CN112838331A - Battery, battery module, battery pack and electric vehicle - Google Patents
Battery, battery module, battery pack and electric vehicle Download PDFInfo
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- CN112838331A CN112838331A CN201911159766.3A CN201911159766A CN112838331A CN 112838331 A CN112838331 A CN 112838331A CN 201911159766 A CN201911159766 A CN 201911159766A CN 112838331 A CN112838331 A CN 112838331A
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- cover plate
- battery
- insulator
- separator
- tab
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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
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- Battery Mounting, Suspending (AREA)
Abstract
The invention provides a battery, which comprises a shell and a partition board positioned in the shell, wherein the shell is opened towards one side, and the partition board divides the interior of the shell into a plurality of accommodating cavities; the accommodating cavity is internally provided with a pole core group, and the pole core group comprises at least one pole core; a cover plate closing the opening of the housing; the inner side of the cover plate is fixed with a connecting sheet which is connected with the pole core groups in the two adjacent containing cavities so as to connect the pole core groups in series. The connecting sheet is fixedly arranged on the inner side of the cover plate, namely above the accommodating cavity, so that the sealing property of the accommodating cavity can be improved; and after the connecting sheet is fixedly arranged on the inner side of the cover plate, the whole cover plate is covered on the shell to seal the accommodating cavity, so that the process can be saved. Meanwhile, the invention also provides a battery module, a battery pack and an electric vehicle based on the battery provided by the invention.
Description
Technical Field
The invention relates to the field of batteries, in particular to a battery, a battery module, a battery pack and an electric vehicle.
Background
With the continuous popularization of new energy vehicles, the use requirements of power batteries in the new energy vehicles become higher and higher. Particularly, the mileage requirement of a user on the new energy vehicle during the continuous process is continuously improved, and the total capacity of a battery pack used by the new energy vehicle is continuously improved; meanwhile, when the power battery pack is used, internal consumption and heat generation caused by internal resistance are required to be reduced as much as possible.
Generally, only one bare cell or a plurality of cells in parallel state are arranged in the outer shell of the battery, and the voltage of the whole battery cannot be increased by containing a single bare cell or a plurality of cells in parallel, for example, the voltage of a lithium titanate battery is 2.4 v; the voltage of the lithium iron phosphate battery is 3.2 volts; the voltage of the ternary battery is 3.7 volts; the voltage of the multipolymer battery was 4.3 volts. Therefore, when high voltage (high capacity) is needed, a large number of batteries are connected in series to form a battery pack, and then the battery pack is assembled into a power battery pack; and two adjacent batteries need to be in power connection through an external power connecting piece. The installation structure of the battery is more, the cost is increased, and the whole weight is increased; meanwhile, the installation structure occupies more inner space of the bag body, the overall capacity of the power battery bag is reduced, the more batteries are arranged side by side, and the more space is wasted. In addition, because of need set up a plurality of external power connecting pieces and carry out the power connection, lead to the internal resistance to increase, improved the internal consumption and the generate heat of power battery package in use.
Adopt the baffle to hold the chamber with two adjacent naked electric cores and separate in patent 201644477.X, though practiced thrift the inner space, the serial connection mode between two naked electric cores runs through the connecting piece at two adjacent baffles that hold between the chamber, and the baffle that runs through two adjacent chambers can influence two leakproofness that hold between the chamber for electrolyte flows through in two hold chambers, has the risk of short circuit.
Disclosure of Invention
The present disclosure is directed to solving at least one of the problems in the prior art. To this end, in a first aspect of the present application, there is provided a battery comprising:
the shell is provided with an opening towards one side, and the partition plates divide the interior of the shell into a plurality of accommodating cavities;
the accommodating cavity is internally provided with a pole core group, and the pole core group comprises at least one pole core;
a cover plate closing the opening of the housing;
the inner side of the cover plate is fixed with a connecting sheet which is connected with the pole core groups in the two adjacent containing cavities so as to connect the pole core groups in series.
In one embodiment of the present application, the connecting piece is of a unitary structure with the cover plate.
