Battery

Abstract

The utility model relates to the technical field of battery energy, in particular to a battery. According to the battery, a battery cell comprises a pole piece, the pole piece comprises a current collector, the current collector comprises a supporting layer and two metal layers on the two sides, and a lug is formed by part of the current collector; the metal protection piece comprises a first connecting part, a second connecting part and a third connecting part; the first connecting part and the second connecting part are located on the two opposite sides of the tab respectively, a protrusion is arranged on the side, facing the second connecting part, of the first connecting part, the protrusion penetrates through the tab and is electrically connected with the two metal layers of the tab respectively, and the protrusion is electrically connected with the second connecting part; the switching piece is electrically connected with the metal protection piece, and the projection of the switching piece in the thickness direction of the first connecting part and the projection of the tab in the thickness direction of the first connecting part have an overlapping area. The two metal layers on the two sides of the tab can be conducted through the metal protection piece, the connection between the metal protection piece and the tab is relatively simple, and meanwhile, the metal protection piece does not occupy the head space of the battery.

Description

Technical Field

[0001] This application relates to the field of battery energy technology, and in particular to a battery. Background Technology

[0002] In order to improve the nail penetration and impact resistance of battery cells, technicians in the lithium battery industry have begun to try to change the current collector from metal foil (such as copper foil, aluminum foil) to composite current collector, which includes a support layer (insulating layer) and metal layers located on the upper and lower sides of the support layer.

[0003] In related technologies, in order to ensure the conductivity between the upper and lower metal layers of the composite current collector, metal foil is usually transferred between the upper and lower metal layers by ultrasonic roll welding. The metal foil is then die-cut to form the electrode of the battery cell. Finally, the electrodes formed by multiple metal foils are welded to the adapter or the battery casing to achieve electrical connection between the battery cell and the outside world.

[0004] However, the connection between the metal foil and the composite current collector is relatively complex, and the metal foil occupies space at the top of the battery, reducing the energy density of the battery. Utility Model Content

[0005] Based on this, this application provides a battery to address the shortcomings of related technologies.

[0006] The battery provided in this application includes:

[0007] A battery cell includes an electrode sheet, the electrode sheet including a current collector and an active material layer disposed on the current collector, the current collector including a support layer and two metal layers respectively located on both sides of the support layer, and a portion of the current collector extends beyond the active material layer to form a tab.

[0008] The metal protective component includes a first connecting part, a second connecting part, and a third connecting part. The two ends of the third connecting part are respectively connected to the first connecting part and the second connecting part. The first connecting part and the second connecting part are located on opposite sides of the electrode tab. A protrusion is provided on the side of the first connecting part facing the second connecting part. The protrusion penetrates the electrode tab and is electrically connected to the two metal layers of the electrode tab. The end of the protrusion away from the first connecting part is electrically connected to the second connecting part.

[0009] The adapter plate is electrically connected to the metal protective component, and there is an overlapping area between the projection of the adapter plate in the thickness direction of the first connection part and the projection of the electrode in the thickness direction of the first connection part.

[0010] In one possible implementation, the end of the tab furthest from the active material layer abuts against and is electrically connected to the third connector.

[0011] In one possible implementation, the second connecting part is welded to the protrusion, and a first solder mark is formed on the side of the second connecting part opposite to the protrusion;

[0012] The adapter piece is located on the side of the first connecting part away from the second connecting part. The first connecting part is welded to the adapter piece, and a second solder mark is formed on the side of the adapter piece away from the first connecting part.

[0013] In one possible implementation, the second connecting part is welded to the protrusion, and a first solder mark is formed on the side of the second connecting part opposite to the protrusion;

[0014] The adapter piece is located on the side of the second connecting part away from the first connecting part. The second connecting part is welded to the adapter piece, and a second solder mark is formed on the side of the adapter piece away from the second connecting part.

[0015] The projection of the first solder mark in the thickness direction of the second connection part does not overlap with the projection of the second solder mark in the thickness direction of the second connection part.

