CN113363678A - Battery core, battery and preparation method thereof - Google Patents
Battery core, battery and preparation method thereof Download PDFInfo
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- CN113363678A CN113363678A CN202110627100.7A CN202110627100A CN113363678A CN 113363678 A CN113363678 A CN 113363678A CN 202110627100 A CN202110627100 A CN 202110627100A CN 113363678 A CN113363678 A CN 113363678A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention provides a battery cell, a preparation method thereof and a battery, wherein the battery cell comprises a positive plate, a negative plate, a reserved positive tab, a reserved negative tab, an external positive tab and an external negative tab; the positive plate, the negative plate, the reserved positive tab and the reserved negative tab are all provided with a plurality of plates, each positive plate is connected with the reserved positive tab, each negative plate is connected with the reserved negative tab, and the positive plates and the negative plates are alternately stacked; the reserved positive tab and the external positive tab and the reserved negative tab and the external negative tab are clamped through the positioning parts. The battery cell can effectively avoid the situation that the position of the external tab deviates greatly, and improves the alignment accuracy of the external tab.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery core, a battery and a preparation method thereof.
Background
Compared with the traditional columnar battery, the soft package battery has the biggest characteristic that a polymer wrapping bag is adopted to package the electrode plates, and the electrode plates comprise a positive plate and a negative plate which are oppositely arranged. In order to increase the volumetric specific energy of the battery cell, when the electrode tabs are provided, it is generally necessary to stack the electrode tabs in such a manner that a plurality of positive electrode tabs and a plurality of negative electrode tabs are alternately stacked.
In order to facilitate the conduction of the electrode plates in the electric core and an external circuit, reserved sub-tabs are usually led out of a current collector of each electrode plate in advance, and after a plurality of electrode plates with the same polarity are stacked mutually, the reserved sub-tabs are also aligned and stacked. In the subsequent preparation process, the reserved sub-tabs are electrically connected to the external tab together to be conducted with an external circuit. In the traditional technology, the part of the reserved sub-tabs close to the edge is cut off, then the reserved sub-tabs are welded to the external tabs together in an ultrasonic welding mode by using a certain pressing force, and the reserved sub-tabs and the external tabs are welded together in the welding process to realize electric connection.
However, when a plurality of electrode plates with the same polarity are stacked, the reserved sub-tabs cannot be tightly combined together in a local manner and are in a loose state, even if the reserved sub-tabs are pressed in the welding process, the alignment accuracy between the reserved sub-tabs and the external sub-tabs is not high, and the positions of the reserved sub-tabs and the external sub-tabs are fluctuated to some extent after the welding is finished, so that the precision in the subsequent cell assembling process is influenced, and the problem of poor cell specification consistency is caused.
Disclosure of Invention
Therefore, it is necessary to provide a battery cell capable of improving the alignment accuracy between the reserved tab and the external tab.
According to one embodiment of the invention, the battery cell comprises a positive plate, a negative plate, a reserved positive tab, a reserved negative tab, an external positive tab and an external negative tab;
the positive plate, the negative plate, the reserved positive tab and the reserved negative tab are all provided with a plurality of plates, each positive plate is connected with the reserved positive tab, each negative plate is connected with the reserved negative tab, and the positive plates and the negative plates are alternately stacked;
the reserved positive tab and the external positive tab and the reserved negative tab are connected in a clamping mode through positioning parts correspondingly.
In one embodiment, the positioning component is a positioning bump, the external positive tab and the external negative tab are both provided with the positioning bump, the reserved positive tab is provided with a positioning hole penetrating through each reserved positive tab, the reserved negative tab is provided with a positioning hole penetrating through each reserved negative tab, and the external positive tab and the external negative tab are respectively and correspondingly clamped in the positioning holes of the reserved positive tab and the reserved negative tab through the positioning bumps arranged on the external positive tab and the external negative tab.
In one embodiment, the cross-sectional area of each positioning hole is 0.5mm2～20mm2。
In one embodiment, the cross section of the positioning hole is circular or oval.
In one embodiment, the positioning hole is in interference fit with the positioning lug.
In one embodiment, the number of the positioning holes is multiple, and the number of the positioning bumps is the same as that of the positioning holes.
In one embodiment, the number of the positive plates is more than 20.
In one embodiment, the material of the reserved tab and/or the external tab is selected from aluminum, nickel, aluminum alloy or nickel alloy.
