Box assembly, battery pack and electric device

Abstract

The utility model provides a kind of box assembly, battery pack and electric device, box assembly includes: box and plate body. Box has the accommodating cavity for accommodating battery pack, box includes bottom wall and the side wall being connected with bottom wall, bottom wall and side wall are integrally formed structure. Plate body is stacked with bottom wall. Among them, the surface of bottom wall towards plate body and / or the surface of plate body towards bottom wall is provided with recess, to form heat exchange flow channel between bottom wall and plate body. The technical scheme of the application effectively solves the problem that the weight of the battery pack is relatively heavy due to the separate design and processing of the box and liquid cooling plate in the related art.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a housing assembly, a battery pack, and an electrical device. Background Technology

[0002] In new energy vehicles and other high-energy-density energy storage systems, the battery pack is a core component, and its performance and reliability are directly related to the safety and efficiency of the entire system.

[0003] The battery pack in the relevant technology includes a battery pack, a liquid cooling plate, and a housing, with both the battery pack and the liquid cooling plate housed within the housing. The battery pack is used for energy storage. The liquid cooling plate contains coolant channels and is responsible for cooling the battery pack to ensure it operates at a suitable temperature. The housing provides physical encapsulation for the battery pack, protecting it from external environmental damage. The housing provides necessary safety protection for the battery pack in the event of external impacts or other accidents.

[0004] In related technologies, the battery pack housing and liquid cooling plate are two separately manufactured structures, designed and produced independently, and then assembled together. However, the separate design and manufacturing of the housing and liquid cooling plate significantly increases the overall weight of the battery pack. Specifically, both the housing and liquid cooling plate have a certain thickness and strength to meet their specific functional requirements, which makes the battery pack heavier and hinders its weight reduction. Utility Model Content

[0005] The main purpose of this utility model is to provide a housing assembly, a battery pack, and an electrical device to solve the problem in related technologies where the housing and liquid cooling plate are designed and manufactured separately, resulting in a heavy battery pack.

[0006] To achieve the above objectives, according to one aspect of the present invention, a housing assembly is provided for accommodating a battery pack. The housing assembly includes a housing and a plate. The housing has a receiving cavity for accommodating the battery pack. The housing includes a bottom wall and a side wall connected to the bottom wall. The bottom wall and the side wall are integrally formed. The plate and the bottom wall are stacked. A groove is provided on the surface of the bottom wall facing the plate and / or on the surface of the plate facing the bottom wall to form a heat exchange channel between the bottom wall and the plate.

[0007] According to another aspect of the present invention, a battery pack is provided, including a battery pack and a housing assembly, wherein the housing assembly is the aforementioned housing assembly, and the battery pack is disposed within the housing assembly.

[0008] According to another aspect of the present invention, an electrical device is provided, including a battery pack, wherein the battery pack is the aforementioned battery pack.

[0009] Applying the above technical solution, a groove is provided on at least one of the bottom wall and the plate, and a heat exchange channel is formed between the bottom wall and the plate of the housing. Through integrated processing of the bottom wall and the plate, a heat exchange channel is formed between them, resulting in a two-layer structure at the bottom of the housing assembly (i.e., bottom wall and plate). The heat exchange channel formed by the bottom wall and the plate enables heat exchange with the battery pack, allowing it to operate at a suitable temperature. The bottom wall and plate also support the battery pack and physically encapsulate it, protecting it from external environmental damage. Compared to the separate design of the housing and liquid cooling plate in related technologies, this reduces the number of plates used for the housing and liquid cooling plate, thereby reducing the weight of the housing assembly and the battery pack, achieving a lightweight battery pack. Therefore, the technical solution of this application effectively solves the problem of the heavy battery pack caused by the separate design and processing of the housing and liquid cooling plate in related technologies. Furthermore, by designing the bottom and side walls as a single molded structure, the structural strength of the enclosure is improved; the number of connecting parts between the bottom and side walls is reduced, thus reducing the weight of the enclosure; the gaps between the bottom and side walls are reduced, thus improving the sealing performance of the enclosure; and the enclosure is easier to process, thus improving production efficiency and reducing costs. Attached Figure Description

