Battery

Abstract

The utility model relates to a battery. Provided is a technique whereby a power generation element and a current collector can be accommodated in an accommodation body in a good state. A battery is provided with: an insulating housing body having a recessed housing part; a semisolid power generation element that is housed in the housing part and contains an electrolyte; and a current collector that is disposed between the inner surface of the housing part and the power generation element.

Description

Technical Field

[0001] The technology disclosed in this specification relates to batteries. Background Technology

[0002] Patent Document 1 discloses a battery. The battery of Patent Document 1 includes an insulating housing with a concave receiving portion and a power generation element housed in the receiving portion.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: International Publication No. 2014 / 112395 Utility Model Content

[0006] Problems to be solved by utility models

[0007] In Patent Document 1, the state in which the power generation element and current collector of the battery are housed in the housing is not specified. However, the state in which the power generation element and current collector are housed in the housing is important for improving battery performance. This specification provides a technique that enables the power generation element and current collector to be housed in a suitable state within the housing.

[0008] Solution for solving the problem

[0009] In the first technical solution of this technology, the battery comprises: an insulating housing having a concave housing portion; a semi-solid power generation element housed in the housing portion and containing an electrolyte; and a current collector disposed between the inner surface of the housing portion and the power generation element.

[0010] This structure improves the fit between the power generation element and the current collector housed in the housing, allowing them to be housed in a favorable condition. This, in turn, enhances battery performance.

[0011] In the second technical solution, based on the first technical solution described above, the current collector can also be bonded to the inner surface of the receiving portion using an adhesive. This structure can suppress positional displacement of the current collector and prevent wrinkles from forming in the current collector.

[0012] In the third technical solution, according to the first or second technical solution described above, the inner bottom surface of the receiving portion may have an inclined surface that slopes downwards from the center outwards. With this structure, power generation elements can be accommodated throughout the entire receiving portion.

[0013] In the fourth technical solution, according to any one of the first to third technical solutions mentioned above, at least a portion of the inner circumferential surface of the receiving portion may be provided with a concave-convex portion.

[0014] According to this structure, the gas generated by the power generation element (e.g., the gas generated in the degassing process of the power generation element) can be smoothly discharged to the outside of the container.

[0015] In the fifth technical solution, based on the fourth technical solution described above, the uneven portion can also be made of a material with heat-shrinkable properties. According to this structure, the uneven portion becomes flat through heat shrinkage, thereby increasing the amount of power generation per unit volume of the accommodating portion.

[0016] In the sixth technical solution of this invention, the battery comprises: an insulating housing having a concave receiving portion; a semi-solid power generating element housed in the receiving portion and containing an electrolyte; and a current collector disposed between the inner surface of the receiving portion and the power generating element. The manufacturing method of this battery includes a step of pressurizing the power generating element housed in the receiving portion toward the inner surface of the receiving portion.

[0017] According to this configuration, the tightness between the power generation element and the current collector housed in the housing can be improved, and the power generation element and the current collector can be housed in the housing in a good condition. As a result, the performance of the battery can be improved. Attached Figure Description

[0018] Figure 1 This is a top view of the battery in Example 1.

[0019] Figure 2 yes Figure 1 Sectional view II-II.

[0020] Figure 3 yes Figure 1 Sectional view III-III.

[0021] Figure 4 This is a diagram illustrating the manufacturing method of the battery in Example 1.

[0022] Figure 5 This is a cross-sectional view showing a portion of the structure of the battery in Example 2 in a disassembled state.

[0023] Figure 6 This is a cross-sectional view showing a portion of the structure of the battery in Example 3 in a disassembled state.

[0024] Figure 7 This is a cross-sectional view showing a portion of the structure of the battery in Example 4 in a disassembled state.

[0025] Figure 8 yes Figure 7 Sectional view of VIII-VIII.

[0026] Explanation of reference numerals in the attached figures

[0027] 2. Battery; 10. Positive electrode housing; 20. Negative electrode housing; 30. Positive electrode current collector; 40. Negative electrode current collector; 50. Positive electrode power generation element; 60. Negative electrode power generation element; 70. Separator; 80. Adhesive; 90. Uneven part; 100. Substrate; 101. First layer; 102. Second layer; 103. Third layer. Detailed Implementation

[0028] (Example 1)

[0029] The battery 2 of Embodiment 1 will be described with reference to the accompanying drawings. Figures 1-3 As shown, the battery 2 of Embodiment 1 includes an insulating positive electrode container 10, an insulating negative electrode container 20, and a separator 70 disposed between the positive electrode container 10 and the negative electrode container 20. Furthermore, the battery 2 includes a positive current collector 30 and a positive power generation element 50 housed in the positive electrode container 10, and a negative current collector 40 and a negative power generation element 60 housed in the negative electrode container 20.

