Battery Pack

Abstract

The problem to be solved by the present invention is to provide a battery pack having excellent energy density and durability. In order to solve the above problem, a battery pack 100 is provided, which is composed of a solid battery module 102 and an electrolyte battery module 32, and these modules are accommodated in the battery pack, wherein the solid battery module 102 is stacked with a plurality of solid battery cells containing a solid electrolyte, and the electrolyte battery module 32 is stacked with a plurality of electrolyte battery cells containing an electrolyte, wherein the solid battery module 102 is arranged in a manner of surrounding the electrolyte battery module 32.

Description

Technical Field

[0001] The invention relates to a storage battery pack. Background Art

[0002] At present, a power supply system is known that is composed of batteries with different characteristics. Patent document 1 discloses a high-reliability vehicle power supply system, which is a hybrid power supply composed of a secondary battery and a capacitor other than a lead-acid battery, and a lead-acid battery is further connected in parallel to the hybrid power supply.

[0003] [Prior Technical Literature]

[0004] (Patent Document)

[0005] Patent Document 1: International Publication No. 2015 / 015743 Summary of the invention

[0006] [Problems to be solved by the invention]

[0007] Batteries with different characteristics have different usable temperature ranges. In particular, batteries that use electrolytes as electrolytes require precise temperature management because battery performance is greatly affected by the temperature of the electrolyte. Therefore, when combining electrolyte batteries with other batteries, the temperature control system tends to be complicated and large-scale.

[0008] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to simplify a temperature control system and to increase energy density and durability in a battery pack composed of a lithium-ion battery and other batteries.

[0009] [Technical means to solve the problem]

[0010] (1) The present invention provides a battery pack (e.g., battery pack 100 described below), which combines a solid battery module (e.g., solid battery module 102 described below) and an electrolyte battery module (e.g., electrolyte battery module 32 described below), and accommodates these modules in the battery pack, wherein the solid battery module is stacked with a plurality of solid battery cells containing a solid electrolyte, and the electrolyte battery module is stacked with a plurality of electrolyte battery cells containing an electrolyte, wherein the solid battery module is arranged in a manner surrounding the electrolyte battery module.

[0011] According to the invention of (1), the temperature range in which the solid battery can be used is increased, and it is sufficient to cool the electrolyte battery portion. Therefore, compared with a battery pack consisting only of electrolyte batteries, the temperature control system in the battery pack can be simplified and miniaturized. As a result, the energy density of the battery pack can be increased, and the durability can be improved.

[0012] (2) In the invention of (1), the solid battery module is arranged in a vacuum environment.

[0013] According to the invention of (2), since the insulation performance of the solid battery module is improved, it is not easily affected by the outdoor temperature. As a result, the starting performance in cold areas is improved, and the degradation in tropical areas is suppressed. Furthermore, since the output related to the temperature control can be reduced, the temperature control system 33 can be further simplified.

[0014] (3) In the invention of (1) or (2), the solid battery module is a high-power battery module, and the electrolyte battery module is a high-capacity battery module.

[0015] According to the invention of (3), the functions of each battery module arranged inside and outside are separated, thereby giving priority to the solid battery module of the high-power battery module during high power and fast charging. By giving priority to the solid battery module, the heat generation of the electrolyte battery module is reduced, which can prevent degradation. Furthermore, since the solid battery module is arranged outside, the heat dissipation to the outside air is high, so the influence of heat transfer from the solid battery module to the electrolyte battery module is also relatively small.

[0016] (4) In the inventions of (1) to (3), the battery pack comprises: a solid battery module layer (e.g., the solid battery module layer 110 described later) having a first space (e.g., the first space 115 described later) and a plurality of the solid battery modules arranged in the first space; and an electrolyte battery module layer (e.g., the electrolyte battery module layer 130 described later) having a second space (e.g., the second space 135 described later) and the electrolyte battery modules arranged in the second space; and the solid battery module layers are stacked and arranged on the electrolyte battery module layer, and the first space has at least a support portion (e.g., the support portion 106 described later) inside the first space for supporting the first space along the stacking direction of the solid battery module layers.

[0017] According to the invention of (4), the strength of the first space is improved, and it is not easily damaged even by external impact, and it is possible to prevent leakage of electrolyte from the electrolyte battery module. That is, the durability and safety of the battery pack are improved.

