A battery cell housing structure with reinforced composite aluminum shell

Abstract

This utility model relates to the field of battery cell casing technology, specifically to a battery cell casing structure with a reinforced composite aluminum shell. It includes an aluminum alloy substrate, a protective plate on the right side of the substrate, and a corrosion-resistant plate on the left side of the substrate that adheres to the outer side of the battery cell body. A first reinforcing rib is embedded between the protective plate and the aluminum alloy substrate, and a second reinforcing rib is embedded between the aluminum alloy substrate and the corrosion-resistant plate. By using the aluminum alloy substrate as the core support layer, the left corrosion-resistant plate directly contacts the battery cell body, blocking electrolyte corrosion, while the right protective plate resists external environmental impact. The first and second reinforcing ribs, located on opposite sides of the substrate, form a double composite reinforcement structure, enhancing the overall structural rigidity. This solves the problem of insufficient strength in existing aluminum alloy casings that rely solely on the substrate, while simultaneously achieving corrosion resistance through the corrosion-resistant plate, balancing strength and corrosion resistance, and reducing the risk of casing deformation and perforation.

Description

Technical Field

[0001] This utility model relates to the field of battery cell casing technology, specifically to a battery cell casing structure with a reinforced composite aluminum shell. Background Technology

[0002] In the field of battery technology, the battery cell, as the core component for energy storage and output, has its casing structure performance directly affecting its safety, lifespan, and overall performance. Currently, battery cell casings are mostly made of metal materials, among which aluminum alloys are widely used due to their advantages such as light weight, good conductivity, and moderate cost.

[0003] However, existing aluminum alloy battery cell casings still have many shortcomings in practical use. On the one hand, to meet the protection requirements of the battery cell, the casing needs to have a certain structural strength to resist external impacts, compression, and other external forces. However, simply increasing the strength of the aluminum alloy substrate is insufficient. On the other hand, the battery cell generates heat during charging and discharging, and the internal electrolyte may corrode the casing. Existing casing structures often struggle to balance good corrosion resistance with structural strength, and after long-term use, problems such as casing deformation and corrosion perforation can easily occur, thus affecting the sealing performance and safety stability of the battery cell. Therefore, improvements are necessary. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a battery cell outer shell structure with a reinforced composite aluminum shell to solve the above problems.

[0005] The purpose of this utility model is achieved as follows: a battery cell shell structure with a reinforcing composite aluminum shell includes an aluminum alloy substrate, a protective plate on the right side of the aluminum alloy substrate, a corrosion-resistant plate on the left side of the aluminum alloy substrate that is attached to the outside of the battery cell body, a first reinforcing rib embedded between the protective plate and the aluminum alloy substrate, and a second reinforcing rib embedded between the aluminum alloy substrate and the corrosion-resistant plate.

[0006] Preferably, the first reinforcing rib and the second reinforcing rib have the same shape and structure and both are "J" shaped, and the bend of the first reinforcing rib abuts against the bend of the second reinforcing rib.

[0007] Preferably, the corrosion-resistant plate has several grooves.

[0008] Preferably, the cross-sectional shape of the groove is an isosceles trapezoid.

[0009] Preferably, the outer layer of the protective plate is provided with a TPU elastic layer.

[0010] Preferably, the surface of the TPU elastic layer has several protrusions.

[0011] This utility model has the following beneficial effects:

[0012] 1. The battery cell shell structure with reinforced composite aluminum shell uses an aluminum alloy substrate as the core support layer. The corrosion-resistant plate on the left side directly contacts the battery cell body, blocking electrolyte corrosion. The protective plate on the right side resists external environmental impact. The first and second reinforcing ribs are located on both sides of the substrate to form a double composite reinforcement structure. By combining with the aluminum alloy substrate and the protective / corrosion-resistant plate, the overall structural rigidity is enhanced, solving the problem of insufficient strength of the aluminum alloy shell relying solely on the substrate in the existing technology. At the same time, the corrosion-resistant plate achieves anti-corrosion function, taking into account both strength and corrosion resistance, and reducing the risk of shell deformation and perforation.

