Battery cell assembly and battery pack comprising same

Abstract

The present disclosure relates to a battery cell assembly and a battery pack housing the same, the battery cell assembly including: a battery cell stack including a plurality of battery cells, electrode leads being led out from both sides of the plurality of battery cells; a bus bar frame coupled to the front surface and the rear surface of the battery cell stack, respectively, and including bus bars electrically connected to the respective electrode leads; and a pair of side members combined with the bus bar frame to support both sides of the battery cell stack, in which a lower end portion of at least one of the pair of side members is coated with a thermal insulation material.

Description

Technical Field

[0001] The present disclosure relates to a battery cell assembly and a battery pack including the battery cell assembly. More specifically, the present disclosure provides a battery cell assembly including a side beam having a lower end portion coated with a heat insulating material, and provides a battery pack using the side beam of the battery cell assembly to prevent heat movement in an internal space.

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2022-0167127 filed on December 2, 2022, Korean Patent Application No. 10-2023-0035457 filed on March 17, 2023, and Korean Patent Application No. 10-2023-0172124 filed on December 1, 2023, the disclosures of which are incorporated herein by reference in their entirety. Background Art

[0003] Types of secondary batteries include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of these unit secondary battery cells (i.e., unit battery cells) is generally 2.5V to 4.2V. Therefore, if a higher output voltage is required, multiple battery cells are connected in series to form a battery pack. In addition, depending on the charge and discharge capacity required for the battery pack, multiple battery cells can be connected in parallel to form a battery pack. Therefore, the number of battery cells included in the battery pack can vary according to the required output voltage or charge and discharge capacity.

[0004] For example, when a battery pack is configured by connecting a plurality of battery cells in series / parallel, a battery module made of the plurality of battery cells is first configured.

[0005] Figure 1 An example of a battery module of the prior art is shown, and Figure 1 is a perspective view of a battery cell assembly 10 having a soft-pack type battery cell 30 exposed to the outside. Specifically, Figure 1 The battery cell assembly 10 shown in FIG. 1 is combined with a bus bar frame 50 having electrode leads led out from both sides and covering the electrode leads of the front and rear portions of a plurality of battery cells 30 stacked in one direction.

[0006] like Figure 1 The illustrated form has an advantage of being lighter in weight than a related art battery module that surrounds and seals the battery cells 30 with a structure that omits a module frame that surrounds and protects the internal battery cells 30 .

[0007] Figure 2are perspective and front views of a related art battery cell assembly 10 having side beams 40 coupled to both sides to support the sides of a battery cell block 20, and Figure 3 Shows Figure 2 The shape of the side beam 40 combined with both sides.

[0008] Figure 2 The battery cell assembly 10 of (a) is characterized in that a side beam 40 is used to improve the side support of the battery cell assembly 10. Figure 2 As shown in (b), the upper and lower portions of the pair of side beams 40 are respectively formed with protrusions 41, wherein the protrusions 41 are formed with steps to have an interlocking shape.

[0009] When the battery cell assemblies 10 having the side beams as described above are accommodated in a battery pack, the side beams provided on the sides of the respective battery cell assemblies 10 are engaged and combined with each other.

[0010] Figure 3 A pair of battery cell assemblies 10 are shown housed in the inner space of a battery pack case 60 included in the battery pack. Figure 3 The illustrated pair of battery cell assemblies 10 disposed adjacent to each other are engaged and coupled to each other by side beams 40 provided at side portions of the respective battery cell assemblies 10 .

[0011] Figure 4 Shows the accommodation Figure 2 The battery pack housing 60 of the battery cell assembly 10 includes a bottom plate 70, a side wall 80, a main wall 90, etc., which respectively support the lower part and the side part of the battery cell assembly 10. Figure 2 The battery pack housing 60 of the battery cell assembly 10 shown has the advantage that the side wall 80 and the main wall 90 are combined with each other to separate the individual battery cell assemblies 10, and no separate partition wall or the like is required to divide the internal space. This is because the side beams provided on the sides of the battery cell assembly 10 can assume the function of the partition wall of the prior art.

[0012] Figure 5 It is a bottom perspective view of a portion of the side member 40 interposed between a pair of battery cell assemblies 10 coupled to each other.

[0013] Figure 2 The illustrated battery cell assemblies 10 may be physically separated from one another within the battery pack housing 60 by the presence of the side rails 40 .

