A new type of square power battery

Abstract

The utility model provides a novel square power battery, which relates to the technical field of power batteries, an outer shell, a bare battery cell is installed inside, a pole ear is arranged on the side of the bare battery cell, an insulating film is wrapped outside the bare battery cell, and a hot melting point is arranged on the top surface of the insulating film; a top cover is welded to the upper opening of the outer shell, a lower plastic is installed below the top cover, and a hot melting position is arranged on the bottom surface of the lower plastic corresponding to the hot melting point, a blue film is arranged on the inner wall of the outer shell, and the blue film is located outside the insulating film, and the hot melting position includes a first hot melting part, a second hot melting part and a third hot melting part, so as to ensure that the firmness of the connection between the lower plastic and the insulating film is improved without damaging the bare battery cell and affecting the normal connection between the pole column, the connecting piece and the pole ear, so as to avoid the poor welding of the shell cover caused by the misalignment or even looseness of the battery cell.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and more specifically, to a novel square power battery. Background Art

[0002] As environmental issues become increasingly prominent, low-carbon economy has become the mainstream of future economic development. New energy will gradually replace traditional environmentally polluting energy. As a representative of new energy, power batteries have gradually been recognized by manufacturers and consumers. As the main power source of new energy vehicles, power batteries have become one of the key components of electric vehicles.

[0003] As a key component of electric vehicles, the speed of charging directly determines whether it can be comparable to gasoline vehicles, so electric vehicles require charging at a high rate. At present, patent CN205385061U provides a secondary battery, which is mainly used in the market for high-rate discharge at the moment of car starting, but it does not explain how to deal with the insulation between the bare battery cell and the shell. There are currently two commonly used insulation treatment methods on the market. One is to directly fit the bare battery cell with adhesive tape, and its disadvantage is that it cannot be reworked. The other is to use an insulating film and a top cover plastic part for hot melting. The hot melting of the insulating film and the top cover plastic part is divided into two processes. One method is to wrap the insulating film from top to bottom. The disadvantage is that the shell cover welding is easy to burn the insulating film; the other method is to wrap the insulating sheet from bottom to top. The disadvantage is that the large surface of the battery cell is not hot-melted or the hot melting is not enough at many points and it is easy to be misplaced or even loose, resulting in a high degree of poor shell cover welding.

[0004] To this end, a high-power battery is designed, whose insulating parts can be well fixed between the bare battery cell and the shell, thereby improving the manufacturing efficiency. Utility Model Content

[0005] The technical problem to be solved by the utility model is that the insulation treatment method for hot melting of the insulation film and the top cover plastic part on the market is prone to poor battery cells. In view of the problems existing in the prior art, a new square power battery is provided.

[0006] The purpose and effect of the utility model are achieved by the following specific technical means: A new square power battery, comprising:

[0007] An outer shell, in which a bare cell is installed, a pole ear is provided on the side of the bare cell, and an insulating film is wrapped outside the bare cell, and a hot melting point is provided on the top surface of the insulating film;

[0008] The top cover is welded to the upper opening of the outer shell, a lower plastic is installed below the top cover, and a hot melting position is arranged on the bottom surface of the lower plastic at a position corresponding to the hot melting point.

[0009] A further preferred solution is that a blue film is provided on the inner wall of the outer shell, and the blue film is located outside the insulating film.

[0010] A further preferred solution: the heat-melting position includes a first heat-melting portion, a second heat-melting portion and a third heat-melting portion.

[0011] A further preferred solution is that pole assemblies are provided at both ends of the top cover, and the bottom of the pole assembly passes through the top cover and the lower plastic, and an L-shaped connecting piece is welded at the end of the pole assembly.

[0012] A further preferred solution: the connecting pieces are located at both ends of the bare battery cell and are welded to the tabs.

[0013] A further preferred solution is that the first hot melt portion and the third hot melt portion are respectively located at the inner ends of the two connecting pieces, and the second hot melt portion is located between the first hot melt portion and the third hot melt portion, and the second hot melt portion is centered on the lower plastic bottom surface.

[0014] A further preferred solution is that the ratio of the distance between the first hot-melt portion and the second hot-melt portion to the distance between the second hot-melt portion and the third hot-melt portion is between 0.1-1.

[0015] Beneficial effects of the utility model:

[0016] In the initial state, the top cover is not welded to the outer shell, the connecting piece is welded to the pole ear, and then the bare battery cell is placed in the outer shell, the width of the second hot melt portion is 0.1cm-4cm, because the width of the second hot melt portion is larger, the second hot melt portion corresponds to two sets of hot melting points, and the two sets of hot melting points can be welded at the positions near the four corners of the second hot melt portion, and the first hot melt portion and the third hot melt portion are respectively located on the inner sides of the two poles, which does not affect the assembly of the poles and the connecting piece. Therefore, the connection between the lower plastic and the insulating film can be guaranteed by welding the first hot melt portion, the third hot melt portion and the hot melting point, so as to ensure that the bare battery cell is not damaged and the normal connection between the pole, the connecting piece and the pole ear is not affected. The firmness of the connection between the lower plastic and the insulating film is improved to avoid the poor welding of the shell cover caused by the misalignment or even looseness of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the insulating film structure of the utility model;

[0020] Figure 3 This is a schematic diagram of the disassembly of the top cover and the lower plastic structure of the utility model;

[0021] Figure 4 This is a front plan view of the lower plastic structure of the utility model;

[0022] Figure 5 This is a bottom view of the lower plastic structure of the utility model.

