CN116454565A - Battery cell - Google Patents

Abstract

The application provides a battery comprising a housing, an electrical core, and a transition piece; the battery cell is arranged in the shell, the end wall of the shell is arranged at intervals with the battery cell body of the battery cell, the end wall is provided with an opening, the transition piece is arranged between the end wall and the battery cell body, the transition piece is fixedly connected with the end wall, and the projection of the transition piece on the end wall is at least partially overlapped with the projection of the opening on the end wall; wherein, be provided with a plurality of intercommunicating pore on the transition piece, intercommunicating pore intercommunication trompil and the inside of casing. When the battery is in the subsequent processing, the transition piece can play a role in blocking electrolyte in the shell, so that the overflow of the electrolyte is reduced, the performance of the battery is improved, and the pollution of the periphery of the opening hole caused by the overflow electrolyte is reduced to influence the connection between the sealing piece and the shell.

Description

Battery cell

Technical Field

The application relates to the technical field of battery energy, in particular to a battery.

Background

The battery is an energy device with wide application, and plays a great role in various aspects of modern society life. With the development of technology, the requirements on the performance such as the tightness, the safety and the like of the battery are also higher and higher.

Currently, a battery includes a housing with an opening provided therein and a battery cell mounted in the housing. After the battery cell is assembled with the shell, electrolyte is injected into the shell through the opening, and after subsequent processing, such as formation and capacity division, the opening is sealed by using a sealing sheet to seal the shell of the battery. However, part of the electrolyte overflows during the subsequent processing of the battery, which affects the performance of the battery and results in poor connection between the sealing plate and the case.

Disclosure of Invention

Based on this, this application provides a battery to there is partial electrolyte excessive in the in-process of follow-up processing of battery, influences the performance of battery and leads to the poor problem of connection between sealing washer and the casing.

The battery comprises a shell, an electric core and a transition piece;

the battery cell is arranged in the shell, the end wall of the shell is arranged at intervals with the battery cell body of the battery cell, the end wall is provided with an opening, the transition piece is arranged between the end wall and the battery cell body, the transition piece is fixedly connected with the end wall, and the projection of the transition piece on the end wall is at least partially overlapped with the projection of the opening on the end wall;

wherein, be provided with a plurality of intercommunicating pore on the transition piece, intercommunicating pore intercommunication trompil and the inside of casing.

In one possible implementation, the transition piece comprises grooves extending in a direction away from the end wall, the grooves being covered by openings, the communication holes being spaced apart on the grooves.

In one possible implementation, the transition piece further includes a flange located at an edge of the recess, the flange being disposed around the recess, the flange being secured to the end wall.

In one possible implementation, the groove is provided with an R angle, which is greater than 0.1mm.

In one possible implementation manner, the number of the grooves is a plurality of grooves, the grooves are mutually nested from inside to outside, and each groove is provided with a communication hole, wherein the innermost groove covers the opening.

In one possible implementation, the positions of the communication holes on two adjacent grooves are staggered.

In one possible implementation, the battery cell further includes a first tab assembly including a first main tab and a first sub-tab extending from the battery cell body, the first main tab including a first connection section and a second connection section located on one side of the first connection section, the first connection section being connected with the first sub-tab, the second connection section including an extension extending to an outside of the first connection section, the extension being connected with the end wall.

In one possible implementation, the transition piece is integrally formed with the extension.

In one possible implementation manner, the first main tab further includes a first bending section connected to the first connection section and the second connection section, and in a thickness direction of the battery cell, the first bending section is located at one end of the first main tab.

In one possible implementation, the end of the first bending section extends beyond the side wall of the recess in the thickness direction of the cell.

In one possible embodiment, the distance between the first connecting section and the end wall is greater than or equal to the distance between the floor of the recess and the end wall.

In one possible implementation, the battery further includes a post assembly mounted on the end wall, and the cell further includes a second tab assembly connected to the post assembly, the transition piece being disposed in spaced relation to the post assembly.

