Battery cell and manufacturing method and equipment thereof, battery and power-consuming device

Abstract

The present application relates to a battery cell and a manufacturing method and equipment thereof, a battery and an electrical device, and belongs to the field of battery manufacturing technology. The present application proposes a battery cell, comprising: a shell, the shell comprising a top wall, a side wall and a bottom wall, the top wall and the bottom wall are arranged opposite to each other, and the side wall connects the top wall and the bottom wall; a pressure relief member, arranged on the bottom wall, the pressure relief member is configured to be actuated to release the pressure inside the battery cell when the internal pressure or temperature of the battery cell reaches a threshold value; wherein the pressure relief member has a first surface facing the inside of the battery cell, and the first surface is configured to guide the electrolyte to the periphery of the pressure relief member. The battery cell has good safety performance and a long service life when used upside down. The present application also proposes a battery and an electrical device, including the battery cell. The present application also proposes a manufacturing method and equipment for a battery cell.

Description

Technical Field

[0001] The present application relates to the technical field of battery manufacturing, and in particular to a battery cell and a manufacturing method and equipment thereof, a battery, and an electrical device. Background Art

[0002] With the rapid rise of the new energy vehicle industry, the technical level of power batteries is also improving rapidly. How to improve the safety performance of power batteries is one of the main research and development trends of power battery technology.

[0003] At present, placing the power battery upside down can improve the safety performance of the power battery. However, based on the internal structure of the existing power battery, if the power battery is directly placed upside down for use, there will be certain safety hazards and the service life will also be affected. Summary of the invention

[0004] To this end, the present application proposes a battery cell and a manufacturing method and equipment thereof, a battery and an electrical device, which can have good safety performance and a long service life when used inverted.

[0005] The first aspect of the present application provides a battery cell, comprising: a shell, the shell comprising a top wall, a side wall and a bottom wall, the top wall and the bottom wall are arranged opposite to each other, and the side wall connects the top wall and the bottom wall; a pressure relief piece, arranged on the bottom wall, the pressure relief piece is configured to be actuated to release the pressure inside the battery cell when the internal pressure or temperature of the battery cell reaches a threshold value; wherein the pressure relief piece has a first surface facing the interior of the battery cell, and the first surface is configured to guide the electrolyte to the periphery of the pressure relief piece.

[0006] In the battery cell of the embodiment of the present application, the pressure relief member has a first surface facing the inside of the battery cell. When the battery cell is used upside down, the first surface of the pressure relief member can guide the electrolyte to diffuse around the pressure relief member and accumulate in other parts of the battery cell. Since the electrolyte does not accumulate on the first surface of the pressure relief member, it will not corrode the pressure relief member and cause the battery cell to leak prematurely, thereby improving the safety performance and effective service life of the battery cell.

[0007] According to some embodiments of the present application, the first surface is an inclined surface that is inclined relative to the thickness direction of the bottom wall.

[0008] With this arrangement, when the battery cell is used inverted, the thickness direction of the bottom wall extends along the direction of gravity, and one side edge of the first surface is higher than the other side edge, which can guide the electrolyte to flow from the high side edge to the low side edge of the first surface, thereby avoiding the accumulation of electrolyte on the first surface of the pressure relief member.

[0009] According to some embodiments of the present application, the first surface is a curved surface convex toward the interior of the battery cell.

[0010] With this arrangement, when the battery cell is used inverted, the bottom wall is located at the bottom of the battery cell, and the first surface is an upwardly convex curved surface, which can guide the electrolyte to flow from the middle of the first surface to the periphery, avoiding the accumulation of electrolyte on the first surface of the pressure relief member.

[0011] According to some embodiments of the present application, a pressure relief hole is provided on the bottom wall, and the pressure relief member covers the pressure relief hole from a side of the bottom wall facing the interior of the battery cell.

[0012] With this arrangement, the pressure relief member is disposed on the side of the bottom wall facing the interior of the battery cell, which can reduce the possibility of the pressure relief member being damaged due to contact with external foreign matter.

[0013] According to some embodiments of the present application, an annular protrusion is formed on a side of the bottom wall facing the interior of the battery cell, the annular protrusion is arranged around the pressure relief hole, and an edge of the pressure relief member is connected to the annular protrusion.

[0014] With this arrangement, when the battery cell is used inverted, the annular protrusion protrudes upward from the bottom wall, and the edge of the pressure relief piece is connected to the annular protrusion and covers the pressure relief hole. This not only enables the first surface to be located on the upper side of the bottom wall to prevent the electrolyte from being immersed in the first surface of the pressure relief piece, but also enables the pressure relief piece to be arranged on the side of the bottom wall facing the interior of the battery cell, thereby improving the safety performance of the battery cell.

[0015] According to some embodiments of the present application, an annular groove is provided on the end surface of the annular protrusion, the annular groove is provided around the pressure relief hole, and the edge of the pressure relief member is provided in the annular groove.

[0016] This arrangement can not only reduce the degree to which the pressure relief member protrudes from the end face of the annular protrusion, thus avoiding excessive occupation of the internal space of the battery cell by the pressure relief member and improving the energy density of the battery cell, but also facilitate positioning of the pressure relief member when it is installed on the annular protrusion.

[0017] According to some embodiments of the present application, the end face of the annular protrusion is an inclined surface inclined relative to the thickness direction of the bottom wall, and the edge of the pressure relief member is connected to the end face of the annular protrusion.

[0018] With this arrangement, under the condition of the same actuation area of ​​the pressure relief member, the pressure relief hole has a smaller aperture, thereby being able to reduce the aperture of the pressure relief hole and reduce the influence of the arrangement of the pressure relief hole on the strength of the bottom wall.

[0019] According to some embodiments of the present application, the battery cell further includes: a protective film, wherein the protective film covers the pressure relief hole from a side of the bottom wall facing away from the interior of the battery cell.

[0020] This arrangement can prevent foreign matter from entering the pressure relief hole from outside the battery cell, thereby preventing external foreign matter from coming into contact with the pressure relief component to cause damage or scratches to the pressure relief component. It can also prevent moisture or other liquids from entering the pressure relief hole to corrode the pressure relief component.

[0021] According to some embodiments of the present application, the bottom wall includes a first part and a second part, the second part is arranged around the first part, and along the thickness direction of the bottom wall, the first part protrudes from the second part toward the outside of the battery cell, and a recess is formed at a position corresponding to the first part on the side of the bottom wall facing the inside of the battery cell, and the pressure relief piece is arranged on the first part.