Further, a method for preparing the battery cell in some embodiments includes the following steps:
stacking each reserved positive electrode lug to form a reserved positive electrode lug, stacking each reserved negative electrode lug to form a reserved negative electrode lug, and preparing the positioning holes on the reserved positive electrode lug and the reserved negative electrode lug respectively;
and the positioning lugs on the external positive tab and the external negative tab correspondingly and completely extend into the positioning holes on the reserved positive tab and the reserved negative tab, and the positioning lugs are pressed respectively to deform and clamp the positioning lugs in the corresponding positioning holes.
In one embodiment, the pressure for pressing each positioning bump is 100kgf/cm2～1000kgf/cm2。
In one embodiment, after the positioning hole is prepared, the method further comprises cutting a part of the reserved positive tab located on the side of the positioning hole away from the positive plate and a part of the reserved negative tab located on the side of the positioning hole away from the negative plate.
In one embodiment, the number of the positive plates is more than 20.
Further, a battery includes a battery case and the battery cell according to the above embodiment, and the battery cell is disposed in the battery case.
The reserved sub-tabs and the external tabs are welded usually in an ultrasonic welding mode in the traditional technology, the battery core in the embodiment adopts a mechanical structure mode, the positioning holes and the positioning lugs benefit from the alignment fit relation, each reserved sub-tab can be accurately aligned and connected to the external tabs, and the connection precision between the reserved sub-tabs and the external tabs can be effectively improved. And, the locating hole is used with the collocation of location lug, can be when supplementary accurate counterpoint, will reserve sub-utmost point ear and the external utmost point ear between the corresponding fixed connection of mode through location lug joint, can effectively guarantee to reserve the fastness that combines between sub-utmost point ear and the external utmost point ear under the welded condition not using.
Drawings
FIG. 1 is a front view of an assembly structure composed of an electrode main body and a reserved positive sub-tab and a reserved negative sub-tab;
FIG. 2 is a front view of an assembly structure composed of an electrode main body, a reserved positive tab and a reserved negative tab;
FIG. 3 is a top view of an assembly structure composed of an electrode main body and a punched reserved positive tab and a punched reserved negative tab;
FIG. 4 is an elevation view of a circumscribing positive tab structure;
fig. 5 is a schematic diagram of connection of the reserved positive tab and the reserved negative tab in alignment with the external positive tab and the external negative tab.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. As used herein, "plurality" includes two and more than two items. As used herein, "above a certain number" should be understood to mean a certain number and a range greater than a certain number.
According to one embodiment of the invention, the battery cell comprises a positive plate, a negative plate, a reserved positive tab, a reserved negative tab, an external positive tab and an external negative tab;
the positive plate, the negative plate, the reserved positive tab and the reserved negative tab are all provided with a plurality of plates, each positive plate is connected with the reserved positive tab, each negative plate is connected with the reserved negative tab, and the positive plates and the negative plates are alternately stacked;
the reserved positive tab and the external positive tab and the reserved negative tab and the external negative tab are clamped through the positioning parts.
The positive plates and the negative plates are provided with a plurality of plates, and the positive plates and the negative plates are alternately stacked, so that the difference between the number of the positive plates and the number of the negative plates is within one plate. Specifically, for example, if the number of negative electrode tabs is the same as the number of positive electrode tabs, the stacking manner may be such that the negative electrode tab is placed uppermost and the positive electrode tab is placed lowermost; for another example, if the number of the positive electrode sheets is one more than that of the negative electrode sheets, the stacking manner may be that the positive electrode sheets are placed at the top and the bottom; for example, if the number of negative electrode sheets is larger than that of positive electrode sheets, the negative electrode sheets may be stacked in such a manner that the negative electrode sheets are disposed uppermost and lowermost.
It is understood that in the above embodiment, the positioning component may be a component capable of assisting the engagement between the reserved positive tab and the external positive tab, and may be, for example, a positioning ring disposed on the reserved positive tab. The positioning component can be a positioning lug which is used for realizing positioning by extending into the positioning hole.
