CN220138657U

CN220138657U - Single battery

Info

Publication number: CN220138657U
Application number: CN202223435089.3U
Authority: CN
Inventors: 周倩
Original assignee: Xinwangda Power Technology Co ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-12-05
Anticipated expiration: 2032-12-16

Abstract

The embodiment of the utility model discloses a single battery, wherein the single battery has a length direction and a height direction which are mutually perpendicular, and the single battery comprises: a housing having an opening at one end in a height direction; the top cover covers the opening and is connected with the shell to form a cavity, and the top cover is provided with a pole; a bare cell, wherein at least one side along the length direction is provided with a tab; the electrode pins are electrically connected with the electrode lugs and extend to be electrically connected with the electrode posts along the height direction; the battery cell still includes the insulating film of holding in the cavity, and the insulating film is provided with and holds the chamber, holds the chamber and has the inner wall, and the inner wall is equipped with the accommodation structure along at least one end of length direction, and the accommodation structure is connected with the inner wall that holds the chamber and is formed the appearance chamber that extends in length direction, and naked electric core setting is holding the intracavity, and electrode pin holds in holding the chamber. According to the utility model, the electrode pins are protected and supported.

Description

Single battery

Technical Field

The utility model relates to the technical field of lithium ion battery preparation, in particular to a single battery.

Background

The design of the anode pin and the cathode pin is more suitable for a power type battery cell with high-rate discharge requirement. Compared with the battery core of the U-shaped structural member, the battery core of the T-shaped structural member has lower charge and discharge temperature rise under the same multiplying power, and the temperature distribution of the battery core is more uniform. However, the battery core of the T-shaped structural member has a certain problem, such as the positive and negative electrode pins are easy to break after the vibration reliability test, so that the battery core fails. Therefore, how to protect the positive and negative pins and avoid the failure of the battery core caused by the breakage of the positive and negative pins becomes a urgent problem to be solved.

Disclosure of Invention

The embodiment of the utility model provides a single battery which plays roles in protecting and supporting electrode pins.

In order to solve the technical problems, the embodiment of the utility model discloses the following technical scheme:

in one aspect, a single cell is provided, having a length direction and a height direction perpendicular to each other, the single cell comprising: a housing having an opening at one end in a height direction; the top cover covers the opening and is connected with the shell to form a cavity, and the top cover is provided with a pole; a bare cell, wherein at least one side along the length direction is provided with a tab; the electrode pins are electrically connected with the electrode lugs and extend to be electrically connected with the electrode posts along the height direction; the battery cell still includes the insulating film of holding in the cavity, and the insulating film is provided with and holds the chamber, holds the chamber and has the inner wall, and the inner wall is equipped with the accommodation structure along at least one end of length direction, and the accommodation structure is connected with the inner wall that holds the chamber and is formed the appearance chamber that extends in length direction, and naked electric core setting is holding the intracavity, and electrode pin holds in holding the chamber.

In addition to, or as an alternative to, one or more of the features disclosed above, the tab is at least partially housed in the cavity.

In addition to or in lieu of one or more of the features disclosed above, the cell also has a thickness direction perpendicular to both the height direction and the length direction, along which the tab at least partially coincides with the projection of the receiving structure; along the length direction, the size of the cavity is D ₁ The projection superposition size of the lug and the accommodating structure is D ₂ The method comprises the following steps: d is more than or equal to 0.5 ₂ /D ₁ ≤0.8。

In addition to one or more features disclosed above, or alternatively, the unit cell has a thickness direction perpendicular to both the height direction and the length direction, and the receiving structure includes a bottom plate extending in the thickness direction and two side plates extending in the height direction; the two side plates are arranged at intervals along the thickness direction and connected to the inner wall, the bottom plate is connected to the bottom ends of the two side plates and the inner wall, and the two side plates, the bottom plate and the inner wall enclose a containing cavity; the two side plates are arranged at intervals in the thickness direction to form interval openings, the electrode lugs at least partially penetrate through the interval openings and are accommodated in the accommodating cavity, and the electrode pins are connected with at least one of the side plates and the bottom plate.

In addition to one or more features disclosed above, or alternatively, the single cell has a thickness direction perpendicular to the height direction, and the electrode leads at least partially coincide with a projection of the receiving structure in the thickness direction.

