Battery pack and electric device with same

Abstract

The utility model provides a kind of battery pack and the electric device with it, the battery pack includes: multiple batteries;Heat exchange plate is located between the side of two adjacent batteries, heat exchange plate includes the first plate body and the second plate body of split setting, first plate body has first heat exchange runner, second plate body has second heat exchange runner, and the one end of the middle part of first plate body towards battery and the one end of the middle part of second plate body towards battery have interval. Through the technical scheme provided in the present application, the problem that the space required by the battery when expanding is limited by the close assembly of the battery and the heat exchange plate in the related art, increasing the risk of abnormal explosion of the battery.

Description

Technical Field

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

[0002] Battery packs typically consist of multiple batteries arranged closely together to maximize space utilization and energy density. To ensure battery safety and performance, battery packs are usually equipped with heat exchange plates to manage battery temperature during operation.

[0003] In related technologies, the heat exchange plate is in direct contact with the side of the battery, forming a heat exchange interface, thereby effectively dissipating or absorbing heat and keeping the battery operating within a suitable temperature range.

[0004] However, during battery use, internal chemical reactions cause the battery to expand. Especially inside the battery pack, the assembly between the battery and the heat exchange plate is usually quite tight to ensure good thermal contact. This tight assembly restricts the space required for the battery to expand, preventing effective release of internal pressure and increasing the risk of abnormal battery explosion. In the event of an abnormal explosion, not only will other components of the battery pack be damaged, but it may also trigger fires and other safety hazards, posing a serious threat to equipment and users. Utility Model Content

[0005] This utility model provides a battery pack and an electrical device having the same, to solve the problem in related technologies where the tight assembly of the battery and the heat exchange plate restricts the space required for the battery to expand, increasing the risk of abnormal battery explosion.

[0006] According to one aspect of the present invention, a battery pack is provided, the battery pack comprising: a plurality of batteries; a heat exchange plate located between the sides of two adjacent batteries, the heat exchange plate comprising a first plate and a second plate separately disposed, the first plate having a first heat exchange channel, the second plate having a second heat exchange channel, and a gap between one end of the first plate facing the middle of the battery and one end of the second plate facing the middle of the battery.

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

[0008] By applying the technical solution of this utility model, and designing the heat exchange plate as a separate first plate and second plate with a gap between them, the problem in related technologies that the tight assembly of the battery and the heat exchange plate restricts the space required for battery expansion, increasing the risk of abnormal battery explosion is solved. Specifically, this design utilizes a liquid cooling medium flowing in the first and second heat exchange channels to remove the heat generated by the battery, while the gap provides the necessary space for battery expansion. Therefore, adopting the above structure can reduce or eliminate the risk of abnormal battery explosion due to insufficient expansion space while ensuring effective heat dissipation. Attached Figure Description

[0009] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

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

[0011] Figure 2 A side view of the battery pack provided in an embodiment of the present invention is shown;

[0012] Figure 3 This diagram shows a structural schematic of the battery pack provided in an embodiment of the present invention from another perspective;

[0013] Figure 4 This diagram shows a schematic representation of the heat exchange plate and heat-conducting component of the battery pack provided in an embodiment of the present invention.

[0014] Figure 5 A side view of the heat exchange plate and heat-conducting component of the battery pack provided in an embodiment of the present invention is shown;

[0015] Figure 6 A schematic diagram of the structure of the heat exchange plate of the battery pack provided in an embodiment of the present invention is shown;

[0016] Figure 7 A side view of the heat exchange plate of the battery pack provided in an embodiment of the present invention is shown;

[0017] Figure 8 A schematic diagram of the structure of the heat-conducting component of the battery pack provided in an embodiment of the present invention is shown;

[0018] Figure 9 A side view of the heat-conducting component of the battery pack provided in an embodiment of the present invention is shown.

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

[0020] 10. Battery; 11. First side; 12. Second side; 13. Terminal post; 14. Explosion-proof valve;

[0021] 20. Heat exchange plate; 21. First plate body; 211. First heat exchange channel; 212. First connecting piece; 2121. First clearance groove; 22. Second plate body; 221. Second heat exchange channel; 222. Second connecting piece; 2221. Second clearance groove; 223. Protrusion;

[0022] 30. Interval;

[0023] 40. Thermal conductive component; 41. Thermal conductive sheet; 42. Thermal conductive strip;

[0024] 50. Battery array;

[0025] L is the dimension between the first plate and the second plate in the arrangement direction.

