CN115241610A

CN115241610A - Current collecting component, battery unit and electronic equipment

Info

Publication number: CN115241610A
Application number: CN202210557197.3A
Authority: CN
Inventors: 车佩佩
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2022-05-20
Filing date: 2022-05-20
Publication date: 2022-10-25

Abstract

The invention belongs to the technical field of secondary batteries, and discloses a current collecting component, a battery unit and electronic equipment. The current collecting component comprises a main structure and a leading-out structure, at least one group of windows are formed in the main structure, at least one blade is connected to each window, and one end, far away from the electrode assembly, of each lug penetrates out of each window to be connected with the corresponding blade. Compared with the traditional mode that the tab part is connected with the wing structures at two sides after winding the width direction of the main body structure, the tab part directly penetrates through the window to be connected with the blade and is not connected with the blade after winding the width direction of the main body structure, the total size of the tab part and the main body structure in the width direction is reduced, the energy density of a battery is favorably improved, the length of the tab part can be reduced, and the use of tab materials is favorably reduced.

Description

Current collecting component, battery unit and electronic equipment

Technical Field

The present invention relates to the field of secondary battery technologies, and in particular, to a current collecting member, a battery unit, and an electronic device.

Background

With the increasing development of electric automobiles, higher requirements are placed on the performance of lithium ion core components for providing energy for the electric automobiles. The electrode assembly needs to uniformly output current through the current collecting member. The two sides of the main body of the current collecting component are provided with wing structures which are connected with the pole ear parts and can be bent outwards, after the pole ear parts are connected with the wing structures, the pole ear parts are bent towards the direction away from the electrode assembly together, so that the occupied space after bending is large, and the overall size of the current collecting component and the pole ear parts is increased, so that the overall size is enlarged, and the improvement of the energy density of the battery is not facilitated.

Disclosure of Invention

The invention aims to provide a current collecting component, a battery unit and electronic equipment, which can reduce the occupation of space size of the current collecting component and a tab part, is beneficial to improving the energy density of a battery, reduces the tab material and reduces the cost.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the current collecting member includes a main structure and a lead-out structure for leading out current, the main structure is disposed at one end of the electrode assembly in the length direction, the main structure is parallel or substantially parallel to the side surface of the electrode assembly and extends in the width direction of the electrode assembly, the main structure is perpendicular or substantially perpendicular to the lead-out structure in the direction away from the cover plate assembly, at least one set of windows are disposed on the main structure, at least one blade is connected to the windows, and one end of a tab portion away from the electrode assembly penetrates through the windows and is connected to the blade.

Optionally, the blade can drive the pole ear portion to bend towards the direction close to the window and at least partially cover the window. Blade and utmost point ear portion turn over the book towards being close to electrode subassembly direction, compare in prior art and buckle towards keeping away from electrode subassembly direction and compare, the blade after buckling and the holistic thickness size reduction of utmost point ear portion do benefit to the energy density who promotes the battery, and the major structure of switching piece is through windowing the design, only turns over the blade of book window department during the use, and the major structure of switching piece bears the moment of torsion less, and major structure intensity has obtained the promotion.

Optionally, two sets of the windows are formed in the main body structure, the two sets of the windows are arranged at intervals in the width direction of the main body structure, and the tab portions of the two sets of the electrode assemblies correspondingly penetrate through the two sets of the windows and are correspondingly connected with the blades on the two sets of the windows respectively. The pole ear parts at the ends of the two groups of electrode assemblies in the same direction share one adapter piece for concentrated output, so that the number of the adapter pieces is reduced, and the density of the battery is further improved.

Optionally, one end of the main body structure, which is far away from the guiding structure, is provided with a fixing structure, the fixing structure comprises a bending part, and the fixing tool can be clamped with the bending part to position the main body structure. The fixing structure can be assembled with the fixing tool, when the blade is bent, the fixing tool can play a role in fixing the main body structure, the main body structure is prevented from deflecting, the bending part can be inserted into the groove structure of the fixing tool, and the fixing tool is connected with the main body structure in a rapid positioning mode.