[0013] 2. The first and second reinforcing ribs have the same shape and structure, both being "J"-shaped. The bends of the first and second reinforcing ribs abut against each other. The bends of the "J"-shaped structure form mechanical support points that can disperse stress. After the bends of the two reinforcing ribs abut, they form a cooperative support structure similar to bidirectional clamping, transferring and dispersing external impact forces or internal stresses to the aluminum alloy substrate and protective plate or corrosion-resistant plate through the abutment, avoiding local stress concentration. Compared with single-direction or straight reinforcing ribs, the bending design of the "J"-shaped structure enhances the resistance to bending and extrusion. After the two reinforcing ribs abut, they form a cooperative force-bearing system, further improving the overall structure's resistance to deformation and strengthening the protective effect of the outer shell on the battery cell. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a cross-sectional view of the present invention;

[0017] The labels in the attached diagram are:

[0018] 1. Aluminum alloy substrate; 2. Protective plate; 3. Corrosion resistant plate; 4. Battery cell body; 5. First reinforcing rib; 6. Second reinforcing rib; 7. Groove; 8. TPU elastic layer; 9. Protrusion. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the technical solutions in the specific embodiments of this utility model are clearly and completely described below to further illustrate this utility model. Obviously, the specific embodiments described are only a part of the embodiments of this utility model, and not all of them.

[0020] The following is in conjunction with the appendix Figure 1-2 The present invention will be described in further detail below.

[0021] Example 1:

[0022] A battery cell housing structure with a reinforced composite aluminum shell includes an aluminum alloy substrate 1, a protective plate 2 on the right side of the aluminum alloy substrate 1, the protective plate 2 being made of 304 stainless steel, a corrosion-resistant plate 3 attached to the outside of the battery cell body 4 on the left side of the aluminum alloy substrate 1, the corrosion-resistant plate 3 being made of titanium alloy TA2, a first reinforcing rib 5 embedded between the protective plate 2 and the aluminum alloy substrate 1, and a second reinforcing rib 6 embedded between the aluminum alloy substrate 1 and the corrosion-resistant plate 3, both the first reinforcing rib 5 and the second reinforcing rib 6 being made of 7075 aluminum alloy with a tensile strength ≥500MPa.

[0023] The battery cell casing structure uses an aluminum alloy substrate 1 as the core support layer. The corrosion-resistant plate 3 on the left side directly contacts the battery cell body 4, blocking electrolyte corrosion. The protective plate 2 on the right side resists external environmental impact. The first reinforcing rib 5 and the second reinforcing rib 6 are located on both sides of the substrate to form a double composite reinforcement structure. By combining with the aluminum alloy substrate 1 and the protective plate 2 / corrosion-resistant plate 3, the overall structural rigidity is enhanced, solving the problem of insufficient strength of the aluminum alloy casing that relies solely on the substrate in the existing technology. At the same time, the corrosion-resistant plate 3 achieves anti-corrosion function, taking into account both strength and corrosion resistance, and reducing the risk of casing deformation and perforation.

[0024] In this embodiment, the first reinforcing rib 5 and the second reinforcing rib 6 have the same shape and structure and are both "J" shaped. The bend of the first reinforcing rib 5 abuts against the bend of the second reinforcing rib 6. The bend of the "J" shaped structure forms a mechanical support point that can disperse stress. After the bends of the two reinforcing ribs abut, they form a cooperative support structure similar to bidirectional clamping, which transmits and disperses external impact force or internal stress to the aluminum alloy substrate 1 and the protective plate 2 or corrosion-resistant plate 3 through the abutment, avoiding local stress concentration. Compared with single-direction or straight reinforcing ribs, the bending design of the "J" shaped structure enhances the bending and extrusion resistance. After the two reinforcing ribs abut, they form a cooperative force-bearing system, which further improves the overall structure's resistance to deformation and strengthens the protective effect of the outer shell on the battery cell.

[0025] In this embodiment, the corrosion-resistant plate 3 is provided with a number of grooves 7. The grooves 7 increase the surface area of ​​the corrosion-resistant plate 3. On the one hand, it can expand the contact area with air and accelerate the dissipation of heat generated when the battery cell is working. On the other hand, the groove structure can reduce the amount of material used and reduce the weight without reducing the overall strength of the plate, thus taking into account both heat dissipation and lightweighting.

[0026] In this embodiment, the cross-sectional shape of the groove 7 is an isosceles trapezoid. The two sides of the groove 7 with the isosceles trapezoidal cross-section are inclined symmetrically. Compared with the right-angle or arc-shaped groove 7, the stress distribution is more uniform, which can reduce the stress concentration at the edge of the groove 7 caused by the heating and expansion of the battery cell or external extrusion, and prevent the groove 7 from cracking due to stress concentration.

