Battery pack and device containing same

Abstract

A battery pack according to one embodiment of the present invention includes a battery cell stack in which a plurality of battery cells are stacked in one direction; a pack frame that houses the battery cell stack; and a thermal resin plate positioned between the battery cell stack and a bottom of the pack frame. A thermal resin layer formed by applying a thermal resin is positioned on one surface of the thermal resin plate, and the battery cell stack is fixed to the thermal resin layer. The thermal resin plate is detachably coupled to the pack frame.

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0120507, filed September 11, 2023, and all contents disclosed in the documents of this Korean patent application are incorporated herein by reference.

[0002] The present invention relates to a battery pack and a device including the same, and more particularly to a battery pack in which battery cells can be easily separated and a device including the same. [Background technology]

[0003] In modern society, the use of portable devices such as mobile phones, laptops, video cameras, and digital cameras has become commonplace, and the development of technologies related to these mobile devices is accelerating. Furthermore, rechargeable secondary batteries are a solution to air pollution caused by existing gasoline-powered vehicles that use fossil fuels, and are used as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (P-HEVs), etc., which has led to an increasing need for the development of secondary batteries.

[0004] Currently available secondary batteries on the market include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium secondary batteries. Of these, lithium secondary batteries are attracting attention due to their advantages over nickel-based secondary batteries, such as almost no memory effect, freedom in charging and discharging, an extremely low self-discharge rate, and high energy density.

[0005] Such lithium secondary batteries mainly use lithium-based oxides and carbon materials as the positive and negative electrode active materials, respectively, and include an electrode assembly in which a positive electrode plate and a negative electrode plate, each coated with the positive and negative electrode active materials, are disposed with a separator between them, and a battery case that seals and houses the electrode assembly together with an electrolyte.

[0006] Generally, lithium secondary batteries can be classified into can-type secondary batteries, in which an electrode assembly is housed in a metal can, and pouch-type secondary batteries, in which an electrode assembly is housed in a pouch made of an aluminum laminate sheet, depending on the shape of the exterior material.

[0007] While secondary batteries used in small devices typically have two or three battery cells, secondary batteries used in medium- to large-sized devices such as automobiles typically use battery modules in which multiple battery cells are electrically connected. These battery modules improve capacity and output by connecting multiple battery cells in series or parallel to form a stack of battery cells. Furthermore, one or more battery modules may be installed with various control and protection systems, such as a battery disconnect unit (BDU), battery management system (BMS), and cooling system, to form a battery pack.

[0008] In constructing a battery pack, it is common to first house battery cells in a module frame to prepare a battery module, and then use this battery module to add other components to construct the battery pack. In the case of a conventional battery pack, the battery module is manufactured by arranging it in a housing structure such as a pack frame, and this battery pack is then installed in a vehicle or the like.

[0009] However, in recent years, battery packs have been developed that do not require a module frame, and instead have a large number of battery cells positioned between side plates and directly attached to a pack frame.

[0010] FIG. 1 is a cross-sectional view showing a cross section of a conventional battery pack.

[0011] 1 , conventionally, a battery cell stack 12 is formed by stacking a large number of battery cells 11, and side plates 20 are disposed on both side surfaces of the battery cell stack 12 in the direction in which the battery cells 11 are stacked. The side plates 20 may be connected via connecting members 30.

[0012] Such a battery cell stack 12 can be immediately attached to the bottom 1100F of the pack frame 1100, and a thermal resin layer 50 formed by applying a thermal resin can be positioned between the battery cell stack 12 and the bottom 1100F of the pack frame 1100. Specifically, the thermal resin can be applied to the bottom 1100F of the pack frame 1100 to form the thermal resin layer 50, and the battery cell stack 12 can be placed on the thermal resin layer 50.

