JP2016225083A - Battery system and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently connect a multiplicity of bus bars to the electrode terminals of a battery cell by moving the plurality of bus bars to electrode terminal connection positions through a bus bar holder.SOLUTION: A battery system includes: a battery block 16, having laminated battery cells 1, with a terminal surface 11 disposed flush; a bus bar 3 fixed on the electrode terminal 2 of an adjacent battery cell 1, so as to connect the battery cell 1; and a bus bar holder 4 to dispose the bus bar 3 at a regular position. The bus bar 3 is connected to the bus bar holder 4 so that can move from an engagement position to a connection position. The bus bar 3 is disposed at the engagement position. The bus bar holder 4 is disposed between positive and negative electrode terminals 2. The bus bar 3 is moved from the engagement position to the connection position to connect to the electrode terminal 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a battery system in which a plurality of battery cells are connected in series or in parallel via a bus bar, and a manufacturing method thereof.

  The battery system can increase the output voltage by connecting a plurality of battery cells in series, and can increase the charge / discharge current by connecting them in parallel. For example, a battery system for large current and large output used as a power source for a motor that drives an automobile has a plurality of battery cells connected in series to increase the output voltage. In the battery system used for this application, a plurality of battery cells are connected by a metal bar. The bus bar is connected by laser welding to the electrode terminals of the battery cells constituting the battery system. In this connection structure, a notch is provided in the bus bar, the electrode terminal of the battery cell is inserted here, a laser beam is irradiated to the boundary between the inserted electrode terminal and the bus bar, and both the electrode terminal and the bus bar are bounded. Molten and connected.

  In a battery system in which a plurality of battery cells are connected by a bus bar, it is necessary to set a large number of bus bars at fixed positions and perform laser welding. In order to realize this, a battery system has been developed in which a plurality of bus bars are set in place by a bus bar holder. (See Patent Document 1)

JP 2014-10984 A

  In the above battery system, the plurality of bus bars are connected to the bus bar holder so that the bus bars can be moved to some extent. Therefore, the plurality of bus bars can be set at fixed positions via the bus bar holder and connected to the electrode terminals of the battery cells. However, in this battery system, each bus bar is connected to the electrode terminal and the bus bar holder is set at a fixed position of the battery block. Therefore, in order to set the bus bar holder at a fixed position, all the bus bars are connected to the electrode terminals. Must be placed in position. Therefore, in a battery system having a structure in which electrode terminals are inserted into and connected to the through holes of the bus bars, it is necessary to insert the electrode terminals into the through holes of all the bus bars and set the bus bar holders at the fixed positions of the battery blocks. That is, since the bus bar holder is set at the fixed position of the battery block while connecting all the bus bars to the electrode terminals, there is a drawback that the bus bar holder cannot be easily set at the fixed position of the battery block.

  The present invention has been developed for the purpose of solving the above-mentioned drawbacks. An important object of the present invention is that the bus bar holder can be easily set at a fixed position of the battery block, and a plurality of bus bars are moved to the connection position of the electrode terminals via the bus bar holder to efficiently move a large number of bus bars to the battery cell. It is providing the battery system which can be connected to the electrode terminal of this.

Means for Solving the Problems and Effects of the Invention

  The battery system of the present invention includes a battery block 16 in which a plurality of battery cells 1 provided with positive and negative electrode terminals 2 at both ends of a terminal surface 11 are stacked in a posture in which the terminal surfaces 11 are arranged on the same plane; A plurality of bus bars 3 fixed to the electrode terminals 2 of each battery cell 1 constituting the battery block 16 and connected to adjacent battery cells 1, and a bus bar formed by arranging the plurality of bus bars 3 at fixed positions. A battery system comprising a holder 4. The bus bar holder 4 is connected so that the plurality of bus bars 3 can be moved from the locked position to the connected position. The locking position where the bus bar holder 4 connects the bus bar 3 is a position where the bus bar 3 is in the locking position and the bus bar holder 4 is disposed between the positive and negative electrode terminals 2. The bus bar holder 4 is disposed between the positive and negative electrode terminals 2 on the terminal surface 11 of the battery block 16, and is connected to the electrode terminal 2 with the bus bar 3 connected to the bus bar holder 4 as a connection position.

