CN220341475U - Battery monomer, battery and electric equipment - Google Patents

Abstract

The utility model discloses a battery monomer, a battery and electric equipment. An electrode terminal is arranged on the first wall of the shell; the electrode assembly is arranged in the shell and provided with a tab; the current collecting component is arranged between the electrode lug and the electrode terminal and comprises a first area, a second area and a fusing part, the fusing part is connected with the first area and the second area, the first area is connected with the electrode lug, the second area is connected with the electrode terminal, and a gap is reserved between the electrode lug and the second area after the fusing part is fused. After the fusing part of the current collecting member is fused, the first area is separated from the second area, and a gap between the tab and the second area enables the tab positioned on the first area and the electrode terminal positioned on the second area to be not conducted any more, so that a circuit in the battery unit is broken, and the risk of functional failure of the battery unit is reduced.

Description

Battery monomer, battery and electric equipment

Technical Field

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

Background

The automotive industry is an important pillar industry of national economy, and plays an important role in national economy and social development. The new energy industry is a strategic emerging industry, and the development of energy-saving automobiles is an effective measure for promoting energy conservation and emission reduction. For electric vehicles, battery technology is an important factor in its development.

The battery cell may include an electrode terminal, a tab, and a current collecting member for connecting the electrode terminal and the tab. When the overcurrent of the battery cell flows greatly, the current collecting member fuses to disconnect the circuit of the battery cell; however, during the use of the battery cell, the battery cell may shake, so that the circuit in the battery cell may be turned back on, resulting in functional failure of the battery cell.

Disclosure of Invention

The utility model provides a battery monomer, a battery and electric equipment, which can solve the problem that a circuit in the battery monomer can be conducted again to cause the functional failure of the battery monomer.

The battery cell according to an embodiment of the present utility model includes:

a case having an electrode terminal provided on a first wall thereof;

the electrode assembly is arranged in the shell and provided with a tab;

the current collecting member is arranged between the electrode lug and the electrode terminal, the current collecting member comprises a first area, a second area and a fusing part, the fusing part is connected with the first area and the second area, the first area is connected with the electrode lug, the second area is connected with the electrode terminal, and a gap is reserved between the electrode lug and the second area after the fusing part is fused.

In the battery cell of the embodiment of the utility model, after the fusing part of the current collecting member is fused, the first region is separated from the second region, and the gap between the tab and the second region enables the tab positioned on the first region and the electrode terminal positioned on the second region to be no longer conducted, so that a circuit in the battery cell is broken, and the risk of functional failure of the battery cell is reduced.

In some embodiments, the tab is located entirely on a side of the fuse portion facing the first region.

Therefore, after the fusing part is fused, the tab and the second area are not contacted, so that the tab and the electrode terminal are not electrically connected, and the risk of functional failure of the battery cell is reduced.

In some embodiments, a deformation element is connected to the first region, and after the fusing part is fused, the deformation element drives the first region to move along the thickness direction of the current collecting member so as to stagger the first region and the second region in the thickness direction of the current collecting member.

Therefore, the electrode lug and the second area are not on the same flat layer, the distance between the electrode lug and the second area is further, the size of a gap between the electrode lug and the second area is increased, the probability that the electrode lug is connected with the second area and conducted is reduced, and therefore the risk that the battery monomer is in functional failure is reduced.

In some embodiments, the deformation element drives the first region to move away from the first wall after the fuse portion is fused.

So, in the direction of keeping away from first wall, first region has great removal space, and the distance that first region moved is long to make the utmost point ear with clearance between the second region is bigger, has reduced the utmost point ear and the probability that the second region is connected and is switched on, and then reduces the battery monomer and take place the risk of functional failure.

In certain embodiments, the deformation element is at least partially disposed between the first region and the first wall. In this way, the space occupied by the deformation element coincides with the redundant space existing between the first region and the first wall, so that the space inside the battery cell is compact.

In some embodiments, one end of the deformation element is connected to the first region and the other end abuts the first wall.

Thus, the first wall can support the deformation element in the deformation process of the deformation element, and the deformation process of the deformation element is stable; in addition, the first wall may provide a counter force to the deforming member such that the deforming member may smoothly push the first region.

In some embodiments, the first wall includes a cover and an insulating member disposed on the cover, the insulating member being located between the cover and the electrode assembly, the other end of the deformation element abutting the insulating member.

Thus, the insulating member prevents the current collecting member from contacting the cover body, thereby preventing the battery cells from being shorted. In addition, the insulating member may also support the deforming element, and during deformation of the deforming element, the insulating member may remain stationary to deform the deforming element in a direction away from the first wall, thereby driving the first region to move in a direction away from the first wall.

In some embodiments, the deformation element includes an elastic member that deforms toward its natural state after the fusing part is fused to drive the first region to move in the thickness direction of the current collecting member.

