Battery packs and automobiles containing them

Abstract

A battery pack according to one embodiment of the present invention is characterized by comprising a plurality of battery cells, a pack housing that accommodates the battery cells, and a filling portion that fills the space between the battery cells within the pack housing. The filling portion also comprises a resin layer and a foam layer. The battery pack according to one embodiment of the present invention has the effect of preventing thermal transfer and ensuring rigidity by including a filling portion comprising a resin layer and a foam layer in the empty space within the pack.

Description

Technical Field

[0001] The present invention relates to a battery pack, and more particularly to a battery pack capable of preventing heat transfer between cells in the pack and ensuring rigidity.

Background Art

[0002] A secondary battery refers to a battery that can be charged and discharged, unlike a primary battery that cannot be charged. It is applied not only to portable devices but also to electric vehicles (EVs), hybrid electric vehicles (HEVs), etc. driven by an electric drive source.

[0003] Currently, the types of secondary batteries widely used include lithium-ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel metal hydride batteries, nickel zinc batteries, etc. The operating voltage of such a unit secondary battery cell, that is, a unit battery cell, is about 2.5V to 4.6V. Therefore, when a higher output voltage is required, a plurality of battery cells are connected in series to form a battery pack. Also, depending on the charge / discharge capacity required for the battery pack, a plurality of battery cells may be connected in parallel to form a battery pack. Therefore, the number of battery cells included in the battery pack can be set variously according to the required output voltage or charge / discharge capacity.

[0004] When a plurality of battery cells are connected in series / parallel to form a battery pack, generally, at least one battery cell, preferably a battery pack composed of a plurality of battery cells, is first formed, and at least one such battery pack is used, and other components are added to form a battery pack. Here, a battery pack means a component in which a plurality of battery cells are connected in series or parallel, and a battery pack means a component in which a plurality of battery packs are connected in series or parallel to increase the capacity and output, etc.

[0005] A battery pack consists of a structure that houses multiple battery cells within a case. However, if there is empty space within the case, it can be detrimental to the rigidity of the pack or the pack as a whole, and may also be detrimental to thermal transfer. [Overview of the project] [Problems that the invention aims to solve]

[0006] The present invention aims to provide a battery pack and an automobile including it that can prevent thermal transfer and ensure rigidity. [Means for solving the problem]

[0007] A battery pack according to one embodiment of the present invention is characterized by comprising a plurality of battery cells, a pack housing that accommodates the battery cells, and a filling portion that fills the space between the battery cells within the pack housing.

[0008] Furthermore, the filling portion includes a resin layer and a foam layer.

[0009] Furthermore, the resin layer includes a first resin layer and a second resin layer, and the foam layer is positioned between the first resin layer and the second resin layer.

[0010] The battery pack further includes a lower plate, and the battery cells are arranged on the lower plate.

[0011] Furthermore, the pack housing includes a bottom frame, the lower plate is spaced above the bottom frame, and further includes a bending space between the bottom frame and the lower plate.

[0012] Furthermore, the resin layer contains silicone resin.

[0013] Furthermore, the foam layer includes urethane foam or polyurethane foam.

[0014] The pack housing further includes side walls, the battery cells being positioned between the side walls.

[0015] Furthermore, the thickness of the foam layer may be 2 to 4 times the thickness of the first resin layer.

[0016] Furthermore, the thickness of the second resin layer may be 0.5 to 1.5 times the thickness of the first resin layer.

[0017] Furthermore, the resin layer is positioned above the foam layer.

[0018] Furthermore, the thickness of the resin layer may be 0.3 to 0.8 times the thickness of the foam layer.

[0019] Furthermore, the battery cell may be a cylindrical cell.

[0020] Furthermore, the battery cells are arranged in multiple rows, and cooling tubes through which the refrigerant flows are positioned between two adjacent rows of the battery cells.