  In the battery system described above, a bus bar holder for arranging a plurality of bus bars at a fixed position can be easily set at a fixed position of the battery block, and further, the plurality of bus bars can be moved to a connection position of electrode terminals via the bus bar holder. There is a feature that it can be efficiently connected to the electrode terminal of the battery cell. That is, the bus bar holder of the above battery system is connected so that a plurality of bus bars can be moved from the locking position to the connecting position, and the locking position for connecting the bus bars is in a state where the bus bar is arranged at the locking position. The bus bar holder is positioned so that it can be placed between the positive and negative electrode terminals, and this bus bar holder is located on the terminal surface of the battery block and is placed between the positive and negative electrode terminals to engage the bus bar connected to the bus bar holder. It is because it moves from a stop position to a connection position and is connected to an electrode terminal.

In the battery system of the present invention, the bus bar holder 4 connects a plurality of bus bars 3 at predetermined intervals on both sides, and moves the bus bars 3 toward both side edges to move from the locking position to the connecting position. Can do.
In the battery system described above, a set of bus bar holders is set on the terminal surface of the battery block, and the bus bar is moved from the bus bar holder so as to protrude on both sides. There is a feature that can connect the bus bar.

In the battery system of the present invention, the bus bar holder 4 can have an elastic arm 41 that holds the bus bar 3 in the locking position, and the elastic arm 41 can have a locking projection 42 that locks the bus bar 3.
The battery system described above has the feature that the bus bar is disposed at the locking position with the elastic arm, so that the bus bar can be securely locked at the fixed position and the bus bar holder can be set on the terminal surface of the battery block.

In the battery system of the present invention, the bus bar holder 4 may have a bus bar guide 43 that guides the bus bar 3 from the locking position to the coupling position.
This battery system is characterized in that the bus bar can be moved from the locking position to the coupling position with the bus bar guide, so that the bus bar can be accurately moved from the locking position to the coupling position and connected to the electrode terminal.

In the battery system of the present invention, the bus bar guide 43 can be a guide wall 44 that is disposed between adjacent bus bars 3.
The battery system can accurately move the bus bar from the locking position to the coupling position with the bus bar guide on the guide wall, and also realizes the feature that the adjacent bus bar can be reliably insulated with the guide wall of the bus bar guide.

In the battery system of the present invention, the bus bar holder 4 is connected to the holder main body 4A so that the bus bar 3 can be moved from the locking position to the connecting position without being detached from the holder main body 4A. A guide cap 45 is provided, and the guide cap 45 can be connected to the holder main body 4 </ b> A so that the bus bar 3 can be connected to the bus bar holder 4.
This battery system has a feature that the bus bar can be easily set at the locking position of the bus bar holder, and in this state, the guide cap can be connected to the holder body and the bus bar can be securely connected to the locking position.

In the battery system of the present invention, the bus bar holder 4 is connected to the holder main body 4A so that the bus bar 3 can be moved from the locking position to the connecting position without being detached from the holder main body 4A. The bus bar 3 can be connected to the bus bar holder 4 by having the guide cap 45 and connecting the guide cap 45 to the guide wall 44 of the holder main body 4A.
The battery system described above is characterized in that the guide cap is connected to the guide wall and the bus bar is disposed at a fixed position so that the adjacent bus bars can be stably insulated.

In the battery system of the present invention, the battery cell 1 has an opening of the discharge valve 19 at the center of the terminal surface 11, and the bus bar holder 4 has a gas discharge duct 46 that is connected to the opening of the discharge valve 19. Can do.
In the battery system described above, the bus bar holder in which the bus bar is disposed at a fixed position is used in combination with the gas discharge duct. Therefore, the gas discharge duct can be provided in the battery block by connecting the bus bar holder to the battery block.

In the battery system of the present invention, the bus bar 3 can have a terminal guide 36 for guiding the electrode terminal 2.
The battery system described above is characterized in that the electrode terminal can be moved to a fixed position of the bus bar by the terminal guide, and the bus bar can be reliably moved to an accurate position and connected to the electrode terminal.

  In the battery system of the present invention, the bus bar 3 can be fixed to the electrode terminal 2 by any one of laser welding, soldering, and screwing.

