Insulating member, battery module, and method for manufacturing battery module

Abstract

An insulating member, a battery module, and a method of manufacturing the battery module are disclosed. The insulating member may include: a heat insulating material formed along a periphery of the battery cell and having a space formed therein; and a potting liquid filled into a space within the heat insulating material.

Description

[0001] This application claims priority and benefit to Korean Patent Application No. 10-2024-0168793, filed on November 22, 2024, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical Field

[0002] This disclosure relates to insulating components, battery modules, and methods for manufacturing battery modules, and more specifically, to insulating components, battery modules, and methods for manufacturing battery modules in which the spaces within an insulating material having formed spaces are filled with potting fluid. Background Technology

[0003] Unlike primary batteries, which are not designed for charging, secondary batteries are designed for discharging and recharging. Low-capacity secondary batteries are used in small portable electronic devices such as smartphones, feature phones, laptops, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as power sources for driving motors (such as those in hybrid or electric vehicles) and for energy storage. A secondary battery includes an electrode assembly containing positive and negative electrodes, a housing that houses the electrode assembly, and terminal portions that connect to the electrode assembly.

[0004] In a battery module comprising multiple battery cells, insulating components are inserted between the battery cells. Conventional insulating components are made of a single insulating material. As described herein, conventional insulating components made of a single insulating material have problems with insufficient performance in preventing heat transfer and limited lifespan, both of which are necessary for insulating components.

[0005] The information disclosed herein in the Background section is intended to enhance understanding of the background of this disclosure, and therefore may contain information that does not constitute related (or prior art). Summary of the Invention

[0006] The embodiments of this disclosure aim to provide an insulating component, a battery module, and a method for manufacturing a battery module, wherein the space within a heat-insulating material having septa is filled with a potting fluid.

[0007] However, the technical problems to be solved by this disclosure are not limited to those described herein, and those skilled in the art will clearly understand from the description of this disclosure herein other problems not mentioned herein, as well as aspects and features of this disclosure that will solve such problems.

[0008] An insulating member according to an embodiment of the present disclosure may include: a heat-insulating material formed along the periphery of a battery cell and having a space therein; and a potting fluid filled into the space within the heat-insulating material.

[0009] In an embodiment, the potting fluid can harden after being filled into the space within the insulation material while the battery cells and insulation material have been stacked and compressed such that the insulation material is placed between the first battery cell and the second battery cell.

[0010] In an embodiment, the insulation material may have a closed left, right and bottom portion and an open top portion.

[0011] In this embodiment, the insulation material may be formed from polyurethane foam.

[0012] In the embodiments, the potting fluid may have a thermal conductivity of less than 0.2 W / mK.

[0013] In an embodiment, the potting solution may include 5 wt% to 10 wt% silica, 15 wt% to 30 wt% aluminum hydroxide and 60 wt% to 80 wt% polydimethylsiloxane.

[0014] In the embodiments, less than 0.05 wt% of platinum may be added to the potting solution.

[0015] A battery module according to an embodiment of the present disclosure may include: a plurality of battery cells; and an insulating member disposed between a first battery cell and a second battery cell. The insulating member may include: a heat-insulating material formed along the periphery of the battery cell and having a space therein; and a potting fluid filled into the space within the heat-insulating material.

[0016] In an embodiment, the potting fluid can harden after being filled into the space within the insulation material while the battery cells and insulation material have been stacked and compressed such that the insulation material is placed between the first battery cell and the second battery cell.

[0017] In an embodiment, the insulation material may have a closed left, right and bottom portion and an open top portion.

[0018] In this embodiment, the insulation material may be formed from polyurethane foam.

[0019] In the embodiments, the potting fluid may have a thermal conductivity of less than 0.2 W / mK.

[0020] In an embodiment, the potting solution may include 5 wt% to 10 wt% silica, 15 wt% to 30 wt% aluminum hydroxide and 60 wt% to 80 wt% polydimethylsiloxane.

[0021] In the embodiments, the potting solution may also include less than 0.05 wt% platinum.

