Battery

Abstract

The utility model relates to a battery which is provided with a laminated body formed by laminating electrode bodies and an outer frame arranged on the side surface, parallel to the laminating direction, of the laminated body, and the outer frame is provided with a plurality of liquid injection ports for injecting electrolyte into the battery and column parts arranged among the plurality of liquid injection ports. As a result, it is possible to provide a battery having excellent liquid injection performance by suppressing clogging of a liquid injection port for injecting an electrolyte solution.

Description

Technical Field

[0001] This utility model relates to a battery. Background Technology

[0002] For example, Patent Document 1 discloses a battery module having an electrode stack and a sealing body. The electrode stack has multiple electrodes stacked with a separator between them. The sealing body surrounds the electrode stack when viewed from the stacking direction of the multiple electrodes, sealing multiple internal spaces formed between adjacent electrodes in the stacking direction. Multiple connecting holes are provided on the side of the sealing body along the stacking direction, each communicating with one of the multiple internal spaces. At least partially, a first protrusion for increasing the thickness of the sealing body is provided in the portion of the first end of the sealing body on one side of the stacking direction that overlaps with the first connecting hole. At least partially, a second protrusion for increasing the thickness of the sealing body is provided in the portion of the second end of the sealing body on the other side of the stacking direction that overlaps with the second connecting hole. The first connecting hole is the connecting hole that communicates with the outermost internal space on one side when viewed from the stacking direction, and the second connecting hole is the connecting hole that communicates with the outermost internal space on the other side when viewed from the stacking direction.

[0003] Patent document 1: Japanese Patent Application Publication No. 2020-021544.

[0004] In the conventional battery shown in Patent Document 1, electrolyte is injected into the interior of the sealing body through multiple connecting holes formed on the side of the sealing body. However, in the conventional battery, there is a problem that the electrolyte injection performance is reduced due to the connecting holes becoming blocked during electrolyte injection. Utility Model Content

[0005] In view of the above, the technical problem to be solved by this utility model is how to provide a battery that has excellent electrolyte injection performance while suppressing the blockage of the electrolyte injection port.

[0006] The technical means used to solve the above-mentioned technical problems include the following methods.

[0007] The first embodiment is a battery having a stacked body formed by stacked electrode bodies and an outer frame disposed on a side of the stacked body parallel to the stacking direction. The outer frame has a plurality of injection ports for injecting electrolyte into the battery and a column disposed between the plurality of injection ports.

[0008] The second method is the battery according to the first method, wherein the outer frame further has a liquid injection frame surrounding the plurality of liquid injection ports.

[0009] The third method is a battery according to the first or second method, wherein the outer frame has two or more of the said pillars.

[0010] The fourth method is a battery according to any one of the methods 1 to 3, wherein the battery is a bipolar battery.

[0011] According to this invention, a battery with excellent electrolyte injection performance can be provided, which can suppress the clogging of the electrolyte injection port during electrolyte injection. Attached Figure Description

[0012] Figure 1 This is a schematic perspective view illustrating an example of the liquid injection port portion in one embodiment of the battery of this utility model.

[0013] Figure 2 This is a top view schematically showing the shape of the electrolyte inlet as viewed from the direction of electrolyte injection in one embodiment of the battery of this utility model.

[0014] Figure 3 This is a schematic cross-sectional view taken along a direction intersecting the length direction of the injection port in one embodiment of the battery of this utility model.

[0015] Figure 4 This is a schematic cross-sectional view showing the state of electrolyte injection in a section cut along a direction intersecting the length direction of the electrolyte injection port in the battery of this utility model.

[0016] Figure 5 It is a schematic cross-sectional view showing the state of electrolyte injection in a section cut along the direction intersecting the length direction of the injection port in an existing battery. Detailed Implementation

[0017] The following describes embodiments of this utility model. This specification is intended to illustrate the embodiments and not to limit the scope of this utility model.

[0018] In the numerical ranges described in this specification, the upper or lower limit value described in one numerical range can be replaced by the upper or lower limit value of other numerical ranges described in other stages. Furthermore, the upper or lower limit value of the numerical range described in this specification can be replaced by the value shown in the embodiments.