In one possible implementation, the second tab assembly includes a second main tab and a second sub-tab extending from the cell body, the second main tab includes a third connection section and a fourth connection section located on one side of the third connection section, the third connection section is connected with the second sub-tab, and the fourth connection section is connected with the terminal assembly.

In one possible implementation manner, the second main tab further includes a second bending section connected to the third connection section and the fourth connection section, and in the thickness direction of the battery cell, the second bending section is located at one end of the second main tab.

In one possible implementation, the first bending section and the second bending section are located on the same side in the thickness direction of the cell.

In one possible implementation, the battery further comprises a closure member mounted on the outside of the end wall, the closure member being connected to the end wall.

The application provides a battery, this battery sets up the transition piece between the electric core body of end wall and electric core of casing, and transition piece and end wall fixed connection. The end wall of the housing is provided with an aperture, and the projection of the transition piece onto the end wall at least partially overlaps the projection of the aperture onto the end wall. The transition piece is provided with a communication hole for communicating the opening and the inside of the shell. Thus, when the electrolyte is injected into the case, the electrolyte can enter the inside of the case through the opening in the case and the communication hole in the transition piece. When the battery is in the subsequent processing, the transition piece can play a role in blocking electrolyte in the shell, so that the overflow of the electrolyte is reduced, the performance of the battery is improved, and the pollution of the periphery of the opening hole caused by the overflow electrolyte is reduced to influence the connection between the sealing piece and the shell.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description will be given below of the drawings that are needed in the embodiments or the prior art descriptions, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is an exploded view of a battery provided in an embodiment of the present application;

fig. 2 is a schematic view of an end portion of a battery provided in an embodiment of the present application;

FIG. 3 is a cross-sectional view taken at A-A of FIG. 2;

FIG. 4 is a cross-sectional view taken at E-E of FIG. 2;

FIG. 5 is a schematic view of a transition piece provided in an embodiment of the present application;

FIG. 6 is a schematic illustration of another transition piece to endwall connection provided in accordance with an embodiment of the present application;

FIG. 7 is a cross-sectional view taken at B-B of FIG. 2;

fig. 8 is a schematic diagram of connection between a housing, a transition piece and a battery cell according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of a connection between a transition piece and a first main tab according to an embodiment of the present disclosure;

FIG. 10 is a cross-sectional view taken at C-C of FIG. 2;

fig. 11 is a cross-sectional view at D-D in fig. 2.

Reference numerals illustrate:

100-a housing; 110-bottom shell; 111-end walls; 1111-opening; 120-cover;

200-cell; 210-a cell body; 220-a first tab assembly; 221-a first main tab; 2211—a first connection section; 2212—a second connection section; 22121-extension; 2213—a first bending section; 222-a first sub-tab; 230-a second lug assembly; 231-second main tab; 2311-a third connection segment; 2312-a fourth connection segment; 2313-a second bending section; 232-a second sub-tab;

300-transition piece; 310-communicating holes; 320-grooves; 330-flanging;

400-pole assembly; 410-connecting pieces; 420-an inner insulating sheet; 430-an outer insulating sheet; 440-pole;

500-closure.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals refer to the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure. Embodiments of the present application are described in detail below with reference to the accompanying drawings.

In the description of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, indirectly connected through an intermediary, in communication between two elements, or in an interaction relationship between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate an orientation or a positional relationship based on the drawings, which are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices 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 application.

The terms "first," "second," "third" (if any) in the description and claims of the present application and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be capable of being practiced otherwise than as specifically illustrated and described herein.

Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or display that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or display.

In the related art, the opening on the battery shell is directly communicated with the interior of the battery, and the gas generated in the interior of the shell can drive the electrolyte in the shell to overflow from the opening in the subsequent processing process of the battery. The liquid filling amount of the battery is reduced, the performance of the battery is affected, and the electrolyte overflows from the opening to cause dirt around the opening, so that poor connection between the sealing plate and the shell is easily caused.

