Battery pack

Abstract

A battery pack according to an embodiment of the present invention comprises: a battery module including a battery cell stack in which a plurality of battery cells are stacked; a pack housing having the battery module mounted therein; and a coupling member for coupling between the battery module and the pack housing, the coupling member including a pack fixing part capable of being fixed between the pack housing and the coupling member, and a battery module fixing part capable of being fixed between the battery module and the coupling member, wherein the specification of the battery module fixing part of each of a plurality of coupling members is provided to correspond to the specification of the battery module that may be mounted in the pack housing, such that a coupling member suitable for the specification of the battery module to be mounted in the pack housing is selected and coupled to the battery module, from among the plurality of coupling members that may be coupled to the pack housing.

Description

battery pack

[0001] Cross-citation with related application(s)

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0074562, filed June 7, 2024, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to a battery pack, and more particularly, to a battery pack in which battery modules of various specifications can be combined by changing / replacing them within a single pack housing.

[0004] In modern society, the widespread use of portable devices like cell phones, laptops, camcorders, and digital cameras, as well as energy storage systems (ESS), has led to active development of related technologies. Furthermore, rechargeable secondary batteries are increasingly being used as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (P-HEVs) to address air pollution issues caused by conventional gasoline-powered vehicles. This, in turn, heightens the need for further development of these batteries.

[0005] Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are receiving the most attention due to their advantages of free charging and discharging, low self-discharge rate, and high energy density.

[0006] These lithium secondary batteries primarily use lithium oxide and carbon materials as the positive and negative electrode active materials, respectively. Lithium secondary batteries comprise an electrode assembly comprising positive and negative plates coated with the positive and negative electrode active materials, respectively, with a separator interposed between them, and an outer case, i.e., a battery case, that seals and encloses the electrode assembly together with an electrolyte.

[0007] In general, lithium secondary batteries can be classified into can-type secondary batteries in which the electrode assembly is built into a metal can and pouch-type secondary batteries in which the electrode assembly is built into a pouch of an aluminum laminate sheet, depending on the shape of the outer packaging material.

[0008] In the case of secondary batteries used in small devices, 2-3 battery cells are arranged, but in the case of secondary batteries used in medium to large devices such as automobiles, a battery module in which multiple battery cells are electrically connected is used. Such a battery module improves capacity and output by forming a battery cell stack by connecting multiple battery cells in series or parallel. One or more battery modules can be mounted together with various control and protection systems such as a battery management system (BMS), a battery disconnect unit (BDU), and a cooling system to form a battery pack.

[0009] A battery pack includes battery modules as a sub-concept, and a battery module includes battery cells as a sub-concept. The number of battery cells contained in a battery module or the number of battery modules contained in a battery pack can vary depending on the output or capacity of the battery pack required for an electric vehicle or energy storage system (ESS).

[0010] Meanwhile, in the conventional technology, the part where the battery module is coupled within the pack housing of the battery pack is fixedly provided, so when the specifications of the battery module are changed / replaced, the corresponding pack housing must also be replaced, which is cumbersome.

[0011] Therefore, a method is required that can combine battery modules of various specifications into a single pack housing.

[0012] The purpose of the present invention is to provide a battery pack in which battery modules of various specifications can be combined by changing / replacing them within one pack housing.

[0013] However, the problems to be solved by the embodiments of the present invention are not limited to the problems described above and can be expanded in various ways within the scope of the technical ideas included in the present invention.

[0014] According to one embodiment of the present invention, a battery pack includes: a battery module including a battery cell stack in which a plurality of battery cells are stacked; a pack housing in which the battery module is mounted; and a coupling member including a pack fixing part that can be fixed between the pack housing and the coupling member and a battery module fixing part that can be fixed between the battery module and the coupling member so as to be coupled between the battery module and the pack housing, wherein a coupling member suitable for a specification of the battery module to be mounted on the pack housing is selected from among a plurality of coupling members that can be coupled to the pack housing and coupled with the battery module, and the specifications of the battery module fixing part of each of the plurality of coupling members can be provided to correspond to the specifications of the battery module that can be mounted on the pack housing.

