JP5046513B2 - Pack battery - Google Patents

Description

  The present invention relates to an assembled battery in which a plurality of batteries are arranged in a plurality of rows and stages, and a positioning spacer is provided between the batteries.

  The battery pack can increase the output voltage by increasing the number of batteries connected in series, and can increase the output current by increasing the number of batteries connected in parallel. For this reason, the battery pack has an optimal number of batteries for the application. A battery pack incorporating a large number of batteries has batteries arranged in a plurality of rows and further arranged in a plurality of stages. The battery pack having this structure isolates adjacent batteries from each other in an insulating state, and a positioning spacer is provided between the batteries in order to place the batteries in a fixed position. The positioning spacer is made of an insulating plastic. Plastic positioning spacers are disposed between the batteries to insulate adjacent batteries and prevent battery thermal runaway. Furthermore, the plastic positioning spacer is molded into a shape that holds the battery in place, and places the battery in place.

  Incidentally, a battery pack for holding a battery with a positioning spacer is described in Patent Document 1. In the battery pack described in this patent document, the positioning spacer 22 shown in FIG. 1 is disposed between the batteries. This positioning spacer 22 puts cylindrical batteries in fitting grooves 25 provided on both sides, and stores 14 batteries in 7 rows and 2 stages. In the positioning spacer 22, a plurality of partition walls 23 are integrally formed on both surfaces of the main body portion 24, and the main body portion 24 and the partition wall 23 are provided with fitting grooves 25 that guide the battery to a fixed position.

  The positioning spacer 22 of FIG. 1 can be stacked in a plurality of batteries in two stages and arranged in an insulated state at a fixed position. As shown in FIGS. 2 to 6, the positioning spacer 22 having this structure can be used for a battery pack in which the batteries 21 are stored in four stages. The battery pack shown in these figures uses two sets of positioning spacers 22. One positioning spacer 22 guides the upper two-stage battery 21 to the fitting groove 25 and holds it in place. The other positioning spacer 22 is arranged at a fixed position by inserting the lower two-stage battery 21 into the fitting groove 25. The battery pack of this structure can hold the battery 21 to be inserted into the fitting groove 25 of each positioning spacer 22 in a fixed position, but the relative relationship between the upper two battery groups 26 and the lower two battery groups 27 is relatively high. Misalignment cannot be sufficiently prevented. This is because the insulating spacer 28 is disposed between the upper and lower battery groups, but the insulating spacer 28 cannot dispose the battery 21 in a fixed position. For this reason, it is difficult for the battery pack with this structure to improve vibration resistance and impact resistance.

  The above disadvantages can be eliminated by designing the positioning spacers exclusively. That is, the positioning spacer can be eliminated by forming it into a shape that can accommodate the battery in four stages. However, if a dedicated positioning spacer is used for all battery packs having different numbers of batteries, the manufacturing cost of the positioning spacer increases. This is because when a special positioning spacer is used for all battery packs that are used for various purposes and have different numbers of batteries, the positioning spacers are produced in small quantities.

  This drawback can be solved by the battery pack having the structure shown in FIGS. The battery pack shown in these figures uses three positioning spacers 22 designed to stack the batteries 21 in two stages, and stores the batteries 21 in three stages. However, in the battery pack having these structures, the partition wall 23 of the positioning spacer 22 is lowered as shown in the sectional view of FIG. 7, or the partition wall 23 of the adjacent positioning spacer 22 is removed as shown in FIG. The battery 21 needs to be laminated in two layers.

As shown in FIG. 7, when the positioning spacer 22 for lowering the partition wall 23 is used, the effect of preventing the lateral displacement of the battery 21 positioned above and below in the figure is not sufficient, and the batteries 21 stacked in three stages are firmly connected. There is a drawback that can not be done. As shown in FIG. 8, this drawback can be solved by raising the partition wall 23 and stacking the partition wall 23 in two layers between the batteries 21 in the intermediate stage. However, this structure has a defect that the partition 23 is laminated in two layers between the batteries 21 in the intermediate stage, so that the gap becomes wide and the outer shape of the battery pack becomes large.
JP 2005-197192 A

  The present invention has been developed for the purpose of solving the above drawbacks. An important object of the present invention is that the positioning spacer can be used to stack the batteries in a plurality of rows and stages, and can be arranged in a fixed position, and the number of stacking batteries to be stored can be changed using the positioning spacer of the same shape. In addition, another object of the present invention is to provide a battery pack capable of reducing the outer shape while firmly holding the battery in place.

