Top seal head of soft package battery

Abstract

The utility model relates to a top sealing head of a soft package battery, which is beneficial to improving the packaging yield of a top seal, improving the safety of the soft package battery and reducing the production cost. The top seal head of the soft package battery comprises an upper seal head and a lower seal head which are oppositely arranged, a first positive tab slot position and a first negative tab slot position are arranged on the upper sealing head, and a second positive tab slot position and a second negative tab slot position are arranged on the lower sealing head; the first positive tab slot position and the second positive tab slot position are opposite to each other and are matched with a positive tab of the soft package battery to be subjected to top sealing; the first negative tab slot position and the second negative tab slot position are opposite to each other and are matched with a negative tab of the soft package battery to be subjected to top sealing; the side wall of each tab slot is inclined towards the outer side of the slot from the slot bottom to the opening; the slot position widths of the first positive tab slot position and the second positive tab slot position are smaller than the positive tab width of the soft package battery to be subjected to top sealing; and the slot position widths of the first negative tab slot position and the second negative tab slot position are smaller than the width of the negative tab of the soft package battery to be subjected to top sealing.

Description

Technical Field

[0001] The utility model is used for a soft-pack battery, in particular to a top sealing head of a soft-pack battery. Background Art

[0002] As one of the important green chemical energy sources in the 21st century, soft-pack batteries have been widely used in many industries such as 3C consumer electronics, power vehicle batteries, and energy storage. Soft-pack batteries have the advantages of relatively flexible design, customizable appearance and size, and high energy density. In terms of safety performance, since the aluminum-plastic film shell of the soft-pack battery has a certain ductility, when a safety problem occurs, it will generally only swell and crack to deflate and release pressure, and it is not easy to explode. However, due to the thickness of the tabs, the current top seal still faces some technical difficulties: the thickness of the tabs leads to insufficient filling of the aluminum-plastic film PP glue melted by the heat of the head, resulting in problems such as through stripes on the side edges of the tabs. In "202122365436.9 Head Structure and Packaging Machine", a method for effectively preventing the overflow of glue in the overlapping area from causing overflow points of batteries with poor insulation is proposed, but the solution to the through stripes between the thickness edge of the tab side and the aluminum-plastic film PP glue is not involved. It is proposed in "202122464735.8 Head structure and packaging machine" to set upper and lower air avoidance grooves on the upper and lower heads respectively to avoid glue overflow and avoid packaging at the edge position, thereby improving the efficiency of the next process, but it still does not involve the solution to the through stripes between the thickness edge of the side of the pole ear and the PP glue of the aluminum-plastic film. Utility Model Content

[0003] The utility model provides a top sealing head for a soft-pack battery, which is beneficial to improving the top sealing packaging yield rate, improving the safety of the soft-pack battery, and reducing production costs.

[0004] To solve the above problems, the technical solution of the utility model is:

[0005] The utility model provides a top sealing head for a soft-pack battery, comprising: an upper sealing head and a lower sealing head arranged opposite to each other;

[0006] The upper end cover is provided with a first positive electrode ear slot and a first negative electrode ear slot, and the lower end cover is provided with a second positive electrode ear slot and a second negative electrode ear slot;

[0007] The first positive electrode tab slot and the second positive electrode tab slot are opposite to each other and both cooperate with the positive electrode tab of the soft-pack battery to be top-sealed;

[0008] The first negative electrode ear slot and the second negative electrode ear slot are opposite to each other and both cooperate with the negative electrode ear of the soft-pack battery to be top-sealed;

[0009] The side walls of the first positive electrode tab slot, the side walls of the first negative electrode tab slot, the side walls of the second positive electrode tab slot, and the side walls of the second negative electrode tab slot are all inclined toward the outside of the slot from the bottom of the slot to the opening;

[0010] The slot widths of the first positive electrode tab slot and the second positive electrode tab slot are smaller than the positive electrode tab width of the soft-pack battery to be top-sealed;

[0011] The slot widths of the first negative electrode tab slot and the second negative electrode tab slot are smaller than the negative electrode tab width of the soft-pack battery to be top-sealed.

[0012] Furthermore, the side wall of the first positive electrode tab slot and the side wall of the second positive electrode tab slot both include: a first inclined surface, a first vertical surface and a second inclined surface connected in sequence, the first inclined surface is connected to the bottom of the slot, and the first vertical surface is parallel to the thickness direction of the positive electrode tab of the soft-pack battery to be top-sealed.