[0013] The thermal resin may include a thermally conductive adhesive material, specifically, at least one of silicone, urethane, and acrylic. Such a thermal resin layer 50 has excellent thermal conductivity and can quickly dissipate heat generated in the battery cells 11 to the outside. In addition, the thermal resin layer 50 becomes liquid when applied and hardens after application, thereby fixing the multiple battery cells 11 that make up the battery cell stack 12.

[0014] However, conventional battery packs have a problem in that the bonding reliability of the battery cells 11 to the pack frame 1100 is inconsistent when subjected to shock or vibration. Furthermore, when a problem occurs with a battery cell 11 and replacement is necessary, it is difficult to replace the battery cell 11 because the battery cell 11 is adhered to the thermal resin layer 50. In particular, if the battery cell 11 is replaced forcibly, the adhesive strength of the thermal resin layer 50 may cause damage to the battery cell 11.

[0015] This has led to a demand for technological developments for battery packs that can improve the reliability of battery cell connections and allow battery cells to be easily replaced as needed. Summary of the Invention [Problem to be solved by the invention]

[0016] The problem to be solved by the present invention is to provide a battery pack and a device including the same in which the battery cells have excellent bonding reliability when subjected to shock or vibration and in which the battery cells can be easily replaced as needed.

[0017] However, the problems to be solved by the embodiments of the present invention are not limited to the above-mentioned problems, and can be variously expanded within the scope of the technical ideas included in the present invention. [Means for solving the problem]

[0018] A battery pack according to one embodiment of the present invention includes a battery cell stack in which a plurality of battery cells are stacked in one direction; a pack frame that houses the battery cell stack; and a thermal resin plate positioned between the battery cell stack and a bottom of the pack frame. A thermal resin layer formed by applying a thermal resin to one surface of the thermal resin plate is positioned, and the battery cell stack is fixed to the thermal resin layer.

[0019] The thermal resin plate may be detachably coupled to the pack frame. The battery cells may be formed in a sheet shape having a certain thickness, and the battery cells may be vertically disposed on one surface of the bottom of the pack frame.

[0020] The one direction in which the battery cells are stacked may be parallel to one surface of the bottom of the pack frame.

[0021] The thermal resin plate may be coupled to the pack frame by a bolt and nut fastening method.

[0022] A bolt may be attached to the underside of the thermal resin plate, a hole may be formed in the bottom of the pack frame, and the bolt may pass through the hole and be fastened with a nut.

[0023] The bolt may be welded to the lower surface of the thermal resin plate.

[0024] A cooling passage through which a coolant flows may be formed inside the bottom of the pack frame, and the bolts and the holes in the bottom may be positioned so as to avoid the cooling passage.

[0025] The thermal resin plate may have a recess formed on the surface thereof, the recess having a recessed shape corresponding to a lower portion of the battery cell.

[0026] The indentation may be configured in plurality, and the plurality of indentations may be positioned in one-to-one correspondence with the battery cells.

[0027] The battery cell may be secured to the indentation.

[0028] A cooling channel through which a coolant flows may be formed inside the bottom of the pack frame.

[0029] A device according to an embodiment of the present invention includes the battery pack. [Effects of the Invention]

[0030] According to an embodiment of the present invention, the battery cells are located in a thermal resin layer on a thermal resin plate, and the thermal resin plate is detachably connected to the pack frame, so that the battery cells have excellent bonding reliability and can be easily replaced when necessary.

[0031] The effects of the present invention are not limited to the effects described above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims. [Brief explanation of the drawings]

[0032] [Figure 1] FIG. 1 is a cross-sectional view showing a cross section of a conventional battery pack. [Figure 2] FIG. 2 is an exploded perspective view showing a battery cell stack, a side plate, a connecting member, and a thermal resin plate according to one embodiment of the present invention. [Figure 3] 3 is a plan view showing one of the battery cells included in the battery cell stack of FIG. 2. FIG. [Figure 4] 1 is a perspective view showing a battery pack according to an embodiment of the present invention; [Figure 5] FIG. 5 is a cross-sectional view showing a cross section taken along the line AA' in FIG. 4. [Figure 6] FIG. 6 is an enlarged partial view of part “B” in FIG. 5. [Figure 7] 5 is a cross-sectional view showing a cross section taken along the line CC' in FIG. 4. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0033] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, in which: FIG. 1 is a block diagram of a semiconductor device according to an embodiment of the present invention;

[0034] In order to clearly describe the present invention, parts not necessary for the description will be omitted and the same reference numerals will be used throughout the specification to refer to the same or similar components.

