CN218919232U

CN218919232U - Battery cell

Info

Publication number: CN218919232U
Application number: CN202222504128.4U
Authority: CN
Inventors: 齐彬伟; 孙倩倩; 张璐璐
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2023-04-25
Anticipated expiration: 2032-09-21

Abstract

The utility model relates to the technical field of batteries, and provides a battery, which comprises: the battery shell is provided with a pole through hole; the pole comprises a main body part, a limiting part and a flanging part, at least part of the main body part is arranged in the pole through hole in a penetrating mode, the limiting part and the flanging part are connected to the circumferential outer surface of the main body part, and the limiting part and the flanging part are respectively positioned on the outer surface and the inner surface of the battery shell and are fixed on the battery shell; wherein, be provided with first recess on the main part, first recess is located the outside of battery case, along the first diapire of first recess towards the opening direction of first recess, and first diapire is compared the surface that the surface is closer to the main part and sets up first recess. The battery shell can be reliably clamped by the limit part and the flanging part through the polar post, so that the stability of connection between the polar post and the battery shell is reduced after the battery is used for a long time, and the safety usability of the battery is improved.

Description

Battery cell

Technical Field

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

Background

In the related art, the pole may be fixed to the battery case, but the connection stability between the pole and the battery case may be lowered after the battery is used for a long period of time.

Disclosure of Invention

The utility model provides a battery, which is used for improving the service performance of the battery.

The present utility model provides a battery comprising:

the battery shell is provided with a pole through hole;

the pole comprises a main body part, a limiting part and a flanging part, at least part of the main body part is arranged in the pole through hole in a penetrating mode, the limiting part and the flanging part are connected to the circumferential outer surface of the main body part, and the limiting part and the flanging part are respectively positioned on the outer surface and the inner surface of the battery shell and are fixed on the battery shell;

wherein, be provided with first recess on the main part, first recess is located the outside of battery case, along the first diapire of first recess towards the opening direction of first recess, and first diapire is compared the surface that the surface is closer to the main part and sets up first recess.

The battery provided by the embodiment of the utility model comprises the battery shell and the polar column, wherein the polar column is arranged on the battery shell, and the main body part of the polar column can be fixed on the battery shell through the limiting part and the flanging part, namely, the polar column can reliably clamp the battery shell through the limiting part and the flanging part, so that the reduction of the connection stability between the polar column and the battery shell after the battery is used for a long time is avoided, and the safe use performance of the battery is improved. And be provided with first recess on the main part, first recess is located battery housing's the outside, first diapire of first recess is higher than battery housing's surface, thereby can improve the structural strength of utmost point post, also can avoid the utmost point post to cause the influence to battery housing in the installation, and first recess can be as the lightening hole, with this weight that reduces the battery, thereby improve the energy density of battery, or, first recess can be used as the locating hole, so make things convenient for the location of busbar when follow-up battery is in groups, improve battery group's installation effectiveness.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views. Wherein:

fig. 1 is a partial schematic structure of a battery according to an exemplary embodiment;

fig. 2 is a schematic view showing a partial sectional structure of a battery according to an exemplary embodiment;

fig. 3 is a schematic view of a partially cross-sectional structure of a battery according to an exemplary embodiment;

fig. 4 is a partial structural schematic diagram of a battery cell of a battery according to an exemplary embodiment.

The reference numerals are explained as follows:

10. a battery case; 11. a post through hole; 12. an outer surface; 13. an inner surface; 20. a pole; 21. a main body portion; 211. a first groove; 2111. a first bottom wall; 212. a second groove; 2121. a second bottom wall; 22. a limit part; 23. a burring part; 30. a current collector; 31. a first portion; 32. a second portion; 40. a battery cell; 41. a cell body; 42. a first tab; 43. a second lug; 50. an insulating member.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is therefore to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present disclosure, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, as described in the example embodiments of the present disclosure, are described with the angles shown in the drawings, and should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

An embodiment of the present utility model provides a battery, referring to fig. 1 to 4, the battery includes: a battery case 10, a post through hole 11 being provided on the battery case 10; the pole 20, the pole 20 includes main body portion 21, limit portion 22 and flanging portion 23, at least part of main body portion 21 wears to locate in pole through-hole 11, limit portion 22 and flanging portion 23 are all connected to the circumference external surface of main body portion 21, limit portion 22 and flanging portion 23 are located surface 12 and internal surface 13 of battery case 10 respectively, and fix to battery case 10; wherein, the main body 21 is provided with a first groove 211, the first groove 211 is located outside the battery case 10, and the first bottom wall 2111 is located closer to the main body 21 than the outer surface 12 in the opening direction of the first groove 211 along the first bottom wall 2111 of the first groove 211, that is, the first bottom wall 2111 is higher than the outer surface 12.

