Assembly structure for top cover and roll core of square aluminum shell battery

Abstract

The utility model relates to an assembling structure of a top cover and a roll core of a square aluminum shell battery, which comprises the top cover and the roll core, the top cover comprises a top cover substrate, a pole and lower plastic, the pole and the lower plastic are arranged on the top cover substrate, the pole comprises a positive pole and a negative pole, the roll core is respectively provided with a positive lug and a negative lug, and the positive lug and the negative lug are arranged on the top cover substrate. The positive lug and the bottom surface of the positive pole are respectively connected with the upper surface of the positive connecting piece, and the negative lug and the bottom surface of the negative pole are respectively connected with the upper surface of the negative connecting piece. According to the assembly structure of the top cover and the roll core, the roll core, the connecting piece, the tab and the pole of the cover plate are sequentially arranged from bottom to top, the distance space between the bottom surface of the pole and the bottom surface of the lower plastic cement is fully utilized, the space utilization rate of the battery is improved, meanwhile, the tab has a larger space bending, a diaphragm of the roll core is not easy to collapse, and the service life of the battery is prolonged. And the risk of positive and negative electrode short circuit is reduced to a great extent.

Description

Technical Field

[0001] The utility model belongs to the technical field of ion batteries, and in particular relates to an assembly structure of a square aluminum shell battery top cover and a winding core. Background Art

[0002] As a green power source, ion batteries are widely used in power storage, household energy storage, transportation and other fields due to their advantages such as small size, pollution-free and low cost. Among them, square aluminum shell batteries are widely studied and developed on a large scale due to their high capacity and excellent performance.

[0003] For square aluminum shell batteries, we must especially consider safety and space utilization. For traditional square aluminum shell batteries, the assembly structure of the top cover and the core is generally from bottom to top, the core, the pole ear, the connecting piece, and the bottom surface of the pole column of the top cover, where the connecting piece connects the pole ear and the bottom surface of the pole column of the top cover respectively, but the pole column passes through the lower plastic and the bottom surface of the pole column is usually higher than the lower plastic, that is, from the height direction, there is a certain distance between the bottom surface of the pole column and the lower plastic. According to the traditional assembly position, this part of the space cannot be effectively utilized. It is necessary to reserve a large space between the core and the cover plate for assembly during assembly, and the bending amplitude of the pole ear is large, the pole ear is easy to collapse the diaphragm, and the bending pokes into the end surface of the core, which is easy to cause a short circuit.

[0004] Chinese patent CN 201821345120.5 discloses an assembly structure of a power battery top cover and a battery cell, including a top cover and a battery cell, wherein the top cover is provided with a first pole and a second pole, and the battery cell is provided with a first pole ear and a second pole ear, wherein the first pole ear is electrically connected to the first pole via a first connecting sheet, and the second pole ear is electrically connected to the second pole via a second connecting sheet. Chinese patent CN201920260616.0 discloses a laminated battery core structure and a lithium-ion battery, wherein the laminated battery core structure comprises: a core portion, the core portion comprising a plurality of cores stacked and arranged along the thickness direction of the core portion, wherein each of the cores is respectively provided with a positive electrode ear and a negative electrode ear; a positive electrode connecting sheet, the positive electrode connecting sheet comprising: a positive electrode column connecting section connected to the positive electrode column of the battery and a positive electrode ear connecting section connected to the positive electrode ear; and a negative electrode connecting sheet, the negative electrode connecting sheet comprising: a negative electrode column connecting section connected to the negative electrode column of the battery and a negative electrode ear connecting section connected to the negative electrode ear. In the above two patents, the assembly structure of the top cover and the winding core is, from bottom to top, the winding core, the pole ear, the connecting piece, and the bottom surface of the pole of the top cover. There is a certain distance in height between the bottom surface of the pole and the lower plastic. During assembly, a large space needs to be reserved between the winding core and the cover plate for assembly. In addition, the bending amplitude of the pole ear is large, and the pole ear is easy to collapse the diaphragm. The bending may poke into the end surface of the winding core, which may easily cause a short circuit. Summary of the invention

[0005] The utility model aims to provide an assembly structure of a square aluminum shell battery top cover and a winding core, which can save the internal assembly space of the battery and reduce the short circuit rate of the positive and negative electrodes.

