Long-cycle-life lithium metal battery module for aircraft

Abstract

The lithium metal battery module comprises a shell and a battery cell group arranged in the shell, the battery cell group comprises a plurality of battery cell bodies arranged in the left-right direction, an elastic buffer piece is arranged between at least one side of the battery cell group in the left-right direction and the shell, and the elastic buffer piece is arranged between the shell and the battery cell body in the left-right direction. The elastic buffer piece comprises at least two connecting plates, every two adjacent connecting plates are connected through an arc-shaped plate, the connecting plates are connected with the inner side face of the shell, and the outwards-protruding cambered surface of each arc-shaped plate abuts against the side face of the corresponding battery cell set; the battery module has the advantages of being good in expansive force absorption capacity, capable of effectively reducing damage of expansive force to the battery cell groups in the module, and beneficial to prolonging the service life of the module.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium metal batteries, and particularly relates to a lithium metal battery module with a long cycle life for an aircraft. Background Art

[0002] Lithium metal batteries have a higher energy density than conventional lithium-ion batteries. However, due to the strong reactivity of metallic lithium, the expansion and contraction of lithium metal batteries during charge and discharge are more severe. During the charging process, a large expansion force is generated in the lithium metal battery, which has an adverse effect on the cycle and safety performance of the lithium metal battery. In order to effectively reduce the damage of the expansion force to the module battery, in the module design, buffer materials are usually placed between the batteries, and the force-deformation characteristics of the buffer materials are used to absorb the expansion force generated during the battery charging process, thereby avoiding the damage caused by the large expansion force to the battery. For example, in the patent CN217047831U "Buffer Flame Retardant Material Structure and Battery Pack", buffer flame retardant materials are placed between the internal batteries of the module to relieve the battery expansion force. However, this method has certain drawbacks. Since the absorption capacity of the buffer material for the expansion force is limited, once the expansion force inside the module battery exceeds the absorption capacity of the buffer material, the large expansion force will still damage the battery and damage the performance of the single cell, thereby affecting the cycle and safety performance of the entire module. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a lithium metal battery module with a long cycle life for an aircraft, which has good expansion force absorption ability, can effectively reduce the damage caused by the expansion force to the internal cell group of the module, and is beneficial to extending the service life of the module.

[0004] The technical solution adopted by the utility model to solve the above technical problems is as follows: A lithium metal battery module with a long cycle life for an aircraft, including a housing and a cell group arranged in the housing. The cell group includes a plurality of cell bodies arranged in the left-right direction. At least one side of the cell group in the left-right direction is provided with an elastic buffer member between it and the housing. The elastic buffer member includes at least two connecting plates, and adjacent two of the connecting plates are connected by an arc-shaped plate. The connecting plate is connected to the inner side surface of the housing, and the convex arc surface of the arc-shaped plate abuts against the side surface of the cell group.

[0005] Preferably, the connecting plate and the housing are fixedly connected by welding.

[0006] Preferably, the connecting plates are equidistantly distributed in the front-back direction.

[0007] Preferably, the width of the arc-shaped plate in the left-right direction is 0.5 mm - 2 mm.

[0008] Preferably, the arc-shaped plate is an elastic stainless steel plate.

[0009] Preferably, a displacement sensor and a pressure sensor are arranged on the housing. The displacement sensor is used to detect the expansion amount of the housing during the charge and discharge cycle, and the pressure sensor is used to detect the expansion force of the housing during the charge and discharge cycle.

[0010] Preferably, a buffer layer is arranged between two adjacent battery cell bodies.

[0011] Preferably, the buffer layer is one of EVA, silica gel foam, polyurethane foam, ECR foam, CR foam, and PE foam.

[0012] Preferably, the thickness of the buffer layer is 0.5 mm - 2.5 mm.

[0013] Preferably, at least one positioning post is fixedly arranged on the connecting plate, and a plurality of positioning holes corresponding to the positioning posts one by one are arranged on the side surface of the housing. The positioning post is inserted into the corresponding positioning hole and fixedly welded to the positioning hole.

[0014] Compared with the prior art, the advantages of the present utility model are as follows:

[0015] 1. By arranging an elastic buffer between the battery cell group and the housing, the battery cell group has a good expansion space in the housing. When the battery cell group expands during the charge and discharge process, the elastic buffer can effectively reduce the damage caused by the expansion force to the battery cell group inside the housing, which is beneficial to extending the service life of the module;

[0016] 2. The arrangement of the elastic buffer helps to reduce the assembly difficulty between the battery cell group and the housing and improve the assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present utility model Figure 1 ;

[0018] Figure 2 is a schematic structural diagram of the elastic buffer in the present utility model Figure 1 ;

[0019] Figure 3 is a schematic side structural diagram of the elastic buffer in the present utility model;

[0020] Figure 4 is a schematic structural diagram of the present utility model Figure 2 ;

[0021] Figure 5 is a schematic structural diagram of the elastic buffer in the present utility model Figure 2 .

[0022] In the figure: 1. Housing; 11. Positioning hole; 2. Battery cell group; 21. Battery cell body; 22. Buffer layer; 3. Elastic buffer; 31. Connection plate; 32. Arc plate; 33. Positioning post; 4. Displacement sensor; 5. Pressure sensor. Specific embodiments

[0023] The following further describes the present utility model in detail with reference to the embodiments of the attached drawings.

[0024] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0025] Embodiment 1: As Figures 1 to 3 shown, a lithium metal battery module with a long cycle life for an aircraft includes a housing 1 and a battery cell group 2 arranged in the housing 1. The battery cell group 2 includes a plurality of battery cell bodies 21 arranged in the left-right direction. An elastic buffer 3 is provided between at least one side of the battery cell group 2 in the left-right direction and the housing 1. The elastic buffer 3 includes at least two connection plates 31. Adjacent connection plates 31 are connected by an arc plate 32. The connection plate 31 is connected to the inner side surface of the housing 1. The outer convex arc surface of the arc plate 32 abuts against the side surface of the battery cell group 2. Preferably, elastic buffers 3 are respectively provided on the left and right sides of the battery cell group 2.