In addition to or in lieu of one or more of the features disclosed above, the electrode lead includes a first lead tab extending in a length direction and a second lead tab extending in a height direction, one end of the first lead tab being electrically connected to the pole and the other end being connected to one end of the second lead tab, the second lead tab being electrically connected to the tab, and the second lead tab being received in the cavity.

In addition to or in lieu of one or more of the features disclosed above, an end of the second pin piece remote from the first pin piece abuts the receiving structure.

In addition to or instead of one or more of the features disclosed above, the unit cell has a thickness direction perpendicular to both the height direction and the length direction, and the second lead tab extends in the length direction with two lead protrusions disposed at a distance in the thickness direction, and the tab is connected between the two lead protrusions.

In addition to or in lieu of one or more of the features disclosed above, the second pin sheet is provided with a notch extending in the height direction Z, the notch extending through the second pin sheet in the length direction X.

In addition to or as one or more features disclosed aboveInstead, the bottom of the accommodating structure and the bottom of the accommodating cavity have a first gap in the height direction; the dimension of the first gap is H along the height direction ₁ The size of the accommodating cavity is H ₂ The method comprises the following steps: h is more than or equal to 0.1 ₁ /H ₂ ≤0.5。

The single battery in the technical scheme has the following advantages or beneficial effects: when the insulating film is arranged in the cavity and the bare cell is arranged in the accommodating cavity, the electrode pins are positioned in the accommodating cavity, and the accommodating cavity performs avoidance protection and support on the electrode pins; the electrode pins are wrapped by the containing cavity, so that the electrode pins are protected and supported, and external force is buffered and counteracted, so that the electrode pins are prevented from being broken and losing efficacy caused by the single battery in the vibration process. And the two pole ears are respectively and electrically connected with the two pole posts through the two electrode pins, and finally the top cover is covered with an opening, so that the assembly of the single battery is realized. The safety and reliability of the single battery are improved; the added insulating film has low cost and does not need to introduce other production procedures.

Drawings

The technical solution and other advantageous effects of the present utility model will be made apparent by the following detailed description of the specific embodiments of the present utility model with reference to the accompanying drawings.

Fig. 1 is an exploded view of a single battery according to an embodiment of the present utility model;

fig. 2 is a cross-sectional view of a single battery provided according to an embodiment of the present utility model;

fig. 3 is an external structural view of a unit cell according to an embodiment of the present utility model;

FIG. 4 is a block diagram of the top cover and housing provided in accordance with an embodiment of the present utility model when packaged;

fig. 5 is a structural view of an insulating film provided according to an embodiment of the present utility model;

fig. 6 is a cross-sectional view of an insulating film provided according to an embodiment of the present utility model;

fig. 7 is a block diagram of an electrode pin provided according to an embodiment of the present utility model;

fig. 8 is a structural view of a top cover provided according to an embodiment of the present utility model.

Detailed Description

In order to make the objects, technical solutions and advantageous effects of the present utility model more apparent, the present utility model will be further described in detail with reference to the accompanying drawings and detailed description. It should be understood that the detailed description is intended to illustrate the utility model, and not to limit the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element 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. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are 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 one or more of the described features. In the description of the present utility model, the meaning of "plurality" means two or more, unless specifically defined otherwise.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; the connection may be mechanical connection, direct connection or indirect connection through an intermediate medium, and may be internal connection of two elements or interaction relationship of two elements. 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 the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.

Fig. 1 is an exploded schematic view of a single battery provided according to the present embodiment, fig. 2 is a cross-sectional view of a single battery provided according to the present embodiment, fig. 3 is an external structural view of a single battery provided according to the present embodiment, fig. 4 is a structural view of a top cover 1 and a case 5 provided according to the present embodiment when packaged, fig. 5 is a structural view of an insulating film 3 according to the present embodiment, fig. 6 is a cross-sectional view of an insulating film 3 according to the present embodiment, and referring to fig. 1 to 6, a single battery having a length direction X, a thickness direction Y, and a height direction Z perpendicular to each other in two pairs, the length direction X and the height direction Z, the length direction X and the thickness direction Y, and the length direction Y and the height direction Z being perpendicular and having an error distance. The single battery includes: the shell 5 is made of aluminum, and one end of the shell 5 in the height direction Z is provided with an opening 51; the top cover 1 covers the opening 51 and is connected with the shell 5 to form a cavity 7, the top cover 1 is provided with two polar posts 11, and the number of the polar posts 11 is one positive and one negative; the bare cell 2 is provided with two electrode lugs 21, the two electrode lugs 21 are arranged on two sides of the bare cell 2 along the length direction X, and the two electrode lugs 21 are positive and negative; the electrode pins 4 are two and one positive and one negative (only one electrode pin 4 is shown in fig. 1), and the electrode pin 4 of the positive electrode is electrically connected with the tab 21 of the positive electrode and extends in the height direction Z to be electrically connected with the post 11 of the positive electrode.

