Battery monomer, battery and electric device

Abstract

The utility model relates to the technical field of batteries, and provides a battery monomer, a battery and a power utilization device, the battery monomer comprises a shell, electrode terminals, a winding battery cell and an adapter, and at least one electrode terminal is mounted on the shell; the winding battery cell is arranged in the shell, the winding battery cell is provided with an isolation region and tabs, the tabs comprise a first tab and a second tab which are opposite in polarity, the first tab, the second tab and the isolation region are all located on the same side of the winding battery cell in the axis direction of the winding battery cell, and the isolation region separates the first tab and the second tab; the tab is connected with the electrode terminal through an adapter, the adapter comprises a first part and a second part, and the first part and the second part are arranged at an interval. According to the battery monomer, the battery and the power utilization device provided by the invention, the space occupancy rate of the tabs can be reduced.

Description

Technical Field

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

[0002] New energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars.

[0003] In the related art, the space occupied by the tabs of the battery cell is large, which reduces the energy density of the battery cell. Utility Model Content

[0004] In view of this, the embodiments of the present application hope to provide a battery cell, a battery and an electrical device that can reduce the space occupied by the tab.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0006] On the one hand, an embodiment of the present application provides a battery cell, which includes a housing, an electrode terminal, a wound cell and an adapter. At least one electrode terminal is installed in the housing. The wound cell is arranged in the housing, and the wound cell has an isolation area and a pole ear. The pole ear includes a first pole ear and a second pole ear with opposite polarities. The first pole ear, the second pole ear and the isolation area are all located on the same side of the wound cell along its axial direction, and the isolation area separates the first pole ear and the second pole ear. The pole ear is connected to the electrode terminal through the adapter, and the adapter includes a first part and a second part, and the first part and the second part are arranged at intervals.

[0007] In the above technical scheme, by arranging the pole ears and the isolation zone on the same side of the wound battery cell along its axial direction, the first pole ear is located on one side of the isolation zone, and the second pole ear is located on the other side of the isolation zone, and the pole ears are connected to the electrode terminals through adapters. On the one hand, arranging the pole ears with opposite polarities on the same side can reduce the space occupancy rate of the pole ears in the outer shell, so that the space occupancy rate of the part of the wound battery cell other than the pole ears is increased, and then the coating width of the active material of the pole sheet is increased, so that not only the charging and discharging performance of the battery cell can be improved, but also the energy density of the battery cell can be improved; on the other hand, arranging the pole ears with opposite polarities on the same side can shorten the current transmission path, thereby reducing the internal resistance and improving the performance and efficiency of the battery cell; on the other hand, arranging the pole ears with opposite polarities on the same side can make it easier to achieve reliable management of the battery cell, so as to better monitor and control the working status of the battery cell; on the other hand, when maintenance is required, the pole ears with opposite polarities are located on the same side, which makes the operation easier.

[0008] In one embodiment, the wound cell is formed with a winding core hole, the first pole ear includes a first main body area and a first bending area, the first part includes a first connection area and a first support area, the first connection area is connected to the first bending area, the first support area is connected to the first main body area, and the first main body area and the first bending area have a height difference along the axis direction of the wound cell;

[0009] The second pole ear includes a second main body area and a second bending area, the second part includes a second connection area and a second support area, the second connection area is connected to the second bending area, the second support area is connected to the second main body area, and the second main body area and the second bending area both have a height difference along the axial direction of the wound battery cell.

[0010] In the above technical solution, by forming the first bending area, the contact area with the first connection area can be increased, and by forming the second bending area, the contact area with the second connection area can be increased, so that the first connection area and the second connection area can be electrically connected. The first main body area and the first bending area have a height difference along the axis direction of the wound battery cell, and the second main body area and the second bending area both have a height difference along the axis direction of the wound battery cell, and the target position faces the side of the electrode terminal, the first connection area is electrically connected to the first bending area, and the second connection area is connected to the second bending area, so that the layout of the first main body area, the first bending area, the first support area and the first connection area, and the second main body area, the second bending area, the second support area and the second connection area is more flexible, and the space is fully utilized. Moreover, the first main body area and the first bending area, the first support area and the first connection area, the second connection area and the second support area, and the second main body area and the second bending area of different sizes along the axis are electrically connected, which can increase the contact area between the tab and the adapter, improve the stability of the connection, and reduce the possibility of the tab and the adapter being loosened or falling off during the operation of the battery cell.

[0011] In one embodiment, the first bending area includes a first gradual change area and a first constant height area, and the first constant height area is located on a side of the first gradual change area away from the winding core hole along the inner and outer directions;

[0012] The second bending area includes a second gradual change area and a second constant height area, and the second constant height area is located on a side of the second gradual change area away from the winding core hole along the inner and outer directions;

[0013] The first gradient zone has a first bending portion, and the second gradient zone has a second bending portion. The dimension of the first bending portion or the second bending portion along the axial direction of the wound battery cell in a non-bending state is a first dimension. The first dimension of the first bending portion and the first dimension of the second bending portion gradually increase from inside to outside, wherein the inside-outside direction is perpendicular to the axial direction of the wound battery cell.

[0014] In the above technical solution, by gradually increasing the first dimension of the first bending portion and the first dimension of the second bending portion, in this way, after the first bending portion of the first gradual change region and the second bending portion of the second gradual change region are bent and flattened from the outside to the inside, the surfaces of the first bending portion and the second bending portion along the axial direction close to the electrode terminal in the bent state will be approximately flat. In this way, it is convenient to weld with the first connection region and the second connection region, and after the first bending portion is bent, it can avoid interfering with the second bending portion to a certain extent, and reduce the occurrence of short circuit caused by the contact between the first bending region and the second bending portion with opposite polarities.