  The battery system manufacturing method of the present invention is a battery block in which a plurality of battery cells 1 each having positive and negative electrode terminals 2 provided at both ends of a terminal surface 11 are stacked in such a manner that the terminal surfaces 11 are arranged on the same plane. 16 and a plurality of bus bars 3 connected to electrode terminals 2 of each battery cell 1 constituting the battery block 16 and connecting adjacent battery cells 1, and a plurality of bus bars 3 are arranged at fixed positions. A method of manufacturing a battery system including a bus bar holder 4, wherein a bus bar connecting step of arranging a plurality of bus bars 3 on both sides of the bus bar holder 4 at a locking position where the bus bar holder 4 can move to a connecting position with the electrode terminal 2. A bus bar holder setting step for setting a bus bar holder 4 formed by connecting a plurality of bus bars 3 in the bus bar connecting step to the terminal surface 11 between the positive and negative electrode terminals 2. The bus bar moving step of moving the bus bar 3 from the locking position to the connecting position and arranging the bus bar 3 at the connecting position of the electrode terminal 2 in a state where the bus bar holder 4 is arranged at a fixed position in the bus bar holder setting step, A battery system is manufactured by the connection process which fixes the bus bar 3 and the electrode terminal 2 which are arrange | positioned at a fixed position at a movement process.

It is a top view of the battery system concerning one Example of this invention. It is a top view of the battery block of the battery system shown in FIG. It is a front view of a battery cell. It is a top view of the battery cell shown in FIG. It is a top view of the bus-bar holder of the battery system shown in FIG. FIG. 6 is a plan view showing a bus bar of the bus bar holder shown in FIG. 5 and connecting the adjacent battery cells. FIG. 6 is a plan view showing a bus bar of the bus bar holder shown in FIG. 5 and serving as an output terminal. It is a perspective view which shows another example of a bus bar. It is a perspective view which shows another example of a bus bar. It is sectional drawing which shows the process of connecting the bus-bar shown in FIG. 8 to an electrode terminal. It is sectional drawing which shows the state which connects the bus-bar shown in FIG. 9 to an electrode terminal. It is a top view which shows the state which set the bus-bar holder shown in FIG. 5 to the battery block. It is a top view which shows the holder main body of the bus-bar holder shown in FIG. It is a top view which shows the state which connects a bus bar to the holder main body shown in FIG. It is the XV-XV sectional view taken on the line of the holder main body shown in FIG. It is sectional drawing which shows the state which moves the bus-bar set to the bus-bar holder from a latching position to a connection position. It is a vertical cross-sectional view of a guide cap, Comprising: It is a figure corresponded in the XVII-XVII line cross section of FIG. It is a bottom view of the guide cap shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below exemplifies the battery system and the manufacturing method thereof for embodying the technical idea of the present invention, and the present invention does not specify the battery system and the manufacturing method thereof as follows. . Further, this specification does not limit the members shown in the claims to the members of the embodiments.

  The battery system of the present invention is a power source that is mounted on an electric vehicle such as a hybrid car or an electric vehicle and supplies electric power to a traveling motor, a power source that stores generated power of natural energy such as solar power generation or wind power generation, or midnight power It is used for various applications such as a power source that stores electricity and a power source that is mounted on a ship and supplies electric power in place of an auxiliary machine during berthing, and is particularly suitable as a power source suitable for high power and large current applications.

  The battery system shown in the plan view of FIG. 1 includes a battery block 16 in which a plurality of battery cells 1 are stacked and fixed by end plates 14 at both ends, and each battery cell 1 constituting the battery block 16. A bus bar 3 fixed to the electrode terminal 2 and connecting adjacent battery cells 1 and a bus bar holder 4 in which each bus bar 3 is arranged at a fixed position are provided.

  FIG. 2 shows a battery block 16, and the battery block 16 is formed by stacking the battery cells 1 shown in FIGS. This battery cell 1 is a rectangular battery in which positive and negative electrode terminals 2 are provided at both ends of a terminal surface 11. The battery block 16 sandwiches an insulating spacer 17 between the battery cells 1, insulates the battery cell 1 with the insulating spacer 17, and is fixed in a stacked state. The battery cell 1 is a rectangular battery made of a lithium ion battery. However, the battery system of the present invention does not specify the battery cell 1 as a square battery, nor does it specify a lithium ion secondary battery. For the battery cell 1, all batteries that can be charged, for example, non-aqueous electrolyte secondary batteries other than lithium ion secondary batteries, nickel-water battery cells, and the like can be used.

