Heat exchange plate, battery pack, and electric device

Abstract

The utility model relates to battery technical field provides a kind of heat exchange plate, battery pack and electric device, the heat exchange plate includes: heat exchange plate base body, with heat exchange runner and with heat exchange runner intercommunication's water gap;Current collector, including base body and assembly part, assembly part is set on base body, assembly part is connected with heat exchange plate base body, base body is provided with box body connection flanging;Wherein, assembly part is provided with current collection cavity, current collection cavity is correspondingly set with water gap, base body is provided with first heat exchange runner, assembly part is provided with second heat exchange runner, first heat exchange runner and the first end of second heat exchange runner are interconnected, current collection cavity and the second end of second heat exchange runner are interconnected, and first heat exchange runner and second heat exchange runner are arranged at angle. Through the technical scheme provided in the present application, the problem of poor assembly stability of the current collector in the related art can be solved.

Description

Technical Field

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

[0002] The battery pack is equipped with a liquid cooling plate. The coolant inside the plate flows to remove excess heat generated during the charging and discharging of the cells and provides reverse heating in low-temperature environments, keeping the battery operating within its optimal temperature range. This prevents overheating degradation and low-temperature power loss, ensuring range, power, and safety.

[0003] The design of the liquid cooling plate directly affects the thermal management efficiency and overall performance of the battery pack. Traditional liquid cooling plates mainly consist of one or more heat exchange channels and inlets for liquid inlet and outlet, while the current collector is responsible for guiding the external heat exchange medium to the inlets of the liquid cooling plate to achieve effective circulation of the heat exchange medium.

[0004] In related technologies, the current collector is connected to the liquid cooling plate to fix the current collector on the liquid cooling plate. However, with the above structure, the current collector suffers from poor assembly stability. Utility Model Content

[0005] This invention provides a heat exchange plate, a battery pack, and an electrical device to solve the problem of poor assembly stability of current collectors in related technologies.

[0006] According to one aspect of the present invention, a heat exchange plate is provided, comprising: a heat exchange plate substrate having a heat exchange channel and a water inlet communicating with the heat exchange channel; a collector comprising a substrate and an assembly part, the assembly part being disposed on the substrate and connected to the heat exchange plate substrate, the substrate being provided with a box-connecting flange; wherein, the assembly part is provided with a collector cavity, the collector cavity being correspondingly disposed with the water inlet, the substrate being provided with a first heat exchange channel, the assembly part being provided with a second heat exchange channel, the first heat exchange channel and the second heat exchange channel being connected at a first end, the collector cavity being connected to the second end of the second heat exchange channel, and the first heat exchange channel and the second heat exchange channel being disposed at an angle.

[0007] According to another aspect of the present invention, a battery pack is provided, the battery pack including a heat exchange plate, the heat exchange plate being the heat exchange plate provided above.

[0008] According to another aspect of the present invention, an electrical device is provided, the electrical device including a battery pack, the battery pack being the battery pack provided above.

[0009] The technical solution of this utility model can solve the problem of poor assembly stability of the current collector in related technologies. First, the assembly part is connected to the heat exchange plate base, realizing the connection between the current collector and the heat exchange plate base, thus achieving a first-level fixation of the current collector. Second, the base is provided with a box-connecting flange, through which the current collector is connected to the battery pack box, achieving a second-level fixation of the current collector. In other words, the current collector is assembled using a double-fixation structure, which can improve the assembly stability. Furthermore, since the first heat exchange channel and the second heat exchange channel are set at an angle, the flow path of the fluid inside the heat exchange plate is optimized, improving the fluid flow efficiency and heat exchange efficiency, and facilitating the connection of the current collector with the heat exchange plate base and the water source. Attached Figure Description

[0010] 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:

[0011] Figure 1 A schematic diagram of the structure of the heat exchange plate provided in an embodiment of the present invention is shown;

[0012] Figure 2 A bottom view of the heat exchange plate (current collector perspective) provided in an embodiment of the present invention is shown;

[0013] Figure 3 It shows Figure 2 A magnified view of a section at point S in the middle;

[0014] Figure 4 This diagram shows a structural schematic of the heat exchange plate provided in an embodiment of the present invention from another perspective;

[0015] Figure 5 This diagram shows a schematic representation of the current collector structure of the heat exchange plate provided in an embodiment of the present invention.

