Blade battery top cover, battery shell and secondary battery

Abstract

The utility model provides a blade battery top cover, a battery shell and a secondary battery, a top cover piece is of a reverse U-shaped structure formed by connecting a long edge and two parallel short edges, and the top cover piece is of an integrated structure; the shell is a plate with a U-shaped structure; the structure of the special-shaped top cover and the aluminum shell is adopted, the top cover body is of a reverse U-shaped structure, the positive pole and the negative pole are located at the two ends respectively, the aluminum shell is of a forward U-shaped structure, the two faces of the aluminum shell in the Y direction are both in an open state, the upper surface of the aluminum shell in the Z direction is also in an open state, and the naked battery cell body can enter the interior from the upper surface of the aluminum shell in the Z direction and can also enter the interior from the two faces of the Y direction. By means of the special-shaped top cover and the aluminum shell structure, the shell entering process is simplified, the problem that the battery cell is difficult to enter the shell is solved, and the short circuit rate of the battery cell is reduced.

Description

Technical Field

[0001] The utility model relates to the field of lithium - ion batteries, in particular to a top cover of a blade battery, a battery case and a secondary battery. Background Technique

[0002] With the development of new energy, the existing batteries have further improved requirements for energy density. New - energy power batteries are usually secondary batteries, which refer to batteries that can activate active substances through charging after discharging and continue to be used.

[0003] At present, blade batteries have been widely used in the fields of hybrid vehicles and electric vehicles. They have advantages such as high energy density and high safety. In the existing blade - battery structure, the appearance is long - strip - shaped, and the top cover is divided into positive and negative electrode parts, which are respectively welded and fixed on both sides of the aluminum shell. This structure makes it difficult for the bare battery core to enter the shell, and there is a risk of abrasion and short - circuit when the bare battery core is assembled into the aluminum shell.

[0004] Therefore, we propose a top cover of a blade battery, a battery case and a secondary battery to solve the problems of difficult entry of the bare battery core into the shell and the risk of abrasion and short - circuit during entry. Content of the Utility Model

[0005] The purpose of the utility model is to solve the shortcomings existing in the prior art. To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A top cover of a blade battery includes a top - cover sheet. The top - cover sheet is connected by a long side and two parallel short sides to form an inverted "U" - shaped structure, and the top - cover sheet is an integral structure.

[0007] Further preferably, mounting holes and positioning grooves are opened on the short sides. A second liquid - injection hole is opened on one of the short sides, and a waist - shaped groove is opened on the other short side.

[0008] Further preferably, a first liquid - injection hole is opened on the long side.

[0009] Further preferably, a top cover of a blade battery further includes: an upper plastic, assembled outside the short side, and positioning posts matching the positioning grooves are arranged on the bottom surface of the upper plastic; a lower plastic, assembled inside the short side, and positioning posts matching the positioning grooves are arranged on the top surface of the lower plastic; a pole column, which sequentially penetrates through the lower plastic, the short side and the upper plastic from inside to outside, and there is a gap at the connection position of the pole column with the lower plastic and the short side; a sealing ring, located in the gap and sleeved on the outer wall of the pole column; a riveting block, covering the upper end of the pole column and riveted and fixed with the upper plastic; and pins, assembled on the bottom surface of the lower plastic and connected with the pole column.

[0010] A battery housing includes a housing body, which is a plate in a "U" shape; and the above-mentioned top cover of the blade battery; the top cover plate closes the open end of the housing body to form a closed space for accommodating a bare battery cell.

[0011] A secondary battery includes the above-mentioned battery housing.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] The present utility model adopts a special-shaped top cover and an aluminum shell structure. The main body of the top cover is in an inverted "U" shape, and the positive and negative electrode posts are located at both ends respectively. The aluminum shell is in a positive "U" shape, and both of its two surfaces in the Y direction are in an open state, and the upper surface in the Z direction is also in an open state. The main body of the bare battery cell can enter from the upper surface in the Z direction of the aluminum shell or from the two surfaces in the Y direction. After assembly, a tooling is used for limiting and pressing, and finally welding and fixing are carried out in sequence. Through the special-shaped top cover and aluminum shell structure, the process of entering the shell is simplified, the pain point of difficult entry of the battery cell into the shell is solved, and the short-circuit rate of the battery cell is reduced. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the top cover plate;

[0015] Figure 2 It is an exploded structural diagram of the battery top cover;

[0016] Figure 3 It is a schematic assembled structural diagram of the battery top cover;

[0017] Figure 4 It is a schematic structural diagram of the housing body;

[0018] Figure 5 It is a schematic structural diagram of the secondary battery.

[0019] In the figure: top cover plate 1, upper plastic 2, riveting block 3, lower plastic 4, sealing ring 5, electrode post 6, pin 7, housing body 8, long side 01, short side 02, first liquid injection hole 03, mounting hole 04, second liquid injection hole 05, waist-shaped groove 06. Detailed Embodiments

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0021] Referring to Figures 1 - 5 , a top cover of a blade battery includes a top cover plate 1. The top cover plate 1 is connected by a long side 01 and two parallel short sides 02 to form an inverted "U" shape, and the top cover plate 1 is an integral structure.

[0022] In the embodiment: The battery top cover has an inverted "U" - shaped structure, and the positive and negative electrode posts are located at both ends respectively. The aluminum shell has a forward "U" - shaped structure, and both of its two surfaces in the Y - direction are in an open state, and the upper surface in the Z - direction is also in an open state. After the bare battery cell is welded and fixed to the top cover, the shell - inserting process is carried out, and finally the welding and encapsulation are completed.

