WO2017092520A1 - 一种锂离子电池电芯及锂离子电池 - Google Patents
一种锂离子电池电芯及锂离子电池 Download PDFInfo
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- WO2017092520A1 WO2017092520A1 PCT/CN2016/103256 CN2016103256W WO2017092520A1 WO 2017092520 A1 WO2017092520 A1 WO 2017092520A1 CN 2016103256 W CN2016103256 W CN 2016103256W WO 2017092520 A1 WO2017092520 A1 WO 2017092520A1
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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
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0459—Cells or batteries with folded separator between plate-like electrodes
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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
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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
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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
- H01M50/534—Electrode connections inside a battery casing characterised by the material 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
Definitions
- the invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery cell and a lithium ion battery.
- lithium ion batteries At present, clean and efficient energy conversion energy storage devices such as lithium ion batteries have been widely used.
- types of power lithium-ion batteries there are mainly cylindrical type, laminated aluminum plastic film, wound square (aluminum shell), laminated square and the like.
- Cylindrical batteries have mature technology, high consistency, high design rate, but low capacity.
- For electric vehicles a large number of battery cells are required. The management of battery modules is complicated, and the difference between battery cells leads to battery life and The performance is declining.
- the laminated battery has the advantage of high rate performance, but the process requirements are complicated and there is a problem of easy self-discharge. Winding type square batteries, the capacity can be designed to a higher value, but the rate performance will be reduced.
- the battery is made of an aluminum-plastic film casing, and the battery is easily deformed and damaged by an external force.
- the energy storage field it is inclined to apply a large-capacity single cell, and the energy storage battery has low requirements for rate performance, and the aluminum-shell battery has an advantage in this respect.
- good rate performance is also required. Therefore, designing a larger capacity battery, using an aluminum casing, and improving the rate performance, is of great interest to applications requiring large-capacity single cells, such as electric vehicles and energy storage.
- Laminated batteries are an effective way to make high rate batteries. Due to the lamination characteristics of the laminated battery, the number of the ear is large, and the rate performance is superior. However, the battery preparation efficiency of this structure is low, the layer and the layer are easily displaced, and the edge burrs of the pole piece are more dangerous, and in addition, the self-discharge of such a battery is large.
- the number of poles can be increased by increasing the number of winding cores in parallel, but this can reduce the battery capacity on the one hand, and reduce the preparation efficiency of the battery on the other hand, and may also affect the consistency of the battery. Therefore, there is a need for a new type of lithium ion battery.
- one technical problem to be solved by the present invention is to provide a lithium ion battery cell and a lithium ion battery, which can have a plurality of positive and negative electrodes and form a battery core in a winding manner.
- a lithium ion battery cell comprises: a positive electrode sheet, a separator and a negative electrode sheet, wherein a plurality of positive electrode ears and a plurality of negative electrode ears are sequentially arranged on the positive electrode sheet and the negative electrode sheet in an unfolded state;
- the negative electrode sheet is separated from the separator by a separator and wound to form a lithium ion battery cell, and the plurality of positive electrode tabs and the plurality of negative electrode tabs form a tab-stacked structure or a tab-staggered arrangement structure.
- the lithium ion battery cell is a square cell, and the plurality of positive ears form a tab structure; wherein t is a sum of thicknesses of the positive electrode sheet, the separator and the negative electrode sheet, w is a cell width, a positive electrode ear closest to the head of the positive electrode sheet is a first positive electrode, and n 1 is along the positive electrode sheet.
- the positive electrode tab located on the n 1 at the positive electrode sheet w, n 3 refers to the positive electrode sheet along the head to tail direction, the positive electrode tab located on a w n 3 +1 on the positive electrode sheet At the office.
- the plurality of positive electrode ears form a tab staggered arrangement, wherein d 1 of the m 1 positive ear of the plurality of positive electrodes increases or decreases corresponding thereto a first pitch value; and/or the plurality of negative electrode tabs form a tab staggered arrangement, wherein d 2 of the m 2 negative ear of the plurality of negative ear increases or decreases a second pitch corresponding thereto value.
- the spacing between adjacent two staggered positive electrode ears of the m 1 positive electrode ears is the same.
