Module composite material side plate and battery module

Abstract

The utility model relates to the technical field of modular batteries, in particular to a module composite material side plate and a battery module. The module composite material side plate comprises an interlayer composite material plate body, the surface layer of the interlayer composite material plate body is a non-metal composite material layer, and the core layer of the interlayer composite material plate body is an energy-absorbing core layer. According to the module composite material side plate disclosed by the utility model, the non-metal composite material layer is designed on the surface layer of the interlayer composite material plate body, and on the basis of ensuring the structural strength of the module side plate, the core layer of the module side plate is used as an energy-absorbing core layer to absorb the space occupied by the expansion of the side surface of a battery module, so that the module side plate is prevented from being extruded to deform or crack.

Description

Technical Field

[0001] The utility model relates to the technical field of modular batteries, in particular to a module composite material side plate and a battery module. Background Art

[0002] A square aluminum shell battery pack is a battery module that uses aluminum as its shell. The structure of the battery module is as follows: Figure 1 As shown, the battery module comprises module side panels 2 disposed on both sides of the battery module body 1 and end panels 3 disposed at both ends of the battery module body 1. The module side panels 2 and the end panels 3 are welded to form a rectangular structure. The battery module is restrained and fixed together by the rectangular structure formed by the end panels 3 and the module side panels 2. Currently, commonly used module side panels are generally metal side panels. When battery modules using metal side panels are used in mining vehicles or heavy trucks, they are often affected by harsh working conditions. For example, muddy and bumpy road conditions can cause the battery module to vibrate and impact the module side panels 2, causing damage to the module side panels 2. Secondly, when the metal module side panels are mechanically connected to the battery module, parasitic capacitance is easily formed between the two (parasitic capacitance refers to the capacitance generated between two conductors due to the presence of an insulating medium). That is, in the battery module, the metal side panels, as one of the conductors, are separated from the battery cells or other conductors within the battery module by a certain distance and insulating medium, thus forming parasitic capacitance. This poses a risk of arcing during battery charging, affecting the electrical safety of the battery module.

[0003] To address the above issues, a Chinese invention patent application with application publication number CN117317510A and publication date December 29, 2023, discloses a battery module and energy storage box. The battery module includes side panels arranged on both sides of the battery module body. The side panels include multiple layers of glass fiber fabric and multiple layers of unidirectional yarn, which are connected to form a whole by resin. The glass fiber layers in the side panels of this battery module enhance the structural strength of the composite side panels. At the same time, the insulating properties of the composite material effectively prevent the formation of parasitic capacitance between the side panels and the battery module, thereby preventing arcing and ensuring the electrical safety of the battery module.

[0004] A Chinese invention patent application with application publication number CN117638377A and a publication date of March 1, 2024, discloses a rechargeable battery module comprising a pair of side panels disposed on either side of the module. The side panels comprise a metal plate and an insulating portion, the insulating portion being a synthetic resin layer integrally molded onto the metal plate. In this battery module, the metal plate interposed within the synthetic resin layer enhances the mechanical strength of the side panels.

[0005] Although the above two existing technologies eliminate the parasitic capacitance generated by the metal side panels, strengthen the structural strength of the side panels, and provide better protection for the battery module from the outside, the side panels disclosed in the first patent document are composite side panels as a whole, and the overall rigidity is insufficient; although the side panels disclosed in the second patent application document have metal core plates inside, the structural strength of the synthetic resin is limited, and the strength is still insufficient. Secondly, in addition to being affected by external influences such as vibration, impact, and collision during use, the battery module will also be affected by the internal battery cells themselves. During use, as the number of battery cell cycles increases, the side surfaces of the battery module body 1 will expand and increase, and side deformation will often occur. The contact area between the battery module body 1 and the module side panels will decrease, causing the module side panels to be squeezed, deformed, or cracked. Utility Model Content

[0006] The purpose of the present utility model is to provide a module composite material side panel to solve the technical problem in the prior art that the module side panel has insufficient structural strength and is easily deformed and cracked by the expansion, extrusion and cracking of the battery module side; at the same time, the purpose of the present utility model is also to provide a battery module using the above-mentioned module composite material side panel.

[0007] To achieve the above objectives, the present invention provides a technical solution for a modular composite material side panel:

[0008] A modular composite material side panel comprises a sandwich composite material plate body, wherein the surface layer of the sandwich composite material plate body is a non-metallic composite material layer, and the core layer is an energy-absorbing core layer.

[0009] Beneficial effect: The utility model provides a new module composite material side panel, which designs the surface layer as a non-metallic composite material layer and the internal core layer as an energy-absorbing core layer. The module composite material side panel of the present application can absorb the space occupied by the increased expansion of the battery module side on the basis of meeting the structural strength and electrical safety, thereby preventing the module composite material side panel from deformation or cracking.

[0010] Furthermore, the energy-absorbing core layer is a metal layer, and the metal layer has an energy-absorbing structure.

[0011] Furthermore, the energy absorbing structure is an energy absorbing cavity arranged in the metal layer.

[0012] Furthermore, the energy-absorbing cavity is a polygonal cavity.

