KR101949473B1 - Secondary batter and battery pack including the same - Google Patents

Abstract

The present invention discloses a secondary battery having improved heat retention ability through an improved structure of a casing. A secondary battery according to one aspect of the present invention includes: a positive electrode plate having a positive electrode current collector coated with a positive electrode active material; A negative electrode plate coated with a negative electrode active material on the negative electrode collector and arranged to face the positive electrode plate; An electrolyte interposed between the positive electrode plate and the negative electrode plate; And a heat insulating layer for accommodating the positive electrode plate, the negative electrode plate and the electrolyte in the inner space, and a heat insulating layer for blocking the movement of heat between the inside and the outside.

Description

[0001] The present invention relates to a secondary battery and a battery pack including the secondary battery,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a secondary battery, and more particularly, to a secondary battery having improved heat retention capability through an improved structure of a casing and a battery pack including the same.

2. Description of the Related Art Generally, a secondary battery is a battery that can be charged and discharged unlike a primary battery which can not be charged, and is widely used in various fields and devices such as a mobile phone, a notebook computer, a camcorder, Currently commercialized secondary batteries include nickel cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Metal-air batteries, all-solid batteries, sodium-based batteries, and magnesium batteries are of interest and development as next- have.

Among these various secondary batteries, the lithium secondary battery has a remarkable advantage in that it has almost no memory effect compared with a nickel-based secondary battery, is chargeable and dischargeable, has a very low self-discharge rate, and has high energy density.

Generally, such a secondary battery can be classified into a can-type secondary battery and a pouch-type secondary battery depending on the external appearance and application form.

Fig. 1 is a cross-sectional view showing the construction of a general pouch-type secondary battery, and Fig. 2 is an enlarged view of a portion A in Fig.

As shown in FIGS. 1 and 2, the pouch type secondary battery includes an electrode assembly 20 and a pouch outer casing 10. As shown in FIG.

Here, the pouch outer casing 10 may be composed of an upper pouch T and a lower pouch B, and the electrode assembly 20 may be accommodated in the inner space formed by the upper pouch T and the lower pouch B. The pouch sheathing material 10 may be formed to have a predetermined layered structure having an order of the outer insulating layer 13, the metal layer 12, and the inner adhesive layer 11 from the outside to the inside in this order. Therefore, the pouch outer casing 10 can be sealed by bonding the inner bonding layer 11 of the upper pouch T and the inner bonding layer 11 of the lower pouch B to each other at the sealing portion.

The electrode assembly 20 of the lithium secondary battery can mainly use a lithium-based oxide and a carbonaceous material as a cathode active material and an anode active material, respectively. That is, the electrode assembly may include a positive electrode plate and a negative electrode plate coated with the positive electrode active material and the negative electrode active material, respectively, and a separator may be interposed between the positive electrode plate and the negative electrode plate to prevent direct contact therebetween.

Inside the pouch case, an electrolyte is housed together with an electrode assembly, wherein the electrolyte is typically a liquid electrolyte, which is also referred to as an electrolyte. In the case of a secondary battery made of a liquid electrolyte, it is widely used due to various advantages such as easy handling and manufacturing, good electric conductivity at room temperature, and stable performance even at room temperature. However, in the case of such a liquid electrolyte cell, problems such as leakage of electrolyte or generation of gas may occur, and the safety of the secondary battery such as explosion, ignition, and discharge of harmful gas may be significantly deteriorated.

In such a situation, the use of a solid electrolyte makes it possible to prevent problems such as electrolyte leakage and gas generation, and to increase the interest and development of all solid-state batteries that can secure safety. Particularly, in the case of an electric vehicle or a power storage device, such as an electric charging station of an electric vehicle or a power storage device used for a smart grid, a large amount of secondary battery can be used, so that the expectation for a stable all- . However, in the case of such a pre-solid battery, since the ionic conductivity is low at room temperature, the operating temperature is relatively higher than that of the liquid electrolyte battery. Therefore, when a battery pack is constructed using all solid-state batteries, it is necessary to increase the temperature condition as compared with the liquid electrolyte battery.

