Battery cell assembly and battery

Abstract

The utility model discloses a battery cell assembly and a battery, the battery cell assembly comprises a battery cell and an electrode adapter, the electrode adapter comprises a first body part and a first bending part formed by bending; the battery cell comprises a battery cell body, the battery cell body comprises a first pole piece, a second pole piece and a diaphragm located between the first pole piece and the second pole piece, and the edge of one side of the first pole piece and the edge of one side of the second pole piece extend outwards to form sub-tabs; the diaphragm comprises a diaphragm covering area extending out of the edge of the first pole piece, the sub-tab extends to the outer side of the diaphragm covering area, the sub-tab comprises a connecting part connected with the battery cell body and a second bending part which is electrically connected with the first bending part and is formed by bending, and in the length direction of the battery cell body, the second bending part is electrically connected with the second bending part. An intersection point between the connecting part and the second bending part is positioned on one side, deviating from the battery cell body, of the diaphragm covering area. By limiting the position of the second bending point of the sub-tab on the tab, the tab does not exceed the thickness of the battery cell body after being bent.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cell assembly and a battery. Background Technology

[0002] Lithium-ion batteries have become one of the most widely used batteries in consumer electronics products due to their advantages such as high energy density, rechargeability, and zero pollution. With the diversified development of the consumer market, lithium-ion batteries have gradually evolved into lightweight, small-volume, and thinner thin batteries.

[0003] Soft-pack batteries are one of the mainstream battery packaging methods today. They involve welding soft and hard tabs together, and then encapsulating the battery cell in a casing formed by stamping aluminum-plastic film. To save space at the top of the battery and reduce the overall size of the cell, the soft and hard tabs are usually bent before being packaged.

[0004] However, conventional tab bending methods do not have clear restrictions on the bending position of the soft tab, resulting in a large bending radius for the soft tab. When manufacturing thin batteries, there is a high risk that the overall thickness of the soft tab and hard tab after bending will exceed the thickness of the battery cell. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a battery cell assembly in which the junction of the connecting portion of the sub-tab and the second bending portion is positioned outside the diaphragm coverage area. By limiting the bending position of the second bending portion on the sub-tab, the bending radius of the sub-tab can be reduced, ensuring that the bent portion does not exceed the thickness of the battery cell body.

[0006] According to an embodiment of the present invention, a battery cell assembly includes a battery cell and an electrode adapter. The electrode adapter includes a first body portion and a first bent portion formed by bending. The battery cell includes a battery cell body, which includes a first electrode, a second electrode, and a separator located between the first electrode and the second electrode. A sub-electrode tab extends outward from one edge of the first electrode and the second electrode. The separator includes a separator covering area extending beyond the edge of the first electrode. The sub-electrode tab extends to the outside of the separator covering area. The sub-electrode tab includes a connecting portion connected to the battery cell body and a second bent portion electrically connected to the first bent portion. In the length direction of the battery cell body, the intersection point between the connecting portion and the second bent portion is located on the side of the separator covering area away from the battery cell body.

[0007] The battery cell assembly of this utility model limits the bending position of the second bending part on the sub-electrode by placing the intersection of the connecting part of the sub-electrode and the second bending part outside the diaphragm coverage area, thereby reducing the bending radius of the sub-electrode and ensuring that the thickness of the battery cell body does not exceed the thickness of the sub-electrode after bending.

[0008] In some embodiments, the electrode adapter has a first bending point, the sub-tab has a second bending point, the distance between the projections of the first bending point and the second bending point in a first reference plane does not exceed the thickness of the cell body, and the first reference plane is parallel to the thickness direction of the cell body.

[0009] The distance between the projections of the first bending point and the second bending point onto the thickness plane of the battery cell body is limited so that the electrode adapter does not exceed the thickness of the battery cell body after bending.

