Bipolar battery

Abstract

The utility model discloses a bipolarity battery, including positive single pole board, a plurality of bipolarity board and negative single pole board, the bipolarity board is by positive active material layer, conducting base plate and negative active material layer constitutes, be equipped with first sealant layer between two adjacent conducting base plates, first sealant layer is rectangular frame structure, first sealant layer is located at the four peripheral edges of conducting base plate, and first sealant layer outer frame edge and conducting base plate outer edge leave a certain interval between, two adjacent conducting base plates and first sealant layer outer frame edge form sealed recess, the sealed recess is filled with second sealant layer, the outer edge of conducting base plate, second sealant layer is equipped with third sealant layer, to seal the positive single pole board, bipolarity board and negative single pole board and form the whole, through three layer sealing structure design, effectively prevent electrolyte leakage, strengthen battery structure stability, significantly improve battery performance and service life, ensure that the battery is stable operation under complex working condition.

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 constructed from multiple stacked sealed frames. Within each frame, a separator and bipolar electrodes are alternately stacked, with active materials of different polarities coated on both sides of the bipolar electrodes. It can be simply understood as a battery composed of multiple battery cells connected in series, each cell consisting of a sealed frame, bipolar electrodes, and a separator. This type of battery is characterized by high voltage, high energy density, and high overcurrent capability. The structural design of a bipolar battery has a crucial impact on its performance, safety, and stability.

[0003] Existing bipolar batteries have some shortcomings in the sealing structure design between the plates, which may lead to problems such as electrolyte leakage during use, affecting battery performance and lifespan. For example, an improperly designed sealant layer between the plates may not effectively prevent electrolyte seepage, potentially causing internal short circuits and other malfunctions, thus reducing battery reliability.

[0004] Therefore, it is necessary to improve the structure of bipolar batteries to enhance their overall performance and stability. Utility Model Content

[0005] To address the above problems, this utility model provides a bipolar battery that improves the battery's sealing performance and prevents electrolyte leakage by optimizing the sealing structure between the plates, thereby enhancing the battery's performance and lifespan.

[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 plurality of bipolar plates and a negative monopolar plate, wherein the bipolar plate is composed of a positive active material layer, a conductive substrate and a negative active material layer.

[0008] A first sealant layer is provided between two adjacent conductive substrates. The first sealant layer has a rectangular frame structure. The first sealant layer is located at the four edges of the conductive substrate, and there is a certain gap between the outer edge of the first sealant layer and the outer edge of the conductive substrate.

[0009] Two adjacent conductive substrates form a sealing groove with the outer edge of the first sealant layer, and the sealing groove is filled with a second sealant layer.

[0010] The conductive substrate and the outer edge of the second sealant layer are provided with a third sealant layer to seal the positive unipolar plate, bipolar plate and negative unipolar plate into a whole.

[0011] The above technical solution offers the following advantages: Compared to existing technologies, this technology significantly improves the sealing performance and structural stability of bipolar batteries through a unique sealing structure design. A first sealant layer with a rectangular frame structure is set between adjacent conductive substrates with a reserved gap, forming a sealing groove that fills the second sealant layer. Combined with a third sealant layer on the outer edge, this constitutes a three-layer sealing system, effectively preventing electrolyte leakage. Simultaneously, this sealing design, in conjunction with the electrode structure, enhances the overall stability of the battery, ensuring reliable performance and extended lifespan in various usage scenarios.

[0012] As a further improvement to the above technical solution, a clamping plate is provided on the side of the positive monopolar plate and the negative monopolar plate away from the bipolar plate;

[0013] The clamping plate is provided with fastening screws at its four corners, and the fastening screws pass through the clamping plate and are threadedly connected to the matching nuts;

[0014] The area of ​​the clamping plate is larger than the area of ​​the positive monopolar plate and the negative monopolar plate;

[0015] The clamping plate, positive monopolar plate, bipolar plate, and negative monopolar plate are clamped and fixed by the cooperation of four sets of fastening screws and nuts.