[0030] The positive electrode container 10 has a concave receiving portion 12 and a peripheral portion 16 provided around the receiving portion 12. The peripheral portion 16 protrudes laterally from the upper end of the receiving portion 12.

[0031] The positive electrode container 10 is manufactured, for example, by processing an insulating substrate 100. The insulating substrate 100 is, for example, composed of a three-layer film. In this embodiment, the substrate 100 has a first layer 101, a second layer 102, and a third layer 103 sequentially from the inside of the positive electrode container 10.

[0032] The first layer 101 and the third layer 103 of the substrate 100 are insulating. The first layer 101 forms the inner surface of the positive electrode container 10. The third layer 103 forms the outer surface of the positive electrode container 10. The first layer 101 and the third layer 103 are made of, for example, a material containing one or more components selected from polyethylene, polypropylene, polystyrene, polyethylene terephthalate, polyvinyl chloride, silicone rubber, and fluoropolymers (e.g., polytetrafluoroethylene, perfluoroalkoxyalkanes, etc.). The first layer 101 and the third layer 103 may be made of the same material or different materials.

[0033] The second layer 102 of the substrate 100 is disposed between the first layer 101 and the third layer 103. The second layer 102 is made of a metal such as aluminum.

[0034] Next, the positive current collector 30 and the positive power generation element 50 housed in the positive electrode housing 10 will be described. The positive current collector 30 is a sheet-like component with conductivity. The positive current collector 30 is, for example, made of a metal foil, which is made of aluminum. The current collector portion 32 on the positive electrode side of the battery 2 includes the positive current collector 30 disposed along the inner surface 14 of the housing portion 12 of the positive electrode housing 10 and a terminal portion 36 disposed along the peripheral portion 16 of the positive electrode housing 10. The positive current collector 30 is disposed partially or entirely along the inner bottom surface 142 and the inner peripheral surface 144 of the housing portion 12. The positive current collector 30 is disposed between the inner surface 14 of the housing portion 12 and the positive power generation element 50.

[0035] Terminal portion 36 extends from the interior to the exterior of positive electrode housing 10. Terminal portion 36 is led out to the exterior of positive electrode housing 10 and exposed to the outside. Terminal portion 36 is held by peripheral portion 16 and separator 70 of positive electrode housing 10.

[0036] The positive electrode power generation element 50 is filled between the positive electrode housing 10 and the separator 70. The positive electrode power generation element 50 is filled between the positive electrode current collector 30 and the separator 70 of the current collector section 32.

[0037] The positive electrode power generation element 50 includes a positive electrode agent and an electrolyte. The positive electrode power generation element 50 is, for example, a power generation element in which a positive electrode agent is mixed in the electrolyte. The positive electrode power generation element 50 is contained in the receiving portion 12 of the positive electrode container 10 in a semi-solid state (e.g., gel, slurry, or clay).

[0038] The types of positive electrode additives and electrolytes are not specifically limited. Positive electrode additives and electrolytes may be, for example, those used in lithium-ion secondary batteries. Positive electrode additives may, for example, contain positive electrode active materials used in lithium-ion secondary batteries. Positive electrode active materials used in lithium-ion secondary batteries may, for example, contain lithium-containing metal oxides. Furthermore, positive electrode additives may also contain additives in addition to positive electrode active materials.

[0039] Next, the structure of the negative electrode side of battery 2 will be described. Since the structure of the negative electrode side of battery 2 is the same as that of the positive electrode side described above, detailed descriptions are sometimes omitted. The negative electrode housing 20 includes a concave housing portion 22 and a peripheral portion 26 provided around the housing portion 22. The peripheral portion 26 extends from the upper end of the housing portion 22 (at... Figure 2 The middle part (the lower end) protrudes to the side.

[0040] The negative electrode container 20 is manufactured, for example, by processing an insulating substrate 100. The insulating substrate 100 is, for example, composed of a three-layer film. The substrate 100 has a first layer 101, a second layer 102, and a third layer 103 sequentially from the inside of the negative electrode container 20. The structure of the substrate 100 is as described above.

[0041] The negative electrode current collector 40 is a conductive sheet-like component. The negative electrode current collector 40 is made of, for example, a metal foil, which is made of copper. The current collector portion 42 on the negative electrode side of the battery 2 includes the negative electrode current collector 40 disposed along the inner surface 24 of the receiving portion 22 of the negative electrode housing 20 and a terminal portion 46 disposed along the peripheral edge 26 of the negative electrode housing 20. The negative electrode current collector 40 is partially or entirely disposed along the inner bottom surface 242 and the inner peripheral surface 244 of the receiving portion 22. The negative electrode current collector 40 is disposed between the inner surface 24 of the receiving portion 22 and the negative electrode power generation element 60.

