CN217361638U

CN217361638U - Battery with a battery cell

Info

Publication number: CN217361638U
Application number: CN202123394548.3U
Authority: CN
Inventors: 徐鑫; 郑俊超
Original assignee: Sany Technology Equipment Co Ltd
Current assignee: Sany Technology Equipment Co Ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-09-02
Anticipated expiration: 2031-12-29

Abstract

The utility model provides a battery relates to lithium cell technical field, including casing, end cover and electric core, be equipped with the holding chamber in the casing, the holding chamber possesses the opening side, and the end cover is connected with the casing and the opening side is located to the lid, and electric core places in the casing, and at least one in the top of electric core and the bottom is formed with the recess, and the groove is equipped with the piece that converges, and piece one end that converges is connected with electric core, and the other end is connected with casing or end cover. In the mode, at least one of the top and the bottom of the battery cell is provided with the groove, the bus bar is positioned at the groove, the battery cell is manufactured by winding after coating, during coating, the whole current collector is completely coated, no empty foil area is reserved, and the uncoated part is only the grooved part, so that compared with the existing battery cell, the coating area of the active material is increased, and the energy density is increased.

Description

Battery with a battery cell

Technical Field

The utility model relates to a lithium cell design technical field especially relates to a battery.

Background

In the prior art, a lithium battery comprises a cylindrical battery and a square battery, the cylindrical battery structurally comprises a shell, an end cover, a pole piece, a positive pole piece, a negative pole piece and a diaphragm, the pole piece is formed by winding after the positive pole piece and the negative pole piece are compounded, the pole piece is placed in the shell, and the pole lugs are respectively led out of the positive pole piece and the negative pole piece and are respectively connected with the shell and the end cover.

For a full-tab battery cell, when active materials are coated on a positive electrode and a negative electrode, one side of the positive electrode and the negative electrode needs to be respectively reserved to be used as a tab area and also correspond to a blank foil area, so that the coating area of the positive electrode and the negative electrode is reduced, and the reduction of an active material layer can lead to the reduction of energy density.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a battery for solve among the prior art positive negative pole coating area relatively less and cause the not enough technical problem of battery energy density.

An embodiment of the utility model provides a battery, include: a housing having an accommodating chamber therein, the accommodating chamber having an open side;

the end cover is connected with the shell and covers the opening side;

the battery cell is placed in the shell, at least one of the top and the bottom of the battery cell is provided with a groove, a bus sheet is arranged at the groove, one end of the bus sheet is connected with the battery cell, and the other end of the bus sheet is connected with the shell or the end cover.

According to the battery provided by the utility model, the battery core comprises a positive plate, a diaphragm and a negative plate which are arranged in sequence, the diaphragm is positioned between the positive plate and the negative plate, and the positive plate and the negative plate are arranged in a staggered manner relative to the diaphragm;

the positive plate is close to one side of the end cover and forms a protruding part of the positive plate relative to the diaphragm, the negative plate is far away from one side of the end cover and forms a protruding part of the negative plate relative to the diaphragm, and the groove is formed in the protruding part of the positive plate and/or the protruding part of the negative plate.

According to the utility model discloses a battery, the top and the bottom of electricity core all are equipped with the recess, electricity core is close to what end cover one side is first recess, electricity core is kept away from what end cover one side is the second recess.

According to the battery provided by the utility model, the confluence sheet is attached in the first groove and is a positive pole confluence sheet, and the positive pole confluence sheet is simultaneously connected with the extending part of the positive pole sheet and the end cover;

the bus piece is attached to the second groove and is a negative bus piece, and the negative bus piece is connected with the extending part of the negative plate and the shell.

the shell is far away from one side of the opening side, a matching bulge which is matched with the shape of the second groove and is attached to the second groove is formed.

According to the utility model discloses a battery of embodiment, be equipped with at least one discharge orifice on the busbar.

According to the utility model discloses a battery, the busbar includes main part and extension, the extension is located main part at least one side and with the main part is connected, the main part with the recess is laminated mutually, the main part with be equipped with at least one on the extension respectively cross the discharge orifice.

According to the utility model discloses a battery, the relative both sides of main part all are equipped with the extension, the extension with the positive plate and/or the extension of negative pole piece is connected.

According to the utility model discloses a battery, the end cover with be equipped with insulating seal between the casing, insulating seal encircles end cover periphery side sets up.

According to the utility model discloses a battery, the electricity core center is formed with the stay tube, seted up on the end cover and annotated the liquid mouth, annotate the liquid mouth with stay tube inner chamber intercommunication.