[0027] In this embodiment, the outer layer of the protective plate 2 is provided with a TPU elastic layer 8. The TPU elastic layer 8 is connected to the protective plate 2 by hot melt adhesive, and the bonding strength is ≥4MPa. TPU (thermoplastic polyurethane) has high elasticity. When the shell is subjected to external impact, the TPU elastic layer 8 absorbs the impact force through its own deformation and converts the impact force into elastic deformation energy, reducing the force transmitted to the internal aluminum alloy substrate 1 and the battery cell body 4, improving the impact resistance of the shell, buffering the external impact force, and further protecting the battery cell from external mechanical damage.

[0028] In this embodiment, the surface of the TPU elastic layer 8 is provided with a plurality of protrusions 9. The protrusions 9 increase the buffer distance when the TPU elastic layer contacts the outside. When it is impacted, the protrusions 9 deform first, disperse the local impact force, further enhance the buffering effect, and improve the impact resistance.

[0029] The working principle of this utility model is as follows: The battery cell shell structure with reinforced composite aluminum shell includes an aluminum alloy substrate 1. A protective plate 2 is provided on the right side of the aluminum alloy substrate 1, and a corrosion-resistant plate 3 is provided on the left side of the aluminum alloy substrate 1, which is attached to the outside of the battery cell body 4. A first reinforcing rib 5 is embedded between the protective plate 2 and the aluminum alloy substrate 1, and a second reinforcing rib 6 is embedded between the aluminum alloy substrate 1 and the corrosion-resistant plate 3. In this battery cell shell structure, the aluminum alloy substrate 1 serves as the core support layer. The corrosion-resistant plate 3 on the left side directly contacts the battery cell body 4, preventing electrolyte corrosion. The protective plate 2 on the right side resists external environmental impact. The first reinforcing rib 5 and the second reinforcing rib 6 are located on both sides of the substrate, forming a double composite reinforcement structure. The first reinforcing rib 5 and the second reinforcing rib 6 have the same shape and structure and are both "J" shaped. The bend of the first reinforcing rib 5 abuts against the bend of the second reinforcing rib 6. The bend of the "J" shaped structure forms a mechanical support point that can disperse stress. After the bends of the two reinforcing ribs abut against each other, a cooperative support structure similar to bidirectional clamping is formed, which can dissipate external impact force or internal stress. The stress is transferred and dispersed to the aluminum alloy substrate 1 and the protective plate 2 or corrosion-resistant plate 3 through the contact point, avoiding local stress concentration. Compared with single-direction or straight reinforcing ribs, the bending design of the "J"-shaped structure enhances the resistance to bending and extrusion. After the two reinforcing ribs contact, they form a synergistic force-bearing system, further improving the overall structure's resistance to deformation and strengthening the shell's protection effect on the battery cell. By combining with the aluminum alloy substrate 1 and the protective plate 2 / corrosion-resistant plate 3, the overall structural rigidity is enhanced, solving the problem of insufficient strength of the aluminum alloy shell relying solely on the substrate in the existing technology. At the same time, the corrosion-resistant plate 3 achieves anti-corrosion function, balancing strength and corrosion resistance, and reducing the risk of shell deformation and perforation.

[0030] It should be noted that, depending on the implementation needs, the various components described in the embodiments of this utility model can be divided into more components, or two or more components or parts of components can be combined into new components to achieve the purpose of the embodiments of this utility model. The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An electrode cell housing structure of a reinforced rib composite aluminum case, characterized by: The device includes an aluminum alloy substrate (1), a protective plate (2) on the right side of the aluminum alloy substrate (1), a corrosion-resistant plate (3) that is attached to the outside of the battery cell body (4) on the left side of the aluminum alloy substrate (1), a first reinforcing rib (5) embedded between the protective plate (2) and the aluminum alloy substrate (1), and a second reinforcing rib (6) embedded between the aluminum alloy substrate (1) and the corrosion-resistant plate (3).

2. The cell case structure of the reinforced rib composite aluminum case according to claim 1, characterized in that: The first reinforcing rib (5) and the second reinforcing rib (6) have the same shape and structure and are both "J" shaped. The bend of the first reinforcing rib (5) abuts against the bend of the second reinforcing rib (6).

3. The cell case structure of the reinforced rib composite aluminum case according to claim 1, characterized in that: The corrosion-resistant plate (3) is provided with several grooves (7).

4. The battery cell housing structure with reinforced composite aluminum shell according to claim 3, characterized in that: The groove (7) has an isosceles trapezoidal cross-sectional shape.

5. The cell case structure of the reinforced rib composite aluminum case according to claim 1, characterized in that: The outer layer of the protective plate (2) is provided with a TPU elastic layer (8).

6. The cell case structure of the reinforced rib composite aluminum case according to claim 5, wherein: The surface of the TPU elastic layer (8) is provided with several protrusions (9).

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