CN212571269U - Soft package lithium battery - Google Patents
Soft package lithium battery Download PDFInfo
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- CN212571269U CN212571269U CN202021453657.0U CN202021453657U CN212571269U CN 212571269 U CN212571269 U CN 212571269U CN 202021453657 U CN202021453657 U CN 202021453657U CN 212571269 U CN212571269 U CN 212571269U
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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 utility model is suitable for a battery field of making provides a soft packet of lithium cell, including battery body, anodal ear and negative pole ear. Positive tab and negative pole ear correspond fixed connection respectively on the positive plate and the negative plate of battery body, and positive tab and negative pole ear all stretch out battery body, and wherein, the length of positive tab equals the length of negative pole ear, and the width of positive tab is greater than the width of negative pole ear. The utility model provides a soft package lithium battery, on the one hand, sets up the length of positive tab to be equal to the length of negative pole ear to and set up the width of positive tab to be greater than the width of negative pole ear, can increase the welding area of positive tab and the positive plate of battery body, increased the radiating effect, avoided the technical problem of the high temperature that the radiating effect of positive tab and battery body welding department is not good; on the other hand, be convenient for distinguish anodal ear and negative pole ear, can improve the degree of distinguishing of anodal ear and negative pole ear, avoid the difficult technical problem who distinguishes of anodal ear and negative pole ear.
Description
Technical Field
The utility model belongs to the technical field of the battery is made, more specifically say, relate to a soft packet of lithium cell.
Background
The tab is a part of the soft package lithium ion battery, and the tab is a metal conductor for leading out the positive electrode and the negative electrode from the battery core. Lithium ion battery can produce certain heat at the charge-discharge in-process, especially can produce a large amount of heats at lithium ion battery internal portion in the in-process of heavy current charge-discharge, and the utmost point ear department heat production is more especially.
The conventional lithium battery has the advantages that the length and the width of the positive and negative electrode tabs are generally the same, and the thickness of the positive electrode tab is slightly thicker than that of the negative electrode tab in order to balance the heat production rate and the heat dissipation effect of the positive and negative electrode tabs as much as possible. However, the welded joint of the tab and the battery cell still has the problems of poor heat dissipation effect and influence on the battery performance due to overhigh temperature, and the design that the positive and negative tabs are made to have the same length and width is inconvenient to distinguish, which may cause the risk of raw material waste or even material corrosion due to welding errors.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a soft packet of lithium cell to solve the not good and not convenient for distinguish the technical problem of positive negative pole utmost point ear radiating effect among the current soft packet of lithium cell.
In order to achieve the above object, the utility model adopts the following technical scheme: there is provided a soft-packed lithium battery comprising:
a battery body;
the positive lug is fixedly connected to the positive plate of the battery body and extends out of the battery body; and
the negative electrode lug is fixedly connected to the negative electrode piece of the battery body and extends out of the battery body;
the length of the positive tab is equal to that of the negative tab, and the width of the positive tab is larger than that of the negative tab.
By adopting the technical scheme, on one hand, the length of the positive tab is set to be equal to that of the negative tab, and the width of the positive tab is set to be larger than that of the negative tab, so that the welding area of the tab and a pole piece of the battery body can be increased, the heat dissipation effect is increased, and the technical problem of overhigh temperature caused by poor heat dissipation effect at the welding position of the tab and the pole piece of the battery body is solved; on the other hand, the width of positive tab is different with the width of negative pole ear, is more convenient for distinguish positive tab and negative pole ear, can improve the degree of distinguishing of positive tab and negative pole ear, avoids the difficult technical problem who distinguishes of positive tab and negative pole ear.
Optionally, the thickness of the positive tab is equal to the thickness of the negative tab.
By adopting the technical scheme, the thickness of the positive electrode lug is set to be equal to that of the negative electrode lug, so that the overcurrent capacity of the positive electrode lug and the negative electrode lug is not influenced.