[0010] 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:

[0011] Figure 1 A perspective structural schematic diagram of an embodiment of the battery pack according to the present invention is shown;

[0012] Figure 2 It shows Figure 1 A cross-sectional schematic diagram of one embodiment of the battery pack;

[0013] Figure 3 It shows Figure 2 A partial enlarged view of point A in one embodiment of the battery pack;

[0014] Figure 4 It shows Figure 1 A schematic diagram of the structure of one embodiment of the battery pack;

[0015] Figure 5 It shows Figure 1 A schematic diagram of another embodiment of the battery pack;

[0016] Figure 6 It shows Figure 1 A schematic diagram of the structure of another embodiment of the battery pack;

[0017] Figure 7 It shows Figure 1 A cross-sectional schematic diagram of another embodiment of the battery pack;

[0018] Figure 8 It shows Figure 7 A partial enlarged view of point B in an embodiment of the battery pack.

[0019] The above figures include the following reference numerals:

[0020] 10. Box body; 11. Bottom wall; 12. Side wall; 13. Receiving cavity;

[0021] 20. Plate body;

[0022] 30. Groove;

[0023] 40. Buffer layer;

[0024] 50. Thermally conductive adhesive layer;

[0025] 60. Battery pack. 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] 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.

[0028] 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 merely exemplary 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.

[0029] In one embodiment according to this application, such as Figures 1 to 4 As shown, a housing assembly is provided for accommodating a battery pack 60. The housing assembly includes a housing 10 and a plate 20. The housing 10 has a receiving cavity 13 for accommodating the battery pack 60. The housing 10 includes a bottom wall 11 and a side wall 12 connected to the bottom wall 11, and the bottom wall 11 and the side wall 12 are integrally formed. The plate 20 is stacked on top of the bottom wall 11. Grooves 30 are provided on the surface of the bottom wall 11 facing the plate 20 and / or on the surface of the plate 20 facing the bottom wall 11, so that a heat exchange channel is formed between the bottom wall 11 and the plate 20.

[0030] Using the above technical solution, the groove 30 is disposed on at least one of the bottom wall 11 and the plate 20, and the heat exchange channel is formed between the bottom wall 11 and the plate 20 of the housing 10. Through integrated processing of the bottom wall 11 and the plate 20, a heat exchange channel is formed between them, resulting in a two-layer structure at the bottom of the housing assembly (i.e., bottom wall 11 and plate 20). The heat exchange channel formed by the bottom wall 11 and the plate 20 enables heat exchange with the battery pack 60, allowing the battery pack 60 to operate at a suitable temperature. The bottom wall 11 and the plate 20 support the battery pack 60 and also allow the housing 10 to physically encapsulate the battery pack 60, protecting it from external environmental damage. Compared to the traditional separate design of the housing 10 and the liquid cooling plate, this design reduces the number of plates used in the housing 10 and the liquid cooling plate, thereby reducing the weight of the housing assembly and the battery pack, achieving a lightweight battery pack. Therefore, the technical solution of this embodiment effectively solves the problem in related technologies where the separate design and processing of the housing 10 and the liquid cooling plate results in a heavy battery pack. Furthermore, by designing the bottom wall 11 and side wall 12 as an integrally formed structure, the structural strength of the housing 10 is improved; the number of connecting parts between the bottom wall 11 and side wall 12 is reduced, thus lowering the weight of the housing 10; the gaps between the bottom wall 11 and side wall 12 are reduced, improving the sealing performance of the housing 10; and the processing of the housing 10 is facilitated, increasing production efficiency and reducing costs.

[0031] The inventors discovered that the liquid cooling plate in the related technology includes a first plate and a second plate, with a cooling channel formed between the first and second plates. The liquid cooling plate is disposed on the bottom wall of the housing. Thus, the bottom wall of the housing and the liquid cooling plate together consist of three layers, resulting in a relatively heavy overall weight for the housing and liquid cooling plate, which is detrimental to the lightweight design of the battery pack.