[0015] The battery module includes a coupling member mounting portion coupled to the coupling member, and the specifications of the battery module fixing portion of each of the plurality of coupling members may be provided to correspond to the specifications of the coupling member mounting portion of the battery module that can be mounted to the pack housing.

[0016] The above battery module includes a module housing in which the battery cell stack is stored, and the bonding member mounting portion can be provided in the module housing.

[0017] The battery module includes an end plate that supports at least one side of the battery cell stack, and the bonding member mounting portion can be provided on the end plate.

[0018] The battery module fixing portion of the above-mentioned joining member and the joining member mounting portion of the battery module each include at least one fastening hole, and a fastening hole is inserted through the fastening hole of the battery module fixing portion of the above-mentioned joining member and the fastening hole of the joining member mounting portion of the battery module, thereby fixing the battery module and the joining member, and the specification may include at least one of the size, position, number, shape, structure, and arrangement of the fastening holes.

[0019] Among the plurality of connecting members, the connecting hole of the battery module fixing portion of the selected connecting member and the connecting hole of the connecting member mounting portion of the battery module are aligned in a row, and the connecting hole passes through the connecting member, thereby enabling connection between the connecting member and the battery module.

[0020] Among the plurality of connecting members, the size, position, number, shape, structure, and arrangement of the fastening holes of the battery module fixing portion of the selected connecting member may be consistent with the size, position, number, shape, structure, and arrangement of the fastening holes of the connecting member mounting portion of the battery module.

[0021] At least some of the above-described plurality of connecting members may each have different sizes, positions, numbers, shapes, structures, and arrangements of the fastening holes.

[0022] The battery module may be provided with a plurality of the above-described connecting member mounting portions, each of which may include the connecting member mounting portions on opposite sides of the battery module, or each of which may include the connecting member mounting portions on each corner of the battery module, and the connecting member mounting portions of the battery module and the battery module fixing portions of the connecting member may be provided as a plurality of sets.

[0023] The pack housing includes a coupling member mounting portion on which the coupling member is mounted, and the specifications of the pack fixing portion of each of the plurality of coupling members may be provided to correspond to the specifications of the coupling member mounting portion of the pack housing.

[0024] The specifications of the pack fixing portion of each of the plurality of connecting members and the specifications of the connecting member mounting portion of the pack housing may be the same regardless of the specifications of the battery module.

[0025] The pack fixing portion of the above-mentioned joining member and the joining member mounting portion of the pack housing each include at least one fastening hole, and a fastening hole is inserted through the fastening hole of the pack fixing portion of the above-mentioned joining member and the fastening hole of the joining member mounting portion of the pack housing, thereby fixing the joining member and the pack housing together, and the specification may include at least one of the size, position, number, shape, structure, and arrangement of the fastening holes.

[0026] The fastening holes of the pack fixing portion of each of the plurality of connecting members and the fastening holes of the connecting member mounting portion of the pack housing are aligned in a row, and the connecting holes penetrate therethrough, thereby enabling connection between the connecting member and the battery module.

[0027] The size, position, number, shape, structure, and arrangement of the fastening holes of the pack fixing portion of each of the plurality of connecting members may be consistent with the size, position, number, shape, structure, and arrangement of the fastening holes of the connecting member mounting portion of the pack housing.

[0028] In the above-mentioned joining member, the battery module fixing portion may be located on a different surface from the surface on which the pack fixing portion is located.

[0029] The above-mentioned connecting member may further include a connecting member formed symmetrically left and right or up and down.

[0030] The above-mentioned joining member and the pack housing can be formed integrally.

[0031] According to the present invention, battery modules of various specifications can be changed / replaced and combined within a single pack housing, thereby increasing manufacturing efficiency and reducing costs.

[0032] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0033] FIG. 1 is a schematic diagram of a battery pack according to one embodiment of the present invention.

[0034] FIG. 2 is an enlarged view of a battery module and a bonding member coupled to the battery module of one embodiment of FIG. 1.

[0035] Figure 3 is an exploded perspective view of Figure 2.

[0036] FIG. 4 is a reference drawing of FIG. 2, and is an enlarged view of a battery module and a connecting member coupled to the battery module of another embodiment of FIG. 1.

[0037] Figure 5 is an enlarged view of part A of Figure 2.

