Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly and an elastic assembly, the electrode assembly is located in the shell, the electrode assembly comprises an electrode main body, a transition section and a tab, the electrode main body comprises two end faces which are oppositely arranged in the first direction, and the tab is connected to at least one of the two end faces through the transition section; the elastic assembly is arranged in the shell and comprises a first elastic body, and at least part of the first elastic body is connected between the tab and the transition section in an abutting mode. The first elastomer can reduce the risk of short circuit caused by insertion of the tab into the transition section, limit the position of the electrode main body, reduce damage to the tab due to movement of the electrode main body, and improve the reliability of the battery monomer.

Description

Technical Field

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

[0002] With the development of new energy technology, battery monomers are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] As the application range of batteries becomes wider and wider, the requirements for the reliability of battery cells are becoming increasingly stringent. However, the electrode components of current battery cells may have the risk of short circuits, and the reliability of battery cells still needs to be further improved. Utility Model Content

[0004] The present application provides a battery cell, a battery device and an electrical device, which can improve the reliability of the battery cell.

[0005] In the first aspect, the present application provides a battery cell, comprising: a shell, an electrode assembly and an elastic assembly; the electrode assembly is located in the shell, the electrode assembly includes an electrode body, a transition section and a pole ear, the electrode body includes two end surfaces arranged opposite to each other in a first direction, and the pole ear is connected to at least one of the two end surfaces through the transition section; the elastic assembly is arranged in the shell, the elastic assembly includes a first elastomer, and at least a portion of the first elastomer abuts between the pole ear and the transition section.

[0006] In this embodiment, at least part of the first elastic body abuts between the pole ear and the transition section, and the first elastic body can reduce the risk of short circuit caused by the pole ear inserted into the transition section, thereby improving the safety of the battery cell. In addition, the electrode body is located on the side of the transition section away from the pole ear, and the first elastic body is elastic. The first elastic body abuts between the pole ear and the transition section, thereby improving the expansion stress of the electrode body and limiting the position of the electrode body, thereby reducing the damage to the pole ear caused by the movement of the electrode body and improving the reliability of the battery cell.

[0007] According to an embodiment of the present application, the shell includes an opening in a first direction, and the battery cell also includes a top cover assembly, which covers the opening; the pole ear includes a first segment and a second segment connected to each other, the first segment extends along the first direction and is connected between the transition segment and the second segment, the second segment extends along the second direction and is used to connect the top cover assembly, and at least a portion of the first elastomer abuts between the second segment and the transition segment to reduce the risk of short circuit when the second segment is inserted into the transition segment.

[0008] According to the embodiment of the present application, the number of the first elastic bodies is two, and the two first elastic bodies are arranged on both sides of the first segment in the second direction, and at least part of one of the two first elastic bodies abuts between the second segment and the transition segment, and the other of the two first elastic bodies abuts at least part of the transition segment and the top cover assembly. The first elastic body reduces the risk of the second segment being inserted into the transition segment to form a short circuit, and the first elastic body can also reduce the movement range of the electrode body along the first direction. The two first elastic bodies are arranged on both sides of the first segment in the second direction to improve the uniformity of the first elastic body's limiting force on the electrode body and improve the reliability of the battery cell.

[0009] According to an embodiment of the present application, a portion of one of the two first elastomers abuts between the second segment and the transition segment, and the other portion abuts between the transition segment and the top cover assembly, and / or a portion of the other of the two first elastomers abuts between the second segment and the transition segment, and the other portion abuts between the transition segment and the top cover assembly. One of the two first elastomers reduces the risk of short circuit between the second segment and the transition segment and limits the activity space of the electrode body in the shell. The other of the two first elastomers can also reduce the risk of short circuit between the second segment and the transition segment and limit the activity space of the electrode body in the shell.

[0010] According to the embodiment of the present application, the tab protrudes from the first elastic body along the third direction, or the tab coincides with the edge of the first elastic body along the third direction, and the first direction, the second direction and the third direction are arranged to intersect each other. The tab does not extend beyond the edge of the tab along the third direction, thereby reducing the risk of the first elastic body squeezing the tab and the transition section along the third direction, and reducing the risk of the first elastic body damaging the tab and the transition section.

[0011] According to an embodiment of the present application, the electrode ear includes a positive electrode ear and a negative electrode ear, the positive electrode ear and the negative electrode ear are arranged on the same side of the electrode body along the first direction, and the positive electrode ear and the negative electrode ear are arranged side by side along the third direction; along the third direction, one end of the positive electrode ear away from the negative electrode ear protrudes from the first elastomer; and / or, one end of the negative electrode ear away from the positive electrode ear protrudes from the first elastomer, thereby reducing the probability of the first elastomer damaging the positive electrode ear or the negative electrode ear.

