Secondary battery

Abstract

The present disclosure relates to a secondary battery, and the technical problem to be solved is to provide a secondary battery allowing reduced welding resistance between electrode tabs and terminals and rapid heat dissipation when a plurality of electrode assemblies are being installed in a single case. To that end, provided is a secondary battery comprising: a plurality of electrode assemblies, each provided with a negative electrode plate having a uncoated negative electrode region and a positive electrode plate having a uncoated positive electrode region; a case for accommodating the electrode assemblies; a cap plate for covering the open entry of the case; negative electrode terminals, in equal numbers as the electrode assemblies, provided on the cap plate and electrically connected to the uncoated negative electrode regions; and positive electrode terminals provided on the side of the case opposite to the negative electrode terminals, and electrically connected to the uncoated positive electrode regions.

Description

secondary battery

[0001] The present disclosure relates to a secondary battery.

[0002] Secondary batteries, unlike non-rechargeable primary batteries, are rechargeable and dischargeable. Low-capacity secondary batteries are used in small, portable electronic devices such as smartphones, feature phones, laptops, digital cameras, and camcorders, while large-capacity secondary batteries are widely used as power sources for motor drives and power storage in hybrid and electric vehicles. These secondary batteries include an electrode assembly comprising a positive and negative electrode, a case housing the electrode assembly, and electrode terminals connected to the electrode assembly.

[0003] The above-described information disclosed in the background technology of this invention is only intended to improve understanding of the background of the present invention, and therefore may include information that does not constitute prior art.

[0004] The present invention relates to a secondary battery that reduces welding resistance between electrode tabs and terminals and enables rapid and easy heat dissipation when a plurality of electrode assemblies are installed in one case.

[0005] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0006] An exemplary secondary battery according to one embodiment of the present invention for solving the above technical problem may include a plurality of electrode assemblies including a negative electrode plate having a negative electrode non-coated portion and a positive electrode plate having a positive electrode non-coated portion, a case in which the electrode assemblies are accommodated inside, a cap plate covering an opened entrance of the case, a negative terminal installed on the cap plate in the same number as the electrode assemblies and electrically connected to the negative electrode non-coated portion, and a positive terminal installed on the case in a direction opposite to the negative terminal and electrically connected to the positive electrode non-coated portion.

[0007] In some examples, the number of positive electrode densities may be greater than the number of negative electrode densities.

[0008] In some examples, the electrode assembly may be formed as a stack-type electrode assembly in which positive plates, separators, and negative plates are alternately stacked.

[0009] In some examples, the electrode assembly may include a first electrode assembly having a first cathode-free portion protruding upwardly and positioned on one widthwise side, and a second electrode assembly installed in series with the first electrode assembly and having a second cathode-free portion protruding upwardly and positioned on the other widthwise side.

[0010] In some examples, the first electrode assembly may include a first positive electrode non-conductive portion protruding from the lower side of the first electrode assembly and positioned on both sides in the width direction of the first electrode assembly.

[0011] In some examples, the second electrode assembly may include a second positive electrode non-conductive portion protruding downwardly from the second electrode assembly and positioned on both sides of the second electrode assembly in the width direction.

[0012] In some examples, the positive terminal may include a positive current collector plate electrically connected to the first positive uncoated portion and the second positive uncoated portion, a positive current collector plate electrically connected to the positive current collector plate and extending toward the outside of the cap plate, and a positive terminal cover positioned on the outside of the case and connected to the positive current collector plate to transmit current.

[0013] In some examples, the negative terminal may include a first negative terminal located on one widthwise side of the cap plate and electrically connected to the first negative electrode non-conductive portion, and a second negative terminal located on the other widthwise side of the cap plate and electrically connected to the second negative electrode non-conductive portion.

[0014] In some examples, the first negative terminal may include a first collector plate electrically connected to the first negative electrode non-conductive portion, a first rivet electrically connected to the first collector plate and extending toward the outside of the cap plate, and a first terminal cover positioned on the outside of the cap plate and connected to the first rivet to transmit current.

[0015] In some examples, the second negative terminal may include a second collector plate electrically connected to the second negative electrode non-conductive portion, a second rivet electrically connected to the second collector plate and extending toward the outside of the cap plate, and a second terminal cover positioned on the outside of the cap plate and connected to the second rivet to transmit current.

[0016] In some examples, the number of positive electrode densities may be twice that of negative electrode densities.

[0017] An exemplary secondary battery according to one embodiment of the present invention for solving the above technical problem may include an electrode assembly in which a negative electrode plate having a negative electrode non-conducting portion, a positive electrode plate having a positive electrode non-conducting portion, and a separator are laminated in a plate shape, a housing in which the electrode assembly is accommodated inside, a negative electrode terminal installed on one side of the housing, and a positive electrode terminal installed in the housing in a direction opposite to the negative electrode terminal and having a smaller number than the negative electrode terminals.

[0018] In some examples, the electrode assemblies are provided in multiples and are stacked on the inside of the housing and can be directly connected to the positive and negative terminals.

[0019] In some examples, the housing may include a case in which the electrode assembly is housed inside and a cap plate covering an open inlet of the case.

[0020] In some examples, the electrode assembly may include a first electrode assembly having a first cathode-free portion protruding upwardly and positioned on one widthwise side, and a second electrode assembly installed in series with the first electrode assembly and having a second cathode-free portion protruding upwardly and positioned on the other widthwise side.

[0021] In some examples, the first electrode assembly may include a first positive electrode non-conductive portion protruding from the lower side of the first electrode assembly and positioned on both sides in the width direction of the first electrode assembly.

[0022] In some examples, the second electrode assembly may include a second positive electrode non-conductive portion protruding downwardly from the second electrode assembly and positioned on both sides of the second electrode assembly in the width direction.

[0023] In some examples, the first cathode-free portion and the second cathode-free portion may be installed diagonally staggered.

[0024] In some examples, the positive terminal may be directly connected to the positive uncharged portion.

[0025] In some examples, the negative terminal may be directly connected to the negative uncharged portion.

[0026] In some examples, the positive electrode plate may use at least one of LCO, NCM, NCA, LFP, and NMx as the positive electrode active material.

[0027] In some examples, the negative electrode plate may use a mixture of graphite and Si as the negative electrode active material.

[0028] According to the present invention, since the negative electrode non-conductive portions provided in the two electrode assemblies are welded to the two negative electrode terminals respectively, welding resistance is reduced, and heat dissipation is performed quickly and easily, thereby improving the safety of the secondary battery.