[0016] Figure 6 This shows a structural schematic diagram of the heat exchange plate current collector from another perspective provided in an embodiment of the present invention;

[0017] Figure 7 This is a schematic diagram of the current collector of the heat exchange plate provided in an embodiment of the present invention from another perspective;

[0018] Figure 8 A front view of the current collector of the heat exchange plate provided in an embodiment of the present invention is shown;

[0019] Figure 9 A side view of the current collector of the heat exchange plate provided in an embodiment of the present invention is shown.

[0020] The above figures include the following reference numerals:

[0021] 10. Heat exchange plate substrate; 11. Heat exchange channel; 12. Water inlet; 121. Water inlet; 122. Water outlet;

[0022] 20. Current collector; 21. Matrix; 211. Box connecting flange; 212. First heat exchange channel; 22. Assembly part; 221. Current collection cavity; 2211. First current collection cavity; 2212. Second current collection cavity; 222. Second heat exchange channel; 223. First connecting column; 224. Second connecting column; 225. Connecting base; 23. Partition wall;

[0023] 41. Positioning post;

[0024] C. The thickness of the partition wall;

[0025] L1, the dimension of the first interval;

[0026] L2, the size of the second interval. Detailed Implementation

[0027] 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.

[0028] like Figures 1 to 6 As shown, this embodiment of the present invention provides a heat exchange plate, which includes a heat exchange plate base 10 and a collector 20. The heat exchange plate base 10 has a heat exchange channel 11 and a water inlet 12 connected to the heat exchange channel 11. The collector 20 includes a base 21 and an assembly part 22. The assembly part 22 is disposed on the base 21 and connected to the heat exchange plate base 10. The base 21 is provided with a box-connecting flange 211. The assembly part 22 is provided with a collecting cavity 221, which is correspondingly disposed to the water inlet 12. The base 21 is provided with a first heat exchange channel 212, and the assembly part 22 is provided with a second heat exchange channel 222. The first heat exchange channel 212 is connected to the first end of the second heat exchange channel 222, and the collecting cavity 221 is connected to the second end of the second heat exchange channel 222. The first heat exchange channel 212 and the second heat exchange channel 222 are disposed at an angle.

[0029] The heat exchange plate provided in this embodiment can solve the problem of poor assembly stability of the current collector in related technologies. First, the assembly part 22 is connected to the heat exchange plate base 10, realizing the connection between the current collector 20 and the heat exchange plate base 10, thus achieving a first-level fixation of the current collector 20. Second, the base 21 is provided with a box-connecting flange 211, through which the current collector 20 is connected to the box of the battery pack, thus achieving a second-level fixation of the current collector 20. In other words, the current collector 20 is assembled using a double-fixation structure, which can improve the assembly stability. Furthermore, since the first heat exchange channel 212 and the second heat exchange channel 222 are set at an angle, the flow path of the fluid (heat exchange medium) inside the heat exchange plate is optimized, improving the fluid flow efficiency and heat exchange efficiency, and facilitating the connection of the current collector 20 with the heat exchange plate base 10 and the water source.

[0030] like Figure 3 As shown, the water inlet 12 includes an inlet 121 and an outlet 122. The collecting cavity 221 includes a first collecting cavity 2211 and a second collecting cavity 2212. The first collecting cavity 2211 is correspondingly arranged to the inlet 121, and the second collecting cavity 2212 is correspondingly arranged to the outlet 122. The substrate 21 is provided with two first heat exchange channels 212 and two second heat exchange channels 222. The two first heat exchange channels 212 are respectively connected to the first ends of the two second heat exchange channels 222. The second end of the first second heat exchange channel 222 is connected to the first collecting cavity 2211, and the second end of the second second heat exchange channel 222 is connected to the second collecting cavity 2212. The two first heat exchange channels 212 are respectively arranged at an angle to the two second heat exchange channels 222. By setting up inlet 121 and outlet 122, as well as corresponding first and second flow collection chambers 2211 and 2212, smooth flow of fluid is ensured. At the same time, the setting of two first heat exchange channels 212 and two second heat exchange channels 222 can more effectively distribute and collect fluid, thereby improving heat exchange efficiency.