Therefore, the elastic piece is easy to obtain, the first area is stably operated by the elastic piece driving mode, the cost of the mode is low, and the mass production is easy to realize.

In some embodiments, the deformation element includes a thermal expansion member that expands after the fusing point is fused to drive the first region to move in a thickness direction of the current collecting member.

Therefore, the thermal expansion piece can increase the distance between the second area and the first area after expansion, and the probability that the tab is connected with and conducted with the second area is reduced, so that the risk of functional failure of the battery cell is reduced.

In certain embodiments, the material of the thermal expansion member comprises at least one of a silicone, a rubber, and a polymeric material, and/or the thermal expansion member expands above a predetermined temperature, the predetermined temperature being greater than 80 ℃.

In this way, the thermal expansion member has a high expansion degree, which is beneficial to pushing the first area to move so as to increase the distance between the second area and the first area.

In certain embodiments, the thermal expansion member has a coefficient of thermal expansion that is greater than the coefficient of thermal expansion of the current collecting member.

In this way, the thermal expansion member is capable of driving the first region to move in the thickness direction of the current collecting member to a greater extent than the current collecting member.

In certain embodiments, the first region is partially embedded in the thermal expansion member. Thus, the connection area between the thermal expansion member and the first region is large, and the fitting process can stabilize the connection between the first region and the thermal expansion member.

In some embodiments, the deformation element and the tab are respectively located at different locations of the first region. In the production process, the deformation element and the current collecting member are usually integrally supplied materials, the tab and the first area are required to be clamped by the clamp during welding, then welding is carried out, and the deformation element and the tab are respectively located at different positions of the first area, so that the influence on the tab in the welding process can be reduced.

In some embodiments, the tab spans the fusing part and extends to the second region, the tab includes a connection portion corresponding to the second region, and a gap is formed between the connection portion and the second region after the fusing part is fused.

Therefore, the probability that the tab is connected with the second area and conducted is reduced by the gap between the connecting part and the second area, and then the risk that the battery monomer is in functional failure is reduced.

In some embodiments, the distance between the edge of the connecting portion distal from the fusing spot and the fusing spot is a first distance, and the distance that the first region moves away from the first wall after fusing of the fusing spot is a second distance, the second distance being greater than the first distance.

Because the tab is generally in a sheet structure, the tab is easy to deform such as tilting after being heated, and the tab is easy to overlap again in the second area under the condition that the tab is deformed towards the first wall direction, and the tab cannot overlap again with the second area even if the tab is deformed when the second distance is larger than the first distance.

In some embodiments, the tab is attached to a surface of the first region facing away from the first wall. The surface of the first region facing away from the first wall is adjacent to the electrode assembly, and the tab is disposed on the surface to facilitate connection with the electrode assembly.

The battery according to an embodiment of the present utility model includes the battery cell according to any one of the above embodiments.

The electric equipment provided by the embodiment of the utility model comprises the battery disclosed by the embodiment or the battery monomer disclosed by any embodiment.

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 present utility model will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the utility model;

FIG. 2 is an exploded view of a battery provided in some embodiments of the utility model;

fig. 3 is an exploded view of a battery cell according to some embodiments of the present utility model;

fig. 4 is a schematic view illustrating a connection relationship between a tab, a current collecting member and an electrode terminal according to some embodiments of the present utility model;

fig. 5 is an exploded view of a battery cell according to some embodiments of the present utility model;

FIG. 6 is a schematic illustration of a first void formation process provided by some embodiments of the present utility model;

Fig. 7 is an exploded view of a battery cell according to some embodiments of the present utility model;

fig. 8 is an exploded view of a battery cell according to some embodiments of the present utility model;

FIG. 9 is a schematic illustration of a first void formation process provided by some embodiments of the present utility model;

fig. 10 is a schematic structural view of a battery cell according to some embodiments of the present utility model;

FIG. 11 is a sectional view in the A-A direction of the battery cell of FIG. 10;

fig. 12 is an enlarged view of a portion a of the battery cell of fig. 11;

fig. 13 is a schematic structural view of a battery cell according to some embodiments of the present utility model;

fig. 14 is a schematic view illustrating a structure of a battery cell according to some embodiments of the present utility model;

fig. 15 is a B-B directional cross-sectional view of the battery cell of fig. 14;

fig. 16 is an enlarged view of a portion b of the battery cell of fig. 15;

FIG. 17 is a schematic diagram illustrating a connection relationship between tabs and current collecting members according to some embodiments of the present utility model;

FIG. 18 is a schematic diagram illustrating a connection relationship between tabs and current collecting members according to some embodiments of the present utility model;

FIG. 19 is a schematic view of a connection relationship between a tab and a current collecting member according to some embodiments of the present utility model;

FIG. 20 is a schematic illustration of a process for forming a second void according to some embodiments of the present utility model, as shown in FIG. 9.