Through repeated thinking and verification, the inventors of the present application found that if a member for blocking the overflow of the electrolyte is provided between the case and the cell body, the member at least partially covers the opening in the case, and the electrolyte in the case is blocked by the member. In addition, a communication hole is provided in the member to ensure that electrolyte can be injected into the interior of the case through the opening in the case and the communication hole in the member.

In view of this, the inventors devised a battery by providing a transition piece between an end wall of a case and a cell body of a cell, the transition piece being fixedly connected to the end wall of the case. The projection of the transition piece onto the end wall at least partially overlaps the projection of the opening onto the end wall such that the transition piece can act as a barrier to electrolyte in the housing. A communication hole is provided on the transition piece to allow electrolyte to be injected into the interior of the housing.

The following describes in detail the technical solution of the battery provided in the embodiments of the present application with reference to the accompanying drawings.

Referring to fig. 1 to 5, a battery provided in an embodiment of the present application includes a case 100, a battery cell 200, and a transition piece 300. The battery cell 200 is mounted inside the housing 100, and the end wall 111 of the housing 100 is spaced from the battery cell body 210 of the battery cell 200. The end wall 111 has an opening 1111, and the transition member 300 is disposed between the end wall 111 and the cell body 210, and the transition member 300 is fixedly connected to the end wall 111. The projection of the transition piece 300 onto the end wall 111 at least partially overlaps the projection of the aperture 1111 onto the end wall 111. Wherein, the transition piece 300 is provided with a plurality of communication holes 310, and the communication holes 310 communicate the openings 1111 with the inside of the housing 100.

It should be noted that the end wall 111 is a wall surface of the housing 100 opposite to the tab assembly of the battery cell 200. Illustratively, the housing 100 includes a bottom case 110 and a cover 120 covering the bottom case 110, and the cover 120 may be fixed to the bottom case 110 by welding. The battery cell 200 may be disposed inside the bottom case 110, and the opening 1111 is disposed on a wall surface of the bottom case 110 opposite to the tab assembly of the battery cell 200, and the transition piece 300 may be fixedly connected with the wall surface of the bottom case 110 opposite to the tab assembly of the battery cell 200. It is worth mentioning that the opening 1111 of the housing 100 is used for injecting electrolyte into the housing 100.

Illustratively, the transition piece 300 may be secured to the end wall 111 of the housing 100 by welding. It will be appreciated that the projection of the transition piece 300 onto the end wall 111 at least partially overlaps the projection of the aperture 1111 onto the end wall 111, i.e., the transition piece 300 at least partially covers the aperture 1111 along the length of the housing 100.

It should be noted that, a space is provided between the transition piece 300 and the battery cell body 210, so as to avoid the short circuit of the battery caused by the contact between the transition piece 300 and the battery cell body 210.

The number of the communication holes 310 on the transition piece 300 is not limited in this embodiment, and may be one or more, and when the number of the communication holes 310 is more, there is a space between two adjacent communication holes 310. Wherein the communication hole 310 is used for the electrolyte to flow into the inside of the case 100 through the transition member 300 during the injection of the battery.

The application provides a battery, which is provided with a transition piece 300 between an end wall 111 of a shell 100 and a battery cell body 210 of a battery cell 200, and the transition piece 300 is fixedly connected with the end wall 111. The end wall 111 of the housing 100 is provided with an aperture 1111, and the projection of the transition member 300 onto the end wall 111 at least partially overlaps the projection of the aperture 1111 onto the end wall 111. The transition piece 300 is provided with a communication hole 1111 and a communication hole 310 inside the housing 100. Thus, when the electrolyte is injected into the case 100, the electrolyte may enter the inside of the case 100 through the opening 1111 of the case 100 and the communication hole 310 of the transition member 300. When the battery is processed later, the transition piece 300 can block the electrolyte in the casing 100, reduce the overflow of the electrolyte, ensure the liquid injection amount of the battery, improve the performance of the battery and reduce the pollution of the overflow electrolyte around the opening 1111 to affect the connection between the sealing plate and the casing 100.