[0022] With this arrangement, the pressure relief member can be set up in the recessed space on the bottom wall facing the interior of the battery cell, thereby avoiding the pressure relief member from occupying the interior space of the battery cell. This allows more space inside the battery cell to arrange the electrode assembly, thereby improving the energy density of the battery cell.

[0023] According to some embodiments of the present application, along a direction from the bottom wall to the top wall, the first surface does not exceed a side of the second portion facing the interior of the battery cell.

[0024] With this arrangement, the maximum outer dimension of the assembly of the bottom wall and the pressure relief member does not exceed the maximum outer dimension of the pressure relief member, so that there is more space inside the battery cell to arrange the electrode assembly, thereby improving the energy density of the battery cell.

[0025] According to some embodiments of the present application, the top wall and the side walls are integrally formed, and the bottom wall and the side walls are separately provided.

[0026] With this arrangement, the bottom wall and the side walls are integrally formed and constructed into a shell with an opening. The bottom wall is assembled with the pressure relief piece and then connected to the side walls, which simplifies the assembly process of the pressure relief piece and the bottom wall and reduces the manufacturing cost of the battery cell.

[0027] According to some embodiments of the present application, the battery cell further includes: an electrode terminal, wherein the electrode terminal is disposed on the bottom wall.

[0028] With this arrangement, the electrode terminals are disposed on the bottom wall, and the electrode terminals are used to lead the electric energy of the battery cell to the outside of the battery cell.

[0029] The second embodiment of the present application provides a battery, including the battery cell provided in the first embodiment of the present application.

[0030] Due to the characteristics of the battery cell proposed in the first embodiment of the present application, the battery in the second embodiment of the present application also has good safety performance.

[0031] The third aspect of the present application provides an electrical device, including the battery provided in the second aspect of the present application, wherein the battery is used to provide electrical energy.

[0032] Due to the characteristics of the battery cell proposed in the first embodiment of the present application, the electrical device in the third embodiment of the present application also has good safety performance.

[0033] A fourth aspect of the present application provides a method for manufacturing a battery cell, comprising:

[0034] Providing a housing, the housing comprising a top wall, a side wall and a bottom wall, the top wall and the bottom wall are arranged opposite to each other, and the side wall connects the top wall and the bottom wall;

[0035] Providing a pressure relief member, the pressure relief member being configured to be actuated to release the pressure inside the battery cell when the internal pressure or temperature of the battery cell reaches a threshold value, the pressure relief member having a first surface, the first surface being configured to guide the electrolyte toward the periphery of the pressure relief member;

[0036] The pressure relief member is disposed on the bottom wall so that the first surface faces the interior of the battery cell.

[0037] A fifth aspect of the present application provides a battery cell manufacturing device, including:

[0038] A first providing device is used to provide a housing, the housing comprising a top wall, a side wall and a bottom wall, the top wall and the bottom wall are arranged opposite to each other, and the side wall connects the top wall and the bottom wall;

[0039] A second providing device, configured to provide a pressure relief member, wherein the pressure relief member is configured to be actuated to release the pressure inside the battery cell when the internal pressure or temperature of the battery cell reaches a threshold value, and the pressure relief member has a first surface, and the first surface is configured to guide the electrolyte to the periphery of the pressure relief member;

[0040] An assembly module is used to arrange the pressure relief member on the bottom wall so that the first surface faces the interior of the battery cell.

[0041] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 Shown is a simplified schematic diagram of a vehicle in one embodiment of the present application;

[0044] Figure 2 It is shown that Figure 1 A schematic diagram of the structure of the battery of the vehicle;

[0045] Figure 3 Shown is an exploded view of a battery cell according to some embodiments of the present application;

[0046] Figure 4 Shown is a cross-sectional view of a form of an end cap assembly of a battery cell 10 of some embodiments of the present application (the first insulating member is not shown);

[0047] Figure 5 It is shown that Figure 4 A partial enlarged view of the middle A;

[0048] Figure 6 Shown is a cross-sectional view of another form of an end cap assembly of a battery cell 10 of some embodiments of the present application (the first insulating member is not shown);

[0049] Figure 7 It is shown that Figure 6 A partial enlarged view of point B in the middle;

[0050] Figure 8 Shown is a structural schematic diagram of an end cover assembly of a battery cell of some embodiments of the present application from one perspective (the first insulating member is not shown);

[0051] Fig. 9 Shown is a schematic structural diagram of the bottom wall of a battery cell in some embodiments of the present application;

[0052] Fig.10 Shown is a schematic diagram of a method for manufacturing a battery cell according to some embodiments of the present application;

[0053] Fig.11 Shown is a schematic structural diagram of a battery cell manufacturing device according to some embodiments of the present application;

[0054] The above drawings are not provided to scale.

[0055] Icons: 1000-vehicle; 100-battery; 10-battery cell; 11-housing; 111-bottom wall; 1111-first side; 1112-second side; 1113-pressure relief hole; 1114-second surface; 1115-sink; 1116-first part; 1117-second part; 1118-recess; 1119-third surface; 112-side wall; 113-top wall; 114-annular protrusion; 1141-end face; 1142-annular groove; 12-electrode assembly; 121-body; 122-first pole Ear; 123-second pole ear; 13-electrode terminal; 14-current collecting member; 15-pressure relief member; 151-first surface; 1511-first edge; 1512-second edge; 1513-circumferential edge; 1514-center of curved surface; 16-first insulating member; 17-protective film; 20-housing; 21-first housing; 22-second housing; 200-controller; 300-motor; 2000-battery cell manufacturing equipment; 2100-first providing device; 2200-second providing device; 2300-assembly module. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution 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 part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0057] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0058] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0059] It should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", and "attachment" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0060] The term "plurality" used in the present application refers to two or more (including two).

[0061] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells.

[0062] 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 the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells, and the box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0063] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current can pass without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a laminated structure, and the embodiments of the present application are not limited thereto.

