Battery assembly cover, battery assembly, and vehicle including same

Abstract

Presented are a battery assembly cover, a battery assembly, and a vehicle including same, the battery assembly cover comprising: a base which is coupled to an open surface of a battery assembly case to seal the battery assembly case, has a plurality of first holes formed therein, and allows battery cell leads to pass through each of the first holes to expose the battery cell leads to the outside; and an insulation part which is coupled to the base, is positioned between the edge of the first holes of the base and the battery cell leads to insulate the battery cell leads from the base, and has second holes through which the battery cell leads pass.

Description

Battery assembly cover and battery assembly and vehicle including the same

[0001] The present invention relates to a battery assembly cover, a battery assembly, and a vehicle including the same, which enable simplification of the process for assembling a battery assembly and improve the overall performance of the battery.

[0002] Recently, technologies for carbon reduction are being actively developed to address environmental issues such as extreme temperatures. To achieve this, energy must be produced using environmentally friendly methods rather than relying on fossil fuels. This energy must be stored as electricity, and the stored electricity must be used in vehicles, various industrial sites, and homes.

[0003] To utilize electric energy for carbon reduction, the use of batteries capable of storing and extracting electric energy is essential. Therefore, ensuring battery performance is essential to sufficiently store electric energy and ensure hassle-free use.

[0004] Batteries primarily utilize redox reactions of metal ions. To increase battery capacity, charge / discharge performance, and efficiency, high-density metal ions are used. Extensive research is also being conducted on electrolyte components and solid electrolytes. However, as battery performance advances, stability generally declines.

[0005] Batteries used in vehicles, industrial applications, and homes are manufactured as physical units called packs. Battery packs contain multiple battery cells within a sealed case, preventing fire from spreading to the outside in the event of a battery overheating or other accident. They also protect the internal battery cells from deterioration caused by the external environment or physical damage.

[0006] A battery pack contains multiple battery cells, housed in an intermediate form called a module or assembly (CMA, Cell Module Assembly). A battery module or assembly is a battery assembly composed of multiple battery cells assembled into a single module or assembly. These modules are then fastened within a pack case, completing the battery pack. Maintenance is facilitated by allowing maintenance to be performed on a module or assembly basis.

[0007] Battery modules or assemblies are manufactured by connecting multiple battery cells and securing them to a module case or similar device. These cells are then connected using busbars. Busbars are bar-shaped conductors that enable electrical connection between battery cells and form part of the battery assembly, where the battery cells are stacked.

[0008] However, when using a busbar to electrically connect battery cells, it requires time and cost to manufacture a separate busbar, and space for the busbar must be provided in the battery assembly such as the battery module. In addition, when structurally connecting the busbar and the battery cell or battery assembly, it is difficult to achieve a complete integral connection, which may pose a problem to the durability of the battery assembly. Therefore, effective measures need to be prepared in relation to this.

[0009] The multiple unit battery cells that make up a battery assembly, such as a module or assembly, are comprised of a cathode, anode, and electrolyte. Because battery cells generate heat during charging and discharging, effective heat dissipation is essential. Furthermore, from the perspective of battery modules, assemblies, and battery packs, designing for efficient heat dissipation is essential to prevent safety accidents.

[0010] To improve battery performance, batteries must possess high energy density. In particular, vehicles face a shortage of space due to the incorporation of various devices. Therefore, technology is needed to efficiently stack battery assemblies, such as battery cells and modules, within the battery pack within a limited space, thereby securing free space.

[0011] Meanwhile, batteries can deteriorate due to manufacturing errors, excessive charging and discharging, and aging. If battery deterioration persists, it can ultimately lead to fire. Therefore, proactive measures are necessary to prevent battery fires. To achieve this, it's crucial to continuously monitor the battery's condition, proactively detect and respond to problems, and minimize damage in the event of an unexpected problem.

[0012] The matters described as background technology above are only intended to enhance understanding of the background of the present invention, and should not be taken as an admission that they correspond to prior art already known to those skilled in the art.

