Battery pack and electric device with same

Abstract

This utility model provides a battery pack and an electrical device having the same. The battery pack includes: a heat exchange shell, comprising a main body, a top plate, a bottom plate, and multiple separators, wherein the main body and each separator are located between the top plate and the bottom plate, and the multiple separators are spaced apart, each separator being connected to the main body; and a battery disposed within the heat exchange shell, the battery having a top surface, a bottom surface, and multiple side surfaces located between the top and bottom surfaces, including a first side surface and a second side surface facing away from each other, and a third side surface located between the first and second side surfaces; wherein the main body is fitted with the third side surface, the top plate is fitted with the top surface of the battery, the bottom plate is fitted with the bottom surface of the battery, and the first and second side surfaces are each fitted with a separator. The technical solution of this application effectively solves the problem of poor battery heat dissipation in related technologies.

Description

Technical Field

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

[0002] In the current field of battery technology, especially in electric vehicles and energy storage systems, battery design and manufacturing processes are constantly being optimized to meet the demands of fast charging, resulting in significant improvements in battery capacity and charging efficiency. However, with the increase in battery capacity and the acceleration of charging speed, the heat generated by the battery during fast charging also increases dramatically.

[0003] In related technologies, in order to dissipate heat from the battery, a heat dissipation structure is generally set in the battery pack. However, due to design and structural limitations, the existing heat dissipation structure cannot meet the heat dissipation requirements of the battery. Utility Model Content

[0004] The main objective of this invention is to provide a battery pack and an electrical device having the same, in order to solve the problem of poor heat dissipation of batteries in related technologies.

[0005] To achieve the above objectives, according to one aspect of the present invention, a battery pack is provided, comprising: a heat exchange shell, including a main body, a top plate, a bottom plate, and multiple separators, wherein the main body and each separator are located between the top plate and the bottom plate, the multiple separators are spaced apart, and each separator is connected to the main body; and a battery, wherein the battery is disposed within the heat exchange shell, the battery having a top surface, a bottom surface, and multiple side surfaces located between the top surface and the bottom surface, the multiple side surfaces including a first side surface and a second side surface facing away from each other, and a third side surface located between the first side surface and the second side surface; wherein the main body is fitted with the third side surface, the top plate is fitted with the top surface of the battery, the bottom plate is fitted with the bottom surface of the battery, and the first side surface and the second side surface are respectively fitted with a separator.

[0006] 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.

[0007] By applying the technical solution of this utility model, the top surface of the battery is attached to the top plate, the bottom surface of the battery is attached to the bottom plate, the first side of the battery is attached to a separator, the second side of the battery is attached to another separator, and the third side of the battery is attached to the main plate. That is, the first, second, and third sides, the top surface, and the bottom surface of the battery can all be attached to the heat exchange shell. This allows the heat generated by the battery to be conducted through the first side to one separator, through the second side to another separator, through the third side to the main plate, through the top surface to the top plate, and through the bottom surface to the bottom plate. This increases the contact area between the battery and the heat exchange shell, resulting in better heat dissipation. Therefore, the technical solution of this application effectively solves the problem of poor battery heat dissipation in related technologies. 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 perspective structural schematic diagram of an embodiment of the battery pack according to the present invention is shown;

[0010] Figure 2 It shows Figure 1 A three-dimensional structural diagram of multiple battery rows in a battery pack;

[0011] Figure 3 It shows Figure 2 A three-dimensional structural diagram of multiple battery rows in a battery pack from another perspective;

[0012] Figure 4 It shows Figure 3 A magnified view of part A of the battery pack;

[0013] Figure 5 It shows Figure 1 A three-dimensional structural diagram of the heat exchange shell of the battery pack;

[0014] Figure 6 It shows Figure 5 A cross-sectional schematic diagram of the heat exchange shell;

[0015] Figure 7 It shows Figure 6 A magnified view of part B of the heat exchange shell;

[0016] Figure 8 It shows Figure 6 A magnified view of part C of the heat exchange shell;

[0017] Figure 9 It shows Figure 5A three-dimensional structural diagram showing the connection between the main body, top plate, and bottom plate of the heat exchange shell.

