JP6107570B2 - Battery module and assembling method thereof - Google Patents

Battery module and assembling method thereof Download PDF

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Publication number
JP6107570B2
JP6107570B2 JP2013198623A JP2013198623A JP6107570B2 JP 6107570 B2 JP6107570 B2 JP 6107570B2 JP 2013198623 A JP2013198623 A JP 2013198623A JP 2013198623 A JP2013198623 A JP 2013198623A JP 6107570 B2 JP6107570 B2 JP 6107570B2
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bus bar
bar holding
insulating plate
fitting
battery module
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JP2015065055A (en
Inventor
晃一 梅田
晃一 梅田
啓善 山本
啓善 山本
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株式会社デンソー
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Description

  The present invention relates to a battery module including a plurality of stacked battery cells, a plurality of bus bars that electrically connect the battery cells, and a bus bar holding member that holds the bus bars, and an assembling method thereof. .

  Conventionally, in the bus bar module described in Patent Document 1, a plurality of stacked battery cells are provided with bolts for fastening connection. Moreover, it has an insulating plate for ensuring insulation between battery cells. A plurality of battery cells and insulating plates are stacked to form a battery module. A bus bar made of a conductive metal that connects the battery cells of the battery module is housed in an insulating member. The insulating members are connected by a flexible resin member.

JP 2012-59451 A

  According to the technique disclosed in Patent Document 1, the insulating members in which the bus bars are housed are connected by a flexible resin member. For this reason, it is possible to absorb the stacking tolerance of the battery cells and assemble the bus bar. However, since there is no position restriction on each battery cell and the insulating member, the position of the insulating member is individually adjusted during the assembly. It is necessary to assemble, and it takes time to assemble.

  In addition, when adjusting the position individually, there is a possibility that the bus bars and the bolts forming the electrode terminals of the battery cells may interfere with each other, scratching the current-carrying contact surface of the bus bar and lowering the reliability of current conduction.

  In view of the above problems, an object of the present invention is to provide a battery module in which an insulating member for holding a bus bar can be easily assembled to a plurality of stacked battery cells and an assembling method thereof.

  Descriptions of patent documents listed as prior art can be introduced or incorporated by reference as explanations of technical elements described in this specification.

In order to achieve the above object, the present invention employs the following technical means. That is, in one aspect of the present invention, the battery module (1) includes a plurality of battery cells (2) each having a positive electrode terminal and a negative electrode terminal (3, 4). The battery module (1) includes a plurality of insulating plates (5) provided between the stacked battery cells (2) and a plurality of bus bars (8) that electrically connect the battery cells (2) to each other. ). The battery module (1) includes a plurality of bus bar holding members (9) for fixing each of the bus bars (8) and a connecting portion (12) for connecting adjacent bus bar holding members (9), and is insulated. A fitting part (6, 7, 16) is comprised by fitting with a board (5) and a bus-bar holding member (9).
Moreover, the insulating plate (5) has protrusions (6, 7) orthogonal to the thickness direction of the insulating plate (5). The bus bar holding member (9) is inclined to guide the fitting position of the protrusions (6, 7) with respect to the bus bar holding member (9) when the insulating plate (5) and the bus bar holding member (9) are fitted. A groove (16) having surfaces (17, 18) is provided. Further, when the insulating plate (5) and the bus bar holding member (9) are fitted together, the electrode terminals (6, 7) in the state where the tips of the projections (6, 7) have reached the end of the inclined surface (17, 18). The tips of 3 and 4) are separated from the surface of the bus bar (8).

  According to this invention, the position of the laminated | stacked insulating board and the bus-bar holding member is decided by fitting one side of a fitting part and the other of a fitting part. Therefore, the positions of the electrode terminals of the battery cells and the bus bars are determined, and a battery module in which the bus bar holding member can be easily assembled to the plurality of stacked battery cells is obtained.

  According to the present invention, the projecting portion forming one of the fitting portions can slide on the inclined surface and fit with the other of the fitting portions formed of the groove portions, and the position of the bus bar holding member and the stacked battery cells. Matching is easy.

  According to the present invention, the tip of the electrode terminal is inserted into the bus bar after the protrusion has finished sliding on the inclined surface and the alignment between the bus bar holding member and the stacked battery cell is completed. The surface of the bus bar is not scratched by rubbing against the bus bar.