In one embodiment of the present application, an end of the separator plate near the cover plate abuts the connecting piece.
In one embodiment of the present application, a pressing block is disposed inside the cover plate, the pressing block is fixedly connected with the cover plate, and the pressing block fixes the connecting piece inside the cover plate.
In one embodiment of the present application, the pressing block is located between the partition plate and the cover plate, and a side of the pressing block facing the partition plate abuts against the partition plate.
In an embodiment of the present application, the pressing block is located between the partition plate and the cover plate, a first groove is opened on one side of the pressing block facing the partition plate, and one end of the partition plate facing the cover plate is at least partially inserted into the first groove.
In an embodiment of the present application, the cover plate further includes a connecting plate insulator on the inner side, the connecting plate insulator is disposed between the connecting plate and the cover plate, the connecting plate insulator is fixed to the pressing block in a matching manner, and the connecting plate insulator at least covers the whole connecting plate.
In one embodiment of the present application, a cover plate insulating member is fixed on the inner side of the cover plate, the connecting piece is fixedly arranged on the inner side of the cover plate insulating member, and the cover plate insulating member insulates and isolates the cover plate from the connecting piece.
In one embodiment of the present application, the connecting piece is of unitary construction with the cover plate insulator.
In one embodiment of the present application, an end of the separator plate near the cover plate abuts the connecting piece.
In an embodiment of the present application, a pressing block is disposed inside the cover plate insulating member, the pressing block is fixedly connected to the cover plate insulating member, and the pressing block fixes the connecting sheet inside the cover plate insulating member.
In one embodiment of the present application, the pressing block is located between the partition plate and the cover plate insulating member, and a side of the pressing block facing the partition plate abuts against the partition plate.
In an embodiment of the present application, the pressing block is located between the partition plate and the cover plate insulating member, a first groove is opened on one side of the pressing block facing the partition plate, and one end of the partition plate facing the cover plate insulating member is at least partially inserted into the first groove.
In an embodiment of the application, a connecting sheet insulator is further arranged on the inner side of the cover plate insulator, the connecting sheet insulator is arranged between the connecting sheet and the cover plate insulator, the connecting sheet insulator and the pressing block are matched to fix the connecting sheet, and the connecting sheet insulator at least covers the whole connecting sheet.
In one embodiment of the application, a liquid injection hole and/or an explosion-proof valve is/are arranged on the cover plate corresponding to each accommodating cavity.
In one embodiment of the present application, the tab is a copper aluminum tab.
In one embodiment of the present application, a first electrode drawing part and a second electrode drawing part are provided in each of the pole core groups, and the connecting sheet connects the first electrode drawing part in one pole core group and the second electrode drawing part in another pole core group adjacent thereto.
In an embodiment of this application, still be equipped with first leading-out terminal and second leading-out terminal on the apron, it is a plurality of utmost point core group is series connection in proper order, first leading-out terminal is connected with the first electrode extraction part of first utmost point core group, the second leading-out terminal is connected with the second electrode extraction part of the last utmost point core group of establishing ties.
In one embodiment of the present application, the housing and the partition are of an integrally formed structure.
In one embodiment of the present application, the housing includes an end wall at an end and a bottom wall connected to the end wall, the height of the end wall relative to the bottom wall being greater than the height of the partition relative to the bottom wall; and the difference between the height of the end wall relative to the bottom wall and the height of the partition plate relative to the bottom wall is larger than the thickness of the connecting piece.
In a second aspect of the present application, there is provided a battery module including the battery according to any one of the above embodiments.
In a third aspect of the present application, a battery pack is provided that includes the battery or the battery module of any one of the above embodiments.
In a fourth aspect of the present application, there is provided an electric vehicle including the above battery pack.
Compared with the prior art, the beneficial effects of the application are that: the connecting sheet is fixedly arranged on the inner side of the cover plate, namely above the accommodating cavity, so that the sealing property of the accommodating cavity can be improved; and after the connecting sheet is fixedly arranged on the inner side of the cover plate, the whole cover plate is covered on the shell to seal the accommodating cavity, so that the process can be saved.
