Secondary battery with venting

Abstract

The disclosed invention relates to a prismatic secondary battery, comprising: a hexahedral battery case; a positive electrode terminal and a negative electrode terminal disposed together on any one or any two of six faces of the battery case; a venting portion provided on the same face 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 face as the venting portion and exposed on any one face excluding the face on which the venting portion is provided.

Description

[Technical field]

[0001] The present invention relates to a secondary battery having a venting portion, 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 dated February 14, 2022, and all contents disclosed in the documents of that 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 capacity, so they have been the subject of much research and development in recent years. The 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 the modern demand for environmental protection.

[0004] Secondary batteries are classified into coin type batteries, cylindrical type batteries, square type batteries, and pouch type batteries according to the shape of the battery case. The electrode assembly installed inside the battery case of the secondary battery is a power generating element capable of charging and discharging, which is made 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 with a separator interposed between them; a stack type in which a number of positive electrodes and negative electrodes are sequentially stacked with a separator interposed between them; and a stack & folding type in which a stack type unit cell is wound with a long separator film.

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

[0007] When the secondary battery is operating normally, the arrangement of the venting part does not cause any particular problems, but if the internal pressure of the secondary battery increases abnormally and the venting part breaks to release gas, it may damage the adjacent electrode terminals. That is, if the venting part breaks and the internal gas erupts, the positive and negative terminals will be damaged by corrosion, fire, etc., and the damage to the electrode terminals will lead to electrical problems, making it highly likely that the damage will not be limited to the secondary battery. That is, if the electronic circuit of the module / pack is located at the position of the terminal part, the risk of explosion due to malfunction of the electronic circuit during venting is increased. [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 escape of internal gas due to the rupture or opening of a vent provided in the secondary battery.

[0010] However, the technical problem that the present invention aims to solve is not limited to the above-mentioned problem, and other problems not mentioned will be clearly understood by those of ordinary skill 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 one or both of six faces of the battery case; a venting portion provided on the same face 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 face as the venting portion and exposed on one face excluding the face on which the venting portion 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 the electrode terminal is not exposed, and the extension terminal.

[0013] Further, 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 terminal, the negative terminal, and the venting portion are disposed together on an upper surface of the battery case, a pair of terminal structures are electrically connected to the positive terminal and the negative terminal, respectively, and the extension terminals may be exposed on both side surfaces located on opposite sides of the battery case.

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

[0020] Meanwhile, according to another embodiment of the present invention, 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 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 an upper surface of the battery case.

[0021] Alternatively, 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 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 to a 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 both side surfaces of the battery case, a pair of terminal structures may be electrically connected to the positive and negative terminals, and the extension terminals may be exposed on one of an upper surface and a front and rear surface of the battery case.

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

[0025] In the prismatic secondary battery of the present invention having the above-mentioned configuration, even if the electrode terminal and the venting part are arranged on the same surface of the battery case, the electrode terminal can be arranged separately on a physically different surface from the venting part by applying a terminal structure. Therefore, it becomes possible to freely change the position of the electrode terminal 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 rectangular secondary batteries can be easily changed, which allows 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 of ordinary skill 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. Therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. [Brief description of the drawings]

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

[0030] Since the present invention can be modified in various ways and can have various embodiments, specific embodiments will be described in detail below.

[0031] However, this is not intended to limit the invention to the particular embodiments, 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, but should be understood as not precluding the presence or additional possibility of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0033] In addition, 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 in between. 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 in between. In addition, in the present application, being "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, comprising: a positive electrode terminal and a negative electrode terminal disposed together on any one or any two of six surfaces of a battery case; a venting portion 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 venting portion and exposed on any one surface excluding the surface having the venting portion.

[0035] Although the prismatic secondary battery according to the embodiment of the present invention is designed and manufactured so that the electrode terminal and the venting part are disposed on the same surface, the electrode terminal can be disposed on a physically different surface from the venting part 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, which can reduce the development and production costs of the prismatic secondary battery.

[0036] In addition, in the prismatic secondary battery according to one embodiment of the present invention, the position of the electrode terminals can be freely determined in consideration of the position of the venting portion. As a result, when designing a battery module or pack, the diffusion direction of gas or flames ejected from the venting portion can be easily set in the safest direction, while ensuring a high degree of freedom in determining the optimal position 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, up, down, etc. used in the description of each embodiment are used only for understanding 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 a first embodiment of the present invention may 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 upper surface of a battery case 110.

