Battery module and battery pack comprising same

Abstract

A battery module according to the present invention comprises: a secondary battery comprising an electrode lead; a module case configured to accommodate the secondary battery, and including a mesh part having a mesh shape; and a refractory paint layer applied to the mesh part, and foamed by heat of a predetermined temperature or higher.

Description

Battery module and battery pack including same

[0001] [Cross-reference with related applications]

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2023-0162806, filed November 21, 2023, the entire disclosure of which is incorporated herein by reference.

[0003] [Technical Field]

[0004] The present invention relates to a battery module and a battery pack including the same. More specifically, the invention relates to a battery module and a battery pack including the same for preventing the spread of flames when flames occur in a secondary battery.

[0005] With the technological development and increasing demand for electric vehicles, mobile devices, and other devices, the demand for secondary batteries as an energy source is increasing. Unlike primary batteries, secondary batteries can be recharged and reused after a single use. A secondary battery consists of an anode and a cathode. When a metal is oxidized at the anode, electricity is generated by the movement of electrons released from the metal. The oxidized metal moves to the cathode through the electrolyte and is reduced.

[0006] To manufacture such a secondary battery, an electrode active material slurry is first applied to a positive electrode current collector and a negative electrode current collector to manufacture a positive electrode and a negative electrode, which are then laminated on both sides of a separator to form an electrode assembly. The electrode assembly is then housed in a battery case, filled with electrolyte, and sealed.

[0007] Secondary batteries may be arranged in multiples to form a battery module. The battery module may be connected to a battery management system (BMS) that manages the voltages of the multiple secondary batteries simultaneously, such that the BMS may be configured to consistently manage the voltages of each of the multiple secondary batteries.

[0008] Battery modules may be arranged in multiples to form a battery pack. The battery pack may include a cooling device configured to manage the heat generation of each of the battery modules, thereby allowing the battery modules to operate within a temperature range within which they can operate normally. Such a battery pack may be installed in a device requiring electricity, such as an automobile, to supply electricity to the device.

[0009] However, secondary batteries may experience thermal runaway due to side reactions, etc., and when the secondary battery experiences thermal runaway, a flame may occur in the secondary battery. When a flame occurs in a secondary battery, the flame may spread to neighboring secondary batteries. In this case, when the flame spreads within one battery module and the flame spreads to neighboring battery modules, the flame may spread to the entire battery pack. If the flame spreads to the entire battery pack, not only does it cause the problem of replacing the secondary battery, but it may also cause a problem that may threaten the life of the user if the user is riding in a device that was driven by the secondary battery.

[0010] The present invention has been devised to solve the above problems, and the task of the present invention is to prevent the spread of flame from a battery module including the secondary battery to another adjacent battery module when a flame occurs in the secondary battery.

[0011] The technical problems to be achieved in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present disclosure belongs from the description below.

[0012] A battery module according to one embodiment of the present invention comprises a secondary battery including an electrode lead, a module case configured to accommodate the secondary battery, the module case including a mesh portion having a mesh shape, and a refractory paint layer applied to the mesh portion, the refractory paint layer being foamed by heat above a predetermined temperature.

[0013] The mesh portion may be formed with a plurality of mesh holes arranged at a predetermined interval.

[0014] The module case includes an end plate facing the electrode leads, the end plate includes a first mesh portion facing the electrode leads, a refractory paint layer applied to the first mesh portion is defined as a first refractory paint layer, and the first refractory paint layer can be applied to a surface of the first mesh portion facing the electrode leads.

[0015] The first refractory paint layer can penetrate a plurality of mesh holes formed in the first mesh portion.

[0016] The first refractory paint layer may be applied to the opposite side of the first mesh portion facing the electrode leads.

[0017] The plurality of mesh holes may have the shape of a groove.

[0018] The module case includes a module case body including a side surface so as to form a battery-accommodating space capable of accommodating a secondary battery, the module case body includes a second mesh portion facing the secondary battery, and a refractory paint layer applied to the second mesh portion is defined as a second refractory paint layer, and the second refractory paint layer can be applied to a surface of the second mesh portion facing the secondary battery.

[0019] The second refractory paint layer can penetrate a plurality of mesh holes formed in the second mesh portion.

[0020] A second refractory paint layer may be applied to the opposite side of the second mesh portion facing the secondary battery.

[0021] The second mesh section may be provided on the side of the module case body.

[0022] It may further include an insulating sheet positioned between the secondary battery and the lower surface of the module case body.

[0023] A module cover configured to cover a battery receiving space, which may further include a module cover having a vent hole formed therein.

[0024] A refractory paint layer may not be applied to the module cover.

[0025] The refractory paint layer can be applied to the module case by injection molding.

[0026] The module case may be made of metal.

[0027] A battery module according to one embodiment of the present invention includes a secondary battery including an electrode lead, a module case configured to accommodate the secondary battery, a bus bar electrically connected to the electrode lead, a bus bar frame configured to be mounted with the bus bar and accommodated within the module case, the bus bar frame including a mesh portion having a mesh shape, and a refractory paint layer applied to the mesh portion, the refractory paint layer being foamed by heat above a predetermined temperature.

[0028] The mesh portion may be formed with a plurality of mesh holes arranged at a predetermined interval.

[0029] The module case may include another mesh portion of mesh shape.

[0030] The busbar frame may be made of a polymer material.

[0031] A battery pack according to one embodiment of the present invention includes a battery module and a pack case configured to accommodate the battery module, wherein the battery module includes a secondary battery including an electrode lead, a module case configured to accommodate the secondary battery, the module case including an end plate facing the electrode lead, and a refractory paint layer applied to the inside of the module case, the refractory paint layer including a first refractory paint layer applied to the end plate, and the end plate includes a mesh portion having a mesh shape so that the first refractory paint layer is applied.

[0032] The battery module according to the present invention comprises a module case including a mesh portion having a mesh shape and a fire-resistant paint layer applied to the mesh portion, wherein the fire-resistant paint layer is foamed by heat above a predetermined temperature, thereby preventing the spread of flame from a battery module including the secondary battery to another adjacent battery module when a flame occurs in the secondary battery.

[0033] Alternatively, the battery module according to the present invention includes a busbar frame including a mesh portion having a mesh shape and a fire-resistant paint layer applied to the mesh portion, and the fire-resistant paint layer is foamed by heat above a predetermined temperature, thereby preventing the spread of the flame from the battery module including the secondary battery to another adjacent battery module when a flame occurs in the secondary battery.

[0034] The effects that can be obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by a person having ordinary skill in the art to which the present disclosure pertains from the description below.

[0035] Figure 1 is a perspective view of a battery module according to a first embodiment of the present invention.

[0036] Figure 2 is an exploded view of the battery module illustrated in Figure 1.

