Battery module, method of manufacturing battery module, and electronic device

Abstract

The present disclosure is a battery module, a method of manufacturing a battery module, and an electronic device. A battery module having high impact resistance is provided. A battery module using an elastic body such as rubber as an outer packaging body covering a battery is provided. A bendable battery module is provided. An elastic body such as rubber is used as an outer packaging body covering a battery, and the forming of the outer packaging body is performed in two processes. First, the forming of a first part provided with a recess that accommodates a battery is performed using a first mold. Next, the battery is inserted into the first part. Next, a second part is formed by performing second forming using a second mold in a manner that fills the opening of the recess of the first part. The second part is used as a cover that covers the opening of the recess of the first part. The second part is formed in a manner that contacts a portion of an electrode of the battery and a portion of an end of a second outer packaging body of the battery.

Description

Technical Field

[0001] One embodiment of the present invention relates to a battery. One embodiment of the present invention relates to a battery module including a battery. One embodiment of the present invention relates to a battery that can be installed in an electronic device. One embodiment of the present invention relates to a battery-powered electronic device.

[0002] Note that one embodiment of the present invention is not limited to the above-described technical fields. Examples of technical fields related to one embodiment of the present invention disclosed in this specification include semiconductor devices, display devices, light-emitting devices, energy storage devices, memory devices, electronic devices, lighting devices, input devices, input / output devices, driving methods thereof, and manufacturing methods thereof. Background Technology

[0003] Development of portable information terminal devices, such as smartphones and tablets, is active. These electronic devices are required to be lightweight and compact.

[0004] In particular, the development of wearable electronic devices (also known as wearable devices) has been active in recent years. Examples of wearable devices include wristwatches, head-mounted glasses or goggles, and necklaces. For example, wristwatches include a small display that replaces the watch face in a traditional watch, thus providing users with various information beyond just the time. As for the applications of such wearable devices, their use in medical care, health self-management, and other areas has garnered attention, leading to their practical development.

[0005] Portable devices mostly include rechargeable batteries that can be repeatedly charged and discharged. In particular, wearable devices include small rechargeable batteries, which are therefore required to be small, lightweight, and capable of long-term use.

[0006] For example, Patent Document 1 discloses a wearable device that uses a film as its outer packaging and includes a flexible secondary battery.

[0007] [References]

[0008] [Patent Literature]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 2015-038868 Summary of the Invention

[0010] When the outer packaging of a secondary battery is damaged, it may cause overheating or fire. Therefore, even when a film is used as the outer packaging, a relatively rigid outer packaging is generally used to cover the secondary battery. However, this structure does not consider the possibility of deformation of the secondary battery due to bending or other reasons. When the secondary battery is installed in an electronic device, there is a problem of limiting the placement of the secondary battery.

[0011] One objective of one embodiment of the present invention is to provide a battery module that is highly impact-resistant and can be installed on or connected to electronic devices.

[0012] Another object of one embodiment of the present invention is to provide a battery module that uses an elastomer such as rubber as the outer packaging body covering the battery. Another object of one embodiment of the present invention is to provide a flexible battery module.

[0013] Another object of one embodiment of the present invention is to provide a battery module that can be used as a wearable member of an electronic device. Another object of one embodiment of the present invention is to provide a battery module that can be used as a flexible wearable member.

[0014] Another object of one embodiment of the present invention is to provide a battery module that suppresses problems such as damage caused by excessive bending of the battery. Another object of one embodiment of the present invention is to provide a battery module with a limited bending range.

[0015] Another objective of one embodiment of the present invention is to provide an electronic device capable of long-term use. Another objective of one embodiment of the present invention is to provide a highly designable electronic device or battery module, etc. Another objective of one embodiment of the present invention is to provide a battery module that can be easily installed and removed from an electronic device. Another objective of one embodiment of the present invention is to provide a highly waterproof electronic device or battery module. Another objective of one embodiment of the present invention is to provide a novel battery module or a novel electronic device.

[0016] Another object of one embodiment of the present invention is to provide an electronic component or a module including an electronic component with high impact resistance.

[0017] One embodiment of the present invention is a battery module including a first outer casing and a battery. The battery includes a second outer casing, a positive electrode, a negative electrode, an electrolyte, and a pair of tabs. The positive electrode, negative electrode, and electrolyte are located within the second outer casing. The pair of tabs are disposed such that they protrude to the outside of the second outer casing. The first outer casing comprises a resilient material. The first outer casing includes a first portion, a second portion, and a space surrounded by the first and second portions. The second outer casing is disposed within the aforementioned space. The first portion and the second portion are joined together. The second portion contacts a portion of the tabs and an end of the second outer casing.

[0018] In the above structure, it is preferred that the first part and the second part contain the same material, and the first part and the second part are directly joined together.

[0019] In the above structure, the volume or surface area of ​​the second part is preferably smaller than that of the first part.

[0020] In the above structure, the second outer packaging body is preferably in the form of a film, and when the first outer packaging body deforms, the second outer packaging body preferably deforms along with the first outer packaging body.

[0021] In the above structure, the first outer packaging body preferably includes a protective member. The protective member preferably has a third portion covering one of two opposing sides of the second outer packaging body and a fourth portion covering the other side. The third and fourth portions are preferably each plate-shaped and deformable with the first outer packaging body.

[0022] The third and fourth parts of the aforementioned protective component are preferably joined together on one side of the second part of the first outer packaging.

[0023] The lengths of the third and fourth parts of the aforementioned protective component are preferably different.

[0024] In the above structure, the first part of the first outer packaging preferably includes a gap in which the third and fourth parts of the protective member are slidably fitted.

[0025] In the above structure, the first outer packaging body is preferably strip-shaped and has a region with a thickness of less than 5 mm.

[0026] In the above structure, the battery module preferably includes a circuit board. The circuit board preferably includes terminals that are electrically connected to the tabs. The second part of the first outer casing is preferably arranged to cover at least a portion of the circuit board and the tabs.

[0027] The circuit board described above preferably includes a protection circuit.

[0028] In the above structure, the battery module preferably includes a frame. The frame preferably contains a material whose rigidity is higher than that of the outer packaging body. The frame preferably includes a first terminal and a second terminal. The first terminal is a terminal electrically connected to a tab, and the second terminal is a terminal electrically connected to the first terminal. A first portion of the first outer packaging body is preferably arranged to cover a portion of the frame and a portion of the first terminal. At least a portion of the second terminal is preferably exposed.

[0029] Another embodiment of the present invention is an electronic device including a frame. The frame preferably has a shape that engages with the aforementioned frame, and includes a third terminal that is electrically connected to the second terminal when the frame engages with the frame.

[0030] Another embodiment of the present invention is a method for manufacturing a battery module including a battery and a first outer casing covering the battery, comprising the following first, second, third, and fourth steps. In the first step, a battery including a second outer casing and a pair of electrodes is prepared. In the second step, a first material is shaped using a first mold to form a first portion having a recess. In the third step, the battery is inserted into the recess from one side of the opening end, such that a portion of the electrode protrudes to the outside of the opening end of the recess. In the fourth step, the first portion with the inserted battery is disposed in a second mold, and a second material is shaped using the second mold to form a second portion sealing the opening end of the recess, thereby forming a first outer casing where the first and second portions are joined together. Here, the second portion is formed to contact the end of the second outer casing, and a portion of the electrode is exposed on the outside of the second portion.

[0031] In the above manufacturing method, each electrode is preferably either a tab protruding from the second outer packaging body or a terminal electrically connected to the tab.

[0032] In the above manufacturing method, the first material and the second material are preferably the same material.

[0033] In the above manufacturing method, it is preferable to use a compound material as the first material and the second material, and to form the first part and the second part by direct compression molding, direct compression injection molding or injection molding.

[0034] Preferably, liquid or paste-like materials are used as the first and second materials, and the first and second parts are formed by injection molding.

[0035] According to one embodiment of the present invention, a battery module with high impact resistance that can be installed on or connected to an electronic device can be provided.

[0036] According to one embodiment of the present invention, a battery module using an elastomer such as rubber as the outer packaging body covering the battery can be provided. According to one embodiment of the present invention, a flexible battery module can be provided.

[0037] According to one embodiment of the present invention, a battery module that can be used as a wearable member of an electronic device can be provided. According to another embodiment of the present invention, a battery module that can be used as a flexible wearable member can be provided.

[0038] One embodiment of the present invention provides a battery module that suppresses problems such as battery damage caused by excessive bending. Another embodiment of the present invention provides a battery module with a limited bending range.

[0039] One embodiment of the present invention provides an electronic device capable of long-term use. One embodiment of the present invention provides a highly design-oriented electronic device or battery module. One embodiment of the present invention provides a battery module that can be easily installed and removed from an electronic device. One embodiment of the present invention provides a highly waterproof electronic device or battery module. One embodiment of the present invention provides a novel battery module or a novel electronic device.

[0040] According to one embodiment of the present invention, an electronic component or a module including an electronic component with high impact resistance can be provided. Attached Figure Description

[0041] Figures 1A to 1E These are diagrams illustrating a structural example of a battery module according to an embodiment and a method for manufacturing a battery module according to an embodiment.

[0042] Figures 2A to 2C These are diagrams illustrating a structural example of a battery module according to an embodiment and a method for manufacturing a battery module according to an embodiment.

[0043] Figures 3A to 3E These are diagrams illustrating a structural example of a battery module according to an embodiment and a method for manufacturing a battery module according to an embodiment.

[0044] Figures 4A to 4C This is a structural example of a battery and battery module according to an implementation method.

[0045] Figure 5A and Figure 5B This is a diagram illustrating a method for manufacturing a battery module according to an embodiment.

[0046] Figures 6A1 to 6A3 , Figure 6B1 , Figure 6B2 , Figure 6C1 and Figure 6C2 This is a structural example of a battery module according to an implementation method.

[0047] Figure 7A1 , Figure 7A2 , Figure 7B1 , Figure 7B2 , Figure 7C1 and Figure 7C2 This is a structural example of a battery module according to an implementation method.

[0048] Figures 8A1 to 8A3 , Figure 8B1 , Figure 8B2 , Figure 8C1 and Figure 8C2 This is a structural example of a battery module according to an implementation method.

[0049] Figures 9A to 9C This is a structural example of a battery module and electronic device according to an implementation method.

[0050] Figures 10A to 10C This is an example of the structure of the frame and electronic device according to the implementation method.

[0051] Figures 11A to 11C This is a diagram illustrating a method for manufacturing a battery module according to an embodiment.

[0052] Figures 12A to 12E This is a diagram illustrating a method for manufacturing a battery module according to an embodiment.

[0053] Figure 13 This is a structural example of a secondary battery according to an embodiment.

[0054] Figure 14A and Figure 14B This is a diagram illustrating a method for manufacturing a secondary battery according to an embodiment.

[0055] Figures 15A to 15C This is a diagram illustrating a method for manufacturing a secondary battery according to an embodiment.

[0056] Figure 16A and Figure 16B This is a diagram illustrating a method for manufacturing a secondary battery according to an embodiment.

[0057] Figure 17A and Figure 17B This is a diagram illustrating an example of the structure and manufacturing method of a secondary battery according to an embodiment.

[0058] Figure 18A and Figure 18B This is a diagram illustrating a method for manufacturing a secondary battery according to an embodiment.

[0059] Figures 19A to 19D This is a structural example of a battery according to an implementation method.

[0060] Figure 20A and Figure 20B This is a photograph of a battery module according to an embodiment. Detailed Implementation

[0061] The embodiments will be described in detail with reference to the accompanying drawings. Note that one embodiment of the present invention is not limited to the following description, and those skilled in the art will readily understand that the manner and details of the invention can be varied in many ways without departing from its spirit and scope. Therefore, the present invention should not be construed as being limited only to the contents described in the embodiments and examples shown below.

[0062] Note that in the structure of the invention described below, the same reference numerals are used in different figures to indicate the same parts or parts having the same function, and repeated descriptions are omitted. Additionally, the same shading lines are used for parts having the same function, and sometimes no special reference numerals are added to those parts.

[0063] Note that in the various figures described in this specification, the size of the constituent elements, the thickness of the layers, and the area are sometimes exaggerated for ease of understanding. Therefore, the size, layer thickness, and area are not limited to the dimensions shown in the figures.

[0064] Note that the ordinal numbers such as "first" and "second" used in this specification are appended to avoid confusion of the constituent elements, and are not intended to limit the number.

[0065] (Implementation Method 1)

[0066] One embodiment of the present invention is a battery module comprising a battery and a first outer packaging body covering the battery.

