Vehicle

Abstract

The utility model relates to battery technical field provides a kind of vehicle, the vehicle includes chassis and battery, chassis has first bottom surface and second bottom surface, first bottom surface is located the upper of the shell of battery, second bottom surface is located the upper of the electrical connection component of battery, first bottom surface is provided with support between shell, the first end of support is in contact with first bottom surface, the second end of support is in contact with shell, second bottom surface has gap between electrical connection component. Through the technical scheme provided in the present application, the problem that electrical connection component can be damaged when passenger steps on chassis by directly connecting electrical connection component with chassis in related art can be solved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a vehicle. Background Technology

[0002] The core of the design logic of CTB (Cell to Body) technology is to integrate the vehicle floor and the battery cover into one unit.

[0003] In related technologies, in order to control the charging and discharging of a battery, the battery has a bus, a sampling device, etc., which are used to electrically connect with the individual battery cells to control the individual battery cells.

[0004] However, in the design of related technologies, the battery terminals, busbars and other electrical connection components are connected to the chassis. Since the passenger compartment is directly above the chassis, when passengers step on the chassis, the terminals and busbars will bear direct force, which can easily cause the terminals and busbars to break, resulting in connection failure. Utility Model Content

[0005] This invention provides a vehicle to solve the problem in related technologies where electrical connection components are directly connected to the chassis, which may cause damage to the electrical connection components when passengers step on the chassis.

[0006] This utility model provides a vehicle, which includes a chassis and a battery. The chassis has a first bottom surface and a second bottom surface. The first bottom surface is located above the battery housing, and the second bottom surface is located above the battery electrical connection component. A support member is provided between the first bottom surface and the housing. The first end of the support member contacts the first bottom surface, and the second end of the support member contacts the housing. There is a gap between the second bottom surface and the electrical connection component.

[0007] By applying the technical solution of this utility model, a support member is installed between the vehicle chassis and the battery casing, and a gap is maintained between the second bottom surface and the battery's electrical connection components. This effectively solves the problem in related technologies where the electrical connection components are directly connected to the chassis, potentially causing damage to the electrical connection components when passengers step on the chassis. Specifically, the first end of the support member contacts the first bottom surface, and the second end contacts the casing. The support member can transfer the load when a passenger steps on the chassis to the battery casing, rather than directly acting on the electrical connection components. Furthermore, due to the support member and the gap between the second bottom surface and the electrical connection components, even if the chassis deforms under load, the electrical connection components are not directly affected, thus avoiding damage caused by direct force and significantly improving the stability and safety of the battery. Attached Figure Description

[0008] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0009] Figure 1 A schematic diagram of the structure of the battery and chassis of the vehicle provided in this embodiment of the present invention is shown;

[0010] Figure 2 A cross-sectional view of the battery and chassis of the vehicle provided in this embodiment of the present invention is shown;

[0011] Figure 3 A cross-sectional view of the battery and chassis of the vehicle provided in this embodiment of the present invention is shown. (The support member is a rigid support column.)

[0012] Figure 4 A cross-sectional view of the battery and chassis of the vehicle provided in this embodiment of the present invention (the support is an adhesive layer) is shown.

[0013] Figure 5 This shows another cross-sectional view of the battery and chassis of the vehicle provided in this embodiment of the present invention (the support is an adhesive layer);

[0014] Figure 6 A schematic diagram of the structure of a vehicle battery provided in an embodiment of the present invention is shown.

[0015] The above figures include the following reference numerals:

[0016] 10. Chassis; 11. First bottom surface; 12. Second bottom surface; 13. Receiving groove;

[0017] 20. Battery; 21. Housing; 211. Shoulder; 212. Edges and corners; 22. Electrical connection components; 221. Terminal post; 23. Explosion-proof valve;

[0018] 30. Supporting components; 31. Adhesive layer; 32. Rigid support column;

[0019] 40. Gap;

[0020] 50. Rubber strip;

[0021] D1, the distance between the electrical connection component and the side wall of the receiving groove;

[0022] D2, the distance between the first bottom surface and the shell;

[0023] H1, the height of the rubber retaining strip;

[0024] H2, the height of the gap;

[0025] L is the length of the rubber strip extending into the receiving groove. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0027] like Figures 1 to 6 As shown, this utility model embodiment provides a vehicle, which includes a chassis 10 and a battery 20. The chassis 10 has a first bottom surface 11 and a second bottom surface 12. The first bottom surface 11 is located above the housing 21 of the battery 20, and the second bottom surface 12 is located above the electrical connection component 22 of the battery 20. A support member 30 is provided between the first bottom surface 11 and the housing 21. The first end of the support member 30 contacts the first bottom surface 11, and the second end of the support member 30 contacts the housing 21. A gap 40 is provided between the second bottom surface 12 and the electrical connection component 22.