[0026] H, the dimensions of the battery in the arrangement direction of the first and second plates;

[0027] h1, the dimension of the first plate in the direction of the arrangement of the first plate and the second plate;

[0028] h2, the dimension of the second plate in the direction of the arrangement of the first plate and the second plate. Detailed Implementation

[0029] 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.

[0030] like Figures 1 to 9 As shown, this utility model embodiment provides a battery pack, which includes a plurality of batteries 10 and a heat exchange plate 20. The heat exchange plate 20 is located between the sides of two adjacent batteries 10. The heat exchange plate 20 includes a first plate 21 and a second plate 22 that are separately arranged. The first plate 21 has a first heat exchange channel 211, and the second plate 22 has a second heat exchange channel 221. There is a gap 30 between the end of the first plate 21 facing the middle of the battery 10 and the end of the second plate 22 facing the middle of the battery 10.

[0031] By applying the battery pack provided in this embodiment, and designing the heat exchange plate 20 as a separate first plate 21 and second plate 22 with a gap 30 between them, the problem in related technologies where the tight assembly of the battery and the heat exchange plate restricts the space required for battery expansion, increasing the risk of abnormal battery explosion is solved. Specifically, this design utilizes a liquid cooling medium flowing in the first heat exchange channel 211 and the second heat exchange channel 221 to remove the heat generated by the battery 10, while the gap 30 provides the necessary space for the expansion of the battery 10. Therefore, the above structure can reduce or eliminate the risk of abnormal battery explosion due to insufficient expansion space while ensuring effective heat dissipation.

[0032] It should be noted that, in this application, the middle part of the battery refers to the middle area of ​​the battery in the arrangement direction of the first plate 21 and the second plate 22.

[0033] In this embodiment, the interval 30 is positioned directly opposite the center of the battery 10. By placing the interval 30 in the center of the battery 10, which is the location where battery expansion is most significant, the layout of the battery expansion space is further optimized.

[0034] Specifically, considering that the expansion of the middle part of the battery 10 is usually higher than that of the two ends during the charging and discharging process, this design can more effectively adapt to the expansion characteristics of the battery, reduce the impact of battery deformation on the overall structure, and can specifically increase the expansion space in the middle of the battery, reducing the risk of abnormal battery explosion, while maintaining good heat exchange performance.

[0035] like Figure 2 and Figure 7 As shown, in the arrangement direction of the first plate 21 and the second plate 22, the dimension of the interval 30 is L mm, and the dimension of the battery 10 is H mm, with 0.02 ≤ L / H ≤ 0.25. By precisely controlling the ratio of the dimension L of the interval 30 to the dimension H of the battery 10, the heat dissipation requirements and the battery expansion space requirements are balanced.

[0036] The L / H ratio directly affects the heat exchange efficiency inside the battery pack and the safety when the battery expands. By precisely controlling the ratio of the size L of the 30-meter interval to the size H of the battery 10, sufficient heat dissipation channels can be ensured within a limited space, while also reserving appropriate expansion space for the battery 10 to prevent safety hazards caused by overheating and expansion.

[0037] Wherein, L / H can be 0.02, 0.04, 0.06, 0.08, 0.10, 0.12, 0.14, 0.16, 0.18, 0.20, 0.22, 0.24, 0.25, and other values ​​between 0.02 and 0.25.

[0038] In this embodiment, the dimension of the interval 30 in the arrangement direction of the first plate 21 and the second plate 22 is L mm, where 5 mm ≤ L mm ≤ 20 mm. By setting the range of the dimension L of the interval 30, the rationality of the internal structure of the battery pack and the heat exchange efficiency are ensured. By setting the dimension L of the interval 30 within the above range, sufficient expansion space can be provided for the battery 10 without sacrificing too much heat dissipation performance, effectively preventing abnormal battery explosion.

[0039] Where L can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, or other values ​​between 5mm and 20mm.

[0040] like Figure 7 As shown, in the arrangement direction of the first plate 21 and the second plate 22, the size of the first plate 21 is h1 mm, and the size of the second plate 22 is h2 mm, where 0.8 mm ≤ h1 - h2 ≤ 1.2 mm. By adjusting the size difference between the first plate 21 and the second plate 22, the structural layout of the heat exchange plate 20 is optimized.

