Battery cells, batteries and power consuming devices

Abstract

The battery cell, battery, and power consumption device include a battery cell (71) including an electrode assembly (10) having a positive electrode plate (11) and a negative electrode plate (12), the positive electrode plate (11) including a positive electrode current collector (111) and a positive electrode active material (112) disposed on the positive electrode current collector (111), the positive electrode active material (112) including an active material capable of reversibly absorbing and releasing sodium ions, the negative electrode plate (12) including a negative electrode current collector (121), the negative electrode current collector (121) including a metal substrate (121b), wherein the constituent material of the metal substrate (121b) includes aluminum, and the mass percentage of the aluminum element is greater than the mass percentage of each of the other elements.

Description

[Technical Field]

[0001] The present disclosure relates to the field of battery technology, and more particularly to battery cells, batteries, and power consuming devices. [Background technology]

[0002] As environmental pollution worsens, the new energy industry is attracting more and more attention. Battery technology is an important factor in the development of the new energy industry. Due to the abundant supply of sodium salt raw materials, low cost, and more stable electrochemical performance compared to lithium-ion batteries, research on batteries based on sodium electric systems is gradually gaining attention. Summary of the Invention [Problem to be solved by the invention]

[0003] In one aspect of the present disclosure, there is provided a battery cell, the battery cell comprising: The battery includes an electrode assembly having a positive electrode plate and a negative electrode plate, the positive electrode plate including a positive electrode current collector and a positive electrode active material disposed on the positive electrode current collector, the positive electrode active material including an active material capable of reversibly absorbing and releasing sodium ions, the negative electrode plate including a negative electrode current collector, the negative electrode current collector including a metal substrate, Here, the constituent material of the metal substrate contains aluminum element, and the mass percentage of the aluminum element is greater than the mass percentage of each of the other elements.

[0004] In related art, lithium batteries use copper foil as the negative electrode current collector because it has good conductivity, is not easily oxidized at low potential, and undergoes an alloying reaction with lithium. However, in sodium electric systems, considering that sodium and aluminum do not undergo an alloying reaction at low potential and aluminum is inexpensive, it can replace copper foil to form the substrate of the negative electrode current collector. Therefore, an aluminum alloy or metal aluminum in which the mass percentage of aluminum element is higher than the mass percentages of other elements can be selected as the metal substrate of the negative electrode current collector, thereby reducing costs and weight.

[0005] In some embodiments, the battery cell comprises: a housing having a chamber for receiving the electrode assembly; The battery further includes a negative electrode lead-out portion disposed on the housing for electrically connecting the metal substrate to a conductor external to the battery cell.

[0006] The negative electrode lead portion provides electrical connection between the metal substrate of the negative electrode plate and the conductor outside the battery cell, realizing continuity between the internal and external components of the battery, thereby fulfilling the charge and discharge functions of the battery.

[0007] In some embodiments, the negative electrode lead portion has an integrally molded structure, and the constituent material of the negative electrode lead portion contains aluminum element, and the mass percentage of the aluminum element is greater than the mass percentage of each of the other elements.

[0008] The integrally molded negative electrode lead portion is composed entirely of aluminum, with the mass percentage of aluminum being greater than the mass percentages of the other elements. The battery cell uses this negative electrode lead portion to establish electrical connection between the negative electrode current collector and an external conductor. In contrast to related art techniques that use copper foil as the negative electrode current collector, which requires a relatively complex copper-aluminum composite post to be welded to copper foil and aluminum busbar members on the inside and outside of the battery cell, this negative electrode lead portion, primarily composed of aluminum, can establish electrical connection with the aluminum negative electrode current collector and a busbar member made of pure aluminum or an aluminum alloy, such as an aluminum foil, improving the connection reliability of fixed connection methods such as welding while also simplifying the structure of the negative electrode lead portion and reducing the complexity and cost of processing.

[0009] In some embodiments, the constituent material of the metal substrate and the constituent material of the negative electrode lead portion each contain aluminum element in a mass percentage of 90% or more.

[0010] The constituent material of the metal substrate of the negative electrode current collector and the constituent material of the negative electrode lead portion are both aluminum alloy materials or pure aluminum materials containing aluminum elements at a mass percentage of 90% or more, thereby achieving better conductivity and reducing weight. Furthermore, because both constituent materials contain relatively high amounts of aluminum elements, it is easier to achieve a reliable connection effect when performing connection processes such as welding.

[0011] In some embodiments, the negative electrode lead portion has a separate structure, and includes a negative electrode internal connection portion and a negative electrode external connection portion that are fixedly connected, the negative electrode internal connection portion is electrically connected to the metal substrate, and the negative electrode external connection portion is used to connect to a conductor outside the battery cell, and both of the constituent materials of the negative electrode internal connection portion and the negative electrode external connection portion contain aluminum elements, and the mass percentage of the aluminum elements is greater than the mass percentage of each of the other elements.

[0012] The negative electrode lead portion is used to establish electrical connection with the negative electrode current collector and to connect to an external conductor using a negative electrode internal connection portion and a negative electrode external connection portion, whose constituent materials contain a greater mass percentage of aluminum than other elements and are fixedly connected. In contrast to the related art, which uses copper foil as the negative electrode current collector, which requires a relatively complex copper-aluminum composite post to be welded to copper foil and aluminum busbar members on the inside and outside of the battery cell, the negative electrode lead portion uses a negative electrode internal connection portion and a negative electrode external connection portion, each of which is primarily composed of aluminum, to establish electrical connection with the aluminum negative electrode current collector and a busbar member made of pure aluminum or an aluminum alloy, such as an aluminum plate. This improves the connection reliability of fixed connection methods such as welding, while also further simplifying the structure of the negative electrode lead portion and reducing the complexity and cost of processing.

[0013] In some embodiments, the constituent material of the metal substrate, the constituent material of the negative electrode internal connection part, and the constituent material of the negative electrode external connection part all contain aluminum element in a mass percentage of 90% or more.

[0014] The constituent material of the metal substrate of the negative electrode current collector and the constituent material of the negative electrode lead portion are both aluminum alloy materials or pure aluminum materials containing aluminum elements at a mass percentage of 90% or more, thereby achieving better conductivity and reducing weight. Furthermore, because both constituent materials contain relatively high amounts of aluminum elements, it is easier to achieve a reliable connection effect when performing connection processes such as welding.

[0015] In some embodiments, the battery cell comprises: a negative electrode adapter that electrically connects the metal substrate and the negative electrode lead portion; Here, the constituent material of the negative electrode adapter contains aluminum element, and the mass percentage of the aluminum element is greater than the mass percentage of each of the other elements.

[0016] The negative electrode adapter is installed to connect the metal base of the negative electrode current collector to the negative electrode lead portion, and the constituent materials of the metal base and the negative electrode lead portion both contain aluminum elements in mass percentages greater than those of other elements. Therefore, the negative electrode adapter can improve the connection reliability of fixed connection methods such as welding between the metal base and the negative electrode lead portion, and can simplify the structure of the negative electrode adapter portion, reducing the complexity and cost of processing.

[0017] In some embodiments, the material of the negative electrode adapter contains aluminum element in a mass percentage of 90% or more.

[0018] The constituent material of the metal substrate of the negative electrode current collector, the constituent material of the negative electrode adapter, and the constituent material of the negative electrode lead-out portion may all be an aluminum alloy material or a pure aluminum material containing 90% or more by mass of aluminum, thereby achieving better conductivity and reducing weight. Furthermore, because all three constituent materials contain a relatively high content of aluminum, it is easier to achieve a reliable connection effect when performing a connection process such as welding.

[0019] In some embodiments, the negative electrode current collector is made of the metal substrate, and the constituent material of the metal substrate contains aluminum element in a mass percentage of 99% or more.

[0020] The use of a negative electrode current collector made of a material containing 99% or more aluminum by mass as a whole corresponds to a negative electrode current collector in the form of pure aluminum foil or a form close to pure aluminum foil, which can achieve good electrical conductivity and relatively high plasticity and ductility, making it easy to form by methods such as winding, and accommodating expansion of the electrode assembly during charging.

[0021] In some embodiments, the negative electrode current collector further includes a first insulating material layer, the metal substrates are disposed on both sides of the first insulating material layer in a thickness direction, and the constituent material of the metal substrates contains aluminum element in a mass percentage of 99% or more.

[0022] The negative electrode current collector has a layered composite structure, with a metal substrate made of a material containing 99% or more aluminum by mass attached to both sides of the first insulating material layer, which provides good electrical conductivity and relatively high plasticity, while further reducing the weight and improving the ductility and strength of the negative electrode current collector.

[0023] In some embodiments, the battery cell comprises: a housing having a chamber for receiving the electrode assembly; a positive electrode lead-out portion disposed in the housing for electrically connecting the positive electrode current collector to a conductor external to the battery cell; Here, the constituent material of the positive electrode lead portion contains aluminum element, and the mass percentage of the aluminum element is greater than the mass percentage of each of the other elements.

[0024] The positive electrode lead portion, which is made of a material containing a larger mass percentage of aluminum than other elements, can be used to establish electrical connection with the positive electrode current collector and to connect to an external conductor. The positive electrode lead portion, which is mainly made of aluminum, establishes electrical connection between the aluminum positive electrode current collector and a busbar member made of pure aluminum or an aluminum alloy, such as an aluminum busbar, thereby improving the connection reliability of fixed connection methods such as welding, while further simplifying the structure of the positive electrode lead portion and reducing the complexity and cost of processing.

[0025] In some embodiments, the material of the positive electrode lead portion contains aluminum element in a mass percentage of 90% or more.