The single battery further comprises an insulating film 3 accommodated in the cavity 7, wherein the insulating film 3 is a mylar film, and the mylar film is at least one of PP material or PE material capable of preventing electrolyte. The insulating film 3 plays a role of insulation from the case. The insulating film 3 is provided with a housing chamber 32, the housing chamber 32 has an inner wall 32a, both ends of the inner wall 32a along the length direction X are provided with housing structures 33, see fig. 5 and 6, and the housing structures 33 are provided in two and symmetrically arranged in the housing chamber 32 along the length direction X; and the accommodating structure 33 is connected with the inner wall 32a and forms the accommodating cavity 6 extending in the length direction X, so that the accommodating cavities 6 are two and symmetrically positioned in the accommodating cavity 32 along the length direction X; the bare cell 2 is disposed in the accommodating cavity 32, and the two electrode pins 4 are respectively accommodated in the two accommodating cavities 6.

When the insulating film 3 is arranged in the cavity 7 and the bare cell 2 is arranged in the accommodating cavity 32, the electrode pin 4 is positioned in the accommodating cavity 6, and the accommodating cavity 6 performs avoidance protection and support on the electrode pin 4; namely, the containing cavity 6 wraps the electrode pin 4, plays a role in protecting and supporting the electrode pin 4, and buffers and counteracts external force (the external force can be brought by a vibration reliability test), so that the electrode pin 4 is prevented from being broken and losing efficacy in the vibration process of the single battery. The two pole ears 21 are respectively and electrically connected with the two pole posts 11 with the same polarity through the two electrode pins 4, and finally the top cover 1 is covered with the opening 51 to realize the assembly of the single battery. The safety and reliability of the single battery are improved; the cost of adding the insulating film 3 is low, and no other production process is required.

It should be noted that the space of the cavity 7 occupied by the thickness of the insulating film 3 itself is removed, and the size of the accommodating cavity 32 is the same as the remaining space of the cavity 7.

In the present embodiment, the insulating film 3 is provided with an opening 31 communicating with the accommodating chamber 32 in the height direction Z, so that the insulating film 3 has a barrel-like structure and the accommodating chamber 32 has a U-shaped structure. The bare cell 2 is loaded into the accommodation chamber 32 through the opening 31.

Wherein, when the top cover 1 covers the opening 51, the opening 31 of the insulating film 3 is connected with the top cover 1 through hot melt plastic, so that the insulating film 3 is kept stable in the cavity 7.

In some embodiments, the insulating film 3 may be formed by folding a sheet structure, where the sheet structure has a first folding region, a second folding region and a third folding region after being folded, the first folding region is a receiving cavity 32, the bare cell 2 is disposed in the receiving cavity 32, the second folding region and the third folding region are receiving structures 33, and the two electrode pins 4 are received in the two receiving structures 33.

In the present embodiment, the insulating film 3 is of an integrally molded structure.

In the present embodiment, the insulating film 3 is provided with an opening for infiltration of an electrolyte.

In this embodiment, the tab 21 is at least partially accommodated in the accommodating cavity 6. The tab 21 is at least partially accommodated in the accommodating cavity 6, and the length of the tab 21 in the thickness direction Y is smaller than the length of the accommodating structure 33 in the thickness direction Y. When the electrode lug 21 is electrically connected with the electrode pin 4, the electrode pin 4 wraps at least part of the electrode lug 21, and at least part of the electrode lug 21 is also positioned in the accommodating cavity 6; or the electrode pin 4 wraps the tab 21, and the tab 21 is also located in the cavity 6.

In the present embodiment, along the thickness direction Y, the tab 21 at least partially coincides with the projection of the accommodating structure 33; that is, the tab 21 and the receiving structure 33 are not uniform in length in the thickness direction Y. Specifically, along the length direction X, the size of the cavity 6 is D ₁ The dimension of the projection superposition of the tab 21 and the accommodating structure 33 is D ₂ The method comprises the following steps: d is more than or equal to 0.5 ₂ /D ₁ Less than or equal to 0.8. For example, the dimension D of the cavity 6 ₁ The projection superposition dimension D of the tab 21 and the accommodating structure 33 is 3mm ₂ 2mm, D ₂ /D ₁ Is 2mm/3mm approximately equal to 0.67, and meets the following conditions: d is more than or equal to 0.5 ₂ /D ₁ ≤0.8。

It should be noted that the dimensions of the cavity 6, the projected overlapping dimensions of the tab 21 and the receiving structure 33 are given by way of example only, as long as D ₂ /D ₁ The ratio of (C) to (D) is 0.5-D ₂ /D ₁ Any value within the range of less than or equal to 0.8 is within the protection range of the utility model.

In the present embodiment, referring to fig. 5, the accommodating structure 33 includes a bottom plate 332 extending in the thickness direction Y and two side plates 331 extending in the height direction Z. The two side plates 331 are arranged at intervals along the thickness direction Y and connected to the inner wall 32a, the bottom plate 332 is connected to the bottom ends of the two side plates 331 and the inner wall 32a, and the two side plates 331 and the bottom plate 332 and the inner wall 32a enclose a containing cavity 6; the two side plates 331 are arranged at intervals in the thickness direction Y to form a spacing opening 331a, the tab 21 at least partially penetrates through the spacing opening 331a and is accommodated in the accommodating cavity 6, the electrode pin 4 is connected with at least one of the side plates 331 and the bottom plate 332, and preferably, the electrode pin 4 is abutted against both the side plates 331 and the bottom plate 332. When the bare cell 2 is mounted in the accommodating cavity 32, the accommodating cavity 6 protects and supports the electrode pin 4, namely, the side plate 331 and the bottom plate 332 protect and support the electrode pin 4.

In the present embodiment, the projection of the electrode pin 4 and the accommodating structure 33 in the thickness direction Y at least partially coincides. I.e. the electrode pins 4 are not identical in length in the thickness direction Y with the receiving structure 33. When the electrode lead 4 is accommodated in the accommodating chamber 6, the electrode lead 4 is in contact with the inner wall 32a of the accommodating chamber 6 in the thickness direction Y, or the electrode lead 4 is at least partially in contact with the inner wall 32a of the accommodating chamber 6 in the thickness direction Y.

In the present embodiment, fig. 7 is a structural view of the electrode pin 4 provided according to the present embodiment, referring to fig. 7, the electrode pin 4 includes a first pin piece 41 extending in the length direction X and a second pin piece 42 extending in the height direction Z; one end of the first pin piece 41 is electrically connected with the pole 11, the other end is connected with one end of the second pin piece 42, the second pin piece 42 is electrically connected with the pole ear 21, and the second pin piece 42 is accommodated in the accommodating cavity 6. The electrode pin 4 is designed into a first pin piece 41 and a second pin piece 42 which are connected, the first pin piece 41 is electrically connected with the pole 11 in the length direction X, and the second pin piece 42 is electrically connected with the pole lug 21 in the height direction Z, so that the pole 11, the electrode pin 4 and the pole lug 21 are electrically connected.

In this embodiment, referring to fig. 2, an end of the second lead piece 42 away from the first lead piece 41 abuts against the accommodating structure 33. The second pin piece 42 is electrically connected with the tab 21 in the height direction Z, the second pin piece 42 is accommodated in the accommodating cavity 6, at this time, the second pin piece 42 is abutted to the accommodating structure 33, and the accommodating cavity 6 protects and supports the second pin piece 42.

In the present embodiment, referring to fig. 7, the second lead tab 42 is extended with two lead protrusions 421 in the length direction X, the two lead protrusions 421 are disposed at intervals in the thickness direction Y, and the tab 21 is connected between the two lead protrusions 421. The second pin piece 42 is provided with two pin protrusions 421, and the electrode pin 4 and the electrode tab 21 are electrically connected by clamping the electrode tab 21 between the two pin protrusions 421.

