JP2013073917A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy-to-assemble battery pack with a simple structure.SOLUTION: In a battery pack, plural electric cells 7 are aligned and housed in a case 2. The case 2 comprises: a first case member 2 having a bottom part and both walls; a second case member 3a arranged on one end of the first case member 2; a third case member 3b arranged on the other end of the first case member 2; and a coupling member 4 coupling the second case member 3a and the third case member 3b with the first case member 2 interposed therebetween. A space is formed on walls 13a, 13b of the first case member 2, and the coupling member 4 is arranged in this space.

Description

  The present invention relates to an assembled battery in which a plurality of unit cells are combined, and more particularly to a structure of a case that accommodates the assembled battery.

  Conventionally, various structures for fastening an assembled battery formed by stacking a plurality of unit cells and spacers and structures for accommodating the assembled battery in a case have been proposed.

For example, in Patent Document 1, a unit battery and a partition (separator) are stacked, end plates are arranged at both ends of the outermost side, these are fastened with rods, accommodated in a housing, and the end plate is screwed to the housing The structure to be fixed is described.
Patent Document 2 discloses a battery block in which battery cells and spacers are stacked and fixed with an end plate and a binding bar, and an outer case composed of a lower case, end plate at both ends of the lower case, and an upper case covering the lower case. And a cooling medium supply port on one end surface plate and a cooling medium discharge port on the other end surface plate are described.
In Patent Document 3, a battery module in which end plates are arranged at both ends of a battery module in which a plurality of battery cells are stacked and connected by a belt is mounted on a casing including an upper case and a lower case together with an intake duct and an exhaust duct. A housed and fixed structure is described.
In any of the structures of Patent Documents 2 to 4, since the assembled battery in which the single battery and the separator are stacked is fixed and then accommodated in the case, the structure is complicated and the assembly becomes complicated. Moreover, since the metal fastening member that fixes the assembled battery touches the cooling medium, there is a problem that rust is generated by moisture mixed in the cooling medium.

Patent Document 4 describes a structure in which an assembled battery is accommodated in a space surrounded by casings on both ends and ducts on both sides, and the upper end of the casing on one end and the upper end of the casing on the other end are connected by a positioning member. .
In this structure, the refrigerant passages are formed in the ducts on both sides, which are part of the casing, and the structure is simple. However, since the upper ends of the casings on both ends are connected by positioning members, the bus bar and controller The positioning member cannot be attached unless all of these are attached. Further, since the positioning member is on the outside, there is a problem that the assembled battery is increased in size.

Patent Document 5 describes a structure in which a battery housing having a plurality of coupling grooves formed on the upper surface and battery cells accommodated in the respective coupling grooves, and cooling channels are formed around the respective coupling grooves of the battery housing. ing.
This structure has a problem that the battery housing requires a coupling groove corresponding to the number of battery cells, and the structure is complicated.

JP 2006-156406 A JP 2010-272251 A JP 2007-165200 A JP 2011-76967 A JP 2010-199070 A

  The present invention has been made in view of the above-described conventional problems, and provides an assembled battery that can downsize the entire assembled battery, increase the strength of the case, and protect the connecting member from rust and the like. Is an issue.

As means for solving the above problems, the present invention provides:
In the assembled battery in which a plurality of single cells are arranged side by side and accommodated in a case, the case is
A first case member having a bottom portion and wall portions on both sides;
A second case member disposed at one end of the first case member;
A third case member disposed at the other end of the first case member;
A connecting member for connecting the second case member and the third case member via the first case member;
A space is formed in the wall portion of the first case member, and the connecting member is disposed in the space.
Here, the first case member has a bottom portion and walls on both sides,
The second case member closes an opening at one end of the first case member;
The third case member may close an opening at the other end of the first case member.
In addition, a spacer may be disposed between the unit cells.

The wall portions of the first case member each include an outer wall and an inner wall,
It is preferable that a rib for connecting the outer wall and the inner wall is provided between the outer wall and the inner wall.
If it does in this way, the intensity | strength of a 1st case member will increase by a rib and it will prevent that it deform | transforms with respect to the pressure in a refrigerant path, or external force.
It is preferable that the ribs extend from one end of the wall portion toward the other end in that the strength is further increased.
Further, it is preferable that a refrigerant passage is formed in the wall portion of the first case member by the rib. Thereby, while improving the intensity | strength of a wall part, a refrigerant path can be ensured.

