JP2021086797A - Battery pack and manufacturing method thereof - Google Patents

Abstract

To provide a battery pack that can flexibly respond to various designs, requires less effort during disassembly, and suppresses heat transfer between battery modules.SOLUTION: In a battery pack including a plurality of battery modules arranged in a battery case, and a heat insulating material arranged at least some of the plurality of battery modules, the heat insulating material is composed of a plurality of particles.SELECTED DRAWING: Figure 1

Description

The present invention relates to a battery pack and a method for manufacturing the battery pack. More specifically, the present invention relates to a battery pack including a plurality of battery modules composed of a plurality of unit cells and a method for manufacturing the same.

In a power supply for driving a motor such as an automobile, since charging and discharging with a large current are repeated, a plurality of unit cells (batteries) are connected in series or in parallel to form a battery module, and a plurality of battery modules are further connected in series or in parallel. Connected to and combined to meet the desired voltage and capacitance. A plurality of battery modules are housed in a case together with conductors such as a bus bar connecting them, a battery management unit, a junction box, and the like, and a battery pack is formed.

In order to make the outer shape of the battery pack compact, a plurality of battery modules are usually housed in a battery case in close proximity to each other. Depending on the usage pattern, the battery in each battery module may reach a high temperature state due to heat generation. In particular, in a battery module or battery pack in which batteries are densely assembled, the heat generated by one battery can affect other adjacent batteries. Specifically, in a battery module composed of a plurality of batteries, when one battery starts thermal runaway, adjacent batteries are also likely to cause thermal runaway. When a plurality of batteries are chained to cause thermal runaway, the temperature may be higher than that of a single battery. In this way, if one battery module causes thermal runaway, it may induce thermal runaway of adjacent battery modules, resulting in an extremely high temperature and a dangerous state.

In order to avoid the influence of the thermal runaway of the battery module on the surroundings, a method of arranging a plate-shaped heat insulating material between the battery modules is known. For example, in Patent Document 1, in a power supply device in which a plurality of battery modules 1 are housed in a rack 5, each battery module 1 has a battery block 14 composed of a plurality of rechargeable batteries in a fireproof heat insulating case 2. A heat insulating plate 4 is laminated on the top plate of the fireproof heat insulating case 2 facing the adjacent battery module, and a partition wall for blocking heat from the adjacent battery module is contained in the rack 5. It is stated that 10A is provided. Further, Patent Document 2 describes that a rectangular and flat plate-shaped heat insulating material 200 is arranged between a plurality of power storage modules 100.

Japanese Unexamined Patent Publication No. 2013-251127 Japanese Unexamined Patent Publication No. 2015-195136

By providing a plate-shaped heat insulating material between the battery modules as described in Patent Documents 1 and 2, heat transfer between the battery modules can be prevented. However, in the case of Patent Document 1, it is necessary to prepare a special case or rack that matches the shape of each battery module. Therefore, when the design of the outer shape of the final product such as an automobile equipped with the battery pack is changed, the design of the battery module or the battery pack may need to be changed accordingly. At that time, in Patent Document 1, it is necessary to remake the case and the rack having the heat insulating material in accordance with the design change of the battery module or the battery pack, which is troublesome and costly. That is, it can be said that the method of Patent Document 1 is difficult to flexibly respond to design changes. Further, in Patent Documents 1 and 2, since a plate-shaped heat insulating material is included as a component, there is a drawback that it takes time and effort to disassemble the battery pack when it is discarded.

An object of the present invention is to provide a battery pack including a plurality of battery modules, which can flexibly support various designs while suppressing heat transfer between battery modules, and requires less labor during disassembly. ..