[0067] The battery includes a positive electrode, a negative electrode, an electrolyte, and a second outer casing covering them. Additionally, the battery includes a pair of tabs. These tabs are electrically connected to the positive and negative electrodes and protrude to the outside of the second outer casing. Both the positive and negative electrodes contain current collectors and active materials. The battery may also include an insulator to prevent short circuits between the positive and negative electrodes. The electrolyte can be either a liquid electrolyte or a solid electrolyte.

[0068] When a thin film material is used as a second outer packaging, the battery can be made flexible.

[0069] The first outer casing is designed to cover the battery and protect it. Using an elastomer such as rubber or a resilient resin as the first outer casing improves the battery module's impact resistance.

[0070] The first outer casing can also have a shape suitable for use as a wearing component in a wearable device. Typically, the first outer casing can have the shape of a watch strap (also called a watch band or wristband) for a watch-type device. Therefore, the battery module can be used as a power source (main power or auxiliary power) for the wearable device.

[0071] At this time, when using metal molds or the like to mold rubber or elastic resin into arbitrary shapes, high pressure needs to be applied to the material. When molding rubber or the like with the structure disposed inside the metal mold, the structure is subjected to large isotropic pressure. Therefore, when the first outer packaging is molded with the battery disposed in the metal mold, the battery may be damaged due to deformation caused by the aforementioned pressure. Thus, especially when using a battery that uses a film as the second outer packaging, it is difficult to mold rubber or the like into the first outer packaging covering the battery.

[0072] Furthermore, when molding rubber and the like, high temperatures are required to soften the material, induce cross-linking reactions, or thermally solidify it. When a battery is placed inside a metal mold, it may deteriorate due to heat. Therefore, it is difficult to mold rubber and the like in a way that covers the battery, not only for batteries that use films as a second outer casing, but also for batteries that use highly rigid materials in the second outer casing.

[0073] In view of the above, in one embodiment of the present invention, the first outer packaging body is formed in two steps (first forming and second forming). First, a first portion having a recess for holding the battery is formed using a first mold (first forming). The shape of the first portion can be described as a bag shape including a pouch portion for holding the battery, and an opening constituting the recess (the pouch portion) is formed. The size of the opening of the recess can be determined taking into account the width and height of the battery, and is preferably as small as possible.

[0074] When a pouch (recess) is pre-formed in the first part and the shape of the opening and the pouch are formed to correspond to the shape of the battery, the battery can be positioned in a predetermined position when inserted, thereby preventing the formed first outer packaging from misaligning with the battery. For example, precise control of the position of the first outer packaging and the battery is particularly important when the battery is bent in one direction.

[0075] Next, insert the battery into the first part. At this time, insert the battery so that a portion of the battery's electrodes (the tabs or the circuit board connected to the tabs, etc.) are located outside the opening of the recess in the first part.

[0076] Next, a second forming process is performed using a second mold to fill the opening of the recess in the first part, thus forming the second part. The second part serves as a cover over the opening of the recess in the first part. The second part contacts a portion of the battery's electrodes and a portion of the end of the battery's second outer casing. During the second forming, it is preferable to form the second part in a manner that avoids the placement of the battery's positive and negative terminals. This prevents pressure on the main body of the battery during the forming of the second part, thereby preventing deformation or damage to the battery. When a film is used as the battery's second outer casing, it is preferable to form the second part in a manner that contacts the sealing portion (also called the top sealing portion) on the battery's tab side and its vicinity.

[0077] When high temperatures are required during the molding of rubber or similar materials, the first outer packaging body is formed in two steps as described above. In this case, the battery is exposed to high temperatures only once in the two steps. Therefore, battery degradation during the molding of the first outer packaging body can be suppressed.

[0078] Therefore, a first outer packaging body with an internal space can be formed. In the first outer packaging body, the first part and the second part are directly joined together. Sometimes a boundary (parting line) is formed between the first part and the second part.

[0079] In the battery module formed in the above manner, the battery and the first outer packaging body are fixed by the second part. That is, the battery is sealed in the first outer packaging body with only a portion of the battery in contact with the second part fixed, while the other parts are not fixed. Since the battery and the first part are not fixed together, the battery and the outer packaging body can deform independently of each other when the first part is bent or deformed. For example, when the battery is joined to the first part, stress is generated in the battery along with the deformation of the first part. On the other hand, in the battery module of one embodiment of the present invention, there is no joint between the battery and the first part of the first outer packaging body, thereby allowing the first outer packaging body to be deformed with less force.

[0080] The following describes in detail a battery module according to one embodiment of the present invention and a method for manufacturing the battery module.

[0081] [Structure Example 1]

[0082] Here, we will use a strip battery module suitable for use in watch-type electronic devices as an example. Note that, of course, various shapes of battery modules can be manufactured according to the shape of the mold in the following description.

[0083] Figure 1A It is used to perform Figure 1EThe diagram shows a cross-sectional view of the mold 50a that forms the first part 21 of the outer packaging 20 of the battery module 10. The mold 50a includes an upper mold 51a, a lower mold 51b, a mold core 53, a mold core 54a, and a mold core 54b. An injection hole 55a for injecting material is provided in the upper mold 51a. Note that in addition to the injection hole 55a, a vent hole is also actually provided in either the upper mold 51a or the lower mold 51b. Sometimes, no vent hole is provided.

[0084] Mold core 53 is a component used to form a recess in the first part 21 after molding. Mold cores 54a and 54b are components used to form through holes in the first part 21 after molding. These mold cores are sometimes also referred to as core cylinders, etc.

[0085] By using Figure 1A The mold 50a shown shapes the material, which can form Figure 1B The first part, 21, is shown.

[0086] As for the molding method described in Part 21, it can be a molding method using solid or semi-solid materials (also collectively referred to as compounded materials) or a molding method using liquid materials (including paste-like materials). Examples of molding methods using compounded materials include compression molding, transfer molding, and injection molding. Examples of molding methods using liquid materials include injection molding, sometimes referred to as liquid injection molding (LIM).

[0087] Figure 1A The mold 50a shown is suitable for direct pressure injection molding. Material is placed on the upper part of the upper mold 51a, and a pressing mold is applied from above, thereby injecting material through the injection hole 55a. Note that in mold 50a, the position or shape of the injection hole can be changed depending on the molding method.

[0088] As the molding material, an elastic material can be appropriately used. When the battery 30, described later, is surrounded by an elastomer, the battery module 10 can have high impact resistance (see [reference]). Figure 1E Furthermore, when a flexible battery is used as battery 30, a battery module 10 that can be wrapped around an arm or the like can be obtained.

[0089] As a rubber material, thermosetting materials can be appropriately used. When thermosetting rubber materials are used, products with high heat resistance and usability over a wide temperature range can be provided. Furthermore, high chemical resistance or high weather resistance can be achieved when using rubber materials.

[0090] As rubber materials, typically silicone rubber or fluororubber can be used. Silicone rubber or fluororubber is relatively easy to mold and is suitable for use in products that come into contact with the human body.

[0091] Other rubber materials that can be used include natural rubber, styrene-butadiene rubber, isoprene rubber, butadiene rubber, chloroprene rubber, acrylonitrile-butadiene rubber, butyl rubber, polyurethane rubber, ethylene-propylene rubber, and ethylene-propylene-diene rubber.

[0092] As a resin material, thermoplastic elastomers that exhibit rubber-like elasticity at room temperature can be appropriately used. Compared to using rubber that requires vulcanization, using thermoplastic elastomers can reduce the number of molding steps. For example, styrene-based elastomers, olefin-based elastomers, ester-based elastomers, amide-based elastomers, PVC (polyvinyl chloride) elastomers, polyurethane elastomers, and fluoropolymers can be used.

[0093] Figure 1B and Figure 2A A cross-sectional view and a perspective view of the first portion 21 formed in the manner described above are shown respectively. The first portion 21 is strip-shaped. A recess 23 is formed in the first portion 21, having an open end 24 on one of its shorter sides. The shape of the recess 23 is designed so that the battery 30, which will be described later, can be fitted into the recess 23.

[0094] Part 1, Section 21: Usage Figure 1A Formed by the mold 50a shown, as Figure 1B and Figure 2A As shown, it has a shape where it is obliquely cut near the opening end 24. This increases the area of ​​the opening end 24, making it easier to insert the battery 30 in subsequent processes. Furthermore, since the area where the second part 22 and the first part 21 of the outer packaging body 20 of the battery module 10, described later, meet is increased, their bonding strength can be improved (see reference). Figure 1E and Figure 2C ).

[0095] Next, the battery 30 is inserted into the recess 23 from the opening end 24 side of the first part 21. Figure 1C , Figure 2B ).

[0096] The battery 30 includes an outer casing 31 and a pair of tabs 32. An example is shown here where a thin-film material is used as the outer casing 31. A positive electrode, a negative electrode, and an electrolyte are sealed within the outer casing 31. The pair of tabs 32 are electrically connected to the positive and negative electrodes and are positioned to protrude outwards from the outer casing 31. The outer casing 31 has a structure where it is folded on the side opposite to where the tabs 32 are located (also called the bottom), and its three sides are joined (sealed). Here, of the three sealed sides of the outer casing 31, the side with the tabs 32 is sometimes referred to as the top seal, and the other two sides are each referred to as the side seals. Note that in... Figure 1C The internal structure of battery 30 is omitted in the following text.

[0097] The battery 30 is configured such that at least a portion of the tab 32 overlaps with the opening end 24 and another portion of the tab 32 protrudes to the outside of the opening end 24. The battery 30 may also be configured such that the end of the outer packaging body 31 on the tab 32 side (top seal) is located at the opening end 24.

[0098] like Figure 1C As shown, when the battery 30 is inserted into the first part 21, there may be a gap between the bottom of the battery 30 and the first part 21. Note that in cases where the battery 30 is positioned so as to pass through the neutral surface of the outer packaging 31, it is not necessary to provide a gap, and the battery 30 may be positioned so that the bottom of the battery 30 is in contact with the first part 21.

[0099] Next, as Figure 1D As shown, the battery 30 and the first part 21 are arranged in the mold 50b used to form the second part 22.

[0100] Mold 50b includes upper mold 52a, lower mold 52b, etc. Figure 1D An example using mold cores 54a and 54b is shown. The upper mold 52a has an injection hole 55b. Additionally, either the upper mold 52a or the lower mold 52b has a vent hole (not shown).

[0101] The injection hole 55b of the mold 50b is only located near the opening end 24 of the first part 21. Therefore, the molding material is only injected into the vicinity of the opening end 24. Thus, during the second molding process, the molding pressure is applied only to the portion of the battery 30 located near the opening end 24 (such as the tabs 32 and the top seal of the outer packaging 31), and not to other parts of the battery 30. This prevents deformation and damage to the outer packaging 31 of the battery 30. The tabs 32 and the top seal of the outer packaging 31 are thin and not hollow structures, and therefore may be slightly deformed due to the applied molding pressure. However, there is no possibility of damage.

[0102] When using Figure 1DWhen the mold 50b shown shapes the material, it can form a second part 22 that contacts the first part 21. Thus, an outer packaging body 20 comprising the first part 21 and the second part 22 can be manufactured.

[0103] Regarding the forming method of the second part 22, the forming method of the first part 21 described above can be referred to. Using the forming method of the first part 21 to form the second part 22 is preferred because it allows the use of common manufacturing equipment.

[0104] Furthermore, the second part 22 is preferably formed using the same material as the first part 21. This is because it improves the adhesion between the first part 21 and the second part 22.

[0105] Note that the first part 21 and the second part 22 can also be formed using different materials and different forming methods. For example, the first part 21 can be formed using a compounded thermosetting rubber material by direct pressure injection molding, thereby improving weather resistance and chemical resistance. Then, the second part 22 can be formed using a liquid thermoplastic elastomer material by injection molding, thereby forming the second part 22 at a lower pressure. In this case, the damage to the battery 30 during the forming of the second part 22 can be reduced more effectively.

[0106] The above are examples illustrating manufacturing methods.

[0107] Figure 1E and Figure 2C Battery module 10 is shown. Battery module 10 includes an outer casing 20 and a battery 30.

[0108] The second part 22 is directly joined to the first part 21. The second part 22 fills the opening end 24 of the first part 21. Thus, a space 25 surrounded by the first part 21 and the second part 22 is formed in the outer packaging body 20. A portion of the battery 30 is located within the space 25.

[0109] A portion of the tab 32 of the battery 30 protrudes from the second part 22 and is exposed to the outside. The tab 32 can be electrically connected to terminals or circuit boards of electronic devices that will be connected to the battery module 10.

[0110] In the battery 30, the other part of the tab 32 and the top sealing portion of the outer packaging 31 are arranged in contact with the second part 22. Thus, the battery 30 is secured to the outer packaging 20 by the second part 22. The other parts of the outer packaging 31 are not bonded to the first part 21. Therefore, for example, when the first part 21 is bent or deformed, since the outer packaging 31 of the battery 30 and the first part 21 can deform independently of each other, they can be bent with relatively little force.