[0013] Furthermore, the side wall of the first negative electrode ear slot and the side wall of the second negative electrode ear slot both include: a third inclined surface, a second vertical surface and a fourth inclined surface connected in sequence, the third inclined surface is connected to the bottom of the slot, and the fifth inclined surface is inclined toward the negative electrode ear of the soft-pack battery to be top-sealed.

[0014] Furthermore, the side wall of the first positive electrode ear slot and the side wall of the second positive electrode ear slot both include: a first inclined surface and a first curved surface connected to the slot bottom, the first inclined surface is connected to the bottom of the slot, and the first curved surface is recessed toward one side of the positive electrode ear of the soft-pack battery to be top-sealed.

[0015] Furthermore, the side wall of the first negative electrode ear slot and the side wall of the second negative electrode ear slot both include: a second inclined surface and a second curved surface connected to the slot bottom, the second inclined surface is connected to the bottom of the slot, and the second curved surface is concave toward one side of the negative electrode ear of the soft-pack battery to be top-sealed.

[0016] Furthermore, the slot widths of the first positive tab slot and the second positive tab slot are 0-2 mm smaller than the positive tab width of the soft-pack battery to be top-sealed.

[0017] Furthermore, the slot widths of the first negative electrode tab slot and the second negative electrode tab slot are 0-2 mm smaller than the negative electrode tab width of the soft-pack battery to be top-sealed.

[0018] Furthermore, a first glue overflow groove and a second glue overflow groove are provided on a side of the upper head facing the lower head.

[0019] Furthermore, a third glue overflow groove and a fourth glue overflow groove are provided on a side of the lower head facing the upper head;

[0020] The first glue overflow groove and the third glue overflow groove are opposite to each other;

[0021] The second glue overflow groove and the fourth glue overflow groove are opposite to each other.

[0022] Furthermore, the lengths of the side walls of the first positive tab slot, the side walls of the first negative tab slot, the side walls of the second positive tab slot, and the side walls of the second negative tab slot are 3 mm to 4 mm, and the depths of the side walls of the first positive tab slot, the side walls of the first negative tab slot, the side walls of the second positive tab slot, and the second negative tab slot are 0.5 mm to 0.7 mm.

[0023] The beneficial effects of the utility model are:

[0024] The slot of the top seal head and the pole ear is made into an inclined surface and / or an arc surface that matches the edge of the pole ear metal strip; during the top seal packaging, due to the inclined surface and / or arc surface of the slot of the top seal head and the pole ear, the probability of the top seal packaging being misaligned or the head pressing the pole ear can be reduced, and the thickness consistency of the top seal packaging pole ear position can be improved. At the same time, during the top seal packaging process, after the aluminum-plastic film and the pole ear are hot-pressed by the head, the aluminum-plastic film PP glue at the inclined surface of the slot of the top seal head and the pole ear is filled in the direction of the pole ear metal strip by extrusion and casting, ensuring that there is no penetration and unmelted situation between the pole ear metal strip and the aluminum-plastic film, improving the product yield, reducing production costs, while ensuring good sealing of the soft-pack battery and improving the safety of the soft-pack battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the top sealing head of the soft pack battery in the utility model;

[0026] Figure 2 It is a schematic diagram of the top sealing head of the soft-pack battery in the utility model;

[0027] Figure 3 This is a schematic cross-sectional diagram of the top seal of the soft-pack battery in Example 1;

[0028] Figure 4 This is a schematic cross-sectional diagram of the top seal of the soft-pack battery in Example 2;

[0029] Figure 5 This is a schematic cross-sectional diagram of the top seal of the soft-pack battery in Example 3;

[0030] Figure 6 A schematic diagram showing a cross-sectional comparison of the top seal of a soft-pack battery in the prior art;

[0031] Reference numerals: 1-positive electrode ear, 2-negative electrode ear, 3-bare battery cell after welding, 4-aluminum-plastic film, 5-upper head, 6-lower head;

[0032] 61 - second positive electrode ear slot, 62 - second negative electrode ear slot, 63 - third glue overflow slot, 64 - fourth glue overflow slot;