Optionally, the tab portion includes a first tab piece and a second tab piece arranged at an interval, each group of the tabs is rotatably connected with two of the blades, and the first tab piece and the second tab piece are connected with the two of the blades in a one-to-one correspondence manner. Two formula utmost point ears are compared traditional one-piece formula utmost point ear, and it is more convenient to buckle, has promoted utmost point ear quality of buckling, when making things convenient for utmost point ear to buckle, does benefit to the consumption that reduces utmost point ear material, saves the cost.

Optionally, the blade thickness dimension is less than or equal to the thickness dimension of the body structure. The thickness of the blade is preferably smaller than the thickness of the main structure, so that the thickness of the blade and the tab after being bent can be further reduced.

Optionally, the width dimension of the window is 1/10-1/2 of the width dimension of the main body structure; the length dimension of the window is 1/10-1/2 of the length dimension of the main body structure, so that the main body structure can maintain the optimal structural strength.

Optionally, the major structure with blade integrated into one piece, convenient batch production does benefit to and promotes production efficiency.

In a second aspect, a battery cell is provided, which includes an electrode assembly, a cover plate assembly and the current collecting member, wherein the electrode assembly includes a tab portion, the tab portion is connected to the blade, the cover plate assembly is located on the top surface of the electrode assembly, the cover plate assembly includes a post, and the guiding structure is connected to the post.

In a third aspect, an electronic device is provided, which includes the battery unit.

The invention has the beneficial effects that:

compared with the traditional mode that the lug part is connected with the blade after being wound around the width direction of the main body structure, the lug part directly penetrates through the window to be connected with the blade and is not connected with the blade after being wound around the width direction of the main body structure, so that the total size of the lug part and the main body structure in the width direction is reduced, the energy density of a battery is favorably improved, the length of the lug part can be reduced, and the use of lug materials is favorably reduced.

The current collecting component is used in the battery unit, the structural strength of the current collecting component is high, the space occupation ratio is small, the energy density of the battery unit is effectively improved, and the performance of the battery unit is improved.

The electronic equipment uses the battery unit, and has high energy density, strong performance and good cruising effect.

Drawings

Fig. 1 is a schematic structural view of a current collecting member according to an embodiment of the present invention;

fig. 2 is a front view of a current collecting member according to an embodiment of the present invention;

fig. 3 is a right side view of a current collecting member according to an embodiment of the present invention;

fig. 4 is a schematic connection diagram of a current collecting member and a fixing tool according to an embodiment of the present invention;

FIG. 5 is an enlarged partial view of FIG. 4 at A;

fig. 6 is a front view of the connection of the current collecting member with the electrode assembly, the cap plate assembly and the fixing tool (the current collecting member blade is not bent);

fig. 7 is a bottom view of the connection of the current collecting member with the electrode assembly, the cap plate assembly and the fixing tool (the current collecting member blade is not bent);

fig. 8 is a side view of the connection of the current collecting member with the electrode assembly, the cap plate assembly and the fixing tool (the current collecting member blades are not bent);

fig. 9 is a front view of the connection of the current collecting member with the electrode assembly, the cap plate assembly and the fixing tool (the current collecting member blade has been bent);

fig. 10 is a side view of the connection of the current collecting member with the electrode assembly, the cap plate assembly, and the fixing tool (the current collecting member blade has been bent).

In the figure:

1. a body structure; 11. a window; 111. a blade;

2. exporting the structure;

3. a holding structure; 31. a bending part;

100. an electrode assembly; 101. an electrode assembly side; 102. a pole ear portion; 1021. a first pole ear piece; 1022. A second pole ear piece; 103. fixing the tool; 104. a cover plate assembly; 105. and (4) a pole.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar parts throughout or parts having the same or similar functions. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, unless otherwise specifically stated or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and may include, for example, fixed or detachable connections, mechanical or electrical connections, direct or indirect connections via intermediate media, communication between two elements, or the interaction between two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the description of the present invention, unless otherwise explicitly specified or limited, the first feature "on" or "under" the second feature may include the first feature and the second feature being in direct contact, and may also include the first feature and the second feature not being in direct contact but being in contact via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used based on the orientations or positional relationships shown in the drawings for convenience of description and simplicity of operation, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The electronic device of the present application is not particularly limited, and may be any electronic device known in the art. In some embodiments, the electronic device may include, but is not limited to, a notebook computer, a pen-input computer, a mobile computer, an electronic book player, a portable phone, a portable facsimile machine, a portable copier, a portable printer, a headphone, a video recorder, a liquid crystal television, a handheld cleaner, a portable CD player, a mini-disc, a transceiver, an electronic organizer, a calculator, a memory card, a portable recorder, a radio, a backup power source, an electric motor, an automobile, a motorcycle, a power-assisted bicycle, a lighting fixture, a toy, a game machine, a clock, an electric tool, a flashlight, a camera, a large household battery, a lithium ion capacitor, and the like.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

