Bipolar current collector assembly, bipolar battery and electric equipment

Abstract

The invention provides a bipolar current collector assembly, a bipolar battery and electric equipment, the bipolar current collector assembly comprises a first bipolar current collector and a second bipolar current collector, the first bipolar current collector comprises a first surface, the first surface is provided with a first electrode and a first sealing area, and the first sealing area is located at the periphery of the first electrode; the second bipolar current collector comprises a second surface, a second electrode and a second sealing area are arranged on the second surface, and the second sealing area is located on the periphery of the second electrode; an ion transmission dielectric layer is arranged between the first electrode and the second electrode; the first sealing area is provided with a first bulge and / or a first groove; the second sealing area is provided with a second groove and / or a second protrusion. The first protrusion is inserted into the second groove, and / or the second protrusion is inserted into the first groove so that the first sealing area and the second sealing area can be connected in a sealed mode. According to the invention, the outward permeation distance of the ion transmission medium is increased, the leakage probability of the ion transmission medium is reduced, and the service life of the bipolar battery is prolonged.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a bipolar current collector assembly, a bipolar battery, and an electrical device. Background Art

[0002] A bipolar battery is a type of battery that can carry both positive and negative charges. It has a bipolar current collector inside. This current collector has a positive electrode material on one side and a negative electrode material on the other, allowing it to function as both a positive and negative electrode.

[0003] Bipolar batteries typically feature multiple bipolar current collectors. For ease of description, one of two adjacent bipolar current collectors is referred to as the first bipolar current collector, and the other as the second bipolar current collector. An electrolyte layer is provided between the electrodes of the first and second bipolar current collectors, and sealing structures such as sealing rings are used around the first and second bipolar current collectors to achieve sealing.

[0004] However, when using the solution of the related art, the sealing structure of the bipolar battery is prone to failure after being used for a period of time, thereby causing electrolyte leakage. Summary of the Invention

[0005] In order to overcome the above-mentioned defects in the related art, the purpose of the present application is to provide a bipolar current collector assembly, a bipolar battery and an electrical device, which are beneficial to reducing the probability of leakage of the ion transport medium.

[0006] In one aspect, the present application provides a bipolar current collector assembly, comprising a first bipolar current collector and a second bipolar current collector disposed opposite each other. Along a first direction, the first bipolar current collector comprises a first surface facing the second bipolar current collector, a first electrode being provided on the first surface, and the second bipolar current collector comprises a second surface facing the first bipolar current collector, a second electrode being provided on the second surface and being compatible with the first electrode, an ion transport medium layer being provided between the first electrode and the second electrode.

[0007] A first sealing area is further provided on the first surface, and along the second direction, the first sealing area is located at the periphery of the first electrode; a second sealing area is further provided on the second surface, and along the second direction, the second sealing area is located at the periphery of the second electrode;

[0008] The first sealing area is provided with a first protrusion and / or a first groove; the second sealing area is provided with a second groove and / or a second protrusion; the first protrusion corresponds to the second groove, and the first groove corresponds to the second protrusion; the first protrusion is inserted into the second groove, and / or the second protrusion is inserted into the first groove to seal the first sealing area with the second sealing area.

[0009] In a possible implementation, the first sealing area is provided with a plurality of first protrusions and / or a plurality of first grooves; the second sealing area is provided with a plurality of second grooves and / or a plurality of second protrusions; the plurality of first protrusions corresponds one-to-one to the plurality of second grooves, and the plurality of first grooves corresponds one-to-one to the plurality of second protrusions;

[0010] The first protrusion is inserted into the corresponding second groove, and / or the second protrusion is inserted into the corresponding first groove and then sealed and connected via a sealing medium.

[0011] In a possible implementation, the sealing medium includes a polyethylene adhesive layer, a polyurethane adhesive layer, or an epoxy resin adhesive layer.

[0012] In a possible implementation, a size of the first protrusion along the first direction is 1 mm to 8 mm, and a size of the first protrusion along the second direction is 1 mm to 4 mm; a size of the second groove along the first direction is 1 mm to 8 mm, and a size of the second groove along the second direction is 1 mm to 4 mm;

[0013] And / or, the size of the first groove along the first direction is 1mm-8mm, and the size of the first groove along the second direction is 1mm-4mm; the size of the second protrusion along the first direction is 1mm-8mm, and the size of the second protrusion along the second direction is 1mm-4mm.

[0014] In a possible implementation, in a plane perpendicular to the first direction and the second direction, the projection of the first protrusion, the projection of the first groove, the projection of the second protrusion, and the projection of the second groove are all in the shape of a triangle, a rectangle, or a trapezoid.

[0015] In a possible implementation, the surface roughness of the first protrusion, the surface roughness of the first groove, the surface roughness of the second protrusion, and the surface roughness of the second groove are all 0.5 μm-2 μm.

[0016] In a possible implementation, along the second direction, an electrolyte-resistant layer is further provided on the peripheral sides of the first electrode, the second electrode and the ion transport medium layer, and along the first direction, two ends of the electrolyte-resistant layer are respectively connected to the first bipolar current collector and the second bipolar current collector (200).

[0017] In a possible implementation, a first mounting groove is provided between the first electrode and the first sealing area, and the first mounting groove is provided around the first electrode;

[0018] A second mounting groove is provided between the second electrode and the second sealing area, and the second mounting groove is provided around the second electrode;

[0019] Along the first direction, two ends of the electrolyte-resistant layer are respectively located in the first installation groove and the second installation groove.

