Bipolar battery, battery module and electric equipment

Abstract

The invention relates to the technical field of battery assembling and manufacturing, in particular to a bipolar battery, a battery module and electric equipment. The bipolar battery comprises a negative pole plate, a positive pole plate, and a bipolar plate comprising a first pole plate, a second pole plate and a conductive connecting plate, the first pole plate of the bipolar plate is provided with a groove, a diaphragm is arranged in the groove, the second pole plate of the bipolar plate is provided with a boss, the boss is accommodated in the adjacent groove, and a sealing gasket and electrolyte are arranged in the groove. According to the bipolar current collector, the groove is formed in the first pole plate of the bipolar plate, the electrolyte is arranged in the groove, the action range of the electrolyte can be effectively controlled, the electrolyte in the groove is difficult to permeate and diffuse to the outside, and the sealing gaskets are arranged among the negative pole plate, the bipolar plate and the positive pole plate to seal and insulate the bipolar current collector, so that the service life of the bipolar current collector is prolonged. Due to the fact that the electrolyte is arranged in the groove and does not make contact with the sealing gasket, the problem of liquid leakage possibly occurring during long-time use in an adhesive sealing scheme can be avoided.

Description

Technical Field

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

[0002] With the development of battery technology, batteries have been widely used in many fields. To increase the output voltage and energy density of batteries, bipolar battery technology can be used. By using bipolar plates with positive and negative electrodes, charging and discharging can be carried out simultaneously, thus shortening the current path and improving battery performance.

[0003] However, existing bipolar batteries are usually sealed and bonded with sealants. After a certain period of use, the adhesive joints are easily penetrated by the electrolyte, resulting in seal failure and leakage. Summary of the Invention

[0004] Based on this, the present application provides a bipolar battery, a battery module and an electrical device to solve the problem of sealing failure and leakage caused by long-term use of sealant adhesive sealing solutions.

[0005] In one aspect, the present application provides a bipolar battery, comprising:

[0006] negative electrode plate;

[0007] positive electrode plate;

[0008] At least one bipolar plate, the bipolar plate being stacked between the negative electrode plate and the positive electrode plate, the bipolar plate comprising a first electrode plate, a second electrode plate, and a conductive connecting plate, the conductive connecting plate being connected between the first electrode plate and the second electrode plate in the same bipolar plate, the negative electrode plate being opposite to the second electrode plate of the adjacent bipolar plate, and the positive electrode plate being opposite to the first electrode plate of the adjacent bipolar plate;

[0009] A groove is provided on the first electrode plate or the second electrode plate of the bipolar plate, a diaphragm is provided in the groove, and a boss is provided on the other of the first electrode plate and the second electrode plate of the bipolar plate, and the boss is accommodated in the adjacent groove;

[0010] Sealing gaskets, which are arranged on both sides of the bipolar plate;

[0011] The electrolyte is arranged in the groove.

[0012] In one possible implementation, a groove is provided on the negative electrode plate, a diaphragm is provided in the groove, and the boss of the bipolar plate is accommodated in the groove of the adjacent negative electrode plate; and / or

[0013] A boss is provided on the positive electrode plate, and the boss of the positive electrode plate is accommodated in the groove of the adjacent bipolar plate.

[0014] In a possible implementation, a sealing hole is provided on the sealing gasket, and the boss passes through the sealing hole and is provided in the groove.

[0015] In a possible implementation, the diameter of the sealing hole is the same as the diameter of the groove.

[0016] In a possible implementation, the groove is a circular groove, and the boss is cylindrical.

[0017] In a possible implementation, the diameter of the boss is smaller than the aperture of the groove; and / or

[0018] The height of the boss is smaller than the depth of the groove.

[0019] In one possible implementation, the aperture of the groove ranges from 55 μm to 210 μm; and / or

[0020] The depth of the grooves ranges from 250 μm to 550 μm; and / or

[0021] The diameter of the boss is in the range of 50 μm to 200 μm; and / or

[0022] The height of the bosses ranges from 200 μm to 500 μm.

[0023] In one possible implementation, the density of the grooves is in the range of 0.2 / cm 2 -0.3 pieces / cm 2 and / or

[0024] The density of bosses is 0.2 / cm 2 -0.3 pieces / cm 2 .

[0025] In a possible implementation, the bipolar battery further includes a first tab and a second tab, wherein the first tab is disposed on the negative electrode plate, and the second tab is disposed on the positive electrode plate.

[0026] In a possible implementation, the bipolar battery further includes a packaging component, which is coated on the outside of the stacked negative electrode plate, bipolar plate, and positive electrode plate.

[0027] In one possible implementation, the second electrode plate includes a second plate body, the second plate body is provided with a boss, and along the stacking direction of the bipolar plates, the thickness of the second plate body ranges from 50 μm to 100 μm; and / or

[0028] The thickness of the first electrode plate ranges from 300 μm to 600 μm.

