CN117239360A - Electric core, battery monomer, battery and electric equipment - Google Patents

Abstract

The application relates to an electric core, a battery monomer, a battery and electric equipment. The battery cell comprises a battery cell body and a plurality of first electrode lugs, wherein the battery cell body is provided with a first end face and a second end face which are opposite to each other, and the battery cell body is also provided with a through hole penetrating through the first end face and the second end face; each first tab is attached to the first end face and is provided with a connecting end and a welding end which are used as the longitudinal two ends of the first tab, the connecting end is connected with the first end face, and the welding end shields the through hole; the distance from the position of the connecting end of any first tab to the center of the through hole is the current radius r, and the length dimension L of any first tab meets the following conditions: l=r+a, a is more than or equal to 5mm and less than or equal to 7mm. Therefore, the welding ends of the first tabs and the pole columns are welded by utilizing the space of the through holes, the first tabs are not required to be welded to the current collecting disc, and then the pole columns are welded to the current collecting disc, so that one welding process is reduced.

Description

Electric core, battery monomer, battery and electric equipment

Technical Field

The application relates to the technical field of batteries, in particular to a battery core, a battery monomer, a battery and electric equipment.

Background

The cylindrical battery has the advantages of simple manufacture, high consistency, low cost and the like, and is widely applied to electric equipment such as electric tools, power automobiles and the like.

Conventionally, in a battery cell, a positive electrode tab and a negative electrode tab are respectively located at two ends of a battery cell, a positive current collecting disc is welded on the positive electrode tab, a negative current collecting disc is welded on the negative electrode tab, the positive current collecting disc is welded with a pole, and the negative current collecting disc is welded with a shell, so that the pole and the shell are respectively used as the positive electrode and the negative electrode of the battery cell. Therefore, the number of times of welding is required in the battery cell assembly process is large. Because the welding quality is poor in controllability, the yield of the battery monomer is greatly reduced; on the other hand, the total welding area is increased due to repeated welding, so that the internal resistance of the battery monomer is increased, the temperature rise of the battery monomer in overcurrent is greatly increased, and the long-term use stability of the battery monomer is reduced.

Disclosure of Invention

Based on the above, the number of times of welding is needed to be carried out in the process of assembling the battery monomer in the prior art, so that the yield of the battery monomer is greatly reduced; on the other hand, the total welding area is increased due to repeated welding, so that the internal resistance of the battery monomer is increased, the temperature rise of the battery monomer in overcurrent is greatly increased, the long-term use stability of the battery monomer is reduced, and the battery cell, the battery monomer, the battery and the electric equipment for improving the defects are provided.

The battery cell comprises a battery cell body and a plurality of first electrode lugs, wherein the battery cell body is provided with a first end face and a second end face which are opposite to each other, and the battery cell body is also provided with a through hole penetrating through the first end face and the second end face; each first tab is attached to the first end face and is provided with a connecting end and a welding end which are used as the two longitudinal ends of the first tab, the connecting end is connected with the first end face, and the welding end shields the through hole;

the distance from the position of the connecting end of any one of the first tabs to the center of the through hole is the current radius r, and the length dimension L of any one of the first tabs satisfies: l=r+a, a is more than or equal to 5mm and less than or equal to 7mm.

In one embodiment, a=6 mm.

In one embodiment, the battery cell body is formed by sequentially stacking a first pole piece material belt, a first diaphragm material belt, a second pole piece material belt and a second diaphragm material belt; the connecting ends of the first pole lugs are connected with one side edge of the first pole piece material belt in the width direction, and are distributed at intervals along the length direction of the first pole piece material belt.

In one embodiment, the length of each first tab is gradually increased from one end of the first tab strip located inside the battery cell body to one end located outside the battery cell body.

