CN112802991B - Battery structure, electronic device and charging method - Google Patents
Battery structure, electronic device and charging method Download PDFInfo
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- CN112802991B CN112802991B CN202011626483.8A CN202011626483A CN112802991B CN 112802991 B CN112802991 B CN 112802991B CN 202011626483 A CN202011626483 A CN 202011626483A CN 112802991 B CN112802991 B CN 112802991B
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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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 embodiment of the application discloses battery structure, electronic equipment and charging method, this battery structure includes the first pair of utmost point ear that is connected with electric core direct electricity and the second pair of utmost point ear that is connected with electric core direct electricity, just first pair of utmost point ear with electric core connected position is different with the second pair of utmost point ear with electric core connected position is different, thereby through giving the electric core different positions input current, improves the inside current distribution uneven phenomenon of electric core shortens the duration of trickle charge stage in the electric core charging process, improves battery structure's charge rate.
Description
Technical Field
The present application relates to the field of charging technologies, and in particular, to a battery structure, an electronic device including the battery structure, and a charging method.
Background
With the development of electronic technology, rapid charging has become a fundamental requirement for lithium ion batteries by users. In the current market, fast charging, whether it be electric automobiles or consumer electronics, such as cell phones, notebooks, bluetooth headsets, etc., has become one of the main selling points. However, the charging speed of the existing battery having the rapid charging function is still to be improved.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present application provide a battery structure to improve the charging rate of a battery.
In order to solve the above problems, the embodiment of the present application provides the following technical solutions:
a battery structure, comprising:
a core comprising at least one electrical cell;
the first pair of lugs are connected with the battery cell and are used for injecting first current into the battery cell;
and the second pair of lugs are connected with the battery cell and are used for injecting second current into the battery cell.
Optionally, the first pair of tabs is electrically connected with a first region of the electric core, the second pair of tabs is electrically connected with a second region of the electric core, and the first region and the second region are different regions of the electric core.
Optionally, the first pair of tabs and the second pair of tabs are located at two opposite sides of the battery cell.
Optionally, the first region is a region of the battery cell near a first end of the battery cell, and the second region is a region of the battery cell near a second end of the battery cell, where the first end is opposite to the second end.
Optionally, the first region is a central region of the electric core, and the second region is a region of the electric core close to the first end of the electric core;
or alternatively, the first and second heat exchangers may be,
the first area is a central area of the battery cell, and the second area is an area, close to the second end of the battery cell, in the battery cell;
wherein the first end and the second end are opposite.
Optionally, the first area is a central area of the battery cell;
the second region comprises a first sub-region and a second sub-region, the first sub-region is a region of the battery cell close to a first end of the battery cell, and the second sub-region is a region of the battery cell close to a second end of the battery cell, wherein the first end and the second end are opposite;
the second pair of tabs includes a third tab and a fourth tab, the third tab being located in the first sub-region, the fourth tab being located in the second sub-region.
An electronic device comprising a battery structure, the battery structure comprising:
a core comprising at least one electrical cell;
the first pair of lugs are connected with the battery cell and are used for injecting first current into the battery cell;
and the second pair of lugs are connected with the battery cell and are used for injecting second current into the battery cell.
A charging method, comprising:
and injecting a first current into the battery cell through a first pair of lugs of the battery cell of the battery structure, and injecting a second current into the battery cell through a second pair of lugs of the battery cell, so that the battery cell is charged by utilizing the first current and the second current.
Optionally, the first current is greater than the second current.
Optionally, the ratio of the first current to the sum of the first current and the second current ranges from 0.55 to 0.80, including the end point value; the ratio of the second current to the sum of the first current and the second current ranges from 0.20 to 0.45, including the end point value.