[0016] In one possible implementation, the electrode includes a first connecting segment and a second connecting segment;

[0017] One end of the first connecting segment is adjacent to the active substance layer, and the other end of the first connecting segment is connected to one end of the second connecting segment;

[0018] The second connecting segment extends along the thickness direction of the battery cell and is located between the first connecting portion and the second connecting portion.

[0019] In one possible implementation, a first solder mark is formed on the side of the second connecting portion away from the protrusion, the adapter piece is welded to the first connecting portion, and a second solder mark is formed on the side of the adapter piece away from the first connecting portion.

[0020] The second connecting part is located on the side of the second connecting segment facing the active substance layer.

[0021] In one possible implementation, the battery cell has a first projection in the thickness direction of the first connection portion, and the metal protective member has a second projection in the thickness direction of the first connection portion.

[0022] In the thickness direction of the battery cell, the first projection covers the second projection.

[0023] In one possible implementation, the metal protective component and the adapter plate are integrated into one piece.

[0024] In one possible implementation, the distance between two adjacent protrusions is 0.1mm-2mm.

[0025] In one possible implementation, the thickness of the first connecting part is greater than or equal to the thickness of the second connecting part.

[0026] The battery provided in this application has a cell comprising an electrode sheet, the electrode sheet comprising a current collector and an active material layer disposed on the current collector. The current collector comprises a support layer and two metal layers respectively located on both sides of the support layer, i.e., the current collector of the electrode sheet is a composite current collector. A portion of the current collector extends beyond the active material layer to form a tab; it is understood that the tab also comprises a support layer and two metal layers respectively located on both sides of the support layer. The metal protective component of the battery comprises a first connecting portion, a second connecting portion, and a third connecting portion, and the two ends of the third connecting portion are respectively connected to the first connecting portion and the second connecting portion. The first connecting portion and the second connecting portion are respectively disposed on opposite sides of the tab of the cell, and a protrusion provided on the first connecting portion penetrates the tab and is electrically connected to the two metal layers of the tab respectively, and the end of the protrusion away from the first connecting portion is electrically connected to the second connecting portion. An adapter piece is electrically connected to the metal protective component, and the projection of the adapter piece in the thickness direction of the first connecting portion and the projection of the tab in the thickness direction of the first connecting portion have an overlapping area. In this way, the two metal layers on both sides of the tab can be connected through the metal protective component, and the connection between the metal protective component and the tab is relatively simple. At the same time, the metal protective component does not occupy the space at the top of the battery, which is conducive to improving the energy density of the battery. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram illustrating the connection between the electrode sheet, metal foil, and adapter sheet in related technologies;

[0029] Figure 2 This is a schematic diagram of the current collector structure provided in an embodiment of this application;

[0030] Figure 3 This is a schematic diagram of the structure of the electrode provided in the embodiments of this application;

[0031] Figure 4 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application;

[0032] Figure 5 This is a schematic diagram of another battery cell structure provided in an embodiment of this application;

[0033] Figure 6 This is a schematic diagram of the structure of the metal protective component provided in the embodiments of this application;

[0034] Figure 7 This is a partial structural diagram of a battery provided in an embodiment of this application;

[0035] Figure 8 This is a partial structural schematic diagram of another battery provided in an embodiment of this application;

[0036] Figure 9 This is a schematic diagram showing the connection between the metal protective component and the adapter plate provided in an embodiment of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100-Battery cell; 110-Battery cell body; 120-Taper; 121-First connecting section; 122-Second connecting section; 123-Positive tab; 124-Negative tab; 130-Electrode; 131-Current collector; 1311-Support layer; 1312-Metal layer; 132-Active material layer; 133-Insulating coating;

[0039] 200 - Metal protective component; 210 - First connecting part; 211 - Protrusion; 220 - Second connecting part; 230 - Third connecting part;

[0040] 300-Adapter;

[0041] 400 - Metal foil. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0045] The terms “first,” “second,” and “third” (if any) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0046] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or display that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or display.