The embodiment of the utility model provides a battery, at least one in the top of electric core and the bottom is formed with the recess, and the busbar is located the recess position, and electric core adopts coiling behind the coating to make, and during the coating, whole mass flow body is coated completely, does not leave empty paper tinsel district, and uncoated only is the fluting part, for current electric core, has increased active material's coating area, and then has increased energy density.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the structure shown at A in FIG. 1;

FIG. 3 is a schematic structural diagram of one embodiment of the bus bar of FIG. 1;

fig. 4 is a schematic structural diagram of another embodiment of a battery according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of the bus bar shown in FIG. 4;

FIG. 6 is a schematic structural view of another embodiment of the battery shown in FIG. 1;

reference numerals:

10. a housing; 110. an accommodating cavity; 120. an opening side; 130. a limiting part; 140. a mating protrusion;

20. an end cap; 210. a liquid injection port; 220. filling a liquid plug;

30. an electric core; 310. a groove; 3110. a first groove; 3120. a second groove; 320. a confluence sheet; 3210. a positive bus bar; 3220. a negative bus bar; 3230. an overflowing hole; 3240. a main body portion; 3250. an extension portion; 330. a positive plate; 340. a negative plate; 350. a diaphragm; 360. a central bore;

40. an insulating seal;

50. an explosion-proof valve.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.

Referring to fig. 1 to 6, an embodiment of the present invention provides a battery, including a casing 10, an end cover 20 and a battery cell 30, a holding cavity 110 is disposed in the casing 10, the holding cavity 110 has an opening side 120, the end cover 20 is connected to the casing 10 and covers the opening side 120, the battery cell 30 is disposed in the casing 10, at least one of the top and the bottom of the battery cell 30 is formed with a groove 310, a current collecting plate 320 is disposed at the groove 310, one end of the current collecting plate 320 is connected to the battery cell 30, and the other end of the current collecting plate is connected to the casing 10 or the end cover 20.

In the prior art, two opposite sides of the electrical core 30 are respectively protruded to serve as tab areas, the tabs are communicated with the casing 10 or the end cap 20 for conduction, the current collector of the electrical core 30 does not coat the protruded portions when coating active materials, so that the surfaces of the positive electrode and the negative electrode cannot be completely coated, and the energy density is reduced. In some embodiments of the present invention, the entire current collector may be completely coated, and then the groove 310 is formed in at least one of the top and the bottom of the electrical core 30, the sink sheet 320 is disposed at the groove 310, and the sink sheet 320 is connected to the end cap 20 and/or the casing 10. That is, the battery core 30 is made by winding after coating, and when coating, the whole current collector is completely coated without leaving a hollow foil area, and the uncoated part is only a slotted part, so that compared with the existing battery core 30, the coating area of the active material is increased, and further, the energy density is increased.

Referring to fig. 1 and fig. 2, in some embodiments of the present invention, for the structure of the battery cell 30, the battery cell 30 includes a positive plate 330, a separator 350, and a negative plate 340 that are arranged at intervals, the positive plate 330, the separator 350, and the negative plate 340 are wound, and the positive plate 330 and the negative plate 340 are both formed by coating an active material on a current collector. The positive electrode plate 330 is extended from the end cap 20 and connected to the end cap 20, and the negative electrode plate 340 is extended from the end cap 20 and connected to the casing 10.

It should be noted that, in the embodiment of the present invention, the positive plate 330, the negative plate 340 and the separator 350 are wound to form the electrical core 30, that is, the separator 350 is disposed between the positive plate 330 and the negative plate 340, and then wound to form the electrical core with the supporting core as an axis. In other embodiments, for example, the positive electrode tab 330, the separator 350, and the negative electrode tab 340 are stacked and disposed in the above-mentioned slotted structure, which is not limited herein.

Further, the positive electrode tab 330 and the negative electrode tab 340 are arranged in a staggered manner from the separator 350, that is, the positive electrode tab 330 and the negative electrode tab 340 are spaced apart from each other with the separator 350 as a center, thereby preventing a short circuit condition from occurring. The side of the positive electrode tab 330 close to the end cap 20 forms an extension of the positive electrode tab 330 relative to the separator 350, and the side of the negative electrode tab 340 remote from the end cap 20 forms an extension of the negative electrode tab 340 relative to the separator 350. The groove 310 is formed at the protruding portion of the positive electrode tab 330 and/or the protruding portion of the negative electrode tab 340.

For the groove 310, the grooves 310 may be formed at the top and the bottom of the battery cell 30, a first groove 3110 is formed at one side of the battery cell 30 close to the end cap 20, a second groove 3120 is formed at one side of the battery cell 30 away from the end cap 20, the positive electrode bus bar 3210 is attached to the first groove 3110, and the negative electrode bus bar 3220 is attached to the second groove 3120; the first groove 3110 is opened at the protruding portion of the positive electrode tab 330, and the second groove 3120 is opened at the protruding portion of the negative electrode tab 340.

