Energy storage device

Abstract

The present disclosure may provide an energy storage device including: a housing body including a housing portion including a layer structure provided with a housing space, and an internal passage allowing a fluid to pass therethrough; and a battery unit accommodated in the accommodation space, the battery unit being in thermal contact with the fluid passing through the internal passage.

Description

Technical Field

[0001] The present disclosure relates to an energy storage device. In addition, the present disclosure relates to an energy storage system (energy storage system) including the energy storage device. Background Art

[0002] In recent years, the demand for mobile devices such as smartphones, tablets, and wireless headphones has continued to increase. In addition, with the rapid and comprehensive development of electric vehicles, energy storage batteries, robots, and satellites, research on high-performance secondary batteries that can be repeatedly charged and discharged as energy sources is also being actively carried out.

[0003] At present, commercial secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries and lithium secondary batteries. Among them, lithium secondary batteries have almost no memory effect compared with nickel-based secondary batteries, so they have the advantages of free charge and discharge, extremely low self-discharge rate and high energy density.

[0004] An energy storage system (ESS) is a system that stores generated energy (eg, electricity) in a storage device and supplies the stored energy when needed.

[0005] For example, the energy storage device may store electricity. Generally speaking, the energy storage device may include more than one battery module to store electricity, and the battery module may be accommodated in a rack structure included in the energy storage device.

[0006] On the other hand, in recent years, in order to simplify the structure and reduce the number of components used, a cell-to-rack type energy storage device has emerged, in which the battery cell is directly accommodated in the rack structure, rather than the battery cell being manufactured into a battery module and then accommodated in the rack structure. However, this cell-to-rack type energy storage device has a problem in that it is difficult to manage the heat generated in the battery cell and is easily affected by vibration or external impact. Summary of the invention

[0007] 1. Technical issues to be resolved

[0008] An object of the present disclosure is to provide an energy storage device which can more easily manage heat generated in a battery cell and improve the problem of being easily affected by vibration or external impact.

[0009] An object of the present disclosure is to provide an energy storage device which, through a unique structure, enables a heat dissipation medium to more easily recover heat generated in a battery cell.

[0010] The purpose of the present disclosure is to provide an energy storage device that can accommodate more than one battery cell and continuously apply pressure to at least one side of the battery cell to extend the charge and discharge life of the battery cell, stabilize the cycle of the battery cell, and extend the life of the battery cell.

[0011] In addition, the present disclosure can be widely used in electric vehicles, battery charging stations, other green technology fields such as solar power generation and wind power generation using batteries, etc. In addition, the present disclosure can be used in eco-friendly electric vehicles and hybrid vehicles that prevent climate change by suppressing air pollution and greenhouse gas emissions.

[0012] (II) Technical solution

[0013] According to an example of the present disclosure, an energy storage device may include: a containing body including a containing portion and an internal channel, the containing portion including a layer structure provided with a containing space, the internal channel allowing fluid to pass through; and a battery cell contained in the containing space, the battery cell being in thermal contact with the fluid passing through the internal channel.

[0014] In an energy storage device according to an example of the present disclosure, the containing body may include one or more holes to connect the internal channel with the outside of the containing body.

[0015] In an energy storage device according to an example of the present disclosure, the containing body may include a fan at a position corresponding to the one or more holes, and the fan may move the fluid outside the containing body to the internal channel.

[0016] In an energy storage device according to an example of the present disclosure, the battery cell may include a terminal protruding on at least one side, and a side of the battery cell different from the side on which the terminal protrudes may be in thermal contact with the fluid passing through the internal channel.

[0017] In an energy storage device according to an example of the present disclosure, the battery cell may include a terminal protruding only on one side, and a side of the battery cell opposite to the side where the terminal protrudes may be in thermal contact with the fluid passing through the internal channel.

[0018] In an energy storage device according to an example of the present disclosure, the terminal may protrude toward the outside of the receiving body.

[0019] In an energy storage device according to one example of the present disclosure, the layer structure may include a resin layer on an inner wall where the accommodation space is provided.

[0020] In an energy storage device according to one example of the present disclosure, the layer structure may compress the battery cell accommodated in the accommodation space.

[0021] In an energy storage device according to an example of the present disclosure, the housing body may include a plurality of housing portions.

[0022] In an energy storage device according to an example of the present disclosure, the internal channel may be located between the plurality of accommodation portions.

[0023] The energy storage device according to an example of the present disclosure may further include: a front cover covering at least a portion of the one or more holes, and the front cover may include a fluid passing portion allowing fluid to pass through at a position corresponding to the one or more holes.

[0024] In an energy storage device according to an example of the present disclosure, the front cover may further include a spacer, and the spacer may be connected to the receiving body.

[0025] In an energy storage device according to an example of the present disclosure, the fluid passage portion may be spaced apart from the one or more holes.

[0026] In an energy storage device according to an example of the present disclosure, the housing body may include a heat conductive baffle, and the heat conductive baffle may be located between the housing portion and the internal channel.

[0027] In an energy storage device according to an example of the present disclosure, the battery cell may be in direct contact with the thermally conductive separator.

[0028] In an energy storage device according to an example of the present disclosure, the housing body may include steel.

[0029] An energy storage device according to an example of the present disclosure may be a cell to rack type energy storage device.

[0030] (III) Beneficial effects

[0031] The present disclosure may provide an energy storage device that more easily manages heat generated in a battery cell and improves the problem of being easily affected by vibration or external impact.

[0032] The present disclosure can provide an energy storage device which, through a unique structure, enables a heat dissipation medium to more easily recover heat generated in a battery cell.

[0033] The present disclosure may provide an energy storage device that can accommodate more than one battery cell and continuously apply pressure to at least one side of the battery cell to extend the charge and discharge life of the battery cell, stabilize the cycle of the battery cell, and extend the life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a diagram briefly showing the structure of an energy storage device according to one example of the present disclosure.

[0035] Figure 2 The structure of an energy storage device according to an example of the present disclosure is briefly shown. Figure 1 A diagram of a cross section taken along the XY plane.