[0026] In this embodiment, the connection plate 31 is fixedly welded to the housing 1.

[0027] In this embodiment, the connection plates 31 are evenly distributed in the front-rear direction.

[0028] In this embodiment, the width L of the arc plate 32 in the left-right direction is 0.5 mm - 2 mm.

[0029] In this embodiment, the arc plate 32 is an elastic stainless steel plate.

[0030] In this embodiment, a displacement sensor 4 and a pressure sensor 5 are provided on the housing 1. The displacement sensor 4 is used to detect the expansion amount of the housing 1 during the charge and discharge cycle, and the pressure sensor 5 is used to detect the expansion force of the housing 1 during the charge and discharge cycle, so as to monitor in real time whether the expansion amount and the expansion force reach the safety warning line of the module, which can play a warning role and has good safety.

[0031] Embodiment 2: As Figures 1 to 3As shown, the rest of the parts are the same as those in the first embodiment, except that a buffer layer 22 is provided between two adjacent battery cell bodies 21, so that the battery cell group 2 has a larger expansion space in the housing 1, which helps to expand the application scenarios.

[0032] In this embodiment, the buffer layer 22 is one of EVA, silicone foam, polyurethane foam, ECR foam, CR foam, and PE foam.

[0033] In this embodiment, the thickness of the buffer layer 22 is 0.5 mm-2.5 mm.

[0034] Since the arc plate 32 is arched in design and has a certain bending resistance, when the expansion force of the battery cell body 21 is small and does not exceed the bending resistance of the arc plate 32, the buffer layer 22 mainly realizes the buffering effect. When the expansion force exceeds the bending resistance of the arc plate 32, the arc plate 32 bends and cooperates with the buffer layer 22 to achieve a good buffering effect. When the expansion force exceeds the bending resistance of the arc plate 32, the shell 1 expands and is monitored by the displacement sensor 4. The design of this structure has the function of multi-level protection of the battery cell group 2, so that the battery cell group 2 is subjected to a more balanced force during the charging and discharging process, which helps to further improve the overall cycle performance of the battery module.

[0035] Embodiment 3: Figure 4 and Figure 5 As shown, the rest of the parts are the same as those of the first embodiment, except that at least one positioning column 33 is fixedly provided on the connecting plate 31, and a plurality of positioning holes 11 corresponding to the positioning columns 33 are provided on the side of the housing 1, and the positioning columns 33 are inserted into the corresponding positioning holes 11 and fixed by welding to the positioning holes 11. Preferably, 1-3 positioning columns 33 are provided on each connecting plate 31.

[0036] By providing the positioning column 33 and the positioning hole 11, it is convenient for the staff to quickly align and assemble the elastic buffer 3 and the shell 1, and the connecting plate 31 and the shell 1 can be welded and fixed through the positioning hole 11, which facilitates the welding operation and is conducive to improving the processing efficiency.

[0037] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. It is obvious that the implementation of the utility model is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A lithium metal battery module with a long cycle life for an aircraft, comprising a housing (1) and an electric cell group (2) arranged inside the housing (1), the electric cell group (2) including a plurality of electric cell bodies (21) arranged in the left-right direction, characterized in that An elastic buffer member (3) is provided between at least one side of the battery cell group (2) in the left-right direction and the housing (1). The elastic buffer member (3) includes at least two connecting plates (31), and adjacent two of the connecting plates (31) are connected by an arc-shaped plate (32). The connecting plate (31) is connected to the inner side surface of the housing (1), and the outer convex arc surface of the arc-shaped plate (32) abuts against the side surface of the battery cell group (2).

2. The lithium metal battery module with long cycle life for an aircraft according to claim 1, characterized in that The connecting plate (31) is fixedly welded to the housing (1).

3. The lithium metal battery module with long cycle life for an aircraft according to claim 1, wherein The connecting plates (31) are equally spaced in the front-back direction.

4. The lithium metal battery module with long cycle life for an aircraft according to claim 1, wherein The width of the arc-shaped plate (32) in the left-right direction is 0.5 mm - 2 mm.

5. A lithium metal battery module with a long cycle life for an aircraft, characterized in that The arc-shaped plate (32) is an elastic stainless steel plate.

6. The lithium metal battery module with long cycle life for an aircraft according to claim 1, wherein A displacement sensor (4) and a pressure sensor (5) are provided on the housing (1). The displacement sensor (4) is used to detect the expansion amount of the housing (1) during the charge and discharge cycle, and the pressure sensor (5) is used to detect the expansion force of the housing (1) during the charge and discharge cycle.

7. The lithium metal battery module with long cycle life for an aircraft according to claim 1, wherein A buffer layer (22) is provided between adjacent two of the battery cell bodies (21).

8. A lithium metal battery module with a long cycle life for an aircraft, characterized in that The buffer layer (22) is one of EVA, silica gel foam, polyurethane foam, ECR foam, CR foam, and PE foam.

9. The lithium metal battery module with long cycle life for an aircraft according to claim 7, wherein The thickness of the buffer layer (22) is 0.5 mm - 2.5 mm.

10. The lithium metal battery module with long cycle life for an aircraft according to claim 2, wherein At least one positioning post (33) is fixedly provided on the connecting plate (31), and a plurality of positioning holes (11) corresponding to the positioning posts (33) one by one are provided on the side surface of the housing (1). The positioning post (33) is inserted into the corresponding positioning hole (11) and fixedly welded to the positioning hole (11).

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