Description of main reference numerals:

a battery cell 100; a housing 10; a first wall 11; an electrode terminal 12; a second wall 13; an electrode assembly 20; a tab 21; a current collecting member 30; a first region 31; a second region 32; a fusing part 33; a first void 101; a deforming member 40; a cover 110; an insulating member 111; an elastic member 41; a thermal expansion member 42; a connection portion 210; a second void 102; a battery 200; a vehicle 1000; a controller 300; a motor 400; a case 201; a first portion 202; a second portion 203.

Detailed Description

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

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", 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 referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

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 connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, 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 indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The following disclosure provides many different embodiments, or examples, for implementing different features of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

Currently, the more widely the battery is used in view of the development of market situation. The battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and the like, as well as a plurality of fields such as military equipment, aerospace, and the like. With the continuous expansion of the battery application field, the market demand thereof is also continuously expanding.

The applicant has noted that when the overcurrent of the battery cell is large, the current collecting member fuses, thereby breaking the circuit between the electrode terminal and the tab, and avoiding overcharge of the battery. However, during the use of the battery cell, the battery cell may shake, so that the circuit in the battery cell may be turned back on, thereby causing the battery cell to fail. The inventors have further studied and found that the cause of the re-conduction of the circuit in the battery cell is mainly due to the fact that the tab of the battery cell may overlap with the portion of the current collecting member after fusing, which is connected to the electrode terminal.

In order to solve the problem that the tab of the battery cell may overlap with the portion connected with the electrode terminal in the fused current collecting member again to cause the functional failure of the battery cell, the applicant researches and discovers that a first gap is formed between the region where the electrode terminal is located and the region where the tab is located after the current collecting member is fused in design, so that the breakdown performance of the current collecting member is improved, the risk that the current collecting member is broken down by reverse high voltage is further reduced, the probability that the current collecting member is reconnected and conducted is reduced, and the risk that the functional failure of the battery cell occurs is reduced.

Based on the above considerations, the applicant has conducted intensive studies to design a battery cell including a case, an electrode assembly, and a current collecting member. An electrode terminal is arranged on the first wall of the shell; the electrode assembly is arranged in the shell and provided with a tab; the current collecting component is arranged between the electrode lug and the electrode terminal and comprises a first area, a second area and a fusing part, the fusing part is connected with the first area and the second area, the first area is connected with the electrode lug, the second area is connected with the electrode terminal, and a gap is reserved between the electrode lug and the second area after the fusing part is fused. Therefore, a circuit in the battery cell is broken through a gap formed between the tab and the second area, and the risk of functional failure of the battery cell is reduced.

The electric equipment in the embodiment of the utility model uses a battery or a battery monomer as a power supply, and can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiments will take an electric device according to an embodiment of the present utility model as an example of the vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the utility model. The battery 200 is provided in the interior of the vehicle 1000, and the battery 200 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 200 may be used for power supply of the vehicle 1000, for example, the battery 200 may be used as an operating power source of the vehicle 1000.

The vehicle 1000 may also include a controller 300 and a motor 400, the controller 300 being configured to control the battery 200 to power the motor 400, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In an embodiment of the present utility model, the battery 200 may be used not only as an operating power source for the vehicle 1000 but also as a driving power source for the vehicle 1000 to supply driving power to the vehicle 1000 instead of or in part of fuel oil or natural gas.

Referring to fig. 2, fig. 2 is an exploded view of a battery 200 according to some embodiments of the present utility model. The battery 200 includes a battery cell 100 and a case 201, and the case 201 is used to accommodate the battery cell 100.

In the embodiment of the present utility model, the battery cell 100 may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited by the embodiment of the present utility model. The battery cell 100 may have a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, etc., which are not limited thereto according to the embodiment of the present utility model. The battery cells 100 are generally divided into three types in a package manner: the cylindrical battery cell, the prismatic battery cell, and the pouch battery cell, to which the embodiment of the present utility model is not limited.

The battery 200 according to the embodiment of the present utility model refers to a single physical module including one or more battery cells 100 to provide higher voltage and capacity. For example, the battery 200 mentioned in the embodiment of the present utility model may include a battery module or a battery pack, etc. The battery 200 generally includes a case 201 for enclosing one or more battery cells 100. The case 201 can prevent the liquid or other foreign matter from affecting the charge or discharge of the battery cell 100.

