JP6370256B2 - Power storage module - Google Patents

Description

  The present invention relates to a power storage module, and more particularly to a structure for attaching a cover of a wiring member of a power storage module.

  A power storage module for a vehicle such as an electric vehicle or a hybrid vehicle has a plurality of power storage elements each having a positive electrode electrode and a negative electrode terminal, and the electrode terminals of adjacent power storage elements are connected by a connecting member. Thus, a plurality of power storage elements are connected in series or in parallel. Moreover, in the general electrical storage module, the cover is attached in order to insulate and protect the connection part of a connection member and an electrode terminal (for example, refer patent document 1).

JP 2011-60675 A

  The cover described in Patent Document 1 is configured to simultaneously cover and protect the connection member and the sensor component. This cover prevents interference between the electric wire and the sheet metal outside the battery, and the cover itself does not have a function to insulate between connecting members arranged at adjacent positions, so that the connecting members are insulated. It was necessary to provide a structure to

  In addition, there is usually a tolerance of the electrode pitch in the direction in which the electricity storage elements are arranged in the electricity storage element group, and the tolerance causes a positional shift between the electricity storage element group and the cover. A cover mounting structure that reduces such misalignment has been desired.

  Therefore, the present specification provides a power storage module that improves the reliability of insulation between connection members while reducing the positional deviation between the power storage element group and the cover.

  The power storage module disclosed in the present specification includes a power storage element group in which a plurality of power storage elements having positive and negative electrode terminals are arranged, a plurality of separators separating each power storage element of the power storage element group, and the power storage element group A wiring member having a plurality of connecting members for electrically connecting the electrode terminals and a sheet member for holding the connecting member, and a cover for the wiring member, which is divided into a plurality of divided blocks. A power storage module comprising: a cover; wherein the divided blocks are coupled to the separator, a coupling member that couples adjacent divided blocks to each other, a first coupling member coupled to the separator, and the separator. An insulating rib disposed between the adjacent connection members to prevent contact between the connection members, and the separator includes the first coupling A second coupling member for coupling the timber.

  According to this configuration, each divided block of the cover is coupled to the separator. Therefore, the influence of the variation in the pitch between the electrodes due to the tolerance of the storage element dimensions directly affects the divided blocks. However, the adjacent divided blocks (covers) can be relatively moved by the connecting member. Thereby, it is possible to follow variations in the pitch between the electrodes. At that time, as compared with a configuration in which the divided block is not directly coupled to the separator (power storage element), the positional deviation between the power storage element group and the cover can be reduced. Thereby, the insulating ribs of the divided blocks can be positioned more reliably between the connecting members. Therefore, according to this configuration, it is possible to improve the reliability of insulation between the connecting members while reducing the positional deviation between the power storage element group and the cover.

  In the power storage module, each of the plurality of divided blocks is divided corresponding to a predetermined number of the power storage elements and a predetermined number of the separators, and the separator separates adjacent power storage elements. A separation plate, and a pair of second coupling members provided at both ends of the separation plate, wherein the division block includes the pair of second of one of the predetermined number of the separators. You may make it have a pair of said 1st coupling member corresponding to a coupling member.

According to this structure, the 1st coupling member of a division | segmentation block is provided with respect to one separator among predetermined number of separators. Therefore, the location coupled to the separator in the same divided block can be used as a reference for dealing with variation (following) of the storage elements.
On the other hand, for example, when the first coupling member is coupled to a plurality of separators corresponding to the divided blocks, the coupling of the divided blocks to the separator is strengthened. However, an individual force corresponding to the variation of each storage element acts on the same divided block from each separator. Such individual forces may cause stress on the divided blocks and cause deterioration of the divided blocks such as breakage.

Further, in the power storage module, the divided block has a pair of opposing wall portions, the pair of first coupling members are provided at opposing positions on an outer surface of the pair of wall portions, and the insulating ribs are A reference insulating rib provided at a position facing the one first coupling member on an inner surface of a wall portion where one of the pair of first coupling members is provided, and the second coupling member includes the separation member You may make it provide in the center position of the board thickness direction with respect to a board.
According to this configuration, when the first coupling member is coupled to the second coupling member, the center position of the reference insulating rib in the rib thickness direction and the center position of the separation plate in the plate thickness direction can be aligned. As a result, the reference insulating rib can be disposed at a substantially intermediate position between the adjacent connecting members. Therefore, as compared with the case where the reference insulating rib is not positioned at an almost intermediate position between the adjacent connecting members, the amount of deviation of the other insulating ribs in the same divided block from the intermediate position of the adjacent connecting member can be reduced.