[0012] According to an embodiment of the present application, the electrode ear includes a positive electrode ear and a negative electrode ear, the positive electrode ear and the negative electrode ear are arranged on the same side of the electrode body along the first direction, and the positive electrode ear and the negative electrode ear are arranged side by side along the third direction; along the third direction, one end of the positive electrode ear away from the negative electrode ear coincides with the edge of the first elastomer, and / or one end of the negative electrode ear away from the positive electrode ear coincides with the edge of the first elastomer along the third direction, thereby reducing the probability of the first elastomer damaging the positive electrode ear or the negative electrode ear, and increasing the volume of the first elastomer, thereby improving the supporting and limiting effect of the first elastomer on the electrode assembly.

[0013] In an embodiment of the present application, the electrode body further includes a side surface connected between two end surfaces, and the elastic component includes a second elastic body disposed between the housing and the side surface. The second elastic body can reduce the expansion stress on the side surface of the electrode body and define the position of the electrode body perpendicular to the first direction.

[0014] In an embodiment of the present application, the battery cell includes at least two electrode assemblies arranged side by side in the second direction, the second elastic body is disposed on at least one side of the electrode assembly in the third direction, and the first direction, the second direction, and the third direction are pairwise intersecting. The second elastic body can improve the pressure on the side surface of the electrode body in the third direction and at the same time reduce the influence of the second elastic body on the energy density of the battery cell.

[0015] In an embodiment of the present application, a support portion is disposed between the second elastic body and the electrode assembly, and the support portion is used to support the side surface of the electrode assembly. The support portion is used to support the side surface of the electrode body in the third direction, define the position of the electrode body in the third direction, and reduce the damage to the tab or the poor contact with the top cover assembly caused by the large range of movement of the electrode body in the third direction.

[0016] In an embodiment of the present application, along the first direction, the length of the second elastic body is less than or equal to the length of the support portion; and / or, along the second direction, the width of the second elastic body is less than or equal to the width of the support portion, so as to reduce the influence of the second elastic body on the energy density of the battery cell.

[0017] In a second aspect, the present application provides a battery device including the battery cell according to any one of the embodiments in the first aspect.

[0018] In a third aspect, the present application provides an electrical device including the battery device according to the embodiment in the fourth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0020] Figure 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0021] Figure 2 is an exploded structural diagram of a battery device according to some embodiments of the present application;

[0022] Figure 3 is a schematic structural diagram of a battery module according to some embodiments of the present application;

[0023] Figure 4 Explosion structure schematic diagram of a battery cell according to some embodiments of the present application;

[0024] Figure 5 Structure schematic diagram of a battery cell according to some embodiments of the present application;

[0025] Figure 6 Structure schematic diagram of a battery cell according to other embodiments of the present application;

[0026] Figure 7 Structure schematic diagram of a battery cell according to yet other embodiments of the present application;

[0027] Figure 8 Structure schematic diagram of a battery cell according to yet other embodiments of the present application;

[0028] Figure 9 Structure schematic diagram of a battery cell according to yet other embodiments of the present application;

[0029] Figure 10 Structure schematic diagram of a battery cell according to yet other embodiments of the present application;

[0030] Figure 11 Structure schematic diagram of a battery cell according to yet other embodiments of the present application;

[0031] Figure 12 Structure schematic diagram of a battery cell according to yet other embodiments of the present application;

[0032] Figure 13 Structure schematic diagram of the support part and the second elastic body of a battery cell according to some embodiments of the present application;

[0033] Figure 14 Structure schematic diagram of the support part and the second elastic body of a battery cell according to other embodiments of the present application.

[0034] Reference numerals:

[0035] 1, vehicle;

[0036] 10, battery device; 11, battery cell; 20, control system; 30, motor; 40, box body; 41, first box body part; 42, second box body part; 43, accommodating part; 50, battery module;

[0037] 100. Housing; 101. Opening; 110. Top cover assembly; 200. Electrode assembly; 210. Electrode body; 211. End face; 212. Side face; 212a. First side face; 212b. Second side face; 220. Transition section; 230. Tab; 230a. Positive tab; 230b. Negative tab; 231. First segment; 232. Second segment; 300. Elastic component; 310. First elastomer; 320. Second elastomer; 500. Support part;

[0038] X. First direction; Y. Second direction; Z. Third direction. Detailed implementation manners

[0039] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0041] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0042] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0043] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0044] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0045] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0046] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0047] Currently, from the perspective of the development of the market situation, the application of battery devices is becoming more and more extensive. Battery devices are not only applied to energy storage power systems such as hydraulic, thermal, wind, and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of battery devices, the market demand is also constantly increasing.

[0048] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can activate the active material and continue to be used by charging after discharging.

[0049] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application do not limit this.

[0050] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode tab, a negative electrode tab, and a separator. The battery cell mainly operates by the movement of metal ions between the positive electrode tab and the negative electrode tab. The positive electrode tab includes a positive current collector and a positive active material layer, and the positive active material layer is coated on the surface of the positive current collector; the positive current collector includes a positive current collecting portion and a positive electrode ear, the positive current collecting portion is coated with the positive active material layer, and the positive electrode ear is not coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, etc. The negative electrode tab includes a negative current collector and a negative active material layer, and the negative active material layer is coated on the surface of the negative current collector; the negative current collector includes a negative current collecting portion and a negative electrode ear, the negative current collecting portion is coated with the negative active material layer, and the negative electrode ear is not coated with the negative active material layer.