A plurality of the ribs are provided,
It is preferable that a space isolated from the refrigerant passage is formed between the two adjacent ribs, and the connecting member is disposed in the space.
Thereby, it is prevented that a connection member contacts a refrigerant | coolant and it can prevent that rust arises with the water | moisture content contained in a refrigerant | coolant.

The connecting member includes a rod-shaped main body, and fastening portions that are thinner than the main body at both ends of the main body.
It is preferable that the length of the main body is greater than the length from one end to the other end of the first case member.
Thereby, even if the nut is fastened to the fastening portion of the connecting member and the second case member and the third case member are connected, the first case member is not tightened and the first case member is prevented from being deformed. can do.

Forming a refrigerant inlet in the second case member to communicate with the refrigerant passage of the wall on one side of the first case member;
Forming a refrigerant outlet communicating with the refrigerant passage in the wall on the other side of the first case member in the third case member;
It is preferable that protrusions inserted into the refrigerant passage are formed at the opening edges of the refrigerant inlet and the refrigerant outlet.
As an alternative, protrusions inserted into the refrigerant inlet and the refrigerant outlet may be formed at the end of the refrigerant passage of the first case member.
Thereby, it is possible to prevent the gap between the first case member and the second case member and the gap between the first case member and the third case member from being blocked by the protrusions and leaking the cooling medium. .

According to the present invention, since the connecting member is disposed in the space formed in the wall on both sides of the first case member, the size of the connecting member does not affect the size of the entire assembled battery, It can be downsized.
Further, the strength of the first case member is increased by the connecting member, and the internal battery can be protected against external force.
Furthermore, since the connection member is arrange | positioned in the space formed in the wall part of the both sides of a 1st case member, it can protect from rust etc.

The perspective view of the assembled battery which concerns on this invention. The exploded perspective view of the assembled battery of FIG. The exploded perspective view of an assembled battery assembly. The perspective view of a stack case, an end plate, and a stack outside. (A) is a perspective view of a spacer, (B) is a front view of a spacer. (A) The perspective view of two types of bottom members, (B) is the sectional drawing. (A) Perspective view of two types of inner lid members, (B) is a sectional view thereof. The perspective view which shows the condition which accommodates the set of a bottom member, a cell, and a spacer in a stack case. The perspective view which shows the condition which attaches a bus-bar and an inner cover member to the cell and spacer which were accommodated in the stack case. Sectional drawing of the assembled battery. The top view of the assembled battery which shows the wiring state of a harness. Sectional drawing which shows the cooling flow path of an assembled battery. Sectional drawing which shows the insulation structure around the terminal of a cell. Sectional drawing which shows the connection state of the fastening state by an assembly | attachment shaft, and the refrigerant | coolant inlet and refrigerant outlet of an end plate, and the refrigerant path of a stack case.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In this specification, for convenience of explanation, as shown in FIG. 1, the X and Y axes orthogonal to each other in the horizontal plane and the Z axis in the vertical plane orthogonal to these X and Y axes are set. The directions parallel to the X, Y, and Z axes are referred to as the X direction, the Y direction, and the Z direction, respectively.

  FIG. 1 shows an assembled battery 1 according to an embodiment of the present invention. As shown in FIG. 2, the assembled battery 1 is roughly composed of a stack case 2, end plates 3 a and 3 b, an assembly shaft 4, a stack outer lid 5, and an assembled battery assembly 6. The stack case 2, the end plate 3a, the end plate 3b, and the assembly shaft 4 are a first case member, a second case member, a third case member, and a connecting member of the present invention, respectively.

  As shown in FIG. 4, the stack case 2 is manufactured from a steel plate. The stack case 2 includes a rectangular bottom plate 12 extending in the X direction and the Y direction, and a left wall portion 13a and a right wall portion 13b that rise in the Z direction at both ends of the bottom plate 12 in the Y direction. Both ends in the X direction and the upper end in the Z direction of the stack case 2 are open.

