CN216529013U

CN216529013U - Roll up integrative coiling battery of welding

Info

Publication number: CN216529013U
Application number: CN202122777446.3U
Authority: CN
Inventors: 闫天昊; 石小利
Original assignee: Yunshan New Energy Material Technology Shenzhen Co ltd
Current assignee: Yunshan Power Ningbo Co ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-05-13
Anticipated expiration: 2031-11-12

Abstract

The application relates to the field of batteries and discloses a winding battery integrating coil welding, which comprises an electric core and a shell, wherein the electric core is formed by overlapping a pole piece and a diaphragm and then winding around a reel of the electric core; after the pole piece is wound, a plurality of pole lugs form a plurality of circles of pole lug rings arranged at intervals inside and outside; in the winding process of the pole piece, the two adjacent pole ear rings form a pole ear group in a welding mode after pressing, and the pole ear group is connected with the shell in a welding mode. Provided is a roll-welded integrated roll-up battery which can effectively remove metal chips while welding while winding.

Description

Roll up integrative coiling battery of welding

Technical Field

The application relates to the field of batteries, in particular to a winding battery integrating roll welding.

Background

With the development of electronic technology, lithium ion batteries have the advantages of high specific power, long cycle life, good safety performance, no pollution and the like, so that the lithium ion batteries are widely applied. The conventional wound battery is mainly a single-pole or multi-pole wound battery, and the wound battery is more and more approved due to low internal resistance and high energy density.

The first method is to rub the whole pole ear flatly, the pole ear and the pole ear are lapped together through rubbing flatly, and then the rubbed pole ear is welded with a confluence sheet to form the connection between the pole ear and the pole ear as well as between the pole ear and a connecting piece; the second is to bend and flatten the intermittent multi-pole ear, and form the lap joint between the flattened pole ear and the pole ear, then weld the flattened pole ear and the confluence sheet, and form the connection between the pole ear and the connecting piece.

The main shortcoming of the first mode is that the tab belongs to a metal material, metal scraps generated by back-and-forth pressing and friction under external force enter the battery, and cannot be removed, so that the battery is easy to self-discharge to cause potential safety hazards, a certain gap exists between tab layers, uneven gaps exist in the pressed surface, welding connection is unstable, and the phenomenon of uneven current density or insufficient welding is caused

The second kind of mode utmost point ear is more, need buckle utmost point ear one by one, it is thinner because of utmost point ear material, the free end of utmost point ear is buckled easily inside the pole piece when buckling or atress are uneven, cause the battery short circuit, this kind of while is buckled and is buckled the number difference because of rolling up the inside and outside utmost point ear of core, can't form better plane, the inner space is inhomogeneous, need lean on the bus bar to weld and push down and stress adjustment, it is bad to easily produce the welding, this kind of mode still exists and buckles probably to have the condition that the welding is not gone up when the utmost point ear welds, lead to the appearance of effective utmost point ear quantity not enough and overlap joint point discharge situation.

SUMMERY OF THE UTILITY MODEL

The utility model provides a there is certain clearance, can't form better plane and inner space inhomogeneous between the utmost point ear layer after the utmost point ear that prior art exists forms the plane through rubbing flat or the mode that flattens mainly to this application, leads to appearing self-discharge, current density inhomogeneous and the effective utmost point ear technical problem that quantity is not enough, provides an edge-to-edge welding of coiling, the integrative coiling battery of the volume welding that can effectual get rid of the metal fillings.

In order to solve the technical problems and achieve the purpose of the application, the application provides a winding battery integrating roll welding, which is characterized by comprising an electric core and a shell, wherein the electric core is formed by overlapping a pole piece and a diaphragm and then winding the electrode around a reel of the electric core, the pole piece comprises a coating area and an empty foil area, and the empty foil area is longitudinally removed at intervals to form a plurality of lugs arranged at intervals; after the pole piece is wound, a plurality of pole lugs form a plurality of circles of pole lug rings arranged at intervals inside and outside; in the winding process of the pole piece, the two adjacent pole ear rings form a pole ear group in a welding mode after pressing, and the pole ear group is connected with the shell in a welding mode.