[0036] Figure 3 The structure of an energy storage device according to an example of the present disclosure is briefly shown. Figure 1 A diagram of a cross section taken along the XY plane.

[0037] Figure 4 is a diagram briefly showing the structure of a battery cell according to one example of the present disclosure.

[0038] Figure 5 is a diagram briefly showing the structure of a battery cell according to one example of the present disclosure.

[0039] Figure 6 Briefly illustrating the structure of an energy storage device according to an example of the present disclosure, is a diagram showing a state in which a battery unit is inserted into a receiving space.

[0040] Figure 7 A partial structure of an energy storage device according to an example of the present disclosure is briefly shown, and is a diagram showing a state in which a battery unit is inserted into a receiving space.

[0041] Figure 8 A partial structure of an energy storage device according to an example of the present disclosure is briefly shown, and is a diagram showing a state in which a battery unit is inserted into a receiving space.

[0042] Fig. 9 is a diagram briefly showing the structure of an energy storage device according to one example of the present disclosure.

[0043] Fig.10 is a diagram briefly showing the structure of an energy storage device according to one example of the present disclosure.

[0044] Fig.11 The structure of an energy storage device according to an example of the present disclosure is briefly shown. Fig.10 A diagram of a cross section taken along the XY plane.

[0045] Fig.12 The structure of an energy storage device according to an example of the present disclosure is briefly shown. Fig.10 A diagram of a cross section taken along the XY plane.

[0046] Fig.13is a diagram briefly showing the structure of an energy storage device according to one example of the present disclosure.

[0047] Fig.14 is a diagram briefly showing the structure of an energy storage device according to one example of the present disclosure.

[0048] Description of Reference Numerals

[0049] 10: Energy storage device 100: accommodating body

[0050] 110: Accommodation portion 111: Layer structure

[0051] 112: Accommodation space 113: Resin layer

[0052] 121: Internal channel 122: Hole

[0053] 123: Fan 200: Battery unit

[0054] 210: External packaging material 220: Electrode assembly

[0055] 221: positive electrode 222: negative electrode

[0056] 223: Diaphragm 224: Insulation tape

[0057] 230: Cover 240: Terminal

[0058] 300: front cover 310: partition

[0059] 320: Fluid passing portion 400: Bus bar assembly

[0060] 500: Insulation layer 600: Side cover

[0061] C: Fluid DETAILED DESCRIPTION

[0062] The structural or functional descriptions of the embodiments disclosed in the present disclosure are merely exemplified for describing the embodiments according to the technical ideas of the present disclosure. In addition, the embodiments according to the technical ideas of the present disclosure can be implemented in various forms other than the embodiments disclosed in the present disclosure. In addition, the technical ideas of the present disclosure should not be interpreted as being limited to the embodiments described in the present disclosure.

[0063] Among the physical properties mentioned in the present disclosure, in the case where the measurement temperature affects the physical properties, unless otherwise specified, the physical properties are physical properties measured at normal temperature and pressure.

[0064] The term normal temperature used in the present disclosure is a natural temperature without heating or cooling, for example, a temperature in the range of 10° C. to 30° C., for example, a temperature above about 15° C., above about 18° C., above about 20° C., above about 23° C., below about 27° C., or 25° C. In the present disclosure, unless otherwise specified, the unit of temperature is Celsius (° C.).

[0065] Among the physical properties mentioned in the present disclosure, in the case where the measuring pressure affects the physical property, the physical property is a physical property measured under normal pressure unless otherwise specified.

[0066] The term normal pressure used in the present disclosure refers to natural pressure without pressurization or decompression, and generally, the gas pressure within the range of about 700 mmHg to 800 mmHg is referred to as normal pressure.

[0067] The term a to b used in the present disclosure refers to a range between and including a and b. For example, comprising a to b in parts by weight has the same meaning as being within the range of a to b in parts by weight.

[0068] Unless otherwise specified, the terms height (or depth), width and amplitude used in the present disclosure refer to average values ​​and can be measured in a manner in the art by measuring instruments capable of measuring height (or depth), width and amplitude, respectively.

[0069] The present disclosure can provide an energy storage device 10 that can more easily manage the heat generated in the battery cell 200 and improve the problem of being easily affected by vibration or external impact (refer to Figure 1 and Figure 6 The present disclosure can provide an energy storage device 10, which can use a unique structure to enable the heat dissipation medium to more easily recover the heat generated in the battery cell 200 (refer to Figure 3 ). The present disclosure may provide an energy storage device 10, which may accommodate more than one battery cell 200 and may continuously apply pressure to at least one side of the battery cell 200 to extend the charge and discharge life of the battery cell, stabilize the cycle of the battery cell, and extend the life of the battery cell (refer to Figure 8 ). In addition, the energy storage device 10 according to an example of the present disclosure may be an energy storage device 10 in the form of a cell to rack.

[0070] Figure 1 is a diagram briefly showing the structure of an energy storage device 10 according to an example of the present disclosure. In addition, Figure 2 and Figure 3 The structure of the energy storage device 10 according to an example of the present disclosure is briefly shown. Figure 1 A diagram of a cross section taken along the XY plane.

[0071] The energy storage device 10 according to an example of the present disclosure may include a housing body 100. The housing body 100 may include a housing space 112, and a battery cell 200 may be housed in the housing space 112. In addition, the energy storage device 10 may include a battery cell 200 housed in the housing space 112.

[0072] In the energy storage device 10 according to one example of the present disclosure, the receiving portion 110 may include a layer structure 111 provided with the receiving space 112. In addition, the receiving body 100 may include an internal channel 121 allowing the fluid C to pass therethrough.

[0073] In the energy storage device 10 according to an example of the present disclosure, the housing body 100 may include steel. Specifically, the housing body 100 may be manufactured by connecting steel frames to each other. When the housing body 100 includes steel, even if the battery cell 200 is inserted into the housing space 112, the problem of being easily affected by vibration or external impact may be improved.