The bottom plate 12 has a convex portion 14 whose central portion is formed slightly higher than both end portions in the Y direction. The convex portion 14 reinforces the bottom plate 12 and is formed so that a concave portion 54 of the bottom member 9 described later engages so as to be movable in the X direction.
The left wall portion 13 a and the right wall portion 13 b are composed of an outer wall 15 and an inner wall 16. The lower end of the outer wall 15 is formed integrally with the bottom plate 12 so as to be continuous with both ends of the bottom plate 12 in the Y direction. The lower end of the inner wall 16 is joined to the bottom plate 12. The outer wall 15 and the upper end 17 of the inner wall 16 are bent and joined in an L shape in a direction approaching each other.

Between the outer wall 15 and the inner wall 16 of the left wall portion 13a, there are provided two ribs 18a and 18b extending in the X direction and having both ends in the Y direction joined to the outer wall 15 and the inner wall 16. A space between the outer wall 15 and the inner wall 16 above the upper rib 18 a forms a first refrigerant passage 19. A space between the outer wall 15 and the inner wall 16 below the lower rib 18b forms a second refrigerant passage 20. The cross section perpendicular to the X direction of the first refrigerant passage 19 is formed smaller than the cross section perpendicular to the X direction of the second refrigerant passage 20. The size of the first refrigerant passage 19 and the second refrigerant passage 20 may be determined so that a large amount of refrigerant flows in a portion where the surface temperature of the unit cell 7 is high, and is not limited to the shape of the embodiment.
Similarly, a third refrigerant passage 21 and a fourth refrigerant passage 22 are formed in the right wall portion 13b by ribs 18a and 18b.

A plurality of first openings 23 communicating with the first refrigerant passage 19 are formed in the inner wall 16 of the left wall portion 13a at a constant interval that is the same as the arrangement interval of the spacers 8 described later in the X direction. Similarly, a plurality of second openings 24 communicating with the second refrigerant passage 20 are formed in the X direction at the same regular intervals as the first openings 23. The first opening 23 and the second opening 24 have the same width in the X direction, but have different lengths in the Z direction, and are formed so that the first opening 23 is smaller than the second opening 24. ing. Similar to the first refrigerant passage 19 and the second refrigerant passage 20, the size of the first opening 23 and the second opening 24 is determined so that a large amount of refrigerant flows in a portion where the surface temperature of the unit cell 7 is high. Well, the shape of the embodiment is not limited.
A third opening 25 and a fourth opening 26 similar to the first opening 23 and the second opening 24 of the left wall 13a are also formed on the inner wall 16 of the right wall 13b.
The ribs 18a and 18b increase the strength of the stack case 2 in which the refrigerant passages 19, 20, 21, and 22 are formed, and can prevent deformation of the refrigerant passages 19, 20, 21, and 22 due to pressure and external force. There are benefits.
Further, since the space between the ribs 18a and 18b is isolated from the refrigerant passages 19, 20, 21, and 22 by the ribs 18a and 18b, an assembly shaft 4 to be described later inserted between the ribs 18a and 18b is provided. Contact with the refrigerant is prevented, and rust can be prevented from being generated by moisture contained in the refrigerant.

  Nuts 27 for fixing the stack outer lid 5 with screws are fixed to the upper end portions 17 of the wall portions 13a and 13b.

  The end plates 3 a and 3 b are plate-like members that close the openings at both ends in the X direction of the stack case 2. In FIG. 4, at one end portion of the left end plate 3 a, a first refrigerant inlet 28 that communicates with the first refrigerant passage 19 of the left wall 13 a of the stack case 2 and a second refrigerant inlet 29 that communicates with the second refrigerant passage 20. Is formed. Similarly, at the end of the right end plate 3b, a first refrigerant outlet 30 that communicates with the third refrigerant passage 21 of the right wall 13b of the stack case 2 and a second refrigerant outlet 31 that communicates with the fourth refrigerant passage 22 are provided. Is formed. The first and second refrigerant inlets 28 and 29 and the first and second refrigerant outlets 30 and 31 have protrusions 32 protruding toward the stack case 2 at the edges facing the stack case 2. The part 32 is inserted into the first and second refrigerant passages 19 and 20, the third and fourth refrigerant passages 21 and 22, so that the cooling medium does not leak from the gap between the stack case 2 and the end plates 3a and 3b. It has become. Instead of providing the protrusions 32 at the opening edges of the first and second refrigerant inlets 28 and 29 and the first and second refrigerant outlets 30 and 31, the first refrigerant passage 19 and the second refrigerant passage 20 of the stack case 2 are used. Even if protrusions inserted into the first and second refrigerant inlets 28 and 29 and the first and second refrigerant outlets 30 and 31 are provided at the ends of the third refrigerant passage 21 and the fourth refrigerant passage 22, the same applies. The following effects can be obtained. A slit 33 into which an insertion piece 39 of the stack outer lid 5 to be described later is inserted is formed on the upper end surfaces of the end plates 3a and 3b. Further, a notch 34 for pulling out a harness is formed at the center of the upper end surfaces of the end plates 3a and 3b.