[0029] In a possible implementation, the bipolar battery further includes a negative electrode active material layer and a positive electrode active material layer. The negative electrode active material layer is disposed on the inner wall of the groove, and the positive electrode active material layer is disposed on the outer surface of the boss.

[0030] In one possible implementation, the thickness of the positive electrode active material layer is in the range of 5 μm to 10 μm; and / or

[0031] The thickness of the negative electrode active material layer is in the range of 5 μm to 10 μm.

[0032] In a possible implementation, the thickness of the conductive connecting plate ranges from 10 μm to 20 μm.

[0033] In a possible implementation, the thickness of the sealing gasket ranges from 1 mm to 3 mm.

[0034] In a possible implementation, the bipolar battery is cylindrical, and along the height direction, the negative electrode plate, the positive electrode plate, the bipolar plate and the sealing gasket are circular.

[0035] In one possible implementation, the diameter of the bipolar battery is in the range of 5 cm to 10 cm.

[0036] In one possible implementation, the positive electrode plate is made of aluminum; and / or

[0037] The negative electrode plate is made of copper.

[0038] On the other hand, the present application provides a battery module, including a housing and the above-mentioned bipolar battery, wherein the bipolar battery is disposed in the housing.

[0039] In one possible implementation, the housing includes a carrier, a clamping member, and a fastener. The carrier is disposed below the bipolar battery, the clamping member is disposed above the bipolar battery, and the fastener connects the carrier and the clamping member to apply pressure to the bipolar battery.

[0040] On the other hand, the present application provides an electrical device, including an electrical device, the above-mentioned bipolar battery, or the above-mentioned battery module.

[0041] The bipolar battery, battery module and electrical equipment provided by the present application, by providing a groove on the first plate or the second plate of the bipolar plate, so that the electrolyte is provided in the groove, the scope of action of the electrolyte can be effectively controlled, and the electrolyte in the groove is difficult to penetrate and diffuse to the outside, and a sealing gasket is provided between the negative electrode plate, the bipolar plate and the positive electrode plate, so that the bipolar current collector can be sealed and insulated without using an adhesive sealing solution. Since the electrolyte is provided in the groove and does not contact the sealing gasket, the leakage problem that may occur during long-term use in the adhesive sealing solution can be avoided. In addition, the injection solution can directly inject the electrolyte into the groove, the injection process is simplified, and the process complexity is effectively reduced. Moreover, when the gas is generated by formation, it can also escape through the gap between the bipolar current collector layers, simplifying the process flow of formation and gas production. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. 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.

[0043] Figure 1 A schematic structural diagram of the negative electrode plate of a bipolar battery provided in an embodiment of the present application;

[0044] Figure 2 A schematic structural diagram of the positive electrode plate of a bipolar battery provided in an embodiment of the present application;

[0045] Figure 3 A schematic diagram of the structure of a bipolar battery before assembly provided in an embodiment of the present application;

[0046] Figure 4 A schematic diagram of the assembled bipolar battery provided in an embodiment of the present application;

[0047] Figure 5 for Figure 4 A schematic structural diagram of the bipolar battery after assembly from another perspective;

[0048] Figure 6 A schematic structural diagram of a bipolar battery provided in an embodiment of the present application;

[0049] Figure 7 for Figure 6 A schematic structural diagram of the bipolar battery from another perspective;

[0050] Figure 8 A schematic diagram of the structure of a battery module provided in an embodiment of the present application;

[0051] Figure 9 for Figure 8 A structural schematic diagram of the battery module from another perspective;

[0052] Figure 10 for Figure 8 Side view of the battery module shown.

[0053] Description of reference numerals:

[0054] 100-bipolar battery; 10-negative electrode plate; 11-first plate body; 12-groove; 13-negative electrode active material layer; 20-positive electrode plate; 21-second plate body; 22-boss; 23-positive electrode active material layer; 30-bipolar plate; 31-first electrode plate; 32-second electrode plate; 33-conductive connecting plate; 40-sealing gasket; 50-first electrode tab; 60-second electrode tab; 70-packaging component; 200-battery module; 201-housing; 202-carrying member; 203-clamping member; 204-fastener. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0056] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0057] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying 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 this application.

[0058] The terms "first", "second" and "third" (if any) in the description and claims of this application and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0059] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or display that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or display.

[0060] With the development of battery technology, batteries have been widely used in many fields. To increase the output voltage and energy density of batteries, bipolar battery technology can be used. By using bipolar plates with positive and negative electrodes, charging and discharging can be carried out simultaneously, thus shortening the current path and improving battery performance.

