CN216958434U - Battery cell and battery module - Google Patents
Battery cell and battery module Download PDFInfo
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- CN216958434U CN216958434U CN202220291834.2U CN202220291834U CN216958434U CN 216958434 U CN216958434 U CN 216958434U CN 202220291834 U CN202220291834 U CN 202220291834U CN 216958434 U CN216958434 U CN 216958434U
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- 239000011248 coating agent Substances 0.000 claims description 26
- 238000000576 coating method Methods 0.000 claims description 26
- 239000011888 foil Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 abstract description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 4
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000005253 cladding Methods 0.000 abstract description 3
- 210000004027 cell Anatomy 0.000 description 30
- 238000010586 diagram Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 210000002421 cell wall Anatomy 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 101100460844 Mus musculus Nr2f6 gene Proteins 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
The utility model relates to the technical field of batteries, in particular to a battery cell and a battery module. The battery cell comprises at least one core package comprising a positive tab and a negative tab. The positive plate is provided with a positive lug groove along the length direction, and the positive lug groove is provided with a positive lug which protrudes out of the positive lug groove; the negative pole piece is provided with a negative pole lug groove along the length direction, the negative pole lug groove is provided with a negative pole lug, and the negative pole lug protrudes out of the negative pole lug groove; the diaphragm is arranged between the positive plate and the negative plate. In the utility model, the positive tab protrudes out of the positive plate, the negative tab protrudes out of the negative plate, when the battery cell is arranged in the shell, the part of the tab higher than the pole piece is pressed by the battery cover, and the protruding part of the tab can be directly welded with the cover plate after being bent, thereby reducing the assembly process. Through the convex design of the positive plate and the negative plate, the space between the head part of the core cladding and the battery cover can be filled, so that the space is effectively utilized, the waste of the space is avoided, and the energy density of the lithium ion battery is improved.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a battery cell and a battery module.
Background
In the conventional battery module, a positive electrode tab is located at one end in the length direction, and a negative electrode tab is located at the other end in the length direction. In the charging and discharging process, electrons are converged on the pole columns at two ends through the base material, and part of electrons need to penetrate through the whole length direction, so that the internal resistance of the battery cell is increased. Meanwhile, the upper distribution area of the pole piece is far away from the pole lug, so that the risk of lithium precipitation in the area can be caused during high-power charging and discharging, and the application of the battery cell in the aspect of high-power charging and discharging is limited.
In the manufacturing process of the aluminum shell battery cell, the cover plate needs to be welded together with the lug or the lug is welded with the connecting sheet firstly, the connecting sheet is welded with the cover plate, and when the battery cell is assembled, the welding position is given by the inner part needing a reserved space so as to ensure that the welding area can not extrude the pole piece. In the prior art, the space is reserved not only at the welding position but also at the whole head part, and besides the actual occupation of the welding position, the space of other areas is wasted, so that the space utilization rate is not high.
Therefore, a battery cell is needed to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a battery cell and a battery module, which can utilize the internal space of a battery and improve the energy density of the battery.
In order to achieve the purpose, the utility model adopts the following technical scheme:
there is provided a battery cell comprising at least one core package, the core package comprising:
the positive plate is provided with a positive lug groove along the length direction, and the positive lug groove is provided with a positive lug which protrudes out of the positive lug groove;
the negative electrode tab is provided with a negative electrode tab groove along the length direction, and the negative electrode tab groove is provided with a negative electrode tab which protrudes out of the negative electrode tab groove;
and the diaphragm is arranged between the positive plate and the negative plate.
As a preferable technical solution of the battery cell, the length of the positive electrode ear groove is greater than the length of the negative electrode ear groove.
As a preferred technical solution of the above battery cell, the positive tab slot is disposed in the middle of the positive tab, and the negative tab slot is disposed in the middle of the negative tab.
As a preferred technical solution of the above battery electric core, the core package further includes a diaphragm, a groove corresponding to the negative electrode ear groove and the positive electrode ear groove is formed in the diaphragm, and a groove bottom of the groove is higher than a groove bottom of the negative electrode ear groove and a groove bottom of the positive electrode ear groove.
As a preferable technical scheme of the battery cell, the positive tab includes a positive coating area and a positive empty foil area, the positive coating area is located below the positive empty foil area, and the positive coating area is connected with the bottom of the positive tab groove.
As a preferred technical solution of the above battery cell, it is assumed that a distance d from the first side wall of the positive tab to the first groove wall of the positive tab groove is defined as1The width of the positive lug is e1The distance from the second side wall of the positive lug to the second groove wall of the positive lug is f1，f1＞ (d1+e1)。
As a preferable technical scheme of the battery cell, the negative electrode tab comprises a negative electrode coating area and a negative electrode empty foil area, the negative electrode coating area is located below the negative electrode empty foil area, and the negative electrode coating area is connected with the bottom of the negative electrode tab groove.