As a result of diligent studies on the above objectives, instead of the conventional plate-shaped heat insulating material, a plurality of particles are used as the heat insulating material and arranged between the battery modules, thereby suppressing heat propagation between the battery modules and variously. We have found that it is possible to manufacture battery packs that can flexibly respond to various designs and that require less labor during disassembly. The present invention includes, but is not limited to, the following.
[1] A plurality of battery modules arranged at intervals from each other in a battery case, and a heat insulating material arranged at least a part between the plurality of battery modules.
A battery pack comprising: The insulating material is composed of a plurality of particles.
[2] The battery pack according to [1], wherein at least a part of the plurality of particles constituting the heat insulating material has a hollow structure.
[3] The battery case includes an upper case and a lower case.
The battery pack according to [1] or [2], wherein the upper case has an injection means for injecting a plurality of particles constituting the heat insulating material into the battery case.
[4] The battery pack according to claim 3, wherein the injection means is a sealable opening provided in the upper case.
[5] In the lower case of the battery case, the plurality of battery modules are arranged at intervals from each other.
The plurality of particles constituting the heat insulating material are arranged in at least a part between the plurality of battery modules, and the upper case of the battery case is attached to the lower case in which the plurality of battery modules are arranged. , The method of manufacturing a battery pack according to [1] or [2], which comprises forming the battery case.
[6] In the lower case, the plurality of battery modules are arranged at intervals from each other.
The upper case is attached to the lower case in which the plurality of battery modules are arranged to form the battery case, and a plurality of particles constituting the heat insulating material are formed in the battery case through the injection means. The method of manufacturing a battery pack according to [3] or [4], which comprises injecting into.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to manufacture a battery pack that can flexibly support various designs while suppressing heat transfer between battery modules, and requires less labor during disassembly. Placing insulation between the battery modules reduces heat transfer between the battery modules. At this time, by using a plurality of particles as the heat insulating material, it is necessary to prepare a special member for heat insulating (for example, a plate-shaped heat insulating material arranged between the battery modules) according to the shape of the battery module or the battery case. It disappears. Further, by using a plurality of particles as the heat insulating material, it can be arranged between the battery modules by a simple procedure such as pouring between the battery modules, and it becomes possible to correspond to the battery modules and battery packs of various designs. Further, the plurality of particles used as the heat insulating material can be removed by a simple means such as suction with a vacuum cleaner or the like when the battery pack is disposed of. Further, by using a plurality of particles as the heat insulating material, disassembly becomes easier as compared with the case where a plate-shaped heat insulating material is used.

When at least a part of the plurality of particles constituting the heat insulating material is a particle having a hollow structure, it is possible to suppress an increase in weight due to the particles while suppressing heat transfer between battery modules.

If the upper case of the battery pack is provided with an injection means for injecting a plurality of particles constituting the heat insulating material into the battery case, after assembling the battery pack (that is, placing the battery module in the lower case and placing the battery module in the lower case). After attaching the upper case), it is possible to inject a plurality of particles constituting the heat insulating material into the battery pack through the injection means of the upper case. This is because the height of the side wall of the lower case is lower than the height of the placed battery module, and if you try to place the insulation without the upper case, the insulation may spill out of the case. It is convenient when there is. Such an injection means may be a sealable opening provided in the upper case. By injecting a plurality of particles constituting the heat insulating material into the battery case and then sealing the opening, it is possible to prevent the heat insulating material from spilling out of the battery pack.

The battery pack can be manufactured by arranging a plurality of battery modules in the lower case, arranging a heat insulating material in at least a part between the battery modules, and then attaching the upper case. Alternatively, it is manufactured by arranging a plurality of battery modules in the lower case, attaching the upper case to form the battery case, and then injecting a heat insulating material into the battery case through the injection means provided in the upper case. You can also do it. The latter method is used when the height of the side wall of the lower case is lower than the height of the placed battery module, and if the heat insulating material is placed without the upper case, the heat insulating material may spill out of the case. , A particularly convenient method.

It is a schematic top view which shows one Embodiment of the battery pack of this invention which shows the arrangement of the battery module and other members in a battery case. It is the schematic of the cross section taken along the line AA'of the battery pack of FIG. It is another schematic view of the cross section taken along the line AA'of the battery pack of FIG. It is a schematic top view which shows one Embodiment of the battery pack of this invention. It is a flow chart which shows an example of the manufacturing method of this invention. It is a flow figure which shows another example of the manufacturing method of this invention.

