CN215869707U

CN215869707U - Battery and electric vehicle with same

Info

Publication number: CN215869707U
Application number: CN202121741871.0U
Authority: CN
Inventors: 房华禹; 郭小林; 王永光; 李金星; 王维; 陈思洁; 李海军
Original assignee: Yinlong New Energy Co Ltd
Current assignee: Yinlong New Energy Co Ltd
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2022-02-18
Anticipated expiration: 2031-07-28

Abstract

The utility model provides a battery and an electric vehicle with the same. The battery includes: a housing; the battery cell is arranged in the shell; the negative current collecting plate is welded with the battery cell and the shell; the cover plate is welded with the anode current collecting plate; and the cathode pole is welded with the cover plate. By applying the technical scheme of the utility model, the negative pole post is welded with the cover plate, so that the sealing and the current conduction of the battery are realized; the negative current collecting plate is welded with the battery core and the shell, and the cover plate is welded with the negative current collecting plate, so that an adapter plate in the prior art is omitted, the production material cost is reduced, the space of the adapter plate is reduced, the height of the battery is reduced, the size is obviously reduced, the volume energy density of the battery is improved, and the internal space of the battery is increased. Meanwhile, by adopting the technical scheme of the utility model, the production procedures are reduced, the problem of battery quality reduction caused by repeated welding is avoided, the cover plate can be used for bearing current, and the current bearing multiplying power of the battery is improved.

Description

Battery and electric vehicle with same

Technical Field

The utility model relates to the technical field of battery equipment, in particular to a battery and an electric vehicle with the same.

Background

Lithium batteries have been used as mainstream batteries in various fields such as electric vehicles and energy storage due to advantages such as high specific energy, long service life and wide working range.

At present, the electric automobile mainly faces the difficulty of short endurance mileage, and because the space reserved for the battery in the electric automobile is limited, the battery volume energy density directly determines the endurance mileage of the electric automobile, so that the improvement of the battery volume energy density becomes the main technical trend of the development of the electric automobile at present. Under the condition that the battery energy is not changed, how to optimize the structure and reduce the battery volume becomes an industrial difficulty.

In the prior art, a conventional cylindrical full-tab battery usually has a positive terminal with positive charges and a negative terminal and a housing with negative charges, so as to lead current to the housing. The brief flow of assembling the cathode of the cylindrical battery is shown in the attached figure 7: 010. preparing materials, wherein the assembly of a conventional cylindrical battery comprises a positive electrode assembly (a cover plate, a current collecting plate and a connecting sheet), a battery core, a shell, a current collecting plate, a connecting sheet, a negative electrode pole and a negative electrode cover plate; 020. the material assembly of the conventional cylindrical battery can be roughly divided into two types: 021. the cover plate is welded with the shell, and only the pole column position is reserved, so that the subsequent battery sealing is facilitated; 022. the pole is welded with the adapter plate, so that the current between the adapter plate and the battery pole is conveniently conducted; 030. the electric core is welded with the current collecting plate, and a negative pole lug of the electric core is welded with the current collecting plate, so that the current conduction between the electric core and the current collecting plate is facilitated; 040. the current collecting plate is welded with the adapter plate, and the adapter plate is welded with the current collecting plate of the battery cell, so that the current conduction between the battery cell and the adapter plate is facilitated; 050. the adapter plate is welded with the shell, the adapter plate is welded with the negative cover plate, and current is conducted to the shell while sealing is achieved. To this end, the current can form a complete conduction path within the cell: positive pole assembly → electric core → polar plate → adapter plate → negative pole post (casing).

The existing cylindrical battery structure assembly is complex, has various welding procedures and has more defects:

1. the cylindrical battery has complex structural components and higher material cost;

2. the welding procedures of the cylindrical battery are various, taking the negative electrode as an example, the welding procedures comprise 2 times of assembly welding and 3 times of cell welding, on one hand, different welding devices are needed for various welding, so that the production cost is greatly increased, on the other hand, poor welding can influence the performance of the cell and the assembly, so that the product yield and the quality are reduced;

3. because the adapter plate needs to bear the current of the pole, the thickness of the adapter plate is thick at present, and the adapter plate occupies more space inside the battery, so that the volume energy density of the battery is not high.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a battery and an electric vehicle with the same, and aims to solve the problem that the battery in the prior art is low in production quality.

