Secondary battery including venting part

Abstract

To provide a prismatic secondary battery capable of effectively responding to damage and deterioration of electrode terminals caused by ejection of internal gas due to the breakage or opening of a venting part provided in a secondary battery.SOLUTION: The disclosed invention relates to a prismatic secondary battery which includes: a battery case forming a hexahedral shape; a positive electrode terminal and a negative electrode terminal disposed together on at least one surface or are disposed on two surfaces of the six surfaces of the battery case, respectively; a venting part provided on the same surface of at lest one of the positive electrode terminal and the negative electrode terminal; and a terminal structure electrically connected to the electrode terminal disposed on the same surface as the venting part, and including an extension terminal exposed on one surface excluding a surface provided with the venting part.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a secondary battery including a bending part, and particularly to a rectangular 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 the contents disclosed in the document of the Korean patent application are incorporated herein by reference.

Background Art

[0003] Unlike a primary battery, a secondary battery can be recharged, and due to the possibility of miniaturization and high capacity, it has been extensively researched and developed in recent years. With the increasing technological development and demand for mobile devices, and the emergence of electric vehicles and energy storage systems in line with the contemporary requirements of environmental protection, the demand for secondary batteries as an energy source has been increasing even more rapidly.

[0004] Secondary batteries are classified into coin-type batteries, cylindrical batteries, rectangular batteries, and pouch-type batteries according to the shape of the battery case. The electrode assembly mounted inside the battery case in a secondary battery is a power generation element capable of charge and discharge, which consists of a laminated structure of electrodes and a separator.

[0005] The electrode assembly can be roughly classified into a jellyroll type in which a separator is interposed between a sheet-shaped positive electrode and a negative electrode coated with an active material and wound, a stack type in which a large number of positive electrodes and negative electrodes are sequentially laminated with a separator interposed therebetween, and a stack-and-folding type in which unit cells of the stack type are wound with a long separation film.

[0006] Among various types of secondary batteries, looking at the rectangular secondary battery, in most cases, the positive electrode terminal and the negative electrode terminal are arranged together on one surface, or are arranged one by one on both opposite side surfaces. Also, the venting parts provided for the safety of the secondary battery are generally arranged one by one between the positive electrode terminal and the negative electrode terminal arranged together on one surface, or next to the electrode terminals on both opposite side surfaces.

[0007] When the secondary battery is operating normally, the arrangement structure of the venting part does not cause any particular problems. However, if the internal pressure of the secondary battery increases abnormally and the venting part breaks to discharge gas, there is a risk of damaging the adjacent electrode terminals. That is, when the venting part breaks and the internal gas jets out, the positive electrode terminal and the negative electrode terminal will be damaged such as corrosion and ignition. The damage to the electrode terminals will lead to electrical problems and is likely to not be limited to the damage of the secondary battery only. That is, when the electronic circuit of the module / pack is located at a certain position where the terminal part is located, the risk of explosion due to the malfunction of the electronic circuit during venting is aggravated.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] An object of the present invention is to provide a rectangular secondary battery that can effectively cope with damage and deterioration of electrode terminals caused by the ejection of internal gas due to the breakage or opening of a venting part provided in the secondary battery.

[0010] However, the technical problems to be solved by the present invention 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, the rectangular secondary battery according to the present invention includes a battery case having a hexahedron shape, a positive electrode terminal and a negative electrode terminal that are disposed together on any one of the six surfaces of the battery case or on any two surfaces respectively, a bending 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 that is electrically connected to the electrode terminal disposed on the same surface as the bending portion and is exposed on any one surface excluding the surface provided with the bending portion.

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

[0013] And the extension wiring that electrically connects the extension terminal to the electrode terminal is not exposed outside the terminal body.

[0014] And the extension wiring that electrically connects the extension terminal to the electrode terminal is insulated from the outside.

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

[0016] Or, the positive electrode terminal, the negative electrode terminal, and the bending portion are all disposed on the upper surface of the battery case, and the pair of terminal structures are electrically connected to the positive electrode terminal and the negative electrode terminal respectively, and the extension terminals can be exposed on the front surface or the rear surface of the battery case located on opposite sides of each other.