[0028] The vehicle provided in this embodiment effectively solves the problem in related technologies where the electrical connection component is directly connected to the chassis, potentially causing damage when a passenger steps on the chassis. Specifically, the first end of the support member 30 contacts the first bottom surface 11, and the second end contacts the housing 21. The support member 30 transfers the load from the passenger stepping on the chassis to the battery housing 21, rather than directly to the electrical connection component 22. Furthermore, because of the gap 40 between the second bottom surface 12 and the electrical connection component 22, even if the chassis deforms under load, the electrical connection component 22 remains unaffected, thus avoiding damage caused by direct force and significantly improving battery stability and safety.

[0029] It should be noted that the definition and function of a battery are as follows: a battery stores chemical energy and controllably converts chemical energy into electrical energy. In recyclable batteries, the active materials can be reactivated by charging after discharge, allowing for continued use. A battery consists of a casing and battery cells housed within the casing. The casing is a component that provides space to house electrode assemblies and other parts, isolating them from the external environment. The casing generally includes a body with an opening at at least one end and a receiving cavity. The opening of the casing can be closed by a cover plate, sealing and isolating the internal environment of the battery cell from the external environment. Casing materials include, but are not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and aluminum-plastic film.

[0030] like Figure 2 and Figure 3 As shown, a receiving groove 13 is provided on the side of the chassis 10 facing the battery 20. At least part of the electrical connection component 22 is located in the receiving groove 13. The bottom wall of the receiving groove 13 is a second bottom surface 12, and a first bottom surface 11 is located outside the receiving groove 13. The distance between the first bottom surface 11 and the housing 21 is less than the distance between the second bottom surface 12 and the housing 21. By providing the receiving groove 13, the distance between the first bottom surface 11 and the housing 21 can be shortened, the support of the support member 30 can be made more stable, and the thickness of the battery 20 can also be reduced.

[0031] In addition, the design of the receiving slot 13 not only saves space between the battery 20 and the chassis 10, but also provides extra protection for the electrical connection component 22. Even if the chassis 10 is impacted, the electrical connection component 22 is not easily damaged directly, which further enhances the protection capability of the battery 20 and reduces electrical connection failures caused by external factors.

[0032] The distance between the electrical connection component 22 and the side wall of the receiving groove 13 is D1mm, where 5mm≤D1mm≤30mm. By setting the distance D1 between the electrical connection component 22 and the side wall of the receiving groove 13 within the above range, it is possible to avoid collisions between the chassis 10 and the electrical connection component 22 due to excessive proximity, and also to avoid wasting space due to excessive distance.

[0033] In other words, by setting the distance D1 between the electrical connection component 22 and the side wall of the receiving groove 13 within the above-mentioned range, the safety of the electrical connection component 22 can be guaranteed, while maximizing the use of space resources, thus achieving a compact layout of the internal structure of the battery and effective protection of the electrical connection component.

[0034] Specifically, the distance D1mm between the electrical connection component 22 and the sidewall of the receiving groove 13 can be 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, or other values ​​between 5mm and 30mm.

[0035] like Figure 4 and Figure 5 As shown, in some embodiments, the support member 30 includes an adhesive layer 31, with a first end of the adhesive layer 31 bonded to the first bottom surface 11 and a second end of the adhesive layer 31 bonded to the housing 21. The adhesive layer 31, as a support member, can firmly fix the battery 20 to the chassis 10, while also providing a certain degree of cushioning.

[0036] Specifically, the adhesive properties of the adhesive layer 31 ensure a tight fit between the battery 20 and the chassis 10, while the elasticity of its material can absorb and disperse the impact force brought by stepping, improving the installation stability of the battery and reducing the risk of battery displacement and damage caused by external impact.