The battery according to one embodiment of the utility model comprises a battery case 10 and a pole 20, wherein the pole 20 is arranged on the battery case 10, and a main body part 21 of the pole 20 can be fixed on the battery case 10 through a limit part 22 and a flanging part 23, namely, the pole 20 can reliably clamp the battery case 10 through the limit part 22 and the flanging part 23, so that the reduction of the connection stability between the pole 20 and the battery case 10 after the battery is used for a long time is avoided, and the safe use performance of the battery is improved. The main body portion 21 is provided with the first groove 211, the first groove 211 is located at the outer side of the battery housing 10, the first bottom wall 2111 of the first groove 211 is closer to the surface of the main body portion 21 than the outer surface 12, so that the structural strength of the pole 20 can be improved, the influence of the pole 20 on the battery housing 10 in the mounting process can be avoided, the first groove 211 can be used as a lightening hole, so that the weight of a battery is reduced, the energy density of the battery is improved, or the first groove 211 can be used as a positioning hole, so that the positioning of a busbar is facilitated when the subsequent batteries are grouped, and the mounting efficiency of the battery group is improved.

It should be noted that, when the pole 20 is used as an electrode lead-out terminal of the battery, it is necessary to ensure the mounting stability between the pole 20 and the battery case 10, so as to avoid the problem of connection failure during the use of the battery. In this example, the pole 20 is configured as the main body 21, the limiting portion 22 and the flanging portion 23, and the main body 21 is disposed in the pole through hole 11, the limiting portion 22 and the flanging portion 23 are both connected to the circumferential outer surface of the main body 21, and the limiting portion 22 and the flanging portion 23 are respectively located on the outer surface 12 and the inner surface 13 of the battery case 10, so that the limiting portion 22 and the flanging portion 23 can be fixed on the battery case 10, thereby reliably fixing the pole 20 on the battery case 10, and avoiding the pole 20 from being separated from the battery case 10.

As shown in fig. 2 and 3, the first bottom wall 2111 of the first groove 211 is denoted as a toward the opening direction of the first groove 211, the main body portion 21 is inserted into the post through hole 11, and the stopper portion 22 and the burring portion 23 are respectively located at the outer surface 12 and the inner surface 13 of the battery case 10, thereby achieving the clamping of the stopper portion 22 and the burring portion 23 to the battery case 10.

The limiting portion 22 and the flange portion 23 may directly contact the battery case 10, and when the electrode post 20 and the battery case 10 need to be arranged in an insulating manner, a coating may be provided on the limiting portion 22 and the flange portion 23, or a coating may be provided on the battery case 10, and the coating may be alumina (Al ₂ O ₃ ) Zirconium oxide (ZrO) ₂ ) And ceramic materials. The electrode post 20 and the battery case 10 may be electrically connected, and in this case, the insulation treatment between the electrode post 20 and the battery case 10 may not be performed.

Alternatively, the limiting portion 22 and the flanging portion 23 may contact the battery case 10 through other structures, so as to ensure that the pole 20 may be fixed on the battery case 10, for example, the battery further includes an insulating member 50, and the limiting portion 22 and the flanging portion 23 clamp the battery case 10 through the insulating member 50, as shown in fig. 2, so that not only the pole 20 is reliably fixed on the battery case 10, but also protection of the battery case 10 is achieved.

The insulator 50 can also seal the post through-hole 11 on the basis of insulating the post 20 from the battery case 10. The insulating member 50 may be an integrally formed structure, for example, the insulating member 50 may be an injection molded member, or the insulating member 50 may include an upper plastic member, a sealing member, and a lower plastic member, thereby achieving reliable insulation between the electrode post 20 and the battery case 10 and ensuring reliable sealing of the sealing member to the electrode post through hole 11.