In one specific example, the positioning component is a positioning bump, the external positive tab and the external negative tab are both provided with positioning bumps, the reserved positive tab is provided with a positioning hole penetrating through each reserved positive tab, the reserved negative tab is provided with a positioning hole penetrating through each reserved negative tab, and the external positive tab and the external negative tab are respectively correspondingly clamped in the positioning holes of the reserved positive tab and the reserved negative tab through the positioning bumps arranged on the external positive tab and the external negative tab. Taking the reserved positive tab connected to the positive plate as an example, considering that the operation space for reserving the positive tab on the positive plate is limited and a complicated positioning component cannot be arranged, the clamping is realized by adopting the above positioning lug and positioning hole in a matching manner. When the positioning holes are arranged, the reserved positive lug whole body arranged in a stacked mode can be punched from top to bottom only through the punching machine, and the requirement on operation space is not high. Furthermore, the external positive tab is relatively independent from the positive plate, so that the external positive tab with the positioning bump can be directly prepared and formed in a mold. The conditions of the preparation process are similar for the reserved negative electrode lug and the external negative electrode lug.
In one specific example, the cross-sectional area of a single pilot hole is 0.5mm2～20mm2. Controlling the cross-sectional area of a single positioning hole to be 0.5mm2～20mm2On one hand, the precision problem in the actual preparation process can be avoided, and on the other hand, the positioning lug can conveniently stretch into the positioning lug and be clamped. Further, the cross-sectional area of the lug positioning hole is 1mm2～10mm2. Further, the cross-sectional area of the tab positioning hole is 3mm2～8mm2. The positioning lug is matched with the positioning hole, and the 'matching' means that the positioning lug can extend into the positioning hole, and the cross section area of the positioning lug can be the same as that of the positioning hole or slightly smaller than that of the positioning hole so as to extend into the positioning hole; or the positioning hole can be slightly larger than the positioning hole, so that the positioning hole deforms and expands when the positioning hole is inserted into the positioning hole to be tightly connected.
In one specific example, the material of the positioning bump is selected from a metal material or a non-metal material. The non-metallic material may be, for example, a carbon material or a conductive polymer material, among others. The metal material may be, for example, nickel, aluminum, copper, or a nickel alloy, an aluminum alloy, or a copper alloy. The material of location lug is selected from metal material, and metal material can electrically conduct on the one hand, helps keeping reserving the electric connection between utmost point ear and the external utmost point ear, and on the other hand metal material matter is soft and prepare the shaping easily in the mould, can also take place deformation comparatively easily, and after the location lug stretched into the locating hole, the location lug can take place deformation through slight pressure, blockked up the locating hole with the joint.
In one specific example, the positioning hole is in interference fit with the positioning lug.
In one specific example, the cross section of the positioning hole is circular or elliptical, the circular or elliptical cross section is uniform, the circular or elliptical edge is a curve, and the positioning lug is pressed and deformed after extending into the positioning hole to easily form interference fit or excessive fit, so that the reserved tab and the external tab are prevented from being separated. Preferably, the positioning protrusion may be a positioning protrusion with a regular shape, such as a cylindrical or prismatic positioning protrusion, or a pointed cone-shaped or truncated cone-shaped positioning protrusion. In particular, the diameter of the positioning lug can be enlarged from the top end to the bottom end and then reduced, so that the positioning lug can be clamped in the positioning hole after extending into the positioning hole.
In one specific example, in one positioning assembly, the positioning holes are multiple, and the number of the positioning lugs is the same as that of the positioning holes. Further, the quantity of locating hole is 2 ~ 5, and further, the quantity of locating hole is 3.
Further, the invention also provides a preparation method of the battery cell, which comprises the following steps:
stacking each reserved positive electrode lug to form a reserved positive electrode lug, stacking each reserved negative electrode lug to form a reserved negative electrode lug, and preparing the positioning holes on the reserved positive electrode lug and the reserved negative electrode lug respectively;
and the positioning lugs on the external positive tab and the external negative tab correspondingly and completely extend into the positioning holes on the reserved positive tab and the reserved negative tab, and the positioning lugs are pressed respectively to deform and clamp the positioning lugs in the corresponding positioning holes.
In one specific example, the pressing force when pressing each positioning bump is 100kgf to 1000 kgf.
In order to facilitate understanding of the specific preparation process of the battery cell, an embodiment of the present invention further provides a specific preparation method of the battery cell, where the preparation method includes the following steps:
in step S1, a plurality of positive electrode sheets and a plurality of negative electrode sheets are alternately stacked.