  As shown in FIG. 2, the assembly shaft 4 is a round bar inserted between the two ribs 18 a and 18 b of the stack case 2. The assembly shaft 4 includes a central large-diameter portion 35 and small-diameter portions 36 at both ends. The large diameter part 35 and the small diameter part 36 are a main body part and a fastening part of the present invention, respectively. The main body is not limited to a round bar but may be a square bar. Nuts 37 are attached to the small diameter portions 36 at both ends of the shaft 4. The length of the central large diameter portion 35 of the shaft 4 is longer than the length of the stack case 2 in the X direction, and nuts 37 are fastened to the small diameter portions 36 at both ends of the shaft 4 via the end plates 3a and 3b. However, the stack case 2 is formed so as not to be crushed.

  Returning to FIG. 4, the stack outer lid 5 is manufactured from a steel plate. At both ends in the Y direction of the stack outer lid 5, attachment pieces 38 that are screwed to the upper end portion 17 of the stack case 2 by being bent toward the stack case 2 in the Z direction are formed. Insertion pieces 39 to be inserted into the slits 33 of the end plates 3a and 3b are formed at both ends of the stack outer lid 5 in the X direction by bending in the Z direction toward the end plates 3a and 3b. The stack outer lid 5 has a convex portion 40 formed slightly higher than both end portions in the Y direction at the central portion of the inner surface. The convex portion 40 is formed so as to reinforce the stack outer lid 5 and engage with a concave portion 71 of the inner lid member 11 to be described later to hold the inner lid member 11.

  In FIG. 3, the assembled battery assembly 6 includes a plurality of single cells 7, one spacer 8 more than the assembled battery 7, the same number of bottom members 9 as the assembled battery 7, and one bus bar 10 less than the assembled battery 7. The same number of inner lid members 11 as the assembled battery 7 are included.

  The unit cell 7 is a non-aqueous secondary battery such as a lithium ion battery. The unit cell 7 has a width in the X direction, a depth in the Y direction, and a height in the Z direction that can be accommodated between the left wall portion 13 a and the right wall portion 13 b of the stack case 2. The unit cell 7 has positive and negative electrodes 41 and 42 on the upper surface. The single battery 3 may literally be a single battery, or may be composed of a plurality of small battery units arranged in the X direction.

As shown in FIG. 5, the spacer 8 is molded from a synthetic resin. The spacer 8 has an upper beam 43 and a lower beam 44 extending in the Y direction. Between the upper beam 43 and the lower beam 44, a first uneven portion 45, a second uneven portion 46, and a straight portion 47 are provided. Is formed.
The first concavo-convex portion 45 has a concave portion and a convex portion alternately formed in a waveform in the Z direction on the first surface viewed from the X direction. The concave portion and the convex portion are also formed on the second surface on the back side of the first surface. Waveforms are formed alternately in the direction.
As in the first uneven portion 45, the second uneven portion 46 has concave portions and convex portions alternately formed in a waveform, but the concave portions and convex portions of the first uneven portion 45 are formed in reverse.
The straight portion 47 connects the upper rail 43 and the lower rail 44, extends straight in the Z direction, and prevents the spacer 8 from extending in the Z direction.

