Battery module, battery pack, and energy storage system

Abstract

A battery module according to an embodiment of the present invention comprises: a battery cell stack in which a plurality of battery cells are stacked in one direction; and a temperature sensing unit disposed in the battery cell stack, in which the temperature sensing unit includes: a thermally conductive member at least partially in contact with the battery cell; and a temperature sensor coupled to the thermally conductive member to measure a temperature of the battery cell.

Description

Technical Field

[0001] Cross-reference to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2023-0120508, filed with the Korean Intellectual Property Office on September 11, 2023, and Korean Patent Application No. 10-2024-0121685, filed with the Korean Intellectual Property Office on September 6, 2024, the disclosures of which are incorporated herein by reference in their entirety.

[0003] This disclosure relates to battery modules, battery packs, and energy storage systems, and more specifically, to battery modules, battery packs, and energy storage systems capable of accurately measuring the temperature of battery cells. Background Technology

[0004] The use of mobile devices such as cellular phones, laptops, portable camcorders, and digital cameras, as well as energy storage systems (ESS), has become commonplace in modern society, accelerating technological development in mobile device-related fields. Furthermore, as a measure to address air pollution caused by existing gasoline vehicles using fossil fuels, rechargeable batteries are being used as a power source for electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (P-HEVs). Therefore, the need for developing rechargeable batteries is increasing.

[0005] Currently, commercially available batteries include nickel-cadmium (NiCd), nickel-metal hydride (NiMH), nickel-zinc (NiZn), and lithium-ion (LiN) batteries. Among these, lithium-ion batteries are the most popular because they are not affected by the memory effect and therefore, compared to nickel-based batteries, they are freely rechargeable, have a low self-discharge rate, and high energy density.

[0006] Figure 1 This diagram illustrates a temperature sensor 1 installed in a conventional battery module or battery pack. In a conventional battery module or battery pack, a battery cell stack 2 is housed in a housing 3, and the temperature sensor 1 is disposed on one surface (e.g., the upper surface) of the battery cell stack 2 to detect the temperature of the battery cells.

[0007] When temperature sensor 1 is placed on one surface of battery cell stack 2, the distance between temperature sensor 1 and the battery cells in battery cell stack 2 is large. Therefore, the temperature of the battery cell measured by temperature sensor 1 is slightly different from the actual temperature of the battery cell.

[0008] Furthermore, to accurately measure the temperature of the battery cell, it is preferable to measure the temperature of the battery cell body. However, during repeated charge-discharge processes or the initial charging process, the battery cell may experience expansion due to the decomposition of the internal electrolyte and the generation of gas, a phenomenon known as expansion or breathing. In battery modules comprising a large number of battery cells, when expansion occurs within the battery cells, the cells expand in their thickness direction, making it difficult to position a temperature sensor within the battery cell body.

[0009] Therefore, considering phenomena such as battery cell expansion, it is necessary to develop a method that allows temperature sensors to accurately measure the temperature of battery cells. Summary of the Invention

[0010] Technical issues

[0011] The purpose of this disclosure is to provide a battery module, battery pack, and energy storage system capable of accurately measuring the temperature of battery cells.

[0012] However, the technical objectives to be addressed by the embodiments of this disclosure are not limited to those disclosed above, and can be extended in various ways within the scope of the technical concepts included in this disclosure.

[0013] Technical solution

[0014] According to an embodiment of the present disclosure, a battery module is provided, the battery module comprising: a battery cell stack in which a plurality of battery cells are stacked along one direction; and a temperature sensing unit disposed in the battery cell stack, wherein the temperature sensing unit comprises: a thermally conductive member configured to at least partially contact the battery cells; and a temperature sensor coupled to the thermally conductive member to measure the temperature of the battery cells.

[0015] The heat-conducting component may include a contact portion and a mounting portion, the contact portion being in contact with the cell body of the battery cell, and a temperature sensor being disposed on the mounting portion.

[0016] The mounting section can be folded and extended from one end of the contact section and positioned outside the battery cell stack.

[0017] The contact portion may include a first portion and a second portion, the first portion being in contact with the cell body, and the second portion extending from the first portion to protrude to the outside of the battery cell.

[0018] The heat-conducting component also includes an extension that is connected to the first part and in contact with the cell body, and the area of ​​the extension is larger than that of the first part.

[0019] The area of ​​the extension section can be 0.1 to 1 times the area of ​​the main body of the cell.

[0020] The heat-conducting component may further include: an extension that extends from the first portion in a direction toward the lower part of the battery cell; and a hook that folds from the end of the extension toward a direction in which the plurality of battery cells are stacked.

[0021] The contact portion is arranged parallel to the large area of ​​the battery cell, and the mounting portion extends in one direction so as to be orthogonal to the contact portion.

[0022] The contact portion includes a pair of contact portions arranged to face each other, and the mounting portion may be disposed between the pair of contact portions to connect the contact portions.

[0023] The contact portion can be formed in the shape of a thin film or a line.

[0024] The battery module may also include a reinforcing member that supports at least a portion of the temperature sensing unit.

[0025] The heat-conducting component can be located at at least one position among the multiple battery cells, between the two battery cells closest to the center of the battery cell stack and between the two outermost battery cells.

