CN221447411U

CN221447411U - Lithium battery structure

Info

Publication number: CN221447411U
Application number: CN202323201594.6U
Authority: CN
Inventors: 曹瑞瑞; 孙珊珊; 胡江生; 周秋珊
Original assignee: Ningbo Veken Battery Co ltd
Current assignee: Ningbo Veken Battery Co ltd
Priority date: 2023-11-27
Filing date: 2023-11-27
Publication date: 2024-07-30
Anticipated expiration: 2033-11-27

Abstract

The utility model relates to the technical field of batteries and discloses a lithium battery structure, which comprises a shell, wherein the shell is provided with an accommodating groove with an opening at one side, a battery cell is arranged in the accommodating groove, an anode post and a cathode post which are adjacently arranged are arranged on the battery cell, a lug and a connecting sheet which are connected in a Z shape are respectively arranged between the battery cell and the anode post and between the battery cell and the cathode post, and the lug and the connecting sheet are in fit connection. The lithium battery structure provided by the utility model has the advantages of simple structure, small volume and high safety.

Description

Lithium battery structure

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a lithium battery structure.

Background

Lithium batteries are a type of battery using a nonaqueous electrolyte solution with lithium metal or a lithium alloy as a positive/negative electrode material. Under the wave of new energy, lithium batteries have been further developed, but the large capacity, miniaturization and safety of lithium batteries are still important points of research of various manufacturers. The current lithium battery includes the electric core and is the electrode post of other functional parts power supply, and this electric core is general to link to each other with the electrode post through utmost point ear and connection piece, however is limited by the structural limitation of utmost point ear and connection piece for the casing of current holding electric core is too big, can not satisfy the demand that the user miniaturized to the battery case.

Disclosure of utility model

The utility model aims to solve the problems in the prior art and provide a lithium battery structure with simple structure, small volume and high safety.

The lithium battery structure comprises a shell, wherein the shell is provided with an accommodating groove with an opening at one side, a battery core is arranged in the accommodating groove, an anode post and a cathode post which are adjacently arranged are arranged on the battery core, a lug and a connecting sheet which are connected in a Z shape are respectively arranged between the battery core and the anode post and between the battery core and the cathode post, and the lug and the connecting sheet are in fit connection.

In the above-mentioned lithium battery structure, the tab with the connection piece is all buckled into the V style of calligraphy, wherein, the tab includes first connection face, the connection piece includes the second connection face, just first connection face with the second connection face overlaps and the laminating is connected mutually, so that the tab with the connection piece forms folding form the Z style of calligraphy.

In the above-mentioned lithium battery structure, the tab further includes a third connection surface, where the third connection surface is disposed opposite to the first connection surface and is attached to the electrical core.

In the above-mentioned lithium battery structure, the connecting piece further includes a fourth connecting surface, where the fourth connecting surface is disposed opposite to the second connecting surface and is attached to the positive electrode post or the negative electrode post.

In the above-mentioned lithium battery structure, including set up in the apron of holding tank opening part, the apron is right the opening forms the shutoff, wherein, be provided with on the apron and supply the anodal post with the negative pole post passes first mounting groove, just be provided with the insulating part on the first mounting groove.

In the above lithium battery structure, the cover plate is provided with an explosion-proof valve, the explosion-proof valve and the cover plate are integrally formed, and the explosion-proof valve is provided with a patch.

In the above lithium battery structure, the cover plate is further provided with a liquid injection hole, and the liquid injection hole penetrates through the cover plate and is integrally formed with the cover plate.

In the above-mentioned lithium battery structure, still be provided with the baffle between the apron with the electric core, the baffle with the apron orientation electric core one side laminating is connected, just be provided with on the baffle and supply anodal post with the negative pole post both pass and this two form excessive matched second mounting groove.

In the above lithium battery structure, an isolation film is further disposed on the outer surface of the battery cell, and the isolation film wraps the other surface of the battery cell facing away from the cover plate.

In the above-mentioned lithium battery structure, a bottom support piece is further disposed between the isolation film and the inner wall of the accommodating groove, and the bottom support piece is bonded to the isolation film.

Compared with the prior art, the utility model has the beneficial effects that: through set up respectively and connect utmost point ear and the connection piece that is the zigzag between electric core and positive pole post and negative pole post to make a side of utmost point ear overlap with a side of connection piece and form the laminating and be connected, make the connection space between electric core and positive pole post and the negative pole post obtain effectual compression, reduced the interior space that electric core and positive pole post and negative pole post occupy, thereby satisfied the demand of the miniaturized design of casing.

Drawings

Fig. 1 is a schematic structural diagram of a lithium battery according to an embodiment of the utility model.

Fig. 2 is an exploded view of a lithium battery structure according to an embodiment of the present utility model.

Fig. 3 is a schematic partial structure of a lithium battery according to an embodiment of the utility model.

Fig. 4 is a cross-sectional view of a lithium battery structure according to an embodiment of the present utility model.

Fig. 5 is an enlarged view at a in fig. 4.