In one embodiment, as shown in fig. 2 and 3, the body part 21 is provided with a second groove 212, at least part of the second groove 212 being located inside the battery case 10; the minimum distance between the second bottom wall 2121 of the second groove 212 and the end surface of the main body portion 21 located outside the battery case 10 is smaller than the minimum distance between the flange portion 23 and the end surface of the main body portion 21 located outside the battery case 10, so that the risk that the flange portion 23 pulls the main body portion 21 in the process of forming the flange portion 23 can be avoided, and the stress at the joint of the flange portion 23 and the main body portion 21 is concentrated and the pole 20 is broken can be avoided, so that the structural safety performance of the pole 20 is improved.

As shown in connection with fig. 3, the minimum distance between the second bottom wall 2121 of the second groove 212 and the end surface of the body portion 21 located outside the battery case 10 may be denoted as a, and the minimum distance between the burring portion 23 and the end surface of the body portion 21 located outside the battery case 10 may be denoted as b, and b is greater than a, such that the second bottom wall 2121 of the second groove 212 may be closer to the top end of the body portion 21 than the top end of the burring portion 23.

Note that, the stopper portion 22 and the burring portion 23 are both connected to the circumferential outer surface of the main body portion 21, so that it is considered that the stopper portion 22 and the burring portion 23 may be both extended in the radial direction of the main body portion 21, the stopper portion 22 may be a structure formed in the process of manufacturing the post 20, and the burring portion 23 may be formed by burring after the post 20 is mounted on the battery case 10, or the stopper portion 22 and the burring portion 23 may be both formed by burring after the post 20 is mounted on the battery case 10. The minimum distance a between the second bottom wall 2121 and the end surface of the main body portion 21 located outside the battery case 10 is smaller than the minimum distance b between the flange portion 23 and the end surface of the main body portion 21 located outside the battery case 10, so that the structural damage of the pole 20 caused by excessive force of the flange portion 23 pulling the main body portion 21 during the flange riveting process can be avoided.

In one embodiment, the distance between the second bottom wall 2121 of the second groove 212 and the inner surface 13 is smaller than the distance between the surface of the flange portion 23 near the inner surface 13 and the inner surface 13, so that the risk that the flange portion 23 pulls the main body portion 21 during the process of forming the flange portion 23, so that the stress at the joint of the flange portion 23 and the main body portion 21 is concentrated relatively and the risk that the pole 20 breaks is avoided, and excessive pressure is transmitted to the battery case 10 during the flange riveting process of the flange portion 23, so that the battery case 10 is damaged can be avoided.

In one embodiment, the area of the first bottom wall 2111 is smaller than the area of the second bottom wall 2121, which may allow the second recess 212 to conveniently accommodate the current collector 30 while ensuring the structural strength of the pole 20, thereby ensuring a reliable connection between the pole 20 and the current collector 30.

In one embodiment, the ratio of the area of the first bottom wall 2111 to the area of the second bottom wall 2121 is 0.5% -70%, and on the basis of ensuring that the pole 20 has sufficient structural strength, the first recess 211 and the second recess 212 can be appropriately sized so that the first recess 211 can be used as a lightening hole and a positioning hole, and the second recess 212 can be used to accommodate the current collector 30.

The ratio of the area of the first bottom wall 2111 to the area of the second bottom wall 2121 may be 0.5%, 0.6%, 0.7%, 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 66%, 67%, 68%, 69%, or 70%, etc.

It should be noted that the main body 21 may have a cylindrical structure, the limiting portion 22 may have a circular ring structure, and the flange portion 23 may have a circular ring structure. The first recess 211 may be in the form of a circular hole, a conical hole, a frustoconical hole, etc., without limitation, and the second recess 212 may be generally circular. The first groove 211 may be used for positioning and connecting the bus bars when the batteries are grouped, and the first groove 211 may be used for positioning and connecting the bus bars, for example, protrusions may be disposed on the bus bars, and the protrusions are located in the first groove 211, so that efficient positioning of the bus bars may be achieved.

