JP2014022134A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack in which unit cells are insulated electrically by inserting a rib between adjoining unit cells, and propagation of an impulsive force between unit cells can be suppressed.SOLUTION: The end face (outer surface of a sealing plate) 153a of a unit cell 153 and the end face (bottom surface of an outer can) 154b of a unit cell 154 are facing each other while being separated. A rib 121 inserted between the end face (outer surface of a sealing plate) 153a of a unit cell 153 and the end face (bottom surface of an outer can) 154b of a unit cell 154 has a first rib 121a and a second rib 121b. The first rib 121a and second rib 121b are placed at an interval in the X axis direction, and extended like a screen in the Y axis direction. The rib 121 also has a third rib 121f extended in the X axis direction. A notch 121g is provided on the upper side of the third rib 121f in the Z axis direction.

Description

  The present invention relates to a battery pack, and particularly to a structure of a partition wall interposed between adjacent unit cells.

  A battery pack including a plurality of unit cells is used as a power source for mobile devices such as a mobile TV receiver and a tablet personal computer, and a vehicle such as a hybrid electric vehicle (HEV) and a power-assisted bicycle (patent) Reference 1). In the battery pack, ribs are inserted between adjacent unit cells with respect to a plurality of unit cells housed inside the case (Patent Documents 2 and 3). The rib is inserted as a partition for electrically insulating the unit cells. The rib configuration in the battery pack according to the prior art will be described with reference to FIG.

As shown in FIG. 11A, a linear rib 921 is interposed between the unit cell 953 and the unit cell 954. For example, the rib 921 is erected from the inner surface of the bottom wall of the case member constituting the exterior of the battery pack, and is integrally formed as a part of the case member using an insulating material. A side view of the part indicated by the arrow G is shown in FIG.
As shown in FIG. 11 (b), one end surface (sealing plate outer surface) of the unit cell 953 and one end surface (outer can bottom surface) of the unit cell 954 are both in close contact with the surface of the rib 921. Yes. For this reason, in the X-axis direction, the unit cells 953 and the unit cells 954 are arranged apart from each other by the plate thickness of the rib 921.

  Thus, in the battery pack according to the prior art, the rib 921 is provided in order to achieve electrical insulation between the unit cells 953 and 954 housed inside.

JP 2000-31667 A JP 2001-307695 A JP 2010-73691 A

However, in the battery pack according to the prior art, the influence of impact such as dropping or vibration may propagate between the internal unit cells and damage the unit cells. Specifically, as shown in FIG. 11B, when an impact is applied from the outside due to dropping or the like, the unit cell 954 vibrates as indicated by an arrow H ₁ , and the force is applied in the plate thickness direction of the rib 921. Propagation also to the unit cell 953, and the unit cell 953 may also vibrate as indicated by an arrow H ₂ .

The propagation of the impact force as described above is considered to cause damage to the connection portion between the unit cell and the lead plate, the connection portion between the lead plate and the circuit board, and chip components on the circuit board.
Such damage is considered to be largely due to the influence of the impact force propagated from the end surface of the unit cell to the end surface of the unit cell.

  The present invention has been made to solve the above-described problems, and by interposing a partition wall between adjacent unit cells, it is possible to achieve electrical insulation between the unit cells and to provide an impact force. It aims at providing the battery pack which can suppress that it propagates between unit cells.

The present invention employs the following configuration to achieve the above object.
The battery pack according to the present invention includes an exterior body, and a first unit cell and a second unit cell housed in the exterior body. The first unit cell has an outer shape composed of a first end surface and a second end surface that face each other and a side peripheral surface that surrounds the side periphery, and the second unit cell has a third end surface that faces each other. And the external shape is comprised by the 4th end surface and the side surrounding surface surrounding a side periphery. The first unit cell and the second unit cell are one end surface of the first end surface or the second end surface of the first unit cell (hereinafter also referred to as “first unit cell end surface”), and the second unit cell. The third end surface or the fourth end surface of the first end surface (hereinafter also referred to as “second unit cell end surface”) is disposed so as to face each other with a space therebetween. A partition made of an insulating material is interposed between the first unit cell end surface of the first unit cell and the second unit cell end surface of the second unit cell.

