CN216436077U - Pole piece and tab connection structure and soft package lithium ion battery - Google Patents
Pole piece and tab connection structure and soft package lithium ion battery Download PDFInfo
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- CN216436077U CN216436077U CN202122999395.9U CN202122999395U CN216436077U CN 216436077 U CN216436077 U CN 216436077U CN 202122999395 U CN202122999395 U CN 202122999395U CN 216436077 U CN216436077 U CN 216436077U
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Abstract
The utility model belongs to the technical field of the lithium cell, especially, relate to a pole piece utmost point ear connection structure and soft packet of lithium ion battery. The pole piece and pole lug connecting structure comprises a pole piece and a pole lug; the pole piece comprises a coating area and an uncoated lead-out pole lug area, the lead-out pole lug area is arranged on one side of the coating area, and the width of the lead-out pole lug area is less than or equal to that of the coating area; the tab is connected to the tab extraction area and extends away from the paint area. The utility model discloses in, adopt utmost point ear and the mode of drawing forth utmost point ear regional connection, draw forth utmost point ear region can the heat and the heat dissipation of balanced utmost point ear department, increase the ability of overflowing of utmost point ear department, make the ability of overflowing of utmost point ear department satisfy the use of battery under heavy current operating mode, do benefit to the heat dissipation of battery, improve the security of battery. Meanwhile, the design and process difficulty of the battery can be reduced, the welding strength of the tab can be enhanced in the tab leading-out area, and the packaging difficulty of the soft package battery is reduced.
Description
Technical Field
The utility model belongs to the technical field of the lithium cell, especially, relate to a pole piece utmost point ear connection structure and soft packet of lithium ion battery.
Background
At present, batteries can be divided into 3C batteries, power batteries and the like, the 3C batteries are soft package batteries generally, the capacity of the batteries is relatively small, the power batteries are generally used in the fields of automobiles and the like, the capacity of the power batteries is generally large, the power batteries are aluminum shell batteries generally, and the purpose is to enhance the compression resistance and have a good heat dissipation effect in the use process of the batteries. However, aluminum-can batteries have a lower volumetric energy density than pouch batteries and are less safe than pouch batteries. In order to apply the characteristics of the pouch battery to a wider field, the capacity of the pouch battery must be improved.
The improvement of the energy density of the battery pack and the increase of the volume of the battery core are one of the development directions of the current energy storage battery and power battery. The group battery that large capacity battery cell formed, used interconnecting link reduces, and is convenient in groups, and subsequent management and maintenance of being convenient for avoid establishing ties or parallelly connected more inconsistent problem that arouses by a plurality of little batteries simultaneously. On the other hand, the aluminum-plastic film used by the soft package battery is small in volume and light in weight, so that the soft package battery has higher volume energy density compared with an aluminum shell battery under the same condition. However, if the capacity of the soft package battery is too large and the heat conduction capability of the aluminum-plastic film is poor, a large amount of heat accumulation can be generated due to untimely heat dissipation in the charging and discharging process of the battery, and potential safety hazards can occur. And, because the battery capacity is high, when the battery carries out charge-discharge with higher multiplying power, the ability of overflowing of utmost point ear becomes very important, need consider the current density of battery utmost point ear department under the heavy current operating mode simultaneously, and the utmost point ear not only needs to satisfy the high current density that heavy current brought and still guarantees that the battery can not bring the potential safety hazard because the strong local temperature rise of utmost point ear heat production initiation in operating condition.
When the size of the tab is too large, the weight reduction and the space reduction of the battery are not facilitated, and when the size of the tab is too small, the overcurrent capacity of the battery is poor, and the problem of the matching between the size of the tab and the overcurrent capacity of the tab needs to be considered. More importantly, when the battery charges and discharges with the heavy current, compare in electric core, utmost point ear department can form very high current density, can produce a large amount of joule heats, along with thermal accumulation, utmost point ear constantly heaies up, when utmost point ear department temperature reached 65 ℃, to the laminate polymer battery of plastic-aluminum membrane encapsulation, probably causes the encapsulation badly.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the pole piece and lug connecting structure and the soft package lithium ion battery are provided for solving the problems of poor lug overcurrent capacity and serious heating of the existing high-capacity soft package battery.
In order to solve the above technical problem, on one hand, an embodiment of the present invention provides a pole piece and pole lug connection structure, including a pole piece and a pole lug;
the pole piece comprises a coating area and an uncoated lead-out pole lug area, the lead-out pole lug area is arranged on one side of the coating area, and the width of the lead-out pole lug area is less than or equal to that of the coating area; the tab is connected to the lead-out tab area, and the tab extends away from the paint area.
Optionally, the width of the lead-out tab region is greater than the width of the tab.