In the present embodiment, the second lead piece 42 is provided with a notch 422 extending along the height direction Z, and the notch 422 penetrates the second lead piece 42 along the length direction X. The second pin piece 42 saves materials and reduces the production cost of the electrode pin 4 by arranging the notch 422. Referring to fig. 7, the notch 422 is located between two pin bosses 421.

In the present embodiment, referring to fig. 6, the bottom of the accommodating structure 33 and the bottom of the accommodating chamber 32 have the first gap 8 in the height direction Z. The accommodating structure 33 is disposed in the accommodating cavity 32 according to the position of the tab 21 of the bare cell 2, so that the accommodating structure 33 can wrap the electrode pin 4 when the electrode pin 4 is electrically connected with the tab 21.

Specifically, along the height direction Z, the first gap 8 has a dimension H ₁ The size of the accommodating cavity 32 is H ₂ The method comprises the following steps: h is more than or equal to 0.1 ₁ /H ₂ Less than or equal to 0.5. For example, the dimension H of the first gap 8 ₁ Dimension H of the receiving chamber 32 is 2mm ₂ 5mm, H ₁ /H ₂ Is 2mm/5mm approximately equal to 0.4, and meets the following conditions: h is more than or equal to 0.1 ₁ /H ₂ ≤0.5。

It should be noted that the dimensions of the first gap 8, the dimensions of the receiving chamber 32 are given by way of example only, as long as H ₁ /H ₂ The ratio of (2) is 0.1 to H ₁ /H ₂ Any value within the range of less than or equal to 0.5 is within the protection range of the utility model.

In the present embodiment, referring to fig. 2, the top of the accommodating structure 33 has a second gap 9 with the top cover 1 in the height direction Z. The second gap 9 also gives way to the electrode pin 4, facilitating the electrical connection of the electrode pin 4 with the pole 11.

In the present embodiment, fig. 8 is a structural view of the top cover 1 provided according to the present embodiment, and referring to fig. 1 and 8, a first through hole 12 and a second through hole 13 are provided on the top cover 1, the first through hole 12 is used for injecting electrolyte into the cavity 7, and the second through hole 13 is used for installing the explosion-proof valve 14. The top cover 1 is further provided with a top cover patch 15 on a side facing the opening 51, and the top cover patch 15 plays an insulating role.

Another single battery having a longitudinal direction X and a height direction Z perpendicular to each other, the single battery comprising: a housing 5 provided with an opening 51 at one end in the height direction Z; the top cover 1 covers the opening 51 and is connected with the shell 5 to form a cavity 7, the top cover 1 is provided with two polar posts 11, and the number of the polar posts 11 is one positive and one negative; the bare cell 2 is provided with two electrode lugs 21, and the two electrode lugs 21 are arranged on one side of the bare cell 2 along the length direction X; the electrode pins 4 are electrically connected with the lugs 21 and extend along the height direction Z to be electrically connected with the pole 11, and the number of the electrode pins 4 is two and is one positive and one negative.

The single battery further comprises an insulating film 3 accommodated in the cavity 7, the insulating film 3 is provided with an accommodating cavity 32, the accommodating cavity 32 is provided with an inner wall 32a, one end of the inner wall 32a along the length direction X is provided with accommodating structures 33, and two accommodating structures 33 are arranged on one side of the accommodating cavity 32 along the length direction X; and the accommodating structure 33 is connected with the inner wall 32a and forms the accommodating cavity 6 extending in the length direction X, so that the accommodating cavities 6 are two and are located at one side of the accommodating cavity 32 along the length direction X, the bare cell 2 is arranged in the accommodating cavity 32, and the two electrode pins 4 are respectively accommodated in the two accommodating cavities 6.

It should be noted that, according to the position of the tab 21 on the bare cell 2, the corresponding insulating film 3 is designed with its accommodating structure 33 so as to ensure that the electrode pin 4 is always accommodated in the accommodating cavity 6 when the bare cell 2 is disposed in the accommodating cavity 32. The electrode pin 4 is wrapped by the containing cavity 6, and the containing cavity plays a role in protecting and supporting the electrode pin 4, and buffers and counteracts external force.

The above steps are presented merely to aid in understanding the method, structure, and core concept of the utility model. It will be apparent to those skilled in the art that various changes and modifications can be made to the present utility model without departing from the principles of the utility model, and such changes and modifications are intended to be included within the scope of the appended claims.