[0074] In the energy storage device 10 according to one example of the present disclosure, the battery cell 200 may be in thermal contact with the fluid C passing through the internal channel 121 .

[0075] The term thermal contact used in the present disclosure may refer to a state in which two objects are in direct or indirect contact to transfer heat between each other. Here, the transfer of heat may refer to conduction and / or convection. In addition, the state of direct contact may refer to a state in which two objects are in direct physical contact with each other at least in a portion of the area. In addition, the state of indirect contact may refer to a state in which a heat medium substance is located between two objects and heat is transferred through the heat medium substance. In addition, the convection may refer to forced convection of the fluid C.

[0076] Specifically, heat generated in the battery cell 200 accommodated in the accommodation space 112 may be transferred by forced convection of the fluid C passing through the internal channel 121. In this case, it may be referred to as thermal contact in a direct contact state.

[0077] In addition, in another example, the battery cell 200 may be in contact with a heat medium substance disposed in a portion of the accommodation space 112, and the heat generated in the battery cell 200 may be transferred to the heat medium substance by conduction, and the heat medium substance receiving the heat may be transferred by forced convection of the fluid C passing through the internal channel 121. In this case, it may be referred to as thermal contact in an indirect contact state.

[0078] That is, in the energy storage device 10 according to one example of the present disclosure, the battery cell 200 may be in thermal contact with the fluid C passing through the internal channel 121 , and the fluid C may dissipate heat generated in the battery cell 200 through forced convection.

[0079] The term fluid C used in the present disclosure may refer to a substance in a liquid state, a material in a gaseous state, and a combination thereof under normal temperature and pressure conditions. For example, the fluid may include a liquid state material, a gaseous state material, and a combination thereof that is easily available and capable of absorbing and recovering the heat generated in the battery cell 200, and may be water, air, or a combination thereof. The type of the fluid is not particularly limited as long as it can absorb the heat generated when the battery cell 200 is working.

[0080] In an energy storage device 10 according to an example of the present disclosure, the fluid may be a substance in a gaseous state under normal temperature and pressure conditions, for example, the substance in a gaseous state may be air.

[0081] On the other hand, the fluid C may be a heat dissipation medium or a heat exchange medium, and may recover heat generated in the battery cell 200 by being in thermal contact with the battery cell 200 .

[0082] Reference Figure 1 According to an example of the present disclosure, an energy storage device 10 may include a housing 110, wherein the housing 110 includes more than one layer structure 111. In the energy storage device 10, the housing 110 may include multiple layer structures 111, and the multiple layer structures 111 are not particularly limited and may have the following structures: Figure 1 The shown are connected to each other and stacked to form a lattice-like cross-section.

[0083] Reference Figure 1 In an energy storage device 10 according to an example of the present disclosure, the layer structure 111 may include more than one accommodating space 112. The size of the accommodating space 112 may be determined according to the size of the battery cell 200. The amplitude and width of the accommodating space 112 may be respectively greater than the amplitude and width of the battery cell 200. However, the amplitude difference and width difference between the accommodating space 112 and the battery cell 200 may be designed to be smaller, so that the battery cell 200 can be easily inserted into the accommodating space 112 and not easily detached from the accommodating space 112. In addition, the depth of the accommodating space 112 may be determined according to the height of the battery cell 200, and may be designed so that the battery cell 200 can be in thermal contact with the fluid C flowing in the internal channel 121.

[0084] In an energy storage device 10 according to an example of the present disclosure, the receiving body 100 may include a plurality of layer structures 111. In addition, each of the layer structures 111 may independently include more than one receiving space 112, and preferably, may include a plurality of receiving spaces 112.

[0085] Reference Figure 1 In an energy storage device 10 according to an example of the present disclosure, a receiving body 100 includes a plurality of layer structures 111 , and the layer structures 111 are provided with a plurality of receiving spaces 112 .

[0086] In an energy storage device 10 according to an example of the present disclosure, the housing body 100 may include a partition for forming a plurality of housing spaces 112 and separating each housing space 112. The number of housing spaces 112 in the layer structure 111 may be determined according to the number of the partitions. Figure 1 If there are k partitions, then there may be k+1 accommodating spaces 112 (k is a positive number).

[0087] In the energy storage device 10 according to an example of the present disclosure, the shape of the accommodation space 112 can be designed in consideration of the shape of the battery unit 200. Figure 1 In order to introduce the prismatic battery cell 200 into the accommodation space 112, considering that the battery cell 200 is prismatic in shape, the accommodation space 112 may have a hexahedral intaglio shape.

[0088] Reference Figure 1 and Figure 2 Considering that the shape of the battery cell 200 is a prismatic shape, the accommodating space 112 has a hexahedral engraved shape. However, even in the case where the shape of the battery cell 200 is cylindrical or pouch-shaped instead of prismatic, the design can be performed taking the shape of the battery cell 200 into consideration.

[0089] In an energy storage device 10 according to an example of the present disclosure, the containing body 100 may include one or more holes 122 to connect the internal channel 121 with the outside of the containing body 100 .

[0090] Reference Figure 1 In an energy storage device 10 according to an example of the present disclosure, the containing body 100 includes a hole 122 connecting an internal channel 121 with the outside of the containing body 100 , and a plurality of the holes 122 may be provided on one surface of the containing body 100 .

[0091] In the energy storage device 10 according to an example of the present disclosure, the housing body 100 includes one or more holes 122 so that the fluid C capable of dissipating the heat generated in the battery cell 200 can flow into the internal channel 121. That is, the fluid C outside the housing body 100 can effectively dissipate the heat generated in the battery cell 200 when passing through the internal channel 121.

[0092] Reference Figure 2 and Figure 3 The energy storage device 10 may include an internal channel 121 . The fluid C outside the housing body 100 may flow into the internal channel 121 through the hole 122 .