[0021] Furthermore, the battery cells are arranged in multiple rows, and a support member for supporting the battery cells is positioned between two adjacent rows of battery cells. [Effects of the Invention]

[0022] Therefore, the battery pack and automobile according to the present invention have the effect of preventing thermal transfer and ensuring rigidity by filling the empty space within the battery pack with resin and foam. [Brief explanation of the drawing]

[0023] [Figure 1] This is a perspective view of a battery pack according to one embodiment of the present invention. [Figure 2] Figure 1 is an exploded perspective view of the battery pack. [Figure 3] It is a partial detailed view of the top frame in FIG. 1. [Figure 4] It is a view showing a cylindrical battery cell according to an embodiment of the present invention. [Figure 5] It is a longitudinal sectional view of the battery cell in FIG. 4. [Figure 6] It is a plan view of a battery pack according to another embodiment of the present invention. [Figure 7] It is a partial plan view showing a state in which a battery cell is housed in a battery pack according to another embodiment of the present invention. [Figure 8] It is a longitudinal sectional view of a battery pack according to another embodiment of the present invention. [Figure 9] It is a partial detailed view of FIG. 8. [Figure 10] It is a longitudinal sectional view of a battery pack according to another embodiment of the present invention. [Figure 11] It is a partial detailed view of FIG. 10. [Figure 12] It is a view showing an electric vehicle equipped with a battery pack according to an embodiment of the present invention.

Mode for Carrying Out the Invention

[0024] The advantages, features, and methods for achieving them of the present invention will become apparent by referring to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and can be embodied in various different forms. However, this embodiment is provided so that the disclosure of the present invention is complete and that those having ordinary knowledge in the technical field to which the present invention pertains are fully informed of the scope of the invention. The present invention is only defined by the claims. Therefore, in some embodiments, well-known process steps, well-known element structures, and well-known technologies are not specifically described in order to avoid the present invention being ambiguously interpreted. Throughout the specification, the same reference numerals refer to the same components.

[0025] In drawings, thickness may be enlarged to clearly represent multiple layers and regions. The same reference numerals are used throughout the specification for similar parts. When a layer, film, region, plate, etc. is described as being "above" another part, this includes not only when it is "immediately above" another part, but also when there is another part in between. Conversely, when a part is described as being "immediately above" another part, it means there is no other part in between. Similarly, when a layer, film, region, plate, etc. is described as being "below" another part, this includes not only when it is "immediately below" another part, but also when there is another part in between. Conversely, when a part is described as being "immediately below" another part, it means there is no other part in between.

[0026] The structure of the battery pack 1000 according to the present invention will be described in detail with reference to the drawings.

[0027] Figure 1 is a perspective view of a battery pack according to one embodiment of the present invention, Figure 2 is an exploded perspective view of the battery pack in Figure 1, Figure 3 is a detailed view of a part of the top frame in Figure 1, Figure 4 is a diagram showing a cylindrical battery cell according to one embodiment of the present invention, and Figure 5 is a longitudinal cross-sectional view of the battery cell in Figure 4.

[0028] The battery pack 1000 may include a plurality of battery cells 100, a pack housing 200, and a plurality of busbars 300, and may further include a sensing plate 400 connected to the busbars 300 for sensing the voltage of each cell 100.

[0029] The battery cell 100 may be a cylindrical battery cell 100 in which the electrode assembly 110 is incorporated into a metal can.

[0030] As shown in Figures 4 and 5, the cylindrical battery cell 100 may include a jelly roll-shaped electrode assembly 110 and a battery case 120 for housing the electrode assembly 110. An upper insulating member 150 may be placed at the upper end of the electrode assembly 110, and a lower insulating member 160 may be placed at the lower end of the electrode assembly 110.

[0031] The electrode assembly 110 is a jelly roll-like structure consisting of a first electrode 111, a second electrode 113, and a separation membrane 112 wound between them, and a center pin 140 may be inserted in its center.

[0032] A cylindrical battery cell 100 can be formed by housing an electrode assembly 110 in a battery case 120, injecting an electrolyte into the battery case 120, and then attaching a cap assembly 130 to the upper end of the battery case 120. The battery case 120 is cylindrical, and the jelly-roll-shaped electrode assembly 110 is housed in the cylindrical battery case 120 to realize a cylindrical secondary battery.

[0033] The battery case 120 may include a beading section 122 and a crimping section 123.

[0034] The beading portion 122 is for the stable connection of the cap assembly 130 and can be formed circumferentially on the upper outer surface of the battery case 120, and can be formed so as to be recessed toward the center of the electrode assembly 110 on the outer surface of the battery case 120. The beading portion 122 can prevent the electrode assembly 110 from flowing.

[0035] The crimping portion 123 is positioned above the beading portion 122 and may be formed to wrap around the edge of the cap assembly 130 in the circumferential direction. The crimping portion 123 can ensure a stable bond of the cap assembly 130.