[0037] In practical applications, the adhesive layer 31 can be made of various materials according to specific needs and environmental conditions to achieve the best bonding strength, durability, thermal stability, and cost-effectiveness. For example: 1) Epoxy resin: Epoxy resin has high bonding strength and good heat resistance; 2) Polyurethane: Polyurethane adhesive has excellent elasticity, abrasion resistance, and chemical resistance, and can remain stable over a wide temperature range; 3) Silicone: Silicone adhesive has excellent heat resistance and weather resistance, can maintain performance under extreme temperature conditions, and has good electrical insulation properties; 4) Hot melt adhesive: Hot melt adhesive is liquid when heated and quickly solidifies after cooling to form a strong bond.

[0038] like Figure 5 As shown, a sealant strip 50 is provided in the gap between the side wall of the receiving groove 13 and the housing 21. The sealant strip 50 is provided to prevent the adhesive from overflowing into the receiving groove 13 during the curing process and affecting the normal operation of the electrical connection component 22.

[0039] Specifically, the adhesive strip 50 uses its height and position to block the flow of adhesive, preventing the formation of an "insulating layer" and ensuring the electrical continuity of the electrical connection component 22, thus avoiding circuit interruption caused by adhesive curing.

[0040] It should be noted that if the adhesive overflows into the receiving tank 13 and covers the electrical connection parts 22 (such as the top of the terminal post or the busbar connection part), the adhesive will form an "insulating isolation layer" (the adhesive layer is usually an insulating material) between the terminal post and the busbar after it solidifies, directly blocking the current conduction path and causing the battery to be unable to participate in charging and discharging normally.

[0041] The rubber-blocking strips 50 are multiple and arranged along the extension direction of the receiving groove 13; and / or, the rubber-blocking strips 50 are elongated structures. The arrangement of multiple rubber-blocking strips 50 and the design of the elongated structure increase the contact area between the rubber-blocking strips 50 and the sidewall of the receiving groove 13, thereby improving the sealing effect.

[0042] Specifically, the dense arrangement and shape design of the adhesive strips 50 form an effective physical barrier, preventing adhesive from entering the receiving tank 13, further enhancing the protection of the electrical connection component 22, and ensuring the working stability of the electrical connection component in complex environments.

[0043] It should be noted that the rubber baffle 50 has a long strip structure, including the following two structures: 1. There are multiple rubber baffles 50, and all of the multiple rubber baffles 50 have a long strip structure; 2. There is a single rubber baffle 50, and this rubber baffle 50 has a long strip structure.

[0044] The material of the sealing strip 50 can be: 1) Silicone rubber: Silicone rubber has good heat resistance, elasticity, aging resistance and electrical insulation properties, and is suitable for high-temperature environments and occasions requiring good sealing; 2) Ethylene propylene diene monomer (EPDM) rubber: EPDM rubber has excellent weather resistance, ozone resistance and electrical insulation, and can maintain stability over a wide temperature range; 3) Fluororubber: Fluororubber has extremely high heat resistance, chemical stability and electrical insulation, and can resist the erosion of most chemicals; 4) Polyurethane: Polyurethane elastomer has good wear resistance, oil resistance and mechanical strength, and also has a certain degree of elasticity; 5) Foaming materials: such as polyurethane foam, polyethylene foam, memory foam, etc. Foaming materials are lightweight and have good energy absorption and sound insulation properties.

[0045] like Figure 5 As shown, the height of the rubber baffle 50 is H1mm, 3mm≤H1mm≤12mm; and / or, the length of the rubber baffle 50 extending into the receiving groove 13 is Lmm, 1mm≤Lmm≤6mm.

[0046] The height H1 of the adhesive strip 50 and the length L of the adhesive strip 50 extending into the receiving groove 13 are set to ensure that the adhesive strip 50 can effectively block the adhesive liquid without excessively interfering with the electrical connection component 22 in the receiving groove 13.

[0047] The height H1mm of the rubber baffle strip 50 can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, or other values ​​between 3mm and 12mm.

[0048] The length Lmm of the rubber baffle strip 50 extending into the receiving groove 13 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, or other values ​​between 1mm and 6mm.

[0049] In some embodiments, an elastic buffer is provided within the receiving groove 13. A first end of the elastic buffer contacts the second bottom surface 12, and a second end contacts the electrical connection component 22 and / or the housing 21. The introduction of the elastic buffer provides additional cushioning protection for the electrical connection component 22, reducing the risk of damage caused by external impacts. The elastic buffer can absorb impact energy, reduce the stress transmitted to the electrical connection component 22, significantly improve the battery's impact resistance, and enhance the safety and reliability of the entire vehicle.

