CN219371286U - Battery cell - Google Patents

Battery cell Download PDF

Info

Publication number
CN219371286U
CN219371286U CN202320579568.8U CN202320579568U CN219371286U CN 219371286 U CN219371286 U CN 219371286U CN 202320579568 U CN202320579568 U CN 202320579568U CN 219371286 U CN219371286 U CN 219371286U
Authority
CN
China
Prior art keywords
cover plate
tab
battery
lug
assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202320579568.8U
Other languages
Chinese (zh)
Inventor
周勇
李奎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Innovation Aviation Technology Group Co ltd
Original Assignee
China Innovation Aviation Technology Group Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Innovation Aviation Technology Group Co ltd filed Critical China Innovation Aviation Technology Group Co ltd
Priority to CN202320579568.8U priority Critical patent/CN219371286U/en
Priority to DE202023102991.4U priority patent/DE202023102991U1/en
Application granted granted Critical
Publication of CN219371286U publication Critical patent/CN219371286U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H01M50/557—Plate-shaped terminals
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The utility model relates to the technical field of batteries, and provides a battery. The battery includes: the battery pack comprises a shell, a first cover plate assembly, a second cover plate assembly and a battery cell; the housing includes opposed first and second ends; the first cover plate component is arranged at the first end of the shell; the first cover plate assembly comprises a first cover plate and a first electrode assembly arranged on the first cover plate; the second cover plate component is arranged at the second end of the shell; the second cover plate assembly comprises a second cover plate and a second electrode assembly arranged on the second cover plate; the battery cell is arranged in the shell, the battery cell comprises a battery cell main body, a first electrode lug and a second electrode lug, the first electrode lug and the second electrode lug with opposite polarities extend out from the opposite ends of the battery cell main body, the first electrode lug is directly connected to the first electrode assembly, and the second electrode lug is directly connected to the second electrode assembly. The battery provided by the application improves the multiplying power performance of the battery and reduces the production cost.