[0031] In this embodiment, the two first heat exchange channels 212 extend in parallel directions. By making the two first heat exchange channels 212 extend in parallel directions, the flow path of the fluid inside the heat exchange plate is optimized, ensuring uniform fluid distribution.

[0032] In this embodiment, the two second heat exchange channels 222 extend in parallel directions. By making the two second heat exchange channels 222 extend in parallel directions, the flow path of the fluid inside the heat exchange plate is optimized, ensuring uniform fluid distribution.

[0033] Specifically, the parallel arrangement of the two first heat exchange channels 212 and the two second heat exchange channels 222 ensures that the fluid flows in the same direction before entering the heat exchange channel 11, thus improving the fluid flow efficiency. At the same time, the parallel arrangement also simplifies the manufacturing process of the heat exchange plate and reduces production costs.

[0034] In this embodiment, the inlet 121 and outlet 122 are arranged in the front-to-back direction, and the first collection cavity 2211 and the second collection cavity 2212 are also arranged in the front-to-back direction. By arranging the inlet 121 and outlet 122, as well as the first collection cavity 2211 and the second collection cavity 2212, in the front-to-back direction, the structural layout of the heat exchange plate is optimized, and the space utilization rate is improved.

[0035] Furthermore, the front-to-back arrangement not only simplifies the manufacturing process of the heat exchange plate and reduces production costs, but also facilitates the connection between the heat exchange plate and external pipes, improving the ease of installation.

[0036] In this embodiment, the inlet 121 is located inside the outlet 122. By placing the inlet 121 inside the outlet 122, the distance of the heat exchange medium from the inlet 121 to the heat exchange channel 11 is shortened, thereby accelerating the response speed of the heat exchange medium and improving the heat exchange efficiency.

[0037] like Figure 5 and Figure 6 As shown, a partition wall 23 is provided between the first collector cavity 2211 and the second collector cavity 2212. The thickness of the partition wall 23 is C mm, where 4 mm ≤ C mm ≤ 12 mm. By providing a partition wall 23 between the first collector cavity 2211 and the second collector cavity 2212 and controlling the thickness C of the partition wall 23, the structure of the collector is optimized. The partition wall 23 can be used to separate the first collector cavity 2211 and the second collector cavity 2212, ensuring that the heat exchange media in the first collector cavity 2211 and the second collector cavity 2212 do not affect each other.

[0038] The thickness C of the partition wall 23 can be 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, or other values ​​between 4mm and 12mm.

[0039] Among them, there are at least two inlets 121, which are arranged in the left-right direction; the first collecting cavity 2211 is a long strip structure and is covered above the at least two inlets 121; and / or, there are at least two outlets 122, which are arranged in the left-right direction; the second collecting cavity 2212 is a long strip structure and is covered above the at least two outlets 122; and / or, the length of the second collecting cavity 2212 is greater than the length of the first collecting cavity 2211.

[0040] In this embodiment, there are at least two water inlets 121, which are arranged in a left-right direction. There are at least two water outlets 122, and both the at least two water inlets 121 and the at least two water outlets 122 are arranged in a left-right direction.

[0041] On the one hand, at least two water inlets 121 are arranged in the left-right direction, realizing multi-point uniform input of the heat exchange medium, improving the cooling efficiency of the heat exchange plate and the temperature uniformity of the battery pack. The multi-point water inlet design can reduce the flow resistance of the heat exchange medium inside the heat exchange plate, thereby improving the heat exchange effect and effectively reducing the risk of local overheating of the battery pack.

[0042] On the other hand, at least two outlets 122 are arranged in the left-right direction, realizing multi-point uniform discharge of the heat exchange medium, improving the cooling efficiency of the heat exchange plate and the temperature uniformity of the battery pack. The multi-point outlet design can reduce the flow resistance of the heat exchange medium inside the heat exchange plate, thereby improving the heat exchange effect and effectively reducing the risk of local overheating of the battery pack.

