阅读说明：本技术 一种电池、电器及电池生产数据的追溯方法 (Battery, electric appliance and method for tracing battery production data ) 是由 廖科军 邹浒 于 2021-08-24 设计创作，主要内容包括：本发明提供了一种电池、电器及电池生产数据的追溯方法,所述电池包括电极组件和壳体,所述电极组件封装于所述壳体的内部,所述壳体的外部和所述壳体的内部的所述电极组件上均设有识别码。本发明通过在壳体内部的电极组件和壳体外部均设置识别码,使电极组件和壳体均具有可追溯性,且通过将识别码作为获取信息的入口,能够快速获取电极组件制造过程各个步骤以及封装电极组件制造电池的各个步骤中的数据信息,追溯的准确性高,能够快速准确的锁定异常批次,查找异常原因,有利于企业的生产管理,给生产线的排查、追溯提供方便,能提高生产效率并降低生产成本。(The invention provides a battery, an electric appliance and a method for tracing production data of the battery. The identification codes are arranged on the electrode assembly inside the shell and outside the shell, so that the electrode assembly and the shell have traceability, the identification codes are used as the inlets for acquiring information, the data information in each step of the electrode assembly manufacturing process and each step of packaging the electrode assembly to manufacture the battery can be quickly acquired, the traceability accuracy is high, abnormal batches can be quickly and accurately locked, abnormal reasons can be found, the production management of enterprises is facilitated, convenience is provided for the inspection and traceability of a production line, the production efficiency can be improved, and the production cost can be reduced.)

1. A battery is characterized by comprising an electrode assembly and a shell, wherein the electrode assembly is packaged in the shell, and identification codes are arranged on the electrode assembly outside the shell and inside the shell.

2. The battery of claim 1, wherein the identification code disposed on the exterior of at least one of the housings is associated with the identification code on the electrode assembly inside at least one of the housings.

3. The battery according to claim 1,

the electrode assembly comprises pole pieces and diaphragms, the diaphragms are arranged between any two adjacent pole pieces, the pole pieces comprise current collectors and active substance layers, the areas, on which the active substance layers are arranged, of the current collectors are paste coating areas, the areas, on which the active substance layers are not arranged, of the current collectors are empty foil areas, and the edges of the current collectors are also provided with a plurality of groups of convex tab leading-out ends; the pole piece and the diaphragm are wound to form the electrode assembly with a multi-pole-lug structure, and the pole-lug leading-out end is arranged in the shell;

the identification code on the electrode assembly is arranged in the tab leading-out end or the empty foil area on the outermost side of the electrode assembly.

4. The battery according to claim 3,

the electrode assembly further comprises a tab connected with the tab lead-out end and extending to the outside of the case;

the identification code associated with the tab leading-out end is arranged in the area where the tab extends out of the shell or outside the shell;

or, the region where the tab extends to the outside of the case or the outside of the case is provided with the identification code associated with the empty foil region at the outermost side of the electrode assembly.

5. The battery according to claim 1,

the electrode assembly comprises pole pieces and diaphragms, the diaphragms are arranged between any two adjacent pole pieces, the pole pieces comprise current collectors and active substance layers, areas, provided with the active substance layers, on the current collectors are paste coating areas, and areas, not provided with the active substance layers, on the current collectors are empty foil areas; the pole piece and the separator are wound to form the electrode assembly;

the identification code on the electrode assembly is disposed in the empty foil zone at the outermost side of the electrode assembly or the empty foil zone at the innermost side of the electrode assembly.

6. The battery according to claim 5,

the electrode assembly further includes a tab connected with the pasting region and extending to the outside of the case;

the region where the tabs extend to the outside of the case or the outside of the case is provided with the identification code associated with the empty foil region on the outermost side of the electrode assembly;

or, the region where the tab extends to the outside of the case or the outside of the case is provided with the identification code associated with the empty foil region at the innermost side of the electrode assembly.

7. The battery of any of claims 1-6, wherein the identification code on the case is a bar code and the identification code on the electrode assembly is a two-dimensional code.

8. An electrical appliance comprising a battery as claimed in any one of claims 1 to 7.

9. A method for tracing battery production data, based on the battery according to any one of claims 1 to 7, comprising the steps of:

obtaining an electrode assembly;

acquiring data information of a pre-packaging process;

setting an identification code on the electrode assembly in the shell, and binding the data information of the pre-packaging process and the identification code of the electrode assembly;

packaging the electrode assembly by the shell, and acquiring data information of a packaging process;

and providing an identification code on the outside of the case, binding data information of the packaging process with the identification code on the outside of the case, and associating the identification code on the outside of the case with the identification code on the electrode assembly inside the case.