The battery pack of the present invention has the following configuration in order to achieve the aforementioned object.
In the battery pack, a plurality of batteries 1 are stacked in a plurality of rows and stages, and a positioning spacer 2 is disposed between the batteries 1. The positioning spacer 2 is formed by integrally forming a plurality of partition walls 3 in a main body 4 disposed between the batteries 1 disposed in a plurality of stages, and the partition walls 3 are disposed in a plurality of rows. A fitting groove 5 is provided between the adjacent partition walls 3 so as to accommodate the battery 1 in a fixed position. In the battery pack, the battery 1 is disposed in the fitting groove 5, and the adjacent battery 1 is insulated by the positioning spacer 2 and arranged at a fixed position. The battery pack includes a plurality of positioning spacers 2. Positioning spacers 2 arranged opposite to both sides of a plurality of rows of batteries 1 arranged in the same stage are provided with partition walls 3 facing each other between the batteries 1. The partition walls 3 arranged opposite to each other between the batteries 1 are provided with a fitting convex portion 6 on one side and a fitting concave portion 7 on the other side, and the fitting convex portion 6 is guided to the fitting concave portion 7. to, the partition wall 3 of the positioning spacers 2 which are opposite to each other and connected without overlapping between the battery 1, the thickness of the partition wall 3, Ru thickness der the fitting alignment projection 6.

The positioning spacer 2 can be provided with a plurality of partition walls 3 at regular intervals on both surfaces of the main body 4, and can be positioned between the partition walls 3 provided on one surface, and the partition walls 3 can be provided on the other surface. . In this battery pack, the battery 1 can be arranged in a stacked state by guiding the battery 1 into the fitting groove 5 of the positioning spacer 2.
Further, the positioning spacer 2 makes the partition 3 higher so that the depth of the fitting groove 5 is deeper than half of the battery 1.

  The battery pack of the present invention can be arranged in a fixed position by stacking batteries in a plurality of rows and stages with a positioning spacer, and the number of stacking batteries can be changed using the same positioning spacer. Furthermore, there is a feature that the outer shape can be reduced while holding the battery firmly in place. The battery pack of the present invention includes a plurality of positioning spacers disposed between batteries stacked in a plurality of rows and a plurality of stages, and is disposed opposite to both sides of the batteries disposed in the same stage. The positioning spacer provided is provided with a fitting convex part on one side of the partition wall arranged between the batteries, and a fitting concave part on the other, and guides the fitting convex part to the fitting concave part. This is because the partition walls of the positioning spacers facing each other are connected between the batteries. The battery pack having this structure can guide the fitting projections to the fitting recesses and connect the opposing partition walls without overlapping each other. Therefore, the battery can be held so as not to be laterally displaced by a partition wall in which the insertion convex portions are inserted into the insertion concave portions between the batteries, and the batteries stacked in a plurality of rows and multiple stages can be securely prevented from being laterally displaced. And can be held in place.

  Embodiments of the present invention will be described below with reference to the drawings. However, the example shown below illustrates the battery pack for embodying the technical idea of the present invention, and the present invention does not specify the battery pack as follows.

  Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  The battery pack shown in the sectional view of FIG. 9 includes a plurality of batteries 1 stacked in a plurality of rows and a plurality of stages, a positioning spacer 2 between the batteries 1 and arranging the battery 1 at a fixed position, and a positioning spacer 2. And an outer case 11 that houses a battery assembly 10 that connects the battery 1 in place. Further, the battery pack shown in the figure houses a circuit board 12 in an outer case 11.

