CN220122049U

CN220122049U - Battery module and battery pack

Info

Publication number: CN220122049U
Application number: CN202320959760.XU
Authority: CN
Inventors: 袁铖; 杨伟; 陈辉
Original assignee: Xinwangda Power Technology Co ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2023-04-24
Filing date: 2023-04-24
Publication date: 2023-12-01
Anticipated expiration: 2033-04-24

Abstract

The utility model relates to the technical field of new energy, and discloses a battery module and a battery pack, wherein the battery module comprises: a plurality of unit cells arranged along the second direction; the single battery comprises a shell, a top cover, a first pole and a second pole, wherein the top cover is arranged at one end of the shell along the third direction, and the first pole and the second pole are arranged on the top cover at intervals along the first direction; the first pole of one of the adjacent two single batteries extends at least partially along the second direction and is connected with the second pole of the other single battery. The utility model does not need to arrange the bus bar in the prior art, thereby simplifying the internal structure of the battery pack, reducing assembly parts, lowering operation difficulty, improving assembly efficiency and lowering economic cost.

Description

Battery module and battery pack

Technical Field

The present utility model relates to the field of battery technologies, and in particular, to a battery module and a battery pack.

Background

Currently, a plurality of single batteries are usually arranged in a battery pack, and each single battery is connected in parallel or in series through a bus bar. During assembly, the busbar is required to be installed after each single battery is installed, and the assembly parts are more, so that the operation difficulty is high and the assembly efficiency is low.

Disclosure of Invention

The purpose of the utility model is that: the battery module and the battery pack can simplify the internal structure of the battery module, reduce assembly parts, reduce operation difficulty, improve assembly efficiency and reduce economic cost.

In order to achieve the above object, the present utility model provides a battery module having a first direction, a second direction, and a third direction intersecting with each other, the battery module comprising:

a plurality of unit cells arranged along the second direction;

the single battery module comprises a shell, a top cover, a first pole and a second pole, wherein the top cover is arranged at one end of the shell along the third direction, and the first pole and the second pole are arranged at intervals on the top cover along the first direction;

the first pole of one of the adjacent two single batteries extends at least partially along the second direction and is connected with the second pole of the other single battery.

In some embodiments of the present utility model, the unit cell further includes an insulating member, the top cover has a through hole penetrating along the third direction, the insulating member fills the through hole, and the first and second poles penetrate through the insulating member.

In some embodiments of the present utility model, the first poles are provided in plurality, and the plurality of first poles are spaced in the first direction;

the second pole is provided with a plurality of second poles, the second poles are arranged at intervals in the first direction, and the first poles and the second poles are connected in one-to-one correspondence.

In some embodiments of the present utility model, the first poles are provided in plurality, and the plurality of first poles are spaced apart in the second direction;

the second pole comprises a first body and a contact part, the first body penetrates through the top cover, the contact part is connected to one end of the first body, which is away from the shell, and extends along the second direction, and the extending directions of two adjacent contact parts are away from each other;

the first pole posts and the contact parts are connected in a one-to-one correspondence.

In some embodiments of the utility model, along the third direction, a projection of the first pole on a plane in which the contact portion lies at least partially covers the contact portion.

In some embodiments of the present utility model, the first pole includes a second body and a converging portion, the second body is penetrating through the top cover, and the converging portion is integrally connected to one end of the second body far away from the housing, extends along the second direction, and is connected to the second pole of the other one; in the second direction, the converging portion has a dimension L ₁ mm, the size of the single battery is L ₂ mm, satisfy: l is more than 0.5 ₁ /L ₂ ＜2。

In some embodiments of the present utility model, the first pole includes a second body and a converging portion, the second body is penetrating through the top cover, and the converging portion is integrally connected to one end of the second body far away from the housing, extends along the second direction, and is connected to the second pole of the other one; the dimension of the converging part along the third direction is D ₁ mm, dimension D in the first direction ₂ mm, satisfy: d is more than 0.01 ₁ /D ₂ ＜0.5。

In some embodiments of the present utility model, a surface of the insulating member facing away from the side of the housing in the third direction is provided with a void-avoiding groove provided corresponding to the second post, and the second post covers the void-avoiding groove.

In some embodiments of the present utility model, the first pole includes a second body, a thinned portion, and a converging portion, the thinned portion is connected between the second body and the converging portion, the second body is disposed through the top cover, and the converging portion extends along the second direction and is connected with the second pole of the other one.