[0036] The cap assembly 130 may include an upper end cap 131 that forms the electrode terminals, a cap plate 132 to which the first electrode tab extending upward in the electrode assembly 110 is connected, and an airtight gasket 133.

[0037] The upper end cap 131 can form a positive terminal. The gasket 133 is attached to the upper inner surface of the crimping portion 123 and the beading portion 122, and can increase the sealing force between the cap assembly 130 and the battery case 120.

[0038] The first electrode tab 111c may extend upward in the electrode assembly 110. Specifically, it may extend from the first electrode 111 of the electrode assembly 110. The first electrode tab 111c may also be a positive electrode tab.

[0039] Such a first electrode tab 111c is connected to the cap plate 132, and the upper end cap 131 can function as an electrode terminal (positive electrode terminal). An opening 151 is formed in the upper insulating member 150, and the positive electrode tab can pass through the opening 151 and connect to the cap plate 132.

[0040] The center pin 140 generally contains a metal material to provide a certain strength and consists of a cylindrical structure formed by bending a plate into a round shape. In addition to self-heating, such a center pin 140 can fix and support the electrode assembly 110 and function as a passage for releasing gas generated by internal reactions during charging, discharging, and operation.

[0041] The electrolyte injected into the battery case 120 may be a lithium salt-containing non-aqueous electrolyte, which consists of a non-aqueous electrolyte and a lithium salt. Examples of non-aqueous electrolytes include non-aqueous organic solvents, organic solid electrolytes, and inorganic solid electrolytes, but are not limited to these.

[0042] The upper end cap 131 of the top of the battery case 120 is connected to the positive electrode tab of the electrode assembly 110 and can function as a positive electrode terminal, and the battery case 120 is connected to the negative electrode tab of the electrode assembly 110 and can function as a negative electrode terminal.

[0043] " The cylindrical battery cells 100 may be inserted into the pack housing 200, and the cylindrical battery cells 100 may be connected in series and / or parallel to each other by wire bonding with the busbars 300 in a predetermined pattern.

[0044] On the other hand, the present invention should not necessarily be interpreted as being limited to a battery pack 1000 to which cylindrical battery cells 100 are applied. For example, the battery pack 1000 according to the present invention can also be constructed using can-shaped battery cells that are not cylindrical but rectangular or of other shapes.

[0045] The pack housing 200 is a structure for housing and securing the battery cells 100 inside, protecting the battery cells 100 from external shocks and vibrations, and in this embodiment, it can be configured to include a bottom frame 220 and a top frame 210.

[0046] The bottom frame 220 may be formed in the shape of a square box, and the battery cells 100 can be housed inside the outer frame of the bottom frame 220. The battery cells 100 may be arranged so that the upper end cap 131 faces upward and the bottom of the battery case 120 faces downward.

[0047] The bottom frame 220 can be firmly connected to the top frame 210 by fastening hooks, as well as by long bolts (not shown) or the like.

[0048] The top frame 210 covers the upper area of ​​the battery cell 100 and may be configured to be interconnected with the bottom frame 220.

[0049] For example, the top frame 210 may be configured such that the upper area of ​​all battery cells 10 housed in the bottom frame 220 is covered by the top frame 21.

[0050] Furthermore, the top frame 210 may include a top surface that covers the top of all battery cells 100 and four side surfaces that form a wall surrounding the outside of all battery cells 100, together with the bottom frame 220. The top surface of the top frame 210 may have a number of holes 210a and anchoring grooves 210b, as shown in Figure 3. Side plates 230 may be attached to the side surfaces of the top frame 210.

[0051] The hole 210a may be formed by partially perforating the top frame 210 so that the upper end cap 131 of the battery cell 100 or the upper end of the battery case 120 is partially exposed to the outside.

[0052] As shown in Figure 3, in the bottom frame 220, the battery cells 100 may be configured to form multiple rows in the X-axis or Y-axis direction of the pack housing 200, and when such battery cells 100 are covered by the top frame 210, the upper end cap 131 of each battery cell 100 or the upper end of the battery case 120 may be exposed to the outside.

[0053] Such holes 210a are used as passages that allow battery cells 100 located inside the pack housing 200 to be connected to busbars 300 located outside the pack housing 200 with metal wires. For example, the busbars 300 can be connected to the upper end cap 131 or the upper end of the battery case 120, which is exposed through the holes 210a, with metal wires. For example, a wire bonding method can be employed in which one end of the metal wire is ultrasonically welded to the upper end cap 131 or the upper end of the battery case 120, and the other end of the metal wire is ultrasonically welded to the busbars 300.

