Square aluminum shell battery welding adapter piece

Abstract

The utility model discloses a square aluminum shell battery welding switching piece, which comprises a switching piece, a pole column welding area and a top cover welding area, one end of the switching piece is provided with the pole column welding area, the other end of the switching piece is provided with the top cover welding area, the top cover welding area is of a U-shaped structure, the top cover welding area comprises two top cover welding pieces which extend outwards from the end face of the switching piece, and the two top cover welding pieces are connected with the switching piece. A rectangular notch defined by the inner sides of the two top cover welding pieces and the middle section of the end face of the switching piece is a liquid injection hole receding area, a flow dividing blocking piece is arranged in the liquid injection hole receding area, liquid flow gaps are formed between the two side edges of the flow dividing blocking piece and the inner sides of the top cover welding pieces, the inner end of the flow dividing blocking piece is connected to the middle section of the end face of the switching piece, and the outer end of the flow dividing blocking piece is a free end. The upper part of the center of the shunting baffle plate is aligned with a liquid injection hole of the aluminum shell battery, and electrolyte injected into the shell from the liquid injection hole flows downwards into the shell from liquid flow gaps on two sides after being blocked by the shunting baffle plate; the adapter piece can solve the problems of powder falling at the edge of the battery pole piece caused by liquid injection into the battery shell, and improve the self-discharge and micro short circuit of the battery.

Description

TECHNICAL FIELD

[0001] The utility model belongs to new energy battery technical field, concretely relates to a square aluminum shell battery welding adapter piece. BACKGROUND

[0002] At present, square shell batteries have been widely used in power, energy storage and other fields, and their structures are suitable for lithium ion batteries, sodium ion batteries and other systems. A square shell battery is generally composed of a positive electrode sheet, a negative electrode sheet, a separator, a top cover, a shell, an adapter piece, a Mylar film, an electrolyte, a sealing nail and other components. The main steps are to wind or stack the positive electrode sheet, the negative electrode sheet and the separator into a roll core, then to weld the tab of the roll core on the adapter piece by ultrasonic welding, to weld the top cover together and to seal weld with the shell, and finally to inject electrolyte into the battery, complete the sealing nail welding and complete the assembly of the battery.

[0003] At present, with the pursuit of high capacity density in the battery industry, the edge of the electrode sheet is brittle and prone to powder falling. The electrolyte is injected through the injection hole under positive pressure, and the electrolyte passes through the injection hole at a high speed, which will impact the edge of the fragile electrode sheet, causing some electrode sheet edges to fall off, and the falling electrode sheet powder is easy to cause internal micro-short circuit of the electrode, fast self-discharge of the battery, and appearance problems of the battery.

[0004] Two solutions are used in the industry: one is that the top cover injection hole directly faces the electrode sheet, which is simple in structure and has no manufacturing difficulties, but it aggravates the risk of electrode sheet powder falling; the other is to increase a shunt device on the top cover to slow down the impact force of electrolyte flushing the edge of the electrode sheet (such as CN 219476827 U, CN 216903140 U, etc.). The top cover mainly includes a positive terminal, a negative terminal, a positive upper plastic, a negative upper plastic, a lower plastic, a pressure relief valve and a pressure relief valve protection film, and other components, so the cost of the top cover is relatively high. If a shunt device is added to the top cover, the cost and manufacturing difficulty of the top cover will be increased. UTILITY MODEL CONTENTS

[0005] In view of the above problems and technical needs, the utility model provides a square aluminum shell battery welding adapter piece, which can solve the problem of electrode sheet edge powder falling caused by injecting electrolyte into the battery shell, improve the self-discharge and micro-short circuit of the battery, and improve the performance of the battery.

[0006] The utility model discloses a technical scheme as follows: a square aluminum shell battery welding adapter piece, including adapter piece, pole post welding area and top cover welding area, one end of adapter piece is equipped with pole post welding area, and the other end is equipped with top cover welding area, and the top cover welding area is U-shaped structure, and the top cover welding area includes two top cover welding pieces extending outward from the adapter piece end face, and the rectangular gap formed by the two top cover welding piece inner side and the adapter piece end face middle section is liquid injection hole avoidance area, and the liquid injection hole avoidance area is equipped with shunt baffle, and the liquid flow gap is formed between the both sides of shunt baffle and the top cover welding piece inner side, and the inner end of shunt baffle is connected on the adapter piece end face middle section, and the outer end of shunt baffle is free end, and the upper part of the center of shunt baffle is aligned with the liquid injection hole of aluminum shell battery, and the electrolyte injected into the shell from the liquid injection hole flows into the shell downward from the liquid flow gap on both sides after being blocked by shunt baffle.