[0022] A method for manufacturing a battery module according to an embodiment of the present disclosure may include the following steps: providing a plurality of battery cells; stacking the plurality of battery cells such that a heat-insulating material is placed between a first battery cell and a second battery cell, the heat-insulating material being formed along the periphery of the battery cell and having a space therein; extruding the heat-insulating material, the first battery cell, and the second battery cell; and filling the space within the heat-insulating material between the first battery cell and the second battery cell with a potting liquid and hardening the potting liquid.

[0023] In an embodiment, the step of stacking multiple battery cells such that an insulating material is placed between a first battery cell and a second battery cell may include: providing an insulating material having a closed left side portion, a right side portion and a bottom portion and an open top portion.

[0024] In one embodiment, the step of stacking multiple battery cells such that an insulating material is placed between a first battery cell and a second battery cell may include providing an insulating material formed of polyurethane foam.

[0025] In an embodiment, the step of filling and hardening the potting fluid may include providing a potting fluid having a thermal conductivity of less than 0.2 W / mK.

[0026] In an embodiment, the step of filling and hardening the potting solution may include providing a potting solution comprising 5 wt% to 10 wt% silica, 15 wt% to 30 wt% aluminum hydroxide and 60 wt% to 80 wt% polydimethylsiloxane.

[0027] In an embodiment, the step of filling and hardening the potting solution may include adding less than 0.05 wt% platinum to the potting solution.

[0028] According to embodiments of this disclosure, because the potting fluid fills the space within the insulating material in which the space is formed, the performance in preventing heat transfer or the lifespan performance can be improved compared to conventional insulating components made of a single insulating material.

[0029] According to embodiments of this disclosure, since the potting fluid is filled into the space within the insulation material and then hardened after the battery cell and the insulation material have been stacked and compressed such that the insulation material is placed between the first battery cell and the second battery cell, it is possible to easily form an insulating member in which the space within the insulation material is filled with potting fluid.

[0030] The advantages of the embodiments disclosed herein are that, because the potting fluid filling the space within the insulating material is made of a material including silicon, insulation properties can be achieved, and volume changes due to the expansion of the battery cells can also be accommodated.

[0031] However, the aspects and features of this disclosure are not limited to those described herein, and those skilled in the art will clearly understand from the detailed description herein other aspects and features not mentioned. Attached Figure Description

[0032] The accompanying drawings illustrate embodiments of the present disclosure and, together with the detailed description thereof, further describe aspects and features of the disclosure. Therefore, the present disclosure should not be construed as limited to the drawings.

[0033] Figure 1A This is a top perspective view of a prismatic secondary battery.

[0034] Figure 1B It is along Figure 1A A sectional view taken by line I-I'.

[0035] Figure 2A This is a perspective view of a conventional battery module.

[0036] Figure 2B This is an exploded view of a conventional battery module.

[0037] Figure 3A and Figure 3B This is a diagram illustrating a method for manufacturing a conventional battery module.

[0038] Figure 4 This is a diagram illustrating an insulating member according to an embodiment of the present disclosure.

[0039] Figures 5A to 5C This is a diagram illustrating a method for manufacturing a battery module including insulating components according to an embodiment of the present disclosure. Detailed Implementation

[0040] Exemplary embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. Before description, it should be noted that the terms or words used in this specification and claims should not be construed as limited to their ordinary or dictionary meanings, but rather should be understood to have meanings and concepts consistent with the spirit of this disclosure, based on the principle that the inventor can appropriately define the concept of each term to describe his / her own disclosure in the best possible way. Therefore, since the embodiments described in this specification and the configurations shown in the drawings are merely examples of this disclosure and do not cover all the technical ideas of this disclosure, it should be understood that various changes and modifications can be made upon filing this application.

[0041] It will also be understood that when the terms “including / comprise” and / or variations thereof are used herein, it indicates the presence of the stated features, wholes, steps, operations, elements, components and / or groups thereof, but does not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof.

[0042] For ease of understanding of this disclosure, the drawings are not to scale, and the dimensions of some components may be exaggerated. It should be noted that the same reference numerals designate the same components in different embodiments.

