Battery module and manufacturing method thereof

Abstract

The present invention provides a battery module, which includes: a plurality of battery cells, which are arranged to be stacked on each other in a thickness direction; a battery case, which accommodates the battery cells and has an open bottom structure; and a heat dissipation member, which has a cover plate and a heat dissipation body, the cover plate being connected to the lower portion of the battery case to support the battery cells, and the heat dissipation body being provided on one surface of the cover plate supporting the battery cells to dissipate heat generated in the battery cells, wherein the heat dissipation body includes: a first heat transfer material, which is provided to be connected to the center of one surface of the cover plate in the longitudinal direction of the battery cells; and a second heat transfer material, which is provided on both sides of the first heat transfer material and has a structure arranged in multiple columns in the longitudinal direction of the battery cells, wherein the second heat transfer material has a structure that gradually narrows from the center of the battery cells to both ends of the battery cells, thereby improving the heat dissipation performance from the center of the battery cells to both ends of the battery cells.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2020-0070473, filed on June 10, 2020, which is hereby incorporated by reference in its entirety. Technical Field

[0003] The present invention relates to a battery module and a method for manufacturing the battery module, and more particularly, to a battery module that improves heat dissipation performance of battery cells and reduces temperature deviation, and a method for manufacturing the battery module. Background Art

[0004] Generally speaking, secondary batteries are rechargeable and dischargeable, unlike non-rechargeable primary batteries. They are widely used in mobile phones, laptop computers and camcorders, power storage devices, electric vehicles, etc.

[0005] Such secondary batteries are classified into can-type secondary batteries in which an electrode assembly is built into a metal can and pouch-type secondary batteries in which an electrode assembly is built into a pouch. A pouch-type secondary battery includes an electrode assembly in which electrodes and separators are alternately stacked and a pouch housing the electrode assembly.

[0006] As fossil fuels are depleted and concerns about environmental pollution increase, research on hybrid vehicles and electric vehicles has been actively conducted in recent years, and a battery pack is mounted on each of the hybrid vehicle or the electric vehicle.

[0007] A battery pack includes a battery module including a plurality of battery cells, and the plurality of battery cells are connected to each other in series or in parallel to improve capacity and output.

[0008] However, as capacity and output increase, the battery modules generate more heat, and thus, if the heat generated from the battery modules is not smoothly released to the outside, the battery modules may deteriorate, catch fire, and explode. Summary of the Invention

[0009] Technical issues

[0010] The present invention has been developed to address the above-mentioned problems. According to the present invention, the heat dissipation structure of a battery module can be improved to smoothly discharge heat generated in the battery module to the outside, thereby improving the heat dissipation performance of the battery module. In particular, the present invention aims to provide a battery module capable of reducing temperature deviation throughout the battery module, and a method for manufacturing the battery module.

[0011] Technical Solutions

[0012] A battery module according to the present invention for achieving the above-mentioned object includes: a plurality of battery cells arranged to be stacked on each other in a thickness direction of the plurality of battery cells; a battery case configured to accommodate the battery cells and having a structure with an open lower portion; and a heat dissipation member including a cover plate and a heat dissipation body, the cover plate being coupled to a lower portion of the battery case to support the battery cells, the heat dissipation body being disposed on one surface of the cover plate supporting the battery cells to dissipate heat generated in the battery cells, wherein the heat dissipation body includes: a first heat transfer material disposed to be connected to a center of one surface of the cover plate in a longitudinal direction of the battery cells; and a second heat transfer material disposed on two portions of the first heat transfer material and having a structure arranged in a plurality of columns in the longitudinal direction of the battery cells, the second heat transfer materials being arranged such that a spacing between the second heat transfer materials gradually narrows from a center toward both ends of the battery cells, so as to gradually improve heat dissipation performance from the center toward both ends of the battery cells.

[0013] The cover plate may include: a first accommodating groove provided at the center of one surface of the cover plate and having a structure connected in the longitudinal direction of the battery cell; and a second accommodating groove provided in both sides of the first accommodating groove in the thickness direction of the battery cell and having a structure in which a spacing between the second accommodating grooves gradually narrows from the center toward both ends of the battery cell, and

[0014] The first heat transfer material is disposed in the first accommodation groove, and the second heat transfer material is disposed in the second accommodation groove.

