JP2012160552A - Shunt resistor and power supply device equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shunt resistor with an improved mounting property capable of precisely measuring a current flowing in a battery cell, and a power supply device equipped with the shunt resistor.SOLUTION: A first bus bar 41 is connected to a plus electrode 10a of one battery cell 10 and a minus electrode 10b of the other battery cell 10, and comprises a base part 50 and a pair of mounting pieces 43. Electrode connection holes 44a, 44b, in which the plus electrode 10a of one battery cell 10 and the minus electrode 10b of the other battery cell 10 can be inserted respectively, are formed on the base part 50. On the base part 50, a current flow in a region AR between the electrode connection holes 44a, 44b is blocked by a gap 54 between one terminal part 51 and the other terminal part 52, and a current path bypassing the region between the electrode connection holes 44a, 44b is formed. A pair of mounting pieces 43 are spaced from each other in the current path formed on the base part 50.

Description

  The present invention relates to a shunt resistor and a power supply device including the same.

  A power supply device capable of charging and discharging is used as a driving source for a moving body such as an electric vehicle. Such a power supply device has, for example, a configuration in which a plurality of batteries (battery cells) are connected in series or in parallel. A user of a mobile object equipped with a power supply device needs to grasp the remaining amount (charge amount) of each battery capacity. Moreover, when charging / discharging the power supply device, it is necessary to prevent overcharge and overdischarge of each battery. Therefore, it is necessary to detect the current flowing through the plurality of batteries as the state of the power supply device.

JP 2004-117045 A

  A shunt resistor is used to measure the current flowing through the electronic circuit. For example, Patent Document 1 describes a shunt resistor for measuring a current flowing in an actuator mounted on an automobile. The shunt resistor of Patent Document 1 is formed of a metal plate and includes a rectangular resistance portion, two current terminal portions, and two voltage terminal portions.

  The two current terminal portions of the shunt resistor are connected to the power board. The resistance portion of the shunt resistor is connected in series to the actuator via the two current terminal portions and the power board. On the other hand, the two voltage terminal portions of the shunt resistor are connected to the control circuit board. The control circuit board indirectly measures the current flowing through the actuator by measuring the potential difference between the two voltage terminal portions.

  When such a shunt resistor is provided in the power supply device, it is necessary to connect the shunt resistor to the power board and the control circuit board, and to provide the power board and the control circuit board to which the shunt resistor is connected to the power supply device. There is. In this case, the work of attaching the shunt resistor to the power supply device becomes complicated.

  An object of the present invention is to provide a shunt resistor capable of accurately measuring a current flowing through a battery cell and having improved mountability, and a power supply device including the shunt resistor.

  (1) A shunt resistor according to a first invention is a shunt resistor connected to a first terminal and a second terminal, wherein the first and second terminals can be inserted respectively. A conductive member having a second terminal hole; and first and second terminal portions, the conductive member blocking current flow in a region between the first and second terminal holes. A first current regulating portion that regulates a current so as to form a current path that bypasses a region between the first and second terminal holes; and the first and second terminal portions are electrically conductive members The current paths to be formed are provided at intervals.

  By inserting the first and second terminals into the first and second terminal holes of the shunt resistor, respectively, the shunt resistor can be easily attached to the first and second terminals. In this state, a current can be passed between the first terminal and the second terminal through the conductive member. In this case, the current path in the region between the first and second terminal holes is blocked by the first current regulating portion of the conductive member, and the current path bypasses the region between the first and second terminal holes. Is formed.

  The current distribution in the current path that bypasses the region between the first and second terminal holes hardly changes even if the first and second terminals inserted in the first and second terminal holes are misaligned. . Therefore, the resistance value of the current path is constant regardless of the positional deviation of the first and second terminals inserted into the first and second terminal holes. Therefore, the current flowing through the shunt resistor can be accurately measured by detecting the voltage between the first and second terminal portions provided in the current path.

  As a result, the current flowing between the first terminal and the second terminal is accurately measured, and attachment to the first terminal and the second terminal is sufficiently improved.

  (2) The conductive member has first and second sides facing each other, the first and second terminal holes are provided so as to be aligned in a direction parallel to the first side, and the current path is the first The first and second terminal portions are provided on the first side, and the first current regulating portion is a current path from the second side toward the first side. It may extend to.

  In this case, after the current from one of the first and second terminals flows toward the first side in the conductive member, and further flows along the first side, the current from the first side to the other side It flows toward the terminal.

  In this way, since the current path is formed along the first side, the voltage between two positions in the current path can be easily detected by the first and second terminal portions provided on the first side. can do.

  (3) The conductive member includes a region extending from the first current regulating portion to a position between the first terminal hole and the first side, and the second terminal hole and the first from the first current regulating portion. You may further have the 2nd electric current control part which suppresses the flow of the electric current in the area | region extended to the position between edge | sides.

  In this case, the current from one of the first and second terminal portions bypasses the second current regulating portion at a position between the first terminal hole and the first side in the conductive member. To the first side, and further along the first side, the second current restricting portion is moved from the first side to the second terminal hole and the first side. It flows toward the other terminal to make a detour.

  In this way, the current path formed along the first side can be lengthened. Thereby, the distance between the first and second terminal portions can be set large enough to enable voltage detection. As a result, the voltage between two positions in the current path can be detected more accurately by the first and second terminal portions.

  (4) The first current regulating portion has a width in a direction parallel to the first side, and the inner edges of the first and second terminal portions are located within the width of the first current regulating portion. May be.

  A current path portion between the first current regulating portion and the first side has a length corresponding to the width of the first current regulating portion. The current distribution in the current path portion does not change even if the first and second terminals inserted into the first and second terminal holes are displaced. Therefore, the resistance value of the current path portion between the first current regulating portion and the first side is independent of the positional deviation of the first and second terminals inserted into the first and second terminal holes. Is constant.

  Since the inner edges of the first and second terminal portions are located within the width of the first current regulating portion, the current has a constant resistance value regardless of the displacement of the first and second terminals. The voltage between the two positions of the path part can be detected accurately. Thereby, the current flowing through the shunt resistor can be accurately measured based on the detected voltage and the resistance value between the two positions of the current path portion.

  (5) The first current regulating portion may be a notch that extends from the second side of the conductive member to the current path toward the first side.

  In this case, the flow of current in the region between the first and second terminal holes is reliably prevented by the notch. Therefore, a current path that bypasses the region between the first and second terminal holes can be more reliably formed.

  (6) A power supply device according to a second invention includes a battery cell and a shunt resistor according to the first invention for measuring a current flowing through the battery cell.

  In the power supply device, the first and second terminals are inserted into the first and second terminal holes of the shunt resistor, so that the shunt resistor can be easily attached to the first terminal and the second terminal. It is done. In this state, a current from the battery cell flows through the shunt resistor via the first terminal and the second terminal. According to the shunt resistor according to the first invention, the current flowing through the shunt resistor can be accurately measured by detecting the voltage between the first and second terminal portions. Therefore, the reliability of the power supply device is improved and the assembly of the power supply device is facilitated.

  (7) A plurality of battery cells are provided, and an electrode terminal of one of the plurality of battery cells is inserted as a first terminal into the first terminal hole of the shunt resistor, and the second shunt resistor An electrode terminal of another battery cell is inserted as a second terminal into the terminal hole, and current from a plurality of battery cells may flow through the shunt resistor via the first terminal and the second terminal.