Further, in the above power storage module, the first coupling member and the second coupling member are configured by a fitting structure, the first coupling member has a flange portion, and the second coupling member is the first coupling member. You may make it have a guidance part which guides fitting of a connecting member, and a hook part which a hook part catches when the 1st connecting member is inserted in the guidance part.
According to this structure, the operation | work which couple | bonds a division | segmentation block (cover) to a separator can be made efficient.

  ADVANTAGE OF THE INVENTION According to this invention, the electrical storage module which improves the reliability of the insulation between connection members can be provided, reducing the position shift between an electrical storage element group and a cover.

The perspective view of an electrical storage module provided with the cover of the wiring member concerning one embodiment Plan view of power storage module Partial sectional view taken along line AA in FIG. Perspective view of power storage module with cover removed Top view of power storage module with cover removed Perspective view of wiring member Perspective view of cover Perspective view from the back side of the cover Enlarged view of the first coupling member Perspective view of separator The partial top view which shows the coupling | bonding state of a 1st coupling member and a 2nd coupling member Partial side view showing the position of the reference insulation rib Sectional drawing in the BB line of FIG.

<Embodiment>
An embodiment of the present invention will be described with reference to FIGS.

  The power storage module M1 includes a cover 40 and a separator 50 as shown in FIGS. As illustrated in FIG. 3, the power storage module M <b> 1 includes a power storage element group 10 in which a plurality of power storage elements 11 are arranged. As shown in FIG. 4, the power storage module M <b> 1 includes a wiring member 20.

  The power storage module M1 is used as a drive source for a vehicle such as an electric vehicle or a hybrid vehicle.

  Moreover, in the following description, about the some same member, a code | symbol may be attached | subjected to one member and a code | symbol and description may be abbreviate | omitted about another member.

1. Storage Element Group The storage element group 10 to which the wiring member 20 is attached is configured by arranging a plurality (24 in this embodiment) of storage elements 11 side by side as shown in FIG.

  The power storage element 11 has positive and negative electrode terminal portions 13 protruding vertically from the upper surface of a flat rectangular parallelepiped main body portion 12 (see FIG. 1) in which a power storage element (not shown) is accommodated.

  As shown in FIGS. 3 and 4, each electrode terminal portion 13 includes a disk-shaped terminal block 15 and a cylindrical electrode terminal 14 protruding upward from the terminal block 15. A terminal insertion hole 22 (see FIG. 6) of the bus bar 21 is inserted into each electrode terminal 14. On the side wall portion of the electrode terminal 14, a screw thread (not shown) to which the nut 16 is screwed is formed.

  The bus bar 21 inserted through the electrode terminal 14 and the terminal block 15 come into contact with each other, whereby the bus bar 21 and the electrode terminal 14 are electrically connected. The plurality of power storage elements 11 are arranged so that the polarities of the electrode terminals 14 adjacent in the left-right direction in FIG. 3 are opposite.

2. Wiring member As shown in FIG. 5, the wiring member 20 is attached to the power storage element group 10 along the direction in which the power storage elements 11 are arranged (arrow X direction), and has a function of electrically connecting the plurality of power storage elements 11. . As shown in FIG. 6, the wiring member 20 includes a bus bar 21, a detection electric wire 25, a connector 26, and a sheet member 27.

2-1. The bus bar The bus bar 21 is made of a metal such as copper, copper alloy, stainless steel (SUS), or aluminum, and has a plate shape with a length corresponding to the dimension (electrode pitch) between the adjacent electrode terminals 14 and 14. The bus bar 21 is an example of a connection member. A pair of terminal insertion holes 22 and 22 through which the electrode terminals 14 are inserted are formed through the bus bars 21 other than the bus bar 21A at both upper ends in FIG. Note that only one terminal insertion hole 22 is formed through the bus bar 21A at both upper ends in FIG. The terminal insertion hole 22 has an oval shape that is long in the direction in which the power storage elements 11 are arranged (the direction of the arrow X).