[0037] Figure 3 is an assembly diagram of the secondary battery illustrated in Figure 2.

[0038] FIG. 4 is a rear perspective view showing the end plate and its surrounding configuration of the battery module illustrated in FIG. 2.

[0039] Figure 5 is a front perspective view of the end plate illustrated in Figure 4.

[0040] Figure 6 is an enlarged perspective view of section VI of the end plate illustrated in Figure 5.

[0041] Fig. 7 is a cross-sectional view showing the battery module illustrated in Fig. 1 cut along line Ⅶ-Ⅶ'.

[0042] Fig. 8 is an enlarged cross-sectional view of the battery module Ⅷ illustrated in Fig. 7.

[0043] Fig. 9 is a perspective view showing the module case body illustrated in Fig. 2.

[0044] Fig. 10 is a cross-sectional view showing the battery module shown in Fig. 1 cut along line Ⅹ-Ⅹ'.

[0045] Figure 11 is a conceptual diagram illustrating a side reaction occurring in a secondary battery of the battery module illustrated in Figure 7.

[0046] Figure 12 is a conceptual diagram illustrating the foaming of a refractory paint layer by the propagation of flames or the like in the secondary battery illustrated in Figure 11.

[0047] Fig. 13 is a conceptual diagram illustrating the end plate illustrated in Fig. 5 accommodated within an injection device.

[0048] Fig. 14 is a conceptual diagram illustrating an injection molded article combined with the end plate illustrated in Fig. 13.

[0049] Figure 15 is a conceptual diagram illustrating the end plate illustrated in Figure 14 separated from the injection device.

[0050] FIG. 16 is an exploded view illustrating a battery pack including the battery module illustrated in FIG. 1.

[0051] Fig. 17 is an enlarged view of a mesh portion according to a second embodiment of the present invention.

[0052] Fig. 18 is an enlarged view of a mesh portion according to a third embodiment of the present invention.

[0053] Fig. 19 is a cross-sectional view of a mesh portion according to the fourth embodiment of the present invention.

[0054] Fig. 20 is a cross-sectional view of a mesh portion and its surrounding structure according to a fifth embodiment of the present invention.

[0055] Fig. 21 is a cross-sectional view of a battery module according to the sixth embodiment of the present invention.

[0056] Fig. 22 is a rear perspective view of a busbar frame according to the seventh embodiment of the present invention.

[0057] Hereinafter, with reference to the attached drawings, preferred embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the invention. However, the present invention may be implemented in various different forms and is not limited or restricted by the following examples.

[0058] In order to clearly explain the present invention, a detailed description of a part that is irrelevant to the description or a related known technology that may unnecessarily obscure the gist of the present invention has been omitted, and when adding reference signs to components of each drawing in this specification, the same or similar reference signs are attached to the same or similar components throughout the specification.

[0059] In addition, terms and words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted as meanings and concepts that conform to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term to explain his or her own invention in the best way.

[0060] It should be understood that the various embodiments and terms used in this document are not intended to limit the technical features described in this document to specific embodiments, but rather to encompass various modifications, equivalents, or alternatives of the embodiments.

[0061] In connection with the description of the drawings, similar reference numerals may be used for similar or related components.

[0062] The singular form of a noun corresponding to an item may include one or more of said items, unless the relevant context clearly indicates otherwise.

[0063] In this document, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" may include any one of the items listed together in that phrase, or all possible combinations thereof.

[0064] The term “and / or” includes any combination of a plurality of related described elements or any one of a plurality of related described elements.

[0065] Terms such as "first," "second," or "first" or "second" may be used simply to distinguish one component from another and do not qualify the components in any other respect (e.g., importance or order).

[0066] When a component (e.g., a first component) is referred to as being "coupled" or "connected" to another component (e.g., a second component), with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0067] The terms “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in this document, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0068] When a component is said to be “connected,” “coupled,” “supported,” or “in contact with” another component, this includes not only cases where the components are directly connected, coupled, supported, or in contact, but also cases where the components are indirectly connected, coupled, supported, or in contact through a third component.

[0069] When we say that a component is "on" another component, this includes not only cases where the component is in contact with the other component, but also cases where there is another component between the two components.

[0070] Meanwhile, the terms “upper and lower directions,” “lower side,” and “front and rear directions” used in the following description are defined based on the drawings, and the shape and position of each component are not limited by these terms.

[0071] Specifically, as illustrated in Fig. 1, the direction in which the end plate (130) faces is defined as the front-back direction, and the up-down direction and left-right direction can be defined based on this.

[0072] Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings.

[0073] Example 1

[0074] Fig. 1 is a perspective view of a battery module (BM) according to a first embodiment of the present invention. Fig. 2 is an exploded view of the battery module (BM) illustrated in Fig. 1. Fig. 3 is an assembled view of the secondary battery (B) illustrated in Fig. 2.

[0075] Referring to FIGS. 1 to 3, a battery module (BM) and a secondary battery (B) included in the battery module (BM) according to a first embodiment of the present invention are described.

[0076] As illustrated in FIG. 2, at least one secondary battery (B) may form a battery module (BM). The battery module (BM) may include a battery case (20) forming a battery accommodation space (100S) capable of accommodating the secondary battery (B). The secondary batteries (B) may be provided in multiple numbers and may be stacked in one direction. The module case (100) may have a shape that corresponds to the shapes of the multiple secondary batteries (B). That is, the module case (100) may be formed with a battery accommodation space (100S) capable of accommodating the multiple secondary batteries (B). When multiple secondary batteries (B) are stacked to form one battery stack, the battery stack may have an approximately rectangular parallelepiped shape as a whole. Accordingly, the module case (100) may have an approximately rectangular parallelepiped shape corresponding to the battery stack so as to surround the battery stack.

[0077] The module case (100) may include a module case body (110) having a cross-section having a “U” shape and having an opening formed therein that communicates with a battery receiving space (100S). The module case (100) may include a module case (100) cover that covers at least one of the openings formed in the module case body (110). For example, the module case body (110) may be configured to cover the lower surface, left and right sides of the battery receiving space (100S), and the module case (100) cover may be configured to have a plate shape that covers the upper surface of the battery receiving space (100S). The battery receiving space (100S) may be covered by an end plate (130) positioned at the front and rear of the module case body (110). More specifically, at least a portion of the battery receiving space (100S) may be covered by a busbar frame (210) positioned on the side facing the battery receiving space (100S) with respect to the end plate (130), and the end plate (130) may cover the battery receiving space (100S) together with the busbar frame (210).

