CN220021346U - Cover plate assembly of battery monomer, battery pack and power utilization device - Google Patents

Abstract

The utility model discloses a cover plate component of a battery monomer, the battery monomer, a battery pack and an electric device, wherein the battery monomer comprises a shell, the cover plate component is fixed to the end part of the shell, and the cover plate component comprises: the first surface of apron main part that deviates from the shell is equipped with annular first welding groove, and first welding groove is suitable for and is connected with the electricity with electric core subassembly welded fastening in the shell, and the periphery of apron main part is suitable for with shell welded fastening. According to the battery cell cover plate assembly provided by the embodiment of the utility model, the first welding groove is formed in the cover plate main body, so that the corresponding positions of the cover plate main body and the battery cell assembly can be conveniently and quickly determined through the first welding groove, the cover plate main body and the battery cell assembly can be conveniently fixed and electrically connected, the outer periphery of the cover plate main body is welded to fix the cover plate assembly on the battery cell shell, the processing difficulty is reduced by utilizing the welding mode, the production efficiency is further conveniently improved, and the cost is saved.

Description

Cover plate assembly of battery monomer, battery pack and power utilization device

Technical Field

The utility model relates to the technical field of batteries, in particular to a cover plate assembly of a battery monomer, the battery monomer, a battery pack and an electric device.

Background

The cover plate component in the related art is arranged at the positive electrode end or the negative electrode end of the battery cell, and when the cover plate component is arranged on the shell of the battery cell, the cover plate component is generally installed on the shell of the battery cell in a upsetting manner, so that the processing difficulty is high.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the single-battery cover plate assembly, which is characterized in that the first welding groove is formed in the cover plate main body, so that the corresponding positions of the cover plate main body and the battery core assembly can be quickly determined through the first welding groove, the fixing and electric connection of the cover plate main body and the battery core assembly can be conveniently realized, meanwhile, the peripheral edge of the cover plate main body is welded to fix the cover plate assembly on the single-battery shell, the processing difficulty can be reduced in a welding mode, the production efficiency can be conveniently improved, and the cost can be saved.

The utility model further provides a battery cell, a battery pack and an electric device with the cover plate assembly of the battery cell.

A cover assembly of a battery cell according to an embodiment of the first aspect of the present utility model, the battery cell including a housing, the cover assembly being fixed to an end of the housing, the cover assembly including: the cover plate main body, the first surface that deviates from of cover plate main body is equipped with annular first welding groove, first welding groove is concave towards first direction, first welding groove be suitable for with electric core subassembly welded fastening in the shell is in order to be connected electrically, first welding groove with the periphery of cover plate main body sets up along the interval, the periphery of cover plate main body along be suitable for with shell welded fastening.

According to the battery cell cover plate assembly provided by the embodiment of the utility model, the first welding groove is formed in the cover plate main body, so that the corresponding positions of the cover plate main body and the battery cell assembly can be conveniently and quickly determined through the first welding groove, the cover plate main body and the battery cell assembly can be conveniently fixed and electrically connected, the outer periphery of the cover plate main body is welded to fix the cover plate assembly on the battery cell shell, the processing difficulty is reduced by utilizing the welding mode, the production efficiency is further conveniently improved, and the cost is saved.

In addition, the cap plate assembly of the battery cell according to the above embodiment of the present utility model may have the following additional technical features:

according to some embodiments of the utility model, a portion of the cover plate body projects toward the first direction to define a first welding projection, and the first welding groove is disposed opposite the first welding projection.

In some embodiments, the thickness of the first welding protrusion ranges from 0.3mm to 0.8mm; and/or the protruding height of the first welding protrusion is 0.5-0.8 mm.

According to some embodiments of the utility model, the first weld groove has a bottom width greater than or equal to 1.5mm.

According to some embodiments of the utility model, the first welding projection is formed in a closed loop shape.

According to some embodiments of the utility model, the extending direction of the side wall of the first welding groove forms an included angle with the first direction.

According to some embodiments of the utility model, an angle between an extending direction of the side wall of the first welding groove and the first direction is 20 ° to 90 °.

According to some embodiments of the utility model, the cover body has a step portion located outside the first welding groove, the step portion being in snap-fit with an end portion of the housing.

According to some embodiments of the utility model, the cover body is provided with a plurality of spaced reinforcing regions, each of the reinforcing regions being defined by a portion of the cover body projecting toward the first direction, adjacent ones of the reinforcing regions defining an air passage therebetween in the first direction, the air passage extending toward a region of the cover body for mounting an explosion-proof assembly configured to open to vent when subjected to a predetermined pressure.

In some embodiments, the cover plate assembly further comprises: and the explosion-proof assembly is arranged on the cover plate main body, and the gas passage extends towards the explosion-proof assembly to be suitable for guiding gas to the explosion-proof assembly.

In some examples, the cover body is provided with a through hole, the explosion proof assembly includes a rupture disc, the rupture disc and the cover body are separate machined molded parts, the rupture disc is fixed to the cover body and is arranged opposite to the through hole, and the rupture disc is configured to break when being subjected to a predetermined pressure.

In some embodiments, the explosion proof assembly further includes a protective sheet disposed on the first surface, the rupture sheet disposed on the second surface of the cover plate body facing the housing, the protective sheet configured to separate at least a portion from the cover plate body to expose the through-hole when subjected to the predetermined pressure.

