Battery cell assembly, battery and vehicle

Abstract

The utility model discloses a battery cell assembly, a battery and a vehicle, the battery cell assembly comprises: two outer layer pole pieces which are spaced in the thickness direction; the multiple inner-layer pole pieces are arranged between the two outer-layer pole pieces at intervals, active material layers are arranged on the two sides of each inner-layer pole piece in the thickness direction, and the active material layers are only arranged on the sides, facing each other, of the two outer-layer pole pieces. According to the battery cell assembly disclosed by the utility model, the active material layers are only arranged on the sides, facing each other, of the two outer-layer pole pieces, and the sides, deviating from each other, of the two outer-layer pole pieces are not provided with the active material layers, so that the waste of active materials is avoided, the manufacturing cost is reduced, the thickness of the battery cell assembly is reduced, and the production efficiency is improved. And the energy density of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery core assembly, a battery and a vehicle. Background Art

[0002] In the related art, both the positive and negative electrode sheets in the traditional laminated battery are coated with active material layers on their front and back sides. After the positive and negative electrode sheets are alternately stacked, the active material layer coated on the outward side of the top and bottom electrode sheets does not react with the corresponding active material layer, and therefore cannot be used as an active material to participate in the chemical reaction inside the laminated battery. On the one hand, it causes a waste of the active material layer, and on the other hand, it limits the energy density of the laminated battery to a certain extent, affecting the battery capacity. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery cell assembly. According to the battery cell assembly of the utility model, an active material layer is only provided on the side of the two outer pole pieces facing each other. Since the active material layer is not provided on the side of the two outer pole pieces facing away from each other, there will be no waste of active material, which reduces the manufacturing cost, reduces the thickness of the battery cell, and improves the energy density of the battery.

[0004] The utility model also provides a battery having the battery core.

[0005] The utility model also provides a vehicle with the battery.

[0006] According to the utility model, the battery cell assembly includes: an outer pole sheet, which is constructed as two and spaced apart in the thickness direction; an inner pole sheet, which is constructed as a plurality of inner pole sheets and spaced apart between the two outer pole sheets, wherein each of the inner pole sheets is provided with an active material layer on both sides in the thickness direction, and the two outer pole sheets are provided with the active material layer only on the side facing each other.

[0007] According to the battery cell assembly of the present application, active material layers are respectively arranged on both sides of the inner electrode sheet in the thickness direction, and active material layers are arranged only on the sides of the two outer electrode sheets facing each other, so that active material layers that can react with each other are arranged on both the inner electrode sheet and the outer electrode sheet. Since there is no active material layer that reacts with the sides of the two outer electrode sheets facing away from each other, active material layers are not arranged on the sides of the two outer electrode sheets facing away from each other, thereby avoiding waste of active materials, reducing manufacturing costs, reducing the thickness of the battery cell, and improving the energy density of the battery.

[0008] According to some embodiments of the present invention, the inner electrode sheet includes: a positive electrode sheet and a first negative electrode sheet, and the positive electrode sheet and the first negative electrode sheet are respectively constructed in multiple pieces and are alternately arranged in the thickness direction.

[0009] According to some embodiments of the present invention, the number of the positive electrode plates is n1, the number of the first negative electrode plates is n2, and n1-n2=1 is satisfied.

[0010] According to some embodiments of the present invention, the outer electrode sheet is configured as a second negative electrode sheet.

[0011] According to some embodiments of the utility model, each of the inner electrode sheets is provided with a first mounting surface and a second mounting surface on both sides in the thickness direction, the active material layer is provided on the first mounting surface and the second mounting surface respectively, and the projections of the first mounting surface and the second mounting surface in the thickness direction overlap.

[0012] According to some embodiments of the present invention, the thickness of the active material layer located on the first mounting surface is equal to that of the active material layer located on the second mounting surface.

[0013] According to some embodiments of the present invention, the battery cell assembly further includes: a diaphragm, which is arranged between two adjacent inner pole pieces and between the inner pole piece and the outer pole piece.

