WO2023130238A1

WO2023130238A1 - Battery cell and manufacturing method and manufacturing system therefor, and battery and electric device

Info

Publication number: WO2023130238A1
Application number: PCT/CN2022/070209
Authority: WO
Inventors: 王红; 刘江; 周健; 张楠; 鲁力
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-01-05
Filing date: 2022-01-05
Publication date: 2023-07-13
Also published as: CN116941105A

Abstract

Disclosed in the embodiments of the present application are a battery cell and a manufacturing method and manufacturing system therefor, and a battery and an electric device. The battery cell of the present application comprises a shell, an electrode assembly, and a support member. The electrode assembly is accommodated inside the shell. The support member is accommodated inside the shell and is provided with a recess, which is used for accommodating at least part of the electrode assembly, so as to limit the deformation of the electrode assembly. The recess of the support member can accommodate at least part of the electrode assembly; and when the battery cell is vibrated or squeezed, the support member can limit the deformation of the electrode assembly, and reduce misalignment between electrode plates of the electrode assembly, such that the risk of metal ion precipitation is reduced, and the usability and safety of the battery cell are improved.

Description

Battery cell, manufacturing method and system thereof, battery, and electrical device

technical field

The present application relates to the field of battery technology, and more specifically, to a battery cell, a manufacturing method and system thereof, a battery, and an electrical device.

Background technique

Battery cells are widely used in electronic equipment, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc. The battery cells may include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, secondary alkaline zinc-manganese battery cells, and the like.

In the development of battery technology, how to improve the performance of battery cells is a research direction in battery technology.

Contents of the invention

The present application provides a battery cell, its manufacturing method and manufacturing system, a battery and an electrical device, which can improve the performance of the battery cell.

In a first aspect, an embodiment of the present application provides a battery cell, including a casing, an electrode assembly, and a supporting member. The electrode assembly is housed in the case. The support member is accommodated in the casing and has a recess for receiving at least part of the electrode assembly to limit deformation of the electrode assembly.

In the above solution, the concave part of the support member can accommodate at least part of the electrode assembly, and when the battery cell is shaken or squeezed, the support member can limit the deformation of the electrode assembly, reduce the dislocation between the pole pieces of the electrode assembly, and reduce the metal The risk of ion precipitation can be improved, the performance of battery cells can be improved, and the safety of battery cells can be improved.

In some embodiments, the electrode assembly includes a plurality of first pole pieces and a plurality of second pole pieces, and the plurality of first pole pieces and the plurality of second pole pieces are alternately stacked along a direction perpendicular to the bottom surface of the concave portion.

In some embodiments, the electrode assembly includes a first pole piece and a plurality of second pole pieces, the first pole piece is bent continuously and includes a plurality of laminated sections and a plurality of bent sections, a plurality of laminated sections and a plurality of second pole pieces The pole pieces are alternately stacked along a direction perpendicular to the bottom surface of the recess, and each bent section is used to connect two adjacent stacked sections.

In some embodiments, the electrode assembly is formed by stacking a first pole piece and a second pole piece within a recess.

The above solution directly stacks the first pole piece and the second pole piece in the concave part to form an electrode assembly, so that in the subsequent transportation, assembly, and use of the electrode assembly, the supporting member can effectively support the electrode assembly and limit the electrode assembly. The deformation, so as to ensure the performance and safety performance of the electrode assembly.

In some embodiments, the support member includes a support plate and two first side plates. The support plate is against the electrode assembly. The two first side plates are respectively connected to both ends of the support plate along the first direction, the two first side plates and the support plate are used to enclose a recess, and the first side plates are used to limit the movement of the electrode assembly in the first direction .

In the above solution, the two first side plates can restrict the electrode assembly from both sides, so as to reduce the deformation of the electrode assembly and the misalignment between the first pole piece and the second pole piece when the battery cell vibrates, and improve the stability of the electrode assembly. Use performance and security. The support plate can support the electrode assembly during the process of installing the electrode assembly into the casing, and the two first side plates can protect the electrode assembly from both sides, reducing the risk of the electrode assembly being scratched by the casing.

In some embodiments, the support plate is provided with a first through hole, and the first through hole is used for communicating the recess with the space on the side of the support plate away from the electrode assembly.

In the above solution, the electrolyte in the casing can pass through the first through hole and soak the electrode assembly, thereby improving the performance of the electrode assembly. The first through hole can also reduce the weight of the support member and reserve more space for the electrolyte, so that the casing can accommodate more electrolyte.

In some embodiments, there are multiple first through holes.

In the above solution, the plurality of first through holes can allow the electrolyte to infiltrate multiple regions of the electrode assembly, which can improve the consistency of the performance of the electrode assembly.

In some embodiments, the support plate includes a plurality of first bar-shaped portions extending along a first direction and a plurality of second bar-shaped portions extending along a second direction, the second direction being perpendicular to the first direction. A plurality of first bar-shaped parts and a plurality of second bar-shaped parts are intersected to form a plurality of first through holes.

In the above solution, the rigidity of the support plate is ensured under the premise of forming the first through holes by intersecting the multiple first strip-shaped portions and the multiple second strip-shaped portions, so as to effectively support the electrode assembly.

In some embodiments, the first side plate is provided with a second through hole, and the second through hole is used for communicating the recess with the space on the side of the first side plate away from the electrode assembly.

In the above solution, the electrolyte in the casing can pass through the second through hole and infiltrate the electrode assembly, thereby improving the performance of the electrode assembly. The second through hole can also reduce the weight of the support member and reserve more space for the electrolyte, so that the casing can accommodate more electrolyte.

In some embodiments, the thickness of the support plate is greater than the thickness of the first side plate.

In the above solution, the support plate has a relatively large thickness and strength, so the support plate can support the electrode assembly during the process of installing the electrode assembly into the casing, reducing the deformation of the support plate under the gravity of the electrode assembly; because the first side The plate is used to limit the movement of the electrode assembly along the first direction without supporting the electrode assembly, so the first side plate can have a smaller thickness to reduce the volume and weight of the supporting member and increase the energy density of the battery cell.

In some embodiments, the angle between the support plate and the first side plate is 80°-100°.

In some embodiments, the electrode assembly includes a main body and a first tab led out from an end of the main body along the second direction, at least part of the main body is accommodated in the recess, at least part of the first tab extends out of the recess, and the second One direction is perpendicular to the second direction.

In the above solution, at least part of the first tab protrudes from the recess, so as to prevent the support member from interfering with the connection between the first tab and other conductive structures. The support member can reduce the shaking range of the main body when the battery cell vibrates, reducing the risk of tearing the first tab.

In some embodiments, the size of the main body along the second direction is 150mm-2000mm.