  The partition walls are spaced apart from each other in a direction orthogonal to the first unit cell end surface of the first unit cell, and are along the first unit cell end surface of the first unit cell and the second unit cell end surface of the second unit cell. It has the 1st partition part and the 2nd partition part extended and formed in the shape of the screen in the direction. The first partition wall is disposed closer to the end surface of the first unit cell than the second partition wall, and the second partition wall is the second partition cell than the first partition wall. It is arranged on the end face side of the two unit cells.

  In the battery pack according to the present invention, the partition interposed between the first unit cell end surface of the first unit cell and the second unit cell end surface of the second unit cell includes the first partition unit and the second partition unit. The first partition wall portion and the second partition wall portion are spaced apart from each other in a direction orthogonal to the first cell end face of the first cell. Therefore, a space is provided between the first unit cell end surface of the first unit cell and the first unit cell end surface of the second unit cell, and even when an impact force is applied from the outside, The space functions as a region that reduces the impact.

In the battery pack according to the present invention, since the partition including the first partition and the second partition is made of an insulating material, electrical insulation between the first unit and the second unit is achieved. Of course you can.
As described above, in the battery pack according to the present invention, by inserting a partition wall between adjacent unit cells, electrical insulation between the unit cells is achieved, and the impact force is prevented from propagating between the unit cells. can do.

In the battery pack according to the present invention, the following variation configurations may be employed.
In the battery pack according to the present invention, in the above configuration, the partition further includes a third partition part that is formed in a partition shape in a direction intersecting the first partition part and the second partition part. A configuration in which the first partition wall portion, the second partition wall portion, and the third partition wall portion are integrally formed and continuous can be employed.

When such a configuration is adopted, even when at least one of the first partition wall portion and the second partition wall portion receives a force from an adjacent unit cell, the mechanical strength is maintained by the third partition wall portion and deformation is caused. It is difficult to cause such troubles.
In the battery pack according to the present invention, in the above configuration, when the first partition wall portion, the second partition wall portion, and the third partition wall portion are viewed in a cross section in a direction orthogonal to each extending direction, It is possible to employ a configuration in which at least a part of the cross-sectional area is smaller than the cross-sectional areas of the first partition wall and the second partition wall.

Thus, by making the cross-sectional area in the cross section of the third partition wall portion smaller than that of the first partition wall portion and the second partition wall portion, the mechanical strength can be relatively lowered, and the first partition wall portion and The drag from the second partition wall to the first unit cell and the second unit cell can be reduced. Therefore, it is desirable from the viewpoint of reducing the impact force.
In the battery pack according to the present invention, in the above configuration, when the third partition wall portion is viewed from a direction orthogonal to the main surface, a configuration in which a part of the third partition wall portion is notched is adopted. can do.

This makes it possible to easily reduce the cross-sectional area of the third partition wall portion relative to the first partition wall portion and the second partition wall portion, which is desirable from the viewpoint of reducing the impact force.
In the battery pack according to the present invention, in the configuration described above, the fourth partition wall is fin-shaped in the direction intersecting the main surface from the main surface of the first cell in the first partition wall on the first cell end face side. A plurality of protrusions are formed so that the tip of the fourth partition wall is in contact with or close to the end surface of the first unit cell of the first unit cell.

  In the case of adopting such a configuration, a manufacturing error of the first unit cell or the like can be absorbed at the contact location or a proximity location, and the manufacturing yield can be improved. Moreover, a clearance gap can be comprised between a 1st partition part and the 1st end surface of a 1st unit cell, for example, the path | route of the gas discharged | emitted from the safety valve can be ensured, and high safety | security can be ensured. It is desirable from the viewpoint of.

  In the battery pack according to the present invention, in the above configuration, when the first unit cell end surface of the first unit cell and the first partition wall portion are viewed from a direction orthogonal to the first unit cell end surface of the first unit cell. A part of the end face of the first unit cell of the first unit cell is not covered with the first partition wall portion, and the direction of the second unit cell is perpendicular to the end face of the second unit cell of the second unit cell. When looking at the end face of the second unit cell and the second partition wall, it is possible to adopt a configuration in which a part of the end surface of the second unit cell of the second unit cell is not covered with the second partition wall part. .