[0032] By applying the technical solution of the above embodiment, the plate 20 is connected to the bottom wall 11 of the housing 10, so that the total number of plates 20 at the bottom of the housing assembly (equivalent to the total number of bottom walls 11 of the housing 10 and the liquid cooling plate 20 in the related technology) is two layers. Compared with the prior art, the use of plates is reduced and the first plate 20 in the related technology is eliminated, thereby making the total weight of the housing assembly lighter, which is beneficial to the lightweight design of the battery pack.

[0033] Furthermore, in other embodiments, the groove 30 is disposed on the bottom wall 11 and also on the plate 20. When the bottom wall 11 and the plate 20 are stacked, the groove 30 on the bottom wall 11 communicates with the groove 30 on the plate 20 and forms a heat exchange channel.

[0034] Preferably, the housing 10 is made of a metal material, such as aluminum or steel. Alternatively, the housing 10 is made of a composite material. The housing 10 is integrally formed by stamping.

[0035] Furthermore, when the groove 30 is provided on the bottom wall 11, the relationship between the depth H1 of the groove 30 on the bottom wall 11 and the thickness D1 of the bottom wall 11 satisfies: 0.03≤H1 / D1≤33.33, and more preferably, 0.4≤H1 / D1≤33.33. By limiting the ratio of the depth H1 of the groove 30 on the bottom wall 11 to the thickness D1 of the bottom wall 11 when the groove 30 is provided on the bottom wall 11, the smoothness of the heat exchange fluid in the heat exchange channel is ensured, thereby guaranteeing the cooling efficiency. At the same time, the problem of poor structural strength of the bottom wall 11 due to the setting of the groove 30 is avoided. By limiting the above ratio, the heat dissipation performance and structural strength are balanced. When the groove 30 is provided on the plate 20, the relationship between the depth H2 of the groove 30 on the plate 20 and the thickness D2 of the plate 20 satisfies: 0.002≤H2 / D2<1. More preferably, when the groove 30 is provided on the plate 20, the relationship between the depth H2 of the groove 30 on the plate 20 and the thickness D2 of the plate 20 satisfies: 0.1≤H2 / D2≤0.9. By limiting the ratio of the depth H2 of the groove 30 on the plate 20 to the thickness D2 of the plate 20 when the groove 30 is provided on the plate 20, the smoothness of the heat exchange fluid in the heat exchange channel is ensured, thereby guaranteeing the cooling efficiency. At the same time, it avoids the problem of poor structural strength of the plate due to the groove. By limiting the above ratio, heat dissipation performance and structural strength are balanced.

[0036] Preferably, H1 / D1 is 0.03, 0.05, 0.07, 0.09, 0.11, 0.13, 0.15, 0.17, 0.19, 0.21, 0.23, 0.25, 0.27, 0.29, 0.31, 0.33, 0.35, 0.37, 0.39, 0.4, 0.83, 2.23, 5.03, 7.83, 10.53, 15.33, 17.73, 20.13, 23.73, 26.13, 30.93, or 33.33.

[0037] Preferably, H2 / D2 is 0.002, 0.052, 0.102, 0.152, 0.202, 0.252, 0.302, 0.352, 0.402, 0.452, 0.502, 0.552, 0.602, 0.652, 0.702, 0.752, 0.802, 0.852, 0.902, 0.952, or 0.99.

[0038] More preferably, the H2 / D2 ratio is 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.9.

[0039] In other embodiments, when the groove 30 is provided on the bottom wall 11, the relationship between the depth H1 of the groove 30 on the bottom wall 11 and the thickness D1 of the bottom wall 11 satisfies: 0.03 ≤ H1 / D1 ≤ 33.33. Alternatively, when the groove 30 is provided on the plate 20, the relationship between the depth H2 of the groove 30 on the plate 20 and the thickness D2 of the plate 20 satisfies: 0.002 ≤ H2 / D2 < 1.

