Square aluminum shell lithium ion battery cover plate and battery cell assembly structure

Abstract

The utility model relates to a square aluminum shell lithium ion battery cover plate and cell assembly structure, which comprises a cover plate and a roll core, a positive pole column and a negative pole column of the cover plate have the same structure, each of the positive pole column and the negative pole column comprises an aluminum block with a through hole, an outer ring of the aluminum block with the through hole is provided with an injection molding part and is connected with the cover plate through the injection molding part, and the roll core is provided with a positive pole lug and a negative pole lug. The two tabs are respectively connected with the lower ends of the positive pole connecting sheet and the negative pole connecting sheet, the upper ends of the positive pole connecting sheet and the negative pole connecting sheet are respectively connected with the top ends of the positive pole post and the negative pole post through holes in the aluminum block penetrating through the holes, and the positive pole tab, the positive pole connecting sheet and the positive pole post are all vertically arranged and are vertical to the thickness direction of the roll core; and the negative electrode lug, the negative electrode connecting piece and the negative electrode post are all vertically arranged and are perpendicular to the thickness direction of the roll core. According to the assembly structure, the problem of short circuit caused by insertion of the copper foil or the aluminum foil into the roll core due to folding of the tabs is avoided, and welding between the negative connecting piece and the bottom of the negative pole is reduced, so that the explosion welding phenomenon is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to lithium ion battery technical field, concretely relates to a square aluminium shell lithium ion battery cover plate and electric core assembly structure. BACKGROUND

[0002] Lithium ion battery as green power is widely used in electric power storage, household energy storage, traffic and other fields because of small size, no pollution, low cost and other advantages. In recent years, lithium ion battery technology has developed rapidly, and the technical route is constantly mature. Among them, square aluminum shell battery is widely researched and developed on a large scale because of high capacity and excellent performance.

[0003] At present, in the square aluminum shell lithium ion battery cover plate and electric core assembly structure, the positive pole column arranged on the cover plate and the positive pole lug arranged on the electric core are respectively welded with the positive pole aluminum connecting piece, and the negative pole column arranged on the cover plate and the negative pole lug arranged on the electric core are respectively welded with the negative pole copper connecting piece. During the assembly process, the lug needs to be folded. The main folding methods for the lug are butterfly welding for hard connecting piece and lug folding for soft connecting piece. Both methods have the risk of copper foil or aluminum foil inserted into the inside of the roll core caused by lug folding, which leads to short circuit and reduces the yield of the roll core. In addition, the traditional negative pole copper connecting piece needs to be welded with the bottom metal sheet of the negative pole column, which has the problem of explosive welding, which causes the sealing ring to be broken, resulting in poor battery sealing and even causing the electric core to be scrapped.

[0004] Chinese patent CN201821345120.5 discloses a kind of assembly structure of power battery top cover and electric core, including top cover and electric core, the top cover is provided with first pole column and second pole column, the electric core is provided with first lug and second lug, the first lug is electrically connected with the first pole column by first connecting piece, the second lug is electrically connected with the second pole column by second connecting piece;In the assembly process of this patent, the lug needs to be folded, which has the risk of copper foil or aluminum foil inserted into the inside of the roll core, thereby causing short circuit. SUMMARY

[0005] The utility model aims at providing a kind of assembly structure of lithium ion battery cover plate and electric core, not only avoid the short circuit problem caused by the folding of positive pole lug and negative pole lug, which leads to the insertion of copper foil or aluminum foil into the inside of roll core, but also reduce the welding process of negative pole connecting piece and negative pole column bottom, thereby avoiding the problem of poor sealing caused by the breakage of sealing ring caused by explosive welding phenomenon.

