Battery pack

Abstract

To provide a battery pack that makes it easy to separate the case during disassembly. [Solution] The battery pack of the present invention is a battery pack in which a secondary battery is housed in a case composed of an upper case and a lower case, and comprises a resin material disposed between the peripheral edge of the upper case and the peripheral edge of the lower case to bring the peripheral edge of the upper case and the peripheral edge of the lower case into close contact, and a fixing member that is detachable from the peripheral edge of the upper case and the peripheral edge of the lower case to sandwich and fix the peripheral edge of the upper case and the peripheral edge of the lower case from the outside.

Description

【Technical Field】 【0001】 The present invention relates to a battery pack. 【Background Art】 【0002】 Patent Document 1 discloses a power storage device in which a power storage element is housed in a case composed of a case body and a lid body, and the case body and the lid body are joined to each other by screwing with bolts and adhesion with an adhesive. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Unexamined Patent Application Publication No. 2024-043368 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 However, when the case body and the lid body are joined by screwing with bolts and adhesion with an adhesive, it is difficult to separate the case when disassembling the power storage device, and it takes a long time. 【0005】 The present invention has been made in view of the above problems, and an object thereof is to provide a battery pack that can easily separate the case during disassembly. 【Means for Solving the Problems】 【0006】 To solve the above-mentioned problems and achieve the objective, the battery pack according to the present invention is a battery pack in which a secondary battery is housed in a case composed of an upper case and a lower case, and is characterized by comprising: a resin material disposed between the peripheral edge of the upper case and the peripheral edge of the lower case and making the peripheral edge of the upper case and the peripheral edge of the lower case tightly bonded together; and a fixing member that is detachably attached to the peripheral edge of the upper case and the peripheral edge of the lower case and fixes the peripheral edge of the upper case and the peripheral edge of the lower case by sandwiching them from the outside. 【0007】 As a result, the battery pack according to the present invention makes it easier to separate the case when disassembling it. 【0008】 Furthermore, in the above, the fixing member may be a clip with a substantially U-shaped cross-section. 【0009】 This makes it easy to attach and detach the fixing member to the peripheral edge of the upper case and the peripheral edge of the lower case. [Effects of the Invention] 【0010】 The battery pack according to the present invention has the effect of making it easier to separate the case during disassembly. [Brief explanation of the drawing] 【0011】 [Figure 1] Figure 1 is a cross-sectional view showing the schematic configuration of the battery pack according to the embodiment, as viewed from the side. [Figure 2] Figure 2(a) is a cross-sectional view showing the case joint before the resin material is applied to the flange portions of the upper and lower cases. Figure 2(b) is a cross-sectional view showing the case joint after the resin material has been applied to the flange portions of the upper and lower cases. [Figure 3] Figure 3 is a cross-sectional view showing the case joint with the metal clip attached. [Modes for carrying out the invention] 【0012】 The following describes an embodiment of the battery pack according to the present invention. However, the present invention is not limited to this embodiment. 【0013】 Figure 1 is a cross-sectional view showing the schematic configuration of a battery pack 1 according to an embodiment, viewed from the side. The battery pack 1 according to the embodiment is configured by housing a battery pack 3 in a battery case 2, which is composed of an upper case 21 and a lower case 22. The battery pack 3 is composed of, for example, multiple battery cells stacked together. The battery cells are, for example, rechargeable secondary batteries such as lithium-ion batteries. 【0014】 In this embodiment, the longitudinal direction of the battery pack 1 is also simply referred to as the "longitudinal direction." Furthermore, in this embodiment, the height direction perpendicular to the longitudinal direction of the battery pack 1 is also simply referred to as the "height direction." In addition, in this embodiment, the longitudinal direction of the battery pack 1 is the same as the longitudinal direction of the battery case 2 and the battery pack 3, and the height direction of the battery pack 1 is the same as the height direction of the battery case 2 and the battery pack 3. 【0015】 The upper case 21 of the battery case 2 has a top plate portion 210, side plate portions 211, and flange portion 212, and has a box-shaped form that opens downwards. The upper case 21 is made of a metal material such as iron or aluminum. The top plate portion 210 of the upper case 21 is formed, for example, in a flat shape and is positioned above the battery pack 3. The side plate portions 211 of the upper case 21 extend downwards from the periphery of the top plate portion 210 and surround the battery pack 3. The flange portion 212 of the upper case 21 is the periphery of the upper case 21 and has a shape that protrudes outward in the longitudinal direction from the lower end of the side plate portion 211. 