[0020] In one possible implementation, the material of the electrolyte-resistant layer includes resin, pigment, filler, additive, and solvent, wherein the mass percentage of the resin is 12-15%; the mass percentage of the pigment is 0.5-1%; the mass percentage of the filler is 5-8%; the mass percentage of the additive is 0.02-0.05%; and the mass percentage of the solvent is 70-80%.

[0021] In a possible implementation, the resin includes at least one of alkyd resin, phenolic resin, chlorinated rubber, acrylic resin, epoxy resin, polyurethane resin, and silicone resin;

[0022] The pigment is at least one of mica iron oxide, aluminum, zinc, phosphate, and sulfate;

[0023] The filler is at least one of chalk, mica, and clay;

[0024] The additive is at least one of a thixotropic agent, a surfactant, a defoaming agent, a wetting agent, a pigment dispersant, a bactericide, an antioxidant, and a corrosion inhibitor;

[0025] The solvent is at least one of xylene, benzyl alcohol, methyl amyl ketone, propyl acetate, and heptyl acetate.

[0026] In one possible implementation, the size of the first mounting groove along the first direction is 1mm-8mm, and the size of the first mounting groove along the second direction is 1mm-4mm; the size of the second mounting groove along the first direction is 1mm-8mm, and the size of the second mounting groove along the second direction is 1mm-4mm.

[0027] In a possible implementation, the first mounting groove abuts against the second mounting groove, and in a plane perpendicular to the first direction and the second direction, a projection of the electrolyte-resistant layer is triangular or rectangular.

[0028] On the other hand, the present application provides a bipolar battery, comprising a housing, wherein a positive electrode plate and a negative electrode plate are disposed within the housing, and at least one bipolar current collector assembly as described above is disposed between the positive electrode plate and the negative electrode plate.

[0029] On the other hand, the present application provides an electrical device including the bipolar battery as described above.

[0030] The present application provides a bipolar current collector assembly, a bipolar battery and an electrical device. The bipolar current collector assembly includes a first bipolar current collector and a second bipolar current collector arranged opposite to each other. Along a first direction, the first bipolar current collector includes a first surface facing the second bipolar current collector, and a first electrode is provided on the first surface. The second bipolar current collector includes a second surface facing the first bipolar current collector, and a second electrode compatible with the first electrode is provided on the second surface. An ion transport medium layer is provided between the first electrode and the second electrode; a first sealing area is also provided on the first surface, and along the second direction, the first sealing area is located at the periphery of the first electrode; a second sealing area is also provided on the second surface, and along the second direction, the second sealing area is located at the periphery of the second electrode; the first sealing area is provided with a first protrusion and / or a first groove; the second sealing area is provided with a second groove and / or a second protrusion; the first protrusion corresponds to the second groove, and the first groove corresponds to the second protrusion; the first protrusion is inserted into the second groove, and / or the second protrusion is inserted into the first groove to seal the first sealing area with the second sealing area. The present application provides a first protrusion and / or a first groove in the first sealing area, and a second groove and / or a second protrusion in the second sealing area, the first protrusion corresponds to the second groove, the first groove corresponds to the second protrusion, the first protrusion is inserted into the second groove, and / or the second protrusion is inserted into the first groove to seal the first sealing area and the second sealing area. The protrusion and groove structure that match in the first sealing area and the second sealing area is thereby utilized to increase the distance for the ion transport medium to penetrate outward, effectively prevent the ion transport medium from penetrating and diffusing outward, reduce the probability of leakage of the ion transport medium, and extend the service life of the bipolar battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 Schematic diagram of the structure of the first bipolar current collector and the second bipolar current collector in the related art;

[0033] Figure 2 A schematic diagram of a bipolar current collector assembly in the related art;

[0034] Figure 3 A simplified structural diagram of a first bipolar current collector and a second bipolar current collector provided in one embodiment of the present application;

[0035] Figure 4 A simplified diagram of a bipolar current collector assembly provided in one embodiment of the present application;

[0036] Figure 5 An axonometric diagram of a first bipolar current collector provided in one embodiment of the present application;

[0037] Figure 6 A simplified structural diagram of a first bipolar current collector and a second bipolar current collector provided in another embodiment of the present application;

[0038] Figure 7 A simplified diagram of a bipolar current collector assembly provided in another embodiment of the present application;

[0039] Figure 8 A simplified structural diagram of a first bipolar current collector and a second bipolar current collector provided in yet another embodiment of the present application;

[0040] Figure 9 A simplified diagram of a bipolar current collector assembly provided in yet another embodiment of the present application;

[0041] Figure 10 A simplified structural diagram of a first bipolar current collector and a second bipolar current collector provided in yet another embodiment of the present application;

[0042] Figure 11 A simplified diagram of a bipolar current collector assembly provided in yet another embodiment of the present application.