[0047] In existing technologies, such as Figure 1 As shown, to ensure conductivity between the upper and lower metal layers of the current collector 131, metal foil 400 is typically transferred between the upper and lower metal layers via ultrasonic roll welding. The metal foil 400 is then die-cut to form the tabs of the battery cell 100. Finally, the tabs formed by multiple metal foils 400 are welded to the adapter piece 300 or the battery casing to achieve electrical connection between the battery cell 100 and the outside world. However, ultrasonic roll welding has a high process cost, the structure of the metal foil 400 is relatively complex, and the metal foil 400 occupies space at the battery head, reducing the battery's energy density.

[0048] After repeated consideration and verification, the inventors discovered that if the composite current collector of the electrode forms a tab, a metal protective component is used to connect it. This metal protective component includes a first connecting portion, a second connecting portion, and a third connecting portion connecting the first and second connecting portions, respectively located on opposite sides of the tab. The first connecting portion has a protrusion that penetrates the tab and is electrically connected to the two metal layers of the tab. The end of the protrusion away from the first connecting portion is electrically connected to the second connecting portion. An adapter piece is electrically connected to the metal protective component, and the projection of the adapter piece in the thickness direction of the first connecting portion overlaps with the projection of the tab in the thickness direction of the first connecting portion. In this way, the two metal layers on both sides of the tab can be connected through the metal protective component, and the connection between the metal protective component and the tab is relatively simple. Furthermore, the metal protective component does not occupy space at the top of the battery, which is beneficial for improving the energy density of the battery.

[0049] In view of this, the inventors designed a battery in which a metal protective component is electrically connected to the tabs. The first and second connecting portions of the metal protective component are located on opposite sides of the tabs. The first connecting portion has a protrusion penetrating the tab and electrically connecting to both metal layers of the tab. The protrusion is also electrically connected to the second connecting portion. An adapter plate is electrically connected to the metal protective component, and there is an overlapping area between the adapter plate and the tab. The metal protective component conducts electricity between the two metal layers of the tab without occupying space at the battery head, thus improving the battery's energy density.

[0050] The technical solution of the battery provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0051] Reference Figures 2 to 7 As shown in the embodiment of this application, the battery includes a cell 100, a metal protective component 200, and an adapter piece 300.

[0052] The battery cell 100 includes an electrode 130, which includes a current collector 131 and an active material layer 132 disposed on the current collector 131. The current collector 131 includes a support layer 1311 and two metal layers 1312 located on both sides of the support layer 1311. A portion of the current collector 131 extends beyond the active material layer 132 to form a tab 120.

[0053] In this design, electrode 130 can be either a positive or negative electrode. When electrode 130 is a positive electrode, the portion of its current collector 131 extending beyond the active material layer 132 forms a positive tab 123; when electrode 130 is a negative electrode, the portion of its current collector 131 extending beyond the active material layer 132 forms a negative tab 124. Specifically, the battery cell 100 can be formed by winding or stacking positive electrode, separator, and negative electrode. After the positive electrode, separator, and negative electrode form the battery cell 100, the regions of multiple electrode 130s with the active material layer 132 together form the battery cell body 110. The positive tabs 123 and negative tabs 124 are located at the ends of the battery cell body 110, respectively. Multiple positive tabs 123 and multiple negative tabs 124 can be stacked.

[0054] Understandably, the current collector 131 of the electrode 130 is a composite current collector. The structure of the current collector 131 is beneficial for improving the pin-piercing performance and impact resistance of the cell 100. Schematic, a portion of the current collector 131 extends beyond the active material layer 132 to form a tab 120. After the electrode 130 forms the cell 100, the tab 120 is located at the end of the cell body 110. For example... Figure 3As shown, when the electrode 130 is a positive electrode, the electrode 130 may also include an insulating coating 133 disposed on the current collector 131. The insulating coating 133 is located at the end of the active material layer 132, and a portion of the current collector 131 extends beyond the insulating coating 133 to form a tab 120.