10. A method for tracing battery production data according to claim 9,

the manufacturing sequence of the pre-packaging process sequentially comprises the following steps: pole piece coating process, rolling and slitting process, winding process and tab welding process;

or, the manufacturing sequence of the pre-packaging process sequentially comprises the following steps: pole piece coating process, rolling and slitting process, tab welding process and winding process.

Technical Field

The invention relates to the technical field of lithium ion batteries, in particular to a battery, an electric appliance and a method for tracing production data of the battery.

Background

The lithium ion battery is widely applied to the fields of mobile phones, notebook computers, electric tools, street lamp standby power supplies, navigation lights, small household appliances and the like, the application field is very wide, the use scene of the lithium ion battery is increasingly wide along with the continuous development of new energy, and meanwhile, the requirements of various manufacturers on the safety performance of the lithium battery are higher and higher.

In the manufacturing process of the lithium ion battery, the quality of raw materials and the control of each process have a great influence on the quality of the final finished battery. In addition, the number of processes is large in the manufacturing process of the lithium ion battery, and a problem of defects may occur in the manufacturing process of each process. The problem may be caused by failure of the raw material itself supplied from the upstream material supplier, or may be caused by failure of the back-end process or assembly. At present, the lithium battery is mainly traced by a battery cell bar code in the production process, and information such as raw materials forming the battery cell, data information of a pole piece and the like is difficult to accurately and quickly obtain. If the quality of the finally manufactured lithium ion battery is abnormal, there is a great limitation in analysis by some conventional methods. On one hand, the problem of raw materials or the problem of a certain process is difficult to accurately determine, on the other hand, the flow direction of all defective products is difficult to track, and the defective products are intercepted hundreds of percent. Therefore, the difficulty of process and quality control is increased, and the production cost is increased; and the problem of poor quality cannot be solved quickly from the source, and the production efficiency is finally influenced.

Disclosure of Invention

The invention aims to solve the problems that the traceability of a lithium ion battery in the prior art is poor, an abnormal batch is difficult to accurately and quickly lock, and the reason for the abnormality is difficult to find, so that the production efficiency is influenced and the production cost is increased.

In order to solve the above problems, the present invention provides a battery, which includes an electrode assembly and a case, wherein the electrode assembly is packaged inside the case, and identification codes are respectively disposed on the electrode assembly outside the case and inside the case.

Further, the identification code disposed on the exterior of at least one of the housings is associated with the identification code on the electrode assembly on the interior of at least one of the housings.

Furthermore, the electrode assembly comprises pole pieces and diaphragms, the diaphragms are arranged between any two adjacent pole pieces, the pole pieces comprise current collectors and active substance layers, areas provided with the active substance layers on the current collectors are paste coating areas, areas not provided with the active substance layers on the current collectors are empty foil areas, and the edges of the current collectors are also provided with a plurality of groups of convex tab leading-out ends; the pole piece and the diaphragm are wound to form the electrode assembly with a multi-pole-lug structure, and the pole-lug leading-out end is arranged in the shell;

the identification code on the electrode assembly is arranged at the tab leading-out end or the empty foil area at the outermost side of the electrode assembly

Further, the electrode assembly further comprises a tab connected with the tab lead-out end and extending to the outside of the case;

the identification code associated with the tab leading-out end is arranged in the area where the tab extends out of the shell or outside the shell;

or, the region where the tab extends to the outside of the case or the outside of the case is provided with the identification code associated with the empty foil region at the outermost side of the electrode assembly.

Furthermore, the electrode assembly comprises pole pieces and diaphragms, the diaphragms are arranged between any two adjacent pole pieces, the pole pieces comprise current collectors and active substance layers, areas, provided with the active substance layers, of the current collectors are paste coating areas, and areas, not provided with the active substance layers, of the current collectors are empty foil areas; the pole piece and the separator are wound to form the electrode assembly;

the identification code on the electrode assembly is disposed in the empty foil zone at the outermost side of the electrode assembly or the empty foil zone at the innermost side of the electrode assembly.

Further, the electrode assembly further comprises a tab connected with the pasting region and extending to the outside of the case;

the region where the tabs extend to the outside of the case or the outside of the case is provided with the identification code associated with the empty foil region on the outermost side of the electrode assembly;

or, the region where the tab extends to the outside of the case or the outside of the case is provided with the identification code associated with the empty foil region at the innermost side of the electrode assembly.

Further, the identification code on the shell is a bar code, and the identification code on the electrode assembly is a two-dimensional code.

According to the battery, the identification codes are arranged on the electrode assembly inside the shell and outside the shell, so that the electrode assembly and the shell have traceability, the data information of each step in the electrode assembly manufacturing process and the data information of each step in the battery manufactured by packaging the electrode assembly can be quickly acquired by taking the identification codes as the inlets for acquiring the information, the data information of the electrode assembly and the data information of the battery manufactured by packaging the electrode assembly can be graded and traced, the tracing accuracy is high, the abnormal batch can be quickly and accurately locked, the abnormal reason can be searched, the production management of enterprises is facilitated, convenience is brought to the inspection and tracing of a production line, the production efficiency can be improved, and the production cost can be reduced.

