Battery pack

Abstract

The utility model relates to a battery pack, the secondary battery is contained in the casing formed by upper casing and lower casing, it has: resin material, the arrangement between the peripheral portion of upper casing and the peripheral portion of lower casing makes the peripheral portion of upper casing and the peripheral portion of lower casing close contact, and fixed part, install in the peripheral portion of upper casing and the peripheral portion of lower casing in the way of being able to dismantle, the peripheral portion of upper casing and the peripheral portion of lower casing are clamped and fixed from the outside. Adopt the utility model, when disassembling the battery pack, the separation of casing is easy.

Description

Technical Field

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

[0002] Japanese Patent Application Publication No. 2024-043368 discloses an energy storage device in which the energy storage element is housed in a housing consisting of a housing body and a cover body, and the housing body and the cover body are joined together by bolts and adhesive.

[0003] However, when the housing body is joined to the cover by bolts and adhesives, the separation of the housing is difficult and time-consuming when disassembling the energy storage device. Utility Model Content

[0004] This utility model is proposed in view of the above-mentioned technical problems, and its purpose is to provide a battery pack whose casing can be easily separated during disassembly.

[0005] To solve the above-mentioned technical problems and achieve the objective, the battery pack of this utility model houses a secondary battery in a housing composed of an upper housing and a lower housing. It has: a resin material disposed between the peripheral portions of the upper housing and the peripheral portions of the lower housing, so that the peripheral portions of the upper housing and the peripheral portions of the lower housing are tightly fitted; and a fixing component detachably installed on the peripheral portions of the upper housing and the peripheral portions of the lower housing, clamping and fixing the peripheral portions of the upper housing and the peripheral portions of the lower housing from the outside.

[0006] According to the present invention, the battery pack can be easily separated from the casing during disassembly.

[0007] In addition, in the above structure, the fixing component can be a clip with a right-angled U-shaped cross-section.

[0008] Therefore, the fixing components that secure the periphery of the upper housing and the periphery of the lower housing can be easily installed and removed.

[0009] This invention provides the technical advantage of enabling easy separation of the casing during battery pack disassembly. Attached Figure Description

[0010] Figure 1 This is a cross-sectional view showing the general structure of the battery pack involved in this embodiment when viewed from the side.

[0011] Figure 2 (a) is a cross-sectional view of the housing joint before the resin material is tightly adhered to the flange of the upper housing and the flange of the lower housing. Figure 2(b) is a cross-sectional view of the housing joint after the resin material has been tightly bonded to the flange of the upper housing and the flange of the lower housing.

[0012] Figure 3 This is a cross-sectional view showing the housing joint where the metal clips are mounted. Detailed Implementation

[0013] The following describes the embodiments of the battery pack involved in this utility model. However, this utility model is not limited to these embodiments.

[0014] Figure 1 This is a cross-sectional view showing the general structure of the battery pack 1 according to this embodiment as viewed from the side. The battery pack 1 according to this embodiment is configured such that the battery assembly 3 is housed within a battery casing 2, which is composed of an upper casing 21 and a lower casing 22. The battery assembly 3 is, for example, composed of multiple battery cells stacked together. The battery cells are, for example, rechargeable secondary batteries, such as lithium-ion batteries.

[0015] Furthermore, in this embodiment, the length direction of the battery pack 1 is simply referred to as the "length direction". Additionally, in this embodiment, the height direction perpendicular to the length direction of the battery pack 1 is simply referred to as the "height direction". Moreover, in this embodiment, the length direction of the battery pack 1 is the same as the length direction of the battery casing 2 and the battery assembly 3, and the height direction of the battery pack 1 is the same as the height direction of the battery casing 2 and the battery assembly 3.

[0016] The upper housing 21 of the battery housing 2 has a top plate portion 210, a side plate portion 211, and a flange portion 212, and is box-shaped with a downward opening. The upper housing 21 is made of a metal material such as iron or aluminum. The top plate portion 210 of the upper housing 21 is formed as a flat plate and is disposed above the battery assembly 3. The side plate portion 211 of the upper housing 21 extends downward from the periphery of the top plate portion 210 and surrounds the periphery of the battery assembly 3. The flange portion 212 of the upper housing 21 is the periphery of the upper housing 21 and has a shape that protrudes outward along the length direction from the lower end of the side plate portion 211.