Drawings
Fig. 1 is a schematic structural diagram of a battery according to a first embodiment of the present application.
Fig. 2 is a partially enlarged view of a portion L in fig. 1.
Fig. 3 is a schematic structural diagram of the pole core assembly of the present application.
Fig. 4 is a schematic structural diagram of a battery according to a second embodiment of the present application.
Fig. 5 is a partially enlarged view of a portion M in fig. 4.
Fig. 6 is a partial structural schematic view of another battery according to a second embodiment of the present application.
Fig. 7 is a schematic structural diagram of a battery according to a third embodiment of the present application.
Fig. 8 is a partially enlarged view of a portion N in fig. 7.
Fig. 9 is a schematic structural diagram of a battery pack provided in the present application.
Detailed Description
While the following is a description of the preferred embodiments of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; 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 by those skilled in the art according to specific situations.
Referring to fig. 1 to 3, a battery 10 according to a first embodiment of the present invention includes a housing 100 and a partition 300 disposed in the housing 100, wherein the housing 100 is open to one side, and the partition 300 divides the interior of the housing 100 into a plurality of accommodating cavities 400; the accommodating cavity 400 is provided with a pole core set 200, and the pole core set 200 contains at least one pole core 210 (shown in fig. 3).
As shown in fig. 1, the case 100 of the battery 10 accommodates 4 electrode core groups 200 therein, and the 4 electrode core groups 200 are arranged in the length direction of the battery 10 and connected in series. The left-right direction in fig. 1 is a first direction a, that is, the length direction of the cell 10, and the electrode core groups 200 are arranged in the first direction a of the cell 10. Of course, in other embodiments, the number of pole core sets 200 may be 3, 5, or more.
In one embodiment of the present invention, as shown in fig. 1, 3 partition plates 300 are disposed in the casing 100, the 3 partition plates 300 partition the inside of the casing 100 into 4 accommodating cavities 400, and meanwhile, one pole core group 200 is disposed in each accommodating cavity 400, and the pole core groups 200 are connected in series in sequence; in other embodiments of the present invention, the number of the separators 300 may be 1 or more than 2, and each accommodation chamber 400 may accommodate only one pole-core group 200 as shown in fig. 1, or may accommodate a plurality of pole-core groups 200, such as 2 or 3, side by side in one accommodation chamber 400. In the present invention, it is desirable that one core assembly 200 is accommodated in one accommodation chamber 400, so that the best isolation effect can be achieved.
The battery 10 further includes a cap plate 500, and the cap plate 500 closes the opening of the case 100. The connecting piece 600 is fixed on the inner side of the cover plate 500, and the connecting piece 600 connects the pole core groups 200 in the two adjacent accommodating cavities 400, so that the pole core groups 200 are connected in series.
The inner side of the cover plate 500 refers to a side of the cover plate 500 facing a second direction B, the second direction B refers to a direction facing the ground when the battery is in normal use and also a direction downward along the width of the battery 10, the second direction B is perpendicular to the first direction a, and the inner side of the cover plate 500 also refers to a lower surface of the cover plate 500 when the battery is in normal use. The connecting piece 600 is fixed on the inner side of the cover plate 500, the connecting piece 600 can be pressed on the lower surface of the cover plate 500 through other structures, or the connecting piece 600 can be fixed on a pressing block, and then the pressing block is fixed on the lower side of the cover plate 500. Of course, the connection piece 600 may be integrally molded in the cover plate 500, and in this case, the inner side does not mean that the connection piece 600 is completely located at the inner side (or below) of the cover plate 500, but means that the connection piece 600 is located at an inner side of the cover plate 500 as a whole, and more specifically, at least a portion of the connection piece 600 connected to the pole core groups 200 in two adjacent receiving cavities 400 is located below the cover plate 500.
