CN112242593A - Battery cell, battery, electric device, manufacturing method and equipment thereof - Google Patents

Abstract

The application relates to a battery cell, a battery, an electric device, a manufacturing method and equipment thereof. The battery cell includes: an electrode terminal; an electrode assembly; the electrode assembly comprises an electrode terminal, an adapter part and at least one bending part, wherein the adapter part comprises a first adapter part, a second adapter part and at least one bending part; and the protection part is arranged on at least part of the bending part to reduce the deformation of the bending part in the using process. The battery monomer of this application aims at solving the battery monomer problem of charging and discharging inefficacy.

Description

Battery cell, battery, electric device, manufacturing method and equipment thereof

Technical Field

The present disclosure relates to the field of battery technologies, and in particular, to a battery cell, a battery, an electric device, a manufacturing method, and an apparatus thereof.

Background

The rechargeable battery has high energy density, high power density, high cycle frequency, long storage time and other advantages, and is widely used in electric vehicles, mobile devices and electric tools. The battery includes a battery cell. In the use process of the battery, the condition that the single battery body is failed in charging and discharging exists, and the normal use of the battery is influenced.

Disclosure of Invention

The application provides a battery monomer, a battery, an electric device, a manufacturing method and equipment thereof, aiming at solving the problem of failure of charging and discharging of the battery monomer.

In one aspect, the present application provides a battery cell, including:

an electrode terminal; an electrode assembly; the electrode assembly comprises an electrode terminal, an adapter part and at least one bending part, wherein the adapter part comprises a first adapter part, a second adapter part and at least one bending part; and the protection part is arranged on at least part of the bending part to reduce the deformation of the bending part in the using process.

The battery cell according to an embodiment of the present application includes an electrode terminal, an electrode assembly, an adaptor member, and a protection part. The adaptor parts are connected to the electrode terminals and the electrode assembly, respectively. The adapter component comprises a first adapter part, a second adapter part and a bending part. The first transfer portion is for connection with the electrode terminal, and the second transfer portion is for connection with the electrode assembly. The bending part is used for connecting the first switching part and the second switching part. The protection part is arranged on at least part of the bending part. The protection portion can improve the fatigue resistance of the portion of bending for reduce the deformation of the portion of bending in the use, thereby reduce the portion of bending and take place fatigue damage and lead to self cracked possibility, and then reduce and lead to the battery monomer to appear the possibility of opening circuit because of the portion of bending breaks, effectively improve the free job stabilization nature of battery and life.

According to an embodiment of the application, the protection portion extends from the bending portion to at least one of the first transition portion and the second transition portion.

The protection portion can form protection to the junction of bending portion and first switching portion and the junction of bending portion and second switching portion, reduces because of there is fatigue stress effect in the junction and leads to the possibility that breaks takes place in the junction.

According to one embodiment of the application, the minimum thickness of the portion of the protection portion beyond the bend is greater than the maximum thickness of the portion of the protection portion disposed at the bend.

The part that the protection portion extended to on first switching portion and the second switching portion can be favorable to further reducing the clearance between first switching portion and the second switching portion, further reduces the activity of second switching portion, reduces the department of bending and causes cracked possibility because of bearing great tensile stress.

According to an embodiment of the application, the portion of bending has breach and relative medial surface and lateral surface, and the medial surface is close to the breach, and the breach is kept away from to the lateral surface, and medial surface and lateral surface all are provided with the protection portion to along the width direction of the portion of bending, the protection portion surpasss the edge of the portion of bending, and wherein, the part that surpasses the edge of the portion of bending on the protection portion that lies in medial surface and lateral surface is connected.

After the medial surface and the lateral surface of the portion of bending all set up the protection portion, the protection portion of medial surface and lateral surface all can be used for the stress of the portion of dispersing to bend to further improve the fatigue resistance of the portion of bending, be favorable to further reducing the deformation of the portion of bending in the use. After the part that exceeds the edge of the portion of bending on the protection portion that lies in the medial surface of the portion of bending and lateral surface is connected, can improve the joint strength and the connection stability of protection portion, reduce the protection portion and the portion of bending and take place the separation and drop and lose the possibility of protection portion of bending effect.

According to an embodiment of the application, the portion of bending has breach and relative medial surface and lateral surface, and the medial surface is close to the breach, and the breach is kept away from to the lateral surface, and the protection part sets up the lateral surface at the portion of bending.

Because the outer side surface of the bending part bears larger tensile stress after the bending part is bent, and the bending part is more easily broken relative to the inner side surface, the protection part is arranged on the outer side surface of the bending part, so that the stress can be effectively dispersed, and the possibility of breaking the outer side surface of the bending part is reduced.

According to one embodiment of the application, the material of the protective portion is selected from electrolyte corrosion resistant materials.

The material of the protection part is selected from electrolyte corrosion resistant materials, so that the possibility that the protection part is damaged and loses the protection effect due to the fact that the electrolyte in the shell corrodes the protection part is reduced.

According to an embodiment of the application, the protection portion has elasticity.

The protection portion is easily bent, and the possibility that the bending difficulty of the bending portion is increased by the protection portion when the bending portion and the protection portion are bent simultaneously is reduced.

According to one embodiment of the application, the protection part is connected with the adapter part in a hot-pressing composite mode; alternatively, a protective portion is formed on the adapter member using a coating process.