[0043] Reference numerals:

[0044] 10-first bipolar current collector; 11-first electrode;

[0045] 20-second bipolar current collector; 21-second electrode;

[0046] 30-sealing ring;

[0047] 100 - first bipolar current collector; 110 - first electrode; 120 - first sealing area; 121 - first protrusion; 122 - first groove; 130 - first mounting groove;

[0048] 200 - second bipolar current collector; 210 - second electrode; 220 - second sealing area; 221 - second groove; 222 - second protrusion; 230 - second mounting groove;

[0049] 300-electrolyte resistant layer;

[0050] 400-sealing medium layer;

[0051] X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0053] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0054] As described in the background art, after a period of use, the sealing structure for sealing the bipolar current collector in the bipolar battery of the related art is prone to failure, thereby causing leakage of the electrolyte. Specifically, Figure 1 Schematic diagram of the structure of the first bipolar current collector and the second bipolar current collector in the related art; Figure 2 Figure 1 is a simplified diagram of a bipolar current collector assembly in the related art. Figure 1 and Figure 2 As shown, the first electrode 11 of the first bipolar current collector 10 is arranged opposite to the second electrode 21 of the second bipolar current collector 20, wherein the polarity of the first electrode 11 is opposite to that of the second electrode 21. A diaphragm (not shown in the figure) is also provided between the first electrode 11 and the second electrode 21 to separate the first electrode 11 and the second electrode 21. An electrolyte layer (not shown in the figure) is provided on the surface of the diaphragm, and the electrolyte layer is used to participate in ion exchange and energy conversion during the charging and discharging process of the battery. A sealing structure such as a sealing ring 30 is also provided between the first bipolar current collector 10 and the second bipolar current collector 20. The sealing structure is located on the outer peripheral side of the first electrode 11 and the second electrode 21, and the two ends of the sealing structure are respectively connected to the first bipolar current collector 10 and the second bipolar current collector 20. However, after the bipolar battery has been used for a period of time, the electrolyte in the electrolyte layer between the first electrode 11 and the second electrode 21 will gradually flow to the sealing ring 30, thereby corroding the sealing ring 30, especially at the junction surface between the sealing ring 30 and the first bipolar current collector 10 or the second bipolar current collector 20. Since the material of the sealing ring 30 is different from that of the first bipolar current collector 10 and the second bipolar current collector 20, a weak connection area is easily formed at the junction surface, and the electrolyte can easily penetrate outward through this area, thereby causing leakage.

[0055] In view of this, the embodiments of the present application aim to provide a bipolar current collector assembly, a bipolar battery and an electrical device, by providing a first protrusion and / or a first groove in the first sealing area, and providing a second groove and / or a second protrusion in the second sealing area, the first protrusion corresponds to the second groove, the first groove corresponds to the second protrusion, the first protrusion is inserted into the second groove, and / or the second protrusion is inserted into the first groove to seal the first sealing area and the second sealing area. The protrusion and groove structure that match in the first sealing area and the second sealing area is thereby utilized to increase the distance for the ion transmission medium to penetrate outward, effectively preventing the ion transmission medium from penetrating and diffusing outward, reducing the probability of leakage of the ion transmission medium, and extending the service life of the bipolar battery.

[0056] The following is a detailed description of the embodiments of the present application in conjunction with the accompanying drawings so that those skilled in the art can understand the contents of the present application in more detail. It should be noted that in the description of this embodiment, the first direction X, the second direction Y, and the third direction Z are three different directions in a three-dimensional space. For example, the first direction X, the second direction Y, and the third direction Z can be three different directions that are perpendicular to each other in the three-dimensional space.

[0057] Please refer to Figure 3-Figure 11 This embodiment provides a bipolar current collector assembly, comprising a first bipolar current collector 100 and a second bipolar current collector 200 disposed opposite each other. Along a first direction X, the first bipolar current collector 100 includes a first surface facing the second bipolar current collector 200, on which a first electrode 110 is disposed. In an exemplary embodiment, the first electrode 110 may be a positive electrode. The second bipolar current collector 200 includes a second surface facing the first bipolar current collector 100, on which a second electrode 210 compatible with the first electrode 110 is disposed. In an exemplary embodiment, the second electrode may be a negative electrode. To prevent direct contact between the first electrode 110 and the second electrode 210, a separator (not shown in the figure) is disposed between the first electrode 110 and the second electrode 210. An ion transport medium layer (not shown in the figure) is disposed on the surfaces of the separator facing the first electrode 110 and the second electrode 210. The separator prevents the free flow of electrons while allowing ions in the electrolyte to pass freely between the first electrode 110 and the second electrode 210.

[0058] It will be understood that in this embodiment, "first" and "second" are only used to distinguish between two adjacent bipolar current collectors, and the structures, materials, etc. of the two can be exactly the same. Taking the first bipolar current collector 100 as an example, the first bipolar current collector 100 can be made of a metal material, for example, copper (Cu) or aluminum (Al). The first electrode 110 is a positive electrode and can be made of aluminum. In the first direction X, a second electrode is also provided on the other side of the first bipolar current collector 100. The second electrode is a negative electrode and can be made of copper. The first bipolar current collector 100, the first electrode 110, and the second electrode can be integrally formed. In other possible embodiments, the first electrode and the second electrode can also be made of metals including nickel (Ni), titanium (Ti), silver (Ag), gold (Au), platinum (Pt), cobalt (Co), chromium (Cr), tungsten (W), molybdenum (Mo), magnesium (Mg), and their alloys. The first bipolar current collector 100 can also be a polymer film such as polyethylene terephthalate or polyimide. The diaphragm can be made of polyethylene, polypropylene, ceramic, etc. The ion transport medium layer can be formed of an electrolyte layer or a semi-solid electrolyte layer. The ion transport medium can be, for example, a liquid electrolyte, a solid electrolyte, an ionic liquid electrolyte, a gel electrolyte, etc.

[0059] In this embodiment, a first sealing area 120 is further provided on the first surface. Along the second direction Y, the first sealing area 120 is located at the periphery of the first electrode 110. In other words, the first sealing area 120 is provided around the first electrode 110. A second sealing area 220 is further provided on the second surface. Along the second direction Y, the second sealing area 220 is located at the periphery of the second electrode 210. In other words, the second sealing area 220 is provided around the second electrode 210.

