CN216624510U - Battery with improved battery capacity - Google Patents

Abstract

A battery comprises a packaging film shell and a battery cell unit arranged in the packaging film shell, wherein the packaging film shell is provided with at least two battery cell accommodating grooves; the battery cell accommodating tanks are arranged at intervals, at least one sealing area and at least one communication area are arranged between the adjacent battery cell accommodating tanks, and the adjacent battery cell accommodating tanks are communicated through the communication areas; the battery cell units are arranged in the battery cell accommodating grooves and are adjacent to each other, and the battery cell units are electrically connected with each other. The packaging film shell is internally provided with more than two battery cell accommodating tanks, the adjacent battery cell accommodating tanks are physically connected through the sealing area and the communicating area, the space utilization rate of the battery is improved, the communicating area can also provide a storage space for electrolyte, so that the liquid retention capacity of the battery electrolyte is improved, and the cycle performance of the battery is improved. And can improve the efficiency of battery encapsulation and income shell through a plurality of electric core holding tanks of many pits towards a plurality of one shot forming, can follow the process moreover and minimize the difference, improve the uniformity of electric core voltage, capacity.

Description

Battery with improved battery capacity

Technical Field

The utility model belongs to the technical field of lithium battery manufacturing, and particularly relates to a battery.

Background

Lithium batteries are commonly used in various electronic devices such as mobile phones, notebooks, electric vehicles, unmanned aerial vehicles and the like. Because the capacity and the voltage of the single batteries can not directly meet the requirements of a large-scale mobile energy storage device or a fixed energy storage device, a plurality of single batteries can form the battery module in a series-parallel connection mode. Due to differences or fluctuations in factors such as raw materials, manufacturing processes, equipment differences, and environments, there may be some differences in performance between different unit cells. Often, a battery module includes a plurality of battery cells, and the performance of the battery module is determined by the plurality of batteries with the worst performance of a single performance parameter. When a plurality of single batteries are adopted to form the battery module, the difference of the single batteries can cause the reduction of the battery capacity, the shortening of the service life and even the occurrence of fire explosion and other consequences. And current battery cell's packaging structure electrolyte can produce the liquid phenomenon that rises under low vacuum or high vacuum state, overflows easily or leads to the infiltration effect poor, and this not only influences the encapsulation effect, still can make the liquid retaining volume of electrolyte reduce, leads to the battery performance to descend to further influence the performance of battery module.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a battery, which can ensure the consistency of parameters such as voltage, capacity and the like of a single battery, simultaneously improve the liquid retention of electrolyte and improve the cycle performance of the battery.

In order to achieve the purpose, the utility model adopts the following technical solutions:

a battery comprises an encapsulation film shell and a battery cell unit arranged in the encapsulation film shell, wherein the encapsulation film shell is provided with at least two battery cell accommodating grooves; the battery cell accommodating grooves are arranged at intervals, at least one sealing area and at least one communication area are arranged between the adjacent battery cell accommodating grooves, and the adjacent battery cell accommodating grooves are communicated through the communication areas; the electric core units are arranged in the electric core accommodating grooves and are electrically connected with each other.

Furthermore, the positive electrode tab and the negative electrode tab of the battery cell unit are respectively connected with the positive electrode tab and the negative electrode tab of the battery cell unit adjacent to the positive electrode tab and the negative electrode tab of the battery cell unit to form parallel connection.

Furthermore, the positive electrode tab and the negative electrode tab of the cell unit are respectively connected with the negative electrode tab and the positive electrode tab of the cell unit adjacent to the positive electrode tab to form series connection.

Further, the cell unit is configured to be capable of being flipped toward a cell unit adjacent thereto, and a plurality of the cell units are stacked in a thickness direction thereof.

Further, the battery cell unit winds the area between the battery cell accommodating grooves and is stacked on the battery cell unit adjacent to the battery cell unit.

Further, when a plurality of the battery cell units are stacked in the thickness direction, the projections of the plurality of the battery cell units on the plane where the bottom surface of the battery cell accommodating groove is located coincide.

Further, the distance between the adjacent battery cell units in the length direction of the packaging film shell is 2-14 mm.

Further, the top and the side of the packaging film shell are respectively provided with a top sealing area and a side sealing area.

Furthermore, the packaging film shell is formed by punching and packaging an aluminum plastic film and a folded film.

Furthermore, the packaging film shell is formed by punching and laminating two aluminum plastic films in a packaging manner.