[0015] In one embodiment, the dimension of the first equal-height region or the second equal-height region along the axis direction of the wound battery cell is the second dimension, and the second dimensions of the first equal-height region and the second equal-height region from the inside to the outside are both set to be equal in height.

[0016] In the above technical solution, by setting the second dimensions of the first equal-height region and the second equal-height region from the inside to the outside to be equal, after the first bending portion and the second bending region are bent and flattened, it can be made to spread on the same plane. In this way, it is convenient for the first connection region and the second connection region to be welded to improve the connection strength between the two and reduce the occurrence of detachment or loosening.

[0017] In one embodiment, the first equal-height region has a third bending portion, and the second equal-height region has a fourth bending portion. The dimension of the third bending portion or the fourth bending portion along the axis direction of the wound battery cell in the non-bent state is the third dimension, and the ratio of the third dimension to the second dimension is between 0.5 and 1.

[0018] In the above technical solution, through a suitable ratio, it is not only convenient to flatten the first bending portion and the second bending portion, but also can reduce the occurrence of short circuit due to the overlap of the first bending portion and the second bending portion when the ratio is too large, and the reliability is good.

[0019] In one embodiment, the dimension of the first bending portion or the second bending portion along the inner-outer direction is the fourth dimension, and the fourth dimension is not less than the maximum dimension of the first dimension.

[0020] In the above technical solution, by setting the fourth dimension not less than the maximum dimension of the first dimension, in this way, the first bending portion will not exceed the isolation region and overlap with the second bending portion to cause a short circuit after being bent, and the reliability is good.

[0021] In one embodiment, the slopes of the first bending portion and the second bending portion in the non-bent state are both greater than 0° and less than or equal to 45°.

[0022] In the above technical solution, by setting an appropriate slope, on the one hand, it is possible to reduce the short circuit situation that occurs when the first bent portion is pushed flat and overlaps with the second bent portion, and the reliability is good; on the other hand, it is possible to reduce the situation where the first bent portion and the second bent portion are not in the same plane after bending, increase the welding mark area when welding with the first connection area and the second connection area, and reduce the situation of deteriorating overcurrent temperature rise.

[0023] In one embodiment, the number of the first main body areas and the second main body areas is at least two, and a first bending area is provided between two adjacent first main body areas along the circumferential direction of the core hole, and a second bending area is provided between two adjacent second main body areas along the circumferential direction of the core hole.

[0024] In the above technical solution, when connecting the first bending area with the first connection area and the second bending area with the second connection area, the overcurrent area can be increased, and the overcurrent capacity and heat dissipation capacity of the battery cell can be improved.

[0025] In one embodiment, the first connection area is connected to the first bending area and the second connection area is welded to the second bending area, and the first support area overlaps, welds or is adhesively bonded with the first main body area and the second support area overlaps, welds or is adhesively bonded with the second main body area.

[0026] In the above technical solution, through the connection of the first connection area with the first bending area and the welding of the second connection area with the second bending area, and the overlapping, welding or conductive adhesive bonding of the first support area with the first main body area and the second support area with the second main body area, on the one hand, the connection strength between the adapter and the tab can be improved, the connection stability between the adapter and the tab is good, and the situation of loosening or falling off of the two due to shaking can be reduced; on the other hand, the manufacturing efficiency of the battery cell can be improved.

[0027] In one embodiment, the first connection area is in clearance fit with the first main body area, and the second connection area is in clearance fit with the second main body area.

[0028] In the above technical solution, through the clearance fit, it is convenient to connect and weld the first connection area with the first bending area, and reduce the influence of the tab misalignment caused by die cutting.

[0029] In one embodiment, the battery cell is a cylindrical battery.

[0030] In the above technical solution, the battery cell is a cylindrical battery. On the one hand, the cylindrical battery has a high energy density and can store more electric energy in a smaller volume; on the other hand, the cylindrical battery has a long cycle life and is not prone to capacity attenuation.

[0031] On the other hand, an embodiment of the present application provides a battery, including the battery cell in any one of the above embodiments.

[0032] In the above technical solution, due to the increase in the energy density of the battery cell, the energy density of the corresponding battery is also increased.

[0033] Another aspect of the embodiment of the present application provides an electrical device, including the battery in the above embodiment, for providing electrical energy.

[0034] In the above technical solution, due to the increase in the energy density of the battery, the endurance ability and endurance time of the corresponding electrical device are also increased. Description of the Drawings

[0035] Figure 1 It is a schematic structural diagram of a battery cell provided by an embodiment of the present application;

[0036] Figure 2 It is Figure 1 a schematic structural diagram of the wound battery core in viewed from the perspective of its axis;

[0037] Figure 3 It is Figure 2 a schematic structural diagram of viewed from the R4 perspective, wherein the first bending area and the second bending are in a non-bent state;

[0038] Figure 4 It is Figure 2 a schematic structural diagram of viewed from the R4 perspective, wherein the first bending area and the second bending are in a bent state;

[0039] Figure 5 It is Figure 2 a schematic structural diagram of viewed from the R3 perspective;

[0040] Figure 6 It is Figure 1 a schematic structural diagram of the adapter in ;

[0041] Figure 7 It is Figure 6 a schematic structural diagram from another perspective;

[0042] Figure 8 It is Figure 1 a schematic structural diagram of the first bending area or the second bending area in ;

[0043] Figure 9 It is a schematic structural diagram of a battery provided by another embodiment of the present application;

[0044] Figure 10 It is a schematic structural diagram of a vehicle provided by yet another embodiment of the present application.