[0033] 511 - first side wall, 512 - second side wall;

[0034] 611 - third side wall, 612 - fourth side wall;

[0035] 621-seventh side wall, 622-eighth side wall;

[0036] 5111- inclined plane 1; 5112- vertical plane 1; 5113- inclined plane 2; 5114- arc plane 1;

[0037] 6111- inclined plane three; 6112- vertical plane two; 6113- inclined plane four; 6114- arc surface two. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0039] Combination Figure 1 to Figure 2 The utility model provides a top seal head for a soft-pack battery. The soft-pack battery involved comprises a tab, a bare battery cell 3 after the tabs are welded, and an aluminum-plastic film 4, wherein the tabs comprise a positive tab 1 and a negative tab 2, wherein the aluminum-plastic film 4 is a punched aluminum-plastic film 4, and the depth of the punched aluminum-plastic film 4 corresponds to the thickness of the bare battery cell 3 after welding. The top seal packaging of the soft-pack battery is achieved by the top seal head through hot pressing the aluminum-plastic film 4 and the tabs.

[0040] For the positive electrode ear 1 and the negative electrode ear 2 in the present invention, both include: a metal strip and a metal strip inclined surface. Figures 3 to 5 The positive electrode ear 1 in the embodiment includes: a positive electrode ear metal strip and a positive electrode ear metal strip inclined surface, and the positive electrode ear metal strip inclined surfaces are arranged at both ends of the positive electrode ear metal strip. The length of the positive electrode ear metal strip inclined surface is 0.3mm-0.7mm, the thickness of the positive electrode ear metal strip is 0.3mm-0.5mm, and the total thickness of the positive electrode ear metal strip and the electrode ear glue is 0.5mm-0.7mm. Similarly, for the negative electrode ear 2, the thickness of the negative electrode ear metal strip, the length of the negative electrode ear metal strip inclined surface, and the total thickness of the negative electrode ear metal strip and the electrode ear glue are all consistent with the positive electrode ear 1.

[0041] In the present invention, the material of the top seal of the soft pack battery is a brass material with heat transfer. Figure 1 and Figure 2The top sealing head of the soft-pack battery includes an upper sealing head 5 and a lower sealing head 6, and the lower sealing head 6 is arranged corresponding to the upper sealing head 5. The upper sealing head 5 is provided with a first positive electrode ear slot, a first negative electrode ear slot, a first glue overflow slot, a second glue overflow slot and a screw fixing slot, and the lower sealing head 6 is provided with a second positive electrode ear slot 61, a second negative electrode ear slot 62, a third glue overflow slot 63, a fourth glue overflow slot 64 and a screw fixing slot.

[0042] Among them, combined Figure 1 and Figure 2 From the perspective of FIG. 1 , the first positive electrode ear slot and the second positive electrode ear slot 61 are opposite to each other, the first negative electrode ear slot and the second negative electrode ear slot 62 are opposite to each other, the first glue overflow groove and the third glue overflow groove 63 are opposite to each other, and the second glue overflow groove and the fourth glue overflow groove 64 are opposite to each other.

[0043] In the present invention, the side walls of the first positive electrode ear slot, the side walls of the first negative electrode ear slot, the side walls of the second positive electrode ear slot 61, and the side walls of the second negative electrode ear slot 62 are all inclined toward the outside of the slot from the bottom of the slot to the opening. In addition, the slot width of the first positive electrode ear slot and the second positive electrode ear slot 61 is smaller than the width of the positive electrode ear 1 of the soft-pack battery to be top-sealed, and the slot width of the first negative electrode ear slot and the second negative electrode ear slot 62 is smaller than the width of the negative electrode ear 2 of the soft-pack battery to be top-sealed.

[0044] like Figure 3 The first positive electrode ear slot has a first side wall 511 and a second side wall 512, and the first side wall 511 and the second side wall 512 are symmetrical with respect to the plane center of the first positive electrode ear slot. The slot width of the first positive electrode ear slot is less than the width of the positive electrode ear 1, and the value does not exceed 2mm. The length of the first side wall 511 and the second side wall 512 is 3mm to 4mm, and the height of the first side wall 511 and the second side wall 512 is 1 / 2 of the thickness of the positive electrode ear corresponding to the first positive electrode ear slot.