In patent 201621444477.X, a connecting piece is penetrated through a partition plate between two adjacent accommodating cavities to connect two adjacent bare cells in series, and the partition plate penetrating through the two adjacent accommodating cavities affects the tightness between the two accommodating cavities, so that the electrolyte flows through the two accommodating cavities with the risk of short circuit. In this application, with the fixed setting of connection piece 600 inboard at apron 500, that is to say the setting is in the top that holds the chamber, can improve the leakproofness that holds the chamber. And after the connecting piece 600 is fixedly arranged at the inner side of the cover plate 500, the whole cover plate 500 is covered on the shell 100 to seal the accommodating cavity 400, so that the process can be saved. Furthermore, in the case of 201621444477.X, it is necessary to simultaneously injection-mold a through hole for the connection piece to pass through on the partition plate when the housing is injection-molded; simultaneously, after the connection piece wears to establish in the through-hole, still need seal the through-hole. In the application, the connecting piece 600 is arranged on the inner side of the cover plate 500, and the partition plate 300 does not need to be processed in the shell forming process, so that the process difficulty is reduced; meanwhile, the partition plate 300 does not need to be sealed for the second time, and the sealing reliability is improved.
In the present application, the pole core 210 is a pole core commonly used in the field of power batteries, and the pole core 210 and the pole core group 200 are components inside the outer shell of the battery 10 and cannot be understood as the battery 10 itself; the pole core 210 can be formed by winding, or the pole core 210 can be made in a lamination mode; generally, the core 210 includes at least a positive electrode sheet, a separator, and a negative electrode sheet, and an electrolyte, and the core 210 generally refers to an assembly that is not completely sealed. Thus, the battery 10 referred to in the present application cannot be simply understood as a battery module or a battery pack because it includes a plurality of pole pieces 210. In the present application, the pole core set 200 may be composed of a single pole core 210; at least two pole cores 210 can also be included, and the at least two pole cores 210 are connected in parallel to form the pole core group 200. For example, after two pole cores 210 are connected in parallel, a pole core group 200 is formed; or four pole cores 210 are connected in parallel to form the pole core group 200.
In a further embodiment, the connecting piece 600 is a unitary structure with the cover plate 500. The connecting sheet 600 can be integrally injection-molded on the inner side of the cover plate 500 to form an integral structure, so that the battery installation process is further saved.
In a further embodiment, an end of the separator 300 near the cover plate 500 abuts the attachment tab 600. The end of the separator 300 close to the cover plate 500 means that when the battery is in normal use, the upper end of the separator 300 is abutted to the connecting sheet 600, so that the accommodating chambers 400 at two sides of the separator 300 can be isolated and sealed, and the electrolytes in the two accommodating chambers 400 are prevented from mutually circulating; on the other hand, the upper end of the separator 300 is abutted to the connecting sheet 600 to fix the connecting sheet 600 on the inner side of the cover plate 500, so that the battery is prevented from loosening the connecting sheet 600 due to shaking when in use, and the electric connection of the connecting sheet 600 to the two adjacent pole core groups 200 is further influenced.
In a further embodiment, a liquid injection hole 510 and/or an explosion-proof valve 520 are provided on the cover plate 500 corresponding to each receiving chamber 400. Electrolyte is injected into the accommodating chamber 400 through the injection hole 510. The explosion-proof valve 520 is used to open when the air pressure in the accommodating chamber 400 rises, and release the air pressure in the accommodating chamber 400 to prevent explosion. In this embodiment, the cover plate 500 corresponding to each accommodating chamber 400 is provided with a liquid injection hole 510 for facilitating liquid injection; the explosion-proof valve 520 is arranged on the cover plate 500 corresponding to each accommodating cavity 400, so that the internal pressure of each accommodating cavity 400 can be adjusted, the explosion risk is reduced, and the design of the cover plate is optimized overall.
In a further embodiment, the tab 600 is a copper aluminum tab.
