Battery cell, battery pack and electric device

Abstract

The application relates to the technical field of batteries, and relates to a battery monomer, a battery pack and a power utilization device. The battery monomer comprises a battery shell and a pole core structure; the battery shell is internally provided with an accommodating cavity, and the battery shell comprises two first side walls oppositely arranged in a first direction and two second side walls oppositely arranged in a second direction; the area of the second side wall is larger than that of the first side wall, and the first direction and the second direction are arranged at an included angle; the second side wall is provided with a through groove communicated with the accommodating cavity; the pole core structure is accommodated in the accommodating cavity; the pole core structure comprises a first pole lug and a second pole lug, and the first pole lug and the second pole lug are respectively arranged outside the battery shell from the through groove. The battery monomer provided in the embodiment is improved by improving the layout mode of the first pole lug and the second pole lug in the pole core structure relative to the battery shell, so that the overcurrent capacity of the battery monomer is effectively improved, and the design requirements of a high-energy-density fast-charging battery are met.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery pack and electrical device. Background Technology

[0002] With the rapid development of battery technology, fast charging technology has become a key factor in market competition. However, the design of existing battery cells still has many problems in improving charging efficiency. For example, the transfer path of lithium ions between the positive and negative electrodes is long, the internal resistance of the battery is relatively high, and the current-carrying area of ​​the tabs is small after they are led out, resulting in poor battery performance. Summary of the Invention

[0003] This application provides a battery cell, a battery pack, and an electrical device to solve the problem in existing fast charging technologies where the internal resistance of the battery increases and the overcurrent capacity of the battery decreases due to the excessively long transfer path of lithium ions between the positive and negative electrodes.

[0004] The first aspect of this application provides a battery cell, comprising:

[0005] A battery casing has an internal receiving cavity, and the battery casing includes two first sidewalls arranged opposite each other in a first direction and two second sidewalls arranged opposite each other in a second direction. The area of ​​the second sidewalls is larger than the area of ​​the first sidewalls, and the first direction and the second direction form an angle. The second sidewalls have through slots communicating with the receiving cavity.

[0006] The electrode core structure is housed within the receiving cavity; the electrode core structure includes a first electrode tab and a second electrode tab, which are respectively inserted through the through groove on the outside of the battery casing.

[0007] In one possible implementation, the battery housing further includes a third sidewall disposed opposite to the second sidewall in a third direction, the area of ​​the third sidewall being larger than that of the second sidewall, and the third direction being disposed at an angle to the first direction and the second direction, respectively.

[0008] In one possible implementation, each of the second sidewalls is provided with a plurality of through slots, the plurality of through slots are arranged in parallel and spaced apart, the number of pole core structures is plurality, and the plurality of pole core structures are arranged in a one-to-one correspondence with the plurality of through slots.

[0009] In one possible implementation, the through slot includes a first through slot and a second through slot, and the first through slot and the second through slot are respectively disposed on two opposite second sidewalls in the second direction. The first electrode tab passes through the first through slot to the outside of the battery housing, and the second electrode tab passes through the second through slot to the outside of the battery housing.

[0010] In one possible implementation, there are multiple electrode core structures, and the multiple electrode core structures are stacked; a lithium storage layer is disposed between two adjacent electrode core structures.

[0011] In one possible implementation, the lithium storage layer comprises a solid electrolyte.

[0012] In one possible implementation, the solid electrolyte comprises a polymer solid electrolyte or an inorganic-organic composite solid electrolyte.

[0013] In one possible implementation, the polymer solid electrolyte comprises a mixture of a high molecular weight polymer and a lithium salt material.

[0014] In one possible implementation, the inorganic-organic composite solid electrolyte comprises a mixture of polymer, lithium salt material, and inorganic filler.

[0015] In one possible implementation, the inorganic-organic composite solid electrolyte further includes a lithium replenishing agent, wherein the mass ratio of the lithium replenishing agent to the inorganic filler is (1-5):(2-5).

[0016] In one possible implementation, the solid electrolyte also includes a lithium replenishing agent.

[0017] In one possible implementation, the core structure has a dimension L in the first direction, a dimension H in the second direction, and a dimension D in the third direction. The first direction is the length direction of the core structure, the second direction is the width direction of the core structure, and the third direction is the thickness direction of the core structure, satisfying the following relationships: 300mm≤L≤1100mm, 60mm≤H≤160mm, 10mm≤D≤40mm.

[0018] In one possible implementation, the battery housing includes a housing body and a cover plate, the housing body forming the first sidewall, the cover plate being connected to the opening of the housing body and forming the second sidewall, the cover plate having the through groove and being connected to the first tab and / or the second tab.

[0019] A second aspect of this application provides a battery pack, comprising:

[0020] The outer shell of the package; and

[0021] A plurality of battery cells as described in any of the above, wherein the plurality of battery cells are electrically connected and housed within the outer casing of the package.

[0022] In one possible implementation, a plurality of the battery cells are stacked within the housing, respectively, along the width direction and / or the thickness direction of the housing.

[0023] In one possible implementation, the battery pack further includes a battery assembly comprising a plurality of battery cells located on the same layer. The battery pack also includes a moving mechanism, through which the battery assembly is slidably connected to the outer shell of the pack, and the moving mechanism is capable of moving the battery assembly outside the outer shell of the pack.

[0024] In one possible implementation, the moving mechanism includes a support and a connector, the support being slidably connected to the outer shell of the pack via the connector, and the support being used to support the battery cell, the support being disposed below the battery cell along the thickness direction of the battery pack.

[0025] In one possible implementation, the battery pack further includes a cooling plate attached to the top of the individual battery cells along the thickness direction of the battery pack.

[0026] In one possible implementation, the battery pack further includes a crimping protrusion located between two adjacent battery cells and crimped against the outer wall of at least one battery cell.

[0027] A third aspect of this application provides an electrical device comprising a battery pack as described in any of the preceding claims, or a battery cell as described in any of the preceding claims.

[0028] Implementing the embodiments of this application has the following beneficial effects:

[0029] The battery cell provided in this embodiment improves the current carrying capacity of the battery cell by improving the layout of the first and second tabs relative to the battery casing in the core structure, so as to meet the design requirements of high energy density fast charging battery.