【0016】 The lower case 22 of the battery case 2 has a bottom plate portion 220, side plate portions 221, and flange portions 222, and has a box-shaped form that opens upward. The lower case 22 is made of a metal material such as iron or aluminum. The bottom plate portion 220 is located below the battery pack 3. The side plate portions 221 of the lower case 22 rise from the periphery of the bottom plate portion 220 and surround the battery pack 3. The flange portions 222 of the lower case 22 are the periphery of the lower case 22 and have a shape that protrudes outward in the longitudinal direction from the upper end of the side plate portions 221. 【0017】 The flange portion 212 of the upper case 21 and the flange portion 222 of the lower case 22 face each other in the height direction. In the battery case 2, the flange portion 212 of the upper case 21 and the flange portion 222 of the lower case 22 are joined together to form a case joint portion 23. In the case joint portion 23, a resin material 4, which is a sealing member that closes the gap between the flange portion 212 of the upper case 21 and the flange portion 222 of the lower case 22, is placed between the flange portion 212 of the upper case 21 and the flange portion 222 of the lower case 22. In addition, a metal clip 5 with a roughly U-shaped cross-section is attached to the case joint portion 23, which is a fixing member that clamps and fixes the outside of the flange portion 212 of the upper case 21 and the flange portion 222 of the lower case 22. The metal clip 5 is configured to be detachably attached to the case joint portion 23. Multiple metal clips 5 are attached to the case joint portion 23 around the circumferential direction of the battery case 2. Furthermore, the fixing member is not limited to the metal clip 5; for example, a resin clip with a roughly U-shaped cross-section can also be used. 【0018】 Figure 2(a) is a cross-sectional view showing the case joint 23 before the resin material 4 is tightly adhered to the flange portion 212 of the upper case 21 and the flange portion 222 of the lower case 22. Figure 2(b) is a cross-sectional view showing the case joint 23 after the resin material 4 has been tightly adhered to the flange portion 212 of the upper case 21 and the flange portion 222 of the lower case 22. 【0019】 As shown in FIGS. 2(a) and 2(b), the flange portion 212 of the upper case 21 has a joint surface 212a facing downward in the height direction, a convex portion 212b protruding upward at the outer end, and an upper surface 212c facing upward inside the convex portion 212b. Further, the flange portion 222 of the lower case 22 has a joint surface 222a facing upward in the height direction, a convex portion 222b protruding downward at the outer end, and a lower surface 222c facing downward inside the convex portion 222b. The joint surface 212a in the flange portion 212 of the upper case 21 and the joint surface 222a in the flange portion 222 of the lower case 22 face each other with the resin material 4 sandwiched therebetween in the height direction. 【0020】 The convex portion 212b in the flange portion 212 of the upper case 21 protrudes upward from the upper surface 212c in the height direction and is a portion that functions as a retaining means for the metal clip 5 as described later. The upper surface 212c of the upper case 21 is a portion where the second arm portion 54a (see FIG. 3) of the metal clip 5 abuts and is sandwiched as described later. 【0021】 The convex portion 222b in the flange portion 222 of the lower case 22 protrudes downward from the lower surface 222c in the height direction and is a portion that functions as a retaining means for the metal clip 5 as described later. The lower surface 222c of the lower case 22 is a portion where the second arm portion 54b (see FIG. 3) of the metal clip 5 abuts and is sandwiched as described later. 【0022】 Next, a procedure for closely adhering the flange portion 212 of the upper case 21 and the flange portion 222 of the lower case 22 with the resin material 4 at the case joint portion 23 to close the gap between the flange portion 212 and the flange portion 222 will be described. 【0023】 First, as shown in Fig. 2(a), a resin material 4 with a thickness A in the height direction is arranged on the joint surface 222a of the flange portion 222 of the lower case 22, and the joint surface 212a of the flange portion 212 of the upper case 21 is placed on the resin material 4. In the state of the case joint portion 23 shown in Fig. 2(a), the length of the resin material 4 in the longitudinal direction is shorter than the respective longitudinal lengths of the joint surface 212a of the flange portion 212 of the upper case 21 and the joint surface 222a of the flange portion 222 of the lower case 22. 