  In this case, an electrode terminal of one battery cell among the plurality of battery cells is inserted as a first terminal into the first terminal hole of the shunt resistor, and another battery cell is inserted into the second terminal hole of the shunt resistor. By inserting the electrode terminal as the second terminal, the shunt resistor can be easily attached to the first terminal and the second terminal. In this state, current from the plurality of battery cells flows through the shunt resistor through the first terminal and the second terminal.

  In this case, the shunt resistor is directly connected between the two electrode terminals of the plurality of battery cells. Therefore, it is not necessary to provide another terminal for attaching the shunt resistor to the power supply device. As a result, the configuration of the power supply device is simplified and the increase in size of the power supply device is suppressed.

  According to the present invention, it is possible to accurately measure the current flowing through the battery cell, and improve the mountability of the shunt resistor.

It is a top view which shows the structure of the power supply device which concerns on one embodiment of this invention. It is an external appearance perspective view of a 1st bus bar. It is a top view of the 1st bus bar. It is a figure for demonstrating the effect by a 1st bus bar. It is a top view which shows the 1st modification of a 1st bus bar. It is a top view which shows the 2nd modification of a 1st bus bar. It is a top view which shows the 3rd modification of a 1st bus bar. It is a top view which shows the 4th modification of a 1st bus bar. It is a top view which shows the 5th modification of a 1st bus bar. It is a top view which shows the 6th modification of a 1st bus bar. It is a top view which shows the more preferable dimension of the 1st bus bar which concerns on a 6th modification. It is a top view which shows the 7th modification of a 1st bus bar. It is a figure which shows the 8th modification of a 1st bus bar. It is a top view which shows the 9th modification of a 1st bus bar. It is a top view showing the 10th modification of the 1st bus bar. It is a figure for demonstrating the dispersion | variation evaluation test of the resistance value by an attachment error. It is a graph which shows the dispersion | variation evaluation test result of the resistance value by an attachment error. It is a top view which shows the bus-bar which concerns on Example 3,4,5.

  Hereinafter, a shunt resistor and a power supply device including the same according to an embodiment of the present invention will be described with reference to the drawings. The power supply device according to the present embodiment is mounted on an electric vehicle (for example, an electric automobile) that uses electric power as a drive source.

(1) Power Supply Device FIG. 1 is a plan view showing a configuration of a power supply device according to an embodiment of the present invention. In FIG. 1, as indicated by arrows X, Y, and Z, three directions orthogonal to each other are defined as an X direction, a Y direction, and a Z direction. In this example, the X direction and the Y direction are directions parallel to the horizontal plane, and the Z direction is a direction orthogonal to the horizontal plane. Further, the upward direction is the direction in which the arrow Z faces.

  As shown in FIG. 1, in the power supply device 100, a plurality of (six in this example) battery cells 10 having a flat, substantially rectangular parallelepiped shape are stacked in the X direction. Each battery cell 10 is a secondary battery such as a lithium ion battery or a nickel metal hydride battery. The plurality of battery cells 10 are disposed between the pair of end plates 92a and 92b. The pair of end plates 92a and 92b has a flat and substantially rectangular parallelepiped shape, and is arranged in parallel to the YZ plane.

  Each end plate 92a, 92b has one surface facing the adjacent battery cell 10 and the other surface opposite to the adjacent battery cell 10 and an upper surface parallel to the XY plane. A connecting portion for connecting one end portions of the pair of side fixing members 93 is formed in the vicinity of both end portions in the Y direction on the other surface of the one end plate 92a. Similarly, connection portions for connecting the other end portions of the pair of side portion fixing members 93 are formed in the vicinity of both end portions in the Y direction on the other surface of the other end plate 92b. The pair of side fixing members 93 are arranged so as to extend in the X direction. The end plates 92a and 92b and the side fixing member 93 used in the present embodiment are formed of an insulating resin.

  In a state where the plurality of battery cells 10 are disposed between the pair of end plates 92a and 92b, the pair of side fixing members 93 are attached to the connecting portions of the pair of end plates 92a and 92b using screws 94. Thereby, the some battery cell 10 is fixed integrally in the state arrange | positioned so that it may rank with a X direction.

  Each battery cell 10 has a plus electrode 10a and a minus electrode 10b on the upper surface portion so as to be aligned along the Y direction. Each electrode 10a, 10b has a cylindrical shape and is provided so as to protrude upward.

  In the following description, the battery cells 10 adjacent to one end plate 92a to the battery cells 10 adjacent to the other end plate 92b are referred to as the first to sixth battery cells 10.

  Each battery cell 10 is arranged so that the positional relationship between the positive electrode 10a and the negative electrode 10b in the Y direction is opposite between adjacent battery cells 10. Further, one of the plus electrodes 10a and the minus electrodes 10b of the plurality of battery cells 10 is arranged in a line along the X direction, and the other of the plus electrodes 10a and the minus electrodes 10b of the plurality of battery cells 10 is arranged along the X direction. Line up in a row. Thereby, between the adjacent battery cells 10, the positive electrode 10 a of one battery cell 10 and the negative electrode 10 b of the other battery cell 10 are adjacent to each other, and the negative electrode 10 b of one battery cell 10 and the other battery cell 10 are adjacent to each other. Next to the positive electrode 10a. In this state, the bus bar 40 in which two electrode connection holes are formed in two adjacent electrodes is attached. Thereby, the some battery cell 10 is connected in series.

  Specifically, a common bus bar 40 is attached to the plus electrode 10 a of the first battery cell 10 and the minus electrode 10 b of the second battery cell 10. A common bus bar 40 is attached to the plus electrode 10 a of the second battery cell 10 and the minus electrode 10 b of the third battery cell 10. Similarly, a common bus bar 40 is attached to the plus electrode 10a of each odd-numbered battery cell 10 and the minus electrode 10b of the even-numbered battery cell 10 adjacent thereto. A common bus bar 40 is attached to the plus electrode 10a of each even-numbered battery cell 10 and the minus electrode 10b of the odd-numbered battery cell 10 adjacent thereto. The bus bar 40 is not attached to the negative electrode 10 b of the first battery cell 10 and the positive electrode 10 a of the sixth battery cell 10.

  Male screws are formed on the positive electrode 10 a and the negative electrode 10 b of each battery cell 10. Adjacent plus electrode 10a and minus electrode 10b are fitted into two electrode connection holes formed in each bus bar 40, respectively. In this state, the nut Na is attached to the male threads of the plus electrode 10a and the minus electrode 10b.

  The negative electrode 10 b of the first battery cell 10 adjacent to one end plate 92 a has the lowest potential in the power supply device 100. The positive electrode 10 a of the sixth battery cell 10 adjacent to the other end plate 92 b has the highest potential in the power supply device 100.

  A terminal 501 t provided at one end of the power supply line 501 is connected to the negative electrode 10 b of the first battery cell 10. Specifically, the negative electrode 10b of the first battery cell 10 is fitted into the electrode connection hole formed in the terminal 501t of the power supply line 501. In this state, the nut Na is attached to the male screw of the negative electrode 10b.