[0010] In some embodiments, the projection of the first bending point onto the second reference plane lies between the cell body and the projection of the second bending point onto the second reference plane, and the second reference plane is parallel to one side surface of the cell body along the thickness direction. This restricts the position of the first bending portion along the length direction of the cell, placing it between the second bending portion and the cell body, thus fully utilizing the head space of the cell body and facilitating battery packaging.

[0011] In some embodiments, the second bent portion is welded to the first bent portion, and the angle between the welding surfaces of the second bent portion and the first bent portion and the second reference surface does not exceed 90°. By tilting the welding plane between the second bent portion and the first bent portion, the position of the first bent portion is further restricted, not exceeding the position of the second bent portion in the length direction of the cell, forming a folded structure, which is beneficial for making full use of the space at the head of the cell body.

[0012] In some embodiments, the first bending point coincides with the projection of the diaphragm covering area onto a first reference plane. This ensures that the first bending point does not extend beyond the diaphragm covering area, facilitating encapsulation.

[0013] In some embodiments, the first bent portion is spaced apart from the cell body. This reduces the possibility of damage to the cell body due to direct contact between the electrode adapter and the cell body.

[0014] The battery cell body includes a plurality of sub-tabs. All the sub-tabs are stacked along the thickness direction of the battery cell and then converge to form a converged section. At least a portion of the converged section is bent to form a second bent portion.

[0015] According to some embodiments of the present invention, the end of the collecting section near the diaphragm-covered area has a first distance D1 with the diaphragm-covered area in a first direction, where 0.1mm ≤ D1 ≤ 2.8mm. The first distance D1 prevents the end of the collecting section near the diaphragm-covered area from interfering with the diaphragm-covered area.

[0016] According to some embodiments of this utility model, in the direction away from the diaphragm-covered area along the first direction, the end of the collecting section near the diaphragm-covered area and the electrode adapter have a second distance D2 in the first direction, where 0.1mm ≤ D2 ≤ 2.8mm. The second distance D2 allows for a margin for bending the sub-electrode tab.

[0017] According to some embodiments of this utility model, the second bending point is spaced apart from the end of the collecting section near the diaphragm coverage area. This restricts the bending position of the second bending portion, improving the gathering effect on multi-layered sub-electrode tabs and reducing delamination after the second bending of the tabs.

[0018] In some embodiments, the third distance between the second bending point and the end of the collecting segment near the diaphragm coverage area is less than the fourth distance between the second bending point and the first bending point. Limiting the third distance to be less than the fourth distance is achieved by controlling the position of the end of the collecting segment near the diaphragm coverage area, thus limiting the position of the bending point of the sub-tab, and controlling the distance between the projections of the first bending point and the second bending point onto the first reference plane.

[0019] In some embodiments, the second bending point coincides with the end of the collecting section near the diaphragm coverage area. Performing a second bend at the end of the collecting section near the diaphragm coverage area is simple, quick, and convenient, and provides good folding effect for stacked multi-layered sub-electrode tabs.

[0020] This utility model embodiment also provides a battery, including a housing assembly and the aforementioned cell assembly. Because of the cell assembly of this utility model, when the cell assembly is encapsulated within the housing assembly, the electrode adapter does not extend beyond the sidewall of the cell body, resulting in good assembly performance.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0022] In this invention, a converging section is provided on the tab at one end near the diaphragm coverage area. The position of the second bending part on the tab is restricted by the converging section at the end near the diaphragm coverage area, and the distance between the projections of the first bending point and the second bending point in the thickness plane of the cell body is limited, so that the electrode adapter does not exceed the thickness of the cell body after bending, thus satisfying the cell structure rule that the electrode does not exceed the thickness of the cell body after bending. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is a schematic diagram of the battery cell structure according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the processing of the collecting section on the sub-pole tab of the battery cell according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the electrode adapter after the first bend according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the welding of an electrode adapter with a first bend and a sub-electrode without a second bend, according to an embodiment of the present invention.

[0028] Figure 5 This is a schematic diagram of the structure of the converging section near the diaphragm coverage area coinciding with the second bending point in an embodiment of this utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the converging section near the diaphragm coverage area and the second bending point, which are spaced apart according to an embodiment of the present invention.

