Heat exchange plate, battery pack and electric device

Abstract

The utility model provides a kind of heat exchange plate, battery pack and electric device, the heat exchange plate includes plate body and is arranged in the heat exchange runner of plate body, one side of plate body in its thickness direction is first battery heat exchange surface, another side of plate body in its thickness direction is second battery heat exchange surface, heat exchange plate has the monomer heat exchange section corresponding monomer battery setting, monomer heat exchange section includes thickness thinning area, and the thickness of thickness thinning area gradually decreases in the direction of monomer heat exchange section outer edge pointing middle portion. Through the technical scheme provided in the present application, the problem of abnormal explosion caused by battery expansion in related technology 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] In current battery cooling technologies, with the increasing prevalence of electric vehicles and other high-power-demand devices, efficient thermal management of the batteries within the battery pack has become particularly important. Heat exchange between the battery and the liquid cooling plate is one of the key aspects of achieving battery temperature control.

[0003] In related technologies, liquid cooling plates are typically designed as flat plates with channels for coolant flow, allowing them to remove heat generated during battery operation through direct contact. Specifically, the assembly method between the liquid cooling plate and the battery relies primarily on close contact between the battery side and the liquid cooling plate to achieve efficient heat exchange.

[0004] However, this traditional liquid cooling plate design faces a significant problem: the expansion space of the battery after assembly with the liquid cooling plate is extremely limited. The battery will expand during use, and due to the close contact between the battery and the liquid cooling plate, it may eventually lead to abnormal explosion of the battery. Utility Model Content

[0005] This invention provides a heat exchange plate, a battery pack, and an electrical device to solve the problem of abnormal explosion caused by battery expansion in related technologies.

[0006] According to one aspect of the present invention, a heat exchange plate is provided, the heat exchange plate including a plate body and a heat exchange channel disposed on the plate body, one side of the plate body in the thickness direction is a first battery heat exchange surface, the other side of the plate body in the thickness direction is a second battery heat exchange surface, the heat exchange plate has a single-cell heat exchange section disposed corresponding to a single cell, the single-cell heat exchange section includes a thickness reduction region, and the thickness of the thickness reduction region gradually decreases in the direction from the outer edge of the single-cell heat exchange section towards the middle.

[0007] According to another aspect of the present invention, a battery pack is provided, the battery pack including individual batteries and a heat exchange plate, the side of the individual battery being disposed corresponding to a first battery heat exchange surface or a second battery heat exchange surface of the heat exchange plate, and 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] By applying the technical solution of this utility model, a certain amount of space is allowed for the battery to expand, avoiding excessive pressure on the part of the battery in direct contact with the heat exchange plate due to expansion, thereby reducing or eliminating the risk of abnormal battery explosion. Specifically, the design of the thinner region utilizes the elastic deformation characteristics of the material; that is, when the battery expands, the thinner part is more likely to deform, providing additional expansion space for the battery. Therefore, adopting the above structure can effectively improve the safety and service life of the battery while maintaining good heat exchange performance. 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 This diagram shows a structural schematic of the heat exchange plate provided in an embodiment of the present invention from another perspective;

[0013] Figure 3 A front view of the heat exchange plate provided in an embodiment of the present invention is shown;

[0014] Figure 4 It shows Figure 3 Sectional view at point AA;

[0015] Figure 5 It shows Figure 3 A cross-sectional view of another embodiment at point AA;

[0016] Figure 6 A cross-sectional view of the heat exchange plate provided in an embodiment of the present invention is shown;

[0017] Figure 7 A schematic diagram of the battery pack provided in an embodiment of the present invention is shown;

[0018] Figure 8 A side view of the battery pack provided in an embodiment of the present invention is shown;

[0019] Figure 9 This diagram shows a structural schematic of the battery pack provided in an embodiment of the present invention from another perspective.

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

[0021] 10. Plate body; 11. First battery heat exchange surface; 12. Second battery heat exchange surface; 13. Individual cell heat exchange section; 131. Thickness reduction zone; 1311. Thinning sub-zone; 132. First straight zone; 133. Clearance hole; 134. Second straight zone;

[0022] 20. Heat exchange channel; 21. Annular channel;

[0023] 30. First battery connector;

[0024] 40. Second battery connector; 41. Explosion-proof valve clearance groove;

[0025] 50. Single battery cell; 51. First side; 52. Second side; 53. Explosion-proof valve;

[0026] 60. Heat exchange plate;

[0027] 70. Battery array;

[0028] D1, the thickness at the outer edge of the thickness reduction zone;

[0029] D2, the thickness at the inner edge of the thickness reduction zone;

[0030] L1, the width of the heat exchange plate;

[0031] L2, the dimension of the thickness reduction zone in the width direction of the heat exchange plate. Detailed Implementation

[0032] 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.