[0013] Furthermore, the metal layer is a sandwich plate comprising two parallel outer metal plates and an inclined reinforcing rib arranged between the two outer metal plates, and the inclined reinforcing rib and the two outer metal plates enclose the polygonal cavity.

[0014] Furthermore, the polygonal cavity is a triangular cavity.

[0015] Furthermore, the energy absorbing core layer is a harmonica tube extruded profile.

[0016] Furthermore, the energy-absorbing core layer is a fiber-reinforced composite material layer.

[0017] Furthermore, the non-metallic composite material layer is a fiber-reinforced composite material layer.

[0018] To achieve the above objectives, the present invention provides a technical solution for a battery module using the above-mentioned module composite material side plate:

[0019] A battery module comprises a battery module body and a module composite material side panel, wherein the module composite material side panel comprises a sandwich composite material panel body, the surface layer of the sandwich composite material panel body is a non-metallic composite material layer, and the core layer is an energy-absorbing core layer.

[0020] Beneficial effect: The utility model provides a new battery module, which adopts the above-mentioned module composite material side panel. The module composite material side panel is designed with an energy-absorbing core layer to absorb the space occupied by the expansion of the battery module side, so that the battery module can effectively prevent the module composite material side panel from deformation or cracking on the basis of meeting the structural strength and electrical safety, thereby extending the service life of the battery module.

[0021] Furthermore, the energy-absorbing core layer is a metal layer, and the metal layer has an energy-absorbing structure.

[0022] Furthermore, the energy absorbing structure is an energy absorbing cavity arranged in the metal layer.

[0023] Furthermore, the energy-absorbing cavity is a polygonal cavity.

[0024] Furthermore, the metal layer is a sandwich plate comprising two parallel outer metal plates and an inclined reinforcing rib arranged between the two outer metal plates, and the inclined reinforcing rib and the two outer metal plates enclose the polygonal cavity.

[0025] Furthermore, the polygonal cavity is a triangular cavity.

[0026] Furthermore, the energy absorbing core layer is a harmonica tube extruded profile.

[0027] Furthermore, the energy-absorbing core layer is a fiber-reinforced composite material layer.

[0028] Furthermore, the non-metallic composite material layer is a fiber-reinforced composite material layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural diagram of a battery module in the prior art;

[0030] Figure 2 This is a structural diagram of the connection relationship between the battery module body and the module side plate of the utility model;

[0031] Figure 3 This is a structural schematic diagram of an embodiment of a modular composite material side panel of the present utility model.

[0032] In the figure: 1. Battery module body; 2. Module side panel; 3. End plate; 4. Structural adhesive; 5. Glass fiber layer; 6. Base layer; 7. Reinforcement ribs; 8. Triangular cavity; 9. Metal plate. DETAILED DESCRIPTION

[0033] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0034] The utility model provides a new module composite material side panel. Its main inventive concept is: combining a composite material layer and a sandwich structure layer, utilizing the high strength and high insulation properties of the composite material to meet the mechanical structural strength of the module side panel, and at the same time designing the sandwich structure layer so that the sandwich structure layer can be used to absorb the increased volume of the battery module side surface, thereby preventing the module composite material side panel from being squeezed, deformed or cracked.

[0035] Based on the above main concepts, the basic technical solution of the composite side panel of the present invention is as follows: it comprises a sandwich composite panel body, the surface layer of which is a non-metallic composite material layer, and the core layer is an energy-absorbing core layer. By designing the surface layer as a non-metallic composite layer and the core layer of the sandwich structure as an energy-absorbing core layer, the expansion space caused by the module side can be absorbed while maintaining the required structural strength, thereby preventing the side panel from being deformed or cracked due to compression.

[0036] The following is further described through different embodiments:

[0037] The present invention provides a more optimal embodiment in which the energy-absorbing core layer is a metal layer having an energy-absorbing structure. By designing the energy-absorbing core layer as a metal layer, the overall structural strength of the module composite material side panels is enhanced. While maintaining the overall structural strength of the module composite material side panels, the metal layer having an energy-absorbing structure is designed to absorb the increased volume of the battery module side panels and prevent compression deformation or cracking of the side panels.

[0038] The present invention provides a more preferred embodiment, wherein the energy-absorbing structure is an energy-absorbing cavity provided on the metal layer. The energy-absorbing structure on the metal layer is further defined as the energy-absorbing cavity. During use, as the number of cycles of the battery module increases, the sides of the battery module body 1 expand and increase. The expanded sides of the battery module body 1 squeeze the module side panels 2. At this time, the energy-absorbing cavity can be compressed to absorb the space occupied by the expanded sides of the battery module body 1, thereby preventing the module composite material side panels from being squeezed, deformed, or cracked.

[0039] In one embodiment, the energy-absorbing cavity is designed as a circular hole-shaped cavity. The circular hole-shaped cavity can also achieve the corresponding absorption of the space occupied by the lateral expansion of the battery module body 1. However, this structure has limited structural strength in enhancing the side panels of the module composite material. To this end, the present invention provides a more optimal embodiment, in which the energy-absorbing cavity is a polygonal cavity. By designing the energy-absorbing cavity as a regular polygonal structure, it is beneficial to strengthen the overall mechanical structural strength of the side panels of the module composite material to a certain extent. In other embodiments, the energy-absorbing cavity can also be designed as a honeycomb cavity.