[0017] The lower housing 22 of the battery housing 2 has a base plate portion 220, a side plate portion 221, and a flange portion 222, and is box-shaped with an upward opening. The lower housing 22 is made of a metal material such as iron or aluminum. The base plate portion 220 is disposed below the battery assembly 3. The side plate portion 221 of the lower housing 22 rises upward from the periphery of the base plate portion 220 and surrounds the periphery of the battery assembly 3. The flange portion 222 of the lower housing 22 is the periphery of the lower housing 22 and has a shape that protrudes outward along the length direction from the upper end of the side plate portion 221.

[0018] The flange portion 212 of the upper housing 21 and the flange portion 222 of the lower housing 22 are opposite each other in the height direction. In the battery housing 2, a housing joint portion 23 is formed by joining the flange portion 212 of the upper housing 21 and the flange portion 222 of the lower housing 22. In the housing joint portion 23, a resin material 4 is disposed between the flange portion 212 of the upper housing 21 and the flange portion 222 of the lower housing 22. This resin material 4 serves as a sealing member to fill the gap between the flange portion 212 and the flange portion 222. Furthermore, a metal clip 5 with a roughly right-angled U-shaped cross-section is installed in the housing joint portion 23 as a fixing member. This metal clip 5 clamps and fixes the upper housing 21 and the lower housing 22 by covering their outer sides. The metal clip 5 is configured to be detachably mounted in the housing joint portion 23. Multiple metal clips 5 are mounted on the housing joint portion 23 along the circumference of the battery housing 2. In addition, the fixing component is not limited to the metal clip 5; for example, a resin clip with a cross-section roughly in the shape of a right angle U can also be used.

[0019] Figure 2 (a) is a cross-sectional view of the housing joint 23 before the resin material 4 is tightly attached to the flange portion 212 of the upper housing 21 and the flange portion 222 of the lower housing 22. Figure 2 (b) is a cross-sectional view of the housing joint 23 after the resin material 4 is tightly attached to the flange 212 of the upper housing 21 and the flange 222 of the lower housing 22.

[0020] like Figure 2 (a) and Figure 2 As shown in (b), the flange portion 212 of the upper housing 21 has a mating surface 212a facing downward in the height direction, a convex portion 212b protruding upward at its outer end, and an upper surface 212c located inside the convex portion 212b and facing upward. Similarly, the flange portion 222 of the lower housing 22 has a mating surface 222a facing upward in the height direction, a convex portion 222b protruding downward at its outer end, and a lower surface 222c located inside the convex portion 222b and facing downward. The mating surface 212a in the flange portion 212 of the upper housing 21 and the mating surface 222a in the flange portion 222 of the lower housing 22 are separated by the resin material 4 in the height direction.

[0021] The convex portion 212b of the flange portion 212 of the upper housing 21 protrudes upward in the height direction than the upper surface 212c, and serves to prevent the metal clip 5 from falling off, as described later. The upper surface 212c of the upper housing 21 is connected to the second arm portion 54a of the metal clip 5 (see below) as described later. Figure 3 ( ) The part that is pressed against and clamped.

[0022] The convex portion 222b of the flange portion 222 of the lower housing 22 protrudes downward in the height direction than the lower surface 222c, and serves to prevent the metal clip 5 from falling off, as described later. The lower surface 222c of the lower housing 22 is connected to the second arm portion 54b of the metal clip 5 (see below) as described later. Figure 3 ( ) The position that is pressed against and clamped.

[0023] Next, the step of filling the gap between the flange portion 212 and the flange portion 222 of the upper housing 21 and the lower housing 22 by tightly bonding them together with the resin material 4 in the housing joint 23 will be described.

[0024] First, such as Figure 2 As shown in (a), a resin material 4 of thickness A is disposed on the mating surface 222a of the flange portion 222 of the lower housing 22, and the mating surface 212a of the flange portion 212 of the upper housing 21 is placed on the resin material 4. Figure 2 In the state of the housing joint 23 shown in (a), the length dimension of the resin material 4 is shorter than the length dimension of the joint surface 212a of the flange portion 212 of the upper housing 21 and the joint surface 222a of the flange portion 222 of the lower housing 22.