[0033] like Figures 1 to 9 As shown, this utility model embodiment provides a heat exchange plate, which includes a plate body 10 and a heat exchange channel 20 disposed on the plate body 10. One side of the plate body 10 in the thickness direction is a first battery heat exchange surface 11, and the other side of the plate body 10 in the thickness direction is a second battery heat exchange surface 12. The heat exchange plate has a single-cell heat exchange section 13 corresponding to a single cell 50. The single-cell heat exchange section 13 includes a thickness reduction region 131, and the thickness of the thickness reduction region 131 gradually decreases in the direction from the outer edge of the single-cell heat exchange section 13 towards the center.

[0034] The heat exchange plate provided in this embodiment allows for some space during battery expansion, preventing excessive pressure on the battery-heat exchange plate contact area due to expansion, thereby reducing or eliminating the risk of abnormal battery explosion. Specifically, the design of the thickness reduction region 131 utilizes the elastic deformation characteristics of the material; that is, the thinner portion deforms more easily during battery expansion, providing additional expansion space for the battery. Therefore, the above structure effectively improves battery safety and lifespan while maintaining good heat exchange performance.

[0035] In this embodiment, the heat exchange plate has a symmetrical structure in its thickness direction. This symmetrical structure ensures balanced heat exchange performance on both sides of the plate and enhances the overall stability of the plate.

[0036] Specifically, the symmetrical design helps to evenly distribute the coolant flowing through the heat exchange channel 20, thereby improving the heat exchange efficiency of the entire heat exchange plate. This not only improves the heat exchange performance of the heat exchange plate but also enhances its mechanical strength and extends its service life.

[0037] In this embodiment, the thickness reduction region 131 has a centrosymmetric structure, and the center of the single-cell heat exchange section 13 is the center of symmetry of the thickness reduction region 131. The centrosymmetric thickness reduction region 131 can more effectively disperse the stress generated by battery expansion and reduce the situation of excessive local stress on the battery.

[0038] Specifically, the central symmetry design follows mechanical principles, enabling the thickness reduction zone 131 to deform uniformly when the battery expands, preventing damage to the battery due to local stress concentration, further improving battery safety, while maintaining good heat exchange performance.

[0039] like Figure 1 As shown, in some embodiments, the single-unit heat exchange section 13 further includes a first flat region 132, the inner edge of the thickness reduction region 131 is connected to the outer edge of the first flat region 132, and the thickness of the first flat region 132 remains unchanged in the direction from its outer edge to the center. The first flat region 132 can improve the structural strength of the heat exchange plate without affecting the expansion space provided by the thickness reduction region 131 for the battery.

[0040] The presence of the first flat region 132 increases the rigidity of the heat exchange plate to a certain extent, preventing the heat exchange plate from deforming as a whole when the battery expands, thus affecting the normal operation of the battery. Specifically, the setting of the first flat region 132 utilizes the rigidity of the material to provide a stable support surface for the battery, ensuring good contact between the battery and the heat exchange plate.

[0041] like Figure 5As shown, in some embodiments, the middle part of the single heat exchange section 13 has a clearance hole 133, and the inner edge of the thickness reduction region 131 forms the clearance hole 133, which can provide a larger expansion space.

[0042] like Figure 1 As shown, in this embodiment, the single-unit heat exchange section 13 has a polygonal structure, and the thickness reduction region 131 has multiple thinning sub-regions 1311. These multiple thinning sub-regions 1311 correspond one-to-one with multiple sides of the polygonal structure, and the thickness of each thinning sub-region 1311 gradually decreases along the outer edge of the single-unit heat exchange section 13 towards the center. Using the above structure, the polygonal single-unit heat exchange section 13 and the corresponding thinning sub-regions 1311 design can better adapt to the shape of the battery and improve heat exchange efficiency.

[0043] In this embodiment, the side surface of the thinning sub-region 1311 is a bevel, which has the advantage of being easy to process.

[0044] Specifically, the design of the thinning sub-region 1311 on the slope simplifies the manufacturing process and reduces production costs. Furthermore, the slope design follows fluid dynamics principles, helping to guide the flow of coolant within the heat exchange channel 20 and improving heat exchange efficiency.

[0045] like Figure 4 As shown, the thickness at the outer edge of the thickness reduction region 131 is D1mm, and the thickness at the inner edge of the thickness reduction region 131 is D2mm, where 1.2mm≤D1-D2≤5mm. Setting D1-D2 within the above range allows the thickness reduction region 131 to provide expansion space for the battery without affecting the structural strength of the heat exchange plate.