The case 201 is a component for accommodating the battery cell 100, the case 201 provides an accommodating space for the battery cell 100, and the case 201 may have various structures. In some embodiments, the case 201 may include a first portion 202 and a second portion 203, and the first portion 202 and the second portion 203 are overlapped with each other to define a receiving space for receiving the battery cell 100. The first portion 202 and the second portion 203 may be of various shapes, such as a rectangular parallelepiped, a cylinder, etc. The first portion 202 may be a hollow structure with one side opened, and the second portion 203 may be a hollow structure with one side opened, and the open side of the second portion 203 is closed to the open side of the first portion 202, so as to form the case 201 having the accommodating space. The first portion 202 may be a hollow structure with one side open, the second portion 203 may be a plate-like structure, and the second portion 203 may be covered on the open side of the first portion 202 to form a case 201 having an accommodating space. The first portion 202 and the second portion 203 may be sealed by a sealing element, which may be a sealing ring, a sealant, or the like.

In the battery 200, when the number of the battery cells 100 is plural, the plurality of battery cells 100 may be connected in series, parallel, or series-parallel, and series-parallel refers to both of the plurality of battery cells 100 being connected in series and parallel. The plurality of battery cells 100 may be connected in series or parallel or in series-parallel to form a battery module, and then connected in series or parallel or in series-parallel to form a whole and be accommodated in the case 201. All the battery cells 100 may be directly connected in series, parallel or series-parallel, and then the whole body formed by all the battery cells 100 is accommodated in the case 201.

In some embodiments, the battery 200 may further include a bus member through which the plurality of battery cells 100 may be electrically connected to each other to realize serial connection or parallel connection or series-parallel connection of the plurality of battery cells 100. The bus member may be a metal conductor such as copper, iron, aluminum, stainless steel, aluminum alloy, or the like.

Referring to fig. 3 to 6, fig. 3 is an exploded view of a battery cell 100 according to some embodiments of the present utility model, fig. 4 is a connection relationship diagram of a tab 21, a current collecting member 30 and an electrode terminal 12 according to some embodiments of the present utility model, fig. 5 is an exploded view of a battery cell 100 according to some embodiments of the present utility model, and fig. 6 is a schematic view of a process of forming a first gap 101 according to some embodiments of the present utility model. The battery cell 100 of the embodiment of the present utility model includes a case 10, an electrode assembly 20, and a current collecting member 30. The first wall 11 of the case 10 is provided with an electrode terminal 12; the electrode assembly 20 is disposed in the case 10 and provided with a tab 21; the current collecting member 30 is disposed between the tab 21 and the electrode terminal 12, the current collecting member 30 includes a first region 31, a second region 32, and a fusing part 33, the fusing part 33 connects the first region 31 and the second region 32, the first region 31 connects the tab 21, the second region 32 connects the electrode terminal 12, and a first gap 101 is provided between the tab 21 and the second region 32 after the fusing part 33 is fused.

Specifically, the case 10 is a member for accommodating the electrode assembly 20, and the case 10 may include a second wall 13, and the second wall 13 may be a hollow structure having one end formed to be open, or the second wall 13 may be a hollow structure having opposite ends formed to be open. The housing 10 may be of various shapes, such as a cylinder, a rectangular parallelepiped, etc. The material of the housing 10 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

The electrode assembly 20 is a component in which electrochemical reactions occur in the battery cell 100. The electrode assembly 20 may include a positive electrode sheet, a negative electrode sheet, and a separator. The electrode assembly 20 may be a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, or may be a laminated structure formed by stacking a positive electrode sheet, a separator, and a negative electrode sheet.

The tab 21 of the electrode assembly 20 may be disposed toward the first wall 11 of the case 10 with a certain interval between the tab 21 and the first wall 11. The first wall 11 is a member closing the opening of the case 10 to isolate the internal environment of the battery cell 100 from the external environment. The first wall 11 may include a recess region thereon, and the electrode terminal 12 may be disposed in the recess region and toward the outside of the case 10. The first wall 11 defines a sealed space together with the case 10 for accommodating the electrode assembly 20, the electrolyte, and other components. The first wall 11 may be welded to the housing 10 to close the opening of the housing 10. The shape of the first wall 11 may be adapted to the shape of the housing 10, for example, the housing 10 is a rectangular parallelepiped structure, the first wall 11 is a rectangular plate structure adapted to the housing 10, for example, the housing 10 is a cylinder, and the first wall 11 is a circular plate structure adapted to the housing 10. The material of the first wall 11 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

In an embodiment in which the housing 10 is a hollow structure having an opening formed at one end, the first wall 11 may be provided one corresponding thereto; in an embodiment in which the housing 10 is a hollow structure with openings formed at both ends, the first walls 11 may be provided correspondingly in two.