Optionally, the width of the tab leading-out area is 30-1300 mm, and the length of the tab leading-out area is 10-60 mm.
Optionally, the width of the tab is 30-1000 mm, the thickness of the tab is 0.08-1.0 mm, and the length of the tab is 40-150 mm.
Optionally, the length of the pole piece is 300-3000 mm; the width of the pole piece is 100-1300 mm.
On the other hand, the embodiment of the utility model provides a soft packet of lithium ion battery, lithium ion battery's electric core includes diaphragm, positive pole ear, negative pole ear, a plurality of positive plate, a plurality of negative pole piece and as before pole piece utmost point ear connection structure, the diaphragm is located the positive plate with between the negative pole piece, the positive plate with between the positive pole ear and the negative pole piece with all pass through between the negative pole ear pole piece utmost point ear connection structure connects.
Optionally, the positive electrode plates, the negative electrode plates and the separators are stacked, the number of the positive electrode plates is 38-92, and the number of the negative electrode plates is 38-92.
Optionally, the length of the battery cell is 300-3000 mm, and the width of the battery cell is 100-1300 mm.
Optionally, the thickness of the battery cell is 10-24 mm.
Optionally, the battery cell has a first end and a second end opposite to each other along the length direction of the battery cell, the positive tab is located at the first end of the battery cell, and the negative tab is located at the second end of the battery cell.
Optionally, the battery cell has a first side and a second side opposite to each other along the width direction of the battery cell, and the positive electrode tab and the negative electrode tab are located on the first side or the second side of the battery cell.
The utility model discloses in, adopt utmost point ear with draw forth the mode of drawing forth of utmost point ear regional connection, it can be balanced at the battery during operation to draw forth utmost point ear region the heat and the heat dissipation of utmost point ear department can increase the ability of overflowing of utmost point ear department, reduce the joule heat of utmost point ear department, make the ability of overflowing of utmost point ear department satisfy the use of battery under the heavy current operating mode, draw utmost point ear region with utmost point ear combined action increases the heat dissipation of battery, improves the security of battery. Simultaneously, compare in prior art through setting up the mode of a plurality of utmost point ears reinforcing overcurrent ability, can reduce the design and the technology degree of difficulty of battery, it can strengthen to draw out utmost point ear region the welding strength of utmost point ear is difficult for arousing and causes the torn condition of pole piece by a plurality of distributed utmost point ears, reduces laminate polymer battery's the encapsulation degree of difficulty.
Drawings
Fig. 1 is a schematic view of a pole piece when the width of a tab extraction region provided by an embodiment of the present invention is smaller than a coating region;
fig. 2 is a schematic diagram of a pole piece when the width of the tab extraction region is equal to the coating region according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an electrical core when a width of a tab leading-out region is smaller than a coating region according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an electrical core when the width of the tab leading-out region is equal to the coating region according to an embodiment of the present invention;
fig. 5 is an exploded view of a battery cell according to an embodiment of the present invention;
fig. 6 is a schematic side view of a battery cell according to an embodiment of the present invention;
fig. 7 is a schematic view of a battery cell after a tab is welded according to an embodiment of the present invention.
The reference numerals in the specification are as follows:
1. a coating area; 2. leading out a tab area; 3. a tab; 4. a diaphragm; 5. a positive tab; 6. a negative tab; 7. a positive plate; 71. leading out a positive lug area; 8. a negative plate; 81. and a negative electrode tab region is led out.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 to fig. 7, on the one hand, an embodiment of the present invention provides a pole piece and tab connection structure, which includes a pole piece and a tab 3. The pole piece includes regional 1 of coating and the regional 2 of drawing forth utmost point ear of uncoated, the pole piece the coating has active material on the regional 1 of coating, the pole piece is two-sided coating, draw forth utmost point ear regional 2 for uncoated active material's mass flow body promptly, it sets up to draw forth utmost point ear regional 2 one side of coating 1, draw forth utmost point ear regional 2 width less than or equal to the width of coating 1, utmost point ear 3 is connected draw forth on the utmost point ear region 2, utmost point ear 3 towards keeping away from the regional 1 direction of coating extends, has during the battery charge-discharge of pole piece utmost point ear connection structure, the electric current can utmost point ear 3 with draw forth and lead to between the utmost point ear region 2.