Optionally, the current-carrying capacity of the positive tab and the current-carrying capacity of the negative tab satisfy: l1 × H1 × W1 × positive tab unit current capacity — L2 × H2 × W2 × negative tab unit current capacity; wherein L1 is the length value of the positive tab, H1 is the thickness value of the positive tab, W1 is the width value of the positive tab, L2 is the length value of the negative tab, H2 is the thickness value of the negative tab, and W2 is the width value of the negative tab.
By adopting the technical scheme, the current-carrying capacity of the positive tab and the current-carrying capacity of the negative tab further satisfy the condition that the unit current-carrying capacity of the positive tab is L1 × H1 × W1 × the unit current-carrying capacity of the positive tab is L2 × H2 × W3 × the unit current-carrying capacity of the negative tab, and the overcurrent capacity of the positive tab and the overcurrent capacity of the negative tab can be ensured to be the same.
Optionally, the length of the positive electrode tab and the negative electrode tab is 15-19mm, and the thickness of the positive electrode tab and the negative electrode tab is 0.1-0.3 mm.
By adopting the technical scheme, the lengths of the positive electrode lug and the negative electrode lug are set in the range, so that the overcurrent capacity is ensured, the lengths are short, and the welding effect is difficult to ensure; if the length is too long, the thickness of the tab is thin, and the structure of the whole lithium battery and the space utilization rate during assembly are affected;
the encapsulation between the thickness of utmost point ear and the plastic-aluminum membrane is mainly considered, if too thick can influence the encapsulation with the plastic-aluminum membrane for battery body's encapsulation effect is not good, and is too thin, can lead to the width of whole battery bigger, influences whole battery body's mechanism and space utilization.
Optionally, the difference between the width of the positive tab and the width of the negative tab is 7.5-22.5.
Through adopting above-mentioned technical scheme, the broadband of anodal ear is greater than the width of negative pole ear, and in above-mentioned within range, when guaranteeing the overcurrent capacity of anodal ear and the overcurrent capacity of negative pole ear, has guaranteed the radiating effect preferred, and it is too little to differ, influences the radiating effect, and it is too big to differ, and the width that can make anodal ear is great, and the width of negative pole ear is less, influences the structure and the space utilization of whole battery.
Optionally, the positive tab and the negative tab are located at the same end of the battery body.
By adopting the technical scheme, the positive tab and the negative tab are both positioned at the same end part of the battery body, so that the overall size of the battery is smaller, and the small battery with low multiplying power can be satisfied for a winding type lithium battery; it is also possible to satisfy a lithium battery of a laminated structure.
Optionally, the positive electrode tab and the negative electrode tab are symmetrically arranged along the center line of the battery body.
By adopting the technical scheme, the positive electrode lug and the negative electrode lug are symmetrically arranged along the central line of the battery body, so that the wires can be conveniently led out from the same side, and the connection with the outside is simpler.
Alternatively, the positive electrode tab and the negative electrode tab are provided at opposite ends of the battery body, respectively.
By adopting the scheme, the anode lug and the cathode lug are respectively arranged at the two opposite ends of the battery body, so that the battery model with large length-width ratio can be satisfied, and the purpose of uniform current distribution can be satisfied while large-current discharge is achieved.
Optionally, the positive tab and the negative tab are respectively arranged at the middle positions of the two opposite end parts of the battery body; or the positive electrode lug and the negative electrode lug are respectively arranged at two top points of a diagonal line of the battery body.
By adopting the technical scheme, the positive electrode lug and the negative electrode lug are respectively arranged at the middle positions of the two opposite end parts of the battery body, so that the temperature distribution is further more uniform.
The positive electrode lug and the negative electrode lug are respectively arranged at two top points of a diagonal line of the battery body, so that the highest temperature of the whole lithium battery is lower.