[0013] The present invention has been proposed to solve such problems, and provides a battery assembly cover and a battery assembly and a vehicle including the same, which can reduce costs by simplifying the assembly process and secure free space by exposing the leads of battery cells to the outside and welding them together without a separate structure such as a bus bar that connects the battery cells in the battery assembly manufacturing process, thereby improving battery performance.

[0014] The technical problems to be achieved in the present invention 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 invention belongs from the description below.

[0015] In order to achieve the above object, a battery assembly cover according to the present invention includes: a base coupled to an open surface of a battery assembly case to seal the battery assembly case, a plurality of first holes formed therein, and a lead of a battery cell passing through each of the first holes to expose the battery cell lead to the outside; and an insulating portion coupled to the base, positioned between the edge of the first hole of the base and the battery cell lead to insulate the battery cell lead from the base, and having a second hole formed therein through which the battery cell lead passes.

[0016] In the case of the battery assembly cover according to the present invention, a plurality of battery cells are stacked inside the battery assembly case, and the leads of each stacked battery cell can be exposed through the open surface of the battery assembly case.

[0017] In the case of the battery assembly cover according to the present invention, a plurality of battery cell leads are exposed to the outside by penetrating the first hole and the second hole, and the exposed battery cell leads can be electrically connected to the outside of the battery assembly case.

[0018] In the case of the battery assembly cover according to the present invention, a plurality of battery cell leads exposed to the outside of the battery assembly case through the first hole and the second hole can be joined by welding adjacent leads to each other on the outside of the battery assembly cover.

[0019] In the case of the battery assembly cover according to the present invention, a plurality of first holes may be formed spaced apart from each other at positions corresponding to the battery cell leads in the base.

[0020] In the case of the battery assembly cover according to the present invention, a plurality of second holes of the insulating part may be formed spaced apart from each other so as to be positioned to overlap with a plurality of first holes of the base.

[0021] In the case of the battery assembly cover according to the present invention, the first hole and the second hole are formed at positions corresponding to the battery cell leads in the base and the insulating portion, respectively, so that the battery cell leads can pass through the first hole and the second hole in a straight path.

[0022] In the case of the battery assembly cover according to the present invention, the base has a panel shape and a border is coupled to the battery assembly case to close the open surface of the battery assembly case.

[0023] In the case of the battery assembly cover according to the present invention, the base can be formed of a metal material.

[0024] In the case of the battery assembly cover according to the present invention, the insulating part is made of a non-conductive material and can be in contact with one surface of the base.

[0025] In the case of the battery assembly cover according to the present invention, the insulating portion is formed as a pair of non-conductive materials, and the base is positioned between the pair of insulating portions so that both sides of the base can be in contact with each of the pair of insulating portions.

[0026] In the case of the battery assembly cover according to the present invention, the battery lead can be bent after penetrating through both the first hole of the base and the second hole of a pair of insulating parts, and penetrating through the second hole of the outermost insulating part.

[0027] In the case of the battery assembly cover according to the present invention, the insulation portion positioned on the inner side facing the battery cell among the pair of insulation portions may be smaller in size than the base.

[0028] In the case of the battery assembly cover according to the present invention, the base is covered by an inner insulating portion and can be combined with the battery assembly case through the exposed edge.

[0029] In the case of the battery assembly cover according to the present invention, the insulating part positioned on the outer side facing outward among the pair of insulating parts may have a size equal to or larger than the base.

[0030] In the case of the battery assembly cover according to the present invention, at least one of the pair of insulating parts may have a portion where the second hole is formed recessed into the inside of the first hole, and the pair of insulating parts may be in surface contact with each other at the portion where the second hole is formed.

[0031] In the case of the battery assembly cover according to the present invention, the first hole of the base may be larger in size than the second hole of the insulating part.

[0032] In the case of the battery assembly cover according to the present invention, the second hole of the insulating part can be aligned in a straight path based on the center of each hole at a position corresponding to the first hole of the base.

[0033] In the case of the battery assembly cover according to the present invention, the first hole and the second hole may be arranged so that their respective center points coincide with each other, and the second hole may be arranged spaced inward based on the edge of the first hole.