The utility model discloses in, adopt utmost point ear 3 with draw forth the mode of drawing forth of utmost point ear regional 2 connection, it can be balanced at the battery during operation to draw forth utmost point ear region the heat and the heat dissipation of utmost point ear department can increase the ability of overflowing of utmost point ear 3 department, reduces the joule heat of utmost point ear department, makes the ability of overflowing of utmost point ear 3 department satisfy the use of battery under the heavy current operating mode, draw forth utmost point ear region with utmost point ear dispels the heat jointly, increases the radiating rate of battery, improves the security of battery. Simultaneously, compare in prior art through the mode that sets up a plurality of utmost point ears 3 reinforcing ability of overflowing, can reduce the design and the technology degree of difficulty of battery, it can strengthen to draw forth utmost point ear region the welding strength of utmost point ear 3 is difficult for arousing to cause the torn condition of pole piece by a plurality of distributed utmost point ears 3, reduces laminate polymer battery's the encapsulation degree of difficulty.
In an embodiment, as shown in fig. 2, the width of leading out utmost point ear region 2 equals when the width of coating region 1, the width of leading out utmost point ear region 2 equals the width of the mass flow body of pole piece is applicable to the little battery cell of volume and weight requirement, when the width of leading out utmost point ear region 2 is great, more easily play balanced thermal effect, improve battery heat dissipation.
As shown in fig. 1, the battery that has the requirement to volume and weight can adopt the width of drawing utmost point ear region 2 is less than the width of coating region 1, the width of drawing utmost point ear region 2 can carry out rationalization design according to battery cell's heat production, can satisfy the heat dissipation of electric current under the heavy current operating mode, can reduce laminate polymer battery's the encapsulation degree of difficulty again.
In one embodiment, the pole piece can be a positive pole piece or a negative pole piece, the positive pole piece and the negative pole piece both comprise a coating area 1 and a tab leading-out area 2, and the tab 3 can be a positive tab or a negative tab.
The tab 3 is welded on the tab leading-out area 2, various welding modes such as ultrasonic spot welding and laser welding can be adopted, and the welded battery core is packaged through an aluminum plastic film.
As shown in fig. 1 and 2, in one embodiment, the width of the tab extraction region 2 is greater than the width of the tab 3. In order to satisfy large capacity battery's overcurrent capacity, need right according to single battery's heat production utmost point ear 3 the size with draw forth utmost point ear regional 2 the size and carry out rationalization design, utmost point ear 3 welding is in draw forth utmost point ear regional 2 on, in principle, utmost point ear 3's width can be equal to or is less than draw forth utmost point ear regional 2's width, consider from the aspect of the production degree of difficulty, prefer draw forth utmost point ear regional 2's width is greater than utmost point ear 3's width.
In one embodiment, the width of the tab leading-out region 2 is 30-1300 mm, and the length is 10-60 mm. The width of the tab leading-out region 2 is the dimension in the width direction of the pole piece, and the length is the dimension in the length direction of the pole piece.
In one embodiment, the width of the tab 3 is 30-1000 mm, the thickness is 0.08-1.0 mm, and the length is 40-150 mm. The width of the tab 3 is the dimension in the width direction of the pole piece, and the length is the dimension in the length direction of the pole piece.
In one embodiment, the length of the pole piece is 300-3000 mm; the width of the pole piece is 100-1300 mm.
As shown in fig. 3 to 7, on the other hand, an embodiment of the present invention provides a soft package lithium ion battery, the electric core of the lithium ion battery includes a diaphragm 4, a positive tab 5, a negative tab 6, a plurality of positive plates 7, a plurality of negative plates 8 and the pole piece tab connection structure as described above, the diaphragm 4 is located between the positive plates 7 and the negative plates 8, the positive plates 7 and between the positive tabs 5 and between the negative plates 8 and between the negative plates 6 are all connected through the pole piece tab connection structure.
Specifically, positive plate 7 with negative pole piece 8 structure is the same, including coating region 1 and draw forth anodal ear region 71 on the positive plate 7, the regional 1 coating of coating has anodal active material, anodal ear 5 welds draw forth on the anodal ear region 71, negative pole piece 8 also includes coating region 1 and draws forth negative pole ear region 81, the regional 1 coating of coating has negative pole active material, negative pole ear 6 welds draw forth on the negative pole ear region 81, positive plate 7 with negative pole piece 8 is two-sided coating active material.
As shown in fig. 5, in an embodiment, the positive electrode sheets 7, the negative electrode sheets 8 and the separators 4 are stacked, the number of the positive electrode sheets 7 is 38 to 92, the number of the negative electrode sheets 8 is 38 to 92, the separators 4 are used for isolating the positive electrode sheets 7 from the negative electrode sheets 8, and the number of the separators 4 is determined according to the number of the positive electrode sheets 7 and the negative electrode sheets 8.
In an embodiment, the length of the battery cell is 300-3000 mm, the width of the battery cell is 100-1300 mm, the thickness of the battery cell is 10-24 mm, and the thickness of the battery cell is the total thickness of the positive plate 7, the negative plate 8 and the diaphragm 4 after lamination.