The connection strength between the protection part and the adapter part can be ensured by adopting a hot-pressing composite process or a mode of forming the protection part on the adapter part by using a coating process.

According to an embodiment of the application, the protection part is a sheet body with uniform thickness, and the thickness of the protection part ranges from 0.02 mm to 0.2 mm.

According to one embodiment of the application, the rigidity of the bending part is smaller than the rigidity of the first transfer part and/or the rigidity of the second transfer part, so that the bending part is easy to deform relative to the first transfer part and/or the second transfer part.

According to one embodiment of the application, the bending part is provided with a reduced thickness area, and the maximum thickness of the part of the protection part arranged in the reduced thickness area is less than or equal to the reduced thickness of the bending part in the reduced thickness area.

The bending part is easy to bend and deform in the thickness reducing area, so that the bending part can be bent in the thickness reducing area, the accuracy of the bending position of the bending part is improved, and the bending difficulty of the bending part is reduced.

According to an embodiment of the application, the adapter component further comprises a connecting portion, and the bending portion connects the first adapter portion and the second adapter portion through the connecting portion.

According to one embodiment of the present application, the adapter member is an integrally formed structure.

The adapter part is not provided with splicing transition positions, so that the overall mechanical strength is high, and the possibility of fracture of the adapter part in the bending process and the subsequent use process is favorably reduced.

In another aspect, a battery is provided according to the present application, which includes the battery cell as in the above embodiments.

In yet another aspect, an electrical device is provided according to the present application, which includes a battery as in the above embodiments, the battery being used for providing electrical energy.

In yet another aspect, there is provided a method of manufacturing a battery cell according to the present application, including:

providing an electrode terminal and an electrode assembly;

providing an adapter part comprising a first adapter part, a second adapter part and at least one bending part, wherein the first adapter part is used for being connected with the electrode terminal, the second adapter part is used for being connected with the electrode assembly, and the bending part is used for connecting the first adapter part and the second adapter part;

and providing a protection part which is arranged on at least part of the bending part to reduce the deformation of the bending part in the using process.

In still another aspect, there is provided a battery cell manufacturing apparatus according to the present application, including:

first means for providing an electrode terminal and an electrode assembly;

the second device is used for providing an adapter component comprising a first adapter part, a second adapter part and at least one bending part, wherein the first adapter part is used for being connected with the electrode terminal, the second adapter part is used for being connected with the electrode assembly, and the bending part is used for connecting the first adapter part and the second adapter part;

and the third device is used for providing a protection part which is arranged on at least part of the bending part so as to reduce the deformation of the bending part in the using process.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present application will be described below by referring to the accompanying drawings.

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

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

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

fig. 4 is an exploded schematic view of a battery module according to an embodiment of the present disclosure;

fig. 5 is an exploded view of a battery cell according to an embodiment of the present disclosure;

FIG. 6 is a schematic cross-sectional view taken along A-A of FIG. 5;

FIG. 7 is an enlarged view at B in FIG. 6;

fig. 8 is a partial cross-sectional structural schematic view of a battery cell according to another embodiment of the present application;

fig. 9 is a partial cross-sectional structural schematic view of a battery cell according to another embodiment of the present application;

fig. 10 is a partial cross-sectional structural schematic view of a battery cell according to another embodiment of the present application;

fig. 11 is a schematic view illustrating a connection state of the adaptor member and the protection portion according to an embodiment of the present application;

fig. 12 is a schematic view illustrating a connection state of the adaptor member and the protector according to another embodiment of the present application;

fig. 13 is a partial cross-sectional structural schematic view of a battery cell according to another embodiment of the present application;

fig. 14 is a partial cross-sectional structural schematic view of a battery cell according to another embodiment of the present application;

fig. 15 is a schematic view showing a connection state of the adaptor member and the protector according to another embodiment of the present application;

fig. 16 is a partial cross-sectional structural view of a battery cell according to yet another embodiment of the present application;

fig. 17 is a schematic view showing a connection state of an adapter member and a protection portion according to still another embodiment of the present application;

fig. 18 is a schematic flow chart illustrating a method of manufacturing a battery cell according to an embodiment of the present disclosure;

fig. 19 is a schematic view of a manufacturing apparatus of a battery cell according to an embodiment of the present application.

In the drawings, the drawings are not necessarily drawn to scale.

Description of the labeling:

1. a vehicle; 1a, a motor; 1b, a controller; 10. a battery; 11. a first portion; 12. a second portion; 20. a battery module; 30. a housing; 31. a barrel; 32. a first cover body; 33. a second cover body; 40. a battery cell; 50. a housing; 60. an electrode assembly; 61. a main body portion; 62. a positive tab; 63. a negative tab; 70. an end cap; 80. an electrode terminal; 90. an adapter component; 91. a first transition portion; 92. a second transfer part; 93. a bending part; 93a, an inner side; 93b, an outer side surface; 93c, a gap; 931. a reduced thickness region; 94. a connecting portion; 100. a protection part; 200. a first device; 300. a second device; 400. a third device; x, axial direction; y, width direction; z, thickness direction.

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.

In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical, but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The following description is given with the directional terms as they are used in the drawings and not intended to limit the specific structure of the present application. In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.

