battery

Abstract

This utility model relates to a battery comprising: an outer casing having a rectangular flat bottom wall and a pair of main body walls integrally formed on the long side of the bottom wall; an electrode body housed within the outer casing; a cover disposed between the ends of the pair of main body walls opposite to the bottom wall; a first thermally conductive material disposed on the inner surface of the bottom wall; and a second thermally conductive material disposed on the inner surface of the cover. The thickness of the bottom wall is less than the thickness of the cover. The thickness of the first thermally conductive material is greater than the thickness of the second thermally conductive material. Using this utility model improves the battery's heat dissipation.

Description

Technical Field

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

[0002] A known all-solid-state battery that does not use an electrolyte is present in the prior art (see, for example, Japanese Patent Application Publication No. 2020-113496). To improve cooling efficiency, this all-solid-state battery employs the following structure: a heat transfer material is disposed on the lower surface of an electrode stack encapsulated in an outer casing material, and heat is dissipated through thermal conduction from this heat transfer material via the outer casing material.

[0003] However, there is still room for improvement in terms of heat dissipation for batteries with covers that seal the outer casing. Utility Model Content

[0004] The purpose of this invention is to obtain a battery that can improve heat dissipation.

[0005] To achieve the above objectives, the battery of the first embodiment of the present invention comprises: an outer casing having a rectangular flat bottom wall and a pair of main body walls integrally erected on the long side of the bottom wall; an electrode body housed in the outer casing; a cover body disposed between the ends of the pair of main body walls opposite to the bottom wall; a first thermally conductive material disposed on the inner surface of the bottom wall; and a second thermally conductive material disposed on the inner surface of the cover body, wherein the thickness of the bottom wall is smaller than the thickness of the cover body, and the thickness of the first thermally conductive material is larger than the thickness of the second thermally conductive material.

[0006] According to a first aspect of this invention, the outer casing housing the electrode has a rectangular flat bottom wall and a pair of main body walls integrally formed on the long side of the bottom wall. A first heat-conducting material is provided on the inner surface of the bottom wall. Furthermore, a cover is provided between the ends of the pair of main body walls opposite to the bottom wall, and a second heat-conducting material is provided on the inner surface of the cover. Here, the thickness of the bottom wall is thinner than the thickness of the cover, and the thickness of the first heat-conducting material is thicker than the thickness of the second heat-conducting material. Therefore, the heat dissipation of the outer casing, particularly the bottom wall side, is improved, and the battery is cooled efficiently.

[0007] In addition, the battery of the second embodiment of the present invention is provided with an insulating film thinner than the second heat-conducting material on the inner surface of the main body wall, as in the battery of the first embodiment.

[0008] According to the second aspect of this invention, an insulating film thinner than the second thermally conductive material is provided on the inner surface of the main body wall. Therefore, while suppressing the decrease in the volumetric energy density of the electrode body, the outer casing is effectively insulated from the electrode body.

[0009] In addition, in the third embodiment of the present invention, the main body wall is larger than the bottom wall in the first or second embodiment of the battery.

[0010] According to the third aspect of this invention, the main body wall is larger than the bottom wall. Therefore, compared to the case where the main body wall is smaller than the bottom wall, the reduction in the volumetric energy density of the electrode body can be suppressed.

[0011] In addition, the battery of the fourth embodiment of the present invention is, in any of the batteries of the first to third embodiments, wherein the electrode body has a terminal portion capable of closing the opening of the outer casing, wherein the opening is located on the short side of the bottom wall.

[0012] According to a fourth aspect of this invention, the electrode body has a terminal portion capable of closing the opening of the outer casing on the short side of the bottom wall. Therefore, by simply inserting the electrode body into the outer casing, the opening of the outer casing can be closed, resulting in easy assembly of the cover relative to the outer casing. That is, the assemblability of the outer casing and the cover is improved.