[0043] Referring to two compared elements, features, etc., as “identical” means that they are “substantially identical.” Therefore, the phrase “substantially identical” can include what is considered a low deviation in the art, for example, 5% or less. The uniformity of any parameter in a given region can mean that it is uniform from an average perspective.

[0044] Although terms such as “first” and / or “second” are used to describe various components, these components are of course not limited by these terms. These terms are only used to distinguish one component from another. Therefore, unless specifically stated to the contrary, a first component may be referred to as a second component without departing from the teachings of the exemplary embodiments.

[0045] Throughout this specification, unless otherwise stated, each element may be singular or plural.

[0046] The arrangement of any component "above (or below)" or "on (or under)" a component can mean that any component is positioned to contact the upper (or lower) surface of that component, and that other components can be positioned between that component and any components positioned on (or below) that component.

[0047] It will be understood that when a component is referred to as “connected,” “joined,” or “engaged” to another component, that component can not only be “connected,” “joined,” or “engaged” to said other component directly, but also indirectly “connected,” “joined,” or “engaged” to said other component with other components situated between them.

[0048] As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. The use of “may” when describing embodiments of this disclosure refers to “one or more embodiments of this disclosure”. Expressions such as “at least one of…” and “one or more…” preceding / following a list of elements modify the entire list of elements, rather than individual elements within that list.

[0049] Throughout this specification, unless otherwise stated, the statement "A and / or B" means A, B, or A and B. Furthermore, unless specifically stated to the contrary, the statement "C to D" means C or greater and D or less.

[0050] When phrases such as “at least one of A, B and C (species / beings)”, “at least one of A, B or C (species / beings)”, “at least one of the group selected from A, B and C (species / beings)” or “at least one of A, B and C (species / beings)” are used to specify a list of elements A, B and C, the phrase can refer to any and all suitable combinations.

[0051] The term “use” may be considered synonymous with the term “utilize”. As used herein, the terms “basically,” “about,” and similar terms are used as approximate terms rather than terms of degree and are intended to explain the inherent variations in measured or calculated values ​​that would be recognized by one of ordinary skill in the art.

[0052] It will be understood that although the terms first, second, third, etc., may be used herein to describe various elements, components, regions, layers, and / or portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or portion from another element, component, region, layer, or portion. Therefore, without departing from the teachings of the exemplary embodiments, the first element, first component, first region, first layer, or first portion discussed herein may be referred to as a second element, second component, second region, second layer, or second portion.

[0053] For ease of interpretation when describing the relationship between one element or feature shown in the accompanying drawings and another element or feature(s), spatial relative terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein. It will be understood that, in addition to the orientations depicted in the drawings, spatial relative positions are intended to encompass different orientations of the device in use or operation. For example, if the device in the drawings is flipped, any element described as “below” or “under” another element will subsequently be oriented “above” or “above” another element. Thus, the term “below” can encompass both upward and downward directions.

[0054] The terminology used herein is for the purpose of describing embodiments of this disclosure and is not intended to limit this disclosure.

[0055] This disclosure will be described in detail with reference to the accompanying drawings.

[0056] Examples of secondary batteries include coin-shaped, cylindrical, prismatic, and pouch-shaped types. This disclosure is essentially applicable to prismatic secondary batteries. Therefore, prismatic secondary batteries will first be briefly described before describing embodiments of this disclosure.

[0057] Figure 1A This is a top perspective view of a prismatic secondary battery. Figure 1B It is along Figure 1AA sectional view taken by line I-I'.

[0058] First, the description Figure 1A The appearance of the prismatic secondary battery shown.

[0059] The housing 51 defines the overall appearance of the prismatic secondary battery and can be made of a conductive metal such as aluminum, aluminum alloy, or nickel-plated steel. Furthermore, the housing 51 provides space for housing the electrode assembly therein.

[0060] The cover assembly 60 may include a cover plate 61 that covers the opening of the housing 51, and the cover plate 61 may be made of a conductive material. Here, the first terminal 62 and the second terminal 63 may be electrically connected to corresponding positive and negative electrodes (or negative and positive electrodes) inside the housing, and may be mounted to protrude outward through the cover plate 61.