Compared with the prior art, the technical scheme has the following advantages:
in the technical scheme that this application embodiment provided, battery structure includes the first pair of utmost point ear of being connected with electric core direct electricity and the second pair of utmost point ear of being connected with electric core direct electricity, just first pair of utmost point ear with the position that electric core is connected with the second pair of utmost point ear with the position that electric core is connected is different, thereby through giving the electric core different positions input current improves the inside current distribution uneven phenomenon of electric core shortens the duration of trickle charge stage in the electric core charging process, improves battery structure's charge rate.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an expanded structure of a cell;
FIG. 2 is an equivalent circuit diagram of a cell;
FIG. 3 shows a schematic diagram of current distribution at different locations in a cell;
FIG. 4 is a schematic view of a battery structure according to one embodiment of the present application;
FIG. 5 is a schematic view of a battery structure according to another embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a battery cell in a battery structure according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram of electrical connection between a first pair of tabs and a second pair of tabs and the battery cell in the battery structure according to an embodiment of the present disclosure;
fig. 8 is a schematic diagram of electrical connection between a first pair of tabs and a second pair of tabs and the battery cell in a battery structure according to another embodiment of the present disclosure;
fig. 9 is a schematic diagram of electrical connection between a first pair of tabs and a second pair of tabs and the battery cell in a battery structure according to another embodiment of the present disclosure;
fig. 10 is a schematic diagram of electrical connection between a first pair of tabs and a second pair of tabs and the battery cell in the battery structure according to still another embodiment of the present disclosure;
FIG. 11 is a schematic diagram showing current distribution at different locations in a battery cell according to another embodiment of the present disclosure;
fig. 12 is a schematic view of a battery structure according to another embodiment of the present application;
fig. 13 is a flowchart of a charging method according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Next, the present application will be described in detail with reference to the schematic drawings, wherein the cross-sectional views of the device structure are not to scale for the sake of illustration, and the schematic drawings are merely examples, which should not limit the scope of protection of the present application. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
As described in the background section, the charging speed of the existing battery having the quick charging function is still to be improved. Although the charging current of the battery can be directly increased to improve the charging speed of the battery, the realization of the rapid charging function of the lithium battery is usually carried out at the cost of energy density loss based on the self design and electrochemical principle of the existing lithium ion battery, and the faster the charging speed is, the larger the energy density loss is. The inventors have found that this is mainly due to the following aspects:
1. in the case of rapid charging, the charging current of the battery is often large, so in practical application, in order to reduce the heat generation of the battery and prevent safety accidents such as overheating, the internal resistance of the battery needs to be reduced. The internal resistance of the battery mainly consists of two parts, namely a current collector and a tab of the electrode, and the resistance of the battery. It is known from the law of resistance that decreasing the internal resistance requires decreasing the resistivity of the conductor, increasing the cross-sectional area of the conductor and decreasing the length of the conductor, which applies to current collectors and tabs, and only increases the thickness of the current collector and tab. However, increasing the thickness of the current collector and tab increases the duty ratio of inactive materials inside the battery, resulting in a decrease in the energy density of the battery.
In addition, the resistance of the electrode itself can be achieved by increasing the content of conductive carbon in the electrode material, but increasing the content of the inactive object conductive agent also reduces the energy density of the battery.
Therefore, in order to reduce the internal resistance of the battery and thus reduce the occasional heat generation of the battery, the tab of the battery can be optionally built in the middle of the pole piece, and even more tab designs can be made, so that a larger charging current can be provided for the battery through the parallel connection of the tabs, but the huge energy density loss can be caused.
Such as: the battery is split into two small cells connected in series, the design of multi-tab parallel connection is selected to provide charging current for the battery, in this case, if the battery is selected to use a 4.45V system, in order to support 6C fast charging, the energy density needs to be reduced from 750Wh/l which can be realized to be actually close to 550Wh/l, and the energy density loss is close to 30%.
2. The charge and discharge of lithium batteries are electrochemical reaction behaviors, and improving the charge current of the batteries requires improving the electrochemical reaction speed in the charging process of the batteries. Specifically, for the battery anode, it is necessary that electrons flowing into the battery anode be quickly consumed by the reaction of the anode; in the positive electrode of the battery, electrons flowing out from the positive electrode can be supplemented by electrons generated by the reaction of the positive electrode. Therefore, a common way to increase the reaction rate of the battery is to decrease the coating surface density in the negative electrode sheet, increase the sheet length, and thus increase the reaction sites to increase the electrochemical reaction rate, but this approach increases the composition of the inactive current collector, separator, etc., and decreases the energy density.
3. The charge current of the battery is increased by increasing the transfer of lithium ions in the electrode and electrolyte, supplementing the lithium ion concentration required for the reaction. In order to improve the transfer of lithium ions in electrodes, particularly in negative electrodes, graphite is often designed to be isotropic, and graphite materials also need to be optimized in structure, carbon coating and the like, and the design loses the energy density of graphite, so that the energy density of a battery is reduced.