[0043] In this embodiment, both the first collecting cavity 2211 and the second collecting cavity 2212 are elongated structures. The first collecting cavity 2211 covers at least two inlets 121, and the second collecting cavity 2212 covers at least two outlets 122. By designing the first collecting cavity 2211 and the second collecting cavity 2212 as elongated structures and covering the inlets 121 and outlets 122 respectively, the flow path of the fluid inside the heat exchange plate is optimized, ensuring uniform distribution and collection of the fluid.

[0044] Furthermore, this structural design not only improves the heat exchange efficiency of the heat exchange plate, but also simplifies the manufacturing process of the heat exchange plate and reduces production costs.

[0045] Specifically, the length of the second manifold 2212 is greater than the length of the first manifold 2211. By designing the length of the second manifold 2212 to be greater than the length of the first manifold 2211, the longer second manifold 2212 can ensure that the fluid leaves the heat exchange channel 11 quickly, reduce fluid loss at the bend, and improve the fluid flow efficiency.

[0046] In this embodiment, the collector 20 further includes two connecting pipes, which are respectively inserted into the two first heat exchange channels 212. By providing two connecting pipes on the collector 20 and inserting them into the two first heat exchange channels 212, the connection method between the heat exchange plate and the external pipe is optimized, and the stability and sealing of the connection are improved.

[0047] In other words, this connection method not only simplifies the installation process of the heat exchange plate but also reduces the installation difficulty.

[0048] In this embodiment, the included angle between the first heat exchange channel 212 and the second heat exchange channel 222 is X°, where 75°≤X°≤105°. By setting the included angle between the first heat exchange channel 212 and the second heat exchange channel 222 to X°, the flow path of the fluid inside the heat exchange plate is optimized, thereby improving the fluid flow efficiency and heat exchange efficiency.

[0049] The included angle X between the first heat exchange channel 212 and the second heat exchange channel 222 can be 75°, 80°, 85°, 90°, 95°, 100°, 105°, or other values ​​between 75° and 105°.

[0050] In this embodiment, the aperture of the first heat exchange channel 212 is larger than the aperture of the second heat exchange channel 222. By designing the aperture of the first heat exchange channel 212 to be larger than that of the second heat exchange channel 222, the flow velocity of the fluid in the second heat exchange channel 222 can be increased, thereby improving the fluid flow efficiency.

[0051] like Figures 7 to 9 As shown, the base 21 protrudes forward from the mounting part 22, which facilitates the assembly of the base 21 with other components, such as the assembly of the base 21 with the connecting pipe.

[0052] In this embodiment, the assembly part 22 includes a first connecting post 223, a second connecting post 224, and a connecting base 225. One end of the first connecting post 223 is connected to the base 21, and the other end of the first connecting post 223 is connected to the connecting base 225. One end of the second connecting post 224 is connected to the base 21, and the other end of the second connecting post 224 is connected to the connecting base 225. A first second heat exchange channel 222 passes through the first connecting post 223, and a second second heat exchange channel 222 passes through the second connecting post 224. The first collection cavity 2211 and the second collection cavity 2212 are both disposed on the connecting base 225. With the above structure, since the two second heat exchange channels 222 are respectively disposed on the two independent components of the first connecting post 223 and the second connecting post 224, the influence of heat exchange between the fluids inside the two second heat exchange channels 222 can be reduced.

[0053] Specifically, the first connecting post 223 and the second connecting post 224 have a first gap in the left-right direction, the size of which is L1mm, and 0.05mm≤L1mm≤84mm. The first connecting post 223 and the second connecting post 224 have a second gap in the front-back direction, the size of which is L2mm, and 0.05mm≤L2mm≤42mm.

[0054] By setting the dimensions L1 of the first interval and L2 of the second interval within the aforementioned range, the relationship between the volume of the assembly part 22 and the heat exchange effect can be balanced. If L1 or L2 is too small, the heat exchange effect between the fluids inside the two second heat exchange channels 222 may be more significant; if L1 or L2 is too large, the volume of the assembly part 22 will be too large.

[0055] The size L1mm of the first interval can be 0.05mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 84mm, or other values ​​between 0.05mm and 84mm.

[0056] The second interval dimension L2mm can be 0.05mm, 10mm, 20mm, 30mm, 40mm, 42mm, or other values ​​between 0.05mm and 42mm.