[0055] The metal protective component 200 includes a first connecting portion 210, a second connecting portion 220, and a third connecting portion 230. Both ends of the third connecting portion 230 are connected to the first connecting portion 210 and the second connecting portion 220, respectively. The first connecting portion 210 and the second connecting portion 220 are located on opposite sides of the tab 120. A protrusion 211 is provided on the side of the first connecting portion 210 facing the second connecting portion 220. The protrusion 211 penetrates the tab 120 and is electrically connected to the two metal layers 1312 of the tab 120. The end of the protrusion 211 away from the first connecting portion 210 is electrically connected to the second connecting portion 220.

[0056] Schematic, the first, second, and third connecting portions of the metal protective component form an approximate "U"-shaped structure, with the battery cell's tabs extending into this "U"-shaped structure. In one possible implementation, the metal sheet can be bent to form the first connecting portion 210, the second connecting portion 220, and the third connecting portion 230. When the battery cell 100 includes multiple stacked tabs 120, the first connecting portion 210 can be located on one side of the multiple tabs 120, and the second connecting portion 220 can be located on the other side of the multiple tabs 120. After penetrating the tab 120, the protrusion 211 of the first connecting portion 210 is electrically connected to two metal layers 1312 of each tab 120 to achieve conductivity between the multiple tabs 120.

[0057] The protrusion 211 can be a frustum, cylinder, pyramid, or square structure, etc., and is not limited to any particular shape. The protrusion 211 can be integrally formed on the first connecting part 210. After the protrusion 211 passes through the tab 120, it can be connected to the second connecting part 220 by welding to achieve electrical connection between the protrusion 211 and the second connecting part 220.

[0058] Indicative, such as Figures 6-9 As shown, there are multiple protrusions 211, each of which passes through the tab 120 and is electrically connected to the second connecting portion 220. The multiple protrusions 211 can be arranged in multiple rows and columns on the first connecting portion 210. Those skilled in the art can set the number of protrusions 211 and the arrangement of the multiple protrusions 211 on the first connecting portion 210 as needed, and no unique limitation is made here.

[0059] Setting the number of protrusions 211 to multiple is one of the ways to improve the reliability of the connection between the tab 120 and the metal protection component 200, and to increase the conduction area between the metal layers 1312 on both sides of the tab 120 and between different tabs 120, so as to prevent the cell 100 from overheating at the tab 120 position during battery charging and discharging.

[0060] During battery assembly, the tab 120 of the cell 100 can be inserted between the first connecting part 210 and the second connecting part 220 of the metal protective component 200. The operator can press the first connecting part 210 so that the protrusion 211 on the first connecting part 210 passes through the tab 120 and abuts against the second connecting part 220. After passing through the tab 120, the protrusion 211 can make conductive contact with the two metal layers 1312 of the tab 120 respectively. By electrically connecting the protrusion 211 and the second connecting part 220, the connection between the cell 100 and the metal protective component 200 can be realized.

[0061] The adapter plate 300 is electrically connected to the metal protective member 200. The projection of the adapter plate 300 in the thickness direction of the first connecting part 210 and the projection of the tab 120 in the thickness direction of the first connecting part 210 have an overlapping area.

[0062] Schematic, the adapter 300 can be made of metal. The adapter 300 can be electrically connected to the first connecting portion 210, or it can be electrically connected to the second connecting portion 220. It should be noted that the projection of the adapter 300 in the thickness direction of the first connecting portion 210 overlaps with the projection of the tab 120 in the thickness direction of the first connecting portion 210. This helps to reduce the space occupied by the tab 120, the metal protective member 200, and the adapter 300. Compared to using metal foil to connect the tab 120 and the adapter 300, this reduces the space occupied by the battery head and increases the battery's energy density.

