Lithium battery shell with protective structure

Abstract

The utility model relates to a lithium battery shell with protection structure belongs to lithium battery shell technical field. The lithium battery shell with protection structure, include: base, outer frame, buffer assembly, protective housing, battery body, and the gap is left between multiple outer frames and protective housing, and multiple buffer assemblies are respectively arranged in both sides of multiple outer frames, the sealing gasket is installed to the junction of protective housing through with base, and the independent safety cavity is formed inside, and the battery body adopts the soft package electric core structure, and the surface is wrapped with aerogel heat insulation film, and the gap between outer frame and protective housing constitutes two -level buffer space, and the buffer assembly is arranged in the recess of both sides of outer frame, and when the collision, the buffer assembly can absorb the impact energy, realizes the impact force dispersion in three -dimensional direction, and this structure passes through multistage buffer mechanism, effectively solves the security hidden danger of lithium battery under the extrusion working condition, guarantees the unobstructed heat dissipation passage simultaneously, promotes the environmental adaptability and the service life of battery system.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery casing technology, and in particular to a lithium battery casing with a protective structure. Background Technology

[0002] Lithium-ion batteries are a typical type of rechargeable battery. They use lithium metal or lithium ions as the positive electrode active material and carbon materials or metal oxides as the negative electrode material. The electrolyte is an organic electrolyte containing lithium salts. Lithium-ion batteries typically use a square casing design because, compared to other shapes, a square casing can better utilize space, reduce the gaps between battery components, thereby increasing the density and energy density of the battery components. This allows the batteries to be stacked more easily to form battery packs with higher voltage and larger capacity.

[0003] Lithium batteries are prone to structural deformation when subjected to mechanical impact, leading to electrode material detachment, electrolyte leakage, and abnormal voltage fluctuations, which significantly shortens the battery cycle life. Traditional protection solutions mostly use rigid shells for fixation, and the shock absorption mechanism relies on only a single buffer layer, which has limited damping effect on instantaneous impacts and is difficult to meet the safety protection requirements of mobile devices, electric vehicles, and other complex operating conditions. Utility Model Content

[0004] Therefore, it is necessary to provide a lithium battery casing with a protective structure to address the problem that traditional protection solutions often use rigid shells for fixation and rely on a single buffer layer for shock absorption, which has limited damping effect against instantaneous impacts and cannot meet the safety protection needs of mobile devices, electric vehicles and other complex operating conditions.

[0005] A lithium battery casing with a protective structure includes: a base, a protective casing fixedly connected to the top of the base, a battery body disposed inside the protective casing, and the battery body located on the base;

[0006] The outer frame is provided in multiple parts, and each of the multiple outer frames is fitted onto the surface of the battery body, with a gap between the multiple outer frames and the protective shell;

[0007] The buffer components are provided in multiple ways, and the multiple buffer components are respectively disposed on both sides of the multiple outer frame.

[0008] In one embodiment, a cover plate is fixedly connected to the top of the protective housing, the cover plate is located above the battery body, and the power line of the battery body passes through the cover plate and is electrically connected to the outside.

[0009] In one embodiment, a limiting groove is formed inside the base, the lower part of the protective shell is inserted into the limiting groove and fits against the inner wall of the base, and a fixing frame is fixedly fitted on the surface of the protective shell, the fixing frame covers the surface of the limiting groove and is fixedly connected to the base below with bolts.

[0010] In one embodiment, a buffer seat is fixedly provided inside the base, and the upper part of the buffer seat is attached to the lower part of the battery body.

[0011] In one embodiment, the four corners of the plurality of fixed frames are movably connected to limit posts, and the plurality of fixed frames slide along the surfaces of the plurality of limit posts, so that the plurality of fixed frames are on the same vertical line.

[0012] In one embodiment, locking sleeves are movably fitted onto the surfaces of the plurality of limiting posts, and the plurality of locking sleeves are respectively disposed on the upper and lower sides of the plurality of fixing frames.

[0013] In one embodiment, limiting plates are provided on both sides above one of the fixed frames, and the two limiting plates are respectively located above the two sides of the battery body.