[0026] The battery module also includes a compression pad positioned between two adjacent battery cells and at least one location on the outside of the outermost battery cell, wherein a heat-conducting component may be disposed on the compression pad.

[0027] The compression pad may include a receiving groove in which at least a portion of the thermally conductive component is received.

[0028] The heat-conducting component includes a contact portion and a mounting portion. The contact portion contacts the cell body of the battery cell, and a temperature sensor is disposed on the mounting portion. At least a portion of the contact portion is accommodated in a receiving groove, and the mounting portion can be folded and extended from one end of the contact portion and is positioned outside the battery cell stack.

[0029] At least a portion of the heat-conducting component can be accommodated in a receiving groove in a manner that is integrally planarized with the large area of ​​the compression pad.

[0030] The thermally conductive component may also include a thermally insulating component that covers the portion of the thermally conductive component that is not in contact with the cell body.

[0031] The thermal insulation component includes a sensor housing in which a portion of the thermally conductive component is exposed to the outside, and a temperature sensor can be disposed within the sensor housing.

[0032] A battery pack may be provided, which includes a battery module according to an embodiment.

[0033] An energy storage system may be provided, which includes a battery pack according to an embodiment.

[0034] Beneficial effects

[0035] According to embodiments of this disclosure, battery modules, battery packs, and energy storage systems can measure the surface temperature of battery cells, enabling accurate measurement of battery cell temperature. Furthermore, deformation of the battery cells caused by heat-conducting members disposed between adjacent battery cells can be minimized.

[0036] The effects of this disclosure are not limited to those described above, and other effects not described herein will be clearly understood by those skilled in the art from the appended claims. Attached Figure Description

[0037] Figure 1 A temperature sensor based on existing technology is shown.

[0038] Figure 2 This is a perspective view of a battery cell stack according to an embodiment of the present disclosure.

[0039] Figure 3 This is a perspective view showing the structure of a temperature sensing unit disposed in a battery cell stack according to an embodiment of the present disclosure.

[0040] Figure 4 yes Figure 3 An exploded 3D diagram.

[0041] Figure 5 This is a perspective view of a temperature sensing unit according to an embodiment of the present disclosure.

[0042] Figure 6 This is a perspective view showing a modified example of a temperature sensing unit according to an embodiment of the present disclosure.

[0043] Figure 7 This is a perspective view illustrating another modified example of a temperature sensing unit according to an embodiment of the present disclosure.

[0044] Figure 8 This is a perspective view showing yet another modified example of a temperature sensing unit according to an embodiment of the present disclosure.

[0045] Figure 9 This is a perspective view showing yet another modified example of a temperature sensing unit according to an embodiment of the present disclosure.

[0046] Figure 10This is a perspective view showing an example of a reinforcing member for supporting a temperature sensing unit according to an embodiment of the present disclosure.

[0047] Figure 11 This is a perspective view showing an example of a battery cell stack housed in a housing according to one embodiment of the present disclosure.

[0048] Figure 12 yes Figure 11 An exploded 3D diagram.

[0049] Figure 13 This is a cross-sectional view of a battery module according to another embodiment of the present disclosure.

[0050] Figure 14 This is a perspective view showing the structure of a temperature sensing unit disposed in a battery cell stack according to another embodiment of the present disclosure.

[0051] Figure 15 yes Figure 14 An exploded 3D diagram.

[0052] Figure 16 It is used for explanation Figure 14 An exploded perspective view of the compression pad and heat-conducting components shown. Detailed Implementation

[0053] Various embodiments of this disclosure will be described in detail below with reference to the accompanying drawings, to the extent that those skilled in the art can readily practice this disclosure. This disclosure can be implemented in various different forms and is not limited to the embodiments described herein.

[0054] For clarity in describing this disclosure, descriptions of parts unrelated to this disclosure will be omitted, and the same or similar components will be indicated by the same reference numerals throughout the description.

[0055] Because the accompanying drawings arbitrarily show the dimensions and thicknesses of each component for ease of description, this disclosure is not limited to the dimensions and thicknesses shown. The drawings depict thicknesses at an enlarged scale to clearly show different layers and regions. Furthermore, the drawings exaggerate the thickness of specific layers or regions for ease of description.

[0056] When layers, films, regions, plates, etc., are arranged "on" a particular component, this description includes not only cases where the layers, films, regions, plates, etc., are arranged "directly" on the particular component, but also cases where the layers, films, regions, plates, etc., are arranged on the particular component via another part. When a component is arranged "directly" on another component, this indicates that there is no new assembly between the two components. Furthermore, when an assembly is arranged "on" a reference component, this indicates that the assembly exists above or below the reference component, and does not necessarily indicate that the assembly is arranged only on the upper part of the reference component opposite to the direction of gravity.

[0057] Throughout this description, when a component “includes” an element, unless otherwise defined, this does not indicate that the component excludes other components, but rather that the component may include other components.

[0058] Throughout this description, the term "in a plan view" refers to an object viewed from above, and the term "in a cross-sectional view" refers to a vertical cross-section of an object viewed from the side.