[0035] Furthermore, the size and thickness of each component shown in the drawings are arbitrarily shown for the convenience of explanation, and the present invention is not necessarily limited to those shown. In the drawings, the thicknesses of some layers and regions are exaggerated to clearly show them. In the drawings, the thicknesses of some layers and regions are exaggerated for the convenience of explanation.

[0036] Furthermore, when a layer, film, region, plate, or other part is said to be "on" or "above" another part, this does not only mean that it is "directly above" that part, but also includes cases where there are other parts between them. Conversely, when a part is said to be "directly above" another part, it means that there are no other parts between them. Furthermore, being "on" or "above" a reference part means being located above or below the reference part, and does not necessarily mean being located "above" or "above" the direction opposite to gravity.

[0037] Furthermore, throughout the specification, when a part is said to "comprise" a certain element, this does not mean to exclude other elements, but means that other elements may also be included, unless otherwise specified.

[0038] Also, throughout the specification, "on a plane" means a view of the subject part from above, and "on a cross section" means a view of the subject part cut vertically from the side.

[0039] Fig. 2 is an exploded perspective view showing a battery cell stack, side plates, connecting members, and a thermal resin plate according to one embodiment of the present invention. Fig. 3 is a plan view showing one of the battery cells included in the battery cell stack of Fig. 2. Fig. 4 is a perspective view showing a battery pack according to one embodiment of the present invention. In particular, Fig. 4 illustrates the battery cell stack 120 and other components of Fig. 2 mounted on a pack frame 1100.

[0040] 2 to 4, a battery pack 1000 according to one embodiment of the present invention includes a battery cell stack 120 in which a plurality of battery cells 110 are stacked in one direction; a pack frame 1100 that houses the battery cell stack 120; and a thermal resin plate 400 positioned between the battery cell stack 120 and a bottom 1100F of the pack frame 1100.

[0041] The battery cell 110 according to this embodiment is formed in a sheet shape with a certain thickness, and may be arranged vertically on one surface of the bottom 1100F of the pack frame 1100. For example, the battery cell 110 may be a pouch-type battery in which an electrode assembly having electrode leads 111 protruding in one or both directions is housed in a pouch case 114. However, this is just one example, and a battery cell according to another embodiment of the present invention may be a prismatic battery cell.

[0042] For convenience of explanation, the following description will be based on the battery cell 110 of the pouch-type battery.

[0043] The battery cell 110 may be formed in a rectangular sheet shape. The battery cell 110 may be formed by housing an electrode assembly in a pouch case 114 made of a laminate sheet including a resin layer and a metal layer, and then bonding the outer periphery of the pouch case 114. As an example, the battery cell 110 may have a structure in which two electrode leads 111 face each other and protrude from one end 114a and the other end 114b of the cell body 113, respectively. As another example, the electrode leads 111 of the battery cell 110 may all protrude in one direction. One of the electrode leads 111 is a positive electrode lead, and the other is a negative electrode lead.

[0044] The battery cell 110 can be manufactured by bonding both ends 114a, 114b of the pouch case 114 and one side 114c connecting them together while an electrode assembly (not shown) is housed in the pouch case 114. In other words, the battery cell 110 according to an embodiment of the present invention has a total of three sealing portions 114s, which are sealed by a method such as fusion, and the remaining side portions can be formed by folding portions 115. That is, in the battery cell 110 according to this embodiment, the electrode assembly is housed inside the pouch case 114, and the pouch case 114 has a sealing portion 114s formed by sealing the outer periphery of the portion where the electrode assembly is housed. 3 shows only the sealing portions 114s formed on both ends 114a and 114b of the pouch case 114, and does not show a sealing portion on the top edge facing the folding portion 115, i.e., one side 114c, but the sealing portion on one side 114c is folded to one side after sealing is completed to save space. The folded one side 114c is also shown in FIG. 5, which will be described below.