[0016] The above technical solution offers the following benefits: By setting larger clamping plates on the side of the positive and negative monopolar plates away from the bipolar plates, and using a connection structure with fastening screws and nuts, the clamping plates can act as precise boundary barriers and support frames during the pouring of the second and third sealant layers. This effectively limits the flow range of the sealant, preventing sealant overflow, accumulation, or uneven filling, ensuring that the sealant is uniformly and quantitatively filled to the corresponding positions. Simultaneously, during the clamping and fixing of each component with the fastening screws and nuts, uniform pressure is applied to the sealant layers, prompting the sealant to fully fill the tiny gaps between the plates, significantly enhancing the adhesion between the sealant and the plates, and between each sealant layer. This substantially improves the overall sealing performance and assembly quality of the battery.

[0017] As a further improvement to the above technical solution, the bipolar battery also includes a separator disposed between the positive and negative electrodes.

[0018] As a further improvement to the above technical solution, the distance between the outer edge of the first sealant layer and the outer edge of the conductive substrate is 1 to 10 mm, and the distance between the inner edge of the first sealant layer and the outer edge of the negative electrode active material layer is 1 to 5 mm.

[0019] As a further improvement to the above technical solution, the depth of the sealing groove is 1 to 10 mm.

[0020] As a further improvement to the above technical solution, a roughening layer is provided around the perimeter of the conductive substrate.

[0021] The above technical solution has the following advantages: By setting a roughening layer around the edges of the conductive substrate, the surface roughness is increased, which significantly increases the contact area and friction between the sealant layer and the conductive substrate, effectively improving the adhesion between the two. During battery assembly and use, even if subjected to vibration, external impact, or temperature changes, the sealant layer is not easily detached or displaced from the conductive substrate, thereby ensuring that the three sealant layers are tightly bonded to the conductive substrate, further strengthening the overall sealing structure of the battery, effectively preventing electrolyte leakage, and ensuring the sealing performance and reliability of the bipolar battery under complex operating conditions. Attached Figure Description

[0022] 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.

[0023] Figure 1 A cross-sectional view of the bipolar battery assembly provided by this utility model;

[0024] Figure 2 A schematic diagram of the bipolar plate structure provided by this utility model;

[0025] Figure 3 A three-dimensional schematic diagram of the assembly of the bipolar battery, clamping plate, and fastening screw provided by this utility model;

[0026] Figure 4 A cross-sectional view of the bipolar battery, clamping plate, and fastening screw assembly provided by this utility model;

[0027] Figure 5 A schematic diagram of the bipolar battery and the third sealing layer provided by this utility model;

[0028] Figure 6 A schematic diagram of the assembly of the first sealant layer and the conductive substrate provided by this utility model;

[0029] Explanation of reference numerals in the attached figures;

[0030] 11-Positive monopolar plate; 12-Bipolar plate; 121-Negative active material layer; 122-Conductive substrate; 123-Positive active material layer; 13-Negative monopolar plate; 2-First sealant layer; 3-Sealing groove; 31-Second sealant layer; 32-Third sealant layer; 4-Clamping plate; 41-Fastening screw; 5-Diaphragm. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Example 1

[0037] like Figures 1 to 6 As shown, a bipolar battery includes a positive monopolar plate 11, a plurality of bipolar plates 12 and a negative monopolar plate 13. The bipolar plate 12 is composed of a positive active material layer 123, a conductive substrate 122 and a negative active material layer 121. The areas of the positive active material layer 123 and the negative active material layer 121 are smaller than the area of ​​the conductive substrate 122.

[0038] A first sealant layer 2 is provided between two adjacent conductive substrates 122. The first sealant layer 2 has a rectangular frame structure. The first sealant layer 2 is located at the periphery of the conductive substrate 122, and a certain gap is left between the outer edge of the first sealant layer 2 and the outer edge of the conductive substrate 122.

[0039] Two adjacent conductive substrates 122 form a sealing groove 3 with the outer edge of the first sealant layer 2, and the sealing groove 3 is filled with a second sealant layer 31.