[0018] (5) In the invention of (4), the support portion is configured to include a solid battery.

[0019] According to the invention of (5), since the volume of the solid batteries in the battery pack can be increased, the energy density of the battery pack is improved.

[0020] (Effects of the Invention)

[0021] According to the present invention, in a battery pack, a temperature control system is simplified and energy density is increased, and durability can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure shows a conventional battery pack 10 in which air 14 is sealed.

[0023] Figure 2 1 is a diagram showing a battery pack 20 including a conventional electrolyte battery module 22 .

[0024] Figure 3 1 is a diagram showing a battery pack 100 according to a first embodiment of the present invention.

[0025] Figure 4 It is a diagram showing an electrolyte solution battery module layer 130 of the present invention.

[0026] Figure 5 It is a diagram showing a battery pack 200 according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to explain the features and effects of the present invention, first, a conventional battery pack 10 for an electrolyte battery having the same basic structure as that of the present invention will be explained.

[0028] Figure 1 1 is a cross-sectional view showing the structure of a battery pack 10 for electrolyte-based batteries sealed with ambient air 14 in a conventional assembly environment. The battery pack 10 is configured to include a box-shaped housing 15, a plurality of electrolyte-based battery modules 12 housed in the housing 15, a temperature control system 13 disposed between the electrolyte-based battery modules 12 and the housing 15, ambient air 14 in the assembly environment, and other auxiliary parts 11. The auxiliary parts 11 are parts such as contactors, DC / DC converters, and balancing circuits, which generate heat as the battery is used.

[0029] The electrolyte battery module 12 is composed of a plurality of electrolyte battery cells containing electrolyte in layers. The type of electrolyte battery cell is not particularly limited, and it can be a stacked cell or a metal can cell. Since the electrolyte battery module 12 is sealed with air inside, it will be affected by the heat from the auxiliary parts 11 or the outdoor temperature and cause temperature changes. If the electrolyte reaches a high temperature, the required battery performance cannot be obtained. In addition, the electrolyte battery itself will deteriorate at high temperatures. In addition, if the electrolyte reaches a low temperature in cold areas, the internal resistance of the battery will increase, so the startup will be slow and the responsiveness will be reduced.

[0030] Figure 22 is a diagram showing a battery pack 20 having a conventional electrolyte battery module 22. In order to maintain the temperature of the electrolyte battery module 22 within a certain range, the battery pack 20 is provided with a temperature control system 23. However, in order to increase the battery capacity, a plurality of electrolyte battery modules 22 are accommodated, and the temperature control system 23 is enlarged, resulting in an increase in the volume and weight of the battery pack 20 and a decrease in energy density. For example, in Figure 2 In the illustrated storage battery pack 20 for electrolyte-based batteries, the electrolyte-based battery module 22 may be enlarged due to the temperature control system 23 .

[0031] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the following embodiments.

[0032] <First embodiment>

[0033] The battery pack 100 according to the first embodiment of the present invention is configured to include a plurality of solid battery module layers 110 and an electrolyte battery module layer 130 . The electrolyte battery module layer 130 is disposed between the plurality of solid battery module layers 110 .

[0034] Figure 3 FIG. 1 is a diagram showing the structure of a battery pack 100 according to a first embodiment of the present invention. Figure 3 In the figure, the auxiliary parts 101 are omitted. The battery pack 100 is configured to have, for example, Figure 3 The rectangular housing 105 is shown. The housing 105 has a plurality of solid battery module layers 110 in which the solid battery modules 102 are housed, and an electrolyte battery module layer 130 in which the electrolyte battery modules 32 are housed. The housing 105 is formed of, for example, a metal box.

[0035] The electrolyte battery module layer 130 has an electrolyte battery module 32, a temperature control system 33, and ambient air 34 of an assembly environment. Figure 1 The conventional battery pack 10 shown is constructed in the same manner.

[0036] The solid battery module 102 is structured by stacking a plurality of solid battery cells. Figure 1 Unlike the conventional storage battery pack 10 shown, the electrolyte battery module 12 is composed of a solid battery module 102 .

