Battery pack

Abstract

The present disclosure relates to a battery pack including: a battery cell unit including a plurality of battery cells; a bottom plate supporting a bottom surface of the battery cell unit; and a battery cell unit fixing agent interposed between the battery cell unit and the base plate, the battery cell unit fixing agent including a structural adhesive applied to or in contact with a portion of a bottom surface of the battery cell unit, and a non-curable filler, the non-curable filler is applied to or in contact with the remaining portion of the bottom surface of the battery cell unit; and a battery cell lower plate interposed between the bottom plate and the battery cell unit fixing agent, removably fastened to the bottom plate, adhered to and fixed to the battery cell unit by a structural adhesive.

Description

Technical Field

[0001] This application claims the benefit of priority of Korean Patent Application No. 10-2023-0094962, filed on Jul. 21, 2023, the disclosure of which is incorporated herein by reference.

[0002] The present disclosure relates to a battery pack, and more particularly, to a battery pack adapted to extend the service life of the battery pack with minimal maintenance by enabling replacement of a portion of a plurality of battery cells installed in the battery pack without discarding the entire battery pack when a problem occurs. Background Art

[0003] In order to improve the space utilization of the battery pack, a battery pack with a cell-to-pack structure is proposed. The cell-to-pack structure has the advantage of improving the space utilization of the battery pack by directly assembling a plurality of battery cells into the battery pack without modularization.

[0004] Since the module-free structure omits or simplifies the separate module housing, a new structure is proposed to effectively install multiple battery cells to the battery pack housing. For example, a battery cell unit (equivalent to a traditional battery module) formed by a group of multiple battery cells can be combined with a side frame, and can be designed as a structure in which the side frame of the battery cell unit is fixed to the crossbeam of the battery pack housing.

[0005] Alternatively, the side frames of adjacent battery cell units may overlap and be fixed to the bottom plate from top to bottom to serve as a battery pack crossbeam (referring to a crossbeam provided in the battery pack housing). In addition, a thermal resin may be interposed between the bottom surface of the battery cell unit where the battery cell is exposed and the bottom plate of the battery pack housing to facilitate conduction heat dissipation of the battery cell unit, and the battery cell unit may be further fixed by curing the thermal resin.

[0006] However, for the module-free structure, the battery pack structure that omits the configuration of the battery pack cross beam by utilizing the side frame of the battery cell unit and further fixes the battery cell unit by curing the thermal resin has many advantages, such as improving the space utilization of the battery pack by directly assembling multiple battery cells into the battery pack without modularization, but it has disadvantages in terms of maintenance of the battery pack. In other words, such a module-free structure makes it difficult to disassemble the battery pack to the battery cell level once assembled.

[0007] For example, a module-less structure in which the side frames of adjacent battery cell units are stacked and fixed to a bottom plate can be disassembled only by removing the battery cell units one by one in the reverse order of assembly. In addition, when removing the battery cell units, a structure that fixes the bottom surface of the battery cell units by curing the thermal resin may damage the battery cells bonded to the thermal resin, which may lead to quite dangerous consequences such as electrolyte leakage.

[0008] Therefore, it is highly desirable to develop a battery pack having a module-free structure that can be easily disassembled into battery cell units, so that if only one battery cell in the battery pack fails, the battery pack can be maintained by replacing that battery cell, thereby avoiding the need to discard the expensive battery pack and using the battery pack within its designed service life.

[0009] Public Content

[0010] Technical issues

[0011] The present disclosure is directed to providing a battery pack having a module-free structure, in which any battery cell unit can be easily removed regardless of the assembly order, thereby facilitating replacement of a faulty battery cell.

[0012] However, the technical problems that the present disclosure attempts to solve are not limited to the above problems, and those skilled in the art can clearly understand other problems not mentioned from the detailed description of the present disclosure below.

[0013] Technical Solution

[0014] The present disclosure relates to a battery pack. In one example, the battery pack includes: a battery cell unit, which includes a plurality of battery cells; a bottom plate, which supports the bottom surface of the battery cell unit; a battery cell unit fixer, which is interposed between the battery cell unit and the bottom plate, and the battery cell unit fixer includes a structural adhesive and a non-curing filler, the structural adhesive is applied to or contacts a portion of the bottom surface of the battery cell unit, and the non-curing filler is applied to or contacts the rest of the bottom surface of the battery cell unit; and a battery cell lower plate, which is interposed between the bottom plate and the battery cell unit fixer, is removably fastened to the bottom plate, and is adhered and fixed to the battery cell unit by the structural adhesive.