Moreover, the fast charging current of the notebook battery cell is limited by the temperature of a Temperature Controlled Oscillator (TCO), and if the charging current is too high, for example, exceeds 2C, the generated joule heat is too high, so that when the surface temperature of the battery cell exceeds a threshold value, the temperature protection device TCO is easily triggered, resulting in stopping charging.
Therefore, simply increasing the charging current to increase the charge rate of the battery is not a good choice.
The inventor also researches and discovers that the problem of uneven current distribution exists in the battery cell with the rapid charging function. Moreover, for a cell with thicker thickness and larger length-to-width ratio, the longer the pole piece is, the more uneven the current is distributed in the extending direction of the pole piece. This is because the battery cell is generally composed of two pole pieces and an isolating film located between the two pole pieces, in the extending direction of the pole pieces, different areas of the pole pieces are equivalent to a plurality of resistors connected in series, in the extending direction perpendicular to the pole pieces, the two pole pieces and the isolating film located at the position can be equivalent to a plurality of resistors connected in parallel, so that the battery cell can be equivalent to an equivalent circuit composed of a plurality of resistors, and part of resistors in the equivalent circuit are connected in series, and part of resistors are connected in parallel, as shown in fig. 1 and 2, wherein fig. 1 is a schematic diagram of an unfolding structure of the battery cell, and fig. 2 is an equivalent circuit diagram of the battery cell.
The inventor further researches and found that when a current is inputted to one end of the equivalent circuit through the tab, the current is larger at a place closer to the current input end, and the current is smaller at a place farther from the current input end, so that a phenomenon of larger current distribution unevenness exists inside the battery cell. As shown in fig. 3, fig. 3 shows a schematic diagram of current distribution at different positions in the battery cell, wherein the current at the side close to the current input end in the battery cell is 1.55C, and the current at the side far from the current injection end in the battery cell is 0.99C.
In addition, the battery cell has shallow charge and discharge at a place far away from the current input end, and the non-uniformity can also lead to lithium precipitation of the battery cell and cycle failure.
In view of this, the embodiment of the present application provides a battery structure, as shown in fig. 4, including:
a core comprising at least one cell 10;
a first pair of tabs 20 connected to the battery cell 10, the first pair of tabs 20 being configured to inject a first current into the battery cell;
and a second pair of tabs 30 connected to the cell 10, the second pair of tabs 30 being used to inject a second current into the cell 10.
It should be noted that, the uneven current distribution inside the battery core may cause different SOCs (State of Charge) at different positions of the battery core, and the closer to the current input end, the larger the SOC change rate is, because in the charging process of the battery structure, in order to avoid burning out the battery core with large current, the charging process of the existing battery structure with the fast charging function is divided into a constant current charging stage and a constant voltage charging (also called trickle charging) stage, for example, when the battery core with 4.4V is charged, the constant current charging is usually adopted to Charge to 3.9V, and then the constant voltage charging is adopted to Charge to 4.4V. However, because the length of the cell is longer, when the voltage of the cell near the current input end reaches 3.9V, the voltage of the cell far from the current injection end is 3.9V minus the voltage drop at the two ends, so that the voltage of the cell far from the current injection end is less than 3.9V, the more uneven the current distribution is, the smaller the voltage far from the current injection end is, the longer the time of the subsequent constant voltage charging stage is, and the longer the charging time of the battery structure is.
In addition, when the battery cell is charged, a long trickle charge is required, and the charging time is longer as the charging current in the trickle charge phase is smaller, for example, the trickle charge of 0.05C is longer by 20 to 30 minutes than the trickle charge of 0.1C.
And the battery structure that this application embodiment provided, battery structure includes the first pair of utmost point ear that is connected with electric core direct electricity and the second pair of utmost point ear that is connected with electric core direct electricity, just first pair of utmost point ear with the position that electric core is connected with the second pair of utmost point ear with the position that electric core is connected is different, thereby through giving the electric core different positions input current improves the inside current distribution uneven phenomenon of electric core shortens the duration of electric core charging stage in the electric core charging process, improves battery structure's charge rate.
Based on the above embodiments, in one embodiment of the present application, the core includes one cell, as shown in fig. 4; in another embodiment of the present application, the core includes two electric cells, as shown in fig. 5, and in other embodiments of the present application, the core may further include at least three electric cells, and optionally, in one embodiment of the present application, the core includes four electric cells, but the present application is not limited thereto, and the specific situation is defined.
