Prism battery and energy storage device with rapid temperature control

Abstract

The utility model embodiment relates to a kind of prismatic battery and energy storage device of quick temperature control, battery includes electric core, liquid guide core stick, shell, positive pole liquid collecting cover plate assembly, positive pole current collector, negative pole current collector and bottom liquid collecting cover plate, the electric core inside is implanted by the present application liquid guide core stick and is bound electric core expansion, strengthens electric core rigidity, avoids later cycle deformation, is favorable for long cycle;And, by the conception of the shell and the built-in core stick combined by quick cooling or heating, the electric core temperature is homogenized, so that the electric core temperature is consistent inside and outside, avoid the degradation of electric core internal overheating or the electric core temperature is too low to cause unable to work, can make battery work in high temperature, low temperature environment, improve battery rate performance and cycle life.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a prismatic battery with rapid temperature control and an energy storage device. Background Technology

[0002] With energy and environmental issues becoming increasingly severe, countries around the world are increasing their research and development efforts in new energy vehicles. As a crucial component of electric vehicles, the research on power batteries is imperative.

[0003] The existing 4680 cylindrical battery has higher energy density and larger capacity than the conventional 18650 battery. The cell height can reach 80mm and the diameter is 46mm. The cell adopts a petal-shaped full-tab structure, which greatly reduces the internal resistance of the battery. The cell is rolled up and stacked vertically along the height of the battery, with tabs at both ends. However, this type of battery has the following problems: there is space inside the wound cell for the battery to be squeezed, which can deform the cell during cycling. In addition, the internal heat dissipation performance of cylindrical batteries is poor, and the center temperature is too high or too low. Uneven temperature affects the battery cycle life. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a prismatic battery and energy storage device with rapid temperature control. By inserting a liquid-conducting core rod inside the battery cell to restrain cell expansion, the rigidity of the cell is strengthened, preventing deformation during later cycles and facilitating long-term cycling. Furthermore, the design of combining a rapidly cooling or heating shell with the internal core rod uniformizes the cell temperature, ensuring consistent temperature throughout the cell. This prevents overheating and degradation inside the cell or underheating that could render it inoperable. The battery can operate in both high and low temperature environments, improving its rate performance and cycle life.

[0005] To achieve the above objectives, in a first aspect, this utility model provides a prismatic battery with rapid temperature control, comprising: a battery cell, a liquid-conducting rod, a casing, a positive electrode liquid collecting cover assembly, a positive electrode current collector, a negative electrode current collector, and a bottom liquid collecting cover; wherein,

[0006] The battery cell is a cylindrical structure formed by winding a positive electrode, a negative electrode, and a separator.

[0007] The liquid-conducting core rod passes through the battery cell and has a first liquid flow channel inside, through which the liquid inside the first liquid flow channel heats or cools the inside of the battery cell;

[0008] The housing, which is fitted over the battery cell, includes an outer shell and an inner shell. The outer shell is a polygonal prism, and the inner shell is a cylindrical shape and is disposed inside the outer shell. A second liquid flow channel is formed between the inner shell and the outer shell, through which liquid is placed to heat or cool the outside of the battery cell.

[0009] The positive current collector and the negative current collector are respectively disposed on both sides of the battery cell and fixed inside the outer casing;

[0010] The positive electrode liquid collecting cover plate assembly is disposed on the outside of the positive electrode current collector and fixed to one end of the outer shell. At the same time, the bottom of the positive electrode liquid collecting cover plate assembly is provided with a positive electrode sealing ring, which seals with one end of the inner shell.

[0011] The bottom liquid collection cover is located on the outside of the negative electrode collector plate and fixed to the other end of the outer shell. At the same time, the bottom of the bottom liquid collection cover is provided with a negative electrode sealing ring, which seals the other end of the inner shell.

[0012] Both the positive electrode liquid collecting cover assembly and the bottom liquid collecting cover are provided with liquid collecting channels, which are connected to the second liquid flow channel.