[0111] Here, as an example, an example is shown where the outer casing 20 of the battery module 10 has holes 26a and 26b extending through in the width direction. Hole 26a, located on one side of the tab 32, is used, for example, to connect to the frame (casing) of the electronic device via a spring rod or the like. Hole 26b is used, for example, to mount a buckle or the like.

[0112] The outer packaging 20 is characterized in that the first portion 21, formed earlier, is larger than the second portion 22, formed later. Specifically, the volume or surface area of ​​the second portion 22 is smaller than that of the first portion 21. Alternatively, in a top or side view, at least one of the width, length, and thickness of the second portion 22 is smaller than that of the first portion 21. By making the second portion 22 smaller, the load on the battery 30 during its formation can be reduced.

[0113] The above is an explanation of structure example 1.

[0114] [Example of variation 1]

[0115] Figures 3A to 3D Cross-sectional schematic diagrams of each stage in the manufacturing method example described herein are shown. The method illustrated herein differs from the manufacturing method example described above in that it uses molds 50c and 50d with different shapes.

[0116] In the examples of the manufacturing methods described above, such as Figure 1B and Figure 2A As shown, the first portion 21 has a shape that is obliquely cut off near the open end 24. On the other hand, in Figure 3A In the mold 50c shown, a space (cavity) for introducing molding material is formed within the mold 50c to form a portion other than the portion inserted into the mold core 53.

[0117] First, the first part 21 is formed using mold 50c by the forming method shown in the example of the manufacturing method described above.

[0118] Figure 3B A cross-sectional schematic diagram of the first part 21, formed using mold 50c, is shown. The open end 24 of the first part 21 is located on the side of the first part 21.

[0119] Next, as Figure 3C As shown, the battery 30 is inserted into the recess 23 of the first part 21 from the side of the opening end 24. Figure 3C An example is shown in which the battery 30 is inserted in such a way that the end of the battery 30 on the side opposite to the tab 32 is in contact with the surface of the recess 23 of the first part 21.

[0120] Next, as Figure 3D As shown, the first part 21, into which the battery 30 is inserted, is positioned within the mold 50d.

[0121] The difference between mold 50d and mold 50b described above is the shape of a portion of the upper mold 52a and the lower mold 52b, as well as the position of the injection hole 55b. Mold 50d is machined to introduce molding material on one side of the opening end 24 located at the end of the first part 21.

[0122] Next, the second part 22 is formed using the molding method shown in the example of the manufacturing method described above, with the mold 50d.

[0123] When the second part 22 is formed using the manufacturing method shown herein, the contact area between the battery 30 and the forming material can be reduced during the second forming process. This reduces the pressure on the battery 30 during the second forming process, thereby enabling the battery module 10 to be manufactured with a high yield.

[0124] Figure 3E A battery module 10 manufactured by the above method is shown. Figure 3E The battery module 10 shown has the same Figure 1E and Figure 2C The examples shown have the same external shape, but Figure 3E The battery module 10 shown is Figure 1E and Figure 2C The difference in the example shown is the shape of the second part 22. Figure 3E The battery module 10 shown is Figure 1E and Figure 2C The examples shown can be distinguished based on the shape of the boundaries (parting lines) formed on the surface of the battery module 10. Figure 3E In the example shown, the boundary between the first part 21 and the second part 22 is only located at the end of the side on which the battery module 10 is mounted. Therefore, when the battery module 10 is connected to an electronic device, the user does not easily see the boundary, thereby achieving secondary effects such as improved design.

[0125] The above is an explanation of variation example 1.

[0126] [Variation Example 2]

[0127] Although the above structural example shows a case where the tab 32 of the battery 30 is used as an electrode of the battery module 10, other structures may also be used.

[0128] Figure 4A and Figure 4B An example is shown where the battery 30 includes the circuit board 33. Figure 4A This is a 3D diagram of battery 30. Figure 4B Viewed from the back side Figure 4A A magnified 3D diagram of the battery at 30°C.

[0129] The battery 30 includes a circuit board 33 and a flexible printed circuit (FPC) 34. The circuit board 33 is arranged to overlap with the top seal of the outer packaging 31.

[0130] The circuit board 33 may include, for example, a protection circuit. As a protection circuit, for example, a circuit that stops charging when the battery 30 is overcharged or stops discharging when the battery 30 is over-discharged can be used. Furthermore, the protection circuit preferably has the function of preventing large current flow in the event of a short circuit between the positive and negative terminals. The protection circuit may also have the function of outputting temperature data of the battery cells in the battery 30, and the function of stopping discharging or charging based on the temperature.

[0131] The circuit board 33 may also include a protection circuit for detecting leakage of the battery 30. For example, a circuit may be used in which multiple wires are arranged along the surface of the outer packaging 31, which are separated from each other and electrically insulated from each other, and have the function of detecting an electrical short circuit when electrolyte comes into contact with two of the wires.

[0132] The circuit board 33 can be, for example, a printed circuit board (PCB) or an FPC. IC chips, including protection circuits, can be mounted on the circuit board 33.

[0133] A pair of tabs 32 are folded and engaged with terminals included in circuit board 33. FPC 34 is connected to circuit board 33. FPC 34 is electrically connected to positive terminals, negative terminals, and temperature data output terminals included in circuit board 33. FPC 34 can be connected to connectors included in electronic devices.

[0134] Figure 4C Showing includes Figure 4A A three-dimensional schematic diagram of the battery module 10 of the battery 30 shown. (As shown) Figure 4C As shown, the battery 30 is positioned such that a portion of the FPC 34 protrudes from the second part 22 of the outer packaging 20.

[0135] The above is an explanation of variation example 2.

[0136] [Example 3]

[0137] As described above, when the outer packaging 20 is strip-shaped, the thickness of a portion of the outer packaging 20 on which the battery 30 is disposed is sometimes thinner than that of other portions. If a large external force is locally applied in a direction perpendicular to the surface of the outer packaging 20, the battery 30 may deform or be damaged. Therefore, it is preferable to arrange the protective member protecting the surface of the battery 30 inside the outer packaging 20.

[0138] Figure 5AAn example of a protective member 35 is shown. The protective member 35 has a shape in which plate-shaped portions 35a and 35b, which are opposed to each other, are joined by a joint 35c. The two plate-shaped portions are configured to be generally parallel and spaced apart from each other, thereby providing a gap for the insertion of the battery 30. The plate-shaped portions 35a and 35b are joined to each other by the joint 35c on one side of the short side of each of the plate-shaped portions 35a and 35b.

[0139] Figure 5B The diagram shows the battery 30 inserted into the protective member 35. At this point, the battery 30 and the protective member 35 may or may not need to be secured. When securing the battery 30 to the protective member 35, it is preferable to secure them near the top sealing portion of the battery 30 and near the joint portion 35c of the protective member. In either case, the relative positions of the battery 30 and the protective member 35 are secured by the second part 22 of the outer packaging 20 when installed inside the outer packaging 20 of the battery module 10.

[0140] Materials used for the protective member 35 can include, for example, metal, plastic, wood, etc. In particular, when using a bent battery module 10, the thickness of the plate-shaped portions 35a and 35b is preferably thin enough to be flexible. When using a bent battery module 10, the thickness of the protective member 35 is preferably 0.02 mm or more and 2 mm or less, more preferably 0.05 mm or more and 1 mm or less, and even more preferably 0.1 mm or more and 0.7 mm or less. Typically, a metal plate with a thickness of 0.1 mm is preferably used for the plate-shaped portions 35a and 35b. With this thickness, the user can wear the battery module 10 without discomfort. Note that when the battery module 10 is not used in a bent state, there is no limitation on the thickness, and the thickness of the protective member 35 is preferably thicker to increase strength.

[0141] By using the aforementioned protective member 35, the battery 30 can be protected from localized pressure.

[0142] Figure 6A1 This is a cross-sectional view of the battery module 10 along its length, with the protective component 35 applied. Figure 6A2 This is a cross-sectional view of the battery module 10 in the width direction. Figure 6A1 and Figure 6A2 The plate-shaped portions 35a and 35b of the protective member 35 are shown respectively. Figure 6A1 and Figure 6A2 As shown, the battery 30 is disposed inside the outer packaging 20 with the plate-shaped portion 35a and the plate-shaped portion 35b sandwiched between them.

[0143] Figure 6A3 yes Figure 6A1 An enlarged view of the area surrounded by dashed lines. (See example.) Figure 6A3 As shown, the ends of the plate-shaped portions 35a and 35b preferably protrude in the longitudinal direction so that they are located outside the outer packaging 31 of the battery 30. Figure 6A2 As shown, the widths of the plate-shaped portions 35a and 35b are preferably larger in the width direction than the width of the battery 30 excluding the side sealing portion. In other words, the ends of the plate-shaped portions 35a and 35b in the width direction preferably overlap with the side sealing portion of the battery 30.

[0144] In the case of using a curved battery module 10, it is preferable that the battery 30 and the portions of the plate-shaped parts 35a and 35b, except near the joint 35c, are not fixed. That is, it is preferable that when the battery module 10 is bent, the battery 30, the plate-shaped parts 35a and 35b are staggered and deform independently of each other.

[0145] Figure 6B1 This is a cross-sectional diagram showing the battery module 10 bent with the plate-shaped portion 35b located on the inside. Figure 6B2 yes Figure 6B1 An enlarged view of the area surrounded by dashed lines.

[0146] At this time, the battery 30 is positioned such that the neutral surface of the first portion 21 of the outer packaging 20 is approximately located at the center of the battery 30. Therefore, when the battery module 10 is bent, the relative position of the end of the battery 30 to the first portion 21 hardly changes. On the other hand, the plate-shaped portion 35a located outside the bent portion deforms so that its end moves away from the inner wall of the first portion 21. The plate-shaped portion 35b located inside the bent portion deforms so that its end moves close to the inner wall of the first portion 21.

[0147] Figure 6C1 and Figure 6C2 The diagram shows a case where the plate-shaped portion 35b is bent with the plate-shaped portion 35b located on the outer side. In this case, the end of the plate-shaped portion 35a slides and approaches the inner wall of the first portion 21, while the end of the plate-shaped portion 35b slides and moves away from the inner wall of the first portion 21.

[0148] Therefore, when the battery module 10 is not bent, and there is a gap between the end of the plate-shaped portion 35a and the end of the plate-shaped portion 35b and the first portion 21, the end of the plate-shaped portion 35a or the plate-shaped portion 35b does not contact the first portion 21, and the battery module 10 can be bent with a small force.

[0149] Here, by making the lengths of the plate-shaped portion 35a and the plate-shaped portion 35b different, the function of preventing the battery module 10 from bending excessively can be achieved.

[0150] Figure 7A1 and Figure 7A2An example is shown where, with the battery module 10 extended, the end of the plate-shaped portion 35a contacts the inner wall of the first portion 21 of the outer packaging 20. The end of the plate-shaped portion 35b does not contact the inner wall of the first portion 21, and a gap is provided between them.

[0151] At this time, in such Figure 7A1 When the plate-shaped portion 35a is bent with the plate-shaped portion 35a located on the inside as shown by the arrow, there is no gap for the end of the plate-shaped portion 35a to slide outward, so the plate-shaped portion 35a cannot be bent. As a result, the plate-shaped portion 35a acts as a stopper, thereby preventing the battery module 10 from bending.

[0152] On the other hand, when the plate-shaped portion 35a is bent with the plate-shaped portion 35b on the outside, the battery module 10 can be bent because there is a gap between the end of the plate-shaped portion 35b and the inner wall of the first portion 21.

[0153] Figure 7B1 and Figure 7B2 Each section is shown with the plate-shaped portion 35b located on the inside. In this case, the end of the plate-shaped portion 35a slides away from the inner wall of the first portion 21, and the end of the plate-shaped portion 35b slides close to the inner wall.

[0154] Figure 7C1 and Figure 7C2 Each section is shown when bent with a greater curvature. At this time, when the end of the plate-shaped portion 35b contacts the inner wall of the first portion 21, the plate-shaped portion 35b acts as a stopper for the same reason as above, thereby preventing the battery module 10 from bending further.

[0155] Thus, by changing the shape of the space 25 and the lengths of the plate-shaped portions 35a and 35b, the movable range of the battery module 10 can be limited.