[0046] Wherein, D1-D2 can be 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5mm, and other values ​​between 1.2mm and 5mm.

[0047] like Figure 3 As shown, the width of the heat exchange plate is L1 mm, and the dimension of the thickness reduction region 131 in the width direction of the heat exchange plate is L2 mm, where 0.7 ≤ L2 / L1 ≤ 0.95. Setting L2 / L1 within the above range allows for the provision of expansion space for the battery using the thickness reduction region 131 without affecting the structural strength of the heat exchange plate.

[0048] It should be noted that the ratio of L2 to L1 controls the coverage area of ​​the thickness reduction zone 131, ensuring a reasonable allocation of the battery expansion space. This design follows the principles of heat conduction and stress analysis; that is, by adjusting the ratio of L2 / L1, sufficient expansion space can be provided for the battery while ensuring the heat exchange performance and structural strength of the heat exchange plate.

[0049] Where L2 / L1 can be 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, and other values ​​between 0.7 and 0.95.

[0050] like Figure 1 As shown, in some embodiments, the heat exchange plate has multiple heat exchange channels 20, which are spaced apart in the width direction of the heat exchange plate. At least two heat exchange channels 20 are correspondingly arranged at the center of the thickness reduction region 131, and the at least two heat exchange channels 20 are symmetrically arranged on both sides of the center of the thickness reduction region 131. With the above structure, the at least two heat exchange channels 20 are symmetrically arranged on both sides of the center of the thickness reduction region 131, which reduces the structural strength at the center of the thickness reduction region 131, facilitates deformation at the center of the thickness reduction region 131, and thus facilitates adaptation to battery expansion.

[0051] like Figure 5 and Figure 6 As shown, in some embodiments, the central part of the single heat exchange section 13 has a clearance hole 133, and the inner edge of the thickness reduction region 131 forms the clearance hole 133. An annular flow channel 21 is provided around the outer periphery of the clearance hole 133, and the annular flow channel 21 is connected to at least two heat exchange channels 20 located at the center of the corresponding thickness reduction region 131. With the above structure, the annular flow channel 21 achieves communication with at least two heat exchange channels 20 located at the center of the corresponding thickness reduction region 131, ensuring smooth flow of the heat exchange medium.

[0052] In this design, the flow area of ​​all heat exchange channels 20 is the same. This design ensures that the flow velocity and flow rate of the coolant are consistent in all heat exchange channels 20, thereby improving heat exchange efficiency.

[0053] Specifically, the heat exchange channels 20 with the same flow area follow the principles of fluid dynamics. By controlling the flow area of ​​the channels, the uniform distribution of coolant within the heat exchange plate can be ensured, improving heat exchange between the coolant and the battery. This structure improves the thermal management performance of the battery pack, reduces battery temperature, and extends battery life.

[0054] like Figure 1 As shown, in some embodiments, the individual heat exchange section 13 further includes a second flat region 134, which surrounds the outer side of the thickness reduction region 131. The thickness of the second flat region 134 remains constant in the direction from its outer edge to the center, and the outer edge of the second flat region 134 is the outer edge of the individual heat exchange section 13. By providing the second flat region 134, the structural strength of the outer edge of the individual heat exchange section 13 is relatively high.

[0055] Specifically, the presence of the second flat region 134 increases the rigidity of the heat exchange plate, preventing overall deformation of the heat exchange plate during battery expansion and thus ensuring normal battery operation. The design of the second flat region 134 follows the principles of materials mechanics, namely, by increasing the rigidity of the heat exchange plate, unnecessary deformation of the heat exchange plate during battery expansion can be prevented, maintaining good contact between the battery and the heat exchange plate, thereby improving the structural stability of the heat exchange plate and the reliability of the battery.

[0056] In some embodiments, the outer edge of the thickness reduction region 131 is the outer edge of the single heat exchange section 13. This design simplifies the structure of the heat exchange plate and reduces manufacturing costs.

[0057] like Figure 1 As shown, the heat exchange plate has multiple individual heat exchange sections 13, which are arranged sequentially along the length of the heat exchange plate. This design ensures uniform heat exchange for all batteries within the battery pack, improves the overall thermal management performance of the battery pack, reduces battery temperature, and extends battery life.

[0058] like Figure 1 As shown, the heat exchange plate has a first battery connecting piece 30 at its first end in the width direction, which can engage with the shoulder of the individual battery 50. The design of the first battery connecting piece 30 ensures precise alignment between the battery and the heat exchange plate, improving heat exchange efficiency and assembly firmness.

