CN210743996U

CN210743996U - Secondary battery, battery module, battery pack, and device

Info

Publication number: CN210743996U
Application number: CN201921724162.4U
Authority: CN
Inventors: 陈雷
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2019-10-15
Filing date: 2019-10-15
Publication date: 2020-06-12
Anticipated expiration: 2029-10-15

Abstract

The embodiment of the utility model provides a secondary battery, battery module, group battery and device, secondary battery includes: the electrode unit comprises a main body part, a first tab and a second tab, wherein the first tab and the second tab extend out of the main body part; a housing having an accommodating chamber accommodating the main body portion and a first opening communicating with the accommodating chamber; the first cover plate is covered at the first opening and provided with a first abdicating hole which penetrates through the first cover plate, and the first pole lug passes through the first abdicating hole and is connected to one side of the first cover plate, which is far away from the accommodating cavity; and the sealing plate is connected to one side of the first cover plate, which deviates from the accommodating cavity, in a sealing manner and covers the first yielding hole. The utility model discloses a secondary battery passes first hole of stepping down with first utmost point ear and connects and deviate from the one side that holds the chamber in first apron, can reduce the space that utmost point ear occupy in the casing to improve secondary battery's energy density.

Description

Secondary battery, battery module, battery pack, and device

Technical Field

The utility model relates to an energy storage equipment technical field especially relates to a secondary battery, battery module, group battery and device.

Background

In a secondary battery, in order to increase the energy density of the secondary battery, an active material is generally contained in a case as much as possible, so as to improve the space utilization rate inside the case. A secondary battery generally includes a case hermetically coupled to a cap plate, an electrode unit located in the case and including a main body portion and a tab extending from the main body portion, the tab being electrically connected to the electrode terminal through another mechanical member (e.g., an interposer), and an electrode terminal. Under the condition that the internal space of the shell is not changed, the larger the volume of the main body part is, the more active materials are, however, the tab or other mechanical parts (such as an adapter sheet) positioned inside the shell occupy the internal space of the shell, so that the internal part of the shell cannot contain more active materials, and the energy density of the secondary battery is reduced.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a secondary battery, battery module, group battery and device aims at improving secondary battery's energy density.

The embodiment of the utility model provides a first aspect provides a secondary battery, include: the electrode unit comprises a main body part, a first tab and a second tab, wherein the first tab and the second tab extend out of the main body part; a housing having an accommodating chamber accommodating the main body portion and a first opening communicating with the accommodating chamber; the first cover plate is covered at the first opening and provided with a first abdicating hole which penetrates through the first cover plate, and the first pole lug passes through the first abdicating hole and is connected to one side of the first cover plate, which is far away from the accommodating cavity; and the sealing plate is connected to one side of the first cover plate, which deviates from the accommodating cavity, in a sealing manner and covers the first yielding hole.

According to one aspect of the present invention, the outer surface of the first cover plate facing away from the accommodating cavity is recessed toward the accommodating cavity and forms a first concave portion, the first concave portion has a bottom plate, and the first abdicating hole is located on one side of the bottom plate in the thickness direction of the secondary battery;

the first tab is provided with a connecting part and a fixing part, the fixing part is positioned in the first concave part and connected to the bottom plate, and the connecting part is bent relative to the fixing part and penetrates through the first yielding hole.

According to one aspect of the utility model, the number of the first abdicating holes is two, and the two first abdicating holes are positioned on the two sides of the bottom plate along the thickness direction;

the quantity of electrode unit is two, and two electrode unit set up side by side along the thickness direction to two electrode unit's respective first utmost point ears pass two first holes of stepping down respectively, and the fixed part of two first utmost point ears extends the shaping along the direction that is close to each other.

According to an aspect of the invention, the first cover plate has an inner surface facing the receiving chamber, the bottom plate protruding beyond the inner surface in a direction facing the receiving chamber.

