Battery pack

Abstract

The battery pack includes: a battery cell including at least one terminal portion; a battery case accommodating the battery cells; a tab plate in contact with the at least one terminal portion, the tab plate including nickel; and an adhesive tape between the tab plate and the battery cell.

Description

[0001] Cross-references to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2024-0111524, filed on August 20, 2024, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical Field

[0003] This disclosure relates to battery packs. Background Technology

[0004] Recently, with the rapid proliferation of battery-powered electronic devices such as cellular phones and laptops, and electric vehicles, the demand for rechargeable batteries with high energy density and high capacity is increasing rapidly. Accordingly, research and development to improve the performance of lithium rechargeable batteries are underway.

[0005] A lithium-ion secondary battery is a battery that includes a positive electrode, a negative electrode, and an electrolyte. The positive and negative electrodes contain active materials capable of inserting and deintercalating lithium ions. When lithium ions are inserted into or deintercalated from the positive and negative electrodes, the lithium-ion secondary battery generates electrical energy through oxidation and reduction reactions.

[0006] The information disclosed in the description of the related technologies in this disclosure is only intended to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute related technologies. Summary of the Invention

[0007] A battery pack according to an embodiment of the present disclosure includes: a battery cell including at least one terminal portion; a battery housing for housing the battery cell; and a terminal plate in contact with at least one terminal portion, the terminal plate including nickel and an adhesive strip between the terminal plate and the battery cell.

[0008] Based on a 100wt% terminal block, the terminal block may include more than 95wt% nickel.

[0009] Adhesive tapes can be constructed to be impermeable to electrolytes and moisture.

[0010] The adhesive tape can be single-sided or double-sided, and it is attached to the battery cell and surrounds the outer periphery of the terminal portion.

[0011] The adhesive tape can be circular or dotted.

[0012] The battery cell may include: a cylindrical housing having a main body portion, a bottom portion connected to a first side of the main body portion, a rolled portion bent inward toward the main body portion, and a crimped portion at a second side of the main body portion; an electrode assembly housed in the cylindrical housing; and a cover assembly sealing the cylindrical housing at the second side of the main body portion, with a terminal portion at the top of the cover assembly.

[0013] Adhesive tape can be applied between the connector plate and the crimped part.

[0014] The adhesive tape can be ring-shaped, and the distance from the inner circumferential surface of the adhesive tape to the terminal portion is approximately the same as the distance to one end of the crimped portion.

[0015] The inner circumferential surface of the adhesive tape may be at least 5 mm away from the terminal portion.

[0016] The battery cell may further include a conduit surrounding a cylindrical housing, with adhesive tape between the terminal block and the conduit.

[0017] One end of the pipe can be between one end of the crimped part and the terminal block.

[0018] The battery pack may further include a gasket between the crimped portion and the conduit.

[0019] The cover assembly may include an upper cover with a terminal portion, a safety vent below the upper cover, a lower cover below the safety vent, and a gasket that insulates the cover assembly from the cylindrical housing, with the end of the gasket away from the electrode assembly tilted upward.

[0020] A battery cell may include an electrolyte, which may include at least one of ethylene carbonate, ethyl methyl carbonate, and dimethyl carbonate. Attached Figure Description

[0021] Features will become apparent to those skilled in the art from the detailed description of exemplary embodiments with reference to the accompanying drawings, in which:

[0022] Figure 1 and Figure 2 This is an exploded perspective view of a battery pack according to an embodiment of the present disclosure;

[0023] Figure 3 This is a schematic perspective view of a battery cell according to an embodiment of the present disclosure;

[0024] Figure 4 This is a partial cross-sectional view of a battery cell according to an embodiment of the present disclosure;

[0025] Figure 5 This is a partially enlarged cross-sectional view of the assembly of a battery cell and a terminal block in a battery pack according to an embodiment of the present disclosure.

[0026] Figures 6 to 8 This is a top plan view of a battery cell including an adhesive tape according to an embodiment of the present disclosure;

[0027] Figure 9 This is a partially enlarged cross-sectional view of the assembly of a battery cell and a terminal block in a battery pack according to another embodiment of this disclosure; and

[0028] Figure 10 and Figure 11 This is a diagram used to illustrate a vehicle including a battery pack according to an embodiment of the present disclosure. Detailed Implementation

[0029] Example embodiments will now be described more fully below with reference to the accompanying drawings; however, example embodiments may be implemented in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey exemplary embodiments to those skilled in the art.

[0030] In the accompanying drawings, the dimensions of layers and regions may be exaggerated for clarity. It should also be understood that when a layer or element is referred to as "on" another layer or substrate, it may be directly on that layer or substrate, or there may be intervening layers. Furthermore, it will be understood that when a layer is referred to as "between" two layers, it may be the only layer between those two layers, or there may be one or more intervening layers. The same reference numerals refer to the same elements throughout.