  As shown in FIGS. 10 to 13, the battery pack shown in the figure stores cylindrical batteries in seven rows and four stages. However, the battery pack of the present invention does not specify a battery as a cylindrical battery. A square battery can also be used as the battery. Furthermore, the battery 1 is a secondary battery such as a nickel metal hydride battery, a nickel cadmium battery, or a lithium ion secondary battery. The plurality of batteries 1 are arranged in a plurality of rows and a plurality of stages so as to be parallel to each other and so that both end faces thereof are positioned on substantially the same plane. The plurality of batteries 1 are connected to each other in series or in parallel via lead plates 13 with lead plates 13 connected to the electrodes at both ends. The lead plate 13 is welded by a method such as spot welding or laser welding and connected to the electrode of the battery 1. In the illustrated battery pack, seven batteries 1 arranged in the same stage are connected in series, and the batteries 1 arranged in the upper and lower stages are connected in parallel. That is, in this battery pack, the 28 batteries 1 are connected in a straight line with 7 leads by the lead plate 13.

  The lead plate 13 is a metal plate. The lead plate 13 is welded to both ends of the battery 1 to connect the adjacent batteries 1. However, as shown in FIGS. 11 and 12, the lead plate 13 is divided into a plurality of pieces to connect the batteries 1. The lead plate 13 shown in the figure connects four or eight batteries 1. However, the lead plate 13 cannot connect all the batteries 1. The batteries 1 that are not connected by the lead plate 13 are placed in the fitting grooves 5 of the positioning spacers 2 and arranged at fixed positions.

  The lead plate 13 shown in FIG. 11 and FIG. The connection terminal 14 is connected to the circuit board 12. The circuit board 12 is mounted with a control circuit (not shown) that controls charging / discharging of the battery 1. The control circuit detects the voltage of the battery 1 via the lead plate 13 and charges and discharges the battery 1 while preventing overcharge and overdischarge of the battery 1 from the detected battery voltage.

  The positioning spacer 2 is manufactured by integrally molding plastic as an insulating material. The positioning spacer 2 is shown in FIGS. In the positioning spacer 2 shown in these drawings, a plurality of partition walls 3 are integrally formed on a body portion 4 disposed between the batteries 1 disposed in a plurality of stages, and the partition walls 3 are formed in a plurality. A fitting groove 5 is provided between the batteries 1 arranged in a row, and between the adjacent partition walls 3 so that the batteries 1 can be housed in a fixed position. In the positioning spacer 2 shown in the figure, partition walls 3 are provided on both surfaces of the main body portion 4 at regular intervals, and fitting grooves 5 are provided between the adjacent partition wall 3 and the main body portion 4. The battery 1 is guided to the fitting groove 5 and is arranged at a fixed position while insulating the adjacent battery 1 with the positioning spacer 2.

  In the positioning spacer 2 of FIGS. 14 to 16, the inner surface shape of the fitting groove 5 is a shape along the outer shape of the cylindrical battery 1. The positioning spacer 2 holds the outer surface of the cylindrical battery 1 in place with the inner surface of the fitting groove 5 in surface contact. The positioning spacer 2 that holds the battery 1 in surface contact can improve the impact characteristics and vibration characteristics of the battery pack. This is because the battery 1 subjected to vibration or impact collides with the surface of the positioning spacer 2 over a wide area.

  Further, the positioning spacer 2 shown in FIGS. 14 to 16 is provided with the partition walls 3 on both surfaces of the main body 4 and the partition walls 3 on the other surface so as to be positioned between the partition walls 3 provided on one surface. Provided. The positioning spacer 2 guides the battery 1 into the fitting groove 5 and arranges the batteries 1 in a stacked state as shown in FIGS. 9, 10, and 13.

  However, although the battery pack of the present invention is not shown, the batteries can be arranged in a grid pattern. The positioning spacer used for this battery pack is provided with partition walls at opposing positions on both sides of the main body. Positioning spacers with partitions on opposite sides of the main body, or in other words the same position on both sides, guides the battery into the fitting groove and arranges the batteries in a grid pattern, in other words, in a vertical and horizontal matrix. To do.

  The battery packs of FIGS. 9 to 13 use three positioning spacers 2 to stack the batteries 1 in four stages. In the figure, positioning spacers 2 arranged adjacent to each other in the vertical direction are arranged opposite to both sides of a plurality of rows of batteries 1 arranged in the same stage. Further, the positioning spacers 2 arranged on both sides of the battery 1 arranged in the same stage and opposed to each other in the vertical direction are provided with partition walls 3 protruding between the batteries 1 in the vertical direction. The partition walls 3 of the positioning spacers 2 arranged so as to oppose each other are connected to each other on the same plane without overlapping between the batteries 1. In order to realize this, the positioning spacer 2 is provided with a fitting convex portion 6 on one side and a fitting concave portion 7 on the other side, as shown in FIGS. The partition wall 3 of the positioning spacer 2 disposed so as to face the top and bottom is guided by the fitting recess 7 and is connected between the batteries 1 without overlapping.