[0018] Figure 10 It shows Figure 9 A magnified schematic diagram of part D of the heat exchange shell;

[0019] Figure 11 It shows Figure 5 A three-dimensional structural diagram of the partition plate of the heat exchange shell;

[0020] Figure 12 It shows Figure 11 A magnified schematic diagram of part E of the heat exchange shell;

[0021] Figure 13 It shows Figure 1 A three-dimensional structural diagram of the first heat insulation pad of the battery pack;

[0022] Figure 14 It shows Figure 13 A magnified view of part F of the first heat insulation pad;

[0023] Figure 15 It shows Figure 2 A three-dimensional structural diagram of a battery column in a battery pack;

[0024] Figure 16 It shows Figure 8 A magnified view of part G of the battery pack;

[0025] Figure 17 A side view schematic diagram is shown when the two heat exchange shells are connected to the second heat insulation pad.

[0026] The above figures include the following reference numerals:

[0027] 10. Heat exchange shell; 11. Main body; 111. Main flow channel; 1111. First flow channel groove; 112. Inlet; 113. Second connecting hole; 12. Top plate; 121. Second branch flow channel; 1211. Third flow channel groove; 122. First clearance part; 123. Mounting groove; 13. Bottom plate; 131. Third branch flow channel; 1311. Fourth flow channel groove; 132. Second clearance part; 14. Partition; 141. First branch flow channel; 1411. Second flow channel groove; 142. First plate segment; 143. Second plate segment; 20. Battery; 21. Terminal post; 22. Explosion-proof valve; 30. First heat insulation pad; 31. Connecting part; 311. First connecting hole; 40. Battery row; 50. Second heat insulation pad. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] like Figure 1 , Figure 2 as well as Figure 5As shown, the battery pack of this embodiment includes a heat exchange shell 10 and a battery 20. The heat exchange shell 10 includes a main body 11, a top plate 12, a bottom plate 13, and multiple partitions 14. The main body 11 and each partition 14 are located between the top plate 12 and the bottom plate 13. The multiple partitions 14 are spaced apart, and each partition 14 is connected to the main body 11. The battery 20 is disposed inside the heat exchange shell 10. The battery 20 has a top surface, a bottom surface, and multiple side surfaces located between the top surface and the bottom surface. The multiple side surfaces include a first side surface and a second side surface that are opposite to each other, and a third side surface located between the first side surface and the second side surface. The main body 11 is attached to the third side surface, the top plate 12 is attached to the top surface of the battery, the bottom plate 13 is attached to the bottom surface of the battery, and the first side surface and the second side surface are respectively attached to one partition 14.

[0032] Applying the technical solution of this embodiment, the top surface of the battery 20 is attached to the top plate 12, the bottom surface of the battery 20 is attached to the bottom plate 13, the first side surface of the battery 20 is attached to a separator 14, the second side surface of the battery 20 is attached to another separator 14, and the third side surface of the battery 20 is attached to the main plate. That is, the first, second, and third sides, the top surface, and the bottom surface of the battery 20 can all be attached to the heat exchange shell 10. This allows the heat generated by the battery to be conducted through the first side surface to one separator 14, through the second side surface to another separator 14, through the third side surface to the main plate 11, through the top surface of the battery to the top plate 12, and through the bottom surface of the battery to the bottom plate 13. This increases the contact area between the battery 20 and the heat exchange shell 10, resulting in better heat dissipation of the battery 20. Therefore, the technical solution of this embodiment effectively solves the problem of poor battery heat dissipation in related technologies.

[0033] It should be noted that in this embodiment, battery 20 is a prismatic battery.

[0034] Specifically, such as Figure 9 and Figure 10 As shown, the top plate 12 and / or the bottom plate 13 are provided with mounting grooves 123, and the partitions 14 are inserted into the mounting grooves 123. There are multiple mounting grooves 123, and each mounting groove 123 corresponds to a partition 14.

[0035] In this embodiment, the mounting groove 123 is provided on the top plate 12. The partition 14 is welded to the top plate 12.

[0036] The top surface of the battery is connected to the top plate 12 by double-sided adhesive, and the bottom surface of the battery is connected to the bottom plate 13 by double-sided adhesive. Of course, in other embodiments, the top surface of the battery can also be connected to the top plate 12 by thermally conductive adhesive, and the bottom surface of the battery can be connected to the bottom plate 13 by thermally conductive adhesive.

[0037] The battery pack also includes a housing, and the heat exchange shell 10 is connected to the housing by an adhesive structure.

[0038] The adhesive structure is an adhesive layer.

[0039] like Figure 1 and Figure 15 As shown, in this embodiment, the area of ​​the third side is larger than the area of ​​the first side. The larger area of ​​the third side increases the heat dissipation area and improves the heat dissipation effect.