[0026] The positive electrode lead portion is made of an aluminum alloy material or a pure aluminum material containing 90% or more by mass of aluminum, which makes it easier to achieve a reliable connection during a connection process such as welding. Such a positive electrode lead portion also has better electrical conductivity and is relatively light in weight.

[0027] In some embodiments, the battery cell comprises: a positive electrode adapter electrically connected to the positive electrode lead portion and the positive electrode current collector, Here, the constituent material of the positive electrode adapter contains aluminum element, and the mass percentage of the aluminum element is greater than the mass percentage of each of the other elements.

[0028] The positive electrode adapter is installed to connect the positive electrode adapter to the positive electrode current collector and the positive electrode lead portion, and the constituent materials of the positive electrode adapter and the positive electrode lead portion both contain aluminum elements in mass percentages greater than those of other elements. This improves the connection reliability of the positive electrode adapter and the positive electrode lead portion when fixedly connecting them by welding or other methods, and simplifies the structure of the positive electrode adapter portion, reducing the complexity and cost of processing.

[0029] In some embodiments, the positive electrode adapter is made of a material containing aluminum at a mass percentage of 90% or more.

[0030] The constituent materials of the positive electrode adapter and the positive electrode lead portion may both be aluminum alloy materials or pure aluminum materials containing 90% or more by mass of aluminum, thereby achieving better conductivity and reducing weight. Furthermore, because the constituent materials of the positive electrode adapter and the positive electrode lead portion both contain a relatively high content of aluminum, it is easier to achieve a reliable connection effect when performing connection processes such as welding.

[0031] In some embodiments, the positive electrode current collector is a metal current collector, and the constituent material of the metal current collector contains aluminum element in a mass percentage of 99% or more.

[0032] The use of a positive electrode current collector made of a material containing 99% or more aluminum by mass as a whole corresponds to a metal current collector in the form of pure aluminum foil or a form close to pure aluminum foil, which can achieve good conductivity and relatively high plasticity, making it easy to form, for example, by winding, and accommodating expansion of the electrode assembly during charging. Furthermore, such a metal current collector does not require a heterogeneous metal composite structure, can be more easily connected to the positive electrode lead, and can simplify the battery structure.

[0033] In some embodiments, the positive electrode current collector includes a second insulating material layer and conductive layers located on both sides of the second insulating material layer in a thickness direction of the second insulating material layer, and a constituent material of the conductive layer includes aluminum element in a mass percentage of 99% or more.

[0034] The positive electrode current collector employs a layered composite structure, with conductive layers made of a material containing 99% or more aluminum by mass on both surfaces of the second insulating material layer, achieving good conductivity and relatively high plasticity while further reducing weight and improving the ductility and strength of the positive electrode current collector. Furthermore, such conductive layers can be more easily connected to the positive electrode lead-out portion without the need for a dissimilar metal composite structure, simplifying the battery structure.

[0035] In some embodiments, the housing includes a case and a top cover, one end of the case having an end opening, the top cover being secured to the end opening; wherein the top cover is electrically connected to the metal base as the negative electrode lead portion and is used for connection to a conductor outside the battery cell, and the case wall of the case is electrically connected to the positive electrode current collector as the positive electrode lead portion and is used for connection to a conductor outside the battery cell, or The top cover is electrically connected to the positive electrode current collector as the positive electrode lead portion and is used for connection to a conductor outside the battery cell, and the case wall of the case is electrically connected to the metal base as the negative electrode lead portion and is used for connection to a conductor outside the battery cell.

[0036] In the integrally molded negative electrode lead portion, the top cover is used as the negative electrode lead portion to electrically connect with the metal substrate and the external conductor, thereby providing a larger electrical connection area for the negative electrode lead portion, reducing internal resistance, and having a simpler structure and occupying less space, which is advantageous for further improving the battery capacity.The case wall is used as the positive electrode lead portion to connect the positive electrode current collector and the external conductor, thereby providing a larger electrical connection area for the positive electrode lead portion, reducing internal resistance, and facilitating connection to the external conductor.

[0037] Similarly, in the case of an integrally molded negative electrode lead portion, the case wall of the case is used as the negative electrode lead portion to electrically connect with the metal substrate and an external conductor, thereby providing a larger electrical connection area for the negative electrode lead portion, reducing internal resistance, and having a simpler structure and occupying less space, which is advantageous for further improving the battery capacity.The top cover is used as the positive electrode lead portion to connect the positive electrode current collector and the external conductor, thereby providing a larger electrical connection area for the positive electrode lead portion, reducing internal resistance, and facilitating connection to an external conductor.

[0038] In some embodiments, the housing includes a case, a first top cover, and a second top cover, each of opposite ends of the case having an end opening, and the first top cover and the second top cover are respectively fitted over and fixed to the end openings at the opposite ends of the case; wherein the first top cover is electrically connected to the metal base as the negative electrode lead portion and is used for connection to a conductor outside the battery cell, and the second top cover is electrically connected to the positive electrode current collector as the positive electrode lead portion and is used for connection to a conductor outside the battery cell, or The second top cover is electrically connected to the metal base as the negative electrode lead portion and is used for connection to a conductor external to the battery cell, and the first top cover is electrically connected to the positive electrode current collector as the positive electrode lead portion and is used for connection to a conductor external to the battery cell.

[0039] In the integrally molded negative electrode lead part, the first top cover is used as the negative electrode lead part to electrically connect the metal substrate and the external conductor, thereby providing a larger electrical connection area for the negative electrode lead part, reducing internal resistance, and having a simpler structure and occupying less space, which is advantageous for further improving the battery capacity.The second top cover is used as the positive electrode lead part to connect the positive electrode current collector and the external conductor, thereby providing a larger electrical connection area for the positive electrode lead part, reducing internal resistance, and facilitating connection to the external conductor.

[0040] Similarly, in the integrally molded negative electrode lead portion, the second top cover is used as the negative electrode lead portion to electrically connect the metal substrate and the external conductor, thereby providing a larger electrical connection area for the negative electrode lead portion, reducing internal resistance, and having a simpler structure and occupying less space, which is advantageous for further improving the battery capacity.The first top cover is used as the positive electrode lead portion to connect the positive electrode current collector and the external conductor, thereby providing a larger electrical connection area for the positive electrode lead portion, reducing internal resistance, and facilitating connection to the external conductor.

[0041] In some embodiments, the positive electrode active material includes at least one of a sodium-containing layered transition metal oxide, a sodium-containing phosphate, and a Prussian blue analog.

[0042] By employing a positive electrode active material containing at least one of a sodium-containing layered transition metal oxide, a sodium-containing phosphate, and a Prussian blue analogue, it is possible to realize reversible desorption / intercalation of sodium ions.

[0043] One aspect of the present disclosure provides a battery including the battery cell described above.

[0044] A battery using the above-described battery cells can reduce weight and cost.

[0045] In some embodiments, the battery includes a plurality of the battery cells and further includes a bus bar member for electrically connecting the plurality of battery cells, and a constituent material of the bus bar member includes an aluminum element having a mass percentage greater than that of other elements.

[0046] The electrical connection of the plurality of battery cells is achieved by employing a busbar member whose constituent material contains a larger mass percentage of aluminum than other elements, and the busbar member can be more easily and relatively reliably welded to the negative electrode lead portion whose constituent material contains a larger mass percentage of aluminum than other elements.

[0047] In some embodiments, the constituent material of the busbar member contains aluminum element in a mass percentage of 90% or more.

[0048] The busbar members are made of aluminum alloy material or pure aluminum material containing aluminum elements at a mass percentage of 90% or more, which makes it easier to achieve a reliable connection effect during connection processes such as welding.

[0049] One aspect of the present disclosure provides a power consuming device including a battery as described above.

[0050] The battery-based power consumption devices described above can reduce weight and cost.

[0051] In order to more clearly describe the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings that need to be used in the embodiments of the present disclosure. It is obvious that the drawings in the following description are only some embodiments of the present disclosure, and those skilled in the art can obtain other drawings based on the drawings without any creative efforts. [Brief explanation of the drawings]

[0052] The present disclosure can be more clearly understood based on the following detailed description, with reference to the drawings, in which: [Figure 1]1 is a structural schematic diagram of some embodiments of a power consuming device of the present disclosure. [Figure 2] 1 is an exploded schematic view of some embodiments of a battery of the present disclosure. [Figure 3] 1 is a schematic diagram of the connection of multiple battery cells according to some embodiments of the battery of the present disclosure. [Figure 4] 1A-1C are structural schematic diagrams of some embodiments of a battery cell of the present disclosure. [Figure 5] FIG. 5 is an exploded schematic view of the embodiment shown in FIG. 4. [Figure 6] FIG. 5 is a cross-sectional schematic view of the embodiment shown in FIG. [Figure 7] FIG. 2 is a schematic diagram illustrating the placement of positive and negative electrode plates and separator members included in an electrode assembly according to some embodiments of a battery cell of the present disclosure. [Figure 8] FIG. 2 is a cross-sectional schematic view of a negative electrode current collector according to some embodiments of a battery cell of the present disclosure. [Figure 9] FIG. 2 is a cross-sectional schematic view of a negative electrode current collector according to some other embodiments of a battery cell of the present disclosure. [Figure 10] FIG. 2 is a cross-sectional schematic view of a positive electrode current collector according to some embodiments of a battery cell of the present disclosure. [Figure 11] FIG. 2 is a cross-sectional schematic view of a positive electrode current collector according to some other embodiments of a battery cell of the present disclosure. [Figure 12] 1A-1C are cross-sectional schematic diagrams of some alternative embodiments of a battery cell of the present disclosure. [Figure 13] 1 is an exploded schematic view of some alternative embodiments of a battery of the present disclosure. [Figure 14] 10 is a schematic diagram of connections between multiple battery cells according to some other embodiments of the battery of the present disclosure. FIG. [Figure 15] 1A-1C are structural schematic diagrams of some other embodiments of a battery cell of the present disclosure. [Figure 16] FIG. 16 is an exploded schematic view of the embodiment shown in FIG. 15. [Figure 17] FIG. 16 is a cross-sectional schematic view of the embodiment shown in FIG. 15. [Figure 18] 10A-10C are structural schematic diagrams according to still some embodiments of the battery cell of the present disclosure. [Figure 19] FIG. 19 is an exploded schematic view of the embodiment shown in FIG. 18. [Figure 20] FIG. 19 is a cross-sectional schematic view of the embodiment shown in FIG. 18. [Figure 21] 20 is an exploded schematic view of another embodiment referring to FIG. 19. FIG. [Figure 22] 10A-10C are structural schematic diagrams according to some further embodiments of the battery cell of the present disclosure. [Figure 23] FIG. 23 is an exploded schematic view of the embodiment shown in FIG. 22. [Figure 24] FIG. 23 is a cross-sectional schematic view of the embodiment shown in FIG. 22. [Figure 25] 24 is an exploded schematic view of another embodiment of the present invention, referring to Fig. 23. It should be understood that the dimensions of each part shown in the drawings are not drawn to scale, and the same or similar reference numerals represent the same or similar parts. DETAILED DESCRIPTION OF THE INVENTION

