Battery pack and electric device with same

Abstract

The utility model provides a kind of battery pack and the electric device with it, the battery pack includes box, upper cover and electric core subassembly, upper cover covers and is located on box, electric core subassembly is set in box, electric core subassembly includes electric core and wire harness collection piece, wire harness collection piece is electrically connected with electric core and is located above electric core;Wherein, the battery pack further includes reinforcing plate, reinforcing plate is connected with box and is located above wire harness collection piece, the lower surface of reinforcing plate has to avoid slot, at least part wire harness collection piece is located in avoid slot, and there is interval between the top wall of avoid slot and the upper surface of wire harness collection piece.The technical scheme provided in the present application can solve the problem of wear and tear between the upper cover and the wire harness collection piece in the related art.

Description

Technical Field

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

[0002] CTP (Cell-to-Pack) technology is a battery integration solution that eliminates the assembly process of traditional battery modules, directly integrating the cells into the battery pack. This design effectively reduces the number of internal components of the battery pack, simplifies the structure, and thus improves the space utilization of the battery pack. It can accommodate more cells in a limited space, increase the energy density of the battery pack, and improve the vehicle's driving range.

[0003] In related technologies, CTP (Cell-to-Pack) technology integrates the battery pack cover with the vehicle floor. However, when passengers step on the battery pack cover, wear can easily occur between the cover and the wiring harness acquisition unit. If the wiring harness acquisition unit is damaged due to wear, it may cause electrical connection failures, affecting the battery pack management system's accurate monitoring of battery status and posing a safety hazard. Utility Model Content

[0004] This utility model provides a battery pack and an electrical device having the same, to solve the problem of easy wear and tear between the top cover and the wiring harness in related technologies.

[0005] According to one aspect of the present invention, a battery pack is provided, the battery pack including a housing, a top cover, and a cell assembly. The top cover is disposed on the housing, and the cell assembly is disposed inside the housing. The cell assembly includes a cell and a wiring harness acquisition component, the wiring harness acquisition component being electrically connected to the cell and located above the cell. The battery pack also includes a reinforcing plate, which is connected to the housing and located above the wiring harness acquisition component. The lower surface of the reinforcing plate has a clearance groove, at least a portion of the wiring harness acquisition component is located within the clearance groove, and the top wall of the clearance groove is spaced from the upper surface of the wiring harness acquisition component.

[0006] According to another aspect of the present invention, an electrical device is provided, which includes a battery pack, the battery pack being the one provided above.

[0007] The above-mentioned technical solution has the following advantages: by setting a reinforcing plate between the wire harness acquisition component and the top cover, the clearance groove on the lower surface of the reinforcing plate can avoid the wire harness acquisition component. Furthermore, since there is a gap between the top wall of the clearance groove and the upper surface of the wire harness acquisition component, the reinforcing plate can protect the wire harness acquisition component when the passenger steps on the top cover, avoiding wear between the top cover and the wire harness acquisition component, thereby preventing the wire harness acquisition component from being damaged due to wear, and thus avoiding electrical connection failures. 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 battery pack provided in an embodiment of the present invention is shown;

[0010] Figure 2 A partially enlarged view of the battery pack provided in an embodiment of the present invention is shown;

[0011] Figure 3 A partial exploded view of the battery pack provided in an embodiment of the present invention is shown;

[0012] Figure 4 This is a partially enlarged view from another perspective of the battery pack provided in an embodiment of the present invention;

[0013] Figure 5 A partial exploded view of another battery pack provided in an embodiment of the present invention is shown;

[0014] Figure 6 This is a partially enlarged view of the battery pack provided in an embodiment of the present invention.

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

[0016] 10. Container body; 11. Container main body; 12. Cold plate;

[0017] 20. Battery cell assembly; 21. Wiring harness acquisition unit; 211. FPC;

[0018] 30. Reinforcing plate; 31. Clearance groove; 32. Connecting section; 321. First opening; 3211. Sub-opening; 322. First rib; 323. Second rib; 33. Protective section; 34. Glue layer; 35. Buffer pad; 351. Second opening. Detailed Implementation

[0019] 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.

[0020] like Figures 1 to 6As shown, this embodiment of the present invention provides a battery pack, which includes a housing 10, a top cover, and a cell assembly 20. The top cover is disposed on the housing 10, and the cell assembly 20 is disposed inside the housing 10. The cell assembly 20 includes a cell and a wiring harness collection component 21, which is electrically connected to the cell and located above the cell. The battery pack also includes a reinforcing plate 30, which is connected to the housing 10 and located above the wiring harness collection component 21. The lower surface of the reinforcing plate 30 has a clearance groove 31, and at least a portion of the wiring harness collection component 21 is located within the clearance groove 31. A gap exists between the top wall of the clearance groove 31 and the upper surface of the wiring harness collection component 21.