In a further embodiment, a first electrode drawing part 220 and a second electrode drawing part 230 are provided in each of the pole core groups 200, and a connecting sheet 600 connects the first electrode drawing part 220 of one pole core group 200 with the second electrode drawing part 230 of another pole core group 200 adjacent thereto (as shown in fig. 1). In the present embodiment, the first electrode drawing member 220 is a positive electrode, and the second electrode drawing member 230 is a negative electrode. In a further embodiment, the first electrode lead-out member 220 is composed of a positive electrode tab, and the second electrode lead-out member 230 is composed of a negative electrode tab. Alternatively, the first electrode lead-out member 220 and the second electrode lead-out member 230 are adapters for connecting the positive and negative electrode tabs and the connecting sheet.
In a further embodiment, a first lead-out terminal 530 and a second lead-out terminal 540 (as shown in fig. 1) are further provided on the cover plate 500, the plurality of pole-core groups 200 are sequentially connected in series, the first lead-out terminal 530 is connected to the first electrode lead-out part 220 of the first pole-core group 200, and the second lead-out terminal 540 is connected to the second electrode lead-out part 230 of the last pole-core group 200 connected in series. As shown in fig. 1, there are 4 electrode-core groups 200 connected in series in fig. 1, when the battery is in normal use, the first direction a is a length square of the battery, which is also a left-right direction in fig. 1, the leftmost electrode-core group 200 in fig. 1 is the first electrode-core group 200, the rightmost electrode-core group 200 in fig. 1 is the last electrode-core group 200a connected in series, the first lead-out terminal 530 is connected to the first electrode lead-out member 220 of the first electrode-core group 200, and the second lead-out terminal 540 is connected to the second electrode lead-out member 230 of the last electrode-core group 200 a.
In other embodiments, the first lead-out terminal 530 in the battery 10 may be connected to the second lead-out terminal 540 in another battery in series to form a battery pack. The first outgoing terminal 530 and the second outgoing terminal 540 in the battery 10 can also be connected with an external electronic device, and are used for supplying power to the external electronic device to realize the electrical output of the battery.
In a further embodiment, the housing 100 is a unitary structure with the baffle 300. As shown in fig. 1 and 2, the housing 100 is integrally formed with the partition 300 to form a plurality of receiving chambers 400. The battery case 100 and the separator 300 are preferably made of insulating plastic, so that the electrolyte inside the adjacent accommodating cavity 400 is effectively blocked from being conducted without designing an additional insulating member or an inner film, and the risk of internal short circuit and the risk of electrolyte decomposition caused by electrolyte conduction are avoided. The lithium embedding reaction of the metal shell does not exist in the plastic shell, and the safety is high.
In a further embodiment, the housing 100 includes an end wall 110 at an end and a bottom wall 120 connected to the end wall 110, a height of the end wall 110 relative to the bottom wall 120 is greater than a height of the partition 300 relative to the bottom wall 120, and a difference between the height of the end wall 110 relative to the bottom wall 120 and the height of the partition 300 relative to the bottom wall 120 is greater than a thickness of the attachment tabs 600. As shown in fig. 1 and 2, the end arm 110 is disposed parallel to the partition 300. By adopting the parameter setting, the connecting sheet 600 can be better embedded between the cover plate 500 and the partition plate 300, so that the cover plate 500 can be properly covered on the shell 100, the gap is reduced, and the cover is more tightly covered. Further, the cover plate 500 is connected to the housing 100 in a sealing manner, and a sealing ring 550 may be disposed at the sealing position between the cover plate 500 and the housing 100 to further improve the sealing effect at the sealing position.
Referring to fig. 4 and 5, a battery 10a according to a second embodiment of the present invention includes a pressing block 700 disposed inside a cover plate 500, the pressing block 700 is fixedly connected to the cover plate 500, and the pressing block 700 fixes a connecting piece 600 inside the cover plate 500. The connection piece 600 may be disposed between the pressing block 700 and the cover plate 500, and after the pressing block 700 is fixedly connected to the cover plate 500, the pressing force toward the cover plate 500 is applied to the connection piece 600, so that the connection piece 600 is fixed to the inner side of the cover plate 500. The connecting piece 600 can be inserted and fixed in the pressing block 700, for example, a through hole is formed in the pressing block 700, the connecting piece 600 is inserted and fixed in the through hole of the pressing block 700, and the pressing block 700 is fixedly connected with the cover plate 500, so that the connecting piece 600 is fixed on the inner side of the cover plate 500, and the firmness of the connecting piece 600 fixed on the cover plate 500 is further improved. In some embodiments, the cover plate 500, the pressing block 700 and the connecting piece 600 are integrally formed, so that the connection stability between the cover plate 500, the pressing block 700 and the connecting piece 600 is further improved, and the connecting piece 600 is prevented from shaking during the use of the battery.