In the above solution, the size of the battery cells along the second direction is long enough to match the size of the box, and multiple battery cells can be directly arranged side by side in the box without first assembling the battery cells into a battery module. In this way, the frame structure for fixing the battery cells in the battery module can be omitted, thereby saving the internal space of the battery, improving the space utilization rate and energy density of the battery, simplifying the assembly process of the battery cells, and reducing costs.

In some embodiments, there are multiple first tabs, and the multiple first tabs are stacked. The battery cell further includes a limiting member, which is disposed on one side of the main body along the second direction and connected to the supporting member. Along the stacking direction of the multiple first tabs, the limiting member is at least partially located on one side of the multiple first tabs along the stacking direction, so as to constrain the multiple first tabs.

In the above solution, the limiting member can bind multiple first tabs, avoiding the first tabs from being scattered during the assembly process and use of the battery cell, reducing the risk of the root of the first tab being inserted into the main body, and avoiding short circuit , improve security.

In some embodiments, the limiting member surrounds the outer sides of the plurality of first tabs.

In the above solution, the limiting member constrains the multiple first tabs from both sides, so as to play the role of gathering the multiple first tabs.

In some embodiments, the support member further includes a protrusion protruding from the first side plate, and the limiting member is fixed to the protrusion.

The above solution facilitates the fixed connection between the stopper and the support member by providing the convex portion.

In some embodiments, the support member further includes a second side plate, the second side plate is disposed on one side of the main body along the second direction and connects the two first side plates and the support plate. The second side plate is provided with a channel through which the first tab passes.

In the above solution, the second side plate can limit the electrode assembly in the second direction, so as to reduce the deformation of the electrode assembly and the misalignment between the first pole piece and the second pole piece when the battery cell vibrates, and reduce the electrode assembly in the second direction. The shaking range in the second direction improves the performance and safety of the electrode assembly.

In some embodiments, the second side plate includes two side plate portions arranged at intervals along the first direction, the two side plate portions are respectively connected to the two first side plates, and a channel is formed between the two side plate portions.

In some embodiments, the inner surface of the housing includes two first surfaces oppositely arranged along a first direction and two second surfaces oppositely arranged along a third direction, and the first surface and the second surface pass through the first arc surface connected, the first direction is perpendicular to the third direction. The first side plate separates the first arc surface from the first pole piece of the electrode assembly, so that the distance between the first pole piece and the first arc surface in the first direction is greater than a predetermined value.

When the battery cell vibrates, if the first arcuate surface presses the first pole piece, the active material of the first pole piece may fall off, causing a safety risk. The above scheme increases the distance between the first pole piece and the first arcuate surface by setting the first side plate, reduces the risk of the first arcuate surface squeezing the first pole piece when the battery cell vibrates, and reduces the impact of the active material. Shedding for added security.

In some embodiments, the support member includes two third surfaces opposite to each other along the first direction, the two ends of each third surface along the third direction are connected with a second arcuate surface, the third surface faces the first surface, and the third surface faces the first surface. The second arc surface faces the first arc surface. The third surface is the surface of the first side plate away from the electrode assembly.

In the above solution, by setting the second arc surface on the support member, the interference between the support member and the first arc surface is avoided, and the support member can be smoothly installed into the housing.

In some embodiments, the radius of the second arc surface is smaller than or equal to the radius of the first arc surface.

In the above solution, the part of the supporting member forming the second arc surface can extend into the space corresponding to the first arc surface, so as to make full use of the inner space of the casing and improve the utilization rate of the inner space of the battery cell.

In some embodiments, the bottom surface of the recess is flat.

The electrode assembly expands during charging, and the expanded electrode assembly presses against the bottom surface of the recess. In the above solution, the flat bottom surface can make the electrode assembly receive a uniform force, reduce stress concentration, reduce the risk of the pole piece being crushed, and improve the performance of the electrode assembly.

In some embodiments, the support member is an integrally formed structure.

The above solution can improve the overall strength of the support member and simplify the molding process.

In some embodiments, the casing includes a casing and an end cap, the casing has an opening at the end, the electrode assembly and the supporting member are installed into the casing through the opening, and the end cap is used to cover the opening.

In a second aspect, an embodiment of the present application provides a battery, including a plurality of battery cells in any embodiment of the first aspect.

In a third aspect, an embodiment of the present application provides an electrical device, including the battery in the second aspect, and the battery is used to provide electrical energy.

In a fourth aspect, the embodiment of the present application provides a method for manufacturing a battery cell, including:

providing a support member having a recess;

providing an electrode assembly and housing at least part of the electrode assembly in the recess, wherein the support member is used to limit deformation of the electrode assembly;

Provide the enclosure;

Install the support member and electrode assembly into the case.

In some embodiments, the step of providing an electrode assembly and accommodating at least part of the electrode assembly in the recess includes: providing a first pole piece and a second pole piece; stacking the first pole piece and the second pole piece in the recess, to form an electrode assembly.

In a fifth aspect, the embodiment of the present application provides a battery cell manufacturing system, including a first providing device, a second providing device, a third providing device and an assembling device. The first providing device is used for providing a supporting member having a recess. The second providing means is used for providing the electrode assembly, and at least part of the electrode assembly is accommodated in the recess, wherein the supporting member is used for limiting deformation of the electrode assembly. The third providing means is used for providing the casing. Assembly means for mounting the support member and electrode assembly into the housing.

In some embodiments, the second providing device includes: a pole piece providing mechanism for providing the first pole piece and the second pole piece; a stacking mechanism for stacking the first pole piece and the second pole piece in the recess, so as to An electrode assembly is formed.

In the above solution, the stacking mechanism directly stacks the first pole piece and the second pole piece in the recess to form the electrode assembly, so that the supporting member can effectively support the electrodes during the subsequent transportation, assembly, and use of the electrode assembly. Components to limit the deformation of the electrode components, thereby ensuring the performance and safety of the electrode components.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments of the present application. Obviously, the accompanying drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on the accompanying drawings on the premise of not paying creative efforts.

Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application;

Fig. 2 is a schematic explosion diagram of a battery provided by some embodiments of the present application;

Fig. 3 is a schematic explosion diagram of a battery cell provided by some embodiments of the present application;

Fig. 4 is a schematic cross-sectional view of a battery cell provided by some embodiments of the present application;

FIG. 5 is an enlarged schematic diagram of the battery cell shown in FIG. 4 at box A;

Fig. 6 is a schematic diagram of the three-dimensional structure of the supporting member shown in Fig. 3;

Figure 7 is an enlarged schematic view of the support member shown in Figure 6 at the circle B;

Fig. 8 is a schematic side view of a battery cell provided by some embodiments of the present application, where the casing is omitted;

FIG. 9 is an enlarged schematic view of the battery cell shown in FIG. 8 at block C;

Fig. 10 is a schematic cross-sectional view of an electrode assembly of a battery cell provided in some embodiments of the present application;

Fig. 11 is a schematic cross-sectional view of an electrode assembly of a battery cell provided by another embodiment of the present application;

Fig. 12 is a schematic flowchart of a method for manufacturing a battery cell provided in some embodiments of the present application;

Fig. 13 is a schematic block diagram of a battery cell manufacturing system provided by some embodiments of the present application;

FIG. 14 is a schematic structural diagram of the second providing device shown in FIG. 13 .