[0014] However, if Figure 5As shown, since the lower end of the side beam 40 is formed flat, a small gap may exist between the lower end of the side beam 40 and the flat bottom plate 70. Such a gap can be used as a passage to easily transfer gas, flame, heat, etc. to other normal battery cell assemblies 10 in the event of thermal runaway of any battery cell assembly 10.

[0015] Figure 6 is a partial cross-sectional view of a battery pack case 60 of the prior art, in which it can be seen that gas, flame, heat, etc. move between a pair of side beams and a bottom plate that are coupled to each other.

[0016] As mentioned above, Figure 2 The illustrated battery cell assembly 10 has a problem in that, when housed in the pack case 60 , high temperature gas, flame, heat, etc. can easily propagate through a small gap.

[0017] In the prior art, various solutions have been studied to solve the problem of applying Figure 2 The problem of gas, flame and heat propagation in a battery pack of the novel battery cell assembly 10 is shown. Summary of the invention

[0018] Technical issues

[0019] Therefore, an object of the present disclosure is to provide a battery pack capable of suppressing heat propagation between internal spaces.

[0020] Other purposes and advantages of the present disclosure will be understood from the following description, and other purposes and advantages of the present disclosure will become more obvious according to the embodiments of the present disclosure. It is also obvious that the purposes and advantages of the present disclosure can be achieved by the methods and combinations disclosed in the patent claims.

[0021] Technical Solution

[0022] According to the present disclosure, a battery cell assembly is provided, comprising: a battery cell block, the battery cell block comprising a plurality of battery cells, electrode leads leading out from the plurality of battery cells; a bus bar frame, the bus bar frame being combined with the battery cell block and comprising bus bars electrically connected to the electrode leads of the battery cell block; and a pair of side beams, the pair of side beams being combined with the bus bar frame to support both sides of the battery cell block, wherein a lower end portion of at least one of the pair of side beams is coated with a heat insulating material.

[0023] The side beam includes: a first side beam, which is combined with one end of the bus bar frame to support one side of the battery cell block; and a second side beam, which is combined with the other end of the bus bar frame to support the other side of the battery cell block; wherein the first side beam and the second side beam are configured to engage with each other.

[0024] The side beam may include a protrusion protruding in a step-forming manner in a height direction of the battery cell block.

[0025] The protrusion may include an upper protrusion formed at an upper portion of the first side beam, and a lower protrusion formed at a lower portion of the second side beam.

[0026] The first side beam and the second side beam may be configured such that the upper protrusion and the lower protrusion engage with each other.

[0027] The lower end portion of the second side beam includes an insertion groove formed for inserting a heat insulating material, wherein the heat insulating material may be applied to fill in the insertion groove.

[0028] The insertion groove may extend along a length direction of the second side beam.

[0029] According to the present disclosure, a battery pack is provided, comprising: the above-mentioned battery cell assembly; and a battery pack shell, which provides a space for the battery cell assembly to be placed therein, wherein any pair of battery cell assemblies arranged adjacent to each other are placed in the battery pack shell in a manner in which a first side beam of one battery cell assembly is combined with a second side beam of another battery cell assembly.

[0030] The first side beam and the second side beam may be combined together to form a partition wall that partitions a pair of adjacent battery cell blocks.

[0031] The lower end portion of the partition wall may be coated with a heat insulating material.

[0032] The lower end portion of the partition wall includes an insertion groove formed for inserting the heat insulating material, wherein the heat insulating material may be applied to fill in the insertion groove.

[0033] The battery pack case includes a bottom plate supporting a lower portion of the battery cell assembly, wherein a heat insulating material may be sealed between the partition wall and the bottom plate.

[0034] The dividing wall may be screwed to the base plate.

[0035] The battery pack case includes a coupling member in a threaded form for coupling the partition wall and the bottom plate to each other, wherein the coupling member may be threadedly coupled to the bottom plate by vertically penetrating the partition wall and a heat insulating material coated on a lower end portion of the partition wall.

[0036] Beneficial Effects

[0037] According to the battery pack containing battery cell assemblies of the present disclosure, even if any one of the battery cell assemblies contained therein undergoes thermal runaway and generates high-temperature gas and flame, propagation of the gas and flame to other battery cell assemblies can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 An example of a prior art battery module is shown.

[0039] Figure 2 A prior art battery cell assembly to which side beams are applied is shown.

[0040] Figure 3 Shows Figure 2 The combination of battery cell assemblies is shown.

[0041] Figure 4 Shows the capacity Figure 2 A battery pack housing of a battery pack of a battery cell assembly.

[0042] Figure 5 yes Figure 4 A bottom perspective view of a pair of battery cell assemblies coupled together and a portion of a side beam interposed between the battery cell assemblies within a battery pack housing.

