Battery Module, Battery Pack Having the Same, and Vehicle

Abstract

The present invention discloses a battery module that secures appropriate bonding strength between internal components, reduces manufacturing costs, and improves manufacturing efficiency. To achieve the above objective, the battery module according to the present invention comprises: a plurality of battery cells; at least two module cases, each having an internal space that accommodates the plurality of battery cells and each having a coupling portion protruding toward one another, wherein the coupling portion of one module case is configured to be male-female coupled with the coupling portion of another module case; and a first adhesive configured to be interposed between the male-female coupled coupling portion of one module case and the coupling portion of another module case.

Description

Technology Field

[0001] The present invention relates to a battery module, a battery pack including the same, and an automobile, and more specifically, to a battery module, a battery pack including the same, and an automobile that secures appropriate coupling force between internal components, reduces manufacturing costs, and improves manufacturing efficiency. Background Technology

[0002] Recently, as the demand for portable electronic products such as laptops, video cameras, and mobile phones has increased rapidly, and the development of electric vehicles, energy storage batteries, robots, and satellites has accelerated, research on high-performance secondary batteries capable of repeated charging and discharging is actively underway.

[0003] Currently commercialized rechargeable batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium-ion batteries. Among these, lithium-ion batteries are gaining attention for their advantages, such as the ability to freely charge and discharge with almost no memory effect compared to nickel-based batteries, a very low self-discharge rate, and high energy density.

[0004] In addition, since the stability and operating efficiency of a battery module containing multiple such secondary battery cells are significantly compromised when these cells experience overvoltage, overcurrent, or overheating, a means to detect and control these issues is required. An example of such a configuration is a Battery Management System (BMS) equipped with various components.

[0005] At this time, when a battery module of the prior art is equipped with a plurality of module cases to accommodate a plurality of battery cells, it was common practice to assemble it using a plurality of fastening members, such as bolts and nuts, for joining between module cases or between a module case and an outer housing.

[0006] However, using such a large number of bolts and nuts can lead to increased material costs and added weight to the battery module, and has the disadvantage of requiring a significant amount of time for multiple bolting operations. The problem to be solved

[0007] Accordingly, the present invention is conceived to solve the above-mentioned problems and aims to provide a battery module that secures appropriate coupling strength between internal components, reduces manufacturing costs, and improves manufacturing efficiency, a battery pack including the same, and an automobile.

[0008] Other objects and advantages of the present invention may be understood from the following description and will become more clearly apparent from the embodiments of the present invention. Furthermore, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims. means of solving the problem

[0009] A battery module according to the present invention for achieving the above-mentioned purpose comprises: a plurality of battery cells; at least two module cases, each having an internal space for accommodating the plurality of battery cells and each having a coupling portion protruding toward one another, wherein the coupling portion of one module case is configured to be male-female coupled with the coupling portion of another module case; and a first adhesive configured to be interposed between the male-female coupled coupling portion of one module case and the coupling portion of another module case.

[0010] In addition, the connecting part of the other module case may have a column shape protruding outwardly from the outer wall of the one module case, and may have a hollow tube shape into which the column shape of the connecting part of the one module case is inserted.

[0011] In addition, the above-mentioned one module case is provided with a hook formed in the column shape of the coupling part, and the other module case may be provided with a fixing groove configured to be coupled with the hook inside the tube shape of the coupling part.

[0012] Furthermore, the coupling portion of the above-mentioned module case may have a plurality of receiving grooves formed to accommodate the first adhesive.

[0013] In addition, the joint portion of the above-mentioned module case may have a spiral groove formed that extends spirally along the outer surface of a column configured to accommodate the first adhesive.

[0014] Furthermore, each of the above at least two module cases may comprise a first frame configured to accommodate one side of the plurality of battery cells; and a second frame coupled to the first frame and configured to accommodate the other side of the plurality of battery cells.

[0015] And, among the above at least two module cases, one module case may be provided with a first coupling projection configured to be coupled with a second frame of the one module case on the first frame, a first protrusion configured to have a coupling groove into which the first coupling projection of the first frame is inserted and coupled on the second frame, and a second coupling projection configured to be coupled with a second frame of another module case.

[0016] Furthermore, the other module case may be provided with a first coupling projection configured to be coupled with a second frame of the other module case on the first frame, a first protrusion configured to be coupled with the first coupling projection of the other module case on the second frame, and a second protrusion configured to be coupled with the second coupling projection of the one module case on the second frame.

[0017] In addition, the first frame may be provided with a fitting groove so that the end of the first protrusion in the protruding direction of the second frame is fitted therein.