Hereinafter, the battery pack according to the embodiment of the present invention will be described with reference to the drawings. It should be noted that all of the embodiments described below show a specific example of the present invention. Numerical values, shapes, materials, components, positions of components, connection modes, and the like shown in the following embodiments are examples, and do not limit the present invention. In the following, as the battery pack, a battery pack using a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery for mounting on an electric vehicle (including a hybrid car and a plug-in hybrid car) will be described as an example. However, the present invention is not limited to this.

FIG. 1 is a schematic top view showing the arrangement of a battery module and other members in a battery case in an in-vehicle battery pack according to an embodiment of the present invention. The arrangement of FIG. 1 is an example, and the arrangement of each member in the battery case in the battery pack of the present invention is not limited to the aspect of FIG.

In FIG. 1, a plurality of battery modules 4 are arranged at intervals from each other in the lower case 1 constituting the battery case. The size of the interval between the plurality of battery modules 4 is not particularly limited. The plurality of battery modules may not be in contact with each other, but it is preferable that the plurality of battery modules are arranged closer to each other because the volumetric energy density increases. The size of the interval between the plurality of battery modules 4 is, for example, in the range of 1 cm to 4 cm, but is not limited thereto. When the distance between the plurality of battery modules 4 is 4 cm or less, it is not necessary to consider heat conduction due to air convection in the gap between the battery modules 4. Each of the plurality of battery modules 4 is composed of a plurality of unit cells (batteries) connected in parallel or in series (cells are not shown). The number of cells included in each battery module 4 is not particularly limited. If the number of cells contained in one battery module is small, the energy density per module is low, and if the number of cells is too large, it may become too heavy and difficult to handle. Therefore, for example, The number of cells included in each battery module 4 is preferably about 4 to 50. However, it is not limited to this. In the present invention, the cell constituting the battery module 4 is typically a lithium ion secondary battery. However, the present invention is also applicable to other batteries that require heat insulation, such as nickel-metal hydride batteries, lead batteries, nickel-cadmium batteries, and lithium metal batteries.

As shown in FIG. 2, the battery case is composed of a lower case 1 and an upper case 10, and after arranging necessary members such as a battery module 4 in the lower case 1, the upper case 10 is attached to the lower case 1. Is formed by. In the present invention, the members constituting the lower case 1 and the upper case 10 are not particularly limited, and members generally used as a battery case may be used. Examples of the member include metals such as iron, aluminum, titanium, nickel, cobalt, manganese, chromium, tungsten, and magnesium, one or more alloys thereof, and glass fiber reinforced resin, carbon fiber reinforced resin, and aramid fiber reinforced resin. Examples thereof include, but are not limited to, resins and fiber reinforced resins such as quartz fiber reinforced resins. The lower case 1 and the upper case 10 may be made of the same member or may be made of different members. For example, the lower case 1 may be made of metal and the upper case 10 may be made of resin, but the present invention is not limited thereto.

The plurality of battery modules 4 are connected by a conductor 7 such as a bus bar or a wire harness that electrically connects each battery module. The arrangement of the conductor 7 shown in FIG. 1 is an example, and the arrangement of the conductor 7 in the present invention is not limited to this. The plurality of battery modules are connected in series and / or in parallel by the conductor 7.

In the vehicle-mounted battery pack illustrated in FIG. 1, in addition to the battery module 4 and the conductor 7, terminals 2 and 3 for connecting to the outside, a battery management unit 5, a junction box 6, and a high-power connector 9 are included. It has been incorporated. The battery management unit 5 is an electronic device that monitors, manages, and controls the state of the battery module and / or cell, and receives, converts, calculates, and transmits data, and is a battery pack safety, performance, and / or. It plays a role in guaranteeing the life. The junction box 6 is a unit used for branching, relaying, and coupling electric power, and incorporates a relay, a precharge circuit, a fuse, a current sensor, and the like. The battery management unit, junction box, and high-power connector are usually included in the battery pack, but these are not essential elements in the present invention, and some of them may be omitted depending on the application of the battery pack. ..