[0078] In the secondary battery (B) described below, electricity formed in the electrode can be moved toward the electrode lead (12) through the electrode tab (11). In order to control the electricity emitted from each electrode lead (12) of the plurality of secondary batteries (B), the end of each electrode lead (12) can be in contact with a bus bar (200). A plurality of bus bars (200) can be provided to correspond to each electrode lead (12). The bus bar (200) can be, for example, a metal plate having a plate shape. The thickness of the electrode lead (12) can be thinner than the bus bar (200), and accordingly, the movement of the electrode lead (12) is not fixed, so that it may not be easy to control. When the electrode lead (12) contacts the bus bar (200), and the electricity moved through the electrode lead (12) flows through the bus bar (200), a component requiring electricity can be supplied with electricity by contacting the bus bar (200). Since the bus bar (200) may have a thickness thicker than the electrode lead (12), an electrical connection can be easily implemented than when electricity is directly connected to the electrode lead (12). The bus bar (200) may be mounted and fixed to the bus bar frame (210). The bus bar (200) may be coupled to the bus bar frame (210) by a force-fit. However, the present invention is not limited thereto, and it is considered that the idea of ​​the present invention can be applied to a case where the bus bar (200) is coupled to the bus bar frame (210) by a fastening member or by an adhesive. Some of the plurality of bus bars (200) may be configured to be exposed to the outside of the end plate (130) described below so that a component requiring electricity can be easily connected to the bus bar (200).

[0079] A battery module (BM) may include a plurality of secondary batteries (B), and the plurality of secondary batteries (B) may have different voltages during operation. The plurality of secondary batteries (B) must have the same voltage so that each charge state can be maintained the same, and thus, the plurality of secondary batteries (B) can be charged the same way. That is, if the voltage of some of the plurality of secondary batteries (B) is significantly lower than that of other secondary batteries (B), a problem may arise in that all of the plurality of secondary batteries (B) must be charged. In this case, charging may be required even if the plurality of secondary batteries (B) do not use all of their original battery energy, which may cause a problem in that the charge capacity appears to be lower than the actual capacity. Furthermore, if the voltage of the plurality of secondary batteries (B) exceeds a preset value, it may be recognized as a signal that a side reaction has occurred in some of the plurality of secondary batteries (B). Therefore, it may be necessary to monitor the voltages of the plurality of secondary batteries (B).

[0080] To this end, the battery module (BM) may include a substrate (220) configured to be in contact with a bus bar (200) through which electricity of a plurality of secondary batteries (B) flows, and a connector (230) may be mounted on the substrate (220), such that the connector (230) may be connected to a battery management system (BMS) configured to monitor the voltage of the secondary batteries (B). The BMS may be electrically connected to the connector (230), and information about the voltage received by the substrate (220) in contact with the bus bar (200) may be transmitted to the BMS through the connector (230) to receive information about the voltage of the secondary batteries (B). The BMS may control each of the plurality of secondary batteries (B) so that each of the plurality of secondary batteries (B) has a voltage within a preset range based on the voltage information about each of the plurality of secondary batteries (B).

[0081] Below, the secondary battery (B) included in the battery module (BM) is described in more detail.

[0082] A secondary battery (B) may be configured to generate electrical energy. The secondary battery (B) may include an electrode assembly (10). The electrode assembly (10) may be formed by alternately stacking electrodes (not shown) and separators (not shown). First, a slurry containing an electrode active material, a binder, and a plasticizer may be applied to a positive electrode current collector and a negative electrode current collector to manufacture electrodes such as a positive electrode and a negative electrode. Then, separators may be stacked between the electrodes to form an electrode assembly (10), and the electrode assembly (10) may be inserted into a battery case (20) (not shown), and an electrolyte (not shown) may be applied thereto, followed by sealing.

[0083] Specifically, the electrode assembly (10) may include two types of electrodes, a positive electrode and a negative electrode, and a separator interposed between the electrodes to mutually insulate the electrodes. This electrode assembly (10) may be provided in a stack type, a jelly roll type, a stack and folding type, etc., depending on the way in which the positive electrode, the negative electrode, and the separator are stacked. The two types of electrodes, i.e., the positive electrode and the negative electrode, may each have a structure in which an active material slurry is applied to an electrode current collector in the form of a metal foil or metal mesh containing aluminum and copper, respectively. The slurry may typically be formed by stirring a granular active material, an auxiliary conductor, a binder, a plasticizer, etc. in a state in which a solvent is added. The solvent in the slurry may be removed in a subsequent process.

[0084] More specifically, the positive electrode may include a positive electrode material with a strong oxidizing ability that provides electrons. For example, the positive electrode material may include lithium ions, a transition metal, and oxygen. Nickel, cobalt, or manganese may be used as the transition metal. The negative electrode may include a negative electrode material with a strong reducing ability that accepts electrons. For example, the negative electrode material may include graphite. When the secondary battery (B) is charged and discharged, electrons may move according to the movement of lithium ions. In this case, lithium ions may move through an electrolyte (see Figure 7) located between the positive electrode and the negative electrode, and electrons may move through a conductor connecting the positive electrode and the negative electrode.

[0085] The electrode tabs (11) are connected to the positive and negative electrodes of the electrode assembly (10), respectively, and protrude outward from the electrode assembly (10) to serve as a path through which electrons can move between the inside and the outside of the electrode assembly (10). The plurality of electrode tabs (11) may protrude in different directions of the electrode assembly (10), as illustrated in FIG. 3, but are not limited thereto, and the plurality of electrode tabs (11) may protrude in parallel in the same direction or in various directions.

[0086] An electrode lead (12) that supplies electricity to the outside of the secondary battery (B) by being connected to the electrode tab (11) may be provided. The electrode lead (12) may be connected to the electrode tab (11) by spot welding, etc.

[0087] An insulating portion (13) surrounding a portion of the electrode lead (12) may be provided. The insulating portion (13) may be positioned to correspond to a position where the side portion (22) described below is fused. When the side portions (22) are fused to each other, the insulating portion (13) may be positioned between the side portions (22) to adhere the electrode lead (12) to the pouch. In addition, the insulating portion (13) may prevent electricity generated from the electrode assembly (10) from flowing to the pouch through the electrode lead (12) and maintain the sealing of the pouch. Therefore, the insulating portion (13) may be made of a non-conductive material that does not conduct electricity well. For example, the insulating portion (13) may be an insulating tape that is easy to attach to the electrode lead (12) and has a relatively thin thickness. However, the present invention is not limited thereto, and various materials may be used as long as they can insulate the electrode lead (12).

[0088] The pouch can be manufactured from a highly flexible material to accommodate the electrode assembly (10) therein. When a flexible pouch film is drawn and formed using a punch (not shown) or the like, a portion thereof is stretched to form a receiving portion (21) having a pocket-shaped electrode receiving space (20S), thereby manufacturing the pouch. The pouch can accommodate and seal the electrode assembly (10) so that a portion of the electrode lead (12) is exposed. For reference, in this document, the pouch is mentioned as an example of a battery case (20), and therefore, the terms pouch, pouch film, and battery case (20) may have substantially the same meaning.