The applicant has noticed that the battery cell has a problem of charge and discharge failure, and then has conducted research and analysis on the battery and the respective structures of the battery cell. The applicant finds that in a single battery, a switching component for connecting an electrode terminal and an electrode assembly has an open circuit problem, so that the single battery has a charge and discharge failure problem. Further research and analysis, the applicant finds that the adapter part can break in the use process of the single battery, so that the adapter part is broken. The applicant has found that during the use of the battery cell, the battery cell can work in a vibration environment and needs to bear the vibration force. The electrode assembly of the battery cell can change in position under the vibration condition, so that the electrode assembly can extrude or stretch the adapter part, stress fatigue occurs on the local part of the adapter part, and then the adapter part breaks.

Based on the above problems discovered by the applicant, the applicant improves the structure of the battery cell, and the following further describes the embodiments of the present application.

For a better understanding of the present application, embodiments of the present application are described below with reference to fig. 1 to 19.

The present embodiment provides an electric device using a battery 10 as a power source. The electric device can be, but is not limited to, a vehicle, a ship, an aircraft or the like. Referring to fig. 1, one embodiment of the present application provides a vehicle 1. The vehicle 1 may be a fuel automobile, a gas automobile, or a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range-extended automobile and the like. In an embodiment of the present application, the vehicle 1 may include a motor 1a, a controller 1b, and a battery 10. The controller 1b is used to control the battery 10 to supply power to the motor 1 a. The motor 1a is connected to wheels through a transmission mechanism, thereby driving the vehicle 1 to travel. The battery 10 may serve as a driving power source for the vehicle 1, instead of or in part in place of fuel or natural gas to provide driving power for the vehicle 1. In one example, the battery 10 may be provided at the bottom or the front or rear of the vehicle 1. The battery 10 may be used to power the vehicle 1. In one example, the battery 10 may be used as an operating power source of the vehicle 1 for a circuit system of the vehicle 1. For example, the battery 10 may be used for operational power requirements during start-up, navigation and operation of the vehicle 1.

Referring to fig. 2 and 3, the battery 10 includes a case. The type of the case is not limited. The box body can be a frame-shaped box body, a disc-shaped box body or a box-shaped box body and the like. Illustratively, the case includes a first portion 11 and a second portion 12 that is closed over the first portion 11. The first part 11 and the second part 12 are covered to form a containing part. Fig. 3 schematically shows the battery module 20 according to an embodiment, and the battery module 20 is disposed in the accommodating portion of the case. The battery module 20 includes a plurality of battery cells 40. The plurality of battery cells 40 may be connected in series or in parallel or in series-parallel.

In some embodiments, in order to meet different power requirements, the battery 10 may include a plurality of battery cells 40, wherein the plurality of battery cells 40 may be connected in series or in parallel or in series-parallel, and the series-parallel refers to a mixture of series connection and parallel connection. That is, a plurality of battery cells 40 may be directly disposed in the receiving portion of the case to constitute the battery 10.

Referring to fig. 3 and 4, the battery module 20 includes a housing 30 and a battery cell 40 disposed in the housing 30. In one example, the housing 30 includes a barrel 31, a first cover 32, and a second cover 33. The first cover 32 and the second cover 33 are respectively disposed at both ends of the cylinder 31. The first cover 32 and the second cover 33 are detachably connected to the cylinder 31, respectively. For example, the first cover 32 and the second cover 33 are respectively engaged with the cylinder 31 or connected by screws. The cylinder 31, the first cover 32, and the second cover 33 are assembled to form an accommodating space. The battery cells 40 are disposed in the receiving space of the case 30.

Referring to fig. 5, a battery cell 40 of the embodiment of the present application includes a case 50 and an electrode assembly 60 disposed in the case 50. The housing 50 of the embodiment of the present application may have a cylindrical structure, a square structure, or other structures. The case 50 has an inner space accommodating the electrode assembly 60 and the electrolyte having corrosiveness and an opening communicating with the inner space. The housing 50 may be made of a material such as aluminum, aluminum alloy, or plastic. The electrode assembly 60 of the embodiment of the present application may be formed by stacking or winding a first pole piece, a second pole piece, and a separator together, wherein the separator is an insulator between the first pole piece and the second pole piece. In this embodiment, the first electrode tab is exemplarily described as a positive electrode tab, and the second electrode tab is exemplarily described as a negative electrode tab. Both the positive electrode tab and the negative electrode tab include a coated region and an uncoated region. The positive electrode tab active material is coated on the coating region of the positive electrode tab, and the negative electrode tab active material is coated on the coating region of the negative electrode tab. On the coated region, the active material is coated on a current collector formed of a metal thin plate, and on the uncoated region, the active material is not coated. Electrode assembly 60 includes a main body portion 61, a positive electrode tab 62, and a negative electrode tab 63. The body portion 61 has two end portions oppositely disposed in the axial direction X of the electrode assembly 60. The uncoated regions of the positive electrode sheet are layered to form positive electrode tabs 62, and the uncoated regions of the negative electrode sheet are layered to form negative electrode tabs 63. The positive tab 62 and the negative tab 63 each extend from one end of the body portion 61.

