Battery pack

Abstract

The disclosed invention relates to a battery pack, which in one example includes a base plate, side plates coupled along the edge of the base plate to form an accommodation space therein, a cross beam coupled to the base plate to horizontally divide the accommodation space inside the base plate, and a plurality of battery cell assemblies mounted in the accommodation space divided by the cross beam, wherein the battery cell assemblies have side frames fixed to the cross beam, and the side frames of adjacent battery cell assemblies along the vertical direction share the upper surface of the cross beam located therebetween and do not overlap each other vertically.

Description

Technical Field

[0001] The present invention relates to a battery pack, and more particularly, to a battery pack that can extend its lifespan through minimal maintenance without having to discard the entire battery pack by enabling replacement of some of the plurality of battery cells mounted in the battery pack when a problem occurs with those battery cells.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0046089 filed on April 7, 2023, and all the contents disclosed in the literature of the Korean patent application are included as part of this specification.

Background Art

[0003] In order to increase the space utilization rate of a battery pack, a battery pack having a cell-to-pack structure has been proposed. The cell-to-pack structure has the advantage of being able to improve the space utilization rate of the battery pack by directly assembling a plurality of battery cells into the battery pack without modularizing them.

[0004] In the cell-to-pack structure, a new structure has been proposed for efficiently mounting a large number of battery cells in a pack case by omitting or simplifying a separate module housing. For example, it can be designed in a structure where side frames are coupled to a battery cell assembly (corresponding to a conventional battery module) in which a plurality of battery cells form a group, and the side frames of the battery cell assembly are fixed to the cross beams of the pack case.

[0005] Alternatively, the side frames of adjacent battery cell assemblies can be overlapped vertically and secured to the base plate to substitute for the role of a pack crossbeam (meaning a crossbeam provided in the pack case). Furthermore, by interposing thermal resin between the bottom surface of the battery cell assembly where the battery cells are exposed and the base plate of the pack case, conductive heat dissipation from the battery cell assembly can be promoted, and the battery cell assembly can be more firmly secured through the curing of the thermal resin.

[0006] Incidentally, a battery pack structure that utilizes the side frame of the battery cell assembly to omit the pack crossbeam configuration and further secures the battery cell assembly through the curing of thermal resin has many advantages in terms of cell-to-pack structure, such as improving the space utilization rate of the battery pack by immediately assembling multiple battery cells into a battery pack without a modular structure, but it comes with disadvantages in terms of battery pack maintenance. In other words, such a cell-to-pack structure makes it extremely difficult to disassemble a battery pack down to the battery cell assembly unit once it has been assembled.

[0007] For example, in a cell-to-pack structure where the side frames of adjacent battery cell assemblies overlap vertically and are fixed to a base plate, disassembly is only possible by removing the battery cell assemblies one by one in the reverse order of assembly. Furthermore, in structures where the bottom surface of the battery cell assembly is fixed through the curing of thermal resin, removing the battery cell assembly can cause damage to the battery cells bonded to the thermal resin, potentially leading to dangerous consequences such as electrolyte leakage.

[0008] There is a strong need to develop a cell-to-pack battery pack that can be easily disassembled down to the individual battery cells. This allows for maintenance of the battery pack by replacing only one battery cell if a problem occurs in that cell, thereby enabling the use of expensive battery packs for their entire designed lifespan without having to discard them. [Overview of the project] [Problems that the invention aims to solve]

[0009] The present invention aims to provide a battery pack with a cell-to-pack structure that allows any battery cell assembly to be easily removed regardless of the assembly order, thereby facilitating the replacement of any problematic battery cells.

[0010] However, the technical problems that the present invention aims to solve are not limited to those described above, and other problems not mentioned can be clearly understood by an ordinary person of the art from the description of the invention below. [Means for solving the problem]

[0011] The present invention relates to a battery pack, which in one example includes a base plate, a side plate coupled along the edge of the base plate and forming a housing space inside it, a cross beam coupled to the base plate so as to laterally partition the housing space inside the base plate, and a plurality of battery cell assemblies mounted in the housing space partitioned by the cross beam, wherein the battery cell assemblies have side frames fixed to the cross beam, and the side frames of adjacent battery cell assemblies along the longitudinal direction share the upper surface of the cross beam located between them and do not overlap each other vertically.