[0057] The housing connecting flange 211 extends away from the first heat exchange channel 212. By designing the housing connecting flange 211 to extend away from the first heat exchange channel 212, the connection method between the heat exchange plate and the external housing is optimized. This design ensures a tighter connection between the heat exchange plate and the housing. It also facilitates the installation and removal of the heat exchange plate.

[0058] In this embodiment, the base 21 is provided with box-connecting flanges 211 on both sides in the left-right direction. By providing box-connecting flanges 211 on both the left and right sides of the base 21, the box-connecting flanges 211 on both sides can be connected to the box at the same time, thereby further improving the assembly stability.

[0059] The assembly part 22 and the heat exchange plate base 10 are each provided with a positioning post 41, and the other assembly part 22 and the heat exchange plate base 10 are provided with a positioning hole, into which the positioning post 41 is inserted. By providing the positioning post 41 and the positioning hole between the assembly part 22 and the heat exchange plate base 10, the assembly accuracy of the heat exchange plate is optimized, and the stability and sealing of the connection are improved.

[0060] Specifically, the cooperation between the positioning post 41 and the positioning hole ensures accurate alignment between the assembly part 22 and the heat exchange plate base 10. It also facilitates the installation and removal of the heat exchange plate.

[0061] like Figure 5 As shown, in this embodiment, the assembly part 22 is provided with a positioning post 41, and the heat exchange plate base 10 is provided with a positioning hole.

[0062] Specifically, the assembly part 22 is provided with two positioning posts 41, which are respectively located at the two corners of the assembly part 22 and at both ends of the first collection cavity 2211 along its length. The heat exchange plate base 10 is provided with two positioning holes, which correspond one-to-one with the two positioning posts 41.

[0063] Another embodiment of this utility model provides a battery pack, which includes a heat exchange plate, the heat exchange plate being the one described above. Therefore, this battery pack also solves the problem of poor current collector assembly stability in related technologies, which will not be elaborated further here.

[0064] Another embodiment of this utility model provides an electrical device, which includes a battery pack, specifically the battery pack described above. Therefore, this electrical device also solves the problem of poor current collector assembly stability in related technologies, which will not be elaborated further here.

[0065] Electrical devices include, but are not limited to, vehicles.

[0066] The apparatus provided by the embodiments mainly has the following beneficial effects:

[0067] (1) First, the assembly part 22 is connected to the heat exchange plate base 10, thereby connecting the current collector 20 to the heat exchange plate base 10 and achieving a first-level fixation of the current collector 20. Second, the base 21 is provided with a housing connection flange 211, through which the current collector 20 is connected to the housing of the battery pack, achieving a second-level fixation of the current collector 20. In other words, the current collector 20 is assembled using a double-fixation structure, which can improve the assembly stability.

[0068] (2) Since the first heat exchange channel 212 and the second heat exchange channel 222 are set at an angle, the flow path of the fluid inside the heat exchange plate is optimized, the flow efficiency and heat exchange efficiency of the fluid are improved, and the collector 20 is convenient to connect with the heat exchange plate substrate 10 and the water source.

[0069] (3) By arranging the inlet 121 and outlet 122, as well as the first and second manifolds 2211 and 2212 in the front-to-back direction, the structural layout of the heat exchange plate is optimized, improving space utilization. Furthermore, the front-to-back arrangement not only simplifies the manufacturing process of the heat exchange plate and reduces production costs, but also facilitates the connection between the heat exchange plate and external pipes, improving installation convenience. By placing the inlet 121 inside the outlet 122, the distance of the heat exchange medium from the inlet 121 to the heat exchange channel 11 is shortened, thereby accelerating the response speed of the heat exchange medium and improving heat exchange efficiency.

[0070] (4) By providing a partition wall 23 between the first collection cavity 2211 and the second collection cavity 2212 and controlling the thickness C of the partition wall 23, the structure of the collection fluid is optimized. The partition wall 23 can be used to separate the first collection cavity 2211 and the second collection cavity 2212, ensuring that the heat exchange media in the first collection cavity 2211 and the second collection cavity 2212 will not affect each other.