[0060] The first sealing area 120 is provided with a first protrusion 121 and / or a first groove 122; the second sealing area 220 is provided with a second groove 221 and / or a second protrusion 222; the first protrusion 121 corresponds to the second groove 221, and the first groove 122 corresponds to the second protrusion 222; the first protrusion 121 is inserted into the second groove 221, and / or the second protrusion 222 is inserted into the first groove 122 to seal the first sealing area 120 and the second sealing area 220.

[0061] In this embodiment, a first protrusion 121 and / or a first groove 122 is provided in the first sealing area 120, and a second groove 221 and / or a second protrusion 222 is provided in the second sealing area 220. The first protrusion 121 corresponds to the second groove 221, and the first groove 122 corresponds to the second protrusion 222. The first protrusion 121 is inserted into the second groove 221, and / or the second protrusion 222 is inserted into the first groove 122 to seal the first sealing area 120 and the second sealing area 220. The protrusion and groove structures that match in the first sealing area 120 and the second sealing area 220 are used to increase the distance for the ion transport medium to penetrate outward, effectively prevent the ion transport medium from penetrating and diffusing outward, reduce the probability of leakage of the ion transport medium, and extend the service life of the bipolar battery.

[0062] Please continue to refer to Figure 3-Figure 11 In this embodiment, the first sealing area 120 is provided with a plurality of first protrusions 121 and / or a plurality of first grooves 122. Correspondingly, the second sealing area 220 is provided with a plurality of second grooves 221 and / or a plurality of second protrusions 222. The plurality of first protrusions 121 correspond one-to-one with the plurality of second grooves 221, and the plurality of first grooves 122 correspond one-to-one with the plurality of second protrusions 222.

[0063] When connecting the first bipolar current collector 100 and the second bipolar current collector 200, the first protrusions 121 are inserted into the corresponding second grooves 221, and / or the second protrusions 222 are inserted into the corresponding first grooves 122, and then the connection is sealed by the sealing medium layer 400. For example, the sealing medium layer 400 can be pre-filled on the surfaces of the first sealing area 120 and the second sealing area 220, and after the first protrusions 121 are inserted into the corresponding second grooves 221 and / or the second protrusions 222 are inserted into the corresponding first grooves 122, the sealing medium layer 400 is pressed together with the first sealing area 120 and the second sealing area 220 through a process such as hot pressing to achieve a sealed connection.

[0064] Through the above structure, this embodiment increases the distance that the ion transmission medium penetrates outward (that is, when the ion transmission medium penetrates outward, it needs to pass along the gap between the first protrusion 121 and the second groove 221, and the gap between the second protrusion 222 and the first groove 122), thereby effectively extending the failure time of the sealing medium layer 400 and further improving the sealing performance.

[0065] In this embodiment, the sealing medium layer 400 includes a polyethylene adhesive layer, a polyurethane adhesive layer or an epoxy resin adhesive layer, thereby ensuring that the sealing medium layer 400 can bond the first sealing area 120 and the second sealing area 220 together in a molten state to form a sealing structure.

[0066] For example, the dimensions of the first protrusion 121 in this embodiment along the first direction X are 1mm-8mm, and may further be 2mm-4mm; the dimensions of the first protrusion 121 along the second direction Y are 1mm-4mm, and may further be 1mm-2mm. Accordingly, the dimensions of the second groove 221 along the first direction X are 1mm-8mm, and may further be 2mm-4mm; the dimensions of the second groove 221 along the second direction Y are 1mm-4mm, and may further be 1mm-2mm. It will be appreciated that the dimensions of the first protrusion 121 in both the first and second directions Y are slightly smaller than the dimensions of the second groove 221 in both the first and second directions Y, thereby ensuring that the first protrusion 121 can be smoothly inserted into the corresponding second groove 221.

[0067] Similarly, the dimension of the second protrusion 222 along the first direction X is 1 mm to 8 mm, and can further be 2 mm to 4 mm; the dimension of the second protrusion 222 along the second direction Y is 1 mm to 4 mm, and can further be 1 mm to 2 mm. Accordingly, the dimension of the first groove 122 along the first direction X is 1 mm to 8 mm, and can further be 2 mm to 4 mm; the dimension of the first groove 122 along the second direction Y is 1 mm to 4 mm, and can further be 1 mm to 2 mm. It will be understood that the dimensions of the second protrusion 222 in both the first direction X and the second direction Y are slightly smaller than the dimensions of the first groove 122 in both the first direction X and the second direction Y, thereby ensuring that the second protrusion 222 can be smoothly inserted into the corresponding first groove 122.

[0068] In this embodiment, the sizes of the first protrusion 121, the first groove 122, the second protrusion 222, and the second groove 221 are limited to the above ranges, which can ensure that the first sealing area 120 and the second sealing area 220 have good structural strength, effectively prevent the ion transport medium from penetrating outward, and maintain a low manufacturing cost.

[0069] Please continue to refer to Figure 4 、 Figure 7 、 Figure 9 and Figure 11 In this embodiment, within a plane perpendicular to the first direction X and the second direction Y, the projections of the first protrusion 121, the first groove 122, the second protrusion 222, and the second groove 221 are all triangular, rectangular, or trapezoidal. Alternatively, the projections of the first protrusion 121, the first groove 122, the second protrusion 222, and the second groove 221 are all rectangular. This cross-sectional shape ensures a long permeation distance for the ion transport medium and a large contact area between the first protrusion 121 and the second groove 221, and between the second protrusion 222 and the first groove 122.