[0030] Compared to the existing battery design with positive and negative tabs extending along a first direction, in this embodiment, the first and second tabs of the battery cell are respectively located on the second sidewall. As a result, the effective external overcurrent area of ​​the first and second tabs of the battery cell is increased compared to the existing battery design. This improvement significantly improves the uniformity of the temperature field during high-rate charging and reduces the temperature difference between the two ends of the tabs, thereby effectively reducing the risk of battery thermal runaway. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A perspective view of a battery cell in an embodiment of the present invention is shown;

[0033] Figure 2 A top view of the core structure in an embodiment of the present invention is shown;

[0034] Figure 3 A partial structural schematic diagram of a battery cell in an embodiment of the present invention is shown;

[0035] Figure 4 A schematic diagram of the layout of the electrode core structure in a battery cell is shown in an embodiment of the present invention;

[0036] Figure 5 A front view of the battery pack in an embodiment of the present invention is shown;

[0037] Figure 6 A schematic diagram of the battery pack structure in an embodiment of the present invention is shown;

[0038] Figure label:

[0039] 1-Battery pack;

[0040] 10-cell battery;

[0041] 100 - Battery casing; 110 - Casing body; 111 - First sidewall; 112 - Second sidewall; 1121 - Through slot; 11211 - First through slot; 11212 - Second through slot; 113 - Third sidewall; 120 - Cover plate;

[0042] 200 - Core structure; 210 - First electrode tab; 220 - Second electrode tab;

[0043] 300-Lithium storage layer;

[0044] 20 - Package shell;

[0045] 30 - Moving mechanism; 31 - Supporting component; 32 - Connecting component;

[0046] 40-Refrigeration plate;

[0047] 50-Crim the convex part. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] With the rapid development of battery technology, advancements in battery charging and discharging technology have become a key factor in market competition. However, existing battery cell designs still present numerous challenges in improving charging efficiency. For example, the transfer path of lithium ions between the positive and negative electrodes is long, resulting in high internal resistance. Furthermore, the current-carrying area of ​​the tabs is small after they are led out, which not only limits the battery's current carrying capacity but also poses a challenge to thermal management during high-rate charging, leading to poor battery performance. When the tab design fails to match the current flow path, significant differences in the internal temperature field of the battery will occur during charging, especially at the ends of the tabs and solder joints, further increasing the risk of thermal runaway.

[0050] Based on this, see Figures 1 to 6 As shown, this embodiment of the invention provides a battery cell 10, which includes a battery housing 100 and a core structure 200. The battery housing 100 has an internal cavity and includes two first sidewalls 111 disposed opposite each other in a first direction and two second sidewalls 112 disposed opposite each other in a second direction. The area of ​​the second sidewalls 112 is larger than the area of ​​the first sidewalls 111, and the first direction and the second direction are arranged at an angle. The second sidewalls 112 have a through groove 1121 communicating with the cavity. The core structure 200 is housed in the cavity. The core structure 200 includes a first tab 210 and a second tab 220, which pass through the through groove 1121 and extend to the outside of the battery housing 100.

[0051] In this embodiment, the battery cell 10 is improved by modifying the layout of the first tab 210 and the second tab 220 in the core structure 200 relative to the battery casing 100, thereby effectively improving the overcurrent capacity of the battery cell 10 to meet the design requirements of high energy density fast charging batteries.

[0052] Compared to the existing technology where the battery cell 10 has positive and negative tabs extending along the first direction, in this embodiment, the first tab 210 and the second tab 220 of the battery cell 10 are respectively disposed on the second sidewall 112. Compared to the batteries in the prior art, the effective external area of ​​the first tab 210 and the second tab 220 of the battery cell 10 in this embodiment is also increased. This improvement significantly improves the uniformity of the temperature field during high-rate charging and reduces the temperature difference between the two ends of the tabs, thereby effectively reducing the risk of thermal runaway of the battery cell 10, especially in fast charging scenarios, significantly reducing the risk of thermal runaway of the battery cell 10.

[0053] It should be noted that the X direction in the attached figure can be the first direction, the Y direction can be the second direction, and the Z direction can be the third direction. Specifically, when the battery cell 10 is a long rectangular battery, the first direction can be the length direction of the battery cell 10, the second direction can be the width direction of the battery cell 10, and the third direction can be the thickness direction of the battery cell 10. In this case, the first direction, the second direction, and the third direction are perpendicular to each other. Of course, in some embodiments, when the battery cell 10 is an irregularly shaped battery, any two of the X, Y, and Z directions can be set at an angle, which is not limited here.

[0054] Specifically, see Figure 1 In the embodiment shown, the battery cell 10 can be a rectangular battery. In this case, the core structure 200 can be a stacked core structure or a wound core structure. When the core structure 200 is a wound core structure, the first tab 210 and the second tab 220 can extend from opposite sides of the circumferential direction of the wound core structure.

[0055] like Figures 1 to 3 In the illustrated embodiment, the first tab 210 and the second tab 220 of the core structure 200 are respectively located on opposite sides of the width direction of the battery cell 10. In contrast, batteries in the prior art typically place the positive and negative tabs on opposite sides of the length direction of the battery. This results in an excessively long transfer path for lithium ions between the positive and negative electrodes. Furthermore, after the positive and negative tabs are led out from the battery casing, these tabs have a small width (due to the small size of the battery in the Y direction). As a result, the overall overcurrent area is too small when the tabs are led out, which is not conducive to thermal management control during high-rate charging.

[0056] In this embodiment, the battery cell 10 has a first tab 210 and a second tab 220 respectively disposed on opposite sides of the battery cell 10 in the width direction. At this time, the first tab 210 and the second tab 220 have a large width (i.e. the size of the first tab 210 and the second tab 220 in the X direction), which can significantly increase the current flow area of ​​the first tab 210 and the second tab 220. When applied to high-rate charging, it is convenient to control the heat generation of the battery cell 10.

[0057] In addition, in some embodiments, the second direction can also be the Z direction, and the third direction can be the Y direction. In this case, since the first tab 210 and the second tab 220 are respectively located on opposite sides of the battery cell 10 in the Z direction, the current-passing area of ​​the first tab 210 and the second tab 220 can be further increased. The specific design scheme of the battery cell 10 is determined according to the design scheme of the battery cell 10, and no unique limitation is made here.

[0058] In one embodiment, the battery housing 100 further includes a third sidewall 113 disposed opposite to the second sidewall 112 in a third direction. The area of ​​the third sidewall 113 is larger than that of the second sidewall 112, and the third direction is disposed at an angle to the first direction and the second direction, respectively.