[0031] Additionally, when used herein, the terms “comprising” and / or “including” specify the presence of the mentioned shapes, quantities, steps, operations, components, elements and / or groups thereof, and do not exclude the presence or addition of one or more other shapes, quantities, operations, components, elements and / or groups thereof.

[0032] The statement that two objects being compared are “identical” means that the two objects are “substantially identical.” Therefore, “substantially identical” can include deviations considered low in the art (e.g., less than 5%). Furthermore, the consistency of parameters in a region can be consistency from an average perspective.

[0033] Although the terms "first," "second," etc., are used to describe various components, these components are not limited to these. These terms are used to distinguish one component from another, and unless otherwise specified, the first component can be the second component.

[0034] Throughout this instruction manual, unless otherwise stated, each component may be singular or plural.

[0035] When any component is referred to as being disposed on the “upper surface (or lower surface)” of a component or “above (or below)” a component, this not only means that any component is disposed in contact with the upper (or lower) surface of the component, but also means that other components may be located between the component and any components disposed on (or below) the component.

[0036] When a component is described as being “connected,” “linked,” or “attached” to another component, the components may be directly connected or linked to each other. However, it should be understood that other components may be “between” the components, or the components may be “connected,” “linked,” or “attached” to other components. When a part is described as being “electrically connected” to another part, this includes not only the case where it is directly connected, but also the case where it is connected to another element between them.

[0037] In the specification, unless otherwise specified, "A and / or B" means A, B, or A and B. In other words, "and / or" includes all or any combination of the listed components. In the specification, unless otherwise specified, "C to D" means C and below D.

[0038] The terminology used in this specification is for describing embodiments of this disclosure and is not intended to limit this disclosure.

[0039] A battery pack according to an embodiment of the present disclosure includes: a battery cell comprising at least one terminal portion; a battery casing housing the battery cell; and a terminal plate in contact with the terminal portion; wherein the terminal plate comprises nickel, and an adhesive strip is located between the terminal plate and the battery cell.

[0040] Figure 1 and Figure 2 This is an exploded perspective view of a battery pack according to an embodiment of the present disclosure. Figure 1 The diagram shows only the terminal block separated from the battery casing, and Figure 2 This is a view showing the cover and the terminal block attached to the cover separated from the battery housing. For clarity, components such as busbars, cooling units, and external terminals for electrical connections to the battery are omitted in the accompanying drawings.

[0041] like Figure 1 and Figure 2 As shown, the battery pack may include battery cells 100 (e.g., first battery cell 100a and second battery cell 100b), a battery housing 1000 that houses the battery cells 100, and terminal blocks 1100a and 1100b that electrically connect the battery cells 100.

[0042] The battery housing 1000 may include an intermediate housing 1000a and a first cover 1000b and a second cover 1000c connected to the intermediate housing 1000a. For example, the intermediate housing 1000a may be located between the first cover 1000b and the second cover 1000c, which face each other. The battery housing 1000 may be formed as a three-part structure consisting of the intermediate housing 1000a, the first cover 1000b, and the second cover 1000c, and space (e.g., a volumetric space surrounded by the intermediate housing 1000a, the first cover 1000b, and the second cover 1000c) may be provided by combining the intermediate housing 1000a, the first cover 1000b, and the second cover 1000c.

[0043] The battery cell 100 can be housed in the space provided by the intermediate housing 1000a. The battery cells 100 can be arranged in an offset manner (for example, the row of the first battery cell 100a can be offset relative to the row of the second battery cell 100b in the row direction).

[0044] The first cover 1000b can cover the terminal portion of the first battery cell 100a, and the second cover 1000c can cover the terminal portion of the second battery cell 100b. See below. Figure 3 and Figure 4 Explain the terminal section.

[0045] The first cover 1000b and the second cover 1000c may have a first terminal hole C1 and a second terminal hole C2, which are used to expose a first terminal portion 100c and a second terminal portion 100d of each battery cell, respectively. The battery cells can be electrically connected through the first terminal portion 100c exposed from the first terminal hole C1 and the second terminal portion 100d exposed from the second terminal hole C2 of each battery cell. The first terminal portion 100c and the second terminal portion 100d may each have a terminal hole C1 and a second terminal portion 100d exposed from the second terminal hole C2, respectively. Figure 3 The terminal portion 141 and the bottom portion 122 have the same configuration.

[0046] The terminal block may include a first terminal block 1100a and a second terminal block 1100b. The first terminal block 1100a, which contacts the terminal portion of the first battery cell 100a, may be disposed on the first cover 1000b. The second terminal block 1100b, which contacts the terminal portion of the second battery cell 100b, may be disposed on the second cover 1000c.