[0040] A third sealant layer 32 is provided at the outer edge of the conductive substrate 122 and the second sealant layer 31 to seal the positive unipolar plate 11, the bipolar plate 12 and the negative unipolar plate 13 into a whole.

[0041] By setting a first sealant layer 2 with a rectangular frame structure between adjacent conductive substrates 122 and leaving a gap, a sealing groove 3 is formed by the outer edge of the frame of the first sealant layer 2 and the adjacent conductive substrates 122. With the second sealant layer 31 filled in the groove 3 and the third sealant layer 32 on the outer edge, the three-layer sealing structure effectively prevents electrolyte leakage along the gap between the plates. At the same time, the structural cooperation between the conductive substrates 122 and the sealant layer enhances the stability of battery stacking and avoids internal short circuits due to sealing failure, thereby improving the performance reliability and service life of the battery in charge and discharge cycles.

[0042] In this embodiment, a clamping plate 4 is provided on the side of the positive monopolar plate 11 and the negative monopolar plate 13 away from the bipolar plate 12;

[0043] The clamping plate 4 is provided with fastening screws 41 at each of its four corners. The fastening screws 41 pass through the clamping plate 4 and are threadedly connected to the matching nuts.

[0044] The area of ​​clamping plate 4 is larger than the areas of positive monopolar plate 11 and negative monopolar plate 13;

[0045] The clamping plate 4, positive unipolar plate 11, bipolar plate 12 and negative unipolar plate 13 are clamped and fixed by the cooperation of four sets of fastening screws 41 and nuts.

[0046] By setting a larger clamping plate 4 on the side of the positive monopole plate 11 and the negative monopole plate 13 away from the bipolar plate 12, and cooperating with the connection structure of the fastening screw 41 and nut, the clamping plate 4 can act as a precise boundary barrier and support frame when pouring the second sealant layer 31 and the third sealant layer 32. This effectively limits the flow range of the sealant, avoids sealant overflow, accumulation or uneven filling, and ensures that the sealant can be filled evenly and quantitatively to the corresponding positions. At the same time, during the process of clamping and fixing each component by the fastening screw 41 and nut, uniform pressure can be applied to the sealant layer, causing the sealant to fully fill the tiny gaps between the plates, significantly enhancing the adhesion between the sealant and the plates and between each sealant layer, thereby greatly improving the overall sealing performance and assembly quality of the battery.

[0047] In this embodiment, the bipolar battery also includes a separator 5 disposed between the positive and negative electrodes.

[0048] In this embodiment, the distance between the outer edge of the first sealant layer 2 and the outer edge of the conductive substrate 122 is 1 to 10 mm, and the distance between the inner edge of the first sealant layer 2 and the outer edge of the negative electrode active material layer 121 is 1 to 5 mm.

[0049] The depth of the sealing groove 3 is 1 to 10 mm.

[0050] In this embodiment, a roughening layer is provided around the periphery of the conductive substrate 122;

[0051] By setting a roughened layer around the edges of the conductive substrate 122, the surface roughness is increased, which significantly increases the contact area and friction between the sealant layer and the conductive substrate 122, effectively improving the adhesion between the two. During battery assembly and use, even if subjected to vibration, external impact, or temperature changes, the sealant layer is not easily detached or displaced from the conductive substrate 122, thereby ensuring that the three sealant layers are tightly bonded to the conductive substrate 122, further strengthening the overall sealing structure of the battery, effectively preventing electrolyte leakage, and ensuring the sealing performance and reliability of the bipolar battery under complex operating conditions.

[0052] In this embodiment, the second sealant 31 and the third sealant 32 are made of epoxy resin, silicone sealant or polyurethane sealant.

[0053] In this embodiment, a separator is provided between the positive monopolar plate 11, the bipolar plate 12, and the negative monopolar plate 13; by providing a separator between each plate, it is ensured that the positive and negative active materials are prevented from directly contacting each other, preventing short circuits inside the battery and ensuring ion conduction.

[0054] In this embodiment, the first sealant 2 is made of corrosion-resistant materials, such as fluororubber or silicone rubber.