The positive and negative pole pieces are arranged in a stacked manner, and the lead-out tab areas 2 on the positive and negative pole pieces can be positioned on the same side or the opposite side of the battery cell. The battery core is provided with a positive tab 5 and a negative tab 6, the positive tab 5 and the negative tab 6 can be respectively led out from two ends of the battery in the length direction or from the same side, and simultaneously the positive tab 5 and the negative tab 6 are arranged in a middle mode or in a two-end symmetrical mode.
As shown in fig. 3 to 4, in one embodiment, the battery cell has a first end and a second end opposite to each other along the length direction of the battery cell, the tab leading-out region 2 is arranged at the end part of the pole piece, the tab 3 extends along the length direction of the pole piece, when the positive electrode sheet 7 and the negative electrode sheet 8 are laminated, the lead-out positive electrode tab region 71 of the positive electrode sheet 7 is disposed at the first end, the lead-out negative tab region 81 of the negative tab 8 is disposed at the second end, and after the tab 3 is welded, the positive tab 5 is located at a first end of the battery cell, the negative tab 6 is located at a second end of the battery cell, and the positive tab 5 is welded at the middle position of the positive tab 7 in the region 71 from which the positive tab is led out, the negative electrode tab 6 is welded at the middle position of the lead-out negative electrode tab region 81 of the negative electrode sheet 8.
In another embodiment not shown in the drawings, the battery cell has a first side and a second side opposite to each other along the width direction of the battery cell, and the positive electrode tab 5 and the negative electrode tab 6 are located on the first side or the second side of the battery cell. In this embodiment, draw utmost point ear region 2 and set up the side department of pole piece, coating region 1 with draw utmost point ear region 2 along the length direction setting of pole piece, utmost point ear 3 welding is in draw utmost point ear region 2, utmost point ear 3 along the width direction extension of pole piece. When welding utmost point ear, anodal ear 5 is in on the positive plate 7 draw forth the welding position of anodal ear region 71, with negative pole ear 6 is in on the negative pole piece 8 draw forth the welding position of negative pole ear region 81 different, anodal piece 7 with the back is folded to negative pole piece 8, anodal ear 5 with negative pole ear 6 is located same one side of electricity core.
The two tabs 3 of the battery cell are located on the same side or the opposite side and need to be determined according to the actual design requirements of the battery.
Because its capacity is lower, in the battery use, the heat that produces is less, can not cause the safety problem to even under the operating mode of heavy current, utmost point ear 3's overcurrent capacity satisfies its operation requirement completely, therefore the less laminate polymer battery of capacity is lower to utmost point ear 3's requirement, and need not to excessively consider the heat production problem of battery under the high rate operating condition. However, after the soft package battery is amplified, the capacity of the soft package battery reaches dozens of times or even hundreds of times of that of a small soft package battery, when the large-capacity soft package battery works under a large-current working condition, the overcurrent capacity of the tab 3 becomes very important, the tab 3 not only needs to meet the high current density brought by the large current, but also needs to ensure that the battery cannot bring potential safety hazards due to strong local temperature rise caused by heat generation of the tab 3 in a working state.
Due to the consideration of the overcurrent capacity of the battery and the heat production of the tab 3, the size of the tab 3 of the battery needs to be reasonably designed, and the safe and reasonable size design range of the tab 3 is provided, so that the safe use of the battery under the large-current working condition is met. In actual production, the multi-tab 3 design does not meet the economic and efficient production target under certain conditions, the requirements on equipment are higher in the processes of pole piece cutting and tab 3 welding, the phenomenon that the tab 3 is welded inconsistently is easy to occur, the packaging difficulty of the soft package battery is increased, and the problems of liquid leakage and the like are easily caused. The utility model discloses a 2 of drawing forth utmost point ear region of integration mode reduces the technology degree of difficulty, according to the battery capacity with need satisfy the biggest requirement of discharging to and utmost point ear 3 carries out the utmost point ear 3 design that suits when the heat that utmost point ear 3 produced in the charge-discharge, makes the capacity of battery and utmost point ear 3's ability phase-match that overflows, the ability that overflows of reinforcing battery under heavy current operating condition. When the battery charges and discharges, because the current density of utmost point ear 3 department is the biggest, can produce a large amount of heat, show that 3 temperature of utmost point ear compare in the battery power generation district obviously risees, thereby can balance the temperature rise of calorific capacity effective control utmost point ear 3 department of battery under heavy current operating condition through the size of control utmost point ear 3, do benefit to laminate polymer battery's heat dissipation simultaneously, improve the battery security.
When the sizes of the positive and negative electrode lugs are designed according to the heat production and temperature control requirements of the lugs 3, the size of the required lead-out lug area 2 can be calculated according to the theoretical capacity of the single positive plate 7, and the sizes of the positive and negative electrode lugs can be obtained according to the theoretical capacity of a battery cell.