[0013] Preferably, the positive electrode liquid collecting cover assembly includes, from the inside out, a core rod fixing platform, a first insulating assembly, a connector, a second insulating assembly, and a cover body; wherein,

[0014] The core rod fixing platform is annular, with the liquid guiding core rod fixed in the middle;

[0015] The first insulating component is sleeved on the outside of the mandrel fixing platform;

[0016] The connector is sleeved on the outside of the first insulating component, the positive electrode post is fixed on the connector, the connector has an insertion groove inside, and the positive current collector is inserted into the insertion groove of the connector.

[0017] The second insulating component is sleeved on the outside of the connector;

[0018] The cover plate body is a polygonal structure adapted to the outer shell, with an opening in the middle, through which it is sleeved onto the second insulating component.

[0019] More preferably, the cover plate body has a thickness of 0.5-4mm and a hexagonal shape;

[0020] The thickness of the connector is 0.2mm-2mm, and the width of the insertion slot is 0.5-3mm;

[0021] The length of the liquid-conducting core rod is 10mm-2000mm; the outer diameter is 3mm-200mm; and the inner diameter is 0.2mm-20mm.

[0022] The battery cell has a diameter of 10mm-400mm and a height of 10mm-2000mm.

[0023] More preferably, both the positive electrode and the negative electrode include a current collector layer and an active material layer;

[0024] Both sides of the current collector layer are coated with active material layers, and there are areas of the current collector layer that are not coated with active material, which are called tabs;

[0025] The positive electrode tabs of the positive electrode sheet and the negative electrode tabs of the negative electrode sheet are located at both ends of the cell during the stacking arrangement. The tabs are designed in a gradient. During the winding process, the height of the tabs gradually increases from small to large. There are no tabs near the core rod, and the outer tabs are stepped.

[0026] More preferably, the positive current collector is provided with a tab welding position for welding to the positive electrode tab;

[0027] The negative electrode current collector is provided with a tab welding position for welding to the negative electrode tab. The edge of the negative electrode current collector protrudes and is connected to the shell by welding or riveting.

[0028] The positive electrode liquid collecting cover assembly is welded or riveted to the positive electrode collector plate; the negative electrode collector plate and the bottom liquid collecting cover are welded or riveted.

[0029] More preferably, the perimeter of the core rod's outer cross-section is 20-600 mm, the ratio of the perimeter of the core rod's outer cross-section to that of the battery cell's outer cross-section is 1.1-10, and the ratio of the surface area of ​​the through-hole inside the core rod to the battery cell's capacity is 0.5-5 cm². 2 / Ah, the ratio of the length of the core rod to the length of the cell is 1-1.5, and the ratio of the length of the core rod to the length of the battery is 0.9-1.5.

[0030] More preferably, the cross-section of the outer shell is an equilateral triangle, a regular hexagon, or a regular octagon.

[0031] Preferably, the positive current collector is circular with a terminal knob in the center;

[0032] The diameter of the positive current collector is 10mm-400mm, and the thickness is 0.2mm-1.8mm;

[0033] The thickness of the electrode button is 0.5mm-3mm, and the height is 1mm-10mm.

[0034] Preferably, the negative electrode current collector has a polygonal structure with a longest diagonal length of 10-400mm, a shortest diagonal length of 10-400mm, and a thickness of 0.2mm-1.8mm.

[0035] Secondly, this application also provides an energy storage device comprising the rapidly temperature-controlled prismatic battery described in the first aspect above, the energy storage device comprising a battery pack or a battery module.