[0018] Furthermore, the first frame may be provided with a slit configured to allow the side of the first protrusion of the second frame to be inserted.

[0019] And, the battery pack of the present invention for achieving the above-mentioned purpose comprises at least one battery module.

[0020] Furthermore, the vehicle of the present invention for achieving the above-mentioned purpose includes at least one battery module. Effects of the invention

[0021] According to one aspect of the present invention, at least two module cases are provided with male and female connecting parts to each other so that they can be joined together, and furthermore, a first adhesive is provided interposed between the connecting parts, thereby allowing at least two module cases to be firmly joined. That is, the battery module of the present invention can bind the movement of the module cases to each other in the left-right and front-back directions through the configuration of the connecting parts and the first adhesive, thereby maintaining a stable fixed state. Accordingly, the durability of the battery module can be effectively increased.

[0022] Furthermore, compared to the prior art which uses bolt connections to join at least two module cases together, the present invention eliminates the need for bolt configuration, thereby reducing material costs and simplifying the joining process, which can effectively increase manufacturing efficiency.

[0023] In addition, according to one aspect of the present invention, the present invention can achieve a hook connection between a first frame of a module case and a second frame, that is, a connection between a first connecting projection and a connecting groove formed on a first protrusion, thereby eliminating the use of separate bolts and nuts, which can reduce material costs and effectively increase manufacturing efficiency through a simplified connection process.

[0024] Furthermore, the second frame of another module case is provided with a second protrusion configured to be coupled with the second frame of one module case, and the module case is provided with a second coupling projection that is coupled with the coupling groove of the second protrusion, thereby enabling mechanical coupling between one module case and another module case without using separate bolts, which can reduce material costs and effectively increase manufacturing efficiency through a simplified coupling process. Brief explanation of the drawing

[0025] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a front perspective view schematically showing the appearance of a battery module according to one embodiment of the present invention. FIG. 2 is a rear perspective view schematically showing the appearance of a battery module according to one embodiment of the present invention. FIG. 3 is a perspective view schematically showing the appearance of a module case, etc. of a battery module according to one embodiment of the present invention. FIG. 4 is an exploded perspective view schematically showing the appearance of some components of a battery module according to one embodiment of the present invention. FIG. 5 is a perspective view schematically showing the appearance of another module case, etc. of a battery module according to one embodiment of the present invention. FIG. 6 is an exploded perspective view schematically showing the appearance of some components of a battery module according to one embodiment of the present invention. FIG. 7 is a partial cross-sectional view schematically showing a part of a battery module cut along the CC' line of FIG. 1. FIG. 8 is a partial cross-sectional view schematically showing a part of a battery module according to another embodiment of the present invention. FIG. 9 is a partial cross-sectional view schematically showing a part of a battery module according to another embodiment of the present invention. FIG. 10 is a partial cross-sectional view schematically showing a part of a battery module according to another embodiment of the present invention. FIG. 11 is a partial enlarged view schematically showing the appearance of some components of a battery module according to yet another embodiment corresponding to area A of FIG. 3. Specific details for implementing the invention

[0026] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0027] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0029] FIG. 1 is a front perspective view schematically showing the appearance of a battery module according to an embodiment of the present invention. FIG. 2 is a rear perspective view schematically showing the appearance of a battery module according to an embodiment of the present invention. FIG. 3 is a perspective view schematically showing the appearance of one module case, etc. of a battery module according to an embodiment of the present invention. FIG. 4 is an exploded perspective view schematically showing the appearance of some components of a battery module according to an embodiment of the present invention. FIG. 5 is a perspective view schematically showing the appearance of another module case, etc. of a battery module according to an embodiment of the present invention. FIG. 6 is an exploded perspective view schematically showing the appearance of some components of a battery module according to an embodiment of the present invention. FIG. 7 is a partial cross-sectional view schematically showing a part of a battery module cut along the CC' line of FIG. 1.

[0030] Referring to FIGS. 1 to 7, a battery module (100) according to one embodiment of the present invention comprises a plurality of cylindrical battery cells (110), at least two module cases (141, 142), and a first adhesive (150).

[0031] Specifically, for example, as shown in FIGS. 3 and 4, the plurality of cylindrical battery cells (110) may have a battery can (116), and a positive terminal (111) and a negative terminal (112) formed on one side (right side, positive direction of X) of the body of the battery can (116). Conversely, the plurality of cylindrical battery cells (110) housed in another module case (142) of FIG. 6 may have a positive terminal (111) and a negative terminal (112) located on the other side (left side, negative direction of X in FIG. 1) of the body of the battery can (116).