An insulating wall 48 having a width in the Y direction larger than the terminals 41, 4 of the unit cell 7 is integrally formed near one end of the upper end of the upper rail 43 of the spacer 8 so as to protrude upward. By forming the insulating wall 48 integrally with the spacer 8, it is not necessary to provide the insulating wall 48 as a separate component separately, and the number of components is reduced. Two engagement holes 49a and 49b are formed in the insulating wall 48 side by side in the Y direction. Engagement protrusions 65 of the inner lid member 11, which will be described later, are engaged with the engagement holes 49a and 49b.
A pair of engaging claws 50a and 50b are formed on both sides of the lower end of the lower rail 43 of the spacer 8, respectively. The engaging claws 50a and 50b are formed by forming a claw at the tip of the elastic arm, and engage with an engaging hole 53 of the bottom member 9 described later.

As shown in FIG. 6, the bottom member 9 is molded from a synthetic resin. The bottom member 9 is provided corresponding to each unit cell 7. The bottom member 9 includes a base 51 on which one cell 7 is placed on the upper surface, and protruding pieces 52 that rise in the Z direction from both ends of the base 51 in the Y direction.
The base 51 is formed with an engagement hole 53 that engages with a pair of engagement claws 50a and 50b of the spacer 8 at one side end. A recess 54 is formed on the bottom surface of the base 51 to engage with the protrusion 14 of the stack case 2 described above. A long hole 55 is formed in the base 51 in order to reduce weight and prevent sink marks during molding.
The protruding piece 52 is interposed in the gap between the left and right wall portions 13a, 13b of the stack case 2 and the unit cell 7, and prevents the unit cell 7 from moving in the Y direction.
Since the bottom member 9a located at the extreme end in the X direction of the assembled battery assembly 6 is formed with engagement holes 53 on both side ends of the base 51 so that the two spacers 8 are attached, the other bottom member 9 It is formed wider than.

  Returning to FIG. 3, the bus bar 10 is made of a conductive plate-like material, and electrically connects the positive terminal 41 and the negative terminal 42 of the adjacent unit cell 7.

  As shown in FIG. 7, the inner lid member 11 is molded from a synthetic resin. The inner lid member 11 is provided corresponding to each unit cell 7. The inner lid member 11 is composed of two types, a first inner lid member 11a and a second inner lid member 11b. The inner lid member 11 has substantially the same width as the short-side dimension of the unit cell 7 when viewed from the surface of the unit cell 7 where the terminals 41 and 42 are present, and is substantially the same length as the long-side dimension of the unit cell 7. Have Specifically, the width of the inner lid member 11 is a dimension obtained by adding the thickness of the spacer 8 to the dimension in the short side direction when viewing the surface of the unit cell 7 where the terminal is present, and the unit cell in the short side direction of the unit cell. Are arranged at the same pitch. The length of the inner lid member 11 is larger than the dimension in the long side direction of the unit cell 7 by a protrusion 58 described later at both ends.

The first inner lid member 11 a includes a central base portion 56, a terminal insulating portion 57 formed higher on both sides of the base portion 56 than the base portion 56, and a protruding portion 58 that falls in the Z direction from the end of the terminal insulating portion 57. It has become.
At the center of the upper surface of the base portion 56, a notch 59 is formed at one side end in the X direction, and a fixing portion 60 comprising a pair of bending arms for fixing the harness to the opposite edge portion of the notch 59. Is formed. In addition, at one end portion of the upper surface of the base portion 56, a first guide portion 61a extending in the Y direction from a position near one side end toward the center, and from the end of the first guide portion 61a toward the other side end. A guide portion 61 including a second guide portion 61b extending in the X direction is formed. Similarly, at the other end of the upper surface of the base portion 56, a first guide portion 61a extending in the Y direction from the position near one side end toward the center, and from the end of the first guide portion 61a to the other side end. A guide portion 61 including a second guide portion 61b extending in the X direction is formed. Moreover, the opening 62 for weight reduction, material reduction, and prevention of a molding defect is formed in the both ends of the base 56. FIG.

  The terminal insulating portion 57 is formed with a notch 63 on one side edge. The notch 63 is located above the terminals 41 and 42 of the unit cell 7 and the half of the terminals 41 and 42 is exposed when the first inner lid member 11 a is mounted on the unit cell 7. It is formed in the position. The reinforcing rib 64 provided on the other side edge of the terminal insulating portion 57 is opposed to the insulating wall 48 of the spacer 8 and engages with one of the engaging holes 49 a and 49 b of the insulating wall 48. Is formed.