[0015] Since the first accommodating groove and the second accommodating groove are formed to be connected to each other, the first heat transfer material and the second heat transfer material may be integrally connected to each other.

[0016] An insulating member having insulation properties may be provided on one surface of the cap plate except for the first and second receiving grooves.

[0017] A pair of heat dissipation pads may be respectively provided on both ends of the inner surface of the battery case, the pair of heat dissipation pads reducing a temperature deviation between a center and both ends of the battery cell by releasing heat generated at both ends of the battery cell.

[0018] A trimming pad may be provided on the inner surface of the battery case between the pair of heat dissipation pads, the trimming pad trimming a space between the pair of heat dissipation pads.

[0019] The first receiving groove may be provided to have a depth gradually increasing from the center toward both ends of the battery cell, and the first heat transfer material provided in the first receiving groove may be provided to have a thickness gradually increasing from the center toward both ends of the battery cell.

[0020] The depth can gradually increase from the second accommodating groove arranged at the center of the battery cell toward the second accommodating groove arranged at each of the two ends of the battery cell, and each second heat transfer material arranged in the second accommodating groove can be arranged to have a thickness that gradually increases from the center of the battery cell toward the two ends.

[0021] The method for manufacturing a battery module according to the present invention includes: an arranging step of arranging a plurality of battery cells to overlap each other in a thickness direction; an accommodating step of accommodating the overlapping plurality of battery cells in a battery case with an open lower portion; a preparing step of preparing a heat dissipation member, the heat dissipation member including a cover plate and a heat dissipation body, the heat dissipation body being provided on one surface of the cover plate supporting the battery cells; and a coupling step of coupling the cover plate of the heat dissipation member to the lower portion of the battery case and supporting the heat dissipation body on the battery cells, wherein the preparing step includes: a preparing process of preparing a cover plate; a forming process of extruding one surface of the cover plate to form a first accommodating groove and a second accommodating groove; and an injecting process of injecting a heat transfer solution into the first accommodating groove and the second accommodating groove to manufacture the heat dissipation body, wherein The heat dissipation body includes a first heat transfer material formed in the first accommodating groove and a second heat transfer material formed in the second accommodating groove. During the formation process, the first accommodating groove is formed to be connected to the center of one surface of the cover plate in the longitudinal direction of the battery cell, and the second accommodating groove is arranged in each of the two parts of the first accommodating groove and is formed to have a structure arranged in multiple columns in the longitudinal direction of the battery cell. The second accommodating groove is formed so that the spacing between the second accommodating grooves gradually narrows from the center of the battery cell toward both ends on one surface of the cover plate, and the second heat transfer material arranged in the second accommodating groove has such a structure that the spacing between the second heat transfer materials gradually narrows from the center of the battery cell toward both ends.

[0022] During the forming process, the first accommodating groove and the second accommodating groove can be formed to be connected to each other, and during the injection process, since the first accommodating groove and the second accommodating groove are connected to each other, a heat sink in which the first heat transfer material and the second heat transfer material are integrally connected to each other can be manufactured.

[0023] The method may further include, between the forming process and the injecting process, an attaching process of attaching an insulating member having insulation properties to one surface of the cap plate at locations other than the first and second accommodating recesses.

[0024] The accommodating step may further include a process of respectively attaching heat dissipation pads each having heat dissipation performance to both ends of the inner surface of the battery case corresponding to both ends of the battery cell.

[0025] The receiving step may further include a process of attaching a finishing pad to the inner surface of the battery case between the heat dissipation pads.

[0026] Beneficial effects

[0027] The battery module according to the present invention may include a plurality of battery cells, a battery housing, and a heat dissipation member comprising a cover plate and a heat sink. The heat sink may include a first heat transfer material and a second heat transfer material arranged in multiple rows. Due to the above features, heat generated in the battery cells can be smoothly released through the first and second heat transfer materials, thereby significantly suppressing the temperature increase of the battery module.

[0028] In particular, the second heat transfer materials can be arranged so that the spacing between the second heat transfer materials gradually narrows from the center of the battery cell toward the ends. Due to this feature, the heat dissipation performance can be gradually improved from the center to the ends of the battery cell, thereby reducing the temperature deviation from the center to the ends of the battery cell, thereby improving the performance of the battery module.

[0029] In addition, in the battery module according to the present invention, the cover plate may include a first receiving groove and a second receiving groove formed into a concave shape. The first heat transfer material may be disposed in the first receiving groove, and the second heat transfer material may be disposed in the second receiving groove. Due to the above features, the first heat transfer material and the second heat transfer material can be efficiently disposed.

[0030] In addition, in the battery module according to the present invention, an insulating member having insulating properties can be provided on one surface of the cover plate in addition to the first and second receiving grooves. Due to this feature, the occurrence of a short circuit caused by contact between the battery cells and the cover plate can be prevented in advance, thereby improving safety.

[0031] In addition, in the battery module according to the present invention, the first accommodating groove may have a depth that gradually increases from the center toward both ends of the battery cell. Due to the above-mentioned feature, the first heat transfer material disposed in the first accommodating groove may have a height that gradually increases from the center toward both ends of the battery cell. Thus, the heat dissipation performance at both ends of the battery cell can be improved compared to the center of the battery cell, and as a result, the temperature deviation of the entire battery cell can be reduced.

[0032] In addition, in the battery module according to the present invention, the second accommodating groove may have a depth that gradually increases from the center toward both ends of the battery cell. Due to the above-mentioned feature, the second heat transfer material disposed in the second accommodating groove may have a height that gradually increases from the center toward both ends of the battery cell. Thus, the heat dissipation performance at both ends of the battery cell can be improved compared to the center of the battery cell, and as a result, the temperature deviation of the entire battery cell can be reduced.

[0033] In addition, in the battery module according to the present invention, a pair of heat dissipation pads can be provided at both ends of the inner surface of the battery housing. Due to the above features, the heat dissipation performance at both ends of the upper portion of the battery cell can be significantly improved, thereby significantly reducing the temperature deviation of the entire battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a perspective view of a battery module according to a first embodiment of the present invention.

[0035] Figure 2 is a cross-sectional view of a battery module according to a first embodiment of the present invention.

[0036] Figure 3 is a perspective view showing a heat dissipation member of a battery module according to a first embodiment of the present invention.

[0037] Figure 4 is a plan view showing a heat dissipation member of a battery module according to a first embodiment of the present invention.

[0038] Figure 5 It is along Figure 4 A cross-sectional view taken along line AA.

[0039] Figure 6 It is along Figure 4 A cross-sectional view taken along line BB.

[0040] Figure 7 It is along Figure 4 A cross-sectional view taken along line CC.

[0041] Figure 8 FIG. 1 is a perspective view of a heat dissipation pad and a finishing pad in a battery module according to a first embodiment of the present invention.

[0042] Figure 9 is a flowchart illustrating a method for manufacturing a battery module according to a first embodiment of the present invention.

[0043] Figures 10 to 13 is a flowchart illustrating preparation steps of a method for manufacturing a battery module according to a first embodiment of the present invention.

[0044] Figure 14 is a cross-sectional view showing a heat dissipation member of a battery module according to a second embodiment of the present invention.

[0045] Figure 15 is a cross-sectional view showing a heat dissipation member of a battery module according to a third embodiment of the present invention. DETAILED DESCRIPTION

[0046] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the technical ideas of the present invention. However, the present invention can be implemented in different forms and should not be construed as being limited to the embodiments described herein. In the accompanying drawings, any content that is not necessary for describing the present invention will be omitted for clarity, and the same reference numerals in the drawings indicate the same elements.

[0047] [Battery Module According to First Embodiment of the Invention]

[0048] like Figures 1 to 8 As shown in FIG, in a battery module 100 according to a first embodiment of the present invention, an improved heat dissipation structure is employed to enhance the heat dissipation performance of the battery cells and reduce temperature deviation of the entire battery cell structure. The battery module 100 includes: a plurality of battery cells 110 arranged to overlap one another in the thickness direction of the battery module 100; a battery housing 120 housing the battery cells 110 and having an open lower portion; and a heat dissipation member 130 coupled to the lower portion of the battery housing 120 to release heat generated in the plurality of battery cells 110 housed in the battery housing 120 to the outside.

[0049] Here, in the battery module 100 according to the first embodiment of the present invention, as an embodiment, the heat dissipation member is coupled to the lower portion of the battery housing, but depending on the application of the product, the heat dissipation member may be provided at the upper portion, side, front or rear portion of the battery housing.

[0050] battery cells

[0051] The battery cell 110 includes an electrode assembly, an electrode lead connected to the electrode assembly, and a pouch case accommodating the electrode assembly in a state in which a front end of the electrode lead is pulled out.

[0052] The battery cell 110 having the above-described configuration is provided in plural, the battery cells are arranged to overlap each other in the thickness direction, and the plurality of battery cells 110 arranged in the thickness direction have a structure in which the plurality of battery cells 110 are connected in series or in parallel.

[0053] battery housing

[0054] The battery case 120 is configured to accommodate a plurality of battery cells and has a rectangular box shape with an opening formed in a lower portion thereof. A plurality of battery cells 110 overlapped with each other are accommodated in the battery case 120 through the opening.

[0055] Each battery cell 110 is housed in the battery case 120 in a state where the electrode lead faces an end portion in the longitudinal direction of the battery case 120 and stands upright.

[0056] heat dissipation components

[0057] The heat dissipation member 130 includes a cover plate 131 that supports the battery cells 110 accommodated in the battery case 120 and a heat dissipation body 132 that releases heat generated in the battery cells 110 to the outside.

[0058] The cap plate 131 may be coupled to a lower portion of the battery case 120 to form the lower portion of the battery case 120 , and also support lower portions of the battery cells 110 accommodated in the battery case 120 to prevent the battery cells 110 from being pulled out to the outside.

[0059] In particular, the cover plate 131 is made of a heat dissipation material that can smoothly release the heat of the battery cells transferred from the heat dissipation body.

[0060] The heat sink 132 is provided on one surface of the cap plate 131 supporting the battery cell 110 to absorb heat generated in the battery cell 110 and release the heat to the outside. Thus, the heat of the battery cell 110 can be effectively dissipated.

[0061] In particular, the heat sink 132 includes: a first heat transfer material 132a, which is arranged in the longitudinal direction of the battery cell (when Figure 4The left and right directions of the cover plate when viewed in the middle) are connected to the center of one surface of the cover plate 131; and a second heat transfer material 132b, which is provided at two parts of the first heat transfer material 132a (when in Figure 4 At each portion of the upper and lower portions of the first heat transfer material when viewed in the middle, and having a longitudinal direction of the battery cell (when viewed in the middle Figure 4 The structure is arranged in multiple rows (in the left and right directions of the cover when viewed from the center).

[0062] Each of the first heat transfer material 132a and the second heat transfer material 132b can be configured to contact a thermal interface material (TIM) and have adhesive properties. Specifically, at least one of heat dissipation grease, thermally conductive adhesive, or phase change material can be used as each of the first heat transfer material 132a and the second heat transfer material 132b.

[0063] The heat sink 132 having the above-mentioned structure can be applied differently to the center of the battery cell 110 that generates a relatively large amount of heat and the two overlapping parts of the battery cell 110 that generate relatively less heat than the center of the battery cell 110. Thus, the heat dissipation performance of the battery cell 110 can be improved, and the temperature deviation between the center of the battery cell 110 and the two parts can be reduced.

[0064] In the battery cell 110, due to the high resistance of the electrode lead, relatively high heat is generated at both ends compared to the center of the battery cell 110. The second heat transfer material 132b is arranged to reduce the temperature deviation of the battery cell 110.

[0065] Specifically, the second heat transfer materials 132b are arranged in multiple columns, with the spacing between the second heat transfer materials 132b gradually narrowing from the outer center point (the point that bisects the battery cell in the longitudinal direction) toward the two ends (the two longitudinal endpoints of the battery cell). Consequently, more second heat transfer materials 132b are placed at the ends of the battery cell, which generate high-temperature heat, to significantly improve heat dissipation performance, while less second heat transfer materials 132b are placed in the center of the battery cell, which generates low-temperature heat, to slightly improve heat dissipation performance. As a result, the difference in heat dissipation performance between the center and the ends of the battery cell can significantly reduce temperature deviation.

[0066] The heat dissipation member 130 having the above-described configuration can significantly improve the heat dissipation performance of the plurality of battery cells 110 accommodated in the battery case 120 , and in particular, can reduce temperature deviation of the plurality of battery cells, thereby improving the performance of the battery cells.

[0067] In the heat dissipation member 130, the cover plate 131 includes: a first accommodating groove 131a, which is arranged in the center of one surface of the cover plate and has a structure connected in the longitudinal direction of the battery cell 110; and a second accommodating groove 131b, which is respectively arranged at both sides of the first accommodating groove 131a in the thickness direction of the battery cell 110, and has a structure such that the spacing between the second accommodating grooves 131b gradually narrows from the center of the battery cell 110 toward both ends.

[0068] Here, the first heat transfer material 132a is disposed in the first receiving groove 131a, and the second heat transfer material 132b is disposed in the second receiving groove 131b.

[0069] When Figure 3 The first and second receiving grooves 131 a and 131 b have a structure formed in a concave shape on the top surface of the cover plate 131 when viewed from above.

[0070] Furthermore, the first heat transfer material 132a and the second heat transfer material 132b are made of the same material.

[0071] The heat dissipation member 130 having the above-described configuration forms the first and second receiving grooves 131 a and 131 b in one surface of the cover plate 131 to easily form the first and second heat transfer materials 132 a and 132 b.

[0072] The first and second accommodating recesses 131a and 131b are formed to be connected to each other. Thus, the first and second heat transfer materials 132a and 132b disposed in the first and second accommodating recesses 131a and 131b can be integrally connected to each other. As a result, heat generated in the battery cell 110 can be dissipated throughout the first and second heat transfer materials 132a and 132b, thereby improving heat dissipation performance.

[0073] An insulating member 133 having insulating properties is provided on one surface of the cap plate 131 at locations other than the first and second receiving recesses 131a and 131b. That is, the insulating member 133 insulates the battery cells 110 and the cap plate 131 from each other to prevent a short circuit that may occur when the battery cells 110 and the cap plate 131 come into contact with each other.

[0074] The insulating member 133 has an adhesive tape shape and is attached to one surface of the cap plate 131. Therefore, convenience in use can be improved.

[0075] In particular, a coating is further provided between the end of the insulating member 133 and the cover plate 131 to prevent heat transfer material from being introduced between the end of the insulating member 133 and the cover plate. In particular, the coating can prevent the end of the insulating member 133 from separating from the cover plate 131.

[0076] The battery module 100 according to the first embodiment of the present invention further includes a heat dissipation pad 140 .

[0077] cooling pad

[0078] The heat dissipation pad 140 is configured to reduce a temperature deviation between both ends and an upper center portion of the battery cell.

[0079] That is, since the electrode leads are connected, the temperature of heat generated at both ends of the battery cell is higher than the temperature of heat generated at the center of the battery cell, and thus, the heat dissipation pad 140 may be further configured to reduce the temperature deviation between the center and both ends of the top surface of the battery cell.

[0080] The heat dissipation pads 140 are attached to both sides of the inner surface of the battery case 120, respectively, and support both ends of the top surface of the battery cell 110 housed in the battery case 120 so as to release heat through both ends of the top surface of the battery cell 110. Thus, by improving the heat dissipation performance at both ends of the battery cell, the temperature deviation between the center and both ends of the battery cell can be significantly reduced.

[0081] A finishing pad 150 may be further provided to constantly maintain a spacing between the heat dissipation pads 140 respectively attached to both sides of the inner surface of the battery case 120 .

[0082] Dressing pad

[0083] The trimming pad 150 is attached to the inner surface of the battery case 120 between the pair of heat dissipation pads 140 to constantly maintain the spacing between the pair of heat dissipation pads 140. In particular, the trimming pad 150 can trim the space between the pair of heat dissipation pads 140 to prevent the battery cells 110 from being deformed due to being inserted into the space between the pair of heat dissipation pads 140.

[0084] Hereinafter, a method for manufacturing a battery module according to a first embodiment of the present invention will be described.

[0085] [Method for Manufacturing the Battery Module According to the First Embodiment of the Present Invention]

[0086] like Figures 9 to 13As shown in , the method for manufacturing the battery module according to the first embodiment of the present invention includes an arranging step, an accommodating step, a preparing step, and a coupling step.

[0087] Layout steps

[0088] In the arranging step, a plurality of battery cells 110 are prepared, the plurality of prepared battery cells 110 are arranged to overlap each other in a thickness direction, and the plurality of battery cells 110 arranged to overlap each other are connected to each other in series or in parallel to contact each other.

[0089] Accommodation Steps

[0090] In the receiving step, a plurality of battery cells 110 overlapped with each other are received in a battery case 120 having an open lower portion. Here, each battery cell 110 is received with a battery lead facing an end portion in the longitudinal direction of the battery case 120 and standing upright.

[0091] The accommodating step further includes attaching heat dissipation pads 140 to both ends of the inner surface of the battery case 120 corresponding to both ends of the top surface of the battery cell 110 , respectively, and the heat dissipation pads 140 improve heat dissipation performance at both ends of the top surface of the battery cell 110 .

[0092] In addition, the accommodating step further includes attaching a trimming pad 150 to the inner surface of the battery case 120 between the heat dissipation pads 140 , and the trimming pad 150 constantly maintains the interval between the pair of heat dissipation pads 140 to trim the space between the pair of heat dissipation pads 140 .

[0093] Preparation steps

[0094] The preparation steps include: a preparation process of preparing the cover plate 131 ; a forming process of forming a receiving groove for arranging a heat sink in the cover plate 131 ; and an injection process of manufacturing the heat sink 132 by forming the receiving groove in the cover plate 131 .

[0095] refer to Figure 10 In the preparation process, a cover plate 131 having a size and shape corresponding to the open lower portion of the battery case 120 is prepared.

[0096] refer to Figure 11 In the forming process, a first accommodating groove 131a and a second accommodating groove 131b are formed, and the first accommodating groove 131a and the second accommodating groove 131b are both formed by squeezing one surface of the cover plate 131 using a press (when Figure 11The top surface of the cover plate when viewed in the middle) is formed into a concave shape.

[0097] Here, the first accommodating groove 131a is formed to be connected to the center of one surface of the cover plate 131 in the longitudinal direction of the battery cell, and the second accommodating groove 131b is provided in two parts of the first accommodating groove 131a and has a structure arranged in multiple columns in the longitudinal direction of the battery cell 110.

[0098] Specifically, the second receiving grooves 131b are formed in one surface of the cover plate 131 such that the spacing between the second receiving grooves 131b gradually narrows from the center toward both ends of the battery cell 110. Thus, the second heat transfer material 132b disposed in the second receiving grooves 131b can be manufactured to have a structure in which the spacing between the second heat transfer materials 132b gradually narrows from the center toward both ends of the battery cell 110.

[0099] A heat dissipation member 130 is prepared. The heat dissipation member 130 includes a heat dissipation body 132 disposed on one surface of the cap plate 131 supporting the battery cells 110 .

[0100] During the formation process, the first and second receiving grooves 131a, 131b are formed to be connected to each other. Therefore, even if a heat transfer solution is injected into either the first or second receiving groove 131a, 131b, the heat transfer solution can be injected into the other receiving groove, thereby improving operational efficiency. In particular, since the first and second heat transfer materials 132a, 132b formed in the first and second receiving grooves 131a, 131b are integrally connected to each other, heat dissipation performance is improved.

[0101] An attaching process is performed between the forming process and the injection process: an insulating member having insulation properties is attached to one surface of the cap plate 131 except for the first and second accommodating recesses 131 a and 131 b .

[0102] refer to Figure 12 In the attachment process, the insulating member 133 having adhesive force is attached to one surface of the cap plate 131. Here, in order to prevent the end of the insulating member 133 from being separated, a coating solution is applied between the end of the insulating member 133 and the cap plate 131 to prepare a coating layer.

[0103] refer to Figure 13During the injection process, a heat transfer solution 132c is injected into the first and second receiving grooves 131a, 131b to produce the heat sink 132 including the first and second heat transfer materials 132a, 132b. Specifically, as the heat transfer solution 132c is applied to the first receiving groove 131a and solidified, the first heat transfer material 132a is produced, and as the heat transfer solution 132c is applied to the second receiving groove 131b and solidified, the second heat transfer material 132b is produced. Here, since the first and second receiving grooves 131a, 131b are connected to each other, the first and second heat transfer materials 132a, 132b are produced so as to be integrally connected to each other.

[0104] Therefore, when the method for manufacturing the battery module according to the first embodiment of the present invention is completed, a battery module can be manufactured. Figure 2 The finished battery module 100 is shown in FIG.