[0051] The electrode assembly includes an electrode body and an electrode ear led out from the electrode body. The electrode body is the electrical production part of the electrode assembly, and the active material inside it is used to carry out an electrochemical reaction with the electrolyte, etc., to generate a charging and discharging process. The electrode ear is used for external electrical connection to realize the charging and discharging of the electrode assembly.

[0052] In the related art, in the battery cell, the electrode ear is connected to the electrode body through a transition section, and no isolation component is provided between the electrode ear and the transition section, so that during the use of the battery cell, the end of the electrode ear may be inserted into the transition section to form a short circuit, affecting the reliability of the battery.

[0053] Based on the above technical problems, the present application provides a technical solution. The first elastomer abuts between the electrode ear and the transition section, which can not only reduce the risk of the electrode ear being inserted into the transition section to form a short circuit, but also limit the position of the electrode body and reduce the risk of damage to the electrode ear caused by the shaking of the electrode body.

[0054] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel or in a hybrid connection through a busbar component.

[0055] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module can be formed by tying a plurality of battery cells with a cable tie.

[0056] In some embodiments, the battery device can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0057] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0058] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells to the box.

[0059] In some embodiments, the box can be part of the chassis structure of a vehicle. For example, part of the box can form at least part of the floor of the vehicle, or part of the box can form at least part of the cross beams and longitudinal beams of the vehicle.

[0060] In some embodiments, the battery device can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0061] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using battery devices. The electrical devices are, for example, mobile phones, portable devices, laptop computers, battery cars, electric vehicles, ships, spacecrafts, electric toys, and electric tools, etc. Among them, the spacecrafts are, for example, airplanes, rockets, space shuttles, and spaceships, etc. The electric toys include, for example, fixed or mobile electric toys. Specifically, for example, game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc. The electric tools include, for example, metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools. Specifically, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers.

[0062] The battery cells described in the embodiments of the present application are not limited to the above-described electrical devices, but for the sake of simplicity of description, the following embodiments are all described by taking an electric vehicle as an example.

[0063] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle provided by an embodiment of the present application.

[0064] The vehicle 1 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, an extended-range vehicle, etc. A battery device 10 can be arranged inside the vehicle 1. Specifically, for example, the battery device 10 can be arranged at the bottom, the front end, or the rear end of the vehicle 1. The battery device 10 can be used for supplying power to the vehicle 1. For example, the battery device 10 can be used as the operating power source of the vehicle 1. The vehicle 1 can also include a control system 20 and a motor 30. The control system 20 is used to control, for example, the power supply of the battery device to the motor 30. The battery device can be used for starting, navigating, etc. of the vehicle 1. Of course, the battery device 10 can also be used to drive the vehicle 1 to travel, replacing or partially replacing fuel or natural gas to provide drive for the vehicle 1.

[0065] Figure 2 It is a schematic diagram of the explosion structure of a battery device provided by an embodiment of the present application. As Figure 2 shown, the battery device 10 includes a box body 40 and battery cells (not shown in the figure), and the battery cells are accommodated in the box body 40.

[0066] The box body 40 is used to accommodate battery cells, and the box body 40 can have various structures. In some embodiments, the box body 40 may include a first box body part 41 and a second box body part 42. The first box body part 41 and the second box body part 42 cover each other, and the first box body part 41 and the second box body part 42 jointly define a receiving part 43 for accommodating battery cells. The second box body part 42 can be a hollow structure with one end open, and the first box body part 41 is a plate-like structure. The first box body part 41 covers the open side of the second box body part 42 to form a box body with the receiving part 43; both the first box body part 41 and the second box body part 42 can also be hollow structures with one side open, and the open side of the first box body part 41 covers the open side of the second box body part 42 to form the box body 40 with the receiving part 43. Of course, the first box body part 41 and the second box body part 42 can have various shapes, such as a cylinder, a cuboid, etc.

[0067] In the battery device 10, there can be multiple battery cells. Multiple battery cells can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among multiple battery cells. Multiple battery cells can be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by multiple battery cells is accommodated in the box body 40; of course, it can also be that multiple battery cells are first connected in series, in parallel, or in a mixed connection to form battery modules 50, and then multiple battery modules 50 are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box body 40.

[0068] Figure 3 It is a schematic diagram of a battery module provided by an embodiment of the present application.

[0069] In some embodiments, as Figure 3 shown, there are multiple battery cells 11, and multiple battery cells 11 are first connected in series, in parallel, or in a mixed connection to form battery modules 50. Then multiple battery modules 50 are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box body.

