CN219717109U

CN219717109U - Bottom bracket assembly and battery

Info

Publication number: CN219717109U
Application number: CN202321128637.XU
Authority: CN
Inventors: 邹武元
Original assignee: Jiangsu Zenergy Battery Technologies Co Ltd
Current assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Priority date: 2023-05-11
Filing date: 2023-05-11
Publication date: 2023-09-19
Anticipated expiration: 2033-05-11

Abstract

The utility model relates to a bottom support assembly and a battery, wherein the bottom support assembly is arranged in a shell of the battery and comprises an insulating film, wherein the insulating film comprises a bottom film, the bottom film is provided with an opening area, and a plurality of second through holes are arranged in the opening area; the bottom film is provided with a first side and a second side which is away from the first side in the thickness direction; a second constraint part arranged on a second side of the bottom film; a first bottom plate arranged on a first side of the bottom film; the first bottom supporting plate is provided with a first through hole communicated with the second through hole; a first restriction portion having a first end and a second end disposed opposite to each other in a thickness direction of the base film; the first end of the first constraint part is fixedly connected with the first bottom supporting plate; the second end of the first constraint part is fixedly connected with the second constraint part, and the bottom film is limited between the first supporting plate and the second constraint part. The collet assembly provided by the utility model can effectively protect the battery core.

Description

Bottom bracket assembly and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a base assembly and a battery.

Background

In square lithium ion batteries, a bottom plate is typically provided at the bottom of the battery to prevent the bottom of the jellyroll from contacting the housing to conduct electricity and break the battery.

The existing insulating film and the bottom support sheet are formed as follows: the bottom support sheet is thermally fused outside the bottom film of the insulating film, however, the thermal fusion temperature is higher, the insulating film of the bare cell is easy to scald in the thermal fusion process, the cell is damaged, the protrusion after thermal fusion possibly penetrates into the cell, the pole piece is caused to fall powder and even puncture the insulating film, and great safety risks exist.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model discloses a shoe assembly and a battery.

The technical scheme adopted by the utility model is as follows:

a shoe assembly mounted within a housing of a battery, comprising:

the insulating film comprises a bottom film, wherein the bottom film is provided with an opening area, and a plurality of second through holes are arranged in the opening area; the bottom film is provided with a first side and a second side which is away from the first side in the thickness direction;

a second constraint part provided on a second side of the base film;

a first bottom plate provided on a first side of the base film; the first bottom supporting plate is provided with a first through hole communicated with the second through hole;

a first restriction portion having a first end and a second end disposed opposite to each other in the thickness direction of the base film; the first end of the first constraint part is fixedly connected with the first bottom supporting plate; the second end of the first constraint part is fixedly connected with the second constraint part, and the bottom film is limited between the first supporting plate and the second constraint part.

In some embodiments, the base film is provided with a mounting hole through which the second end of the first constraint portion passes.

In some embodiments, the first restraint and the first floor plate are integrally formed.

In some embodiments, the battery further comprises a second bottom plate for contacting an inner bottom surface of the housing of the battery, the second bottom plate being fixedly attached to the second constraint; and a channel for facilitating the electrolyte to flow to the second through hole is formed between the second bottom supporting plate and the bottom film.

In some embodiments, the second restraint and the second floor plate are integrally formed.

In some embodiments, the second constraint part is fixedly connected with the first constraint part in a clamping manner.

In some embodiments, the first restraint comprises at least one resilient arm, one end of the resilient arm being fixedly attached to the first floor plate; the other end of the elastic arm is provided with a hook part; the second constraint part comprises a connecting plate, and a bayonet which is clamped with the hook part is arranged on the connecting plate.

In some embodiments, the second constraint part further includes two support plates disposed opposite to each other, the two support plates are connected by a connection plate, and the two support plates and the connection plate enclose a receiving space for receiving the hook part.

In some embodiments, the second constraining portions are provided with four, the four second constraining portions are connected together by a second bottom plate, and the four second constraining portions are located at four corners of the second bottom plate, respectively; a first channel and a second channel are formed between the second bottom supporting plate and the bottom film, wherein the first channel is used for facilitating the electrolyte to circulate to the second through hole along the width direction of the bottom film; the second channel is used for facilitating the electrolyte to flow to the second through hole along the length direction of the bottom film.

A battery, comprising:

a housing;

a battery cell; and

the above-mentioned collet assembly, the electric core and the collet assembly are all disposed in the housing, and the insulating film coats the electric core, and the second end of the first constraint portion and/or the second constraint portion contact with the inner bottom surface of the housing.