[0061] However, existing bipolar batteries typically use sealants for sealing. After a period of use, the adhesive joints are susceptible to electrolyte penetration, leading to seal failure and leakage. Furthermore, during formation venting, the edges of the original seal must be cut off and then heat-sealed after venting, increasing costs and operational complexity.

[0062] After repeated deliberation and verification, the inventors discovered that by providing honeycomb-shaped holes in the negative electrode current collector of a bipolar battery and injecting the electrolyte into the honeycomb holes, the electrolyte's range of action can be effectively controlled. The electrolyte within the honeycomb holes is difficult to penetrate and diffuse to the outside, thus eliminating the need for sealant and preventing leakage caused by electrolyte penetration. Furthermore, the electrolyte can be injected directly into the honeycomb holes, simplifying the injection process and improving production efficiency. This also facilitates the formation venting of the bipolar battery, facilitating subsequent processing and manufacturing.

[0063] In view of this, the present application provides a bipolar battery, comprising: a negative electrode plate; a positive electrode plate; at least one bipolar plate, the bipolar plate being stacked between the negative electrode plate and the positive electrode plate, the bipolar plate comprising a first electrode plate, a second electrode plate and a conductive connecting plate, the conductive connecting plate being connected between the first electrode plate and the second electrode plate in the same bipolar plate, the negative electrode plate being opposite to the second electrode plate of the adjacent bipolar plate, and the positive electrode plate being opposite to the first electrode plate of the adjacent bipolar plate; a groove being provided on the first electrode plate of the bipolar plate, a diaphragm being provided in the groove, a boss being provided on the second electrode plate of the bipolar plate, and the boss being accommodated in the adjacent groove; a sealing gasket being provided on both sides of the bipolar plate; and an electrolyte being provided in the groove.

[0064] By providing a groove on the first electrode plate of the bipolar plate and allowing the electrolyte to be located in the groove, the scope of action of the electrolyte can be effectively controlled. The electrolyte in the groove is difficult to penetrate and diffuse to the outside. In addition, a sealing gasket is provided between the negative electrode plate, the bipolar plate and the positive electrode plate. The bipolar current collector can be sealed and insulated without using an adhesive sealing solution. Since the electrolyte is provided in the groove and does not contact the sealing gasket, the leakage problem that may occur during long-term use in the adhesive sealing solution can be avoided. In addition, the injection solution can directly inject the electrolyte into the groove, simplifying the injection process and effectively reducing the complexity of the process. Moreover, during the formation and gas production, it can also escape through the gaps between the bipolar current collector layers, simplifying the process flow of the formation and gas production.

[0065] The contents of this application will be described in detail below with reference to the accompanying drawings so that those skilled in the art can understand the contents of this application more clearly and in detail.

[0066] Figure 1 A schematic structural diagram of the negative electrode plate of a bipolar battery provided in an embodiment of the present application. Figure 2 A schematic structural diagram of the positive electrode plate of a bipolar battery provided in an embodiment of the present application. Figure 3 This is a schematic diagram of the structure of the bipolar battery provided in an embodiment of the present application before assembly. Figure 4 This is a schematic diagram of the assembled structure of the bipolar battery provided in an embodiment of the present application. Figure 5 for Figure 4 Schematic diagram of the structure of the bipolar battery after assembly from another perspective. Figure 6 A schematic structural diagram of a bipolar battery provided in an embodiment of the present application. Figure 7 for Figure 6 A schematic structural diagram of the bipolar battery from another perspective is shown. Figure 8 A schematic structural diagram of the battery module provided in an embodiment of the present application. Figure 9 for Figure 8 A structural schematic diagram of the battery module from another perspective is shown. Figure 10 for Figure 8 Side view of the battery module shown.

[0067] like Figures 4 to 6 As shown, the bipolar battery 100 provided in an embodiment of the present application includes a negative electrode plate 10, a positive electrode plate 20, at least one bipolar plate 30, and a sealing gasket 40. The negative electrode plate 10, the bipolar plate 30, and the positive electrode plate 20 are stacked in order from bottom to top along the height direction. The sealing gasket 40 is provided between the negative electrode plate 10 and the bipolar plate 30, between adjacent bipolar plates 30, and between the bipolar plate 30 and the positive electrode plate 20.

[0068] like Figure 1As shown, the negative electrode plate 10 includes a first plate body 11. The first plate body 11 is provided with a groove 12. The groove 12 is used to accommodate electrolyte.

[0069] In a possible implementation, the groove 12 includes a plurality of grooves 12 , which are arranged on the first plate 11 at intervals.

[0070] In a possible implementation, the plurality of grooves 12 are arranged symmetrically, but the present invention is not limited thereto.

[0071] like Figure 3 As shown, in the bipolar battery 100 , the groove 12 is opened upward.

