battery

Abstract

The utility model discloses a battery, include: shell, the shell is equipped with the avoidance mouth in its thickness direction one side, bare electric core, bare electric core is located in the shell, bare electric core is equipped with first lead-out portion and second lead-out portion in the length direction one side of shell, first lead-out portion is connected in the shell far away avoidance mouth one side, first insulating part and second insulating part, first lead-out portion, first insulating part, second lead-out portion with second insulating piece are in the shell in order and stack, second insulating piece is equipped with avoidance hole, and the position of avoidance hole with avoidance mouth is corresponding, cap subassembly, cap subassembly is connected in the outside of shell and is sealed up avoidance mouth, and the lead-out terminal of cap subassembly is insulated with shell setting, and the lead-out terminal passes through avoidance mouth and avoidance hole and is connected with second lead-out portion.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and specifically relates to a battery. Background Technology

[0002] In the prior art, the positive and negative tabs inside the battery are usually spaced apart along the width of the battery. This layout limits the width of the tabs, resulting in a small contact area between the tabs and the casing and lead terminals, which affects the charging and discharging efficiency of the battery and has low space utilization. Utility Model Content

[0003] The purpose of this invention is to provide a new technical solution for batteries, which can at least solve the technical problems of low charging and discharging efficiency or low space utilization of existing batteries.

[0004] This utility model provides a battery, comprising: a casing, wherein the casing has a clearance opening on one side in its thickness direction; a bare battery cell, wherein the bare battery cell is disposed inside the casing, and the bare battery cell has a first lead-out portion and a second lead-out portion on one side in the length direction of the casing, the first lead-out portion being connected to the side of the casing away from the clearance opening; a first insulating member and a second insulating member, wherein the first lead-out portion, the first insulating member, the second lead-out portion, and the second insulating member are sequentially stacked inside the casing; the second insulating member has a clearance hole, the clearance hole being positioned corresponding to the clearance opening; and a cap assembly, wherein the cap assembly is connected to the outside of the casing and blocks the clearance opening, the lead-out terminal of the cap assembly being insulated from the casing, and the lead-out terminal passing through the clearance opening and the clearance hole and connecting to the second lead-out portion.

[0005] Optionally, the first insulating member has a gas-liquid channel extending through its thickness direction, the second lead-out portion and the second insulating member avoid at least a portion of the gas-liquid channel, and at least a portion of the gas-liquid channel corresponds to the position of the avoidance port, so that the battery can be filled with liquid through the avoidance port when the cap assembly is not installed.

[0006] Optionally, the tail end of the second lead extends to the edge of the gas-liquid channel near the bare cell side to avoid the gas-liquid channel.

[0007] Optionally, the outer shell is an arc-shaped outer shell, and the mating surface between the cap assembly and the outer shell is a plane.

[0008] Optionally, the housing has a groove on one side in its thickness direction, the bottom of the groove has the clearance opening, and at least a portion of the cap assembly is located within the groove.

[0009] Optionally, the cap assembly includes: a lead-out terminal, the lead-out terminal including a plate portion and a column portion; the plate portion is disposed at a first end of the column portion, and the second end of the column portion passes through the clearance opening and the clearance hole and connects to the second lead-out portion; a connecting plate, the connecting plate being sleeved on the column portion and located between the plate portion and the outer shell, an insulating sealing layer being provided between the connecting plate and the lead-out terminal, the insulating sealing layer connecting the connecting plate and the lead-out terminal as a whole, and the connecting plate being connected to the outer shell.

[0010] Optionally, the insulating sealing layer includes a first insulating sealing portion and a second insulating sealing portion, wherein the first insulating sealing portion is located between the plate portion and the connecting plate, and the second insulating sealing portion is clamped between the column portion and the connecting plate.

[0011] Optionally, the insulating sealing layer is bonded to the plate body, and the connecting plate is bonded to the insulating sealing layer.

[0012] Optionally, the insulating sealing layer and the plate body portion are separated from the outer peripheral area of ​​the connecting plate, and the outer peripheral area is welded to the outer shell.

[0013] Optionally, the outer casing has a groove on one side in its thickness direction, the bottom of the groove has the clearance opening, at least a portion of the plate portion is located in the groove, and there is a gap between the outer periphery of the plate portion and the inner wall of the groove, the gap being filled with insulating adhesive.

[0014] Optionally, a third insulating member is provided on the side of the connecting plate away from the plate body, and the third insulating member is located inside the clearance opening.

[0015] Optionally, the third insulating element partially overlaps with the second insulating element.

[0016] Optionally, the first lead-out portion abuts against the outer casing, and the second lead-out portion abuts against the cylindrical portion; and / or, the second lead-out portion is welded to the cylindrical portion.