Compared with the prior art, the technical scheme of the utility model has the following advantages:

1. according to the collet assembly, a hot melting process is omitted in a mode that the bottom film of the insulating film is limited between the first bottom plate and the second constraint part, and connection is rapid.

2. According to the bottom support assembly, the channel for facilitating the electrolyte to flow to the second through hole is formed between the second bottom support plate and the bottom film, so that the infiltration effect of the electrolyte on the battery core is ensured, foreign matters such as burrs and the like in the battery core can be prevented from contacting the battery core and the shell, the battery core is effectively protected, and the safety risk is reduced.

Drawings

In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings.

FIG. 1 is one of the schematic views of a first cross section of the shoe assembly of the present utility model.

FIG. 2 is one of the schematic views of a second cross-section of the shoe assembly of the present utility model.

FIG. 3 is a second schematic view of a first cross section of the shoe assembly of the present utility model.

FIG. 4 is a second schematic view of a second cross section of the shoe assembly of the present utility model.

Fig. 5 is a schematic view of the structure of the first bottom plate in the present utility model.

Fig. 6 is an enlarged schematic view at a in fig. 5.

Fig. 7 is a schematic view of the structure of the second bottom plate in the present utility model.

Fig. 8 is an expanded schematic view of an insulating film in the present utility model.

Description of the specification reference numerals:

1. a first bottom plate; 11. a first constraint part; 111. an elastic arm; 112. a hook part; 12. a first through hole; 21. a second constraint part; 211. a bayonet; 22. a second bottom plate; 3. an insulating film; 31. a mounting hole; 32. a second through hole; 33. a base film; 34. a first side film; 35. a second side film; 4. a first channel; 5. and a second channel.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the utility model and practice it.

The foregoing and other features, aspects and advantages of the present utility model will become more apparent from the following detailed description of the embodiments, read in conjunction with the accompanying drawings. The directional terms mentioned in the following embodiments are, for example: upper, lower, left, right, front or rear, etc., are merely references to the directions of the drawings. Thus, directional terminology is used for the purpose of illustration and is not intended to be limiting of the utility model, and furthermore, like reference numerals refer to like elements throughout the embodiments.

The research shows that the prior insulating film and the bottom support sheet are molded in a hot melting mode, but the hot melting temperature is higher, the insulating film of the bare cell is easy to scald in the hot melting process, the cell is damaged, the protrusion after the hot melting possibly penetrates into the cell, the pole piece is caused to fall powder and even puncture the insulating film, and the greater safety risk exists.

In order to solve the problems, the utility model provides a collet assembly and a battery, which solve the problem of safety of a battery core caused by the fact that a collet sheet is thermally fused outside a bottom film of an insulating film.

Example 1:

referring to fig. 1 to 3, a shoe assembly is installed in a case of a battery, and includes an insulating film 3, a second restraining part 21, a first shoe plate 1, and a first restraining part 11.

Wherein the insulating film 3 comprises a base film 33, the base film 33 is provided with an open area, and a plurality of second through holes 32 are arranged in the open area; the base film 33 has a first side and a second side facing away from the first side in the thickness direction thereof;

the second constraint part 21 is provided on the second side of the base film 33;

the first bottom plate 1 is arranged on the first side of the bottom film 33; the first bottom supporting plate 1 is provided with a first through hole 12 communicated with the second through hole 32;

the first constraint part 11 has a first end and a second end which are disposed opposite to each other in the thickness direction of the base film 33; the first end of the first restraint part 11 is fixedly connected with the first bottom supporting plate 1; the second end of the first restriction portion 11 and the second restriction portion 21 are fixedly connected, and the base film 33 is restricted between the first base plate 1 and the second restriction portion 21.

In the utility model, the bottom film 33 is limited between the first bottom plate 1 and the second constraint part 21 by the way of fixedly connecting the first constraint part 11 and the second constraint part 21 of the first bottom plate 1, so that the process of hot-melting connection of the first bottom plate 1 and the second constraint part 21 can be omitted, and further, the isolation film of a bare cell and the penetration of a protrusion after hot melting into the cell caused by hot-melting connection can be avoided. Of course, there are various fastening methods for the first restraint portion 11 and the second restraint portion 21, and the fastening methods may be screw connection or clamping connection.

In some embodiments, the base film 33 is provided with a mounting hole 31 through which the second end of the first constraint part 11 passes, specifically, the mounting hole 31 penetrates the insulating film 3, and the second end of the first constraint part 11 is fixedly connected with the second constraint part 21 after passing through the mounting hole 31.

In some embodiments, referring to fig. 5 and 6, in this embodiment, the second constraint part 21 is fixedly connected to the first constraint part 11 by means of a clamping connection.