[0059] In this embodiment, the first direction of the battery casing 100 is its length direction, the second direction is its width direction, and the third direction is its thickness direction. Simultaneously, the dimension of the battery casing 100 in the length direction is larger than its dimension in the width direction, and the dimension in the width direction is larger than its dimension in the thickness direction. By providing the through-slot 1121 on the second sidewall 112, this design can be adapted to a blade battery.

[0060] Furthermore, the larger area of ​​the third sidewall 113 effectively disperses heat during battery operation, improves heat exchange efficiency, and reduces the risk of thermal runaway due to overheating inside the battery. Under high-rate charging conditions, this design ensures a uniform temperature field, avoiding performance degradation and safety hazards caused by localized overheating. In addition, the structural design of the battery casing 100 also helps reduce production costs and optimize manufacturing processes in practical applications.

[0061] Specifically, the shape and size of the battery casing 100 can be flexibly adjusted according to actual application requirements. For example, the area of ​​the third sidewall can vary within a certain range to adapt to battery cells with different specifications and performance requirements, without making a single limitation.

[0062] Further, see Figure 3 As shown, each second sidewall 112 is provided with multiple through slots 1121.

[0063] In this embodiment, by providing a through slot 1121 on the battery casing 100 and cooperating with the first tab 210 and the second tab 220, the first tab 210 and the second tab 220 can be conveniently connected to an external circuit after being led out from the battery casing 100, thereby achieving efficient power supply. Specifically, the number of the first tab 210 and the second tab 220 can be one, two, or more, and is not limited to a single number. Setting multiple first tabs 210 and second tabs 220 can effectively improve the current output capability and heat dissipation performance of the battery cell 10, reduce the current density of simultaneous connections, thereby reducing the temperature difference of the tabs and improving safety. Additionally, please refer to... Figure 1 The first tab 210 and the second tab 220 can extend from the through slot 1121 and be welded and fixed to the battery casing 100 to form terminals. At this time, the battery cell 10 can be connected to the external circuit through the terminals, thereby realizing efficient power transmission. Through this design, the terminals not only ensure the connection is firm, but also effectively improve the current conduction efficiency, ensuring the performance stability of the battery cell 10 during high-rate charging.

[0064] The stacking of multiple tabs and their connection to the terminals can significantly enhance the overcurrent capacity of the battery cell 10. Specifically, the number of tabs can be one, two, or more, without limitation. The technical advantage of using multiple tabs is that they can distribute the current load evenly, reduce the current density on the same tab, thereby reducing heat generation and resistance loss, and improving the safety and stability of the entire battery cell 10 under high load conditions. In addition, increasing the contact area between the tabs and the terminals also helps to optimize heat dissipation performance and reduce the risk of thermal runaway.

[0065] In the specific implementation of the electrode posts, welding is currently the most widely used method. Welding can employ processes such as spot welding and laser welding, which provide good connection strength and reliability, and are highly efficient in the production process. Compared to other connection methods, such as mechanical fastener connections, welding has the advantage of eliminating connection loosening problems that may be caused by thermal expansion and contraction, thus enhancing connection stability under long-term use. It should be noted that the specific welding process should be adjusted according to actual design requirements and the working environment of the battery cell 10, and is not limited to a single method here.

[0066] In one embodiment, a plurality of through slots 1121 are arranged in parallel and spaced apart, and there are multiple pole core structures 200, with each pole core structure 200 corresponding to one of the multiple through slots 1121.

[0067] Specifically, multiple through slots 1121 can be spaced apart along the Z direction, allowing tabs of the same polarity to extend from different through slots 1121. This design not only enhances the flexibility of the battery cell 10, but also allows for the formation of multiple terminals according to actual needs. The tabs can be connected or separated to adapt to different design requirements of the battery cell 10.

[0068] Through this structural design, the tabs can extend from the adjacent through slot 1121, thereby effectively shortening the length of the tabs. Shorter tabs not only reduce material usage and production costs, but also reduce resistance loss during current transmission, thus improving overall energy efficiency. Furthermore, the shortened electrode connection path helps reduce heat buildup in the system, enhances heat dissipation performance, and improves the safety of the battery cell 10 under high loads.

[0069] It should be noted that the actual number of through slots 1121 can be two, three, or more, depending on the technical requirements. Insufficient or excessive numbers of through slots 1121 may lead to improper tab arrangement, thus affecting the overall performance and reliability of the battery cell 10. Therefore, properly setting the number and spacing of through slots 1121 is crucial, and no single limitation is made here.

[0070] Specifically, see Figures 2 to 4 As shown, the first tab 210 can be formed by stacking multiple tabs of positive electrode plates, and the second tab 220 can be formed by stacking multiple tabs of negative electrode plates; the through groove 1121 includes a first through groove 11211 and a second through groove 11212, and the first through groove 11211 and the second through groove 11212 are respectively disposed on two opposite second sidewalls 112. The first tab 210 passes through the first through groove 11211 and extends to the outside of the battery housing 100, and the second tab 220 passes through the second through groove 11212 and extends to the outside of the battery housing 100.

[0071] In this embodiment, by opening a first through groove 11211 and a second through groove 11212 on opposite sides of the battery casing 100 in the second direction, when the first tab 210 and the second tab 220 extend from the first through groove 11211 and the second through groove 11212 respectively, a positive electrode post and a negative electrode post can be formed at both ends of the battery cell 10 in the second direction. Furthermore, to ensure the safety and reliability of the battery cell 10, the first tab 210 and the second tab 220 need to be insulated from the battery casing 100 respectively.

[0072] It should be noted that in some embodiments, the first through groove 11211 is provided on one of the second sidewalls, and the number of first through grooves 11211 on this second sidewall can be two or more. When there are multiple first through grooves 11211, the multiple first through grooves 11211 can be arranged parallel and spaced apart along the Y direction, so that multiple first tabs 210 can extend out of the receiving cavity from the multiple first through grooves 11211 respectively. Of course, the number of first through grooves 11211 can also be one, and at least one first tab 210 can extend out of the receiving cavity from the first through groove 11211. Similarly, the second through groove 11212 is provided on the other second sidewall. In some embodiments, the number of second through grooves 11212 can also be multiple, which will not be elaborated here. The number of first through grooves 11211 and second through grooves 11212 is determined according to the design requirements of the battery cell 10, and is not uniquely limited here.