The invention provides a current collecting member, which comprises a main body structure 1 and a lead-out structure 2 for leading out current, wherein the main body structure 1 is arranged at one end of an electrode assembly 100 in the length direction, the main body structure 1 is parallel or approximately parallel to an electrode assembly side surface 101 and extends along the width direction of the electrode assembly 100, and the main body structure 1 is vertically or approximately vertically arranged relative to the lead-out structure 2 in the direction away from a cover plate assembly 104. At least one group of windows 11 are formed in the main body structure 1, at least one blade 111 is connected to the window 11, and one end of the tab portion 102 away from the electrode assembly 100 penetrates through the window 11 and is connected to the blade 111.

In this embodiment, reference may be made to fig. 6 for a schematic connection diagram of the current collecting member and the electrode assembly 100, where the electrode assembly 100 is a flat-long rectangular battery cell, and a length direction and a width direction of the electrode assembly 100 in fig. 6 are indicated by coordinate system in fig. 6. The main structure 1 of the current collecting member is disposed at one end of the electrode assembly 100 in the length direction, and is parallel or substantially parallel to the electrode assembly side 101, the lead-out structure 2 is connected to the cap plate assembly 104, and the main structure 1 is bent with respect to the lead-out structure 2 in a direction away from the cap plate assembly 104, and extends in the width direction of the electrode assembly 100. The tab portion 102 led out from one end of the electrode assembly 100 in the length direction penetrates through the window 11 to be connected with the blade 111, the tab portion 102 directly penetrates through the window 11 to be connected with the blade 111, and is not connected with the blade 111 in the width direction of the main structure 1, so that the total size of the tab portion 102 in the width direction of the main structure 1 is reduced, the energy density of a battery is favorably improved, the length of the tab portion 102 can be reduced, and the use of tab materials is favorably reduced.

Optionally, the blade 111 can bend the tab portion 102 toward the window 11 and at least partially cover the window 11. In this embodiment, in addition to the above-mentioned manner of directly connecting the lug portion 102 with the blade 111 through the window 11, after the tab portion 102 is connected with the blade 111, the blade 111 may be bent, as shown in fig. 9 and 10, so that the blade 111 and the lug portion 102 thereon are bent toward the window 11 and at least partially cover the window 11. Compared with the wing structure which is turned outwards in the prior art, the thickness of the whole bent blade 111 and the lug part 102 is reduced, the energy density of the battery is improved, the main structure 1 of the current collecting component is designed by opening the window, only the blade 111 at the window 11 is turned over when the current collecting component is used, the main structure 1 of the current collecting component bears smaller torque, and the strength of the main structure 1 is improved.

Optionally, two sets of windows 11 are formed in the main body structure 1, the two sets of windows 11 are disposed at intervals along the width direction of the main body structure 1, and the tab portions 102 of the two sets of electrode assemblies 100 correspondingly penetrate through the two sets of windows 11 and are respectively and correspondingly connected to the blades 111 on the two sets of windows 11.

In the present embodiment, as shown in fig. 1 to fig. 3, two sets of rectangular windows 11 are opened on the main body structure 1 in the present embodiment, two sets of electrode assemblies 100 are also correspondingly provided, as shown in fig. 6 and fig. 7, the two sets of electrode assemblies 100 are arranged in the same column, the tab portions 102 of each set of electrode assemblies 100 correspondingly penetrate through one set of windows 11 and are correspondingly connected with the blades 111 at the windows 11, in the present embodiment, the tab portions 102 at the ends of the two sets of electrode assemblies 100 in the same direction share one adapter for concentrated output, so that the number of adapters is reduced, and the battery density is further improved. Besides, as shown in fig. 6 of this embodiment, only one set of electrode assemblies 100 may be provided, only one set of windows 11 is also provided on the main structure 1, and the tab portions 102 at one end of one set of electrode assemblies 100 are collectively output through one adaptor, which is not limited to the connection manner of the two sets of electrode assemblies 100 shown in fig. 6 and 7 of this embodiment.