[0030] Figure label:

[0031] 11-Cell body; 111-Separator covered area; 12-Sub-electrode tab; 121-Collision section; 122-Second bend;

[0032] 2-Electrode adapter; 21-First body part; 22-First bending part. Detailed Implementation

[0033] The embodiments of this utility model 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 elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] Lithium-ion batteries have become one of the most widely used batteries in consumer electronics products due to their advantages such as high energy density, rechargeability, and zero pollution. With the diversified development of the consumer market, lithium-ion batteries have gradually evolved into lightweight, small-volume, and thinner thin batteries.

[0035] Soft-pack batteries are one of the mainstream battery packaging methods today. They involve welding soft and hard tabs together before encapsulating the battery cell in a film shell formed by stamping aluminum-plastic film. To save space at the top of the battery and reduce the overall size of the cell, the welding point between the soft and hard tabs is usually bent twice before being packaged into the shell.

[0036] To avoid membrane bulges that could affect battery thickness, the tabs are generally not allowed to be bent beyond the thickness of the cell body. However, as the thickness of thin batteries becomes smaller and smaller, this rule of ensuring that the tabs do not exceed the thickness of the cell body after bending has become difficult to meet.

[0037] In view of this, the present invention provides a cell assembly and a battery, which limits the position of the second bending point on the tab and the projection distance of the two bending points in the thickness direction of the cell body, so that the tab does not exceed the thickness of the cell body after bending.

[0038] In the description of this utility model, the first reference plane and the second reference plane are defined as: reference Figure 1 When the battery cell is placed horizontally, its thickness direction corresponds to its left and right sides; that is, the first reference surface is parallel to these left and right sides. The second reference surface can be a surface parallel to one side of the battery cell along its thickness direction. Figure 1 At this point, the second reference plane can be the upper surface of the battery cell body. Additionally, the first direction can be the length direction of the battery cell body at this time.

[0039] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] The following is for reference. Figures 1 to 6 This invention describes a battery cell assembly according to a first aspect of the present invention.

[0041] refer to Figures 1 to 3 This utility model discloses a battery cell assembly, which can be used in a battery. The battery cell assembly may include a battery cell and an electrode adapter 2.

[0042] The battery cell may include a cell body 11, which may include a first electrode, a second electrode, and a separator. The separator may be located between the first and second electrodes. The first electrode may be a positive electrode, and the second electrode may be a negative electrode. The positive electrode, separator, and negative electrode are stacked sequentially. For safety and to simplify the assembly process, the circumferential edge dimension of the negative electrode is generally larger than that of the positive electrode. The separator may extend along a first direction to form a separator coverage area 111 at the edge of the first electrode. The first direction may be parallel to the length direction of the cell body 11. Here, the separator coverage area refers to the area covered by the separator of the battery cell. The separator coverage area 111 serves to insulate and control ion transport. The first and second electrodes extend along the first direction to form a sub-tab 12. For example, the sub-tab 12 may include a positive sub-tab extending from the first electrode, which is the positive electrode, and a negative sub-tab extending from the second electrode, which is the negative electrode. The sub-tab 12 can have good bending performance to meet the deformation requirements when assembling the cell into the interior of batteries with different structures, while maintaining the stability of the electrical conduction path.

[0043] The electrode adapter 2 may include a first body portion 21 and a first bent portion 22. The sub-tab 12 may include a connecting portion and a second bent portion 122. The connecting portion extends through to the outside of the diaphragm covering area 111. The intersection of the connecting portion and the second bent portion 122 is located on the side of the diaphragm covering area 111 away from the cell body 11. The second bent portion 122 is electrically connected to the first bent portion 22. One end of the first body portion 21 is connected to the first bent portion, and the other end extends along the length of the cell body 11 and is connected to an external circuit. The electrode adapter 2 may be a thick metal conductor with good support performance, capable of withstanding large mechanical stress and high current flow, suitable for applications requiring high power output. Through the electrical connection between the sub-tab 12 and the electrode adapter 2, the sub-tab 12 provides a connection to the inside of the cell body 11, and the electrode adapter 2 acts as a transition to ensure a stable connection to the external circuit. The electrode adapter 2 may have a first bending point, and the sub-electrode 12 may have a second bending point. In other words, the electrode adapter 2 is bent at the first bending point to form a first body part 21 and a first bent part 22, and the sub-electrode 12 is bent at the second bending point to form a connecting part and a second bent part 122.

