CN220021527U - Battery and charging and discharging equipment - Google Patents

Abstract

The utility model relates to a battery and charge-discharge equipment, wherein the battery comprises a top cover component, a winding core connected with the top cover component and at least one auxiliary soldering lug, the top cover component comprises at least one electrode pin, the winding core comprises at least one tab, wherein: the electrode lug comprises a stress part and a non-stress part connected with the stress part, and the auxiliary welding lug comprises a bending part and a non-bending part connected with the bending part; the non-bending part is used for being attached to the stress part of the corresponding tab after welding, and the bending part is used for being attached to the non-stress part of the corresponding tab after welding. By bending the auxiliary welding lug of the winding core, the auxiliary welding lug can be adaptively attached to the lug, the joint of the auxiliary welding lug of the planar structure and the lug point at the inclined plane after pre-welding is avoided, the phenomenon of lug rupture caused by overlarge lug stress is improved, and the stability and the safety of the battery are improved.

Description

Battery and charging and discharging equipment

Technical Field

The utility model relates to the technical field of charge and discharge, in particular to a battery and charge and discharge equipment.

Background

At present, in the connection design of the top cover assembly and the winding core of the square lithium battery, the positive and negative electrode pins of the top cover assembly are welded with the positive and negative electrode lugs of the winding core respectively by ultrasonic welding. Because the single-layer tab of the winding core is thinner, usually 5-20um, the tab cannot withstand the higher energy of ultrasonic welding, and therefore, a rectangular sheet auxiliary soldering lug is generally adopted in the battery industry to protect the tab during welding.

In addition, the tab adhesive tape is attached to the tab after ultrasonic welding. The tab adhesive tape can wrap welding spots of ultrasonic welding to prevent the welding spots from puncturing the diaphragm to cause short circuit of the winding core, and can also prevent the welding spots from being corroded by electrolyte to cause tab falling and increase of internal resistance of the battery. Meanwhile, burrs are easy to occur when the tab with the die-cutting structure is cut, and if the tab adhesive tape is not adhered, the burrs are easy to pierce the diaphragm to cause short circuit. The amplitude given by ultrasonic waves during ultrasonic welding can lead the pole piece close to the pole lug to have the phenomenon of powder falling, and the short circuit rate can be greatly reduced after the pole lug adhesive tape is wrapped and fixed. Therefore, the industry generally uses the tab adhesive tape to attach the tab to perform insulation and fixation functions.

However, in the related art, on one hand, the auxiliary welding tab is of a regular rectangular sheet structure, so that the tab presents an inclined plane after pre-welding, the auxiliary welding tab of the sheet structure intersects with the inclined plane of the tab at a point, and the tab is broken during welding; on the other hand, at present, the ultrasonic welding of tab and the adhesive tape of sticking tab are two processes, and especially the adhesive tape of sticking tab is mostly manual work, and the process actions such as manual tearing, alignment, rubberizing, ending are too loaded down with trivial details, consume a large amount of manpower and time, lead to the packaging efficiency of whole battery not high, have influenced the production efficiency of battery.

Therefore, there is a need for improvement in the assembly details of the battery to improve the ease of breakage of the tab at the time of ultrasonic welding, while improving the production efficiency of the battery.

Disclosure of Invention

In view of this, the utility model provides a battery and a charging and discharging device, which can enable an auxiliary soldering lug to be adaptively attached to a corresponding tab, avoid the connection between the auxiliary soldering lug with a planar structure and a tab point at an inclined plane after pre-welding, improve the phenomenon of tab breakage caused by overlarge tab stress, and improve the stability and safety of the battery.

In a first aspect, an embodiment of the present utility model provides a battery, the battery including a top cap assembly, a winding core connected to the top cap assembly, and at least one auxiliary tab, the top cap assembly including at least one electrode pin, the winding core including at least one tab, each tab being welded to the electrode pin corresponding to the tab by the auxiliary tab corresponding to the tab, wherein: the electrode lug comprises a stress part and a non-stress part connected with the stress part, and the auxiliary welding lug comprises a bending part and a non-bending part connected with the bending part; the non-bending part is used for being attached to the corresponding stress part of the tab after welding, and the bending part is used for being attached to the corresponding non-stress part of the tab after welding.