[0156] When the battery module 10 is bent, a repulsive force occurs when the end of the plate-shaped portion 35a (or plate-shaped portion 35b) contacts the inner wall of the first portion 21. This increases the force required to bend the battery module 10 compared to when the plate-shaped portion 35a (or plate-shaped portion 35b) is not in contact with the inner wall of the outer packaging 20. Therefore, the user can be informed of the range of motion of the battery module 10, thereby preventing unintentional excessive bending and damage to the battery module 10.

[0157] Note that when the lengths of the plate-shaped portions 35a and 35b are equal, the permissible radius of curvature of the battery module 10 when bent with the plate-shaped portion 35a on the inside and when bent with the plate-shaped portion 35b on the inside can be approximately equal. On the other hand, when the lengths of the plate-shaped portions 35a and 35b are different, the permissible radius of curvature can be different depending on the bending direction.

[0158] Figure 8A1 , Figure 8A2 and Figure 8A3 An example is shown where slits 21a, 21b, and 21c, which serve as guide rails, are provided inside the outer packaging body 20. By utilizing slits 21a, 21b, and 21c, the shape of the plate-shaped portions 35a and 35b that deform when the outer packaging body 20 is bent can be predetermined.

[0159] The end of the plate-shaped portion 35a is inserted into slit 21a. The end of the plate-shaped portion 35b is inserted into slit 21b. In the example shown here, the plate-shaped portion 35a is longer than the plate-shaped portion 35b in the longitudinal direction, so that the end of the plate-shaped portion 35a contacts the inner wall of slit 21a. Therefore, Figure 8A1 and Figure 8A3 An example is shown where the battery module 10 is designed to be unable to be bent with the plate-like portion 35a located on the inside.

[0160] like Figure 8B1 and Figure 8B2 As shown, when the battery module 10 is bent with the plate-shaped portion 35b located on the inside, the plate-shaped portion 35a can slide along the slit 21a, and the plate-shaped portion 35b can slide along the slit 21b.

[0161] like Figure 8C1 and Figure 8C2 As shown, when the battery module 10 is further bent, the end of the plate-shaped portion 35b comes into contact with the inner wall of the slit 21b, thereby preventing the battery module 10 from bending further.

[0162] Thus, slits 21a and 21b are each used as guides to specify the sliding direction of the plate-shaped portions 35a and 35b. By providing the slits 21a and 21b, even if the battery module 10 is repeatedly bent and stretched, end deformation of the plate-shaped portions 35a and 35b can be suppressed, thereby enabling the battery module 10 to have high reliability.

[0163] Here, the lengths of slits 21a and 21b, as well as the lengths of plate-shaped portions 35a and 35b, can be set according to the movable range of the battery module 10. Here, the lengths of slits 21a and 21b are approximately equal to each other, but their lengths can also be different from each other.

[0164] The battery module 10 has the ability to operate in a non-bending state ( Figure 8A1 The structure is such that the end of the plate-shaped portion 35a contacts the inner wall of the slit 21a. However, the battery module 10 can also be bent so that the plate-shaped portion 35a is located on the inside by providing a gap between the end of the plate-shaped portion 35a and the inner wall of the slit 21a.

[0165] Preferably, such as Figure 8C2 As shown, the lengths of the plate-shaped portion 35a and the slit 21a are set such that when the end of the plate-shaped portion 35a slides to its innermost side (on one side of the second portion 22), the end of the plate-shaped portion 35a is located within the slit 21a. Similarly, it is preferable that, as Figure 8A3 As shown, the lengths of the plate-shaped portion 35b and the slit 21b are set such that when the end of the plate-shaped portion 35b slides to the innermost side (on one side of the second part 22), the end of the plate-shaped portion 35b is located inside the slit 21b.

[0166] Figure 8A2 A schematic diagram of the cross-section in the width direction is shown. Figure 8A2 In the example shown, both plate-shaped portions 35a and 35b are wider in the width direction than the width of the battery 30, including the width of the side sealing portion. A slit 21c is provided in the outer packaging 20, through which the ends of plate-shaped portions 35a and 35b in the width direction are inserted. By adopting the above structure, plate-shaped portions 35a and 35b are less likely to misalign with the outer packaging 20 in the width direction. As a result, the integration between the outer packaging 20 and plate-shaped portions 35a and 35b is improved when the battery module 10 is bent, so that the user can wear the battery module 10 without discomfort.

[0167] The above is an explanation of variation example 3.

[0168] [Structure Example 2]

[0169] The following describes an example of a battery module that includes a frame on which electronic devices can be mounted.

[0170] Figure 9A The battery module 60 is shown with the electronic device 80 installed. The battery module 60 can also be used as a wearable component of the electronic device 80. Therefore, the device combining the electronic device 80 and the battery module 60 can be used, for example, as a watch-type terminal device. The electronic device 80 can be attached to and detached from the battery module 60 on its rear side.

[0171] Figure 9B This shows the battery module 60 after the electronic device 80 has been removed. Figure 9C Electronic device 80 is shown.

[0172] The battery module 60 includes a strap 61, a strap 62, and a holding part 63. A battery 30 is housed inside the strap 61. The holding part 63 holds the electronic device 80. The holding part 63 includes a frame 70. Furthermore, the holding part 63 includes an operation button 64.

[0173] The electronic device 80 includes a frame 81. The frame 81 includes a display unit 82, terminals 83 and terminals 84.

[0174] In the battery module 60, elastomers such as rubber are used as the strap portion 61, strap portion 62, and retaining portion 63. The strap portion 61 and strap portion 62 are directly bonded to the retaining portion 63, so they can be said to be integrally formed. In the retaining portion 63, an elastomer such as rubber is directly formed to cover a part of the frame 70. Therefore, no adhesives are used when bonding the frame 70 to the outer packaging covering it, thus improving their bonding strength.

[0175] Figure 10A The electronic device 80 is shown as viewed from the side of terminals 83 and 84. Figure 10B The frame 70 to which the battery 30 is connected is shown. Figure 10C Showing Figure 10B The border has been rotated 180 degrees.

[0176] The frame 70 has a frame shape that engages with the electronic device 80. Three terminals 71 and 72 are provided on the inner surface of the frame 70.

[0177] The electronic device 80 has three terminals 83 and a terminal 84 in its frame 81. The three terminals 71, located on the inner side of the frame 70, are positioned to contact the terminals 83 when the electronic device 80 is installed. Similarly, the terminal 72 is positioned to contact the terminal 84.

[0178] A housing 75 is mounted on the outer surface of the frame 70. The tabs 32 of the battery 30 are engaged with a pair of terminals included in the housing 75. A circuit board 33 (not shown) as shown in the modified example 2 above is provided in the housing 75. Three terminals 71 provided in the frame 70 are electrically connected to the positive terminal, negative terminal and temperature data output terminal of the circuit board 33 (not shown).

[0179] Terminal 72 is set in Figure 9B The portion of the holding part 63 shown is connected to the operation button 64 and the terminal 84 included in the electronic device 80. The terminal 84 can be either a physical button or an electrode. When the terminal 84 is a physical button, for example, a terminal 72 is formed using a movable member, so that when the operation button 64 is pressed, the terminal 84 can be pressed through the terminal 72. When the terminal 84 is an electrode, for example, the terminal 72 can be an electrical switch, so that when the operation button 64 is pressed, the terminal 72 can have the function of transmitting an electrical signal indicating whether it is on or off to the terminal 84.

[0180] The frame 70 can be made of a material capable of supporting the forming of the outer packaging. For example, any material such as plastic, metal, alloy, glass, or wood can be used. Preferably, the frame 70 is made of a material whose rigidity is at least higher than that of the outer packaging covering the frame 70, the strap 61, and the strap 62.

[0181] This battery module 60 can be used as the main power source or auxiliary power source for the electronic device 80 by mounting it. Because the battery module 60 includes a frame 70 for easy mounting and dismounting of the electronic device 80, the user can freely and appropriately interchange the battery module 60.

[0182] Note that, although not shown, the battery module 60 preferably includes a power receiving terminal or a power receiving mechanism such as an antenna capable of receiving power wirelessly. When the electronic device 80 has a power receiving function, the power received by the electronic device 80 can be transmitted to the battery 30 through the terminal 71 to charge the battery 30.

[0183] Next, refer to Figures 11A to 11C An example illustrating the manufacturing method of battery module 60.

[0184] First, the first part 41a is formed by first forming using the first mold. Figure 11A The first part 41a is the part that will later become the belt part 61. Its forming method can refer to the method described above.

[0185] In addition, a first part 41b is formed separately. The first part 41b is the part that will later become the strip 62. Note that the first part 41b and the first part 41a can also be formed simultaneously using a single mold.

[0186] Note that since the battery 30 is not inserted on the side of the first part 41b, the belt part 62 and the retaining part 63 can also be formed simultaneously by forming the first part 41b during the second forming process described later.

[0187] Here, as Figure 11A As shown, a recess 23 for inserting the battery 30 is formed in the first portion 41a. A portion of the first portion 41a and a portion of the first portion 41b preferably have a shape that engages with the frame 70.

[0188] Next, insert the battery 30, which engages with the frame 70, into the first part 41a. Figure 11B ).

[0189] Next, the first part 41a, the first part 41b, and the frame 70 are placed in the second mold for a second forming process to form the second part 42. Figure 11CThe second part 42 is formed in such a way that it contacts a portion of the first part 41a, a portion of the first part 41b, and a portion of the border 70. The second part 42 is formed in such a way that it fills the space between the first part 41a and the border 70, and between the first part 41b and the border 70. Furthermore, the second part 42 is formed in such a way that it fills the opening of the recess 23 of the first part 41a.

[0190] The battery module 60 can be manufactured using the method described above. Since the battery module 60 is integrally formed with the flexible outer casing, it achieves high impact resistance and high design flexibility.

[0191] The above is an explanation of structural example 2.

[0192] [Structure Example 3]

[0193] When using existing rigid outer packaging such as metal, there are concerns about deformation or damage upon drops or impacts. This risk is particularly high in portable electronic devices. On the other hand, according to one embodiment of the present invention, an outer packaging incorporating an elastomer can be formed to cover the battery, thereby achieving high impact resistance. Therefore, the battery module according to one embodiment of the present invention has a structure that can replace existing battery modules, and electronic devices using the battery module can have significantly higher reliability.

[0194] The following describes a method for manufacturing a battery module suitable for portable electronic devices.

[0195] First, prepare battery 30a. An example of using a wound battery as battery 30a is shown here. Battery 30a includes an outer casing 31 and a pair of tabs 32.

[0196] Next, the outer casing 91 is attached to the tab 32 of the battery 30a. Figure 12A ).

[0197] Figure 12B An exploded view of the housing 91 is shown. The housing 91 includes a top cover 91a, a bottom cover 91b, and a circuit board 33 sandwiched between them. The bottom cover 91b includes terminals that engage with tabs 32 of the battery 30a and terminals that connect to the circuit board 33. The circuit board 33 includes three terminals 92. The top cover 91a has an opening at a position overlapping the terminals 92. Thus, the terminals 92 of the circuit board 33 are exposed.

[0198] Next, by performing the first forming using the first mold, the first part 95 is formed. Figure 12C The forming method can refer to the method described above. A recess 94 for inserting a battery 30a is formed in the first part 95.

[0199] Next, insert the battery 30a into the recess 94 of the first part 95. Figure 12D ).

[0200] Next, the first part 95, battery 30a, and casing 91 are placed in the second mold for a second forming process to form the second part 96. Figure 12E The second part 96 is formed to fill the open end of the first part 95. Furthermore, the second part 96 is formed to fill the space between the first part 95 and the housing 91. Preferably, the second part 96 is formed as a bottom cover 91b covering the housing 91. The second part 96 may also be formed as a part of a top cover 91a covering the housing 91. The top cover 91a serves as part of the outer packaging of the battery module 90.

[0201] The battery module 90 can be manufactured using the method described above. Since the outer casing 97 of the battery module 90 is formed using an elastomer, it achieves extremely high impact resistance compared to existing battery modules. Furthermore, in the battery module 90, the outer shell 91 and the outer casing 97 are integrally formed, thus eliminating gaps between them and preventing the ingress of dust and water, thereby ensuring high reliability of the battery module 90.

[0202] The above is an explanation of structural example 3.

[0203] [Application Examples]

[0204] The outer packaging forming method of one embodiment of the present invention can be applied not only to battery modules with batteries, but also to modules with various built-in electronic components. This results in modules with high impact resistance.

[0205] For example, as an electronic component, an electronic component that includes at least an outer casing and electrodes can be used. Regarding the structure of a module including an electronic component and its manufacturing method, refer to the examples of the structure and manufacturing method of the battery module described above, and such an electronic component can be used instead of the battery described above.