The process of calculating the lead-out tab region 2 is as follows:
the cross section area S of the lead-out tab area 2 is related to the size of a pole piece and the magnitude of charge and discharge current, so the area of the lead-out tab area 2 can be calculated by the following formula,
the calculation formula of the cross-sectional area S of the lead-out tab region 2 is as follows:
theoretical capacity C of single positive plate 7 in battery cellAThe calculation formula is as follows:
CA＝L*W*t*DC*CP (2)
according to the theoretical capacity C of the single positive plate 7 in the battery cellAAnd calculating the theoretical capacity C of the battery cell according to the stacking number f of the battery cells as follows:
C＝CA*f (3)
wherein L is the length of the pole piece and is mm;
w is the width of the pole piece, mm;
t is the active material thickness, mm;
Dcfor compacting density, g/cm3；
CPIs active material gram capacity, mAh/g;
CAthe theoretical capacity, Ah, of the single positive plate;
c is the theoretical capacity of the battery cell, Ah;
dguiding deviceThe thickness of the tab leading-out area is mm;
lguiding deviceThe width of the tab leading-out area is mm;
i is the maximum charge-discharge current, A;
Immaximum safe current that can be passed per unit area, Im(Al) is 3 to 5A/mm2；Im(Cu) is 5 to 8A/mm2；
f is the number of lamination layers of the battery core, and it should be noted that f is the number of stacked positive plates 7 and the number of stacked negative plates 8.
The size of the lead-out lug area 2 can be calculated through the formula, the width of the lead-out lug area 2 is 30-1300 mm, the length of the lead-out lug area 2 is determined according to the actual situation, and the lead-out lug area 2 can be selected within 10-60 mm.
The process of calculating the tab 3 is as follows:
when the battery works with large current, the current density at the position of the lug 3 is high, the lug 3 generates heat seriously, and when the lug 3 rises to a certain temperature, the sealing performance of the aluminum-plastic film can be influenced. According to joule's law:
Q＝I2Rt＝mCΔT (3)
m＝ω*L*S (5)
according to the formula (3), the formula (4) and the formula (5), the calculation formula which can be derived to obtain the cross-sectional area S of the tab is as follows:
wherein t is time, s;
r is the internal resistance of the tab and omega;
delta T is the change temperature of the tab, DEG C;
i is the current passing through the tab, A;
q is the heat generated in the time t, J;
ρ is the resistivity, ρAlIs 2.65X 10-8Ω·m，ρCuIs 1.72X 10-8Ω·m；
C is the specific heat capacity of the material, CAlIs 0.88X 103J/Kg·℃，CCuIs 0.39X 103J/Kg·℃；
Omega is density, omegaAlIs 2.7X 103Kg/m3，ωCuIs 8.9 multiplied by 103Kg/m3；
S is the cross section area of the pole ear in mm2；
L is the width of the tab, mm.
The size of the tab 3 of the battery cell can be calculated through the formula, the width of the tab 3 can be calculated to be 30-1000 mm, the thickness of the tab 3 is the thickness of an incoming aluminum belt or copper belt, the thickness of the tab is 0.08-1.0 mm, the length of the tab 3 is determined according to the actual condition of the battery cell, and the tab can be selected within the range of 40-150 mm.
The above calculation process is described below by some specific examples.
Example 1
The thickness of the first battery cell is 16mm, and the length of the pole piece and the width of the pole piece are 600mm and 350 mm;
thickness of Al current collector: 18 μm (15 μm aluminum foil +3 μm carbon coating)
Thickness of a Cu current collector: 8 μm
Thickness of the diaphragm: 16 μm
Positive plate thickness (double-side rolling): 0.145 +/-0.002 mm, positive electrode active material double-sided coating active material thickness t: 0.124mm
Thickness of the negative electrode sheet (double-sided secondary rolling): 0.098 +/-0.002 mm
CP(LFP) gram volume: 160 mAh/g; dc(LFP) compacted density: 2.3g/cm3
The maximum current I allowed to pass for a long time when the current density is allowed to guide the unit area S of the battery cellmThe basic value: i ism(Al) is 3-5A/mm2；Im(Cu) is 5 to 8A/mm2；
The lamination number f of the battery core is 62.
Calculating the theoretical capacity C of the single positive plate of the first battery cell according to the formula (2)A9.58Ah, the values of the parameters in the formula (2) are L600 mm, W350 mm, t 0.124mm, DcIs 2.3g/cm3，CPIs 160 mAh/g.
The theoretical capacity C of the battery cell is 594Ah calculated according to the formula (3), and the numerical value of each parameter in the formula (3) is CA9.58Ah, f is 62.