[0017] Optionally, the first insulating element includes: an insulating layer, wherein the insulating layer has a first metal layer on the side near the first lead-out portion, and the first metal layer is welded to the first lead-out portion; and / or, wherein the insulating layer has a second metal layer on the side near the second lead-out portion, and the second metal layer is welded to the second lead-out portion.

[0018] Optionally, the first insulating element is a separator between the first electrode and the second electrode of the bare battery cell, and the first lead-out portion is provided with a first electrode material layer on the side near the separator, and the second lead-out portion is provided with a second electrode material layer on the side near the separator.

[0019] Optionally, the housing includes: a shell having an opening on a first side in its thickness direction, and the bare battery cell disposed inside the shell; and a cover welded to the side of the shell having the opening, with the clearance opening disposed on the cover or the shell.

[0020] Optionally, both the groove and the clearance opening are provided on the cover, the second insulating member is bonded to the cover, and the outer contour of the second insulating member corresponds to the outer contour of the wall of the groove.

[0021] Optionally, the bare cell has a wound structure, and the bare cell includes a first electrode and a second electrode; wherein, the tail of the first electrode exposes a first current collector at least on the side away from the second electrode to form the first lead-out portion, and the tail of the second electrode exposes a second current collector at least on the side away from the first electrode to form the second lead-out portion.

[0022] According to the present invention, by stacking the first lead and the second lead along the thickness direction of the outer casing, the space utilization rate can be improved. The width of the first lead and the second lead can be increased in a limited space, thereby effectively increasing the contact area between the first lead and the outer casing and the contact area between the second lead and the lead terminal, thus effectively improving the charging and discharging efficiency of the battery. Moreover, under the joint action of the first lead, the first insulating member, the second lead and the second insulating member, the reliability of the electrical connection between the first lead and the outer casing can be guaranteed.

[0023] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0025] Figure 1 This is a perspective view of a battery according to an embodiment of the present invention; Figure 2 This is a perspective view of a battery according to another embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a battery without the cap assembly according to an embodiment of the present invention; Figure 4 This is an exploded view of the structure of a battery according to an embodiment of the present invention; Figure 5 This is a partial structural schematic diagram of a battery according to an embodiment of the present invention; Figure 6 This is a partial structural schematic diagram of a battery according to another embodiment of the present invention; Figure label: 100. Battery; 10. Casing; 20. Cover; 21. Groove; 22. Clearance opening; 30. Bare cell; 31. First lead-out portion; 32. Second lead-out portion; 40. First insulating component; 41. Gas-liquid channel; 50. Second insulating component; 60. Cap assembly; 61. Lead-out terminal; 611. Plate portion; 612. Column portion; 62. Connecting plate; 621. Outer peripheral area; 63. Insulating sealing layer; 70. Insulating adhesive; 80. Third insulating component. Detailed Implementation

[0026] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0027] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0028] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0029] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0031] The battery 100 according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0032] like Figures 1 to 6 As shown, the battery 100 according to an embodiment of the present utility model includes: a casing, a bare cell 30, a first insulating member 40, and a second insulating member 50.

[0033] Specifically, the outer casing has a clearance opening 22 on one side of its thickness direction. The bare battery cell 30 is disposed inside the outer casing. The bare battery cell 30 has a first lead-out portion 31 and a second lead-out portion 32 on one side of the outer casing in the length direction. The first lead-out portion 31 is connected to the side of the outer casing away from the clearance opening 22. The first lead-out portion 31, the first insulating member 40, the second lead-out portion 32, and the second insulating member 50 are stacked sequentially inside the outer casing. The second insulating member 50 has a clearance hole, which corresponds to the position of the clearance opening 22. A cap assembly 60 is connected to the outside of the outer casing and blocks the clearance opening 22. The lead-out terminal 61 of the cap assembly 60 is insulated from the outer casing. The lead-out terminal 61 passes through the clearance opening 22 and the clearance hole and connects to the second lead-out portion 32.

[0034] In other words, such as Figures 1 to 6 As shown, the battery 100 according to this embodiment of the present invention is a curved battery or a strip-shaped battery. The battery 100 mainly includes a casing, a bare cell 30, and a cap assembly 60. The casing has a clearance opening 22 on its first side in the thickness direction. The bare cell 30 can be a stacked bare cell 30 or a wound bare cell 30, and the bare cell 30 has a flat structure. The bare cell 30 is disposed inside the casing, and its length direction is the same as the length direction of the casing, and its thickness direction is the same as the thickness direction of the casing. The bare cell 30 has a first lead-out portion 31 and a second lead-out portion 32 on one side in the length direction. The first lead-out portion 31 can be led out from the negative electrode of the bare cell 30, and the second lead-out portion 32 can be led out from the positive electrode of the bare cell 30. The lead-out portions can be tabs or lead foils. A first insulating member 40 is provided between the first lead-out portion 31 and the second lead-out portion 32. An insulating member is provided on the side of the second lead-out portion 32 away from the first insulating member 40. The first lead-out portion 31, the first insulating member 40 and the second lead-out portion 32 are stacked along the thickness direction of the outer shell.