[0045] The laminate sheet pouch case 114 may include an inner resin layer for sealing, a metal layer for preventing penetration of substances, and an outermost resin layer. Based on the electrode assembly inside the pouch case 114, the inner resin layer may be located innermost, the outer resin layer may be located outermost, and the metal layer may be located between the inner and outer resin layers.

[0046] The outer resin layer has excellent tensile strength and resistance to corrosion relative to its thickness to protect the electrode assembly from the outside and can exhibit electrical insulation. This outer resin layer can include polyethylene terephthalate (PET) resin or nylon resin. The metal layer can prevent air, moisture, etc. from entering the pouch-type secondary battery. This metal layer can include aluminum (Al). The inner resin layer can be heat-sealed by applying heat and / or pressure with the electrode assembly inside. This inner resin layer can include cast polypropylene (CPP) or polypropylene (PP).

[0047] The pouch case 114 may be divided into two sections, and at least one of the two sections may have a recessed storage section in which an electrode assembly can be attached. The inner resin layers of the two sections of the pouch case 114 may be joined together along the outer periphery of the storage section to form a sealing section 114s. In this manner, the pouch case 114 is sealed, and the battery cell 110, which is a pouch-type battery, can be manufactured.

[0048] A plurality of battery cells 110 are configured, and the plurality of battery cells 110 are stacked so as to be electrically connected to each other to form a battery cell stack 120. In particular, as shown in Fig. 2, the plurality of battery cells 110 can be stacked in one direction parallel to the y-axis while standing upright so that one surface of each cell body 113 (see Fig. 3) faces each other.

[0049] That is, the battery cells 110 may be arranged vertically on one surface of the bottom 1100F of the pack frame 1100. Also, one direction in which the battery cells 110 are stacked may be parallel to one surface of the bottom 1100F of the pack frame 1100. The electrode leads 111 may protrude in a direction perpendicular to the direction in which the battery cells 110 are stacked. That is, in a battery cell 110, one electrode lead 111 may protrude in the x-axis direction, and the other electrode lead 111 may protrude in the negative x-axis direction. In the case of a battery cell in which the electrode leads 111 protrude in only one direction, the electrode leads 111 protrude in the x-axis direction or the negative x-axis direction.

[0050] Meanwhile, the battery cell stack 120 may be provided with a minimal separate frame protecting the outer surfaces of the battery cells 110. That is, the battery cell stack 120 of this embodiment may have a cell-to-pack structure. Here, the cell-to-pack structure may also refer to a module-less structure in which a battery cell structure is directly coupled to a battery pack structure without a module frame.

[0051] Typically, a conventional battery pack 1000 has a double-assembly structure in which a battery module is formed by assembling a plurality of battery cells and various components connected thereto, and the plurality of battery modules are then housed in the battery pack 1000. Since the battery module includes a module frame that forms its outer surface, the conventional battery cells are doubly protected by the module frame of the battery module and the pack frame 1100 of the battery pack 1000. However, such a double-assembly structure not only increases the manufacturing cost and manufacturing process of the battery pack 1000, but also reduces reassembly if some battery cells are defective. Furthermore, if a cooling element is present outside the battery module, the heat transfer path between the battery cells and the cooling element becomes somewhat complicated.

[0052] In contrast to this, in this embodiment, the unit modules attached to the battery pack 1000 can be provided in the form of a "battery cell stack" that omits the module frame. This makes it possible to simplify the structure of the battery pack 1000, providing advantages in terms of the manufacturing cost and manufacturing process, and achieving a reduction in the weight of the battery pack 1000.