[0014] According to some embodiments of the present invention, the diaphragm is folded in the thickness direction or the diaphragm is constructed in multiple forms, and the multiple diaphragms are arranged in sequence and spaced apart in the thickness direction.

[0015] The battery according to the utility model is briefly described below.

[0016] The battery according to the utility model is provided with the battery cell assembly described in any one of the above embodiments. Since the battery according to the utility model is provided with the battery cell assembly described in any one of the above embodiments, the battery according to the present application has higher energy density, longer endurance and lower manufacturing cost.

[0017] The vehicle according to the present utility model is briefly described below.

[0018] The vehicle according to the utility model is provided with a battery as described in any one of the above embodiments. Since the vehicle according to the utility model is provided with a battery as described in any one of the above embodiments, the cruising range of the vehicle according to the present application is significantly improved.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic structural diagram of a battery cell assembly when the diaphragm is folded according to an embodiment of the utility model;

[0022] Figure 2 This is a schematic structural diagram of a battery cell assembly when diaphragms are stacked according to an embodiment of the utility model;

[0023] Figure 3 It is a schematic structural diagram of the inner pole piece when the diaphragm is folded according to an embodiment of the utility model;

[0024] Figure 4 It is a schematic structural diagram of an inner electrode piece when the diaphragms are stacked according to an embodiment of the utility model;

[0025] Figure 5 It is a schematic structural diagram of an outer pole piece according to an embodiment of the utility model.

[0026] Reference numerals:

[0027] 100. Battery cell assembly;

[0028] 11. inner electrode sheet; 112. positive electrode sheet; 113. first negative electrode sheet;

[0029] 12. Outer electrode; 13. Diaphragm; 14. Active material layer. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the related art, both the positive and negative electrode sheets in the traditional laminated battery are coated with active material layers on their front and back sides. After the positive and negative electrode sheets are alternately stacked, the active material layer coated on the outward side of the top and bottom electrode sheets does not react with the corresponding active material layer, and therefore cannot be used as an active material to participate in the chemical reaction inside the laminated battery. On the one hand, it causes a waste of the active material layer, and on the other hand, it limits the energy density of the laminated battery to a certain extent, affecting the battery capacity.

[0032] Reference below Figure 1-Figure 3A battery cell assembly according to an embodiment of the utility model is described.

[0033] According to the utility model, the battery cell assembly 100 includes: an outer pole piece 12 and an inner pole piece 11, wherein the outer pole piece 12 is constructed as two and is spaced apart in the thickness direction; a plurality of inner pole pieces 11 are constructed and are spaced apart between the two outer pole pieces 12, wherein each inner pole piece 11 is provided with an active material layer 14 on both sides in the thickness direction, and the two outer pole pieces 12 are provided with an active material layer 14 only on the side facing each other.

[0034] In some specific embodiments, the battery cell assembly 100 is composed of an inner electrode sheet 11 and an outer electrode sheet 12. The outer electrode sheet 12 can be constructed as two, and the two outer electrode sheets 12 are spaced apart in the thickness direction so that a certain accommodation space is formed between the two outer electrode sheets 12. The inner electrode sheet 11 is accommodated in the accommodation space. The inner electrode sheets 11 are constructed as multiple, and each inner electrode sheet 11 is provided with an active material layer 14 on both sides in the thickness direction. The active material layers 14 arranged between two adjacent inner electrode sheets 11 can react with each other. The two outer electrode sheets 12 are provided with active material layers 14 only on the side facing each other. Both the inner electrode sheet 11 and the outer electrode sheet 12 have active material layers 14 that can react with each other. Since there is no active material layer 14 that reacts with the side of the two outer electrode sheets 12 facing away from each other, the active material layer 14 is not provided on the side of the two outer electrode sheets 12 facing away from each other, thereby avoiding waste of active materials, reducing manufacturing costs, reducing the thickness of the battery cell, and improving the energy density of the battery.