For the bus bar 320, in some embodiments of the present invention, the number of the bus bar 320 is two, and one of the bus bar is attached to the first groove 3110 and is the positive bus bar 3210. The other one is attached in the second groove 3120 and is a negative bus bar 3220, the positive bus bar 3210 is connected to the protruding portion of the positive bar 330 and the end cap 20, and the negative bus bar 3220 is connected to the protruding portion of the negative bar 340 and the housing 10.

When the positive plate 330, the negative plate 340 and the separator 350 are wound, the separator 350 may be placed between the positive plate 330 and the negative plate 340, and then one end of the positive plate 330 is disposed to protrude from one side of the separator 350, one end of the negative plate 340 far away from the positive plate 330 is also disposed to protrude from the separator 350, and the separator 350 is located between the positive plate 330 and the negative plate 340 to prevent the positive plate 330 and the negative plate 340 at two sides of the separator 350 from contacting. When the winding is completed, a first groove 3110 is formed at the portion of the positive electrode tab 330 protruding therefrom, and a second groove 3120 is formed at the portion of the negative electrode tab 340 protruding therefrom. The slotting method can be, but is not limited to, laser cleaning or die cutting, the positive electrode bus sheet 3210 is located in the first groove 3110, one end of the positive electrode bus sheet is welded with the positive electrode sheet 330, and the other end of the positive electrode bus sheet 3210 is welded with the end cover 20. The negative bus bar 3220 is positioned in the second groove 3120 and has one end welded to the negative electrode tab 340 and the other end of the negative bus bar 3220 welded to the case 10.

In practical applications, one of the first groove 3110 and the second groove 3120 may be selected or both of the first groove 3110 and the second groove 3120 may be opened. That is, optionally, one side of the battery cell 30 may be slotted, or both sides may be slotted, which is not limited herein.

For the case of one-sided slotting: optionally, the first groove 3110 may be formed, and the second groove 3120 may not be formed; alternatively, the second groove 3120 may be selectively opened without opening the first groove 3110, or both the first groove 3110 and the second groove 3120 may be opened.

If only one of the sides is selected: for example, only the first groove 3110 is formed, a part of the coating area is removed by cleaning at the edge of the positive plate 330, so as to form a blank foil area, and the blank foil area is used for welding a tab, and the tab is connected with the end cover 20. Similarly, if only the second groove 3120 is selected to be opened, a part of the coating area is removed by cleaning at the edge of the negative electrode sheet 340, so as to form a blank foil area, where the blank foil area is used for welding a tab, and the tab is connected with the casing 10.

The utility model discloses an in some embodiments to set up first recess 3110 and second recess 3120 simultaneously and explain as the example, saved the step of welding utmost point ear, so make lithium battery manufacturing procedure simpler, the step still less, and coated active material's area is also bigger relatively, and then has increased energy density.

Referring to fig. 3 to 5, in some embodiments of the present invention, at least one overflowing hole 3230 is disposed on the bus bar 320, and the overflowing hole 3230 is disposed to facilitate the electrolyte to quickly infiltrate into the battery cell 30. The number of the overflowing holes 3230 may be, but is not limited to, two, three, four or more, and the plurality of overflowing holes 3230 may be arranged in a direction in which the length of the bus bar 320 extends, or may be arranged in multiple rows in the width direction of the bus bar 320, and is not limited thereto. The separator 350 of the lithium battery is a polyolefin porous film which separates the positive electrode sheet 330 and the negative electrode sheet 340 to prevent short circuit due to contact between both electrodes, and allows electrolyte ions to pass therethrough, and the separator 350 is not conductive and is generally made of a high-strength thin film.

With continued reference to fig. 4 and 5, to further increase the wetting rate of the bus bar 320, the bus bar 320 includes a main body portion 3240 and an extending portion 3250 connected to the main body portion 3240, and the main body portion 3240 is attached to the groove 310. When the groove 310 is curved, the main body portion 3240 may be curved to fit into the groove 310. In some embodiments of the present invention, the extension portions 3250 may be formed on two sides of the main body portion 3240, the extension portions 3250 extend toward two sides of the main body portion 3240, the arrangement direction of the flowing holes 3230 may be set at intervals along the main body portion 3240 to the extension direction of the extension portions 3250, or the flowing holes 3230 may be set at intervals in the length direction of the main body portion 3240, and the flowing holes 3230 may be set at intervals in the length direction of the extension portions 3250. Specifically, the end of the extension portion 3250 may be made to extend to the end of the positive electrode tab 330 or the negative electrode tab 340. Taking the axial cross section of the lithium battery as an example, the extending portion 3250 may extend to two sides of the positive plate 330 or the negative plate 340 away from the middle of the electrical core 30, so that the bus bar 320 may contact with the positive plate 330 or the negative plate 340 as much as possible, thereby improving the electrical conductivity of the bus bar 320, and the welding and fixing effect is better.