[0038] Fig. 6 (a) shows a cross-sectional view along the line BB of the joint member mounting portion provided in the battery module of Fig. 5, and Fig. 6 (b) shows a top view of the joint member of Fig. 5.

[0039] Figure 7 is a reference drawing of Figure 6, and depicts each of the drawings (a) and (b) of Figure 6 rotated by 90 degrees.

[0040] Figure 8 illustrates a modified embodiment of Figure 6.

[0041] Fig. 9 (a) illustrates a coupling member mounting portion provided in the pack housing of Fig. 1, and Fig. 9 (b) illustrates a pack fixing portion provided in the coupling member described above in Figs. 1 to 8.

[0042] FIG. 10 and FIG. 11 are each a state diagram of use of the battery pack (1000) and the connecting member (200) described above in FIG. 1 to FIG. 9.

[0043] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0044] In order to clearly explain the present invention, parts that are not related to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0045] Furthermore, 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 the illustrated components. In the drawings, the thicknesses are enlarged to clearly represent various layers and regions. Furthermore, in the drawings, the thicknesses of some layers and regions are exaggerated for convenience of explanation.

[0046] Furthermore, when we say that a layer, membrane, region, plate, or other part is "on" or "over" another part, this includes not only cases where it is "directly on" the other part, but also cases where there are other parts in between. Conversely, when we say that a part is "directly on" another part, it means that there are no other parts in between. Furthermore, saying that a part is "on" or "over" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "above" or "over" the direction opposite to gravity.

[0047] Additionally, throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0048] Additionally, throughout the specification, when we say "in plan", we mean when the target portion is viewed from above, and when we say "in cross section", we mean when the target portion is viewed from the side in a cross-section cut vertically.

[0049] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0050] First, FIG. 1 briefly illustrates a conceptual diagram of a battery pack according to one embodiment of the present invention.

[0051] A battery pack (1000) includes at least one battery module (100) in a pack housing (1100). FIG. 1 illustrates an example in which a plurality of battery modules (100) are provided in a battery pack (1000). When a plurality of battery modules (100) are accommodated in a pack housing (1100), for example, the internal space of the pack housing (1100) may be partitioned by a cross beam (1200), and then the battery modules (100) may be mounted in each of the partitioned internal spaces of the pack housing (1100).

[0052] A method for fixing a battery module (100) mounted on a pack housing (1100) may be provided, for example, by including a fastening hole for fastening in each of the pack housing (1100) and the battery module (100), and fastening may be performed in a manner in which a fastening member (e.g., a bolt) is inserted into the fastening hole of the pack housing (1100) and the fastening hole of the battery module (100).

[0053] Meanwhile, according to the prior art, when the specifications of the battery module (100) mounted on the pack housing (1100) are changed, the size and position of the fastening hole of the battery module (100) become different, so there was the inconvenience of having to prepare a new pack housing (1100). This also became a factor in increasing the cost.

[0054] However, according to the present invention, even if the specifications of the battery module (100) are changed / replaced, for example, even if the battery module (100-1) is changed / replaced with the battery module (100-2), the existing pack housing (1100) can be used as is.

[0055] FIG. 2 is an enlarged view of a battery module and a connecting member coupled to the battery module of one embodiment of FIG. 1. FIG. 3 is an exploded perspective view of the battery module of FIG. 2. FIG. 4 is a reference drawing of FIG. 2, and is an enlarged view of a battery module and a connecting member coupled to the battery module of another embodiment of FIG. 1.

[0056] In FIGS. 2 and 3, a battery module (100-1) is illustrated as one embodiment of a battery module. In FIG. 4, a battery module (100-2) is illustrated as another embodiment of a battery module.

[0057] First, according to the present invention, although the battery module (100-1) of FIG. 2 and the battery module (100-2) of FIG. 4 are different battery modules, they can be mounted on the same type of pack housing (1100) of FIG. 1 by appropriately selecting the connecting member (200) described later.

[0058] Referring to FIGS. 2 and 3, the battery module (100) includes a battery cell stack (10) in which a plurality of battery cells are stacked, and the battery cell stack (10) can be housed in a module housing (110). A busbar housing assembly (not shown) can be coupled to a portion of the battery cell stack (10) where electrode leads are located, and the battery module (100) can be assembled in such a manner that the busbar housing assembly is covered with an end plate (120).