  In addition, as shown in FIG. 6, an electric wire attachment portion 23 to which the detection electric wire 25 is attached is provided protruding from one side edge of the bus bar 21. Further, as shown in FIG. 6, a sheet holding portion 24 for holding the bus bar 21 on the sheet member 27 is provided to protrude at both ends of one side edge of the bus bar 21.

2-2. Detection electric wire The detection electric wire 25 connected to the bus bar 21 detects the state of the electric storage element 11. In addition, in this embodiment, the detection electric wire 25 is for detecting the voltage of each electrical storage element 11, and is connected to the battery ECU (not shown) via the connector 26. The detection electric wires 25 are routed along the direction in which the power storage elements 11 are arranged. In addition, the detection electric wire 25 is not restricted to the detection electric wire for detecting a voltage. Moreover, the detection electric wire 25 does not need to be provided.

  The battery ECU is equipped with a microcomputer, an element, and the like, and has a function for detecting the voltage, current, temperature, etc. of the electricity storage element 11 and controlling the charge / discharge of each electricity storage element 11. It is a thing of composition.

  Although not shown in detail, the detection electric wire 25 is formed by covering the core wire with an insulating coating made of an insulating resin, and the end of the detection electric wire 25 is connected to the bus bar 21 via the electric wire attachment portion 23.

2-3. Sheet Member The sheet member 27 is made of a hard resin insulating material and holds the bus bar 21 and the detection electric wire 25. As shown in FIG. 6, the sheet member 27 is bent by, for example, hot pressing to form wall portions 27 </ b> W and 27 </ b> W.

  Examples of the material of the sheet member 27 include insulating materials such as polyethylene terephthalate (PET), polystyrene (PS), polycarbonate (PC), and polyamide (PA). In the present embodiment, the sheet member 27 is a hard resin sheet such as a polycarbonate sheet. In other words, the sheet member 27 is made of a synthetic resin having no rubber elasticity. As shown in FIG. 6, a plurality of slits 30 that open and close in the long side direction of the sheet member 27 are formed in the sheet member 27. By opening and closing the slit 30, the sheet member 27 made of hard resin can be expanded and contracted in the long side direction (longitudinal direction). Here, the long side direction of the sheet member 27 means a direction along the long side of the sheet member 27 and corresponds to the arrow X direction in FIG. The long side direction of the sheet member 27 and the arrangement direction of the power storage elements 11 are equal.

  Specifically, the sheet member 27 includes at least one pair (five pairs in the present embodiment) of slits (in the present embodiment, five slits) formed from the end along the long side of the sheet member to the end along the opposite long side. 30A, 30B). Each slit 30 is smaller than the width of the sheet member and has a length that is at least half the width of the sheet member.

  Further, in the sheet member 27, a recess 35 cut out in a concave shape is formed at a position corresponding to between the adjacent bus bars 21 and 21 (see FIG. 6). In this way, by forming the recess 35 in the sheet member 27, the creepage distance between the bus bars 21, 21 along the surface of the sheet of the sheet member 27 is increased, thereby allowing the sheet member 27 to pass through the sheet member 27. A short circuit between the bus bars 21 and 21 is prevented. The slit 30 also has a function of increasing the creepage distance of the recess 35.

  Further, as shown in FIG. 6, the sheet member 27 is formed with a holding portion 28 for holding the bus bar 21. As shown in FIG. 6, the bus bar 21 is held by the sheet member 27 by coupling the sheet holding unit 24 of the bus bar 21 to the holding unit 28. Further, the electric wire attaching portion 23 of the bus bar 21 is arranged in the arrangement concave portion 29.

  In addition, the formation aspect of the slit 30 in the sheet | seat member 27 is not restricted to what was shown by FIG. Further, the sheet member 27 is not limited to being configured by a single sheet, and may be configured by being divided into a predetermined number, for example, three.

  Moreover, although the sheet | seat member 27 showed the example used as the shape which forms the space part 27S by wall part 27W, 27W, it is not restricted to this. The shape of the sheet member 27 may be, for example, a planar shape that does not include the wall portions 27W and 27W and the space portion 27S.