[0045] like Figure 1 , Figures 3 to 5 The second positive electrode ear slot 61 has a third side wall 611 and a fourth side wall 612, and the third side wall 611 and the fourth side wall 612 are symmetrical with respect to the plane center of the second positive electrode ear slot 61. The slot width of the second positive electrode ear slot 61 is less than the width of the positive electrode ear 1, and the value does not exceed 2mm; the length of the third side wall 611 and the fourth side wall 612 is 3mm to 4mm, and the height of the third side wall 611 and the fourth side wall 612 is 1 / 2 of the thickness of the positive electrode ear corresponding to the second positive electrode ear slot 61.

[0046] Similarly, if Figure 1 The first negative electrode tab slot has a fifth side wall and a sixth side wall, and the second negative electrode tab slot 62 has a seventh side wall 621 and an eighth side wall 622. The specific arrangement of the fifth to eighth side walls 622 refers to the arrangement of the side walls of the first positive electrode tab slot and the second positive electrode tab slot 61.

[0047] In the present invention, the slot width of the first negative electrode tab slot is 0-2 mm smaller than the negative electrode tab width of the soft-pack battery to be top-sealed.

[0048] In the present invention, a plurality of setting methods are provided for the side wall of the first positive electrode tab slot, the side wall of the first negative electrode tab slot, the side wall of the second positive electrode tab slot 61 and the side wall of the second negative electrode tab slot 62. The setting methods of the side walls of the four electrode tab slots are consistent. In this embodiment, the side walls of the first positive electrode tab slot and the second positive electrode tab slot 61 are taken as examples for description.

[0049] In a first implementation, the side walls of the first positive electrode tab slot, the second positive electrode tab slot 61, the first negative electrode tab slot, and the second negative electrode tab slot 62 are designed as a complete inclined surface. Figure 3 In the figure, the first side wall 511 and the second side wall 512 of the first positive electrode tab slot are both inclined surfaces. Similarly, the third side wall 611 and the fourth side wall 612 of the second positive electrode tab slot 61 are also inclined surfaces.

[0050] In the second implementation, the first positive electrode tab slot and the second positive electrode tab slot 61 both include a first inclined surface, a first vertical surface and a second inclined surface connected to each other. The first negative electrode tab slot and the second negative electrode tab slot 62 both include a third inclined surface, a second vertical surface and a fourth inclined surface connected to each other.

[0051] For example, in Figure 4 In the figure, the first side wall 511 and the second side wall 512 of the first positive electrode ear slot are composed of a slope 1 5111, a vertical surface 1 5112 and a slope 2 5113 connected in sequence, and the vertical surface 1 5112 is parallel to the thickness direction of the positive electrode ear 1 of the soft-pack battery to be top-sealed. The lengths of the slope 1 5111 and the slope 2 5113 are the same, which is 1.5 mm to 2.0 mm; the height of the vertical surface 1 5112 is 1 / 6 of the thickness of the positive electrode ear 1 corresponding to the first positive electrode ear slot. The inclined surface 1 5111, the vertical surface 1 5112 and the inclined surface 2 5113 can fully heat the PP glue of the aluminum-plastic film 4; at the same time, the step design of the inclined surface 1 5111, the inclined surface 2 5113 and the vertical surface 1 5112 forms a height difference, which can squeeze the PP glue of the aluminum-plastic film 4, so that when the upper head 5 deviates, the PP glue of the aluminum-plastic film 4 that has been melted on the side away from the step can be cast backfilled in the direction close to the positive ear.

[0052] Similarly, refer to Figure 4The third side wall 611 and the fourth side wall 612 of the second positive electrode ear slot 61 are both composed of the three inclined planes 6111, the two vertical planes 6112 and the four inclined planes 6113 connected in sequence, and the two vertical planes 6112 are parallel to the thickness direction of the positive electrode ear 1 of the soft-pack battery to be top-sealed. The lengths of the three inclined planes 6111 and the four inclined planes 6113 are equal, which are 1.5mm to 2.0mm; the height of the two vertical planes 6112 is 1 / 6 of the thickness of the positive electrode ear 1 corresponding to the first positive electrode ear slot.

[0053] In a third implementation, the first positive electrode tab slot and the second positive electrode tab slot 61 both include a first inclined surface and a first curved surface connected to each other; the first negative electrode tab slot and the second negative electrode tab slot 62 both include a second inclined surface and a second curved surface connected to each other.