[0070] In the first aspect, as Figure 4 and Figure 5As shown in the figure, the present application provides a battery cell 11, which includes: a housing 100, an electrode assembly 200, and an elastic assembly 300; the electrode assembly 200 is located inside the housing 100, and the electrode assembly 200 includes an electrode body 210, a transition section 220, and a tab 230. The electrode body 210 includes two end faces 211 disposed opposite to each other in the first direction X, and the tab 230 is connected to at least one of the two end faces 211 through the transition section 220; the elastic assembly 300 is disposed inside the housing 100, and the elastic assembly 300 includes a first elastic body 310, and at least a part of the first elastic body 310 abuts between the tab 230 and the transition section 220.

[0071] Exemplarily, the tab 230 is disposed on one of the two end faces 211, or the tab 230 is disposed on the two end faces 211.

[0072] Exemplarily, the number of tabs 230 can be two. The two tabs 230 are respectively disposed on the two end faces 211, or the two tabs 230 are disposed on the same end face 211.

[0073] Exemplarily, at least a part of the first elastic body 310 abuts between the tab 230 and the transition section 220 can be that a part of the first elastic body 310 abuts between the tab 230 and the transition section 220, or the whole first elastic body 310 abuts between the tab 230 and the transition section 220.

[0074] In this embodiment, the battery cell 11 includes a housing 100 and an electrode assembly 200, and the electrode assembly 200 is located inside the housing 100 for electrochemical reaction. The tab 230 is connected to the electrode body 210 through the transition section 220. The first elastic body 310 is disposed inside the housing 100, and at least a part of the first elastic body 310 abuts between the tab 230 and the transition section 220. The first elastic body 310 can reduce the risk of short circuit caused by the insertion of the tab 230 into the transition section 220, and improve the safety and reliability of the battery cell 11. Moreover, the electrode body 210 is located on the side of the transition section 220 away from the tab 230. The first elastic body 310 has elasticity, and the first elastic body 310 abutting between the tab 230 and the transition section 220 can improve the expansion stress of the electrode body 210, and limit the position of the electrode body 210, reduce the movement of the electrode body 210 to damage the tab 230, and improve the reliability of the battery cell 11.

[0075] Optionally, multiple electrode tabs are stacked together after being brought closer to form the tab 230.

[0076] Such as Figure 4 and Figure 5As shown, in some optional embodiments, the shell 100 includes an opening 101 in a first direction X, and the battery cell 11 also includes a top cover assembly 110, and the top cover assembly 110 covers the opening 101; the pole ear 230 includes a first segment 231 and a second segment 232 connected to each other, the first segment 231 extends along the first direction X and is connected between the transition segment 220 and the second segment 232, the second segment 232 extends along the second direction Y and is used to connect the top cover assembly 110, and at least a portion of the first elastomer 310 abuts between the second segment 232 and the transition segment 220.

[0077] Exemplarily, the opening 101 may be located on one side of the housing 100 along the first direction X, or the opening 101 may be located on both sides of the housing 100 along the first direction X.

[0078] Exemplarily, when the opening 101 is located on both sides of the housing 100 along the first direction X, there are two top cover assemblies 110 , and the two top cover assemblies 110 cover the two openings 101 respectively.

[0079] Exemplarily, at least part of the first elastomer 310 abuts between the second segment 232 and the transition segment 220 ; or, all of the first elastomer 310 abuts between the second segment 232 and the transition segment 220 .

[0080] In these optional embodiments, the top cover assembly 110 covers the opening 101 to close the electrode assembly 200 in the shell 100. The tab 230 includes a first segment 231 and a second segment 232 connected to each other, the second segment 232 is located on the side of the first segment 231 away from the transition section 220 along the first direction X, the second segment 232 is connected to the transition section 220 through the first segment 231, and the second segment 232 extends along the second direction Y to increase the contact connection area between the second segment 232 and the top cover assembly 110, thereby increasing the connection strength. At least part of the first elastic body 310 abuts between the second segment 232 and the transition section 220 to reduce the risk of short circuit caused by the second segment 232 being inserted into the transition section 220. In addition, the second segment 232 and the transition segment 220 are arranged opposite to each other along the first direction X, the top cover assembly 110 is located on the side of the second segment 232 away from the first elastomer 310, and the electrode body 210 is located on the side of the transition segment 220 away from the first elastomer 310. The first elastomer 310 applies a limiting force to the electrode body 210, thereby reducing the amplitude of movement of the electrode body 210 in the direction of approaching or moving away from the top cover assembly 110, thereby reducing the probability of damage to the pole ear 230.

[0081] Optionally, the first elastomer 310 can be an expansion tape. The expansion tape can expand in the thickness direction of the expansion tape when heated. The expansion tape is attached to the side of the transition section 220 facing away from the electrode body 210. The thickness direction of the expansion tape is parallel to the first direction X. After the top cover assembly 110 is installed on the housing 100, the expansion tape is heated. The expansion tape expands in the first direction X and abuts against the transition section 220 and the second segment 232 to form the first elastomer 310. The first elastomer 310 applies a limiting force to the electrode body 210, reducing the amplitude of movement of the electrode body 210 in the direction of approaching or departing from the top cover assembly 110, reducing the probability of damage to the tab 230. Moreover, the first elastomer 310 is located between the second segment 232 and the transition section 220, reducing the risk of short circuit.