[0045] Description of the Reference Numerals

[0046] Vehicle 1000; battery cell 100; wound battery cell 1; tab 11; first tab 111; first main body area 111a; first bending area 111b; first gradient area 111c; first bending part 111d; first equal-height area 111e; third bending part 111f; second tab 112; second main body area 112a; second bending area 112b; second gradient area 112c; second bending part 112d; second equal-height area 112e; fourth bending part 112f; isolation area 12; core hole 12a; adapter 2; first part 21; first connection area 21a; first support area 21b; second part 22; second connection area 22a; second support area 22b; housing 3; target position A; first dimension B; second dimension C; third dimension D; fourth dimension E; slope F; battery 200; box 201; first box 201a; second box 201b; controller 300; motor 400. Detailed implementation

[0047] 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 illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0048] 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 specification and drawings of this application are intended to cover non-exclusive inclusion.

[0049] In the description of the embodiments of the present application, technical terms such as "first", "second", "third", etc. 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, "a plurality of" means two or more, unless otherwise specifically defined.

[0050] Referring to "embodiments" herein means that 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 will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0051] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "fixation" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0052] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0053] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0054] As part of the creative concept of the present application, before describing the embodiments of the present application, it is necessary to reasonably analyze the problem in the related art that the tabs of the battery cells occupy a large space, which reduces the energy density of the battery cells, and obtain the technical solution of the embodiments of the present application.

[0055] In the related art, a battery cell includes a case and a battery cell. The battery cell is arranged in the case. A winding hole is formed in the battery cell. A first pole ear is formed at one axial end of the winding hole. A second pole ear is formed at one axial end of the winding hole. This causes the space occupied by the pole ears in the case to increase, which in turn causes the energy density of the battery cell to decrease.

[0056] If the first pole tab and the second pole tab can be arranged on the same side of the battery cell, the space occupied by the pole tab can be reduced, thereby improving the energy density of the battery cell.

[0057] The solution of the embodiment of the present application can be applied to electrical devices such as automobiles, but is not limited thereto, and can also be applied to energy storage containers, etc. By arranging the wound battery cell 1 in the housing 3, the wound battery cell 1 has an isolation area 12 and a tab 11, and the tab 11 and the isolation area 12 are both located on the same side of the wound battery cell 1, and the isolation area 12 separates the first tab 111 and the second tab 112. The tab 11 is connected to the electrode terminal through the adapter 2.

[0058] In an embodiment of the present application, the battery cell 100 may be a secondary battery, which refers to a battery cell 100 that can be activated by charging after discharging to continue use.

[0059] In an embodiment of the present application, the battery cell 100 may 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., and the embodiments of the present application are not limited thereto.

[0060] One aspect of the embodiments of the present application provides a battery cell. Please refer to Figures 1 to 8 , the battery cell 100 includes a housing 3, electrode terminals, a wound cell 1, and an adapter 2. At least one electrode terminal is installed on the housing 3. The wound cell 1 is disposed within the housing 3. The wound cell 1 has an isolation region 12 and tabs 11. The tabs 11 include a first tab 111 and a second tab 112 with opposite polarities. The first tab 111, the second tab 112, and the isolation region 12 are all located on the same side of the wound cell 1 along its axis direction. The isolation region 12 separates the first tab 111 and the second tab 112. The tabs 11 are connected to the electrode terminals through the adapter 2. The adapter 2 includes a first part 21 and a second part 22, and the first part 21 and the second part 22 are spaced apart.

[0061] Each adapter 2 is respectively connected to the corresponding tab 11 and the corresponding electrode terminal.

[0062] The first tab 111 may be the first tab 111. The second tab 112 may be the second tab 112.

[0063] The housing 3 is used to accommodate the wound cell 1 to provide a certain protection to the wound cell and reduce the risk of damage to the wound cell 1 when it is exposed. In some embodiments, the housing 3 may be a sealed structure or a non-sealed structure. As an example, the battery cell 100 includes an electrode assembly, and the electrode assembly includes a wound cell 1 and an electrolyte. When the housing 3 is a sealed structure, the housing 3 can protect the electrode assembly and prevent, to a certain extent, problems such as electrolyte leakage. When the housing 3 is a non-sealed structure, the housing 3 can protect the electrode assembly. A sealed bag may also be included between the housing 3 and the electrode assembly, and the sealed bag is used to encapsulate the electrode assembly and the electrolyte, etc. Specifically, the sealed bag may be a bag-shaped insulating member or an aluminum-plastic film.

[0064] The adapter 2 is a conductive element used to connect the tabs 11 of the battery cell 100 to the electrode terminals, so as to conduct the electrical energy of the wound cell 1 out through the electrode terminals. The first part 21 is connected to the first tab 111, and the second part 22 is connected to the second tab 112.

[0065] An electrode terminal refers to a component that connects the adapter 2 to an external circuit. For example, the electrode terminal can be a pole column. The number of electrode terminals is at least two. One of the at least two electrode terminals is a positive electrode terminal, and the other of the at least two electrode terminals is a negative electrode terminal. The positive electrode terminal connects the first part 21 and the positive pole of the external circuit, and the negative electrode terminal connects the second part 22 and the negative pole of the external circuit.

[0066] The isolation area 12 refers to an area used to isolate the tabs 11 with opposite polarities, to a certain extent, to avoid the situation of short circuit caused by the contact of the tabs 11 with opposite polarities.