[0012] In one embodiment, the side frame includes a side plate surrounding the side of the battery cell assembly and support blocks protruding from the side plate, wherein the support blocks of adjacent battery cell assemblies along the longitudinal direction occupy areas on the upper surface of the crossbeam that do not overlap with each other.

[0013] The above-mentioned side frame comprises a plurality of support blocks arranged spaced apart from each other, and the plurality of support blocks of adjacent battery cell assemblies along the longitudinal direction may be arranged alternately with respect to the upper surface of the crossbeam.

[0014] The battery cell assembly can then be fixed to the crossbeam by bolts that are supported by passing vertically through the support block.

[0015] Depending on the embodiment, a center beam may be further included that is connected to the base plate so as to vertically partition the accommodation space inside the base plate, thereby allowing the accommodation space to be arranged in a grid pattern by the cross beam and the center beam.

[0016] On the other hand, depending on the embodiment of the present invention, the invention may further include clip bands that are coupled to the side plates of the side frame so as to support the bottom surfaces of the plurality of battery cells that make up the battery cell assembly.

[0017] The clip band includes a band body that supports the bottom surfaces of the plurality of battery cells, and fastening portions that are bent and raised at both ends of the band body, the fastening portions being equipped with a snap pin that has been cut and bent, and the side plate of the side frame may be equipped with a snap groove into which the snap pin engages.

[0018] The snap pin is angled downward with respect to the side plate, and the fastening between the clip band and the side frame can form a snap-fit ​​structure that will not be separated by the load of the multiple battery cells.

[0019] Furthermore, grooves are provided on the side surface of the crossbeam, and the fastening portion of the clip band can be inserted into these grooves.

[0020] Furthermore, a paste-like gap filler is interposed at the contact surface between the bottom surface of the battery cell assembly and the base plate, and the paste-like gap filler may be made of a non-curing material.

[0021] On the other hand, the present invention provides a method for manufacturing a battery pack, comprising: a first step of preparing a pack case including a base plate, a side plate coupled along the edge of the base plate and forming a storage space inside it, and a cross beam coupled to the base plate so as to laterally partition the storage space inside the base plate; a second step of inserting a clip band into a groove formed on the side of the cross beam; and a third step of mounting one battery cell assembly each in a plurality of storage spaces partitioned by the cross beam.

[0022] The process may further include a second-first step of applying a paste-like gap filler onto the base plate after the second step described above, wherein the paste-like gap filler may be a non-curing material.

[0023] Furthermore, the battery cell assembly includes a side frame fixed to the crossbeam, and the side frames of adjacent battery cell assemblies along the longitudinal direction share the upper surface of the crossbeam located between them, and do not overlap each other vertically.

[0024] For example, the side frame includes a side plate surrounding the side of the battery cell assembly and support blocks protruding from the side plate, and the support blocks of adjacent battery cell assemblies along the longitudinal direction may occupy areas on the upper surface of the crossbeam that do not overlap with each other.

[0025] And the third step may be that the battery cell assembly is fixed to the cross beam by bolts that pass vertically through and are supported by the support block.

[0026] The clip band includes a band body that supports the bottom surfaces of the plurality of battery cells, and fastening portions that are bent and erected at both ends of the band body. The fastening portions include snap pins that are cut and bent. The side plate of the side frame may include snap grooves into which the snap pins engage.

[0027] And the snap pin is inclined downward with respect to the side plate, and the fastening between the clip band and the side frame may form a snap fit structure that is not separated by the load of the plurality of battery cells. Thereby, when the battery cell assembly is removed, the clip band can support the bottom surfaces of the plurality of battery cells that make up the battery cell assembly.

Advantages of the Invention

[0028] In the battery pack of the present invention having the above-described configuration, the side frames of adjacent battery cell assemblies with the cross beam interposed therebetween are fixed to the cross beam. The side frames of each battery cell assembly share the upper surface of one cross beam but do not overlap vertically with each other. Thus, even if a problem occurs in only one of the battery cells in the assembled battery pack, it is possible to easily remove only the battery cell assembly that is the problem regardless of the assembly order, and by replacing the battery cell, maintenance of the battery pack becomes possible, so that an expensive battery pack can be utilized up to its designed life without being discarded.