[0059] Figure 2 This is a perspective view of a battery cell stack according to an embodiment of the present disclosure. Figure 3 This is a perspective view showing the structure of a temperature sensing unit disposed in a battery cell stack according to an embodiment of the present disclosure. Figure 4 yes Figure 3 An exploded 3D diagram. Figure 5 This is a perspective view of a temperature sensing unit according to an embodiment of the present disclosure.

[0060] Reference Figures 2 to 5 The battery module 10 according to this embodiment includes: a battery cell stack 110 in which a plurality of battery cells 100 are stacked; and a temperature sensing unit 120 disposed in the battery cell stack 110. Furthermore, a detailed description of the temperature sensing unit 120 will be given below.

[0061] First, the battery cell 100 according to an embodiment of the present disclosure can be a pouch-type battery, wherein an electrode assembly having electrode leads 101 protruding in one or two directions is housed in a pouch housing 104. However, this is only an example, and the battery cell according to another embodiment of the present disclosure can be a prismatic battery. For ease of explanation, the battery cell 100 as a pouch-type battery will be described primarily below.

[0062] The battery cell 100 can have a rectangular sheet shape. The battery cell 100 can be formed by housing an electrode assembly within a pouch shell 104 made of a laminate comprising resin and metal layers, and then attaching the outer periphery of the pouch shell 104. As an example, the battery cell 100 can have a structure where two electrode leads 101 face each other and protrude from both ends of the cell body 103. As another example, it is also possible for all electrode leads 101 of the battery cell 100 to protrude in one direction. One of the electrode leads 101 is a positive electrode lead, and the other is a negative electrode lead.

[0063] The battery cell 100 can be manufactured by incorporating a peripheral portion of the pouch housing 104 while the electrode assembly (not shown) is housed within the pouch housing 104. As another example, the battery cell 100 is configured such that the electrode assembly can be housed and the remaining side can be sealed while one side of the pouch housing 104 is folded.

[0064] The bag housing 104, made of laminated sheet, may include an inner resin layer for sealing, a metal layer for preventing material penetration, and an outermost resin layer. Based on the electrode assembly inside the bag housing 104, the inner resin layer may be located at the innermost side, the outer resin layer at the outermost side, and the metal layer may be located between the inner and outer resin layers.

[0065] The outer resin layer possesses excellent tensile strength and weather resistance relative to its thickness, and may have electrical insulating properties to protect the electrode assembly from external influences. This outer resin layer may comprise polyethylene terephthalate (PET) resin or nylon resin. A metal layer prevents air, moisture, etc., from flowing into the pouch cell. This metal layer may comprise aluminum (Al). The inner resin layers can be heat-sealed together by heat and / or pressure applied while the electrode assembly is embedded. This inner resin layer may comprise cast polypropylene (CPP) or polypropylene (PP).

[0066] The bag housing 104 is divided into two parts, and a concave housing portion can be formed in at least one of the two parts, in which the electrode assembly can be disposed. Along the outer periphery of such housing portion, the inner resin layers of the two parts of the bag housing 104 can be joined together, thereby sealing the bag housing 104 and enabling the manufacture of a battery cell 100 as a bag-type secondary battery.

[0067] Multiple battery cells 100 can be configured, and multiple battery cells 100 can be stacked to be electrically connected to each other, thereby forming a battery cell stack 110. Specifically, as... Figure 3 As shown, multiple battery cells 100 can be stacked upright along a direction d1 parallel to the y-axis, such that one side surface of each cell body 103 faces each other. Consequently, electrode leads 101 can protrude in a direction perpendicular to the stacking direction of the battery cells 100. That is, in a battery cell 100, one electrode lead 101 can protrude towards the x-axis direction, and another electrode lead 101 can protrude towards the -x-axis direction. In the case of a battery cell where the electrode lead 101 protrudes in only one direction, the electrode lead 101 protrudes in either the x-axis direction or the -x-axis direction.

[0068] The temperature sensing unit 120 includes: a thermally conductive member 121 configured to at least partially contact the battery cell 100; and a temperature sensor 124 coupled to the thermally conductive member 121 to measure the temperature of the battery cell 100.

[0069] The heat-conducting member 121 can be formed of a material with high thermal conductivity, allowing heat generated from the battery cell 100 to be rapidly conducted to the temperature sensor 124. The heat-conducting member 121 can be formed of various thermally conductive materials, and this disclosure is not limited or constrained by the material and properties of the heat-conducting member 121. For example, the heat-conducting member 121 can be formed of a metallic material with high thermal conductivity. Alternatively, the heat-conducting member 121 can be provided in the form of a thin film of thermally conductive resin.

[0070] The heat-conducting component 121 may include: a contact portion 122 that contacts the cell body 103 of the battery cell 100; and a mounting portion 123 on which a temperature sensor 124 is disposed.

[0071] The contact portion 122 is at least partially in contact with the cell body 103 of the battery cell 100. Heat generated in the battery cell 100 can be transferred to the temperature sensor 124 through the contact portion 122. To increase the contact area between the contact portion 122 and the battery cell 100, the contact portion 122 can be arranged parallel to a large area of ​​the battery cell 100 and can be integrally formed into a flat thin film shape. Furthermore, even when the contact portion 122 is arranged between the battery cells 100, its thin film shape minimizes the pressure and / or deformation exerted by the contact portion 122 on the battery cell 100. Therefore, even if expansion occurs on the battery module 10, damage to the battery cell 100 by the contact portion 122 can be prevented.