[0061] The cover plate 61 may be equipped with an electrolyte injection port 64 formed for installing a sealing plug and a vent port 66 formed with a notch 65. The vent port 66 is used to vent the secondary battery, that is, to discharge the gas generated inside the secondary battery.

[0062] Reference Figure 1B The internal structure of the prismatic secondary battery and its connection structure with the cover assembly 60 will be described.

[0063] like Figure 1B As shown, the prismatic secondary battery may substantially include an electrode assembly 40, a first current collector 41, a first terminal 62, a second current collector 42, a second terminal 63, and a cover assembly 60.

[0064] Electrode assembly 40 can be formed by winding or stacking a first electrode plate, a diaphragm, and a second electrode plate in the form of a plate or film. When electrode assembly 40 is a wound laminate, it can have a winding axis parallel to the longitudinal direction of the housing. Electrode assembly 40 can be stacked rather than wound, but the shape of electrode assembly 40 is not limited in this disclosure. Furthermore, electrode assembly 40 can be a Z-stacked electrode assembly in which the first and second electrode plates are inserted into both sides of a diaphragm bent into a Z-stack. Furthermore, electrode assembly 40 can consist of one or more electrode assemblies stacked such that their long sides are adjacent to each other and housed in a housing, and the number of electrode assemblies is not limited in this disclosure. Electrode assembly 40 can have a first electrode plate serving as a negative electrode and a second electrode plate serving as a positive electrode, or vice versa.

[0065] The first electrode plate can be formed by applying a first electrode active material (such as graphite or carbon) to a first electrode current collector made of metal foil (such as copper, copper alloy, nickel, or nickel alloy). The first electrode plate may include a first electrode tab (or first uncoated portion) 43 as a region where the first electrode active material is not applied. The first electrode tab 43 can serve as a current flow channel between the first electrode plate and the first current collector 41. In some examples, the first electrode tab 43 can be formed by pre-cutting the first electrode plate to protrude to one side during the manufacture of the first electrode plate, or it can protrude further to one side than the diaphragm without the need for separate cutting.

[0066] The second electrode plate can be formed by applying a second electrode active material (such as a transition metal oxide) to a second electrode current collector made of a metal foil such as aluminum or an aluminum alloy. The second electrode plate may include a second electrode tab (or a second uncoated portion) 44 as a region where the second electrode active material is not applied. The second electrode tab 44 can serve as a current flow channel between the second electrode plate and the second current collector 42. In some examples, the second electrode tab 44 can be formed by pre-cutting the second electrode plate to protrude to one side during the manufacture of the second electrode plate, or it can protrude further to one side than the diaphragm without the need for separate cutting.

[0067] In some embodiments, the first electrode contact 43 may be located on the right end of the electrode assembly 40, and the second electrode contact 44 may be located on the left end of the electrode assembly 40. Optionally, the first electrode contact 43 and the second electrode contact 44 may be located on one end of the electrode assembly 40 in the same direction. Here, for ease of explanation, left and right are represented based on the secondary battery shown in FIG1, and their positions may change when the secondary battery is rotated left and right or up and down.

[0068] The separator is used to prevent short circuits between the first and second electrode plates while allowing lithium ions to migrate between them. The separator can be made of, for example, polyethylene membrane, polypropylene membrane, polyethylene-polypropylene membrane, etc.

[0069] As described herein, the first electrode tab 43 of the first electrode plate and the second electrode tab 44 of the second electrode plate extend from both ends of the electrode assembly 40, respectively. In some embodiments, the electrode assembly 40 may be housed together with the electrolyte in a housing 51.

[0070] In the electrode assembly 40, the first current collector 41 and the second current collector 42 can be welded and connected to the first electrode terminal 43 extending from the first electrode plate and the second electrode terminal 44 extending from the second electrode plate, respectively.

