Secondary battery having venting part

Abstract

To provide a square secondary battery capable of effectively coping with damage and deterioration of an electrode terminal caused by ejection of internal gas due to breakage or opening of a venting part provided in the secondary battery.SOLUTION: A prismatic secondary battery includes a battery case having a hexahedral shape, a positive electrode terminal and a negative electrode terminal disposed on any one surface or any two surfaces of six surfaces of the battery case, a venting portion provided on the same surface as at least one electrode terminal of the positive electrode terminal and the negative electrode terminal, and a terminal structure body electrically connected to the electrode terminal disposed on the same surface as the venting portion and including an extension terminal exposed on any one surface other than the surface provided with the venting portion.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a secondary battery having a vent, and more particularly to a prismatic secondary battery having a hexahedral shape.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0018633, filed on February 14, 2022, and all contents disclosed in the documents of said Korean patent application are incorporated herein by reference. [Background technology]

[0003] Unlike primary batteries, secondary batteries can be recharged, and they have the potential to be small and have large capacities, so they have been the subject of much research and development in recent years. Demand for secondary batteries as an energy source is rapidly increasing due to the increasing technological development and demand for mobile devices, as well as the emergence of electric vehicles and energy storage systems in response to modern demands for environmental protection.

[0004] Secondary batteries are classified into coin-type batteries, cylindrical batteries, prismatic batteries, and pouch-type batteries depending on the shape of the battery case. The electrode assembly installed inside the battery case of a secondary battery is a power generating element that can be charged and discharged and is made up of a laminated structure of electrodes and a separator.

[0005] Electrode assemblies can be broadly classified into a jellyroll type in which a sheet-like positive electrode and negative electrode coated with an active material are wound up with a separator interposed between them; a stack type in which multiple positive electrodes and negative electrodes are stacked in sequence with a separator interposed between them; and a stack and folding type in which stack type unit cells are wound up with a long separator film.

[0006] Among various types of secondary batteries, prismatic secondary batteries are generally characterized by having positive and negative terminals disposed together on one side or one on each side on opposite sides. Also, vents provided for the safety of the secondary battery are generally disposed between the positive and negative terminals disposed together on one side or next to the electrode terminals on both sides on opposite sides.

[0007] While the venting structure does not pose any particular problems when the secondary battery is operating normally, if the internal pressure of the secondary battery increases abnormally and the vent breaks, releasing gas, it could damage the adjacent electrode terminals. If the vent breaks and the internal gas escapes, the positive and negative terminals could be damaged, including corroded and ignited. Damage to the electrode terminals could lead to electrical problems, potentially affecting more than just the secondary battery. If the terminals are located near the electronic circuits of the module / pack, there is an increased risk of an explosion due to malfunction of the electronic circuits during venting. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Korean Patent Publication No. 10-2019-0102816 Summary of the Invention [Problem to be solved by the invention]

[0009] An object of the present invention is to provide a prismatic secondary battery that can effectively deal with damage and deterioration of electrode terminals caused by the release of internal gas due to the rupture or opening of a vent provided in the secondary battery.

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

[0011] In one example, a prismatic secondary battery according to the present invention includes a hexahedral battery case; a positive electrode terminal and a negative electrode terminal disposed on both or any two of six sides of the battery case; a vent provided on the same side as at least one of the positive electrode terminal and the negative electrode terminal; and a terminal structure including an extension terminal electrically connected to the electrode terminal disposed on the same side as the vent and exposed on any one side excluding the side on which the vent is provided.

[0012] In one embodiment of the present invention, the terminal structure includes a terminal body that is coupled to one or more surfaces of the battery case while enclosing the electrode terminal so that it is not exposed, and the extension terminal.

[0013] The extension wires electrically connecting the extension terminals to the electrode terminals are not exposed to the outside of the terminal body.

[0014] The extension wiring electrically connecting the extension terminal to the electrode terminal is insulated from the outside.

[0015] In an embodiment of the present invention, the positive electrode terminal, the negative electrode terminal, and the venting portion are disposed together on an upper surface of the battery case, and a pair of terminal structures are electrically connected to the positive electrode terminal and the negative electrode terminal, respectively, and the extension terminals may be exposed on both side surfaces of the battery case located opposite to each other.