[0035] According to the battery cell assembly 100 of the present application, active material layers 14 are respectively arranged on both sides of the inner electrode sheet 11 in the thickness direction, and active material layers 14 are only arranged on the sides of the two outer electrode sheets 12 facing each other, so that active material layers 14 that can react with each other are arranged on both the inner electrode sheet 11 and the outer electrode sheet 12. Since there is no active material layer 14 that reacts with the sides of the two outer electrode sheets 12 facing away from each other, active material layers 14 are not arranged on the sides of the two outer electrode sheets 12 facing away from each other, thereby avoiding waste of active materials, reducing manufacturing costs, reducing the thickness of the battery cell, and improving the energy density of the battery.

[0036] According to some embodiments of the present invention, the inner electrode sheet 11 includes: a positive electrode sheet 112 and a first negative electrode sheet 113 , and the positive electrode sheet 112 and the first negative electrode sheet 113 are respectively constructed in multiple pieces and are alternately arranged in the thickness direction.

[0037] In some specific embodiments, the inner electrode sheet 11 is composed of a positive electrode sheet 112 and a first negative electrode sheet 113, the active material layer 14 includes a positive electrode active material layer 14 and a negative electrode active material layer 14, the positive electrode sheet 112 is provided with positive electrode active material layers 14 on both sides in the thickness direction, and the first negative electrode sheet 113 is provided with negative electrode active material layers 14 on both sides in the thickness direction, a plurality of positive electrode sheets 112 and a plurality of first negative electrode sheets 113 are opposite to each other and arranged alternately in the thickness direction, so that a plurality of positive electrode active material layers 14 correspond to a plurality of negative electrode active material layers 14 one by one, and the active material in the positive electrode active material layer 14 can fully react with the active material in the negative electrode active material layer 14, thereby improving the utilization rate of the positive electrode sheet 112 and the first negative electrode sheet 113 and improving the energy density of the battery.

[0038] In addition, multiple positive electrode sheets and multiple first negative electrode sheets are staggered with each other in the thickness direction of the battery cell. The alternating arrangement of the positive electrode sheets and the first negative electrode sheets allows the current to flow evenly between the multiple positive and negative electrode sheets in the inner electrode sheet 11, thereby avoiding the current concentration problem caused by the sequential arrangement of multiple positive electrode sheets and multiple first negative electrode sheets (that is, the current flows more in certain areas of the battery and less in other areas), reducing the heat concentration problem inside the battery cell assembly 100, improving the safety of the battery cell assembly 100, and extending the service life of the battery cell assembly 100.

[0039] According to some embodiments of the present invention, the number of positive electrode sheets 112 is n1, the number of first negative electrode sheets 113 is n2, and n1-n2=1 is satisfied.

[0040] In some specific embodiments, the number of positive electrode sheets 112 included in the inner electrode sheet 11 is n1, and the number of first negative electrode sheets 113 included in the inner electrode sheet 11 is n2, wherein n1 and n2 satisfy the following relationship: n1-n2=1.

[0041] When n1 and n2 satisfy the above relationship, the uppermost electrode sheet and the lowermost electrode sheet of the inner electrode sheet 11 are both positive electrode sheets 112 , thereby ensuring that positive electrode active material layers 14 are provided on both sides of the inner electrode sheet 11 facing the outer electrode sheet 12 in the thickness direction.

[0042] According to some embodiments of the utility model, the two outer electrode sheets 12 are both constructed as second negative electrode sheets, and the two second negative electrode sheets can be arranged corresponding to the topmost and bottommost positive electrode sheets 112 of the inner electrode sheet 11, so that the negative electrode active material layers 14 arranged on the two second negative electrode sheets on the side facing each other have positive electrode active material layers 14 that react with them, so that the active material layers 14 arranged on the outer electrode sheets 12 can also fully react, thereby improving the charging and discharging efficiency of the battery cell assembly 100.

[0043] The type and proportion of the active material in the negative electrode active material layer 14 can also be set according to actual needs, and can include materials such as graphite, hard carbon, silicon, silicon oxide, etc., without further limitation here. The type and proportion of the active material in the positive electrode active material layer 14 can also be set according to actual needs, and can include materials such as lithium cobalt oxide, lithium iron phosphate, lithium manganese oxide, etc., without further limitation here.