[0044] In this embodiment, the junction of the connecting part of the sub-tab and the second bending part 122 is set outside the diaphragm coverage area, which limits the bending position of the second bending part 122 on the sub-tab 12. This can reduce the bending radius of the sub-tab 12, so that the sub-tab 12 does not exceed the thickness of the cell body 11 after bending, thereby satisfying the cell structure rule that the sub-tab 12 does not exceed the thickness of the cell body 11 after bending.

[0045] Continue to refer to Figure 2 and Figure 3 Furthermore, the first electrode, second electrode, and separator of the battery cell body 11 can be configured as a multi-layer structure. Positive and negative electrode tabs extend from the multi-layer first and second electrode sheets, respectively. The multi-layer positive electrode tabs are stacked and converged along the thickness direction of the battery cell to form a positive electrode convergence section, and the multi-layer negative electrode tabs are stacked and converged along the thickness direction of the battery cell to form a negative electrode convergence section. The multi-layer electrode tabs are converged to facilitate the electrical connection between the electrode tab 12 and the electrode adapter 2, and when the electrode tab 12 is bent a second time, it helps to reduce the bending radius at the bending point of the electrode tab 12.

[0046] The converging section 121 can be formed by pressing stacked identical polarity sub-tabs 12 with an applying device. For example, the applying device may include an upper pressing block and a lower pressing block, with the stacked identical polarity sub-tabs 12 sandwiched between the upper and lower pressing blocks. One of the upper and lower pressing blocks acts as a support, while the other applies pressure to press the connecting portion of the stacked identical polarity sub-tabs 12 away from the cell body 11 into a single unit. At this time, the plastic deformation area formed by the overlapping and pressing of the upper pressing block, the stacked identical polarity sub-tabs 12, and the lower pressing block is the converging section 121. The converging section 121 has good bending performance to adapt to the deformation of the battery under different shapes and facilitates connection with the electrode adapter 2. After the pressing process, the aggregation effect of the stacked identical polarity sub-tabs 12 is improved. At the same time, the pressing process makes the second bending operation on the sub-tabs 12 more convenient.

[0047] Furthermore, the second bending portion 122 is formed by bending the converging section 121 of the sub-tab 12 during the bending process. The distance between the projections of the first bending point and the second bending point in the first reference plane does not exceed the thickness of the cell body 11. In other words, the distance between the projections of the bending point of the electrode adapter 2 and the bending point of the sub-tab 12 in the first reference plane does not exceed the thickness of the cell body 11. Here, the first reference plane can be parallel to the thickness direction of the cell body 11. For example, the distance between the projections of the first bending point and the second bending point in the first reference plane can be less than the thickness of the cell body 11; or, the distance between the projections of the first bending point and the second bending point in the first reference plane can also be equal to the thickness of the cell body 11. By limiting the position of the second bending point on the sub-tab 12 and the projection distance of the bending points of the two bends in the thickness direction of the cell body 11, the sub-tab 12 is bent so that it does not exceed the thickness of the cell body 11, thus satisfying the cell structure rule that the sub-tab 12 does not exceed the thickness of the cell body 11 after bending. This helps to reduce the space occupied by the tabs at the top of the battery, improve the utilization rate of the internal space of the battery, and thus increase the energy density of the battery.

[0048] In the description of this utility model, "multiple" means two or more.