[0054] For example, in Figure 5 In the embodiment, the first side wall 511 and the second side wall 512 of the first positive electrode ear slot are both composed of a connected inclined surface 5111 and a curved surface 5114. The inclined surface 5111 is connected to the bottom of the first positive electrode ear slot, and the curved surface 5114 is recessed toward the positive electrode ear 1 of the soft-pack battery to be sealed. The length of the inclined surface 5111 is 1.5 mm to 2.0 mm, and the radius of the curved surface 5114 is 0.8 mm to 1.2 mm. The inclined surface 5111 and the curved surface 5114 can fully heat the PP glue of the aluminum-plastic film 4; at the same time, the height difference formed by the step design between the inclined surface 5111 and the curved surface 5114 is used to squeeze the PP glue of the aluminum-plastic film 4, so that the PP glue of the aluminum-plastic film 4 that has melted on the side away from the step when the upper head 5 is offset is cast backfilled toward the positive electrode ear.

[0055] Similarly, in Figure 5 In the figure, the third side wall 611 and the fourth side wall 612 of the second positive electrode ear slot 61 are both composed of a connected inclined surface 5113 and a second curved surface 6114, the second inclined surface 5113 is connected to the bottom of the second positive electrode ear slot 61, and the second curved surface 6114 is recessed toward the side of the positive electrode ear 1 of the soft-pack battery to be top-sealed, the length of the second inclined surface 5113 is 1.5 mm to 2.0 mm, and the radius of the second curved surface 6114 is 0.8 mm to 1.2 mm.

[0056] Based on the above summary, three specific embodiments of the above-mentioned soft-pack battery top seal head are provided in this embodiment.

[0057] Example 1

[0058] like Figure 3 The top sealing head of the soft-pack battery in this embodiment 1 is composed of an upper sealing head 5 and a lower sealing head 6.

[0059] The upper end cover 5 is provided with a first positive electrode tab slot and a second negative electrode tab slot 62 , and the lower end cover 6 is provided with a second positive electrode tab slot 61 and a second negative electrode tab slot 62 .

[0060] The side walls of the first positive electrode tab slot, the side walls of the first negative electrode tab slot, the side walls of the second positive electrode tab slot 61 and the side walls of the second negative electrode tab slot 62 are all inclined toward the outside of the slot from the bottom to the opening.

[0061] The slot widths of the first positive tab slot and the second positive tab slot 61 are smaller than the positive tab width of the soft-pack battery to be top-sealed; the slot widths of the first negative tab slot and the second negative tab slot 62 are smaller than the negative tab width of the soft-pack battery to be top-sealed.

[0062] The widths of the first positive electrode tab slot, the second negative electrode tab slot 62, the second positive electrode tab slot 61, and the second negative electrode tab slot 62 are smaller than the widths of the corresponding electrode tab metal strips, and the width value is ≤2 mm.

[0063] The inclined length of the metal strip of the positive electrode ear 1 and the negative electrode ear 2 is 0.3mm-0.7mm, the thickness of the metal strip of the positive electrode ear 1 and the negative electrode ear 2 is 0.3mm-0.5mm, and the total thickness of the metal strip of the positive electrode ear 1 and the negative electrode ear 2 and the electrode ear glue is 0.5mm-0.7mm.

[0064] In Example 1, the side wall of the first positive electrode ear slot, the side wall of the first negative electrode ear slot, the side wall of the second positive electrode ear slot 61 and the side wall of the second negative electrode ear slot 62 are all inclined surfaces, and the side wall of the first positive electrode ear slot, the side wall of the first negative electrode ear slot, the side wall of the second positive electrode ear slot 61 and the side wall of the second negative electrode ear slot 62 are 3mm to 4mm in length, and the depth of each electrode ear slot is 0.5mm to 0.7mm. The cross-sectional view of the packaging effect is as shown in FIG. Figure 3 As shown, the gap between the pole ear and the head is an aluminum-plastic film 4.