[0070] In this embodiment, the surface roughness of the first protrusion 121, the surface roughness of the first groove 122, the surface roughness of the second protrusion 222, and the surface roughness of the second groove 221 are all within a range of 0.5 μm to 2 μm, and can further be within a range of 1 μm to 2 μm. Setting the surface roughness of the first protrusion 121, the first groove 122, the second protrusion 222, and the second groove 221 within the above range can improve the interfacial bonding strength with the sealing dielectric layer 400 and reduce the weak connection area at the junction with the sealing dielectric layer 400, thereby improving the packaging strength and enhancing the reliability and safety of the seal.

[0071] Figure 5 The structure of the first bipolar current collector 100 under an optional implementation manner of this embodiment is shown. Figure 5 As shown, the first bipolar current collector 100 of this embodiment can be generally rectangular in shape, and the first electrode 110 is also generally rectangular in shape and is disposed on the first surface of the first bipolar current collector, with the first electrode 110 being generally located in the middle of the first bipolar current collector 100. The first mounting groove 130 is square-ring-shaped and surrounds the outer periphery of the first electrode 110. The first sealing area 120 is provided with a plurality of first protrusions 121 and a plurality of first grooves 122 extending along the second direction Y. The plurality of first protrusions 121 and the plurality of first grooves 122 are staggered along the third direction Z and are located on both sides of the first electrode 110. The first sealing area 120 is also provided with a plurality of first protrusions 121 and a plurality of first grooves 122 extending along the third direction Z. The plurality of first protrusions 121 and the plurality of first grooves 122 are staggered along the second direction Y and are located on both sides of the first electrode 110; the first protrusions 121 and the first grooves 122 arranged along the third direction Z have their two ends respectively abutted against the first protrusions 121 and the first grooves 122 arranged along the second direction Y.

[0072] It is understandable that Figure 5 Only one optional embodiment of the first bipolar current collector 100 is shown. In other possible embodiments, the first electrode 110 may be cylindrical, and the corresponding first mounting groove 130 , first protrusion 121 , and first groove 122 may all be annular.

[0073] Please continue to refer to Figure 4 、 Figure 7 、 Figure 9 and Figure 11Furthermore, an electrolyte-resistant layer 300 is provided on the outer periphery of the first electrode 110, the second electrode 210, and the ion transport medium layer along the second direction Y. Along the first direction X, the two ends of the electrolyte-resistant layer 300 are connected to the first bipolar current collector 100 and the second bipolar current collector 200, respectively. It will be appreciated that the electrolyte-resistant layer 300 surrounds the outer periphery of the first electrode 110, the second electrode 120, and the ion transport medium layer, thereby enabling the electrolyte-resistant layer 300 to seal the ion transport medium layer, effectively preventing the outward penetration and diffusion of the ion transport medium and reducing the probability of leakage of the ion transport medium.

[0074] Specifically, in this embodiment, a first mounting groove 130 is provided between the first electrode 110 and the first sealing area 120 , and the first mounting groove 130 is provided around the first electrode 110 . A second mounting groove 230 is provided between the second electrode 210 and the second sealing area 220 , and the second mounting groove 230 is provided around the second electrode 210 .

[0075] Along the first direction X, the ends of the electrolyte-resistant layer 300 are located within the first mounting groove 130 and the second mounting groove 230, respectively, and the first mounting groove 130 and the second mounting groove 230 are completely filled, thereby ensuring a good sealing effect. The first mounting groove 130 and the second mounting groove 230 extend the path for the ion transport medium in the ion transport medium layer to penetrate outward, which helps further reduce the probability of ion transport medium leakage.

[0076] In this embodiment, the materials of the electrolyte-resistant layer 300 include resin, pigment, filler, additive, and solvent. The mass percentage of the resin is 12-15%, the mass percentage of the pigment is 0.5-1%, the mass percentage of the filler is 5-8%, the mass percentage of the additive is 0.02-0.05%, and the mass percentage of the solvent is 70-80%. The electrolyte-resistant layer 300 of this embodiment is formed by mixing the resin, pigment, filler, additive, and solvent, and the ratio of each material is maintained within the above-mentioned corresponding ranges, thereby ensuring that the electrolyte-resistant layer 300 has excellent ability to prevent leakage of the ion transport medium.

[0077] Illustratively, the resin in this embodiment includes at least one of alkyd resin, phenolic resin, chlorinated rubber, acrylic resin, epoxy resin, polyurethane resin, and silicone resin.

[0078] The pigment is at least one of mica iron oxide, aluminum, zinc, phosphate and sulfate.

[0079] The filler is at least one of chalk, mica and clay.

[0080] The additive is at least one of a thixotropic agent, a surfactant, a defoaming agent, a wetting agent, a pigment dispersant, a bactericide, an antioxidant, and a corrosion inhibitor.

[0081] The solvent is at least one of xylene, benzyl alcohol, methyl amyl ketone, propyl acetate, and heptyl acetate.

[0082] For example, in this embodiment, the dimension of the first mounting groove 130 along the first direction X is 1 mm to 8 mm, and may further be 3 mm to 5 mm. The dimension of the first mounting groove 130 along the second direction Y is 1 mm to 4 mm, and may further be 2 mm to 4 mm. Correspondingly, the dimension of the second mounting groove 230 along the first direction X is 1 mm to 8 mm, and may further be 3 mm to 5 mm. The dimension of the second mounting groove 230 along the second direction Y is 1 mm to 4 mm, and may further be 2 mm to 4 mm.