[0089] A side portion (22) may be provided surrounding the receiving portion (21). The side portion (22) may extend from the edge of the receiving portion (21) toward the outside of the receiving portion (21). When two receiving portions (21) are provided, a folding portion (25) positioned between the two receiving portions (21) may be provided. The folding portion (25) may be folded based on an imaginary line positioned on the folding portion (25), so that the two receiving portions (21) may be positioned so that they correspond to each other. In addition, the corresponding side portions (22) may thereby contact each other. At this time, each part of the side portions (22) that meet each other may be a sealant layer described later.

[0090] The pouch film may include multiple layers. The pouch film may include a sealant layer, a barrier layer, and / or a surface protection layer. The sealant layer, the barrier layer, and the surface protection layer may be laminated in that order. At this time, the sealant layer may have a polymer material. For example, the sealant layer may have a polypropylene material. The barrier layer may have a metal material. For example, the barrier layer may have an aluminum material. The surface protection layer may have a polymer material. For example, the surface protection layer may have a nylon material.

[0091] As previously mentioned, the side portions (22) that are in contact with each other can be positioned so that their sealant layers are in contact with each other. At this time, when heat and pressure are applied to the side portions (22) that are in contact with each other, the sealant layers of each of the side layers that are in contact with each other are fused, so that the side portions (22) can be sealed.

[0092] The side portion (22) may include a lead sealing portion (23) positioned adjacent to the electrode lead (12). The side portion (22) may include a degas sealing portion (24) extending in a direction different from the extension direction of the lead sealing portion (23). The pouch film of the secondary battery (B) may be formed by folding the folding portion (25), and then sealing both lead sealing portions (23) by fusion. After the lead sealing portions (23) are fused to each other, a degassing process, which is a process of removing gas remaining in the degas sealing portion (24), may be performed, and a trimming process, which cuts off unnecessary portions so that the degas sealing portion (24) has a predetermined width, may be performed. After the trimming process, the degas sealing portion (24) may have a predetermined width. A portion of the degas sealing portion (24) can be folded to form a side folding portion (25). This is because the energy density per unit volume increases when the width of the degas sealing portion (24) is reduced. In particular, the degas sealing portion (24) illustrated in FIG. 3 can be trimmed to shorten its length and folded to form one component of a completed secondary battery (B).

[0093] These secondary batteries (B) can produce electrical energy through chemical reactions involving the surrounding components, including the aforementioned electrodes. However, unintended side reactions can occur during this process, and these side reactions can, in extreme cases, generate flames. While preventing side reactions is ideal, if a side reaction has already occurred and generated a flame, it may be necessary to prevent the flames from spreading to the surroundings. Below, one embodiment of the present invention that achieves this goal is described.

[0094] Fig. 4 is a rear perspective view illustrating the end plate (130) of the battery module (BM) illustrated in Fig. 2 and its surrounding configuration. Fig. 5 is a front perspective view of the end plate (130) illustrated in Fig. 4. Fig. 6 is an enlarged perspective view of section VI of the end plate (130) illustrated in Fig. 5. Fig. 7 is a cross-sectional view illustrating the battery module (BM) illustrated in Fig. 1 taken along section VII-VII'. Fig. 8 is an enlarged cross-sectional view of section VIII of the battery module (BM) illustrated in Fig. 7.

[0095] Referring to FIGS. 4 to 8, a battery module (BM) according to the first embodiment of the present invention will be further described.

[0096] As illustrated in FIG. 5, an end plate (130) may be provided. The end plate (130) may include a mesh portion (300). Since the end plate (130) may be a component of the module case (100), it may be said that the module case (100) may include a mesh portion (300) having a mesh shape. Accordingly, for example, it may be said that the mesh portion (300) is formed in the module case body (110) described below with reference to FIGS. 9 and 10, and it may be said that the mesh portion (300) is formed in the module cover (120).

[0097] In particular, since the module case (100) is located at the outermost side of the battery module (BM), it is also the part located closest to the adjacent battery module (BM), so if a refractory paint layer (400) described later is formed on the module case (100), heat transfer to the adjacent battery module (BM) can be effectively prevented.

[0098] Furthermore, the module case (100) may have a metal material for rigidity, whereby the module case (100) is less likely to change shape even at high temperatures, allowing the refractory paint layer (400) described later to function in its proper position. For example, the busbar frame (210) in the seventh embodiment described with reference to FIG. 22 often has a plastic material because its required rigidity is lower than that of the module case (100). However, since plastic may melt at high temperatures and change shape, it may be difficult to properly accommodate the refractory paint layer (400). In contrast, the module case (100) can sufficiently accommodate the refractory paint layer (400) even at high temperatures.

[0099] At this time, the mesh shape may be formed by forming a mesh hole (300H), or may be formed by having a convex or concave shape. The mesh shape may be defined as a shape with a larger surface area compared to when the mesh shape is not formed.

[0100] And, as a refractory paint layer (400) applied to the mesh portion (300), a refractory paint layer (400) that foams due to heat above a predetermined temperature may be provided. That is, the battery module (BM) may include a refractory paint layer (400) that foams based on heat above a predetermined temperature. The refractory paint layer (400) may have a material that expands in volume by foaming approximately 10 to 100 times when heat is applied. For example, the refractory paint layer (400) may include a material such as ammonium phosphate and may foam at approximately 250°C. Alternatively, the refractory paint layer (400) may include an epoxy material. The temperature at which the refractory paint layer (400) starts foaming may vary depending on the material of the refractory paint layer (400). Since the battery module (BM) includes a refractory paint layer (400), when ignition occurs in some of the plurality of secondary batteries (B), the refractory paint layer (400) may reach a temperature higher than a certain temperature due to the ignition, causing the refractory paint layer (400) to foam. When the refractory paint layer (400) foams, high heat inside the battery module (BM) can be prevented from being transferred to the outside of the battery module (BM). Furthermore, the refractory paint layer (400) blocks oxygen, thereby preventing oxygen from flowing into the inside of the battery module (BM), thereby minimizing the growth of a flame.

[0101] When the above-described refractory paint layer (400) is applied to a mesh portion (300) with a large surface area, more refractory paint can be applied. Therefore, flame growth can be prevented more effectively.

[0102] At this time, since the flame may be generated from the inside of the battery module (BM) and may try to move toward the outside, in order to effectively prevent the flame from spreading, the fire-resistant paint layer (400) may be applied to the side of the battery case (20) facing the secondary battery (B). Since the mesh portion (300) may be configured to allow a larger amount of the fire-resistant paint layer (400) to be applied, the mesh portion (300) may be provided on the side of the battery case (20) facing the secondary battery (B). This means that the fire-resistant paint layer (400) and the mesh portion (300) may be formed on the side of the battery case (20) facing the secondary battery (B), but it does not mean that the fire-resistant paint layer (400) and the mesh portion (300) are formed only on the side of the battery case (20) facing the secondary battery (B) and are not formed on other parts.