[0065] Since the slot width of each tab slot is smaller than the corresponding tab width of the soft-pack battery to be sealed, the PP glue (PP glue is the full name of polypropylene glue, which is an adhesive specially used for bonding polypropylene (PP) materials) of the aluminum-plastic film 4 can be heated by adjusting the sealing pressure and temperature without extending the tab slot of the head, ensuring that the PP glue in the thickness direction of the tab can be fully melted and cast to avoid Figure 6 In the comparative example, when the upper head is misaligned, the pressing ear causes the PP glue to be unable to fully melt and fill, resulting in a through-type gap, which reduces the risk of leakage and the cost loss caused by leakage.

[0066] Example 2

[0067] like Figure 4 The top sealing head of the soft-pack battery in this embodiment 2 is composed of an upper sealing head 5 and a lower sealing head 6.

[0068] The upper sealing head 5 of the top sealing package of the soft-pack battery is provided with a first positive electrode ear slot and a second negative electrode ear slot 62 , and the lower sealing head 6 is provided with a second positive electrode ear slot 61 and a second negative electrode ear slot 62 .

[0069] The side walls of the first positive electrode tab slot, the side walls of the first negative electrode tab slot, the side walls of the second positive electrode tab slot 61 and the side walls of the second negative electrode tab slot 62 are all inclined toward the outside of the slot from the bottom to the opening.

[0070] The slot widths of the first positive tab slot and the second positive tab slot 61 are smaller than the width of the positive tab 1 of the soft-pack battery to be top-sealed; the slot widths of the first negative tab slot and the second negative tab slot 62 are smaller than the width of the negative tab 2 of the soft-pack battery to be top-sealed.

[0071] The widths of the first positive electrode tab slot, the second negative electrode tab slot 62, the second positive electrode tab slot 61, and the second negative electrode tab slot 62 are smaller than the widths of the corresponding electrode tab metal strips, and the width value is ≤2 mm.

[0072] The side wall of the first positive electrode tab slot and the side wall of the second positive electrode tab slot 61 both include: a first inclined surface, a first vertical surface and a second inclined surface connected in sequence, the first inclined surface connects the bottom of the slot, and the first vertical surface is parallel to the thickness direction of the positive electrode tab 1 of the soft-pack battery to be top-sealed. The length of the first inclined surface and the second inclined surface is 1.5mm to 2mm, and the depth of the tab slot is 0.5mm to 0.7mm.

[0073] The side wall of the first negative electrode ear slot and the side wall of the second negative electrode ear slot 62 both include: a third inclined surface, a second vertical surface and a fourth inclined surface connected in sequence, the third inclined surface connects to the bottom of the slot, and the second vertical surface is parallel to the thickness direction of the negative electrode ear 2 of the soft-pack battery to be sealed. The length of the third inclined surface and the fourth inclined surface is 1.5mm to 2mm, the depth of the ear slot is 0.5mm to 0.7mm, and the cross-sectional view of the packaging effect is as shown in FIG. Figure 4 As shown, the gap between the pole ear and the head is an aluminum-plastic film 4.

[0074] The inclined length of the metal strip of the positive electrode ear 1 and the negative electrode ear 2 is 0.3mm-0.7mm, the thickness of the metal strip of the positive electrode ear 1 and the negative electrode ear 2 is 0.3mm-0.5mm, and the total thickness of the metal strip of the positive electrode ear 1 and the negative electrode ear 2 and the electrode ear glue is 0.5mm-0.7mm.

[0075] In the second embodiment, since the slot width of each tab slot is smaller than the corresponding tab width of the soft-pack battery to be top-sealed, it is possible to form a slope step between the first inclined surface and the second inclined surface through the first vertical surface without extending the tab slot of the head (similarly, the second vertical surface forms a slope step between the third inclined surface and the fourth inclined surface). The height difference formed by the design of the slope step is used to squeeze the PP glue of the aluminum-plastic film 4, and the PP glue of the aluminum-plastic film 4 can still be fully heated when the head is offset, ensuring that there is sufficient PP glue casting backfill in the thickness direction of the tab, avoiding the through-type gap caused by insufficient PP glue casting backfill due to extending the tab slot of the head, and reducing the risk of leakage.

[0076] Example 3

[0077] like Figure 5 The top sealing head of the soft-pack battery in this embodiment 3 is composed of an upper sealing head 5 and a lower sealing head 6.

[0078] The upper sealing head 5 of the top sealing package of the soft-pack battery is provided with a first positive electrode ear slot and a second negative electrode ear slot 62 , and the lower sealing head 6 is provided with a second positive electrode ear slot 61 and a second negative electrode ear slot 62 .