[0037] The solid battery module 102 has a wide usable temperature range, which is sufficient to cool the electrolyte battery module 32. Therefore, the temperature control system 33 is only configured on the electrolyte battery module layer 130. That is, the solid battery module 102 is used in combination with the electrolyte battery module 32, thereby simplifying and miniaturizing the temperature control system 33 compared to the battery pack 10 composed only of the electrolyte battery module 12. As a result, the energy density of the battery pack 100 is increased, and the durability can be improved. The solid battery module layer 110 can be configured on at least one side of the electrolyte battery module 32.

[0038] Furthermore, a vacuum is formed inside the housing 105. In the housing 15 containing the electrolyte battery module 12, it is difficult to form a vacuum inside the housing 15 from the viewpoint of preventing leakage of the electrolyte. By using the solid battery module 102, the inside of the housing 105 of the solid battery module layer 110 can be made a vacuum.

[0039] The interior of the shell 105 of the solid battery module layer 110 is made into a vacuum, thereby improving the insulation performance. As a result, the electrolyte battery module layer 130 sandwiched by multiple solid battery module layers 110 is also insulated from the solid battery module layer 110, so that it is not easily affected by the outdoor temperature. Therefore, the battery pack 100 is not easily affected by the outdoor temperature, the starting performance in cold areas is improved, and the degradation in tropical areas is suppressed. Furthermore, since the relevant output of temperature control can be reduced, the temperature control system 33 can be further simplified.

[0040] Figure 4 It is a diagram showing an electrolyte solution battery module layer 130 of the present invention.

[0041] The electrolyte battery module layer 130 may also have a structure such as Figure 4 The insulating material 37 is shown. As a result, heat transfer to the housing 105 is also reduced, so the temperature control system works more effectively.

[0042] In the housing 105, the portion related to the solid battery module layer 110 is defined as a first space 115, and the portion related to the electrolyte battery module layer 130 is defined as a second space 135. Figure 3 Extending in the up-down direction, and having Figure 3 The support portion 106 supports the first space 115 in the vertical direction. As a result, the durability of the battery pack 100 against external impacts and the like is improved, and leakage of electrolyte from the electrolyte battery module 32 can be prevented. That is, the durability and safety of the battery pack 100 are improved. By preventing leakage of electrolyte, for example, in a car equipped with the battery pack 100, the spread of fire in the event of a side collision accident can be prevented.

[0043] Preferably, the support portion 106 is Figure 3 The first space 115 is also supported from the front to the back of the paper. As a result, the strength of the solid battery module layer 110 is further improved, and the durability is also improved.

[0044] The support portion 106 is configured to include the solid battery or the solid battery module 102. The support portion 106 can be formed by utilizing the mechanical strength of the solid battery itself. As a result, the volume of the solid battery in the battery pack 100 can be increased, and thus the energy density of the battery pack 100 is improved.

[0045] The first embodiment of the present invention has been described above.

[0046] <Second embodiment>

[0047] Next, a second embodiment of the present invention will be described. A battery pack 200 according to the second embodiment of the present invention is different from the battery pack 100 according to the first embodiment in the arrangement of the solid battery modules 202 and the electrolyte battery modules 32 .

[0048] Figure 5 FIG. 2 is a diagram showing a structure of a battery pack 200 according to a second embodiment of the present invention. Figure 5 In the figure, only the side wall portions are shown for the shell 205 and the shell 215, but in fact, the battery pack 200 also has a top plate and a bottom plate orthogonal to each side wall portion, and is formed into a two-layer box shape. In addition, the top plate or the bottom plate of the shell 215 is provided with a temperature control system 213 (not shown).

[0049] Inside the shell 215 is a sealed second space 214, which accommodates the stacked monomer electrolyte battery module 232 and the metal can monomer electrolyte battery module 242, and the air of the assembly environment is sealed inside. On the outside of the shell 215, the solid battery module 202 is arranged in a manner to surround the electrolyte battery modules 232 and 242 inside the shell 215. Furthermore, the shell 215 is accommodated inside the shell 205, and the first space 204 between the shell 215 and the shell 205 is formed as a vacuum. In addition, in Figure 5 In the embodiment, the battery pack 200 includes both the stacked cell type electrolyte battery module 232 and the metal can cell type electrolyte battery module 242, but the selection of the cells of the electrolyte battery module is not particularly limited. They may be used in combination or may be composed of only one type.

[0050] Thus, by using the solid battery module 202 in combination with the electrolyte battery modules 232 and 242 , the energy density of the battery pack 200 can be increased, and the durability can be improved, compared to the battery pack 10 composed of only electrolyte batteries.

