Battery monomer, battery and electric equipment with battery monomer

Abstract

The utility model discloses a single battery, a battery and electric equipment with the same, the single battery comprises a shell, the shell is provided with a first end plate and a second end plate which are oppositely arranged in a first direction, and the first end plate and the second end plate are oppositely arranged at two ends of the shell in the first direction; a fixing hole is formed in at least one of the first end plate and the second end plate; the first terminal post is arranged on at least one of the first end plate and the second end plate, the first terminal post comprises a concave part and a turnup part connected to the periphery of an opening of the concave part, the turnup part extends outwards in the radial direction of the fixing hole, and the first terminal post penetrates through the fixing hole and is riveted with the first end plate or the second end plate through the turnup part. According to the battery monomer disclosed by the utility model, the weight of the first pole can be reduced, so that the overall weight of the battery monomer is reduced, the weight energy density of the battery monomer is further well improved, and the battery monomer can better meet the use requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery monomer, a battery and an electrical device having the same. Background Art

[0002] With the development of society, transportation has become more and more convenient, and people are traveling more and more frequently between various regions. People are paying more and more attention to the driving speed and range of transportation. Faster driving speed can reduce travel time, and longer range can reduce the number of stops and parking time, thereby saving travel time and making people's travel more convenient. In vehicles that use batteries as driving energy, the weight energy density of the battery has a more important impact on the vehicle's driving performance and endurance. Therefore, in the production design of the vehicle, there are certain regulations and requirements for the weight energy density of the battery. At present, for some traditional battery structures, the battery is heavy and the weight energy density is low, which is not easy to meet the needs of use. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery cell, which can improve the weight energy density and meet the use requirements.

[0004] The utility model also provides a battery having the battery monomer.

[0005] The utility model also provides an electrical device having the battery.

[0006] According to the first aspect of the utility model, the battery cell includes: a shell, the shell has a first end plate and a second end plate arranged opposite to each other in a first direction, the first end plate and the second end plate are arranged opposite to each other at the two ends of the shell in the first direction, and at least one of the first end plate and the second end plate is formed with a fixing hole; a first pole, the first pole is arranged on at least one of the first end plate and the second end plate, the first pole includes a recess and a flange portion connected around the opening of the recess, the flange portion extends outward in the radial direction of the fixing hole, the first pole passes through the fixing hole and is riveted to the first end plate or the second end plate through the flange portion.

[0007] According to the battery of the utility model, by forming a recess on the first pole, the weight of the first pole can be reduced, thereby reducing the overall weight of the battery cell, and further greatly improving the weight energy density of the battery cell, so that the battery cell can better meet the needs of use.

[0008] In some embodiments of the utility model, the recess includes: a connecting cylinder portion, which is inserted into the fixing hole and extends in a ring shape along the circumference of the fixing hole, the flange portion is located on the outside of the shell and is connected to one end of the connecting cylinder portion in the axial direction, the flange portion extends radially outward along the connecting cylinder portion and extends in a ring shape along the circumference of the connecting cylinder portion; a connecting plate portion, which is arranged in the shell and covers the other end of the connecting cylinder portion in the axial direction; wherein, in a projection plane perpendicular to the first direction, the distance between the outer peripheral edge of the flange portion and the central axis of the fixing hole is greater than the radius of the fixing hole, the distance between the peripheral edge of the connecting plate portion and the central axis of the fixing hole is greater than the radius of the fixing hole, and the first end plate or the second end plate is clamped between the flange portion and the connecting plate portion.

[0009] In this embodiment, a connecting plate portion and a connecting tube portion cooperate to form a recessed portion of the first pole, which has a simple structure and is easy to process and manufacture. The connecting plate portion and the flange portion cooperate to form a clamping and fixing structure for the first end plate or the second end plate, so that the first pole and the first end plate or the second end plate are assembled and fixed more firmly and reliably.

[0010] In some embodiments of the present invention, the recess is provided with an injection hole, which passes through the bottom wall of the recess, and the battery cell further includes a sealing member, at least a portion of which is disposed in the injection hole to seal the injection hole.

[0011] In this embodiment, a liquid injection hole is provided on the bottom wall of the recessed portion, so as to facilitate the injection of liquid into the accommodating cavity during the production of the battery cell. A sealing member is provided to seal the liquid injection hole, which can effectively seal the accommodating cavity and reduce the possibility of electrolyte leakage from the liquid injection hole, thereby making the battery cell more reliable and stable to use.

[0012] In some examples of the present invention, the battery cell further includes: a sealing member, which is disposed at an opening position of the recess and seals the opening of the recess.

[0013] In this embodiment, a seal is provided to seal the opening of the recess, so as to further improve the sealing performance of the first end plate and the first pole after assembly, so that a more reliable and stable accommodating cavity space is formed in the shell of the battery cell, and the possibility of leakage of electrolyte from the injection hole and the opening of the recess after injection is better reduced, so that the use of the battery cell is more stable and reliable.

[0014] In an example of the present invention, a groove is provided on the periphery of the opening of the recess, the groove passes through the inner peripheral surface of the recess, and the sealing member is provided with a supporting portion, which is fitted in the groove.

[0015] In this embodiment, a groove is provided on the periphery of the opening of the recessed portion to cooperate and fix with the supporting portion of the seal. The structure is simple, and the seal can be conveniently arranged in place when the seal is assembled with the first pole, thereby making it easier to connect and fix the seal with the first pole.

[0016] In some specific embodiments of the present invention, in a direction from the housing toward the first pole, a side wall of the groove is formed as an inclined surface that gradually extends away from a central axis of the fixing hole.

[0017] In this embodiment, the side wall of the groove is set as an inclined surface, and the inclined surface extends obliquely gradually away from the central axis of the fixing hole in the direction from the shell toward the first pole, which can play a good guiding role. When the seal is assembled with the first pole, the support part can easily fall into the groove along the inclined surface, thereby making the assembly and fixation of the seal with the first pole more convenient and quick.

[0018] In some embodiments of the utility model, the battery cell also includes an electrode assembly, the electrode assembly is disposed in the shell, and the first pole is electrically connected to the electrode assembly, wherein the first pole is directly connected to the electrode assembly, or the first pole is connected to the electrode assembly through a first adapter.

[0019] In this embodiment, the first pole can be directly connected to the electrode assembly, which can reduce the setting of the intermediate parts, thereby further reducing the weight of the battery cell, and further improving the weight energy density of the battery cell, so that the battery cell can better meet the usage requirements; the first pole is connected to the electrode assembly through the first adapter, so that the first pole can be more conveniently and reliably electrically connected to multiple positive pole ears or multiple negative pole ears through the first adapter, making the processing and manufacturing of the battery cell more convenient and easy.

[0020] In some embodiments of the present invention, the first pole is disposed on both the first end plate and the second end plate.

[0021] In this embodiment, the first pole is arranged on the first end plate and the second end plate, so that a recess is formed on the pole of the battery cell, thereby better reducing the weight energy density of the battery cell and enabling the battery cell to better meet usage requirements.

[0022] In some embodiments of the present invention, the first end plate is provided with the first pole, and the battery cell further includes: a second pole, the second pole is provided on the second end plate, and the structure of the second pole is different from that of the first pole.

[0023] In this embodiment, the structure of the second pole is set to be different from that of the first pole, which can better meet the design requirements of the battery cell and the different uses of the first pole and the second pole in the battery cell.

