JP2020004680A - Battery pack - Google Patents

Abstract

To provide a battery pack capable of efficiently storing a battery module in an exterior body together with a voltage detection unit.SOLUTION: A battery pack BP includes a battery module 1 configured by stacking a plurality of battery cells 110, a voltage detection unit 2 electrically connected to electrode terminals 112 and 113 of the battery cell 110 via a wiring member 23, and an exterior body 3 having an inner space 30 formed in a cylindrical shape and extending in the stacking direction of the battery cells 110. The battery module 1 and the voltage detection unit 2 are housed in the inner space 30 of the exterior body 3. The voltage detection unit 2 is disposed on a side surface 1a of the battery module 1, and a concave portion 35 capable of accommodating the voltage detection unit 2 is provided in an inner surface 31a of a side wall portion 31 of the exterior body 3 corresponding to the voltage detection unit 2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a battery pack containing a battery module formed by stacking a plurality of battery cells in an inner space of an exterior body.

  A hybrid car or an electric vehicle is equipped with a battery module configured by stacking a plurality of battery cells such as lithium ion secondary batteries. Conventionally, as such a battery module, a module that detects and monitors the voltage of a battery cell by a voltage detection unit for controlling the battery cell is known (for example, see Patent Document 1).

JP 2014-516457 A

  When the battery module is mounted on a vehicle or the like, it is conceivable to pack the battery module into an exterior body in order to protect the battery cells. At this time, if the battery module includes the voltage detection unit, it is required that the battery module be efficiently housed in the exterior body together with the voltage detection unit.

  Therefore, an object of the present invention is to provide a battery pack that can efficiently house and pack a battery module together with a voltage detection unit in an exterior body.

  (1) A battery pack according to the present invention includes a battery module (eg, a battery module 1 described later) configured by stacking a plurality of battery cells (eg, a battery cell 110 described below), and an electrode terminal (eg, a battery module) of the battery cell. For example, a voltage detecting unit (for example, a voltage detecting unit 2 to be described later) electrically connected to a positive electrode terminal 112 and a negative electrode terminal 113 to be described later via a wiring member (for example, a harness 23 to be described later), and a cylindrical shape. An exterior body (e.g., an exterior body 3 described later) having an inner space (e.g., an interior space 30 described later) formed and extending in the stacking direction of the battery cells, wherein the interior space of the exterior body includes A battery pack (for example, a battery pack BP to be described later) in which a battery module and the voltage detection unit are accommodated, wherein the voltage detection unit includes a side surface ( For example, the voltage detector is disposed on an inner surface (for example, an inner surface 31a described later) of a side wall (for example, a sidewall 31 described later) of the exterior body corresponding to the voltage detector and disposed on a side surface 1a described later. It has a recess that can be accommodated (for example, a recess 35 described later).

  According to the battery pack described in the above (1), the voltage detection unit disposed on the side surface of the battery module can be housed in the concave portion provided on the inner surface of the side wall of the exterior body. In addition, the battery pack can be efficiently accommodated in the exterior body, and the size of the battery pack can be reduced.

  (2) In the battery pack according to (1), a separator (for example, a separator 140 described later) is arranged between the battery cells adjacent to the battery module, and the separator is configured such that the electrode terminal of the battery cell is A surface (for example, an upper end surface 140a to be described later) disposed on the same side as a surface (for example, a terminal surface 110a described later) to a surface (to be disposed on the same side as the side surface on which the voltage detection unit is disposed) For example, it has a notch (for example, a notch 141 described later) provided over a side end surface 140b described below, and the wiring member passes through the notch of the separator, and is connected to the electrode terminal and the electrode terminal. It is preferable to electrically connect to the voltage detection unit.

  According to the battery pack described in the above (2), since the wiring member is disposed in the notch of the separator, the amount of the wiring member protruding outside the battery module can be suppressed.

  (3) In the battery pack according to (1) or (2), one end surface (for example, an end surface 3a described later) of the exterior body along the stacking direction of the battery cells is provided inside the side wall portion of the exterior body. ) To the other end surface (for example, an end surface 3a described later), a temperature control medium passage (for example, a temperature control medium passage 36 described later) for controlling the temperature of the battery cell. It is preferable that the medium passage is arranged so as to be shifted from the medium passage in the height direction of the side wall portion.

