阅读说明：本技术 一种内部串联式电芯和内部串联式电池 (Internal serial-type battery cell and internal serial-type battery ) 是由 左龙龙 王飞 阳如坤 魏宏生 毛羽 于 2019-10-28 设计创作，主要内容包括：本发明提供了一种内部串联式电芯和内部串联式电池,涉及电池技术领域,该内部串联式电芯,包括外层负极件、外层正极件和电芯串联组,电芯串联组的两端分别具有正极端和负极端,外层负极件与负极端连接,外层正极件与正极端连接,电芯串联组包括多个重叠设置的内部电芯极片,每相邻两个内部电芯极片之间设置有用于阻隔电子通过的内部隔膜,且每相邻两个内部电芯极片相互构成一个供电单元,多个供电单元串联在一起。能够得到较高的输出电压,同时,结构简单,并且电子在电芯串联组内部跑的路径短,降低了电芯的整体内阻,且没有内部极耳占用空间,可以提升电芯的能量密度,也没有内部极耳集流发热,接触均匀,电芯的可靠性高,一致性好。(The invention provides an internal serial cell and an internal serial battery, and relates to the technical field of batteries. Can obtain higher output voltage, simultaneously, simple structure to the electron is short at the inside route of running of electric core series group, has reduced the whole internal resistance of electric core, and does not have inside utmost point ear occupation space, can promote the energy density of electric core, also does not have inside utmost point ear mass flow to generate heat, and the contact is even, and the reliability of electric core is high, and the uniformity is good.)

1. The utility model provides an inside serial-type electric core, its characterized in that, includes outer negative pole piece, outer positive pole piece and electric core series group, electric core series group's both ends have positive terminal and negative pole end respectively, outer negative pole piece with the negative pole end is connected, outer positive pole piece with the positive terminal is connected, electric core series group is including a plurality of inside electric core pole pieces that overlap the setting, every adjacent two be provided with the inside diaphragm that is used for the separation electron to pass through between the inside electric core pole piece, and every adjacent two inside electric core pole piece constitutes a power supply unit each other, and is a plurality of the power supply unit is in the same place in series.

2. The internal serial cell of claim 1, wherein each internal cell pole piece comprises an internal current collector, a positive electrode material layer and a negative electrode material layer, the positive electrode material layer and the negative electrode material layer are respectively coated on two side surfaces of the internal current collector, the internal diaphragm is arranged between each positive electrode material layer and the adjacent negative electrode material layer, and the positive electrode material layer and the negative electrode material layer are respectively attached to the corresponding internal diaphragm.

3. The internal series cell of claim 2, wherein the internal current collector comprises a first metal layer and a second metal layer attached to each other, wherein the surface of the first metal layer away from the second metal layer is coated with the positive electrode material layer, and the surface of the second metal layer away from the first metal layer is coated with the negative electrode material layer.

4. The internal series cell of claim 3, wherein the first metal layer and the second metal layer are separately disposed and bonded together, the first metal layer is an aluminum film layer, and the second metal layer is a copper film layer.

5. The internal series cell of claim 3, wherein the first metal layer and the second metal layer are integrally formed and are both aluminum film layers.

6. The internal series cell of claim 1, wherein the outer negative electrode member comprises a negative current collector and an outer negative electrode layer, the outer negative electrode layer is coated on one side surface of the negative current collector, and an internal diaphragm is disposed between the outer negative electrode layer and the negative electrode terminal.

7. The internal serial electric core of claim 6, wherein the edge of the negative electrode current collector is provided with a negative electrode external tab, and the negative electrode external tab extends outwards from the edge of the outer negative electrode layer.

8. The internal series-connected battery cell of claim 1, wherein the outer positive electrode member comprises a positive electrode current collector and an outer positive electrode layer, the outer positive electrode layer is coated on one side surface of the positive electrode current collector, and an internal diaphragm is arranged between the outer positive electrode layer and the negative electrode terminal.