[0059] Alternatively, in some cases, the battery module (100) may be a so-called module-less battery module. In other words, a battery module may be formed by placing end plates on one side or both sides facing each other of the battery cell stack (10) and binding the battery cell stack (10) and the end plates together with a strap or the like to form a cell module assembly (CMA).

[0060] The battery module (100) according to the present invention is not limited to those illustrated in FIGS. 2 to 4, and may employ a conventional battery module. In this case, it is sufficient for the battery module (100) according to the present invention to have a structure to which the joining member (200) according to the present invention can be joined.

[0061] Fig. 5 is an enlarged view of part A of Fig. 2. Fig. 6 (a) is a cross-sectional view along line BB of the connecting member mounting portion provided in the battery module of Fig. 5. Fig. 6 (b) is a top view of the connecting member of Fig. 5. Fig. 7 is a reference drawing of Fig. 6, showing each of the drawings of Fig. 6 (a) and (b) rotated 90 degrees.

[0062] In the embodiments of FIGS. 2 to 6, the joining member (200) is joined to the battery module (100), and more specifically, the joining member (200) is joined to the end plate (120) of the battery module. However, the present invention is not limited thereto, and it is sufficient if the joining member (200) is joined to the battery module (100) so that the battery module (100) can be mounted on the pack housing (1100), and various modifications and changes are possible, such as the joining member (200) being joined to the module housing (110).

[0063] Referring to (a) of FIG. 6 and (a) of FIG. 7, the joint member mounting portion (130) of the battery module (100) includes at least one fastening hole (131) through which a fastening member (not shown) can pass so as to be coupled with the joint member (200). Similarly, referring to (b) of FIG. 6 and (b) of FIG. 7, the joint member (200) includes at least one fastening hole (131) through which the fastening member can pass so as to be coupled with the battery module (100). The fastening hole (131) of the joint member mounting portion (130) of the battery module (100) may be formed, for example, to pass through in the vertical direction of the battery module (100).

[0064] Meanwhile, at least one of the size, position, number, shape, structure, and arrangement of the fastening hole (131) may be different depending on the specifications / model / type of the battery module (100). Therefore, in the case of directly connecting the battery module (100) to the battery pack (1000) in the prior art, the pack housing (1100) of the battery pack (1000) must also be changed / replaced accordingly.

[0065] However, according to the present invention, a joining member (200) is included, and the joining member (200) includes a battery module fixing portion (210). The battery module fixing portion (210) of the joining member (200) is coupled with a joining member mounting portion (130) of a battery module (100). To this end, the joining member (200) includes at least one fastening hole (211) in the battery module fixing portion (210), and the fastening hole (211) of the joining member (200) corresponds to (matches) at least one fastening hole (131) of the joining member mounting portion (130) of the battery module (100). In detail, the fastening hole (211) of the joining member (200) and the fastening hole (131) of the joining member mounting portion (130) of the battery module (100) may be connected in a row. Accordingly, the fastener can penetrate both the fastening hole (211) of the joining member (200) and the fastening hole (131) of the joining member mounting portion (130) of the battery module (100), thereby being fixed between the joining member (200) and the battery module (100).

[0066] To this end, according to the present invention, a variety of connecting members (200) suitable for various specifications / models / types of battery modules (100) are provided, and a connecting member (200) suitable for the specifications / models / types of the selected battery module (100) is selected. The connecting member (200) selected to suit the specifications / models / types of the battery module (100) is connected to the connecting member mounting portion (130) of the battery module (100). To this end, a plurality of connecting members (200) are provided, and each of the plurality of connecting members (200) includes a battery module fixing portion (210) having a variety of specifications / models / types suitable for the various specifications / models / types of the battery module (100).

[0067] In the embodiment of Fig. 6, among the first connecting member (200-1) and the second connecting member (200-2) exemplarily illustrated, the first connecting member (200-1) suitable for the first battery module (100-1) is selected. At this time, the specification / model / type of the battery module fixing part (210) of the first connecting member (200-1) is different from the specification / model / type of the battery module fixing part (210) of the second connecting member (200-2).

