A bipolar battery

Abstract

The utility model discloses a bipolarity battery relates to bipolarity battery technical field, including positive single pole board, bipolarity board, negative single pole board and sealed frame, the sealed frame is rectangular frame structure, the four peripheral edges of sealed frame are equipped with sealed convex, sealed convex is located the middle axle at sealed frame thickness direction, the thickness of sealed convex is less than the thickness of sealed frame, and the sealed recess is formed between the sealed convex of adjacent sealed frame, and the sealed recess is located the gap between adjacent sealed frame, the sealed recess is filled with sealant. Compared with prior art bipolarity battery, the bipolarity battery has the advantages that the sealing performance of the sealed frame is effectively improved, and the risk of liquid leakage is reduced through the mode that the sealed convex and the sealed recess cooperate to fill the sealing material. The unique rectangular frame structure and the sealed convex position design optimize the overall structure, making the battery structure more compact and stable. Moreover, the structure of the sealed recess formed by stacking in sequence simplifies the assembly process, reduces the assembly difficulty and cost, improves the production efficiency and the reliability of the battery.

Description

Technical Field

[0001] This utility model relates to the field of bipolar battery technology, specifically to a bipolar battery. Background Technology

[0002] A bipolar battery is composed of multiple stacked sealed frames, within which separators and bipolar electrodes are alternately stacked. Each bipolar electrode is coated with an active material of different polarities on both sides. It can be simply understood as a battery composed of multiple battery cells connected in series, each battery cell consisting of a sealed frame, bipolar electrodes, and a separator. This type of battery features high voltage, high energy density, and high overcurrent capability.

[0003] However, a thorough analysis of existing bipolar battery sealing frames reveals numerous shortcomings in terms of sealing performance. For example, the machining process inevitably leaves various microscopic defects and shape and size deviations on the surface of the sealing frame, causing gaps to form at the joints. Once a pressure difference exists on both sides of the seal, the working medium can easily leak through these gaps. Furthermore, traditional sealing methods mostly rely on a single sealing strip or sealing structure, making it difficult to adapt to the sealing requirements under complex operating conditions. For instance, in high-temperature and high-humidity environments, the sealing strip is prone to aging and deformation, resulting in a significant decrease in sealing performance.

[0004] In summary, existing bipolar batteries have shortcomings in several aspects, such as the sealing performance of the sealing frame, structural design, and assembly process. There is an urgent need for innovative technologies and solutions to overcome these bottlenecks in order to meet the growing demand for bipolar batteries in the field of high-performance energy storage. Utility Model Content

[0005] To address the above problems, this utility model provides a bipolar battery to solve the technical problems mentioned in the background art, such as "the existing bipolar batteries have deficiencies in many aspects, such as the sealing performance of the sealing frame, structural design, and assembly process".

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A bipolar battery includes a positive monopolar plate, a bipolar plate, a negative monopolar plate, and a sealing frame;

[0008] The sealing frame has a rectangular frame structure;

[0009] The sealing frame has sealing protrusions around its four edges, and the sealing protrusions are located at the central axis of the sealing frame in the thickness direction; the thickness of the sealing protrusions is less than the thickness of the sealing frame.

[0010] A sealing groove is formed between the sealing protrusions of adjacent sealing frames, and the sealing groove is located in the gap between adjacent sealing frames; the sealing groove is filled with sealant.

[0011] The improved technical effects are as follows: This bipolar battery consists of a positive monopolar plate, a bipolar plate, a negative monopolar plate, and a rectangular frame sealing frame. The sealing frame surrounds the edge of the plate, sealing it into a single structure. A sealing protrusion is located at the central axis along the thickness direction of the sealing frame. After the sealing frames of the positive monopolar plate, bipolar plate, and negative monopolar plate are stacked sequentially, a sealing groove is formed between the sealing protrusions of adjacent sealing frames, located at the gap. The sealing groove is filled with sealing material. Compared to the shortcomings of existing bipolar batteries in terms of sealing performance, structural design, and assembly process, this design effectively improves the sealing performance of the sealing frame and reduces the risk of leakage by using sealing protrusions and sealing grooves in conjunction with the filling of sealing material. The unique rectangular frame structure and the design of the sealing protrusion positions optimize the overall structure, making the battery structure more compact and stable. Furthermore, this structure of sequentially stacking to form sealing grooves simplifies the assembly process, reduces assembly difficulty and cost, and improves production efficiency and battery reliability.