For convenience of understanding, please refer to fig. 1, which shows a front view of the cell preparation step S1. The electrode body 110 is formed by alternately stacking a plurality of positive electrode sheets and a plurality of negative electrode sheets. Each positive plate is connected with a reserved positive tab 121 in advance, and each negative plate is connected with a reserved negative tab 131 in advance, so that a plurality of reserved positive tabs 121 with the same number as the positive plates are connected to the electrode main body 110, as shown in the left side of fig. 1; a plurality of reserved negative tabs 131, the number of which is the same as that of the negative plates, are also connected, as shown on the right side of fig. 1.
In one specific example, the number of the positive electrode plates is more than 20; the difference value between the number of the negative electrode plates and the number of the positive electrode plates is 1. In another specific example, the number of the negative electrode tabs is 20 or more.
And step S2, stacking the reserved positive sub-tabs to form reserved positive tabs, and stacking the reserved negative sub-tabs to form reserved negative tabs.
The connection positions of the reserved positive tab 121 on each positive plate are the same, so that when the positive plates are stacked, the reserved positive tabs 121 are also stacked; similarly, the reserved negative tabs 131 are also stacked. Referring to fig. 2, a front view of the cell preparation step S2 is shown. The reserved positive tab 121 is stacked to form a reserved positive tab 120, and the reserved negative tab 131 is stacked to form a reserved negative tab 130. Further, when the reserved positive tab 120 is formed, a plurality of gaps between the reserved positive tabs 121 can be reduced by pressing; when the reserved negative electrode tabs 130 are formed, the gaps among the reserved positive electrode tabs 131 can be reduced by pressing.
And step S3, preparing positioning holes on the reserved positive electrode lug and the reserved negative electrode lug respectively.
Specifically, referring to fig. 3, in order to facilitate understanding of a specific arrangement schematic diagram of the positioning holes, a top view of the cell preparation step S3 is shown. In this step, three positive tab positioning holes 122 are punched on the reserved positive tab 120, the three positive tab positioning holes 122 are arranged side by side and penetrate through each reserved positive tab 121, and the cross section of each positive tab positioning hole 122 is circular. Three negative electrode tab positioning holes 132 which are arranged side by side and penetrate through each reserved negative electrode tab 131 are formed in the reserved negative electrode tabs 130 through a puncher, and the cross sections of the negative electrode tab positioning holes 132 are also circular.
In one specific example, the pre-cut positive tab 120 and the pre-cut negative tab 130 are further included before or after the punching. Taking the positive tab 120 as an example, the inactive area refers to the portion of the positive tab located through the hole 122 away from the end of the electrode body 110.
And step S4, correspondingly extending the positioning lugs on the external positive tab and the external negative tab into the positioning holes on the reserved positive tab and the reserved negative tab, and respectively pressing each positioning lug to deform each positioning lug to be clamped in the corresponding positioning hole.
In one specific example, the pressure when pressing each positioning bump is 100kgf/cm2～1000kgf/cm2。
Specifically, an external positive tab and an external negative tab are provided. Fig. 4 shows a side view of the circumscribing tab 140, with a tab locating tab 141 pre-disposed on the circumscribing tab 140. The positive tab positioning protrusion 141 is cylindrical corresponding to the cylindrical positive tab positioning hole 122, and the height of the positive tab positioning protrusion 141 is longer than the depth of the positive tab positioning hole 122, so that the positive tab positioning protrusion 141 can completely extend into the positive tab positioning hole 122. Similarly, the external negative electrode tab has a structure similar to that between the external positive electrode tabs.
Referring to fig. 5, a schematic diagram of the connection between the external positive tab 140 and the external negative tab and the reserved positive tab 120 and the reserved negative tab 130 is shown. In the example of the positive tab portion, the positive tab positioning protrusion 141 on the external positive tab 140 extends into the positive tab positioning hole 122 on the reserved positive tab 120, and then the positive tab positioning protrusion 141 is pressed along the axial direction of the positive tab positioning hole 122, so that the positive tab positioning protrusion 141 deforms, the top end of the deformed positive tab positioning protrusion 141 becomes shorter and expands or bends to clamp the positive tab positioning hole 122, that is, the external positive tab 140 is connected with the reserved positive tab 120 in a clamping manner through the positive tab positioning protrusion 141.
It is understood that the above-mentioned preparation processes are only specific examples, and the specific preparation processes are not limited to the above-mentioned examples, and the above-mentioned preparation processes do not strictly limit the chronological order of the operations, and the specific order can be set according to the general understanding of the skilled person.