  Similarly, a terminal 501 t provided at one end of the power supply line 501 is also connected to the plus electrode 10 a of the sixth battery cell 10. Specifically, the plus electrode 10 a of the sixth battery cell 10 is fitted into the electrode connection hole formed in the terminal 501 t of the power supply line 501. In this state, the nut Na is attached to the male screw of the positive electrode 10a.

  The other ends of the two power lines 501 connected to the first battery cell 10 and the sixth battery cell 10 are connected to the load 200. Thereby, it becomes possible to supply the power of the plurality of battery cells 10 to the load 200 and to charge the plurality of battery cells 10 based on the regenerative power generated by the load 200.

  In the present embodiment, the plurality of bus bars 40 used in the power supply device 100 includes two types of bus bars 41 and 42. The shapes and materials of the two types of bus bars 41 and 42 are different from each other. In the following description, the bus bars 41 and 42 are respectively referred to as a first bus bar 41 and a second bus bar 42 so that the two types of bus bars 41 and 42 can be easily distinguished.

  In the example of FIG. 1, the first bus bar 41 is used as the bus bar 40 that connects the plus electrode 10 a of the second battery cell 10 and the minus electrode 10 b of the third battery cell 10 among the plurality of bus bars 40. As the plurality of other bus bars 40, the second bus bar 42 is used.

  The second bus bar 42 is made of a substantially elliptical metal plate extending in the X direction. The second bus bar 42 has, for example, a structure in which nickel plating is applied to the surface of tough pitch copper.

  The first bus bar 41 has two attachment pieces 43 described later. One end of each conductor wire 111 is connected to the two attachment pieces 43 of the first bus bar 41 by soldering. The other ends of the two conductor wires 111 are connected to the current detection unit 110.

  The current detection unit 110 includes, for example, a CPU (Central Processing Unit) and a memory. In the memory of the current detection unit 110, a resistance value of a shunt resistor RS (described later, see FIGS. 2 and 3) between the two attachment pieces 43 in the first bus bar 41 is stored in advance.

  The current detection unit 110 detects the voltage between the two attachment pieces 43 in the first bus bar 41. Further, the current detection unit 110 calculates the value of the current flowing through the first bus bar 41 by dividing the detected voltage between the two attachment pieces 43 by the resistance value of the shunt resistor RS stored in the memory. In this way, the value of the current flowing between the plurality of battery cells 10 is detected. The detected current value is output to an external device such as a main control unit of the electric vehicle.

(2) Details of First Bus Bar FIG. 2 is an external perspective view of the first bus bar 41, and FIG. 3 is a plan view of the first bus bar 41. As shown in FIGS. 2 and 3, the first bus bar 41 includes a base portion 50 and two attachment pieces 43. The base portion 50 and the pair of attachment pieces 43 of the first bus bar 41 have a configuration in which nickel plating is applied to the surface of, for example, a copper manganese alloy or a copper nickel alloy, and is integrally formed by, for example, pressing.

  The base portion 50 includes a substantially rectangular one terminal portion 51, a substantially rectangular other terminal portion 52, and a rectangular connecting portion 53. On the other hand, the terminal portion 51 has a pair of long sides 51a and 51b facing each other and a pair of short sides 51c and 51d facing each other. The other terminal portion 52 has a pair of long sides 52a and 52b facing each other and a pair of short sides 52c and 52d facing each other. The connecting portion 53 connects the one terminal portion 51 and the other terminal portion 52 so that the long side 51b of the one terminal portion 51 and the long side 52b of the other terminal portion 52 are parallel and face each other. The connecting portion 53 has long sides 53L and 53M that face each other. The long side 53M of the connecting portion 53 extends on the same straight line as the short side 51d of the one terminal portion 51 and the short side 52d of the other terminal portion 52. The long side 53L of the connecting portion 53 is perpendicular to the long side 51b and the long side 52b so that a gap 54 is formed between the long side 51b of the one terminal portion 51 and the long side 52b of the other terminal portion 52. Extend. In the example of FIG. 3, the short side 51 c of the one terminal part 51 and the short side 52 c of the other terminal part 52 are curved so that the center part protrudes, but the short side 51 c of the one terminal part 51 and the other terminal The short side 52c of the part 52 may be formed linearly.

  On the other hand, a substantially perfect electrode connection hole 44 a is formed at a substantially central portion of the terminal portion 51. On the other hand, an ellipse electrode connection hole 44b having a long axis parallel to the short sides 52c and 52d is formed at a substantially central portion of the other terminal portion 52.

  On the other hand, the terminal portion 51 is formed with a slit 51s extending from the long side 51b to a region between the electrode connection hole 44a and the short side 51d. The slit 51 s is provided perpendicular to the long side 51 b of the one terminal portion 51 so as to be positioned on the same straight line as the long side 53 </ b> L of the connecting portion 53. The slit 51s may not be formed.

  The other terminal portion 52 is formed with a slit 52s extending from the long side 52b to a region between the electrode connection hole 44b and the short side 52d. The slit 52s is provided perpendicular to the long side 52b of the other terminal portion 52 so as to be positioned on the same straight line as the long side 53L of the connecting portion 53. The slit 52s may not be formed.

  One attachment piece 43 is provided on the base portion 50 so as to protrude from the short side 51d of the one terminal portion 51 along the extended line of the long side 51b. The other attachment piece 43 is provided on the base portion 50 so as to protrude from the short side 52d of the other terminal portion 52 along the extended line of the long side 52b. Each attachment piece 43 has a narrow portion 43a and a wide portion 43b. On the other hand, in the direction of the short side 51d of the terminal portion 51 and the short side 52d of the other terminal portion 52, the length of the narrow portion 43a is shorter than the length of the wide portion 43b. The narrow portion 43 a of one attachment piece 43 is formed so as to connect the wide portion 43 b and the one terminal portion 51. The narrow portion 43 a of the other mounting piece 43 is formed so as to connect the wide portion 43 b and the other terminal portion 52. Each attachment piece 43 does not need to have the narrow part 43a and the wide part 43b. That is, each attachment piece 43 may have a certain length in the direction of the short side 51 d of the one terminal portion 51 and the short side 52 d of the other terminal portion 52.

  The dimension of each part of the 1st bus bar 41 is defined as follows, for example. In the following description, the direction parallel to the short side 51d of the one terminal portion 51 and the short side 52d of the other terminal portion 52 is referred to as the X direction, and the long sides 51a and 51b of the one terminal portion 51 and the long side of the other terminal portion 52 are called. A direction parallel to 52a and 52b is referred to as a Y direction.

  The distance a between the center of the electrode connection hole 44a and the center of the electrode connection hole 44b is between the centers of the adjacent plus electrode 10a and the minus electrode 10b of the two battery cells 10 adjacent to each other in the power supply device 100 of FIG. Set equal to distance.

  The length b of the base portion 50 in the X direction is set to be not less than 1.8 times and not more than 2.0 times the distance a. Further, the length c of the base portion 50 in the Y direction is set to be 1.0 to 2.0 times the distance a.

  The inner diameter d of the electrode connection holes 44a and 44b in the Y direction is set to a value obtained by adding play to the outer diameters of the positive electrode 10a and the negative electrode 10b of the battery cell 10 in FIG.