Optionally, the positive tab comprises a first conductive part, a second conductive part connected with the first conductive part, and a first tab glue sleeved at a joint of the first conductive part and the second conductive part, and the first conductive part or the second conductive part is fixedly connected with the positive plate;
the negative electrode tab comprises a third conductive part, a fourth conductive part connected with the third conductive part and a second tab glue sleeved at the joint of the third conductive part and the fourth conductive part, and the third conductive part or the fourth conductive part is fixedly connected with the negative electrode piece.
By adopting the technical scheme, the first tab glue and the second tab glue are adopted, so that the positive tab and the negative tab are conveniently melted and welded on the corresponding positive plate and the negative plate during welding.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic perspective view of a soft-packaged lithium battery according to a first embodiment of the present invention;
fig. 2 is a schematic perspective view of a soft-packaged lithium battery according to a second embodiment of the present invention;
fig. 3 is a schematic perspective view of a soft-packaged lithium battery according to a third embodiment of the present invention;
fig. 4 is a schematic perspective view of a positive tab provided in an embodiment of the present invention;
fig. 5 is a schematic perspective view of a negative electrode tab according to an embodiment of the present invention;
fig. 6 is a schematic perspective view of a battery body, a positive tab and a negative tab provided in an embodiment of the present invention;
fig. 7 is a schematic view of a three-dimensional structure of a lithium battery provided by an embodiment of the present invention during packaging.
Wherein, in the figures, the respective reference numerals:
1-a battery body; 11-positive plate; 12-negative pole piece; 13-a separator; 2, positive tab; 21-a first conductive portion; 22-a second conductive portion; 23-first tab glue; 3-negative pole ear; 31-a third conductive portion; 32-a fourth conductive portion; 33-second ear glue; 4-aluminum plastic film; l1 — length of positive tab; h1-thickness of positive tab; w1-width of Positive tab; l2 — length of negative tab; h2 — thickness of negative electrode tab; w2 — width of negative tab; l3-center line of the cell body; l4-diagonal of the cell body; l5-heat seal line.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be 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.
It will be understood that when an element is referred to as being "fixedly disposed" or "disposed" on another element, it can be directly on the other element or be indirectly connected to the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The meaning of "plurality" is two or more unless specifically limited otherwise.
The first embodiment is as follows:
referring to fig. 1, fig. 4, fig. 5 and fig. 6, a soft-packed lithium battery according to an embodiment of the present invention will now be described. The soft package lithium battery comprises a battery body 1, a positive tab 2 and a negative tab 3. Anodal ear 2 and the equal fixed connection of negative pole ear 3 are on battery body 1, and anodal ear 2 and negative pole ear 3 all stretch out battery body 1 setting. The positive tab 2 is fixed on the positive plate 11 of the battery body 1, the negative tab 3 is fixed on the negative plate 12 of the battery body 1, the length L1 of the positive tab 2 is equal to the length L2 of the negative tab 3, and the width W1 of the positive tab 2 is greater than the width W2 of the negative tab 3.
Compared with the prior art, the soft package lithium battery provided by the embodiment of the utility model, on the one hand, set length L1 of positive tab 2 to be equal to length L2 of negative tab 3, and set width W1 of positive tab 2 to be greater than width W2 of negative tab 3, can increase the welding area of positive tab 2 and battery body 1, increase the radiating effect, avoid the technical problem of too high temperature caused by poor radiating effect of positive tab 2 and battery body 1 welding place; on the other hand, the width W1 of the positive tab 2 is different from the width W2 of the negative tab 3, so that the positive tab 2 and the negative tab 3 can be more conveniently distinguished, the distinguishing degree of the positive tab 2 and the negative tab 3 can be improved, and the technical problem that the positive tab 2 and the negative tab 3 are not easy to distinguish is solved.
In the embodiment of the present invention, further referring to fig. 1, the positive tab 2 and the negative tab 3 are located at the same end of the battery body 1, i.e. the positive tab 2 and the negative tab 3 are led out in the same direction, mainly determined according to the structure of the product and the power of the battery, and the tab can be selected from the same direction for the small battery of the winding type and the low rate, and of course, the tab can also be selected from the same side for the battery structure of the stacked body. The lamination mode is equivalent to the parallel connection of dozens of small batteries, so that the ohmic internal resistance of the battery is greatly reduced, and the rate capability of the battery is far better than that of the winding mode.