[0032] Additionally, the positive terminal (111) may have an outer surface in the shape of a disc exposed to the outside. The negative terminal (112) may be an edge portion located at a spaced-apart position from the positive terminal (111). The positive terminal (111) and the negative terminal (112) may be positioned spaced apart by a predetermined distance. The positive terminal (111) and the negative terminal (112) may be configured to be electrically insulated from each other. Furthermore, the positive terminal (111) of the cylindrical battery cell (110) may have a larger outer surface area exposed to the outside than the negative terminal (112).

[0033] Furthermore, the cylindrical battery cell (110) may include an electrode assembly (not shown) that is electrically connected to each of the positive terminal (111) and the negative terminal (112) and is housed inside the battery can (116). Since the configurations of such cylindrical battery cell (110) are widely known to those skilled in the art at the time of filing of the present invention, a more detailed description is omitted in this specification.

[0034] Furthermore, the plurality of cylindrical battery cells (110) may be arranged in the vertical direction (Z-axis direction) and the horizontal direction (Y-axis direction). The plurality of cylindrical battery cells (110) may be arranged spaced apart at a predetermined interval. For example, as shown in FIG. 4, the plurality of cylindrical battery cells (110) may be arranged in the horizontal direction (Y-axis direction) and the horizontal direction (X-axis direction).

[0036] Additionally, at least two module cases (141, 142) may each have an internal space that accommodates a plurality of cylindrical battery cells (110) inside. The internal space may have an internal shape formed to surround the outer surface of the cylindrical battery cells (110).

[0037] Furthermore, the at least two module cases (141, 142) may be configured to be coupled to each other. For example, as shown in FIG. 1, one module case (141) (first module case) located on the left and another module case (142) (second module case) located on the right may be coupled to each other. To this end, the at least two module cases (141, 142) may each be provided with coupling portions (146p, 148p) that protrude toward each other. Among the at least two module cases (141, 142), the coupling portion (146p) of one module case (141) may have a shape that protrudes toward the coupling portion (148p) of the other module case (142). The coupling portion (148p) of the remaining other module case (142) may have a shape that protrudes toward the coupling portion (146p) of the one module case (141).

[0038] Additionally, the coupling portion (146p) of one module case (141) may be configured to be male-female coupled with the coupling portion (148p) of another module case (142). For example, as illustrated in FIG. 4, the battery module (100) may have two module cases (141, 142). Among the two module cases (141, 142), the module case (141) located on the left and the module case (142) located on the right may be coupled through the male-female coupling of the coupling portions (146p, 148p) formed on each. The module case (141) located on the left may be provided with multiple coupling portions (146p) protruding in the right direction. The other module case (142) located on the right may be provided with multiple coupling portions (148p) protruding in the left direction. The connecting part (146p) of one module case (141) located on the left and the connecting part (148p) of another module case (142) located on the right can be connected to each other in a male-female manner.

[0039] Referring again to FIG. 7 together with FIG. 1 and FIG. 3, the first adhesive (150) may be configured to be interposed between the connecting portion (146p) of one module case (141) that is male-female coupled and the connecting portion (148p) of another module case (142). For example, as shown in FIG. 7, the connecting portion (146p) of one module case (141) and the connecting portion (148p) of another module case (142) are male-female coupled to each other, and the first adhesive (150) may be interposed between the two connecting portions (146p, 148p).

[0040] For example, the first adhesive (150) may be a solidified adhesive. The adhesive (240) may have transparency and electrical insulation properties. The first adhesive (150) may be a glue or a hot-melt resin. For example, the first adhesive (150) may have at least one of a polyamide resin, a polyimide resin, an epoxy resin, and an acrylic resin.

[0041] Additionally, the first adhesive (150) may be applied to the empty space inside the joint portion (148p) of the other module case (142), after which the joint portion (146p) of the one module case (141) may be inserted into the empty space inside the joint portion (148p) of the other module case (142). During this insertion process, the first adhesive (150) may be interposed between the joint portion (146p) of the one module case (141) and the joint portion (148p) of the other module case (142).

[0042] Accordingly, according to this configuration of the present invention, the present invention is provided with a male-female coupling portion (146p, 148p) to each of at least two module cases (141, 142) so that they can be coupled to each other, and furthermore, by providing a first adhesive (150) interposed between the coupling portions (146p, 148p), at least two module cases (141, 142) can be firmly coupled. That is, the battery module (100) of the present invention can bind the module cases (141, 142) to each other's movement in the left-right and front-back directions through the configuration of the coupling portions (146p, 148p) and the first adhesive (150), thereby maintaining a stable fixed state. Accordingly, the durability of the battery module (100) can be effectively increased.