Claims

1. A unit cell having a longitudinal direction (X) and a height direction (Z) perpendicular to each other, the unit cell comprising:

a housing (5) provided with an opening (51) at one end in the height direction (Z);

the top cover (1) covers the opening (51) and is connected with the shell (5) to form a cavity (7), and the top cover (1) is provided with a pole (11);

a bare cell (2) provided with a tab (21) along at least one side of the length direction (X);

an electrode pin (4) electrically connected with the tab (21) and extending in the height direction (Z) to be electrically connected with the post (11);

the battery cell is characterized in that the battery cell further comprises an insulating film (3) accommodated in the cavity (7), the insulating film (3) is provided with an accommodating cavity (32), the accommodating cavity (32) is provided with an inner wall (32 a), at least one end of the inner wall (32 a) along the length direction (X) is provided with an accommodating structure (33), the accommodating structure (33) is connected with the inner wall (32 a) and forms an accommodating cavity (6) extending in the length direction (X), the bare cell (2) is arranged in the accommodating cavity (32), and the electrode pin (4) is accommodated in the accommodating cavity (6).

2. A single cell according to claim 1, wherein the tab (21) is at least partially housed in the cavity (6).

3. A single cell according to claim 2, wherein the single cell further has a thickness direction (Y) perpendicular to both the height direction (Z) and the length direction (X), along which thickness direction (Y) the tab (21) at least partially coincides with the projection of the receiving structure (33); along the length direction (X), the size of the containing cavity (6) is D ₁ The dimension of the projection superposition of the lug (21) and the accommodating structure (33) is D ₂ The method comprises the following steps: d is more than or equal to 0.5 ₂ /D ₁ ≤0.8。

4. A single cell according to claim 1, wherein the single cell has a thickness direction (Y) perpendicular to both the height direction (Z) and the length direction (X), and the housing structure (33) comprises a bottom plate (332) extending in the thickness direction (Y) and two side plates (331) extending in the height direction (Z); the two side plates (331) are arranged at intervals along the thickness direction (Y) and connected to the inner wall (32 a), the bottom plate (332) is connected to the bottom ends of the two side plates (331) and the inner wall (32 a), and the two side plates (331), the bottom plate (332) and the inner wall (32 a) enclose the accommodating cavity (6); the two side plates (331) are arranged at intervals in the thickness direction (Y) to form interval openings (331 a), the electrode lugs (21) at least partially penetrate through the interval openings (331 a) and are accommodated in the accommodating cavity (6), and the electrode pins (4) are connected with at least one of the side plates (331) and the bottom plate (332).

5. A cell according to claim 1, wherein the cell has a thickness direction (Y) perpendicular to both the height direction (Z) and the length direction (X), the electrode pins (4) being at least partially coincident with the projection of the receiving structure (33) in the thickness direction (Y).

6. A single cell as claimed in claim 1, wherein said electrode pins (4) comprise a first pin piece (41) extending in said length direction (X) and a second pin piece (42) extending in said height direction (Z); one end of the first pin sheet (41) is electrically connected with the pole (11), the other end of the first pin sheet is connected with one end of the second pin sheet (42), the second pin sheet (42) is electrically connected with the pole lug (21), and the second pin sheet (42) is accommodated in the accommodating cavity (6).

7. A single cell as claimed in claim 6, wherein an end of said second lead tab (42) remote from said first lead tab (41) abuts said receiving formation (33).

8. A unit cell according to claim 6, wherein said unit cell has a thickness direction (Y) perpendicular to both said height direction (Z) and said length direction (X), said second lead tab (42) extends with two lead protrusions (421), two of said lead protrusions (421) are disposed at an interval in said thickness direction (Y), and said tab (21) is connected between two of said lead protrusions (421).

9. A cell according to claim 6, wherein the second lead tab (42) is provided with a notch (422) extending in the height direction (Z), the notch (422) extending through the second lead tab (42) in the length direction (X).

10. A single cell as claimed in claim 1, wherein the bottom of said containment structure (33) and the bottom of said containment cavity (32) have a first gap (8) in said height direction (Z); along the height direction (Z), the first gap (8) has a dimension H ₁ The size of the accommodating cavity (32) is H ₂ The method comprises the following steps: h is more than or equal to 0.1 ₁ /H ₂ ≤0.5。