Next, in the battery module assembling method, the bus bar module (15) is formed by housing the plurality of bus bars (8) in the plurality of bus bar holding members (9) connected by the connecting portion (12). . And this bus-bar module (15) is covered on the laminated body (20) containing the battery cell (2) laminated | stacked and fixed, and the insulating plate (5), and fitting part (6,7,16) One and the other of the fitting parts (6, 7, 16) are fitted.
By fitting one of the fitting portions (6, 7, 16) and the other of the fitting portions (6, 7, 16), the relative position between the insulating plate (5) and the bus bar holding member (9) is determined. It fixes and, as a result, the relative position of an electrode terminal (3, 4) and a bus-bar (8) is fixed. After this fixing, the electrode terminals (3, 4) are inserted into the bus bar (8).

  According to this invention, since one part comprised as a bus-bar module can be covered on a laminated body and it can assemble at a stretch, an assembly | attachment is easy.

  According to this invention, since the electrode terminal is inserted into the bus bar after fixing the relative position between the electrode terminal of the battery cell and the bus bar, the surface of the bus bar is scratched with the electrode terminal, or time is required for assembly. Does not take too much.

  In addition, the code | symbol in parentheses described in a claim and each said means is an example which shows the correspondence with the specific means as described in embodiment mentioned later easily, and limits the content of invention is not.

It is a front view of the battery module which comprises 1st Embodiment of this invention. It is a perspective view which shows a part of battery module in which the some battery cell in the said embodiment was laminated | stacked. It is a perspective view which shows one battery cell in the said embodiment. It is a perspective view which shows one insulating board in the said embodiment. It is a typical perspective view which shows two sets of the bus-bar holding member connected in the said embodiment side by side. It is explanatory drawing which shows the state which inserts a bus bar in the bus-bar holding member in the said embodiment. It is a front view which shows a part of bus bar holding member in the said embodiment. It is explanatory drawing explaining the dimensional relationship between the bus-bar holding member and laminated | stacked battery cell in the said embodiment. It is a partial top view of the bus-bar holding member used for the battery module in 2nd Embodiment of this invention.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. In the case where a part of the configuration is described in each form, the other forms described above can be applied to the other parts of the configuration.

  Not only combinations of parts that clearly indicate that the combination is possible in each embodiment, but also the embodiments are partially combined even if they are not clearly specified unless there is a problem with the combination. It is also possible.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 shows a battery module (also referred to as a battery cell stack) 1 according to a first embodiment of the present invention. Each of the plurality of stacked battery cells 2 includes anode and negative electrode terminals 3 and 4 on one side (upper side in FIG. 1).

  FIG. 2 shows a stacked body 20 of battery cells 2 that is a part of the battery module 1 in which a plurality of battery cells 2 are stacked. In FIG. 2, an insulating plate 5 made of a synthetic resin is provided between the battery cells 2. The insulating plate 5 is made of a rectangular plate-like member, and two protruding portions 6 and 7 (also referred to as one of fitting portions) protruding in one are integrally formed. The insulating plate 5 insulates the battery cells 2 from each other.

  The battery cells 2 are electrically connected to each other by a metal bus bar 8 indicated by a broken line in FIG. Specifically, the electrode terminals 3 and 4 are passed through the two holes of the bus bar 8, tightened with nuts (not shown), and the electrode terminals 3 of the battery cells 2 adjacent in the stacking direction indicated by the arrow Y11 in FIG. 4 are connected by a bus bar, and the battery cells 2 are connected in series.

  Each of the bus bars 8 is housed in a bus bar holding member 9 formed of synthetic resin. The bus bar holding member 9 is a container having one end opened, and the bus bar 8 is placed on the bottom of the container. The bus bar 8 and the bus bar holding member 9 are coupled by a snap action mechanism or the like (not shown).

  FIG. 3 shows one battery cell 2. FIG. 4 shows one insulating plate 5. The battery module 1 is formed by stacking a plurality of battery cells 2 called unit batteries. Each of the battery cells 2 is called a can type, and has positive and negative electrode terminals 3 and 4 above. The battery cells 2 are stacked and pressurized at a constant pressure of 500 kg to 1 ton, and are restrained by a rigid metal restraining body so that the stack 20 of the battery cells 2 does not extend in the stacking direction. As the rigid metal restraining body, a U-shaped restraining band (not shown) and press contact plates at both ends are used. The pressure contact plate is also called an end plate and restrains the stacked body 20 of the battery cells 2 from both sides. As long as the restraining band does not extend, the battery cell 2 does not expand.