[0053] In the following, embodiments of the present disclosure will be described in more detail in conjunction with drawings and examples. The detailed description of the examples and drawings are intended to exemplarily explain the principles of the present disclosure, but are not intended to limit the scope of the present disclosure, i.e., not to be limited to the described examples of the present disclosure.

[0054] In describing the present disclosure, it should be explained that, unless otherwise specified, "plurality" means two or more, and the orientations or positional relationships indicated by terms such as "up," "down," "left," "right," "inside," "outside," etc. are merely for ease of description and brevity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation or be configured and operated in a particular orientation, and should not be understood as limitations on the present disclosure. Furthermore, terms such as "first," "second," "third," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. "Perpendicular" does not mean perpendicular in the strict sense, but has a margin of error. "Parallel" does not mean parallel in the strict sense, but has a margin of error.

[0055] Any direction terms appearing in the following description refer to the directions shown in the drawings and do not limit the specific structure of the present disclosure. It should be further explained that in the description of the present disclosure, unless otherwise clearly defined or limited, the terms "attached," "connected," and "connected" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection, or may be a direct connection or an indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present disclosure according to the specific circumstances.

[0056] Some embodiments of the present disclosure will be described in detail below in conjunction with the drawings. Unless conflicting, the features in the following examples can be combined with each other.

[0057] The term "plurality" as it appears in this disclosure refers to two or more (including two).

[0058] In an embodiment of the present disclosure, the battery cell may be a secondary battery, which is a battery cell that can be continuously used by activating the active material in a charging manner after discharging the battery cell.

[0059] In related technology, lithium batteries use copper foil as the negative electrode current collector because it has good conductivity, is resistant to oxidation at low potential, and is resistant to alloying with Li. If copper foil is to be used in batteries based on sodium electric systems, its material cost must be further reduced.

[0060] In view of this, embodiments of the present disclosure provide a battery cell, a battery, and a power consuming device, which are advantageous in reducing the material cost of the battery cell.

[0061] In one aspect of the present disclosure, there is provided a battery cell including an electrode assembly, the electrode assembly including a positive electrode plate and a negative electrode plate, the positive electrode plate including a positive electrode current collector and a positive electrode active material disposed on the positive electrode current collector, the positive electrode active material including an active material capable of reversibly absorbing and releasing sodium ions, the negative electrode plate including a negative electrode current collector, and the negative electrode current collector including a metal substrate, wherein a constituent material of the metal substrate includes aluminum element, and the mass percentage of the aluminum element is greater than the mass percentage of each of the other elements.

[0062] In related art, lithium batteries use copper foil as the negative electrode current collector because it has good conductivity, is resistant to oxidation at low potential, and is resistant to alloying with Li. In contrast, in sodium electric systems, sodium and aluminum do not undergo alloying reactions at low potential, and aluminum is inexpensive. Therefore, aluminum alloys or metal aluminum, in which the mass percentage of aluminum element is higher than the mass percentages of other elements, can be selected as the metal substrate of the negative electrode current collector to replace copper foil, thereby reducing costs and weight.

[0063] 1 is a structural schematic diagram of some embodiments of a power consumption device of the present disclosure. For convenience of explanation, the power consumption device will be described as a vehicle. The vehicle 80 may be a gasoline-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, etc. A battery 70 may be installed at the bottom, front, or rear of the vehicle 80.

[0064] The battery 70 can be used to supply power to the vehicle 80, for example, the battery 70 can be used as an operating power source for the vehicle 80 and for circuit systems of the vehicle 80, such as for power consumption needs during startup, navigation, and operation of the vehicle 80. The battery 70 may be used as an operating power source for the vehicle 80 or as a driving power source for the vehicle 80, and may provide driving force to the vehicle 80 by replacing or partially replacing fuel oil or natural gas.

[0065] An axle, wheels, a motor 82, and a controller 81 may further be installed inside the vehicle 80, and the controller 81 is used to control the battery 70 to supply power to the motor 82. For example, when the vehicle 80 is driven by the battery 70, the controller 81 can provide the motor 82 with power necessary for constant speed and acceleration. The motor 82 is used to drive the rotation of the axle and rotate the wheels.

[0066] FIG. 2 is an exploded schematic diagram of some embodiments of a battery of the present disclosure. FIG. 3 is a schematic diagram of multiple battery cells connected together according to some embodiments of a battery of the present disclosure. Referring to FIGS. 2 and 3 , in some embodiments, a battery 70 includes a battery box and multiple battery cells 71 installed in the battery box. The battery box can provide functions such as housing, support, cooling, sealing, and collision prevention for the battery cells 71, and can also prevent external liquids or other foreign objects from adversely affecting the charging / discharging or safety of the battery cells. The battery box may include a housing 73 and a housing cover 74 that engages with the housing 73.

[0067] 3, the battery cells 71 may be electrically connected via busbar members 72, for example, in series, parallel, or series-parallel connection, thereby achieving required electrical performance parameters of the battery 70. The battery cells 71 are arranged in rows, and one or more rows of the battery cells 71 may be arranged in the housing as needed.

[0068] In some embodiments, the battery cells 71 of the battery 70 may be arranged along at least one of the length and width directions of the battery box. At least one row or one column of the battery cells 71 may be installed depending on actual needs. If necessary, the battery cells 71 may be installed in one or more layers in the height direction of the battery 70.

[0069] In some embodiments, a plurality of battery cells 71 may first be connected in series, parallel, or series-parallel to form a battery module, and then the plurality of battery modules may be connected in series, parallel, or series-parallel to form a whole and housed in a battery box. In other embodiments, all of the battery cells 71 may be directly connected in series, parallel, or series-parallel together, and then the whole consisting of all of the battery cells 71 may be housed in a battery box.

[0070] Figure 4 is a structural schematic diagram according to some embodiments of a battery cell of the present disclosure. Figure 5 is an exploded schematic diagram of the embodiment shown in Figure 4. Figure 6 is a cross-sectional schematic diagram of the embodiment shown in Figure 4. Figure 7 is an installation schematic diagram of a positive electrode plate, a negative electrode plate, and a separator member included in an electrode assembly according to some embodiments of a battery cell of the present disclosure.

[0071] 4 to 6, an embodiment of the present disclosure provides a battery cell 71 including an electrode assembly 10. Referring to Fig. 7, the electrode assembly 10 includes a positive electrode plate 11 and a negative electrode plate 12. The positive electrode plate 11 includes a positive electrode current collector 111 and a positive electrode active material 112 disposed on the positive electrode current collector 111. The positive electrode active material 112 includes an active material capable of reversibly absorbing and releasing sodium ions. The negative electrode plate 12 includes a negative electrode current collector 121. The negative electrode current collector 121 includes a metal substrate 121b. The metal substrate 121b includes aluminum, and the mass percentage of the aluminum is greater than the mass percentage of each of the other elements.

[0072] In this embodiment, the elements other than aluminum in the constituent material of the metal substrate may include one or more of copper, manganese, silicon, magnesium, zinc, nickel, iron, titanium, chromium, zirconium, cobalt, and rare earth elements, and may also include elements as impurities.

[0073] In a sodium electric system, sodium and aluminum do not undergo an alloying reaction at low potential, and aluminum is inexpensive. Therefore, an aluminum alloy or metallic aluminum, in which the mass percentage of aluminum element is higher than the mass percentages of other elements, is selected as the metal substrate 121b of the negative electrode current collector 121, replacing copper foil to form the substrate of the negative electrode current collector 121, thereby reducing the material cost and weight of the battery cell.

[0074] The mass percentage of aluminum element can be measured by a spectrometer, for example, a direct-reading spectrometer is used to measure the mass percentage of aluminum element in a sample. In one measurement example, the sample is placed on the excitation stage of a photoelectric direct-reading spectrometer, and the test surface of the sample is polished. The sample is then excited one or more times. The excitation light source on the excitation stage is used to excite the sample. A focusing lens and a linear motor are used to generate characteristic spectra for each element. The spectral lines of each element are automatically aligned by a diffraction grating spectroscope. The emission slit then passes through a photomultiplier tube, which converts the spectral lines into photocurrent. The photocurrent, elemental spectral intensity, and elemental content are used to determine the relationship between the photocurrent, elemental spectral intensity, and elemental content. Finally, data processing is performed to obtain the measured elemental content.