[0016] Alternatively, the positive electrode terminal, the negative electrode terminal, and the venting portion may be disposed together on the upper surface of the battery case, and a pair of terminal structures may be electrically connected to the positive electrode terminal and the negative electrode terminal, respectively, and the extension terminals may be exposed on the front or rear surfaces of the battery case, which are located on opposite sides of the battery case.

[0017] Here, the pair of extension terminals of the terminal structure may be disposed together on either the front or rear surface of the battery case, or one each on the front and rear surfaces of the battery case.

[0018] The positive terminal, the negative terminal, and the venting portion may be disposed together on the upper surface of the battery case, and a pair of terminal structures may be electrically connected to the positive terminal and the negative terminal, respectively, and the extension terminals may be exposed on either one of both side surfaces and either one of the front and rear surfaces located on opposite sides of the battery case.

[0019] Alternatively, the positive electrode terminal, the negative electrode terminal, and the venting portion may be disposed together on the upper surface of the battery case, and a pair of terminal structures may be electrically connected to the positive electrode terminal and the negative electrode terminal, respectively, and the extension terminals may be exposed on the bottom surface of the battery case.

[0020] Meanwhile, according to another embodiment of the present invention, the positive and negative electrode terminals may be disposed on both side surfaces of the battery case, the venting portion may be disposed on at least one of both side surfaces of the battery case, a pair of terminal structures may be electrically connected to the positive and negative electrode terminals, respectively, and the extension terminals may be exposed on an upper surface of the battery case.

[0021] Alternatively, the positive and negative electrode terminals may be disposed on both side surfaces of the battery case, the venting portion may be disposed on at least one of the both side surfaces of the battery case, a pair of terminal structures may be electrically connected to the positive and negative electrode terminals, respectively, and the extension terminals may be exposed on the front or rear surface of the battery case.

[0022] Here, the pair of extension terminals of the terminal structure may be disposed together on either the front or rear surface of the battery case, or one each on the front and rear surfaces of the battery case.

[0023] The positive and negative terminals may be disposed on both side surfaces of the battery case, the venting portion may be disposed on at least one of the both side surfaces of the battery case, a pair of terminal structures may be electrically connected to the positive and negative terminals, respectively, and the extension terminals may be exposed on one of the top surface and the front and rear surfaces of the battery case.

[0024] Alternatively, the positive and negative electrode terminals may be disposed on both side surfaces of the battery case, the venting portion may be disposed on at least one of the both side surfaces of the battery case, a pair of terminal structures may be electrically connected to the positive and negative electrode terminals, respectively, and the extension terminals may be exposed at a bottom surface of the battery case. [Effects of the Invention]

[0025] In the prismatic secondary battery of the present invention having the above-described configuration, even if the electrode terminal and the vent are disposed on the same surface of the battery case, the electrode terminal can be disposed on a physically different surface from the vent by applying a terminal structure. Therefore, the position of the electrode terminal can be freely changed without changing the internal structure of the existing prismatic secondary battery, thereby reducing the development and production costs of the prismatic secondary battery.

[0026] Furthermore, the position of the electrode terminals of the prismatic secondary batteries can be easily changed, which allows for a high degree of freedom in the design of the battery module and pack.

[0027] However, the technical effects that can be obtained by the present invention are not limited to the effects described above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the invention described below.

[0028] 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 concept of the present invention, and therefore the present invention should not be interpreted as being limited solely to the matters depicted in such drawings. [Brief explanation of the drawings]