[0034] In the case of the battery assembly according to the present invention, the battery assembly cover as described above is included.

[0035] In the case of a vehicle according to the present invention, a battery assembly cover as described above is included.

[0036] According to the battery assembly cover and battery assembly of the present invention and the vehicle including the same, the assembly process is simplified by exposing the leads of the battery cells to the outside and welding them together during the battery assembly manufacturing process, thereby reducing costs, and at the same time, by eliminating a separate structure connecting the battery cells, free space is secured, allowing additional battery cells or battery assemblies to be stacked, thereby improving the performance of the battery assembly and the overall upper system utilizing the same.

[0037] 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 invention belongs from the description below.

[0038] Figures 1 and 2 are drawings showing a battery assembly cover according to one embodiment of the present invention.

[0039] Figure 3 is a drawing showing the battery assembly cover illustrated in Figures 1 and 2 combined with the battery assembly.

[0040] FIG. 4 is a drawing showing the battery cell leads of the battery assembly cover illustrated in FIGS. 1 and 2 penetrating the first hole and the second hole.

[0041] FIG. 5 is a drawing showing a battery assembly cover according to another embodiment of the present invention.

[0042] Figure 6 is a drawing showing a battery pack and a vehicle to which the battery assembly cover of the present invention is applied.

[0043] In describing the embodiments disclosed in this specification, detailed descriptions of related known technologies will be omitted if it is determined that such detailed descriptions may obscure the gist of the embodiments disclosed in this specification. In addition, the attached drawings are provided solely to facilitate understanding of the embodiments disclosed in this specification, and the technical concepts disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, and substitutes included within the spirit and technical scope of the present invention.

[0044] 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.

[0045] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0046] In this specification, 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.

[0047] The suffixes "module" and "part" used for components in the following description are given or used interchangeably only for the convenience of writing specifications, and do not have distinct meanings or roles in themselves.

[0048] 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.

[0049] FIG. 1 and FIG. 2 are drawings showing a battery assembly cover according to one embodiment of the present invention, FIG. 3 is a drawing showing a state in which the battery assembly cover shown in FIG. 1 and FIG. 2 is combined with a battery assembly, FIG. 4 is a drawing showing a state in which a battery cell lead of the battery assembly cover shown in FIG. 1 and FIG. 2 penetrates a first hole and a second hole, FIG. 5 is a drawing showing a battery assembly cover according to another embodiment of the present invention, and FIG. 6 is a drawing showing a battery pack and a vehicle to which the battery assembly cover of the present invention is applied.

[0050] 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.

[0051] In automotive batteries, higher energy density is advantageous in terms of driving range, safety, and charging time. Therefore, efforts to increase battery energy density have become increasingly important. Because automotive batteries are placed within a limited space, methods to increase the energy density within the battery are being discussed.

[0052] As a method for achieving high energy density of a battery, there is a method of densely stacking battery cells (120) inside the battery. Battery cells (120) are the basic units that constitute a battery, and several battery cells (120) come together to form a battery module or assembly, which is a single battery assembly, and several battery assemblies such as battery modules or assemblies come together to form a single battery pack (BP) and are placed in a vehicle (V). By efficiently stacking battery cells (120) in a high density in a battery assembly such as a battery module or assembly, the energy efficiency of the battery inside the battery pack (BP) can be increased, and since the density of the battery cells (120) or battery assemblies inside the battery is controlled rather than adding separate additional components, battery performance can be improved in a limited space without interference with other components inside the vehicle (V).

[0053] A battery module or assembly is a battery assembly structured in the form of a case, frame, or strap, and refers to a plurality of battery cells (120) that are bundled in a certain number and laminated on a case or frame, etc. to protect the battery cells (120) from external shock, heat, vibration, etc. In the past, a battery module or assembly was formed by fixing a plurality of battery cells (120) to a case or frame, etc., and then electrically bundling the battery cells (120) using a busbar to form a circuit. A conventional busbar is a metal bar used to transmit current and serves to electrically connect the battery cells (120) to each other.