[0023] Mounting holes 04 and positioning grooves are provided on the short side 02. A second liquid injection hole 05 is provided on one of the short sides 02, and a waist - shaped groove 06 is provided on the other short side 02; a first liquid injection hole 03 is provided on the long side 01.

[0024] In the embodiment: Liquid can be injected into the battery through the first liquid injection hole 03 and the second liquid injection hole 05. The positioning groove is used to cooperate with the positioning posts on the upper plastic 2 and the lower plastic 4 for fixing. The waist - shaped groove 06 is used for assembling the explosion - proof valve. A protective sheet is provided on the explosion - proof valve, and the protective sheet is pasted above the explosion - proof valve. The explosion - proof valve can break when the internal pressure of the battery cell reaches the critical point, which can effectively prevent the explosion caused by excessive pressure inside the battery cell. At the same time, the protective sheet can protect the explosion - proof valve from external influences.

[0025] It further includes: an upper plastic 2, assembled on the outside of the short side 02, and positioning posts that cooperate with the positioning grooves are provided on the bottom surface of the upper plastic 2; a lower plastic 4, assembled on the inside of the short side 02, and positioning posts that cooperate with the positioning grooves are provided on the top surface of the lower plastic 4; an electrode post 6, which sequentially passes through the lower plastic 4, the short side 02, and the upper plastic 2 from the inside to the outside. There is a gap at the connection position between the electrode post and the lower plastic 4 and the short side 02; a sealing ring 5, which is located in the gap and sleeved on the outer wall of the electrode post 6; a riveting block 3, covering the upper end of the electrode post 6 and riveted and fixed to the upper plastic 2; a lead pin 7, assembled on the bottom surface of the lower plastic 4 and connected to the electrode post 6.

[0026] In the embodiment: The electrode post 6 includes a positive electrode post and a negative electrode post. The positive electrode post is installed on one of the short sides 02, and the negative electrode post is installed on the other short side 02.

[0027] A battery shell includes: a shell 8, which is a plate in a "U" - shaped structure; and the above - mentioned blade - type battery top cover; the top cover sheet 1 closes the open end of the shell 8 to form a closed space, and the closed space is used to accommodate the bare battery cell.

[0028] In the embodiment: The raw material of the shell 8 is an aluminum plate, which is bent into a "U" - shaped structure through two creases. And the aluminum plate comes in a coil form with a relatively long incoming length. Therefore, after the aluminum is bent and formed, the aluminum shell can be cut according to the required length.

[0029] In the embodiment: First, the housing 8 is bent first to form an "L"-shaped flange, and then the two housings 8 are separately fixed by a tooling, and then laser welded to finally form a "U"-shaped structure. This forming method has a relatively simple and flexible forming device and a low price cost.

[0030] A secondary battery includes the battery housing described above.

[0031] In the embodiment: First, after the bare battery cell is welded to the pin 7 and covered with an insulating sheet, it is assembled into the housing 8. Since the housing 8 is in the form of a "U"-shaped outward expansion, therefore, the battery cell can enter the inside of the aluminum housing from the upper surface in the Z direction, or can enter from the two surfaces in the Y direction. After the assembly is completed, a tooling is used for limiting and pressing, and finally welding and fixing are carried out in sequence.

[0032] The utility model adopts a special-shaped top cover and an aluminum housing structure. The main body of the top cover is in an inverted "U"-shaped structure, and the positive and negative electrode posts are respectively located at both ends. The aluminum housing is in a positive "U"-shaped structure, and both of its two surfaces in the Y direction are in an open state, and the upper surface in the Z direction is also in an open state. The main body of the bare battery cell can enter the inside from the upper surface in the Z direction of the aluminum housing, or can enter from the two surfaces in the Y direction. After the assembly is completed, a tooling is used for limiting and pressing, and finally welding and fixing are carried out in sequence. Through the special-shaped top cover and the aluminum housing structure, the process of entering the housing is simplified, the pain point of difficult battery cell entering the housing is solved, and the short-circuit rate of the battery cell is reduced.

Claims

1. A blade battery top cover, characterized in that: It includes a top cover piece, which is connected by a long side and two parallel short sides to form a reverse "U"-shaped structure, and the top cover piece is an integrated structure; the short sides are provided with mounting holes and positioning grooves, one of the short sides is provided with a second liquid injection hole, and the other short side is provided with a waist-shaped groove; the long side is provided with a first liquid injection hole.

2. A blade battery top cover according to claim 1, characterized in that: Also includes: The upper plastic is assembled on the outer side of the short side, and the bottom surface of the upper plastic is provided with a positioning column matched with the positioning groove; A lower plastic is assembled on the inner side of the short side, and a positioning column matched with the positioning groove is arranged on the top surface of the lower plastic; A pole, wherein the pole is sequentially passed through the lower plastic, the short side and the upper plastic from the inside to the outside, and a gap is provided at the connection position between the pole, the lower plastic and the short side; A sealing ring, the sealing ring is located in the gap and sleeved on the outer wall of the pole; A riveting block, which is arranged on the upper end of the pole and is fixed with the upper plastic by riveting; The pin is assembled on the lower plastic bottom surface and connected to the pole.

3. A battery casing, characterized in that: include: A shell, wherein the shell is a plate having a "U"-shaped structure; And the blade battery top cover as claimed in claim 2; The top cover sheet closes the open end of the shell to form a closed space, and the closed space is used to accommodate the bare battery cell.

4. A secondary battery, characterized in that: The invention comprises the battery casing as claimed in claim 3.

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