[0054] The anchoring groove 210b is the location where the busbar 300 is anchored and fixed, and may extend along the longitudinal direction (Y-axis direction) of the pack housing 200, or may be provided at predetermined intervals along the width direction (X-axis direction) of the pack housing 200. A busbar 300, which is a straight-line metal conductor with the widths on both sides being the same, may be placed in each of these anchoring grooves 210b.

[0055] The bus bar 300 has a width approximately equal to that of the anchoring groove 210b, and can prevent flow in the width direction (X-axis direction).

[0056] Furthermore, pins or columns may be provided on the surface of the anchoring groove 210b, protruding (in the Z-axis direction), and pinholes may be provided in the busbar 300 into which the pins of the anchoring groove 210b are inserted. Thus, the flow can be blocked by inserting the pins of the anchoring groove 210b into the pinholes of the busbar 300.

[0057] Such busbars 300 may also be bonded to the adhesive grooves 210b of the top frame 210 using an adhesive such as glue.

[0058] Figures 6 and 7 show a battery pack 1000 according to another embodiment of the present invention. Figure 6 is a plan view of the battery pack according to another embodiment of the present invention, and Figure 7 is a partial plan view showing how battery cells are housed in the battery pack according to another embodiment of the present invention.

[0059] In another embodiment of the present invention, the battery pack 1000 may include a plurality of battery cells 100 and a pack housing 200, and may further include a refrigerant transfer pipe 275 through which a refrigerant for cooling the battery cells 100 is transported.

[0060] The pack housing 200 can house the battery cells 100, and the pack housing 200 may be a structure for protecting the battery cells 100 from external shocks and vibrations. The pack housing 200 may include a bottom frame 220, side walls 215, and a top frame 210.

[0061] The bottom frame 220 can be positioned at the bottom of the pack housing 200 and may, for example, be in the shape of a square plate. The bottom frame 220 may be positioned below the battery cell 100. The battery cell 100 may be positioned so that its upper end cap 131 faces upward and the bottom of the battery case 120 faces downward.

[0062] The side wall 215 may be positioned along the circumferential direction of the bottom frame 210 at the edge of the bottom frame 220.

[0063] The top frame 210 may cover the upper area of ​​the battery cell 100 and may be configured to be interconnected with the bottom frame 220.

[0064] Within the pack housing 200, multiple battery cells 100 may be arranged to form a battery cell assembly 10.

[0065] The battery cell assembly 10 may include multiple battery cells 100. In this embodiment, multiple battery cell assemblies 10 may be arranged within the pack housing 200, and Figure 6 shows an example in which two battery cell assemblies 10 are arranged within the pack housing 200.

[0066] The battery cell assembly 10 may be placed on the lower plate 250. Side walls 260 may be placed on both sides of the battery cell assembly 10. The side walls 260 may be positioned facing both edges of the lower plate 250. The side walls 260 may extend along the longitudinal direction of the battery cell assembly 10 and may be coupled to the pack housing 200.

[0067] Therefore, the battery cell assembly 10 can be placed on the lower plate 250 between the side walls 260, and the lower plate 250, the side walls 260, and the multiple battery cells 100 can constitute one battery cell assembly 10 as a set. A filling section 500 may be placed between the side walls 260 that constitute one battery cell assembly 10.

[0068] The lower plate 250 may be positioned at a predetermined distance from the bottom frame 220 of the pack housing 200.

[0069] The bottom frame 220 may include a plurality of convex portions 221 formed convexly upwards. The convex portions 221 may be integrally formed by the entire thickness of the bottom frame 220 being curved convexly upwards.

[0070] The lower plate 250 can be fixed to a plurality of protrusions 221, and a venting space S may be formed between the bottom frame 220 and the lower plate 250. Therefore, by forming a venting space between the lower plate 250 and the bottom frame 220, gas can move and be discharged through the venting space S in the event of a fire.

[0071] The lower plate 250 may be roughly rectangular in shape, and on the rectangular lower plate 250, the multiple battery cells 100 may be arranged in multiple rows, as shown in Figures 6 and 7.