As a preferred technical solution of the above battery electric core, it is assumed that a distance from the second sidewall of the negative electrode tab to the second wall of the negative electrode tab is f2The width of the negative electrode tab is e2The distance from the first side wall of the negative electrode tab to the first groove wall of the negative electrode tab groove is d2，d2＞(f2+e2)。
As the above electricityThe preferable technical scheme of the battery cell is that the length of the positive plate is a1The length of the negative plate is a2The width of the positive plate is b1The width of the negative plate is b2，a1＜a2， b1＜b2。
The utility model also provides a battery module which comprises the battery cell in any scheme.
The utility model has the beneficial effects that:
in the utility model, the positive tab protrudes out of the positive plate, the negative tab protrudes out of the negative plate, when the battery cell is arranged in the shell, the part of the tab higher than the pole piece is pressed by the battery cover, and the protruding part of the tab can be directly welded with the cover plate after being bent, thereby reducing the assembly process. Through the convex design of the positive plate and the negative plate, the space between the head part of the core cladding and the battery cover can be filled, so that the space is effectively utilized, the waste of the space is avoided, and the energy density of the lithium ion battery is improved.
Drawings
Fig. 1 is a schematic structural diagram of a core package of a battery cell provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a positive plate of a battery cell provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a negative plate of a battery cell provided by an embodiment of the utility model;
fig. 4 is a schematic diagram of a dimension-labeled structure of a positive plate of a battery cell provided in an embodiment of the present invention;
fig. 5 is a schematic diagram of a dimensioning structure of a negative electrode plate of a battery cell provided in an embodiment of the present invention.
In the figure:
1. a positive plate; 11. a positive ear groove; 111. a positive first cell wall; 112. a positive second cell wall; 2. a positive tab; 21. a positive electrode empty foil region; 22. a positive coating region; 23. a first side wall of the positive tab; 24. a second side wall of the positive tab; 3. a negative plate; 31. a negative electrode lug groove; 311. a negative electrode first cell wall; 312. a second cell wall of the cathode; 4. a negative tab; 41. a negative empty foil region; 42. a negative coating region; 43. a negative tab first sidewall; 44. And a second sidewall of the negative tab.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not to be construed as limiting the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
In the prior art, in a battery cell of a lithium ion battery, a certain height difference exists between top walls of two tabs and edges of wound or stacked positive and negative pole pieces, and after the battery cell is installed in a battery case, an area corresponding to the height difference cannot be effectively utilized, so that space waste in the battery is caused, and the energy density of the battery is also reduced. In view of the above technical problems, an embodiment of the present invention provides a battery module, which includes a battery cell, and the battery cell can effectively utilize a spatial region of a height difference between a tab and a pole piece, improve a spatial utilization rate in the battery, and improve an energy density of the battery.
Specifically, embodiments of the present invention provide a battery cell including at least one core package, where the battery cell is composed of a single core package or a dual core package. As shown in fig. 1 to 3, each core pack includes a positive electrode tab 1, a negative electrode tab 3, and a separator disposed between the positive electrode tab 1 and the negative electrode tab 3 at an interval. The positive plate 1 is provided with a positive lug groove 11 along the length direction, the positive lug groove 11 is provided with a positive lug 2, and the positive lug 2 protrudes out of the positive lug groove 11; the negative electrode tab 3 is provided with a negative electrode tab slot 31 along the length direction, the negative electrode tab slot 31 is provided with a negative electrode tab 4, and the negative electrode tab 4 protrudes from the negative electrode tab slot 31. The lug protrudes out of the lug groove and is arranged in the lug groove, when the battery cell is arranged in the shell, the protruding part of the lug can be pressed down by the battery cover, and the part of the lug bent by the battery cover can be directly welded with the cover plate, so that the assembly process is reduced. Through the convex design of the positive plate 1 and the negative plate 3, the space between the head part of the core cladding and the battery cover can be filled, so that the space is effectively utilized, the space waste is avoided, and the energy density of the lithium ion battery is improved.
In addition, the lug protruding part can be directly welded with the battery cover, so that a connecting sheet is omitted, the equipment investment in the later period can be reduced, and the working procedure time can be shortened.
Optionally, in this embodiment, in order to ensure that the core package can work normally, the height of the positive ear slot 11 is greater than that of the negative ear slot 31.