[0035] The first lead-out portion 31 is located on the side of the first insulating member 40 facing away from the clearance opening 22, and the second lead-out portion 32 is located on the side of the first insulating member 40 near the clearance opening 22. The second insulating member 50 separates the second lead-out portion 32 from the outer casing. Under the combined action of the first lead-out portion 31, the first insulating member 40, the second lead-out portion 32, and the second insulating member 50, the side of the first lead-out portion 31 facing away from the first insulating member 40 abuts against the outer casing, and the side of the second insulating member 50 near the clearance opening 22 abuts against the outer casing. The second insulating member 50 has a clearance hole extending through its thickness direction, which corresponds to the position of the clearance opening 22, allowing the second lead-out portion 32 to protrude from the clearance opening 22. The cap assembly 60 is fixedly connected to the first side of the outer casing, and its position corresponds to the clearance opening 22. When the cap assembly 60 is installed in place, it can completely block the clearance opening 22, and the lead-out terminal 61 (i.e., pole) of the cap assembly 60 is insulated from the housing. A portion of the lead-out terminal 61 passes through the clearance opening 22 and the clearance hole and connects to the second lead-out portion 32, for example, by abutment or welding.

[0036] Therefore, according to the embodiment of the present invention, the battery 100, by stacking the first lead-out portion 31 and the second lead-out portion 32 along the thickness direction of the outer casing, can improve space utilization and increase the width of the first lead-out portion 31 and the second lead-out portion 32 within a limited space, thereby effectively increasing the contact area between the first lead-out portion 31 and the outer casing and the contact area between the second lead-out portion 32 and the lead-out terminal, thereby effectively improving the charging and discharging efficiency of the battery 100; moreover, under the joint action of the first lead-out portion 31, the first insulating member 40, the second lead-out portion 32 and the second insulating member 50, the reliability of the electrical connection between the first lead-out portion 31 and the outer casing can be guaranteed.

[0037] According to one embodiment of the present invention, the first insulating member 40 is provided with a gas-liquid channel 41 extending through its thickness direction, the second lead-out portion 32 and the second insulating member 50 avoid at least a portion of the gas-liquid channel 41, and the at least a portion of the gas-liquid channel 41 corresponds to the position of the avoidance port 22, so that the battery 100 can be filled with liquid through the avoidance port 22 when the cap assembly 60 is not installed.

[0038] Specifically, such as Figures 3 to 6As shown, the first insulating member 40 has a gas-liquid channel 41 extending along its thickness at a position corresponding to the clearance opening 22, and the second lead-out portion 32 and the second insulating member 50 avoid the gas-liquid channel 41, so that the gas-liquid channel 41 can communicate with the clearance opening 22. When assembling the battery 100, the casing, bare cell 30, first insulating member 40 and second insulating member 50 are assembled into a whole to form the battery 100 body. In the drying process, the gas generated inside the battery 100 body can be discharged sequentially through the gas-liquid channel 41 and the clearance opening 22; in the electrolyte injection process, the electrolyte is injected from the clearance opening 22 and flows into the bare cell 30 through the gas-liquid channel 41; in the formation process, the gas generated inside the battery 100 body can be discharged through the gas-liquid channel 41 and the clearance opening 22.

[0039] In this embodiment, the gas-liquid channel 41 allows the clearance port 22 to serve as an injection port, eliminating the need for additional injection holes on the outer casing. This simplifies the casing structure and eliminates the need for a sealing step, thereby significantly reducing the risk of leakage.

[0040] In some optional embodiments of this invention, the first insulating member 40 has a notch at the end away from the bare battery cell 30, and the notch defines the gas-liquid channel 41. In some specific embodiments of this utility model, the tail end of the second lead-out portion 32 extends to the edge of the gas-liquid channel 41 near the bare cell 30, so as to avoid the gas-liquid channel 41.

[0041] Specifically, such as Figure 3 As shown, the second lead-out portion 32 has a first end and a second end that are disposed opposite to each other in the length direction of the outer casing. The first end of the second lead-out portion 32 is connected to the bare cell 30, and the second end of the second lead-out portion 32 extends to the edge of the gas-liquid channel 41 near the bare cell 30. Therefore, it is not necessary to provide an additional avoidance structure on the second lead-out portion 32, which can simplify the manufacturing process of the battery 100.

[0042] In some specific embodiments of this utility model, the outer shell is an arc-shaped outer shell, and the mating surface between the cap assembly 60 and the outer shell is a plane.