In some examples, the opposed side walls of the closure body are each provided with a receiving slot for receiving the rupture disc and the protection disc.

According to some embodiments of the utility model, the cover body is further provided with a liquid filling hole.

In some embodiments, the liquid injection hole comprises a first sink groove and a second sink groove, wherein in the first direction, the first sink groove and the second sink groove are sequentially arranged, and the cross-sectional area of the first sink groove is larger than that of the second sink groove.

According to a second aspect of the present utility model, there is provided a battery cell including: a housing having an opening at an end thereof; the battery cell assembly is arranged in the shell; according to the cover plate assembly of the battery unit, the first welding groove is welded and fixed with the battery cell assembly to be electrically connected, and the outer peripheral edge of the cover plate main body is welded and fixed with the shell to close the opening.

In some embodiments, the cover body is formed in a disk shape, and the housing is formed in a cylindrical shape.

In some embodiments, the battery cell assembly comprises a battery cell and a current collecting disc, wherein the battery cell is in conductive connection with one end of the current collecting disc, and the other end of the current collecting disc is fixedly welded with the first welding groove.

According to the battery cell provided by the embodiment of the utility model, the cover plate assembly of the battery cell is utilized, and the first welding groove is formed in the cover plate main body, so that the corresponding positions of the cover plate main body and the battery cell assembly can be quickly determined through the first welding groove, the fixing and electric connection of the cover plate main body and the battery cell assembly are conveniently realized, meanwhile, the outer peripheral edge of the cover plate main body is welded to fix the cover plate assembly on the shell of the battery cell, the processing difficulty is reduced by utilizing the welding mode, the production efficiency is further improved, and the cost is saved.

According to a third aspect of the present utility model, an embodiment proposes a battery pack comprising a plurality of battery cells, each of the battery cells being a battery cell according to an embodiment of the second aspect of the present utility model.

According to the battery pack disclosed by the embodiment of the utility model, the battery cell according to the second aspect of the utility model is utilized, and the first welding groove is formed in the cover plate main body, so that the corresponding positions of the cover plate main body and the battery cell assembly can be quickly determined through the first welding groove, the cover plate main body and the battery cell assembly can be conveniently fixed and electrically connected, meanwhile, the outer peripheral edge of the cover plate main body is welded to fix the cover plate assembly on the shell of the battery cell, and the welding mode is utilized to facilitate reducing the processing difficulty, further facilitating the improvement of the production efficiency and saving the cost.

An embodiment according to a fourth aspect of the utility model proposes an electrical consumer comprising a battery pack according to an embodiment of the third aspect of the utility model.

According to the power utilization device disclosed by the embodiment of the utility model, the battery pack according to the embodiment of the third aspect of the utility model is utilized, and the first welding groove is formed in the cover plate main body, so that the corresponding positions of the cover plate main body and the battery cell assembly can be quickly determined through the first welding groove, the fixing and the electric connection of the cover plate main body and the battery cell assembly can be conveniently realized, meanwhile, the peripheral edge of the cover plate main body is welded to fix the cover plate assembly on the shell of the battery cell, and the welding mode is utilized to facilitate reducing the processing difficulty, further facilitating the improvement of the production efficiency and saving the cost.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic view illustrating a structure of a cap plate assembly of a battery cell in one direction according to an embodiment of the present utility model.

Fig. 2 is a schematic view illustrating a structure of a cap plate assembly of a battery cell in another direction according to an embodiment of the present utility model.

Fig. 3 is an exploded view of a cap plate assembly of a battery cell according to an embodiment of the present utility model.

Fig. 4 is a top view of fig. 2.

Fig. 5 is a cross-sectional view at A-A in fig. 4.

Fig. 6 is an enlarged view at B in fig. 5.

Fig. 7 is an enlarged view at D in fig. 5.

Fig. 8 is an enlarged view at E in fig. 5.

Reference numerals: the cover plate assembly 1,

the cover main body 10, the reinforcing region 11, the gas escape passage 12, the first welding projection 13, the first welding groove 14, the through hole 15, the receiving groove 16, the liquid injection hole 17, the first sinking groove 171, the second sinking groove 172, the step portion 18, the chamfer 19,

Explosion proof assembly 20, rupture disk 21, protection disk 22.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

The following describes a cap plate assembly 1 of a battery cell according to an embodiment of the present utility model with reference to the accompanying drawings.

As shown in fig. 1 to 8, the cap assembly 1 of the battery cell according to the embodiment of the present utility model includes a cap body 10.

The battery cell includes the shell, and apron subassembly 1 is fixed to the tip of shell to can protect the tip of battery, and the first surface that deviates from the shell of apron main part 10 is formed with first welding groove 14, and first welding groove 14 is towards first direction concave, and first welding groove 14 is suitable for with the electric core subassembly welded fastening in the shell in order to be connected electrically, and first welding groove 14 sets up along the interval with the periphery of apron main part 10, and the periphery of apron main part 10 is suitable for with the shell welded fastening.