[0029] In addition, according to the present invention, since a plurality of stacked electrode assemblies are installed inside one case, the energy density of the secondary battery can be increased.

[0030] However, the effects that can be obtained through the present invention are not limited to the effects described above, and other technical effects that are not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0031] The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0032] Figure 1 is a perspective view illustrating an exemplary secondary battery according to the present invention.

[0033] Figure 2 is an exploded perspective view illustrating an exemplary secondary battery according to the present invention.

[0034] Figure 3 is a cross-sectional view illustrating an exemplary secondary battery according to the present invention.

[0035] Figure 4 is an exploded perspective view of an exemplary electrode assembly according to the present invention.

[0036] FIG. 5 is a perspective view illustrating an exemplary first electrode assembly according to the present invention.

[0037] Figure 6 is a front view illustrating an exemplary first electrode assembly according to the present invention.

[0038] FIG. 7 is a perspective view illustrating an exemplary first positive electrode plate, a first negative electrode plate, and a first separator according to the present invention.

[0039] FIGS. 8A and 8B are perspective views illustrating a battery pack including an exemplary secondary battery according to the present invention.

[0040] FIGS. 9A and 9B are perspective and side views illustrating a vehicle including an exemplary battery pack according to the present invention.

[0041] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms or words used in this specification and claims should not be interpreted as limited to their typical or dictionary meanings, and should be interpreted with meanings and concepts that conform to the technical spirit of the present invention based on the principle that the inventor can appropriately define the concept of a term to best explain his or her own invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as substitutes for them at the time of filing this application.

[0042] Additionally, when used herein, the terms "comprise", "include" and / or "comprising", "including" specify the presence of stated features, numbers, steps, operations, elements, elements and / or groups thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, elements, elements and / or groups thereof.

[0043] Additionally, to facilitate understanding of the invention, the attached drawings may not be drawn to scale and some components may be exaggerated in size. Furthermore, identical components may be assigned the same reference numbers in different embodiments.

[0044] The statement that two compared objects are "identical" means "substantially identical." Therefore, "substantially identical" may include deviations considered low in the art, such as deviations of less than 5%. Furthermore, uniformity of a parameter over a given region may imply uniformity on average.

[0045] Although terms like "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless otherwise specified, a "first" component may also be a "second" component.

[0046] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0047] Any configuration being placed “on top (or bottom)” of a component or “on top (or bottom)” of a component may mean not only that any configuration is placed in contact with the top (or bottom) of the component, but also that other configurations may be interposed between the component and any configuration placed on (or under) the component.

[0048] Additionally, when it is described that a component is “connected,” “coupled,” or “connected” to another component, it should be understood that the components may be directly connected or connected to each other, but that other components may also be “interposed” between the components, or that each component may be “connected,” “coupled,” or “connected” through another component. Furthermore, when it is said that a part is electrically coupled to another part, this includes not only cases where they are directly connected, but also cases where they are connected with another element in between.

[0049] When reference is made throughout the specification to “A and / or B,” this means A, B, or A and B, unless otherwise stated. In other words, “and / or” includes all or any combination of the listed items. When reference is made to “C through D,” this means C or more and D or less, unless otherwise stated.

[0050] The terminology used herein is for the purpose of describing embodiments of the present disclosure and is not intended to be limiting of the present disclosure.

[0051] Fig. 1 is a perspective view illustrating an exemplary secondary battery (1) according to the present invention, Fig. 2 is an exploded perspective view illustrating an exemplary secondary battery (1) according to the present invention, and Fig. 3 is a cross-sectional view illustrating an exemplary secondary battery (1) according to the present invention. As illustrated in Figs. 1 to 3, the secondary battery (1) includes an electrode assembly (10).

[0052] In the present invention, the secondary battery (1) may be referred to as a square secondary battery (1) or battery, the first electrode plate may be referred to as a negative electrode plate, and the second electrode plate may be referred to as a positive electrode plate.

[0053] The electrode assembly (10) can be formed by winding or stacking a laminate of a first electrode plate, a separator, and a second electrode plate formed in a thin plate shape or a film shape. When the electrode assembly (10) is a rolled laminate, the winding axis can be parallel to the width direction (X) of the case (72). In addition, the electrode assembly (10) can be a stack type rather than a rolled type, and the shape of the electrode assembly (10) is not limited in the present invention. In addition, the electrode assembly (10) can be a Z-stack electrode assembly (10) in which a positive electrode plate and a negative electrode plate are inserted on both sides of a separator folded in a Z-stack shape. In addition, the electrode assembly (10) can be stored inside the case (72) by stacking one or more electrode assemblies (10) so that their long sides are adjacent to each other, and the number of electrode assemblies (10) is not limited in the present invention. The first electrode plate of the electrode assembly (10) can serve as a cathode, and the second electrode plate can serve as an anode. Of course, the opposite is also possible.

[0054] The first electrode plate is formed by applying a first electrode active material such as graphite or carbon to a first electrode current collector plate formed of a metal foil such as copper, a copper alloy, nickel, or a nickel alloy, and may include a first electrode tab (or first uncoated region) which is a region where the first electrode active material is not applied. The first electrode tab may be a passage for current flow between the first electrode plate and the first current collector. In some examples, the first electrode tab may be formed by cutting the first electrode plate in advance so as to protrude from one side, and may protrude further from one side than the separator without separate cutting.

[0055] The second electrode plate is formed by coating a second electrode active material such as a transition metal oxide on a second electrode current collector plate formed of a metal foil such as aluminum or an aluminum alloy, and may include a second electrode tab (or second non-coated region) which is a region where the second electrode active material is not coated. The second electrode tab may serve as a passage for current flow between the second electrode plate and the second current collector. In some examples, the second electrode tab may be formed by cutting the second electrode plate in advance so as to protrude toward the other side when manufacturing the second electrode plate, and may protrude further toward the other side than the separator without separate cutting.

[0056] In some examples, the first electrode tab may be located on the left end side of the electrode assembly (10), and the second electrode tab may be located on the right end side of the electrode assembly (10), or may be located on one side in the same direction. Here, left and right are for convenience of explanation based on the secondary battery (1) illustrated in FIG. 1, and their positions may change when the secondary battery (1) rotates left and right or up and down.

