Battery pack and electric device with same

Abstract

The invention provides a battery pack and a power utilization device with the battery pack, and the battery pack comprises a bottom plate; the battery is arranged above the bottom plate, and the battery is provided with a battery bottom surface facing the bottom plate and a first side surface connected with the battery bottom surface; the heat exchange plate comprises a first plate body part and a second plate body part connected with the first plate body part, the first plate body part is arranged between the bottom surface of the battery and the bottom plate and covers a part of area of the bottom surface of the battery, and the second plate body part is arranged on the first side surface of the battery; the area, not covered with the first plate body part, of the bottom surface of the battery is connected with the bottom plate through the bonding structure. According to the technical scheme, the problem of poor heat dissipation effect of the battery pack in the related technology is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a battery pack and an electrical device having the same. Background Art

[0002] Currently, with the increasing demand for battery charging speeds, battery fast charging technology has been widely used. However, during the fast charging process, the heat generated by the battery increases dramatically. If the heat is not dissipated in time, it may pose a safety risk.

[0003] In the prior art, in order to achieve heat dissipation of the battery, a heat dissipation structure is generally provided in the battery pack. However, during fast charging, the heat dissipation capacity of the heat dissipation structure cannot match the heat generated by the battery, resulting in poor heat dissipation effect of the battery pack. Summary of the Invention

[0004] The main purpose of the present invention is to provide a battery pack and an electrical device having the same, so as to solve the problem of poor heat dissipation of the battery pack in the related art.

[0005] To achieve the above-mentioned objective, according to one aspect of the present invention, there is provided a battery pack, comprising: a base plate; a battery, wherein the battery is arranged above the base plate, the battery having a battery bottom surface facing the base plate and a first side surface connected to the battery bottom surface; a heat exchange plate, wherein the heat exchange plate comprises a first plate body portion and a second plate body portion connected to the first plate body portion, the first plate body portion being arranged between the battery bottom surface and the base plate and covering a portion of the battery bottom surface, and the second plate body portion being arranged at the first side surface of the battery; and an adhesive structure, wherein the area of ​​the battery bottom surface not covered by the first plate body portion is connected to the base plate via the adhesive structure.

[0006] According to another aspect of the present invention, there is provided an electrical device including a battery pack, wherein the battery pack is the battery pack described above.

[0007] Applying the technical solution of the present invention, a battery pack includes a base plate, a battery disposed above the base plate, a heat exchange plate, and an adhesive structure. The battery has a bottom surface and a first side surface, with the bottom surface facing the base plate and connected to the first side surface. The heat exchange plate includes a first plate portion disposed between the battery bottom surface and the base plate, and a second plate portion disposed on the first side surface of the battery. The first plate portion is connected to the second plate portion, and the first plate portion covers a portion of the battery bottom surface. The area of ​​the battery bottom surface not covered by the first plate portion is connected to the base plate via an adhesive structure. Through this arrangement, the base plate can support the battery and the heat exchange plate. The battery can cooperate with the heat exchange plate in heat exchange, that is, the heat generated by the battery can be conducted through the first plate portion and the second plate portion to achieve heat dissipation from the battery, thereby improving the heat dissipation effect of the battery. The area of ​​the battery bottom surface not covered by the first plate portion is connected to the base plate via an adhesive structure, which allows the battery to be more stably mounted on the base plate. Therefore, the technical solution of this application effectively solves the problem of poor heat dissipation of battery packs in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0009] Figure 1 shows a schematic diagram of the three-dimensional structure of a battery pack according to embodiment 1 of the present invention;

[0010] Figure 2 Shown Figure 1 A schematic diagram of the three-dimensional structure of multiple battery columns of a battery pack;

[0011] Figure 3 Shown Figure 2 A partial enlarged schematic diagram of the battery pack;

[0012] Figure 4 Shown Figure 2 A schematic diagram of a three-dimensional structure of multiple battery columns of a battery pack from another perspective;

[0013] Figure 5 Shown Figure 2 A schematic side view of multiple battery columns of a battery pack;

[0014] Figure 6 Shown Figure 5 A partial enlarged schematic diagram of point B of the battery pack;

[0015] Figure 7 Shown Figure 2 A schematic diagram of the three-dimensional structure of a battery column of a battery pack;

[0016] Figure 8Shown Figure 1 A schematic diagram of the three-dimensional structure of the heat exchange plate of the battery pack;

[0017] Figure 9 Shown Figure 1 A schematic side view of a battery pack in which a battery column and a base plate are connected via an adhesive structure;

[0018] Figure 10 A side schematic diagram of a heat exchange plate of a second embodiment of a battery pack according to the present invention is shown.