[0006] The technical solution adopted by the utility model to solve the above-mentioned problem is: an assembly structure of a square aluminum shell battery top cover and a winding core, including a top cover and a winding core, the top cover includes a top cover substrate and a pole column and a lower plastic installed on the top cover substrate, the pole column includes a positive pole column and a negative pole column, the winding core is provided with pole ears, and the pole ears are respectively a positive pole ear and a negative pole ear, the positive pole ear and the bottom surface of the positive pole column are respectively connected to the upper surface of the positive electrode connecting piece, and the negative pole ear and the bottom surface of the negative pole column are respectively connected to the upper surface of the negative electrode connecting piece.

[0007] Preferably, the pole passes through the lower plastic and a bottom surface of the pole is at a distance from a bottom surface of the lower plastic.

[0008] More preferably, the distance between the bottom surface of the pole and the bottom surface of the lower plastic is greater than the thickness of the pole ear, and the positive electrode connecting plate and the negative electrode connecting plate both include an ultrasonic welding portion and a laser welding portion formed by horizontally extending one end of the ultrasonic welding portion, that is, the ultrasonic welding portion and the laser welding portion are on the same horizontal plane.

[0009] More preferably, the distance between the bottom surface of the pole and the bottom surface of the lower plastic is not greater than the thickness of the pole ear, and the positive electrode connecting plate and the negative electrode connecting plate both include an ultrasonic welding portion and a laser welding portion formed by protruding from one end of the ultrasonic welding portion, that is, the ultrasonic welding portion and the laser welding portion are stepped.

[0010] More preferably, the positive electrode connecting sheet includes an ultrasonic welding portion connected to the positive electrode ear and a laser welding portion connected to the bottom surface of the positive electrode column.

[0011] More preferably, the negative electrode connecting sheet includes an ultrasonic welding portion connected to the negative electrode ear and a laser welding portion connected to the bottom surface of the negative electrode column.

[0012] Compared with the prior art, the advantages of the utility model are:

[0013] In the assembly structure of the top cover and the winding core of the square aluminum shell battery of the utility model, the positive pole ear and the bottom surface of the positive pole column are respectively connected to the upper surface of the positive pole connecting piece, and the negative pole ear and the bottom surface of the negative pole column are respectively connected to the upper surface of the negative pole connecting piece, so that the pole column of the winding core, the connecting piece, the pole ear and the top cover are arranged in sequence from bottom to top, and the distance space between the bottom surface of the pole column and the lower plastic bottom surface is fully utilized, thereby improving the space utilization rate of the battery. At the same time, the pole ear has a larger space for bending, and it is not easy to collapse the diaphragm of the winding core, thereby greatly reducing the risk of short circuit between the positive and negative poles. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is a cross-sectional view of the assembly structure of the square aluminum shell battery top cover and the winding core in the embodiment of the utility model.

[0015] Figure 2 It is a schematic structural diagram of a square aluminum shell battery top cover in an embodiment of the utility model.

[0016] Figure 3 It is a schematic structural diagram of the connection between the winding core and the connecting piece in the embodiment of the utility model.

[0017] Figure 4 Schematic diagram of the assembly of the connecting piece and the top cover during laser welding in an embodiment of the present invention.

[0018] Figure 5 This is an exploded view of the assembly structure of the square aluminum shell battery top cover and the winding core in an embodiment of the present invention.

[0019] Among them: 1 is the top cover, 1.1 is the top cover substrate, 1.2 is the pole, 1.2.1 is the positive pole, 1.2.2 is the negative pole, 1.3 is the lower plastic, 2 is the winding core, 2.1 is the positive ear, 2.2 is the negative ear, 3 is the connecting piece, 3.1 is the positive connecting piece, 3.2 is the negative connecting piece, 4.1 is the ultrasonic welding part, and 4.2 is the laser welding part. DETAILED DESCRIPTION

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] like Figure 1-3 As shown, there are a cross-sectional view of the assembly structure of the top cover and the winding core in this embodiment, a structural schematic diagram of the top cover in this embodiment, and a structural schematic diagram of the connection between the winding core and the connecting piece in this embodiment.