Description

Battery cell
Technical Field
The utility model relates to the technical field of batteries, in particular to a battery.
Background
In the related art, the tab of the battery cell is connected with the switching piece, and then the switching piece is connected with the cover plate component, so that the ohmic internal resistance of the battery is increased due to the existence of the switching piece, the multiplying power performance of the battery is reduced, the quick charge performance of the battery is influenced, and the heat generation of the tab is increased due to the increase of the contact internal resistance of the tab, so that the safety of the battery is influenced.
Disclosure of Invention
The utility model provides a battery, which is used for improving the safety and the quick charge performance of the battery.
The present utility model provides a battery comprising:
a housing including opposed first and second ends;
the first cover plate component is arranged at the first end of the shell; the first cover plate assembly comprises a first cover plate and a first electrode assembly arranged on the first cover plate;
the second cover plate assembly is arranged at the second end of the shell; the second cover plate assembly comprises a second cover plate and a second electrode assembly arranged on the second cover plate;
the battery cell, the battery cell set up in the casing, the battery cell includes electric core main part, first utmost point ear and second utmost point ear, the polarity is opposite first utmost point ear with the second utmost point ear is by the opposite both ends extension of electric core main part goes out, first utmost point ear lug direct connection in on the first electrode subassembly, the second utmost point ear direct connection in on the second electrode subassembly.
The battery provided by the application, the first cover plate component comprises the first cover plate and the first electrode component arranged on the first cover plate, and the first electrode lug is directly connected to the first electrode component, namely, the first electrode lug is directly connected with the first electrode component, so that the adoption of the switching piece to be electrically connected with the first electrode component is avoided; meanwhile, the second cover plate assembly comprises a second cover plate and a second electrode assembly arranged on the second cover plate, and the second lug is directly connected to the second electrode assembly, namely, the second lug is directly connected with the second electrode assembly, so that the adoption of the switching piece to be electrically connected with the second electrode assembly is avoided. By directly connecting the first tab with the first electrode assembly and the second tab with the second electrode assembly, in terms of the battery manufacturing process: the welding process of welding the lug and the switching piece and welding the switching piece and the pole is reduced, and one welding process is reduced, so that the welding tool is reduced, the production efficiency is improved, and the product yield is improved; in terms of battery performance: after the battery cell lugs are directly connected with the electrode posts, the internal resistance of the connection pieces is reduced, the ohmic internal resistance of the battery is reduced, the multiplying power performance is improved, meanwhile, the contact internal resistance of the electrode posts is reduced, the heat generation of the electrode posts is reduced, and the safety of the battery is improved.
Drawings
For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views.
Wherein:
fig. 1 is a schematic view showing a structure of a battery according to an exemplary embodiment;
fig. 2 is a schematic view showing a structure of a battery according to an exemplary embodiment;
fig. 3 is a partial structure exploded view of a battery according to an exemplary embodiment;
fig. 4 is a partial structure exploded view of a battery according to an exemplary embodiment;
FIG. 5 is a schematic structural view of a housing according to an exemplary embodiment;
fig. 6 is a schematic diagram of a cell structure according to an exemplary embodiment;
FIG. 7 is a schematic diagram of a front structure of a first cover plate assembly according to an exemplary embodiment;
FIG. 8 is a schematic diagram of a reverse construction of a first cover plate assembly according to an exemplary embodiment;
FIG. 9 is a schematic diagram of a front structure of a second cover plate assembly according to an exemplary embodiment;
FIG. 10 is a schematic view of the reverse side of a second cover plate assembly according to an exemplary embodiment;
FIG. 11 is a schematic view of a first tab and first cover plate assembly connection according to an exemplary embodiment;
fig. 12 is a schematic view illustrating a structure in which a first tab is connected to a first tab connection part according to an exemplary embodiment.
The reference numerals are explained as follows:
10. a housing; 110. a first end; 120. a second end; 130. explosion-proof holes; 140. a first surface; 150. a second surface;
20. a first cover plate assembly; 210. a first cover plate; 2110. a first cover plate body; 2120. a first insulating member; 220. a first electrode assembly; 2210. a first pole; 2220. a first tab connection portion; 230. a liquid injection hole;
30. a second cover plate assembly; 310. a second cover plate; 3110. a second cover plate body; 3120. a second insulating member; 320. a second electrode assembly; 3210. a second post; 3220. a second lug connection;
40. a battery cell; 410. a cell body; 420. a first tab; 430. a second lug; 440. a bending part;
50. and protecting the patch.
Detailed Description
The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is therefore to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.
In the description of the present disclosure, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.
Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.
Further, in the description of the present disclosure, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, as described in the example embodiments of the present disclosure, are described with the angles shown in the drawings, and should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.