[0064] The battery cell also includes a pressure relief member, which is actuated when the internal pressure of the battery cell reaches a threshold value. The threshold design varies according to different design requirements. The threshold value may depend on one or more materials of the positive electrode plate, negative electrode plate, electrolyte and isolation membrane of the battery cell. The pressure relief member can take the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and can specifically adopt a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell reaches a threshold value, the pressure relief member performs an action or a weak structure provided in the pressure relief member is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0065] The "actuation" mentioned in this application refers to the action of the pressure relief component or its activation to a certain form, so that the internal pressure and temperature of the battery cell can be released. The action of the pressure relief component may include but is not limited to: at least a part of the pressure relief component is ruptured, broken, torn or opened, etc. When the pressure relief component is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged from the open part as emissions. In this way, the pressure and temperature of the battery cell can be released under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0066] The battery cell also includes a current collecting component, which is used to electrically connect the tabs and electrode terminals of the battery cell to transmit electrical energy from the electrode assembly to the electrode terminals and then to the outside of the battery cell through the electrode terminals; multiple battery cells are electrically connected through a current collecting component to achieve series, parallel or mixed connection of multiple battery cells.

[0067] In the related art, the pressure relief part is activated when the internal pressure of the battery cell reaches a threshold value to release the temperature or pressure inside the battery cell. Since the high-temperature and high-pressure gas is ejected outward from the pressure relief part, it is easy to enter the passenger compartment, scald passengers and cause fire. In order to improve the safety performance of the battery cell, there is currently a method of using the battery cell inverted so that the pressure relief part is located at the bottom of the battery cell. When the pressure relief part is activated, the high-temperature and high-pressure gas is ejected toward the lower side, which will not cause damage to the passenger compartment.

[0068] The inventor has found through research that during the use of the battery cell, there may be free electrolyte inside the battery cell, and the electrolyte accumulates inside the battery cell. When the electrode assembly and the shell are short-circuited, it will cause electrochemical corrosion to the shell and the parts that are conductively connected to the shell and have accumulated electrolyte, causing leakage in these parts. When the battery cell is used upside down, the pressure relief piece is located at the bottom of the battery cell, and the thickness of the pressure relief piece is less than the thickness of the shell. In the presence of electrochemical corrosion, it may leak first, causing the battery cell to fail prematurely.

[0069] Based on the above ideas, the present application proposes a new technical solution, which guides the electrolyte to flow around the pressure relief part when the battery is inverted and used, so as to avoid the electrolyte from accumulating in the pressure relief part and the leakage of the pressure relief part due to electrochemical corrosion, thereby improving the safety performance of the battery cell and ensuring the service life of the battery cell.

[0070] It is understandable that the battery cells described in the embodiments of the present application can directly power electrical devices, or can form battery modules or batteries in parallel or series to power various electrical devices in the form of battery 100 modules or batteries.

[0071] It can be understood that the electrical devices used in the embodiments of the present application using battery cells, battery modules or batteries can be in various forms, for example, mobile phones, portable devices, laptop computers, electric vehicles, electric vehicles, ships, spacecraft, electric toys and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0072] The battery cells, battery modules or batteries described in the embodiments of the present application are not limited to the electrical devices described above, but can also be applied to all electrical devices using battery cells, battery modules and batteries. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0073] Figure 1 Shown is a simplified schematic diagram of a vehicle in one embodiment of the present application; Figure 2 It is shown that Figure 1 Schematic diagram of the structure of the battery of a vehicle.

[0074] like Figure 1 As shown, a battery 100, a controller 200 and a motor 300 are arranged inside the vehicle 1000. For example, the battery 100 can be arranged at the bottom, front or rear of the vehicle 1000. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended range vehicle.

[0075] In some embodiments of the present application, the battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. The controller 200 is used to control the battery 100 to power the motor 300, for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0076] In other embodiments, the battery 100 can not only serve as an operating power source for the vehicle 1000 , but also serve as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0077] The battery 100 mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity. Multiple battery cells 10 can be connected in series, in parallel or in mixed connection to directly form the battery 100. Mixed connection means that multiple battery cells 10 are both connected in series and in parallel. Multiple battery cells 10 can also be connected in series, in parallel or in mixed connection to form a battery module, and multiple battery modules can then be connected in series, in parallel or in mixed connection to form the battery 100.

[0078] like Figure 2 As shown, the battery 100 includes a plurality of battery cells 10 and a box 20, and the plurality of battery cells 10 are placed in the box 20. The box 20 includes a first box 21 and a second box 22, and the first box 21 and the second box 22 are covered with each other to form a battery cavity, and a plurality of battery modules are placed in the battery 100 cavity. Among them, the shapes of the first box 21 and the second box 22 can be determined according to the shapes of the combination of multiple battery modules, and the first box 21 and the second box 22 can both have an opening. For example, the first box 21 and the second box 22 can both be hollow cuboids and each has only one face as an opening face, the openings of the first box 21 and the second box 22 are arranged oppositely, and the first box 21 and the second box 22 are buckled together to form a box 20 with a closed chamber. After the plurality of battery cells 10 are connected in parallel, in series, or in mixed series, they are placed in the box 20 formed by buckling the first box 21 and the second box 22.

[0079] Figure 3 Shown is an exploded view of a battery cell according to some embodiments of the present application.

[0080] like Figure 3 As shown, the battery cell 10 includes a housing 11, an electrode assembly 12, an electrode terminal 13, a current collecting member 14, and a pressure relief member 15 (see Figure 5 ) and a first insulating member 16.

[0081] The housing 11 includes a housing and an end cap, the housing is provided with an opening, and the end cap covers the opening to seal the electrode assembly 12 inside the housing. Specifically, the housing 11 includes a bottom wall 111, a side wall 112, and a top wall 113, the side wall 112 and the top wall 113 are arranged opposite to each other, the side wall 112 is arranged around the bottom wall 111, the side wall 112 connects the top wall 113 and the bottom wall 111, the electrode assembly 12 is arranged inside the housing 11, at least one of the bottom wall 111 and the top wall 113 is provided with an electrode lead-out hole, and the electrode terminal 13 is insulated and installed in the electrode lead-out hole.

[0082] In some embodiments of the present application, the top wall 113 and the side wall 112 are integrally formed to form a shell, one end of the shell has an opening, the bottom wall 111 is separately provided with the side wall 112, the bottom wall 111 is configured as an end cap, and the bottom wall 111 covers the opening of the shell to seal the electrode assembly 12 inside the shell. The bottom wall 111 is provided with two electrode lead-out holes, and the number of electrode terminals 13 is two, and the two electrode terminals 13 are both provided on the bottom wall 111 to lead the electric energy out of the battery cell 10. The pressure relief member 15 is provided on the bottom wall 111, and the pressure relief member 15 is configured to be actuated to release the pressure inside the battery cell 10 when the internal pressure or temperature of the battery cell 10 reaches a threshold value, and the bottom wall 111, the electrode terminals 13 and the pressure relief member 15 provided on the bottom wall 111 and the first insulating member 16 together constitute an end cap assembly.