[0023] Figure 1-Figure 5 Middle: outer shell (1), bare battery cell (2), insulating film (201), hot melt point (202), blue film (3), tab (4), top cover (5), lower plastic (6), connecting piece (7), first hot melt portion (8), second hot melt portion (9), and third hot melt portion (10). DETAILED DESCRIPTION

[0024] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. The following embodiments are only examples for implementing the utility model. It must be pointed out that the disclosed embodiments do not limit the scope of the utility model. On the contrary, changes and modifications made without departing from the scope of the utility model are all within the scope of patent protection of the utility model.

[0025] See also Figure 1-Figure 5 , a new type of square power battery, including:

[0026] The outer shell 1 has a bare cell 2 installed inside. The bare cell 2 is a wound or laminated type. A pole ear 4 is provided on the side of the bare cell 2 for connecting electricity. The bare cell 2 is wrapped with an insulating film 201. The insulating film 201 can play a shaping role to prevent the bare cell 2 from being loose. The top surface of the insulating film 201 is provided with a hot melting point 202;

[0027] The top cover 5 is welded to the upper opening of the outer shell 1. The top cover 5 is provided with pole assemblies at both ends, and the bottom of the pole assembly passes through the top cover 5 and the lower plastic 6, and an L-shaped connecting piece 7 (such as Figure 3 As shown in the figure, the pole is composed of a gasket, a sealing ring, an upper plastic and a pole body which is assembled from bottom to top. The pole body is connected to the connecting piece 7. In the initial state, the top cover 5 is not welded to the outer shell 1. The top cover 5 can be placed on the bare cell 2 first, and then the connecting piece 7 is adjusted to be close to the pole ear 4, and the connecting piece 7 is welded to the pole ear 4, and then the bare cell 2 is placed in the outer shell 1;

[0028] Furthermore, a blue film 3 is provided on the inner wall of the outer shell 1, and the blue film 3 is located outside the insulating film 201, and the blue film 3 can protect the bare battery cell 2 from being scratched by the outer shell 1;

[0029] Preferably, the hot melting point 202 is set to four groups (such as Figure 2As shown), and each left and right two corresponding hot melt points 202 form a group, a lower plastic 6 is installed under the top cover 5, and a hot melt position is provided at the bottom surface of the lower plastic 6 corresponding to the hot melt point 202, and the hot melt position includes a first hot melt portion 8, a second hot melt portion 9 and a third hot melt portion 10, the first hot melt portion 8 and the third hot melt portion 10 are respectively located at the inner ends of the two connecting pieces 7, and the second hot melt portion 9 is located between the first hot melt portion 8 and the third hot melt portion 10, preferably, the second hot melt portion 9 is arranged at the center of the bottom surface of the lower plastic 6, and the width of the second hot melt portion 9 is 0.1cm-4cm. Because the width of the second hot melt portion 9 is larger, the second hot melt portion 9 corresponds to two groups of hot melt points 202, and the two groups of hot melt points 202 can be welded at the positions near the four corners of the second hot melt portion 9, and the first hot melt portion 9 is welded at the positions near the four corners of the second hot melt portion 9. The melting part 8 and the third hot-melt part 10 are respectively located on the inner sides of the two poles, and do not affect the assembly of the pole and the connecting piece 7. Therefore, the connection between the lower plastic 6 and the insulating film 201 can be ensured by welding the first hot-melt part 8, the third hot-melt part 10 and the hot-melt point 202. The ratio of the distance between the first hot-melt part 8 and the second hot-melt part 9 to the distance between the second hot-melt part 9 and the third hot-melt part 10 is between 0.1-1. Those skilled in the art can design the spacing between the three hot-melt parts within a reasonable range according to different structural dimensions, thereby ensuring that the bare battery cell 2 is not damaged and the normal connection between the pole, the connecting piece 7 and the pole ear 4 is not affected. The firmness of the connection between the lower plastic 6 and the insulating film 201 is improved to avoid the poor welding of the shell cover caused by the misalignment or even looseness of the battery cell.

Claims

1. A new type of square power battery, characterized in that: include: An outer shell, in which a bare cell is installed, a pole ear is provided on the side of the bare cell, and an insulating film is wrapped outside the bare cell, and a hot melting point is provided on the top surface of the insulating film; The top cover is welded to the upper opening of the outer shell, a lower plastic is installed below the top cover, and a hot melting position is arranged on the bottom surface of the lower plastic at a position corresponding to the hot melting point.

2. A novel square power battery according to claim 1, characterized in that: The inner wall of the outer shell is provided with a blue film, and the blue film is located outside the insulating film.

3. A novel square power battery according to claim 1, characterized in that: The heat-melting portion includes a first heat-melting portion, a second heat-melting portion and a third heat-melting portion.

4. A novel square power battery according to claim 3, characterized in that: The top cover is provided with pole assemblies at both ends, and the bottom of the pole assembly passes through the top cover and the lower plastic, and an L-shaped connecting piece is welded at the end of the pole assembly.

5. A novel square power battery according to claim 4, characterized in that: The connecting pieces are located at both ends of the bare battery core and are welded to the tabs.

6. A novel square power battery according to claim 4, characterized in that: The first hot-melt portion and the third hot-melt portion are respectively located at the inner ends of the two connecting pieces, and the second hot-melt portion is located between the first hot-melt portion and the third hot-melt portion, and the second hot-melt portion is located in the center of the lower plastic bottom surface.

7. A novel square power battery according to claim 6, characterized in that: The ratio of the distance between the first heat-melting portion and the second heat-melting portion to the distance between the second heat-melting portion and the third heat-melting portion is between 0.1 and 1.

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