[0071] The battery in this application is a secondary battery, also known as a rechargeable battery or storage battery, which refers to a battery that can be used again after being discharged by recharging to activate the active materials.

[0072] Typically, a secondary battery includes an electrode assembly, an electrolyte, and an outer casing. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The electrode assembly and electrolyte are assembled inside the outer casing. During charging and discharging, active ions (such as lithium ions) move back and forth between the positive and negative electrodes, inserting and extracting. The separator, positioned between the positive and negative electrodes, primarily prevents short circuits while allowing active ions to pass through. The electrolyte, located between the positive and negative electrodes, mainly serves to conduct active ions.

[0073] As an example, the preparation process of a secondary battery is as follows: the positive electrode, separator, and negative electrode are stacked in sequence, with the separator acting as a separator between the positive and negative electrodes. Then, the electrodes are wound or stacked to obtain an electrode assembly. The electrode assembly is placed in an outer packaging shell, dried, and then injected with electrolyte. After vacuum sealing, settling, formation, and shaping, a secondary battery is obtained.

[0074] A positive electrode typically includes a positive current collector and a positive electrode film layer disposed on at least one side of the positive current collector. The positive electrode film layer includes a positive electrode active material, which can be any existing publicly disclosed positive electrode active material or a positive electrode active material optimized based on existing materials.

[0075] This application does not impose any particular restrictions on the type of positive electrode active material for the positive electrode sheet. As an example, the positive electrode active materials in this application include lithium-containing transition metal oxides (e.g., LiCoO2), phosphides (e.g., LiFePO4), or lithium intercalation compounds (e.g., positive electrode materials for binary lithium batteries such as lithium cobalt oxide and lithium nickel oxide, or positive electrode materials for ternary lithium batteries such as lithium nickel cobalt manganese oxide and lithium nickel cobalt aluminum oxide).

[0076] In some embodiments, the positive electrode sheet can be prepared by dispersing the above-mentioned components for preparing the positive electrode sheet, such as positive electrode active material, conductive agent, binder and any other components, in a solvent (e.g., N-methylpyrrolidone) to form a positive electrode slurry; coating the positive electrode slurry onto the positive electrode current collector, and then obtaining the positive electrode sheet after drying, rolling, cutting and other processes.

[0077] In this application, the binder is used to improve the adhesion between positive electrode active material particles and the adhesion between the positive electrode active material and the current collector. This application does not impose any particular limitation on the type of binder for the positive electrode sheet; the binder can be any conventional choice in the battery industry. Specifically, the binder can be at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyvinyl alcohol (PVA), styrene-butadiene rubber (SBR), polyacrylonitrile (PAN), polyimide (PI), polyacrylic acid (PAA), polyacrylate, polyolefin, sodium carboxymethyl cellulose (CMC), or sodium alginate.

[0078] This application does not impose any particular restrictions on the positive electrode current collector, as long as it is conductive and will not cause adverse chemical changes in the battery, and can be made of, for example: stainless steel, aluminum, nickel, titanium, sintered carbon; or aluminum or stainless steel that has been surface treated with one of carbon, nickel, titanium, silver, etc.

[0079] The negative electrode includes a negative electrode current collector and a negative electrode active material layer disposed on at least one side of the negative electrode current collector. The negative electrode active material layer comprises a silicon-based material. This application does not specifically limit the type of silicon-based material; the silicon-based material can be a silicon-carbon material and / or a silicon-oxygen material. As an example, the silicon-based material can be one or more of silicon-carbon composite negative electrode materials, silicon suboxide negative electrode materials, modified silicon suboxide negative electrode materials, and nano-silicon materials. The negative electrode active material in the negative electrode active material layer may also optionally include one or more of artificial graphite, natural graphite, and hard carbon.

[0080] In some embodiments, the negative electrode sheet can be prepared by dispersing the components used to prepare the negative electrode sheet, such as the negative electrode active material, conductive agent, binder and any other components, in a solvent (e.g., water) to form a negative electrode slurry; coating the negative electrode slurry onto the negative electrode current collector, and then obtaining the negative electrode sheet after drying, rolling, cutting and other processes.