[0029] Furthermore, if a gap filler is interposed at the contact surface between the bottom surface of the battery cell assembly and the base plate, the gap filler may be a non-curing paste-like gap filler. The non-curing gap filler eliminates the risk of damage to the battery cells due to hardened gap filler when the battery cell assembly is removed, thereby allowing for the free replacement of the problematic battery cell.

[0030] However, the technical effects that can be obtained by the present invention are not limited to those described above, and other effects not mentioned can be clearly understood by an ordinary person of the art from the description of the invention below.

[0031] The following drawings accompanying this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention described below, serve to further illustrate the technical concept of the present invention. Therefore, the present invention should not be construed as being limited solely to the matters described in such drawings. [Brief explanation of the drawing]

[0032] [Figure 1] This is a perspective view of the battery pack according to the present invention. [Figure 2] This is a diagram showing the packaging case. [Figure 3] This is a drawing showing a battery cell assembly with a crossbeam in between. [Figure 4] Figure 1 is a plan view of the battery pack. [Figure 5] This is a diagram showing the structure in which a clip band is placed on the pack case. [Figure 6] This drawing shows the structure in which a clip band engages with a battery cell assembly. [Figure 7] This is a cross-sectional view showing a structure in which a battery cell assembly is secured to a clip band placed on a pack case. [Figure 8] This is a diagram showing the structure in which the battery cell assembly is mounted along the vertical direction of the pack case. [Figure 9] This is a diagram showing a structure for removing one of the battery cell assemblies from a pack case. [Modes for carrying out the invention]

[0033] The present invention can be modified in various ways and may have a variety of embodiments; therefore, specific embodiments will be described in detail below.

[0034] However, this is not intended to limit the present invention to any particular embodiment, but rather should be understood to include all modifications, equivalents, or substitutions that fall within the spirit and technical scope of the present invention.

[0035] In the present invention, terms such as "includes" and "have" are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof as described in the specification, and do not preemptively exclude the presence or possibility of adding one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0036] Furthermore, in this invention, when a part such as a layer, film, region, or plate is described as being "on top" of another part, this includes not only the case where it is "directly on top" of the other part, but also the case where another part is located in between. Conversely, when a part such as a layer, film, region, or plate is described as being "below" another part, this includes not only the case where it is "directly below" the other part, but also the case where another part is located in between. Also, in this application, being "on top" may include being located not only at the top but also at the bottom.

[0037] The present invention relates to a battery pack, which in one example includes a base plate, a side plate coupled along the edge of the base plate and forming a housing space inside it, a cross beam coupled to the base plate so as to laterally partition the housing space inside the base plate, and a plurality of battery cell assemblies mounted in the housing space partitioned by the cross beam, wherein the battery cell assemblies have side frames fixed to the cross beam, and the side frames of adjacent battery cell assemblies along the longitudinal direction share the upper surface of the cross beam located between them and do not overlap each other vertically.

[0038] Furthermore, the paste-like gap filler interposed at the contact surface between the bottom surface of the battery cell assembly and the base plate may be made of a non-curing material.

[0039] In this battery pack of the present invention, the side frames of each adjacent battery cell assembly, with a crossbeam in between, are fixed to the crossbeam, although the side frames of each battery cell assembly share the top surface of one crossbeam, but do not overlap each other vertically.

[0040] This allows for easy removal of only the problematic battery cell assembly, regardless of the assembly order, even if a problem occurs in only one battery cell within an assembled battery pack. By replacing the problematic battery cell, the battery pack can be maintained, allowing expensive battery packs to be used for their designed lifespan without being discarded.

[0041] In this case, if a gap filler is interposed at the contact surface between the bottom surface of the battery cell assembly and the base plate, the gap filler may be a non-curing paste-like gap filler. The non-curing gap filler eliminates the risk of damage to the battery cells due to hardened gap filler when the battery cell assembly is removed, thereby allowing for the free replacement of the problematic battery cell.

[0042] Hereinafter, specific embodiments of the battery pack 10 according to the present invention will be described in detail with reference to the attached drawings. For reference, the forward / backward and up / down / left / right directions used in the following description to specify relative positions are for the purpose of aiding the understanding of the invention, and unless otherwise defined, the directions shown in the drawings shall be used as the reference.