Referring to fig. 6, in some embodiments of the present invention, a matching protrusion 140 is formed on one side of the housing 10 away from the opening side 120, the matching protrusion 140 is adapted to the shape of the second groove 3120 and is attached to the second groove 3120, and the matching protrusion 140 has the same function as the negative bus bar 3220. That is, the bus bar 320 is not additionally provided, but a partial structure of the housing 10 is selected as the bus bar 320. The corresponding portion of the housing 10 corresponding to the matching protrusion 140 is taken as the bus bar 320, and the negative bus bar 3220 is taken as a portion of the housing 10 at this time, that is, the negative bus bar 3220 is integrally disposed with the housing 10. Therefore, the production process can be simplified, the number of mounting parts is reduced, and the production efficiency is improved. In some embodiments of the present invention, a mounting hole may be formed at the bottom of the housing 10, and the fitting protrusion 140 is welded at the mounting hole. Or the housing 10 and the mating protrusion 140 may be mounted in a snap-fit manner, which is not limited herein.

In some embodiments of the present invention, for example, the negative bus bar 3220 and the housing 10 are integrally formed, the engaging protrusion 140 may be formed by rolling until the engaging protrusion 140 fits into the second groove 3120 and abuts against the protruding portion of the negative plate 340.

Regarding the mounting manner of the housing 10 and the end cap 20, an insulating sealing member 40 may be disposed on the peripheral side of the end cap 20, the insulating sealing member 40 is disposed around the peripheral side of the end cap 20, and the insulating sealing member 40 is used to improve the connection stability between the end cap 20 and the housing 10, and also plays a role of insulation, that is, a role of isolating the housing 10 from the end cap 20.

Further, a center hole 360 is formed in the center of the battery cell 30, a liquid injection port 210 is formed in the end cap 20, the position of the liquid injection port 210 corresponds to the position of the center hole 360, and a liquid injection plug 220 is further arranged at the position of the liquid injection port 210 and used for covering the liquid injection port 210 after liquid injection is completed. After the winding of the battery cell 30 is completed, the support core at the middle of the battery cell 30 is drawn out to form a central hole 360, and then the battery cell is placed in the accommodating cavity 110. After the end cap 20 is covered, electrolyte is injected into the accommodating cavity 110 through the glue injection port.

In order to improve the safety performance of the lithium battery, the end cap 20 or the housing 10 may be provided with an explosion-proof valve 50, and the structure and the installation manner of the explosion-proof valve 50 belong to technical means well known to those skilled in the art, and will not be described herein again.

Further, the housing 10 is recessed near the open side 120 to form a limiting portion 130 for limiting the position of the battery cell 30.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A battery, comprising:

a housing having an accommodating chamber therein, the accommodating chamber having an open side;

the end cover is connected with the shell and covers the opening side;

2. The battery of claim 1, wherein the battery core comprises a positive plate, a diaphragm and a negative plate, which are arranged in sequence, the diaphragm is located between the positive plate and the negative plate, and the positive plate and the negative plate are arranged in a staggered manner relative to the diaphragm;

3. The battery of claim 2, wherein the grooves are formed on the top and the bottom of the cell, the first groove is formed on the side of the cell close to the end cap, and the second groove is formed on the side of the cell away from the end cap.

4. The battery of claim 3, wherein the bus bar is attached to the first groove and is a positive bus bar, and the positive bus bar is connected with the protruding part of the positive bar and the end cap;

5. The battery of claim 3, wherein the bus bar is attached to the first groove and is a positive bus bar, and the positive bus bar is connected with the protruding part of the positive bar and the end cap;

and a matching bulge which is matched with the shape of the second groove and is attached in the second groove is formed on one side of the shell, which is far away from the opening side.

6. The battery of claim 2, wherein the bus bar has at least one flow aperture therein.

7. The battery of claim 6, wherein the bus bar comprises a main body and an extension, the extension is disposed on at least one side of the main body and connected to the main body, the main body is attached to the groove, and the main body and the extension are respectively provided with at least one flow hole.

8. The battery according to claim 7, wherein the extending portions are provided on opposite sides of the main body portion, and the extending portions are connected to the protruding portions of the positive electrode tab and/or the negative electrode tab.

9. The cell defined in claim 1, wherein an insulating seal is disposed between the end cap and the housing, the insulating seal being disposed around an outer peripheral side of the end cap.

10. The battery of claim 1, wherein a support tube is formed in the center of the battery core, and a liquid injection port is formed in the end cap and is communicated with an inner cavity of the support tube.