  In the positioning spacer 2 shown in FIGS. 14 to 16, the fitting convex portion 6 and the fitting concave portion 7 are formed in a quadrangular shape. The fitting convex part and the fitting concave part do not necessarily need to be a quadrangle, and may be a polygon such as a triangle, for example. Moreover, it can also be set as the undercut shape which narrows the width | variety of the root part of a fitting convex part, and the opening part of a fitting recessed part. The partition wall in which the fitting convex part and the fitting concave part have an undercut shape can be connected so that the fitting convex part is inserted into the fitting concave part so as not to come off.

  Since the upper and lower positioning spacers 2 are provided with the fitting projections 6 disposed inside the fitting recesses 7 to connect the partition walls 3, the outer shape of the fitting projections 6 is smaller than the inner shape of the fitting recesses 7. is doing. The positioning spacer 2 shown in the above figures is provided with two sets of fitting convex portions 6 and fitting concave portions 7 on the partition wall 3 provided so as to protrude above and below the main body portion 4. The positioning spacers 2 provided with a plurality of fitting projections 6 and fitting recesses 7 in each partition wall 3 are securely and securely connected so as not to be displaced from each other.

  In the positioning spacer 2 shown in FIGS. 9, 10, and 14 to 16, the partition 3 is raised so that the depth of the fitting groove 5 is deeper than half of the battery 1. This positioning spacer 2 can be inserted into the fitting groove 5 to hold the battery 1 firmly in place. In particular, the battery 1 can be held so as not to be laterally displaced by the partition wall 3 that connects the fitting protrusions 6 in the fitting recesses 7 between the batteries 1. The positioning spacer 2 shown in the figure has a structure in which the depth of the fitting groove 5 provided on both surfaces of the main body 4 is made deeper than half of the battery 1 and more than half of the battery 1 is inserted into the fitting groove 5. The positioning spacer 2 can hold the battery 1 stacked in multiple upper and lower stages firmly in place so as not to be laterally displaced.

  Further, in the battery pack of the present invention, the fitting groove provided on one surface of the main body portion of the positioning spacer can be made deeper than the fitting groove on the other surface. Moreover, the positioning spacer can also make the fitting groove provided on one side of the main body part deeper than half of the battery and make the fitting groove provided on the other side shallower than half of the battery.

  As shown in FIGS. 12 and 14, the positioning spacer 2 shown in FIG. 16 is used upside down to guide the fitting projection 6 provided on the upper and lower partition walls 3 to the fitting recess 7. Link. Therefore, the positioning spacer 2 can be formed in the same shape with plastic so that the fitting convex portion 6 is guided to the fitting concave portion 7.

The battery pack of FIG. 9 is assembled as follows.
(1) The battery 1 is put into the upper and lower fitting grooves 5 of the main body 4 of the lowermost positioning spacer 2, and the batteries 1 are stacked in two stages with the positioning spacer 2 and arranged in a fixed position.
(2) Connect the middle positioning spacer 2 to the lowest positioning spacer 2. The middle positioning spacer 2 is connected to the lowermost positioning spacer 2 between the batteries 1 by guiding the fitting projection 6 to the fitting recess 7.
(3) The battery 1 is guided to the fitting groove 5 on the upper surface of the intermediate positioning spacer 2.
(4) Connect the uppermost positioning spacer 2 to the middle positioning spacer 2. The uppermost positioning spacer 2 is connected to the intermediate positioning spacer 2 between the batteries 1 by guiding the fitting projection 6 to the fitting recess 7.
(5) The battery 1 is guided to the fitting groove 5 on the upper surface of the uppermost positioning spacer 2.
(6) The lead plate 13 is welded and connected to the electrodes at both ends of the battery 1. A plurality of batteries 1 stacked in four stages are connected to a fixed position by a positioning spacer 2 and a lead plate 13 to form a battery assembly 10.
(7) The battery assembly 10 is stored in the inner case 15. The circuit board 12 is disposed on the inner case 15 via the holder 16.
(8) The connection terminal 14 of the lead plate 13 is connected to the circuit board 12.
(9) The battery case 10 is accommodated and the inner case 15 to which the circuit board 12 is connected is put in the outer case 11 and the outer case 11 is closed.