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

[0018] And the positive electrode terminal, the negative electrode terminal, and the bending portion are arranged together 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 may be exposed on either one of the two opposite side surfaces and either one of the front and rear surfaces of the battery case.

[0019] Or, the positive electrode terminal, the negative electrode terminal, and the bending portion are arranged together 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 may be exposed on the bottom surface of the battery case.

[0020] On the other hand, according to another embodiment of the present invention, the positive electrode terminal and the negative electrode terminal are arranged on the two side surfaces of the battery case respectively, the bending portion is arranged on at least one of the two side surfaces 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 may be exposed on the upper surface of the battery case.

[0021] Or, the positive electrode terminal and the negative electrode terminal are arranged on the two side surfaces of the battery case respectively, the bending portion is arranged on at least one of the two side surfaces 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 may be exposed on the front or rear surface of the battery case.

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

[0023] And the positive electrode terminal and the negative electrode terminal are respectively arranged on both side surfaces of the battery case, the bending part is arranged on at least one of the both side surfaces of the battery case, the pair of terminal structures are electrically connected to the positive electrode terminal and the negative electrode terminal respectively, and it is also possible to configure such that the extension terminals are respectively exposed on one of the upper surface, front surface, and rear surface of the battery case.

[0024] Or, the positive electrode terminal and the negative electrode terminal are respectively arranged on both side surfaces of the battery case, the bending part is arranged on at least one of the both side surfaces 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 can also be respectively exposed on the bottom surface of the battery case.

Advantages of the Invention

[0025] For the rectangular secondary battery of the present invention having the above-described configuration, even if the electrode terminal and the bending part are arranged on the same surface of the battery case, the terminal structure can be applied to separately arrange the electrode terminal on a physically different surface with respect to the bending part. Therefore, the position of the electrode terminal can be freely changed without changing the internal structure of the existing rectangular secondary battery, and the development and production costs of the rectangular secondary battery can be reduced.

[0026] In addition, by being able to easily change the position of the electrode terminal of the rectangular secondary battery, a high degree of freedom can be given to the design of the battery module and the pack.

[0027] However, the technical effects that can be obtained by the present invention are not limited to the above-described effects, 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 serve to further understand the technical idea of the present invention together with the detailed description of the invention to be described later. Therefore, the present invention should not be construed as being limited only to the matters described in such drawings.

Brief Description of the Drawings

[0029]

Figure 1

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Figure 17

[0030] Since the present invention can be subjected 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 present invention to specific embodiments, and it should be understood to include all modifications, equivalents, or alternatives included in the spirit and technical scope of the present invention.

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

[0033] Also, in the present invention, when a part such as a layer, film, region, or plate is described as being "on" another part, this includes not only the case where it is "directly on" the other part but also the case where there is another part in between. Conversely, when a part such as a layer, film, region, or plate is described as being "under" another part, it includes not only the case where it is "directly under" the other part but also the case where there is another part in between. Also, in the present application, being "disposed on" can include the case of being disposed not only on the upper part but also on the lower part.

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

[0035] Even if a rectangular secondary battery according to an embodiment of the present invention is designed and manufactured such that the electrode terminal and the bending portion are disposed on the same surface, the terminal structure can be applied to separately dispose the electrode terminal on a physically different surface with respect to the bending portion. Therefore, by being able to freely change the position of the electrode terminal without changing the internal structure of the existing rectangular secondary battery, it becomes possible to reduce the development and production costs of the rectangular secondary battery.

[0036] Also, a rectangular secondary battery according to an embodiment of the present invention can freely determine the position of the electrode terminal in consideration of the position of the bending portion, and thereby, when designing a battery module or a pack, it is possible to easily set the diffusion direction of gas or flame ejected from the bending portion in the safest direction and at the same time ensure a high degree of freedom to optimally determine the position of the electrode terminal.