[0024] In one embodiment of the present invention, the second pole includes a pole body and a rivet block, the rivet block is arranged on a side of the second end plate away from the shell, the second end plate is provided with a lead-out hole, the pole body passes through the lead-out hole and is riveted to the second end plate through the rivet block.

[0025] In this embodiment, the second pole includes a pole body and a rivet block, and a lead-out hole is provided on the second end plate, so that the assembly and fixation of the pole body, the rivet block and the second end plate are relatively convenient and easy. The rivet block can make the second pole have a larger connection area when connected to an electrical connector such as a bus bar, making it more convenient to assemble and connect the battery cell.

[0026] In some examples of the utility model, two lead-out holes are arranged at intervals on the second end plate, the number of the pole bodies is two, the two pole bodies are respectively penetrated through the two lead-out holes, and the two ends of the rivet block are respectively connected to the two pole bodies.

[0027] In this embodiment, two pole bodies are arranged in the second pole, which can increase the flow area of ​​the second pole, so that the second pole can better meet the flow requirements of the battery cell during use, has a simple structure and good flow guiding effect.

[0028] In some examples of the present invention, the pole body is directly connected to the electrode assembly of the battery cell, or the pole body is connected to the electrode assembly of the battery cell via a second adapter.

[0029] In this embodiment, the pole body is directly connected to the electrode assembly, so that the second pole in the battery cell can occupy a smaller accommodating cavity space when connected to the electrode assembly, thereby increasing the layout space of the electrode assembly to a certain extent, so that the energy density of the battery cell can be greatly improved, so that the battery cell can better meet the needs of use; the pole body is connected to the electrode assembly through the second adapter, so that multiple pole ears can be easily and reliably stably electrically connected to the pole body, so that the second pole and the electrode assembly are more convenient and easy to connect.

[0030] In some embodiments of the present invention, the shell further includes a main shell, which defines a accommodating cavity, both ends of which are open in the first direction, and the first end plate and the second end plate respectively cover the two ends of the main shell in the first direction.

[0031] This embodiment has a simple structure by setting the main shell to be open at both ends, which can facilitate the assembly of structures such as the electrode assembly of the battery cell in the accommodating cavity, making the processing and manufacturing of the battery cell more convenient and efficient.

[0032] In some embodiments of the present invention, the battery cell is a cylindrical battery cell.

[0033] In this embodiment, the battery cell adopts a cylindrical battery cell, which has a long service life, good overcharge resistance and high temperature resistance, mature production technology, and is widely used.

[0034] A battery according to a second aspect of the present invention comprises a battery cell according to the first aspect of the present invention.

[0035] According to the battery of the utility model, by setting the battery cell of the first aspect mentioned above, the battery cell forms a recess on the first pole, so that the weight of the first pole can be reduced, thereby reducing the overall weight of the battery cell, and further greatly improving the weight energy density of the battery cell, so that the battery cell can better meet the needs of use.

[0036] The electrical equipment according to the third aspect of the utility model comprises the battery according to the second aspect of the utility model.

[0037] According to the electrical equipment of the utility model, by setting the battery of the second aspect mentioned above and forming a recess on the first pole, the weight of the first pole can be reduced, thereby reducing the overall weight of the battery cell, and further greatly improving the weight energy density of the battery cell, so that the battery cell can better meet the needs of use.

[0038] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic diagram of an electrical device according to an embodiment of the utility model;

[0040] Figure 2 is an exploded view of a battery cell according to an embodiment of the utility model;

[0041] Figure 3 is a schematic diagram of a battery cell according to an embodiment of the utility model;

[0042] Figure 4 yes Figure 3 A schematic diagram of the cross section at AA shown in FIG.

[0043] Figure 5 yes Figure 4A schematic diagram of a partial enlargement of point B shown in FIG.

[0044] Figure 6 is a schematic diagram of a battery cell according to another embodiment of the utility model;

[0045] Figure 7 yes Figure 6 A schematic diagram of the cross section at CC shown in ;

[0046] Figure 8 yes Figure 7 A locally enlarged schematic diagram of point D shown in FIG.

[0047] Reference numerals:

[0048] 100. Battery cell;

[0049] 10. Shell; 101. Accommodating cavity; 20. First end plate; 30. First pole; 31. Flanged portion; 32. Concave portion; 321. Connecting tube portion; 322. Connecting plate portion; 301. Liquid injection hole; 40. Second end plate; 50. Second pole; 51. Pole body; 52. Riveting block; 60. Electrode assembly;

[0050] 71. Sealing member; 711. Supporting part; 72. Blocking member; 73. Upper plastic member; 731. First insulating member; 732. Second insulating member; 733. Position-limiting insulating member; 74. Sealing ring; 75. Lower plastic member; 76. First adapter; 77. Second adapter;

[0051] 1000, battery; 2000, controller; 3000, motor;

[0052] 10000. Electrical equipment. DETAILED DESCRIPTION

[0053] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by technicians in the technical field to which the present invention belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" in the specification and claims of the present invention and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0055] In the description of the embodiments of the present utility model, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present utility model, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0056] Reference to "embodiments" herein 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 invention. 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 herein may be combined with other embodiments.

[0057] In the description of the embodiments of the present invention, the term "plurality" refers to more than two (including two).

[0058] In the description of the embodiments of the present utility model, the orientations or positional relationships indicated by technical terms such as "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present utility model and simplifying the description. They do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present utility model.

[0059] In the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0060] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0061] The battery cell structure is a pole formed by riveting the end covers at both ends of the battery cell. The pole structure is heavy, which makes the weight energy density of the battery cell low. For some electrical equipment that requires a higher weight energy density of the battery cell, it is difficult to meet the requirements.

[0062] Based on the above considerations, in order to improve the weight energy density of the battery cell so that the battery cell can better meet the needs of use, the utility model designs a battery cell. By setting the poles at one end or both ends of the battery cell to a hollow structure, the weight of the battery cell is reduced, thereby greatly improving the weight energy density of the battery cell, so that the battery cell can better meet the needs of use.

[0063] The battery cell disclosed in the embodiment of the utility model can be used in electrical equipment that uses the battery as a power source, or various energy storage systems that use the battery as an energy storage element. The electrical equipment may be, but is not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, the electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. The electric tools may 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, etc. The spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0064] For the convenience of description, the following embodiments are described by taking an electrical device 10000 of an embodiment of the utility model as a vehicle as an example.

[0065] refer to Figure 1 As shown, Figure 1 It is a schematic diagram of an electric device 10000 according to an embodiment of the utility model. The vehicle 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, etc. A battery 1000 is arranged inside the vehicle, and the battery 1000 can be arranged at the bottom, head or tail of the vehicle. The battery 1000 can be used to power the vehicle. For example, the battery 1000 can be used as an operating power source for the vehicle. The vehicle can also include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery 1000 to power the motor 3000, for example, for the starting, navigation and working power requirements of the vehicle during driving.

[0066] In some embodiments of the present invention, the battery 1000 can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0067] In this embodiment, the battery 1000 can be composed of a plurality of battery cells 100 arranged in groups to form a module or a battery pack to provide a higher voltage and capacity to the electrical device 1000 to meet different power usage requirements.

[0068] The battery 1000 may include a case, which may be used to accommodate a plurality of battery cells. The interior of the case of the present embodiment may be a hollow structure, and a plurality of battery cells are accommodated in the case. The case may include a first case and a second case, which are buckled together to form a hollow structure. The shapes of the first case and the second case may be determined according to the shapes of the components accommodated therein, for example, according to the shapes of the combination of multiple battery cells accommodated therein. At least one of the first case and the second case has an opening. For example, only one of the first case and the second case may be a hollow cuboid with an opening, while the other may be plate-shaped and cover the opening, or both the first case and the second case may form a hollow cuboid with an opening.