【0024】 Next, at least the resin material 4 is heated and softened using a heating device (not shown), and the flange portion 212 of the upper case 21 is pressed downward using a pressing device (not shown). As shown in Fig. 2(b), the resin material 4 is compressed so as to have a thickness B (< thickness A). As a result, the resin material 4 spreads over the entire surfaces of the joint surface 212a and the joint surface 222a, absorbs undulations and the like of the joint surface 212a and the joint surface 222a, and adheres to the joint surface 212a and the joint surface 222a. Thereby, in the case joint portion 23, the resin material 4 can be made to adhere to the flange portion 212 and the flange portion 222, and the gap between the flange portion 212 and the flange portion 222 can be blocked by the resin material 4. Further, in the case joint portion 23, as the heated and softened resin material 4 cools and hardens, the flange portion 212 and the flange portion 222 are joined by the resin material 4. 【0025】 Fig. 3 is a cross-sectional view showing the case joint portion 23 to which the metal clip 5 is attached. 【0026】 As shown in Figure 3, the metal clip 5, when attached to the case joint 23, is roughly U-shaped and symmetrical in the height direction, and has a leaf spring portion 51, first arm portions 52a, 52b, connecting portions 53a, 53b, and second arm portions 54a, 54b. The metal clip 5 is constructed, for example, by bending a spring steel plate or the like to conform to the outer shape of the case joint 23. The leaf spring portion 51 is a flat plate-shaped portion that extends in the height direction. The first arm portions 52a, 52b extend longitudinally from both ends of the leaf spring portion 51 and are shaped to conform to the convex portions 212b, 222b of the flange portions 212, 222. The connecting portions 53a, 53b are portions that connect the first arm portions 52a, 52b and the second arm portions 54a, 54b. The second arm portions 54a and 54b extend in the longitudinal direction and are shaped to follow the upper surface 212c and lower surface 222c of the flange portions 212 and 222. 【0027】 The metal clip 5 is inserted into the case joint 23 from the outside in the longitudinal direction, and the first arms 52a, 52b and the second arms 54a, 54b grip the flanges 212, 222 with the elastic force of the leaf spring portion 51, thereby attaching it to the case joint 23. When the metal clip 5 is attached to the case joint 23, the connecting portions 53a, 53b of the metal clip 5 come into contact with the convex portions 212b, 222b of the flanges 212, 222 in the longitudinal direction, thereby preventing the metal clip 5 from coming off the case joint 23. 【0028】 As described above, at the case joint 23, the flange portion 212 and the flange portion 222 are brought into close contact with the resin material 4, and then the metal clip 5 is inserted into the case joint 23 and attached so as to cover the outside of the flange portion 212 and the flange portion 222. In this way, the case joint 23 is fixed by the metal clip 5 so that the flange portion 212 and the flange portion 222 do not separate in the height direction. As a result, in the battery pack 1 according to this embodiment, the flange portion 212 and the flange portion 222 are brought into close contact and fixed at the case joint 23 by the resin material 4 and the metal clip 5, and the battery case 2 can be sealed. 【0029】 Furthermore, when disassembling the battery pack 1 according to this embodiment, first, the metal clip 5 is spread apart against the elastic force of the leaf spring portion 51 so that the second arm portions 54a and 54b are separated from the flange portions 212 and 222, and the metal clip 5 is pulled outward in the longitudinal direction relative to the case joint portion 23 to remove it. Then, the resin material 4 is heated and melted using a heating device (not shown) or the like to separate the joint surface 212a of the upper case 21 and the joint surface 222a of the lower case 22, and the flange portion 212 of the upper case 21 is removed from the flange portion 222 of the lower case 22. As a result, the battery case 2 can be separated into the upper case 21 and the lower case 22 without using a separation tool such as a cutting tool to separate the joint surfaces 212a and 222a that are tightly attached at the case joint portion 23, and the battery pack 1 can be easily disassembled. 【0030】 As described above, in the battery pack 1 according to this embodiment, the battery case 2 is sealed by the resin material 4 and the metal clip 5, and the battery case 2 can be easily separated when disassembling. [Explanation of Symbols] 【0031】 1 Battery pack 2 Battery Case 3 battery packs 4. Resin material 5 Metal clips 21 Upper Case 22 Lower Cases 23 Case joint 51 Leaf spring section 52a,52b First arm 53a, 53b Connection section 54a,54b Second arm 212,222 Flange section 210 Top panel 211,221 Side plate part 212a,222a joint surface 212b,222b Convex shaped part 212c top surface 220 Bottom plate part 222c bottom surface

Claims

[Claim 1] A battery pack in which a secondary battery is housed in a case composed of an upper case and a lower case, A resin material is positioned between the peripheral edge of the upper case and the peripheral edge of the lower case, and is used to tightly bond the peripheral edge of the upper case and the peripheral edge of the lower case. A fixing member that is detachably attached to the peripheral edge of the upper case and the peripheral edge of the lower case, which clamps and fixes the peripheral edge of the upper case and the peripheral edge of the lower case from the outside, A battery pack characterized by having the following features. [Claim 2] The battery pack according to claim 1, characterized in that the fixing member is a clip with a substantially U-shaped cross-section.

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