[0206] Various modules can be manufactured using any of the above-described molding methods for the outer casing. In each of these modules, electronic components with low pressure resistance or low high temperature resistance are covered by an outer casing such as rubber, and the terminals are exposed. Examples of electronic components include, for instance, IC chips with various functions such as CPUs, FPGAs, and memory, or IC chips with various sensors.

[0207] Examples of sensors include accelerometers, angular velocity sensors, vibration sensors, pressure sensors, gyroscopes, and photoelectric sensors. Additionally, sensors that acquire biological information (e.g., body temperature, blood pressure, pulse rate, sweat volume, lung capacity, blood glucose level, blood ethanol concentration, SpO2 (oxygen saturation), fingerprints, veins, iris scans, or voiceprints) can be used. Furthermore, any type of sensor that measures the following factors can be used: force, displacement, position, velocity, acceleration, angular velocity, rotational speed, distance, light, liquid, magnetism, temperature, chemical substances, sound, time, hardness, electric field, current, voltage, electrical force, radiation, flow rate, humidity, slope, vibration, odor, and infrared radiation.

[0208] When used as an outer packaging material, translucent materials can be applied to display devices such as liquid crystal panels or organic EL panels. For example, translucent rubber can be used to cover flexible display panels.

[0209] That is, one embodiment of the present invention is a module including a first outer packaging body and an electronic component. The electronic component includes a second outer packaging body and an electrode. The electrode is disposed such that it protrudes from the surface of the second outer packaging body. The first outer packaging body comprises an elastic material. The first outer packaging body includes a first portion, a second portion, and a space surrounded by the first portion and the second portion. The electronic component is disposed in the space, and the first portion and the second portion are joined together. The second portion contacts the electrode and the end of the second outer packaging body.

[0210] In the above structure, the first outer packaging body preferably includes a protective member. The protective member preferably has a third portion covering one of two opposing surfaces of the second outer packaging body and a fourth portion covering the other. The third and fourth portions are preferably plate-shaped and deformable with the first outer packaging body.

[0211] Another embodiment of the present invention is a method for manufacturing a module including an electronic component and a first outer packaging body covering the electronic component, comprising the following steps: In a first step, an electronic component including a second outer packaging body and electrodes is prepared. In a second step, a first material is shaped using a first mold to form a first portion having a recess. In a third step, the electronic component is inserted into the recess from one side of the opening end, such that a portion of the electrodes protrudes to the outside of the opening end of the recess. In a fourth step, the first portion with the inserted electronic component is disposed in a second mold, and a second material is shaped using the second mold to form a second portion sealing the opening end of the recess, thereby forming a first outer packaging body where the first portion and the second portion are joined together. The second portion is formed to contact an end of the second outer packaging body, and a portion of the electrodes is exposed to the outside of the second portion.

[0212] At least a portion of this embodiment can be implemented in combination with any other embodiments and examples described in this specification.

[0213] (Implementation Method 2)

[0214] Hereinafter, examples of the structure and manufacturing method of a secondary battery that can be used in one embodiment of the present invention will be described with reference to the accompanying drawings. In particular, an example of a flexible secondary battery will be described below.

[0215] [Structure Example]

[0216] Figure 13 This is a perspective view showing the appearance of the secondary battery 102. Figure 14A It is along Figure 13 The cross-sectional view of the dashed-dot lines A1-A2 in the diagram. Figure 14B It is along Figure 13 The cross-sectional view of the dashed-dot line B1-B2 in the diagram.

[0217] In one embodiment of the present invention, a secondary battery 102 includes a positive electrode 511, a negative electrode 515, and an electrolyte 504, all covered by an insulating body 503 within an outer packaging 507. Figure 13 as well as Figure 14A and Figure 14B In the example shown, the secondary battery includes: a positive electrode with a positive active material layer 502 on one side of the positive current collector 501; a positive electrode with positive active material layers 502 on both sides of the positive current collector 501; a negative electrode with a negative active material layer 506 on one side of the negative current collector 505; and a negative electrode with a negative active material layer 506 on both sides of the negative current collector 505. The positive electrode 511 is electrically connected to a positive electrode wire 521. The negative electrode 515 is electrically connected to a negative electrode wire 525. Each of the positive electrode wire 521 and the negative electrode wire 525 is also referred to as a wire electrode or wire terminal. A portion of the positive electrode wire 521 and the negative electrode wire 525 is disposed on the outside of the outer casing. Charging and discharging of the secondary battery 102 are performed through the positive electrode wire 521 and the negative electrode wire 525.

[0218] Notice, Figure 14A and Figure 14B An example is shown where the positive electrode 511 is covered by the insulator 503, but one embodiment of the invention is not limited thereto. For example, the positive electrode 511 does not necessarily need to be covered by the insulator 503. For example, the negative electrode 515 can also be covered by the insulator 503 instead of the positive electrode 511.

[0219] (positive electrode)

[0220] The positive electrode 511 includes a positive electrode current collector 501 and a positive electrode active material layer 502 formed on the positive electrode current collector 501. Although Figure 14A and Figure 14BExamples are shown including a positive electrode 511 having a positive electrode active material layer 502 on only one side of a sheet-like (or strip-like) positive electrode current collector 501, and a positive electrode 511 having positive electrode active material layers 502 on both sides of the positive electrode current collector 501. However, one embodiment of the present invention is not limited to this. Only positive electrodes 511 having a positive electrode active material layer 502 on each side of the positive electrode current collector 501 can be used. Only positive electrodes 511 having a positive electrode active material layer 502 on each side of the positive electrode current collector 501 can be used. By using positive electrodes 511 having positive electrode active material layers 502 on both sides of the positive electrode current collector 501, the capacity of the secondary battery 102 can be increased. Furthermore, the secondary battery 102 may also include three or more positive electrodes 511. By increasing the number of positive electrodes 511 included in the secondary battery 102, the capacity of the secondary battery 102 can be increased.

[0221] The positive electrode current collector 501 can be made of metals such as stainless steel, gold, platinum, aluminum, and titanium, or their alloys, which have high conductivity and do not dissolve due to the potential of the positive electrode. Alternatively, aluminum alloys with added elements to improve heat resistance, such as silicon, titanium, neodymium, scandium, and molybdenum, can be used. Furthermore, metallic elements that react with silicon to form silicides can also be used. Examples of metallic elements that react with silicon to form silicides include zirconium, titanium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, cobalt, and nickel. The positive electrode current collector 501 can appropriately be in the form of foil, plate (sheet), mesh, perforated metal mesh, or drawn metal mesh. The thickness of the positive electrode current collector 501 is preferably 5 μm or more and 30 μm or less. A substrate layer such as graphite can be provided on the surface of the positive electrode current collector 501.

[0222] In addition to the positive electrode active material, the positive electrode active material layer 502 may also include an adhesive for improving the compactness of the positive electrode active material and a conductive additive for improving the conductivity of the positive electrode active material layer 502.

[0223] Examples of positive electrode active materials that can be used in the positive electrode active material layer 502 include composite oxides with olivine-type crystal structures, composite oxides with layered rock salt-type crystal structures, and composite oxides with spinel-type crystal structures. Examples of positive electrode active materials include compounds such as LiFeO2, LiCoO2, LiNiO2, LiMn2O4, V2O5, Cr2O5, and MnO2.

[0224] In particular, LiCoO2 has advantages such as large capacity, atmospheric stability and thermal stability compared to LiNiO2, making it the preferred choice.

[0225] Preferably, a small amount of lithium nickel oxide (LiNiO2 or LiNi) is mixed into lithium-containing materials containing manganese and having a spinel-type crystal structure, such as LiMn2O4. 1-x Mx O2 (0 < x < 1) (M = Co, Al, etc.) can improve the characteristics of secondary batteries using the above materials.

[0226] Alternatively, composite materials (LiMPO4 (general formula) (M is one or more of Fe(II), Mn(II), Co(II), Ni(II)) can be used). Typical examples of general formula LiMPO4 that can be used as materials are lithium compounds, such as LiFePO4, LiNiPO4, LiCoPO4, LiMnPO4, LiFe a Ni b PO4, LiFe a Co b PO4, LiFe a Mn b PO4, LiNi a Co b PO4, LiNi a Mn b PO4(a+b≤1, 0<a<1, 0<b<1), LiFe c Ni d Co e PO4, LiFe c Ni d Mn e PO4, LiNi c Co d Mn e PO4(c+d+e≤1, 0<c<1, 0<d<1, 0<e<1), LiFe f Ni g Co h Mn i PO4 (f+g+h+i≤1, 0<f<1, 0<g<1, 0<h<1, 0<i<1), etc.

[0227] In particular, LiFePO4 is preferred because it uniformly satisfies the requirements for positive electrode active materials, such as safety, stability, high capacity density, and the presence of lithium ions that can be extracted during initial oxidation (charging).

[0228] Alternatively, Li can be used. (2－j) MSiO4 (general formula) (M is one or more of Fe(II), Mn(II), Co(II), Ni(II), 0≤j≤2) and other composite materials. Li, a general formula that can be used as a material... (2－j) Typical examples of MSiO4 are lithium compounds, such as Li (2－j) FeSiO4, Li (2－j) NiSiO4, Li (2－j) CoSiO4, Li(2－j) MnSiO4, Li (2－j) Fe k Ni l SiO4, Li (2－j) Fe k Co l SiO4, Li (2－j) Fe k Mn l SiO4, Li (2－j) Ni k Co l SiO4, Li (2－j) Ni k Mn l SiO4 (k+l≤1, 0<k<1, 0<l<1), Li (2－j) Fe m Ni n Co q SiO4, Li (2－j) Fe m Ni n Mn q SiO4, Li (2－j) Ni m Co n Mn q SiO4 (m+n+q≤1, 0<m<1, 0<n<1, 0<q<1), Li (2－j) Fe r Ni s Co t Mn u SiO4 (r+s+t+u≤1, 0<r<1, 0<s<1, 0<t<1, 0<u<1), etc.

[0229] In addition, as a positive electrode active material, A can be used x Sodium superionic conductor compounds represented by the general formula M2(XO4)3 (A = Li, Na, Mg, M = Fe, Mn, Ti, V, Nb, X = S, P, Mo, W, As, Si). Examples of sodium superionic conductor compounds include Fe2(MnO4)3, Fe2(SO4)3, and Li3Fe2(PO4)3. Furthermore, as positive electrode active materials, compounds represented by the general formulas Li2MPO4F, Li2MP2O7, and Li5MO4 (M = Fe, Mn) can be used; perovskite fluorides such as NaFeF3 and FeF3; metal chalcogenides (sulfides, selenides, tellurides) such as TiS2 and MoS2; oxides with an anti-spinel crystal structure such as LiMVO4; and vanadium oxides (V2O5, V6O4). 13 (e.g., LiV3O8); manganese oxides; or organic sulfur compounds, etc.

[0230] When the carrier ion is an alkali metal ion other than lithium ion or an alkaline earth metal ion, a substance containing an alkali metal (e.g., sodium, potassium, etc.) or an alkaline earth metal (e.g., calcium, strontium, barium, beryllium, or magnesium, etc.) can be used instead of lithium as the positive electrode active material. For example, the positive electrode active material can be NaFeO2, Na... 2 / 3 [Fe 1 / 2 Mn 1 / 2 Sodium-containing layered oxides such as O2.

[0231] Alternatively, any of the above materials can be used in combination as the positive electrode active material. For example, a solid solution obtained by combining multiple of the above materials can also be used as the positive electrode active material. For example, LiCO can also be used. 1 / 3 Mn 1 / 3Ni 1 / 3 Solid solutions of O2 and Li2MnO3 are used as positive electrode active materials.

[0232] Note that, although not shown, a conductive material such as a carbon layer can also be provided on the surface of the positive electrode active material layer 502. Providing a conductive material such as a carbon layer can improve the conductivity of the electrode. For example, by mixing carbohydrates such as glucose during the calcination of the positive electrode active material, the positive electrode active material layer 502 can be covered by a carbon layer.

[0233] The average particle size of the primary particles in the positive electrode active material layer 502 is preferably 50 nm or more and 100 μm or less.

[0234] Examples of conductive additives include acetylene black (AB), graphite (lead black) particles, carbon nanotubes, graphene, fullerene, etc.

[0235] By utilizing conductive additives, an electronically conductive network can be formed in the positive electrode 511. Conductive additives also maintain the conductive paths between particles in the positive electrode active material layer 502. Adding conductive additives to the positive electrode active material layer 502 increases its electronic conductivity.

[0236] In addition to the typical polyvinylidene fluoride (PVDF), other adhesives that can be used include polyimide, polytetrafluoroethylene, polyvinyl chloride, ethylene propylene diene monomer (EPDM), styrene-butadiene rubber, acrylonitrile-butadiene rubber, fluororubber, polyvinyl acetate, polymethyl methacrylate, polyethylene, and nitrocellulose.