9. The internal series-connected battery cell of claim 8, wherein an external positive tab is disposed on an edge of the positive current collector, and the external positive tab extends outward from an edge of the external positive layer.

10. An internal tandem battery comprising a housing and an internal tandem cell of any of claims 1-9, wherein the cell tandem cell is disposed within the housing.

Technical Field

The invention relates to the technical field of batteries, in particular to an internal serial battery cell and an internal serial battery.

Background

The current lithium battery cell structure consists of a positive plate, a negative plate and a diaphragm, wherein the positive plate and the negative plate are separated by the diaphragm to form a cell structure, and a cell voltage platform is 3-4V.

The existing single-cell output voltage is low, and a plurality of cells are required to be connected in series to improve the output voltage when the battery is manufactured for daily use (electric vehicles, ships, tools and the like). In this case, a Pack process is required for realization, and the structure is complex.

In view of this, it is important to design and manufacture an internal series-connected battery cell that can directly increase the output voltage of the battery cell and reduce the overall internal resistance of the battery cell, and that has a simple structure and a low process implementation difficulty.

Disclosure of Invention

The invention aims to provide an internal serial-connection type battery cell, which can directly improve the output voltage of the battery cell and reduce the integral internal resistance of the battery cell, and has simple structure and low process realization difficulty.

Another object of the present invention is to provide an internal serial battery, which has high output voltage, simple structure and low process implementation difficulty.

The invention is realized by adopting the following technical scheme.

In one aspect, the invention provides an internal serial electric core, which comprises an external negative electrode piece, an external positive electrode piece and an electric core serial group, wherein two ends of the electric core serial group are respectively provided with a positive end and a negative end, the external negative electrode piece is connected with the negative end, the external positive electrode piece is connected with the positive end, the electric core serial group comprises a plurality of internal electric core pole pieces which are arranged in an overlapped mode, an internal diaphragm for blocking electrons from passing through is arranged between every two adjacent internal electric core pole pieces, each two adjacent internal electric core pole pieces mutually form a power supply unit, and the plurality of power supply units are connected in series.

Further, every inside electric core pole piece includes inside mass flow body, anodal bed of material and negative pole bed of material, anodal bed of material with the negative pole bed of material coats respectively and sets up the both sides surface of inside mass flow body, every anodal bed of material and adjacent be provided with between the negative pole bed of material inside diaphragm, just anodal bed of material with the negative pole bed of material respectively with correspond inside diaphragm laminates mutually.

Further, the internal current collector comprises a first metal layer and a second metal layer which are attached to each other, the surface coating of the second metal layer is arranged on the first metal layer, the surface coating of the first metal layer is arranged on the positive electrode material layer, and the surface coating of the second metal layer is arranged on the negative electrode material layer.

Furthermore, the first metal layer and the second metal layer are arranged in a split mode and are bonded together, the first metal layer is an aluminum film layer, and the second metal layer is a copper film layer.

Further, the first metal layer and the second metal layer are integrally arranged and are both aluminum film layers.

Further, outer negative pole spare includes the negative current collector and outer negative pole layer, outer negative pole layer coating sets up a side surface of negative current collector, just outer negative pole layer with be provided with inside diaphragm between the negative pole end.

Further, the edge of the negative current collector is provided with a negative external tab, and the negative external tab is extended outwards from the edge of the outer negative layer.

Further, outer anodal piece includes anodal mass flow body and outer anodal layer, the coating of outer anodal layer sets up a side surface of anodal mass flow body, just outer anodal layer with be provided with inside diaphragm between the negative pole end.

Furthermore, the edge of the positive current collector is provided with a positive external tab, and the positive external tab extends outwards from the edge of the outer positive layer.

The utility model provides an inside serial-type battery, includes casing and inside serial-type electric core, and inside serial-type electric core includes outer negative pole piece, outer positive pole piece and electric core series group, electric core series group's both ends have positive terminal and negative pole end respectively, outer negative pole piece with the negative pole end is connected, outer positive pole piece with the positive terminal is connected, electric core series group is including a plurality of inside pole pieces electric core that overlap the setting, every adjacent two be provided with the inside diaphragm that is used for the separation electron to pass through between the inside electric core pole piece, and every adjacent two inside electric core pole piece constitutes a power supply unit each other, and is a plurality of the power supply unit is in the same place in series connection. The battery cell series group is arranged in the shell.