[0015] In one embodiment of the present disclosure, the structural adhesive may not occupy any area outside of the battery cell lower plate.

[0016] In addition, the battery cell lower plate includes a main body in which the structural adhesive is inserted and stud bolts extending from the main body, wherein the stud bolts may be fixed with nuts through through holes formed in the bottom plate.

[0017] The upper surface of the bottom plate may be provided with a concave surface including a through hole, wherein the main body of the battery cell lower plate may be accommodated in the concave surface.

[0018] Furthermore, an upper surface of the body received in the concave surface may coincide with an upper surface of the bottom plate.

[0019] The bottom surface of the bottom plate may be provided with a groove for accommodating the nut so that the nut does not protrude outward and a tool can enter.

[0020] According to an embodiment of the present disclosure, a cooling plate may be combined with the bottom surface of the base plate, wherein stud bolts and nuts are located in an area of ​​the cooling plate where no flow path is formed.

[0021] Furthermore, the structural adhesive forms a curable adhesive layer, and the non-curable filler forms a non-curable adhesive layer.

[0022] Therefore, as the fastening of the stud bolts and nuts is released, the fixed state of the battery cell unit with respect to the bottom plate is released, and is taken out to the outside of the battery pack together with the battery cell lower plates bonded to each other by the structural adhesive.

[0023] The battery cell fixative may be provided with non-curing fillers on both sides of the structural adhesive.

[0024] Beneficial Effects

[0025] In the disclosed battery pack having the above configuration, the structural adhesive forming the semi-permanent adhesive surface firmly fixes the bottom plate and the battery cell unit via the battery cell lower plate, but by ensuring the detachable state of the battery cell lower plate and the bottom plate, the structural adhesive does not hinder the removal of the battery cell unit. Therefore, even if the battery cell unit is firmly fixed to the bottom plate by the solid curable adhesive layer formed by the structural adhesive on a part of the bottom surface of the battery cell unit, the battery cell unit in the battery pack of the present disclosure can be easily removed through the battery cell lower plate.

[0026] In addition, in the battery pack of the present disclosure, the side frames of the battery cell units are bolted to the upper surface of the cross beam to fix the battery cell units in the lateral direction, wherein the side frames of adjacent battery cell units do not overlap each other on the cross beam. Therefore, when removing a faulty battery cell unit, it is not necessary to remove other adjacent battery cell units first, thereby simplifying the removal of the battery cell units.

[0027] However, the technical effects of the present disclosure are not limited to the above-mentioned effects, and a person skilled in the art may clearly understand other effects not mentioned from the description of the present disclosure set forth below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following drawings attached to this specification illustrate preferred exemplary embodiments of the present disclosure and are intended to be used for further understanding of the technical ideas of the present disclosure in conjunction with the following detailed description of the present disclosure, and thus the present disclosure should not be construed as being limited to the contents shown in these drawings.

[0029] Figure 1 is a diagram illustrating a fixing structure of a battery cell unit in a battery pack according to the present disclosure.

[0030] Figure 2 It is along Figure 1 Cross-sectional view of the “AA” line cut.

[0031] Figure 3 is shown removed from the battery pack Figure 2 Figure 2. A diagram of a battery cell in FIG.

[0032] Figure 4 It is a diagram showing a battery cell lower plate.

[0033] Figure 5 It is a diagram showing the bottom surface of the battery pack.

[0034] Figure 6 2 is a diagram showing an embodiment in which a battery pack is provided with a cooling plate.

[0035] Figure 7 and Figure 8 2 is a diagram showing an assembly process of a battery pack according to the present disclosure. DETAILED DESCRIPTION

[0036] The present disclosure may have various modifications and various embodiments, so specific embodiments thereof will be described in detail below.

[0037] However, it should be understood that the present disclosure is not limited to the specific embodiments, and includes all modifications, equivalents, or substitutes within the spirit and technical scope of the present disclosure.

[0038] The terms "include", "comprising" and "having" as used herein indicate the presence of features, numbers, steps, actions, parts or components or a combination thereof described in the specification. It should be understood that the presence or possibility of adding one or more other features, numbers, steps, actions, parts, components or a combination thereof are not excluded in advance.