In some embodiments of the present utility model, the thinning portion includes a third body, the third body is connected between the second body and the converging portion, and at least one side of the third body along the second direction is provided with a groove.

In some embodiments of the present utility model, a length of an overlapping portion of the contact portion and the first pole in the second direction is L ₃ mm, the dimension of the single battery along the second direction (Y) is L ₂ mm, the dimension of the contact part along the third direction is D ₃ mm, satisfy: 4 is less than or equal to L ₃ ≤(1/2×L ₂ +2×D ₃ )。

The utility model also provides a battery pack comprising the battery module.

The utility model provides a battery module and a battery pack, which have the beneficial effects that compared with the prior art:

according to the battery module, two adjacent single batteries extend to the second pole of the other through the first pole of one of the two adjacent single batteries, and the two adjacent single batteries are directly connected, so that the single batteries are electrically connected with each other, and a bus bar in the prior art is not required to be arranged, so that the internal structure of the battery module is simplified, assembly parts are reduced, the operation difficulty is reduced, the assembly efficiency is improved, and the economic cost is reduced.

The battery pack comprises the battery module, and a bus bar in the prior art is not required to be arranged, so that the internal structure of the battery module is simplified, assembly parts are reduced, the operation difficulty is reduced, the assembly efficiency is improved, and the economic cost is reduced.

Drawings

Fig. 1 is a schematic structural view of a unit cell according to an embodiment of the present utility model.

Fig. 2 is a schematic diagram illustrating connection between adjacent unit cells according to an embodiment of the present utility model.

Fig. 3 is a schematic view of a part of the structure of a single battery according to an embodiment of the present utility model.

Fig. 4 is a side view of fig. 3.

Fig. 5 is an enlarged schematic view of fig. 4 at i.

Fig. 6 is a top view of fig. 3.

Fig. 7 is a side view of the other angle of fig. 3.

Fig. 8 is an enlarged schematic view at ii in fig. 7.

Fig. 9 is a schematic structural view of a top cover according to an embodiment of the present utility model.

Fig. 10 is an enlarged schematic view at iii in fig. 2.

Fig. 11 is a schematic structural view of a first pole according to an embodiment of the present utility model.

In the figure, 100, single batteries;

1. a top cover; 2. an insulating member; 3. a first pole; 4. a housing; 5. a second post; 11. a through hole; 21. an empty-avoiding groove; 31. a thinning portion; 32. a second body; 33. confluence part

51. A first body; 52. a contact portion;

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 noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

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; 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.

Furthermore, in the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

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.

Referring to fig. 1 and 2, a battery module according to a preferred embodiment of the present utility model has a first direction X, a second direction Y and a third direction Z intersecting each other.

The battery module includes a plurality of unit batteries 100, and the plurality of unit batteries 100 are arranged along the second direction Y.

The single battery 100 includes a housing 4, a top cover 1, a first pole 3 and a second pole 5, the top cover 1 is disposed at one end of the housing 4 along a third direction Z, and the first pole 3 and the second pole 5 are disposed on the top cover 1 along a first direction X at intervals. The housing 4 is provided with a housing cavity therein, and an electrode assembly is disposed in the housing cavity, and a positive tab and a negative tab of the electrode assembly are electrically connected with the first and second posts 5, respectively.

The first pole 3 may be a positive pole or a negative pole, and the polarities of the first pole 3 and the second pole 5 are opposite.

In the adjacent two unit batteries 100, the first pole 3 of one of the unit batteries extends at least partially along the second direction Y and is connected to the second pole 5 of the other unit battery.

In this embodiment, two adjacent single batteries 100 extend from the first pole 3 of one to the second pole 5 of the other, and the two single batteries 100 are directly connected, so that the single batteries 100 are electrically connected with each other without providing a bus bar in the prior art, thereby simplifying the internal structure of the battery module, reducing assembly components, reducing operation difficulty, improving assembly efficiency, and reducing manufacturing cost.

Specifically, the first pole 3 and the second pole 5 in the present embodiment are respectively disposed at two ends of the unit cells 100 along the first direction X, and the first pole 3 of one of the adjacent two unit cells 100 and the second pole 5 of the other are located at the same end along the first direction X, so that the first pole 3 of one unit cell and the second pole 5 of the other are close to each other, so that the first pole 3 of each unit cell 100 can be connected to the second pole 5 of the adjacent unit cell 100.

Referring to fig. 3 and 9, the single battery 100 further includes an insulating member 2, the top cover 1 has a through hole 11 penetrating along the third direction Z, the insulating member 2 fills the through hole 11, and the first pole 3 and the second pole 5 penetrate through the insulating member 2.