In an embodiment, the bending portion includes a first sub-bending portion, a second sub-bending portion, and a third sub-bending portion, wherein: the first sub-bending part, the second sub-bending part and the third sub-bending part are intersected with the non-bending part.

In an embodiment, the second sub-bending portion is connected to the first sub-bending portion and the third sub-bending portion, and the first sub-bending portion and the third sub-bending portion are symmetrically arranged.

In an embodiment, at least one of the first sub-bending portion, the second sub-bending portion and the third sub-bending portion is an inclined surface.

In an embodiment, at least one of the first sub-bending portion, the second sub-bending portion and the third sub-bending portion is a cambered surface.

In an embodiment, the non-bending portion is provided with at least one hole, and each hole is arranged in a row and column mode.

In one embodiment, each of the holes includes a first sub-hole in communication with a second sub-hole having a diameter greater than the diameter of the first sub-hole.

In an embodiment, the battery further comprises at least one tape comprising a head portion, a middle portion, and a tail portion, wherein: the head of one adhesive tape is provided with at least one cylindrical bulge, and the diameter of each cylindrical bulge is smaller than that of the first sub-hole.

In an embodiment, the cylindrical protrusion is disposed corresponding to one hole of the non-bending portion, and passes through the hole to form a mushroom head structure, and the mushroom head structure is used for locking the adhesive tape with the non-bending portion.

In a second aspect, an embodiment of the present utility model provides a charge and discharge apparatus including the battery.

The auxiliary welding tab of the winding core is bent to form a bending part and a non-bending part connected with the bending part, the non-bending part of the auxiliary welding tab is attached to the stressed part of the lug corresponding to the auxiliary welding tab, the bending part of the auxiliary welding tab is attached to the non-stressed part of the lug corresponding to the auxiliary welding tab, the auxiliary welding tab and the corresponding lug can be attached in an adaptive manner according to the aspects of the utility model, the connection of the auxiliary welding tab with lug points at the inclined plane after pre-welding of the auxiliary welding tab with the planar structure is avoided, the phenomenon of lug breakage caused by overlarge stress of the lug is improved, and the stability and the safety of the battery are improved.

Drawings

The technical solution and other advantageous effects of the present utility model will be made apparent by the following detailed description of the specific embodiments of the present utility model with reference to the accompanying drawings.

Fig. 1 shows a schematic structure of a battery in the related art.

Fig. 2 is a schematic view showing a lug inclined plane formed by ultrasonic welding in the related art.

Fig. 3 is a schematic perspective view of an auxiliary tab according to an embodiment of the present utility model.

Fig. 4 shows a schematic plan view of an auxiliary tab according to an embodiment of the present utility model.

Fig. 5 shows a schematic perspective view of an adhesive tape according to an embodiment of the present utility model.

Fig. 6 shows a schematic plan view of an adhesive tape according to an embodiment of the present utility model.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, 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", 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 utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. 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 one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements or interaction relationship between the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The following disclosure provides many different embodiments, or examples, for implementing different features of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials. In some instances, well known methods, procedures, components, and circuits have not been described in detail so as not to obscure the present utility model.

Fig. 1 shows a schematic view of a related art battery structure.

As shown in fig. 1, in the related art, a battery may include a top cap assembly 1 and a jelly roll 2. The top cap subassembly 1 is equipped with anodal pin 11 and negative pole pin 12 respectively at both ends, and the both ends of rolling up core 2 are equipped with anodal utmost point ear 21 and negative pole utmost point ear 22 respectively. The positive electrode tab 21 is welded to the positive electrode lead 11 through the auxiliary tab 31, and the negative electrode tab 22 is welded to the negative electrode lead 12 through the auxiliary tab 32. The auxiliary tab 31 and the auxiliary tab 32 are each rectangular sheet-like structures. The adhesive tape 41 may be elongated and wrap the welding spots corresponding to the auxiliary tab 31; the tape 42 may also be elongated and wrap around the welds corresponding to the auxiliary tabs 32.

Taking the positive electrode tab 21 as an example, during ultrasonic welding, the positive electrode tab 21 may be compacted by pre-welding, and then the positive electrode tab 21 is subjected to protective welding by using the auxiliary welding tab 31, so that the positive electrode tab 21 and the positive electrode pin 11 can be firmly connected. In the process of pre-welding the positive electrode tab 21, the positive electrode tab 21 is pressed down due to the action force from the welding equipment, so that the junction between the stressed part and the non-stressed part of the positive electrode tab 21 generates a certain inclination, and then an inclined plane is formed at the non-stressed part. In general, since the pre-welding position is located at the side of the middle of the positive electrode tab 21 away from the winding core 2, three inclined planes may be formed, which correspond to the upper and lower sides of the pre-welding mark and the side of the positive electrode tab 21 near the winding core 2.