[0054] However, when forming a battery assembly using such busbars, there is a problem that a complex structure, such as a plastic structure for fixing the busbar, is required, and the manufacturing cost for manufacturing such a structure increases. In addition, since the battery assembly inevitably increases in volume in the longitudinal direction to mount the busbar, it becomes difficult to secure free space, making it difficult to maximize the energy density of the battery. In addition, since welding is impossible between the battery cell lead (140) and the plastic structure for fixing the busbar, there is a problem that the bonding stability is also low.

[0055] In the case of the present invention, as shown in FIG. 1, a plurality of battery cell leads (140) existing inside the battery assembly case (100) are exposed to the outside, and adjacent battery cell leads (140) are welded to each other to electrically connect the battery cells (120). Therefore, a complex plastic structure for fixing a conventional bus bar is not required, thereby reducing costs. In addition, since a bus bar is not required by directly welding adjacent battery cell leads (140), the volume of the battery assembly does not increase in the longitudinal direction, and accordingly, a spare space can be secured inside the battery pack (BP). By adding a battery assembly such as a battery cell (120) or a battery module through the spare space, the energy density of the battery can be increased, which can also help improve the overall performance of the battery.

[0056] However, since the busbar is removed and the leads of the battery cells are directly connected to each other, more rigidity is required at the connection between the leads. Therefore, in the case of the present invention, since the base (300) that is combined with the battery assembly case (100) made of a metal material is formed of a metal material, it is possible to weld the battery assembly case (100) and the base (300), thereby improving the connection rigidity of the battery cell leads and the assembly stability of the battery assembly.

[0057] Meanwhile, the battery assembly of the present invention refers to a state in which a plurality of battery cells (120) are stacked inside, and when the plurality of battery cells (120) are stacked in a case shape, it can be called a battery module, and when they are stacked in the form of a frame or strap, etc. rather than a case, it can be called an assembly. That is, the battery assembly of the present invention refers to a structured state in the form of a case, frame, strap, etc. in which a plurality of battery cells (120) are stacked inside, and thus refers to a battery module or assembly. However, the battery assembly of the present invention should not be interpreted only as a term limited to a battery module or assembly, but is preferably interpreted as a concept that includes all forms in which a plurality of battery cells (120) are stacked inside, including a battery module or assembly.

[0058] Specifically, in the case of the present invention, as shown in FIGS. 1 and 2, a part of a surface of a case (100) of a battery assembly in which battery cells (120) are stacked is opened, and a battery cell lead (140) is exposed through this open surface, and a base (300) and an insulating part (500) having a hole of a size through which the battery cell lead (140) can pass are used, and the battery cells (120) are exposed to the outside by passing through each hole, so that adjacent battery cells (120) are directly welded to each other, thereby proposing a battery assembly cover in which the battery cell leads (140) are directly electrically connected to the outside without a bus bar.

[0059] The battery assembly cover of the present invention has an open surface in which a battery cell lead (140) is exposed in a battery assembly case (100), as shown in FIG. 1, and a plurality of first holes (320) are formed in a base (300) that is coupled to the open surface of the battery assembly case (100) and seals the battery assembly case (100), and the battery cell lead (140) passes through the first hole (320) of the base (300) and is exposed to the outside. In addition, an insulating portion (500) that is coupled to the base (300) and is responsible for insulation between the base (300) and the battery cell lead (140) exists, and a second hole (522) that the battery cell lead (140) passes through to the outside is formed in the insulating portion (500).

[0060] Meanwhile, battery cells (120) are divided into unidirectional cells and bidirectional cells depending on whether the types of electrodes located at the outermost end are the same. A unidirectional cell is a battery cell (120) in which positive and negative electrodes appear alternately in one direction, and a bidirectional cell refers to a battery cell (120) in which the same electrodes are located at the outermost electrode positions. In the case of the drawing of the present invention, the drawing shows a battery assembly cover () in which battery cells (120) having unidirectional cells are stacked, but in the case of a bidirectional cell, the present invention exposes the battery cell lead (140) at the outermost end and enables electrical connection between battery cells (120) without a bus bar by welding adjacent battery cells (120).