At least a part between the plurality of battery modules 4 is arranged with a heat insulating material 8 composed of a plurality of particles, as will be described in detail below in relation to FIG.
FIG. 2 is a schematic view of a cross section taken along the line AA'of FIG. A plurality of battery modules 4 and conductors 7 such as a bus bar are arranged in the battery case formed by the upper case 10 and the lower case 1 of the battery case. In the present invention, the heat insulating material 8 composed of a plurality of particles is arranged at least a part between the plurality of battery modules 4.

The heat insulating material is a member that reduces heat propagation. In the present invention, a plurality of particles are used as the heat insulating material. Unless otherwise specified, a plurality of "insulation material is composed of a plurality of particles", "insulation material composed of a plurality of particles", and "plurality of particles constituting the heat insulating material" are used. It is intended that the heat insulating material is composed of only particles (particle groups). The plurality of particles constituting the heat insulating material may be a single type of particles or a mixture of a plurality of types of particles.

In the present invention, the heat transfer between the plurality of battery modules 4 is reduced by arranging the plurality of particles constituting the heat insulating material 8 in at least a part of the plurality of battery modules 4. As a result, when one of the battery modules causes thermal runaway and generates heat at a high temperature, the temperature rise due to heat propagation to the adjacent battery module is suppressed, and the thermal runaway is prevented from spreading to other battery modules. can do.

If the particle size of the plurality of particles constituting the heat insulating material 8 is too small, the packing density between the battery modules may increase, causing an increase in weight or a decrease in heat insulating properties. Further, if the particle size is too large, problems such as clogging in the injection path when injecting between battery modules may occur. Therefore, the particle size of the plurality of particles constituting the heat insulating material 8 is preferably, for example, about 10 μm to 5 mm. Further, for example, it may be about 100 μm to 5 mm, or may be about 500 μm to 5 mm. The smaller the particle size, the less likely it is to flow after being placed between the battery modules, which is preferable. Here, the "particle size" refers to a volume-based median diameter. The particle size can be measured using a laser diffraction type particle size distribution measuring device or a scanning electron microscope.

The plurality of particles constituting the heat insulating material preferably have an aspect ratio (major axis / minor axis) of 1 to 20, for example, about 1 to 5. The aspect ratio can be obtained by calculating the average value of the aspect ratios of about 20 particles using a scanning electron microscope.

The shape of each particle in the plurality of particles constituting the heat insulating material is not particularly limited, and may be any shape such as a spherical shape, a cubic shape, a rectangular parallelepiped shape, or an indefinite shape. , Or particles of a plurality of shapes may be mixed.

It is preferable that at least a part of the plurality of particles constituting the heat insulating material 8 has a hollow structure. By making at least a part of the plurality of particles into particles having a hollow structure, the weight of the particles can be reduced and the weight of the battery pack in which the particles are arranged can be reduced. Further, the hollow shape can enhance the effect of suppressing heat conduction between the battery modules. It is most preferable that all of the plurality of particles have a hollow structure, but a part of the plurality of particles may have a hollow structure according to the desired heat insulating performance. Preferably, on a volume basis, 80% or more of the plurality of particles have a hollow structure, more preferably 90% or more, further preferably 95% or more, and most preferably 100% a hollow structure. It is a particle to have.

The plurality of particles constituting the heat insulating material 8 preferably have a thermal conductivity of 1.00 W / mK or less, more preferably 0.80 W / mK or less, and preferably 0.50 W / mK or less. More preferably, it is 0.30 W / mK or less. Thermal conductivity can be measured using the stationary heat flow method or the hot wire method.

