Rechargeable batteries, battery modules, and devices that use rechargeable batteries as a power source.

Abstract

To provide a secondary battery which achieves reduction of a possibility that a short circuit occurs in an electrode assembly and achieves improvement of use safety, and to provide a battery module and a device which uses the secondary battery as a power source.SOLUTION: A secondary battery 30 includes a case 31 and a top cover 32 connected to the case. The case has an end provided with an opening. The top cover covers the opening of the case. The top cover includes an insertion part to be inserted into the case through the opening. A plurality of cutouts are provided on an inner surface of the end of the case or a side wall, which faces the case, of the insertion part.SELECTED DRAWING: Figure 4

Description

Technical Field

[0006]

[0001] This application claims the priority of Chinese Patent Application No. 202020916363.0, titled "Secondary Battery, Battery Module, and Device Using the Secondary Battery as a Power Source", filed on May 27, 2020, and all the contents of the application are incorporated herein by reference.

[0002] This application relates to the technical field of batteries, and particularly to secondary batteries, battery modules, and devices using secondary batteries as a power source.

Background Art

[0003] With the development of science and technology, the application fields of rechargeable secondary batteries are becoming increasingly wide. For example, secondary batteries can be applied to automobiles, electric bicycles, or wireless power tools, etc. A secondary battery includes a housing and an electrode assembly enclosed within the housing. A plurality of secondary batteries are housed in a housing, but in the process of using the secondary battery, a short-circuit problem of the secondary battery occurs, which affects the use safety of the secondary battery.

Summary of the Invention

[0004] [[ID=2二]]] This application provides a secondary battery, a battery module, and a device using the secondary battery as a power source. The secondary battery can reduce the possibility of short-circuit of the electrode assembly and improve the use safety of the secondary battery.

[0005] In one aspect, this application provides a secondary battery including a case and a top cover connected to the case. The case has an end portion provided with an opening. The top cover covers the opening of the case. The top cover includes an insertion portion inserted into the case from the opening. Here, the inner surface of the end portion of the case or the side wall of the insertion portion facing the case has a plurality of cutouts. This application provides a secondary battery including a case and a top cover connected to the case. The case has an end portion provided with an opening. The top cover covers the opening of the case. The top cover includes an insertion portion inserted into the case from the opening. Here, the inner surface of the end portion of the case or the side wall of the insertion portion facing the case has a plurality of cutouts.

[0006] According to an embodiment according to one aspect of this application, the secondary battery further includes an electrode assembly mounted in the case and an insulating member. The insulating member is mounted on the top cover to separate the top cover from the electrode assembly. The minimum thickness of the insulating material protruding from the top cover along the axial direction of the opening is greater than the maximum distance between each adjacent notch, and / or the minimum thickness of the insulating material protruding from the top cover along the axial direction of the opening is greater than the maximum thickness of the insertion portion in the axial direction of the opening.

[0007] According to one embodiment of one aspect of the present application, the insulating member comprises a ring portion provided around the edge of the insertion portion, and the secondary battery further includes an insulating sheet covering the electrode assembly, the insulating sheet extending between the ring portion and the case.

[0008] According to one embodiment relating to one aspect of the present application, at least a portion of the side wall of the insertion portion is a smooth curved surface or an inclined surface that slopes toward the center of the opening.

[0009] According to one embodiment relating to one aspect of the present application, the shape of each notch is the same.

[0010] According to one embodiment of one aspect of the present application, each notch is uniformly distributed along the circumferential direction of the opening at the end of the insertion portion or case.

[0011] According to one embodiment of one aspect of the present application, the top cover further comprises a dish-shaped portion, the insertion portion protrudes from the end face of the dish-shaped portion, and the outer edge of the dish-shaped portion extends from the insertion portion and is connected and fixed to the end.

[0012] According to one embodiment of one aspect of the present application, the insertion portion has an annular surface connected to the dish portion, a notch is provided on the side of the annular surface away from the dish portion, and the orthogonal projection of the end face of the end portion is located within the annular surface along the radial direction of the opening.

[0013] According to one embodiment of one aspect of the present application, the dish portion is sealed and connected to the end of the case.

[0014] According to one embodiment of one aspect of the present application, the dish portion and the end of the case are connected and fixed by welding.