In one embodiment, from the inner side to the outer side of the battery cell body, each N circles of the first pole piece material belts are a group of pole piece circles;

the length dimension of each first tab on the first pole piece material belt of each group of pole piece rings is equal, and the difference DeltaL of the length dimension of each first tab on every two adjacent groups of pole piece rings satisfies the following conditions: Δl=n×t, where t is the sum of the thicknesses of one layer of the first pole piece strip, one layer of the first separator strip, one layer of the second pole piece strip, and one layer of the second separator strip.

In one embodiment, when t is less than or equal to 0.5mm, 5 < N is less than or equal to 10; or alternatively

When t is more than 0.5mm and less than or equal to 1mm, N is more than 3 and less than or equal to 5; or alternatively

When 1mm < t, N is less than or equal to 3.

A battery cell comprising a housing, a post, and a cell as described in any of the embodiments above; the electrode posts are arranged at one end of the shell in an insulating mode, the battery cells are contained in the shell, one end of each battery cell, which is provided with the first end face, faces the electrode posts, and the welding end of each first electrode lug is welded with each electrode post.

In one embodiment, the battery cell further includes a cover plate, the second end face of the battery cell body is provided with a plurality of second lugs, and the cover plate is connected to one end of the housing, which is far away from the pole, and is welded with each second lug on the second end face.

A battery comprising a battery cell as described in any one of the embodiments above.

A powered device comprising a battery as in any one of the embodiments above.

Above-mentioned electric core, battery monomer, battery and consumer, the length dimension of the first utmost point ear that is located the electric core body outside is greater than the length dimension of the first utmost point ear that is located the electric core body inboard, promptly through designing the length dimension L of each first utmost point ear, satisfies L=r+a, 5mm is less than or equal to a and is less than or equal to 7mm to ensure to buckle to the through hole and attach the welding end of each first utmost point ear on first terminal surface and be located the through hole department. The pole post insulated on the shell is contacted with the welding end of the first pole lug at the through hole, so that the welding end of each first pole lug and the pole post can be subjected to torque welding by utilizing the welding penetrated by the through hole. That is, the welding of the welding end of each first tab and the pole is realized by utilizing the space of the through hole, and the pole is welded on the current collecting disc after each first tab is not required to be welded on the current collecting disc, so that one welding procedure is reduced, the yield of the battery monomer is improved, one welding mark is reduced, the internal resistance of the battery monomer is reduced, the temperature rise of the battery monomer during overcurrent is reduced, and the long-term use stability of the battery monomer is improved.

Drawings

Fig. 1 is a cross-sectional view of a battery cell according to an embodiment of the present application;

FIG. 2 is a schematic view of the structure of the battery cell shown in FIG. 1 at a first end face;

FIG. 3 is an expanded schematic view of a first strip of pole pieces of the cells of the battery cell of FIG. 1;

FIG. 4 is an expanded view of a first strip of electrode tabs of a battery cell according to another embodiment of the present application;

fig. 5 is a schematic structural view of the battery cell shown in fig. 1 at the second end face;

fig. 6 is an expanded schematic view of a second strip of pole pieces of the battery cell of fig. 5.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

An embodiment of the present application provides an electrical device that uses a battery as its power source. The electric equipment can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like.

In particular embodiments, a battery includes a housing and a battery cell including one or more cells. The battery cell is accommodated in the case. The box body is used for providing an accommodating space for the battery monomer, can adopt various structures, and can also be in various shapes, such as a cylinder, a cuboid and the like.

In the battery, a plurality of battery monomers can be connected in series or in parallel or in series-parallel connection, and the series-parallel connection means that the plurality of battery monomers are connected in series or in parallel. The plurality of battery monomers can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery monomers is accommodated in the box body; of course, the battery can also be a battery module formed by connecting a plurality of battery cells in series or parallel or series-parallel connection, and then the plurality of battery modules are connected in series or parallel or series-parallel connection to form a whole and are accommodated in the box body. The battery may further include other structures, for example, a bus member for making electrical connection between the plurality of battery cells. Wherein each battery cell may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries.