[0103] The mesh portion (300) may be formed with a plurality of mesh holes (300H) arranged at a predetermined interval. When the mesh portion (300) is formed by forming a plurality of mesh holes (300H), the mesh portion (300) can be formed simply by forming the mesh holes (300H), thereby facilitating the process. Here, the shape of the hole may have a circular shape, as illustrated in FIG. 6. Furthermore, when the mesh portion (300) is formed through the mesh holes (300H), the entire surface including each opening of the mesh holes (300H) may become the mesh portion (300). As illustrated in FIG. 5, by forming the mesh holes (300H), the mesh portion (300) may be formed on both the front and rear of the end plate (130).

[0104] At this time, as illustrated in FIG. 5, the end plate (130) may include a first mesh portion (300a) facing the electrode lead (12). And, the refractory paint layer (400) applied to the first mesh portion (300a) may be defined as a first refractory paint layer (400a). The first refractory paint layer (400a) may be applied to the surface of the first mesh portion (300a) facing the electrode lead (12). When the refractory paint layer (400) is applied to the end plate (130), it can most effectively prevent the propagation of flame. This is because the end plate (130) faces the electrode lead (12). More specifically, this is because the end plate (130) faces the lead sealing portion (23) of the battery case (20). As illustrated in FIG. 2, the battery case (20) may have corners in the front-back direction and the up-down direction, excluding the left-right direction, which is the stacking direction. Looking at the up-down direction of the battery case (20), the folding part (25) located on the lower side is connected without a fused portion, so it may be difficult to be damaged by tearing, etc. Although the folded degas sealing part (24) located on the upper side has a pouch film fused, the sealing may be difficult to release because both the folding and the fusion must be released through the folding process. On the other hand, the lead sealing part (23) located in the front-back direction is sealed simply by the fusion of the pouch film, and not only did it not undergo a separate folding, but also the part adjacent to the electrode lead (12) is not a part where the pouch films are fused together, but a part where the electrode lead (12) or the insulating part (13) and the pouch film are fused, so that the fusion release may be easier. Therefore, when a side reaction occurs inside the secondary battery (B) and the pressure inside the secondary battery (B) increases, the place where the seal is most easily released may be the lead sealing portion (23).When a flame is generated inside the secondary battery (B) and the sealing of the lead sealing portion (23) is released, the flame can propagate to the outside of the secondary battery (B) through the released lead sealing portion (23). At this time, since the end plate (130) faces the lead sealing portion (23), if a refractory paint layer (400) is applied to the end plate (130), the refractory paint layer (400) can quickly come into contact with the flame emitted from the lead sealing portion (23), thereby quickly preventing the propagation of the flame.

[0105] In particular, as illustrated in FIG. 7, the first mesh portion (300a) of the end plate (130) can be positioned facing the electrode lead (12) at a predetermined distance, in other words, the first mesh portion (300a) can be positioned facing the lead sealing portion (23), so that it can effectively respond to flames emitted along with the release of the seal of the lead sealing portion (23).

[0106] At this time, the mesh holes (300H) can be formed as densely as possible in the end plate (130), as illustrated in FIG. 5. However, as more mesh holes (300H) are formed, the stiffness of the end plate (130) can decrease, so the mesh holes (300H) can be formed so that the stiffness of the end plate (130) exceeds the minimum stiffness standard. Here, the mesh holes (300H) formed in the first mesh portion (300a) can be defined as the first mesh holes (300Ha).

[0107] As illustrated in FIG. 8, the first refractory paint layer (400a) can penetrate the plurality of mesh holes (300H) formed in the first mesh portion (300a). Therefore, the reason why the first mesh portion (300a) increases the surface area on which the refractory paint layer (400) is applied is because the refractory paint layer can fill each of the plurality of mesh holes (300H). Since the first refractory paint layer (400a) is accommodated in each of the plurality of mesh holes (300H), more of the refractory paint layer (400) can be applied to the end plate (130). Furthermore, even if more of the refractory paint layer (400) is applied to the end plate (130), the thickness of the end plate (130) can be prevented from increasing.

[0108] The first refractory paint layer (400a) may also be applied to the opposite side of the first mesh portion (300a) facing the electrode lead (12). In this way, the first refractory paint layer (400a) may be positioned to surround at least a portion of one side of the end plate (130).

[0109] In the above, the case where the refractory paint layer (400) is applied to the end plate (130) has been described. Below, it is described that the refractory paint layer (400) can be applied to other configurations other than the end plate (130).

[0110] Fig. 9 is a perspective view illustrating the module case body (110) illustrated in Fig. 2. Fig. 10 is a cross-sectional view illustrating the battery module (BM) illustrated in Fig. 1 taken along line Ⅹ-Ⅹ'.

[0111] Referring to FIGS. 9 and 10, a battery module (BM) according to the first embodiment of the present invention will be further described.

[0112] The module case body (110) mentioned above may include a side surface so as to form a battery accommodation space (100S) capable of accommodating a secondary battery (B). The module case body (110) may include a second mesh portion (300b) facing the secondary battery (B). A refractory paint layer (400) applied to the second mesh portion (300b) may be defined as a second refractory paint layer (400b). The second refractory paint layer (400b) may be applied to a surface of the second mesh portion (300b) facing the secondary battery (B). The second refractory paint layer (400b) may be provided together with the first refractory paint layer (400a), or only the second refractory paint layer (400b) may be provided without providing the first refractory paint layer (400a). In particular, since the module case body (110) generally has a larger surface area facing the plurality of secondary batteries (B) than the end plate (130), forming a refractory paint layer (400) on the module case body (110) may mean that more refractory paint can be applied to the module case (100).

[0113] The second refractory paint layer (400b) can penetrate through a plurality of mesh holes (300H) formed in the second mesh portion (300b). Since the second refractory paint layer (400b) is accommodated in each of the plurality of mesh holes (300H), a larger amount of the refractory paint layer (400) can be applied to the module case body (110). Furthermore, even if a larger amount of the refractory paint layer (400) is applied to the module case body (110), an increase in the thickness of the module case body (110) can be prevented.

[0114] For reference, the mesh hole (300H) formed in the second mesh portion (300b) can be defined as a second mesh hole (300Hb).

[0115] The second refractory paint layer (400b) may also be applied to the opposite side of the second mesh portion (300b) facing the secondary battery (B). Accordingly, the second refractory paint layer (400b) may be positioned to surround at least a portion of one side of the module case body (110).