Conventionally, efforts have been made to secure the performance of the entire solid-state battery in the direction of supplying heat from the outside of the secondary battery to the secondary battery side through a heater or the like. However, in this case, since a heater or the like needs to be provided outside the secondary battery, the manufacturing process is inferior, the structure of the battery pack becomes complicated, the volume increases, and a separate device for controlling the heater or supplying power to the heater is required. There is a problem that it may be an obstacle to cost reduction due to the increase in power consumption and equipment. Furthermore, in the case of a middle- or large-sized battery pack used for a power storage device, an automobile, or the like, many secondary batteries are stacked in a battery pack. However, depending on the position of the secondary battery, heat may not be properly supplied from the heater , It is difficult to secure uniform secondary battery performance as a whole.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a casing having improved structure so that ion conductivity can be stably secured even if a solid electrolyte is used as an electrolyte, It is intended to provide applications.

Other objects and advantages of the present invention will become apparent from the following description, and it will be understood by those skilled in the art that the present invention is not limited thereto. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to an aspect of the present invention, there is provided a secondary battery including: a positive electrode plate having a positive electrode collector coated with a positive electrode active material; A negative electrode plate coated with a negative electrode active material on the negative electrode collector and arranged to face the positive electrode plate; An electrolyte interposed between the positive electrode plate and the negative electrode plate; And a heat insulating layer for accommodating the positive electrode plate, the negative electrode plate and the electrolyte in the inner space, and a heat insulating layer for blocking the movement of heat between the inside and the outside.

Here, the electrolyte may be a solid electrolyte.

Further, the heat insulating layer may include a foam.

In addition, the foam may comprise one or more materials of EPS foam, XPS foam, polyethylene foam, polyurethane foam, water soft foam and urea foam.

Further, the heat insulating layer may include a gas layer.

Further, the heat insulating layer may include glass wool.

In addition, the heat insulating layer may include a plurality of unit layers arranged at a predetermined distance in the horizontal direction.

In addition, the casing may further include a metal layer, an outer insulating layer, and an inner adhesive layer.

Further, the heat insulating layer may be located between the outer insulating layer and the inner adhesive layer.

Further, the heat insulating layer may include a gas layer inside the metal layer.

The heat insulating layer may include a foam that is in contact with the metal layer.

Further, the heat insulating layer may be located on the outermost side of the casing.

Further, the heat insulating layer may be detachably attachable to the exterior material.

Further, the heat insulating layer may be formed of a plurality of layers having different materials.

According to another aspect of the present invention, there is provided a battery pack including the secondary battery according to the present invention.

According to another aspect of the present invention, there is provided an automobile comprising the secondary battery according to the present invention.

According to another aspect of the present invention, there is provided a power storage device including a secondary battery according to the present invention.

According to another aspect of the present invention, there is provided a casing for a secondary battery, the casing comprising: a metal layer made of a metal; An outer insulating layer formed of a polymer material and formed on the outer side of the metal layer; An inner adhesive layer formed of a polymer material and formed on the inner side of the metal layer; And a heat insulating layer for blocking heat movement in an outer direction in the inner space.

According to an aspect of the present invention, the heat retention performance of the secondary battery itself can be improved.

Therefore, in the case of the secondary battery according to the present invention, it is more suitable to use a solid electrolyte having a higher operating temperature than that of a liquid electrolyte as an electrolyte, and stable operating performance can be ensured even in this case.

Therefore, according to this aspect of the present invention, it is not necessary or necessary to provide a separate heating member such as a heater in order to ensure stable performance of the entire solid battery, The manufacturing cost and volume can be reduced, and the manufacturing processability can be improved.

Further, even when a plurality of secondary batteries are stacked to form a battery pack, it is possible to prevent temperature imbalance between the secondary batteries depending on the position, for example, the distance from the heater, thereby preventing the performance of the particular secondary battery from deteriorating can do.

Further, since the present invention can increase the utilization of the entire solid battery, various advantages such as electrolyte leakage and gas generation risk can be obtained.

However, the secondary battery according to the present invention is not limited to a full solid battery, but may be applied to various secondary batteries other than all solid batteries, which operate at a temperature higher than room temperature or have improved performance. In addition, the present invention can be applied to a battery in which the electrolyte is in a liquid state. In this case, the performance of the secondary battery can be more stably secured in a low ambient temperature such as winter.

Particularly, in the case of an automobile or a power storage device, the present invention can be applied to a general liquid electrolyte cell as well as an all solid battery cell, so that the performance of the secondary battery can be improved even when the temperature is low.