Specifically, in the present embodiment, the positive electrode tab 2 and the negative electrode tab 3 are symmetrically disposed along the center line L3 of the battery body 1, which facilitates manufacturing, facilitates wire outgoing on the same side, and makes wiring with the outside relatively simple.
Referring to fig. 4 to 6, the battery body 1 includes a positive electrode sheet 11, a separator 13, and a negative electrode sheet 12, wherein the positive electrode sheet 11, the separator 13, and the negative electrode sheet 12 are stacked to form a laminated sheet, the laminated sheet can be wound to form a wound body, the separator 13 is disposed between the adjacent positive electrode sheet 11 and negative electrode sheet 12 in the wound body, the positive electrode tab 2 is fixedly connected to the positive electrode sheet 11, and the negative electrode tab 3 is fixedly connected to the negative electrode sheet 12. The positive tab 2 and the negative tab 3 are fixed to the positive plate 11 and the negative plate 12, respectively, wherein the fixing manner is not limited to the laser welding or the ultrasonic welding. By setting the width W1 of the positive tab 2 to be greater than the width W2 of the negative tab 3, the welding area of the positive tab 2 is made larger, and the heat dissipation effect is better. The negative electrode tab 3 may be a negative electrode tab 3 having a conventional size, which is not limited herein.
In the first embodiment of the present invention, further referring to fig. 4 and 5, the positive tab 2 includes a first conductive portion 21, a second conductive portion 22 connected to the first conductive portion 21, and a first tab glue 23 sleeved at the joint of the first conductive portion 21 and the second conductive portion 22, and the first conductive portion 21 or the second conductive portion 22 is fixedly connected to the battery body 1.
The negative electrode tab 3 includes a third conductive portion 31, a fourth conductive portion 32 connected to the third conductive portion 31, and a second tab compound 33 interposed between the third conductive portion 31 and the fourth conductive portion 32, and the third conductive portion 31 or the fourth conductive portion 32 is fixedly connected to the battery body 1. By adopting the first tab glue 23 and the second tab glue 33, the battery body 1 is convenient to seal when the battery is packaged.
In the manufacturing process of the pouch battery in this embodiment, referring to fig. 7 further, after the wound battery body 1 is obtained, the battery body 1 is packaged by the aluminum-plastic film 4, that is, concave positions are respectively stamped on the aluminum-plastic film 4, the size of the battery body 1 wound by the concave positions is adapted, when the pouch lithium battery is packaged, the wound battery body 1 is placed into the concave positions, the positive tab 2 and the negative tab 3 are respectively fixed relatively to a predetermined position on the casing of the aluminum-plastic film 4 according to preset process requirements, and the lithium battery is packaged by the heat-sealing line L5.
In the first embodiment of the present invention, further referring to fig. 4 and 5, the thickness H1 of the positive tab 2 is equal to the thickness H2 of the negative tab 3, and the current-carrying capacity of the positive tab 2 and the current-carrying capacity of the negative tab 3 satisfy: l1 × H1 × W1 × positive electrode tab 2 unit current capacity — L2 × H2 × W3 × negative electrode tab 3 unit current capacity, where positive electrode tab 2 unit current capacity refers to current capacity per unit area, and negative electrode tab 3 unit current capacity refers to current capacity per unit area. Wherein, L1 is the length value of the anodal tab 2, H1 is the thickness value of the anodal tab 2, and W1 is the width value of the anodal tab 2; l2 is the length of the negative electrode tab, H2 is the thickness of the negative electrode tab, and W2 is the width of the negative electrode tab 3.