Further, the tab part 102 includes a first tab piece 1021 and a second tab piece 1022 which are arranged at intervals, two blades 111 are rotatably connected to each group of windows 11, and the first tab piece 1021 and the second tab piece 1022 are connected to the two blades 111 in a one-to-one correspondence.

In the present embodiment, as shown in fig. 6 and 8, the tab part 102 at one end of each set of electrode assemblies 100 is divided into two separate pieces, i.e., a first tab piece 1021 and a second tab piece 1022, and the number of the blades 111 at the window 11 is also set to two, and the two separate pieces are connected to the first tab piece 1021 and the second tab piece 1022, respectively. It can be understood that compare with the utmost point ear portion 102 of a slice formula, this embodiment divides into first utmost point ear piece 1021 and second utmost point ear piece 1022 two parts with utmost point ear portion 102, and two slice formula utmost point ears are traditional one-slice formula utmost point ear relatively, and it is more convenient to buckle, has promoted utmost point ear and has buckled the quality, when making things convenient for utmost point ear to buckle, does benefit to the consumption that reduces utmost point ear material, saves the cost.

Optionally, the end of the main body structure 1 away from the leading-out structure 2 is provided with a holding structure 3.

In this embodiment, as shown in fig. 4 and 5, a holding structure 3 is disposed at an end of the main body structure 1 away from the guiding structure 2, the holding structure 3 can be assembled with the fixing tool 103, and when the blade 111 is bent, the fixing tool 103 can play a role of fixing the main body structure 1, so as to prevent the main body structure 1 from deflecting.

Specifically, the fixing structure 3 includes a bending portion 31, and the fixing tool 103 can be clamped with the bending portion 31 to position the main body structure 1. As shown in fig. 4 and 5, the fixing structure 3 in this embodiment includes a bending portion 31, a groove structure is disposed on the fixing tool 103, and the bending portion 31 can be inserted into the groove structure of the fixing tool 103, so as to achieve the quick positioning connection between the fixing tool 103 and the main structure 1. In addition, the fixing tool 103 and the holding structure 3 may be connected in other types, which is not limited to this embodiment.

Optionally, the thickness dimension of the blade 111 is smaller than or equal to the thickness dimension of the main structure 1. Preferably, the blade 111 is thinned so that the thickness dimension of the blade 111 is smaller than that of the main structure 1. It can be understood that after the blade 111 is connected to the blade 103, the blade 111 is bent and restored to drive the blade 103 to bend toward the direction close to the window 11, and after the blade 111 is bent, the tab 103 is partially stacked, so that the blade 111 is thinned, and the thickness of the blade 111 and the blade 102 after being bent is further reduced.

Optionally, the width dimension of the window 11 is 1/10-1/2 of the width dimension of the main body structure 1; the length dimension of the window 11 is 1/10-1/2 of the length dimension of the main body structure 1, and the above dimension range is the optimal dimension range of the width dimension and the length dimension of the window 11, and the structural strength of the main body structure 1 is not influenced.

Optionally, the body structure 1 is integrally formed with the blade 111. Blade 111 in this embodiment forms with major structure 1 integrated into one piece, and convenient batch production does benefit to and promotes production efficiency.

The invention also discloses a battery unit, as shown in fig. 6-10, comprising an electrode assembly 100, a cover plate assembly 104 and the current collecting member, wherein the electrode assembly 100 comprises a pole ear part 102, the pole ear part 102 is correspondingly connected with a blade 111, the cover plate assembly 104 is positioned on the top surface of the electrode assembly 100, the cover plate assembly 104 comprises a pole 105, and the leading-out structure 2 is connected with the pole 105.