  Thereby, the expansion of the battery cell 2 when a current flows through the battery cell 2 is suppressed, and the performance degradation of the battery cell 2 is prevented. The position of each battery cell 2 is slightly different between products due to deviation and dimensional variation during stacking.

  Between the electrode terminals 3 and 4 of the battery cell 2, there is provided a notch portion serving as a smoke exhaust portion (not shown) that is opened when gas is generated in the battery cell 2 and led to a safe place. . The smoke exhaust section is normally closed, but it opens with the pressure of the gas and emits smoke. The exhausted gas is guided into a smoke exhaust duct (not shown) and discharged to a predetermined location. The smoke exhaust duct includes a U-shaped channel made of metal or synthetic resin.

  The plurality of bus bars 8 and the plurality of bus bar holding members 9 are juxtaposed in the stacking direction in order to connect the electrode terminals 3 and 4 of the battery cell 2.

  The bus bar 8 has two terminal coupling holes to which the electrode terminals 3 and 4 of the adjacent battery cells 2 are connected. The electrode terminals 3 and 4 are inserted into the terminal coupling holes and connected. Thereby, the some battery cell 2 is connected in series.

  As described above, the battery cells 2 are stacked and pressurized, and are restrained so as not to extend in the stacking direction by a highly rigid metal restraining band. However, the position of the battery cell 2 varies within the range of dimensional tolerance.

  As described above, the position of each battery cell 2 is slightly different among products due to a dimensional error due to a shift in stacking and a dimensional variation. On the other hand, the bus bar 8 is connected by inserting the electrode terminals 3 and 4 into the terminal coupling holes. Thereby, the dimension error absorption part for aligning the position of the bus bar 8, and the position of the bus bar holding member 9, and the position of each battery cell 2 is required.

  FIG. 5 shows two sets of connected bus bar holding members 9 that are covered one by one from the top of the stacked battery cells 2. In FIG. 5, in order to easily understand the position of the bus bar 8, a part of the bus bar holding member 9 is schematically seen as if it is made of a transparent resin. Actually, since the bus bar holding member 9 is not transparent, a part of the bus bar 8 cannot be seen. FIG. 6 shows a state where the bus bar 8 is inserted into the bus bar holding member 9 as indicated by an arrow Y61.

  A flexible connecting portion 12 is provided between the bus bars 8 having the two terminal coupling holes 10 and 11. The connecting portion 12 is resin-molded integrally with the bus bar holding member 9. The plurality of bus bar holding members 9 are integrated by the connecting portion 12, and the bus bar 8 is accommodated in each bus bar holding member 9. A series of bus bar holding members 9 (a plurality of bus bar holding members 9 connected by the connecting portion 12) in which the bus bars 8 are stored are referred to as a bus bar module 15.

  FIG. 7 shows a part of the bus bar holding member 9. The bus bar holding member 9 is an injection molded product made of synthetic resin. On the side surface of the bus bar holding member 9, a groove portion 16 is formed as the other of the fitting portions 6, 7, 16 that fits with the protruding portions 6, 7 (FIG. 1) as one of the fitting portions 6, 7, 16. Have. The groove 16 has a pair of opposed inclined surfaces 17 and 18. When the protrusions 6 and 7 are inserted into the groove 16, the tips of the protrusions 6 and 7 slide on one of the inclined surfaces 17 and 18, and the protrusions 6 and 7 are guided to the non-inclined surface 19 in the groove 16. .

  The pair of inclined surfaces 17 and 18 have a width that decreases between the inclined surfaces 17 and 18 as the protrusions 6 and 7 are inserted, and the non-inclined surfaces 19 that face each other have a constant width. When the tips of the protrusions 6 and 7 are guided by sliding on the inclined surfaces 17 and 18 and inserted between the non-inclined surfaces 19, the positional relationship between the stacked battery cells 2 and the bus bar holding member 9 is determined.