Referring to fig. 1 to 3, an embodiment of the application provides a battery cell, which includes a housing 20, a battery cell 10 and a post 30. The battery cell 10 comprises a battery cell body 11 and a plurality of first electrode lugs 13. The cell body 11 has a first end face 111 and a second end face 112 opposite to each other. The cell body 11 further has a through hole 15 penetrating the first end face 111 and the second end face 112. Each first tab 13 is attached to the first end face 111, and has a connection end 131 and a welding end 132 as two longitudinal ends of the first tab 13. The connection end 131 is connected to the first end surface 111, and the welding end 132 shields the through hole 15. The distance from the position of the connecting end 131 of any first tab 13 to the center of the through hole 15 is the current radius r, and the length dimension L of any first tab 13 satisfies: l=r+a, a is more than or equal to 5mm and less than or equal to 7mm. Preferably, a=6 mm. The pole 30 is provided at one end of the housing 20 in an insulating manner. The battery cell 10 is accommodated in the housing 20, and one end with the first end face 111 faces the pole 30. The tab 30 is welded to the welding end 132 of each first tab 13.

In the above battery cell, the length dimension of the first tab 13 located at the outer side of the battery cell body 11 is greater than the length dimension of the first tab 13 located at the inner side of the battery cell body 11, that is, by designing the length dimension L of each first tab 13, l=r+a is satisfied, 5mm is less than or equal to a is less than or equal to 7mm, so as to ensure that the welding end 132 of each first tab 13 bent toward the through hole 15 and attached to the first end face 111 is located at the through hole 15. The pole pieces 30, which are insulation-mounted on the case 20, are in contact with the welding ends 132 of the first tabs 13 at the through holes 15, so that the welding ends 132 of the respective first tabs 13 can be torque-welded with the pole pieces 30 by welding passed through the through holes 15. That is, the welding of the welding end 132 of each first tab 13 and the electrode post 30 is realized by using the space of the through hole 15, and the electrode post 30 is welded to the current collecting plate after each first tab 13 is not required to be welded to the current collecting plate, so that one welding process is reduced, the yield of the battery monomer is improved, one welding mark is reduced, the internal resistance of the battery monomer is reduced, the temperature rise of the battery monomer during overcurrent is reduced, and the long-term use stability of the battery monomer is improved.

In the embodiment of the present application, the cell body 11 is formed of a first electrode sheet material tape 17 (see fig. 3 or 4), a first separator material tape, a second electrode sheet material tape 19, and a second separator material tape, which are stacked in this order. The connection end 131 of each first tab 13 is connected to one side edge of the first pole piece material belt 17 in the width direction, and is arranged at intervals along the length direction of the first pole piece material belt 17, so that each first tab 13 is located at the first end face 111 of the battery core body 11. After the flattening or flattening process, each first tab 13 is bent towards the through hole 15 and attached to the first end face 111, so that the welding end 132 of each first tab 13 is located at the through hole 15, so that the welding end 132 of each first tab 13 and the pole 30 are welded.

In some embodiments, as shown in fig. 3, from the end of the first electrode strip 17 located inside the battery core body 11 to the end located outside the battery core body 11, the length of each first tab 13 is gradually increased, so as to ensure that the welding end 132 of each first tab 13 can be located at the through hole 15 after the flattening or rubbing process, so as to facilitate welding with the pole 30.

In other embodiments, referring to fig. 4, from the inside to the outside of the battery cell body 11, each N number of the first pole piece strips 17 is a group of pole piece rings 171. The length dimensions of the first tabs 13 on the first pole piece material belt 17 of each group of pole piece rings 171 are equal, and the difference Δl between the length dimensions of the first tabs 13 on each two adjacent groups of pole piece rings 171 satisfies: Δl=n×t, where t is the sum of the thicknesses of one layer of first pole piece tape 17, one layer of first separator tape, one layer of second pole piece tape 19, and one layer of second separator tape. In this way, by dividing each turn of the first pole piece material belt 17 of the cell body 11 into a group of pole piece rings 171 every N turns, and designing the length dimension of the first pole tab 13 on the first pole piece material belt 17 of each group of pole piece rings 171 (i.e. satisfying Δl=n×t), on one hand, it is ensured that the welding end 132 of each first pole tab 13 can be located at the through hole 15 after the flattening or flattening process, on the other hand, it is ensured that the length of the welding end 132 located at the through hole 15 is moderate, and penetration into the cell body 11 (i.e. between the layers of material belts) due to the overlong length of the welding end 132 located at the through hole 15 is avoided.

