CN216818554U

CN216818554U - Electrical connection sheet and battery pack

Info

Publication number: CN216818554U
Application number: CN202123451328.XU
Authority: CN
Inventors: 陈熙; 邓磊
Original assignee: Ecoflow Technology Ltd
Current assignee: Ecoflow Technology Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-06-24
Anticipated expiration: 2031-12-31

Abstract

The utility model belongs to the technical field of battery packs, and particularly relates to an electric connecting sheet and a battery pack. The electric connecting sheet comprises a connecting sheet body and a welding elastic sheet. The connecting sheet body is provided with a welding opening. The welding shell fragment corresponds the setting with the welding mouth, and the welding shell fragment includes elasticity kink and weld part, and weld part and connection piece body are spaced mutually to just setting up to the welding mouth, one side that the weld part dorsad connection piece body is equipped with the welding bump, and the one end of elasticity kink links to each other with the connection piece body, and the other end of elasticity kink links to each other with the weld part. The welding reliability of the welding part and the battery cell is improved, so that the welding method can be applied to welding of the electric connection sheet with large thickness, and the welding effect is good.

Description

Electrical connection sheet and battery pack

Technical Field

The utility model belongs to the technical field of battery packs, and particularly relates to an electric connecting sheet and a battery pack.

Background

At present, an energy storage power supply generally has a battery pack, and the existing battery pack includes a support, battery cells installed in the support, and nickel plates installed on a casing, and the battery cells are connected in series or in parallel through the nickel plates to form a complete battery pack.

The spot welding or the pin welding is a welding technology which utilizes the resistance between the contact surfaces of two workpieces to instantly pass through low voltage and large current so as to instantly heat the contact surfaces of two mutually butted metals until the contact surfaces are melted and fused.

For a battery pack with a small output current, the current flowing requirement can be met by generally adopting the existing flat nickel sheet needle welding mode, and with the increase of the output current of the battery pack, the current flowing capacity of the nickel sheet needs to be increased, and the thickness of the nickel sheet is often increased.

At the moment, the condition of insufficient soldering is easy to occur by adopting the flat nickel sheet pin soldering mode for soldering, so that the soldering reliability is reduced, and the soldering effect is poor. Therefore, the structure of the battery core of the traditional battery pack is not firm and the safety and the reliability are low after the battery core is welded by the nickel sheets.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of this application is to provide an electric connection piece, aim at solving the problem of how to improve the welding connection reliability of electric connection piece and electric core.

In order to achieve the purpose, the technical scheme adopted by the application is as follows:

in a first aspect, there is provided an electrical connection sheet comprising:

the connecting piece body is provided with a welding port;

the welding shell fragment, the welding shell fragment with the welding mouth corresponds the setting, the welding shell fragment includes elasticity kink and weld part, the weld part with the connection piece body looks interval, and just right the welding mouth sets up, the weld part dorsad one side of connection piece body is equipped with the welding bump, the one end of elasticity kink with the connection piece body links to each other, the other end of elasticity kink with the weld part links to each other.

In some embodiments, the number of the welding openings and the number of the welding elastic pieces are multiple, the welding openings are arranged at intervals, and at least one welding elastic piece is correspondingly arranged at each welding opening.

In some embodiments, each welding port is correspondingly provided with two welding elastic pieces, one end of each elastic bending portion of the two welding elastic pieces is respectively connected with the connecting sheet bodies on two opposite sides of the welding port, the welding portions of the two welding elastic pieces are opposite at intervals, and the two welding portions are located on the same side of the connecting sheet body.

In some embodiments, the number of the welding bumps is at least two, and the welding bumps are arranged at intervals;

or the welding salient point is positioned at one end of the welding part, which is far away from the elastic bending part, and is close to the edge of the welding part.

In some embodiments, one end of the elastic bending portion is connected to the connecting sheet body at the welding interface, and the other end of the elastic bending portion extends obliquely in a direction away from the welding interface and is connected to the welding portion.

In some embodiments, an orthographic projection of the welding shrapnel on the connecting sheet body is located in the welding opening.

In some embodiments, the connecting sheet body is provided with a plurality of positioning holes arranged at intervals, and the positioning holes are used for matching with positioning columns on the battery pack shell so as to realize positioning of the connecting sheet body;

or, the connecting sheet body is provided with an avoiding hole, and the avoiding hole is used for avoiding a connecting column on the battery shell.

In some embodiments, the connecting piece body is provided with a circuit board connecting piece, and the free end of the circuit board connecting piece is of a split structure.