[0116] In particular, the second mesh portion (300b) may be provided on the side of the module case body (110). As shown below, a vent hole (120H) may be formed in the module cover (120). When a side reaction occurs in the secondary battery (B), the pressure increases, and the increased pressure can be relieved or the generated flame can be guided to a certain location and managed by being treated there. The gas and / or flame can be guided to be discharged through the vent hole (120H) formed in the module cover (120). In particular, since the module cover (120) is configured to be located on the upper side of the battery module (BM), the nature of the flame is directed upward, and although the generated gas varies depending on the type, if it is lighter than air, it moves upward, so inducing the gas and / or flame through the module cover (120) may be appropriate for inducing most gases and / or flames. In the process of moving gas or flame, it is more likely to move along the side of the module frame body rather than the bottom, so it may be effective for the second refractory paint layer (400b) to be formed on the side of the module frame body.

[0117] An insulating sheet (111) positioned between the secondary battery (B) and the lower surface of the module case body (110) may be further included. Accordingly, the lower surface of the module case body (110) may be covered with the insulating sheet (111). Accordingly, furthermore, since the lower surface of the module case body (110) can prevent the propagation of flame by the insulating sheet (111), the need for a second fire-resistant paint layer (400b) may be reduced compared to the side surface of the module case body (110).

[0118] As mentioned above, the module cover (120) configured to cover the battery receiving space (100S) may further include a module cover (120) having a vent hole (120H) formed therein. In addition, the fire-resistant paint layer (400) may not be applied to the module cover (120). A plurality of battery modules (BM) may generally be arranged in the front-rear, left-right directions rather than being stacked vertically to form a battery pack (BP). Therefore, discharging gas or flames to the upper side of a battery module (BM) may have less of an impact on the neighboring battery modules (BM). Furthermore, since another battery module (BM) may not be provided on the upper side of a battery module (BM), relatively less insulation may be required to reduce the impact on the other battery modules (BM). Therefore, the second fire-resistant paint layer (400b) may not be applied to the module cover (120) located on the upper side of the battery module (BM). Since forming a refractory paint layer (400) involves the cost of using a raw material called refractory paint and the cost of the process for applying the raw material, not forming the refractory paint layer (400) can lead to a reduction in the cost of producing a battery module (BM).

[0119] However, despite this explanation, it goes without saying that a second refractory paint layer (400b) may be applied to the lower surface of the module case body (110) and / or the module cover (120) to enhance the insulation effect.

[0120] Fig. 11 is a conceptual diagram illustrating that a side reaction occurs in the secondary battery (B) of the battery module (BM) illustrated in Fig. 7. Fig. 12 is a conceptual diagram illustrating that a fire-resistant paint layer (400) is foamed as a flame or the like propagates in the secondary battery (B) illustrated in Fig. 11.

[0121] Referring to FIGS. 11 and 12, a case in which a flame propagates in a battery module (BM) according to the first embodiment of the present invention will be described.

[0122] As illustrated in Fig. 11, when a side reaction occurs in the secondary battery (B), the lead sealing portion (23) is likely to be released from the sealing. When the sealing of the lead sealing portion (23) is released, high-temperature gas and / or flame may move between the released lead sealing portions (23). The moved high-temperature gas and / or flame may move along the extension direction of the electrode lead (12) through the lead sealing portion (23).

[0123] As illustrated in FIG. 12, the moving high-temperature gas and / or flame may encounter the first refractory paint layer (400a). When the first refractory paint layer (400a) thereby reaches a predetermined temperature, the first refractory paint layer (400a) may be foamed. The first refractory paint layer (400a) may have a larger volume after foaming than before foaming. The foamed first refractory paint layer (400a) may prevent the flame from spreading to the adjacent battery module (BM) and insulate heat generated inside the battery module (BM).

[0124] Furthermore, when the temperature inside the battery module (BM) increases or the flame propagates further, the temperature of the second refractory paint layer (400b) increases, and thus the second refractory paint layer (400b) may foam.

[0125] The configuration of the battery module (BM) related to the refractory paint layer (400) has been described above. Below, the method for forming the refractory paint layer (400) will be described.

[0126] Fig. 13 is a conceptual diagram illustrating the end plate (130) illustrated in Fig. 5 accommodated within an injection device (IA). Fig. 14 is a conceptual diagram illustrating an injection product coupled to the end plate (130) illustrated in Fig. 13. Fig. 15 is a conceptual diagram illustrating the end plate (130) illustrated in Fig. 14 separated from the injection device (IA).

[0127] Referring to FIGS. 13 to 15, a method for forming a refractory paint layer (400) according to a first embodiment of the present invention will be described. In particular, FIGS. 13 to 15 illustrate a case where a first refractory paint layer (400a) is applied to an end plate (130), but this method can also be applied to a case where a second refractory paint layer (400b) is applied to a module case body (110), and further, it can be applied to any method for forming a refractory paint layer (400), regardless of type.

[0128] As shown in Fig. 13, the end plate (130) can be accommodated in the injection device (IA).

[0129] The injection device (IA) may include a first injection device part (IAa) and a second injection device part (IAb) that is different from the first injection device part (IAa). The first injection device part (IAa) and the second injection device part (IAb) may cover opposite sides of the end plate (130), respectively.

[0130] An injection hole (IAH) may be formed in the injection device (IA). The injection hole (IAH) may extend from the outside of the injection device (IA) to the end plate (130). The refractory paint may be moved toward the end plate (130) through the injection hole (IAH).

[0131] As illustrated in FIG. 14, the refractory paint may be moved to the first mesh portion (300a) of the end plate (130) to form a first refractory paint layer (400a). That is, the first refractory paint layer (400a) may be applied to the end plate (130) by injection molding. Furthermore, the refractory paint layer (400) may be applied to the module case (100) by injection molding. More specifically, the refractory paint layer (400) may be applied to the module case (100) by a low-temperature injection molding method.

[0132] As illustrated in FIG. 15, the first injection device part (IAa) and the second injection device part (IAb) are moved away from each other, and the end plate (130) to which the refractory paint layer (400) is applied can be separated from the injection device (IA).

[0133] FIG. 16 is an exploded view showing a battery pack (BP) including the battery module (BM) illustrated in FIG. 1.

[0134] Referring to FIG. 16, a battery pack (BP) according to a first embodiment of the present invention is described.

[0135] As illustrated in FIG. 16, a plurality of battery modules (BM) may form a battery pack (BP). The battery pack (BP) may include a pack case (900) configured to accommodate the battery modules (BM). A pack case body (910) included in the pack case (900) accommodates the battery modules (BM), and a pack cover (920) included in the pack case (900) covers the pack case body (910) and thus may cover the battery modules (BM).

[0136] At this time, since the plurality of battery modules (BM) can be positioned close together within the pack case (900), if a flame is emitted from a part of the plurality of battery modules (BM), the flame can spread to an adjacent battery module (BM), so that the present invention described above can be effectively applied.