In an implementation mode, utmost point ear crowd include outer utmost point ear crowd and inlayer utmost point ear crowd, utmost point ear circle is including being close to the inlayer utmost point ear circle that the electricity core spool set up and being close to the outer utmost point ear circle that the casing set up, adjacent two outer utmost point ear circle welded connection forms outer utmost point ear crowd, adjacent two inlayer utmost point ear circle welded connection forms inlayer utmost point ear crowd, outer utmost point ear crowd directly with the casing links to each other, inlayer utmost point ear crowd through the piece that flows converging with the casing links to each other.

In an embodiment, the pole piece includes an initial end and a terminal end, which are arranged in a front-back manner, and after the pole piece is wound, the initial end is inside and the terminal end is outside; the tabs are arranged at intervals from the initial end to the terminal end to form a full tab structure.

In an embodiment, the pole pieces are arranged in an equal distance between two adjacent tabs in the unfolded state.

In an embodiment, the pole pieces are arranged in a spread state, and two adjacent pole lugs are arranged in a variable distance.

In an embodiment, in the unfolded state of the pole pieces, the distance between two adjacent tabs is gradually increased from the initial end to the terminal end; the pole piece is in the coiling state, the utmost point ear circle comprises a plurality of rows of radial utmost point ear row that sets up.

In one embodiment, the empty foil regions are removed in a straight cut manner and/or a beveled cut manner.

In an implementation mode, the pole piece includes a positive pole piece and a negative pole piece, and the battery cell is formed by stacking and winding the diaphragm, the positive pole piece, the diaphragm and the negative pole piece in sequence.

In one embodiment, the empty foil region is arranged on the side of the coating region.

In one embodiment, the empty foil zone is formed by a reserved portion and a cut portion, the tab is formed by longitudinally removing the cut portion, and the cut portion is connected to the coating zone through the reserved portion.

Compared with the prior art, the integrative coiling battery of this application roll-welding has following beneficial effect:

1. the polar lug rings are tightly pressed, so that the welding reliability between the polar lug rings can be effectively ensured;

2. a full-lug spacing structure is adopted to ensure that the stress is well released in the pressing process;

3. the full-lug is welded completely, so that the welding area is ensured, and the consistency between the actual overcurrent capacity and the design capacity is effectively ensured;

4. a non-kneading and flattening process is adopted, so that metal chips caused by kneading and flattening are avoided, the generation of self-discharge is reduced, and potential safety hazards are eliminated;

5. the tab is not bent, so that the situation that the tab is broken after poor bending is reduced;

6. the metal chips can be removed more effectively by welding while winding.

Therefore, the device has the characteristics of reasonable structure and high reliability.

Drawings

Fig. 1 is a schematic structural view of a multi-tab wound battery of the present application;

FIG. 2 is a schematic structural diagram of the present application in an unfolded state of pole pieces when two adjacent tabs are subjected to variable distance;

FIG. 3 is a schematic structural diagram of a pole ear ring for changing the distance between two adjacent pole ears according to the present application;

FIG. 4 is a schematic structural diagram of the present application in an unfolded state of the pole pieces with two adjacent tabs at equal distances;

fig. 5 is a schematic structural diagram of the pole ear ring when two pole ears are connected at equal intervals.

The reference numbers in the figures illustrate: 1. an electric core; 2. a housing; 3. a coating zone; 4. a polar ear loop; 5. an outer layer tab group; 6. an inner layer tab group; 7. a confluence sheet; 8. an initial end; 9. a terminating end; 10. arranging tabs; 11. a reserved portion; 12. a cutting section; 13. and (6) arranging gaps.

Detailed Description

In order to make the objects, features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the prior art, after the plane is formed by kneading or flattening the tabs, a certain gap exists between the tab layers, a better plane cannot be formed, and the internal space is not uniform, so that the technical problems of self-discharge, non-uniform current density and insufficient number of effective tabs are caused.

Therefore, the winding battery integrating roll welding is provided, and comprises an electric core 1 and a shell 2, wherein the electric core 1 is formed by overlapping a pole piece and a diaphragm and then winding the overlapped pole piece and the diaphragm around a reel of the electric core, the pole piece comprises a coating area 3 and an empty foil area, and a plurality of lugs arranged at intervals are formed after the empty foil area is longitudinally removed at intervals; after the pole piece is wound, a plurality of pole lugs form a plurality of pole lug rings 4 which are arranged at intervals inside and outside; in the winding process of the pole piece, the two-phase pole ear rings 4 form pole ear groups in a welding mode after being pressed, and the pole ear groups are connected with the shell 2 in a welding mode.