[0036] This utility model provides a prismatic battery and energy storage device with rapid temperature control. By inserting a liquid-conducting core rod inside the battery cell to restrain the expansion of the cell, the rigidity of the cell is strengthened, and deformation during later cycles is avoided, which is beneficial for long cycles. Furthermore, by combining the rapidly cooling or heating shell with the built-in core rod, the cell temperature is uniform, making the temperature of the cell consistent inside and out. This avoids overheating and deterioration inside the cell or underheating and inoperability, allowing the battery to operate in high and low temperature environments, thereby improving the battery's rate performance and cycle life. Attached Figure Description

[0037] Figure 1 A schematic diagram of a prism battery structure for rapid temperature control is provided for an embodiment of this utility model;

[0038] Figure 2 A schematic diagram of a rapidly temperature-controlled prism battery explosion is provided for an embodiment of this utility model;

[0039] Figure 3 A schematic diagram of a battery cell structure provided for an embodiment of this utility model;

[0040] Figure 4 A schematic diagram of a liquid-conducting mandrel structure provided for an embodiment of this utility model;

[0041] Figure 5 A schematic diagram of a shell structure provided for an embodiment of this utility model;

[0042] Figure 6 A schematic cross-sectional view of the shell provided in an embodiment of this utility model;

[0043] Figure 7 A schematic diagram of a positive current collector structure provided for an embodiment of this utility model;

[0044] Figure 8 A schematic cross-sectional view of a positive current collector provided for an embodiment of this utility model;

[0045] Figure 9 A cross-sectional schematic diagram of a negative electrode current collector provided for an embodiment of this utility model;

[0046] Figure 10 A schematic diagram of a positive electrode liquid collecting cover assembly provided in an embodiment of this utility model;

[0047] Figure 11 An exploded view of a positive electrode liquid collecting cover assembly provided for an embodiment of this utility model;

[0048] Figure 12 A cross-sectional schematic diagram of a positive electrode liquid collecting cover assembly provided for an embodiment of this utility model;

[0049] Figure 13 A cross-sectional schematic diagram of a prism battery with rapid temperature control is provided for an embodiment of this utility model;

[0050] Figure 14 for Figure 13 A magnified view of a portion of the image;

[0051] Figure 15 A schematic diagram of a prism battery pack with rapid temperature control provided for an embodiment of this utility model;

[0052] in:

[0053] 1. Battery cell; 2. Liquid guide rod; 21. First liquid flow channel; 3. Housing; 31. Outer shell; 32. Inner shell; 33. Second liquid flow channel; 4. Positive electrode liquid collection cover assembly; 41. Rod fixing platform; 42. First insulation assembly; 43. Connector; 431. Insertion groove; 44. Second insulation assembly; 45. Cover body; 451. Liquid collection channel; 46. Positive electrode sealing ring; 5. Positive electrode current collector; 51. Electrode button; 6. Negative electrode current collector; 7. Bottom liquid collection cover; 71. Negative electrode sealing ring. Detailed Implementation

[0054] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0055] The prismatic battery with rapid temperature control provided in this embodiment of the utility model is an electrochemical battery, which can be a primary battery or a secondary battery. Primary batteries include zinc-manganese batteries, zinc-plated batteries, lithium iron batteries, etc., and secondary batteries include lithium-ion batteries, lithium metal batteries, sodium-ion batteries, aluminum-ion batteries, magnesium-ion batteries, etc., and are not limited to specific types. Furthermore, the battery in this application is not limited to liquid or solid batteries.

[0056] Figure 1 This is a schematic diagram of a prism battery structure for rapid temperature control provided by an embodiment of the present invention. Figure 2 A schematic diagram of a rapidly temperature-controlled prism battery explosion is provided for an embodiment of this utility model, combined with... Figure 1 and Figure 2 As shown in the figure, the prismatic battery with rapid temperature control provided by this utility model embodiment includes a cell 1, a liquid guiding core rod 2, a shell 3, a positive electrode liquid collecting cover plate assembly 4, a positive electrode current collector 5, a negative electrode current collector 6, and a bottom liquid collecting cover plate 7. The components are described in detail below.