[0072] In a possible implementation, the thickness of the negative electrode plate 10 is in the range of 300 μm to 600 μm, that is, the thickness of the first plate body 11 is in the range of 300 μm to 600 μm.

[0073] In a possible implementation, the negative electrode plate 10 is made of copper.

[0074] like Figure 2 As shown, the positive electrode plate 20 includes a second plate body 21. A boss 22 is provided on the second plate body 21. The boss 22 is used to be accommodated in the groove 12 so as to be in contact with the electrolyte.

[0075] The arrangement of the boss 22 and the groove 12 increases the contact area between the negative electrode plate 10 and the positive electrode plate 20, improves the electrolyte wetting effect, accelerates the ion transmission rate, and significantly improves the battery charge and discharge rate performance.

[0076] In a possible implementation, the bosses 22 include a plurality of bosses 22 , which are spaced apart and arranged on the second plate 21 .

[0077] In a possible implementation, the bosses 22 are disposed in a one-to-one correspondence with the grooves 12 , so that each groove 12 accommodates a boss 22 .

[0078] In a possible implementation, the plurality of bosses 22 are arranged symmetrically, but the present invention is not limited thereto.

[0079] like Figure 3 As shown, in the bipolar battery 100 , the boss 22 is extended downward.

[0080] In a possible implementation, the thickness of the positive electrode plate 20 is in a range of 50 μm to 100 μm, that is, the thickness of the second plate body 21 is in a range of 50 μm to 100 μm.

[0081] In a possible implementation, the positive electrode plate 20 is made of aluminum.

[0082] like Figure 3As shown, the bipolar plate 30 is stacked between the negative electrode plate 10 and the positive electrode plate 20. The bipolar plate 30 includes a first electrode plate 31, a second electrode plate 32, and a conductive connecting plate 33. The first electrode plate 3 is the negative electrode plate 10, and the second electrode plate 32 is the positive electrode plate 20. The conductive connecting plate 33 connects the first electrode plate 31 and the second electrode plate 32.

[0083] Specifically, the conductive connecting plate 33 is connected between the first plate 11 of the first electrode plate 31 and the second plate 21 of the second electrode plate 32 in the same bipolar plate 30, thereby forming two sides with positive and negative poles. Furthermore, the groove 12 on the first electrode plate 31 and the boss 22 on the second electrode plate 32 in the same bipolar plate 30 are located on opposite sides of the bipolar plate 30.

[0084] Specifically, in the bipolar battery 100 , the groove 12 is located on the upper surface of the bipolar plate 30 , and the boss 22 is located on the lower surface of the bipolar plate 30 .

[0085] In a possible implementation, the thickness of the conductive connecting plate 33 ranges from 10 μm to 20 μm.

[0086] A sealing gasket 40 is provided between the side of the negative electrode plate 10 or bipolar plate 30 where the groove 12 is provided and the adjacent bipolar plate 30 or positive electrode plate 20. Specifically, the sealing gasket 40 is provided between the first plate 11 of the negative electrode plate 10 and the second plate 21 of the bipolar plate 30, between adjacent bipolar plates 30, and between the first plate 11 of the bipolar plate 30 and the second plate 21 of the positive electrode plate 20.

[0087] In one possible implementation, the bipolar plate 30 includes one sealing gasket 40 , which is only provided between the first plate 11 of the negative electrode plate 10 and the second plate 21 of the bipolar plate 30 , and between the first plate 11 of the bipolar plate 30 and the second plate 21 of the positive electrode plate 20 .

[0088] In a possible implementation, the bipolar plates 30 include at least two. The sealing gasket 40 is further provided between adjacent bipolar plates 30 , ie, between the first plate body 11 of the lower bipolar plate 30 and the second plate body 21 of the upper bipolar plate 30 .

[0089] In a possible implementation, the thickness of the sealing gasket 40 ranges from 1 mm to 3 mm.

[0090] like Figure 4 and Figure 5 As shown, the negative electrode plate 10 is opposite to the second electrode plate 32 of the adjacent bipolar plate 30, the positive electrode plate 20 is opposite to the first electrode plate 31 of the adjacent bipolar plate 30, and the boss 22 in the positive electrode plate 20 or the bipolar plate 30 is accommodated in the groove 12 in the adjacent bipolar plate 30 or the negative electrode plate 10.

[0091] When the negative electrode plate 10 , the bipolar plate 30 and the positive electrode plate 20 are stacked in sequence from bottom to top, the bosses 22 are accommodated in the adjacent grooves 12 .

[0092] In a possible implementation, the bipolar plate 30 includes one. The boss 22 on the positive electrode plate 20 is accommodated in the groove 12 of the bipolar plate 30 , and the boss 22 on the bipolar plate 30 is accommodated in the groove 12 of the negative electrode plate 10 .