  The bus bar holding member 9 can be used to fix the bus bar 8 which is a conductive metal for electrically connecting the battery cells 2 to each other, insulate the bus bars 8 from each other, and absorb the stacking tolerance of the battery module 1. It consists of an insulating member provided with the connection part 12 which is a flexible structure. That is, the flexible structure also serves as the connecting portion 12. Moreover, it has the groove part 16 which comprises the other of the fitting parts 6, 7, and 16 in the center between the connection parts 12. FIG. As shown in FIG. 6, the groove portion 16 is formed by opposing ribs that are raised and integrally formed on the side surface of the bus bar holding member 9.

  The insulating plate 5 constituting the battery module 1 has protrusions 6, 7 that are one of the fitting portions 6, 7, 16. The tips of the protrusions 6 and 7 are chamfered as shown in FIG. The bus bar holding member 9 has a groove 16 that is the other of the fitting parts 6, 7, 16. One or both of the protrusions 6 and 7 and the groove 16 have a tapered shape. The tapered shape of this embodiment is formed by the inclined surfaces 17 and 18.

  At the maximum tolerance portion of the battery module 1, the protrusions 6 and 7 that become a guide portion when assembled can be inserted into the groove portion 16 that becomes a guide receiving portion. Moreover, after the assembly, the centers of the protrusions 6 and 7 serving as the guide portion and the groove portion 16 serving as the guide receiving portion coincide.

  As described above, the protrusions 6 and 7 that form one of the fitting portions 6, 7, and 16 function as a guide portion that guides the stacked battery cells. The groove portion 16 constituting the other of the fitting portions 6, 7, 16 functions as a guide portion that guides the bus bar holding member 9. The relationship between the protrusions 6 and 7 and the groove 16 may be reversed. In this case, the protrusions 6 and 7 are provided on the bus bar holding member 9, and the groove 16 is provided on the insulating plate 5.

  The bus bar 8 is managed so that there are no harmful scratches, and there is a concern that harmful scratches may occur due to bolt interference. This scratch includes, for example, generation of burrs due to dents, shaving, or the like, or plating layer scraping when plating is performed.

  The dimensional relationship between the bus bar holding member 9 and the stacked battery cells 2 and the method for assembling the battery module 1 will be described with reference to FIG. FIG. 8 illustrates a state in which the dimension from the upper end 21 of the stacked battery cells 2 to the lower end 22 of the bus bar holding member 9 is D.

  In this state, the tips of the protrusions 6 and 7 are not yet inserted into the groove 16. The length from the upper end 21 of the battery cell 2 to the tips of the electrode terminals 3 and 4 is C. Therefore, in FIG. 8, the length from the lower end 22 of the bus bar holding member 9 to the tips of the electrode terminals 3 and 4 is DC.

  On the other hand, the length from the upper end 21 of the battery cell 2 to the tips of the protrusions 6 and 7 is B. The length from the upper end 21 of the battery cell 2 to the upper ends of the inclined surfaces 17 and 18 of the groove 16 is A. Therefore, the length from the tips of the protrusions 6 and 7 to the upper ends of the inclined surfaces 17 and 18 of the groove 16 is AB.

  When the bus bar 8 and the bus bar holding member 9 are assembled to the laminate 20, the protrusions 6 and 7 start to move toward the groove 16 until the tips of the protrusions 6 and 7 are not guided by the inclined surfaces 17 and 18. The tip moving distance of the protrusions 6 and 7 is AB. The AB is set smaller than the DC.

  According to this dimensional relationship, when the protrusions 6 and 7 are brought close to the bus bar holding member 9 and the dimension A is reduced, the tips of the protrusions 6 and 7 come into contact with the inclined surfaces 17 and 18 and start to slide. When the protrusions 6 and 7 finish sliding on the inclined surfaces 17 and 18 and A-B becomes zero, the protrusions 6 and 7 are inserted into the gap between the non-inclined surfaces 19. As a result, the horizontal position in FIG. 8 between the bus bar holding member 9 and the stacked battery cells 2 is determined. The width E of the protrusions 6 and 7 is slightly smaller than the width F of the gap.

  After AB becomes zero, the tips of the electrode terminals 3 and 4 reach the lower surface position of the bus bar 8. That is, DC becomes zero. That is, after AB becomes zero, DC becomes zero later. Thus, AB is set to be smaller than DC (AB <DC).

  According to this, after the alignment between the bus bar holding member 9 and the stacked battery cells 2 is completed, the tips of the electrode terminals 3 and 4 are inserted into the terminal coupling holes 10 and 11 (FIG. 6) of the bus bar 8. The Therefore, the electrode terminals 3 and 4 do not rub against the bus bar 8 and scratch the surface of the bus bar 8.