[0057] Cell 1, combined Figures 1 to 3As shown, a cylindrical structure is formed by winding a positive electrode, a negative electrode, and a separator. The cylinder has a central through hole. Specifically, the cell 1 is obtained by winding and shaping the three components through a stacked arrangement. The stacked structure is separator-positive (negative) electrode-separator-negative (positive) electrode. It can be understood that both the positive and negative electrodes include a current collector layer and an active material layer. Both sides of the current collector layer are coated with an active material layer (which may be doped with inorganic solid electrolyte). There is also an area in the current collector layer that is not coated with active material. This area is the tab. The tab can be cut according to a certain pattern or all of them can be retained. The positive tab of the positive electrode and the negative tab of the negative electrode are located at both ends of the cell 1 during the stacked arrangement. The height of the entire tab is preferably 3-30mm, and the width of a single tab is preferably 1-10mm. The tabs are designed in a gradient. During the winding process, the height of the tabs gradually increases from small to large. There are no tabs near the core rod, and the outer tabs are stepped. In this embodiment, the diameter of cell 1 is 10mm-400mm and the height is 10mm-2000mm.

[0058] The design of cell 1 in this application improves the overall energy density of the PACK from a system integration perspective. In this embodiment, the specific materials of each component of cell 1 are given as follows:

[0059] Cathode: Cathode materials include, but are not limited to, one or more of lithium iron phosphate, lithium iron manganese phosphate, lithium cobalt oxide, lithium manganese oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium-rich layered oxide, lithium nickel manganese oxide, lithium titanate, fluorinated graphite, MnO2, FeS2, FeF3, S, and sulfurized polyacrylonitrile.

[0060] Negative electrode: Negative electrode materials include, but are not limited to, Li4Ti5O 12 Highly stable pyrolytic graphite, artificial graphite, natural graphite, graphitized carbon fiber, graphitized mesophase carbon microspheres, hard carbon, soft carbon, carbon nanotubes, graphene and graphene composite anodes, silicon anodes, silicon suboxide, silicon-carbon composite anodes, lithium metal anodes, lithium alloys, composite lithium metal anodes, tin-based anodes, tin oxide anodes, and one or more of MoS2.

[0061] Electrolytes: These mainly include all-solid electrolytes and mixed solid-liquid electrolytes, and liquid electrolytes can also be used. The solid components in all-solid electrolytes and mixed solid-liquid electrolytes include, but are not limited to, perovskite type (lithium lanthanum titanium oxide), garnet type (lithium lanthanum zirconium oxide and its doping), NAS ICON type (lithium zirconium aluminum phosphate, lithium germanium aluminum phosphate), thin film type (Li PON) and other oxide solid electrolytes; glass / ceramic type (lithium silicon phosphorus sulfur, lithium phosphorus sulfur, lithium germanium phosphorus sulfur), halogen-doped type (lithium phosphorus sulfur chloride, lithium antimony sulfur iodine) and other sulfide solid electrolytes; lithium yttrium chloride, lithium indium chloride, lithium zirconium chloride, lithium zirconium bromide and other halide solid electrolytes; polyethylene oxide, polycarbonate, polyacrylonitrile, polyurethane, polyacrylate, polyvinylidene fluoride and other polymer solid electrolytes; and composite solid electrolytes of oxides / sulfides / halides and polymers. Liquid electrolytes include, but are not limited to, lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, and other liquid electrolyte materials; liquid electrolyte solvents include, but are not limited to, ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), etc.

[0062] Other: mainly includes key auxiliary materials such as ion conductor membranes, positive electrode current collectors, negative electrode current collectors, adhesives, conductive agents, additives, interface layers, and tabs.