[0043] (First Embodiment) Figure 1 is a perspective view of the battery pack 10 according to the present invention, Figure 2 is a drawing showing the pack case 100, and Figure 3 is a drawing showing the battery cell assembly 200 with a crossbeam 130 in between.

[0044] Referring to Figures 1 to 3, the pack case 100 that forms the main body of the battery pack 10 includes a base plate 110, a side plate 120 that is coupled along the edge of the base plate 110 and forms a storage space inside it, and a cross beam 130 that is coupled to the base plate 110 so as to divide the storage space inside the base plate 110 horizontally. Depending on the embodiment, as shown in attached Figure 2, a center beam 140 that is coupled to the base plate 110 so as to divide the storage space inside the base plate 110 vertically may be included, thereby allowing the storage space of the pack case 100 to be arranged in a grid pattern by the cross beam 130 and the center beam 140.

[0045] Each housing space partitioned by the crossbeam 130 houses one battery cell assembly 200, so that the battery pack 10 can accommodate multiple battery cell assemblies 200 to meet the design capacity. Referring to Figure 3, the battery cell assembly 200 includes multiple battery cells 210 and a busbar frame assembly 220 that mechanically and electrically connects to the multiple battery cells 210 at both lateral ends where the leads (not shown) of the battery cells 210 protrude. The battery cell assembly 200 also includes side frames 230 on both longitudinal sides to protect the battery cells 210.

[0046] Figure 4 is a plan view of the battery pack 10, and when viewed together with Figure 3, the side frames 230 of adjacent battery cell assemblies 200 along the vertical direction share the upper surface of the crossbeam 130 located between them and do not overlap each other vertically. For example, in the illustrated embodiment, the side frame 230 includes a side plate 232 surrounding the side of the battery cell assembly 200 and a support block 236 protruding from the side plate 232, and the support blocks 236 of adjacent battery cell assemblies 200 along the vertical direction occupy areas on the upper surface of the crossbeam 130 that do not overlap each other.

[0047] To describe the side frame 230 of the battery cell assembly 200 in more detail, the support block 236 of the side frame 230 is a protruding member for supporting and fixing the battery cell assembly 200 to the cross beam 130, and the battery cell assembly 200 is supported by the support block 236 being fixed to the upper surface of the cross beam 130. Furthermore, the battery cell assembly 200 is fixed to the cross beam 130 by bolts 240 that penetrate vertically through the support block 236, and the fastening force of the bolts 240 acts on the battery cell assembly 200 by the head of the bolt 240, which has a larger diameter, being supported at the entrance of the through hole 238. Here, as shown in Figure 3, the entrance of the through hole 238 may be positioned below the upper surface of the support block 236 so that the head of the bolt 240 is not led out to the outside.

[0048] Figure 4 shows the structure in which the entire battery cell assembly 200 is mounted within the battery pack 10. Adjacent battery cell assemblies 200 along the longitudinal direction, separated by a crossbeam 130, are each supported and fixed while sharing the crossbeam 130 between them. For this reason, the support blocks 236 of adjacent battery cell assemblies 200 along the longitudinal direction occupy areas on the upper surface of the crossbeam 130 that do not overlap with each other. For example, multiple support blocks 236 of adjacent battery cell assemblies 200 along the longitudinal direction may be arranged alternately with respect to the upper surface of the crossbeam 130.

[0049] As shown in the plan view of Figure 4, the side frames 230, particularly the support blocks 236, of adjacent battery cell assemblies 200 with a crossbeam 130 in between, share the top surface of one crossbeam 130 but do not overlap each other vertically. This allows only the problematic battery cell assembly 200 to be easily removed upward without any interference, regardless of the assembly order, even if a problem occurs in only one battery cell 210 within the assembled battery pack 10. Thus, the battery pack 10 of the present invention allows for maintenance of the battery pack 10 through the replacement of the problematic battery cell 210 or battery cell assembly 200, enabling the use of the expensive battery pack 10 to its designed lifespan without having to discard the entire unit.

[0050] Furthermore, depending on the embodiment, a gap filler may be interposed at the contact surface between the bottom surface of the battery cell assembly 200 and the base plate 110. The gap filler plays a role in promoting heat conduction between the two by filling the gap (caused by surface roughness, flatness, etc.) that exists between the bottom surface of the battery cell assembly 200 and the base plate 110, and has a thermal conductivity of a certain level or higher for smooth heat conduction.