[0093] In the energy storage device 10 according to an example of the present disclosure, the number of holes 122 can be determined according to the number of layer structures 111. The number of holes 122 can be less than, greater than, or equal to the number of layer structures 111. Preferably, in order to more easily discharge the heat generated in the battery cell 200, the number of holes 122 can be greater than or equal to the number of layer structures 111. Figure 1 In the energy storage device 10 , the number of holes 122 may be equal to the number of layer structures 111 .

[0094] In the energy storage device 10 according to one example of the present disclosure, the hole 122 may be provided at a position considering the height of each layer structure 111. In addition, when a plurality of holes 122 are provided, each hole 122 may be provided at a position considering the height of each layer structure 111.

[0095] In the energy storage device 10 according to an example of the present disclosure, the housing body 100 may include a hole 122 corresponding to a specific layer structure 111. Figure 1 , the hole 122 corresponding to a specific one of the layer structures 111 may be located at a position that is about 1 / 2 of the height of the layer structure 111 away from the bottom of the specific one of the layer structures 111 .

[0096] If the position of the hole 122 is designed in consideration of the height of each layer structure 111 as described above, heat dissipation of the battery cell 200 accommodated in the accommodation space 112 can be made easier. Figure 1 Although one hole 122 corresponding to each layer structure 111 is provided in the containing body 100 , a plurality of holes 122 may also be provided.

[0097] In the energy storage device 10 according to an example of the present disclosure, the housing body 100 may further include a fan 123 at a position corresponding to the hole 122. The position corresponding to the hole 122 may refer to a position at least partially facing the hole 122 provided in the housing body 100. Figure 1 , each fan 123 is disposed to face each hole 122 .

[0098] In the energy storage device 10 according to an example of the present disclosure, the fan 123 can move the fluid C outside the housing body 100 to the internal channel 121. Specifically, the fan 123 can include more than one blade, and can move the fluid C outside the housing body 100 to the internal channel 121 through the rotation of the blades. That is, the fan 123 can forcibly move the fluid C outside the housing body 100 to the internal channel 121.

[0099] On the other hand, the fan 123 may receive external power through a power supply device to rotate the blades, and forcibly move the fluid C to the internal channel 121 through the rotation of the blades.

[0100] In addition, the fan 123 continuously moves the fluid C outside the accommodating body 100 to the internal channel 121 , so that the fluid C existing in the internal channel 121 is forcibly moved to other spaces.

[0101] Through such a process, the fluid C that absorbs the heat generated in the battery cell 200 is mixed or exchanged with the relatively low temperature fluid C outside the housing body 100, so that the heat generated in the battery cell 200 can be more easily recovered. In addition, through the process as described above, the heat generated in the battery cell 200 can be dissipated by forced convection.

[0102] In the energy storage device 10 according to an example of the present disclosure, the housing body 100 may include a plurality of housing portions 110. Figure 1 The receiving body 100 includes two receiving parts 110, each of which may include a plurality of layer structures 111. In addition, each of the layer structures 111 may include a plurality of receiving spaces 112. Figure 2 The receiving body 100 includes two receiving portions 110 , and each of the receiving portions 110 may face each other. Figures 1 to 3 An example is shown in which the receiving body 100 includes two receiving portions 110 , but those skilled in the art may easily understand that the receiving body 100 may include more receiving portions 110 .

[0103] In the energy storage device 10 according to one example of the present disclosure, the receiving body 100 includes a plurality of receiving portions 110, and the internal channel 121 may be located between the plurality of receiving portions 110. If the internal channel 121 is located between the plurality of receiving portions 110 as described above, it may be advantageous to more easily dissipate the heat generated in the battery cell 200. Figure 1 , Figure 2 and Figure 3 , an internal passage 121 through which the fluid C can pass may be located between two accommodation portions 110 facing each other.

[0104] On the other hand, in the energy storage device 10 according to an example of the present disclosure, at least a portion of the receiving portion 110 may be in communication with the internal channel 121. Specifically, the receiving space 112 of the receiving portion 110 may be in communication with the internal channel 121. Since the receiving space 112 is in communication with the internal channel 121, the battery cell 200 received in the receiving space 112 may be in thermal contact with the fluid C passing through the internal channel 121. Specifically, the thermal contact may refer to a state of direct thermal contact.

[0105] The energy storage device 10 according to an example of the present disclosure may include a heat conductive baffle 130 (see Fig.12 ), the thermally conductive baffle 130 is located between at least a portion of the receiving portion 110 and the internal channel 121. The thermally conductive baffle 130 may include a metal or resin with high thermal conductivity, preferably, may include a metal. In addition, the battery cell 200 inserted into the receiving space 112 may be indirectly thermally contacted with the fluid C passing through the internal channel 121 through the thermally conductive baffle 130.

[0106] Figure 4 and Figure 5 2 is a diagram briefly showing the structure of a battery cell 200 according to an example of the present disclosure. Figure 4 In the energy storage device 10 according to one example of the present disclosure, the battery cell 200 may include an external packaging material 210. In addition, the battery cell 200 may include an electrode assembly 220, and the electrode assembly 220 may be built in an internal space formed by the external packaging material 210.

[0107] In addition, the electrode assembly 220 may include one or more joints 221a, 221b protruding from at least a portion of the surface. The joints 221a, 221b may be formed only on a specific surface of the electrode assembly 220, in which case the joints 221a, 221b may be referred to as unidirectional joints 221a, 221b. In addition, the joints 221a, 221b may be formed on multiple surfaces of the electrode assembly 220, in which case the joints may be referred to as multidirectional joints, and in particular, when the joints are formed on two surfaces of the electrode assembly 220, the joints may be referred to as bidirectional joints. Figure 5 Preferably, the battery unit 200 may have one-way connectors 221a, 221b.

[0108] In the energy storage device 10 according to an example of the present disclosure, the battery cell 200 may include an outer packaging material 210, and the outer packaging material 210 may have various shapes. According to the shape of the outer packaging material 210, the battery cell 200 may be classified into a cylindrical shape, a prismatic shape, or a pouch shape. Figure 4 and Figure 5 , the battery cell 200 according to one example of the present disclosure may be a prismatic battery cell 200 .