According to an aspect of the present invention, the first concave portion has a first section and a second section distributed in succession in a height direction of the secondary battery, the first section is located on a side of the second section facing away from the accommodation chamber, and an orthographic projection of the second section in the height direction is located within an orthographic projection of the first section in the height direction;

at least part of the fixing portion is accommodated in the second section, and the sealing plate is accommodated in the first section.

According to an aspect of the invention, the first recess has a first side wall towards the first section and a second side wall towards the second section, the first side wall and the second side wall being interconnected by a transition portion, the sealing plate being located at a side of the transition portion facing away from the receiving cavity.

According to one aspect of the present invention, the edge of the sealing plate has a welding zone, and the first cover plate is provided with a reinforcing strip towards the inner surface of the accommodating cavity;

the orthographic projection of the reinforcing strips in the height direction of the electrode unit covers the orthographic projection of the welding area in the height direction.

According to the utility model discloses an aspect still includes the division board, and the division board is located between first apron and the main part, runs through on the division board and is provided with the second hole of stepping down, and first utmost point ear passes first hole and the second hole of stepping down.

According to the utility model discloses an aspect, the second hole of stepping down and the first orthographic projection of stepping down the hole in the direction of height of electrode unit at least partially overlap.

According to an aspect of the invention, the spacer has a first surface facing the first cover plate and a second surface facing the main body portion, the first surface being recessed towards the second surface and forming a second recess, at least part of the bottom plate being located in the second recess.

According to an aspect of the present invention, the secondary battery further includes a first electrode terminal electrically connected to the first tab and a second electrode terminal electrically connected to the second tab, the first electrode terminal is electrically connected to the first cover plate and the case, and the second electrode terminal is disposed in an insulating manner with the first cover plate and the case.

According to an aspect of the utility model, secondary battery still includes the second apron, the casing have with hold the second opening that the chamber communicates to second opening and first opening are located the casing respectively and follow the both ends of secondary battery direction of height, the second opening part is located to the second apron lid, first electrode terminal and second electrode terminal all set up in the second apron, first utmost point ear passes first apron, the casing in proper order, the second apron is connected with first electrode terminal electricity, the setting of second utmost point ear and second apron insulation.

The embodiment of the second aspect of the present invention also provides a battery module, including a plurality of the above-mentioned secondary batteries of the frame, a plurality of the secondary batteries are arranged side by side in the frame.

The third aspect of the embodiment of the present invention also provides a battery pack, which includes a case and the above-mentioned secondary battery located in the case.

A fourth aspect of the present invention provides a device using a secondary battery as a power source, including a housing portion and a plurality of the above-described secondary batteries located in the housing portion.

In the secondary battery according to an embodiment of the present invention, the secondary battery includes an electrode unit, a case, a first cover plate, and a sealing plate. The electrode unit is positioned in the shell, and a first tab of the electrode unit extends out of the first opening. The first cover plate cover is arranged at the first opening, so that the first pole lug penetrates through the first abdicating hole and is connected to one side of the first cover plate, which deviates from the accommodating cavity. Through passing first utmost point ear and stepping down the hole and connecting in the one side that first apron deviates from holding the chamber, can reduce the space that utmost point ear occupy in the casing to improve secondary battery's energy density.

Drawings

Other features, objects and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments thereof, when read in conjunction with the accompanying drawings, in which like or similar reference characters identify the same or similar features.

Fig. 1 is a schematic structural diagram of a vehicle according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a battery pack according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a battery module according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a secondary battery according to an embodiment of the present invention;

fig. 5 is an exploded view schematically illustrating a secondary battery according to an embodiment of the present invention;

FIG. 6 is a schematic view of a portion of the enlarged structure at I in FIG. 5;

fig. 7 is a front view of a secondary battery according to an embodiment of the present invention;

FIG. 8 is a cross-sectional view taken at A-A of FIG. 7;

FIG. 9 is a cross-sectional view taken at B-B of FIG. 7;

FIG. 10 is an enlarged partial schematic view of FIG. 9;

fig. 11 is a schematic structural view of a first cover plate of a secondary battery according to an embodiment of the present invention;

fig. 12 is a schematic structural view of a separator for a secondary battery according to an embodiment of the present invention.