[0083] In other embodiments, the bottom wall 111 and the side wall 112 may be integrally formed to form a shell, one end of the shell has an opening, the top wall 113 and the side wall 112 are separately arranged, the top wall 113 is configured as an end cover, the two electrode terminals 13 are both arranged on the top wall 113, and the top wall 113, the electrode terminals 13 arranged on the top wall 113 and other components together constitute an end cover assembly.

[0084] The shell can be hexahedral, cylindrical or elliptical. The shell can be made of metal materials, such as aluminum, aluminum alloy or nickel-plated steel. The end cap is a plate-like structure, the size and shape of the end cap match the opening of the shell, and the end cap is fixed to the opening of the shell, so that the electrode assembly 12 and the electrolyte are enclosed in the housing cavity of the shell. The end cap is made of metal materials, such as aluminum, steel and other materials.

[0085] In some embodiments of the present application, the shell may be a hexahedron, and the end cover may be a square or rectangular plate structure.

[0086] Specifically, the length direction of the shell extends along the first direction X, the width direction extends along the second direction Y, and the height direction extends along the third direction Z. The shape of the end cover matches the opening of the shell, the length direction of the end cover extends along the first direction X, the width direction extends along the second direction Y, and the thickness direction extends along the third direction Z.

[0087] In other embodiments, the shell may also be a cylinder or an elliptical cylinder, and the end cover may be a circular plate or an elliptical plate structure.

[0088] The electrode assembly 12 is disposed in the housing 11, and the electrode assembly 12 includes a main body 121, a first pole tab 122, and a second pole tab 123. The main body 121 includes a positive pole sheet, a negative pole sheet, and a separator, and the separator is located between the positive pole sheet and the negative pole sheet, and is used to separate the positive pole sheet from the negative pole sheet. The polarities of the first pole tab 122 and the second pole tab 123 are opposite, and two electrode terminals 13 are provided, and the polarities of the two electrode terminals 13 are opposite. The first pole tab 122 is connected to the electrode terminal 13 of the same polarity through one current collecting member 14, and the second pole tab 123 is electrically connected to the electrode terminal 13 of the same polarity through another. Of the first pole tab 122 and the second pole tab 123, the first pole tab 122 is a positive pole tab, and the second pole tab 123 is a negative pole tab. The material of the current collecting member 14 corresponding to the first pole tab 122 is aluminum, and the material of the current collecting member 14 corresponding to the second pole tab 123 is copper.

[0089] In some embodiments of the present application, the first insulating member 16 is disposed between the bottom wall 111 and the electrode assembly 12 to insulate and isolate the bottom wall 111 from the electrode assembly 12. For example, the first insulating member 16 is a lower plastic, the first insulating member 16 is connected to the bottom wall 111, and insulates and isolates the current collecting member 14 from the bottom wall 111, and the first insulating member 16 has a through hole to allow the pressure relief member 15 of the bottom wall 111 to communicate with the electrode assembly 12 gas, and when thermal runaway occurs inside the battery cell 10, the high-temperature and high-pressure gas inside the battery cell 10 can smoothly actuate the pressure relief member 15. In other embodiments, the first insulating member 16 can also be disposed between the top wall 113 and the electrode assembly 12 to insulate and isolate the top wall 113 from the electrode assembly 12.

[0090] Figure 4 Shown is a cross-sectional view of a form of an end cap assembly of a battery cell 10 of some embodiments of the present application (the first insulating member is not shown); Figure 5 It is shown that Figure 4 A partial enlarged view of the middle A;

[0091] Figure 6 Shown is a cross-sectional view of another form of an end cap assembly of a battery cell 10 of some embodiments of the present application (the first insulating member is not shown); Figure 7 It is shown that Figure 6 A partial enlarged view of point B in the middle.

[0092] like Figure 3As shown, some embodiments of the present application provide a battery cell 10, including a housing 11 and a pressure relief member 15. The housing 11 includes a top wall 113, a side wall 112, and a bottom wall 111. The top wall 113 and the bottom wall 111 are arranged opposite to each other, and the side wall 112 connects the top wall 113 and the bottom wall 111. The pressure relief member 15 is arranged on the bottom wall 111, and the pressure relief member 15 is configured to be actuated to release the pressure inside the battery cell 10 when the internal pressure or temperature of the battery cell 10 reaches a threshold value. Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the pressure relief member 15 has a first surface 151 facing the interior of the battery cell 10 , and the first surface 151 is configured to guide the electrolyte toward the periphery of the pressure relief member 15 .

[0093] It can be understood that the bottom wall 111 is located at the bottom of the battery cell 10, the pressure relief member 15 is disposed at the bottom of the battery cell 10, the top wall 113 is located at the top of the battery cell 10, the bottom wall 111 and the top wall 113 are disposed opposite to each other along the third direction Z, and the electrode assembly 12 is disposed between the bottom wall 111 and the top wall 113. When the battery cell 10 is used inverted, the third direction Z extends along the direction of gravity, and the first surface 151 of the pressure relief member 15 is disposed upward. Under the action of gravity, the electrolyte flows to the periphery of the pressure relief member 15, so that it will not accumulate on the pressure relief member 15.

[0094] Specifically, along the thickness direction of the bottom wall 111 (i.e., the third direction Z), the side of the bottom wall 111 facing the inside of the battery cell 10 has a second surface 1114, and along the XY direction, the projection contour of the pressure relief member 15 falls into the projection contour of the second surface 1114. When the battery cell 10 is used upside down, the first surface 151 of the pressure relief member 15 is located on the upper side of the second surface 1114 of the bottom wall 111, and the first surface 151 guides the electrolyte to the periphery of the pressure relief member 15, and flows from the periphery of the pressure relief member 15 to the second surface 1114 of the bottom wall 111.

[0095] It is understandable that the pressure relief member 15 is a thin sheet structure made of metal material, and the thickness of the pressure relief member 15 is less than the thickness of the outer shell 11. When the internal pressure or temperature of the battery cell 10 reaches a threshold, the pressure relief member 15 ruptures before the outer shell 11 to release the pressure inside the battery cell 10. The pressure relief member 15 can be a thin sheet structure of equal thickness, and the thickness of the pressure relief member 15 corresponds to the preset actuation pressure or temperature; the pressure relief member 15 can also have a weak structure, and when the pressure or temperature inside the battery cell 10 reaches a threshold, the weak structure ruptures before the rest of the pressure relief member 15 to release the pressure inside the battery cell 10.