[0029] [Figure 1] 1 is a diagram illustrating an example of a unidirectional prismatic secondary battery. [Figure 2] 1A and 1B are diagrams illustrating various examples of a prismatic secondary battery according to a first embodiment of the present invention; [Figure 3] 1A and 1B are diagrams illustrating various examples of a prismatic secondary battery according to a first embodiment of the present invention; [Figure 4] 1A and 1B are diagrams illustrating various examples of a prismatic secondary battery according to a first embodiment of the present invention; [Figure 5] 1A and 1B are diagrams illustrating various examples of a prismatic secondary battery according to a first embodiment of the present invention; [Figure 6] 1A and 1B are diagrams illustrating various examples of a prismatic secondary battery according to a first embodiment of the present invention; [Figure 7] 1 is a diagram illustrating an example of a bidirectional prismatic secondary battery; [Figure 8] 5A and 5B are diagrams illustrating various examples of a prismatic secondary battery according to a second embodiment of the present invention; [Figure 9] 5A and 5B are diagrams illustrating various examples of a prismatic secondary battery according to a second embodiment of the present invention; [Figure 10] 5A and 5B are diagrams illustrating various examples of a prismatic secondary battery according to a second embodiment of the present invention; [Figure 11] 5A and 5B are diagrams illustrating various examples of a prismatic secondary battery according to a second embodiment of the present invention; [Figure 12] 5A and 5B are diagrams illustrating various examples of a prismatic secondary battery according to a second embodiment of the present invention; [Figure 13] 10A and 10B are diagrams illustrating various examples of a prismatic secondary battery according to a third embodiment of the present invention; [Figure 14]10A and 10B are diagrams illustrating various examples of a prismatic secondary battery according to a third embodiment of the present invention; [Figure 15] 10A and 10B are diagrams illustrating various examples of a prismatic secondary battery according to a third embodiment of the present invention; [Figure 16] 10A and 10B are diagrams illustrating various examples of a prismatic secondary battery according to a third embodiment of the present invention; [Figure 17] 10A and 10B are diagrams illustrating various examples of a prismatic secondary battery according to a third embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0030] Because the present invention is susceptible to various modifications and can have various embodiments, specific embodiments will be described in detail below.

[0031] However, this is not intended to limit the invention to any particular embodiment, but should be understood to include all modifications, equivalents, or alternatives falling within the spirit and scope of the invention.

[0032] In the present invention, the terms "comprise" and "have" are intended to specify the presence of features, numbers, steps, operations, components, parts or combinations thereof described in the specification, and should be understood as not precluding the presence or possibility of addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0033] Furthermore, in the present invention, when a layer, film, region, plate, or other portion is described as being "on" another portion, this includes not only the case where it is "directly on" the other portion, but also the case where there is another portion therebetween. Conversely, when a layer, film, region, plate, or other portion is described as being "under" the other portion, this includes not only the case where it is "directly under" the other portion, but also the case where there is another portion therebetween. Furthermore, in this application, being "located on" can include not only the case where it is located at the top, but also the case where it is located at the bottom.

[0034] The present invention relates to a prismatic secondary battery, particularly a prismatic secondary battery having six flat surfaces forming a hexahedron, and includes a positive electrode terminal and a negative electrode terminal disposed together on any one or any two of the six surfaces of a battery case, a vent provided on the same surface as at least one of the positive electrode terminal and the negative electrode terminal, and a terminal structure including an extension terminal electrically connected to the electrode terminal disposed on the same surface as the vent and exposed on any one surface excluding the surface having the vent.

[0035] Although the prismatic secondary battery according to an embodiment of the present invention is designed and manufactured with the electrode terminals and vents disposed on the same surface, a terminal structure may be applied to separate the electrode terminals from the vents on a different physical surface. This allows the electrode terminals to be freely positioned without changing the internal structure of the existing prismatic secondary battery, thereby reducing the development and production costs of the prismatic secondary battery.

[0036] Furthermore, in the prismatic secondary battery according to one embodiment of the present invention, the positions of the electrode terminals can be freely determined in consideration of the positions of the vents. This allows for easy setting of the safest direction of diffusion of gas or flames ejected from the vents when designing a battery module or pack, while also ensuring a high degree of freedom in optimally determining the positions of the electrode terminals.

[0037] Hereinafter, specific embodiments of the prismatic secondary battery of the present invention will be described with reference to the accompanying drawings. Terms specifying relative positions, such as front, back, left, right, top, bottom, etc., used in the description of each embodiment are used only to facilitate understanding of the invention, and unless otherwise specified, they are based on the directions shown in the drawings.

[0038] (First embodiment) 1 is a diagram illustrating an example of a prismatic secondary battery 100 to which the first embodiment of the present invention can be applied. The prismatic secondary battery 100 of FIG. 1 corresponds to a one-way secondary battery in which electrode terminals 120 including a positive terminal 122 and a negative terminal 124 are both disposed on the top surface of a battery case 110.