[0049] refer to Figure 3 and Figure 4 According to some embodiments of the present invention, in the first direction, the end of the collecting segment 121 near the diaphragm covering area 111 and the end of the diaphragm covering area 111 away from the cell body 11 have a first distance D1, 0.1mm≤D1≤2.8mm. Along the length of the cell body 11, there is a first gap D1 between the converging section 121 and the outermost edge of the diaphragm covering area 111 away from the cell body 11. For example, the first gap D1 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, or 2.8mm, to ensure that there is no interference between the cell body 111 and the diaphragm covering area 111 during the pressing process.

[0050] Continue to refer to Figure 3 According to some embodiments of the present invention, in the direction away from the diaphragm covering area 111 along the first direction, the end of the collecting section 121 near the diaphragm covering area 111 and the electrode adapter 2 may have a second distance D2 in the first direction, 0.1mm≤D2≤2.8mm.

[0051] After the first bend on the electrode adapter 2 and before the second bend on the collecting section 121, the second gap D2 at this time refers to the distance between the end of the electrode adapter 2 near the diaphragm covering area 111 and the end of the collecting section 121 near the diaphragm covering area 111. Figure 3 The converging section 121 indicated in the diagram refers to the end of the converging section 121 near the diaphragm coverage area 111. For example, the second spacing D2 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, or 2.8mm. The second spacing D2 reserves the position for the bending point of the second bending portion 122, facilitating processing.

[0052] refer to Figure 5According to some embodiments of this utility model, at least a portion of the collecting section 121 is bent to form a second bent portion 122, which may include: the second bending point coincides with one end of the collecting section 121 near the diaphragm covering area 111. In other words, the bending point of the sub-electrode tab 12 coincides with one end of the collecting section 121 near the diaphragm covering area 111, at which point the collecting section 121 constitutes the second bent portion 122. That is to say, in this embodiment, the first bend can be performed on the electrode adapter 2, and then the second bend can be performed directly at one end of the collecting section 121 near the diaphragm covering area. This is simple, quick, and convenient to operate, and has a good gathering effect on the multi-layer sub-electrode tabs arranged in layers.

[0053] refer to Figure 6 According to some embodiments of this utility model, at least a portion of the collecting section 121 is bent to form a second bent portion 122. Alternatively, the second bent point may be spaced apart from one end of the collecting section 121 near the diaphragm covering area 111. In other words, the bent portion of the sub-electrode 12 is spaced apart from one end of the collecting section 121 near the diaphragm covering area 111. In this case, the bent portion of the sub-electrode 12 is located within the collecting section 121, a portion of the length of the collecting section 121 forms the second bent portion 122, and the other portion is connected to the connecting portion and extends along the first direction. Limiting the position of the second bent point ensures that it is not within the diaphragm covering area 111, improving the gathering effect on the stacked sub-electrode 12, and reducing delamination after the second bend of the sub-electrode 12.

[0054] Continue to refer to Figure 6 According to a further embodiment of the present invention, there is a third distance between the second bending point and the end of the converging section 121 near the diaphragm covering area 111, and a fourth distance between the second bending point and the first bending point, wherein the third distance is smaller than the fourth distance. In this embodiment, the sub-tab 12, as a multi-layered metal structure with stacked arrangement, controls the bending radius at the crease of the second bending portion 122 by limiting the distance of the third distance to be smaller than the fourth distance, thereby improving the gathering effect on the sub-tab 12. Simultaneously, by controlling the position of the converging section 121, the position of the bending point of the sub-tab 12 is limited, thereby controlling the distance between the projections of the first bending point and the second bending point in the first reference plane to meet the cell structure rules. Furthermore, it can also reduce the stress concentration generated at the welding point between the sub-tab 12 and the electrode adapter 2 during the second bending, reducing the impact on the structure.

[0055] Continue to refer to Figure 5 and Figure 6According to some embodiments of the present invention, in the second reference plane, the second reference plane can be parallel to one side surface of the cell body 11 along the thickness direction. For example, the second reference plane can be the upper surface of the cell body 11. The projection of the first bending portion 22 is located between the projections of the cell body 11 and the second bending portion 122. At this time, in the length direction of the cell, the first bending portion 22 is located between the second bending portion 122 and the cell body 11, forming a folded structure so as to make full use of the head space of the cell body 11.