  The battery cell 1 of FIG. 3 and FIG. 4 has the positive / negative electrode terminal 2 fixed to the both ends by the sealing board 12 provided in the terminal surface 11 via the insulating material (not shown). The electrode terminal 2 is provided with a protruding portion 2 </ b> A connected to the bus bar 3. The electrode terminal 2 in the figure has a protruding portion 2A in a cylindrical shape. However, the protrusion 2A does not necessarily have a columnar shape, and although not shown, it can also have a polygonal column shape or an elliptic column shape.

  The plurality of battery cells 1 to be stacked are fixed at fixed positions by fixing parts 13 to form a rectangular battery block 16. The fixed component 13 includes a pair of end plates 14 disposed on both end surfaces of the stacked battery cells 1, and ends connected to the end plates 14 to fix the stacked battery cells 1 in a pressurized state. And the bind bar 15.

  The battery block 16 has a terminal surface 11 on which the electrode terminals 2 of the battery cells 1 are provided, and a sealing plate 12 in FIG. 1 and FIG. Since the battery cell 1 is provided with the positive and negative electrode terminals 2 on both sides of the terminal surface 11, the battery system of FIGS. 1 and 2 has both sides of the terminal surface 11 of the battery block 16 (upper and lower sides in the figure). The positive and negative electrode terminals 2 are disposed along the line. The battery block 16 of FIG. 1 has the adjacent electrode terminals 2 arranged in a row connected by a bus bar 3, and the battery cells 1 are connected in series. However, a battery block can also be arrange | positioned so that a some battery cell may be connected in series and parallel.

  Both ends of the bus bar 3 are connected to the positive and negative electrode terminals 2 to connect the battery cells 1 in series or in parallel. The battery system can increase the output voltage and output current by connecting the battery cells 1 in series to increase the output voltage and connecting the battery cells 1 in series and in parallel.

  The bus bar 3 </ b> A in FIGS. 5 to 7 is provided with a notch portion 31 into which the protruding portion 2 </ b> A of the electrode terminal 2 is inserted. FIG. 6 shows a bus bar 3 that connects adjacent battery cells 1 in series. The bus bar 3 connects two rows of fixed pieces 32 connected to electrode terminals 2 of adjacent battery cells 1 to the rear end. As a shape to be connected by the connecting piece 33, a semicircular cutout portion 31 for guiding the electrode terminal 2 is provided at the distal end edge of the fixed piece 32. The electrode terminals 2 are guided and connected to the respective notches 31. FIG. 7 shows a bus bar 3B serving as an output terminal, in which the output piece 34 is connected to the fixed piece 32 in an L shape in plan view, and the output piece 34 has a screw hole for connecting an output lead (not shown). 35 is provided.

  The bus bars 3C and 3D in FIGS. 8 and 9 have a shape in which the rear end portions of the two fixed pieces 32 are connected by the connecting pieces 33, and are provided at the front end portions of the fixed pieces 32 so as to protrude from the electrode terminals 2. A notch 31 for connecting 2A is defined as a through hole 31A. As shown in FIG. 10, these bus bars 3 </ b> C and 3 </ b> D are connected to the electrode terminal 2 by guiding the protruding portion 2 </ b> A of the electrode terminal 2 into the through hole 31 </ b> A. The through hole 31 </ b> A has an inner shape that can guide the protruding portion 2 </ b> A of the electrode terminal 2. In the bus bar 3D of FIGS. 9 and 11, the through-hole 31A is a tapered flare portion 31a. The flare portion 31a is a tapered surface that increases its inner shape toward the upper opening. This bus bar 3D can irradiate a laser beam along the boundary between the flare portion 31a and the electrode terminal 2 to reliably connect the bus bar 3 to the electrode terminal 2.