[0096] The pressure relief member 15 may be a component integrally formed with the bottom wall 111, or a pressure relief hole 1113 may be provided on the bottom wall 111. The pressure relief member 15 and the bottom wall 111 are separately provided and connected in the form of welding, and the pressure relief member 15 covers the pressure relief hole 1113. The pressure relief member 15 may be provided in the middle of the bottom wall 111 and between the two electrode terminals 13; the pressure relief member 15 may also be provided at other positions of the bottom wall 111. The shape of the pressure relief member 15 may be a circular, oval or square sheet structure, or a sheet structure of other shapes.

[0097] There are many implementations for the first surface 151 of the pressure relief member 15 to guide the electrolyte to flow toward the periphery of the pressure relief member 15. For example, the first surface 151 can be substantially flat, guiding the electrolyte to flow from one side of the pressure relief member 15 to the other side; for example, the first surface 151 can be a curved surface, guiding the electrolyte to flow from the middle of the pressure relief member 15 to the periphery.

[0098] In the battery cell 10 of the embodiment of the present application, the pressure relief member 15 has a first surface 151 facing the inside of the battery cell 10. When the battery cell 10 is used upside down, the first surface 151 of the pressure relief member 15 can guide the electrolyte to diffuse around the pressure relief member 15 and accumulate in other parts of the battery cell 10. Since the electrolyte does not accumulate on the first surface 151 of the pressure relief member 15, it will not corrode the pressure relief member 15 and cause the battery cell 10 to leak prematurely, thereby improving the safety performance and effective service life of the battery cell 10.

[0099] In some embodiments of the present application, the first surface 151 is an inclined surface that is inclined relative to the thickness direction of the bottom wall 111 .

[0100] Specifically, the thickness direction of the bottom wall 111 extends along the third direction Z, the first surface 151 is a plane, and the normal direction of the first surface 151 is inclined with respect to the third direction.

[0101] The first surface 151 may be arranged to be inclined along the length direction (ie, the first direction X) of the bottom wall 111 , or may be arranged to be inclined along the width direction (ie, the second direction Y) of the bottom wall 111 or other directions.

[0102] For example, Figure 4 and Figure 5As shown, in some embodiments of the present application, along the first direction X, the two oppositely disposed edges of the first surface 151 are respectively the first edge 1511 and the second edge 1512, and the distance between the first surface 151 and the second surface 1114 gradually decreases from the first edge 1511 toward the second edge 1512. When the battery cell 10 is used inverted, the first edge 1511 is located on the upper side of the second edge 1512, and the electrolyte flows from the first edge 1511 of the first surface 151 to the second edge 1512 under the action of gravity. In other embodiments, the distance between the first surface 151 and the second surface 1114 may also gradually decrease from one side edge to the other side edge along the second direction Y, and the electrolyte flows from one side edge to the other side edge along the second direction Y under the action of gravity.

[0103] In the above scheme, when the battery cell 10 is used inverted, the thickness direction of the bottom wall 111 extends along the direction of gravity, and the first edge 1511 of the first surface 151 is higher than the second edge 1512, which can guide the electrolyte to flow from the high side edge to the low side edge of the first surface 151, thereby avoiding the accumulation of electrolyte on the first surface 151 of the pressure relief member 15.

[0104] In some embodiments of the present application, the first surface 151 is a curved surface convex toward the inside of the battery cell 10 .

[0105] Specifically, if Figure 6 and Figure 7 As shown, the thickness direction of the bottom wall 111 extends along the third direction Z, and the first surface 151 includes a curved surface center 1514 and a circumferential edge 1513, and the circumferential edge 1513 is arranged around the curved surface center 1514. When the battery cell 10 is used upside down, the curved surface center 1514 is higher than the circumferential edge 1513, and the electrolyte flows from the curved surface center 1514 to the circumferential edge 1513 under the action of gravity.

[0106] The center of the curved surface 1514 can be aligned with the geometric center of the insulating part along the third direction Z to guide the electrolyte to flow evenly toward the circumferential edge 1513; the center of the curved surface 1514 can also be staggered with the geometric center of the first surface 151 along the third direction Z to avoid other components inside the battery cell 10 and reasonably utilize the space inside the battery cell 10.

[0107] In the above scheme, when the battery cell 10 is used inverted, the bottom wall 111 is located at the bottom of the battery cell 10, and the first surface 151 is an upwardly convex curved surface, which can guide the electrolyte to flow from the curved surface center 1514 of the first surface 151 to the circumferential edge 1513, thereby avoiding the electrolyte from accumulating on the first surface 151 of the pressure relief member 15.

[0108] like Figure 4 and Figure 5 As shown, in some embodiments of the present application, a pressure relief hole 1113 is provided on the bottom wall 111 , and the pressure relief member 15 covers the pressure relief hole 1113 from a side of the bottom wall 111 facing the interior of the battery cell 10 .

[0109] Along the thickness direction of the bottom wall 111 (i.e., the third direction Z), the opposite sides of the bottom wall 111 are respectively a first side 1111 and a second side 1112, wherein the first side 1111 of the bottom wall 111 is the side facing the interior of the battery cell 10, and the second side 1112 is the side away from the interior of the battery cell 10.

[0110] On the XY plane, the projection contour of the pressure relief hole 1113 is located inside the projection contour of the second surface 1114 of the bottom wall 111, and the edge of the pressure relief member 15 is directly or indirectly connected to the second surface 1114 of the bottom wall 111 to cover the pressure relief hole 1113 from the first side 1111 of the bottom wall 111.

[0111] The edge of the pressure relief member 15 can be directly connected to the second surface 1114 of the bottom wall 111, and the edge of the pressure relief member 15 is arranged flush with the second surface 1114 of the bottom wall 111; the bottom wall 111 can also have a boss structure (such as the annular boss described below), and the pressure relief member 15 is arranged at the end of the boss structure so that the edge of the pressure relief member 15 is closer to the interior of the battery cell 10 relative to the second surface 1114, so that when the battery cell 10 is inverted for use, there is a height difference between the edge of the first surface 151 and the second surface 1114, thereby avoiding the accumulation of electrolyte on the edge of the first surface 151.

[0112] In the above solution, the pressure relief member 15 is disposed on the side of the bottom wall 111 facing the inside of the battery cell 10 , which can reduce the possibility of the pressure relief member 15 being damaged by contact with external foreign matter.