  According to the battery pack described in the above (3), the temperature control medium passage and the concave portion can be arranged using the dead space of each other, so that the width dimension of the battery pack can be reduced, and the battery pack can be reduced. Can be further reduced in size.

  (4) In the battery pack described in (3), it is preferable that the temperature control medium passage is disposed at a position closer to the electrode terminal of the battery cell than the recess in the height direction of the side wall portion. .

  According to the battery pack described in the above (4), the temperature control medium passage is arranged in a portion of the battery cell that is closest to the electrode terminal requiring the most temperature control, so that efficient temperature control is possible.

  (5) In the battery pack according to (3) or (4), a position corresponding to the temperature control medium passage on the inner surface of the side wall portion and a position corresponding to the temperature control medium passage on the side surface of the battery module. It is preferable that a heat transfer sheet (for example, a heat transfer sheet 150 described later) be disposed between the two.

  According to the battery pack described in (5), the heat of the temperature control medium in the temperature control medium passage can be transmitted to the battery cell without being affected by the arrangement of the voltage detection unit, and the temperature of the battery cell can be controlled. Can be performed efficiently.

  (6) In the battery pack according to any one of (1) to (5), it is preferable that the recess is opened at at least one end surface of the exterior body along a stacking direction of the battery cells.

  According to the battery pack described in the above (6), the battery module can be inserted into the inner space while sliding the battery module from the side of the end face where the concave portion of the outer body is open. The work of housing the module is extremely easy.

  (7) In the battery pack according to (6), the concave portion is opened at both end surfaces of the outer package along the stacking direction of the battery cells, and the pushing direction of the outer package is in the stacking direction of the battery cells. It is preferred to be composed of an extruded product along the shape.

  According to the battery pack described in (7), the outer package can be easily manufactured, and cost reduction can be achieved.

  ADVANTAGE OF THE INVENTION According to this invention, the battery module which can accommodate a battery module in an exterior body with a voltage detection part efficiently can be provided.

1 is an overall perspective view of a battery pack according to the present invention. FIG. 3 is a perspective view showing a state where the battery pack according to the present invention is disassembled. FIG. 3 is an exploded perspective view showing a battery module of the battery pack according to the present invention. It is a principal part expansion perspective view of a battery cell and a separator. It is a principal part enlarged side view of a battery cell and a separator. FIG. 6 is a cross-sectional view of the battery pack when cut along a line (A)-(A) in FIG. 5. FIG. 6 is a cross-sectional view of the battery pack when cut along a line (B)-(B) in FIG. 5.

Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an overall perspective view of a battery pack according to the present invention. FIG. 2 is a perspective view showing a state where the battery pack according to the present invention is disassembled. FIG. 3 is an exploded perspective view showing the battery module of the battery pack according to the present invention.
The battery pack BP according to the present embodiment includes a battery module 1, a voltage detection unit 2, and an exterior body 3, and is configured such that the battery module 1 and the voltage detection unit 2 are housed in the exterior body 3. . For example, strip-shaped sealing members 37, 37 are fixed to the exterior body 3 in which the battery module 1 and the voltage detection unit 2 are accommodated by fixing screws 371. Has been prevented.

  The battery module 1 is configured by integrally fastening a plurality of stacked battery cells 110 together with a pair of end plates 120 by a fastening member 130 as shown in FIGS. 2 and 3. In the directions shown in the drawings, the direction D1 is a direction along the stacking direction of the plurality of battery cells 110, and indicates the length direction of the battery module 1. The direction D2 is a direction orthogonal to the stacking direction of the plurality of battery cells 110, and indicates the width direction of the battery module 1. The direction D3 is a direction orthogonal to the stacking direction of the plurality of battery cells 110, and indicates the height direction (up-down direction) of the battery module 1. In the direction D3, the upper side of the paper is defined as “upper”, and the lower side is defined as “lower”.