  Reinforcing ribs 66 are formed on both side edges in the X direction on the protruding portion 58, and a reinforcing plate 67 is formed by connecting the reinforcing ribs 66 into a box shape. An engaging groove 68 is formed at the upper end of the reinforcing rib 66. A taper 69 tapering downward is formed at the lower ends of both the reinforcing ribs 66.

The second middle lid member 11b is formed mirror-symmetrically with the first middle lid member 11a when viewed in the XY plane, except for the fixing portion 60, the engagement protrusion 65, and the engagement groove 68.
The fixing portion 60 of the base portion 56 of the second inner lid member 11b is formed on the same side edge as the fixing portion 60 of the first inner lid member 11a, but is formed on the opposite side to the center line C in the X direction. ing.
The engagement protrusion 65 of the terminal insulating portion 57 of the second inner lid member 11b is formed on the side edge opposite to the engagement protrusion 65 of the terminal insulating portion 57 of the first inner lid member 11a, and is the center line in the X direction. It is formed far away.
An engagement protrusion 70 that engages with the engagement groove 68 of the first middle lid member 11a is formed on the protrusion 58 of the second middle lid member 11b.

  Next, an assembly procedure of the assembled battery 1 having the above configuration will be described.

  As shown in FIG. 8, the shaft 4 is inserted between the ribs 18 a and 18 b of the stack case 2, a nut 32 is attached to one end of the shaft 4 via the end plate 3 a, and the end plate 3 a is attached to the stack case 2. The other end of the stack case 2 is left open against one end. Since the end plate 3a can be attached after the assembled battery assembly 6 is accommodated, the degree of freedom in assembly is high.

  Next, the engaging claws 50 a and 50 b at the lower end of the spacer 8 are engaged with the engaging holes 53 of the bottom member 9 so that the spacer 8 and the bottom member 9 are integrated, and the unit cell 7 is placed on the bottom member 9. One set of the spacer 8, the bottom member 9, and the unit cell 7 is inserted from the open end of the stack case 2, and the concave portion 54 of the bottom member 9 is engaged with the convex portion 14 of the stack case 2. It is slid in the X direction toward the back of the container and accommodated in the stack case 2. Similarly, one set of all the other spacers 8, the bottom member 9, and the unit cell 7 is accommodated in the stack case 2. A spacer 8 is attached to both ends of the last bottom member 9a so that the unit cell 7 is sandwiched between the two spacers 8 and 8 and accommodated in the stack case 2. The spacers 8 are arranged so that the insulating portions 48 are alternately left and right when viewed from the X direction. In this manner, the insulating wall 48 of the spacer 8 and the terminal side of the assembled battery 1, that is, the Z direction, are arranged in a staggered manner in the direction from the single battery at one end of the assembled battery to the single battery at the other end, that is, in the X direction. The

Here, if the insulating walls 48 of the spacer 8 are not in a staggered arrangement due to misassembly, the engaging claws 50a and 50b of the spacer 8 can be obtained by pulling the insulating wall 48 of the spacer 8 incorrectly arranged upward. Is disengaged from the engagement hole 53 of the bottom member 9, so that only the spacer 8 can be pulled out and can be arranged in the correct direction.
Since the insulating wall 48 is integrally formed on the spacer 8, there is no need to attach the insulating wall 48 separately, the structure around the terminals 41 and 42 is simplified, and only the spacer 8 needs to be attached. Becomes easier.

  After all the spacers 8, the bottom members 9, 9a, and the single cells 7 are accommodated in the stack case 2, the end plate 3b is applied to the open end of the stack case 2, and the nut 32 is attached to the shaft 4 protruding from the end plate 3b. And tighten. At this time, as shown in FIG. 14, since the large diameter portion 35 of the shaft 4 is longer than the length of the stack case 2, the length of the stack case 2 in the X direction is the large diameter portion 35 of the shaft 4 even if the nut 32 is tightened. The stack case 2 will not be crushed. In this case, a gap is generated between the end plates 3 a and 3 b and the stack case 2. Even if this gap exists, as shown in FIG. 14, the protrusions 32 of the first refrigerant inlet 28 and the second refrigerant inlet 29 of the end plate 3a are inserted into the first refrigerant passage, so that the cooling medium leaks from the gap. Can be prevented.