[0025] Next, the resin material 4 is softened by heating with a heating device (not shown), and pressure is applied downward to the flange 212 of the upper housing 21 using a pressure device (not shown). Figure 2 As shown in (b), the resin material 4 is compressed to a thickness B (less than thickness A). As a result, the resin material 4 expands across the entire surface of the mating surfaces 212a and 222a, absorbing any ripples or other imperfections on the mating surfaces 212a and 222a, thereby ensuring a tight fit between the mating surfaces 212a and 222a. Thus, in the housing joint 23, by tightly adhering the resin material 4 to the flange portions 212 and 222, the resin material 4 can fill the gap between them. Furthermore, in the housing joint 23, as the heated and softened resin material 4 cools and hardens, the flange portions 212 and 222 are joined by the resin material 4.

[0026] Figure 3 This is a cross-sectional view showing the housing joint 23 where the metal clip 5 is mounted.

[0027] like Figure 3As shown, the metal clip 5, when assembled with the housing joint 23, is a right-angled U-shape symmetrical in the height direction (opening towards one side in the length direction), and has a leaf spring portion 51, first arm portions 52a and 52b, connecting portions 53a and 53b, and second arm portions 54a and 54b. The metal clip 5 is formed, for example, by bending a spring steel plate along the outline of the housing joint 23. The leaf spring portion 51 is a flat plate extending in the height direction. The first arm portions 52a and 52b are portions extending from both ends of the leaf spring portion 51 in the length direction and are shaped to match the convex portions 212b and 222b of the flange portions 212 and 222. The connecting portions 53a and 53b are portions that connect the first arm portions 52a and 52b to the second arm portions 54a and 54b. The second arm portions 54a and 54b are portions that extend along the length direction and have a shape that matches the upper surface 212c of the flange portions 212 and 222 and the lower surface 222c of the flange portion 222.

[0028] The metal clip 5 is inserted into the housing joint 23 from the outside along its length. The spring force of the leaf spring 51 causes the first arms 52a, 52b and the second arms 54a, 54b to clamp the flanges 212, 222, thereby assembling the metal clip 5 into the housing joint 23. With the metal clip 5 assembled into the housing joint 23, the connecting portions 53a, 53b of the metal clip 5 contact the convex portions 212b, 222b of the flanges 212, 222 along its length, thus preventing the metal clip 5 from detaching from the housing joint 23.

[0029] As described above, in the housing joint 23, after the flange portion 212 and the flange portion 222 are tightly bonded together using the resin material 4, the housing joint 23 is inserted into the metal clip 5 so that the metal clip 5 covers the outer sides of the flange portion 212 and the flange portion 222. Thus, the housing joint 23 is fixed by the metal clip 5 to prevent the flange portion 212 and the flange portion 222 from separating in the height direction. Therefore, in the battery pack 1 according to this embodiment, the flange portion 212 and the flange portion 222 of the housing joint 23 can be tightly bonded and fixed using the resin material 4 and the metal clip 5, thereby sealing the battery housing 2.

[0030] Furthermore, when disassembling the battery pack 1 according to this embodiment, firstly, resisting the elastic force of the leaf spring 51, extend the second arms 54a and 54b of the metal clip 5 away from the flanges 212 and 222, and pull the metal clip 5 outward along the length direction to remove it. Then, heat the resin material 4 using a heating device (not shown) to melt it, peel off the mating surface 212a of the upper housing 21 and the mating surface 222a of the lower housing 22, and remove the flange 212 of the upper housing 21 from the flange 222 of the lower housing 22. Thus, without using separation tools such as knives for peeling the tightly fitted mating surfaces 212a and 222a, the battery housing 2 can be separated into the upper housing 21 and the lower housing 22, thereby making it easy to disassemble the battery pack 1.

[0031] As described above, in the battery pack 1 of this embodiment, the battery casing 2 can be sealed by the resin material 4 and the metal clip 5, and the battery casing 2 can be easily separated during disassembly.

Claims

1. A battery pack comprising a secondary battery housed within a casing consisting of an upper casing and a lower casing, characterized in that, have: A resin material is disposed between the peripheral portion of the upper housing and the peripheral portion of the lower housing, so that the peripheral portion of the upper housing and the peripheral portion of the lower housing are tightly fitted together; and A fixing component is detachably installed on the periphery of the upper housing and the periphery of the lower housing, clamping and fixing the periphery of the upper housing and the periphery of the lower housing from the outside.

2. The battery pack according to claim 1, characterized in that, The fixing component is a clip with a right-angled U-shaped cross-section.

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