Battery shell and ion battery

Abstract

The battery shell comprises an outer shell body and a pre-tightening assembly, the pre-tightening assembly comprises an elastic element and a supporting plate, the supporting plate is located in the outer shell body, one side face of the supporting plate is connected with the inner wall of the outer shell body through the elastic element, and the other side face of the supporting plate is connected with the inner wall of the outer shell body through the elastic element. And the other side surface of the pre-tightening device is in contact with the naked battery core in the outer shell and is used for providing pre-tightening force for the naked battery core. The battery shell can generate pre-tightening force on the naked battery cell, so that the swelling amount of the naked battery cell is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ion batteries, in particular to a battery shell and an ion battery comprising the battery shell. Background Art

[0002] Lithium-ion batteries have the advantages of high energy density, high average output voltage, low self-discharge, no memory effect, excellent cycle performance, high charge and discharge efficiency, etc. At present, they are developing rapidly in the fields of mobile digital products, electric vehicles, large-scale energy storage, etc., occupying a large market share.

[0003] However, during the use of lithium-ion batteries, as the number of uses increases, the internal electrodes will expand and the electrolyte will gradually be consumed. The expansion of the internal electrodes will reduce the service life of the battery. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a battery shell and an ion battery including the battery shell in view of the above-mentioned deficiencies in the prior art, wherein the battery shell can generate a pre-tightening force on a bare battery cell, thereby effectively reducing the expansion amount of the bare battery cell.

[0005] In order to solve the above problems, the utility model adopts the following technical solutions:

[0006] A battery casing comprises an outer casing and a pre-tightening assembly, wherein the pre-tightening assembly comprises an elastic element and a support plate, wherein the support plate is located inside the outer casing, one side of the support plate is connected to the inner wall of the outer casing through the elastic element, and the other side of the support plate is in contact with a bare battery cell inside the outer casing, so as to provide a pre-tightening force for the bare battery cell.

[0007] Preferably, the ratio of the distance between the support plate and the outer shell to the total thickness of the outer shell is in the range of 3-15%.

[0008] Preferably, a plurality of the elastic elements are provided, and the plurality of elastic elements are arranged on the support plate at intervals.

[0009] Preferably, the elastic element is one of a leaf spring, a coil spring, a torsion bar spring, a rubber spring, a gas spring, an air spring, an oil-gas spring, a coil spring, a coil spring, a compression spring, and a leaf spring.

[0010] Preferably, the support plate is made of one or more of aluminum alloy, steel, nickel, nickel alloy, copper, copper alloy, and insulating non-metallic material.

[0011] Preferably, the outer shell is made of one of aluminum, aluminum alloy, iron, iron alloy, nickel, nickel alloy, copper, copper alloy and plastic.

[0012] The utility model also provides an ion battery, comprising a bare cell and the battery shell, wherein the bare cell is installed inside the shell.

[0013] A support plate is provided inside the battery shell in the utility model, and the support plate is connected to the inner wall of the shell body through an elastic element. When the battery is formed, the pre-tightening force provided by the support plate makes the contact between the pole pieces inside the bare battery cell tighter, thereby improving various performances of the battery. On the other hand, when the bare battery cell inside the battery expands during subsequent use of the battery, the elastic element is compressed to provide a reverse elastic force, thereby reducing the expansion amount of the bare battery cell and thus increasing the service life of the battery. At the same time, the gap between the support plate and the shell body increases the liquid retention capacity of the battery and improves the cycle life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the battery housing in Embodiment 1 of the present utility model;

[0015] Figure 2 It is a schematic diagram of the structure of the ion battery in Example 2 of the utility model.

[0016] In the figure: 100 - outer shell, 110 - support plate, 120 - elastic element, 200 - bare battery cell. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the utility model.

[0018] In the description of the present invention, it should be noted that the directions or positional relationships indicated by “upper” and the like are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience and simplification of the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as a limitation on the present invention.

[0019] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connection", "setting", "installation", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0021] The utility model provides a battery shell, comprising an outer shell and a pre-tightening assembly, wherein the pre-tightening assembly comprises an elastic element and a support plate, wherein the support plate is located inside the outer shell, one side of the support plate is connected to the inner wall of the outer shell through the elastic element, and the other side of the support plate is in contact with a bare battery cell inside the outer shell, so as to provide a pre-tightening force for the bare battery cell.