[0043] Furthermore, compared to the prior art which uses bolt connections to connect at least two module cases (141, 142) to each other, the present invention eliminates the need for bolt connections, thereby reducing material costs and simplifying the connection process, which can effectively increase manufacturing efficiency.

[0044] Referring again to FIGS. 3, 5, and 7, more specifically, the connecting portion (146p) of the one module case (141) may have a column shape protruding outward from the outer wall. The connecting portion (146p) of the one module case (141) may have a column shape to be inserted into the tubular interior of the connecting portion (148p) of the other module case (142). At this time, the column shape may be a cylindrical shape, a triangular prism shape, a square prism shape, or a pentagonal prism shape.

[0045] Additionally, the connecting portion (148p) of the other module case (142) may have an internal space size corresponding to the external shape of the connecting portion (146p) of the one module case (141). For example, the connecting portion (148p) of the other module case (142) may have a hollow tube shape with an internal space into which the column shape of the connecting portion (146p) of the one module case (141) is inserted. The connecting portion (148p) of the other module case (142) may have a circular tube, triangular tube, square tube, or pentagonal tube shape with one side closed.

[0046] For example, as illustrated in FIGS. 3, 5, and 7, one of the connecting portions (146p) of one module case (141) may have a square column shape. Among the connecting portions (148p) of another module case (142), the connecting portion (148p) corresponding to the square column-shaped connecting portion (146p) may have a square tube shape with one side closed. The connecting portion (146p) of one module case (141) may be inserted into the internal space of the square tube-shaped connecting portion (148p) of the other module case (142). At this time, the connecting portion (146p) of one module case (141) and the connecting portion (148p) of the other module case (142) may be bonded together by the first adhesive (150).

[0047] Accordingly, according to this configuration of the present invention, the coupling portion (146p) of one module case (141) has a column shape, and the coupling portion (148p) of another module case (142) has a tube shape, so that the two coupling portions (146p, 148p) can be joined to each other in a male-female manner. In addition, due to the shape of these coupling portions (146p, 148p), at least two module cases (141, 142) of the present invention can restrict movement in the left-right and up-down directions from each other, thereby maintaining a stable fixed state. Accordingly, the durability of the battery module (100) can be effectively increased.

[0048] FIG. 8 is a partial cross-sectional view schematically showing a part of a battery module according to another embodiment of the present invention.

[0049] Referring to FIG. 8, the coupling portions (146p1, 148p1) of the battery module according to another embodiment of the present invention may have a different shape from the coupling portions (146p, 148p) shown in FIG. 7. Other configurations are identical to the configurations of the battery module (100) shown in FIG. 1.

[0050] Specifically, in another embodiment of the present invention, at least two module cases (141A, 142A) of a battery module may have a hook (H) provided on a column-shaped coupling part (146p1) of one module case (141A). The hook (H) may have a protrusion shape protruding outwardly from the outer surface of the column-shaped coupling part (146p1). Additionally, a fixing groove (G1) capable of being coupled with the hook (H) may be provided on a tubular coupling part (148p1) of the other module case (142A). That is, the fixing groove (G1) may be formed in the tubular internal space of the coupling part (148p1). The fixing groove (G1) may be provided in a groove shape of a predetermined size so that the hook (H) can be hooked and mounted.

[0051] For example, as illustrated in FIG. 8, a coupling portion (148p1) provided in one module case (141A) of a battery module according to another embodiment of the present invention may be provided with two hooks (H). A coupling portion (148p) of another module case (142A) may be provided with two fixing grooves (G1) into which the two hooks (H) can be inserted and hooked.

[0052] Accordingly, according to this configuration of the present invention, the coupling portions (146p, 148p) provided in at least two module cases (141A, 142A) of a battery module (100) according to another embodiment of the present invention each have a hook (H) and a fixing groove (G1), so that mechanical fastening can be achieved between the two coupling portions (146p, 148p). Accordingly, a rigid connection can be achieved between at least two module cases (141A, 142A), thereby effectively increasing the durability of the battery module.

[0053] In the case of the present embodiment, the fastening force between at least two module cases (141A, 142A) can be further improved through the hook (H) and the fixing groove (G1) for the hook (H) to be mounted.

[0054] Accordingly, in this embodiment, by using a hook connection through the hook (H) and the fixing groove (G1) to connect at least two module cases (141A, 142A) to each other, a separate additional bolt or nut configuration is unnecessary compared to using a bolt connection, thereby reducing material costs and simplifying the connection process, so manufacturing efficiency can be effectively increased.

[0055] Therefore, in this embodiment, by not using separate bolts and nuts, material costs can be reduced, and manufacturing efficiency can be effectively increased through a simplified joining process.