Example 1:

fig. 1 to 3 show an embodiment of a roll-welded one-piece wound battery according to the present application.

Referring to fig. 1 and fig. 2, in an embodiment of the present application, a winding battery with integrated coil welding is shown, including a battery core 1 and a casing 2, the battery core 1 is disposed in the casing 2, the casing 2 is used as a conductive terminal and connected to the battery core 1, and the battery core 1 is formed by stacking pole pieces and diaphragms and winding them. The pole piece comprises a positive plate and a negative plate, the stacking mode between the pole piece and the diaphragm is a diaphragm, the positive plate, the diaphragm and the negative plate, and the battery cell 1 is formed by winding around a battery cell reel after stacking.

The pole piece comprises a coating area 3 and a hollow foil area, wherein the coating area 3 is covered with an active material, the hollow foil area is not covered with the active material, and the coating area 3 and the hollow foil area are connected to form a clear boundary. The pole pieces in the unfolded state are of a rectangular structure and comprise a longitudinal direction and a transverse direction, and the empty foil area is longitudinally arranged on the coating area 3. The processing method of the tab is to remove the tab according to the arrangement method of the empty foil area. And during specific rejection, special rejection equipment is used for rejection, the rejected area is a rejection gap, and the rejection gap is arranged at intervals after rejection, so that the interval arrangement of the lugs is further formed.

After the pole piece is wound, a plurality of pole lugs form a plurality of circles of pole lug rings 4 arranged at intervals inside and outside, and the diameter of each pole lug ring 4 which is more outward by taking the battery core reel as the center is larger. After the pole piece is coiled, the pole ear ring 4 is sequentially connected end to end from inside to outside to form a spiral pole ear ring, the spiral pole ear ring gradually expands outwards by taking the electric core reel as the center, the connecting line of the spiral pole ear ring from head to tail is a spiral line, and the spiral line is specifically a spiral mosquito-repellent incense coil structure.

The pole piece constantly forms utmost point ear circle 4 at the in-process of coiling, after the utmost point ear circle 4 in the in-process of coiling forms the utmost point ear circle 4 in the outside, just promote adjacent inboard utmost point ear circle 4 at once and be close to the utmost point ear circle 4 in the outside, thereby realize the welded connection of two adjacent utmost point ear circles 4 through the side-winding welded mode, utmost point ear circle 4 forms utmost point ear crowd through the welded mode after the pressfitting in the continuous in-process of coiling of pole piece, utmost point ear circle 4 leads to the welded mode and links to each other with casing 2, utmost point ear crowd forms connecting portion and collection portion after the pressfitting, connecting portion slant links to each other with collection portion, collection portion is whole very level and smooth because of the pressfitting effect, utmost point ear crowd links to each other with casing 2 through the welded mode, the concrete welding position of utmost point ear crowd is collection portion, collection portion is vertical mutually with casing 2 after the welding.

The size of the empty foil area is changed rapidly after the empty foil area is removed longitudinally at intervals, the phenomenon that the stress is increased remarkably occurs locally, and the early failure of the pole piece is often caused at the position where the stress is concentrated. And the empty foil area forms the full utmost point ear structure after vertical interval is rejected, and the full utmost point ear structure can guarantee that utmost point ear from the in-process stress of outside pressfitting of center obtains fine release, avoids the phenomenon that utmost point ear appears breaking. And in the process that the lugs are expanded outwards, the adjacent lugs inside and outside are tightly pressed, so that the welding between the lugs can be effectively ensured.

The lugs are welded after being pressed to form a lug group and then are comprehensively welded with the shell 2, so that the welding area is ensured, and meanwhile, the consistency between the actual overcurrent capacity and the design capacity is effectively ensured.

The lug group is formed by welding after being pressed, a non-kneading process is adopted, metal scraps caused by kneading and flattening are avoided, self-discharge is reduced, potential safety hazards are eliminated, and particularly, the lug group can be manufactured in a mode of coiling and edge-curling welding, and the metal scraps can be effectively removed.