[0072] In Figures 6 and 7, the first row of battery cells 100 may be arranged from left to right along the longitudinal direction (Y-axis direction) directly below the side wall 260 (in the figure). The second row of battery cells 100 may be arranged below the first row of battery cells 100 in the drawing, and each of the second row of battery cells 100 may be positioned between two of the first row of battery cells 100.

[0073] Furthermore, a cooling tube 270 may be placed between the first row of battery cells 100 and the second row of battery cells 100.

[0074] The cooling tube 270 may extend along a row of battery cells 100 (in the Y-axis direction), and a flow path for refrigerant may be formed inside it. The cooling tube 270 may be connected to a refrigerant transfer pipe 275. In this embodiment, the cooling tube 270 is positioned between a first row and a second row of battery cells 100, and can cool the sides of the battery cells 100 in the first row and the sides of the battery cells 100 in the second row. The cooling tube 270 can be formed in a curved manner along a portion of the outer circumferential surface of the battery cells 100 in the first row and a portion of the outer circumferential surface of the battery cells 100 in the second row.

[0075] The third row of battery cells 100 may be positioned below the second row of battery cells 100, and each of the third row of battery cells 100 may be positioned between two of the second row of battery cells 100.

[0076] Furthermore, a support member 280 may be placed between the second row of battery cells 100 and the third row of battery cells 100.

[0077] The support member 280 may extend along a row of battery cells 100 (in the Y-axis direction), or it may be formed in a staggered pattern as shown in the figure. The lower end of the support member 280 may be positioned on the lower plate, and the upper end of the support member 280 may extend to the upper end of the battery cells 100 or to the top frame 210.

[0078] The support member 280 is positioned between the two rows of battery cells 100 in this manner, allowing the battery cells 100 to be fixed in place and ensuring the rigidity of the battery pack 1000.

[0079] The fourth row of battery cells 100 may be positioned below the third row of battery cells 100, and a cooling tube 270 may again be positioned between the third and fourth rows of battery cells 100. Between the third and fourth rows of battery cells 100, the cooling tube 270 can cool the third row of battery cells 100 with one side and the fourth row of battery cells 100 with the other side.

[0080] Thus, cooling tubes 270 may be placed between odd-numbered and even-numbered rows of battery cells 100, and the two rows of battery cells on both sides of the cooling tubes 270 are cooled via one side and the other side of the cooling tubes 270.

[0081] Furthermore, support members 280 may be placed between even-numbered and odd-numbered rows of battery cells 100.

[0082] Thus, the multiple battery cells 100 constituting the battery cell assembly 10 may be arranged between the side walls 260, and the first, second, ... nth rows of battery cells 100 can be arranged sequentially from one side wall 260 toward the opposite side wall 260. Cooling tubes 270 and support members 280 may be arranged alternately between the multiple rows of battery cells 100.

[0083] Furthermore, in one embodiment of the present invention, the space between the battery cells 100 may be filled with a filling section 500. As shown in Figures 8 to 11, the filling section 500 may include resin layers 510, 530, 540 and foam layers 520, 550. The resin layers 510, 530, 540 and foam layers 520, 550 can be laminated together.

[0084] In Figures 8 and 9, the filling section 500 may include, from bottom to top, a first resin layer 510, a foam layer 520, and a second resin layer 530 between the battery cells 100.

[0085] The first resin layer 510 is located below the filling portion 500 and may be placed on the lower plate 250 on which the battery cells 100 are fixed. The first resin layer 510 can be formed by molten resin flowing into the space between the battery cells 100, filling the space between the battery cells 100, and then the filled resin hardening to form the first resin layer 510. The first resin layer 510 may be made of, for example, silicone resin, or may contain silicone resin. The first resin layer 510 may also be placed in the form of a resin pad.

[0086] The foam layer 520 is positioned in the middle of the filling section 500 and may be positioned above the first resin layer 510. The foam layer 520 may be made of foamed foam, for example, resin foamed foam, urethane foamed foam, or polyurethane foamed foam.

[0087] The thickness T2 of the foam layer 520 may be approximately 2 to 4 times, or even approximately 3 times, the thickness T1 of the first resin layer 510. This ratio of the foam layer 520 to the resin layers 510 and 530 ensures sufficient structural rigidity of the pack, while the resin layers 510 and 530 prevent thermal transfer between the upper and lower parts.