Description of reference numerals:

1. a battery pack; 2. a vehicle main body;

11. a battery module; 12. a box body;

10. a secondary battery; 20. an accommodating portion; 21. an end plate; 22. a cuff; 23. a side plate;

100. an electrode unit; 110. a main body portion; 120. a first tab; 121. a connecting portion; 122. a fixed part; 130. a second tab;

200. a housing; 210. an accommodating chamber; 220. a first opening; 230. second opening

300. A first cover plate; 310. a first abdicating hole; 320. a first recess; 321. a base plate; 322. a first segment; 323. a second section; 324. a first side wall; 325. a second side wall; 326. a transition section; 330. an inner surface; 340. a reinforcing strip;

400. a sealing plate;

500. a separator plate; 510. a second abdicating hole; 520. a first surface; 530. a second surface; 540. a second recess;

600. a first electrode terminal;

700. a second electrode terminal;

800. and a second cover plate.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", and the like, indicate orientations or positional relationships only for convenience in describing the present invention and to simplify the description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, 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.

The directional terms appearing in the following description are directions shown in the drawings and do not limit the specific structure of the embodiments of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as either a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as the case may be, by those of ordinary skill in the art.

For better understanding of the present invention, the secondary battery, the battery module, the battery pack, and the device according to the embodiments of the present invention will be described in detail below with reference to fig. 1 to 12.

As shown in fig. 1, the embodiment of the present invention firstly provides a vehicle, which includes a vehicle body 2, a receiving portion provided in the vehicle body 2, and a battery pack 1, wherein the battery pack 1 is provided in the receiving portion.

Wherein, the vehicle is new energy automobile, and it can be pure electric automobile, also can hybrid vehicle or increase form car. The vehicle main body 2 is provided with a driving motor, the driving motor is electrically connected with the battery pack 1, the battery pack 1 provides electric energy, and the driving motor is connected with wheels on the vehicle main body 2 through a transmission mechanism so as to drive the automobile to move forward. Preferably, the battery pack 1 may be horizontally disposed at the bottom of the vehicle body 2.

Referring to fig. 2, the battery pack 1 may be disposed in various manners, and in some alternative embodiments, the battery pack 1 includes a case 12 and a battery module 11 disposed in the case 12.

The number of the battery modules 11 is one or more, and a plurality of the battery modules 11 are arranged in the case 12. The type of the case 12 is not limited, and the case 12 may be a frame-shaped case, a disc-shaped case, a box-shaped case, or the like, and particularly, the case 12 may include a lower case for accommodating the battery module and an upper case covering the lower case.

Referring to fig. 3, the battery module 11 may be disposed in various ways, and in some alternative embodiments, the battery module 11 includes a frame 20 and a plurality of secondary batteries 10 disposed in the frame 20, and the secondary batteries 10 are disposed side by side in the frame 20.

The frame 20 may be disposed in various manners, for example, the frame 20 includes a housing and a cover plate covering the housing; alternatively, the frame 20 comprises side plates 23 and end plates 21 which are successively coupled in a closed manner; alternatively, the frame 20 includes two end plates 21 disposed opposite to each other and a band 22 surrounding the end plates 21 and the exterior of the secondary battery 10; alternatively, as shown in FIG. 3, the frame 20 includes side plates 23, end plates 21, and a band 22.

The above-described arrangement of the battery pack 1 is not limited thereto, and in some alternative embodiments, the plurality of secondary batteries 10 may be directly arranged in the case 12 of the battery pack 1. The manner in which the plurality of secondary batteries 10 are disposed in the case 12 is not limited, and for example, the plurality of secondary batteries 10 are stacked in the height direction thereof in the case 12; alternatively, a plurality of secondary batteries 10 are arranged side by side in the case 12; alternatively, a part of the secondary batteries 10 may be stacked in the case 12, and another part of the secondary batteries 10 may be arranged side by side in the case 12, and so on.