The invention also provides an electric appliance comprising the battery.

The beneficial effects of the electric appliance are the same as those of the battery, and are not described again.

The invention also provides a battery production data tracing method, which is based on the battery and comprises the following steps:

obtaining an electrode assembly;

acquiring data information of a pre-packaging process;

setting an identification code on the electrode assembly in the shell, and binding the data information of the pre-packaging process and the identification code of the electrode assembly;

packaging the electrode assembly by the shell, and acquiring data information of a packaging process;

and providing an identification code on the outside of the case, binding data information of the packaging process with the identification code on the outside of the case, and associating the identification code on the outside of the case with the identification code on the electrode assembly inside the case.

Further, the manufacturing sequence of the pre-packaging process sequentially comprises: pole piece coating process, rolling and slitting process, winding process and tab welding process;

or, the manufacturing sequence of the pre-packaging process sequentially comprises the following steps: pole piece coating process, rolling and slitting process, tab welding process and winding process.

According to the method for tracing the battery production data, the data information in the processes before the packaging of the electrode assembly (including the steps of the manufacturing process of the pole piece and the manufacturing process of the electrode assembly) and in the packaging process is obtained, the binding relationship of the data information is sequentially established according to the manufacturing sequence, the data information is input to the server matched with the identification code, and the identification code is used as an inlet for obtaining the data information, so that the data information in the whole manufacturing process of each battery can be accurately traced, and the raw material quality and the processing process information of each battery can be mastered; the tracing method can realize transparency and datamation of material data in the production process, can realize reverse tracing of the material, and can quickly and accurately determine abnormal information when the raw material batch is abnormal so as to reduce loss to the maximum extent.

Drawings

Fig. 1 is a schematic structural diagram of a pole piece of a first multi-tab winding (first MTW) structure in an embodiment of the present invention, wherein fig. 1(a) is a schematic structural diagram of a pole piece of the first MTW structure; fig. 1(b) is a schematic structural view of the current collector unit after slitting;

fig. 2 is a schematic structural diagram of a pole piece of a second multi-tab winding (second MTW) structure according to an embodiment of the present invention, wherein fig. 2(a) is a schematic structural diagram of a pole piece of the second MTW structure; fig. 2(b) is a schematic structural view of the current collector unit after slitting;

fig. 3 is a schematic structural diagram of a pole piece of a conventional structure in an embodiment of the present invention, wherein fig. 3(a) is a schematic structural diagram of a pole piece of a conventional structure; fig. 3(b) is a schematic structural view of the current collector unit after slitting;

FIG. 4 is a schematic diagram of a method for manufacturing a battery using a first MTW structure of a pole piece according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a method for manufacturing a battery using a second MTW structure according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a method of manufacturing a battery using a conventional pole piece configuration in accordance with an embodiment of the present invention;

fig. 7 is a schematic view of another method for manufacturing a battery by using a pole piece of a conventional structure in the embodiment of the invention.

Description of reference numerals:

1-pasting area; 2-empty foil areas; 3-an identification code; 4-leading-out end of tab;

21-a first empty foil area; 22-second empty foil area.

Detailed Description

In the manufacturing process of lithium ion batteries, the quality of raw materials and the control of various processes have a great influence on the quality of the final finished battery. In addition, the number of processes is large in the manufacturing process of the lithium ion battery, and a problem of defects may occur in the manufacturing process of each process. The problem may be caused by failure of the raw material itself supplied from the upstream material supplier, or may be caused by failure of the back-end process or assembly. At present, the tracing is mainly carried out through a cell bar code in the production process of the lithium battery, and the raw materials forming the cell and the data information of the positive and negative pole pieces are difficult to accurately and quickly obtain. If the quality of the finally manufactured lithium ion battery is abnormal, there is a great limitation in analysis by some conventional methods. On one hand, the problem of raw materials or the problem of a certain process is difficult to accurately determine, on the other hand, the flow direction of all defective products is difficult to track, and the defective products are intercepted hundreds of percent. Therefore, the difficulty of process and quality control is increased, and the production cost is increased; and the problem of poor quality cannot be solved quickly from the source, and the production efficiency is finally influenced.

Although the cell bar code is adopted for tracing in the manufacturing process of the lithium ion battery at present, the cell bar code is sprayed on the shell in the packaging process, data from the winding to the packaging process is traced through the winding batch number, and is only linked according to the winding batch number or the cell bar code, so that the one-to-one accurate tracing of information such as a pole piece, a winding core, raw materials, process parameters, equipment parameters and the like in the manufacturing process cannot be realized, the tracing accuracy of the winding batch number on the pole piece in the previous process is poor, and the abnormal batch is difficult to lock quickly to find the abnormal reason.