[0039] Furthermore, in the present disclosure, when a portion of a layer, film, region, plate, etc. is disposed “on” another portion, this includes not only a case where one portion is “directly” disposed “on” another portion, but also a case where another portion is interposed between the portion and the other portion. In contrast, when a portion of a layer, film, region, plate, etc. is disposed “below” another portion, this includes not only a case where one portion is “directly” disposed “below” another portion, but also a case where another portion is interposed between the portion and the other portion. Furthermore, in the present application, “on…” may include not only a case where it is disposed on an upper portion, but also a case where it is disposed on a lower portion.

[0040] The present disclosure relates to a battery pack. In one example, the battery pack includes: a battery cell unit, which includes a plurality of battery cells; a bottom plate, which supports the bottom surface of the battery cell unit; a battery cell unit fixer, which is interposed between the battery cell unit and the bottom plate, and the battery cell unit fixer includes a structural adhesive and a non-curing filler, the structural adhesive is applied to or contacts a portion of the bottom surface of the battery cell unit, and the non-curing filler is applied to or contacts the rest of the bottom surface of the battery cell unit; and a battery cell lower plate, which is interposed between the bottom plate and the battery cell unit fixer, is removably fastened to the bottom plate, and is adhered and fixed to the battery cell unit by the structural adhesive.

[0041] The structural adhesive forms a curable adhesive layer and the non-curable filler forms a non-curable adhesive layer, whereby the battery cell lower plate not fixed to the bottom plate and the battery cell unit bonded to each other by the structural adhesive can be taken out of the battery pack together.

[0042] The battery pack of the present disclosure has the above-mentioned configuration, wherein the adhesion for fixing the battery cell unit to the bottom plate is provided by both a structural adhesive and a non-curing filler, wherein the curing structural adhesive is locally adhered to the bottom surface of the battery cell unit, and the structural adhesive is inserted in a battery cell lower plate that can be removed from the bottom plate, so that the battery cell unit and the battery cell lower plate with the structural adhesive inserted can be taken out of the battery pack together.

[0043] That is, by limiting the area where the curable structural adhesive of the battery cell lower plate is inserted, it is easier to separate a faulty battery cell unit from the battery pack and replace only the faulty battery cell unit, allowing the entire battery pack to be reused rather than discarded.

[0044] [Embodiments of the present disclosure]

[0045] Hereinafter, with reference to the accompanying drawings, a specific embodiment of the battery pack 10 according to the present disclosure will be described in detail. As a reference, the front-rear, up-down, and left-right directions used to designate relative positions in the following description are intended to help understand the present disclosure, and unless otherwise defined, these directions refer to the directions shown in the drawings.

[0046] [First embodiment]

[0047] Figure 1 is a diagram showing a fixing structure of a battery cell unit 200 in a battery pack 10 according to the present disclosure, Figure 2 It is along Figure 1 Section view cut along line "AA" in the figure.

[0048] The present disclosure relates to a battery pack 10, which includes a battery pack housing 100 and a plurality of battery cell units 200 installed in the battery pack housing 100. As used herein, the battery cell unit 200 refers to a group formed by a plurality of battery cells 210, and includes a structure for making the plurality of battery cells 210 into a unit. For example, the battery cell unit 200 may be provided with a bus bar frame assembly 220 and a side frame 230, the bus bar frame assembly 220 mechanically and electrically combined with the battery cell 210 at two lateral ends where the leads (not shown) of the battery cell 210 protrude, and the side frame 230 protects the battery cell 210 on two longitudinal sides. Therefore, in the battery cell unit 200, a plurality of battery cells 210 are arranged in a row in an upright position along the thickness direction thereof. In addition, the battery cell unit 200 shown is suitable for a battery pack 10 having a module-free structure, wherein the battery cell 210 is exposed on its bottom surface without any additional structure.

[0049] The battery pack housing 100 includes a bottom plate 110 as a bottom plate. The bottom plate 110 supports the bottom surface of the battery cell unit 200, that is, the bottom surface of the plurality of battery cells 210, and is used to absorb heat from the bottom surface of the battery cell unit 200 in a heat conduction manner and dissipate the heat to the outside. In order to dissipate the absorbed heat to the outside via a coolant, the bottom plate 110 itself may have a heat sink built therein, or a separate cooling plate 150 may be bonded to its bottom surface.