  The length e of the gap 54 between the one terminal portion 51 and the other terminal portion 52 in the Y direction is set to be larger than the inner diameter d of the electrode connection holes 44a and 44b in the Y direction. The gap 54 is formed so as to cross the area AR between the electrode connection holes 44a and 44b. The length f of the connecting portion 53 in the Y direction is represented by the difference (ce) between the length c of the base portion 50 and the length e of the gap 54.

  The distance h between the two attachment pieces 43 in the X direction is set to be smaller than the distance g between the electrode connection hole 44a and the electrode connection hole 44b. The distance g between the electrode connection hole 44a and the electrode connection hole 44b represents the minimum value of the distance between the inner peripheral surface of the electrode connection hole 44a and the inner peripheral surface of the electrode connection hole 44b in the X direction. When the opposing sides of the two attachment pieces 43 are not straight and parallel, the distance h between the two attachment pieces 43 represents the minimum value of the distance between the two attachment pieces 43 in the X direction.

  The distance h between the two attachment pieces 43 in the X direction is equal to the width j of the gap 54 in the X direction (the distance between the long side 51b of the one terminal portion 51 and the long side 52b of the other terminal portion 52).

  In the first bus bar 41, the region of the connecting portion 53, the region between the narrow portion 43a of one attachment piece 43 and the slit 51s, and the narrow portion 43a of the other attachment piece 43 and the slit 52s. A resistance formed in a region between the centers of the two narrow portions 43a of the two attachment pieces 43 in the X direction in the region between them is used as the shunt resistor RS for current detection.

  A distance a between the center of the electrode connection hole 44a and the center of the electrode connection hole 44b is, for example, not less than 10 mm and not more than 20 mm. In this case, the thickness of the base part 50 is set to 0.5 mm or more and 2.0 mm or less, for example. In addition, the length i between the tip of the slit 51s in the X direction and the narrow portion 43a on the one terminal portion 51 side, and the width of the tip of the slit 52s in the X direction and the narrow portion 43a on the other terminal portion 52 side The length i between is set to 1.0 mm or more and 4.0 mm or less, for example. Further, the length f of the connecting portion 53 in the Y direction is set to, for example, 4.0 mm or more and 6.0 mm or less. The distance L between the centers of the two narrow portions 43a of the two attachment pieces 43 is set to, for example, 4.0 mm or more and 7.0 mm or less.

  For example, the resistance value of the shunt resistor RS is R, the resistivity of the material of the first bus bar 41 is σ, and the sectional area of the shunt resistor RS (in this example, the sectional area of the connecting portion 53 in the X direction). ) Can be expressed by the following formula (1).

R≈σ × L / S (1)
The cross-sectional area S is obtained by multiplying the length f of the connecting portion 53 in the Y direction by the thickness of the base portion 50. The resistivity of the copper manganese alloy is about 0.45 μΩm or more and 0.47 μΩm or less. Therefore, when the first bus bar 41 is made of a copper manganese alloy, the resistivity of the first bus bar 41 is set to 0.46 μΩm, for example.

  In this case, the distance L between the center portions of the two narrow portions 43a is set to 5.0 mm, the length f of the connecting portion 53 in the Y direction is set to 4.0 mm, and the thickness of the base portion 50 is 1. When set to 0 mm, the resistance value R of the shunt resistor RS is about 0.58 mΩ.

  The positive electrode 10a of the second battery cell 10 of FIG. 1 is attached to the electrode connection hole 44a of the first bus bar 41, and the negative electrode 10b of the third battery cell 10 of FIG. 1 is attached to the electrode connection hole 44b of the first bus bar 41. A current flows between the load 200 and the plurality of battery cells 10 in a state where is attached.

  In this case, as shown by a thick arrow in FIG. 3, in the first bus bar 41, the connecting portion 53 is bypassed between the one terminal portion 51 and the other terminal portion 52 while bypassing the gap 54 and the two slits 51s and 52s. A current path cf is formed so as to pass through.

(3) Effects (3-1) In the first bus bar 41 according to the present embodiment, the adjacent plus electrode 10a and minus electrode 10b are fitted into the two electrode connection holes 44a and 44b, respectively. In this state, the nut Na is attached to the male threads of the plus electrode 10a and the minus electrode 10b. Thus, the 1st bus-bar 41 is easily attached between the plus electrode 10a and the minus electrode 10b which adjoin.

  (3-2) In the power supply device 100 of FIG. 1, the voltage between the two attachment pieces 43 of the first bus bar 41 is detected by the current detection unit 110, and based on the detected voltage and the value of the shunt resistor RS. The value of the current flowing through one bus bar 41 is calculated.

  Therefore, the resistance value of the shunt resistor RS stored in the current detection unit 110 and the actual resistance value of the shunt resistor RS between the two attachment pieces 43 when the first bus bar 41 is attached between the two battery cells 10 If they are different from each other, the value of the current flowing through the first bus bar 41 cannot be accurately calculated.

  FIG. 4 is a diagram for explaining the effect of the first bus bar 41. FIG. 4A shows a plan view of the first bus bar 41 provided between two adjacent battery cells 10, and FIG. 4B shows a later-described first bus bar 10 provided between two adjacent battery cells 10. A plan view of the three bus bars 49 is shown. In FIG. 4A and FIG. 4B, illustration of the nut Na in FIG. 1 is omitted.

  As shown in FIG. 4A, in each battery cell 10, substantially rectangular support members 10s and 10t are provided at the lower ends of the plus electrode 10a and the minus electrode 10b, respectively. The support members 10s and 10t are made of the same material as the plus electrode 10a and the minus electrode 10b, and support the first bus bar 41.

  Thereby, in the 1st bus-bar 41, one battery cell 10 passes through the contact part of the inner peripheral surface of the electrode connection hole 44a, and the outer peripheral surface of the plus electrode 10a, and the overlapping part of the one terminal part 51 and the supporting member 10s. Current flows into the one terminal portion 51 from the positive electrode 10a. On the other hand, the current flowing into the terminal portion 51 flows from the one terminal portion 51 toward the short side 51d so as to bypass the tip of the slit 51s, and then flows into the connecting portion 53 along the short side 51d. The current flowing into the connecting portion 53 flows along the short side 52d and flows into the other terminal portion 52 so as to bypass the tip portion of the slit 52s. The current flowing into the other terminal portion 52 passes through the contact portion between the inner peripheral surface of the electrode connection hole 44b and the outer peripheral surface of the negative electrode 10b and through the overlapping portion between the other terminal portion 52 and the support member 10t, and the other battery cell 10. The negative electrode 10b flows out.

  At the time of assembling the power supply device 100, the positions of the plus electrode 10a and the minus electrode 10b may deviate from the design positions due to manufacturing errors of the battery cells 10 or assembly errors of the plurality of battery cells 10. Thereby, the distance s between the support member 10s of one battery cell 10 and the support member 10t of the other battery cell 10 may vary.

  Even in such a case, in the first bus bar 41, a current flows through the connecting portion 53 while bypassing the gap 54 and the two slits 51s and 52s as described above. In the X direction, the two attachment pieces 43 are located between the tip of the slit 51s and the tip of the slit 52s. Therefore, the region through which current flows between the two attachment pieces 43 hardly changes and the current distribution hardly changes. Therefore, the resistance value between the two attachment pieces 43 is also constant regardless of the positional deviation. Thereby, the resistance value of the shunt resistor RS stored in the current detection unit 110 and the actual resistance value of the shunt resistor RS are equal to each other. As a result, the value of the current flowing through the first bus bar 41 can be accurately measured.