[0053] The battery pack 1000 according to this embodiment may include side plates 200 disposed on both sides of the battery cell stack 120 in the stacking direction of the battery cells 110. The battery pack 1000 may further include a connecting member 300 connecting the side plates 200.

[0054] The side plates 200 are located on both sides of the battery cell stack 120 so as to support the battery cell stack 120. More specifically, the side plates 200 can be located on both sides in the direction in which the plurality of battery cells 110 are stacked, i.e., in the direction parallel to the y-axis in FIG. 2 .

[0055] The connecting member 300 may be a band member that connects the side plates 200 to the upper part of the battery cell stack 120. The connecting member 300, which is a band member, may include an elastic metal material and may be provided in one or more. When multiple connecting members 300 are provided, they may be spaced apart at regular intervals. As an example, FIGS. 2 and 4 show three connecting members 300 arranged on the upper side of the battery cell stack 120. However, this connecting member 300 is merely an exemplary structure and does not necessarily need to be provided in the battery pack 1000. That is, in another embodiment of the present invention, only side plates 200 may be provided on both sides of the battery cell stack 120 without any connecting members.

[0056] In this embodiment, the battery cell stack 120 is not housed and sealed in a module frame, but side plates 200 are disposed on both sides of the battery cell stack 120 and fixed via connecting members 300. In other words, compared to conventional battery modules, this embodiment does not require a module frame and can be directly attached to a battery pack without a sealed module frame.

[0057] Fig. 5 is a cross-sectional view showing a cross section cut along the cutting line A-A' in Fig. 4. Fig. 6 is a partial view showing an enlarged view of part "B" in Fig. 5. In particular, Fig. 5 is a cross-sectional view showing a part where bolts 600 are provided on thermal resin plate 400.

[0058] Referring to Figures 2, 4, 5 and 5, when the battery cell stack 120 is mounted on the bottom 1100F of the pack frame 1100, the thermal resin plate 400 according to this embodiment is positioned between the battery cell stack 120 and the bottom 1100F of the pack frame 1100.

[0059] The pack frame 1100 may be a box-shaped structure with an open top that houses the battery cell stack 120. A pack cover (not shown) may be located on the open top of the pack frame 1100. In addition, at least one vertical beam 1200 for fixing the position of the battery cell stack 120 may be located on the bottom 1100F of the pack frame 1100.

[0060] A thermal resin layer 500 formed by applying thermal resin to one surface of the thermal resin plate 400 is positioned, and the battery cell stack 120 is fixed to the thermal resin layer 500 .

[0061] The thermal resin may include a thermally conductive adhesive material, specifically, at least one of silicone, urethane, and acrylic. The thermal resin layer 500 has excellent thermal conductivity and can quickly dissipate heat generated in the battery cells 11 to the outside. In addition, the thermal resin layer 500 has adhesive properties, so it can fix the multiple battery cells 11 that make up the battery cell stack 120.

[0062] The thermal resin plate 400 according to this embodiment is detachably coupled to the pack frame 1100. The thermal resin plate 400 may be a plate having a predetermined thickness and may be made of a plastic material, a metal material, or an insulating-coated metal material. For example, the thermal resin plate 400 and the pack frame 1100 may be coupled to each other by a mechanical fastening method.

[0063] 1 has a structure in which the battery cells 11 are directly bonded to the bottom 1100F of the pack frame 1100 via the thermal resin layer 50, which causes a problem of inconsistent bonding reliability between the battery cells 11 and the pack frame 1100 when subjected to shock or vibration. Furthermore, if a problem occurs with the battery cells 11 and replacement is required, it is difficult to replace the battery cells 11 because they are bonded to the thermal resin layer 50. In particular, if the battery cells 11 are replaced forcibly, the adhesive strength of the thermal resin layer 50 may cause damage to the battery cells 11.