[0113] like Figure 5 As shown, in some embodiments of the present application, an annular protrusion 114 is formed on one side of the bottom wall 111 facing the interior of the battery cell 10 . The annular protrusion 114 is arranged around the pressure relief hole 1113 , and the edge of the pressure relief member 15 is connected to the annular protrusion 114 .

[0114] Specifically, the annular protrusion 114 is arranged on the first side 1111 of the bottom wall 111. Along the axial direction of the annular protrusion 114, one end of the annular protrusion 114 is connected to the second surface 1114 of the bottom wall 111, and the other end has an end face 1141. The pressure relief hole 1113 penetrates the annular protrusion 114 and the bottom wall 111 along the axial direction of the annular protrusion 114.

[0115] The central axis of the pressure relief hole 1113 and the central axis of the annular protrusion 114 can be arranged to overlap, and the central axis of the pressure relief hole 1113 and the central axis of the annular protrusion 114 can also be arranged in parallel and side by side, or arranged at an angle. The central axis of the annular protrusion 114 can be parallel to the thickness direction of the bottom wall 111 (i.e., the third direction Z), or can be arranged at an angle to the thickness direction of the bottom wall 111. The annular protrusion 114 and the bottom wall 111 can be an integrally formed structure, and the annular protrusion 114 and the bottom wall 111 can also be arranged separately and assembled into one by welding or bonding. The annular protrusion 114 can be a cylindrical or elliptical cylindrical protrusion, or a square cylindrical protrusion or a protrusion of other shapes.

[0116] Based on the implementation form of "the first surface 151 is a plane", the end surface 1141 of the annular protrusion 114 and the second surface 1114 can be arranged in parallel, and the edge of the pressure relief member 15 is connected to the end surface 1141 of the annular protrusion 114. The distance between the first surface 151 and the second surface 1114 is changed by controlling the thickness change of the pressure relief member 15 to guide the electrolyte to flow around the pressure relief member 15. The end surface 1141 of the annular protrusion 114 can also be arranged obliquely with respect to the second surface 1114, and the first surface 151 and the second surface 1114 are arranged obliquely with respect to the second surface 1114 by the inclination angle of the end surface 1141 and the second surface 1114.

[0117] In the above scheme, when the battery cell 10 is used inverted, the annular protrusion 114 protrudes upward from the bottom wall 111, and the edge of the pressure relief member 15 is connected to the annular protrusion 114 and covers the pressure relief hole 1113, which not only enables the first surface 151 to be located on the upper side of the bottom wall 111 to prevent the electrolyte from being immersed in the first surface 151 of the pressure relief member 15, but also enables the pressure relief member 15 to be set on the first side 1111 of the bottom wall 111, thereby improving the safety performance of the battery cell 10.

[0118] like Figure 5 As shown, in some embodiments of the present application, an annular groove 1142 is provided on the end surface 1141 of the annular protrusion 114 , the annular groove 1142 is provided around the pressure relief hole 1113 , and the edge of the pressure relief member 15 is provided in the annular groove 1142 .

[0119] Specifically, the annular groove 1142 is formed by the depression of the end face 1141 of the annular protrusion 114 , and the shape of the annular groove 1142 matches the edge profile of the pressure relief member 15 . The annular groove 1142 is used to accommodate the pressure relief member 15 so that the pressure relief member 15 covers the pressure relief hole 1113 from the first side 1111 of the bottom wall 111 .

[0120] The central axis of the annular groove 1142 can coincide with the central axis of the pressure relief hole 1113, so that the pressure relief member 15 covers the pressure relief hole 1113 in the center; the central axis of the annular groove 1142 and the central axis of the pressure relief hole 1113 can also be staggered. The depth of the annular groove 1142 can be equal to the thickness of the edge of the pressure relief member 15, so that the height of the annular protrusion 114 will not be increased after the pressure relief member 15 is installed on the end face 1141 of the annular protrusion 114; the depth of the annular groove 1142 can also be greater than the thickness of the edge of the pressure relief member 15, so that while accommodating the pressure relief member 15, it also accommodates the weld mark protrusion when the pressure relief member 15 is welded to the bottom wall 111.

[0121] In the above scheme, not only can the degree to which the pressure relief member 15 protrudes from the end surface 1141 of the annular protrusion 114 be reduced, thereby avoiding the pressure relief member 15 from excessively occupying the internal space of the battery cell 10 and improving the energy density of the battery cell 10, but it can also facilitate positioning of the pressure relief member 15 when it is installed on the annular protrusion 114.

[0122] In some embodiments of the present application, the end surface 1141 of the annular protrusion 114 is an inclined surface inclined relative to the thickness direction of the bottom wall 111 , and the edge of the pressure relief member 15 is connected to the end surface 1141 of the annular protrusion 114 .

[0123] like Figure 5 As shown, based on the aforementioned implementation of "the first surface 151 is a plane", the pressure relief member 15 can be a thin sheet structure of equal thickness, and the end face 1141 of the annular protrusion 114 is arranged parallel to the first surface 151; the pressure relief member 15 can also be a thin sheet structure of non-equal thickness, and the end face 1141 of the annular protrusion 114 is inclined to the first surface 151, so as to reasonably adapt to the thickness change of the pressure relief member 15, so that the inclination angle between the first surface 151 and the second surface 1114 meets the requirements.

[0124] In the above solution, under the condition of the same actuating area of ​​the pressure relief member 15 , the pressure relief hole 1113 has a smaller aperture, so that the aperture of the pressure relief hole 1113 can be reduced, and the influence of the arrangement of the pressure relief hole 1113 on the strength of the bottom wall 111 is reduced.

[0125] like Figure 5 As shown, in some embodiments of the present application, the battery cell 10 further includes a protective film 17 , and the protective film 17 covers the pressure relief hole 1113 from a side of the bottom wall 111 facing away from the interior of the battery cell 10 .

[0126] Specifically, the protective film 17 covers the pressure relief hole 1113 from the second side 1112 of the bottom wall 111. The protective film 17 can be a plastic film, or a silicone film or a waterproof paper film. The protective film 17 can be adhered to the bottom wall 111, or connected to the bottom wall 111 using an annular connector to fix the protective film 17 to the bottom wall 111.