[0022] A square aluminum shell battery top cover and winding core assembly structure, including a top cover 1 and a winding core 2, the top cover 1 includes a top cover substrate 1.1 and a pole 1.2 and a lower plastic 1.3 installed on the top cover substrate 1.1, the pole 1.2 includes a positive pole 1.2.1 and a negative pole 1.2.2, the number of the winding cores 2 is two, the two winding cores 2 are respectively provided with a positive pole ear 2.1 and a negative pole ear 2.2, the connecting piece 3 includes a positive pole connecting piece 3.1 and a negative pole connecting piece 3.2, the positive pole ear 2.1 and the bottom surface of the positive pole 1.2.1 are respectively connected to the upper surface of the positive pole connecting piece 3.1, the negative pole ear 2.2 and the bottom surface of the negative pole 1.2.2 are respectively connected to the upper surface of the negative pole connecting piece 3.2.

[0023] The pole 1.2 passes through the lower plastic 1.3 and there is a distance between the bottom surface of the pole 1.2 and the bottom surface of the lower plastic 1.3. The distance between the bottom surface of the pole 1.2 and the bottom surface of the lower plastic 1.3 is equal to the thickness of the pole ear (wherein, the thickness of the positive pole ear 2.1 and the negative pole ear 2.2 is the larger one). The positive electrode connecting sheet 3.1 and the negative electrode connecting sheet 3.2 both include an ultrasonic welding portion 4.1 and a laser welding portion 4.2 formed by protruding from one end of the ultrasonic welding portion 4.1, that is, the ultrasonic welding portion 4.1 and the laser welding portion 4.2 are stepped.

[0024] The positive electrode connecting sheet 3.1 includes an ultrasonic welding portion 4.1 connected to the positive electrode tab 2.1 and a laser welding portion 4.2 connected to the bottom surface of the positive electrode column 1.2.1.

[0025] The negative electrode connecting sheet 3.2 includes an ultrasonic welding portion 4.1 connected to the negative electrode ear 2.2 and a laser welding portion 4.2 connected to the bottom surface of the negative electrode column 1.2.2.

[0026] An assembly process of a square aluminum shell battery top cover and a winding core includes the following steps:

[0027] Step 1: Place the positive electrode connecting sheet 3.1 on the fixture, place the positive electrode ears 2.1 of the two winding cores 2 above the positive electrode connecting sheet 3.1 and at the ultrasonic welding part 4.1, and fix the positive electrode ears 2.1 of the winding core 2 to the positive electrode connecting sheet 3.1 through ultrasonic welding.

[0028] Step 2: Place the negative electrode connecting sheet 3.2 on the fixture, place the negative electrode ears 2.2 of the two winding cores 2 above the negative electrode connecting sheet 3.2 and at the ultrasonic welding part 4.1, and fix the negative electrode ears 2.2 of the winding core 2 to the negative electrode connecting sheet 3.2 by ultrasonic welding; the structural diagram of the connection between the winding core 2 and the connecting sheet is shown in FIG. Figure 3 shown.

[0029] Step 3: Turn over the winding core 2 connected to the positive electrode connecting sheet 3.1 and the negative electrode connecting sheet 3.2 as a whole, so that the positive electrode connecting sheet 3.1 and the negative electrode connecting sheet 3.2 are located at the top.

[0030] Step 4: Place the bottom surface of the positive electrode column 1.2.1 in the top cover 1 on one side of the positive electrode connecting piece 3.1 on the same surface as the positive electrode ear 2.1 and located at the laser welding portion 4.2, and fix the bottom surface of the positive electrode column 1.2.1 on the positive electrode connecting piece 3.1 by laser welding.

[0031] Step 5: Place the bottom surface of the negative electrode column 1.2.2 in the top cover 1 on one side of the negative electrode connecting piece 3.2 on the same surface as the negative electrode ear 2.2 and located at the laser welding portion 4.2, and fix the bottom surface of the negative electrode column 1.2.2 on the negative electrode connecting piece 3.2 by laser welding.