  That is, the height until the centers of the protrusions 6 and 7 forming the guide coincide with the center of the groove 16 forming the guide receiving portion is such that the upper end height of the electrode terminals 3 and 4 of the battery cell 2 is the height of the lower surface of the bus bar 8. It means that it is lower than the height to match. Thereby, it can suppress that the electrode terminals 3 and 4 damage the lower surface of the bus-bar 8. FIG.

  Thus, the protrusions 6 and 7 of the insulating plate 5 constituting the battery module 1 constitute a guide portion. The insulating plate 5 is sandwiched between the battery cells 2. The centers of the protrusions 6 and 7 coincide with the center between the stacked battery cells 2. When the bus bar holding member 9 is guided with respect to the stacked battery cells 2 and the protrusions 6 and 7 have been fitted into the groove 16, the center position of the groove 16 is placed with the insulating plate 5 in between. It becomes the center between adjacent battery cells 2.

  The battery module 1 is provided between a plurality of battery cells 2 each having an anode and a negative electrode terminal 3, 4 and the stacked battery cells 2, and one of the fitting portions 6, 7, 16 is formed. The insulating plate 5 is provided.

  The battery module 1 also includes a plurality of bus bars 8 that electrically connect the battery cells 2, and a bus bar holding member 9 that fixes each of the bus bars 8 and has a connecting portion 12 between the bus bars 8. In addition, the battery module 1 is provided integrally with the bus bar holding member 9, and the other of the fitting parts 6, 7, 16 (groove part 16) fitted with one of the fitting parts 6, 7, 16 (protrusion part 6, 7). )have. The positions of the protrusions 6 and 7 and the groove 16 may be reversed.

  According to this, by fitting one of the fitting portions 6, 7, 16 and the other of the fitting portions 6, 7, 16, the positions of the laminated insulating plate 5 and the bus bar holding member 9 are determined. As a result, the positions of the electrode terminals 3 and 4 and the bus bar 8 of the battery cell 2 are also determined.

  Next, one of the fitting parts 6, 7, 16 is composed of protrusions 6, 7 that function as guide parts for guiding the stacked battery cells 2. The other of the fitting portions 6, 7, and 16 includes a groove portion 16 having opposed inclined surfaces 17 and 18 that function as a guide receiving portion for guiding the bus bar holding member 9. According to this, the protrusions 6, 7 constituting one of the fitting parts 6, 7, 16 slide on the inclined surfaces 17, 18 and engage with the other of the fitting parts 6, 7, 16 formed of the groove part 16. be able to.

  Next, the protrusions 6 and 7 start moving toward the groove 16, and the groove 16 extends from the tips of the protrusions 6 and 7, which is a moving distance until the tips of the protrusions 6 and 7 are not guided by the inclined surfaces 17 and 18. The dimension up to the end of the inclined surfaces 17 and 18 is AB. This dimension AB is set smaller than the dimension DC from the tips of the electrode terminals 3 and 4 to the surface of the bus bar 8 when the protrusions 6 and 7 start to move toward the groove 16.

  According to this, after the protrusions 6 and 7 finish sliding on the inclined surfaces 17 and 18 and the alignment between the bus bar holding member 9 and the stacked battery cells 2 is completed, the ends of the electrode terminals 3 and 4 are connected to the bus bar. 8 is inserted.

  Next, the bus bar module 15 in which the plurality of bus bars 8 are housed in the plurality of bus bar holding members 9 connected by the connecting portion 12 is stacked and fixed as shown in FIG. 8 and the insulating plate 5. The laminate 20 is covered from above. In addition, one of the fitting portions 6, 7, 16 and the other of the fitting portions 6, 7, 16 are fitted. According to this, since one part comprised as the bus-bar module 15 can be covered on the laminated body 20 and can be assembled at a stretch, assembly is easy.

  Next, one of the fitting parts 6, 7, 16 and the other of the fitting parts 6, 7, 16 are fitted to fix the relative position between the insulating plate 5 and the bus bar holding member 9, The relative positions of the electrode terminals 3 and 4 of the battery cell 2 and the bus bar 8 are fixed. The electrode terminals 3 and 4 are inserted into the bus bar 8 after the relative position is fixed.