[0109] Reference Figure 4 and Figure 5 In the prismatic battery cell 200, the outer packaging material 210 may have a hexahedral structure with one side open so that the electrode assembly 220 can be built into the outer packaging material 210. Specifically, the open side may be determined according to the directions of the joints 221a, 221b of the electrode assembly 220. However, in the present disclosure, the battery cell 200 described in the drawings is described by taking the prismatic battery cell 200 as an example, but the battery cell 200 may be a cylindrical or pouch-shaped battery cell.

[0110] In the battery cell 200 of the energy storage device 10 according to an example of the present disclosure, the outer packaging material 210 may include an aluminum (Al) material. If the outer packaging material 210 includes an aluminum material, sufficient rigidity can be ensured to protect the electrode assembly 220 from external impact or vibration, and it can be beneficial to the weight reduction of the energy storage device 10.

[0111] In the battery cell 200 of the energy storage device 10 according to an example of the present disclosure, the outer material 210 may be provided with an internal space so that the electrode assembly 220 can be built into the internal space. As described above, the electrode assembly 220 may be built into the internal space. In addition, an electrolyte may be included in the internal space. The electrolyte may be liquid or solid at room temperature, preferably, liquid at room temperature. If the electrolyte is liquid at room temperature, it may be referred to as an electrolyte.

[0112] Reference Figure 4 In the battery cell 200 of the energy storage device 10 according to an example of the present disclosure, the electrode assembly 220 may include electrodes 221, 222 and a separator 223. The electrodes 221, 222 may include a positive electrode 221 and a negative electrode 222. Specifically, the electrode assembly may include a positive electrode 221, a negative electrode 222 and a separator 223. In addition, in the electrode assembly 220, the separator 223 may be interposed between the positive electrode 221 and the negative electrode 222.

[0113] In the battery cell 200 of the energy storage device 10 according to one example of the present disclosure, the electrode assembly 220 is also referred to as a jelly roll. The electrode assembly 220 can be manufactured by winding a positive electrode 221, a negative electrode 222, and a separator 223 in the form of a sheet elongated in a vertical direction. In another example, the electrode assembly 220 can be manufactured by a folding method (e.g., a Z-folding method) in which the positive electrode 221 and the negative electrode 222 cut to an appropriate size are inserted between the separator 223 in the form of a sheet elongated in the vertical direction.

[0114] In the battery cell 200 of the energy storage device 10 according to an example of the present disclosure, the positive electrode 221 of the electrode assembly 220 refers to a reduction electrode where the electron transfer material receives electrons when the battery cell 200 is discharged. The electron transfer material may be, for example, lithium ions (Li + ). In addition, the negative electrode (anode) 222 of the electrode assembly 220 refers to an oxidation electrode where an electron transfer material transfers electrons when the battery cell 200 is discharged. The electron transfer material may be, for example, lithium ions (Li+). The positive electrode 221 and the negative electrode 222 may each independently include a collector and an active material layer formed on the collector, the collector may include a metal material, and the active material layer may include an active material. In addition, the positive electrode 221 may include a collector including, for example, aluminum, and the negative electrode 222 may include a collector including, for example, copper.

[0115] In the battery cell 200 of the energy storage device 10 according to an example of the present disclosure, the separator 223 of the electrode assembly 220 refers to a membrane that prevents electrical short circuit between the positive electrode 221 and the negative electrode 222 and allows electron transfer substances to pass through. The electron transfer substance may be, for example, lithium ions (Li + The separator 223 is not particularly limited as long as it is used in the art. Preferably, the separator 223 has a low ion transfer resistance of the electrolyte and excellent wettability (wettability) of the electrolyte.

[0116] Reference Figure 4In the battery cell 200 of the energy storage device 10 according to an example of the present disclosure, one side of the electrode assembly 220 may include a positive electrode connector 221a and a negative electrode connector 221b. The positive electrode connector 221a may extend from the positive electrode 221 and have a structure protruding on one side of the electrode assembly 220. In addition, the negative electrode connector 221b may extend from the negative electrode 222 and have a structure protruding on one side of the electrode assembly 220. In addition, the positive electrode connector 221a and the negative electrode connector 221b of the electrode assembly 220 may be made of a metal material, the positive electrode connector 221a may be made of the same material as the collector of the positive electrode 221, and the negative electrode connector 221b may be made of the same material as the collector of the negative electrode 222. In addition, insulating tapes 224 may be independently attached to the positive electrode connector 221a and the negative electrode connector 221b, respectively. The insulating tape 224 has electrical insulation and may surround the outer side of each of the positive electrode tab 221a and the negative electrode tab 221b. Figure 4 The insulating tape 224 is attached to the positive electrode terminal 221a and the negative electrode terminal 221b, but this is attached as needed, and the insulating tape 224 may not be attached to the terminals 221a and 221b.

[0117] In the battery cell 200 of the energy storage device 10 according to an example of the present disclosure, the electrolyte may refer to a medium that allows electron transfer substances to move so that the electrochemical reaction between the positive electrode 221 and the negative electrode 222 proceeds smoothly. The electron transfer substance may be, for example, lithium ions (Li + ). In addition, the electrolyte may be solid at room temperature, in which case the solid electrolyte may be interposed between the positive electrode 221 and the negative electrode 222 in the form of a layer and simultaneously used as a separator 223, and the battery cell 200 at this time may be referred to as an all-solid battery. The solid electrolyte may include electrolytes used in the art without limitation. In addition, as described above, the electrolyte may be an electrolyte that is liquid at room temperature. The liquid electrolyte may include electrolytes used in the art without limitation, and may generally include an organic solvent and a lithium salt.

[0118] The battery cell 200 of the energy storage device 10 according to an example of the present disclosure may include a cover 230 capable of sealing the open face of the outer packaging material 210. The cover 230 may be connected to the outer packaging material 210, specifically, it may be connected by welding. Like the outer packaging material 210, the cover 230 may include a metal material. In addition, the cover 230 may further include an injection port to inject an electrolyte into the internal space of the outer packaging material 210.