Specifically, in one embodiment of the present application, as shown in fig. 6, the battery cell includes a first pole piece 11 and a second pole piece 12 that are opposite in a first direction X, and a separation film 13 that is located between the first pole piece 11 and the second pole piece 12. It should be noted that, in this embodiment of the present application, the first area and the second area are arranged along a second direction, as shown in fig. 6 and fig. 7, where the second direction Y is an extending direction of the isolation film (or the first pole piece), that is, a length direction of the isolation film after the battery cell is unfolded, and the second direction Y is perpendicular to the first direction X. In this embodiment of the present application, as shown in fig. 7, the first pair of tabs includes a first tab 21 and a second tab 22, the first tab 21 is electrically connected with the first pole piece 11, the second tab 22 is electrically connected with the second pole piece 12, the second pair of tabs includes a third tab 31 and a fourth tab 32, the third tab 31 is electrically connected with the first pole piece 11, and the fourth tab 32 is electrically connected with the second pole piece 12, so that a first current and a second current are injected into the battery core through the first pair of tabs and the second pair of tabs, respectively.
Optionally, in one embodiment of the present application, as shown in fig. 5 and 7, the first pair of tabs 20 and the second pair of tabs 30 are located on two opposite sides of the battery cell 10, that is, on two opposite sides of the battery cell 10 in a third direction Z, where the third direction is perpendicular to the first direction and the second direction, so that the battery cell is electrically connected to the outside through the first pair of tabs and the second pair of tabs at the same time. However, the present application is not limited thereto, and the present application is not limited thereto as the case may be.
On the basis of any one of the above embodiments, in one embodiment of the present application, the first pair of tabs is electrically connected with the first region of the electric core, the second pair of tabs is electrically connected with the second region of the electric core, and the first region and the second region are different regions of the electric core, so that the connection position of the first pair of tabs and the electric core is different from the connection position of the second pair of tabs and the electric core, and the current distribution non-uniformity phenomenon inside the electric core is improved by inputting current to different positions of the electric core, thereby improving the charging rate of the battery structure.
Specifically, in this embodiment of the present application, when the first pair of tabs injects the first current into the battery core, the first region of the battery core has a first sub-current, the second region of the battery core has a second sub-current, the first region of the battery core is closer to the first pair of tabs, the second region of the battery core is farther from the first pair of tabs, the first sub-current is greater than the second sub-current, and when the second pair of tabs injects the second current into the battery core, the first region of the battery core has a third sub-current, and the second region of the battery core has a fourth sub-current, and the fourth sub-current is greater than the third sub-current, so that when the first pair of tabs and the second pair of tabs all inject the current into the battery core, the uneven current distribution phenomenon inside the battery core is improved, and the charge rate of the battery structure is improved.
Based on the above embodiments, in one embodiment of the present application, the first area is an area of the battery cell near a first end of the battery cell, the second area is an area of the battery cell near a second end of the battery cell, and the first end and the second end are opposite to each other, so that by inputting current to two opposite ends of the battery cell at the same time, an uneven current distribution phenomenon inside the battery cell is improved, and thus, a charging rate of the battery structure is improved without increasing a current value input by the battery cell.
Specifically, in one embodiment of the present application, as shown in fig. 7, the first tab 21 and the second tab 22 are located in the first area, and the third tab 31 and the fourth tab 32 are located in the second area, where the first tab 21 of the first pair of tabs is electrically connected to a portion of the first pole piece 11 near the first end of the battery cell, and the second tab 22 is electrically connected to a portion of the second pole piece 12 near the first end of the battery cell; the third tab 31 of the second pair of tabs is electrically connected with a portion of the first pole piece 11 near the second end of the battery cell, and the fourth tab 32 is electrically connected with a portion of the second pole piece 12 near the second end of the battery cell, so as to improve the phenomenon of uneven current distribution inside the battery cell by inputting current to two opposite ends of the battery cell at the same time, thereby improving the charging rate of the battery structure without increasing the current value input by the battery cell.
In another embodiment of the present application, the first region is a central region of the battery cell, and the second region is a region of the battery cell near the first end of the battery cell, so as to improve the phenomenon of uneven current distribution inside the battery cell by inputting current to the center of the battery cell and the first end of the battery cell at the same time, thereby improving the charging rate of the battery structure without increasing the current value input by the battery cell.