[0039] A venting portion 130 is also disposed on the top surface of the battery case 110. In the illustrated example, the venting portion 130 is located between the positive electrode terminal 122 and the negative electrode terminal 124. The venting portion 130 corresponds to a safety device that releases gas when the internal pressure of the prismatic secondary battery 100 increases above a certain level. For example, the venting portion 130 may be notched to have a thinner thickness than the surrounding area, thereby making the venting portion 130 structurally weaker than the surrounding area. As a result, if an abnormality occurs in the prismatic secondary battery 100 and the internal pressure increases above a certain level, the venting portion 130 breaks first, allowing gas generated inside the prismatic secondary battery 100 to be released.

[0040] However, if the venting portion 130 and the electrode terminal 120 are located on the same surface of the battery case 110, there is a high possibility that the electrode terminal 120 will be damaged, such as corroded or ignited, when the venting portion 130 breaks and the internal gas escapes in an emergency. The present invention aims to solve this problem by providing a terminal structure 200.

[0041] 2 is a perspective view illustrating the connection structure between the prismatic secondary battery 100 and the terminal structure 200. The terminal structure 200 is a hinge-shaped structure that connects two or more adjacent surfaces of the battery case 110, and includes a terminal body 210 and an extension terminal 220.

[0042] The terminal body 210 refers to the main body of the terminal structure 200 that is tightly coupled to two adjacent surfaces of the battery case 110 while enclosing the electrode terminals 120, i.e., the positive terminal 122 and the negative terminal 124, so that they are not exposed. For example, in the embodiment of FIG. 2 , the terminal body 210 is configured to enclose the front, rear, and side surfaces adjacent to the top surface of the battery case 110, and the terminal structure 200 is fixed to the battery case 110 by coupling (e.g., bonding or joining) the terminal body 210 to the battery case 110.

[0043] The extension terminal 220 is electrically connected to the electrode terminal 120 and is a connection terminal exposed on one side of the terminal body 210. That is, since the positive electrode terminal 122 and the negative electrode terminal 124 are enclosed by the terminal body 210 and not exposed, the extension terminal 220 functions as a new electrode terminal 120 that has been moved to another side other than the top side where the venting portion 130 is located, for example, to the side of the battery case 110 in the embodiment of FIG.

[0044] As described above, the prismatic secondary battery 100 according to an embodiment of the present invention, including the terminal structure 200, can physically separate the position of the electrode terminal 120 disposed on the upper surface of the battery case 110 from the venting portion 130 without any additional design changes, simply by applying the terminal structure 200. Therefore, the present invention can freely change the position of the electrode terminal 120 and separate it from the venting portion 130 without changing the internal structure of the existing prismatic secondary battery 100, thereby reducing the development time and production costs of the prismatic secondary battery 100.

[0045] The electrode terminal 120 and the extension terminal 220 are electrically connected via the extension wire 230, which is not exposed to the outside of the terminal body 210. The extension wire 230 is insulated from the outside. For example, the extension wire 230 and the extension terminal 220 may be embedded in the terminal body 210 made of an insulating resin material by insert molding, etc. This prevents problems such as damage to the extension wire 230 or an electrical short circuit, which would occur if only the extension terminal 220 were exposed to the outside. For reference, the extension wire 230 and the extension terminal 220 may be configured as an integrated unit or as separate components connected to the terminal body 210.

[0046] Referring again to the embodiment of FIG. 2, the positive electrode terminal 122 and the negative electrode terminal 124, which were disposed adjacent to the venting portion 130 on the top surface of the battery case 110, have been moved to both sides by a pair of terminal structures 200. That is, in FIG. 2, the extension terminal 220 of the terminal structure 200 is exposed on the side surface of the battery case 110. As a result, the embodiment of FIG. 2 also results in converting a unidirectional secondary battery, in which the positive electrode terminal 122 and the negative electrode terminal 124 are both disposed on the top surface of the battery case 110, into a bidirectional secondary battery.

[0047] In addition to the embodiment of FIG. 2, various embodiments are possible in which the electrode terminal 120 is separated from the venting portion 130, and such modifications are illustrated in FIGS.

[0048] 3 shows an embodiment in which a pair of extension terminals 220 of the terminal structure 200 are disposed together on the front surface of the battery case 110. Of course, an embodiment in which a pair of extension terminals 220 are disposed on the rear surface of the battery case 110, which is opposite to the front surface, i.e., an embodiment symmetrical to FIG. 3, is also possible.