[0021] Using the battery pack provided in this embodiment, a reinforcing plate 30 is provided between the wire harness acquisition component 21 and the top cover. The clearance groove 31 on the lower surface of the reinforcing plate 30 can avoid direct contact between the reinforcing plate 30 and the wire harness acquisition component 21. Furthermore, since there is a gap between the top wall of the clearance groove 31 and the upper surface of the wire harness acquisition component 21, the reinforcing plate 30 can protect the wire harness acquisition component 21 when a passenger steps on the top cover, preventing wear between the top cover and the wire harness acquisition component 21, thereby preventing damage to the wire harness acquisition component 21 due to wear and thus preventing electrical connection failures.

[0022] Furthermore, in related technologies, if foam is added locally to prevent wear on the wiring harness acquisition component 21 by the top cover, the limited location and quantity of foam cannot cover all points, thus providing limited protection for the wiring harness acquisition component 21. However, the battery pack provided in this embodiment, by setting a reinforcing plate 30, can provide forced support, thus avoiding the problem of inadequate protection using foam in related technologies.

[0023] like Figure 2 and Figure 3 As shown, in this embodiment, the reinforcing plate 30 includes a connecting section 32 and a protective section 33. One end of the connecting section 32 is connected to one end of the protective section 33, and the connecting section 32 is connected to the housing 10. A clearance groove 31 is provided on the lower surface of the protective section 33. With the above structure, using the segmented connecting section 32 and protective section 33, the connecting section 32 can achieve a firm connection between the reinforcing plate 30 and the housing 10, and the protective section 33 can provide effective protection for the wire harness acquisition component 21.

[0024] like Figure 3As shown, in this embodiment, the connecting segment 32 has a first opening 321 extending through its upper and lower surfaces, and a potting layer 34 is disposed within the first opening 321. By providing the first opening 321, the filling of the potting layer 34 is facilitated, enhancing the connection strength between the connecting segment 32 and the housing 10. Simultaneously, the insulating properties of the potting layer 34 protect electrical components from short circuits. This structure makes the battery pack structure more robust, further improves electrical safety, and helps extend the battery pack's service life.

[0025] Specifically, the first opening 321 has multiple intersecting first ribs 322 and multiple second ribs 323, which divide the first opening 321 into multiple sub-openings 3211, forming a hollow structure. Each sub-opening 3211 contains a potting layer 34. The arrangement of the multiple first ribs 322 and multiple second ribs 323 increases the contact area between the potting layer 34 and the connecting section 32, improving the connection strength and facilitating the potting operation, ensuring uniform distribution of the adhesive. This structure further enhances the stability of the internal structure of the battery pack, provides more comprehensive protection for electrical components, and helps improve the overall performance and reliability of the battery pack.

[0026] like Figure 3 and Figure 5 As shown, in this embodiment, buffer pads 35 are provided on both the upper and lower surfaces of the reinforcing plate 30. Each buffer pad 35 has a second opening 351 corresponding to the first opening 321. The buffer pad 35 surrounds the outside of the first opening 321. The upper surface of the buffer pad 35 is connected to or abuts against the top cover, and the lower surface of the buffer pad 35 is connected to or abuts against the housing 10. Utilizing the elastic properties of the buffer pad 35, the Z-axis tolerance inside the battery pack is absorbed, while preventing glue overflow during reinforcing plate potting. Simultaneously, the buffer pad 35 also helps to disperse the force of being stepped on, further protecting the safety of the wiring harness acquisition component 21 and extending the service life of the battery pack.

[0027] In this embodiment, the sum of the thickness of the reinforcing plate 30 and the thickness of the two buffer pads 35 is A, and the thickness of the potting layer 34 is B, where A > B. By ensuring that A > B, it is possible to prevent glue overflow during the potting process of the reinforcing plate 30.

[0028] The thickness of the reinforcing plate 30 and the thickness of the two buffer pads 35 refer to the thickness of the reinforcing plate 30 and the buffer pads 35 in terms of... Figure 6 The dimensions in the vertical direction. The thickness of the potting layer 34 also refers to its dimensions in the vertical direction. Figure 6 The dimensions in the vertical direction. Furthermore, the thickness of the cushioning pad 35 is the thickness of the cushioning pad 35 in its natural state (uncompressed).

