Diaphragm-free naked battery cell, naked battery cell unit, battery, battery module and electric equipment

Abstract

The utility model belongs to the technical field of lithium batteries, and discloses a diaphragm-free naked battery cell, a naked battery cell unit, a battery, a battery module and electric equipment, the diaphragm-free naked battery cell comprises a plurality of first electrode plates and a plurality of second electrode plates which are stacked, the first electrode plates and the second electrode plates are alternately stacked, the first layer is the first electrode plates, the second layer is the second electrode plates, and the third layer is the second electrode plates. The last layer is the second electrode plate; a solid electrolyte layer is arranged between the adjacent first electrode plate and second electrode plate; and from the first layer to the last layer, the second tabs of the second electrode plates in the even number layers are electrically connected with the first tabs of the first electrode plates in the adjacent odd number layers behind the second electrode plates, and the voltage of the naked battery cell can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of secondary batteries, and specifically relates to a bare cell without a diaphragm, a bare cell unit, a battery, a battery module and electrical equipment. Background Art

[0002] As an important secondary battery, lithium-ion battery has the advantages of light weight, high energy density, long cycle life and high safety performance, and has become the mainstream battery.

[0003] Traditional lithium-ion batteries require a PE or PP separator between the positive and negative electrodes. The separator has poor thermal stability and is prone to shrinkage at high temperatures, causing short circuits in the battery. It is also not resistant to lithium dendrite puncture. Due to the poor safety of traditional lithium-ion batteries and the fixed winding or stacking method, the voltage of the bare cell is low. The voltage of the battery module can only be increased by connecting single cells in series, but it is impossible to directly obtain a bare cell with a higher voltage level. Utility Model Content

[0004] The utility model provides a bare cell without a diaphragm, a bare cell unit, a battery, a battery module and electrical equipment, which are at least used for increasing the voltage of the bare cell.

[0005] In a first aspect, the utility model provides a bare cell without a diaphragm, comprising a plurality of first electrode sheets and a plurality of second electrode sheets stacked in layers, wherein the first electrode sheets and the second electrode sheets are alternately stacked, and the first layer is the first electrode sheet, and the last layer is the second electrode sheet;

[0006] A solid electrolyte layer is disposed between the adjacent first electrode sheet and the second electrode sheet;

[0007] From the first layer to the last layer, the second electrode tabs of each of the second electrode sheets in the even-numbered layers are electrically connected to the first electrode tabs of the first electrode sheets in the subsequent adjacent odd-numbered layers.

[0008] As an implementable manner, the first electrode sheet includes a first substrate and the first electrode tab located at one side of the first substrate, and the second electrode sheet includes a second substrate and the second electrode tab located at one side of the second substrate;

[0009] In the orthographic projection in the stacking direction, one of the first substrate and the second substrate is located within the other pair of boundaries.

[0010] As an implementation manner, the first electrode tab and the second electrode tab which are electrically connected to each other are connected by welding.

[0011] As an implementable manner, the first pole lug and the second pole lug that are electrically connected to each other are insulated from the rest of the first pole lug and the second pole lug.

[0012] As an implementation manner, an insulating layer is disposed outside the first electrode tab and the second electrode tab that are electrically connected to each other.

[0013] As an achievable manner, the insulating layer surrounds the outer sides of the first pole lug and the second pole lug; or,

[0014] The insulating layer includes a first insulating layer and a second insulating layer. The first insulating layer is arranged on a side of the first pole tab away from the second pole tab, and the second insulating layer is arranged on a side of the second pole tab away from the first pole tab.

[0015] As an implementation manner, in the orthographic projection in the stacking direction, one of the first pole lug and the second pole lug electrically connected to each other is located within the other pair of boundaries; or at least part of their boundaries overlap.

[0016] As an implementable manner, the first substrate and the second substrate are both square, and the distances from each side of the first substrate to the corresponding side of the second substrate are the same.