In the case of adopting such a configuration, the part of the first unit cell end face of the first unit cell and the part of the second unit cell end face of the second unit cell include the first partition wall and the second part. It faces the space without facing the partition. Therefore, it is more desirable from the viewpoint of preventing the propagation of impact force.
In the battery pack according to the present invention, in the above configuration, the exterior body includes a shallow case-shaped first case member and a second case member that seals the opening of the first case member. A configuration in which the first case member is erected from the inner surface of the bottom wall can be employed. That is, the rib as the partition wall can be erected from the inner surface of the bottom wall of the first case member. Thereby, the movement of the 1st unit cell and the 2nd unit cell inside an exterior body can be controlled more certainly.

  In the battery pack which concerns on this invention, the structure that the partition is integrally formed with the 1st case member in the said structure is employable. Thus, by forming the partition wall integrally with the first case member, it is possible to reduce the number of parts and to reduce the manufacturing cost.

It is a schematic perspective view which shows the external appearance structure of the battery pack 1 which concerns on embodiment of this invention. 3 is a schematic plan view showing a state where a case member 11 of the battery pack 1 is removed. FIG. 3 is a schematic plan view showing an internal configuration of a case member 12. FIG. (A) is a model perspective view which shows the partial structure of the rib 121 standingly arranged from the inner surface of the bottom wall 12a of the case member 12, (b) is further the partial structure by the arrow in (a). It is a schematic side view shown from the direction of B. FIG. 3 is a schematic perspective view showing a state in which a battery pack 1 is attached to a mobile TV receiver 700. (A) is a schematic plan view which shows the relationship of the rib 121 with respect to unit cell 153,154, (b) is the model side view. (A) And (b) is a schematic diagram which shows the fall direction in a drop test. (A) is a schematic plan view which shows the structure of the rib 221 which concerns on the modification 1, (b) is a schematic plan view which shows the structure of the rib 321 which concerns on the modification 2. FIG. (A) is a schematic plan view which shows the structure of the rib 421 which concerns on the modification 3, (b) is a schematic plan view which shows the structure of the rib 521 which concerns on the modification 4. FIG. FIG. 10 is a schematic side view showing the configuration of a rib 621 according to Modification Example 5. (A) is a schematic plan view which shows the relationship between the adjacent unit cells 953 and 954 and the rib 921 in the battery pack based on a prior art, (b) is the model side view.

Below, the form for implementing this invention is demonstrated using drawing. In addition, the specific example shown below is an example used for easily explaining the configuration of the present invention and the operations and effects produced from the configuration, and the present invention is not limited to the components essential to the invention. The following specific examples are not limited at all.
[Embodiment]
1. External Configuration of Battery Pack 1 The external configuration of the battery pack 1 according to the present embodiment will be described with reference to FIG.

As shown in FIG. 1, the battery pack 1 according to the present embodiment includes an outer case 10 having a flat rectangular outer shape, a connection lead 13 extending in the Y-axis direction from a part of the side wall, and a connection The external appearance is constituted by the connector 14 connected to the tip portion of the lead 13.
The exterior case 10 is configured by arranging case members 11 and 12 each having a shallow dish shape so that their openings face each other and are joined to each other. The exterior case 10 is configured such that the height in the Z-axis direction is lower than the lengths in the X-axis direction and the Y-axis direction.

2. Internal Configuration of Battery Pack 1 The internal configuration of the battery pack 1 will be described with reference to FIG. FIG. 2 is a schematic plan view showing a state in which the case member 11 is removed from the state shown in FIG.
As shown in FIG. 2, a core pack 15 including eight unit cells 151 to 158 in the configuration is housed inside the case member 12. The core pack 15 includes a circuit board, connection leads, and the like not shown in the drawing.

  Each of the eight unit cells 151 to 158 has a flat rectangular external shape. In the case member 12, the unit cells 151, 153, 155, and 157 are arranged in parallel in the Y-axis direction, and the side surfaces are in contact with or close to each other. Similarly, in the case member 12, the unit cells 152, 154, 156, and 158 are also arranged in parallel in the Y-axis direction, and their side surfaces are in contact with or close to each other.