Specifically, in one embodiment of the present application, as shown in fig. 8, the first tab 21 and the second tab 22 are located in the first area, the third tab 31 and the fourth tab 32 are located in the second area, where the first tab 21 of the first pair of tabs is electrically connected to a portion of the first tab 11 corresponding to the central area of the battery cell, the second tab 22 is electrically connected to a portion of the second tab 12 corresponding to the central area of the battery cell, the third tab 31 of the second pair of tabs is electrically connected to a portion of the first tab 11 near the first end of the battery cell, and the fourth tab 32 is electrically connected to a portion of the second tab 12 near the first end of the battery cell, so as to improve the phenomenon of uneven current distribution inside the battery cell by simultaneously inputting current to the center of the battery cell and the first end of the battery cell, thereby improving the charge rate of the battery cell without increasing the current value of the battery cell input.
In yet another embodiment of the present application, the first region is a central region of the battery cell, and the second region is a region of the battery cell near the second end of the battery cell, so as to improve a phenomenon of uneven current distribution inside the battery cell by inputting current to the center of the battery cell and the second end of the battery cell at the same time, thereby improving a charging rate of the battery structure without increasing a current value input by the battery cell.
Specifically, in one embodiment of the present application, as shown in fig. 9, the first tab 21 and the second tab 22 are located in the first area, the third tab 31 and the fourth tab 32 are located in the second area, where the first tab 21 of the first pair of tabs is electrically connected to a portion of the first tab 11 corresponding to the central area of the battery cell, the second tab 22 is electrically connected to a portion of the second tab 12 corresponding to the central area of the battery cell, the third tab 31 of the second pair of tabs is electrically connected to a portion of the first tab 11 near the second end of the battery cell, and the fourth tab 32 is electrically connected to a portion of the second tab 12 near the second end of the battery cell, so as to improve the phenomenon of uneven distribution of current inside the battery cell by simultaneously inputting current to the center of the battery cell and the first end of the battery cell, thereby improving the rate of charge of the battery without increasing the current value of the input of the battery cell.
In still another embodiment of the present application, the first region is a central region of the battery cell, the second region includes a first sub-region and a second sub-region, the first sub-region is a region of the battery cell near the first end of the battery cell, the second sub-region is a region of the battery cell near the second end of the battery cell, and the first end and the second end are opposite to each other, so that the first pair of tabs is used to inject current into the central region of the battery cell, and the second pair of tabs is used to inject current into the first end and the second end of the battery cell, so as to improve the phenomenon of uneven current distribution inside the battery cell, and thus, the charging rate of the battery structure is improved without increasing the current value input by the battery cell.
Specifically, in one embodiment of the present application, as shown in fig. 10, the first tab 21 and the second tab 22 are located in the first area, the third tab 31 is located in the first sub-area, and the fourth tab 32 is located in the second sub-area, where the first tab 21 of the first pair of tabs is electrically connected to a portion of the first tab 11 corresponding to the central area of the battery cell, the second tab 22 is electrically connected to a portion of the second tab 12 corresponding to the central area of the battery cell, the third tab 31 of the second pair of tabs is electrically connected to a portion of the first tab 11 near the first end of the battery cell, and the fourth tab 32 is electrically connected to a portion of the second tab 12 near the second end of the battery cell, so as to inject current into the central area of the battery cell by using the first pair of tabs, and improve current distribution of the battery cell under the conditions of the first end and the second end of the second pair of tabs, thereby improving current distribution of the battery cell, and increasing current input rate of the battery cell under the conditions.
As shown in fig. 11, fig. 11 shows a schematic diagram of current distribution inside the battery cell when the battery structure provided in the embodiment of the present application is used for 3C fast charging, and as can be seen from fig. 11, in the battery structure provided in the embodiment of the present application, during charging, current distribution inside the battery cell is relatively uniform, so that the charging rate of the battery structure can be greatly improved.