Alternatively, t.ltoreq.0.5 mm, then 5 < N.ltoreq.10, thereby ensuring that penetration into the cell body 11 due to excessive solder ends 132 at the through holes 15 does not occur.

Alternatively, 0.5mm < t.ltoreq.1 mm, 3 < N.ltoreq.5, thereby ensuring that penetration into the cell body 11 due to excessive lengths of the soldering terminal 132 at the through hole 15 does not occur.

Alternatively, 1mm < t, N.ltoreq.3, thereby ensuring that penetration into the cell body 11 due to excessive lengths of the solder terminals 132 at the through holes 15 does not occur.

In particular, in the embodiment, the first tab 13 may be trapezoidal. Of course, in other embodiments, the first tab 13 may also be triangular, rectangular, etc., which is not limited herein.

In the embodiment of the application, the battery cell 10 further includes a plurality of second tabs 14, one end of each second tab 14 is connected to the second end face 112, and is bent towards the through hole 15 to be attached to the second end face 112, and the other end of each second tab 14 does not cover the through hole 15. In this way, since each second tab 14 does not cover the through hole 15, it is ensured that the welding pin can pass through the through hole 15 and reach the welding end 132 of each first tab 13, so as to weld the welding end 132 of each first tab 13 and the pole 30. Further, the battery cell further includes a cover 40 (see fig. 1), and the cover 40 is connected to an end of the housing 20 away from the post 30, such that the second end 112 of the battery cell body 11 faces the cover 40. The cover plate 40 is welded to each of the second lugs 14 on the second end face 112.

It should be noted that, each second lug 14 on the second end face 112 is directly welded on the cover plate 40, so as to realize electrical connection with the cover plate 40 and the housing 20, and it is unnecessary to weld each second lug 14 on the current collecting disc and then weld the current collecting disc with the bottom cover, so that a welding procedure is reduced, which is beneficial to improving the yield of the battery cell, and meanwhile, one welding mark is reduced, the internal resistance of the battery cell is reduced, the temperature rise of the battery cell during overcurrent is reduced, and the long-term use stability of the battery cell is increased.

In the embodiment, each of the second tabs 14 is connected to one side edge in the width direction of the second sheet material belt 19, and is arranged at intervals along the length direction of the second sheet material belt 19. Thus, when the first electrode sheet material tape 17, the first separator material tape, the second electrode sheet material tape 19 and the second separator material tape, which are sequentially stacked, are wound into the battery cell 10, each first tab 13 is located on the first end face 111 of the battery cell body 11, and each second tab 14 is located on the second end face 112 of the battery cell body 11. After the flattening or flattening process, each first tab 13 is bent toward the through hole 15 and attached to the first end face 111, and each second tab 14 is bent toward the through hole 15 and attached to the second end face 112.

Further, the cover 40 is provided with a liquid injection hole (not shown) facing the through-hole 15 of the cell body 11, and electrolyte can be injected into the case 20 through the liquid injection hole. The liquid injection hole can be sealed by a sealing nail. In this way, when welding the welding end 132 of each first tab 13 and the electrode post 30, the welding needle sequentially passes through the liquid injection hole on the cover plate 40 and the through hole 15 of the battery cell body 11 until reaching the welding end 132 of each first tab 13; then, the welding ends 132 of the respective first tabs 13 are torque-welded to the pole pieces 30 by welding.