[0050] In some embodiments, the support member 30 includes a resilient support member. The use of the resilient support member provides the battery with both stable and flexible support, effectively mitigating chassis deformation caused by passenger foot traffic. The resilient support member can deform under pressure, absorbing and dispersing external forces, reducing direct impact on the battery, improving the battery's pressure resistance, and lowering the risk of damage to the battery's internal structure due to external forces.

[0051] Elastic buffers and supports typically require good elastic recovery, fatigue resistance, and appropriate hardness to effectively absorb vibrations and impacts while maintaining stable support. Here are some materials suitable for use as elastic buffers and supports: 1) Rubber: Natural or synthetic rubbers such as styrene-butadiene rubber, neoprene rubber, and EPDM rubber are common choices. Rubber has excellent elasticity, wear resistance, and chemical resistance, making it suitable for use as a buffer and support; 2) Thermoplastic elastomers: Such as thermoplastic polyurethane and thermoplastic vulcanized rubber. These materials combine the elasticity of rubber with the processability of plastics, are easy to mold and weld, and have good weather resistance and resilience; 3) Silicone rubber: Due to its excellent heat resistance and chemical stability, it maintains good elasticity even in high-temperature or chemically corrosive environments, making it an ideal material for elastic components; 4) Foamed materials: Such as polyurethane foam, polyethylene foam, and memory foam. Foamed materials are lightweight and have good energy absorption and sound insulation properties, suitable for applications requiring weight reduction or absorption of high-frequency vibrations.

[0052] Specifically, the elastic support is made of foam.

[0053] In some embodiments, the support member 30 includes a rigid support column 32. The addition of the rigid support column 32 provides more stable support for the battery 20, especially in areas requiring high load-bearing capacity. Specifically, the rigid support column 32, with its high strength and stability, directly bears the pressure generated by passengers stepping on it, protecting the battery from external forces, significantly improving the battery's pressure-bearing capacity and overall structural stability, and enhancing the vehicle's safety performance.

[0054] The rigid support column 32 can be: 1) Aluminum alloy: Aluminum alloy is lightweight, high-strength, and corrosion-resistant, making it a commonly used material in automotive parts. It provides good rigid support while reducing vehicle weight. 2) Stainless steel: Stainless steel has extremely high strength and excellent corrosion resistance. 3) Carbon fiber composite material: Carbon fiber composite material has a very high strength-to-weight ratio, is fatigue-resistant, and corrosion-resistant, making it an ideal choice for high-performance vehicle parts. Its rigidity is comparable to metals, while its weight is significantly lighter. 4) Engineering plastics: Such as polycarbonate, polyamide, polyetheretherketone, etc. These plastics have high rigidity and good chemical stability, making them suitable for non-metallic support components requiring certain mechanical properties.

[0055] It should be noted that the second end of the support member 30 is bonded to the insulating layer of the housing 21; or, the second end of the support member 30 is bonded to the surface of the housing 21. The bonding of the support member 30 to the insulating layer or the surface of the housing 21 ensures a firm connection between the support member 30 and the battery 20.

[0056] Specifically, bonding the insulation layer provides a better seal, while bonding directly to the surface of the housing 21 may provide higher bond strength.

[0057] In this embodiment, the insulating layer includes a blue film. In other embodiments, the insulating layer can also be formed by spraying an insulating coating.

[0058] It should be noted that the insulating layer is applied to the outer surface of the battery's metal casing to improve the insulation performance of the battery's outer surface. It can be applied to the outer surface of the casing by adhesive bonding or coating.

[0059] Examples of blue film (insulating film) composition: polyester film (PET, Polyethylene Terephthalate), polyimide (PI), polypropylene (PP) or polyethylene (PE).

[0060] Examples of insulating coating components: (1) modified epoxy resin; (2) polyacrylate; (3) polyethylene phthalate (PET); (4) insulating materials including oil-based insulating resin or water-based insulating resin and other main materials. The main materials of insulating resin include epoxy resin, acrylic resin, polyurethane resin, hydroxyl acrylic resin and other multifunctional resins; various additives may also be included in the insulating materials, such as photoinitiators, reactive diluents, flame retardants, wetting agents, leveling agents, defoamers, etc. The main materials and additives are mixed in a certain proportion to prepare the large insulating material for spraying. It is understandable that in order to avoid the material from flowing too quickly when sprayed onto the shell surface, the spraying material is prepared as a liquid with a certain viscosity, with the viscosity range mainly between 2000-12000cps, and the specific viscosity range of different materials is adjusted accordingly; (5) polyimide coating or insulating coating formed by polymers such as polyimide (PI) and epoxy resin; (6) styrene-butadiene rubber emulsion.