[0237] The preferred range of binder content in the positive electrode active material layer 502 can be appropriately set according to the particle size of the active material, and is preferably 1 wt% or more and 10 wt% or less. For example, the preferred range can be 2 wt% or more and 8 wt% or less, or 3 wt% or more and 5 wt% or less, etc. The content of conductive additive in the positive electrode active material layer 502 is preferably 1 wt% or more and 10 wt% or less, more preferably 1 wt% or more and 5 wt% or less.

[0238] When the positive electrode active material layer 502 is formed by coating, the positive electrode active material, binder and conductive additive can be mixed to form a positive electrode slurry, and the positive electrode slurry can be coated on the positive electrode current collector 501 and dried.

[0239] (negative electrode)

[0240] The negative electrode 515 includes a negative electrode current collector 505 and a negative electrode active material layer 506 formed on the negative electrode current collector 505. Although Figure 14A and Figure 14B Examples are shown including a negative electrode 515 having a negative electrode active material layer 506 on only one side of a sheet-like (or strip-like) negative electrode current collector 505, and a negative electrode 515 having a negative electrode active material layer 506 on both sides of the negative electrode current collector 505; however, one embodiment of the invention is not limited to this. Only negative electrodes 515 having a negative electrode active material layer 506 on each side of the negative electrode current collector 505 can be used. In this case, the surfaces of the negative electrode current collector 505 without the negative electrode active material layer 506 are preferably located in contact with each other, because this configuration reduces friction at the contact surfaces, thereby easily releasing stress generated when the secondary battery 102 is bent. Only negative electrodes 515 having a negative electrode active material layer 506 on each side of the negative electrode current collector 505 can be used. By using negative electrodes 515 having a negative electrode active material layer 506 on both sides of the negative electrode current collector 505, the capacity of the secondary battery 102 can be increased. Furthermore, the secondary battery 102 may also include three or more negative electrodes 515. By increasing the number of negative electrodes 515 included in the secondary battery 102, the capacity of the secondary battery 102 can be increased.

[0241] The negative electrode current collector 505 can be formed from materials with high conductivity that do not alloy with carrier ions such as lithium ions, such as stainless steel, gold, platinum, iron, copper, titanium, or their alloys. Alternatively, aluminum alloys with added elements to improve heat resistance, such as silicon, titanium, neodymium, scandium, and molybdenum, can be used. The negative electrode current collector 505 can appropriately be in the form of foil, plate (sheet), mesh, perforated metal mesh, drawn metal mesh, etc. The thickness of the negative electrode current collector 505 is preferably 5 μm or more and 30 μm or less. A substrate layer such as graphite can be provided on the surface of the negative electrode current collector 505.

[0242] In addition to the negative electrode active material, the negative electrode active material layer 506 may also include an adhesive to improve the compactness of the negative electrode active material and a conductive additive to improve the conductivity of the negative electrode active material layer 506.

[0243] There are no particular restrictions on the negative electrode active material as long as it can dissolve and precipitate lithium or allow lithium ions to insert and deintercalate. In addition to lithium metal or lithium titanate, other materials that are commonly used in the field of energy storage, such as carbon materials and alloy materials, can also be used as the negative electrode active material layer 506.

[0244] Lithium metal has a low redox potential (3.045V lower than the standard hydrogen electrode) and a high specific capacity per weight and per volume (3860mAh / g and 2062mAh / cm³, respectively). 3 Therefore, it is the preferred option.

[0245] Examples of carbon-based materials include graphite, easily graphitized carbon (soft carbon), difficult-to-graphitize carbon (hard carbon), carbon nanotubes, graphene, carbon black, etc.

[0246] Examples of graphite include mesophase carbon microspheres (MCMB), coke-based artificial graphite, pitch-based artificial graphite, and other artificial graphite, or spheroidized natural graphite and other natural graphite.

[0247] When lithium ions are intercalated in the interlayer (during the formation of lithium-graphite intercalation compounds), graphite exhibits a similarly low potential to lithium metal (0.1V to 0.3V vs. Li / Li). + Therefore, lithium-ion batteries can have high operating voltages. Furthermore, graphite has the following advantages: high capacitance per unit volume; small volume expansion; lower cost; and higher safety compared to lithium metal, making it a preferred choice.

[0248] As the negative electrode active material, alloy materials or oxides capable of charge-discharge reactions through alloying and dealloying reactions with lithium can also be used. When the carrier ion is lithium ion, the alloy material is, for example, a material containing at least one of Mg, Ca, Al, Si, Ge, Sn, Pb, Sb, Bi, Ag, Au, Zn, Cd, Hg, and In. This element has a higher capacitance than carbon. In particular, silicon has a significantly higher theoretical capacitance, at 4200 mAh / g. Therefore, silicon is preferred as the negative electrode active material. Examples of alloy materials using this element include Mg₂Si, Mg₂Ge, Mg₂Sn, SnS₂, V₂Sn₃, FeSn₂, CoSn₂, Ni₃Sn₂, Cu₆Sn₅, Ag₃Sn, Ag₃Sb, Ni₂MnSb, CeSb₃, LaSn₃, La₃Co₂Sn₇, CoSb₃, InSb, SbSn, etc.

[0249] In addition, oxides such as SiO, SnO, SnO2, titanium dioxide (TiO2), and lithium titanium oxide (Li4Ti5O) can be used as negative electrode active materials. 12 ), lithium-graphite intercalation compounds (Li x C6), niobium oxide (Nb2O5), tungsten oxide (WO2), molybdenum oxide (MoO2), etc.

[0250] Furthermore, Li3N-type structures containing lithium and transition metal nitrides can be used as negative electrode active materials. 3-x M x N (M = Co, Ni, Cu). For example, Li 2.6 Co 0.4 N exhibits large charge / discharge capacity (900mAh / g and 1890mAh / cm³). 3 Therefore, it is the preferred option.

[0251] When lithium- and transition metal-containing nitrides are used, lithium ions are included in the negative electrode active material. Therefore, this negative electrode active material can be combined with lithium-ion-free materials such as V₂O₅ and Cr₃O₈ used as positive electrode active materials, which is preferred. Note that when lithium-ion-containing materials are used as positive electrode active materials, lithium- and transition metal-containing nitrides can also be used as negative electrode active materials by pre-deintercalating and deintercalating the lithium ions contained in the positive electrode active material.

[0252] In addition, materials that induce the conversion reaction can also be used as negative electrode active materials. For example, transition metal oxides that do not alloy with lithium, such as cobalt oxide (CoO), nickel oxide (NiO), and iron oxide (FeO), can be used as negative electrode active materials. Other examples of materials that induce the conversion reaction include oxides such as Fe2O3, CuO, Cu2O, RuO2, and Cr2O3, and CoS. 0.89 Sulfides such as NiS and CuS, nitrides such as Zn3N2, Cu3N, and Ge3N4, phosphides such as NiP2, FeP2, and CoP3, and fluorides such as FeF3 and BiF3. Note that any of the above fluorides can also be used as positive electrode active materials due to their high potential.

[0253] In the case where the negative electrode active material layer 506 is formed by coating, the negative electrode active material and binder are mixed to form a negative electrode slurry, and the negative electrode slurry is coated onto the negative electrode current collector 505 and dried. Note that conductive additives may also be added to the negative electrode slurry.

[0254] Graphene can be formed on the surface of the negative electrode active material layer 506. When silicon is used as the negative electrode active material, its volume changes significantly during charge-discharge cycles due to the adsorption and release of carrier ions. This reduces the adhesion between the negative electrode current collector 505 and the negative electrode active material layer 506, resulting in deterioration of battery characteristics during charge-discharge cycles. Therefore, it is preferable to form graphene on the surface of the silicon-containing negative electrode active material layer 506, because even if the volume of silicon changes during charge-discharge cycles, the reduction in adhesion between the negative electrode current collector 505 and the negative electrode active material layer 506 can be suppressed, thereby reducing the deterioration of battery characteristics.

[0255] Alternatively, a coating of oxides or the like can be formed on the surface of the negative electrode active material layer 506. During charging, this coating, formed due to electrolyte decomposition, cannot release the charge consumed during its formation, resulting in irreversible capacity. To address this, by pre-applying a coating of oxides or the like to the surface of the negative electrode active material layer 506, the generation of irreversible capacity can be reduced or prevented.

[0256] As the coating covering the aforementioned negative electrode active material layer 506, an oxide film of any one of niobium, titanium, vanadium, tantalum, tungsten, zirconium, molybdenum, hafnium, chromium, aluminum, and silicon, or an oxide film containing any one of these elements and lithium, can be used. Compared to existing coatings formed on the negative electrode surface due to electrolyte decomposition products, this coating is a denser film.

[0257] For example, niobium oxide (Nb₂O₅) has a low conductivity, i.e., 10⁻⁶. -9 The niobium oxide film has a lithium diffusion coefficient of 10 S / cm, which indicates high insulation. Therefore, the niobium oxide film hinders the electrochemical decomposition reaction between the negative electrode active material and the electrolyte. On the other hand, the lithium diffusion coefficient of niobium oxide is 10. - 9 cm 2 Niobium oxide has a conductivity of 0.05 sec, which is high for lithium-ion conductivity. Therefore, niobium oxide allows lithium ions to pass through. Alternatively, silicon oxide or aluminum oxide can also be used.

[0258] To coat the negative electrode active material layer 506 with a coating, a sol-gel method can be used, for example. The sol-gel method is a method for forming a thin film in which a solution containing metal alkoxides or metal salts is transformed into a gel that loses its fluidity through water splitting and condensation reactions, followed by calcination of the gel. Since the thin film is formed from the liquid phase in the sol-gel method, the raw materials can be uniformly mixed at the molecular level. Therefore, by adding a negative electrode active material such as graphite to the raw material of the metal oxide film as a solvent, the active material can be easily dispersed in the gel. In this way, a coating can be formed on the surface of the negative electrode active material layer 506. Using this coating, the capacity reduction of the energy storage device can be prevented.

[0259] (isolation body)

[0260] The material used for separator 503 can be porous insulators such as cellulose, polypropylene (PP), polyethylene (PE), polybutene, nylon, polyester, polysulfone, polyacrylonitrile, polyvinylidene fluoride, tetrafluoroethylene, and polyphenylene sulfide. Alternatively, nonwoven fabrics such as glass fiber or membranes composed of glass fiber and polymer fibers can also be used.

[0261] (electrolyte)

[0262] The electrolyte used in electrolyte 504 is a material that has carrier ion mobility and contains lithium ions as carrier ions. Typical examples of electrolytes are lithium salts such as LiPF6, LiClO4, LiAsF6, LiBF4, LiCF3SO3, Li(CF3SO2)2N, Li(C2F5SO2)2N, and Li(SO2F)2N. One of these electrolytes can be used alone, or in any combination and ratio of two or more of these electrolytes.

[0263] In particular, when high-temperature processing is performed in the molding of rubber and the like, the electrolyte preferably has high heat resistance. For example, an imine salt with a high thermal decomposition temperature is preferred.

[0264] As the solvent for electrolyte 504, a material with carrier ion mobility is used. Aprotic organic solvents are preferred as the electrolyte solvent. Typical examples of aprotic organic solvents include ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate, diethyl carbonate (DEC), methyl ethyl carbonate (EMC), γ-butyrolactone, acetonitrile, ethylene glycol dimethyl ether, tetrahydrofuran, etc., and one or more of these materials can be used. When a gelled polymer material is used as the electrolyte solvent, or when a gelling polymer material is added to the electrolyte, safety, such as leakage resistance, is improved. Furthermore, it enables the secondary battery to be thinner and lighter. Typical examples of gelled polymer materials include silicone gels, acrylic gels, acrylonitrile gels, polyethylene oxide gels, polypropylene oxide gels, fluoropolymer gels, etc. Furthermore, by using one or more flame-retardant and non-volatile ionic liquids (room-temperature molten salts) as the solvent for the electrolyte, even if the internal temperature rises due to internal short circuits, overcharging, etc., the secondary battery can be prevented from rupture or ignition. Ionic liquids are salts in a fluidized state with high ion mobility (conductivity). Ionic liquids contain both cations and anions. Examples of ionic liquids include those containing ethylmethylimidazolium (EMI) cations and those containing N-methyl-N-propylpiperidine (PP) cations. 13 Ionic liquids containing cations, etc.

[0265] In particular, when high-temperature processing is performed in the molding of rubber and the like, a high-boiling-point material is preferably used as the solvent for the electrolyte. For example, propylene carbonate (PC) is preferred.