[0067] The battery cell 100 includes an electrolyte, which is located inside the casing 3. The wound electrode core 1 is formed by winding a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet after being stacked. The positive electrode sheet is coated with a positive electrode active material, and the part of the positive electrode sheet not coated with the positive electrode active material forms the first tab 111. Taking a lithium battery as an example, the positive electrode sheet is a metal foil, and the metal foil can be aluminum or stainless steel with silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. The positive electrode active material can be at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material of the battery cell 100 can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of the lithium-containing phosphate may include, but are not limited to, lithium iron phosphate (such as LiFePO4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, a composite material of lithium manganese iron phosphate and carbon, etc. The negative electrode sheet is coated with a negative electrode active material, and the part of the negative electrode sheet not coated with the negative electrode active material forms the second tab 112. The negative electrode sheet can be a metal foil, and the metal foil can be aluminum or stainless steel with silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. The separator can be a separator film. This application does not have special restrictions on the type of the separator film, and any well-known porous structure separator film with good chemical stability and mechanical stability can be selected. For example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The electrolyte plays a role in conducting ions between the positive and negative electrodes. This application does not have specific restrictions on the type of the electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel or solid.

[0068] The battery cell 100 provided by the embodiment of the present application has the tab 11 and the isolation area 12 disposed on the same side of the wound battery core 1 along its axial direction. The first tab 111 is located on one side of the isolation area 12, and the second tab 112 is located on the other side of the isolation area 12. The tab 11 is connected to the electrode terminal through the adapter 2. On the one hand, arranging the tabs 11 with opposite polarities on the same side can reduce the space occupancy rate of the tabs 11 in the housing 3, increase the space occupancy rate of the part of the wound battery core 1 other than the tabs 11, and then increase the coating width of the active material of the electrode sheet. In this way, not only the charge and discharge performance of the battery cell 100 can be improved, but also the energy density of the battery cell 100 can be increased. On the other hand, arranging the tabs 11 with opposite polarities on the same side can shorten the current transmission path, thereby reducing the internal resistance and improving the performance and efficiency of the battery cell 100. On the further hand, arranging the tabs 11 with opposite polarities on the same side can more easily achieve reliable management of the battery cell 100 to better monitor and control the working state of the battery cell 100. On the yet another hand, when maintenance is required, the tabs 11 with opposite polarities being on the same side makes the operation more convenient.

[0069] In one embodiment, please refer to Figures 2 to 5 , the wound battery core 1 is formed with a core hole 12a. The first tab 111 includes a first main body area 111a and a first bending area 111b. The first part 21 includes a first connection area 21a and a first support area 21b. The first connection area 21a is connected to the first bending area 111b, and the first support area 21b is connected to the first main body area 111a. The first main body area 111a and the first bending area 111b have a height difference along the axial direction of the wound battery core 1.

[0070] The second tab 112 includes a second main body area 112a and a second bending area 112b. The second part 22 includes a second connection area 22a2a and a second support area 22b2b. The second connection area 22a is connected to the second bending area 112b, and the second support area 22b is connected to the second main body area 112a. Both the second main body area 112a and the second bending area 112b have a height difference along the axial direction of the wound battery core 1.

[0071] Exemplarily, the winding core hole 12a is formed by winding the positive electrode sheet, the negative electrode sheet, and the separator, and the winding core hole 12a can be formed in the isolation area 12. Exemplarily, the extreme positions of the first main body area 111a and the second main body area 112a along the axis of the wound battery cell 1 toward the side of the electrode terminal are both the target position A. The dimension of the first bending area 111b along the axis direction of the wound battery cell 1 toward the electrode terminal is greater than the dimension of the first main body area 111a, and the dimension of the second bending area 112b along the axis direction of the wound battery cell 1 toward the electrode terminal is greater than the dimension of the second main body area 112a. The first part 21 has a first support area 21b electrically connected to the first main body area 111a and a first connection area 21a electrically connected to the first bending area 111b. That is to say, the dimension of the first support area 21b along the axis direction of the wound battery cell 1 away from the electrode terminal is greater than the dimension of the first connection area 21a; the second part 22 has a second support area 22b electrically connected to the second main body area 112a and a second connection area 22a electrically connected to the second bending area 112b. That is to say, the dimension of the second support area 22b along the axis direction of the wound battery cell 1 away from the electrode terminal is greater than the dimension of the second connection area 22a, so that the shape of the adapter 2 is generally stepped.

[0072] In this way, by forming the first bending area 111b, the contact area with the first connection area 21a can be increased. By forming the second bending area 112b, the contact area with the second connection area 22a can be increased, which is convenient for the electrical connection between the first connection area 21a and the second connection area 22a. Due to the height difference between the first main body area 111a and the first bending area 111b along the axis direction of the wound battery cell 1, and the height difference between the second main body area 112a and the second bending area 112b along the axis direction of the wound battery cell 1, on the side of the target position A toward the electrode terminal, the first connection area 21a is electrically connected to the first bending area 111b, and the second connection area 22a is connected to the second bending area 112b, so that the layout of the first main body area 111a, the first bending area 111b, the first support area 21b, and the first connection area 21a, as well as the second main body area 112a, the second bending area 112b, the second support area 22b, and the second connection area 22a is more flexible, making full use of the space. Moreover, by electrically connecting the first main body area 111a and the first bending area 111b, the first support area 21b and the first connection area 21a, the second connection area 22a and the second support area 22b, and the second main body area 112a and the second bending area 112b with different dimensions along the axis, the contact area between the tab 11 and the adapter 2 can be increased, the connection stability can be improved, and the situation that the tab 11 and the adapter 2 may become loose or fall off during the operation of the battery cell 100 can be reduced.