[0068] More specifically, in the examples of FIGS. 6 and 7, the number of fastening holes (131) of the joint member mounting portion (130) of the battery module (100) and the number of fastening holes (211) of the joint member (200) are each two, and the cross-section (horizontal cross-section) is formed in a circular shape.

[0069] In addition, the position, size, and arrangement of the fastening hole (211) of the connecting member (200) are the same as the position, size, and arrangement of the fastening hole (131) of the connecting member mounting portion (130) of the battery module (100). Referring to the dotted line illustrated in FIG. 6, it can be seen that the position, size, and arrangement of the fastening hole (211) of the connecting member (200) are the same as the position, size, and arrangement of the fastening hole (131) of the connecting member mounting portion (130) of the battery module (100) in the horizontal direction (X-axis direction in the drawing). Similarly, referring to the dotted line illustrated in FIG. 7, it can be seen that the position, size, and arrangement of the fastening hole (211) of the connecting member (200) are the same as the position, size, and arrangement of the fastening hole (131) of the connecting member mounting portion (130) of the battery module (100) in the vertical direction (Y-axis direction in the drawing).

[0070] Meanwhile, the fastener may be, for example, screw-connected to the fastening hole (211) of the connecting member (200) and the fastening hole (131) of the battery module (100), and for example, the fastening hole may have a male screw shape, and the fastening hole (211) of the connecting member (200) and the fastening hole (131) of the battery module (100) may have a female screw shape.

[0071] However, the present invention is not limited thereto, and various modifications and changes are possible. For example, the fastener may be simply connected by welding or the like by passing through the fastening hole (211) of the connecting member (200) and the fastening hole (131) of the battery module (100). Alternatively, the fastener may include a hook, and may include a hooking groove between the fastening hole (211) of the connecting member (200) and the fastening hole (131) of the battery module (100), so that the fastening is connected by hooking.

[0072] Fig. 8 illustrates a modified embodiment of Fig. 6. Fig. 8 exemplarily illustrates a case in which a second joining member (200-2) suitable for a second battery module (100-2) is selected among the first joining member (200-1) and the second joining member (200-2) of Fig. 6.

[0073] The example of Fig. 8 illustrates a case where the first battery module (100-1) of Fig. 6 is changed to the second battery module (100-2) of Fig. 8. At this time, the position, size, and arrangement of the fastening hole (211) of the second battery module (100-2) of Fig. 8 are different from the position, size, and arrangement of the fastening hole (211) of the first battery module (100-1) of Fig. 6. Accordingly, Fig. 8 illustrates a case where the second fastening member (200-2) corresponding to the second battery module (100-2) is selected among the first fastening member (200-1) and the second fastening member (200-2) of Fig. 6.

[0074] In addition, the description of the method of joining between the battery module (100) and the joining member (200) in the embodiment of FIG. 8 overlaps with that described in FIGS. 6 and 7, so refer to the above description.

[0075] In addition, although the first joining member (200-1) and the second joining member (200-2) are provided as a plurality of joining members (200) in FIGS. 6 to 8, and the first joining member (200-1) is selected for the first battery module (100-1) and the second joining member (200-2) is selected for the second battery module (100-2), the present invention is not limited thereto. In addition to the joining members (200) illustrated in FIGS. 6 to 8, joining members (200) of various shapes, structures, and types may be provided, and a battery module (100) corresponding thereto may be selected and applied to the present invention. In addition, it goes without saying that three or more types of pre-prepared joining members (200) may be provided and applied to the present invention.

[0076] Fig. 9 (a) illustrates a coupling member mounting portion provided in the pack housing of Fig. 1, and Fig. 9 (b) illustrates a pack fixing portion provided in the coupling member described above in Figs. 1 to 8.

[0077] Referring to (a) of Fig. 9, a pack housing (1100) is provided with a coupling member mounting portion (1200) to which a coupling member (200) can be mounted. Referring to (b) of Fig. 9, the coupling member (200) includes a pack fixing portion (220). The coupling between the pack housing of Fig. 1 and the coupling members described above in Figs. 1 to 8 is illustrated.