Referring to fig. 5, the battery cell 40 of the embodiment of the present application further includes an end cap 70, an electrode terminal 80, and an adaptor member 90. The end cap 70 is sealingly connected to the housing 50. The electrode terminal 80 is disposed on the end cap 70. The electrode terminal 80 is electrically connected to the electrode assembly 60 through the adaptor member 90.

When the battery cell 40 is in a vibration environment, there is a possibility that the electrode assembly 60 inside the case 50 reciprocates in the axial direction X, and the electrode assembly 60 may press or stretch the adaptor member 90 when reciprocating.

Referring to fig. 6, the adapter member 90 of the embodiment of the present application is positioned on a side of the end cap 70 facing the electrode assembly 60. The adapter member 90 is connected to a portion of the electrode terminal on the side of the end cap 70 facing the electrode assembly 60. For example, the adaptor member 90 and the electrode terminal 80 may be welded or riveted. The adapter member 90 is connected to the electrode assembly 60. Illustratively, the adapter member 90 may be connected to the positive tab 62 or the negative tab 63 of the electrode assembly 60. For example, the adaptor member 90 may be welded to the positive tab 62 or the negative tab 63 of the electrode assembly 60. The electrode assembly 60 may perform a charge and discharge function through the adaptor member 90 and the electrode terminal 80.

Referring to fig. 7, an adapter member 90 according to an embodiment of the present disclosure includes a first adapter portion 91, a second adapter portion 92, and a bending portion 93. The bent portion 93 is located between the first transition portion 91 and the second transition portion 92. The vertical dashed lines in fig. 7 are used to show the boundaries of the bends 93 and do not represent a solid structure. The first transfer portion 91 of the transfer member 90 is used to connect with the electrode terminal 80. The second adapter portion 92 of the adapter member 90 is used to connect with the electrode assembly 60. The bent portion 93 is used to connect the first transition portion 91 and the second transition portion 92. For example, an end of the first adaptor portion 91 may be connected to the bending portion 93, and an end of the second adaptor portion 92 may be connected to the bending portion 93. For example, a middle portion between both ends of the first transition portion 91 may be connected to the bent portion 93, and a middle portion between both ends of the second transition portion 92 may be connected to the bent portion 93.

An external force is applied to the adaptor member 90 in an unbent state to bend the adaptor member 90, thereby forming a bent portion 93. In the bent adapter member 90, the first adapter 91 and the second adapter 92 are provided at an interval. A gap is provided between the second adaptor portion 92 and the end surface of the electrode terminal 80 facing the electrode assembly 60. When the electrode assembly 60 reciprocates, the external force applied to the second adapter 92 by the electrode assembly 60 can make the second adapter 92 move back and forth close to or away from the first adapter 91, so that the second adapter 92 can change the deformation degree of the bending portion 93, and the stress borne by the bending portion 93 changes, that is, the bending portion 93 bears the fatigue stress. Under such a condition, the bent portion 93 may be damaged by fatigue, and may break.

The battery cell 40 of the embodiment of the present application further includes a protection portion 100. The protection portion 100 is disposed at least in part of the bending portion 93. At least part of the bent portion 93 is covered with a protection portion 100. The protector 100 is used to reduce deformation of the bent portion 93 during use. When second switching portion 92 is close to or keeps away from first switching portion 91 reciprocating motion, protection portion 100 can disperse the stress that bears on the portion 93 of bending for the portion 93 of bending self is out of shape for a short time, and the stress fluctuation that self bore is little, thereby is favorable to reducing fatigue stress, reduces the portion 93 of bending and takes place fatigue damage and lead to self the cracked possibility of appearing.

The battery cell 40 of the embodiment of the present application includes an electrode terminal 80, an electrode assembly 60, an adaptor member 90, and a protection part 100. The electrode terminals 80 and the electrode assembly 60 are connected to the adaptor member 90, respectively. The adapter member 90 includes a first adapter portion 91, a second adapter portion 92, and a bent portion 93. The first transfer portion 91 is used to connect with the electrode terminal 80, and the second transfer portion 92 is used to connect with the electrode assembly 60. The bent portion 93 is used to connect the first transition portion 91 and the second transition portion 92. The protection portion 100 is disposed at least in part of the bending portion 93. Protection portion 100 can improve the fatigue resistance of the portion 93 of bending for reduce the deformation of the portion 93 of bending in the use, thereby reduce the portion 93 of bending and take place fatigue damage and lead to self fracture possibility, and then reduce and lead to battery monomer 40 to appear the possibility of opening a circuit because of the portion 93 of bending breaks, effectively improve battery monomer 40's job stabilization nature and life.

In some embodiments, referring to fig. 7, the bent portion 93 is directly connected to an end of the first transition portion 91 and an end of the second transition portion 92. The bending shape of the bent portion 93 is substantially an arc structure, which is beneficial to reducing the possibility that the bent portion 93 is broken due to the occurrence of a stress concentration region on the bent portion 93. The protector 100 may cover the whole of the bent portion 93. The bent portion 93 has an inner side surface 93a and an outer side surface 93b opposite to each other. Here, the bent portion 93 has a notch 93 c. The inner side 93a is proximate the notch 93c and the outer side 93b is distal the notch 93 c. The bent portion 93 is bent to form a notch 93c without forming a closed structure. The inner side surface 93a of the bent portion 93 receives compressive stress, and the outer side surface 93b receives tensile stress. The protector 100 may be provided on the inner surface 93a of the bent portion 93.