Here, the unit cells 151 to 158 are arranged so that the lower part in the X-axis direction becomes a sealing plate and the upper part in the X-axis direction becomes the bottom of the outer can. That is, the unit cells 151 to 158 are arranged so that the outer surface of the sealing plate that is the first end surface faces downward in the X-axis direction and the bottom surface of the outer can that is the second end surface faces upward in the X-axis direction.
As shown in FIG. 2, the unit cell 151 and the unit cell 152 are arranged with a gap between the outer surface of the sealing plate and the bottom surface of the outer can, and the unit cell 153, the unit cell 154, and the unit cell 155. The unit cell 156 and the unit cell 157 and the unit cell 158 are arranged with the same relationship.

As shown in FIG. 2, ribs 121 as partition walls are interposed between the unit cells 151, 153, 155, 157 and the unit cells 152, 154, 156, 158.
3. Configuration of Case Member 12 The configuration of the case member 12 will be described with reference to FIGS.
As shown in FIG. 3, the case member 12 forms a shallow dish shape by a substantially rectangular bottom wall 12 a and a peripheral wall 12 b that rises from the outer side toward the front of the page.

Further, a partition-like rib 121 extending in the Y-axis direction is erected on the inner surface of the bottom wall 12a in the central region in the X-axis direction. The rib 121 is not provided linearly in the Y-axis direction, but is provided with a zigzag planar shape combining a plurality of U-shaped portions.
FIG. 4A shows an extracted part indicated by an arrow A in FIG. 3, and FIG. 4B is a schematic side view showing a part thereof from the direction of arrow B in FIG.

  As shown in FIG. 4A, the rib 121 includes first rib portions 121a and 121c and a second rib portion 121b that both extend in the Y-axis direction, and a third rib portion 121d that extends in the X-axis direction. It is formed integrally. The first rib portions 121a and 121c, the second rib portion 121b, and the third rib portion 121d are all erected upward from the inner surface of the bottom wall 12a of the case member 12 in the Z-axis direction. It is integrally formed as a part.

The case member 12 including the ribs 121 is formed using an insulating material (for example, polycarbonate resin, ABS resin, polystyrene resin, etc.). The rib 121 is provided as a partition for electrically insulating the unit cells 151, 153, 155, 157 and the unit cells 152, 154, 156, 158.
The first rib portions 121a and 121c and the second rib portion 121b are arranged in a state shifted in the X-axis direction.

The third rib portion 121d is joined to the first rib portions 121a and 121c at one end in the X-axis direction and is connected to the second rib portion 121b at the other end. And as shown in FIG.4 (b), the Z-axis direction upper part of the 2nd rib part 121d is notched (notch part 121e).
4). An example of the usage pattern and the effects to be achieved An example of the usage pattern of the battery pack 1 according to the present embodiment will be described with reference to FIG.

First, as shown in FIG. 5, the battery pack 1 according to the present embodiment is used as a power source of the mobile TV receiver 700 and is mounted therein. The mobile TV receiver 700 is used while standing by the stand 701 along the X-axis direction that is slightly inclined with respect to the X-axis direction.
In this state, the battery pack 1 is in a state in which the end surfaces of the built-in unit cells 151 to 158 (see FIG. 2) are arranged along the X-axis direction. For this reason, when a user moves the mobile TV receiver 700, it is possible that an impact force is applied to the unit cells 151 to 158 included in the battery pack 1 in the X-axis direction.

That is, as shown in FIG. 6A, it is conceivable that the forces of the arrows C ₁ and C ₂ are applied to the unit cells 153 and 154 as the mobile TV receiver 700 moves. At this time, in the battery pack 1 according to the present embodiment, the first rib portion 121a and the second rib portion 121b of the rib 121 are arranged in a state of being separated from each other in the X-axis direction. There is a space between the lower end surface (outer surface of the sealing plate) 153a in the X-axis direction and the upper end surface (outer surface of the bottom wall of the outer can) 154b of the unit cell 154 in the X-axis direction. Therefore, this space becomes a buffer region against propagation of impact force, failure of the unit cells 151 to 158 in the battery pack 1, disconnection of circuit boards and leads (not shown) included in the core pack 15, etc. It is hard to produce.

  In addition, a third rib portion 121f (the same configuration as the third rib portion 121d) is integrally formed with the first rib portion 121a and the second rib portion 121b at a portion indicated by an arrow D in FIG. ing. As shown in FIG. 6 (b), the third rib 121f also has a notch in the Z-axis direction upper side (notch 121g), whereby the mechanical strength of the first rib 121a and the first rib It is lower than the 2 rib part 121b. Therefore, the propagation of the impact force between the unit cells 153 and 154 is mitigated by slight bending of the first rib portion 121a and the second rib portion 121b by the notch portion 121g of the third rib portion 121f. Become.