[0127] The protective film 17 can cover the pressure relief hole 1113 in various implementation forms. In some embodiments of the present application, the surface of the second side 1112 of the bottom wall 111 corresponding to the pressure relief hole 1113 is recessed to form a sink 1115, the protective film 17 is disposed in the sink 1115, the edge of the pressure relief hole 1113 protrudes from the bottom surface of the sink 1115, the protective film 17 covers the edge of the pressure relief hole 1113, and is accommodated in the sink 1115. In other embodiments, the surface of the second side 1112 of the bottom wall 111 corresponding to the pressure relief hole 1113 can be a plane, and the protective film 17 protrudes from the second side 1112 of the bottom wall 111.

[0128] In the above scheme, foreign matter can be prevented from entering the pressure relief hole 1113 from the outside of the battery cell 10, thereby preventing external foreign matter from contacting the pressure relief component 15 to cause damage or scratches to the pressure relief component 15, and also preventing moisture or other liquids from entering the pressure relief hole 1113 to corrode the pressure relief component 15.

[0129] Figure 8 Shown is a structural schematic diagram of an end cover assembly of a battery cell of some embodiments of the present application from one perspective (the first insulating member is not shown); Fig. 9 Shown is a schematic structural diagram of the bottom wall of a battery cell according to some embodiments of the present application.

[0130] like Figure 7 , Figure 8 and Fig. 9 As shown, in some embodiments of the present application, the bottom wall 111 includes a first part 1116 and a second part 1117, and the second part 1117 is arranged around the first part 1116. Along the thickness direction of the bottom wall 111 (i.e., the third direction Z), the first part 1116 protrudes from the second part 1117 toward the outside of the battery cell 10, and a recess 1118 is formed at a position corresponding to the first part 1116 on the side of the bottom wall 111 facing the inside of the battery cell 10, and the pressure relief member 15 is arranged on the first part 1116.

[0131] Specifically, the second side 1112 of the bottom wall 111 has a convex portion, a concave portion 1118 is formed at a position corresponding to the convex portion on the first side 1111 of the bottom wall 111, and the second surface 1114 is the bottom surface of the concave portion 1118. When the battery cell 10 is used upside down, the second surface 1114 is the lowest surface of the first side 1111 of the bottom wall 111, the annular protrusion 114 protrudes upward from the second surface 1114, and a pressure relief member 15 is provided at the other end, and the first surface 151 is located on the upper side of the second surface 1114. When there is free electrolyte inside the battery cell 10, the electrolyte flows from the first surface 151 to the edge of the pressure relief member 15 and accumulates in the concave portion 1118.

[0132] In the above solution, the pressure relief member 15 is arranged in the recess 1118 of the bottom wall 111 to avoid the pressure relief member 15 from occupying the internal space of the battery cell 10, so that there is more space inside the battery cell 10 to arrange the electrode assembly 12, thereby improving the energy density of the battery cell 10.

[0133] In some embodiments of the present application, along the direction from the bottom wall 111 to the top wall 113 , the first surface 151 does not exceed the side of the second portion 1117 facing the interior of the battery cell 10 .

[0134] like Figure 6 , Figure 7 and Fig. 9 Specifically, the first side 1111 of the bottom wall 111 further includes a third surface 1119. The third surface 1119 is a surface of the second portion 1117 located on the first side 1111. The third surface 1119 and the side wall 112 (such as Figure 3 Along the direction from the bottom wall 111 to the top wall 113, the first surface 151 does not exceed the third surface 1119. When the battery cell 10 is used upside down, the bottom wall 111 is located at the lower side of the top wall 113, and the third surface 1119 is located at the upper side of the first surface 151.

[0135] In the above solution, the maximum outer dimension of the assembly of the bottom wall 111 and the pressure relief member 15 does not exceed the maximum outer dimension of the pressure relief member 15 , so that there is more space inside the battery cell 10 to arrange the electrode assembly 12 , thereby improving the energy density of the battery cell 10 .

[0136] In some embodiments of the present application, the top wall 113 and the side wall 112 are integrally formed, and the bottom wall 111 and the side wall 112 are separately provided.

[0137] In the above scheme, the bottom wall 111 and the side wall 112 are integrally formed and constructed as a shell with an opening. The bottom wall 111 is assembled into one with the pressure relief piece 15 and then connected to the side wall 112, which simplifies the assembly process of the pressure relief piece 15 and the bottom wall 111 and reduces the manufacturing cost of the battery cell 10.

[0138] In some embodiments of the present application, the battery cell 10 further includes: an electrode terminal 13 , which is disposed on the bottom wall 111 .

[0139] In the above solution, the electrode terminal 13 is disposed on the bottom wall 111 , and the electrode terminal 13 is used to lead the electric energy of the battery cell 10 to the outside of the battery cell 10 .

[0140] Some embodiments of the present application provide a battery 100 , including a battery cell 10 provided in some embodiments of the present application.

[0141] Due to the characteristics of the battery cells 10 of some embodiments of the present application, the batteries 100 of some embodiments of the present application also have good safety performance.

[0142] Some embodiments of the present application provide an electrical device, including a battery 100 provided in some embodiments of the present application, and the battery 100 is used to provide electrical energy.

[0143] Due to the characteristics of the battery cell 10 proposed in some embodiments of the present application, the electrical devices in some embodiments of the present application also have good safety performance.

[0144] Fig.10 Shown is a schematic diagram of a method for manufacturing a battery cell according to some embodiments of the present application.

[0145] like Fig.10 As shown, some embodiments of the present application provide a method for manufacturing a battery cell, comprising:

[0146] S100: providing a housing 11, the housing 11 comprising a top wall 113, a side wall 112 and a bottom wall 111, the top wall 113 and the bottom wall 111 are arranged opposite to each other, and the side wall 112 connects the top wall 113 and the bottom wall 111;

[0147] S200: providing a pressure relief member 15, wherein the pressure relief member 15 is configured to be actuated to release the pressure inside the battery cell 10 when the internal pressure or temperature of the battery cell 10 reaches a threshold value, and the pressure relief member 15 has a first surface 151, and the first surface 151 is configured to guide the electrolyte to the periphery of the pressure relief member 15;

[0148] S300 : disposing the pressure relief member 15 on the bottom wall 111 , with the first surface 151 facing the interior of the battery cell 10 .

[0149] Fig.11 Shown is a schematic structural diagram of a battery cell manufacturing device according to some embodiments of the present application.