[0063] Liquid guiding core rod 2, combined with Figures 1 to 4 As shown, a central through-hole is provided in the battery cell 1, and a first liquid flow channel 21 is provided inside, running through both ends of the cell. The liquid inside the first liquid flow channel 21 heats or cools the inside of the battery cell 1, allowing the battery to operate in high or low temperature environments. It can be understood that the liquid inside refers to a solution with heat exchange capacity. The liquid guide rod 2 has a liquid flow hole inside, which forms the aforementioned first liquid flow channel 21. By placing the liquid guide rod 2 inside the battery cell 1, the problem of excessively high or low internal temperature of the circular battery cell is solved. Furthermore, by implanting the rod support structure inside the battery cell 1, the expansion of the battery cell 1 can be restrained, the rigidity of the battery cell can be strengthened, deformation during later cycles can be avoided, the cycle life of the battery can be improved, and long-cycle life can be promoted. In this embodiment, the length of the liquid-conducting core rod 2 is 10mm-2000mm, the outer diameter is 3mm-200mm, and the inner diameter (diameter of the core rod through hole) is 0.2mm-20mm. Furthermore, this embodiment also provides preferred options for other core rod dimensions: the perimeter of the core rod's outer cross-section is limited to 20-600mm, the ratio of the core rod's outer cross-section perimeter to the battery cell's outer cross-section perimeter is 1.1-10, and the ratio of the surface area of ​​the core rod's internal through hole to the battery cell's capacity is 0.5-5cm². 2 / Ah, the relationship between battery length and core rod size is as follows: the length ratio of core rod to cell 1 is 1-1.5, and the length ratio of core rod to battery is 0.9-1.5. In the preferred embodiment, the length ratio of battery to cell 1 is 1-1.5.

[0064] Shell 3, combined Figures 1 to 6 As shown, the casing 3, fitted over the battery cell 1, includes an outer shell 31 and an inner shell 32. The outer shell 31 is a polygonal prism, including but not limited to equilateral triangles, regular hexagons, and regular octagons. That is, the cross-section of the outer shell 31 is an equilateral triangle, regular hexagon, or regular octagon. In this embodiment, a regular hexagon is preferred. The prism structure improves the packing efficiency, while the straight-edge structure reduces the packing difficulty, lowers the battery manufacturing difficulty, and reduces manufacturing costs. The inner shell 32 is cylindrical and is disposed inside the outer shell 31. A second liquid flow channel 33 is formed between the inner shell 32 and the outer shell 31. The liquid inside the second liquid flow channel 33 heats or cools the outside of the battery cell 1, thereby improving the temperature control efficiency of the battery cell 1. The built-in liquid here refers to a solution with heat exchange capacity, which can be the same as or different from the liquid inside the liquid-conducting core rod 2, depending on the application scenario. By fitting a circular inner shell 32 inside the prism-shaped outer shell 31, which differs in size from the outer shell 31, the problem of increased electrode gap caused by the lack of restraint inside the irregularly shaped battery cell shell is solved. In this example, the casing 3 is formed by extrusion profile, and the material can be one or more of the following metal materials: aluminum alloy, steel, copper alloy, magnesium alloy, etc. The cross-section of the outer casing 31 is preferably a regular hexagon, with a side length of 10mm-300mm and a shortest diagonal distance of 10mm-400mm. The thickness of the outer casing 31 is 0.2mm-8mm, and the height of the outer casing 31 is 10mm-2000mm. The thickness of the inner casing 32 is 0.2mm-8mm, and the thickness ratio of the inner casing 32 to the outer casing 31 is 0.5-1. The distance between the edge of the inner casing 32 and the edge of the outer casing 31 is 1mm-10mm. The length of the casing 3 can be arbitrarily cut according to the capacity configuration requirements of the battery cell 1. This application, through the concept of combining a rapidly cooling or heating casing with an internal core rod, uniformizes the temperature of the battery cell 1, making the temperature of the battery cell 1 consistent throughout, avoiding overheating and deterioration inside the battery cell 1 or undercooling and inoperability, thereby improving the battery rate performance and cycle life.

[0065] Both the positive current collector 5 and the negative current collector 6 are hollow current collectors formed by stamping, respectively disposed on both sides of the battery cell 1 and fixed inside the outer casing 31. Specifically, in conjunction with... Figures 1 to 9 As shown, it will be introduced.

[0066] The positive current collector 5 is circular and is used to concentrate current to the terminal of cell 1, saving internal space. The positive current collector 5 has a tab welding position for welding to the positive electrode tab. This welding includes, but is not limited to, ultrasonic welding, microwave welding, or laser welding. In this embodiment, the diameter of the positive current collector 5 is 10mm-400mm, and the thickness is 0.2mm-1.8mm. A terminal button 51 is located in the center of the positive current collector 5, with a thickness of 0.5mm-3mm and a height of 1mm-10mm. The hollow top design of the positive current collector 5 reduces internal space waste and increases battery energy density.