For example, the protection portion 100 is disposed on the bending portion 93 before the bending portion 93 is bent, and then an external force is applied to the connecting member 90 to bend the connecting member 90, so as to form the bending portion 93, and the protection portion 100 is bent along with the bending portion 93.

In some embodiments, referring to fig. 8, the protection portion 100 extends from the bending portion 93 to the first transition portion 91 and the second transition portion 92, so that the protection portion 100 can protect the connection between the bending portion 93 and the first transition portion 91 and the connection between the bending portion 93 and the second transition portion 92, and the possibility of fracture at the connection due to fatigue stress at the connection is reduced. In addition, a portion of the protection part 100 extending onto the first and second transfer parts 91 and 92 may fill a gap between the first and second transfer parts 91 and 92 or a gap between the second transfer part 92 and the electrode terminal 80. When the second switching portion 92 is close to or far from the first switching portion 91 in a reciprocating motion, because the clearance between the first switching portion 91 and the second switching portion 92 becomes small or the clearance between the second switching portion 92 and the electrode terminal 80 becomes small, the activity of the second switching portion 92 becomes small, thereby the self deformation degree of the bending portion 93 becomes small, the stress fluctuation born by the self becomes small, and further the fatigue stress born by the bending portion 93 is reduced, and the possibility that the bending portion 93 is broken due to fatigue damage is reduced.

It can be understood that the protection portion 100 extends from the bending portion 93 to one of the first transition portion 91 and the second transition portion 92, and the above-mentioned corresponding purpose and effect can be achieved, which is not described herein again.

In some embodiments, referring to fig. 9, the minimum thickness of the portion of protector 100 beyond bend 93 is greater than the maximum thickness of the portion of protector 100 disposed at bend 93. The portion of the protection portion 100 extending onto the first transition portion 91 and the second transition portion 92 may be beneficial to further reduce the gap between the first transition portion 91 and the second transition portion 92, and further reduce the amount of movement of the second transition portion 92. For example, the portion of the protection part 100 extending to the first and second transition parts 91 and 92 may cover the entire first and second transition parts 91 and 92.

In some embodiments, referring to fig. 10, the inner side surface 93a of the bending portion 93 and the outer side surface 93b of the bending portion 93 are both provided with the protection portion 100. After the inner side surface 93a and the outer side surface 93b of the bending portion 93 are both provided with the protection portions 100, the protection portions 100 on both sides can be used for dispersing the stress of the bending portion 93, so that the fatigue resistance of the bending portion 93 is further improved, the deformation of the bending portion 93 in the using process is further reduced, and the possibility of fracture of the bending portion 93 is reduced.

In other embodiments, the outer side 93b of the bending part 93 may be provided with the protection part 100, and the inner side 93a of the bending part 93 is not provided with the protection part 100. After the bending portion 93 is bent, the outer side surface 93b of the bending portion 93 bears a large tensile stress and is more likely to break relative to the inner side surface 93a, so that the protection portion 100 is provided on the outer side surface 93b of the bending portion 93, and the stress of the bending portion 93 can be effectively dispersed, so that the fatigue resistance of the bending portion 93 can be improved, and the possibility of breaking of the outer side surface 93b of the bending portion 93 can be reduced.

In some embodiments, fig. 11 schematically illustrates the structure of the interposer component 90 prior to being unbent. As shown in fig. 11, in the thickness direction Z of the bent portion 93, two opposite surfaces of the bent portion 93 may form an inner side surface 93a and an outer side surface 93b after the bent portion 93 is bent. Referring to fig. 10 and 11, the protector 100 extends beyond the edge of the bent portion 93 in the width direction Y of the bent portion 93. A portion of the protection portion 100 on one side of the bending portion 93 beyond the edge of the bending portion 93 is connected to a portion of the protection portion 100 on the other side of the bending portion 93 beyond the edge of the bending portion 93. In this way, after the bent portion 93 is bent, the portions of the protection portion 100 located on the inner side surface 93a and the outer side surface 93b, which exceed the edge of the bent portion 93, are connected to each other, so that the connection strength and the connection stability of the protection portion 100 can be improved, and the possibility that the protection portion 100 and the bent portion 93 are separated and fall off to lose the function of protecting the bent portion 93 is reduced.

In some embodiments, the number of the protection parts 100 is two. A protection portion 100 is disposed on each of two opposite sides of the bending portion 93. The portions of the protection portions 100 on both sides beyond the edges of the bent portions 93 are connected. The portions of the protection parts 100 at both sides that are beyond the top may be connected by thermal compression. For example, the excess portions of the protector 100 on both sides may be stacked in the thickness direction Z and connected to each other. Exemplarily, the portions of the protection parts 100 at both sides that are beyond may also be stacked and connected to each other in the width direction Y.

In other embodiments, a blank is folded from one side of bend 93 around one edge of bend 93 to the other side of bend 93, thereby forming guard 100 on both sides of bend 93. And then, the part of the protection part 100 on one side of the bending part 93, which exceeds the edge of the bending part 93, is connected with the part of the protection part 100 on the other side of the bending part 93, which exceeds the edge of the bending part 93, in a hot-pressing compounding manner. For example, the excess portions of the protector 100 on both sides may be stacked in the thickness direction Z and connected to each other. Exemplarily, the portions of the protection parts 100 at both sides that are beyond may also be stacked and connected to each other in the width direction Y.

