Battery module and electric equipment

Abstract

The utility model relates to the technical field of batteries, and discloses a battery module and electric equipment, which comprises a shell, a plurality of aluminum foils and a plurality of isolating membranes, an isolating membrane is arranged between every two adjacent aluminum foils; in the two aluminum foils at the two ends, one surface, facing the adjacent aluminum foil, of one aluminum foil is provided with positive electrode slurry, and one surface, facing the adjacent aluminum foil, of the other aluminum foil is provided with negative electrode slurry; in two opposite surfaces of the other aluminum foils in the middle, positive electrode slurry is arranged on one surface, and negative electrode slurry is arranged on the other surface; and the polarities of the slurry arranged on the opposite surfaces of every two adjacent aluminum foils are different. According to the utility model, the plurality of aluminum foils and the plurality of isolating membranes are laminated, the aluminum foil positioned at one end is designed to be a single-sided unipolar pole piece, the aluminum foil positioned at the other end is designed to be a single-sided unipolar pole piece, and the aluminum foils positioned in the middle are all designed to be pole pieces with double-sided different polarities, so that a tandem type battery can be assembled; the voltage performance of a single battery is improved, and wide application of the sodium ion battery is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery module and an electrical equipment. Background Art

[0002] In the current technological field, the preparation process of sodium-ion batteries has received extensive attention and research. At present, its main preparation process is as follows: First, the two sides of an aluminum foil are coated with a positive electrode material to serve as the positive electrode plate of the battery, and the two sides of the aluminum foil are coated with a negative electrode material to serve as the negative electrode plate of the battery. After the preparation of the positive and negative electrode plates is completed, these electrode plates are assembled in an orderly manner by using a precise winding process or a stacking technique to form a complete sodium-ion battery.

[0003] However, it is worth noting that although the above process can successfully prepare sodium-ion batteries, since the electrode plates are connected to each other in parallel during the assembly process, this design characteristic results in a relatively low overall voltage performance of the battery. In the application field of the battery, the voltage directly affects its energy density and performance. Therefore, this low-voltage characteristic limits the wide application of sodium-ion batteries to a certain extent.

[0004] In view of this, it is necessary for us to conduct in-depth discussions and research on the existing technology, with a view to improving the voltage performance of sodium-ion batteries through technological innovation and improvement, so as to promote their further development in the field of energy storage.

[0005] The above information is given as background information only to assist in understanding the present disclosure, and does not determine or admit whether any of the above content can be used as the prior art relative to the present disclosure. Summary of the Utility Model

[0006] The utility model provides a battery module and an electrical equipment to solve the problems existing in the prior art.

[0007] To achieve the above object, the utility model provides the following technical solutions:

[0008] In the first aspect, the utility model provides a battery module, including a housing and a plurality of aluminum foils and a plurality of separator films stacked in the housing; wherein,

[0009] One separator film is arranged between every two adjacent aluminum foils;

[0010] Among the two aluminum foils at both ends, one of the aluminum foils is provided with a positive electrode paste on the surface facing its adjacent aluminum foil, and the other aluminum foil is provided with a negative electrode paste on the surface facing its adjacent aluminum foil; among the opposite surfaces of the remaining aluminum foils in the middle, one surface is provided with a positive electrode paste and the other surface is provided with a negative electrode paste;

[0011] The polarities of the slurries provided on the opposite surfaces of every two adjacent pieces of the aluminum foil are different.

[0012] Further, in the battery module, the four sides of the aluminum foil are respectively welded to the housing, and an independent and enclosed space is formed between every two adjacent pieces of the aluminum foil.

[0013] Further, in the battery module, the housing is an aluminum shell or an aluminum plastic film.

[0014] Further, in the battery module, a safety valve is provided on the housing corresponding to each independent and enclosed space.

[0015] Further, in the battery module, the positive electrode slurry includes a layered oxide, a polyanion, and prussian blue;

[0016] Alternatively, the positive electrode slurry includes a layered oxide, a polyanion, and prussian white.

[0017] Further, in the battery module, the negative electrode slurry includes hard carbon, soft carbon, and modified graphite.