[0078] First, the coupling member (200) is coupled to the pack housing (1100). It may be coupled to the bottom surface of the pack housing (1100) or the side surface of the pack housing (1100), or it may be coupled to a cross beam (1110) that is provided as a component of the pack housing (1100) and divides the internal space of the pack housing (1100).

[0079] The pack fixing portion (220) of the coupling member (200) is coupled with the coupling member mounting portion (1200) of the pack housing (1100). To this end, the coupling member (200) includes at least one fastening hole (221) in the pack fixing portion (220), and the fastening hole (221) of the coupling member (200) corresponds to (matches) at least one fastening hole (221) of the pack fixing portion (220) of the pack housing (1100). In detail, the fastening hole (221) of the coupling member (200) and the fastening hole (1211) of the coupling member mounting portion (1200) of the pack housing (1100) may be connected in a row. Accordingly, the fastener can be fixed between the fastening member (200) and the pack housing (1100) by penetrating both the fastening hole (221) of the fastening member (200) and the fastening hole (1211) of the fastening member mounting portion (1200) of the pack housing (1100).

[0080] The battery module fixing portion (210) and the pack fixing portion (220) of the joining member (200) may be formed on different surfaces. The battery module (100) is coupled to the battery module fixing portion (210) of the joining member (200), and the pack housing (1100) is coupled to the pack fixing portion (220) of the joining member (200), thereby forming a coupling between the battery module (100) and the pack housing (1100). For example, in the embodiments of FIGS. 1 to 9, the battery module fixing portion (210) may be provided on the upper surface of the joining member (200), and the pack fixing portion (220) may be provided on the lower surface of the joining member (200). At this time, the pack fixing part (220) of the coupling member (200) is placed on the coupling member mounting part (1200) provided on the bottom surface of the pack housing (1100), thereby coupling between the pack housing (1100) and the coupling member (200), and then the coupling member mounting part (130) of the battery module (100) is placed on the battery module fixing part (210) of the coupling member (200), thereby coupling the battery module (100) to the coupling member (200).

[0081] Meanwhile, the coupling member mounting portion (1200) may include a step raised from the bottom surface of the pack housing (1100) as illustrated in FIG. 10, but the present invention is not limited thereto, and any location where the coupling member (200) can be mounted and coupled is sufficient. When the coupling member mounting portion (1200) includes a step raised from the bottom surface of the pack housing (1100), it is possible to more easily determine the location where the coupling member (200) should be placed on the pack housing (1100).

[0082] In the embodiment of FIG. 9, the case where two fastening holes (221) of the connecting member (200) and two fastening holes (1211) of the pack housing (1100) are provided and each is arranged asymmetrically and has a cross-section of the same size is exemplarily illustrated, but the present invention is not limited thereto, and various modifications and changes are possible for the fastening holes (221) of the connecting member (200) and the fastening holes (1211) of the pack housing (1100).

[0083] Meanwhile, according to an embodiment of the present invention, as exemplarily illustrated in FIGS. 6 to 8, a plurality of connecting members (200) are provided, including a first connecting member (200-1) and a second connecting member (200-2), and the first connecting member (200-1) is selected for the first battery module (100-1), and the second connecting member (200-2) is selected for the second battery module (100-2). At this time, as described above, the specification / model / type of the battery module fixing part (210) of the first connecting member (200-1) is different from the specification / model / type of the battery module fixing part (210) of the second connecting member (200-2).

[0084] However, the pack fixing portions (220) of each of the first connecting member (200-1) and the second connecting member (200-2) may all have the same specifications / model / type. For example, the size, position, number, shape, structure, and arrangement of the fastening holes (221) of the pack fixing portions (220) of each of the first connecting member (200-1) and the second connecting member (200-2) may all be the same regardless of the specifications / model / type of the battery module (100).

[0085] Accordingly, regardless of the various specifications / models / types of the battery modules (100) that constitute the battery pack (1000), even if only one pack housing (1100) is provided, battery modules (100) of various specifications / models / types can be selected to constitute the pack housing (1100). That is, there is an advantage in that the existing pack housing (1100) can be used as is even if the specifications / models / types of the battery modules (100) are changed. This brings about the effect of reducing the cost when manufacturing the battery pack (1000).

[0086] FIG. 10 and FIG. 11 are each a state diagram of use of the battery pack (1000) and the connecting member (200) described above in FIG. 1 to FIG. 9.