[0051] Furthermore, the first space 204 has a high thermal insulation because it is placed in a vacuum environment. Therefore, the startup performance in cold regions is improved, and the degradation in tropical regions is suppressed. Furthermore, since the output related to temperature control can be reduced, the temperature control system 213 can be further simplified.

[0052] In the battery pack 200, the solid battery module 202 is a high-power battery module, and the electrolyte battery modules 232 and 242 are high-capacity battery modules. The functions of each battery module arranged inside and outside are separated, and the solid battery module 202, which is a high-power battery module, is used preferentially during high power and fast charging.

[0053] The solid battery module 202 is used preferentially, thereby reducing the heat generation of the electrolyte battery modules 232 and 242 and preventing degradation. Furthermore, since the solid battery module 202 is arranged on the outside, the heat dissipation from the shell 205 to the outside air is high, so the influence of heat transfer from the solid battery module 202 to the electrolyte battery modules 232 and 242 via the shell 215 separating them is also relatively small.

[0054] The second embodiment of the present invention has been described above.

[0055] The present invention is not limited to the first and second embodiments described above, and modified and improved embodiments thereof are also included in the present invention. As a modified example of the present invention, for example, multiple storage battery packs 100, 200 of the above embodiments may be connected to increase the capacity and used. Solid batteries have high high temperature durability, and have sufficient durability even in high-capacity batteries at high temperatures.

[0056] As an applicable position of the present invention, it can be placed on the lower part of a vehicle, for example. By placing the solid battery module 102 with high high temperature durability on the lower side of the vehicle, it is possible to suppress deterioration caused by heat radiation from the road surface. Furthermore, the solid battery module 102 has a vacuum portion to improve the thermal insulation, so that the electrolyte battery module 32 can be protected.

[0057] Furthermore, a high-strength solid battery module 102 is also arranged on the side of the vehicle, thereby protecting the electrolyte battery module 32 from the impact of a side collision accident, etc., preventing leakage of the electrolyte and reducing the possibility of fire spreading.

[0058] Reference numerals

[0059] 10 Conventional battery packs

[0060] 11 Auxiliary parts

[0061] 12 Battery Module

[0062] 13. Temperature control system

[0063] 14 Air

[0064] 15 Housing

[0065] 20 Conventional electrolyte battery packs

[0066] 22 Electrolyte battery module

[0067] 23 Temperature control system

[0068] 24 Air

[0069] 25 Shell

[0070] 32 electrolyte battery module

[0071] 33 Temperature control system

[0072] 34 Air

[0073] 37 Insulation Materials

[0074] 100 Battery Pack

[0075] 101 Auxiliary parts

[0076] 102 solid battery module

[0077] 104 Vacuum Area

[0078] 105 Housing

[0079] 106 Supporting part

[0080] 110 solid battery module layer

[0081] 115 First Space

[0082] 130 electrolyte battery module layer

[0083] 135 Second Space

[0084] 200 Battery Pack

[0085] 202 solid battery module

[0086] 204 First Space

[0087] 205 Shell

[0088] 214 Second Space

[0089] 215 Shell

[0090] 232 stacked monomer electrolyte battery module

[0091] 242 cans of single-cell electrolyte battery module

Claims

1. A battery pack, comprising a solid battery module and an electrolyte battery module, wherein the solid battery module and the electrolyte battery module are housed in the battery pack, wherein the solid battery module is a stack of a plurality of solid battery cells containing a solid electrolyte, and the electrolyte battery module is a stack of a plurality of electrolyte battery cells containing an electrolyte. The solid battery module is arranged so as to surround the electrolyte battery module. in, The solid battery module is placed in a vacuum environment. The aforementioned battery pack has: a solid battery module layer having a first space and the solid battery module disposed in the first space; and an electrolyte battery module layer having a second space and the electrolyte battery module disposed in the second space; Furthermore, the solid battery module layers are stacked and arranged on the electrolyte battery module layers. The first space has a support portion therein for supporting the first space in any one direction of a stacking direction of the solid battery module layers and a direction perpendicular to the stacking direction.

2. The battery pack according to claim 1, wherein: The aforementioned solid battery module is a high-power battery module. The aforementioned electrolyte-based battery module is a high-capacity battery module.

3. The battery pack according to claim 1, wherein: The support portion is configured to include a solid battery.

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