Full-tab square aluminum shell battery

Abstract

The utility model relates to a full-tab square aluminum shell battery which comprises a shell, a battery cell, a top cover, an anode heat-conducting insulating sheet and a cathode heat-conducting insulating sheet, the battery cell is arranged in the shell and is provided with a positive pole lug and a negative pole lug; the top cover is connected to the positive pole lug and the negative pole lug; one side of the positive electrode heat-conducting insulating sheet is propped against the positive electrode lug, and the other side of the positive electrode heat-conducting insulating sheet is propped against the shell; one side of the negative electrode heat-conducting insulating sheet is propped against the negative electrode lug, and the other side of the negative electrode heat-conducting insulating sheet is propped against the shell. According to the utility model, heat generated in the battery cell can be quickly conducted out to the shell through the positive electrode heat-conducting insulating sheet and the negative electrode heat-conducting insulating sheet for heat dissipation, so that the condition that the battery is overheated is avoided.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a square aluminum-cased battery with full tabs. Background Technology

[0002] With the increasing efficiency of modern technology, fast charging of lithium batteries is becoming a development trend, especially in the field of power batteries. Fast charging places extremely high demands on the battery's overcurrent and heat dissipation performance. Square aluminum-cased batteries account for a large proportion of the market, but currently, many square aluminum-cased lithium batteries use multiple tabs welded to the top cover for current conduction. The small tab area easily creates a current conduction bottleneck during charging, preventing fast charging from proceeding. Furthermore, the charging current is extremely high during fast charging, and there is no thermally conductive interface material between the highest temperature connecting tabs and the aluminum casing; the air is the only thermal interface, resulting in high thermal resistance. This prevents timely dissipation of Joule heat, which can lead to electrolyte decomposition, decreased conductivity, and a sharp decline in battery performance. In severe cases, it can cause thermal runaway, resulting in fires, explosions, and other safety accidents. Utility Model Content

[0003] Based on this, it is necessary to address the problem of poor heat dissipation performance of existing lithium batteries. This utility model provides a square aluminum-cased battery with all tabs, including a casing, a cell, a top cover, a positive electrode thermally conductive insulating sheet, and a negative electrode thermally conductive insulating sheet. The cell is disposed inside the casing and has a positive electrode tab and a negative electrode tab. The top cover is connected to the positive electrode tab and the negative electrode tab. One side of the positive electrode thermally conductive insulating sheet abuts against the positive electrode tab, and the other side of the positive electrode thermally conductive insulating sheet abuts against the casing. One side of the negative electrode thermally conductive insulating sheet abuts against the negative electrode tab, and the other side of the negative electrode thermally conductive insulating sheet abuts against the casing.

[0004] By adopting the above technical solution, when lithium batteries are in use, due to the large current of fast charging, a large amount of Joule heat will be generated. Joule heat can be promptly transferred to the outer casing through the positive and negative thermally conductive insulating sheets. The outer casing then accelerates convection heat dissipation with the cold air in the outside air, thus promptly transferring the heat inside the battery cell to the outside and avoiding thermal runaway.

[0005] Preferably, the top cover includes a top cover plate, a positive terminal post, and a negative terminal post. The top cover plate has a positive terminal mounting hole and a negative terminal mounting hole. The positive terminal post passes through the positive terminal mounting hole and is connected to the top cover plate. The negative terminal post passes through the negative terminal mounting hole and is connected to the top cover plate.

[0006] Preferably, the positive electrode tab includes a positive electrode assembly piece and a positive electrode adapter piece, the positive electrode assembly piece and the positive electrode adapter piece being connected to form an L-shaped structure, and the negative electrode tab includes a negative electrode assembly piece and a negative electrode adapter piece, the negative electrode assembly piece and the negative electrode adapter piece being connected to form an L-shaped structure.

[0007] Preferably, the device further includes a first insulating sheet and a second insulating sheet, wherein the first insulating sheet is disposed between the positive electrode assembly sheet and the battery cell, and the second insulating sheet is disposed between the negative electrode assembly sheet and the battery cell.

[0008] By adopting the above technical solution, the first insulating sheet can isolate the insulating positive electrode assembly piece from the battery cell to avoid conduction between the positive electrode assembly piece and the battery cell, and the second insulating sheet can isolate the insulating negative electrode assembly piece from the battery cell to avoid conduction between the negative electrode assembly piece and the battery cell.