[0056] According to a further embodiment of the present invention, the second bending portion 122 is welded to the first bending portion 22. The angle between the welding surfaces of the second bending portion 122 and the first bending portion 22 and the second reference surface does not exceed 90°, that is, the angle between the welding surface and the upper end surface of the cell body 11 does not exceed 90°. This makes the welding surface tilted from top to bottom away from the cell body 11, further restricting the position of the first bending point. The position of the first bending point does not exceed the position of the second bending portion 122 in the length direction of the cell, forming a folded structure. This is beneficial for making full use of the space at the head of the battery, facilitating battery packaging, and also improving the utilization rate of the internal space of the battery and increasing the energy density.

[0057] Continue to refer to Figure 5 and Figure 6 According to some embodiments of the present invention, the first bending point coincides with the projection of the separator covering area 111 in the first reference plane. In other words, in the length direction of the cell body 11, the bending point of the electrode adapter 2 partially coincides with the separator covering area 111, which facilitates encapsulation and ensures that the side of the battery aluminum-plastic film shell will not be squeezed after encapsulation.

[0058] Continue to refer to Figure 5 According to some embodiments of the present invention, the first bending portion 22 is spaced apart from the cell body 11 to avoid damage to the cell body 11 caused by direct contact between the electrode adapter 2 and the cell body 11.

[0059] The following describes the processing of the sub-tab 12 and electrode adapter 2 of the battery cell assembly of this utility model:

[0060] Example 1

[0061] The processing of the sub-tab 12 and electrode adapter 2 of the battery cell assembly of this utility model may include:

[0062] S1: Press the multi-layered sub-tabs 12 of the battery cell body 11 to be welded to form a collection section 121 on the sub-tabs 12;

[0063] S2: The first body part 21 of the electrode adapter 2 is attached to one side of the collection section 121, and the end of the first body part 21 near the cell body 11 is disposed in the collection section 121.

[0064] S3: Weld the sub-electrode tab 12 to the electrode adapter 2;

[0065] S4: The electrode adapter 2 is bent for the first time to form the first bent part 22;

[0066] S5: A second bend is made in the collecting section 121 of the sub-electrode 12 to form a second bend 122. The second bend point is spaced apart from the end of the first body part 21 near the cell side. A portion of the length of the collecting section 121 constitutes the second bend 122. At this time, the distance between the projection of the first bend point and the second bend point in the first reference plane does not exceed the thickness of the cell.

[0067] Example 2

[0068] The processing of the sub-tab 12 and electrode adapter 2 of the battery cell assembly of this utility model may further include:

[0069] S1: Press the multilayer sub-tabs of the battery cell to be welded together to form a collection section 121 on the sub-tab 12;

[0070] S2: The first body part 21 of the electrode adapter 2 is attached to one side of the collection section 121, and the end of the first body part 21 near the cell body 11 is disposed in the collection section 121.

[0071] S3: Weld the sub-electrode tab 12 to the electrode adapter 2;

[0072] S4: The electrode adapter 2 is bent for the first time to form the first bent part 22;

[0073] S5: The collecting section 121 of the sub-electrode 12 is bent a second time at one end near the diaphragm covering area 111 to form a second bent portion 122. The collecting section 121 forms a second bent portion 122. The second bending point is spaced apart from the end of the first body part 21 near the cell body 11. At this time, the distance between the projection of the first bending point and the second bending point in the first reference plane does not exceed the thickness of the cell.

[0074] A second aspect of this invention also provides a battery, which may include a housing assembly and the aforementioned cell assembly. Because of the cell assembly of this invention, when the cell assembly is encapsulated within the housing assembly, the electrode adapter 2 does not extend beyond the sidewall of the cell body 11, resulting in a good assembly effect.