[0056] FIG. 9 is a partial cross-sectional view schematically showing a part of a battery module according to another embodiment of the present invention.

[0057] Referring to FIG. 9, the coupling portion (146p2) of the battery module according to another embodiment of the present invention may have a different shape from the coupling portion (146p) shown in FIG. 7. Other components are identical to the components of the battery module (100) shown in FIG. 1.

[0058] Specifically, in at least two module cases (141B, 142B) of a battery module according to another embodiment of the present invention, the coupling portion (146p2) of one module case (141B) may have a plurality of receiving grooves (G2) formed to receive the first adhesive (150). For example, the receiving grooves (G2) may have a shape similar to a dimple formed on the surface of a golf ball.

[0059] For example, as illustrated in FIG. 9, when the coupling portion (146p2) of the one module case (141B) is inserted into the internal space of the tubular coupling portion (148p2) of the other module case (142B), the first adhesive (150) added to the internal space of the tubular coupling portion (148p2) can be received into the internal space of the receiving grooves (G2) of the other module case (142B). Accordingly, a sufficient amount of the first adhesive (150) can be received between the coupling portion (146p2) of the one module case (141B) and the coupling portion (148p2) of the other module case (142B).

[0060] Accordingly, according to this configuration of the present invention, the present invention forms a plurality of receiving grooves (G2) configured to receive the first adhesive (150) in the coupling portion (146p2) of one module case (141B), so that a sufficient amount of the first adhesive (150) can be received on the surface of the coupling portion, thereby effectively improving the bonding strength between the coupling portion (146p2) of the one module case (141B) and the coupling portion (148p2) of the other module case (142B). Accordingly, a robust bond can be achieved between at least two module cases (141B, 142B), thereby effectively increasing the durability of the battery module.

[0061] FIG. 10 is a partial cross-sectional view schematically showing a part of a battery module according to another embodiment of the present invention.

[0062] Referring to FIG. 10, the coupling portion (146p3) of the battery module according to another embodiment of the present invention may have a different shape from the coupling portion (146p) shown in FIG. 7. Other components are identical to the components of the battery module (100) shown in FIG. 1.

[0063] In another embodiment of the present invention, a connecting portion (146p3) of a battery module (141C) may have a spiral groove (G3) formed along the outer surface of a column configured to receive the first adhesive (150). When the connecting portion (146p3) of the one module case (141C) is inserted into the internal space of a tubular connecting portion (148p3) of another module case (142C), the spiral groove (G3) may be configured to receive the first adhesive (150) received in the internal space of the connecting portion (148p3) of the other module case (142C). The first adhesive (150) received in the spiral groove (G3) may harden to bind the connecting portion (146p3) of the one module case (141C) and the connecting portion (148p3) of the other module case (142C).

[0064] Accordingly, according to this configuration of the present invention, by forming a spiral groove (G3) in the coupling portion (146p3) of one module case (141C), the first adhesive (150) can be cured along the spiral groove (G3), thereby effectively preventing the force separating the coupling portion (146p3) of one module case (141C) inserted into the coupling portion (148p3) of another module case (142C) in the opposite direction of insertion. Accordingly, a strong connection can be achieved between at least two module cases (141C, 142C), thereby effectively increasing the durability of the battery module.

[0065] Referring again to FIGS. 1 to 6, each of at least two module cases (141, 142) of a battery module (100) according to one embodiment of the present invention may have a first frame (145, 147) and a second frame (146, 148). Specifically, the first frame (145) may be configured to accommodate one side of the plurality of cylindrical battery cells (110). The second frame (146) may be coupled to the first frame (145) and configured to accommodate the other side of the plurality of cylindrical battery cells (110).

[0066] For example, as illustrated in FIG. 4, a module case (141) located on the left may be provided with a first frame (145) configured to accommodate the left side of the plurality of cylindrical battery cells (110), and a second frame (146) coupled to the first frame (145) and configured to accommodate the right side of the plurality of cylindrical battery cells (110). At this time, a second adhesive (not visible) for fixing the plurality of cylindrical battery cells (110) may be filled inside the module case (141).

[0067] For example, as illustrated in FIG. 6, another module case (142) located on the right may be provided with a first frame (147) configured to accommodate the right side of the plurality of cylindrical battery cells (110), and a second frame (148) coupled to the first frame (147) and configured to accommodate the left side of the plurality of cylindrical battery cells (110). At this time, a second adhesive (not visible) for fixing the plurality of cylindrical battery cells (110) may be filled inside the other module case (142).