[0075] The positive electrode current collector 111 has two surfaces that face each other in the thickness direction thereof, and the positive electrode active material 112 is disposed on one or both of the two facing surfaces of the positive electrode current collector 111. In some embodiments, the positive electrode current collector may be a metal foil sheet or a composite current collector.

[0076] In this embodiment, the positive electrode active material may adopt an active material that can reversibly release and occlude sodium ions in a sodium electrical system known in the art.

[0077] In some embodiments, the positive electrode active material 112 includes at least one of sodium-containing layered transition metal oxides, sodium-containing phosphates, and Prussian blue analogs.

[0078] Optionally, the sodium-containing layered transition metal oxide includes a substance with the general formula NafMgFehO2, where M includes at least one of transition metal elements, 0.67 < f < 1.1, 0.5 < g < 1, and 0 < h < 0.5. For example, the sodium-containing layered transition metal oxide may be Na 0.88 Cu 0.24 Fe 0.29 Mn 0.47 O2.

[0079] Optionally, the sodium-containing phosphate includes a substance with the general formula Na e Me c (PO4) d O2X, where Me includes at least one of transition metal elements, X includes at least one of halogen elements, 0 < e ≦ 4, 0 < c ≦ 2, and 1 ≦ d ≦ 3. In some embodiments, the sodium-containing phosphate may be Na3V2(PO4)2O2F.

[0080] Optionally, the Prussian blue analog includes a substance with the general formula Na x P[R(CN)6]δ·zH2O, where P and R each independently include at least one of transition metal elements, 0 < x ≦ 2, 0 < δ ≦ 1, and 0 ≦ z ≦ 10. In some embodiments, the Prussian blue analog may be Na2Ni 0.17 Co 0.83 Fe(CN)6.

[0081] Optionally, the transition metal element includes at least one of Ti, Cr, Mn, Fe, Co, Ni, V, Cu, and Zn.

[0082] Optionally, the halogen element includes at least one of F, Cl, and Br.

[0083] In some embodiments, the positive electrode active material may be dispersed in a solvent with a conductive agent, an adhesive, and any other components to form a positive electrode slurry that is applied to the surface of the positive electrode current collector. For example, the adhesive may include at least one of polyvinylidene fluoride, polytetrafluoroethylene, vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, and a fluorine-containing acrylate resin. For example, the conductive agent may include at least one of superconducting carbon, acetylene black, carbon black, ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

[0084] 7, the negative electrode plate 12 includes a negative electrode current collector 121 and a negative electrode active material disposed on at least one surface of the negative electrode current collector 121. As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on one or both of the two facing surfaces of the negative electrode current collector. In other embodiments, no negative electrode active material is disposed on the negative electrode current collector.

[0085] In some embodiments, the negative electrode current collector may employ a metal foil sheet or a composite current collector.

[0086] In some embodiments, the negative electrode active material may be a battery negative electrode active material known in the art. For example, the negative electrode active material may include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate. The silicon-based material may be selected from at least one of silicon elemental, silicon oxide compounds, silicon carbon composites, silicon nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of tin elemental, stannate compounds, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination.

[0087] 5 and 6 , in some embodiments, the battery cell 71 further includes a housing 20 and a negative electrode lead portion 30. The housing 20 has a chamber that accommodates the electrode assembly 10. The negative electrode lead portion 30 is installed in the housing 20. The negative electrode lead portion 30 is used to electrically connect the metal substrate 121b and a conductor outside the battery cell 71.

[0088] The conductor external to the battery cell 71 may be a conductive part of a power consumption device or a conductive part of a charging device. Optionally, the external conductor may be a bus bar member for electrically connecting multiple battery cells. The negative electrode lead-out portion provides electrical connection between the metal substrate of the negative electrode plate and the conductor external to the battery cell, ensuring continuity between the internal and external components of the battery and thereby fulfilling the charging and discharging functions of the battery.

[0089] In some related art lithium-ion batteries, the positive and negative electrode current collectors are made of aluminum and copper, respectively. When such lithium-ion battery cells are connected to poles via busbar members (e.g., aluminum panels), welding copper and aluminum is relatively difficult (mainly because of the relatively large difference in melting points between them: copper is 1083.4°C and aluminum is 660°C). Considering this, a copper-aluminum composite pole structure is generally adopted, in which the copper pole portion of the copper-aluminum composite pole is connected to the copper negative electrode current collector, and the aluminum pole portion is welded to the aluminum panel to ensure reliable electrical connection. However, such a copper-aluminum composite structure is relatively complex to process and relatively expensive. Furthermore, electrochemical reactions can occur at the copper-aluminum connection points, increasing resistance at the contact locations.

[0090] Referring to FIG. 6 , in some embodiments, the negative electrode lead portion 30 has a separate structure and includes a negative electrode internal connection portion 31 and a negative electrode external connection portion 32 that are fixedly connected, the negative electrode internal connection portion 31 is electrically connected to the metal base 121b, and the negative electrode external connection portion 32 is used to connect to a conductor outside the battery cell 71, and both the constituent material of the negative electrode internal connection portion 31 and the constituent material of the negative electrode external connection portion 32 contain aluminum element, and the mass percentage of the aluminum element is greater than the mass percentage of each of the other elements.

[0091] In this embodiment, the elements other than aluminum in the constituent materials of the negative electrode internal connection part and the negative electrode external connection part may include one or more of copper, manganese, silicon, magnesium, zinc, nickel, iron, titanium, chromium, zirconium, cobalt, and rare earth elements, and may also include elements as impurities.

[0092] The negative electrode lead portion 30 is electrically connected to the negative electrode current collector 121 and is also connected to an external conductor using a negative electrode internal connection portion 31 and a negative electrode external connection portion 32, which contain a higher mass percentage of aluminum than other elements and are fixedly connected to each other. In contrast to the related art, which uses copper foil as the negative electrode current collector 121, which requires a relatively complex copper-aluminum composite post to be welded to the copper foil and aluminum bus bar member 72 on the inside and outside of the battery cell 71, the negative electrode lead portion 30 uses the negative electrode internal connection portion 31 and the negative electrode external connection portion 32, each of which is primarily aluminum, to respectively establish electrical connection with the aluminum negative electrode current collector 121 and the bus bar member 72 made of pure aluminum or an aluminum alloy, such as aluminum foil. This improves the connection reliability of fixed connection methods such as welding, while also further simplifying the structure of the negative electrode lead portion 30 and reducing the complexity and cost of processing.

[0093] In the embodiment in which the negative electrode internal connection part and the negative electrode external connection part are integrally formed, the integrally formed negative electrode lead part has good electrical conductivity and is advantageous in that it eliminates the need for a connection operation for the negative electrode internal connection part and the negative electrode external connection part, thereby saving process steps.

[0094] In some embodiments, the constituent material of the metal substrate 121b, the constituent material of the negative electrode internal connection part 31, and the constituent material of the negative electrode external connection part 32 all contain aluminum elements in a mass percentage of 90% or more.

[0095] The constituent material of the metal substrate 121b of the negative electrode current collector 121 and the constituent material of the negative electrode lead portion 30 are both aluminum alloy materials or pure aluminum materials containing aluminum elements at a mass percentage of 90% or more, thereby achieving better conductivity and reducing weight. Furthermore, because both constituent materials contain a relatively high content of aluminum elements, it is easier to achieve a reliable connection effect when performing connection processes such as welding.

[0096] 5 and 6, in some embodiments, the battery cell 71 further includes a negative electrode adapter 40. The negative electrode adapter 40 electrically connects the metal base 121b and the negative electrode lead portion 30. The constituent material of the negative electrode adapter 40 includes aluminum, and the mass percentage of the aluminum is greater than the mass percentage of each of the other elements.

[0097] In this embodiment, the elements other than aluminum in the constituent material of the negative electrode adapter may include one or more of copper, manganese, silicon, magnesium, zinc, nickel, iron, titanium, chromium, zirconium, cobalt, and rare earth elements, and may also include elements as impurities.

[0098] The negative electrode adapter 40 is installed to connect the metal base 121b of the negative electrode current collector 121 to the negative electrode lead portion 30. The constituent materials of the metal base 121b and the negative electrode lead portion 30 both contain aluminum elements in mass percentages greater than those of other elements. Therefore, the negative electrode adapter 40 can improve the connection reliability of fixed connection methods such as welding between the metal base 121b and the negative electrode lead portion 30, and can simplify the structure of the negative electrode adapter portion, reducing the complexity and cost of processing.

[0099] 5 and 6 , the negative electrode adapter 40 may be installed in a bent structure, thereby being welded to the negative electrode current collector 121 and the negative electrode internal connection portion 31 of the negative electrode lead portion 30, which are located in different directions of the electrode assembly. In other embodiments, the battery cell 71 may not include the negative electrode adapter 40, and the negative electrode current collector 121 is welded to the negative electrode internal connection portion 31 of the negative electrode lead portion 30.

[0100] In some embodiments, the material of the negative electrode adapter 40 includes aluminum element in a mass percentage of 90% or more.

[0101] The material of the metal substrate 121b of the negative electrode current collector 121, the material of the negative electrode adapter 40, and the material of the negative electrode lead-out portion 30 may all be an aluminum alloy material or a pure aluminum material containing an aluminum element by mass percentage of 90% or more, thereby achieving better conductivity and reducing weight. Furthermore, because all three materials contain a relatively high content of aluminum element, it is easier to achieve a reliable connection effect when performing a connection process such as welding.

[0102] 8 is a cross-sectional schematic diagram of a negative electrode current collector according to some embodiments of a battery cell of the present disclosure. Referring to FIGS. 7 and 8, the negative electrode current collector 121 is composed of the metal substrate 121b, and the constituent material of the metal substrate 121b contains aluminum element at a mass percentage of 99% or more.