[0041] The difference between h1 and h2 affects the heat exchange efficiency of the heat exchange plate 20 and the expansion space of the battery 10. Setting h1-h2 within the above range can provide additional expansion space for the battery 10 while maintaining the heat exchange efficiency of the heat exchange plate 20, thereby reducing the risk of abnormal battery explosion.

[0042] Specifically, h1-h2 can be 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, and other values ​​between 0.8mm and 1.2mm.

[0043] like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 8 as well as Figure 9 As shown, a heat-conducting component 40 is provided between the first plate 21 and the side of the battery 10 and / or between the second plate 22 and the side of the battery 10. By adding the heat-conducting component 40 between the battery 10 and the first plate 21 and / or the second plate 22, the heat conduction between the battery and the heat exchange plate is enhanced, thereby accelerating heat transfer and significantly improving the heat dissipation efficiency of the battery pack, while maintaining the assembly stability of the battery and the heat exchange plate.

[0044] In this embodiment, the heat-conducting component 40 fills the gap 30, which can further improve the heat conduction effect and strengthen the connection strength between the first plate 21 and the second plate 22, thereby improving the assembly stability of the heat exchange plate.

[0045] Specifically, the filling of the heat-conducting component 40 can compensate for the heat conduction loss caused by the gap 30, while also enhancing the connection strength between the first plate 21 and the second plate 22. Therefore, the above structure not only improves the heat dissipation performance of the battery pack, but also enhances the structural stability of the heat exchange plate 20, reducing the risk of abnormal battery explosion.

[0046] like Figure 8 and Figure 9 As shown, the heat-conducting component 40 includes a heat-conducting sheet 41 and a heat-conducting strip 42. One end of the heat-conducting sheet 41 is connected to the heat-conducting strip 42. The heat-conducting sheet 41 is disposed between the first plate 21 and the side of the battery 10 and / or between the second plate 22 and the side of the battery 10. The heat-conducting strip 42 fills the gap 30. By adopting the combination of the heat-conducting sheet 41 and the heat-conducting strip 42, the design of the heat-conducting component 40 is optimized. The heat-conducting sheet 41 can increase the contact area between the battery 10 and the heat exchange plate 20, while the heat-conducting strip 42 can effectively fill the gap 30, ensuring the continuity of the heat conduction path. Therefore, the above structure can significantly improve the heat dissipation efficiency of the battery pack, while enhancing the structural stability of the heat exchange plate 20.

[0047] In this embodiment, the heat-conducting component 40 includes four heat-conducting sheets 41, two of which cover both sides of the first plate 21 in the thickness direction, and the other two heat-conducting sheets 41 cover both sides of the second plate 22 in the thickness direction. By covering both sides of the first plate 21 and the second plate 22 with two heat-conducting sheets 41 respectively, the layout of the heat-conducting component 40 is further optimized. This design increases the contact area between the battery 10 and the heat exchange plate 20, improves the heat conduction efficiency, significantly enhances the heat dissipation performance of the battery pack, and maintains the structural stability of the heat exchange plate 20 and the assembly stability of the battery pack.

[0048] In this embodiment, the heat-conducting component 40 includes a silicone component. By using a silicone component as the heat-conducting component 40, the silicone component has good thermal conductivity and flexibility, which can accommodate the expansion of the battery 10 while maintaining good contact with the heat exchange plate 20. Therefore, the above structure can significantly improve the heat dissipation efficiency of the battery pack, while reducing the impact of battery expansion on the overall structure of the battery pack.

[0049] The thickness of the first plate 21 gradually decreases in the direction in which the first plate 21 and the second plate 22 approach each other; and / or, the thickness of the second plate 22 gradually decreases in the direction in which the first plate 21 and the second plate 22 approach each other. By designing the thickness of the first plate 21 and / or the second plate 22 to gradually change, the structure of the heat exchange plate 20 is further optimized. This design can better accommodate the expansion of the battery 10 while maintaining the structural strength of the heat exchange plate 20.

[0050] By adopting the above structure, more expansion space can be provided for the battery 10 without sacrificing too much heat dissipation performance, thus reducing the risk of abnormal battery explosion.

[0051] In this embodiment, the thickness of the first plate 21 gradually decreases in the direction in which the first plate 21 and the second plate 22 approach each other, and the thickness of the second plate 22 gradually decreases in the direction in which the first plate 21 and the second plate 22 approach each other.