In one embodiment, the ratio of the depth of the first recess 211 to the depth of the second recess 212 is 1% -60%, so that the sufficient structural strength of the pole 20 can be ensured, and the moderate depths of the first recess 211 and the second recess 212 can be ensured. While the first grooves 211 may serve as lightening holes and positioning holes, and the second grooves 212 may serve to effectively receive the current collector 30, thereby improving the safety performance of the battery.

The ratio of the depth of the first grooves 211 to the depth of the second grooves 212 may be 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 56%, 57%, 58%, 59%, 60%, or the like.

In one embodiment, as shown in fig. 2, the battery further includes a current collector 30, at least a portion of the current collector 30 being positioned within the second recess 212 to connect with the terminal 20, thereby enabling the cell to connect with the terminal 20 through the current collector 30.

A portion of the current collector 30 may be positioned in the second recess 212 or the entire current collector 30 may be positioned in the second recess 212 on the basis of ensuring that the tab of the battery can be connected to the current collector 30.

In one embodiment, as shown in fig. 2, the current collector 30 includes a first portion 31 and a second portion 32, the second portion 32 protrudes from the first portion 31 to be located in the second groove 212, the first portion 31 is located at the outer side of the second groove 212, the second portion 32 can be conveniently connected with the pole 20, and the first portion 31 can be conveniently connected with the tab of the battery cell, thereby improving the assembly efficiency of the battery.

The second portion 32 is provided protruding from the first portion 31, for example, by punching a protrusion on a flat plate structure, thereby forming the second portion 32 on the first portion 31. Alternatively, a protrusion is provided on a flat plate, thereby forming the second portion 32 on the first portion 31.

In one embodiment, the second portion 32 contacts the second bottom wall 2121 to ensure that the current collector 30 is in reliable contact with the pole 20 and also to facilitate subsequent welding of the current collector 30 to the pole 20 to ensure overcurrent capability between the current collector 30 and the pole 20.

It should be noted that the current collector 30 and the pole 20 may be connected by welding, or the current collector 30 and the pole 20 may be connected by conductive adhesive, or the current collector 30 and the pole 20 may be connected by contact only, for example, the second portion 32 contacts the second bottom wall 2121, the second portion 32 contacts the side wall of the second groove 212, the first portion 31 contacts the pole 20, or the like.

In one embodiment, the ratio of the height of the second portion 32 protruding from the first portion 31 to the maximum thickness of the current collector 30 is 1.5-20, the current collector 30 and the pole 20 are ensured to have a sufficient connection, the current passing capability between the current collector 30 and the pole 20 is ensured, and the current collector 30 can be ensured to have a reliable structural strength.

The ratio of the height of the second portion 32 protruding from the first portion 31 to the maximum thickness of the current collector 30 is too small, resulting in too small a height of the first portion 31 of the current collector 30 affecting the strength of the electrical connection of the current collector 30 to the pole 20, resulting in a large gap between the current collector 30 and the pole 20 and a large interface contact resistance. The ratio of the height of the second portion 32 protruding from the first portion 31 to the maximum thickness of the current collector 30 is too large, so that the thickness of the current collector 30 is too large, the welding strength between the subsequent tab and the battery cell is affected, and the molding difficulty of the first portion 31 is increased.

The ratio of the height of the second portion 32 protruding from the first portion 31 to the maximum thickness of the current collector 30 may be 1.5, 1.6, 1.7, 1.8, 2, 2.5, 3, 3.5, 4, 4.5, 5, 6, 7, 8, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 14.6, 14.8, 14.9, 15, 16, 17, 18, 19, 19.5, 19.6, 19.7, 19.8, 19.9, or 20, etc.

In one embodiment, the second portion 32 is formed by stamping, which not only is simple to form, but also can improve the manufacturing efficiency of the current collector 30 and ensure that the current collector 30 has a high structural strength, and when the thickness of the current collector 30 is large, the difficulty of forming the second portion 32 by stamping increases, so that the ratio of the height of the protruding first portion 31 of the second portion 32 to the maximum thickness of the current collector 30 cannot be excessively large.