In some embodiments, the circuit board connection pad comprises a power output pad for connecting with a circuit board to output current;

and/or the circuit board connecting piece comprises a voltage acquisition piece, and the voltage acquisition piece is used for being connected with the circuit board to output the voltage of the battery cell.

In a second aspect, another object of the present application is to provide a battery pack, which includes the electrical connection sheet, a bracket and a battery cell disposed in the bracket, wherein the electrical connection sheet is assembled on the bracket, and a welding portion of the electrical connection sheet is welded to the battery cell.

The application provides an electric connection piece's beneficial effect lies in: the welding part and the connecting sheet body are connected through the elastic bending part with elastic restoring force, so that the spatial position of the welding part can be adjusted through the proper elastic deformation stroke of the elastic bending part, the welding part and the battery cell can always be in full contact during welding, and the welding reliability of the welding part and the battery cell is improved; one side of welding part dorsad connection piece body is equipped with the welding bump, is convenient for melt the welding to can be applied to the welding of the electric connection piece of big thickness, and welding effect is good.

The application provides a battery package's beneficial effect lies in: the welding part and the connecting sheet body are connected through the elastic bending part with elastic restoring force, so that the spatial position of the welding part can be adjusted through the proper elastic deformation stroke of the elastic bending part, the welding part and the battery cell can always be in full contact during welding, and the welding reliability of the welding part and the battery cell is improved; one side of welding part dorsad connection piece body is equipped with the welding bump, is convenient for melt the welding to can be applied to the welding of the electric connection piece of big thickness, improved the range of application of battery package, and it is effectual to weld.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or exemplary technical descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic perspective view of an electrical connection sheet according to an embodiment of the present disclosure;

FIG. 2 is a schematic perspective view of an electrical connection sheet in another embodiment of FIG. 1;

FIG. 3 is a schematic perspective view of an electrical connection tab in yet another embodiment of FIG. 1;

fig. 4 is a schematic perspective view of an electrical connection sheet according to another embodiment of the present application;

FIG. 5 is a schematic perspective view of an electrical connection tab of the further embodiment of FIG. 4;

fig. 6 is a schematic perspective view of a battery pack provided in an embodiment of the present application;

FIG. 7 is a schematic cross-sectional view of the battery pack of FIG. 6 along direction A-A;

fig. 8 is an exploded schematic view of the battery pack of fig. 6;

FIG. 9 is a perspective view of the bracket of FIG. 8;

fig. 10 is a perspective view of a stent in a further embodiment.

Wherein, in the figures, the respective reference numerals:

100-electric connection sheet 10-connection sheet body 11-welding mouth

20-welding part.21-welding salient point.3-elastic bending part

24-welding spring piece 40-circuit board connecting piece 41-split structure

51-avoiding hole.52-positioning hole.200-battery pack

30-support 31-battery cell 32-mounting groove

33-fixed groove

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and operate, and thus are not to be construed as limiting the present application, and the specific meanings of the above terms may be understood by those skilled in the art according to specific situations. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.

In the prior art, for a battery pack with a small output current, the current flowing requirement can be met by generally adopting the existing flat nickel sheet needle welding mode, and with the increase of the output current of the battery pack, the nickel sheet needs to increase the current flowing capacity and often needs to increase the thickness of the nickel sheet.

At the moment, the condition of insufficient soldering is easy to occur by adopting the flat nickel sheet pin soldering mode for soldering, so that the soldering reliability is reduced, and the soldering effect is poor. Therefore, the structure of the battery core of the traditional battery pack is not firm after the nickel sheets are welded, and the safety and the reliability are low

Therefore, the embodiment of the application provides an electric connection sheet 100, and the reliability of welding between a welding part and a battery core is improved, so that the electric connection sheet 100 with large thickness can be applied to a welding range, and the welding effect is good.

In a first aspect, referring to fig. 1 and fig. 3, an electrical connection sheet 100 is provided in an embodiment of the present application, in which a plurality of battery cells 31 are connected in series or in parallel to form a battery pack. The electrical connection sheet 100 includes: connecting piece body 10, welding shell fragment 24. The connecting piece body 10 is provided with a welding opening 11. The welding elastic sheet 24 is arranged corresponding to the welding port 11.

Optionally, the welding elastic piece 24 includes an elastic bending portion 23 and a welding portion 20, the welding portion 20 is spaced apart from the connecting sheet body 10 and is disposed right opposite to the welding opening 11, a welding protrusion 21 is disposed on a side of the welding portion 20 opposite to the connecting sheet body 10, one end of the elastic bending portion 23 is connected to the connecting sheet body 10, and the other end of the elastic bending portion 23 is connected to the welding portion 20.