[0057] The first electrode tab of the first electrode plate and the second electrode tab of the second electrode plate are respectively positioned at both ends in the vertical direction (Z) or the width direction (X) of the electrode assembly (10) as described above. In some examples, the electrode assembly (10) may be accommodated in a case (72) together with an electrolyte. In addition, the electrode assembly (10) is positioned such that the negative terminal (100) and the positive terminal (80) are respectively welded and connected to the first electrode tab of the first electrode plate and the second electrode tab of the second electrode plate, which are exposed on both sides.

[0058] In the present invention, the negative electrode uncoated portion may be referred to as a first electrode tab, a negative electrode tab, a first negative electrode uncoated portion (58), a second negative electrode uncoated portion (68), or a first uncoated portion, and the positive electrode uncoated portion may be referred to as a second electrode tab, a positive electrode tab, a first positive electrode uncoated portion (54), a second positive electrode uncoated portion (64), or a second uncoated portion.

[0059] The secondary battery (1) according to the present invention stacks a plurality of electrode assemblies (10) in a stack structure, and directly connects the electrode assemblies (10) to a positive terminal (80) and a negative terminal (100). In some examples, in a state where a plurality of electrode assemblies (10) in a stack structure are stacked, only one of the positive or negative electrodes of the electrode assemblies (10) may be directly connected to the terminal. The meaning that the positive electrode of the electrode assembly (10) is directly connected to the positive terminal (80) means that the electrode assembly (10) is electrically connected by being fixed by welding or the like in a state where it is in direct contact with the positive terminal (80).

[0060] A secondary battery (1) according to one embodiment of the present invention includes an electrode assembly (10), a housing (70), a positive terminal (80), and a negative terminal (100). In some examples, the secondary battery (1) may further include an insulating gasket (130).

[0061] The electrode assembly (10) has a stack structure, and a plurality of electrode assemblies (10) can be stacked in an overlapping state. Various modifications are possible, such as stacking the plurality of electrode assemblies (10) in a vertical direction (Z) or in a longitudinal direction (Y). In some examples, the electrode assemblies (10) are provided in two pieces and can be arranged in a row in the longitudinal direction (Y).

[0062] In order to achieve high capacity of a lithium secondary battery (1), a high capacity battery can be realized by using multiple electrode assemblies (10). The shape of the electrode assembly (10) used to manufacture a high capacity battery can be formed into a winding type structure or a stack type structure.

[0063] The electrode assembly (10) used in the conventional secondary battery (1) has a winding structure and a stack structure.

[0064] The electrode assembly (10) of the winding structure can increase the capacity of the cell by increasing the number of times the electrode is wound, but there is a problem that as the number of times the electrode is wound increases, there is a risk of cracks occurring in the electrode plate at the round portion of the electrode assembly (10).

[0065] The electrode assembly (10) having a stack structure can increase the capacity of the cell by increasing the number of electrodes stacked. However, as the number of electrodes stacked in the electrode assembly (10) having a stack structure increases, the number of tabs of the electrodes also increases, and as the number of tabs of the electrodes increases, a problem occurs in which welding between the tabs of the electrodes and the current collector is not performed well, so there is a limit to increasing the capacity of the electrode assembly (10) having a stack structure.

[0066] For this reason, there is a limit to increasing the cell capacity using a single electrode assembly (10), so in the present invention, the cell capacity is increased using multiple electrode assemblies (10).

[0067] In the case of a cell having a structure of two or four electrode assemblies (10), since the direction of the positive electrode non-conductive part and the negative electrode non-conductive part is arranged in one direction, there is a limit to the width of the welded part of the electrode plate non-conductive part, which limits the cell resistance and cell heat dissipation characteristics.

[0068] In the present invention, a lithium secondary battery (1) composed of two stack-type electrode assemblies (10) is manufactured, thereby providing a lithium secondary battery (1) that secures an increase in energy density while also improving cell heat dissipation characteristics.

[0069] An electrode assembly (10) may be accommodated inside a case (72) together with an electrolyte. The electrode assembly (10) may include or be referred to as an electrode group, an electrode body, or a jelly roll. The electrode assembly (10) may include a positive electrode plate, a negative electrode plate, and a separator between the positive electrode plate and the negative electrode plate. The electrode assembly (10) may be variously modified, such as being wound in a cylindrical shape or stacked. The electrode assembly (10) may include a negative electrode plate having a negative electrode non-coated portion and a positive electrode plate having a positive electrode non-coated portion. A plurality of electrode assemblies (10) may be accommodated inside a case (72). The electrode assembly (10) may be configured as a stack-type electrode assembly (10) in which positive electrode plates, separators, and negative electrode plates are alternately stacked. A stack-type electrode assembly (10) is formed by stacking a negative electrode plate having a negative electrode non-conducting portion, a positive electrode plate having a positive electrode non-conducting portion, and a separator in a plate shape. In some examples, a plurality of electrode assemblies (10) are provided and stacked on the inside of a housing (70), and can be directly connected to a positive electrode terminal (80) and a negative electrode terminal (100).

[0070] In the present invention, the electrode assembly (10) may include a first electrode assembly (50) and a second electrode assembly (60). The first electrode assembly (50) includes a first positive electrode plate (52), a first negative electrode plate (56), and a first separator (59). The first positive electrode non-coated portion (54) is provided with a first positive electrode non-coated portion (54) that is not coated with an active material. The first negative electrode non-coated portion (58) is provided with a first negative electrode non-coated portion (58) that is not coated with an active material.

[0071] The second electrode assembly (60) includes a second positive electrode plate (62), a second negative electrode plate (66), and a second separator (69). The second positive electrode non-coated portion (64) is provided with a second positive electrode non-coated portion (64) that is not coated with an active material. The second negative electrode non-coated portion (68) is provided with a second negative electrode non-coated portion (68) that is not coated with an active material.

[0072] In the present invention, the positive electrode plate may include or refer to a first positive electrode plate (52) and a second positive electrode plate (62), the negative electrode plate may include or refer to a first negative electrode plate (56) and a second negative electrode plate (66), and the separator may include or refer to a first separator (59) and a second separator (69). In addition, in the present invention, the positive electrode non-coated portion may include or refer to a first positive electrode non-coated portion (54) and a second positive electrode non-coated portion (64), and the negative electrode non-coated portion may include or refer to a first negative electrode non-coated portion (58) and a second negative electrode non-coated portion (68).