Alternatively, the positive tab slot 11 is disposed along the length direction of the positive tab 1, the positive tab slot 11 is disposed in the middle of the positive tab 1, the negative tab slot 31 is disposed along the length direction of the negative tab 3, and the negative tab slot 31 is disposed in the middle of the negative tab 3. So set up, can make the electron at pole piece both ends flow to the route of utmost point ear shorten, the long then internal resistance of route that the electron flows to utmost point ear is big, and the route is short, then internal resistance is little, so the route shortens can show the upper limit that promotes the big multiplying power of electric core and charge-discharge, enriches the use scene of this electric core.
Optionally, the separator is provided with grooves corresponding to the negative electrode lug grooves 31 and the positive electrode lug grooves 11, the grooves can accommodate the partially bent part of the electrode lug after the electrode lug is bent, and the groove bottoms of the grooves are higher than those of the negative electrode lug grooves 31 and the positive electrode lug grooves 11, so that the electrode lug is prevented from being bent by a large amount to affect use.
Alternatively, in the present embodiment, the base material of the positive electrode sheet 1 is an aluminum foil. The positive tab 2 comprises a positive coating area 22 and a positive empty foil area 21, the positive coating area 22 is coated with positive coating, the positive empty foil area 21 is positioned above the positive coating area 22 along the height direction of the positive tab 2, and the positive coating area 22 is connected with the bottom of the negative positive tab groove 11. The positive electrode empty foil area 21 is bent towards the electric core direction and is directly welded with the battery cover, so that the step of welding the battery cover through a connecting sheet is omitted, and the assembly efficiency is improved.
Optionally, in this embodiment, the negative electrode sheet 3 substrate is a copper foil. The negative electrode tab 4 comprises a negative electrode coating area 42 and a negative electrode empty foil area 41, the negative electrode coating area 42 is coated with a negative electrode coating, the negative electrode empty foil area 41 is positioned above the negative electrode coating area 42 along the height direction of the negative electrode tab 4, and the negative electrode coating area 42 is connected with the bottom of the negative electrode tab groove 31. The negative electrode empty foil area 41 is directly welded with the battery cover, and the negative electrode empty foil area can be directly welded with the battery cover without adding a connecting sheet, so that steps are saved, and the assembly efficiency is improved.
As shown in fig. 4 and 5, after the positive electrode tab 1 and the negative electrode tab 3 are stacked, the positive electrode tab 2 and the negative electrode tab 4 are spaced apart from each other, and for this reason, in the present embodiment, positive electrode tab 3 is providedThe distance d from the first side wall 23 of the positive electrode tab 2 to the first groove wall 111 of the positive electrode tab groove 111The width of the positive tab 2 is e1The distance from the second side wall 24 of the positive tab 2 to the second groove wall 112 of the positive tab groove 11 is f1，f1＞(d1+e1). So set up and be used for fixing a position anodal ear 2, avoid anodal ear 2 and the contact of negative pole ear 4 to lead to the short circuit after anodal piece 1 and 3 coincide of negative pole pieces. In one embodiment, to accommodate the opening of the positive tab slot 11, the size of the positive tab 1 is limited, for example, the width b of the positive tab 11，b1Less than 50mm, the length of the positive plate 1 is a1， 10≤a1/b1Is less than or equal to 100. In one embodiment, the distance from the second side wall 24 of the positive tab to the short side of the positive tab adjacent to the second side wall 24 of the positive tab is f1+g1，a1/2≤(f1+g1)≤a1The distance from the positive second groove wall 112 to the short side of the positive plate 1 adjacent to the positive second groove wall 112 is g1The distance between the positive electrode first groove wall 111 and the short side of the positive electrode plate 1 adjacent to the positive electrode first groove wall 111 is c1，g1≤c1。a1＝c1+g1+e1+f1+g1Let the height of the positive electrode coating region 22 be k1，k1＜b1Let the height of the positive electrode empty foil region 21 be h1，h1≤15mm。
Wherein d is1The range is 0mm-50mm, wherein d1 can be 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm or 50 mm. e.g. of the type1The value range is 0mm-100mm, wherein e1It may be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm or 100 mm.
Above-mentioned size relation can be convenient for anodal ear groove and anodal ear location, to the restriction of anodal piece 1 length and width in addition, can make this anodal piece 1 and the electric core adaptation of corresponding size.