Optionally, the connecting sheet body 10, the soldering portion 20 and the elastic bending portion 23 are made of conductive material. Alternatively, the connecting piece body 10, the welding portion 20, and the elastic bent portion 23 are all made of nickel sheet. The nickel sheet can be made of a metal steel sheet and plated with nickel, and the metal nickel is silver white metal and has magnetism, good conductivity and plasticity.

Referring to fig. 1 and 3, optionally, the connecting sheet body 10 is provided with a welding opening 11, and the welding opening 11 may be circular, square or oval. In this embodiment, the shape of the welding opening 11 is rectangular. It is understood that the welding ports 11 penetrate both side surfaces of the tab body 10.

Referring to fig. 1 and fig. 3, optionally, one end of the elastic bending portion 23 extends into the welding opening 11 and is connected to the connecting piece body 10 at the welding opening 11, and the other end of the elastic bending portion 23 extends to and is connected to the welding portion 20.

It can be understood that, if there is a certain distance interval between the welding part 20 and the battery cell 31 during welding, the elastic deformation of the elastic bending part 23 causes the welding part 20 to move outward by a predetermined distance in a direction away from the connecting sheet body 10, so that the welding part 20 is kept in contact with the battery cell 31 during welding, and the welding bump 21 is melted, so that the welding part 20 is welded to the battery cell stably and reliably.

It is understood that, if the distance between the welding portion 20 and the battery cell 31 is too short, the welding portion 20 may be moved inward toward the connecting tab body 10 by a predetermined distance, so that the welding portion 20 can be kept in contact with the battery cell 31, and the welding bump 21 is melted, so that the welding portion 20 and the battery cell can be stably and reliably welded.

Referring to fig. 1 and 3, the welding portion 20 is disposed between the battery cell 31 and the connecting sheet body 10, and the elastic bending portion 23 with elastic restoring force is used to connect the welding portion 20 and the connecting sheet body 10, so that the spatial position of the welding portion 20 can be adjusted by an appropriate elastic deformation stroke of the elastic bending portion 23, the welding portion 20 and the battery cell 31 can always keep sufficient contact during welding, and the welding bumps 21 are melted to stably and reliably weld the welding portion 20 and the battery cell, thereby improving the welding reliability of the welding portion 20 and the battery cell 31, and being applicable to welding of the electrical connection sheet 100 with large thickness, and having good welding effect.

In some embodiments, the number of the welding openings 11 and the number of the welding elastic sheets 24 are multiple, the welding openings 11 are arranged at intervals, and at least one welding elastic sheet 24 is correspondingly arranged on each welding opening 11.

Referring to fig. 4 and fig. 6, it can be understood that a plurality of welding openings 11 may be formed on the connecting sheet body 10, each welding opening 11 is at least provided with an elastic bending portion 23, and each elastic bending portion 23 is connected to a welding portion 20.

Referring to fig. 4 and 6, in some embodiments, the connecting piece body 10, the welding portion 20 and the elastic bending portion 23 are integrally formed.

Alternatively, the connecting sheet body 10, the welding portion 20 and the elastic bending portion 23 may be integrally formed by a steel strip plated with nickel metal through a stamping process, which is efficient and suitable for mass production.

Optionally, the thickness of the steel strip is in the range of 0.2-0.4 mm.

In some embodiments, each welding opening 11 is correspondingly provided with two welding elastic pieces 24, one end of each elastic bending portion 23 of each welding elastic piece 24 is respectively connected with the connecting piece body 10 on two opposite sides of the welding opening 11, the welding portions 20 of the two welding elastic pieces 24 are opposite at intervals, and the two welding portions 20 are located on the same side of the connecting piece body 10.

Referring to fig. 4 and fig. 6, alternatively, the two elastic bending portions 23 are respectively connected to two opposite hole edges of the welding opening 11 and are both connected to the connecting sheet body 10, and one ends of the two welding portions 20 extend oppositely and make the welding bumps 21 on the two welding portions 20 adjacently disposed.

In some embodiments, the surface of the welding portion 20 facing away from the connecting piece body 10 is convexly provided with at least two welding bumps 21, and the welding bumps 21 are arranged at intervals.

In some embodiments, referring to fig. 4 and fig. 6, in some embodiments, the welding bump 21 is located at an end of the welding portion 20 away from the elastic bending portion 23 and is disposed near an edge of the welding portion 20. The welding salient points 21 are located at the edge of the welding part 20, so that when the two welding parts 20 extend oppositely, the welding salient points 21 on the two welding parts 20 are adjacently arranged, so that in the welding process of the welding part 20 and the battery core 31, the positions of positive and negative welding points are closer, the welding current is more concentrated, the welding current is prevented from being shunted from other positions, and the welding effect is improved.