[0037] Hereinafter, specific embodiments of the rectangular secondary battery of the present invention will be described with reference to the accompanying drawings. Terms specifying relative positions such as front, rear, left, right, up, and down used in the description of each embodiment are merely used for understanding the invention, and unless otherwise specified, are based on the directions shown in the drawings.

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

[0039] And, venting portions 130 are both arranged 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 rectangular secondary battery 100 increases to a certain level or more. For example, the venting portion 130 may be made structurally weaker than the peripheral region by performing notching processing so as to have a thinner thickness than the peripheral region. Thereby, when an abnormality occurs in the rectangular secondary battery 100 and the internal pressure increases to a certain level or more, the venting portion 130 breaks first, and the gas generated inside the rectangular secondary battery 100 is discharged.

[0040] However, when the venting portion 130 and the electrode terminals 120 are located on the same surface of the battery case 110, when the venting portion 130 breaks and internal gas jets out in an emergency, the electrode terminals 120 are likely to be damaged such as corrosion and ignition. The present invention attempts to solve such a problem by providing a terminal structure 200.

[0041] FIG. 2 is a perspective view showing a coupling structure between the rectangular secondary battery 100 and the terminal structure 200. The terminal structure 200 is a hinge-like structure that couples over 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 that wraps around the electrode terminals 120, that is, the positive electrode terminal 122 and the negative electrode terminal 124, so that they are not exposed, and is closely bonded over two adjacent surfaces on the battery case 110. For example, in the embodiment of FIG. 2, the terminal body 210 is configured to wrap around the front and rear surfaces and the side surface adjacent to the upper surface of the battery case 110. By bonding (such as adhesion or joining) the terminal body 210 to the battery case 110, the terminal structure 200 is fixed 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 of the surfaces of the terminal body 210. That is, since the positive electrode terminal 122 and the negative electrode terminal 124 are wrapped by the terminal body 210 and not exposed, the extension terminal 220 serves as a new electrode terminal 120 that has moved to a surface other than the upper surface where the bending portion 130 is located, for example, in the embodiment of FIG. 2, on the side surface of the battery case 110.

[0044] Thus, the rectangular secondary battery 100 according to the 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 bending portion 130 without any separate design changes only by applying the terminal structure 200. Therefore, the present invention can reduce the development period and production cost of the rectangular secondary battery 100 by being able to freely change the position of the electrode terminal 120 and separate it from the bending portion 130 without changing the internal structure of the existing rectangular secondary battery 100.

[0045] The electrode terminal 120 and the extension terminal 220 are electrically connected via the extension wiring 230, but the extension wiring 230 is not exposed outside the terminal body 210. And the extension wiring 230 is insulated from the outside. For example, the extension wiring 230 and the extension terminal 220 can be embedded in the terminal body 210 made of an insulating resin material by insert molding or the like. Thereby, only the extension terminal 220 is exposed to the outside, preventing problems such as damage to the extension wiring 230 or occurrence of an electrical short. For reference, the extension wiring 230 and the extension terminal 220 can be configured integrally or as separate components and coupled to the terminal body 210.

[0046] Looking again at the embodiment of FIG. 2, the positive electrode terminal 122 and the negative electrode terminal 124 that were adjacently arranged to the bending portion 130 on the upper surface of the battery case 110 were 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 led to the conversion of a one-way secondary battery in which the positive electrode terminal 122 and the negative electrode terminal 124 were both arranged on the upper surface of the battery case 110 into a two-way secondary battery.

[0047] In addition to the embodiment of FIG. 2, various embodiments in which the electrode terminal 120 is separated from the bending portion 130 are also possible, and such variations are illustrated in FIGS. 3 to 6.

[0048] FIG. 3 shows an embodiment in which the extension terminals 220 of a pair of terminal structures 200 are arranged together on the front surface of the battery case 110. Of course, an embodiment that is symmetric to FIG. 3, in which a pair of extension terminals 220 are arranged on the rear surface located on the opposite side of the front surface of the battery case 110, is also possible.