[0069] Reference below Figure 2-Figure 8 A battery cell 100 according to an embodiment of the first aspect of the present invention is described. Figure 2 is an exploded view of a battery cell 100 according to an embodiment of the present utility model; Figure 3 is a schematic diagram of a battery cell 100 according to an embodiment of the present utility model; Figure 4 yes Figure 3 A schematic diagram of the cross section at AA shown in FIG. Figure 5 yes Figure 4 A schematic diagram of a partial enlargement of point B shown in FIG. Figure 6 is a schematic diagram of a battery cell 100 according to another embodiment of the present utility model; Figure 7 yes Figure 6 A schematic diagram of the cross section at CC shown in ; Figure 8 yes Figure 7 A locally enlarged schematic diagram of point D shown in FIG.

[0070] like Figure 2-Figure 5 As shown, the battery cell 100 according to the first embodiment of the utility model comprises: a housing 10 and a first pole 30. The housing 10 has a first direction (eg Figure 2The first end plate 20 and the second end plate 40 are relatively arranged in the up and down direction (as shown in the figure), the first end plate 20 and the second end plate 40 are relatively arranged at the two ends of the shell 10 in the first direction, and at least one of the first end plate 20 and the second end plate 40 is formed with a fixing hole; the first pole 30 is provided on at least one of the first end plate 20 and the second end plate 40, the first pole 30 includes a recess 32 and a flange portion 31 connected around the opening of the recess 32, the flange portion 31 extends outwardly along the radial direction of the fixing hole, the first pole 30 passes through the fixing hole and is riveted to the first end plate 20 or the second end plate 40 through the flange portion 31.

[0071] In this embodiment, the shell 10 can be in various shapes and sizes, for example, the shell 10 can be cylindrical, quadrangular, etc. The material of the shell 10 can be conductive metal or non-conductive non-metal, for example, the material of the shell 10 can be steel, iron, aluminum, alloy, composite material, plastic, etc. The shell 10 protects the electrode assembly 60 in the battery cell 100. Specifically, when the battery cell 100 is assembled, the electrode assembly 60 and the electrolyte are arranged in the accommodating cavity 101 of the shell 10. The shell 10 can provide a certain degree of defense against external friction and impact, and better isolate the external environment from the electrode assembly 60.

[0072] In this embodiment, the housing 10 has a first end plate 20 and a second end plate 40 arranged opposite to each other in a first direction. The housing 10 can be integrally formed with the first end plate 20, or the housing 10 can be integrally formed with the second end plate 40, or the housing 10 can be separately provided with the first end plate 20 and the second end plate 40. The housing 10 and the first end plate 20 and the second end plate 40 can cooperate to form a closed accommodation cavity 101 to facilitate the assembly of other components in the battery cell 100, for example, the electrode assembly 60 of the battery cell 100 can be provided in the accommodation cavity 101.

[0073] The shape of the first end plate 20 can be adapted to the shape of the housing 10 so as to be well matched with the housing 10. The material of the first end plate 20 can be steel, iron, aluminum, alloy, etc. Similarly, the shape of the second end plate 40 can be adapted to the shape of the housing 10 so as to be well matched with the housing 10. The material of the second end plate 40 can be steel, iron, aluminum, alloy, etc. The shape of the first pole 30 can also be cylindrical, polygonal, etc. The shape of the first pole 30 can be set according to actual processing and use needs, and no specific limitation is made here.

[0074] In this embodiment, the first pole 30 is arranged on at least one of the first end plate 20 and the second end plate 40. The first pole 30 can be arranged only on the first end plate 20, the first pole 30 can also be arranged only on the second end plate 40, or the first pole 30 can also be arranged on the first end plate 20 and the second end plate 40. When the first pole 30 is arranged on both the first end plate 20 and the second end plate 40, one of the first poles 30 is a positive pole and the other is a negative pole.

[0075] It can be understood that the battery cell 100 requires at least one positive electrode column and one negative electrode column. In this embodiment, the first electrode column 30 includes a recess 32. When the first electrode column 30 is only arranged on the first end plate 20 or only arranged on the second end plate 40, at least one of the two electrodes of the battery cell 100 has the recess 32. When the first electrode column 30 is arranged on the first end plate 20 and the second end plate 40, both electrodes of the battery cell 100 have the recess 32.

[0076] In this embodiment, at least one of the first end plate 20 and the second end plate 40 is formed with a fixing hole, that is, the first end plate 20 may be provided with a fixing hole while the second end plate 40 is not provided with a fixing hole, or the first end plate 20 is not provided with a fixing hole while the second end plate 40 is provided with a fixing hole, or both the first end plate 20 and the second end plate 40 are provided with a fixing hole.

[0077] The recess 32 can be formed into a cavity structure with a cross-section in the form of a circular hole, a square hole, a waist-shaped hole, etc. The shape of the recess 32 can be adaptively set according to the shape of the first pole 30. The recess 32 can be formed as a blind hole, or the recess 32 can be formed as a through hole. When the first pole 30 is arranged on the first end plate 20, the first pole 30 is riveted and fixed to the first end plate 20. When the first pole 30 is arranged on the second end plate 40, the first pole 30 is riveted and fixed to the second end plate 40. For example, when the first pole 30 is riveted and fixed to the first end plate 20, the flange portion 31 of the first pole 30 can be pressed against the first end plate 20 toward a side surface of the first end plate 20 in the first direction. When the battery cell 100 is processed and manufactured, the flange portion 31 of the first pole 30 can be formed by riveting and riveted to the first end plate 20 or the second end plate 40, so that the first pole 30 and the shell 10 can be riveted and fixed.

[0078] In this embodiment, the first pole 30 is used to electrically connect with the electrode assembly 60 in the accommodating cavity 101, so that the battery cell 100 can be conveniently electrically connected with external electrical equipment, other battery cells 100 or power sources. The first end plate 20 and the second end plate 40 cooperate with the shell 10 to form the accommodating cavity 101, which can play a good role in isolating and protecting the electrode assembly 60 in the accommodating cavity 101. The first end plate 20, the second end plate 40 cooperate with the shell 10 to play a better protective effect on the electrode assembly 60.

[0079] In this embodiment, a fixing hole is provided on at least one of the first end plate 20 and the second end plate 40, which can facilitate the fixing of the first pole 30 to the first end plate 20 or the first pole 30 to the second end plate 40. The flange portion 31 of the first pole 30 extends outward along the fixed radial direction, so that the flange portion 31 and the plate surface of the first end plate 20 or the second end plate 40 have a good contact and crimping area, so that the first pole 30 and the first end plate 20 or the second end plate 40 are more firmly and reliably connected when riveted.

[0080] It is understandable that the weight of the vehicle has a relatively important influence on the vehicle's load capacity, acceleration, energy consumption and other indicators. The weight energy density of the battery cell 100 refers to the size of the electrical capacity per unit weight of the battery cell 100. The higher the weight energy density of the battery cell 100, the greater the electrical energy stored in the battery cell 100 under the same weight requirement, thereby enabling the vehicle to increase the load, reduce energy consumption and other indicators while maintaining good endurance, so as to meet the vehicle's usage requirements.

[0081] According to the battery cell 100 of the embodiment of the utility model, by forming the recess 32 on the first pole 30, the weight of the first pole 30 can be reduced, thereby reducing the overall weight of the battery cell 100, and further greatly improving the weight energy density of the battery cell 100, so that the battery cell 100 can better meet the needs of use.