[0105] Hereinafter, in the description of other embodiments of the present invention, parts having the same functions as those of the above-described embodiments are given the same reference numerals in the drawings, and thus repeated descriptions will be omitted.

[0106] [Battery Module According to Second Embodiment of the Invention]

[0107] like Figure 14 As shown in , the battery module 100 according to the second embodiment of the present invention includes: a first accommodating groove 131a, which is arranged in the center of one surface of the battery module and has a structure connected in the longitudinal direction of the battery cell 110; and a second accommodating groove 131b, which is arranged on both sides of the first accommodating groove 131a in the thickness direction of the battery cell 110, and has a structure such that the spacing between the second accommodating grooves 131b gradually narrows from the center of the battery cell 110 toward both ends.

[0108] Here, the first accommodating groove 131a is set to have a depth gradually increasing from the center of the battery cell 110 to both ends. Therefore, the first heat transfer material 132a set in the first accommodating groove 131a has such a structure: the height of the first heat transfer material 132a gradually increases from the center of the battery cell 110 to both ends.

[0109] Therefore, in the battery module 100 according to the second embodiment of the present invention, heat dissipation performance may be differently applied from the middle to both ends of the battery cell 110 disposed in the center, and thus, temperature deviation of the battery cell disposed at the center of the battery case may be reduced.

[0110] [Battery module according to the third embodiment of the present invention]

[0111] like Figure 15 As shown in , the battery module 100 according to the third embodiment of the present invention includes: a first accommodating groove 131a, which is arranged in the center of one surface of the battery module and has a structure connected in the longitudinal direction of the battery cell 110; and a second accommodating groove 131b, which is arranged on both sides of the first accommodating groove 131a in the thickness direction of the battery cell 110, and has a structure such that the spacing between the second accommodating grooves 131b gradually narrows from the center of the battery cell 110 toward both ends.

[0112] Here, the second accommodating groove 131b is set to have a depth gradually increasing from the center of the battery cell 110 to both ends. Therefore, the second heat transfer material 132b set in the second accommodating groove 131b has such a structure: the height of the second heat transfer material 132b gradually increases from the center of the battery cell 110 to both ends.

[0113] Therefore, in the battery module 100 according to the third embodiment of the present invention, the heat dissipation performance can be more accurately adjusted from the middle to the two ends of the battery cell 110 arranged at each of the two ends of the battery shell, thereby reducing the temperature deviation of the battery cell arranged at each of the two ends of the battery shell.

[0114] Therefore, the scope of the present invention is defined by the appended claims rather than by the foregoing description and the exemplary embodiments described therein. Various modifications within the meaning equivalent to the claims of the present invention and within the claims should be considered to be within the scope of the present invention.

[0115] Description of Reference Numerals

[0116] 100: Battery module

[0117] 110: Battery cell

[0118] 120: Battery housing

[0119] 130: Heat dissipation components

[0120] 131: Cover

[0121] 131a: First receiving groove

[0122] 131b: Second receiving groove

[0123] 132: Heat sink

[0124] 132a: First heat transfer material

[0125] 132b: Second heat transfer material

[0126] 133: Insulating components

[0127] 140: Cooling pad

[0128] 150: Trimming pad

Claims

1. A battery module comprising: a plurality of battery cells arranged to be stacked on one another in a thickness direction thereof; a battery case configured to accommodate the battery cell and having an open lower portion; as well as a heat dissipation member including a cover plate and a heat dissipation body, wherein the cover plate is coupled to a lower portion of the battery housing to support the battery cell, and the heat dissipation body is provided on one surface of the cover plate supporting the battery cell to dissipate heat generated in the battery cell. Wherein, the heat sink comprises: a first heat transfer material provided to be connected to a center of one surface of the cap plate in a longitudinal direction of the battery cell; and a second heat transfer material provided on two portions in a width direction of the first heat transfer material and having a structure arranged in a plurality of columns in the longitudinal direction of the battery cells, The second heat transfer materials are arranged such that the intervals between the second heat transfer materials gradually narrow from the center toward both ends of the battery cell to gradually improve heat dissipation performance from the center toward the both ends of the battery cell, and The first heat transfer material and the second heat transfer material are integrally connected to each other.