[0073] It should be noted that Figure 1 in it, R1 can be the axis direction of the wound battery cell 1, and R2 can be the inner - outer direction.Figure 2 R3 in it may be the extending direction of the isolation area 12, and R4 may be the arranging direction of the first tab 111 and the second tab 112.

[0074] Exemplarily, in one embodiment, the shape of the wound battery cell 1 after being unfolded may be a rectangle, a square or other shapes.

[0075] In the related art, the tab 11 after being curled adopts a cutting and flattening process. During cutting, it is easy to introduce metal particles into the core hole 12a, which is likely to cause potential hazards.

[0076] In one embodiment, the positive electrode sheet and the negative electrode sheet are both cut into tabs 11 with different sizes in the axial direction and along the unfolding direction of the wound battery cell 1 at the edges along the axial direction of the wound battery cell 1 before curling. The plurality of tabs 11 are arranged at intervals along the unfolding direction of the wound battery cell 1. After curling, the tabs 11 with opposite polarities are led out from the same side of the core battery cell, and the distance between the tabs 11 along the unfolding direction forms the isolation area 12. In this way, it is not easy to introduce particles into the core hole 12a to reduce potential hazards.

[0077] Exemplarily, in one embodiment, the electrode sheet can be cut into tabs 11 by die cutting.

[0078] Exemplarily, in one embodiment, please refer to Figures 1 to 5 , the dimension of the tab 11 along the axial direction of the wound battery cell 1 towards the electrode terminal is larger than the dimension of the isolation area 12. In this way, when bending in the first bending area 111b and the second bending area 112b, the isolation area 12 can avoid the first bending area 111b and the second bending area 112b, which is convenient for bending.

[0079] In one embodiment, the first connection area 21a is connected to the first bending area 111b, and the second connection area 22a is welded to the second bending area 112b. The first support area 21b is overlapped, welded or adhesively bonded with the first main body area 111a, and the second support area 22b is overlapped, welded or adhesively bonded with the second main body area 112a.

[0080] Exemplarily, the first support area 21b and the first main body area 111a, and the second support area 22b and the second main body area 112a may be lap-connected. The first support area 21b and the first main body area 111a, and the second support area 22b and the second main body area 112a may also be connected by welding. The first support area 21b and the first main body area 111a, and the second support area 22b and the second main body area 112a may also be adhesively bonded by coating with conductive adhesive. The welding method is not limited. For example, it may be laser welding, ultrasonic welding or resistance welding, etc.

[0081] In this way, by connecting the first connection area 21a to the first bending area 111b and welding the second connection area 22a to the second bending area 112b, and by overlapping, welding or adhesively bonding the first support area 21b to the first main body area 111a and the second support area 22b to the second main body area 112a, on the one hand, the connection strength between the adapter 2 and the tab 11 can be improved, the connection stability between the adapter 2 and the tab 11 is good, and the situation of loosening or falling off between the two due to shaking can be reduced; on the other hand, the manufacturing efficiency of the battery cell 100 can be improved.

[0082] In one embodiment, please refer to Figures 1 to 4 , the battery cell 100 is a cylindrical battery. On the one hand, the cylindrical battery has a high energy density and can store more electric energy in a smaller volume; on the other hand, the cylindrical battery has a long cycle life and is not prone to capacity attenuation.

[0083] Exemplarily, in one embodiment, please refer to Figure 1 , the first bending area 111b and the second bending area 112b are bent towards the isolation area 12. In this way, when the first connection area 21a is connected to the first bending area 111b, bending the first bending area 111b towards the isolation area 12 can increase its contact area with the first connection area 21a, which not only facilitates the connection of the first connection area 21a, but also increases the current conduction area due to the increased contact area, reducing the contact resistance. In addition, since it is bent towards the isolation area 12, the isolation area 12 has a large avoidance space along the arrangement direction of the tabs 11 with opposite polarities, so as to reduce the situation of contact short - circuit when the first bending area 111b and the second bending area 112b are bent, and improve the reliability of the battery cell 100.

[0084] In one embodiment, please refer to Figure 1 , the first bending area 111b and the second bending area 112b are bent towards the core hole 12a. In this way, the reliability of the battery cell 100 can be further improved.

[0085] In one embodiment, please refer to Figure 1 , Figure 3 , Figure 4 , Figure 6 and Figure 7 , the number of the first main body areas 111a and the second main body areas 112a is at least two. A first bending area 111b is provided between two adjacent first main body areas 111a along the circumferential direction of the core hole 12a, and a second bending area 112b is provided between two adjacent second main body areas 112a along the circumferential direction of the core hole 12a.

[0086] Exemplarily, a first bending region 111b is provided between two adjacent first main body regions 111a along the circumferential direction of the core hole 12a, and the dimension of the first bending region 111b along the axis of the wound battery cell 1 is lower than that of the first main body region 111a. In this way, the shapes of the first bending region 111b and the two first main body regions 111a are approximately concave, and the first part 21 is correspondingly arranged with the first main body region 111a and the first bending region 111b, so that the shape of the first part 21 is approximately convex. A second bending region 112b is provided between two adjacent second main body regions 112a along the circumferential direction of the core hole 12a, and the dimension of the second bending region 112b along the axis of the wound battery cell 1 is lower than that of the second main body region 112a. In this way, the shapes of the second bending region 112b and the two second main body regions 112a are approximately concave, and the second part 22 is correspondingly arranged with the second main body region 112a and the second bending region 112b, so that the shape of the second part 22 is approximately convex.

[0087] In this way, when connecting the first bending region 111b with the first connection region 21a and the second bending region 112b with the second connection region 22a, the current-carrying area can be increased, and the current-carrying capacity and heat dissipation capacity of the battery cell 100 can be improved.