Embodiments of the present disclosure provide a battery, as shown in fig. 1 to 12, including: the battery pack comprises a housing 10, a first cover plate assembly 20, a second cover plate assembly 30 and a battery cell 40. The housing 10 includes opposed first and second ends 110, 120; the first cover assembly 20 is disposed at the first end 110 of the housing 10; the first cap plate assembly 20 includes a first cap plate 210 and a first electrode assembly 220 disposed on the first cap plate 210; the second cover assembly 30 is disposed at the second end 120 of the housing 10; the second cap assembly 30 includes a second cap plate 310 and a second electrode assembly 320 provided on the second cap plate 310; the battery cell 40 is disposed in the housing 10, the battery cell 40 includes a battery cell main body 410, a first tab 420 and a second tab 430, the first tab 420 and the second tab 430 with opposite polarities extend from opposite ends of the battery cell main body 410, the first tab 420 is directly connected to the first electrode assembly 220, and the second tab 430 is directly connected to the second electrode assembly 320.
In the battery provided by the application, the first cover plate assembly 20 comprises the first cover plate 210 and the first electrode assembly 220 arranged on the first cover plate 210, and the first tab 420 is directly connected to the first electrode assembly 220, namely, the first tab 420 realizes direct connection with the first electrode assembly 220, so that the adoption of a switching piece to be electrically connected with the first electrode assembly 220 is avoided; meanwhile, the second cover assembly 30 includes the second cover 310 and the second electrode assembly 320 disposed on the second cover 310, and the second tab 430 is directly connected to the second electrode assembly 320, i.e. the second tab 430 realizes direct connection with the second electrode assembly 320, so that the use of a switching piece to electrically connect with the second electrode assembly 320 is avoided. By directly connecting the first tab 420 with the first electrode assembly 220, the second tab 430 is directly connected with the second electrode assembly 320, in terms of the battery manufacturing process: the welding process of welding the lug and the switching piece and welding the switching piece and the pole is reduced, and one welding process is reduced, so that the welding tool is reduced, the production efficiency is improved, and the product yield is improved; in terms of battery performance: after the lug and the pole of the battery core are directly connected to reduce the switching piece, the internal resistance of the switching piece is reduced, the ohmic internal resistance of the battery is reduced, the rate performance is improved, meanwhile, the contact internal resistance of the pole is reduced, the heat generation of the pole is reduced, and the safety of the battery is improved.
In the embodiment of the application, the battery may be a square battery, that is, the battery may be a quadrangular battery, where the quadrangular battery mainly refers to a prismatic shape, but whether each side of the prism is necessarily a straight line in a strict sense is not strictly limited, and corners between sides are not necessarily right angles, and may be arc transitions. The quadrangular type battery can be a laminated battery, is convenient to group, and can be processed to obtain a battery with longer length. Of course, the battery may be a cylindrical battery, which is not limited in this application.
Specifically, the battery cell 40 refers to a unit formed by winding or laminating a stacked portion including a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. Wherein the polarities of the first electrode and the second electrode are interchangeable. The first tab 420 is connected to the first electrode, and the second tab 430 is connected to the second electrode.
The battery cell 40 may be a laminated battery cell, where the laminated battery cell has a first electrode, a second electrode opposite to the first electrode, and a diaphragm disposed between the first electrode and the second electrode, and the laminated battery cell is formed by stacking multiple pairs of the first electrode and the second electrode. Alternatively, the battery may be a wound battery, i.e., a first electrode, a second electrode opposite to the first electrode, and a separator disposed between the first electrode and the second electrode are wound to obtain a wound battery cell.
In the embodiment of the present application, as shown in fig. 7 to 10, the first electrode assembly 220 includes a first pole 2210 and a first tab connection portion 2220 connected to the first pole 2210, the first tab connection portion 2220 is located at a side of the cover plate facing the second end 120, and a fixed limit for the first pole 2210 facing one end of the battery cell 40 is formed by the first tab connection portion 2220. The second electrode assembly 320 includes a second post 3210 and a second tab connection portion 3220 connected to the second post 3210, wherein the second tab connection portion 3220 is located at a side of the cover plate facing the first end 110, and a fixing limit for the second post 3210 facing one end of the battery cell 40 is formed by the second tab connection portion 3220.
In the embodiment of the present application, as shown in fig. 8, the first tab connection portion 2220 has a flat plate shape. The first cover plate 210 is provided with a mounting hole, the first electrode assembly 220 is assembled on the mounting hole, the first pole 2210 penetrates through the mounting hole, the first pole lug connection part 2220 is positioned on one side of the first cover plate 210 close to the battery cell 40, and the first pole lug connection part 2220 and the first pole 2210 are fixedly connected together to form a fixed limit for one end of the first pole 2210 facing the battery cell 40; the first tab connection portion 2220 cooperates with a pole fixing portion located on the outer surface of the first cover plate 210 to form clamping and fixing of the first pole 2210 on two sides of the first cover plate 210.
For example, a through hole is formed in the first tab connection portion 2220, the end portion of the first pole 2210 is located in the through hole of the first tab connection portion 2220, then the end portion of the first pole 2210 is clamped with the first tab connection portion 2220, a limit that the first pole 2210 exits towards the outer side of the mounting hole is formed through the first tab connection portion 2220, and fixing of the first pole 2210 is formed. The end surface of the first pole 2210 in the through hole is flush with the surface of the first tab connection portion 2220 facing the side of the battery core 40, so that the first pole 2210 is welded with the first tab connection portion 2220. Alternatively, the first tab connection portion 2220 is not provided with a through hole into which the first pole 2210 extends, and the first tab connection portion 2220 and the first pole 2210 are directly and fixedly connected together by welding or other manners.