2. The battery module according to claim 1, wherein: The cover plate comprises: a first accommodating groove provided in a center of one surface of the cap plate and having a structure connected in the longitudinal direction of the battery cells; and second accommodating grooves, the second accommodating grooves being provided on both sides of the first accommodating groove in the thickness direction of the battery cell, and having a structure in which a spacing between the second accommodating grooves gradually narrows from the center toward the two ends of the battery cell, and The first heat transfer material is disposed in the first accommodation groove, and the second heat transfer material is disposed in the second accommodation groove.

3. The battery module according to claim 2, wherein: The first accommodating groove and the second accommodating groove are formed to be connected to each other.

4. The battery module according to claim 2, wherein: An insulating member having insulation properties is provided on one surface of the cap plate except for the first and second accommodating grooves.

5. The battery module according to claim 1, wherein: A pair of heat dissipation pads are respectively provided on both ends of the inner surface of the battery case, and the pair of heat dissipation pads reduce a temperature deviation between a center and both ends of the battery cell by releasing heat generated at the both ends of the battery cell.

6. The battery module according to claim 5, wherein: A trimming pad is provided on the inner surface of the battery case between the pair of heat dissipation pads, and the trimming pad trims the space between the pair of heat dissipation pads.

7. The battery module according to claim 2, wherein: The first receiving groove is configured to have a depth gradually increasing from the center toward the two ends of the battery cell, and The first heat transfer material disposed in the first receiving groove is disposed to have a thickness gradually increasing from the center toward both ends of the battery cell.

8. The battery module according to claim 2, wherein: The depth gradually increases from the second receiving groove disposed at the center of the battery cell toward the second receiving groove disposed at each of the two ends of the battery cell, and Each of the second heat transfer materials disposed in the second receiving groove is disposed to have a thickness gradually increasing from the center toward both ends of the battery cell.

9. A method for manufacturing a battery module, the method comprising: Arranging the plurality of battery cells so as to overlap each other in a thickness direction; Accommodating step: accommodating the plurality of overlapping battery cells in a battery case, wherein the lower portion of the battery case is open; Preparation step: preparing a heat dissipation component, the heat dissipation component including a cover plate and a heat dissipation body, the heat dissipation body being provided on one surface of the cover plate supporting the battery cell; as well as a coupling step of coupling the cover plate of the heat dissipation member to the lower portion of the battery housing and supporting the heat dissipation body on the battery cell; Wherein, the preparation steps include: Preparation process: preparing the cover plate; Forming process: extruding one surface of the cover plate to form a first receiving groove and a second receiving groove; and injection process: injecting a heat transfer solution into the first accommodating groove and the second accommodating groove to manufacture the heat sink, wherein the heat sink includes a first heat transfer material formed in the first accommodating groove and a second heat transfer material formed in the second accommodating groove, In the forming process, the first accommodating groove is formed to be connected to the center of one surface of the cap plate in the longitudinal direction of the battery cell, and the second accommodating groove is provided in each of two portions in the width direction of the first accommodating groove and is formed to have a structure in which the battery cells are arranged in a plurality of columns in the longitudinal direction. The second accommodating grooves are formed such that the spacing between the second accommodating grooves gradually narrows from the center toward both ends of the battery cell on one surface of the cover plate, and the second heat transfer material disposed in the second accommodating grooves has a structure such that the spacing between the second heat transfer materials gradually narrows from the center toward the both ends of the battery cell, and The first heat transfer material and the second heat transfer material are integrally connected to each other.

10. The method according to claim 9, wherein: In the forming process, the first accommodating groove and the second accommodating groove are formed to be connected to each other, and During the injection process, the first accommodating groove and the second accommodating groove are connected to each other. 11 . The method according to claim 9 , further comprising, between the forming process and the injecting process, an attaching process of attaching an insulating member having insulation properties to one surface of the cap plate except for the first and second accommodating recesses.

12. The method according to claim 9, wherein The accommodating step further includes a process of attaching heat dissipation pads each having heat dissipation performance to both ends of the inner surface of the battery case corresponding to the both ends of the battery cell, respectively.

13. The method according to claim 12, wherein: The receiving step further includes a process of attaching a finishing pad to the inner surface of the battery case between the heat dissipation pads.

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