[0059] like Figure 1 As shown, the heat exchange plate has a second battery connecting piece 40 at its second end in the width direction, which can cooperate with the shoulder of the single battery 50 for positioning. The design of the second battery connecting piece 40, together with the first battery connecting piece 30, ensures the stable fixation of the heat exchange plate and improves the heat exchange efficiency.

[0060] Specifically, the second battery connector 40 has an explosion-proof valve clearance groove 41. The design of the explosion-proof valve clearance groove 41 provides clearance space for the battery's explosion-proof valve 53, preventing direct contact between the explosion-proof valve 53 and the heat exchange plate, thus ensuring the normal operation of the explosion-proof valve. This design follows battery safety design principles, ensuring that when the battery expands to a certain extent, the explosion-proof valve can open normally, releasing internal battery pressure and preventing battery explosion, significantly improving the safety of the battery pack.

[0061] It should be noted that the heat exchange plate in this embodiment can be a water-cooled plate.

[0062] Another embodiment of this utility model provides a battery pack, which includes a single battery cell 50 and a heat exchange plate 60. The side of the single battery cell 50 is disposed corresponding to the first battery heat exchange surface 11 or the second battery heat exchange surface 12 of the heat exchange plate 60, which is the heat exchange plate provided above. Therefore, this battery pack also allows the battery to have a certain space when it expands, avoiding excessive pressure on the part of the battery in direct contact with the heat exchange plate due to expansion, thereby reducing or eliminating the risk of abnormal battery explosion.

[0063] like Figure 7 As shown, the battery pack includes multiple battery rows 70, each battery row 70 comprising multiple individual cells 50, with heat exchange plates 60 located between adjacent battery rows 70. This design ensures uniform heat exchange for all cells within the battery pack, improving the overall thermal management performance of the battery pack, reducing battery temperature, and extending battery life.

[0064] like Figure 7 As shown, a single cell 50 has a first side 51 and a second side 52, with the area of ​​the first side 51 being larger than the area of ​​the second side 52. A heat exchange plate 60 is located between the first sides 51 of two adjacent single cells 50. This design fully utilizes the large side surface of the battery, improving heat exchange efficiency; that is, by increasing the contact area, the heat dissipation effect of the battery can be improved.

[0065] Another embodiment of this utility model provides an electrical device including a battery pack, which is the battery pack provided above. Therefore, this electrical device also allows for some space when the battery expands, avoiding excessive pressure on the part of the battery in direct contact with the heat exchange plate due to expansion, thereby reducing or eliminating the risk of abnormal battery explosion.

[0066] Electrical devices include, but are not limited to, vehicles.

[0067] The apparatus provided by the embodiments mainly has the following beneficial effects:

[0068] (1) By setting a thickness reduction zone 131, when the battery expands, the thickness reduction zone can undergo a certain deformation to provide additional expansion space for the battery, effectively avoiding safety problems caused by excessive internal pressure due to battery expansion, such as abnormal explosion.

[0069] (2) The symmetrical structure of the heat exchange plate and the central symmetrical design of the thickness reduction zone 131 can not only provide more expansion space for the battery, but also ensure that the cooling effect on both sides of the battery is consistent, further improving the working stability of the battery pack.

[0070] (3) The design of the polygonal single heat exchange section 13 and the corresponding thinning sub-region 1311 can better adapt to the shape of the battery and improve the heat exchange efficiency.

[0071] (4) The design of the first battery connecting piece 30 and the second battery connecting piece 40 ensures precise alignment between the battery and the heat exchange plate, improving heat exchange efficiency and assembly firmness.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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).

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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).

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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).

[0088] 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).

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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 a plate body (10) and a heat exchange channel (20) disposed on the plate body (10). One side of the plate body (10) in its thickness direction is a first battery heat exchange surface (11), and the other side of the plate body (10) in its thickness direction is a second battery heat exchange surface (12). The heat exchange plate has a single-cell heat exchange section (13) disposed corresponding to a single cell (50). The single-cell heat exchange section (13) includes a thickness reduction region (131), and the thickness of the thickness reduction region (131) gradually decreases in the direction from the outer edge of the single-cell heat exchange section (13) towards the center.

2. The heat exchange plate according to claim 1, characterized in that, The heat exchange plate has a symmetrical structure in its thickness direction.

3. The heat exchange plate according to claim 1, characterized in that, The thickness reduction region (131) has a centrally symmetrical structure, and the center of the single heat exchange section (13) is the center of symmetry of the thickness reduction region (131).