The current collector 30 may be a flat plate structure in which a protrusion is formed by punching in the middle thereof, that is, the flat plate structure is formed with the first and

second portions

31 and 32.

In one embodiment, the ratio of the depth of the second recess 212 to the height of the post 20 is 10% -90% along the depth of the second recess 212, so that the depth of the second recess 212 can be ensured to be moderate, and the reliable connection between the current collector 30 and the post 20 can be ensured without affecting the structural strength of the post 20.

When the ratio of the depth of the second groove 212 to the height of the post 20 is too large, the height of the second portion 32 needs to be large, which affects the stability of the electrical connection between the current collector 30 and the post 20, and when the ratio of the depth of the second groove 212 to the height of the post 20 is too small, the too small depth of the second groove 212 causes tearing between the burring 23 and the body 21 to seriously affect the structural strength of the post 20.

The ratio of the depth of the second recess 212 to the height of the pole 20 may be 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 56%, 57%, 58%, 59%, 60%, 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, or the like.

As shown in connection with fig. 3, the depth direction of the second groove 212 may be parallel to the first bottom wall 2111 of the first groove 211 toward the opening direction a of the first groove 211. The depth direction of the second groove 212 may also be denoted as a.

In one embodiment, as shown in fig. 2 and 4, the battery further includes a battery cell 40, where the battery cell 40 is disposed in the battery case 10, and the battery cell 40 includes a battery cell main body 41, a first tab 42, and a second tab 43, where the first tab 42 and the second tab 43 extend from at least one side of the battery cell main body 41; the first tab 42 is connected with the current collector 30, and the second tab 43 is electrically connected with the battery case 10, so that the battery case 10 and the electrode post 20 can be used as two electrode terminals, thereby facilitating connection of the battery and the bus bar when the battery is grouped. The polarities of the first tab 42 and the second tab 43 are opposite.

The first tab 42 may be electrically connected to the post 20 through the current collector 30, the second tab 43 may be directly electrically connected to the battery case 10, or the second tab 43 may be electrically connected to the battery case 10 through a structure similar to the current collector 30.

It should be noted that, the first tab 42 and the second tab 43 may extend from the same side of the battery main body 41, and the battery may also include two poles, which may be disposed on the same side of the battery case 10. One of the two poles is a positive pole, the other is a negative pole, and one of the first lug 42 and the second lug 43 is a positive pole, the other is a negative pole, the positive pole can be electrically connected with the positive pole, and the negative pole can be electrically connected with the negative pole.

The first tab 42 and the second tab 43 extend from the same side of the battery core main body 41, so that the utilization rate of the whole space inside the battery can be improved, the electrode post 20 and the battery shell 10 can be used as two electrode leading-out ends of the battery, connection during subsequent battery grouping can be facilitated, the area of the battery shell 10 is relatively large, and the reliable overcurrent area during battery grouping can be ensured, so that the whole charge and discharge rate of the battery is ensured.

Alternatively, the first tab 42 and the second tab 43 may extend from opposite sides of the battery core body 41, the battery may also include two poles, which may be disposed on opposite sides of the battery case 10, one of the two poles is a positive pole, the other is a negative pole, and one of the first tab 42 and the second tab 43 is a positive pole, the other is a negative pole, the positive pole may be electrically connected to the positive pole, and the negative pole may be electrically connected to the negative pole.

In one embodiment, the depth of the second groove 212 is 0.5mm-5mm, which can facilitate the connection of the current collector 30 and the pole 20 and improve the assembly strength of the current collector 30 and the pole 20 on the basis of ensuring the structural strength of the pole 20.

The depth of the second groove 212 may be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, or the like.

In one embodiment, the ratio of the depth of the second recess 212 to the thickness of the burring 23 is 1-5 along the depth direction of the second recess 212, so that the depth of the second recess 212 may be not less than the thickness of the burring 23, the second recess 212 may sufficiently accommodate the current collector 30, ensure the connection strength of the current collector 30 and the post 20, and may ensure the connection strength between the burring 23 and the battery case 10.

When the ratio of the depth of the second groove 212 to the thickness of the burring 23 is greater than 5, the depth of the second groove 212 is excessively large, resulting in lower overall structural strength of the post 20 and reduced assembly strength of the post 20 with the battery case 10. And when the ratio of the depth of the second groove 212 to the thickness of the burring 23 is less than 1, insufficient cushioning of the burring 23 may occur, and the pole 20 may easily break during assembly.