In order to solve the above technical problems, embodiments of the present invention provide a battery, an electrical appliance, and a method for tracing battery production data, in which at least one set of associated identification codes is arranged outside a battery case and on an electrode assembly, so that the battery has traceability, and data information in each step of a battery manufacturing process can be quickly acquired by using the identification codes as an entry for acquiring information, thereby accurately and quickly locking an abnormal batch and searching for an abnormal reason.

The technical solutions in the embodiments of the present application will be described in detail and clearly with reference to the accompanying drawings. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Further, in the description of the present invention, "at least one" means one or more unless specifically limited otherwise.

In the description of the embodiments of the present application, the description of the term "some preferred embodiments" means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one preferred embodiment or preferred example of the present invention. Throughout this specification, the schematic representations of the terms used above do not necessarily refer to the same implementation or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Referring to fig. 1 to 3, the present invention provides a pole piece, which includes a current collector and an active material layer, wherein an area of the current collector on which the active material layer is disposed is a paste applying area 1, an area of the pole piece on which the active material layer is not disposed is a blank foil area 2, and at least one identification code 3 is disposed on the blank foil area 2; the active material layer comprises a positive active material layer and a negative active material layer, the positive active material layer is arranged on the current collector to form a positive plate, and the negative active material layer is arranged on the current collector to form a negative plate.

Referring to fig. 1-2, a plurality of paste applying areas 1 and a plurality of empty foil areas 2 are arranged on the current collector, the paste applying areas 1 and the empty foil areas 2 are alternately arranged, each empty foil area 2 includes a first empty foil area 21 and a second empty foil area 22, a first empty foil area 21 is arranged between any two paste applying areas 1 adjacent to each other along the length direction (y-axis direction in fig. 1) of the current collector, a second empty foil area 22 is arranged between any two paste applying areas 1 adjacent to each other along the width direction (x-axis direction in fig. 1) of the current collector, the first empty foil area 21, the second empty foil area 22 and the paste applying areas 1 form a zebra stripe-shaped structure, and the first and second empty foil areas 21 and 22 separate the plurality of pasted areas 1 to form a plurality of current collector units (areas within dotted lines in fig. 1(a) and fig. 2 (a)), each current collector unit comprising one pasted area 1 and first and second empty foil areas 21 and 22 disposed around the periphery of the outside of the pasted area 1; two identification codes 3 are arranged on the first or second empty foil area 21, 22 of each current collector unit.

Referring to fig. 1(a), each current collector unit is provided with two identification code coatings 3, the two identification code coatings 3 are respectively disposed at one end of first empty foil areas 21 on the upper and lower sides of a paste application area 1, and the two identification code coatings 3 are disposed along the width direction of the current collector in a staggered manner, that is, two identification code coatings 3 are respectively disposed on two first empty foil areas 21 on the upper and lower ends of the paste application area 1, one identification code coating 3 is disposed at the left end of the first empty foil area 21, and the other identification code coating 3 is disposed at the right end of the first empty foil area 21.

In order to improve the utilization rate of raw materials, reduce the preparation cost of pole piece, each current collector unit is continuous, under this condition, be provided with two identification codes 3 on same first empty foil district 21, in order to guarantee the current collector unit and cut the back, all be provided with two identification codes 3 on every current collector unit, and improve the utilization ratio of raw materials, two identification codes 3 on same first empty foil district 21 are along the length direction dislocation set of mass flow body, and two identification codes 3 set up respectively at first empty foil district 21 along the width direction's of mass flow body both ends, both ends about first empty foil district 21 promptly.

Referring to fig. 1(b), coating a positive electrode active material layer or a negative electrode active material layer on a paste coating area 1, laser etching or printing or spraying identification codes 3 at corresponding positions of a first empty foil area 21, cutting according to the same length and width to form a plurality of current collector units, respectively cutting two first empty foil areas 21 of each current collector unit by laser according to a preset shape to form a plurality of tab leading-out ends 4 protruding out of the paste coating area 1, wherein two identification codes 3 are respectively positioned on the tab leading-out ends 4 at the upper end and the lower end, one identification code 3 is arranged on the tab leading-out end 4 at the left end, the other identification code 3 is arranged on the tab leading-out end 4 at the right end, and die cutting is performed on the current collector units along the central line of the current collector units (the position of a dotted line in fig. 1 b) to form two pole pieces with a plurality of tab leading-out ends 4, and the tab leading-out end 4 at the left end or the right end of the two pole pieces is provided with an identification code 3, so that a positive pole piece or a negative pole piece is obtained, the positive pole piece and the negative pole piece have the same structure, but the polarities of the active material layers coated on the positive pole piece and the negative pole piece are opposite. For convenience of description, the pole piece having this structure will be referred to as a pole piece of a first multi-tab winding (first MTW for short) structure.