[0064] Meanwhile, in the battery pack 1000 according to this embodiment, the battery cell stack 120 is bonded to the thermal resin plate 400 via the thermal resin layer 500, and the thermal resin plate 400 is detachably coupled to the bottom 1100F of the pack frame 1100. Therefore, because the thermal resin plate 400 is coupled to the pack frame 1100, the bonding reliability of the battery cells 110 to the pack frame 1100 can be maintained even when subjected to shock or vibration. Furthermore, if a problem occurs in one of the battery cells 110 and replacement is required, the thermal resin plate 400 can be separated from the pack frame 1100 to easily separate the battery cell stack 120 containing the problematic battery cell 110 and replace it with another one. In other words, the battery pack 1000 according to this embodiment has the advantage that replacing the battery cells 110 is not particularly difficult.

[0065] An example of the manner in which the thermal resin plate 400 and the pack frame 1100 are joined together will be described below.

[0066] The thermal resin plate 400 according to an embodiment of the present invention may be coupled to the pack frame 1100 by a fastening method using bolts 600 and nuts 700. The bolts 600 may be attached to the underside of the thermal resin plate 400. As an example, the bolts 600 may be welded to the underside of the thermal resin plate 400. A hole 1100H may be formed in the bottom 1100F of the pack frame 1100, and the bolts 600 may pass through the holes 1100H in the bottom 1100F of the pack frame 1100 and be fastened to the nuts 700.

[0067] As long as the thermal resin plate 400 can be firmly fixed to the pack frame 1100, there is no particular limitation on the size or number of the bolts 600 joined to the underside of the thermal resin plate 400.

[0068] The thermal resin plate 400 can be coupled to the pack frame 1100 by passing the bolt 600 through the hole 1100H in the bottom 1100F of the pack frame 1100 and fastening it with the nut 700. Then, thermal resin can be applied to one surface of the thermal resin plate 400 to form the thermal resin layer 500, and the battery cell 110 can be mounted on the thermal resin layer 500. If a problem occurs with the battery cell 110 and it needs to be replaced, the bolt 600 and nut 700 can be released, and the battery cell 110 and thermal resin plate 400 can be easily separated from the pack frame 1100.

[0069] Meanwhile, a recessed portion 400D may be formed on one surface of the thermal resin plate 400 to correspond to the bottom of the battery cell 110. A plurality of recesses 400D may be formed, and the recesses 400D may be positioned in one-to-one correspondence with the battery cells 110 in the battery cell stack 120. Each battery cell 110 may be fixed in the recess 400D. Specifically, each battery cell 110 may be attached to the thermal resin layer 500 on the recess 400D.

[0070] 3, the battery cell 110 has one side 114c and a folding portion 115, and in a folded state, the sealing portion of the one side 114c may face up and the folding portion 115 may face down. The indented portion 400D of the thermal resin plate 400 according to this embodiment may have an indented shape corresponding to the shape of the folding portion 115 of the battery cell 110. By forming the indented portion 400D in the thermal resin plate 400, the battery cell 110 can be more strongly attached to the thermal resin layer 500. The indented portion 400D may be formed on the thermal resin plate 400 by a forging process.

[0071] Fig. 7 is a cross-sectional view showing a cross section cut along the cutting line CC' in Fig. 4. In particular, Fig. 7 is a cross-sectional view showing a portion where cooling channel 1100C is formed in bottom portion 1100F of pack frame 1100.

[0072] 4, 5, and 7, a cooling channel 1100C can be formed inside the bottom 1100F of the pack frame 1100 according to this embodiment. A coolant (C) for cooling the battery cell stack 120 can flow through this cooling channel 1100C. The coolant can be cooling water, for example. The battery pack according to this embodiment can have a water-cooled cooling structure. Heat generated in the battery cells 110 can be discharged to the outside through the cooling channel 1100C of the bottom 1100F via the thermal resin layer 500 and the thermal resin plate 400.