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

[0020] 10. Bottom plate; 20. Battery; 30. Heat exchange plate; 31. First plate body; 32. Second plate body; 33. Third plate body; 34. Fourth plate body; 35. Fifth plate body; 36. Heat exchange channel; 40. Adhesive structure; 50. Battery array; 60. Explosion-proof valve; 70. Heat conductive layer; 80. Thermal insulation pad. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0024] like Figure 1 、 Figure 2 as well as Figure 9 As shown, the battery pack of the first embodiment includes: a base plate 10, a battery 20, a heat exchange plate 30, and an adhesive structure 40. The battery 20 is arranged above the base plate 10, and has a battery bottom surface facing the base plate 10 and a first side surface connected to the battery bottom surface. The heat exchange plate 30 includes a first plate body 31 and a second plate body 32 connected to the first plate body 31. The first plate body 31 is arranged between the battery bottom surface and the base plate 10 and covers a portion of the battery bottom surface. The second plate body 32 is arranged on the first side surface of the battery 20. The area of ​​the battery bottom surface not covered by the first plate body 31 is connected to the base plate 10 via the adhesive structure 40.

[0025] Applying the technical solution of Example 1, the battery pack includes a base plate 10, batteries 20 disposed above the base plate 10, a heat exchange plate 30, and an adhesive structure 40. The battery 20 has a bottom surface and a first side surface, with the bottom surface facing the base plate 10 and connected to the first side surface. The heat exchange plate 30 includes a first plate portion 31 disposed between the battery bottom surface and the base plate 10, and a second plate portion 32 disposed on the first side surface of the battery. The first plate portion 31 is connected to the second plate portion 32, and the first plate portion 31 covers a portion of the battery bottom surface. The area of ​​the battery bottom surface not covered by the first plate portion 31 is connected to the base plate 10 via the adhesive structure 40. This arrangement enables the base plate 10 to support the batteries 20 and the heat exchange plate 30. The batteries 20 can cooperate in heat exchange with the heat exchange plate 30. That is, heat generated by the batteries 20 can be conducted through the first plate portion 31 and the second plate portion 32, thereby dissipating heat from the batteries 20 and improving heat dissipation. The area of ​​the battery bottom surface not covered by the first plate portion 31 is connected to the base plate 10 via the adhesive structure 40, so that the battery 20 can be more stably placed on the base plate 10. Therefore, the technical solution of the first embodiment effectively solves the problem of poor heat dissipation of the battery pack in the related art.

[0026] It should be noted that, in the first embodiment, the battery 20 is a square-shell battery.

[0027] Specifically, the first plate portion 31 and the second plate portion 32 form an L-shaped structure.

[0028] It should be noted that the bonding structure 40 is a glue layer. The battery 20 and the first plate portion 31 are connected by double-sided adhesive. Of course, the battery 20 and the first plate portion 31 can also be connected by thermal conductive adhesive.

[0029] The battery pack further includes a box body, and the bottom plate 10 is a partial structure of the box body.

[0030] like Figure 9 As shown, in the first embodiment, the battery 20 further has a second side surface disposed opposite the first side surface. The distance between the first and second side surfaces is distance L. The dimension of the first plate portion 31 in the direction from the first side surface to the second side surface is dimension a, where the ratio of dimension a to distance L satisfies the following: 0.05 ≤ a / L ≤ 0.9. By limiting the ratio of dimension a to distance L, the connection between the battery 20 and the base plate 10 is not only strengthened, but also a certain contact area between the battery 20 and the first plate portion 31 is ensured, ensuring that heat from the battery 20 can be dissipated through the first plate portion 31. This achieves both a stable connection between the battery 20 and the base plate 10 and improved heat dissipation from the battery 20.

[0031] It should be noted that the ratio a / L of the dimension a to the distance L may be: 0.05, 0.07, 0.09, 0.1, 0.12, 0.15, 0.16, 0.18, 0.19, 0.22, 0.23, 0.24, 0.25, 0.26, 0.29, 0.31, 0.33, 0.34, 0.37, 0.39, 0.43, 0.44, 0.45, 0.47, 0.48, 0.49, 0.52, 0.61, 0.68, 0.69, 0.71, 0.72, 0.73, 0.74, 0.75, 0.8, 0.82, 0.84, 0.87, 0.88 or 0.9. In the first embodiment, the ratio a / L of the dimension a to the distance L is 0.29.