- d 1 n 1 wx 1 +(0.5 ⁇ t ⁇ n 1 -0.5 ⁇ t)
- q is the spacing between adjacent two staggered positive electrode ears
- m is along the head to the tail of the positive electrode sheet Direction
- sequence number of each positive ear in the m 1 positive electrode ears 1 ⁇ m ⁇ m 1 .
- d 1 n 3 w+x 1 +[0.5 ⁇ t ⁇ (n 3 +1)-0.5 ⁇ t]
- q is the spacing between adjacent two staggered positive electrode ears
- m is along the positive electrode The order of the head to the tail direction of the sheet, and the sequence number of each of the positive and negative ears of the m 1 positive electrode ears, 1 ⁇ m ⁇ m 1 .
- the spacing between adjacent two staggered negative electrode ears of the m 2 negative electrode ears is the same.
- d 2 n 2 wx 2 + (0.5 ⁇ t ⁇ n 2 -0.5 ⁇ t)
- q is the spacing between adjacent two staggered negative electrode ears
- m is along the head to the tail of the negative electrode sheet The direction, the sequence number of each of the negative electrode ears of the m 2 negative electrode ears, 1 ⁇ m ⁇ m 2 .
- d 2 n 4 w + x 2 + [0.5 ⁇ t ⁇ (n 4 +1) - 0.5 ⁇ t]
- q is the spacing between adjacent two staggered negative electrode ears
- m is along the negative electrode The head-to-tail direction of the sheet, the sequence number of each of the negative electrode ears of the m 2 negative electrode ears, 1 ⁇ m ⁇ m 2 .
- the first tab margin x 1 is less than or equal to 0.5 w; and the second tab margin x 2 is less than or equal to 0.5 w.
- the cell width w is greater than or equal to 5 cm and less than or equal to 20 cm.
- a distance between the tail of the positive electrode tab and the positive electrode ear closest thereto is less than 8w; a distance between the tail of the negative electrode tab and the negative electrode ear closest thereto Less than 8w.
- the positive electrode ear is an aluminum tab or an aluminum-nickel alloy tab
- the negative electrode ear is a nickel tab, a copper tab or a copper-nickel alloy tab.
- the plurality of positive electrodes and the plurality of negative electrodes are respectively welded together by ultrasonic waves.
- the positive electrode sheet is coated with a positive electrode slurry prepared by mixing a positive electrode powder, a conductive agent, a binder, and an additive; and coating the negative electrode sheet There is a negative electrode slurry which is prepared by mixing a negative electrode powder, a conductive agent, a binder, and an additive.
- a lithium ion battery comprising: a battery housing and a lithium ion battery cell as described above located within the battery housing.
- the battery casing is an aluminum casing.
- the lithium ion battery cell and the lithium ion battery of the invention can improve the rate performance of the battery, can improve the consistency of the battery core, facilitate the group and modular expansion, ensure stable operation and prolong the service life, and can also improve safety. Performance and increase production efficiency, reduce the incidence of edge burrs on the pole piece, can reduce the self-discharge rate and improve the stability of the battery.
- FIG. 1A and 1B are schematic development views of a positive electrode sheet and a negative electrode sheet of a lithium ion battery cell of the present invention, wherein FIG. 1A is a positive electrode sheet, and FIG. 1B is a negative electrode sheet;
- FIG. 2A and 2B are another exploded view of a positive electrode sheet and a negative electrode sheet of a lithium ion battery cell of the present invention, wherein FIG. 2A is a positive electrode sheet, and FIG. 2B is a negative electrode sheet;
- FIG. 3 is a schematic illustration of one embodiment of a lithium ion battery cell in accordance with the present invention.
- FIG. 4 is a schematic illustration of another embodiment of a lithium ion battery cell in accordance with the present invention.
- Figure 5 is a schematic view showing the coating and the tab position of the lithium ion battery cell of the present invention.
- FIG. 6 is a diagram showing a pole piece coating and a tab distribution of a lithium ion battery cell of the present invention
- Figure 7 is a diagram showing the arrangement of the bipolar positive electrode spacing 0.5 cm pole piece of the lithium ion battery cell of the present invention.
- FIG. 8 is a view showing a negative electrode sheet of three tabs arranged in a lithium ion battery cell of the present invention.
- Fig. 9 is a view showing a position of a tab arrangement of a lithium ion battery cell of the present invention having an overlapping and arranging dual mode.