Referring to fig. 4 and fig. 6, optionally, in the present embodiment, the number of the solder bumps 21 is two. The height range of the welding salient points 21 is 0.2-0.4 mm.

It can be understood that the welding bumps 21 are pre-protruded on the welding portion 20, so that after the battery cell 31 is welded at the welding portion 20, welding points can be correspondingly formed at the positions of the welding bumps 21, and corresponding welding points are simultaneously formed on the welding bumps 21 on the same welding portion 20, so that repeated operation is not needed, and the welding efficiency is greatly improved.

Alternatively, in providing a plurality of welding portions 20, the welding bumps 21 may be disposed adjacently to avoid current division.

In some embodiments, one end of the elastic bending portion 23 is connected to the connecting piece body 10 at the welding opening 11, and the other end of the elastic bending portion 23 extends obliquely away from the welding opening 11 and is connected to the welding portion 20.

Referring to fig. 4 and 6, it can be understood that the elastic bending portion 23 is obliquely arranged in advance, so that after the welding portion 20 is connected to the elastic bending portion 23, the free end of the welding portion 20 is extended to a predetermined distance from the connecting sheet body 10, so that when the connecting sheet body 10 and the battery cell 31 are mounted and positioned, the battery cell 31 pushes the welding portion 20, and the welding portion 20 is tightly attached to the battery cell 31 under the reaction of the elastic force of the elastic bending portion 23, so that the welding portion 20 is fully contacted with the battery cell 31, the occurrence of a desoldering field is avoided, and the reliability of welding the welding portion 20 and the battery cell 31 is improved.

In some embodiments, the projection of the welding portion 20 on the connecting piece body 10 is located in the welding opening 11.

Referring to fig. 4 and 6, alternatively, the free edges of the two welding portions 20 and the hole edge of the welding opening 11 are spaced apart, and the two welding portions 20 are spaced apart from one end of the corresponding elastic bending portion 23, so that an i-shaped groove is formed between the welding portion 20 and the connecting piece body 10 and between the two welding portions 20. The i-shaped groove can prevent shunt current from burning the connecting sheet body 10 when the battery cell 31 and the welding part 20 are subjected to spot welding.

Optionally, since the two welding portions 20 are respectively disposed on the two opposite sides, compared with the case where the two welding portions 20 are connected on the same side, in the case where the sizes of the welding openings 11 are the same, each welding portion 20 in the present embodiment has a larger cross-sectional area, and is stronger in current capacity, and is applicable to the battery cell 31 with a large output current.

Referring to fig. 4 and 6, in some embodiments, the connecting sheet body 10 is provided with a plurality of positioning holes 52 arranged at intervals, and the positioning holes 52 are used for matching with the positioning posts 25 on the battery pack housing to position the connecting sheet body 10.

In some embodiments, the connecting sheet body 10 further has an avoiding hole 51 for avoiding the connecting column on the battery case.

Optionally, the locating holes 52 facilitate locating the connector piece body 10 during installation, while the clearance holes 51 facilitate threading of a screw post or screw to screw the connector piece body 10 to another structural member, such as the bracket 30. Through the cooperation of locating hole 52 and reference column 25, the quick location of battery package casing and electric connection piece 100 is facilitated. And by avoiding the hole to match with the connecting post, the electric connecting sheet 100 can be conveniently and rapidly mounted and positioned on the shell of the battery pack.

In some embodiments, a circuit board connecting sheet 40 is disposed on the connecting sheet body 10, and a free end of the circuit board connecting sheet 40 is a forked structure 41. Optionally, the circuit board connecting piece 40 is used to electrically connect the connecting piece body 10 to a circuit board to output electrical signals, including voltage and current.

Optionally, the fork structure 41 can facilitate the circuit board connecting sheet 40 to be fused with the soldering tin during soldering, so as to increase the connection stability with the circuit board.

In some embodiments, the circuit board connection pads 40 include power output pads for connecting with a circuit board to output current. Alternatively, the power output tab 42 may be provided with a plurality of sub-connection tabs to increase the current output capability while facilitating the bending connection with the circuit board.

In some embodiments, the circuit board connection pads 40 include voltage collection pads for connecting with a circuit board to output the voltage of the cells. The voltage acquisition sheet 40 is used for acquiring a voltage value of the battery cell 31 in the area corresponding to the connection sheet body 10 and outputting the voltage value to the circuit board so as to analyze and judge whether the battery cell 31 is normal.