[0049] 4 illustrates an embodiment in which a pair of extension terminals 220 of the terminal structure 200 are separately disposed, one on each of the front and rear surfaces of the battery case 110. FIG. 5 illustrates an embodiment in which one of the pair of extension terminals 220 is exposed on one of the opposite side surfaces of the battery case 110, and the other is exposed on one of the front and rear surfaces.

[0050] In this way, by designing the specifications of the terminal structure 200 in a variety of ways, the arrangement of the positive terminal 122 and the negative terminal 124 can be changed in a variety of ways, which allows for a high degree of freedom in the design of electrical wiring such as bus bars when constructing a battery module or pack.

[0051] 6 illustrates an embodiment in which the extension terminal 220 of a pair of terminal structures 200 in a prismatic secondary battery 100 in which the positive electrode terminal 122, the negative electrode terminal 124, and the venting portion 130 are all located on the top surface of the battery case 110 is moved to the bottom surface of the battery case 110. That is, the embodiment of FIG. 6 illustrates that the electrode terminal 120 and the venting portion 130 can be spaced the furthest apart on the battery case 110 by applying the terminal structure 200.

[0052] Meanwhile, although not shown, the extension terminals 220 of the terminal structure 200 coupled to the positive and negative terminals 122 and 124, respectively, may be designed to be asymmetrical with respect to each other vertically or horizontally.

[0053] (Second embodiment) A second embodiment of the present invention is illustrated in Figures 7 to 11. Figure 7 illustrates an example of a prismatic secondary battery 100 to which the second embodiment of the present invention is applied. The illustrated prismatic secondary battery 100 corresponds to a bidirectional secondary battery 100 in which electrode terminals 120 including a positive terminal 122 and a negative terminal 124 are separately arranged on both sides of a battery case 110.

[0054] Since the configuration of the terminal structure 200 is the same as that of the first embodiment, the second embodiment will be described below, focusing on the arrangement of the terminal structure 200 in the second embodiment, and in particular the arrangement of the extension terminals 220.

[0055] 8, in a prismatic secondary battery 100, a positive electrode terminal 122 and a negative electrode terminal 124 are disposed on both side surfaces of a battery case 110, and a vent 130 is disposed on at least one of the both side surfaces of the battery case 110. A pair of terminal structures 200 are electrically connected to the positive electrode terminal 122 and the negative electrode terminal 124, respectively, and an extension terminal 220 is exposed on the top surface of the battery case 110.

[0056] The embodiment of Fig. 8 can be said to be an embodiment that converts a bidirectional secondary battery into a unidirectional secondary battery, in contrast to the embodiment of Fig. 2. That is, this embodiment can convert a bidirectional secondary battery into a unidirectional secondary battery by separating the electrode terminals and venting portion 130 that are both arranged on the side of the battery case 110.

[0057] 9 to 12 illustrate various arrangements of extension terminals 220 according to a terminal structure 200 applied to a bidirectional secondary battery.

[0058] 9 shows an embodiment in which a pair of extension terminals 220 of the terminal structure 200 are disposed together on the front surface of the battery case 110. In another embodiment, a pair of extension terminals 220 are disposed on the rear surface of the battery case 110, which is opposite the front surface.

[0059] FIG. 10 shows an embodiment in which a pair of extension terminals 220 of the terminal structure 200 are separately arranged, one on the front surface and one on the rear surface of the battery case 110, and FIG. 11 shows an embodiment in which one of the pair of extension terminals 220 is exposed on one of the two opposite side surfaces of the battery case 110, and the other is exposed on one of the front and rear surfaces.

[0060] FIG. 12 illustrates an embodiment of a prismatic secondary battery 100 in which a positive terminal 122 and a negative terminal 124 are respectively disposed on both sides of a battery case 110, a venting portion 130 is disposed on at least one of both sides of the battery case 110, and an extension terminal 220 of a pair of terminal structures 200 is moved to the bottom of the battery case 110.

[0061] (Third embodiment) 13 to 17 are drawings relating to a third embodiment of the present invention.

[0062] Referring to the accompanying drawings, the prismatic secondary battery 100 has six flat surfaces, a first surface 111 to a sixth surface 116, that form a hexahedron. For ease of explanation and understanding, the first surface 111 to the sixth surface 116 are defined as follows based on the accompanying drawings: The four surfaces clockwise from the top are referred to as the first surface 111 to the fourth surface 114, the front surface is referred to as the fifth surface 115, and the rear surface is referred to as the sixth surface 116.