[0072] The contact portion 122 may include a first portion 122a that contacts the cell body 103 and a second portion 122b that extends from the first portion 122a and protrudes to the outside of the battery cell 100. That is, the second portion 122b refers to the portion 122b that does not contact the battery cell 100. Although not in... Figures 3 to 5 As shown in the figure, however, the temperature sensor 124 may be disposed in the second part 122b of the contact portion 122.

[0073] In addition, the above reference Figures 3 to 5 The contact portion 122 has been described as having the shape of a thin film, but is not limited thereto. For example, the contact portion 122 may be formed in a line shape, and the line-shaped contact portion 122 may contact the cell body 103 of the battery cell 100. In order to increase the contact area between the contact portion 122 and the battery cell 100, the contact portion 122 may be formed in the shape of multiple lines.

[0074] The mounting portion 123 can be folded and extended from one end of the contact portion 122 and is located outside the battery cell stack 110. For example, the mounting portion 123 can be folded and extended from a second portion 122b, which is the portion of the contact portion 122 that does not contact the battery cell 100. For example, the mounting portion 123 can extend along a direction d1 in which the battery cells 100 are stacked so as to be orthogonal to the contact portion 122. For this purpose, the temperature sensor 124 can be easily mounted on the mounting portion 123. In addition, since the mounting portion 123 can be supported by a portion of the battery cell 100, the temperature sensor 124 can be stably held after being attached to the mounting portion 123.

[0075] An adhesive (not shown) for securing the mounting portion 123 to the battery cell 100 can be applied to the empty space between the mounting portion 123 and the battery cell 100. After applying the adhesive to the outer surface of the battery cell 100, the mounting portion 123 is provided so that it can be secured to the battery cell 100. Therefore, even in the event of an external impact, the mounting portion 123 is secured to the battery cell 100, thereby reducing the impact on the temperature sensor 124 secured to the mounting portion 123.

[0076] The temperature sensor 124 can be configured, for example, as a thermistor, which can calculate the temperature based on the received heat through its resistance value, etc. Of course, different types of temperature sensors can also be used.

[0077] Temperature information detected by temperature sensor 124 is sent to the battery management system (BMS) in the form of an electrical signal. Therefore, the BMS processor can pre-control the charging and discharging of the battery cells to prevent thermal runaway of the battery cells when overheating is detected.

[0078] Figure 6 This is a perspective view showing a modified example of a temperature sensing unit according to an embodiment of the present disclosure.

[0079] Reference Figure 6 The heat-conducting member 121 may include: a pair of contact portions 122 that contact the cell body 103 of the battery cell 100; and a mounting portion 123 on which a temperature sensor 124 is disposed. The pair of contact portions 122 may be arranged facing each other, and the mounting portion 123 may be disposed between the pair of contact portions 122 to connect them. For example, the heat-conducting member 121 may be formed as… "shape.

[0080] like Figure 6As shown, the mounting portion 123 is supported by a pair of contact portions 122 facing each other, which increases the structural stability when the temperature sensing unit 120 is mounted on the battery cell stack 110. In addition, the increased contact area between the heat-conducting member 121 and the cell body 103 of the battery cell 100 improves the accuracy of temperature measurement of the battery cell 100.

[0081] Figure 7 This is a perspective view illustrating another modified example of a temperature sensing unit according to an embodiment of the present disclosure.

[0082] Reference Figure 7 The heat-conducting component 121 may also include an extension 125 that is connected to the first portion 122a of the contact portion 122 and contacts the battery cell body 103.

[0083] The extension portion 125 is used to increase the contact area between the heat-conducting member 121 and the cell body 103 of the battery cell 100. Since the contact area between the heat-conducting member 121 and the cell body 103 is increased by the extension portion 125, the accuracy of temperature measurement of the battery cell 100 can be improved.

[0084] Furthermore, since the contact area between the heat-conducting member 121 and the cell body 103 is increased by the area of ​​the extension portion 125, the frictional force between the heat-conducting member 121 and the battery cell 100 can be increased. Therefore, when the temperature sensing unit 120 is disposed on the battery cell stack 110, structural stability can be increased. For example, even if the battery module 10 is subjected to an external impact, the frictional force between the heat-conducting member 121 and the battery cell 100 will increase, thereby preventing the temperature sensing unit 120 from detaching from the battery cell stack 110.

[0085] In this case, the area of ​​the extension portion 125 can be wider than the area of ​​the first portion 122a. For example, the area of ​​the extension portion 125 can be almost the same as the area of ​​the cell body 103. In this case, since the contact area between the heat-conducting member 121 and the cell body 103 is maximized, the accuracy of temperature measurement of the battery cell 100 is increased, and the friction between the heat-conducting member 121 and the battery cell 100 can be maximized.