[0103] The use of a negative electrode current collector 121 made of a material containing aluminum element in an overall mass percentage of 99% or more corresponds to a negative electrode current collector 121 in a form of pure aluminum foil or a form close to pure aluminum foil, which can achieve good electrical conductivity and relatively high plasticity and ductility, making it easy to form by methods such as winding, and accommodating expansion of the electrode assembly 10 during charging.

[0104] 9 is a schematic cross-sectional view of a negative electrode current collector according to some other embodiments of a battery cell of the present disclosure. Referring to FIG. 9, the negative electrode current collector 121 further includes a first insulating material layer 121i, and the metal substrates 121b are disposed on both sides of the first insulating material layer 121i in the thickness direction, and the constituent material of the metal substrates 121b contains aluminum element at a mass percentage of 99% or more.

[0105] The first insulating material layer 121i may be made of a polymeric material, such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc. The negative electrode current collector 121 has a layered composite structure, and metal substrates 121b made of a material containing 99% or more aluminum by mass are provided on both sides of the first insulating material layer 121i. This provides good electrical conductivity and relatively high plasticity, while further reducing the weight and improving the ductility and strength of the negative electrode current collector 121.

[0106] 4 to 6 , in some embodiments, the battery cell 71 further includes a housing 20 and a positive electrode lead 50. The housing 20 has a chamber that houses the electrode assembly 10. The positive electrode lead 50 is installed in the housing 20 and is used to electrically connect the positive electrode current collector 111 to a conductor outside the battery cell 71. The constituent material of the positive electrode lead 50 includes aluminum, and the mass percentage of the aluminum is greater than the mass percentage of each of the other elements.

[0107] In this example, the elements other than aluminum in the constituent material of the positive electrode lead portion may include one or more of copper, manganese, silicon, magnesium, zinc, nickel, iron, titanium, chromium, zirconium, cobalt, and rare earth elements, or may include elements as impurities.

[0108] The positive electrode lead portion, which is made of a material containing a larger mass percentage of aluminum than other elements, can be used to establish electrical connection with the positive electrode current collector and to connect to an external conductor. The positive electrode lead portion, which is mainly made of aluminum, establishes electrical connection between the aluminum positive electrode current collector and a busbar member made of pure aluminum or an aluminum alloy, such as an aluminum busbar, thereby improving the connection reliability of fixed connection methods such as welding, while further simplifying the structure of the positive electrode lead portion and reducing the complexity and cost of processing.

[0109] 6 , in some embodiments, the positive electrode lead-out portion 50 has a separate structure and includes a positive electrode internal connection portion 51 and a positive electrode external connection portion 52, and the positive electrode internal connection portion 51 is electrically connected to the positive electrode current collector 111. The positive electrode external connection portion 52 is used to connect to a conductor external to the battery cell 71, and the positive electrode external connection portion 52 is integrally formed with or in contact with the positive electrode internal connection portion 51 and is electrically connected thereto. The constituent materials of the positive electrode internal connection portion 51 and the positive electrode external connection portion 52 both contain aluminum, and the mass percentage of the aluminum element is greater than the mass percentage of each of the other elements.

[0110] In this embodiment, the elements other than aluminum in the constituent materials of the positive electrode internal connection part 51 and the positive electrode external connection part 52 may include one or more of copper, manganese, silicon, magnesium, zinc, nickel, iron, titanium, chromium, zirconium, cobalt, and rare earth elements, and may also include elements as impurities.

[0111] The positive electrode lead portion 50 employs a positive electrode internal connection portion 51 and a positive electrode external connection portion 52 whose constituent materials contain a greater mass percentage of aluminum than other elements to establish electrical connection with the positive electrode current collector 111 and can also be used for connection to an external conductor. The positive electrode lead portion 50 uses the positive electrode internal connection portion 51 and the positive electrode external connection portion 52, each of which is primarily aluminum, to establish electrical connection between the aluminum positive electrode current collector 111 and a bus bar member 72 made of pure aluminum or an aluminum alloy, such as an aluminum plate. This improves the connection reliability of fixed connection methods such as welding, while also further simplifying the structure of the positive electrode lead portion 50 and reducing the complexity and cost of processing.

[0112] In some embodiments, the material of the positive electrode lead portion 50 contains aluminum element in a mass percentage of 90% or more.

[0113] The positive electrode lead portion 50 is made of an aluminum alloy material or a pure aluminum material containing 90% or more by mass of aluminum, which makes it easier to achieve a reliable connection during a connection process such as welding. In addition, this positive electrode lead portion 50 has better electrical conductivity and is relatively light in weight.

[0114] 5 and 6 , in some embodiments, the battery cell 71 further includes a positive electrode adapter 60. The positive electrode adapter 60 is electrically connected to the positive electrode lead portion 50 and the positive electrode current collector 111. The constituent material of the positive electrode adapter 60 includes aluminum, and the mass percentage of the aluminum is greater than the mass percentage of each of the other elements.

[0115] In this embodiment, the elements other than aluminum in the constituent material of the positive electrode adapter may include one or more of copper, manganese, silicon, magnesium, zinc, nickel, iron, titanium, chromium, zirconium, cobalt, and rare earth elements, and may also include elements as impurities.

[0116] The positive electrode adapter 60 is installed to connect the positive electrode adapter 60 to the positive electrode current collector 111 and the positive electrode lead portion 50, respectively. The materials constituting the positive electrode adapter 60 and the positive electrode lead portion 50 both contain aluminum in a mass percentage greater than that of other elements. This improves the connection reliability of the positive electrode adapter 60 and the positive electrode lead portion 50 when they are fixedly connected by welding or other methods, and simplifies the structure of the positive electrode adapter portion, reducing the complexity and cost of processing.

[0117] In some embodiments, the material of the positive electrode adapter 60 includes aluminum element in a mass percentage of 90% or more.

[0118] The constituent materials of the positive electrode adapter 60 and the positive electrode lead portion 50 may both be aluminum alloy materials or pure aluminum materials containing aluminum elements at a mass percentage of 90% or more, thereby achieving better conductivity and reducing weight. Furthermore, because the constituent materials of the positive electrode adapter 60 and the positive electrode lead portion 50 both contain a relatively high content of aluminum elements, it is easier to achieve a reliable connection effect when performing connection processes such as welding.

[0119] 10 is a cross-sectional schematic diagram of a positive electrode current collector according to some embodiments of a battery cell of the present disclosure. Referring to FIGS. 7 and 10, in some embodiments, the positive electrode current collector 111 is a metal current collector, and the constituent material of the metal current collector contains aluminum element in a mass percentage of 99% or more.

[0120] The use of a positive electrode current collector 111 made of a material containing 99% or more aluminum by mass as a whole corresponds to a metal current collector in a form similar to or equivalent to pure aluminum foil, which can achieve good conductivity and relatively high plasticity, making it easy to form, for example, by winding, and accommodating expansion during charging of the electrode assembly 10. Furthermore, such a metal current collector does not require the use of a heterogeneous metal composite structure, and can be more easily connected to the positive electrode lead portion 50, simplifying the battery structure.

[0121] 11 is a cross-sectional schematic diagram of a positive electrode current collector according to some other embodiments of a battery cell of the present disclosure. Referring to FIGS. 7 and 11, in some embodiments, the positive electrode current collector 111 includes a second insulating material layer 111i and conductive layers 111c located on both sides of the second insulating material layer 111i in the thickness direction of the second insulating material layer 111i, and the constituent material of the conductive layer 111c includes aluminum element in a mass percentage of 99% or more.

[0122] The second insulating material layer 111i may be made of a polymeric material, such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene. The positive electrode current collector 111 has a layered composite structure, and conductive layers 111c made of a material containing 99% or more aluminum by mass are provided on both sides of the second insulating material layer 111i. This provides good conductivity and relatively high plasticity, while further reducing the weight and improving the ductility and strength of the positive electrode current collector 111. Furthermore, this conductive layer 111c does not require a heterogeneous metal composite structure, allowing for easier connection to the positive electrode lead portion 50 and simplifying the battery structure.

[0123] 3 to 6 show several embodiments of a rectangular battery cell 71, in which the electrode assembly 10 protrudes from the portion of the negative electrode current collector 121 that is not covered by the negative electrode active material 122 (i.e., the negative electrode tab) and the portion of the positive electrode current collector 111 that is not covered by the positive electrode active material 112 (i.e., the positive electrode tab) at both ends in the first direction dr1. The negative electrode lead portion 30 and the positive electrode lead portion 50 are located on the same side of the electrode assembly 10 in the third direction dr3.

[0124] In Figure 5, the first direction dr1 and the second direction dr2 are perpendicular to each other and are both perpendicular to the third direction dr3. The case 21 of the housing 20 has an end opening on one side in the third direction dr3. The second direction dr2 is parallel to the thickness direction of the electrode assembly 10. The negative electrode tab and the positive electrode tab are located at both ends of the electrode assembly 10 along the first direction dr1.

[0125] The negative electrode lead portion 30 has the negative electrode tab welded to the negative electrode internal connection portion 31 of the negative electrode lead portion 30 via the bent negative electrode adapter 40, and the negative electrode external connection portion 32 of the negative electrode lead portion 30 is located on one side of the negative electrode internal connection portion 31 away from the electrode assembly 10 and is used for electrical connection to an external conductor. The positive electrode lead portion 50 has the positive electrode tab welded to the positive electrode internal connection portion 51 of the positive electrode lead portion 50 via the bent positive electrode adapter 60, and the positive electrode external connection portion 52 of the positive electrode lead portion 50 is located on one side of the positive electrode internal connection portion 51 away from the electrode assembly 10 and is used for electrical connection to an external conductor.