[0093] In one possible implementation, the bipolar plates 30 include at least two. The bosses 22 on the positive plate 20 are accommodated in the grooves 12 of the adjacent bipolar plate 30 , and the bosses 22 on the bipolar plate 30 are accommodated in the grooves 12 of the adjacent bipolar plate 30 or the negative plate 10 .

[0094] The bipolar battery 100 further includes a separator and an electrolyte, both of which are disposed in the groove 12. The separator is used to prevent the positive electrode plate 20 from directly contacting the negative electrode plate 10.

[0095] In a possible implementation, the bipolar battery 100 is cylindrical, and along the height direction, the negative electrode plate 10 , the positive electrode plate 20 , the bipolar plate 30 and the sealing gasket 40 are circular.

[0096] However, the present invention is not limited thereto. In another possible implementation, the bipolar battery 100 may be in a cube shape, and along the height direction, the negative electrode plate 10 , the positive electrode plate 20 , the bipolar plate 30 and the sealing gasket 40 are in a square shape.

[0097] In one possible implementation, the diameter of the bipolar battery 100 ranges from 5 cm to 10 cm.

[0098] like Figure 3 As shown, in one possible implementation, the negative electrode plate 10 further includes a negative electrode active material layer 13. The positive electrode plate 20 further includes a positive electrode active material layer 23. The negative electrode active material layer 13 is disposed on the inner wall of the groove 12. The positive electrode active material layer 23 is disposed on the outer surface of the boss 22.

[0099] like Figure 4 As shown, when stacked, the negative electrode active material layer 13 in the groove 12 and the positive electrode active material layer 23 on the boss 22 are both infiltrated by the electrolyte, so that ions can migrate during the charge and discharge process.

[0100] In a possible implementation, the thickness of the negative electrode active material layer 13 is in the range of 5 μm to 10 μm, and the porosity is in the range of 15% to 30%.

[0101] In a possible implementation, the thickness of the positive electrode active material layer 23 is in a range of 5 μm to 10 μm, and the porosity is in a range of 20% to 40%.

[0102] In a possible implementation, a sealing hole is provided on the sealing gasket 40 , and the boss 22 passes through the sealing hole and is provided in the groove 12 .

[0103] The provision of the sealing hole facilitates further improving the sealing effect and preventing the electrolytes in the plurality of grooves 12 from flowing into each other.

[0104] In a possible implementation, the diameter of the sealing hole is the same as the diameter of the groove 12 .

[0105] The diameter of the sealing hole is the same as that of the groove 12 , which facilitates the passage of the boss 22 and the sealing of the groove 12 .

[0106] In a possible implementation, the groove 12 is a circular groove, and the boss 22 is cylindrical.

[0107] The circular groove 12 and the cylindrical boss 22 cooperate with each other to improve the uniformity of the current, thereby reducing the internal resistance.

[0108] In a possible implementation, the axes of the mutually fitting grooves 12 and the bosses 22 coincide with each other.

[0109] When the axes coincide, the gaps between the groove 12 and the boss 22 are consistent, which facilitates improving the uniformity of the current.

[0110] In a possible implementation, the diameter of the boss 22 is smaller than the aperture of the groove 12 .

[0111] This allows the electrolyte to remain in the groove 12 .

[0112] In a possible implementation, the height of the boss 22 is smaller than the depth of the groove 12 .

[0113] The height of the boss 22 is smaller than the depth of the groove 12 , so that the boss 22 can be completely accommodated in the groove 12 , thereby allowing the use of a sealing gasket 40 that is as thin as possible, thereby improving energy density.

[0114] In a possible implementation, the aperture of the groove 12 ranges from 55 μm to 210 μm.

[0115] In a possible implementation, the depth of the groove 12 ranges from 250 μm to 550 μm.

[0116] In a possible implementation, the diameter of the boss 22 ranges from 50 μm to 200 μm.

[0117] In a possible implementation, the height of the protrusion 22 ranges from 200 μm to 500 μm.

[0118] In a possible implementation, the arrangement density of the grooves 12 is in the range of 0.2 / cm 2 -0.3 pieces / cm 2 The arrangement density of the bosses 22 is 0.2 / cm 2 -0.3 pieces / cm 2 .

[0119] The arrangement density is the number of grooves 12 or bosses 22 per unit area in the plane where the grooves 12 or bosses 22 are located, that is, on the opposite surfaces of the negative electrode plate 10 , the positive electrode plate 20 or the bipolar plate 30 .