[0087] Referring to Fig. 10, a plurality of joining members (200) having specifications / models / types are provided in the joining member mounting portion (1200) of the pack housing (1100) of the battery pack (1000). In Fig. 10, a first joining member (200-1) and a second joining member (200-2) are illustrated as examples.

[0088] Fig. 11 (a) illustrates a case where a first coupling member (200-1) is coupled to a pack housing (1100), and Fig. 11 (b) illustrates a case where a second coupling member (200-2) is coupled to the pack housing (1100). Referring to Fig. 11, the coupling member (200) may be provided as a set with a coupling member (200') in which the fastening holes (131) are formed left-right symmetrically and / or up-down symmetrically. For example, the first coupling member (200-1) may be provided as a set with the first coupling member (200'-1) in which the fastening holes (131) are formed left-right symmetrically and / or up-down symmetrically, and the second coupling member (200-2) may be provided as a set with the second coupling member (200'-2) in which the fastening holes (131) are formed left-right symmetrically and / or up-down symmetrically. For example, the size, position, number, shape, structure, and arrangement of the fastening hole (131) of the connecting member (200') may be formed to be left-right symmetrical and / or up-down symmetrical with respect to the size, position, number, shape, structure, and arrangement of the fastening hole (131) of the connecting member (200).

[0089] Accordingly, when the position of the coupling member mounting portion (130) provided in the battery module (100), for example, the fastening hole (131) of the coupling member mounting portion (130) provided on the left and the fastening hole (131) of the coupling member mounting portion (130) provided on the right are formed left-right symmetrically with each other, the coupling member (200) and the coupling member (200') formed left-right symmetrically thereto can be respectively coupled accordingly. This can be applied in the same manner when the coupling member mounting portion (130) of the battery module (100) is formed up-down symmetrically and when the coupling member (200) is formed up-down symmetrically accordingly.

[0090]

[0091] Although not specifically mentioned above, the battery pack according to one embodiment of the present invention may additionally include a battery management system (BMS) and / or a cooling device that manages the temperature or voltage of the battery.

[0092] Additionally, the battery packs of the present invention may be connected to a battery management system (BMS, not shown). The BMS monitors and manages the battery pack(s). The BMS may be located on the uppermost layer of the stacked battery packs. However, the location of the BMS is not limited to the above-described location, and may be modified and changed in various ways to suit the method or environment in which the present invention is implemented.

[0093] Furthermore, the battery pack according to one embodiment of the present invention can be applied to various devices. For example, the devices to which the battery pack is applied may be means of transportation such as electric bicycles, electric vehicles, and hybrid vehicles. However, the above-described devices are not limited thereto, and the battery pack according to the present embodiment can be used in various devices other than the above-described examples, and this also falls within the scope of the present invention.

[0094] Additionally, the number of battery cells included in a battery module or the number of battery modules included in a battery pack may be determined in various ways depending on the output or capacity of the battery pack required for an electric vehicle or an energy storage system (ESS).

[0095] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

[0096] [Explanation of symbols]

[0097] 10: Battery cell stack

[0098] 100: Battery module

[0099] 110: Module housing

[0100] 120: End Plate

[0101] 130: Joint member mounting part

[0102] 131: Fastener

[0103] 200: Joining member

[0104] 210: Battery module fixing part

[0105] 211: Fastener

[0106] 220: Pack fixing part

[0107] 221: Fastener

[0108] 1100: Pack Housing

[0109] 1200: Joint member mounting part

[0110] 1211: Fastener

Claims

1. In the battery pack, A battery module comprising a battery cell stack in which a plurality of battery cells are stacked; A pack housing in which the battery module is mounted; and Including a coupling member including a pack fixing member that can be fixed between the pack housing and the coupling member and a battery module fixing member that can be fixed between the battery module and the coupling member, so as to be coupled between the battery module and the pack housing, A battery pack, wherein among a plurality of connecting members that can be connected to the pack housing, a connecting member suitable for the specifications of the battery module to be mounted on the pack housing is selected and connected to the battery module, and the specifications of the battery module fixing portion of each of the plurality of connecting members are provided to correspond to the specifications of the battery module that can be mounted on the pack housing.