[0079] The side walls of the first positive electrode tab slot, the side walls of the first negative electrode tab slot, the side walls of the second positive electrode tab slot 61 and the side walls of the second negative electrode tab slot 62 are all inclined toward the outside of the slot from the bottom to the opening.

[0080] The slot widths of the first positive tab slot and the second positive tab slot 61 are smaller than the width of the positive tab 1 of the soft-pack battery to be top-sealed; the slot widths of the first negative tab slot and the second negative tab slot 62 are smaller than the width of the negative tab 2 of the soft-pack battery to be top-sealed.

[0081] The widths of the first positive electrode tab slot, the second negative electrode tab slot 62, the second positive electrode tab slot 61, and the second negative electrode tab slot 62 are smaller than the widths of the corresponding electrode tab metal strips, and the width value is ≤2 mm.

[0082] The side wall of the first positive electrode ear slot and the side wall of the second positive electrode ear slot 61 both include: a first inclined surface and a first curved surface connected to each other, the first inclined surface connects to the bottom of the slot, and the first curved surface is concave toward the positive electrode ear 1 of the soft-pack battery to be sealed. The length of the first inclined surface is 1.5mm to 2mm, the depth of the ear slot is 0.5mm to 0.7mm, and the radius of the first curved surface is 1.0mm to 1.5mm. The cross-sectional view of the packaging effect is as shown in FIG. Figure 5 As shown, the gap between the pole ear and the head is an aluminum-plastic film 4.

[0083] The side wall of the first negative electrode ear slot and the side wall of the second negative electrode ear slot 62 both include: a second inclined surface and a second curved surface connected to the bottom of the slot, and the second curved surface is concave toward the negative electrode ear 2 of the soft-pack battery to be sealed. The length of the second inclined surface is 1.5mm to 2mm, the depth of the ear slot is 0.5mm to 0.7mm, and the radius of the second curved surface is 1.0mm to 1.5mm. The cross-sectional view of the packaging effect is as shown in FIG. Figure 5 As shown, the gap between the pole ear and the head is an aluminum-plastic film 4.

[0084] In this embodiment 3, since the slot width of each tab slot is smaller than the corresponding tab width of the soft-pack battery to be top-sealed, it is possible to form a design of an inclined surface + an arc surface between the first arc surface and the first inclined surface (similarly, a design of an inclined surface + an arc surface is also formed between the second arc surface and the second inclined surface) without extending the tab slot of the head. The PP glue of the aluminum-plastic film 4 is squeezed by the height difference formed by the design of the inclined surface + the arc surface, and the PP glue of the aluminum-plastic film 4 can still be fully heated when the head package is offset, ensuring that there is sufficient PP glue casting backfill in the thickness direction of the tab, avoiding the through-type gap caused by insufficient PP glue casting backfill due to extending the tab slot of the head, and reducing the risk of leakage.

[0085] Utilizing the soft-pack battery top-sealing head in the above-mentioned multiple embodiments, the present embodiment further provides a soft-pack battery top-sealing packaging method, comprising the following steps: (a), placing the bare battery cell 3 after the pole tabs are welded flatly into the aluminum-plastic film 4 in which the holes have been punched; (b), folding the aluminum-plastic film 4 in half to completely wrap the bare battery cell 3 after welding, and determining the alignment of the folded aluminum-plastic film 4 by the overlap of the positioning holes; (c), placing the corresponding positive and negative pole tabs 2 of the entire soft-pack battery to be top-sealed into the pole tab slots of the top-sealing head, and adjusting the fit between the positive and negative pole tabs and the pole tab slots; (d), using equipment to perform top-sealing packaging of the soft-pack battery; and (e), taking out the top-sealed lithium-ion battery and transferring it to the side packaging process.

[0086] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0087] Although the preferred embodiments of the utility model embodiments have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the utility model embodiments.

[0088] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, relational terms such as "first" and "second" are used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements does not include those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0089] The technical solution provided by the utility model is described in detail above. The principle and implementation method of the utility model are described in this article using specific examples. The description of the above embodiments is only used to help understand the utility model, and the content of this specification should not be understood as limiting the utility model. At the same time, for those skilled in the art, according to the utility model, there will be different forms of changes in the specific implementation methods and application scopes. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived from them are still within the protection scope of the utility model.