[0071] For reference Figure 1BAs described, the first current collector 41 and the second current collector 42 are respectively connected to the first terminal 62 and the second terminal 63 via terminal pins 67. In some embodiments, the terminal pins 67 may each have a threaded outer peripheral surface and can be fastened to the first terminal 62 and the second terminal 63 by threaded connection. However, this disclosure is not limited thereto. For example, the terminal pins 67 may also be riveted or welded to the first terminal 62 and the second terminal 63.

[0072] Figure 2A This is a perspective view of a conventional battery module. Figure 2B This is an exploded view of a conventional battery module.

[0073] Reference Figure 2A and Figure 2B A conventional battery module 10 may include multiple battery cells 11, insulating components 12, end insulating components 13, end plates 14, side insulating components 15, busbar assembly 16, cell management controller (CMC) 17, top cover 18, and side plates 19.

[0074] Multiple battery cells 11 can each be a reference. Figure 1A and Figure 1B The prism-shaped secondary battery described.

[0075] The insulating member 12 can be disposed between multiple battery cells 11 and can prevent current from flowing between multiple battery cells 11 or heat from being transferred between multiple battery cells 11.

[0076] The end insulation member 13 can be disposed between the outermost battery cell 11 and the end plate 14 among a plurality of battery cells 11, and can prevent current from flowing out of the outermost battery cell 11 or heat from being transferred out of the outermost battery cell 11.

[0077] The end plate 14 can be set on the outside of the outermost battery cell 11 and can protect multiple battery cells 11.

[0078] Side insulation member 15 can be provided on the side of multiple battery cells 11 and can prevent current from flowing to the outside through the side of multiple battery cells 11 or heat from being transferred to the outside through the side of multiple battery cells 11.

[0079] The busbar assembly 16 can form an electrical connection between multiple battery cells 11 to meet the capacity required by the battery module 10.

[0080] CMC 17 can monitor and control the current, voltage, or temperature of each of the multiple battery cells 11 included in the battery module 10.

[0081] The top cover 18 and the side plate 19 can be respectively installed on the multiple battery cells 11 and on the sides of the multiple battery cells 11, and can play a role in protecting the multiple battery cells 11.

[0082] Figure 3A and Figure 3B This is a diagram illustrating a method for manufacturing a conventional battery module.

[0083] Reference Figure 3A and Figure 3B First, such as Figure 3A As shown, in a method of manufacturing a conventional battery module 10, when stacking multiple battery cells 11, the multiple battery cells can be stacked by attaching insulating members 12 between the battery cells. End insulating members 13 and end plates 14 can be disposed on the outer side of the outermost battery cell 11 among the multiple battery cells 11.

[0084] After that, as Figure 3B As shown, multiple stacked battery cells 11, insulating members 12 disposed between the battery cells, end insulating members 13, and end plates 14 can be pressed together. Subsequently, the battery module 10 can be completed by additionally assembling side insulating members 15, busbar assemblies 16, CMC 17, top cover 18, and side plates 19.

[0085] Because the insulating component is made of a single insulating material, the insulating component 12 used in a conventional battery module 10 has problems with insufficient performance and limited lifespan in preventing heat transfer, which are the requirements of the insulating component.

[0086] Figure 4 This is a diagram illustrating an insulating member according to an embodiment of the present disclosure.

[0087] Reference Figure 4 According to embodiments of the present disclosure, the insulating member 120 may include a heat-insulating material 121 and a potting fluid 122.

[0088] The insulating member 120 can be placed between the battery cells included in the battery module.

[0089] The thermal insulation material 121 can be formed along the periphery of the battery cell and can have a space formed therein. In an embodiment, such as Figure 4 As shown, the insulation material 121 may have a form where the left, right, and bottom sides of the insulation material are closed and the top of the insulation material is open. The insulation material 121 is formed in a way that allows the potting fluid 122 to be easily filled from the top of multiple battery cells. In an embodiment, the insulation material 121 may be formed of polyurethane foam.

[0090] The potting fluid 122 can fill the space within the insulating material 121. In an embodiment, after the battery cells and the insulating material have been stacked and compressed such that the insulating material 121 is positioned between the battery cells, the potting fluid 122 can be hardened after being filled into the space within the insulating material 121. In an embodiment, the potting fluid 122 can be made of a material with a relatively low thermal conductivity compared to the insulating material 121, thereby effectively preventing heat transfer between multiple battery cells. For example, the potting fluid 122 can have a thermal conductivity of less than 0.2 W / mK.