[0049] FIG. 4 illustrates an embodiment in which the extension terminals 220 of the pair of terminal structures 200 are separately arranged one by one on the front and rear surfaces of the battery case 110. And FIG. 5 is 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 one is exposed on one of the front and rear surfaces.

[0050] In this way, by diversely designing the specifications of the terminal structure 200, the arrangements of the positive electrode terminal 122 and the negative electrode terminal 124 can be diversely changed, and thereby, when configuring a battery module or a pack, a high degree of freedom can be given to the design of electrical wirings such as bus bars.

[0051] FIG. 6 illustrates an embodiment in which, in the rectangular secondary battery 100 in which the positive electrode terminal 122, the negative electrode terminal 124, and the venting portion 130 are all arranged on the upper surface of the battery case 110, the extension terminals 220 of the pair of terminal structures 200 are moved to the bottom surface of the battery case 110. That is, the embodiment of FIG. 6 shows that by applying the terminal structure 200, the electrode terminal 120 and the venting portion 130 can be separated from each other by the maximum distance on the battery case 110.

[0052] On the other hand, although not shown, the extension terminals 220 of the terminal structure 200 respectively connected to the positive electrode terminal 122 and the negative electrode terminal 124 can also be designed to be asymmetric with respect to each other vertically or horizontally.

[0053] (Second Embodiment) The second embodiment of the present invention is illustrated in FIGS. 7 to 11. FIG. 7 is a drawing illustrating an example of the rectangular secondary battery 100 to which the second embodiment of the present invention is applied. The illustrated rectangular secondary battery 100 corresponds to a bi-directional secondary battery 100 in which the electrode terminals 120 including the positive electrode terminal 122 and the negative electrode terminal 124 are separately arranged one by one on both side surfaces of the 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 with a focus on the arrangement of the terminal structure 200 in the second embodiment, particularly the arrangement of the extension terminals 220.

[0055] Regarding the embodiment shown in FIG. 8, in the rectangular secondary battery 100, the positive electrode terminal 122 and the negative electrode terminal 124 are respectively arranged on both side surfaces of the battery case 110, and the bending portion 130 is arranged on at least one of the two side surfaces of the battery case 110. And the pair of terminal structures 200 are electrically connected to the positive electrode terminal 122 and the negative electrode terminal 124 respectively, and the extension terminals 220 are respectively exposed on the upper surface of the battery case 110.

[0056] The embodiment shown in FIG. 8 can be said to be an embodiment that converts a bidirectional secondary battery into a unidirectional secondary battery, contrary to the embodiment shown in FIG. 2 described above. That is, it is an embodiment in which the electrode terminals and the bending portion 130 arranged together on the side surface of the battery case 110 are separated, and at the same time, the bidirectional secondary battery can be changed into a unidirectional secondary battery.

[0057] FIGS. 9 to 12 illustrate various arrangement forms of the extension terminals 220 by the terminal structure 200 applied to the bidirectional secondary battery.

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

[0059] FIG. 10 shows an embodiment in which the extension terminals 220 of the pair of terminal structures 200 are respectively arranged one by one on the front surface and 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 side surfaces located on the opposite sides of the battery case 110, and the other one is exposed on one of the front and rear surfaces.

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

[0061] (Third Embodiment) FIGS. 13 to 17 are drawings related to the third embodiment of the present invention.

[0062] Referring to the accompanying drawings, in the rectangular secondary battery 100, six planes of a first surface 111 to a sixth surface 116 form a hexahedron shape, and for convenience of explanation and understanding, the first surface 111 to the sixth surface 116 are defined as follows with reference to the accompanying drawings. Four surfaces rotating clockwise from the upper 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 embodiments of FIGS. 13 to 15 relate to a unidirectional secondary battery in which a positive electrode terminal 122 and a negative electrode terminal 124 are disposed on the upper surface which is the first surface 111 among the first surface 111 to the sixth surface 116. The positive electrode terminal 122 and the negative electrode terminal 124 are both disposed on the first surface 111, while the bending portion 130 is disposed on other surfaces except the first surface 111.