[0018] Further, the battery module further includes an electrolyte;

[0019] The electrolyte is located inside the housing.

[0020] Further, in the battery module, the electrolyte is a carbonate solvent organic ether electrolyte.

[0021] Further, in the battery module, the separator is PP or PE or glass fiber.

[0022] In a second aspect, the present utility model provides an electrical equipment, including the battery module provided in the first aspect as described above.

[0023] Compared with the prior art, the present utility model has the following beneficial effects:

[0024] A battery module and an electrical equipment provided by the present utility model stack a plurality of pieces of aluminum foil and a plurality of pieces of separator, and design the aluminum foil at one end as a single-sided and single-polarity pole piece, the aluminum foil at the other end as a single-sided and single-polarity pole piece, while the aluminum foils in the middle are all double-sided and different-polarity pole pieces, so that a series-connected battery can be assembled, improving the voltage performance of a single battery and being beneficial to the wide application of sodium ion batteries.

[0025] The present utility model has other characteristics and advantages, which will be apparent from the accompanying drawings incorporated herein and the subsequent detailed description, or will be described in detail in the accompanying drawings incorporated herein and the subsequent detailed description. These accompanying drawings and detailed description are used together to explain the specific principles of the present utility model. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0027] Figure 1 FIG. 9 is a schematic (three-dimensional) view of the structure of a battery module provided in Embodiment 1 of the present utility model;

[0028] Figure 2 FIG. 13 is a schematic (cross-sectional) view of the structure of a battery module provided in Embodiment 1 of the present utility model.

[0029] Reference Numerals:

[0030] housing 1, aluminum foil 2, separator 3, positive electrode paste 4, negative electrode paste 5, safety valve 6 Detailed Description of the Embodiments

[0031] To describe in detail the possible application scenarios, technical principles, specific implementable solutions, achievable purposes and effects, etc. of the present application, the following will be described in detail with reference to the specific embodiments listed and the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0032] Referring to "embodiment" herein means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various positions in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0033] Unless otherwise defined, the meanings of the technical terms used herein are the same as those commonly understood by those skilled in the technical field to which the present application belongs; the use of the relevant terms herein is only for describing specific embodiments and is not intended to limit the present application.

[0034] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that there can be three relationships. For example, A and / or B means: there is A, there is B, and there is both A and B at the same time. In addition, the character " / " in this text generally represents an "or" logical relationship between the associated objects before and after.

[0035] In this application, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantitative, primary-secondary, or sequential relationships between these entities or operations.

[0036] Without more limitations, in this application, the expressions "include", "comprise", "have", or other similar expressions used in a statement are intended to cover non-exclusive inclusion. These expressions do not exclude the possibility that there may be additional elements in the process, method, or product that includes the described elements. Thus, a process, method, or product that includes a series of elements may include not only those limited elements, but also other elements that are not explicitly listed, or elements that are inherent to this process, method, or product.

[0037] Similar to the understanding in the "Examination Guidelines", in this application, expressions such as "greater than", "less than", "exceeding", etc. are understood not to include the number itself; expressions such as "above", "below", "within", etc. are understood to include the number itself. In addition, in the description of the embodiments of this application, the meaning of "a plurality of" is two or more (including two). Similar expressions related to "many", such as "multiple groups", "multiple times", etc., are understood in the same way, unless otherwise specifically limited.

[0038] In the description of the embodiments of this application, the spatially related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiment or the drawing. It is only for the convenience of describing the specific embodiments of this application or for the reader's understanding, rather than indicating or implying that the indicated device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of this application.

[0039] Unless otherwise clearly specified or limited, in the description of the embodiments of this application, terms such as "installation", "connection", "attachment", "fixation", "setting", etc. shall be understood in a broad sense. For example, the "connection" may be a fixed connection, a detachable connection, or an integral setting; it may be a mechanical connection, an electrical connection, or a communication connection; it may be a direct connection, or an indirect connection through an intermediate medium; it may be the communication inside two components or the interaction relationship between two components. For those skilled in the art to which this application pertains, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0040] Embodiment 1

[0041] In view of the defects existing in the above-mentioned prior art, based on the rich practical experience and professional knowledge accumulated by the applicant in the design and manufacture of such products for many years, and in cooperation with the application of theory, the applicant has actively carried out research and innovation in the hope of creating a technology that can solve the defects in the prior art. After continuous research, design, and repeated trial production of samples and improvements, a truly practical and valuable utility model has finally been created.