[0017] As an achievable manner, the first electrode tab of the first electrode sheet of the first layer and the second electrode tab of the second electrode sheet of the last layer are located on the same side or different sides of the bare cell without diaphragm; or,

[0018] The first electrode tab of each of the first electrode sheets and the second electrode tab of each of the second electrode sheets are both located on the same side of the bare cell without diaphragm;

[0019] The first pole lug of the first electrode sheet of the first layer and the second pole lug of the second electrode sheet of the last layer are located on different sides of the bare cell without diaphragm from the first pole lugs of the remaining first electrode sheets and the second pole lugs of the remaining second electrode sheets, and the first pole lugs of the remaining first electrode sheets and the second pole lugs of the remaining second electrode sheets are located on the same side of the bare cell without diaphragm.

[0020] In a second aspect, the utility model provides a membrane-less bare cell unit, comprising at least two of the above-mentioned membrane-less bare cells, wherein the membrane-less bare cells are stacked and connected in parallel with each other.

[0021] As an achievable manner, in two adjacent bare cells without diaphragm, the first pole lug and the second pole lug electrically connected to each other in one of the bare cells without diaphragm, and the first pole lug and the second pole lug electrically connected to each other in the other bare cell without diaphragm, are located on different sides of the bare cell unit without diaphragm.

[0022] In a third aspect, the utility model provides a diaphragm-free battery, including the above-mentioned diaphragm-free bare cell, or the above-mentioned diaphragm-free bare cell unit.

[0023] In a fourth aspect, the utility model provides a diaphragm-less battery module, comprising a plurality of the above-mentioned diaphragm-less batteries, wherein the plurality of the diaphragm-less batteries are connected in series and / or in parallel.

[0024] In a fifth aspect, the utility model provides an electrical device, including the above-mentioned diaphragm-free battery; or, including the above-mentioned diaphragm-free battery module.

[0025] The above scheme realizes the series connection of single-chip battery cells by electrically connecting the second electrode sheets of each of the second electrode sheets located in the even-numbered layers with the first electrode sheets of the first electrode sheets of the adjacent odd-numbered layers thereafter. According to the number of the first electrode sheets and the second electrode sheets provided, the bare battery cells can obtain a higher voltage. Among them, the single-chip battery cell may refer to a battery cell composed of a first electrode sheet and a second electrode sheet and a solid electrolyte layer therebetween.

[0026] In addition, by setting a solid electrolyte layer between the adjacent first electrode sheet and the second electrode sheet, compared with the traditional solution of setting a PE or PP diaphragm between the first electrode sheet and the second electrode sheet, this solution has extremely high thermal stability, and can effectively inhibit the growth of lithium dendrites during the reversible charge and discharge process, greatly improving the safety of the battery. In addition, it is precisely because a solid electrolyte layer is set between the adjacent first electrode sheet and the second electrode sheet, because the solid electrolyte has high safety, and the edge of the single-chip battery cell can be encapsulated with a sealant, so that the solid electrolyte cannot leak out everywhere, and there is no need to consider the introduction position of the diaphragm in the battery cell design, so as to realize the single-chip battery cell series connection, so that the voltage of the bare battery cell without a diaphragm composed of multiple single-chip batteries in series is much higher than the voltage of the bare battery cell of the traditional lithium battery, and the bare battery cell without a diaphragm using this solution can reduce the use of unnecessary structural parts, thereby improving the energy density of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0028] Figure 1 A front view of a bare cell without a diaphragm provided in an embodiment of the utility model;

[0029] Figure 2 for Figure 1 Right view of;

[0030] Figure 3 for Figure 1 A top view of

[0031] Figure 4 A front view of a first electrode sheet provided in an embodiment of the utility model;

[0032] Figure 5 for Figure 4 Right view of;

[0033] Figure 6 A front view of a first electrode sheet provided in another embodiment of the utility model;

[0034] Figure 7 A right side view of a first electrode sheet provided in another embodiment of the utility model;

[0035] Figure 8 A front view of a bare cell without a diaphragm provided in another embodiment of the utility model;

[0036] Fig. 9 A front view of a bare cell without a diaphragm provided in another embodiment of the utility model;

[0037] Fig.10 A front view of a bare cell without a diaphragm provided in another embodiment of the utility model;

[0038] Fig.11 A front view of a bare cell without a diaphragm provided in another embodiment of the utility model;

[0039] Fig.12 A front view of a bare cell without a diaphragm provided in another embodiment of the utility model.