[0064] FIG. 13 illustrates an example in which the bending portion 130 is disposed on the bottom surface which is the third surface 113, and FIG. 14 illustrates an example in which the bending portion 130 is disposed on the right side surface which is the second surface 112. An example in which the bending portion 130 is located on the left side surface which is the fourth surface 114 is a symmetric form of FIG. 14, and thus is not separately illustrated.

[0065] As illustrated in FIGS. 13 and 14, in the rectangular secondary battery 100 of the third embodiment, the bending portion 130 is separately disposed on other surfaces with respect to the positive electrode terminal 122 and the negative electrode terminal 124 from the beginning, and thus has high stability and installation freedom.

[0066] The embodiment illustrated in FIGS. 13 and 14 shows an example of the rectangular secondary battery 100 having the venting portion 130 provided only on one surface. For reference, although the drawings show that one venting portion 130 is provided on one surface, it is also possible to provide a plurality of venting portions 130 on one surface.

[0067] FIG. 15 is a drawing exemplarily showing a case where the rectangular secondary battery 100 according to the third embodiment is provided with venting portions 130 over a plurality of surfaces. That is, as shown in FIGS. 15(a) and 15(b), venting portions 130 are respectively provided over two facing surfaces (for example, the second surface and the fourth surface) or two continuous surfaces (for example, the second surface and the third surface), or as shown in FIG. 15(c), venting portions 130 can be respectively provided over three continuous surfaces (for example, the second surface to the fourth surface). And although not shown, it goes without saying that venting portions 130 can also be provided on the front surface and the rear surface, that is, the fifth surface 115 and the sixth surface.

[0068] However, when the rectangular secondary battery 100 has a rectangular parallelepiped shape, the positive electrode terminal 122 and the negative electrode terminal 124 can be arranged together on one surface with the largest area, that is, any one surface excluding the front surface and the rear surface on the drawing. Correspondingly, the venting portion 130 can be arranged on at least any one of the remaining three surfaces excluding the two surfaces with the largest area and located on opposite sides of each other.

[0069] This is because, as shown in the drawing, when the rectangular secondary battery 100 is in a flat rectangular parallelepiped form, the largest force acts on the front surface and the rear surface with the largest area (assuming that the internal pressure is uniform). Therefore, when the venting portion 130 is located on the front surface and the rear surface, it is necessary to consider that the venting portion 130 can be more easily ruptured than the design purpose by weak vibration or disturbance.

[0070] In one embodiment of the present invention, the bending portion 130 may be configured to break and discharge gas when the internal pressure of the rectangular secondary battery 100 increases to a certain level or more. For example, the bending portion 130 may be made structurally weaker than the peripheral region by performing notching so as to have a thinner thickness than the peripheral region. Thereby, when an abnormality occurs in the rectangular secondary battery 100 and the internal pressure increases to a certain level or more, the bending portion 130 breaks first, and the gas generated inside each type of secondary battery 100 is discharged.

[0071] And the embodiments of FIGS. 16 and 17 relate to a two-way secondary battery in which the positive electrode terminal 122 and the negative electrode terminal 124 are respectively disposed on two opposite sides among the first surface 111 to the sixth surface 116, specifically, on both side surfaces of the second surface 112 and the fourth surface 114 in the drawing.

[0072] Such an embodiment has the same basic context as the embodiments of FIGS. 13 to 15 described above. However, since the positive electrode terminal 122 and the negative electrode terminal 124 are respectively disposed on two opposite surfaces of the hexahedron, there is a difference in that the number of surfaces on which the bending portion 130 can be disposed is reduced by one.

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

[0074] That is, as shown in FIG. 16, the bending portion 130 may be disposed on one of the third surfaces 113 at the bottom, or as shown in FIG. 17, the bending portion 130 may be disposed on the first surface 111 corresponding to the upper surface and the third surface 113 which is the bottom surface located on the opposite side thereof, respectively.