[0043] Figure 6 is to accommodate Figure 2 A cross-sectional view of a portion of a battery pack housing of a battery cell assembly.

[0044] Figure 7 are perspective views and front views of a battery cell assembly of the present disclosure.

[0045] Figure 8 is a bottom perspective view of a portion of a second side beam included in a battery cell assembly.

[0046] Fig. 9 is a perspective view of a battery pack according to a first embodiment of the present disclosure.

[0047] Fig.10 is a simplified illustration of the arrangement of simplified side beams of a pair of battery cell assemblies disposed adjacent to each other within a battery pack housing.

[0048] Fig.11 The bonding of a pair of adjacent battery cell assemblies is shown.

[0049] Fig.12 It is a bottom perspective view of a portion of a partition wall included in a pair of battery cell assemblies coupled to each other.

[0050] Fig.13 The partition wall is located at Fig. 9 A cross-sectional view of a limited area within a battery pack housing.

[0051] Fig.14 yes Fig. 9 A cross-sectional view of a portion of a battery pack casing is shown with simplified illustrations of the movement of gases, flames, and heat.

[0052] Fig.15 is a bottom perspective view of a portion of a second side beam included in a battery pack according to a second embodiment of the present disclosure.

[0053] Fig.16 It is a bottom perspective view of a portion of a partition wall included in a pair of battery cell assemblies coupled to each other.

[0054] Fig.17 It is a cross-sectional view of a portion of a battery pack case where a partition wall is located.

[0055] Fig.18 is a cross-sectional view of a portion of a battery housing and is simplified to illustrate the movement of gases, flames, and heat.

[0056] Fig.19 is a schematic diagram illustrating another exemplary embodiment of a battery cell assembly of the present disclosure.

[0057] Fig. 20 is a schematic diagram showing yet another exemplary embodiment of a battery cell assembly of the present disclosure.

[0058] Fig.21 is a schematic diagram showing yet another exemplary embodiment of a battery cell assembly of the present disclosure. DETAILED DESCRIPTION

[0059] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Prior to this, the terms and words used in this specification and claims should not be interpreted as limited or only in the dictionary, but should be interpreted according to the meaning and concept consistent with the technical spirit of the present disclosure based on the principle that the inventor has the right to define the terms in a way that best describes his invention.

[0060] Therefore, it should be understood that the embodiments described in this specification and the configurations shown in the accompanying drawings are merely the most preferred embodiments of the present disclosure and do not represent the entire technical spirit of the present disclosure, so it should be understood that various equivalents and modifications that can replace these embodiments may exist when submitting this application.

[0061] Furthermore, in describing the present disclosure, in the case where a detailed description of the configuration or features of the related disclosure is considered to obscure the essence of the present disclosure, such a detailed description is omitted.

[0062] Since the embodiments of the present disclosure are provided to more fully illustrate the present disclosure to those skilled in the art, the shapes and sizes of the components in the figures may be magnified, omitted or schematically illustrated for clarity. Therefore, the sizes or ratios of the various components do not necessarily represent their actual sizes or ratios.

[0063] The present disclosure relates to a battery cell assembly and a battery pack including the battery cell assembly. More specifically, the present disclosure provides a battery cell assembly including a side beam having a lower end portion coated with a heat insulating material, and provides a battery pack using the side beam of the battery cell assembly to prevent heat movement in an internal space.

[0064] Figures 7 and 8 The battery cell assembly of the present disclosure, Figures 9 to 14 Relating to a battery pack according to a first embodiment of the present disclosure, Figures 15 to 18 relates to a battery pack according to a second embodiment of the present disclosure, and Figures 19 to 21 Another exemplary embodiment of a battery cell assembly of the present disclosure is directed to.

[0065] Hereinafter, a battery cell assembly and a battery pack of the present disclosure will be described with reference to the accompanying drawings.

[0066] Battery cell assembly 1000

[0067] The battery cell assembly 1000 of the present disclosure includes a battery cell block 1100 , a bus bar frame 1200 coupled to the battery cell block 1100 , and a pair of side beams 1300 respectively coupled to both sides of the battery cell block 1100 .

[0068] The battery cell block 1100 includes a plurality of battery cells 1110 .

[0069] The battery cell 1110 includes an electrode assembly (not shown) formed by alternately stacking electrodes and separators, and a case (not shown) surrounding and sealing the electrode assembly.

[0070] The battery cells 1110 are classified into pouch-type battery cells, square-shaped battery cells, and cylindrical-shaped battery cells according to electrode assemblies and cases.