The invention has the following beneficial effects:

according to the internal serial-type battery cell provided by the invention, the plurality of internal battery cell pole pieces are directly overlapped together to form the battery cell serial-connection group, the positive end of the battery cell serial-connection group is connected with the outer-layer positive pole piece, the negative end of the battery cell serial-connection group is connected with the outer-layer negative pole piece, when the battery cell serial-connection group is actually electrified, two adjacent internal battery cell pole pieces form the power supply unit, the plurality of power supply units are connected in series together, so that higher output voltage can be obtained, meanwhile, the plurality of internal battery cell pole pieces are directly overlapped, the structure is simple, the path of electrons running inside the battery cell serial-connection group is short, the overall internal resistance of the battery cell is reduced, the occupied space of an internal pole lug is avoided, the energy density of the battery cell can be improved, the current collection and heating of the internal pole lugs.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of an internal series cell according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of the internal cell pole piece in fig. 1;

FIG. 3 is a schematic structural view of the outer cathode member of FIG. 1;

fig. 4 is a schematic structural view of the outer-layer cathode member in fig. 1.

Icon 100-internal series cells; 110-outer negative pole piece; 111-a negative current collector; 113-outer negative electrode layer; 115-negative pole external connection pole ear; 130-outer layer positive pole piece; 131-a positive current collector; 133-outer positive electrode layer; 135-positive electrode externally connected with a tab; 150-cell series group; 170-internal cell pole pieces; 171-an internal current collector; 1711-a first metal layer; 1713-a second metal layer; 173-positive electrode material layer; 175-negative electrode material layer; 190-internal diaphragm.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships conventionally put on the products of the present invention when used, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," "mounted," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. Features in the embodiments described below may be combined with each other without conflict.

First embodiment

With reference to fig. 1 to fig. 4, the present embodiment provides an internal serial-type battery cell 100, which has high output voltage, small internal resistance, simple structure, and low difficulty in process implementation.

The internal serial-type battery cell 100 provided in this embodiment, including outer negative pole piece 110, outer positive pole piece 130 and battery cell serial group 150, both ends of battery cell serial group 150 have positive terminal and negative terminal respectively, outer negative pole piece 110 is connected with the negative terminal, outer positive pole piece 130 is connected with the positive terminal, battery cell serial group 150 includes a plurality of inside battery pole pieces 170 that overlap the setting, be provided with between every two adjacent inside battery pole pieces 170 and be used for the inside diaphragm 190 that the separation electron passes through, and every two adjacent inside battery pole pieces 170 constitute a power supply unit each other, a plurality of power supply units are in series connection together.

In the present embodiment, the cell serial group 150 is accommodated in the battery case, the peripheries of the cell serial groups are bonded together by the insulating glue, and the electrolyte is filled between the adjacent internal cell pole pieces 170, and the charging and discharging principle thereof can refer to the charging and discharging principle of the existing lithium ion battery, which is not described in detail herein.

In this embodiment, the internal cell pole pieces 170 are tightly attached to the separator, so that the occupied space of the internal cell pole pieces 170 is reduced, and the volume of the whole battery is reduced.

Each internal battery pole piece 170 includes an internal current collector 171, a positive electrode material layer 173 and a negative electrode material layer 175, the positive electrode material layer 173 and the negative electrode material layer 175 are respectively coated on the surfaces of the two sides of the internal current collector 171, an internal diaphragm 190 is arranged between each positive electrode material layer 173 and the adjacent negative electrode material layer 175, and the positive electrode material layer 173 and the negative electrode material layer 175 are respectively attached to the corresponding internal diaphragm 190, so that the volume of the whole battery core can be further reduced.