[0047] The first terminal plate 1100a may include a flat body M disposed on the first cover 1000b and a first contact portion C3 and a second contact portion C4 protruding to different depths from the body M toward the first terminal portion and the second terminal portion of the battery cell. The second terminal plate 1100b may include a flat body M disposed on the second cover 1000c and a first contact portion C3 and a second contact portion C4 protruding to different depths from the body M toward the first terminal portion and the second terminal portion of the battery cell. See, for example... Figure 1 The first contact portion C3 in the first terminal plate 1100a and the second contact portion C4 in the second terminal plate 1100b protrude toward each other. Similarly, the second contact portion C4 in the first terminal plate 1100a and the first contact portion C3 in the second terminal plate 1100b protrude toward each other.

[0048] Figure 3 This is a schematic perspective view of the first battery cell 100a, and Figure 4 This is a partial cross-sectional view of the first battery cell 100a. The structure of the second battery cell 100b is the same as or substantially the same as that of the first battery cell 100a.

[0049] like Figure 3 and Figure 4 As shown, each of the first battery cell 100a and the second battery cell 100b may include an electrode assembly 110, a housing 120 housing the electrode assembly 110 and an electrolyte, a cover assembly 130 coupled to an open side of the housing 120 to seal the housing 120, and an upper insulating plate 180 located between the electrode assembly 110 and the cover assembly 130 within the housing 120. The terminal portion of the battery cell may be on top of the cover assembly 130.

[0050] The electrode assembly 110 may include a diaphragm 113 and a first electrode 111 and a second electrode 112, the diaphragm 113 being located between the first electrode 111 and the second electrode 112, and the electrode assembly 110 may be wound into an electrode core shape.

[0051] The first electrode 111 may include a first substrate and a first active material layer located on the first substrate. A first lead tab 114 may extend outward from a first uncoated portion of the first substrate, where the first active material layer is not located, and the first lead tab 114 may be electrically connected to the cover assembly 130.

[0052] The second electrode 112 may include a second substrate and a second active material layer located on the second substrate. A second lead tab 115 may extend outward from a second uncoated portion of the second substrate, where the second active material layer is not located, and the second lead tab 115 may be electrically connected to the housing 120. The first lead tab 114 and the second lead tab 115 may extend in opposite directions.

[0053] The first electrode 111 can serve as a positive electrode. In this case, the first substrate can be composed of, for example, aluminum foil, and the first active material layer can include, for example, a transition metal oxide.

[0054] The second electrode 112 can serve as a negative electrode. In this case, the second substrate can be composed of, for example, copper foil or nickel foil, and the second active material layer can include, for example, graphite.

[0055] The separator 113 is used to prevent short circuits between the first electrode 111 and the second electrode 112, while allowing lithium ions to move. The separator 113 can be composed of, for example, a polyethylene membrane, a polypropylene membrane, or a polyethylene-polypropylene membrane.

[0056] The housing 120 can accommodate the electrode assembly 110 and the electrolyte, and can form the shape of a secondary battery together with the cover assembly. The housing 120 may include a generally cylindrical body portion 121 and a bottom portion 122 connected to one side of the body portion 121. For example, the housing 120 may be made of nickel-plated iron.

[0057] The inwardly deformable crimped portion 123 can be located within the main body portion 121, and the inwardly bent crimped portion 124 can be located on the other side of the main body portion 121 (e.g., the open side). The crimped portion 123 can suppress movement of the electrode assembly 110 within the housing 120 and can assist in securing the gasket 190 and the cover assembly 130. The crimped portion 124 can securely fasten the cover assembly 130 by pressing the edge of the cover assembly 130 through the gasket 190.

[0058] The cover assembly 130 can be secured to the interior of the crimp portion 124 via a gasket 190 to seal the housing. The cover assembly 130 may include an upper cover 140, a safety vent 150, and a lower cover 170. However, the cover assembly 130 can be modified in various ways.

[0059] The top cover 140 may be located at the uppermost side of the cover assembly 130. The top cover 140 may include a terminal portion 141 that convexly projects upward and connects to an external circuit, a connecting portion 142 located outside the terminal portion 141, and a connecting portion 143 connecting the terminal portion 141 and the connecting portion 142. The top cover 140 may have an outlet located around the terminal portion 141 for venting gas.

[0060] The safety vent 150 may be located below the cover 140. The safety vent 150 may include a protrusion 151 that convexly downwards and connects to the base plate 171, a vent contact portion 152 located outside the protrusion 151 (e.g., relative to the periphery of the protrusion 151) and in contact with the connecting portion 142 of the cover 140, at least one recess 154 located around the protrusion 151, and a vent extension portion 153 that is bent from the protrusion 151 (e.g., from the vent contact portion 152) and extends to cover a portion of the upper surface of the cover 140 (e.g., thus, the connecting portion 142 at the edge of the cover 140 may be between the vent contact portion 152 and the vent extension portion 153 of the safety vent 150).