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

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are the Claim some of the examples, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the technical field of this application; the terms used in this application in the description of the application are only to describe specific implementations The purpose of the example is not intended to limit the present application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and the description of the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the description and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific sequence or primary-subordinate relationship.

Reference in this application 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 present application. The occurrences of this 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.

In the description of this application, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection", "connection" and "attachment" should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

The term "and/or" in this application is only an association relationship describing associated objects, which means that there may be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and A and B exist alone. There are three cases of B. In addition, the character "/" in this application generally indicates that the contextual objects are an "or" relationship.

In the embodiments of the present application, "parallel" not only includes the situation of being absolutely parallel, but also includes the situation of roughly parallel in engineering conventional recognition; at the same time, "perpendicular" also includes not only the situation of being absolutely perpendicular, but also the situation of conventional engineering. Cognitive roughly vertical situations.

In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are for illustrative purposes only, and should not constitute any limitation to the application .

"Plurality" in this application refers to two or more (including two).

In this application, the battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc. The embodiment of the present application does not limit this.

The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may be a battery module or a battery pack. Batteries generally include a case for enclosing one or more battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.

The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive pole piece, a negative pole piece and a separator. A battery cell works primarily by moving metal ions between the positive and negative pole pieces. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode current collector and a positive electrode tab, and the positive electrode current collector is coated with a positive electrode active material layer , the positive electrode tab is not coated with the positive electrode active material layer. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, the positive electrode active material layer includes the positive electrode active material, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collector and a negative electrode tab, and the negative electrode current collector is coated with a negative electrode active material layer , the negative electrode tab is not coated with the negative electrode active material layer. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes the negative electrode active material, and the negative electrode active material may be carbon or silicon. The material of the spacer can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene).

When a battery cell is being charged, metal ions are deintercalated from the positive pole piece and intercalated into the negative pole piece, but some abnormalities may occur. For example, metal ions may precipitate on the surface of the negative electrode sheet and form metal elements, which will degrade the performance of the battery cell, greatly shorten the cycle life, and limit the fast charging capacity of the battery cell.

Taking a lithium-ion battery cell as an example, lithium ions are deintercalated from the positive pole piece and inserted into the negative pole piece during charging, but some abnormal conditions may occur, for example, the negative pole piece has insufficient lithium intercalation space, and lithium ions are inserted into the negative pole piece. If the resistance is too large or the lithium ions are deintercalated from the positive pole piece too quickly, the deintercalated lithium ions cannot be embedded in the negative active material layer of the negative pole piece in the same amount, and the lithium ions that cannot be embedded in the negative pole piece can only be on the surface of the negative pole piece. Gain electrons, thereby forming a silver-white metallic lithium element, which is the phenomenon of lithium precipitation. Lithium analysis not only reduces the performance of lithium-ion battery cells, greatly shortens the cycle life, but also limits the fast charging capacity of lithium-ion battery cells. In addition, when a lithium-ion battery cell undergoes lithium precipitation, the precipitated lithium metal is very active and can react with the electrolyte at a relatively low temperature, resulting in a decrease in the starting temperature (Tonset) of the battery's self-heating and The rate of self-generated heat increases, seriously endangering the safety of the battery cell. Furthermore, when the lithium precipitation is serious, the deintercalated lithium ions can form lithium crystals on the surface of the negative electrode sheet, and the lithium crystals are easy to pierce the separator, causing the risk of short circuit between the adjacent positive electrode sheet and negative electrode sheet.

The inventor found in the research that when the battery cell is shaken or squeezed, the battery assembly will shake and deform, which will cause the dislocation of the positive pole piece and the negative pole piece, resulting in the inability of some metal ions released from the positive pole piece to be inserted into the negative pole. sheet, thus causing the risk of metal ion precipitation, resulting in a decrease in the performance of the battery cell and causing a safety risk.

In view of this, the embodiment of the present application provides a technical solution, by providing a support member with a concave portion inside the battery cell to accommodate the electrode assembly and limit the deformation of the electrode assembly, so that the battery cell is shaken or squeezed At the same time, the dislocation of the positive pole piece and the negative pole piece is reduced, the risk of metal ion precipitation is reduced, the performance of the battery unit is improved, and the safety of the battery unit is improved.

The technical solutions described in the embodiments of the present application are applicable to batteries and electric devices using batteries.

Electric devices can be vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys and electric tools, and so on. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles; spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.; electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric boat toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and more. The embodiments of the present application do not impose special limitations on the above-mentioned electrical devices.

In the following embodiments, for the convenience of description, the electric device is taken as an example for description.

Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.

As shown in FIG. 1 , a battery 2 is arranged inside the vehicle 1 , and the battery 2 can be arranged at the bottom, head or tail of the vehicle 1 . The battery 2 can be used for power supply of the vehicle 1 , for example, the battery 2 can be used as an operating power source of the vehicle 1 .

The vehicle 1 may also include a controller 3 and a motor 4 , the controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

In some embodiments of the present application, the battery 2 can not only be used as an operating power source for the vehicle 1 , but can also be used as a driving power source for the vehicle 1 to provide driving power for the vehicle 1 instead of or partially replacing fuel oil or natural gas.

Fig. 2 is a schematic explosion diagram of a battery provided by some embodiments of the present application.

As shown in FIG. 2 , the battery 2 includes a case body 5 and a battery cell 6 , and the battery cell 6 is accommodated in the case body 5 .

The box body 5 is used to accommodate the battery cells 6, and the box body 5 may have various structures. In some embodiments, the box body 5 may include a first box body part 5a and a second box body part 5b, the first box body part 5a and the second box body part 5b cover each other, the first box body part 5a and the second box body part 5a The two box parts 5b jointly define a receiving space 5c for receiving the battery cells 6 . The second box body part 5b can be a hollow structure with one end open, the first box body part 5a is a plate-shaped structure, and the first box body part 5a covers the opening side of the second box body part 5b to form an accommodating space 5c The box body 5; the first box body portion 5a and the second box body portion 5b also can be a hollow structure with one side opening, and the opening side of the first box body portion 5a is covered on the opening side of the second box body portion 5b , to form a box body 5 with an accommodating space 5c. Certainly, the first box body part 5a and the second box body part 5b can be in various shapes, such as a cylinder, a cuboid, and the like.

In order to improve the airtightness after the connection of the first box body part 5a and the second box body part 5b, a sealant, such as sealant, sealing ring, etc., can also be arranged between the first box body part 5a and the second box body part 5b. .