[0061] Meanwhile, the electrical connection of the present invention refers to connecting battery cells (120) to each other in series or parallel, etc. When connecting battery cells (120) in series, the voltage can be increased, so that a battery with a desired capacity and voltage can be obtained by connecting battery cells (120) in series or parallel as needed.

[0062] A plurality of battery cell leads (140) are exposed to the outside by penetrating both the first hole (320) of the base (300) and the second hole (522) of the insulation (500), as shown in FIGS. 2 and 3, and the exposed battery cell leads (140) are electrically connected to the outside of the battery assembly case (100). In the case of electrical connection, the battery cell leads (140) are connected in series or parallel, and adjacent battery cells (120) among the battery cells (120) exposed to the outside can be welded to each other. This simplifies the manufacturing process of the battery assembly itself, thereby reducing the manufacturing cost, since electrical connection between battery cells (120) becomes possible without additional structures such as bus bars, and since there is no additional structure, free space can be secured, and accordingly, battery assemblies such as battery cells (120) or battery modules can be stacked to have a higher energy density, which also helps improve battery performance.

[0063] In the case of batteries installed in vehicles (V), collision resistance must be secured and secondary damage must be prevented in the event of a fire. Therefore, the case (100) of the battery assembly may be formed of a metal material. Furthermore, among metals, it may be manufactured from aluminum, which is easy to form, lightweight, and has excellent durability.

[0064] In the case of the base (300), since the open surface of the battery assembly case (100) must be closed as shown in FIGS. 2 and 3, it can be formed in the shape of a panel or the like corresponding to the open surface, and since it must be combined with the battery assembly case (100) while closing the open surface of the battery assembly case (100), it can be formed of a metal material. Since the battery assembly case (100) and the base (300) are made of metal, joining them by welding is the method that can most effectively secure durability, and the base (300) can be formed of the same metal material as the battery assembly case (100) for excellent bonding strength with the battery assembly case (100).

[0065] Of course, the battery assembly case (100) and the base (300) can be joined in various ways, such as by bonding or mechanical fastening, in addition to welding.

[0066] A first hole (320) is formed in the base (300) at a position corresponding to the battery cell lead (140) through which the battery cell lead (140) can pass. The first hole (320) has a shape that penetrates both sides of the base (300), and a plurality of first holes (320) are formed spaced apart from each other at positions corresponding to the battery cell lead (140) when the battery assembly case (100) and the base (300) are joined by welding or other methods. The first hole (320) can be formed by punching the base (300) made of a metal material at a constant interval at a position corresponding to the battery cell lead (140) during the manufacturing process.

[0067] The base (300) is combined with the insulating portion (500) to form a cover of the battery assembly, and the formed battery assembly cover functions to close the open surface of the battery assembly case (100), thereby functioning as a housing for the battery assembly case (100). Since the battery assembly has a structure in which battery cells (120) are stacked inside the battery assembly case (100), the battery assembly cover that serves as the housing must have durability against collisions, fire, etc.

[0068] In addition, since the base (300) is formed of a metal material, an electrical short may occur when it comes into contact with the current flowing through the battery cell lead (140), which may cause secondary damage due to overcurrent. Therefore, it is preferable that the size of the first hole (320) be formed large enough not to come into contact with the battery cell lead (140). That is, the battery assembly cover, which functions as a housing for the battery assembly case (100), must be formed of a material having sufficient rigidity to protect the battery cells (120) from external impact, and the first hole (320) of the base (300) must be formed to a size large enough that the battery cell lead (140) can penetrate through it but not come into contact with it in order to prevent a short between the base (300) formed of metal and the battery cell lead (140).

[0069] Meanwhile, the insulating portion (500) is made of a non-conductive material and comes into contact with one surface of the base (300) to provide insulation between the battery cell lead (140) and the base (300). The insulating portion (500) serves to insulate not only between the base (300) and the battery cell lead (140), but also between the base (300) and the battery cell (120) or between the base (300) and metal parts outside the battery assembly, so it must be a material that is strong in electrical insulation, and it must be a heat-resistant material that can withstand high-temperature situations such as fire when an abnormality occurs in the battery, so it can be formed of a material such as mica.