[0012] As a further improvement to the above technical solution, a protrusion is provided on one side of the sealing frame, and the protrusion is arranged around the edge of the sealing frame;

[0013] A groove is provided on the other side of the sealing frame. The groove and the protrusion are arranged opposite to each other in the thickness direction of the sealing frame. The protrusion and the groove of the adjacent sealing frame cooperate with each other to form the first sealing structure of the sealing frame.

[0014] The improved technical effects are as follows: one side of the sealing frame has a protrusion around the edge, and the other side has a groove. The protrusion and the groove of the adjacent sealing frame cooperate with each other, which further strengthens the sealing structure between the sealing frames. This overcomes the shortcomings of existing bipolar batteries in terms of sealing performance, structural design and assembly process, and improves the reliability and production efficiency of the battery.

[0015] As a further improvement to the above technical solution, the depth of the sealing groove is 0.1 to 10 mm.

[0016] The above-mentioned improved technical effect is that a sealing groove with a depth of 0.1-10mm is formed between the sealing protrusions of adjacent sealing frames. The groove is filled with sealing material. This depth range can ensure that the sealing material is filled in sufficient quantity to achieve a good sealing effect and reduce the risk of leakage, while not affecting the structural strength of the sealing frame due to excessive groove depth.

[0017] As a further improvement to the above technical solution, the cross-sectional shape of the sealing protrusion includes, but is not limited to, rectangle and trapezoid.

[0018] The above-mentioned improvements have the following effects: the cross-sectional shape of the sealing protrusion or sealing groove is rectangular or trapezoidal. The rectangular cross-section is easy to process and manufacture, and can make the sealing material fill evenly to ensure the sealing effect; the trapezoidal cross-section helps to enhance the stability of the sealing structure, prevent the sealing material from shifting during battery operation, further ensure sealing performance and reduce the risk of leakage.

[0019] As a further improvement to the above technical solution, the cross-sectional shape of the protrusion includes, but is not limited to, a semi-circle or a rectangle.

[0020] The aforementioned improvements have the following effects: the semi-circular cross-section can effectively disperse pressure, reduce stress concentration, make the connection between the sealing frames tighter, and improve the sealing effect; the rectangular cross-section facilitates processing and assembly, ensuring the stability of the sealing structure.

[0021] As a further improvement to the above technical solution, the bipolar battery also includes a separator, which is disposed between the positive and negative electrodes.

[0022] The above-mentioned improvements have the following effects: by installing a separator between each electrode plate, direct contact between the positive and negative electrode active materials is prevented, internal short circuits in the battery are prevented, and ion conduction is guaranteed.

[0023] As a further improvement to the above technical solution, the sealing material is a sealant, which is one of epoxy resin, silicone sealant or polyurethane sealant, used to form the second sealing structure of the sealing frame.

[0024] The improved technical effects are as follows: epoxy resin sealant has high strength, good chemical corrosion resistance and electrical insulation, which can ensure the reliability and stability of the seal; silicone sealant has excellent high and low temperature resistance and can maintain a good sealing state in different environments; polyurethane sealant has excellent flexibility and adhesion, which can effectively adapt to the small deformation of the battery during use. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 A cross-sectional view of the bipolar battery assembly provided by this utility model;

[0027] Figure 2 A cross-sectional view of the sealing frame and bipolar plate assembly provided by this utility model;

[0028] Figure 3 A cross-sectional view of the sealing frame provided by this utility model;

[0029] Figure 4 A three-dimensional cross-sectional view of the sealing frame and bipolar plate assembly provided by this utility model;

[0030] Figure 5 A three-dimensional schematic diagram of the sealing frame provided by this utility model;

[0031] Figure 6 A three-dimensional schematic diagram of a bipolar battery provided by this utility model;

[0032] Explanation of reference numerals in the attached figures;

[0033] 1-Positive monopolar plate; 2-Bipolar plate; 3-Negative monopolar plate; 4-Sealing frame; 41-Sealing protrusion; 42-Sealing groove; 43-Protrusion; 44-Groove; 5-Diaphragm. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0035] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] Example 1

[0040] like Figures 1 to 2 As shown, a bipolar battery includes a positive monopolar plate 1, a bipolar plate 2, a negative monopolar plate 3, and a sealing frame 4.

[0041] Sealing frame 4 is a rectangular frame structure;

[0042] The sealing frame 4 has sealing protrusions 41 around its four edges, and the sealing protrusions 41 are located at the central axis in the thickness direction of the sealing frame 4; the thickness of the sealing protrusions 41 is less than the thickness of the sealing frame 4.