It is understood that the secondary battery 10 may be applied not only to vehicles but also to other devices. The embodiment of the present invention also provides a device using the secondary battery 10 as a power source, which may be, but not limited to, a vehicle, a ship, an aircraft, or the like.

Referring to fig. 4 to 9, fig. 4 is a schematic structural diagram of a secondary battery 10 according to an embodiment of the present invention, fig. 5 is a schematic structural diagram of an explosion of the secondary battery 10 according to an embodiment of the present invention, and fig. 6 is a schematic structural diagram of a partial enlargement of fig. 5; fig. 7 is a front view of a secondary battery 10 according to an embodiment of the present invention; fig. 8 is a partially enlarged structural view at a-a in fig. 7, and fig. 9 is a sectional view at B-B in fig. 7.

The secondary battery 10 according to the embodiment of the present invention includes: an electrode unit 100 including a main body 110 and first and

second tabs

120 and 130 extending from the main body 110; a housing 200 having a housing chamber 210 for housing the body 110 and a first opening 220 communicating with the housing chamber 210; the first cover plate 300 covers the first opening 220, the first cover plate 300 has a first abdicating hole 310 penetrating therethrough, and the first tab 120 passes through the first abdicating hole 310 and is connected to a side of the first cover plate 300 away from the accommodating cavity 210; and the sealing plate 400 is hermetically connected to a side of the first cover plate 300 facing away from the accommodating cavity 210 and covers the first relief hole 310.

In the secondary battery 10 according to the embodiment of the present invention, the secondary battery 10 includes an electrode unit 100, a case 200, a first cover plate 300, and a sealing plate 400. The electrode unit 100 is located in the case 200, and the first tab 120 of the electrode unit 100 protrudes from the first opening 220. The first cover plate 300 covers the first opening 220, so that the first tab 120 passes through the first offset hole 310 and is connected to a side of the first cover plate 300 facing away from the accommodating cavity 210. Therefore, in the assembly process of the secondary battery 10 according to the embodiment of the present invention, after the first tab 120 passes through the first abdicating hole 310, the first tab 120 may be bent to make at least a part of the first tab 120 contact with the first cover plate 300, and then the first tab 120 is directly welded to the first cover plate 300, so that other mechanical members (such as an adaptor sheet) may be omitted, thereby reducing the production cost; moreover, when the first tab 120 is welded to the side of the first cover plate 300 away from the accommodating cavity 210, the occupied space of the first tab 120 in the housing 200 can be reduced, thereby improving the energy density; in addition, after the first tab 120 is welded to the first cover plate 300, the relative position relationship between the first tab 120 and the main body 110 does not need to be changed, and the probability of inserting the first tab 120 into the main body 110 can be reduced.

Therefore, the utility model discloses a secondary battery 10 not only can reduce the occupation space of first utmost point ear 120 in casing 200, can improve secondary battery 10's security performance moreover.

The secondary battery 10 further includes a first electrode terminal 600 electrically connected to the first tab 120 and a second electrode terminal 700 electrically connected to the second tab 130. The first electrode terminal 600 is electrically connected to the case 200, and the case 200 is electrically connected to the first cap plate 300, so that the first electrode terminal 600 is electrically connected to the first tab 120 through the case 200 and the first cap plate 300. The second electrode terminal 700 is insulated from the case 200 and the first cap plate 300.