  The battery cell 110 is made of, for example, a lithium ion secondary battery, and houses an electrode body (not shown) inside a rectangular parallelepiped cell case 111 made of aluminum, an aluminum alloy, or the like. The upper surface of the battery cell 110 is covered, and serves as a terminal surface 110a on which a pair of electrode terminals of a positive electrode terminal 112 and a negative electrode terminal 113 is arranged to protrude.

  The battery cell 110 has a box shape in which the thickness along the direction D1 is sufficiently smaller than the width along the direction D2. As shown in FIG. 3, the plurality of battery cells 110 are stacked in the thickness direction with the respective terminal surfaces 110a facing upward so that the terminal surfaces 110a become the same surface. Adjacent battery cells 110 are arranged such that positive terminals 112 and negative terminals 113 are alternately arranged in a straight line when viewed in the stacking direction. Adjacent battery cells 110 are insulated and held at a fixed interval by sandwiching a separator 140 made of an insulating material.

  The end plates 120 are rectangular plate-like members formed of metal, resin, or a composite thereof, and are disposed at both ends in the stacking direction of a plurality of stacked battery cells 110. All the battery cells 110 are arranged so as to be sandwiched between the pair of end plates 120, 120, and are integrally fastened by the pair of fastening members 130, 130. In addition, as shown in FIG. 3, the separator 140 is also sandwiched between the battery cells 110 and the end plates 120 arranged at both ends in the stacking direction.

  The positive terminal 112 and the negative terminal 113 adjacent to each other in the stacking direction of the battery cells 110 are electrically connected by a bus bar 114. The bus bar 114 is fixed across the positive terminal 112 and the negative terminal 113 by fitting the adjacent positive terminal 112 and negative terminal 113. The bus bar 114 shown in the present embodiment is formed of a rectangular flat metal thin plate, but is not particularly limited, and may be, for example, a metal wire. In FIG. 3, illustration of some bus bars 114 is omitted.

  The bus bar 114 shifts the electrically connected positive terminal 112 and negative terminal 113 one by one in each row of electrode terminals on both sides of the battery cell 110. Therefore, each bus bar 114 is one of a pair of electrode terminals of the two battery cells 110 and 110 arranged at both ends in the stacking direction (in the present embodiment, the positive electrode terminal 112A of one battery cell 110 and the other terminal). Except for the negative electrode terminal 113A) of the battery cell 110, all the adjacent positive electrode terminals 112 and negative electrode terminals 113 are electrically connected to connect all the battery cells 110 in series. However, in the battery module 1, all the battery cells 110 in the battery module 1 are connected in parallel by the bus bar 114 by arranging the positive terminal 112 and the negative terminal 113 of the adjacent battery cells 110 on the same side and stacking them. May be connected.

  The fastening member 130 is a metal connection band that restrains the entire stacked battery cells 110 and the pair of end plates 120, 120, and is formed to be long along the stacking direction of the battery cells 110. The pair of fastening members 130, 130 are arranged so as to sandwich the entire stacked battery cells 110 and the pair of end plates 120, 120 from both sides. The fastening member 130 has an opening 131 that is greatly opened in a rectangular shape over the length direction. Most of the side surface 110 b of each battery cell 110 and the side end surface 140 b of each separator 140 sandwiched between the pair of end plates 120, 120 are exposed facing the opening 131.

  At both ends in the length direction (D1 direction) of the fastening members 130, 130, there are fixed pieces 132, 132 bent at right angles inward (toward the battery cells 110), respectively. As shown in FIGS. 2 and 3, the fastening member 130 is fixed to the outer surface 120a of the end plate 120 by the fixing pieces 132, 132 using an appropriate number of fixing members 133 such as bolts. Thus, a binding force is applied to all the battery cells 110 in the stacking direction between the end plates 120, 120 by the pair of fastening members 130, 130, and expansion of the battery cells 110 due to charge and discharge is suppressed.

  The voltage detection unit 2 according to the present embodiment is disposed on a side surface 1 a of the battery module 1 facing the width direction. The side surface 1a is a surface configured by a side surface 110b of each of the plurality of stacked battery cells 110 and a side end surface 140b of each of the separators 140 sandwiched between the adjacent battery cells 110. The voltage detection unit 2 is disposed on one of the side surfaces 1a of the side surfaces 1a facing the width direction of the battery module 1. Thereby, the height of the battery module 1 is reduced, and as a result, the height of the battery pack BP can be reduced.