[0073] As long as effective cooling of the battery cell stack 120 is possible, there are no particular limitations on the width, number, or area of ​​the cooling channels 1100C. However, it is preferable that the cooling channels 1100C be located in a location that does not interfere with the bolts 600 and the holes 1100H in the bottom 1100F described above. Specifically, the bolts 600 and the holes 1100H in the bottom 1100F according to this embodiment can be positioned to avoid the cooling channels 1100C. That is, the holes 1100H in the bottom 1100F can be formed in a portion of the bottom 1100F where the cooling channels 1100C do not pass. More specifically, when the bottom 1100F is viewed in a direction perpendicular to one surface of the bottom 1100F, the bolts 600 and the holes 1100H in the bottom 1100F can be located in a portion where the cooling channels 1100C are not formed. Here, the direction perpendicular to one surface of the bottom 1100F may be parallel to the z-axis in the drawing. Since the bolt 600 passes through such a hole 1100H, the bolt 600 can be positioned so as to avoid the cooling flow passage 1100C.

[0074] Meanwhile, in the battery cell stack 120 according to this embodiment, a compression pad 800 may be interposed at least at one location between the battery cells 110. The compression pad 800 is an elastic member and can absorb swelling of the battery cells 110.

[0075] In this embodiment, terms indicating directions such as front, back, left, right, up, and down are used, but these terms are used for convenience of explanation and may change depending on the position of the target object, the position of the observer, etc.

[0076] The battery cell stack according to the present embodiment can be mounted together with various control and protection systems such as a BMS (Battery Management System), a BDU (Battery Disconnect Unit), and a cooling system to form a battery pack.

[0077] The battery pack can be applied to various devices, specifically, but not limited to, transportation means such as electric bicycles, electric vehicles, and hybrid vehicles, and ESS (Energy Storage Systems), and can be applied to various devices that can use secondary batteries.

[0078] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the claims below also fall within the scope of the present invention. [Explanation of symbols]

[0079] 110 battery cells 120 Battery cell stack 200 Side Plate 300 Connecting member 400 Thermal Resin Plate 500 Thermal resin layer 600 volts 700 Nut 1000 battery packs 1100 Pack Frame

Claims

1. a battery cell stack in which a plurality of battery cells are stacked in one direction; a pack frame that houses the battery cell stack; and a thermal resin plate positioned between the battery cell stack and the bottom of the pack frame; a thermal resin layer formed by applying a thermal resin to one surface of the thermal resin plate is positioned, and the battery cell stack is fixed to the thermal resin layer; The thermal resin plate is detachably coupled to the pack frame.

2. The battery cell is formed in a sheet shape having a certain thickness, The battery pack according to claim 1 , wherein the battery cells are arranged vertically on one side of the bottom of the pack frame.

3. The battery pack according to claim 1 , wherein the one direction in which the battery cells are stacked is parallel to one surface of the bottom of the pack frame.

4. The battery pack according to claim 1 , wherein the thermal resin plate is coupled to the pack frame by a bolt and nut fastening method.

5. A bolt is joined to the lower surface of the thermal resin plate, a hole formed in the bottom of the pack frame; The battery pack according to claim 4 , wherein the bolt passes through the hole and is fastened with a nut.

6. The battery pack according to claim 5 , wherein the bolt is welded to the lower surface of the thermal resin plate.

7. a cooling flow path through which a refrigerant flows is formed inside the bottom of the pack frame; The battery pack of claim 5 , wherein the bolt and the hole in the bottom are positioned to avoid the cooling channel.

8. The battery pack according to claim 1 , wherein the one surface of the thermal resin plate is formed with an indented portion having an indented shape corresponding to a lower portion of the battery cell.

9. The indentation is composed of a plurality of indentations, The battery pack according to claim 8 , wherein the plurality of indentations are positioned in one-to-one correspondence with the battery cells.

10. The battery pack according to claim 8 , wherein the battery cell is fixed to the indentation.

11. The battery pack according to claim 1 , wherein a cooling channel through which a coolant flows is formed inside the bottom of the pack frame.

12. A device comprising the battery pack of claim 1.

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