[0043] In other words, the outer casing can be a straight strip or a curved arc. When the outer casing is a straight strip, the battery 100 is a strip battery 100; when the outer casing is curved, the battery 100 is a curved battery. In this embodiment, the outer casing is curved. In related technologies, the first side surface of the curved outer casing in the thickness direction is an arc surface, and the cap assembly 60 has an arc surface corresponding to this arc surface so that the two can be assembled. However, the above structure has extremely high requirements for processing precision. If the processing precision is insufficient, gaps will appear in the fit between the cap assembly 60 and the curved outer casing, thereby affecting the sealing performance of the battery 100.

[0044] Based on this, in this embodiment, the mating surface between the cap assembly 60 and the outer casing is configured as a plane, which can significantly reduce the requirements for machining accuracy, thereby improving production efficiency and reducing costs. At the same time, the planar mating structure can better ensure a tight fit between the cap assembly 60 and the outer casing, effectively avoiding gap problems caused by machining errors, and thus significantly improving the sealing performance of the battery 100.

[0045] According to one embodiment of the present invention, the outer shell is provided with a groove 21 on one side in the thickness direction, the bottom of the groove 21 is provided with the clearance opening 22, and at least a portion of the cap assembly 60 is located in the groove 21.

[0046] Specifically, a groove 21 is formed by stamping on the first side of the outer casing in the thickness direction. The groove 21 is recessed inward from the outer surface of the outer casing to form a recessed space for accommodating the cap assembly 60. The bottom surface of the stamped groove 21 is flat, and the cap assembly 60 can directly fit against this flat surface to form a planar fit with the outer casing, which can reduce the processing precision requirements and improve the sealing performance of the battery 100.

[0047] In this embodiment, part or all of the cap assembly 60 is located within the groove 21, which can effectively reduce the overall thickness of the battery 100, thereby increasing the volumetric energy density.

[0048] In some specific embodiments of this utility model, the cap assembly 60 includes: a lead-out terminal 61, which includes a plate portion 611 and a column portion 612; the plate portion 611 is disposed at the first end of the column portion 612, and the second end of the column portion 612 passes through the clearance opening 22 and the clearance hole and is connected to the second lead-out portion 32; a connecting plate 62, which is sleeved on the column portion 612 and located between the plate portion 611 and the outer shell, and an insulating sealing layer 63 is provided between the connecting plate 62 and the lead-out terminal 61, the insulating sealing layer 63 connecting the connecting plate 62 and the lead-out terminal 61 into one unit, and the connecting plate 62 being connected to the outer shell.

[0049] In other words, the cap assembly 60 mainly includes a lead-out terminal 61, a connecting plate 62, and an insulating sealing layer 63. The lead-out terminal 61 comprises an integrally formed plate portion 611 and a column portion 612. The plate portion 611 is located at the first end of the column portion 612. The connecting plate 62 is sleeved on the column portion 612 and is insulated from the lead-out terminal 61 by the insulating sealing layer 63. Simultaneously, the insulating sealing layer 63 connects the connecting plate 62 and the lead-out terminal 61 into a single unit, making the cap assembly 60 an integrated structure. During assembly, the second end of the column portion 612 passes sequentially through the clearance opening 22 and the clearance hole and connects to the second lead-out portion 32, achieving electrical connection between the lead-out terminal 61 and the second lead-out portion 32. The connecting plate 62 is fixed to the outer shell by adhesive or welding, thereby completing the connection between the cap assembly 60 and the outer shell.

[0050] In this embodiment, the cap assembly 60 is an integrated structure that can be directly installed onto the outer casing, eliminating the need for individual component positioning, significantly simplifying the assembly process and improving production efficiency. Simultaneously, the connecting plate 62 of the cap assembly 60 covers most of the insulating sealing layer 63, effectively isolating the insulating sealing layer 63 from the electrolyte, significantly reducing the contact area between the two, and minimizing the chemical corrosion of the insulating sealing layer 63 by the electrolyte. This effectively improves sealing reliability and extends the battery 100's lifespan.

[0051] In some alternative embodiments of this invention, the cap assembly 60 includes lead-out terminals 61 and an insulating sealing layer 63, which is directly bonded to the surface of the housing.

[0052] In some specific embodiments of this utility model, the width of the second lead-out portion 32 at the end near the second electrode is the same as that of the second electrode, and its width gradually decreases from the end near the second electrode to the end away from the second electrode, so as to avoid the second lead-out portion 32 from contacting the outer casing. For example, its width gradually decreases on both sides to be the same as the radial dimension of the column portion 612.

[0053] According to one embodiment of the present invention, the insulating sealing layer 63 includes a first insulating sealing portion and a second insulating sealing portion. The first insulating sealing portion is located between the plate portion 611 and the connecting plate 62, and the second insulating sealing portion is clamped between the column portion 612 and the connecting plate 62.