According to an aspect of the present invention, since the driving temperature can be controlled according to the material of the heat insulating material, it is possible to provide an optimal temperature condition according to the type of the secondary battery, thereby exhibiting stable performance.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further the understanding of the technical idea of the invention, And should not be construed as limiting.
1 is a cross-sectional view showing a configuration of a general pouch-type secondary battery.
2 is an enlarged view of a portion A in Fig.
3 is an exploded perspective view schematically showing a configuration of a pouch type secondary battery according to an embodiment of the present invention.
4 is an enlarged cross-sectional view schematically showing a cross section of a portion B in Fig.
FIG. 5 is a cross-sectional view schematically showing a configuration of a casing of a secondary battery according to another embodiment of the present invention. FIG.
FIG. 6 is a cross-sectional view schematically showing a configuration of a casing of a secondary battery according to another embodiment of the present invention. FIG.
7 is a cross-sectional view schematically showing a configuration of a casing of a secondary battery according to another embodiment of the present invention.
8 is a perspective view schematically showing a configuration of a casing of a secondary battery according to another embodiment of the present invention.
FIG. 9 is a perspective view schematically showing a configuration of a casing of a secondary battery according to another embodiment of the present invention. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

3 is an exploded perspective view schematically showing a configuration of a pouch type secondary battery according to an embodiment of the present invention.

Referring to FIG. 3, a secondary battery according to the present invention includes an electrode assembly 200, an electrolyte, and a casing 100.

The electrode assembly 200 may include a positive electrode plate and a negative electrode plate.

Here, the positive electrode plate may be configured such that the positive electrode collector is coated with the positive electrode active material, and the negative electrode plate may be formed by coating the negative electrode collector with the negative electrode active material. That is, the electrode plates may be formed as a structure in which the active material slurry is applied to the current collector. The slurry may be formed by stirring the granular active material, the auxiliary conductor, the binder, the plasticizer, etc. with the solvent added.

Each of the electrode plates may have an uncoated portion to which no slurry is applied, and an electrode tab corresponding to each electrode plate may be formed on the uncoated portion. These electrode tabs, that is, the positive electrode tab 210 and the negative electrode tab 220, may have one or more of a positive electrode plate and a negative electrode plate, respectively. The positive electrode tab 210 and the negative electrode tab 220 may protrude from the positive electrode plate or the negative electrode plate and may be formed of the same material as that of the positive electrode collector or the negative electrode collector.

In the electrode assembly 200, the positive electrode plate and the negative electrode plate may be arranged to face each other. That is, the positive electrode plate and the negative electrode plate may be arranged in such a manner that their wide surfaces face each other, and a separator may be interposed therebetween to prevent direct contact between the positive electrode plate and the negative electrode plate.

As shown in FIG. 3, the electrode assembly 200 may be configured such that one positive electrode plate and a negative electrode plate are wound with a separator interposed therebetween. Alternatively, the electrode assembly 200 may be configured such that a plurality of positive and negative electrode plates are stacked with a separator interposed therebetween. At this time, a plurality of positive electrode plates and negative electrode plates may be provided with separate electrode tabs.

The electrolyte is interposed between the positive electrode plate and the negative electrode plate of the electrode assembly 200 so that ions, particularly lithium ions, can move between the positive electrode plate and the negative electrode plate for charging or discharging the secondary battery.

The secondary battery according to the present invention may employ various positive electrode plates, negative electrode plates and electrolytes known at the time of filing of the present invention, and a detailed description thereof will be omitted.

The outer casing 100 has a concave inner space as indicated by R in the figure, and the electrode assembly 200 and the electrolyte can be accommodated in the inner space. The casing member 100 may be composed of an upper pouch T and a lower pouch B to facilitate insertion of the electrode assembly 200. [ The upper and lower pouches T and B may have a concave space for accommodating the electrode assembly 200. The upper pouch T and the lower pouch B may be formed in the upper and lower pouches T and B. However, B may be formed in any one of concave shapes.

The upper pouch T and the lower pouch B are provided with the sealing portion S at the edge of the inner storage space and the sealing portions are adhered to each other so that the inner storage space can be sealed.

In particular, the casing member 100 of the secondary battery according to the present invention may include a heat insulating layer.

4 is an enlarged cross-sectional view schematically showing a cross section of a portion B in Fig.

Referring to FIG. 4, in the secondary battery according to the present invention, the casing member 100 may include a heat insulating layer 110 on at least one side thereof.