[0061] Other types of insulating layers: Alumina layer, boron nitride layer, or titanium carbide layer can also be used to replace the blue film. Layers made of the above materials have insulating properties and high temperature resistance.

[0062] like Figure 3 As shown, the distance between the first bottom surface 11 and the housing 21 is D2mm, where 5mm≤D2mm≤20mm; and / or, the height of the gap 40 is H2mm, where 1mm≤H2mm≤10mm. Setting the distance D2 between the first bottom surface 11 and the housing 21 and the height H2 of the gap 40 within the above range can balance the needs of battery fixation and shock absorption.

[0063] The distance D2mm between the first bottom surface 11 and the shell 21 can be 5mm, 10mm, 15mm, 20mm, or other values ​​between 5mm and 20mm.

[0064] The height H2mm of the gap 40 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, or other values ​​between 1mm and 10mm.

[0065] In this embodiment, the electrical connection component 22 includes a terminal post 221. By protecting the terminal post 221, the normal charging and discharging function of the battery is ensured.

[0066] like Figure 3 As shown, in some embodiments, the first bottom surface 11 is located above the shoulder 211 of the housing 21, and the second end of the support 30 contacts the shoulder 211 of the housing 21. The contact between the support 30 and the shoulder 211 of the housing 21 fully utilizes the structural strength of the housing 21 of the battery 20 and improves the load-bearing capacity of the support 30.

[0067] It should be noted that the shoulder 211 of the housing 21, as a relatively robust part, can provide a stable fulcrum for the support member 30. By fixing the support member 30 to the shoulder 211 of the housing 21, the pressure-bearing capacity of the battery 20 is enhanced, and the deformation of the battery structure caused by external forces is reduced.

[0068] Specifically, shoulder 211 refers to the portion of housing 21 located between its corner 212 and electrical connection member 22.

[0069] In some embodiments, the second end of the support member 30 is located between the electrical connection component 22 and the explosion-proof valve 23. This design, positioning the second end of the support member 30 between the electrical connection component 22 and the explosion-proof valve 23, offers several significant advantages. First, this arrangement effectively disperses the load caused by passenger footsteps, preventing the load from directly acting on the electrical connection component 22 and significantly reducing the risk of damage to the electrical connection component due to external forces, thereby enhancing the stability and safety of the battery system. Second, the explosion-proof valve 23, as a crucial safety component of the battery system, functions to release pressure when the internal pressure of the battery is too high, preventing battery explosion. Placing the second end of the support member near the explosion-proof valve indirectly protects the valve from external forces, ensuring its proper opening when necessary and improving the emergency response capability of the entire system. Furthermore, this design optimizes the internal spatial layout of the battery, making rational use of limited space resources, increasing battery energy density, while ensuring the safety and functionality of critical components.

[0070] It should be noted that the arrangement of the second end of the support member 30 being located between the electrical connection member 22 and the explosion-proof valve 23 is suitable for small battery cells. The shoulder 211 of the housing 21 is relatively narrow and is installed between the explosion-proof valve 23 and the electrical connection member 22, which increases the installation stability.

[0071] Specifically, the second end of the support member 30 is located between the pole post 221 and the explosion-proof valve 23.

[0072] Definition and Function of Explosion-proof Valves: Explosion-proof valves are components or parts that can be actuated to release internal pressure or temperature when the internal pressure or temperature of a battery cell reaches a predetermined threshold. During battery use, explosion-proof valves are mainly used to prevent excessive pressure buildup that could cause deformation or explosion in the event of thermal runaway or other situations. They allow gas to escape from the battery, thus reducing internal pressure. Materials and Composition of Explosion-proof Valves: Explosion-proof valves can be made of any material, including but not limited to aluminum, steel, and alloys. Their shape is also unrestricted, including square, oblong, elliptical, racetrack-shaped, etc. The type of explosion-proof valve is also unrestricted, such as serrated explosion-proof valves, which can be formed by stamping or laser etching.