[0082] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, the recess 32 may include: a connecting cylinder portion 321 and a connecting plate portion 322, the connecting cylinder portion 321 is inserted into the fixing hole and extends in a ring shape along the circumference of the fixing hole, the flange portion 31 is located on the outside of the shell 10 and is connected to one end of the connecting cylinder portion 321 in the axial direction, the flange portion 31 extends radially outward of the connecting cylinder portion 321 and extends in a ring shape along the circumference of the connecting cylinder portion 321; the connecting plate portion 322 is arranged in the shell 10 and is sealed at the other end of the connecting cylinder portion 321 in the axial direction.

[0083] Among them, in the projection plane perpendicular to the first direction, the distance between the outer edge of the flange portion 31 and the central axis of the fixing hole is greater than the radius of the fixing hole, the distance between the outer edge of the connecting plate portion 322 and the central axis of the fixing hole is greater than the radius of the fixing hole, and the first end plate 20 or the second end plate 40 is clamped between the flange portion 31 and the connecting plate portion 322.

[0084] In this embodiment, the flange portion 31 and one end of the connecting cylinder portion 321 and extend in a ring shape along the circumference of the connecting cylinder portion 321. When the first pole 30 is manufactured, the flange portion 31 can be formed by bending outwards at one end of the connecting cylinder portion 321 away from the accommodating cavity 101 during riveting. The connecting cylinder portion 321 extends in a ring shape along the circumference of the fixing hole, and a cavity is formed inside the connecting cylinder portion 321. The connecting plate portion 322 is sealed on one end of the connecting cylinder, so that the connecting cylinder portion 321 and the connecting plate portion 322 cooperate to form the concave portion 32 of the first pole 30 and form a cavity.

[0085] The shape of the connecting plate portion 322 can match the shape of the housing 10. For example, when the housing 10 is a cylinder, the connecting plate portion 322 can be formed as a circular plate, and when the housing 10 is a rectangular parallelepiped housing 10, the connecting plate portion 322 can be formed as a rectangular plate. The thickness of the connecting plate portion 322 can be the same as the wall thickness of the connecting cylinder portion 321 or less than the thickness of the connecting cylinder wall. The connecting plate portion 322 is used to electrically connect to the electrode assembly 60 of the battery cell 100. The thickness of the connecting plate portion 322 can be reasonably set according to the use requirements.

[0086] like Figure 5 As shown in the figure, straight line l represents the central axis of the fixing hole, r1 represents the radius of the fixing hole, r2 represents the distance between the outer peripheral edge of the flange portion 31 and the central axis l, and r3 represents the distance between the outer peripheral edge of the connecting plate portion 322 and the central axis l. It can be seen from the figure that r2 is greater than r1, and r3 is also greater than r1.

[0087] In this embodiment, the distance between the outer periphery of the flange portion 31 and the central axis of the fixing hole is greater than the radius of the fixing hole, and the distance between the periphery of the connecting plate portion 322 and the central axis of the fixing hole is set to be greater than the radius of the fixing hole. When the first pole 30 is assembled and riveted with the first end plate 20 or the second end plate 40, the flange portion 31 can form a good riveted fixing surface with the one side surface of the first end plate 20 or the second end plate 40 in the first direction in the radial direction of the fixing hole, and the connecting plate portion 322 can also form a good riveted fixing surface with the other side surface of the first end plate 20 or the second end plate 40 in the first direction.

[0088] In this embodiment, a connecting plate portion 322 cooperates with a connecting tube portion 321 to form a recessed portion 32 of the first pole 30, which has a simple structure and is easy to manufacture. The connecting plate portion 322 cooperates with the flange portion 31 to form a clamping and fixing structure for the first end plate 20 or the second end plate 40, so that the first pole 30 is more firmly and reliably assembled and fixed to the first end plate 20 or the second end plate 40.

[0089] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, the recess 32 may be provided with a liquid injection hole 301 , which passes through the bottom wall of the recess 32 . The battery cell 100 further includes a blocking member 72 , at least part of which is disposed in the liquid injection hole 301 to block the liquid injection hole 301 .

[0090] When injecting liquid into the accommodating cavity 101 of the battery cell 100, the electrolyte can be injected into the accommodating cavity 101 from the injection hole 301. After the injection is completed, the sealing member 72 seals the injection hole 301. The shape and size of the injection hole 301 can be various. For example, the injection hole 301 can be a round hole, a square hole, a waist-shaped hole, etc. The size of the injection hole 301 can be reasonably set according to the injection needs, and the number of injection holes 301 can be one or more. The shape and size of the sealing member 72 can be adaptively set according to the shape and size of the injection hole 301 and the sealing needs. The sealing member 72 can be a rubber member, a plastic member, etc. At least part of the sealing member 72 is arranged in the injection hole 301, that is, the sealing member 72 can be partially or completely arranged in the injection hole 301.

[0091] In this embodiment, a liquid injection hole 301 is provided on the bottom wall of the recess 32, so as to facilitate the injection of liquid into the accommodating cavity 101 during the production of the battery cell 100. The sealing member 72 is provided to seal the liquid injection hole 301, which can effectively seal the accommodating cavity 101 and reduce the possibility of leakage of electrolyte from the liquid injection hole 301, so that the battery cell 100 can be used more reliably and stably.

[0092] In one embodiment of the present invention, Figure 4 and Figure 5 As shown, the battery cell may further include an upper plastic part 73 , which is disposed between the outer peripheral wall of the first pole 30 and the fixing hole and between the flange portion of the first pole 30 and the first end plate 20 .

[0093] Specifically, Figure 5As shown, the upper plastic part 73 may include a first insulating portion 731, a second insulating portion 732 and a limiting insulating portion 733. The first insulating portion 731 is arranged in the fixing hole, and the first insulating portion 731 extends along the axis of the fixing hole and extends in a ring shape along the circumference of the fixing hole. The second insulating portion 732 is arranged on a side surface of the first end plate 20 that is away from the accommodating cavity 101. The second insulating portion 732 is connected to one end of the first insulating portion 731 and extends radially outward along the fixing hole. The limiting insulating portion 733 is connected to the radial outer end of the second insulating portion 732 and extends away from the first insulating portion 731 along the axial direction of the fixing hole. The limiting insulating portion 733 extends in a ring shape along the circumference of the fixing hole.

[0094] like Figure 5 As shown, the second insulating portion 732 cooperates with the limiting insulating portion 733 to define a limiting groove. When the first pole 30 is riveted to the first end plate 20, the first pole 30 abuts against the first insulating portion 731, and the end of the first pole 30 that is away from the accommodating cavity 101 is pressed toward the first end plate 20 to form a flange portion 31. The flange portion 31 cooperates to be limited in the limiting groove and abuts against the second insulating portion 732 and the limiting insulating portion 733. After the first pole 30 is riveted to the first end plate 20, the upper plastic part 73 is filled between the first pole 30 and the first end plate 20.

[0095] By providing the upper plastic part 73, this embodiment can play a good role in isolation and sealing the assembly of the first pole 30 and the first end plate 20, so that the riveting of the first pole 30 and the first end plate 20 is more firm and reliable, so that after the first end plate 20, the first pole 30 and the shell 10 are assembled, the electrolyte in the accommodating cavity 101 is not easy to leak from the gap between the first pole 30 and the first end plate 20, thereby improving the sealing effect of the battery cell accommodating cavity 101.