The heat insulating layer 110 may be configured to block the movement of heat between the inside and the outside. 4, the lower side of the casing member 100 may be the inner side where the electrode assembly 200 is located, and the upper side of the casing member 100 may be the outer side of the secondary battery. It is possible to prevent the heat from moving from the lower portion to the upper portion through the casing member 100 by more than a certain level.

For example, the heat insulating layer 110 may be made of a material having a thermal conductivity of 0.1 W / mK or less at room temperature. More preferably, the heat insulating layer 110 may be made of a material having a thermal conductivity of 0.05 W / mK or less.

As described above, in the case of the secondary battery according to the present invention, heat loss from the inside to the outside of the secondary battery can be reduced or eliminated owing to the heat insulating layer 110. Therefore, the temperature of the internal space where the electrode assembly 200 and the electrolyte are located Can be maintained at a predetermined temperature or higher. For example, in the case of the secondary battery according to the present invention, the temperature of the internal space can be maintained at 50 ° C or more due to the heat insulating layer 110.

Therefore, as the secondary battery according to the present invention, a secondary battery using an electrolyte which operates at a temperature higher than room temperature or whose performance is optimized can be used.

In particular, the electrolyte included in the secondary battery may be a solid electrolyte. This type of secondary battery can be referred to as a full solid battery. Such a pre-solid battery can be said to be a concept as compared with a secondary battery composed of an electrolyte in a normal liquid state since the electrolyte is in a solid state. For example, the secondary battery may be a lithium pre-solid battery. In this case, the lithium ions can move between the positive electrode and the negative electrode through the solid electrolyte. Such a pre-solid battery is superior in safety to a liquid electrolyte secondary battery because there is no leakage problem, and can be easily realized in a flexible shape. Further, the entire solid-state battery can be more easily made to minimize the thickness of the secondary battery and realize a high-voltage and high-density battery.

Such a pre-solid battery may not operate properly or exhibit its performance because its ionic conductivity is not high at room temperature due to the characteristics of a solid electrolyte. Therefore, in order for the entire solid-state battery to exhibit its performance, it is preferable to be driven in a high temperature environment higher than normal temperature. For example, the entire solid-state cell can be operated in a temperature environment of 50 ° C to 200 ° C or can exhibit optimal performance. In the case of the secondary battery according to the present invention, the heat insulating layer 110 is provided on the casing 100 so that a considerable amount of heat generated in the secondary battery can be retained in the internal space without being discharged to the outside. Therefore, in the case of the secondary battery according to the present invention, even if a solid electrolyte is included, its performance can be stably ensured.

Preferably, the insulating layer 110 may be configured to include a foam.

For example, in the configuration of FIG. 4, the heat insulating layer 110 may be made of an expanded polystyrene foam, an extruded polystyrene sheet foam, a polyethylene foam, a polyurethane foam, A foam, and a urea foam (Urea Foam).

According to this embodiment of the present invention, the heat insulating effect of the facer material 100 due to the insulating layer 110 can be improved, and the weight increase of the secondary battery due to the insulating layer 110 can be reduced. That is, in the case of the foam, the density is low and the weight of the secondary battery may not be greatly increased. Therefore, it may not be a great obstacle to achieving the light weight of the battery pack while securing the heat insulating property. Further, in the case of a material such as an aqueous soft foam, it can have flame retardancy that is good in heat insulation and does not burn well. In addition, in the case of the above-mentioned foamed material, there is no problem in securing the insulation property of the secondary battery because of its excellent electrical insulation.

The exterior material 100 may further include a metal layer 130, an external insulating layer 140, and an internal adhesive layer 120, as shown in FIG. 4, in addition to the heat insulating layer 110.

Here, the metal layer 130 can secure the mechanical strength of the casing member 100, and prevent the gas, moisture, and the like outside the secondary battery from flowing into the interior of the secondary battery. In particular, the metal layer 130 may be made of an aluminum material. In the case of aluminum, it is possible to secure a mechanical strength of a predetermined level or higher, but it is light in weight and can be easily prevented from penetrating foreign matter such as moisture. However, the present invention is not limited to such an aluminum material, and various materials other than aluminum may be used as the metal layer 130 of the present invention.

