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 battery box, multiple upper battery groups and multiple lower battery groups, battery box includes upper battery compartment and lower battery compartment;Wherein, the bottom of upper battery compartment is provided with first cold plate, the bottom of lower battery compartment is provided with second cold plate, battery box has total water inlet and total water outlet, the water inlet of first cold plate is connected with total water inlet by first water inlet pipe, the water inlet of second cold plate is connected with total water inlet by second water inlet pipe, the water outlet of first cold plate is connected with total water outlet by first water outlet pipe, the water outlet of second cold plate is connected with total water outlet by second water outlet pipe, the total flow passage cross-sectional area of first cold plate is greater than the total flow passage cross-sectional area of second cold plate. Through the technical scheme provided in the present application, the problem of poor heat dissipation effect of the upper battery compartment in the related art can be solved.

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] A battery pack is used to store and supply electrical energy. It typically consists of several battery cells, connectors, a battery management system (BMS), a cooling system, electrical interfaces, and a casing. The main function of a battery pack is to integrate multiple battery cells into a single unit. Battery cells are connected in parallel or series to increase the voltage, capacity, or power of the battery system.

[0003] In related technologies, battery packs include an upper battery compartment and a lower battery compartment. This layout allows both the upper and lower battery compartments to accommodate battery packs, enabling flexible arrangement of the battery packs according to actual needs to expand capacity or optimize functionality. For example, in scenarios with high capacity requirements, the upper and lower battery compartments can simultaneously accommodate multiple battery packs to power the device; and this compartmentalized structure also provides convenience when different battery packs need to be classified, managed, or controlled independently.

[0004] However, in related technologies, the upper battery compartment needs to dissipate heat for itself and is also affected by the heat from the lower battery compartment, resulting in poor heat dissipation performance of the upper battery compartment. Utility Model Content

[0005] This utility model provides a battery pack and an electrical device having the same, to solve the problem of poor heat dissipation in the upper battery compartment in related technologies.

[0006] According to one aspect of the present invention, a battery pack is provided, comprising a battery housing, multiple upper battery packs, and multiple lower battery packs. The battery housing includes an upper battery compartment and a lower battery compartment, with the multiple upper battery packs disposed in the upper battery compartment and the multiple lower battery packs disposed in the lower battery compartment. A first cold plate is disposed at the bottom of the upper battery compartment, and a second cold plate is disposed at the bottom of the lower battery compartment. The battery housing has a main water inlet and a main water outlet. The water inlet of the first cold plate is connected to the main water inlet via a first water inlet pipe, and the water inlet of the second cold plate is connected to the main water inlet via a second water inlet pipe. The water outlet of the first cold plate is connected to the main water outlet via a first water outlet pipe, and the water outlet of the second cold plate is connected to the main water outlet via a second water outlet pipe. The total flow channel cross-sectional area of ​​the first cold plate is larger than that of the second cold plate.

[0007] According to another aspect of the present invention, an electrical device is provided, the electrical device including a battery pack, the battery pack being the battery pack provided above.

[0008] By applying the technical solution of this utility model, the first cold plate of the upper battery compartment can cool the upper battery compartment, and the second cold plate of the lower battery compartment can cool the lower battery compartment. The first and second cold plates share the same total water inlet and outlet of the battery box, resulting in a simple water channel structure. Furthermore, since the total cross-sectional area of ​​the flow channel of the first cold plate is larger than that of the second cold plate, the cooling capacity of the first cold plate can be increased while maintaining the same cooling capacity of the second cold plate. This allows the first cold plate to not only cool the upper battery compartment but also reduce or eliminate the heat impact of the lower battery compartment on the upper battery compartment, thereby improving the heat dissipation effect of the upper battery compartment. Attached Figure Description

[0009] 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:

[0010] Figure 1 A schematic diagram of the battery pack provided in an embodiment of the present invention is shown;

[0011] Figure 2 This shows a partial enlarged view of the battery pack provided in an embodiment of the present invention at the first water inlet pipe and the second water inlet pipe;

[0012] Figure 3 A cross-sectional view of the first cold plate of the battery pack provided in an embodiment of the present invention is shown;

[0013] Figure 4 A cross-sectional view of the second cold plate of the battery pack provided in an embodiment of the present invention is shown;

[0014] Figure 5 A partially enlarged view of the battery pack provided in an embodiment of the present invention is shown;

[0015] Figure 6 This shows another partially enlarged view of the battery pack provided in an embodiment of the present invention.

[0016] The above figures include the following reference numerals:

[0017] 10. Upper battery compartment; 11. First cold plate; 111. First flow channel; 12. First water inlet pipe;

[0018] 20. Lower battery compartment; 21. Second cold plate; 211. Second flow channel; 22. Second water inlet pipe;

[0019] 30. Install the battery pack;

[0020] 40. Remove the battery pack;

[0021] H, the height of the lower battery pack;

[0022] D1, the distance between the first cold plate and the second cold plate;

[0023] D2, the distance between the first cold plate and the lower battery pack. Detailed Implementation

[0024] 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.