The side of the first tab connection portion 2220 near the first cover plate 210 abuts against the first cover plate 210, and since the first tab connection portion 2220 is in a flat plate shape, that is, the first tab connection portion 2220 is tightly attached to the first cover plate 210, the first cover plate 210 can provide a supporting function for the first tab connection portion 2220. When the first tab 420 is directly welded on the surface of the first tab connection portion 2220 facing the battery core 40, the first tab connection portion 2220 is supported by the first cover plate 210, so that the first tab 420 is conveniently ultrasonically welded on the first tab connection portion 2220, the occurrence of the conditions of cold joint and the like is avoided, and the welding reliability is improved.
The first cover plate 210 is rectangular, and the first tab connection portion 2220 is matched with the first cover plate 210 to be rectangular, so that the function of fixing the first pole 2210 is achieved, and a welding area welded with the first tab 420 is provided.
In the embodiment of the present application, in the length direction of the first cover plate 210, the length of the first tab connection portion 2220 is 1/4 to 3/4, for example, 1/4, 2/4, 3/4, etc., of the length of the first cover plate 210, which is not specifically described herein. By making the length of the first tab connection portion 2220 1/4 to 3/4 of the length of the first cap plate 210, the first tab connection portion 2220 can provide a sufficient welding area, facilitating welding of the first tab 420 and the first tab connection portion 2220.
Specifically, the first tab 420 is formed by stacking a plurality of first sub-tabs located at the end of the battery cell 40, that is, the first tab 420 is a first tab cluster formed by stacking a plurality of first sub-tabs. The height of the first tab cluster is 1.5 to 3 times, for example, 1.5, 1.7, 1.8, 2, 2.2, 2.4, 2.5, 2.8, 3 times, etc., the thickness of the cell body 410 in the direction in which the first tab 420 extends from the cell body 410, which is not specifically recited herein. By enabling the height of the first tab cluster to be 1.5-3 times of the thickness of the battery core main body 410, the situation that the ratio of the height of the first tab cluster to the thickness of the battery core main body 410 is too small to cause the stacking fault of a plurality of first sub-tabs in the first tab cluster to be serious, poor welding is affected, and meanwhile, when the ratio of the height of the first tab cluster to the thickness of the battery core main body 410 is too large, too long tabs occupy the internal space of the battery core, and the improvement of the energy density of the battery is not facilitated is avoided. Of course, the ratio of the height of the first tab cluster to the thickness of the battery cell body 410 may be less than 1.5 or greater than 3, which is not limited in this application.
Specifically, a cell 40 is provided in the battery case 10 to increase the energy density of the battery.
The height of the first tab 420 of the battery cell 40 is 17mm to 60mm, that is, the height of the first tab cluster is 17mm to 60mm, for example, 17mm, 17.5mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, etc., which are not specifically mentioned herein. The height of the first tab cluster is 17-60 mm, so that the first sub-tab faults in the first tab cluster are fewer, welding quality is guaranteed, meanwhile, excessive occupation of the internal space of the battery core is avoided, and the energy density of the battery is improved. Of course, the height of the first tab cluster may be less than 17mm or greater than 60mm, which is not limited in this application.
The thickness of the cell body 410 is 15mm to 50mm, for example, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, etc., which are not specifically mentioned herein.
The length of the cell body 410 is 150mm to 300mm, for example, 150mm, 170mm, 190mm, 200mm, 220mm, 240mm, 250mm, 260mm, 280mm, 300mm, etc., which are not specifically mentioned herein.
In the embodiment of the present application, the first cap plate 210 includes a first cap plate body 2110 and a first insulating member 2120, the first insulating member 2120 is located at a side of the first cap plate body 2110 toward the second end 120, and the first tab connection portion 2220 is located at a side of the first insulating member 2120 toward the second end 120. Insulation between the battery cell 40 and the first cover body 2110 made of metal is formed by the first insulator 2120. The first insulating member 2120 may be, for example, a lower plastic.
Wherein, the first insulator 2120 has a first avoiding space formed thereon, and the first tab connection portion 2220 is located in the first avoiding space. The first tab 420 is directly welded on the first tab connection portion 2220 by positioning the first tab connection portion 2220 in the first avoidance space, so that the internal space of the discharge core is further released, and the improvement of the battery energy density is facilitated; meanwhile, the first tab connection portion 2220 is arranged in the first avoidance space, so that the first avoidance space is used for positioning the assembly of the first tab connection portion 2220, and the assembly accuracy of the first tab connection portion 2220 is improved.
Wherein, the first avoidance space and the shape and the size may be matched with the shape and the size of the first tab connection portion 2220 to further form the positioning of the first tab connection portion 2220 assembled on the first cover plate 210.
The depth of the first avoiding space is not less than the thickness of the first tab connection portion 2220, so that the first tab connection portion 2220 is completely contained in the first avoiding space, and the problems that the edge of the first tab connection portion 2220 scratches the battery cell 40 are avoided.
Wherein, the first insulating member 2120 is provided with a positioning protrusion, the first tab connection portion 2220 is provided with a fusing hole, the positioning protrusion is located in the fusing hole, so as to form assembly positioning for the first tab connection portion 2220, and avoid deviation of the assembly position of the first tab connection portion 2220; the first tab connection portion 2220 can timely fuse and break the circuit through the fusing hole when the current is overlarge, and the safety problem caused by overlong short circuit time of the battery cell is avoided.
As shown in fig. 11 and fig. 12, after the first tab 420 is welded to the first tab connection portion 2220, a bending portion 440 is formed on the first tab 420, thereby avoiding excessive occupation of the internal space of the battery cell, and being beneficial to improving the energy density of the battery.