[0073] In addition, in a specific embodiment, the first through groove 11211 and the second through groove 11212 respectively penetrate the two second sidewalls. At this time, the first through groove 11211 and the second through groove 11212 are respectively connected to the outside of the battery housing 100 and the receiving cavity. The first electrode 210 and the second electrode 220 located in the receiving cavity can extend out from the first through groove 11211 and the second through groove 11212 respectively, so that the first electrode 210 and the second electrode 220 can be located on the outside of the battery housing 100 so as to be connected to the external circuit.

[0074] In one embodiment, the battery housing 100 includes a housing body 110 and a cover plate 120. The housing body 110 forms a first sidewall 111, and the cover plate 120 is connected to the opening of the housing body 110 and forms a second sidewall 112. The cover plate 120 has a through groove 1121 and is connected to a first tab 210 and / or a second tab 220.

[0075] In other embodiments, the through slot 1121 may also be provided only on one side of the battery housing 100 in the second direction. In this case, one of the first tabs 210 and the second tab 220 corresponding to the through slot 1121 can extend from the through slot 1121 and be welded to the cover plate 120 to form a terminal post, while the other tab is welded to the battery housing 100, so that the terminal post of the battery cell 10 and the battery housing 100 can serve as the positive and negative terminals of the battery cell 10, respectively. With this design, even when the through slot is provided on only one side, the bipolar output of the battery cell 10 can still be effectively achieved, optimizing the layout and connection method of the battery cell 10 and improving the flexibility and adaptability of the structure.

[0076] It should be noted that the number of the first tab 210 and the second tab 220 can be one, two, or more, and there is no single limitation. In specific implementation, the number and structure of the tabs need to be optimized according to the performance requirements of the battery cell 10 and the specific application scenario to achieve the best performance and economy.

[0077] In one embodiment, the core structure 200 further includes a separator, a positive electrode, and a negative electrode, with the separator disposed between adjacent positive and negative electrode sheets. In this embodiment, by providing a separator between the positive and negative electrode sheets, the separator can effectively prevent direct contact between the positive and negative electrodes, thereby avoiding short circuits and improving the safety and stability of the battery cell 10.

[0078] Further, see Figure 4 As shown, there are multiple electrode core structures 200, and the multiple electrode core structures 200 are stacked; the battery cell 10 also includes a lithium storage layer 300, which is connected between two adjacent electrode core structures 200 respectively.

[0079] In this embodiment, the lithium storage layer 300 can effectively increase the lithium-ion storage capacity of the battery cell 10, thereby improving the performance of the battery cell 10 during charging and discharging and extending its service life. Specifically, the lithium storage layer 300 can be made of flexible polymer solid electrolytes (SPEs) or inorganic-organic composite solid electrolytes (CSEs).

[0080] The lithium storage layer 300 not only enables tight bonding between multiple internal electrode core structures 200, thereby ensuring the overall stability and sealing of the battery cell 10, but also independently serves as a second lithium storage layer inside the battery cell 10, providing additional lithium ions (Li+) for repairing the negative electrode interface (SEI), which is particularly important in the design of high energy density batteries.

[0081] Specifically, the material selection of the lithium storage layer 300 determines the overall performance of the battery cell 10. For example, using a gel electrolyte helps improve ionic conductivity. Specifically, the types of gel electrolytes can include polymer-based gel electrolytes, inorganic gel electrolytes, and organic gel electrolytes, among which polymer-based gel electrolytes are widely used due to their good ionic conductivity and excellent mechanical strength; polymer solid electrolytes can improve the safety and thermal stability of the battery cell 10. It should be noted that the thickness of the lithium storage layer 300 is optimized according to the design requirements of the battery cell 10. If the thickness is too small, it may lead to insufficient lithium storage efficiency; if the thickness is too large, it may reduce ionic conductivity and the overall performance of the battery cell 10.

[0082] In one embodiment, the lithium storage layer 300 includes a solid electrolyte, and the lithium storage layer 300 is formed by solidifying an electrolyte slurry.

[0083] In this embodiment, the solid electrolyte exhibits excellent mechanical strength and good ionic conductivity. The advantage of this hybrid design is that it can improve ionic conductivity while also enhancing the thermal and chemical stability of the battery cell 10.

[0084] Specifically, the solid electrolyte is preferably a flexible structure. This design allows the lithium storage layer 300 to have good flexibility, thus adapting to the deformation of the battery cell 10 structure. The lithium storage layer 300 can fully exert its lithium storage function inside the battery cell 10, not only ensuring the repair of the negative electrode interface (SEI), but also effectively improving the lithium-ion storage capacity during charging and discharging, thereby enhancing the efficiency and stability of the entire battery cell 10.

[0085] In one embodiment, polymer solid electrolytes (SPEs) comprise a mixture of a polymeric polymer and a lithium salt material, wherein the polymeric polymer and the lithium salt material are dissolved in a solvent.

[0086] It should be noted that the polymer and lithium salt materials are dissolved in a solvent, which is usually anhydrous acetonitrile, acetone, etc., which helps to form a homogeneous electrolyte solution.

[0087] In a specific embodiment, the polymer electrolyte mixture undergoes thorough stirring and heating to ensure uniform dispersion of the polymer and lithium salt material, thereby improving ionic conductivity and the overall performance of the battery cell 10. The advantage of this electrolyte system is that the mixed polymer provides good mechanical strength and flexibility, while the lithium salt material enhances the ionic conductivity of the electrolyte, allowing the battery cell 10 to maintain good performance even during high-rate charge and discharge. Furthermore, this dissolution process reduces the brittleness common in inorganic electrolytes, resulting in better overall material durability and safety.

[0088] In some embodiments, the polymer includes at least one of polyethylene oxide (PEO), polyacrylonitrile (PAN), polymethyl methacrylate (PMMA), polyvinylidene fluoride (PVDF), polyvinylidene fluoride-polymer (PVDF-HFP), or polypropylene carbonate (PPC). Each of these polymers possesses specific advantages. For example, PEO is known for its excellent ionic conductivity and mechanical flexibility, making it suitable for high-performance battery applications; PAN exhibits good thermal stability, making it suitable for batteries used in high-temperature environments; PMMA provides good transparency and electrical insulation properties; and PVDF possesses excellent chemical stability and mechanical strength, making it suitable for more demanding environments.

[0089] In terms of lithium salt materials, there are at least one of LiTFSI, LiFSI, LiPF6, or LiClO4. Each of these lithium salt materials has its own advantages. LiTFSI is widely used due to its high ionic conductivity and excellent chemical stability, while LiPF6 is valued for its high electrolyte conductivity and good interfacial compatibility. By rationally selecting lithium salts, the overall performance of the electrolyte can be effectively improved.