The electrode lugs are only pressed from inside to outside to a certain degree, so that the electrode lugs are obliquely arranged to a certain degree, the electrode lugs are not directly bent to a large extent, and adverse reaction after bending and the degree of freedom of participation of the electrode lugs on the inner layer in welding are reduced.

In the embodiment of this application, utmost point ear crowd can fall into outer utmost point ear crowd 5 and inlayer utmost point ear crowd 6 through setting up the difference in position, utmost point ear circle 4 can fall into inlayer utmost point ear circle and outer utmost point ear circle through setting up the difference in position, inlayer utmost point ear circle is close to the setting of electricity core spool, outer utmost point ear circle is close to casing 2 setting, welded connection forms outer utmost point ear circle after two adjacent outer utmost point ear circles pressfitting, welded connection forms inlayer utmost point ear circle after two adjacent inlayer utmost point ear circles pressfitting, outer utmost point ear circle is direct to link to each other with casing 2, inlayer utmost point ear circle links to each other with casing 2 through converging piece 7.

Divide into inlayer utmost point ear circle and outer utmost point ear circle with utmost point ear crowd, then separate the welding with casing 2 with inlayer utmost point ear circle and outer utmost point ear circle for whole welding effect is better, and the subsequent handling can save partly and let the electrified welded operation of casing 2.

In the specific embodiment of the present application, the pole piece includes an initial end 8 and a terminal end 9, which are correspondingly arranged in front and at the back, the tab is a strip-shaped mechanism in the unfolded state, the tab is a rectangular structure in the optimized state, and the initial end 8 and the terminal end 9 are defined according to the specific winding direction. During specific coiling, coil by initial end 8 to termination end 9, we including the parcel behind the pole piece coiling think as initial end 8, outside we just think termination end 9, the utmost point ear sets up by initial end 8 to termination end 9 interval and forms full utmost point ear structure, only can use full utmost point ear mechanism under the condition that utmost point ear circle 4 falls into inner layer utmost point ear circle and outer utmost point ear circle, otherwise when the utmost point ear too much adopts limit coiling limit welded mode, the connection between utmost point ear and casing 2 can be insufficient. Of course, a tab-free mode can also be adopted, in the tab-free mode, the tab of the pole piece near the initial end 8 is cut off to form a tab-free structure, wherein the length of the tab-containing mode is longer than that of the tab-free mode.

Referring to fig. 3, in the embodiment of the present application, the pole pieces are arranged in a variable distance between two adjacent tabs in the unfolded state. The pole piece is under the expansion state, and the interval between two adjacent utmost point ears is by initial end 8 to termination end 9 crescent setting, forms the utmost point ear circle 4 that the overcoat was established in a plurality of circles after the pole piece is convoluteed, if the quantity of every circle utmost point ear all is unanimous, then along with the increase of the diameter of utmost point ear circle 4, interval between adjacent utmost point ear also can corresponding increase. Therefore, only if the distance between two adjacent tabs is gradually increased from the initial end 8 to the terminal end 9, the tab ring 4 is formed by a plurality of radial tab rows 10 after winding, and the tab rows 10 are arranged to more conveniently press the tabs tightly. Adjacent rows of tabs 10 have row gaps 13 therebetween to facilitate electrolyte flow between the row gaps 13.

In the specific embodiment of the application, the elimination mode of the empty foil area is a straight cutting mode and/or a slant cutting mode, a right-angled tab is formed through the straight cutting mode, and a trapezoid tab is formed through the slant cutting mode.

In a particular embodiment of the present application, the empty foil zone is arranged on one side of the coating zone 3.

In the embodiment of the present application, the empty foil region includes a reserved portion 11 and a cut portion 12, the tab is formed by longitudinally and alternately removing the cut portion 12, and the cut portion 12 is connected to the coating region 3 through the reserved portion 11.

Example 2:

fig. 1, 4 and 5 illustrate one embodiment of the multi-tab wound battery of the present application.

Referring to fig. 1 and 4, in an embodiment of the present application, a winding battery with integrated coil welding is shown, including a battery core 1 and a casing 2, the battery core 1 is disposed in the casing 2, the casing 2 is used as a conductive terminal to connect with the battery core 1, and the battery core 1 is formed by stacking pole pieces and diaphragms and winding them. The pole piece comprises a positive plate and a negative plate, the stacking mode between the pole piece and the diaphragm is a diaphragm, the positive plate, the diaphragm and the negative plate, and the battery cell 1 is formed by winding around a battery cell reel after stacking.