In the embodiment of the present application, as shown in fig. 10, the second lug connection portion 3220 has a flat plate shape. The second cover plate 310 is provided with a mounting hole, the second electrode assembly 320 is assembled on the mounting hole, the second pole 3210 penetrates through the mounting hole, the second lug connection part 3220 is positioned on one side of the second cover plate 310 close to the battery cell 40, and the second lug connection part 3220 and the second pole 3210 are fixedly connected together to form a fixed limit for one end of the second pole 3210 facing the battery cell 40; the first tab connection portion 2220 cooperates with a pole fixing portion located on the outer surface of the first cover plate 210 to form clamping and fixing of the first pole 2210 on two sides of the first cover plate 210.
For example, a through hole is formed in the second ear connection portion 3220, an end portion of the second pole 3210 is located in the through hole of the second ear connection portion 3220, then the end portion of the second pole 3210 is clamped with the second ear connection portion 3220, a limit that the second pole 3210 withdraws towards the outer side of the mounting hole is formed through the second ear connection portion 3220, and fixing of the second pole 3210 is formed. The end surface of the second post 3210 located in the through hole is flush with the surface of the second lug connection portion 3220 facing the side of the battery core 40, so that the second post 3210 and the second lug connection portion 3220 are welded. Alternatively, the second lug connection portion 3220 is not provided with a through hole into which the second pole 3210 extends, and the second lug connection portion 3220 and the second pole 3210 are directly and fixedly connected together by welding or the like.
Wherein, the first tab connection portion 2220 is parallel or substantially parallel to the second tab connection portion 3220. By making the first tab connection portion 2220 parallel to the second tab connection portion 3220, the first tab 420 and the second tab 430 of the battery cell 40 are facilitated to be connected to the first tab connection portion 2220 and the second tab connection portion 3220, respectively.
The second lug connection portion 3220 abuts against the second cover plate 310 on a side close to the second cover plate 310, and the second lug connection portion 3220 is in a flat plate shape, that is, the second lug connection portion 3220 is tightly attached to the second cover plate 310, and the second cover plate 310 can provide a supporting function for the second lug connection portion 3220. When the second tab 430 is directly welded on the surface of the second tab connection portion 3220 facing the battery core 40, the second tab connection portion 3220 is supported by the second cover plate 310, so that the second tab 430 is conveniently ultrasonically welded on the second tab connection portion 3220, the occurrence of the conditions of cold welding and the like is avoided, and the welding reliability is improved.
The second cover plate 310 is rectangular, and the second lug connection portion 3220 is matched with the second cover plate 310 to be rectangular, so that the second pole 3210 is fixed, and a welding area welded with the second lug 430 is provided.
In the embodiment of the present application, the length of the second ear connection portion 3220 in the length direction of the second cover plate 310 is 1/4 to 3/4, for example, 1/4, 2/4, 3/4, etc., of the length of the second cover plate 310, which is not specifically described herein. By making the length of the second lug connection portion 3220 1/4 to 3/4 of the length of the second cover plate 310, the second lug connection portion 3220 can provide a sufficient welding area to facilitate welding of the second lug 430 and the second lug connection portion 3220.
Specifically, the second tab 430 is formed by stacking a plurality of second sub-tabs located at the end of the battery cell 40, that is, the second tab 430 is a second tab cluster formed by stacking a plurality of second sub-tabs. The height of the second tab cluster is 1.5 to 3 times, for example, 1.5, 1.7, 1.8, 2, 2.2, 2.4, 2.5, 2.8, 3 times, etc., the thickness of the cell body 410 in the direction in which the second tab 430 extends from the cell body 410, which is not specifically recited herein. By enabling the height of the second tab cluster to be 1.5-3 times of the thickness of the battery cell main body 410, the phenomenon that the stacking faults of a plurality of second sub-tabs in the second tab cluster are serious when the ratio of the height of the second tab cluster to the thickness of the battery cell main body 410 is too small and poor welding is caused by influencing welding is avoided, and meanwhile, when the ratio of the height of the second tab cluster to the thickness of the battery cell main body 410 is too large, too long tabs occupy the internal space of the battery cell and are not beneficial to improving the energy density of the battery is avoided. Of course, the ratio of the height of the second tab cluster to the thickness of the cell body 410 may also be less than 1.5 or greater than 3, which is not limited in this application.
Specifically, a cell 40 is provided in the battery case 10 to increase the energy density of the battery.
The height of the second tab 430 is 17mm to 60mm, i.e., the height of the second tab cluster is 17mm to 60mm, for example, 17mm, 17.5mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, etc., which are not specifically mentioned herein. The height of the second tab cluster is 17-60 mm, so that the plurality of second sub-tab faults in the second tab cluster are fewer, the welding quality is ensured, and meanwhile, the situation that excessive occupation of the internal space of the battery core is avoided, and the energy density of the battery is improved. Of course, the height of the second ear cluster may also be less than 17mm or greater than 60mm, which is not limited in this application.
The thickness of the cell body 410 is 15mm to 50mm, for example, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, etc., which are not specifically mentioned herein.
The length of the cell body 410 is 150mm to 300mm, for example, 150mm, 170mm, 190mm, 200mm, 220mm, 240mm, 250mm, 260mm, 280mm, 300mm, etc., which are not specifically mentioned herein.
In the embodiment of the present application, the second cover 310 includes a second cover body 3110 and a second insulating member 3120, the second insulating member 3120 being located on a side of the second cover body 3110 toward the second end 120, and the second ear connection 3220 being located on a side of the second insulating member 3120 toward the second end 120. Insulation between the battery cell 40 and the second cover body 3110 made of metal is formed by the second insulating member 3120. The second insulating member 3120 may be, for example, a lower plastic.