[0006] The utility model discloses a technical scheme that solves the above problems is adopted: a square aluminium shell lithium ion battery cover plate and electric core assembly structure, including cover plate and roll core, the cover plate is equipped with positive pole and negative pole, the positive pole and negative pole structure are same, and the utilization rate is high, and it is favorable for reducing cost, the positive pole and negative pole all are penetrated to the cover plate through the pole hole, the roll core is equipped with positive pole lug and negative pole lug, the positive pole and negative pole all include the aluminium block with the opening, the aluminium block with the opening outside circle is equipped with injection moulded part and is connected cover plate through injection moulded part, the pole hole is internally mounted with sealing ring and the cover plate abuts and forms the sealing, the positive pole lug is connected positive connection piece lower end, and the positive connection piece top end is connected with the aluminium block top end through the opening in the aluminium block with the opening, and the positive pole lug, positive connection piece and positive pole column direction are same and vertically arranged and are perpendicular to the roll core thickness direction, the negative pole lug is connected negative connection piece lower end, and the negative connection piece top end is connected with the aluminium block top end through the opening in the aluminium block with the opening, and the negative pole lug, negative connection piece and negative pole column direction are same and vertically arranged and are perpendicular to the roll core thickness direction.

[0007] Preferably, the injection molded part, the aluminum block with the opening, and the sealing ring are in mutual extrusion.

[0008] Preferably, the positive connection piece is an aluminum positive connection piece, and the positive connection piece is rectangular or trapezoidal.

[0009] Preferably, the negative connection piece is composed of an upper aluminum negative connection piece and a lower copper negative connection piece, and the positive connection piece is rectangular or trapezoidal.

[0010] Preferably, the opening in the aluminum block with the opening is matched in size and shape with the upper end of the positive connection piece and the upper end of the negative connection piece.

[0011] Preferably, the cover plate is further provided with a liquid injection port and an explosion-proof valve, and the liquid injection port and the explosion-proof valve are located in the middle of the cover plate.

[0012] Preferably, the top end of the positive connection piece is connected with the top end of the aluminum block with the opening through the opening in the aluminum block with the opening, and specifically, four edges of the top end of the positive connection piece are laser-welded with the top end of the aluminum block with the opening.

[0013] Preferably, the top end of the negative connection piece is connected with the top end of the aluminum block with the opening through the opening in the aluminum block with the opening, and specifically, four edges of the top end of the negative connection piece are laser-welded with the top end of the aluminum block with the opening.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] In this utility model's lithium-ion battery cover and cell assembly structure, the positive electrode tab of the core is connected to the lower end of the positive electrode connecting piece, and the upper end of the positive electrode connecting piece is connected to the top of the positive electrode post through an opening in an aluminum block with a through hole. The positive electrode tab, positive electrode connecting piece, and positive electrode post are all vertically arranged in the same direction and perpendicular to the thickness direction of the core. The negative electrode tab of the core is connected to the lower end of the negative electrode connecting piece, and the upper end of the negative electrode connecting piece is connected to the top of the negative electrode post through an opening in an aluminum block with a through hole. The negative electrode tab, negative electrode connecting piece, and negative electrode post are all vertically arranged in the same direction and perpendicular to the thickness direction of the core. This arrangement not only avoids the short circuit problem caused by the copper foil or aluminum foil being inserted into the core due to folding of the positive and negative electrode tabs, but also reduces the welding process between the negative electrode connecting piece and the bottom of the negative electrode post, thereby avoiding the sealing problem caused by the sealing ring being punctured due to the burst welding phenomenon. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the assembly of the square aluminum shell lithium-ion battery cover and the core in an embodiment of this utility model.

[0017] Figure 2 This is a top view of the square aluminum-cased lithium-ion battery cover plate in an embodiment of this utility model.

[0018] Figure 3 This is a cross-sectional view of the square aluminum-cased lithium-ion battery cover plate in an embodiment of this utility model.

[0019] Figure 4 This is a schematic diagram of the core structure in an embodiment of this utility model.

[0020] Figure 5 This is a schematic diagram of the positive electrode connecting piece in an embodiment of this utility model.

[0021] Figure 6 This is a schematic diagram of the connection between the electrode lug and the positive electrode connecting piece in the core of this utility model embodiment.

[0022] Wherein: 1 is the cover plate, 1.1 is the positive electrode post, 1.2 is the negative electrode post, 1.3 is the liquid injection port, 1.4 is the explosion-proof valve, 1.1.1 is the aluminum block with a through hole, 1.1.2 is the injection molded part, 1.1.3 is the sealing ring, 2 is the core, 2.1 is the positive electrode tab, 2.2 is the negative electrode tab, 3.1 is the positive electrode connecting piece, and 3.2 is the negative electrode connecting piece. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] like Figure 1 The diagram shown is a structural schematic of the assembly of the square aluminum-cased lithium-ion battery cover plate and the core in an embodiment of this utility model.