The pole piece constantly forms utmost point ear circle 4 at the in-process of coiling, after the utmost point ear circle 4 in the in-process of coiling forms the utmost point ear circle 4 in the outside, just promote adjacent inboard utmost point ear circle 4 at once and be close to the utmost point ear circle 4 in the outside, thereby realize the welded connection of two-phase utmost point ear circle 4 that links to each other through the welded mode of coiling while twining, utmost point ear circle 4 forms utmost point ear crowd through the welded mode after the pressfitting in the continuous in-process of coiling of pole piece, utmost point ear circle 4 links to each other with casing 2 through the welded mode, utmost point ear crowd forms connecting portion and collection portion after the pressfitting, connecting portion slant links to each other with collection portion, collection portion is whole very level and smooth because of the pressfitting effect, utmost point ear crowd links to each other with casing 2 through the welded mode, the concrete welding position of utmost point ear crowd is collection portion, collection portion is vertical mutually with casing 2 after the welding.

Referring to fig. 5, in the unfolded state, the pole pieces are disposed at equal intervals between two adjacent tabs.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means 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 the application. 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.

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

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A winding battery integrating coil welding is characterized by comprising an electric core (1) and a shell (2), wherein the electric core (1) is formed by overlapping a pole piece and a diaphragm and then winding the superposed pole piece and the diaphragm around an electric core reel, the pole piece comprises a coating area (3) and an empty foil area, and the empty foil area is longitudinally removed at intervals to form a plurality of lugs arranged at intervals; after the pole piece is wound, a plurality of pole lugs form a plurality of circles of pole lug rings (4) which are arranged at intervals inside and outside; in the winding process of the pole piece, the two adjacent pole ear rings (4) form a pole ear group in a welding mode after lamination, and the pole ear group is connected with the shell (2) in a welding mode.

2. The roll-welded integrated winding battery according to claim 1, wherein the tab groups comprise an outer tab group (5) and an inner tab group (6), the tab rings (4) comprise an inner tab ring arranged close to the battery core reel and an outer tab ring arranged close to the casing (2), two adjacent outer tab rings are welded together after being pressed together to form the outer tab group (5), two adjacent inner tab rings are welded together after being pressed together to form the inner tab group (6), the outer tab group (5) is directly connected with the casing (2), and the inner tab group (6) is connected with the casing (2) through a current collecting sheet (7).

3. The roll-welded one-piece wound battery according to claim 2, characterized in that the pole piece comprises an initial end (8) and a terminal end (9) which are arranged in a front-back manner, wherein after the pole piece is wound, the initial end (8) is arranged in the inner side, and the terminal end (9) is arranged in the outer side; the tabs are arranged at intervals from the initial end (8) to the terminal end (9) to form a full tab structure.

4. The roll welded unitary wound battery of claim 3, wherein the pole pieces are positioned equidistantly between two adjacent tabs in the unwound state.

5. The roll welded unitary wound battery of claim 3, wherein the pole pieces are spaced adjacent the tabs in an unfolded condition.

6. The roll-welded one-piece wound battery according to claim 5, wherein the pole pieces are arranged such that the spacing between two adjacent tabs increases from the initial end (8) to the terminal end (9) in the unfolded state; the pole piece is in the coiling state, utmost point ear circle (4) are arranged the utmost point ear row (10) of radially setting by a plurality of rows and are constituteed.

7. The roll-welded integrated wound battery according to claim 1, wherein the empty foil regions are removed in a straight cut manner and/or a chamfered cut manner.

8. The roll-welding integrated winding battery according to claim 1, wherein the pole pieces comprise a positive pole piece and a negative pole piece, and the battery core (1) is formed by winding the diaphragm, the positive pole piece, the diaphragm and the negative pole piece after being stacked in sequence.

9. A roll-welded unitary wound battery according to claim 1, characterized in that the empty foil zone is provided on the side of the coating zone (3).

10. A roll-welded one-piece wound battery according to claim 9, characterized in that the empty foil zone is formed by a reserve portion (11) and a cut portion (12), the tabs being formed by longitudinal thinning out of the cut portion (12), the cut portion (12) being connected to the coating zone (3) via the reserve portion (11).