[0032] It should be noted that in the first embodiment, the direction from the first side surface of the battery 20 to the second side surface of the battery 20 is the width direction of the battery 20. The dimension of the first plate portion 31 in the direction from the first side surface to the second side surface refers to the distance between the two side surfaces of the first plate portion 31 in the width direction.

[0033] In the first embodiment, the side of the first plate portion 31 facing the bottom plate 10 is connected to the bottom plate 10 via the adhesive structure 40. This allows the first plate portion 31 to be connected to the bottom plate 10, thereby improving the structural strength of the battery pack.

[0034] like Figure 2 and Figure 4 As shown, in embodiment 1, there are multiple batteries 20, and each battery 20 also includes two end faces located between the first side surface and the second side surface. The multiple batteries 20 are arranged along a first preset direction and form a battery column 50. The end faces of two adjacent batteries 20 in the battery column 50 are arranged relative to each other, and all batteries in the battery column 50 share the same heat exchange plate 30. The provision of multiple batteries 20 can increase the energy storage capacity of the battery pack. The end faces of two adjacent batteries 20 in the battery column 50 are arranged relative to each other, which makes the relative position between the two adjacent batteries 20 more stable, and thus the relative position between the battery 20 and the bottom plate 10 can also be stable. The battery column 50 shares the same heat exchange plate 30, which can improve the utilization rate of the heat exchange plate 30 and enhance the heat dissipation effect of the battery column 50.

[0035] It should be noted that, in the first embodiment, the areas of the two end surfaces of the battery 20 are the same.

[0036] Both end surfaces of the battery 20 are connected to the top surface of the battery, and both end surfaces of the battery 20 are connected to the bottom surface of the battery. Specifically, the two end surfaces of the battery 20 located between the first side surface and the second side surface are the third side surface and the fourth side surface, respectively. The third side surface is connected to both the top and bottom surfaces of the battery, and the fourth side surface is connected to both the top and bottom surfaces of the battery. In a battery column 50, the third side surface of one of the two adjacent batteries 20 is positioned in contact with the fourth side surface of the other battery 20.

[0037] like Figure 2 、 Figure 4 as well as Figure 7 As shown, in the first embodiment, the area of ​​the first side surface is larger than the area of ​​the end surface. The third side surface has a larger area, which can increase the heat dissipation area, thereby allowing the heat generated by the battery 20 to be dissipated in time, thereby improving the heat dissipation effect of the battery 20.

[0038] It should be noted that, in the first embodiment, the area of ​​the second side surface is greater than the area of ​​the end surface.

[0039] It should be noted that, in other embodiments, the first side surface and the second side surface may also be sides with smaller areas, that is, the area of ​​the first side surface is smaller than the area of ​​the end surface, and the area of ​​the second side surface is smaller than the area of ​​the end surface.

[0040] like Figure 2 and Figure 4 As shown, in Example 1, there are multiple heat exchange plates 30 and multiple battery arrays 50. The multiple heat exchange plates 30 are arranged in a one-to-one correspondence with the multiple battery arrays 50. The multiple heat exchange plates 30 are arranged sequentially in a second preset direction perpendicular to the first preset direction. The multiple battery arrays 50 enable the battery pack to store more energy. The multiple heat exchange plates 30 are arranged in a one-to-one correspondence with the multiple battery arrays 50. This ensures that each battery array 50 is equipped with a corresponding heat exchange plate 30, thereby allowing the heat generated by the batteries 20 in the battery array 50 to be promptly discharged through the heat exchange plates 30.

[0041] It should be noted that the plurality of battery columns 50 are arranged in parallel.

[0042] The first preset direction is parallel to the length direction of the heat exchange plate. The first preset direction is parallel to the length direction of the battery.

[0043] The battery array 50 is disposed in the box.

[0044] The battery pack further includes a plurality of support rods, which are spaced apart in a first preset direction and disposed between the plurality of heat exchange plates 30 and the bottom plate 10. Each support rod extends along a second preset direction.