[0071] The battery cell assembly 1000 may further include a module frame surrounding the periphery of the battery cell block 1100, thereby protecting each battery cell 1110 from external impact. In this case, the module frame may be provided to support or protect only a portion of the battery cell block 1100, or may be provided on all exposed portions of the battery cell block 1100 to completely isolate the battery cell block 1100 from the outside.

[0072] Figure 7 1 is a perspective view and a front view of a battery cell assembly 1000 of the present disclosure. More specifically, Figure 7 1 shows a battery cell assembly 1000 in which a soft-pack type battery cell 1110 is accommodated. (Hereinafter, for ease of understanding, Figures 7 to 18 The focus will be on the battery cell assembly 1000 including the pouch type battery cell 1110 and the battery pack case 2000 ).

[0073] like Figure 7 As shown, the battery cell block 1100 includes a plurality of battery cells 1110 having electrode leads (not shown). More specifically, the battery cell block 1100 includes a plurality of battery cells 1110 stacked in one direction.

[0074] The bus bar frame 1200 includes bus bars (not shown) electrically connected to respective electrode leads of the battery cell block 1100 , and is combined with the battery cell block 1100 .

[0075] like Figure 7 As shown in (b), the side beam 1300 includes a first side beam 1300 a coupled to one side of the battery cell block 1100 and a second side beam 1300 b coupled to the other side of the battery cell block 1100 .

[0076] More specifically, the first side beam 1300 a is coupled to one end of the bus bar frame 1200 to support one side of the battery cell block 1100 , and the second side beam 1300 b is coupled to the other end of the bus bar frame 1200 to support the other side of the battery cell block 1100 .

[0077] The side beam 1300 includes a protrusion protruding in a stepped manner along a height direction of the battery cell block 1100. Specifically, the other surface of each of the pair of side beams 1300 opposite to one surface contacting the battery cell block 1100 includes a protrusion.

[0078] In one of the pair of side beams 1300, a protrusion is formed at an upper portion, and in the other, a protrusion is formed at a lower portion. That is, the first side beam 1300a and the second side beam 1300b are formed to be engaged with each other by protrusions formed at different positions.

[0079] The protrusions include an upper protrusion 1300a1 formed at an upper portion of the first side beam 1300a and a lower protrusion 1300b1 formed at a lower portion of the second side beam 1300b.

[0080] The first side beam 1300 a and the second side beam 1300 b have a shape in which an upper protrusion 1300 a 1 and a lower protrusion 1300 b 1 are engaged with each other.

[0081] The battery cell assembly 1000 of the present disclosure is characterized in that it includes a heat insulating material 3000 at a lower end portion of any one of the pair of side beams 1300 .

[0082] Preferably, the second side beam 1300 b including the lower end protrusion includes a heat insulating material 3000 .

[0083] Figure 8is a bottom perspective view of a portion of a second side beam 1300 b included in the battery cell assembly 1000 .

[0084] like Figure 8 As shown, the heat insulating material 3000 is coated on the lower end portion of the second side beam 1300b.

[0085] The heat insulating material 3000 is formed to extend from the lower end portion of the second side beam 1300b along the length direction of the second side beam 1300b.

[0086] The heat insulating material 3000 may include at least one of an organic material and an inorganic material. For example, the heat insulating material 3000 may be cork, cotton, felt, carbide, rubber, asbestos, glass wool, quartz wool, diatomaceous earth, magnesium carbonate powder, etc. However, the type of the heat insulating material 3000 is not limited to those materials listed above, and any material having low thermal conductivity or that can effectively delay heat transfer may be used.

[0087] The heat insulating material 3000 may be attached to the lower end portion of the second side beam 1300 b in a solid form, or may be applied and coated in a slurry form.

[0088] The battery cell assembly 1000 of the present disclosure may further include a second side beam 1300 b having a lower end portion including an insertion groove 1300 b 2 into which the heat insulating material 3000 may be inserted, in order to more stably attach the heat insulating material 3000 .

[0089] Hereinafter, the insertion groove 1300b2 will be described in more detail with reference to the accompanying drawings in conjunction with the second embodiment.

[0090] Battery Pack

[0091] The battery pack of the present disclosure is characterized in that it includes a battery cell assembly 1000 provided with a second side beam 1300 b on one side, and a portion of a lower end portion of the second side beam 1300 b includes a heat insulating material 3000 .

[0092] (First embodiment)

[0093] Fig. 9 is a perspective view of a battery pack according to a first embodiment of the present disclosure.