[0050] The battery pack housing 100 may further include a side plate 120 and a cross beam 130, the side plate 120 is coupled along the periphery of the bottom plate 110 to form a receiving space therein, and the cross beam 130 is coupled to the bottom plate 110 to laterally divide the receiving space inside the bottom plate 110. According to an embodiment, the battery pack housing 100 may further include an intermediate beam 140, which longitudinally divides the receiving space inside the bottom plate 110, so that the receiving space of the battery pack housing 100 is arranged in a grid through the cross beam 130 and the intermediate beam 140, as shown in the attached Figure 1 shown.

[0051] The fixing structure for mounting the plurality of battery monomer units 200 on the bottom plate 110 includes a battery monomer unit fixing agent 300 interposed between the battery monomer unit 200 and the bottom plate 110, and the battery monomer unit fixing agent 300 includes two types: a structural adhesive 310 and a non-curing filler 320. Although the structural adhesive 310 and the non-curing filler 320 have in common that they have high thermal conductivity to achieve better heat dissipation, they have significant differences in terms of adhesiveness or curability.

[0052] The structural adhesive 310 is a battery cell fixing agent 300 that forms a curable adhesive layer 312 between the bottom plate 110 and the battery cell 200. For example, a curable thermal resin can be applied as the structural adhesive 310. The thermal resin has the characteristics of a viscous gel when applied, but cures into a hard solid after being exposed to air for a period of time. As a result of the curing of the thermal resin, the bottom surface of the battery cell 200 is firmly fixed to the bottom plate 110.

[0053] On the other hand, the non-curing filler 320 is a battery cell fixing agent 300 that forms a non-curing adhesive layer 322 between the base plate 110 and the battery cell 200. Although repeated charging and discharging may cause the passage of time and temperature fluctuations, the non-curing adhesive layer 322 will not cure during the service life of the battery pack 10 or the extended warranty period. The non-curing filler 320 plays two roles as an adhesive and a buffer, and the adhesiveness of the non-curing filler 320 is much weaker than that of the structural adhesive 310. Therefore, in the process of separating the battery cell 200 from the base plate 110, the non-curing filler 320 does not act as an obstacle. As the non-curing filler 320, for example, a gap filler with the trade name "TGF 3010 APS" of Henkel AG & Co. KGaA, Düsseldorf, Germany can be applied.

[0054] In addition, the battery pack 10 of the present disclosure includes a battery cell lower plate 400, which can ensure that the battery cell unit 200 is smoothly separated from the battery pack housing 100. The battery cell lower plate 400 is inserted between the bottom plate 110 and the battery cell unit fixing agent 300. More specifically, the battery cell lower plate 400 is inserted between the bottom plate 110 and the structural adhesive 310. The battery cell lower plate 400 is fastened so that it can be separated from the bottom plate 110, and the structural adhesive 310 is adhered to the upper surface of the battery cell lower plate 400. Therefore, the battery cell lower plate 400 is adhered and fixed to the battery cell unit 200 by the structural adhesive 310. At the same time, the battery cell lower plate 400 can be fixed to the bottom plate 110 or can be detachable relative to the bottom plate 110.

[0055] Figure 3 1 is a diagram showing the removal of the battery cell unit 200 from the battery pack 10. Before the battery cell unit 200 is stored in the battery pack case 100, the battery cell lower plate 400 is combined with and fixed to the bottom plate 110. Figure 2 As shown, the battery cell unit 200 is adhered and fixed to the bottom plate 110 by the battery cell unit fixing agent 300. In the battery cell unit fixing agent 300, the cured structural adhesive 310 semi-permanently fixes the battery cell unit 200 in place, and the non-curing filler 320 adhered to the remaining area of ​​the bottom surface of the battery cell unit 200 fixes the battery cell unit 200 by adhesion, so that the bonding surfaces can be separated when an appropriate force is applied.

[0056] like Figure 3 As shown, in the fixing structure of the battery cell unit 200, when the battery cell unit 200 is removed upward after the fastening state of the battery cell lower plate 400 relative to the bottom plate 110 is released, the battery cell lower plate 400 adhered by the structural adhesive 310 remains adhered to the battery cell unit 200, and the area of ​​the non-curing filler 320 with weak adhesion is separated from the adhesive surface. Therefore, the battery cell unit 200 is taken out to the outside of the battery pack case 100 with the battery cell lower plate 400 still adhered to its bottom surface.