The electrode assembly 100 is a flat-long rectangular electric core, and is provided with two groups, the two groups of electrode assemblies 100 are oppositely arranged, the two groups of current collecting members are correspondingly provided, and are respectively arranged at two ends of the two groups of electrode assemblies 100 in the length direction, and the main structures 1 of the two groups of current collecting members are respectively parallel or approximately parallel to the two electrode assembly sides 101, the lead-out structure 2 is correspondingly connected with the pole posts 105 at two ends of the cover plate assembly 104 in the length direction, the pole ear parts 102 of the two groups of electrode assemblies 100 respectively include a first pole ear part 1021 and a second pole ear part 1022, the main structure 1 of the current collecting member is correspondingly provided with two groups of windows 11 and four blades 111, the first pole ear part 1021 and the second pole ear part 1022 of each group of electrode assemblies 100 correspondingly penetrate through the window 11 to be connected with the blades 111 (as shown in fig. 6-8), after the connection is completed, the fixing tool 103 is inserted and fixed with the fixing structure 3, and the blades 111 are bent towards the direction close to the window 11 (as shown in fig. 9-10). Because the battery unit in the embodiment uses the current collecting component, the energy density of the battery unit is effectively improved, and the performance of the battery unit is improved.

In addition, the embodiment also provides an electronic device, which includes the above battery unit, and the battery unit may be provided in plurality. The electronic equipment can be a new energy automobile, and has high energy density, strong performance and good cruising effect.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A current collecting member comprises a main body structure (1) and a leading-out structure (2) used for leading out current, wherein the main body structure (1) is arranged at one end of an electrode assembly (100) in the length direction, the main body structure (1) is parallel or approximately parallel to an electrode assembly side surface (101) and extends in the width direction of the electrode assembly (100), the main body structure (1) is perpendicular or approximately perpendicular to the leading-out structure (2) in the direction away from a cover plate assembly (104), the current collecting member is characterized in that at least one group of windows (11) are formed in the main body structure (1), at least one blade (111) is connected to each window (11), and one end, away from the electrode assembly (100), of a tab portion (102) penetrates out of each window (11) and is connected with each blade (111).

2. The current collecting member according to claim 1, characterized in that the blade (111) is able to bend the lug portion (102) towards the window (11) and at least partially cover the window (11).

3. The current collecting member according to claim 1, wherein two sets of the windows (11) are formed on the main body structure (1), the two sets of the windows (11) are arranged at intervals along the width direction of the main body structure (1), and the tab portions (102) of the two sets of the electrode assemblies (100) correspondingly penetrate through the two sets of the windows (11) and are respectively correspondingly connected with the blades (111) on the two sets of the windows (11).

4. The current collecting member according to claim 1, wherein a holding structure (3) is disposed at an end of the main structure (1) away from the leading-out structure (2), the holding structure (3) includes a bent portion (31), and a fixing tool (103) can be clamped with the bent portion (31) to position the main structure (1).

5. The current collecting member according to claim 1, wherein the pole ear part (102) comprises a first pole ear piece (1021) and a second pole ear piece (1022) which are arranged at intervals, two blades (111) are rotatably connected to each group of the windows (11), and the first pole ear piece (1021) and the second pole ear piece (1022) are connected with the two blades (111) in a one-to-one correspondence.

6. Current collecting member according to any of claims 1-5, characterized in that the thickness dimension of the blade (111) is smaller than or equal to the thickness dimension of the body structure (1).

7. -current collecting member according to any of claims 1 to 5, characterized in that the width dimension of the window (11) is 1/10-1/2 of the width dimension of the host structure (1); the length dimension of the window (11) is 1/10-1/2 of the length dimension of the main body structure (1).

8. Current collecting member according to any of claims 1-5, characterized in that the body structure (1) is integrated with the blade (111).

9. A battery cell comprising an electrode assembly (100), a cover plate assembly (104) and the current collecting member according to any one of claims 1 to 8, wherein the electrode assembly (100) comprises an ear portion (102), the ear portion (102) is correspondingly connected to the blade (111), the cover plate assembly (104) is located on the top surface of the electrode assembly (100), the cover plate assembly (104) comprises a pole (105), and the lead-out structure (2) is connected to the pole (105).

10. An electronic device, characterized by comprising the battery cell of claim 9.