[0025] like Figures 1 to 6 As shown, this embodiment of the present invention provides a battery pack, which includes a battery housing, multiple upper battery packs 30, and multiple lower battery packs 40. The battery housing includes an upper battery compartment 10 and a lower battery compartment 20. The multiple upper battery packs 30 are disposed in the upper battery compartment 10, and the multiple lower battery packs 40 are disposed in the lower battery compartment 20. A first cold plate 11 is disposed at the bottom of the upper battery compartment 10, and a second cold plate 21 is disposed at the bottom of the lower battery compartment 20. The battery housing has a main water inlet and a main water outlet. The water inlet of the first cold plate 11 is connected to the main water inlet via a first water inlet pipe 12, and the water inlet of the second cold plate 21 is connected to the main water inlet via a second water inlet pipe 22. The water outlet of the first cold plate 11 is connected to the main water outlet via a first water outlet pipe, and the water outlet of the second cold plate 21 is connected to the main water outlet via a second water outlet pipe. The total flow channel cross-sectional area of ​​the first cold plate 11 is larger than that of the second cold plate 21.

[0026] Using the battery pack provided in this embodiment, the first cold plate 11 of the upper battery compartment 10 can cool the upper battery compartment 10, and the second cold plate 21 of the lower battery compartment 20 can cool the lower battery compartment 20. The first cold plate 11 and the second cold plate 21 share the same total water inlet and outlet of the battery box, resulting in a simple water channel structure. Furthermore, since the total flow channel cross-sectional area of ​​the first cold plate 11 is larger than that of the second cold plate 21, the cooling capacity of the first cold plate 11 can be increased while maintaining the same cooling capacity of the second cold plate 21. This allows the first cold plate 11 to not only cool the upper battery compartment 10 but also reduce or eliminate the heat impact of the lower battery compartment 20 on the upper battery compartment 10, thereby improving the heat dissipation effect of the upper battery compartment 10, preventing localized overheating, and improving service life and operational safety.

[0027] It should be noted that the cross-sectional area of ​​the flow channel in the first cold plate 11 refers to the area of ​​the cross-section of the flow channel in the first cold plate 11 perpendicular to its flow direction; the cross-sectional area of ​​the flow channel in the second cold plate 21 refers to the area of ​​the cross-section of the flow channel in the second cold plate 21 perpendicular to its flow direction. Therefore, the total cross-sectional area of ​​the flow channel in the first cold plate 11 refers to the sum of the cross-sectional areas of all the flow channels in the first cold plate 11; the total cross-sectional area of ​​the flow channel in the second cold plate 21 refers to the sum of the cross-sectional areas of all the flow channels in the second cold plate 21.

[0028] Specifically, a battery pack is composed of multiple individual battery cells. The battery cell is the core component of the battery pack and the basic unit for storing and releasing electrical energy. By combining multiple battery cells into a battery pack, the battery capacity requirements of different devices can be met, achieving a large-capacity battery pack.

[0029] In this embodiment, the first cold plate 11 and the second cold plate 21 are both water-cooled plates. A water-cooled plate is a device that achieves battery thermal management through water circulation. Its basic working principle is to use the high specific heat capacity and excellent thermal conductivity of water to remove the heat generated by the battery pack during operation, so as to keep the battery pack working within a suitable temperature range.

[0030] In this embodiment, the diameter of the first inlet pipe 12 is larger than that of the second inlet pipe 22, and the diameter of the first outlet pipe is larger than that of the second outlet pipe. The coolant flow distribution is controlled by adjusting the pipe diameters; a larger diameter means a larger flow rate, thereby further enhancing the cooling effect of the first cold plate 11 and improving the heat dissipation of the upper battery compartment 10. This structure achieves a reasonable distribution of coolant between the first cold plate 11 and the second cold plate 21. Even with a large difference in the number of batteries, the coolant flow rate can be matched to the battery's heat generation, improving the overall efficiency of the cooling system, ensuring the battery operates within its optimal operating temperature range, and extending battery life.

[0031] In this embodiment, the length of the first water inlet pipe 12 is shorter than the length of the second water inlet pipe 22, and the length of the first water outlet pipe is shorter than the length of the second water outlet pipe. The shorter first water inlet pipe 12 and the first water outlet pipe allow the coolant to flow into or out of the first cold plate 11 more quickly, thereby further improving the cooling effect of the first cold plate 11 and further improving the heat dissipation effect of the upper battery compartment 10.

[0032] By utilizing fluid dynamics theory, shorter pipes can reduce energy loss during coolant flow, lower system pressure drop, and thus improve cooling efficiency. Reduced energy consumption and smoother coolant flow contribute to increased overall energy density of the battery pack.