  Therefore, since the electrode terminals 3 and 4 are inserted into the bus bar 8 after the relative positions of the electrode terminals 3 and 4 of the battery cell 2 and the bus bar 8 are fixed, the electrode terminals 3 and 4 are attached to the surface of the bus bar 8. Does not scratch or take too long to assemble.

(Operational effects of the first embodiment)
In the above-described embodiment, the battery module 1 includes a plurality of battery cells 2 each having anode and negative electrode terminals 3 and 4 and a plurality of insulating plates 5 provided between the stacked battery cells 2. And a plurality of bus bars 8 that electrically connect the battery cells 2 to each other. In addition, the battery module 1 includes a plurality of bus bar holding members 9 for fixing each of the bus bars 8 and a connecting portion 12 for connecting the bus bar holding members 9 to each other, and the insulating plate 5 and the bus bar holding member 9 are fitted to each other. The fitting parts 6, 7, and 16 are configured as described above.

  According to this, the position of the laminated | stacked insulating board and the bus-bar holding member is decided by fitting one of the fitting parts 6, 7, and 16 and the other of the fitting parts 6, 7, and 16. Therefore, the positions of the electrode terminals of the battery cells and the bus bars are determined, and a battery module in which the bus bar holding member can be easily assembled to the plurality of stacked battery cells is obtained.

  Next, the insulating plate 5 has protrusions 6 and 7 that are orthogonal to the thickness direction of the insulating plate 5. The bus bar holding member 9 includes a groove 16 having inclined surfaces 17 and 18 that guide the fitting positions of the protrusions 6 and 7 with respect to the bus bar holding member 9 when the insulating plate 5 and the bus bar holding member 9 are fitted. .

  According to this, the protrusions 6 and 7 constituting one of the fitting parts 6, 7 and 16 can be fitted to the other of the fitting parts 6, 7 and 16 including the groove part 16 by sliding on the inclined surface. The bus bar holding member and the stacked battery cells are easily aligned.

  Next, when the insulating plate 5 and the bus bar holding member 9 are fitted to each other, the tips of the electrode terminals 3 and 4 and the bus bar 8 are in a state where the tips of the projections 6 and 7 arrive at the end of the inclined surfaces 17 and 18. The surface is separated.

  According to this, since the tip of the electrode terminal is inserted into the bus bar after the protrusion has finished sliding on the inclined surface and the alignment between the bus bar holding member and the stacked battery cells is completed, the electrode terminal is inserted into the bus bar. The surface of the bus bar will not be scratched by rubbing.

  Next, in the battery module assembling method, the bus bar module 15 is formed by housing the plurality of bus bars 8 in the plurality of bus bar holding members 9 connected by the connecting portion 12. Then, the bus bar module 15 is placed on the laminated body 20 including the stacked and fixed battery cells 2 and the insulating plate 5 and fitted with one of the fitting parts 6, 7, 16 (projections 6, 7). The other of the joint portions 6, 7, 16 (groove portion 16) is fitted.

  According to this, since one part comprised as a bus-bar module can be covered on a laminated body and it can assemble at a stretch, an assembly | attachment is easy.

  Next, one of the fitting parts 6, 7, 16 and the other of the fitting parts 6, 7, 16 are fitted to fix the relative position between the insulating plate 5 and the bus bar holding member 9, The relative positions of the electrode terminals 3 and 4 and the bus bar 8 are fixed. After this fixing, the electrode terminals 3 and 4 are inserted into the bus bar 8.

  According to this, since the electrode terminal is inserted into the bus bar after the relative position between the electrode terminal of the battery cell and the bus bar is fixed, the surface of the bus bar is scratched with the electrode terminal, or time is required for assembly. Don't take too much.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the following embodiments, the same components as those in the first embodiment described above are denoted by the same reference numerals, description thereof is omitted, and different configurations will be described. In addition, about 2nd Embodiment or less, the same code | symbol as 1st Embodiment shows the same structure, Comprising: The description which precedes is used.

  FIG. 9 shows a part of the bus bar holding member 9 in the second embodiment of the present invention. Further, chamfered portions 30 are formed at the four corners of the bus bar 8. Although FIG. 9 illustrates the chamfered portion 30 with the corners cut into straight lines, the chamfered portions 30 may be formed by cutting the corners into curved surfaces.