[0061] When gas is generated due to overcharging or abnormal operation of the secondary battery, the protrusion 151 of the safety vent 150 can deform upward due to pressure and separate from the base plate 171, while the safety vent 150 can be cut along the notch 154. The safety vent 150 cut along the notch 154 can prevent the secondary battery from exploding by releasing the gas to the outside.

[0062] The lower cover 170 may be located below the safety vent 150. A first opening for exposing the safety vent 150 and a second opening for venting gas may be located in the lower cover 170. An insulating member 160 (e.g., an insulator) may be located between the safety vent 150 and the lower cover 170 to insulate the safety vent 150 from the lower cover 170.

[0063] The base plate 171 can be located below the lower cover 170. The base plate 171 can be fixed to the lower surface of the lower cover 170 to block the first opening of the lower cover 170, and the protrusion 151 of the safety vent 150 can be fixed to the base plate 171. The first lead connector 114 extending from the electrode assembly 110 can be fixed to the base plate 171. Therefore, the upper cover 140, the safety vent 150, the lower cover 170, and the base plate 171 can be electrically connected to the first electrode 111 of the electrode assembly 110.

[0064] The upper insulating plate 180 may be positioned below the coiled portion 123 to contact the electrode assembly 110, and the upper insulating plate 180 may have a tab opening through which a first lead tab 114 extends. The cover assembly 130, electrically connected to the first electrode 111 via the first lead tab 114, faces the electrode assembly 110 when the upper insulating plate 180 is positioned between the cover assembly 130 and the electrode assembly 110, and the cover assembly 130 may be insulated from the electrode assembly 110 by the upper insulating plate 180.

[0065] The housing 120 can have various shapes, such as cylindrical and bag-shaped. Additionally, the housing 120 can be made of metals such as aluminum, aluminum alloys, or nickel-plated steel, or of the laminated film or plastic that forms the bag.

[0066] According to embodiments of the present disclosure, a battery cell includes an adhesive tape 300 between the battery cell and a terminal block. The adhesive tape 300 can prevent corrosion of the battery pack's terminal block (e.g., possibly caused by a reaction between residual electrolyte in the battery cell and moisture caused by condensation during changes in the external environment) and can prevent short circuits between the battery cell and the battery pack's terminal block.

[0067] In detail, when the battery cell is reused and the adhesive tape according to this disclosure is not included, the electrolyte of the battery cell may remain in the crimp portion 124. For example, the electrolyte may remain between the crimp portion 124 and the gasket 190.

[0068] Specifically, see Figure 5 If the battery cell does not include the adhesive tape 300, the electrolyte may move along the interface between the crimp portion 124 and the pad 190 when the end 190a, which is away from the electrode assembly, is tilted upwards in the end 190a of the pad 190 in the battery cell. If the battery pack is used outdoors, condensation may occur due to changes in the external environment, such as temperature variations between room temperature and low temperatures, and relative humidity variations between high humidity and low humidity, and moisture may flow into the space between the terminal block and the battery cell.

[0069] When a battery cell is stored for an extended period and repeatedly used, the crimped portion 124 and the terminal plate may react with the electrolyte. Additionally, moisture introduced due to changes in the external environment may corrode the crimped portion 124 and the terminal plate. Figure 5 As shown, even when a conduit 200 is provided around the outer circumferential surface of the battery cell housing, corrosion may still break through the conduit, causing a short circuit between the positive and negative electrodes of the battery cell.

[0070] Figure 5 This is a partially enlarged cross-sectional view of the assembly of battery cells and terminal blocks in a battery pack according to an embodiment of this disclosure. See also... Figure 5 According to an example embodiment, the battery pack includes a terminal plate 1100a that contacts the top cover 140 of the battery cell (e.g., the terminal portion 141 of the top cover 140), and the battery pack includes an adhesive strip 300 located between the first battery cell 100a and the terminal plate 1100a. The terminal plate 1100a comprises nickel.

[0071] According to an embodiment, based on 100 wt% of the terminal plate 1100a, the terminal plate 1100a includes an amount of 95 wt% or more of nickel. Compared to terminal plates that include different types of metals (i.e., based on 100 wt% of the terminal plate, terminal plates that include less than 95 wt% of metals other than nickel or nickel), the terminal plate 1100a based on 100 wt% of the terminal plate 1100a, which includes more than 95 wt% of nickel, can significantly reduce corrosion by greatly reducing or suppressing surface discoloration and oxidation caused by reaction with the electrolyte.

[0072] In this regard, the experiment was conducted by changing the material of the terminal block while exposing the terminal block to electrolyte and moisture.