[0091] In one embodiment, the potting solution 122 may comprise 5 wt% to 10 wt% silica, 15 wt% to 30 wt% aluminum hydroxide, and 60 wt% to 80 wt% polydimethylsiloxane. The potting solution 122, filling the space within the insulating material 121, may be made of a material comprising silicon. Therefore, there is an advantage in achieving insulating properties and in handling volume changes due to the expansion of the battery cells. In another embodiment, less than 0.05 wt% platinum may be added to the potting solution 122.

[0092] Reference Figures 5A to 5C Detailed description of manufacturing includes having Figure 4 The method of the battery module 100 with insulating member 120 of the structure shown.

[0093] Figures 5A to 5C This is a diagram illustrating a method for manufacturing a battery module including insulating components according to an embodiment of the present disclosure.

[0094] Reference Figures 5A to 5C First, such as Figure 5A As shown, in the method of manufacturing a battery module 100 according to an embodiment of the present disclosure, when stacking a plurality of battery cells 110, the plurality of battery cells can be stacked by attaching a thermal insulation material 121 between the battery cells. An end insulating member 130 and an end plate 140 can be disposed on the outer side of the outermost battery cell 110 among the plurality of battery cells 110. In this case, as... Figure 5A As shown, the insulation material 121 may have a form in which the left, right and bottom sides of the insulation material are closed and the top of the insulation material is open.

[0095] In addition, such as Figure 5B As shown, multiple stacked battery cells 110, thermal insulation material 121 disposed between the battery cells, end insulation member 130 and end plate 140 can be pressed together.

[0096] After that, as Figure 5CAs shown, the potting liquid 122 can be hardened after the space within the potting liquid 122 is filled with the potting liquid 122, while the battery cells and the insulating material have been stacked and compressed so that the insulating material 121 is placed between the battery cells.

[0097] As described herein, the method for manufacturing a battery module 100 including an insulating member 120 according to an embodiment of the present disclosure, since the battery cells and the insulating material have been stacked and compressed such that the insulating material 121 is placed between the battery cells, and the potting liquid 122 is filled into the space within the insulating material 121 and then hardened, allows for easy formation of a battery module 100 including an insulating member 120. Figure 4 The potting fluid 122 shown has been filled into the insulating member 120 within the space of the insulating material 121.

[0098] Subsequently, according to the method of manufacturing a battery module 100 including an insulating member 120 according to an embodiment of the present disclosure, the battery module 100 can be completed by additionally assembling a side insulating member, a busbar assembly, a CMC, a top cover, and a side panel.

[0099] In the following, materials that can be used in secondary batteries according to embodiments of the present disclosure are described.

[0100] Compounds capable of reversibly inserting and deintercalating lithium (e.g., lithiation intercalation compounds) can be used as positive electrode active materials. Specifically, one or more of a composite oxide of lithium with a metal selected from cobalt, manganese, nickel, and combinations thereof can be used as positive electrode active materials.

[0101] The composite oxide can be a lithium transition metal composite oxide. Detailed examples of composite oxides may include lithium nickel oxides, lithium cobalt oxides, lithium manganese oxides, lithium iron phosphate compounds, cobalt-free lithium nickel manganese oxides, or combinations thereof.

[0102] For example, a compound represented by one of the following chemical formulas can be used. Li a A 1-b X b O 2-c D c (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Mn 2-b X b O 4-c D c (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Ni 1-b-c Co b Xc O 2-α D α (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, 0<α<2); Li a Ni 1-b-c Mn b X c O 2-α D α (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, 0<α<2); Li a Ni b Co c L 1 d G e O2 (0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, 0≤e≤0.1); Li a NiG b O2 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a CoG b O2 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-b G b O2 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn2G b O4 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-g G g PO4 (0.90≤a≤1.8, 0≤g≤0.5); Li (3-f) Fe2(PO4)3 (0≤f≤2); and Li a FePO4 (0.90≤a≤1.8).

