Battery module

Abstract

A battery module of the present invention includes a battery pack having a plurality of battery cells. The battery module includes: a module case accommodating the battery cells; an end plate coupled to the module case; an air-tight unit coupled to the end plate; and a terminal bus bar inserted into the air-tight unit. The terminal bus bar includes a first end drawn out from the end plate and the air-tight unit and a second end contacting the air-tight unit, and the surface of the second end is formed as a composite layer including a resin.

Description

battery module

[0001] The present invention relates to a battery module.

[0002] Eco-friendly vehicles like electric vehicles (EVs) are equipped with battery modules that charge the power needed to drive the electric motor. These battery modules are often standardized, aiming to share components to achieve slimmer battery modules and lower costs.

[0003] Battery modules are often configured as battery packs by connecting multiple unit battery cells in series to generate high output voltages. Furthermore, battery packs are sometimes configured by connecting multiple battery cells in parallel, depending on the required charge / discharge capacity of the battery pack. Therefore, the number of battery cells included in a battery pack can vary depending on the required output voltage and / or charge / discharge capacity.

[0004] In a battery module and / or battery pack containing multiple battery cells, problems may arise in some of the battery cells. For example, internal pressure may build up, causing internal fluid to leak outward.

[0005] Therefore, it is crucial to prevent leakage of the liquid due to the difficulty in maintaining airtightness in high-temperature / high-pressure environments caused by the internal pressure of these battery cells. Therefore, there is a need to develop a method for providing a battery module and its manufacturing method that can ensure waterproof safety in high-temperature / high-pressure environments to address these issues.

[0006] The present invention aims to solve the above-mentioned problems and other problems.

[0007] The purpose of the present invention is to provide a battery module that can improve airtightness in a high temperature / high pressure environment and prevent leakage of liquid or gas by surface-treating the surface of a terminal busbar.

[0008] And the purpose of the present invention is to provide a method for manufacturing a battery module that can secure bonding tensile strength without compromising the functional characteristics of the material, such as surface contact resistance or allowable current, and simplifying the component manufacturing process by surface-treating a terminal busbar.

[0009] According to one aspect of the present invention, a battery module includes a battery pack having a plurality of battery cells, the battery module including a module case accommodating the battery cells, an end plate coupled to the module case, a sealing unit coupled to the end plate, and a terminal busbar inserted into the sealing unit.

[0010] Here, the terminal busbar includes a first end drawn from the end plate and the airtight unit and a second end in contact with the airtight unit.

[0011] And, the surface of the second stage is formed of a composite layer containing resin.

[0012] The above-mentioned confidential unit includes a cylindrical portion coupled to a penetration portion of the end plate and a cover portion covering one end of the cylindrical portion, and the cylindrical portion may have an insert hole into which the terminal bus bar is inserted.

[0013] The above-mentioned confidential unit may include a protrusion that is in close contact with the sealing groove of the end plate, a first cylindrical portion extended to the end plate, and a second cylindrical portion arranged inside the end plate.

[0014] Here, the insert hole may include a first region arranged in the first cylindrical portion and a second region arranged in the second cylindrical portion.

[0015] The above cover part may have a fastening projection that is in close contact with the second cylindrical part, and the second cylindrical part may have a fastening groove that is fastened to the fastening projection.

[0016] Here, the above-mentioned fastening groove may be placed in a cover area covering the second area.

[0017] The above-mentioned confidential unit may include an injection contact portion formed on a surface of the body of the confidential unit defining the insert hole.

[0018] The above injection contact portion can be in close contact with the terminal busbar.

[0019] The second stage may include a composite part that is in close contact with the confidential unit and a metal base layer disposed below the composite part.

[0020] Here, the surface of the composite part may include a contact surface that is in close contact with the confidential unit.

[0021] The above composite part includes metal thorns formed by protruding in relief on the metal base layer, and the resin can be placed in micro-spaces formed between the metal thorns.

[0022] The above contact surface may be arranged with the above resin or the above resin and a metal thorn.

[0023] The above first stage can be formed of the same material as the metal base layer.

[0024] The above terminal busbar further includes a third end exposed from the second cylindrical portion,

[0025] The above third stage can be formed with the metal base layer.

[0026] The effects of the battery module according to the present invention are described as follows.

[0027] According to at least one of the embodiments of the present invention, the battery module can improve airtightness in a high temperature / high pressure environment and prevent leakage of liquid or gas by surface-treating the surface of the terminal busbar.

[0028] According to at least one of the embodiments of the present invention, the battery module can secure bonding tensile strength by surface-treating the terminal busbar, thereby simplifying the component manufacturing process and not impairing functional characteristics such as surface contact resistance or allowable current of the material.

[0029] Further scope of the applicability of the present invention will become apparent from the detailed description below. However, since various modifications and variations within the spirit and scope of the present invention will become apparent to those skilled in the art, it should be understood that the detailed description and specific examples, such as preferred embodiments of the present invention, are given by way of example only.

[0030] FIG. 1 is a perspective view of a battery module according to one embodiment of the present invention.

[0031] Figure 2 is an enlarged perspective view of area A of Figure 1.

[0032] Figure 3 is an enlarged plan view of area B of Figure 1.

[0033] Figure 4 is a cross-sectional view of a battery module according to an embodiment of the present invention.

[0034] Figure 5 is an enlarged cross-sectional view of area C of Figure 4.

[0035] Figure 6 is a cross-sectional view illustrating a confidential unit according to the present invention.

[0036] Figure 7 is a cross-sectional view of a terminal busbar according to the present invention.

[0037] Figures 8 to 10 are process diagrams illustrating a method of forming a second stage according to an embodiment of the present invention.

[0038] FIG. 11 is a perspective view illustrating a confidential unit according to another embodiment of the present invention.

[0039] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or similar components will be given the same reference numbers, and redundant descriptions thereof will be omitted. The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably only for the convenience of writing the specification, and do not in themselves have distinct meanings or roles. In addition, when describing the embodiments disclosed in this specification, if it is determined that a specific description of a related known technology may obscure the gist of the embodiments disclosed in this specification, a detailed description thereof will be omitted. In addition, the attached drawings are only intended to facilitate easy understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention.

[0040] Terms that include ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by these terms. These terms are used solely to distinguish one component from another.

[0041] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0042] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0043] In this application, terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0044] For convenience of explanation, the sizes of components in the drawings may be exaggerated or reduced. For example, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the present invention is not necessarily limited to what is shown.

[0045] In some embodiments, where implementations are otherwise feasible, specific process sequences may be performed in a different order than described. For example, two processes described in succession may be performed substantially simultaneously, or in a reverse order from the described order.

[0046] In the following examples, when it is said that a film, region, component, etc. are connected, it includes not only cases where the films, regions, and components are directly connected, but also cases where other films, regions, and components are interposed between the films, regions, and components and thus indirectly connected. For example, when it is said in this specification that a film, region, component, etc. are electrically connected, it includes not only cases where the films, regions, and components are directly electrically connected, but also cases where other films, regions, and components are interposed between them and thus indirectly electrically connected.

[0047] Below, the drawings are provided and explained in detail.

[0048] FIG. 1 is a perspective view of a battery module according to one embodiment of the present invention, FIG. 2 is an enlarged perspective view of area A of FIG. 1, and FIG. 3 is an enlarged plan view of area B of FIG. 1.

[0049] Referring to FIGS. 1 to 3, a battery module (10) according to one embodiment of the present invention may include a module case (200).

[0050] The module case (200) can be arranged in a container shape. The module case (200) can have a receiving space formed due to its container shape. A plurality of battery cells (100) can be received in the receiving space.

[0051] A battery cell (100) can be connected to form a battery pack by connecting a single or multiple battery cells (100). In addition, a battery module (100) can be formed by placing a single or multiple battery packs in the receiving area.

[0052] The above battery pack can be formed by arranging a plurality of battery cells (100) accommodated in the receiving area in the X direction. For example, the battery pack is described as being formed by arranging a plurality of battery cells (100) in one direction, but is not limited thereto. The battery pack can also be arranged in a shape in which the battery cells (100) are stacked according to the shape of the receiving area.

[0053] In addition, the battery packs can be arranged in a row in the Y-axis direction. Here, the battery packs can also be arranged in a stacked manner in the Z-axis direction.

[0054] The battery cell (100) can be charged with power required for operation. The battery cell (100) may include an electrode assembly and a storage unit. The storage unit can store the electrode assembly. Furthermore, the storage space of the storage unit may contain an electrolyte solution. The storage unit may be in the shape of a pouch, but is not limited thereto. The electrode assembly may include a positive electrode, a negative electrode, and a separator separating them.

[0055] Referring to FIGS. 1 to 3, a battery module (10) may include a plurality of battery cells (100), a module case (200), an end plate (300), a terminal busbar (400), and a sealing unit (500). Here, a plurality of battery cells (100) may be arranged in the receiving area of ​​the module case (200).

[0056] The module case (200) may be formed in a shape in which at least one side is open. In the drawing, the module case (200) is open in the X-axis direction and an end plate (300) is arranged in the open area, but the present invention is not limited thereto. For another example, the end plate (300) may be arranged in the Z-axis direction of the module case (200), and the end plate (300) may be arranged in both the Z-axis direction and the X-axis direction of the module case (200).

[0057] The end plate (300) can cover one end of the module case (200). The end plate (300) can be coupled to one end side of the module case (200) while covering one end of the module case (200).

[0058] On the end plate (300), a penetration part (330) formed by drilling a hole in the body of the end plate (300) may be arranged. A sealing unit (500) may be arranged in the penetration part (330). At least one penetration part (330) may be arranged on the end plate (300), and the drawing illustrates two penetration parts (330) being arranged, which will be described as an example.

[0059] The airtight unit (500) may include a plurality of openings (550). An insert hole (555) into which a terminal bus bar (400) is inserted may be arranged in at least one of the plurality of openings (550). The plurality of openings (550) other than the insert hole (555) may be used as ventilation windows to discharge heat generated in the battery cell (100) to the outside. Alternatively, they may be used as equipment insertion grooves for coupling the airtight unit (500) to the end plate (300).

[0060] The terminal busbar (400) can be arranged in a structure protruding toward one end of the module case (200).

[0061] The terminal busbar (400) may be arranged so that at least a portion thereof protrudes outside the end plate (300) by penetrating the penetration portion (330). In addition, the terminal busbar (400) may be arranged so as to penetrate the insert hole (555) of the airtight unit (500). In other words, the terminal busbar (400) may be arranged so as to simultaneously penetrate the end plate (300) and the airtight unit (500).

[0062] The terminal busbar (400) may be formed of an electrically conductive material, for example, a conductive metal material such as copper or nickel. The terminal busbar (400) may be positioned so as to be electrically connected to the electrode leads of a plurality of battery cells (100). For example, the terminal busbar (400) may be welded or bolted in direct contact with the electrode leads.

[0063] These terminal busbars (400) can electrically connect between electrode leads or transmit voltage information sensed from the electrode leads to an external control unit, for example, a BMS (Battery Management System).

[0064] FIG. 4 is a cross-sectional view of a battery module according to an embodiment of the present invention, FIG. 5 is an enlarged cross-sectional view of area C of FIG. 4, FIG. 6 is a cross-sectional view showing a sealed unit according to the present invention, and FIG. 7 is a cross-sectional view of a terminal busbar according to the present invention.

[0065] To avoid redundant explanation and for ease of explanation, FIGS. 4 to 7 will be described by citing FIGS. 1 to 3.

[0066] Referring to FIGS. 4 and 5, the airtight unit (500) may be provided at one end of the battery module (10). Specifically, the airtight unit (500) may be placed in the penetration portion (330) of the end plate (300) at one end of the battery module (10).

[0067] The airtight unit (500) can be penetrated by the terminal busbar (400). The airtight unit (500) can be provided in the penetration portion (330) of the end plate (300) through which the terminal busbar (400) penetrates. Accordingly, the airtight unit (500) can effectively prevent high-temperature gas or flame generated within the battery module (10) from being discharged to the outside of the end plate (300) through the penetration portion (330).

[0068] The confidential unit (500) may include a cylindrical portion (510) and a cover portion (580).

[0069] The cylindrical portion (510) can be coupled to the through portion (330) of the end plate (300). Here, the cylindrical portion (510) can include a protrusion (515) protruding from the outer circumferential surface of the cylindrical portion (510).

[0070] The protrusion (515) may be positioned to be in close contact with the body of the end plate (300) adjacent to the through-hole (330) of the end plate (300). The protrusion (515) may improve the airtightness between the end plate (300) and the cylindrical portion (510). Specifically, in order to improve the airtightness between the end plate (300) and the cylindrical portion (510), a sealing groove (350) may be formed around the through-hole (330) of the end plate (300).

[0071] The sealing groove (350) can be arranged to match the shape of the outer diameter of the protrusion (515) and can be formed by recessing a portion of the thickness of the end plate (300).

[0072] In this way, the battery module (10) according to the embodiment of the present invention can improve the airtightness between the airtight unit (500) and the end plate (300) by forming a protrusion (515) in the cylindrical portion (510) and forming a sealing groove (350) on the surface of the end plate (300).

[0073] Referring to FIGS. 5 and 6, the cylindrical portion (510) may include a first cylindrical portion (513) protruding from the end plate (300) based on the protrusion (515) and exposed to the outside of the end plate (300), and a second cylindrical portion (517) arranged on the inside of the end plate (300).

[0074] The first cylindrical portion (513) may protrude from the end plate (300) and have screw threads on its surface. The screw threads may enhance the bonding strength with other components connected to the first cylindrical portion (513). Furthermore, the screw threads may also enhance the airtightness between other components.

[0075] The second cylindrical portion (517) may be placed inside the end plate (300), and a fastening groove may be placed on one end of the second cylindrical portion (517) to be fastened to the cover portion (580).

[0076] The above-mentioned fastening groove can couple the cover part (580) to the second cylindrical part (517). The cover part (580) can further include a fastening projection (519) coupled to the fastening groove. Through the fastening projection (519) coupled to the fastening groove, the cover part (580) can be brought into close contact with the second cylindrical part (517).

[0077] The above-mentioned fastening groove may be arranged in the cover area (CA) of the second cylindrical portion (517) so as to cover one end of the insert hole (555). Here, the insert hole (555) may include a first area (555-1) and a second area (555-2) arranged at one end and the other end. The first area (555-1) may be arranged in the first cylindrical portion (513), and the second area (555-2) may be arranged in the second cylindrical portion (517).

[0078] The cover area (CA) may be arranged on the second cylindrical portion (517) including the second area (555-2) of the insert hole (555). The fastening groove may be arranged on the cover area (CA) so that the cover portion (580) includes the second area (555-2).

[0079] Accordingly, the cover part (580) can seal the second area (555-2) of the insert hole (555) arranged in the second cylindrical part (517), thereby preventing leakage of gas or liquid that may leak out through the insert hole (555) from inside the end plate (300).

[0080] Meanwhile, referring to FIGS. 6 and 7, the airtight unit (500) can reliably seal a micro-gap that may be caused by injection and / or assembly errors in the insert hole (555) through which the terminal busbar (400) penetrates the airtight unit (500).

[0081] The confidential unit (500) can have an insert hole (550) in which a terminal bus bar (400) is placed.

[0082] The confidential unit (500) may include an injection contact surface (525) that forms a boundary between the body of the confidential unit (500) and the insert hole (555). The injection contact surface (525) may be formed on a surface of the body of the confidential unit (500) that defines the insert hole (555).

[0083] As shown in Fig. 5, the injection contact surface (525) can be arranged so that the surface of the terminal bus bar (400) comes into contact with it.

[0084] Here, the terminal busbar (400) may include a second end (420) arranged to contact the injection contact surface (525) and a first end (410) exposed outside the cylindrical portion. Accordingly, the terminal busbar (400) may penetrate the airtight unit (500).

[0085] The first stage (410) can be electrically connected by contacting other components outside the battery module (10). The second stage (420) can improve the airtightness between the insert hole (520) and the terminal busbar (400).

[0086] Here, conventionally, attempts have been made to improve the airtightness between the terminal busbar (400) and the injection contact portion (525) by directly contacting the terminal busbar (400) and the injection contact portion (525) or by applying a curable liquid between the terminal busbar (400) and the injection contact portion (525). However, the method of applying the curable liquid requires additional processes and curing time, which inevitably results in cost and time losses. Furthermore, the method of applying the curable liquid is exposed to the interface peeling phenomenon due to the difference in thermal expansion coefficient in a thermal shock situation, making it difficult to maintain waterproofing or airtightness performance.

[0087] Referring to FIG. 7, the battery module (10) according to the embodiment of the present invention can further include resin (800) on the surface of the second stage (420) to maximize the airtightness between the surface of the terminal busbar (400) and the injection contact portion (525).

[0088] The second stage (420) of the terminal busbar (400) can be in close contact with the injection contact surface (525).

[0089] The first stage (410) can be formed of a metal base layer (400-1).

[0090] The second stage (420) may include a metal base layer (400-1) and a composite layer (450) disposed on the metal base layer (400-1).

[0091] The metal base layer (400-1) may be formed integrally with the first stage (410). It may be formed to have a different thickness from the formation thickness of the metal base layer (400-1). For example, since the metal base layer (400-1) is surface-treated to form a metal branch portion (400-2) that protrudes relatively from the metal base layer (400-1), the formation thickness of the metal base layer (400-1) may be formed to be thinner than the formation thickness of the first stage (410).

[0092] Here, for easy explanation of the second stage (420), FIGS. 8 to 10 are illustrated and described together. FIGS. 8 to 10 are process diagrams illustrating a method of forming the second stage according to an embodiment of the present invention.

[0093] Referring to FIGS. 7 to 10, a metal branch (400-2) and a resin (800) may be placed in the composite layer (450).

[0094] As illustrated in FIGS. 7 and 8, the metal branch (400-2) can be formed in a shape that protrudes in relief from the metal base layer (400-1) by surface-treating the surface of the second stage (420). The metal branch (400-2) can be formed in a shape that protrudes relatively from the metal base layer (400-1).

[0095] Microspaces (MS) can be formed between metal thorns (400-2).

[0096] As illustrated in FIGS. 7 and 9, a resin (800) may be applied to the microcavity (MS). Here, since the resin (800) fills the microcavity (MS), it may be applied to the side and upper surfaces of the metal thorn (400-2). Furthermore, it may also be applied to the metal base layer (400-1).

[0097] As illustrated in FIGS. 7 and 10, a portion of the resin (800) disposed on the metal base layer (400-1) and the metal thorn (400-2) may be removed. Here, the removed resin (890) may be the resin disposed on the upper surface of the metal thorn (400-2).

[0098] Accordingly, the composite layer (450) may include a contact surface (CS) formed of a resin (800) on the surface. Alternatively, the composite layer (450) may have a metal thorn (405-1) arranged on a portion of the contact surface (CS).

[0099] Then, by placing the terminal busbar (400) on which the surface of the composite layer (450) is formed into a mold and injecting the airtight unit (500), the terminal busbar (400) inserted into the airtight unit (500) can be formed.

[0100] The contact surface (CS) of the terminal busbar (400) can contact the injection contact surface (525) of the airtight unit (500) through an injection process. Since the contact surface (CS) that partially includes the resin (800) contacts the injection contact surface (525), the bonding tensile strength between the airtight unit (500) and the terminal busbar (400) can be secured. In other words, the airtightness between the airtight unit (500) and the terminal busbar (400) can be strengthened.

[0101] In this way, the battery module (10) according to the embodiment of the present invention can improve airtightness in a high temperature / high pressure environment and prevent leakage of liquid or gas by surface-treating the surface of the terminal busbar (400).

[0102] Therefore, the battery module (10) according to the embodiment of the present invention can secure bonding tensile strength without simplifying the component manufacturing process and without impairing functional characteristics such as surface contact resistance or allowable current of the material.

[0103] FIG. 11 is a perspective view illustrating a confidential unit according to another embodiment of the present invention.

[0104] To avoid redundant explanation and for easy explanation, Fig. 11 will be described by citing Figs. 1 to 10.

[0105] Referring to FIG. 11, a confidential unit (500-1) according to another embodiment of the present invention may include a cylindrical portion (510-1), a terminal busbar (400), and a cover portion (580). In this drawing, the cover portion (580) is not illustrated for ease of explanation.

[0106] The cylindrical portion (510-1) may have a first cylindrical portion (513-1) exposed to the module case (200) with a protrusion (515) therebetween and a second cylindrical portion (517-1) positioned inside the module case (200). Here, the first cylindrical portion (513-1) and the second cylindrical portion (517-1) are not cylindrical in shape, but may be formed in a cylindrical shape.

[0107] For example, the first cylindrical portion (513-1) may be formed in an oval shape, and the second cylindrical portion (517-1) may be formed in a square shape.

[0108] The second cylindrical portion (517-1) may be provided with a fastening groove that can be coupled to the cover portion. The area covered by the cover portion (800) from the fastening groove may be defined as a cover area (CA). The second cylindrical portion (517-1) positioned in the cover area (CA) may have a portion open to expose the terminal busbar (400).

[0109] In the confidential unit (500-1), a terminal busbar (400) inserted into the interior of the confidential unit (500-1) can be placed.

[0110] The terminal busbar (400) may include a first end (410) protruding from the first cylindrical portion (513-1) and a second end (420) and a third end (420-1) arranged inside the body of the airtight unit (500-1). Here, the second end (420) is as described above and is not shown as it is covered by the airtight unit (500-1).

[0111] The third stage (420-1) may be positioned so as to be exposed from the second cylindrical portion (517-1). For example, the insert hole (555) formed in the airtight unit (500-1) may be formed in a straight line. Here, the terminal busbar (400) may have the first and second stages formed in a straight shape, and the third stage may be formed in a shape that is bent from the second stage. Accordingly, the second stage (420) may be positioned in the insert hole (555) formed in a straight shape.