Like reference numerals denote like technical features throughout the drawings, in particular: 100. a housing; 110. a receiving groove; 111. an opening; 200. a battery cell; 210. a positive electrode post; 220. a negative electrode column; 300. a tab; 310. a first connection surface; 320. a third connection surface; 400. a connecting sheet; 410. a second connection surface; 420. a fourth connection surface; 500. a cover plate; 510. a first mounting groove; 511. an insulating member; 520. an explosion-proof valve; 530. a liquid injection hole; 600. a partition plate; 610. a second mounting groove; 700. a separation film; 800. a bottom bracket sheet.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

As shown in fig. 1 to 5, a lithium battery structure includes a case 100, a receiving groove 110, a battery cell 200, a positive electrode post 210, a negative electrode post 220, a tab 300, a connection piece 400, a cover plate 500, a separator 600, a separation film 700, and a bottom sheet 800.

As shown in fig. 1 to 5, a lithium battery structure comprises a casing 100, wherein the casing 100 is provided with a containing groove 110 with an opening 111 at one side, a battery cell 200 is arranged in the containing groove 110, and a positive pole 210 and a negative pole 220 which are adjacently arranged are arranged on the battery cell 200, wherein a tab 300 and a connecting sheet 400 which are connected in a Z shape are respectively arranged between the battery cell 200 and the positive pole 210 and the negative pole 220, and the tab 300 and the connecting sheet 400 are in fit connection; the connection space between the battery cell 200 and the positive electrode column 210 and the negative electrode column 220 is effectively compressed, and the internal space occupied by the battery cell 200 and the positive electrode column 210 and the negative electrode column 220 is reduced, so that the requirement of miniaturized design of the shell 100 can be met.

Specifically, as shown in fig. 1 and 2, in the present embodiment, the housing 100 is rectangular, and has a receiving groove 110 with an opening 111 at one side, the battery cell 200 is disposed in the receiving groove 110, and the size of the receiving groove 110 is adapted to the size of the battery cell 200, so as to protect the battery cell 200.

In this embodiment, a rectangular cover plate 500 is further disposed at the opening 111 of the accommodating groove 110, the size of the cover plate 500 is adapted to that of the opening 111, and the opening 111 is blocked, wherein a first mounting groove 510 for passing through the positive electrode column 210 and the negative electrode column 220 is disposed on the cover plate 500, so that the battery cell 200 is connected with the electrode column, and power supply to other functional components is realized.

Preferably, in this embodiment, the first mounting grooves 510 are arranged in pairs and respectively correspond to the positive electrode post 210 and the negative electrode post 220 one by one, wherein each first mounting groove 510 is provided with an insulating member 511, one surface of the insulating member 511 is in a rectangular ring and is in fit connection with the first mounting groove 510, and the other surface of the insulating member is in fit connection with the positive electrode post 210 or the negative electrode post 220, so that short circuit caused by the communication between the positive electrode post 210 and the negative electrode post 220 and the cover plate 500 is avoided, and the safety of the lithium battery structure is effectively improved.

To supply power to other functional components, in this embodiment, a positive electrode post 210 and a negative electrode post 220 are disposed on a side of the battery cell 200 facing the opening 111, where the positive electrode post 210 and the negative electrode post 220 pass through a first mounting slot 510 of the cover plate 500 to be communicated with the battery cell 200 through the connection piece 400 and the tab 300, so as to realize the power supply of the battery cell 200 and other functional components.

As shown in fig. 2 to 5, in order to reduce the occupation of the internal space of the housing 100, in this embodiment, the connection piece 400 and the tab 300 are connected in a zigzag manner, wherein the tab 300 and the connection piece 400 are bent into a V shape, the tab 300 includes a first connection surface 310, the connection piece 400 includes a second connection surface 410, and the first connection surface 310 and the second connection surface 410 overlap and form a connection by ultrasonic welding, so that the tab 300 and the connection piece 400 form a zigzag manner in a folded manner, and the space between the tab 300 and the connection piece 400 is compressed, thereby compressing the space occupied by connecting the battery cell 200 with the positive electrode post 210 and the negative electrode post 220, and meeting the requirement of users on the miniaturized design of the housing 100.

In this embodiment, the tab 300 further includes a third connection surface 320, where the third connection surface 320 is disposed opposite to the first connection surface 310, and is in lamination connection with the battery cell 200 in an integrally formed manner, so as to realize electrical conduction to the battery cell 200.

It should be noted that, the tab 300 is first integrally formed with the battery cell 200, and then bent in a V shape to be welded with the connecting piece 400.

In this embodiment, the connection piece 400 further includes a fourth connection surface 420, where the fourth connection surface 420 is disposed opposite to the second connection surface 410, and is in fit connection with the positive electrode post 210 or the negative electrode post 220 through laser welding, so that the electric energy of the battery cell 200 can be conducted onto the positive electrode post 210 and the negative electrode post 220, and power supply to other functional components is achieved.

In order to further improve the safety of the lithium battery structure, in this embodiment, an explosion-proof valve 520 is disposed on the cover 500, the explosion-proof valve 520 is located between the positive electrode post 210 and the negative electrode post 220, and is integrally formed with the cover 500 by stamping, and a patch (not shown in the figure) is disposed on the explosion-proof valve 520 to protect the explosion-proof valve 520 and prevent the explosion-proof valve 520 from being broken from the outside of the casing 100.

