A battery cell, a battery and an electric device

Abstract

The application belongs to the technical field of power batteries, and particularly relates to a battery monomer, a battery and a power utilization device. The battery monomer comprises a pole, a contact finger and a pressing piece, the pole is provided with a groove, the contact finger is arranged in the groove and is electrically connected with the pole, the contact finger comprises a connecting part and a contact finger protruding from the connecting part, the contact finger is used for abutting against a plug of a conductive row, the pressing piece is slidably connected with the connecting part and abuts against the contact finger, the pressing piece can push the contact finger to deform to separate from the plug after being pressed, and the pressing piece can reset under the action of the contact finger. The contact finger and the plug of the conductive row are matched in a way of abutting contact electric connection without welding. The contact finger is deformed to separate from the plug by pressing the pressing piece, the conductive row and the battery monomer are conveniently disassembled, the secondary use of the conductive row and the individual replacement of the single battery monomer are realized, and the maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of power battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Technology

[0002] Currently, battery cells are connected using busbars to achieve series and parallel connections. The industry typically welds the terminals of the battery cells to the busbars to achieve a stable electrical connection.

[0003] However, when a battery cell malfunctions and needs replacement, it is difficult to disconnect the battery cell from the busbar. If destructive disassembly is used, the busbar cannot be reused, requiring the removal of connected busbars. These connected busbars are also connected to other battery cells, which can affect those cells. This makes it difficult to replace individual battery cells in actual use. Furthermore, destructive disassembly can damage the battery cell's terminals, increasing maintenance costs. Summary of the Invention

[0004] The purpose of this invention is to provide a battery cell, a battery, and an electrical device that can solve the problems of difficulty in disassembling the battery cell and the busbar, affecting the secondary use of the busbar, and the difficulty in replacing a single battery cell.

[0005] To achieve this objective, firstly, the present invention adopts the following technical solution: A single battery cell, comprising: The electrode post has a groove provided on it; A contact finger is disposed in the groove and electrically connected to the pole post. The contact finger includes a connecting part and a contact finger protruding from the connecting part. The contact finger is used to abut against the plug of the conductive busbar. The pressing member is slidably connected to the connecting part and abuts against the contact finger. The pressing member can push the contact finger to deform and separate from the plug after being pressed, and the pressing member can be reset under the action of the contact finger.

[0006] As an alternative to the aforementioned battery cell, the end of the contact finger facing the plug is provided with a first guide slope, which extends obliquely towards the center along the edge of the groove. The first guide slope extends obliquely toward the bottom surface of the groove, and the contact finger forms a sharp corner at the bottom end of the first guide slope.

[0007] As an alternative to the aforementioned battery cell, the number of the contacts is set to multiple, and the multiple contacts are arranged in at least two rows along the axial direction of the connecting portion, with adjacent rows of contacts staggered.

[0008] As an alternative to the aforementioned battery cell, the groove includes a first clearance groove and a positioning groove arranged sequentially from bottom to top. The radial dimension of the first clearance groove is smaller than the radial dimension of the positioning groove. The connecting part is disposed in the positioning groove, and at least a portion of the touch finger can extend into the first clearance groove and is spaced apart from the bottom surface of the first clearance groove.

[0009] As an alternative to the aforementioned battery cell, the connecting part is fixedly connected to the positioning groove.

[0010] As an alternative to the aforementioned battery cell, the positioning groove includes a first groove segment and a second groove segment, wherein the first groove segment is located below the second groove segment, and the radial dimension of the first groove segment is smaller than the radial dimension of the second groove segment. The connecting portion includes a first outer diameter section and a second outer diameter section. The outer diameter of the first outer diameter section is smaller than the outer diameter of the second outer diameter section. The first outer diameter section is located in the first groove section, and the second outer diameter section is located in the second groove section.

[0011] As an alternative to the aforementioned battery cell, the groove further includes a second clearance groove located above the positioning groove, the radial dimension of the second clearance groove being larger than the radial dimension of the positioning groove, and the top end of the pressing member being located within the second clearance groove.