[0073] The housing (70) can be modified in various ways within the technical concept of having the electrode assembly (10) positioned inside. The housing (70) in which the electrode assembly (10) is accommodated inside can be formed of a single member or can be modified in various ways, such as by combining multiple members. The housing (70) according to one embodiment of the present invention includes a case (72) and a cap plate (74).

[0074] The case (72) accommodates the electrode assembly (10) and the electrolyte, and together with the cap plate (74), can form the outer shape of the secondary battery (1). In the present invention, the case (72) may include or be referred to as a case (72), a can, or an outer material. The case (72) accommodates the electrode assembly (10), and can be transformed into various shapes within the technical concept of having a terminal hole on one side and an open inlet on the other side.

[0075] The secondary battery (1) has an open upper portion of the case (72) during the manufacturing process (hereinafter, based on FIG. 2). Therefore, the secondary battery (1) can be inserted with an electrolyte through the open upper portion of the case (72) during the manufacturing process. At this time, the electrolyte and the electrode assembly (10) can be inserted in the direction from the open upper portion of the case (72) toward the bottom. After the electrolyte and the electrode assembly (10) are inserted into the case (72), a cap plate (74) can be coupled to the open upper portion to seal the interior of the case (72). The case (72) can be formed of steel, a steel alloy, aluminum, an aluminum alloy, or an equivalent thereof, but the material thereof is not limited thereto.

[0076] The electrolyte serves to enable the movement of lithium ions between the positive and negative electrode plates constituting the electrode assembly (10). This electrolyte may be a non-aqueous organic electrolyte that is a mixture of a lithium salt and a high-purity organic solvent. In addition, the electrolyte may be a polymer using a polymer electrolyte or a solid electrolyte, and the type of electrolyte is not limited here.

[0077] The cap plate (74) can be modified in various ways within the technical concept of covering the open entrance of the case (72). The cap plate (74) can be coupled to the upper portion of the case (72). In some examples, the cap plate (74) is fixed to the case (72), and a negative terminal (100) can be fixed to the cap plate (74).

[0078] The cap plate (74) may have the same polarity as the negative terminal (100). Alternatively, an insulating gasket (130) may be additionally installed between the cap plate (74) and the negative terminal (100). If the insulating gasket (130) is installed on the cap plate (74), the cap plate (74) and the negative terminal (100) may not be electrically connected and thus may not have the same polarity. If the insulating gasket (130) is installed on the cap plate (74), the cap plate (74) may be neutral.

[0079] The positive terminal (80) can be modified in various ways within the technical concept of being directly connected to the positive electrode non-conductive portion of the electrode assembly (10). When the negative electrode terminal (100) is installed in the cap plate (74), the positive electrode terminal (80) can be installed in the case (72) located in the opposite direction to the negative electrode terminal (100). The positive electrode terminal is electrically connected to the positive electrode non-conductive portion. In some examples, the number of positive electrode terminals (80) may be smaller than the number of negative electrode terminals (100). According to one embodiment of the present invention, the number of positive electrode terminals (80) may be one less than the number of negative electrode terminals (100). The number of negative electrode terminals (100) is the same as the number of electrode assemblies (10). For example, when two electrode assemblies (10) are installed, including a first electrode assembly (50) and a second electrode assembly (60), two negative terminals (100) are also installed, including a first negative terminal (110) and a second negative terminal (120). In addition, when there are two negative terminals (100), there may be one positive terminal (80). In some examples, the positive terminal (80) may include a positive current collector plate (82), a positive rivet (84), and a positive terminal cover (86).

[0080] The positive electrode collector plate (82) is electrically connected to the positive electrode non-coated portion of the electrode assembly (10), and various modifications are possible within the technical concept of being located inside the housing (70). The positive electrode collector plate (82) is located between the positive electrode rivet (84) and the positive electrode non-coated portion. Since the positive electrode collector plate (82) is welded to the positive electrode rivet (84) and the positive electrode non-coated portion, respectively, the positive electrode terminal (80) can be directly connected to the positive electrode non-coated portion. The positive electrode collector plate (82) can be various modifications within the technical concept of being electrically connected to the first positive electrode non-coated portion (54) and the second positive electrode non-coated portion (64). The first positive electrode non-coated portion (54) provided in the first electrode assembly (50) and the second positive electrode non-coated portion (64) provided in the second electrode assembly (60) are directly connected to the positive electrode terminal (80). The positive electrode collector plate (82) can be made of aluminum (Al).

[0081] The positive rivet (84) is electrically connected to the positive collector plate (82) and can be modified in various ways within the technical concept of extending toward the outside of the cap plate (74). One side of the positive rivet (84) is welded to the positive collector plate (82), and the other side of the positive rivet (84) extends toward the outside of the case (72).

[0082] The positive terminal cover (86) is located on the outside of the case (72) and is connected to the positive rivet (84) and can be modified in various ways within the technical concept of transmitting current.

[0083] The positive rivet (84) and the positive terminal cover (86) can be formed as one piece, or various modifications can be implemented, such as two parts being fixed by welding, etc. Only one positive terminal (80) can be installed on the lower surface of the case (72).

[0084] In the secondary battery (1) of the present invention, a plurality of negative terminals (100) are installed, but only one positive terminal (80) is installed. The case (72) in which the positive terminal (80) is installed can be used to accommodate various types of electrode assemblies (10). Therefore, the case (72) can be used to accommodate one electrode assembly (10), and the same case (72) can also be used to accommodate a plurality of electrode assemblies (10).

[0085] For example, since one electrode assembly (10) having a winding structure is provided with one positive tab and one negative tab, two or three or more positive terminals (80) cannot be connected to one positive tab.

[0086] Even in the case of one electrode assembly (10) having a stack structure, since only one positive tab and one negative tab are provided, two or three or more positive terminals (80) cannot be connected to one positive tab.

[0087] As described above, the reason why the positive electrode terminals (80) are not installed in the case (72) in multiple numbers is that the production cost can be reduced by using the case (72) in which the positive electrode terminals (80) are installed in common not only for accommodating multiple electrode assemblies (10) but also for accommodating a single electrode assembly (10).

[0088] The negative terminal (100) is installed on the cap plate (74) in the same number as the electrode assembly (10), and various modifications are possible within the technical concept of being electrically connected to the negative electrode non-conductive portion. The negative terminal (100) can be directly connected to the negative electrode non-conductive portion. The negative terminal (100) can be installed on one side of the housing (70), and the positive terminal (80) can be installed on the other side of the housing (70) opposite to the negative terminal (100). The negative terminal (100) according to one embodiment of the present invention includes a first negative terminal (110) and a second negative terminal (120).