[0094] like Fig. 9 As shown, the battery pack includes a battery pack case 2000 providing a space for accommodating a plurality of battery cell assemblies 1000 .

[0095] The pack case 2000 includes a bottom plate 2100 supporting the lower portion of the battery cell assembly 1000 , a side wall 2200 coupled along an edge of the bottom plate 2100 to support the side of each battery cell assembly 1000 , and a main wall 2300 crossing the middle of the pack case 2000 and coupled to the bottom plate 2100 .

[0096] The main wall 2300 is formed to extend along the length direction of the pack case 2000 , and is combined with the bottom plate 2100 to divide the inner space of the pack case 2000 into two large partitioned spaces.

[0097] A plurality of battery cell assemblies 1000 are provided at both sides of the main wall 2300, and are seated on the bottom plate 2100. Each of the battery cell assemblies 1000 is provided such that the side beams 1300 provided on the sides are engaged and combined with each other.

[0098] Fig.10 1 is a simplified diagram of the arrangement of the side beams 1300 of a pair of battery cell assemblies 1000 disposed adjacent to each other inside the battery pack case 2000 .

[0099] like Fig.10 As shown, a pair of adjacent battery cell assemblies 1000 are formed so that the first side beam 1300a of one battery cell assembly 1000 and the second side beam 1300b of the other battery cell assembly 1000 are engaged with each other. Specifically, the upper protrusion 1300a1 of the first side beam 1300a provided on one side of the one battery cell assembly 1000 is assembled to the upper part of the lower protrusion 1300b1 of the second side beam 1300b provided on one side of the other battery cell assembly 1000. Therefore, the first side beam 1300a and the second side beam 1300b facing each other can be engaged and combined with each other in the form of the upper protrusion 1300a1 and the lower protrusion 1300b1.

[0100] Fig.11 The bonding of a pair of adjacent battery cell assemblies 1000 is shown.

[0101] like Fig.11 As shown, the first side beam 1300 a and the second side beam 1300 b provided in each battery cell assembly 100 are combined together to form a single partition wall 2400 .

[0102] The partition wall 2400 formed by combining a pair of side beams 1300 may serve to partition an adjacent pair of battery cell blocks 1100 from each other in the inner space of the battery pack case 2000 , and may also serve to support the sides of the respective battery cell blocks 1100 .

[0103] The partition wall 2400 serves to block gas, flame, and heat generated in each battery cell assembly 1000 from being transferred to other battery cell assemblies 1000 .

[0104] The lower end portion of one partition wall 2400 formed by combining the side beam 1300 contains the heat insulating material 3000 .

[0105] Fig.12 2 is a bottom perspective view of a portion of a partition wall 2400 included in a pair of battery cell assemblies 1000 coupled to each other.

[0106] The partition wall 2400 is formed by combining a first side beam 1300 a and a second side beam 1300 b including a heat insulating material 3000 at the lower end thereof.

[0107] In particular, the lower end of the lower protrusion 1300b1 of the second side beam 1300b includes the heat insulating material 3000. Since the lower portion of the partition wall 2400 is mostly occupied by the lower protrusion 1300b1 of the second side beam 1300b, the lower end of the partition wall 2400 is mostly occupied by the heat insulating material 3000 included in the lower end of the second side beam 1300b.

[0108] Fig.13 yes Fig. 9 2 is a cross-sectional view of a limited area of ​​a battery pack case 2000 where a partition wall 2400 is located.

[0109] Reference Fig.13 The partition wall 2400 formed by combining the first side beam 1300a and the second side beam 1300b is interposed between a pair of adjacent battery cell blocks 1100. In addition, the heat insulating material 3000 is interposed between the partition wall 2400 and the bottom plate 2100 supporting the lower portion of the battery cell assembly 1000.

[0110] As described above, the heat insulating material 300 effectively insulates the inner space of the pack case 2000 in which the respective battery cell assemblies 1000 are located by sealing all gaps that may be formed between the partition wall 2400 and the bottom plate 2100 .

[0111] The battery pack disclosed herein is characterized in that when any battery cell assembly 1000 contained therein undergoes thermal runaway and discharges high-temperature gas, flame and heat, the gas, flame and heat are blocked by the partition wall 2400 and the insulating material 3000 arranged at the lower end of the partition wall 2400 to protect other normal battery cell assemblies 1000.

[0112] Fig.14 yes Fig. 9 A cross-sectional view of a portion of battery pack housing 2000 is shown with simplified illustrations of the movement of gases, flames, and heat.