Fig. 2 is a schematic view showing a lug inclined plane formed by ultrasonic welding in the related art.

Referring to fig. 2, in the related art, the auxiliary tab 31 has a regular rectangular sheet structure. When welding, the welding head can be aligned with the auxiliary welding tab 31 and pressed down to be close to the positive electrode tab 21, so that a certain pressure is given to the positive electrode tab 21, and ultrasonic vibration is generated. In this case, the positive electrode tab 21 may be divided into a stressed portion 211 and a non-stressed portion 212, wherein the stressed portion 211 is kept in a plane parallel to the auxiliary tab 31, and the non-stressed portion 212 is inclined, so that the auxiliary tab with a sheet structure intersects with the non-stressed portion 212 at a point, and the intersecting welding points 311 and 312 are stressed most. It should be noted that, in fig. 2, instead of the unstressed portion 212 being a slope, the unstressed portion 213 and the unstressed portion 214 may be slopes. That is, in the present utility model, there may be three inclined planes where points intersect. Taking the non-stressed portion 212 as an example, when the pressure applied by the welding head increases to some extent, cracking may occur at the weld points 311 and 312.

In view of the above, the present utility model provides a battery, the battery including a top cap assembly, a winding core connected to the top cap assembly, and at least one auxiliary tab, the top cap assembly including at least one electrode lead, the winding core including at least one tab, each tab being welded to the electrode lead corresponding to the tab by the auxiliary tab corresponding to the tab, wherein: the electrode lug comprises a stress part and a non-stress part connected with the stress part, and the auxiliary welding lug comprises a bending part and a non-bending part connected with the bending part; the non-bending part is used for being attached to the corresponding stress part of the tab after welding, and the bending part is used for being attached to the corresponding non-stress part of the tab after welding.

The auxiliary welding tab of the winding core is bent to form a bending part and a non-bending part connected with the bending part, the non-bending part of the auxiliary welding tab is attached to the stressed part of the tab corresponding to the auxiliary welding tab, and the bending part of the auxiliary welding tab is attached to the non-stressed part of the tab corresponding to the auxiliary welding tab.

The battery of the embodiment of the utility model can be a lithium ion battery. A lithium ion battery is a secondary battery that mainly operates by means of lithium ions moving between a positive electrode and a negative electrode. In the charge and discharge process, lithium ions are inserted and extracted back and forth between the two electrodes; during charging, lithium ions are deintercalated from the positive electrode and are intercalated into the negative electrode through the electrolyte, the negative electrode is in a lithium-rich state, and the movement direction of the lithium ions during discharging is opposite to that of the lithium ions during charging. It will be appreciated that the utility model is not limited in terms of the type of battery.

According to the embodiment of the utility model, each tab can be welded with the electrode pin corresponding to the tab through an ultrasonic welding machine. The ultrasonic welding machine can transmit high-frequency vibration waves to two metal surfaces to be welded, and under the condition of pressurization, the metal surfaces are rubbed with each other to form fusion between the molecular layers.

Fig. 3 is a schematic perspective view of an auxiliary tab according to an embodiment of the present utility model.

As shown in fig. 3, the auxiliary tab according to the embodiment of the present utility model may include a bent portion 33 and a non-bent portion 61. The bending portion 33 may include a first sub-bending portion 331, a second sub-bending portion 332, and a third sub-bending portion 333. The first sub-bent portion 331, the second sub-bent portion 332, and the third sub-bent portion 333 may intersect with the non-bent portion 61, respectively.

The first sub-bending portion 331, the second sub-bending portion 332, the third sub-bending portion 333, and the non-bending portion 61 may form an auxiliary soldering lug similar to a dustpan shape. Illustratively, the non-bending portion 61 is disposed in a horizontal direction, and the first sub-bending portion 331, the second sub-bending portion 332, and the third sub-bending portion 333 are disposed obliquely with respect to the non-bending portion 61 disposed horizontally. The degree of inclination of the first sub-bending portion 331, the second sub-bending portion 332, and the third sub-bending portion 333 may be the same, or may be adjusted as necessary, and the degree of inclination of each sub-bending portion is not limited in the present utility model.