When the cover plate main body 10 is fixed on the shell of the battery cell, the cover plate main body 10 can be welded from the first welding groove 14, and then the position, corresponding to the first welding groove 14, on the cover plate main body 10 is welded and fixed with the battery cell assembly together, so that the battery cell assembly and the cover plate main body 10 are fixed and electrically connected, and the cover plate main body 10 is utilized to realize the electric connection of the battery cell assembly and external components.

After the position of the cover plate main body 10 is determined by using the first welding groove 14, the first welding groove 14 is welded firstly to fix the cover plate main body 10 and the battery cell assembly together in a welding manner and to realize the electric connection between the cover plate main body 10 and the battery cell assembly, and then the peripheral edge of the cover plate main body 10 is welded to weld the peripheral wall of the cover plate main body 10 and the shell together, so that the cover plate assembly 1 is mounted to the end part of the shell, the cover plate assembly 1 can protect the end part of the battery, and the mode of fixing the cover plate assembly 1 and the shell together is simple and convenient and reduces the processing difficulty conveniently.

Specifically, the welding device can heat the cover plate main body 10 from the first welding groove 14, and the corresponding position of the first welding groove 14 on the cover plate main body 10 is heated and melted, so that the cover plate main body 10 and the battery cell assembly can be welded together. The welding apparatus may heat the cap body 10 from the outer circumferential edge of the cap body 10, and after the outer circumferential edge of the cap body 10 is melted by heating, the outer circumferential edge of the cap body 10 can be fixedly connected with the case to fix the cap body 10 to the end of the case, and the end of the battery is protected by the cap body 10.

Wherein, set up first welding groove 14 and apron main part 10's periphery along the interval to need the welded region to fix a position on the apron main part 10 through first welding groove 14, specifically, first welding groove 14 is just to setting up with the electric core subassembly, in order to can carry out accurate welding to apron main part 10 through first welding groove 14, accurately welded connection is in the same place with electric core subassembly with apron main part 10 through first welding groove 14, in order to install apron main part 1 in the appointed position department on the battery monomer.

Through setting up first welding groove 14, be convenient for on the one hand confirm the relative position of electric core subassembly and apron main part 10 through first welding groove 14, on the other hand be convenient for follow first welding groove 14 department with apron main part 10 and electric core subassembly welded connection together, like this the operator when fixing apron main part 10 on the battery cell, can confirm the position of apron main part 10 for electric core subassembly fast, then weld apron main part 10, make electric core subassembly and the first welding groove 14 corresponding position department welded connection of apron main part 10 to realize electric core subassembly and apron main part 10's electric connection. Further, by providing the first welding groove 14, the strength of the cover plate main body 10 can be enhanced, and the deformation due to the concentration of stress during welding can be avoided, thereby providing a production yield.

Meanwhile, the outer peripheral wall of the cover plate main body 10 is welded and fixed with the outer peripheral wall of the cover plate main body 10 and the outer shell, so that the cover plate main body 10 can be quickly and accurately fixed on the outer shell of the battery cell, and the cover plate assembly 1 can be quickly fixed at one end of the outer shell.

Compared with the method that the cover plate main body 10 needs to be bent, mound sealed and other operations to fix the cover plate main body 10 on the shell, the method for welding and fixing the cover plate main body 10 on the shell in the mode is simpler and faster, the operation difficulty is lower, and further the efficiency of operators in operation is improved conveniently.

Therefore, according to the cover plate assembly 1 of the battery cell in the embodiment of the utility model, the first welding groove 14 is formed in the cover plate main body 10, so that the corresponding positions of the cover plate main body 10 and the battery cell assembly can be quickly determined through the first welding groove 14, the fixing and electric connection of the cover plate main body 10 and the battery cell assembly can be conveniently realized, meanwhile, the peripheral edge of the cover plate main body 10 is welded to fix the cover plate assembly 1 on the battery cell shell, the processing difficulty can be reduced in a welding mode, the production efficiency can be conveniently improved, and the cost can be saved.

The following describes a cap plate assembly 1 of a battery cell according to an embodiment of the present utility model with reference to the accompanying drawings.

As shown in fig. 1 to 8, the cap assembly 1 of the battery cell according to the embodiment of the present utility model includes a cap body 10.

In some embodiments of the present utility model, a portion of the cap body 10 protrudes toward the first direction to define a first welding protrusion 13, and a first welding groove 14 is disposed opposite to the first welding protrusion 13 to enable a penetration welding operation of the first welding protrusion 13 at the first welding groove 14, so that the first welding protrusion 13 is welded with the cell assembly to achieve fixing and electrical connection of the cap body 10 and the cell assembly.

Wherein, make first welding protrusion 13 along first direction protrusion to be convenient for realize the location of apron main part 10 and electric core subassembly through first welding protrusion 13, so that confirm apron subassembly 1 for electric core subassembly's position, the operation degree of difficulty when being convenient for reduce the welding simultaneously, in order to weld the end at battery cell shell with apron subassembly 1 smoothly.

Specifically, the soldering apparatus may heat the first soldering bump 13 from the first soldering groove 14, and the first soldering bump 13 is melted after being heated to solder the first soldering bump 13 with the cell assembly. Meanwhile, the cap body 10 may be manufactured by flat plate stamping, i.e., stamping in the first direction to simultaneously form the first welding groove 14 and the first welding protrusion 13, with ease and convenience in manufacturing.