[0015] According to one embodiment of one aspect of the present application, a notch is provided on the inner surface of the end, and the size of the notch in the axial direction of the opening is smaller than the thickness of the insertion part inserted into the opening.

[0016] In the secondary battery according to the embodiment of the present invention, a notch is provided on the inner surface of the end of the case or on the side wall facing the case at the insertion part of the top cover. As a result, the insertion part of the top cover and the end of the case are less likely to come into contact with each other due to the notch, thereby reducing the area in which the insertion part of the top cover and the end of the case come into contact and rub against each other. In the process of assembling the top cover and the case, if the insertion part of the top cover and the end of the case rub against each other in the contact area, the possibility of generating small or large filamentous metal scraps that have fallen off from the insertion part of the top cover or the case is effectively reduced. In this way, by generating a small number or small size of filamentous metal scraps during the assembly process of the case and the top cover, the possibility of a short circuit occurring between the first electrode sheet and the second electrode sheet of the secondary battery due to overlapping filamentous metal scraps is effectively reduced, improving the safety of use of the secondary battery.

[0017] In another embodiment, the present application provides a battery module which, The casing and The device includes the above-mentioned secondary battery located inside the casing.

[0018] In yet another embodiment, the present invention provides a device that uses a secondary battery as a power source, which comprises the above-mentioned secondary battery for supplying electrical energy. [Brief explanation of the drawing]

[0019] The features, advantages, and technical effects of exemplary embodiments of the present application will be described below with reference to the drawings. In the drawings, the figures are not necessarily drawn to actual proportions. [Figure 1] This is a schematic diagram of the structure of a vehicle disclosed in one embodiment of the present application. [Figure 2] It is a schematic structural view of a battery module disclosed in one embodiment of the present application. [Figure 3] It is a schematic exploded view of the battery module of the embodiment shown in FIG. 2. [Figure 4] It is a schematic exploded view of a secondary battery disclosed in one embodiment of the present application. [Figure 5] It is a schematic structural view of a case disclosed in one embodiment of the present application. [Figure 6] It is an enlarged view of portion A in FIG. 5. [Figure 7] It is a schematic structural view of a top cover disclosed in an embodiment of the present application. [Figure 8] It is a schematic cross-sectional view of a secondary battery disclosed in one embodiment of the present application. [Figure 9] It is an enlarged view of portion B in FIG. 8. [Figure 10] It is an enlarged view of portion C in FIG. 9. [Figure 11] It is a schematic partial cross-sectional view of a secondary battery disclosed in another embodiment of the present application.

Description of Reference Numerals

[0020] 1 Vehicle 10 Battery module 20 Housing ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​ 50 Top cover 60 Lower cover 99 Notches X-axis direction Y circumferential direction [Modes for carrying out the invention]

[0021] Embodiments of the present application will be described in more detail below with reference to the drawings and examples. The detailed description of the following embodiments and the drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application. That is, the present application is not limited to the embodiments described.

[0022] In this description, unless otherwise specified, "multiple" means two or more. The indicated directions or positional relationships of terms such as "up," "down," "left," "right," "inside," and "outside" are merely for the purpose of easily explaining and simplifying this description, and do not indicate or imply that the specified device or element has a specific direction, or must be composed of and operated in a specific direction, and therefore should not be understood as limiting this description. Also, terms such as "first," "second," and "third" are used simply to describe the subject, and should not be understood as indicating or implying relative importance. "Perpendicular" does not mean perpendicular in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range.

[0023] All directional terms appearing in the following description refer to the directions shown in the diagrams and do not limit the specific structure of the present application. Furthermore, in this description, unless otherwise explicitly stated or limited, the terms “attachment,” “connection,” and “connection” should be understood in a broad sense. For example, they may be fixed connections, removable connections, or integral connections. They may be directly connected or indirectly connected via an intermediate medium. Those skilled in the art will be able to understand the specific meaning of these terms in this application depending on the specific circumstances.