It should be noted that, according to the battery structure provided in the embodiment of the present application, on the basis of improving the charging rate of the battery structure, the energy density loss is smaller, and when in specific manufacturing, as shown in fig. 12, only one circuit board (40 such as a PCB board) needs to be added to another section of the battery core to weld the auxiliary tab (i.e. the second pair of tabs), so that the occupied space is smaller, which is approximately 4mm. It should be noted that, when the battery structure provided by the embodiment of the application realizes 3C-6C fast charging, only 10% of energy density is lost, and compared with a method for directly increasing charging current to increase charging rate, the energy density loss is greatly reduced.
Moreover, in the battery structure provided by the embodiment of the application, the first pair of tabs and the second pair of tabs are utilized to charge the battery core together, and the second pair of tabs (such as auxiliary tabs) can be utilized to share the current born on the first pair of tabs (such as main tabs), so that the situation that the main tabs lead to excessive current to cause overheating and turn out TCO is avoided, and the charging is stopped.
In addition, in the charging process of the battery structure provided by the embodiment of the application, the current distribution inside the battery cell is uniform, so that the heat distribution inside the battery cell is balanced, the problem that the aging of local areas inside the battery cell is accelerated due to overhigh temperature is avoided, the extension of the cycle life of the battery structure is facilitated, and the service life of the battery structure is prolonged.
Accordingly, the embodiment of the application also provides an electronic device, which comprises a battery structure, wherein the battery structure comprises: a core comprising at least one electrical cell; the first pair of lugs are connected with the battery cell and are used for injecting first current into the battery cell; and the second pair of lugs are connected with the battery cell and are used for injecting second current into the battery cell.
It should be noted that, in the embodiments of the present application, the battery structure may be a battery structure provided in any of the embodiments of the present application, and since the specific content of the battery structure is described in each of the embodiments, the description is omitted herein.
In addition, the embodiment of the application also provides a charging method which is applied to the charging structure provided by any one of the embodiments. Specifically, the charging method includes: and injecting a first current into the battery cell through a first pair of lugs of the battery cell of the battery structure, and injecting a second current into the battery cell through a second pair of lugs of the battery cell, so that the battery cell is charged by utilizing the first current and the second current.
Optionally, on the basis of the foregoing embodiments, in one embodiment of the present application, the first current is greater than the second current, but the present application is not limited thereto, and in other embodiments of the present application, the first current may be equal to the second current or less than the second current, where appropriate.
The charging method provided in the embodiment of the present application will be described below by taking the example that the first current is greater than the second current.
Specifically, in one embodiment of the present application, the ratio of the first current to the sum of the first current and the second current ranges from 0.55 to 0.80, including the end point value, the ratio of the second current to the sum of the first current and the second current ranges from 0.20 to 0.45, including the end point value, and the sum of the first current and the second current is recorded as the third current, and in this embodiment, the ratio of the first current to the third current ranges from 0.55 to 0.80, including the end point value, and the ratio of the second current to the third current ranges from 0.20 to 0.45, including the end point value, but the present application is not limited thereto, and is specifically determined according to circumstances.
Optionally, in an embodiment of the present application, a ratio of the first current to the second current is 2:1, for example, when the charging current of the battery cell is 3A, the first current is 2A, and the second current is 1A, so that the charging power consumption of the battery cell is reduced on the basis of improving the phenomenon of uneven current distribution in the battery cell by injecting the current into the battery cell by using the second pair of tabs, which is not limited in this application, and the present application is specifically defined as the case may be.
The charging process of the charging method for 3C fast charging according to the embodiment of the present application will be described below with reference to a specific embodiment. In an embodiment of the present application, as shown in fig. 13, the charging method includes:
s1: dividing 3C current into two paths, injecting 2.0C current into the battery cell through a first pair of lugs, injecting 1.0C current into the battery cell through a second pair of lugs, and charging the battery cell, so that the main lugs bear the 2.0C current, and the auxiliary lugs bear the 1.0C current until the voltage of the battery cell reaches 4.2V;
s2: after the battery cell is charged to 4.2V, the first pair of lugs are used for injecting 0.67C current into the battery cell, the second pair of lugs are used for injecting 0.33 current into the battery cell, and the battery cell is continuously charged, so that the main lugs bear 0.67C current, and the auxiliary lugs bear 0.33C current until the voltage of the battery cell reaches 4.4V;
s3: after charging the cell to 4.4V, trickle charging (i.e., constant voltage charging) to an injection current of 0.2C through the first pair of tabs and trickle charging (i.e., constant voltage charging) to an injection current of 0.1C through the second pair of tabs until the charging is completed.