[0083] In this embodiment, the sizes of the first installation groove 130 and the second installation groove 230 are limited to the above range, which can ensure that the electrolyte-resistant layer 300 has a good effect of preventing the ion transport medium from penetrating outward, and also makes the electrolyte-resistant layer 300 have a lower cost.

[0084] Please continue to refer to Figure 4 、 Figure 7 、 Figure 9 and Figure 11 In this embodiment, the first mounting groove 130 abuts the second mounting groove 230. The projection of the electrolyte-resistant layer 300 in a plane perpendicular to the first direction X and the second direction Y is triangular or rectangular. Alternatively, the projection of the electrolyte-resistant layer 300 is triangular, with the hypotenuse of the triangle adjacent to the first electrode 110, the second electrode 210, and the ion transport medium layer. Providing the electrolyte-resistant layer 300 with a triangular cross-section can ensure a smaller volume of the electrolyte-resistant layer 300, thereby saving costs.

[0085] Specific examples of the bipolar current collector assembly of this embodiment are given below.

[0086] Example 1

[0087] like Figure 6As shown, the first sealing area 120 of the first bipolar current collector 100 is provided with a plurality of first protrusions 121 and a plurality of first grooves 122. The projections of the first protrusions 121 and the first grooves 122 on a plane perpendicular to the first direction X and the second direction Y each form an isosceles triangle. The dimensions of the first protrusions 121 along the first direction X are 2 mm, and the dimensions of the first protrusions 121 along the second direction Y are 2 mm; the dimensions of the first grooves 122 along the first direction X are 2.5 mm, and the dimensions of the first grooves 122 along the second direction Y are 2.5 mm. The surface roughness of the first protrusions 121 and the first grooves 122 are both 1 μm. The first mounting groove 130 outside the first electrode 110 is 3 mm in the first direction X and 4 mm in the second direction Y. The projection of the first mounting groove 130 on a plane perpendicular to the first direction X and the second direction Y is a rectangle.

[0088] The second sealing area 220 of the second bipolar current collector 200 is provided with multiple second protrusions 222 and multiple second grooves 221. The projections of the second protrusions 222 and the second grooves 221 onto a plane perpendicular to the first direction X and the second direction Y each form an isosceles triangle. The dimensions of the second protrusions 222 along the first direction X and the second direction Y are both 2 mm. The dimensions of the second grooves 221 along the first direction X and the second direction Y are both 2.5 mm. The surface roughness of both the second protrusions 222 and the second grooves 221 is 1 μm. The second mounting groove 230 outside the second electrode 210 measures 3 mm along the first direction X and 4 mm along the second direction Y. The projections of the second mounting groove 230 onto a plane perpendicular to the first direction X and the second direction Y are rectangular.

[0089] When the first bipolar current collector 100 and the second bipolar current collector 200 are sealed and connected, the electrolyte-resistant layer 300 is first filled in the first installation groove 130 and the second installation groove 230; the mass percentage of the resin in the electrolyte-resistant layer 300 is 14%; the mass percentage of the pigment is 1%; the mass percentage of the filler is 6%; the mass percentage of the additive is 0.03%; and the mass percentage of the solvent is 78.97%. Subsequently, the sealing medium is filled on the surface of the first sealing area 120 and the second sealing area 220; the sealing medium is polyethylene glue. Finally, the first bipolar current collector 100 and the second bipolar current collector 200 are pressed together through a hot pressing process, so that the first protrusion 121 is inserted into the corresponding second groove 221, and the second protrusion 222 is inserted into the corresponding first groove 122. The sealing medium forms a sealing medium layer and seals the first bipolar current collector 100 and the second bipolar current collector 200 to form. Figure 7 The structure shown.

[0090] Example 2

[0091] like Figure 8 As shown, the first sealing area 120 of the first bipolar current collector 100 is provided with a plurality of first protrusions 121 and a plurality of first grooves 122. The projections of the first protrusions 121 and the first grooves 122 on a plane perpendicular to the first direction X and the second direction Y are both rectangular. The dimensions of the first protrusions 121 along the first direction X are 1.5 mm, and the dimensions of the first protrusions 121 along the second direction Y are 1.5 mm. The dimensions of the first grooves 122 along the first direction X are 2 mm, and the dimensions of the first grooves 122 along the second direction Y are 2 mm. The surface roughness of the first protrusions 121 and the first grooves 122 are both 2 μm. The first mounting groove 130 outside the first electrode 110 is 2 mm in the first direction X and 4 mm in the second direction Y. The projections of the first mounting groove 130 on a plane perpendicular to the first direction X and the second direction Y are triangular.

[0092] The second sealing area 220 of the second bipolar current collector 200 is provided with multiple second protrusions 222 and multiple second grooves 221. The projections of the second protrusions 222 and second grooves 221 onto a plane perpendicular to the first direction X and the second direction Y are both rectangular. The dimensions of the second protrusions 222 along the first direction X are 1.5 mm, and the dimensions of the second protrusions 222 along the second direction Y are 1.5 mm. The dimensions of the second grooves 221 along the first direction X are 2 mm, and the dimensions of the second grooves 221 along the second direction Y are 2 mm. The surface roughness of the second protrusions 222 and the second grooves 221 are both 2 μm. The second mounting groove 230 outside the second electrode 210 has a dimension of 2 mm along the first direction X and a dimension of 4 mm along the second direction Y. The projections of the second mounting grooves 230 onto a plane perpendicular to the first direction X and the second direction Y are triangular.