In one embodiment, as shown in fig. 1-5, the transition piece 300 includes a groove 320 extending in a direction away from the end wall 111, the groove 320 covers the opening 1111, and the communication holes 310 are spaced apart on the groove 320.

Wherein the notch of the groove 320 faces the end wall 111 of the housing 100, the cross-sectional shape of the groove 320 may be square or circular, etc. suitable shape. Illustratively, the recess 320 may completely cover the opening 1111, and the depth of the recess 320 may be set according to the size of the space between the end wall 111 and the cell body 210. In one possible implementation, as shown in fig. 5, a plurality of communication holes 310 are provided on the bottom of the groove 320 and the side walls of the groove 320, respectively.

In the present embodiment, the buffer space is defined between the end wall 111 and the cell body 210 by the groove 320 of the transition piece 300. That is, when the flow rate of the electrolyte in the groove 320 is smaller than the flow rate of the electrolyte outside the groove 320 during the subsequent processing of the battery, the time for the electrolyte to flow to the opening 1111 is prolonged by the groove 320, so that the fluid loss of the battery during the subsequent processing can be further reduced, the performance of the battery is further improved, and the reliability of the connection between the sealing plate and the casing 100 is improved.

In other embodiments, the transition piece 300 may be a plate-like structure that is connected to the end wall 111 and covers at least a portion of the opening 1111, and the communication hole 310 is provided at a position where the plate-like structure faces the opening 1111. The plate-shaped structure plays a role in blocking electrolyte, so that the electrolyte loss of the battery in the subsequent processing process is reduced.

In a specific embodiment, as shown in FIG. 5, the transition piece 300 further includes a flange 330 at an edge of the recess 320, the flange 330 being disposed around the recess 320, the flange 330 being secured to the end wall 111.

Wherein the flange 330 is located at the notch of the groove 320. Illustratively, the transition piece 300 may be formed by stamping using a sheet of metal that, after stamping, forms the recess 320 and the flange 330 at the edge of the recess 320. The width of the flange 330 is not limited in this embodiment, and may be set as desired by those skilled in the art.

Illustratively, the flange 330 may be fixed to the end wall 111 by welding, for example, after the side of the flange 330 facing away from the cell body 210 is abutted against the end wall 111, a laser may be used to blow from the outside of the housing 100 at the location where the end wall 111 and the flange 330 are abutted to fix the flange 330 to the end wall 111.

By providing the flange 330, the flange 330 is tightly attached to the end wall 111 and fixed to the end wall 111, so that the notch of the groove 320 is sealed from the end wall 111 on the basis of ensuring the connection reliability between the transition piece 300 and the end wall 111, and the blocking effect of the transition piece 300 on electrolyte in the casing 100 is ensured.

In one possible implementation, as shown in fig. 5, the grooves 320 are provided with an R angle, which is greater than 0.1mm.

Illustratively, the R angle may be disposed at an end of the recess 320 remote from the end wall 111, i.e., the rounded transition between the side wall of the recess 320 and the bottom of the recess 320.

Further, when the rim of the groove 320 is provided with the flange 330, an R angle may be provided between the flange 330 and the main body portion of the groove 320, i.e., a rounded transition between the sidewall of the groove 320 and the flange 330. The cross section of the groove 320 between the groove bottom and the sidewall is formed as an arc having a radius greater than 0.1mm. Wherein, R angle can be 0.3mm, 0.5mm or 1mm, and is not limited herein.

In this embodiment, the groove 320 may be formed by stamping, by setting the R angle, stress may be prevented from being concentrated between the bottom and the sidewall of the groove 320 during stamping, so as to prevent cracking between the bottom and the sidewall of the groove 320, i.e. stress is dispersed by using the R angle, so as to improve the processing qualification rate of the transition piece 300. In addition, the R angle of the groove 320 can prevent the transition piece 300 from scratching the battery cell body 210 during the placement of the battery cell 200 in the housing 100. An R angle greater than 0.1mm may ensure an evacuation effect of the R angle on stress during the stamping of the groove 320, and ensure that the transition piece 300 does not scratch the cell body 210.