[0045] Each support rod is provided with multiple mounting grooves, and the multiple mounting grooves are arranged one-to-one corresponding to the multiple heat exchange plates 30. Part of the structure of the first plate body 31 of the heat exchange plate 30 is arranged in the mounting groove, so that the relative position between the multiple heat exchange plates 30 is more stable, and thus the relative position between the multiple battery columns 50 is more stable.

[0046] like Figure 2 、 Figure 4 as well as Figure 5 As shown, in Example 1, a heat exchange plate 30 is disposed between two adjacent battery columns 50. The two adjacent battery columns 50 include a first battery column and a second battery column. The batteries 20 further have a second side surface disposed opposite the first side surface. The first side surface of all batteries 20 in the first battery column is disposed on the first side of the second plate portion 32 located between the first and second battery columns. The second side surface of all batteries 20 in the second battery column is disposed on the second side of the second plate portion 32 located between the first and second battery columns. The first side of the second plate portion 32 and the second side of the second plate portion 32 are disposed opposite each other. The heat exchange plate 30 is disposed between two adjacent battery columns 50. This improves the arrangement of multiple battery columns 50 and multiple heat exchange plates 30, enabling battery columns 50 disposed on both sides of a single heat exchange plate 30 to exchange heat with the plate 30, thereby improving heat dissipation for the batteries 20.

[0047] It should be noted that relative setting refers to setting in opposite directions.

[0048] like Figures 6 to 8 As shown, in the first embodiment, the heat exchange plate 30 further includes a third plate portion 33. The second plate portion 32 is connected between the first plate portion 31 and the third plate portion 33. The third plate portion 33 is in contact with the top surface of the battery 20. The third plate portion 33 in contact with the top surface of the battery allows some of the heat generated by the battery 20 to be conducted through the third plate portion 33, thereby improving the heat dissipation effect of the battery 20. The second plate portion 32 connects the first plate portion 31 and the third plate portion 33.

[0049] It should be noted that the first plate portion 31, the second plate portion 32, and the third plate portion 33 are integrally formed. The first plate portion 31, the second plate portion 32, and the third plate portion 33 form a C-shaped structure. Of course, in other embodiments, the first plate portion 31, the second plate portion 32, and the third plate portion 33 are separate structures that are processed separately and then connected.

[0050] The third plate portion 33 covers a portion of the top surface of the battery.

[0051] The third plate portion 33 avoids the terminals of the battery 20 .

[0052] like Figure 4 and Figure 9 As shown, in Example 1, the battery also has an explosion-proof valve 60 disposed on the bottom surface of the battery. The first plate portion 31 clears the explosion-proof valve 60, and a clearance portion is provided on the bonding structure 40 to clear the explosion-proof valve 60. The ratio of dimension a to distance L satisfies the following: 0.05 ≤ a / L ≤ 0.45. A heat exchange flow channel 36 is provided within the heat exchange plate 30. The explosion-proof valve 60 ensures that energy generated by thermal runaway of the battery 20 is promptly discharged through the explosion-proof valve 60. The second plate portion 32 clears the explosion-proof valve 60, ensuring its proper operation. The presence of the explosion-proof valve 60 on the bottom surface of the battery and the clearance of the second plate portion 32 reduce the connection area between the bottom surface of the battery and the base plate 10. By limiting the ratio of dimension a to distance L, the connection area between the bottom surface of the battery and the base plate 10 is more reasonable, thereby ensuring a more stable connection between the bottom surface of the battery and the base plate 10, and the second plate portion effectively clears the explosion-proof valve. A heat exchange channel 36 is provided in the heat exchange plate 30 to allow the fluid to flow in the heat exchange plate 30 . When the fluid flows, the flow conducted to the heat exchange plate 30 can be promptly taken out, thereby achieving heat dissipation of the battery 20 .

[0053] The heat exchange channel 36 includes a first channel structure, a second channel structure and a third channel structure. The first channel structure is arranged in the first plate body 31 , the second channel structure is arranged in the second plate body 32 , and the third channel structure is arranged in the third plate body 33 .

[0054] The first flow channel structure includes a plurality of first flow channel grooves, the second flow channel structure includes at least one second flow channel groove, and the third flow channel structure includes at least one third flow channel groove.

[0055] The plurality of first flow channel grooves are connected between the fluid inlet and the fluid outlet. The second flow channel grooves are connected between the fluid inlet and the fluid outlet. The third flow channel grooves are connected between the fluid inlet and the fluid outlet.

