JP2009277433A - Battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery pack in which a plurality of box-shape battery cells are precisely contained with a simple structure and which has a high resistance to vibration and shock. <P>SOLUTION: The battery pack 2 has a lattice-like partition portion thereinside and houses each of one or more box-shape battery cells in a space demarcate by the lattice-like partition portion. A pressing groove 4 is provided at part of the portion of the inner face portion of the battery pack 2, which contacts the side of each of the battery cells when the respective battery cells are housed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a battery pack that houses one or more box-shaped battery cells.

  Conventionally, batteries incorporating cells such as secondary batteries have been used in various situations. For example, a portable electronic device such as a notebook personal computer can be used even when a commercial power source is not present at a short distance by using a built-in battery as a power source, and is excellent in portability and portability. In addition, an electric vehicle that does not require an internal combustion engine such as a gasoline engine or a diesel engine and drives a motor with electric power from a battery is attracting attention as an automobile with a low environmental load. In recent years, hybrid cars that use an engine and an electric motor together and adjust the output distribution according to the rotation range to optimize energy consumption have become widespread. Since the battery used in such a hybrid car is charged by using the electric power generated by the regenerative brake or the engine, there is an advantage that the user does not need to charge it consciously.

  In addition, a battery-assisted bicycle that supplements the pedaling force of an occupant with auxiliary power from an electric motor uses a battery pack as a power source for supplying electric power to the electric motor. The battery pack includes a plurality of cells. The battery pack is detached from the vehicle body at the time of charging and is connected to a charging connector to charge the battery. The battery pack is attached to the vehicle body during traveling to supply power to the electric motor.

  Since the battery pack is required to have stable strength and insulation properties in a state where a plurality of cells are incorporated, the structure is devised. Patent Document 1 describes a battery pack that is easy to assemble and highly reliable. This battery pack is a battery pack that houses a plurality of rectangular battery cells in a case, and is a box-shaped partition member that supports a plurality of rectangular battery cells in a state of being stacked with gaps between the battery cells. Have The partition member is provided according to the thickness of the battery cell, and includes a convex portion that supports the battery cell at the peripheral edge portion, and a protrusion that is provided on the convex portion and sandwiches the battery cell. Further, the partition member is provided with an opening from which the side wall is almost removed on the contact surface with the side surface of the battery cell, and at least an insulating member that insulates between battery cells connected in parallel is provided. .

  Therefore, according to the battery pack described in Patent Document 1, a plurality of prismatic battery cells are supported by a partition member alone in a state where gaps are provided between the battery cells and stacked, thereby insulating the battery cells. It can be supported with high accuracy, strength and stability. In addition, it is easy to assemble, and the insulating member that insulates at least the battery cells that are electrically connected in parallel is provided on the partition member, so that the battery cells having different potentials can be more reliably insulated. Can do.

In addition, according to the battery pack, by providing the partition member with a positioning mechanism such as a battery cell, a tab, or a circuit board, the assembly is further facilitated, the positional accuracy of the battery cell can be improved, and the strength is increased. be able to.
JP-A-2005-203207

  However, many conventional battery packs are weakly resistant to vibration and shock. Even when a partition member is provided and supported between cells as in the battery pack described in Patent Document 1, each battery cell stored in the battery pack has a slight gap between the partition member and the like. And may not be completely fixed. Such a structure of the battery pack does not cause a problem depending on the usage of the battery pack. However, when the battery pack is used for an application such as an electric bicycle in which continuous vibration and impact are expected, There is a possibility of damage. Also, in order to connect a plurality of battery cells housed in series or in parallel, the electrodes of each battery cell are often connected via wiring welded in the battery pack, As a result of the battery cells moving apart due to vibration for a long time, it may be considered that the wiring due to welding is disconnected.

  Moreover, when box-shaped battery cells are welded with a lid portion in the manufacturing process, a band-like swell called a weld bead is often formed in the welded portion. Accordingly, the weld bead formed on the peripheral edge of the surface of the lid of the box-type battery cell hits the inner wall of the battery pack when the battery cell is inserted into the battery pack, and a gap is formed between the battery cell and the inner wall of the battery pack. For this reason, the inserted battery cell may be fixed in an unstable manner, resulting in deterioration of vibration resistance.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems of the prior art, and an object thereof is to provide a battery pack having a simple configuration and accurately storing a plurality of box-shaped battery cells and having high resistance to vibration and impact. .

  In order to solve the above-described problem, a battery pack according to the present invention has a grid-like partition portion inside, and one or more box-shaped battery cells are included in a space defined by the grid-like partition portion. A battery pack for storing each of the battery packs, wherein a first groove portion is formed in a part of an inner surface portion of the battery pack that contacts a side of each of the battery cells when the battery cells are stored. It is provided.

  According to the present invention, a plurality of box-shaped battery cells can be accurately stored with a simple configuration, and a battery pack having high resistance to vibration and impact can be realized.

  Hereinafter, embodiments of a battery pack according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view illustrating an appearance of a battery pack 2 according to a first embodiment of the present invention. First, the configuration of the present embodiment will be described. This battery pack 2 has a grid-like partition part inside, and stores each of one or more box-shaped battery cells 1 in a space partitioned by the grid-like partition part. In this embodiment, the battery pack 2 can accommodate six box-shaped battery cells 1 as shown in FIG. 1, and the electrodes of each battery cell are connected in series (or in parallel). Wiring is provided so that power can be taken out.

  FIG. 2 is a perspective view showing the external appearance of the battery packs 2 and 3 closed by accommodating six box-shaped battery cells 1. Similarly to the battery pack 2, the battery pack 3 has a grid-like partition, and is attached so as to cover the six box-shaped battery cells 1 inserted into the battery pack 2. Each of the six battery cells 1 sandwiched between the pack 2 is supported and fixed.

  In the battery packs 2 and 3 shown in FIG. 2, the number of battery cells 1 that can be stored as a single unit is six. However, by preparing and connecting multiple identical battery packs, a larger number of battery cells can be stored. It is also possible to output high voltage power. Further, the number of battery cells that can be stored in one battery pack is not limited to six and may be any number.

  FIG. 3 is a front view of the battery pack 2 of the present embodiment, and is a view when all the battery cells 1 are removed from the battery pack 2 in FIG. FIG. 4 is a diagram showing a cross section when viewed from above by cutting along the line AA ′ shown in FIG. 3. Further, FIG. 5 is a view showing a cross section when viewed from the side by cutting along line BB ′ shown in FIG. 3.

  As shown in FIGS. 3, 4, and 5, when each battery cell 1 is stored, the innermost surface of the battery pack 2 that is pressed by each battery cell 1 (the electrode of the battery cell 1 is provided). A surface facing the surface) is provided with an electrode hole 10a for exposing the electrode of the battery cell 1 to the outside. Two electrode holes 10a are provided in each space partitioned by a grid-like partition portion in order to provide positive and negative electrode terminals. Although not shown, the actual battery pack 2 is a wiring for connecting the electrodes exposed from the electrode holes 10a in order to integrally extract power from the plurality of battery cells 1 housed therein. Is provided by welding or the like, and a cover is provided for protecting the electrodes and wirings without exposing them.

  In the battery pack 2 of the present invention, the first groove portion is provided in a part of the inner surface portion of the battery pack 2 that contacts the side of each battery cell 1 when each battery cell 1 is stored. ing.

  In the present embodiment, the pressing surface groove 4 corresponds to the first groove portion of the present invention, and the innermost portion of the battery pack 2 pressed by each battery cell 1 when each battery cell 1 is stored. It is provided at the peripheral edge of the inner surface (the surface facing the surface provided with the electrode of the battery cell 1). Therefore, it can be said that the pressing surface groove 4 is provided in a portion that contacts the side of the surface provided with the electrode of each battery cell 1.

  In addition, the battery cell 1 in the present embodiment is welded with the surface provided with the electrode as a lid in the manufacturing process, and a weld bead on the welded portion (the portion corresponding to the side of the surface provided with the electrode of the battery cell 1). Is formed. Therefore, the pressing surface groove 4 is provided at a position where the weld bead enters the pressing surface groove 4 when the battery cell 1 is inserted into the battery pack 2.

  In addition, the groove shape of the pressing surface groove | channel 4 may be what kind of thing, A substantially concave shape, U shape, V shape etc. can be considered. An adhesive is injected into the pressing surface groove 4. Any adhesive may be injected into the pressing surface groove 4, but if an instantaneous adhesive is used, it may be removed when an impact is applied. It is preferable to use an agent or the like. Moreover, since the shrinkage | contraction rate at the time of hardening is small, an epoxy-type adhesive agent cannot be easily formed in a clearance gap, and is an adhesive agent suitable for filling the press surface groove | channel 4. FIG.