In order to achieve the above object, according to one aspect of the present invention, a battery is provided. The battery includes: a housing; the battery cell is arranged in the shell; the negative current collecting plate is welded with the battery cell and the shell; the cover plate is welded with the anode current collecting plate; and the cathode pole is welded with the cover plate.

Furthermore, at least one sealing groove is formed in the outer circle of the anode current collecting plate, and part of the shell extends into the sealing groove.

Furthermore, a plurality of welding grooves are formed in the surface of the side, facing the negative electrode pole, of the negative current collecting plate, the welding grooves radially extend outwards from the geometric center of the negative current collecting plate along the radial direction of the negative current collecting plate, and a sealing groove is formed in the end portion, close to the inner circumferential surface of the shell, of at least one welding groove.

Furthermore, six welding grooves are formed, and a sealing groove is formed at the end part of each welding groove close to the inner peripheral surface of the shell.

Further, the shell is provided with a connecting portion, and at least part of the connecting portion is located in the sealing groove.

Further, the connecting portion is a connecting protrusion, a first end of the connecting protrusion is connected with the end portion of the shell, and a second end of the connecting protrusion extends along the circumferential direction of the shell.

Further, the connecting protrusion is provided in plurality, and the plurality of connecting protrusions are arranged at intervals along the circumferential direction of the housing.

Further, the first end of the welding groove is arranged close to the geometric center of the anode current collecting plate, the second end of the welding groove is arranged close to the inner circumferential surface of the shell, and the distance from the geometric center of the anode current collecting plate to the end of the second end of the welding groove is smaller than the outer diameter of the excircle of the anode current collecting plate.

Further, the axial height of the cell was 160 mm.

According to another aspect of the utility model, an electric vehicle is provided, which comprises a battery, wherein the battery is the battery.

By applying the technical scheme of the utility model, the negative pole post is welded with the cover plate, so that the sealing and the current conduction of the battery are realized; the negative current collecting plate is welded with the battery core and the shell, and the cover plate is welded with the negative current collecting plate, so that an adapter plate in the prior art is omitted, the production material cost is reduced, the space of the adapter plate is reduced, the height of the battery is reduced, the size is obviously reduced, the volume energy density of the battery is improved, and the internal space of the battery is increased. Meanwhile, by adopting the technical scheme of the utility model, the production procedures are reduced, the problem of battery quality reduction caused by repeated welding is avoided, the cover plate can be used for bearing current, and the current bearing multiplying power of the battery is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

fig. 1 shows a flow chart of the assembly of a battery according to the present invention;

fig. 2 shows an exploded structure diagram of an embodiment of a battery according to the present invention;

fig. 3 is a schematic view showing the structure of a first embodiment of an anode current collecting plate according to the present invention;

fig. 4 is a schematic view showing the structure of a second embodiment of an anode current collecting plate according to the present invention;

FIG. 5 shows a schematic structural view of an embodiment of a housing according to the present invention;

FIG. 6 shows a schematic structural view of an embodiment of a cover plate according to the present invention;

fig. 7 shows a schematic flow diagram of a prior art cylindrical battery cathode assembly.

Wherein the figures include the following reference numerals:

10. a housing; 11. a connecting projection; 20. an electric core;

30. a negative current collector; 31. a sealing groove; 32. welding a groove;

40. a cover plate; 50. and a cathode terminal.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.

In conjunction with fig. 1 to6, according to an embodiment of the present invention, a battery is provided. The battery includes: a housing 10; the battery cell 20, the battery cell 20 is disposed in the casing 10; the negative current collecting plate 30 is welded with the battery core 20 and the shell 10; a cover plate 40, the cover plate 40 being welded to the anode current collecting plate 30; the negative electrode post 50, the negative electrode post 50 and the cover plate 40 are welded.