In a further embodiment, the press block 700 is located between the spacer plate 300 and the cover plate 500, and a side of the press block 700 facing the spacer plate 300 abuts the spacer plate 300. That is to say, the briquetting 700 directly butts the upper end of baffle 300, can further completely cut off the chamber 400 that holds of baffle 300 both sides sealed, avoids two electrolyte that hold in the chamber 400 to circulate each other. In addition, since the lower side of the pressing block 700 is abutted by the upper end of the partition 300, when the pressing block 700 is pressed on the upper end of the partition 300, the upper end of the partition 300 has a reaction force against the pressing block 700, and the reaction force can further firmly fix the connecting piece 500 on the cover plate 500.
Referring to fig. 6, in a further embodiment, the pressing block 700 is located between the partition 300 and the cover plate 500, a first groove 710 is formed on a side of the pressing block 700 facing the partition 300, and an end of the partition 300 facing the cover plate 500 is at least partially inserted into the first groove 710. In the first recess 710 of the one end at least part of baffle 300 orientation apron 500, make baffle 300 fix briquetting 700, avoid rocking of battery first recess 710 in the use, and then can avoid rocking of the apron 500 of being connected with briquetting 700, improve the holistic reliability of battery connection.
Referring again to fig. 5, in a further embodiment, the cover plate 500 further includes a connecting plate insulator 800 on the inner side, the connecting plate insulator 800 is disposed between the connecting plate 600 and the cover plate 500, the connecting plate insulator 800 and the press block 700 cooperate to fix the connecting plate 600, and the connecting plate insulator 800 at least covers the entire connecting plate 600. When the cover plate 500 is a metal cover plate, the connecting plate insulator 800 can electrically insulate the cover plate 500 from the connecting plate 600, thereby preventing a short circuit between the connecting plate 600 and the cover plate 500 and improving the safety and stability of the battery. The connecting piece insulator 800 and the pressing block 700 can be integrally injection molded, and the connecting piece 600 is stably fixed between the connecting piece insulator 800 and the pressing block 700.
Referring to fig. 7 and 8, a battery 10b according to a third embodiment of the present invention includes a cover plate insulating member 900 fixed to an inner side of a cover plate 500, a connecting plate 600 fixed to an inner side of the cover plate insulating member 900, and the cover plate insulating member 900 electrically isolating the cover plate 500 from the connecting plate 600. When the cover plate 500 is a metal cover plate, the cover plate insulating member 900 isolates the electrical connection between the cover plate 500 and the connecting sheet 600 inside the cover plate 500, thereby avoiding the conductive short circuit between the connecting sheet 600 and the cover plate 500 and improving the safety and stability of the battery.
In a further embodiment, the tab 600 is a unitary structure with the cover plate insulator 900. The connecting piece 600 and the cover plate insulating piece 900 can be integrally formed in an injection molding mode, and the firmness of the connection of the connecting piece 600 on the cover plate 500 is improved.
In a further embodiment, an end of the separator 300 near the cover plate 500 abuts the attachment tab 600. In this embodiment, the end of the separator 300 close to the cover plate 500 refers to the upper end of the separator 300, and the upper end of the separator 300 is abutted to the connecting sheet 600 when the battery is in normal use, so that the accommodating cavities 400 on both sides of the separator 300 can be sealed in an isolated manner, and the electrolytes in the two accommodating cavities 400 are prevented from flowing through each other; on the other hand, the upper end of the separator 300 is abutted to the connecting sheet 600 to fix the connecting sheet 600 on the inner side of the cover plate 500, so that the battery is prevented from loosening the connecting sheet 600 due to shaking when in use, and the electric connection of the connecting sheet 600 to the two adjacent pole core groups 200 is further influenced.