[0090] Specifically, the combination of polymer and lithium salt materials can be flexibly adjusted according to actual design requirements to ensure the formation of an optimal polymer electrolyte combination. It should be noted that different ratios and types of polymers and lithium salts directly affect the ionic conductivity, mechanical properties, and thermal stability of the battery cell 10. When the polymer or lithium salt is not within the preferred range, it may reduce the performance of the electrolyte, leading to problems such as decreased efficiency and shortened cycle life of the battery cell 10 during charge and discharge. Therefore, the characteristics and applicability of various polymers and lithium salts should be fully considered when selecting materials to achieve high efficiency and stability of the battery cell 10.

[0091] In one embodiment, inorganic-organic composite solid electrolytes (CSEs) comprise a mixture of polymeric materials, lithium salt materials, and inorganic fillers. In some embodiments, inorganic-organic composite solid electrolytes can be formed by adding inorganic fillers to a polymeric solid electrolyte.

[0092] In this embodiment, the introduction of inorganic fillers can significantly improve the mechanical strength and thermal stability of the electrolyte, enabling it to maintain good structural integrity even at high temperatures. Furthermore, the inorganic fillers include Garnet-type materials, NASICON-type materials, Perovskite-type materials, CeO2 porous materials, Co3O4 porous materials, CuO porous materials, or FeS2 porous materials.

[0093] Specifically, the addition of inorganic fillers can significantly improve the mechanical strength and thermal stability of the electrolyte, ensuring the safety and reliability of the battery cell 10 under high temperature and high pressure environments. For example, Garnet-type materials are known for their excellent ionic conductivity and chemical stability, making them suitable for solid-state batteries; NASICON-type materials have large ion conduction channels, effectively improving the conductivity of molten solid electrolytes; and perovskite-type materials are characterized by good electrical conductivity and thermal stability. The number of inorganic fillers can be one, two, or more, without a specific limitation. Combining multiple fillers can create a synergistic effect, further optimizing the performance of the electrolyte.

[0094] Furthermore, polymer electrolytes also include lithium supplements.

[0095] In this embodiment, the addition of lithium replenishing agent helps to increase the lithium ion concentration in the polymer electrolyte, thereby improving ionic conductivity and the overall efficiency of the battery cell 10.

[0096] In some embodiments, the lithium replenishing agent includes Li5FeO4 or Li2O2 materials. It should be noted that the choice of lithium replenishing agent plays a crucial role in the lithium-ion concentration of the electrolyte and the overall performance of the battery cell 10. Specifically, Li5FeO4 has a high theoretical capacity in electrochemical reactions, effectively improving the energy density of the battery cell 10; while Li2O2 exhibits good cycle stability during charge and discharge, making it suitable for high-rate charging applications. The specific amount of lithium replenishing agent added can be determined according to the design requirements of the electrolyte to ensure optimal ionic conductivity and battery life.

[0097] Specifically, the mass ratio of lithium supplement to inorganic filler in the inorganic-organic composite solid electrolyte is 1-5:2-5, specifically 3:2, 1:2, 1:3, 2:3, 2:5, 3:4, 4:3, or 5:2. This ratio is chosen to achieve a balance between good ionic conductivity and mechanical strength of the electrolyte.

[0098] First, the role of the lithium supplement is to provide the necessary lithium ions to improve the ionic conductivity of the electrolyte, while the inorganic filler enhances the structural stability and mechanical strength of the electrolyte. By adjusting the ratio of the two, the electrolyte's conductivity and strength can be precisely controlled. For example, at a ratio of 1:2, a higher content of inorganic filler helps improve the solid-state mechanical properties of the electrolyte, resulting in better stability under high temperature and high pressure conditions. At a ratio of 2:3, the relative increase in lithium supplement helps improve ionic conductivity, enabling the battery to achieve higher current densities during charging and discharging.

[0099] Furthermore, the provided mass ratio ranges (e.g., 3:2, 1:2, etc.) actually form a series of best engineering practices, providing a basis for the optimization of electrolyte materials. It should be noted that the overall performance of the electrolyte depends not only on the mass ratio of lithium supplementer to inorganic filler, but also on the selection of specific materials and their preparation process. Therefore, in practical implementation, the ratio should be adjusted according to actual needs to achieve the best mixing effect.

[0100] For example, when selecting lithium supplements, different types of lithium sources can be considered, such as lithium salts and lithium oxides. These choices directly affect the conductivity of the electrolyte. Simultaneously, the inorganic fillers used can be alumina, silicon dioxide, etc. These fillers have good chemical and thermal stability, effectively preventing electrolyte decomposition and improving battery safety. Therefore, the specific ratio needs to be optimized based on the performance requirements of each battery cell during the design phase. In practical applications, changes in the ratio can consequently affect the battery's charge / discharge efficiency, cycle life, and safety.

[0101] The specific mass ratio in this embodiment not only ensures good conductivity of the electrolyte, but also enhances its thermal stability and mechanical strength through the rational selection of inorganic fillers, thereby improving the performance of the battery cell 10 in terms of kinetics and lifespan. By combining the excellent properties of lithium replenishing agents and inorganic fillers, this composite solid electrolyte possesses the ability to cope with high-rate charge and discharge, exhibiting superior performance.

[0102] In preparing the lithium storage layer 300 of this embodiment, a polymer and a lithium salt (which can be LiTFSI, with a ratio of EO / Li+ = 12:1) are first dissolved in anhydrous acetonitrile. This formulation allows the polymer to form a homogeneous solution with the lithium salt, improving the lithium-ion migration efficiency. Then, 10%-30% of a solid filler is added to the solution, and the mixture is stirred at room temperature to obtain a viscous slurry. This slurry is then coated and dried to obtain a flexible inorganic-organic composite thin layer. The solid filler is a mixture of lithium supplementer and inorganic filler in a 3:2 ratio. This ratio is designed to achieve an optimal balance between the lithium supplementer and the inorganic filler, ensuring that the lithium storage layer has high lithium storage capacity and good conductivity.

[0103] Of course, in another embodiment, lithium replenishing agent can be added only to the polymer and lithium salt materials. Compared with inorganic-organic composite solid electrolyte, the polymer electrolyte in this embodiment eliminates the need for inorganic fillers, yet still achieves the lithium ion replenishment function.