3. As shown in FIG. 7, the cover 40 includes a plurality of divided blocks, that is, six divided blocks (41A-41F) in the present embodiment. In the following description, the description of matters common to the respective divided blocks (41A-41F) is referred to as a divided block 41.

  The cover 40 is divided corresponding to a predetermined number of power storage elements 11 and a predetermined number of separators 50. In this embodiment, as shown in FIG. 2 and the like, the four power storage elements 11 and the four separators 50 are divided. The divided block 41A corresponds to five separators 50.

  As shown in FIG. 8, the divided block 41 includes a first coupling member 42, insulating ribs 43, and a connecting member 44. The divided block 41 has a pair of opposing wall portions 47 and 47.

  The divided block 41 is a pair of first coupling members corresponding to a pair of second coupling members 55 (see FIG. 10) of one separator 50 among a predetermined number (four in this embodiment) of the corresponding separators 50. 42, 42. Specifically, as shown in FIG. 2 and the like, the separator 50 is a separator 50 that enters between the first and second ends of the corresponding storage element 11.

  As shown in FIG. 8, the pair of first coupling members 42 and 42 are provided at opposing positions on the outer surfaces 47 </ b> A and 47 </ b> A of the pair of wall portions 47 and 47. As shown in FIG. 9, each first coupling member 42 has a flange portion 42 </ b> A at its distal end, and is coupled to the separator 50 via the flange portion 42 </ b> A.

  The insulating ribs 43 are provided at four locations on the inner side surface 47 </ b> B of the wall portion 47 of the divided block 41. Each insulating rib 43 is disposed between adjacent bus bars 21 when the divided block 41 is coupled to the separator 50, and prevents the bus bars 21 from contacting each other (see FIG. 3). Further, the insulating rib 43 is provided on the inner side surface 47B of one wall portion 47 provided with one of the pair of first coupling members 42, 42 at a position facing the first coupling member 42. The rib 43A is included.

  The connecting member 44 has a function of connecting the adjacent divided blocks 41 so as to be movable in the horizontal direction. That is, as shown in FIG. 8, the connecting member 44 penetrates through the through hole 45 </ b> A of the adjacent divided block 41 when the through part 45 having the through hole 45 </ b> A and the two divided blocks 41 are connected. And a connecting portion 46. When penetrating through the through hole 45A, the connecting portion 46 is not fixed to the through hole 45A. With this configuration, the divided block 41 can move in the horizontal direction following the tolerance of the pitch between the electrode terminals 14 and 14. With this function, it is possible to follow the positional deviation caused by the tolerance of the pitch between the electrode terminals 14 and 14 of the electricity storage element 11.

4). Separator As shown in FIG. 10, the separator 50 includes a separation plate 51, a bottom portion 52, a pair of side plate portions 53 and 53, and a second coupling member 55. Separation plate 51 is located at the center of side plate portions 53 and 53 and bottom portion 52 and separates adjacent power storage elements 11. That is, one power storage element 11 is disposed between the two separators 50.

  As shown in FIG. 10, the separator 50 has a pair of second coupling members 55 at the upper portions of the side plate portions 53, 53, in other words, at both ends of the separation plate 51. The second coupling member 55 is coupled to the first coupling member 42 of the divided block 41.

  The second connecting member 55 includes a guide portion 55A that invites the fitting of the first connecting member 42, and a hook on which the collar portion 42A of the first connecting member 42 is hooked when the first connecting member 42 is fitted into the guide portion 55A. Part 55B (see FIG. 13). That is, in this embodiment, the 1st coupling member 42 and the 2nd coupling member 55 are comprised by the fitting structure.

  The second coupling member 55 is provided at the center position in the plate thickness direction (the arrow X direction in FIG. 11) with respect to the separation plate 51. Further, when the first coupling member 42 is coupled to the second coupling member 55, the center position of the first coupling member 42 matches the center position of the second coupling member 55. Accordingly, as shown in FIG. 11, the central axis CA of the separator 50 (specifically, the separation plate 51) and the central axis CA of the reference insulating rib 43A can be matched.