The second sub-bending portion 332 may be connected to the first sub-bending portion 331 and the third sub-bending portion 333, respectively. The first sub-bent portion 331, the second sub-bent portion 332, and the third sub-bent portion 333 may be integrally formed. Of course, the first sub-bent portion 331, the second sub-bent portion 332, and the third sub-bent portion 333 may be provided independently of each other, and the bent portions may be formed by assembling them. Illustratively, the first sub-bend 331 is mirror symmetrical to the third sub-bend 333.

Wherein, at different positions of the sub-bending part, the thickness of the sub-bending part can be different. Of course, the thicknesses of the sub-bending portions can be the same at different positions of the sub-bending portions, so that the production is facilitated. For example, in fig. 3, for the first sub-bent portion 331, the thickness of the first sub-bent portion 331 near the non-bent portion 61 may be thicker, and the thickness of the first sub-bent portion 331 far from the non-bent portion 61 may be thinner, i.e., the thickness of the first sub-bent portion 331 near the non-bent portion 61 may be greater than the thickness of the first sub-bent portion 331 far from the non-bent portion 61. Through setting up the thickness of sub different positions of portion of bending in a flexible way, can leave more abundant space.

At least one of the first sub-bent portion 331, the second sub-bent portion 332, and the third sub-bent portion 333 may be an inclined surface. The inclined surface may be a flat inclined surface. For example, the first sub-bending portion 331 may be inclined, and the first sub-bending portion 331 and the non-bending portion 61 disposed horizontally may form an acute angle. In the present utility model, one or all of the sub-bent portions may be inclined with respect to each of the bent portions.

Referring to fig. 3, at least one of the first sub-bending portion 331, the second sub-bending portion 332, and the third sub-bending portion 333 may be an arc surface. For example, the first sub-bending portion 331 is an arc surface, the tangent plane of the arc surface may form an included angle with the non-bending portion 61, and the formed included angle may be used to represent the radian of the arc surface. The radians of the first sub-bending portion 331, the second sub-bending portion 332, and the third sub-bending portion 333 may be the same or may be set as needed. In the present utility model, for each bending portion, one of the sub-bending portions may be an arc surface, or all of the sub-bending portions may be arc surfaces.

Taking fig. 3 as an example, the tab may be disposed on the outer side of the auxiliary soldering lug and attached to the auxiliary soldering lug; the weld head may act on the inside of the auxiliary lug, for example above the non-bent portion 61, to exert pressure on the auxiliary lug. The shape of the tab may be a multi-layered structure. Notably, the tab stress deformation may occur during pre-welding, which occurs prior to ultrasonic welding. After ultrasonic welding, the non-bending part of the auxiliary welding lug is attached to the stressed part of the lug corresponding to the auxiliary welding lug, and the bending part of the auxiliary welding lug is attached to the non-stressed part of the lug corresponding to the auxiliary welding lug.

The shape of each sub-bending portion in fig. 3 may be modified in other ways. For example, in the first sub-bending portion 331, a part of the first sub-bending portion may be an inclined surface, and a part of the first sub-bending portion may be an arc surface. It is to be understood that the present utility model is not limited to the specific shape of each sub-bent portion.

In one embodiment, as shown in fig. 3, the non-bending portion 61 may be provided with at least one hole, such as the hole 51 in fig. 3. The holes may be arranged in rows and columns. Illustratively, the holes may be uniformly aligned. In practical application, parameters such as the opening size, the position and the shape of each hole can be set according to the needs. It will be appreciated that the utility model is not limited to the specific location and configuration of each of the holes.

With continued reference to fig. 3, each of the holes may further include a first sub-aperture and a second sub-aperture. For example, in fig. 3, the hole 51 may include a first sub-hole 511 and a second sub-hole 512. The first sub-hole 511 may communicate with the second sub-hole 512, and the diameter of the second sub-hole 512 may be larger than that of the first sub-hole 511. In fig. 3, the first sub-hole 511 is provided on a side facing the bending portion 33, and the second sub-hole 512 is provided on a side away from the bending portion 33.

Fig. 4 shows a schematic plan view of an auxiliary tab according to an embodiment of the present utility model.