  Further, as shown in FIG. 6B, a plurality of fin-shaped fourth rib portions 121h are projected from the main surface of the first rib portion 121a on the unit cell 153 side, and an end surface 153a of the unit cell 153 is provided. Is in contact with the tip side of the fourth rib portion 121h. For this reason, most of the end surface 153a of the unit cell 153 faces the space and contributes to relaxation of the impact force. As shown in FIG. 6 (a), the end surface 154 of the unit cell 154 is not entirely in contact with the main surface of the second rib portion 121b but partly faces the space. This also contributes to relaxation of the impact force.

  In the present embodiment, the rib 121 is formed integrally with the case member 12. For this reason, the number of parts can be reduced and the manufacturing cost can be reduced. However, the rib 121 is not necessarily integrated with the case member 12 and may be a separate part. In consideration of the cost of the mold used for manufacturing the case member 12, it is possible to decide whether to form the case member 12 integrally or separate parts.

5. Effect confirmation test In order to confirm the said effect, the Example sample and the comparative example sample were prepared, and the drop test was done about each.
(1) Example Sample An example sample is a battery pack that employs the configuration according to the above embodiment.

(2) Comparative Example Sample In the comparative example sample, the shape of the rib inserted between the unit cells was a straight shape as shown in FIG. About the other structure, it was set as the same as an Example sample.
(3) Test method Three each of the example sample and the comparative example sample were prepared, and a drop test was performed. In the drop test, as shown in FIGS. 7A and 7B, the direction of 1 to 10 was sequentially dropped downward, and this was regarded as one cycle.

The fall surface is a hardwood and the fall height is 100 cm.
Regarding the evaluation of the drop test, the appearance inspection and the measurement of OCV (open circuit voltage) and IR (internal resistance) were performed at the end of each cycle, and when there was no abnormality, the test was continued up to 5 cycles. Regarding battery performance, an OCV difference was within ± 0.1 V and an IR difference was within ± 5% was regarded as normal. In addition, regarding the appearance inspection, a state in which the case was not damaged (cracked) was regarded as having no abnormality. The results are shown below.

As shown in Table 1, in Examples 1 to 3, no abnormality was observed in OCV, IR, and appearance confirmation even after 5 cycles were completed.
On the other hand, as shown in Table 2, in the sample of Comparative Example 1, rib breakage occurred in the middle of the third cycle. Similarly, in the sample of Comparative Example 3, rib breakage occurred in the middle of the third cycle. . Further, in the sample of Comparative Example 2, an IR abnormality caused by spot detachment occurred.

From the above results, by adopting the rib structure as in the present embodiment, it is possible to determine that the transmission of impact force between the unit cells is suppressed, and that there is an effect in the drop resistance performance.
[Modification 1]
The configuration of the battery pack according to Modification 1 will be described with reference to FIG. FIG. 8A illustrates only a partial configuration of the rib 221 that is different from the battery pack 1 according to the above embodiment. Since other configurations are the same as those in the above embodiment, illustration and description thereof are omitted.

  As indicated by the arrow E in FIG. 8A, in the rib 221 according to this modification, the third rib portion 221f formed so as to connect the first rib portion 221a and the second rib portion 221b has an X axis. It extends in an oblique direction inclined with respect to the X axis, not in the form along the axis. Thereby, the opposing area | region of the 1st rib part 221a with respect to the end surface of the unit cell 153 and the opposing area | region of the 2nd rib part 221b with respect to the end surface of the unit cell 154 can be taken widely, and it is excellent from a viewpoint of holding | maintenance of a unit cell. And also in this modification, the impact force can be mitigated by opening a space between the unit cell 153 and the unit cell 154, and the propagation of the impact force between the unit cells can be suppressed. .

Also in this modification, the third rib portion 221f is provided with a notch 221g.
[Modification 2]
A configuration of the battery pack according to Modification 2 will be described with reference to FIG. FIG. 8B also shows only a partial configuration of the rib 321 that is different from the battery pack 1 according to the above embodiment. Since other configurations are the same as those in the above embodiment, illustration and description thereof are omitted.