- the present invention provides a lithium ion battery cell in which a plurality of positive electrode tabs and a plurality of negative electrode tabs are sequentially arranged on a positive electrode sheet and a negative electrode sheet in an unfolded state, and a winding method is adopted.
- the positive electrode tab and the negative electrode tab are separated by a separator and wound to form a lithium ion battery cell, and the plurality of positive electrode tabs and the plurality of negative electrode tabs form a tab structure or a tab staggered arrangement.
- the plurality of positive electrodes and the plurality of negative electrodes may be located at one end of the lithium ion battery cells at the same time, or may be located at both ends of the lithium ion battery cells.
- the lithium ion battery cell of the invention is provided with more than one positive electrode ear and more than one negative electrode ear, which not only makes the battery have good high current discharge performance, but also can select the density of the ear according to actual production needs.
- the use of a wound multi-pole design instead of a laminate design greatly reduces the incidence of edge burrs on the pole pieces, thereby reducing the self-discharge rate and improving the stability of the battery.
- a plurality of positive electrodes are arranged in parallel along the length direction of the positive electrode tab 6, and the distance between the first positive electrode tab 2 and the head of the positive electrode tab 6 is the first tab margin x 1 .
- the head of the positive electrode tab 6 is the left end of the positive electrode tab 6, and the positive electrode ear closest to the head of the positive electrode tab 6 is the first positive electrode tab 2.
- the tabs are generally not placed on the leftmost or rightmost side of the cell. Setting the tab margins allows for easy cell packaging and avoids possible short circuits. The distance from the tab to the edge of the cell is the margin of the ear.
- n 1 refers to the head portion along the direction of the positive electrode plate 6 to the tail, the positive electrode tab located on the n 1 w at the positive electrode sheet, n 1 ⁇ 2.
- n 1 4
- a plurality of negative electrode ears are arranged in parallel along the longitudinal direction of the negative electrode tab 5, and a distance between the first negative electrode tab 1 and the head of the negative electrode tab 5 is a second tab margin x 2 , and a plurality of negative ear tabs
- n 2 refers to the negative electrode plate along the direction of the head to the tail 5, the negative electrode tab located on the w-n 2 at the negative electrode sheet 5, n 2 ⁇ 2.
- a plurality of positive electrodes are arranged in parallel along the length direction of the positive electrode tab 6, and the distance between the first positive electrode tab 2 and the head of the positive electrode tab 6 is the first tab margin x 1
- n 3 means the n 3 +1th w at the positive electrode tab 6 in the direction from the head to the tail of the positive electrode tab 6 .
- the positive electrode tab may be calculated d 4 1, and so can calculate the remaining positive tab d 1.
- n 4 means the direction from the head to the tail of the negative electrode tab 5, and the negative electrode tab is located at the n 4 +1th w on the negative electrode tab 5.
- n 4 4w + x 1 + [0.5 ⁇ t ⁇ (4 + 1) - 0.5 ⁇ t]
- the remaining parameter values into specific the negative electrode tab may be calculated 2 d 3, and so can calculate the remaining negative tab d 2.
- the lithium ion battery cell is a square cell, and a separator is disposed between the positive electrode 6 and the negative electrode 5, which may be two or more layers.
- a separator is disposed between the positive electrode 6 and the negative electrode 5, which may be two or more layers.
- a plurality of positive electrodes are formed.
- Ear and more The negative electrode ears can form a tab structure, as shown in FIG. 3, after the winding, the positive and negative ears are neatly overlapped with one end of the battery cell 7, and x is the tab edge.
- the first tab margin x 1 and the second tab margin x 2 may be the same or different.
- the first tab margin x 1 is less than or equal to 0.5 w; the second tab margin x 2 is less than or equal to 0.5 w.
- w is the cell width, and the cell width w is greater than or equal to 5 cm and less than or equal to 20 cm.
- h is the height, the range of h is 5 cm ⁇ h ⁇ 20 cm, the thickness of the cell is d, and the range is 0.5 cm ⁇ d ⁇ 5 cm.
- the negative electrode sheet length L 1 and the positive electrode sheet length L 2 are: 10 w ⁇ L 1 and L 2 ⁇ 200 w.
- y is the length of the tail, 0 ⁇ y ⁇ 8w.