[0150] like Fig.11 As shown, some embodiments of the present application provide a battery cell manufacturing device 2000, including:

[0151] A first providing device 2100 is used to provide a housing 11, wherein the housing 11 includes a top wall 113, a side wall 112 and a bottom wall 111, wherein the top wall 113 and the bottom wall 111 are arranged opposite to each other, and the side wall 112 connects the top wall 113 and the bottom wall 111;

[0152] A second providing device 2200 is used to provide a pressure relief member 15, wherein the pressure relief member 15 is configured to be actuated to release the pressure inside the battery cell 10 when the internal pressure or temperature of the battery cell 10 reaches a threshold value, and the pressure relief member 15 has a first surface 151, and the first surface 151 is configured to guide the electrolyte to the periphery of the pressure relief member 15;

[0153] The assembly module 2300 is used to dispose the pressure relief member 15 on the bottom wall 111 so that the first surface 151 faces the interior of the battery cell 10 .

[0154] like Figures 1 to 10 As shown, some embodiments of the present application provide a battery cell 10, including a shell 11, an electrode assembly 12, an electrode terminal 13, a pressure relief member 15 and a protective film 17, the shell 11 includes an end cap and a shell, the end cap is a bottom wall 111, the shell includes a side wall 112 and a top wall 113, the shell has an opening, and the bottom wall 111 covers the opening to close the electrode assembly 12 inside the shell. Among them, an annular protrusion 114 is provided on the first side of the bottom wall 111, and an annular groove 1142 is provided on the end face 1141 of the annular protrusion 114, and the edge of the pressure relief member 15 is welded to the annular groove 1142. The pressure relief member 15 can be arranged at an angle, or it can be in a shape that protrudes into the inside of the battery cell 10. When the battery cell 10 is used upside down, the surface of the pressure relief member 15 facing the inside of the battery cell 10 is the first surface 151. Under the action of gravity, the first surface 151 can guide the electrolyte to flow to the edge of the pressure relief member 15, so that it will not accumulate on the surface of the pressure relief member 15.

[0155] In the battery cell 10 of the embodiment of the present application, the pressure relief piece 15 is welded to the bottom wall 111 at an angle, or is designed to have a shape with the middle portion bulging upward, which can prevent the pressure relief piece 15 from being immersed in the electrolyte for a long time. As a result, there is no need to increase the thickness of the pressure relief piece 15 and the thickness of the weak structure of the pressure relief piece 15, and the time required for the pressure relief piece 15 to leak due to electrochemical corrosion can be extended, thereby improving the safety performance and service life of the battery cell 10.

[0156] It should be noted that, in the absence of conflict, the features in the embodiments of this application may be combined with each other.

[0157] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: Electrode assembly; A housing, the housing comprising a top wall, a side wall and a bottom wall, the top wall and the bottom wall are arranged opposite to each other, and the side wall connects the top wall and the bottom wall; a pressure relief member disposed on the bottom wall, the pressure relief member being configured to be actuated to release the pressure inside the battery cell when the internal pressure or temperature of the battery cell reaches a threshold value; The pressure relief member has a first surface facing the electrode assembly, and the first surface is configured to guide the electrolyte toward the periphery of the pressure relief member.

2. The battery cell according to claim 1, characterized in that: The first surface is an inclined surface that is inclined relative to the thickness direction of the bottom wall.

3. The battery cell according to claim 1, characterized in that: The first surface is a curved surface convex toward the interior of the battery cell.

4. The battery cell according to claim 1, characterized in that: The bottom wall is provided with a pressure relief hole, and the pressure relief member covers the pressure relief hole from a side of the bottom wall facing the interior of the battery cell.

5. The battery cell according to claim 4, characterized in that: An annular protrusion is formed on one side of the bottom wall facing the interior of the battery cell. The annular protrusion is arranged around the pressure relief hole, and the edge of the pressure relief member is connected to the annular protrusion.

6. The battery cell according to claim 5, characterized in that: An annular groove is arranged on the end surface of the annular protrusion, the annular groove is arranged around the pressure relief hole, and the edge of the pressure relief member is arranged in the annular groove.

7. The battery cell according to claim 5, characterized in that: The end surface of the annular protrusion is an inclined surface that is inclined relative to the thickness direction of the bottom wall, and the edge of the pressure relief member is connected to the end surface of the annular protrusion.

8. The battery cell according to claim 4, characterized in that: The battery cell further comprises: A protective film covers the pressure relief hole from a side of the bottom wall that is away from the interior of the battery cell.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The bottom wall includes a first part and a second part, the second part is arranged around the first part, and along the thickness direction of the bottom wall, the first part protrudes from the second part toward the outside of the battery cell, and a recess is formed at a position corresponding to the first part on the side of the bottom wall facing the inside of the battery cell, and the pressure relief member is arranged on the first part.

10. The battery cell according to claim 9, characterized in that: Along a direction from the bottom wall to the top wall, the first surface does not extend beyond a side of the second portion facing the interior of the battery cell.

11. The battery cell according to any one of claims 1 to 8, characterized in that: The top wall and the side walls are integrally formed, and the bottom wall and the side walls are separately provided.

12. The battery cell according to any one of claims 1 to 8, characterized in that: The battery cell further comprises: The electrode terminal is arranged on the bottom wall.

13. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 12.

14. An electrical device, characterized in that: Comprising a battery as claimed in claim 13, the battery is used to provide electrical energy.

15. A method for manufacturing a battery cell, characterized in that: include: Providing a housing, the housing comprising a top wall, a side wall and a bottom wall, the top wall and the bottom wall are arranged opposite to each other, and the side wall connects the top wall and the bottom wall; Providing a pressure relief member, the pressure relief member being configured to be actuated to release the pressure inside the battery cell when the internal pressure or temperature of the battery cell reaches a threshold value, the pressure relief member having a first surface, the first surface being configured to guide the electrolyte toward the periphery of the pressure relief member; The pressure relief member is disposed on the bottom wall so that the first surface faces the electrode assembly of the battery cell.

16. A battery cell manufacturing device, characterized in that: include: A first providing device is used to provide a housing, the housing comprising a top wall, a side wall and a bottom wall, the top wall and the bottom wall are arranged opposite to each other, and the side wall connects the top wall and the bottom wall; A second providing device, configured to provide a pressure relief member, wherein the pressure relief member is configured to be actuated to release the pressure inside the battery cell when the internal pressure or temperature of the battery cell reaches a threshold value, and the pressure relief member has a first surface, and the first surface is configured to guide the electrolyte to the periphery of the pressure relief member; The assembly module is used to arrange the pressure relief member on the bottom wall so that the first surface faces the electrode assembly of the battery cell.

Images