[0089] When two electrode assemblies (10) are installed as a first electrode assembly (50) and a second electrode assembly (60), two negative terminals (100) are installed as a first negative terminal (110) and a second negative terminal (120). The reason why two negative terminals (100) are installed is that when one negative terminal (100) is applied, cell safety and heat dissipation effect cannot be obtained. When three negative terminals (100) are applied, it is difficult to form three or more negative tabs when considering the size of the electrode plate of the electrode assembly (10). However, when three or more electrode assemblies (10) are installed, the negative terminals (100) can also be installed corresponding to the number of electrode assemblies (10).

[0090] The first negative terminal (110) is located on one side (right side in Fig. 3) of the cap plate (74) in the width direction (X) and is electrically connected to the first negative electrode non-conductive portion (58), and various modifications are possible within the technical concept. The first negative terminal (110) according to one embodiment of the present invention includes a first collector plate (112), a first rivet (114), and a first terminal cover (116).

[0091] The first collector plate (112) can be modified in various ways within the technical concept of being electrically connected to the first negative electrode non-conducting portion (58). The first collector plate (112) according to one embodiment of the present invention has a plate shape and is installed between the first rivet (114) and the first negative electrode non-conducting portion (58). The lower side of the first collector plate (112) can be welded to the first negative electrode non-conducting portion (58), and the upper side of the first collector plate (112) can be welded to the first rivet (114).

[0092] The first rivet (114) is electrically connected to the first collector plate (112) and can be modified in various ways within the technical concept of extending toward the outside of the cap plate (74). The first rivet (114) is installed in the vertical direction (Z) and is installed in a shape that penetrates the cap plate (74). The lower side of the first rivet (114) is welded to the first collector plate (112), and the upper side of the first rivet (114) is connected to the first terminal cover (116).

[0093] The first terminal cover (116) is located on the outside of the cap plate (74) and is connected to the first rivet (114) to transmit current, and thus can be modified in various ways within the technical concept. The current of the first negative electrode non-conductive portion (58) moves sequentially through the first collector plate (112) and the first rivet (114) and then is transmitted to the first terminal cover (116).

[0094] The second negative terminal (120) is located on the other side (left side in Fig. 3) of the cap plate (74) in the width direction (X), and various modifications are possible within the technical concept of being electrically connected to the second negative electrode non-conductive portion (68).

[0095] A second negative terminal (120) according to one embodiment of the present invention includes a second collector plate (122), a second rivet (124), and a second terminal cover (126). The structure of the second negative terminal (120) may be identical to or similar to the structure of the first negative terminal (110).

[0096] The second collector plate (122) can be modified in various ways within the technical concept of being electrically connected to the second negative electrode non-conducting portion (68). The second collector plate (122) according to one embodiment of the present invention has a plate shape and is installed between the second rivet (124) and the second negative electrode non-conducting portion (68). The lower side of the second collector plate (122) can be welded to the second negative electrode non-conducting portion (68), and the upper side of the second collector plate (122) can be welded to the second rivet (124).

[0097] The second rivet (124) is electrically connected to the second collector plate (122) and can be modified in various ways within the technical concept of extending toward the outside of the cap plate (74). The second rivet (124) is installed in the vertical direction (Z) and is installed in a shape that penetrates the cap plate (74). The lower side of the second rivet (124) is welded to the second collector plate (122), and the upper side of the second rivet (124) is connected to the second terminal cover (126).

[0098] The second terminal cover (126) is located on the outside of the cap plate (74) and is connected to the second rivet (124) to allow for various modifications within the technical concept of transmitting current. The current of the second negative electrode non-conductive portion (68) moves sequentially through the second collector plate (122) and the second rivet (124) and then is transmitted to the second terminal cover (126).

[0099] An insulating gasket (130) is installed between at least one of the positive terminal (80) and the negative terminal (100) and the housing (70) to perform an insulating function. The insulating gasket may be formed of a resin material such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc. An insulating gasket (130) according to one embodiment of the present invention includes a first gasket (132), a second gasket (134), and a positive gasket (136).

[0100] The first gasket (132) is installed between the first negative terminal (110) and the cap plate (74), thereby blocking the electrical connection between the first negative terminal (110) and the cap plate (74). The first gasket (132) is made of an insulating material and may have elasticity.

[0101] The second gasket (134) is installed between the second negative terminal (120) and the cap plate (74), thereby blocking the electrical connection between the second negative terminal (120) and the cap plate (74). The second gasket (134) is made of an insulating material and may have elasticity.

[0102] The positive electrode gasket (136) is installed between the case (72) and the positive electrode terminal (80), thereby blocking the electrical connection between the positive electrode terminal (80) and the case (72). The positive electrode gasket (136) is made of an insulating material and may have elasticity. The positive electrode gasket (136) blocks contact between the case (72) and the positive electrode terminal (80), thereby electrically isolating the case (72) and the positive electrode terminal (80).

[0103] FIG. 4 is an exploded perspective view of an exemplary electrode assembly (10) according to the present invention, FIG. 5 is a perspective view of an exemplary first electrode assembly (50) according to the present invention, FIG. 6 is a front view of an exemplary first electrode assembly (50) according to the present invention, and FIG. 7 is a perspective view of an exemplary first positive electrode plate (52), a first negative electrode plate (56), and a first separator (59) according to the present invention. As illustrated in FIGS. 4 to 7, the electrode assembly (10) includes a first electrode assembly (50) and a second electrode assembly (60).

[0104] The first electrode assembly (50) includes a first positive electrode plate (52) having a first positive electrode non-conducting portion (54), a first negative electrode plate (56) having a first negative electrode non-conducting portion (58), and a first separator (59). The first negative electrode non-conducting portion (58) protruding upward from the first electrode assembly (50) may be located on one side (right side in Fig. 4) of the first electrode assembly (50) in the width direction (X).

[0105] The first positive electrode plate (52) may include a first positive electrode base material and a positive electrode active material layer positioned on the outer side of the first positive electrode base material. A first positive electrode non-conductive portion (54) of the first positive electrode plate (52) where the positive electrode active material layer is not positioned may extend to the outer side (e.g., the lower side) of the first positive electrode plate (52), and the first positive electrode non-conductive portion (54) may be electrically connected to the positive electrode current collector (82). The first positive electrode plate (52) may use at least one of LCO, NCM, NCA, LFP, and NMx as the positive electrode active material.