[0054] Specifically, the insulating sealing layer 63 is made of rubber and includes an integrally formed first insulating sealing portion and a second insulating sealing portion. The first insulating sealing portion is an annular sheet shape, sandwiched between the plate portion 611 and the connecting plate 62. The second insulating sealing portion is an annular column shape, covering the outer periphery of the column portion 612 and radially clamped by the column portion 612 and the connecting plate 62. Thus, the insulating sealing layer 63 achieves comprehensive electrical isolation between the lead-out terminal 61 and the connecting plate 62, while also utilizing the compression deformation of the second insulating sealing portion to form a dense seal, thereby effectively improving the reliability of the seal.

[0055] In some specific embodiments of this utility model, the insulating sealing layer 63 is bonded to the plate body 611, and the connecting plate 62 is bonded to the insulating sealing layer 63. That is, the plate body 611, the insulating sealing layer 63, and the connecting plate 62 are fixed together as a whole by adhesive bonding, without the need for additional complex connection structures, thereby significantly simplifying the molding process of the cap assembly 60 and reducing manufacturing costs.

[0056] According to one embodiment of the present invention, the insulating sealing layer 63 and the plate body portion 611 are separated from the outer peripheral area 621 of the connecting plate 62, and the outer peripheral area 621 is welded to the outer shell.

[0057] In other words, such as Figure 5 As shown, the radial dimensions of the first insulating sealing part and the plate part 611 are both smaller than the radial dimension of the connecting plate 62, and the three are arranged coaxially, so that the insulating sealing layer 63 and the plate part 611 are located inside the outer peripheral area 621 of the connecting plate 62. This makes the outer peripheral area 621 of the connecting plate 62 an exposed annular area, which can be directly used as the welding site for laser welding. Using the laser penetration welding process, the outer peripheral area 621 of the connecting plate 62 can be efficiently welded to the shell to form a continuous annular weld, thereby achieving high-strength fixation and sealing between the cap assembly 60 and the shell.

[0058] In some specific embodiments of this utility model, the outer shell is provided with a groove 21 on one side in the thickness direction, the bottom of the groove 21 is provided with the clearance opening 22, at least a portion of the plate body 611 is located in the groove 21, there is a gap between the outer periphery of the plate body 611 and the inner wall surface of the groove 21, and the gap is filled with insulating glue 70.

[0059] Since the gap between the outer periphery of the plate portion 611 and the inner wall of the groove 21 is usually small, impurities such as metal dust may form a conductive bridge once they intrude, causing a momentary short circuit between the plate portion 611 and the outer casing. To address this, in this embodiment, insulating adhesive 70 (e.g., UV adhesive) is injected around the entire circumference of the gap. After curing, the insulating adhesive 70 forms an insulating isolation ring, which can block potential conductive paths, effectively eliminate the risk of short circuits, and thus significantly improve the safety of the battery 100.

[0060] like Figure 6 As shown, in some embodiments of this utility model, the first end of the outer shell is the end close to the first lead-out portion 31 and the second lead-out portion 32, and the second end of the outer shell is the end away from the first lead-out portion 31 and the second lead-out portion 32. In this embodiment, the thickness of the outer shell between its first end and the groove 21 is less than the thickness of the outer shell between its second end and the groove 21. The side of the outer shell away from the groove 21 is flush with the outer shell, and the insulating adhesive 70 also covers the area between the first end of the outer shell and the groove 21 on the first side of the outer shell, thereby effectively preventing short circuits caused by contact between the lead-out piece and the outer shell.

[0061] According to one embodiment of the present invention, the connecting plate 62 is provided with a third insulating member 80 on the side opposite to the plate body portion 611, and the third insulating member 80 is located inside the clearance opening 22.

[0062] In this embodiment, as Figure 5 and Figure 6 As shown, the third insulating member 80 can be bonded to the side of the connecting plate 62 opposite to the plate body portion 611. The third insulating member 80 can separate the connecting plate 62 from the second lead portion 32, which can effectively avoid the risk of short circuit caused by accidental contact and effectively improve the safety of the battery 100.

[0063] In some specific embodiments of this utility model, the third insulating member 80 partially overlaps with the second insulating member 50.

[0064] Specifically, such as Figure 5 and Figure 6 As shown, the diameter of the clearance hole on the second insulating member 50 is smaller than the size of the third insulating member 80, so that the outer peripheral areas 621 of the second insulating member 50 and the third insulating member 80 overlap, thereby effectively preventing short circuits between the outer casing and the connecting plate 62 and the second lead-out portion 32, and effectively improving the safety of the battery 100.

[0065] According to one embodiment of the present invention, the first lead-out portion 31 abuts against the outer shell, and the second lead-out portion 32 abuts against the column portion 612.

[0066] In this embodiment, the electrical connection between the first lead-out portion 31 and the outer casing, and the electrical connection between the second lead-out portion 32 and the lead-out terminal 61, can both be achieved by direct contact between the two without the need for additional welding processes, thereby effectively simplifying the manufacturing process of the battery 100.