[0057] In other words, the structural adhesive 310 forming a semi-permanent adhesive surface firmly fixes the bottom plate 110 and the battery cell unit 200 via the battery cell lower plate 400, but the curable adhesive layer 312 formed by the structural adhesive 310 does not hinder the removal of the battery cell unit 200 because the battery cell lower plate 400 and the bottom plate 110 are in a detachable state. In addition, since an appropriate traction force is applied when removing the battery cell unit 200, the non-curable adhesive layer 322 formed by the non-curable filler 320 does not hinder the removal of the battery cell unit 200. Therefore, the battery pack 10 of the present disclosure facilitates the removal of the battery cell unit 200 through the battery cell lower plate 400, even if the battery cell unit 200 is firmly fixed to the bottom plate 110 by the strong curable adhesive layer 312 formed by the structural adhesive 310 on a portion of the bottom surface of the battery cell unit 200.

[0058] In order to smoothly remove the battery cell unit 200, preferably, the structural adhesive 310 does not occupy the area outside the battery cell lower plate 400. That is, without inserting the battery cell lower plate 400, the structural adhesive 310 does not form a curable adhesive layer 312 between the bottom plate 110 and the battery cell unit 200, which is conducive to removing the battery cell unit 200. In addition, preferably, the curable adhesive layer 312 and the non-curable adhesive layer 322 can be arranged in a balanced manner so that a uniform adhesive force is applied to the battery cell unit 200. To this end, the battery cell unit fixer 300 can be configured so that the non-curable filler 320 is arranged on both sides of the structural adhesive 310 located in the middle.

[0059] For the battery cell fixing agent 300, the bottom surface of the battery cell unit 200 may contact the battery cell fixing agent 300 after the battery cell fixing agent 300 is applied to the bottom plate 110 and the battery cell lower plate 400, or the battery cell fixing agent 300 may be directly applied to the bottom surface of the battery cell unit 200. However, since the battery cell lower plate 400 is a boundary between the area of ​​the curable adhesive layer 312 and the area of ​​the non-curable adhesive layer 322, it may be more advantageous to apply the battery cell fixing agent 300 on the bottom plate 110 to which the battery cell lower plate 400 is mounted from the viewpoint of process control.

[0060] Figure 4 4 is a diagram showing a battery cell lower plate 400. Figure 5 1 is a diagram showing the bottom surface of the battery pack 10. In the illustrated embodiment, the battery cell lower plate 400 includes a body 410 in which the structural adhesive 310 is inserted and a stud bolt 420 extending from the body 410. The stud bolt 420 extending downward from the battery cell lower plate 400 passes through a through hole 112 formed in the bottom plate 110 and is fixed with a nut 430. If the bottom plate 110 includes a radiator, that is, if a flow path (not shown) for a coolant to flow through is formed inside the bottom plate 110, the through hole 112 needs to be formed at a position avoiding the flow path.

[0061] In addition, in order to form a uniform bonding surface, preferably, the battery cell lower plate 400 and the bottom plate 110 form a flat surface without protrusions. To this end, the upper surface of the bottom plate 110 is provided with a concave surface 114 including a through hole 112, and the main body 410 of the battery cell lower plate 400 is accommodated in the concave surface 114. The upper surface of the main body 410 accommodated in the concave surface 114 is aligned with the upper surface of the bottom plate 110, thereby achieving uniform surface contact with the bottom surface of the battery cell unit 200.

[0062] In addition, if Figure 5As shown, the bottom surface of the bottom plate 110 may be provided with a groove 116, which accommodates the nut 430 fastened to the stud bolt 420 of the battery cell lower plate 400 so that the nut 430 does not protrude outward. By accommodating the nut 430 in the groove 116, the bottom surface of the bottom plate 110 is flat to prevent interference with the installation of the battery pack 10, and also reduce the possibility of the nut 430 being loosened or damaged. In addition, preferably, the size (diameter) of the groove 116 is formed to a size that can be entered by a tool to facilitate the fastening and separation process of the battery cell lower plate 400.