[0044] According to some embodiments of the utility model, a first mounting surface and a second mounting surface are respectively provided on both sides of each inner electrode sheet 11 in the thickness direction. Since the projections of the first mounting surface and the second mounting surface in the thickness direction are the same, the area of ​​the first mounting surface is the same as the area of ​​the second mounting surface, and active material layers 14 are respectively provided on the first mounting surface and the second mounting surface. Therefore, the areas of the active material layers 14 provided on both sides of each inner electrode sheet 11 in the thickness direction are equal, and the active material layers 14 provided on two adjacent inner electrode sheets 11 are all opposite to each other and can be completely fitted, so that the reaction of the active material layer 14 between the two adjacent inner electrode sheets 11 is more sufficient, thereby improving the charging and discharging efficiency of the battery cell assembly 100.

[0045] In addition, the active material layer 14 is more evenly distributed in the inner electrode sheet 11, reducing the risk of local hot spots inside the battery cell assembly 100, thereby improving the safety of the battery cell assembly 100. When the battery has abnormal conditions such as thermal runaway, the evenly distributed active material layer 14 helps to slow down the heat diffusion rate and reduce the occurrence of safety accidents such as battery explosion.

[0046] According to some embodiments of the present invention, the thickness of the active material layer 14 located on the first mounting surface is equal to that of the active material layer 14 located on the second mounting surface.

[0047] In some specific embodiments, the area of ​​the first mounting surface is equal to the area of ​​the second mounting surface, and the thickness of the active material layer 14 arranged on both sides of each inner electrode sheet 11 in the thickness direction is the same, that is, the amount of active material dressing arranged on both sides of each inner electrode sheet 11 in the thickness direction is equal, so that the tension on both sides of each inner electrode sheet 11 is equal, thereby improving the mechanical strength of the inner electrode sheet 11 and thus improving the quality of the inner electrode sheet 11; at the same time, the electrode sheet will not produce cracks or broken strips due to uneven tension on both sides in the thickness direction, thereby improving the quality of the battery cell assembly 100.

[0048] According to some embodiments of the present invention, the battery cell assembly 100 further includes: a diaphragm 13 , which is disposed between two adjacent inner pole pieces 11 and between the inner pole piece 11 and the outer pole piece 12 .

[0049] In some specific embodiments, in order to prevent the positive electrode active material layer 14 coated on the positive electrode plate 112 from directly contacting the negative electrode active material layer 14 coated on the first negative electrode plate 113 or the second negative electrode plate, and to improve the safety of the battery during operation, a diaphragm 13 is also provided in the battery cell assembly 100, and a diaphragm 13 is provided between the positive electrode plate 112 and the first negative electrode plate 113, and between the positive electrode plate 112 and the second negative electrode plate. The diaphragm 13 can separate the positive electrode active material layer 14 from the negative electrode active material layer 14 to prevent the positive electrode and the negative electrode from contacting and short-circuiting. In addition, a microporous structure is provided on the diaphragm 13, which allows electrolyte ions to pass through, thereby supporting the charging and discharging process of the battery.

[0050] According to some embodiments of the present invention, the diaphragm 13 is folded in the thickness direction or the diaphragm 13 is configured as a plurality of diaphragms 13, and the plurality of diaphragms 13 are sequentially spaced and arranged in the thickness direction.

[0051] In some specific embodiments, a diaphragm 13 may be provided in the battery cell assembly 100 of the present application. The diaphragm 13 is folded in the thickness direction and formed with a plurality of accommodating cavities. The inner electrode sheet 11 and the outer electrode sheet 12 are respectively accommodated in the corresponding accommodating cavities, which can effectively isolate the positive electrode sheet 112 and the negative electrode sheet in the battery cell assembly 100 to avoid direct contact between them, prevent battery short circuit and combustion, and enhance the safety of the battery. At the same time, it also helps ions flow in a relatively narrow space, reducing the possibility of current passing directly between the positive and negative electrodes, thereby improving the electrochemical performance and energy density of the battery.