Wherein a second relief space is formed in second insulating member 3120 and second ear connection portion 3220 is positioned in the second relief space. By positioning the second lug connection portion 3220 in the second avoidance space, the second lug 430 is directly welded on the second lug connection portion 3220, and the inner space of the discharge core is further released, so that the improvement of the battery energy density is facilitated; meanwhile, the second lug connection portion 3220 is arranged in the second avoidance space, so that the second avoidance space is used for positioning the assembly of the second lug connection portion 3220, and the assembly accuracy of the second lug connection portion 3220 is improved.
Wherein the second avoidance space and shape and size may be matched with the shape and size of the second tab connection 3220 to further form a location for the second tab connection 3220 to be assembled on the second cover plate 310.
The depth of the second avoidance space is not less than the thickness of the second electrode ear connecting portion 3220, so that the second electrode ear connecting portion 3220 is completely contained in the second avoidance space, and the problem that the edge of the second electrode ear connecting portion 3220 scratches the battery cell 40 is avoided.
Wherein, the second insulating member 3120 is provided with a positioning protrusion, the second ear connecting portion 3220 is provided with a positioning hole, and the positioning protrusion is located in the positioning hole to form positioning for assembling the second ear connecting portion 3220, so as to avoid deviation of the assembling position of the second ear connecting portion 3220.
After the second lug 430 is welded to the second lug connection portion 3220, a bending portion is formed on the second lug 430, so that excessive occupation of the internal space of the battery core is avoided, and energy density of the battery is improved.
In an embodiment of the present application, the battery further includes: explosion-proof valve, explosion-proof valve is provided on explosion-proof hole 130. The housing 10 includes two opposing first surfaces 140 and two opposing second surfaces 150, the first surfaces 140 and the second surfaces 150 being alternately connected in the circumferential direction of the housing 10.
The area of the first surface 140 is larger than that of the second surface 150, and the second surface 150 is provided with the explosion-proof hole 130. By providing the explosion-proof hole 130 on the second surface 150 having a smaller area, when stacking a plurality of cells into a group, the surfaces of the largest areas of the plurality of cells can be stacked together, i.e., the stacking direction of the plurality of cells is perpendicular to the largest surfaces of the cells. The stacking direction of the plurality of cells is perpendicular to the maximum surface of the cells, so that the space occupied by the plurality of cells after being stacked is smaller, and the energy density of the plurality of cells after being grouped can be relatively improved. Of course, the explosion-proof hole 130 may also be disposed on the first surface 140, which is not limited in this application.
Wherein, the battery still includes protection paster 50, and protection paster 50 is connected on casing 10, shelters from explosion-proof hole 130 through protection paster 50, can realize the reliable protection to the explosion-proof valve, avoids the explosion-proof valve to be damaged under normal use state.
In the embodiment of the present application, the first cover plate assembly 20 and/or the second cover plate assembly 30 are provided with a filling hole 230, and electrolyte is filled into the casing 10 through the filling hole 230. The liquid injection hole 230 is provided with a sealing plug to seal the liquid injection hole 230.
An embodiment of the present utility model also provides a battery pack including the above battery.
The battery pack according to an embodiment of the present utility model includes a battery, the first cover plate assembly 20 includes a first cover plate 210 and a first electrode assembly 220 disposed on the first cover plate 210, and the first tab 420 is directly connected to the first electrode assembly 220, i.e., the first tab 420 realizes direct connection with the first electrode assembly 220, and avoids electrical connection with the first electrode assembly 220 by using a switching piece; meanwhile, the second cover assembly 30 includes the second cover 310 and the second electrode assembly 320 disposed on the second cover 310, and the second tab 430 is directly connected to the second electrode assembly 320, i.e. the second tab 430 realizes direct connection with the second electrode assembly 320, so that the use of a switching piece to electrically connect with the second electrode assembly 320 is avoided. By directly connecting the first tab 420 with the first electrode assembly 220, the second tab 430 is directly connected with the second electrode assembly 320, in terms of the battery manufacturing process: the welding process of welding the lug and the switching piece and welding the switching piece and the pole is reduced, and one welding process is reduced, so that the welding tool is reduced, the production efficiency is improved, and the product yield is improved; in terms of battery performance: after the lug and the pole of the battery core are directly connected to reduce the switching piece, the internal resistance of the switching piece is reduced, the ohmic internal resistance of the battery is reduced, the rate performance is improved, meanwhile, the contact internal resistance of the pole is reduced, the heat generation of the pole is reduced, and the safety of the battery pack is improved.
In one embodiment, the battery pack is a battery module or a battery pack.
The battery module includes a plurality of batteries, and the battery can be square battery, and the battery module can also include end plate and curb plate, and end plate and curb plate are used for fixed a plurality of batteries. The battery may be a cylindrical battery, and the cylindrical battery may be disposed on the support plate, thereby forming a battery module.
The battery pack comprises a plurality of batteries and a battery box body, wherein the battery box body is used for fixing the plurality of batteries.
It should be noted that the battery pack includes a plurality of batteries, and the plurality of batteries are disposed in the battery case. The batteries can form a battery module and then are arranged in the battery box body. Or, a plurality of batteries can be directly arranged in the battery box body, namely, the batteries do not need to be grouped, and the batteries are fixed by the battery box body.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (16)