[0012] As an alternative to the aforementioned battery cell, the pressing member is provided with a first through hole, and at least a portion of the touch fingers pass through the first through hole; And / or, the pressing member includes an annular body, the connecting part is sleeved on the annular body, one of the outer annular surface of the annular body and the inner annular surface of the connecting part is provided with a protruding part, and the other is provided with a concave part, the protruding part is located in the concave part and can move along the axial direction of the annular body.

[0013] To achieve this objective, secondly, the present invention adopts the following technical solution: A battery comprising: Multiple battery cells as described above, wherein the multiple battery cells are arranged in multiple rows; The conductive busbar includes a connecting plate and plugs disposed at both ends of the connecting plate. The plugs extend into the groove and abut against the contact fingers to connect two adjacent battery cells via the busbar.

[0014] To achieve this objective, in a third aspect, the present invention adopts the following technical solution: An electrical device comprising the aforementioned battery.

[0015] The beneficial effects of this invention are: In the battery cell provided by this invention, by setting a contact finger and a pressing member at the terminal post, the contact finger and the plug of the conductive busbar are connected by contact electrical connection, which does not require welding; by pressing the pressing member, the contact finger is deformed and separated from the plug, which facilitates the disassembly of the conductive busbar and the battery cell, thereby realizing the secondary use of the conductive busbar and the individual replacement of the battery cell, which helps to reduce maintenance costs.

[0016] The battery and power device provided by the present invention use the above-mentioned battery cells, which can solve the problems of the difficulty in disassembling the battery cells and the conductors, the impact on the secondary use of the conductors, and the difficulty in replacing individual battery cells. Attached Figure Description

[0017] Figure 1 This is a partial structural schematic diagram of the battery provided by the present invention; Figure 2 This is a cross-sectional view of the position where the battery cell and the conductive busbar are coupled, provided by the present invention. Figure 3 This is a partial structural cross-sectional view of the battery cell provided by the present invention; Figure 4 This is a schematic diagram of the structure of the finger-shaped component provided by the present invention; Figure 5 This is a top view of the finger-shaped component provided by the present invention; Figure 6 This is a cross-sectional view of the pole provided by the present invention; Figure 7 This is a first cross-sectional view of the finger contact element provided by the present invention; Figure 8 This is a second cross-sectional view of the finger contact element provided by the present invention; Figure 9 This is a cross-sectional view of the contact finger and the pole provided by the present invention after assembly; Figure 10 This is a schematic diagram of the pressing component provided by the present invention; Figure 11 This is a top view of the pressing component provided by the present invention; Figure 12 This is a schematic diagram of the assembled structure of the finger-shaped component and the pressing component provided by the present invention; Figure 13 This is a cross-sectional view of the finger-shaped component and the pressing component provided by the present invention after assembly.

[0018] In the picture: 10. Battery cell; 11. Cell body; 12. Terminal post; 121. First clearance groove; 122. Positioning groove; 1221. First groove segment; 1222. Second groove segment; 123. Second clearance groove; 13. Contact finger; 131. Connecting part; 1311. First outer diameter segment; 1312. Second outer diameter segment; 1313. Second protrusion; 1314. First concave part; 132. Contact finger; 132a. First contact finger; 132b. Second contact finger; 1321. First guide slope; 1322. Sharp corner; 14. Pressing part; 141. Annular body; 1411. First through hole; 1412. Second guide slope; 142. Pressing flange; 143. First protrusion; 144. Second concave part; 20. Conductive busbar; 21. Connecting plate; 22. Plug. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] This invention provides an electrical device, including a main body and a battery disposed on the main body, the battery providing electrical energy to the main body. The electrical device can take many forms, such as mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, power tools, or various household appliances. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0024] In this embodiment, the electrical device is described using a vehicle as an example. A battery is installed inside the vehicle, located at the bottom, front, or rear. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle, such as a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle. The battery not only serves as the vehicle's operating power source but also as its driving power source, replacing or partially replacing gasoline or natural gas to provide propulsion.

[0025] The present invention provides a battery, which refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0026] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery.

[0027] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells housed within the housing.