[0073] Terminals are used to electrically connect electrodes located inside the casing to external devices (adjacent batteries or other electrical equipment) located outside the casing. The battery can discharge to external devices through the cell output terminals (tabs) and the external device output terminals (terminals), and an external power source can charge the battery through the terminals and tabs. Terminals can be directly electrically connected to the cell tabs or electrically connected to the tabs through metal adapters. Terminal assemblies are made of metals including, but not limited to, copper, aluminum, aluminum alloys, and copper-aluminum alloys.

[0074] A busbar electrically connects the terminals (current output terminals) of at least two batteries to enable series or parallel connection of multiple battery cells. Busbars are made of metals such as copper, aluminum, tungsten, and manganese, or alloys such as copper-aluminum composites, which possess excellent electrical conductivity.

[0075] The vehicle provided by the embodiments has the following beneficial effects:

[0076] (1) By introducing a support between the battery casing and the chassis, the passenger's stepping force is prevented from acting directly on the terminals and busbars, which significantly reduces the probability of damage to these sensitive components and thus improves the safety and reliability of the entire battery system.

[0077] (2) The chassis is recessed to the side away from the battery to form a receiving groove, which reasonably allocates the space between the first bottom surface and the battery, making the battery layout more compact, which helps to improve the overall energy density of the vehicle and increase the vehicle's range.

[0078] (3) The support components are made of adhesive or foam, which not only ensures the stability of the installation, but also provides a buffering effect, reducing the impact of vibration caused by road bumps or impacts on the battery and extending the battery life.

[0079] (4) A baffle strip is set around the terminal post to effectively prevent the adhesive from entering the receiving tank and covering the connection between the terminal post and the busbar, thus avoiding the formation of an "insulation isolation layer", ensuring the normal charging and discharging of the battery cell and preventing the risk of electrical short circuit or open circuit.

[0080] (5) Fixing one end of the support between the electrical connection component and the explosion-proof valve not only ensures the stability of the internal structure of the battery, but also indirectly protects the normal operation of the explosion-proof valve and enhances the battery's self-protection mechanism under abnormal conditions.

[0081] The battery in this application is a secondary battery, also known as a rechargeable battery or storage battery, which refers to a battery that can be used again after being discharged by recharging to activate the active materials.

[0082] Typically, a secondary battery includes an electrode assembly, an electrolyte, and an outer casing. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The electrode assembly and electrolyte are assembled inside the outer casing. During charging and discharging, active ions (such as lithium ions) move back and forth between the positive and negative electrodes, inserting and extracting. The separator, positioned between the positive and negative electrodes, primarily prevents short circuits while allowing active ions to pass through. The electrolyte, located between the positive and negative electrodes, mainly serves to conduct active ions.

[0083] As an example, the preparation process of a secondary battery is as follows: the positive electrode, separator, and negative electrode are stacked in sequence, with the separator acting as a separator between the positive and negative electrodes. Then, the electrodes are wound or stacked to obtain an electrode assembly. The electrode assembly is placed in an outer packaging shell, dried, and then injected with electrolyte. After vacuum sealing, settling, formation, and shaping, a secondary battery is obtained.

[0084] A positive electrode typically includes a positive current collector and a positive electrode film layer disposed on at least one side of the positive current collector. The positive electrode film layer includes a positive electrode active material, which can be any existing publicly disclosed positive electrode active material or a positive electrode active material optimized based on existing materials.

[0085] This application does not impose any particular restrictions on the type of positive electrode active material for the positive electrode sheet. As an example, the positive electrode active materials in this application include lithium-containing transition metal oxides (e.g., LiCoO2), phosphides (e.g., LiFePO4), or lithium intercalation compounds (e.g., positive electrode materials for binary lithium batteries such as lithium cobalt oxide and lithium nickel oxide, or positive electrode materials for ternary lithium batteries such as lithium nickel cobalt manganese oxide and lithium nickel cobalt aluminum oxide).

[0086] In some embodiments, the positive electrode sheet can be prepared by dispersing the above-mentioned components for preparing the positive electrode sheet, such as positive electrode active material, conductive agent, binder and any other components, in a solvent (e.g., N-methylpyrrolidone) to form a positive electrode slurry; coating the positive electrode slurry onto the positive electrode current collector, and then obtaining the positive electrode sheet after drying, rolling, cutting and other processes.