1. A battery, comprising:
-a housing (10), the housing (10) comprising opposite first (110) and second (120) ends;
a first cover assembly (20), the first cover assembly (20) being disposed at the first end (110) of the housing (10); the first cover plate assembly (20) comprises a first cover plate (210) and a first electrode assembly (220) arranged on the first cover plate (210);
a second cover assembly (30), the second cover assembly (30) being disposed at the second end (120) of the housing (10); the second cap assembly (30) includes a second cap plate (310) and a second electrode assembly (320) provided on the second cap plate (310);
the battery cell (40), electric core (40) set up in casing (10), electric core (40) include electric core main part (410), first utmost point ear (420) and second utmost point ear (430), polarity is opposite first utmost point ear (420) with second utmost point ear (430) are by electric core main part (410)'s opposite both ends extend out, first utmost point ear (420) lug direct connection in on first electrode assembly (220), second utmost point ear (430) lug direct connection in on second electrode assembly (320).
2. The battery of claim 1, wherein the first electrode assembly (220) comprises a first tab connection (2220) connected to the first tab (2210) and a first post (2210), the first tab connection (2220) being located on a side of the first cover plate (210) facing the second end (120), the first tab (420) being directly connected to a surface of the first tab connection (2220) facing away from the first cover plate (210);
the second electrode assembly (320) comprises a second pole (3210) and a second lug connection part (3220) connected with the second pole (3210), the second lug connection part (3220) is positioned on one side of the second cover plate (310) facing the first end (110), and the second lug (430) is directly connected to the surface of the second lug connection part (3220) facing away from the second cover plate (310).
3. The battery according to claim 2, wherein the first tab connection portion (2220) and the second tab connection portion (3220) are in a flat plate shape.
4. A battery according to claim 3, wherein the first tab connection (2220) is parallel to the second tab connection (3220).
5. A battery according to claim 3, wherein a side of the first tab connection portion (2220) close to the first cover plate (210) is in contact with the first cover plate (210), and a side of the second tab connection portion (3220) close to the second cover plate (310) is in contact with the second cover plate (310).
6. The battery according to claim 2, wherein the first tab (420) is welded to a surface of the first tab connection (2220) facing away from the first cover plate (210); and/or the number of the groups of groups,
the second lug (430) is welded to the surface of the second lug connection (3220) facing away from the second cover plate (310).
7. The battery according to claim 2, wherein the length of the first tab connection portion (2220) in the length direction of the first cap plate (210) is 1/4 to 3/4 of the length of the first cap plate (210); in the length direction of the second cover plate (310), the length of the second lug connection part (3220) is 1/4-3/4 of the length of the second cover plate (310).
8. The battery of claim 2, wherein the first cover plate (210) includes a first cover plate body (2110) and a first insulator (2120), the first insulator (2120) being located on a side of the first cover plate body (2110) toward the second end (120), the first tab connection (2220) being located on a side of the first insulator (2120) toward the second end (120); wherein a first avoiding space is formed on the first insulating member (2120), and the first tab connection portion (2220) is located in the first avoiding space; and/or the number of the groups of groups,
the second cover plate (310) comprises a second cover plate body (3110) and a second insulating member (3120), the second insulating member (3120) being located on a side of the second cover plate body (3110) facing the first end (110), the second ear connection (3220) being located on a side of the second insulating member (3120) facing the first end (110); wherein, a second avoidance space is formed on the second insulating member (3120), and the second ear connection part (3220) is positioned in the second avoidance space.
9. The battery according to claim 1, wherein the height of the first tab (420) is 1.5 to 3 times the thickness of the cell body (410) along the direction in which the first tab (420) extends from the cell body (410); the height of the second lug is 1.5-3 times of the thickness of the battery cell main body (410) along the direction that the second lug extends from the battery cell main body (410).
10. The battery according to claim 9, wherein the first tab (420) has a height of 17mm to 60mm and the second tab has a height of 17mm to 60mm.
11. The battery according to claim 9, wherein the thickness of the cell body (410) is 15mm to 50mm.
12. The battery of claim 1, wherein the battery is a quadrangular type battery.
13. The battery according to claim 1, characterized in that only one of the cells (40) is provided in the housing (10).
14. The battery according to claim 1, characterized in that the casing (10) is provided with explosion-proof holes (130), the battery further comprising: and the explosion-proof valve is arranged on the explosion-proof hole (130).
15. The battery according to claim 14, wherein the housing (10) comprises two opposing first surfaces (140) and two opposing second surfaces (150), the first surfaces (140) having an area greater than an area of the second surfaces (150), the explosion proof aperture (130) being disposed on the second surfaces (150).
16. The battery according to claim 1, wherein the first cover plate assembly (20) and/or the second cover plate assembly (30) are/is provided with a liquid injection hole (230).
CN202320579568.8U 2023-03-22 2023-03-22 Battery cell Active CN219371286U (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202320579568.8U CN219371286U (en) 2023-03-22 2023-03-22 Battery cell
DE202023102991.4U DE202023102991U1 (en) 2023-03-22 2023-05-31 battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202320579568.8U CN219371286U (en) 2023-03-22 2023-03-22 Battery cell