When the charge-discharge multiplying power is 1C, the maximum charge-discharge current I born by the tab leading-out area 2 is 9.58A, the maximum charge-discharge current of the tab 3 is 594A, and the design size l of the tab leading-out area on the positive and negative pole pieces is determined according to a formula (1)Guiding deviceRespectively as follows:
size of positive electrode tab extraction region:
Im(Al) is 3A/mm2，dGuiding deviceThe thickness of the Al current collector is 15 μm, the lead-out positive electrode tab region 2 of the positive electrode plate 7 isGuiding device212.9 mm.
Size of extracted negative electrode tab region of negative electrode:
Im(Cu) is 5A/mm2，dGuiding deviceIs the thickness of the Cu current collector is 8 mu m, the lead-out negative electrode tab area 2 of the negative electrode sheet 8Guiding deviceIs 239.5 mm.
And when the temperature of the tabs is increased from 25 ℃ to 65 ℃, the cross-sectional areas of the positive and negative tabs are calculated according to the formula (6) according to the size design requirements of the positive and negative tabs.
Wherein, the first and the second end of the pipe are connected with each other,the time t is the time required when the temperature of the lug is increased from 25 ℃ to 65 ℃, is 240s, and the current I passing through the lug is the maximum charge-discharge current 594A during charge-discharge of 1C. Calculating to obtain the cross-sectional area S of the pole lugPositive tabIs 153.66mm2，SNegative electrode tabIs 102.42mm2。
The thickness of the incoming materials of the positive tab 5 and the negative tab 6 is 0.6mm, the width of the positive tab 5 is 256.1mm, and the width of the negative tab 6 is 170.7 mm.
Therefore, in the first battery cell, the positive electrode tab and the negative electrode tab with the width of 260mm and the length of 60mm can be selected, or the positive electrode tab with the width of 260mm and the length of 60mm and the negative electrode tab with the width of 180mm and the length of 60mm can be selected.
Example 2
The thickness of the second battery cell is 16mm, and the length of the pole piece and the width of the pole piece are L, W and 700mm, 400 mm;
thickness of Al current collector: 18 μm (15 μm aluminum foil +3 μm carbon coating)
Thickness of a Cu current collector: 8 μm
Thickness of the diaphragm: 16 μm
Positive plate thickness (double-side rolling): 0.145 +/-0.002 mm, positive electrode active material double-sided coating active material thickness t: 0.124mm
Thickness of the negative electrode sheet (double-sided secondary rolling): 0.098 +/-0.002 mm
CP(LFP) gram volume: 160 mAh/g; dc(LFP) compacted density: 2.3g/cm3
The maximum current I allowed to pass for a long time when the current density is allowed to guide the unit area S of the battery cellmThe basic value: i ism(Al) is 3-5A/mm2；Im(Cu) is 5 to 8A/mm2；
The lamination layer number f of the battery core is 62.
Calculating the theoretical capacity C of the single positive plate of the second battery cell according to the formula (2)A12.77Ah, values of the parameters in the formula (2) are L of 700mm, W of 400mm, t of 0.124mm, DcIs 2.3g/cm3，CPIs 160 mAh/g.
Calculating the theoretical capacity C of the battery cell according to the formula (3)791.7Ah, the numerical value of each parameter in the formula (3) is CA12.77Ah, f is 62.
When the charge-discharge multiplying power is 0.5C, the maximum charge-discharge current I borne by the lead-out lug area is 6.38A, the maximum charge-discharge current of the lug is 395A, and the design size l of the lead-out lug area on the positive and negative pole pieces is determined according to a formula (1)Guiding deviceRespectively as follows:
size of positive electrode tab extraction region:
Im(Al) is 3A/mm2，dGuiding deviceThe thickness of the Al current collector is 15 μm, the lead-out positive electrode tab region 2 of the positive electrode plate 7 isGuiding device141.7 mm.
Size of extracted negative electrode tab region of negative electrode:
Im(Cu) is 5A/mm2，dGuiding deviceIs the thickness of the Cu current collector is 8 mu m, the lead-out negative electrode tab area 2 of the negative electrode sheet 8Guiding deviceAnd 159.5 mm.
And when the temperature of the tabs is increased from 25 ℃ to 65 ℃, the cross-sectional areas of the positive and negative tabs are calculated according to the formula (6) according to the size design requirements of the positive and negative tabs.
Wherein the time t is the time required by the lug to rise from 25 ℃ to 65 ℃, is 300s, and the current I passing through the lug is the maximum charge-discharge current 395A during charge-discharge of 0.5C. Calculating to obtain the cross-sectional area S of the pole lugPositive tabIs 114.24mm2，SNegative electrode tabIs 76.14mm2。
The thickness of the incoming material of the positive tab 5 and the negative tab 6 is 0.6mm, the width of the positive tab 5 is 190.4mm, and the width of the negative tab 6 is 126.9 mm.