[0068] Additionally, among the at least two module cases (141, 142), one module case (141) may be provided with a first coupling projection (P1) on the first frame (145). The first coupling projection (P1) may be configured to be coupled with the second frame (146) of the one module case (141). For example, as shown in FIG. 4, four first coupling projections (P1) may be provided on the front of the first frame in the front-rear direction (Y direction). As shown in FIG. 2, four first coupling projections (P1) may also be provided on the rear of the first frame.

[0069] Additionally, the above-mentioned module case (141) may be provided with a first protrusion (E1) and a second coupling projection (P2) on the second frame (146). The first protrusion (E1) may be provided with a coupling groove (G4) configured to allow the first coupling projection (P1) of the first frame (145) of the above-mentioned module case (141) to be inserted and coupled. The first protrusion (E1) may have a shape that protrudes toward the first coupling projection (P1) of the first frame (145). The second coupling projection (P2) may be configured to be coupled with the second frame (148) of another module case (142). For example, as shown in FIG. 4, three first protrusions (E1) may be provided on the front of the second frame (146) of the above-mentioned module case (141). As shown in FIG. 2, three first protrusions (E1) may be provided on the rear surface of the second frame (146) of the module case (141).

[0070] Furthermore, as illustrated in FIG. 6, among the at least two module cases (141, 142), the other module case (142) may be provided with a first coupling projection (P1) on the first frame (147). The first coupling projection (P1) may be configured to be coupled with the second frame (148) of the other module case (142).

[0071] For example, as shown in FIG. 6, four first coupling protrusions (P1) may be provided on the front of the first frame (147) of another module case (142) located on the right. Also, as shown in FIG. 2, four first coupling protrusions (P1) may be provided on the rear of the second frame (148).

[0072] Additionally, the other module case (142) may be provided with a first protrusion (E1) and a second protrusion (E2) on the second frame (148) of the other module case (142). The first protrusion (E1) may be provided with a coupling groove (G4) configured to be coupled with a first coupling projection (P1) of the other module case (142). The second protrusion (E2) may be provided with a coupling groove (G4) configured to be coupled with the second coupling projection (P2) of the second frame (146) of the one module case (141).

[0073] For example, as shown in FIG. 6, four first protrusions (E1) may be provided on the front portion of the second frame (148) of the other module case (142). As shown in FIG. 2, four first protrusions (E1) may also be provided on the rear portion of the second frame of the other module case (142). Additionally, as shown in FIG. 6, three second protrusions (E2) may be provided on the front portion of the second frame (148) of the other module case (142). As shown in FIG. 2, three second protrusions (E2) may be provided on the rear portion of the second frame (148) of the other module case (142).

[0074] Accordingly, according to this configuration of the present invention, the present invention can achieve a hook connection between the first frame (145) of a module case (141) and the second frame (146), that is, a connection between the first connecting projection (P1) and the connecting groove (G4) formed on the first protrusion (E1), thereby eliminating the need for separate bolts, which can reduce material costs and effectively increase manufacturing efficiency through a simplified connection process. Furthermore, the second frame (148) of another module case (142) is provided with a second protrusion (E2) configured to be coupled with the second frame (146) of one module case (141), and the module case (141) is provided with a second coupling projection (P2) coupled with the coupling groove (G4) of the second protrusion (E2), thereby enabling mechanical coupling between one module case (141) and another module case (142) without using separate bolts, thus reducing material costs and effectively increasing manufacturing efficiency through a simplified coupling process.

[0075] FIG. 11 is a partial enlarged view schematically showing the appearance of some components of a battery module according to yet another embodiment corresponding to area A of FIG. 3.

[0076] Referring to FIG. 11 together with FIG. 3, the first frame (145) of a module case (141D) of a battery module according to yet another embodiment of the present invention may be further provided with a fitting groove (G5) such that the end of the first protrusion (E1) of the second frame (146) described above is fitted into it when compared to the module case (141) of FIG. 3. For example, the first frame (145) may be provided with three fitting grooves (G5) such that the ends of each of the three first protrusions (E1) are fitted into them. The fitting groove (G5) may be a part of the module case (141D) that protrudes from the outer surface in an L-shape.

[0077] Accordingly, according to this configuration of the present invention, the first frame (145) is provided with a fitting groove (G5) such that the end of the first protrusion (E1) of the second frame (146) in the protruding direction is fitted into it, thereby effectively preventing the first protrusion (E1) of the second frame (146) from spreading forward or backward and separating from the first coupling projection (P1) provided on the first frame (145). Accordingly, a stable connection can be achieved between the first frame (145) and the second frame (146) of a single module case (141D), thereby effectively increasing the durability of the battery module.