[0019] In this specification, the term "process" does not only include independent processes. Even if it cannot be clearly distinguished from other processes, as long as the desired purpose of the process is achieved, it is included in this term.

[0020] In this specification, embodiments are described with reference to the accompanying drawings, but the structure of these embodiments is not limited to the structures shown in the drawings. Furthermore, the sizes of the components in the figures are conceptual, and the relative sizes of the components are not limited thereto.

[0021] The battery of this invention comprises a stacked body formed by stacked electrode bodies and an outer frame disposed on a side parallel to the stacking direction of the stacked body. The outer frame has multiple injection ports for injecting electrolyte into the battery and pillars disposed between the multiple injection ports. In the battery of this invention, because pillars are disposed between the multiple injection ports, the outer frame is less prone to bending or deformation due to external forces compared to a single injection port without pillars. Therefore, the battery of this invention can prevent the injection ports from becoming blocked when electrolyte is injected into the battery, achieving excellent electrolyte injection performance.

[0022] The following description uses the accompanying drawings to illustrate the battery involved in the embodiments of this utility model.

[0023] Figure 1 This is a schematic perspective view illustrating the liquid injection port portion in one embodiment of the battery of the present invention. Figure 1 The battery 10 shown includes: a stacked body (not shown) formed by stacking multiple electrode bodies (not shown); an outer frame 18 disposed on a side of the stacked body parallel to the stacking direction; and an internal space (not shown) formed for each electrode body by a sealing member (not shown) or a spacer (not shown). In the battery 10, the multiple electrode bodies are respectively housed in the internal space. The outer frame 18 has multiple injection ports 12 for injecting electrolyte into the internal space formed inside the battery. Figure 1 The plurality of injection ports 12 shown are connected to one internal space. In the battery 10, each of the plurality of internal spaces is connected to a plurality of injection ports 12. The plurality of injection ports 12 are divided by pillars 24 formed in the outer frame 18.

[0024] Figure 2 This is a top view showing the main part of the outer frame 18 where the column portion 24 is formed. For example... Figure 2 As shown, the battery 10 of this invention has pillars 24 between multiple injection ports 12. These pillars 24 suppress deformation and blockage of the injection ports 12 caused by external forces applied during injection, resulting in excellent injection performance. Furthermore, in Figure 2 In the battery 10 shown, three liquid injection ports 12 are connected to one internal space, and a total of liquid injection ports 12 corresponding to two internal spaces are shown.

[0025] In one embodiment of the battery 10 of this utility model, as an example, the shape of the laminate when viewed from the thickness direction of the battery 10 (i.e., the stacking direction of the laminate) is rectangular. Furthermore, the term "rectangular" here includes not only cases of rectangles in the strict sense (e.g., rectangles, squares, etc.), but also cases where the overall shape is close to a rectangle. Therefore, the aforementioned "rectangular shape" also includes, for example, shapes that are close to rectangles with slightly rounded corners. Moreover, a rectangular battery can be one where the length of one side of the rectangle is 1000 mm or more in the longitudinal direction and 10000 mm or more in the transverse direction.

[0026] The outer frame 18 is shaped to cover the entire side of the laminate parallel to the lamination direction. The outer frame 18 can be manufactured by heat-welding sealing members or spacers disposed between multiple electrode bodies from the side direction of the laminate. Alternatively, the outer frame 18 can also be manufactured by heat-welding different sealing members from the side direction of the laminate having sealing members or spacers disposed between multiple electrode bodies. According to the outer frame 18, an internal space can be formed between adjacent electrode bodies in the laminate and the internal space can be sealed. In addition to the outer frame 18, other components can be disposed to cover the top or bottom surface of the laminate. In the battery 10 of this embodiment, the outer frame 18 is formed of resins such as polyethylene (PE), polypropylene (PP), polyphenylene sulfide (PPS), or modified polyphenylene ether (modified PPE).