It should be noted that the internal separator 190 mentioned in this embodiment is consistent with the separator structure adopted in the existing battery, and the commercially available separator material is mainly a Polyolefin (Polyolefin) separator mainly made of Polyethylene (PE) and polypropylene (PP), wherein the PE product is mainly made by a wet process, and the PP product is mainly made by a dry process. The main diaphragm material products comprise single-layer PP, single-layer PE, PP + ceramic coating, PE + ceramic coating, double-layer PP/PE, double-layer PP/PP, three-layer PP/PE/PP and the like, wherein the first two products are mainly used in the field of 3C small batteries, and the latter products are mainly used in the field of power lithium batteries. The material for disassembling the diaphragm is not particularly limited.

In this embodiment, the internal current collector 171 has a plate shape, and one surface of the internal current collector 171 is coated with a positive electrode material and a negative electrode material, wherein the main active material in the positive electrode material is lithium manganate, lithium cobaltate, lithium iron phosphate, or the like, or a mixture thereof, and the main active material in the negative electrode material is lithium titanate, graphite, or the like, or a mixture thereof. Of course, the positive electrode material and the negative electrode material are merely examples, and there is no limitation as to which material is specifically used.

It should be noted that in the present embodiment, the size of the internal diaphragm 190 should be larger than that of the internal current collector 171, specifically, the distance that the edge of the internal diaphragm 190 extends out of the cell series group 150 is between 0.5 mm and 2mm, so as to completely isolate the electrical connection between two adjacent internal cell pole pieces 170.

In this embodiment, the thicknesses of the positive electrode material layer 173 and the negative electrode material layer 175 are the same and are both between 0.1 mm and 2mm, the thickness of the internal membrane 190 is between 30 μm and 80 μm, and the internal membrane 190 can block electrons from passing through both sides, thereby ensuring the electrical isolation effect.

It should be noted that, in this embodiment, the number of the internal cell pole pieces 170 may be matched according to the actual requirement of the output voltage. Different output voltages can be achieved by stacking different numbers of internal cell pole pieces 170.

The internal current collector 171 includes a first metal layer 1711 and a second metal layer 1713 attached to each other, the surface of the first metal layer 1711, which is away from the second metal layer 1713, is coated with a positive electrode material layer 173, and the surface of the second metal layer 1713, which is away from the first metal layer 1711, is coated with a negative electrode material layer 175. Here, the first metal layer 1711 and the second metal layer 1713 are electrically connected to each other, and function as a plurality of power supply units connected in series.

In this embodiment, the internal current collector 171 is a metal foil that is formed by combining a first metal layer 1711 and a second metal layer 1713. The first metal layer 1711 and the second metal layer 1713 are arranged in a split manner and are bonded together, the first metal layer 1711 is an aluminum film layer, and the second metal layer 1713 is a copper film layer. Of course, the materials of the first metal layer 1711 and the second metal layer 1713 are merely illustrative and not meant to be limiting, and in other preferred embodiments of the present invention, the first metal layer 1711 and the second metal layer 1713 may be other conductive metal materials, such as gold, silver, or other alloy materials.

In other preferred embodiments of the present invention, the first metal layer 1711 and the second metal layer 1713 are integrally formed and are both aluminum films. Specifically, the first metal layer 1711 and the second metal layer 1713 are integrally formed and made of the same material, that is, the internal current collector 171 has a single-layer structure, which can also function to connect a plurality of power supply units in series.

The outer negative pole piece 110 comprises a negative pole current collector 111 and an outer negative pole layer 113, the outer negative pole layer 113 is coated on one side surface of the negative pole current collector 111, and an internal diaphragm is arranged between the outer negative pole layer 113 and the negative pole end.

It should be noted that in this embodiment, the arrangement between the negative current collector 111 and the negative end of the cell series group 150 is not limited to only providing a single outer negative layer 113, and a separator, a positive layer, and an additional negative layer may also be additionally provided, that is, the arrangement between the negative current collector 111 and the negative end is not limited to only a single-layer structure, but may also be a multi-layer structure, as long as the series condition is satisfied.