[0052] like Figure 1 As shown, the first plate 21 has multiple first heat exchange channels 211, which are spaced 30 apart in the arrangement direction of the first plate 21 and the second plate 22. By providing multiple first heat exchange channels 211 in the first plate 21 and cooperating with the spacing 30 in the arrangement direction, the heat exchange structure of the heat exchange plate 20 is optimized. The multiple first heat exchange channels 211 can increase the flow path of the cooling medium and improve the heat exchange efficiency, thereby significantly improving the heat dissipation performance of the battery pack while maintaining the expansion space of the battery 10.

[0053] In this embodiment, the flow areas of the multiple first heat exchange channels 211 are all the same. By keeping the flow areas of the multiple first heat exchange channels 211 consistent, the heat exchange uniformity of the heat exchange plate 20 is optimized. Heat exchange channels with the same flow area can ensure that the flow rate and volume of the cooling medium are basically the same in all channels, thereby achieving uniform heat dissipation, which can significantly improve the thermal management efficiency of the battery pack and avoid local overheating.

[0054] like Figure 1 As shown, the second plate 22 has multiple second heat exchange channels 221, which are spaced 30 apart in the arrangement direction of the first plate 21 and the second plate 22. By providing multiple second heat exchange channels 221 in the second plate 22 and cooperating with the spacing 30 in the arrangement direction, the heat exchange structure of the heat exchange plate 20 is further optimized.

[0055] The second heat exchange channel 221 and the first heat exchange channel 211 together form the heat exchange network of the heat exchange plate 20, which improves the heat exchange efficiency, significantly enhances the heat dissipation performance of the battery pack, and maintains the expansion space of the battery 10.

[0056] In this embodiment, the flow areas of the multiple second heat exchange channels 221 are all the same. By keeping the flow areas of the multiple second heat exchange channels 221 consistent, the heat exchange uniformity of the heat exchange plate 20 is optimized. Heat exchange channels with the same flow area can ensure that the flow rate and volume of the cooling medium are basically the same in all channels, thereby achieving uniform heat dissipation, which can significantly improve the thermal management efficiency of the battery pack and avoid local overheating.

[0057] like Figure 1 As shown, the battery 10 has a first side 11 and a second side 12. The area of ​​the first side 11 is larger than the area of ​​the second side 12. The heat exchange plate 20 is located between the first sides 11 of two adjacent batteries 10.

[0058] By placing the heat exchange plate 20 between the first side 11 of the battery 10, the heat exchange efficiency of the battery pack is optimized.

[0059] Specifically, the first side 11 has a larger area, which can provide a larger heat exchange interface, which is conducive to the rapid dissipation of heat and thus can significantly improve the heat dissipation performance of the battery pack, while maintaining the expansion space of the battery 10.

[0060] like Figure 1 As shown, in this embodiment, the battery pack includes multiple battery rows 50, each battery row 50 including multiple batteries 10, and a heat exchange plate 20 is located between two adjacent battery rows 50. By setting the heat exchange plate 20 between the multiple battery rows 50, the overall heat exchange structure of the battery pack is optimized. The heat exchange plate 20 can simultaneously provide heat dissipation for multiple battery rows 50, improving heat exchange efficiency and significantly enhancing the heat dissipation performance of the battery pack, while maintaining the expansion space of the batteries 10.

[0061] like Figures 1 to 7 As shown, in this embodiment, a first connecting piece 212 is provided at the end of the first plate 21 away from the second plate 22, and the first connecting piece 212 is matched with the shoulder of the first end of the battery 10. By providing the first connecting piece 212 on the first plate 21, the connection method between the first plate 21 and the battery 10 is optimized, and the assembly firmness of the first plate 21 is improved.

[0062] In this embodiment, a terminal post 13 is provided at the first end of the battery 10, and the first connecting piece 212 has a first clearance groove 2121 to avoid the terminal post 13. By providing the first clearance groove 2121 on the first connecting piece 212, the terminal post 13 of the battery 10 is avoided, thus optimizing the electrical connection and thermal management layout of the battery pack. The first clearance groove 2121 can ensure that the terminal post 13 of the battery 10 is not disturbed, while maintaining good contact between the first connecting piece 212 and the battery 10, thereby achieving efficient heat dissipation of the battery pack and compatibility of electrical connections, and avoiding interference between electrical connections and thermal management layout.