[0040] Description of reference numerals:

[0041] First electrode sheet 1 , first substrate 11 , current collectors 111 , 222 , positive electrode material layer 112 , first electrode tab 12 , second electrode sheet 2 , second electrode tab 21 , second substrate 22 , negative electrode material layer 221 , solid electrolyte layer 3 , insulating layer 4 . DETAILED DESCRIPTION

[0042] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0045] like Figure 1-Figure 5 As shown, an embodiment of the utility model provides a bare cell without a diaphragm, comprising a plurality of first electrode sheets 1 and a plurality of second electrode sheets 2 stacked in layers, wherein the first electrode sheets 1 and the second electrode sheets 2 are alternately stacked, and the first layer is the first electrode sheet 1 and the last layer is the second electrode sheet 2.

[0046] Among them, one of the first electrode sheet 1 and the second electrode sheet 2 is a positive electrode sheet and the other is a negative electrode sheet. The positive electrode sheet has a positive electrode material layer 112, and the negative electrode sheet has a negative electrode material layer 221. Generally, the corresponding positive electrode sheet or negative electrode sheet can be formed by coating the negative electrode material or the positive electrode material on a metal foil, such as a copper foil, and drying or cutting.

[0047] In this example, the structures of all first electrode sheets 1 may be the same, and the structures of all second electrode sheets 2 may also be the same, and they all include a current collector and an electrode material layer disposed on both sides of the current collector, at least as follows: Figure 2 , Figure 5 As shown, the first electrode sheet 1 is a positive electrode sheet, and positive electrode material layers 112 are respectively arranged on both sides of the current collector 111 of the first electrode sheet 1, and the second electrode sheet 2 is a negative electrode sheet, and negative electrode material layers 221 are respectively arranged on both sides of the current collector 222 of the second electrode sheet 2; the above-mentioned current collectors are formed by cutting the above-mentioned metal foil, generally by coating the corresponding electrode material on the metal foil and drying it before cutting, and the current collector has a part where the electrode material is not arranged as a pole ear.

[0048] As another implementation, the structure of the first electrode sheet 1 located at the outermost layer may be different from the structure of the remaining first electrode sheets 1, and the structure of the second electrode sheet 2 located at the outermost layer may be different from the structure of the remaining second electrode sheets 2. The different structures mentioned here may include but are not limited to the different positions of the electrode material layer and / or the positions of the tabs.

[0049] For example, Figure 7As shown, the first electrode sheet 1 located in the outermost layer is provided with an electrode material layer only on one side close to the second electrode sheet 2. When the first electrode sheet 1 is a positive electrode sheet, the electrode material layer is the positive electrode material layer 112, and electrode material layers are respectively provided on both sides of the remaining first electrode sheets 1; the second electrode sheet 2 located in the outermost layer is provided with an electrode material layer only on one side close to the first electrode sheet 1, and electrode material layers are respectively provided on both sides of the remaining second electrode sheets 2.

[0050] For example, at least Figure 6 As shown, the first electrode sheet 1 located at the outermost layer is provided with an electrode material layer only on one side close to the second electrode sheet 2, while the electrode material layers are provided on both sides of the remaining first electrode sheets 1, and the first electrode tab 12 of the first electrode sheet 1 located at the outermost layer passes through the center line of the current collector, as shown in FIG. Figure 4 As shown, the first pole tabs 12 of the remaining first electrode sheets 1 deviate from one side of the centerline of the current collector; the second electrode sheet 2 located in the outermost layer is provided with an electrode material layer only on one side close to the first electrode sheet 1, while the electrode material layers are respectively provided on both sides of the remaining second electrode sheets 2, the second pole tabs 21 of the second electrode sheet 2 located in the outermost layer passes through the centerline of the current collector, and the second pole tabs 21 of the remaining second electrode sheets 2 deviate from one side of the centerline of the current collector.

[0051] Of course, in other examples, corresponding electrode material layers may be respectively arranged on both sides of all first electrode sheets 1 and all second electrode sheets 2, with only the first electrode tab 12 of the outermost first electrode sheet 1 and the first electrode tabs 12 of the remaining first electrode sheets 1 being arranged at different positions on the current collector, and the second electrode tab 21 of the outermost second electrode sheet 2 and the second electrode tabs 21 of the remaining second electrode sheets 2 being arranged at different positions on the current collector.