[0126] FIG. 12 is a cross-sectional schematic diagram of some other embodiments of a battery cell according to the present disclosure. FIG. 12 shows the cross-sectional structure of some other embodiments of a prismatic battery cell. The same end of the electrode assembly 10 in the third direction dr3 protrudes from the portion of the negative electrode current collector 121 that is not covered by the negative electrode active material 122 (i.e., the negative electrode tab) and the portion of the positive electrode current collector 111 that is not covered by the positive electrode active material 112 (i.e., the positive electrode tab). The negative electrode lead portion 30 and the positive electrode lead portion 50 are also located on the same side of the electrode assembly 10 in the third direction dr3 and are adjacent to the negative electrode tab and the positive electrode tab. The negative electrode adapter 40 is welded to the negative electrode tab and the negative electrode lead portion 30, respectively. The positive electrode adapter 60 is welded to the positive electrode tab and the positive electrode lead portion 50, respectively.

[0127] Referring to FIG. 12 , in some embodiments, the negative electrode lead portion 30 has an integrally molded structure, and the constituent material of the negative electrode lead portion 30 contains aluminum element, and the mass percentage of the aluminum element is greater than the mass percentage of each of the other elements.

[0128] In this embodiment, the elements other than aluminum in the constituent material of the negative electrode pull-out portion having an integrally molded structure may include one or more of copper, manganese, silicon, magnesium, zinc, nickel, iron, titanium, chromium, zirconium, cobalt, and rare earth elements, and may also include elements as impurities.

[0129] The integrally molded negative electrode lead portion 30 is entirely composed of aluminum, with the mass percentage of aluminum being greater than the mass percentages of the other elements. The battery cell uses this negative electrode lead portion 30 to establish electrical connection between the negative electrode current collector and an external conductor. In contrast to related art techniques that use copper foil as the negative electrode current collector, which requires a relatively complex copper-aluminum composite post to be welded to copper foil and aluminum busbars on the inside and outside of the battery cell, the negative electrode lead portion 30, primarily composed of aluminum, can establish electrical connection with the aluminum negative electrode current collector and busbars made of pure aluminum or aluminum alloys, such as aluminum foil. This improves the connection reliability of fixed connection methods such as welding, while also simplifying the structure of the negative electrode lead portion 30 and reducing processing complexity and costs.

[0130] In some embodiments, the constituent material of the metal base 121b and the constituent material of the negative electrode lead portion 30 each contain aluminum element in a mass percentage of 90% or more.

[0131] The constituent material of the metal substrate of the negative electrode current collector and the constituent material of the negative electrode lead portion are both aluminum alloy materials or pure aluminum materials containing aluminum elements at a mass percentage of 90% or more, thereby achieving better conductivity and reducing weight. Furthermore, because both constituent materials contain relatively high amounts of aluminum elements, it is easier to achieve a reliable connection effect when performing connection processes such as welding.

[0132] To facilitate attachment of the negative electrode lead portion 30, the negative electrode lead portion 30 is fixed to one side of the top cover 22 of the housing 20 away from the electrode assembly 10, and a protrusion that passes through a through-hole on the top cover 22 is formed on the negative electrode adapter 40 and welded to the negative electrode lead portion 30.

[0133] 12 , in some embodiments, the positive electrode lead portion 50 has an integrally molded structure. Such an integrally molded positive electrode lead portion has good electrical conductivity and is advantageous in that it eliminates the need for connecting the positive electrode internal connection portion and the positive electrode external connection portion, thereby saving process steps. Accordingly, the constituent material of the positive electrode lead portion 50 includes aluminum, and the mass percentage of the aluminum is greater than the mass percentages of the other elements. Optionally, the constituent material of the positive electrode lead portion 50 includes aluminum in a mass percentage of 90% or more.

[0134] In this example, the elements other than aluminum in the constituent material of the positive electrode lead portion may include one or more of copper, manganese, silicon, magnesium, zinc, nickel, iron, titanium, chromium, zirconium, cobalt, and rare earth elements, or may include elements as impurities.

[0135] To facilitate attachment of the positive electrode lead portion 50, the positive electrode lead portion 50 is fixed to one side of the top cover 22 of the housing 20 away from the electrode assembly 10, and a protrusion that passes through a through-hole on the top cover 22 is formed on the positive electrode adapter 60 and welded to the positive electrode lead portion 50.

[0136] Fig. 13 is an exploded schematic view of some other embodiments of a battery of the present disclosure. Fig. 14 is a schematic view of connections between multiple battery cells of some other embodiments of a battery of the present disclosure. Fig. 15 is a structural schematic view of some other embodiments of a battery cell of the present disclosure. Referring to Figs. 13-15, in some embodiments, the battery cell embodiments described above are also applicable to a cylindrical battery cell 71.

[0137] 13, a battery 70 includes a battery box and a plurality of battery cells 71 installed in the battery box. The battery box can accommodate, support, cool, seal, and prevent collisions for the battery cells 71, and can also prevent external liquids or other foreign objects from adversely affecting the charging / discharging or safety of the battery cells. The battery box may include a housing 73 and a housing cover 74 that engages with the housing 73.

[0138] 14, the battery cells 71 may be electrically connected via busbar members 72, for example, in series, parallel, or series-parallel connection, thereby achieving the required electrical performance parameters of the battery 70. The battery cells 71 are arranged in a row, and one or more rows of the battery cells 71 may be arranged in the housing as needed. The battery cells 71 may be arranged in one or more layers in the height direction of the battery 70 as needed.

[0139] FIG. 16 is an exploded schematic view of the embodiment shown in FIG. 15 . FIG. 17 is a cross-sectional schematic view of the embodiment shown in FIG. 15 . Referring to FIGS. 15 to 17 , the housing 20 may include a cylindrical case 21 and an open-ended top cover 22 located at one end of the case 21. A positive electrode lead-out portion 50 is attached to the top cover 22. The positive electrode lead-out portion 50 may be a separate structure, and includes a positive electrode internal connection portion 51 located within the case 21 and partially protruding from a through-hole on the top cover 22, and a positive electrode external connection portion 52 located outside the case 21 and fixedly connected to the positive electrode internal connection portion 51. The positive electrode internal connection portion 51 may be welded to the positive electrode current collector 111 of the electrode assembly 10 via a positive electrode adapter 60.

[0140] The negative electrode lead portion 30 may have an integrally molded structure or a separate structure. For example, the case 21 may be welded to the negative electrode current collector 121 of the electrode assembly 10 via the negative electrode adapter 40 as a negative electrode lead portion 30 having an integrally molded structure. Alternatively, for example, the negative electrode lead portion 30 may include an integrally assembled case 21 and a top cover 22 electrically connected thereto. Accordingly, the case 21 serves as the negative electrode internal connection portion of the negative electrode lead portion 30, and the top cover 22 serves as the negative electrode external connection portion of the negative electrode lead portion 30, and is insulated and isolated from the positive electrode lead portion 50.

[0141] In other embodiments, the negative electrode lead portion 30 may be attached to the top cover 22, and the case 21 may be an integrally molded positive electrode lead portion 50, or the case 21 and the top cover 22 electrically connected thereto may be respectively a positive electrode internal connection portion and a positive electrode external connection portion of the separate positive electrode lead portion 50. In still other embodiments, both the positive electrode lead portion 50 and the negative electrode lead portion 30 may be attached to the top cover 22.

[0142] Figure 18 is a structural schematic diagram of some further embodiments of a battery cell of the present disclosure. Figure 19 is an exploded schematic diagram of the embodiment shown in Figure 18. Figure 20 is a cross-sectional schematic diagram of the embodiment shown in Figure 18. Figures 18-20 show another embodiment of a cylindrical battery cell.

[0143] 18-20 , in some embodiments, the housing 20 includes a case 21 and a top cover 22, one end of the case 21 has an end opening, and the top cover 22 is fixed to cover the end opening, wherein the top cover 22 is electrically connected to the positive electrode current collector 111 as the positive electrode lead portion 50 and is used for connecting to a conductor outside the battery cell 71, and the case wall of the case 21 is electrically connected to the metal base 121b as the negative electrode lead portion 30 and is used for connecting to a conductor outside the battery cell 71.

[0144] In the integrally molded negative electrode lead portion, the case wall of the case is used as the negative electrode lead portion to electrically connect with the metal substrate and an external conductor, thereby providing a larger electrical connection area for the negative electrode lead portion, reducing internal resistance, and having a simpler structure and occupying less space, which is advantageous for further improving the battery capacity.The top cover is used as the positive electrode lead portion to connect the positive electrode current collector and the external conductor, thereby providing a larger electrical connection area for the positive electrode lead portion, reducing internal resistance, and facilitating connection to an external conductor.

[0145] 21 is an exploded schematic view of another embodiment shown in FIG. 21. Compared to the embodiment shown in FIG. 19, the housing 20 includes a case 21 and a top cover 22. One end of the case 21 has an end opening, and the top cover 22 is fitted over and fixed to the end opening. The top cover 22 is electrically connected to the metal base 121b as the negative electrode lead portion 30 and is used for connecting to a conductor external to the battery cell 71, and the case wall of the case 21 is electrically connected to the positive electrode current collector 111 as the positive electrode lead portion 50 and is used for connecting to a conductor external to the battery cell 71.

[0146] In the integrally molded negative electrode lead portion, the top cover is used as the negative electrode lead portion to electrically connect with the metal substrate and the external conductor, thereby providing a larger electrical connection area for the negative electrode lead portion, reducing internal resistance, and having a simpler structure and occupying less space, which is advantageous for further improving the battery capacity.The case wall is used as the positive electrode lead portion to connect the positive electrode current collector and the external conductor, thereby providing a larger electrical connection area for the positive electrode lead portion, reducing internal resistance, and facilitating connection to the external conductor.