In one possible implementation, as shown in fig. 6, the number of grooves 320 is a number, and the grooves 320 are nested inside-out. Each groove 320 is provided with a communication hole 310, wherein the innermost groove 320 covers the opening 1111.

The number of the grooves 320 is not limited, and may be two or three, etc., and is not limited only herein. It should be noted that, the bottoms of the two adjacent grooves 320 and the sidewalls of the two adjacent grooves 320 are spaced apart. Illustratively, each groove 320 may be secured to the flange 330 by welding. Fig. 6 shows that communication holes 310 are provided on the bottom and side walls of each groove 320.

When the electrolyte is injected, the electrolyte may pass through the communication holes 310 of the respective grooves 320 from inside to outside to enter the inside of the case 100. In the subsequent processing of the battery, the plurality of grooves 320 can play a role in multi-layer blocking of the electrolyte in the casing 100, and a plurality of buffer spaces from inside to outside are defined by the plurality of grooves 320, so that the time for the electrolyte to flow to the opening 1111 is further prolonged, and the loss of the electrolyte in the subsequent processing of the battery is further reduced.

With continued reference to fig. 6, in one possible implementation, the locations of the communication holes 310 on two adjacent grooves 320 are staggered.

Specifically, projections of the communication holes 310 on the adjacent two grooves 320 do not overlap. That is, when the communication holes 310 are provided at both the bottom and the side walls of each groove 320, the communication holes 310 at the bottoms of the adjacent two grooves 320 do not overlap in the length direction of the battery; the communication holes 310 on the side walls of the adjacent two grooves 320 do not overlap in the width direction of the battery.

Through the arrangement, the blocking effect of each groove 320 on the electrolyte can be ensured, so that the transition piece 300 can reliably reduce the electrolyte loss of the battery in the subsequent processing process.

As shown in fig. 1, 3, 7 and 8, in one embodiment, the cell 200 further includes a first tab assembly 220. The first tab assembly 220 includes a first main tab 221 and a first sub-tab 222 extending from the battery cell body 210, the first main tab 221 includes a first connection section 2211 and a second connection section 2212 located at one side of the first connection section 2211, and the first connection section 2211 is connected with the first sub-tab 222. The second connection section 2212 includes an extension 22121 extending to the outside of the first connection section 2211, the extension 22121 being connected with the end wall 111.

The first connection segment 2211 is electrically connected to the second connection segment 2212, and the second connection segment 2212 is located at a side of the first connection segment 2211 facing away from the cell body 210. Illustratively, the first sub-tab 222 may be a multi-layer structure, and each layer of the first sub-tab 222 may be connected to the first connection segment 2211 by welding, and specifically, before the battery cell 200 is placed in the housing 100, each layer of the first sub-tab 222 may be fixed to the first connection segment 2211 by ultrasonic welding. The portion of the extension 22121 facing the first connection section 2211 with the second connection section 2212 is arranged in the width direction of the housing 100. The side of the extension 22121 facing away from the body of the cell 200 is in close proximity to the end wall 111, and the extension 22121 may be secured to the end wall 111 by welding.

In one possible implementation, the opposite sides of the first tab assembly 220 are respectively provided with a protection layer, and the protection layer can prevent the first tab assembly 220 from contacting the battery cell body 210 to generate a short circuit.

In this embodiment, the distance between the extension portion 22121 and the cell body 210 is greater than the distance between the first connection section 2211 and the second connection section 2212, so that the external device can more easily extend between the extension portion 22121 and the cell body 210 and push the extension portion 22121 to be tightly attached to the end wall 111. That is, by providing the extension 22121, connection between the first main tab 221 and the end wall 111 is facilitated, and the manufacturing difficulty of the battery is reduced.