  Furthermore, the bus bars 3C and 3D shown in these drawings are provided with a terminal guide 36 for guiding the electrode terminal 2 to the through hole 31A. The bus bars 3C and 3D are pressed so that the metal plate bus bars 3C and 3D protrude from the upper surface and the step recesses 36A are provided on the lower surface, and the terminal guides 36 are provided by the step recesses 36A. The stepped recess 36A of the terminal guide 36 is a U-shaped groove whose width increases toward the tip of the fixed piece 32, and a through hole 31A for guiding the electrode terminal 2 to the center of the semi-elliptical U-shaped groove. Is provided.

  The bus bar 3 is disposed at a fixed position by the bus bar holder 4, and guides the protruding portion 2 </ b> A of the electrode terminal 2 to the notch 31. The bus bar holder 4 is formed of an insulating material such as plastic, and the bus bar 3 is arranged at a fixed position by a fitting structure. The bus bar holder 4 is connected to the battery block 16 to place the bus bar 3 in a fixed position. The bus bar holder 4 is connected to an insulating separator 17 stacked between the battery cells 1 and arranged at a fixed position, or connected to the battery cell 1 and connected to a fixed position of the battery block 16.

  The bus bar 3 is disposed at a fixed position by the bus bar holder 4 and connected to the electrode terminal 2. The bus bar holder 4 arranges each bus bar 3 in an insulated state. Accordingly, the bus bar holder 4 is made of an insulating material such as plastic. The bus bar holder 4 made of plastic is manufactured by molding a thermoplastic resin. The bus bar holder 4 is connected so that the bus bar 3 can be moved from the locked position to the connected position. FIG. 12 shows the bus bar holder 4 in which the bus bar 3 is arranged at the locking position. As shown in FIGS. 1 and 12, the bus bar holder 4 is disposed between the positive and negative electrode terminals 2 on the terminal surface 11 of the battery block 16. As shown in FIG. 12, the bus bar holder 4 is set between the positive and negative electrode terminals 2 with the bus bar 3 disposed at the locking position. Therefore, the locking position at which the bus bar holder 4 connects the bus bar 3 is a position at which the bus bar 3 can be disposed between the positive and negative electrode terminals 2 by arranging the bus bar 3 at the locking position. The bus bar holder 4 has a width (W) narrower than the interval between the positive and negative electrode terminals 2 in a state where the bus bar 3 is disposed at the locking position. The bus bar holder 4 is arranged on the terminal surface 11 of the battery block 16 with each bus bar 3 placed at the locking position, and is set at this position to move the bus bar 3 from the locking position to the coupling position, that is, The bus bar 3 protrudes on both sides of the bus bar holder 4 and is connected to the electrode terminal 2.

  13 and 14 show plan views of the bus bar holder 4, and FIG. 14 shows a state in which a part of the bus bars 3 is set at the locking position. These bus bar holders 4 arrange a plurality of bus bars 3 in two rows along both sides. The bus bars 3 arranged on both sides are insulated from the adjacent bus bar 3 and arranged in a straight line at a constant interval. As shown in FIGS. 12 and 1, the bus bar holder 4 moves the bus bars 3 arranged in two rows on both sides from the locking position to the coupling position, and moves each bus bar 3 to both sides of the bus bar holder 4. It protrudes from the edge and is connected to positive and negative electrode terminals 2 arranged on both sides. Therefore, one bus bar holder 4 can be set on the terminal surface 11 of the battery block 16, and the bus bar 3 can be connected to the electrode terminals 2 disposed on both sides of the terminal surface 11 of the battery block 16. In this battery system, one bus bar holder 4 is set on the battery block 16, and the bus bar 3 can be connected to the electrode terminals 2 arranged on both sides of the terminal surface 11 of the battery block 16. However, in the battery system of the present invention, although not shown, the bus bar holders can be arranged in two rows between the positive and negative electrode terminals. In this bus bar holder, the bus bars are arranged in one row, and the bus bars protrude from one side.

