CN202495544U - Power battery - Google Patents

Abstract

The utility model belongs to the technical field of power batteries, and in particular, relates to a power battery with an arc-shaped structure, including a battery cell, a shell for accommodating the battery cell, an electrolyte poured into the shell, and a battery cover sealed and mounted on the shell, wherein the front end of the battery cell is provided with a positive pole ear and a negative pole ear, and the battery cell, the shell and the battery cover are all arc-shaped. Compared with the prior art, the shell of the utility model can withstand greater air pressure without swelling and deformation compared with square batteries; compared with cylindrical batteries, the battery pack assembled with arc-shaped batteries has larger available space, so the power battery of the utility model can reduce battery deformation and take into account space utilization. In addition, the utility model also discloses a power battery pack including the power battery.

Description

a power battery

technical field

The utility model belongs to the technical field of power batteries, in particular to an arc-shaped power battery and a power battery pack containing the power battery.

Background technique

With the development of modern society and the enhancement of people's awareness of environmental protection, more and more devices choose to use rechargeable secondary batteries as power sources, such as mobile phones, laptop computers, power tools, electric vehicles and energy storage power stations, etc. The application and development of rechargeable secondary batteries provide a broad space.

Electric vehicles and energy storage power stations generally need to use large-capacity power batteries as power sources. In addition to high capacity, these power batteries should also have good safety in order to meet the standards of use and meet people's needs.

Existing power batteries generally adopt a square structure to improve the space utilization of the battery pack. However, during the charging and discharging process of the lithium-ion power battery, gas will be generated inside the battery cell, which will increase the internal pressure of the battery, and the square battery shell will bulge in the middle of the battery shell due to uneven force around it. However, due to the size and space of our battery packs, there is only a relatively small distance between the batteries. In this way, during the working process of the battery, due to gas generation and expansion of the battery, there is a risk of contact between the two batteries, resulting in a greater potential safety hazard.

In order to solve the bulging problem of the battery case, some power batteries adopt a cylindrical structure, because the cylinder is subjected to the same pressure inside and the surrounding force is uniform and the deformation is small. However, when cylindrical batteries are connected in parallel or in series to form a battery pack, the space utilization is very low.

In view of this, it is indeed necessary to provide a power battery that can reduce battery deformation and take into account space utilization, and a power battery pack including the power battery.

Utility model content

One of the purposes of the present utility model is to provide a power battery capable of reducing the deformation of the battery and taking into account the space utilization rate in view of the deficiencies of the prior art.

In order to achieve the above object, the technical solution adopted by the utility model is:

A power battery, comprising a battery cell, a casing for containing the battery cell, an electrolyte poured into the casing, and a battery top cover sealed and mounted on the casing, the front end of the battery cell is provided with a positive pole lug And the negative electrode tab, the battery core, the casing and the battery top cover are all arc-shaped. Wherein, the casing and the battery top cover are made of materials such as aluminum or stainless steel.

According to the principle of mechanics, if any object is to be deformed, a force must first be applied to it. If the force is small and the object is strong enough, the object will not deform or deform slightly. In addition, stainless steel or aluminum plates have certain tensile properties. When they are stretched to a certain size, they need a lot of force to pull them to a small deformation, and they need a large enough force to break them.

The utility model utilizes the above two principles. Because the curved battery has a concave surface of the shell, the shell itself has been pre-stretched to a certain size, so it needs a lot of force to deform; and the shell of the curved battery The convex surface has much greater strength than the flat surface and can withstand relatively large forces. Although the lithium-ion power battery will produce gas during the working process, resulting in an increase in the internal air pressure of the battery, but the air pressure will not be very large under normal working conditions. Therefore, according to batteries of different sizes and capacities, the arc-shaped battery case can well solve the problem of case bulging and deformation by selecting different radians and case thicknesses.

In addition, the curved batteries can also be arranged in a row in a relatively compact manner, and the space utilization rate is relatively large.

Compared with the prior art, the shell of the utility model can withstand greater air pressure without swelling and deformation compared with the square battery; compared with the cylindrical battery, the battery pack assembled from the arc-shaped battery can use more space.

As an improvement of the power battery of the utility model, the radians of the battery core, the casing and the battery top cover are equal.

As an improvement of the power battery of the utility model, the radian of the battery core, the casing and the battery top cover is 0-2π.

As an improvement of the power battery of the utility model, the radian of the battery cell, the casing and the battery top cover is 0-1.5π.

As an improvement of the power battery of the utility model, the radian of the battery cell, the casing and the battery top cover is 0.15π. A power battery with such a radian can best balance the effects of reducing battery deformation and increasing space utilization.

As an improvement of the power battery of the utility model, the battery top cover is provided with a positive pole, a negative pole and a liquid injection hole.

As an improvement of the power battery of the utility model, the positive pole tab is electrically connected to the positive pole column, and the negative pole tab is electrically connected to the negative pole pole.