[0103] In the chemical formula, A can be Ni, Co, Mn, or a combination thereof. X can be Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, rare earth elements, or a combination thereof; D can be O, F, S, P, or a combination thereof. G can be Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof. L 1 It can be Mn, Al, or a combination thereof.

[0104] The positive electrode for a lithium secondary battery may include a current collector and a layer of positive electrode active material formed on the current collector. The positive electrode active material layer may include a positive electrode active material, and may also include a binder and / or a conductive material.

[0105] With respect to 100 wt% of the positive electrode active material layer, the content of the positive electrode active material can be 90 wt% to 99.5 wt%. With respect to 100 wt% of the positive electrode active material layer, the content of each of the binder and the conductive material can be 0.5 wt% to 5 wt%.

[0106] Al can be used as the current collector, but the present disclosure is not limited thereto.

[0107] The negative electrode active material can include a material capable of reversibly intercalating / deintercalating lithium ions, lithium metal, an alloy of lithium metal, a material capable of doping and dedoping lithium, or a transition metal oxide.

[0108] Materials capable of reversibly intercalating / deintercalating lithium ions can include carbon-based negative electrode active materials, for example, crystalline carbon, amorphous carbon, or a combination thereof. Examples of crystalline carbon can include graphite, such as natural graphite or synthetic graphite. Examples of amorphous carbon can include soft carbon or hard carbon, mesophase pitch carbide, and calcined coke.

[0109] As a material capable of doping and dedoping lithium, Si-based negative electrode active materials or Sn-based negative electrode active materials can be used. The Si-based negative electrode active material can be silicon, a silicon-carbon composite, SiO x (0 < x ≤ 2), a Si-based alloy, or a combination thereof.

[0110] The silicon-carbon composite can be a composite of silicon and amorphous carbon. According to an embodiment, the silicon-carbon composite can include silicon particles and can have a form in which amorphous carbon is coated on the surface of the silicon particles.

[0111] The silicon-carbon composite can also include crystalline carbon. For example, the silicon-carbon composite can include a core containing crystalline carbon and silicon particles and an amorphous carbon coating layer provided on the surface of the core.

[0112] The negative electrode for a lithium secondary battery can include a current collector and a negative electrode active material layer provided on the current collector. The negative electrode active material layer can include a negative electrode active material and can also include a binder and / or a conductive material.

[0113] For example, the negative electrode active material layer can include 90 wt% to 99 wt% of the negative electrode active material, 0.5 wt% to 5 wt% of the binder, and 0 wt% to 5 wt% of the conductive material.

[0114] ? As the binder, a non-aqueous binder, an aqueous binder, a dry binder, or a combination thereof can be used. If an aqueous binder is used as the binder for the negative electrode, the binder for the negative electrode can also include a cellulose-based compound capable of imparting viscosity.

[0115] As a current collector for the negative electrode, one of the following can be used: nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, a polymer matrix coated with a conductive metal, and combinations thereof.

[0116] Electrolytes used in lithium secondary batteries may include non-aqueous organic solvents and lithium salts.

[0117] Non-aqueous organic solvents can act as a medium through which ions involved in the electrochemical reactions of a battery can move.

[0118] Non-aqueous organic solvents can be carbonate solvents, ester solvents, ether solvents, ketone solvents, alcohol solvents, aprotic solvents, or combinations thereof. As non-aqueous organic solvents, carbonate solvents, ester solvents, ether solvents, ketone solvents, alcohol solvents, or aprotic solvents can be used alone or in combination of two or more of them.

[0119] In addition, if carbonate solvents are used, cyclic carbonates and chain carbonates can be mixed and used.

[0120] Depending on the type of lithium-ion secondary battery, a separator may be present between the positive and negative electrodes. Polyethylene, polypropylene, and polyvinylidene fluoride, or multilayers having two or more of these layers, can be used as separators.

[0121] The membrane may include a porous substrate and a coating layer comprising organic, inorganic or a combination thereof disposed on one or both sides of the porous substrate.