[0106] The first positive electrode non-coated portion (54) protrudes downward from the first electrode assembly (50) and may be located on both sides of the width direction (X) of the first electrode assembly (50). In some examples, the number of positive electrode non-coated portions may be twice the number of negative electrode non-coated portions. According to one embodiment of the present invention, two first positive electrode non-coated portions (54) are provided on one first positive electrode plate (52). If only one first positive electrode non-coated portion (54), which is a positive electrode tab, is formed on the first positive electrode plate (52), a part that cannot be welded may occur due to the structure of the stacked electrode assembly. If three first positive electrode non-coated portions (54), which are positive electrode tabs, are formed on the first positive electrode plate (52), there is a problem that welding must be performed three times, which reduces productivity. Therefore, in the present invention, two first positive electrode non-coated portions (54) are installed on one first positive electrode plate (52). The first anode-free portion (54) has a square protrusion shape, and two of them protrude from the lower side (based on Fig. 5) of the first anode plate (52). The first anode-free portions (54) are located on both sides in the width direction (X) and are installed spaced apart from each other.

[0107] The first negative electrode plate (56) may include a first negative electrode substrate and a negative electrode active material layer positioned on the outer side of the first negative electrode substrate. A first negative electrode non-conductive portion (58) of the first negative electrode plate (56) where the negative electrode active material layer is not positioned may extend to the outer side of the first negative electrode plate (56) (e.g., the upper side based on FIG. 5), and the first negative electrode non-conductive portion (58) may be electrically connected to the first current collector plate (112).

[0108] The first positive electrode plate (52) may be composed of, for example, aluminum foil, and the positive electrode active material layer may include, for example, a transition metal oxide. The first negative electrode plate (56) may be composed of, for example, copper foil or nickel foil, and the negative electrode active material layer may include, for example, graphite and / or silicon. The negative electrode plates including the first negative electrode plate (56) and the second negative electrode plate (66) may use a mixture of graphite and Si as the negative electrode active material.

[0109] The first electrode assembly (50) and the second electrode assembly (60) are installed laterally and in succession, and the first negative electrode uncoated portion (58) and the second negative electrode uncoated portion (68) are installed diagonally. Accordingly, the first negative electrode uncoated portion (58) is directly connected to the first negative terminal (110), and the second negative electrode uncoated portion (68) is directly connected to the second negative terminal (120). When the first negative electrode uncoated portion (58) and the second negative electrode uncoated portion (68) provided in the stacked first electrode assembly (50) and the second electrode assembly (60) are installed in two pieces each, the distance between the first negative electrode uncoated portion (58) and the second negative electrode uncoated portion (68) is formed narrowly and installed in an overlapping state. Therefore, when two or more negative electrode non-conductive parts are installed on the negative electrode plate, there is no reason for two negative electrode terminals (100) to be formed on the outside of the housing (70) since the negative electrode non-conductive parts are welded in a parallel manner.

[0110] The secondary battery (1) according to the present invention has two electrode assemblies (10) inside, and a high-capacity secondary battery (1) can be provided through the configuration of the two electrode assemblies (10). In addition, since the negative electrodes of the two electrode assemblies (10) are independently welded to the two negative terminals (100), the same effect as if the two electrode assemblies (10) operate separately can be achieved. In order to achieve the same effect as if the two electrode assemblies (10) operate separately, the negative electrode non-coated portions, which are negative electrode tabs, are stacked so that they are located only on one side or the other side in the width direction (X). In addition, the first negative electrode non-coated portion (58) and the second negative electrode non-coated portion (68) provided in the adjacent electrode assemblies (10) are located in a diagonal direction.

[0111] When welding two electrode assemblies (10) that have a stack structure and are laminated, the possibility of defects occurring during the welding process increases. Therefore, in order to reduce welding defects, the protrusion directions of the positive electrode non-coated portion and the negative electrode non-coated portion are made opposite. For example, the positive electrode non-coated portion may protrude downward, and the negative electrode non-coated portion may protrude upward. In addition, since the first negative electrode non-coated portion (58) and the second negative electrode non-coated portion (68) that constitute the negative electrode non-coated portion are positioned diagonally, the welding work can be performed more easily, and the welding resistance can be reduced. In addition, although it is disadvantageous in terms of heat dissipation when the thickness of the electrode assembly (10) increases, since the structures of the positive electrode non-coated portion and the negative electrode non-coated portion are separated, an effect can also be obtained in the heat dissipation characteristics of the secondary battery (1).

[0112] The first separator (59) can prevent short circuiting between the first positive electrode plate (52) and the first negative electrode plate (56) while allowing movement of lithium ions. In some examples, the first separator (59) can be located on opposite sides of the first positive electrode plate (52), or on opposite sides of the first negative electrode plate (56).

[0113] The second electrode assembly (60) is installed in series with the first electrode assembly (50), and the second negative electrode non-conducting portion (68) protruding upward is located on the other side in the width direction (X) (left side in Fig. 4). The structure of the second electrode assembly (60) is similar or identical to that of the first electrode assembly (50), and only the positions of the first negative electrode non-conducting portion (58) and the second negative electrode non-conducting portion (68) are different. The second electrode assembly (60) according to one embodiment of the present invention includes a second positive electrode plate (62), a second negative electrode plate (66), and a second separator (69).

[0114] The second positive electrode non-coated portion (64) provided on the second positive electrode plate (62) protrudes downward from the second electrode assembly (60) and is located on both sides in the width direction (X) of the second electrode assembly (60). In some examples, the number of positive electrode non-coated portions may be greater than the number of negative electrode non-coated portions. Accordingly, the number of first positive electrode non-coated portions (54) is greater than the number of first negative electrode non-coated portions (58). In addition, the number of second positive electrode non-coated portions (64) is greater than the number of second negative electrode non-coated portions (68).

[0115] The second negative electrode plate (66) is laminated in a shape facing the second positive electrode plate (62) with the second separator (69) interposed therebetween. The first negative electrode non-conductive portion (58) and the second negative electrode non-conductive portion (68) may be installed diagonally alternately.