In the present embodiment, through holes 11 are provided on both ends of the top cover 1 in the first direction X, respectively. The first pole 3 and the second pole 5 are respectively penetrated through holes 11 at two ends of the top cover 1. The insulator 2 is filled in the through hole 11 and wraps the portions of the first and second poles 3 and 5 opposite to the top cover 1. The insulator 2 seals the through hole 11, and also allows the first pole 3 to be insulated from the top cover 1, and the second pole 5 to be insulated from the top cover 1. The first pole 3 is only contacted with the top cover 1 through the insulating piece 3, and the second pole 5 is also only contacted with the top cover 1 through the insulating piece 3, so that the insulating function of the insulating piece 3 is realized.

In some embodiments, the first poles 3 are provided in plurality, and the plurality of first poles 3 are disposed at intervals in the first direction X. Increasing the number of first poles 3, in effect, increases the overcurrent area, thereby improving the overcurrent efficiency of the battery module, and improving the quick-charge performance of the battery pack as a whole. The plurality of first poles 3 are each located at one end of the top cover 1 in the first direction X.

Since the first poles 3 are to extend along the second direction Y, the first poles 3 are to be prevented from interfering with each other, and thus the plurality of first poles 3 are spaced from each other, so that the contact area between the first poles 3 and the second poles 5 is as large as possible, and the overcurrent capability of the unit cell 100 is improved.

The second poles 5 are provided in plurality, the second poles 5 are arranged at intervals in the first direction X, and the first poles 3 and the second poles 5 are connected in one-to-one correspondence. Increasing the number of the second poles 5 actually increases the overcurrent area, thereby improving the overcurrent efficiency of the battery module and improving the quick-charge performance of the battery pack as a whole. The plurality of second posts 5 are each located at the other end of the top cover 1 in the first direction X.

With this structure, the first pole 3 can be kept from interfering with and contacting with each other when the second pole 5 is connected.

In the present embodiment, the plurality of first poles 3 are arranged at intervals in the second direction Y.

The second pole 5 comprises a first body 51 and a contact part 52, the first body 51 is penetrated in the top cover 1, the contact part 52 is connected to one end of the first body 51 facing away from the shell 4 and extends along a second direction Y, and the extending directions of two adjacent contact parts 52 are facing away; the plurality of first poles 3 and the plurality of contact portions 52 are connected in one-to-one correspondence.

In this way, the adjacent two contact portions 52 can be shifted in the second direction Y, so that the adjacent two contact portions 52 are prevented from being contacted, and the adjacent two first poles 3 connected to the adjacent two contact portions 52 can be shifted, so that the adjacent two first poles 3 are prevented from being contacted.

In this embodiment, the first body 51 and the contact portion 52 of the second post 5 are integrally formed, and the first body 51 and the contact portion 52 are different portions of the second post 5 for different functions. The contact portion 52 and the first body 51 form a bending structure, that is, the second post 5 is bent along the second direction Y, and a portion of the bending extending along the second direction Y is the contact portion 52, and another portion is the first body 51.

In actual production, the second pole 5 is bent in the second direction Y to form the contact portion 52, thereby forming a surface for receiving the first pole 3, and after the first pole 3 and the contact portion 52 are connected, electrical connection between the adjacent two battery modules is achieved. Because the contact portion 52 is formed by bending, the difficulty of the manufacturing process can be reduced, and the implementation is easier.

The second body 32 of the first pole 3 and the converging portion 33 are also integrally formed, and the portion of the first pole 3 bent to extend in the second direction Y is overlapped on the contact portion 52 at the end portion, and the first pole 3 and the contact portion 52 are welded to form a connection between the first pole 3 and the second pole 5.

Similar to the second pole 5, the first pole 3 is also a bent bus portion 33, and the bus portion 33 is electrically connected to the contact portion of the second pole 5. Since the bus portion 33 is formed by bending, the difficulty of the manufacturing process can be reduced, and the implementation is easier.

The first pole 3 and the second pole 5 in this embodiment are arranged in a similar manner, except that the portion of the first pole 3 located outside the housing 4 is longer than the portion of the second pole 5 located outside the housing 4, and both the first pole 3 and the second pole 5 are bent in the second direction Y. The first pole 3 is longer and can be bent to the adjacent single battery 100, and the second pole 5 is shorter and can be positioned on the insulating member 3 after bending, and can not extend to the outside of the single battery 100 to which the first pole 3 belongs, and the contact portion 52 is used for receiving the first pole 3 from which the adjacent single battery 100 extends. Therefore, when the second pole 5 is provided, the extending directions of the adjacent two contact portions 52 are away from each other, and the arrangement of the first pole 3 corresponding thereto can be more appropriately adapted. Of course, in this arrangement, the lengths of two adjacent first poles 3 may also be set to be different.