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

Industrial Applicability

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

[0077] Furthermore, it is also preferable that the present invention includes the following examples. [1] A battery case having a hexahedral shape, a positive electrode terminal and a negative electrode terminal that are disposed together on any one of the six surfaces of the battery case or are respectively disposed on any two surfaces, a bending 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 that is electrically connected to the electrode terminal disposed on the same surface as the bending portion and is exposed on any one surface excluding the surface provided with the bending portion, A prismatic secondary battery including the above. [2] The terminal structure includes a terminal body that binds to one or more surfaces of the battery case while wrapping so that the electrode terminal is not exposed, and the extension terminal. The prismatic secondary battery according to [1]. [3] The extension wiring that electrically connects the extension terminal to the electrode terminal is not exposed outside the terminal body. The prismatic secondary battery according to [2]. [4] The extension wiring that electrically connects the extension terminal to the electrode terminal is insulated from the outside, the rectangular secondary battery according to [2]. [5] The positive electrode terminal, the negative electrode terminal, and the bending portion are all arranged 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 respectively exposed on both side surfaces of the battery case located on opposite sides of each other, the rectangular secondary battery according to any one of [1] to [4]. [6] The positive electrode terminal, the negative electrode terminal, and the bending portion are all arranged 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 the front surface or the rear surface of the battery case located on opposite sides of each other, the rectangular secondary battery according to any one of [1] to [4]. [7] The extension terminals of the pair of terminal structures are arranged together on either the front surface or the rear surface of the battery case, or one is arranged on each of the front surface and the rear surface of the battery case, the rectangular secondary battery according to [6]. [8] The positive electrode terminal, the negative electrode terminal, and the bending portion are all arranged 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 respectively exposed on either one of both side surfaces of the battery case located on opposite sides of each other and either one of the front surface and the rear surface, the rectangular secondary battery according to any one of [1] to [4]. [9] The positive electrode terminal, the negative electrode terminal, and the bending portion are all arranged 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 respectively exposed on the bottom surface of the battery case, the rectangular secondary battery according to any one of [1] to [4].

[10] The positive electrode terminal and the negative electrode terminal are respectively arranged on both side surfaces of the battery case, and the bending portion is arranged on at least one of the both side surfaces 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 respectively exposed on the upper surface of the battery case, and the prismatic secondary battery according to any one of [1] to [4].

[11] The positive electrode terminal and the negative electrode terminal are respectively arranged on both side surfaces of the battery case, and the bending portion is arranged on at least one of the both side surfaces 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 respectively exposed on the front surface or the rear surface of the battery case, and the prismatic secondary battery according to any one of [1] to [4].

[12] The extension terminals of the pair of terminal structures are arranged together on either the front surface or the rear surface of the battery case, or one is arranged on each of the front surface and the rear surface of the battery case, and the prismatic secondary battery according to

[11] .

[13] The positive electrode terminal and the negative electrode terminal are respectively arranged on both side surfaces of the battery case, and the bending portion is arranged on at least one of the both side surfaces 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 respectively exposed on either the upper surface or one of the front and rear surfaces of the battery case, and the prismatic secondary battery according to any one of [1] to [4].

[14] The positive electrode terminal and the negative electrode terminal are respectively arranged on both side surfaces of the battery case, and the bending portion is arranged on at least one of the both side surfaces 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 respectively exposed on the bottom surface of the battery case, and the prismatic secondary battery according to any one of [1] to [4].

[15] In a rectangular secondary battery in which six planes of the first plane to the sixth plane form a hexahedral shape, at least one of the first plane to the sixth plane is provided with a positive electrode terminal and a negative electrode terminal, and a bending portion is provided on at least one of the remaining planes excluding the plane on which the positive electrode terminal and the negative electrode terminal are provided. A rectangular secondary battery.

[16] The positive electrode terminal and the negative electrode terminal are both arranged on one of the first plane to the sixth plane. The rectangular secondary battery according to

[15] .

[17] The rectangular secondary battery has a cuboid shape, The positive electrode terminal and the negative electrode terminal are both arranged on one of the planes excluding the plane with the largest area. The rectangular secondary battery according to

[16] .

[18] The bending portion is arranged on at least one of the remaining three planes excluding the two planes with the largest area and located on opposite sides of each other. The rectangular secondary battery according to

[17] .