[0040] The present invention provides a better embodiment. Figure 3 As shown, the metal layer is a sandwich panel comprising two parallel outer metal plates 9 and inclined reinforcing ribs 7 disposed between the two outer metal plates 9. The inclined reinforcing ribs 7 and the two outer metal plates enclose the aforementioned polygonal cavity. In this embodiment, the polygonal cavity for absorbing the increased volume of the battery module's lateral expansion is further designed as a triangular cavity 8 formed between the two metal plates 9 and by the reinforcing ribs 7. The stability of the triangle ensures the mechanical structural strength of the module composite side panel, while also facilitating the absorption of the space occupied by the increased volume of the battery module's lateral expansion.

[0041] The present invention provides a more preferred embodiment in which the energy-absorbing core layer is an extruded harmonica tube profile. By designing the energy-absorbing core layer as an extruded harmonica tube profile, the side panels provided by the present invention have strong structural strength and can effectively absorb the space occupied by expansion, thereby preventing the side panels from being squeezed, deformed, or cracked.

[0042] The present invention provides a more preferred embodiment, wherein the energy-absorbing core layer is a fiber-reinforced composite material layer. The fiber-reinforced composite material layer improves the overall structural strength of the module composite material side panel and also reduces the weight of the side panel.

[0043] The present invention provides a more optimal embodiment, wherein the non-metallic composite material layer is a fiber-reinforced composite material layer. In this embodiment, the surface layer of the sandwich composite material plate is further defined as a fiber-reinforced composite material layer, which includes a matrix layer, and a reinforcement is laid between two adjacent matrix layers. The reinforcement can be a glass fiber reinforcement or other reinforcement that can enhance the structural strength of the side panel. The matrix layer can be an epoxy resin layer or a polyurethane layer. Since epoxy resin and polyurethane materials themselves have good insulation and mechanical strength and can withstand greater pressure and load, using them as the material of the matrix layer is beneficial to improving the overall structural strength of the module composite material side panel, so that it is suitable for use as a battery module side panel in various harsh environments.

[0044] The present invention provides another embodiment of a battery module utilizing the aforementioned module composite side panels, comprising a battery module body and a module composite side panel. The non-metallic composite surface layer of the sandwich composite panel enhances the structural strength of the composite side panel, while the energy-absorbing core layer of the sandwich composite panel serves as an intermediate layer. This allows the energy-absorbing core layer of the module composite side panel to effectively absorb any lateral expansion of the battery module after prolonged use, thereby preventing damage to the battery module and extending its service life.

[0045] In one embodiment, the battery module body 1 is constrained and fixed by a rectangular structure formed by the module composite material side plate 2 and the end plate 3. This structure can also realize the protection of the module composite material side plate 2 to the battery module body 1, but there is instability. For this reason, the present utility model provides a better embodiment, such as Figure 2 As shown, the battery module body 1 and the module composite material side panels 2 are fixedly connected by structural adhesive 4. By fixing the battery module and the module side panels with structural adhesive 4, even if the battery module's side surfaces deform after prolonged use, the increased volume is absorbed by the module composite material side panels without causing debonding, thereby ensuring the stability of the battery module's overall structure and having good application prospects.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall also be included in the scope of protection of the present invention.

Claims

1. A modular composite material side panel, characterized in that: The invention comprises a sandwich composite material plate body, the surface layer of the sandwich composite material plate body is a non-metallic composite material layer, and the core layer is an energy-absorbing core layer.

2. The modular composite material side panel according to claim 1, characterized in that: The energy absorbing core layer is a metal layer, and the metal layer has an energy absorbing structure.

3. The modular composite material side panel according to claim 2, characterized in that: The energy absorbing structure is an energy absorbing cavity arranged in the metal layer.

4. The modular composite material side panel according to claim 3, characterized in that: The energy absorbing cavity is a polygonal cavity.

5. The modular composite material side panel according to claim 4, characterized in that: The metal layer is a sandwich plate comprising two parallel outer metal plates and an inclined reinforcing rib arranged between the two outer metal plates. The inclined reinforcing rib and the two outer metal plates enclose the polygonal cavity.

6. The modular composite material side panel according to claim 5, characterized in that: The polygonal cavity is a triangular cavity.

7. The modular composite material side panel according to claim 1, characterized in that: The energy absorbing core layer is a harmonica tube extruded profile.

8. The modular composite material side panel according to claim 1, wherein: The energy-absorbing core layer is a fiber-reinforced composite material layer.

9. The modular composite material side panel according to any one of claims 1 to 8, characterized in that: The non-metallic composite material layer is a fiber-reinforced composite material layer.

10. A battery module, comprising a battery module body and a module composite material side plate, characterized in that: The structure of the module composite material side panel is the module composite material side panel according to any one of claims 1 to 9.

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