[0063] The battery in this embodiment has a cell 100 including an electrode 130. The electrode 130 includes a current collector 131 and an active material layer 132 disposed on the current collector 131. The current collector 131 includes a support layer 1311 and two metal layers 1312 located on both sides of the support layer 1311, that is, the current collector 131 of the electrode 130 is a composite current collector. A portion of the current collector 131 extends beyond the active material layer 132 to form a tab 120. It is understood that the tab 120 also includes a support layer 1311 and two metal layers 1312 located on both sides of the support layer 1311. The metal protective component 200 of the battery includes a first connecting portion 210, a second connecting portion 220, and a third connecting portion 230, and the two ends of the third connecting portion 230 are respectively connected to the first connecting portion 210 and the second connecting portion 220. The first connecting portion 210 and the second connecting portion 220 are respectively disposed on opposite sides of the tab 120 of the battery cell 100. A protrusion 211 on the first connecting portion 210 penetrates the tab 120 and is electrically connected to the two metal layers 1312 of the tab 120. The end of the protrusion 211 away from the first connecting portion 210 is electrically connected to the second connecting portion 220. An adapter piece 300 is electrically connected to the metal protective member 200, and the projection of the adapter piece 300 in the thickness direction of the first connecting portion 210 overlaps with the projection of the tab 120 in the thickness direction of the first connecting portion 210. In this way, the two metal layers 1312 on both sides of the tab 120 can be connected through the metal protective member 200, and the connection between the metal protective member 200 and the tab 120 is relatively simple. Furthermore, the metal protective member 200 does not occupy the battery head space, which is beneficial for improving the energy density of the battery.

[0064] In addition, the protrusion 211 on the first connecting part 210 can also fix the tab 120. The connection between the metal protective part 200 and the tab 120 is highly reliable, so the tab 120 can be reliably electrically connected to the adapter piece 300.

[0065] It is worth mentioning that the battery also includes an aluminum-plastic film disposed on the outside of the cell 100 and the metal protective component 200, with the portion of the adapter 300 away from the metal protective component 200 extending out from the aluminum-plastic film. The third connecting portion 230 of the metal protective component 200 can also provide some protection for the aluminum-plastic film, reducing the probability of damage to the film when the metal protective component 200 collides with it. Furthermore, the third connecting portion 230 of the metal protective component 200 is connected to the first connecting portion 210 and the second connecting portion 220 respectively. When connecting the metal protective component 200 to the tab 120 of the cell 100, it is easy for the operator to determine the relative position between the first connecting portion 210 and the second connecting portion 220, ensuring that the protrusion 211 on the first connecting portion 210 can quickly make an electrical connection with the second connecting portion 220 after passing through the tab 120.

[0066] In other embodiments, the metal protective component 200 may consist only of a first connecting portion 210 and a second connecting portion 220, with a protrusion 211 on the first connecting portion 210 penetrating the electrode tab 120 and electrically connecting to the second connecting portion 220. Operators can select and use the first connecting portion 210 and the second connecting portion 220 with suitable shapes and sizes according to the specifications of the battery cell 100, thus improving the versatility of the metal protective component 200.

[0067] In one embodiment, such as Figure 7 and Figure 8 As shown, the end of the tab 120 away from the active material layer 132 abuts against the third connection portion 230 and is electrically connected to the third connection portion 230.

[0068] When the end of the tab 120 abuts against the third connecting part 230, the two metal layers 1312 of the tab 120 are electrically connected to the third connecting part 230 respectively. In this way, the third connecting part 230 can also conduct electricity between the metal layers 1312 on both sides of the tab 120 and between different tabs 120.

[0069] By increasing the metal layers 1312 on both sides of the tab 120 and the conduction area between different tabs 120, the internal resistance of the battery can be reduced.

[0070] In one possible implementation, the second connecting portion 220 is welded to the protrusion 211, and a first solder mark is formed on the side of the second connecting portion 220 opposite to the protrusion 211.

[0071] The adapter piece 300 is located on the side of the first connecting portion 210 away from the second connecting portion 220. The first connecting portion 210 is welded to the adapter piece 300, and a second solder mark is formed on the side of the adapter piece 300 away from the first connecting portion 210.