  The pressing surface groove 4 may be provided with a flexible member instead of the adhesive. The flexible member is, for example, a rubber material, a sponge material, a gel material, or the like, and is provided so as to be inserted into the pressing surface groove 4. Therefore, the flexible member is provided so as to fill the pressing surface groove 4 and may be provided so as to protrude slightly from the pressing surface groove 4.

  A battery pack 3 (shown in FIG. 2) used for fixing the battery cell 1 after the six box-shaped battery cells 1 are stored in the battery pack 2 has a groove corresponding to the first groove portion on the inner surface. However, the pressing surface groove 4 may be provided in the same manner as the battery pack 2.

  Next, the operation of the present embodiment configured as described above will be described. The operator injects adhesive into the pressing surface groove 4 inside the battery pack 2 and inserts and stores the six box-shaped battery cells 1 into the battery pack 2, and then the six box-shaped battery cells. 1 is attached and fixed so that the battery pack 3 is put on the 1. The adhesive may be previously injected into the pressing surface groove 4.

  As described above, each of the battery cells 1 has a weld bead formed on the welded portion (the portion corresponding to the side of the surface provided with the electrode of the battery cell 1). This weld bead is accommodated in the pressing surface groove 4 when the operator inserts the box-shaped battery cell 1 into the battery pack 2. Therefore, each of the battery cells 1 is stored in the battery pack 2 with high accuracy, and so-called rattling can be suppressed.

  The adhesive injected into the pressing surface groove 4 is cured after the battery cell 1 is inserted into the battery pack 2 and adheres to the portion (surface and weld bead) that contacts the pressing surface groove 4 of the battery cell 1. Since it is fixed, it is possible to increase resistance to impact and vibration. In particular, the battery pack 2 using a gel adhesive or the like can further increase resistance to impact or the like.

  When a member having flexibility is provided in the pressing surface groove 4 instead of the adhesive, the weld bead of each battery cell 1 is accommodated in the pressing surface groove 4 so as to press the member having flexibility. Is done. Therefore, although the battery cell 1 is not adhered to the battery pack 2, the flexible member fixes the battery cell 1 (particularly the weld bead portion) and absorbs impact and vibration.

  Even if a flexible member is provided so as to protrude slightly from the pressing surface groove 4, each battery cell 1 is accurately stored in the battery pack 2 so as to press the member. Further, the flexible member pressed down by the battery cell 1 fills the gap, fixes the battery cell 1 and plays a role of protecting it from impact and vibration.

  As described above, according to the battery pack 2 according to the first embodiment of the present invention, a plurality of box-shaped battery cells 1 can be accurately stored with a simple configuration, and resistance to vibration and impact can be increased. .

  Even when welding is performed on the outer peripheral end of the box-shaped battery cell 1, the weld beads of each of the battery cells 1 are accommodated in the pressing surface groove 4. Therefore, each of the battery cells 1 is stored in the battery pack 2 with high accuracy, and so-called rattling can be suppressed.

  In addition, since the adhesive injected into the pressing surface groove 4 adheres and fixes the portion (surface and weld bead) that contacts the pressing surface groove 4 of the battery cell 1, the resistance to impact and vibration can be increased. it can.

  Here, if the adhesive is simply applied to the innermost surface of the innermost part in the battery pack 2 instead of the inside of the pressing surface groove 4, the adhesive protrudes and spreads when pressed by the battery cell 1. It is possible. However, since the battery pack 2 in the present invention is provided with the adhesive in the pressing surface groove 4, when each battery cell 1 is stored in the battery pack 2 and pressed by the battery cell 1, the battery pack 2 protrudes and spreads. Can be prevented.

  Moreover, the battery cell 1 can be equipped with the electrode terminal in the vicinity of the location where an adhesive agent is used by the spreading | diffusion prevention effect of the adhesive by the press surface groove | channel 4. FIG.

  Further, when a member having flexibility is provided in the pressing surface groove 4 instead of the adhesive, the member having flexibility fixes the battery cell 1 (particularly the weld bead portion), and impact and vibration. Can be suppressed and vibration to the battery cell 1 can be suppressed. Moreover, when using the member which has a softness | flexibility, since the battery cell 1 and the battery pack 2 are not adhere | attached, the decomposition | disassembly of the battery pack 2 and taking out of the battery cell 1 are easy.