In one embodiment, the first electrode tab material strip 17 is a positive electrode tab, and the first tab 13 is a positive electrode tab, and the post 30 is used as a positive electrode of the battery cell. The second tab strip 19 is a negative tab, and the second tab 14 is a negative tab, and the cover 40 or the case 20 is a negative electrode of the battery cell.

Of course, in another embodiment, the first electrode tab material strip 17 may be a negative electrode tab, and the first tab 13 is a negative electrode tab, and the post 30 is a negative electrode of the battery cell. The second tab strip 19 is a positive tab, and the second tab 14 is a positive tab, and the cover 40 or the case 20 is a positive electrode of the battery cell.

It should be noted that, the length dimensions of the second lugs 14 may be designed to be equal, which is beneficial to reducing the processing difficulty of the second lugs 14 and improving the processing efficiency of the second lugs 14. Alternatively, the second tab 14 may be trapezoidal, triangular, rectangular, etc., and is not limited herein.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. The battery cell is characterized by comprising a battery cell body (11) and a plurality of first electrode lugs (13), wherein the battery cell body (11) is provided with a first end face (111) and a second end face (112) which are opposite to each other, and the battery cell body (11) is also provided with a through hole (15) penetrating through the first end face (111) and the second end face (112); each first tab (13) is attached to the first end face (111) and is provided with a connecting end (131) and a welding end (132) which are used as the two longitudinal ends of the first tab (13), the connecting end (131) is connected with the first end face (111), and the welding end (132) shields the through hole (15);

the distance from the position of the connecting end (131) of any one of the first tabs (13) to the center of the through hole (15) is the current radius r, and the length dimension L of any one of the first tabs (13) satisfies: l=r+a, a is more than or equal to 5mm and less than or equal to 7mm.

2. The cell of claim 1, wherein a = 6mm.

3. The cell of claim 1, wherein the cell body (11) is formed by sequentially stacking a first sheet material strip (17), a first separator material strip, a second sheet material strip (19), and a second separator material strip; the connecting ends (131) of the first pole lugs (13) are connected with the first pole piece material belts (17) and are distributed at intervals along the length direction of the first pole piece material belts (17).

4. A cell according to claim 3, wherein the length of each first tab (13) increases gradually from an end of the first strip of pole pieces (17) located inside the cell body (11) to an end located outside the cell body (11).

5. A cell according to claim 3, characterized in that from inside to outside the cell body (11), each N turns of the first pole piece strip (17) is a set of pole piece turns (171);

the length dimension of each first tab (13) on the first pole piece material belt (17) of each group of pole piece rings (171) is equal, and the difference DeltaL of the length dimension of each first tab (13) on every two adjacent groups of pole piece rings (171) satisfies: Δl=n×t, where t is the sum of the thicknesses of one layer of the first pole piece tape (17), one layer of the first separator tape, one layer of the second pole piece tape (19), and one layer of the second separator tape.

6. The cell of claim 5, wherein 5 < N is less than or equal to 10 when t is less than or equal to 0.5 mm; or,

when t is more than 0.5mm and less than or equal to 1mm, N is more than 3 and less than or equal to 5; or,

when 1mm < t, N is less than or equal to 3.

7. A battery cell characterized by comprising a housing (20), a pole (30) and a cell (10) according to any of claims 1 to 6; the pole (30) is arranged on the shell (20) in an insulating mode, the battery cell (10) is contained in the shell (20), one end of the battery cell (10) with the first end face (111) faces the pole (30), and the welding end (132) of each first pole lug (13) is welded with the pole (30).

8. The battery cell of claim 7, further comprising a cover plate (40), wherein the second end face (112) of the cell body (11) has a plurality of second tabs (14), and wherein the cover plate (40) is connected to an end of the housing (20) remote from the post (30) and is welded to each of the second tabs (14) on the second end face (112).

9. A battery comprising the battery cell of claim 7 or 8.

10. A powered device comprising the battery of claim 9.