[0056] The fluid is a coolant. Of course, the fluid can also be a low-temperature gas or a refrigerant. The refrigerant can be converted between gas phase and liquid phase.

[0057] like Figure 3 and Figure 6 As shown, in the first embodiment, the battery pack further includes a thermally conductive layer 70, which is disposed on the second plate portion 32 and located between the first side surface of the battery 20 and the second plate portion 32. Heat generated by the battery 20 can be conducted to the thermally conductive layer 70 via the first side surface of the battery 20, and then to the second plate portion 32 via the thermally conductive layer 70, thereby improving the heat exchange efficiency between the battery 20 and the second plate portion 32 and achieving better heat dissipation from the battery 20.

[0058] It should be noted that the thermally conductive layer 70 may be a thermally conductive pad having the same length as the second plate portion 32. Of course, the thermally conductive layer 70 may also include multiple thermally conductive pads, which are spaced apart along the length of the second plate portion 32. The thermally conductive layer 70 may also be a gel-like thermally conductive adhesive, which is applied to the second plate portion 32.

[0059] like Figure 3 and Figure 6 As shown, in the first embodiment, the battery pack further includes a thermal insulation pad 80, which is located on both sides of the second plate portion 32 along with the thermal conductive layer 70. The provision of the thermal insulation pad 80 can prevent heat from the outside of the heat exchange plate 30 from exchanging heat with the second plate portion 32, thereby affecting the heat dissipation of the battery 20.

[0060] It should be noted that the thermal insulation pad 80 is disposed between the second side surfaces of all batteries in the second battery column and the second plate portion 32 of the heat exchange plate 30. This can reduce the effect of the heat from the batteries 20 in the second battery column on the fluid within the heat exchange plate 30 corresponding to the first battery column, thereby avoiding affecting the heat dissipation effect of the batteries 20 in the first battery column.

[0061] The difference between the second embodiment and the first embodiment is that the heat exchange plate 30 further includes a fourth plate body 34 and a fifth plate body 35 .

[0062] like Figure 10As shown, in the second embodiment, the third plate portion 33 is bonded to the top surface of the batteries 20 in the first battery column. The heat exchange plate 30 located between the two battery columns 50 further includes a fourth plate portion 34 and a fifth plate portion 35. The fourth plate portion 34 is connected to the second plate portion 32 and is located on either side of the third plate portion 33. The fourth plate portion 34 is bonded to the top surface of the batteries 20 in the second battery column. The fifth plate portion 35 is connected to the second plate portion 32 and is located on either side of the first plate portion 31. The fifth plate portion 35 is bonded to the bottom surface of the batteries in the second battery column. The fourth plate portion 34 is bonded to the top surface of the batteries 20 in the second battery column, allowing heat from the top surfaces of the batteries 20 in the second battery column to be dissipated through the two heat exchange plates 30 adjacent to the second battery column, thereby improving heat dissipation from the batteries 20. The fifth plate portion 35 is in contact with the bottom surface of the battery 20 of the second battery column, so that the heat of the bottom surface of the battery 20 of the second battery column can be discharged through the two heat exchange plates 30 adjacent to the second battery column, thereby improving the heat dissipation effect of the battery 20.

[0063] It should be noted that in the second preset direction, the outermost heat exchange plate 30, that is, the second plate body 32 of this heat exchange plate 30 is provided with a battery column on the side close to the first plate body 31, and no battery column is provided on the side away from the first plate body 31, and the fourth plate body 34 and the fifth plate body 35 are not provided on the heat exchange plate 30.

[0064] The fifth plate portion 35 avoids the terminals of the battery 20 .

[0065] The heat exchange flow channel 36 further includes a fourth flow channel structure and a fifth flow channel structure. The fourth flow channel structure is disposed in the fourth plate portion 34 , and the fifth flow channel structure is disposed in the fifth plate portion 35 .

[0066] The fourth flow channel structure includes at least one fourth flow channel groove, and the fifth flow channel structure includes at least one fifth flow channel groove.

[0067] The fourth flow channel groove is connected between the fluid inlet and the fluid outlet. The fifth flow channel groove is connected between the fluid inlet and the fluid outlet.

