Battery module, battery pack including same, and automobile

Abstract

A battery module according to one embodiment of the present invention includes a plurality of battery cells, a module housing that accommodates the plurality of battery cells, and a heat dissipation pad accommodated within the module housing, located on at least one side of the plurality of battery cells, and having at least one recess in which a liquid resin is injected.

Description

[Technical field]

[0001] The present invention relates to a battery module, a battery pack including the battery module, and an automobile. This application claims priority to Korean Patent Application No. 10-2021-0187838 filed on December 24, 2021, the entire contents of which are incorporated herein by reference in their entirety in the specification and drawings of that application. [Background technology]

[0002] Secondary batteries, which have high applicability to various products and electrical properties such as high energy density, are commonly used not only in portable devices but also in electric vehicles (EVs) and hybrid electric vehicles (HEVs) that are driven by electric drive sources. These secondary batteries are attracting attention as a new energy source for improving energy efficiency, as they are environmentally friendly, not only because they can dramatically reduce the use of fossil fuels, but also because they do not produce any by-products due to the use of energy.

[0003] Currently, types of secondary batteries that are widely used include lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel metal hydride batteries, and nickel zinc batteries. The operating voltage of such a unit secondary battery cell, i.e., a unit battery cell, is about 2.5V to 4.5V. Therefore, when a higher output voltage is required, a battery pack may be configured by connecting a plurality of battery cells in series. Also, depending on the charge / discharge capacity required for the battery pack, a battery pack may be configured by connecting a plurality of battery cells in parallel. Therefore, the number of battery cells included in the battery pack may be variously set depending on the required output voltage and / or charge / discharge capacity.

[0004] On the other hand, conventional battery packs include multiple battery cells, and in such cases, liquid heat dissipation resin may be applied to cool the battery cells due to their irregular shapes. However, in this case, the liquid resin is difficult to handle and takes a long time to harden.

[0005] Meanwhile, in conventional battery packs, a solid heat dissipation material may be used to cool a simple shaped part, but the solid heat dissipation material has a problem of reducing cooling efficiency because it is difficult to fill gaps in an irregularly shaped cooling part.

[0006] Therefore, in cooling a battery pack, there is a need to find a heat dissipation pad that can be applied to cooling an irregular shape, has a short operation time, and is easy to handle. Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to smoothly cool a battery module in accordance with the irregular shapes of a plurality of battery cells housed inside the battery module.

[0008] In another aspect, the present invention aims to reduce the work time required for applying a heat dissipation material during the manufacturing process of a battery module.

[0009] In still another aspect, it is another object of the present invention to facilitate handling during manufacture of a battery module.

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

[0011] In order to solve the above-mentioned problems, a battery module according to one embodiment of the present invention includes a plurality of battery cells, a module housing that accommodates the plurality of battery cells, and a heat dissipation pad that is accommodated within the module housing, is located on at least one side of the plurality of battery cells, has at least one recess, and has a shape in which a liquid resin is injected into the recess.

[0012] Preferably, the heat dissipation pad has elasticity.

[0013] Preferably, the Shore OO hardness of the heat dissipation pad may be in the range of 50HS to 90HS.

[0014] In one aspect of the present invention, a step formed on one side of the battery cells may cause the thermal pad to deform under pressure, thereby forming a predetermined space between the battery cells and the thermal pad.

[0015] Here, the battery module may include a liquid resin layer having a predetermined thickness, the liquid resin being formed by flowing out of a liquid resin located in the recess into a predetermined space formed between the plurality of battery cells and the heat dissipation pad.

[0016] In another aspect of the present invention, the recess may have a hole.

[0017] In still another aspect of the present invention, the recessed portion may have a groove shape extending linearly.

[0018] In another aspect of the present invention, the heat dissipation pad may include a first pad in direct contact with the plurality of battery cells, and a second pad located on the opposite side of the plurality of battery cells with respect to the first pad and in contact with the first pad.

[0019] Here, the elastic force of the first pad may be greater than the elastic force of the second pad.

[0020] In another embodiment of the present invention, the recess may be provided only in the first pad.

[0021] In still another embodiment of the present invention, the liquid resin may be a curable liquid resin that hardens over time.