As shown in fig. 4, the auxiliary tab of fig. 3 is seen from a top view, and the planar structure of the auxiliary tab can be seen more clearly. In fig. 4, the edge of the first sub-bending portion 331 and the edge of the second sub-bending portion 332 may be connected by a bent angle of a predetermined arc, and similarly, the edge of the third sub-bending portion 333 and the edge of the second sub-bending portion 332 may be connected by a bent angle of a predetermined arc. In addition, two rows of holes uniformly arranged may be provided on the non-bent portion 61.

By way of example, with reference to fig. 3 and 4, the auxiliary lug of fig. 4 may have a length of a mm in the horizontal direction and a width of b mm in the vertical direction as a whole; the non-bent portion 61 in the auxiliary tab may have a length of c mm in the horizontal direction and a width of d mm in the vertical direction. The non-bending portion 61 in fig. 3 includes a three-sided bending edge, the boundary between the first sub-bending portion 331 and the non-bending portion 61 may be r millimeters, and the boundary between the first sub-bending portion 331 and the second sub-bending portion 332 may be s millimeters; the other side of the first sub-bending portion 331 may be p millimeters, and the upper edge of the first sub-bending portion 331 may be q millimeters. The first sub-bending portion 331 has a slope that may be the same as a pre-welded tab slope for attaching the pre-welded tab.

Fig. 5 shows a schematic perspective view of an adhesive tape according to an embodiment of the present utility model.

As shown in fig. 5, the adhesive tape according to the embodiment of the present utility model may have an elongated shape, and may include a head portion 71, a middle portion 72, and a tail portion 73. Wherein the head 71 may be provided with a plurality of cylindrical protrusions, for example, cylindrical protrusions 711, each of which may have an equal diameter. The diameter of the cylindrical protrusion 711 may be smaller than the diameter of the first sub-hole 511 in fig. 3.

Wherein the tape may be made of polyethylene terephthalate (polyethylene glycol terephthalate, PET) material to form a plastic. The PET plastic has the characteristics of high temperature resistance, acid and alkali resistance, solvent resistance, electrical insulation and the like, and has excellent performance. The tail 73 of the tape may be coated with an acid-base acrylic pressure sensitive adhesive 731 to improve the adhesive ability of the tape.

Fig. 6 shows a schematic plan view of an adhesive tape according to an embodiment of the present utility model.

As shown in fig. 6, the planar structure of the adhesive tape of fig. 5 can be seen more clearly from a top view. In fig. 6, the head portion 71, the middle portion 72 and the tail portion 73 of the tape are arranged in this order from left to right.

For example, referring to fig. 3, 5 and 6, the hole of the non-bent portion in fig. 3 may be divided into two layers, the diameter of the upper layer (i.e., the first sub-hole) may be n mm, and the diameter of the lower layer (i.e., the second sub-hole) may be f mm; the tape in fig. 6 may have a width of c mm in the vertical direction and a length of x mm in the horizontal direction. In fig. 5, the head of the tape may be provided with a plurality of cylindrical protrusion structures having a diameter of h mm and a height of 1 mm in one-to-one correspondence with the auxiliary lug holes. The diameter of the cylinder may be smaller than the diameter of the first sub-aperture (i.e. h is smaller than n). Illustratively, the letters, such as a, b, etc., used to represent the dimensions of the embodiments of the present utility model may be natural numbers.

The size of one adhesive tape is corresponding to the size of the corresponding non-bending part. Illustratively, the width of the adhesive tape may be equal to the length of the non-bent portion 61 of the auxiliary tab in the horizontal direction, so that the head of the adhesive tape is rapidly aligned with the ultrasonic welding portion during welding, thereby further improving the assembly efficiency of the battery.

In an embodiment, the cylindrical protrusion is disposed corresponding to one hole of the non-bending portion, and passes through the hole to form a mushroom head structure, and the mushroom head structure is used for locking the adhesive tape with the non-bending portion. For example, the cylindrical protrusion 711 may be provided corresponding to the hole 51. The cylindrical protrusion 711 may pass through the hole 51, and the welding is performed to form a mushroom head structure by a portion of the cylindrical protrusion extending below the hole 51, so as to achieve the purpose of tightly connecting the adhesive tape with the non-bending portion.