  Therefore, the reference insulating rib 43A can be positioned substantially at the center of the distance L1 between the adjacent bus bars 21 (see FIG. 12). That is, the reference insulating rib 43 </ b> A can be located at a substantially intermediate position between the adjacent bus bars 21. Therefore, compared with the case where the reference insulating rib 43A is not located at the intermediate position of the adjacent bus bar 21, the amount of deviation of the other insulating rib 43 in the same divided block 41 from the intermediate position of the adjacent bus bar 21 is reduced. it can.

5. Manufacturing method of power storage module 5-1. Manufacturing Method of Wiring Member The sheet member 27 is manufactured by collectively cutting a hard resin sheet by, for example, punching. Specifically, the recesses 35 and the slits 30 are alternately formed at positions between the adjacent bus bars 21 in the direction intersecting with the direction in which the power storage elements 11 are arranged (the direction indicated by the arrow Y in FIG. 6).

  Next, as shown in FIG. 6, the sheet member 27 is deformed by, for example, hot pressing, and the direction substantially perpendicular to the horizontal plane of the first horizontal plane 27A, the second horizontal plane 27B, and the bus bar 21 (arrow Z in FIG. 1). Direction) wall portions 27W, 27W. A space 27S is formed by the walls 27W and 27W (see FIG. 3).

  At the same time as or before and after the processing work of the hard resin sheet, the end of each detection wire 25 is attached to the wire attachment portion 23 of each bus bar 21 by crimping.

  Next, the bus bar 21 to which the detection electric wires 25 are connected is fixed to the holding portion 28 of the sheet member 27 by the sheet holding portion 24 of the bus bar 21. Then, when the detection electric wires 25 are arranged along the wall portions 27W and 27W in the longitudinal direction of the sheet member 27, a wiring member 20 as shown in FIG. 6 is obtained.

5-2. Next, a method for assembling the wiring member 20 to the power storage element group 10 and a method for assembling the cover will be described. The plurality of power storage elements 11 are arranged so that the adjacent electrode terminals 14 have opposite polarities. Next, the separators 50 and the power storage elements 11 are alternately arranged so as to sandwich the power storage elements 11.

  Next, the wiring member 20 is placed on the surface on which the electrode terminal 14 of each power storage element 11 is formed. Since the wiring member 20 according to the present embodiment includes the hard resin sheet member 27 provided with the slits 30, the recesses 35, and the like, the wiring member 20 in the power storage element group 10 can be easily positioned.

  When the wiring member 20 is placed on the power storage element group 10 and each electrode terminal 14 of the power storage element group 10 is inserted into the terminal insertion hole 22 of the bus bar 21, the nut 16 is attached to each electrode terminal 14. 4 is the structure of the power storage module M1.

  At the same time as or before and after assembly of the wiring member, the divided blocks 41 are connected by the connecting members 44 to prepare a cover 40 as shown in FIG. Next, when the first coupling member 42 of each divided block 41 is coupled to the second coupling member 55 of the corresponding separator 50, the power storage module M1 as shown in FIG. 1 is completed.

6). Effects of this Embodiment According to this embodiment, each divided block 41 of the cover 40 is directly coupled to the separator 50. Therefore, the influence of the variation in the pitch between the electrodes due to the tolerance of the storage element dimensions directly affects the divided block 41. However, the adjacent divided blocks 41 can be relatively moved by the connecting member 44. Thereby, it is possible to follow variations in the pitch between the electrodes.

At that time, compared to a configuration in which the divided block 41 is not directly coupled to the separator 50 (power storage element 11), for example, a configuration in which the divided block 41 is coupled to the wiring member 20, the power storage element group 10 and the cover 40 Can be reduced. In other words, the positional deviation can be minimized. Thereby, the insulating rib 43 of the division block 41 can be positioned more reliably between the bus bars 21. In other words, the design for positioning the insulating rib 43 between the bus bars 21 can be made with respect to the minimum value Lmin resulting from the variation in the pitch between the electrodes of the distance L1 between the bus bars shown in FIG.
Therefore, according to the present embodiment, it is possible to improve the reliability of insulation between the bus bars 21 while reducing the positional deviation between the power storage element group 10 and the cover 40.