[0029] In this embodiment, the upper surface of the buffer pad 35 is bonded to the upper cover, and the lower surface of the buffer pad 35 is bonded to the housing 10, which can improve the assembly firmness of the reinforcing plate 30 and ensure high reliability.

[0030] Specifically, compared to using bolts to connect the top cover to the box 10, the connection between the top cover and the box 10 is achieved by bonding with a buffer pad 35, which improves the overall package mode and eliminates the problem of bolt torque attenuation, thereby improving assembly firmness and reliability.

[0031] In this embodiment, the battery cell assembly 20 includes multiple wire harness collection components 21, all extending along a first direction. These components are spaced apart in a second direction at an angle to the first direction. The reinforcing plate 30 includes multiple connecting segments 32 and multiple protective segments 33, which are staggered in the second direction, with each protective segment corresponding to one of the wire harness collection components 21. The arrangement of the multiple wire harness collection components 21 achieves internal electrical connections within the battery cell assembly 20. The multiple connecting segments 32 further enhance the connection strength between the reinforcing plate 30 and the housing 10. The multiple protective segments 33 provide independent protection and support for each wire harness collection component 21, preventing concentrated trampling forces and protecting the safety of the wire harness collection component 21.

[0032] In this embodiment, the first direction and the second direction are perpendicular.

[0033] Specifically, the battery pack includes multiple reinforcing plates 30, which are spaced apart in a first direction. Each wiring harness acquisition component 21 has multiple reinforcing plates 30 above it. A clearance groove 31 extends through both sides of the reinforcing plates 30 in the first direction, and the wiring harness acquisition component 21 protrudes from both sides of the clearance groove 31 in the first direction. The arrangement of multiple reinforcing plates 30 provides all-around protection for the battery cell assembly 20, while the structural design of the clearance groove 31 also provides the necessary space for the extension of the wiring harness acquisition component 21.

[0034] In this embodiment, the height of the clearance groove 31 is C, the width of the clearance groove 31 is D, and 0.05≤D / C≤0.15. By setting D / C within the above range, both the structural strength of the reinforcing plate 30 at the clearance groove 31 and the protective effect of the clearance groove 31 on the wire harness acquisition component 21 can be ensured.

[0035] The height of the clearance groove 31 refers to Figure 6 The vertical dimension of the clearance groove 31. The width of the clearance groove 31 refers to... Figure 6 The dimensions of the central clearance groove 31 in the left-right direction.

[0036] Specifically, D / C can be 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, and other values ​​between 0.05 and 0.15.

[0037] In this embodiment, the width of the clearance groove 31 is D, the width of the wire harness acquisition component 21 is E, and 2mm ≤ DE ≤ 6mm; and / or, the height of the clearance groove 31 is C, and the thickness of the wire harness acquisition component 21 is F, and 0.2mm ≤ CF ≤ 1mm. By controlling DE and CF within the above ranges, the clearance groove 31 has sufficient space to avoid the wire harness acquisition component 21, and the size of the reinforcing plate 30 will not be too large, affecting the space utilization rate inside the battery pack.

[0038] The width of the wire harness acquisition component 21 refers to the portion of it located in the clearance groove 31. Figure 6 The dimension in the left-right direction. The thickness of the wire harness acquisition component 21 refers to the portion of it located in the clearance groove 31. Figure 6 The dimensions in the top and bottom directions.

[0039] Specifically, DE can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, and other values ​​between 2mm and 6mm. CF can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, and other values ​​between 0.2mm and 1mm.

[0040] In this embodiment, the width of the clearance groove 31 is D, 20mm≤D≤60mm; and / or, the width of the wire harness collecting component 21 is E, 16mm≤E≤56mm. By setting the width D of the clearance groove 31 and the width E of the wire harness collecting component 21 within the above ranges, both the structural strength of the reinforcing plate 30 at the clearance groove 31 and the protective effect of the clearance groove 31 on the wire harness collecting component 21 can be ensured.

[0041] Specifically, D can be 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm, 34mm, 36mm, 38mm, 40mm, 42mm, 44mm, 46mm, 48mm, 50mm, 52mm, 54mm, 56mm, 58mm, 60mm, or any other value between 20mm and 60mm. In this embodiment, D is preferably 28mm or 54mm.

[0042] Specifically, E can be 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm, 34mm, 36mm, 38mm, 40mm, 42mm, 44mm, 46mm, 48mm, 50mm, 52mm, 54mm, 56mm, or any other value between 16mm and 56mm. In this embodiment, E is preferably 24mm or 50mm.