In this embodiment, the cover 500 is further provided with a liquid injection hole 530, and the liquid injection hole 530 is circular, is adjacent to the explosion-proof valve 520, penetrates through the cover 500, and is integrally formed with the cover 500, so that electrolyte is injected into the casing 100, and a lithium battery is manufactured.

In this embodiment, a partition board 600 made of an insulating material is further disposed between the cover plate 500 and the battery cell 200, the partition board 600 is attached to one side of the cover plate 500 facing the battery cell 200, and a second mounting groove 610 for passing through the positive electrode column 210 and the negative electrode column 220 and a through hole matched with the liquid injection hole 530 are disposed on the partition board 600, wherein the second mounting groove 610 and the positive electrode column 210 and the negative electrode column 220 form a transition fit, so as to fix the positive electrode column 210 and the negative electrode column 220, and also perform insulation and thermal insulation protection functions on the battery cell 200, thereby further improving the safety of the lithium battery structure.

In order to further improve the use safety of the battery cell 200, in this embodiment, the outer surface of the battery cell 200 is further provided with an isolation film 700, the isolation film 700 is a mylar film, other surfaces of the battery cell 200, which are away from the cover plate 500, are wrapped, and one end of the isolation film 700, which is close to the partition plate 600, is in lamination connection with the partition plate 600 through plastic deformation, so as to realize insulation of the battery cell 200, and avoid situations of leakage, short circuit and the like of the battery cell 200.

In this embodiment, a bottom plate 800 is further disposed between the isolation film 700 and the inner wall of the side of the accommodating groove 110 facing away from the opening 111, and the bottom plate 800 and the isolation film 700 are bonded and connected by sol to support the battery cell 200.

It should be noted that the description of the present utility model as it relates to "first", "second", "a", etc. is for descriptive purposes only and is 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 at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. The terms "coupled," "secured," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally formed, for example; the connection can be mechanical connection or electric connection; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. 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.

In addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present utility model.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Claims

1. The utility model provides a lithium battery structure, its characterized in that, includes casing (100), casing (100) have holding tank (110) of one side opening (111), electric core (200) are built-in to holding tank (110), just be provided with on electric core (200) and be positive pole post (210) and negative pole post (220) that the adjacent arrangement, wherein, electric core (200) with be provided with respectively between positive pole post (210) and negative pole post (220) and connect lug (300) and connection piece (400) that are the zigzag, just lug (300) with connection piece (400) are the laminating and are connected.

2. The lithium battery structure according to claim 1, wherein the tab (300) and the connection piece (400) are bent into a V shape, wherein the tab (300) includes a first connection surface (310), the connection piece (400) includes a second connection surface (410), and the first connection surface (310) and the second connection surface (410) overlap and are in fit connection, so that the tab (300) and the connection piece (400) form a folded zigzag shape.

3. The lithium battery structure according to claim 2, wherein the tab (300) further comprises a third connection surface (320), and the third connection surface (320) is disposed opposite to the first connection surface (310) and is in fit connection with the battery cell (200).

4. The lithium battery structure according to claim 2, wherein the connecting piece (400) further comprises a fourth connecting surface (420), and the fourth connecting surface (420) is disposed opposite to the second connecting surface (410) and is in fit connection with the positive electrode post (210) or the negative electrode post (220).

5. The lithium battery structure according to claim 1, comprising a cover plate (500) disposed at an opening (111) of the accommodating groove (110), wherein the cover plate (500) forms a seal for the opening (111), a first mounting groove (510) for passing through the positive electrode post (210) and the negative electrode post (220) is disposed on the cover plate (500), and an insulating member (511) is disposed on the first mounting groove (510).

6. The lithium battery structure according to claim 5, wherein an explosion-proof valve (520) is disposed on the cover plate (500), the explosion-proof valve (520) and the cover plate (500) are integrally formed, and a patch is disposed on the explosion-proof valve (520).

7. The lithium battery structure according to claim 5, wherein the cover plate (500) is further provided with a liquid injection hole (530), and the liquid injection hole (530) penetrates through the cover plate (500) and is integrally formed with the cover plate (500).

8. The lithium battery structure according to claim 5, wherein a separator (600) is further disposed between the cover plate (500) and the battery cell (200), the separator (600) and the cover plate (500) are attached to each other toward one side of the battery cell (200), and a second mounting groove (610) is disposed on the separator (600) for passing through and excessively matching the positive electrode column (210) and the negative electrode column (220).

9. The lithium battery structure according to claim 5, wherein an isolation film (700) is further provided on the outer surface of the battery cell (200), and the isolation film (700) wraps the other surface of the battery cell (200) facing away from the cover plate (500).

10. The lithium battery structure according to claim 9, wherein a bottom support sheet (800) is further disposed between the isolation film (700) and the inner wall of the accommodating groove (110), and the bottom support sheet (800) forms a bonding connection with the isolation film (700).