  In the center portion of the bus bar 8, opposite notches 31 are provided. The convex portion 32 of the bus bar holding member 9 serving as a synthetic resin container is inserted into the notch 31, and the bus bar 8 is held in the bus bar holding member 9. An appropriate clearance is set between the protrusion 32 and the notch 31 of the bus bar holding member 9.

  Since the chamfered portions 30 are formed at the four corners of the bus bar 8, it is easy for the bus bar 8 to slightly tilt or roll in the bus bar holding member 9. Thereby, even if the bus bar holding member 9 is displaced due to torsion of the connecting portion 12 or the like, the bus bar 8 can be easily attached to the electrode terminals 3 and 4 of the battery cell 2 accurately.

(Operational effect of the second embodiment)
In the second embodiment, chamfered portions 30 are formed at the four corners of the bus bar 8 housed in the bus bar holding member 9. Further, the notch 31 at the center of the bus bar 8 is supported by the convex portion 32 of the bus bar holding member 9 via a clearance.

  In other words, the bus bar 8 has a chamfered portion 30 formed by chamfering the four corners of the plate-like body, and a notch 31 formed in the central portion of the bus bar 8. The bus bar holding member 9 has a protrusion 32 that is inserted into the notch 31. In a state where the bus bar 8 is fixed to the bus bar holding member 9, a clearance is formed between the notch 31 and the protrusion 32, and the notch 31 is supported by the protrusion 32.

  According to this, the bus bar 8 can easily roll or tilt in the bus bar holding member 9. Accordingly, the bus bar 8 can be correctly attached to the electrode terminals 3 and 4 even if the bus bar holding member 9 is twisted by the connecting portion 12 or the like.

(Other embodiments)
In the above embodiment, the preferred embodiment of the present invention has been described. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention. It is. The structure of the said embodiment is an illustration to the last, Comprising: The scope of the present invention is not limited to the range of these description. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  In the above embodiment, the connecting portion 12 is flexible. That is, the connecting portion 12 is formed of a soft resin member. For this reason, it is beneficial to reduce the thickness of the resin of the connecting portion 12. It is also beneficial that the connecting portion 12 has a bent portion (vent mechanism) in shape and is easily bent. However, the flexible portion of the connected bus bar holding member may not be provided in the connecting portion 12. In short, a portion of the bus bar holding member 9 may be easily bent or stretched.

DESCRIPTION OF SYMBOLS 1 Battery module 2 Battery cell 3, 4 Electrode terminal 5 Insulation board 6, 7 Protrusion part (one of a fitting part)
6, 7, 16 Fitting part 9 Busbar holding member 12 Connecting part 16 Groove part (the other of the fitting part)
17, 18 Inclined surface

Claims (7)