[0052] The location of the first pole tab 12 of the outermost first electrode sheet 1 and the location of the second pole tab 21 of the outermost second electrode sheet 2 are mainly considered to facilitate the connection of the bare cell without diaphragm with other external components.

[0053] A solid electrolyte layer 3 is disposed between the adjacent first electrode sheet 1 and the second electrode sheet 2 .

[0054] By providing a solid electrolyte layer 3 between adjacent first electrode sheets 1 and second electrode sheets 2, the need for a diaphragm can be eliminated, thereby improving thermal stability, effectively inhibiting the growth of lithium dendrites during reversible charge and discharge, and greatly improving battery safety.

[0055] Among them, the solid electrolyte layer 3 can be pre-prepared on the first electrode sheet 1 or the second electrode sheet 2 to form a composite electrode sheet, and the composite electrode sheet can be directly stacked alternately with the first electrode sheet 1 or the second electrode sheet 2 without the solid electrolyte layer 3, which can improve processing efficiency.

[0056] The material of the solid electrolyte layer 3 can be an inorganic solid electrolyte or a polymer solid electrolyte, or a composite solid electrolyte including the above two.

[0057] From the first layer to the last layer, the second pole tabs 21 of each of the second electrode sheets 2 in the even-numbered layers are electrically connected to the first pole tabs 12 of the first electrode sheets 1 in the odd-numbered layers adjacent thereto. With this connection method, it is equivalent to that starting from the first layer, a first electrode sheet 1 and a second electrode sheet 2 and the solid electrolyte layer 3 therebetween constitute a single-chip battery cell. Since the first electrode sheets 1 and the second electrode sheets 2 are alternately stacked, and the first layer is the first electrode sheet 1 and the last layer is the second electrode sheet 2, the number of the first electrode sheets 1 is the same as the number of the second electrode sheets 2, both of which are n, and n is greater than or equal to 2, and thus n single-chip batteries are correspondingly constituted.

[0058] In addition, since the second pole ears 21 of each of the second electrode sheets 2 located in the even-numbered layers are respectively electrically connected to the first pole ears 12 of the first electrode sheets 1 in the adjacent odd-numbered layers thereafter, the series connection of the monolithic battery cells is realized, and the output voltage of the bare battery cell without a diaphragm is n times the output voltage of the monolithic battery cell. For example, the output voltage of a single monolithic battery cell is 1V, the output voltage of two monolithic battery cells connected in series is 2V, and the output voltage of three monolithic battery cells connected in series is 3V. According to the same rule, the number of monolithic battery cells connected in series can be flexibly selected according to the required voltage to obtain a bare battery cell without a diaphragm with a corresponding voltage output.

[0059] After the bare cells without diaphragms are stacked, insulating tape or other insulating materials can be placed around them to protect the edges of each electrode sheet to prevent the adverse effects of burrs.

[0060] The above scheme realizes the series connection of single-chip battery cells by electrically connecting the second pole ears 21 of each of the second electrode sheets 2 located in the even-numbered layers with the first pole ears 12 of the first electrode sheets 1 located in the adjacent odd-numbered layers thereafter. According to the number of the first electrode sheets 1 and the second electrode sheets 2 provided, the bare battery cells can obtain a higher voltage. Among them, the single-chip battery cell may refer to a battery cell composed of a first electrode sheet 1 and a second electrode sheet 2 and a solid electrolyte layer 3 therebetween.

[0061] In addition, by setting a solid electrolyte layer 3 between the adjacent first electrode sheet 1 and the second electrode sheet 2, compared with the traditional solution of setting a PE or PP diaphragm between the first electrode sheet 1 and the second electrode sheet 2, this solution has extremely high thermal stability, and can effectively inhibit the growth of lithium dendrites during the reversible charge and discharge process, greatly improving the safety of the battery. In addition, it is precisely because the solid electrolyte layer 3 is set between the adjacent first electrode sheet 1 and the second electrode sheet 2, because the solid electrolyte has high safety, and the edge of the single-chip battery cell can be encapsulated with a sealant, so that the solid electrolyte cannot leak out everywhere, and there is no need to consider the introduction position of the diaphragm in the battery cell design, so as to realize the single-chip battery cell series connection, so that the voltage of the bare battery cell without a diaphragm composed of multiple single-chip batteries in series is much higher than the voltage of the bare battery cell of the traditional lithium battery, and the bare battery cell without a diaphragm using this solution can reduce the use of unnecessary structural parts, thereby improving the energy density of the battery cell.