[0073] <Experimental Methods>

[0074] (1) The following terminal blocks were prepared: a terminal block comprising nickel (99 wt% nickel), a terminal block coated with nickel and comprising iron (93 wt% iron, 1 wt% carbon, 1 wt% manganese and 5 wt% nickel), a terminal block comprising copper (99 wt% copper) and a terminal block coated with tin and comprising copper (99.7 wt% copper and 0.3 wt% tin).

[0075] (2) After the terminal block was completely immersed in the electrolyte, the changes in the terminal block were observed, and the results were summarized in Table 1 below.

[0076] The electrolyte comprises ethylene carbonate (16.22 wt%), ethyl methyl carbonate (12.28 wt%), and dimethyl carbonate (39.22 wt%) as electrolytic solvents, LiPF6 (15.48 wt%) and LiTFSI (3.99 wt%) as electrolytes, and other additives such as fluoroethylene carbonate, vinylene carbonate, adiponitrile, LiBF4, and succinate as residues.

[0077] (3) While bringing the terminal plate into contact with the electrolyte according to step (2), the terminal plate is also brought into contact with moisture. To bring the terminal plate into contact with moisture, water is introduced into the dropper, and 3 drops are added intermittently to the electrolyte. The results are shown in Table 1 below.

[0078] [Table 1]

[0079]

[0080] As shown in Table 1, the terminal plate including nickel can significantly reduce the inhibition of surface discoloration and oxidation due to reaction with the electrolyte. For example, the terminal plate may include 95 wt% to 100 wt% (e.g., 99 wt% to 100 wt%) of nickel.

[0081] The electrolyte may include at least one of ethylene carbonate, methyl ethyl carbonate, and dimethyl carbonate, and may include at least one of LiPF6, lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), and LiBF4 as the electrolyte. For example, the electrolyte may include ethylene carbonate, methyl ethyl carbonate, and dimethyl carbonate in a weight ratio of 1:0.5 to 3:1 to 5. For example, the electrolyte may include 10 wt% to 30 wt% (e.g., 10 wt% to 20 wt%) of electrolyte. For example, the electrolyte may further include at least one of fluoroethylene carbonate, vinylene carbonate, adiponitrile, and succinate.

[0082] The adhesive tape 300 applied to battery cells, including terminal plates containing only nickel, significantly improves the effectiveness of preventing corrosion of the battery pack's terminal plates due to the reaction between residual electrolyte in the battery cells and moisture caused by condensation during changes in the external environment, and also prevents short circuits between the battery cells and the battery pack's terminal plates. According to an embodiment, the adhesive tape 300 can be configured to be impermeable to both electrolyte and moisture. The adhesive tape 300 is located between the battery cells and the terminal plate 1100a, preventing the electrolyte from contacting the terminal plate via the crimping portion, and easily preventing moisture generated by condensation from contacting the crimping portion via the terminal plate.

[0083] "Impermeability" means that when the adhesive tape is fully immersed in an electrolyte or moisture and left for a predetermined period of time (e.g., 10 days), the weight change rate of the adhesive tape is less than 1%, for example, more than 0% and less than 1%. The electrolyte and moisture impermeable adhesive tape 300 can be manufactured by any suitable method, or commercially available products can be purchased and applied as adhesive tapes.

[0084] The adhesive tape 300 can be single-sided or double-sided. Double-sided adhesive tape can be stably fixed between the battery cell and the terminal block.

[0085] For example, adhesive tape 300 may include a base layer and an adhesive layer formed on one side of the base layer. In another example, adhesive tape 300 may include a base layer and adhesive layers formed on both sides of the base layer. The base layer may be, for example, a membrane made of a polymer and impermeable to electrolytes and moisture. The adhesive layers impart a predetermined adhesive force to the base layer and may preferably include an adhesive resin and / or a crimped portion and / or the conduit described below that impart the predetermined adhesive force to the terminal block.

[0086] The adhesive tape 300 can be adhered to (or attached to) the battery cell to surround the outer periphery of the terminal portion of the battery cell, which can improve the effect of inhibiting electrolyte from penetrating into the battery cell from any direction and / or moisture from penetrating into the battery cell from any direction via the terminal plate.

[0087] Figures 6 to 8 The figure shows a top plan view of a battery cell including an adhesive tape 300 according to an embodiment of the present disclosure.