[0055] Working principle of this utility model:

[0056] S1. Prepare a positive monopolar plate 11, a number of bipolar plates 12 and a negative monopolar plate 13 respectively. The bipolar plate 12 needs to complete the composite fabrication of the positive active material layer 123, the conductive substrate 122 and the negative active material layer 121.

[0057] S2. The first sealant layer 2 is placed at the periphery of the conductive substrate 122, and a gap is reserved between the outer edge of the first sealant layer 2 and the outer edge of the conductive substrate 122; the gap between the outer edge of the first sealant layer 2 and the outer edge of the conductive substrate 122 is 1-10mm, and the gap between the inner edge of the first sealant layer 2 and the outer edge of the negative electrode active material layer 121 is 1-5mm.

[0058] S3. The positive monopolar plate 11, the bipolar plate 12 and the negative monopolar plate 13 are stacked in sequence, so that the first sealant layer 2 between two adjacent conductive substrates 122 are bonded to each other, and the two adjacent conductive substrates 122 and the outer edge of the first sealant layer 2 form a sealing groove 3.

[0059] S4. Place clamping plates 4 on the side of the positive monopolar plate 11 and the negative monopolar plate 13 away from the bipolar plate 12, so that the four corners of the clamping plates 4 are aligned with the corresponding positions. Pass the fastening screws 41 through the clamping plates 4 in sequence and connect them with the matching nuts. By tightening the nuts, the clamping plates 4, the positive monopolar plate 11, the bipolar plate 12 and the negative monopolar plate 13 are clamped and fixed by the cooperation of the four sets of fastening screws 41 and nuts.

[0060] S5. Place the clamped bipolar battery into the filling groove, and fill the sealing groove 3 with the second sealing adhesive layer 31 until it covers the sealing groove 3 at the top of the bipolar battery.

[0061] S6. The outer edge of the second sealing layer 31 is coated with the third sealing layer 32 to seal the positive unipolar plate 11, the bipolar plate 12 and the negative unipolar plate 13 into a whole. Finally, the surface of the battery is trimmed to complete the fabrication of the bipolar battery.

[0062] 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.

[0063] 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 (11), a plurality of bipolar plates (12) and a negative monopolar plate (13), wherein the bipolar plate (12) is composed of a positive active material layer (123), a conductive substrate (122) and a negative active material layer (121), characterized in that: A first sealant layer (2) is provided between two adjacent conductive substrates (122). The first sealant layer (2) has a rectangular frame structure. The first sealant layer (2) is located at the periphery of the conductive substrate (122), and there is a certain gap between the outer edge of the first sealant layer (2) and the outer edge of the conductive substrate (122). Two adjacent conductive substrates (122) form a sealing groove (3) with the outer edge of the first sealant layer (2), and the sealing groove (3) is filled with a second sealant layer (31); The conductive substrate (122) and the outer edge of the second sealant layer (31) are provided with a third sealant layer (32) to seal the positive unipolar plate (11), the bipolar plate (12) and the negative unipolar plate (13) into a whole.

2. The bipolar battery according to claim 1, characterized in that, Both the positive monopolar plate (11) and the negative monopolar plate (13) are provided with clamping plates (4) on the side away from the bipolar plate (12); The clamping plate (4) is provided with fastening screws (41) at its four corners. The fastening screws (41) pass through the clamping plate (4) and are threadedly connected to the matching nuts. The area of ​​the clamping plate (4) is larger than the area of ​​the positive monopolar plate (11) and the negative monopolar plate (13); The clamping plate (4), positive monopolar plate (11), bipolar plate (12) and negative monopolar plate (13) are clamped and fixed by the cooperation of four sets of fastening screws (41) and nuts.

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

4. A bipolar battery according to claim 1, characterized in that, The distance between the outer edge of the first sealant layer (2) and the outer edge of the conductive substrate (122) is 1 to 10 mm, and the distance between the inner edge of the first sealant layer (2) and the outer edge of the negative electrode active material layer (121) is 1 to 5 mm.

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

6. A bipolar battery according to claim 1, characterized in that, The conductive substrate (122) has a roughened layer around its perimeter.

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