[0063] The embodiment of Figures 13 to 15 relates to a one-way secondary battery in which a positive electrode terminal 122 and a negative electrode terminal 124 are arranged on the upper surface, which is the first surface 111 among the first surface 111 to the sixth surface 116, and the positive electrode terminal 122 and the negative electrode terminal 124 are both arranged on the first surface 111, whereas the venting portion 130 is arranged on the other surfaces excluding the first surface 111.

[0064] 13 illustrates an example in which the venting portion 130 is disposed on the bottom surface, which is the third surface 113, and FIG. 14 illustrates an example in which the venting portion 130 is disposed on the right side surface, which is the second surface 112. An example in which the venting portion 130 is disposed on the left side surface, which is the fourth surface 114, is not separately illustrated because it is symmetrical to FIG. 14.

[0065] As shown in FIGS. 13 and 14, the prismatic secondary battery 100 of the third embodiment has the venting portions 130 arranged separately on the other side of the positive terminal 122 and the negative terminal 124 from the beginning, thereby providing high stability and installation flexibility.

[0066] 13 and 14 illustrate an example in which a venting portion 130 is provided on only one surface of a prismatic secondary battery 100. For reference, although the drawings show one venting portion 130 provided on one surface, multiple venting portions 130 may be provided on one surface.

[0067] 15 is a diagram illustrating an example in which venting portions 130 are provided on multiple surfaces of a prismatic secondary battery 100 according to the third embodiment. That is, as shown in (a) and (b) of FIG. 15, venting portions 130 may be provided on each of two opposing surfaces (e.g., the second and fourth surfaces) or two consecutive surfaces (e.g., the second and third surfaces), respectively. Alternatively, as shown in (c) of FIG. 15, venting portions 130 may be provided on each of three consecutive surfaces (e.g., the second to fourth surfaces). Although not shown, venting portions 130 may also be provided on the front and rear surfaces, i.e., the fifth and sixth surfaces 115 and 116.

[0068] However, if the prismatic secondary battery 100 has a rectangular parallelepiped shape, the positive electrode terminal 122 and the negative electrode terminal 124 may be disposed together on the surface with the largest area, i.e., on any surface excluding the front and rear surfaces in the drawing, and correspondingly, the venting portion 130 may be disposed on at least one of the remaining three surfaces excluding the two surfaces with the largest areas and located opposite each other.

[0069] This is because, when the prismatic secondary battery 100 has a flat rectangular shape as shown in the drawing, the greatest force acts on the front and rear surfaces, which have the largest area (assuming the internal pressure is uniform). Therefore, if the venting portions 130 are located on the front and rear surfaces, it is necessary to consider that the venting portions 130 may burst more easily than designed due to minor vibrations or disturbances.

[0070] In one embodiment of the present invention, the venting portion 130 may be configured to rupture to release gas when the internal pressure of the prismatic secondary battery 100 increases above a certain level. For example, the venting portion 130 may be notched to have a thinner thickness than the surrounding area, thereby making the venting portion 130 structurally weaker than the surrounding area. As a result, when an abnormality occurs in the prismatic secondary battery 100 and the internal pressure increases above a certain level, the venting portion 130 ruptures first, thereby releasing gas generated inside the secondary battery 100.

[0071] The embodiments of Figures 16 and 17 relate to a bidirectional secondary battery in which the positive electrode terminal 122 and the negative electrode terminal 124 are disposed on two opposite sides of the first surface 111 to the sixth surface 116, i.e., one electrode terminal 120 on each of the second surface 112 and the fourth surface 114 in the drawings.

[0072] This embodiment has the same basic concept as the above-described embodiment of Figures 13 to 15. However, the difference is that the positive electrode terminal 122 and the negative electrode terminal 124 are respectively disposed on two opposite faces of the hexahedron, which reduces the number of faces on which the venting portion 130 can be disposed by one.

[0073] 16, in addition to the second surface 112 and the fourth surface 114 on which the positive terminal 122 and the negative terminal 124 are respectively arranged, a venting portion 130 is arranged on the third surface 113 of the bottom. Furthermore, when the prismatic secondary battery 100 has a rectangular parallelepiped shape, the positive terminal 122 and the negative terminal 124 may be arranged on two surfaces opposite each other, excluding the surface with the largest area. Correspondingly, the venting portion 130 may be arranged on at least one of the two surfaces remaining, excluding the two surfaces with the largest areas, opposite each other.