[0062] As an implementable manner, the first electrode sheet 1 includes a first substrate 11 and the first electrode tab 12 located at one side of the first substrate 11 , and the second electrode sheet 2 includes a second substrate 22 and the second electrode tab 21 located at one side of the second substrate 22 .

[0063] The first substrate 11 and the second substrate 22 both include the above-mentioned current collector and an electrode material layer correspondingly arranged on the current collector.

[0064] In the orthographic projection in the stacking direction, one of the first substrate 11 and the second substrate 22 is located within the other pair of boundaries.

[0065] For example, if the first electrode sheet 1 is a positive electrode sheet and the second electrode sheet 2 is a negative electrode sheet, the second substrate 22 is larger than the first substrate 11, that is, the first substrate 11 is located within the boundary range of the second substrate 22. In other words, the substrate of the negative electrode sheet is generally larger than the substrate of the positive electrode sheet, and the substrate of the positive electrode sheet is located within the boundary range of the substrate of the negative electrode sheet.

[0066] As an implementable manner, the first pole tab 12 and the second pole tab 21 which are electrically connected to each other are welded.

[0067] The welding referred to in this article may be performed by laser welding, ultrasonic welding, resistance welding, electromagnetic welding, friction welding, electric resistance welding, etc.

[0068] As an implementable manner, the first pole lug 12 and the second pole lug 21 that are electrically connected to each other are insulated from the remaining first pole lugs 12 and the second pole lugs 21 to prevent electrical defects such as short circuits.

[0069] As an implementable manner, the first pole lug 12 and the second pole lug 21 that are electrically connected to each other are provided with an insulating layer 4 outside, so that the first pole lug 12 and the second pole lug 21 that are electrically connected to each other are insulated from the rest of the first pole lug 12 and the second pole lug 21 .

[0070] As an implementable manner, the insulating layer 4 surrounds the outer sides of the first pole lug 12 and the second pole lug 21; for example, an insulating tape may be wrapped around the outer sides of the first pole lug 12 and the second pole lug 21 that are electrically connected to each other, or a flexible insulating sleeve may be put on the outer sides of the first pole lug 12 and the second pole lug 21 that are electrically connected to each other.

[0071] Insulating members may also be provided on opposite sides of the first pole lug 12 and the second pole lug 21 which are electrically connected to each other. For example, the insulating layer 4 includes a first insulating layer and a second insulating layer, and the first insulating layer and the second insulating layer serve as insulating members respectively. The first insulating layer is provided on the side of the first pole lug 12 away from the second pole lug 21, and the second insulating layer is provided on the side of the second pole lug 21 away from the first pole lug 12.

[0072] As an implementable manner, in order to facilitate the provision of an insulating layer 4 outside the first pole lug 12 and the second pole lug 21 that are electrically connected to each other, in the orthographic projection in the stacking direction, the first pole lug 12 and the second pole lug 21 that are electrically connected to each other, one of them is located within the range of another pair of boundaries; or, at least part of their boundaries overlap.

[0073] in, Figure 1 In the example shown, the right side lines of the first pole tab 12 and the second pole tab 21 electrically connected to each other overlap, and the upper and lower side lines overlap beyond the second substrate 22 .

[0074] As an achievable method, the first substrate 11 and the second substrate 22 are both square, and the distances from each side of the first substrate 11 to the corresponding sides of the second substrate 22 are the same; with this structure, the electrode material layer in the first substrate 11 and the electrode material layer in the second substrate 22 can have a maximum overlapping area, which is beneficial to increasing the capacity of the bare cell without a diaphragm.

[0075] The sizes of the first substrate 11 and the second substrate 22 can be determined according to actual conditions. For example, but not limited to, the side lengths of the first substrate 11 and the second substrate 22 can be 1 cm-100 cm.

[0076] As an achievable method, Figure 8 As shown, the first electrode tab 12 of the first electrode sheet 1 of the first layer and the second electrode tab 21 of the second electrode sheet 2 of the last layer are located on the same side of the bare cell without a diaphragm.