In some alternative embodiments, the secondary battery 10 further includes a second cap plate 800 disposed opposite to the first cap plate 300. The housing 200 has a second opening 230 communicating with the accommodation chamber 210, and the first two openings 230 and the first opening 220 are respectively located on both sides of the housing 200 in the height direction (Z direction in fig. 4). The positions where the first electrode terminal 600 and the second electrode terminal 700 are disposed are not limited herein, and the first electrode terminal 600 and the second electrode terminal 700 may be disposed at the same side of the secondary battery 10. For example, the first electrode terminal 600 and the second electrode terminal 700 are simultaneously disposed at the first cap plate 300, or the first electrode terminal 600 and the second electrode terminal 700 are simultaneously disposed at the second cap plate 800. Or, in other alternative embodiments, the first electrode terminal 600 and the second electrode terminal 700 are separately disposed at two sides of the secondary battery 10, the first electrode terminal 600 and the second electrode terminal 700 are respectively disposed at the first cover plate 300 and the second cover plate 800, the first tab 120 is connected to the first electrode terminal 600 sequentially through the first cover plate 300, the case 200, and the second cover plate 800, and the second tab 130 is disposed in an insulating manner with respect to the second cover plate 800.

Referring to fig. 10, in some alternative embodiments, the first tab 120 includes a connection portion 121 and a fixing portion 122, the connection portion 121 is connected between the fixing portion 122 and the main body portion 110, the connection portion 121 is disposed through the first relief hole 310, the fixing portion 122 intersects with the connection portion 121, and the fixing portion 122 is connected to the outer surface of the first cover plate 300. The outer surface of the first cover plate 300 refers to the surface of the first cover plate 300 facing away from the accommodating cavity 210.

In these optional embodiments, the connecting portion 121 is bent relative to the fixing portion 122, and the connecting portion 121 is disposed through the first yielding hole 310, so that the first tab 120 can pass through the connecting portion 121 and be disposed through the first yielding hole 310, and the fixing portion 122 extends out of the first yielding hole 310 and is connected to the first cover plate 300.

In some alternative embodiments, please refer to fig. 11, the outer surface of the first cover plate 300 facing away from the receiving cavity 210 is recessed toward the receiving cavity 210 to form a first recess 320, the first recess 320 has a bottom plate 321, the first offset hole 310 is located on one side of the bottom plate 321 in the thickness direction (Y direction in fig. 4) of the secondary battery 10, the connection portion 121 of the first tab 120 is inserted through the first offset hole 310, and the fixing portion 122 is located in the first recess 320 and connected to the bottom plate 321. It is explained herein that, when the electrode unit 100 is a laminated structure, the electrode unit 100 is formed by stacking a plurality of pole pieces and separators, with the thickness direction of the secondary battery 10 coinciding with the stacking direction; when the electrode unit 100 is of a roll-to-roll structure, the electrode unit 100 is formed by rolling a pole piece and a separator, and the electrode unit 100 includes two flat surfaces and two narrow surfaces, where the flat surfaces are substantially flat surfaces, and where the thickness direction of the secondary battery 10 is a direction perpendicular to the flat surfaces.

In these alternative embodiments, the first cover plate 300 is formed with the first recess 320, and the fixing portion 122 of the first tab 120 is located in the first recess 320, so that the space occupied by the first tab 120 in the height direction (Z direction in fig. 4) can be reduced, the flatness of the outer surface of the first cover plate 300 can be improved, and the space occupied by the entire secondary battery 10 in the battery module can be reduced.

The number of the electrode units 100 in the housing 200 is not limited, and only one electrode unit 100 may be disposed in the housing 200, or in alternative embodiments, two electrode units 100 are disposed in the housing 200, and the two electrode units 100 are disposed side by side in the thickness direction. Correspondingly, the first cover plate 300 is provided with two first yielding holes 310, the two first yielding holes 310 are located at two sides of the bottom plate 321 in the thickness direction, the connecting portions 121 of the respective first tabs 120 of the two electrode units 100 respectively penetrate through the two first yielding holes 310, and the fixing portions 122 of the two first tabs 120 are formed in an extending manner in the direction of approaching each other.

The relative position relationship between the fixing portions 122 of the two first tabs 120 is not limited, and for example, the two fixing portions 122 are arranged side by side in the thickness direction, or the two fixing portions 122 are arranged in a stacked manner in the height direction, as long as the two fixing portions 122 are both located in the first recess 320.