[0086] As another example, the area of ​​the extension portion 125 can be 0.1 to 1 times the area of ​​the cell body 103. Preferably, the area of ​​the extension portion 125 can be 0.2 to 0.5 times the area of ​​the cell body 103. Since the contact area between the heat-conducting member 121 and the cell body 103 increases within the above-mentioned area range, the extension portion 125 can be tightly attached between adjacent battery cells 100 due to the pressure and friction caused by the battery cells 100 during the assembly of the battery cell stack 110. Therefore, the accuracy of temperature measurement of the battery cells 100 can be improved, and the temperature sensing unit 120 can be prevented from detaching from the battery cell stack 110 by the friction between the heat-conducting member 121 and the battery cells 100.

[0087] Figure 8 This is a perspective view showing yet another modified example of a temperature sensing unit according to an embodiment of the present disclosure.

[0088] Reference Figure 8 The heat-conducting member 121 may further include: an extension 126 that extends from the first portion 122a in a direction toward the lower portion of the battery cell 100; and a hook 127 that folds from the end of the extension 126 toward a direction d1 in which the plurality of battery cells 100 are stacked.

[0089] The extension 126 can extend toward the lower part of the cell body 103 along the -z axis direction.

[0090] At this time, the sum of the vertical length h1 of the contact portion 122 of the heat-conducting member 121 and the vertical length h2 of the extension portion 126 can be equal to or slightly longer than the vertical length of the battery cell 100. As a result, the extension portion 126 passes between two adjacent battery cells 100 in the vertical direction (z-axis direction), and the hook portion 127 is folded at the end of the extension portion 126, so that the hook portion 127 hooks onto the lower part of the battery cell stack 110. Therefore, the structural stability of the temperature sensing unit 120 is increased due to the hooking structure of the extension portion 126 and the hook portion 127. For example, even when the battery module 10 is subjected to an external impact, the hook portion 127 of the heat-conducting member 121 hooks onto the lower part of the battery cell stack 110, thereby preventing the temperature sensing unit 120 from detaching from the battery cell stack 110.

[0091] Furthermore, since the contact area between the heat-conducting member 121 and the battery cell 100 is increased even through the extension 126, the accuracy of temperature measurement of the battery cell 100 can be improved.

[0092] Figure 9 This is a perspective view showing yet another modified example of a temperature sensing unit according to an embodiment of the present disclosure.

[0093] Reference Figure 9 The battery module 10 may further include a heat insulation member 130 that covers at least a portion of the heat-conducting member 121. For example, the heat insulation member 130 may cover the portion of the heat-conducting member 121 that does not contact the cell body 103 of the battery cell 100. For example, the heat insulation member 130 may cover the second portion 122b of the contact portion 122 and the mounting portion 123. Since the heat insulation member 130 does not cover the first portion 122a of the contact portion 122 of the heat-conducting member 121, which is the portion that contacts the cell body 103 of the battery cell 100, the first portion 122a of the contact portion 122 can directly contact the cell body 103 of the battery cell 100. Therefore, the heat generated in the battery cell 100 can be transferred to the temperature sensor 124 through the first portion 122a of the contact portion 122.

[0094] Since the heat insulation member 130 covers the second portion 122b of the contact portion 122 and the mounting portion 123 of the heat-conducting member 121, heat transferred from the first portion 122a of the contact portion 122 toward the temperature sensor 124 can be prevented from being dissipated to the outside of the heat-conducting member 121. Furthermore, the heat insulation member 130 can also prevent the temperature sensor 124 from being affected by the external environment of the battery cell 100. Therefore, the temperature of the cell body 103 of the battery cell 100 can be measured more accurately by the temperature sensor 124.

[0095] The thermal insulation member 130 may be made of a material such as silica (e.g., glass fiber). However, the material of the thermal insulation member 130 is not limited to this, and any material with high thermal insulation properties may be included in this embodiment. As another example, the thermal insulation member 130 may be made of materials such as urethane series (including urethane foam), polyurethane series (including polyurethane foam), polystyrene (including expanded polystyrene or extruded polystyrene foam), polyethylene, cellulose, phenolic resin (including phenolic foam), etc.

[0096] The heat insulation member 130 includes a sensor receiving portion 131 in which a portion of the heat-conducting member 121 (e.g., a portion of the mounting portion 123) is exposed to the outside, and a temperature sensor 124 can be disposed within the sensor receiving portion 131. The sensor receiving portion 131 minimizes the area of ​​the heat-conducting member 121 surface exposed to the outside and can be shaped to correspond to the shape of the temperature sensor 124, allowing the temperature sensor 124 to be disposed. When housed in the sensor receiving portion 131, the temperature sensor 124 is fixed to the mounting portion 123 of the heat-conducting member 121, thereby preventing the temperature sensor 124 from detaching from the mounting portion 123 even if external forces such as external impacts are applied to the temperature sensor 124. Furthermore, since the external forces acting on the temperature sensor 124 are dispersed by the heat insulation member 130, malfunctions of the temperature sensor 124 can be reduced.

[0097] Figure 10 This is a perspective view showing an example of a reinforcing member for supporting a temperature sensing unit according to an embodiment of the present disclosure.