[0074] That is, as shown in FIG. 16, a venting portion 130 may be arranged on one of the third surfaces 113 at the bottom, or as shown in FIG. 17, a venting portion 130 may be arranged on the first surface 111 corresponding to the top surface and the third surface 113 corresponding to the bottom surface located on the opposite side.

[0075] The present invention has been described in more detail above with reference to the drawings and embodiments, etc. However, the configurations described in the drawings or embodiments in this specification are merely one embodiment of the present invention and do not represent all of the technical ideas of the present invention, so it should be understood that there may be various equivalents and modifications that can replace them at the time of filing this application. [Industrial Applicability]

[0076] The present invention is suitable for application to a secondary battery equipped with a venting device.

[0077] Furthermore, the present invention preferably includes the following examples. [1] A battery case having a hexahedral shape; a positive electrode terminal and a negative electrode terminal, both of which are disposed on one of six sides of the battery case, or on two of the six sides of the battery case; a venting portion provided on the same surface as at least one of the positive electrode terminal and the negative electrode terminal; a terminal structure including an extension terminal electrically connected to an electrode terminal disposed on the same surface as the venting portion and exposed on any one surface other than the surface on which the venting portion is provided; A prismatic secondary battery comprising: [2] The terminal structure The prismatic secondary battery according to [1], comprising: a terminal body that is coupled to one or more surfaces of the battery case while enclosing the electrode terminal so that it is not exposed; and the extension terminal. [3] The prismatic secondary battery according to [2], wherein an extension wiring electrically connecting the extension terminal to the electrode terminal is not exposed to the outside of the terminal body. [4] The prismatic secondary battery according to [2], wherein the extension wiring electrically connecting the extension terminal to the electrode terminal is insulated from the outside. [5] The positive electrode terminal, the negative electrode terminal, and the venting portion are all disposed on the upper surface of the battery case, The prismatic secondary battery according to any one of [1] to [4], wherein the pair of terminal structures are electrically connected to the positive electrode terminal and the negative electrode terminal, respectively, and the extension terminals are exposed on both side surfaces of the battery case that are located opposite to each other. [6] The positive electrode terminal, the negative electrode terminal, and the venting portion are all disposed on the upper surface of the battery case, The prismatic secondary battery according to any one of [1] to [4], wherein the pair of terminal structures are electrically connected to the positive electrode terminal and the negative electrode terminal, respectively, and the extension terminals are exposed on the front surface or the rear surface located on opposite sides of the battery case. [7] The prismatic secondary battery according to [6], wherein the pair of extension terminals of the terminal structure are both arranged on either the front or rear surface of the battery case, or one on each of the front and rear surfaces of the battery case. [8] The positive electrode terminal, the negative electrode terminal, and the venting portion are all disposed on the upper surface of the battery case, The pair of terminal structures are electrically connected to the positive electrode terminal and the negative electrode terminal, respectively, and the extension terminals are exposed on either one of both side surfaces and either one of the front and rear surfaces located on opposite sides of the battery case. [9] The positive electrode terminal, the negative electrode terminal, and the venting portion are all disposed on the upper surface of the battery case, The prismatic secondary battery according to any one of [1] to [4], wherein the pair of terminal structures are electrically connected to the positive electrode terminal and the negative electrode terminal, respectively, and the extension terminals are exposed on a bottom surface of the battery case.

[10] The positive electrode terminal and the negative electrode terminal are respectively disposed on both side surfaces of the battery case, and the venting portion is disposed on at least one of the both side surfaces of the battery case; The prismatic secondary battery according to any one of [1] to [4], wherein the pair of terminal structures are electrically connected to the positive electrode terminal and the negative electrode terminal, respectively, and the extension terminals are exposed on an upper surface of the battery case.

[11] The positive electrode terminal and the negative electrode terminal are respectively disposed on both side surfaces of the battery case, and the venting portion is disposed on at least one of the both side surfaces of the battery case; The prismatic secondary battery according to any one of [1] to [4], wherein the pair of terminal structures are electrically connected to the positive electrode terminal and the negative electrode terminal, respectively, and the extension terminals are exposed on a front surface or a rear surface of the battery case, respectively.