[0043] A sealing groove 42 is formed between the sealing protrusions 41 of adjacent sealing frames 4. The sealing groove 42 is located in the gap between adjacent sealing frames 4. The sealing groove 42 is filled with sealant. The sealant is made of a material that is resistant to electrolyte corrosion and high temperature.

[0044] This bipolar battery consists of a positive monopolar plate 1, a bipolar plate 2, a negative monopolar plate 3, and a rectangular frame-structured sealing frame 4. The sealing frame 4 surrounds the edge of the plates, sealing them into a single structure. A sealing protrusion 41 is located at the top of the sealing frame 4 along its thickness axis. After the sealing frames 4 of the positive monopolar plate 1, bipolar plate 2, and negative monopolar plate 3 are stacked sequentially, sealing grooves 42 are formed between the sealing protrusions 41 of adjacent sealing frames 4, filling the gaps. These grooves are filled with sealing material. Compared to existing bipolar batteries with shortcomings in sealing performance, structural design, and assembly processes, this design effectively improves the sealing performance of the sealing frame 4 and reduces the risk of leakage through the combination of sealing protrusions 41 and sealing grooves 42 filled with sealing material. The unique rectangular frame structure and the positional design of the sealing protrusions 41 optimize the overall structure, making the battery structure more compact and stable. Furthermore, this structure, where sealing grooves 42 are formed by sequential stacking, simplifies the assembly process, reduces assembly difficulty and cost, and improves production efficiency and battery reliability.

[0045] The bipolar battery has clamping plates on both sides. Four sets of fastening screws and nuts clamp and secure the clamping plates, positive monopolar plate, bipolar plate, and negative monopolar plate, which helps improve the battery's sealing performance. This part is conventional technology in the field and will not be described in detail.

[0046] Example 2

[0047] like Figures 3 to 6 As shown, as a further improvement to the above embodiment 1,

[0048] One side of the sealing frame 4 is provided with a protrusion 43, and the protrusion 43 is arranged around the edge of the sealing frame 4;

[0049] A groove 44 is provided on the other side of the sealing frame 4. The groove (44) and the protrusion 43 are arranged opposite to each other in the thickness direction of the sealing frame 4. The protrusion 43 and the groove 44 of the adjacent sealing frame 4 cooperate with each other to form the first sealing structure of the sealing frame 4. This further strengthens the sealing structure between the sealing frames 4 and overcomes the shortcomings of the existing bipolar batteries in terms of sealing performance, structural design and assembly process of the sealing frame 4 from multiple aspects, thereby improving the reliability and production efficiency of the battery.

[0050] Specifically, the number of bipolar plates 2 is set to a certain extent, and the positive monopolar plate 1, bipolar plate 2, and negative monopolar plate 3 are stacked in sequence.

[0051] Specifically, the depth of the sealing groove 42 is 0.1-10mm.

[0052] Specifically, the cross-sectional shape of the sealing protrusion 41 includes, but is not limited to, rectangle and trapezoid; the rectangular cross-section is easy to process and manufacture, and can make the sealing material fill evenly to ensure the sealing effect; the trapezoidal cross-section helps to enhance the stability of the sealing structure, prevent the sealing material from shifting during battery operation, further ensure sealing performance and reduce the risk of leakage.

[0053] Specifically, the cross-sectional shape of the protrusion 43 includes, but is not limited to, semi-circular and rectangular. The semi-circular cross-section can effectively disperse pressure, reduce stress concentration, make the connection between the sealing frames 4 tighter, and improve the sealing effect. The rectangular cross-section is convenient for processing and assembly, ensuring the stability of the sealing structure.

[0054] Specifically, a separator 5 is provided between the positive monopolar plate 1, the bipolar plate 2, and the negative monopolar plate 3; by providing a separator 5 between each plate, direct contact between the positive and negative active materials is prevented, internal short circuits of the battery are prevented, and ion conduction is guaranteed.

[0055] Specifically, the sealing material is a sealant, which is one of epoxy resin, silicone sealant or polyurethane sealant; used to form the second sealing structure of the sealing frame 4.

[0056] Example 3

[0057] like Figure 1 or Figure 2 As shown, the sealing frame 4 of the positive monopolar plate 1 is provided with only protrusions 43, and the sealing frame 4 of the negative monopolar plate 3 is provided with only grooves 44. The protrusions 43 and grooves 44 cooperate with each other to form a sealing structure.