[0137] Below, embodiments different from the first embodiment are described. Commonalities with the first embodiment will be omitted as much as possible, and the other embodiments will be described focusing on differences. In other words, it should be clear that any details not described in the other embodiments can be supplemented by the first embodiment.

[0138] Second Example

[0139] Fig. 17 is an enlarged view of a mesh portion (300) according to the second embodiment of the present invention.

[0140] Referring to FIG. 17, a mesh portion (300-1) according to a second embodiment of the present invention will be described. The mesh portion (300-1) illustrated in FIG. 17 may be defined as a first mesh portion (300a) and / or a second mesh portion (300b). The description of the mesh portion (300) in other embodiments below may be applied as is to the first mesh portion (300a) and / or the second mesh portion (300b) as in the second embodiment. Furthermore, although not mentioned in the description of the second embodiment, the refractory paint layer (400) mentioned in the description of other embodiments below may be applied as is to the first refractory paint layer (400a) and / or the second refractory paint layer.

[0141] The second embodiment differs from the first embodiment in that the shape of the mesh hole (300H-1) is different. The mesh hole (300H-1) formed in the mesh portion (300-1) in the second embodiment may have a shape with a hexagonal cross-section.

[0142] Third Example

[0143] Fig. 18 is an enlarged view of a mesh portion (300-2) according to a third embodiment of the present invention.

[0144] Referring to Fig. 18, a mesh portion (300-2) according to a third embodiment of the present invention is described.

[0145] The third embodiment differs from the first embodiment in that the shape of the mesh hole (300H-2) is different. The mesh hole (300H-2) formed in the mesh portion (300-2) in the third embodiment may have a shape with a rectangular cross-section.

[0146] Since the mesh holes (300H-1, 300H-2) in the second and / or third embodiments have a polygonal cross-section, they can be formed by connecting a member such as a wire extending in one direction, in addition to making a hole by punching, etc. For example, the mesh portions (300-1, 300-2) of the second and / or third embodiments can be formed by weaving wires to create a net.

[0147] Example 4

[0148] Fig. 19 is a cross-sectional view of a mesh portion (300-3) according to the fourth embodiment of the present invention.

[0149] Referring to FIG. 19, a mesh portion (300-3) according to a fourth embodiment of the present invention is described.

[0150] The fourth embodiment differs from the first embodiment in that the mesh hole (300H-3) is not formed to completely penetrate the mesh portion (300-3). The mesh hole (300H-3) may extend from one side of the mesh portion (300-3) facing the secondary battery (B) until it penetrates the other side. The mesh hole (300H-3) may extend from the side facing the secondary battery (B), as illustrated in FIG. 19. This increases the cross-sectional area of ​​the mesh portion (300-3) facing the secondary battery (B), allowing more refractory material to be applied to the side facing the secondary battery (B).

[0151] However, without being limited thereto, the mesh hole (300H-3) may extend from the opposite side of one side of the mesh portion (300-3) facing the secondary battery (B).

[0152] In other words, the mesh portion (300-3) may include a convex portion (320-3) and a concave portion (310-3). The concave portion (310-3) may form a mesh hole (300H-3) having a groove shape. The convex portions (320-3) and the concave portions (310-3) may be provided in multiple numbers to have a certain pattern. The convex portion (320-3) may protrude toward the secondary battery (B), and the concave portion (310-3) may be positioned adjacent to the convex portion (320-3) and may be sunk in a direction opposite to the protrusion direction of the convex portion (320-3).

[0153] Example 5

[0154] Figure 20 is a cross-sectional view of a mesh portion (300) and its surrounding structure according to the fifth embodiment of the present invention.

[0155] Referring to FIG. 20, the mesh portion (300) and the refractory paint layer (400-4) according to the fifth embodiment of the present invention are described.

[0156] The fifth embodiment differs from the first embodiment in that the refractory paint layer (400-4) is applied only to one side of the mesh portion (300). More specifically, the refractory paint layer (400-4) may be applied only to the side of the mesh portion (300) facing the secondary battery (B). At this time, the refractory paint layer (400-4) may be configured to completely fill the mesh hole (300H), as illustrated in FIG. 20, or may be configured to partially fill the mesh hole (300H). Furthermore, without being limited thereto, the refractory paint layer (400-4) may not fill the mesh hole (300H). Accordingly, the amount of refractory paint used can be reduced, while effectively preventing thermal runaway diffusion of the secondary battery (B).

[0157] Additionally, unlike as illustrated in FIG. 20, even if the refractory paint layer (400-4) is applied to the opposite side of the side of the mesh portion (300) facing the secondary battery (B), when a side reaction occurs in the secondary battery (B), the high-temperature gas and / or flame generated does not diffuse to the outside of the battery module (BM) by meeting the refractory paint layer (400-4) applied to the mesh portion (300), which is similar to the case where the refractory paint layer (400-4) is applied only to the side of the mesh portion (300) facing the secondary battery (B), and therefore, this idea is also considered to be included in the idea of ​​the present invention.

[0158] Example 6

[0159] Fig. 21 is a cross-sectional view of a battery module (BM) according to the sixth embodiment of the present invention.

[0160] Referring to FIG. 21, a refractory paint layer (400) according to the sixth embodiment of the present invention is described.

[0161] The sixth embodiment differs from the first embodiment in that the refractory paint layer (400) can be applied to the lower surface of the module case body (110) and / or the module cover (120).

[0162] More specifically, the refractory paint layer (400) may include a third refractory paint layer (400c-5) applied to the inner lower surface of the module case body (110). In this case, the insulating sheet (111) of the first embodiment may not be required. The third refractory paint layer (400c-5) may be connected to the second refractory paint layer (400b). When the refractory paint layer (400) is applied to the module case (100) by injection molding the module case body (110), the second refractory paint layer (400b) and the third refractory paint layer (400c-5) may be formed at once.

[0163] Furthermore, the refractory paint layer (400) may include a fourth refractory paint layer (400d-5) applied to the surface of the module cover (120) facing the secondary battery (B). When the refractory paint layer (400) includes the first refractory paint layer (400a), the second refractory paint layer (400b), the third refractory paint layer (400c-5), and the fourth refractory paint layer (400d-5), all six sides of an imaginary rectangular solid surrounding the secondary battery (B) may be surrounded by the refractory paint layer (400). Therefore, when a side reaction occurs in the secondary battery (B), it may become more difficult for high-temperature gas and / or flame generated in the secondary battery (B) to propagate to the adjacent battery module (BM).

[0164] Example 7

[0165] Fig. 22 is a rear perspective view of a busbar frame (210) according to the seventh embodiment of the present invention.

[0166] Referring to FIG. 22, a busbar frame (210) and a refractory paint layer (400) applied thereto according to a seventh embodiment of the present invention are described.