[0039] Also, a venting portion 130 is disposed on the upper 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 discharges gas when the internal pressure of the prismatic secondary battery 100 increases to a certain level or more. For example, the venting portion 130 may be structurally weakened compared to the surrounding area by performing a notching process so that the venting portion 130 has a smaller thickness than the surrounding area. As a result, when an abnormality occurs in the prismatic secondary battery 100 and the internal pressure increases to a certain level or more, the venting portion 130 breaks first, thereby discharging the gas generated inside the prismatic secondary battery 100.

[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 in an emergency and the internal gas is released. The present invention aims to solve this problem by providing a terminal structure 200.

[0041] 2 is a perspective view illustrating a connection structure between the rectangular secondary battery 100 and the terminal structure 200. The terminal structure 200 is a hinge-shaped structure that connects across two or more adjacent surfaces on 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 which 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 in a form which encloses 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 are 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] In this manner, 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 arranged 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, but the extension wire 230 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 or the like. This prevents problems such as the extension wire 230 being damaged or an electrical short circuit caused by only the extension terminal 220 being 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 parts and coupled to the terminal body 210.

[0046] 2, the positive electrode terminal 122 and the negative electrode terminal 124, which were disposed adjacent to the venting portion 130 on the upper surface of the battery case 110, have been moved to both side surfaces 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 has resulted in converting a unidirectional secondary battery in which the positive electrode terminal 122 and the negative electrode terminal 124 are both disposed on the upper surface of the battery case 110 into a bidirectional secondary battery.

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

[0048] 3 shows an embodiment in which the 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 opposite the front surface, i.e., an embodiment symmetrical to that of FIG. 3, is also possible.

[0049] Fig. 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 to one of both side surfaces located on opposite sides of the battery case 110, and the other is exposed to 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 terminal 122, the negative terminal 124, and the venting portion 130 are all disposed 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 The second embodiment of the present invention is illustrated in Figures 7 to 11. Figure 7 is a drawing illustrating an example of a prismatic secondary battery 100 to which the second embodiment of the present invention is applied, and 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 following description of the second embodiment will focus on the arrangement of the terminal structure 200, particularly the arrangement of the extension terminals 220, in the second embodiment.

[0055] 8, in a rectangular 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 venting portion 130 is disposed on at least one of 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 upper surface of the battery case 110.

[0056] The embodiment of Fig. 8 can be said to be an embodiment in which a bidirectional secondary battery is converted into a unidirectional secondary battery, in contrast to the embodiment of Fig. 2. That is, the electrode terminal and the venting portion 130, both of which are arranged on the side of the battery case 110, are separated, and at the same time, the bidirectional secondary battery can be converted into a unidirectional secondary battery.

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

[0058] 9 shows an embodiment in which the extension terminals 220 of a pair of terminal structures 200 are disposed together on the front surface of the battery case 110. Also, 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, is also possible.

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

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

[0062] With reference to the accompanying drawings, the rectangular secondary battery 100 has six flat surfaces, a first surface 111 to a sixth surface 116, which form a hexahedral shape, and 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 surface 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 located 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, in the rectangular secondary battery 100 of the third embodiment, the venting portion 130 is arranged separately on another side with respect to the positive terminal 122 and the negative terminal 124 from the beginning, thereby providing high stability and freedom of installation.

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

[0067] Fig. 15 is a diagram illustrating an example of a case where the venting portion 130 is provided across a plurality of surfaces in the prismatic secondary battery 100 according to the third embodiment. That is, as shown in Fig. 15(a) and (b), the venting portion 130 may be provided across two opposing surfaces (e.g., the second surface and the fourth surface) or two consecutive surfaces (e.g., the second surface and the third surface), respectively, or as shown in Fig. 15(c), the venting portion 130 may be provided across three consecutive surfaces (e.g., the second surface to the fourth surface). Although not shown, the venting portion 130 may also be provided on the front and rear surfaces, i.e., the fifth surface 115 and the sixth surface.

[0068] However, when 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 having the largest area, i.e., on any surface other than 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 other than the two surfaces having 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 that the internal pressure is uniform). Therefore, if the venting portions 130 are located on the front and rear surfaces, it must be taken into consideration 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 break and 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, making it 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 breaks first, allowing gas generated inside the secondary battery 100 to be released.

[0071] The embodiment of Figures 16 and 17 relates to a bidirectional secondary battery in which a positive terminal 122 and a negative terminal 124 are disposed on two of the first surface 111 to the sixth surface 116, that is, on both side surfaces of the second surface 112 and the fourth surface 114 in the drawings, and one electrode terminal 120 is disposed on each of the two surfaces.