In other embodiments, the first pole 3 and the second pole 5 may be bent along the second direction Y, and the directions of bending are opposite, and the first pole 3 and the second pole 5 may be bent onto adjacent unit cells 100. In the third direction Z, and in the view orientation shown in fig. 1, the first pole 3 is disposed above the second pole 5, or the second pole 5 is disposed above the first pole 3. At least a part of the overlapping position of the first pole 3 and the second pole 5 is located between two adjacent unit cells 300. The connection of the first pole 3 and the second pole 5 can also achieve the electrical connection of the adjacent two unit cells 300 to each other.

In this embodiment, the number of the first pole 3 and the second pole 5 is 2, and in other embodiments, the number of the first pole 3 and the second pole 5 may be set according to actual needs.

In some embodiments, along the third direction Z, the projection of the first pole 3 onto the plane of the contact 52 at least partially covers the contact 52.

With this configuration, the first pole 3 and the contact portion 52 can be overlapped, and the first pole 3 can be placed on the contact portion 52, thereby facilitating direct welding of the first pole 3 to the contact portion 52. The welding may be ultrasonic welding or laser welding.

The overlapping portion of the contact portion 52 and the first pole 3 has a length L in the second direction Y ₃ mm, the dimension of the unit cell 100 in the second direction Y is L ₂ mm, the dimension of the contact portion 52 in the third direction Z is D ₃ mm, satisfy: 4 is less than or equal to L ₃ ≤(1/2×L ₂ +2×D ₃ )。

Since the welding of the first pole 3 and the second pole 5 is located on the contact portion 52, then L ₃ The limit length required for welding needs to be considered, and if too small, the welding stability between the first pole 3 and the second pole 5 cannot be ensured, and if too large, the second pole 5 becomes too long. Thus at 4.ltoreq.L ₃ ≤(1/2×L ₂ +2×D ₃ ) In this range, the welding stability between the first pole 3 and the second pole 5 can be ensured, and the size of the second pole 5 can be set in a proper range.

In some embodiments, referring to fig. 2 and 10, the first pole 3 includes a second body 32 and a converging portion 33, the second body 32 is penetrating through the top cover 1, and the converging portion 33 is integrally connected to one end of the second body 32 far away from the housing 4, extends along the second direction Y, and is connected to the second pole 5 of the other one; in the second direction Y, the confluence portion 33 has a dimension L ₁ mm，The unit cell 100 has a size L ₂ mm, satisfy: l is more than 0.5 ₁ /L ₂ ＜2。

The second body 32 and the converging portion 33 of the first pole 3 are integrally formed, and the second body 32 and the converging portion 33 are different portions of the first pole 3 for different functions, respectively. The converging portion 33 and the second body 32 form a bending structure, that is, the first pole 3 is bent along the second direction Y, a portion of the bending extending along the second direction Y is the converging portion 33, and another portion is the second body 32.

If the bus bar portion 33 is excessively long, the end portion of the bus bar portion 33 may pass over the adjacent unit cells 100, and there is a risk of short circuit; if it is too short, it cannot extend to the second pole 5 of the adjacent unit cell 100, and the connection effect between the first pole 3 and the second pole 5 is affected. Thus at 0.5 < L ₁ /L ₂ In the range < 2, the process of the bus portion 33 can be prevented, the short-circuit risk can be reduced, and the connection effect between the first pole 3 and the second pole 5 can be ensured.

In measuring the dimension L ₁ And L ₂ In this case, the universal length measuring tool, such as a ruler or a tape measure, can be used.