[0088] The foam layer 520, made of urethane foam or polyurethane foam, is a hard material with high rigidity and can play a significant role in securing the elements together and ensuring the structural rigidity of the pack. Furthermore, the foam layer 520 can mitigate external impacts, thus improving the vibration and impact resistance of the pack 1000.

[0089] The second resin layer 530 is positioned on top of the filling section 500 and may be positioned above the foam layer 520. The formation of the second resin layer 530 may be the same as that of the first resin layer 510. That is, molten resin may flow from above the foam layer 520 into the space between the battery cells 100, filling the space between the battery cells 100, and the filled resin can harden to form the second resin layer 530. The second resin layer 530 may, for example, be made of silicone resin or may contain silicone resin. The second resin layer 530 may also be positioned in the form of a resin pad. The upper end of the second resin layer 530 may also be in contact with the lower surface of the top frame 210.

[0090] The thickness T3 of the second resin layer 530 may be approximately 0.5 to 1.5 times the thickness T1 of the first resin layer 510, or it may be the same as or similar to the thickness T1 of the first resin layer 510.

[0091] In the filling section 500, the thickness ratio of the first resin layer 510, the foam layer 520, and the second resin layer 530 may, for example, be 1:3:1.

[0092] In this embodiment, the space between the battery cells 100 is filled with a filling section 500, and the filling section 500 includes a first resin layer 510 and a second resin layer 530 having flame retardant properties, and a foam layer 520 between them. This has the advantage of preventing thermal runaway (thermal propagation) based on the flame retardant properties, while simultaneously ensuring the rigidity of the pack.

[0093] Furthermore, when the foam layer 520 fills up to the top edge of the pack, controlling the foaming rate becomes difficult, posing a process risk. However, by placing the second resin layer 530 on top of the foam layer 520, this process difficulty is resolved, and effects such as protection of the upper weld and corrosion prevention can be achieved.

[0094] Furthermore, the first resin layer 510 is positioned at the bottom of the battery cell 100, and when cell venting occurs at the bottom, it can block the inflow of flames and high-temperature particles to adjacent cells, thereby preventing thermal runaway. The first resin layer 510 can also cover the lower end surface of the battery cell 100.

[0095] Since cooling tubes 270 or support members 280 are positioned between the battery cells 100, as shown in the figure, the filling portion 500 can fill not only the space between the battery cells 100, but also the space between the cooling tubes 270 and the battery cells 100, or the space between the support members 280 and the battery cells 100.

[0096] Furthermore, the resin layers 510 and 530 can improve thermal dispersion efficiency.

[0097] On the other hand, Figures 10 and 11 show a filling section 500 according to another embodiment of the present invention. Figure 10 is a longitudinal cross-sectional view of a battery pack according to another embodiment of the present invention, and Figure 11 is a detailed view of a part of Figure 10.

[0098] In Figures 10 and 11, the filling portion 500 may include a foam layer 550 and a resin layer 540 from the bottom.

[0099] In this embodiment, the foam layer 550 may be located below the filling section 500, or it may be located on the lower plate 250 on which the battery cell 100 is attached. The composition of the foam layer 550 may be the same as that of the foam layer 520 in the first embodiment. That is, the foam layer 550 may be made of foamed foam, for example, urethane foamed foam or polyurethane foamed foam.

[0100] In this embodiment, when the foam layer 550 is placed at the bottom of the cell 100, it is possible to prevent thermal runaway by ensuring rigidity and securing sufficient ventilation space S between the bottom frame 220 and the lower plate 250. Furthermore, the foam layer 550 can improve vibration resistance and impact resistance by mitigating external impacts.

[0101] The resin layer 540 may be positioned on top of the filling section 500 or on top of the foam layer 520. The formation of the resin layer 540 may be the same as that of the first resin layer 510 or the second resin layer 530. That is, molten resin can flow from above the foam layer 550 into the space between the battery cells 100, filling the space between the battery cells 100, and the filled resin can harden to form the resin layer 540. The composition of the resin layer 540 may be the same as or similar to that of the first resin layer 510 or the second resin layer 530. That is, the resin layer 540 may consist of, for example, silicone resin, or may contain silicone resin. The resin layer 540 may be positioned in the form of a resin pad. The upper end of the resin layer 540 may also be in contact with the lower surface of the top frame 210.

[0102] When the foam layer 550 fills the space between the battery cells 100 up to its upper edge, it becomes difficult to control the flatness and foaming rate, making it difficult to sufficiently and uniformly cover the upper surface of the cells 100. In this embodiment, by placing the resin layer 540 on top of the foam layer, this problem can be solved, and thermal propagation can be prevented based on the flame retardant properties.