[0014] In one embodiment, slots are provided on both sides of the outer frame, and the buffer assembly includes a positioning plate located in the slot. Spring plates are fixedly connected to both sides of the positioning plate, and fixing blocks are fixedly connected to the side of the two spring plates away from the positioning plate. Both fixing blocks are fixed to the inner wall of the protective shell. Beneficial effects

[0015] 1. The protective shell is fitted with a sealing gasket at the connection point with the base, forming an independent safety cavity inside. The battery body adopts a soft-pack cell structure, with an aerogel heat insulation film covering the surface, and maintains a safe distance from the inner wall of the protective shell. The gap between the outer frame and the protective shell forms a two-stage buffer space. The buffer components are set in the grooves on both sides of the outer frame. When a collision occurs, the buffer components can absorb the impact energy and disperse the impact force in three dimensions. This structure effectively solves the safety hazards of lithium batteries under extrusion conditions through a multi-stage buffer mechanism, while ensuring unobstructed heat dissipation channels and improving the environmental adaptability and service life of the battery system.

[0016] 2. The lower part of the protective shell is inserted into the limiting groove through an interference fit. The mating surface is coated with thermally conductive silicone grease to ensure a seamless fit with the inner wall of the base. The surface of the protective shell is fixedly fitted with an aerospace-grade aluminum alloy fixing frame through an injection molding process. The fixing frame adopts a honeycomb-shaped reinforcing rib structure, covers the surface of the limiting groove, and is rigidly connected to the base by stainless steel bolts. The bolt holes adopt an elastic washer anti-loosening design. This composite fixing method makes the deformation of the protective shell smaller when subjected to lateral impact force. At the same time, the stress dispersion structure of the fixing frame can effectively reduce fatigue damage at the connection parts and significantly improve the structural stability of the battery body under complex working conditions. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the outer shell of this utility model;

[0020] Figure 3 This is a schematic diagram of the overall exploded structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the base structure of this utility model;

[0022] Figure 5 This is an enlarged view of the buffer component structure of this utility model.

[0023] Figure label:

[0024] 100. Base; 101. Protective shell; 102. Cover plate; 103. Fixing frame; 104. Limiting groove; 105. Buffer seat; 200. Battery body; 300. Outer frame; 301. Limiting post; 302. Locking sleeve; 303. Slot; 400. Limiting plate; 500. Buffer assembly; 501. Positioning plate; 502. Spring plate; 503. Fixing block. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0026] The following is combined Figure 1 - Figure 5 This invention describes a lithium battery casing with a protective structure.

[0027] In one embodiment, a lithium battery casing with a protective structure includes: a base 100, an outer frame 300, and a buffer assembly 500. A protective shell 101 is fixedly connected to the top of the base 100. A battery body 200 is disposed inside the protective shell 101 and is located on the base 100. Multiple outer frames 300 are provided, and each outer frame 300 is fitted onto the surface of the battery body 200. A gap is left between the multiple outer frames 300 and the protective shell 101. Multiple buffer assemblies 500 are provided, and the multiple buffer assemblies 500 are respectively disposed on both sides of the multiple outer frames 300.

[0028] In this embodiment, the base 100 serves as the supporting body and has a flame-retardant material layer integrated on its surface, which can effectively prevent thermal runaway from spreading. The protective shell 101 has a sealing gasket installed at the connection with the base 100, forming an independent safety cavity inside. The battery body 200 adopts a soft-pack cell structure, and its surface is wrapped with an aerogel heat insulation film, maintaining a safe distance of 2-5mm from the inner wall of the protective shell 101.

[0029] Multiple outer frame frames 300 are arranged in a ring array and are made of high-strength aluminum alloy. The gap between the outer frame frame 300 and the protective shell 101 forms a secondary buffer space. The buffer component 500 is set in the groove on both sides of the outer frame frame 300. When a collision occurs, the buffer component 500 can absorb the impact energy and disperse the impact force in three dimensions. This structure effectively solves the safety hazards of lithium batteries under extrusion conditions through a multi-level buffer mechanism, while ensuring unobstructed heat dissipation channels and improving the environmental adaptability and service life of the battery system.

[0030] like Figure 1 , Figure 2 and Figure 3As shown, a cover plate 102 is fixedly connected to the top of the protective shell 101. The cover plate 102 is located above the battery body 200. The power line of the battery body 200 passes through the cover plate 102 and is electrically connected to the outside. A limiting groove 104 is opened inside the base 100. The lower part of the protective shell 101 is inserted into the limiting groove 104 and fits against the inner wall of the base 100. A fixing frame 103 is fixedly sleeved on the surface of the protective shell 101. The fixing frame 103 covers the surface of the limiting groove 104 and is bolted to the lower base 100.