[0088] Exemplarily, in one embodiment, a first connection region 21a and two first support regions 21b, a second connection region 22a and two second support regions 22b can be formed by respectively stamping the middle parts of the first part 21 and the second part 22.

[0089] It should be noted that the inner and outer directions described here can be the radial direction of the wound hole, and the inner and outer directions are perpendicular to the axis direction of the wound battery cell 1.

[0090] In one embodiment, please refer to Figure 1 , the first connection region 21a is in clearance fit with the first main body region 111a, and the second connection region 22a is in clearance fit with the second main body region 112a. It should be noted that the first bending region 111b is located between the two first main body regions 111a, and the dimension of the first bending region 111b along the axis direction of the wound battery cell 1 is lower than that of the first main body region 111a, so as to form a shape similar to a groove. In this way, through the clearance fit, it is convenient for the first connection region 21a to be connected with the first bending region 111b for welding, and the influence of the misalignment of the tab 11 caused by die cutting is reduced.

[0091] In one embodiment, please refer to Figure 1, on one side of the first support area 21b away from the first main body area 111a along the axis of the wound battery cell 1, it is electrically connected to the corresponding electrode terminal, and on one side of the second support area 22b away from the second main body area 112a along the axis of the wound battery cell 1, it is electrically connected to the corresponding electrode terminal. The number of electrode terminals corresponds one by one to the number of the first support area 21b and the second support area 22b. Exemplarily, two first support areas 21b are formed in the first part 21, two second support areas 22b are formed in the second part 22, four electrode terminals are formed, two positive electrode terminals and two negative electrode terminals. The two positive electrode terminals are connected to the two first support areas 21b of the first part 21, and the two negative electrode terminals are connected to the two second support areas 22b of the second part 22. One positive electrode terminal and one negative electrode terminal are a pair of connection terminals. When connecting to the positive and negative poles of the external circuit, it can be connected to a pair of connection terminals, and the other pair of connection terminals can be reserved. In some other embodiments, when connecting to the positive and negative poles of the external circuit, the positive and negative poles of the external circuit can be respectively connected to the corresponding two pairs of connection terminals. That is to say, the positive pole of the external circuit can be connected to the two positive electrode terminals, and the negative pole can be connected to the two negative electrode terminals to improve the over-current capacity.

[0092] In one embodiment, please refer to Figure 8 , the first bending area 111b includes a first gradual change area 111c and a first equal height area 111e. The first equal height area 111e is located on the side of the first gradual change area 111c away from the core hole 12a along the inner and outer direction.

[0093] The second bending area 112b includes a second gradual change area 112c and a second equal height area 112e. The second equal height area 112e is located on the side of the second gradual change area 112c away from the core hole 12a along the inner and outer direction.

[0094] The first gradual change area 111c has a first bending part 111d, the second gradual change area 112c has a second bending part 112d. The dimension of the first bending part 111d or the second bending part 112d in the axial direction of the wound battery cell 1 in the non-bending state is the first dimension B. The first dimension B of the first bending part 111d and the first dimension B of the second bending part 112d gradually increase from the inside to the outside, wherein the inner and outer direction is perpendicular to the axial direction of the wound battery cell 1.

[0095] Here, by gradually increasing the first dimension B of the first bending portion 111d and the first dimension B of the second bending portion 112d, after bending and flattening the first bending portion 111d of the first tapered region 111c and the second bending portion 112d of the second tapered region 112c from the outside to the inside, the surfaces of the first bending portion 111d and the second bending portion 112d that are axially close to the electrode terminal in the bent state will generally tend to be flat. In this way, it is convenient to weld with the first connection region 21a and the second connection region 22a, and after the first bending portion is bent, it can avoid interfering with the second bending portion 112d to a certain extent, reducing the occurrence of short circuits caused by the contact between the first bending region 111b and the second bending portion 112d with opposite polarities.

[0096] In one embodiment, please refer to Figure 8 , the dimension of the first equal-height region 111e or the second equal-height region 112e along the axis direction of the wound battery cell 1 is the second dimension C, and the second dimension CD of the first equal-height region 111e and the second dimension CD of the second equal-height region 112e are both set to be equal in height from the inside to the outside.

[0097] Here, by setting the second dimension CD of the first equal-height region 111e and the second dimension CD of the second equal-height region 112e to be equal from the inside to the outside, after the first bending portion 111d and the second bending region 112b are bent and flattened, they can be spread on the same plane. In this way, it is convenient for the first connection region 21a and the second connection region 22a to be welded to improve the connection strength between the two and reduce the occurrence of detachment or loosening.

[0098] In one embodiment, please refer to Figure 8 , the first equal-height region 111e has a third bending portion 111f, the second equal-height region 112e has a fourth bending portion 112f, the dimension of the third bending portion 111f or the fourth bending portion 112f along the axis direction of the wound battery cell 1 in the non-bent state is the third dimension DC, and the ratio of the third dimension DC to the second dimension CD is between 0.5 and 1.

[0099] Exemplarily, the ratio of the third dimension D to the second dimension D can be 0.5, 0.55, 0.6, 0.65, 0.75, 0.8, 0.85, 0.9 or 1, etc. With a suitable ratio, it is not only convenient to flatten the first bending portion 111d and the second bending portion 112d, but also can reduce the occurrence of short circuits due to the overlap of the first bending portion 111d and the second bending portion 112d when the ratio is too large, and the reliability is good.

[0100] In one embodiment, please refer to Figure 8 , the dimension of the first bending portion 111d or the second bending portion 112d along the inside-outside direction is the fourth dimension E, and the fourth dimension E is not less than the maximum dimension of the first dimension B.