[0082] Optionally, the transition section 220 includes a plurality of pole pieces. Along the direction approaching the tab 230, the plurality of pole pieces gradually approach each other. That is, along the direction of the electrode body 210 approaching the tab 230, the dimension of the transition section 220 in the second direction Y gradually decreases.

[0083] As Figure 6 shown, in some alternative embodiments, the number of the first elastomers 310 is two. The two first elastomers 310 are respectively disposed on both sides of the first segment 231 in the second direction Y. At least a part of one of the two first elastomers 310 abuts between the second segment 232 and the transition section 220, and at least a part of the other of the two first elastomers 310 abuts between the transition section 220 and the top cover assembly 110.

[0084] Exemplarily, at least a part of one of the two first elastomers 310 abuts between the second segment 232 and the transition section 220. It can be that a part of one of the two first elastomers 310 abuts between the second segment 232 and the transition section 220, or it can be that all of one of the two first elastomers 310 abuts between the second segment 232 and the transition section 220.

[0085] Exemplarily, at least a part of the other of the two first elastomers 310 abuts between the transition section 220 and the top cover assembly 110. It can be that a part of one of the two first elastomers 310 abuts between the transition section 220 and the top cover assembly 110, or it can be that all of one of the two first elastomers 310 abuts between the transition section 220 and the top cover assembly 110.

[0086] In these alternative embodiments, the thickness direction of at least a portion of the first segment 231 is parallel to the second direction Y. The two first elastomers 310 are disposed on both sides of the first segment 231 in the second direction Y, which can provide more sufficient space for arranging the first elastomers 310. At least a portion of one of the two first elastomers 310 abuts between the second segment 232 and the transition segment 220, reducing the risk of short circuit formed by the insertion of the second segment 232 into the transition segment 220. At least a portion of the other of the two first elastomers 310 abuts between the transition segment 220 and the top cover assembly 110. The first elastomer 310 applies a limiting force to the electrode body 210, reducing the movement range of the electrode body 210 in the first direction X. The first elastomer 310 defines the position of the electrode body 210 in the first direction X and can reduce the expansion stress of the electrode body 210 in the first direction X. Arranging the two first elastomers 310 on both sides of the first segment 231 in the second direction Y can improve the uniformity of the limiting force of the first elastomers 310 on the electrode body 210 and enhance the reliability of the battery cell 11.

[0087] As Figure 7 shown, in some alternative embodiments, a part of one of the two first elastomers 310 abuts between the second segment 232 and the transition segment 220, and another part abuts between the transition segment 220 and the top cover assembly 110.

[0088] In these alternative embodiments, the first elastomer 310 abuts between the top cover assembly 110 and the transition segment 220. The second segment 232 extends between one of the two first elastomers 310 and the top cover assembly 110. A part of one of the two first elastomers 310 abuts between the second segment 232 and the transition segment 220, reducing the risk of contact short circuit between the second segment 232 and the transition segment 220. Another part of one of the two first elastomers 310 abuts between the top cover assembly 110 and the transition segment 220 to define the movement space of the electrode body 210 in the housing 100.

[0089] As Figure 8 shown, in some alternative embodiments, a part of the other of the two first elastomers 310 abuts between the second segment 232 and the transition segment 220, and another part abuts between the transition segment 220 and the top cover assembly 110.

[0090] In these alternative embodiments, the first elastomer 310 abuts between the top cover assembly 110 and the transition section 220, and the second segment 232 extends between the other one of the two first elastomers 310 and the top cover assembly 110. A part of the other one of the two first elastomers 310 abuts between the second segment 232 and the transition section 220, reducing the risk of short circuit due to contact between the second segment 232 and the transition section 220. Another part of the other one of the two first elastomers 310 abuts between the top cover assembly 110 and the transition section 220 to define the movement space of the electrode body 210 in the housing 100 and reduce the expansion stress of the electrode body 210 in the first direction X.

[0091] As Figure 9 shown, in some alternative embodiments, the tab 230 protrudes from the first elastomer 310 in the third direction Z, and the first direction X, the second direction Y, and the third direction Z are pairwise intersecting.

[0092] Exemplarily, the tab 230 protruding from the first elastomer 310 in the third direction Z may be that the tab 230 protrudes from one side of the first elastomer 310 in the third direction Z, or that the tab 230 protrudes from both sides of the first elastomer 310 in the third direction Z.

[0093] In these alternative embodiments, the extending direction of each pole piece constituting the tab 230 is perpendicular to the third direction Z, that is, the thickness direction of the tab 230 is perpendicular to the third direction Z. The tab 230 protruding from the first elastomer 310 in the third direction Z reduces the extrusion of the tab 230 and the transition section 220 by the first elastomer 310 in the third direction Z, reducing the risk of damage to the tab 230 and the transition section 220 caused by the first elastomer 310.

[0094] Optionally, the first direction X, the second direction Y, and the third direction Z are pairwise perpendicular to each other.