Specifically, the first restraint portion 11 is a buckle integrated with the first bottom plate 1, or the first restraint portion 11 is a buckle separately provided from the first bottom plate 1. Wherein, the buckle is integrated in the first bottom supporting plate 1 and means that the buckle and the first bottom supporting plate 1 are integrally formed by adopting an injection molding process, the integral forming time can be greatly shortened, no splice point or splice gap exists between the buckle and the first bottom supporting plate 1, namely, no weak point exists, and the hardness and the strength of the structure are improved. The fact that the buckle is separated from the first bottom supporting plate 1 means that the buckle can be connected with the first bottom supporting plate 1 in an adhesive or welding mode, and compared with the fact that the buckle is integrally formed, the buckle and the first bottom supporting plate 1 are separated, and the service life of the buckle is short.

Specifically, the first restraint portion 11 includes at least one elastic arm 111, and one end of the elastic arm 111 is fixedly connected to the first bottom bracket plate 1; the other end of the elastic arm 111 is provided with a hook 112; the second constraint portion 21 includes a connection plate, and a bayonet 211 that is clamped with the hook portion 112 is provided on the connection plate. In particular, in the present embodiment, two elastic arms 111 are provided, and a gap exists between the two elastic arms 111.

In some embodiments, the second constraint part 21 further includes two support plates disposed opposite to each other, the two support plates are connected by a connecting plate, the two support plates and the connecting plate enclose a receiving space for receiving the hook part 112, and the support plate of the second constraint part 21 contacts with the inner bottom surface of the housing.

In some embodiments, to avoid contact of foreign objects such as burrs and the like inside the battery cells with the battery cells and the housing, the shoe assembly further includes a second shoe plate 22 for contact with the inner bottom surface of the housing of the battery, the second shoe plate 22 being fixedly connected with the second restraint 21; a passage for facilitating the flow of the electrolyte to the second through-holes 32 is formed between the second base plate 22 and the base film 33.

Specifically, the second restraint portion 21 and the second bottom plate 22 are integrally formed. Wherein, integrated into one piece means that second restraint portion 21 and second collet 22 adopt injection molding technology integrated into one piece, and integrated into one piece can shorten the shaping time greatly, does not have splice point or splice gap between second restraint portion 21 and the second collet 22 promptly, does not have the weak point, has promoted the hardness and the intensity of structure.

In the embodiment, the second constraint parts 21 comprise two support plates and connecting plates for connecting the two support plates, which are oppositely arranged, the second constraint parts 21 are provided with four, the four second constraint parts 21 are connected together through the second bottom support plates 22, and the four second constraint parts 21 are respectively positioned at the four corners of the second bottom support plates 22; a first channel 4 and a second channel 5 are formed between the second bottom plate 22 and the bottom film 33, wherein the first channel 4 is used for facilitating the electrolyte to flow to the second through holes 32 along the width direction of the bottom film 33; the second channel 5 is used to facilitate the flow of electrolyte through the second through hole 32 along the length of the carrier film 33.

In the present embodiment, as shown in fig. 8, the insulating film 3 includes a base film 33, the base film 33 is sandwiched between the first base plate 1 and the second base plate 22, and the base film 33 is provided with a plurality of second through holes 32; side films are provided along both sides of the width direction of the base film 33. Wherein, for convenience of description, the side films on both sides are defined as a first side film 34 and a second side film 35, the first side film 34 and the second side film 35 are used for wrapping the side surfaces of the cell in the thickness direction, and the bottom film 33 is used for wrapping the bottom surface of the cell.

The diameters of the plurality of second through holes 32 may be the same as shown in fig. 2 or different, and the plurality of second through holes 32 may be arranged in an mxn matrix, where M is greater than or equal to 1 and N is greater than or equal to 1, and of course, the plurality of second through holes 32 may be arranged randomly, so long as a circulation channel of the electrolyte can be formed between the insulating film 3 and the first base plate 1.

A battery, comprising:

a housing;

a battery cell; and

the shoe assembly according to embodiment 1 or embodiment 2, the battery cell and the shoe assembly are both disposed in the housing, and the insulating film 3 covers the battery cell, and the second end of the first restraint portion 11 and/or the second restraint portion 21 are in contact with the inner bottom surface of the housing.

When the height of the first constraint part 11 is greater than the height of the second constraint part 21, the second end of the first constraint part 11 contacts the inner bottom surface of the housing; when the height of the first restriction portion 11 is smaller than the height of the second restriction portion 21, the second restriction portion 21 is in contact with the inner bottom surface of the housing; when the height of the first restriction portion 11 is equal to the height of the second restriction portion 21, the second end of the first restriction portion 11 and the second restriction portion 21 are in contact with the inner bottom surface of the housing.