The ratio of the depth of the second groove 212 to the thickness of the burring 23 may be 1, 1.1, 1.2, 1.3, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 4.6, 4.8, 4.9, or 5, etc.

The depth of the second groove 212 may be denoted as d1, the thickness of the burring portion 23 may be denoted as d2, and the following table is a burring riveting force test table given for the different embodiments:

as can be seen from the above table, when the ratio of the depth of the second groove 212 to the thickness of the burring portion 23 is 1 to 5, it is possible to ensure that the caulking force of the burring portion 23 during the burring caulking is controlled to be 800N to 2000N, so that the burring of the burring portion 23 can be facilitated on the basis of ensuring the caulking mounting strength between the burring portion 23 and the battery case 10, thus satisfying the structural requirements of the battery, for example, the above table embodiment 1 to embodiment 13.

For example, in comparative examples 1 to 3, when the burring riveting force is more than 2000N, the caulking of the burring portion 23 is not facilitated, and the main body portion 21 is easily pulled; in contrast, in comparative examples 4 and 5, when the burring rivet force is less than 800N, the mounting strength between the burring 23 and the battery case 10 cannot be ensured, and thus, the above-indicated comparative examples 1 to 5 do not satisfy the structural requirements of the battery.

In one embodiment, the second bottom wall 2121 is not higher than the inner surface 13 in the direction in which the opening of the second groove 212 faces the second bottom wall 2121, i.e., the second bottom wall 2121 is located below the inner surface 13, so that the burring 23 can be prevented from affecting the overall structural strength of the battery case 10, for example, the risk of occurrence of seal failure of the insulator 50 for sealing the battery case 10.

In one embodiment, the second bottom wall 2121 is higher than the inner surface 13 along the direction of the opening of the second groove 212 toward the second bottom wall 2121, i.e., the second bottom wall 2121 is located above the inner surface 13, so that the welding difficulty between the post 20 and the current collector 30 can be reduced, thereby improving the manufacturing efficiency of the battery.

In one embodiment, the distance between the second bottom wall 2121 and the inner surface 13 is less than or equal to 3mm, so that the second groove 212 can be ensured to have a reliable depth, and the thickness between the first bottom wall 2111 and the second bottom wall 2121 can be properly reduced on the basis of ensuring the height of the pole 20, thereby facilitating the welding between the pole 20 and the current collector 30.

When the second bottom wall 2121 is disposed beyond the inner surface 13, the second bottom wall 2121 is spaced too far from the inner surface 13, the battery case 10 is severely deformed by the process of assembling the burring portion 23, which affects the overall sealing performance of the battery, and the current collector 30 protrudes too high, which results in a large overall thickness of the current collector 30, which affects the overall volumetric energy density of the battery. When the second bottom wall 2121 does not exceed the inner surface 13, the second bottom wall 2121 is too far from the inner surface 13, resulting in a large overall thickness of the burring portion 23, severe burring deformation is at risk of failure, and meanwhile, the large overall thickness of the post 20 affects the energy density of the battery.

It should be noted that, the direction of the opening of the second groove 212 toward the second bottom wall 2121 is opposite to the direction a, and referring to fig. 3 as an auxiliary drawing, the second bottom wall 2121 of the second groove 212 may be located below the inner surface 13, the second bottom wall 2121 of the second groove 212 may be located above the inner surface 13, for example, the second bottom wall 2121 of the second groove 212 may be located between the inner surface 13 and the outer surface 12, or the second bottom wall 2121 of the second groove 212 may be located above the outer surface 12.

In one embodiment, in the opening direction of the first bottom wall 2111 toward the first groove 211, the orthographic projections of the first groove 211 and the burring 23 toward the outer surface 12 do not coincide, so that the overall structural strength of the post is prevented from being damaged due to the oversized first groove 211, and the risk of breakage due to local stress concentration during the assembly process of the burring 23 and the battery case 10 can be avoided.