[0009] Preferably, the positive electrode adapter piece is provided with a first groove, and the negative electrode adapter piece is provided with a second groove.

[0010] Preferably, the positive electrode adapter piece is provided with a plurality of waist-shaped holes, and the negative electrode adapter piece is provided with a plurality of waist-shaped holes.

[0011] By adopting the above technical solution, when welding the positive electrode adapter and the negative electrode adapter, the oblong hole can provide space for the material heated during welding to expand, so as to avoid large thermal deformation of the structure.

[0012] Preferably, it further includes a double-sided adhesive layer, the double-sided adhesive layer connecting the positive electrode thermally conductive insulating sheet and the positive electrode adapter sheet, and the double-sided adhesive layer connecting the negative electrode thermally conductive insulating sheet and the negative electrode adapter sheet.

[0013] By adopting the above technical solution, the double-sided adhesive layer can effectively fix the positive thermally conductive insulating sheet and the positive electrode adapter sheet, as well as the negative thermally conductive insulating sheet and the negative electrode adapter sheet.

[0014] Preferably, the battery cell includes a winding assembly and a protective film layer wrapped around the winding assembly.

[0015] Preferably, the outer shell is square.

[0016] Preferably, the outer casing is made of aluminum. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a square aluminum-cased battery with full tabs provided in an embodiment of the present invention;

[0018] In the diagram, 100 is the top cover; 110 is the top cover piece; 120 is the positive terminal post; 130 is the negative terminal post; 121 is the positive terminal shaft end; 131 is the negative terminal shaft end; 210 is the negative terminal tab; 220 is the positive terminal tab; 211 is the negative terminal mounting hole; 213 is the negative terminal assembly piece; 214 is the negative terminal adapter piece; 221 is the positive terminal mounting hole; 222 is the first groove; 223 is the positive terminal assembly piece; 224 is the positive terminal adapter piece; 225 is the waist-shaped hole; 300 is the first insulating sheet; 310 is the second insulating sheet; 40 is the battery cell; 410 is the negative terminal thermally conductive insulating sheet; 411 is the double-sided adhesive layer; 420 is the positive terminal thermally conductive insulating sheet; 50 is the top cover assembly; 500 is the winding assembly; 510 is the flattening area; 600 is the protective film layer; 700 is the outer shell; 710 is the inner wall of the outer shell. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that when an element is referred to as being “fixed on” or “set on” another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0021] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0023] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the content disclosed herein. They are not intended to limit the implementation conditions of this application and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effectiveness and purpose of this application, should still fall within the scope of the technical content disclosed herein. Furthermore, the term "and / or" as used in this specification includes any and all combinations of the related listed items.

[0024] like Figure 1 As shown, this utility model provides a square aluminum-cased battery with multiple tabs, including a casing 700, a battery cell 40, a top cover 100, a positive electrode thermally conductive insulating sheet 420, and a negative electrode thermally conductive insulating sheet 410. The battery cell 40 is disposed inside the casing 700 and has a positive electrode tab 220 and a negative electrode tab 210. The top cover 100 is connected to the positive electrode tab 220 and the negative electrode tab 210. One side of the positive electrode thermally conductive insulating sheet 420 abuts against the positive electrode tab 220, and the other side of the positive electrode thermally conductive insulating sheet 420 abuts against the casing 700. One side of the negative electrode thermally conductive insulating sheet 410 abuts against the negative electrode tab 210, and the other side of the negative electrode thermally conductive insulating sheet 410 abuts against the casing 700.

[0025] By adopting the above technical solution, when the lithium battery is in use, due to the large current of fast charging, a large amount of Joule heat will be generated. The Joule heat can be promptly directed to the outer casing 700 through the positive electrode thermally conductive insulating sheet 420 and the negative electrode thermally conductive insulating sheet 410. The outer casing 700 then accelerates the convection heat dissipation with the cold air in the outside air, thus promptly directing the heat inside the cell 40 to the outside and avoiding thermal runaway.