The outer insulating layer 140 may be formed of an electrically insulating material and may be formed on the outer side of the metal layer 130. Here, the outer side means a portion located in the opposite direction to the direction in which the electrode assembly 200 is positioned, that is, the outer direction of the secondary battery, with respect to the metal layer 130. For example, when referring to the upper pouch T as shown in FIG. 4, the outer side of the metal layer 130 may mean the upper side of the metal layer 130.

The outer insulating layer 140 is provided on the outer side of the secondary battery 130 to protect the metal layer 130 and the electrode assembly 200 from the outside and the electrode assembly 200 and the metal layer 130 So that it can be electrically insulated from the outside.

For this, the outer insulating layer 140 may be formed of a polymer material. For example, the outer insulating layer 140 may be formed of a material such as polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, acrylic polymer, polyacrylonitrile, polyimide, polyamide, cellulose, Polyester, polyparaphenylene, benzobisoxazole, polyarylate, and Teflon. [0035] The term " In particular, the outer insulating layer 140 may be formed of a material including polyethylene terephthalate (PET) and / or oriented nylon.

The internal adhesive layer 120 is made of a material having adhesiveness and can be formed on the inner side of the metal layer 130. The internal adhesive layer 120 may be formed of an insulating material so that the metal layer 130, the electrode assembly 200, or the metal layer 130 and the electrolyte can be electrically insulated. In addition, the inner adhesive layer 120 may be configured to be adhered to each other by applying heat and / or pressure to each other to provide sealing at the sealing portion. That is, the upper pouch T and the lower pouch B can be sealed at the sealing portion to seal the facings 100. Therefore, the inner pouch T and the lower pouch B, which are located on the innermost side of the upper pouch T, B may be adhered to each other.

As described above, the internal adhesive layer 120 may be made of a material having adhesiveness and electrical insulation. To this end, the inner adhesive layer 120 may be formed of a material selected from the group consisting of polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, an acrylic polymer, a polyacrylonitrile, a polyimide, a polyamide, a cellulose, an aramid, a nylon, Polytetrafluoroethylene, paraphenylene benzobisoxazole, polyarylate, and Teflon. Particularly, the internal adhesive layer 120 may be made of a material including a lead-free polypropylene (CPP).

The heat insulating layer 110 may be formed of a material different from that of the external insulating layer 140, the metal layer 130, and the internal adhesive layer 120. Particularly, since the insulating layer 110 has a role different from that of the external insulating layer 140, the metal layer 130 and the internal adhesive layer 120, a material having excellent heat insulating property can be used rather than securing mechanical properties.

The heat insulating layer 110 may be embedded in the exterior material 100. For example, when the facer material 100 includes the metal layer 130, the outer insulating layer 140, and the inner adhesive layer 120, the insulating layer 110 may include an outer insulating layer 140, And the internal adhesive layer 120. For example, as shown in FIG. 4, the heat insulating layer 110 may be interposed between the metal layer 130 and the external insulating layer 140. Alternatively, as shown in FIG. 5, the heat insulating layer 110 may be interposed between the metal layer 130 and the internal adhesive layer 120.

According to this configuration of the present invention, since the heat insulating layer 110 is not exposed to the outer surface of the facings 100, the heat insulating layer 110 is selected to have a heat insulating property, and mechanical strength and the like may not be considered. Since the insulating layer 110 is not exposed to the inner surface of the casing 100, the contact between the insulating layer 110 and the electrolyte or the contact between the insulating layer 110 and the electrode assembly 200 I do not care much.

Also, preferably, the heat insulating layer 110 may be configured to include a gas layer.

5 is a cross-sectional view schematically showing the configuration of a casing 100 of a secondary battery according to another embodiment of the present invention. FIG. 5 is another example of the portion B in FIG.

Referring to FIG. 5, the heat insulating layer 110 may include at least one closed space, and one or more gas elements may be filled in the closed space. For example, the heat insulating layer 110 may be configured such that air is trapped in a closed space. More specifically, the heat insulating layer 110 may have a partition wall, and a closed space for collecting the gas layer may be formed through the partition wall.

According to this embodiment of the present invention, the heat insulation performance can be ensured through the base layer, and the increase in the weight of the secondary battery due to the heat insulating layer 110 can be minimized. In addition, since the gas layer can absorb an external impact, the electrode assembly 200 and the like stored in the internal space of the secondary battery can be protected from external impacts.