As indicated by an arrow F in FIG. 8B, in the rib 321 according to this modification, two third rib portions 321f and 321i are formed so as to connect the first rib portion 321a and the second rib portion 321b. Is provided. Similarly to the above, the third rib portions 321f and 321i are also provided with notches 321g and 321j.
In the configuration of the rib 321 according to this modification, the first rib portion 321a and the second rib portion 321b are connected by connecting the first rib portion 321a and the second rib portion 321b with two third rib portions 321f and 321i. Even when the thickness is reduced, their mechanical rigidity can be maintained to some extent. And also in this modification, the impact force can be mitigated by opening a space between the unit cell 153 and the unit cell 154, and the propagation of the impact force between the unit cells can be suppressed. .

[Modification 3]
The configuration of the battery pack according to Modification 3 will be described with reference to FIG. FIG. 9A also shows only a partial configuration of the rib 421 that is different from the battery pack 1 according to the above embodiment. Since other configurations are the same as those in the above embodiment, illustration and description thereof are omitted.

  In the said embodiment and the modifications 1 and 2, although it was set as the structure by which the 3rd rib part 121d, 121f, 221f, 321f was extended and formed linearly in planar view, as shown to Fig.9 (a), In this modification, the third rib portion 421f is curved in an S shape. The third rib part 421f connects the first rib part 421a on the unit cell 153 side and the second rib part 421b on the unit cell 154 side. Therefore, also in this modified example, similarly to the above, by making a space between the unit cells 153 and 154, the impact force can be mitigated, and the propagation of the impact force between the unit cells is suppressed. be able to.

In addition, also in the rib 421 according to this modification, the upper portion of the third rib portion 421f is cut out (outlined portion).
[Modification 4]
The configuration of the battery pack according to Modification 4 will be described with reference to FIG. FIG. 9B also shows only a partial configuration of the rib 521 that is different from the battery pack 1 according to the above embodiment. Since other configurations are the same as those in the above embodiment, illustration and description thereof are omitted.

As shown in FIG. 9B, the rib 521 according to the present modification has a plane shape that is substantially the same as the rib 121 of the above embodiment. However, in the rib 521 according to this modification, the upper portion of the third rib portion 521f is not cut out, and the thickness of the third rib portion 521f with respect to the thickness t _{1 of} the first rib portion 521a and the second rib portion 521b. It is characterized in that the thickness t ₂ is reduced.
In the rib 521 of the present modified example having such a feature, the mechanical strength of the third rib portion 521f is suppressed to be lower than that of the first rib portion 521a and the second rib portion 521b, and the impact force is further reduced. Is possible.

Therefore, also in this modified example, as described above, it is possible to reduce the impact force by opening a space between the unit cells, and to suppress the propagation of the impact force between the unit cells. it can.
[Modification 5]
The configuration of the battery pack according to Modification 5 will be described with reference to FIG. FIG. 10 also illustrates a part of the configuration of the rib 621 that is different from the battery pack 1 according to the above embodiment. Since other configurations are the same as those in the above embodiment, illustration and description thereof are omitted.

  As shown in FIG. 10, also in this modification, the rib 621 is erected upward from the inner surface of the bottom wall of the case member 62 in the Z-axis direction. The ribs 621 are arranged in the X-axis direction so as to connect the first rib portion 621a along the end surface of the unit cell 153 and the second rib portion 621b along the end surface of the unit cell 154, as in the above-described embodiment. The extending third rib portion 621f and the fin-shaped fourth rib portion 621h protruding from the main surface of the first rib portion 621a on the unit cell 153 side are integrally formed with the case member 62.

  In the rib 621 according to this modification, an opening 621g is provided in the lower portion of the third rib portion 621f in the Z-axis direction. As described above, in the rib 621 according to the present modification, the opening 621g in the lower portion in the Z-axis direction is provided instead of the notch in the upper portion in the Z-axis direction, so that the first rib portion 621a and the second rib portion 621b are provided. The cross-sectional area of the transverse section of the third rib portion 621f is reduced, thereby reducing the mechanical strength and further reducing the impact force.