In some embodiments, the guard 100 may be a sheet. The material of the protection part 100 is selected from materials resistant to electrolyte corrosion, so that the possibility that the protection part 100 is damaged and loses protection effect due to the electrolyte in the case 50 corroding the protection part 100 is reduced. Illustratively, the material of the protective part 100 may be polypropylene, polytetrafluoroethylene, polyethylene terephthalate, or the like.

In some embodiments, the protection portion 100 may be thermally compression-bonded to the bending portion 93, so that the connection strength between the protection portion 100 and the bending portion 93 may be improved. Therefore, on one hand, when the protection part 100 is bent along with the bending part 93, the possibility that the protection part 100 and the bending part 93 are separated and layered to cause a gap between the protection part 100 and the bending part 93 is reduced, and therefore after the bending is finished, the protection part 100 can be always attached to the bending part 93 and the stress of the bending part 93 is reduced; on the other hand, under the vibration reduction condition, the protection part 100 and the bending part 93 are separated and fall off.

In some embodiments, fig. 12 schematically illustrates the structure of the adapter member 90 prior to being unbent. Referring to fig. 12, a protective portion 100 is formed on the adapting member 90 using a coating process. In the thickness direction Z of the bent portion 93, two surfaces of the bent portion 93 facing each other may form an inner surface 93a and an outer surface 93b after the bent portion 93 is bent. Protection portions 100 are provided on opposite sides of the bent portion 93 in the thickness direction Z of the bent portion 93. The protective part 100 formed by the coating process extends beyond the edge of the bent part 93 along the width direction Y of the bent part 93. A portion of the protection portion 100 on one side of the bending portion 93 beyond the edge of the bending portion 93 is connected to a portion of the protection portion 100 on the other side of the bending portion 93 beyond the edge of the bending portion 93. In this way, after the bent portion 93 is bent, the portions of the protection portion 100 located on the inner side surface 93a and the outer side surface 93b, which exceed the edge of the bent portion 93, are connected to each other, so that the connection strength and the connection stability of the protection portion 100 can be improved, and the possibility that the protection portion 100 and the bent portion 93 are separated and fall off to lose the function of protecting the bent portion 93 is reduced. For example, the protection portion 100 may be an integrally formed structure, so as to be beneficial to further improving the connection stability of the protection portion 100 and the adaptor component 90, and make the protection portion 100 not easy to separate from the adaptor component 90 and fall off.

In some embodiments, the stiffness of the bending portion 93 is less than the stiffness of the first transition portion 91 and/or the stiffness of the second transition portion 92, so that the bending portion 93 is easily deformed relative to the first transition portion 91 and/or the second transition portion 92, thereby reducing the bending difficulty of the bending portion 93 and reducing the possibility of bending and breaking of the bending portion 93 in the bending process.

In some embodiments, the bent portion 93 is heat treated to make the rigidity of the bent portion 93 smaller than the rigidity of the first transition portion 91 and/or the rigidity of the second transition portion 92. For example, the bent portion 93 is annealed to reduce the rigidity of the bent portion 93.

In some embodiments, referring to fig. 13, the bending portion 93 is subjected to a material removal process so that the rigidity of the bending portion 93 is less than the rigidity of the first transition portion 91 and/or the rigidity of the second transition portion 92. The material removal region in bend 93 forms reduced thickness region 931. The bent portion 93 is easily bent first at the reduced thickness region 931. The maximum thickness of the portion of guard 100 disposed in reduced thickness region 931 is equal to or less than the thickness of bend 93 reduced in reduced thickness region 931. Bending portion 93 is easily bent and deformed in thickness reduction region 931, so that bending portion 93 can be guaranteed to be bent in thickness reduction region 931, the accuracy of bending position of bending portion 93 is improved, and the bending difficulty of bending portion 93 is reduced. Illustratively, a material removal process is performed on the inner side surface 93a of the bent portion 93 to form a reduced thickness region 931.

In some embodiments, referring to fig. 14 and 15, the adapter component 90 further includes a connection portion 94. The bent portion 93 connects the first transition portion 91 and the second transition portion 92 by a connection portion 94. Bent portions 93 are provided between the connection portion 94 and the first transfer portion 91 and between the connection portion 94 and the second transfer portion 92. The first transition portion 91 and the second transition portion 92 are located on opposite sides of the connection portion 94 in the axial direction X. Each of the bent portions 93 is provided with a protection portion 100, so that the protection portion 100 protects the corresponding bent portion 93. Illustratively, the protective part 100 may extend onto the connection part 94, so that the protective part 100 may fill a gap between the connection part 94 and the electrode terminal 80 or a gap between the second transfer part 92 and the connection part 94. Like this, when second switching portion 92 is close to or keeps away from first switching portion 91 reciprocating motion, connecting portion 94 or the activity of second switching portion 92 diminishes to the portion of bending 93 self that corresponds warp the degree diminishes, and the stress fluctuation that self born diminishes, and then is favorable to reducing the fatigue stress that portion of bending 93 born, reduces portion of bending 93 and takes place fatigue damage and lead to self the cracked possibility of appearing.