[0028] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0029] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0030] like Figure 1As shown, in this embodiment, the battery includes multiple battery cells 10 and a conductive busbar 20. The multiple battery cells 10 are arranged in multiple rows and layers. The conductive busbar 20 electrically connects two adjacent battery cells 10 to achieve series and / or parallel connection of the multiple battery cells 10. The conductive busbar 20 includes a connecting plate 21 and a plug 22. The connecting plate 21 extends along the arrangement direction of two adjacent battery cells 10, and both ends of the connecting plate 21 are connected to plugs 22. The plugs 22 are used to electrically connect the battery cells 10 to achieve electrical connection between two adjacent battery cells 10.

[0031] In existing technologies, the busbar is generally connected to the terminal post of the battery cell by welding. Although this ensures the stability of the electrical connection, it makes it difficult to disassemble the busbar and the battery cell. Only destructive disassembly methods can be used, which makes it difficult to replace individual battery cells in actual use and increases maintenance costs.

[0032] To address the aforementioned issues, this embodiment improves the structure of the battery cell 10 by making the plug 22 and the battery cell 10 detachable. This ensures a stable electrical connection while allowing the plug 22 to be disassembled without damaging the structure of the battery cell 10 and the conductive busbar 20. This enables both the battery cell 10 and the conductive busbar 20 to be reused, facilitating the replacement of individual battery cells 10 or conductive busbar 20 as needed during actual use, thereby reducing maintenance costs.

[0033] Specifically, such as Figure 2 As shown, the battery cell 10 includes a cell body 11, terminals 12, contact fingers 13, and pressing members 14. The cell body 11 includes a housing component, an electrode assembly, and an electrolyte. The housing component houses the electrode assembly and the electrolyte. At least one electrode assembly is housed within the housing component. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The electrode assembly can be a wound structure or a stacked structure, etc. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates.

[0034] A positive electrode typically includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated onto the positive current collector. The positive current collector without a positive active material layer protrudes from the one with a positive active material layer, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the material of the positive active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0035] A negative electrode typically includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated onto the negative current collector. The negative current collector without a negative active material layer protrudes from the negative current collector with a negative active material layer, and the negative current collector without a negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the material of the negative active material layer can be carbon or silicon, etc.

[0036] To prevent short circuits caused by contact between the positive and negative electrodes, an insulating element is installed between them.

[0037] This application does not impose any particular restrictions on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0038] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0039] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0040] The electrode assembly also includes tabs, which are the internal current lead-out or lead-in terminals of the electrode assembly (bare cell). Tabs are the core transitional components connecting the internal electrode plates of the cell to the external circuitry. The tabs are directly connected to the positive and negative electrode plates and are connected to the current collector, undertaking the function of current conduction during cell charging and discharging. In this example, the tab can be either a positive or negative tab. When the tab is a positive tab, the connected terminal is the positive terminal; when the tab is a negative tab, the connected terminal is the negative terminal. The tab can be directly connected to the terminal or indirectly connected via an adapter.

[0041] The electrode post 12 is disposed on the main body 11 of the battery cell. Specifically, the electrode post 12 is located on the housing component and is electrically connected to the tabs of the electrode assembly to conduct current outward. The electrode post 12 is provided with a groove; the contact finger 13 is disposed in the groove and is electrically connected to the electrode post 12. The contact finger 13 includes a connecting part 131 and a contact finger 132 protruding from the connecting part 131. The plug 22 extends into the groove and abuts against the contact finger 132; the pressing member 14 is slidably connected to the connecting part 131 and abuts against the contact finger 132. The pressing member 14 can push the contact finger 132 to deform after being pressed, so that the contact finger 132 is separated from the plug 22. When the contact finger 132 is reset, it can drive the pressing member 14 to reset.

[0042] When the conductive busbar 20 connects two adjacent battery cells 10, the plug 22 extends into the groove and abuts against the contact finger 132. The contact finger 132 undergoes elastic deformation. On the one hand, under the action of elastic deformation force, the contact finger 132 and the plug 22 can remain in contact, achieving good electrical connection contact. On the other hand, the elastic force applied by the contact finger 132 to the plug 22 can prevent the plug 22 from coming out of the groove, avoiding separation of the contact finger 132 and the plug 22 due to vibration or other reasons, thereby ensuring the reliability of the electrical connection.