[0031] In this embodiment, the cover plate 102 is located above the battery body 200. The inner surface of the cover plate 102 is integrated with a conductive rubber sealing layer, which can achieve dustproof and waterproof. The power line of the battery body 200 is a nickel alloy plated wire, which is electrically connected to the outside through the ceramic through-wall sleeve on the side wall of the cover plate 102, effectively avoiding the risk of short circuit due to electrode contact.

[0032] The lower part of the protective shell 101 is inserted into the limiting groove 104 through an interference fit. The mating surface is coated with thermally conductive silicone grease to ensure a seamless fit with the inner wall of the base 100. The surface of the protective shell 101 is fixedly fitted with an aerospace-grade aluminum alloy fixing frame 103 through an injection molding process. The fixing frame 103 adopts a honeycomb-shaped reinforcing rib structure, covers the surface of the limiting groove 104, and is rigidly connected to the base 100 by stainless steel bolts. The bolt holes adopt an elastic washer anti-loosening design. This composite fixing method makes the deformation of the protective shell 101 smaller when subjected to lateral impact force. At the same time, the stress dispersion structure of the fixing frame 103 can effectively reduce fatigue damage at the connection parts and significantly improve the structural stability of the battery body 200 under complex working conditions.

[0033] like Figure 2 , Figure 3 and Figure 4 As shown, a buffer seat 105 is fixedly provided inside the base 100. The upper part of the buffer seat 105 is attached to the lower part of the battery body 200. Limiting posts 301 are movably inserted into the four corners of multiple fixing frames 103. Multiple fixing frames 103 slide along the surface of multiple limiting posts 301 so that multiple fixing frames 103 are on the same vertical line. Locking sleeves 302 are movably sleeved on the surface of multiple limiting posts 301. Multiple locking sleeves 302 are respectively provided on the upper and lower sides of multiple fixing frames 103.

[0034] In this embodiment, a buffer seat 105 is fixed inside the base 100 by a molding process. The buffer seat 105 is made of microporous foamed silicone material and has a honeycomb aluminum support frame embedded inside. The upper part is seamlessly attached to the bottom of the battery body 200 by 3M thermally conductive double-sided adhesive, which can absorb vertical impact force and achieve efficient heat conduction.

[0035] Multiple fixed frames 103 are movably connected to limit posts 301 at their four corners via precision stamping. These limit posts 301 are made of high-strength titanium alloy with a nickel-plated surface and have spiral guide grooves on their surfaces, allowing the fixed frames 103 to slide along the axis of the posts. This ensures that the multiple fixed frames 103 remain vertically aligned. The locking sleeves 302 movably fitted on the surface of the limit posts 301 are made of engineering plastic injection molding. The upper and lower sets of locking sleeves 302 achieve one-way locking through a ratchet structure. Together with the elastic positioning beads on the side walls of the fixed frames 103, a three-level anti-loosening mechanism is formed. This design ensures that the relative displacement between the multiple fixed frames 103 is small when the overall structure is subjected to vibration acceleration. At the same time, the deformation of the buffer seat 105 is small. Together with the outer frame 300 and the buffer assembly 500, it forms a dynamic protection system, significantly improving the safety performance of the battery module under mechanical abuse conditions.

[0036] like Figure 2 , Figure 3 and Figure 5 As shown, a limiting plate 400 is provided on both sides of the upper part of one of the fixed frames 103. The two limiting plates 400 are respectively located on the upper sides of the battery body 200. The outer frame 300 has slots 303 on both sides. The buffer assembly 500 includes a positioning plate 501 located in the slot 303. Spring plates 502 are fixedly connected to both sides of the positioning plate 501. Fixing blocks 503 are fixedly connected to the side of the two spring plates 502 away from the positioning plate 501. Both fixing blocks 503 are fixed to the inner wall of the protective shell 101.

[0037] In this embodiment, the upper sides of one of the fixed frames 103 are formed by precision injection molding of limit plates 400. The limit plates 400 are made of engineering plastic with added glass fiber and have a serrated anti-slip texture on the surface. They extend to the upper part of the battery body 200 on both sides to form a lateral constraint structure. The side wall of the outer frame 300 is embedded with a positioning plate 501 through the slot 303. The positioning plate 501 is made of polyetheretherketone and has a diamond coating on the surface to reduce the coefficient of friction. The spring plates 502 on both sides of the positioning plate 501 are made of corrugated titanium alloy thin plates and are connected to the fixing block 503 by diffusion welding. The fixing block 503 is fixed to the reinforcing rib of the inner wall of the protective shell 101 by laser spot welding.