The plurality of particles constituting the heat insulating material 8 are preferably formed of a material having a melting point, a softening temperature, or a thermal decomposition temperature of 400 ° C. or higher. The temperature of the hot gas that can be generated by the thermal runaway of the cell can reach 400 ° C. or higher. The plurality of particles constituting the heat insulating material 8 need to withstand this temperature exposure. More preferably, the melting point, softening temperature, or thermal decomposition temperature is 600 ° C. or higher, and even more preferably 800 ° C. or higher.

Examples of materials forming a plurality of particles constituting the heat insulating material 8 are not limited to, for example, alumina, aluminum nitride, silicon nitride, silicon carbide, zirconia, boron nitride, quartz glass, borosilicate glass, and dioxide. Silicon, boron oxide, sodium oxide, steatite, forsterite, mulite, cordierite, itria, barium titanate, tricalcium phosphate, hydroxyapatite, zirconium silicate, lead zirconate titanate, calcium fluoride, calcia, Inorganic materials such as magnesia, macerite, mica, hot veil, and soda lime borosilicate glass, and organic materials such as polyimide can be mentioned. Among these, particles of an organic material having high heat resistance and low thermal conductivity such as polyimide, and particles of an inorganic material such as soda lime borosilicate glass having a hollow structure and having a reduced thermal conductivity are included. It is preferable to use it.

By "arranging the heat insulating material in at least a part between the plurality of battery modules", it means that the heat insulating material is present in a part or the whole of the gap formed by the plurality of battery modules. It is most preferable to arrange the heat insulating material in all the gaps of each of the plurality of battery modules from the viewpoint of heat insulating performance, but depending on the desired heat insulating performance, the heat insulating material may be arranged only between some battery modules. Good. For example, the heat insulating material may be arranged between one pair of battery modules, but the heat insulating material may not be arranged between another pair of battery modules. Alternatively, it may be arranged or filled so as to fill the heat insulating material between a pair of battery modules, or may be arranged in a part of the space between them. FIG. 1 shows an example in which the heat insulating material 8 is arranged in all of the plurality of battery modules 4, but the present invention is not limited thereto.

By "arranging" the heat insulating material, the presence of a plurality of particles constituting the heat insulating material means that the plurality of particles constituting the heat insulating material are densely arranged or filled without gaps between the battery modules. Alternatively, the particles may be loosely arranged so as to form a gap between the particles.

In the present invention, the heat insulating material is arranged in "at least a part between a plurality of battery modules" as described above, but a plurality of particles constituting the heat insulating material are also present in other places. You may be. For example, when a plurality of particles constituting the heat insulating material are injected and arranged between the plurality of battery modules 4, some of the particles may flow out to a place other than a predetermined place. As long as the insulation is placed "at least in part" between the plurality of battery modules, it is included in the present invention.

FIG. 2 shows an example in which the heat insulating material 8 is arranged from the bottom surface of the lower case 1 to a position lower than the upper end of the battery module 4 in the gap formed by a pair of battery modules 4. FIG. 3 shows an example in which the heat insulating material 8 is arranged from the bottom surface of the lower case 1 to the same height as the upper end of the battery module 4 in the gap formed by a pair of battery modules 4. The height at which the heat insulating material 8 is arranged is not limited to these, but as shown in FIGS. 2 and 3, it is preferable that the height is equal to or lower than the upper end of the adjacent battery module 4. Preferably, the height h in which the heat insulating material 8 is arranged is 80% or more and 100% or less of the height H of the arranged battery module 4 (that is, from the bottom surface of the lower case 1 to the upper end of the battery module 4). Is preferable. When the height h in which the heat insulating material 8 is arranged is 80% or more of the height H of the battery module, heat propagation between the battery modules can be suppressed more reliably. On the other hand, when the height is 100% or less, the uppermost surface of the battery module 4 is not covered with the heat insulating material 8, so that heat dissipation of the battery module 4 can be promoted, and high temperature gas is generated during thermal runaway. It will allow gas to escape from the top of the battery module.