[0147] Figure 22 is a structural schematic diagram of some further embodiments of the battery cell of the present disclosure. Figure 23 is an exploded schematic diagram of the embodiment shown in Figure 22. Figure 24 is a cross-sectional schematic diagram of the embodiment shown in Figure 22. Figures 22-24 show yet another embodiment of a cylindrical battery cell.

[0148] 22 to 24 , in some embodiments, the housing 20 includes a case 21, a first top cover 22a, and a second top cover 22b, each of which has an end opening at each opposing end of the case 21, and the first top cover 22a and the second top cover 22b are respectively fitted over and fixed to the end openings at each opposing end of the case 21. The second top cover 22b is electrically connected to the metal base 121b as the negative electrode lead portion 30 and is used for connecting to a conductor external to the battery cell 71, and the first top cover 22a is electrically connected to the positive electrode current collector 111 as the positive electrode lead portion 50 and is used for connecting to a conductor external to the battery cell 71.

[0149] In the integrally molded negative electrode lead part, the second top cover is used as the negative electrode lead part to electrically connect the metal substrate and the external conductor, thereby providing a larger electrical connection area for the negative electrode lead part, reducing internal resistance, and having a simpler structure and occupying less space, which is advantageous for further improving the battery capacity.The first top cover is used as the positive electrode lead part to connect the positive electrode current collector and the external conductor, thereby providing a larger electrical connection area for the positive electrode lead part, reducing internal resistance, and facilitating connection to the external conductor.

[0150] 25 is an exploded schematic view of another embodiment shown in FIG. 23. Referring to FIG. 25, compared to the embodiment shown in FIG. 23, the housing 20 includes a case 21, a first top cover 22a, and a second top cover 22b. Opposing ends of the case 21 each have an end opening, and the first top cover 22a and the second top cover 22b are respectively fitted over and fixed to the end openings at the opposing ends of the case 21. The first top cover 22a is electrically connected to the metal base 121b as the negative electrode lead portion 30 and is used for connecting to a conductor external to the battery cell 71, and the second top cover 22b is electrically connected to the positive electrode current collector 111 as the positive electrode lead portion 50 and is used for connecting to a conductor external to the battery cell 71.

[0151] In the integrally molded negative electrode lead part, the first top cover is used as the negative electrode lead part to electrically connect the metal substrate and the external conductor, thereby providing a larger electrical connection area for the negative electrode lead part, reducing internal resistance, and having a simpler structure and occupying less space, which is advantageous for further improving the battery capacity.The second top cover is used as the positive electrode lead part to connect the positive electrode current collector and the external conductor, thereby providing a larger electrical connection area for the positive electrode lead part, reducing internal resistance, and facilitating connection to the external conductor.

[0152] In one aspect of the present disclosure, a battery 70 is provided that includes a battery cell 71 according to any one of the above-described embodiments.

[0153] A battery using the above-described battery cells can reduce weight and cost.

[0154] Referring to Figures 2, 3, 13, and 14, in some embodiments, the battery 70 includes a plurality of the battery cells 71 and further includes busbar members 72 for electrically connecting the plurality of battery cells 71, and the constituent material of the busbar members 72 includes aluminum elements having a mass percentage greater than that of other elements.

[0155] In this embodiment, the elements other than aluminum in the constituent material of the busbar member 72 may include one or more of copper, manganese, silicon, magnesium, zinc, nickel, iron, titanium, chromium, zirconium, cobalt, and rare earth elements, and may also include elements as impurities.

[0156] The busbar member 72 is made of a material containing a larger mass percentage of aluminum than other elements to achieve electrical connection between the plurality of battery cells 71, and the busbar member 72 can be more easily and relatively reliably welded to the negative electrode lead portion 30 made of a material containing a larger mass percentage of aluminum than other elements. The busbar member 72 may serve as an external conductor for the battery cells 71 and be electrically connected to at least one of the negative electrode lead portion and the positive electrode lead portion of the battery cells 71.

[0157] In some embodiments, the material of the busbar member 72 contains aluminum with a mass percentage of 90% or more.

[0158] The busbar members 72 are made of an aluminum alloy material or pure aluminum material containing aluminum elements at a mass percentage of 90% or more, which makes it easier to achieve a reliable connection effect during connection processes such as welding.

[0159] One aspect of the present disclosure provides a power consuming device including a battery 70 according to any one of the embodiments described above.

[0160] The battery-based power consumption devices described above can reduce weight and cost.

[0161] In some specific embodiments, as shown in FIGS. 4-8 and 10 , a battery cell 71 includes an electrode assembly 10, a rectangular box-shaped housing 20, a negative electrode lead 30, a negative electrode adapter 40, a positive electrode lead 50, and a positive electrode adapter 60. The electrode assembly 10 includes a positive electrode plate 11 and a negative electrode plate 12. The positive electrode plate 11 includes a positive electrode current collector 111 and a positive electrode active material 112 disposed on the positive electrode current collector 111. The negative electrode plate 12 includes a negative electrode current collector 121 and a negative electrode active material 122 disposed on the negative electrode current collector 121. The positive electrode active material 112 includes at least one of a sodium-containing layered transition metal oxide, a sodium-containing phosphate, and a Prussian blue analog. The negative electrode current collector 121 is formed of the metal substrate 121b, and the positive electrode current collector 111 is a metal current collector.

[0162] The housing 20 includes a case 21 and a top cover 22 that is installed at an end opening of the case 21. The negative electrode drawn portion 30 and the positive electrode drawn portion 50 are both installed in the top cover 22. One end of the negative electrode adapter 40 is welded to the negative electrode drawn portion 30, and the other end is welded to the negative electrode current collector 121. One end of the positive electrode adapter 60 is welded to the positive electrode drawn portion 50, and the other end is welded to the positive electrode current collector 111.

[0163] The negative electrode lead-out portion 30 has a separate structure and includes a negative electrode internal connection portion 31 located inside the top cover 22, and a negative electrode external connection portion 32 connected to the negative electrode internal connection portion 31 and located outside the top cover 22. The positive electrode lead-out portion 50 has a separate structure and includes a positive electrode internal connection portion 51 located inside the top cover 22, and a positive electrode external connection portion 52 connected to the positive electrode internal connection portion 51 and located outside the top cover 22.

[0164] The negative electrode internal connection part 31, the negative electrode external connection part 32, the negative electrode adapter 40, the positive electrode internal connection part 51, the positive electrode external connection part 52, and the positive electrode adapter 60 are all made of an aluminum alloy material or pure aluminum material with a mass percentage of 90% or more of aluminum element. The metal substrate 121b of the negative electrode current collector 121 and the positive electrode current collector 111 are all made of a pure aluminum material with a mass percentage of 99% or more of aluminum element. The bus bar members 72 used to connect the battery cells 71 are also made of an aluminum alloy material or pure aluminum material with a mass percentage of 90% or more of aluminum element.

[0165] In some specific embodiments, as shown in FIGS. 8 , 10 , 18 - 20 , a battery cell 71 includes an electrode assembly 10, a cylindrical housing 20, a negative electrode lead 30, a negative electrode adapter 40, a positive electrode lead 50, and a positive electrode adapter 60. The electrode assembly 10 includes a positive electrode plate 11 and a negative electrode plate 12. The positive electrode plate 11 includes a positive electrode current collector 111 and a positive electrode active material 112 disposed on the positive electrode current collector 111. The negative electrode plate 12 includes a negative electrode current collector 121 and a negative electrode active material 122 disposed on the negative electrode current collector 121. The positive electrode active material 112 includes at least one of a sodium-containing layered transition metal oxide, a sodium-containing phosphate, and a Prussian blue analog. The negative electrode current collector 121 is formed of the metal substrate 121b, and the positive electrode current collector 111 is a metal current collector.

[0166] The housing 20 includes a case 21 serving as the negative electrode lead-out portion 30, and a top cover 22 installed at an end opening of the case 21 and serving as the positive electrode lead-out portion 50, with the top cover 22 and the case 21 being insulated and isolated by an insulating member. One end of the negative electrode adapter 40 is welded to the negative electrode current collector 121, and the other end is welded to the bottom of the case wall of the case 21. One end of the positive electrode adapter 60 is welded to the top cover 22, and the other end is welded to the positive electrode current collector 111.

[0167] The case 21, negative electrode adapter 40, top cover 22, and positive electrode adapter 60 are all made of aluminum alloy material or pure aluminum material with a mass percentage of aluminum of 90% or more. The metal base 121b of the negative electrode current collector 121 and the positive electrode current collector 111 are all made of pure aluminum material with a mass percentage of aluminum of 99% or more. The bus bar members 72 used to connect the battery cells 71 are also made of aluminum alloy material or pure aluminum material with a mass percentage of aluminum of 90% or more.

[0168] 9, 11, and 22-24, a battery cell 71 includes an electrode assembly 10, a cylindrical housing 20, a negative electrode lead 30, a negative electrode adapter 40, a positive electrode lead 50, and a positive electrode adapter 60. The electrode assembly 10 includes a positive electrode plate 11 and a negative electrode plate 12. The positive electrode plate 11 includes a positive electrode current collector 111 and a positive electrode active material 112 disposed on the positive electrode current collector 111. The negative electrode plate 12 includes a negative electrode current collector 121 and a negative electrode active material 122 disposed on the negative electrode current collector 121. The positive electrode active material 112 includes at least one of a sodium-containing layered transition metal oxide, a sodium-containing phosphate, and a Prussian blue analog.