The first concave portion 320 is not limited, for example, the extending depth of the first concave portion 320 in the height direction is greater than the extending thickness of the first cover 300 in the height direction, and the bottom plate 321 is disposed toward the inner surface 330 of the receiving cavity 210 protruding from the first cover 300 in the direction toward the receiving cavity 210.

In these alternative embodiments, the depth of the first recess 320 is deeper, which can increase the accommodating volume of the first recess 320, and ensure that the fixing portions 122 of the two first tabs 120 can be located in the first recess 320.

In further alternative embodiments, first recess 320 has a first section 322 and a second section 323 distributed one after the other in the height direction, first section 322 is located on the side of second section 323 facing away from receiving chamber 210, and the orthographic projection of second section 323 in the height direction is located within the orthographic projection of first section 322 in the height direction; at least part of the fixing portion 122 is received in the second section 323, and the sealing plate 400 is received in the first section 322.

In these alternative embodiments, the first recess 320 forms a second section 323 for accommodating the fixing part 122 and a first section 322 for accommodating the sealing plate 400, respectively, in the height direction. And the orthographic projection of the second section 323 in the height direction is located within the orthographic projection of the first section 322 in the height direction, i.e., the size of the first section 322 is larger than the size of the second section 323. It is possible to ensure that the sealing plate 400 completely covers the second section 323, and thus, the sealing plate 400 completely covers the first receding hole 310 and the fixing portion 122, and to improve the sealing performance of the secondary battery 10.

The sealing plate 400 may be received in the first section 322 in a variety of ways, such as by attaching the sealing plate 400 to a surface of the first recess 320 facing the first section 322.

Alternatively, in other alternative embodiments, the first recess 320 has a first sidewall 324 facing the first section 322 and a second sidewall 325 facing the second section 323, the first and

second sidewalls

324, 325 being interconnected by a transition 326, the seal plate 400 being located on a side of the transition 326 facing away from the receiving cavity 210.

In these alternative embodiments, the first recess 320 has a transition 326 connecting the first side wall 324 and the second side wall 325, the transition 326 being used to carry the sealing plate 400, so that the sealing plate 400 can be connected to the side of the transition 326 facing away from the receiving cavity 210. By providing the transition portion 326, it is possible to provide a load bearing to the sealing plate 400, improve the stability of the relative position between the sealing plate 400 and the first cover plate 300, and facilitate welding of the sealing plate 400 and the first cover plate 300.

There are various ways of forming first section 322 and second section 323, for example, second section 323 can be formed using a stamping process. There are various ways to arrange the first segment 322, for example, after the second segment 323 is formed by punching, the first segment 322 is formed by turning on the peripheral side of the second segment 323. As such, the transition 326 is formed by turning, and the thickness of the transition 326 in the height direction is small.

The sealing plate 400 and the transition portion 326 may be connected to each other in various ways, such as by bonding the sealing plate 400 and the transition portion 326 to each other.

Alternatively, in order to further improve the sealing performance, the sealing plate 400 and the transition portion 326 are welded to each other, the edge of the sealing plate 400 is formed with a welding region after the sealing plate 400 and the transition portion 326 are welded to each other, the inner surface 330 of the first cover plate 300 facing the receiving cavity 210 is provided with the reinforcing bar 340, and an orthographic projection of the reinforcing bar 340 in the height direction covers an orthographic projection of the welding region in the height direction.

The edges of the sealing plate 400 have a weld area that may cause the transition portion 326 to thermally deform and even to weld through during welding of the sealing plate 400. In these optional embodiments of the present invention, the reinforcing strip 340 is disposed on the transition portion 326 toward one side of the accommodating cavity 210, and the orthographic projection of the reinforcing strip 340 in the height direction covers the orthographic projection of the welding region in the height direction, that is, the size of the reinforcing strip 340 is greater than or equal to the size of the welding region, so as to improve the strength of the transition portion 326 and prevent the transition portion 326 from deforming in the welding process.