  The voltage detection unit 2 houses a voltage detection circuit including a plurality of electronic components (not shown) inside a rectangular parallelepiped casing 20. The voltage detector 2 according to the present embodiment extends in the length direction of the battery module 1 as shown in FIGS. 2 and 3, but is shorter than the entire length of the battery module 1. As shown in FIG. 3, the voltage detecting section 2 uses the fixing sections 21, 21 provided integrally at both ends in the length direction, and corresponds to the positions of the mounting sections 21, 21 by the fixing screws 22. It is fixed to the separator 140.

  Voltage detector 2 detects the voltage of battery cell 110 via a plurality of harnesses 23, and outputs the detection result to the outside of battery module 1 (outside of battery pack BP) via a signal line (not shown). . This harness 23 corresponds to the “wiring member” of the present invention. FIG. 3 shows only a part of the harness 23.

  One end of each harness 23 is fixed to each of the bus bars 114 by an appropriate fixing means such as soldering or screwing, and is electrically connected. The other end of each harness 23 extends from the bus bar 114 to the voltage detection unit 2 through the separator 140. As shown in FIG. 3, a connector 231 is provided at the other end of each harness 23. The other end of each harness 23 is detachably connected to the housing 20 of the voltage detection unit 2 by a connector 231 and is electrically connected to a voltage detection circuit inside the housing 20. However, the other end of each harness 23 may be irremovably connected to the voltage detection unit 2.

Here, the details of the separator 140 will be described with reference to FIG. FIG. 4 is an enlarged perspective view of main parts of a battery cell and a separator.
The separator 140 is formed of a rectangular plate-like member formed of an insulating member such as a resin. The upper end surface 140a of the separator 140 is a surface arranged on the same side as the terminal surface 110a of each battery cell 110, and the side end surface 140b of the separator 140 shown in FIG. This is a surface arranged on the side surface 1a of the module 1.

  The separator 140 has a cutout 141 extending from the upper end surface 140a to the side end surface 140b. The notch 141 is formed so as to open from the upper end surface 140a to the side end surface 140b. The notch 141 in the side end surface 140b extends to a position above the mounting portion of the voltage detection unit 2. The notch width of the notch 141 (width along the direction D1) is smaller than the thickness of the separator 140 (thickness along the direction D1). For this reason, the notch 141 is formed in a slit shape having a predetermined depth from the upper end surface 140a of the separator 140 to the side end surface 140b. However, the notch width of the notch portion 141 is equal to or larger than the outer diameter of the harness 23.

  The side end surface 140b of the separator 140 is arranged so as to be flush with the side surface 110b of each of the plurality of stacked battery cells 110 or to be slightly retracted from the side surface 110b. However, on a part of the side end surface 140b disposed below the notch 141, a convex portion 142 slightly protruding laterally from the side surface 110b of the battery cell 110 is provided. The convex portion 142 forms a mounting portion of the voltage detecting unit 2. On the surface of the convex portion 142, a screw hole 143 for screwing a fixing screw 22 for fixing the mounting portion 21 of the voltage detecting unit 2 is provided. The projection 142 is disposed inside the opening 131 of the fastening member 130 and is exposed from the opening 131.

  The electrical connection structure between the bus bar 114 and the voltage detection unit 2 by the harness 23 via the separator 140 will be further described with reference to FIGS. FIG. 5 is an enlarged side view of a main part of the battery cell 110 and the separator 140. FIG. 6 is a cross-sectional view of the battery pack BP when cut along the line (A)-(A) in FIG. FIG. 7 is a cross-sectional view of the battery pack BP when cut along the line (B)-(B) in FIG.