  FIG. 6 is a front view of the battery pack 2 according to the second embodiment of the present invention. FIG. 7 is a diagram showing a cross section when viewed from above by cutting along line CC ′ shown in FIG. Furthermore, FIG. 8 is a figure which shows the cross section at the time of cut | disconnecting by the DD 'line shown in FIG. 6, and seeing from the side surface. Moreover, the battery pack 2 of the present embodiment is provided with an electrode hole 10b for taking out the electrode of the battery cell 1 to the outside, as in the first embodiment.

  The battery pack 2 of the present embodiment is different from the first embodiment in that a side surface groove 5 is provided instead of the pressing surface groove 4.

  The side surface groove 5 corresponds to the first groove portion of the present invention, and is one of the portions of the inner surface portion of the battery pack 2 that contacts the side of each battery cell 1 when each battery cell 1 is stored. Provided in the department. Therefore, in this respect, the side surface groove 5 is the same as the pressing surface groove 4.

  However, the side surface groove 5 is opposed to the innermost surface (the surface provided with the electrode of the battery cell 1) of the battery pack 2 pressed by each battery cell 1 like the pressing surface groove 4 of the first embodiment. It is not provided in the peripheral part of the surface), but is provided so as to continue to a plurality of surfaces (ceiling surface, bottom surface, and side surface) adjacent to the inner surface of the innermost part.

  Accordingly, the pressing surface groove 4 and the side surface groove 5 are both in contact with the sides of the surface provided with the electrode of the battery cell 1, but the pressing surface groove 4 is the innermost surface (the electrode of the battery cell 1). The side groove 5 is different in that it is provided on a surface adjacent to the innermost surface of the innermost part.

  Usually, the weld bead is formed so as to rise in the direction in which the battery cell 1 is inserted, and therefore hardly enters the side groove 5.

  The side surface groove 5 may be any shape similar to the groove shape of the pressing surface groove 4, and may be substantially concave, U-shaped, V-shaped, or the like. An adhesive is injected into the side groove 5. The adhesive injected into the side groove 5 may be the same as the adhesive injected into the pressing surface groove 4 described in the first embodiment.

  Moreover, the side surface groove | channel 5 may be provided with the member which has a softness | flexibility instead of an adhesive agent similarly to the press surface groove | channel 4 of Example 1. FIG. Further, the battery pack 3 illustrated in FIG. 2 may have a side groove 5 on the inner surface, like the battery pack 2.

  Other configurations are the same as those of the first embodiment, and redundant description is omitted.

  Next, the operation of the present embodiment configured as described above will be described. The operator injects adhesive into the side groove 5 inside the battery pack 2, inserts and stores the six box-shaped battery cells 1 in the battery pack 2, and then stores the six box-shaped battery cells 1. Is attached and fixed so that the battery pack 3 is covered. The adhesive may be injected into the side groove 5 in advance.

  As described above, the side groove 5 does not have a great effect on the weld bead, but the adhesive injected into the inside adheres and fixes the battery cell 1 in the same manner as the pressing surface groove 4 of Example 1. Resistance to shock and vibration can be increased.

  When the flexible member is provided in the side groove 5 instead of the adhesive, the battery cell 1 is not bonded to the battery pack 2, but the pressed flexible member is: The battery cell 1 is fixed by filling the gap and plays a role of protecting the battery cell 1 by absorbing shock and vibration.

  As described above, according to the battery pack 2 according to the embodiment 2 of the present invention, a plurality of box-shaped battery cells 1 can be accurately stored with a simple configuration, and resistance to vibration and impact can be increased. .

  In addition, since the adhesive injected into the side surface groove 5 adheres and fixes the portion that contacts the side surface groove 5 of the battery cell 1, resistance to impact and vibration can be increased.

  Furthermore, since the battery pack 2 in the present invention is provided with the adhesive in the side groove 5, when each battery cell 1 is accommodated in the battery pack 2 and pressed by the battery cell 1, it protrudes and spreads. Can be prevented.

  Moreover, the battery cell 1 can be equipped with the electrode terminal in the vicinity of the location where an adhesive agent is used by the spreading | diffusion prevention effect by the side surface groove | channel 5. FIG.

  Further, in the case where a flexible member is provided in the side groove 5 instead of the adhesive, the flexible member fixes the battery cell 1 and absorbs shocks and vibrations so that the battery cell 1 Can be suppressed. Moreover, when using the member which has a softness | flexibility, since the battery cell 1 and the battery pack 2 are not adhere | attached, the decomposition | disassembly of the battery pack 2 and taking out of the battery cell 1 are easy.