In particular, the heat insulating layer 110 may include barrier ribs W, and the barrier ribs W may divide the closed space in which the base layer is held into a plurality of unit spaces. The gas is held in each of the plurality of unit spaces, and such gas can be configured to be located only in the unit space. That is, as shown by C in FIG. 5, a plurality of unit spaces are formed by the partitions, and the gas existing in the unit space is located only in the unit space, and may not move to another unit space.

According to this configuration of the present invention, the travel distance of the gas within the heat insulating layer 110 can be reduced. Therefore, the gas layer of a specific portion is lost or thinned due to the movement of the gas, thereby preventing the heat insulating performance from being partially weakened.

Here, as the heat insulating layer 110, a base layer may be provided on the inner side of the metal layer 130 in contact with the metal layer 130. For example, the exterior material 100 of the secondary battery may be configured such that an air layer is provided between the metal layer 130 and the internal adhesive layer 120, as shown in FIG.

According to this embodiment of the present invention, a gas layer is formed on the inner side of the metal layer 130, and the metal layer 130 and the gas layer can serve as the thermal reflection heat insulator. In particular, aluminum may be used as the metal layer 130 of the facer material 100, which may serve to reflect heat, in which case the gas layer is capable of enabling or enhancing thermal reflection of the metal layer 130 can do. Therefore, the heat generated at the electrode assembly 200 side is reflected by the metal layer 130 of the casing 100 and then supplied to the electrode assembly 200, Side temperature can be raised.

In addition, the heat insulating layer 110 may include various other materials. For example, the insulating layer 110 may include a glass wool. In the case of glass wool, it is low in weight, low in cost, and excellent in fire resistance, insulation, and corrosion resistance.

4 and 5, the heat insulating layer 110 is composed of a single kind of layer, but the present invention is not limited to this form. In particular, the heat insulating layer 110 may be formed of a plurality of layers having different materials.

6 is a cross-sectional view schematically showing the configuration of a casing 100 of a secondary battery according to another embodiment of the present invention.

Referring to FIG. 6, the heat insulating layer 110 may include a first heat insulating layer 111 and a second heat insulating layer 112. The first heat insulating layer 111 and the second heat insulating layer 112 may be made of different materials. For example, the first insulating layer 111 may be made of a material including a foam, and the second insulating layer 112 may be made of a material including a gas layer.

At this time, in the case of the first heat insulating layer 111 made of a foam material, it may be configured to contact the metal layer 130. In this case, due to the foam, the heat reflection efficiency of the metal layer 130, such as the aluminum layer, can be further improved. 6, in the case of the second heat insulating layer 112 formed in the form of a base layer, the heat insulating layer 111 is located below the first heat insulating layer 111, so that the heat reflecting efficiency of the metal layer 130 can be further increased .

7 is a cross-sectional view schematically showing the configuration of a casing 100 of a secondary battery according to another embodiment of the present invention.

6, the heat insulating layer 110 includes two heat insulating layers, that is, a first heat insulating layer 111 and a second heat insulating layer 112, as in FIG. 6, Are not in contact with each other and can be separated from each other with the metal layer 130 therebetween.

In other words, in the case 100 of the present invention, the heat insulating layer 110 may have two or more layers separated from each other. For example, as shown in Fig. 7, the exterior material 100 includes an inner insulating layer, an air layer as a second insulating layer 112, a metal layer 130, and a first heat insulating layer 111 The foam layer and the external insulating layer 140 may be stacked in this order.

8 is a perspective view schematically showing a configuration of a casing 100 of a secondary battery according to another embodiment of the present invention. More specifically, in FIG. 8, a part of the configuration of the pouch-type outer packaging material 100 is shown cut out for convenience of explanation.

Referring to FIG. 8, the heat insulating layer 110 may include a plurality of unit layers, and may be included in the exterior material 100. At this time, each of the unit layers may be arranged so as to be spaced apart from each other by a predetermined distance in the horizontal direction within the casing member 100.

For example, the insulating layer 110 may be formed of a glass wool material, and the glass wool may be formed in a lattice form on the upper surface of the metal layer 130. According to this configuration of the present invention, the insulating material 100 can be applied to the metal layer 130, the outer insulating layer 140, or the insulating layer 110 which is not easily fixed to the inner adhesive layer 120, So that it can be easily provided inside. Further, according to the present invention, it is possible to prevent the position of the heat insulating layer 110 from moving inside the case member 100. Therefore, it is possible to prevent problems such as deterioration of the heat insulating effect of a predetermined portion of the casing member 100 due to movement of the heat insulating layer 110, deformation of the casing member 100, and the like.