[0075] A third aspect of this utility model also provides an electrical device, which may include a device body and the aforementioned battery. The device body may include a battery compartment, in which the battery is disposed and electrically connected to the device body. For example, the battery compartment may be provided with a power supply interface, and the battery may be connected to the power supply interface. Because the battery of this utility model is used, the space at the battery head is fully utilized, improving the internal space utilization rate of the battery, increasing energy density, and extending the battery's runtime, resulting in a longer service life for the electrical device.

[0076] Understandably, the electrical device of this application may be a mobile electronic device, power tool, smart home device, electric vehicle and electric bicycle, drone, medical device, photography equipment, outdoor equipment, wireless headphones and Bluetooth speaker, and energy storage system, etc., which uses the aforementioned battery as a power source to power the electrical device.

[0077] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0078] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell assembly, characterized in that, include: The battery cell and electrode adapter (2) includes a first body part (21) and a first bent part (22) formed by bending. The battery cell includes a battery cell body (11), the battery cell body (11) includes a first electrode, a second electrode and a separator located between the first electrode and the second electrode, and a sub-electrode tab (12) is formed on one side edge of the first electrode and the second electrode. The diaphragm includes a diaphragm covering area (111) extending beyond the edge of the first electrode plate. The sub-electrode (12) extends to the outside of the diaphragm covering area (111). The sub-electrode (12) includes a connecting portion connected to the cell body and a second bent portion (122) formed by bending and electrically connected to the first bent portion (22). In the length direction of the cell body (11), the junction of the connecting portion and the second bent portion (122) is located on the side of the diaphragm covering area (111) away from the cell body (11).

2. The battery cell assembly according to claim 1, characterized in that, The electrode adapter (2) has a first bending point, and the sub-electrode (12) has a second bending point. The distance between the projections of the first bending point and the second bending point in the first reference plane does not exceed the thickness of the cell body (11), and the first reference plane is parallel to the thickness direction of the cell body (11).

3. A cell assembly according to claim 2, characterized in that, The projection of the first bending point in the second reference plane is located between the cell body (11) and the projection of the second bending point in the second reference plane, and the second reference plane is parallel to one side surface of the cell body (11) along the thickness direction.

4. A cell assembly according to claim 1, characterized in that, The second bent portion (122) is welded to the first bent portion (22), and the angle between the welding surfaces of the second bent portion (122) and the first bent portion (22) and the second reference surface does not exceed 90°.

5. A cell assembly according to claim 2, characterized in that, The first bending point coincides with the projection of the diaphragm covering area (111) in the first reference plane.

6. A cell assembly according to claim 1, characterized in that, The first bent portion (22) is spaced apart from the battery cell body (11).

7. A cell assembly according to claim 2, characterized in that, The battery cell body (11) includes a plurality of sub-tabs (12). All the sub-tabs (12) are stacked and converged along the thickness direction of the battery cell to form a converged section (121). At least a portion of the converged section is bent to form a second bent portion.

8. A cell assembly according to claim 7, characterized in that, The end of the collecting segment (121) near the diaphragm covering area (111) has a first distance D1 with the diaphragm covering area (111) in a first direction, where 0.1mm≤D1≤2.8mm.

9. A cell assembly according to claim 7, characterized in that, In the direction away from the diaphragm covering area (111) in the first direction, the end of the collecting section (121) near the diaphragm covering area (111) has a second distance D2 with the electrode adapter (2), 0.1mm≤D2≤2.8mm.

10. A cell assembly according to claim 7, characterized in that, The second bending point is spaced apart from one end of the converging section (121) near the membrane coverage area (111).

11. A cell assembly according to claim 7, characterized in that, The third distance between the second bending point and the end of the converging segment (121) near the diaphragm covering area (111) is less than the fourth distance between the second bending point and the first bending point in the length direction of the cell body.

12. A cell assembly according to claim 7, characterized in that, The second bending point coincides with one end of the converging segment (121) near the membrane coverage area (111).

13. A battery, characterized in that, It includes a housing assembly and a cell assembly as described in any one of claims 1-12.

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