[0027] In one embodiment of the battery 10 of this utility model, the liquid injection port 12 is provided to connect the interior of the battery 10 with the exterior by extending through the outer frame 18. The shape of the liquid injection port 12 is not particularly limited. However, from the viewpoint of liquid injection performance, the shape of the opening end of the liquid injection port 12 is preferably a rectangle whose longer side is at least twice the length of its shorter side, more preferably a rectangle whose longer side is at least three times the length of its shorter side, and particularly preferably a rectangle whose longer side is at least five times the length of its shorter side. Furthermore, the plurality of liquid injection ports 12 divided by the column portion 24 can each have the same shape or different shapes.

[0028] Here, as injection port 12, such as Figure 1 and Figure 2 As shown, an example is an opening with a generally rectangular shape. However, the injection port 12 is not limited to this shape and can be any shape. For example, the injection port 12 can be a wavy shape with alternating wide and narrow regions when viewed from the injection direction. By forming the injection port 12 into a wavy shape with alternating wide and narrow regions, deformation and closure can be suppressed even when external forces are applied. In addition, multiple injection ports 12 can all be the same shape or can be a variety of different shapes. For example, a portion of the multiple injection ports 12 can be formed with... Figure 1 and Figure 2 The generally rectangular opening shown has a wavy shape in which the remaining portions of the plurality of injection ports 12 are formed with alternating wide and narrow regions. The plurality of injection ports 12 may also be, for example, alternately arranged with a generally rectangular opening shape and an alternating wavy shape with wide and narrow regions.

[0029] like Figure 1 and Figure 2 As shown, in one embodiment of the battery 10 of this utility model, the plurality of liquid injection ports 12, which are divided by the column portion 24, are arranged in a row along the long side. However, the battery 10 of this embodiment is not limited to the configuration in which the plurality of liquid injection ports 12 are arranged in a row along the long side, but may also be configured in which the plurality of liquid injection ports 12 are arranged in multiple rows along the long side.

[0030] In addition, in one embodiment of the battery 10 of this utility model, the outer frame 18 is as follows: Figure 1 The battery also includes a filling frame 14 surrounding a plurality of filling ports 12. That is, the filling frame 14 is configured to completely surround the filling ports 12, which are divided into a plurality by the column portion 24. In other words, a group of filling ports 12, divided into a plurality by the column portion 24, is disposed within the area surrounded by the filling frame 14. The battery 10 of this embodiment is characterized by employing a configuration in which the filling ports 12 disposed within the area surrounded by the filling frame 14 are divided by the column portion 24, which differs from conventional batteries that have a single slit-shaped filling port without a column portion 24 in that area.

[0031] In one embodiment of the battery 10 of this utility model, the outer frame 18 preferably has two or more pillars 24. With two or more pillars 24, three or more liquid injection ports 12 are formed on the outer frame 18. Furthermore, by having two or more pillars 24 in the battery 10 of this embodiment and forming three or more liquid injection ports 12, superior liquid injection performance can be achieved. More preferably, three or more pillars 24 are present; even more preferably, five or more are present; and particularly preferably, five or more and 20 or less are present.

[0032] Here, the battery 10 of one embodiment of the present invention comprises a stacked body formed by stacked electrode bodies. In particular, the battery 10 of this embodiment is preferably a bipolar battery having a bipolar electrode with a positive electrode formed on one side of an electrode plate (not shown) and a negative electrode formed on the other side. The bipolar battery comprises a stacked body formed by stacking multiple bipolar electrodes with separators in between.

[0033] In one embodiment of the battery 10 of this utility model, the structure of the stacked body formed by stacking electrode bodies is not limited. For example, it can be the structure of the stacked body in the bipolar battery disclosed in Japanese Patent Application Publication No. 2020-21544. That is, Japanese Patent Application Publication No. 2020-21544 discloses a bipolar battery having a structure (multi-cell structure) with multiple stacked units (e.g., 24 units). This bipolar battery has a module body, and multiple connecting holes communicating with multiple internal spaces are opened on one side of the module body. When the battery 10 of this embodiment is applied to the bipolar battery disclosed in Japanese Patent Application Publication No. 2020-21544, the multiple connecting holes in the bipolar battery disclosed in Japanese Patent Application Publication No. 2020-21544 are equivalent to the multiple liquid injection ports 12 in this utility model, and these multiple connecting holes are divided into multiple parts by the column portion 24.