[0068] In the second predetermined direction, the outermost two battery columns of the plurality of battery columns are the third and fourth battery columns. No heat exchange plates are provided on the second side surfaces of all batteries 20 in the third battery column. The battery pack also includes a heat sink disposed on the second side surfaces of all batteries 20 in the outermost battery column 50. The heat sink is in contact with the second side surfaces of all batteries 20 in the third battery column.

[0069] The heat exchange plate 30 corresponding to the fourth battery column is not provided with the fourth plate body 34 and the fifth plate body 35 .

[0070] The difference between the third embodiment and the first embodiment lies in that the ratio of the dimension a to the distance L is different.

[0071] like Figure 9 As shown, in the third embodiment, the ratio of dimension a to distance L satisfies: 0.05≤a / L≤1.2. By limiting the ratio of dimension a to distance L, the connection strength between the first plate portion 31 and the bottom plate 10 is improved, thereby improving the overall structural strength of the battery pack.

[0072] In the third embodiment, the ratio a / L of the size a to the distance L can be: 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.12, 0.14, 0.17, 0.18, 0.19, 0.21, 0.26, 0.27, 0.29, 0.3, 0.33, 0.36, 0.37, 0.41, 0.43, 0.45, 0.47, 0.48, 0.49, 0.5, 0.51, 0.53, 0.55, 0.59, 0.61, 0.63, 0.65, 0.66, 0.68, 0.69, 0.7, 0.71, 0.76, 0.78, 0.8, 0.82, 0.83, 0.87, 0.89, 0.91, 0.93, 0.95, 0.96, 0.97, 1.07, 1.12, 1.14, 1.15 or 1.2.

[0073] It should be noted that 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 recharged to activate the active material after the battery is discharged and continue to be used.

[0074] Typically, a secondary battery includes an electrode assembly, an electrolyte, and an outer packaging shell. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. The electrode assembly and the electrolyte are assembled in the outer packaging shell. During the battery charging and discharging process, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode sheet and the negative electrode sheet. The separator is set between the positive electrode sheet and the negative electrode sheet, mainly to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through. The electrolyte between the positive electrode sheet and the negative electrode sheet mainly plays the role of conducting active ions.

[0075] As an example, the preparation process of a secondary battery is as follows: stack the positive electrode sheet, separator, and negative electrode sheet in order, so that the separator is placed between the positive and negative electrode sheets to act as an isolate, and then wind or stack them to obtain an electrode assembly; place the electrode assembly in an outer packaging shell, inject the electrolyte after drying, and obtain a secondary battery through vacuum packaging, standing, formation, shaping and other processes.

[0076] The positive electrode sheet generally includes a positive electrode current collector and a positive electrode film layer arranged on at least one side of the positive electrode current collector. The positive electrode film layer includes a positive electrode active material, which can be any positive electrode active material disclosed in the prior art or a positive electrode active material optimized on the basis of the prior art.

[0077] The present application does not particularly limit the type of positive electrode active material of the positive electrode sheet. As an example, the positive electrode active material in the present invention includes lithium-containing transition metal oxides (for example: LiCoO2), phosphides (for example: LiFePO4) or lithium-intercalated compounds (for example: lithium cobalt oxide, lithium nickel oxide and other binary lithium battery positive electrode materials, or lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide and other ternary lithium battery positive electrode materials).

[0078] In some embodiments, the positive electrode sheet can be prepared by the following method: the components for preparing the positive electrode sheet, such as the positive electrode active material, the conductive agent, the binder and any other components, are dispersed in a solvent (for example, N-methylpyrrolidone) to form a positive electrode slurry; the positive electrode slurry is coated on the positive electrode current collector, and after drying, rolling, cutting and other processes, the positive electrode sheet can be obtained.

[0079] In this application, the binder is used to improve the adhesion between the positive electrode active material particles and the adhesion between the positive electrode active material and the current collector. This application does not particularly limit the type of binder for the positive electrode sheet. In this application, the binder can be a conventional choice in the battery field. 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.

[0080] The present application has no particular limitation on the positive electrode current collector, as long as it has conductivity and does not cause adverse chemical changes in the battery, and can use, for example: stainless steel, aluminum, nickel, titanium, fired carbon; or aluminum or stainless steel surface-treated with one of carbon, nickel, titanium, silver, etc.

[0081] The negative electrode sheet 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 includes a silicon-based material. The present 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 a silicon-carbon composite negative electrode material, a silicon monoxide negative electrode material, a modified silicon monoxide negative electrode material, and a nano-silicon material. The negative electrode active material in the negative electrode active material layer can also optionally include one or more of artificial graphite, natural graphite, and hard carbon.