[0051] In the battery pack 10 of the present invention, it is preferable to use a non-hardening, paste-like gap filler 150 as the gap filler. For example, the paste-like gap filler 150 used in the present invention may have the property of not hardening for a long period of time, including the lifespan or service warranty period of the battery pack 10, despite the passage of time and temperature fluctuations due to repeated charging and discharging. Such a non-hardening gap filler eliminates the risk of damage to the battery cells 210 due to hardened gap filler when the battery cell assembly 200 is removed, thereby ensuring that the problematic battery cell 210 can be freely replaced. An example of such a paste-like gap filler 150 is the "TGF 3010 APS" gap filler from Henkel AG&Co.KGaA, headquartered in Düsseldorf, Germany.

[0052] (Second Embodiment) A second embodiment of the present invention relates to a battery pack 10 that includes a configuration to assist in stably withdrawing a heavy battery cell assembly 200 when removing a battery cell assembly 200 containing a problematic battery cell 210.

[0053] The battery pack 10 according to the second embodiment further includes clip bands 300 that connect to side plates 232 of a side frame 230 so as to support the bottom surfaces of the plurality of battery cells 210 that make up the battery cell assembly 200. The clip bands 300 that maintain the bonded state to the side frame 230 support the bottom surface of the plurality of battery cells 210 that make up the battery cell assembly 200, thereby preventing problems such as the battery cells 210 separating and falling even if the battery cell assembly 200 detaches from the base plate 110.

[0054] In particular, the battery pack 10 of the present invention is also suitable for configuration as a cell-to-pack structure battery pack 10 in which the structure of the battery cell assembly 200 is simplified, without a separate module housing surrounding the multiple battery cells 210, and the clip band 300 can be said to be a configuration that is useful for maintenance of the cell-to-pack structure battery pack 10.

[0055] Figure 5 is a diagram showing the structure in which the clip band 300 is placed on the pack case 100, and Figure 6 is a diagram showing the structure in which the clip band 300 is fastened to the battery cell assembly 200. The clip band 300 in the illustrated embodiment includes a band body 310 that supports the bottom surfaces of multiple battery cells, and fastening portions 320 that are bent and raised at both ends of the band body 310. The clip band 300 is fixed to the battery cell assembly 200 by fastening the fastening portions 320 at both ends to the side frame 230.

[0056] As shown in Figure 5, the clip band 300 is attached to the pack case 100, but it can be configured so that when the battery cell assembly 200 is placed inside the pack case 100, the clip band 300 is automatically fastened to the side frame 230 of the battery cell assembly 200. By providing the clip band 300 as an integral part of the pack case 100, the manufacturing process of the pack case 100 can be unified and completed separately from the process of preparing the battery cell assembly 200. Another advantage is that since there is no need to apply gap filler to the clip band 300, it is possible to save on the gap filler, which is expensive in the area occupied by the clip band 300 on the base plate 110.

[0057] When the battery cell assembly 200 is placed inside the pack case 100, the clip band 300 is automatically fastened to the side frame 230 of the battery cell assembly 200. Furthermore, when the battery cell assembly 200 is removed, the fastened state of the clip band 300 is maintained. As shown in Figure 6, the fastening portions 320 at both ends of the clip band 300 are provided with snap pins 322 that are cut into a U shape and then bent inward. Correspondingly, the side plate 232 of the side frame 230 may be provided with snap grooves 234 into which the snap pins 322 engage.

[0058] Figure 7 is a cross-sectional view showing the structure in which a battery cell assembly 200 is fastened to a clip band 300 placed on a pack case 100. The battery cell assembly 200 on the left side of Figure 7 is in the state of being attached to the pack case 100, but the snap pin 322 of the fastening portion 320 is inclined downward with respect to the side plate 232, so the snap pin 322, which is pressed by the side plate 232 of the battery cell assembly 200 that is moving downward, will naturally enter the snap groove 234 while undergoing elastic deformation.

[0059] Conversely, in the case of the battery cell assembly 200 already mounted on the pack case 100 on the right side of Figure 7, when an upward pulling force is applied, the free end of the downward-angled snap pin 322 contacts the wall surface of the snap groove 234 and resists, causing the battery cell assembly 200 to detach from the base plate 110 while the fastening state of the clip band 300 remains unchanged. In other words, the fastening between the clip band 300 and the side frame 230 can be described as a snap-fit ​​structure that fastens automatically under downward load and is not separated by the load of multiple battery cells.