[12] The prismatic secondary battery according to

[11] , wherein the pair of extension terminals of the terminal structure are both arranged on either the front or rear surface of the battery case, or one on each of the front and rear surfaces of the battery case.

[13] The positive electrode terminal and the negative electrode terminal are respectively disposed on both side surfaces of the battery case, and the venting portion is disposed on at least one of the both side surfaces of the battery case; The prismatic secondary battery according to any one of [1] to [4], wherein the pair of terminal structures are electrically connected to the positive electrode terminal and the negative electrode terminal, respectively, and the extension terminals are exposed on one of the top surface and the front and rear surfaces of the battery case.

[14] The positive electrode terminal and the negative electrode terminal are respectively disposed on both side surfaces of the battery case, and the venting portion is disposed on at least one of the both side surfaces of the battery case; The prismatic secondary battery according to any one of [1] to [4], wherein the pair of terminal structures are electrically connected to the positive electrode terminal and the negative electrode terminal, respectively, and the extension terminals are exposed on a bottom surface of the battery case.

[15] In a prismatic secondary battery in which six flat surfaces, ie, the first surface to the sixth surface, form a hexahedron, A prismatic secondary battery in which a positive electrode terminal and a negative electrode terminal are arranged on at least one of the first to sixth surfaces, and a venting portion is arranged on at least one of the remaining surfaces excluding the surfaces on which the positive electrode terminal and the negative electrode terminal are arranged.

[16] The prismatic secondary battery according to

[15] , wherein the positive electrode terminal and the negative electrode terminal are both disposed on one of the first to sixth surfaces.

[17] The prismatic secondary battery has a rectangular parallelepiped shape, The prismatic secondary battery according to

[16] , wherein the positive electrode terminal and the negative electrode terminal are both arranged on one surface of the battery except for the surface with the largest area.

[18] The prismatic secondary battery according to

[17] , wherein the venting portion is arranged on at least one of the three surfaces excluding the two surfaces having the largest areas and located opposite each other.

[19] The prismatic secondary battery according to

[15] , wherein the positive electrode terminal and the negative electrode terminal are disposed one on each of two surfaces that are opposite to each other among the first surface to the sixth surface.

[20] The prismatic secondary battery has a rectangular parallelepiped shape, The prismatic secondary battery according to

[19] , wherein the positive electrode terminal and the negative electrode terminal are respectively disposed on two surfaces opposite to each other, excluding the surface with the largest area. [Explanation of symbols]

[0078] 100: Square secondary battery 110: Battery case 111: 1st side 112: 2nd side 113:Side 3 114:Side 4 115:Side 5 116:Side 6 120: Electrode terminal 122: Positive electrode terminal 124: Negative terminal 130: Venting section 200: Terminal structure 210: Terminal body 220: Extension terminal 230: Extension wiring

Claims

1. In a prismatic secondary battery in which six flat surfaces, ie, first to sixth surfaces, form a hexahedron, a positive electrode terminal and a negative electrode terminal are disposed on at least one of the first to sixth surfaces, and a venting portion is disposed on at least one of the remaining surfaces excluding the surfaces on which the positive electrode terminal and the negative electrode terminal are disposed; The venting portion is notched in a single wave shape.

2. 2. The prismatic secondary battery of claim 1, wherein the vent is located on a surface that is the longest excluding a surface having the widest area, and a long side of the vent is disposed parallel to an extension direction of the long surface.

3. The prismatic secondary battery of claim 1 , wherein the positive electrode terminal and the negative electrode terminal are both disposed on one of the first to sixth surfaces.

4. The prismatic secondary battery has a rectangular parallelepiped shape, The prismatic secondary battery according to claim 3 , wherein the positive electrode terminal and the negative electrode terminal are both disposed on one surface of the battery except for the surface having the largest area.

5. The prismatic secondary battery according to claim 4 , wherein the vent is disposed on at least one of three surfaces excluding two surfaces having the largest areas and located opposite each other.

6. 2. The prismatic secondary battery according to claim 1, wherein the positive electrode terminal and the negative electrode terminal are disposed on two surfaces, one of the first surface to the sixth surface, that are opposite to each other.

7. The prismatic secondary battery has a rectangular parallelepiped shape, The prismatic secondary battery according to claim 6 , wherein the positive electrode terminal and the negative electrode terminal are respectively disposed on two surfaces opposite to each other except for the surface with the largest area.

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