[0120] Since the grooves 12 and bosses 22 need to cooperate to achieve electrical contact between the electrodes, the arrangement density of the grooves 12 and bosses 22 should be as large as possible to increase the contact area. At the same time, since the grooves 12 and bosses 22 need to be processed and coated with active materials, too high an arrangement density can easily cause processing difficulties, active material adhesion, and affect yield. Therefore, the arrangement density of the grooves 12 and bosses 22 is in the range of 0.2 / cm 2 -0.3 pieces / cm 2 The arrangement density of the bosses 22 is 0.2 / cm 2 -0.3 pieces / cm 2 .

[0121] like Figure 6 and Figure 7 As shown, in a possible implementation, the bipolar battery 100 further includes a first tab 50 and a second tab 60. The first tab 50 is provided on the bottom negative electrode plate 10, and the second tab 60 is provided on the top positive electrode plate 20.

[0122] In a possible implementation, the bipolar battery 100 further includes a packaging member 70 , which is coated on the outside of the stacked negative electrode plate 10 , the bipolar plate 30 , and the positive electrode plate 20 .

[0123] The packaging member 70 is used to seal the assembled current collector, thereby completing the assembly of the bipolar battery 100 .

[0124] In a possible implementation, the packaging member 70 is made of an aluminum-plastic film.

[0125] The bipolar battery 100 provided in the embodiment of the present application includes: a negative electrode plate 10, the negative electrode plate 10 is provided with a groove 12, and a diaphragm is provided in the groove 12; a positive electrode plate 20, the positive electrode plate 20 is provided with a boss 22; at least one bipolar plate 30, the bipolar plate 30 is stacked between the negative electrode plate 10 and the positive electrode plate 20, and the bipolar plate 30 includes a first electrode plate 31, a second electrode plate 32 and a conductive connecting plate 33, and the conductive connecting plate 33 is connected to the first electrode plate 31 and the second electrode plate in the same bipolar plate 30. 32, and the groove 12 and the boss 22 in the same bipolar plate 30 are located on opposite sides of the bipolar plate 30, the negative electrode plate 10 is opposite to the second electrode plate 32 of the adjacent bipolar plate 30, the positive electrode plate 20 is opposite to the first electrode plate 31 of the adjacent bipolar plate 30, and the boss 22 in the positive electrode plate 20 or the bipolar plate 30 is accommodated in the groove 12 in the adjacent bipolar plate 30 or the negative electrode plate 10; the sealing gasket 40 is arranged on both sides of the bipolar plate 30; the electrolyte is arranged in the groove 12.

[0126] By providing a groove 12 on the negative electrode plate 10 and allowing the electrolyte to be located in the groove 12, the scope of action of the electrolyte can be effectively controlled. The electrolyte in the groove 12 is difficult to penetrate and diffuse to the outside. In addition, a sealing gasket 40 is provided between the negative electrode plate 10, the bipolar plate 30 and the positive electrode plate 20. The bipolar current collector can be sealed and insulated without using an adhesive sealing solution. Since the electrolyte is located in the groove 12 and does not contact the sealing gasket 40, the leakage problem that may occur during long-term use in the adhesive sealing solution can be avoided. In addition, the injection solution can directly inject the electrolyte into the groove 12, simplifying the injection process and effectively reducing the complexity of the process. Moreover, during the formation and gas production, it can also escape through the gaps between the bipolar current collector layers, simplifying the process flow of the formation and gas production.

[0127] In addition, if Figures 8 to 10 As shown, the embodiment of the present application further provides a battery module 200 , including a housing 201 and the above-mentioned bipolar battery 100 , wherein the bipolar battery 100 is disposed in the housing 201 .

[0128] The housing 201 is used to apply pressure to the bipolar battery 100 , thereby improving the sealing effect of the bipolar battery 100 .

[0129] In one possible implementation, the housing 201 includes a carrier 202, a clamping member 203, and a fastener 204. The carrier 202 is positioned below the bipolar battery 100, the clamping member 203 is positioned above the bipolar battery 100, and the fastener 204 connects the carrier 202 and the clamping member 203. The fastener 204 is used to tighten the carrier 202 and the clamping member 203, thereby applying pressure to the package 70 in the bipolar battery 100, causing the plates in the package 70 to squeeze against each other, thereby improving the sealing effect of the sealing gasket 40.

[0130] In one possible implementation, the fasteners 204 are a combination of nuts and bolts, making assembly and disassembly easier. Furthermore, the housing 201, formed by the fasteners 204, the carrier 202, and the clamping member 203, can adjust the external pressure applied to seal the encapsulated bipolar battery 100. Compared to adhesive sealing solutions, venting, maintenance, and replacement of the bipolar battery 100 can be performed more easily.