In a further embodiment, a press block 700 is disposed inside the cover plate insulator 900, the press block 700 is fixedly connected to the cover plate insulator 900, and the press block 700 fixes the connection piece 600 inside the cover plate insulator 900. The connecting piece 600 can be located between the pressing block 700 and the cover plate insulating piece 900, after the pressing block 700 is fixedly connected with the cover plate insulating piece 900, pressure towards the cover plate insulating piece 900 is applied to the connecting piece 600, the connecting piece 600 is fixed on the inner side of the cover plate insulating piece 900, and then the connecting piece 600 is fixed on the inner side of the cover plate 100. The connecting sheet 600 can be inserted and fixed in the pressing block 700, for example, a through hole is formed in the pressing block 700, the connecting sheet 600 is inserted and fixed in the through hole of the pressing block 700, the pressing block 700 is fixedly connected with the cover plate insulating piece 900, the connecting sheet 600 is fixed on the inner side of the cover plate insulating piece 900, and firmness of the connecting sheet 600 fixed on the cover plate insulating piece 900 is further improved.
In a further embodiment, the press block 700 is located between the spacer 300 and the cover plate insulator 900, and a side of the press block 700 facing the spacer 300 abuts the spacer 300. That is to say, the briquetting 700 directly butts the upper end of baffle 300, can further completely cut off the chamber 400 that holds of baffle 300 both sides sealed, avoids two electrolyte that hold in the chamber 400 to circulate each other. In addition, since the lower side of the pressing block 700 is abutted by the upper end of the spacer 300, when the pressing block 700 is pressed against the upper end of the spacer 300, the upper end of the spacer 300 has a reaction force against the pressing block 700, and the reaction force can further firmly fix the connecting piece 500 to the cover plate insulating member 900.
In a further embodiment, the pressing block 700 is located between the spacer 300 and the cover plate insulator 900, a first groove 710 is opened on a side of the pressing block 700 facing the spacer 300, and an end of the spacer 300 facing the cover plate insulator 900 is at least partially inserted into the first groove 710. The one end of baffle 300 towards apron insulator 900 is at least partially inserted in first recess 710, makes baffle 300 fixed briquetting 700, avoids rocking of first recess 710 in the use of battery, and then can avoid rocking of the apron insulator 900 of being connected with briquetting 700, improves the holistic reliability of battery connection.
In a further embodiment, a connecting piece insulator 800 is further disposed inside the cover plate insulator 900, the connecting piece insulator 800 is disposed between the connecting piece 600 and the cover plate insulator 900, the connecting piece insulator 800 and the press block 700 cooperate to fix the connecting piece 600, and the connecting piece insulator 800 at least covers the whole connecting piece 600. The tab insulator 800 may further insulate the electrical connection between the tab 600 and the cover plate 500.
In another aspect of the present application, there is provided a battery module including the battery 10 of any of the above embodiments. Adopt the battery module that this application provided, assembly process is few, and the cost of battery is lower.
As shown in fig. 9, the present application provides a battery pack 20 including the battery 10 of any one of the above embodiments or the above provided battery module. By adopting the battery pack 20 provided by the application, the assembly process is less, the cost of the battery is lower, and the energy density of the battery pack 20 is higher.
The invention also provides an electric vehicle which comprises the battery pack 20. The electric vehicle provided by the application has the advantages of high cruising ability and low cost.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (23)
1. A battery, comprising:
the shell is provided with an opening towards one side, and the partition plates divide the interior of the shell into a plurality of accommodating cavities;
the accommodating cavity is internally provided with a pole core group, and the pole core group comprises at least one pole core;
a cover plate closing the opening of the housing;
the inner side of the cover plate is fixed with a connecting sheet which is connected with the pole core groups in the two adjacent containing cavities so as to connect the pole core groups in series.