[0266] (Outer packaging)

[0267] There are various structures for secondary batteries. In this embodiment, a thin film is used to form the outer packaging 507. Note that the film used for the outer packaging 507 is selected from metal films (aluminum, stainless steel, nickel steel, etc.), plastic films formed from organic materials, mixed material films containing organic materials (organic resins or fibers, etc.) and inorganic materials (ceramics, etc.), single-layer films containing carbon inorganic films (carbon films, graphite films, etc.), or laminated films including two or more of the above films. By using embossing to form concave or convex portions on the surface of the metal film, the surface area of ​​the outer packaging 507 exposed to the outside air is increased, thereby achieving a sufficient heat dissipation effect.

[0268] When the shape of the secondary battery 102 changes due to an externally applied force, bending stress is applied from the outside to the outer casing 507 of the secondary battery 102. This may cause deformation or damage to a portion of the outer casing 507. By forming concave or convex portions in the outer casing 507, the strain caused by the stress applied to the outer casing 507 can be mitigated. Therefore, the reliability of the secondary battery 102 can be improved. Note that "strain" is a measure of deformation, which represents the displacement of a point of matter relative to the reference (initial state) length of the object. By having concave or convex portions in the outer casing 507, the effects of strain caused by externally applied forces on the secondary battery can be suppressed within an acceptable range. Therefore, a highly reliable secondary battery can be provided.

[0269] The above is an explanation of the structural examples.

[0270] [Examples of manufacturing methods]

[0271] The following describes an example of the manufacturing method of the aforementioned secondary battery 102.

[0272] (Prepare the positive electrode, which is then covered by an insulator)

[0273] First, a positive electrode 511, including a positive electrode active material layer 502, is disposed on the separator 503 (see reference). Figure 15A ).exist Figure 15A The image shows an example of a positive electrode current collector 501 with a tortuous shape due to the formation of slits, on both sides of which are positive electrode active material layers 502.

[0274] By forming a slit in the positive electrode current collector 501, the misalignment of the ends of multiple current collectors can be prevented when the secondary battery 102 is bent. The slit can also alleviate the tension on current collectors far from the center of curvature.

[0275] Furthermore, when the positive electrode 511 and negative electrode 515 overlap in a subsequent process, the positive electrode active material layer 502 is not provided in the region 511a that overlaps with the slit of the negative electrode 515. If the positive electrode active material layer 502 is provided in the region 511a that overlaps with the slit of the positive electrode 511 and negative electrode 515, it results in a state where there is no negative electrode active material layer 506 in the region overlapping with the positive electrode active material layer 502, which may cause problems during the battery reaction. Specifically, carrier ions released from the positive electrode active material layer 502 may concentrate in the negative electrode active material layer 506 in the region closest to the slit, and thus these carrier ions may deposit on the negative electrode active material layer 506. Therefore, when the positive electrode active material layer 502 is not provided in the region 511a that overlaps with the slit of the negative electrode 515, the deposition of carrier ions on the negative electrode active material layer 506 can be suppressed.

[0276] Next, by moving the isolation body 503 along Figure 15A The dotted lines are folded, and the positive electrode 511 is clamped by the opposite portions of the separator 503. Next, the outer portions of the separator 503 on the outside of the positive electrode 511 are joined to form a bag-shaped separator 503 (see reference). Figure 15B The outer portion of the isolator 503 can be joined using adhesives or by ultrasonic welding or heated welding.

[0277] In this embodiment, polypropylene is used as the separator 503, and the outer portions of the separator 503 are joined together by heating. Figure 15B The junction 503a is shown. Thus, the positive electrode 511 can be covered by the separator 503. The separator 503 is formed in such a way that it covers the positive electrode active material layer 502, and does not necessarily need to cover the entire positive electrode 511.

[0278] Note that, although in Figure 15A and Figure 15B The example shown is where the separator 503 is folded, but one embodiment of the invention is not limited to this. For example, the positive electrode 511 can also be sandwiched between two separators. In this case, the joint 503a can also be formed in a manner that substantially surrounds all four sides of the positive electrode 511.

[0279] The outer portion of the isolator 503 can be joined either discontinuously or by setting point-like joints at fixed intervals.

[0280] Alternatively, the joint can be made along only one side of the outer portion. Or, it can be made along only two sides of the outer portion. Or, it can be made along all four sides of the outer portion, thereby achieving a state where all four sides are equal.

[0281] Note that, although in Figure 15A and Figure 15B The description of the positive electrode 511 being covered by the separator 503 is provided, but one embodiment of the present invention is not limited thereto. For example, the positive electrode 511 does not necessarily need to be covered by the separator 503. For example, the negative electrode 515 can also be covered by the separator 503 instead of the positive electrode 511.

[0282] (Prepare the negative electrode)

[0283] Next, prepare the negative electrode 515 (refer to...). Figure 15C ).exist Figure 15C The image shows an example of a negative electrode current collector 505 with a tortuous shape due to the formation of slits, on both sides having a negative electrode active material layer 506.

[0284] By forming a slit in the negative electrode current collector 505, the misalignment of the ends of multiple current collectors can be prevented when the secondary battery 102 is bent. The slit can also alleviate the tension on current collectors far from the center of curvature.

[0285] (Stack the positive and negative terminals on top of each other and connect them with wires)

[0286] Next, the positive electrode 511 and the negative electrode 515 are stacked (refer to...). Figure 16A In this embodiment, an example using two positive electrodes 511 and two negative electrodes 515 is shown.

[0287] Next, by applying pressure while irradiating with ultrasonic waves (ultrasonic welding), the positive electrode wire 521 with the sealing layer 520 is electrically connected to the positive electrode tabs of the plurality of positive current collectors 501. Alternatively, laser welding can also be used.

[0288] The wires are prone to cracking or breaking due to stress generated by external forces applied after the manufacture of the secondary battery 102.

[0289] When ultrasonic welding is performed on the positive electrode wire 521, a connection area and a bend can also be formed on the positive electrode tab. Figure 16B ).

[0290] By incorporating this bend, the stress generated by external forces applied after the manufacture of the secondary battery 102 can be mitigated. Therefore, the reliability of the secondary battery 102 can be improved.

[0291] The bend does not necessarily need to be formed in the positive electrode tab. In order to easily mitigate the stress generated by external forces after the secondary battery is manufactured, the positive electrode current collector can also be formed using a high-strength material such as stainless steel and its thickness can be set to less than 10 μm.

[0292] Of course, multiple examples can be combined to mitigate stress concentration on the positive electrode tab.

[0293] Furthermore, similar to the positive current collector 501, the negative electrode wire 525 with a sealing layer 520 is electrically connected to the negative electrode tab of the negative current collector 505 by ultrasonic welding.

[0294] (Prepare outer packaging to cover both the positive and negative electrodes)

[0295] The film used as the outer packaging is bent, and one side of the bent outer packaging is heat-pressed together. Figure 16B In the diagram, the portion where heat pressing is performed along one side of the bent outer packaging body 507 is indicated by the joint 507a. This results in the outer packaging body 507, which covers the positive electrode 511 and the negative electrode 515.

[0296] (Injecting electrolyte)

[0297] Next, in the same manner as described above, heat pressing is performed along one side of the outer packaging 507 that overlaps with the sealing layer 520 provided on the positive electrode wire 521 and the sealing layer 520 provided on the negative electrode wire 525. Figure 17A Then, from Figure 17A Electrolyte 504 is injected into the area covered by the outer packaging 507 through the unsealed side 507b of the outer packaging 507.

[0298] Then, while evacuating, heating, and pressurizing, the remaining side (side 507b) of the outer packaging 507 is sealed, thereby forming the secondary battery 102. Figure 17B The injection and sealing of the electrolyte are carried out in an environment free of impurities such as oxygen, moisture, and nitrogen, such as a glove box. Preferably, evacuation is performed using a vacuum sealer, a liquid injection sealer, or the like. Heating and pressurization are achieved by clamping the unsealed edge 507b with two heat-generating rods provided by the sealer. For example, the conditions are as follows: vacuum degree 40 kPa, heating temperature 190°C, pressure 0.1 MPa, and time 3 seconds. At this time, the edge 507b can also be sealed while pressurizing the portion of the outer packaging 507 where the positive and negative electrodes are located. Pressurization eliminates air bubbles that may have been introduced between the positive and negative electrodes during electrolyte injection.

[0299] (Example of variation)

[0300] Figure 18A A modified example of the secondary battery 102 is shown. Figure 18A The secondary battery 102 shown is Figure 16A and Figure 16B The difference in the secondary battery 102 shown lies in the arrangement of the positive electrode wire 521 and the negative electrode wire 525. Specifically, in Figure 16A and Figure 16B In the secondary battery 102 shown, the positive electrode wire 521 and the negative electrode wire 525 are arranged on the same side of the outer packaging 507, while... Figure 18A and Figure 18B In the secondary battery 102 shown, the positive electrode wire 521 and the negative electrode wire 525 are arranged on different sides of the outer packaging 507. This allows for free arrangement of the wires in the secondary battery according to one embodiment of the present invention, resulting in a high degree of design freedom. Therefore, products incorporating the secondary battery according to one embodiment of the present invention can have a high degree of design freedom. Furthermore, the productivity of products incorporating the secondary battery according to one embodiment of the present invention can be improved.

[0301] Figure 18B This is an explanation Figure 18A The diagram shows the manufacturing process of the secondary battery 102. For details, please refer to... Figure 13 The manufacturing method of the secondary battery 102. Note that in Figure 18B Electrolyte 504 is omitted in the text.

[0302] To pre-form the surface of the film used as the outer packaging 507 with irregularities, a pressing process (e.g., embossing) can be performed. By making the film surface irregular, the flexibility of the secondary battery is improved, and stress is also mitigated. Embossing creates recesses or protrusions on the film surface (or the back of the film), forming a sealed space that can change its volume, sealed by the film as part of a wall serving as a sealing structure. In other words, the recesses or protrusions of the film form a serpentine structure (corrugated structure) within this sealed space. Note that embossing, one of the pressing processes, is not necessarily required; any method capable of forming an embossed pattern on a portion of the film can be used.

[0303] Note that one embodiment of the present invention is not limited thereto. Various embodiments of the invention are described in this and other embodiments, and one embodiment of the present invention is not limited to a specific embodiment. For example, an example of applying one embodiment of the present invention to a lithium-ion secondary battery is shown, but one embodiment of the present invention is not limited thereto. One embodiment of the present invention can be applied to various secondary batteries, lead-acid batteries, lithium-ion polymer secondary batteries, nickel-metal hydride batteries, nickel-cadmium batteries, nickel-iron batteries, nickel-zinc batteries, silver-zinc oxide batteries, solid-state batteries, air batteries, primary batteries, and capacitors or lithium-ion capacitors, etc. One embodiment of the present invention does not necessarily need to be applicable to lithium-ion secondary batteries.

[0304] The above are examples illustrating manufacturing methods.

[0305] At least a portion of this embodiment can be implemented in combination with any other embodiment described in this specification.

[0306] (Implementation Method 3)

[0307] In this embodiment, an example of a battery structure suitable for repeated bending and stretching is described.

[0308] Figure 19A A top view of battery 200 is shown. Figure 19B From Figure 19A The diagram shows the direction indicated by the dashed arrow in the image, representing the battery 200. Figure 19C Show along Figure 19A A schematic diagram of the cross-section of the cutting line A1-A2 in the diagram.

[0309] The battery 200 includes an outer packaging body 201, a laminated body 202 housed inside the outer packaging body 201, and tabs 203 electrically connected to the laminated body 202 and extending outside the outer packaging body 201. An electrolyte is also disposed in the area surrounded by the outer packaging body 201, in addition to the laminated body 202.

[0310] The outer packaging body 201 has a film shape, and opposite portions of the outer packaging body are folded in half, sandwiching the laminate 202. The outer packaging body 201 includes a folded portion 211, a pair of joints 213, and a joint 214. The pair of joints 213 may also be referred to as side seals. The joint 214 is located on one side of the tab 203 and may also be referred to as a top seal.

[0311] A portion of the outer packaging 201 that overlaps with the laminate 202 preferably has a wavy shape with alternating ridge lines 221 and valley lines 222. The joints 213 and 214 of the outer packaging 201 are preferably flat.

[0312] The laminate 202 has a structure in which electrodes 231 and 232 are alternately stacked. For example, each electrode 231 is used as one of the positive and negative electrodes, and each electrode 232 is used as the other of the positive and negative electrodes. Although not shown, an insulator may be provided between the electrodes 231 and 232.

[0313] like Figure 19C As shown, in the folded portion 211, a space 225 is preferably provided between the outer packaging body 201 and the stacked body 202.

[0314] Figure 19D A schematic cross-sectional view of battery 200 when bent is shown. Note that... Figure 19D Some of the constituent elements are not shown.