  Each of the separators 140 provided in the battery module 1 according to the present embodiment has the same structure. Therefore, in the battery module 1, the notch 141 of the separator 140 and the protrusion 142 below the notch 141 are arranged between the adjacent battery cells 110. The voltage detection unit 2 is mounted so as to be in contact with the protrusion 142, and is fixed to the screw hole 143 of one of the protrusions 142 corresponding to the mounting portions 21 by the fixing screw 22. As a result, the voltage detector 2 is fixed to the side surface 1 a of the battery module 1 inside the opening 131 of the fastening member 130, and protrudes laterally from the fastening member 130 through the opening 131. Since the voltage detection unit 2 is fixed to the protrusion 142 of the separator 140, the voltage detection unit 2 is disposed so as to be slightly separated from the side surface 110 b of the battery cell 110, and does not directly contact the battery cell 110. For this reason, a metal housing 20 can be used for the voltage detection unit 2.

  Each of the harnesses 23 extends from the bus bar 114 toward the voltage detecting unit 2 along the separator 140, and is connected to the voltage detecting unit 2 through the notch 141 at a portion of the notch 141. In the battery module 1 according to the present embodiment, all the harnesses 23 pass inside the fastening members 130 and are wired through the cutouts 141 of any of the separators 140. For this reason, as shown in FIGS. 2, 6, and 7, all the harnesses 23 are collectively arranged inside the fastening member 130 and do not protrude greatly outside the battery cells 110 and the separator 140. Thus, the amount of the harness 23 projecting outside the battery module 1 is suppressed.

  As shown in FIGS. 2 and 3, heat transfer sheets 150, 150 made of synthetic resin having excellent heat conductivity such as silicone rubber are provided on each side surface 1 a, 1 a of the battery module 1. The heat transfer sheet 150 is formed in a long sheet shape along the length direction of the battery module 1 so as to contact the side surfaces 110b of all the battery cells 110. The heat transfer sheet 150 is adhered to both side surfaces 1 a and 1 a of the battery module 1 facing the opening 131 of the fastening member 130, respectively. Smaller than the amount of protrusion to the side. That is, the voltage detection unit 2 projects laterally beyond the heat transfer sheet 150.

  The heat transfer sheets 150 are arranged at the same height on the side surfaces 1a. Specifically, the heat transfer sheet 150 is disposed upward in the opening 131 of the fastening member 130 so as to be as close as possible to the electrode terminals (the positive electrode terminal 112 and the negative electrode terminal 113) of the battery cell 110. Is done. The heat transfer sheet 150 disposed on the same side surface 1 a as the voltage detection unit 2 is disposed above the voltage detection unit 2.

  The exterior body 3 is formed in a cylindrical shape from a metal material such as aluminum, and is provided so as to cover the outer periphery of the battery module 1 configured as described above. Specifically, the exterior body 3 is formed in a rectangular cylindrical shape by left and right side walls 31 and 32, an upper wall 33, and a bottom wall 34, and has a lengthwise direction of the battery module 1, It has an inner space 30 extending along the stacking direction of the cells 110. The inner space 30 shown in the present embodiment has a rectangular opening on both end surfaces 3a, 3a of the exterior body 3, respectively. The inner space 30 extends along the length direction (D1 direction) of the exterior body 3 with a rectangular opening shape.

  As shown in FIG. 6, the width W1 of the inner space 30 is larger than the width W2 of the battery module 1 excluding the voltage detection unit 2 and the heat transfer sheets 150, 150, and is larger than the voltage detection unit 2 and the heat transfer sheets 150, 150. Is smaller than the width W3 of the battery module 1 including For this reason, the inner surface 31a of the side wall 31 on the side facing the inner space 30 (on the side where the voltage detector 2 of the battery module 1 is disposed) is provided at the position corresponding to the voltage detector 2 at the position corresponding to the voltage detector 2. Has a recess 35 capable of accommodating the same. Since the voltage detection unit 2 according to the present embodiment is disposed near the lower part of the battery module 1, the recess 35 is also disposed near the lower part (closer to the bottom wall part 34) of the inner surface 31 a of the side wall part 31.

  The battery module 1 is housed in the inner space 30 of the exterior body 3 with the voltage detection unit 2 housed in the recess 35. For this reason, the battery module 1 is efficiently accommodated in the exterior body 3 together with the voltage detection unit 2. Since the voltage detecting portion 2 protruding laterally from the side surface 1a of the battery module 1 is accommodated in the concave portion 35, the side wall portion 31 can be brought as close to the battery module 1 as possible. Thereby, the width of the exterior body 3 can be suppressed, and the size of the battery pack BP can be reduced.