[0093] When the first bipolar current collector 100 and the second bipolar current collector 200 are sealed and connected, the electrolyte-resistant layer 300 is first filled in the first installation groove 130 and the second installation groove 230; the mass percentage of the resin in the electrolyte-resistant layer 300 is 13%; the mass percentage of the pigment is 0.8%; the mass percentage of the filler is 7%; the mass percentage of the additive is 0.04%; and the mass percentage of the solvent is 79.16%. Subsequently, the sealing medium is filled on the surface of the first sealing area 120 and the second sealing area 220; the sealing medium is epoxy resin glue. Finally, the first bipolar current collector 100 and the second bipolar current collector 200 are pressed together through a hot pressing process, so that the first protrusion 121 is inserted into the corresponding second groove 221, and the second protrusion 222 is inserted into the corresponding first groove 122. The sealing medium forms a sealing medium layer and seals the first bipolar current collector 100 and the second bipolar current collector 200 to form. Figure 9The structure shown.

[0094] Example 3

[0095] like Figure 10 As shown, the first sealing area 120 of the first bipolar current collector 100 is provided with a plurality of first protrusions 121 and a plurality of first grooves 122. The projections of the first protrusions 121 and the first grooves 122 onto a plane perpendicular to the first direction X and the second direction Y are both isosceles trapezoidal. The dimension of the first protrusion 121 along the first direction X is 3.5 mm, with an upper base of 2 mm and a lower base of 3 mm. The dimension of the first groove 122 along the first direction X is 4 mm, with an upper base of 2.5 mm and a lower base of 3.5 mm. The surface roughness of both the first protrusion 121 and the first groove 122 is 2 μm. The first mounting groove 130 outside the first electrode 110 is 6 mm along the first direction X and 4 mm along the second direction Y. The projection of the first mounting groove 130 onto a plane perpendicular to the first direction X and the second direction Y is rectangular.

[0096] The second sealing area 220 of the second bipolar current collector 200 is equipped with multiple second protrusions 222 and multiple second grooves 221. The projections of the second protrusions 222 and second grooves 221 onto a plane perpendicular to the first direction X and the second direction Y are both isosceles trapezoidal. The second protrusions 222 measure 3.5 mm along the first direction X, with an upper base of 2 mm and a lower base of 3 mm. The second grooves 221 measure 4 mm along the first direction X, with an upper base of 2.5 mm and a lower base of 3.5 mm. The surface roughness of both the second protrusions 222 and the second grooves 221 is 2 μm. The second mounting groove 230 outside the second electrode 210 measures 6 mm along the first direction X and 4 mm along the second direction Y. The projections of the second mounting grooves 230 onto a plane perpendicular to the first direction X and the second direction Y are rectangular.

[0097] When the first bipolar current collector 100 and the second bipolar current collector 200 are sealed and connected, the electrolyte-resistant layer 300 is first filled in the first installation groove 130 and the second installation groove 230; the mass percentage of the resin in the electrolyte-resistant layer 300 is 15%; the mass percentage of the pigment is 0.5%; the mass percentage of the filler is 8%; the mass percentage of the additive is 0.05%; and the mass percentage of the solvent is 76.45%. Subsequently, the sealing medium is filled on the surface of the first sealing area 120 and the second sealing area 220; the sealing medium is polyurethane glue. Finally, the first bipolar current collector 100 and the second bipolar current collector 200 are pressed together through a hot pressing process, so that the first protrusion 121 is inserted into the corresponding second groove 221, and the second protrusion 222 is inserted into the corresponding first groove 122. The sealing medium forms a sealing medium layer and seals the first bipolar current collector 100 and the second bipolar current collector 200 to form. Figure 11 The structure shown.

[0098] This embodiment further provides a bipolar battery, including a housing, wherein a positive electrode plate and a negative electrode plate are disposed within the housing, and at least one bipolar current collector assembly is disposed between the positive electrode plate and the negative electrode plate.

[0099] It is understood that the presence of the bipolar current collector reduces the number of grids and component weight in the battery, making the bipolar battery structure more compact and thus having a higher energy density. Due to the use of the above-mentioned bipolar current collector assembly, the bipolar battery in this embodiment can effectively reduce the probability of leakage of the ion transport medium during use.

[0100] This embodiment also provides an electrical device, including the above bipolar battery.

[0101] Specifically, the electrical equipment of this embodiment can be an energy storage device or a new energy vehicle. Since the above-mentioned bipolar battery is used, the electrical equipment has a higher energy density, thereby improving the energy storage capacity or endurance, and the ion transmission medium in the battery is not easy to leak, thereby improving the safety of use.

[0102] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0103] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0104] It should be noted that in the description of this application, the terms "first" and "second" are used solely to facilitate the description of different components and should not be understood to indicate or imply a sequential relationship, relative importance, or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of such features.

[0105] The various embodiments or implementation methods in this application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0106] In the description of this application, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this application, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A bipolar current collector assembly, characterized in that: The invention comprises a first bipolar current collector (100) and a second bipolar current collector (200) arranged opposite to each other, wherein along a first direction, the first bipolar current collector (100) comprises a first surface facing the second bipolar current collector (200), a first electrode (110) is provided on the first surface, and the second bipolar current collector (200) comprises a second surface facing the first bipolar current collector (100), a second electrode (210) adapted to the first electrode (110) is provided on the second surface, and an ion transport medium layer is provided between the first electrode (110) and the second electrode (210); A first sealing area (120) is further provided on the first surface, and along the second direction, the first sealing area (120) is located on the periphery of the first electrode (110); a second sealing area (220) is further provided on the second surface, and along the second direction, the second sealing area (220) is located on the periphery of the second electrode (210); The first sealing area (120) is provided with a first protrusion (121) and / or a first groove (122); the second sealing area (220) is provided with a second groove (221) and / or a second protrusion (222); the first protrusion (121) corresponds to the second groove (221), and the first groove (122) corresponds to the second protrusion (222); the first protrusion (121) is inserted into the second groove (221), and / or the second protrusion (222) is inserted into the first groove (122) so that the first sealing area (120) and the second sealing area (220) are sealed and connected.