It can be understood that the protection portion 100 may extend from the bending portion 93 to one of the first adaptor portion 91, the connecting portion 94 and the second adaptor portion 92, and the corresponding purpose and effect can be achieved, which is not described herein again.

In some embodiments, referring to fig. 16 and 17, the portion of the protection portion 100 extending to the connection portion 94 may cover the entire connection portion 94, so that the connection strength between the protection portion 100 and the adapter component 90 may be further improved, which is beneficial to further reduce the possibility that the protection portion 100 and the adapter component 90 are separated and fall off.

In some embodiments, the protective portion 100 is a sheet with a uniform thickness. The thickness of the protection portion 100 ranges from 0.02 mm to 0.2 mm. The smaller the bending size of the bent portion 93, that is, the shorter the arc length of the cross section of the bent portion 93, the smaller the thickness of the protector 100. The greater the bending dimension of the bent portion 93, that is, the longer the arc length of the cross section of the bent portion 93, the greater the thickness of the protector 100.

When the thickness of the protection portion 100 is greater than 0.2 mm, the rigidity of the protection portion 100 is high, so that when the switching component 90 is bent, the switching component 90 is not easy to bend in the area where the protection portion 100 is located to form the bending portion 93, and is easy to bend in the edge area of the protection portion 100 to form the bending portion 93, so that the positions of the protection portion 100 and the bending portion 93 are not corresponding, and the protection portion 100 cannot protect the bending portion 93. When the thickness of the protection portion 100 is less than 0.02 mm, the thickness of the protection portion 100 is small, and the rigidity of the protection portion 100 is poor, so that the effect of dispersing the stress of the bent portion 93 cannot be well performed.

In some embodiments, the interposer component 90 is a sheet-like structure having a predetermined length, width, and thickness. The thickness of the bent portion 93 may be selected in combination with the internal space of the battery cell 40 and the mechanical strength required for the adaptor member 90. At least one of opposite sides of the bent portion 93 in the thickness direction Z may be provided with a protection portion 100.

In some embodiments, the protection portion 100 has elasticity, so that the protection portion 100 is easy to bend, and the possibility that the bending difficulty of the bending portion 93 is increased by the protection portion 100 when the bending portion 93 and the protection portion 100 are bent at the same time is reduced.

In some embodiments, the adapter member 90 is a unitary structure. The adapter member 90 may be manufactured by stamping or die casting. The transition part 90 is not provided with a splicing transition part, so that the overall mechanical strength is high, and the possibility of fracture of the transition part 90 in the bending process and the subsequent use process is favorably reduced.

Referring to fig. 18, an embodiment of the present application further provides a method for manufacturing a battery cell 40, which includes:

providing an electrode terminal 80 and an electrode assembly 60;

providing an adapter member 90 including a first adapter portion 91, a second adapter portion 92 and at least one bending portion 93, the first adapter portion 91 being used for connecting with the electrode terminal 80, the second adapter portion 92 being used for connecting with the electrode assembly 60, the bending portion 93 being used for connecting the first adapter portion 91 and the second adapter portion 92;

a protection portion 100 is provided, and the protection portion 100 is disposed on at least a portion of the bending portion 93 to reduce deformation of the bending portion 93 during use.

In some embodiments, the protection part 100 is disposed on the adapter component 90 by thermal compounding or coating, so as to improve the connection strength and the connection stability between the protection part 100 and the adapter component 90, and reduce the possibility that the protection part 100 is separated from the adapter component 90, which may cause the failure of the protection part 100.

In some embodiments, the bending portion 93 is connected to the first transition portion 91 and the bending portion 93 is connected to the second transition portion 92. Alternatively, the adapter member 90 further includes a connection portion 94. The bent portion 93 connects the first transition portion 91 and the second transition portion 92 by a connection portion 94.

The battery cell 40 manufactured by the method of manufacturing the battery cell 40 according to the embodiment of the present application includes the electrode terminal 80, the electrode assembly 60, the adaptor member 90, and the protection part 100. The adaptor member 90 is connected to the electrode terminal 80 and the electrode assembly 60, respectively. The adapter member 90 includes a first adapter portion 91, a second adapter portion 92, and a bent portion 93. The first transfer portion 91 is used to connect with the electrode terminal 80, and the second transfer portion 92 is used to connect with the electrode assembly 60. The bent portion 93 is used to connect the first transition portion 91 and the second transition portion 92. The protection portion 100 is disposed at least in part of the bending portion 93. Protection portion 100 is used for reducing the deformation of the portion 93 of bending in the use to can improve the fatigue resistance of the portion 93 of bending, reduce the portion 93 of bending and take place fatigue damage and lead to self fracture possibility, and then reduce and lead to battery monomer 40 to appear the possibility of opening a circuit because of the portion 93 of bending breaks, effectively improve battery monomer 40's job stabilization nature and life.

Referring to fig. 19, an embodiment of the present application provides a manufacturing apparatus of a battery cell 40, which includes:

a first means 200 for providing the electrode terminal 80 and the electrode assembly 60;

a second device 300 for providing an adaptor member 90 including a first adaptor portion 91, a second adaptor portion 92 and at least one bending portion 93, the first adaptor portion 91 being for connection with the electrode terminal 80, the second adaptor portion 92 being for connection with the electrode assembly 60, the bending portion 93 being for connection between the first adaptor portion 91 and the second adaptor portion 92;

and a third device 400 for providing a protection portion 100, wherein the protection portion 100 is disposed at least a part of the bending portion 93 to reduce the deformation of the bending portion 93 during use.