[0101] Here, by setting the fourth dimension E to be not less than the maximum dimension of the first dimension B, in this way, after the first bending part 111d is bent, it will not exceed the isolation area 12 and overlap and short-circuit with the second bending part, and the reliability is good.

[0102] In one embodiment, please refer to Figure 8 , the slopes F of the first bending part 111d and the second bending part 112d in the non-bent state are both greater than 0° and less than or equal to 45°.

[0103] Exemplarily, taking the first bending part 111d as an example, the slope F of the first bending part 111d in the non-bent state can be 1°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40° or 45°, etc. In this way, by setting an appropriate slope F, on the one hand, the situation of overlap and short-circuit between the first bending part 111d and the second bending part 112d after the first bending part 111d is bent and flattened can be reduced, and the reliability is good; on the other hand, the situation that the first bending part 111d and the second bending part 112d are not in the same plane after bending can be reduced, the welding mark area during welding with the first connection area 21a and the second connection area 22a can be increased, and the situation of deteriorating overcurrent temperature rise can be reduced.

[0104] It should be noted that the slope F described here refers to the elevation angle of the first bending part 111d or the second bending part 112d.

[0105] On the other hand, a battery 200 provided by an embodiment of the present application includes the battery cell 100 in any one of the above embodiments. Due to the increase in the energy density of the battery cell 100, the energy density of the corresponding battery 200 is also increased.

[0106] In one embodiment, the number of battery cells 100 is at least two, and the battery 200 includes a bus bar, and the bus bar connects the electrode terminals of at least two battery cells 100. In this way, the energy density of the battery 200 can be further increased. In some embodiments, please refer to Figure 4 , the battery 200 includes a box body 201, the box body 201 includes a first box body 201a and a second box body 201b, the first box body 201a and the second box body 201b are buckled, so that a closed space is formed inside the box body 201 to accommodate the battery cell 100 to protect the battery cell 100. The "closed" here means covering or closing, which can be sealed or non-sealed. The first box body 201a can be a top cover or a bottom plate.

[0107] On yet another aspect, an electrical device provided by an embodiment of the present application includes the battery 200 in the above embodiment, and the battery 200 is used to provide electrical energy. Due to the increase in the energy density of the battery 200, the endurance and endurance time of the corresponding electrical device are also increased.

[0108] An electrical device is a device that uses electrical energy as an energy source and realizes corresponding functions by consuming electrical energy. Exemplarily, the electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy. For example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0109] In the electrical device according to an embodiment of the present application, the electrical device may include a device main body and a power supply device. The power supply device is used to supply power to the device main body, and the power supply device may include a battery 200.

[0110] The device main body refers to the main structure that consumes electrical energy to realize corresponding functions. For example, if the electrical device is a mobile phone, the device main body is the part that can realize functions such as communication, and the battery 200 supplies power to the part that can realize functions such as communication. For example, if the electrical device is a car, the device main body is the part for people to ride and can travel on the road, and the battery 200 supplies power to the part for people to ride and can travel on the road.

[0111] The power supply device refers to a device that can output electrical energy. Exemplarily, electrical energy can be output through the battery 200.

[0112] Taking the electrical device of a vehicle 1000 according to an embodiment of the present application as an example for illustration, please refer to Figure 10 .

[0113] The vehicle 1000 provided by an embodiment of the present application can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. As Figure 10 shown, a battery 200 is provided inside the vehicle 1000. The battery 200 can be provided at the bottom, head or tail of the vehicle 1000. The battery 200 can be used to supply power to the vehicle 1000. For example, the battery 200 can be used as the operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 300 and a motor 400. The controller 300 can be used to control the battery 200 to supply power to the motor 400. For example, the battery 200 can be used for the working power requirements during the start, navigation and driving of the vehicle 1000.