[0013] Furthermore, in the fifth embodiment of the present invention, the battery is, in any of the first to fourth embodiments, wherein the outer casing has protrusions extending from the ends of the pair of main body walls opposite to the bottom wall in a direction approaching each other, and the cover is formed in a convex shape having a narrow portion and a wide portion in a cross-sectional view viewed from the direction along the long side of the bottom wall, the narrow portion being held by the protrusions, and the outer surface of the narrow portion being coplanar with the outer surface of the protrusions.

[0014] According to a fifth aspect of the present invention, the outer casing has protrusions extending from the ends of a pair of main body walls opposite to the bottom wall in a direction approaching each other. Furthermore, the cover is formed into a convex shape having a narrow portion and a wide portion in a cross-sectional view viewed along the long side of the bottom wall of the outer casing. The narrow portion is held by the protrusions, and the outer surface of the narrow portion is coplanar with the outer surface of the protrusions. Therefore, for example, compared to the case where the outer surface of the protrusions protrudes more than the outer surface of the narrow portion, when cooling the battery by contacting the cover, it is easier to bring the cooling component into contact with the cover. Therefore, the battery is cooled efficiently.

[0015] As described above, the present invention can improve the heat dissipation of the battery. Attached Figure Description

[0016] Figure 1 This is a schematic perspective view showing the battery involved in this embodiment.

[0017] Figure 2 This is a schematic perspective view showing the electrode body of the battery according to this embodiment.

[0018] Figure 3 This is a schematic perspective view showing the outer casing of the battery according to this embodiment.

[0019] Figure 4 This is a schematic perspective view showing the cover of the battery according to this embodiment.

[0020] Figure 5 This is a schematic cross-sectional view showing the internal structure of the battery involved in this embodiment.

[0021] Figure 6 (A) to (E) are schematic process diagrams illustrating the battery manufacturing method according to this embodiment. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below with reference to the accompanying drawings. Furthermore, for ease of explanation, arrows UP (up) represent the top of the battery, FR (front) represent the front of the battery, and LH (left) represent the left side of the battery. Therefore, unless otherwise specified in the following description, the directions of up / down, front / back, and left / right refer to the up / down, front / back, and left / right directions within the battery; however, these directions are not intended to limit the scope of this utility model.

[0023] like Figure 1 As shown, the battery 10 in this embodiment is an all-solid-state battery, having: Figure 2 The electrode body 12 shown; the container housing the electrode body 12 Figure 3 The outer casing 20 shown; and the outer casing 20 that houses the electrode body 12, with its upper end (the end opposite to the bottom wall 22 described later) closed. Figure 4 The cover 30 is shown. Furthermore, both the outer body 20 and the cover 30 are made of metals such as aluminum alloy.

[0024] like Figure 2 As shown, the electrode body 12 is formed as a rectangular flat plate with its thickness along the rear-to-rear direction. Metal terminal portions 14 are pre-attached to the left and right sides of the electrode body 12 via welding or the like. The terminal portions 14 are formed to be slightly larger than the left and right sides of the electrode body 12, and are sized to close the opening 18 of the outer casing 20 (described later). Furthermore, on the outer surface of the terminal portions 14, a pair of electrode terminals 16 are integrally formed at predetermined intervals in the vertical direction, each protruding at a predetermined height and appearing approximately square when viewed from the left-right direction.

[0025] like Figure 3 As shown, the outer casing 20 has a rectangular flat bottom wall 22 extending along its length in the left-right direction, and a pair of main body walls 24 integrally formed on the long side of the bottom wall 22. The main body walls 24 are larger than the bottom wall 22, and the short side of the bottom wall 22 in the outer casing 20 is an opening 18. Furthermore, the thickness D of the bottom wall 22 (outer casing 20) is (refer to...) Figure 5 It is formed to be thinner than the thickness H2 of the wide portion 34 of the cover 30 (H2>D).