In some alternative embodiments of the present utility model, the thickness of the first welding protrusion 13 is in the range of 0.3mm to 0.8mm, so that the heat at the first welding groove 14 can be smoothly transferred to the first welding protrusion 13 while the thickness of the first welding protrusion 13 is ensured, and a part of the area of the first welding protrusion 13 can be melted, so that the welding connection between the first welding protrusion 13 and the battery cell assembly is realized.

Wherein, as shown in fig. 6, the thickness N of the first welding projection 13 is the distance between the bottom wall of the first welding groove 14 and the projection surface of the first welding projection 13 in the first direction. Alternatively, the thickness N of the first welding protrusion 13 may be 0.4mm, 0.5mm, 0.6mm or 0.7mm, so that the heat at the first welding groove 14 can be smoothly transferred to the first welding protrusion 13 while the thickness of the first welding protrusion 13 is ensured, and a part of the area of the first welding protrusion 13 can be melted, so as to realize the welding connection between the first welding protrusion 13 and the battery cell assembly.

In some alternative embodiments of the present utility model, as shown in fig. 6, the protruding height of the first welding protrusion 13 is 0.5 to 0.8mm, and optionally, the protruding height M of the first welding protrusion 13 is 0.5mm, 0.6mm, 0.7mm or 0.8mm, so that the first welding protrusion 13 can sufficiently match with the cell assembly of the battery cell, thereby facilitating the welding connection of the first welding protrusion 13 and the cell assembly. Wherein the protruding height M of the first welding protrusion 13 is a distance between the surface of the cap body 10 and the protruding surface of the first welding protrusion 13 in the first direction.

In some embodiments, the battery cell includes a housing and a battery cell assembly, the battery cell assembly is disposed in the housing, the cover main body 10 is disposed at an end of the housing and the battery cell assembly, the first welding protrusion 13 protruding along the first direction on the cover main body 10 is in stop fit with the end of the battery cell assembly, so as to achieve preliminary positioning of the cover main body 10 and the battery cell, and then the first welding protrusion 13 is welded, so as to fix the cover assembly 1 at one end of the battery cell assembly.

In some embodiments, as shown in fig. 6, the bottom width L of the first welding groove 14 is greater than or equal to 1.5mm, alternatively, the bottom width L of the first welding groove 14 may be 1.7mm, 2mm, 2.2mm, 2.4mm, or 2.5mm, wherein the welding device directly contacts the bottom of the first welding groove 14 to heat the bottom of the first welding groove 14 and thus the first welding protrusion 13, such that the bottom width L of the first welding groove 14 is greater than or equal to 1.5mm, so that the welding device can sufficiently heat the first welding protrusion 13.

In some alternative embodiments of the present utility model, as shown in fig. 1, the first welding protrusions 13 are formed in a closed loop shape so as to reduce the positioning operation of the cap assembly 1, thereby facilitating the rapid and convenient welding of the cap assembly 1 at one end of the cell assembly and the housing.

Specifically, after the cover plate assembly 1 is disposed at one end of the cell assembly and the housing, when the cover plate assembly 1 is welded to the cell assembly, the cover plate assembly 1 does not need to be rotated, and the position of the first welding protrusion 13 along the circumferential direction thereof does not need to be adjusted, so that the cover plate assembly 1 is welded to the cell assembly conveniently and rapidly.

In other alternative embodiments of the present utility model, the first welding protrusion 13 includes a plurality of arc-shaped welding parts forming an intermittent annular shape, each of the plurality of arc-shaped welding parts corresponding to the cell assembly, so as to accurately determine the positions of the cap body 10 and the cell assembly, and thus to accurately weld the cap assembly 1 at one end of the cell assembly.

In some alternative embodiments of the present utility model, as shown in fig. 5 and 6, an included angle is formed between the extending direction of the side wall of the first welding groove 14 and the first direction, so that the welding device can perform a welding operation on the first welding protrusion 13 at the first welding groove 14, and further, weld the cover plate assembly 1 on the cell assembly.

In some embodiments, as shown in fig. 6, the angle K between the extending direction of the side wall of the first welding groove 14 and the first direction is 20 ° to 90 °, and optionally, the angle K between the extending direction of the side wall of the first welding groove 14 and the first direction bracket is 30 °, 45 °, 60 °, 80 °, or 90 °.

When the first welding protrusion 13 and the battery cell are welded together by using laser welding, the included angle K between the extending direction of the side wall of the first welding groove 14 and the first direction bracket is 20-90 degrees, so that laser is conveniently injected, and the first welding protrusion 13 and the battery cell assembly are welded by using laser welding, so that the cover plate assembly 1 is fixed at one end of the battery cell assembly.

In some embodiments of the present utility model, as shown in fig. 1 and 4, the first welding protrusion 13 is formed in a closed-loop shape, and the corresponding first welding groove 14 is formed in a closed-loop shape, wherein the radius of the first welding protrusion 13 formed in the closed-loop shape is equal to the radius of the first welding groove 14 formed in the closed-loop shape, and the radius R0 of the first welding protrusion 13 formed in the closed-loop shape is greater than or equal to the radius of the cover body 10, so that the first welding protrusion 13 and the first welding groove 14 are disposed at the periphery of the cover body 10, thereby facilitating the welding of the first welding protrusion 13 and the positioning of the first welding protrusion 13 and the cell assembly.