[0042] Please refer to Figure 1-2 , the embodiment of the present utility model provides a battery module, which has a delicate structure and powerful functions. This battery mainly consists of a sturdy housing 1 and a number of components carefully arranged inside. Specifically, these components include several aluminum foils 2 and several separator films 3 arranged in layers.

[0043] To ensure the stability and safety of the internal structure of the battery, a specific layout method is adopted in this design. Specifically, one separator film 3 is arranged between every two adjacent aluminum foils 2 to ensure that the positive and negative electrode materials inside the battery do not come into direct contact, thus avoiding possible safety problems;

[0044] Among the two aluminum foils 2 at both ends, one of the aluminum foils 2 is provided with a positive electrode paste 4 on the side facing its adjacent aluminum foil 2, and the other aluminum foil 2 is provided with a negative electrode paste 5 on the side facing its adjacent aluminum foil 2. Such a design makes these two aluminum foils 2 become single-sided and single-polarity electrode plates respectively; among the opposite sides of the remaining aluminum foils 2 in the middle, one side is provided with a positive electrode paste 4 and the other side is provided with a negative electrode paste 5, that is, these aluminum foils 2 are all double-sided and different-polarity electrode plates;

[0045] It should be noted that to ensure that the current inside the battery can flow along a predetermined path, this design also specifically stipulates that the polarities of the pastes provided on the opposite sides of every two adjacent aluminum foils 2 must be different.

[0046] As Figure 2As shown, assuming the voltage of a single electrode is 3V, the voltage of this battery is 12V. According to the design method provided in this embodiment, batteries with different voltages can be designed.

[0047] In summary, through the carefully designed laminated structure and positive and negative electrode layout, the present utility model has successfully realized a series-connected sodium-ion battery. This design not only improves the voltage performance of a single battery but also further broadens the application prospects of sodium-ion batteries in various fields, demonstrating its huge market potential and practical value.

[0048] Please refer to again Figure 2 , in this embodiment, the structural design of the sodium-ion battery is further optimized. Specifically, the four sides of the aluminum foil 2 are all precisely welded to the outer shell 1 of the battery. This design ensures a firm connection between the aluminum foil 2 and the shell 1 and also helps improve the overall safety of the battery.

[0049] More notably, between every two adjacent aluminum foils 2, an independent enclosed space is formed through welding or other sealing techniques. Such a design effectively isolates the positive and negative electrode materials in each space, avoiding direct contact between the positive and negative electrode materials, thereby eliminating potential short-circuit risks and further enhancing the safety of the battery.

[0050] In addition, to meet the requirements of different application scenarios, this embodiment provides a variety of optional materials for the shell 1. Specifically, the shell 1 can be an aluminum shell or an aluminum-plastic film. The aluminum shell has become an ideal choice due to its light weight, high strength, and excellent thermal conductivity, while the aluminum-plastic film shows its unique advantages in specific scenarios with its good flexibility and processability. The selection of these two materials not only ensures the stable performance of the battery but also provides greater flexibility for the battery design.

[0051] Please refer to again Figure 1 , in this embodiment, the safety performance of the sodium-ion battery is further improved. Specifically, on the shell 1 of the battery, a safety valve 6 is carefully set for each independent enclosed space formed by laminating the aluminum foil 2 and the separator film 3.

[0052] The design purpose of the safety valve 6 is to automatically open and release excess gas when the internal pressure of the battery rises abnormally, thereby preventing safety accidents such as explosion or leakage of the battery due to excessive internal pressure. This design effectively guarantees the safety of the battery during use, enabling the sodium-ion battery to operate more stably and reliably in various application scenarios.

[0053] In addition, the setting of the safety valve 6 also takes into account the service life and maintenance cost of the battery. When the internal pressure of the battery returns to normal, the safety valve 6 can automatically close, enabling the battery to continue to work normally. This not only extends the service life of the battery but also reduces the maintenance cost for users.