This embodiment is combined with the above embodiment in which the length L1 of the positive tab 2 is equal to the length L2 of the negative tab 3, the width W1 of the positive tab 2 is greater than the width W2 of the negative tab 3, and the specific size of the tab is accounted for by the capacity of the battery, typically 1mm2The current-carrying capacity of the aluminum positive electrode of (2) is 7.5A, 1mm2The current-carrying capacity of the copper cathode is 11.25A, for example, 10Ah batteries of EV (Electric Vehicle) automobiles need to meet 3C (30A) discharge conditions, aluminum tabs with the cross-sectional area of 4mm2 and nickel plated copper tabs with the cross-sectional area of 2.5mm2 need to be used, 5Ah batteries for HEV (Hybrid Electric Vehicle) automobiles need to meet 30C (150A) discharge conditions, and 34mm cross-sectional area needs to be used2And 25mm of aluminum tab2The copper tab.
In this example, the length, width and thickness of the negative electrode tab 3 (copper tab) are 48.5mm × 45mm × 0.3mm, and the length L1 and height of the positive electrode tab 2 are 48.5mm × 0.3mm, respectively, so that the W1 becomes 67.5mm from 48.5 × 45 × 0.3 × 11.25 to 48.5W 1 × 0.3 × 7.5;
of course, in other embodiments, L1 ═ L2 ═ 48.5mm, H1 ═ H2 ═ 0.3mm, W1 ═ 22.5mm, and W2 ═ 15mm, depending on the current capacity.
In the first embodiment of the present invention, referring to fig. 4 and 5, the difference between the width W1 of positive tab 2 and the width W2 of negative tab 3 is 7.5-22.5 mm. In a specific application, the difference between width W1 of positive tab 2 and width W2 of negative tab 3 is 7.5mm, 8mm, 8.5mm, 9mm, 10mm, 10.5mm, 11mm, 11.5mm … … or 22.5 mm. The difference between the width W1 of the positive tab 2 and the width W2 of the negative tab 3 is within the above range, so that the heat dissipation effect of the positive and negative tabs 3 is good while the overcurrent capacity of the positive tab 2 and the negative tab 3 is the same. The problem that the structure and the space utilization rate of the whole lithium battery are affected due to the fact that the width W1 of the positive tab 2 is greatly different from the width W2 of the negative tab 3, the width W1 of the positive tab 2 is large, and the width W2 of the negative tab 3 is small is avoided; too small a phase difference affects the heat dissipation effects of the positive electrode tab 2 and the negative electrode tab 3.
In the first embodiment of the present invention, referring to fig. 4 and 5, the length of the positive tab 2 and the negative tab 3 is 15-19mm, and the thickness of the positive tab 2 and the negative tab 3 is 0.1-0.3 mm. In a specific application, the lengths of the positive electrode tab 2 and the negative electrode tab 3 are 15mm, 16mm, 17mm, 18mm or 19mm, and the thicknesses of the positive electrode tab 2 and the negative electrode tab 3 are 0.1mm, 0.2mm or 0.3 mm.
With the length setting of anodal ear 2 and negative pole ear 3 in this within range, guaranteed the ability of overflowing, when length is shorter, be difficult to guarantee utmost point ear and battery body 1 welded effect, length if partial length, can lead to the thickness of utmost point ear thinner, influence the structure of whole lithium cell to and space utilization when assembling.
Encapsulation between battery body 1 and plastic-aluminum membrane 4 is considered to the thickness of anodal ear 2 and negative pole ear 3, within the range of 0.1-0.3mm, the encapsulation effect is better, too thick can influence the encapsulation of battery body 1 and plastic-aluminum membrane 4, make the encapsulation effect of battery body 1 not good, it is too thin, when satisfying anodal ear 2 and negative pole ear 3's overcurrent capacity the same, will make just, the width of negative pole ear 3 is longer, influence the structure of whole lithium cell, and space utilization when assembling.