[0038] When the outer frame 300 is impacted, the spring plate 502 first undergoes elastic deformation to absorb the first level of energy, the positioning plate 501 slides along the slot 303 to trigger the second level of buffering, and at the same time the limiting plate 400 prevents the battery body 200 from excessive displacement through mechanical limiting. This composite buffer structure enables the buffer component 500, the buffer seat 105 and the outer frame 300 to form a gradient energy absorption system when the system is subjected to impact energy, which significantly improves the survivability of the battery module under extreme conditions such as drops and compression.

[0039] Working principle: When encountering an external impact, the outer frame 300 first disperses the local stress to the entire aluminum alloy frame through the ring array structure. The secondary buffer space between the outer frame 300 and the protective shell 101 forms the first energy absorption zone. The wave-shaped titanium alloy spring plate 502 of the buffer component 500 then undergoes elastic deformation, converting the impact energy into elastic potential energy. At the same time, the positioning plate 501 slides along the slot 303 to trigger the secondary buffer, forming a gradient energy attenuation.

[0040] If the impact force is not completely dissipated, the side wall of the fixed frame 103 and the limiting post 301 interlock, and with the three-level anti-loosening mechanism of the ratchet locking sleeve 302, the residual energy is conducted to the base 100 through the limiting post 301. At this time, the microporous foamed silicone buffer seat 105 in the base 100 absorbs the final impact energy through the crushing deformation of the honeycomb aluminum skeleton. The thermally conductive double-sided adhesive layer simultaneously conducts the heat generated by the battery body 200 to the aluminum alloy base 100 for heat dissipation. Throughout the process, the aerogel heat insulation film maintains the thermal isolation between the battery body 200 and the protective shell 101, and the conductive rubber sealing layer and the ceramic through-wall sleeve ensure electrical safety. The buffer component 500, the buffer seat 105 and the outer frame 300 together form a gradient energy absorption system, which significantly improves the survivability of the battery module under extreme conditions such as drops and compression.

[0041] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A lithium battery casing with a protective structure, characterized in that, include: A base (100) is provided, and a protective shell (101) is fixedly connected to the top of the base (100). A battery body (200) is provided inside the protective shell (101), and the battery body (200) is located on the base (100). The outer frame (300) is provided in multiple ways, and the multiple outer frame (300) are all fitted onto the surface of the battery body (200), and there is a gap between the multiple outer frame (300) and the protective shell (101); A buffer assembly (500) is provided in multiple locations, with the multiple buffer assemblies (500) respectively located on both sides of the multiple outer frame (300).

2. The lithium battery casing with protective structure according to claim 1, characterized in that, A cover plate (102) is fixedly connected to the top of the protective shell (101). The cover plate (102) is located above the battery body (200). The power line of the battery body (200) passes through the cover plate (102) and is electrically connected to the outside.

3. The lithium battery casing with protective structure according to claim 2, characterized in that, The base (100) has a limiting groove (104) inside. The lower part of the protective shell (101) is inserted into the limiting groove (104) and fits against the inner wall of the base (100). A fixing frame (103) is fixedly sleeved on the surface of the protective shell (101). The fixing frame (103) covers the surface of the limiting groove (104) and is bolted to the base (100) below.

4. The lithium battery casing with protective structure according to claim 3, characterized in that, The base (100) is fixedly provided with a buffer seat (105) inside, and the upper part of the buffer seat (105) is attached to the lower part of the battery body (200).

5. The lithium battery casing with protective structure according to claim 3, characterized in that, The four corners of the multiple fixed frames (103) are movably connected to the limiting posts (301), and the multiple fixed frames (103) slide along the surface of the multiple limiting posts (301) so that the multiple fixed frames (103) are on the same vertical line.

6. The lithium battery casing with protective structure according to claim 5, characterized in that, Each of the multiple limiting posts (301) is movably fitted with a locking sleeve (302), and the multiple locking sleeves (302) are respectively located on the upper and lower sides of the multiple fixed frames (103).

7. The lithium battery casing with protective structure according to claim 6, characterized in that, Limiting plates (400) are provided on both sides above one of the fixed frames (103), and the two limiting plates (400) are respectively located on both sides above the battery body (200).

8. The lithium battery casing with protective structure according to claim 1, characterized in that, The outer frame (300) has slots (303) on both sides. The buffer assembly (500) includes a positioning plate (501) located in the slot (303). Spring plates (502) are fixedly connected to both sides of the positioning plate (501). Fixing blocks (503) are fixedly connected to the side of the two spring plates (502) away from the positioning plate (501). Both fixing blocks (503) are fixed to the inner wall of the protective shell (101).

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