[0022] In another aspect of the present invention, the battery module may further include a heat sink that is included inside the module housing and dissipates heat generated in the battery cells to the outside.

[0023] Preferably, the heat dissipation pad may be interposed between the plurality of battery cells and the heat sink.

[0024] Meanwhile, the present invention provides a battery pack, the battery pack including at least one battery cell according to the above-mentioned aspect.

[0025] The present invention further provides a motor vehicle, the motor vehicle including at least one battery pack according to one of the above aspects. Effect of the Invention

[0026] According to one aspect of the present invention, in cooling a battery module, even if a plurality of battery cells housed inside the battery module have an irregular shape, the battery module can be smoothly cooled.

[0027] According to another aspect of the present invention, the time required for applying a heat dissipation material during the manufacturing process of a battery module can be reduced.

[0028] According to still another aspect of the present invention, handling during manufacture of the battery module can be facilitated.

[0029] However, the effects obtained by the present invention are not limited to the effects described above, and other technical effects not mentioned will be clearly understood by those of ordinary skill in the art from the following description of the invention.

[0030] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention, serve to further understand the technical ideas of the present invention. Therefore, the present invention should not be interpreted as being limited only to the matters described in the drawings. [Brief description of the drawings]

[0031] [Figure 1] 1 is a diagram for explaining a battery module according to an embodiment of the present invention; [Diagram 2] FIG. 2 is an exploded perspective view of FIG. [Diagram 3] 2 is a diagram for explaining a battery cell included in the battery module of FIG. 1. [Figure 4] 1 is a diagram illustrating a heat dissipation pad according to an embodiment of the present invention; [Diagram 5] 1 is a diagram illustrating a heat dissipation pad into which liquid resin is injected according to an embodiment of the present invention; [Figure 6] 4 is a diagram illustrating a state before a battery cell is applied to a thermal pad according to an embodiment of the present invention; FIG. [Figure 7] 1 is a diagram illustrating a state in which a battery cell is applied to a heat dissipation pad according to an embodiment of the present invention; [Figure 8] 11 is a view illustrating a state in which liquid resin flows out after a battery cell is applied to a thermal pad according to an embodiment of the present invention. FIG. [Figure 9] 11A and 11B are diagrams illustrating a heat dissipation pad according to another embodiment of the present invention. [Figure 10] 11 is a view illustrating a thermal pad according to still another embodiment of the present invention; FIG. [Figure 11] 11A to 11C are diagrams for explaining a process for manufacturing the thermal pad of FIG. [Figure 12] 11 is a view illustrating a thermal pad according to still another embodiment of the present invention; FIG. [Figure 13] 2 is a diagram for explaining a battery pack including the battery module of FIG. 1. [Figure 14] FIG. 14 is a diagram for explaining an automobile including the battery pack of FIG. 13. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings. Prior to this, the terms and words used in this specification and claims are not to be construed as being limited to their general and dictionary meanings, but are to be construed as being in accordance with the meaning and concept of the technical idea of ​​the present invention, in accordance with the principle that the inventor himself can appropriately define the concept of the term in order to best describe the invention. Therefore, it should be understood that the configurations shown in the embodiments described in this specification are merely the most preferred embodiment of the present invention, and do not represent the entire technical idea of ​​the present invention, and therefore there may be various equivalents and modifications that can be substituted therefor at the time of this application.

[0033] In addition, in order to facilitate understanding of the invention, the accompanying drawings may not be drawn to scale and the dimensions of some components may be exaggerated.

[0034] Fig. 1 is a diagram for explaining a battery module 10 according to one embodiment of the present invention, and Fig. 2 is an exploded perspective view of Fig. 1. Fig. 3 is a diagram for explaining a battery cell included in the battery module of Fig. 1, Fig. 4 is a diagram for explaining a heat dissipation pad according to one embodiment of the present invention, and Fig. 5 is a diagram for explaining a heat dissipation pad into which liquid resin has been injected.

[0035] 1 to 5, a battery module 10 according to one embodiment of the present invention may include a plurality of battery cells 100, a module housing 200, and a heat dissipation pad 300.