- the lithium ion battery cell in the above embodiment adopts a winding mode, and after the first tab is set, the position of the second or more tabs is passed by the formula nw-x+(0.5 ⁇ t ⁇ n-0.5 ⁇ t) or nw. +x+[0.5 ⁇ t ⁇ (n+1)-0.5 ⁇ t] is calculated.
- the above two formulas are general formulas for calculating the second or more positive and negative ear.
- x is replaced by x 1 or x 2
- n is adopted by n 1 , n 2 , n 3 Or n 4 replacement.
- the position of the tab calculated by nw+x+[0.5 ⁇ t ⁇ (n+1)-0.5 ⁇ t falls at the rear end at nw
- the position of the tab calculated by nw-x+(0.5 ⁇ t ⁇ n-0.5 ⁇ t) falls.
- the current collector of the positive electrode sheet is an aluminum foil
- the current collector of the negative electrode sheet is a copper foil.
- the positive electrode slurry containing the lithium ion active material is continuously and uniformly coated on the aluminum foil to form a positive electrode sheet
- the negative electrode slurry containing the lithium ion active material is continuously and uniformly coated on the copper foil to prepare a negative electrode sheet.
- the positive and negative electrode sheets are reserved for the positive and negative electrodes.
- the use of a welded multi-pole design to fabricate the core in a coiled manner can improve the rate performance of medium and large-sized lithium-ion batteries while achieving good consistency and stability of the battery, facilitating grouping and modular expansion. Guarantee the stable operation of the system and extend the service life.
- the plurality of negative electrode ears may form a tab-staggered arrangement structure, and d 2 of the m 2 negative electrode ears of the plurality of negative electrode ears are increased or decreased by a second pitch value corresponding thereto, so that the plurality of overlapping negative electrode pairs are arranged
- m 2 negative electrode staggered arrays m 2 may be 1, 2, 3, etc., and the spacing between adjacent two staggered negative electrode ears may be the same or different.
- the negative electrode array 1' and the positive electrode array 2' in Fig. 4 are in a staggered arrangement.
- m 1 positive electrodes of each of the positive electrode tab d 1 of each ear a first spacing value plus mq.
- d 1 n 3 w+x 1 +[0.5 ⁇ t ⁇ (n 3 +1)-0.5 ⁇ t]
- q is the spacing between adjacent two staggered positive electrode ears
- m is along the head of the positive electrode sheet
- m 2 negative electrodes of adjacent ears same pitch between two staggered negative electrode tab.
- M 2 from the first negative electrodes in the ear begins, m 2 of each of the negative electrodes negative electrode tab ear d 2 of the first spacing value subtracting mq.
- d 2 n 2 wx 2 +(0.5 ⁇ t ⁇ n 2 -0.5 ⁇ t), q is the spacing between adjacent two staggered negative electrode ears, m is along the head to the tail of the negative electrode sheet, m 2 The sequence number of each negative electrode ear in the negative electrode ear, 1 ⁇ m ⁇ m 2 .
- ears m 2 negative electrodes of each of the negative electrode tab respectively, d 2 of the first spacing value plus mq.
- d 2 n 4 w+x 2 +[0.5 ⁇ t ⁇ (n 4 +1)-0.5 ⁇ t]
- q is the spacing between adjacent two staggered anode ears
- m is along the head of the negative electrode sheet
- the overlap of the poles of the lithium-ion battery cell satisfies the formula nw+x+[0.5 ⁇ t ⁇ (n+1)-0.5 ⁇ t and nw-x+(0.5 ⁇ t ⁇ n-0.5 ⁇ t), which is the basis of the above two formulas.
- the tabs are arranged in a staggered manner, and the spacing between two adjacent tabs is q. If the first ear is in the middle, the left ear position is moved q to the outside, and the right side is moved q to the inside. For the tab that calculates the position by nw-x+(0.5 ⁇ t ⁇ n-0.5 ⁇ t), since the tab is at the back end at nw, The two ears start, the ear needs to move forward. For the ear that calculates the position by nw+x+[0.5 ⁇ t ⁇ (n+1)-0.5 ⁇ t], the ear is at the front end at (n+1)w So, starting from the second ear, the ear needs to move backwards.
- the present invention provides a lithium ion battery comprising: a battery housing and a lithium ion battery cell as described above located within the battery housing.