In this embodiment, the edge of the negative electrode current collector 111 is provided with a negative external tab 115, and the negative external tab 115 extends outward from the edge of the outer negative layer 113. And a tab 115 is externally connected with the negative electrode to serve as the negative electrode of the whole battery cell.

It should be noted that the negative electrode current collector 111 is also plate-shaped and made of metal material, and is coated with negative electrode material on one side to form the outer negative electrode layer 113, where the negative electrode material is selected from the same negative electrode materials as described above.

The outer positive pole piece 130 comprises a positive pole current collector 131 and an outer positive pole layer 133, the outer positive pole layer 133 is coated on one side surface of the positive pole current collector 131, and an internal diaphragm is arranged between the outer positive pole layer 133 and the negative pole end.

It should be noted that in this embodiment, the arrangement between the positive electrode current collector 131 and the positive electrode end of the cell series group 150 is not limited to only providing a single-layer positive electrode layer 133 as the outer layer, and a separator, a negative electrode layer, and an additional positive electrode layer may also be additionally provided, that is, the arrangement between the positive electrode current collector 131 and the positive electrode end is not limited to only a single-layer structure, but may also be a multilayer structure, as long as the series condition can be satisfied.

In this embodiment, the edge of the positive electrode current collector 131 is provided with a positive electrode external tab 135, and the positive electrode external tab 135 extends outward from the edge of the outer positive electrode layer. And a tab 135 is externally connected with the positive electrode to serve as the positive electrode of the whole battery cell.

It should be noted that the positive electrode current collector 131 is also in a plate shape and made of a metal material, and is coated with a positive electrode material on one side to form an outer positive electrode layer 133, where the positive electrode material is selected from the same negative electrode materials as described above.

It should be noted that, in the present embodiment, the internal separators and the internal separators 190 disposed between the internal cell pole pieces 170 are identical in structure, and all are for preventing electrons from passing through, so that a power supply unit is formed between the outer positive electrode layer 133 and the adjacent negative electrode material layer 175, and a power supply unit is formed between the outer negative electrode layer 113 and the adjacent positive electrode material layer 173.

In summary, in the internal serial-type battery cell 100 provided in this embodiment, the multiple internal battery cell pole pieces 170 are overlapped to directly connect the multiple power supply units in series, so that the output voltage of the battery cell is increased, and high-voltage battery cell outputs such as 12V, 24V, and 48V can be realized. Meanwhile, the path of the electrons running inside the battery cell is short, the integral internal resistance of the battery cell is reduced, no internal tab occupies space in the battery cell series group 150, the energy density of the battery cell can be improved, no internal tab collects current and generates heat, the reliability of the battery cell is greatly improved, and the consistency is good.

Second embodiment

The present embodiment provides an internal serial battery, which includes a housing and an internal serial battery cell 100, where the basic structure and principle of the internal serial battery cell 100 and the generated technical effect are the same as those of the first embodiment, and for the sake of brief description, where no part of this embodiment is mentioned, reference may be made to the corresponding contents in the first embodiment.

Inside serial-type electric core 100 includes outer negative pole piece 110, outer positive pole piece 130 and electric core series connection group 150, electric core series connection group 150's both ends have positive terminal and negative pole end respectively, outer negative pole piece 110 is connected with the negative pole end, outer positive pole piece 130 is connected with the positive terminal, electric core series connection group 150 includes a plurality of inside electric core pole pieces 170 that overlap the setting, be provided with the inside diaphragm 190 that is used for the separation electron to pass through between every two adjacent inside electric core pole pieces 170, and every two adjacent inside electric core pole pieces 170 constitute a power supply unit each other, a plurality of power supply units establish ties together. A cell series 150 is disposed within the housing.

In this embodiment, the outer layer negative electrode piece 110 and the outer layer positive electrode piece 130 are respectively disposed at two ends of the casing and extend out of the casing to serve as external tabs, and since the plurality of internal cell pole pieces 170 are overlapped with each other, the battery mention can be greatly reduced, and the output voltage can be improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.