According to the technical scheme, more than two battery cell accommodating grooves are arranged in the packaging film shell, and the adjacent battery cell accommodating grooves are in physical connection through the sealing area and the communication area, so that the space utilization rate of the battery can be improved, and the communication area can provide a storage space for electrolyte, so that the electrolyte retaining amount of the battery is increased, and the cycle performance of the battery is improved. And the membrane shell can be through many pits towards the type and go out a plurality of electric core holding tanks, pack into a membrane shell with a plurality of electric core units in order, greatly improve the battery encapsulation and go into the production efficiency of shell. In addition, the battery cell units with the tracing information can be sequentially arranged in the packaging film shell, so that the process difference is reduced as much as possible in the aspect of manufacturing process, the consistency of the voltage and the capacity of the battery cell units is improved, and the performance difference in the battery pack of the battery module is reduced.

Drawings

In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive effort.

FIG. 1 is a schematic diagram of a battery according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

FIG. 3 is a schematic view of an embodiment of a packaging film case of the present invention when unfolded;

fig. 4 is a schematic diagram of a packaged film casing with a battery cell mounted therein according to an embodiment of the present invention;

FIG. 5 is a schematic view showing a battery according to an embodiment of the present invention folded in half;

fig. 6 is a schematic view of an area between adjacent cell accommodating grooves when the battery according to the embodiment of the present invention is folded in half;

FIG. 7 is a schematic view of another embodiment of an encapsulating film shell in accordance with an embodiment of the utility model;

FIG. 8 is an expanded view of another embodiment of a packaging film shell, according to an embodiment of the utility model.

Detailed Description

The utility model will be described in detail below with reference to the accompanying drawings, wherein for the purpose of illustrating embodiments of the utility model, the drawings showing the structure of the device are not to scale but are partly enlarged, and the schematic drawings are only examples, and should not be construed as limiting the scope of the utility model. It is to be noted, however, that the drawings are designed in a simplified form and are not to scale, but rather are to be construed in an attempt to more clearly and concisely illustrate embodiments of the present invention. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated; the terms "front," "back," "bottom," "upper," "lower," and the like refer to an orientation or positional relationship relative to a reference plane of a drawing that is illustrated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention

As shown in fig. 1, the battery of the present embodiment includes a packaging film casing 1 and cell units (not shown) disposed in the packaging film casing 1, where at least two cell units are disposed in the packaging film casing 1, and the cell units are adjacently disposed at intervals. The pole ear 2 of the battery cell unit penetrates out of the packaging film shell 1 from the top of the packaging film shell 1. The bar code 3 can be sprayed outside the packaging film shell 1, and a plurality of cell bar codes are bound with each other or a plurality of cells use one bar code, so that the information can be conveniently traced. The packaging film shell 1 can be made of an aluminum plastic film consisting of a nylon layer, an aluminum layer, a PP layer and an interlayer adhesive. For example, as shown in fig. 3, a cell accommodating groove 1a for accommodating the cell unit is formed in a pit punching region of the aluminum plastic film by a punching process, the cell accommodating grooves 1a are adjacently arranged at intervals, and the cell unit is placed in the cell accommodating groove 1 a. As shown in fig. 4, after the aluminum plastic film is folded and sealed, an air pocket 1b communicating with the cell accommodating groove 1a is formed beside the cell accommodating groove 1 a. This embodiment is provided with an air pocket 1b respectively in the outside of every electric core holding tank 1a (the one side of keeping away from another electric core holding tank of electric core holding tank), is linked together between air pocket 1b and the electric core holding tank 1a to produced gas can be collected in the air pocket 1b when becoming. When the finished battery is manufactured, the air bag 1b is cut off after formation and secondary sealing.