[0058] Specifically, a number of bipolar plates 2 are provided between the positive monopolar plate 1 and the negative monopolar plate 3. The sealing frame 4 of the positive monopolar plate 1, the bipolar plate 2, and the negative monopolar plate 3 forms a bipolar battery with a sealed structure through the cooperation of the protrusion 43 and the groove 44.

[0059] Specifically, the sealing frame 4 is made of corrosion-resistant material, which is a conventional technology in the field and will not be described in detail here. The principle of the bipolar battery's sealing performance is mainly based on the following aspects:

[0060] The overall sealing structure of the sealing frame: The sealing frame is set around the edges of the positive unipolar plate, bipolar plate and negative unipolar plate to form an overall sealing structure, which wraps the various plates of the battery and prevents external air, moisture and other substances from entering the battery, thus playing a preliminary sealing and protection role.

[0061] The mating of sealing protrusions and sealing grooves: Sealing protrusions are located at the top and bottom of the sealing frame. When adjacent sealing frames are stacked, sealing grooves are formed between them, situated in the gaps between the adjacent sealing frames. Sealing material is filled into the sealing grooves. When the sealing frames are stacked, the sealing protrusions and sealing grooves engage, and the sealing material fills the gaps, further preventing gas and liquid leakage and enhancing the sealing effect.

[0062] Sealing fit of protrusions and grooves: The protrusions on one side of the sealing frame and the grooves on the other side are set opposite each other in the thickness direction. The protrusions and grooves of adjacent sealing frames cooperate with each other to form another sealing barrier, preventing external media from entering the battery from the side gaps of the sealing frame and improving the overall sealing performance of the battery.

[0063] The diaphragm provides auxiliary sealing: The diaphragm placed between the positive unipolar plate, bipolar plate and negative unipolar plate can not only prevent the positive and negative plates from directly contacting each other and causing a short circuit, but also play an auxiliary sealing role to a certain extent, prevent electrolyte leakage and help maintain the sealed environment inside the battery.

[0064] Characteristics of sealing materials: The sealing materials used, such as epoxy resin, silicone sealant, or polyurethane sealant, have good adhesion, flexibility, and corrosion resistance. They can fill the gaps in the sealing groove to form a tight sealing layer, effectively preventing the intrusion of external substances. At the same time, they can adapt to the slight deformation and vibration of the battery during use, ensuring the reliability of the seal.

[0065] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0066] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The above examples are only for the purpose of helping to understand the method and core ideas of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this utility model, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without modification, should all be considered within the protection scope of this utility model.

Claims

1. A bipolar battery, comprising a positive monopolar plate (1), a bipolar plate (2), a negative monopolar plate (3), and a sealing frame (4); characterized in that: The sealing frame (4) is a rectangular frame structure; The sealing frame (4) has sealing protrusions (41) around its perimeter. The sealing protrusions (41) are located at the central axis of the sealing frame (4) in the thickness direction. The thickness of the sealing protrusions (41) is less than the thickness of the sealing frame (4). A sealing groove (42) is formed between the sealing protrusions (41) of adjacent sealing frames (4), and the sealing groove (42) is located in the gap between adjacent sealing frames (4); the sealing groove (42) is filled with sealant.

2. A bipolar battery according to claim 1, characterized in that: One side of the sealing frame (4) is provided with a protrusion (43), and the protrusion (43) is arranged around the edge of the sealing frame (4); A groove (44) is provided on the other side of the sealing frame (4). The groove (44) and the protrusion (43) are arranged opposite to each other in the thickness direction of the sealing frame (4). The protrusion (43) cooperates with the groove (44) of the adjacent sealing frame (4) to form the first sealing structure of the sealing frame (4).

3. A bipolar battery according to claim 1, characterized in that: The depth of the sealing groove (42) is 0.1~10mm.

4. A bipolar battery according to claim 1, characterized in that: The cross-sectional shape of the sealing protrusion (41) is rectangular or trapezoidal.

5. A bipolar battery according to claim 1, characterized in that: The cross-sectional shape of the protrusion (43) is semi-circular or rectangular.

6. A bipolar battery according to claim 1, characterized in that: The bipolar battery also includes a separator (5), which is disposed between the positive and negative electrodes.

7. The bipolar battery according to claim 1, characterized in that: The sealant is one of epoxy resin, silicone sealant or polyurethane sealant, used to form the second sealing structure of the sealing frame (4).

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