2. In paragraph 1, The above battery module includes a coupling member mounting portion coupled to the coupling member, A battery pack, wherein the specifications of the battery module fixing portion of each of the plurality of connecting members are provided to correspond to the specifications of the connecting member mounting portion of the battery module that can be mounted on the pack housing.

3. In paragraph 2, A battery pack, wherein the battery module includes a module housing in which the battery cell stack is stored, and the bonding member mounting portion is provided in the module housing.

4. In paragraph 2, A battery pack, wherein the battery module includes an end plate that supports at least one side of the battery cell stack, and the bonding member mounting portion is provided on the end plate.

5. In paragraph 2, Each of the battery module fixing portion of the above-mentioned connecting member and the connecting member mounting portion of the battery module includes at least one fastening hole, and the fastening hole is inserted through the fastening hole of the battery module fixing portion of the above-mentioned connecting member and the fastening hole of the connecting member mounting portion of the battery module, thereby fixing the battery module and the connecting member between the above-mentioned connecting member, A battery pack, wherein the above specifications include at least one of the size, position, number, shape, structure, and arrangement of the fasteners.

6. In paragraph 5, A battery pack, wherein the fastening hole of the battery module fixing portion of the selected fastening member among the plurality of fastening members and the fastening hole of the fastening member mounting portion of the battery module are aligned in a row, and the fastening hole penetrates therethrough, thereby connecting the fastening member and the battery module.

7. In paragraph 5, A battery pack, wherein the size, position, number, shape, structure, and arrangement of the fastening holes of the battery module fixing portion of the selected fastening member among the plurality of fastening members are consistent with the size, position, number, shape, structure, and arrangement of the fastening holes of the fastening member mounting portion of the battery module.

8. In paragraph 5, A battery pack, wherein each of at least some of the plurality of connecting members has at least one different size, position, number, shape, structure, and arrangement of the fastening holes.

9. In paragraph 5, The battery module has a plurality of the above-described connecting member mounting portions, and includes the connecting member mounting portions on each of the facing sides of the battery module or includes the connecting member mounting portions on each of the corners of the battery module. A battery pack, wherein the above-mentioned connecting member mounting portion of the above-mentioned battery module and the above-mentioned battery module fixing portion of the above-mentioned connecting member are each provided in a plurality of sets.

10. In paragraph 1, The above pack housing includes a coupling member mounting portion on which the coupling member is mounted, A battery pack, wherein the specifications of the pack fixing portion of each of the plurality of connecting members are provided to correspond to the specifications of the connecting member mounting portion of the pack housing.

11. In paragraph 10, A battery pack in which the specifications of the pack fixing portion of each of the plurality of connecting members and the specifications of the connecting member mounting portion of the pack housing are all the same regardless of the specifications of the battery module.

12. In paragraph 10, Each of the pack fixing portion of the above-mentioned connecting member and the connecting member mounting portion of the pack housing includes at least one fastening hole, and a fastening hole is inserted through the fastening hole of the pack fixing portion of the above-mentioned connecting member and the fastening hole of the connecting member mounting portion of the pack housing, thereby being fixed between the connecting member and the pack housing. A battery pack, wherein the above specifications include at least one of the size, position, number, shape, structure, and arrangement of the fasteners.

13. In paragraph 10, A battery pack, wherein the fastening holes of the pack fixing portion of each of the plurality of connecting members and the fastening holes of the connecting member mounting portion of the pack housing are aligned in a row, and the connecting holes penetrate therethrough, thereby connecting the connecting members and the battery module.

14. In paragraph 10, A battery pack, wherein the size, position, number, shape, structure, and arrangement of the fastening holes of the pack fixing portion of each of the plurality of connecting members are consistent with the size, position, number, shape, structure, and arrangement of the fastening holes of the connecting member mounting portion of the pack housing.

15. In paragraph 10, A battery pack, wherein in the above-mentioned connecting member, the battery module fixing portion is located on a different surface from the surface where the pack fixing portion is located.

16. In paragraph 1, A battery pack further comprising a connecting member formed symmetrically left-right or up-down with the connecting member.

17. In paragraph 1, A battery pack, wherein the above-mentioned joining member and the pack housing are formed integrally.

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