[0060] Furthermore, in order to ensure that the clip band 300 is precisely positioned in a predetermined location on the pack case 100, a groove 132 may be provided on the side of the crossbeam 130, as shown in Figure 5, and the fastening portion 320 of the clip band 300 may be inserted into the groove 132.

[0061] (Third embodiment) In a third embodiment of the present invention, a method for manufacturing the battery pack 10 described above will be explained.

[0062] The manufacturing method for the battery pack 10 according to the present invention includes a first step of preparing a pack case 100 as shown in Figure 2, which includes a base plate 110, a side plate 120 that is coupled along the edge of the base plate 110 and forms a housing space inside it, and a cross beam 130 that is coupled to the base plate 110 so as to laterally partition the housing space inside the base plate.

[0063] Then, in the second step, as shown in Figure 5, the pack case 100 and the clip band 300 are prepared as a single unit by inserting the clip band 300 into the groove 132 formed on the side of the crossbeam 130.

[0064] Here, the process may further include a second-first step of applying a paste-like gap filler 150 onto the base plate 110 after the second step. The paste-like gap filler 150 may be applied to the base plate 110 that is exposed while avoiding the clip band 300, and it is preferable that the paste-like gap filler 150 is made of a material that does not harden for a sufficiently long period of time.

[0065] In the third step, one battery cell assembly 200 is mounted in each of the multiple housing spaces partitioned by the crossbeam 130. Each mounted battery cell assembly 200 has a side frame 230 fixed to the crossbeam 130, and the side frames 230 of adjacent battery cell assemblies 200 along the vertical direction share the upper surface of the crossbeam 130 located between them, and do not overlap each other vertically. As a result, as shown in Figures 8 and 9, the battery pack 10 of the present invention does not require a specific mounting order for the multiple battery cell assemblies 200, and furthermore, when removing any battery cell assembly 200, only that battery cell assembly 200 can be released from its fixed state and pulled upward.

[0066] In one embodiment, the side frame 230 includes a side plate 232 surrounding the side of the battery cell assembly 200 and support blocks 236 protruding from the side plate 232, wherein the support blocks 236 of adjacent battery cell assemblies 200 along the longitudinal direction may occupy areas on the upper surface of the crossbeam 130 that do not overlap with each other. Then, in the third step, the individual battery cell assemblies 200 may be fixed to the crossbeam 130 by bolts 240 that are supported by passing vertically through the support blocks 236.

[0067] The clip band 300 includes a band body 310 that supports the bottom surfaces of multiple battery cells, and fastening portions 320 that are bent and raised at both ends of the band body 310, the fastening portions 320 having a cut and bent snap pin 322, and the side plate 232 of the side frame 230 may have a snap groove 234 into which the snap pin 322 engages.

[0068] Furthermore, the snap pin 322 is inclined downward with respect to the side plate 232, and the fastening between the clip band 300 and the side frame 230 can form a snap-fit ​​structure that will not be separated by the load of the multiple battery cells. As a result, the clip band 300 can support the bottom surfaces of the multiple battery cells 210 that make up the battery cell assembly 200 when the battery cell assembly 200 is removed.

[0069] The present invention has been described in more detail above through the drawings and embodiments. However, the configurations described in the drawings or embodiments described herein are merely one embodiment of the present invention and do not represent the entire technical concept of the present invention. Therefore, there may be various equivalents and modifications that can substitute for them at the time of filing. [Explanation of Symbols]

[0070] 10: Battery Pack 100: Pack Case 110: Base plate 120: Side Plate 130: Crossbeam 132: Groove 140: Center beam 150: Paste-type gap filler 200: Battery cell assembly 210: Battery cell 220: Busbar frame assembly 230: Side frame 232: Side plate 234: Snap groove 236: Support Block 238: Through Hole 240: Bolt 300: Clip band 310: Band body 320: Binding part 322: Snap pin