[0067] The negative electrode current collector 6 has a polygonal structure that matches the shape of the housing 3. The negative electrode current collector 6 is preferably made of nickel-plated copper. It has tab welding positions for welding to the negative electrode tabs. The edges of the negative electrode current collector 6 protrude and are connected to the housing 3 by welding or riveting. The negative electrode current collector 6 directly connects the current to the battery housing 3, saving internal space. The welding methods include, but are not limited to, ultrasonic welding, microwave welding, or laser welding. In this embodiment, the length (longest diagonal length) of the negative electrode current collector 6 is 10-400 mm, the width (shortest diagonal length) is 10-400 mm, and the thickness is 0.2 mm-1.8 mm.

[0068] The positive electrode liquid collecting cover assembly 4 and the bottom liquid collecting cover 7 are respectively disposed on the outer sides of the positive electrode current collector 5 and the negative electrode current collector 6, and fixed to both ends of the outer casing 31. In this embodiment, the positive electrode liquid collecting cover assembly 4 and the positive electrode current collector 5 are welded or riveted together. The welding includes, but is not limited to, ultrasonic welding, microwave welding, or laser welding. The negative electrode current collector 6 and the bottom liquid collecting cover 7 are welded or riveted together. Figures 1 to 12 As shown, they will be introduced separately.

[0069] The positive electrode liquid collecting cover assembly 4 is fixed to the outside of the positive electrode collector plate 5 and to one end of the outer shell 31. Simultaneously, a positive electrode sealing ring 46, including but not limited to a rubber sealing ring, is provided at the bottom of the positive electrode liquid collecting cover assembly 4. The positive electrode sealing ring 46 seals one end of the inner shell 32 and is laser-welded to the outer shell 31. The positive electrode liquid collecting cover assembly 4, from the inside out, includes a core rod fixing platform 41, a first insulating component 42, a connector 43, a second insulating component 44, and a cover body 45. The core rod fixing platform 41 is annular, with a liquid-conducting core rod 2 fixed in the center, preferably fixed by welding. The first insulating component 42 is sleeved on the outside of the core rod fixing platform 41 to ensure insulation between the positive electrode post and the core rod fixing platform 41. The connector 43, sleeved on the outside of the first insulating component 42, is the welding position for the positive electrode post and the positive current collector 5. The positive electrode post is fixedly fastened to the connector 43. The liquid guide rod 2 can directly cool or heat the post to prevent the post temperature from being too high or too low. The connector 43 has an insertion groove 431 inside, into which the positive current collector 5 is inserted. After insertion, it is welded by laser penetration welding. In this example, the thickness of the connector 43 is 0.2mm-2mm, and the width of the insertion groove 431 is 0.5-3mm. The second insulating component 44, sleeved on the outside of the connector 43, ensures that the cover plate is insulated from the positive electrode post. The thickness of the lower plastic of the second insulating component 44 is 0.2-2mm, and the distance between the lower plastic and the edge of the cover plate body 45 is 0-2mm. The cover plate body 45 is a polygonal structure adapted to the outer shell 31, with an opening in the middle, through which it is sleeved onto the second insulating component 44. In this embodiment, the cover plate body 45 has a thickness of 0.5-4mm, a side length of 10mm-300mm, a minimum diagonal distance of 10mm-400mm, and an included angle of 60°-150° between adjacent sides. The cover plate body 45 is preferably hexagonal. When the battery is a liquid battery, the cover plate body 45 is provided with an injection hole for injecting and replacing electrolyte. The diameter of the injection hole is preferably 1-10mm. When the battery is a solid-state battery, this injection hole is not required.