Example two:
the difference between the second embodiment and the first embodiment is that: the positive electrode tab 2 and the negative electrode tab 3 are provided at opposite ends of the battery body 1, respectively. Referring specifically to fig. 2, for a high-rate laminated structure, it is necessary to select the positive electrode tab 2 and the negative electrode tab 3 that protrude in opposite directions. The lithium battery with a winding structure can be additionally welded with a plurality of tabs on an electrode tab, so that at the initial stage of high-rate discharge, a plurality of regions inside the battery have small internal resistance, high current density and high reaction speed, and severe reaction under the condition of single-electrode tabs is relieved. However, the adoption of multiple tabs can reduce the rated capacity of the battery, and if the number of the tabs is increased, the heat sealing difficulty of the aluminum-plastic film 4 is increased, and the poor pre-sealing phenomenon is easy to occur between the aluminum-plastic film 4 and the tabs, so that the hidden troubles of short circuit, air expansion and liquid leakage of the battery are caused.
When the pole lugs are arranged on the same side, the X which is farthest from the pole lugsnThe current flowing out needs to pass through the front X1-XnThe electric quantity flowing out from the end, such as the section X3, is most required to pass through X1-X2-X3Segment … …, the external discharge current is I, the reaction current of each segment is Ia, then X flows1The current of the segment current collector is n Ia and flows through X2The current of the segment current collector is (n-1) Ia, … flows through XnThe current at the segment current collector is Ia.
In the present embodiment, positive electrode tab 2 and negative electrode tab 3 are provided at intermediate positions between opposite ends of battery body 1, and are symmetrically provided along center line L3 of battery body 1. The specific principle is as follows:
for each section of the current collector, wherein the current collector refers to a structure or part that collects current, i.e., a tab, the ohmic heat of the current passing through the current collector is calculated:
Qi＝Ii 2·Ri·t
Ri＝ρ·dx/A
in the formula: qiThe heat generated by each current collector during the time t, IiFor the current passing through each segment of current collector, RiResistance of each current collector;
ρ is the resistivity of the current collector, dx is the length of each segment, and a is the cross-sectional area of the current collector.
When the positive tab 2 and the negative tab 3 are located on the same side, the total heat Q on the current collector can be calculated by the following formula, and the heat equivalent internal resistance R on the current collector can be calculated.
Q＝Q1+Q2+…+Qn
When the positive electrode tab 2 and the negative electrode tab 3 are in the middle position on the opposite side, the equivalent thermal internal resistance of the current collector is calculated by using the heat integral.
Q＝2(Q1+Q2+…+Qn/2)
Comparing the two positions of the positive tab 2 and the negative tab 3, when the positive tab 2 and the negative tab 3 are respectively arranged at the middle positions of the opposite sides, the internal resistance of the current collector is only 1/4 when the current collector is on one side, and when the electrode width is constant, the internal resistance of the current collector is in direct proportion to the length. Therefore, in the present embodiment, the positive electrode tab 2 and the negative electrode tab 3 are provided at the middle positions between the opposite end portions of the battery body 1, respectively, and have a small internal resistance and a low temperature.
Example three:
the difference between the third embodiment and the second embodiment is that: the positive electrode tab 2 and the negative electrode tab 3 are provided at two apexes of a diagonal line L4 of the battery body 1, respectively. Referring to fig. 3 specifically, for the battery model with a large length-width ratio, if the tab is led out from the same side, the width of the tab is greatly limited, so that the requirement of the maximum discharge current of the battery cannot be met, at this time, the tab can be led out from the positive tab 2 and the negative tab 3 in the opposite direction, and when the large current is discharged, the current is uniformly distributed, the tabs are led out from both sides, the temperature is more uniformly distributed, the tabs are led out from the diagonal corners of both sides, and the highest temperature is lower, therefore, in this embodiment, the positive tab 2 and the negative tab 3 are respectively arranged at two top points of the diagonal line L4 of the battery body 1, that is, the connection line between the positive tab 2 and the negative tab 3 is located on the diagonal line L4 of the battery.