2. The bipolar current collector assembly according to claim 1, characterized in that: The first sealing area (120) is provided with a plurality of first protrusions (121) and / or a plurality of first grooves (122); the second sealing area (220) is provided with a plurality of second grooves (221) and / or a plurality of second protrusions (222); the plurality of first protrusions (121) correspond one-to-one to the plurality of second grooves (221), and the plurality of first grooves (122) correspond one-to-one to the plurality of second protrusions (222); The first protrusion (121) is inserted into the corresponding second groove (221), and / or the second protrusion (222) is inserted into the corresponding first groove (122) and then sealed and connected via a sealing medium layer (400).

3. The bipolar current collector assembly according to claim 2, characterized in that: The sealing medium layer (400) comprises a polyethylene adhesive layer, a polyurethane adhesive layer or an epoxy resin adhesive layer.

4. The bipolar current collector assembly according to claim 1, characterized in that: The size of the first protrusion (121) along the first direction is 1mm-8mm, and the size of the first protrusion (121) along the second direction is 1mm-4mm; the size of the second groove (221) along the first direction is 1mm-8mm, and the size of the second groove (221) along the second direction is 1mm-4mm; And / or, the size of the first groove (122) along the first direction is 1mm-8mm, and the size of the first groove (122) along the second direction is 1mm-4mm; the size of the second protrusion (222) along the first direction is 1mm-8mm, and the size of the second protrusion (222) along the second direction is 1mm-4mm.

5. The bipolar current collector assembly according to claim 1, characterized in that: In a plane perpendicular to the first direction and the second direction, the projection of the first protrusion (121), the projection of the first groove (122), the projection of the second protrusion (222), and the projection of the second groove (221) are in the shape of a triangle, a rectangle, or a trapezoid.

6. The bipolar current collector assembly according to claim 1, characterized in that: The surface roughness of the first protrusion (121), the surface roughness of the first groove (122), the surface roughness of the second protrusion (222), and the surface roughness of the second groove (221) are all 0.5 μm-2 μm.

7. The bipolar current collector assembly according to any one of claims 1 to 6, characterized in that: An electrolyte-resistant layer (300) is further provided on the outer peripheral sides of the first electrode (110), the second electrode (210) and the ion transport medium layer along the second direction, and two ends of the electrolyte-resistant layer (300) are respectively connected to the first bipolar current collector (100) and the second bipolar current collector (200) along the first direction.

8. The bipolar current collector assembly according to claim 7, characterized in that: A first mounting groove (130) is provided between the first electrode (110) and the first sealing area (120), and the first mounting groove (130) is provided around the first electrode (110); A second mounting groove (230) is provided between the second electrode (210) and the second sealing area (220), and the second mounting groove (230) is provided around the second electrode (210); Along the first direction, two ends of the electrolyte-resistant layer (300) are respectively located in the first installation groove (130) and the second installation groove (230).

9. The bipolar current collector assembly according to claim 8, characterized in that: The material of the electrolyte-resistant layer (300) includes resin, pigment, filler, additive, and solvent; wherein the mass percentage of the resin is 12-15%; the mass percentage of the pigment is 0.5-1%; the mass percentage of the filler is 5-8%; the mass percentage of the additive is 0.02-0.05%; and the mass percentage of the solvent is 70-80%.

10. The bipolar current collector assembly according to claim 9, characterized in that: The resin includes at least one of alkyd resin, phenolic resin, chlorinated rubber, acrylic resin, epoxy resin, polyurethane resin, and silicone resin; The pigment is at least one of mica iron oxide, aluminum, zinc, phosphate, and sulfate; The filler is at least one of chalk, mica, and clay; The additive is at least one of a thixotropic agent, a surfactant, a defoaming agent, a wetting agent, a pigment dispersant, a bactericide, an antioxidant, and a corrosion inhibitor; The solvent is at least one of xylene, benzyl alcohol, methyl amyl ketone, propyl acetate, and heptyl acetate.

11. The bipolar current collector assembly according to claim 8, characterized in that: The size of the first mounting groove (130) along the first direction is 1mm-8mm, and the size of the first mounting groove (130) along the second direction is 1mm-4mm; the size of the second mounting groove (230) along the first direction is 1mm-8mm, and the size of the second mounting groove (230) along the second direction is 1mm-4mm.

12. The bipolar current collector assembly according to claim 8, characterized in that: The first installation groove (130) abuts against the second installation groove (230), and in a plane perpendicular to the first direction and the second direction, the projection of the electrolyte-resistant layer (300) is triangular or rectangular.

13. A bipolar battery, characterized in that: The invention comprises a shell, wherein a positive plate and a negative plate are arranged in the shell, and at least one bipolar current collector assembly according to any one of claims 1 to 12 is arranged between the positive plate and the negative plate.

14. An electrical device, characterized in that: Comprising the bipolar battery as claimed in claim 13.

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