[0088] like Figure 6 As shown, a battery cell according to an embodiment of the present disclosure may include an annular adhesive tape 300, and the annular adhesive tape 300 may be adhered to the top cover 140 of the battery cell, for example, to surround the outer periphery of the terminal portion 141. The annular adhesive tape 300 may have an outer circumferential surface 302 and an inner circumferential surface 301, and may be a closed adhesive tape without an empty space between the outer circumferential surface 302 and the inner circumferential surface 301. See, for example, [link to relevant documentation]. Figure 6 As observed in the top view, the adhesive tape 300 may continuously wrap around the entire periphery of the terminal portion 141 (e.g., the adhesive tape 300 may be an O-ring). See, for example, [link to previous section]. Figures 5 to 6 The adhesive tape 300 can be parallel to the terminal plate 1100a and can be directly positioned between the terminal plate 1100a and the conduit 200 surrounding the housing of the battery cell (e.g., and in direct contact with the terminal plate 1100a and the conduit 200 surrounding the housing of the battery cell). One end of the conduit 200 can be between one end of the crimping portion 124 and the terminal plate 1100a.

[0089] For example, the inner circumferential surface 301 of the adhesive tape 300 may be positioned closer to the top cover 140 than to the outer end of the crimping portion 124, for example, closer to the terminal portion 141 than to the outer end of the crimping portion 124. For example, the inner circumferential surface 301 of the adhesive tape 300 may be at least 5 mm away from the top cover 140 in the radial direction, for example, at least 5 mm away from the contact surface of the terminal portion 141 and the terminal block 1100a.

[0090] like Figure 7 As shown, the battery cell according to an embodiment of the present disclosure may include an annular adhesive tape 300a, and the annular adhesive tape 300a may be adhered to the top cover 140 of the battery cell, for example, to the outer periphery (not shown) of the terminal portion 141. The annular adhesive tape 300a may have an outer circumferential surface 302 and an inner circumferential surface 301, and a predetermined empty space 310 may exist between the outer circumferential surface 302 and the inner circumferential surface 301.

[0091] like Figure 8 As shown, a battery cell according to an embodiment of the present disclosure may include an adhesive tape 300b comprising a plurality of dotted adhesive tapes, and the adhesive tape 300b may be adhered at predetermined intervals to surround the top cover 140 of the battery cell (e.g., the outer periphery of the terminal portion 141).

[0092] According to embodiments of this disclosure, the adhesive tape 300 may be positioned between the terminal plate 1100a and the crimping portion 124. When the adhesive tape 300 is positioned between the terminal plate 1100a and the crimping portion 124, the degree of contact between the electrolyte flowing through the crimping portion 124 (e.g., flowing along the surface of the crimping portion 124) and the terminal plate 1100a can be reduced. For example, the inner circumferential surface 301 of the adhesive tape 300 may be positioned closer to the terminal portion 141 of the upper cover 140 than to one end of the crimping portion. For example, see... Figure 5 Along the radial direction of the top cover 140, the inner circumferential surface 301 of the adhesive tape 300 can be between the outer circumferential surface 302 of the adhesive tape 300 and the outer edge of the terminal portion 141.

[0093] The battery cell according to embodiments of this disclosure may further include a gasket surrounding a cylindrical housing.

[0094] Figure 9 This is a partially enlarged cross-sectional view of the assembly of a battery cell and a terminal block in a battery pack according to another embodiment of the present disclosure.

[0095] like Figure 9 As shown, a battery pack according to another embodiment of the present disclosure may include a terminal plate 1100a that contacts the top cover 140 of the battery cell (e.g., contacts the terminal portion 141 of the top cover 140), and the battery pack may include an adhesive tape 300 located between the first battery cell 100a and the terminal plate 1100a.

[0096] The battery pack may further include a gasket 400 surrounding the housing. The gasket 400 may be located between the crimp portion 124 and the terminal plate 1100a, and between the crimp portion 124 and the conduit 200.

[0097] See back Figure 5 The electrode assembly may include a first electrode, a diaphragm, and a second electrode. For example, the first electrode may be a positive electrode, and the second electrode may be a negative electrode.

[0098] The positive electrode of a lithium secondary battery may include a current collector and a positive electrode active material layer formed on the current collector. The positive electrode active material layer includes a positive electrode active material and may further include a binder and / or a conductive material.

[0099] Compounds capable of reversibly inserting and deintercalating lithium (lithiation compounds) can be used as positive electrode active materials. Specifically, composite oxides of one or more types of lithium and metals selected from cobalt, manganese, nickel, and combinations thereof can be used.

[0100] The composite oxide can be a lithium transition metal composite oxide, and specific examples may include lithium nickel oxide, lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate compound, cobalt-free nickel manganese oxide, or combinations thereof.