[0116] The first negative electrode non-coated portion (58) and the second negative electrode non-coated portion (68) have a structure in which they are positioned diagonally opposite each other. In addition, the first negative electrode non-coated portion (58) is directly welded to the first negative terminal (110), and the second negative electrode non-coated portion (68) is directly welded to the second negative terminal (120), so that the welding resistance is reduced and the heat dissipation of the secondary battery (1) is quickly achieved, thereby improving the safety of the secondary battery (1).

[0117] Since the secondary battery (1) has a stack-type first electrode assembly (50) and a second electrode assembly (60), the energy density of the lithium secondary battery (1) can be increased.

[0118] The electrode assembly (10) is further described below.

[0119] In some examples, a compound capable of reversible intercalation and deintercalation of lithium (a lithiated intercalation compound) may be used as the cathode active material. Specifically, one or more of a composite oxide of lithium and a metal selected from the group consisting of cobalt, manganese, nickel, and combinations thereof may be used.

[0120] The above composite oxide may be a lithium transition metal composite oxide, and specific examples thereof include lithium nickel-based oxide, lithium cobalt-based oxide, lithium manganese-based oxide, lithium iron phosphate-based compound, cobalt-free nickel-manganese-based oxide, or a combination thereof.

[0121] As an example, a compound represented by any one of the following chemical formulas may be used.

[0122] Li a A 1-b X b O 2-c D c (0.90≤a≤1.8, 0≤b≤0.5, 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, 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, 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, 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, 0≤e≤0.1); Li a NiG b O2(0.90≤a≤1.8, 0.001≤b≤0.1); Li a CoG b O2(0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-b G bO2(0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn2G b O4(0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-g G g PO4(0.90≤a≤1.8, 0≤g≤0.5); Li (3-f) Fe2(PO4)3(0≤f≤2); Li a FePO4(0.90≤a≤1.8).

[0123] In the above chemical formula, A is Ni, Co, Mn, or a combination thereof; X is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element, or a combination thereof; D is O, F, S, P, or a combination thereof; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof; L 1 is Mn, Al or a combination thereof.

[0124] A positive electrode for a lithium secondary battery (1) may include a current collector (e.g., a first substrate) 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.

[0125] The content of the positive electrode active material may be 90 wt% to 99.5 wt% with respect to 100 wt% of the positive electrode active material layer, and the contents of the binder and conductive material may be 0.5 wt% to 5 wt%, respectively, with respect to 100 wt% of the positive electrode active material layer.

[0126] Aluminum may be used as the current collector, but is not limited thereto.

[0127] The negative electrode active material includes a material capable of reversibly intercalating / deintercalating lithium ions, lithium metal, an alloy of lithium metal, a material capable of doping and dedoping lithium, or a transition metal oxide.

[0128] The material capable of reversibly intercalating / deintercalating the lithium ions may include a carbon-based negative electrode active material, for example, crystalline carbon, amorphous carbon, or a combination thereof. Examples of the crystalline carbon include graphite such as natural graphite or artificial graphite, and examples of the amorphous carbon include soft carbon or hard carbon, mesophase pitch carbide, calcined coke, and the like.

[0129] As the material capable of doping and dedoping the lithium, a Si-based negative electrode active material or a Sn-based negative electrode active material can be used. The Si-based negative electrode active material can be silicon, a silicon-carbon composite, SiOx (0 < x < 2), a Si-based alloy, or a combination thereof.

[0130] The above silicon-carbon composite may be a composite of silicon and amorphous carbon. According to one embodiment, the silicon-carbon composite may be in the form of silicon particles and amorphous carbon coated on the surface of the silicon particles.

[0131] The silicon-carbon composite may further comprise crystalline carbon. For example, the silicon-carbon composite may comprise a core comprising crystalline carbon and silicon particles and an amorphous carbon coating layer positioned on the surface of the core.

[0132] A negative electrode for a lithium secondary battery (1) may include a current collector (e.g., a second substrate) 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.

[0133] For example, the negative electrode active material layer may include 90 to 99 wt% of the negative electrode active material, 0.5 to 5 wt% of the binder, and 0 to 5 wt% of the conductive material.

[0134] The above binder may be a non-aqueous binder, an aqueous binder, a dry binder, or a combination thereof. When an aqueous binder is used as the negative electrode binder, a cellulose-based compound capable of imparting viscosity may be further included.

[0135] The current collector may be selected from copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, a polymer substrate coated with a conductive metal, and a combination thereof.

[0136] The electrolyte for a lithium secondary battery (1) may include a non-aqueous organic solvent and a lithium salt.

[0137] The above non-aqueous organic solvent acts as a medium through which ions involved in the electrochemical reaction of the battery can move.

[0138] The above non-aqueous organic solvent may be a carbonate-based, ester-based, ether-based, ketone-based, or alcohol-based solvent, an aprotic solvent, or a combination thereof, and may be used alone or in combination of two or more thereof.

[0139] Additionally, when using a carbonate solvent, a mixture of cyclic carbonate and chain carbonate can be used.

[0140] As described above, the lithium secondary battery (1) may have a separator between the positive electrode and the negative electrode. As such a separator, a multilayer film of polyethylene, polypropylene, polyvinylidene fluoride, or two or more layers thereof may be used.

[0141] The above separator may include a porous substrate and a coating layer comprising an organic material, an inorganic material, or a combination thereof, positioned on one or both sides of the porous substrate.

[0142] The above organic material may include a polyvinylidene fluoride-based antibody or a (meth)acrylic polymer.

[0143] The above inorganic materials are Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, It may include inorganic particles selected from, but not limited to, SrTiO3, BaTiO3, Mg(OH)2, boehmite, and combinations thereof.

[0144] The organic and inorganic substances may be mixed and present in one coating layer, or a coating layer including an organic substance and a coating layer including an inorganic substance may be present in a laminated form.

[0145] The battery according to the above-described embodiment can be used to manufacture a battery pack.

[0146] FIGS. 8A and 8B are perspective views illustrating a battery pack including an exemplary secondary battery (1) according to the present invention. Referring to FIGS. 8A and 8B, the battery pack (300) may include a plurality of battery modules (200) and a housing (310) for accommodating the plurality of battery modules (200). For example, the housing (310) may include first and second housings (311, 312) that are coupled in a direction facing each other with the plurality of battery modules (200) interposed therebetween. The plurality of battery modules (210) may be electrically connected to each other using a bus bar (251), and the plurality of battery modules (200) may be electrically connected to each other in a series / parallel or series-parallel hybrid manner to obtain a required electrical output. In the drawings, for convenience of illustration, components such as a bus bar, a cooling unit, and an external terminal for electrically connecting battery cells are omitted. In some examples, the battery pack (300) may be mounted on a vehicle. A vehicle may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle. A vehicle may include a four-wheeled vehicle or a two-wheeled vehicle.