[0096] In this embodiment, the upper plastic part 73 is explained by taking the first pole 30 provided on the first end plate 20 as an example. When the first pole 30 is provided on the second end plate 40, the upper plastic part 73 can be provided between the outer peripheral wall of the first pole 30 and the fixing hole and between the flange portion 31 of the first pole 30 and the second end plate 40. The assembly relationship between the upper plastic part 73 and the second end plate 40 and the first pole 30 is the same as the assembly relationship between the upper plastic part 73 and the first end plate 20 and the first pole 30, and will not be repeated here.

[0097] Furthermore, the upper plastic part 73 may be an insulating part.

[0098] For example, the upper plastic part 73 may be in the form of a sealing pad, a sealing ring, etc. having an insulating effect, and the material of the upper plastic part 73 may be rubber, plastic, etc.

[0099] In this embodiment, the upper plastic part 73 is set as an insulating part, which can play a good insulating role between the first pole 30 and the first end plate 20 or the first pole 30 and the second end plate 20, so that the short circuit in the battery cell 100 is further reduced, and the battery cell 100 is more stable and reliable during use.

[0100] In one embodiment of the present invention, Figure 4 and Figure 5 As shown, the battery cell 100 may further include a sealing ring 74 , which extends in a ring shape along the circumference of the first pole 30 , is sleeved on the first pole 30 , and is sealed between a side surface of the first end plate 20 facing the accommodating cavity 101 and the first pole 30 .

[0101] The shape and size of the sealing ring 74 can be reasonably set as needed. When the first pole 30 and the first end plate 20 are riveted and assembled, the end of the first pole 30 facing the accommodating cavity 101 is pressed toward the first end plate 20, and the sealing ring 74 is located between the first end plate 20 and the first pole 30 to isolate the first end plate 20 from the first pole 30.

[0102] In this embodiment, the sealing ring 74 can cooperate with the plastic part 73 to form a complete and reliable isolation and seal between the first pole 30 and the first end plate 20, further reducing the possibility of leakage of the battery cell 100, making the battery cell 100 more stable and reliable to use. In this embodiment, the sealing ring 74 is described by taking the first pole 30 as being arranged on the first end plate 20. When the first pole 30 is arranged on the second end plate 40, the matching relationship between the sealing ring 74 and the second end plate 40 and the first pole 30 is the same as the matching relationship between the sealing ring 74 and the first end plate 20 and the first pole 30, and the description is not repeated here.

[0103] In some examples of the present invention, Figure 2-Figure 8 As shown, the battery cell 100 may further include a sealing member 71 , which is disposed at the opening of the recess 32 and seals the opening of the recess 32 .

[0104] The shape and size of the sealing member 71 can be adaptively set according to the shape and size of the opening of the recess 32 and actual needs. The sealing member 71 can be a metal member, and the sealing member 71 and the first pole 30 can be connected by welding. After the injection is completed, the sealing member 72 blocks the injection hole 301, and the sealing member 71 seals the opening of the recess 32.

[0105] In this embodiment, a seal 71 is provided to seal the opening of the recess 32, so as to further improve the sealing performance of the first end plate 20 and the first pole 30 after assembly, so that a more reliable and stable accommodating cavity 101 space is formed in the shell 10 of the battery cell 100, and the possibility of leakage of the electrolyte from the injection hole 301 and the opening of the recess 32 after injection is better reduced, so that the battery cell 100 is more stable and reliable to use.

[0106] In one example of the present invention, Figure 5 As shown, a groove may be provided at the periphery of the opening of the recess 32 , and the groove passes through the inner circumference of the recess 32 . The sealing member 71 is provided with a supporting portion 711 , and the supporting portion 711 is fitted in the groove.

[0107] The depth of the groove may be less than the thickness of the flange portion 31 so that the recess 32 of the first pole 30 and the flange portion 31 maintain good structural strength, and the groove may extend as an annular groove along the circumference of the recess 32, or may be a plurality of grooves arranged at intervals along the circumference of the recess 32. The support portion 711 may be adapted to the shape of the groove bottom and the circumferential side surface of the groove.

[0108] In this embodiment, a groove is provided around the opening of the recess 32 to cooperate and fix with the support portion 711 of the seal 71. The structure is simple, and the seal 71 can be easily arranged in place when the seal 71 is assembled with the first pole 30, so that the seal 71 is easily connected and fixed to the first pole 30.

[0109] In some specific embodiments of the present invention, Figure 5 As shown, in the direction from the housing 10 toward the first pole 30 , the side wall of the groove may be formed as an inclined surface that gradually extends away from the central axis of the fixing hole.

[0110] The side wall of the groove is formed as an inclined surface, that is, in the direction from the shell 10 toward the first pole 30 downward, the width of the groove in the radial direction of the recess 32 gradually increases, that is, the opening of the groove on the side away from the shell 10 gradually increases, and when the support portion 711 of the seal 71 is assembled and fixed in the groove, the peripheral side surface of the support portion 711 that abuts against the inclined surface of the groove slides toward the shell 10 along the inclined surface, and the inclined surface limits the support portion 711 and fixes it.

[0111] In this embodiment, the side wall of the groove is set as an inclined surface, and the inclined surface extends obliquely gradually away from the central axis of the fixing hole in the direction from the shell 10 toward the first pole 30, which can play a good guiding role. When the seal 71 is assembled with the first pole 30, the support portion 711 can easily fall into the groove along the inclined surface, thereby making the assembly and fixation of the seal 71 and the first pole 30 more convenient and quick.

[0112] In some specific embodiments of the present invention, the sealing member 71 may be a metal member, and the sealing member 71 may be welded to the first pole 30 .

[0113] For example, the seal 71 may be made of steel, iron, aluminum or alloy, etc. When the battery cell 100 is assembled, the support portion 711 of the seal 71 is welded and fixed to the first pole 30 at the opening of the groove.

[0114] like Figure 5 As shown, the support portion 711 may be a boss, which extends in a ring shape along the circumference of the seal 71, and the outer circumferential surface of the boss extends obliquely from the outside to the inside in the direction from the first pole 30 to the electrode assembly 60. Here, from the outside to the inside refers to the direction from the radial outside of the boss toward the radial inside of the boss. When the seal 71 is welded to the first pole 30, the boss is fixed in cooperation with the groove.

[0115] In this embodiment, the sealant 71 is set as a metal part, and the sealant 71 is welded to the first pole 30. This allows the sealant 71 to participate in the electrical connection as a conductive structure when the battery cell 100 is electrically connected to other battery cells 100 or electrical connection structures. Since the sealant 71 is sealed at the opening of the groove, the sealant 71 and the first pole 30 can cooperate to form a larger connection surface, thereby making the connection between the battery cell 100 and the external electrical connection structure more convenient and easy.

[0116] In some embodiments of the present invention, reference Figure 4 and Figure 7 As shown, the battery cell 100 may further include an electrode assembly 60 , which is disposed in the shell, and the first pole 30 is electrically connected to the electrode assembly 60 , wherein the first pole 30 is directly connected to the electrode assembly 60 , or the first pole 30 is connected to the electrode assembly 60 through a first adapter sheet 76 .

[0117] The electrode assembly 60 includes a cathode electrode plate, an anode electrode plate and a diaphragm. The cathode electrode plate and the anode electrode plate are separated by the diaphragm. Generally, the cathode electrode plate is a positive electrode plate, the anode electrode plate is a negative electrode plate, the positive electrode plate is provided with a positive electrode ear, and the negative electrode plate is provided with a negative electrode ear. In this embodiment, the first electrode column 30 is electrically connected to the electrode assembly 60, which means that the first electrode column 30 is electrically connected to the positive electrode ear or the first electrode column 30 is electrically connected to the negative electrode ear.