[0063] like Figures 1 to 7 As shown, a second connecting piece 222 is provided at the end of the second plate 22 away from the first plate 21. The second connecting piece 222 is matched with the shoulder of the second end of the battery 10. By providing the second connecting piece 222 on the second plate 22, the connection method between the second connecting piece 222 and the battery 10 is optimized, and the assembly firmness of the second connecting piece 222 is improved.

[0064] In this embodiment, an explosion-proof valve 14 is provided at the second end of the battery 10, and the second connecting piece 222 has a second clearance groove 2221 to avoid the explosion-proof valve 14. By providing the second clearance groove 2221 on the second connecting piece 222, the explosion-proof valve 14 of the battery 10 is avoided, thus optimizing the safety and thermal management layout of the battery pack.

[0065] Specifically, the second clearance groove 2221 can ensure that the explosion-proof valve 14 of the battery 10 can work normally when necessary, while maintaining good contact between the second connecting piece 222 and the battery 10, thus achieving efficient heat dissipation of the battery pack and compatibility of safety performance.

[0066] like Figure 1 As shown, a protrusion 223 is provided at the end of the second connecting piece 222 away from the first plate 21, and the protrusion 223 has a second heat exchange channel 221. By providing a protrusion 223 at the far end of the second connecting piece 222 and providing a second heat exchange channel 221 in the protrusion 223, the heat exchange structure of the heat exchange plate 20 is optimized, and the second heat exchange channel 221 can improve the heat exchange efficiency. Furthermore, the protrusion 223 can also strengthen the structural strength of the second connecting piece 222.

[0067] It should be noted that the heat exchange plate 20 in this embodiment can be a water-cooled plate.

[0068] Another embodiment of the present invention provides an electrical device, which includes a battery pack, the battery pack being the one provided above.

[0069] Therefore, this electrical device also solves the problem in related technologies where the tight assembly of the battery and the heat exchange plate restricts the space required for the battery to expand, increasing the risk of abnormal battery explosion, by designing the heat exchange plate 20 as a separate first plate 21 and a second plate 22 with a gap 30 between them.

[0070] Electrical devices include, but are not limited to, vehicles.

[0071] The apparatus provided by the embodiments mainly has the following beneficial effects:

[0072] (1) By setting a gap 30 between the first plate 21 and the second plate 22 at one end facing the middle of the battery 10, the necessary space is provided for the expansion of the battery during charging and discharging, thereby avoiding excessive internal pressure caused by the expansion of the battery and reducing or eliminating the risk of abnormal battery explosion.

[0073] (2) The split design of the heat exchange plate 20 and the included first heat exchange channel 211 and second heat exchange channel 221 can effectively improve the heat dissipation performance of the battery pack, ensure that the battery operating temperature is within a safe range, and extend the battery life.

[0074] (3) A heat-conducting component 40 is provided between the first plate 21 and the side of the battery 10 and / or between the second plate 22 and the side of the battery 10. In particular, a combination of heat-conducting sheet 41 and heat-conducting strip 42 can significantly improve the heat transfer efficiency between the battery and the heat exchange plate, so that the coolant can uniformly remove the heat generated during battery operation. In addition, the heat-conducting component 40 not only enhances heat transfer, but also enhances the structural stability and assembly tightness of the entire battery pack.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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).

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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).

[0087] This application does not specifically limit the type of negative electrode current collector. In some embodiments, as an example, the negative electrode current collector can be one of the conventional negative electrode current collectors such as copper foil.

[0088] 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.

[0089] 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.

[0090] 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).

[0091] 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).

[0092] 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.

[0093] 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.

[0094] 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.

[0095] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0096] 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.

[0097] 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.

[0098] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model.

[0099] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, The battery pack includes: Multiple batteries (10); A heat exchange plate (20) is located between the sides of two adjacent batteries (10). The heat exchange plate (20) includes a first plate (21) and a second plate (22) that are separately arranged. The first plate (21) has a first heat exchange channel (211), and the second plate (22) has a second heat exchange channel (221). There is a gap (30) between the end of the first plate (21) facing the middle of the battery (10) and the end of the second plate (22) facing the middle of the battery (10).

2. The battery pack according to claim 1, characterized in that, The interval (30) is positioned directly opposite the center of the battery (10).