[0070] In the insulating portion (500), a second hole (522) is formed as shown in FIGS. 1 and 2, and a plurality of second holes (522) are formed spaced apart from each other so as to be arranged at positions overlapping the plurality of first holes (320) of the base (300). When the first hole (320) and the second hole (522) are arranged at positions overlapping each other in this way, the second hole (522) is also formed at a position corresponding to the battery cell lead (140) due to the first hole (320) being formed at a position corresponding to the battery cell lead (140), and as a result, the battery cell lead (140) can pass through the first hole (320) and the second hole (522) in a straight path.

[0071] The battery assembly cover of the present invention refers to a cover that is coupled to a base (300) and an insulating portion (500) that are coupled to each other as shown in FIGS. 1 and 2, and that closes the open surface of the battery assembly case (100). In the case of the base (300) made of a metal material and the insulating portion (500) formed of a material such as mica, they can be coupled to each other with an adhesive, or structurally coupled using a hook or the like. The base (300) and the insulating portion (500) can be assembled while being coupled to each other during the manufacturing process, thereby reducing the manufacturing cost. In addition, since the overlapping portions of the first hole (320) and the second hole (522) can be easily aligned, the manufacturing tolerance can be reduced so that the battery cell lead (140) can be exposed to the outside without interference even when coupled with the battery assembly case (100).

[0072] Therefore, before joining the battery assembly cover to the open surface of the battery assembly case (100), it is preferable to first join the base (300) and the insulating part (500) constituting the battery assembly cover to complete the battery assembly cover, and then join them while closing the open surface of the battery assembly case (100).

[0073] Since the base (300) is formed of a metal material, if it comes into direct contact with the battery cell lead (140) through which current flows, an electrical short may occur, which may result in secondary damage due to overcurrent. Therefore, when the battery cell lead (140) passes through the first hole (320) of the base (300), the battery cell lead (140) must not come into contact with the edge of the first hole (320) that forms part of the base (300). Referring to FIG. 4, the present invention proposes a battery assembly cover formed so that the size of the first hole (320) of the base (300), which is the dotted line part, is formed larger than the size of the second hole (542) of the insulating part (540), which is the solid line part, so that the battery cell lead (140) simultaneously penetrates the first hole (320) and the second hole (542), but is positioned within the area of ​​the second hole (542), thereby preventing contact with the edge of the first hole (320).

[0074] Specifically, the second hole (542) of the insulating portion (500), which is the solid line portion in FIG. 4, is aligned in a straight path based on the center of each hole at a position corresponding to the first hole (320) of the base (300), which is illustrated as the dotted line portion, so that the center points coincide. In a state where the center points coincide, the second hole (542) is spaced inward based on the edge of the first hole (320), and the battery cell lead (140) penetrates both the first hole (320) and the second hole (542), but cannot escape from the area of ​​the second hole (542), thereby preventing contact with the first hole (320).

[0075] This can prevent electrical short between the battery cell lead (140) made of metal and the first hole (320) of the base (300), thereby preventing secondary damage caused by overcurrent and helping to improve the overall safety of the battery.

[0076] The insulating portion (500) is formed of a non-conductive material such as mica and serves to electrically insulate not only the battery cell lead (140) and the base (300), but also between the metal parts outside the battery cell (120) and the base (300). Therefore, the insulating portion (500) must be responsible for electrical insulation not only between the battery cell lead (140) and the base (300) as shown in FIGS. 1 and 2, but also between the base (300) and metal parts located outside the battery assembly, and thus may be present on the outside of the base (300).

[0077] Accordingly, the insulating part (500) can be configured as a pair that covers both sides of the base (300) based on the base (300), and can be divided into an insulating part (520) positioned on the inside facing the battery cell (120) based on the base (300) and an insulating part (540) positioned on the outside facing the outside by contacting each side of the base (300).

[0078] In the case of the battery assembly cover of the present invention, as shown in FIG. 1, it may be composed of a base (300) and an inner insulating portion (520) and an outer insulating portion (540) that cover both sides of the base and are in surface contact with both sides of the base. In order to reduce manufacturing tolerance and increase assembly stability, it is preferable to manufacture the battery assembly cover in a form in which the base (300) and a pair of insulating portions (520, 540) are combined in advance before being combined with the battery assembly case (100), and then, as shown in FIG. 3, the completed battery assembly cover is combined with the battery assembly case (100).

[0079] In addition, in the case of FIG. 2, the outer insulating portion (540) is separately expressed to explain the coupling relationship of the battery assembly cover, but in the case of the battery assembly cover of the present invention, it is not necessary that the base (300) and a pair of insulating portions (520, 540) be coupled first and then coupled to the battery assembly case (100), and the inner insulating portion (520), base (300), and outer insulating portion (540) may be coupled in sequence to the open surface of the battery assembly case (100).

[0080] The base (300) is made of a metal material and, as shown in FIG. 3, closes the open surface of the battery assembly case (100) and is joined to the edge of the open surface of the battery assembly case (100) by welding or other methods. Therefore, among the pair of insulating parts (500), the insulating part (520) arranged on the inner side facing the battery cell (120) is formed to be smaller than the base (300) as shown in FIG. 1 so that the edge of the base (300) can be joined to the edge of the open surface of the battery assembly case (100), and the insulating part (540) arranged on the outer side facing outward with respect to the base (300) sufficiently closes the open surface of the battery assembly case (100) and can be made to have the same size as the base (300) or a larger size than the base (300) in order to ensure insulation between the base and external metal parts.

[0081] As shown in Fig. 1, the inner insulation part (520) and the outer insulation part (540) are arranged in contact with each other on both sides of the base (300), and the inner insulation part (520) and the outer insulation part (540) are each formed with a second hole (522, 542), and each second hole (522, 542) is formed at a position corresponding to the first hole (320) of the base (300) and the battery cell lead (140). By contacting the inner insulation part (520) and the outer insulation part (540) on both sides of the base (300) with respect to the base (300), the battery cell lead (140) penetrates both the second hole (522) of the inner insulation part (520) and the second hole (542) of the outer insulation part (540), and thus exists inside each of the second holes (522, 542), so that the battery cell lead (140) is larger than the second hole (522, 542) and is more reliably prevented from contacting the first hole (320) made of metal, thereby reducing the possibility of secondary damage due to an electrical short.

[0082] FIG. 5 illustrates another embodiment of a battery assembly cover, which includes a pair of insulating parts (500) that contact both sides of a base (300), and at least one of the pair of insulating parts (500) is formed such that a portion where a second hole (522, 542) is formed is recessed into the inside of a first hole (320), so that the pair of insulating parts (500) are in surface contact with each other at a portion where the second hole (522) is formed.

[0083] As illustrated, since the first hole (320) is larger than the second hole (522, 542), the battery cell lead (140) passes through the first hole (320) and the second hole (522, 542) without touching the first hole (320). However, if the base (300) and the insulation (500) are shocked by the external environment of the battery assembly, such as vibration or external shock, the battery cell lead (140) may momentarily come into contact with the first hole (320), resulting in an electrical short circuit.

[0084] To prevent this, the inner insulation part (520) is formed in a shape in which it is bent and inserted into the first hole (320) of the base (300) so as to make surface contact with the outer insulation part (540), thereby preventing the base (300) and the battery cell lead (140) from coming into contact with each other in advance, and the battery assembly can be more firmly fixed as the inner insulation part (520) and the outer insulation part (540) are in direct contact with each other.

[0085] In Fig. 5, the wider the area of ​​the surface contact portion (560), the greater the bonding force between the inner insulation portion (520) and the outer insulation portion (540), and accordingly, a battery assembly cover with improved durability can be manufactured. Therefore, the battery assembly cover can be manufactured by bending the inner insulation portion (520) at a point where the battery cell lead (140) can smoothly penetrate the first hole (320) and the second hole (522, 542) while maximizing the surface contact portion (560) and then inserting it into the inside of the first hole (320) to be combined with the outer insulation portion (540).