[19] The positive electrode terminal and the negative electrode terminal are respectively arranged on two planes located on opposite sides of each other among the first plane to the sixth plane. The rectangular secondary battery according to

[15] .

[20] The rectangular secondary battery has a cuboid shape, The positive electrode terminal and the negative electrode terminal are respectively arranged on two planes located on opposite sides of each other excluding the plane with the largest area. The rectangular secondary battery according to

[19] .

Explanation of symbols

[0078] 100: Rectangular secondary battery 110: Battery case 111: First plane 112: Second plane 113: Third plane 114: Fourth plane 115: Fifth plane 116: Sixth plane 120: Electrode terminal 122: Positive electrode terminal 124: Negative electrode terminal 130: Bending portion 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 that are either disposed together on any one of the six faces of the battery case or disposed on any two faces respectively, a bending portion provided on the same face as at least one of the positive electrode terminal and the negative electrode terminal, a terminal structure including an extension terminal that is electrically connected to the electrode terminal disposed on the same face as the bending portion and is exposed on any one face excluding the face provided with the bending portion, including, the terminal structure is a prismatic secondary battery that prevents the electrode terminal from operating on the same face as the bending portion.

2. The positive electrode terminal, the negative electrode terminal, and the bending 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 respectively exposed on both side faces of the battery case located on opposite sides of each other. The prismatic secondary battery according to Claim 1.

3. The positive electrode terminal, the negative electrode terminal, and the bending 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 the front face or the rear face of the battery case located on opposite sides of each other. The prismatic secondary battery according to Claim 1.

4. The extension terminals of the pair of terminal structures are either disposed together on any one of the front face or the rear face of the battery case, or one is disposed on each of the front face and the rear face of the battery case. The prismatic secondary battery according to Claim 3.

5. The positive electrode terminal, the negative electrode terminal, and the bending 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 respectively exposed on any one of both side faces of the battery case located on opposite sides of each other and any one of the front face and the rear face. The prismatic secondary battery according to Claim 1.

6. The positive electrode terminal, the negative electrode terminal, and the bending 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 respectively exposed on the bottom surface of the battery case. The prismatic secondary battery according to Claim 1.

7. The positive electrode terminal and the negative electrode terminal are respectively arranged on both side surfaces of the battery case, and the bending portion is arranged on at least one of the both side surfaces of the battery case. The rectangular secondary battery according to claim 1, wherein a pair of terminal structures is electrically connected to the positive electrode terminal and the negative electrode terminal respectively, and the extension terminals are respectively exposed on the upper surface of the battery case.

8. The positive electrode terminal and the negative electrode terminal are respectively arranged on both side surfaces of the battery case, and the bending portion is arranged on at least one of the both side surfaces of the battery case. The rectangular secondary battery according to claim 1, wherein a pair of terminal structures is electrically connected to the positive electrode terminal and the negative electrode terminal respectively, and the extension terminals are respectively exposed on the front surface or the rear surface of the battery case.

9. The rectangular secondary battery according to claim 8, wherein the extension terminals of the pair of terminal structures are arranged together on one of the front surface or the rear surface of the battery case, or one is arranged on the front surface and the other is arranged on the rear surface of the battery case respectively.

10. The positive electrode terminal and the negative electrode terminal are respectively arranged on both side surfaces of the battery case, and the bending portion is arranged on at least one of the both side surfaces of the battery case. The rectangular secondary battery according to claim 1, wherein a pair of terminal structures is electrically connected to the positive electrode terminal and the negative electrode terminal respectively, and the extension terminals are respectively exposed on one of the upper surface and the front and rear surfaces of the battery case.

11. The positive electrode terminal and the negative electrode terminal are respectively arranged on both side surfaces of the battery case, and the bending portion is arranged on at least one of the both side surfaces of the battery case. The rectangular secondary battery according to claim 1, wherein a pair of terminal structures is electrically connected to the positive electrode terminal and the negative electrode terminal respectively, and the extension terminals are respectively exposed on the bottom surface of the battery case.

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