3. The battery pack according to claim 1, characterized in that, In the arrangement direction of the first plate (21) and the second plate (22), the size of the interval (30) is L in mm, and the size of the battery (10) is H in mm, 0.02≤L / H≤0.

25.

4. The battery pack according to claim 1, characterized in that, In the arrangement direction of the first plate (21) and the second plate (22), the size of the interval (30) is L, in mm, where 5mm≤L≤20mm.

5. The battery pack according to claim 1, characterized in that, In the arrangement direction of the first plate (21) and the second plate (22), the size of the first plate (21) is h1 in mm, and the size of the second plate (22) is h2 in mm, 0.8mm≤h1-h2≤1.2mm.

6. The battery pack according to claim 1, characterized in that, A heat-conducting element (40) is provided between the first plate (21) and the side of the battery (10) and / or between the second plate (22) and the side of the battery (10).

7. The battery pack according to claim 6, characterized in that, The heat-conducting element (40) fills the gap (30).

8. The battery pack according to claim 6, characterized in that, The heat-conducting component (40) includes a heat-conducting sheet (41) and a heat-conducting strip (42). One end of the heat-conducting sheet (41) is connected to the heat-conducting strip (42). The heat-conducting sheet (41) is disposed between the first plate (21) and the side of the battery (10) and / or between the second plate (22) and the side of the battery (10). The heat-conducting strip (42) fills the gap (30).

9. The battery pack according to claim 8, characterized in that, The heat-conducting component (40) includes four heat-conducting sheets (41), two of which are wrapped around the first plate (21) on both sides in the thickness direction, and the other two are wrapped around the second plate (22) on both sides in the thickness direction.

10. The battery pack according to claim 6, characterized in that, The thermal conductive component (40) includes a silicone component.

11. The battery pack according to any one of claims 1 to 10, characterized in that, The thickness of the first plate (21) gradually decreases in the direction in which the first plate (21) and the second plate (22) approach each other; and / or, The thickness of the second plate (22) gradually decreases in the direction in which the first plate (21) and the second plate (22) approach each other.

12. The battery pack according to any one of claims 1 to 10, characterized in that, The first plate (21) has a plurality of first heat exchange channels (211), which are spaced (30) apart in the arrangement direction of the first plate (21) and the second plate (22).

13. The battery pack according to claim 12, characterized in that, The flow area of ​​all of the first heat exchange channels (211) is the same.

14. The battery pack according to any one of claims 1 to 10, characterized in that, The second plate (22) has a plurality of second heat exchange channels (221), which are spaced (30) apart in the arrangement direction of the first plate (21) and the second plate (22).

15. The battery pack according to claim 14, characterized in that, The flow area of ​​the multiple second heat exchange channels (221) is the same.

16. The battery pack according to any one of claims 1 to 10, characterized in that, The battery (10) has a first side (11) and a second side (12), the area of ​​the first side (11) is larger than the area of ​​the second side (12), and the heat exchange plate (20) is located between the first side (11) of two adjacent batteries (10).

17. The battery pack according to any one of claims 1 to 10, characterized in that, The battery pack includes multiple battery rows (50), each battery row (50) includes multiple batteries (10), and the heat exchange plate (20) is located between two adjacent battery rows (50).

18. The battery pack according to any one of claims 1 to 10, characterized in that, A first connecting piece (212) is provided at one end of the first plate (21) away from the second plate (22), and the first connecting piece (212) is engaged with the shoulder of the first end of the battery (10).

19. The battery pack according to claim 18, characterized in that, The battery (10) has a terminal post (13) at its first end, and the first connecting piece (212) has a first clearance groove (2121) that avoids the terminal post (13).

20. The battery pack according to any one of claims 1 to 10, characterized in that, A second connecting piece (222) is provided at one end of the second plate (22) away from the first plate (21), and the second connecting piece (222) is engaged with the shoulder of the second end of the battery (10).

21. The battery pack according to claim 20, characterized in that, The second end of the battery (10) is provided with an explosion-proof valve (14), and the second connecting piece (222) has a second clearance groove (2221) to avoid the explosion-proof valve (14).

22. The battery pack according to claim 20, characterized in that, The second connecting piece (222) has a protrusion (223) at one end away from the first plate (21), and the protrusion (223) has the second heat exchange channel (221).

23. An electrical appliance, characterized in that, The electrical device includes a battery pack, which is the battery pack according to any one of claims 1 to 22.

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