[0104] In one embodiment, the battery cell 10 is a blade battery. The blade battery is a novel battery structure whose design philosophy emphasizes not only compact size and improved efficiency, but also performance and safety under high-rate charging conditions. By applying the aforementioned improvements to the blade battery, namely, using optimized terminal block layout and tab structure, the overall performance of the blade battery can be significantly improved.

[0105] Specifically, the improved electrode layout provides a more reasonable relative position for the first tab 210 and the second tab 220 of the battery cell 10, effectively shortening the transfer path of lithium ions inside the battery. This design reduces the internal resistance of the battery cell 10, thereby improving its charging efficiency and meeting the requirements of fast charging. In fast charging scenarios, reducing the distance of lithium ion transfer means that a higher charging rate can be achieved, which is particularly crucial for high-energy-density blade batteries.

[0106] Furthermore, the improved tab structure, particularly the extension of the tabs along the second direction, effectively increases the current-carrying area of ​​the tabs. This extended design not only enhances the battery's ability to charge at high rates but also provides superior thermal management performance. During fast charging, heat is distributed more evenly within the battery, reducing temperature differences between the two ends of the tabs. This uniformity significantly reduces the risk of thermal runaway during fast charging, especially under extreme operating conditions, providing crucial protection for the blade battery's safety.

[0107] Specifically, the core structure 200 has a dimension of L in the first direction, a dimension of H in the second direction, and a dimension of D in the third direction. The first direction is the length direction of the core structure 200, the second direction is the width direction of the core structure 200, and the third direction is the thickness direction of the core structure 200. The core structure 200 satisfies the following relationships: 300mm≤L≤1100mm, 60mm≤H≤160mm, and 10mm≤D≤40mm.

[0108] In this design, the battery cell 10 can be flexibly configured as a short-blade battery or a long-blade battery. Specifically, the length L of the core structure 200 can be 300mm, 600mm, 800mm, or 1100mm; the width H of the core structure 200 can be 60mm, 100mm, 120mm, or 160mm; and the thickness D of the core structure 200 can be 10mm, 20mm, 30mm, or 40mm. During the design process, the size scheme of the battery cell 10 needs to be determined according to the actual technical requirements and environmental conditions.

[0109] See Figure 5 and Figure 6 As shown, the present invention also provides a battery pack 1, which includes a pack shell 20 and a battery cell 10 as described in any of the above embodiments; the number of battery cells 10 is multiple, and the multiple battery cells 10 are electrically connected and housed within the pack shell 20.

[0110] In the battery pack 1 of this embodiment, by adopting the battery cell 10 from any of the above embodiments, the structural design of the battery cell 10 can be effectively optimized. This design mainly improves the arrangement direction of the first tab 210 and the second tab 220 in the core structure 200 within the battery casing 100. Specifically, by reasonably adjusting the arrangement of the tabs, the transfer path of lithium ions between the positive and negative electrodes can be further shortened while ensuring the current flow area between the first tab 210 and the second tab 220. This structural optimization not only reduces the internal resistance of the battery pack 1 but also significantly improves the current flow capacity of the battery cell 10, meeting the requirements of high power output.

[0111] Specifically, multiple battery cells 10 can be connected in series end-to-end to achieve higher voltage output. Furthermore, in different application scenarios, the number of these battery cells 10 can be one, two, or more, but this is not a fixed limitation. Using multiple battery cells 10 will enable the system to have higher energy density and power density, improving the overall performance of the battery pack 1. However, it should be noted that as the number of battery cells 10 increases, the integration and safety of the entire battery pack 1 also need to be designed accordingly to avoid potential safety hazards. For example, if the number of battery cells 10 is too small, it may not be able to meet the high power output requirements, resulting in a decrease in the performance of the battery pack 1 under heavy load conditions. Therefore, in specific implementation, a comprehensive consideration based on the actual usage scenario and user needs is required.

[0112] In some embodiments, multiple battery cells 10 are stacked within the housing 20 along the width and / or thickness directions of the housing 20. This design aims to fully utilize the internal space of the housing 20 to achieve an efficient layout of the battery cells 10, thereby improving the overall energy density and performance.

[0113] Specifically, the battery cells 10 can be stacked in a variety of arrangements. These battery cells 10 can be arranged in parallel, staggered, or interleaved layers to optimize their space allocation within the housing 20. For example, when the battery cells 10 are stacked in a parallel arrangement, the current flow path during charging and discharging is minimized, reducing internal resistance and improving charging and discharging efficiency. In an interleaved stacked layout, the interaction between the battery cells 10 is better, which helps improve thermal management, making the overall temperature field more uniform and reducing safety hazards caused by localized overheating.

[0114] Furthermore, the number of battery cells 10 stacked can be one, two, or more, and there is no single limitation. Determining the exact number of stacked cells, based on the battery's technical requirements and actual application scenarios, allows for an optimal balance between the energy output and volumetric efficiency of the battery pack 1. For example, increasing the number of battery cells 10 significantly improves the overall energy storage capacity of the battery pack, making it suitable for applications requiring long-term discharge or high energy density. However, excessive stacking also necessitates careful thermal management design to ensure adequate heat dissipation during actual use, preventing performance degradation or thermal runaway due to overheating. This optimized stacking configuration minimizes the volume and weight of the outer casing 20, thereby improving energy density and power output.

[0115] Furthermore, the battery pack 1 also includes a battery assembly, which includes multiple battery cells 10 located on the same layer. The battery pack 1 also includes a moving mechanism 30, which is slidably connected to the outer shell 20 of the pack via the moving mechanism 30. The moving mechanism 30 can move the battery assembly out of the outer shell 20 of the pack.

[0116] In this embodiment, a moving mechanism 30 is provided to connect the battery pack, which facilitates the assembly or maintenance of individual battery cells 10. For example, during later use, the user can use the moving mechanism 30 to replace a single battery cell 10 or a group of battery cells in the battery pack 1, greatly improving the convenience of maintenance. In some embodiments, when there are multiple battery cells, the multiple battery cells can be stacked along the thickness direction of the battery pack 1, and each battery cell can be connected to a moving mechanism 30 in a one-to-one manner so that the outer shell 20 of the pack can be pulled out individually.

[0117] In one embodiment, the moving mechanism 30 includes a support member 31 and a connector 32. The support member 31 is slidably connected to the outer shell 20 of the battery pack via the connector 32, and the support member 31 is used to support the battery cell 10 below along the thickness direction of the battery pack 1.