Therefore, also in this modified example, as described above, it is possible to reduce the impact force by opening a space between the unit cells, and to suppress the propagation of the impact force between the unit cells. it can.
[Other matters]
In the said embodiment and the modifications 1-5, although it did not mention in particular about the kind of unit cell, various types of unit cells can be employ | adopted. For example, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery, an alkaline secondary battery such as a nickel cadmium secondary battery and a nickel hydrogen secondary battery, or the like can be employed.

Further, the external shape of the unit cell is not limited to the flat rectangular shape, and it is sufficient that the external shape is configured by the two end faces and the peripheral surface that are opposed to each other. For example, a cylindrical battery is adopted. You can also.
In the above embodiment, the outer case 10 is composed of the case member 11 and the case member 12 each having a shallow dish shape. However, the configuration of the outer case is not limited thereto. . For example, it is possible to adopt a configuration in which a single shallow plate or flat plate case member is used and a core pack is placed on the case member, and the periphery is surrounded by an exterior label. A shallow dish shape may be used, and the other case member may be a flat plate shape.

In addition, when the partition wall interposed between the unit cells is not the rib 121 standing from the inner surface of the bottom wall of the case member 12 but separate from the outer case, the outer case has a side of the core pack. It is also possible to adopt a configuration in which the surrounding frame is used and the exposed portion of the core pack is covered with an exterior label.
Moreover, in the said embodiment and the modifications 1-5, although the constituent material of the rib was the same resin material as a case member, the constituent material of a partition should just be a material which has electrical insulation. For example, ceramics or a metal plate whose surface is insulated can be used.

Moreover, in the said embodiment, although it was set as the structure by which the eight unit cells 151-158 were accommodated in the inside of the exterior case 10, if the number of unit cells accommodated is two or more, there will be no limitation.
In addition, the configuration of the partition wall described above is not necessarily applied to all the portions where the end faces face each other, and is important for suppressing the transmission of the impact force, where the impact force is easily applied experimentally or experimentally. It is also possible to apply the above-described configuration to a limited part. And about the remaining part, it can also be made to be in the state (state like FIG. 11 (a), (b)) which the end surfaces of the unit cell pinched | interposed only the board thickness (FIG. 11). (States as in (a) and (b)). Thereby, high impact resistance can also be obtained while realizing high space efficiency.

  In the above embodiment, the mobile TV receiver 700 is given as an example of usage of the battery pack 1, but other than this, for example, mobile devices such as mobile phones and tablet personal computers, It can also be used for applications such as electric vehicles (PEV), hybrid electric vehicles (HEV), electric motorcycles, electric assist bicycles, and other vehicles.

  Furthermore, in the said embodiment and the modifications 1-5, 1st rib part 121a, 121c, 221a, 321a, 421a, 521a, 621a and 2nd rib part 121b, 221b, 321b, 421b, 521b, 621b, The configuration of the ribs 121, 221, 321, 421, 521, 621 connected by the third rib portions 121 d, 121 f, 221 f, 321 f, 321 i, 421 f, 521 f, 621 f is adopted, but the third rib portion is omitted. A form can also be adopted. Specifically, the first rib portion and the second rib portion may be separated from each other in a direction orthogonal to the extending direction, and there may be no third rib portion connecting between the first rib portion and the second rib portion. Even when such a configuration is adopted, a space can be provided between the end face of one unit cell and the end face of another unit cell, and propagation of impact force can be suppressed.

  In the above embodiment, the tip side of the fin-shaped fourth rib portion 121h is in contact with the end surface 153a of the unit cell 153, but the fourth rib portion is not an essential configuration. . That is, the main surface of the first rib portion may be in direct contact with the end surface of the unit cell. In addition, about the end surface of a partition and a unit cell, it can also be set as the proximity | contact state in which a clearance gap exists in the level which does not become a problem with respect to the vibration from the outside. For example, depending on the intended use, even if there is a gap with an upper limit of about 0.3 mm to 0.5 mm between the end face of the unit cell and the rib, it may be allowed.