[0040] Furthermore, when the groove 30 is provided on the bottom wall 11, the relationship between the depth H1 of the groove 30 on the bottom wall 11 and the thickness D1 of the bottom wall 11 satisfies: 0.4 ≤ H1 / D1 ≤ 33.33. By limiting the ratio of the depth H1 of the groove 30 on the bottom wall 11 to the thickness D1 of the bottom wall 11 when the groove 30 is provided on the bottom wall 11, the smoothness of the heat exchange fluid in the heat exchange channel is ensured, thereby guaranteeing the cooling efficiency, while also avoiding the problem of poor structural strength of the bottom wall due to the setting of the groove. By limiting the above ratio, heat dissipation performance and structural strength are further balanced.

[0041] It should be noted that the bottom wall 11 has a first surface and a second surface disposed opposite to each other, and the groove 30 penetrates through the first surface. The groove 30 has an opening disposed on the first surface and a bottom surface disposed opposite to the opening. The depth H1 of the groove 30 on the bottom wall 11 refers to the maximum distance between the first surface and the bottom surface. The thickness D1 of the bottom wall 11 refers to the maximum distance between the first surface and the second surface.

[0042] It should be noted that the plate 20 has a third surface and a fourth surface arranged opposite to each other, and the groove 30 penetrates the third surface. The groove 30 has an opening on the third surface and a bottom surface arranged opposite to the opening. The depth H2 of the groove 30 on the plate 20 refers to the maximum distance between the third surface and the bottom surface. The thickness D2 of the plate 20 refers to the maximum distance between the third surface and the fourth surface.

[0043] In the above embodiments, such as Figures 2 to 4 As shown, the plate 20 is located below the bottom wall 11. This facilitates the connection between the plate 20 and the bottom wall 11 and makes processing easier. Furthermore, the plate 20 can be made of a different material than the bottom wall 11, allowing the plate 20 to provide some protection for the casing 10, improving the impact resistance of the bottom of the casing 10, and enhancing the safety of the battery pack.

[0044] In the above embodiments, such as Figures 2 to 4As shown, the thickness D2 of the plate 20 satisfies: 0.2mm ≤ D2 ≤ 50mm. By limiting the thickness range of the plate 20, when the plate 20 is located below the bottom wall 11, it can protect the bottom wall 11 of the housing 10, improving the impact resistance of the bottom of the housing 10 and enhancing the safety of the battery pack. The plate 20 has a multi-layer plate structure. The multi-layer plate structure improves the impact resistance of the plate 20 while reducing its weight. This allows the housing assembly to maintain sufficient structural strength while achieving lightweighting and impact resistance, thus achieving the lightweighting goal without affecting the safety of the battery pack 60 and the overall performance of the battery pack.

[0045] Preferably, the thickness D2 of the plate 20 is 0.2mm, 1mm, 2mm, 5mm, 7mm, 9mm, 11mm, 13mm, 16mm, 20mm, 24mm, 28mm, 32mm, 36mm, 40mm, 44mm, 48mm, or 50mm.

[0046] It should be noted that the plate 20 has a third surface and a fourth surface that are arranged opposite to each other. The thickness D2 of the plate 20 refers to the maximum distance between the third surface and the fourth surface.

[0047] In the above embodiments, the multilayer plate structure includes a first surface plate, a second surface plate, and a core plate disposed between the first and second surface plates. Preferably, the core plate has a honeycomb structure to reduce the weight of the multilayer plate structure. Preferably, the multilayer plate structure is a sandwich plate or a honeycomb plate. The multilayer plate structure is made of composite materials. Preferably, the multilayer plate structure is made of carbon fiber composite material, high-strength aluminum-based composite material, resin-based composite material, or other high-performance composite materials. That is, the plate body 20 is a composite plate, and because the composite plate is lighter, it is beneficial to the lightweighting of the battery pack.

[0048] In other embodiments, the thickness D2 of the plate 20 satisfies: 0.2mm ≤ D2 ≤ 50mm. Alternatively, the plate 20 may be a multilayer board structure.