[0022] The utility model also provides an ion battery, comprising a bare cell and the battery shell, wherein the bare cell is installed inside the shell.

[0023] Example 1

[0024] like Figure 1 As shown, this embodiment discloses a battery shell, including an outer shell 100 and a pre-tightening assembly, the pre-tightening assembly including an elastic element 120 and a support plate 110, the support plate 110 is located inside the outer shell 100, one side of the support plate 110 is connected to the inner wall of the outer shell 100 through the elastic element 120, and the other side is in contact with the bare cell 200 inside the outer shell 100, and is used to provide a pre-tightening force for the bare cell 200. Specifically, during the manufacturing process of the ion battery, a formation process is required, and the bare cell inside undergoes a preliminary expansion and is squeezed against the support plate. The pre-tightening force provided by the elastic element 120 and the support plate 110 makes the pole piece inside the bare cell 200 contact more closely, thereby improving various performances of the battery. Secondly, during the subsequent use of the battery, the bare cell 200 will further expand, and the expanded bare cell 200 will further squeeze the elastic element 120. The reverse elastic force of the elastic element 120 will then act on the bare cell through the support plate 110, thereby reducing the expansion of the bare cell 200 and thereby increasing the service life of the battery.

[0025] like Figure 1 As shown, the outer shell 100 is a closed shell structure in the shape of a rectangular parallelepiped, the support plate 110 is a planar plate-like structure, and the support plate 110 is arranged near the inner wall of the outer shell 100. Specifically, the ratio of the distance between the support plate 110 and the inner wall of the outer shell 100 to the total thickness of the outer shell 100 (battery) is in the range of 3-15%. For example, when the total thickness of the outer shell 100 (battery) is 200 mm, the distance between the support plate 110 and the inner wall of the outer shell 100 can be set to 20 mm.

[0026] It is worth noting that the support plate 110 in this embodiment can be provided in plurality, and the plurality of support plates 110 are respectively connected to different inner walls of the outer shell 100 through the elastic element 120, so as to pre-tighten the bare battery cell 200 in multiple directions. Figure 2 As shown, in this embodiment, only a support plate 110 is provided on the inner wall of the upper surface of the outer shell 100, so as to pre-tighten the bare cell 200 from one direction. Generally speaking, only one support plate 110 is required to pre-tighten the bare cell 200.

[0027] In this embodiment, a plurality of elastic elements 120 are provided, and the plurality of elastic elements 120 are arranged at intervals on the support plate 110. Figure 1 As shown, specifically, there are three groups of elastic elements 120, which are distributed along the length direction of the support plate 110, one group is located in the middle of the support plate 110, and the other two groups are respectively located at the two ends of the support plate 110. In this embodiment, the elastic elements 120 can be installed tilted or vertically.

[0028] Optionally, the elastic element 120 is one of a leaf spring, a coil spring, a torsion bar spring, a rubber spring, a gas spring, an air spring, an oil-gas spring, a coil spring, a coil spring, a compression spring, and a leaf spring. Preferably, the elastic element 120 is a leaf spring or a conical coil spring.

[0029] In this embodiment, the material of the support plate 110 is a metal or non-metallic flat plate with a certain rigidity; specifically, the material can be a composite material composed of one or more of aluminum alloy, steel, nickel, nickel alloy, copper, copper alloy, and insulating non-metallic materials.

[0030] In this embodiment, the material of the outer shell 100 needs to have a certain rigidity and be able to isolate moisture in the air. Specifically, the material can be one of aluminum, aluminum alloy, iron, iron alloy, nickel, nickel alloy, copper, copper alloy, and plastic.

[0031] Furthermore, when the shell is made of aluminum alloy, the support plate 110 is preferably an aluminum alloy plate with an insulating layer on the surface; when the shell is made of steel, the support plate 110 is preferably a steel plate with an insulating layer on the surface.

[0032] The working principle of the battery housing in this embodiment is as follows:

[0033] When assembling the battery, the distance between the support plate 110 and the shell 100 can be compressed, and the bare cell 200 can be installed inside the shell. The loosened support plate 110 will then provide a pre-tightening force to the bare cell 200. During battery formation and capacity division, the pressing force of the support plate 110 on the bare cell 200 makes the contact between the internal pole pieces of the bare cell 200 closer, thereby improving the various performances of the battery.