[0043] The height of the clearance groove 31 is C, where 0.5mm ≤ C ≤ 1mm; or, the height of the clearance groove 31 is C, where 2.3mm ≤ C ≤ 3mm. By setting the height C of the clearance groove 31 within the above range, both the structural strength of the reinforcing plate 30 at the clearance groove 31 and the protective effect of the clearance groove 31 on the wire harness acquisition component 21 can be ensured.

[0044] In this embodiment, the thickness of the wire harness acquisition component 21 is 0.3 mm or 2 mm. Specifically, the wire harness acquisition component 21 includes an FPC (Flexible Printed Circuit) 211, which utilizes the flexibility and thinness of the FPC 211 to realize the internal electrical connection of the battery cell assembly 20. When the FPC 211 is a single layer, the thickness of the wire harness acquisition component 21 is 0.3 mm. When the FPC 211 is a double layer, the thickness of the wire harness acquisition component 21 is 2 mm.

[0045] When the thickness of the wire harness acquisition component 21 is 0.3mm, 0.5mm≤C≤1mm. Specifically, C can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, or any other value between 0.5mm and 1mm.

[0046] When the thickness of the wire harness acquisition component 21 is 2mm, 2.3mm≤C≤3mm. Specifically, C can be 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, or any other value between 2.3mm and 3mm.

[0047] In this embodiment, the housing 10 includes a housing body 11 and a cold plate 12. A top cover is disposed on the housing body 11, and the battery cell assembly 20 is disposed within the housing body 11, providing space for the battery cell assembly 20. The cold plate 12 is disposed within and connected to the housing body 11, and is located above the battery cell. The lower surface of the reinforcing plate 30 is connected to the upper surface of the cold plate 12. The cold plate 12 can cool the battery cell, improving the thermal management capability and electrical safety of the battery pack.

[0048] In this embodiment, the upper surface of the reinforcing plate 30 is higher than the upper surface of the battery cell assembly 20, that is, the upper surface of the reinforcing plate 30 is the highest point inside the housing 10. With the above structure, the reinforcing plate 30 can contact the top cover, which can prevent the battery cell assembly 20 from directly contacting the top cover, forming an effective physical isolation, thereby protecting the battery cell assembly 20.

[0049] The reinforcing plate 30 includes a plastic plate, which ensures its insulation and lightweight properties.

[0050] Another embodiment of this utility model provides an electrical device, which includes a battery pack, the battery pack being the one provided above. Therefore, this electrical device can also achieve the following: when a passenger steps on the top cover, the reinforcing plate 30 can protect the wiring harness collection component 21, preventing wear between the top cover and the wiring harness collection component 21, thereby preventing damage to the wiring harness collection component 21 due to wear, and thus preventing electrical connection failures.

[0051] Electrical devices include, but are not limited to, vehicles.

[0052] The apparatus provided by the embodiments has the following beneficial effects:

[0053] (1) The reinforcing plate 30 can protect the wire harness acquisition component 21 and prevent wear between the top cover and the wire harness acquisition component 21, thereby preventing the wire harness acquisition component 21 from being damaged due to wear and thus preventing electrical connection failure.

[0054] (2) The combination of the reinforcing plate 30 and the potting layer 34 can form a strong support to prevent the FPC from being damaged by being stepped on. At the same time, the reinforcing plate 30 and the potting layer 34 are insulated themselves to protect the FPC from wear and short circuits.

[0055] (3) Compared to using bolts to connect the top cover to the housing 10, the connection between the top cover and the housing 10 is achieved by bonding with the buffer pad 35, which eliminates the problem of bolt torque attenuation, thereby improving assembly firmness and reliability. In addition, the buffer pad 35 can absorb the Z-axis tolerance inside the battery pack and prevent glue from overflowing during the filling of the reinforcing plate.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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).

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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).

[0068] This application does not specifically limit 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.

[0069] 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.

[0070] 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.

[0071] 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).

[0072] 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).

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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 battery pack, characterized in that, The battery pack includes a housing (10), a top cover, and a battery cell assembly (20). The top cover covers the housing (10), and the battery cell assembly (20) is disposed inside the housing (10). The battery cell assembly (20) includes a battery cell and a wiring harness collection device (21). The wiring harness collection device (21) is electrically connected to the battery cell and is located above the battery cell. The battery pack further includes a reinforcing plate (30), which is connected to the housing (10) and located above the wire harness acquisition component (21). The lower surface of the reinforcing plate (30) has a clearance groove (31), at least part of the wire harness acquisition component (21) is located in the clearance groove (31), and there is a gap between the top wall of the clearance groove (31) and the upper surface of the wire harness acquisition component (21).