- the negative electrode and the positive electrode are located on the same side of the battery core, and the positive and negative ear can be connected to the pole of the battery case by bolting or riveting.
- the battery case is an aluminum case or the like.
- the positive electrode sheet is coated with a positive electrode slurry, and the positive electrode slurry is prepared by mixing a positive electrode powder, a conductive agent, a binder, and an additive.
- a negative electrode slurry is coated on the negative electrode sheet, and the negative electrode slurry is prepared by mixing a negative electrode powder, a conductive agent, a binder, and an additive.
- the aluminum shell side wall and the positive wall thickness are both 0.3 mm, the bottom thickness is 0.6 mm, the design cell thickness d is 0.82 cm, the positive electrode sheet width is 14 cm, the negative electrode sheet width is 14.2 cm, and the diaphragm width is 14.5 cm. .
- the positive active material is a ternary material with a specific capacity of 150 mAh/g; the negative active material is artificial graphite or composite graphite, the specific capacity is 345 mAh/g, and the negative electrode capacity is 4% excess.
- the composition of the positive electrode slurry was: 95.5% ternary material, 2% binder, 1.5% conductive agent and 1% nano inorganic functional additive.
- the compacted density was 3.6 g/cm 3
- the thickness of the single layer coating was 0.064 mm
- the areal density was 461 g/m 2
- the thickness of the current collector aluminum foil was 0.012 mm
- the calculated unit capacity was 7.224 mAh/cm 2 .
- the composition of the negative electrode slurry was: 95.5% ternary material, 1.2% thickener, 1.5% binder, 1% conductive agent and 0.8% nano inorganic functional additive.
- the compacted density was 1.5 g/cm 3
- the thickness of the single layer coating was 0.070 mm
- the areal density was 224 g/m 2
- the thickness of the current collector aluminum foil was 0.009 mm
- the calculated unit capacity was 7.4 mAh/cm 2 .
- t is 0.33 mm.
- the length of the pole piece having the coating was 175 cm according to the thickness of the core, the thickness of the positive and negative electrodes, and the thickness of the separator.
- the specific coating size is shown in Table 1 below, and the battery capacity was 35 Ah.
- the coating schematic is shown in Fig. 5, where x is set to 1.5 cm, the width of the tab is 1.5 cm, and w is calculated to be 7 cm (the width of the innermost unit roll layer after the needle is withdrawn).
- nw+x+[0.5 ⁇ t ⁇ (n+1)-0.5 ⁇ t] the specificity of each ear
- the position is calculated as shown in Fig. 5 (the pitches of the positive and negative ears are the same).
- the ear solder can be soldered directly to the aluminum cap or welded to a large transition piece of metal and then soldered to the cap of the aluminum case.
- a wettable negative active material such as a slightly oxidized graphite material can be used.
- a silicon carbon negative electrode material can be used, which has a certain absorption effect on the increase in capacity.
- the position of the positive ear position is the same as the positive ear position in FIG. 5, and the position of the negative ear is arranged in accordance with the following formula: nw-x+(0.5 ⁇ t ⁇ n-0.5 ⁇ t), the specific position is as shown in FIG. 6 is shown.
- the poles of the lithium ion battery cell are arranged in a staggered arrangement, and the positive and negative electrodes are each provided with 2 tabs, the pitch of the tabs is 0.5 cm, and the distribution of the tabs is nw-x+(0.5 ⁇ t ⁇ n- In the case of 0.5 ⁇ t), as long as one of the tab positions is moved forward by 0.5 cm, a staggered arrangement is formed, and the pitches of the staggered arrays are the same.
- the tabs of the lithium ion battery cells are in a staggered arrangement.
- Three tabs are provided on each of the positive and negative electrodes, each of which has a width of 1 cm, and a staggered arrangement of the tabs has an interval of 0.4 cm.
- the position of the negative electrode ear is as shown in Fig. 8, and the position of the positive electrode ear is similar to the position of the negative electrode ear.
- the tabs of the lithium ion battery cells are either overlapped or staggered.
- the overlapping tabs are two sets of tabs, and the staggered tabs are spaced 0.5 cm apart.