[0034] In the battery 10 of this embodiment, configured as described above, electrolyte 20 is injected into the interior of the outer frame 18 housing the laminate (not shown). Specifically, as... Figure 3 and Figure 4 As shown, electrolyte 20 is injected into the interior of the outer frame 18 using a liquid injection device. Additionally, Figure 3 This indicates the state before liquid injection using the injection device. Although the entire injection device is not shown, it includes a gasket 22 with a flow path for the electrolyte 20. The injection device connects the gasket 22 to the injection frame end 16 of the injection frame 14 (see reference). Figure 1 Contact is established. Furthermore, the injection device maintains the airtightness of the space formed by the gasket 22 and the injection frame 14 by pressing the gasket 22 towards the outer frame 18 with a predetermined pressure. In this state, the injection device supplies electrolyte 20 to the space formed by the gasket 22 and the injection frame 14 via a flow path formed in the gasket 22. The electrolyte 20 supplied to this space is injected into the interior of the outer frame 18 through the injection port 12.

[0035] Here, the electrolyte is the same as that of a typical liquid electrolyte. Examples include electrolytes such as LiPF6, LiBF4, LiAsF6, Li(CF3SO2)2N, Li(C2F5SO2)2N, LiTaF6, LiClO4, and LiCF3SO3, which are dissolved in a solvent. Examples of solvents include cyclic carbonate solvents such as ethylene carbonate (EC) and propylene carbonate (PC), and chain carbonate solvents such as dimethyl carbonate (DMC), diethyl carbonate (DEC), and ethyl methyl carbonate (EMC).

[0036] In the battery 10 according to this embodiment, even when the pad 22 is pressed to the point that the filling frame 14 bends, deformation of the outer frame 18, which closes the filling ports 12, can be suppressed because the pillars 24 are arranged between the plurality of filling ports 12. Assuming that in a conventional battery without the pillars 24, as... Figure 5 As shown, in battery 100, pressing the pad 22 causes the electrolyte injection frame 103 to bend, resulting in the electrolyte injection port 102 formed on the outer frame 101 being blocked due to the deformation of the outer frame 101. Therefore, in battery 100, it is difficult to inject electrolyte into the interior of the outer frame 101 from the electrolyte injection port 102. In contrast, in battery 10 according to this embodiment, no electrolyte is produced. Figure 5 The shown injection port 102 is blocked, so that electrolyte can be easily and reliably injected into the interior of the outer frame 18 through the injection port 12.

[0037] The battery 10, with electrolyte 20 injected as described above, is manufactured as a finished product through various processes constituting a conventional battery manufacturing method. The manufactured battery is typically a lithium-ion secondary battery. Examples of applications for the battery include power sources for vehicles such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), battery electric vehicles (BEVs), gasoline vehicles, and diesel vehicles. It is particularly preferred for use as a power source for driving hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), or battery electric vehicles (BEVs). Furthermore, the battery manufactured using the battery manufacturing method according to this invention can be used as a power source for mobile bodies other than vehicles (e.g., railway vehicles, ships, and aircraft), and also as a power source for electrical appliances such as information processing devices.

[0038] This utility model is not limited to the above-described embodiments. The above-described embodiments are illustrative, and any method having a substantially the same structure and achieving the same effect as the technical solution described in this utility model is included within the technical scope of this utility model.

Claims

1. A battery, characterized in that, A laminated body having laminated electrode bodies and an outer frame disposed on a side of the laminated body parallel to the lamination direction. The outer frame has multiple injection ports for injecting electrolyte into the battery and columns disposed between the multiple injection ports.

2. The battery according to claim 1, characterized in that, The outer frame also has an injection frame surrounding the plurality of injection ports.

3. The battery according to claim 1, characterized in that, The outer frame has two or more of the aforementioned columns.

4. The battery according to claim 1, characterized in that, The battery is a bipolar battery.

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