[0101] As an example, a compound represented by any of the following chemical formulas can be used: Li a A 1-b X b O 2-c D' c (0.90≤a≤1.8, 0≤b≤0.5, and 0≤c≤0.05); Li a Mn 2-b X b O 4-c D' c (0.90≤a≤1.8, 0≤b≤0.5, and 0≤c≤0.05); Li a Ni 1-b-c Co b X c O 2-α D' α (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, and 0<α<2); Li a Ni 1-b-c Mn b X c O 2-α D' α (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, and 0<α<2); Li a Ni b Co c L 1 d G e O2 (0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, and 0≤e≤0.1); Li a NiG b O2 (0.90≤a≤1.8, and 0.001≤b≤0.1); Li a NiG b O2 (0.90≤a≤1.8, and 0.001≤b≤0.1); LiMn1-bGbO2 (0.90≤a≤1.8 and 0.001≤b≤0.1); Li a Mn2G b O4 (0.90≤a≤1.8 and 0.001≤b≤0.1); Li a Mn 1-g G gPO4 (0.90 ≤ a ≤ 1.8 and 0 ≤ g ≤ 0.5); Li (3-f) Fe2(PO4)3 (0 ≤ f ≤ 2); and Li a FePO4 (0.90 ≤ a ≤ 1.8).

[0102] In the above chemical formulae, A can be Ni, Co, Mn or a combination thereof; X can be Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element or a combination thereof; D' can be O, F, S, P or a combination thereof; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V or a combination thereof; and L 1 can be Mn, Al or a combination thereof.

[0103] Based on 100 wt% of the positive electrode active material layer, the content of the positive electrode active material can be 90 wt% to 99.0 wt%, and based on 100 wt% of the positive electrode active material layer, the contents of the binder and the conductive material can each be 0.5 wt% to 5 wt%.

[0104] Al foil can be used as a current collector.

[0105] The negative electrode of the lithium secondary battery includes a current collector and a negative electrode active material layer formed on the current collector. The negative electrode active material layer includes a negative electrode active material and may further include a binder and / or a conductive material.

[0106] The negative electrode active material includes a material capable of reversibly inserting / extracting lithium ions, lithium metal, an alloy of lithium and a metal, a material capable of doping and dedoping lithium, or a transition metal oxide.

[0107] The material capable of reversibly inserting / extracting lithium ions is a carbon-based negative electrode active material and may include, for example, crystalline carbon, amorphous carbon or a combination thereof. Examples of crystalline carbon can be graphite such as natural graphite or artificial graphite, and examples of amorphous carbon can be soft carbon, hard carbon, mesophase pitch carbide, calcined coke, etc.

[0108] Si negative electrode active material or Sn negative electrode active material can be used as a material capable of doping and dedoping lithium. The silicon negative electrode active material can be silicon, a silicon-carbon composite material, SiO x (0 < x ≤ 2, for example, SiO2), a silicon alloy or a combination thereof.

[0109] The silicon-carbon composite material can be a composite material of silicon and amorphous carbon. According to an embodiment, the silicon-carbon composite material can be in the form of silicon particles whose surfaces are coated with amorphous carbon.

[0110] Silicon-carbon composites may further include crystalline carbon. For example, a silicon-carbon composite may include a core comprising crystalline carbon and silicon particles and an amorphous carbon coating on the surface of the core.

[0111] For example, the negative electrode active material layer may include 90 wt% to 99.5 wt% of negative electrode active material, 0.5 wt% to 5 wt% of binder, and 0 wt% to 5 wt% of conductive material.

[0112] The binder can be a non-aqueous binder, an aqueous binder, a dry binder, or a combination thereof. When an aqueous binder is used as a negative electrode binder, it may further include a cellulose-based compound capable of imparting viscosity.

[0113] The negative electrode current collector can be selected from copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, polymer substrate coated with conductive metal, and combinations thereof.

[0114] The electrolyte in a lithium secondary battery consists of a non-aqueous organic solvent and a lithium salt.

[0115] Non-aqueous organic solvents act as a medium through which ions participating in the electrochemical reactions of the battery can move.

[0116] Non-aqueous organic solvents can be carbonate solvents, ester solvents, ether solvents, ketone solvents, alcohol solvents, aprotic solvents, or combinations thereof, and can be used alone or in combination of two or more of them.

[0117] In addition, when using carbonate solvents, a mixture of cyclic carbonates and chain carbonates can be used.

[0118] Depending on the type of lithium-ion secondary battery, a separator may be present between the positive and negative electrodes. The separator can be made of polyethylene, polypropylene, polyvinylidene fluoride, or a multilayer film consisting of two or more layers of these materials.

[0119] The diaphragm may include a porous substrate and a coating comprising an organic material, an inorganic material, or a combination thereof located on one or both sides of the porous substrate.

[0120] Organic materials may include polyvinylidene fluoride polymers or (meth)acrylic acid polymers.

[0121] Inorganic materials may include inorganic particles selected from Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite and combinations thereof.

[0122] Organic and inorganic materials can exist as a mixture in a coating, or they can exist in the form of a coating that includes organic materials and a coating that includes inorganic materials stacked together.

[0123] The battery pack according to embodiments of this disclosure can be installed in a vehicle. The vehicle can be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle. The vehicle includes four-wheeled vehicles or two-wheeled vehicles.