[0072] This embodiment has the same basic concept as the embodiment of Figures 13 to 15. However, there is a difference in that the positive electrode terminal 122 and the negative electrode terminal 124 are respectively disposed on two opposite faces of a hexahedron, so that the number of faces on which the venting portion 130 can be disposed is reduced 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. 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 located opposite each other except for the surface having the largest area. Correspondingly, the venting portion 130 may be arranged on at least one of the two remaining surfaces excluding the two surfaces having the largest areas and located 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 each of the first surface 111 corresponding to the top surface and the third surface 113, which is 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, etc. in this specification are merely one embodiment of the present invention and do not fully represent 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. [Explanation of symbols]

[0077] 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 terminal 124: Negative terminal 130: Venting section 200: Terminal structure 210: Terminal body 220: Extension terminal 230: Extension wiring

Claims

1. A battery case having a hexahedral shape; a positive electrode terminal and a negative electrode terminal, both of which are disposed on one surface of the six surfaces of the battery case, or each of which is disposed on two surfaces of the six surfaces 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 bending portion and exposed on any one surface other than the surface on which the bending portion is provided; Including, The terminal structure has a surface on which the venting portion is provided, and the electrode terminal is not exposed.

2. A battery case having a hexahedral shape, a positive electrode terminal and a negative electrode terminal, both of which are disposed on one surface of the six surfaces of the battery case, or each of which is disposed on two surfaces of the six surfaces 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 bending portion and exposed on any one surface other than the surface on which the bending portion is provided; Including, The terminal structure includes: A prismatic secondary battery comprising: a terminal body coupled to one or more surfaces of the battery case while enclosing the electrode terminal so that the electrode terminal is not exposed; and the extension terminal.

3. The prismatic secondary battery of claim 2 , wherein an extension wire 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 claim 2 , wherein an extension wire 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 an upper surface of the battery case; 5. The prismatic secondary battery of claim 1, wherein a 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 opposite to each other.

6. the positive electrode terminal, the negative electrode terminal, and the venting portion are all disposed on an upper surface of the battery case; 5. The prismatic secondary battery of claim 1, wherein a pair of terminal structures are electrically connected to the positive electrode terminal and the negative electrode terminal, respectively, and the extension terminals are exposed to a front surface or a rear surface located on opposite sides of the battery case.

7. 7. The prismatic secondary battery of claim 6, wherein the extension terminals of the pair of terminal structures are both disposed on either a front surface or a rear surface of the battery case, or one each on the front surface and the rear surface of the battery case.

8. the positive electrode terminal, the negative electrode terminal, and the venting portion are all disposed on an upper surface of the battery case; 5. The prismatic secondary battery of claim 1, 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 to 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 an upper surface of the battery case; 5. The prismatic secondary battery according to claim 1, wherein a pair of terminal structures are electrically connected to the positive electrode terminal and the negative electrode terminal, respectively, and the extension terminals are exposed to a bottom surface of the battery case.

10. the positive electrode terminal and the negative electrode terminal are disposed on both sides of the battery case, respectively, and the venting portion is disposed on at least one of the both sides of the battery case; 5. The prismatic secondary battery according to claim 1, wherein a 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 disposed on both sides of the battery case, respectively, and the venting portion is disposed on at least one of the both sides of the battery case; 5. The prismatic secondary battery of claim 1, wherein a pair of terminal structures are electrically connected to the positive electrode terminal and the negative electrode terminal, respectively, and the extension terminals are exposed to a front surface or a rear surface of the battery case.

12. 12. The prismatic secondary battery of claim 11, wherein the pair of extension terminals of the terminal structure are disposed together on either a front surface or a rear surface of the battery case, or one each on the front surface and the rear surface of the battery case.

13. the positive electrode terminal and the negative electrode terminal are disposed on both sides of the battery case, respectively, and the venting portion is disposed on at least one of the both sides of the battery case; 5. The prismatic secondary battery of claim 1, wherein a pair of terminal structures are electrically connected to the positive electrode terminal and the negative electrode terminal, respectively, and the extension terminals are exposed to one of an upper surface and a front and rear surfaces of the battery case.

14. the positive electrode terminal and the negative electrode terminal are disposed on both sides of the battery case, respectively, and the venting portion is disposed on at least one of the both sides of the battery case; 5. The prismatic secondary battery according to claim 1, wherein a pair of terminal structures are electrically connected to the positive electrode terminal and the negative electrode terminal, respectively, and the extension terminals are exposed to a bottom surface of the battery case.

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