[0026] Furthermore, protrusions 26 extending in a mutually approaching direction are integrally formed on the upper ends (the ends opposite to the bottom wall 22) of the pair of main body walls 24. The protrusion lengths L of the protrusions 26 in the mutually approaching direction are the same. That is, a structure is formed in which the narrow portion 32 of the cover 30, which seals the upper end of the outer body 20, described later, is disposed at the center of the upper end of the main body wall 24 in the front-rear direction.

[0027] In addition, such as Figure 5 As shown, a first heat-conducting sheet 28, serving as a first heat-conducting material, is adhered to the inner surface (upper surface) of the bottom wall 22 of the outer casing 20, covering approximately the entire surface. The first heat-conducting sheet 28 is formed of an organosilicon-based resin material with a predetermined thickness D1 (thicker than the thickness D2 of the second heat-conducting sheet 38 described later: D1>D2). Furthermore, an insulating film 27, formed of unstretched polypropylene (CPP)-based resin material with a predetermined thickness D3 (thinner than the thickness D2 of the second heat-conducting sheet 38 described later: D2>D3), is adhered to the inner surface of the main body wall 24 of the outer casing 20, covering approximately the entire surface.

[0028] like Figure 4 As shown, the cover 30, in a cross-sectional view viewed along the long side of the bottom wall 22 of the outer casing 20, is formed in a convex shape with a narrow portion 32 and a wide portion 34 on the upper and lower sides, respectively. Figure 5 As shown, the width of the wide portion 34 constituting the lower side of the cover 30 along the front-back direction is the same as the spacing between the pair of main body walls 24, and the narrow portion 32 constituting the upper side of the cover 30 is formed at the center of the wide portion 34 in the width direction (front-back direction).

[0029] That is, half the difference between the width of the wide portion 34 and the width of the narrow portion 32 is the same as the extension length L of the protruding portion 26, and the cover 30 is configured such that when it is disposed at the upper end of the outer body 20 (between the upper ends of a pair of main body walls 24), its narrow portion 32 is clamped by the protruding portion 26 from the front-to-back direction (see reference). Figure 5 ).

[0030] In other words, the opposing end faces 26A of each protrusion 26 (refer to...) Figure 3 ) respectively with the narrow portion 32 facing the front and rear directions of the side 32A (refer to Figure 4 The protruding portion 26 abuts against the stepped portion 36 formed by the narrow portion 32 and the wide portion 34. In this state, the cover 30 is welded to the upper end of the outer body 20, thus sealing the upper end.

[0031] Furthermore, the upper surface (outer surface) of the narrow portion 32 and the upper surface (outer surface) of the protruding portion 26 are coplanar (see reference). Figure 5 That is, the thickness (height) H1 of the narrow portion 32 is the same as the plate thickness D of the protruding portion 26 (outer body 20) (H1=D). In addition, the thickness (height) H2 of the wide portion 34 is formed to be thicker than the thickness H1 of the narrow portion 32 (H2>H1).

[0032] In addition, such as Figure 5 As shown, on the lower surface of the wide portion 34 (the inner surface of the cover 30), a second heat-conducting sheet 38, which serves as a second heat-conducting material, is attached to the surface of approximately the entire surface. The second heat-conducting sheet 38 is formed of an organosilicon-based resin material with a specified thickness D2 (thinner than the thickness D1 of the first heat-conducting sheet 28: D1>D2).

[0033] Furthermore, in this embodiment, the thickness D1 of the first heat-conducting sheet 28 is the sum of the thickness H2 of the wide portion 34 of the cover 30 and the thickness D2 of the second heat-conducting sheet 38. Specifically, as an example, let H2 = D2 = 1 mm and D1 = 2 mm. This configuration ensures the strength of the battery 10 while suppressing the decrease in the volumetric energy density of the electrode body 12. Additionally, the thermal conductivity of the first heat-conducting sheet 28 and the second heat-conducting sheet 38 is higher than that of the insulating film 27, exceeding 1.5 W / (m·K).