[0007] The adapter piece sets the avoidance area of U-shaped structure at the position opposite to the liquid injection hole, can avoid blocking the liquid injection hole, and the electrolyte injected from the liquid injection hole directly impacts the central area of shunt baffle, then flows outward along the surface of shunt baffle, and finally converges downward from the free end of shunt baffle and the liquid flow gap on both sides, the central area of shunt baffle resists the impact of electrolyte, eliminates the impact force of electrolyte, reduces the speed of electrolyte flow, and avoids the problem of powder falling caused by the direct flushing of electrolyte to the edge of adapter piece, and simultaneously, since the outer end of shunt baffle is free end, when the impact force of liquid flow is too large, shunt baffle can adaptively swing and adjust, the toughness of shunt baffle is higher, and the sudden breaking condition when the stress is too large can be avoided, thereby protecting the adapter piece.

[0008] Further, the connection between the inner end of the shunt baffle and the middle section of the adapter piece end face is set as a stepped structure, the adapter piece and the top cover welding piece are at the same height position, the shunt baffle is lower than the height position of the adapter piece.

[0009] Further, the avoidance height difference between the shunt baffle and the adapter piece ranges from 1 to 5 mm.

[0010] By setting the stepped transition connection part, the height difference of liquid flow between the shunt baffle and the adapter piece is formed, the liquid injection hole position is reasonably avoided, the electrolyte is not blocked when injecting, the avoidance area has a guiding effect on the electrolyte, the electrolyte will not flow to the adapter piece, but only flow on the shunt baffle and converge downward through the edge of the shunt baffle, the other part of the edge of the adapter piece is well protected, and the probability of powder falling caused by the impact of liquid flow is reduced.

[0011] Further, the pole post welding area is T-shaped structure, the wide end of the pole post welding area is connected with the end of the adapter piece, and the middle part of the wide end outside extends outward to form the pole post welding piece.

[0012] Further, the wide end of the pole welding area and the connecting part of the adapter piece are a stepped expansion area, and the stepped expansion area has expansion ductility. The stepped expansion area is arranged between the pole welding area and the adapter piece to ensure that the pole welding piece has a certain ductility. Because the battery cell will expand internally during the charging and discharging process due to a chemical reaction, the expansion is manifested as expansion to both sides. If the pole welding position does not have a certain ductility, the pole welding position may crack due to pulling, thereby causing a leakage and other safety problems. Therefore, the stepped expansion area can improve the safety and performance of welding.

[0013] Further, the adapter piece, the pole welding area and the top cover welding area are integrally formed.

[0014] Further, the adapter piece is made of aluminum-copper alloy material. The aluminum-copper alloy material has high ductility, and the surface of the adapter piece is locally processed into a stepped type and a stepped type without manufacturing difficulties. Compared with a conventional adapter piece, the aluminum-copper alloy material does not increase the production difficulty and production cost.

[0015] The utility model discloses a kind of adapter pieces of square aluminum shell battery welding, including top cover welding piece, adapter piece, pole welding area and top cover welding area, adapter piece is connected between top cover welding piece and pole welding area, and top cover welding area is connected between top cover welding piece and pole welding area. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a three-dimensional structure diagram of the utility model square aluminum shell battery welding adapter piece;

[0017] Fig. 2 It is the front view structure diagram of the utility model square aluminum shell battery welding adapter piece;

[0018] Fig. 3 It is the side view structure diagram of the utility model square aluminum shell battery welding adapter piece;

[0019] Marked in drawing: adapter piece 1, top cover welding piece 2, liquid injection hole avoidance area 3, shunt baffle 4, liquid flow gap 41, stepped structure 42, pole welding piece 5, stepped expansion area 51. DETAILED DESCRIPTION

[0020] The application will be further described below in combination with drawings and examples.

[0021] AsFigs. 1-3 The utility model relates to a square aluminum shell battery welding adapter piece, including adapter piece 1, pole post welding area and top cover welding area, one end of adapter piece 1 is equipped with pole post welding area, and the other end is equipped with top cover welding area, and top cover welding area is U type structure, and top cover welding area includes two top cover welding pieces 2 that extend from the adapter piece end face outward, the rectangular gap that the inside of two top cover welding pieces 2 and the middle section of adapter piece end face enclose is liquid injection hole avoidance area 3, and the inside of liquid injection hole avoidance area 3 is equipped with shunt baffle 4, and the liquid flow gap 41 between the both sides of shunt baffle 4 and the inside of top cover welding piece 2 is equipped with, the inside end of shunt baffle 4 is connected on the middle section of adapter piece end face, and the outside end of shunt baffle 4 is free end, and the center of shunt baffle 4 is aligned with the liquid injection hole of aluminum shell battery, and the electrolyte injected from the liquid injection hole into the shell flows down into the shell from the liquid flow gap 41 of both sides after the obstruction of shunt baffle 4.