In addition, as shown in FIG. 2, there is a case where it is not always necessary to insert a partition wall between the cells adjacent in the Y-axis direction. It is good also as inserting a partition between them. Even in that case, the above-described rib configuration can be adopted.
Further, as shown in FIG. 6, in the above embodiment, the unit cell 153 and the unit cell 154 are opposed to the outer surface 153 a of the sealing plate in the unit cell 153 and the bottom wall outer surface 154 b of the outer can in the unit cell 154. However, the present invention is not limited to this. For example, in the case of an arrangement configuration in which the outer surface of the sealing plate of the unit cell 153 and the outer surface of the sealing plate of the unit cell 154 face each other, the same effect can be obtained by interposing the partition wall having the above configuration between the outer surfaces of the sealing plate. Can do. Also, an arrangement configuration in which the outer wall of the outer can of the unit cell 153 and the outer surface of the sealing plate of the unit cell 154 face each other, the outer surface of the outer wall of the outer can in the unit cell 153, Even in the case of adopting an arrangement form that is opposed to each other, the same effect can be obtained by inserting the partition wall having the above-described configuration between the end faces.

  The present invention is useful for realizing a battery pack that can be used as a power source for mobile devices and vehicles by having high impact resistance.

1. Battery pack 10. Exterior case 11,12. Case member 13. Connection lead 14. Connector 15. Core pack 121,221,321,421,521,621. Ribs 121a, 121c, 221a, 321a, 421a, 521a, 621a. 1st rib part 121b, 221b, 321b, 421b, 521b, 621b. 2nd rib part 121d, 121f, 221f, 321f, 321i, 421f, 521f, 621f. 3rd rib part 121e, 121g, 221g, 321g, 321j. Notches 121h, 621h. 4th rib part 151-158. Unit cell 621 g. Opening 700. Mobile TV receiver 701. stand

Claims (8)

A battery pack comprising an exterior body, and a first unit cell and a second unit cell housed in the exterior body,
The first unit cell has an outer shape composed of a first end surface and a second end surface facing each other, and a side peripheral surface surrounding the side periphery,
The second unit cell has an outer shape constituted by a third end surface and a fourth end surface facing each other, and a side peripheral surface surrounding the side periphery,
In a state where one end surface of the first end surface or the second end surface of the first unit cell and one end surface of the third end surface or the fourth end surface of the second unit cell are spaced from each other. It is arranged to face each other,
A partition made of an insulating material is interposed between the one end surface of the first unit cell and the one end surface of the second unit cell,
The partition walls are separated from each other in a direction perpendicular to the one end surface of the first unit cell, and both are in a direction along the one end surface of the first unit cell and the one end surface of the second unit cell. It has a first partition wall portion and a second partition wall portion that are stretched and formed in a partition shape,
The first partition wall portion is disposed closer to the one end face of the first unit cell than the second partition wall portion,
The battery pack, wherein the second partition wall portion is disposed closer to the one end surface of the second unit cell than the first partition wall portion. The partition wall further includes a third partition wall portion that is formed in a partitioning manner in a direction intersecting the first partition wall portion and the second partition wall portion.
The battery pack according to claim 1, wherein the first partition wall portion, the second partition wall portion, and the third partition wall portion are integrally formed and continuous. When the first partition wall portion, the second partition wall portion, and the third partition wall portion are viewed in a cross section in a direction orthogonal to the respective stretching directions,
3. The battery pack according to claim 2, wherein a cross-sectional area of at least a part of the third partition wall portion is smaller than cross-sectional areas of the first partition wall portion and the second partition wall portion. When viewing the third partition wall portion from a direction orthogonal to the main surface,
The battery pack according to claim 3, wherein a part of the third partition wall is cut away. A plurality of fin-shaped fourth partition wall portions projectingly formed in a direction intersecting the main surface from the main surface on the one end face side of the first unit cell in the first partition wall portion,
The battery pack according to any one of claims 1 to 4, wherein a tip portion of the fourth partition wall is in contact with or close to the one end surface of the first unit cell. When viewing the one end surface of the first unit cell and the first partition wall from a direction orthogonal to the one end surface of the first unit cell, one of the one end surfaces of the first unit cell The part is not covered with the first partition part,
When viewing the one end surface of the second unit cell and the second partition wall portion from a direction orthogonal to the one end surface of the second unit cell, one of the one end surfaces of the second unit cell The battery pack according to any one of claims 1 to 5, wherein the portion is not covered with the second partition wall. The exterior body includes a first case member having a shallow dish shape and a second case member that seals the opening of the first case member.
The battery pack according to any one of claims 1 to 6, wherein the partition wall is erected from an inner surface of a bottom wall of the first case member. The battery pack according to claim 7, wherein the partition wall is integrally formed with the first case member.

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