[0118] The first adapter plate 76 is a metal part with conductive function. For example, the material of the first adapter plate 76 can be steel, iron, aluminum or alloy, etc. The structural form of the first adapter plate 76 can be reasonably set according to the actual connection and layout needs. When the first pole 30 is electrically connected to the electrode assembly 60, the first adapter plate 76 is electrically connected to the positive pole ear or the negative pole ear of the electrode assembly 60, and the first pole 30 is then electrically connected to the first adapter plate 76.

[0119] In this embodiment, the first pole 30 can be directly connected to the electrode assembly 60, which can reduce the setting of the intermediate parts, thereby further reducing the weight of the battery cell 100, and further improving the weight energy density of the battery cell 100, so that the battery cell 100 can better meet the usage requirements.

[0120] It can be understood that, generally, there are multiple positive electrode tabs or negative electrode tabs in the electrode assembly 60. In this embodiment, the first electrode 30 is connected to the electrode assembly 60 via the first adapter plate 76, so that the first electrode 30 can be electrically connected to multiple positive electrode tabs or multiple negative electrode tabs more conveniently and reliably through the first adapter plate 76, making the processing and manufacturing of the battery cell 100 more convenient and easy.

[0121] In one embodiment of the present invention, Figure 5 As shown, a lower plastic part 75 may also be provided on one side of the first end plate 20 facing the accommodating cavity 101 , and the lower plastic part 75 is disposed between the electrode assembly 60 and the first end plate 20 .

[0122] For example, the lower plastic part 75 may be a rubber part, a silicone part, a plastic part, etc. The lower plastic part 75 is disposed between the electrode assembly 60 and the first end plate 20. Specifically, the lower plastic part 75 is disposed in the accommodating cavity 101, and the side of the lower plastic part 75 facing the first end plate 20 abuts against the first end plate 20, and the side of the lower plastic part 75 facing the electrode assembly 60 abuts against the electrode assembly 60.

[0123] In this embodiment, by setting the lower plastic part 75 between the first end plate 20 and the electrode assembly 60, it can support and fix the electrode assembly 60 in the accommodating cavity 101, and provide insulation protection for the electrode assembly 60 and the first end plate 20, thereby reducing the probability of short circuit in the battery cell 100 and making the battery cell 100 more stable and reliable during use.

[0124] In this embodiment, by setting the lower plastic part 75 between the second end plate 40 and the electrode assembly 60, it can support and fix the electrode assembly 60 in the accommodating cavity 101, and provide insulation protection for the electrode assembly 60 and the second end plate 40, thereby reducing the probability of short circuit in the battery cell 100 and making the battery cell 100 more stable and reliable during use.

[0125] In some embodiments of the present invention, reference Figure 4 As shown, the first end plate 20 and the second end plate 40 may both be provided with a first pole 30 .

[0126] The first pole 30 is provided on both the first end plate 20 and the second end plate 40, and the first end plate 20 and the first pole 30 can be riveted and fixed, and the second end plate 40 and the first pole 30 are riveted and fixed, and the first pole 30 on the first end plate 20 and the second end plate 40 are respectively formed as the positive pole and the negative pole of the battery cell 100, and the two poles of the battery cell 100 are provided with a recess 32.

[0127] In this embodiment, the first pole 30 is arranged on the first end plate 20 and the second end plate 40, so that a recess 32 is formed on the pole of the battery cell 100, thereby better reducing the weight energy density of the battery cell 100 and enabling the battery cell 100 to better meet usage requirements.

[0128] In some embodiments of the present invention, Figure 4 As shown, the first end plate 20 is provided with a first pole 30 , and the battery cell 100 may further include: a second pole 50 , which is provided on the second end plate 40 , and the structure of the second pole 50 is different from that of the first pole 30 .

[0129] The second pole 50 is used to be electrically connected to the electrode assembly 60 in the accommodating cavity 101. Specifically, when the first pole 30 is electrically connected to the positive pole tab of the electrode assembly 60, the second pole 50 can be electrically connected to the negative pole tab of the electrode assembly 60; when the first pole 30 is electrically connected to the negative pole tab of the electrode assembly 60, the second pole 50 can be electrically connected to the positive pole tab of the electrode assembly 60.

[0130] The shape of the second pole 50 can be cylindrical, polygonal, etc. The shape of the second pole 50 can be set as needed, and no specific limitation is made here. The shape of the second fixing hole can be suitable for the second pole 50. The second pole 50 is fixedly connected to the second end plate 40, for example, the second pole 50 can be riveted to the second end plate 40, the second pole 50 can also be bonded to the second end plate 40, the second pole 50 can also be welded to the second end plate 40, etc. The second pole 50 can be a metal part, for example, the material of the second pole 50 can be steel, iron, copper, alloy, etc.

[0131] In this embodiment, a second pole 50 is provided and the structure of the second pole 50 is different from that of the first pole 30. The difference in structure here may be that the first pole 30 and the second pole 50 are different in size and / or shape, or the structure of the first pole 30 outside the first end plate 20 is different from that of the second pole 50 outside the second end plate 40, or the structure of the first pole 30 inside the first end plate 20 and the shell 10 is different from that of the second pole 50 inside the second end plate 40 and the shell 10.

[0132] It is understandable that the battery cell 100 may also include other components, for example, a pressure relief structure, etc. The first pole 30 on the first end plate 20 and the second pole 50 on the second end plate 40 have different specific usage conditions in actual use, and based on considerations of processing efficiency, this embodiment sets the structure of the second pole 50 to be different from the structure of the first pole 30, which can better meet the design requirements of the battery cell 100 and the needs of different uses of the first pole 30 and the second pole 50 in the battery cell 100.

[0133] In one embodiment of the present invention, Figure 4 As shown, the second pole 50 may include a pole body 51 and a rivet block 52 . The rivet block 52 is arranged on a side of the second end plate 40 away from the shell 10 . The second end plate 40 is provided with a lead-out hole. The pole body 51 passes through the lead-out hole and is riveted to the second end plate 40 through the rivet block 52 .

[0134] refer to Figure 4 As shown, when the second pole 50 is assembled and fixed to the second end plate 40, the pole body 51 passes through the lead-out hole and is riveted and fixed to the rivet block 52. Specifically, an upper plastic part 73 and a sealing ring 74 can be provided between the pole body 51 and the second cover plate and between the rivet block 52 and the second cover plate for insulation isolation, and a lower plastic part 75 can be provided between the second cover plate and the electrode assembly 60 for insulation isolation.

[0135] In this embodiment, the second pole 50 includes a pole body 51 and a rivet block 52. A lead-out hole is provided on the second end plate 40, so that the assembly and fixation of the pole body 51, the rivet block 52 and the second end plate 40 are relatively convenient and easy. The rivet block 52 can make the second pole 50 have a larger connection area when connected to an electrical connector such as a bus bar, making it more convenient to assemble and connect the battery cell 100.

[0136] In some examples of the present invention, Figure 4 As shown, two lead-out holes may be arranged at intervals on the second end plate 40 , the number of the pole bodies 51 is two, the two pole bodies 51 are respectively penetrated through the two lead-out holes, and the two ends of the rivet block 52 are respectively connected to the two pole bodies 51 .