As shown in fig. 2, the negative current collecting plate is welded to the cell and the case, and the cover plate is welded to the negative current collecting plate, so that the sealing and current conduction of the battery are realized, an adapter plate in the prior art is omitted, the production material cost is reduced, the space of the adapter plate is reduced, the height of the battery is reduced, the volume is remarkably reduced, the volume energy density of the battery is improved, and the internal space of the battery is increased. Meanwhile, by adopting the technical scheme of the utility model, the production procedures are reduced, the problem of battery quality reduction caused by repeated welding is avoided, the cover plate can be used for bearing current, and the current bearing multiplying power of the battery is improved.

At least one sealing groove 31 is formed on the outer circumference of the anode current collecting plate 30, and part of the case 10 extends into the sealing groove 31. Alternatively, the diameter of the outer circumference of anode current collecting plate 30 is equal to the diameter of the outer circumference of case 10, so that anode current collecting plate 30 is brought into contact with case 10, current conduction is achieved, and the volume of the battery is reduced. Meanwhile, as shown in fig. 3, anode current collecting plate 30 is provided with a plurality of injection holes. Part of case 10 extends to seal groove 31, and assembly of case 10 and anode current collecting plate 30 is achieved.

A plurality of welding grooves 32 are formed in the surface of the anode current collecting plate 30 facing the anode post 50, the plurality of welding grooves 32 radially extend outward from the geometric center of the anode current collecting plate 30 in the radial direction of the anode current collecting plate 30, and a sealing groove 31 is formed in the end of at least one welding groove 32 close to the inner circumferential surface of the case 10. As shown in fig. 3 and 4, a plurality of welding grooves 32 are provided radially outward from the geometric center of anode current collecting plate 30 in the radial direction of anode current collecting plate 30, so that anode current collecting plate 30 is uniformly stressed at the time of welding.

Alternatively, as shown in fig. 3 and 4, six welding grooves 32 are provided, and the end portion of each welding groove 32 on the side close to the inner peripheral surface of the casing 10 forms the seal groove 31, that is, six welding grooves 32 and six seal grooves 31 are provided.

The housing 10 is provided with a connection portion, at least a part of which is located in the seal groove 31. The case 10 and the anode current collecting plate 30 can be assembled by providing a connecting portion on the case 10 and locating a part of the connecting portion in the sealing groove 31.

The connecting portion is a connecting protrusion 11, a first end of the connecting protrusion 11 is connected with an end portion of the housing 10, and a second end of the connecting protrusion 11 extends along a circumferential direction of the housing 10. As shown in fig. 5, six coupling bosses 11 are uniformly provided at the end of the housing 10, and the coupling bosses 11 are assembled with the seal groove 31, specifically, the height of the coupling bosses 11 may be greater than or equal to the height of the weld groove 32. In practical application, the height and shape of the connecting protrusion 11 can be set according to practical requirements

The coupling protrusion 11 is plural, and the plural coupling protrusions 11 are provided at intervals in the circumferential direction of the housing 10. As shown in fig. 5, alternatively, the number of the coupling protrusions 11 is 6, and the number of the coupling protrusions 11 may be the same as that of the sealing groove 31 to facilitate assembly.

A first end of welding groove 32 is disposed near the geometric center of anode current collecting plate 30, a second end of welding groove 32 is disposed near the inner circumferential surface of case 10, and the distance from the geometric center of anode current collecting plate 30 to the end of the second end of welding groove 32 is smaller than the outer diameter of the outer circle of anode current collecting plate 30. Due to the arrangement, a certain distance is reserved between the second end of the welding groove 32 and the edge of the outer circle of the anode current collecting plate 30, a space can be reserved for the arrangement of the sealing groove 31, and assembly failure is avoided.

Alternatively, the axial height of the cell is 160 mm.

According to an embodiment of the present invention, there is provided an electric vehicle including a battery, wherein the battery is the above battery.