[0095] As Figure 10 shown, in some alternative embodiments, the tab 230 coincides with the edge of the first elastomer 310 in the third direction Z, and the first direction X, the second direction Y, and the third direction Z are pairwise intersecting.

[0096] Exemplarily, the tab 230 coinciding with the edge of the first elastomer 310 in the third direction Z may be that the tab 230 coincides with one side edge of the first elastomer 310 in the third direction Z, or that the tab 230 coincides with both side edges of the first elastomer 310 in the third direction Z.

[0097] In these alternative embodiments, the tab 230 coincides with the edge of the first elastomer 310 along the third direction Z, that is, it reduces the extrusion of the tab 230 and the transition section 220 by the first elastomer 310 along the third direction Z, reduces the risk of damage to the tab 230 and the transition section 220 caused by the first elastomer 310, and can also increase the volume of the first elastomer 310, improve the limiting effect of the first elastomer 310 on the electrode body 210, and improve the effect of the first elastomer 310 on the electrode body 210 to improve the expansion stress.

[0098] As Figure 11 shown, in some alternative embodiments, the tab 230 includes a positive tab 230a and a negative tab 230b. The positive tab 230a and the negative tab 230b are arranged on the same side of the electrode body 210 along the first direction X, and the positive tab 230a and the negative tab 230b are arranged side by side along the third direction Z; along the third direction Z, the end of the positive tab 230a facing away from the negative tab 230b protrudes from the first elastomer 310; and / or, the end of the negative tab 230b facing away from the positive tab 230a protrudes from the first elastomer 310.

[0099] In these alternative embodiments, the positive tab 230a and the negative tab 230b are arranged on the same side of the electrode body 210 along the first direction X, and the positive tab 230a and the negative tab 230b are respectively connected between the transition section 220 and the top cover assembly 110. The positive tab 230a and the negative tab 230b are arranged side by side along the third direction Z. Along the third direction Z, the end of the positive tab 230a facing away from the negative tab 230b protrudes from the first elastomer 310, reducing the extrusion of the end of the positive tab 230a facing away from the negative tab 230b along the third direction Z by the first elastomer 310, and reducing the probability of damage to the positive tab 230a by the first elastomer 310. Along the third direction Z, the end of the negative tab 230b facing away from the positive tab 230a protrudes from the first elastomer 310, reducing the extrusion of the end of the negative tab 230b facing away from the positive tab 230a along the third direction Z by the first elastomer 310, and reducing the probability of damage to the negative tab 230b by the first elastomer 310.

[0100] Optionally, two first elastomers 310 are respectively arranged on both sides of the positive tab 230a and the negative tab 230b along the second direction Y, and both first elastomers 310 extend from one side of the positive tab 230a to the other side of the negative tab 230b, which can increase the volume of the first elastomer 310, improve the limiting effect of the first elastomer 310 on the electrode body 210, and improve the effect of the first elastomer 310 on the electrode body 210 to improve the expansion stress.

[0101] As Figure 12As shown, in some alternative embodiments, the tab 230 includes a positive tab 230a and a negative tab 230b. The positive tab 230a and the negative tab 230b are disposed on the same side of the electrode body 210 along the first direction X, and the positive tab 230a and the negative tab 230b are arranged side by side along the third direction Z. Along the third direction Z, one end of the positive tab 230a facing away from the negative tab 230b coincides with the edge of the first elastic body 310, and / or one end of the negative tab 230b facing away from the positive tab 230a coincides with the edge of the first elastic body 310 along the third direction Z.

[0102] In these alternative embodiments, the positive tab 230a and the negative tab 230b are disposed on the same side of the electrode body 210 along the first direction X, and the positive tab 230a and the negative tab 230b are respectively connected between the transition section 220 and the top cover assembly 110. The positive tab 230a and the negative tab 230b are arranged side by side along the third direction Z. Along the third direction Z, one end of the positive tab 230a facing away from the negative tab 230b coincides with the edge of the first elastic body 310, reducing the probability that the first elastic body 310 squeezes one end of the positive tab 230a facing away from the negative tab 230b along the third direction Z and reducing the probability that the first elastic body 310 damages the positive tab 230a. At the same time, the volume of the first elastic body 310 is increased, and the supporting and limiting effect of the first elastic body 310 on the electrode assembly 200 is improved. Along the third direction Z, one end of the negative tab 230b facing away from the positive tab 230a coincides with the edge of the first elastic body 310 along the third direction Z, reducing the probability that the first elastic body 310 squeezes one end of the negative tab 230b facing away from the positive tab 230a along the third direction Z and reducing the probability that the first elastic body 310 damages the negative tab 230b. At the same time, the volume of the first elastic body 310 is increased, and the supporting and limiting effect of the first elastic body 310 on the electrode assembly 200 is improved.

[0103] As Figure 4 and Figure 9 shown, in some alternative embodiments, the electrode body 210 further includes a side surface 212 connected between two end surfaces 211, and the elastic component 300 includes a second elastic body 320. The second elastic body 320 is disposed between the housing 100 and the side surface 212.

[0104] Exemplarily, the side surface 212 of the electrode body 210 may include a first side surface 212a oppositely disposed along the second direction Y and a second side surface 212b oppositely disposed along the third direction Z. The second elastic body 320 may be disposed on the first side surface 212a of the electrode body 210, or the second elastic body 320 may be disposed on the second side surface 212b of the electrode body 210.

[0105] In these alternative embodiments, the side surface 212 extends along the first direction X, and the second elastomer 320 is disposed between the housing 100 and the side surface 212 to reduce the expansion stress of the side surface 212 of the electrode body 210 and define the position of the electrode body 210 perpendicular to the first direction X. The second elastomer 320 is disposed between the side surface 212 of the electrode body 210 facing the second direction Y and the housing 100 to reduce the expansion stress of the electrode body 210 facing the second direction Y and define the position of the electrode body 210 along the second direction Y. The second elastomer 320 is disposed between the side surface 212 of the electrode body 210 facing the third direction Z and the housing 100 to reduce the expansion stress of the electrode body 210 facing the third direction Z and define the position of the electrode body 210 along the third direction Z. When the battery cell 11 is squeezed, the second elastomer 320 can improve the pressure on the side surface 212 of the electrode body 210, enhancing the reliability of the battery cell 11.

[0106] As Figure 4 and Figure 9 shown, in some alternative embodiments, the battery cell 11 includes at least two electrode assemblies 200. The at least two electrode assemblies 200 are arranged side by side along the second direction Y. The second elastomer 320 is disposed on at least one side of the electrode assembly 200 along the third direction Z. The first direction X, the second direction Y, and the third direction Z intersect pairwise.

[0107] Exemplarily, the second elastomer 320 can be disposed on one side of the electrode assembly 200 along the third direction Z, or the second elastomer 320 can be disposed on both sides of the electrode assembly 200 along the third direction Z.

[0108] In these alternative embodiments, the second elastomer 320 is disposed on at least one side of the electrode assembly 200 along the third direction Z to reduce the expansion stress of the electrode body 210 facing the third direction Z and define the position of the electrode body 210 along the third direction Z. When the battery cell 11 is squeezed, the second elastomer 320 can improve the pressure on the side surface 212 of the electrode body 210 along the third direction Z, enhancing the reliability of the battery cell 11.

[0109] Optionally, as Figure 4 and Figure 9 shown, the surface area of the first side surface 212a of the electrode body 210 disposed opposite along the second direction Y is larger than the surface area of the second side surface 212b of the electrode body 210 disposed opposite along the third direction Z. The second elastomer 320 is disposed on at least one side of the electrode assembly 200 along the third direction Z, which can reduce the influence of the second elastomer 320 on the energy density of the battery cell 11.

[0110] As Figure 9As shown, in some alternative embodiments, a support portion 500 is provided between the second elastomer 320 and the electrode assembly 200, and the support portion 500 is used to support the side surface 212 of the electrode assembly 200.

[0111] In these alternative embodiments, the support portion 500 is used to further support the side surface 212 of the electrode body 210 along the third direction Z, define the position of the electrode body 210 along the third direction Z, and reduce the damage to the tab 230 or the poor contact with the top cover assembly 110 caused by the large movement range of the electrode body 210 along the third direction Z.

[0112] Optionally, as Figure 9 shown, the end of the support portion 500 along the first direction X is connected to the top cover assembly 110 to define the position of the support portion 500, and further define the position of the electrode body 210 along the third direction Z.

[0113] Optionally, as Figure 13 and Figure 14 shown, along the first direction X, the length of the second elastomer 320 is less than or equal to the length of the support portion 500. The support portion 500 is located between the second elastomer 320 and the electrode body 210. The second elastomer 320 restricts the position of the electrode body 210 through the support portion 500. The length of the second elastomer 320 along the first direction X is less than or equal to the length of the support portion 500 along the first direction X, reducing the influence of the second elastomer 320 on the energy density of the battery cell 11.

[0114] Optionally, as Figure 13 and Figure 14 shown, along the second direction Y, the width of the second elastomer 320 is less than or equal to the width of the support portion 500. The support portion 500 is located between the second elastomer 320 and the electrode body 210. The second elastomer 320 restricts the position of the electrode body 210 through the support portion 500. The width of the second elastomer 320 along the second direction Y is less than or equal to the width of the support portion 500 along the second direction Y, reducing the influence of the second elastomer 320 on the energy density of the battery cell 11.

[0115] In a second aspect, the present application provides a battery device 10, including the battery cell 11 in any one of the embodiments in the first aspect above.

[0116] According to the battery device 10 provided in the embodiments of the present application, since the battery cell 11 provided in the first aspect above is adopted, it has all the beneficial effects of the battery cell 11 in any one of the embodiments in the first aspect. For the specific description of the battery cell 11, reference may be made to the specific descriptions of the battery cell 11 in the above embodiments, and the details are not repeated herein.

[0117] In a third aspect, the present application further provides an electrical device, including the battery device 10 in any of the embodiments of the second aspect, and the battery device 10 is used to store or provide electrical energy.