[0063] Figure 6 1 is a diagram showing an embodiment in which the battery pack 10 of the present disclosure is provided with a cooling plate 150. A flow path 152 for the coolant to flow through is formed inside the cooling plate 150. The low-temperature coolant introduced at the inlet flows along the flow path 152, absorbs the heat generated by the battery monomer unit 200 mounted on the base plate 110 in a conductive manner, and the coolant whose temperature gradually increases by absorbing the heat is discharged through the outlet. As described above, the heat-conductive battery monomer unit fixing agent 300 inserted between the battery monomer unit 200 and the base plate 110 (including the battery monomer lower plate) facilitates the heat dissipation of the battery monomer unit 200.

[0064] Since the battery cell lower plate 400 is fastened by the bottom plate 110, when the cooling plate 150 is bonded to the bottom surface of the bottom plate 110, the stud bolts 420 of the battery cell lower plate 400 should integrally pass through the bottom plate 110 and the cooling plate 150 and be fastened to the nuts 430. In this case, preferably, the stud bolts 420 and the nuts 430 are located in the area of ​​the cooling plate 150 where the flow path 152 is not formed to prevent the coolant from leaking out and not hinder the flow of the coolant.

[0065] [Second embodiment]

[0066] The second embodiment of the present disclosure describes an assembly process of the above-mentioned battery pack 10 . Figure 7 and Figure 8 2 is a diagram showing an assembly process of the battery pack 10 according to the present disclosure.

[0067] First, a battery pack case 100 for mounting a battery cell unit 200 is prepared. The battery pack case 100 may include a bottom plate 110, side plates 120 coupled along the periphery of the bottom plate 110 to form a receiving space therein, and a cross beam 130 and a middle beam 140, which partition the receiving space inside the bottom plate 110 transversely and longitudinally. Each receiving space partitioned by the side plate 120, the cross beam 130, and the middle beam 140 stores one battery cell unit 200.

[0068] For each accommodation space, a concave surface 114 is formed in the bottom plate 110, and a through hole 112 is formed in the concave surface 114. The concave surface 114 is shaped so that the body 410 of the battery cell lower plate 400 can be inserted, and the position and number of the through holes 112 correspond to the stud bolts 420 provided in the battery cell lower plate 400. The battery cell lower plate 400 inserted into the concave surface 114 and fastened to the bottom surface of the bottom plate 110 with the stud bolts 420 fastened with nuts 430 forms a part of the bottom plate 110.

[0069] In order to install the battery pack housing 100 above the battery cell lower plate 400, the battery cell unit fixing agent 300 is applied. As described above, the battery cell unit fixing agent 300 includes two types: a structural adhesive 310 and a non-curing filler 320, and the respective coating areas are based on the battery cell lower plate 400. That is, the structural adhesive 310 is applied on the battery cell lower plate 400, and the non-curing filler 320 is applied in other areas. It is worth noting that the structural adhesive 310 is not applied on the outside of the battery cell lower plate 400 to facilitate easy removal of the battery cell unit 200.

[0070] Next, if Figure 8 As shown, the battery cell units 200 are installed one by one in each accommodation space where the battery cell fixing agent 300 is applied in each region. The bottom surface of the battery cell unit 200 is fixed to the bottom plate 110 by the adhesiveness of the battery cell fixing agent 300.

[0071] Meanwhile, the battery cell unit 200 includes a plurality of battery cells 210 and a bus bar frame assembly 220 mechanically and electrically coupled to the plurality of battery cells 210 at both lateral ends where leads (not shown) of the battery cells 210 protrude. The battery cell unit 200 further includes side frames 230 protecting the battery cells 210 at both longitudinal sides.

[0072] In order to fix the battery cell unit 200 in the lateral direction, the side frame 230 of the battery cell unit 200 is fixed to the upper surface of the cross beam 130 with bolts. Figure 8 As shown, the side frame 230 of each battery cell unit 200 is fixed to the cross beam 130 assigned thereto, and the side frames 230 of the battery cell units 200 adjacent in the longitudinal direction do not overlap each other on the cross beam 130. This means that when a plurality of battery cell units 200 are installed in the battery pack housing 100, the battery cell units 200 do not need to be installed in a set assembly order, and when removing one battery cell unit 200, it is not necessary to remove the adjacent battery cell unit 200 first.