  1. A plurality of battery cells (2) each having a positive electrode electrode and a negative electrode terminal (3, 4);
    A plurality of insulating plates (5) provided between the stacked battery cells (2);
    A plurality of bus bars (8) for electrically connecting the battery cells (2) to each other;
    A plurality of bus bar holding members (9) for fixing each of the bus bars (8),
    A connecting portion (12) for connecting adjacent bus bar holding members;
    A fitting portion (6, 7, 16) is formed by fitting the insulating plate (5) and the bus bar holding member (9) .
    The insulating plate (5) has protrusions (6, 7) perpendicular to the thickness direction of the insulating plate (5),
    The bus bar holding member (9) is fitted to the bus bar holding member (9) of the protrusions (6, 7) when the insulating plate (5) and the bus bar holding member (9) are fitted. A groove (16) having an inclined surface (17, 18) for guiding the position;
    When the insulating plate (5) and the bus bar holding member (9) are fitted to each other, the tip of the projection (6, 7) has reached the end of the inclined surface (17, 18). The battery module , wherein the tip of the electrode terminal (3, 4) and the surface of the bus bar (8) are separated from each other.
  2. The bus bar (8) has a chamfered portion (30) formed by chamfering four corners of a plate-like body, and a notch (31) formed in the central portion of the bus bar (8),
    The bus bar holding member (9) has a convex part (32) inserted into the notch (31),
    In a state where the bus bar is fixed to the bus bar holding member (9), a clearance is formed between the notch (31) and the convex portion (32), and the notch ( The battery module according to claim 1 , wherein 31) is supported.
  3. The battery module assembling method according to claim 1 or 2 , wherein a plurality of the bus bars (8) are inserted into the plurality of bus bar holding members (9) connected by the connecting portion (12). A bus bar module (15) containing the battery cell (2) and the laminated body (20) including the battery cell (2) and the insulating plate (5) that are stacked and fixed, and the fitting portions (6, 7, 16. A battery module assembling method, wherein one of 16) and the other of the fitting portions (6, 7, 16) are fitted.
  4. By fitting one of the fitting parts (6, 7, 16) and the other of the fitting parts (6, 7, 16), the insulating plate (5) and the bus bar holding member (9) The relative position is fixed, and thus the relative position between the electrode terminal (3, 4) and the bus bar (8) is fixed, and then the electrode terminal (3, 4) is inserted into the bus bar (8). The battery module assembling method according to claim 3 , wherein the battery module is inserted.
  5. A plurality of battery cells (2) each having a positive electrode electrode and a negative electrode terminal (3, 4);
    A plurality of insulating plates (5) provided between the stacked battery cells (2);
    A plurality of bus bars (8) for electrically connecting the battery cells (2) to each other;
    A plurality of bus bar holding members (9) for fixing each of the bus bars (8),
    A connecting portion (12) for connecting adjacent bus bar holding members;
    A battery module assembling method for forming a fitting portion (6, 7, 16) by fitting the insulating plate (5) and the bus bar holding member (9) ,
    The battery cell (2) in which a bus bar module (15) in which a plurality of bus bars (8) are housed in a plurality of bus bar holding members (9) connected by the connecting portion (12) is stacked and fixed. ) And the insulating plate (5), and covers one of the fitting parts (6, 7, 16) and the other of the fitting parts (6, 7, 16). Is a method of fitting,
    By fitting one of the fitting parts (6, 7, 16) and the other of the fitting parts (6, 7, 16), the insulating plate (5) and the bus bar holding member (9) The relative position is fixed, and thus the relative position between the electrode terminal (3, 4) and the bus bar (8) is fixed, and then the electrode terminal (3, 4) is inserted into the bus bar (8). A battery module assembling method comprising inserting the battery module.
  6. The insulating plate (5) has protrusions (6, 7) perpendicular to the thickness direction of the insulating plate (5),
    The bus bar holding member (9) is fitted to the bus bar holding member (9) of the protrusions (6, 7) when the insulating plate (5) and the bus bar holding member (9) are fitted. 6. The battery module assembling method according to claim 5 , further comprising a groove (16) having an inclined surface (17, 18) for guiding the position .
  7. The bus bar (8) has a chamfered portion (30) formed by chamfering four corners of a plate-like body, and a notch (31) formed in the central portion of the bus bar (8),
    The bus bar holding member (9) has a convex part (32) inserted into the notch (31),
    In a state where the bus bar is fixed to the bus bar holding member (9), a clearance is formed between the notch (31) and the convex portion (32), and the notch ( The method of assembling a battery module according to claim 5 or 6 , wherein 31) is supported .
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US10096868B2 (en) 2016-02-23 2018-10-09 Gs Yuasa International Ltd. Energy storage apparatus and method of manufacturing energy storage apparatus
JP6579030B2 (en) * 2016-04-26 2019-09-25 株式会社オートネットワーク技術研究所 Connection module
CN108428944A (en) * 2018-01-29 2018-08-21 惠州市蓝微新源技术有限公司 Battery module structure
JP6709816B2 (en) * 2018-03-14 2020-06-17 矢崎総業株式会社 Busbar module and battery pack

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JP2002134078A (en) * 2000-10-26 2002-05-10 Toyota Motor Corp Cluster battery pack
US20130273404A1 (en) * 2010-10-30 2013-10-17 Sanyo Electric., Ltd Battery pack and vehicle including the same
JP5644523B2 (en) * 2010-12-07 2014-12-24 住友電装株式会社 Battery connector
JP5668555B2 (en) * 2011-03-18 2015-02-12 株式会社オートネットワーク技術研究所 Battery module
JP5745938B2 (en) * 2011-05-30 2015-07-08 株式会社東芝 Secondary battery device
JP5741948B2 (en) * 2011-11-11 2015-07-01 株式会社オートネットワーク技術研究所 Battery wiring module
JP6032897B2 (en) * 2012-01-27 2016-11-30 矢崎総業株式会社 Power Supply

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