Claims

1. A top seal for a soft pack battery, characterized in that: include: An upper head and a lower head are arranged opposite to each other; The upper end cover is provided with a first positive electrode ear slot and a first negative electrode ear slot, and the lower end cover is provided with a second positive electrode ear slot and a second negative electrode ear slot; The first positive electrode tab slot and the second positive electrode tab slot are opposite to each other and both cooperate with the positive electrode tab of the soft-pack battery to be top-sealed; The first negative electrode ear slot and the second negative electrode ear slot are opposite to each other and both cooperate with the negative electrode ear of the soft-pack battery to be top-sealed; The side walls of the first positive electrode tab slot, the side walls of the first negative electrode tab slot, the side walls of the second positive electrode tab slot, and the side walls of the second negative electrode tab slot are all inclined toward the outside of the slot from the bottom of the slot to the opening; The slot widths of the first positive electrode tab slot and the second positive electrode tab slot are smaller than the positive electrode tab width of the soft-pack battery to be top-sealed; The slot widths of the first negative electrode tab slot and the second negative electrode tab slot are smaller than the negative electrode tab width of the soft-pack battery to be top-sealed.

2. The top seal of the soft pack battery according to claim 1, characterized in that: The side wall of the first positive electrode tab slot and the side wall of the second positive electrode tab slot both include: a first inclined surface, a first vertical surface and a second inclined surface connected in sequence, the first inclined surface is connected to the bottom of the slot, and the first vertical surface is parallel to the thickness direction of the positive electrode tab of the soft-pack battery to be top-sealed.

3. The top seal of the soft pack battery according to claim 1 or 2, characterized in that: The side wall of the first negative electrode ear slot and the side wall of the second negative electrode ear slot both include: a third inclined surface, a second vertical surface and a fourth inclined surface connected in sequence, the third inclined surface is connected to the bottom of the slot, and the second vertical surface is parallel to the thickness direction of the negative electrode ear of the soft-pack battery to be top-sealed.

4. The top seal of the soft pack battery according to claim 1, characterized in that: The side wall of the first positive electrode tab slot and the side wall of the second positive electrode tab slot both include: a first inclined surface and a first curved surface connected to the slot bottom, the first inclined surface is connected to the bottom of the slot, and the first curved surface is concave toward one side of the positive electrode tab of the soft-pack battery to be top-sealed.

5. The top seal of the soft pack battery according to claim 1 or 4, characterized in that: The side wall of the first negative electrode ear slot and the side wall of the second negative electrode ear slot both include: a second inclined surface and a second curved surface connected to the slot bottom, the second inclined surface is connected to the bottom of the slot, and the second curved surface is concave toward one side of the negative electrode ear of the soft-pack battery to be top-sealed.

6. The top seal of the soft pack battery according to claim 1, characterized in that: The slot widths of the first positive electrode tab slot and the second positive electrode tab slot are 0-2 mm smaller than the positive electrode tab width of the soft-pack battery to be top-sealed.

7. The top seal of the soft pack battery according to claim 1, characterized in that: The slot widths of the first negative electrode tab slot and the second negative electrode tab slot are 0-2 mm smaller than the negative electrode tab width of the soft-pack battery to be top-sealed.

8. The top seal of the soft pack battery according to claim 1, characterized in that: A first glue overflow groove and a second glue overflow groove are provided on a side of the upper head facing the lower head.

9. The top seal of the soft pack battery according to claim 8, characterized in that: A third glue overflow groove and a fourth glue overflow groove are provided on one side of the lower head facing the upper head; The first glue overflow groove and the third glue overflow groove are opposite to each other; The second glue overflow groove and the fourth glue overflow groove are opposite to each other.

10. The top seal of the soft pack battery according to claim 1, characterized in that: The lengths of the side walls of the first positive electrode tab slot, the side walls of the first negative electrode tab slot, the side walls of the second positive electrode tab slot, and the side walls of the second negative electrode tab slot are 3 mm to 4 mm, and the depths of the side walls of the first positive electrode tab slot, the side walls of the first negative electrode tab slot, the side walls of the second positive electrode tab slot, and the second negative electrode tab slot are 0.5 mm to 0.7 mm.

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