[0087] In this application, the binder is used to improve the adhesion between positive electrode active material particles and the adhesion between the positive electrode active material and the current collector. This application does not impose any particular limitation on the type of binder for the positive electrode sheet; the binder can be any conventional choice in the battery industry. Specifically, the binder can be at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyvinyl alcohol (PVA), styrene-butadiene rubber (SBR), polyacrylonitrile (PAN), polyimide (PI), polyacrylic acid (PAA), polyacrylate, polyolefin, sodium carboxymethyl cellulose (CMC), or sodium alginate.

[0088] This application does not impose any particular restrictions on the positive electrode current collector, as long as it is conductive and will not cause adverse chemical changes in the battery, and can be made of, for example: stainless steel, aluminum, nickel, titanium, sintered carbon; or aluminum or stainless steel that has been surface treated with one of carbon, nickel, titanium, silver, etc.

[0089] The negative electrode includes a negative electrode current collector and a negative electrode active material layer disposed on at least one side of the negative electrode current collector. The negative electrode active material layer comprises a silicon-based material. This application does not specifically limit the type of silicon-based material; the silicon-based material can be a silicon-carbon material and / or a silicon-oxygen material. As an example, the silicon-based material can be one or more of silicon-carbon composite negative electrode materials, silicon suboxide negative electrode materials, modified silicon suboxide negative electrode materials, and nano-silicon materials. The negative electrode active material in the negative electrode active material layer may also optionally include one or more of artificial graphite, natural graphite, and hard carbon.

[0090] In some embodiments, the negative electrode sheet can be prepared by dispersing the components used to prepare the negative electrode sheet, such as the negative electrode active material, conductive agent, binder and any other components, in a solvent (e.g., water) to form a negative electrode slurry; coating the negative electrode slurry onto the negative electrode current collector, and then obtaining the negative electrode sheet after drying, rolling, cutting and other processes.

[0091] This application does not specifically limit the type of negative electrode conductive agent. In some embodiments, as an example, the negative electrode conductive agent can be one or more of conventional negative electrode conductive agents such as acetylene black and carbon nanotubes.

[0092] This application does not specifically limit the type of negative electrode binder. In some embodiments, as an example, the binder can be one or more of conventional negative electrode binders such as styrene-butadiene rubber latex (SBR), polyvinylidene fluoride (PVDF), polyacrylic acid (PAA), and sodium carboxymethyl cellulose (CMC). In this application, the binder is preferably PAA, SBR, and CMC, and the mass ratio of PAA, SBR, and CMC can be (34.38-74.29):(20-59.38):(5-7.14).

[0093] This application does not impose specific limitations on the type of negative electrode current collector. In some embodiments, as an example, the negative electrode current collector can be one of the conventional negative electrode current collectors such as copper foil.

[0094] The electrolyte acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. As an example, the electrolyte in this application can be any electrolyte suitable for electrochemical energy storage devices in the art. The electrolyte includes an electrolyte and a solvent; the electrolyte typically includes a lithium salt, and additives may also be added to the electrolyte.

[0095] Specifically, the lithium salt includes at least one selected from lithium hexafluorophosphate (LiPF6), lithium tetrafluoroborate (LiBF4), lithium perchlorate (LiClO4), lithium hexafluoroarsenate (LiAsF6), lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium trifluoromethanesulfonate (LiTFS), lithium difluorooxalate borate (LiDFOB), lithium dioxalate borate (LiBOB), lithium difluorophosphate (LiPO2F2), lithium difluorodioxalate phosphate (LiDFOP), and lithium tetrafluorooxalate phosphate (LiTFOP). The concentration of the electrolyte in the electrolyte solution can be 0.5–5 mol / L.

[0096] Specifically, the solvent includes at least one of ethylene carbonate (EC), propylene carbonate (PC), methyl ethyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), butyl carbonate (BC), fluoroethylene carbonate (FEC), methyl formate (MF), methyl acetate (MA), ethyl acetate (EA), propyl acetate (PA), methyl propionate (MP), ethyl propionate (EP), propyl propionate (PP), methyl butyrate (MB), ethyl butyrate (EB), 1,4-butyrolactone (GBL), sulfolane (SF), dimethyl sulfone (MSM), methyl ethyl sulfone (EMS), and diethyl sulfone (ESE).

[0097] In some implementations, as an example, the additive may be a conventional electrolyte additive such as fluoroethylene carbonate (FEC), chloroethylene carbonate (CEC), or vinylene carbonate (VC).