Publications (1)

Publication Number Publication Date
CN219371286U true CN219371286U (en) 2023-07-18

Family

ID=87068253

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202320579568.8U Active CN219371286U (en) 2023-03-22 2023-03-22 Battery cell

Country Status (2)

Country Link
CN (1) CN219371286U (en)
DE (1) DE202023102991U1 (en)

Also Published As

Publication number Publication date
DE202023102991U1 (en) 2023-06-16

Similar Documents

Publication Publication Date Title
CN216850226U (en) Battery pack
CN111463367B (en) Secondary battery and battery module
CN217562767U (en) Secondary battery assembly structure and secondary battery
CN216850253U (en) Battery and battery pack
CN219180703U (en) Special-shaped battery
CN219677509U (en) Battery cell
CN219959342U (en) Battery cell
CN218957983U (en) Battery cell
CN218919232U (en) Battery cell
CN219371286U (en) Battery cell
CN218731628U (en) Battery with a battery cell
CN217086828U (en) Battery and battery pack
CN216980824U (en) Battery with a battery cell
CN116154417A (en) Battery cell
CN114725477A (en) Battery cell unit, battery and assembly method of battery
CN219575888U (en) Battery cell
CN219534815U (en) Battery and battery pack
CN219759899U (en) Battery cell
CN220553565U (en) Battery cell and battery device
CN221596606U (en) Battery cell
CN221201483U (en) Battery and battery pack
CN217589369U (en) Battery with a battery cell
CN217086814U (en) Battery and battery pack
CN220774686U (en) Battery cell
CN218769808U (en) Battery pack

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant