CN220290941U - Single battery and battery pack - Google Patents

Abstract

The utility model relates to the technical field of power batteries, and discloses a single battery and a battery pack, wherein the single battery comprises: the shell is provided with a containing cavity and an opening, and the opening is communicated with one end of the containing cavity along the first direction; the electrode assembly is arranged in the accommodating cavity and comprises an electrode assembly main body and a tab, and the tab is positioned on one side of the electrode assembly main body; the top cover plate is provided with two side surfaces which are oppositely arranged along the first direction, a pole hole penetrating through the two side surfaces along the first direction is formed in the top cover plate, and the top cover plate is covered at the opening of the shell; the conductive part comprises a conductive part and a connecting part which are connected with each other, the conductive part is inserted into the pole hole, and the connecting parts are positioned in the accommodating cavity and are electrically connected with the pole lugs; and an insulating seal member penetrating the pole hole and at least partially located between the conductive portion and the top cover sheet. According to the utility model, the sealing component and the insulating component are combined into a whole, the conductive part and the pins are combined into a whole, the number of structural parts is reduced, the cost is reduced, and the battery capacity is improved.

Description

Single battery and battery pack

Technical Field

The utility model relates to the technical field of power batteries, in particular to a single battery and a battery pack.

Background

The existing secondary battery top cover structure has more parts, including an upper insulating part, a lower insulating part, a sealing ring and the like, so that the top cover assembly process is complex and the cost is high; and the pole terminal and the pin are usually composed of a plurality of structural members, so that the cost is high, meanwhile, the space of the electrode assembly is occupied, the space is wasted, and the capacity of the electrode assembly is small.

In order to meet the low cost and high capacity density targets of secondary batteries, development of secondary battery related structures is required.

Disclosure of Invention

The purpose of the utility model is that: the single battery is designed, the number of structural parts is reduced, and the cost is reduced.

In order to achieve the above object, the present utility model provides a unit cell comprising:

the shell is provided with a containing cavity and an opening, and the opening is communicated with one end of the containing cavity along a first direction;

the electrode assembly is arranged in the accommodating cavity and comprises an electrode assembly main body and a tab, and the tab is arranged on at least one side of the electrode assembly main body;

the top cover plate is provided with two side faces which are oppositely arranged along the first direction, a pole hole penetrating through the two side faces along the first direction is formed in the top cover plate, and the top cover plate is covered at the opening of the shell;

the conductive part comprises a conductive part and a connecting part which are connected with each other, the conductive part is inserted into the pole column hole, and the connecting parts are all positioned in the accommodating cavity and are electrically connected with the pole lugs; and

and the insulating sealing piece is arranged in the pole column hole in a penetrating way and is at least partially positioned between the conductive part and the top cover sheet.

Preferably, the insulating seal comprises:

the sealing ring is arranged in the pole hole and is in butt joint with the conducting part and the hole wall of the pole hole;

the upper plastic is attached to one side, away from the shell, of the top cover sheet along the first direction, is arranged along the circumferential direction of the conductive part and is connected with the sealing ring;

and the lower plastic is attached to one side, close to the shell, of the top cover sheet along the first direction, and is arranged along the circumference of the conductive part and connected with the sealing ring.

Preferably, the sealing ring, the upper plastic and the lower plastic are integrally formed.

Preferably, the conductive member further includes a transition portion extending in a second direction and having both ends connected to the connection portion and the conductive portion, respectively, the transition portion being located between the top sheet and the electrode assembly, the second direction intersecting the first direction.

Preferably, the conductive portion, the transition portion and the connection portion are integrally formed.

Preferably, the tab is disposed on at least one side of the electrode assembly body along a second direction, and the connection part extends along the first direction;

wherein the first direction intersects the second direction.

Preferably, at least one side of the connecting part along the second direction is provided with a first connecting surface, and the first connecting surface is abutted to the tab.

Preferably, the insulating sealing member comprises an integrally formed body and a protruding portion, the body is arranged in the pole hole, the protruding portion extends along a first direction, a second connecting surface is arranged on one side, deviating from the electrode assembly along a second direction, of the connecting portion, and the protruding portion is abutted to the second connecting surface and is abutted to the inner wall of the shell.

Preferably, the protruding portion is strip-shaped and extends in a bending manner along the first direction.

In another preferred scheme, the tab is disposed on a side of the electrode assembly main body, which is close to the top cover sheet along the first direction, the connection portion extends along the second direction, a first connection surface is disposed on a side of the connection portion, which is away from the top cover sheet, and the first connection surface is abutted to the tab.

In another aspect of the present utility model, a battery pack is provided, including a plurality of the above-mentioned plurality of unit batteries, and adjacent unit batteries are connected by a conductive portion.

Preferably, adjacent single cells are connected by the conductive part

Compared with the prior art, the utility model has the beneficial effects that:

the single battery of the embodiment of the utility model optimizes the structure, combines the sealing component and the insulating component into the insulating sealing component, integrates the conductive part and the connecting part into the conductive part, reduces the number of structural parts, reduces the cost, saves the internal space of the housing accommodating cavity, and improves the capacity of the single battery core.

Drawings

FIG. 1 is an isometric view of a header assembly according to an embodiment of the present utility model;

FIG. 2 is a top view of a header assembly according to an embodiment of the present utility model;

FIG. 3 is a cross-sectional view taken along the direction A-A in FIG. 2;

FIG. 4 is an enlarged schematic view at B in FIG. 3;

FIG. 5 is an isometric view of a cap assembly according to another embodiment of the present utility model;

fig. 6 is an isometric view of a secondary battery according to an embodiment of the present utility model;

fig. 7 is a front view of a cap assembly coupled to an electrode assembly in a secondary battery according to an embodiment of the present utility model;

fig. 8 is an isometric view of a cap assembly coupled to an electrode assembly in a secondary battery according to an embodiment of the present utility model;

fig. 9 is a front view illustrating a connection of a top cap assembly and an electrode assembly in a secondary battery according to another embodiment of the present utility model;

fig. 10 is a side view illustrating a connection of a top cap assembly and an electrode assembly in a secondary battery according to another embodiment of the present utility model;

fig. 11 is an enlarged schematic view at C in fig. 10.

In the figure, 1, a shell; 11. an opening;

2. a top cover sheet; 21. a post hole;

3. an electrode assembly; 31. an electrode assembly main body; 32. a tab;

4. a conductive member; 41. a conductive portion; 42. a transition section; 43. a connection part; 431. a first connection surface; 432. a second connection surface;

5. an insulating seal; 51. applying plastic; 52. a seal ring; 53. lower plastic; 54. a protruding portion; 541. a first bending section; 542. a second bending section;

x, a first direction; y, second direction; z, third direction.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. in the present utility model are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should be understood that the terms "connected," "fixed," and the like are used in the present utility model in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; the mechanical connection can be realized, and the welding connection can be realized; 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.

The terms "first", "second", etc. are used in the present utility model to describe various information, but the information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, a "first" message may also be referred to as a "second" message, and similarly, a "second" message may also be referred to as a "first" message, without departing from the scope of the utility model.

The term "parallel" in this application includes not only the case of absolute parallelism, but also the case of substantially parallelism as is conventionally recognized in engineering; meanwhile, "vertical" includes not only the case of absolute vertical but also the case of substantially vertical as conventionally recognized in engineering. The distances are equal or the angles are equal, which not only includes the absolute equal condition, but also includes the approximate equal condition of the conventional cognition in engineering, and certain errors can exist.

As shown in the figure, the x direction is the first direction, the y direction is the second direction, and the z direction is the third direction.

Referring to fig. 1, 2 and 6, a battery cell according to a preferred embodiment of the present utility model includes: the case 1 has a housing chamber and an opening 11, the opening 11 communicating with one end of the housing chamber in the first direction X, the electrode assembly 3, the top cover sheet 2, the conductive member 4, and the insulating sealing member 5.

The electrode assembly 3 is arranged in the accommodating cavity, the electrode assembly 3 comprises an electrode assembly main body 31 and a tab 32, and the tab 32 is arranged on at least one side of the electrode assembly main body 31; the top cover sheet 2 has two side surfaces arranged opposite to each other in the first direction X, and the top cover sheet 2 is provided with a pole hole 21 penetrating through the two side surfaces in the first direction X, and the top cover sheet 2 is connected to the housing 1 and covers the opening 11 of the housing 1.

The conductive member 4 includes a conductive portion 41 and a connection portion 43 that are connected to each other, the conductive portion 41 is inserted into the pole hole 21, the connection portion 43 is located in the accommodating cavity and electrically connected to the tab 32, and at least a portion of the conductive portion 41 extends along the first direction X and an end far away from the connection portion 43 is located outside the housing 1. The insulating seal 5 is disposed through the post hole 21 and at least partially between the conductive portion 41 and the top cover sheet 2 to isolate the conductive portion 41 from the top cover sheet 2, thereby insulating the conductive portion 41 from the top cover sheet 2 and forming a seal.

In some refinements of the present application, the insulating seal 5 comprises: a seal ring 52, an upper plastic 51 and a lower plastic 53; the sealing ring 52 is arranged in the pole hole 21, the inner peripheral wall of the sealing ring 52 is abutted with the outer peripheral wall of the conductive part 41, and the outer peripheral wall of the sealing ring 52 is abutted with the hole wall of the pole hole 21 for realizing insulation sealing between the conductive part 41 and the top cover sheet 2; the upper plastic 51 is attached to one side of the top cover sheet 2, which is away from the shell 1 along the first direction X, and is used for being clamped with one side of the top cover sheet to prevent the insulating sealing element from falling off, and the upper plastic 51 is arranged along the circumferential direction of the conductive part 41 to wrap the conductive part and is connected with the sealing ring 52; the lower plastic 53 is attached to one side of the top cover sheet 2, which is close to the shell 1 along the first direction X, and is used for being clamped with the other side of the top cover sheet to prevent the insulating sealing element from falling off, and the lower plastic 53 is arranged along the circumferential direction of the conductive part 41 to wrap the insulating sealing element and is connected with the sealing ring 52; the upper plastic 51 and the lower plastic 53 are jointly clamped with the top cover sheet 2 to play a role of fixing the insulating sealing member 5, and meanwhile, the insulating sealing member 5 and the conductive member 4 are fixedly connected to ensure the stability of the single battery structure.

Referring to fig. 3 and 4, in some modifications of the present application, the seal ring 52, the upper plastic 51 and the lower plastic 53 are integrally formed, so as to ensure structural stability. Specifically, the insulating sealing member 5 can be formed by injection molding, and the insulating sealing member can achieve better insulating and sealing effects by injection molding of nano materials. Reference may be made to the following injection molding method: the conductive part 41 of the conductive member 4 passes through the pole hole 21 of the top cover sheet 2, the conductive member 4 and the top cover sheet 2 are placed in a mold of the insulating sealing member 5, the conductive part 41 and the pole hole 21 are coaxially arranged, a material is injected into the mold by adopting an injection molding method, the insulating sealing member 5 is molded, the conductive member 4 and the top cover sheet 2 are fixedly connected, and insulation and sealing are realized.

In some improvements of the present application, the conductive member 4 further includes a transition portion 42, the transition portion 42 extends along the second direction Y, the transition portion 42 is connected between the connection portion 43 and the conductive portion 41, the transition portion 42 is located between the top cover sheet 2 and the electrode assembly 3, and in a specific embodiment, the transition portion 42 is disposed between the lower plastic 53 and the electrode assembly 3, and is partially abutted with the lower plastic 53. Since the connection portion 43 and the conductive portion 41 extend along the first direction X, the transition portion 42 extends along the second direction Y, that is, the transition portion 42 extends along the periphery of the electrode assembly 3, so that a right angle or an approximately right angle is formed between the connection portion 43 and the conductive portion 41, which can improve the structural stability thereof. The first direction X is the height direction of the electrode assembly 3, the second direction Y is the length direction of the electrode assembly 3, and the third direction Z is the width direction of the electrode assembly 3.

Referring to fig. 9, 10 and 11, in other aspects of the present application, the transition portion 42 may be provided to extend in the third direction Z while the tab 32 is provided on the side of the electrode assembly body 31 adjacent to the cap sheet 2 in the first direction X, and the extending direction of the connection portion 43 is maintained parallel to the side of the cap sheet 2 adjacent to the case 1 in the first direction X and is connected to the electrode assembly 3 through the tab 32; specifically, the transition portion 42 forms a right-angle or an approximately right-angle with the conductive portion 41, the connection portion 43 is partially parallel to the transition portion 42, and the conductive portion 41 forms a right-angle or an approximately right-angle with the connection portion 43 and is connected through the transition portion 42. According to the scheme, the conductive piece 4 is positioned on one side, close to the top cover piece 2, of the electrode assembly 3 along the first direction X, the area of the electrode assembly 3 along the circumferential direction of the first direction X is not occupied, the volume of the shell 1 can be saved, and the cell capacity of the battery can be improved.

In some modifications of the present application, the conductive portion 41, the transition portion 42, and the connection portion 43 are integrally formed. Alternatively, the conductive member 4 may be a metal plate or the like bent twice to form the conductive portion 41, the transition portion 42, and the connection portion 43.

Referring to fig. 7, in some modifications of the present application, the tab 32 is provided at least one side of the electrode assembly body 31 in the second direction Y, and the connection part 43 extends in the first direction X; the first direction X intersects with the second direction Y, preferably the first direction X is perpendicular to the second direction Y, and the first direction X is a height direction of the electrode assembly 3 and the second direction Y is a length direction of the electrode assembly 3. Specifically, two tabs 32 are provided, which are respectively located at two sides of the electrode assembly main body 31 along the second direction Y, two conductive members 4 are provided, two conductive members 4 are disposed at intervals along the second direction Y, and each connection portion 43 is respectively connected with each tab 32 in a one-to-one correspondence manner. The connecting portion 43 is provided on the side surface in the longitudinal direction of the electrode assembly 3, so that the space utilization ratio is higher than that of the side surface in the width direction of the electrode assembly 3, the space of the accommodating cavity can be saved, and the cell capacity of the single cell can be effectively improved. Meanwhile, the conductive parts 4 are arranged on two sides of the electrode assembly 3 along the second direction Y, the transition parts 42 and the connecting parts 43 of the conductive parts are attached to the periphery of the electrode assembly 3, movement deformation of the conductive parts can be prevented, the positions are further fixed, and the stability of the whole structure is improved.

Referring to fig. 8, in some modifications of the present application, at least one side of the connection portion 43 along the second direction Y is provided with a first connection surface 431, and the first connection surface 431 abuts against the tab 32. The connecting part 43 and the tab 32 are welded by laser, and the first connecting surface 431 is arranged to be abutted against the tab 32 to increase the welding area, so that the overcurrent capacity is ensured.

Referring to fig. 5, in some modifications of the present application, the insulating seal 5 includes a body and a protrusion 54, and the protrusion 54 is integrally formed with the body; the body comprises an upper plastic 51, a sealing ring 52 and a lower plastic 53, and the protruding portion 54 is connected to one end of the lower plastic 53 far away from the sealing ring 52. The connecting portion 43 is provided with a second connecting surface 432 on a side facing away from the electrode assembly 3 in the second direction Y, and the protruding portion 54 abuts against the second connecting surface 432, protrudes in a direction away from the electrode assembly 3 with respect to the second connecting surface 432, and abuts against the inner wall of the case 1. For easy installation, the case 1 is usually designed to be in clearance fit with the electrode assembly 3, and after the electrode assembly 3 is put into the case, a clearance exists between the connection portion 43 of the conductive member 4 and the case 1, which affects the stability of the electrode assembly 3 in the case 1. The protruding part 54 is designed to fix the electrode assembly 3 in the accommodating cavity through the connecting part 43, so that shaking in the use process is avoided, and the safety of the battery is ensured. The protruding part 54 and the body are formed by one-step injection molding, when the body is injection molded by the injection mold for designing the conductive piece 4 and the top cover piece 2, an injection molding groove of the protruding part 54 is reserved at the position of the conductive piece 4 corresponding to the second connecting surface 432 and is connected with the injection molding groove of the body, so that the protruding part 54 is injection molded once when the body is injection molded, and meanwhile, the protruding part 54 is fixedly connected to the second connecting surface 432 in the injection molding process, so that the structural stability is ensured.

In some modifications of the present application, the protruding portion 54 is strip-shaped and extends in a bending manner along the second direction.

In some embodiments, the projections 54 are wavy.

In other embodiments, the projections 54 are serrated. Specifically, in the present embodiment, the protruding portion 54 includes a first bending section 541 and a second bending section 542 sequentially connected along the first direction X, and the first bending section 541 and the second bending section 542 are respectively bent towards two sides along the third direction Z; the first direction X, the second direction Y and the third direction Z are intersected pairwise. The first bending section 541 and the second bending section 542 are arranged to enable the protruding portion 54 to be serpentine along the first direction X, only occupy a part of the area of the second connecting surface 432, can be used for forming a welding path for welding the connecting portion 43 and the tab 32, meanwhile saves the injection molding cost of the protruding portion 54, can improve the contact area of the protruding portion 54 and the housing 1, and ensures the connection reliability of the protruding portion 54 and the housing 1.

In some modifications of the present application, the electrode assembly 3 includes two tabs 32; two pole holes 21 are formed in the top cover plate 2 at intervals, the two pole holes 21 are arranged at intervals along the second direction Y, a conductive piece 4 is mounted in each pole hole 21 through an insulating sealing piece 5, and the two conductive pieces 4 are connected with each pole lug 32 in a one-to-one correspondence mode through connecting portions 43. Optionally, the two electrode tabs 32 are respectively provided as a positive electrode tab 32 and a negative electrode tab 32 to be respectively connected to the two conductive members 4.

The embodiment of the utility model also comprises a battery pack, wherein the battery pack comprises a plurality of single batteries, and the single batteries are arranged among each other.

In some modifications of the present application, adjacent unit cells are electrically connected by the conductive portions 41 thereof.

In summary, the embodiment of the utility model provides a single battery, which has the following advantages:

1. the sealing component and the insulating component are combined into an integrated insulating sealing component 5, the post terminal and the pin are integrated into a conductive component 4, the number of structural components is reduced, and the cost of a single top cover is reduced;

2. the connection part 43 of the conductive member 4 is welded with the tab 32 arranged on the side surface of the electrode assembly 3 in the length direction by laser, so that the welding surface connection is increased, the occupied space can be reduced, and the cell capacity of the single cell is improved.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.

Claims (12)

1. The battery cell, its characterized in that includes:

the shell (1) is provided with a containing cavity and an opening (11), wherein the opening (11) is communicated with one end of the containing cavity along a first direction (X);

the electrode assembly (3) is arranged in the accommodating cavity, the electrode assembly (3) comprises an electrode assembly main body (31) and a tab (32), and the tab (32) is arranged on at least one side of the electrode assembly main body (31);

the top cover piece (2) is provided with two side faces which are oppositely arranged along the first direction (X), the top cover piece (2) is provided with a pole hole (21) which penetrates through the two side faces along the first direction (X), and the top cover piece (2) is covered at the opening (11) of the shell (1);

the conductive piece (4) comprises a conductive part (41) and a connecting part (43) which are connected with each other, the conductive part (41) is inserted into the pole hole (21), and the connecting part (43) is positioned in the accommodating cavity and is electrically connected with the pole lug (32); and

and an insulating seal (5) which is arranged in the pole hole (21) in a penetrating manner and is at least partially positioned between the conductive part (41) and the top cover sheet (2).

2. The cell according to claim 1, wherein the insulating seal (5) comprises:

a seal ring (52) provided in the pole hole (21) and abutting against the conductive portion (41) and the wall of the pole hole (21);

an upper plastic (51) which is attached to one side of the top cover sheet (2) away from the shell (1) along the first direction (X), wherein the upper plastic (51) is arranged along the circumferential direction of the conductive part (41) and is connected with the sealing ring (52);

and the lower plastic (53) is attached to one side, close to the shell (1), of the top cover sheet (2) along the first direction (X), and the lower plastic (53) is arranged along the circumferential direction of the conductive part (41) and is connected with the sealing ring (52).

3. The unit cell according to claim 2, characterized in that the sealing ring (52), the upper plastic (51) and the lower plastic (53) are integrally formed.

4. The unit cell according to claim 1, wherein the conductive member (4) further comprises a transition portion (42), the transition portion (42) extends in a second direction (Y), and both ends are respectively connected to the connection portion (43) and the conductive portion (41), the transition portion (42) is located between the top cap sheet (2) and the electrode assembly (3), and the second direction (Y) intersects the first direction (X).

5. The unit cell according to claim 4, characterized in that the conductive portion (41), the transition portion (42) and the connection portion (43) are integrally formed.

6. The unit cell according to claim 1, wherein the tab (32) is provided on at least one side of the electrode assembly main body (31) in a second direction (Y), and the connection portion (43) extends in the first direction (X);

wherein the first direction (X) intersects the second direction (Y).

7. The unit cell according to claim 6, characterized in that the connection portion (43) is provided with a first connection surface (431) along at least one side of the second direction (Y), the first connection surface (431) being in abutment with the tab (32).

8. The unit cell according to claim 6, characterized in that the insulating seal member (5) comprises an integrally formed body and a protruding portion (54), the body is arranged in the pole hole (21), the protruding portion (54) extends along the first direction (X), a second connecting surface (432) is arranged on one side, away from the electrode assembly (3), of the connecting portion (43) along the second direction (Y), and the protruding portion (54) is abutted against the second connecting surface (432) and abuts against the inner wall of the casing (1).

9. The unit cell according to claim 8, wherein said protruding portion (54) is strip-shaped and extends in a bending manner along said first direction (X).

10. The unit cell according to claim 1, wherein the tab (32) is disposed on a side of the electrode assembly main body (31) close to the top cover sheet (2) along the first direction (X), the connection portion (43) extends along the second direction (Y), a first connection surface (431) is disposed on a side of the connection portion (43) facing away from the top cover sheet (2), the first connection surface (431) is abutted against the tab (32), and the second direction (Y) intersects with the first direction (X).

11. A battery pack comprising a plurality of the single cells according to any one of claims 1 to 10.

12. The battery pack according to claim 11, wherein adjacent unit cells are connected by the conductive portion (41).