[0112] The third section (420-1) bent in the second section (420) can be positioned to be exposed in the second cylindrical portion (517-1) because it is not inserted into the insert hole (555). The second cylindrical portion (517-1) is also not formed in some areas so that the third section (420-1) is exposed.

[0113] Accordingly, the composite layer (450) can be formed only on the second stage (420) that contacts the insert hole (555), thereby improving the airtightness between the terminal busbar (400) and the airtight unit (500-1). In other words, the contact surface (CS) between the injection contact surface (525) of the insert hole (555) and the terminal busbar (400) may be formed only on the second stage (420), and not on the third stage (420-1).

[0114] The confidential unit (500-1) and terminal busbar (400) according to another embodiment of the present invention can minimize process efficiency and manufacturing time by reducing the surface treatment area.

[0115] Any or all of the embodiments of the present invention described above are not mutually exclusive or distinct. Any or all of the embodiments of the present invention described above may have their respective components or functions combined or used together.

[0116] It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit and essential characteristics thereof. The above detailed description should not be construed in any way as limiting but rather as illustrative. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the scope of equivalents of the present invention are intended to be included within the scope of the present invention.

[0117] [Explanation of symbols]

[0118] 10: Battery module 100: Battery cell

[0119] 200: Module case 300: End plate

[0120] 330: Penetration 350: Sealing groove

[0121] 400: Terminal busbar 410: First stage

[0122] 420: 2nd stage 400-1: Metal base layer

[0123] 400-2: Metal branch 450: Composite layer

[0124] 500: Confidential unit 510: Cylinder unit

[0125] 513: First cylindrical part 515: Protrusion

[0126] 517: Second cylinder 519: Fastening projection

[0127] 525: Injection contact area 550: Opening area

[0128] 555: Insert hole 555-1: Area 1

[0129] 555-2: Area 2 580: Cover

[0130] CA: Coverage area CS: Contact surface

[0131] MS: Microspace

Claims

1. A battery module including a battery pack having a plurality of battery cells, A module case accommodating the above battery cell; An end plate coupled to the above module case; a sealed unit coupled to the end plate; and A terminal busbar inserted into the above confidential unit; The above terminal busbar, A first stage drawn from the end plate and the confidential unit; and A second stage comprising a second end in contact with the above confidential unit, A battery module, wherein the surface of the second stage is formed of a composite layer containing resin.

2. In paragraph 1, The above confidential unit is, a cylindrical portion coupled to a penetration portion of the above end plate; and A cover part covering one end of the above cylindrical part; including; A battery module, wherein the above cylindrical portion has an insert hole into which the terminal busbar is inserted.

3. In paragraph 2, The above confidential unit is, A protrusion that adheres to the sealing groove of the above end plate; A first cylindrical portion drawn out to the above end plate; Including a second cylindrical portion arranged inside the end plate, The above insert hole is, A first region arranged in the first cylindrical portion; and A battery module, comprising: a second region disposed in the second cylindrical portion; 4. In paragraph 3, The above cover part, It has a fastening projection that is in close contact with the second cylindrical portion. The above second cylindrical portion has a fastening groove that is fastened to the fastening projection, A battery module, wherein the above-mentioned fastening groove is arranged in a cover area covering the second area.

5. In paragraph 2, The above confidential unit is, A battery module, wherein the body of the confidential unit includes an injection-molded contact portion formed on a surface defining the insert hole.

6. In paragraph 5, A battery module in which the above injection contact surface is in close contact with the terminal busbar.

7. In paragraph 1, The second paragraph above is, A composite part that is in close contact with the above confidential unit; and A metal base layer disposed at the lower portion of the above composite part; On the surface of the above composite part A battery module comprising a contact surface that is in close contact with the above-mentioned confidential unit.

8. In paragraph 7, The above composite part, Including metal thorns formed by protruding in relief on the metal base layer; A battery module wherein the resin is placed in micro-spaces formed between the metal thorns.

9. In paragraph 7, The above contact surface is, A battery module in which the resin or the resin and the metal thorn are arranged.

10. In paragraph 7, The above first stage is a battery module formed of the same material as the metal base layer.

11. In paragraph 7, The above terminal busbar, Further including a third stage exposed from the second cylindrical portion, The third stage is a battery module formed by the metal base layer.

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