[0072] For example, the second connecting portion 220 and the protrusion 211 can be fixed by pressure welding, and a first weld mark protruding from the main body of the second connecting portion 220 is formed on the side of the second connecting portion 220 away from the protrusion 211.

[0073] The adapter piece 300 and the first connecting part 210 can be fixed by pressure welding or laser welding. After the adapter piece 300 and the first connecting part 210 are welded, a second weld mark protruding from the main body of the adapter piece 300 is formed on the side of the adapter piece 300 away from the first connecting part 210.

[0074] It is worth mentioning that the second connecting part 220 and the protrusion 211, as well as the adapter piece 300 and the first connecting part 210, are fixed by two welding processes. Compared with the method of connecting the adapter piece 300 and the second connecting part 220, the protrusion 211, the second connecting part 220 and the adapter piece 300 are fixed by one welding process, which helps to reduce the welding difficulty and the height of the weld mark protrusion 211 formed by welding.

[0075] With the above arrangement, the first solder mark and the second solder mark are located on both sides of the metal protective part 200, so as to avoid the first solder mark and the second solder mark overlapping and affecting the reliability of the welding between the second connecting part 220 and the protrusion 211 and between the adapter piece 300 and the first connecting part 210.

[0076] In another possible implementation, the second connecting portion 220 is welded to the protrusion 211, and a first solder mark is formed on the side of the second connecting portion 220 opposite to the protrusion 211.

[0077] The adapter piece 300 is located on the side of the second connecting portion 220 opposite to the first connecting portion 210. The second connecting portion 220 is welded to the adapter piece 300, and a second solder mark is formed on the side of the adapter piece 300 opposite to the second connecting portion 220.

[0078] The projection of the first solder mark in the thickness direction of the second connection portion 220 does not overlap with the projection of the second solder mark in the thickness direction of the second connection portion 220.

[0079] Indicatively, the second connecting portion 220 can be welded to the protrusion 211 first, and then the second connecting portion 220 can be welded to the adapter piece 300. Understandably, different areas of the second connecting portion 220 are welded to the protrusion 211 and the adapter piece 300 respectively. The first and second weld marks do not overlap, ensuring the reliability of the welding between the second connecting portion 220 and the protrusion 211, and between the adapter piece 300 and the second connecting portion 220.

[0080] like Figure 8 As shown, the tab 120 includes a first connecting segment 121 and a second connecting segment 122. One end of the first connecting segment 121 is adjacent to the active material layer 132, and the other end of the first connecting segment 121 is connected to one end of the second connecting segment 122. The second connecting segment 122 extends along the thickness direction of the cell 100 and is located between the first connecting portion 210 and the second connecting portion 220.

[0081] The first connecting section is close to the cell body, and the second connecting section is away from the cell body. The tab 120 can be bent so that the end of the tab 120 away from the cell body 110 is along the thickness direction of the cell 100. Figure 7 and Figure 8Extending in the direction indicated by the Y-axis. The first connecting segment 121 and the second connecting segment 122 of the electrode tab 120 are located on both sides of the bent portion of the electrode tab 120, respectively. The end of the second connecting segment 122 away from the first connecting segment 121 extends into the interior of the "U"-shaped structure of the metal protective member 200.

[0082] In one possible implementation, such as Figure 8 As shown, the adapter piece 300 can be bent into an "L" shape. One side of the "L" shape is electrically connected to the metal protective piece 200, and the other side of the "L" shape can be used for electrical connection to an external circuit.

[0083] This structure, by bending the tab 120, can reduce the distance between the tab 120, the metal protective piece 200, and the adapter piece 300 along the length of the battery. Figure 7 and Figure 8 The space occupied in the direction indicated by the X-axis further improves the energy density of the battery.