[0122] Organic materials may include polyvinylidene fluoride polymers or (meth)acrylic acid polymers.

[0123] Inorganic materials may include inorganic particles selected from Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite, and combinations thereof, but this disclosure is not limited thereto.

[0124] Organic and inorganic materials can be in the form in which organic and inorganic materials are mixed in a coating layer or in the form of a coating layer including organic materials and a coating layer including inorganic materials stacked together.

Claims

1. An insulating member disposed between battery cells, the insulating member comprising: Thermal insulation material is formed along the periphery of the battery cell, and a space is formed therein; as well as The potting fluid is filled into the space within the insulation material.

2. The insulating member according to claim 1, wherein, The potting fluid hardens after being filled into the space within the insulation material, with the battery cells and the insulation material stacked and compressed such that the insulation material is placed between the first and second battery cells.

3. The insulating member according to claim 1, wherein, The insulation material has a closed left, right and bottom portion and an open top portion.

4. The insulating member according to claim 1, wherein, The insulation material is formed of polyurethane foam.

5. The insulating member according to claim 1, wherein, The potting fluid has a thermal conductivity of less than 0.2 W / mK.

6. The insulating member according to claim 1, wherein, The potting solution comprises 5 wt% to 10 wt% silica, 15 wt% to 30 wt% aluminum hydroxide, and 60 wt% to 80 wt% polydimethylsiloxane.

7. The insulating member according to claim 6, wherein, Less than 0.05 wt% of platinum was added to the potting solution.

8. A battery module, the battery module comprising: Multiple battery cells; as well as An insulating component is placed between the first battery cell and the second battery cell. The insulating component includes: Thermal insulation material is formed along the periphery of the battery cell, and spaces are formed therein; and The potting fluid is filled into the space within the insulation material.

9. The battery module according to claim 8, wherein, The potting fluid hardens after being filled into the space within the insulation material, with the battery cells and the insulation material stacked and compressed such that the insulation material is placed between the first battery cell and the second battery cell.

10. The battery module according to claim 8, wherein, The insulation material has a closed left, right and bottom portion and an open top portion.

11. The battery module according to claim 8, wherein, The insulation material is formed of polyurethane foam.

12. The battery module according to claim 8, wherein, The potting fluid has a thermal conductivity of less than 0.2 W / mK.

13. The battery module according to claim 8, wherein, The potting solution comprises 5 wt% to 10 wt% silica, 15 wt% to 30 wt% aluminum hydroxide, and 60 wt% to 80 wt% polydimethylsiloxane.

14. The battery module according to claim 13, wherein, The potting solution also includes less than 0.05 wt% platinum.

15. A method for manufacturing a battery module, the method comprising the following steps: Provide multiple battery cells; The plurality of battery cells are stacked such that thermal insulation material is placed between the first battery cell and the second battery cell, the thermal insulation material being formed along the periphery of the battery cell and having a space therein; The thermal insulation material, the first battery cell, and the second battery cell are extruded. as well as The potting fluid is filled into the space within the insulating material between the first battery cell and the second battery cell, and the potting fluid is then hardened.

16. The method according to claim 15, wherein, The step of stacking the plurality of battery cells such that the insulating material is placed between the first battery cell and the second battery cell includes: providing the insulating material having a closed left side portion, a closed right side portion and a closed bottom portion and an open top portion.

17. The method according to claim 15, wherein, The step of stacking the plurality of battery cells such that the insulation material is placed between the first battery cell and the second battery cell includes: providing the insulation material formed of polyurethane foam.

18. The method according to claim 15, wherein, The step of filling and hardening the potting fluid includes providing the potting fluid having a thermal conductivity of less than 0.2 W / mK.

19. The method according to claim 15, wherein, The step of filling and hardening the potting solution includes providing the potting solution comprising 5 wt% to 10 wt% silica, 15 wt% to 30 wt% aluminum hydroxide and 60 wt% to 80 wt% polydimethylsiloxane.

20. The method of claim 15, wherein, The step of filling and hardening the potting solution includes adding less than 0.05 wt% platinum to the potting solution.

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