4. The heat exchange plate according to claim 1, characterized in that, The single heat exchange section (13) further includes a first flat region (132), the inner edge of the thickness reduction region (131) is connected to the outer edge of the first flat region (132), and the thickness of the first flat region (132) remains unchanged in the direction from its outer edge to the center.

5. The heat exchange plate according to claim 1, characterized in that, The individual heat exchange section (13) has a clearance hole (133) in the middle, and the inner edge of the thickness reduction area (131) forms the clearance hole (133).

6. The heat exchange plate according to claim 1, characterized in that, The single heat exchange section (13) is a polygonal structure. The thickness reduction area (131) has multiple thinning sub-regions (1311). The multiple thinning sub-regions (1311) are arranged one-to-one with the multiple sides of the polygonal structure. The thickness of each thinning sub-region (1311) gradually decreases along the outer edge of the single heat exchange section (13) in the direction pointing to the middle.

7. The heat exchange plate according to claim 6, characterized in that, The side of the thinning sub-region (1311) is a slope.

8. The heat exchange plate according to claim 1, characterized in that, The thickness at the outer edge of the thickness reduction area (131) is D1, in mm, and the thickness at the inner edge of the thickness reduction area (131) is D2, in mm, where 1.2 mm ≤ D1 - D2 ≤ 5 mm.

9. The heat exchange plate according to claim 1, characterized in that, The width of the heat exchange plate is L1, in mm, and the thickness reduction zone (131) has a dimension of L2 in the width direction of the heat exchange plate, in mm, where 0.7 ≤ L2 / L1 ≤ 0.

95.

10. The heat exchange plate according to claim 1, characterized in that, The heat exchange plate has a plurality of heat exchange channels (20), which are spaced apart in the width direction of the heat exchange plate. At least two heat exchange channels (20) are provided at the center of the thickness reduction zone (131), and at least two heat exchange channels (20) are symmetrically arranged on both sides of the center of the thickness reduction zone (131).

11. The heat exchange plate according to claim 10, characterized in that, The individual heat exchange section (13) has a clearance hole (133) in the middle, and the inner edge of the thickness reduction area (131) surrounds the clearance hole (133). The outer periphery of the clearance hole (133) is provided with an annular flow channel (21), and the annular flow channel (21) is connected to at least two heat exchange channels (20) provided at the center of the corresponding thickness reduction zone (131).

12. The heat exchange plate according to claim 10, characterized in that, The flow area of ​​all of the heat exchange channels (20) is the same.

13. The heat exchange plate according to any one of claims 1 to 12, characterized in that, The single-unit heat exchange section (13) further includes a second flat region (134), which surrounds the outside of the thickness reduction region (131). The thickness of the second flat region (134) remains unchanged in the direction from its outer edge to the center. The outer edge of the second flat region (134) is the outer edge of the single-unit heat exchange section (13).

14. The heat exchange plate according to any one of claims 1 to 12, characterized in that, The outer edge of the thickness reduction region (131) is the outer edge of the single-unit heat exchange section (13).

15. The heat exchange plate according to any one of claims 1 to 12, characterized in that, The heat exchange plate has multiple individual heat exchange sections (13), which are arranged sequentially along the length of the heat exchange plate.

16. The heat exchange plate according to any one of claims 1 to 12, characterized in that, The heat exchange plate is provided with a first battery connecting piece (30) at its first end in the width direction, which can cooperate with the shoulder of the single battery cell (50).

17. The heat exchange plate according to any one of claims 1 to 12, characterized in that, The heat exchange plate is provided with a second battery connecting piece (40) at its second end in the width direction, which can cooperate with the shoulder of the single battery (50).

18. The heat exchange plate according to claim 17, characterized in that, The second battery connector (40) has an explosion-proof valve clearance groove (41).

19. A battery pack, characterized in that, The battery pack includes a single battery cell (50) and a heat exchange plate (60). The side of the single battery cell (50) is provided corresponding to the first battery heat exchange surface (11) or the second battery heat exchange surface (12) of the heat exchange plate (60). The heat exchange plate (60) is the heat exchange plate according to any one of claims 1 to 18.

20. The battery pack according to claim 19, characterized in that, The battery pack includes multiple battery rows (70), each battery row (70) includes multiple individual cells (50), and the heat exchange plate (60) is located between two adjacent battery rows (70).

21. The battery pack according to claim 19, characterized in that, The single cell (50) has a first side (51) and a second side (52), the area of ​​the first side (51) is larger than the area of ​​the second side (52), and the heat exchange plate (60) is located between the first side (51) of two adjacent single cells (50).

22. An electrical appliance, characterized in that, The electrical device includes a battery pack, which is the battery pack according to any one of claims 19 to 21.

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