As shown in fig. 6, in one possible implementation, the transition piece 300 is integrally formed with the extension 22121.

Specifically, the extension 22121 extends to an end of the opening 1111 toward the cell body 210 and covers at least a portion of the opening 1111. The communication hole 310 is provided at a position where the extension 22121 faces the opening 1111 to inject the electrolyte.

Further, the extension 22121 may completely cover the end of the opening 1111 toward the cell body 210, and the groove 320 may be disposed on the extension 22121 such that the groove 320 completely covers the opening 1111. The communication hole 310 may be provided on the bottom or side wall of the groove 320.

Through the arrangement, the assembly speed of the battery can be improved, namely, the transition piece 300 is not required to be independently installed in the process of assembling the battery, and after the first main tab 221 is connected with the end wall 111, the transition piece 300 and the end wall 111 can be fixed, so that the production efficiency of the battery can be improved.

As shown in fig. 1, 3, 7 and 9, the first main tab 221 further includes a first bending section 2213 connecting the first connection section 2211 and the second connection section 2212, and the first bending section 2213 is located at one end of the first main tab 221 in the thickness direction of the battery cell 200.

Specifically, the first main tab 221 has an approximately "U" shaped structure, and an opening of the "U" shaped structure faces one end in the thickness direction of the battery. The two sides of the "U" structure are a first connection section 2211 and a second connection section 2212, respectively, and the bottom side of the "U" structure is a first bending section 2213. For example, the first main tab 221 may be formed by bending a metal sheet.

With this structure, the electrical connection between the first connection section 2211 and the second connection section 2212 can be achieved by providing the first bending section 2213.

Further, as shown in fig. 9, in the thickness direction of the battery cell 200, the end portion of the first bending section 2213 extends beyond the side wall of the groove 320.

Illustratively, as shown in fig. 9, the highest point of the first bending section 2213 is higher than the sidewall of the groove 320. Through the above arrangement, when the battery cell 200 and the case 100 are assembled, in the thickness direction of the battery, it is ensured that the side wall of the groove 320 does not interfere with the case 100, so that the groove 320 on the extension 22121 does not obstruct the installation of the first main tab 221.

With continued reference to fig. 9, in one embodiment, the distance between the first connection segment 2211 and the end wall 111 is greater than or equal to the distance between the bottom of the groove 320 and the end wall 111.

Specifically, the size of the groove 320 does not exceed the distance between the first connection section 2211 and the second connection section 2212 in the length direction of the battery. That is, the distance between the bottom of the groove 320 and the cell body 210 is greater than or equal to the distance between the first connection segment 2211 and the cell body 210.

Through the above arrangement, on the one hand, the recess 320 does not obstruct the battery cell 200 from being put into the housing 100, and on the other hand, it is ensured that the recess 320 does not contact the battery cell body 210, thereby avoiding the occurrence of a short circuit of the battery.

As shown in fig. 1, 2, 4, 10 and 11, the battery further includes a post assembly 400 mounted to the end wall 111. The cell 200 further includes a second tab assembly 230, the second tab assembly 230 being connected to the post assembly 400. The transition piece 300 is spaced apart from the pole assembly 400.

When the first tab assembly 220 is the positive tab of the battery cell 200, the second tab assembly 230 is the negative tab of the battery cell 200; when the first tab assembly 220 is the negative tab of the battery cell 200, the second tab assembly 230 is the positive tab of the battery cell 200. It should be noted that the pole assembly 400 and the housing 100 are disposed insulated from each other. Illustratively, the second tab assembly 230 may be connected to the post assembly 400 by welding. There is a space between the transition piece 300 and the post assembly 400 in the width direction of the battery, wherein the size of the space between the transition piece 300 and the post assembly 400 may be set according to actual needs, which is not limited only herein.