[0118] Specifically, multiple battery cells 10 can be mounted on a single support 31. The support 31 is connected to the battery cells 10 along the thickness direction of the battery pack 1 at its lower end, and the support 31 is then connected to the outer shell 20 of the pack via a connector 32. This design ensures the stability of the entire battery assembly during replacement and facilitates unified operation. In some embodiments, each battery cell 10 may be mounted on a corresponding support 31, and the corresponding battery cell 10 can be moved by individually pulling out the support 31; this is not a unique limitation.

[0119] It should be noted that the specific type of connector 32 can be a linear guide rail, a pulley, or other forms of sliding connection mechanism. This versatility allows for adaptability to different application environments, ensuring a smooth user experience during battery cell replacement or maintenance. Furthermore, the moving mechanism 30 can be designed as a single mechanism or a combination of multiple mechanisms; the specific number and form are selected based on design requirements and are not limited here.

[0120] In one embodiment, the battery pack 1 further includes a cooling plate 40, which is attached to the top of the battery cell 10 along the thickness direction of the battery pack 1.

[0121] In this embodiment, by setting the cooling plate 40 to cooperate with the battery cell 10, the cooling plate 40 can absorb the heat emitted by the battery cell 10 to cool the battery cell 10, thereby improving the stability and reliability of the battery pack 1.

[0122] Multiple battery cells 10 are combined to form a multi-layer structure. Specifically, the number of layers can be two, three, or more, depending on the actual design requirements, and is not limited to a single layer. The cooling plate 40 is preferably attached to the top of the battery cell 10, which can improve the overall thermal management effect and ensure that each layer of battery cell 10 can operate at the optimal temperature.

[0123] When cooling of the battery pack 1 is required, the cooling plate 40 is activated, effectively cooling the individual battery cells 10 in contact with it. The advantage of this design is that by introducing the cooling plate 40, the heat dissipation capacity of the battery pack 1 is improved, preventing performance degradation or safety hazards caused by excessively high temperatures. Simultaneously, this connection method makes the overall structure of the battery pack 1 more compact, facilitating the efficient combination of multiple battery cells 10 within a limited space.

[0124] See Figure 6 As shown, in one embodiment, the battery pack 1 includes two battery packs, each battery pack including at least one battery cell 10; the two battery packs are stacked along the thickness direction of the battery pack 1, and are respectively the first battery pack and the second battery pack. A moving mechanism 30 is provided at the bottom of the first battery pack, and at least one cooling plate 40 is provided at the top of the first battery pack; the second battery pack is located on top of the first battery pack and is connected to the outer shell 20 of the pack through the moving mechanism 30, and another cooling plate 40 is located on top of the battery cell 10 in the second battery pack.

[0125] With this configuration, the first and second battery packs can be pulled out via the corresponding moving mechanism 30. At the same time, since the first and second battery packs are respectively equipped with cooling plates 40 corresponding to the battery cells 10, the cooling effect of the battery pack 1 can also be guaranteed.

[0126] Furthermore, the battery pack 1 also includes a pressing protrusion 50, which is located between two adjacent battery cells 10 and is pressed against the outer wall of at least one battery cell 10.

[0127] By applying pressure to the battery cell 10 along a third direction using the pressing protrusion 50, the interfacial contact state between the electrode layers inside the battery cell 10 can be effectively improved. Specifically, this pressure can be transmitted to the electrode stack structure of the core, making the adhesion between the stack structures tighter. When the battery cell 10 expands during charge-discharge cycles, the elastic deformation of the pressing protrusion 50 can compensate for the volume change, continuously maintaining a suitable pressure level, thereby reducing the internal resistance of the battery cell 10 and improving the cycle life of the battery cell 10.

[0128] In some embodiments, the crimping protrusion 50 may be made of an elastically deformable material, such as silicone rubber or polyurethane composite material, which can deform under pressure to adapt to the geometry of the outer wall of the battery cell 10. In a preferred embodiment, the crimping protrusion 50 may be configured as an arc-shaped protrusion or a wavy structure, which increases the contact area with the outer wall of the battery cell 10, thereby transmitting pressure more evenly.

[0129] It should be noted that, in order to ensure the pressure effect of the pressing protrusion 50, in a preferred embodiment, when the battery cell 10 is a plate-shaped battery, the pressing protrusion 50 is preferably attached to the larger side surface of the two battery cells 10 respectively (such as contacting the third side wall 113 of the battery cell 10) to ensure the contact area between the pressing protrusion 50 and the battery cell 10, thereby improving the pressure uniformity of the pressing protrusion 50.

[0130] It should be noted that the number of pressing protrusions 50 can be one, two, or more, to meet the design requirements of different battery packs 1. By setting multiple pressing protrusions 50 to cooperate with multiple battery cells 10 respectively, the pressing effect of each battery cell 10 can be guaranteed. In this embodiment, the orthographic projection of the pressing protrusion 50 on the battery cell 10 is preferably located inside the battery cell 10; of course, it is also possible to set the pressing protrusions 50 to press onto the surfaces of multiple battery cells 10 at the same time, and this is not the only limitation.

[0131] Specifically, when the battery pack 1 is provided with a support member 31, the pressing protrusion 50 can be provided at the bottom of the support member 31 so that when the support member 31 moves into the outer shell 20 of the pack, pressure can be applied to the battery cell 10 located at the bottom of the support member 31 through the pressing protrusion 50. In some embodiments, the pressing protrusion 50 can also be provided on the bottom surface of one layer of battery cells 10, and the pressing protrusion 50 presses against the battery cell 10 of the next layer of battery cells 10; the pressing effect of the pressing protrusion 50 can be achieved in at least two of the above embodiments, and the specific location of the pressing protrusion 50 is not limited here.

[0132] The present invention also provides an electrical device comprising a battery pack 1 as described in any of the above embodiments, or a battery cell 10 as described in any of the above embodiments.

[0133] It is understood that the electrical device of this embodiment, by setting the battery cell 10 in any of the above embodiments, improves the overcurrent capacity of the battery cell 10 by improving the layout of the first tab 210 and the second tab 220 in the core structure 200 relative to the battery casing 100, so as to meet the needs of the high energy density fast charging battery of the electrical device.

[0134] When the electrical device is a vehicle, the battery pack 1 is designed to improve the vehicle's power supply efficiency and range. Furthermore, the battery pack 1 enhances its performance through an optimized structural design of the individual battery cells 10. Specifically, this embodiment improves the arrangement of the first tab 210 and the second tab 220 in the electrode core structure 200. Through this optimized arrangement, the tab layout can ensure the current-carrying area between the first tab 210 and the second tab 220 while shortening the lithium-ion transfer path between the two electrodes, thus reducing the battery's internal resistance. This structural optimization improves the current-carrying capacity of the individual battery cells 10, meeting the demands of high power output, such as providing stable current output under high load conditions.