The battery cell 40 manufactured by the manufacturing apparatus of the battery cell 40 according to the embodiment of the present application includes the electrode terminal 80, the electrode assembly 60, the adaptor member 90, and the protection part 100. The adaptor member 90 is connected to the electrode terminal 80 and the electrode assembly 60, respectively. The adapter member 90 includes a first adapter portion 91, a second adapter portion 92, and a bent portion 93. The first transfer portion 91 is used to connect with the electrode terminal 80, and the second transfer portion 92 is used to connect with the electrode assembly 60. The bent portion 93 is used to connect the first transition portion 91 and the second transition portion 92. The protection portion 100 is disposed at least in part of the bending portion 93. Protection portion 100 is used for reducing the deformation of the portion 93 of bending in the use to can improve the fatigue resistance of the portion 93 of bending, reduce the portion 93 of bending and take place fatigue damage and lead to self fracture possibility, and then reduce and lead to battery monomer 40 to appear the possibility of opening a circuit because of the portion 93 of bending breaks, effectively improve battery monomer 40's job stabilization nature and life.

While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, features shown in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (17)

1. A battery cell, comprising:

an electrode terminal;

an electrode assembly;

the electrode assembly comprises an electrode terminal, an electrode assembly body and an adapter part, wherein the adapter part comprises a first adapter part, a second adapter part and at least one bending part, the first adapter part is used for being connected with the electrode terminal, the second adapter part is used for being connected with the electrode assembly body, and the bending part is used for connecting the first adapter part and the second adapter part;

and the protection part is arranged on at least part of the bending part so as to reduce the deformation of the bending part in the use process.

2. The battery cell as recited in claim 1 wherein the protective portion extends from the bend portion to at least one of the first and second transition portions.

3. The battery cell according to claim 2, wherein a minimum thickness of a portion of the protection portion that exceeds the bending portion is larger than a maximum thickness of a portion of the protection portion that is provided at the bending portion.

4. The battery cell according to any one of claims 1 to 3, wherein the bent portion has a notch and opposite inner and outer side surfaces, the inner side surface is close to the notch, the outer side surface is far from the notch, the inner and outer side surfaces are both provided with the protection portion, and the protection portion exceeds an edge of the bent portion in a width direction of the bent portion, wherein portions of the protection portions on the inner and outer side surfaces that exceed the edge of the bent portion are connected.

5. The battery cell according to any one of claims 1 to 3, wherein the bending portion has a notch and opposite inner and outer sides, the inner side is close to the notch, the outer side is far from the notch, and the protection portion is disposed on the outer side of the bending portion.

6. The battery cell according to any one of claims 1 to 3, wherein a material of the protective portion is selected from materials resistant to electrolyte corrosion.

7. The battery cell according to any one of claims 1 to 3, wherein the protective portion has elasticity.

8. The battery cell according to any one of claims 1 to 3, wherein the protection portion is in thermocompression bonding connection with the adapter member; alternatively, the protection portion is formed on the adapter member using a coating process.

9. The battery cell according to claim 1, wherein the protective portion is a sheet body having a uniform thickness, and the thickness of the protective portion ranges from 0.02 mm to 0.2 mm.

10. The battery cell according to any one of claims 1 to 3, wherein the bending portion has a rigidity lower than a rigidity of the first transition portion and/or a rigidity of the second transition portion, so that the bending portion is easily deformed with respect to the first transition portion and/or the second transition portion.

11. The battery cell as recited in claim 10, wherein the bent portion has a reduced thickness region, and a maximum thickness of a portion of the protection portion disposed in the reduced thickness region is equal to or less than a reduced thickness of the bent portion in the reduced thickness region.

12. The battery cell according to any one of claims 1 to 3, wherein the adapter member further includes a connecting portion, and the bending portion connects the first adapter portion and the second adapter portion via the connecting portion.

13. The battery cell according to any one of claims 1 to 3, wherein the adapter member is of an integrally molded construction.

14. A battery comprising a cell according to any one of claims 1 to 13.

15. An electrical device comprising a battery according to claim 14 for providing electrical energy.

16. A method of manufacturing a battery cell, comprising:

providing an electrode terminal and an electrode assembly;

providing an adapter component comprising a first adapter part, a second adapter part and at least one bending part, wherein the first adapter part is used for being connected with the electrode terminal, the second adapter part is used for being connected with the electrode assembly, and the bending part is used for connecting the first adapter part and the second adapter part;

and providing a protection part which is arranged on at least part of the bending part to reduce the deformation of the bending part in the using process.

17. An apparatus for manufacturing a battery cell, comprising:

first means for providing an electrode terminal and an electrode assembly;

a second device for providing an interposer component including a first interposer portion, a second interposer portion and at least one bending portion, the first interposer portion being configured to be connected to the electrode terminal, the second interposer portion being configured to be connected to the electrode assembly, the bending portion being configured to connect the first interposer portion and the second interposer portion;

and the third device is used for providing a protection part which is arranged on at least part of the bending part so as to reduce the deformation of the bending part in the using process.

Images