In this way, the cell 7, the spacer 8, and the bottom member 9 are disposed in the stack case 2, and the shaft 4 is inserted into the space between the ribs 18 a and 18 b of the stack case 2, and the stack case 2 is formed by the shaft 4. Only the end plates 3 and 3b are connected and fixed via the connector, the structure of the case is simple, and the case can be assembled easily. When the cell 7, the spacer 8 and the bottom member 9 are accommodated in the stack case 2 and the end plates 3 and 3 b are attached, the internal cell 7, the spacer 8 and the bottom member 9 are all fixed. The bus bar 10, the inner lid members 11a and 11b, the harness, and the like can be easily attached on the unit cell 7.
Further, since the shaft 4 is disposed in a space formed by the ribs 18a and 18b of the left and right wall portions 13a and 13b on both sides of the stack case 2, the size of the shaft 4 affects the size of the assembled battery as a whole. In this way, the assembled battery can be reduced in size.
Furthermore, the strength of the stack case 2 is increased by the shaft 4, and the internal battery can be protected against external force.

  Subsequently, as shown in FIG. 9, the bus bar 10 is attached to the electrodes 41 and 42 of the adjacent unit cells 7, and all the unit cells 7 are connected in series. Next, the inner lid members 11 a and 11 b are mounted on each unit cell 7. At this time, the first middle lid member 11a and the second middle lid member 11b are alternately mounted, the notch 63 and the notch 63 are opposed to each other at one end side, and the engagement projection 65 and the engagement projection 65 are located at the other end side. Try to face each other. Then, the engagement protrusion 65 of the first inner lid member 11 a is engaged with one adjacent engagement hole 49 a of the spacer 8, and the engagement protrusion 65 of the second intermediate lid member 11 b is engaged with the other adjacent engagement of the spacer 8. Engages with the joint hole 49b. Here, even if the second middle lid member 11b is to be mounted on the left and right sides, the engagement projections of the first middle lid member 11a are already in the engagement holes 49b with which the engagement projections 65 of the second middle lid member 11b are engaged. Since 65 is engaged, the second inner lid member 11b cannot be mounted. Thereby, the incorrect assembly | attachment of the inner cover members 11a and 11b can be prevented.

  FIG. 13 shows an insulating structure around terminals 41 and 42 of adjacent unit cells 7 and 7. Since the insulating wall 48 of the spacer 8 is located between the terminals 41 and 42, and the terminal insulating portions 57 of the first inner lid member 11a and the second inner lid member 11b are engaged with the insulating wall 48, In FIG. 13, a long creepage distance from the terminal 41 of the left unit cell 7 to the terminal 42 of the right unit cell 7 is secured, and the terminals 41 and 42 of the adjacent unit cells 7 and 7 are electrically sufficiently insulated. Yes.

  As shown in FIG. 10, the protrusions 58 of the first middle lid member 11 a and the second middle lid member 11 b are inserted between the wall portions 13 a and 13 b of the stack case 2 and the unit cell 7, and thus the unit cell 7. Is prevented from shifting in the Y direction. In order to prevent the cell 7 from shifting in the X direction, an elastic member such as a leaf spring may be interposed between the end plates 3a and 3b and the spacer 8 facing the end plates 3a and 3b.

Next, as shown in FIG. 11, a voltage detection harness is connected to the terminals 41 and 42, and guide grooves formed by the first guide members 61a of the adjacent first middle lid member 11a and second middle lid member 11b are formed. The end plates 3a, 3b are fixed to the fixing portion 60 while being wired along the guide groove formed by the adjacent second guide member 61b, bent at 90 ° at the center, and bent toward the center. It is led out of the stack case 2 through the notch 34.
When the wiring is completed, the stack outer lid 5 is placed in the upper opening of the stack case 2, the attachment pieces 38 of the stack outer lid 5 are stacked on the upper end portions 17 at both ends of the stack case 2, and the insertion pieces 39 of the stack outer lid 5 are placed. Are inserted into the slits 33 of the end plates 3a, 3b and attached by bolting. At this time, the convex portion 40 of the stack outer lid 5 is fitted into a concave portion 71 formed by a step between the base portion 56 of the first inner lid member 11a and the second inner lid member 11b and the terminal insulating portions 57 on both sides thereof. Then, the first middle lid member 11 a and the second middle lid member 11 b are pressed toward the unit cell 7.