It is a perspective view which shows the positioning spacer arrange | positioned between the batteries of the conventional battery pack. It is sectional drawing which shows the battery pack which accommodates a battery in 4 steps | paragraphs using the positioning spacer shown in FIG. It is sectional drawing which shows the battery assembly of the battery pack shown in FIG. FIG. 4 is a perspective view of the battery assembly shown in FIG. 3. It is a disassembled perspective view of the battery assembly shown in FIG. FIG. 5 is an exploded perspective view of a positioning spacer and an insulating spacer in the battery assembly shown in FIG. 4. It is sectional drawing which shows an example of the structure which laminates | stacks a battery in three steps using the positioning spacer of another structure. It is sectional drawing which shows another example of the structure which laminates | stacks a battery in three steps using the positioning spacer of another structure. It is sectional drawing of the battery pack concerning one Example of this invention. FIG. 10 is a cross-sectional view of the battery assembly of the battery pack shown in FIG. 9. It is a perspective view of the battery assembly of the battery pack shown in FIG. It is a disassembled perspective view of the battery assembly shown in FIG. It is a perspective view which shows the laminated structure of the battery of the battery assembly shown in FIG. It is a disassembled perspective view of the positioning spacer of the battery assembly shown in FIG. It is a perspective view which shows the connection state of the positioning spacer shown in FIG. It is a perspective view of a positioning spacer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Battery 2 ... Positioning spacer 3 ... Bulkhead 4 ... Main-body part 5 ... Insertion groove 6 ... Insertion convex part 7 ... Insertion recessed part 10 ... Battery assembly 11 ... Exterior case 12 ... Circuit board 13 ... Lead board 14 ... Connection Terminal 15 ... Inner case 16 ... Holder 21 ... Battery 22 ... Positioning spacer 23 ... Bulkhead 24 ... Body part 25 ... Insertion groove 26 ... Upper two-stage battery group 27 ... Lower two-stage battery group 28 ... Insulating spacer

Claims (3)

Multiple batteries (1) are stacked in multiple rows and multiple stages, and positioning spacers (2) are arranged between the batteries (1), and the positioning spacers (2) are arranged in multiple stages. A plurality of partition walls (3) are integrally formed in the main body (4) disposed between the batteries (1) to be formed, and the partition walls (3) are formed between the batteries (1) disposed in a plurality of rows. A fitting groove (5) is provided between the adjacent partition walls (3) so that the battery (1) can be stored in a fixed position, and the battery (1) is arranged in the fitting groove (5). A battery pack in which the adjacent battery (1) is insulated by a positioning spacer (2) and arranged at a fixed position,
A positioning spacer (2) provided with a plurality of positioning spacers (2) and opposed to both sides of a plurality of rows of batteries (1) arranged on the same stage is provided on each battery (1). A partition wall (3) is disposed so as to be opposed to each other, and the partition wall (3) facing each other is provided with a fitting convex part (6) on one side and a fitting concave part (7) on the other side, fitting alignment projection (6) is guided into the loading cavity (7) was ligated without overlapping between the battery (1) a partition wall (3) of the opposing positioning spacer (2), partition walls ( thickness of 3) is fitted thickness der Ru battery pack alignment projection (6).
The positioning spacer (2) is provided with a plurality of partition walls (3) at regular intervals on both surfaces of the main body (4), and is positioned between the partition walls (3) provided on one surface and the other surface. The partition wall (3) is provided in the battery, and the battery (1) is guided in the fitting groove (5) of the positioning spacer (2), and the battery (1) is arranged in a stacked state. Item 4. A battery pack according to item 1.
The battery pack according to claim 1 or 2, wherein the positioning spacer (2) has a high partition wall (3) so that the depth of the fitting groove (5) is deeper than half of the battery (1).

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