[0113] Reference Fig.14 , gas, flame, and heat from the battery cell assembly 1000 in which thermal runaway has occurred are blocked by the heat insulating material 3000 interposed between the partition wall 24000 and the bottom plate 2100 , and cannot move to other spaces.

[0114] The battery cell assembly 1000 of the present disclosure may be fixed by being screw-coupled to the inner space of the pack case 2000 using a coupling member such as a bolt, etc. Specifically, the partition wall 2400 is screw-coupled to the bottom plate 2100 .

[0115] The battery pack case 2000 may further include a bolt-type coupling member (not shown) for coupling the partition wall 2400 and the bottom plate 2100 to each other, and the coupling member may be threadedly coupled to the bottom plate 2100 by vertically penetrating the partition wall 2400 and the heat insulating material 3000 coated on the lower end portion of the partition wall 2400. In this case, the coupling member is threadedly coupled to the bottom plate 2100 by vertically penetrating the partition wall 24000 and the heat insulating material 3000 coated on the lower end portion of the partition wall 2400, so that the heat insulating material 3000 may also be stably fixed to the partition wall 2400 and the bottom plate 2100 by the coupling member.

[0116] The coupling member is screwed to the bottom plate 2100 by simultaneously penetrating the upper protrusion 1300a1 of the first side beam 1300a and the lower protrusion 1300b1 of the second side beam 1300b, so that the first side beam 1300a and the second side beam 1300b can also be coupled and fixed to each other by the coupling member.

[0117] (Second embodiment)

[0118] The battery pack of the present disclosure may further form a groove at the lower end portion of the partition wall 2400 to more securely attach the heat insulating material 3000 for blocking gas, flame, heat, etc.

[0119] Fig.15 is a bottom perspective view of a portion of a second side beam 1300 b included in the battery pack according to the second embodiment of the present disclosure.

[0120] like Fig.15 As shown, the lower end portion of the second side beam 1300 b includes an insertion groove 1300 b 2 formed to insert the heat insulating material 3000 .

[0121] The insertion groove 1300b2 may be formed to extend along a length direction of the second side beam 1300b.

[0122] The heat insulating material 3000 may be inserted into and attached to the insertion groove 1300 b 2 , or may be coated with the heat insulating material 3000 .

[0123] The heat insulating material 3000 is filled in the entire insertion groove 1300b2 formed to extend along the length direction of the second side beam 1300b.

[0124] Fig.16 2 is a bottom perspective view of a portion of a partition wall 2400 included in a pair of battery cell assemblies 1000 coupled to each other.

[0125] Reference Fig.16 , the insertion groove 1300 b 2 formed at the lower end portion of the partition wall 2400 is filled with the heat insulating material 3000 .

[0126] Fig.17 2 is a cross-sectional view of a portion of the battery pack case 2000 where the partition wall 2400 is located.

[0127] Reference Fig.16 and Fig.17 , the heat insulating material 3000 may be minimally exposed to the outside while being inserted into the insertion groove 1300b2, and side support may be enhanced by the insertion groove 1300b2.

[0128] Specifically, the insulation material 3000 filled in the insertion groove 1300b2 extending along the length direction of the partition wall 2400 is not pushed or pulled out in the horizontal direction by the side supporting force of the insertion groove 1300b2, and can be stably inserted and located between the partition wall 2400 and the bottom plate 2100.

[0129] The heat insulating material 3000 filled in the insertion groove 1300 b 2 may effectively block gas, flame, and heat attempting to migrate through the gap between the partition wall 2400 and the bottom plate 2100 .

[0130] Fig.18 is a cross-sectional view of a portion of the battery pack housing 2000 and simplifies the movement of gas, flame, and heat.

[0131] Reference Fig.18 , gas, flame, and heat from the battery cell assembly 1000 in which thermal runaway has occurred are blocked between the partition wall 2400 and the bottom plate 2100 by the heat insulating material 3000 inserted in the insertion groove 1300b2 and prevented from migrating to other spaces.

[0132] Figures 19 to 21 Different forms of the battery cell assembly of the present disclosure are shown respectively. Specifically, Fig.19 and Fig. 20 is a perspective view of a battery cell assembly 1000 including a square battery cell 1110, and Fig.21 is a perspective view of a battery cell assembly 1000 including a cylindrical battery cell 1110 .

[0133] Reference Fig.19 , the battery cell block 1100 includes a square battery cell 1110 having an electrode lead formed on an upper portion.