[0082] In some embodiments, the negative electrode sheet can be prepared by the following method: the components for preparing the negative electrode sheet, such as the negative electrode active material, the conductive agent, the binder and any other components, are dispersed in a solvent (such as water) to form a negative electrode slurry; the negative electrode slurry is coated on the negative electrode current collector, and after drying, rolling, cutting and other processes, the negative electrode sheet can be obtained.

[0083] The present application has no specific limitation on the type of negative electrode conductive agent. In some embodiments, as an example, the negative electrode conductive agent can be one or more conventional negative electrode conductive agents such as acetylene black and carbon nanotubes.

[0084] The present application has no specific limitation on the type of negative electrode binder. In some embodiments, as an example, the binder can be one or more conventional negative electrode binders such as styrene-butadiene rubber latex (SBR), polyvinylidene fluoride (PVDF), polyacrylic acid (PAA), sodium carboxymethyl cellulose (CMC), etc.; in the present application, the binder is preferably PAA, SBR and CMC, and the mass ratio of PAA, SBR and CMC can be (34.38-74.29): (20-59.38): (5-7.14).

[0085] The present application has no specific limitation on the type of the 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.

[0086] The electrolyte conducts ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and one may be selected based on needs. For example, the electrolyte of this application may be any electrolyte suitable for electrochemical energy storage devices in the art. The electrolyte includes an electrolyte and a solvent. The electrolyte may typically include a lithium salt, and additives may also be added to the electrolyte.

[0087] Specifically, the lithium salt includes at least one of 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 difluorooxalatoborate (LiDFOB), lithium bis(oxalatoborate) (LiBOB), lithium difluorophosphate (LiPO2F2), lithium difluorobis(oxalatophosphate) (LiDFOP), and lithium tetrafluorooxalatophosphate (LiTFOP). The concentration of the electrolyte in the electrolyte solution may be 0.5 to 5 mol / L.

[0088] Specifically, the solvent includes at least one of ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), butylene 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), ethyl methyl sulfone (EMS) and diethyl sulfone (ESE).

[0089] In some embodiments, as examples, the additive may be conventional electrolyte additives such as fluoroethylene carbonate (FEC), chloroethylene carbonate (CEC), and vinylene carbonate (VC).

[0090] In some embodiments, the secondary battery further includes a separator. The present application has no particular limitation on the type of separator, and any known porous separator with good chemical and mechanical stability can be selected.

[0091] In some embodiments, as an example, the diaphragm can be one of PP, PE, and PP / PF; the diaphragm can also be a structure in which a coating is provided on the surface of the base film, wherein the base film coating can be one of PP, PE, and PP / PF, and the coating is an inorganic coating and / or an organic coating, the inorganic coating can be selected from alumina ceramic layer, beryl, etc., and the organic coating can be selected from PVDF, etc.

[0092] In the first embodiment, the electrical device includes a battery pack, which is the aforementioned battery pack. The first plate portion 31 of the heat exchange plate 30 of the aforementioned battery pack covers a portion of the bottom surface of the battery, while the second plate portion 32 is positioned on the first side surface of the battery 20. This allows the heat exchange plate 30 to dissipate heat from the battery 20, improving heat dissipation. Electrical devices incorporating the aforementioned battery pack also have the aforementioned advantages.

[0093] In the description of the present invention, it is to be understood that "plurality" refers to a quantity of two or more than two. The directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0094] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0095] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0096] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A battery pack, characterized in that: include: Bottom plate (10); A battery (20), the battery (20) being arranged above the base plate (10), the battery (20) having a battery bottom surface facing the base plate (10) and a first side surface connected to the battery bottom surface; a heat exchange plate (30), the heat exchange plate (30) comprising a first plate body (31) and a second plate body (32) connected to the first plate body (31), the first plate body (31) being arranged between the bottom surface of the battery and the bottom plate (10) and covering a portion of the bottom surface of the battery, and the second plate body (32) being arranged at a first side surface of the battery (20); An adhesive structure (40), wherein the area of ​​the battery bottom surface not covered by the first plate body (31) is connected to the bottom plate (10) via the adhesive structure (40).