[0033] like Figure 5 and Figure 6As shown, in this embodiment, the height of the lower battery pack 40 is H, and the distance between the first cold plate 11 and the second cold plate 21 is D1, where 0.8 ≤ H / D1 ≤ 0.95. Setting H / D1 within this range avoids both excessively close proximity of the first cold plate 11 and the second cold plate 21, which would lead to overly concentrated heat sources and affect cooling efficiency, and excessively large distances between them, which would increase the volume of the battery pack, thus facilitating space optimization. Therefore, setting H / D1 within this range achieves a more uniform heat distribution between the upper and lower battery compartments within a limited space, improving the thermal management capability of the battery pack.

[0034] H / D1 can be 0.8, 0.85, 0.9, 0.95, or any other value between 0.8 and 0.9.

[0035] In this embodiment, the height H of the lower battery pack 40 is in cm, and the distance D1 between the first cold plate 11 and the second cold plate 21 is also in cm.

[0036] It should be noted that the distance D1 between the first cold plate 11 and the second cold plate 21 refers to the distance between the lower surface of the first cold plate 11 and the upper surface of the second cold plate 21.

[0037] In this embodiment, the distance between the first cold plate 11 and the lower battery pack 40 is D2, where 1cm≤D2≤5cm. By adjusting the distance between the first cold plate 11 and the lower battery pack 40, the heat exchange between them is not too large due to the distance being too small, nor is the space occupied by the distance being too large.

[0038] The distance D2 between the first cold plate 11 and the lower battery pack 40 can be 1cm, 2cm, 3cm, 4cm, 5cm, or any other value between 1cm and 5cm. In this embodiment, D2 is preferably 2cm to 3.5cm.

[0039] It should be noted that the distance D2 between the first cold plate 11 and the lower battery pack 40 refers to the distance between the lower surface of the first cold plate 11 and the upper surface of the lower battery pack 40.

[0040] like Figure 3 and Figure 4 As shown, in this embodiment, the first cold plate 11 has multiple first flow channels 111, and the second cold plate 21 has multiple second flow channels 211. The cross-sectional area of ​​the first flow channels 111 is larger than that of the second flow channels 211. Based on fluid flow characteristics, increasing the cross-sectional area of ​​the first flow channels 111 increases the coverage of the coolant, thereby enhancing the cooling effect on the upper battery compartment 10. Even with different numbers of batteries, the heat dissipation efficiency of the upper and lower battery layers can remain balanced, ensuring stable operation of the battery system.

[0041] In some embodiments, the first cold plate 11 is provided with a plurality of first flow channels 111, and the second cold plate 21 is provided with a plurality of second flow channels 211, wherein the number of first flow channels 111 is greater than the number of second flow channels 211. By increasing the number of flow channels in the first cold plate 11, the surface area in contact between the coolant and the battery can be increased, thereby enhancing the cooling effect. The above structure significantly improves the heat dissipation capacity of the upper battery compartment 10, effectively controlling the temperature and preventing overheating even with a large number of batteries.

[0042] In some embodiments, the first cold plate 11 is provided with a multi-layer flow channel structure, which is arranged at intervals along the thickness direction of the first cold plate 11. By constructing a multi-layer flow channel structure within the first cold plate 11, the contact time between the coolant and the cold plate is increased, thereby improving heat exchange efficiency. Even under extreme conditions, the battery temperature can be kept within a safe range, extending battery life.

[0043] In some embodiments, the flow channels in the first cold plate 11 and the second cold plate 21 are staggered, so that the cooling energy generated by the first cold plate 11 and the second cold plate 21 can be evenly distributed to the battery pack, thereby improving the heat dissipation effect of the battery pack.

[0044] It should be noted that the flow channels in the first cold plate 11 and the flow channels in the second cold plate 21 are misaligned. The “misalignment” means that the projection of the flow channel in the first cold plate 11 on the horizontal plane is misaligned with the projection of the flow channel in the second cold plate 21 on the horizontal plane.

[0045] Another embodiment of this utility model provides an electrical device, which includes a battery pack, specifically the battery pack described above. Therefore, this electrical device can also increase the cooling capacity of the first cold plate 11 while maintaining the same cooling capacity of the second cold plate 21. This allows the first cold plate 11 to both cool the upper battery compartment 10 and reduce or eliminate the heat impact of the lower battery compartment 20 on the upper battery compartment 10, thereby improving the heat dissipation effect of the upper battery compartment 10, preventing localized overheating, and improving service life and safety.

[0046] Integrating the aforementioned battery pack into electrical devices as a core component of their energy supply, and employing optimized thermal management design, ensures the stability and safety of the devices under various operating conditions. The operating efficiency and reliability of the electrical devices are significantly enhanced, particularly under high power output and long-term operation, where the advantages of the battery pack's thermal management are especially evident.