[0134] The battery cell block 1100 may further include a connection member 1400 that electrically connects electrode leads of adjacent battery cells 1110 .

[0135] The bus bar frame 1200 includes bus bars (not shown) electrically connected to respective electrode leads or connection members 1400 of the battery cell block 1100 , and is combined with the battery cell block 1100 .

[0136] like Fig.19 As shown, the side beam 1300 includes a first side beam 1300a coupled to one side of the battery cell block 1100 and a second side beam 1300b coupled to the other side of the battery cell block 1100. The side beam 1300 includes a protrusion that protrudes in a step-forming manner along the height direction of the battery cell block 1100. Specifically, the other surface of each of the pair of side beams 1300, which is opposite to the one surface contacting the battery cell block 1100, includes a protrusion.

[0137] The protrusions include an upper protrusion 1300a1 formed at an upper portion of the first side beam 1300a and a lower protrusion 1300b1 formed at a lower portion of the second side beam 1300b.

[0138] The battery cell assembly 1000 of the present disclosure is characterized in that it includes a heat insulating material 3000 at a lower end portion of any one of the pair of side beams 1300 .

[0139] Preferably, the second side beam 1300 b including the lower end protrusion includes a heat insulating material 3000 .

[0140] Reference Fig. 20 , the battery cell block 1100 includes a square battery cell 1110 having an electrode lead formed on an upper portion.

[0141] The battery cell block 1100 may further include a module frame 1500 including connection terminals (not shown) for electrical connection with electrode leads of the respective battery cells 1110 .

[0142] like Fig. 20 As shown, the module frame 1500 is coupled to an upper portion of the battery cell block 1100 , and through this coupling, connection terminals included in the module frame 1500 electrically connect electrode leads of the respective battery cells 1110 .

[0143] The bus bar frame 1200 includes bus bars (not shown) electrically connected to connection terminals of the module frame 1500 , and is combined with the battery cell block 1100 .

[0144] like Fig. 20 As shown, the side beam 1300 includes a first side beam 1300a coupled to one side of the battery cell block 1100 and a second side beam 1300b coupled to the other side of the battery cell block 1100. The side beam 1300 includes a protrusion that protrudes in a step-forming manner along the height direction of the battery cell block 1100. Specifically, the other surface of each of the pair of side beams 1300, which is opposite to the one surface contacting the battery cell block 1100, includes a protrusion.

[0145] The protrusions include an upper protrusion 1300a1 formed at an upper portion of the first side beam 1300a and a lower protrusion 1300b1 formed at a lower portion of the second side beam 1300b.

[0146] The battery cell assembly 1000 of the present disclosure is characterized in that it includes a heat insulating material 3000 at a lower end portion of any one of the pair of side beams 1300 .

[0147] Preferably, the second side beam 1300 b including the lower end protrusion includes a heat insulating material 3000 .

[0148] Reference Fig.21 , the battery cell block 1100 includes a cylindrical battery cell 1110 including an electrode lead at an upper portion.

[0149] The battery cell block 1100 may further include a pair of module frames 1500 including connection terminals (not shown) capable of electrically connecting electrode leads of the respective battery cells 1110 .

[0150] The module frames 1500 are respectively coupled at the upper and lower portions of the battery cell blocks 1100 , and through this coupling, connection terminals included in the module frames 1500 electrically connect electrode leads of the respective battery cells 1110 .

[0151] The bus bar frame 1200 includes bus bars (not shown) electrically connected to connection terminals of the module frame 1500 , and is combined with the battery cell block 1100 .

[0152] like Fig.21As shown, the side beam 1300 includes a first side beam 1300a coupled to one side of the battery cell block 1100 and a second side beam 1300b coupled to the other side of the battery cell block 1100. The side beam 1300 includes a protrusion that protrudes in a step-forming manner along the height direction of the battery cell block 1100. Specifically, the other surface of each of the pair of side beams 1300, which is opposite to the one surface contacting the battery cell block 1100, includes a protrusion.

[0153] The protrusions include an upper protrusion 1300a1 formed at an upper portion of the first side beam 1300a and a lower protrusion 1300b1 formed at a lower portion of the second side beam 1300b.

[0154] The battery cell assembly 1000 of the present disclosure is characterized in that it includes a heat insulating material 3000 at a lower end portion of any one of the pair of side beams 1300 .

[0155] Preferably, the second side beam 1300 b including the lower end protrusion includes a heat insulating material 3000 .

