       211  projecting portion 
       220 ,  221  voltage detecting portion