Therefore, the positive electrode tab and the negative electrode tab of the second battery cell, which have a width of 200mm and a length of 40mm, may be selected, or the positive electrode tab of the second battery cell, which has a width of 200mm and a length of 40mm, and the negative electrode tab of the second battery cell, which has a width of 130mm and a length of 40mm, may be selected.
Example 3
The thickness of the battery cell III is 16mm, and the length of the pole piece and the width of the pole piece are L, W and 600mm, 350 mm;
thickness of Al current collector: 18 μm (15 μm aluminum foil +3 μm carbon coating)
Thickness of the Cu current collector: 8 μm
Thickness of the diaphragm: 16 μm
Positive plate thickness (double-side rolling): 0.145 +/-0.002 mm, positive electrode active material double-sided coating active material thickness t: 0.124mm
Thickness of the negative electrode sheet (double-sided secondary rolling): 0.098 +/-0.002 mm
CP(LFP) gram volume: 160 mAh/g; dc(LFP) compacted density: 2.3g/cm3
The maximum current I allowed to pass for a long time when the current density is allowed to guide the unit area S of the battery cellmThe basic value: I.C. Am(Al) is 3-5A/mm2；Im(Cu) is 5 to 8A/mm2；
The lamination layer number f of the battery core is 62.
Calculating the theoretical capacity C of the single positive plate 7 of the third battery cell according to the formula (2)A9.58Ah, the values of the parameters in the formula (2) are L600 mm, W350 mm, t 0.124mm, DcIs 2.3g/cm3，CPIs 160 mAh/g.
The theoretical capacity C of the battery cell is 594Ah calculated according to the formula (3), and the numerical value of each parameter in the formula (3) is CA9.58Ah, f is 62.
When the charge-discharge multiplying power is 0.25C, the maximum charge-discharge current I borne by the lead-out lug area is 2.395A, the maximum charge-discharge current of the lug is 148.5A, and the design size l of the lead-out lug area on the positive and negative pole pieces is determined according to a formula (1)Guiding deviceRespectively as follows:
size of positive electrode tab extraction region:
Im(Al) is 3A/mm2，dGuiding deviceThe thickness of the Al current collector is 15 μm, the lead-out positive electrode tab region 2 of the positive electrode plate 7 isGuiding deviceIs 53.2 mm.
Size of extracted negative electrode tab region of negative electrode:
Im(Cu) is 5A/mm2，dGuiding deviceIs the thickness of the Cu current collector is 8 mu m, the lead-out negative electrode tab area 2 of the negative electrode sheet 8Guiding deviceAnd 59.87 mm.
And when the temperature of the tabs is increased from 25 ℃ to 65 ℃, the cross-sectional areas of the positive and negative tabs are calculated according to the formula (6) according to the size design requirements of the positive and negative tabs.
Wherein the time t is the time required by the lug to rise from 25 ℃ to 65 ℃, the time t is 600s, and the current I passing through the lug is the maximum charge-discharge current 148.5A during charge-discharge of 0.25C. Calculating to obtain the cross-sectional area S of the pole lugPositive tabIs 60.73mm2，SNegative electrode tabIs 40.53mm2。
The incoming material thickness of the positive electrode tab 5 and the negative electrode tab 6 is 0.8mm, the width of the positive electrode tab 5 is 75.91mm, and the width of the negative electrode tab 6 is 50.66 mm.
Therefore, the positive electrode tab and the negative electrode tab with the width of 80mm and the length of 40mm can be selected from the third battery cell, or the positive electrode tab with the width of 80mm and the length of 40mm and the negative electrode tab with the width of 60mm and the length of 40mm can be selected.
Example four
The thickness of the battery cell four is 16mm, and the length of the pole piece and the width of the pole piece are L, W and 700mm, 400 mm;
thickness of Al current collector: 18 μm (15 μm aluminum foil +3 μm carbon coating)
Thickness of a Cu current collector: 8 μm
Thickness of the diaphragm: 16 μm
Positive plate thickness (double-side rolling): 0.145 +/-0.002 mm, positive electrode active material double-sided coating active material thickness t: 0.124mm
Thickness of the negative electrode sheet (double-sided secondary rolling): 0.098 +/-0.002 mm
CP(LFP) gram volume: 160 mAh/g; dc(LFP) compacted density: 2.3g/cm3
The maximum current I allowed to pass for a long time when the current density is allowed to guide the unit area S of the battery cellmThe basic value: i ism(Al) is 3-5A/mm2；Im(Cu) is 5 to 8A/mm2；
The lamination layer number f of the battery core is 62.