In one embodiment, the pole 20 may be made of a conductive material, for example, the pole 20 may be a metal material, and the pole 20 may be a copper pole, an aluminum pole, or a copper aluminum composite pole.

The current collector 30 may be made of a conductive material, and further, the current collector 30 may be an aluminum, copper or aluminum copper composite structure, or the like. The specific structural form of the current collector 30 is not limited, and may be determined according to actual requirements.

In one embodiment, the battery case 10 is provided with a liquid injection hole and an explosion-proof valve, which may be located on the same side of the battery case 10, and the post 20 may be located on opposite sides of the battery case 10 from the explosion-proof valve.

In one embodiment, the battery housing 10 may include a first housing member and a second housing member that are coupled to seal the cells 40. The first housing part may be formed with a receiving space, and the second housing part may be a cover plate on which the pole 20 may be disposed. Alternatively, the first housing member and the second housing member may each be formed with an accommodation space.

The first housing member comprises steel and the second housing member comprises steel. Alternatively, the first housing member comprises aluminum and the second housing member comprises aluminum. The first housing member may comprise a composite metal material, for example, the first housing member may comprise a copper aluminum composite material, and the second housing member may comprise a composite metal material, for example, the second housing member may comprise a copper aluminum composite material.

The first and second housing parts may be welded or the first and second housing parts may be riveted.

It is to be noted that a battery includes an electric core and an electrolyte, and is a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion comprises a first pole piece, a separator and a second pole piece. When the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. Wherein the polarities of the first pole piece and the second pole piece can be interchanged. The first and second pole pieces are coated with an active substance.

In one embodiment, the battery may be a square battery, that is, the battery may be a quadrangular battery, where the quadrangular battery mainly refers to a prismatic shape, but it is not strictly limited whether each side of the prism is necessarily a strictly defined straight line, and corners between sides are not necessarily right angles, and may be arc transitions.

The battery can be a laminated battery, so that the battery is not only convenient to group, but also long in length. Specifically, the battery cell is a laminated battery cell, and the battery cell is provided with a first pole piece, a second pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece, which are mutually laminated, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form the laminated battery cell.

Alternatively, the battery may be a wound battery in which a first pole piece, a second pole piece opposite in electrical property to the first pole piece, and a separator sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery cell.

In one embodiment, the battery may be a cylindrical battery. The battery can be a winding type battery, namely, a first pole piece, a second pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece are wound to obtain a winding type battery cell.

An embodiment of the present utility model also provides a battery pack including the above battery.

The battery pack according to one embodiment of the present utility model includes a battery including a battery case 10 and a post 20, the post 20 being disposed on the battery case 10, and a main body portion 21 of the post 20 being fixed to the battery case 10 through a stopper portion 22 and a burring portion 23, i.e., the post 20 being capable of reliably clamping the battery case 10 through the stopper portion 22 and the burring portion 23, thereby preventing a decrease in connection stability between the post 20 and the battery case 10 after the battery is used for a long time, and thus improving safety performance of the battery. The main body 21 is provided with the first groove 211, the first groove 211 is located at the outer side of the battery housing 10, the first bottom wall 2111 of the first groove 211 is higher than the outer surface 12 of the battery housing 10, so that the structural strength of the pole 20 can be improved, the influence of the pole 20 on the battery housing 10 in the mounting process can be avoided, the first groove 211 can be used as a lightening hole, so that the weight of a battery is reduced, the energy density of the battery is improved, or the first groove 211 can be used as a positioning hole, so that the positioning of a busbar is facilitated when the subsequent batteries are grouped, and the mounting efficiency of the battery group is improved.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of batteries, and the battery can be square battery, and the battery module can also include end plate and curb plate, and end plate and curb plate are used for fixed a plurality of batteries. The battery may be a cylindrical battery, the battery module may further include a bracket, and the battery may be fixed to the bracket.

The battery pack comprises a plurality of batteries and a box body, wherein the box body is used for fixing the plurality of batteries.