Specifically, the technical scheme provided by the utility model can improve the structure of the LTO66160 battery, and the height of the battery is 160 mm. Conventional LTO66160 cells have 5mm high transfer plates, and conventional LTO66160 cells have a volume (66 x 66)/4 x pi 160. The solution of the present invention was applied to conventional LTO66160 cells, with the adapter plate removed and the cell volume (66 x 66)/4 x pi 155. Compared with the conventional LTO66160 battery, the battery volume is only 96.875% of the original battery volume after the adapter plate is eliminated, and the volume energy density can be improved by 3.24% (energy/volume).

The improved battery assembly process is shown in fig. 1, and comprises the following specific steps:

010: preparing materials, wherein the assembly of a single battery comprises a positive electrode assembly, a battery core, a shell, a negative current collecting plate, a negative electrode pole and a cover plate;

020: the material assembly, in the embodiment, the material assembly mainly includes laser welding of the cathode pole and the cover plate, so that current conduction between the pole and the cover plate is facilitated;

030: welding the battery cell with the negative current collector plate, and performing laser or ultrasonic welding on a negative electrode lug of the battery cell and the polar plate to facilitate current conduction between the battery cell and the polar plate;

040: and welding the negative current collecting plate with the shell, and performing laser welding on the negative current collecting plate and the cover plate to conduct current to the shell while realizing sealing.

In the embodiment, the battery cathode pole and the cover plate are welded to achieve the current conducting and sealing functions at the same time, and generally, the thickness of the cover plate is larger than that of the adapter plate, so that the cover plate can bear larger current, and the multiplying power performance of the battery can be improved; the adapter plate structure is cancelled, so that the material cost is directly reduced, the battery volume is obviously reduced, and the energy density of the battery volume is increased. The battery directly welds the shell and the anode current collecting plate, so that the production equipment and labor cost are obviously reduced, and the problem of product quality reduction caused by repeated welding is avoided.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition to the foregoing, it should be noted that reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally throughout this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the utility model to effect such feature, structure, or characteristic in connection with other embodiments.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery, comprising:

a housing (10);

a battery cell (20), the battery cell (20) disposed within the housing (10);

the negative current collecting plate (30), and the negative current collecting plate (30) is welded with the battery core (20) and the shell (10);

a cover plate (40), the cover plate (40) being welded to the anode current collecting plate (30);

the negative pole post (50), the negative pole post (50) with apron (40) welding.

2. The battery according to claim 1, wherein at least one sealing groove (31) is formed in an outer circumference of the anode current collecting plate (30), and a part of the case (10) extends into the sealing groove (31).

3. The battery according to claim 2, wherein a plurality of welding grooves (32) are formed in a surface of the anode current collecting plate (30) facing the anode post (50), the plurality of welding grooves (32) extend radially outward from a geometric center of the anode current collecting plate (30) in a radial direction of the anode current collecting plate (30), and an end portion of at least one of the welding grooves (32) close to the inner circumferential surface of the case (10) forms the sealing groove (31).

4. The battery according to claim 3, wherein the number of the welding grooves (32) is six, and an end portion of each welding groove (32) on a side close to an inner peripheral surface of the case (10) forms the seal groove (31).

5. The battery according to claim 2, wherein the case (10) is provided with a connection part, at least part of which is located in the sealing groove (31).

6. The battery according to claim 5, wherein the connecting portion is a connecting protrusion (11), a first end of the connecting protrusion (11) is connected with an end portion of the case (10), and a second end of the connecting protrusion (11) is extended in a circumferential direction of the case (10).

7. The battery according to claim 6, wherein the connecting projection (11) is plural, and the plural connecting projections (11) are provided at intervals in a circumferential direction of the case (10).

8. The battery according to claim 3, wherein a first end of the welding groove (32) is disposed near a geometric center of the anode current collecting plate (30), a second end of the welding groove (32) is disposed near an inner circumferential surface of the case (10), and an end portion of the geometric center of the anode current collecting plate (30) disposed to the second end of the welding groove (32) is spaced apart from an outer diameter of an outer circle of the anode current collecting plate (30).

9. The cell defined in claim 1, wherein the cell has an axial height of 160 mm.

10. An electric vehicle comprising a battery, characterized in that the battery is a battery according to any one of claims 1 to 9.