The reserved sub-tabs and the external tabs are welded usually in an ultrasonic welding mode in the traditional technology, the battery core in the embodiment adopts a mechanical structure mode, the positioning holes and the positioning lugs benefit from the alignment fit relation, each reserved sub-tab can be accurately aligned and connected to the external tabs, and the connection precision between the reserved sub-tabs and the external tabs can be effectively improved. And, the locating hole is used with the collocation of location lug, can be when supplementary accurate counterpoint, will reserve sub-utmost point ear and the external utmost point ear between the corresponding fixed connection of mode through location lug joint, can effectively guarantee to reserve the fastness that combines between sub-utmost point ear and the external utmost point ear under the welded condition not using.
The invention further provides a battery, which comprises a battery shell and the battery core of any one of the embodiments, wherein the battery core is arranged in the battery shell.
In one specific example, the battery is further provided with a positive contact and a negative contact, wherein the positive contact is electrically connected to an external positive tab in the battery cell, and the negative contact is electrically connected to an external negative tab of the battery cell.
In order that the invention may be more readily understood and put into practical effect, reference is also made to the following more specific and detailed examples and comparative examples. The embodiments of the present invention and their advantages will also be apparent from the description of specific examples and comparative examples below, and the performance results.
The raw materials used in the following examples are all commercially available without specific reference.
Example 1
(1) And (3) alternately laminating a plurality of positive plates and a plurality of negative plates in sequence, wherein the total number of the positive plates is 30, and the total number of the negative plates is 31.
(2) Laminating reserved positive sub-tabs connected with each positive plate to form reserved positive tabs, pressing to reduce gaps among the reserved positive sub-tabs, and punching three positioning holes which are arranged side by side and penetrate through the reserved positive sub-tabs at preset positions of the reserved positive tabs by using a punching machine; laminating reserved negative tabs connected with the negative plates to form reserved negative tabs, and preparing positioning holes in the reserved negative tabs in the same manner as the manner; wherein, each locating hole is cylindrical hole, and the circular diameter in its bottom surface is 3 mm. And cutting a part of the reserved positive electrode lug and a part of the reserved negative electrode lug between the positioning hole and the outer edge after the punching is finished, wherein the distance from the cutting edge to the electrode main body is 9 mm.
(3) The external positive lug and the external negative lug are provided, the corresponding positions of the external positive lug and the external negative lug are provided with cylindrical positioning convex blocks, the positioning convex blocks of the external positive lug stretch into the positioning holes of the reserved positive lugs, the positioning convex blocks of the external negative lug stretch into the positioning holes of the reserved negative lugs, the positioning convex blocks on the external positive lug and the external negative lug are pressed together, and the top ends of the positioning convex blocks are deformed to clamp the positioning holes.
Comparative example 1
(1) And (3) alternately laminating a plurality of positive plates and a plurality of negative plates in sequence, wherein the total number of the positive plates is 30, and the total number of the negative plates is 31.
(2) Laminating the reserved positive sub-tabs connected with each positive plate to form reserved positive tabs, and reducing gaps among the reserved positive sub-tabs by pressing; and the reserved negative electrode tabs connected with the negative electrode plates are stacked to form reserved negative electrode tabs, and gaps among the reserved positive electrode tabs are reduced by pressing. And a positive electrode lug is reserved on the cutting part and a negative electrode lug is reserved on the cutting part, and the distance between the cutting edge and the electrode main body is 9 mm.
(3) Providing an external positive tab and an external negative tab, correspondingly arranging the external positive tab and the external negative tab under the reserved positive tab and the reserved negative tab, and welding in an ultrasonic welding mode; the width of the ultrasonic welding area is 3mm, and the length of the ultrasonic welding area is 43mm, namely the length of a short edge (an edge parallel to the edge of the electrode main body) of the tab; the welding area was 1mm from the cut edge.
Examples of the experiments
30 cell samples are prepared according to the preparation method of the embodiment 1, 30 cell samples are prepared according to the preparation method of the comparative example 1, the reserved positive electrode lug or the reserved negative electrode lug is selected for inspection, the distance d from the lower end of the short edge of the external electrode lug of all the cell samples to the electrode main body is uniformly tested, and the specific results can be shown in table 1.