[0098] Reference Figure 10 The battery module 10 may include a reinforcing member 140 supporting at least a portion of the temperature sensing unit 120. The reinforcing member 140 may be held on the battery cell 100 while in contact with at least a portion of the temperature sensing unit 120. For example, as... Figure 10 As shown, the reinforcing member 140 can be " The reinforcing member 140 is a shaped component that can cover the temperature sensing unit 120 on the upper part of the battery cell 100. Specifically, the reinforcing member 140 may include a first surface 141 and a second surface 142. The first surface 141 is parallel to the upper surface (xy plane in the figure) of the battery cell stack 110, and the second surface 142 extends from both ends of the first surface 141 to be parallel to a large area of ​​the battery cell 100. Therefore, the first surface 141 of the reinforcing member 140 can support the mounting portion 123 of the temperature sensing unit 120, and the second surface 142 can support the contact portion 122 of the temperature sensing unit 120. However, the shape of the reinforcing member 140 is not limited to the shapes described above and can have various shapes. For example, the second surface 142 of the reinforcing member 140 may be a shape that extends from one end of the first surface 141. "Components of shape."

[0099] In addition, although not in Figure 10 As shown in the figure, a sensor receiving groove (not shown) capable of accommodating the temperature sensor 124 can be formed on the surface of the first surface 141 of the reinforcing member 140 facing the temperature sensing unit 120. Therefore, even when the reinforcing member 140 covers the temperature sensing unit 120, the temperature sensor 124 can be prevented from being pressed by the reinforcing member 140.

[0100] The reinforcing member 140 may be made of a material capable of elastic deformation so as to be held by the battery cell 100. The reinforcing member 140 may elastically press against the battery cell 100 when covering the temperature sensing unit 120, thereby supporting the temperature sensing unit 120. However, the method by which the reinforcing member 140 is held by the battery cell 100 is not limited to those described above. For example, the reinforcing member 140 may be fixed to the battery cell 100 by adhesive when covering the temperature sensing unit 120 without pressing against the battery cell 100.

[0101] In addition, the reinforcing member 140 is not limited to Figure 10 The form shown is not provided, but it can have various forms capable of supporting at least a portion of the temperature sensing unit 120. For example, the battery module 10 may include a bridge-shaped reinforcing member (not shown) extending from the busbar frame 200 toward at least one of the battery cells 100. The bridging member extending from the busbar frame 200 can support at least a portion of the temperature sensing unit 120. Specifically, the bridging member can extend from the busbar frame 200 and secure the upper surface (i.e., the mounting portion 123) of the temperature sensing unit 120. As another example, the bridging member can also secure the side surface (i.e., the contact portion 122) of the temperature sensing unit 120 while being spaced a predetermined distance from the mounting portion 123 of the temperature sensing unit 120.

[0102] The reinforcing member 140 can be made of a material that is rigid and can be elastically deformed as needed. For example, the reinforcing member 140 can be made of a plastic material. However, the material of the reinforcing member 140 is not limited to those mentioned above.

[0103] The reinforcing member 140 supports at least a portion of the temperature sensing unit 120, thus reinforcing the heat-conducting member 121 when its rigidity is insufficient. In addition, since the reinforcing member 140 can cover at least a portion of the temperature sensing unit 120, it can protect the temperature sensing unit 120 and prevent the temperature sensing unit 120 from detaching from the battery cell stack 110.

[0104] Figure 11 This is a perspective view showing an example of a battery cell stack housed in a housing according to one embodiment of the present disclosure. Figure 12 yes Figure 11 An exploded 3D diagram.

[0105] Reference Figure 11 and Figure 12The battery module 10 may include a busbar frame 200 that covers one side of the battery cell stack 110. Electrode leads 101 protruding from a plurality of battery cells 100 may connect to a busbar 210 included in the busbar frame 200. The busbar 210 electrically connects to the battery cells 100 inside the battery module 10. The busbar 210 preferably comprises a metallic material to enable the electrical connection.

[0106] Furthermore, the battery module 10 may include a module frame 300 and an end plate 400, which form an internal space for accommodating the battery cell stack 110. The module frame 300 may have an open structure with one surface open and the other surface open on the opposite side. More specifically, based on the battery cell stack 110, the module frame 300 may be open in two directions in which the electrode leads 101 protrude.

[0107] The module frame 300 according to embodiments of the present disclosure may include: a U-shaped frame 310 covering the lower surface and two side surfaces of the battery cell stack 110; and a top cover 320 covering the open upper surface of the U-shaped frame 310. The U-shaped frame 310 and the top cover 320 may engage with each other between their corresponding edges.

[0108] In another embodiment of this disclosure, the module frame may be a single frame type in which the upper surface, lower surface and two side surfaces are integral.

[0109] Multiple end plates 400 can be configured and can cover two open sides of the module frame 300. The battery cell stack 110 is housed within the internal space formed by the module frame 300 and the end plates 400, thus providing physical protection for the battery cell stack 110. For this purpose, the module frame 300 and the end plates 400 can comprise a metallic material with a predetermined strength. Furthermore, the module frame 300 and the end plates 400 can be joined by welding when their corresponding corners come into contact with each other.