[0054] In this embodiment, the positive and negative electrode materials of the sodium-ion battery are further optimized to ensure that the battery has higher energy density, longer cycle life, and more stable working performance.

[0055] For the positive electrode slurry 4, layered oxides, polyanions, and Prussian blue, or, layered oxides, polyanions, and Prussian white are used as the main components. Layered oxides have good ionic conduction performance and high specific capacity, and can provide the energy density and cycle stability required by the battery. Polyanions are known for their excellent stability and safety, and can further improve the safety performance of the battery. Prussian blue and Prussian white are a type of materials with an open framework structure that allows sodium ions to quickly embed and extract inside. This structure enables these materials to have high specific capacity and good cycle stability. The main difference between Prussian blue and Prussian white lies in their degree of hydration, where Prussian white is anhydrous. These materials have broad application prospects in the field of sodium-ion batteries.

[0056] For the negative electrode slurry 5, hard carbon, soft carbon, and modified graphite are selected as the main components. Both hard carbon and soft carbon have good sodium storage capacity and cycle stability, and can effectively improve the capacity and cycle life of the battery. Modified graphite further improves its electrochemical performance through technical means such as surface modification, making the negative electrode material more suitable for the working requirements of sodium-ion batteries.

[0057] This selection of positive and negative electrode materials not only significantly improves the performance of sodium-ion batteries but also provides a broader space for their applications in fields such as large-scale energy storage and electric vehicles. We believe that with the continuous progress of technology and the continuous expansion of applications, sodium-ion batteries will play a more important role in the future.

[0058] In this embodiment, an electrolyte, a key component, is added to the sodium-ion battery to ensure that the ions inside the battery can migrate and transport smoothly, thereby enabling the normal operation of the battery. The electrolyte is located inside the battery housing 1 and together with the positive and negative electrode materials constitutes a complete battery system.

[0059] For the selection of the electrolyte, a carbonate solvent organic ether electrolyte was specifically considered. This electrolyte has a high ionic conductivity and electrochemical stability, which can effectively promote the migration of sodium ions between the positive and negative electrodes of the battery, thereby improving the charge-discharge efficiency and cycle life of the battery. In addition, the carbonate solvent organic ether electrolyte also has good thermal stability and safety, can maintain stable performance within a wide temperature range, and is not prone to safety accidents such as fires or explosions.

[0060] Both the carbonate solvent and the organic ether solvent in the carbonate solvent organic ether electrolyte have certain advantages. The carbonate solvent has a high dielectric constant and solubility, which can effectively dissolve sodium salts and promote the migration of sodium ions. The organic ether solvent, on the other hand, has good chemical stability and thermal stability, can form a stable complex with sodium salts, and improve the electrochemical performance and safety of the electrolyte.

[0061] By adopting the carbonate solvent organic ether electrolyte, the sodium-ion battery of this embodiment has been significantly improved in performance. This electrolyte can not only improve the charge-discharge efficiency and cycle life of the battery, but also improve the safety and stability of the battery, making the sodium-ion battery more suitable for use in various complex environments.

[0062] In this embodiment, regarding the separator 3 of the sodium-ion battery, a variety of optional materials are provided to meet the requirements of different application scenarios. Specifically, the separator 3 can be made of materials such as PP (polypropylene), PE (polyethylene) or glass fiber.

[0063] As common plastic materials, PP and PE have good chemical stability and mechanical strength, can effectively isolate the positive and negative electrode materials, and prevent internal short circuits in the battery. At the same time, they also have a high ion permeability, which can ensure the smooth transmission of sodium ions inside the battery. In addition, the PP and PE materials also have a low cost, which is beneficial to reducing the overall manufacturing cost of the battery.

[0064] On the other hand, as an inorganic non-metallic material, glass fiber has excellent high-temperature resistance and chemical stability. In a high-temperature environment, the glass fiber separator can maintain stable performance and will not affect the normal operation of the battery due to thermal shrinkage or thermal expansion. In addition, glass fiber also has high mechanical strength, can effectively prevent the puncture of sodium dendrites, and improve the safety performance of the battery.