  In contrast, for example, a bus bar (hereinafter referred to as a third bus bar) 49 having the same structure as the first bus bar 41 is assumed except that the gap 54 and the slits 51 s and 52 s are not formed.

  As shown in FIG. 4B, in the third bus bar 49, the long side 51 b of the one terminal portion 51 and the long side 52 b of the other terminal portion 52 are integrally joined, and a connecting portion 53 is provided. Not.

  In the third bus bar 49, the current flowing from the positive electrode 10a of one battery cell 10 into the one terminal portion 51 flows into the other terminal portion 52 mainly through the region AR between the electrode connection holes 44a and 44b. Therefore, if the distance s between the support member 10s of one battery cell 10 and the support member 10t of the other battery cell 10 varies due to a manufacturing error of the battery cell 10 or an assembly error of the plurality of battery cells 10, the two The region where current flows between the mounting pieces 43 also varies, and the current distribution changes. Therefore, even when the resistance value between the two mounting pieces 43 is determined in advance, there may be a shift between the predetermined resistance value and the actual resistance value due to the positional shift. Therefore, it is difficult to accurately measure the value of the current flowing through the third bus bar 49.

  (3-3) In the present embodiment, one attachment piece 43 is provided on the base portion 50 so as to protrude from the short side 51 d of the one terminal portion 51, and the other attachment piece 43 is the short side of the other terminal portion 52. It is provided in the base part 50 so that it may protrude from 52d. Thus, since the two attachment pieces 43 are provided on the extended line of the long side 53M of the connecting portion 53 constituting the current path cf, the voltage between the two positions in the current path cf is easily provided by the two attachment pieces 43. Can be detected.

  (3-4) As described above, the one terminal portion 51 is formed with the slit 51s extending from the long side 51b to the region between the electrode connection hole 44a and the short side 51d. The other terminal portion 52 is formed with a slit 52s extending from the long side 52b to a region between the electrode connection hole 44b and the short side 52d. In this case, the current flowing into the one terminal portion 51 flows from the one terminal portion 51 toward the short side 51d so as to bypass the tip end portion of the slit 51s, and then flows into the connecting portion 53 along the short side 51d. The current flowing into the connecting portion 53 flows along the short side 52d and flows into the other terminal portion 52 so as to bypass the tip portion of the slit 52s.

  As described above, in the first bus bar 41 of FIG. 3, the slits 51 s and 52 s are formed, whereby the short side 51 d of the one terminal portion 51, the long side 53 M of the connecting portion 53 and the short side 52 d of the other terminal portion 52. The current path formed along the line can be lengthened. Thereby, the distance between the two attachment pieces 43 can be set large enough to detect the voltage. As a result, the voltage between two positions in the current path cf can be easily detected by the two attachment pieces 43.

  (3-5) As described above, when the distance h between the two attachment pieces 43 in the X direction is equal to the width j of the gap 54 in the X direction, the connection portion 53 that forms the current path cf by the two attachment pieces 43. It is possible to accurately detect the voltage between both ends of the. Therefore, the current flowing through the first bus bar 41 can be accurately measured by the two attachment pieces 43.

(4) Modified Example of First Bus Bar In power supply device 100 according to the present embodiment, a first bus bar described below can be used instead of first bus bar 41 in FIGS. 2 and 3.

  FIG. 5 is a plan view showing a first modification of the first bus bar. In the first bus bar 411 according to the first modification, the slits 51 s are provided on the long side 51 b of the one terminal portion 51 so as to be gradually separated from the same straight line as the long side 53 </ b> L of the connecting portion 53. . Further, the slits 52 s are provided on the long side 52 b of the other terminal portion 52 so as to be gradually separated from the same straight line as the long side 53 </ b> L of the connecting portion 53.

  FIG. 6 is a plan view showing a second modification of the first bus bar. In the first bus bar 412 according to the second modification, the slits 51 s are provided on the long side 51 b of the one terminal portion 51 so as to gradually approach the same straight line as the long side 53 </ b> L of the connecting portion 53. In addition, the slits 52 s are provided on the long side 52 b of the one terminal portion 52 so as to gradually approach the same straight line as the long side 53 </ b> L of the connecting portion 53.

  FIG. 7 is a plan view showing a third modification of the first bus bar. In the first bus bar 413 according to the third modification, instead of the slit 51s in FIGS. 2 and 3, the one terminal portion 51 extends from the long side 51b to the region between the electrode connection hole 44a and the short side 51d. A rectangular cutout 51t is formed. The notch 51t is formed by straight sides t1, t2, and t3. The side t1 extends on the same straight line as the long side 53L of the connecting portion 53. The side t2 faces the side t1 and extends parallel to the side t1 from the long side 51b. The side t3 is perpendicular to the sides t1 and t2, and connects the tip of the side t1 and the tip of the side t2.

  2 and 3, a rectangular cutout 52t extending from the long side 52b to the region between the electrode connection hole 44b and the short side 52d is formed in the other terminal portion 52. The notch 52t is formed by straight sides t11, t12, t13. The side t11 extends on the same straight line as the long side 53L of the connecting portion 53. The side t12 faces the side t1 and extends parallel to the side t1 from the long side 52b. The side t13 is perpendicular to the sides t11 and t12, and connects the tip of the side t11 and the tip of the side t12.

  FIG. 8 is a plan view showing a fourth modification of the first bus bar. In the first bus bar 414 according to the fourth modification, instead of the slit 51s in FIGS. 2 and 3, the one terminal portion 51 extends from the long side 51b to the region between the electrode connection hole 44a and the short side 51d. A triangular cutout 51u is formed. The notch 51u is formed by straight sides u1 and u2. The side u1 extends on the same straight line as the long side 53L of the connecting portion 53. The side u2 extends from the approximate center of the long side 51b toward the tip of the side u1.

  Further, instead of the slit 52s of FIGS. 2 and 3, a triangular cutout 52u extending from the long side 52b to the region between the electrode connection hole 44b and the short side 52d is formed in the other terminal portion 52. The notch 52u is formed by the straight sides u11 and u12. The side u11 extends on the same straight line as the long side 53L of the connecting portion 53. The side u12 extends from the approximate center of the long side 52b toward the tip of the side u11.

  FIG. 9 is a plan view showing a fifth modification of the first bus bar. In the first bus bar 415 according to the fifth modification, instead of the slit 51s in FIGS. 2 and 3, the one terminal portion 51 extends from the long side 51b to the region between the electrode connection hole 44a and the short side 51d. A sector-shaped notch 51v is formed. The notch 51v is formed by a straight side v1 and a curved side u2. The side v1 extends on the same straight line as the long side 53L of the connecting portion 53. The side v2 extends in a curved manner from the approximate center of the long side 51b toward the tip of the side v1.

  Further, instead of the slit 52s of FIGS. 2 and 3, a fan-shaped notch 52v extending from the long side 52b to the region between the electrode connection hole 44b and the short side 52d is formed in the other terminal portion 52. The notch 52v is formed by a straight side v11 and a curved side u12. The side v11 extends on the same straight line as the long side 53L of the connecting portion 53. The side v12 extends in a curved manner from the approximate center of the long side 52b toward the tip of the side v11.