[0077] As another implementation, Fig. 9 , Fig.10 , Fig.11 As shown, the first electrode tab 12 of the first electrode sheet 1 of the first layer and the second electrode tab 21 of the second electrode sheet 2 of the last layer are located on different sides of the bare cell without a diaphragm.

[0078] As another implementation, Fig.12 As shown, the first pole tab 12 of each first electrode sheet 1 and the second pole tab 21 of each second electrode sheet 2 are located on the same side of the bare cell without diaphragm. With this solution, only one structural form of first electrode sheet 1 and second electrode sheet 2 needs to be prepared.

[0079] As another implementation, Figure 1 , Fig. 9 , Fig.10 , Fig.11 As shown, the first pole ear 12 of the first electrode sheet 1 of the first layer and the second pole ear 21 of the second electrode sheet 2 of the last layer are located on different sides of the bare cell without diaphragm from the first pole ear 12 of the remaining first electrode sheets 1 and the second pole ears 21 of the remaining second electrode sheets 2, and the first pole ears 12 of the remaining first electrode sheets 1 and the second pole ears 21 of the remaining second electrode sheets 2 are located on the same side of the bare cell without diaphragm.

[0080] In a second aspect, the utility model provides a membrane-less bare cell unit, comprising at least two of the above-mentioned membrane-less bare cells, wherein the membrane-less bare cells are stacked and connected in parallel with each other.

[0081] By setting different numbers of bare cells without diaphragms and connecting them in parallel, bare cell units with corresponding electric capacity can be obtained.

[0082] For example, but not limited to, you can use Figure 1 , Fig.11 The bare cells without diaphragms are shown to be stacked alternately. After stacking, the first pole ears 12 of the first first electrode sheets 1 of two adjacent bare cells without diaphragms overlap in the orthographic projection of the bare cells without diaphragms. The two first pole ears 12 can be directly welded, and correspondingly, the second pole ears 12 of the last two adjacent second electrode sheets 2 can be directly welded.

[0083] This solution can connect bare cells without diaphragms in parallel without external components, which can increase the energy of the battery and reduce the internal resistance of the battery. In addition, through the series connection of bare cells without diaphragms and the parallel connection between bare cells without diaphragms, the prepared battery not only saves packaging resources, but also makes more efficient use of space resources, thereby improving the energy density of the battery. In addition, the active areas of all the electrode sheets of the battery (the area where the electrode material is set) are on the same vertical plane, which improves the structural stability of the battery.

[0084] As an achievable manner, in two adjacent bare cells without diaphragm, the first pole lug 12 and the second pole lug 21 electrically connected to each other in one of the bare cells without diaphragm, and the first pole lug 12 and the second pole lug 21 electrically connected to each other in the other bare cell without diaphragm, are located on different sides of the bare cell unit without diaphragm.

[0085] In a third aspect, the utility model provides a diaphragm-free battery, including the above-mentioned diaphragm-free bare cell, or the above-mentioned diaphragm-free bare cell unit.

[0086] In a fourth aspect, the utility model provides a diaphragm-less battery module, comprising a plurality of the above-mentioned diaphragm-less batteries, wherein the plurality of the diaphragm-less batteries are connected in series and / or in parallel.

[0087] The number of diaphragmless batteries to be used and their series-parallel relationship can be determined based on the output voltage and capacity of the diaphragmless battery module.

[0088] In a fifth aspect, the utility model provides an electrical device, including the above-mentioned diaphragm-free battery; or, including the above-mentioned diaphragm-free battery module.

[0089] Electrical equipment includes, but is not limited to, new energy vehicles (electric vehicles, hybrid vehicles, etc.), digital products, etc.

[0090] It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used above to indicate positions or positional relationships are based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0091] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other.

Claims

1. A bare cell without a diaphragm, characterized in that: It comprises a plurality of first electrode sheets (1) and a plurality of second electrode sheets (2) which are stacked, wherein the first electrode sheets (1) and the second electrode sheets (2) are alternately stacked, and the first layer is the first electrode sheet (1) and the last layer is the second electrode sheet (2); A solid electrolyte layer (3) is arranged between the adjacent first electrode sheet (1) and the second electrode sheet (2); From the first layer to the last layer, the second electrode tabs (21) of each of the second electrode sheets (2) in the even-numbered layers are respectively electrically connected to the first electrode tabs (12) of the first electrode sheets (1) in the subsequent adjacent odd-numbered layers.