[0081] This application does not specifically limit the type of negative electrode conductive agent. In some embodiments, as an example, the negative electrode conductive agent can be one or more of conventional negative electrode conductive agents such as acetylene black and carbon nanotubes.

[0082] This application does not specifically limit the type of negative electrode binder. In some embodiments, as an example, the binder can 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 can be (34.38-74.29):(20-59.38):(5-7.14).

[0083] This application does not impose specific limitations on the type of negative electrode current collector. In some embodiments, as an example, the negative electrode current collector can be one of the conventional negative electrode current collectors such as copper foil.

[0084] The electrolyte acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. As an example, the electrolyte in this application can be any electrolyte suitable for electrochemical energy storage devices in the art. The electrolyte includes an electrolyte and a solvent; the electrolyte typically includes a lithium salt, and additives may also be added to the electrolyte.

[0085] Specifically, the lithium salt includes at least one selected from lithium hexafluorophosphate (LiPF6), lithium tetrafluoroborate (LiBF4), lithium perchlorate (LiClO4), lithium hexafluoroarsenate (LiAsF6), lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium trifluoromethanesulfonate (LiTFS), lithium difluorooxalate borate (LiDFOB), lithium dioxalate borate (LiBOB), lithium difluorophosphate (LiPO2F2), lithium difluorodioxalate phosphate (LiDFOP), and lithium tetrafluorooxalate phosphate (LiTFOP). The concentration of the electrolyte in the electrolyte solution can be 0.5–5 mol / L.

[0086] Specifically, the solvent includes at least one of ethylene carbonate (EC), propylene carbonate (PC), methyl ethyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), butyl carbonate (BC), fluoroethylene carbonate (FEC), methyl formate (MF), methyl acetate (MA), ethyl acetate (EA), propyl acetate (PA), methyl propionate (MP), ethyl propionate (EP), propyl propionate (PP), methyl butyrate (MB), ethyl butyrate (EB), 1,4-butyrolactone (GBL), sulfolane (SF), dimethyl sulfone (MSM), methyl ethyl sulfone (EMS), and diethyl sulfone (ESE).

[0087] In some implementations, as an example, the additive may be a conventional electrolyte additive such as fluoroethylene carbonate (FEC), chloroethylene carbonate (CEC), or vinylene carbonate (VC).

[0088] In some embodiments, the secondary battery also includes a separator. This application does not impose any particular limitation on the type of separator; any known porous separator with good chemical and mechanical stability can be selected.

[0089] In some embodiments, as an example, the diaphragm can be one of PP, PE, or PP / PF; the diaphragm can also be a structure in which a coating is formed on the surface of the base film, wherein the base film coating can be one of PP, PE, or PP / PF, and the coating can be an inorganic coating and / or an organic coating. The inorganic coating can be selected from alumina ceramic layers, osmium silicate, etc., and the organic coating can be selected from PVDF, etc.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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 heat exchange plate, characterized in that, The heat exchange plate includes: The heat exchange plate base (10) has a heat exchange channel (11) and a water inlet (12) connected to the heat exchange channel (11); The current collector (20) includes a base (21) and an assembly part (22). The assembly part (22) is disposed on the base (21) and is connected to the heat exchange plate base (10). The base (21) is provided with a box connection flange (211). The assembly part (22) is provided with a flow collecting cavity (221), which is corresponding to the water inlet (12). The base (21) is provided with a first heat exchange channel (212), and the assembly part (22) is provided with a second heat exchange channel (222). The first heat exchange channel (212) and the second heat exchange channel (222) are connected at their first ends, and the flow collecting cavity (221) is connected to the second end of the second heat exchange channel (222). The first heat exchange channel (212) and the second heat exchange channel (222) are arranged at an angle.

2. The heat exchange plate according to claim 1, characterized in that, The water inlet (12) includes an inlet (121) and an outlet (122). The collecting chamber (221) includes a first collecting chamber (2211) and a second collecting chamber (2212). The first collecting chamber (2211) is correspondingly arranged with the inlet (121), and the second collecting chamber (2212) is correspondingly arranged with the outlet (122). The substrate (21) is provided with two first heat exchange channels (212) and two second heat exchange channels (222). The two first heat exchange channels (212) are respectively connected to the first ends of the two second heat exchange channels (222). The second end of the first second heat exchange channel (222) is connected to the first collection cavity (2211). The second end of the second second heat exchange channel (222) is connected to the second collection cavity (2212). The two first heat exchange channels (212) are respectively arranged at an angle to the two second heat exchange channels (222).