[0098] In some embodiments, the secondary battery also includes a separator. This application does not impose any particular limitation on the type of separator; any known porous separator with good chemical and mechanical stability can be selected.

[0099] In some embodiments, as an example, the diaphragm can be one of PP, PE, or PP / PF; the diaphragm can also be a structure in which a coating is formed on the surface of the base film, wherein the base film coating can be one of PP, PE, or PP / PF, and the coating can be an inorganic coating and / or an organic coating. The inorganic coating can be selected from alumina ceramic layers, osmium silicate, etc., and the organic coating can be selected from PVDF, etc.

[0100] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0101] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0102] In the description of this utility model, it should be understood that "multiple" means two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0103] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0104] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model.

[0105] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A vehicle, characterized in that, The vehicle includes a chassis (10) and a battery (20). The chassis (10) has a first bottom surface (11) and a second bottom surface (12). The first bottom surface (11) is located above the housing (21) of the battery (20), and the second bottom surface (12) is located above the electrical connection component (22) of the battery (20). A support member (30) is provided between the first bottom surface (11) and the housing (21). The first end of the support member (30) contacts the first bottom surface (11), and the second end of the support member (30) contacts the housing (21). There is a gap (40) between the second bottom surface (12) and the electrical connection component (22).

2. The vehicle according to claim 1, characterized in that, The chassis (10) has a receiving groove (13) on the side facing the battery (20), at least part of the electrical connection component (22) is located in the receiving groove (13), the bottom wall of the receiving groove (13) is the second bottom surface (12), the first bottom surface (11) is located outside the receiving groove (13), and the distance between the first bottom surface (11) and the housing (21) is less than the distance between the second bottom surface (12) and the housing (21).

3. The vehicle according to claim 2, characterized in that, The distance between the electrical connection component (22) and the side wall of the receiving groove (13) is D1mm, where 5mm≤D1mm≤30mm.

4. The vehicle according to claim 2, characterized in that, The support member (30) includes an adhesive layer (31), the first end of which is bonded to the first bottom surface (11), and the second end of which is bonded to the housing (21).

5. The vehicle according to claim 2, characterized in that, A rubber-blocking strip (50) is provided in the gap between the side wall of the receiving groove (13) and the housing (21).

6. The vehicle according to claim 5, characterized in that, There are multiple adhesive strips (50), and the multiple adhesive strips (50) are arranged along the extension direction of the receiving groove (13).

7. The vehicle according to claim 5, characterized in that, The rubber-blocking strip (50) has a long strip structure.

8. The vehicle according to claim 5, characterized in that, The height of the rubber baffle strip (50) is H1mm, and 3mm≤H1mm≤12mm.

9. The vehicle according to claim 5, characterized in that, The length of the rubber-blocking strip (50) extending into the receiving groove (13) is Lmm, where 1mm≤Lmm≤6mm.

10. The vehicle according to claim 2, characterized in that, An elastic buffer is provided in the receiving groove (13). The first end of the elastic buffer is in contact with the second bottom surface (12), and the second end of the elastic buffer is in contact with the electrical connection component (22) and / or the housing (21).

11. The vehicle according to any one of claims 1 to 10, characterized in that, The support member (30) includes an elastic support member.

12. The vehicle according to any one of claims 1 to 10, characterized in that, The support member (30) includes a rigid support column (32).

13. The vehicle according to any one of claims 1 to 10, characterized in that, The second end of the support member (30) is bonded to the insulating layer of the housing (21).

14. The vehicle according to any one of claims 1 to 10, characterized in that, The second end of the support member (30) is bonded to the surface of the housing (21).

15. The vehicle according to any one of claims 1 to 10, characterized in that, The distance between the first bottom surface (11) and the shell (21) is D2mm, where 5mm≤D2mm≤20mm.

16. The vehicle according to any one of claims 1 to 10, characterized in that, The height of the gap (40) is H2mm, and 1mm≤H2mm≤10mm.

17. The vehicle according to any one of claims 1 to 10, characterized in that, The electrical connection component (22) includes a pole (221).

18. The vehicle according to any one of claims 1 to 10, characterized in that, The first bottom surface (11) is located above the shoulder (211) of the housing (21), and the second end of the support (30) is in contact with the shoulder (211) of the housing (21).

19. The vehicle according to any one of claims 1 to 10, characterized in that, The second end of the support member (30) is located between the electrical connection component (22) and the explosion-proof valve (23).

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