[0040] like Figure 6 , Figure 7 as well as Figure 16 As shown, in this embodiment, a main flow channel 111 is provided inside the main body 11, and an inlet 112 is also provided on the heat exchange shell 10. The main flow channel 111 is connected to the inlet 112. A first branch flow channel 141 is provided on the partition 14, and the first branch flow channel 141 is connected to the main flow channel 111. Fluid can enter the main flow channel 111 through the inlet 112, and then the fluid can enter the main body 11. The fluid entering the main flow channel 111 can carry away the heat generated by the battery 20, thereby achieving heat dissipation of the battery 20 and improving the heat dissipation effect of the battery 20. The first branch flow channel 141 provided on the partition 14 can carry away the heat conducted to the partition 14, thereby achieving heat dissipation of the battery 20 and improving the heat dissipation effect of the battery 20.

[0041] It should be noted that the fluid is a coolant. Of course, the fluid can also be a low-temperature gas or a refrigerant. The refrigerant can switch between the gas phase and the liquid phase.

[0042] Import 112 is located on the mainboard body 11.

[0043] like Figure 8 , Figure 11 as well as Figure 12 As shown, the partition 14 includes a first plate segment 142 and a second plate segment 143 connected to the first plate segment 142. The second plate segment 143 is disposed above the first plate segment 142 and inserted into the mounting groove 123. The width of the second plate segment 143 is smaller than the width of the first plate segment 142. The first branch channel 141 is disposed within the first plate segment 142.

[0044] like Figure 7 and Figure 8As shown, in this embodiment, a second branch channel 121 is provided inside the top plate 12, which is connected to the inlet 112. A third branch channel 131 is provided inside the bottom plate 13, which is also connected to the inlet 112. Fluid can enter the second branch channel 121 through the inlet 112, thereby carrying away the heat conducted to the top plate 12, achieving heat dissipation of the battery 20 and improving its heat dissipation effect. Fluid can also enter the third branch channel 131 through the inlet 112, thereby carrying away the heat conducted to the bottom plate 13, further improving the heat dissipation effect of the battery 20.

[0045] It should be noted that the second branch channel 121 and / or the third branch channel 131 can be directly connected to the inlet 112, or they can be connected to the inlet 112 through the main channel 111.

[0046] The heat exchange shell 10 is also provided with an outlet, which is connected to the main channel 111, and the outlet and the inlet 112 are spaced apart.

[0047] In this embodiment, the inlet 112 is located at the first end of the motherboard body 11, and the outlet is located at the second end of the motherboard body 11. In other embodiments, both the inlet 112 and the outlet may be located at the first end of the motherboard body, or both the inlet 112 and the outlet may be located at the second end of the motherboard body.

[0048] The battery pack also includes a first guide plate and a second guide plate. The first guide plate is located at the first end of the main body 11 and communicates with the inlet 112. The second guide plate is located at the second end of the main body 11 and communicates with the outlet. The first guide plate is connected to the main flow channel 111, the second branch flow channel 121, and the third branch flow channel 131. The second guide plate is also connected to the main flow channel 111, the second branch flow channel 121, and the third branch flow channel 131. Fluid can flow into the main body 11 through the first guide plate and then into the second guide plate, achieving fluid circulation.

[0049] like Figure 16 and Figure 17 As shown, in this embodiment, the battery pack also includes a first heat insulation pad 30, which is disposed between the mainboard body 11 and the third side. The first heat insulation pad 30 reduces the impact of heat generated by the battery 20 on the fluid inside the mainboard body 11, resulting in smaller temperature changes in the fluid inside the mainboard body 11, ensuring the temperature of the fluid entering the separator 14, and thus ensuring the heat dissipation effect of the separator 14.

[0050] It should be noted that the first heat insulation pad 30 can also ensure the temperature of the fluid entering the top plate 12 and the bottom plate 13, thereby ensuring the heat dissipation effect of the top plate 12 and the bottom plate 13, and thus ensuring the heat dissipation effect of the battery pack.

[0051] Specifically, such as Figure 7 , Figure 13 as well as Figure 14 As shown, the first heat insulation pad 30 is provided with a connecting part 31 so that the first branch channel 141 is connected to the main channel 111.

[0052] The main flow channel 111 includes multiple first flow channel slots 1111, the first branch flow channel 141 includes multiple second flow channel slots 1411, the second branch flow channel 121 includes at least one third flow channel slot 1211, and the third branch flow channel 131 includes at least one fourth flow channel slot 1311. The multiple first flow channel slots 1111 and the multiple second flow channel slots 1411 are arranged in a one-to-one correspondence.

[0053] like Figure 14 As shown, the connecting part 31 includes a plurality of first connecting holes 311, and the plurality of first connecting holes 311 are respectively arranged in a plurality of second flow channel grooves 1411. The outer surface of the main body 11 is also provided with a plurality of second connecting holes 113, and the plurality of second connecting holes 113 are respectively arranged in a plurality of first connecting holes 311 and a plurality of first flow channel grooves 1111. The second connecting holes 113 connect to the first flow channel grooves 1111 and the first connecting holes 311 that are respectively arranged in a plurality of first flow channel grooves 1111 and second connecting holes 113.

[0054] like Figure 16 and Figure 17 As shown, in this embodiment, the elastic modulus of the first heat insulation pad 30 is greater than or equal to 0.002 MPa and less than or equal to 2 MPa. By limiting the elastic modulus of the first heat insulation pad 30, the first heat insulation pad 30 is made deformable, so that when the battery 20 is charging, the third side can squeeze the first heat insulation pad 30, avoiding the third side directly squeezing the main board body 11. That is, by setting the first heat insulation pad 30, the battery 20 has a certain expansion space.

[0055] The elastic modulus of the first heat insulation pad 30 can be 0.002MPa, 0.01MPa, 0.02MPa, 0.05MPa, 0.07MPa, 0.10MPa, 0.12MPa, 0.13MPa, 0.16MPa, 0.21MPa, 0.23MPa, 0.25MPa, 0.31MPa, 0.35MPa, 0.39MPa, 0.42MPa, 0.44MPa, 0.5MPa, 0.53MPa, 0.59MPa, 0.65MPa, 0.68MPa, 0.71MPa, 0.74MPa, 0.76MPa, 0. The pressure ratings are 82 MPa, 0.85 MPa, 0.89 MPa, 0.92 MPa, 0.95 MPa, 1 MPa, 1.03 MPa, 1.09 MPa, 1.12 MPa, 1.16 MPa, 1.25 MPa, 1.29 MPa, 1.32 MPa, 1.34 MPa, 1.42 MPa, 1.47 MPa, 1.51 MPa, 1.55 MPa, 1.61 MPa, 1.65 MPa, 1.68 MPa, 1.72 MPa, 1.76 MPa, 1.82 MPa, 1.85 MPa, 1.90 MPa, 1.95 MPa, or 2 MPa. In this embodiment, the elastic modulus of the first heat insulation pad 30 is 0.5 MPa.

[0056] like Figure 16 and Figure 17 As shown, in this embodiment, the ratio of the thickness H1 of the first heat insulation pad 30 to the thickness H2 of the main board body 11 satisfies: 0.008 ≤ H1 / H2 ≤ 50. By limiting the thickness H1 of the first heat insulation pad 30 and the thickness H2 of the main board body 11, it is possible to ensure that the first heat insulation pad 30 has a certain deformation capability, and it is also possible to prevent the main board body 11 from being deformed by the battery 20, which would affect the stability of the battery pack.

[0057] The ratio of the thickness H1 of the first heat insulation pad 30 to the thickness H2 of the main board body 11 can be 0.008, 0.1, 0.36, 0.5, 1, 2, 3, 4, 5, 6.5, 7, 8, 9, 10, 11, 12, 13, 14, 15.6, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29.5, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41.7, 42, 43, 44, 45, 46.3, 47, 48, 49, or 50. In this embodiment, the ratio of the thickness H1 of the first heat insulation pad 30 to the thickness H2 of the main board body 11 is 0.36.

[0058] like Figure 5 and Figure 15As shown, in this embodiment, the separator 14 includes at least three, and the battery includes at least two. A battery 20 is disposed between any two adjacent separators 14. By defining the relative positions of the battery 20 and the plurality of separators 14, two batteries 20 can share the separator 14 disposed between the two batteries 20, which can maintain the heat dissipation effect of the battery 20 and improve the space utilization of the heat exchange shell 10.

[0059] like Figure 3 As shown, in this embodiment, multiple batteries 20 are arranged along a first preset direction to form a battery array 40. Both the heat exchange housing 10 and the battery array 40 include multiple units, with each heat exchange housing 10 corresponding to one of the multiple battery arrays 40. Each battery 20 in each battery array 40 is housed within the corresponding heat exchange housing 10. Through this arrangement, the heat generated by the batteries 20 in each battery array 40 can be dissipated through the corresponding heat exchange housing 10, preventing the accumulation of heat generated by the batteries 20, improving the heat dissipation effect of the battery array 40, and thus improving the heat dissipation effect of the battery pack.