  As shown in the sectional view of FIG. 15, the bus bar holder 4 is provided with an elastic arm 41 that holds the bus bar 3 in the locking position. This sectional view is a sectional view taken along line XV-XV in FIG. The elastic arm 41 is integrally formed with the bus bar holder 4 with plastic. The elastic arm 41 extends in the moving direction of the bus bar 3 that is moved from the locking position to the connecting position, connects the rear end to the bus bar holder 4, and locks the bus bar 3 to the front end portion. A locking projection 42 for locking is provided. The elastic arm 41 is provided between the fixed pieces 32 provided on both sides of the bus bar 3, and the connecting piece 33 of the bus bar 3 is hooked by the locking projection 42 at the tip, and is arranged at the locking position. Since the bus bar holder 4 shown in FIGS. 13 to 15 has the elastic arm 41 disposed on the lower side of the bus bar 3, the latching convex portion 42 is provided so as to protrude upward. As shown in FIG. 16, the elastic arm 41 is pushed down when the bus bar 3 is moved from the locking position to the coupling position, and releases the locked state of the bus bar 3.

  The bus bar holder 4 of FIGS. 13 and 14 is provided with a bus bar guide 43 between the adjacent bus bars 3 for guiding the bus bar 3 from the locking position to the coupling position. The bus bar guide 43 is a guide wall 44 provided between the bus bars 3, and the bus bar 3 is moved along the bus bar guide 43 of the guide wall 44 to move from the locking position to the coupling position. In addition, the bus bar guide 43 on the guide wall 44 functions to insulate the bus bar 3 between the adjacent bus bars 3. The guide wall 44 of the bus bar guide 43 is a ridge extending from the central part of the bus bar holder 4 to both sides, and moves the bus bar 3 from the central part to both sides to move from the locking position to the coupling position.

  Further, the bus bar holder 4 of FIGS. 13 and 14 is connected to the plastic holder main body 4A and the holder main body 4A so as to prevent the bus bar 3 from easily falling off. And a plastic guide cap 45 connected so as not to come off. The guide cap 45 is arranged so that the bus bar 3 can be moved from the locking position to the coupling position and is not detached from the holder body 4A. The guide cap 45 is fixed to the holder body 4A by setting the bus bar 3 at the locking position of the holder body 4A.

  The bus bar holder 4 in FIGS. 13 to 16 has a guide cap 45 fixed to the upper surface of a guide wall 44 provided in the holder body 4A. In order to fix the guide cap 45, a fitting convex portion 44 a is provided on the upper surface of the guide wall 44. As shown in the cross-sectional view of FIG. 17 and the bottom view of FIG. 18, the guide cap 45 is provided with a fitting hole 45 a into which a fitting projection 44 a provided on the upper surface of the guide wall 44 is inserted. The guide cap 45 is connected to the holder body 4A by inserting the fitting convex portion 44a into the fitting hole 45a. With this structure, the guide cap 45 can be fixed to the holder body 4A easily and accurately.

  In order to slide the bus bar 3 from the locking position to the coupling position, the guide cap 45 has two rows of ridges 45b on both sides of the lower surface as shown in the sectional view of FIG. 17 and the bottom view of FIG. Is provided. The protrusions 45b are provided in parallel, the lower end surface is brought close to the surface of the bus bar 3, and the bus bar 3 is moved along the guide wall 44 from the locking position to the coupling position.

  Further, the bus bar holder 4 of FIGS. 13 to 15 is provided with a gas discharge duct 46 for discharging the gas ejected outside when the discharge valve 19 of the battery cell 1 is opened to the outside. The gas discharge duct 46 includes a pair of opposing walls 47 provided so as to extend in the longitudinal direction along the central portion of the bus bar holder 4 and a lid portion (not shown) that closes the upper surface of the opposing wall 47. Thus, the groove is open at the bottom. The gas discharge duct 46 connects the lower opening 48 to the opening 18 of the discharge valve 19 and exhausts the gas discharged from the discharge valve 19 of the battery cell 1 to the outside.

  The bus bar 3 set in the bus bar holder 4 is connected to a lead wire 5, and a connector 6 is connected to the tip of the lead wire 5. The lead wire 5 is connected via a connector 6 to a protection circuit (not shown) provided in the battery system. The protection circuit detects the voltage of each battery cell 1 connected to the bus bar 3 via the lead wire 5 and controls the charge / discharge current so as to prevent overcharge and overdischarge of the battery cell 1. . The lead wire 5 is connected to the bus bar 3 by soldering or caulking structure. In the battery system in which the lead wire 5 is connected to the bus bar 3 in order to detect the voltage of the battery cell 1, the work for wiring the lead wire 5 in a state where a high voltage is applied requires many man-hours for ensuring safety. However, in the battery system described above, the lead wire 5 is connected to each bus bar 3 set in the bus bar holder 4, so the lead wire 5 is connected to the bus bar 3. The wiring work is extremely efficient and safe.