[0131] The specific structure, working principle and function of the bipolar battery 100 have been described in detail in the above embodiments and will not be repeated here. It should be noted that the preparation process of the battery module 200 is as follows:

[0132] Step 1: Prepare the negative electrode plate 10, the positive electrode plate 20, and the bipolar plate 30: Use corresponding molds to respectively prepare the negative electrode plate 10 and the positive electrode plate 20. Spray the positive electrode slurry on the boss 22 of the positive electrode plate 20 to form the positive electrode active material layer 23. Spray the negative electrode slurry into the groove 12 of the negative electrode plate 10 to form the negative electrode active material layer 13. Connect the negative electrode plate 10 and the positive electrode plate 20 via a conductive connecting plate 33 to form the bipolar plate 30.

[0133] The negative electrode plate 10 is 600 μm thick and 10 cm in diameter. The groove 12 has a diameter of 210 μm and a depth of 550 μm. The negative electrode active material layer 13 has a thickness of 10 μm and a porosity of 20%. The positive electrode plate 20 is 100 μm thick and 10 cm in diameter. The boss 22 has a diameter of 200 μm and a height of 500 μm. The positive electrode active material layer 23 has a thickness of 10 μm and a porosity of 25%. The conductive connecting plate 33 is 20 μm thick.

[0134] The bosses 22 on the positive electrode plate 20 and the grooves 12 on the negative electrode plate 10 are arranged in a hexagonal pattern on the corresponding plates, with an arrangement density of 0.3 / cm 2 .

[0135] Step 2: Assemble the bipolar battery: Lay a diaphragm in the grooves 12 of the negative electrode plate 10 and the bipolar plate 30, then inject 2 mL of electrolyte into them. Stack the injected negative electrode plate 10 and several bipolar plates 30 from bottom to top, with the positive electrode plate 20 stacked on the top. Set a sealing gasket 40 between the first plate 11 of the negative electrode plate 10 and the second plate 21 of the bipolar plate 30, between adjacent bipolar plates 30, and between the first plate 11 of the bipolar plate 30 and the second plate 21 of the positive electrode plate 20. The sealing gasket 40 has a diameter of 10 cm and a thickness of 1 mm to form a bipolar battery 100.

[0136] Step 3: Vacuuming: Place the assembled bipolar battery 100 in a vacuum environment, and set the vacuum degree to -0.6 MPa to -0.8 MPa, preferably -0.6 MPa.

[0137] Step 4: Formation and exhaust: The assembled bipolar battery 100 is formed, and the gas generated by the formation escapes through the gaps between the layers of the bipolar battery 100.

[0138] Step 5: Initially apply pressure: slowly apply pressure to both ends of the bipolar battery 100, with the pressure range of 1 to 10N.

[0139] Step 6: Sealing the battery: Under the pressure of step 5, the bipolar battery 100 is externally packaged, and at the same time, the second tab 60 and the first tab 50 are led out from the surface of the positive electrode plate 20 and the negative electrode plate 10 on both sides by welding, bonding, etc.

[0140] Step 7: Apply external pressure to assemble the battery module 200: Take the bipolar battery 100 out of the vacuum environment, and apply pressure to the bipolar battery 100 through the housing 201, with the pressure range of 5 to 20N.

[0141] The present application also provides an electrical device, comprising an electrical device and the bipolar battery 100 described in any of the above embodiments, or the battery module 200 described above. The bipolar battery 100 or the battery module 200 is used to provide electrical energy to the electrical device.

[0142] The electrical equipment in the embodiments of the present application may be a vehicle. For example, the vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. Accordingly, the electrical device may be the vehicle's drive mechanism or the vehicle's control system.

[0143] In addition, the electrical equipment may also be other energy storage devices, such as mobile phones, portable devices, laptop computers, electric toys, electric tools, ships and spacecraft, etc., among which the spacecraft may include airplanes, rockets, space shuttles or spacecraft.

[0144] Since the electrical device in this embodiment includes the bipolar battery 100 or battery module 200 described in any of the above embodiments, the structure and beneficial effects of the electrical device including the bipolar battery 100 or battery module 200 will not be further described in this embodiment.

[0145] 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 battery, characterized in that: include: A negative electrode plate (10); A positive electrode plate (20); At least one bipolar plate (30), the bipolar plate (30) being stacked between the negative electrode plate (10) and the positive electrode plate (20), the bipolar plate (30) comprising a first electrode plate (31), a second electrode plate (32) and a conductive connecting plate (33), the conductive connecting plate (33) being connected between the first electrode plate (31) and the second electrode plate (32) in the same bipolar plate (30), the negative electrode plate (10) being opposite to the second electrode plate (32) of the adjacent bipolar plate (30), and the positive electrode plate (20) being opposite to the first electrode plate (31) of the adjacent bipolar plate (30); A groove (12) is provided on the first electrode plate (31) or the second electrode plate (32) of the bipolar plate (30), a diaphragm is provided in the groove (12), and a boss (22) is provided on the other of the first electrode plate (31) and the second electrode plate (32) of the bipolar plate (30), the boss (22) being accommodated in the adjacent groove (12); Sealing gaskets (40), the sealing gaskets (40) being arranged on both sides of the bipolar plate (30); An electrolyte is disposed in the groove (12).