- the position of the overlapping tabs is at nw+x+[0.5 ⁇ t ⁇ (n+1)-0.5 ⁇ t], and the positions of the staggered tabs are at Nw+x+[0.5 ⁇ t ⁇ (n+1)-0.5 ⁇ t]+0.5, as shown in Fig.
- the overlapped tabs have n of 4 and 8 (corresponding to 30.2 cm and 59.8 cm), and another set of overlaps
- the tabs of the tabs are 16 and 20 (corresponding to 121.9 cm and 153.9 cm), or the positions of the overlapping tabs are at nw-x+(0.5 ⁇ t ⁇ n-0.5 ⁇ t), and the positions of the staggered tabs are at nw- x+(0.5 ⁇ t ⁇ n-0.5 ⁇ t)-0.5.
- the lithium ion battery cell and the lithium ion battery adopt multi-pole design, which greatly improves the rate performance of the battery;
- the multi-pole design based on the winding method can improve the consistency of the battery core, and is favorable for the consistency of the battery core.
- the formation of lithium phenomenon improves the safety performance while improving the production efficiency;
- the winding multi-pole design instead of the lamination design greatly reduces the generation rate of the edge burr of the pole piece, thereby reducing the self-discharge rate.
- Improve battery stability is described in order to avoid the complicated process caused by blanking the positive electrode area corresponding to the negative electrode ear.
- the methods and systems of the present invention may be implemented in a number of ways.
- the methods and systems of the present invention can be implemented in software, hardware, firmware, or any combination of software, hardware, and firmware.
- the above-described sequence of steps for the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless otherwise specifically stated.
- the invention may also be embodied as a program recorded in a recording medium, the program comprising machine readable instructions for implementing the method according to the invention.
- the invention also covers a recording medium storing a program for performing the method according to the invention.
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Abstract
Description
Claims (18)
- 一种锂离子电池电芯,包括:正极片、隔膜和负极片,其特征在于:在展开状态下的所述正极片、所述负极片上分别依次排列有多个正极耳、多个负极耳;所述正极片与所述负极片通过所述隔膜隔开并卷绕形成锂离子电池电芯,所述多个正极耳和所述多个负极耳形成极耳叠合结构或极耳错开排列结构。
- 如权利要求1所述的锂离子电池电芯,其特征在于:所述多个正极耳沿所述正极片的长度方向平行排列,第一正极耳与所述正极片头部之间的距离为第一极耳边距x1,所述多个正极耳中的其余正极耳与所述正极片头部之间的距离为d1,d1=n1w-x1+(0.5πt∑n1-0.5πt)或d1=n3w+x1+[0.5πt∑(n3+1)-0.5πt];锂离子电池电芯为方形电芯,所述多个正极耳形成极耳叠合结构;其中,t为所述正极片、所述隔膜和所述负极片厚度的和,w为电芯宽度,距离所述正极片头部最近的正极耳为第一正极耳,n1是指沿所述正极片的头部到尾部的方向、正极耳位于正极片上的第n1个w处,n3是指沿所述正极片的头部到尾部的方向、正极耳位于正极片上的第n3+1个w处。