[0047] Electrical devices include, but are not limited to, vehicles.

[0048] The apparatus provided by the embodiments has the following beneficial effects:

[0049] (1) Ensure that the heat dissipation effect of the upper and lower battery packs is basically the same. By designing the total flow channel cross-sectional area of ​​the first cold plate 11 to be larger than that of the second cold plate 21, and considering that the upper battery pack 30 is more affected by heat, this design can effectively balance the heat dissipation requirements of the two battery packs and avoid battery performance degradation or safety hazards caused by uneven heat dissipation;

[0050] (2) By reasonably arranging the distance between the cold plates and the distance between the first cold plate 11 and the lower battery pack 40, good heat exchange efficiency can be achieved in a limited space. The distance setting must ensure sufficient heat dissipation while avoiding unnecessary space waste. This is especially important for fields such as electric vehicles, because the interior space of the vehicle is limited, and efficient heat dissipation of the battery is a key factor in ensuring battery safety and extending its service life.

[0051] (3) The inlet and outlet pipes connecting the two cold plates are designed with different aperture sizes and lengths. The first inlet pipe 12 and the first outlet pipe connecting the first cold plate 11 are both shorter and have larger apertures, which helps to guide more coolant to flow to the first cold plate 11, which is more heavily heated, and vice versa. This flexibility improves the response speed and efficiency of the cooling system and further optimizes the overall heat dissipation performance of the battery pack.

[0052] Overall, the combination of these designs enhances the battery pack's thermal management capabilities, not only more effectively controlling battery temperature and preventing overheating, but also extending battery life and reducing maintenance costs. Furthermore, good thermal management also helps improve battery energy density, as a more stable temperature environment facilitates the optimization of internal chemical reactions within the battery.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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).

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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).

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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).

[0069] 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).

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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 by, The battery pack includes a battery housing, multiple upper battery packs (30) and multiple lower battery packs (40). The battery housing includes an upper battery compartment (10) and a lower battery compartment (20). The multiple upper battery packs (30) are disposed in the upper battery compartment (10) and the multiple lower battery packs (40) are disposed in the lower battery compartment (20). The upper battery compartment (10) is provided with a first cold plate (11) at its bottom, and the lower battery compartment (20) is provided with a second cold plate (21) at its bottom. The battery box has a total water inlet and a total water outlet. The water inlet of the first cold plate (11) is connected to the total water inlet through a first water inlet pipe (12). The water inlet of the second cold plate (21) is connected to the total water inlet through a second water inlet pipe (22). The water outlet of the first cold plate (11) is connected to the total water outlet through a first water outlet pipe. The water outlet of the second cold plate (21) is connected to the total water outlet through a second water outlet pipe. The total flow channel cross-sectional area of ​​the first cold plate (11) is larger than that of the second cold plate (21).

2. The battery pack according to claim 1, characterized in that, The diameter of the first inlet pipe (12) is larger than the diameter of the second inlet pipe (22); and / or, The diameter of the first water outlet pipe is larger than the diameter of the second water outlet pipe.

3. The battery pack according to claim 1, characterized in that, The length of the first inlet pipe (12) is less than the length of the second inlet pipe (22); and / or, The length of the first water outlet pipe is less than the length of the second water outlet pipe.

4. The battery pack of claim 1, wherein, The height of the lower battery pack (40) is H, and the distance between the first cold plate (11) and the second cold plate (21) is D1, where 0.8 ≤ H / D1 ≤ 0.

95.

5. The battery pack of claim 1, wherein, The distance between the first cold plate (11) and the lower battery pack (40) is D2, where 1cm≤D2≤5cm.

6. The battery pack of any one of claims 1-5, wherein, The first cold plate (11) is provided with a plurality of first flow channels (111), and the second cold plate (21) is provided with a plurality of second flow channels (211). The cross-sectional area of ​​the first flow channel (111) is larger than the cross-sectional area of ​​the second flow channel (211).

7. The battery pack according to any one of claims 1 to 5, characterized in that, The first cold plate (11) is provided with a plurality of first flow channels (111), and the second cold plate (21) is provided with a plurality of second flow channels (211). The number of first flow channels (111) is greater than the number of second flow channels (211).

8. The battery pack according to any one of claims 1 to 5, characterized in that, The first cold plate (11) is provided with a multi-layer flow channel structure, and the multi-layer flow channel structure is arranged at intervals in the thickness direction of the first cold plate (11).

9. The battery pack according to any one of claims 1 to 5, characterized in that, The flow channels in the first cold plate (11) and the flow channels in the second cold plate (21) are staggered.

10. An electrical device, characterized in that, The electrical device includes a battery pack, which is the battery pack according to any one of claims 1 to 9.

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