3. The heat exchange plate according to claim 2, characterized in that, The two first heat exchange channels (212) extend in parallel directions.

4. The heat exchange plate according to claim 2, characterized in that, The two second heat exchange channels (222) extend in parallel directions.

5. The heat exchange plate according to claim 2, characterized in that, The inlet (121) and the outlet (122) are arranged in the front-to-back direction, and the first collection cavity (2211) and the second collection cavity (2212) are arranged in the front-to-back direction.

6. The heat exchange plate according to claim 2, characterized in that, The inlet (121) is located inside the outlet (122).

7. The heat exchange plate according to claim 2, characterized in that, A partition wall (23) is provided between the first collection cavity (2211) and the second collection cavity (2212), and the thickness of the partition wall (23) is C mm, where 4 mm ≤ C mm ≤ 12 mm.

8. The heat exchange plate according to claim 2, characterized in that, There are at least two water inlets (121), arranged in a left-right direction. The first collecting cavity (2211) is a long strip structure, covering the at least two water inlets (121); and / or, There are at least two water outlets (122), arranged in a left-right direction. The second collection cavity (2212) is a long strip structure, covering the at least two water outlets (122); and / or, The length of the second collector cavity (2212) is greater than the length of the first collector cavity (2211).

9. The heat exchange plate according to claim 2, characterized in that, The current collector (20) also includes two connecting pipes, which are respectively inserted into the two first heat exchange channels (212).

10. The heat exchange plate according to any one of claims 1 to 9, characterized in that, The angle between the first heat exchange channel (212) and the second heat exchange channel (222) is X°, where 75°≤X°≤105°.

11. The heat exchange plate according to any one of claims 1 to 9, characterized in that, The aperture of the first heat exchange channel (212) is larger than the aperture of the second heat exchange channel (222).

12. The heat exchange plate according to any one of claims 1 to 9, characterized in that, The base (21) protrudes forward from the assembly part (22).

13. The heat exchange plate according to any one of claims 2 to 9, characterized in that, The assembly part (22) includes a first connecting post (223), a second connecting post (224), and a connecting base (225). One end of the first connecting post (223) is connected to the base (21), and the other end of the first connecting post (223) is connected to the connecting base (225). One end of the second connecting post (224) is connected to the base (21), and the other end of the second connecting post (224) is connected to the connecting base (225). The first second heat exchange channel (222) penetrates the first connecting column (223), and the second second heat exchange channel (222) penetrates the second connecting column (224); Both the first collecting cavity (2211) and the second collecting cavity (2212) are disposed on the connecting base (225).

14. The heat exchange plate according to claim 13, characterized in that, The first connecting post (223) and the second connecting post (224) have a first gap in the left-right direction, and the size of the first gap is L1mm, 0.05mm≤L1mm≤84mm.

15. The heat exchange plate according to claim 13, characterized in that, The first connecting post (223) and the second connecting post (224) have a second gap in the front-back direction, and the size of the second gap is L2mm, 0.05mm≤L2mm≤42mm.

16. The heat exchange plate according to any one of claims 1 to 9, characterized in that, The housing connecting flange (211) extends in a direction away from the first heat exchange channel (212).

17. The heat exchange plate according to any one of claims 1 to 9, characterized in that, The base (21) is provided with box-connecting flanges (211) on both sides in the left and right directions.

18. The heat exchange plate according to any one of claims 1 to 9, characterized in that, One of the assembly part (22) and the heat exchange plate base (10) is provided with a positioning post (41), and the other of the assembly part (22) and the heat exchange plate base (10) is provided with a positioning hole, and the positioning post (41) is inserted into the positioning hole.

19. A battery pack, characterized in that, The battery pack includes a heat exchange plate, which is the heat exchange plate according to any one of claims 1 to 18.

20. An electrical device, characterized in that, The electrical device includes a battery pack, which is the battery pack according to claim 19.

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