  Further, according to the present embodiment, the first coupling member 42 of the divided block 41 is provided for one separator among the predetermined number (four) of separators 50. Therefore, in the same divided block 41, the coupling member 44 can follow the variation by using the portion coupled to the separator 50 as a reference for variation correspondence (following) of the storage element 11. On the other hand, for example, when the first coupling member 42 is coupled to the plurality of separators 50 corresponding to the divided block 41, the coupling of the divided block 41 (cover) to the separator 50 is strengthened. However, an individual force corresponding to the variation of each storage element 11 acts on the same divided block from each separator 50. Such individual force becomes stress (stretching force) on the divided block 41 and may cause deterioration of the divided block 41 such as breakage. According to the present embodiment, it is possible to prevent such stress from acting on the divided block 41.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  (1) In the above-described embodiment, the first coupling member 42 is configured to have the flange portion 42A as shown in FIG. 9, and the second coupling member 55 includes the guide portion 55A and the guide portion 55A as shown in FIG. Although it was set as the structure which has the hook part 55B, the structure of the 1st coupling member 42 and the 2nd coupling member 55 is not restricted to this. For example, the second coupling member 55 may be configured not to have the guiding portion 55A.

  Alternatively, contrary to the present embodiment, the first coupling member 42 is configured to have a guide portion and a hooking portion as shown in FIG. 10, and the second coupling member 55 is arranged as shown in FIG. 9. It is good also as a structure which has a part.

  (2) In the above embodiment, as shown in FIG. 6 and FIG. 7, the example in which the first coupling member 42 is provided at the position facing the endmost insulating rib 43 of the divided block 41 has been described. Not limited to. For example, the first coupling member 42 may be provided at a position facing the second insulating rib 43 from the end.

  (3) In the above embodiment, as shown in FIG. 1 and the like, the example in which the second coupling member 55 is provided in each separator 50 has been described, but the present invention is not limited thereto. For example, the second coupling member 55 may be provided only on the separator 50 coupled to the first coupling member 42.

  M1 ... electric storage module, 10 ... electric storage element group, 11 ... electric storage element, 14 ... electrode terminal, 20 ... wiring member, 21 ... bus bar (connection member), 27 ... sheet member, 30 ... slit, 40 ... cover, 41A-41F ... divided block, 42 ... first coupling portion, 42A ... collar portion, 43 ... insulating rib, 43A ... reference insulating rib, 47 ... wall portion, 50 ... separator, 51 ... separating plate, 55 ... second coupling portion, 55A ... Guide part, 55B ... Hook part

Claims (4)

A storage element group in which a plurality of storage elements each having a positive electrode electrode and a negative electrode terminal are arranged;
A plurality of separators for separating each power storage element of the power storage element group;
A wiring member having a plurality of connecting members that electrically connect the electrode terminals of the power storage element group, and a sheet member that holds the connecting members;
A cover for the wiring member, and a cover divided into a plurality of divided blocks, and a power storage module comprising:
The divided block is
A connecting member that allows relative movement of adjacent divided blocks; and
A first coupling member coupled to the separator;
An insulating rib disposed between the connecting members adjacent to each other to prevent contact between the connecting members when coupled to the separator;
The separator is a power storage module having a second coupling member coupled to the first coupling member. Each of the divided blocks of the plurality of divided blocks is divided corresponding to a predetermined number of the storage elements and a predetermined number of the separators,
The separator includes a separation plate that separates adjacent power storage elements, and a pair of second coupling members provided at both ends of the separation plate,
2. The power storage module according to claim 1, wherein the divided block has a pair of first coupling members coupled to correspond to the pair of second coupling members of one of the predetermined number of the separators. . The divided block has a pair of opposing wall portions,
The pair of first coupling members are provided at opposing positions on the outer surfaces of the pair of wall portions,
The insulating rib includes a reference insulating rib provided at a position facing the one first coupling member on an inner surface of a wall portion where one of the pair of first coupling members is provided,
The power storage module according to claim 2, wherein the second coupling member is provided at a central position in a plate thickness direction with respect to the separation plate. The first coupling member and the second coupling member are configured by a fitting structure,
The first coupling member has a collar portion;
The second coupling member is
A guiding portion for guiding the fitting of the first coupling member;
4. The power storage module according to claim 1, further comprising: a hook portion that hooks the flange when the first coupling member is fitted into the guide portion. 5.

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