[0315] When the battery 200 is bent, a portion of the outer packaging 201 on the outer side of the bend extends, while another portion of the outer packaging 201 on the inner side of the bend deforms and shortens. More specifically, the portion of the outer packaging 201 on the outer side of the bend deforms in a manner that the wave amplitude decreases and the wave period length increases. On the other hand, the portion of the outer packaging 201 on the inner side of the bend deforms in a manner that the wave amplitude increases and the wave period length decreases. When the outer packaging 201 is deformed in the above manner, the stress applied to the outer packaging 201 by bending is mitigated, and therefore the outer packaging 201 itself does not necessarily need to be stretchable. As a result, the battery 200 can be bent with relatively little force without damaging the outer packaging 201.

[0316] like Figure 19D As shown, the laminate 202 deforms with the electrodes 231 and 232 offset relative to each other. At this time, the plurality of electrodes 231 and 232 included in the laminate 202 are fixed on one side of the joint 214, and therefore, they deform such that the offset increases as they approach the folding portion 211. This mitigates the stress applied to the laminate 202, so the electrodes 231 and 232 themselves do not necessarily need to be stretchable. As a result, the battery 200 can be bent without damaging the laminate 202.

[0317] Note that when using a solid electrolyte or a gel electrolyte, when the entire laminate 202 is covered by the electrolyte, the electrodes 231 and 232 are not easily misaligned, thus stress relief cannot be expected. Therefore, it is preferable to prepare and laminate multiple laminates, each of which includes an electrolyte layer between a pair of electrodes 231 and 232. This results in a structure where the electrodes 231 and 232 are misaligned even when using a solid electrolyte or a gel electrolyte.

[0318] In addition, when a space 225 is provided between the laminate 202 and the outer packaging 201, the electrodes 231 and 232 located inside the neutral surface of the outer packaging 201 can be staggered relative to each other in a manner that does not contact the outer packaging 201.

[0319] The battery illustrated in this embodiment is a battery that is not prone to damage to its outer packaging and laminates even when repeatedly bent and stretched, and whose battery characteristics are not easily degraded.

[0320] At least a portion of this embodiment can be implemented in combination with any other embodiment described in this specification.

[0321] [Example]

[0322] A battery module is manufactured using a manufacturing method according to one embodiment of the present invention. Here, the method illustrated in variation example 1 of embodiment 1 (see [reference]) is used. Figures 3A to 3E ).

[0323] First, a lithium-ion secondary battery is prepared. In this lithium-ion secondary battery, LiCoO2 is used as the positive electrode active material, graphite as the negative electrode active material, and an embossed aluminum laminate film is used as the outer packaging. Aluminum foil is used as the positive electrode current collector, with a layer of the positive electrode active material coated on one surface. Copper foil is used as the negative electrode current collector, with a layer of the negative electrode active material coated on one surface. The surface of the positive electrode current collector opposite to the coated surface is arranged to contact the surface of another positive electrode current collector. The positive electrode current collector is sandwiched between cellulose separators, and the cellulose separator is shaped into a bag shape. Polypropylene is formed by sandwiching the overlapping portions of the cellulose separator and then hot-pressed. Similarly, the surface of the negative electrode current collector opposite to the coated surface is arranged to contact the surface of another negative electrode current collector. Then, six positive electrode current collectors and six negative electrode current collectors are stacked with the coated surfaces of the positive and negative electrode current collectors facing each other to obtain an electrode laminate. The aluminum laminate film is folded in half to sandwich the electrode stack, and its three sides are joined together. The joining of the joints used to form the film is performed using a mold (heating rod). A heating rod with a flat surface is used for the side sealing parts, while a heating rod with a concave shape on a part of the surface overlapping the tab is used for the top sealing parts.

[0324] As the outer packaging, an aluminum laminate film with a thickness of approximately 50 μm is used, consisting of polypropylene, aluminum foil, and nylon layered sequentially. The aluminum laminate film is a wavy film embossed with a wave pattern of 2 mm intervals and a height difference of 0.5 mm between the raised and recessed portions.

[0325] First, a first molding process is performed to form a rubber molded body (first part) with a recess for inserting a lithium-ion secondary battery. In this first molding, a compounded fluororubber is used as the molding material. The molding is carried out at a temperature of 170°C and a pressure of 200 kgf / cm². 2 Under these conditions, a pressing cylinder with a diameter of 260mm is used for 10 minutes.

[0326] Next, a lithium-ion secondary battery is inserted into the recess of the rubber molded body (first part).

[0327] Next, the rubber molded body and the lithium-ion secondary battery are placed in a metal mold (second mold) for a second molding process to form the second part. The material used in the first molding is used as the molding material. The second molding is performed at a temperature of 160°C and a pressure of 30 kgf / cm². 2Under these conditions, a pressing cylinder with a diameter of 260mm is used for 10 minutes.

[0328] Through the above process, a battery module containing a lithium-ion secondary battery is obtained in a rubber molded body.

[0329] In one embodiment of the present invention, the outer packaging body is formed in two steps (first forming and second forming), thereby allowing for sufficient increase in temperature and pressure during the first forming. Therefore, the forming conditions for the first part, which is the main component of the outer packaging body, have a high degree of freedom, allowing it to be formed under optimized conditions. As a result, the outer packaging body can have an excellent appearance and high strength. During the second forming, the second part can be formed in a manner that only contacts the vicinity of the top sealing portion of the secondary battery, thereby utilizing higher forming pressure. Therefore, poor bonding, etc., can be prevented.

[0330] Figure 20A A photograph of the manufactured battery module is shown. As the photograph shows, the battery module can be easily bent with relatively little force.

[0331] Figure 20B The image shows a portion of the outer packaging cut off to expose the secondary battery. This confirms that the outer packaging of the secondary battery has not been crushed and has maintained its shape.

[0332] The above is a description of this embodiment.

[0333] Note that this embodiment can be appropriately combined with any other implementation described in this specification.

[0334] Symbol Explanation

[0335] 10: Battery module, 20: Outer packaging, 21: First part, 21a: Slit, 21b: Slit, 21c: Slit, 22: Second part, 23: Recess, 24: Open end, 25: Space, 26a: Hole, 26b: Hole, 30: Battery, 30a: Battery, 31: Outer packaging, 32: Tab, 33: Circuit board, 34: FPC, 35: Protective member, 35a: Plate-like part, 35b: Plate-like part, 35c: Joint, 41a: First part, 41 b: Part 1, 42: Part 2, 50a: Mold, 50b: Mold, 50c: Mold, 50d: Mold, 51a: Upper mold, 51b: Lower mold, 52a: Upper mold, 52b: Lower mold, 53: Mold core, 54a: Mold core, 54b: Mold core, 55a: Injection hole, 55b: Injection hole, 60: Battery module, 61: Belt section, 62: Belt section, 63: Holding section, 64: Operation button, 70: Frame, 71: Terminal, 72: Terminal, 75: Housing, 80: Electronic device, 81: frame, 82: display unit, 83: terminal, 84: terminal, 90: battery module, 91: housing, 91a: top cover, 91b: bottom cover, 92: terminal, 94: recess, 95: first part, 96: second part, 97: outer packaging, 102: secondary battery, 200: battery, 201: outer packaging, 202: laminated body, 203: tab, 211: folded part, 213: joint, 214: joint, 221: ridge, 22 2: Valley bottom line, 225: Space, 231: Electrode, 232: Electrode, 501: Positive current collector, 502: Positive active material layer, 503: Insulator, 503a: Junction, 504: Electrolyte, 505: Negative current collector, 506: Negative active material layer, 507: Outer packaging, 507a: Junction, 507b: Edge, 511: Positive electrode, 511a: Region, 515: Negative electrode, 520: Sealing layer, 521: Positive electrode wire, 525: Negative electrode wire.

[0336] This application is based on Japanese Patent Application No. 2016-080389, filed with the Japan Patent Office on April 13, 2016, the entire contents of which are incorporated herein by reference.

Claims

1. A battery module, comprising: A flexible battery having a pair of tabs protruding from a first side of the flexible battery; The flexible battery is disposed between the first plate and the second plate of the protective member; as well as A first flexible outer packaging body covers the flexible battery, the first plate, and the second plate. The first portion of the pair of tabs protrudes from the first flexible outer packaging body. The flexible battery, including the second flexible outer packaging, the first portion of the first plate, and the first portion of the second plate are fixed to each other near the first side of the flexible battery. The first flexible outer packaging body includes a first part and a second part surrounding the space, and Specifically, the pair of tabs of the second part of the first flexible outer packaging body and the end of the second flexible outer packaging body are in contact with each other.

2. A battery module, comprising: A flexible battery having a pair of tabs protruding from a first side of the flexible battery; The flexible battery is disposed between the first plate and the second plate of the protective member; as well as A first flexible outer packaging body covers the flexible battery, the first plate, and the second plate. The first portion of the pair of tabs protrudes from the first flexible outer packaging body. The flexible battery, including the second flexible outer packaging, the first portion of the first plate, and the first portion of the second plate are fixed to each other near the first side of the flexible battery. In this configuration, neither the second portion of the first plate nor each portion of the second portion of the second plate is fixed to the flexible battery. The first plate and the second plate have different lengths. The first flexible outer packaging body includes a first part and a second part surrounding the space, and Specifically, the pair of tabs of the second part of the first flexible outer packaging body and the end of the second flexible outer packaging body are in contact with each other.

3. A battery module, comprising: A flexible battery having a pair of tabs protruding from a first side of the flexible battery; The flexible battery is disposed between the first plate and the second plate of the protective member; as well as A first flexible outer packaging body covers the flexible battery, the first plate, and the second plate. The first portion of the pair of tabs protrudes from the first flexible outer packaging body. The flexible battery, including the second flexible outer packaging, the first portion of the first plate, and the first portion of the second plate are fixed to each other near the first side of the flexible battery. The first flexible outer packaging body includes a first gap where the first plate can be slidably fitted and a second gap where the second plate can be slidably fitted. The first flexible outer packaging body includes a first part and a second part surrounding the space, and Specifically, the pair of tabs of the second part of the first flexible outer packaging body and the end of the second flexible outer packaging body are in contact with each other.

4. The battery module according to claim 3, wherein, When the first flexible outer packaging body bends, the first plate slides along the first gap, and the second plate slides along the second gap.

5. A battery module, comprising: A flexible battery having a pair of tabs protruding from a first side of the flexible battery; A pair of plates clamp the flexible battery, the flexible battery including a first flexible outer packaging body; as well as A second flexible outer packaging body covers the flexible battery and the pair of plates. In this configuration, the first plate of the pair of plates faces the second plate of the pair of plates, and the second flexible outer packaging body is disposed between the first plate and the second plate. The first flexible outer packaging body includes a first part and a second part surrounding the space, and Specifically, the pair of tabs of the second part of the first flexible outer packaging body and the end of the second flexible outer packaging body are in contact with each other.

6. A method for manufacturing a battery module, the battery module comprising a flexible battery and a first flexible outer packaging covering the flexible battery, the method comprising the following steps: A first part of a first outer packaging body is formed by shaping a first material using a first mold, the first part having a recess; Prepare a battery including a second outer casing and a pair of tabs; The battery is inserted into the recess such that a portion of the pair of tabs protrudes beyond the opening of the recess; The first part, into which the battery is inserted, is disposed within the second mold; as well as The second part of the first outer packaging body is formed by shaping the second material using the second mold, thereby forming the first outer packaging body in which the first part and the second part are joined together at the open end. The first portion has a shape where it is obliquely cut off near the open end. The second part seals the opening end of the recess. The second portion contacts the end of the second outer packaging body, and a portion of the pair of tabs is exposed outside the second portion. Wherein, the first material and the second material are rubber, and The second outer packaging includes a portion that is not attached to the first portion.

7. A secondary battery, comprising: First outer packaging; The positive electrode provided in the first outer packaging body; The negative electrode provided in the first outer packaging body; Electrolytes provided in the first outer packaging; as well as A pair of polar ears, The first outer packaging is surrounded by a second outer packaging. The second outer packaging includes: Part One; Part Two; and The space enclosed by the first part and the second part, The second outer packaging body includes an elastic material. The first part and the second part are joined together. The pair of tabs are configured to protrude from the first end of the first outer packaging body. The first outer packaging body, the first board portion, and the second board portion are disposed within the space. The first outer packaging body is disposed between the first plate portion and the second plate portion. A portion of the first plate portion and a portion of the second plate portion are secured to the first outer packaging body near the first end. Wherein, another portion of the first plate portion and another portion of the second plate portion are not fixed to the first outer packaging body, and The second part of the second outer packaging body contacts the pair of tabs and the end of the first outer packaging body.

Images