[0067] In some specific embodiments of this utility model, the first lead-out portion 31 is welded to the outer casing, and the second lead-out portion 32 is welded to the cylindrical portion 612. That is, in order to further improve the reliability and stability of the electrical connection, at least a portion of the first lead-out portion 31 can be welded to the outer casing, and at least a portion of the second lead-out portion 32 can be welded to the cylindrical portion 612 of the lead-out terminal 61.

[0068] In some optional embodiments of this utility model, the first lead-out portion 31 is connected to the outer shell by laser penetration welding, and the second lead-out portion 32 is connected to the column portion 612 by laser penetration welding.

[0069] Specifically, when welding the first lead-out portion 31 to the outer casing, laser welding equipment can be used to perform laser penetration welding on the side of the outer casing away from the column portion 612; when welding the second lead-out portion 32 to the column portion 612, laser welding equipment can be used to perform laser penetration welding on the second lead-out portion 32 to the column portion 612 at the clearance opening 22 of the outer casing. Using laser penetration welding allows the welding operation to be completed in a short time, significantly improving production efficiency, and effectively avoiding thermal damage to the bare battery cell 30 caused by welding.

[0070] In some specific embodiments of this utility model, the first side of the first lead-out portion 31 is attached to the inner wall surface of the outer casing. When manufacturing the battery 100, the first lead-out portion 31 is welded to the outer casing on the second side, which can effectively avoid weld marks on the outer surface of the outer casing and ensure the aesthetic appearance of the battery 100.

[0071] According to one embodiment of the present invention, the first insulating member 40 includes: an insulating layer, wherein a first metal layer is provided on the side of the insulating layer near the first lead-out portion 31, and the first metal layer is welded to the first lead-out portion 31; and / or, wherein a second metal layer is provided on the side of the insulating layer near the second lead-out portion 32, and the second metal layer is welded to the second lead-out portion 32.

[0072] In other words, the structure of the first insulating element 40 includes, but is not limited to, the following four cases: Case 1: The first insulating element 40 is an independently provided insulating layer, such as a rubber layer; Case 2: The first insulating member 40 includes a first metal layer and an insulating layer, wherein the first metal layer is disposed on the surface of the insulating layer near the first lead-out portion 31; Case 3: The first insulating member 40 includes a second metal layer and an insulating layer, wherein the second metal layer is disposed on the surface of the insulating layer on the side near the second lead-out portion 32; Case 4: The first insulating element 40 includes a first metal layer, a second metal layer and an insulating layer. The first metal layer is disposed on the surface of the insulating layer near the first lead-out portion 31, and the second metal layer is disposed on the surface of the insulating layer near the second lead-out portion 32.

[0073] When the laser welding power is high, the first metal layer is welded to the first lead-out portion 31, and the second metal layer is welded to the second lead-out portion 32. The first and second metal layers can protect the insulating layer, thereby effectively preventing damage to the insulating layer during welding and ensuring the reliability of the welding.

[0074] In some specific embodiments of this utility model, the first insulating member 40 is a diaphragm between the first electrode and the second electrode of the bare cell 30, the first lead-out portion 31 is provided with a first electrode material layer on the side near the diaphragm, and the second lead-out portion 32 is provided with a second electrode material layer on the side near the diaphragm.

[0075] In other words, the bare cell 30 includes a first electrode, a second electrode, and a separator between the first and second electrodes. The separator extends between the first lead-out portion 31 and the second lead-out portion 32 to form a first insulating member 40. The side of the first lead-out portion 31 away from the separator is an empty foil surface to facilitate welding to the casing; the side of the second lead-out portion 32 away from the separator is also an empty foil surface to facilitate welding to the lead-out terminal 61 (i.e., the pillar portion 612). Furthermore, the side of the first lead-out portion 31 closest to the separator is provided with a first electrode material layer (e.g., a negative electrode active material layer), and the side of the second lead-out portion 32 closest to the separator is provided with a second electrode material layer (e.g., a positive electrode active material layer), thereby effectively improving the energy density of the battery 100.

[0076] According to one embodiment of the present invention, the outer shell includes: a housing 10, wherein the housing 10 has an opening on a first side in the thickness direction, and the bare battery cell 30 is disposed inside the housing 10; a cover 20, wherein the cover 20 is welded to the side of the housing 10 where the opening is provided, and the clearance opening 22 is disposed on the cover 20 or the housing 10.

[0077] Specifically, the outer casing mainly consists of a housing 10 and a cover 20. The housing 10 is flat and has an opening on one side in the thickness direction, through which the bare battery cell 30 can be installed. The cover 20 is located on the opening side of the housing 10 and is used to close the opening of the housing 10. The cover 20 is welded to the housing 10. The clearance opening 22 can be provided on the cover 20 or on the second side of the housing 10 in the thickness direction.