[0070] The bottom liquid collection cover 7 is fixed to the outside of the negative electrode collector plate 6 and to the other end of the outer shell 31. Simultaneously, a negative electrode sealing ring 71, including but not limited to a rubber sealing ring, is provided at the bottom of the bottom liquid collection cover 7. The negative electrode sealing ring 71 seals the other end of the inner shell 32 and is laser-welded to the outer shell 31. The bottom liquid collection cover 7 has a polygonal structure adapted to the outer shell 31, preferably a hexagonal structure.

[0071] Combination Figure 13 and Figure 14As shown, the internal liquid flow direction of the cell 1 is clearly defined. Both the positive electrode liquid collecting cover assembly 4 and the bottom liquid collecting cover 7 are provided with liquid collecting channels 451. The liquid collecting channels 451 are connected to the second liquid flow channel 33 between the outer shell 31 and the inner shell 32. The second liquid flow channel 33 can be connected to the first liquid flow channel 21 of the liquid guiding core rod 2 through external components. Thus, the temperature of the cell 1 is uniform through the dual channels inside and outside the cell 1, so that the temperature of the cell 1 is consistent inside and outside. This avoids the cell 1 from overheating and deteriorating or from being too cold and unable to work. It allows the battery to work and operate in high temperature and low temperature environments, improving the battery rate performance and cycle life.

[0072] Furthermore, this application also provides an energy storage device comprising the aforementioned rapidly temperature-controlled prismatic battery. The energy storage device includes a battery pack or battery module, which is composed of multiple prismatic batteries. When prismatic batteries are grouped together, space utilization is high, resulting in modules and battery packs with higher energy density. Specifically, as shown... Figure 15 As shown.

[0073] This utility model provides a prismatic battery and energy storage device with rapid temperature control. By inserting a liquid-conducting core rod inside the battery cell to restrain the expansion of the cell, the rigidity of the cell is strengthened, and deformation during later cycles is avoided, which is beneficial for long cycles. Furthermore, by combining the rapidly cooling or heating shell with the built-in core rod, the cell temperature is uniform, making the temperature of the cell consistent inside and out. This avoids overheating and deterioration inside the cell or underheating and inoperability, allowing the battery to operate in high and low temperature environments, thereby improving the battery's rate performance and cycle life.

[0074] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0075] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0076] In the description herein, the terms "a specific embodiment," "some embodiments," "one embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0077] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A prismatic battery with rapid temperature control, characterized in that, The rapidly temperature-controlled prismatic battery includes a cell, a liquid-conducting rod, a casing, a positive electrode liquid collector cover assembly, a positive electrode current collector, a negative electrode current collector, and a bottom liquid collector cover; wherein... The battery cell is a cylindrical structure formed by winding a positive electrode, a negative electrode, and a separator. The liquid-conducting core rod passes through the battery cell and has a first liquid flow channel inside, through which the liquid inside the first liquid flow channel heats or cools the inside of the battery cell; The housing, which is fitted over the battery cell, includes an outer shell and an inner shell. The outer shell is a polygonal prism, and the inner shell is a cylindrical shape and is disposed inside the outer shell. A second liquid flow channel is formed between the inner shell and the outer shell, through which liquid is placed to heat or cool the outside of the battery cell. The positive current collector and the negative current collector are respectively disposed on both sides of the battery cell and fixed inside the outer casing; The positive electrode liquid collecting cover plate assembly is disposed on the outside of the positive electrode current collector and fixed to one end of the outer shell. At the same time, the bottom of the positive electrode liquid collecting cover plate assembly is provided with a positive electrode sealing ring, which seals with one end of the inner shell. The bottom liquid collection cover is located on the outside of the negative electrode collector plate and fixed to the other end of the outer shell. At the same time, the bottom of the bottom liquid collection cover is provided with a negative electrode sealing ring, which seals the other end of the inner shell. Both the positive electrode liquid collecting cover assembly and the bottom liquid collecting cover are provided with liquid collecting channels, which are connected to the second liquid flow channel.