The mode of setting up of strengthening strip 340 has the multiple, for example strengthen strip 340 protrusion in the transition portion 326 and be close to the one side setting that holds chamber 210, strengthen the thickness that strip 340 can thicken the position of transition portion 326 through the setting, prevent that transition portion 326 from being heated the deformation and even weld and wear through. In other alternative embodiments, the reinforcing strip 340 is made of a high temperature resistant or high strength material, which can enhance the structural strength and high temperature resistance of the transition portion 326, thereby preventing the transition portion 326 from being deformed by heat and even welded through.

Referring to fig. 12, in some alternative embodiments, the secondary battery 10 further includes a separating plate 500, the separating plate 500 is located between the first cover plate 300 and the main body 110, a second yielding hole 510 is formed through the separating plate 500, and the first tab 120 passes through the first yielding hole 310 and the second yielding hole 510.

In these alternative embodiments, the insulation between the first cap plate 300 and the main body 110 can be ensured by providing the separator 500, thereby improving the safety of the secondary battery 10. When the secondary battery 10 includes the separator 500, the first tab 120 is disposed through the first and second yield holes 310 and 510, i.e., the connection part 121 is disposed through the first and second yield holes 310 and 510.

The relative position relationship between the first and second yielding

holes

310 and 510 is not limited herein, and in some alternative embodiments, orthographic projections of the second yielding hole 510 and the first yielding hole 310 in the height direction of the electrode unit 100 at least partially overlap. The connecting portion 121 formed to extend in the height direction can simultaneously pass through the first and second yielding

holes

310 and 510, so that the extending distance of the connecting portion 121 is reduced, and the size of the connecting portion 121 is reduced.

Further preferably, the sizes of the first and second yielding

holes

310 and 510 are matched with the connecting portion 121, so that the first and second yielding

holes

310 and 510 can provide limitation for the connecting portion 121, and stability of relative positions between the connecting portion 121 and the first cover plate 300 and the isolation plate 500 is ensured. At this time, orthographic projections of the first and second abdicating holes 310 and 510 in the height direction are overlapped.

Further preferably, in the thickness direction, the size of the second yielding hole 510 is smaller than the size of the first yielding hole 310, and the second yielding hole 510 is smaller, so that the root of the first tab 120 can be restrained, and the probability that the first tab 120 is inserted into the body 110 under a vibration condition is reduced.

The isolation plate 500 is not limited thereto, and in some alternative embodiments, the isolation plate 500 has a first surface 520 facing the first cover plate 300 and a second surface 530 facing the main body 110, the first surface 520 is recessed toward the second surface 530 to form a second recess 540, and at least a portion of the bottom plate 321 is located in the second recess 540.

In these alternative embodiments, the first surface 520 contacts the inner surface of the first cover plate 300, and the second surface 530 contacts the end surface of the main body 110 near the first cover plate 300, so that the separation plate 500 is fixed between the main body 110 and the first cover plate 300.

The second concave part 540 is formed on the isolation plate 500, and at least part of the bottom plate 321 is located in the second concave part 540, so that not only can the space occupied by the bottom plate 321 and the fixing part 122 in the height direction be reduced, but also the second concave part 540 can provide limitation for the bottom plate 321, the stability of the relative position between the bottom plate 321 and the second concave part 540 is ensured, the stability of the relative position between each part in the secondary battery 10 is further ensured, and the reliability of the secondary battery 10 is improved.

The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in the specific embodiments may be modified without departing from the basic spirit of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A secondary battery, characterized by comprising:

the electrode unit comprises a main body part, a first tab and a second tab, wherein the first tab and the second tab extend out of the main body part;

a housing having an accommodating chamber accommodating the main body portion and a first opening communicating with the accommodating chamber;

the first cover plate is covered at the first opening and provided with a first abdicating hole which penetrates through the first cover plate, and the first tab penetrates through the first abdicating hole and is connected to one side of the first cover plate, which is far away from the accommodating cavity;

and the sealing plate is connected with the first cover plate in a sealing mode, deviates from one side of the accommodating cavity and covers the first yielding hole.