[0025] As Figure 2 shown in the utility model embodiment, the top view of square aluminum shell lithium ion battery cover plate.

[0026] As Figure 3 shown in the utility model embodiment, the sectional view of square aluminum shell lithium ion battery cover plate.

[0027] A square aluminum shell lithium ion battery cover plate and cell assembly structure, comprising cover plate 1 and roll core 2, the cover plate 1 is equipped with injection port 1.3 and explosion-proof valve 1.4, the injection port 1.3 and explosion-proof valve 1.4 are located in the middle of cover plate 1.

[0028] The cover plate 1 is equipped with positive pole 1.1 and negative pole 1.2, the positive pole 1.1 and negative pole 1.2 are same in structure, and high in utilization, which is conducive to reducing cost, the positive pole 1.1 and negative pole 1.2 are all penetrated to the cover plate 1 through pole hole, the positive pole 1.1 and negative pole 1.2 all include aluminum block 1.1.1 with opening, the outer ring of aluminum block 1.1.1 with opening is equipped with injection molding 1.1.2 and is connected to cover plate 1 through injection molding 1.1.2, the sealing ring 1.1.3 is installed in the inside of pole hole and is abutted to the cover plate 1 to form sealing, the injection molding 1.1.2, aluminum block 1.1.1 with opening and sealing ring 1.1.3 are mutually extruded.

[0029] As Figure 4 shown in the utility model embodiment, the structure schematic diagram of roll core;As Figure 6 shown in the utility model embodiment, the structure schematic diagram of the connection of the tab in roll core and positive connection sheet.

[0030] The positive electrode tab 2.1 is connected with the lower end of the positive electrode connecting piece 3.1, the top end of the positive electrode connecting piece 3.1 is connected with the top end (i.e. the top end of the positive electrode post) of the aluminum block 1.1.1 with a hole, and the specific connection manner is that the four edges of the top end of the positive electrode connecting piece 3.1 are laser welded with the top end of the aluminum block 1.1.1 with a hole; the size and shape of the hole in the aluminum block 1.1.1 with a hole are matched with the upper end of the positive electrode connecting piece 3.1, the positive electrode tab 2.1, the positive electrode connecting piece 3.1 and the positive electrode post 1.1 are vertically arranged in the same direction and are perpendicular to the thickness direction of the roll core 2; the negative electrode tab 2.2 is connected with the lower end of the negative electrode connecting piece 3.2, the top end of the negative electrode connecting piece 3.2 is connected with the top end (i.e. the top end of the negative electrode post) of the aluminum block 1.1.1 with a hole, and the specific connection manner is that the four edges of the top end of the negative electrode connecting piece 3.2 are laser welded with the top end of the aluminum block 1.1.1 with a hole; the size and shape of the hole in the aluminum block 1.1.1 with a hole are matched with the upper end of the negative electrode connecting piece 3.2, the negative electrode tab 2.2, the negative electrode connecting piece 3.2 and the negative electrode post 1.2 are vertically arranged in the same direction and are perpendicular to the thickness direction of the roll core 2.

[0031] As shown in Figure 5 The structure diagram of the positive electrode connecting piece in the embodiment of the utility model.

[0032] The positive electrode connecting piece 3.1 is an aluminum positive electrode connecting piece, the positive electrode connecting piece 3.1 is in a ladder shape, the negative electrode connecting piece 3.2 is composed of an upper end aluminum negative electrode connecting piece and a lower end copper negative electrode connecting piece, that is, the upper end aluminum negative electrode connecting piece is connected with the top end of the negative electrode post 1.2, and the lower end copper negative electrode connecting piece is connected with the negative electrode tab, the negative electrode connecting piece 3.2 is in a ladder shape, and the positive electrode connecting piece 3.1 and the negative electrode connecting piece 3.2 are the same in shape and size.