[0036] Here, the battery cell 100 may be a pouch-type secondary battery, a prismatic secondary battery, or a cylindrical secondary battery as a secondary battery. Hereinafter, in the present embodiment, the description will be limited to the case where the battery cells 100 are provided as pouch-type secondary batteries as secondary batteries. However, it goes without saying that the present invention is not limited to the above embodiment, and a cylindrical secondary battery or a prismatic secondary battery can also be applied to the present invention. Meanwhile, as shown in FIG. 1, in one embodiment of the present invention, the battery cells 100 may be arranged to be stacked on each other along the width direction of the battery cells 100.

[0037] The module housing 200 may accommodate a plurality of battery cells 100. The module housing 200 may accommodate a heat dissipation pad 300.

[0038] The thermal pad 300 may be accommodated in the module housing 200 and positioned on at least one side of the plurality of battery cells 100. Referring to Figures 4 and 5, the thermal pad 300 may have at least one recess C. The recess C may be filled with a liquid resin R.

[0039] The thermal pad 300 may be in a solid form, so that the overall shape of the thermal pad 300 is maintained and thermal conduction between the thermal pad 300 and the heat sink 500, which will be described later, can be minimized.

[0040] Here, the thermal pad 300 can transfer heat generated in the battery cell 100 to the outside. For example, the thermal pad 300 can include a thermal interface material (TIM). The thermal interface material can be, for example, at least one of a thermal grease, a thermally conductive adhesive, and a phase change material. The thermal pad 300 can increase a contact area with the module housing 200 or a heat sink 500 described below. This can improve thermal conductivity.

[0041] Meanwhile, the liquid resin R may be a thermally conductive liquid resin R. That is, the liquid resin R may transfer heat generated in the battery cell 100 to the outside. The liquid resin R may be interposed between the battery cell 100 and the module housing 200 to fix the battery cell 100 in a predetermined position.

[0042] According to this structure, the liquid resin R is injected only into a part of the heat dissipation pad 300, so that the curing time of the liquid resin R can be shortened. For example, if the amount of the liquid resin R is large, it takes a long time to cure, so that the work efficiency may be reduced. However, according to the present invention, the liquid resin R is injected only into at least one recess C provided in the heat dissipation pad 300, so that the amount of the liquid resin R applied to the present invention can be kept relatively small. As a result, the time required for curing can be significantly shortened, and the work efficiency can be improved. Furthermore, the handling during the manufacturing work of the battery module 10 can be made easier.

[0043] Furthermore, according to the above-mentioned structure, the entire surface of the battery cell 100 can be covered with the liquid resin R in a liquid form. Therefore, the contact area between the battery cell 100 and the liquid resin R or between the battery cell 100 and the heat dissipation pad 300 can be maximized. This maximizes the cooling efficiency. That is, according to the present invention, in cooling the battery module 10, even if the multiple battery cells 100 housed inside the battery module 10 have an irregular shape, the battery module 10 can be smoothly cooled.

[0044] Also, referring to FIG. 1, the thermal pad 300 may have elasticity. For example, the hardness of the thermal pad 300 may be in the range of about 40 [HS] to 95 [HS] in Shore OO hardness. The Shore hardness means a hardness defined by a rebound height after dropping an indenter on a surface of an object. If the hardness of the thermal pad 300 is less than about 40 [HS] in Shore OO hardness, the thermal pad 300 cannot be processed and maintained in shape, and it may be difficult to use. On the other hand, if the hardness of the thermal pad 300 exceeds about 95 [HS] in Shore OO hardness, the thermal pad 300 does not adhere to the deviation or shape of the battery cell 100 but maintains only its original shape, which may make it difficult to apply to the present invention. Therefore, the hardness of the thermal pad 300 may be in the range of about 40 [HS] to 95 [HS] in Shore OO hardness. Preferably, the hardness of the thermal pad 300 may be in the range of about 50 [HS] to 90 [HS] in Shore OO hardness, and more preferably, the hardness of the thermal pad 300 may be in the range of about 10 [HS] to 60 [HS] in Shore A hardness.