In the fourth battery cell, the width of the tab leading-out area is equal to that of the coating area, and the width of the tab leading-out area is equal to that of the current collector.
Region of positive electrode from which positive tab is ledGuiding device700mm, of the area of the negative electrode from which the negative electrode tab is drawnGuiding deviceIs 700 mm.
Calculating the theoretical capacity C of the single positive plate 7 of the battery cell four according to the formula (2)A12.77Ah, values of the parameters in the formula (2) are L of 700mm, W of 400mm, t of 0.124mm, DcIs 2.3g/cm3，CPIs 160 mAh/g.
Calculating the theoretical capacity C of the battery cell to be 791.7Ah according to the formula (3), wherein the numerical value of each parameter in the formula (3) is CAIt was 12.77Ah, and f was 62.
When the charge-discharge multiplying power is 0.5C, the maximum charge-discharge current I required to be borne by the tab leading-out region is 6.38A, and the maximum charge-discharge current of the tab is 395A.
And when the temperature of the tabs is increased from 25 ℃ to 65 ℃, the cross-sectional areas of the positive and negative tabs are calculated according to the formula (6) according to the size design requirements of the positive and negative tabs.
Wherein the time t is the time required by the lug to rise from 25 ℃ to 65 ℃, is 300s, and the current I passing through the lug is the maximum charge-discharge current 395A during charge-discharge of 0.5C. Calculating to obtain the cross-sectional area S of the pole lugPositive tabIs 114.24mm2，SNegative electrode tabIs 76.14mm2。
The thickness of the incoming material of the positive tab 5 and the negative tab 6 is 0.6mm, the width of the positive tab 5 is 190.4mm, and the width of the negative tab 6 is 126.9 mm.
Therefore, in the fourth battery cell, the positive electrode tab and the negative electrode tab with the width of 200mm and the length of 40mm can be selected, or the positive electrode tab with the width of 200mm and the length of 40mm and the negative electrode tab with the width of 130mm and the length of 40mm can be selected.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A pole piece and pole lug connection structure is characterized by comprising a pole piece and a pole lug;
the pole piece comprises a coating area and an uncoated lead-out pole lug area, the lead-out pole lug area is arranged on one side of the coating area, and the width of the lead-out pole lug area is less than or equal to that of the coating area; the tab is connected to the lead-out tab area, and the tab extends away from the paint area.
2. The pole piece tab connection of claim 1 wherein the width of the tab exit area is greater than the width of the tab.
3. The pole piece and tab connection structure of claim 2 wherein the tab extraction area has a width of 30 to 1300mm and a length of 10 to 60 mm.
4. The pole piece and tab connection structure of claim 2, wherein the tab has a width of 30 to 1000mm, a thickness of 0.08 to 1.0mm and a length of 40 to 150 mm.
5. The pole piece and tab connection structure of claim 1 wherein the length of the pole piece is 300 to 3000 mm; the width of the pole piece is 100-1300 mm.
6. The utility model provides a soft packet of lithium ion battery, its characterized in that, lithium ion battery's electric core includes diaphragm, positive pole ear, negative pole ear, a plurality of positive plates, a plurality of negative pole pieces and any one of claims 1-5 pole piece utmost point ear connection structure, the diaphragm is located the positive plate with between the negative pole piece, the positive plate with between the positive pole ear and the negative pole piece with all pass through between the negative pole ear pole piece utmost point ear connection structure connects.
7. The soft-package lithium ion battery according to claim 6, wherein the positive electrode sheets, the negative electrode sheets and the separator are stacked, the number of the positive electrode sheets is 38-92, and the number of the negative electrode sheets is 38-92.
8. The soft-package lithium ion battery of claim 6, wherein the length of the cell is 300-3000 mm, the width of the cell is 100-1300 mm, and the thickness of the cell is 10-24 mm.
9. The soft-packaged lithium ion battery of claim 6, wherein the cell has first and second opposite ends along its length, the positive tab being located at the first end of the cell and the negative tab being located at the second end of the cell.
10. The soft-pack lithium ion battery of claim 6, wherein the cell has first and second opposing sides along its width, and the positive and negative tabs are located on either the first or second side of the cell.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115832632A (en) * | 2022-11-03 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Pole piece, electric core, battery and electric equipment |
| WO2023217251A1 (en) * | 2022-05-12 | 2023-11-16 | 比亚迪股份有限公司 | Battery, battery pack, and vehicle |
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2021
- 2021-11-30 CN CN202122999395.9U patent/CN216436077U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023217251A1 (en) * | 2022-05-12 | 2023-11-16 | 比亚迪股份有限公司 | Battery, battery pack, and vehicle |
| CN115832632A (en) * | 2022-11-03 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Pole piece, electric core, battery and electric equipment |
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