2. The bipolar battery according to claim 1, wherein: The negative electrode plate (10) is provided with the groove (12), the diaphragm is provided in the groove (12), and the boss (22) of the bipolar plate (30) is accommodated in the groove (12) of the adjacent negative electrode plate (10); and / or The positive electrode plate (20) is provided with the boss (22), and the boss (22) of the positive electrode plate (20) is accommodated in the groove (12) of the adjacent bipolar plate (30).

3. The bipolar battery according to claim 1, wherein: The sealing gasket (40) is provided with a sealing hole, and the boss (22) passes through the sealing hole and is arranged in the groove (12).

4. The bipolar battery according to claim 3, wherein: The aperture of the sealing hole is the same as the aperture of the groove (12).

5. The bipolar battery according to claim 1, wherein: The groove (12) is a circular groove, and the boss (22) is cylindrical.

6. The bipolar battery according to claim 5, wherein: The diameter of the boss (22) is smaller than the aperture of the groove (12); and / or The height of the boss (22) is smaller than the depth of the groove (12).

7. The bipolar battery according to claim 6, wherein: The pore size of the groove (12) ranges from 55 μm to 210 μm; and / or The depth of the groove (12) ranges from 250 μm to 550 μm; and / or The diameter of the boss (22) ranges from 50 μm to 200 μm; and / or The height of the boss (22) ranges from 200 μm to 500 μm.

8. The bipolar battery according to claim 1, wherein: The arrangement density of the grooves (12) is in the range of 0.2 / cm 2 -0.3 pieces / cm 2 and / or The arrangement density of the bosses (22) is in the range of 0.2 / cm 2 -0.3 pieces / cm 2 .

9. The bipolar battery according to claim 1, wherein: The bipolar battery (100) further comprises a first pole tab (50) and a second pole tab (60), wherein the first pole tab (50) is provided on the negative electrode plate (10), and the second pole tab (60) is provided on the positive electrode plate (20).

10. The bipolar battery according to claim 1, wherein: The bipolar battery (100) further includes a packaging member (70), wherein the packaging member (70) is coated on the outside of the stacked negative electrode plate (10), the bipolar plate (30), and the positive electrode plate (20).

11. The bipolar battery according to claim 1, wherein: The second electrode plate (32) comprises a second plate body (21), the boss (22) is provided on the second plate body (21), and the thickness of the second plate body (21) along the stacking direction of the bipolar plate (30) is in the range of 50 μm to 100 μm; and / or The thickness of the first electrode plate (31) ranges from 300 μm to 600 μm.

12. The bipolar battery according to claim 1, wherein: The bipolar battery (100) further comprises a negative electrode active material layer (13) and a positive electrode active material layer (23), wherein the negative electrode active material layer (13) is arranged on the inner wall of the groove (12), and the positive electrode active material layer (23) is arranged on the outer surface of the boss (22).

13. The bipolar battery according to claim 12, wherein: The thickness of the positive electrode active material layer (23) is in the range of 5 μm to 10 μm; and / or The thickness of the negative electrode active material layer (13) is in the range of 5 μm to 10 μm.

14. The bipolar battery according to claim 1, wherein: The thickness of the conductive connecting plate (33) ranges from 10 μm to 20 μm.

15. The bipolar battery according to claim 1, wherein The thickness of the sealing gasket (40) ranges from 1 mm to 3 mm.

16. The bipolar battery according to claim 1, wherein: The bipolar battery (100) is cylindrical, and along the height direction, the negative electrode plate (10), the positive electrode plate (20), the bipolar plate (30) and the sealing gasket (40) are circular.

17. The bipolar battery according to claim 15, wherein: The diameter of the bipolar battery (100) ranges from 5 cm to 10 cm.

18. The bipolar battery according to claim 1, wherein The material of the positive electrode plate (20) is aluminum; and / or The negative electrode plate (10) is made of copper.

19. A battery module, characterized in that: The invention comprises a housing (201) and a bipolar battery (100) according to any one of claims 1 to 18, wherein the bipolar battery (100) is arranged in the housing (201).

20. The battery module according to claim 19, wherein: The housing (201) includes a carrier (202), a clamping member (203) and a fastener (204); the carrier (202) is arranged below the bipolar battery (100); the clamping member (203) is arranged above the bipolar battery (100); and the fastener (204) connects the carrier (202) and the clamping member (203) to apply pressure to the bipolar battery (100).

21. An electrical device, characterized in that: It comprises an electrical device, a bipolar battery (100) as described in any one of claims 1 to 18, or a battery module (200) as described in any one of claims 19 to 20.

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