[0119] In addition, refer to Figure 5, the battery cell 200 may include a terminal 240 protruding on at least one side. The terminal 240 may be provided on the cover 230, and may protrude in one direction of the battery cell 200 while protruding into the inner space of the outer packaging material 210. Here, the terminal 240 protruding into the inner space of the outer packaging material 210 may be welded to the joints 221a, 221b, whereby the terminal 240 and the joints 221a, 221b may be electrically connected.

[0120] The term "electrical connection" used in the present disclosure may refer to a state in which a circuit is formed when connection objects are connected by a connection device and current can flow through each of the connection objects. The connection device is not particularly limited as long as it can be electrically connected, and may be a direct contact between the connection objects or a wire through which current can flow, etc.

[0121] In the energy storage device 10 according to an example of the present disclosure, preferably, the battery cell 200 includes a one-way terminal 240 to maximize the structure and heat dissipation effect of the housing body 100. That is, the terminal 240 of the battery cell 200 may protrude only on one side of the battery cell 200.

[0122] The energy storage device 10 according to an example of the present disclosure may include more than one battery cell 200. In the energy storage device 10, the battery cell 200 may be inserted into at least a portion of the accommodation space 112 provided in the accommodation portion 110.

[0123] Preferably, the energy storage device 10 according to an example of the present disclosure may include a battery cell 200 according to the number of the accommodation spaces 112 provided in the accommodation portion 110. In addition, if there are multiple accommodation spaces 112, the energy storage device 10 may include multiple battery cells 200, and the battery cells 200 may be inserted into each of the accommodation spaces 112, respectively.

[0124] Figure 6 Briefly illustrating the structure of the energy storage device 10 according to one example of the present disclosure, is a diagram showing a state in which the battery unit 200 is inserted into the accommodation space 112 .

[0125] Reference Figure 6 In an energy storage device 10 according to an example of the present disclosure, the battery cell 200 may include a terminal 240 protruding on at least one side. In addition, the battery cell 200 may include a terminal 240 protruding on only one side. Preferably, the battery cell 200 includes a unidirectional terminal 240 in which the terminal 240 protrudes on only one side.

[0126] In the energy storage device 10 according to one example of the present disclosure, a surface of the battery cell 200 different from the surface from which the terminal 240 protrudes may be in thermal contact with the fluid C passing through the internal channel 121. That is, another surface of the battery cell 200 other than the surface from which the terminal 240 protrudes may be disposed in a direction toward the internal channel 121, and the other surface may be in thermal contact with the fluid C passing through the internal channel 121.

[0127] In an energy storage device 10 according to an example of the present disclosure, the battery cell 200 includes a terminal 240 protruding only on one side as described above, and the surface of the battery cell 200 opposite to the protruding surface of the terminal 240 can be in thermal contact with the fluid passing through the internal channel 121 .

[0128] In the energy storage device 10 according to one example of the present disclosure, the terminal 240 of the battery cell 200 may protrude toward the outside of the receiving body 100. Figure 6 , the battery cell 200 may be inserted into the receiving space 112 such that the terminal 240 protrudes toward the outside of the receiving body 100 .

[0129] Reference Figure 6 As described above, the terminal 240 of the battery cell 200 may protrude toward the outside of the housing body 100. In addition, the terminal 240 of the battery cell 200 may protrude toward a direction opposite to the internal channel 121. That is, the battery cell 200 may be inserted into the housing space 112 so that the surface of the battery cell 200 opposite to the surface from which the terminal 240 protrudes is in thermal contact with the fluid C passing through the internal channel 121.

[0130] As described above, when the surface of the battery cell 200 opposite to the surface from which the terminal 240 protrudes is in thermal contact with the fluid C passing through the internal channel 121, it is easier to manage the heat generated in the battery cell 200. In particular, since the fluid C passing through by the forced convection becomes a heat dissipation medium, it is easier to manage the heat generated in the battery cell 200 included in the energy storage device 10.

[0131] Figure 7 and Figure 8 The partial structure of the energy storage device 10 according to an example of the present disclosure is briefly shown, and is a diagram showing a state where the battery unit 200 is inserted into the accommodation space 112. Specifically, Figure 7 and Figure 8 The structure of one receiving space 112 in the layer structure 111 is shown.

[0132] In the energy storage device 10 according to one example of the present disclosure, the layer structure 111 may include a resin layer 113 disposed on the inner wall of the accommodation space 112. Figure 7The battery cell 200 is inserted into the receiving space 112 so that the terminal 240 protrudes toward the outside of the receiving body 100. Here, the inner wall provided with the receiving space 112 may include a resin layer 113, and the resin layer 113 may be located in at least a portion of the inner wall, preferably, in all areas of the inner wall except for one side facing the internal channel 121.

[0133] In the energy storage device 10 according to an example of the present disclosure, the thickness of the resin layer 113 may be determined according to the size of the battery cell 200 to be inserted into the accommodation space 112. The resin layer 113 may have a thickness such that the battery cell 200 to be inserted into the accommodation space 112 is not easily detached from the accommodation space 112 after being inserted into the accommodation space 112.

[0134] In the energy storage device 10 according to an example of the present disclosure, the resin layer 113 may include a hygroscopic material. The hygroscopic material may include one or more selected from the group consisting of polyethylene (PE), polypropylene (PP), polyvinylidene fluoride (PVDF) or its derivatives, and polyurethane (PU).

[0135] On the other hand, when the battery cell 200 is repeatedly charged and discharged, a swelling phenomenon may occur, which may cause problems such as electrolyte leakage or fire. In the energy storage device 10 according to an example of the present disclosure, the resin layer 113 is set to fit the size of the battery cell 200 and contains a hygroscopic material, so that the above problems can be prevented.