[0156] The present disclosure has been described in detail above with reference to the drawings and embodiments. However, it will be understood that the configuration shown in the drawings or embodiments described herein is only one embodiment of the present disclosure and does not represent all technical concepts of the present disclosure, and when the present disclosure is submitted, there may be various equivalents and modifications that can be substituted therefor.

[0157] [Explanation of Reference Numerals]

[0158] 10: (Prior Art) Battery Cell Assembly

[0159] 20: (Prior art) Battery cell block

[0160] 30: (Prior Art) Battery Cell

[0161] 40: (Prior Art) Side Beam

[0162] 41: (Prior Art) Protrusion

[0163] 50: (Prior Art) Busbar Frame

[0164] 60: (Prior Art) Battery Pack Housing

[0165] 70: (Prior Art) Bottom Plate

[0166] 80: (Prior Art) Side Wall

[0167] 90: (Prior Art) Main Wall

[0168] 1000: Battery cell assembly

[0169] 1100: Battery cell block

[0170] 1110: Battery Cell

[0171] 1200: Busbar frame

[0172] 1300: Side beam

[0173] 1300a: First side beam

[0174] 1300a1: Upper protrusion

[0175] 1300b: Second side beam

[0176] 1300b1: Lower protrusion

[0177] 130062: Insert into groove

[0178] 1400: Connecting components

[0179] 1500: Module Framework

[0180] 2000: Battery pack housing

[0181] 2100: Base plate

[0182] 2200: Sidewall

[0183] 2300: Main wall

[0184] 2400: Partition wall

[0185] 3000: Thermal insulation material

[0186] M: Gas, Flame and Heat Transfer

Claims

1. A battery cell assembly, comprising: A battery cell block, the battery cell block comprising a plurality of battery cells, electrode leads being led out from the plurality of battery cells; a bus bar frame combined with the battery cell block and including bus bars electrically connected to the electrode leads of the battery cell block; as well as a pair of side beams, the pair of side beams being combined with the bus bar frame to support both sides of the battery cell block, Wherein, a lower end portion of at least one of the pair of side beams is coated with a heat insulating material.

2. The battery cell assembly according to claim 1, wherein: The side beam comprises: a first side beam coupled to one end of the bus bar frame to support one side of the battery cell block; and a second side beam coupled to the other end of the bus bar frame to support the other side of the battery cell block, Wherein, the first side beam and the second side beam are configured to be joined to each other.

3. The battery cell assembly according to claim 2, wherein: The side beam includes a protrusion that protrudes in a stepped manner along a height direction of the battery cell block.

4. The battery cell assembly according to claim 3, wherein: The protrusion comprises: an upper protrusion formed at an upper portion of the first side member; and A lower protrusion is formed at a lower portion of the second side member.

5. The battery cell assembly according to claim 4, wherein: The first side beam and the second side beam are configured such that the upper protrusion and the lower protrusion are engaged with each other.

6. The battery cell assembly according to claim 2, wherein: The lower end portion of the second side beam includes an insertion groove formed to be used for inserting the heat insulating material. Wherein, the heat insulating material is applied to fill in the insertion groove.

7. The battery cell assembly according to claim 6, wherein: The insertion groove extends along a length direction of the second side beam.

8. A battery pack comprising: The battery cell assembly according to claim 1; as well as a battery pack housing, the battery pack housing providing a space in which the battery cell assembly is housed, Wherein, any pair of battery cell assemblies arranged adjacent to each other are placed in the battery pack housing in a manner in which a first side beam of one of the battery cell assemblies is combined with a second side beam of the other of the battery cell assemblies.

9. The battery pack according to claim 8, wherein: The first side beam and the second side beam are combined together to form a partition wall that partitions a pair of adjacent battery cell blocks.

10. The battery pack according to claim 9, wherein: The lower end portion of the partition wall is coated with a heat insulating material.

11. The battery pack according to claim 9, wherein: The lower end portion of the partition wall includes an insertion groove formed to be used for inserting the heat insulating material, Wherein, the heat insulating material is applied to fill in the insertion groove.

12. The battery pack according to claim 9, wherein: The battery pack housing includes a bottom plate that supports a lower portion of the battery cell assembly. Wherein, the heat insulating material is sealed between the partition wall and the bottom plate.

13. The battery pack according to claim 9, wherein: The partition wall is threadedly coupled to the bottom plate.

14. The battery pack according to claim 13, wherein: The battery pack housing includes a screw-shaped coupling member for coupling the partition wall and the bottom plate to each other. The coupling member is coupled to the bottom plate by vertically penetrating the partition wall and the heat insulating material coated on the lower end portion of the partition wall through threads.

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