[0169] The negative electrode current collector 121 includes a metal substrate 121b and a first insulating material layer 121i, and the metal substrates 121b are disposed on both sides of the first insulating material layer 121i in the thickness direction. The positive electrode current collector 111 includes a second insulating material layer 111i and conductive layers 111c located on both sides of the second insulating material layer 111i in the thickness direction.

[0170] The housing 20 includes a case 21 and a first top cover 22a and a second top cover 22b that are installed in end openings at both ends of the case 21 and serve as a positive electrode lead portion 50 and a negative electrode lead portion 30, respectively. The first top cover 22a and the second top cover 22b are insulated and isolated from the case 21 by insulating members. One end of the negative electrode adapter 40 is welded to the negative electrode current collector 121, and the other end is welded to the second top cover 22b. One end of the positive electrode adapter 60 is welded to the first top cover 22a, and the other end is welded to the positive electrode current collector 111.

[0171] The second top cover 22b, the negative electrode adapter 40, the first top cover 22a, and the positive electrode adapter 60 are all made of an aluminum alloy material or pure aluminum material with a mass percentage of aluminum of 90% or more. The metal base 121b of the negative electrode current collector 121 and the conductive layer 111c of the positive electrode current collector 111 are all made of a pure aluminum material with a mass percentage of aluminum of 99% or more. The bus bar members 72 used to connect the battery cells 71 are also made of an aluminum alloy material or pure aluminum material with a mass percentage of aluminum of 90% or more.

[0172] Although the present disclosure has been described with reference to preferred embodiments, various modifications may be made thereto and elements therein may be replaced with equivalents without departing from the scope of the present disclosure. In particular, unless there is a structural conflict, the technical features recited in each embodiment may be combined in any manner. The present disclosure is not limited to the specific embodiments disclosed in the specification, but includes all technical solutions falling within the scope of the claims. [Explanation of symbols]

[0173] 10 - electrode assembly, 11 - positive electrode plate, 111 - positive electrode current collector, 111i - second insulating material layer, 111c - conductive layer, 112 - positive electrode active material, 12 - negative electrode plate, 121 - negative electrode current collector, 121b - metal substrate, 121i - first insulating material layer, 13 - separator member, 20—housing; 21—case; 22—top cover; 22a—first top cover; 22b—second top cover; 30—negative electrode lead portion; 31—negative electrode internal connection portion; 32—negative electrode external connection portion; 40- Negative adapter, 50 - positive electrode lead-out portion, 51 - positive electrode internal connection portion, 52 - positive electrode external connection portion, 60- Positive adapter, 70 - battery, 71 - battery cell, 72 - busbar member, 73 - housing, 74 - housing cover, 80- vehicle, 81- controller, 82- motor.

Claims

1. A battery cell (71), The battery includes an electrode assembly (10) having a positive electrode plate (11) and a negative electrode plate (12), wherein the positive electrode plate (11) includes a positive electrode current collector (111) and a positive electrode active material (112) disposed on the positive electrode current collector (111), the positive electrode active material (112) including an active material capable of reversibly absorbing and releasing sodium ions, the negative electrode plate (12) including a negative electrode current collector (121), the negative electrode current collector (121) including a metal substrate (121b), The battery cell (71) is a battery cell in which the constituent material of the metal substrate (121b) contains aluminum elements, and the mass percentage of the aluminum elements is greater than the mass percentage of each of the other elements.

2. a housing (20) having a chamber for receiving the electrode assembly (10); 2. The battery cell (71) according to claim 1, further comprising a negative electrode lead portion (30) installed in the housing (20) for electrically connecting the metal base (121b) to a conductor external to the battery cell (71).

3. 3. The battery cell according to claim 2, wherein the negative electrode lead portion has an integrally molded structure, the constituent material of the negative electrode lead portion includes aluminum, and the mass percentage of the aluminum is greater than the mass percentage of each of the other elements.

4. 4. The battery cell (71) according to claim 3, wherein the constituent material of the metal substrate (121b) and the constituent material of the negative electrode lead portion (30) each contain aluminum elements in a mass percentage of 90% or more.

5. 3. The battery cell according to claim 2, wherein the negative electrode lead portion (30) has a separate structure, includes a negative electrode internal connection portion (31) and a negative electrode external connection portion (32) that are fixedly connected, the negative electrode internal connection portion (31) is electrically connected to the metal base (121b), and the negative electrode external connection portion (32) is used for connection to a conductor outside the battery cell (71), and both the constituent material of the negative electrode internal connection portion (31) and the constituent material of the negative electrode external connection portion (32) contain aluminum elements, and the mass percentage of the aluminum elements is greater than the mass percentages of the other elements.

6. 6. The battery cell (71) according to claim 5, wherein the constituent material of the metal substrate (121b), the constituent material of the negative electrode internal connection portion (31), and the constituent material of the negative electrode external connection portion (32) all contain aluminum elements at a mass percentage of 90% or more.

7. The battery further includes a negative electrode adapter (40) that electrically connects the metal substrate (121b) and the negative electrode lead portion, 7. The battery cell (71) according to claim 2, wherein the material of the negative electrode adapter (40) contains aluminum, and the mass percentage of the aluminum is greater than the mass percentage of each of the other elements.

8. The battery cell (71) according to claim 7, wherein the material of the negative electrode adapter (40) contains aluminum element at a mass percentage of 90% or more.

9. 9. The battery cell (71) according to claim 1, wherein the negative electrode current collector (121) is made of the metal substrate (121b), and the constituent material of the metal substrate (121b) contains aluminum element in a mass percentage of 99% or more.

10. 9. The battery cell (71) according to claim 1, wherein the negative electrode current collector (121) further includes a first insulating material layer (121i), the metal substrate (121b) is provided on each side of the first insulating material layer (121i) in a thickness direction, and the constituent material of the metal substrate (121b) contains aluminum element in a mass percentage of 99% or more.

11. a housing (20) having a chamber for receiving the electrode assembly (10); The battery further includes a positive electrode lead-out portion (50) disposed in the housing (20) for electrically connecting the positive electrode current collector (111) to a conductor external to the battery cell (71), 11. The battery cell (71) according to claim 1, wherein the constituent material of the positive electrode lead portion (50) contains aluminum, and the mass percentage of the aluminum is greater than the mass percentage of each of the other elements.

12. The battery cell (71) according to claim 11, wherein the constituent material of the positive electrode lead portion (50) contains aluminum element at a mass percentage of 90% or more.

13. The positive electrode adapter (60) is electrically connected to the positive electrode lead portion (50) and the positive electrode current collector (111), 13. The battery cell (71) according to any one of claims 11 to 12, wherein the constituent material of the positive electrode adapter (60) contains aluminum, and the mass percentage of the aluminum is greater than the mass percentage of each of the other elements.

14. The battery cell (71) according to claim 13, wherein the material of the positive electrode adapter (60) contains aluminum element at a mass percentage of 90% or more.

15. 15. The battery cell (71) according to claim 11, wherein the positive electrode current collector (111) is a metal current collector, and a constituent material of the metal current collector contains aluminum element in a mass percentage of 99% or more.

16. 15. The battery cell according to claim 11, wherein the positive electrode current collector includes a second insulating material layer and conductive layers located on both sides of the second insulating material layer in a thickness direction of the second insulating material layer, and the conductive layers are made of a material containing aluminum at a mass percentage of 99% or more.

17. The housing (20) includes a case (21) and a top cover (22), one end of the case (21) has an end opening, and the top cover (22) is fixed to cover the end opening. The top cover (22) is electrically connected to the metal base (121b) as the negative electrode lead portion (30) and is used to be connected to a conductor outside the battery cell (71), and the case wall of the case (21) is electrically connected to the positive electrode current collector (111) as the positive electrode lead portion (50) and is used to be connected to a conductor outside the battery cell (71), or 5. The battery cell (71) according to claim 3, wherein the top cover (22) is electrically connected to the positive electrode current collector (111) as the positive electrode lead portion (50) and is used for connection to a conductor outside the battery cell (71), and the case wall of the case (21) is electrically connected to the metal base (121b) as the negative electrode lead portion (30) and is used for connection to a conductor outside the battery cell (71).

18. The housing (20) includes a case (21), a first top cover (22a), and a second top cover (22b), and both opposing ends of the case (21) have end openings, and the first top cover (22a) and the second top cover (22b) are respectively fitted over and fixed to the end openings at both opposing ends of the case (21), The first top cover (22a) is electrically connected to the metal base (121b) as the negative electrode lead portion (30) and is used to be connected to a conductor outside the battery cell (71), and the second top cover (22b) is electrically connected to the positive electrode current collector (111) as the positive electrode lead portion (50) and is used to be connected to a conductor outside the battery cell (71), or 5. The battery cell (71) according to claim 3, wherein the second top cover (22b) is electrically connected to the metal base (121b) as the negative electrode lead portion (30) and is used for connection to a conductor external to the battery cell (71), and the first top cover (22a) is electrically connected to the positive electrode current collector (111) as the positive electrode lead portion (50) and is used for connection to a conductor external to the battery cell (71).

19. 19. The battery cell (71) of any one of claims 1 to 18, wherein the positive electrode active material (112) includes at least one of a sodium-containing layered transition metal oxide, a sodium-containing phosphate, and a Prussian blue analog.

20. A battery (70) comprising a battery cell (71) according to any one of claims 1 to 19.

21. 21. The battery (70) according to claim 20, wherein the battery (70) includes a plurality of the battery cells (71) and further includes a busbar member (72) for electrically connecting the plurality of battery cells (71), and the constituent material of the busbar member (72) includes an aluminum element having a mass percentage greater than that of other elements.

22. 22. The battery (70) of claim 21, wherein the constituent material of the busbar member (72) contains aluminum element at a mass percentage of 90% or more.

23. 23. A power consuming device comprising a battery (70) according to any one of claims 20 to 22.

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