[0043] When it is necessary to replace the battery cell 10 or the conductive busbar 20, press the pressing member 14. This applies external force to the pressing member 14, squeezing the contact finger 132 towards the bottom of the groove. The contact finger 132 deforms, separating from the plug 22, allowing the plug 22 to be easily removed from the groove. This allows the conductive busbar 20 to be detached from the battery cell 10. This disassembly method is simple to operate and has no impact on the battery cell 10 or the conductive busbar 20, thus enabling the secondary use of the conductive busbar 20 and the individual replacement of each battery cell 10, which helps reduce maintenance costs.

[0044] It should be noted that the touch finger 132 itself is elastic so that it can deform when the pressing member 14 is pressed down and automatically return to its original position after the pressing member 14 is released.

[0045] In some embodiments, after the plug 22 is installed with the battery cell 10, the bottom of the plug 22 extends beyond the contact fingers 132 to ensure that the plug 22 contacts all the contact fingers 132, thereby ensuring more contact points and enhancing the overcurrent effect.

[0046] In some embodiments, combined with Figure 3 and Figure 4As shown, along the edge of the groove pointing towards the center, the contact finger 132 extends obliquely toward the bottom surface of the groove. When the plug 22 is inserted into the groove, the oblique direction of the contact finger 132 can conform to the insertion direction of the plug 22. The plug 22 first abuts against the contact finger 132, so that the contact finger 132 deforms to provide space for the insertion of the plug 22. Subsequently, the plug 22 is inserted into place, and the free end of the obliquely extending contact finger 132 abuts against the circumferential sidewall of the plug 22. Using its oblique tendency, it provides resistance for the plug 22 to come out of the groove, so as to ensure the stability of the connection between the plug 22 and the battery cell 10.

[0047] In some embodiments, the end of the contact finger 132 facing the plug 22 is provided with a first guide slope 1321, which extends obliquely towards the center along the edge of the groove. The first guide slope 1321 extends obliquely towards the bottom surface of the groove, and the contact finger 132 forms a sharp corner 1322 at the bottom end of the first guide slope 1321. By providing the first guide slope 1321, the plug 22 can be guided during insertion into the groove, reducing the resistance when the plug 22 is inserted and centering the plug 22 in the groove, thus providing a positioning function. By forming a sharp corner 1322 at the bottom end of the first guide slope 1321, the sharp corner 1322 can penetrate the plug 22 when it abuts, ensuring good electrical contact.

[0048] It should be noted that the pointed corner 1322 is a sharp edge with a certain length, or it can be a pointed structure; there is no limitation here.

[0049] In some other embodiments, the free end of the finger 132 can be a conical structure with the tip of the conical structure angled toward the bottom of the groove so as to guide the plug 22 through the conical surface of the conical structure, while using the apex of the conical structure to achieve good electrical contact with the plug 22.

[0050] In some other embodiments, the finger 132 may also be of other shapes, as long as it can form a sharp corner 1322 to ensure good electrical contact with the plug 22.

[0051] To ensure good contact between the contact finger 13 and the electrode post 12 and the plug 22, in some embodiments, such as Figure 4As shown, the connecting portion 131 is annular, and the number of contact fingers 132 is set to multiple. The multiple contact fingers 132 are arranged circumferentially along the connecting portion 131 and protrude from the inner annular surface of the connecting portion 131. By setting the connecting portion 131 in an annular shape, the connecting portion 131 can be in contact with the inner wall of the groove all around the circumference, increasing the contact area between the connecting portion 131 and the pole post 12 and ensuring the electrical connection effect between the connecting portion 131 and the pole post 12. By setting multiple contact fingers 132 and arranging them circumferentially along the connecting portion 131, the contact area and contact position between the contact fingers 13 and the plug 22 can be increased, realizing reliable contact between the plug 22 and the contact fingers 13.

[0052] In some embodiments, multiple contact fingers 132 are arranged in two rows along the axial direction of the connecting portion 131, with adjacent rows of contact fingers 132 staggered. Specifically, the lower contact finger 132 is the first contact finger 132a, and the upper contact finger 132 is the second contact finger 132b. Along the axial direction of the connecting portion 131, the first contact finger 132a is located between two adjacent second contact fingers 132b. This arrangement can increase the number of contact fingers 132 while ensuring a certain distance between two adjacent contact fingers 132 in each row, facilitating the deformation of the contact fingers 132 under external force. The staggered arrangement of adjacent rows of contact fingers 132 not only ensures uniform force on the pressing member 14 but also accommodates assembly and dimensional errors between the plug 22 and the contact fingers 132, ensuring that the contact positions of the two rows of contact fingers 132 and the plug 22 are different in the circumferential direction, thus ensuring that some contact fingers 132 can make good contact with the plug 22.