[0024] In conventional technology, when a short-circuit problem occurred in a secondary battery, the applicant studied and analyzed the structure of the secondary battery and discovered that filamentous metal debris remained inside after the assembly of the secondary battery was completed. This filamentous metal debris causes short circuits in the secondary battery. The applicant aimed to reduce the possibility of metal debris generation by optimizing the processing and manufacturing processes and assembly environment of each component of the secondary battery. However, the short-circuit phenomenon still existed in secondary batteries, and the proportion of secondary batteries with problems did not significantly decrease. The applicant further analyzed and studied the assembly process of the secondary battery. Finally, the applicant discovered that the top cover and case of the secondary battery are prone to generating filamentous metal debris during the assembly process. During the assembly process of the top cover and case, there are situations where the top cover rubs against the inner wall of the case, and / or the case rubs against the outer wall of the top cover, and when these rub against each other, filamentous metal debris is generated. Because the size of the filamentous metal debris is long, it is likely to cause short circuits in the secondary battery after assembly.

[0025] Based on the above-mentioned problems discovered by the applicant, the applicant has improved the structure of the secondary battery, and embodiments of the present application are further described below.

[0026] To better understand this application, it will be explained below with reference to Figures 1 to 11.

[0027] As shown in Figure 1, an embodiment of the present invention provides a device that uses a battery module as a power source. The device may be, but is not limited to, a vehicle, a ship, an aircraft, or a power tool. One embodiment of the present invention provides a vehicle 1 comprising a vehicle body and a battery module 10. The battery module 10 is provided in the vehicle body. Here, the vehicle 1 may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. The vehicle body is provided with a drive motor electrically connected to the battery module 10. The battery module 10 supplies electrical energy to the drive motor. The drive motor is connected to the wheels on the vehicle body by a transmission mechanism, thereby driving the vehicle to move. If necessary, the battery module 10 may be provided horizontally at the bottom of the vehicle body.

[0028] In one embodiment of the present invention, as shown in Figures 2 and 3, the battery module 10 comprises a housing 20, a secondary battery 30, insulating spacers 40, an upper cover 50, and a lower cover 60. The number of secondary batteries 30 provided in the housing 20 may be multiple. Multiple secondary batteries 30 are connected to each other in series or parallel via busbars. The housing 20 has a cylindrical structure and has two opposing openings. The secondary battery 30 is housed in the housing 20 through one of the openings. The upper cover 50 and the lower cover 60 are provided at opposite ends of the housing 20, respectively, and close the corresponding openings. Insulating spacers 40 are provided between the upper cover 50 and the secondary battery 30, and / or between the lower cover 60 and the secondary battery 30. Insulating spacers 40 are provided between the upper cover 50 and the secondary battery 30 and between the lower cover 60 and the secondary battery 30 as needed. The two insulating spacers 40 are spaced apart in the axial direction of the secondary battery 30. The two insulating spacers 40 are provided corresponding to the two ends of the secondary battery 30, and the ends can press the secondary battery 30 in the axial direction, thereby restricting the axial movement of the secondary battery 30. The insulating spacers 40 can insulate and separate the secondary battery 30 from other adjacent structural members, such as busbars, circuit boards, or wire harnesses, thereby improving the safety of use of the secondary battery 30. In one example, the insulating spacers 40 are integrally injection-molded structures. As shown in Figure 2, the housing 20 of the embodiment of the present application has a rectangular structure or other shape. The housing 20 can be manufactured from materials such as aluminum, aluminum alloy, or plastic.

[0029] As shown in Figure 4, the secondary battery 30 comprises a case 31, an electrode assembly 33 provided inside the case 31, a top cover 32 sealed and connected to the case 31, electrode terminals 34 and a relay member 35 provided on the top cover 32.

[0030] As shown in Figure 5, the case 31 of one embodiment of the present application has a housing hole 31a for housing the electrode assembly 33 and an opening 31b communicating with the housing hole 31a. The case 31 has opposing ends 311. The opening 31b of the case 31 is provided at the end 311. In one example, the case 31 is a cylindrical structure with one end open or a cylindrical structure with both ends open. To understand this, the case 31 may be rectangular or of other shapes. The case 31 can be manufactured from a material such as aluminum or an aluminum alloy.