Assuming that the first box part 5a covers the top of the second box part 5b, the first box part 5a can also be called an upper box cover, and the second box part 5b can also be called a lower box.

In the battery 2, there may be one battery cell 6, or there may be a plurality of them. If there are multiple battery cells 6 , the multiple battery cells 6 can be connected in series, in parallel or in parallel. The mixed connection means that the multiple battery cells 6 are both in series and in parallel.

A plurality of battery cells 6 can be directly connected in series or in parallel or mixed together, and then the whole composed of a plurality of battery cells 6 is housed in the box body 5; of course, a plurality of battery cells 6 can also be connected in series first Or parallel or mixed connection to form a battery module, multiple battery modules are then connected in series or parallel or mixed to form a whole, and accommodated in the box 5 .

In some embodiments, the battery unit 6 is directly mounted on the case 5 as a whole. This can save the process of combining multiple battery cells 6 into a battery module, and save the fixing frame for fixing the battery cells 6 in the battery module, which can simplify the structure of the battery and increase the energy density of the battery.

Fig. 3 is a schematic exploded view of a battery cell provided by some embodiments of the present application; Fig. 4 is a schematic cross-sectional view of a battery cell provided by some embodiments of the present application; Fig. 5 is a schematic diagram of the battery cell shown in Fig. Figure 6 is a schematic perspective view of the three-dimensional structure of the support member shown in Figure 3; Figure 7 is an enlarged schematic view of the support member shown in Figure 6 at the circle B.

As shown in FIGS. 3 to 7 , the battery cell 6 of the embodiment of the present application includes an electrode assembly 10 , a casing 20 and a supporting member 30 . The electrode assembly 10 is accommodated in a case 20 . The support member 30 is accommodated in the housing 20 and has a recess 31 for receiving at least part of the electrode assembly 10 to limit deformation of the electrode assembly 10 .

The casing 20 is a hollow structure, and an accommodating cavity for accommodating the electrode assembly 10 and electrolyte is formed inside. The housing 20 can be in various shapes, such as cylinder, cuboid and so on. The shape of the casing 20 may be determined according to the specific shape of the electrode assembly 10 . For example, if the electrode assembly 10 has a cylindrical structure, a cylindrical shell can be selected; if the electrode assembly 10 has a rectangular parallelepiped structure, a rectangular parallelepiped shell can be selected.

The electrode assembly 10 is the core component for the battery cell 6 to realize the charging and discharging function, and it includes a first pole piece, a second pole piece and a spacer, the polarity of the first pole piece and the second pole piece are opposite, and the spacer is used to The first pole piece is insulated from the second pole piece. The electrode assembly 10 mainly relies on metal ions to move between the first pole piece and the second pole piece to work.

One of the first pole piece and the second pole piece is a positive pole piece, and the other of the first pole piece and the second pole piece is a negative pole piece.

The electrode assembly 10 may be a wound structure, a stacked structure or other structures.

There may be one or more first pole pieces, and one or more second pole pieces. The number of the first pole piece and the second pole piece can be determined according to the structure of the electrode assembly 10 .

There can be one electrode assembly 10, or there can be multiple electrodes, which is not limited in this embodiment.

The electrode assembly 10 may be entirely accommodated in the concave portion 31 . Of course, only a part of the electrode assembly 10 can be accommodated in the recess 31, and the other part protrudes out of the recess 31.

The recess 31 has an opening opposite to the bottom surface of the recess 31 , and the electrode assembly 10 may be placed into the recess 31 through the opening of the recess 31 .

The supporting member 30 may be formed as a whole, or may be spliced from multiple parts by welding, bonding, clamping or other methods.

In the embodiment of the present application, the concave portion 31 of the support member 30 can accommodate at least part of the electrode assembly 10, and when the battery cell 6 is subjected to vibration or extrusion, the support member 30 can limit the deformation of the electrode assembly 10 and reduce the size of the electrode assembly 10. The dislocation of the positive pole piece and the negative pole piece reduces the risk of metal ion precipitation, improves the performance of the battery cell 6, and improves the safety of the battery cell 6.

In some embodiments, support member 30 is made of an insulating material. The supporting member 30 can insulate a part of the electrode assembly 10 from the casing 20 to reduce the risk of short circuit and improve safety.

In some embodiments, the casing 20 includes a housing 21 and an end cover 22, the end of the housing 21 has an opening 211, the electrode assembly 10 and the support member 30 are installed into the housing 21 through the opening 211, and the end cover 22 is used to cover Fit to the opening 211.

The casing 21 is a hollow structure, and a space for accommodating the electrode assembly 10 is formed inside it. The shape of the casing 21 may be determined according to the specific shape of the electrode assembly 10 . For example, if the electrode assembly 10 has a cylindrical structure, a cylindrical shell can be selected; if the electrode assembly 10 has a rectangular parallelepiped structure, a rectangular parallelepiped shell can be selected.

The housing 21 can be a structure with one side opening, and the end cover 22 is provided as one and covers the opening of the housing 21 . Alternatively, the housing 21 can also be a structure with openings on both sides, and there are two end caps 22 , and the two end caps 22 respectively cover the two openings of the housing 21 .

The end cover 22 can be connected to the housing 21 by welding, bonding, clamping or other methods.

In some embodiments, the battery cell 6 further includes two electrode terminals 40 mounted on the end cap 22, and the two electrode terminals 40 are respectively used to electrically connect the first pole piece and the second pole piece, so as to connect the electrode assembly 10 The electrical energy generated is exported.

In some embodiments, the housing 21 has a structure with openings on both sides, and there are two end caps 22 , and the two end caps 22 respectively cover the two openings of the housing 21 . The two electrode terminals 40 are installed on the two end caps 22 respectively.

In some embodiments, the support member 30 is also used to support the electrode assembly 10 during installation of the electrode assembly 10 into the case 20 .

The electrode assembly 10 is formed by winding or stacking the first pole piece, the second pole piece and the separator, which has low rigidity and is prone to deformation during transportation and assembly. After the electrode assembly 10 is deformed, it is easy to rub against the casing 21 during installation into the casing 21, causing the risk of the electrode assembly 10 being scratched; when the electrode assembly 10 is severely deformed, it may cause the electrode assembly 10 to be difficult to into the shell.

In this embodiment, the electrode assembly 10 can be put into the recess 31 of the support member 30 first, and then the electrode assembly 10 and the support member 30 can be put into the casing 21 together. The supporting member 30 can limit and shape the electrode assembly 10 to reduce the misalignment between the first pole piece and the second pole piece. The support member 30 may support the electrode assembly 10 during transportation and assembly of the electrode assembly 10 to reduce deformation of the electrode assembly 10 . During the process of inserting into the casing, the supporting member 30 can protect the electrode assembly 10, reduce the risk of the electrode assembly 10 being scratched by the casing 21, and improve safety.