[0053] In some other embodiments, the multiple fingers 132 can be arranged in one row, or in three, four or more rows, and the specific number of rows can be set according to actual needs.

[0054] To ensure that each row of contact fingers 132 can make contact with the plug 22, such as Figure 5 As shown, the length of the contact fingers 132 increases gradually along the axial direction of the groove towards the bottom surface of the groove. That is, the contact fingers 132 closer to the opening of the groove are shorter to facilitate the insertion of the plug 22 into the groove, and the contact fingers 132 closer to the bottom surface of the groove are longer to provide sufficient resistance for the plug 22 to come out of the groove.

[0055] In some embodiments, such as Figure 6 As shown, the groove includes a first clearance groove 121 and a positioning groove 122 arranged sequentially from bottom to top. The radial dimension of the first clearance groove 121 is smaller than the radial dimension of the positioning groove 122. The connecting part 131 is disposed in the positioning groove 122, and at least a portion of the touch finger 132 can extend into the first clearance groove 121 and is spaced apart from the bottom surface of the first clearance groove 121. By providing the first clearance groove 121, deformation space can be provided for the touch finger 132 when it is squeezed by the plug 22 and the pressing member 14.

[0056] In some embodiments, the connecting part 131 is fixedly connected to the positioning groove 122 to improve the stability of the position of the connecting part 131 and prevent the connecting part 131 from detaching from the pole post 12.

[0057] In some embodiments, the connecting part 131 is welded to the positioning groove 122 to improve the fixing effect.

[0058] In some embodiments, reference is made to Figures 7-9 The positioning groove 122 includes a first groove segment 1221 and a second groove segment 1222. The first groove segment 1221 is located below the second groove segment 1222, and the radial dimension of the first groove segment 1221 is smaller than the radial dimension of the second groove segment 1222. The connecting part 131 includes a first outer diameter segment 1311 and a second outer diameter segment 1312. The outer diameter of the first outer diameter segment 1311 is smaller than the outer diameter of the second outer diameter segment 1312. The first outer diameter segment 1311 is located in the first groove segment 1221, and the second outer diameter segment 1312 is located in the second groove segment 1222.

[0059] In some embodiments, the lower row of fingers 132 contacts the bottom surface of the first groove segment 1221 to limit the deformation of the fingers 132 by the first groove segment 1221, so as to prevent the fingers 132 from deforming too much and failing to automatically reset.

[0060] In some embodiments, the second outer diameter section 1312 is welded to the second groove section 1222. The top of the circumferential sidewall of the connecting part 131 is welded to the sidewall of the positioning groove 122 to reduce the welding difficulty, while ensuring the fixing effect through the circumferential welding area.

[0061] Optionally, the connecting part 131 and the pole post 12 can be fixed by laser welding.

[0062] refer to Figure 3 and Figure 9 As shown, the groove also includes a second clearance groove 123 located above the positioning groove 122. The radial dimension of the second clearance groove 123 is larger than that of the positioning groove 122, and the top of the pressing member 14 is located within the second clearance groove 123. By providing the second clearance groove 123, on the one hand, the height of the pressing member 14 protruding from the terminal post 12 can be reduced, thereby avoiding affecting the dimension in the height direction of the battery cell 10 and reducing the probability of accidental contact between the pressing member 14 and other structures; on the other hand, it can also provide space for welding and fixing the positioning groove 122 and the connecting part 131, facilitating welding.

[0063] To facilitate contact between the contact finger 132 and the plug 22, the pressing member 14 is provided with a first through hole 1411, through which at least a portion of the contact finger 132 passes, and / or, at least a portion of the contact finger 132 is located below the pressing member 14. When the plug 22 mates with the battery cell 10, the plug 22 extends into the pressing member 14, and the contact finger 132 extends out through the first through hole 1411, or the contact finger 132 extends out from the bottom end of the pressing member 14, so as to contact the plug 22.