[0073] As such, the battery pack 10 of the present disclosure is able to separate only the faulty battery cell 200 because the other battery cell 200 does not interfere with the separation of any battery cell 200. Figure 3 As described, the area of ​​the curable adhesive layer 312 of the structural adhesive 310 that hinders the separation of the battery cell units 200 is limited to the battery cell lower plate 400, and the fastening of the battery cell lower plate 400 to the bottom plate 110 can be released, so it does not affect the separation of the battery cell units 200. Therefore, the battery pack 10 of the present disclosure makes it easy to remove any battery cell unit 200 regardless of the assembly order, thereby facilitating the replacement of a faulty battery cell 210.

[0074] The present disclosure has been described in more detail above with reference to the accompanying drawings and embodiments. However, it should be understood that the configuration shown in the accompanying drawings or embodiments described herein is only an embodiment of the present disclosure and does not represent the entire technical concept of the present disclosure, and that various equivalents and modifications that can replace these configurations may exist on the application date of the present disclosure.

[0075] [Explanation of Reference Numerals]

[0076] 10: Battery Pack

[0077] 100: Battery pack housing

[0078] 110: Base plate

[0079] 112: Through hole

[0080] 114: Concave

[0081] 116: Groove

[0082] 120: Side panels

[0083] 130: Beam

[0084] 140: Middle beam

[0085] 150: Cooling plate

[0086] 152: Flow path

[0087] 200: Battery monomer unit

[0088] 210: Battery Cell

[0089] 220: Busbar frame assembly

[0090] 230: Side frame

[0091] 240: Bolt

[0092] 300: Battery monomer unit fixing agent

[0093] 310: Structural Adhesives

[0094] 312: Curable adhesive layer

[0095] 320: Non-curing filler

[0096] 322: Non-curing adhesive layer

[0097] 400: Battery cell lower plate

[0098] 410: Main body

[0099] 420: Stud bolt

[0100] 430: Nut

Claims

1. A battery pack comprising: A battery monomer unit, wherein the battery monomer unit includes a plurality of battery monomers; A bottom plate, the bottom plate supporting the bottom surface of the battery monomer unit; A battery monomer unit fixing agent, the battery monomer unit fixing agent is inserted between the battery monomer unit and the bottom plate, the battery monomer unit fixing agent comprises a structural adhesive and a non-curing filler, the structural adhesive is applied to a portion of the bottom surface of the battery monomer unit or contacts the portion, and the non-curing filler is applied to the remaining portion of the bottom surface of the battery monomer unit or contacts the remaining portion; as well as A battery cell lower plate is interposed between the bottom plate and the battery cell unit fixing agent, is removably fastened to the bottom plate, and is adhered and fixed to the battery cell unit by the structural adhesive.

2. The battery pack according to claim 1, wherein: The structural adhesive does not occupy any area outside of the battery cell lower plate.

3. The battery pack according to claim 1, wherein: The battery cell lower plate includes a main body in which the structural adhesive is inserted and stud bolts extending from the main body. Wherein, the stud bolt is fixed with a nut through a through hole formed in the base plate.

4. The battery pack according to claim 3, wherein: The upper surface of the bottom plate is provided with a concave surface including the through hole, Wherein, the main body of the battery cell lower plate is accommodated in the concave surface.

5. The battery pack according to claim 4, wherein: An upper surface of the main body received in the concave surface is consistent with an upper surface of the bottom plate.

6. The battery pack according to claim 3, wherein: The bottom surface of the bottom plate is provided with a groove, and the groove is used to accommodate the nut so that the nut does not protrude outward and a tool can enter.

7. The battery pack according to claim 3, wherein: The bottom surface of the base plate is combined with a cooling plate, The stud bolts and the nuts are located in an area of ​​the cooling plate where no flow path is formed.

8. The battery pack according to claim 3, wherein: The structural adhesive forms a curable adhesive layer, Wherein, the non-curing filler forms a non-curing adhesive layer.

9. The battery pack according to claim 8, wherein: As the fastening of the stud bolts and nuts is released, the battery cell unit is released from the fixed state relative to the bottom plate and is taken out of the battery pack together with the battery cell lower plate bonded to each other by the structural adhesive.

10. The battery pack according to claim 1, wherein: The non-curable filler is disposed on both sides of the structural adhesive in the battery monomer unit fixing agent.

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