[0042] Terminal portion 46 extends from the interior to the exterior of negative electrode housing 20. Terminal portion 46 is led out to the exterior of negative electrode housing 20 and exposed to the outside. Terminal portion 46 is held by peripheral portion 26 of negative electrode housing 20 and separator 70.

[0043] The negative electrode power generation element 60 is filled between the negative electrode housing 20 and the separator 70. The negative electrode power generation element 60 is filled between the negative electrode current collector 40 and the separator 70 of the current collector section 42.

[0044] The negative electrode power generation element 60 comprises a negative electrode agent and an electrolyte. The negative electrode power generation element 60 is, for example, a power generation element in which a negative electrode agent is mixed in the electrolyte. The negative electrode power generation element 60 is contained in the receiving portion 22 of the negative electrode container 20 in a semi-solid state (e.g., gel, slurry, or clay).

[0045] The types of negative electrode additives and electrolytes are not specifically limited. For example, negative electrode additives and electrolytes are used in lithium-ion secondary batteries. For example, the negative electrode additive may contain negative electrode active materials used in lithium-ion secondary batteries. For example, the negative electrode active materials used in lithium-ion secondary batteries may contain carbon. Furthermore, in addition to containing negative electrode active materials, negative electrode additives may also contain additives, etc.

[0046] The positive electrode container 10 and the negative electrode container 2 of the battery 2 are assembled in a state where their respective receiving portions 12 and 22 are facing each other. A separator 70 is sandwiched between the positive electrode container 10 and the negative electrode container 20.

[0047] The separator 70 is held by the peripheral portion 16 of the positive electrode container 10 and the peripheral portion 26 of the negative electrode container 20. The peripheral portion 16 of the positive electrode container 10 and the peripheral portion 26 of the negative electrode container 20 are bonded to the separator 70, for example, by heat pressing.

[0048] The separator 70 is, for example, composed of an ion exchanger with ion exchange function. The ion exchanger is, for example, a substance containing one or more components selected from polyolefins, polyesters, cellulose, ceramics, and graphene. Alternatively, the ion exchanger may be Nafion (registered trademark).

[0049] (Manufacturing method of battery 2)

[0050] Next, the manufacturing method of battery 2 in Example 1 will be described. In the manufacturing method of battery 2, as follows... Figure 4 As shown, a positive current collector 30 is disposed along the inner surface 14 of the positive electrode container 10. Next, a positive power generation element 50 is disposed in the receiving portion 12 of the positive electrode container 10. The amount of the positive power generation element 50 is adjusted according to the capacity of the receiving portion 12.

[0051] Next, pressure is applied to the positive electrode power generation element 50 housed in the receiving portion 12 toward the inner surface 14 of the receiving portion 12. This allows the positive electrode power generation element 50 to be formed in accordance with the shape of the receiving portion 12. Alternatively, in a modified example, pressure may be applied to the positive electrode power generation element 50 after a spacer 70 is placed on top of the positive electrode power generation element 50, with the spacer 70 in between. The same process as for the positive electrode receiving body 10 is performed on the negative electrode receiving body 20.

[0052] Next, a separator 70 is placed between the positive electrode container 10 and the positive electrode power generation element 50 and the negative electrode container 20 and the negative electrode power generation element 60. Then, the positive electrode container 10 and the negative electrode container 20 are joined together with the separator 70 in between. Through the above steps, the battery 2 can be manufactured.

[0053] (Effect)

[0054] The battery 2 of Embodiment 1 has been described above. Based on the above description, it is clear that the battery 2 includes: an insulating positive electrode housing 10 having a concave housing portion 12; a semi-solid positive electrode power generation element 50 housed in the housing portion 12 and containing an electrolyte; and a positive electrode current collector 30 disposed between the inner surface 14 of the housing portion 12 and the positive electrode power generation element 50.

[0055] According to this structure, the tightness between the positive electrode power generation element 50 and the positive electrode current collector 30 housed in the housing portion 12 of the positive electrode housing 10 can be improved, and the positive electrode power generation element 50 and the positive electrode current collector 30 can be housed in the positive electrode housing 10 in a good state. The same applies to the structure on the negative electrode side. As a result, the performance of the battery 2 can be improved.

[0056] Furthermore, the manufacturing method of battery 2 includes a step of pressurizing the positive electrode power generation element 50 housed in the receiving portion 12 of the positive electrode container 10 toward the inner surface 14 of the receiving portion 12. According to this configuration, the tightness between the positive electrode power generation element 50 housed in the receiving portion 12 of the positive electrode container 10 and the positive electrode current collector 30 can be improved.