The whole depth of the battery cell accommodating groove 1a is not more than 7 mm. As shown in fig. 2 and 4, at least one seal region 1c is formed between two adjacent cell accommodating grooves 1 a. The distance between two adjacent cell accommodating grooves 1a in the length direction (the direction indicated by the y axis in fig. 4) of the encapsulating film casing 1 is set according to the thickness of the cell unit (i.e., the depth L of the cell accommodating groove), and may generally be set to 2mm to 14mm, i.e., the length d of the sealing region 1c may be 2mm or more and d or less and 14mm or less. Control except that the region of seal district 1c between the adjacent electric core holding tank 1a, other regions are connected region 1d, pour into electrolyte into the back, and the electrolyte in the adjacent electric core holding tank 1a can be through the mutual circulation of connected region 1d, and connected region 1d can provide storage space for electrolyte. The width w of the sealing region 1c is set according to the height of the battery, that is, the width (the size in the x-axis direction in fig. 4) of the packaging film case 1, the width of the packaging film case 1 may be 3mm to 200mm, the width w of the sealing region 1c is set according to the number of the sealing regions 1c and the width of the packaging film case 1, and may be 1mm to 30mm, and after the size of the packaging film case 1 and the number and size of the sealing regions 1c are determined, the number, length, and width of the communication regions 1d are determined accordingly. When a plurality of seal regions and a plurality of communicating regions are provided, the seal regions can be arranged in parallel or not in parallel, and the communicating regions can be the same or different in size or shape.

For convenience of description, the side of the packaging film case 1 close to the tab 2 is defined as upper, the side far away from the tab 2 is defined as lower, i.e., the side of the tab 2 on the top of the packaging film case 1, and the side opposite to the tab 2 is the bottom of the packaging film case 1. In addition to the seal region 1c between the adjacent cell accommodating grooves 1a, the top seal region 1e and the side seal region 1f are also provided at the top and the side of the package structure. The encapsulation membrane shell 1 of this embodiment is once towards the type by an plastic-aluminum membrane and is accomplished, promptly after the punching press formed electric core holding tank 1a, upwards fold the plastic-aluminum membrane from the bottom, form encapsulation membrane shell 1 after each seal position seal, air pocket 1b is located electric core holding tank 1 a's side, electric core unit places in electric core holding tank 1a, the physical connection of a plurality of electric core units can be realized to seal district 1c and intercommunication district 1d between the adjacent electric core holding tank 1a, form combined battery, folding battery area is directly constituteed to these electric core units. As shown in fig. 5 and fig. 6, the region of the packaging film casing 1 (battery) between the adjacent battery cell accommodating grooves 1a is bent and folded, that is, the battery cell units are folded around the region between the battery cell accommodating grooves 1a, and then the battery module comprising a plurality of battery cell units stacked together in the thickness direction of the battery cell units can be obtained, and the projections of the battery cell units stacked together on the plane of the bottom surface of the battery cell accommodating grooves are overlapped. When the cell units are stacked, one cell unit may be turned over toward another cell unit, so that it is stacked on another cell unit, as shown in fig. 5; and every N battery cell units (N is more than or equal to 2) can be turned and stacked together, if two battery cell units and the other two battery cell units are opposite to each other and stacked on the other two battery cell units, the stacking mode can be correspondingly adjusted according to the size requirement of the product. The cell units are electrically connected with each other and are connected in series or/and in parallel to form a battery module, for example, a positive tab and a negative tab of one cell unit are connected with positive tabs and negative tabs of one or more other cell units to form parallel connection; or the positive tab and the negative tab of one cell unit are connected with the negative tabs and the positive tabs of one or more other cell units to form series connection; the parallel battery combination or the series battery combination can be connected in parallel or in series according to the requirement to obtain the battery module with the required voltage.

The following is a description of the preparation process of the battery of the present invention:

preparing a positive plate and a negative plate, respectively coating a positive active material and a negative active material or a negative active material on a current collector through a coating process to obtain the positive plate and the negative plate, etching or spraying two-dimensional codes on each positive plate and each negative plate, and binding the two-dimensional codes with each other so as to facilitate tracing; thus, the processing parameters of the cell such as the width, the thickness, the surface density and the like of the positive plate and the negative plate are basically consistent, and the difference between the internal resistance and the K value of the cell can be reduced;

respectively carrying out die cutting on the positive plate and the negative plate, selecting the small-difference pole plates to prepare a roll core, and binding the two-dimensional codes;

manufacturing the pole piece and the diaphragm into a winding core (a battery cell unit) through a winding process, welding a tab, and selecting the winding core with small difference to perform two-dimensional code binding;

preparing a packaging film shell;

the manufactured winding cores with small difference are continuously placed into a shell and are arranged in a battery cell accommodating groove of the packaging film shell, and a plurality of winding cores with better consistency are physically bound in one packaging film shell;

the battery cell units in the packaging film shell are connected in series to form and are connected in series to be sorted, so that the capacity and the voltage of the winding core reach consistency, the battery cells can be directly packaged without matching, and the battery comprising a plurality of battery cell units is manufactured.