In some embodiments of the present utility model, the cover body 10 has a step 18, the step 18 is located outside the first welding groove 14, the step 18 is in lap fit with the end of the housing, so that the position of the cover body 10 is limited by the fit of the step 18 and the end of the housing, so that the first welding groove 14 on the cover body 10 is convenient to weld and fix the cover body 10 and the battery cell assembly together, and the peripheral edge of the cover body 10 is convenient to weld and fix the cover body 10 and the housing together, so that the cover assembly 1 is fixed at the end of the housing.

It should be noted here that the outer side is referred to herein as being a distance from the center of the cover plate body 10 that is greater than the first welding groove 14.

In some embodiments of the present utility model, the cover body 10 is provided with a plurality of reinforcing areas 11, the reinforcing areas 11 are disposed on the cover body 10 at intervals, each reinforcing area 11 is defined by a portion of the cover body 10 protruding toward the first direction, so as to strengthen the structural strength of the cover body 10, and further facilitate increasing the pressure bearing capability of the cover assembly 1, so as to protect the battery cell, and avoid the deformation of the cover body 10 when the cover assembly 1 is subjected to the internal pressure or external force of the battery cell.

In the first direction, the gas-passing channels 12 are defined between the adjacent reinforcing areas 11, the gas-passing channels 12 extend towards the area of the cover plate main body 10 for installing the explosion-proof assembly 20, the explosion-proof assembly 20 is configured to be opened to exhaust when being subjected to a preset pressure, so that gas in the battery cell can flow to the explosion-proof assembly 20 along the gas-passing channels 12, and then when the explosion-proof assembly 20 is subjected to the preset pressure, the gas in the battery cell can be discharged from the explosion-proof assembly 20 to release the pressure of the battery cell, so that the excessive gas in the battery cell is avoided, the expansion of the battery cell is avoided, and the potential safety hazard is avoided.

In some alternative embodiments of the present utility model, the cover plate assembly 1 further includes an explosion-proof assembly 20, the explosion-proof assembly 20 is disposed on the cover plate body 10, the gas passage 12 extends toward the explosion-proof assembly 20 to be suitable for guiding the gas to the explosion-proof assembly 20, so that the gas inside the battery cell can flow to the explosion-proof assembly 20 along the gas passage 12, and when the explosion-proof assembly 20 is subjected to a predetermined pressure, the gas inside the battery cell can be discharged from the explosion-proof assembly 20, so as to avoid excessive gas inside the battery cell, avoid expanding the battery cell, and avoid causing a safety hazard.

As shown in fig. 3, in the present embodiment, the first direction extends along the axial direction of the cap body 10 (it should be understood that the above-mentioned directional limitation is only for convenience of description of the drawings, and does not limit the actual arrangement position and direction of the cap assembly 1 of the battery cell), the cap body 10 is provided with a plurality of reinforcing regions 11, the plurality of reinforcing regions 11 are arranged at intervals along the circumferential direction of the cap body 10, each reinforcing region 11 protrudes along the first direction, two adjacent reinforcing regions 11 define gas-passing channels 12, and the plurality of gas-passing channels 12 are arranged at intervals along the circumferential direction of the cap body 10, so that the gas in the battery cell can uniformly flow to the explosion-proof assembly 20 along the plurality of gas-passing channels 12, so that the gas in the battery cell can be smoothly discharged from the explosion-proof assembly 20.

In some alternative embodiments of the present utility model, the protruding height of the first welding protrusion 13 in the first direction is not smaller than the protruding height of the reinforcing region 11 in the first direction, that is, the protruding height of the first welding protrusion 13 in the first direction is greater than or equal to the protruding height of the reinforcing region 11 in the first direction, so as to ensure welding reliability while facilitating reduction of welding difficulty.

In some embodiments of the present utility model, as shown in fig. 3, the cover body 10 is provided with the through hole 15, the explosion-proof assembly 20 includes the rupture disk 21, the rupture disk 21 and the cover body 10 are formed as a separate processing piece, so as to ensure the strength performance of the cover body 10 and the strength performance of the rupture disk 21 at the same time, so as to reduce the processing difficulty, the rupture disk 21 is fixed to the cover body 10 and is disposed opposite to the through hole 15, so as to be capable of sealing and shielding the position of the through hole 15, the rupture disk 21 is configured to be broken when receiving a predetermined pressure, and at this time, the gas in the battery cell can be smoothly discharged from the through hole 15, so as to release the pressure of the battery cell.

In some alternative embodiments of the present utility model, the explosion-proof assembly 20 further includes a protection sheet 22, the protection sheet 22 is disposed on a first surface of the cap body 10 facing the housing, the rupture sheet 21 is disposed on a second surface of the cap body 10 facing away from the housing, and the protection sheet 22 is configured to be separated from the cap body 10 to expose the through-holes 15 when receiving a predetermined pressure, so that gas in the battery cell can be smoothly discharged from the through-holes 15 to smoothly discharge the pressure of the battery cell.

Wherein, set up protection piece 22 and can protect through-hole 15, protect the rupture disk 21 of through-hole 15 department to in avoiding article in the environment can stretch to through-hole 15, avoid causing the damage of rupture disk 21 when the pressure that rupture disk 21 received does not reach preset pressure, avoid influencing the free normal use of battery.