[0031] The electrode assembly 33 in this embodiment can be formed by winding together a first electrode sheet, a second electrode sheet, and a separator located between the first and second electrode sheets, where the separator is an insulator interposed between the first and second electrode sheets. In this embodiment, the first electrode sheet is described as the positive electrode sheet and the second electrode sheet as the negative electrode sheet. The positive electrode sheet active material is applied to the coated area of ​​the positive electrode sheet, and the negative electrode sheet active material is applied to the coated area of ​​the negative electrode sheet. Multiple uncoated areas extending from the coated area of ​​the main body are stacked to form a tab. The electrode assembly 33 has two tabs, namely a positive electrode tab and a negative electrode tab. The positive electrode tab extends from the coated area of ​​the positive electrode sheet, and the negative electrode tab extends from the coated area of ​​the negative electrode sheet. In this embodiment, tabs extend from both ends of the main body. Tabs of the same polarity and electrode terminals 34 are connected via a relay member 35.

[0032] In the embodiment of the present application, the top cover 32 is used to cover the opening 31b of the case 31. As shown in Figure 7, the top cover 32 has an insertion portion 321 for insertion into the case 31 from the opening 31b of the case 31. When assembling the top cover 32 and the case 31, it is necessary to insert the insertion portion 321 of the top cover 32 into the case 31. The insertion portion 321 has a side wall 3211 facing the inner wall of the case 31. The top cover 32 has an electrode lead-out hole (not shown). The electrode terminal 34 covers the electrode lead-out hole and is connected to the top cover 32. In the embodiment of the present application, as shown in Figure 6, the inner surface of the end portion 311 of the case 31 has a plurality of notches 99. Alternatively, as shown in Figure 7, the side wall 3211 of the insertion portion 321 of the top cover 32 facing the case 31 has a plurality of notches 99. In this way, the inner edge of the end portion 311 of the case 31 or the edge of the insertion portion 321 of the top cover 32 is given a discontinuous tooth-shaped edge structure. A single tooth is formed between two adjacent notches 99.

[0033] In the secondary battery 30 of the embodiment of the present invention, a notch 99 is provided on the inner surface of the end portion 311 of the case 31 or on the side wall 3211 of the insertion portion 321 of the top cover 32 facing the case 31. As a result, the insertion portion 321 of the top cover 32 and the end portion 311 of the case 31 are less likely to come into contact with each other at the notch 99, thereby reducing the area in which the insertion portion 321 of the top cover 32 and the end portion 311 of the case 31 come into contact and rub against each other. If rubbing occurs in the contact area between the insertion portion 321 of the top cover 32 and the end portion 311 of the case 31 during the assembly process of the top cover 32 and the case 31, the size of the filamentous metal scraps that fall off and form on the insertion portion 321 of the top cover 32 or the case 31 is reduced, effectively decreasing the possibility of filamentous metal scraps being generated that are either small or large in size. In this way, the assembly process between the case 31 and the top cover 32 generates a small number or small amount of thread-like metal scraps, effectively reducing the possibility of a short circuit between the first electrode sheet and the second electrode sheet of the secondary battery 30 due to overlapping thread-like metal scraps, thereby improving the safety of use of the secondary battery 30.

[0034] In one embodiment, as shown in Figure 7, at least a portion of the side walls 3211 of the insertion portion 321 is a smooth curved surface or a slope that inclins toward the center of the opening 31b, thereby reducing the sharpness of at least a portion of the side walls 3211 of the insertion portion 321, which helps to reduce the stress on the side walls 3211 of the insertion portion 321 that rub against the inner wall of the case 31, and reduces the possibility of contact and friction between the insertion portion 321 and the case 31 that generates filamentous metal shavings.

[0035] In one embodiment, the shape of each notch 99 is the same, thereby improving the ease of machining the notches 99 and the consistency of the machining process, which helps to reduce the difficulty of machining the top cover 32 or the case 31. Each notch 99 is uniformly distributed along the circumferential direction Y of the opening 31b to the end 311 of the insertion portion 321 or the case 31.