[0060] The battery pack also includes multiple support rods, which are positioned between the multiple heat exchange shells 10 and the housing. A support rod is located below the junction of any two adjacent batteries 20 in any battery row 40. This improves the overall structural strength of the battery pack.

[0061] Each main body includes multiple first and second guide vanes, with one first guide vane and one second guide vane corresponding to each main body. The multiple first guide vanes are interconnected, and the multiple second guide vanes are interconnected.

[0062] like Figure 2 and Figure 3 As shown, in this embodiment, multiple heat exchange shells 10 are arranged parallel to each other in a second preset direction. Two adjacent battery columns 40 include a first battery column and a second battery column. Multiple battery sides also include a fourth side opposite to the third side. The third side of all batteries 20 in the first battery column is disposed on the first side of the main board body 11 located between the first and second battery columns. The fourth side of all batteries 20 in the second battery column is disposed on the second side of the main board body 11 located between the first and second battery columns. The first and second sides of the main board body 11 are opposite to each other. The third side of all batteries 20 in the first battery column and the fourth side of all batteries 20 in the second battery column share a single main board body 11. This improves the surface utilization of the main board body 11, allowing the heat exchange shells 10 located between the first and second battery columns to simultaneously dissipate heat from both columns, thus improving the heat dissipation effect of the batteries 20.

[0063] like Figure 16 and Figure 17 As shown, in this embodiment, the battery pack further includes a second heat insulation pad 50. The second heat insulation pad 50 and the first heat insulation pad 30 are located on opposite sides of the main board 11. The second heat insulation pad 50 is disposed between the fourth side of the second battery array and the main board 11 located between the first and second battery arrays. The second heat insulation pad 50 is provided so that when the fourth side of the battery 20 deforms, it can be squeezed, preventing direct compression of the main board 11. In other words, the second heat insulation pad 50 provides expansion space for the deformation of the battery 20, thus improving the safety of the battery pack.

[0064] like Figure 16 and Figure 17 As shown, in this embodiment, the ratio of the thickness H1 of the first heat insulation pad 30 to the thickness H3 of the second heat insulation pad 50 satisfies: 0.005 ≤ H1 / H3 ≤ 5. By limiting the ratio of the thickness H1 of the first heat insulation pad 30 to the thickness H3 of the second heat insulation pad 50, the deformation capacity of the first heat insulation pad 30 and the second heat insulation pad 50 can be made more reasonable. It can also prevent the first heat insulation pad 30 from affecting the heat dissipation of the third side of the battery 20, and prevent the second heat insulation pad 50 from affecting the heat dissipation of the fourth side of the battery 20.

[0065] The ratio of the thickness H1 of the first heat insulation pad 30 to the thickness H3 of the second heat insulation pad 50 can be 0.005, 0.01, 0.15, 0.22, 0.23, 0.25, 0.32, 0.36, 0.4, 0.42, 0.5, 0.52, 0.54, 0.59, 1, 1.02, 1.5, 1.52, 1.54, 1.55, 1.57, 1.59, 2.1, 2.3, 2.5, 2.7, 3, 3.1, 3.4, 3.6, 3.9, 4.1, 4.2, 4.4, or 5. In this embodiment, the ratio of the thickness H1 of the first heat insulation pad 30 to the thickness H3 of the second heat insulation pad 50 is 0.36.

[0066] like Figure 5 As shown, in this embodiment, the top plate 12 is also provided with a first clearance part 122, which avoids the terminal post 21 of the battery 20. The provision of the first clearance part 122 can ensure the electrical connection of the battery 20.

[0067] It should be noted that the first clearance portion 122 can be a first clearance notch or a first clearance hole. In this embodiment, the first clearance portion 122 is a first clearance notch.

[0068] like Figure 4 and Figure 5As shown, in this embodiment, a second clearance portion 132 is also provided on the top plate 12 or the bottom plate 13, which avoids the explosion-proof valve 22 of the battery 20. The second clearance portion 132 can avoid the explosion-proof valve 22 and prevent the bottom plate 13 from interfering with the operation of the explosion-proof valve 22.

[0069] It should be noted that the second clearance portion 132 can be a second clearance notch or a second clearance hole. In this embodiment, the second clearance portion 132 is a second clearance notch.

[0070] In other embodiments, the second clearance portion 132 is disposed on the top plate body 12.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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).

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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).

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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).

[0087] 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).

[0088] 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.

[0089] 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.