Alternatively, the power output chip is integrally formed with the tab body 10.

Optionally, the voltage collecting tab is integrally formed with the tab body 10.

In a second aspect, please refer to fig. 7 and fig. 9, the present invention further provides a battery pack 200, the battery pack 200 includes an electrical connection sheet 100, the specific structure of the electrical connection sheet 100 refers to the above embodiments, and since the battery pack 200 adopts all the technical solutions of all the above embodiments, all the beneficial effects brought by the technical solutions of the above embodiments are also achieved, which is not repeated herein.

Referring to fig. 7 and 9, in some embodiments, a plurality of electrical connection sheets 100 are provided, the battery pack 200 further includes a battery cell 31 and a bracket 30 for fixing the battery cell 31, a plurality of battery cells 31 are provided in the bracket 30, each electrical connection sheet 100 is sequentially and linearly arranged on the bracket 30 at intervals, and each welding portion 20 is electrically welded to one battery cell 31.

Referring to fig. 7 and 9, optionally, a mounting groove 32 is formed in a position of one side surface of the support 30 corresponding to each connection piece body 10, the connection piece bodies 10 are accommodated in the corresponding mounting grooves 32, a fixing groove 33 communicating with the mounting groove 32 is formed in the other side surface of the support 30, and one end of the battery cell 31 is accommodated in the fixing groove 33. The welding portion 20 abuts against the corresponding battery cell 31 from the corresponding fixing groove 33.

Referring to fig. 7 and 9, the connecting sheet body 10 is disposed on the bracket 30, the welding portion 20 is disposed between the battery cell 31 and the connecting sheet body 10, and the elastic bending portion 23 with elastic restoring force is used to connect the welding portion 20 and the connecting sheet body 10, so that the spatial position of the welding portion 20 can be adjusted by the appropriate elastic deformation stroke of the elastic bending portion 23, the welding portion 20 and the battery cell 31 can always be in sufficient contact during welding, and the welding bump 21 is protruded on the welding portion 20, thereby improving the welding reliability of the welding portion 20 and the battery cell 31, and being applicable to welding the electrical connection sheet 100 with large thickness, and having good welding effect.

The above are merely alternative embodiments of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. An electrical connection sheet, characterized by comprising:

the connecting piece body is provided with a welding port;

2. An electrical connection sheet according to claim 1, wherein: the welding openings and the number of the welding elastic sheets are multiple, the welding openings are arranged at intervals, and each welding opening is correspondingly provided with at least one welding elastic sheet.

3. An electrical connection sheet according to claim 2, wherein: each welding port is correspondingly provided with two welding elastic sheets, one ends of elastic bending parts of the two welding elastic sheets are respectively connected with the connecting piece bodies on the two opposite sides of the welding port, the intervals between the welding parts of the two welding elastic sheets are opposite, and the welding parts are located on the same side of the connecting piece body.

4. An electrical connection sheet according to claim 3, wherein: the number of the welding bumps is at least two, and the welding bumps are arranged at intervals;

5. An electrical connection sheet according to claim 1, wherein: one end of the elastic bending part is connected with the connecting piece body at the welding port, and the other end of the elastic bending part extends towards the direction deviating from the welding port in an inclined mode and is connected with the welding part.

6. An electrical connection sheet according to claim 5, wherein: the orthographic projection of the welding elastic sheet on the connecting sheet body is located in the welding port.

7. An electrical connection sheet according to claim 1, wherein: the connecting sheet body is provided with a plurality of positioning holes which are arranged at intervals and are used for being matched with positioning columns on the battery shell so as to realize the positioning of the connecting sheet body;

or, an avoiding hole is formed in the connecting piece body and used for avoiding a connecting column on the battery pack shell.

8. An electrical connection sheet according to any one of claims 1 to 7, wherein: the connecting piece body is provided with a circuit board connecting piece, and the free end of the circuit board connecting piece is of a split structure.

9. An electrical connection sheet according to claim 8, wherein: the circuit board connecting piece comprises a power output piece, and the power output piece is used for being connected with the circuit board to output current; and/or

The circuit board connecting piece comprises a voltage acquisition piece, and the voltage acquisition piece is used for being connected with the circuit board to output the voltage of the battery cell.

10. A battery pack, comprising the electrical connection sheet according to any one of claims 1 to 9, a support, and a battery cell disposed in the support, wherein the electrical connection sheet is mounted on the support, and a welding portion of the electrical connection sheet is welded to the battery cell.