In this embodiment, the housing is an exterior housing containing the battery cells, and is made of a material (such as an aluminum alloy) having a certain hardness and strength. And may be various, such as copper, iron, aluminum, stainless steel, etc., to which the present embodiment is not particularly limited.

In this embodiment, the battery cell may be formed by a lamination process or a winding process, where the lamination process is to cut the positive and negative electrode plates into the required size, and then stack the positive electrode plate, the separator, and the negative electrode plate into a small battery cell unit; the winding process is to wind and extrude the separated positive pole piece, diaphragm and negative pole piece into a cylinder or elliptic cylinder or square shape according to the sequence by fixing the winding needle, then put the cylindrical or elliptic cylinder or square shape into a square shell or a cylindrical metal shell, and the parameters of the pole piece, such as the size, the winding number and the like are determined according to the design capacity of the battery.

The battery provided by the embodiment can be applied to electric equipment, wherein the electric equipment can be an automobile, a mobile phone, portable equipment, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The automobile can be a fuel oil automobile, a fuel gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range-extended automobile and the like; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the utility model does not limit the electric equipment in particular.

In the description of the embodiments of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present utility model will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present utility model.

Claims

1. A collet assembly, installed in the housing of a battery, characterized in that: comprising the following steps:

an insulating film (3) comprising a base film (33), the base film (33) being provided with an open area in which a plurality of second through holes (32) are arranged; the base film (33) has a first side and a second side facing away from the first side in the thickness direction thereof;

a second constraint part (21) provided on a second side of the base film (33);

a first bottom plate (1) provided on a first side of the bottom film (33); the first bottom support plate (1) is provided with a first through hole (12) communicated with the second through hole (32);

a first restraint portion (11) having a first end and a second end that are disposed opposite to each other in the thickness direction of the base film (33); the first end of the first constraint part (11) is fixedly connected with the first bottom supporting plate (1); the second end of the first restraint part (11) is fixedly connected with the second restraint part (21), and the bottom film (33) is limited between the first bottom supporting plate (1) and the second restraint part (21).

2. The shoe assembly of claim 1, wherein: the base film (33) is provided with a mounting hole (31) through which the second end of the first constraint part (11) passes.

3. The shoe assembly of claim 1, wherein: the first restraint part (11) and the first bottom supporting plate (1) are integrally formed.

4. The shoe assembly of claim 1, wherein: the battery also comprises a second bottom support plate (22) used for contacting with the inner bottom surface of the battery shell, and the second bottom support plate (22) is fixedly connected with the second constraint part (21); a channel for facilitating the circulation of electrolyte to the second through hole (32) is formed between the second bottom support plate (22) and the bottom film (33).

5. The shoe assembly of claim 4, wherein: the second restraint part (21) and the second bottom supporting plate (22) are integrally formed.

6. The shoe assembly of claim 1, wherein: the second constraint part (21) is fixedly connected with the first constraint part (11) in a clamping manner.

7. The shoe assembly of claim 6, wherein: the first restraint part (11) comprises at least one elastic arm (111), and one end of the elastic arm (111) is fixedly connected with the first bottom supporting plate (1); the other end of the elastic arm (111) is provided with a hook part (112); the second constraint part (21) comprises a connecting plate, and a bayonet (211) clamped with the hook part (112) is arranged on the connecting plate.

8. The shoe assembly of claim 7, wherein: the second constraint part (21) further comprises two supporting plates which are oppositely arranged, the two supporting plates are connected through the connecting plate, and the two supporting plates and the connecting plate enclose a containing space for containing the hook part (112).

9. The shoe assembly of claim 1, wherein: the second restraint parts (21) are provided with four, the four second restraint parts (21) are connected together through a second bottom support plate (22), and the four second restraint parts (21) are respectively positioned at four corners of the second bottom support plate (22); a first channel (4) and a second channel (5) are formed between the second bottom plate (22) and the bottom film (33), wherein the first channel (4) is used for facilitating the electrolyte to flow to the second through hole (32) along the width direction of the bottom film (33); the second channel (5) is used for facilitating the electrolyte to flow to the second through hole (32) along the length direction of the bottom film (33).

10. A battery, characterized in that: comprising the following steps:

a housing;

a battery cell; and

the shoe assembly of any one of claims 1-9, wherein the battery cell and the shoe assembly are both arranged in the shell, the insulating film (3) covers the battery cell, and the second end of the first restraint part (11) and/or the second restraint part (21) are/is contacted with the inner bottom surface of the shell.