[0090] The electrical device of this embodiment includes a battery pack, which is the battery pack described above. The heat exchange shell of the battery pack can be in contact with the first side, second side, third side, top surface, and bottom surface of the battery, so that the heat generated by the battery 20 can be dissipated through the main board 11, top plate 12, bottom plate 13, and multiple separators 14, thereby improving the heat dissipation effect of the battery 20. The electrical device with the battery pack described above also has the advantages mentioned above.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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, include: The heat exchange shell (10) includes a main body (11), a top plate (12), a bottom plate (13), and a plurality of partitions (14). The main body (11) and each of the partitions (14) are located between the top plate (12) and the bottom plate (13). The plurality of partitions (14) are spaced apart, and each partition (14) is connected to the main body (11). A battery (20) is disposed inside the heat exchange shell (10). The battery (20) has a top surface, a bottom surface, and a plurality of side surfaces located between the top surface and the bottom surface. The plurality of side surfaces include a first side surface and a second side surface that are opposite to each other, and a third side surface located between the first side surface and the second side surface. The main board body (11) is attached to the third side, the top plate body (12) is attached to the top surface of the battery, the bottom plate body (13) is attached to the bottom surface of the battery, and the first side and the second side are respectively attached to a partition (14).

2. The battery pack according to claim 1, characterized in that, The area of ​​the third side is greater than the area of ​​the first side.

3. The battery pack according to claim 1, characterized in that, The main body (11) is provided with a main channel (111), and the heat exchange shell (10) is also provided with an inlet (112). The main channel (111) is connected to the inlet (112). The partition (14) is provided with a first branch channel (141), and the first branch channel (141) is connected to the main channel (111).

4. The battery pack according to claim 3, characterized in that, The top plate (12) is provided with a second branch channel (121) which is connected to the inlet (112), and / or the bottom plate (13) is provided with a third branch channel (131) which is connected to the inlet (112).

5. The battery pack according to claim 1, characterized in that, The battery pack also includes a first heat insulation pad (30), which is disposed between the main body (11) and the third side.

6. The battery pack according to claim 5, characterized in that, The elastic modulus of the first heat insulation pad (30) is greater than or equal to 0.002 MPa and less than or equal to 2 MPa.

7. The battery pack according to claim 5, characterized in that, The ratio of the thickness H1 of the first heat insulation pad (30) to the thickness H2 of the main body (11) satisfies: 0.008≤H1 / H2≤50.

8. The battery pack according to any one of claims 1 to 7, characterized in that, The separator (14) includes at least three, the battery includes at least two, and a battery (20) is disposed between any two adjacent separators (14).

9. The battery pack according to any one of claims 5 to 7, characterized in that, Multiple batteries (20) are arranged along a first preset direction to form a battery column (40). Both the heat exchange shell (10) and the battery column (40) include multiple batteries. The multiple heat exchange shells (10) are arranged one-to-one with the multiple battery columns (40). The batteries (20) of each battery column (40) are arranged in the heat exchange shell (10) corresponding to that battery column (40).

10. The battery pack according to claim 9, characterized in that, Multiple heat exchange shells (10) are arranged in parallel in a second preset direction. Two adjacent battery columns (40) include a first battery column and a second battery column. Multiple battery sides also include a fourth side opposite to the third side. The third side of all the batteries (20) in the first battery column is disposed on the first side of the main board body (11) located between the first battery column and the second battery column. The fourth side of all the batteries (20) in the second battery column is disposed on the second side of the main board body (11) located between the first battery column and the second battery column. The first side and the second side of the main board body (11) are opposite to each other.

11. The battery pack according to claim 10, characterized in that, The battery pack also includes a second heat insulation pad (50), which and the first heat insulation pad (30) are located on opposite sides of the main board body (11), and the second heat insulation pad (50) is disposed between the fourth side of each battery in the second battery column and the main board body (11) located between the first battery column and the second battery column.

12. The battery pack according to claim 11, characterized in that, The ratio of the thickness H1 of the first heat insulation pad (30) to the thickness H3 of the second heat insulation pad (50) satisfies: 0.005≤H1 / H3≤5.

13. The battery pack according to any one of claims 1 to 7, characterized in that, The top plate (12) is also provided with a first clearance part (122), which avoids the terminal post (21) of the battery (20).

14. The battery pack according to any one of claims 1 to 7, characterized in that, A second clearance part (132) is also provided on the top plate (12) or the bottom plate (13), the second clearance part (132) clearances the explosion-proof valve (22) of the battery (20).

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

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