[0078] In this embodiment, by providing an opening on one side of the casing 10 in the thickness direction, the internal structure assembly of the battery 100 is made more convenient, which can effectively improve the production efficiency of the battery 100.

[0079] In some specific embodiments of this utility model, both the groove 21 and the clearance opening 22 are provided on the cover 20, and the second insulating member 50 is bonded to the cover 20, with the outer contour of the second insulating member 50 corresponding to the outer contour of the wall of the groove 21. That is, before welding the cover 20 to the housing 10, the second insulating member 50 can be bonded to the inner side of the cover 20. During bonding, the outer contour of the groove 21 wall can be used as a positioning reference to quickly complete the alignment and bonding of the second insulating member 50, ensuring assembly accuracy and simplifying the process.

[0080] According to one embodiment of the present invention, the bare cell 30 has a wound structure, and the bare cell 30 includes a first electrode and a second electrode; wherein, the tail of the first electrode exposes a first current collector at least on the side away from the second electrode to form the first lead-out portion 31, and the tail of the second electrode exposes a second current collector at least on the side away from the first electrode to form the second lead-out portion 32.

[0081] In this embodiment, the bare cell 30 is a wound structure formed by winding a first electrode (e.g., a negative electrode), a separator, and a second electrode (e.g., a positive electrode). The tail of the negative electrode exposes the negative current collector on both sides of its thickness direction to form a first lead-out portion 31, or the tail of the negative electrode exposes the negative current collector on the side away from the second electrode to form a first lead-out portion 31. Similarly, the tail of the positive electrode exposes the positive current collector on both sides of its thickness direction to form a second lead-out portion 32, or the tail of the positive electrode exposes the positive current collector on the side away from the second electrode to form a second lead-out portion 32. This wound bare cell has a simple structure and is easy to manufacture and assemble.

[0082] In some specific embodiments of this utility model, the end face of the lead-out terminal 61 is rectangular, and the groove 21 is a rectangular groove; or, the end face of the lead-out terminal 61 is rectangular, and the groove 21 is a circular groove.

[0083] Specifically, the lead-out terminal 61 has opposing end faces in the thickness direction of the housing. These end faces can be circular or rectangular. When the end face of the lead-out terminal 61 is rectangular, the groove 21 on the housing is correspondingly set as a rectangular groove; when the end face of the lead-out terminal 61 is circular, the groove 21 on the housing is correspondingly set as a circular groove. The rectangular end face of the lead-out terminal 61 helps to increase the contact area between the lead-out terminal 61 and the second lead-out portion 32, thereby improving the charging and discharging efficiency of the battery 100.

[0084] According to the embodiment of this utility model, the battery 100 is manufactured by first assembling the outer casing, bare cell 30, first insulating component 40, and second insulating component 50 into a single unit to form the main body of the battery 100. Then, the main body of the battery 100 is dried. During drying, the gas generated inside the main body of the battery 100 can be discharged sequentially through the gas-liquid channel 41 and the relief port 22. After drying, electrolyte is injected into the main body of the battery 100 through the relief port 22. Finally, the main body of the battery 100 can be subjected to an open formation or a closed formation process. Finally, the cap assembly 60 is welded to the corresponding position on the outer casing.

[0085] In summary, the battery 100 according to the present invention can improve space utilization by stacking the first lead-out portion 31 and the second lead-out portion 32 along the thickness direction of the outer casing. It can increase the width of the first lead-out portion 31 and the second lead-out portion 32 in a limited space, thereby effectively increasing the contact area between the first lead-out portion 31 and the outer casing and the contact area between the second lead-out portion 32 and the lead-out terminal, thereby effectively improving the charging and discharging efficiency of the battery 100. Moreover, under the joint action of the first lead-out portion 31, the first insulating member 40, the second lead-out portion 32 and the second insulating member 50, the reliability of the electrical connection between the first lead-out portion 31 and the outer casing can be guaranteed.

[0086] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A battery, characterized in that, include: The outer casing has a clearance opening (22) on one side in the thickness direction. Bare battery cell (30), the bare battery cell (30) is disposed inside the housing, the bare battery cell (30) has a first lead-out portion (31) and a second lead-out portion (32) on one side of the length direction of the housing, the first lead-out portion (31) is connected to the side of the housing away from the clearance opening (22); The first insulating element (40) and the second insulating element (50) are stacked sequentially inside the outer shell, with the first lead-out portion (31), the first insulating element (40), the second lead-out portion (32) and the second insulating element (50) stacked in sequence. The second insulating member (50) is provided with a clearance hole, the clearance hole being positioned corresponding to the clearance opening (22); A cap assembly (60) is connected to the outside of the housing and blocks the clearance opening (22). The lead-out terminal (61) of the cap assembly (60) is insulated from the housing. The lead-out terminal (61) passes through the clearance opening (22) and the clearance hole and is connected to the second lead-out part (32).