[0034] The function (manufacturing method) of the battery 10 of this embodiment, configured as described above, will now be explained.

[0035] First, such as Figure 6 As shown in (A), in the outer casing 20, a first heat-conducting sheet 28 is attached to the inner surface of the bottom wall 22, and an insulating film 27 is attached to the inner surface of the main body wall 24. Then, as... Figure 6 As shown in (B), the protrusion 26 of the outer casing 20 is moved in a direction of separation to enlarge the upper end of the outer casing 20 (opening process), and the electrode body 12 is inserted into the outer casing 20 after it has been enlarged from the top (electrode body insertion process). Figure 6 (C) shows the state in which the electrode body 12 is inserted (accommodated) in the outer casing 20.

[0036] Next, as Figure 6 As shown in (D), a cover 30 is inserted into the upper end of the outer casing 20, which houses the electrode body 12 (cover insertion process). Furthermore, a second heat-conducting sheet 38 is pre-attached to the lower surface of the wide portion 34 of the cover 30. Although the illustration is omitted, it is similar to... Figure 6 As shown in (B), the upper end of the outer body 20 is enlarged by moving the protrusion 26 of the outer body 20 in a direction of separation from each other, and the cover 30 is inserted.

[0037] Thus, after inserting the cover 30 into the upper end of the outer casing 20 (the upper side of the electrode body 12), as... Figure 6 As shown in (E), the protrusions 26 are moved toward each other, and the protrusions 26 clamp the narrow portion 32 in the cover 30, sealing the upper end of the outer casing 20 (sealing process). That is, at the end face 26A of each protrusion 26 (refer to...) Figure 3 ) abutting against each side 32A of the narrow section 32 (refer to Figure 4 In the state of being sealed, the cover 30 is joined (sealed) to the upper end of the outer body 20 by welding.

[0038] Additionally, at this time, the terminal portions 14 provided on the left and right sides of the electrode body 12 (refer to...) Figure 1 , Figure 2 The outer casing 20 is also sealed by welding to the left and right edges of the bottom wall 22 and the main body wall 24 and the ends of the cover 30 on both sides. This is how it is manufactured. Figure 1 Battery 10 is shown.

[0039] Here, the thickness D of the bottom wall 22 is thinner than the thickness H2 of the wide portion 34 of the cover 30 (H2>D), and the thickness D1 of the first heat-conducting sheet 28 is thicker than the thickness D2 of the second heat-conducting sheet 38 (D1>D2). Therefore, the heat dissipation of the outer casing 20, especially the bottom wall 22 side, can be improved, and the battery 10 can be cooled (heat dissipated) efficiently.

[0040] Furthermore, since the main body wall 24 is larger than the bottom wall 22, the reduction in volumetric energy density of the electrode body 12 can be suppressed compared to the case where the main body wall 24 is smaller than the bottom wall 22. Moreover, an insulating film 27, thinner than the second heat-conducting sheet 38, is provided on the inner surface of each main body wall 24, thus suppressing the reduction in volumetric energy density of the electrode body 12 and effectively insulating the outer casing 20 from the electrode body 12.

[0041] Furthermore, since the insulating film 27 only needs to be adhered to the inner surface of each main body wall 24, compared to the case where the insulating film 27 is wound around the electrode body 12, the amount of insulating film 27 used can be reduced, and the electrode body 12 can be made in close contact with the insulating film 27. Therefore, compared to the case where the insulating film 27 is wound around the electrode body 12, i.e., a gap is formed between the electrode body 12 and the insulating film 27, heat dissipation can be improved, and the battery 10 can be cooled (heat dissipated) efficiently.

[0042] Furthermore, the upper surface of the narrow portion 32 of the cover 30 is coplanar with the upper surface of the protrusion 26 of the outer casing 20. Therefore, for example, compared to the case where the upper surface of the protrusion 26 protrudes upwards compared to the upper surface of the narrow portion 32, when the cooling component (not shown) contacts the cover 30 to cool (dissipate heat) the battery 10, it is easier to make the cooling component contact the cover 30 (the upper surface of the narrow portion 32). Therefore, the battery 10 can be cooled efficiently.