[0103] The thickness T5 of the resin layer 540 may be approximately 0.3 to 0.8 times the thickness T4 of the foam layer 550, or it may be approximately 2 / 3 of the thickness T4 of the foam layer 550. By forming the foam layer 550 thicker than the resin layer 540 in this way, there are advantages in terms of rigidity and cost. In this embodiment, this ratio of the resin layer 540 to the foam layer 550 allows for stable implementation of both rigidity and thermal runaway prevention.

[0104] In the filling section 500, the thickness ratio of the resin layer 540 to the foam layer 550 may, for example, be 2:3. In another example, in the filling section 500, the resin layer 540 may be placed at the bottom and the foam layer 550 on top of it.

[0105] The thickness of the filling section 500 may be the same as or similar to the height of the battery cell 100. In other words, the thickness of the filling section 500 may be less than or greater than the height of the battery cell 100.

[0106] In another embodiment of the present invention, the filling portion 500 also includes a resin layer 540 and a foam layer 550, which has the advantage of preventing thermal propagation based on flame retardancy and simultaneously ensuring the rigidity of the battery pack 1000.

[0107] The battery pack 1000 may further include various control and protection systems such as a Battery Management System (BMS), and the battery pack 2000 can be applied to a variety of devices. Specifically, it can be applied to transportation methods such as electric bicycles, electric vehicles, and hybrid vehicles, as well as Energy Storage Systems (ESS), but is not limited to these, and can be applied to various devices that can use secondary batteries.

[0108] Figure 12 shows an electric vehicle V equipped with a battery pack 1000 (2000). In electric vehicle V, the wheels are driven by a motor powered by the battery pack 1000 (2000), allowing the electric vehicle to be operated.

[0109] Although the present invention has been described above with reference to preferred embodiments, it is not limited to the embodiments described above, and various modifications and alterations can be made by persons with ordinary skill in the art to which the invention pertains, without departing from the spirit of the invention. [Industrial applicability]

[0110] The present invention can provide a battery pack and an automobile in which resin and foam can be filled together into the empty space within the battery pack to prevent thermal transfer and ensure rigidity. [Explanation of Symbols]

[0111] 100 battery cells 200 Pack Housing 500 Filling section 1000, 2000 Battery Pack

Claims

1. Multiple battery cells, A pack housing for housing the aforementioned battery cells, A filling portion that fills the space between the battery cells within the pack housing, A battery pack characterized by including the following.

2. The battery pack according to claim 1, wherein the filling portion includes a resin layer and a foam layer.

3. The resin layer comprises a first resin layer and a second resin layer. The battery pack according to claim 2, wherein the foam layer is disposed between the first resin layer and the second resin layer.

4. Further including the lower plate, The battery pack according to claim 2, wherein the battery cells are arranged on the lower plate.

5. The aforementioned pack housing includes a bottom frame, The lower plate is spaced apart above the bottom frame. The battery pack according to claim 4, further comprising a bending space between the bottom frame and the lower plate.

6. The battery pack according to claim 2, wherein the resin layer comprises a silicone resin.

7. The battery pack according to claim 2, wherein the foam layer comprises urethane foam or polyurethane foam.

8. The pack housing further includes side walls arranged within the pack housing, The battery pack according to claim 2, wherein the battery cells are arranged between the two side walls.

9. The battery pack according to claim 3, wherein the thickness of the foam layer is 2 to 4 times the thickness of the first resin layer.

10. The battery pack according to claim 9, wherein the thickness of the second resin layer is 0.5 to 1.5 times the thickness of the first resin layer.

11. The battery pack according to claim 2, wherein the resin layer is disposed above the foam layer.

12. The battery pack according to claim 11, wherein the thickness of the resin layer is 0.3 to 0.8 times the thickness of the foam layer.

13. The battery pack according to claim 1, wherein the battery cell is a cylindrical cell.

14. The aforementioned battery cells are arranged in multiple rows, The battery pack according to claim 1, further comprising a cooling tube through which a refrigerant flows between two adjacent rows of the battery cells.

15. The aforementioned battery cells are arranged in multiple rows, The battery pack according to claim 1, further comprising a support member for supporting the battery cells between two adjacent rows of the battery cells.

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