[0084] In one specific implementation, such as Figure 8 As shown, a first solder mark is formed on the side of the second connecting portion 220 opposite to the protrusion 211. The adapter piece 300 is welded to the first connecting portion 210, and a second solder mark is formed on the side of the adapter piece 300 opposite to the first connecting portion 210. The second connecting portion 220 is located on the side of the second connecting section 122 facing the cell body 110.

[0085] It is worth mentioning that during the welding process between the protrusion 211 and the second connecting portion 220, the heat generated during welding can achieve fusion between the metal layer 1312 of the tab 120 and the protrusion 211, thereby achieving a reliable electrical connection between the metal layer 1312 and the protrusion 211. Thus, the welding power between the protrusion 211 and the second connecting portion 220 is greater than the welding power between the adapter piece 300 and the first connecting portion 210, resulting in a greater protrusion height of the first weld mark than the second weld mark. The first weld mark with a larger protrusion height is located on the side of the metal protective member 200 facing the cell body 110, while the second weld mark with a smaller protrusion height is located on the side of the metal protective member 200 away from the cell body 110.

[0086] Those skilled in the art will understand that an aluminum-plastic film is provided on the outer side of the battery cell 100, and the end of the adapter piece 300 away from the battery cell body 110 extends out of the aluminum-plastic film. Placing the first solder mark with a relatively large protrusion on the side of the metal protective piece 200 facing the battery cell body 110 can prevent the first solder mark with a relatively large protrusion from facing the aluminum-plastic film and coming into contact with the aluminum-plastic film, which could cause a short circuit in the battery. In other words, the above arrangement helps to improve the safety of the battery.

[0087] like Figure 8As shown, the battery cell 100 has a first projection in the thickness direction of the first connecting portion 210, and the metal protective member 200 has a second projection in the thickness direction of the first connecting portion 210. In the thickness direction of the battery cell 100, the first projection covers the second projection.

[0088] Specifically, in the thickness direction of cell 100, i.e. Figure 8 In the direction indicated by the Y-axis, the end of the metal protective component 200 does not extend beyond the cell body 110. Furthermore, in the thickness direction of the cell 100, the adapter piece 300 also does not extend beyond the cell body 110. The above arrangement can prevent the metal protective component 200 from increasing the battery thickness, thus ensuring the energy density of the battery.

[0089] In one possible implementation, such as Figure 9 As shown, the metal protective component 200 and the adapter piece 300 form an integral part.

[0090] By forming the metal protective component 200 and the adapter piece 300 into a single piece through integral molding, the reliability of the connection between the metal protective component 200 and the adapter piece 300 can be guaranteed. During battery assembly, the connection process between the metal protective component 200 and the adapter piece 300 can be reduced, which is beneficial to improving battery production efficiency.

[0091] In one possible implementation, the distance between two adjacent protrusions 211 is 0.1mm-2mm.

[0092] For example, the distance between two adjacent protrusions 211 can be 0.1mm, 1mm, or 2mm, etc., and is not limited to one. When the distance between two adjacent protrusions 211 is less than 0.1mm, on the one hand, the distribution of multiple protrusions 211 is too dense, and a single protrusion 211 is not easy to penetrate the tab 120. On the other hand, the penetration of the tab 120 is too severe, which reduces the welding pull. When the distance between two adjacent protrusions 211 is greater than 2mm, the conductive area between the metal layers 1312 on both sides of the tab 120 and between different tabs 120 is small. During battery charging and discharging, the cell 100 is prone to overheating at the tab 120 position.

[0093] This structure ensures the conductive area between the metal layers 1312 on both sides of the tab 120 and between different tabs 120, while also allowing a single protrusion 211 to easily penetrate the tab 120 and ensuring the welding pull force of the tab 120.

[0094] In one possible implementation, the thickness of the first connecting portion 210 is greater than or equal to the thickness of the second connecting portion 220.

[0095] During battery assembly, the worker can press the first connecting part 210 so that the protrusion 211 on the first connecting part 210 passes through the tab 120.