In addition, when the rupture disk 21 is damaged, the protection disk 22 can shield the position of the through hole 15, so that fragments formed after the rupture disk 21 is damaged can be prevented from being ejected from the position of the through hole 15, and potential safety hazards are avoided.

In some embodiments, the partial area of the rupture disc 21 is thinner to enable the rupture disc 21 to rupture when the pressure experienced by the rupture disc 21 reaches a predetermined pressure, while avoiding the rupture disc 21 from being broken into undersize fragments by impact, avoiding fragments from escaping from the gap between the protective disc 22 and the through-hole 15, and avoiding potential safety hazards.

In some embodiments of the present utility model, as shown in fig. 3, the opposite side walls of the cover main body 10 are provided with receiving grooves 16, and the receiving grooves 16 are used for receiving the rupture disk 21 and the protection disk 22, so as to position the rupture disk 21 and the protection disk 22 on the cover main body 10, avoid that the rupture disk 21 and the protection disk 22 protrude from the cover main body 10, and avoid that the articles in the environment interfere with the positions of the rupture disk 21 and the protection disk 22.

In some embodiments, the rupture disk 21 is secured within the receiving groove 16 by laser butt welding and the protective disk 22 is glued within the receiving groove 16.

In some embodiments of the present utility model, as shown in fig. 1, the cover main body 10 is further provided with a liquid injection hole 17, where the liquid injection hole 17 is used for injecting liquid, so as to timely supplement the electrolyte in the battery unit, and further enable the battery unit to be charged or discharged smoothly. In addition, the gas in the battery cell can be discharged from the liquid injection hole 17.

As shown in fig. 4, in the present embodiment, the liquid injection hole 17 is provided at the central position of the cap body 10 to facilitate the direct determination of the position of the liquid injection hole 17 when the battery cell is injected from the liquid injection hole 17.

In some alternative embodiments of the present utility model, as shown in fig. 8, the injection hole 17 includes a first sink groove 171 and a second sink groove 172, and in the first direction, the first sink groove 171 and the second sink groove 172 are sequentially arranged, and the first sink groove 171 and the second sink groove 172 are provided for achieving sealing of the injection hole 17.

Specifically, when the liquid injection hole 17 is sealed, the liquid injection hole 17 is sealed by adopting double sealing of sealing elements and welding sealing, at least one part of the sealing elements is arranged at the second sinking groove 172, so that the position of the sealing elements is limited by the second sinking groove 172, the sealing elements can seal the liquid injection hole 17 in a blocking mode, and the welding equipment seals the liquid injection hole 17 at the first sinking groove 171 in a welding mode, so that the liquid injection hole 17 can be fully sealed, and electrolyte in a battery unit is prevented from flowing out of the liquid injection hole 17.

The cross-sectional area of the first sink groove 171 is larger than that of the second sink groove 172, so that laser can be injected from the first sink groove 171, and then the laser can be injected into the first sink groove 171, so that the first sink groove 171 can be cleaned, the cleanliness of the first sink groove 171 is ensured, the subsequent welding of the first sink groove 171 is facilitated, and the welding sealing superiority is improved.

In some embodiments of the present utility model, the depth of the second sink 172 is 0.4mm-0.7mm to allow room for the seal to avoid the seal from falling from the fill hole 17 into the cell.

Specifically, the seal has a sealing head and the second countersink 172 is configured to receive the sealing head to define the position of the seal to prevent the seal from falling from the fill port 17 into the cell. Optionally, the depth P of the second sink 172 is 0.5mm, 0.55mm, 0.6mm or 0.65mm.

In some examples, the cross-sectional area of the first sink groove 171 is greater than the cross-sectional area of the second sink groove 172, and in order to facilitate the injection of laser light to clean the first sink groove 171, the depth Q of the first sink groove 171 is 0.5mm to 0.8mm, optionally, the depth Q of the first sink groove 171 is 0.55mm, 0.6mm, 0.65mm, 0.7mm, or 0.75mm.

The battery cell according to the embodiment of the present utility model is described below. The battery cell according to the embodiment of the present utility model includes a case, a cell assembly, and a cap plate assembly 1 of the battery cell according to the above embodiment of the present utility model.

The tip of shell is equipped with the opening, and the battery cell subassembly is located in the shell, and first welding groove 14 and battery cell subassembly welded fastening are in order to be connected with the electricity, and the periphery edge and the shell welded fastening of apron main part 10 are in order to seal the opening, and then make apron main part 10 can protect the battery cell subassembly in the shell.

The outer periphery edge of the cover plate main body 10 is welded and fixed with the shell so as to fix the cover plate main body 10 at the end part of the shell, and then the cover plate assembly 1 is arranged at the end part of the opening, the shell and the cell assembly are protected by the cover plate assembly 1, and meanwhile, the current on the cell assembly can flow to the cover plate assembly 1 and the shell so that the current can flow to specified parts through the shell or the cover plate assembly 1.

In some embodiments, the reinforced area 11 protrudes toward the direction of the cell assembly, so that the reinforced area 11 can support the position of the cell assembly, and thus can define the position of the cell assembly in the housing, so as to avoid the cell assembly from being excessively accumulated in the housing.