The above battery system connects the electrode terminal 2 to the bus bar 3 in the following steps.
(1) Bus bar connecting step The guide cap 45 is removed, the bus bar 3 is set in the holder main body 4A, and then the guide cap 45 is fixed to the holder main body 4A, and the bus bar 3 is disposed at the locking position of the bus bar holder 4. . In this state, the bus bar 3 is arranged at the locking position by the elastic arm 41.

(2) Bus bar holder setting step The bus bar holder 4 in which the bus bar 3 is arranged at the locking position is arranged between the positive and negative electrode terminals 2 on the terminal surface 11 of the battery block 16. The bus bar holder 4 is fixed to the end plate and disposed at a fixed position of the battery block 16. The battery block 16 is assembled by stacking the battery cells 1 with the insulating spacers 17 between the battery cells 1, arranging the end plates 14 on both end faces, and connecting the end plates 14 with the bind bars 15.

(3) Bus Bar Moving Step The bus bar 3 at the locking position of the bus bar holder 4 is moved to the connecting position, and the protruding portion 2A of the electrode terminal 2 is guided to the notch 31 of the bus bar 3. The bus bar 3 is moved so as to protrude on both sides of the bus bar holder 4 and is moved to the coupling position. At this time, the elastic arm 41 is pressed to release the locked state of the elastic arm 41, and the bus bar 3 is moved from the locked position to the connected position. All the elastic arms 41 are pressed together to release the locked state of all the bus bars 3 and move the bus bars 3 to the connection position. The elastic arm 41 can release the locked state by, for example, pressing the root portion with a comb-shaped pressing tool (not shown) or pressing the tip portion together. Further, since all the bus bars 3 can be moved in the same direction and arranged at the connection position, they can be pushed out from the locking position to the connection position by a comb-shaped pusher (not shown).

  Since the bus bars 3C and 3D in FIGS. 8 and 9 are provided with the terminal guides 36, the bus bars 3C and 3D are pushed down as shown by the arrows in FIG. As shown in FIG. 10B, it is moved in the direction indicated by the arrow in FIG. 10B, moved from the locking position to the connecting position, and placed at the connecting position shown in FIG. 10C and FIG.

(4) Connection process A laser beam is irradiated to the boundary between the bus bar 3 and the electrode terminal 2 to fix the bus bar 3 to the electrode terminal 2 by laser welding. In the process of welding the bus bar 3 to the electrode terminal 2, the bus bar 3 can be pressed against the electrode terminal 2 to be welded more reliably.

  In the battery system described above, the electrode terminal 2 is fixed to the bus bar 3 by laser welding. However, the battery system of the present invention does not necessarily require the bus bar 3 to be fixed to the electrode terminal 2 by welding. For example, a male screw can be installed on the electrode terminal and inserted into the bus bar, and a nut can be screwed in and fixed to the male screw of the electrode terminal, and a set screw that passes through the bus bar can be screwed into the electrode terminal and fixed with a set screw. This is because the electrode terminal can be fixed by soldering.

  The battery system of the present invention can be suitably used as a power source for an electric vehicle, a natural energy storage, or a power source for storing midnight power by efficiently and stably connecting the electrode terminals of the battery cells and the bus bar.