[0078] Meanwhile, referring again to FIG. 11 together with FIG. 3, the first frame (145) of a module case (141D) of a battery module according to another embodiment of the present invention may be provided with a slit (S) configured to allow the side of the first protrusion (E1) of the second frame to be inserted when compared to the module case (141) of FIG. 3. For example, as shown in FIG. 11, the first frame (145) may be provided with two slits (S). The two slits (S) may be configured to allow the upper and lower sides (Z-axis direction) of the first protrusion (E1) of the second frame (146) to be inserted, respectively. The slit (S) may be formed by inserting a part of the module case (141D) that protrudes outward from the outer surface. Here, the inserted shape may be a shape corresponding to the end of the first protrusion (E1).

[0079] Accordingly, according to this configuration of the present invention, the first frame (145) is provided with a slit (S) configured to allow the side of the first protrusion (E1) of the second frame (146) to be inserted, thereby guiding the direction of movement of the first protrusion (E1) of the second frame (146) toward the first coupling projection (P1) of the first frame (145). Furthermore, the first protrusion (E1) of the second frame (146) can be effectively prevented from spreading forward or backward and separating from the first coupling projection (P1) provided on the first frame (145). Accordingly, a stable connection can be achieved between the first frame (145) and the second frame (146) of a single module case (141D), thereby effectively increasing the durability of the battery module.

[0080] Meanwhile, referring again to FIGS. 4 and 6, the battery module (100) further includes a busbar (120) configured to electrically connect the plurality of cylindrical battery cells (110). The busbar (120) may be provided with an electrically conductive material. For example, the busbar (120) may be provided with at least one of a copper alloy, an aluminum alloy, and a nickel alloy. The busbar (120) may have a plate shape. The busbar (120) may have a shape in which a portion is bent at least once.

[0081] Additionally, the module case (141) may be equipped with the busbar (120) on its outer side. At this time, a third adhesive (not visible) may be interposed between the busbar (120) and the module case (141). For example, as shown in FIGS. 3 and 4, eight busbars (120) may be equipped on the right side of the module case (141). At this time, among the eight busbars (120), the busbars (120a, 120b) located at the top and bottom, respectively, may have a different shape from the remaining six busbars (120). Furthermore, the busbars (120) located at the top and bottom, respectively, may be configured to electrically connect only the positive terminal (111) or negative terminal (112) of a plurality of cylindrical battery cells (110). The remaining six busbars (120) will be described in more detail later.

[0082] Meanwhile, referring again to FIGS. 3 and 4, each of the at least two types of connecting members (130) may be provided with an electrically conductive material. For example, the connecting member (130) may be provided with at least one of a copper alloy, an aluminum alloy, and a nickel alloy. The connecting member (130) may have a body that is elongated. In other words, the connecting member (130) may have a body that is elongated in a strip shape or a wire shape. One end of the connecting member (130) in the direction in which the body is extended may be joined to the bus bar (120). Additionally, one end of the connecting member (130) may be welded to the outer surface of the bus bar (120). For example, the welding method may be ultrasonic welding.

[0083] Additionally, the other end of the connecting member (130) may be joined to either the positive terminal (111) or the negative terminal (112). At this time, the other end of the connecting member (130) may be welded to the outer surface of the positive terminal (111) or the negative terminal (112). For example, the welding method may be ultrasonic welding.

[0084] Additionally, the above at least two types of connecting members (130) may include a first connecting member (131) connected to the negative terminal (112) and a second connecting member (132) connected to the positive terminal (111). For example, as shown in FIG. 3, one end of the first connecting member (131) may be connected to the bus bar (120) and the other end may be connected to the negative terminal (112) of the cylindrical battery cell (110). One end of the second connecting member (132) may be connected to the bus bar (120) and the other end may be connected to the positive terminal (111) of the cylindrical battery cell (110).

[0085] The first connecting member (131) may have a wire shape that is extended in the longitudinal direction. For example, as shown in FIG. 3, one end of the wire shape of the first connecting member (131) may be joined to the bus bar (120). The other end of the wire shape of the first connecting member (131) may be joined to the negative terminal (112). Since the wire shape has a narrow diameter and is extended in the longitudinal direction, the first connecting member (131) has a shape optimized for joining to the negative terminal (112), which has a narrow outer surface exposed to the outside compared to the positive terminal (111).

[0086] The second connecting member (132) may have a strap shape (strip shape) that is extended in the longitudinal direction. For example, as shown in FIG. 3, one end of the strap shape of the second connecting member (132) may be joined to the bus bar (120). The other end of the strap shape of the second connecting member (132) may be joined to the positive terminal (111). The second connecting member (132) may have a plate shape that is rectangular in planar shape. One side of the other end of the second connecting member (132) facing the positive terminal (111) may be joined to the outer surface of the positive terminal (111). One side of the one end of the second connecting member (132) facing the bus bar (120) may be joined to the outer surface of the bus bar (120).