When the electrode lugs are subjected to ultrasonic welding, the adhesive tape and the auxiliary welding lug can be welded with the electrode lugs at the same time. Specifically, can place the auxiliary lug on the utmost point ear (bending portion upwards), the sticky tape head is placed on the auxiliary lug, a plurality of cylinder protruding structures on the sticky tape and a plurality of riveting holes on the auxiliary lug one-to-one to pass the hole. And then, utilizing the ultrasonic welding and rivet welding principle to weld the cylindrical structure on the tab adhesive tape into a mushroom head, and tightly locking with the rivet hole, so as to achieve the effect of connecting the adhesive tape head with the auxiliary welding lug. Simultaneously, ultrasonic waves are continuously transmitted to the lower lug, so that the purpose of welding the coiled core lug is achieved.

After welding, the tab is firmly fixed, and the head of the adhesive tape is tightly connected with the tab. At the moment, the battery is turned over, the tail of the adhesive tape is stuck to the pin of the top cover assembly below the tab along the potential, and then the tab adhesive tape sticking work is completed, so that the whole tab ultrasonic welding and tab adhesive tape sticking process is completed simultaneously.

In summary, on the one hand, in the embodiment of the utility model, when the tab is ultrasonically welded, the auxiliary welding tab has a bending structure, and the inclined plane of the tab after pre-welding can be attached, so that the connection between the auxiliary welding tab with a planar structure and the tab point at the inclined plane after pre-welding is avoided, the phenomenon of tab breakage caused by overlarge tab stress is improved, and the stability and safety of the battery are improved; on the other hand, after the novel auxiliary welding tab and the novel adhesive tape are adopted, the two working procedures of original tab ultrasonic welding and tab adhesive tape sticking can be combined into one step, so that the battery assembly flow is reduced, and the manpower and material resources consumed by manual adhesive tape sticking are reduced.

Further, an embodiment of the present utility model provides a charge and discharge apparatus including the battery. It will be appreciated that the utility model is not limited to the specific application scenario of the battery.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The battery and the charge-discharge device provided by the embodiment of the utility model are described in detail, and specific examples are applied to illustrate the principle and the implementation of the utility model, and the description of the above embodiments is only used for helping to understand the technical scheme and the core idea of the utility model; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. The utility model provides a battery, its characterized in that, the battery includes the top cap subassembly, with the core of a roll that the top cap subassembly meets and at least one auxiliary welding piece, the top cap subassembly includes at least one electrode pin, the core of a roll includes at least one tab, each the tab is welded with the electrode pin that this tab corresponds through the auxiliary welding piece that this tab corresponds respectively, wherein:

the electrode lug comprises a stress part and a non-stress part connected with the stress part, and the auxiliary welding lug comprises a bending part and a non-bending part connected with the bending part;

the non-bending part is used for being attached to the corresponding stress part of the tab after welding, and the bending part is used for being attached to the corresponding non-stress part of the tab after welding.

2. The battery of claim 1, wherein the bend comprises a first sub-bend, a second sub-bend, and a third sub-bend, wherein: the first sub-bending part, the second sub-bending part and the third sub-bending part are intersected with the non-bending part.

3. The battery according to claim 2, wherein the second sub-bending portions are respectively connected to the first sub-bending portions and the third sub-bending portions, and the first sub-bending portions and the third sub-bending portions are symmetrically arranged.

4. The battery of claim 3, wherein at least one of the first, second, and third sub-bends is beveled.

5. The battery of claim 3, wherein at least one of the first, second, and third sub-bends is a cambered surface.

6. The battery of claim 1, wherein the non-bent portion is provided with at least one hole, each of the holes being arranged in a row and column.

7. The battery of claim 6, wherein each of the holes includes a first sub-hole in communication with a second sub-hole having a diameter greater than the diameter of the first sub-hole.

8. The battery of claim 7, further comprising at least one tape comprising a head portion, a middle portion, and a tail portion, wherein: the head of one adhesive tape is provided with at least one cylindrical bulge, and the diameter of each cylindrical bulge is smaller than that of the first sub-hole.

9. The battery of claim 8, wherein one of the cylindrical protrusions is disposed corresponding to one of the holes of the non-bent portion and forms a mushroom head structure through the hole, the mushroom head structure being used to lock the adhesive tape to the non-bent portion.

10. A charge-discharge apparatus, characterized in that it comprises the battery according to any one of claims 1 to 9.