[0057] The above describes Embodiment 1, but the form of the battery 2 is not limited to the above embodiment. In the following description, detailed descriptions of the same structures as described above are sometimes omitted.

[0058] (Example 2)

[0059] In Example 2, as Figure 5 As shown, the positive current collector 30 is bonded to the inner surface 14 of the receiving portion 12 of the positive electrode housing 10. For example, the positive current collector 30 is bonded to the inner bottom surface 142 of the receiving portion 12 using an insulating adhesive 80. In a modified example, the positive current collector 30 may also be bonded to both the inner bottom surface 142 and the inner peripheral surface 144 of the receiving portion 12. Furthermore, the negative current collector 40 may have the same structure as the positive current collector 30.

[0060] Based on the above structure, it is possible to suppress the positional displacement of the positive current collector 30 and the formation of wrinkles in the positive current collector 30. The same applies to the structure on the negative side.

[0061] (Example 3)

[0062] In Example 3, as Figure 6 As shown, the inner bottom surface 142 of the receiving portion 12 of the positive electrode container 10 has an inclined surface 146 that slopes downward from the center outwards. The inclined surface 146 extends in a straight line from a cross-sectional view. In a modified example, the inclined surface 146 may extend in a curved shape from a cross-sectional view. For example, the inclined surface 146 may be a convex curve or a concave curve. Furthermore, the negative electrode container 20 may have the same structure as the positive electrode container 10.

[0063] Based on the above structure, the positive electrode power generation element 50 can be distributed throughout the entire housing 12. The same applies to the structure on the negative electrode side.

[0064] (Example 4)

[0065] In Example 4, as Figure 7 and Figure 8 As shown, a protrusion 90 is provided on the inner circumferential surface 144 of the receiving portion 12 of the positive electrode receiver 10. The protrusion 90 of the inner circumferential surface 144 of the receiving portion 12 is provided all around the circumference of the inner circumferential surface 144 of the receiving portion 12. In a modified example, it may only be provided on a portion of the inner circumferential surface 144 of the receiving portion 12. It is sufficient that the protrusion 90 of the inner circumferential surface 144 is provided on at least a portion of the inner circumferential surface 144 of the receiving portion 12. In addition, the negative electrode receiver 20 may have the same structure as the positive electrode receiver 10.

[0066] The uneven portion 90 provided on the inner peripheral surface 144 of the receiving portion 12 is made of a material with heat-shrinkability, for example. For instance, the uneven portion 90 is made of a material containing one or more components selected from polyethylene, polypropylene, polystyrene, polyethylene terephthalate, polyvinyl chloride, silicone rubber, and fluoropolymers (e.g., polytetrafluoroethylene, perfluoroalkoxyalkanes, etc.). Alternatively, the portion other than the uneven portion 90 may also be made of a material with heat-shrinkability. Or, the portion other than the uneven portion 90 may be made of a material without heat-shrinkability.

[0067] According to the above structure, the gas generated by the positive electrode power generation element 50 (for example, the gas generated in the degassing process of the positive electrode power generation element 50) can be smoothly discharged to the outside of the positive electrode container 10. Furthermore, the uneven portion 90 becomes flat due to thermal shrinkage, thereby shrinking the container portion 12 and increasing the density of the positive electrode power generation element 50 per unit volume. The same applies to the structure on the negative electrode side.

[0068] The above description details specific examples of this utility model, but these are merely illustrative and not intended to limit the scope of the claims. The technology described in the claims includes various modifications and variations of the specific examples described above. The technical elements illustrated in this specification or drawings are technically useful individually or in various combinations, and are not limited to the combinations described in the claims at the time of application. Furthermore, the technology illustrated in this specification or drawings can achieve multiple objectives simultaneously, and achieving one of these objectives is itself technically useful.

Claims

1. A battery, characterized in that, This battery has the following features: An insulating container having a concave receiving portion; A semi-solid power-generating element, contained within the container, and comprising an electrolyte; and A current collector is disposed between the inner surface of the housing and the power generation element.

2. The battery according to claim 1, characterized in that, The current collector is bonded to the inner surface of the receiving part using an adhesive.

3. The battery according to claim 1 or 2, characterized in that, The inner bottom surface of the receiving part has an inclined surface that slopes downward from the center outwards.

4. The battery according to claim 1 or 2, characterized in that, The inner circumferential surface of the receiving portion is provided with at least a portion of a protrusion or recess.

5. The battery according to claim 4, characterized in that, The irregular and irregular portions are made of a material with heat shrinkage properties.

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