[0086] Meanwhile, the battery assembly cover according to the present invention can be applied to battery packs (BP) of various vehicles (V) such as internal combustion engine vehicles, electric vehicles, hybrid vehicles, and fuel cell vehicles, as shown in FIG. 6, and in addition to vehicles (V), it can be applied to battery packs (BP) in various fields such as industrial ESS (Energy Storage System), household ESS, and small battery packs.

[0087] Although the present invention has been illustrated and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that the present invention may be variously improved and modified without departing from the technical spirit of the present invention as defined by the following claims.

Claims

1. A base that is coupled to the open surface of the battery assembly case to seal the battery assembly case, has a plurality of first holes formed, and allows the battery cell leads to pass through each of the first holes so that the battery cell leads are exposed to the outside; and A battery assembly cover comprising an insulating portion which is coupled to a base and is positioned between a first hole edge of the base and a battery cell lead to insulate the battery cell lead from the base, and has a second hole formed through which the battery cell lead passes.

2. In claim 1, A battery assembly cover characterized in that a plurality of battery cells are stacked inside the battery assembly case and the leads of each stacked battery cell are exposed through the open surface of the battery assembly case.

3. In claim 1, A battery assembly cover characterized in that a plurality of battery cell leads are exposed to the outside through the first hole and the second hole, and the exposed battery cell leads are electrically connected to the outside of the battery assembly case.

4. In claim 1, A battery assembly cover characterized in that a plurality of battery cell leads exposed to the outside of the battery assembly case through the first hole and the second hole are welded to each other on the outside of the battery assembly cover.

5. In claim 1, A battery assembly cover characterized in that the first hole is formed in multiple pieces spaced apart from each other at positions corresponding to the battery cell leads on the base.

6. In claim 1, A battery assembly cover characterized in that a plurality of second holes of the insulation part are formed spaced apart from each other so as to overlap with a plurality of first holes of the base.

7. In claim 1, A battery assembly cover characterized in that the first hole and the second hole are formed at positions corresponding to the battery cell leads in the base and the insulation, respectively, so that the battery cell leads pass through the first hole and the second hole in a straight path.

8. In claim 1, A battery assembly cover characterized in that the base is in the shape of a panel and the frame is joined to the battery assembly case to close the open surface of the battery assembly case.

9. In claim 1, A battery assembly cover characterized in that the base is molded from a metal material.

10. In claim 1, A battery assembly cover characterized in that the insulating part is made of a non-conductive material and is in contact with one surface of the base.

11. In claim 1, A battery assembly cover characterized in that the insulating portion is composed of a pair of non-conductive materials, and the base is positioned between the pair of insulating portions, such that both sides of the base are in contact with each of the pair of insulating portions.

12. In claim 11, A battery assembly cover characterized in that the battery lead penetrates both the first hole of the base and the second hole of a pair of insulators, and is bent after penetrating the second hole of the outermost insulator.

13. In claim 11, A battery assembly cover characterized in that the insulator positioned on the inner side facing the battery cell among a pair of insulators is smaller in size than the base.

14. In claim 11, A battery assembly cover characterized in that the base is covered by an inner insulating member and is joined to the battery assembly case through an exposed rim.

15. In claim 11, A battery assembly cover characterized in that the insulation portion positioned on the outer side facing outward among a pair of insulation portions is equal to or larger in size than the base.

16. In claim 11, A battery assembly cover, characterized in that at least one of a pair of insulating parts is recessed into the inside of the first hole at a portion where the second hole is formed, and the pair of insulating parts are in surface contact with each other at a portion where the second hole is formed.

17. In claim 1, A battery assembly cover characterized in that the first hole of the base is larger than the second hole of the insulation.

18. In claim 1, A battery assembly cover characterized in that the second hole of the insulation part is aligned in a straight path based on the center of each hole at a position corresponding to the first hole of the base.

19. In claim 1, A battery assembly cover characterized in that the first hole and the second hole are arranged so that their respective centers coincide with each other, and the second hole is arranged spaced inward based on the edge of the first hole.

20. A battery assembly characterized by including the battery assembly cover of claim 1.

21. A vehicle characterized by including a battery assembly cover of claim 1.

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