[0065] Although terms such as housing, aluminum foil, separator, and positive electrode paste are used more frequently in this application, the possibility of using other terms is not excluded. The use of these terms is only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

[0066] A battery module provided by the present utility model stacks a plurality of aluminum foils and a plurality of separator films, and designs the aluminum foil at one end as a unipolar electrode with a single side, the aluminum foil at the other end as a unipolar electrode with a single side, and the aluminum foils in the middle as bipolar electrodes with different polarities on both sides, so that a series-connected battery can be assembled, improving the voltage performance of a single battery and facilitating the wide application of sodium-ion batteries.

[0067] Embodiment 2

[0068] The present utility model provides an electrical device including the battery module provided in the above Embodiment 1.

[0069] It should be noted that the electrical device can be, for example, an electronic device, an electric vehicle or a power storage system. Among them, the electronic device can be, for example, various computers, mobile phones, display screens, etc. that use a battery as a driving power source. The electric vehicle can be, for example, an electric car, an electric tricycle, an electric bicycle, etc. that use a battery as a driving power source. The power storage system can be, for example, a power storage system that uses a battery as a power storage source.

[0070] It can be understood that the electrical device should include, in addition to the battery for providing electrical energy, an object for receiving electrical energy, that is, an electrical-consuming entity. The battery is connected to the electrical-consuming entity, and the electrical-consuming entity can realize a set function under the drive of electrical energy.

[0071] An electrical device provided by the present utility model stacks a plurality of aluminum foils and a plurality of separator films, and designs the aluminum foil at one end as a unipolar electrode with a single side, the aluminum foil at the other end as a unipolar electrode with a single side, and the aluminum foils in the middle as bipolar electrodes with different polarities on both sides, so that a series-connected battery can be assembled, improving the voltage performance of a single battery and facilitating the wide application of sodium-ion batteries.

[0072] Finally, it should be noted that although the above embodiments have been described in the text of the specification and the drawings of the present application, the patent protection scope of the present application cannot be limited thereby. Any technical solution obtained by equivalent structure or equivalent process substitution or modification based on the essential concept of the present application and using the content recorded in the text of the specification and the drawings of the present application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, etc., are all included in the patent protection scope of the present application.

Claims

1. A battery module, characterized in that, It includes a housing (1), and a plurality of aluminum foils (2) and a plurality of separator films (3) which are stacked and arranged inside the housing (1); wherein, One separator film (3) is arranged between every two adjacent aluminum foils (2); Among the two aluminum foils (2) at both ends, on one side of one of the aluminum foils (2) facing its adjacent aluminum foil (2), a positive electrode paste (4) is provided, and on one side of the other aluminum foil (2) facing its adjacent aluminum foil (2), a negative electrode paste (5) is provided; among the opposite two sides of the remaining aluminum foils (2) in the middle, on one side of each, a positive electrode paste (4) is provided, and on the other side, a negative electrode paste (5) is provided; The polarities of the pastes provided on the opposite surfaces of every two adjacent aluminum foils (2) are different.

2. The battery module according to claim 1, wherein, The peripheries of the aluminum foils (2) are respectively welded to the housing (1), and an independent and enclosed space is formed between every two adjacent aluminum foils (2).

3. The battery module according to claim 2, wherein The housing (1) is an aluminum shell or an aluminum plastic film.

4. The battery module according to claim 2, characterized in that A safety valve (6) is provided on the housing (1) corresponding to each independent and enclosed space.

5. The battery module according to claim 1, characterized in that, The positive electrode paste (4) includes a layered oxide, a polyanion, and prussian blue; Or, the positive electrode paste (4) includes a layered oxide, a polyanion, and prussian white.

6. The battery module according to claim 1, characterized in that, The negative electrode paste (5) includes hard carbon, soft carbon, and modified graphite.

7. The battery module according to claim 1, wherein It further includes an electrolyte; The electrolyte is located inside the housing (1).

8. The battery module according to claim 7, characterized in that, The electrolyte is a carbonate solvent organic ether electrolyte.

9. The battery module according to claim 1, wherein The separator film (3) is PP or PE or glass fiber.

10. An electrical device, characterized in that, It includes a battery module according to any one of claims 1-9.

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