[0043] In addition, the battery 10 is configured to hold the electrode body 12 by clamping it between the first heat-conducting sheet 28 provided on the inner surface of the bottom wall 22 of the outer casing 20 and the second heat-conducting sheet 38 provided on the lower surface of the wide portion 34 of the cover body 30. Therefore, the electrode body 12 can be effectively and tightly attached to the outer casing 20 for fixation.

[0044] Furthermore, in the cover 30, the thickness H2 of the wide portion 34 is made thicker than the thickness H1 of the narrow portion 32 (H2>H1). Therefore, even if the plate thickness D of the outer body 20 (especially the protrusion 26) is thin, damage to the electrode body 12 can be prevented when the cover 30 is welded to the outer body 20.

[0045] Furthermore, the electrode body 12 has a terminal portion 14 capable of closing the opening 18 of the outer casing 20. In other words, installation based on soldering the terminal portion 14 to the electrode body 12 can be performed before the electrode body 12 is inserted into the outer casing 20. Therefore, compared to the case where the terminal portion 14 is soldered to the electrode body 12 after the electrode body 12 is inserted into the outer casing 20, the generation of foreign matter or fumes can be suppressed.

[0046] Furthermore, since the electrode body 12 is pre-equipped with a terminal portion 14 capable of closing the opening 18 of the outer casing 20, the opening 18 can be closed simply by inserting the electrode body 12 into the outer casing 20. That is, since the cover 30 is also welded to the terminal portion 14, it is easy to position and assemble the cover 30 relative to the outer casing 20, thereby improving the assemblability of the outer casing 20 and the cover 30.

[0047] The battery 10 of this embodiment has been described above based on the accompanying drawings. However, the battery 10 of this embodiment is not limited to the content shown in the drawings, and appropriate design changes can be made without departing from the spirit of this utility model. For example, the length of the battery 10 in the left-right direction, the length (height) in the up-down direction, and the length (thickness) in the front-back direction are not limited to the lengths shown in the drawings.

[0048] Furthermore, the width (length) of the narrow portion 32 of the cover 30 along the front-to-back direction or the extension length L of the protrusion 26 of the outer body 20 is exaggerated in each figure, and is not limited to the length shown in the figure. Therefore, for example, the width (length) of the narrow portion 32 along the front-to-back direction can also be set to a width (length) that is more than twice the extension length L of the protrusion 26.

Claims

1. A battery, characterized in that, have: The outer casing has a rectangular flat bottom wall and a pair of main body walls integrally erected on the long side of the bottom wall; The electrode body is housed within the outer casing; A cover is disposed between the ends of the pair of main walls opposite to the bottom wall; A first heat-conducting material is disposed on the inner surface of the bottom wall; and A second heat-conducting material is disposed on the inner surface of the cover. The thickness of the bottom wall is smaller than the thickness of the cover. The thickness of the first thermally conductive material is greater than the thickness of the second thermally conductive material.

2. The battery according to claim 1, characterized in that, An insulating film thinner than the second heat-conducting material is provided on the inner surface of the main body wall.

3. The battery according to claim 1 or 2, characterized in that, The main wall is larger than the bottom wall.

4. The battery according to claim 1 or 2, characterized by The electrode body has a terminal portion capable of closing the opening of the outer casing, wherein the opening is located on the short side of the bottom wall.

5. The battery according to claim 1 or 2, characterized by The outer casing has protrusions extending from the ends of the pair of main body walls on the opposite side of the bottom wall in a direction that approaches each other. The cover is formed in a convex shape with a narrow portion and a wide portion in a cross-sectional view viewed from the direction along the long side of the bottom wall. The narrow portion is held by the protruding portion, and the outer surface of the narrow portion is coplanar with the outer surface of the protruding portion.

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