[0167] The seventh embodiment differs from the first embodiment in that a fire-resistant paint is applied to the busbar frame (210). While the fire-resistant paint layer (400-6) in the first embodiment was defined as being applied to the module case (100), the fire-resistant paint layer (400-6) in the seventh embodiment can be defined as being able to be applied to the module case (100) and / or the busbar frame (210).

[0168] At this time, the busbar frame (210) is configured to be equipped with the busbar (200) as described above, and can be accommodated within the module case (100). Therefore, if a side reaction occurs in the secondary battery (B) rather than the module case (100), the high-temperature gas and / or flame generated from the secondary battery (B) may reach the busbar frame (210) first. Therefore, when a fire-resistant paint is applied to the busbar frame (210) to form a fire-resistant paint layer (400-6), the flame can be blocked more quickly than in the first embodiment.

[0169] The busbar frame (210) may include a mesh portion (300-6) having a mesh shape. While the mesh portion (300-6) in the first embodiment was defined as a component of the module case (100), the mesh portion (300-6) in the seventh embodiment may be viewed as a component of the battery module (BM), and the busbar frame (210) may also have this component. Accordingly, the mesh portion (300-6) may include a mesh hole (300H-6).

[0170] Accordingly, the refractory paint layer (400-6) is applied to the mesh portion (300-6) and can be foamed by heat above a predetermined temperature.

[0171] The module case (100) may include another mesh portion (300) in a mesh shape.

[0172] The busbar frame (210) may have a polymer material.

[0173] Unless explicitly stated otherwise, the embodiments described above may be combined with other embodiments. Alternatively, combinations between embodiments may be considered possible, unless one embodiment is explicitly restricted from being combined with another embodiment. Combinations of one embodiment with another embodiment are deemed to be disclosed in this document.

[0174] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and various embodiments are possible within the scope equivalent to the technical idea of ​​the present invention and the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

[0175] [Explanation of symbols]

[0176] B: Secondary battery

[0177] 10: Electrode assembly

[0178] 11: Electrode tab

[0179] 12: Electrode leads

[0180] 13: Insulation

[0181] 20: Battery case

[0182] 20S: Electrode receiving space

[0183] 21: Reception area

[0184] 22: Side section

[0185] 23: Lead sealing section

[0186] 24: Digas sealing part

[0187] 25: Folding section

[0188] BM: Battery module

[0189] 100: Module Case

[0190] 100S: Battery storage space

[0191] 110: Module case body

[0192] 111: Insulating sheet

[0193] 120: Module cover

[0194] 120H: Vent hole

[0195] 130 end plate

[0196] 200: Busbar

[0197] 210: Busbar frame

[0198] 220: Substrate

[0199] 230: Connector

[0200] 300: Mesh section

[0201] 300a: 1st mesh section

[0202] 300b: Second mesh section

[0203] 300H: Mesh hole

[0204] 300Ha: 1st mesh hole

[0205] 300Hb: Second mesh hole

[0206] 310-3: Concave

[0207] 320-3: Convex part

[0208] 400: Fireproof paint layer

[0209] 400a: First refractory paint layer

[0210] 400b: Second refractory paint layer

[0211] 400c-5: Third refractory paint layer

[0212] 400d-5: 4th refractory paint layer

[0213] IA: Injection device

[0214] IAH: Injection Hall

[0215] IAa: First injection unit part

[0216] IAb: Second injection unit part

[0217] BP: Battery Pack

[0218] 900: Pack Case

[0219] 910: Pack Case Body

[0220] 920: Pack Cover

Claims

1. A secondary battery including an electrode lead; A module case configured to accommodate the secondary battery, the module case including a mesh portion having a mesh shape; and A battery module including a refractory paint layer applied to the above mesh portion, the refractory paint layer foaming by heat above a predetermined temperature.

2. In paragraph 1, The above mesh portion is a battery module in which a plurality of mesh holes are formed at predetermined intervals.

3. In paragraph 1, The above module case includes an end plate facing the electrode leads, The end plate includes a first mesh portion facing the electrode lead, The refractory paint layer applied to the first mesh portion is defined as a first refractory paint layer, A battery module in which the first refractory paint layer is applied to a surface of the first mesh portion facing the electrode lead.

4. In paragraph 3, A battery module in which the first refractory paint layer penetrates a plurality of mesh holes formed in the first mesh portion.

5. In paragraph 3, A battery module in which the first refractory paint layer is applied to the opposite surface of the first mesh portion toward the electrode lead.

6. In paragraph 2, A battery module in which the plurality of mesh holes have a groove shape.

7. In paragraph 1, The above module case includes a module case body including a side surface so as to form a battery accommodating space capable of accommodating the secondary battery, The above module case body includes a second mesh portion facing the secondary battery, The refractory paint layer applied to the second mesh portion is defined as a second refractory paint layer, A battery module in which the second refractory paint layer is applied to the surface of the second mesh portion facing the secondary battery.

8. In paragraph 7, A battery module in which the second refractory paint layer penetrates a plurality of mesh holes formed in the second mesh portion.

9. In paragraph 7, A battery module in which the second refractory paint layer is applied to the opposite surface of the second mesh portion facing the secondary battery.

10. In paragraph 7, The second mesh portion is a battery module provided on the side of the module case body.

11. In paragraph 7, A battery module further comprising an insulating sheet positioned between the secondary battery and the lower surface of the module case body.

12. In paragraph 7, A battery module further comprising a module cover configured to cover the battery receiving space, wherein a vent hole is formed therein.

13. In paragraph 12, A battery module in which the above refractory paint layer is not applied to the module cover.

14. In paragraph 1, A battery module in which the above refractory paint layer is applied by injection molding to the module case.

15. In paragraph 1, The above module case is a battery module made of metal.

16. Secondary battery including electrode leads; A module case configured to accommodate the secondary battery; A bus bar electrically connected to the above electrode leads; A busbar frame configured to be mounted with the above busbar and accommodated within the module case, the busbar frame including a mesh portion having a mesh shape; and A battery module including a refractory paint layer applied to the above mesh portion, the refractory paint layer foaming by heat above a predetermined temperature.

17. In paragraph 16, The above mesh portion is a battery module in which a plurality of mesh holes are formed at predetermined intervals.

18. In paragraph 16, The above module case is a battery module including another mesh portion in a mesh shape.

19. In Article 16, The above busbar frame is a battery module made of polymer material.

20. Battery module; and Comprising a pack case configured to accommodate a battery module, The above battery module, A secondary battery comprising electrode leads; A module case configured to accommodate the secondary battery, the module case including an end plate facing the electrode lead; and A refractory paint layer applied to the inside of the module case, comprising a refractory paint layer including a first refractory paint layer applied to the end plate, A battery pack wherein the end plate includes a mesh portion having a mesh shape to which the first refractory paint layer is applied.

Images