[0136] In the energy storage device 10 according to one example of the present disclosure, the layer structure 111 includes a resin layer 113 on the inner wall where the accommodation space 112 is provided, so that the layer structure 111 can press the battery cell 200 accommodated in the accommodation space 112. Figure 8 , the battery cell 200 accommodated in the accommodation space 112 may be pressed by the resin layer 113. After the battery cell 200 is accommodated in the accommodation space 112, the pressure applied to the battery cell 200 may be constantly and continuously applied.

[0137] In the energy storage device 10 according to an example of the present disclosure, since the battery cell 200 built into the accommodation space 112 is pressed by the resin layer 113, it is possible to extend the charge and discharge life of the battery cell 200, stabilize the cycle of the battery cell 200, and extend the life of the battery cell 200. In addition, even if the battery cell 200 is directly inserted into the accommodation space 112 without a separate additional housing process, the problem of being easily affected by vibration or external impact can be improved by the resin layer 113.

[0138] In the energy storage device 10 according to one example of the present disclosure, at least a portion of the battery cell 200 may be in contact with the resin layer 113. Specifically, at least a portion of the other surfaces except the surface from which the terminal 240 of the battery cell 200 protrudes and the surface in thermal contact with the fluid C passing through the internal channel 121 may be in contact with the resin layer 113. In addition, at least a portion of the surface of the battery cell 200 in contact with the resin layer 113 may be squeezed by the resin layer 113. Preferably, all other surfaces except the surface from which the terminal 240 of the battery cell 200 protrudes and the surface in thermal contact with the fluid C passing through the internal channel 121 may be in contact with the resin layer 113, and the surface in contact with the resin layer 113 may be squeezed.

[0139] Fig. 9 and Fig.10 is a diagram briefly showing the structure of an energy storage device 10 according to an example of the present disclosure. In addition, Fig.11 and Fig.12 The structure of the energy storage device 10 according to an example of the present disclosure is briefly shown. Fig.10 A diagram of a cross section taken along the XY plane.

[0140] The energy storage device 10 according to an example of the present disclosure may include a front cover 300 covering at least one hole 122. Fig. 9 and Fig.10 The front cover 300 may be connected to the surface of the receiving body 100 where the hole 122 is formed by contacting at least a portion of the area. The front cover 300 and the receiving body 100 may be connected by welding or adhesive, for example. On the other hand, the front cover 300 may include metal.

[0141] In the energy storage device 10 according to an example of the present disclosure, the front cover 300 may include a fluid passing portion 320 that allows the fluid C to pass through at a position corresponding to the hole 122. The fluid passing portion 320 may have a mesh-like structure to allow the fluid C to pass through, and the mesh-like structure may be formed with dense holes to prevent external foreign matter from entering the fan 123. The fluid passing portion 320 may include the same material as the front cover 300. In addition, the housing body may include a fan at a position corresponding to one or more holes.

[0142] In the energy storage device 10 according to one example of the present disclosure, the fluid C may pass through the fluid passing portion 320 by the operation of the fan 123 , and the fluid C entering through the fluid passing portion 320 may enter the internal channel 121 again by the continuous operation of the fan 123 .

[0143] In addition, the position corresponding to the hole 122 may refer to a position facing the hole 122. Fig. 9 and Fig.10 , the fluid passing portion 320 may be disposed to face the hole 122. That is, a portion of the front cover 300 includes the fluid passing portion 320 that allows the fluid C to pass therethrough, and further, the fluid passing portion 320 may be located facing the hole 122 formed in the receiving body 100.

[0144] In the energy storage device 10 according to one example of the present disclosure, the fluid passing portion 320 may be spaced apart from the hole 122. Fig. 9 and Fig.10 , the fluid passing portion 320 may be spaced apart from the hole 122. In addition, the fluid passing portion 320 may be disposed to face the hole 122 and to be spaced apart from the hole 122.

[0145] In addition, in the energy storage device 10 according to one example of the present disclosure, the fluid passage portion 320 may be disposed to face all holes 122 formed on one side of the housing body 100. In addition, the fluid passage portion 320 may be spaced apart from all holes 122 formed on one side of the housing body 100.

[0146] In addition, the front cover 300 may include a fluid passing portion 320 that allows the fluid C to pass through at a position corresponding to the fan 123. The position corresponding to the fan 123 may refer to a position facing the fan 123. Fig. 9 and Fig.10Specifically, the fluid passing portion 320 may be disposed to face the fan 123. That is, a portion of the front cover 300 includes the fluid passing portion 320, which allows the fluid C to pass therethrough, and the fluid passing portion 320 may be located facing the fan 123.

[0147] In the energy storage device 10 according to one example of the present disclosure, the fluid passage portion 320 may be spaced apart from the fan 123. Fig. 9 and Fig.10 , the fluid passing portion 320 may be spaced apart from the fan 123. In addition, the fluid passing portion 320 may be disposed to face the fan 123 and to be spaced apart from the fan 123.

[0148] In addition, in the energy storage device 10 according to an example of the present disclosure, the fluid passage portion 320 may be disposed to face all fans 123 disposed on one side of the housing body 100. In addition, the fluid passage portion 320 may be spaced apart from all fans 123 disposed on one side of the housing body 100.

[0149] In the energy storage device 10 according to an example of the present disclosure, the front cover 300 may further include a spacer 310. Fig. 9 and Fig.10 , the front cover 300 may be connected to the receiving body 100, and may include a spacer 310 that is directly in contact with and connected to the receiving body 100. The receiving body 100 and the spacer 310 may be connected by, for example, welding or an adhesive. On the other hand, the spacer 310 may include metal. The front cover 300 may be connected to the receiving body 100 through the spacer 310.

[0150] In the energy storage device 10 according to an example of the present disclosure, the area of ​​the front cover 300 other than the partition 310 may not be connected to the receiving body 100. The front cover 300 may include the partition 310 connected to the receiving body 100 and the fluid passing portion 320 spaced apart from the receiving body 100.