It should be explained here that the case may be a positive electrode or a negative electrode of the battery cell, and the cap assembly 1 may be disposed at the positive electrode end or the negative electrode end of the battery cell, without being excessively limited thereto.

In some embodiments of the present utility model, the cover body 10 is formed in a disc shape, and the housing is formed in a cylindrical shape so that the cover body 10 is adapted to the shape of the housing, so that the outer circumferential edge of the cover body 10 can be welded to the housing, thereby stably fixing the cover body 10 at the end of the housing.

Simultaneously, make the shell form cylindric to make battery monomer form cylindrical battery, so that improve battery monomer shell's compressive property, and then be convenient for improve battery monomer's security.

In the embodiment of using battery monomer on the consumer, be equipped with in the consumer and be used for placing battery monomer's battery compartment, battery compartment is cylindric battery compartment, makes the free shell of battery form cylindric to adapt to the shape of battery compartment in the consumer, in order to place battery monomer on the consumer, make battery monomer can be smooth for the consumer power supply.

In some embodiments of the present utility model, the battery cell assembly includes a battery cell and a current collecting plate, one end of the battery cell is electrically connected to one end of the current collecting plate, the other end of the current collecting plate is welded to the first welding groove 14, the current collecting plate and the cover body 10 can be welded together by welding the first welding groove 14, and the electrical connection between the current collecting plate and the cover body 10 can be achieved, so that the current in the battery cell can flow to the cover body 10 through the current collecting plate, so that the current in the battery cell can flow to the external component through the current collecting plate and the cover body 10, so as to supply power to the external component.

In some embodiments of the present utility model, as shown in fig. 6, the thickness Z of the cover main body 10 is 0.5mm to 2.0mm, so as to control the thickness of the cover assembly 1, thereby facilitating the reduction of the occupied space of the cover assembly 1 in the battery cell, and further facilitating the improvement of the utilization rate of the space in the battery cell.

Alternatively, the cover body 10 thickness Z may be 0.8mm, 1mm, 1.2mm, 1.5mm, or 1.8mm.

As shown in fig. 1, 2, and 6, in the present embodiment, the cover main body 10 has a stepped portion 18, the stepped portion 18 is located at the outer periphery of the cover main body 10, the first welding protrusion 13 is located inside the stepped portion 18, and the first welding protrusion 13 is higher than the stepped portion 18 in the first direction to facilitate the in-case of the cover assembly 1 when the cover assembly 1 is disposed at the opening of the case in the first direction. Wherein the thickness Y of the step 18 is 0.3mm to 0.8mm, alternatively the thickness Y of the step 18 is 0.4mm, 0.5mm, 0.6mm or 0.7mm.

Wherein, the periphery of the cover plate body 10 is also provided with a round angle or chamfer 19 to facilitate the cover plate body 10 to enter the shell when the cover plate body 10 is arranged at the opening of the end part of the shell. The size of the round corners is R0.2-R0.5, and specifically, the size of the round corners can be R0.2, R0.3, R0.4 or R0.5. The chamfer 19 has a dimension of C0.2 to C0.5, specifically, the chamfer 19 has a dimension selected from C0.2, C0.3, C0.4 or C0.5.

According to the battery cell according to the embodiment of the utility model, by using the cover plate assembly 1 of the battery cell according to the embodiment of the utility model, the first welding groove 14 is arranged on the cover plate main body 10, so that the corresponding positions of the cover plate main body 10 and the battery cell assembly can be quickly determined through the first welding groove 14, the fixing and electric connection of the cover plate main body 10 and the battery cell assembly can be conveniently realized, meanwhile, the outer peripheral edge of the cover plate main body 10 is welded to fix the cover plate assembly 1 on the shell of the battery cell, and the welding mode is beneficial to reducing the processing difficulty, thereby facilitating the improvement of the production efficiency and saving the cost.

A battery pack according to an embodiment of the present utility model is described below. The battery pack according to the embodiment of the present utility model includes a plurality of battery cells according to the above-described embodiment of the present utility model.

According to the battery pack disclosed by the embodiment of the utility model, by utilizing the battery cell according to the embodiment of the utility model, the first welding groove 14 is formed in the cover plate main body 10, so that the corresponding positions of the cover plate main body 10 and the battery cell assembly can be quickly determined through the first welding groove 14, the fixing and electric connection of the cover plate main body 10 and the battery cell assembly can be conveniently realized, meanwhile, the outer peripheral edge of the cover plate main body 10 is welded to fix the cover plate assembly 1 on the shell of the battery cell, and the welding mode is used for reducing the processing difficulty, thereby facilitating the improvement of the production efficiency and saving the cost.

An electric device according to an embodiment of the present utility model is described below. The power consumption device according to the embodiment of the utility model comprises the battery pack according to the above embodiment of the utility model.

According to the power utilization device provided by the embodiment of the utility model, by utilizing the battery pack provided by the embodiment of the utility model, the first welding groove 14 is formed in the cover plate main body 10, so that the corresponding positions of the cover plate main body 10 and the battery cell assembly can be quickly determined through the first welding groove 14, the fixing and electric connection of the cover plate main body 10 and the battery cell assembly can be conveniently realized, meanwhile, the peripheral edge of the cover plate main body 10 is welded to fix the cover plate assembly 1 on the shell of the battery cell, and the welding mode is used for reducing the processing difficulty, thereby facilitating the improvement of the production efficiency and saving the cost.