Furthermore, each of the unit spaces for disposing and holding the heat insulating layer 110 at a predetermined distance may be divided by the partition W. At this time, the partition W may be made of a material different from the heat insulating material accommodated in the space therebetween. Particularly, the barrier rib W included in the heat insulating layer 110 may be made of a material having mechanical rigidity or shape retention rather than adiabatic characteristics. For example, the heat insulating layer 110 includes a plurality of heat insulating unit layers made of a glass wool material. The partition W separating the heat insulating unit layers may be formed of a material constituting the external insulating layer 140, Such as stretched nylon material.

Further, the barrier ribs can stably maintain the laminated structure of the casing member 100 even when the insulating member 110 does not adhere to the heat insulating material. For example, when the heat insulating layer 110 is provided between the metal layer 130 and the external insulating layer 140 as glass wool, the barrier ribs located in the heat insulating layer 110 are formed between the metal layer 130 and the external insulating layer 140 So that the insulating layer 110 prevents the structure between the metal layer 130 and the external insulating layer 140 from being separated.

Another example in which a plurality of unit layers arranged at a predetermined distance apart in the horizontal direction are included in the casing material 100 may include the structure shown in FIG. In the configuration of Fig. 5, a plurality of air layers in the heat insulating layer 110 are collected in a space defined by the partition walls.

In the above embodiments, the heat insulating layer 110 is disposed inside the casing 100, that is, between the internal adhesive layer 120 and the external insulating layer 140. However, The present invention is not limited thereto.

FIG. 9 is a perspective view schematically showing the configuration of a casing 100 of a secondary battery according to another embodiment of the present invention.

Referring to FIG. 9, the heat insulating layer 110 may be located on the outermost side of the covering member 100. For example, when the case 100 of the secondary battery is composed of the upper pouch T and the lower pouch B, the heat insulating layer 110 is formed on both the upper surface of the upper pouch T and the lower surface of the lower pouch B. .

Here, the heat insulating layer 110 may be detachably attachable to the case 100. For example, the heat insulating layer 110 provided on the upper surface side of the upper pouch T may be attached to the upper surface of the upper pouch T by moving downward from the upper portion of the upper pouch T. The heat insulating layer 110 provided on the upper pouch T can be separated from the upper surface of the upper pouch T by moving upward. Likewise, the heat insulating layer 110 provided on the lower side of the lower pouch B can be attached to the lower surface of the lower pouch B by moving upward from the lower portion of the lower pouch B. The heat insulating layer 110 of the lower pouch B may also be detachable from the lower surface of the lower pouch B.

According to this embodiment of the present invention, when the heat insulating layer 110 is damaged or broken, replacement of only the heat insulating layer 110 can economically and easily repair the damage of the secondary battery. In this case, the secondary battery can be kept warm.

In addition, since the heat insulating layer 110 is provided at the outermost portion of the secondary battery, when the secondary battery is impacted, the heat insulating layer 110 primarily absorbs and alleviates such an impact, Or the metal layer 130 or the polymer layer such as the external insulating layer 140 or the internal adhesive layer 120 can be prevented from being damaged or damaged from impact.

The insulating layer 110 prevents foreign matter such as moisture from flowing into the external insulating layer 140 or the metal layer 130 or the like to prevent the performance of the secondary battery from deteriorating or causing a problem in safety .

In addition, according to this embodiment, it is possible to adjust the internal temperature of the secondary battery by attaching / detaching the heat insulating layer 110 or changing it to another heat insulating material. For example, if the insulating layer 110 is not provided outside the secondary battery, and the internal temperature of the secondary battery is low, the insulating layer 110 is adhered to increase the internal temperature of the secondary battery. Alternatively, when the internal temperature of the secondary battery is low, the internal temperature of the secondary battery may be increased by replacing the insulating layer 110 with a material having a higher thermal insulation property.

9, at least a part of the heat insulating layer 110 is formed in a concave shape, and the concave portion is fitted into a portion protruding outwardly convexly for accommodating the electrode assembly in the case member Lt; / RTI > According to this configuration of the present invention, the attachment and detachment of the heat insulating layer in the exterior material can be more easily configured.