Claims

1. base plate and A side plate is joined along the edge of the base plate and forms a storage space inside it, A cross beam is connected to the base plate so as to laterally partition the internal storage space of the base plate, Multiple battery cell assemblies are mounted in the housing space partitioned by the aforementioned crossbeam, Includes, The battery cell assembly comprises a side frame fixed to the crossbeam, The side frames of adjacent battery cell assemblies along the vertical direction share the upper surface of the crossbeam located between them, and do not overlap each other vertically. The side frame includes a side plate that surrounds the side of the battery cell assembly. The assembly further includes clip bands that connect to the side plates of the side frame to support the bottom surfaces of the plurality of battery cells making up the battery cell assembly, The aforementioned clip band is The band includes a band body that supports the bottom surfaces of the plurality of battery cells, and fastening portions that are bent and raised at both ends of the band body, the fastening portions being equipped with snap pins that have been cut and bent. The side plate of the side frame is provided with a snap groove into which the snap pin engages, in the battery pack.

2. The aforementioned side frame is The system further includes a support block protruding from the side plate, The battery pack according to claim 1, wherein the support blocks of adjacent battery cell assemblies along the vertical direction occupy areas on the upper surface of the crossbeam that do not overlap with each other.

3. The aforementioned side frame comprises a plurality of support blocks arranged at a distance from each other, The battery pack according to claim 2, wherein a plurality of support blocks of adjacent battery cell assemblies along the longitudinal direction are arranged alternately with respect to the upper surface of the crossbeam.

4. The aforementioned battery cell assembly is The battery pack according to claim 2, which is fixed to the crossbeam by bolts that are supported by vertically penetrating the support block.

5. The system further includes a center beam connected to the base plate so as to vertically partition the internal storage space of the base plate, The battery pack according to claim 1, wherein the housing spaces are arranged in a grid pattern by the cross beam and the center beam.

6. The snap pin is inclined downward with respect to the side plate. The battery pack according to claim 5, wherein the fastening between the clip band and the side frame forms a snap-fit ​​structure that is not separated by the load of the plurality of battery cells.

7. The side surface of the aforementioned crossbeam is provided with a groove, The battery pack according to claim 5, wherein the fastening portion of the clip band is inserted into the groove.

8. A paste-like gap filler is interposed at the contact surface between the bottom surface of the battery cell assembly and the base plate. The battery pack according to claim 1, wherein the paste-like gap filler is made of a non-hardening material.

9. A first step is to prepare a pack case that includes a base plate, a side plate that is joined along the edge of the base plate and forms a storage space inside it, and a cross beam that is joined to the base plate so as to laterally partition the storage space inside the base plate, The second step is to insert the clip band into a groove formed on the side surface of the crossbeam, The third step includes mounting one battery cell assembly in each of the multiple housing spaces partitioned by the cross beam, The battery cell assembly comprises a side frame fixed to the crossbeam, The aforementioned clip band is The assembly includes a band body that supports the bottom surfaces of multiple battery cells forming the aforementioned battery cell assembly, and fastening portions that are bent and raised at both ends of the band body, the fastening portions being equipped with snap pins that have been cut open and bent. A method for manufacturing a battery pack, wherein the side plate of the side frame is provided with a snap groove into which the snap pin engages.

10. After the second step described above, The second-first step further includes applying a paste-like gap filler onto the base plate, The method for manufacturing a battery pack according to claim 9, wherein the paste-like gap filler is made of a non-hardening material.

11. The battery cell assembly comprises a side frame fixed to the crossbeam, The method for manufacturing a battery pack according to claim 9, wherein the side frames of adjacent battery cell assemblies along the vertical direction share the upper surface of the cross beam located between them and do not overlap each other vertically.

12. The aforementioned side frame is The battery cell assembly includes a side plate surrounding the side and a support block protruding from the side plate, The method for manufacturing a battery pack according to claim 11, wherein the support blocks of adjacent battery cell assemblies along the vertical direction occupy areas on the upper surface of the crossbeam that do not overlap with each other.

13. The previous third step is, The method for manufacturing a battery pack according to claim 12, wherein the battery cell assembly is fixed to the cross beam by bolts that are supported by vertically penetrating the support block.

14. The snap pin is inclined downward with respect to the side plate. The fastening between the clip band and the side frame is a snap-fit ​​structure that is not separated by the load of the multiple battery cells. As a result, the clip band supports the bottom surfaces of the plurality of battery cells making up the battery cell assembly when the battery cell assembly is removed, the method for manufacturing a battery pack according to claim 13.

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