[0096] The thickness of the first connecting part 210 is not less than the thickness of the second connecting part 220 to ensure that the protrusion 211 has sufficient penetration strength. When the protrusion 211 penetrates the tab 120, the first connecting part 210 is not easily deformed, ensuring that the protrusion 211 can penetrate the tab 120.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery, characterized in that, include: A battery cell (100) includes an electrode (130), the electrode (130) including a current collector (131) and an active material layer (132) disposed on the current collector (131), the current collector (131) including a support layer (1311) and two metal layers (1312) respectively located on both sides of the support layer (1311), and a portion of the current collector (131) extends beyond the active material layer (132) to form a tab (120); The metal protective component (200) includes a first connecting portion (210), a second connecting portion (220), and a third connecting portion (230). The two ends of the third connecting portion (230) are respectively connected to the first connecting portion (210) and the second connecting portion (220). The first connecting portion (210) and the second connecting portion (220) are respectively located on opposite sides of the electrode tab (120). A protrusion (211) is provided on the side of the first connecting portion (210) facing the second connecting portion (220). The protrusion (211) penetrates the electrode tab (120) and is electrically connected to the two metal layers (1312) of the electrode tab (120). The end of the protrusion (211) away from the first connecting portion (210) is electrically connected to the second connecting portion (220). The adapter plate (300) is electrically connected to the metal protective member (200), and the projection of the adapter plate (300) in the thickness direction of the first connecting part (210) and the projection of the tab (120) in the thickness direction of the first connecting part (210) have an overlapping area.

2. The battery according to claim 1, characterized in that, The end of the tab (120) away from the active material layer (132) abuts against the third connection part (230) and is electrically connected to the third connection part (230).

3. The battery according to claim 1, characterized in that, The second connecting part (220) is welded to the protrusion (211), and a first solder mark is formed on the side of the second connecting part (220) opposite to the protrusion (211); The adapter piece (300) is located on the side of the first connecting part (210) away from the second connecting part (220). The first connecting part (210) is welded to the adapter piece (300). A second solder mark is formed on the side of the adapter piece (300) away from the first connecting part (210).

4. The battery according to claim 1, characterized in that, The second connecting part (220) is welded to the protrusion (211), and a first solder mark is formed on the side of the second connecting part (220) opposite to the protrusion (211); The adapter piece (300) is located on the side of the second connecting part (220) away from the first connecting part (210). The second connecting part (220) is welded to the adapter piece (300). A second solder mark is formed on the side of the adapter piece (300) away from the second connecting part (220). The projection of the first solder mark on the thickness direction of the second connection portion (220) does not overlap with the projection of the second solder mark on the thickness direction of the second connection portion (220).

5. The battery according to claim 1, characterized in that, The electrode (120) includes a first connecting section (121) and a second connecting section (122); One end of the first connecting segment (121) is adjacent to the active material layer (132), and the other end of the first connecting segment (121) is connected to one end of the second connecting segment (122); The second connecting segment (122) extends along the thickness direction of the cell (100) and is located between the first connecting portion (210) and the second connecting portion (220).

6. The battery according to claim 5, characterized in that, The second connecting part (220) has a first solder mark on the side opposite to the protrusion (211), the adapter piece (300) is welded to the first connecting part (210), and the adapter piece (300) has a second solder mark on the side opposite to the first connecting part (210). The second connecting portion (220) is located on the side of the second connecting segment (122) facing the active material layer (132).

7. The battery according to claim 5, characterized in that, The battery cell (100) has a first projection in the thickness direction of the first connecting portion (210), and the metal protective member (200) has a second projection in the thickness direction of the first connecting portion (210). In the thickness direction of the cell (100), the first projection covers the second projection.

8. The battery according to claim 1, characterized in that, The metal protective component (200) and the adapter piece (300) form an integral part.

9. The battery according to claim 8, characterized in that, The distance between two adjacent protrusions (211) is 0.1mm-2mm.

10. The battery according to any one of claims 1-9, characterized in that, The thickness of the first connecting portion (210) is greater than or equal to the thickness of the second connecting portion (220).

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