[0135] In one embodiment, the battery pack 1 is detachably connected to the vehicle body. This detachable feature allows users to quickly replace the battery during long journeys or high-energy-consumption scenarios, thus avoiding range anxiety caused by insufficient power. Users can easily install and remove the battery pack, greatly improving ease of use and meeting the modern user's demand for high efficiency and convenience.

[0136] In one embodiment, the design of the moving mechanism 30 allows the battery cell 10 to move toward the side of the vehicle, facilitating maintenance by an operator from the side of the vehicle. This design not only improves the ease of maintenance but also ensures safety and efficiency during operation, allowing operators to easily inspect or replace the battery cell 10.

[0137] In the description of the embodiments of this application, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," 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 the embodiments of this application and simplifying the description, and 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. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0138] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to 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 the embodiments of this application based on the specific circumstances.

[0139] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0140] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0141] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell (10), characterized in that, include: The battery housing (100) has an internal cavity, and the battery housing (100) includes two first sidewalls (111) arranged opposite each other in a first direction and two second sidewalls (112) arranged opposite each other in a second direction. The area of ​​the second sidewalls (112) is larger than the area of ​​the first sidewalls (111), and the first direction and the second direction are arranged at an angle. The second sidewalls (112) have through slots (1121) communicating with the cavity. as well as The electrode core structure (200) is housed in the receiving cavity; the electrode core structure (200) includes a first tab (210) and a second tab (220), the first tab (210) and the second tab (220) respectively passing through the through groove (1121) on the outside of the battery casing (100).

2. The battery cell (10) according to claim 1, characterized in that, The battery casing (100) further includes a third sidewall (113) disposed opposite to the second sidewall (112) in a third direction. The area of ​​the third sidewall (113) is larger than that of the second sidewall (112), and the third direction is disposed at an angle to the first direction and the second direction, respectively.

3. The battery cell (10) according to claim 2, characterized in that, Each of the second sidewalls (112) is provided with a plurality of through slots (1121), which are arranged in parallel and spaced apart. There are multiple pole core structures (200), and each pole core structure (200) is arranged in a one-to-one correspondence with a plurality of through slots (1121).

4. The battery cell (10) according to claim 1, characterized in that, The through groove (1121) includes a first through groove (11211) and a second through groove (11212), and the first through groove (11211) and the second through groove (11212) are respectively disposed on two opposite second sidewalls (112) in the second direction. The first electrode tab (210) passes through the first through groove (11211) and is disposed on the outside of the battery housing (100). The second electrode tab (220) passes through the second through groove (11212) and is disposed on the outside of the battery housing (100).

5. The battery cell (10) according to claim 1, characterized in that, The number of the electrode core structures (200) is multiple, and the multiple electrode core structures (200) are stacked; a lithium storage layer (300) is provided between two adjacent electrode core structures (200).

6. The battery cell (10) according to claim 5, characterized in that, The lithium storage layer (300) includes a solid electrolyte.

7. The battery cell (10) according to claim 6, characterized in that, The solid electrolyte includes polymer solid electrolytes or inorganic-organic composite solid electrolytes.

8. The battery cell (10) according to claim 7, characterized in that, The polymer solid electrolyte comprises a mixture of high molecular weight polymers and lithium salt materials.

9. The battery cell (10) according to claim 7, characterized in that, The inorganic-organic composite solid electrolyte comprises a mixture of polymer, lithium salt material, and inorganic filler.

10. The battery cell (10) according to claim 9, characterized in that, The inorganic-organic composite solid electrolyte also includes a lithium supplement, and the mass ratio of the lithium supplement to the inorganic filler is (1-5):(2-5).

11. The battery cell (10) according to claim 6, characterized in that, The solid electrolyte also includes a lithium supplement.

12. The battery cell (10) according to any one of claims 1-11, characterized in that, The core structure (200) has a dimension L in the first direction, a dimension H in the second direction, and a dimension D in the third direction. The first direction is the length direction of the core structure (200), the second direction is the width direction of the core structure (200), and the third direction is the thickness direction of the core structure (200). The core structure (200) satisfies the following relationships: 300mm≤L≤1100mm, 60mm≤H≤160mm, 10mm≤D≤40mm.

13. The battery cell (10) according to any one of claims 1-12, characterized in that, The battery casing (100) includes a casing body (110) and a cover plate (120). The casing body (110) forms the first sidewall (111). The cover plate (120) is connected to the opening of the casing body (110) and forms the second sidewall (112). The cover plate (120) has the through groove (1121) and is connected to the first electrode (210) and / or the second electrode (220).

14. A battery pack (1), characterized in that, include: Encapsulation shell (20); as well as A plurality of battery cells (10) as described in any one of claims 1-13, wherein the plurality of battery cells (10) are electrically connected and housed within the housing (20).

15. The battery pack (1) according to claim 14, characterized in that, Multiple battery cells (10) are stacked inside the housing (20) along the width direction and / or the thickness direction of the housing (20).

16. The battery pack (1) according to claim 15, characterized in that, The battery pack (1) also includes a battery assembly, which includes multiple battery cells (10) located on the same layer. The battery pack (1) also includes a moving mechanism (30), which is slidably connected to the outer shell (20) of the pack via the moving mechanism (30). The moving mechanism (30) can move the battery assembly out of the outer shell (20).

17. The battery pack (1) according to claim 16, characterized in that, The moving mechanism (30) includes a support (31) and a connector (32). The support (31) is slidably connected to the outer shell (20) of the pack via the connector (32), and the support (31) is used to support the battery cell (10). The support (31) is located below the battery cell (10) along the thickness direction of the battery pack (1).

18. The battery pack (1) according to any one of claims 14-17, characterized in that, The battery pack (1) also includes a cooling plate (40), which is attached to the top of the battery cell (10) along the thickness direction of the battery pack (1).

19. The battery pack (1) according to any one of claims 14-17, characterized in that, The battery pack (1) further includes a crimping protrusion (50) located between two adjacent battery cells (10) and crimped against the outer wall of at least one battery cell (10).

20. An electrical appliance, characterized in that, Includes the battery pack (1) as described in any one of claims 14-19, or the battery cell (10) as described in any one of claims 1-13.

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