Specifically, measure L ₁ At this time, the single battery 100 after the first pole 3 is bent is taken. Taking the end edge of the converging portion 33 in the second direction Y as a reference edge, measuring the distance between the reference edge and the edge at the bending position along the second direction Y by a length measuring tool, measuring a plurality of times and taking an average value to obtain the dimension L of the converging portion 33 along the second direction Y ₁ mm。

Measurement L ₂ In this case, the single battery 100 after the first pole 3 is bent may be taken, or the single battery 100 without the first pole 3 is taken. Taking one end face of the shell 4 in the second direction Y as a reference plane, measuring the distance between the reference plane and the other end face along the second direction Y by a length measuring tool, measuring for multiple times, and taking an average value to obtain a dimension L of the single battery 100 in the second direction Y ₂ mm。

In some embodiments, referring to fig. 2 and 10, the converging portion 33 is along the third direction ZSize D ₁ mm, dimension D in first direction X ₂ mm, satisfy: d is more than 0.01 ₁ /D ₂ ＜0.5。

If the confluence part 33 is too thick, the first pole 3 is difficult to bend, and the operation difficulty is high; if the bus portion 33 is too thin, the strength of the bus portion 33 itself is poor, and the welding of the bus portion 33 and the contact portion 52 is also not facilitated. Thus at 0.01 < D ₁ /D ₂ In the range of less than 0.5, the strength of the confluence part 33 itself can be ensured, the welding quality can be ensured, and the bending is easy.

In other embodiments, the following are satisfied: d is more than 0.08 and less than ₁ /D ₂ ＜0.3。

In measuring dimension D ₁ And D ₂ In this case, the universal length measuring tool, such as a ruler or a tape measure, can be used.

Specifically, measure D ₁ In this case, the single battery 100 after the first pole 3 is bent may be taken, or the single battery 100 without the first pole 3 is taken. Taking the bent single battery 100 in fig. 10 as an example, one end face of the converging portion 33 in the third direction Z is used as a reference face, the distance between the reference face and the other end face is measured in the third direction Z by a length measuring tool, and the distance is measured multiple times and averaged to obtain a dimension D of the converging portion 33 in the third direction Z ₁ mm。

Measurement D ₂ In this case, the single battery 100 after the first pole 3 is bent may be taken, or the single battery 100 without the first pole 3 is taken. Taking the bent single battery 100 in fig. 10 as an example, one end face of the confluence part 33 in the first direction X is used as a reference plane, the distance between the reference plane and the other end face is measured along the first direction X by a length measuring tool, and the distance is measured multiple times and averaged to obtain the dimension D of the confluence part 33 along the first direction X ₂ mm。

In some embodiments, referring to fig. 6 to 8, a surface of the insulating member 2 on a side facing away from the housing 4 in the third direction Z is provided with a void-avoiding groove 21 corresponding to the second post 5, and the second post 5 covers the void-avoiding groove 21.

In the present embodiment, the contact portion 52 on the second pole 5 is faced to the opening above the space-avoiding groove 21, preferably, the contact portion 52 is accommodated in the space-avoiding groove 21 and contacts with the bottom of the space-avoiding groove 21, so that the contact portion 52 is supported while lowering the height of the battery module in the third direction Z. When the first pole 3 and the second pole 5 are welded, the welding part is not in direct contact with the insulating part 2, and the arrangement of the empty slot 21 can slow down the heat transfer during welding so as to achieve the purpose of protecting the insulating part 2. The depth and specific dimensions of the clearance groove 21 may be set according to actual needs.

In some embodiments, referring to fig. 4 and 5, the first pole 3 includes a second body 32, a thinned portion 31 and a converging portion 33, the thinned portion 31 is connected between the second body 32 and the converging portion 33, the second body 32 is disposed through the top cover 2, and the converging portion 33 extends along the second direction Y and is connected with the second pole 5 of the other.

The thinned portion 31 is a transition portion between the second body 32 and the converging portion 33, and the thinned portion 31 is a bending portion, that is, the second body 32 and the converging portion 33 have the thinned portion 31 as a bending center. In some embodiments, the thickness of the thinned portion 31 may be smaller than the thickness of the converging portion 33 or smaller than the thickness of the second body 32, so that the thinned portion 31 can be bent conveniently, and the operation difficulty is reduced.

In other embodiments, the thinning portion 31 includes a third body connected between the second body 32 and the converging portion 33, and the third body is provided with a groove along at least one side of the second direction Y. The third body is used as a transition part between the second body 32 and the converging part 33, and the thickness of the third body is reduced by arranging a groove so as to facilitate bending of the first pole 3. The grooves may be provided on only one side in the second direction Y, or may be provided on both sides. The specific size and the position of the groove can be adaptively set according to actual needs. In this embodiment, the opening of the groove and the extension of the second body 32 are the same, so that the outer surface of the bent second post 5 is smooth and beautiful.

The embodiment also provides a battery pack, including foretell battery module, need not to set up the busbar among the prior art to simplify battery module's inner structure, reduce assembly parts, reduce the operation degree of difficulty, improve assembly efficiency, reduce economic cost.