[0026] In one embodiment, the top cover 100 includes a top cover plate 110, a positive electrode post 120, and a negative electrode post 130. The top cover plate 110 has a positive electrode mounting hole 221 and a negative electrode mounting hole 211. The positive electrode post 120 passes through the positive electrode mounting hole 221 and is connected to the top cover plate 110, and the negative electrode post 130 passes through the negative electrode mounting hole 211 and is connected to the top cover plate 110. Specifically, the positive electrode shaft end 121 of the positive electrode post 120 passes through the positive electrode mounting hole 221, and the positive electrode post 120 and the top cover plate 110 are fixedly connected by gap laser welding. The negative electrode shaft end 131 of the negative electrode post 130 passes through the negative electrode mounting hole 211, and the negative electrode post 130 and the top cover plate 110 are fixedly connected by gap laser welding.

[0027] In one embodiment, the positive electrode tab 220 includes a positive electrode assembly piece 223 and a positive electrode adapter piece 224, with the positive electrode assembly piece 223 and the positive electrode adapter piece 224 connected to form an L-shaped structure. The negative electrode tab 210 includes a negative electrode assembly piece 213 and a negative electrode adapter piece 214, with the negative electrode assembly piece 213 and the negative electrode adapter piece 214 connected to form an L-shaped structure.

[0028] In one embodiment, the system further includes a first insulating sheet 300 and a second insulating sheet 310. The first insulating sheet 300 is disposed between the positive electrode assembly piece 223 and the battery cell 40, and the second insulating sheet 310 is disposed between the negative electrode assembly piece 213 and the battery cell 40. Specifically, the first insulating sheet 300 is adhered to the welding area of ​​the positive electrode assembly piece 223 using acrylic adhesive, and the second insulating sheet 310 is adhered to the welding area of ​​the negative electrode assembly piece 213 using acrylic adhesive.

[0029] By adopting the above technical solution, the first insulating sheet 300 can isolate the insulating positive electrode assembly sheet 223 from the battery cell 40 to avoid the positive electrode assembly sheet 223 from conducting with the battery cell 40, and the second insulating sheet 310 can isolate the insulating negative electrode assembly sheet 213 from the battery cell 40 to avoid the negative electrode assembly sheet 213 from conducting with the battery cell 40.

[0030] In one embodiment, the positive electrode adapter 224 has a first groove 222, and the negative electrode adapter 214 has a second groove. The first groove 222 and the second groove are used for welding operations.

[0031] In one embodiment, the positive electrode adapter 224 is provided with a plurality of waist-shaped holes 225, and the negative electrode adapter 214 is provided with a plurality of waist-shaped holes.

[0032] By adopting the above technical solution, when welding the positive electrode adapter 224 and the negative electrode adapter 214, the oblong hole 225 can provide space for the material heated during welding to expand, so as to avoid large thermal deformation of the structure.

[0033] In one embodiment, a double-sided adhesive layer 411 is also included, which connects the positive thermally conductive insulating sheet 420 and the positive adapter sheet 224, and connects the negative thermally conductive insulating sheet 410 and the negative adapter sheet 214.

[0034] By adopting the above technical solution, the double-sided adhesive layer 411 can effectively fix the positive electrode thermally conductive insulating sheet 420 and the positive electrode adapter sheet 224, as well as the negative electrode thermally conductive insulating sheet 410 and the negative electrode adapter sheet 214.

[0035] In one embodiment, the battery cell 40 includes a winding assembly 500 and a protective film layer 600 wrapped around the winding assembly 500. Specifically, the protective film layer 600 is a polyester film material. Specifically, the positive and negative electrode sheets are coated, baked, rolled, slit, wound, and flattened to form the winding assembly 500, and a flattened area 510 is formed after flattening.

[0036] In one embodiment, the housing 700 is square.

[0037] In one embodiment, the housing 700 is made of aluminum.

[0038] Specifically, the manufacturing process of this embodiment is as follows:

[0039] First, the top cover 110 is riveted to the positive electrode post 120 and the negative electrode post 130 and then welded to form the top cover 100. The positive electrode mounting hole 221 is then fitted with the positive electrode shaft end 121 of the positive electrode post 120 and then gap-welded. Similarly, the negative electrode mounting hole 211 is fitted with the negative electrode shaft end 131 of the negative electrode post 130 and then gap-welded. A first insulating sheet 300 with acrylic adhesive is then attached to the welding area of ​​the positive electrode post, and a second insulating sheet 300 with acrylic adhesive is attached to the welding area of ​​the negative electrode post. Insulating sheet 310 forms top cover assembly 50. Positive and negative electrode sheets are coated, baked, rolled, cut, wound and flattened to form winding assembly 500. After flattening, a flattening area 510 is formed. A protective film layer 600 is wrapped around the winding assembly 500 for protection. The top cover assembly 50 is slightly clamped to the cell 40 in the X direction. The first groove 222 of positive electrode adapter 224 and the second groove of negative electrode adapter 214 are welded by laser penetration welding. After adding thermally conductive and insulating materials to electrolytic fluororubber (soft material), the mixture is molded into a positive electrode thermally conductive insulating sheet 420 and a negative electrode thermally conductive insulating sheet 410. Acrylic double-sided adhesive is applied to the welding side mounting surfaces of the positive electrode thermally conductive insulating sheet 420, the negative electrode thermally conductive insulating sheet 410, the negative electrode tab 210, and the positive electrode tab 220. The positive electrode thermally conductive insulating sheet 420 is bonded to the positive electrode adapter 224 along the Y direction through the double-sided adhesive layer 411, and the negative electrode thermally conductive insulating sheet 410 is bonded to the negative electrode adapter 214 through the double-sided adhesive layer 411. The positive electrode thermally conductive insulating sheet 420 and the negative electrode thermally conductive insulating sheet 410 are tightly attached to the inner wall 710 of the outer shell 700 and inserted downward along the Z direction. Laser peripheral welding is used to firmly weld the top cover 100 to the outer shell 700. After normal liquid injection, formation and other post-processing, a complete lithium battery is formed.

[0040] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A square aluminum-cased battery with multiple tabs, characterized in that, include: shell; A battery cell is disposed within the housing, and the battery cell has a positive electrode tab and a negative electrode tab; The top cover is connected to the positive electrode tab and the negative electrode tab; A positive electrode thermally conductive insulating sheet, one side of which abuts against the positive electrode tab, and the other side of which abuts against the outer shell; A negative electrode thermally conductive insulating sheet, one side of which abuts against the negative electrode tab, and the other side of which abuts against the outer shell.

2. The all-tab square aluminum-cased battery according to claim 1, characterized in that, The top cover includes a top cover plate, a positive terminal post, and a negative terminal post. The top cover plate has a positive terminal mounting hole and a negative terminal mounting hole. The positive terminal post passes through the positive terminal mounting hole and is connected to the top cover plate. The negative terminal post passes through the negative terminal mounting hole and is connected to the top cover plate.

3. The all-tab square aluminum-cased battery according to claim 1, characterized in that, The positive electrode tab includes a positive electrode assembly piece and a positive electrode adapter piece, the positive electrode assembly piece and the positive electrode adapter piece are connected to form an L-shaped structure, and the negative electrode tab includes a negative electrode assembly piece and a negative electrode adapter piece, the negative electrode assembly piece and the negative electrode adapter piece are connected to form an L-shaped structure.

4. The all-tab square aluminum-cased battery according to claim 3, characterized in that, It also includes a first insulating sheet and a second insulating sheet, wherein the first insulating sheet is disposed between the positive electrode assembly piece and the battery cell, and the second insulating sheet is disposed between the negative electrode assembly piece and the battery cell.

5. The all-tab square aluminum-cased battery according to claim 3, characterized in that, The positive electrode adapter piece is provided with a first groove, and the negative electrode adapter piece is provided with a second groove.

6. The all-tab square aluminum-cased battery according to claim 5, characterized in that, The positive electrode adapter piece has multiple waist-shaped holes, and the negative electrode adapter piece has multiple waist-shaped holes.

7. The all-tab square aluminum-cased battery according to claim 3, characterized in that, It also includes a double-sided adhesive layer, which connects the positive electrode thermally conductive insulating sheet and the positive electrode adapter sheet, and the double-sided adhesive layer connects the negative electrode thermally conductive insulating sheet and the negative electrode adapter sheet.

8. The all-tab square aluminum-cased battery according to claim 1, characterized in that, The battery cell includes a winding assembly and a protective film layer wrapped around the winding assembly.

9. The all-tab square aluminum-cased battery according to claim 1, characterized in that, The outer shell is square.

10. The all-tab square aluminum-cased battery according to any one of claims 1-9, characterized in that, The outer shell is made of aluminum.

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