[0049] In the above embodiments, such as Figures 2 to 4 As shown, the groove 30 is provided on the plate 20, and the groove 30 and the bottom wall 11 form a heat exchange channel. This facilitates the processing of the groove 30 on the plate 20, simplifies the processing steps of the bottom wall 11, and thus reduces the processing cost.

[0050] Figure 5 The illustrated embodiments and Figures 6 to 8 The illustrated embodiment differs from the above embodiment in that the relative positions of the plate 20 and the bottom wall 11 are different. For example... Figures 5 to 8As shown, the plate 20 is located between the battery pack 60 and the bottom wall 11. This allows the plate 20 to be located within the housing cavity 13 of the housing 10, reducing the impact of external impacts on the plate 20, lowering the impact resistance requirements of the plate 20, and allowing the plate 20 to be made of a material with better thermal conductivity, thereby improving heat exchange efficiency.

[0051] In other embodiments, such as Figures 5 to 8 As shown, the housing assembly also includes a buffer layer 40, which is disposed on the surface of the bottom wall 11 facing away from the receiving cavity 13. The buffer layer 40, disposed on the surface of the bottom wall 11 facing away from the receiving cavity 13, further enhances the housing assembly's ability to buffer and absorb external impacts, improves the housing assembly's resistance to ball impacts, and especially enhances the safety of the battery pack 60 during vehicle operation, particularly in the face of bumps and collisions.

[0052] In other embodiments, the buffer layer 40 is preferably a PVC (polyvinyl chloride) coating, which is easy to process and has good wear resistance, water resistance and elasticity.

[0053] exist Figure 5 In the illustrated embodiment, the groove 30 is disposed on the plate 20, and the groove 30 and the bottom wall 11 form a heat exchange channel. This facilitates the processing of the groove 30 on the plate 20, simplifies the processing steps of the bottom wall 11, and thus reduces processing costs.

[0054] exist Figures 6 to 8 In the illustrated embodiment, the groove 30 is disposed on the bottom wall 11, and the groove 30 and the plate 20 form a heat exchange channel. This allows the plate 20 to be made thinner, thereby improving the thermal conductivity of the plate 20 and increasing the heat exchange efficiency of the housing assembly to the battery pack 60.

[0055] This application also provides a battery pack, such as Figure 1 As shown, the battery pack includes a battery pack 60 and a housing assembly, wherein the housing assembly is the aforementioned housing assembly, and the battery pack 60 is disposed within the housing assembly. Because the aforementioned housing assembly solves the problem of the battery pack being too heavy due to the separate design and fabrication of the housing 10 and liquid cooling plate in related technologies, the battery pack with this housing assembly can solve the same technical problem.

[0056] exist Figure 4 In the illustrated embodiment, the battery pack further includes a thermally conductive adhesive layer 50, which is located between the battery pack 60 and the bottom wall 11 when the plate 20 is located below the bottom wall 11. This placement of the thermally conductive adhesive layer 50 between the battery pack 60 and the bottom wall 11 improves the heat transfer efficiency between the battery pack 60 and the heat exchange channels, thereby enhancing the heat exchange performance of the battery pack 60.

[0057] exist Figures 6 to 8In the illustrated embodiment, the battery pack further includes a thermally conductive adhesive layer 50. When the plate 20 is located between the battery pack 60 and the bottom wall 11, the thermally conductive adhesive layer 50 is located between the plate 20 and the battery pack 60. Thus, by placing the thermally conductive adhesive layer 50 between the battery pack 60 and the plate 20, the heat transfer efficiency between the battery pack 60 and the heat exchange channel is improved, thereby enhancing the heat exchange performance of the battery pack 60.

[0058] Preferably, the thermally conductive adhesive layer 50 is a thermally conductive structural adhesive layer.

[0059] This application also provides an electrical device including a battery pack, which is the aforementioned battery pack. Because the aforementioned battery pack solves the problem of the battery pack being too heavy due to the separate design and fabrication of the housing 10 and the liquid cooling plate in related technologies, the electrical device having this battery pack can solve the same technical problem.