[0064] In some embodiments, the bottom row of contact fingers 132 is located below the pressing member 14, and the remaining rows of contact fingers 132 are each provided with a first through hole 1411 to reduce the number of openings on the pressing member 14 and ensure that each row of contact fingers 132 can contact the plug 22. The contact fingers 132 that mate with the first through hole 1411 deform under the abutment of the side wall of the first through hole 1411, and the bottom row of contact fingers 132 deforms under the abutment of the bottom end of the pressing member 14.

[0065] In some other embodiments, all the fingers 132 can be located below the pressing member 14, thereby avoiding the need to provide the first through hole 1411 and improving the structural strength of the pressing member 14; or, each finger 132 can be provided with a corresponding first through hole 1411.

[0066] To facilitate applying pressure to the pressing member 14, the pressing member 14 further includes a pressing flange 142 connected to the top end of the annular body 141. The pressing flange 142 extends outward from the annular body 141 and covers at least a portion of the top surface of the connecting portion 131. By increasing the pressing flange 142, the pressing contact area with the pressing member 14 can be increased, thereby facilitating the removal of the plug 22.

[0067] In some embodiments, the outer diameter of the pressing flange 142 is smaller than the outer diameter of the connecting portion 131. On the one hand, this exposes the circumferential edge of the connecting portion 131, making it easier to weld and fix the connecting portion 131 and the pole post 12; on the other hand, it avoids obstructing the pole post 12.

[0068] In some embodiments, the connecting portion 131 is annular and sleeved around the pressing member 14, with the inner annular surface of the pressing member 14 engaging with the inner annular surface of the connecting portion 131. This engagement between the pressing member 14 and the connecting portion 131 prevents the pressing member 14 from disengaging from the connecting portion 131, increasing assembly stability. Furthermore, it increases the contact area between the connecting portion 131 and the pressing member 14, preventing excessive pressure during pressing due to a small contact area, thus avoiding the touch finger 132 exceeding its elastic limit.

[0069] Specifically, such as Figure 10As shown, the pressing member 14 includes an annular body 141 and a connecting part 131 sleeved on the annular body 141. One of the outer annular surface of the annular body 141 and the inner annular surface of the connecting part 131 is provided with a protruding part, and the other is provided with a concave part. The protruding part is located in the concave part and can move along the axial direction of the annular body 141.

[0070] In some embodiments, a gap is provided between the circumferential side surface of the protrusion and the circumferential side surface of the concave portion to avoid the protrusion and concave portion being too stably assembled, resulting in excessive resistance when the pressing member 14 is pressed, making it difficult to slide. In some embodiments, the contact position between the pressing member 14 and the finger 132 is close to the free end of the finger 132, so as to avoid the pressing member 14 only abutting against the root of the finger 132, which would make it difficult for the finger 132 to deform.

[0071] In some embodiments, a second guide slope 1412 is formed at the bottom end of the outer annular surface of the annular body 141. The second guide slope 1412 extends obliquely toward the center of the annular body 141 along the pressing direction of the pressing member 14. By providing the second guide slope 1412, the contact position between the annular body 141 and the lowermost finger 132 can be moved toward the free end of the finger 132, thereby facilitating the deformation of the finger 132 after being abutted by the annular body 141.

[0072] In some embodiments, the outer ring surface of the annular body 141 and the inner ring surface of the connecting portion 131 are provided with protrusions and concave portions, so as to improve the reliability of the engagement between the annular body 141 and the connecting portion 131 through nested concave-convex fit; by designing the size of the concave portion along the height direction of the battery cell 10 to be larger than the size of the corresponding protrusion along the height direction of the battery cell 10, the annular body 141 can slide relative to the connecting portion 131, thereby changing the deformation of the touch finger 132.