In some embodiments, the bottom surface of the concave portion 31 is a plane.

The electrode assembly 10 will expand during charging, and the expanded electrode assembly 10 will press against the bottom surface of the concave portion 31 . The flat bottom surface can make the electrode assembly 10 be stressed evenly, reduce stress concentration, reduce the risk of the pole pieces being crushed, and improve the performance of the electrode assembly 10 .

In some embodiments, the support member 30 includes a support plate 32 and two first side plates 33 . The support plate 32 is against the electrode assembly 10 . The two first side plates 33 are respectively connected to both ends of the support plate 32 along the first direction X, the two first side plates 33 and the support plate 32 are used to enclose the recess 31, and the first side plates 33 are used to limit the electrode assembly 10 Movement in the first direction X.

In this embodiment, the two first side plates 33 can restrict the electrode assembly 10 from both sides, so as to reduce the deformation of the electrode assembly 10 and the gap between the first pole piece and the second pole piece when the battery cell 6 vibrates. Misalignment improves the performance and safety of the electrode assembly 10 .

The support plate 32 can support the electrode assembly 10 during the process of installing the electrode assembly 10 into the casing 20, and the two first side plates 33 can protect the electrode assembly 10 from both sides, reducing the possibility of the electrode assembly 10 being scratched by the casing 21. risk.

In some embodiments, the support plate 32 is a flat plate structure, and the surface of the support plate 32 facing the electrode assembly 10 is the bottom surface of the recess 31 .

In some embodiments, the support plate 32 is provided with a first through hole 321 , and the first through hole 321 is used for communicating the recess 31 with the space on the side of the support plate 32 away from the electrode assembly 10 .

The first through hole 321 passes through the support plate 32 along the thickness direction of the support plate 32 .

There can be one or more first through holes 321 . The first through hole 321 may be a circular hole, a square hole, a racetrack hole or a hole of other shapes.

In this embodiment, the electrolyte in the casing 20 can pass through the first through hole 321 and soak into the electrode assembly 10 , thereby improving the performance of the electrode assembly 10 . The first through hole 321 can also reduce the weight of the support member 30 and reserve more space for the electrolyte, so that the casing 20 can accommodate more electrolyte.

In some embodiments, there are multiple first through holes 321 .

In this embodiment, the plurality of first through holes 321 can allow the electrolyte to infiltrate multiple regions of the electrode assembly 10 , which can improve the consistency of performance of the electrode assembly 10 .

In some embodiments, the support plate 32 includes a plurality of first bar-shaped portions 322 extending along a first direction X and a plurality of second bar-shaped portions 323 extending along a second direction Y, and the second direction Y is perpendicular to the first Direction X. The plurality of first bar-shaped portions 322 and the plurality of second bar-shaped portions 323 are intersected to form a plurality of first through holes 321 .

In this embodiment, the rigidity of the support plate 32 is ensured under the premise of forming the first through hole 321 by intersecting a plurality of first bar-shaped parts 322 and a plurality of second bar-shaped parts 323, so as to effectively support Electrode assembly 10.

In some embodiments, the support plate 32 may further include a reinforcing rib (not shown) accommodated in the first through hole 321 , and the reinforcing rib connects the first strip portion 322 and the second strip portion 323 .

In some embodiments, the first side plate 33 is provided with a second through hole 331 , and the second through hole 331 is used to communicate the recess 31 with the space on the side of the first side plate 33 away from the electrode assembly 10 .

The second through hole 331 passes through the support plate 32 along the thickness direction of the first side plate 33 .

There can be one or more second through holes 331 . The second through hole 331 may be a circular hole, a square hole, a racetrack hole or a hole of other shapes.

In this embodiment, the electrolyte in the casing 20 can pass through the second through hole 331 and infiltrate the electrode assembly 10 , thereby improving the performance of the electrode assembly 10 . The second through hole 331 can also reduce the weight of the supporting member 30 and reserve more space for the electrolyte, so that the casing 20 can accommodate more electrolyte.

In some embodiments, the thickness of the support plate 32 is greater than the thickness of the first side plate 33 .

In this embodiment, the support plate 32 has a relatively large thickness and strength, so the support plate 32 can support the electrode assembly 10 during the process of installing the electrode assembly 10 into the casing 20, and reduce the impact of the support plate 32 on the electrode assembly 10. Deformation under gravity; since the first side plate 33 is used to limit the movement of the electrode assembly 10 in the first direction X without supporting the electrode assembly 10, the first side plate 33 can have a smaller thickness to reduce the supporting member The volume and weight of 30 increase the energy density of the battery cell 6 .

In some embodiments, the included angle between the support plate 32 and the first side plate 33 is 80°-100°.

The angle between the support plate 32 and the first side plate 33 may be the angle between the surface of the support plate 32 facing the electrode assembly 10 and the surface of the first side plate 33 facing the electrode assembly 10 .

In some embodiments, the electrode assembly 10 includes a main body 11 and a first tab 12 drawn from the end of the main body 11 along the second direction Y, at least part of the main body 11 is accommodated in the recess 31, and the first tab 12 At least part of protrudes from the recess 31, and the first direction X is perpendicular to the second direction Y.

The first pole piece includes a first current collector and a first active material layer, and the first active material layer is coated on the surface of the first current collector; the first current collector includes a first current collector and a first tab 12, the first The current collecting part is coated with the first active material layer, and the first tab 12 is not coated with the first active material layer. The main body portion 11 includes a first current collecting portion and a first active material layer.

In this embodiment, at least part of the first tab 12 protrudes from the recess 31 to prevent the support member 30 from interfering with the connection between the first tab 12 and other conductive structures (such as the electrode terminal 40 ). The supporting member 30 can reduce the shaking amplitude of the main body part 11 when the battery cell 6 vibrates, and reduce the risk of tearing the first tab 12 .

In some embodiments, the second pole piece includes a second current collector and a second active material layer, and the second active material layer is coated on the surface of the second current collector; the second current collector includes a second current collector and a second current collector. The tab, the second current collecting portion is coated with the second active material layer, and the second tab is not coated with the second active material layer.

The main body part 11 also includes a second current collecting part, a second active material layer, and a separator.

The first tab 12 and the second tab (not shown) can be drawn out from the same end of the main body 11 along the second direction Y, or can be drawn out from both ends of the main body 11 along the second direction Y respectively.

In some embodiments, the size of the main body portion 11 along the second direction Y is 150mm-2000mm.

Exemplarily, the size of the main body portion 11 along the second direction Y is 150 mm, 400 mm, 600 mm, 1000 mm, 1200 mm, 1500 mm or 2000 mm.

Exemplarily, the second direction Y is parallel to the length direction of the battery cell 6 .

In this embodiment, the size of the battery cells 6 along the second direction Y is long enough to match the size of the box, and multiple battery cells 6 can be directly arranged side by side in the box, without first installing the battery cells. 6 assembled into a battery module, so that the frame structure for fixing the battery cell 6 in the battery module can be omitted, thereby saving the internal space of the battery, improving the space utilization rate and energy density of the battery, and simplifying the installation of the battery cell 6 Assembly process, reduce cost.

Since the electrode assembly 10 has a larger size along the second direction Y, the electrode assembly 10 is more easily deformed during production, transportation and assembly. In this embodiment, the electrode assembly 10 is supported by setting the supporting member 30 to reduce the deformation of the electrode assembly 10 and the misalignment between the first pole piece and the second pole piece.

In some embodiments, the inner surface of the housing 20 includes two first surfaces 21a oppositely arranged along the first direction X and two second surfaces 21b oppositely arranged along the third direction Z, the first surface 21a and the second surface 21b are connected by a first arc surface 21c, and the first direction X is perpendicular to the third direction Z. The first side plate 33 separates the first arc surface 21 c from the first pole piece of the electrode assembly 10 , so that the distance between the first pole piece and the first arc surface 21 c in the first direction X is greater than a predetermined value.

Exemplarily, the first surface 21a and the second surface 21b are both plane and perpendicular to each other. The first arc surface 21c is tangent to the first surface 21a and tangent to the second surface 21b.

Exemplarily, the second direction Y is perpendicular to the third direction Z.

Exemplarily, during the molding process of the housing 20 , in order to remove sharp corners and reduce stress concentration, rounded corners may be provided at the corners of the housing 20 . The first arc surface 21c is a surface formed after opening a rounded corner.

When the battery cell 6 vibrates, if the first arc surface 21c presses the first pole piece, the first active material layer of the first pole piece may fall off, causing a safety risk. In this embodiment, the first side plate 33 is provided to increase the distance between the first pole piece and the first arcuate surface 21c, and reduce the risk that the first arcuate surface 21c will squeeze the first pole piece when the battery cell 6 vibrates. Reduce the shedding of the first active material layer and improve safety.

In some embodiments, the size of the battery cell 6 along the second direction Y is larger than the size of the battery cell 6 along the first direction X, and the size of the battery cell 6 along the first direction X is larger than the size of the battery cell 6 along the third direction. Z-dimensions.

The space reserved by the vehicle in the vertical direction for the battery is limited, in order to reduce the height of the battery in the vertical direction, the first direction X can be made parallel to the vertical direction. Of course, it is also possible to make the third direction Z parallel to the vertical direction.

In some embodiments, the first direction X is parallel to the vertical direction. At this time, a first side plate 33 is located on the lower side of the electrode assembly 10 along the vertical direction, and the first side plate 33 can support the electrode assembly 10, and reduce the pressure of the first pole piece on the first arc surface 21c under the action of gravity. The risk of reducing the shedding of active substances.

In some embodiments, the support member 30 includes two third surfaces 30a oppositely arranged along the first direction X, and the two ends of each third surface 30a along the third direction Z are connected with a second arc surface 30b, and the third surface 30a faces the first surface 21a, and the second arc surface 30b faces the first arc surface 21c. The third surface 30 a is a surface of the first side plate 33 facing away from the electrode assembly 10 .

In this embodiment, the support member 30 is provided with the second arc surface 30b to avoid interference between the support member 30 and the first arc surface 21c, thereby ensuring that the support member 30 can be smoothly installed into the housing 20 .

In some embodiments, the radius of the second arc surface 30b is smaller than or equal to the radius of the first arc surface 21c.

In this embodiment, the part of the support member 30 forming the second arc surface 30b can extend into the space corresponding to the first arc surface 21c, so as to make full use of the internal space of the casing 20 and improve the interior of the battery cell 6. Space utilization.

In some embodiments, the support member 30 is a monolithic structure. This embodiment can improve the overall strength of the supporting member 30 and simplify the molding process.

Exemplarily, the support plate 32 and the first side plate 33 are integrally formed.

In some embodiments, the size of the housing cavity 20 along the first direction X is larger than the size of the support member 30 along the first direction X, and the size of the housing cavity 20 along the third direction Z is larger than that of the support member 30 along the third direction. Z, so that the support member 30 is installed in the housing 20.

In some embodiments, the support member 30 is made of electrolyte-resistant material, such as polypropylene, polyethylene terephthalate, or other polymer materials.

Fig. 8 is a schematic side view of a battery cell provided by some embodiments of the present application, wherein the housing is omitted; Fig. 9 is an enlarged schematic view of the cell shown in Fig. 8 at block C.

Please refer to FIG. 6 to FIG. 9 together. In some embodiments, there are multiple first tabs 12 , and the multiple first tabs 12 are stacked. The battery cell 6 further includes a limiting member 50 disposed on one side of the main body 11 along the second direction Y and connected to the supporting member 30 . Along the stacking direction of the multiple first tabs 12 , the limiting member 50 is at least partially located on one side of the multiple first tabs 12 along the stacking direction, so as to constrain the multiple first tabs 12 .

The plurality of first tabs 12 can improve the overcurrent capability and prevent the first tabs 12 from being blown.

The limiting member 50 can bind the multiple first tabs 12 from one side, and can also bind the multiple first tabs 12 from both sides.

In this embodiment, the limiting member 50 can constrain a plurality of first tabs 12 to prevent the first tabs 12 from spreading out during the assembly process and use of the battery cell 6 and reduce the insertion of the root of the first tab 12 . The main body part 11 avoids the risk of short circuit and improves safety.

In some embodiments, the limiting member 50 surrounds the outer sides of the plurality of first tabs 12 .

The limiting member 50 may be an integrally formed structure. For example, the limiting member 50 can be an annular structure, such as a rubber ring, sheathed on the outside of the plurality of first tabs 12 .

Certainly, the limiting member 50 may also be a split structure. For example, the limiting member 50 includes two clamping strips, and the two clamping strips are respectively located on both sides of the plurality of first tabs 12 along the stacking direction; the ends of the two clamping strips are snapped together to form a ring-shaped limiting member 50.

In this embodiment, the limiting member 50 constrains the plurality of first tabs 12 from both sides, so as to play the role of gathering the plurality of first tabs 12 .

In some embodiments, the support member 30 further includes a protrusion 34 protruding from the first side plate 33 , and the limiting member 50 is fixed to the protrusion 34 .

The protrusion 34 protrudes from the end surface of the first side plate 33 along the second direction Y. As shown in FIG. The protrusion 34 may be directly connected to the first side plate 33 , or may be indirectly connected to the first side plate 33 through other parts of the supporting member 30 .

The limiting member 50 can be fixed on the protrusion 34 by clipping, welding, bonding or other methods.

In this embodiment, by providing the convex portion 34 , it is convenient to realize the fixed connection between the limiting member 50 and the supporting member 30 .