[0124] Figure 10 and Figure 11 This is a diagram used to illustrate a vehicle including a battery pack according to an embodiment of the present disclosure.

[0125] Battery pack 2000 can be installed in vehicle 3000. Battery pack 2000 can be... Figure 1 and Figure 2 The battery pack is shown in the diagram. Vehicle 3000 can be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle. Vehicles include four-wheeled vehicles or two-wheeled vehicles.

[0126] The vehicle 3000 may include a battery module and / or a battery pack 2000 including the battery module according to embodiments of the present disclosure. The vehicle 3000 operates by receiving power from the battery module and / or the battery pack 2000 including the battery module according to embodiments of the present disclosure.

[0127] In summary, lithium-ion batteries are highly susceptible to external environmental influences. These influences include temperature variations from room temperature to low temperatures and humidity changes from relatively high humidity. When lithium-ion batteries are used outdoors, rapid temperature changes can cause condensation on the surface of the battery or the battery pack, allowing moisture to penetrate into the battery or battery pack. Moisture penetration can lead to corrosion of individual battery cells, short circuits between the positive and negative electrodes of individual cells, and even fire.

[0128] Therefore, it may be necessary to provide battery packs that prevent corrosion and short circuits in response to changes in the external environment. Therefore, this disclosure relates to providing a battery pack that prevents corrosion of the battery pack's terminals due to the reaction of the electrolyte in the battery cells and moisture caused by condensation when the external environment changes, and prevents short circuits between the positive and negative electrodes of the battery cells.

[0129] According to this disclosure, a battery pack is provided that resists external environments by preventing corrosion of the battery pack's terminal plates due to the reaction of the electrolyte in the battery cells and moisture caused by condensation when the external environment changes, and by preventing short circuits between the positive and negative electrodes of the battery cells.

[0130] Thus far, exemplary embodiments have been disclosed. Although specific terminology has been used, it is used in a general and descriptive sense only, and is not intended to be limiting. In some cases, as would be apparent to those skilled in the art at the time of filing this application, unless specifically stated otherwise, features, characteristics, and / or elements described in connection with particular embodiments may be used alone or in combination with features, characteristics, and / or elements described in connection with other embodiments. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the spirit and scope of the invention as set forth in the appended claims.

Claims

1. A battery pack, comprising: A battery cell, including at least one terminal portion; Battery casing, which houses the individual battery cells; A terminal block, in contact with the at least one terminal portion, the terminal block comprising nickel; as well as An adhesive tape is placed between the terminal block and the battery cell.

2. The battery pack according to claim 1, wherein, Based on 100 wt% of the terminal block, the terminal block comprises more than 95 wt% nickel.

3. The battery pack according to claim 1, wherein, The adhesive tape is constructed to be impermeable to electrolytes and moisture.

4. The battery pack according to claim 1, wherein, The adhesive tape is a single-sided or double-sided adhesive tape, which is attached to the battery cell and surrounds the outer periphery of the terminal portion.

5. The battery pack according to claim 1, wherein, The adhesive tape is either ring-shaped or dot-shaped.

6. The battery pack according to any one of claims 1 to 5, wherein, The battery cell includes: A cylindrical housing having a main body portion, a bottom portion connected to a first side of the main body portion, a rolled portion bent toward the interior of the main body portion, and a crimped portion at a second side of the main body portion; Electrode assembly, housed within the cylindrical housing; and A cover assembly that seals the cylindrical housing at the second side of the main body portion, with the terminal portion at the top of the cover assembly.

7. The battery pack according to claim 6, wherein, The adhesive tape is between the terminal block and the crimped portion.

8. The battery pack according to claim 6, wherein, The adhesive tape is annular, and the distance from the inner circumferential surface of the adhesive tape to the terminal portion is approximately the same as the distance to one end of the crimped portion.

9. The battery pack according to claim 6, wherein, The inner circumferential surface of the adhesive tape is at least 5 mm away from the terminal portion.

10. The battery pack according to claim 6, wherein, The battery cell further includes a conduit surrounding the cylindrical housing, and the adhesive tape is between the terminal block and the conduit.

11. The battery pack according to claim 10, wherein, One end of the pipe is between one end of the crimped portion and the terminal plate.

12. The battery pack according to claim 10, further comprising: A gasket is placed between the crimped portion and the pipe.

13. The battery pack according to claim 6, wherein, The cover assembly includes an upper cover having the terminal portion, a safety vent below the upper cover, a lower cover below the safety vent, and a gasket that insulates the cover assembly from the cylindrical housing, the end of the gasket away from the electrode assembly being inclined upward.

14. The battery pack according to any one of claims 1 to 5, wherein, The battery cell includes an electrolyte, which includes at least one of ethylene carbonate, ethyl methyl carbonate, and dimethyl carbonate.

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