TABLE 1
The distance d between the lower end of the short edge of the external tab and the electrode main body can reflect the alignment accuracy of the external tab. Specifically, if the external tab has high alignment accuracy, the fluctuation of the distance d between the lower end of the short side of the external tab and the electrode main body is smaller in the plurality of samples.
As shown in the data of table 1, for example 1, the maximum value of measured d was 22.67mm, the minimum value of measured d was 22.43mm, and the difference between the maximum and minimum values was 0.24mm, i.e., the maximum fluctuation distance at the time of mounting of the external tab was 0.24mm in the plurality of samples. For comparative example 1, the maximum value of measured d was 22.79mm, the minimum value of measured d was 22.31mm, and the difference between the maximum and minimum values was 0.48mm, i.e., the maximum fluctuation distance in the installation of the external tab in the plurality of samples was 0.48 mm.
Through comparison of the data, the maximum fluctuation distance of the external tab in the embodiment 1 is 0.24mm during installation, and the maximum fluctuation distance of the external tab in the comparative example 1 is 0.48mm during installation, which shows that by adopting the preparation method provided by the embodiment of the invention, the position deviation of the external tab in the assembling process of the battery cell can be obviously reduced, and the alignment consistency of the external tab is effectively improved.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An electric core is characterized by comprising a positive plate, a negative plate, a reserved positive tab, a reserved negative tab, an external positive tab and an external negative tab;
the positive plate, the negative plate, the reserved positive tab and the reserved negative tab are all provided with a plurality of plates, each positive plate is connected with the reserved positive tab, each negative plate is connected with the reserved negative tab, and the positive plates and the negative plates are alternately stacked;
the reserved positive tab and the external positive tab and the reserved negative tab are connected in a clamping mode through positioning parts correspondingly.
2. The battery core according to claim 1, wherein the positioning member is a positioning protrusion, the external positive tab and the external negative tab are provided with the positioning protrusion, the reserved positive tab is provided with a positioning hole penetrating through each reserved positive tab, the reserved negative tab is provided with a positioning hole penetrating through each reserved negative tab, and the external positive tab and the external negative tab are correspondingly clamped in the positioning holes of the reserved positive tab and the reserved negative tab respectively through the positioning protrusions provided thereon.
3. The cell of claim 2, wherein the cross-sectional area of a single locating hole is 0.5mm2～20mm2。
4. The cell of claim 2, wherein the positioning hole is circular or elliptical in cross-section.
5. The cell of claim 2, wherein the positioning hole is in an interference fit with the positioning protrusion.
6. The battery cell of claim 2, wherein the positioning hole is multiple, and the number of the positioning projections is the same as that of the positioning holes.
7. The battery cell of any one of claims 1 to 4, wherein the number of positive plates is more than 20.
8. The cell preparation method according to any one of claims 2 to 6, comprising the following steps:
stacking each reserved positive electrode lug to form a reserved positive electrode lug, stacking each reserved negative electrode lug to form a reserved negative electrode lug, and preparing the positioning holes on the reserved positive electrode lug and the reserved negative electrode lug respectively;
and the positioning lugs on the external positive tab and the external negative tab correspondingly and completely extend into the positioning holes on the reserved positive tab and the reserved negative tab, and the positioning lugs are pressed respectively to deform and clamp the positioning lugs in the corresponding positioning holes.
9. The method for preparing a battery cell according to claim 8, wherein the pressure applied to press each positioning bump is 100kgf/cm2～1000kgf/cm2。
10. A battery, comprising a battery housing and the electric core of any one of claims 1 to 7, wherein the electric core is disposed in the battery housing.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950816A (en) * | 2010-09-21 | 2011-01-19 | 奇瑞汽车股份有限公司 | Square power lithium ion battery cell and manufacturing method thereof |
| CN204230364U (en) * | 2014-07-07 | 2015-03-25 | 合肥国轩高科动力能源股份公司 | A kind of multi pole ears winding type lithium ion battery roll core |
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2021
- 2021-06-04 CN CN202110627100.7A patent/CN113363678A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950816A (en) * | 2010-09-21 | 2011-01-19 | 奇瑞汽车股份有限公司 | Square power lithium ion battery cell and manufacturing method thereof |
| CN204230364U (en) * | 2014-07-07 | 2015-03-25 | 合肥国轩高科动力能源股份公司 | A kind of multi pole ears winding type lithium ion battery roll core |
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Application publication date: 20210907 |