  FIG. 10 is a plan view showing a sixth modification of the first bus bar. In the first bus bar 416 according to the sixth modification, the slits 51 s and 52 s shown in FIGS. 2 and 3 are not formed. Even in this case, the gap 54 between the one terminal portion 51 and the other terminal portion 52 is formed so as to cross at least the region AR (FIG. 3) between the electrode connection holes 44a and 44b facing each other in the X direction. Therefore, even when a current flows through the first bus bar 416, a current path cf is formed between the one terminal portion 51 and the other terminal portion 52 so as to pass through the connecting portion 53 while bypassing the gap 54. Therefore, substantially the same effect as that of the first bus bar 41 of FIGS. 2 and 3 can be obtained.

  FIG. 11 is a plan view showing more preferable dimensions of the first bus bar 416 according to the sixth modification. As shown in FIG. 11, in the first bus bar 416 according to the sixth modification, the distance h between the two attachment pieces 43 in the X direction is the width j of the gap 54 in the X direction (the length of the one terminal portion 51). More preferably, the distance 51b is shorter than the distance 51b between the side 51b and the long side 52b of the other terminal portion 52. In the X direction, the inner edge 43 i of the two attachment pieces 43 is more preferably set so as to be disposed inside the gap 54. In this case, the voltage between the both ends of the connection part 53 which comprises the electric current path cf by the two attachment pieces 43 can be detected more correctly.

  When the current flows through the first bus bar 416, the current flows through the connecting portion 53 with certainty. Further, the current distribution is substantially uniform at the connecting portion 53. Therefore, the resistance value of the connecting portion 53 is constant regardless of the positional deviation of the plus electrode 10a and the minus electrode 10b of the battery cell 10. Therefore, the current flowing through the first bus bar 41 by the two attachment pieces 43 can be measured more accurately.

  FIG. 12 is a plan view showing a seventh modification of the first bus bar. In the first bus bar 417 according to the seventh modification, the slits 51 s and 52 s of FIGS. 2 and 3 are not formed, but the connecting portion 53 is made of a material different from the material other than the connecting portion 53. .

  The connection part 53 has the structure by which nickel plating was given to the surface of the copper manganese alloy, for example. Portions other than the connecting portion 53 (one terminal portion 51, the other terminal portion 52, and the two attachment pieces 43) have a structure in which nickel plating is applied to the surface of tough pitch copper. In the first bus bar 417, for example, the one terminal portion 51 and the other terminal portion 52 are arranged at a predetermined interval, and a region between the one terminal portion 51 and the other terminal portion 52 is filled with a copper manganese alloy by welding. It is produced by. In the first bus bar 417, the shunt resistance between the two attachment pieces 43 can be set large enough to enable voltage detection. Thereby, the voltage between the two attachment pieces 43 can be accurately detected by the current detection unit 110. As a result, the value of the current flowing through the first bus bar 41 can be accurately measured.

  Moreover, since resistance value can be made small in parts other than the connection part 53, when an electric current flows into the 1st bus bar 417, it is suppressed that the part of the 1st bus bar 417 other than the connection part 53 generates heat.

  FIG. 13 is a diagram showing an eighth modification of the first bus bar. FIG. 13A shows a plan view of the first bus bar 418 according to the eighth modification. In the first bus bar 418 according to the eighth modification, instead of the slit 51 s in FIGS. 2 and 3, a region between the long side 51 b and the electrode connection hole 44 a and the short side 51 d on one surface of the one terminal portion 51. A groove 51g having a constant width extending up to is formed. The groove 51g extends on the same straight line as the long side 53L of the connecting portion 53.

  Further, instead of the slit 52s of FIGS. 2 and 3, a groove 52g having a constant width extending from the long side 52b to the region between the electrode connection hole 44b and the short side 52d is formed on one surface of the other terminal portion 52. . The groove part 52g extends on the same straight line as the long side 53L of the connecting part 53.

  FIG. 13B shows a cross section taken along the line Q-Q in FIG. In the example of FIG. 13B, a groove 52 g is formed on one surface of the other terminal portion 52. On the other hand, in the terminal portion 52, the thickness u of the portion where the groove portion 52g is formed is set to be 0.1 to 0.2 times the thickness t of the other portion. In this case, the resistance value of the portion where the groove 52g is formed is higher than the resistance value of the other portion of the other terminal portion 52. On the other hand, also in the terminal part 51, the thickness of the formation part of the groove part 51g is set to 0.1 times or more and 0.2 times or less of the thickness of another part. In this case, the resistance value of the portion where the groove portion 51 g is formed is higher than the resistance value of the other portion of the one terminal portion 51.

  Thereby, also in the 1st bus-bar 418 which concerns on an 8th modification, between the one terminal part 51 and the other terminal part 52, it passes along the connection part 53, bypassing the clearance gap 54 and the two groove parts 51g and 52g. Current path cf is formed.

  FIG. 13C shows another example of a cross section taken along the line Q-Q in FIG. The example in which the groove 51g is formed on one surface of the one terminal portion 51 and the groove 52g is formed on one surface of the other terminal portion 52 has been described above. Not only this but as shown in FIG.13 (c), the groove part 51g is formed in the common position of the one surface and other surface of the one terminal part 51, and the groove part 52g is common in the one surface and other surface of the other terminal part 52. It may be formed at a position.

  FIG. 14 is a plan view showing a ninth modification of the first bus bar. In the first bus bar 419 according to the ninth modification, instead of the slit 51s shown in FIGS. 2 and 3, a plurality of one terminal portions 51 are provided from the long side 51b to the region between the electrode connection hole 44a and the short side 51d. The through holes 51h are intensively formed. In this case, the average resistance value of the region 51k where the plurality of through holes 51h are concentrated is higher than the resistance value of the other portion of the one terminal portion 51.

  Further, instead of the slits 52 s shown in FIGS. 2 and 3, a plurality of through holes 52 h are intensively formed in the other terminal portion 52 from the long side 52 b to the region between the electrode connection hole 44 a and the short side 52 d. . In this case, the average resistance value of the region 52k where the plurality of through holes 52h are concentrated is higher than the resistance value of the other portion of the other terminal portion 52.

  Accordingly, also in the first bus bar 419 according to the ninth modification, the gap 54 and the two regions 51k and 52k are bypassed between the one terminal portion 51 and the other terminal portion 52 so as to pass through the connecting portion 53. Current path cf is formed.

  FIG. 15 is a plan view showing a tenth modification of the first bus bar. In the first bus bar 420 according to the tenth modification, instead of the slit 51s in FIGS. 2 and 3, a region between the electrode connection hole 44a and the short side 51d from the long side 51b on one surface of the one terminal portion 51 is provided. A groove portion 51g having a constant width extending to the top is formed, and a plurality of (two in this example) through holes 51h are formed in the groove portion 51g. The groove 51g extends on the same straight line as the long side 53L of the connecting portion 53.

  Further, instead of the slit 52s of FIGS. 2 and 3, a groove 52g having a constant width extending from the long side 52b to the region between the electrode connection hole 44b and the short side 52d is formed on one surface of the other terminal portion 52. A plurality of (two in this example) through holes 52h are formed in the groove 52g. The groove part 52g extends on the same straight line as the long side 53L of the connecting part 53.