[0118] In some alternative embodiments, the battery cell 11 includes: a housing 100, an electrode assembly 200, and an elastic assembly 300; the electrode assembly 200 is located inside the housing 100, the electrode assembly 200 includes an electrode body 210, a transition section 220, and a tab 230, the electrode body 210 includes two end faces 211 oppositely arranged in the first direction X, and the tab 230 is connected to at least one of the two end faces 211 through the transition section 220. The elastic assembly 300 is arranged inside the housing 100, the elastic assembly 300 includes a first elastic body 310 and a second elastic body 320, the number of the first elastic bodies 310 is two, and the two first elastic bodies 310 are respectively arranged on both sides of the first segment 231 in the second direction Y. A part of one of the two first elastic bodies 310 abuts between the second segment 232 and the transition section 220, and another part abuts between the transition section 220 and the top cover assembly 110. A part of the other of the two first elastic bodies 310 abuts between the second segment 232 and the transition section 220, and another part abuts between the transition section 220 and the top cover assembly 110. The tab 230 protrudes from the first elastic body 310 in the third direction Z, or the tab 230 coincides with the edge of the first elastic body 310 in the third direction Z. The first direction X, the second direction Y, and the third direction Z intersect pairwise. The electrode body 210 further includes a side face 212 connected between the two end faces 211, and the second elastic body 320 is arranged between the housing 100 and the side faces 212 on both sides of the electrode assembly 200 in the third direction Z.

[0119] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; 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 present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: case; an electrode assembly, located in the housing, the electrode assembly comprising an electrode body, a transition section and a pole ear, the electrode body comprising two end surfaces arranged opposite to each other in a first direction, the pole ear being connected to at least one of the two end surfaces through the transition section; The elastic component is arranged in the shell, and the elastic component includes a first elastic body, at least a part of the first elastic body abuts between the pole ear and the transition section.

2. The battery cell according to claim 1, characterized in that: The shell includes an opening in the first direction, and the battery cell also includes a top cover assembly, which covers the opening; the pole ear includes a first segment and a second segment connected to each other, the first segment extends along the first direction and is connected between the transition segment and the second segment, the second segment extends along the second direction and is used to connect the top cover assembly, and at least a portion of the first elastomer abuts between the second segment and the transition segment.

3. The battery cell according to claim 2, characterized in that: The number of the first elastomers is two, and the two first elastomers are arranged on both sides of the first segment in the second direction, one of the two first elastomers at least partially abuts between the second segment and the transition segment, and the other of the two first elastomers at least partially abuts between the transition segment and the top cover assembly.

4. The battery cell according to claim 3, characterized in that: A portion of the first elastic body abuts between the second segment and the transition segment, and another portion of the first elastic body abuts between the transition segment and the top cover assembly.

5. The battery cell according to claim 2, characterized in that: The pole lug protrudes from the first elastic body along the third direction, or the pole lug overlaps with an edge of the first elastic body along the third direction, and the first direction, the second direction and the third direction are arranged to intersect each other.

6. The battery cell according to claim 2, characterized in that: The electrode tabs include a positive electrode tab and a negative electrode tab, the positive electrode tab and the negative electrode tab are arranged on the same side of the electrode body along the first direction, and the positive electrode tab and the negative electrode tab are arranged side by side along the third direction; Along the third direction, one end of the positive electrode tab away from the negative electrode tab protrudes from the first elastic body; and / or one end of the negative electrode tab away from the positive electrode tab protrudes from the first elastic body.

7. The battery cell according to claim 2, characterized in that: The electrode tabs include a positive electrode tab and a negative electrode tab, the positive electrode tab and the negative electrode tab are arranged on the same side of the electrode body along the first direction, and the positive electrode tab and the negative electrode tab are arranged side by side along the third direction; Along the third direction, one end of the positive electrode ear away from the negative electrode ear overlaps with an edge of the first elastomer, and / or one end of the negative electrode ear away from the positive electrode ear overlaps with an edge of the first elastomer along the third direction.

8. The battery cell according to claim 1, characterized in that: The electrode body further includes a side surface connected between the two end surfaces, and the elastic component includes a second elastic body, and the second elastic body is arranged between the shell and the side surface.

9. The battery cell according to claim 8, characterized in that: The battery cell includes at least two electrode assemblies, which are arranged side by side along the second direction. The second elastic body is arranged on at least one side of the electrode assembly along the third direction. The first direction, the second direction and the third direction are arranged to intersect each other.

10. The battery cell according to claim 9, characterized in that: A supporting portion is disposed between the second elastic body and the electrode assembly, and the supporting portion is used to support the side surface of the electrode assembly.

11. The battery cell according to claim 10, characterized in that: Along the first direction, the length of the second elastic body is less than or equal to the length of the supporting portion; And / or, along the second direction, the width of the second elastic body is less than or equal to the width of the supporting portion.

12. A battery device, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 11.

13. An electrical device, characterized in that: A battery device comprising the battery device of claim 12.

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