The current collecting member 30 is a structure in which the electrode terminals 12 and the electrode assemblies 20 are connected in the battery cell 100, and the tabs 21 and the electrode terminals 12 may be connected to both end surfaces of the current collecting member 30, respectively, in the first direction v. In the second direction h, the current collecting member 30 may be divided into a first region 31, a fusing part 33, and a second region 32, and the first region 31, the second region 32, and the fusing part 33 may be integrally formed or may be separately formed. For example, the current collecting member 30 is integrally formed, and the first and second regions 31 and 32 are connected to both ends of the fusing part 33 in the second direction h, respectively. The fusing part 33 may be made of a different material from the first and second regions 31 and 32, for example, the fusing part 33 may have a low melting point, and the fusing part 33 may be easily fused under a high current condition. The fusing part 33 may be formed by cutting a groove in the current collecting member 30, so that the fusing part 33 has a small cross-sectional area, a large resistance, and is easily fused.

The first region 31 may be in direct contact with the tab 21, and the second region 32 may be in direct contact with the electrode terminal 12, thereby generating a current between the tab 21 and the electrode terminal 12. After the fusing part 33 is fused, the first region 31 is separated from the second region 32, so that a first gap 101 is formed between the tab 21 and the second region 32, the first gap 101 between the tab 21 and the second region 32 enables the tab 21 positioned on the first region 31 and the electrode terminal 12 positioned on the second region 32 not to be conducted any more, and a circuit in the battery cell 100 is broken, so that the risk of functional failure of the battery cell 100 is reduced.

Referring to fig. 4, in some embodiments, the tab 21 is located entirely on a side of the fusing part 33 facing the first region 31.

In this way, after the fusing part 33 is fused, the tab 21 is no longer in contact with the second region 32, so that the tab 21 is no longer electrically connected with the electrode terminal 12, thereby reducing the risk of functional failure of the battery cell 100.

Referring to fig. 7, 8 and 9, fig. 7 is an exploded view of a battery cell 100 according to some embodiments of the present utility model, fig. 8 is an exploded view of a battery cell 100 according to some embodiments of the present utility model, and fig. 9 is a schematic view of a process of forming a first gap 101 according to some embodiments of the present utility model. In some embodiments, the deformation element 40 is connected to the first region 31, and after the fusing part 33 is fused, the deformation element 40 drives the first region 31 to move along the thickness direction of the current collecting member 30, so that the first region 31 and the second region 32 are staggered in the thickness direction of the current collecting member 30.

In particular, the deformation element 40 may be an element that deforms by means of electrical energy, potential energy, thermal energy or kinetic energy. The deforming member 40 may be in an initial state and a deformed state. For example, the deforming member 40 may be in a compressed state, with the deforming member 40 having a smaller dimension in the compressed state than in the initial state, along the first direction v.

After fusing off the fusing part 33, the deformation element 40 may be deformed in a first direction v, which is parallel to the thickness direction of the current collecting member 30, to thereby drive the first region 31 to move in the thickness direction of the current collecting member 30. During the movement of the first region 31, the distance between the first region 31 and the second region 32 increases until the deformation element 40 reaches its upper deformation limit, at which time a first gap 101 is formed between the tab 21 and the second region 32.

In this way, the tab 21 and the second region 32 are not on the same flat layer, and the distance between the tab 21 and the second region 32 is further, so that the size of the first gap 101 between the tab 21 and the second region 32 is increased, and the probability that the tab 21 is connected with and conducted with the second region 32 is reduced, thereby reducing the risk of functional failure of the battery cell 100.

Referring to fig. 7 and 8, in some embodiments, after the fusing part 33 is fused, the deformation element 40 drives the first region 31 to move away from the first wall 11.

In particular, the deformation element 40 may rest against the surface of the first wall 11 facing the first zone 31 and be fixedly connected to the first zone 31, the deformation element 40 being in a compressed state. After the fusing part 33 is fused, the first region 31 is separated from the second region 32, the pressure applied to the deformation element 40 by the first region 31 is reduced, the position of the first wall 11 is unchanged, the force applied to the deformation element 40 is still continuously applied, the stress balance between the first region 31 and the deformation element 40 is broken, the force applied to the first region 31 by the deformation element 40 is larger than the pressure applied to the deformation element 40 by the first region 31, and the first region 31 moves away from the first wall 11 under the action of the deformation element 40.

In this way, in the direction away from the first wall 11, the first area 31 has a larger movement space, and the distance that the first area 31 moves is long, so that the first gap 101 between the tab 21 and the second area 32 is larger, thereby reducing the probability that the tab 21 is connected and conducted with the second area 32, and further reducing the risk of functional failure of the battery cell 100.

In some embodiments, deformation element 40 drives first region 31 in a direction toward first wall 11 after fuse portion 33 is fused. The deformation member 40 may be disposed at a side of the first region 31 adjacent to the electrode assembly 20 and abuts against the electrode assembly 20, and after the fusing part 33 is fused, the deformation member 40 may be deformed to drive the first region 31 to move in a direction approaching the first wall 11. In this embodiment, there may be a gap between the first wall 11 and the electrode assembly 20 to provide a space for the first region 31 to move toward the first wall 11. For example, the first wall 11 may include a cover 110 and an insulating member 111 disposed on the cover 110, the insulating member 111 being positioned between the cover 110 and the electrode assembly 20, and a groove may be disposed on the insulating member 111, the groove may provide a space for the first region 31 to move closer to the first wall 11. After the first region 31 is moved in a direction approaching the first wall 11, the first region 31 may be accommodated in the groove.