[0036] In one embodiment, as shown in Figures 4, 8, and 9, the secondary battery 30 further comprises an insulating member 36. The insulating member 36 is attached to the top cover 32 and is used to separate the top cover 32 from the electrode assembly 33. One end of the insulating member 36 away from the top cover 32 abuts against the electrode assembly 33, thereby limiting the position of the electrode assembly 33 and reducing its movement within the case 31 along the axial direction X of the opening 31b of the case 31. The axial direction X of the opening 31b is the same as the axial direction of the housing hole 31a. If necessary, the material of the insulating member 36 is an insulating material such as rubber or plastic. In one example, the maximum distance between each adjacent notch 99 determines the maximum size of the filamentous metal scrap. The maximum distance between each adjacent notch 99 may be the maximum size measured along the circumferential direction Y of the opening 31b. The minimum thickness of the opening 31b of the insulating member 36 protruding from the top cover 32 along the axial X is greater than the maximum distance between each adjacent notch 99, thereby the minimum thickness of the opening 31b of the insulating member 36 protruding from the top cover 32 along the axial X is greater than the maximum size of filamentous metal scrap that can be generated between the top cover 32 and the case 31, and furthermore, filamentous metal scrap is less likely to enter between the insulating member 36 and the electrode assembly 33, thus reducing the possibility of a short circuit between the first electrode sheet and the second electrode sheet of the electrode assembly 33 due to overlapping of filamentous metal scrap onto the first electrode sheet and the second electrode sheet. In another example, the maximum thickness of the opening 31b of the insertion portion 321 along the axial X determines the maximum size of filamentous metal scrap along the axial X of the opening 31b. The minimum thickness of the insulating member 36 protruding from the top cover 32 along the axial X of the opening 31b is greater than the maximum thickness of the opening 31b of the insertion portion 321 of the top cover 32 along the axial X. As a result, the minimum thickness of the insulating member 36 protruding from the top cover 32 along the axial X of the opening 31b is greater than the maximum size of the filamentous metal scrap that can be generated between the top cover 32 and the case 31 along the axial X of the opening 31b. Furthermore, it is difficult for the filamentous metal scrap to enter between the insulating member 36 and the electrode assembly 33, thus reducing the possibility of a short circuit between the first electrode sheet and the second electrode sheet of the electrode assembly 33 due to overlapping of filamentous metal scrap.Preferably, the minimum thickness of the insulating member 36 protruding from the top cover 32 along the axial X of the opening 31b is greater than the maximum distance between each adjacent notch 99, and the minimum thickness of the insulating member 36 protruding from the top cover 32 along the axial X of the opening 31b is greater than the maximum thickness of the insertion portion 321 of the top cover 32 along the axial X of the opening 31b.

[0037] In one example, as shown in Figure 10, the insulating member 36 includes a ring portion 361 provided around the edge of the insertion portion 321. The secondary battery 30 includes an insulating sheet 37 covering the electrode assembly 33. The insulating sheet 37 is wound in the circumferential direction Y of the opening 31b to form a cylindrical structure. The insulating sheet 37 extends between the ring portion 361 and the case 31. The portion of the insulating sheet 37 located between the ring portion 361 and the case 31 can provide protection against filamentous metal debris, helping to prevent filamentous metal debris from entering between the insulating member 36 and the electrode assembly 33, and further reducing the possibility of the electrode assembly 33 short-circuiting due to filamentous metal debris entering between the insulating member 36 and the electrode assembly 33.

[0038] In one embodiment, as shown in Figures 7 and 10, the top cover 32 further comprises a dish-shaped portion 322. The insertion portion 321 protrudes from the end face of the dish-shaped portion 322 facing the electrode assembly 33. The diameter of the dish-shaped portion 322 is larger than the diameter of the insertion portion 321. The outer edge of the dish-shaped portion 322 extends from the insertion portion 321 and is connected and fixed to the end portion 311 of the case 31. The dish-shaped portion 322 of the top cover 32 is sealed to the end portion 311 of the case 31. In one example, the dish-shaped portion 322 of the top cover 32 and the end portion 311 of the case 31 are connected and fixed by welding. If necessary, the welding method may be laser welding or hot melt welding.

[0039] In one embodiment, as shown in Figure 10, a notch 99 is provided in the insertion portion 321 of the top cover 32. The insertion portion 321 has an annular surface 3212 connected to the dish portion 322. The notch 99 is provided on the side of the annular surface 3212 away from the dish portion 322. Along the radial direction of the opening 31b, the end portion 311 of the case 31 has an end surface 311a corresponding to the position of the annular surface 3212 of the insertion portion 321. The radial direction of the opening 31b is perpendicular to the axial direction X of the opening 31b. Along the radial direction of the opening 31b, the orthographic projection of the end surface 311a of the end portion 311 lies within the orthographic projection of the annular surface 3212. In an embodiment in which the dish-shaped portion 322 and the end portion 311 of the case 31 are connected and fixed by laser welding, the portion of the insertion portion 321 corresponding to the annular surface 3212 can block the laser, which helps to reduce the possibility that the laser will be incident inside the case 31 and irradiate the electrode assembly 33 or other structural members, causing structural damage to the electrode assembly 33 or other structural members.