2. The battery pack according to claim 1, characterized in that, The reinforcing plate (30) includes a connecting section (32) and a protective section (33). One end of the connecting section (32) is connected to one end of the protective section (33). The connecting section (32) is connected to the housing (10). The clearance groove (31) is provided on the lower surface of the protective section (33).

3. The battery pack according to claim 2, characterized in that, The connecting segment (32) has a first opening (321) extending through its upper and lower surfaces, and an adhesive layer (34) is provided inside the first opening (321).

4. The battery pack according to claim 3, characterized in that, The first opening (321) has a plurality of first ribs (322) and a plurality of second ribs (323) arranged in an intersecting manner. The plurality of first ribs (322) and the plurality of second ribs (323) divide the first opening (321) into a plurality of sub-openings (3211). Each sub-opening (3211) is provided with the potting layer (34).

5. The battery pack according to claim 3, characterized in that, The upper and lower surfaces of the reinforcing plate (30) are provided with buffer pads (35). The buffer pads (35) have a second opening (351) corresponding to the first opening (321). The buffer pads (35) surround the outside of the first opening (321). The upper surface of the buffer pads (35) is connected to the upper cover, and the lower surface of the buffer pads (35) is connected to the box body (10).

6. The battery pack according to claim 5, characterized in that, The sum of the thickness of the reinforcing plate (30) and the thickness of the two buffer pads (35) is A, and the thickness of the potting layer (34) is B, where A > B; and / or, The upper surface of the buffer pad (35) is bonded to the upper cover, and the lower surface of the buffer pad (35) is bonded to the box body (10).

7. The battery pack according to claim 2, characterized in that, The battery cell assembly (20) includes a plurality of wire harness collection components (21), all of which extend along a first direction. The plurality of wire harness collection components (21) are arranged at intervals in a second direction that is at an angle to the first direction. The reinforcing plate (30) includes a plurality of connecting segments (32) and a plurality of protective segments (33), which are arranged alternately in the second direction. The plurality of protective segments (33) are arranged in a one-to-one correspondence with the plurality of wire harness collection components (21).

8. The battery pack according to claim 7, characterized in that, The battery pack includes a plurality of reinforcing plates (30), which are spaced apart in the first direction. Each of the wire harness collection components (21) is provided with a plurality of reinforcing plates (30) above it. The clearance groove (31) passes through both sides of the reinforcing plate (30) in the first direction, and the wire harness collection component (21) extends out from both sides of the clearance groove (31) in the first direction.

9. The battery pack according to any one of claims 1 to 8, characterized in that, The height of the clearance groove (31) is C, and the width of the clearance groove (31) is D, where 0.05≤D / C≤0.

15.

10. The battery pack according to any one of claims 1 to 8, characterized in that, The width of the clearance groove (31) is D, and the width of the wire harness acquisition component (21) is E, 2mm ≤ DE ≤ 6mm; and / or, The height of the clearance groove (31) is C, and the thickness of the wire harness acquisition component (21) is F, 0.2mm≤CF≤1mm.

11. The battery pack according to any one of claims 1 to 8, characterized in that, The width of the clearance groove (31) is D, 20mm≤D≤60mm; and / or, The width of the wire harness acquisition component (21) is E, 16mm≤E≤56mm.

12. The battery pack according to any one of claims 1 to 8, characterized in that, The height of the clearance groove (31) is C, where 0.5mm ≤ C ≤ 1mm; or, The height of the clearance groove (31) is C, where 2.3mm ≤ C ≤ 3mm.

13. The battery pack according to any one of claims 1 to 8, characterized in that, The housing (10) includes a housing body (11) and a cold plate (12). The top cover is disposed on the housing body (11). The battery cell assembly (20) is disposed inside the housing body (11). The cold plate (12) is disposed inside the housing body (11) and connected to the housing body (11). The cold plate (12) is located above the battery cell. The lower surface of the reinforcing plate (30) is connected to the upper surface of the cold plate (12); and / or, The upper surface of the reinforcing plate (30) is higher than the upper surface of the battery cell assembly (20).

14. The battery pack according to any one of claims 1 to 8, characterized in that, The wire harness acquisition component (21) includes an FPC (211); and / or, The reinforcing plate (30) includes a plastic plate.

15. An electrical appliance, characterized in that, The electrical device includes a battery pack, which is the battery pack according to any one of claims 1 to 14.

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