[0033] In actual application, the positive electrode tab 2.1 of the roll core 2 is welded with the lower end of the positive electrode connecting piece 3.1 to form a welding area 4, the positive electrode connecting piece 3.1 with the positive electrode tab 2.1 welded is welded with the top end of the positive electrode post 1.1 through the hole in the aluminum block 1.1.1 with a hole, the negative electrode tab 2.2 of the roll core 2 is welded with the lower end of the negative electrode connecting piece 3.2 to form a welding area 4, and the negative electrode connecting piece 3.2 with the negative electrode tab 2.2 welded is welded with the top end of the negative electrode post 1.2 through the hole in the aluminum block 1.1.1 with a hole.

[0034] In addition to the above-mentioned embodiments, the utility model also includes other implementation manners, and the technical solutions formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the utility model claims.

Claims

1. A square aluminum-cased lithium-ion battery cover and cell assembly structure, comprising a cover plate (1) and a core (2), wherein the cover plate (1) is provided with a positive electrode post (1.1) and a negative electrode post (1.2), both the positive electrode post (1.1) and the negative electrode post (1.2) passing through the cover plate (1) via electrode post holes, and the core is provided with a positive electrode tab (2.1) and a negative electrode tab (2.2), characterized in that: Both the positive electrode post (1.1) and the negative electrode post (1.2) include an aluminum block (1.1.1) with a through hole. The outer ring of the aluminum block (1.1.1) with the through hole is provided with an injection molded part (1.1.2) and is connected to the cover plate (1) through the injection molded part (1.1.2). A sealing ring (1.1.3) is installed inside the electrode post hole and abuts against the cover plate (1) to form a seal. The positive electrode tab (2.1) is connected to the lower end of the positive electrode connecting piece (3.1). The top end of the positive electrode connecting piece (3.1) is connected to the aluminum block (1.1.1) with the through hole through the hole through the hole. 1) Top connection: The positive electrode tab (2.1), positive electrode connecting piece (3.1) and positive electrode post (1.1) are vertically arranged in the same direction and perpendicular to the thickness direction of the core (2); the negative electrode tab (2.2) is connected to the lower end of the negative electrode connecting piece (3.2), and the top of the negative electrode connecting piece (3.2) is connected to the top of the aluminum block (1.1.1) with the through hole through the hole; the negative electrode tab (2.2), negative electrode connecting piece (3.2) and negative electrode post (1.2) are vertically arranged in the same direction and perpendicular to the thickness direction of the core (2).

2. The square aluminum shell lithium-ion battery cover and cell assembly structure according to claim 1, characterized in that: The injection molded part (1.1.2), the aluminum block with through holes (1.1.1), and the sealing ring (1.1.3) are pressed against each other.

3. The square aluminum-cased lithium-ion battery cover and cell assembly structure according to claim 1, characterized in that: The positive electrode connecting piece (3.1) is an aluminum positive electrode connecting piece, and the positive electrode connecting piece (3.1) is rectangular or trapezoidal.

4. The square aluminum shell lithium-ion battery cover and cell assembly structure according to claim 1, characterized in that: The negative electrode connecting piece (3.2) is composed of an upper aluminum negative electrode connecting piece and a lower copper negative electrode connecting piece, and the negative electrode connecting piece (3.2) is rectangular or trapezoidal.

5. The square aluminum-cased lithium-ion battery cover and cell assembly structure according to claim 1, characterized in that: The size and shape of the opening in the aluminum block (1.1.1) with the through hole match the upper end of the positive electrode connecting piece (3.1) and the upper end of the negative electrode connecting piece (3.2).

6. The square aluminum-cased lithium-ion battery cover and cell assembly structure according to claim 1, characterized in that: The cover plate (1) is also provided with an injection port (1.3) and an explosion-proof valve (1.4).

7. The square aluminum-cased lithium-ion battery cover and cell assembly structure according to claim 1, characterized in that: The top of the positive electrode connecting piece (3.1) is connected to the top of the aluminum block (1.1.1) with the through hole through the hole via the opening. Specifically, the four sides of the top of the positive electrode connecting piece (3.1) are laser welded to the top of the aluminum block (1.1.1) with the through hole.

8. The square aluminum-cased lithium-ion battery cover and cell assembly structure according to claim 1, characterized in that: The top of the negative electrode connecting piece (3.2) is connected to the top of the aluminum block (1.1.1) with the through hole through the hole via an opening in the opening. Specifically, the four sides of the top of the negative electrode connecting piece (3.2) are laser welded to the top of the aluminum block (1.1.1) with the through hole.

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