[0110] Furthermore, although the battery cell stack 110 has been described as being housed within the module frame 300 and end plate 400 to form the battery module 10, this is not intended to be limiting. For example, the battery cell stack 110 may be housed within a battery pack housing (not shown) to form a battery pack.

[0111] Figure 13 This is a cross-sectional view of a battery module according to another embodiment of the present disclosure. Figure 14 This is a perspective view showing the structure of a temperature sensing unit disposed in a battery cell stack according to another embodiment of the present disclosure. Figure 15 yes Figure 14 An exploded 3D diagram. Figure 16 It is used for explanation Figure 14 An exploded perspective view of the compression pad and heat-conducting components shown.

[0112] Reference Figures 13 to 16 According to another embodiment of this disclosure, the battery module 10 may include a battery cell stack 110. The battery cell stack 110 may include a plurality of battery cells 100 stacked in one direction and compression pads 150. Compression pads 150 may be disposed between two adjacent battery cells 100. One or more compression pads 150 may be provided, and when multiple compression pads 150 are provided, they may be spaced apart from each other. That is, each of the multiple compression pads 150 may be disposed between the multiple battery cells 100. Furthermore, compression pads 150 may be disposed on the outermost battery cell 100. For example, compression pads 150 may be disposed between the outermost battery cell 100 and a side surface portion of the module frame 300.

[0113] The heat-conducting member 121 can be placed on the compression pad 150. More specifically, at least a portion of the contact portion 122 of the heat-conducting member 121 can be disposed between the compression pad 150 and the battery cell 100 adjacent to the compression pad 150.

[0114] The compression pad 150 may include a receiving groove 151 having a shape corresponding to the shape of the compression pad 150, such that a contact portion 122 of the heat-conducting member 121 is received therein. The contact portion 122 of the heat-conducting member 121 can contact an adjacent battery cell 100 when received in the receiving groove 151. In this case, the contact portion 122 of the heat-conducting member 121 can be received in the receiving groove 151 in a manner that is integrally flattened with the large area of ​​the compression pad 150. That is, even though the contact portion 122 of the heat-conducting member 121 is received in the receiving groove 151, the heat-conducting member 121 does not need to protrude from the large area of ​​the compression pad 150. Therefore, the heat-conducting member 121 and the compression pad 150 received in the receiving groove 151 can have an integrally flat surface.

[0115] Therefore, even if the contact portion 122 is accommodated in the receiving groove 151 of the compression pad 150, the battery cell 100 will not be pressed and / or deformed by the contact portion 122. Therefore, even if expansion occurs on the battery module 10, damage to the battery cell 100 due to the heat-conducting member 121 can be prevented.

[0116] Furthermore, despite Figures 13 to 16 The implementation shows the application Figure 5 The temperature sensing unit 120 is an example, but this disclosure is not limited thereto. That is, it can be applied to… Figure 7The temperature sensing unit 120, including the extension section 125, Figure 8 The temperature sensing unit 120 includes an extension 126 and a hook 127. Figure 9 The temperature sensing unit 120, including the heat insulation component 130, Figure 10 The reinforcing member 140, etc., used to support the temperature sensing unit 120, can be modified and changed in various ways. Additionally, refer to... Figures 5 to 16 The described implementations can be modified and changed in various ways, for example by connecting them to each other.

[0117] In addition, the above reference Figures 5 to 16 The described embodiment has been described as having a single temperature sensor 124 disposed between adjacent battery cells 100 or between a battery cell 100 and a compression pad 150. However, depending on the design, multiple temperature sensors 124 may be disposed within the battery cell stack 110. The multiple temperature sensors 124 are preferably disposed at equal intervals, but this is not necessarily the case. If there is a location within the battery cell stack 110 where temperature rise is concentrated, the temperature sensor 124 may be disposed at or near that location.

[0118] For example, two temperature sensors 124 can be disposed in the battery cell stack 110. A heat-conducting member 121 is disposed between the two battery cells 100 closest to the center of the battery cell stack 110 and between the two outermost battery cells 100, and the temperature sensors 124 can be respectively connected to the heat-conducting member 121.

[0119] In addition, the heat-conducting component 121 is disposed between the compression pad 150 located at the center closest to the battery cell stack 110 and the battery cell 100 in contact with the compression pad 150, and is disposed between the outermost battery cell 100 among the plurality of battery cells 100 and the compression pad 150 abutting against the outermost battery cell 100, and the temperature sensor 124 can be respectively connected to the heat-conducting component 121.

[0120] Since the temperature sensor 124 is configured to contact the central battery cell 100 and the outermost battery cell 100 of the battery cell stack 110, it is easy to measure the temperature deviation within the battery module 10.

[0121] The battery module 10 according to the above embodiment can be included in a battery pack. The battery pack may have a structure that aggregates one or more battery modules according to this embodiment, and is packaged together with a BMS and a cooling device for controlling and managing the temperature, voltage, etc. of the battery.