[0034] In the present embodiment, a support plate 110 is provided inside the battery casing, and the support plate 110 is connected to the inner wall of the outer casing 100 through an elastic element 120. When the battery is formed, the pre-tightening force provided by the support plate 110 makes the contact between the pole pieces inside the bare battery cell 200 closer, thereby improving the various performances of the battery. On the other hand, when the bare battery cell 200 inside the battery expands during subsequent use of the battery, the elastic element 120 is compressed to provide a reverse elastic force, thereby reducing the expansion of the bare battery cell 200 and thereby increasing the service life of the battery.

[0035] In addition, the battery housing does not require an external pre-tightening device, which reduces the process cost of the overall module, and the overall external expansion of the battery is small, thereby reducing the risk of failure of the tab welding and other parts and reducing the cost of the tab connector. The battery housing can also be used alone when the overall module cannot provide pre-tightening force.

[0036] In addition, the elastic element 120 occupies a small space, and the space between the support plate 110 and the battery housing can be used to store electrolyte, thereby increasing the electrolyte retention of the battery cell and improving the cycle life of the battery cell.

[0037] Example 2

[0038] This embodiment discloses an ion battery, including a bare cell 200 and the battery casing in Embodiment 1, wherein the bare cell 200 is installed inside the casing 100 .

[0039] like Figure 2 As shown, in this embodiment, the ion battery is a lithium ion battery or a sodium ion battery, and the electrolyte inside the outer shell 100 fills the area between the outer shell 100 and the support plate 110 and around the bare cell 200. During the installation and manufacturing process of the ion battery, the elastic element 120 and the support plate 110 are in contact with the bare cell 200, providing a pre-tightening force for the bare cell 200, so that the contact between the pole pieces inside the bare cell 200 is tighter; during the subsequent use of the battery, the bare cell 200 continues to expand and further squeezes the support plate 110, and the support plate 110 limits the excessive expansion of the bare cell 200 through the reverse force of the elastic element 120, thereby reducing the expansion of the bare cell 200, thereby improving the service life of the ion battery.

[0040] The battery casing of the ion battery in this embodiment can provide a pre-tightening force for the bare battery cell and provide a reverse force when the bare battery cell expands, thereby reducing the expansion amount of the bare battery cell 200 and further increasing the service life of the ion battery.

[0041] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A battery casing, characterized in that: It comprises an outer shell (100), a pre-tightening assembly, The pre-tightening assembly comprises an elastic element (120) and a support plate (110), wherein the support plate (110) is located inside the outer shell (100), one side of the support plate (110) is connected to the inner wall of the outer shell (100) through the elastic element (120), and the other side is in contact with the bare battery cell (200) inside the outer shell (100), so as to provide a pre-tightening force for the bare battery cell (200).

2. The battery housing according to claim 1, characterized in that: The ratio of the distance between the support plate (110) and the outer shell (100) to the total thickness of the outer shell (100) is in the range of 3-15%.

3. The battery housing according to claim 2, characterized in that: A plurality of the elastic elements (120) are provided, and the plurality of elastic elements (120) are arranged at intervals on the support plate (110).

4. The battery casing according to any one of claims 1 to 3, characterized in that: The elastic element (120) is one of a steel leaf spring, a spiral spring, a torsion bar spring, a rubber spring, a gas spring, an air spring, an oil-gas spring, a coil spring, a coil spring, a compression spring, and a steel leaf spring.

5. The battery housing according to any one of claims 1 to 3, characterized in that: The support plate (110) is made of a material selected from the group consisting of aluminum alloy, steel, nickel, nickel alloy, copper, copper alloy, and insulating non-metallic material.

6. The battery casing according to any one of claims 1 to 3, characterized in that: The outer shell (100) is made of a material selected from the group consisting of aluminum, aluminum alloy, iron, iron alloy, nickel, nickel alloy, copper, copper alloy, and plastic.

7. An ion battery, comprising a bare cell (200), characterized in that: It also comprises the battery casing according to any one of claims 1 to 6, wherein the bare battery cell (200) is installed inside the casing (100).

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