2. The secondary battery according to claim 1,

the outer surface of the first cover plate, which is far away from the accommodating cavity, is sunken towards the accommodating cavity to form a first concave part, the first concave part is provided with a bottom plate, and the first avoiding hole is positioned on one side of the bottom plate along the thickness direction of the secondary battery;

the first tab is provided with a connecting part and a fixing part, the fixing part is located in the first concave part and connected to the bottom plate, and the connecting part is bent relative to the fixing part and penetrates through the first yielding hole.

3. The secondary battery according to claim 2,

the number of the first yielding holes is two, and the two first yielding holes are positioned on two sides of the bottom plate in the thickness direction;

the quantity of electrode unit is two, two the electrode unit is followed the thickness direction sets up side by side, and two the electrode unit is respective first utmost point ear passes two respectively first hole, two of stepping down first utmost point ear the fixed part is along the direction extension shaping that is close to each other.

4. The secondary battery according to claim 2, wherein the first cover plate has an inner surface facing the accommodation chamber, and the bottom plate is disposed protruding from the inner surface in a direction toward the accommodation chamber.

5. The secondary battery according to claim 2,

the first recess has a first section and a second section distributed in succession in a height direction of the secondary battery, the first section is located on a side of the second section facing away from the accommodation chamber, and an orthographic projection of the second section in the height direction is located within an orthographic projection of the first section in the height direction;

at least a portion of the fixing portion is received in the second section and the sealing plate is received in the first section.

6. The secondary battery according to claim 5, wherein the first recess has a first side wall facing the first segment, a second side wall facing the second segment, and a transition portion through which the first and second side walls are connected to each other, the sealing plate being located on a side of the transition portion facing away from the receiving cavity.

7. The secondary battery according to claim 5,

the edge of the sealing plate is provided with a welding area, the inner surface of the first cover plate facing the accommodating cavity is provided with a reinforcing strip, and the orthographic projection of the reinforcing strip in the height direction of the electrode unit covers the orthographic projection of the welding area in the height direction.

8. The secondary battery of any one of claims 2 to 7, further comprising a separator, wherein the separator is located between the first cover plate and the main body, a second yielding hole is formed in the separator in a penetrating manner, and the first tab passes through the first yielding hole and the second yielding hole.

9. The secondary battery according to claim 8, wherein orthographic projections of the second and first relief holes in a height direction of the electrode unit at least partially overlap.

10. The secondary battery according to claim 8, wherein the separator has a first surface facing the first cover plate and a second surface facing the main body portion, the first surface being recessed toward the second surface and forming a second recess, at least a portion of the bottom plate being located within the second recess.

11. The secondary battery according to claim 1, further comprising a first electrode terminal electrically connected to the first tab and a second electrode terminal electrically connected to the second tab, the first electrode terminal being electrically connected to the first cap plate and the case, and the second electrode terminal being insulated from the first cap plate and the case.

12. The secondary battery according to claim 11, wherein the secondary battery further comprises a second cover plate, the case has a second opening communicating with the accommodation chamber, and the second opening and the first opening are respectively located at two ends of the case in a height direction of the secondary battery, the second cover plate is covered at the second opening, the first electrode terminal and the second electrode terminal are both disposed on the second cover plate, the first tab is electrically connected to the first electrode terminal through the first cover plate, the case, and the second cover plate in sequence, and the second tab is disposed in an insulated manner from the second cover plate.

13. A battery module comprising a frame and a plurality of secondary batteries according to any one of claims 1 to 12, the plurality of secondary batteries being arranged side by side in the frame.

14. A battery pack characterized by comprising a case body and a plurality of secondary batteries according to any one of claims 1 to 12 in the case body.

15. An apparatus using a secondary battery as a power source, comprising a housing and a plurality of secondary batteries according to any one of claims 1 to 12 in the housing.