Let f be the distance from the second side wall 44 of the negative tab 4 to the second groove wall 312 of the negative tab groove 312The width of the negative electrode tab 4 is e2Of negative electrode tab 4The distance from the first side wall 43 of the negative electrode tab to the first groove wall 311 of the negative electrode tab groove 31 is d2，(f2+e2)≤d2. Wherein the width of the negative electrode sheet 3 is b2，b2Less than 50mm, and the length of the negative plate 3 is a2，10≤a2/b2Is less than or equal to 100. Let the distance f from the second side wall 44 of the negative electrode tab to the short side of the negative electrode tab 3 adjacent to the second side wall 44 of the negative electrode tab2+g2，a2/2≤(f2+g2)≤a2Let the distance from the second slot wall 312 to the short side of the negative plate 3 adjacent to the second slot wall 312 be g2The distance between the first slot wall 311 of the negative electrode and the short side of the negative electrode plate 3 adjacent to the first slot wall 311 of the negative electrode is c2，g2≤c2。a2＝c2+g2+e2+f2+g2Let the height of the negative electrode coating region 42 be k2Height b of negative electrode sheet 32，k2＜b2The height of the negative electrode empty foil region 41 is h2，h2≤15mm。
The above size relationship can facilitate the positioning of the negative electrode tab slot and the negative electrode tab, and in addition, for the limitation of the length and the width of the negative electrode sheet 3, the negative electrode sheet 3 can be matched with the battery cell with the corresponding size.
The positive electrode sheet 1 and the negative electrode sheet 3 have a relationship wherein a1＜a2，b1＜b2，c1＜c2，g1＜ g2，(d2+e2+f2)＜(d1+e1+f1)，k1≤k2. So set up, can make anodal piece 1 and negative pole piece 3 can not contact in piling up positive tab 2 and negative pole ear 4, but the two interval sets up, avoids the short circuit.
In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will appreciate that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements and substitutions will now be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A battery cell comprising at least one core package, the core package comprising:
the positive plate (1) is provided with a positive lug groove (11) along the length direction, the positive lug groove (11) is provided with a positive lug (2), and the positive lug (2) protrudes out of the positive lug groove (11);
the negative plate (3) is provided with a negative lug groove (31) along the length direction, the negative lug groove (31) is provided with a negative lug (4), and the negative lug (4) protrudes out of the negative lug groove (31);
the diaphragm is arranged between the positive plate (1) and the negative plate (3).
2. The battery cell of claim 1, wherein the length of the positive ear groove (11) is greater than the length of the negative ear groove (31).
3. The battery cell of claim 1, wherein the positive tab (11) is disposed in the middle of the positive tab (1), and the negative tab (31) is disposed in the middle of the negative tab (3).
4. The battery cell of claim 2, wherein the separator has grooves corresponding to the negative electrode lug groove (31) and the positive electrode lug groove (11), and the groove bottom of the grooves is higher than the groove bottoms of the negative electrode lug groove (31) and the positive electrode lug groove (11).
5. The battery cell according to claim 3, characterized in that the positive tab (2) comprises a positive coating region (22) and a positive empty foil region (21), the positive coating region (22) being located below the positive empty foil region (21), and the positive coating region (22) being connected to the base of the positive tab groove (11).
6. The battery cell of claim 2, wherein the distance d from the positive tab first side wall (23) of the positive tab (2) to the positive first groove wall (111) of the positive tab groove (11) is defined as1The width of the positive lug (2) is e1The distance from the second side wall (24) of the positive lug (2) to the second groove wall (112) of the positive lug groove (11) is f1，f1＞(d1+e1)。
7. The battery cell of claim 1, wherein the negative tab (4) comprises a negative coating region (42) and a negative empty foil region (41), wherein the negative coating region (42) is located below the negative empty foil region (41), and wherein the negative coating region (42) is connected to a bottom of the negative tab slot (31).
8. The battery cell of claim 7, wherein a distance f is defined as a distance from the second negative tab sidewall (44) of the negative tab (4) to the second negative slot wall (312) of the negative tab slot (31)2The width of the negative electrode tab (4) is e2The distance from the first side wall (43) of the negative electrode tab (4) to the first groove wall (311) of the negative electrode tab groove (31) is d2，d2≥(f2+e2)。
9. The battery cell of any of claims 1 to 8, wherein the length of the positive plate (1) is given by a1The length of the negative plate (3) is a2The width of the positive plate (1) is b1The width of the negative plate (3) is b2，a1＜a2，b1＜b2。
10. A battery module comprising the battery cell of any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220291834.2U CN216958434U (en) | 2022-02-10 | 2022-02-10 | Battery cell and battery module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220291834.2U CN216958434U (en) | 2022-02-10 | 2022-02-10 | Battery cell and battery module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216958434U true CN216958434U (en) | 2022-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220291834.2U Active CN216958434U (en) | 2022-02-10 | 2022-02-10 | Battery cell and battery module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216958434U (en) |
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- 2022-02-10 CN CN202220291834.2U patent/CN216958434U/en active Active
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