2. The battery of claim 1, wherein the tab is of unitary construction with the cover plate.
3. The battery of claim 1, wherein an end of the separator near the cover plate abuts the tab.
4. The battery as claimed in claim 1, wherein a pressing block is disposed inside the cover plate, the pressing block is fixedly connected with the cover plate, and the pressing block fixes the connecting piece inside the cover plate.
5. The battery of claim 4, wherein the compact is positioned between the separator and the cover plate, and a side of the compact facing the separator abuts the separator.
6. The battery of claim 4, wherein the pressing block is located between the separator and the cover plate, a first groove is formed on one side of the pressing block facing the separator, and one end of the separator facing the cover plate is at least partially inserted into the first groove.
7. The battery of claim 4, wherein the cover plate further includes a tab insulator on an inner side thereof, the tab insulator being disposed between the tab and the cover plate, the tab insulator and the press block cooperating to secure the tab, the tab insulator covering at least the entire tab.
8. The battery of claim 1, wherein a cover plate insulator is fixed to the inner side of the cover plate, and the connecting piece is fixedly arranged on the inner side of the cover plate insulator, and the cover plate insulator insulates and isolates the cover plate from the connecting piece.
9. The battery of claim 8, wherein the tab is of unitary construction with the lid insulator.
10. The battery of claim 8, wherein an end of the separator near the cover plate abuts the tab.
11. The battery of claim 8, wherein a press block is disposed inside the lid insulator, the press block being fixedly connected to the lid insulator, the press block securing the connecting tab inside the lid insulator.
12. The battery of claim 11, wherein the ballast is located between the separator and the lid insulator, and a side of the ballast facing the separator abuts the separator.
13. The battery of claim 11, wherein the compression block is located between the separator and the lid insulator, wherein a side of the compression block facing the separator defines a first groove, and wherein an end of the separator facing the lid insulator is at least partially inserted into the first groove.
14. The battery of claim 8, wherein a connecting piece insulator is further arranged on the inner side of the cover plate insulator, the connecting piece insulator is arranged between the connecting piece and the cover plate insulator, the connecting piece insulator and the pressing block are matched to fix the connecting piece, and the connecting piece insulator at least covers the whole connecting piece.
15. The battery of claim 1, wherein a liquid injection hole and/or an explosion-proof valve is arranged on the cover plate corresponding to each accommodating cavity.
16. The battery of claim 1, wherein the tab is a copper aluminum tab.
17. The battery according to claim 1, wherein a first electrode lead-out member and a second electrode lead-out member are provided in each of the electrode core groups, and the connecting tabs connect the first electrode lead-out member of one electrode core group with the second electrode lead-out member of another electrode core group adjacent thereto.
18. The battery according to claim 17, wherein the cap plate is further provided with a first lead-out terminal and a second lead-out terminal, the plurality of the pole core groups are sequentially connected in series, the first lead-out terminal is connected with the first electrode lead-out member of the first pole core group, and the second lead-out terminal is connected with the second electrode lead-out member of the last pole core group connected in series.
19. The battery of claim 1, wherein the housing and the separator are of unitary construction.
20. The cell defined in claim 1, wherein the housing includes end walls at the ends and a bottom wall connected to the end walls, the height of the end walls relative to the bottom wall being greater than the height of the separator relative to the bottom wall; and the difference between the height of the end wall relative to the bottom wall and the height of the partition plate relative to the bottom wall is larger than the thickness of the connecting piece.
21. A battery module comprising a plurality of the batteries according to any one of claims 1 to 20.
22. A battery pack comprising a plurality of batteries according to any one of claims 1 to 20 or a plurality of battery modules according to claim 21.
23. An electric vehicle comprising the battery module according to claim 21 or the battery pack according to claim 22.
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| CN201911159766.3A CN112838331B (en) | 2019-11-22 | 2019-11-22 | Battery, battery module, battery pack and electric vehicle |
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| CN201911159766.3A CN112838331B (en) | 2019-11-22 | 2019-11-22 | Battery, battery module, battery pack and electric vehicle |
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| CN112838331B CN112838331B (en) | 2022-01-07 |
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| CN112838331B (en) | 2022-01-07 |
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