[0137] When the second pole 50 is assembled with the second end plate 40, a rivet block 52 is provided on the side of the second end plate 4040 away from the accommodating cavity 101, and the two second poles 50 are pressed toward the second end plate 40 at both ends in the first direction so that the second pole 50 is riveted and fixed to the second end plate 40 and the rivet block 52.

[0138] In this embodiment, two pole bodies 51 are arranged in the second pole 50, which can increase the flow area of ​​the second pole 50, so that the second pole 50 can better meet the flow requirements of the battery cell 100 during use, with a simple structure and good flow guiding effect.

[0139] In some examples of the present invention, reference Figure 4 As shown, the electrode body 51 may be directly connected to the electrode assembly 60 of the battery cell 100 .

[0140] When the second pole 50 is connected to the electrode assembly 60 , the side of the pole body 51 facing the electrode assembly 60 is welded to the pole lug of the electrode assembly 60 .

[0141] In this way, the second pole 50 in the battery cell can occupy a smaller space in the accommodating cavity 101 when connected to the electrode assembly 60, thereby increasing the layout space of the electrode assembly 60 to a certain extent, and greatly improving the energy density of the battery cell 100, so that the battery cell 100 can better meet the needs of use.

[0142] In some examples of the present invention, Figure 4 As shown, the pole body 51 can be connected to the electrode assembly 60 of the battery cell through the second adapter sheet 77 .

[0143] When the second pole 50 is connected to the electrode assembly 60 , the side of the pole body 51 facing the electrode assembly 60 is first connected to the second adapter plate 77 , and the second adapter plate 77 is then connected to the pole lug of the electrode assembly 60 .

[0144] It can be understood that there are multiple pole ears in the electrode assembly 60. In this embodiment, the second adapter plate 77 can easily and reliably connect the multiple pole ears stably and electrically to the pole body 51, thereby making it more convenient and easy to connect the second pole 50 to the electrode assembly 60.

[0145] In some embodiments of the present invention, the housing 10 may be an insulating member.

[0146] For example, the housing 10 may be a composite material with insulating properties, or the housing 10 may be a metal material with an insulating layer.

[0147] In this embodiment, the shell 10 is set as an insulating member to better reduce the short circuit between the electrode assembly 60 in the accommodating cavity 101 and the shell 10, so that the battery cell 100 can operate normally and stably during long-term use, thereby reducing the failure rate of the battery cell 100.

[0148] In some embodiments of the present invention, Figure 2As shown, the shell 10 may also include a main shell, which defines a receiving cavity 101, both ends of the receiving cavity 101 in the first direction are open, and the first end plate 20 and the second end plate 40 respectively cover the two ends of the main shell in the first direction.

[0149] The main shell is formed as a hollow structure with openings at both ends. When the battery cell 100 is assembled, the electrode assembly 60 of the battery cell 100 can be assembled into the accommodating cavity 101 from any end of the main shell, and the first end plate 20 and the second end plate 40 then cover the two end openings of the main shell, or one of the first end plate 20 and the second end plate 40 is first assembled with the main shell, and after the electrode assembly 60 is assembled into the accommodating cavity 101, the other of the first end plate 20 and the second end plate 40 then covers the accommodating cavity 101. In the actual processing process, the assembly order or assembly process of the first end plate 20, the second end plate 40 and the shell 10 of the battery cell 100 can be adjusted and set according to actual needs.

[0150] This embodiment has a simple structure by setting the main shell to be open at both ends, which can facilitate the assembly of the electrode assembly 60 and other structures of the battery cell 100 in the accommodating cavity 101, making the processing and manufacturing of the battery cell 100 more convenient and efficient.

[0151] In some embodiments of the present invention, the battery cell 100 may be a cylindrical battery cell.

[0152] Cylindrical battery cells are a type of battery cells formed by packaging an electrode assembly 60 in a cylindrical shell 10. Cylindrical battery cells can be divided into lithium iron phosphate battery cells, lithium cobalt oxide battery cells, lithium manganese oxide battery cells, cobalt-manganese hybrid battery cells, and the like.

[0153] In this embodiment, the battery cell 100 is a cylindrical battery cell, which has a long service life, good overcharge resistance and high temperature resistance, mature production technology, and is widely used.

[0154] Reference below Figure 2-Figure 8 A battery 1000 according to an embodiment of the second aspect of the present invention is described.

[0155] like Figure 2-Figure 8 As shown, a battery 1000 according to an embodiment of the present invention includes a battery cell 100 according to an embodiment of the first aspect of the present invention.

[0156] Other structures and operations of the battery according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0157] According to the battery 1000 of the embodiment of the utility model, by setting the battery cell 100 of the first embodiment mentioned above, the battery cell 100 forms a recess 32 on the first pole 30, so that the weight of the first pole 30 can be reduced, thereby reducing the overall weight of the battery cell 100, and further greatly improving the weight energy density of the battery cell 100, so that the battery cell 100 can better meet the needs of use.

[0158] Reference below Figure 1-Figure 8 An electric device 10000 according to an embodiment of the third aspect of the utility model is described.

[0159] like Figure 1-Figure 8 As shown, the electric device 10000 according to the embodiment of the utility model includes the battery 1000 according to the embodiment of the second aspect of the utility model.

[0160] Other structures and operations of the electrical device 10000 according to the embodiment of the utility model are known to ordinary technicians in the field and will not be described in detail here.

[0161] According to the electrical equipment 10000 of the embodiment of the utility model, by setting the battery 1000 of the above-mentioned second aspect embodiment and forming a recess 32 on the first pole 30, the weight of the first pole 30 can be reduced, thereby reducing the overall weight of the battery cell 100, and further greatly improving the weight energy density of the battery cell 100, so that the battery cell 100 can better meet the needs of use.

[0162] The following will refer to Figure 1-Figure 8 An electric device 10000 according to a specific embodiment of the utility model is described.

[0163] Embodiment 1,

[0164] like Figure 1-Figure 5As shown, the electric device 10000 is a vehicle, which includes a motor 3000, a controller 2000 and a battery 1000, and the controller 2000 is electrically connected to the motor 3000 and the battery 1000. The battery 1000 includes a plurality of battery cells 100. The battery cell 100 includes a housing 10, a first end plate 20, a first pole 30, a first adapter, a blocking member 72, a sealing member 71, a lower plastic member 75, a second end plate 40, a second pole 50, a second adapter 77 and an electrode assembly 60. The shell 10 is a metal part, and the shell 10 has a accommodating cavity 101. The electrode assembly 60 is arranged in the accommodating cavity 101. The accommodating cavity 101 is open at both ends in the up-down direction. The first end plate 20 is covered at the open end of the upper side of the shell 10, and the second end plate 40 is covered at the open end of the lower side of the shell 10; the first end plate 20 is provided with a fixing hole, and the first pole 30 has a connecting plate portion 322, a connecting cylinder portion 321 and a flange portion 31. The connecting cylinder portion 321 cooperates with the connecting plate portion 322 to form a recess 32. The first pole 30 is inserted into the fixing hole, and the connecting plate portion 322 of the first pole 30 is connected to the positive end of the electrode assembly 60 through the first adapter 76. The pole pieces are electrically connected to form the positive terminal of the battery cell 100. The first pole 30 and the first end plate 20 are riveted to form a flange portion 31. An upper plastic part 73 is arranged between the outer peripheral surface of the first pole 30 and the hole wall of the fixing hole and between the flange portion 31 and the upper surface of the first end plate 20. The upper plastic part 73 is a plastic part. A sealing ring 74 is arranged between the connecting plate portion 322 of the first pole 30 in the accommodating cavity 101 and the lower surface of the first end plate 20; the lower plastic part 75 is a plastic part, and the lower plastic part 75 is arranged between the electrode assembly 60 and the first end plate 20 and between the electrode assembly 60 and the second end plate 40; the first adapter sheet 76 is a metal part.