In summary, the battery structure, the electronic device and the charging method provided by the embodiment of the application can reduce the energy density loss of the battery structure and prolong the service life of the battery structure on the basis of improving the charging rate of the battery structure.
In the description, each part is described in a parallel and progressive mode, and each part is mainly described as a difference with other parts, and all parts are identical and similar to each other.
The features described in the various embodiments of the present disclosure may be interchanged or combined with one another in the description to enable those skilled in the art to make or use the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A battery structure, comprising:
a core comprising at least one electrical cell;
the first pair of lugs are connected with the battery cell and are used for injecting first current into the battery cell;
the second pair of lugs are connected with the battery cell and are used for injecting second current into the battery cell; the first pair of tabs and the second pair of tabs can simultaneously inject current into the battery cell;
the first pair of tabs and the second pair of tabs are main tabs and auxiliary tabs, and the main tabs and the auxiliary tabs can be adapted to different currents.
2. The battery structure of claim 1, the first pair of tabs being electrically connected with a first region of the cell, the second pair of tabs being electrically connected with a second region of the cell, the first region and the second region being different regions of the cell.
3. The battery structure of claim 1, the first and second pairs of tabs being located on opposite sides of the cell.
4. The battery structure of claim 2, the first region being a region of the cell proximate a first end of the cell, the second region being a region of the cell proximate a second end of the cell, the first end and the second end being opposite.
5. The battery structure of claim 2, the first region being a central region of the cell and the second region being a region of the cell proximate to a first end of the cell;
or alternatively, the first and second heat exchangers may be,
the first area is a central area of the battery cell, and the second area is an area, close to the second end of the battery cell, in the battery cell;
wherein the first end and the second end are opposite.
6. The battery structure of claim 2, the first region being a central region of the cell;
the second region comprises a first sub-region and a second sub-region, the first sub-region is a region of the battery cell close to a first end of the battery cell, and the second sub-region is a region of the battery cell close to a second end of the battery cell, wherein the first end and the second end are opposite;
the second pair of tabs includes a third tab and a fourth tab, the third tab being located in the first sub-region, the fourth tab being located in the second sub-region.
7. An electronic device comprising a battery structure, the battery structure comprising:
a core comprising at least one electrical cell;
the first pair of lugs are connected with the battery cell and are used for injecting first current into the battery cell;
the second pair of lugs are connected with the battery cell and are used for injecting second current into the battery cell; the first pair of tabs and the second pair of tabs can simultaneously inject current into the battery cell;
the first pair of tabs and the second pair of tabs are main tabs and auxiliary tabs, and the main tabs and the auxiliary tabs can be adapted to different currents.
8. A charging method, comprising:
injecting a first current into the battery cell through a first pair of lugs of the battery cell of the battery structure, and injecting a second current into the battery cell through a second pair of lugs of the battery cell so as to charge the battery cell by utilizing the first current and the second current;
the first pair of tabs and the second pair of tabs can simultaneously inject current into the battery cell;
the first pair of tabs and the second pair of tabs are main tabs and auxiliary tabs, and the main tabs and the auxiliary tabs can be adapted to different currents.
9. The charging method of claim 8, the first current being greater than the second current.
10. The charging method according to claim 9, wherein a ratio of the first current to a sum of the first current and the second current ranges from 0.55 to 0.80, including an end point value; the ratio of the second current to the sum of the first current and the second current ranges from 0.20 to 0.45, including the end point value.
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| TW201230598A (en) * | 2010-04-26 | 2012-07-16 | Proterra Inc | Fast charge stations for electric vehicles in areas with limited power availability |
| CN202737499U (en) * | 2012-06-20 | 2013-02-13 | 北京壹人壹本信息科技有限公司 | Portable electronic device |
| CN104953647B (en) * | 2015-05-27 | 2018-09-25 | 小米科技有限责任公司 | Mobile terminal and its charging method |
| CN108091808B (en) * | 2016-11-23 | 2022-07-01 | 北京小米移动软件有限公司 | Battery, equipment, charging control method and device |
| CN210576184U (en) * | 2019-10-31 | 2020-05-19 | 恒大新能源技术(深圳)有限公司 | Lithium ion battery |
| CN111628554B (en) * | 2020-06-30 | 2022-02-18 | 联想(北京)有限公司 | Electronic equipment and charging method |
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