[0045] In this way, according to the configuration in which the thermal dissipation pad 300 has elasticity within the above hardness range, even if there are irregularities and steps in the components of the portion in contact with the thermal dissipation pad 300, the thermal dissipation pad 300 can be deformed into a shape corresponding to the irregularities and steps. That is, in the present invention, the thermal dissipation pad 300 can be deformed into a shape corresponding to the step shape of the stack of battery cells 100 in contact with the thermal dissipation pad 300. This makes it possible to maximize the contact area between the battery cells 100 and the thermal dissipation pad 300. In addition, the cooling efficiency can also be maximized. That is, according to the present invention, in cooling the battery module 10, even if the multiple battery cells 100 housed inside the battery module 10 have an irregular shape, the battery module 10 can be smoothly cooled.

[0046] Fig. 6 is a diagram for explaining a state before the battery cell 100 is applied to the thermal pad 300 according to an embodiment of the present invention, and Fig. 7 is a diagram for explaining a state after the battery cell 100 is applied to the thermal pad 300 according to an embodiment of the present invention. Fig. 8 is a diagram for explaining a state after the liquid resin R flows out after the battery cell 100 is applied to the thermal pad 300 according to an embodiment of the present invention.

[0047] 6, a liquid resin R is poured into a recess C provided in a thermal dissipation pad 300 according to an embodiment of the present invention. A plurality of battery cells 100 may be attached to the upper portion of the thermal dissipation pad 300 in a direction toward the thermal dissipation pad 300.

[0048] Referring to FIG. 7, a plurality of battery cells 100 may be mounted on the thermal pad 300. At this time, the thermal pad 300 may be partially compressed due to the load of the plurality of battery cells 100. Alternatively, the plurality of battery cells 100 may be press-fitted and fixed to the thermal pad 300 during the manufacturing process of the battery module 10. That is, the thermal pad 300 may be compressed due to the load or additional pressure of the battery cells 100. In particular, the thermal pad 300 may be deformed under pressure due to a step formed on one side of the stack of the plurality of battery cells 100, and a predetermined space may be formed between the plurality of battery cells 100 and the thermal pad 300. The predetermined space may be temporarily formed and then filled with a liquid resin R. FIG. 7 is a view for explaining a state in which the predetermined space is temporarily formed.

[0049] For example, the pouch-type battery cells 100 as shown in FIG. 3 may be arranged so as to be stacked on one another in the width direction (direction parallel to the X-axis) of the battery cells 100. In this case, some error may occur between the battery cells 100 in the height direction (direction parallel to the Z-axis) of the battery cells 100 during the stacking process. For example, as shown in FIG. 1 and FIG. 6, an error may occur in which the battery cells 100 are arranged to be misaligned with each other in the height direction (direction parallel to the Z-axis) of the battery cells 100. For example, the error may be about 3 mm or less. When the battery cells 100 are stacked within this range, at least a part of the battery cell 100 may come into contact with the thermal pad 300 due to deformation of the thermal pad 300. As a result, the battery module 10 can be smoothly cooled despite the partially irregular arrangement of the plurality of battery cells 100.

[0050] Referring to FIG. 8, the liquid resin R located in the recess C may flow out into a predetermined space formed between the plurality of battery cells 100 and the heat dissipation pad 300. As a result, the liquid resin R can be provided with a liquid resin layer 400 having a predetermined thickness. In this manner, the liquid resin layer 400 is provided on the upper portion of the heat dissipation pad 300, so that one side of the plurality of battery cells 100 having an irregular shape can be entirely covered with the liquid resin R. Therefore, the contact area between the battery cell 100 and the liquid resin R or between the battery cell 100 and the heat dissipation pad 300 can be maximized. This maximizes the cooling efficiency. That is, according to the present invention, in cooling the battery module 10, even if the plurality of battery cells 100 accommodated inside the battery module 10 have an irregular shape, the battery module 10 can be smoothly cooled.

[0051] In another aspect of the present invention, the liquid resin layer 400 is poured into the recess C of the heat dissipation pad 300, so that its volume may be relatively small compared to the heat dissipation pad 300. Therefore, the amount of liquid resin R is small, and the curing time of the liquid resin layer 400 can be shortened. As a result, the time required for curing can be significantly shortened, and the work efficiency can be improved. Furthermore, the handling during the manufacturing work of the battery module 10 can be made easier.

[0052] FIG. 5 is a diagram illustrating a heat dissipation pad 300 into which liquid resin R according to one embodiment of the present invention has been poured, and FIG. 9 is a diagram illustrating a heat dissipation pad 300 according to another embodiment of the present invention.

[0053] 5 and 9, the recess C may have a hole shape. However, the shape of the recess C is not limited to a circular shape, and it goes without saying that any shape is possible as long as the recess C is recessed to a partial or full depth from the upper portion of the thermal pad 300.

[0054] 5, the recess C may be recessed only partially without penetrating the thermal pad 300. In another embodiment, the recess C may be recessed through the thermal pad 300 as shown in FIG.

[0055] 5, in the form in which the recess C does not completely penetrate the heat dissipation pad 300, the liquid resin R does not flow down to the bottom of the heat dissipation pad 300 even after the liquid resin R is injected, which makes it easier to handle during the process. Also, since the shape can be maintained to some extent even before hardening after injection, the time required to proceed to the next process can be shortened.

[0056] 9, according to a configuration in which the recess C penetrates the heat dissipation pad 300, a relatively large amount of liquid resin R can be injected. In this case, when the heat dissipation pad 300 is subsequently compressed and the liquid resin R flows out to form the liquid resin layer 400, even if the step error of the stack of battery cells 100 is relatively large, the entire area exposed by the step of the stack of battery cells 100 can be covered.

[0057] FIG. 10 is a view illustrating a thermal pad 300 according to still another embodiment of the present invention, and FIG. 11 is a view illustrating a process for manufacturing the thermal pad 300 of FIG.

[0058] 10 and 11, the thermal pad 300 may include a first pad 310 in direct contact with the battery cells 100, and a second pad 320 located on the opposite side of the battery cells 100 with respect to the first pad 310 and in contact with the first pad 310. That is, the thermal pad 300 may be formed by combining the first pad 310 and the second pad 320.

[0059] In one embodiment of the present invention, the recess C may be provided only in the first pad 310. For example, referring to FIG. 11, the first pad 310 may be provided with at least one recess C, and the second pad 320 may not be provided with a recess C. The recess C provided in the first pad 310 may penetrate the first pad 310, or may be partially recessed without penetrating. The first pad 310 and the second pad 320 may be joined vertically. Then, the liquid resin R may be injected into the recess C provided in the first pad 310. According to the thermal pad 300 of this type, even after the liquid resin R is injected, the second pad 320 prevents the liquid resin R from flowing down under the thermal pad 300, making it easy to handle during the process. In addition, the second pad 320 can maintain the overall shape even before hardening after injection, thereby shortening the time required to proceed to the next process.

[0060] In another embodiment of the present invention, the elasticity of the first pad 310 may be greater than that of the second pad 320. That is, the hardness of the first pad 310 may be less than that of the second pad 320. According to this structure, the first pad 310, which directly contacts the battery cell 100, has a greater elasticity and a lower hardness, so that the first pad 310 can easily deform in response to the step of the stack of battery cells 100. At the same time, the second pad 320 has a smaller elasticity and a higher hardness, so that the second pad 320 can firmly support the battery cell 100.

[0061] In another embodiment of the present invention, the first pad 310 and the second pad 320 may be made of the same material, so that the first pad 310 and the second pad 320 may have the same elasticity and / or hardness.

[0062] FIG. 12 is a diagram illustrating a thermal pad 300 according to still another embodiment of the present invention.

[0063] 12, the recess C may have a groove shape extending linearly. In this manner, when the recess C has a groove shape extending linearly, even if a step occurs in the stack of the battery cells 100, the side surface of the pouch-type battery cell 100 extending in the length direction can be easily covered.

[0064] 3, the battery cell 100 may include an electrode assembly 110, a receiving portion 130 receiving the electrode assembly 110, a sealing portion 150 formed around the receiving portion 130, and a pair of electrode leads 170 connected to the electrode assembly 110 and drawn out to the outside of the sealing portion 150. The pair of electrode leads 170 may be coupled to electrode tabs (not shown) provided on the electrode assembly 110 and drawn out to the outside of the sealing portion 150 through the sealing portion 150. The pair of electrode leads 170 may have a shape extending along the length direction of the battery cell 100. The pair of electrode leads 170 may be drawn out in the same direction or in opposite directions.

[0065] In one embodiment of the present invention, the liquid resin R may be a curable liquid resin R that hardens over time. For example, referring to FIG. 8, the liquid resin R that flows out of the recess C of the heat dissipation pad 300 may form a liquid resin layer 400 of a predetermined thickness and then harden. That is, the liquid resin R may harden in a state in which it covers all the exposed areas of the battery cells 100 that are generated due to the steps of the stack of the battery cells 100. As a result, the multiple battery cells 100 can be stably fixed by the cured liquid resin layer 400. The curable liquid resin R may be, for example, a one-component liquid resin R or a two-component liquid resin R. The one-component liquid resin R means a liquid resin R that hardens over time without a separate hardener. The two-component liquid resin R means a liquid resin R that hardens by adding a separate hardener. The curing method may be, for example, UV curing, moisture curing, etc., but is not limited thereto.

[0066] Since the curable liquid resin R is in a liquid state before curing, it can be cured in a state where the contact area between the battery cells 100 and the liquid resin R is maximized. Since the liquid resin R has a heat dissipation function, such a structure can maximize the cooling efficiency. That is, according to the present invention, in cooling the battery module 10, even if the multiple battery cells 100 housed inside the battery module 10 have an irregular shape, the battery module 10 can be smoothly cooled.

[0067] The liquid resin R may include, for example, a urethane-based and / or silicone-based material. When including such a material, the liquid resin R can efficiently transfer heat generated in the battery cell 100 to the outside. In addition, the liquid resin R can effectively fix the battery cell 100 at a predetermined position within the module housing 200.

[0068] In another embodiment of the present invention, the liquid resin R can be provided not only in the recess C of the heat dissipation pad 300 but also in other regions inside the module housing 200. For example, the liquid resin R can be filled into the empty space inside the module housing 200. With such a structure, the positions of the battery cells 100 in the module housing 200 can be more reliably fixed, and the safety of the battery module 10 can be improved.

[0069] In another embodiment of the present invention, the thermal dissipation pad 300 into which the liquid resin R is injected may be provided not only on the lower part of the battery cell 100 but also on the upper part and / or side part. For example, in the case where the thermal dissipation pad 300 is provided on the upper part of the battery cell 100, a plurality of battery cells 100 are fixed on the thermal dissipation pad 300, the liquid resin R is cured, and then the fixed battery cells 100 and the thermal dissipation pad 300 are turned upside down, and finally, the thermal dissipation pad 300 is provided on the upper part of the battery cell 100. This is because if the thermal dissipation pad 300 is immediately attached on the upper part of the battery cell 100, the liquid resin R may flow down to the battery cell 100 side due to gravity before the liquid resin R is cured.

[0070] 6 to 8, the battery module 10 may further include a heat sink 500 that is included in the module housing 200 and dissipates heat generated in the battery cells 100 to the outside.

[0071] For example, the module housing 200 may include a lower frame 210 disposed under the plurality of battery cells, a side frame 230 disposed on a side of the plurality of battery cells, and an upper frame 250 covering the upper portion of the plurality of battery cells. Here, the heat sink 500 may be provided on the lower frame 210 of the module housing 200.

[0072] For example, referring to FIG. 8, the thermal dissipation pad 300 may be interposed between the plurality of battery cells 100 and the heat sink 500. That is, the heat sink 500 may be disposed below the thermal dissipation pad 300 disposed below the battery module 10. Therefore, the heat transferred from the battery cells 100 to the thermal dissipation pad 300 may also be transferred to the heat sink 500. Furthermore, the heat sink 500 may transfer the heat transferred from the thermal dissipation pad 300 to another coolant or air. In this way, according to a structure in which the battery module 10 further includes the heat sink 500, the heat dissipation effect of the battery module 10 may be further improved.

[0073] FIG. 13 is a diagram for explaining the battery pack 1 including the battery module 10 of FIG.