In addition, the heat insulating layer 110 may be configured to cover part or all of the external insulating layer.

Although the pouch type secondary battery, that is, the secondary battery includes the pouch type outer casing 100 in the above embodiments, the present invention is not necessarily limited thereto.

That is, the secondary battery according to another embodiment of the present invention is a can-type secondary battery and can include the can-type sheathing member 100. In this case, the facer material 100 may be composed of only the metal layer 130 and the heat insulating layer 110.

The battery pack according to the present invention may include the secondary battery according to the present invention as described above. In particular, a plurality of secondary batteries may be included in the battery pack. At this time, the battery pack includes a cartridge used for stacking the secondary battery, a pack case for accommodating the secondary battery and the cartridge, an electric device for controlling and protecting the charge / discharge operation of the secondary battery such as a BMS (Battery Management System), a fuse, And / or a duct for allowing the cooling fluid to flow in and out of the battery pack.

The secondary battery according to the present invention can be applied to an automobile such as an electric car or a hybrid car. That is, the automobile according to the present invention may include the secondary battery according to the present invention.

In addition, the secondary battery according to the present invention can be applied to a power storage device. That is, the power storage device according to the present invention may include a secondary battery according to the present invention. Such a power storage device can be applied to various fields and places for storing electric power such as a smart grid system for controlling power supply and demand and a charging station of an electric vehicle.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

In the present specification, terms indicating upward, downward, leftward, rightward, forward, and backward directions are used, but these terms are for convenience of explanation only and may vary depending on the position of an object or the position of an observer It will be apparent to those skilled in the art that the present invention is not limited thereto.

100: Outer material
110: insulating layer
120: internal adhesive layer
130: metal layer
140: outer insulating layer
200: electrode assembly
210: positive electrode tab
220: cathode tab

Claims (18)

A positive electrode plate on which a positive electrode current collector is coated with a positive electrode active material;
A negative electrode plate coated with a negative electrode active material on the negative electrode collector and arranged to face the positive electrode plate;
An electrolyte interposed between the positive electrode plate and the negative electrode plate; And
And a heat insulating layer for accommodating the positive electrode plate, the negative electrode plate and the electrolyte in an inner space and blocking the movement of heat between the inside and the outside,
Lt; / RTI >
Wherein the inner packaging layer comprises a metal layer, an outer insulation layer, and an inner adhesive layer, and the inner adhesive layer is adhered to a sealing portion provided at a rim of the inner space to seal the inner space,
Wherein the heat insulating layer comprises a foam having electric insulation property or a glass wool having electrical insulation, which is located between the external insulating layer and the internal adhesive layer. The method according to claim 1,
Wherein the electrolyte is a solid electrolyte.
delete The method according to claim 1,
Wherein the foam comprises at least one of EPS foam, XPS foam, polyethylene foam, polyurethane foam, water soft foam and urea foam. The method according to claim 1,
Wherein the heat insulating layer comprises a base layer.
delete The method according to claim 1,
Wherein the heat insulating layer includes a plurality of unit layers arranged at a predetermined distance in a horizontal direction.
delete delete The method according to claim 1,
Wherein the heat insulating layer includes a gas layer inside the metal layer. 11. The method of claim 10,
Wherein the heat insulating layer comprises a foam that is in contact with the metal layer.
delete delete The method according to claim 1,
Wherein the heat insulating layer is formed of a plurality of layers having different materials. A battery pack comprising the pouch type secondary battery according to any one of claims 1, 2, 4, 5, 7, 10, 11, An automobile comprising the pouch type secondary battery according to any one of claims 1, 2, 4, 5, 7, 10, 11, A power storage device comprising the pouch type secondary battery according to any one of claims 1, 2, 4, 5, 7, 10, 11, Wherein the electrode assembly and the electrolyte are housed in an inner space and are bonded to each other at a sealing portion provided at a rim of the inner space so that the inner space can be sealed. In the pouch type outer case for a pouch type secondary battery,
A metal layer made of a metal material;
An outer insulating layer formed of a polymer material and formed on the outer side of the metal layer;
An inner adhesive layer formed of a polymer material and formed on the inner side of the metal layer; And
A heat insulating layer disposed between the outer insulating layer and the inner adhesive layer and including a foam having electric insulation property or a glass wool having electrical insulation,
And a pouch-type outer casing for a pouch type secondary battery.

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