The heat insulating material 8 may be arranged at any other place in addition to at least a part between the plurality of battery modules 4. For example, it may be arranged between the battery module 4 and the battery management unit 5.

FIG. 3 is another schematic view of the cross section taken along the line AA'of FIG. The difference from FIG. 2 is that the heat insulating material 8 is arranged to the same height as the upper end of the battery module 4, and the upper end of the side wall of the lower case 1 of the battery case is arranged at the upper ends of the plurality of battery modules 4. It is a point at a lower position than. The heat insulating material 8 composed of a plurality of particles is arranged between the plurality of battery modules 4 as in the case of FIG. When the upper end of the battery module 4 is higher than the upper end of the side wall of the lower case 1 of the battery case as shown in FIG. 3, the heat insulating material 8 is provided between the battery modules 4 before the upper case 10 is attached. When a plurality of particles constituting the heat insulating material 8 are arranged, the particles constituting the heat insulating material 8 may spill out beyond the upper end of the side wall of the lower case 1. In this case, it is preferable to attach the upper case 10 to the lower case 4 after arranging the plurality of battery modules 4, and then inject the plurality of particles constituting the heat insulating material 8 into the battery case.

When a plurality of particles constituting the heat insulating material 8 are injected into the battery case after the upper case 10 is attached, the upper case 10 is an injection means for injecting a plurality of particles constituting the heat insulating material 8 into the battery case. It is preferable to have 11. FIG. 4 is a schematic top view showing an embodiment of the battery pack of the present invention, and the upper case 10 is provided with an injection means 11 for injecting a plurality of particles constituting the heat insulating material 8 into the battery case. .. FIG. 4 is an example of the arrangement and shape of the injection means 11, and the arrangement, number, shape and the like of the injection means 11 are not limited to the mode described in FIG. A plurality of injection means 11 may be provided in the upper case 10, or one may be provided.

Specific examples of the injection means 11 include a sealable opening provided in the upper case 10. In this case, a plurality of particles constituting the heat insulating material 8 can be injected into the battery case through the opening, and the plurality of particles can be arranged at least a part between the plurality of battery modules. The method of injecting the plurality of particles constituting the heat insulating material into the battery case is not particularly limited, and for example, a tubular member (not shown) is inserted into the opening to fill the particles at a desired position in the battery case. It can be injected by a method such as.

The above opening may be an opening for attaching the pedestal of the service plug to the upper case 10 of the battery pack. In this case, after injecting a plurality of particles constituting the heat insulating material 8 from the opening into the battery case, a service plug pedestal (not shown) is attached to the opening, and then a service plug (not shown) is attached to the pedestal. ) May be attached. The service plug is a plug having a function of cutting off a high-voltage circuit so that the work can be performed safely when performing work such as inspection of a battery pack.

After injecting a plurality of particles constituting the heat insulating material 8 into the battery case through the opening, it is preferable to seal the opening. By forming the battery case in a sealed structure, it is possible to prevent a plurality of particles constituting the heat insulating material in the battery case from spilling out. The method of sealing the opening is not particularly limited, and the opening may be sealed with a sheet or a plate-shaped member using a conventional method. For example, a combination of a service plug pedestal and a service plug may be used to seal the opening.

Next, an example of the method for manufacturing the battery pack of the present invention will be described with reference to a flow chart. The flow of the manufacturing method described below is an example of the method of the present invention and does not limit the present invention.

FIG. 5 is an example showing the flow of the method for manufacturing the battery pack of the present invention. The flow of FIG. 5 is particularly suitable when the height of the upper end of the lower case 1 of the battery case as shown in FIG. 2 is higher than the height of the upper ends of the plurality of arranged battery modules 4. .. In the flow of FIG. 5, first, a plurality of battery modules 4 are arranged in the lower case 1. Next, the junction box 6 is arranged in the lower case 1, the plurality of battery modules 4 are connected by a bus bar (conductor 7), and the battery management unit 5 is arranged in the lower case 1. Next, the plurality of particles constituting the heat insulating material 8 are arranged in at least a part between the plurality of battery modules 4. After the heat insulating material 8 is arranged at a desired position, the upper case 10 is attached to the lower case 1 and sealed to form a battery pack.