2. The battery pack according to claim 1, wherein: The battery (20) further has a second side surface arranged opposite to the first side surface, the distance between the first side surface and the second side surface is a distance L, the dimension of the first plate portion (31) in the direction from the first side surface to the second side surface is a dimension a, wherein the ratio of the dimension a to the distance L satisfies: 0.05≤a / L≤0.

9.

3. The battery pack according to claim 1, wherein: The side of the first plate body (31) facing the bottom plate (10) is connected to the bottom plate (10) through the adhesive structure (40), the battery (20) further has a second side surface arranged opposite to the first side surface, the distance between the first side surface and the second side surface is a distance L, the dimension of the first plate body (31) in the direction from the first side surface to the second side surface is a dimension a, wherein the ratio of the dimension a to the distance L satisfies: 0.05≤a / L≤1.

2.

4. The battery pack according to any one of claims 1 to 3, characterized in that: The battery (20) further comprises a second side surface arranged opposite to the first side surface. There are a plurality of batteries (20), and each of the batteries (20) further comprises two end surfaces located between the first side surface and the second side surface. The plurality of batteries (20) are arranged along a first preset direction to form a battery column (50), and the end surfaces of two adjacent batteries (20) in the battery column (50) are arranged opposite to each other. All the batteries (20) in the battery column (50) share the same heat exchange plate (30).

5. The battery pack according to claim 4, characterized in that: An area of ​​the first side surface is greater than an area of ​​the end surface.

6. The battery pack according to claim 5, characterized in that: There are multiple heat exchange plates (30) and multiple battery columns (50), and the multiple heat exchange plates (30) are arranged in a one-to-one correspondence with the multiple battery columns (50). The multiple heat exchange plates (30) are arranged in sequence in a second preset direction perpendicular to the first preset direction.

7. The battery pack according to claim 4, characterized in that: A heat exchange plate (30) is arranged between two adjacent battery columns (50), and the two adjacent battery columns (50) include a first battery column and a second battery column. The battery (20) further has a second side surface arranged opposite to the first side surface. The first side surfaces of all the batteries (20) in the first battery column are arranged on the first side of the second plate body (32) located between the first battery column and the second battery column, and the second side surfaces of all the batteries (20) in the second battery column are arranged on the second side of the second plate body (32) located between the first battery column and the second battery column. The first side of the second plate body (32) and the second side of the second plate body (32) are arranged opposite to each other.

8. The battery pack according to claim 7, characterized in that: The heat exchange plate (30) further includes a third plate body (33), the second plate body (32) is connected between the first plate body (31) and the third plate body (33), and the third plate body (33) is in contact with the top surface of the battery (20).

9. The battery pack according to claim 1, wherein: The battery (20) further comprises a second side surface arranged opposite to the first side surface, the distance between the first side surface and the second side surface is a distance L, the dimension of the first plate body (31) in the direction from the first side surface to the second side surface is a dimension a, the battery further comprises an explosion-proof valve (60) arranged on the bottom surface of the battery, the first plate body (31) avoids the explosion-proof valve (60), the bonding structure (40) is provided with a avoidance portion for avoiding the explosion-proof valve (60), the ratio of the dimension a to the distance L satisfies: 0.05≤a / L≤0.45, and / or a heat exchange flow channel (36) is provided in the heat exchange plate (30).

10. The battery pack according to any one of claims 1 to 3, characterized in that: The battery pack further comprises a heat-conducting layer (70), which is arranged on the second plate portion (32) and located between the first side surface of the battery (20) and the second plate portion (32).

11. The battery pack according to claim 10, characterized in that: The battery pack further comprises a heat insulating pad (80), wherein the heat insulating pad (80) and the heat conducting layer (70) are respectively located on two opposite sides of the second plate portion (32).

12. The battery pack according to claim 8, wherein: The third plate portion (33) is in contact with the top surface of the battery (20) in the first battery column, and the heat exchange plate (30) located between the two battery columns (50) further includes: a fourth plate portion (34), the fourth plate portion (34) being connected to the second plate portion (32), the fourth plate portion (34) and the third plate portion (33) being respectively located on either side of the second plate portion (32), the fourth plate portion (34) being in contact with the top surface of the battery (20) in the second battery column; and / or, A fifth plate body (35), the fifth plate body (35) is connected to the second plate body (32), the fifth plate body (35) and the first plate body (31) are respectively located on both sides of the second plate body (32), and the fifth plate body (35) is in contact with the bottom surface of the battery in the second battery column.

13. 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 12.

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