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 soft-packed lithium battery, comprising:
a battery body;
the positive lug is fixedly connected to the positive plate of the battery body and extends out of the battery body; and
the negative electrode lug is fixedly connected to the negative electrode piece of the battery body and extends out of the battery body;
the length of the positive tab is equal to that of the negative tab, and the width of the positive tab is larger than that of the negative tab.
2. The lithium pouch cell of claim 1, wherein: the thickness of the positive electrode tab is equal to that of the negative electrode tab.
3. The lithium pouch cell of claim 2, wherein: the current-carrying capacity of the positive tab and the current-carrying capacity of the negative tab meet the following requirements: l1 × H1 × W1 × positive tab unit current capacity — L2 × H2 × W2 × negative tab unit current capacity; wherein L1 is the length value of the positive tab, H1 is the thickness value of the positive tab, W1 is the width value of the positive tab, L2 is the length value of the negative tab, H2 is the thickness value of the negative tab, and W2 is the width value of the negative tab.
4. The lithium pouch cell of claim 2, wherein: the length of the positive electrode tab and the negative electrode tab is 15-19mm, and the thickness of the positive electrode tab and the negative electrode tab is 0.1-0.3 mm.
5. The lithium pouch cell of claim 1, wherein: the difference between the width of the positive electrode tab and the width of the negative electrode tab is 7.5-22.5 mm.
6. The lithium pouch cell of any of claims 1 to 5, characterized in that: the positive electrode lug and the negative electrode lug are positioned at the same end part of the battery body.
7. The lithium pouch cell of claim 6, wherein: the positive electrode lug and the negative electrode lug are symmetrically arranged along the central line of the battery body.
8. The lithium pouch cell of any of claims 1 to 5, characterized in that: the positive electrode lug and the negative electrode lug are respectively arranged at two opposite end parts of the battery body.
9. The lithium pouch cell of claim 8, wherein: the positive electrode lug and the negative electrode lug are respectively arranged in the middle positions of the two opposite end parts of the battery body; or the positive electrode lug and the negative electrode lug are respectively arranged at two top points of a diagonal line of the battery body.
10. The lithium pouch cell of any of claims 1-5, characterized by: the positive tab comprises a first conductive part, a second conductive part connected with the first conductive part and a first tab glue sleeved at the joint of the first conductive part and the second conductive part, and the first conductive part or the second conductive part is fixedly connected with the positive plate;
the negative electrode tab comprises a third conductive part, a fourth conductive part connected with the third conductive part and a second tab glue sleeved at the joint of the third conductive part and the fourth conductive part, and the third conductive part or the fourth conductive part is fixedly connected with the negative electrode plate.
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| CN202021453657.0U CN212571269U (en) | 2020-07-21 | 2020-07-21 | Soft package lithium battery |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113517435A (en) * | 2021-06-07 | 2021-10-19 | 江苏劲鹿新能源科技有限公司 | Low-temperature lithium battery formula and sheet-making process |
| CN113517436A (en) * | 2021-06-07 | 2021-10-19 | 江苏劲鹿新能源科技有限公司 | Continuous-rate lithium battery formula and sheet-making process thereof |
| CN114142181A (en) * | 2021-11-30 | 2022-03-04 | 蜂巢能源科技有限公司 | Battery core, battery core assembly method and battery |
| 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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2020
- 2020-07-21 CN CN202021453657.0U patent/CN212571269U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113517435A (en) * | 2021-06-07 | 2021-10-19 | 江苏劲鹿新能源科技有限公司 | Low-temperature lithium battery formula and sheet-making process |
| CN113517436A (en) * | 2021-06-07 | 2021-10-19 | 江苏劲鹿新能源科技有限公司 | Continuous-rate lithium battery formula and sheet-making process thereof |
| CN114142181A (en) * | 2021-11-30 | 2022-03-04 | 蜂巢能源科技有限公司 | Battery core, battery core assembly method and battery |
| 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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