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

1. A battery module having a first direction (X), a second direction (Y), and a third direction (Z) intersecting two by two, the battery module comprising:

a plurality of unit cells (100) arranged along the second direction (Y);

the single battery (100) comprises a shell (4), a top cover (1), a first pole (3) and a second pole (5), wherein the top cover (1) is arranged at one end of the shell (4) along the third direction (Z), and the first pole (3) and the second pole (5) are arranged on the top cover (1) at intervals along the first direction (X);

in two adjacent single batteries (100), a first pole (3) of one single battery extends at least partially along the second direction (Y) and is connected with the second pole (5) of the other single battery.

2. The battery module of claim 1, wherein:

the single battery (100) further comprises an insulating piece (2), the top cover (1) is provided with a through hole (11) penetrating along the third direction (Z), the through hole (11) is filled with the insulating piece (2), and the first pole (3) and the second pole (5) penetrate through the insulating piece (2).

3. The battery module of claim 1, wherein:

the number of the first polar columns (3) is plural, and the plurality of the first polar columns (3) are arranged at intervals in the first direction (X);

the second pole (5) is provided with a plurality of second poles (5) which are arranged at intervals in the first direction (X), and the first pole (3) and the second pole (5) are connected in one-to-one correspondence.

4. The battery module of claim 1, wherein:

the number of the first polar columns (3) is plural, and the plurality of the first polar columns (3) are arranged at intervals in the second direction (Y);

the second poles (5) are arranged in a plurality, the second poles (5) are arranged at intervals in the second direction (Y), the second poles (5) comprise a first body (51) and contact parts (52), the first body (51) is arranged in the top cover (1) in a penetrating mode, the contact parts (52) are connected to one end, deviating from the shell (4), of the first body (51) and extend along the second direction (Y), and the extending directions of two adjacent contact parts (52) deviate;

the plurality of first pole posts (3) and the plurality of contact parts (52) are connected in one-to-one correspondence.

5. The battery module according to claim 4, characterized in that, in the third direction (Z), the projection of the first pole (3) on the plane of the contact (52) at least partially covers the contact (52).

6. The battery module of claim 5, wherein the battery module comprises a plurality of battery cells,

the length of the overlapping part of the contact part (52) and the first pole (3) along the second direction (Y) is L ₃ mm, the dimension of the single battery (100) along the second direction (Y) is L ₂ mm, the dimension of the contact portion (52) along the third direction (Z) is D ₃ mm, satisfy: 4 is less than or equal to L ₃ ≤(1/2×L ₂ +2×D ₃ )。

7. The battery module of claim 1, wherein:

the first pole (3) comprises a second body (32) and a converging portion (33), wherein the second body (32) penetrates through the top cover (1), and the converging portion(33) Is integrally connected to one end of the second body (32) remote from the housing (4), and the other end extends along the second direction (Y) and is connected to the second post (5) of the other; in the second direction (Y), the confluence part (33) has a dimension L ₁ mm, the size of the single battery (100) is L ₂ mm, satisfy: l is more than 0.5 ₁ /L ₂ ＜2。

8. The battery module of claim 1, wherein:

the first pole (3) comprises a second body (32) and a converging part (33), the second body (32) penetrates through the top cover (1), one end of the converging part (33) is integrally connected with one end, far away from the shell (4), of the second body (32), and the other end extends along the second direction (Y) and is connected with the second pole (5) of the other one; the dimension of the confluence part (33) along the third direction (Z) is D ₁ mm, dimension D in the first direction (X) ₂ mm, satisfy: d is more than 0.01 ₁ /D ₂ ＜0.5。

9. The battery module of claim 2, wherein:

the surface of the insulating piece (2) on one side, which is away from the shell (4) in the third direction (Z), is provided with an empty avoidance groove (21) which is arranged corresponding to the second pole (5), and the second pole (5) covers the empty avoidance groove (21).

10. The battery module of claim 1, wherein:

the first pole (3) comprises a second body (32), a thinning part (31) and a converging part (33), the thinning part (31) is connected between the second body (32) and the converging part (33), the second body (32) is arranged on the top cover (1) in a penetrating mode, and the converging part (33) extends along the second direction (Y) and is connected with the second pole (5) of the other pole.

11. The battery module according to claim 10, wherein the thinned portion (31) comprises a third body connected between the second body (32) and the confluence portion (33), the third body being grooved along at least one side of the second direction (Y).

12. Battery pack, characterized in that it comprises a battery module according to any one of claims 1 to 11.