Referring to fig. 10, 11 and 12, fig. 10 is a schematic structural view of a battery cell 100 according to some embodiments of the present utility model, fig. 11 is a cross-sectional view of the battery cell 100 in A-A direction of fig. 10, and fig. 12 is an enlarged view of a portion a of the battery cell 100 in fig. 11.

In certain embodiments, the deforming member 40 is at least partially disposed between the first region 31 and the first wall 11.

In particular, in the first direction v, the deformation element 40 can be fixedly connected to the first region 31 and rest against the first wall 11. In this way, the space occupied by the deformation element 40 coincides with the redundant space existing between the first region 31 and the first wall 11, so that the space inside the battery cell 100 is compact.

Referring to fig. 12, in some embodiments, one end of the deformation element 40 is connected to the first region 31, and the other end abuts against the first wall 11.

In particular, in the first direction v, one end of the deformation element 40 may be fixedly connected to the first region 31 and the other end may rest against the first wall 11.

In this way, the first wall 11 can support the deformation element 40 during deformation of the deformation element 40, the deformation process of the deformation element 40 being stable. In addition, the first wall 11 may provide a reverse force to the deforming member 40 so that the deforming member 40 may smoothly push the first region 31.

In some embodiments, the other end of the deforming member 40 may be connected to the first wall 11, for example, the other end of the deforming member 40 may be fixed to the first wall 11 by bonding or the like.

Referring to fig. 12, in some embodiments, the first wall 11 includes a cap 110 and an insulating member 111 disposed on the cap 110, the insulating member 111 is located between the cap 110 and the electrode assembly 20, and the other end of the deformation element 40 abuts against the insulating member 111.

Specifically, the cap body 110 serves to cover the opening of the case 10, and an insulating member 111 may be provided at a side of the cap body 110 facing the electrode assembly 20, the insulating member 111 serving to insulate the cap body 110 from the electrode assembly 20, preventing the short circuit from occurring inside the battery cell 100.

The insulating member 111 may also be used to support the deforming element 40, and the insulating member 111 may remain stationary during deformation of the deforming element 40 to deform the deforming element 40 in a direction away from the first wall 11, thereby driving the first region 31 to move in a direction away from the first wall 11.

Referring to fig. 10, 11 and 12, in some embodiments, the deformation element 40 includes an elastic member 41, and after the fusing part 33 is fused, the elastic member 41 deforms to its natural state to drive the first region 31 to move along the thickness direction of the current collecting member 30.

Specifically, the elastic member 41 may be deformed according to its own stress condition. The elastic member 41 may be a spring, an elastic block, or the like. The elastic element 41 can be fixedly connected to the first region 31 and rest against the first wall 11. The natural state of the elastic member 41 is a state in which the elastic member 41 is not subjected to external force. When the elastic member 41 contacts the first region 31, the elastic member is compressed by the force of the first region 31, and when the fuse portion 33 is melted, the first region 31 is separated from the second region 32, and the force applied to the elastic member 41 by the first region 31 is removed, so that the elastic member 41 deforms to its natural state to drive the first region 31 to move in the thickness direction of the current collecting member 30.

In this way, the elastic member 41 is easily obtained, and the first region 31 is smoothly operated by the driving of the elastic member 41, and the cost of the manner is low, which is easy for mass production.

It should be noted that, after the elastic member 41 pushes the first area 31, the elastic member 41 may not be in its natural state.

In some embodiments, when the elastic member 41 is disposed between the first region 31 and the electrode assembly 20, the elastic member 41 may be deformed from the extended state to the natural state, thereby pulling the first region 31 to move in a direction away from the first wall 11.

In addition, in some embodiments, when the elastic member 41 is disposed between the first region 31 and the electrode assembly 20, the elastic member 41 may be deformed from a compressed state to a natural state, thereby pushing the first region 31 to move in a direction approaching the first wall 11.

Referring to fig. 13, fig. 13 is a schematic diagram illustrating a structure of a battery cell 100 according to some embodiments of the utility model.

In some embodiments, deforming element 40 includes a thermal expansion member 42, and thermal expansion member 42 expands after fusing of fusing point 33 to drive first region 31 to move in the thickness direction of current collecting member 30.

Specifically, the thermal expansion member 42 is a member that expands with an increase in temperature, the thermal expansion member 42 may be fixedly connected to the second region 32, and the expansion direction of the thermal expansion member 42 may be parallel to the thickness direction of the current collecting member 30. After the fusing part 33 is fused, the fusing part 33 releases a large amount of heat, causing the temperature of the periphery of the thermal expansion member 42 to rise, thereby causing the thermal expansion member 42 to expand, and thus driving the first region 31 to move in the thickness direction of the current collecting member 30.