[0073] In some embodiments, such as Figure 11 As shown, the outer annular surface of the ring-shaped body 141 is provided with a first protrusion 143, which is spaced apart from the pressing flange 142 to form a second concave portion 144; as Figure 8 As shown, the inner annular surface of the connecting portion 131 has a second protrusion 1313, and a first concave portion 1314 is formed between the second protrusion 1313 and an adjacent row of contact fingers 132. When the pressing member 14 mates with the contact finger member 13, the connection... Figure 12 and Figure 13 As shown, the first protrusion 143 extends into the first concave portion 1314, and the second protrusion 1313 extends into the second concave portion 144. Through the double concave-convex fit, the fit stability between the pressing member 14 and the finger member 13 is improved.

[0074] In some embodiments, the finger member 13 is provided with two rows of fingers 132, and a first recess 1314 is formed between the second protrusion 1313 and the lower row of fingers 132. The upper row of fingers is integrally formed with the second protrusion 1313 to improve the connection strength.

[0075] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery cell, characterized by, include: The pole post (12) is provided with a groove; The contact finger (13) is disposed in the groove and electrically connected to the pole (12). The contact finger (13) includes a connecting part (131) and a contact finger (132) protruding from the connecting part (131). The contact finger (132) is used to abut against the plug (22) of the conductive bus (20). The pressing member (14) is slidably connected to the connecting part (131) and abuts against the contact finger (132). The pressing member (14) can push the contact finger (132) to deform after being pressed so as to separate from the plug (22), and the pressing member (14) can be reset under the action of the contact finger (132).

2. The battery cell according to claim 1, characterized in that, The end of the finger (132) facing the plug (22) is provided with a first guide slope (1321) pointing towards the center along the edge of the groove. The first guide slope (1321) extends obliquely toward the bottom surface of the groove, and the finger (132) forms a sharp corner (1322) at the bottom end of the first guide slope (1321).

3. The battery cell according to claim 1, characterized in that, The number of the fingers (132) is set to multiple, and the multiple fingers (132) are arranged in at least two rows along the axial direction of the connecting part (131), with adjacent rows of fingers (132) staggered.

4. The battery cell according to any one of claims 1-3, characterized in that, The groove includes a first clearance groove (121) and a positioning groove (122) arranged sequentially from bottom to top. The radial dimension of the first clearance groove (121) is smaller than the radial dimension of the positioning groove (122). The connecting part (131) is disposed in the positioning groove (122). At least part of the finger (132) can extend into the first clearance groove (121) and is spaced apart from the bottom surface of the first clearance groove (121).

5. The battery cell according to claim 4, characterized in that, The connecting part (131) is fixedly connected to the positioning groove (122).

6. The battery cell according to claim 4, characterized in that, The positioning groove (122) includes a first groove segment (1221) and a second groove segment (1222). The first groove segment (1221) is located below the second groove segment (1222), and the radial dimension of the first groove segment (1221) is smaller than the radial dimension of the second groove segment (1222). The connecting part (131) includes a first outer diameter section (1311) and a second outer diameter section (1312). The outer diameter of the first outer diameter section (1311) is smaller than the outer diameter of the second outer diameter section (1312). The first outer diameter section (1311) is located in the first groove section (1221), and the second outer diameter section (1312) is located in the second groove section (1222).

7. The battery cell according to claim 4, characterized in that, The groove also includes a second clearance groove (123) located above the positioning groove (122), the radial dimension of the second clearance groove (123) being larger than the radial dimension of the positioning groove (122), and the top end of the pressing member (14) being located inside the second clearance groove (123).

8. The battery cell according to any one of claims 1-3, characterized in that, The pressing member (14) is provided with a first through hole (1411), and at least part of the touch finger (132) passes through the first through hole (1411). And / or, the pressing member (14) includes an annular body (141), the connecting part (131) is sleeved on the annular body (141), one of the outer annular surface of the annular body (141) and the inner annular surface of the connecting part (131) is provided with a protruding part, and the other is provided with a concave part. The protruding part is located in the concave part and can move along the axial direction of the annular body (141).

9. A battery, characterized in that, include: A plurality of battery cells (10) as described in any one of claims 1-8, wherein the plurality of battery cells (10) are arranged in multiple rows; The conductive bus (20) includes a connecting plate (21) and plugs (22) disposed at both ends of the connecting plate (21). The plugs (22) extend into the groove and abut against the contact finger (132) to connect two adjacent battery cells via the bus.

10. An electrical device, characterized in that, Includes the battery as described in claim 9.

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