[0151] Reference Fig.11, the spacer 310 of the front cover 300 may be connected to the containing body 100, and the fluid passing portion 320 may not be connected to the containing body 100. In addition, the spacer 310 of the front cover 300 may be connected to the containing body 100, and the fluid passing portion 320 may be spaced apart from the containing body 100. In addition, the spacer 310 of the front cover 300 may be connected to the containing body 100, and the fluid passing portion 320 may face the containing body 100 and be spaced apart from the containing body 100. If the energy storage device 10 includes the front cover 300 having such a structure, it is possible to allow the fluid C to flow into the internal channel 121 while preventing the inflow of external foreign matter. In addition, by the front cover 300 having the above-mentioned structure, there is a spaced apart space between the front cover 300 and one side of the containing body 100, and the fluid C filled in the spaced apart space can dissipate the heat generated in the battery cell 200. That is, the fluid C passing through the front cover 300 can not only directly recover the heat generated in the battery cell 200 when passing through the internal channel 121, but also simultaneously recover the heat generated in the battery cell 200 conducted to the housing body 100 through the above-mentioned partitioned space. Therefore, the heat generated in the battery cell 200 can be more easily managed.

[0152] Reference Fig.12 , the containing body 100 may include a heat-conductive partition 130. The heat-conductive partition 130 may be located between the containing portion 110 and the internal channel 121. As described above, the heat-conductive partition 130 may include a metal or a resin having a high thermal conductivity, and preferably, may include a metal. In addition, the heat-conductive partition 130 and the battery cell 200 may be in direct contact, and the heat generated in the battery cell 200 may be conducted to the heat-conductive partition 130. The heat conducted to the heat-conductive partition 130 may be dissipated by the fluid C passing through the internal channel 121. The battery cell 200 inserted into the containing space 112 may be in indirect thermal contact with the fluid C passing through the internal channel 121 through the heat-conductive partition 130.

[0153] Fig.13 and Fig.14 1 is a diagram briefly showing the structure of an energy storage device 10 according to an example of the present disclosure. The energy storage device 10 according to an example of the present disclosure may include a busbar assembly 400, which includes more than one busbar structure. In addition, the energy storage device 10 may include an insulating layer. In addition, the energy storage device 10 may include a side cover 600 to protect the battery cell 200 inserted into the housing body 100 from external foreign matter.

[0154] Reference Fig.13, the energy storage device 10 according to an example of the present disclosure may include a bus bar assembly that can be electrically connected to the terminal 240 of the battery cell 200. Specifically, the bus bar assembly may include a bus bar structure, and the bus bar structure may be directly electrically connected to the terminal 240 of each battery cell 200. Here, direct connection may refer to connection by welding.

[0155] In addition, refer to Fig.13 According to an example of the present disclosure, the energy storage device 10 may include a side cover 600, which can cover at least a portion of the bus bar assembly 400. In addition, the energy storage device 10 may include an insulating layer 500 to increase safety by ensuring electrical insulation between the bus bar assembly 400 and the side cover 600. The insulating layer 500 is not particularly limited, as long as it is a material with electrical insulation in the art, and may include, for example, one or more selected from the group consisting of polyethylene, polypropylene, and polyvinylidene fluoride or derivatives thereof.

[0156] Reference Fig.14 In an energy storage device 10 according to an example of the present disclosure, at least one side of the housing body 100 is covered by the front cover 300 and the side cover 600 , thereby preventing external foreign matter from flowing into the housing portion 110 or the internal channel 121 in the housing body 100 .

[0157] An energy storage system according to an example of the present disclosure may include an energy storage device 10 according to an example of the present disclosure. In addition, the energy storage system may include more than one energy storage device 10. In addition, the energy storage system may include a control device that controls the state (e.g., temperature, storage capacity, or whether to operate) of the energy storage device 10 included, the external environment (temperature or humidity), and the supply and interruption of energy. In addition, the energy storage system may further include a configuration commonly used in the art.

Claims

1. An energy storage device, comprising: A receiving body, comprising a receiving portion and an internal channel, wherein the receiving portion comprises a layer structure provided with a receiving space, and the internal channel allows a fluid to pass through; as well as a battery unit accommodated in the accommodation space, The battery cells are in thermal contact with a fluid passing through the internal passage.

2. The energy storage device according to claim 1, wherein: The containing body includes one or more holes to communicate the internal passage with the outside of the containing body.

3. The energy storage device according to claim 2, wherein: The receiving body includes a fan at a position corresponding to the one or more holes, The fan moves fluid outside the containing body to the internal passage.

4. The energy storage device according to claim 1, wherein: The battery cell includes a terminal protruding on at least one side, A surface of the battery cell other than a surface from which the terminal protrudes is in thermal contact with the fluid passing through the internal passage.

5. The energy storage device according to claim 4, wherein: The battery cell includes a terminal protruding on only one side, A face of the battery cell opposite to a face from which the terminal protrudes is in thermal contact with a fluid passing through the internal passage.

6. The energy storage device according to claim 4, wherein: The terminal protrudes toward the outside of the receiving body.

7. The energy storage device according to claim 1, wherein: The layer structure includes a resin layer on an inner wall where the accommodation space is provided.

8. The energy storage device according to claim 7, wherein: The layer structure compresses the battery cell accommodated in the accommodation space.

9. The energy storage device according to claim 1, wherein: The receiving body includes a plurality of receiving parts.

10. The energy storage device according to claim 9, wherein: The internal passage is located between the plurality of receiving portions.

11. The energy storage device according to claim 2, further comprising: a front cover covering at least a portion of the one or more holes, The front cover includes a fluid passage portion that allows fluid to pass through at a position corresponding to the one or more holes.

12. The energy storage device according to claim 11, wherein: The front cover further includes a spacer, The spacer is connected to the receiving body.

13. The energy storage device according to claim 12, wherein: The fluid passage portion is spaced apart from the one or more holes.

14. The energy storage device according to claim 1, wherein: The containing body comprises a heat-conducting baffle, The heat conductive baffle is located between the accommodation portion and the internal channel.

15. The energy storage device according to claim 14, wherein: The battery cell is in direct contact with the thermally conductive spacer.

16. The energy storage device according to claim 1, wherein: The containment body comprises steel.

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