  FIG. 9 is a front view of the battery pack 2 according to the third embodiment of the present invention. FIG. 10 is a diagram showing a cross section when viewed from above by cutting along the line EE ′ shown in FIG. 9. Further, FIG. 11 is a view showing a cross section when viewed from the side surface taken along the line FF ′ shown in FIG. Moreover, the battery pack 2 of the present embodiment is provided with an electrode hole 10c for taking out the electrode of the battery cell 1 to the outside, as in the first embodiment.

  The battery pack 2 of the present embodiment is different from the first embodiment in that a side surface groove 5 is provided in addition to the pressing surface groove 4. That is, the structure of the battery pack 2 in the present embodiment is a combination of the structures of the battery packs of the first and second embodiments.

  Other configurations are the same as those of the first embodiment, and redundant description is omitted.

  Next, the operation of the present embodiment configured as described above will be described. The operator injects adhesive into the pressing surface groove 4 and the side surface groove 5 inside the battery pack 2, inserts and stores the six box-shaped battery cells 1 in the battery pack 2, and then stores the six boxes. The battery pack 3 is attached and fixed to the battery cell 1 of the type. The adhesive may be previously injected into the pressing surface groove 4 and the side surface groove 5.

  The weld beads formed in each of the battery cells 1 are accommodated in the pressing surface groove 4 when the operator inserts the box-shaped battery cell 1 into the battery pack 2. Therefore, each of the battery cells 1 is stored in the battery pack 2 with high accuracy, and so-called rattling can be suppressed.

  The adhesive injected into the inside of the pressing surface groove 4 and the side surface groove 5 is cured after the battery cell 1 is inserted into the battery pack 2 and is in contact with the pressing surface groove 4 and the side surface groove 5 of the battery cell 1 ( Since the surface and the weld bead) are bonded and fixed, resistance to impact and vibration can be increased.

  When the pressing surface groove 4 and the side surface groove 5 are provided with a flexible member instead of the adhesive, the weld bead of each battery cell 1 is pressed against the flexible member. 4 is accommodated. Therefore, although the battery cell 1 is not bonded to the battery pack 2, the flexible member fixes the battery cell 1 and absorbs impact and vibration.

  Further, it is possible to adopt a configuration in which an adhesive is injected into the pressing surface groove 4 and a flexible member is provided in the side surface groove 5. Of course, the reverse is also possible.

  As described above, according to the battery pack 2 according to the third embodiment of the present invention, the same effects as those of the first and second embodiments can be obtained.

  FIG. 12 is a front view of the battery pack 2 according to the fourth embodiment of the present invention. FIG. 13 is a view showing a cross section when viewed from above by cutting along line GG ′ shown in FIG. Moreover, the battery pack 2 of the present embodiment is provided with an electrode hole 10 d for taking out the electrode of the battery cell 1 to the outside, as in the first embodiment.

  The battery pack 2 of the present embodiment is different from the first embodiment in that an intermediate groove 6 is provided in addition to the pressing surface groove 4.

  The intermediate groove 6 corresponds to the second groove portion of the present invention and is provided on a part of the inner surface of the battery pack 2 pressed by each battery cell 1. Specifically, the intermediate groove 6 is the innermost surface of the battery pack 2 that is pressed by each battery cell 1 when each battery cell 1 is stored (the surface provided with the electrode of the battery cell 1). Is provided so as to cross from the upper part to the lower part.

  The intermediate groove 6 may be any shape similar to the groove shape of the pressing surface groove 4 and the side surface groove 5, and may be substantially concave, U-shaped, V-shaped or the like. An adhesive is injected into the intermediate groove 6. The adhesive injected into the intermediate groove 6 may be the same as the adhesive injected into the pressing surface groove 4 described in the first embodiment.

  Moreover, the intermediate groove 6 may be provided with a member having flexibility instead of the adhesive, similarly to the pressing surface groove 4 of the first embodiment. Further, the battery pack 3 illustrated in FIG. 2 may have an intermediate groove 6 on the inner surface in the same manner as the battery pack 2.

  Other configurations are the same as those of the first embodiment, and redundant description is omitted.

  Next, the operation of the present embodiment configured as described above will be described. The operator injects adhesive into the pressing surface groove 4 and the intermediate groove 6 inside the battery pack 2, inserts and stores the six box-shaped battery cells 1 in the battery pack 2, and then six boxes. The battery pack 3 is attached and fixed to the battery cell 1 of the type. The adhesive may be injected into the pressing surface groove 4 and the intermediate groove 6 in advance.