[0022] The connection of the inside end of shunt baffle 4 and the middle section of adapter piece end face is provided with ladder type structure 42, and adapter piece 1 and top cover welding piece 2 are at the same height position, and shunt baffle 4 and adapter piece 1 have avoidance height difference, and shunt baffle 4 is lower than the height position of adapter piece. The avoidance height difference between shunt baffle 4 and adapter piece 1 ranges from 1 to 5mm.

[0023] The adapter piece 1, pole post welding area and top cover welding area are integrally formed. The adapter piece 1 is made of aluminum-copper alloy material. The aluminum-copper alloy material has high ductility, and the surface of the adapter piece is locally processed into ladder type and step type without manufacturing difficulties. Compared with conventional connecting pieces, the aluminum-copper alloy material does not increase production difficulty and production cost.

[0024] The pole post welding area is in T-shaped structure, the wide end of the pole post welding area is connected with the end of the adapter piece 1, and the wide end extends outward to form a pole post welding piece 5. The connection part of the wide end of the pole post welding area 5 and the adapter piece 1 is a step type expansion area 51, and the step type expansion area 51 has expansion ductility. The step type expansion area 51 is arranged between the pole post welding area and the adapter piece 1 to ensure that the pole post welding piece 5 has certain ductility. Because the battery cell will expand during the charging and discharging process due to chemical reaction, which shows expansion to both sides. If the pole post welding position does not have certain ductility, the pole post welding position may crack due to pulling, which may cause liquid leakage and other safety problems. Therefore, the step type expansion area can improve the safety and performance of welding.

[0025] The application principle of the utility model discloses: the electrolyte that injects from the liquid injection hole directly impacts the center area of the shunt baffle 4, then flows outward along the surface of the shunt baffle 4, finally gathers downward from the free end of the shunt baffle 4 and the liquid flow gap 41 of both sides, the center area of the shunt baffle 4 resists the impact of electrolyte, eliminates the impact force of electrolyte, reduces the speed of electrolyte flow, improves the phenomenon of the edge of the pole piece powder drop caused by liquid injection, avoids the problem of battery internal short circuit and self-discharge acceleration, simultaneously, the outer end of the shunt baffle 4 is the free end, when the impact force of liquid flow is too big, the shunt baffle 4 can carry out adaptive swing adjustment, the shunt baffle is more tenacious, can avoid the condition of sudden breakage when the stress is too big, has the protection effect to the adapter piece 1.

[0026] The above is only the preferable several embodiments of the utility model, but the protection scope of the utility model does not limit to this, any skilled person in the art can easily think of the change and replacement in the technical range disclosed by the utility model, and all should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be the protection scope of the claims.

Claims

1. A square prismatic aluminum can battery welding tab, characterized by: The adapter piece, the pole welding area and the top cover welding area are included, one end of the adapter piece is provided with the pole welding area, the other end is provided with the top cover welding area, the top cover welding area is a U-shaped structure, the top cover welding area includes two top cover welding pieces extending outward from the end face of the adapter piece, the rectangular gap enclosed by the inner side of the two top cover welding pieces and the middle section of the end face of the adapter piece is the liquid injection hole avoidance area, the liquid injection hole avoidance area is provided with a shunt baffle, the liquid flow gap is arranged between the two side edges of the shunt baffle and the inner side of the top cover welding piece, the inner end of the shunt baffle is connected to the middle section of the end face of the adapter piece, and the outer end of the shunt baffle is a free end; the upper part of the center of the shunt baffle is aligned with the liquid injection hole of the aluminum shell battery, and the electrolyte injected into the shell from the liquid injection hole flows into the shell downward from the liquid flow gaps on both sides after being blocked by the shunt baffle.

2. The square prismatic aluminum can battery welding adapter of claim 1, wherein: The connection between the inner end of the shunt baffle and the middle section of the end face of the adapter piece is provided with a stepped structure, the adapter piece and the top cover welding piece are at the same height position, the shunt baffle and the adapter piece have an avoidance height difference, and the height position of the shunt baffle is lower than that of the adapter piece.

3. The square prismatic aluminum can battery welding adapter of claim 2, wherein: The avoidance height difference between the shunt baffle and the adapter piece ranges from 1 to 5 mm.

4. The square prismatic aluminum can battery welding adapter of claim 3, wherein: The pole welding area is a T-shaped structure, the wide end of the pole welding area is connected with the end of the adapter piece, and the middle part of the outer side of the wide end extends outward to form a pole welding piece.

5. The square prismatic aluminum can battery welding adapter of claim 4, wherein: The connection part between the wide end of the pole welding area and the adapter piece is a stepped expansion area, and the stepped expansion area has expansion ductility.

6. The square prismatic aluminum battery welding adapter plate of claim 5, wherein: The adapter piece, the pole welding area and the top cover welding area are integrally formed.

7. The square prismatic aluminum can battery welding adapter of claim 6, wherein: The adapter piece is made of aluminum-copper alloy material.

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