In some embodiments, the ends of the two first side plates 33 are provided with protrusions 34 . The protrusions 34 on the two first side plates 33 fix and support the limiting member 50 from both ends.

In some embodiments, in the second direction Y, the protruding portion 34 protrudes from the first side plate 33 by less than or equal to 5 mm.

In some embodiments, the supporting member 30 further includes a second side plate 35 disposed on one side of the main body 11 along the second direction Y and connecting the two first side plates 33 and the supporting plate 32 . The second side plate 35 defines a channel 351 through which the first tab 12 passes.

In this embodiment, the second side plate 35 can limit the electrode assembly 10 in the second direction Y, so as to reduce the deformation of the electrode assembly 10 and the gap between the first pole piece and the second pole piece when the battery cell 6 vibrates. The displacement of the electrode assembly 10 in the second direction Y is reduced, and the performance and safety of the electrode assembly 10 are improved.

In some embodiments, the second side plate 35 is a flat plate and is perpendicular to the first side plate 33 and the supporting plate 32 .

In some embodiments, the support member 30 further includes a third side plate 36 . The third side plate 36 is disposed on a side of the main body away from the second side plate 35 and connects the two first side plates 33 and the support plate 32 . The third side plate 36 is provided with a channel through which the second tab passes.

In some embodiments, the first side plate 33 , the second side plate 35 , the third side plate 36 , the support plate 32 and the protrusion 34 are integrally formed.

In some embodiments, the second side plate 35 includes two side plate portions 352 arranged at intervals along the first direction X, the two side plate portions 352 are connected to the two first side plates 33 respectively, and the two side plate portions 352 forms a channel 351 .

In some embodiments, the convex part 34 may be formed on the side plate part 352 .

FIG. 10 is a schematic cross-sectional view of an electrode assembly of a battery cell provided by some embodiments of the present application.

As shown in FIG. 10 , the electrode assembly 10 includes a plurality of first pole pieces 13 and a plurality of second pole pieces 14, and a plurality of first pole pieces 13 and a plurality of second pole pieces 14 alternate along a direction perpendicular to the bottom surface of the concave portion. cascading.

Exemplarily, the first pole piece 13 and the second pole piece 14 are flat plate structures, and the stacking direction of the first pole piece 13 and the second pole piece 14 is parallel to the thickness direction of the first pole piece 13 and the thickness direction of the second pole piece 13. 14 in the thickness direction.

The electrode assembly 10 is a laminated structure with low rigidity, and the binding force between the first pole piece 13 and the second pole piece 14 is weak, so the electrode assembly 10 is easier to deform during production and assembly. The supporting member in this embodiment can effectively support the electrode assembly 10 and limit the deformation of the electrode assembly 10 , thereby ensuring the use performance and safety performance of the electrode assembly 10 .

In some embodiments, the electrode assembly 10 further includes a separator 15 for insulating and isolating the first pole piece 13 and the second pole piece 14 .

In some embodiments, the electrode assembly 10 is formed by stacking the first pole piece 13 and the second pole piece 14 within the recess.

When preparing the electrode assembly 10, the equipment directly stacks the first pole piece 13 and the second pole piece 14 in the concave portion of the supporting member. In this way, during the production process of the electrode assembly 10 and the subsequent transportation, assembly, and use processes, the supporting member can effectively support the electrode assembly 10 and limit the deformation of the electrode assembly 10, thereby ensuring the use performance and safety performance of the electrode assembly 10.

In some embodiments, when preparing the electrode assembly 10 , the equipment directly stacks the first pole piece 13 , the second pole piece 14 and the separator 15 in the concave portion of the supporting member.

FIG. 11 is a schematic cross-sectional view of an electrode assembly of a battery cell provided by other embodiments of the present application.

As shown in FIG. 11 , in some embodiments, the electrode assembly 10 includes a first pole piece 13 and a plurality of second pole pieces 14, and the first pole piece 13 is continuously bent and includes a plurality of laminated segments 131 and a plurality of bent The segments 132 , the multiple stacked segments 131 and the multiple second pole pieces 14 are alternately stacked along a direction perpendicular to the bottom surface of the recess, and each bent segment 132 is used to connect two adjacent stacked segments 131 .

Exemplarily, both the lamination section 131 and the second pole piece 14 are planar structures, and the lamination direction of the lamination section 131 and the second pole piece 14 is parallel to the thickness direction of the lamination section 131 and the thickness direction of the second pole piece 14 .

The supporting member in this embodiment can effectively support the electrode assembly 10 and limit the deformation of the electrode assembly 10 , thereby ensuring the usability and safety performance of the electrode assembly 10 .

FIG. 12 is a schematic flowchart of a method for manufacturing a battery cell provided by some embodiments of the present application.

As shown in Figure 12, the manufacturing method of the battery cell provided in the embodiment of the present application includes:

S100. Provide a support member, where the support member has a concave portion;

S200. Provide an electrode assembly, and accommodate at least part of the electrode assembly in the recess, wherein the support member is used to limit deformation of the electrode assembly;

S300, provide shell:

S400. Install the supporting member and the electrode assembly into the casing.

In some embodiments, step S200 includes:

S210, providing a first pole piece and a second pole piece;

S220, stacking the first pole piece and the second pole piece in the recess to form an electrode assembly.

In this embodiment, the first pole piece and the second pole piece are directly stacked in the recess to form an electrode assembly, so that in the subsequent transportation, assembly, and use of the electrode assembly, the supporting member can effectively support the electrode assembly and limit the electrode assembly. The deformation of the components, so as to ensure the performance and safety of the electrode components.

It should be noted that, for the relevant structures of the battery cells manufactured by the above battery cell manufacturing method, reference may be made to the battery cells provided in the foregoing embodiments.

When manufacturing a battery cell based on the above-mentioned method for manufacturing a battery cell, it is not necessary to follow the above steps in sequence, that is, the steps may be performed in the order mentioned in the embodiment, or may be different from the order mentioned in the embodiment Steps are executed, or several steps are executed simultaneously. For example, the steps S100 and S300 are not executed sequentially, and may also be executed simultaneously.

FIG. 13 is a schematic block diagram of a battery cell manufacturing system provided by some embodiments of the present application; FIG. 14 is a schematic structural diagram of the second providing device shown in FIG. 13 .

As shown in FIG. 13 and FIG. 14 , the battery cell manufacturing system 90 of the embodiment of the present application includes a first providing device 91 , a second providing device 92 , a third providing device 93 and an assembling device 94 . The first providing device 91 is used to provide a support member having a recess. The second providing device 92 is used for providing the electrode assembly, and at least part of the electrode assembly is accommodated in the recess, wherein the supporting member is used to limit the deformation of the electrode assembly. The third providing means 93 is used to provide the housing. Assembly device 94 is used to install the support member and electrode assembly into the housing.