  Also in this example, similarly to the eighth modification, the resistance values of the portions where the groove portions 51g and 52g are formed are higher than the resistance values of the other portions of the one terminal portion 51 and the other terminal portion 52. Accordingly, also in the first bus bar 420 according to the tenth modification, the gap 54 and the two groove portions 51g and 52g are bypassed between the one terminal portion 51 and the other terminal portion 52 so as to pass through the connecting portion 53. Current path cf is formed. In FIG. 15, the illustration of the current path cf is omitted.

  The first bus bar 41 may have the following configuration in addition to the first to tenth modifications.

  The gap 54 does not necessarily have to be formed between the one terminal portion 51 and the other terminal portion 52. For example, the gap 54 of the first bus bar 41 in FIGS. 2 and 3 may be filled with an insulating material. The mechanical strength of the first bus bar 41 is improved by filling the gap 54 with the insulating resin. Further, instead of providing the gap 54 between the one terminal portion 51 and the other terminal portion 52, a plurality of through holes may be formed in the gap 54 portion. Also in this case, the current path cf can be formed so as to bypass the portion where the plurality of through holes are formed between the one terminal portion 51 and the other terminal portion 52.

  In the first bus bars 41 and 411 to 420 shown in FIGS. 2 to 15, the two attachment pieces 43 are provided on the one surface side of the base portion 50 from the short side 51 d of the one terminal portion 51 and the end side 52 d of the other terminal portion 52. Bend and extend. Not limited to this, the two attachment pieces 43 may be formed flush with each other without being bent with respect to the base portion 50. In this case, the structure of the first bus bars 41, 411 to 420 is simplified.

(5) Other Examples of Battery Cell In the above embodiment, the battery cell 10 having a flat and substantially rectangular parallelepiped shape is used as the battery cell 10 constituting the power supply device 100. Similarly to the above, a battery cell having a cylindrical shape or a laminate type battery cell may be used as long as the first bus bar 41 is attached to the electrode terminal by screwing.

  A laminate type battery cell is manufactured as follows, for example. First, the battery element in which the positive electrode and the negative electrode are arranged with the separator interposed therebetween is accommodated in a bag made of a resin film. Subsequently, the bag in which the battery element is accommodated is sealed, and the electrolytic solution is injected into the formed sealed space.

(6) Examples and Comparative Examples (6-1) Resistance Value Variation Evaluation Test Due to Mounting Errors As Examples 1 and 2, two first bus bars 416 according to the sixth modification of FIG. 10 were produced. In addition, as a comparative example, the third bus bar 49 of FIG.

  Each produced bus bar was attached between two adjacent battery cells 10, and a test for evaluating variation in resistance value between two attachment pieces 43 due to an attachment error was performed.

  FIG. 16 is a diagram for explaining a resistance value variation evaluation test due to an attachment error. The top view of the 1st bus-bar 416 which concerns on Example 1 and Example 2 provided between the two adjacent battery cells 10 is shown by Fig.16 (a). FIG. 16B shows a plan view of the third bus bar 49 provided between two adjacent battery cells 10.

  Similarly to the examples of FIGS. 4A and 4B, in each battery cell 10 of this example, substantially rectangular support members 10s and 10t are provided at the lower ends of the plus electrode 10a and the minus electrode 10b, respectively. Is provided.

  For the first bus bar 416 according to Example 1, a known current was passed between the one terminal portion 51 and the other terminal portion 52 and the voltage between the two attachment pieces 43 was detected. A resistance value between the two mounting pieces 43 is calculated based on the current passed through the first bus bar 416 and the detected voltage between the two mounting pieces 43. This test was repeated while changing the distance s between the support member 10s of one battery cell 10 and the support member 10t of the other battery cell 10. For the first bus bar 416 according to the second example and the third bus bar 49 according to the comparative example, the same test as the first bus bar 416 according to the first example was performed.

  FIG. 17 is a graph showing the results of a resistance value variation evaluation test due to attachment errors. In the graph of FIG. 17, the vertical axis indicates the resistance value between the two mounting pieces 43, and the horizontal axis indicates the distance s in FIG. The resistance value indicated by the vertical axis is expressed as a relative ratio with respect to the reference value.

  As shown in FIG. 17, as a result of the variation evaluation test, the resistance values of the two first bus bars 416 according to Example 1 and Example 2 were approximately 1.0 regardless of the distance s. On the other hand, the resistance value of the third bus bar 49 according to the comparative example varied in the range from about 0.8 to about 1.05 as the distance s changed from 1.3 mm to 4.5 mm.

  As a result, in the first bus bar 416 of Example 1 and Example 2, it became clear that the variation in resistance value between the two attachment pieces 43 is sufficiently reduced even when an attachment error occurs.

(6-2) Test on the effect of the slits 51s and 52s in FIG. 3 As described above, in the first bus bar 41 in FIG. 3, the one terminal portion 51 is connected from the long side 51b to the electrode connection hole 44a and the short side 51d. A slit 51 s extending to a region between them is formed, and a slit 52 s extending from the long side 52 b to the region between the electrode connection hole 44 b and the short side 52 d is formed on the other terminal portion 52.

  In order to confirm the effect of these slits 51s, 52s, first bus bars 41a, 41b, 41c according to Examples 3, 4 and 5 were produced. FIG. 18 is a plan view illustrating the first bus bars 41a, 41b, and 41c according to the third, fourth, and fifth embodiments. FIG. 18A shows the first bus bar 41a according to the third embodiment, FIG. 18B shows the first bus bar 41b according to the fourth embodiment, and FIG. 18C shows the first bus bar 41a according to the fifth embodiment. One bus bar 41c is shown.

  As shown in FIG. 18A, the first bus bar 41a according to the third embodiment has substantially the same structure as the first bus bar 41 of FIG. In the first bus bar 41a, the depth of the slit 51s from the long side 51b of the one terminal portion 51 is w1, and the depth of the slit 52s from the long side 52b of the other terminal portion 52 is w1.

  As shown in FIG. 18B, the first bus bar 41b according to the fourth embodiment has substantially the same structure as the first bus bar 41 of FIG. In the first bus bar 41b, the depth of the slit 51s from the long side 51b of the one terminal portion 51 is w2, and the depth of the slit 52s from the long side 52b of the other terminal portion 52 is w2. The depth w2 of the slits 51s and 52s in FIG. 18B is smaller than the depth w1 of the slits 51s and 52s in FIG.

  As shown in FIG. 18C, the first bus bar 41c according to the fifth embodiment has substantially the same structure as the first bus bar 416 according to the sixth modification of FIG. In the first bus bar 41c, neither the one terminal portion 51 nor the other terminal portion 52 is formed with slits corresponding to the slits 51s and 52s in FIG.

  For the three first bus bars 41a, 41b, and 41c produced as described above, six measurement points p1 to p6 were set at common positions, respectively. The three measurement points p1, p2, and p3 are arranged so as to surround the electrode connection hole 44a in the one terminal portion 51. The three measurement points p4, p5, and p6 are arranged so as to surround the electrode connection hole 44b in the other terminal portion 52.