[0114] The battery cell 100 provided by the embodiment of the present application, please refer to Figures 1 to 8The battery cell 100 is a cylindrical battery. The battery cell 100 includes a shell 3, an electrode terminal, a wound battery cell 1 and a converter 2. At least one electrode terminal is installed on the shell 3. The wound battery cell 1 is arranged in the shell 3. The wound battery cell 1 has an isolation area 12, a first pole ear 11111 and a second pole ear 11211. The isolation area 12, the first pole ear 11111 and the second pole ear 11211 are all located on the same side of the wound battery cell 1 along its axial direction. The isolation area 12 separates the first pole ear 11111 and the second pole ear 11211. The wound battery cell 1 is formed with a winding core hole 12a. The first pole ear 11111 includes a first main body area 111a and a first bending area 111b. The first part 21 includes a first main body area 111a and a first bending area 111b. A connecting area 21a and a first supporting area 21b, the first connecting area 21a is connected to the first bending area 111b, the first supporting area 21b is connected to the first main area 111a, and the first main area 111a and the first bending area 111b have a height difference along the axial direction of the wound battery cell 1; the second pole ear 11211 includes a second main area 112a and a second bending area 112b, the second part 22 includes a second connecting area 22a and a second supporting area 22b, the second connecting area 22a is connected to the second bending area 112b, the second supporting area 22b is connected to the second main area 112a, and the second main area 112a and the second bending area 112b both have a height difference along the axial direction of the wound battery cell 1. The first bending area 111b includes a first gradient area 111c and a first contour area 111e, the first contour area 111e is located on the side of the first gradient area 111c away from the winding core hole 12a along the inner and outer directions, the second bending area 112b includes a second gradient area 112c and a second contour area 112e, the second contour area 112e is located on the side of the second gradient area 112c away from the winding core hole 12a along the inner and outer directions, the first gradient area 111c has a first bending portion 111d, the second gradient area 112c has a second bending portion 112d, the first bending portion 111d or the second bending portion 111d The dimension of the bend 112d along the axis direction of the wound battery cell 1 in the non-bending state is the first dimension B, and the first dimension B of the first bend 111d and the first dimension B of the second bend 112d gradually increase from the inside to the outside, wherein the inside-outside direction is perpendicular to the axis direction of the wound battery cell 1, specifically, the first connection area 21a is connected to the first bend area 111b and the second connection area 22a is welded to the second bend area 112b, the first support area 21b is overlapped, welded or conductively glued to the first main body area 111a and the second support area 22b is overlapped, welded or conductively glued to the second main body area 112a. The number of the first main body area 111a and the second main body area 112a is at least two, and a first bend area 111b is provided between two adjacent first main body areas 111a along the circumference of the winding core hole 12a, and a second bend area 112b is provided between two adjacent second main body areas 112a along the circumference of the winding core hole 12a.The dimension of the first equal-height area 111e or the second equal-height area 112e in the axial direction of the wound battery cell 1 is the second dimension C. The second dimension C of the first equal-height area 111e and the second dimension C of the second equal-height area 112e are both set at the same height from the inside to the outside. The first equal-height area 111e has a third bending portion 111f, and the second equal-height area 112e has a fourth bending portion 112f. The dimension of the third bending portion 111f or the fourth bending portion 112f in the axial direction of the wound battery cell 1 in the non-bent state is the third dimension D. The ratio of the second dimension C to the third dimension D is between 0.5 and 1. The dimension of the first bending portion 111d or the second bending portion 112d in the inner-outer direction is the fourth dimension E. The fourth dimension E is not less than the maximum dimension of the first dimension B. The slopes F of the first bending portion 111d and the second bending portion 112d in the non-bent state are both greater than 0° and less than or equal to 45°.

[0115] As mentioned above, the above is only a preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present application are all included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that, include: shell; an electrode terminal, at least one electrode terminal being mounted on the housing; A wound battery cell is arranged in the housing, the wound battery cell has an isolation area and pole ears, the pole ears include a first pole ear and a second pole ear with opposite polarities, the first pole ear, the second pole ear and the isolation area are all located on the same side of the wound battery cell along the axis direction thereof, and the isolation area separates the first pole ear and the second pole ear; A transition piece, the tab is connected to the electrode terminal through the transition piece, the transition piece comprises a first part and a second part, the first part and the second part are arranged at an interval.

2. The battery cell according to claim 1, characterized in that, The wound cell is formed with a winding core hole, the first pole ear includes a first main body area and a first bending area, the first part includes a first connection area and a first support area, the first connection area is connected to the first bending area, the first support area is connected to the first main body area, and the first main body area and the first bending area have a height difference along the axis direction of the wound cell; The second pole ear includes a second main body area and a second bending area, the second part includes a second connection area and a second support area, the second connection area is connected to the second bending area, the second support area is connected to the second main body area, and the second main body area and the second bending area both have a height difference along the axial direction of the wound battery cell.

3. The battery cell according to claim 2, wherein, The first bending area includes a first gradual change area and a first constant height area, and the first constant height area is located on a side of the first gradual change area away from the winding core hole along the inner and outer directions; The second bending area includes a second gradient area and a second contour area, and the second contour area is located on a side of the second gradient area away from the winding core hole along the inner and outer directions; The first gradient zone has a first bending portion, and the second gradient zone has a second bending portion. The dimension of the first bending portion or the second bending portion along the axial direction of the wound battery cell in a non-bending state is a first dimension. The first dimension of the first bending portion and the first dimension of the second bending portion gradually increase from inside to outside, wherein the inside-outside direction is perpendicular to the axial direction of the wound battery cell.

4. The battery cell according to claim 3, characterized in that The dimension of the first contour area or the second contour area along the axis direction of the wound battery core is the second dimension, and the second dimension of the first contour area and the second dimension of the second contour area are arranged at the same height from inside to outside.

5. The battery cell according to claim 4, characterized in that, The first contour area has a third bending portion, and the second contour area has a fourth bending portion. The dimension of the third bending portion or the fourth bending portion along the axial direction of the wound battery cell in a non-bending state is a third dimension, and the ratio of the third dimension to the second dimension is between 0.5 and 1.

6. The battery cell according to claim 3, wherein, A dimension of the first bending portion or the second bending portion along the inner and outer directions is a fourth dimension, and the fourth dimension is not less than a maximum dimension of the first dimension.

7. The battery cell according to claim 3, characterized in that, The slopes of the first bending portion and the second bending portion in a non-bending state are both greater than 0° and less than or equal to 45°.

8. The battery cell according to claim 2, characterized in that, The number of the first main body regions and the second main body regions is at least two. The first bending region is arranged between two adjacent first main body regions along the circumferential direction of the core hole, and the second bending region is arranged between two adjacent second main body regions along the circumferential direction of the core hole.

9. The battery cell according to claim 2, wherein, The first connection region is connected to the first bending region, and the second connection region is welded to the second bending region. The first support region is lapped, welded or adhesively bonded with conductive adhesive to the first main body region, and the second support region is lapped, welded or adhesively bonded with conductive adhesive to the second main body region.

10. The battery cell according to claim 2, wherein The first connection region is in clearance fit with the first main body region, and the second connection region is in clearance fit with the second main body region.

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

12. A battery, characterized in that, It includes the battery cell according to any one of claims 1 to 11.

13. An electrical device, characterized in that, It includes the battery according to claim 12, which is used to provide electric energy.

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