[0087] Accordingly, according to this configuration of the present invention, the present invention includes a bus bar (120) and at least two types of connecting members (130) having different connecting areas depending on the terminal being connected among the positive terminal (111) and the negative terminal (112), thereby optimizing the connecting area between the connecting member (130) and the positive terminal (111) or the negative terminal (112).

[0088] That is, compared to a configuration in which a busbar (120) is connected to the positive terminal (111) or negative terminal (112) using a single type of connecting member (130) of the prior art, the present invention allows at least two types of connecting members (130) to have different connection areas depending on the type of terminal to which they are joined. Accordingly, the present invention can effectively reduce the separation of the connected portion between the connecting member (130) and the positive terminal (111) or negative terminal (112) even when the battery module (100) is mounted in an environment where frequent vibrations and shocks occur, such as in a vehicle. Ultimately, the durability of the battery module (100) can be effectively improved.

[0089] Meanwhile, referring to FIG. 1, a battery pack according to one embodiment of the present invention may include at least one battery module (100) and a battery management system (BMS, 160) electrically connected to a busbar (120) of the battery module (100). The BMS (160) may be equipped with various circuits or components to control the charging and discharging of the plurality of battery cells.

[0090] Meanwhile, a vehicle (not otherwise shown) according to one embodiment of the present invention may include at least one battery module (100) and a receiving space for accommodating the battery module (100). For example, the vehicle may be an electric vehicle, an electric scooter, an electric wheelchair, or an electric bike.

[0091] Meanwhile, although terms indicating directions such as up, down, left, right, front, and back have been used in this specification, these terms are used merely for convenience of explanation, and it is obvious to those skilled in the art that they may vary depending on the location of the object or the position of the observer.

[0093] As described above, although the present invention has been explained by limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims set forth below by those skilled in the art to which the present invention pertains.

Claims

Claim 1 A battery module comprising: a plurality of battery cells; at least two module cases, each having an internal space for accommodating the plurality of battery cells and each having a coupling portion protruding toward each other, wherein the coupling portion of one module case is configured to be male-female coupled with the coupling portion of another module case; and a first adhesive configured to be interposed between the male-female coupled coupling portion of one module case and the coupling portion of another module case, wherein the first adhesive contacts the coupling portion of the one module case and the coupling portion of the other module case on at least two surfaces. Claim 2 A battery module according to claim 1, characterized in that it has a column shape protruding outwardly from the outer wall of one module case, and the connecting part of the other module case has a hollow tube shape into which the column shape of the connecting part of the one module case is inserted. Claim 3 A battery module characterized in that, in paragraph 2, one module case is provided with a hook formed in the column shape of the coupling part, and the other module case is provided with a fixing groove configured to be coupled with the hook inside the tube shape of the coupling part. Claim 4 A battery module according to paragraph 2, wherein the coupling portion of the module case is characterized by having a plurality of receiving grooves formed to accommodate the first adhesive. Claim 5 A battery module according to paragraph 2, wherein the coupling portion of the module case is characterized by having a spiral groove formed that extends spirally along the outer surface of a column configured to accommodate the first adhesive. Claim 6 A battery module according to claim 1, wherein each of the at least two module cases comprises: a first frame configured to accommodate one side of the plurality of battery cells; and a second frame coupled to the first frame and configured to accommodate the other side of the plurality of battery cells. Claim 7 A battery module according to claim 6, wherein, among the at least two module cases, one module case is provided with a first coupling projection configured to be coupled with a second frame of the one module case on the first frame, a first protrusion provided with a coupling groove configured to be inserted and coupled with the first coupling projection of the first frame on the second frame, and a second coupling projection configured to be coupled with the second frame of another module case, and the other module case is provided with a first coupling projection configured to be coupled with the second frame of the other module case on the first frame, a first protrusion provided with a coupling groove configured to be coupled with the first coupling projection of the other module case on the second frame, and a second protrusion provided with a coupling groove configured to be coupled with the second coupling projection of the one module case on the second frame. Claim 8 A battery module according to claim 7, wherein the first frame is provided with a fitting groove so that the end of the first protrusion in the protruding direction of the second frame is fitted therein. Claim 9 A battery module according to claim 7, wherein the first frame is provided with a slit configured to allow the side of the first protrusion of the second frame to be inserted. Claim 10 A battery pack characterized by including at least one battery module according to any one of claims 1 to 9. Claim 11 An automobile characterized by including a battery module according to any one of claims 1 to 9.

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