It should be noted that, in the present embodiment, the preset shape is not further limited, and those skilled in the art can adjust the preset shape according to actual situations.

Referring to fig. 2(a), each current collector unit is provided with two identification codes 3, the two identification codes 3 are respectively arranged at one end of the second empty foil area 22 on the left and right sides of the paste applying area 1, and the two identification codes 3 are arranged along the length direction of the current collector in a staggered manner, that is, two second empty foil areas 22 on the left and right sides of the paste applying area 1 are respectively provided with one identification code 3, one identification code 3 is arranged at the upper end of the second empty foil area 22, and the other identification code 3 is arranged at the lower end of the second empty foil area 22.

In order to improve the utilization ratio of raw materials, reduce the preparation cost of pole piece, each current collector unit is continuous, be provided with two identification codes 3 on the empty foil district 22 of same second, in order to guarantee the current collector unit and cut the back, all be provided with two identification codes 3 on every current collector unit, and improve the utilization ratio of raw materials, two identification codes 3 on the empty foil district 22 of same second are along the length direction dislocation set of mass flow body, and two identification codes 3 set up respectively at the empty foil district 22 of second along the length direction's of mass flow body both ends, the upper and lower both ends in the empty foil district 22 of second promptly.

Referring to fig. 2(b), coating a positive electrode active material layer or a negative electrode active material layer on the paste coating area 1, laser etching or printing or spraying an identification code 3 at a corresponding position of a second empty foil area 22, cutting according to the same length and width to form a plurality of current collector units, respectively cutting two first empty foil areas 21 of each current collector unit by laser according to a preset shape to form a plurality of tab leading-out ends 4 protruding from the paste coating area 1, respectively positioning two identification codes 3 on the second empty foil areas 22 at the left and right ends, respectively, wherein one identification code 3 is arranged on the second empty foil area 22 at the left end, the other identification code 3 is arranged on the second empty foil area 22 at the right end, and die-cutting is performed on the current collector units along the central line of the current collector units (the position of the dotted line in fig. 2 b) to form two pole pieces with a plurality of tab leading-out ends 4, and the second empty foil area 22 at the left end or the right end of the two pole pieces is provided with the identification code 3, so that the positive pole piece or the negative pole piece is obtained, the positive pole piece and the negative pole piece have the same structure, but the polarities of the active material layers coated on the positive pole piece and the negative pole piece are opposite. For convenience of description, the pole piece having this structure is referred to as a pole piece of a second multi-tab winding (abbreviated as second MTW) structure.

Referring to fig. 3(a), the current collector includes a plurality of paste applying regions 1 and a plurality of empty foil regions 2, the paste applying regions 1 and the empty foil regions 2 are alternately disposed, that is, an empty foil region 2 is disposed between any two adjacent paste applying regions 1 along the width direction of the current collector, each empty foil region 2 is provided with a plurality of identification codes 3 along the length direction of the current collector, each identification code 3 separates each paste applying region 1 to form a plurality of current collector units (regions in the dotted line in fig. 3 (a)), each current collector unit includes one paste applying region 1 and an empty foil region 2 disposed at one end of the paste applying region 1, and the empty foil region 2 is provided with one identification code 3. For convenience of description, the pole piece having this structure is simply referred to as a pole piece of a conventional structure.

In order to facilitate the mass production of the pole pieces, two identification codes 3 which are arbitrarily adjacent along the width direction of the current collector are symmetrically arranged at two ends of the paste coating area 1.

And (b) as shown in fig. 3, coating a positive electrode active material layer or a negative electrode active material layer on the paste coating area 1, performing laser etching or printing or spraying an identification code 3 on a corresponding position of the empty foil area 2, cutting the pole piece according to the same length and width to form a plurality of current collector units, and arranging the identification code 3 on the empty foil area 2 at one end of the paste coating area 1 of each current collector unit to obtain a positive plate or a negative plate, wherein the positive plate and the negative plate have the same structure, but the polarities of the active material layers coated on the positive plate and the negative plate are opposite. For convenience of description, the pole piece having this structure is referred to as a pole piece of a conventional structure.

The embodiment also provides an electrode assembly, which includes a positive plate, a negative plate and a diaphragm (neither labeled in the figures) arranged between the positive plate and the negative plate, wherein the polarities of the positive plate and the negative plate are opposite, and the positive plate and the negative plate are formed by cutting the three current collector units, that is, active material layers with opposite polarities are respectively coated on paste coating areas of the current collectors to obtain three current collector units with different structures, and the positive plate and the negative plate are obtained after cutting the current collector units; and winding the positive plate, the negative plate and the diaphragm to form the battery cell.