As an improvement of the power battery of the utility model, the battery top cover is connected to the casing by laser welding.

Another object of the present utility model is to provide a power battery pack, which includes at least two power batteries and a battery connection piece for connecting the power batteries, and the power battery is the power battery described in the above paragraph.

Compared with the prior art, when the arc-shaped power battery of the present utility model is assembled into a battery pack, there is only a small assembly gap between the batteries, and there is no need to consider the space for the battery to be flattened and deformed, and the battery pack assembly shell uses more space. big.

Description of drawings

Fig. 1 is a three-dimensional structural schematic diagram of a power battery of the present invention;

Fig. 2 is an explosion diagram of the utility model power battery;

Fig. 3 is a schematic diagram of the three-dimensional structure of the power battery pack of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Figures 1 and 2, the power battery of the present utility model includes a battery cell 1, a housing 2 for accommodating the battery core 1, an electrolyte poured into the housing 2, and a battery sealed and installed in the housing 2. On the top cover 3 of the battery, the front end of the battery cell 1 is provided with a positive pole tab 11 and a negative pole tab 12, and the battery cell 1, the casing 2 and the battery top cover 3 are all arc-shaped. Wherein, both the housing 2 and the battery top cover 3 are made of aluminum or stainless steel.

Wherein, the radians of the cell 1, the casing 2 and the battery top cover 3 are equal, and the radians of the cell 1, the casing 2 and the battery top cover 3 are 0-2π, preferably 0-1.5π, more preferably is 0.15π.

The battery top cover 3 is provided with a positive pole 31 , a negative pole 32 and a liquid injection hole 33 .

The positive pole tab 11 is electrically connected to the positive pole 31 , and the negative pole tab 12 is electrically connected to the negative pole 32 .

The battery top cover 3 is connected to the casing 2 by laser welding.

The assembly process of the utility model power battery is described in detail below in conjunction with Fig. 2:

First, the arc-shaped cell 1 is placed in the arc-shaped casing 2; then, the electrolyte is poured into the arc-shaped casing 2; finally, the top cover 3 is sealed and installed on the top of the arc-shaped casing 2 by laser welding. When in use, one end of the positive pole 31 and the negative pole 32 are electrically connected to the arc-shaped cell 1 , and the other end is connected to an external circuit.

Different from the prior art, the appearance of the power battery of the utility model is arc-shaped, and compared with the square battery, its shell can withstand larger air pressure without swelling and deformation; big.

As shown in FIG. 3 , a power battery pack includes at least two power batteries and a battery connection piece 4 for connecting the power batteries. The power battery includes a battery cell 1 and a housing for accommodating the battery cell 1 2. The electrolyte poured into the casing 2, and the battery top cover 3 sealed and installed on the casing 2, the front end of the battery cell 1 is provided with a positive pole tab 11 and a negative pole tab 12, the battery cell 1. Both the casing 2 and the battery top cover 3 are arc-shaped.

When assembling the power battery obtained above into a battery pack, only a small assembly gap is left between the batteries, and there is no need to consider the space for the battery to be flattened and deformed, and the battery pack can be assembled with a larger space. Moreover, the power battery of the utility model is arc-shaped in shape, has good strength, can withstand large internal air pressure without deformation, prevents the battery from gas-producing and bulging during operation, and improves the safety performance of the battery pack very well.

According to the disclosure and teaching of the above specification, those skilled in the art to which the present utility model belongs can also make appropriate changes and modifications to the above embodiment. Therefore, the utility model is not limited to the specific implementation manners disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present utility model.

Claims (9)

1. A power battery, comprising a battery cell, a casing for containing the battery cell, an electrolyte poured into the casing, and a battery top cover sealed and mounted on the casing, the front end of the battery cell is provided with a positive electrode The pole lug and the negative pole lug are characterized in that: the battery core, the casing and the battery top cover are all arc-shaped. 2. The power battery according to claim 1, characterized in that: the radians of the battery cell, the casing and the battery top cover are equal. 3. The power battery according to claim 2, characterized in that: the radian of the battery cell, the casing and the battery top cover is 0-2π. 4. The power battery according to claim 3, characterized in that: the radian of the battery cell, casing and battery top cover is 0-1.5π. 5. The power battery according to claim 4, characterized in that: the radian of the battery cell, casing and battery top cover is 0.15π. 6. The power battery according to claim 1, characterized in that: the battery top cover is provided with a positive pole, a negative pole and a liquid injection hole. 7 . The power battery according to claim 6 , wherein the positive tab is electrically connected to the positive post, and the negative tab is electrically connected to the negative post. 8. The power battery according to claim 1, wherein the battery top cover is connected to the casing by laser welding. 9. A power battery pack, comprising at least two power batteries and battery connecting pieces for connecting the power batteries, characterized in that the power battery is the power battery according to any one of claims 1 to 8.

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