  The weld beads formed in each of the battery cells 1 are accommodated in the pressing surface groove 4 when the operator inserts the box-shaped battery cell 1 into the battery pack 2. Therefore, each of the battery cells 1 is stored in the battery pack 2 with high accuracy, and so-called rattling can be suppressed.

  The adhesive injected into the inside of the pressing surface groove 4 and the intermediate groove 6 is cured after the battery cell 1 is inserted into the battery pack 2, and is a portion that contacts the pressing surface groove 4 and the intermediate groove 6 of the battery cell 1 ( Since the surface and the weld bead) are bonded and fixed, resistance to impact and vibration can be increased.

  When a member having flexibility is provided in the pressing surface groove 4 and the intermediate groove 6 instead of the adhesive, the welding bead included in each battery cell 1 presses the member having flexibility. 4 is accommodated. In addition, since each battery cell 1 is not shaped to enter the intermediate groove 6, the flexible member provided in the intermediate groove 6 is preferably provided so as to slightly protrude from the intermediate groove 6. Thereby, the said member provided in the intermediate groove 6 is pressed when the battery cell 1 is accommodated, and while fixing the battery cell 1, it absorbs an impact and a vibration.

  Furthermore, it is possible to adopt a configuration in which an adhesive is injected into the pressing surface groove 4 and a flexible member is provided in the intermediate groove 6. Of course, the reverse is also possible.

  As described above, according to the battery pack 2 according to the fourth embodiment of the present invention, in addition to the effects of the first embodiment, the number of bonded portions is increased by injecting the adhesive into the intermediate groove 6 to improve the reliability. be able to.

  Moreover, the battery cell 1 can be equipped with the electrode terminal in the vicinity of the location where an adhesive agent is used by the spreading | diffusion prevention effect of the adhesive agent by the intermediate groove 6. FIG.

  Further, in the case where a flexible member is provided in the intermediate groove 6 instead of the adhesive, the flexible member fixes the battery cell 1 and absorbs shock and vibration, so that the battery cell 1 Can be suppressed.

  The battery pack according to the present invention can be used for a battery pack that is used for an application in which vibration or impact is assumed in advance, such as an electric bicycle.

It is a perspective view which shows the external appearance of the battery pack of the form of Example 1 of this invention. It is a perspective view which shows the external appearance of the battery pack after the battery cell accommodation of the form of Example 1 of this invention. It is a front view of the battery pack of the form of Example 1 of this invention. It is sectional drawing at the time of seeing the battery pack of the form of Example 1 of this invention from upper direction. It is sectional drawing at the time of seeing the battery pack of the form of Example 1 of this invention from the side surface. It is a front view of the battery pack of the form of Example 2 of this invention. It is sectional drawing at the time of seeing the battery pack of the form of Example 2 of this invention from upper direction. It is sectional drawing at the time of seeing the battery pack of the form of Example 2 of this invention from the side surface. It is a front view of the battery pack of the form of Example 3 of this invention. It is sectional drawing at the time of seeing the battery pack of the form of Example 3 of this invention from upper direction. It is sectional drawing at the time of seeing the battery pack of the form of Example 3 of this invention from the side surface. It is a front view of the battery pack of the form of Example 4 of this invention. It is sectional drawing at the time of seeing the battery pack of the form of Example 4 of this invention from upper direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Battery cell 2 Battery pack 3 Battery pack 4 Pressing surface groove | channel 5 Side surface groove | channel 6 Intermediate grooves 10a, 10b, 10c, 10d Electrode hole

Claims (5)

A battery pack having a grid-like partition portion therein and storing each of the one or more box-shaped battery cells in a space partitioned by the grid-like partition portion,
A battery pack characterized in that a first groove portion is provided in a part of an inner surface portion of the battery pack that comes into contact with a side of each battery cell when the battery cell is housed.   2. The first groove portion is provided at a peripheral edge portion of the innermost surface of the battery pack that is pressed by each battery cell when the battery cell is housed. The battery pack described.   The battery pack according to claim 1 or 2, wherein a member having flexibility is provided in the first groove portion.   4. The battery pack according to claim 1, further comprising a second groove provided in a part of an inner surface of the battery pack pressed by each of the battery cells. 5.   The battery pack according to claim 4, wherein a member having flexibility is provided in the second groove portion.

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