  The concave portions 35 shown in the present embodiment are formed so as to open on both end surfaces 3a, 3a of the exterior body 3, respectively. That is, the concave portion 35 is formed with a constant depth over the entire length of the side wall portion 31. However, the recess 35 may be formed so as to open on at least one end face 3 a of the exterior body 3. Thereby, the battery module 1 in which the voltage detection unit 2 is disposed on the side surface 1a can be inserted (slot-in) from the end surface 3a side of the exterior body 3 in which the concave portion 35 opens while sliding into the inner space 30. Become. Therefore, the work of housing the battery module 1 in the exterior body 3 can be performed extremely easily. The exterior body 3 does not need to have a divided structure. In the case where the concave portion 35 is opened on both end surfaces 3a, 3a of the exterior body 3, the housing operation of the battery module 1 can be performed from either side of the both end surfaces 3a, 3a of the exterior body 3, further improving workability. Can be improved.

  On the side walls 31 and 32 of the exterior body 3, temperature control medium passages 36 and 36 for controlling the temperature of the battery cells 110 are provided, respectively. The temperature control medium passages 36, 36 extend linearly and continuously from one end face 3a of the exterior body 3 to the other end face 3a along the length direction of the exterior body 3. The temperature control medium is supplied from a temperature control medium supply pipe (not shown) to the temperature control medium passages 36, 36 so that the temperature control medium flows through the side walls 31, 32 of the exterior body 3. As the temperature control medium, cold air or cooling water for cooling the battery cells 110 is generally used. However, when it is necessary to heat the battery cells 110, hot air or hot water can be used.

  The positions of the temperature control medium passages 36 in the height direction correspond to the positions of the heat transfer sheets 150 of the battery module 1 in the height direction. The temperature control medium passages 36, 36 shown in the present embodiment are disposed closer to the upper part (closer to the upper wall 33) in the height direction of the side walls 31, 32, and the electrode terminals (positive electrode terminals) of the battery cells 110 than the recesses 35. 112 and the negative electrode terminal 113). Therefore, the heat transfer sheets 150 of the battery module 1 are positioned closer to the upper part (closer to the upper wall part 33) in the height direction of the side wall parts 31 and 32, corresponding to the positions of the temperature control medium passages 36. It contacts the inner surfaces 31a, 32a of 31, 32. Thereby, the heat of the temperature control medium in the temperature control medium passages 36, 36 is transmitted through the relatively thin wall portions 361, 361 disposed between the temperature control medium passages 36, 36 and the inner space 30. The heat is transmitted to the heat sheets 150, 150, and further transmitted from the heat transfer sheets 150, 150 to each battery cell 110. In the present embodiment, the temperature control medium passages 36, 36 are arranged at positions near the electrode terminals (the positive electrode terminal 112 and the negative electrode terminal 113) of the battery cell 110 that require the most temperature control, so that efficient temperature control can be achieved. It is possible.

  The concave portion 35 and the temperature control medium passage 36 are shifted from each other in the height direction of the side wall portion 31, and are arranged using the mutual dead space. That is, the concave portion 35 shown in the present embodiment is displaced below the temperature control medium passage 36 and is provided using a dead space below the temperature control medium passage 36. For this reason, even if the concave portion 35 and the temperature control medium passage 36 are formed in the side wall portion 31, the thickness of the side wall portion 31 can be suppressed to a necessary minimum, whereby the size of the battery pack BP can be further reduced. . Moreover, since the inner surface 31a (wall portion 361) of the side wall portion 31 having the temperature control medium passage 36 can be made as close as possible to the battery module 1, the thickness of the heat transfer sheet 150 can be reduced, and the heat transfer sheet 150 can be reduced. Thus, the temperature adjustment efficiency of the battery cell 110 via the battery is also improved.