DESCRIPTION OF SYMBOLS 1 ... Battery cell 2 ... Electrode terminal 2A ... Protruding part 3 ... Bus bar 3A, 3B, 3C, 3D ... Bus bar 4 ... Bus bar holder 4A ... Holder main body 5 ... Lead wire 6 ... Connector 11 ... Terminal surface 12 ... Sealing plate 13 ... Fixed Component 14 ... End plate 15 ... Bind bar 16 ... Battery block 17 ... Insulating spacer 18 ... Opening 19 ... Drain valve 31 ... Notch 31A ... Through hole 31a ... Flare 32 ... Fixed piece 33 ... Connecting piece 34 ... Output piece 35 ... Screw hole 36 ... Terminal guide 36A ... Step recess 41 ... Elastic arm 42 ... Locking projection 43 ... Bus bar guide 44 ... Guide wall 44a ... Fitting projection 45 ... Guide cap 45a ... Fitting hole 45b ... Round 46 ... Gas exhaust duct 47 ... opposing wall 48 ... opening

Claims (11)

A battery block in which a plurality of battery cells provided with positive and negative electrode terminals at both ends of a terminal surface are stacked in a posture in which the terminal surfaces are arranged in the same plane;
A plurality of bus bars fixed to the electrode terminals of each battery cell constituting the battery block and connecting the adjacent battery cells;
A battery system comprising a bus bar holder in which a plurality of bus bars are arranged at fixed positions,
The bus bar holder is connected so that a plurality of the bus bars can be moved from a locking position to a connecting position,
Further, the locking position at which the bus bar holder connects the bus bar is a position where the bus bar is at the locking position and the bus bar holder is disposed between the positive and negative electrode terminals,
A battery system in which the bus bar holder is disposed between the positive and negative electrode terminals on the terminal surface of the battery block, and the bus bar connected to the bus bar holder is connected to the electrode terminal at the connecting position. . The battery system according to claim 1,
The bus bar holder connects a plurality of the bus bars at predetermined intervals on both sides, and the bus bar is moved toward both side edges so as to be moved from the locking position to the connecting position. A battery system characterized by comprising: The battery system according to claim 1 or 2,
The battery system, wherein the bus bar holder includes an elastic arm that holds the bus bar in a locking position, and the elastic arm includes a locking projection that locks the bus bar. A battery system according to any one of claims 1 to 3,
The battery system, wherein the bus bar holder includes a bus bar guide for guiding the bus bar from the locking position to the coupling position. A battery system according to claim 4, wherein
A battery system in which the bus bar guide is a guide wall formed between adjacent bus bars. A battery system according to any one of claims 1 to 5,
The bus bar holder has a holder body and a guide cap connected to the holder body to connect the bus bar from the locking position to the connection position so as not to be detached from the holder body; A battery system in which a guide cap is connected to the holder body, and the bus bar is connected to the bus bar holder. The battery system according to claim 5, wherein
The bus bar holder has a holder body and a guide cap connected to the holder body to connect the bus bar from the locking position to the connection position so as not to be detached from the holder body; A battery system in which a guide cap is connected to an upper surface of the guide wall of the holder body, and the bus bar is connected to the bus bar holder. The battery system according to any one of claims 1 to 7,
The battery cell has a discharge valve opening at the center of the terminal surface;
A battery system having a gas discharge duct in which the bus bar holder is connected to an opening of the discharge valve. A battery system according to any one of claims 1 to 8,
A battery system in which the bus bar has a terminal guide for guiding the electrode terminal. A battery system according to any one of claims 1 to 9,
A battery system in which the bus bar is fixed to the electrode terminal by laser welding, soldering, or screwing. A battery block in which a plurality of battery cells provided with positive and negative electrode terminals at both ends of a terminal surface are stacked in a posture in which the terminal surfaces are arranged in the same plane;
A plurality of bus bars connected to the electrode terminals of each battery cell constituting the battery block and connecting the adjacent battery cells;
A battery system manufacturing method comprising a bus bar holder for arranging a plurality of the bus bars at fixed positions,
A bus bar connecting step of disposing a plurality of bus bars on both sides of the bus bar holder and disposing the bus bar to a connecting position with the electrode terminal,
A bus bar holder setting step of setting the bus bar holder formed by connecting a plurality of bus bars in the bus bar connecting step between the positive and negative electrode terminals and on the terminal surface;
In a state where the bus bar holder is disposed at a fixed position in the bus bar holder setting step, the bus bar is moved from the locking position to the coupling position, and the bus bar is disposed at the coupling position of the electrode terminals,
A battery system manufacturing method comprising: a connecting step of fixing the bus bar and the electrode terminal arranged at a fixed position in the bus bar moving step.

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