[0032] During the process of step 4 and step 5, that is, when the positive electrode connecting piece 3.1 and the negative electrode connecting piece 3.2 are laser welded to the top cover 1 respectively, the winding core is at a certain angle (30 degrees) to the horizontal plane. Figure 4 As shown, the specific angle is related to the reserved length of the pole ear, the thickness of the winding core, etc., and can be adjusted accordingly, so that when the pole ear is shorter, the laser can also pass through the winding core 2 to weld the positive connecting piece 3.1 and the negative connecting piece 3.2 to the bottom surface of the pole in the top cover 1 respectively. Specifically, when the winding core is unfolded and the connecting piece is clamped, the pole ear will not be torn off and the laser can pass through to achieve welding.

[0033] Step 6: Flip the two cores 2 60 degrees along the top cover 1 and fit them together. Turn the assembled square aluminum shell battery top cover and core over as a whole to obtain a structure in which the core 2, the connecting piece 3, the pole ear, and the pole 1.2 of the top cover 1 are arranged from bottom to top. The cross-sectional view of the top cover and core assembly structure is shown in the figure. Figure 1 As shown, the exploded view of the top cover and the winding core assembly structure is shown in Figure 5.

[0034] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. An assembly structure of a square aluminum shell battery top cover and a winding core, comprising a top cover (1) and a winding core (2), wherein the top cover (1) comprises a top cover substrate (1.1) and a pole (1.2) mounted on the top cover substrate (1.1), and a lower plastic (1.3), wherein the pole (1.2) comprises a positive pole (1.2.1) and a negative pole (1.2.2), and the winding core (2) is provided with pole ears, wherein the pole ears are respectively a positive pole ear (2.1) and a negative pole ear (2.2), and wherein: The positive electrode ear (2.1) and the bottom surface of the positive electrode column (1.2.1) are respectively connected to the upper surface of the positive electrode connecting piece (3.1), and the negative electrode ear (2.2) and the bottom surface of the negative electrode column (1.2.2) are respectively connected to the upper surface of the negative electrode connecting piece (3.2).

2. The assembly structure of the square aluminum shell battery top cover and the winding core according to claim 1 is characterized in that: The pole (1.2) passes through the lower plastic (1.3), and the bottom surface of the pole (1.2) is at a distance from the bottom surface of the lower plastic (1.3); the positive electrode connecting piece (3.1) and the negative electrode connecting piece (3.2) are horizontal connecting pieces or convex connecting pieces.

3. The assembly structure of the square aluminum shell battery top cover and the winding core according to claim 2, characterized in that: The distance between the bottom surface of the pole (1.2) and the bottom surface of the lower plastic (1.3) is greater than the thickness of the pole lug, and the positive electrode connecting piece (3.1) and the negative electrode connecting piece (3.2) both comprise an ultrasonic welding portion (4.1) and a laser welding portion (4.2) formed by horizontally extending one end of the ultrasonic welding portion (4.1).

4. The assembly structure of the square aluminum shell battery top cover and the winding core according to claim 2, characterized in that: The distance between the bottom surface of the pole (1.2) and the bottom surface of the lower plastic (1.3) is not greater than the thickness of the pole lug, and the positive electrode connecting piece (3.1) and the negative electrode connecting piece (3.2) both comprise an ultrasonic welding portion (4.1) and a laser welding portion (4.2) formed by protruding from one end of the ultrasonic welding portion (4.1).

5. The assembly structure of the square aluminum shell battery top cover and the winding core according to claim 3 or 4, characterized in that: The positive electrode connecting sheet (3.1) comprises an ultrasonic welding portion (4.1) connected to the positive electrode ear (2.1) and a laser welding portion (4.2) connected to the bottom surface of the positive electrode column (1.2.1).

6. The assembly structure of the square aluminum shell battery top cover and the winding core according to claim 3 or 4, characterized in that: The negative electrode connecting sheet (3.2) comprises an ultrasonic welding portion (4.1) connected to the negative electrode ear (2.2) and a laser welding portion (4.2) connected to the bottom surface of the negative electrode column (1.2.2).

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