The manufacturing process of the electrode assembly and the battery made of the electrode sheets will be described in detail with reference to fig. 4 to 7.

Referring to fig. 4, when the positive electrode sheet and the negative electrode sheet are electrode sheets of the first MTW structure, the positive electrode sheet, the negative electrode sheet and the separator are wound to form an electrode assembly, and after winding, the tab leading-out terminals 4 on the positive electrode sheet and the negative electrode sheet are overlapped to form an electrode assembly having a multi-tab structure; and overlapping the tab leading-out ends 4, positioning the identification codes 3 on the positive plate and the negative plate on the tab leading-out end 4 on the outermost side, welding tabs on the two tab leading-out ends 4 of the electrode assembly, packaging the electrode assembly in a shell to obtain the battery, and extending the tabs to the area outside the shell. The shell is also provided with an identification code 3, and data recorded by the identification code 3 on the shell and data recorded by the identification code 3 on the tab leading-out end 4 of the electrode assembly are associated and bound together, or data recorded by the identification code 3 on the tab leading-out end 4 is transferred to the identification code 3 of the shell.

After welding the tabs, the identification codes 3 on the tab leading-out ends 4 are covered by the tabs, so that the electrode assembly manufacturing process is not convenient to trace back, the electrode assembly manufacturing process is convenient to trace back, various information of the electrode assembly is obtained, and before welding the tabs, the method also comprises the steps of setting the identification codes 3 which are the same as those on the two tab leading-out ends 4 on the positive and negative tabs or transferring data recorded by the identification codes on the identification codes 3 to the positive and negative tabs. After the electrode assembly is packaged, data recorded by the identification code 3 on the case and data recorded by the identification code 3 on the tab are associated and bound together, or data recorded by the identification code 3 on the tab is transferred to the identification code 3 on the case.

Referring to fig. 5, when the positive electrode sheet and the negative electrode sheet are electrode sheets of the second MTW structure, the positive electrode sheet, the negative electrode sheet and the separator are wound to form an electrode assembly, and after winding, the tab leading-out terminals 4 on the positive electrode sheet and the negative electrode sheet are overlapped to form an electrode assembly having a multi-tab structure; and the identification codes 3 on the positive plate and the negative plate are positioned on a hollow foil area outside the electrode assembly, tabs are welded on two tab leading-out ends 4 of the electrode assembly, the electrode assembly is packaged in the shell to obtain the battery, and the tabs extend to the area outside the shell. The housing is also provided with an identification code coating 3, and data recorded by the identification code 3 on the empty foil area outside the electrode assembly is transferred to the identification code 3 of the housing. After the electrode assembly is packaged, the identification code 3 on the empty foil area outside the electrode assembly is packaged in the shell, so that the electrode assembly manufacturing process is inconvenient to trace, the electrode assembly manufacturing process is convenient to trace, various information of the electrode assembly is acquired, and after the electrode assembly is packaged, data recorded by the identification code 3 on the empty foil area outside the electrode assembly is transferred to the identification code 3 of the shell.

When the positive electrode sheet and the negative electrode sheet are electrode sheets of conventional structures, as shown in fig. 6 to 7, the electrode sheets are wound to form an electrode assembly in two ways, specifically as follows:

as shown in fig. 6, since the pole piece has no tab, in the process of manufacturing the electrode assembly, the tab needs to be welded on the pole piece, and the tab is also provided with the identification code 3, that is: firstly, respectively welding lugs at one ends, close to the empty foil area 2, of the positive plate and the negative plate, then winding the positive plate, the negative plate and the diaphragm to form an electrode assembly, after winding, locating identification codes 3 on the positive plate and the negative plate on the empty foil area inside the electrode assembly, packaging the electrode assembly in a shell to obtain the battery, wherein one end of each lug is connected with the paste coating area 1, and the other end of each lug extends to the area outside the shell. The shell is also provided with an identification code 3, and data recorded by the identification code 3 on the shell and data recorded by the identification code 3 on the lug are associated and bound together, or data recorded by the identification code 3 on the lug is transferred to the identification code 3 of the shell.

The battery cell wound by the mode is characterized in that the identification code 3 is positioned on the empty foil area inside the electrode assembly and is wound inside the electrode assembly, so that the electrode assembly manufacturing process is not convenient to trace back, the electrode assembly manufacturing process is convenient to trace back, various information of the electrode assembly is acquired, after the electrode lugs are welded and before the electrode assembly is wound, the identification code 3 which is the same as that on the empty foil area 2 of the positive plate and the negative plate is arranged on the positive electrode lug and the negative electrode lug, or data recorded by the identification code on the identification code 3 of the empty foil area 2 is transferred to the positive electrode lug and the negative electrode lug. After the electrode assembly is packaged, data recorded by the identification code 3 on the case and data recorded by the identification code 3 on the tab are associated and bound together, or data recorded by the identification code 3 on the tab is transferred to the identification code 3 on the case.