2. The battery according to claim 1, characterized in that, The first insulating member (40) is provided with a gas-liquid channel (41) extending through its thickness direction. The second lead-out portion (32) and the second insulating member (50) avoid at least a portion of the gas-liquid channel (41), and at least a portion of the gas-liquid channel (41) corresponds to the position of the avoidance port (22) so that the battery can be filled with liquid through the avoidance port (22) when the cap assembly (60) is not installed.

3. The battery according to claim 2, characterized in that, The tail end of the second lead-out portion (32) extends to the edge of the gas-liquid channel (41) near the bare cell (30) to avoid the gas-liquid channel (41).

4. The battery according to claim 1, characterized in that, The outer shell is an arc-shaped outer shell, and the mating surface between the cap assembly (60) and the outer shell is a plane.

5. The battery according to claim 4, characterized in that, The outer casing has a groove (21) on one side in its thickness direction, and the bottom of the groove (21) has the clearance opening (22), and at least a portion of the cap assembly (60) is located in the groove (21).

6. The battery according to claim 1, characterized in that, The cap assembly (60) includes: Lead-out terminal (61), the lead-out terminal (61) includes a plate part (611) and a column part (612). The plate part (611) is provided at the first end of the column part (612), and the second end of the column part (612) passes through the relief opening (22) and the relief hole and is connected to the second lead-out part (32); A connecting plate (62) is sleeved on the column part (612) and located between the plate part (611) and the outer shell. An insulating sealing layer (63) is provided between the connecting plate (62) and the lead-out terminal (61). The insulating sealing layer (63) connects the connecting plate (62) and the lead-out terminal (61) into one unit. The connecting plate (62) is connected to the outer shell.

7. The battery according to claim 6, characterized in that, The insulating sealing layer (63) includes a first insulating sealing part and a second insulating sealing part. The first insulating sealing part is located between the plate part (611) and the connecting plate (62), and the second insulating sealing part is clamped between the column part (612) and the connecting plate (62).

8. The battery according to claim 6, characterized in that, The insulating sealing layer (63) is bonded to the plate body (611), and the connecting plate (62) is bonded to the insulating sealing layer (63).

9. The battery according to claim 6, characterized in that, The insulating sealing layer (63) and the plate body (611) are separated from the outer peripheral area (621) of the connecting plate (62), and the outer peripheral area (621) is welded to the outer shell.

10. The battery according to claim 6, characterized in that, The outer shell has a groove (21) on one side in its thickness direction, and the bottom of the groove (21) has the clearance opening (22). At least a portion of the plate part (611) is located in the groove (21). There is a gap between the outer periphery of the plate part (611) and the inner wall surface of the groove (21), and the gap is filled with insulating glue (70).

11. The battery according to claim 6, characterized in that, The connecting plate (62) has a third insulating member (80) on the side opposite to the plate body (611), and the third insulating member (80) is located inside the clearance opening (22).

12. The battery according to claim 11, characterized in that, The third insulating element (80) partially overlaps with the second insulating element (50).

13. The battery according to claim 6, characterized in that, The first lead-out portion (31) abuts against the outer shell, and the second lead-out portion (32) abuts against the column portion (612); and / or, the second lead-out portion (32) is welded to the column portion (612).

14. The battery according to claim 13, characterized in that, The first insulating element (40) includes: An insulating layer is provided with a first metal layer on the side of the insulating layer near the first lead-out portion (31), and the first metal layer is welded to the first lead-out portion (31); and / or, a second metal layer is provided on the side of the insulating layer near the second lead-out portion (32), and the second metal layer is welded to the second lead-out portion (32).

15. The battery according to claim 1, characterized in that, The first insulating member (40) is a separator between the first electrode and the second electrode of the bare cell (30). The first lead-out part (31) is provided with a first electrode material layer on the side near the separator, and the second lead-out part (32) is provided with a second electrode material layer on the side near the separator.

16. The battery according to claim 5, characterized in that, The outer casing includes: The housing (10) has an opening on a first side in its thickness direction, and the bare battery cell (30) is disposed inside the housing (10); The cover (20) is welded to the side of the housing (10) where the opening is provided, and the clearance opening (22) is provided on the cover (20) or the housing (10).

17. The battery according to claim 16, characterized in that, The groove (21) and the clearance opening (22) are both provided on the cover (20), and the second insulating member (50) is bonded to the cover (20). The outer contour of the second insulating member (50) corresponds to the outer contour of the wall of the groove (21).

18. The battery according to any one of claims 1 to 17, characterized in that, The bare cell (30) has a wound structure, and the bare cell (30) includes a first electrode and a second electrode; Wherein, the tail of the first electrode exposes a first current collector at least on the side away from the second electrode to form the first lead-out portion (31), and the tail of the second electrode exposes a second current collector at least on the side away from the first electrode to form the second lead-out portion (32).

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