In one possible implementation, the protection layers are disposed on opposite sides of the second tab assembly 230, respectively, so that the second tab assembly 230 can be prevented from being in contact with the battery cell body 210 by the protection layers.

As shown in fig. 1, 10 and 11, the terminal assembly 400 includes a connection piece 410, an inner insulation piece 420, an outer insulation piece 430 and a terminal 440, the connection piece 410 and the inner insulation piece 420 are located inside the case 100, and the connection piece 410 is located at a side of the inner insulation piece 420 facing the cell body 210. The outer insulating sheet 430 is located outside the case 100, the pole 440 is disposed through the outer insulating sheet 430, the end wall 111, the inner insulating sheet 420 and the connecting sheet 410, respectively, and the pole 440 rivets and fixes the outer insulating sheet 430, the inner insulating sheet 420 and the connecting sheet 410 to the end wall 111. The pole 440 is electrically connected to the connection piece 410, and the end wall 111 is insulated from the connection piece 410 and the pole 440 by the inner insulating sheet 420 and the outer insulating sheet 430, respectively. Wherein the second tab assembly 230 is connected to the connection piece 410.

In this embodiment, the battery is connected to an external device through the housing 100 and the post assembly 400 on the housing 100, and the transition piece 300 and the post assembly 400 are disposed at intervals, so that the battery is prevented from being short-circuited due to contact between the two components.

As shown in fig. 1, 2, 4, 10 and 11, the second tab assembly 230 includes a second main tab 231 and a second sub-tab 232 protruding from the cell body 210, the second main tab 231 includes a third connection section 2311 and a fourth connection section 2312 located at one side of the third connection section 2311, the third connection section 2311 is connected with the second sub-tab 232, and the fourth connection section 2312 is connected with the tab assembly 400.

Wherein the fourth connection segment 2312 is located at a side of the third connection segment 2311 facing away from the cell body 210. The second sub-tab 232 has a multi-layered structure, and each layer of the second sub-tab 232 and the third connection segment 2311 may be fixed by welding. The side of fourth connection segment 2312 facing away from third connection segment 2311 is attached and secured to pole assembly 400. In one possible implementation, the extension 22121 of the first main tab 221 may be connected to the housing 100, the fourth connection segment 2312 of the second main tab 231 may be connected to the housing 100, and after the two tabs of the battery cell 200 are connected to the housing 100 and the post assembly 400, the battery cell body 210 may be turned over and placed inside the housing 100.

For example, adhesive layers may be disposed on opposite sides of the thickness direction of the battery cell body 210, respectively, and after the battery cell body 210 is turned over and put into the housing 100, the battery cell body 210 and the housing 100 may be fixed by the adhesive layers.

Through the above arrangement, electrical connection between the second sub-tab 232 and the post assembly 400 can be achieved.

As shown in fig. 10 and 11, schematically, the second main tab 231 further includes a second bending section 2313 connecting the third connection section 2311 and the fourth connection section 2312, and the second bending section 2313 is located at one end of the second main tab 231 in the thickness direction of the battery cell 200.

Specifically, the second main tab 231 has an approximately "U" shaped structure, and two sides of the "U" shaped structure are respectively a third connection section 2311 and a fourth connection section 2312, and a bottom edge of the "U" shaped structure is a second bending section 2313. For example, the second main tab 231 may be formed by bending a metal sheet.

With this structure, the electrical connection between the third connection section 2311 and the fourth connection section 2312 can be achieved by providing the second bending section 2313; the second bending section 2313 bends to enable the battery cell body 210 to be turned and put into the housing 100.

As shown in fig. 8, in one possible implementation, first bending section 2213 and second bending section 2313 are located on the same side in the thickness direction of cell 200.

Specifically, when the first main tab 221 and the second main tab 231 are both approximately "U" shaped structures, the openings of the two "U" shaped structures face the same direction and both face one end in the thickness direction of the battery.