  The inner space 30, the concave portion 35, and the temperature control medium passages 36, 36 of the exterior body 3 can be formed, for example, by cutting the exterior body 3 formed in a cylindrical shape. Like the body 3, all of the inner space 30, the recess 35, and the temperature control medium passages 36, 36 are linearly continuous along the length direction of the exterior body 3, and are formed on both end faces 3 a, 3 a of the exterior body 3. In the case of opening, an extruded product extruded along the stacking direction of the battery cells 110 can be used. Thereby, the exterior body 3 having a uniform structure along the length direction can be easily manufactured, and the cost of the battery pack BP can be reduced.

  The battery pack according to the present invention is not limited to the embodiment described above, and various changes can be made within the scope of the present invention. For example, in order to prevent the battery module 1 housed in the exterior body 3 from coming out, a cover member for closing the entire end surface 3a of the exterior body 3 may be provided instead of the band-shaped sealing member 37. By providing the lid member with a communication port communicating with the temperature control medium passages 36, 36, the temperature control medium can be circulated in each temperature control medium passage via the communication port.

Further, a notch groove communicating with the notch portion 141 is formed in the separator 140 over the entire length of the upper end surface 140a, and the harness 23 extending from the bus bar 114 to the voltage detection unit 2 through the upper end surface 140a of the separator 140 is formed. May be passed through the notch groove to further suppress the harness 23 from projecting upward.
Furthermore, the temperature control medium passage 36 and the heat transfer sheet 150 on the side where the voltage detection unit 2 is not disposed may be formed over the entire length in the height direction.

DESCRIPTION OF SYMBOLS 1 Battery module 1a Side surface (of battery module) 110 Battery cell 110a Terminal surface (of battery cell) 112 Positive electrode terminal (electrode terminal)
113 Negative electrode terminal (electrode terminal)
140 Separator 140a Upper end face of (separator) 140b Side end face of (separator) 141 Notch part 150 Heat transfer sheet 2 Voltage detector 23 Harness (wiring member)
3 Exterior Body 3a End Surface (of Exterior Body) 30 Inner Space 31 Side Wall Part (of Exterior Body) 31a Inner Surface (of Side Wall Part) 35 Recess 36 Temperature Control Medium Path BP Battery Pack

Claims (7)

A battery module configured by stacking a plurality of battery cells; a voltage detection unit electrically connected to an electrode terminal of the battery cell via a wiring member; and a cylindrically formed battery cell in a stacking direction of the battery cells. An exterior body having an extended inner space, wherein the inner space of the exterior body contains the battery module and the voltage detection unit,
The voltage detector is disposed on a side of the battery module,
A battery pack having a recess capable of accommodating the voltage detection unit on an inner surface of a side wall of the exterior body corresponding to the voltage detection unit. A separator is arranged between the battery cells adjacent to the battery module,
A cutout portion provided from a surface of the battery cell, which is arranged on the same side as a surface on which the electrode terminals are arranged, to a surface of the battery cell, which is arranged on the same side as the side surface on which the voltage detection unit is arranged. Has,
2. The battery pack according to claim 1, wherein the wiring member electrically connects the electrode terminal and the voltage detection unit through the notch of the separator. 3. Inside the side wall portion of the exterior body, from one end surface of the exterior body along the stacking direction of the battery cells to the other end surface, a temperature control medium passage for adjusting the temperature of the battery cell,
3. The battery pack according to claim 1, wherein the concave portion and the temperature control medium passage are arranged to be shifted from each other in a height direction of the side wall portion. 4.   4. The battery pack according to claim 3, wherein the temperature control medium passage is arranged at a position closer to the electrode terminal of the battery cell than the recess in the height direction of the side wall. 5.   The heat transfer sheet is disposed between a position corresponding to the temperature control medium passage on an inner surface of the side wall portion and a position corresponding to the temperature control medium passage on the side surface of the battery module. The battery pack according to 3 or 4.   The battery pack according to any one of claims 1 to 5, wherein the concave portion is opened on at least one end surface of the exterior body along the stacking direction of the battery cells. The concave portion is opened at both end surfaces of the exterior body along the stacking direction of the battery cells,
7. The battery pack according to claim 6, wherein the exterior body is formed of an extruded product whose extrusion direction is along a direction in which the battery cells are stacked. 8.

Images