As shown in connection with fig. 7, since the pole pieces of this structure do not have tabs, it is necessary to weld tabs on the pole pieces during the process of manufacturing the electrode assembly, that is: the method comprises the steps of firstly welding lugs at one ends of a positive plate and a negative plate far away from an empty foil area 2, then winding the positive plate, the negative plate and a diaphragm to form an electrode assembly, after winding, locating identification codes 3 on the positive plate and the negative plate on the empty foil area outside the electrode assembly, packaging the electrode assembly in a shell to obtain the battery, wherein one end of each lug is connected with a paste coating area 1, and the other end of each lug extends to an area outside the shell. The identification code 3 is also arranged on the shell, and data recorded by the identification code 3 on the empty foil area outside the electrode assembly is transferred to the identification code 3 of the shell.

In the electrode assembly wound in the mode, the identification code 3 is located on the empty foil area outside the electrode assembly and is packaged in the shell in the subsequent packaging process, so that the electrode assembly manufacturing process is inconvenient to trace, the electrode assembly manufacturing process is convenient to trace, various information of the electrode assembly is acquired, and after the electrode assembly is packaged, data recorded by the identification code 3 on the empty foil area outside the electrode assembly is transferred to the identification code 3 of the shell.

No matter which kind of pole piece is adopted to manufacture the battery, the finally prepared battery is provided with the identification code 3 on the shell and the electrode assembly, the data information of the electrode assembly is bound to the identification code 3 of the pole ear leading-out terminal 4, or the identification code 3 of the empty foil area outside the electrode assembly, or the identification code 3 of the empty foil area inside the electrode assembly, the data information of the shell is bound to the identification code 3 of the shell, and the data information on the identification code 3 of the shell is associated with the data information on the identification code 3 of the electrode assembly.

The battery of this embodiment, through set up the identification code on electrode subassembly and casing, make electrode subassembly and casing all have the traceability, and through regard as the entry of acquireing the information with the identification code, can acquire the data information of each step of electrode subassembly manufacturing process and encapsulate the data information in each step of electrode subassembly manufacturing battery fast, and can grade the data information of electrode subassembly and the data information of encapsulation electrode subassembly manufacturing battery and trace back, the accuracy of tracing back is high, can be fast accurate the locking abnormal batch, look for unusual reason, be favorable to the production management of enterprise, give the investigation of production line, trace back and provide convenience, can improve production efficiency and reduce manufacturing cost.

The identification code 3 is an identification code for recording the data carrier, which is not further limited in this embodiment, and can be selected by those skilled in the art according to the actual situation. In some preferred embodiments, the identification code 3 is a two-dimensional code or a bar code, and the identification code 3 is formed on the electrode assembly or the case 2 by laser etching or printing or spraying. More preferably, the identification code 3 on the electrode assembly is a two-dimensional code, and the identification code 3 on the case is a bar code. From this, on the one hand can reduce the shared space of identification code 3 on the pole piece, reduce the waste of raw materials to reduce manufacturing cost, on the other hand is convenient for distinguish identification code 3 on electrode subassembly and the casing, so that subsequent traceback.

The embodiment also provides a battery production data tracing method, which comprises the following steps:

obtaining an electrode assembly;

acquiring data information of a pre-packaging process;

setting an identification code on an electrode assembly in the shell, and binding data information of a process before packaging with the identification code of the electrode assembly;

packaging the electrode assembly by using a shell, and acquiring data information of a packaging process;

and setting an identification code on the outside of the shell, binding the data information of the packaging process with the identification code on the outside of the shell, and associating the identification code on the outside of the shell with the identification code on the electrode assembly inside the shell.

Because the pole pieces with the two structures (namely the pole piece with the MTW structure and the pole piece with the conventional structure) are respectively the pole piece with the tab and the pole piece without the tab, the process sequence for manufacturing the electrode assembly and the battery by the pole pieces with the two structures is different, and the process for preparing the battery by the pole pieces with the two structures is as follows:

pole piece of MTW structure: and (3) sequentially performing a pole piece coating process, a rolling and slitting process, a winding process, a tab welding process and a packaging process to prepare the battery.