In some embodiments, the second providing device 92 includes: a pole piece providing mechanism 921 for providing the first pole piece and the second pole piece; a stacking mechanism 922 for stacking the first pole piece and the second pole piece in the recess sheet to form an electrode assembly.

The stacking mechanism 922 of this embodiment directly stacks the first pole piece and the second pole piece in the recess of the support member 30 to form an electrode assembly, so that the support member can be used during the subsequent transportation, assembly, and use of the electrode assembly. Effectively support the electrode assembly and limit the deformation of the electrode assembly, thereby ensuring the use performance and safety performance of the electrode assembly.

For the relevant structure of the battery cells manufactured by the above manufacturing system, reference may be made to the battery cells provided in the above embodiments.

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

A battery cell, comprising:

shell;

an electrode assembly housed within the housing; and

A supporting member is accommodated in the housing and has a recess for receiving at least part of the electrode assembly to limit deformation of the electrode assembly.
The battery cell according to claim 1, wherein the electrode assembly comprises a plurality of first pole pieces and a plurality of second pole pieces, and a plurality of the first pole pieces and a plurality of the second pole pieces are arranged along the alternately stacked in a direction perpendicular to the bottom surface of the recess; or,

The electrode assembly includes a first pole piece and a plurality of second pole pieces, the first pole piece is bent continuously and includes a plurality of laminated segments and a plurality of bent segments, the plurality of laminated segments and the plurality of the The second pole pieces are alternately stacked along a direction perpendicular to the bottom surface of the recess, and each of the bent sections is used to connect two adjacent stacked sections.
The battery cell according to claim 2, wherein the electrode assembly is formed by stacking the first pole piece and the second pole piece within the recess.
The battery cell according to any one of claims 1-3, wherein the supporting member comprises:

a support plate against the electrode assembly; and

Two first side plates are respectively connected to both ends of the support plate along the first direction, the two first side plates and the support plate are used to enclose the recess, and the first side plate is used for for restricting the movement of the electrode assembly in the first direction.
The battery cell according to claim 4, wherein the support plate is provided with a first through hole, and the first through hole is used to connect the concave portion and the side of the support plate away from the electrode assembly. spatial connectivity.
The battery cell according to claim 5, wherein a plurality of the first through holes are provided.
The battery cell according to claim 6, wherein the support plate comprises a plurality of first bar-shaped portions extending along the first direction and a plurality of second bar-shaped portions extending along the second direction, the the second direction is perpendicular to the first direction;

A plurality of the first bar-shaped parts and a plurality of the second bar-shaped parts are intersected to form a plurality of the first through holes.
The battery cell according to any one of claims 4-7, wherein the first side plate is provided with a second through hole, and the second through hole is used to connect the concave portion and the The space on the side of the plate facing away from the electrode assembly communicates with the space.
The battery cell according to any one of claims 4-8, wherein the thickness of the support plate is greater than the thickness of the first side plate.
The battery cell according to any one of claims 4-9, wherein an included angle between the support plate and the first side plate is 80°-100°.
The battery cell according to any one of claims 4-10, wherein the electrode assembly comprises a main body and a first tab drawn from an end of the main body along the second direction, at least part of the main body Accommodated in the recess, at least part of the first tab protrudes from the recess, and the first direction is perpendicular to the second direction.
The battery cell according to claim 11, wherein a dimension of the main body along the second direction is 150mm-2000mm.
The battery cell according to claim 11 or 12, wherein there are multiple first tabs, and multiple first tabs are stacked;

The battery cell further includes a limiting member, the limiting member is disposed on one side of the main body along the second direction and connected to the supporting member;

Along the stacking direction of the multiple first tabs, the limiting member is at least partially located on one side of the multiple first tabs along the stacking direction, so as to constrain the multiple first tabs.
The battery cell according to claim 13, wherein the limiting member surrounds the outer sides of the plurality of first tabs.
The battery cell according to claim 13 or 14, wherein the supporting member further includes a protrusion protruding from the first side plate, and the limiting member is fixed to the protrusion.
The battery cell according to any one of claims 11-15, wherein the supporting member further comprises a second side plate, the second side plate is disposed on one side of the main body along the second direction and connect the two first side plates and the support plate;

The second side plate is provided with a channel through which the first tab passes.
The battery cell according to claim 16, wherein the second side plate includes two side plate parts spaced apart along the first direction, and the two side plate parts are respectively connected to the two second side plate parts. a side plate, and the channel is formed between the two side plate parts.
The battery cell according to claims 4-17, wherein the inner surface of the housing includes two first surfaces facing each other along the first direction and two second surfaces facing each other along a third direction, The first surface and the second surface are connected by a first arc surface, and the first direction is perpendicular to the third direction;

The first side plate separates the first arc surface from the first pole piece of the electrode assembly, so that the first pole piece and the first arc surface are aligned in the first direction The spacing is greater than the predetermined value.
The battery cell according to claim 18, wherein the supporting member includes two third surfaces oppositely arranged along the first direction, and two ends of each third surface along the third direction are connected with a second arc surface, the third surface faces the first surface, and the second arc surface faces the first arc surface;

The third surface is a surface of the first side plate facing away from the electrode assembly.
The battery cell according to claim 19, wherein a radius of the second arc surface is smaller than or equal to a radius of the first arc surface.
The battery cell according to any one of claims 1-20, wherein the bottom surface of the concave portion is a plane.
The battery cell according to any one of claims 1-21, wherein the supporting member is an integral structure.
The battery cell according to any one of claims 1-22, wherein the casing comprises a case and an end cover, the end of the case has an opening through which the electrode assembly and the supporting member are installed Into the housing, the end cap is used to cover the opening.
A battery comprising a plurality of battery cells according to any one of claims 1-23.
An electrical device comprising the battery according to claim 24, the battery being used for providing electrical energy.
A method for manufacturing a battery cell, comprising:

providing a support member having a recess;

providing an electrode assembly and housing at least part of the electrode assembly within the recess, wherein the support member is configured to limit deformation of the electrode assembly;

provide the casing;

The support member and the electrode assembly are installed into the case.
The manufacturing method according to claim 26, wherein the step of providing an electrode assembly and accommodating at least part of the electrode assembly in the recess comprises:

providing a first pole piece and a second pole piece;

The first pole piece and the second pole piece are stacked in the recess to form an electrode assembly.
A manufacturing system for a battery cell, comprising:

a first providing means for providing a support member having a recess;

The second providing device is used to provide an electrode assembly, and accommodate at least part of the electrode assembly in the recess, wherein the support member is used to limit deformation of the electrode assembly;

a third providing device for providing the housing;

An assembly device for installing the support member and the electrode assembly into the housing.
The manufacturing system according to claim 28, wherein said second providing means comprises:

a pole piece providing mechanism for providing the first pole piece and the second pole piece;

The stacking mechanism is used for stacking the first pole piece and the second pole piece in the recess to form an electrode assembly.