  Assembling of the assembled battery 1 is completed as described above, but the assembling procedure is not limited to this, and all the unit cells 7, the spacers 8 and the bottom member 9 are assembled outside the stack case 2, The assembly 6 may be accommodated in the stack case 2 at a time.

  Then, the effect | action of the assembled battery 1 is demonstrated.

  As shown in FIG. 12, the refrigerant introduced into the first refrigerant passage 19 and the second refrigerant passage 20 of the left wall portion 13 a of the stack case 2 passes through the first opening portion 23 and the second opening portion 24 of the inner wall 16, respectively. It flows into the first and second uneven portions 45 and 46 of the spacer 8. While sequentially passing through the first and second uneven portions 45 and 46, the refrigerant cools the adjacent unit cells 7. The refrigerant that has passed through all the first and second uneven portions 45 and 46 of the spacer 4 passes through the third opening 25 and the fourth opening 26 of the right wall portion 13b of the stack case 2 and passes through the third refrigerant passage 21 and the fourth refrigerant. It flows out into the refrigerant passage 22.

1 assembled battery 2 stack case (first case member)
3a End plate (second case member)
3b End plate (third case member)
4 Assembly shaft (connection member)
7 Cell 8 Spacer 13a Left wall portion 13b Right wall portion 15 Outer wall 16 Inner wall 18a, 18b Rib 19 First refrigerant passage 20 Second refrigerant passage 21 Third refrigerant passage 22 Fourth refrigerant passage 35 Large diameter portion (rod-like member)
36 Small diameter part (screw fixing part)
28, 29 Refrigerant inlet 30, 31 Refrigerant outlet 32 Projection

Claims (10)

In the assembled battery in which a plurality of single cells are arranged side by side and accommodated in a case, the case is
A first case member having a bottom portion and wall portions on both sides;
A second case member disposed at one end of the first case member;
A third case member disposed at the other end of the first case member;
A connecting member for connecting the second case member and the third case member via the first case member;
An assembled battery, wherein a space is formed in a wall portion of the first case member, and the connecting member is disposed in the space. The wall portions of the first case member each include an outer wall and an inner wall,
The assembled battery according to claim 1, wherein a rib for connecting the outer wall and the inner wall is provided between the outer wall and the inner wall.   The assembled battery according to claim 2, wherein the rib extends from one end of the wall portion toward the other end.   The assembled battery according to claim 3, wherein a refrigerant passage is formed in the wall portion of the first case member by the rib. A plurality of the ribs are provided,
The assembled battery according to claim 4, wherein a space isolated from the refrigerant passage is formed between two adjacent ribs, and the connecting member is disposed in the space. The connecting member includes a rod-shaped main body, and fastening portions that are thinner than the main body at both ends of the main body.
6. The assembled battery according to claim 1, wherein a length of the main body is greater than a length from one end to the other end of the first case member. Forming a refrigerant inlet in the second case member to communicate with the refrigerant passage of the wall on one side of the first case member;
Forming a refrigerant outlet communicating with the refrigerant passage in the wall on the other side of the first case member in the third case member;
The assembled battery according to claim 4, wherein a protrusion inserted into the refrigerant passage is formed at an opening edge of the refrigerant inlet and the refrigerant outlet. Forming a refrigerant inlet in the second case member to communicate with the refrigerant passage of the wall on one side of the first case member;
Forming a refrigerant outlet communicating with the refrigerant passage in the wall on the other side of the first case member in the third case member;
The assembled battery according to claim 4, wherein a protrusion inserted into the refrigerant inlet and the refrigerant outlet is formed at an end of the refrigerant passage of the first case member. The first case member has wall portions on the bottom and both sides,
The second case member closes an opening at one end of the first case member;
The third case member closes an opening at the other end of the first case member;
The assembled battery according to any one of claims 1 to 8, wherein   The assembled battery according to any one of claims 1 to 9, wherein a spacer is disposed between the single cells.

Images