2. The membrane-free bare cell according to claim 1, characterized in that: The first electrode sheet (1) comprises a first substrate (11) and the first electrode tab (12) located on one side of the first substrate (11); the second electrode sheet (2) comprises a second substrate (22) and the second electrode tab (21) located on one side of the second substrate (22); In the orthographic projection in the stacking direction, one of the first substrate (11) and the second substrate (22) is located within the boundary of the other.

3. The membrane-free bare cell according to claim 1 or 2, characterized in that: The first pole lug (12) and the second pole lug (21) which are electrically connected to each other are welded together.

4. The membrane-free bare cell according to claim 1 or 2, characterized in that: The first pole lug (12) and the second pole lug (21) which are electrically connected to each other are insulated from the rest of the first pole lugs (12) and the second pole lugs (21).

5. The membrane-free bare cell according to claim 4, characterized in that: An insulating layer (4) is provided outside the first pole lug (12) and the second pole lug (21) which are electrically connected to each other.

6. The membrane-free bare cell according to claim 5, characterized in that: The insulating layer (4) surrounds the outer sides of the first pole lug (12) and the second pole lug (21); or, The insulating layer (4) comprises a first insulating layer (4) and a second insulating layer (4), wherein the first insulating layer (4) is arranged on a side of the first pole lug (12) facing away from the second pole lug (21), and the second insulating layer (4) is arranged on a side of the second pole lug (21) facing away from the first pole lug (12).

7. The membrane-free bare cell according to claim 1 or 2, characterized in that: In the orthographic projection in the stacking direction, the first pole lug (12) and the second pole lug (21) which are electrically connected to each other are either located within the boundary of the other; or at least part of their boundaries overlap.

8. The membrane-free bare cell according to claim 2, characterized in that: The first substrate (11) and the second substrate (22) are both square, and the distances from each side of the first substrate (11) to the corresponding side of the second substrate (22) are the same.

9. The membrane-free bare cell according to claim 1 or 2, characterized in that: The first electrode tab (12) of the first electrode sheet (1) of the first layer and the second electrode tab (21) of the second electrode sheet (2) of the last layer are located on the same side or different sides of the bare cell without a diaphragm; or, The first electrode tab (12) of each of the first electrode sheets (1) and the second electrode tab (21) of each of the second electrode sheets (2) are both located on the same side of the bare cell without a diaphragm; The first pole lug (12) of the first electrode sheet (1) of the first layer and the second pole lug (21) of the second electrode sheet (2) of the last layer are located on different sides of the bare cell without diaphragm from the first pole lug (12) of the remaining first electrode sheets (1) and the second pole lug (21) of the remaining second electrode sheets (2), and the first pole lug (12) of the remaining first electrode sheets (1) and the second pole lug (21) of the remaining second electrode sheets (2) are located on the same side of the bare cell without diaphragm.

10. A bare cell unit without a diaphragm, characterized in that: It comprises at least two bare cells without diaphragms as described in any one of claims 1 to 9, wherein the bare cells without diaphragms are stacked and connected in parallel with each other.

11. The membrane-free bare cell unit according to claim 10, characterized in that: In two adjacent bare cells without diaphragms, the first pole lug (12) and the second pole lug (21) electrically connected to each other in one of the bare cells without diaphragms and the first pole lug (12) and the second pole lug (21) electrically connected to each other in the other bare cell without diaphragms are located on different sides of the bare cell unit without diaphragms.

12. A diaphragm-free battery, characterized in that: It comprises the bare cell without diaphragm as described in any one of claims 1 to 9, or the bare cell without diaphragm unit as described in any one of claims 10 to 11.

13. A diaphragm-free battery module, characterized in that: The invention comprises a plurality of diaphragm-less batteries as claimed in claim 12, wherein the plurality of diaphragm-less batteries are connected in series and / or in parallel.

14. An electrical device, characterized in that: Including the diaphragm-free battery as described in claim 12; or, including the diaphragm-free battery module as described in claim 13.

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