[0147] FIGS. 9A and 9B are perspective and side views illustrating an automobile (400, 500) including an exemplary battery pack (300) according to the present invention. In FIG. 9A, the battery pack (300) may include a battery pack cover (311) (which may correspond to the first housing) which is a part of a vehicle underbody (410) and a pack frame (312) (which may correspond to the second housing) which is disposed at a lower portion of the vehicle underbody (410). The battery pack cover (311) and the pack frame (312) may be formed integrally with the vehicle floor (420). The vehicle underbody (410) separates the interior and exterior of the vehicle, and the pack frame (312) may be disposed at the exterior of the vehicle.

[0148] As illustrated in FIG. 9b, the vehicle (500) may be formed by combining additional components, such as a hood (510) at the front of the vehicle and fenders (520) positioned at the front and rear of the vehicle, respectively, with the vehicle body (400). The vehicle (500) includes a battery pack (300) including a battery pack cover (311) and a pack frame (312), and the battery pack (300) may be combined with the vehicle body component (400).

[0149] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical idea of ​​the present invention and the equivalent scope of the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

Claims

1. A plurality of electrode assemblies including a negative electrode plate having a negative electrode non-conducting portion and a positive electrode plate having a positive electrode non-conducting portion; A case in which the electrode assembly is accommodated inside; A cap plate covering the open entrance of the above case; A negative terminal installed on the cap plate in the same number as the above electrode assembly and electrically connected to the negative electrode non-conductive part; and A positive terminal is installed in the case in a direction opposite to the negative terminal and is electrically connected to the positive uncharged portion; A secondary battery characterized in that the number of the positive electrode non-conducting portions is greater than the number of the negative electrode non-conducting portions.

2. In paragraph 1, A secondary battery characterized in that the electrode assembly is formed as a stack-type electrode assembly in which the positive electrode plate, the separator, and the negative electrode plate are alternately stacked.

3. In paragraph 2, The above electrode assembly comprises: a first electrode assembly having a first cathode-free portion protruding upwardly and positioned on one side in the width direction; and A secondary battery comprising a second electrode assembly, which is installed in series with the first electrode assembly and has a second negative electrode non-conductive portion protruding upward and positioned on the other side in the width direction.

4. In paragraph 3, A secondary battery characterized in that the first electrode assembly includes a first positive electrode non-conductive portion protruding downward from the first electrode assembly and positioned on both sides in the width direction of the first electrode assembly.

5. In paragraph 4, A secondary battery characterized in that the second electrode assembly includes a second positive electrode non-conductive portion protruding downward from the second electrode assembly and positioned on both sides in the width direction of the second electrode assembly.

6. In paragraph 5, The above positive electrode terminal comprises: a positive electrode collector plate electrically connected to the first positive electrode non-conductive portion and the second positive electrode non-conductive portion; an anode rivet electrically connected to the anode collector plate and extending toward the outside of the cap plate; and A secondary battery including a positive terminal cover located on the outside of the case and connected to the positive rivet to transmit current.

7. In paragraph 3, The negative terminal is a first negative terminal located on one side of the width direction of the cap plate and electrically connected to the first negative electrode non-conductive part; and A secondary battery comprising a second negative terminal located on the other side of the width direction of the cap plate and electrically connected to the second negative electrode non-conductive portion.

8. In paragraph 7, The first negative terminal comprises a first collector plate electrically connected to the first negative electrode non-conductive part; a first rivet electrically connected to the first collector plate and extending toward the outside of the cap plate; and A secondary battery comprising a first terminal cover located on the outside of the cap plate and connected to the first rivet to transmit current.

9. In paragraph 7, The second negative terminal is a second collector plate electrically connected to the second negative electrode non-conductive part; a second rivet electrically connected to the second collector plate and extending toward the outside of the cap plate; and A secondary battery including a second terminal cover located on the outside of the cap plate and connected to the second rivet to transmit current.

10. In paragraph 1, A secondary battery characterized in that the number of the positive electrode non-conducting portions is twice the number of the negative electrode non-conducting portions.

11. An electrode assembly in which a negative electrode plate having a negative electrode non-conducting portion, a positive electrode plate having a positive electrode non-conducting portion, and a separator are laminated in a plate shape; A housing in which the electrode assembly is accommodated inside; A negative terminal installed on one side of the housing; and A positive terminal is installed in the housing in a direction opposite to the negative terminal, and is comprised of a smaller number of positive terminals than the negative terminals; A secondary battery characterized in that the electrode assembly is provided in multiple numbers and is stacked on the inside of the housing and is directly connected to the positive terminal and the negative terminal.

12. In paragraph 11, The housing comprises a case in which the electrode assembly is accommodated inside; and A secondary battery comprising a cap plate covering an open inlet of the case.

13. In paragraph 11, The above electrode assembly comprises: a first electrode assembly having a first cathode-free portion protruding upwardly and positioned on one side in the width direction; and A secondary battery comprising a second electrode assembly, which is installed in series with the first electrode assembly and has a second negative electrode non-conductive portion protruding upward and positioned on the other side in the width direction.

14. In paragraph 13, A secondary battery characterized in that the first electrode assembly includes a first positive electrode non-conductive portion protruding downward from the first electrode assembly and positioned on both sides in the width direction of the first electrode assembly.

15. In paragraph 13, A secondary battery characterized in that the second electrode assembly includes a second positive electrode non-conductive portion protruding downward from the second electrode assembly and positioned on both sides in the width direction of the second electrode assembly.

16. In paragraph 13, A secondary battery characterized in that the first negative electrode non-conductive portion and the second negative electrode non-conductive portion are installed diagonally alternately.

17. In paragraph 11, A secondary battery characterized in that the positive electrode terminal is directly connected to the positive electrode non-conductive portion.

18. In paragraph 11, A secondary battery characterized in that the negative terminal is directly connected to the negative electrode non-conductive portion.

19. In paragraph 11, A secondary battery characterized in that the above positive electrode plate uses at least one of LCO, NCM, NCA, LFP, and NMx as a positive electrode active material.

20. In paragraph 11, The above negative electrode plate is a secondary battery characterized in that it uses graphite and Si as a negative electrode active material.

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