FIG. 6 is another example showing the flow of the method for manufacturing the battery pack of the present invention. In the flow of FIG. 6, the height of the upper end of the lower case 1 of the battery case as shown in FIG. 3 is lower than the height of the upper ends of the plurality of arranged battery modules 4, and the upper case 10 is not attached. When a plurality of particles constituting the heat insulating material 8 are to be arranged between the plurality of battery modules 4, the plurality of particles constituting the heat insulating material 8 may overflow beyond the upper end of the lower case 1 to the outside. This is a particularly suitable flow. In the flow of FIG. 6, as shown in FIG. 4, a battery pack is manufactured in which the upper case 10 is provided with the injection means 11 for injecting a plurality of particles constituting the heat insulating material 8 into the battery case. In the flow of FIG. 6, as an example of the injection means 11, the upper case 10 is provided with an opening (service plug portion) for attaching a service plug pedestal. The flow of FIG. 6 is the same as the flow of FIG. 5 until the battery management unit 5 is arranged in the lower case 1. In the flow of FIG. 6, the upper case 10 is then attached to the lower case 1 and sealed. Next, a plurality of particles constituting the heat insulating material 8 are injected into the battery case through an opening (service plug portion) for attaching the service plug pedestal arranged in the upper case 10, and between the plurality of battery modules 4. Place at least part of it. After arranging the heat insulating material 8, the service plug pedestal is attached to the opening of the upper case 10, and then the service plug is attached to the pedestal to form a battery pack.

In the present invention, by using a plurality of particles as the heat insulating material between the battery modules, a special member for heat insulating according to the shape of the battery module or the battery case (for example, a plate-shaped heat insulating material arranged between the battery modules, etc.) ) Is not required to be molded. Further, the plurality of particles constituting the heat insulating material can be arranged between the battery modules by a simple procedure such as pouring between the battery modules, and can be applied to battery modules and battery packs of various designs. In addition, the plurality of particles constituting the heat insulating material can be removed by a simple means such as suction with a vacuum cleaner or the like, and the battery pack can be disassembled at the time of disposal as compared with the conventional example using the plate-shaped heat insulating material. It's easy.

1 Lower case 2 Terminal 3 Terminal 4 Battery module 5 Battery management unit 6 Junction box 7 Conductor 8 Insulation material composed of multiple particles 9 High-power connector 10 Upper case 11 Multiple particles constituting the insulation material are placed in the battery case. Injection means to inject

Claims (6)

A plurality of battery modules arranged in a battery case at intervals from each other, and a heat insulating material arranged at least a part between the plurality of battery modules.
A battery pack comprising: The insulating material is composed of a plurality of particles. The battery pack according to claim 1, wherein at least a part of the plurality of particles constituting the heat insulating material has a hollow structure. The battery case consists of an upper case and a lower case.
The battery pack according to claim 1 or 2, wherein the upper case has an injection means for injecting a plurality of particles constituting the heat insulating material into the battery case. The battery pack according to claim 3, wherein the injection means is a sealable opening provided in the upper case. In the lower case of the battery case, the plurality of battery modules are arranged at intervals from each other.
The plurality of particles constituting the heat insulating material are arranged in at least a part between the plurality of battery modules, and the upper case of the battery case is attached to the lower case in which the plurality of battery modules are arranged. The method for manufacturing a battery pack according to claim 1 or 2, which comprises forming the battery case. In the lower case, the plurality of battery modules are arranged at intervals from each other.
The upper case is attached to the lower case in which the plurality of battery modules are arranged to form the battery case, and a plurality of particles constituting the heat insulating material are formed in the battery case through the injection means. The method of manufacturing a battery pack according to claim 3 or 4, which comprises injecting into.

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