[0040] In one embodiment, as shown in Figure 11, a notch 99 is provided on the inner surface of the end portion 311. The size of the notch 99 along the axial direction X of the opening 31b is smaller than the thickness of the insertion portion 321 inserted into the opening 31b. After the insertion portion 321 is inserted into the case 31, the insertion portion 321 can cover the entire notch 99, thereby preventing metal slag generated when the dish portion 322 of the top cover 32 and the end portion 311 of the case 31 are welded together from the notch 99 into the case 31, and helping to reduce the possibility of the metal slag piercing the separator of the electrode assembly 33 and causing a short circuit between the first electrode sheet and the second electrode sheet.

[0041] The secondary battery 30 of the embodiment of the present invention comprises a case 31 and a top cover 32 connected to and fixed to the case 31. Multiple notches 99 are provided on the inner surface of the end portion 311 of the case 31 or on the side wall 3211 of the insertion portion 321 of the top cover 32 facing the case 31. Because the notches 99 are provided on the inner surface of the end portion 311 of the case 31 or on the side wall 3211 of the insertion portion 321, the area in contact between the top cover 32 and the case 31 is reduced during the assembly process of the top cover 32 and the case 31, thereby reducing the area in which the insertion portion 321 and the case 31 rub against each other. Furthermore, the assembly process of the case 31 and the top cover 32 generates a small number or small size of thread-like metal scraps, effectively reducing the possibility of a short circuit between the first electrode sheet and the second electrode sheet of the secondary battery 30 due to overlapping thread-like metal scraps, and improving the safety of use of the secondary battery 30.

[0042] While the present application has been described with reference to preferred embodiments, various improvements can be made thereto without departing from the scope of the application, and components therein can be replaced with equivalents. In particular, any technical feature mentioned in each embodiment can be combined in any way, provided that no structural conflicts exist. The present application is not limited to the specific embodiments disclosed herein, but includes all technical proposals that fall within the scope of the claims.

Claims

1. A case having an end with an opening, The case comprises an insertion portion that is inserted into the case from the opening, and a top cover that covers the opening of the case, The inner surface of the end of the case or the side wall of the insertion portion facing the case has a plurality of notches, The case further comprises an electrode assembly mounted inside the case, and an insulating member attached to the top cover that separates the top cover from the electrode assembly. The insulating member comprises a ring portion provided around the edge of the insertion portion, The electrode assembly is further provided with an insulating sheet covering it, the insulating sheet extending between the ring portion and the case, The axial size of the opening of the notch provided on the inner surface of the end is smaller than the thickness of the insertion portion inserted into the opening. The top cover further comprises a dish-shaped portion, the insertion portion protruding from the end face of the dish-shaped portion, and the outer edge of the dish-shaped portion extending from the insertion portion and connected and fixed to the end, forming a secondary battery.

2. The secondary battery according to claim 1, wherein at least a portion of the side wall of the insertion portion is an inclined surface that slopes toward the center of the opening.

3. The secondary battery according to claim 1 or 2, wherein the shape of each of the aforementioned notches is the same.

4. The secondary battery according to any one of claims 1 to 3, wherein each of the aforementioned notches is uniformly distributed along the circumferential direction of the opening to the end of the insertion portion or the case.

5. The secondary battery according to any one of claims 1 to 4, wherein the insertion portion has an annular surface connected to the dish portion, the notch is provided on the side of the annular surface away from the dish portion, and the orthographic projection of the end face of the end portion is located within the annular surface along the radial direction of the opening.

6. The secondary battery according to any one of claims 1 to 5, wherein the dish portion is sealed and connected to the end of the case.

7. The secondary battery according to any one of claims 1 to 6, wherein the dish portion and the end portion of the case are connected and fixed by welding.

8. The casing and A secondary battery according to any one of claims 1 to 7 provided inside the housing, A battery module equipped with the following features.

9. A device that uses a secondary battery as a power source, A device comprising a secondary battery according to any one of claims 1 to 7 for supplying electrical energy.

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