In this manner, thermal expansion member 42 may increase the distance between second region 32 and first region 31 after expansion, reducing the probability of current collecting member 30 reconnecting and conducting, thereby reducing the risk of functional failure of battery cell 100.

In certain embodiments, the material of thermal expansion member 42 comprises at least one of silicone, rubber, and polymeric materials; and/or the thermal expansion member 42 expands above a predetermined temperature, which is greater than 80 ℃.

Specifically, the polymer material may be polyethylene, polypropylene, or the like. After the fusing part 33 is fused, the released heat promotes the rise of the ambient air temperature and the temperature of the second region 32, and further causes the thermal expansion member 42 to expand by itself having a temperature greater than 80 ℃ after absorbing the heat.

When the temperature is less than 80 ℃, the degree of expansion of the thermal expansion member 42 is low, the first region 31 cannot be driven to move in the thickness direction of the current collecting member 30, or the distance between the second region 32 and the first region 31 cannot be effectively increased.

In this way, the thermal expansion member 42 has a high degree of expansion, which is advantageous in pushing the first region 31 to move to increase the distance between the second region 32 and the first region 31.

In certain embodiments, the coefficient of thermal expansion member 42 is greater than the coefficient of thermal expansion of current collecting member 30. As such, the thermal expansion member 42 expands to a greater extent than the current collecting member 30, and the thermal expansion member 42 is capable of driving the first region 31 to move in the thickness direction of the current collecting member 30.

Referring to fig. 14, 15 and 16, fig. 14 is a schematic structural view of a battery cell 100 according to some embodiments of the present utility model, fig. 15 is a B-B cross-sectional view of the battery cell 100 of fig. 14, and fig. 16 is an enlarged view of a portion B of the battery cell 100 of fig. 15.

In certain embodiments, the first region 31 is partially embedded in the thermal expansion member 42.

Specifically, the thermal expansion member 42 may be made of a non-metal material, and the current collecting member 30 may be made of a metal material, and thus, the thermal expansion member 42 and the current collecting member 30 are different in material, and have weak adhesion, so that the thermal expansion member 42 is difficult to be fixed to the surface of the thermal expansion member 42. In this way, the first region 31 and the thermal expansion member 42 may be fixed together by the fitting structure.

For example, the thermal expansion member 42 may be provided with a channel having a width that is less than or equal to the thickness of the first region 31 such that a transition or interference fit connection is formed between the channel and the first region 31.

Therefore, the first region 31 is partially embedded in the thermal expansion member 42, the connection area of the thermal expansion member 42 and the first region 31 is large, and the fitting process can stabilize the connection of the first region 31 and the thermal expansion member 42.

Referring to fig. 17 and 18, fig. 17 is a schematic diagram of a connection relationship between a tab 21 and a current collecting member 30 according to some embodiments of the present utility model, and fig. 18 is a schematic diagram of a connection relationship between a tab 21 and a current collecting member 30 according to some embodiments of the present utility model.

In some embodiments, the deformation element 40 and the tab 21 are respectively located at different locations of the first region 31.

Specifically, the deformation element 40 and the tab 21 are respectively located at different positions of the first region 31, and may be such that the deformation element 40 and the first region 31 do not overlap or overlap less in the thickness direction of the current collecting member 30. For example, the overlapping portion is less than one half of the area of the connection of the deformation element 40 with the current collecting member 30.

In the production process, the deformation element 40 and the current collecting member 30 are usually integrally supplied materials, the tab 21 needs to be clamped by a clamp when being welded with the first area 31, and then welding is performed, and the deformation element 40 and the tab 21 are respectively positioned at different positions of the first area 31, so that the influence on the tab 21 in the welding process can be reduced.

In some embodiments, where the deformation element 40 and the tab 21 are respectively located at different positions of the first region 31, the deformation element 40 may be disposed at an end of the first region 31 away from the second region 32, so that interference between the deformation element 40 and the tab 21 is small.

Referring to fig. 19, fig. 19 is a schematic diagram illustrating a connection relationship between the tab 21 and the current collecting member 30 according to some embodiments of the present utility model.

In some embodiments, the tab 21 spans the fusing part 33 and extends to the second region 32, and the tab 21 includes a connection portion 210 corresponding to the second region 32, and after the fusing part 33 is fused, a second gap 102 is formed between the connection portion 210 and the second region 32.