It should be noted that the battery pack includes a plurality of batteries, and a plurality of batteries are disposed in the case. Wherein, a plurality of batteries can be installed in the box after forming the battery module. Or, a plurality of batteries can be directly arranged in the box body, namely, the plurality of batteries do not need to be grouped, and the plurality of batteries are fixed by the box body.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery, comprising:

a battery case (10), wherein a post through hole (11) is formed in the battery case (10);

the battery comprises a pole (20), wherein the pole (20) comprises a main body part (21), a limiting part (22) and a flanging part (23), at least part of the main body part (21) is arranged in the pole through hole (11) in a penetrating mode, the limiting part (22) and the flanging part (23) are connected to the circumferential outer surface of the main body part (21), and the limiting part (22) and the flanging part (23) are respectively positioned on the outer surface (12) and the inner surface (13) of the battery shell (10) and are fixed on the battery shell (10);

wherein, be provided with first recess (211) on main part (21), first recess (211) are located the outside of battery case (10), along first diapire (2111) of first recess (211) is towards in the opening direction of first recess (211), first diapire (2111) is more close to than surface (12) main part (21) sets up the surface of first recess (211).

2. The battery according to claim 1, characterized in that the main body portion (21) is provided with a second groove (212), at least part of the second groove (212) being located inside the battery housing (10);

wherein a distance between a second bottom wall (2121) of the second groove (212) and the inner surface (13) is smaller than a distance between a surface of the burring (23) near the inner surface (13) and the inner surface (13).

3. The battery according to claim 2, wherein an area of the first bottom wall (2111) is smaller than an area of the second bottom wall (2121);

wherein the ratio of the area of the first bottom wall (2111) to the area of the second bottom wall (2121) is 0.5% -70%.

4. The battery according to claim 2, characterized in that the ratio of the depth of the first recess (211) to the depth of the second recess (212) is 1% -60%.

5. The battery of claim 2, further comprising a current collector (30), at least a portion of the current collector (30) being positioned within the second recess (212) for connection with the post (20).

6. The battery according to claim 5, wherein the current collector (30) comprises a first portion (31) and a second portion (32), the second portion (32) being arranged protruding from the first portion (31) to be located within the second recess (212), the first portion (31) being located outside the second recess (212);

wherein the second portion (32) is in contact with the second bottom wall (2121).

7. The battery according to claim 6, characterized in that the ratio of the height of the second portion (32) protruding from the first portion (31) to the maximum thickness of the current collector (30) is 1.5-20.

8. The battery according to claim 7, characterized in that the second portion (32) is stamped and formed.

9. The battery according to claim 6, characterized in that the ratio of the depth of the second groove (212) to the height of the post (20) is 10% -90% in the depth direction of the second groove (212).

10. The battery according to claim 6, further comprising a battery cell (40), the battery cell (40) being disposed within the battery housing (10), the battery cell (40) comprising a cell body (41), a first tab (42) and a second tab (43), the first tab (42) and the second tab (43) extending from at least one side of the cell body (41);

wherein the first tab (42) is connected with the current collector (30), and the second tab (43) is electrically connected with the battery case (10).

11. The battery according to any one of claims 2 to 10, characterized in that the depth of the second groove (212) is 0.5mm-5mm.

12. The battery according to any one of claims 2 to 10, characterized in that a ratio of a depth of the second groove (212) to a thickness of the burring (23) is 1-5 in a depth direction of the second groove (212).

13. The battery according to any one of claims 2 to 10, wherein the second bottom wall (2121) is not higher than the inner surface (13) in a direction in which an opening of the second recess (212) is directed toward the second bottom wall (2121).

14. The battery according to any one of claims 2 to 10, wherein the second bottom wall (2121) is higher than the inner surface (13) in a direction in which an opening of the second recess (212) is directed toward the second bottom wall (2121).

15. The battery according to claim 14, characterized in that the distance of the second bottom wall (2121) from the inner surface (13) is 3mm or less.

16. The battery according to any one of claims 1 to 10, characterized in that in the opening direction of the first bottom wall (2111) toward the first groove (211), the orthographic projections of the first groove (211) and the burring (23) toward the outer surface (12) do not coincide.

17. The battery according to any one of claims 1 to 10, further comprising an insulating member (50), wherein the stopper portion (22) and the burring portion (23) sandwich the battery case (10) through the insulating member (50).

18. The battery according to any one of claims 1 to 10, wherein the battery is a cylindrical battery.