The packaging film shell can be internally provided with a plurality of battery cell units at one time, so that the production efficiency of the combined battery is improved, the interval seals between the adjacent battery cell units in the packaging film shell are sealed, and the battery cell accommodating tanks are physically connected together through the sealing area and the communication area, so that a battery belt with a plurality of battery cell units can be formed after the battery cell units are arranged, the working procedure is simplified, and the efficiency of casing, packaging and assembling is greatly improved. Meanwhile, the communicating area which is not sealed can be used as a storage area of electrolyte, the problem of liquid expansion of the electrolyte can be effectively solved, the electrolyte is prevented from running off, the liquid retention rate of the electrolyte is improved, the circulation performance of the battery is guaranteed, and the connecting strength between adjacent battery cell accommodating grooves can be improved by the sealing area. When the electric core unit of packing into, can begin to bind the electric core that the parameter is close from the coating process, pack into adjacent electric core holding tank, reduce the difference of the electric core of the same packaging structure of packing into as far as possible from the processing procedure to improve and close on electric core voltage capacity's in the electric core holding tank uniformity.

As shown in fig. 7 and 8, the packaging film casing includes more than 2 battery cell accommodating grooves 1a, the air pockets are disposed below the battery cell accommodating grooves 1a, and the air pockets 1b are integrally connected to the battery cell accommodating grooves 1a, i.e., are connected to the battery cell accommodating grooves 1a located above the air pockets. Have seal district 1c and intercommunication district 1d between adjacent electric core holding tank 1a, seal district 1c between this different electric core holding tank 1a can the parallel and level setting, is located same straight line promptly, also can stagger the setting each other, is located different straight lines promptly, and intercommunication district 1d also can the parallel and level setting or stagger the setting each other equally. The packaging film shell is formed by symmetrically punching and assembling two aluminum-plastic films, the two aluminum-plastic films are completely identical in structure, the two packaging films with symmetrical structures are overlapped up and down to complete film combination, and the packaging film shell is provided with a top sealing area 1e and a side sealing area 1f at the top and the side part and is also provided with a bottom sealing area 1g at the bottom, namely below the air bag 1 b. The sizes of the top sealing area 1e, the side sealing area 1f and the bottom sealing area 1g are correspondingly designed according to the product requirements.

Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model.

Claims (10)

1. The utility model provides a battery, including encapsulation membrane shell and set up in electric core unit in the encapsulation membrane shell which characterized in that:

the packaging film shell is provided with at least two battery cell accommodating grooves; the battery cell accommodating grooves are arranged at intervals, at least one sealing area and at least one communication area are arranged between the adjacent battery cell accommodating grooves, and the adjacent battery cell accommodating grooves are communicated through the communication areas; the battery cell units are arranged in the battery cell accommodating grooves and are electrically connected with each other.

2. The battery of claim 1, wherein: and the positive electrode lug and the negative electrode lug of the battery cell unit are respectively connected with the positive electrode lug and the negative electrode lug of the battery cell unit adjacent to the positive electrode lug and the negative electrode lug to form parallel connection.

3. The battery of claim 1, wherein: and the positive electrode lug and the negative electrode lug of the battery cell unit are respectively connected with the negative electrode lug and the positive electrode lug of the battery cell unit adjacent to the positive electrode lug to form series connection.

4. The battery of claim 1, wherein: the cell unit is configured to be capable of being flipped toward a cell unit adjacent thereto, and a plurality of the cell units are stacked in a thickness direction thereof.

5. The battery of claim 4, wherein: the battery cell units are wound around the areas between the battery cell accommodating grooves and stacked on the battery cell units adjacent to the battery cell units.

6. The battery of claim 4, wherein: when the plurality of battery cell units are stacked in the thickness direction of the battery cell units, the projections of the plurality of battery cell units on the plane where the bottom surfaces of the battery cell accommodating grooves are located coincide.

7. The battery of claim 1, wherein: and the distance between the adjacent battery cell units in the length direction of the packaging film shell is 2-14 mm.

8. The battery of claim 1, wherein: the top and the side of the packaging film shell are respectively provided with a top sealing area and a side sealing area.

9. The battery of claim 1, wherein: the packaging film shell is formed by punching and packaging an aluminum plastic film and a folded film.

10. The battery of claim 1, wherein: the packaging film shell is formed by punching and packaging two aluminum plastic films by overlapping a laminated film.

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