2. The prismatic battery with rapid temperature control according to claim 1, characterized in that, The positive electrode liquid collecting cover assembly includes, from the inside out, a core rod fixing platform, a first insulating assembly, a connector, a second insulating assembly, and a cover body; wherein... The core rod fixing platform is annular, with the liquid guiding core rod fixed in the middle; The first insulating component is sleeved on the outside of the mandrel fixing platform; The connector is sleeved on the outside of the first insulating component, the positive electrode post is fixed on the connector, the connector has an insertion groove inside, and the positive current collector is inserted into the insertion groove of the connector. The second insulating component is sleeved on the outside of the connector; The cover plate body is a polygonal structure adapted to the outer shell, with an opening in the middle, through which it is sleeved onto the second insulating component.

3. The rapidly temperature-controlled prismatic battery according to claim 2, characterized in that, The cover plate has a thickness of 0.5-4mm and a hexagonal shape. The thickness of the connector is 0.2mm-2mm, and the width of the insertion slot is 0.5-3mm; The length of the liquid-conducting core rod is 10mm-2000mm; the outer diameter is 3mm-200mm; and the inner diameter is 0.2mm-20mm. The battery cell has a diameter of 10mm-400mm and a height of 10mm-2000mm.

4. The prismatic battery with rapid temperature control according to claim 1, characterized in that, Both the positive electrode and the negative electrode include a current collector layer and an active material layer; Both sides of the current collector layer are coated with active material layers, and there are areas of the current collector layer that are not coated with active material, which are called tabs; The positive electrode tabs of the positive electrode sheet and the negative electrode tabs of the negative electrode sheet are located at both ends of the cell during the stacking arrangement. The tabs are designed in a gradient. During the winding process, the height of the tabs gradually increases from small to large. There are no tabs near the core rod, and the outer tabs are stepped.

5. The rapidly temperature-controlled prismatic battery according to claim 4, characterized in that, The positive current collector is provided with a tab welding position for welding to the positive electrode tab; The negative electrode current collector is provided with a tab welding position for welding to the negative electrode tab. The edge of the negative electrode current collector protrudes and is connected to the shell by welding or riveting. The positive electrode liquid collecting cover assembly is welded or riveted to the positive electrode collector plate; the negative electrode collector plate and the bottom liquid collecting cover are welded or riveted.

6. The rapidly temperature-controlled prismatic battery according to any one of claims 1-5, characterized in that, The perimeter of the core rod's outer cross-section is 20-600 mm, the ratio of the core rod's outer cross-section perimeter to the cell's outer cross-section perimeter is 1.1-10, and the ratio of the surface area of ​​the through-hole inside the core rod to the cell's capacity is 0.5-5 cm². 2 / Ah, the ratio of the length of the core rod to the length of the cell is 1-1.5, and the ratio of the length of the core rod to the length of the battery is 0.9-1.

5.

7. The rapidly temperature-controlled prismatic battery according to any one of claims 1-5, characterized in that, The cross-section of the outer shell is an equilateral triangle, a regular hexagon, or a regular octagon.

8. The rapidly temperature-controlled prismatic battery according to claim 7, characterized in that, The side length of the regular hexagon is 10mm-300mm, and the shortest diagonal distance is 10mm-400mm; The outer shell has a height of 10mm-2000mm; the outer shell has a thickness of 0.2mm-8mm; the inner shell has a thickness of 0.2mm-8mm; and the thickness ratio of the inner shell to the outer shell is 0.5-1. The distance between the inner shell and the outer shell is 1mm-10mm.

9. The rapidly temperature-controlled prismatic battery according to any one of claims 1-5, characterized in that, The positive current collector is circular, with a terminal knob in the center; The diameter of the positive current collector is 10mm-400mm, and the thickness is 0.2mm-1.8mm; The thickness of the electrode button is 0.5mm-3mm, and the height is 1mm-10mm; The negative electrode current collector has a polygonal structure with a longest diagonal length of 10-400mm, a shortest diagonal length of 10-400mm, and a thickness of 0.2mm-1.8mm.

10. An energy storage device comprising a prismatic battery with rapid temperature control as described in any one of claims 1-9, characterized in that, The energy storage device includes a battery pack or a battery module.

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