Specifically, during the welding process of the tab 21 and the first region 31, the tab 21 may span the second region 32 due to manufacturing errors, so that the tab 21 may connect the first region 31 and the second region 32 at the same time, and at this time, along the second direction h, the connection portion 210 is located at an end of the tab 21 near the second region 32. After the fusing part 33 is fused, the connection part 210 is separated from the second region 32, and the second gap 102 is formed between the connection part 210 and the second region 32.

In this way, the second gap 102 between the connection portion 210 and the second region 32 reduces the probability of connecting and conducting the tab 21 and the second region 32, thereby reducing the risk of functional failure of the battery cell 100.

Referring to fig. 20, fig. 20 is a schematic diagram illustrating a process of forming the second gap 102 according to some embodiments of the present utility model and fig. 9 is a schematic diagram illustrating a process of forming the second gap 102 according to some embodiments of the present utility model. In some embodiments, the distance between the edge of the connecting portion 210 away from the fusing part 33 and the fusing part 33 is a first distance L1, and the distance that the first region 31 moves away from the first wall 11 after the fusing part 33 is fused is a second distance L2, the second distance L2 being greater than the first distance L1 (L2 > L1).

Since the tab 21 is generally of a sheet structure, the tab 21 is easily deformed such as to be tilted after being heated, and when the tab 21 is deformed in the direction of the first wall 11, the tab 21 is easily overlapped again with the second region 32, and when the second distance L2 is greater than the first distance L1, the tab 21 is not overlapped again with the second region 32 even if being deformed.

Referring to fig. 20, in some embodiments, the tab 21 is connected to a surface of the first region 31 facing away from the first wall 11. The surface of the first region 31 facing away from the first wall 11 is adjacent to the electrode assembly 20, and the tab 21 is disposed on the surface to facilitate connection with the electrode assembly 20.

Specifically, the tab 21 may connect a portion of the surface of the first region 31 facing away from the first wall 11, or may connect the entire surface of the first region 31 facing away from the first wall 11.

In the description of the present specification, reference to the terms "one embodiment," "certain 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 (18)

1. A battery cell, comprising:

a case having an electrode terminal provided on a first wall thereof;

the electrode assembly is arranged in the shell and provided with a tab;

the current collecting member is arranged between the electrode lug and the electrode terminal, the current collecting member comprises a first area, a second area and a fusing part, the fusing part is connected with the first area and the second area, the first area is connected with the electrode lug, the second area is connected with the electrode terminal, and a gap is reserved between the electrode lug and the second area after the fusing part is fused.

2. The battery cell of claim 1, wherein the tab is located entirely on a side of the fuse portion that faces the first region.

3. The battery cell according to claim 1 or 2, wherein a deformation element is connected to the first region, and the deformation element drives the first region to move in the thickness direction of the current collecting member after the fusing part is fused, so that the first region and the second region are offset in the thickness direction of the current collecting member.

4. A battery cell as in claim 3, wherein the deformation element drives the first region to move away from the first wall after the fuse portion is fused.

5. The battery cell of claim 4, wherein the deformation element is disposed at least partially between the first region and the first wall.

6. The battery cell of claim 5, wherein one end of the deformation element is connected to the first region and the other end abuts the first wall.

7. The battery cell of claim 6, wherein the first wall includes a cover and an insulating member disposed on the cover, the insulating member being located between the cover and the electrode assembly, the other end of the deformation element abutting the insulating member.

8. A battery cell according to claim 3, wherein the deformation element includes an elastic member that deforms toward its natural state after the fusing part is fused to drive the first region to move in the thickness direction of the current collecting member.

9. The battery cell as recited in claim 3, wherein the deformation element includes a thermal expansion member that expands after the fusing point is fused to drive the first region to move in a thickness direction of the current collecting member.

10. The battery cell of claim 9, wherein the thermal expansion member is formed from a non-metallic material; and/or the thermal expansion member expands at a temperature greater than a predetermined temperature, the predetermined temperature being greater than 80 ℃.

11. The battery cell of claim 9, wherein the thermal expansion member has a coefficient of thermal expansion that is greater than a coefficient of thermal expansion of the current collecting member.

12. The battery cell of claim 9, wherein the first region is partially embedded in the thermal expansion member.

13. The battery cell of claim 3, wherein the deformation element and the tab are each located at a different location of the first region.

14. The battery cell of claim 1, wherein the tab spans the fuse portion and extends to the second region, the tab including a connection portion corresponding to the second region, the connection portion having a gap with the second region after the fuse portion is fused.

15. The battery cell of claim 14, wherein a distance between an edge of the connecting portion distal from the fuse portion and the fuse portion is a first distance, and wherein the first region moves away from the first wall a second distance after the fuse portion is fused, the second distance being greater than the first distance.

16. The battery cell of claim 1, wherein the tab is attached to a surface of the first region facing away from the first wall.

17. A battery comprising the battery cell of any one of claims 1-16.

18. A powered device comprising the battery of claim 17 or the battery cell of any one of claims 1-16.