In this structure, after the first main tab 221 is connected with the housing 100 and the second main tab 231 is connected with the pole assembly 400, the first main tab 221 or the second main tab 231 does not obstruct the battery core body 210 from being turned over and placed in the housing 100, so as to ensure that the battery core 200 can be assembled smoothly.

In one embodiment, as shown in fig. 1-3, the battery further includes a seal 500, the seal 500 being mounted on the outside of the end wall 111, the seal 500 being connected to the end wall 111.

It should be noted that, the sealing member 500 seals the opening 1111 on the housing 100, so that a sealed environment is formed inside the housing 100, and normal use of the battery is ensured. Illustratively, a boss protruding from the middle of the sealing member 500 is inserted into the opening 1111, so that the sealing member 500 can be quickly positioned by the boss, and the assembly efficiency of the sealing member 500 can be improved. In this embodiment, the height of the boss is not limited, and it is only necessary to ensure that the boss will not interfere with the transition piece 300 after the sealing plate is connected to the housing 100. Wherein the closure 500 may be secured to the end wall 111 of the housing 100 by welding.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (16)

1. A battery is characterized by comprising a shell, an electric core and a transition piece;

the battery cell is arranged in the shell, the end wall of the shell and the battery cell body of the battery cell are arranged at intervals, the end wall is provided with an opening, the transition piece is arranged between the end wall and the battery cell body and is fixedly connected with the end wall, and the projection of the transition piece on the end wall is at least partially overlapped with the projection of the opening on the end wall;

the transition piece is provided with a plurality of communication holes, and the communication holes are communicated with the holes and the inside of the shell.

2. The battery of claim 1, wherein the transition piece includes a groove extending in a direction away from the end wall, the groove covering the opening, the communication holes being spaced apart on the groove.

3. The battery of claim 2, wherein the transition piece further comprises a flange at an edge of the recess, the flange disposed around the recess, the flange secured to the end wall.

4. The battery of claim 2, wherein the recess is provided with an R-angle, the R-angle being greater than 0.1mm.

5. The battery according to claim 2, wherein the number of the grooves is a plurality, the grooves are nested one inside another from inside to outside, the communication holes are provided in each of the grooves, and the innermost groove covers the opening.

6. The battery according to claim 5, wherein the positions of the communication holes on adjacent two of the grooves are staggered.

7. The battery of claim 2, wherein the cell further comprises a first tab assembly comprising a first main tab and a first sub-tab extending from the cell body, the first main tab comprising a first connection section and a second connection section on one side of the first connection section, the first connection section being connected to the first sub-tab, the second connection section comprising an extension extending outside of the first connection section, the extension being connected to the end wall.

8. The battery of claim 7, wherein the transition piece is integrally formed with the extension.

9. The battery of claim 8, wherein the first main tab further comprises a first bending section connecting the first connection section and the second connection section, the first bending section being located at one end of the first main tab in a thickness direction of the cell.

10. The battery of claim 9, wherein an end of the first bending section exceeds a sidewall of the groove in a thickness direction of the cell.

11. The battery of claim 7, wherein a distance between the first connection section and the end wall is greater than or equal to a distance between a floor of the recess and the end wall.

12. The battery of claim 9, further comprising a post assembly mounted to the end wall, the cell further comprising a second tab assembly connected to the post assembly, the transition piece being spaced from the post assembly.

13. The battery of claim 12, wherein the second tab assembly includes a second main tab and a second sub-tab extending from the cell body, the second main tab including a third connection section and a fourth connection section on one side of the third connection section, the third connection section being connected to the second sub-tab, the fourth connection section being connected to the post assembly.

14. The battery of claim 13, wherein the second main tab further comprises a second bending section connecting the third connecting section and the fourth connecting section, the second bending section being located at one end of the second main tab in a thickness direction of the cell.

15. The battery of claim 14, wherein the first bending section and the second bending section are located on the same side in a thickness direction of the cell.

16. The battery of claim 1, further comprising a seal mounted to the outside of the end wall, the seal being connected to the end wall.