Other constructions and operations of the power consuming device according to embodiments of the present utility model are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more. In the description of the utility model, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.

In the description of the utility model, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (20)

1. A cover plate assembly (1) of a battery cell, the battery cell comprising a housing, the cover plate assembly (1) being fixed to an end of the housing, the cover plate assembly (1) comprising:

the cover plate body (10), the first surface that deviates from of cover plate body (10) is equipped with annular first welding groove (14), first welding groove (14) are towards first direction concave, first welding groove (14) be suitable for with electric core subassembly welded fastening in the shell is in order to be connected electrically, first welding groove (14) with the periphery along interval setting of cover plate body (10), the periphery along be suitable for of cover plate body (10) with shell welded fastening.

2. The battery cell cover assembly (1) of claim 1, wherein a portion of the cover body (10) projects toward the first direction to define a first welding projection (13), the first welding groove (14) being disposed directly opposite the first welding projection (13).

3. The cover plate assembly (1) of a battery cell according to claim 2, wherein the thickness of the first welding protrusion (13) has a value ranging from 0.3mm to 0.8mm; and/or

The protruding height of the first welding protrusion (13) is 0.5-0.8 mm.

4. The battery cell cover assembly (1) of claim 1, wherein the first weld groove (14) has a bottom width of greater than or equal to 1.5mm.

5. The battery cell cover assembly (1) of claim 1, wherein the first weld groove (14) is formed in a closed loop shape.

6. The battery cell cover assembly (1) according to claim 1, wherein the extending direction of the side wall of the first welding groove (14) forms an angle with the first direction.

7. The battery cell cover assembly (1) of claim 6, wherein an angle between an extension direction of a side wall of the first welding groove (14) and the first direction is 20 ° to 90 °.

8. The battery cell cover assembly (1) according to claim 1, wherein the cover main body (10) has a step portion (18), the step portion (18) being located outside the first welding groove (14), the step portion (18) being in lap-fit with an end portion of the housing.

9. The battery cell cover assembly (1) according to claim 1, wherein the cover body (10) is provided with a plurality of reinforcement areas (11) arranged at intervals, each reinforcement area (11) being defined by a portion of the cover body (10) protruding towards the first direction in which an air passage (12) is defined between adjacent reinforcement areas (11), the air passage (12) extending towards an area of the cover body (10) for mounting an explosion-proof assembly (20), the explosion-proof assembly (20) being configured to open for venting when subjected to a predetermined pressure.

10. The battery cell cover assembly (1) of claim 9, further comprising:

-an explosion proof assembly (20), the explosion proof assembly (20) being provided to the cover body (10), the gas passage (12) extending towards the explosion proof assembly (20) for guiding gas towards the explosion proof assembly (20).

11. The battery cell cover assembly (1) according to claim 10, wherein the cover body (10) is provided with a through hole (15), the explosion-proof assembly (20) comprises a rupture disc (21), the rupture disc (21) and the cover body (10) are formed as a separate piece, the rupture disc (21) is fixed to the cover body (10) and is arranged opposite to the through hole (15), and the rupture disc (21) is configured to break when subjected to a predetermined pressure.

12. The battery cell cover assembly (1) of claim 11, wherein the explosion proof assembly (20) further comprises a protective sheet (22), the protective sheet (22) being provided on the first surface, the rupture sheet (21) being provided on a second surface of the cover body (10) facing the housing, the protective sheet (22) being configured to separate at least partially from the cover body (10) to expose the through-hole (15) when subjected to the predetermined pressure.

13. The battery cell cover assembly (1) according to claim 12, wherein the opposite side walls of the cover body (10) are each provided with a receiving groove (16) for receiving the rupture disc (21) and the protection disc (22).

14. The battery cell cover assembly (1) according to any one of claims 1-13, wherein the cover body (10) is further provided with a liquid injection hole (17).

15. The battery cell cover assembly (1) of claim 14, wherein the liquid injection hole (17) includes a first sink groove (171) and a second sink groove (172), the first sink groove (171) and the second sink groove (172) being sequentially arranged in the first direction, and a cross-sectional area of the first sink groove (171) is larger than a cross-sectional area of the second sink groove (172).

16. A battery cell, comprising:

a housing having an opening at an end thereof;

the battery cell assembly is arranged in the shell;

cover plate assembly (1), wherein the cover plate assembly (1) is a cover plate assembly (1) according to any one of claims 1-14, the first welding groove (14) is welded and fixed with the battery cell assembly to be electrically connected, and the peripheral edge of the cover plate main body (10) is welded and fixed with the shell to close the opening.

17. The battery cell according to claim 16, wherein the cap body (10) is formed in a disc shape, and the case is formed in a cylindrical shape.

18. The battery cell of claim 16, wherein the cell assembly comprises a cell and a current collecting plate, the cell being conductively connected to one end of the current collecting plate, the other end of the current collecting plate being welded to the first weld groove.

19. A battery pack comprising a plurality of battery cells, each of the battery cells being a battery cell according to any one of claims 16-18.

20. An electrical device comprising the battery pack of claim 19.