[0165] The connecting tube portion 321 of the first pole 30 cooperates with the connecting plate portion 322 to form a recess 32, which is formed as a blind hole with an opening facing upwards. The bottom wall of the first weight-reducing hole 301 is formed with a liquid injection hole 301; the plugging member 72 is a rubber member, and the plugging member 72 is blocked in the liquid injection hole 301; the sealing member 71 is a metal member, and the sealing member 71 is arranged at the opening of the first weight-reducing hole 301 and is welded to the first pole 30. The thickness of the sealing member 71 in the vertical direction can be greater than 1mm. In this embodiment, the thickness of the sealing member 71 is 2mm. The second pole 50 includes a pole body 51 and a rivet block 52. The pole body 51 is provided with two pole bodies. The two pole bodies 51 are penetrated on the second end plate 40 and are riveted to the rivet block 52 arranged at the second end plate 40. The second pole 50 is electrically connected to the negative pole piece of the electrode assembly 60 through the second adapter 77 to form the negative terminal of the battery cell 100.

[0166] According to the battery cell 100 of the embodiment of the utility model, the weight of the first pole 30 is reduced by forming a recess 32 on the first pole 30, thereby reducing the overall weight of the battery cell 100, thereby greatly improving the weight energy density of the battery cell 100, so that the battery cell 100 can better meet the needs of use.

[0167] Embodiment 2:

[0168] like Figure 6-Figure 8 As shown, the structure of this embodiment is substantially the same as that of the first embodiment, wherein the same components are marked with the same reference numerals, and the only difference is that in this embodiment, the first pole 30 is not electrically connected to the electrode assembly 60 via the first adapter sheet 76, but is directly electrically connected to the electrode assembly 60 via external welding, which can further reduce the weight of the battery cell 100 and further improve the weight energy density of the battery cell 100, so that the battery cell 100 can better meet and achieve the use requirements.

[0169] Embodiment 3,

[0170] refer to Figure 2-Figure 5 As shown, the structure of this embodiment is substantially the same as that of the first embodiment, and the only difference is that: in this embodiment, the riveted connection form between the second pole and the second end plate is set to be the same as the riveted connection form between the first pole 30 and the first end plate 20, that is, the first pole 30 in this embodiment is set on the second end plate 40, which can further reduce the weight of the battery cell 100, and further improve the weight energy density of the battery cell 100, so that the battery cell 100 can better meet and achieve the use needs.

[0171] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it; although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and description of the utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: A housing (10), the housing (10) comprising a first end plate (20) and a second end plate (40) arranged opposite to each other in a first direction, the first end plate (20) and the second end plate (40) being arranged opposite to each other at two ends of the housing (10) in the first direction, and at least one of the first end plate (20) and the second end plate (40) being formed with a fixing hole; A first pole (30), the first pole (30) being arranged on at least one of the first end plate (20) and the second end plate (40), the first pole (30) comprising a recess (32) and a flange portion (31) connected around an opening of the recess (32), the flange portion (31) extending radially outwardly along the fixing hole, the first pole (30) passing through the fixing hole and being riveted to the first end plate (20) or the second end plate (40) through the flange portion (31).

2. The battery cell according to claim 1, characterized in that: The recess (32) includes: a connecting cylinder (321), the connecting cylinder (321) being inserted into the fixing hole and extending in a ring shape along the circumference of the fixing hole, the flange portion (31) being located outside the housing (10) and connected to one end of the connecting cylinder (321) in the axial direction, the flange portion (31) extending outward in the radial direction of the connecting cylinder (321) and extending in a ring shape along the circumference of the connecting cylinder (321); A connecting plate portion (322), the connecting plate portion (322) being arranged in the housing (10) and sealing the other end of the connecting cylinder portion (321) in the axial direction; Among them, in the projection plane perpendicular to the first direction, the distance between the outer edge of the flange portion (31) and the central axis of the fixing hole is greater than the radius of the fixing hole, the distance between the outer edge of the connecting plate portion (322) and the central axis of the fixing hole is greater than the radius of the fixing hole, and the first end plate (20) or the second end plate (40) is clamped between the flange portion (31) and the connecting plate portion (322).

3. The battery cell according to claim 1, characterized in that: The recess (32) is provided with a liquid injection hole (301), and the liquid injection hole (301) passes through the bottom wall of the recess (32). The battery cell also includes a blocking piece (72), and at least a part of the blocking piece (72) is arranged in the liquid injection hole (301) to block the liquid injection hole (301).

4. The battery cell according to claim 3, characterized in that: The battery cell further comprises a sealing member (71), wherein the sealing member (71) is arranged at the opening position of the recess (32) and seals the opening of the recess (32).

5. The battery cell according to claim 4, characterized in that: A groove is provided at the periphery of the opening of the recess (32), and the groove passes through the inner peripheral surface of the recess (32). The sealing member (71) is provided with a support portion (711), and the support portion (711) is fitted in the groove.

6. The battery cell according to claim 5, characterized in that: In a direction from the housing (10) toward the first pole (30), a side wall of the groove is formed as an inclined surface that gradually extends away from the central axis of the fixing hole.

7. The battery cell according to claim 1, characterized in that: The battery cell further comprises an electrode assembly (60), wherein the electrode assembly (60) is disposed in the housing (10), and the first electrode column (30) is electrically connected to the electrode assembly (60). The first pole (30) is directly connected to the electrode assembly (60), or the first pole (30) is connected to the electrode assembly (60) via a first adapter sheet (76).

8. The battery cell according to any one of claims 1 to 7, characterized in that: The first pole (30) is provided on both the first end plate (20) and the second end plate (40).

9. The battery cell according to any one of claims 1 to 7, characterized in that: The first pole (30) is arranged on the first end plate (20), and the battery cell further comprises: a second pole (50), the second pole (50) is arranged on the second end plate (40), and the structure of the second pole (50) is different from that of the first pole (30).

10. The battery cell according to claim 9, characterized in that: The second pole (50) comprises a pole body (51) and a rivet block (52); the rivet block (52) is arranged on a side of the second end plate (40) away from the housing (10); the second end plate (40) is provided with a lead-out hole; the pole body (51) passes through the lead-out hole and is riveted to the second end plate (40) through the rivet block (52).

11. The battery cell according to claim 10, characterized in that: Two lead-out holes are arranged at intervals on the second end plate (40), the number of the pole bodies (51) is two, the two pole bodies (51) are respectively penetrated through the two lead-out holes, and the two ends of the rivet block (52) are respectively connected to the two pole bodies (51).

12. The battery cell according to claim 10, characterized in that: The pole body (51) is directly connected to the electrode assembly (60) of the battery cell, or, The pole body (51) is connected to the electrode assembly (60) of the battery cell via a second adapter sheet (77).

13. The battery cell according to claim 1, characterized in that: The shell (10) further comprises a main shell, wherein the main shell defines a receiving chamber (101), wherein both ends of the receiving chamber (101) in a first direction are open, and the first end plate (20) and the second end plate (40) respectively cover both ends of the main shell in the first direction.

14. The battery cell according to claim 1, characterized in that: The battery cell is a cylindrical battery cell.

15. A battery, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 14.

16. An electrical equipment, characterized in that: Comprising the battery cell according to claim 15 .

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