[0122] The battery pack according to this embodiment may include a processor (not shown), which may be integrated into the BMS or disposed separately outside the BMS and capable of remote communication with the BMS. The processor may include, for example, a microcontroller unit (MCU). The processor may convert the measured temperature value of the battery cell 100 measured by the temperature sensor 124 of the battery module 10 into an actual temperature value based on the shape and characteristics of the thermally conductive member 121. For example, the processor may convert the measured temperature value of the battery cell 100 into an actual temperature value based on the length of the contact portion 122 of the thermally conductive member 121 and the thermal conductivity of the thermally conductive member 121.

[0123] Battery modules and battery packs including such battery modules can be applied to a variety of devices. Such devices can be applied to vehicle devices and / or energy storage systems (ESS) such as electric bicycles, electric vehicles, or hybrid vehicles, but this disclosure is not limited thereto, and can be applied to a variety of devices that can use battery modules and battery packs including such battery modules, which also fall within the scope of this disclosure.

[0124] While preferred embodiments of the present disclosure have been described in detail, the scope of the present disclosure is not limited to these embodiments, but also includes various modifications and improvements made by those skilled in the art using the concepts defined in the appended claims.

[0125] [Explanation of reference numerals in the attached figures]

[0126] 10: Battery Module

[0127] 100: Battery cell

[0128] 110: Battery cell stack

[0129] 120: Temperature sensing unit

[0130] 121: Thermal conductive components

[0131] 122: Contact Department

[0132] 123: Installation Department

[0133] 124: Temperature sensor

[0134] 125: Extension Section

[0135] 126: Extension

[0136] 127: Hook

[0137] 130: Thermal insulation components

[0138] 131: Sensor housing

[0139] 140: Reinforcing Component

[0140] 150: Compression Pad

[0141] 151: Receiving tank

[0142] 200: Busbar Framework

[0143] 210: Busbar

[0144] 300: Module Framework

[0145] 400: End plate

Claims

1. A battery module, the battery module comprising: A battery cell stack in which multiple battery cells are stacked along one direction; as well as A temperature sensing unit is disposed in the battery cell stack. The temperature sensing unit includes: A thermally conductive member configured to at least partially contact the battery cell; and A temperature sensor is attached to the thermally conductive component to measure the temperature of the battery cell.

2. The battery module according to claim 1, in, The heat-conducting component includes a contact portion and a mounting portion. The contact portion is in contact with the cell body of the battery cell, and the temperature sensor is disposed on the mounting portion.

3. The battery module according to claim 2, in, The mounting portion folds and extends from one end of the contact portion and is positioned outside the battery cell stack.

4. The battery module according to claim 2, in, The contact portion includes a first portion and a second portion, the first portion being in contact with the cell body, and the second portion extending from the first portion to protrude outside the battery cell.

5. The battery module according to claim 4, in, The thermally conductive component further includes an extension portion that is connected to the first portion and contacts the cell body. The area of ​​the extension is larger than the area of ​​the first part.

6. The battery module according to claim 5, in, The area of ​​the extension is 0.1 to 1 times the area of ​​the main body of the battery cell.

7. The battery module according to claim 4, in, The heat-conducting component also includes: An extension portion, the extension portion extending from the first portion in a direction toward the lower portion of the battery cell; and The hook portion is folded from the end of the extension toward the direction in which the plurality of battery cells are stacked.

8. The battery module according to claim 2, in, The contact portion is arranged parallel to the large area of ​​the battery cell, and the mounting portion extends along the one direction so as to be orthogonal to the contact portion.

9. The battery module according to claim 2, in, The contact portion includes a pair of contact portions arranged facing each other, and The mounting portion is disposed between the pair of contact portions to connect the contact portions.

10. The battery module according to claim 2, in, The contact portion is formed in the shape of a thin film or a line.

11. The battery module according to claim 1, The battery module also includes a reinforcing member that supports at least a portion of the temperature sensing unit.

12. The battery module according to claim 1, in, The heat-conducting member is disposed at at least in one of the following locations: between the two battery cells closest to the center of the battery cell stack and between the two outermost battery cells.

13. The battery module according to claim 1, The battery module also includes a compression pad, which is positioned at least at one location among two adjacent battery cells and at the outermost battery cell. in, The heat-conducting component is disposed on the compression pad.

14. The battery module according to claim 13, in, The compression pad includes a receiving groove in which at least a portion of the thermally conductive member is received.

15. The battery module according to claim 14, in, The thermally conductive component includes a contact portion and a mounting portion. The contact portion contacts the cell body of the battery cell, and the temperature sensor is disposed on the mounting portion. At least a portion of the contact portion is accommodated in the receiving groove, and The mounting portion folds and extends from one end of the contact portion and is positioned outside the battery cell stack.

16. The battery module according to claim 14, in, The at least portion of the heat-conducting member is housed in the receiving groove in a manner that is integrally planar with the large area of ​​the compression pad.

17. The battery module according to claim 1, in, The thermally conductive component further includes a thermally insulating component, which covers the portion of the thermally conductive component that is not in contact with the battery cell body.

18. The battery module according to claim 17, in, The thermal insulation member includes a sensor housing, in which a portion of the thermally conductive member is exposed to the outside, and The temperature sensor is disposed in the sensor housing.

19. A battery pack comprising the battery module according to claim 1.

20. An energy storage system comprising a battery pack according to claim 19.

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