[0052] In other specific embodiments, a plurality of diaphragms 13 may be provided in the battery cell assembly 100 of the present application, and the plurality of diaphragms 13 are arranged in sequence and spaced apart in the thickness direction. A layer of diaphragm 13 is provided between two adjacent inner electrode sheets 11, and a side diaphragm 13 is provided between the inner electrode sheet 11 and the outer electrode sheet 12. The design of the diaphragm 13 enables the electrode sheets in the battery cell assembly 100 to be arranged more compactly and orderly, thereby improving the stability of the overall structure of the battery cell assembly 100. In addition, since the design of the diaphragm 13 is relatively simple in structure, it can be mass-produced on an automated production line, thereby improving the production efficiency of the battery cell.

[0053] The battery according to the utility model is briefly described below.

[0054] The battery according to the present invention is provided with the battery cell assembly 100 described in any one of the above embodiments. Since the battery according to the present invention is provided with the battery cell assembly 100 described in any one of the above embodiments, the battery according to the present application has higher energy density, longer battery life and lower manufacturing cost.

[0055] The vehicle according to the present utility model is briefly described below.

[0056] The vehicle according to the utility model is provided with a battery as described in any one of the above embodiments. Since the vehicle according to the utility model is provided with a battery as described in any one of the above embodiments, the cruising range of the vehicle according to the present application is significantly improved.

[0057] In the description of the present invention, 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 invention and simplifying the description, and do not indicate or imply that the referred device or element 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 invention.

[0058] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0059] In the description of the present invention, "plurality" means two or more.

[0060] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0061] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0062] In the description of this specification, the description with 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 the utility model. In this specification, 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 one or more embodiments or examples in a suitable manner.

[0063] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell assembly (100), characterized in that: include: An outer pole piece (12), the outer pole piece (12) being structured as two and spaced apart in a thickness direction; An inner electrode sheet (11), wherein a plurality of inner electrode sheets (11) are constructed and are arranged at intervals between two outer electrode sheets (12), wherein each inner electrode sheet (11) is provided with an active material layer (14) on both sides in the thickness direction, and the two outer electrode sheets (12) are provided with the active material layer (14) only on the side facing each other.

2. The battery cell assembly (100) according to claim 1, characterized in that: The inner electrode sheet (11) comprises: a positive electrode sheet (112) and a first negative electrode sheet (113); the positive electrode sheet (112) and the first negative electrode sheet (113) are respectively constructed in multiple numbers and are alternately arranged in the thickness direction.

3. The battery cell assembly (100) according to claim 2, characterized in that: The number of the positive electrode sheets (112) is n1, the number of the first negative electrode sheets (113) is n2, and n1-n2=1 is satisfied.

4. The battery cell assembly (100) according to claim 1, characterized in that: The outer electrode sheet (12) is constructed as a second negative electrode sheet.

5. The battery cell assembly (100) according to claim 2, characterized in that: Each inner layer pole piece (11) is provided with a first mounting surface and a second mounting surface on both sides in the thickness direction, the active material layer (14) is provided on the first mounting surface and the second mounting surface respectively, and the projections of the first mounting surface and the second mounting surface in the thickness direction overlap.

6. The battery cell assembly (100) according to claim 5, characterized in that: The thickness of the active material layer (14) located on the first mounting surface is equal to the thickness of the active material layer (14) located on the second mounting surface.

7. The battery cell assembly (100) according to claim 1, characterized in that: Also includes: A diaphragm (13), wherein the diaphragm (13) is arranged between two adjacent inner pole pieces (11) and between the inner pole piece (11) and the outer pole piece (12).

8. The battery cell assembly (100) according to claim 7, characterized in that: The diaphragm (13) is arranged in a folded manner in the thickness direction, or the diaphragm (13) is constructed in multiple forms, and the multiple diaphragms (13) are arranged in sequence and spaced apart in the thickness direction.

9. A battery, characterized in that: A battery cell assembly (100) comprising any one of claims 1-8.

10. A vehicle, characterized in that: A battery comprising the battery of claim 9.

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