[0060] The following description is provided to enable those skilled in the art to fully understand this application and is not intended to limit the subject matter of the claims.

[0061] Battery:

[0062] 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.

[0063] 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.

[0064] 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.

[0065] Positive electrode tablets:

[0066] 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.

[0067] 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).

[0068] 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.

[0069] 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.

[0070] 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.

[0071] negative electrode sheet

[0072] 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.

[0073] 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.

[0074] 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.

[0075] This application does not impose specific restrictions on the type of negative electrode binder. In some embodiments, as an example, the binder may 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 may be (34.38-74.29):(20-59.38):(5-7.14).

[0076] 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.

[0077] Electrolyte:

[0078] 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.

[0079] 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.

[0080] 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).

[0081] 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).

[0082] Diaphragm:

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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 cannot be construed as limiting the scope of protection of this utility model.

[0088] 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 housing assembly for accommodating a battery pack (60), characterized in that, The enclosure assembly includes: The housing (10) has a receiving cavity (13) for accommodating the battery pack (60). The housing (10) includes a bottom wall (11) and a side wall (12) connected to the bottom wall (11). The bottom wall (11) and the side wall (12) are integrally formed. The plate (20) is stacked with the bottom wall (11); The bottom wall (11) facing the plate (20) and / or the plate (20) facing the bottom wall (11) are provided with grooves (30) so that a heat exchange channel is formed between the bottom wall (11) and the plate (20).

2. The housing assembly according to claim 1, characterized in that, When the groove (30) is provided on the bottom wall (11), the relationship between the depth H1 of the groove (30) on the bottom wall (11) and the thickness D1 of the bottom wall (11) satisfies: 0.03 ≤ H1 / D1 ≤ 33.33; and / or, When the groove (30) is provided on the plate (20), the relationship between the depth H2 of the groove (30) on the plate (20) and the thickness D2 of the plate (20) satisfies: 0.002≤H2 / D2<1.

3. The housing assembly according to claim 2, characterized in that, When the groove (30) is provided on the bottom wall (11), the relationship between the depth H1 of the groove (30) on the bottom wall (11) and the thickness D1 of the bottom wall (11) satisfies: 0.4≤H1 / D1≤33.

33.

4. The housing assembly according to claim 1, characterized in that, The plate (20) is located below the bottom wall (11).

5. The housing assembly according to claim 4, characterized in that, The thickness D2 of the plate (20) satisfies: 0.2mm ≤ D2 ≤ 50mm; and / or, The plate (20) is a multi-layer plate structure.

6. The housing assembly according to claim 4, characterized in that, The groove (30) is disposed on the plate (20), and the groove (30) and the bottom wall (11) form the heat exchange channel.

7. The housing assembly according to claim 1 or 2, characterized in that, The plate (20) is located between the battery pack (60) and the bottom wall (11).

8. The housing assembly according to claim 7, characterized in that, The housing assembly also includes a buffer layer (40) disposed on the surface of the bottom wall (11) opposite to the receiving cavity (13).

9. The housing assembly according to claim 7, characterized in that, The groove (30) is disposed on the plate (20), and the groove (30) and the bottom wall (11) form the heat exchange channel.

10. The housing assembly according to claim 7, characterized in that, The groove (30) is disposed on the bottom wall (11), and the groove (30) and the plate (20) form the heat exchange channel.

11. A battery pack, comprising a battery pack (60) and a housing assembly, characterized in that, The housing assembly is the housing assembly according to any one of claims 1 to 10, and the battery pack (60) is disposed within the housing assembly.

12. The battery pack according to claim 11, characterized in that, The battery pack also includes a thermally conductive adhesive layer (50); When the plate (20) is located below the bottom wall (11), the thermally conductive adhesive layer (50) is located between the battery pack (60) and the bottom wall (11); or, When the plate (20) is located between the battery pack (60) and the bottom wall (11), the thermally conductive adhesive layer (50) is located between the plate (20) and the battery pack (60).

13. An electrical device comprising a battery pack, characterized in that, The battery pack is the battery pack described in claim 11 or 12.

Images