[0074] 13, the battery pack 1 according to the present invention may include at least one battery module 10 according to the present invention. The battery pack 1 according to the present invention may include a pack case 50 capable of accommodating the at least one battery module 10. In addition to the battery module 10, the battery pack 1 may further include various other components, for example, components of the battery pack 1 known at the time of filing of the present invention, such as a BMS, a pack case, a relay, a current sensor, etc.

[0075] FIG. 14 is a diagram for explaining an automobile V including the battery pack 1 of FIG.

[0076] Referring to FIG. 14, an automobile V according to the present invention may include at least one battery pack 1 according to the present invention.

[0077] According to the various embodiments of the present invention as described above, even if the battery cells 100 housed inside the battery module 10 have an irregular shape, the battery module 10 can be smoothly cooled. In addition, since the amount of the liquid resin R applied to the present invention can be kept relatively small, the time required for hardening can be significantly shortened and the work efficiency can be improved. Furthermore, the battery module 10 can be easily handled during the manufacturing work.

[0078] Therefore, according to the various embodiments of the present invention as described above, it is possible to provide a battery module 10 having improved cooling and fixing performance, a battery pack 1 including the battery module 10, and an automobile V.

[0079] Meanwhile, although terms indicating directions such as up and down are used in this specification, such terms are merely for convenience of explanation, and it will be obvious to those skilled in the art of the present invention that such terms may change depending on the position of the target object, the position of the observer, etc.

[0080] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited thereto, and it goes without saying that various modifications and variations can be made by a person having ordinary knowledge in the technical field to which the present invention pertains within the technical spirit of the present invention and the equivalent scope of the claims described below. [Explanation of symbols]

[0081] V Automobile 1 Battery pack 10 Battery Module 50 pack case 100 Battery Cells 110 Electrode assembly 130 Storage unit 150 Sealing part 170 Electrode Lead 200 module housing 210 Lower Frame 230 Side Frame 250 Upper Frame 300 Heat dissipation pad C recess R Liquid resin 310 1st Pad 320 2nd Pad 400 Liquid resin layer 500 Heatsink

Claims

1. A plurality of battery cells; a module housing that houses the plurality of battery cells; a heat dissipation pad accommodated in the module housing, the heat dissipation pad being located on at least one side of the plurality of battery cells, the heat dissipation pad having at least one recess, and a liquid resin being provided in the recess; Equipped with a predetermined space is formed between the battery cells and the thermal pad when the thermal pad is deformed by pressure due to a step formed on one side of the battery cells; The battery module is characterized in that it includes a liquid resin layer formed in a predetermined space between the plurality of battery cells and the heat dissipation pad, the liquid resin located in the recess being in a flowing state.

2. The battery module according to claim 1 , wherein the heat dissipation pad has elasticity.

3. The battery module according to claim 1 , wherein the heat dissipation pad has a Shore OO hardness in the range of 50HS to 90HS.

4. A battery module as described in claim 1, wherein the liquid resin layer is characterized in that the liquid resin has a predetermined thickness.

5. The battery module according to claim 1 , wherein the recess has a hole.

6. The battery module according to claim 1 , wherein the recess has a groove shape extending linearly.

7. The heat dissipation pad is a first pad in direct contact with the plurality of battery cells; a second pad located on an opposite side of the plurality of battery cells with respect to the first pad and in contact with the first pad; The battery module according to claim 2 , comprising:

8. The battery module according to claim 7 , wherein the elasticity of the first pad is greater than the elasticity of the second pad.

9. The battery module according to claim 7 , wherein the recess is provided only in the first pad.

10. The battery module according to claim 1 , further comprising a heat sink (120) that is included inside the module housing (120) and that dissipates heat generated in the battery cells (120) to the outside.

11. The battery module according to claim 10, wherein the heat dissipation pad is interposed between the plurality of battery cells and the heat sink.

12. 12. The battery module according to claim 1, wherein the liquid resin is a curable liquid resin that hardens over time.

13. The battery module according to claim 12 , wherein the liquid resin is in a hardened state after being poured into the recess.

14. A battery pack comprising at least one battery module according to claim 1.

15. A motor vehicle comprising at least one battery pack as defined in claim 14.

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