Pole piece of conventional structure: and (3) sequentially performing a pole piece coating process, a rolling and slitting process, a tab welding process, a winding process and a packaging process to prepare the battery. Because the processes for preparing the batteries by the pole pieces with the two structures are different, the method for tracing the production data of the batteries prepared by the pole pieces with the two structures is slightly different, and the method for tracing the production data of the batteries prepared by the pole pieces with the two structures is explained in detail below:

the following describes in detail the method for tracing the production data of the battery obtained by manufacturing the pole piece of the MTW structure: acquiring data information in a pole piece coating process (namely the process of coating a positive active material or a negative active material on a paste coating area of a pole piece), scanning an identification code 3, and uploading the data information in the pole piece coating process to a server;

acquiring data information in a rolling and slitting process (namely the process of rolling and slitting a pole piece into a positive pole piece or a negative pole piece), uploading the data information in the rolling and slitting process to a server, and binding the data information with the data information in the pole piece coating process;

acquiring data information in a winding process (namely the process of winding the positive plate, the negative plate and the diaphragm to form an electrode assembly), uploading the data information in the winding process to a server, and sequentially establishing a binding relationship with the data information in the pole piece coating process and the data information in the rolling and slitting process according to a manufacturing sequence;

acquiring data information in a tab welding process (namely the process of welding a tab on a tab leading-out end 4), uploading the data information in the tab welding process to a server, and sequentially establishing a binding relationship with the data information in a pole piece coating process, the data information in a rolling and slitting process and the data information in a winding process according to a manufacturing sequence to obtain the data information of an electrode assembly;

the method comprises the steps of obtaining data information of a packaging process (namely the process of packaging an electrode assembly in a shell and preparing a battery), uploading the data information of the packaging process to a server, establishing a binding relationship between the data information of the packaging process and the data information of the electrode assembly to obtain the data information of the battery, connecting the data information of the battery to the server and storing the data information of the battery, binding the data information of the battery to an identification code 3 of the shell, and scanning the identification code 3 on the shell to obtain all data information in the whole manufacturing process from a pole piece to the electrode assembly and to the battery.

The following describes in detail the method for tracing the production data of the battery obtained by manufacturing the pole piece with the conventional structure:

acquiring data information in a pole piece coating process (namely the process of coating a positive active material or a negative active material on a paste coating area of a pole piece), scanning an identification code, and uploading the data information in the pole piece coating process to a server;

acquiring data information in a rolling and slitting process (namely the process of rolling and slitting a pole piece into a positive pole piece or a negative pole piece), uploading the data information in the rolling and slitting process to a server, and binding the data information with the data information in the pole piece coating process;

acquiring data information in a tab welding process (namely the process of welding a tab on a positive plate or a negative plate), uploading the data information in the tab welding process to a server, and sequentially establishing a binding relationship with the data information in a pole plate coating process and the data information in a rolling and slitting process according to a manufacturing sequence;

acquiring data information in a winding process (namely a process of winding a positive plate, a negative plate and a diaphragm to form a battery core), uploading the data information in the winding process to a server, and sequentially establishing a binding relationship with the data information in a pole piece coating process, the data information in a rolling and slitting process and the data information in a tab welding process according to a manufacturing sequence to obtain the data information of an electrode assembly;

the method comprises the steps of obtaining data information of a packaging process (namely the process of packaging an electrode assembly in a shell and preparing a battery), uploading the data information of the packaging process to a server, establishing a binding relationship between the data information of the packaging process and the data information of the electrode assembly to obtain the data information of the battery, connecting the data information of the battery to the server and storing the data information of the battery, binding the data information of the battery to an identification code 3 of the shell, and scanning the identification code 3 on the shell to obtain all data information in the whole manufacturing process from a pole piece to the electrode assembly and to the battery.

According to the method for tracing the battery production data, provided by the embodiment of the invention, the data information in the pole piece manufacturing process, the electrode assembly manufacturing process and the battery manufacturing process is obtained, the binding relationship of the data information is sequentially established according to the manufacturing sequence, the data information is input to the server matched with the identification code, and the identification code is used as an inlet for obtaining the data information, so that the data information in the whole manufacturing process of each battery can be accurately traced, and the raw material quality and the processing process information of each battery can be mastered; the tracing method can realize transparency and datamation of material data in the production process, can realize reverse tracing of the material, and can quickly and accurately determine abnormal information when the raw material batch is abnormal so as to reduce loss to the maximum extent.

The positions of the pole piece identification codes of the above several structures, the positions of the identification codes in the manufactured electrode assembly, and the data information transfer process are shown in table 1.

TABLE 1

The specific type of the server is not further limited in the application, a person skilled in the art can select the server according to actual conditions, but in order to perform optimization management on the whole production process, the server in the application can select a manufacturing execution system (called MES system for short), the MES system can perform optimization management on the whole production process of products through information transmission, when a real-time event occurs in a factory, the MES system can respond and report the real-time event in time and guide and process the real-time event and the accurate data, and the rapid response to the state change enables the MES system to reduce the activity without added value in an enterprise and effectively guide the production operation process of the factory, so that the method can improve the timely delivery capacity of the factory, improve the circulation performance of materials and improve the return rate of production.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.