  In the first bus bar 41a according to the third embodiment, a known current is caused to flow between the measurement points p1 and p4, and a voltage between the two mounting pieces 43 is detected. Based on the value of the passed current and the detected voltage. The resistance value between the two attachment pieces 43 was calculated. Similarly, between measurement points p1 and p5, between measurement points p1 and p6, between measurement points p2 and p4, between measurement points p2 and p5, between measurement points p2 and p6, between measurement points p3 and p4, and between measurement points p3 and p5. A known current was passed between the measurement points p3 and p6, and a voltage between the two attachment pieces 43 was detected, and a resistance value between the two attachment pieces 43 was calculated.

  Regarding the calculated plurality of resistance values, when the maximum resistance value was used as a reference, the average value of the plurality of resistance values was approximately 1.00, and the minimum value of the plurality of resistance values was 0.99. As a result, the plurality of resistance values varied within a range of 1% or less based on the maximum resistance value.

  Also for the first bus bar 41b according to the fourth embodiment, a known current is passed between each two measurement points in the same manner as described above, and a voltage between the two attachment pieces 43 is detected to detect a resistance between the two attachment pieces 43. Values were calculated repeatedly. Regarding the calculated plurality of resistance values, when the maximum resistance value was used as a reference, the average value of the plurality of resistance values was 0.98, and the minimum value of the plurality of resistance values was 0.97. As a result, the plurality of resistance values varied within a range of 3% or less based on the maximum resistance value.

  Also for the first bus bar 41c according to the fifth embodiment, a known current is passed between each two measurement points in the same manner as described above, a voltage between the two attachment pieces 43 is detected, and a resistance between the two attachment pieces 43 is detected. Values were calculated repeatedly. Regarding the calculated plurality of resistance values, when the maximum resistance value was used as a reference, the average value of the plurality of resistance values was 0.93, and the minimum value of the plurality of resistance values was 0.87. As a result, the plurality of resistance values varied within a range of 13% or less based on the maximum resistance value.

  As a result, since the slits 51s and 52s are formed in the one terminal portion 51 and the other terminal portion 52, respectively, the variation occurring in the resistance value between the two attachment pieces 43 compared to the case where the slits 51s and 52s are not formed. It became clear that it can be made sufficiently small. Further, it has been clarified that as the depths of the slits 51 s and 52 s formed in the one terminal portion 51 and the other terminal portion 52 are increased, the variation occurring in the resistance value between the two attachment pieces 43 is further reduced.

(7) Correspondence between each component of claim and each part of embodiment The following describes an example of the correspondence between each component of the claim and each part of the embodiment. It is not limited.

  In the above embodiment, the plus electrode 10a and the minus electrode 10b are examples of first and second terminals, respectively, and the first bus bars 41, 41a, 41b, 41c, 411 to 420 are examples of shunt resistors. The electrode connection hole 44a is an example of a first terminal hole, the electrode connection hole 44b is an example of a second terminal hole, and the base portion 50 is an example of a conductive member.

  The region AR between the electrode connection holes 44a and 44b is an example of the region between the first and second terminal holes, the gap 54 is an example of the first current regulating portion, and the current path cf is the current path. It is an example.

  Furthermore, the side passing through the short side 51d of the one terminal portion 51, the long side 53M of the connecting portion 53, and the short side 52d of the other terminal portion 52 is an example of the first side, and the short side 51c of the one terminal portion 51 and the other side The side passing through the short side 52c of the terminal portion 52 is an example of the second side, and includes slits 51s, 52s, notches 51t, 52t, 51u, 52u, 51v, 52v, grooves 51g, 52g, and a plurality of through holes 51h, 52h is an example of the second current regulating unit.

  Further, the distance j between the long side 51b of the one terminal portion 51 and the long side 52b of the other terminal portion 52 in the X direction is an example of the width of the first current regulating portion, and the gap 54 is an example of a notch. Yes, the battery cell 10 is an example of a battery cell, and the power supply device 100 is an example of a power supply device.

  Furthermore, the plus electrode 10a and the minus electrode 10b of the battery cell 10 are examples of battery cell electrode terminals.

  As each constituent element in the claims, various other elements having configurations or functions described in the claims can be used.

  INDUSTRIAL APPLICABILITY The present invention can be effectively used for various mobile objects that use electric power as a drive source, mobile devices, or the like.

DESCRIPTION OF SYMBOLS 10 Battery cell 10a, 10b Electrode 10s, 10t Support member 40, 41, 41a, 41b, 41c, 411-420 1st bus bar 42 2nd bus bar 49 3rd bus bar 43 Attachment piece 43a Narrow part 43b Wide part 43i Edge 44a , 44b Electrode connection hole 50 Base part 51 One terminal part 51a, 51b, 52a, 52b, 53L, 53M Long side 51c, 51d, 52c, 52d Short side 51g, 52g Groove part 51k, 52k Region 51s, 52s Slit 51t, 51u, 51v, 52t, 52u, 52v Notch 52 Other terminal portion 52h Through hole 53 Connection portion 54 Gap 92a, 92b End plate 93 Side fixing member 94 Screw 100 Power supply device 110 Current detection portion 111 Conductor wire 200 Load 501 Power supply line AR region c, f, e Length f current path h, g, L, s distance j width Na nut p1~p6 measurement point resistance RS t1, t2, t3, u1, u2, u11, u12, v1, v2, v11, v12 sides u, t Thickness

Claims (7)

A shunt resistor connected to the first terminal and the second terminal,
A conductive member having first and second terminal holes into which the first and second terminals can be respectively inserted;
First and second terminal portions,
The conductive member blocks a current flow in a region between the first and second terminal holes, thereby forming a current path that bypasses the region between the first and second terminal holes. Having a first current regulating portion for regulating current,
The shunt resistor is characterized in that the first and second terminal portions are spaced from each other in a current path formed in the conductive member. The conductive member has first and second sides facing each other, and the first and second terminal holes are provided so as to be aligned in a direction parallel to the first side,
The current path is formed so as to extend along the first side, the first and second terminal portions are provided on the first side, and the first current regulating unit is provided on the second side. The shunt resistor according to claim 1, wherein the shunt resistor extends from the current path to the current path toward the first side. The conductive member includes a region extending from the first current regulating portion to a position between the first terminal hole and the first side, and the second terminal hole from the first current regulating portion. 3. The shunt resistor according to claim 2, further comprising a second current regulating portion that suppresses a current flow in a region extending to a position between the first side and the first side. The first current restricting portion has a width in a direction parallel to the first side, and the inner edges of the first and second terminal portions are within the width of the first current restricting portion. 4. The shunt resistor according to claim 2, wherein the shunt resistor is located. 5. The shunt resistor according to claim 2, wherein the first current regulating portion is a notch extending from the second side of the conductive member toward the current path toward the first side. vessel. A battery cell;
A power supply apparatus comprising: the shunt resistor according to any one of claims 1 to 5 for measuring a current flowing through the battery cell. A plurality of the battery cells are provided,
An electrode terminal of one battery cell among the plurality of battery cells is inserted as the first terminal into the first terminal hole of the shunt resistor, and another terminal is inserted into the second terminal hole of the shunt resistor. The battery cell electrode terminal is inserted as the second terminal,
The power supply device according to claim 6, wherein a current from the plurality of battery cells flows through the shunt resistor through the first terminal and the second terminal.

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