- 如权利要求2所述的锂离子电池电芯,其特征在于:所述多个负极耳沿所述负极片的长度方向平行排列,第一负极耳与所述负极片头部之间的距离为第二极耳边距x2,所述多个负极耳中的其余负极耳与所述负极片头部之间的距离为d2,d2=n2w-x2+(0.5πt∑n2-0.5πt)或d2=n4w+x2+[0.5πt∑(n4+1)-0.5πt];所述多个负极耳形成极耳叠合结构;其中,距离所述负极片头部最近的负极耳为第一负极耳,n2是指沿所述负极片的头部到尾部的方向、负极耳位于负极片上的第n2个w处,n4是指沿所述负极片的头部到尾部的方向,负极耳位于负极片上的第n4+1个w处。
- 如权利要求3所述的锂离子电池电芯,其特征在于:所述多个正极耳形成极耳错开排列结构,其中,所述多个正极耳中的m1个正极耳的d1增加或减去与其相对应的第一间距值;和/或所述多个负极耳形成极耳错开排列结构,其中,所述多个负极耳中的m2个负极耳的d2增加或减去与其相对应的第二间距值。
- 如权利要求4所述的锂离子电池电芯,其特征在于:所述m1个正极耳中相邻两个错开排列的正极耳之间的间距相同。
- 如权利要求5所述的锂离子电池电芯,其特征在于:从所述m1个正极耳中的第一个开始,所述m1个正极耳中的每个正极耳的d1分别减去第一间距值mq;其中,d1=n1w-x1+(0.5πt∑n1-0.5πt),q为相邻两个错开排列的正极耳之间的间距,m为沿所述正极片的头部到尾部方向、所述m1个正极耳中的各正极耳的顺序号,1≤m≤m1。
- 如权利要求5所述的锂离子电池电芯,其特征在于:从所述m1个正极耳中的第一个开始,所述m1个正极耳中的每个正极耳的d1分别加上第一间距值mq;其中,d1=n3w+x1+[0.5πt∑(n3+1)-0.5πt],q为相邻两个错开排列的正极耳之间的间距,m为沿所述正极片的头部到尾部方向、所述m1个正极耳中的各正极耳的顺序号,1≤m≤m1。
- 如权利要求4所述的锂离子电池电芯,其特征在于:所述m2个负极耳中相邻两个错开排列的负极耳之间的间距相同。
- 如权利要求8所述的锂离子电池电芯,其特征在于:从所述m2个负极耳中的第一个开始,所述m2个负极耳中的每个负极耳的d2分别减去第一间距值mq;其中,d2=n2w-x2+(0.5πt∑n2-0.5πt),q为相邻两个错开排列的负极耳之间的间距,m为沿所述负极片的头部到尾部方向、所述m2个负极耳中的各负极耳的顺序号,1≤m≤m2。
- 如权利要求8所述的锂离子电池电芯,其特征在于:从所述m2个负极耳中的第一个开始,所述m2个负极耳中的每个负极耳的d2分别加上第一间距值mq;其中,d2=n4w+x2+[0.5πt∑(n4+1)-0.5πt],q为相邻两个错开排列的负极耳之间的间距,m为沿所述负极片的头部到尾部方向、所述m2个负极耳中的各负 极耳的顺序号,1≤m≤m2。
- 如权利要求3所述的锂离子电池电芯,其特征在于:所述第一极耳边距x1小于等于0.5w;所述第二极耳边距x2小于等于0.5w。
- 如权利要求3所述的锂离子电池电芯,其特征在于:所述电芯宽度w大于等于5cm并小于等于20cm。
- 如权利要求3所述的锂离子电池电芯,其特征在于:所述正极片尾部与距离其最近的正极耳之间的距离小于8w;所述负极片尾部与距离其最近的负极耳与之间的距离小于8w。
- 如权利要求1所述的锂离子电池电芯,其特征在于:所述正极耳为铝极耳或铝镍合金极耳;所述负极耳为镍极耳、铜极耳或铜镍合金极耳。
- 如权利要求1所述的锂离子电池电芯,其特征在于:所述多个正极耳、所述多个负极耳分别通过超声波焊接在一起。
- 如权利要求1所述的锂离子电池电芯,其特征在于:在所述正极片上涂有正极浆料,所述正极浆料由正极粉料、导电剂、粘接剂和添加剂混合制成;在所述负极片上涂有负极浆料,所述负极浆料由负极粉料、导电剂、粘接剂和添加剂混合制成。
- 一种锂离子电池,其特征在于,包括:电池外壳和位于所述电池外壳内的如权利要求1至16任意一项所述的锂离子电池电芯。
- 如权利要求17所述的锂离子电池,其特征在于:所述电池外壳为铝外壳。
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CN108987655A (zh) * | 2017-05-31 | 2018-12-11 | 东莞新能源科技有限公司 | 电池 |
CN108461811B (zh) * | 2018-07-20 | 2019-11-05 | 瑞浦能源有限公司 | 一种用于卷绕式锂离子电池的极片及电芯 |
CN108461829B (zh) * | 2018-07-20 | 2018-11-02 | 上海瑞浦青创新能源有限公司 | 一种卷绕式锂离子电池的电芯 |
CN109802088B (zh) * | 2019-03-20 | 2020-10-09 | 江西理工大学 | 一种可快充锂离子电池及其制作方法 |
CN115275365A (zh) * | 2019-09-25 | 2022-11-01 | 荣耀终端有限公司 | 支持高功率快充的电池模组、充电模组和电子设备 |
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