Single battery and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a single battery and a battery pack. The operation opening is formed in the top cover piece of the single battery in a penetrating mode, at least parts of the tabs and the connecting pieces are exposed out of the operation opening, the tabs and the connecting pieces can be welded through the operation opening, the manufacturing difficulty of the single battery can be lowered, and the manufacturing efficiency can be improved. Moreover, the sealing cover covers the top cover sheet to seal the operation opening, specifically, the operation opening is provided with an inner wall surface, at least one part of the inner wall surface is a first inclined surface, the first inclined surface is arranged back to the battery cell, and the first inclined surface is connected with the peripheral surface of the sealing cover; the top cover sheet can be sealed while the manufacturing difficulty of the single battery is reduced and the manufacturing efficiency is improved. The second inclined plane plays a role in supporting the sealing cover on the basis of the first inclined plane, and due to the existence of the second inclined plane, the sealing cover is easier to be flatly placed when covering the top cover piece, and the sealing cover can be further facilitated to reliably seal the operation opening.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a single cell and a battery pack. Background Technology

[0002] In the field of power batteries, the industry typically addresses the electrical connection and current collection method for dual-cell batteries by unfolding the two cells of a single battery and placing them on either side of a connecting plate. First, the tabs are ultrasonically welded to the connecting plate, then the connecting plate is laser-welded to the terminals on the top cover to achieve electrical connection. Finally, the two unfolded cells are joined together and packaged. However, unfolding the two cells of a single battery occupies a very large space, and the equipment operation during the joining process is difficult, resulting in high manufacturing difficulty and low manufacturing efficiency for single batteries. Utility Model Content

[0003] This application provides a single-cell battery and a battery pack that can seal the top cover while reducing the manufacturing difficulty of the single-cell battery and improving manufacturing efficiency.

[0004] This application provides a single-cell battery. The single-cell battery has a first orientation. The single-cell battery includes a housing with a receiving cavity inside. The single-cell battery also includes a top cover assembly, which includes a top cover plate, terminals, and a connecting piece. The top cover plate is disposed on one end of the housing in the first orientation and seals the receiving cavity. An operation port and a terminal hole are provided through the top cover plate along the first orientation. The operation port and the terminal hole are spaced apart and communicate with the receiving cavity. The terminal is disposed in the terminal hole. The single-cell battery also includes a cell disposed in the receiving cavity. The cell includes a body and a tab connected to the body. The tab is electrically connected to the connecting piece, and the connecting piece is electrically connected to the terminal. At least a portion of the tab and the connecting piece are exposed on the top cover plate along the first orientation, protruding from the operation port. The single-cell battery also includes a sealing cap, which is disposed on the top cover plate to close the operation port. The operating port has an inner wall surface, which includes a first inclined surface and a second inclined surface. The first inclined surface and the second inclined surface are connected along a first direction. Both the first inclined surface and the second inclined surface are disposed away from the battery cell. The first inclined surface is connected to the outer peripheral surface of the sealing cover. The second inclined surface is configured to restrict the movement of the sealing cover toward the receiving cavity. The top cover includes a first top surface and a first bottom surface distributed along the first direction. The second inclined surface is closer to the first bottom surface than the first inclined surface. The angle between the first inclined surface and the first top surface is smaller than the angle between the second inclined surface and the first top surface.

[0005] In one embodiment of this application, the sealing cap includes a second top surface and a second bottom surface distributed along a first direction, and a third inclined surface connected between the second top surface and the second bottom surface. The second top surface is away from the receiving cavity relative to the second bottom surface, and the third inclined surface is disposed towards the receiving cavity. The third inclined surface cooperates with the first inclined surface to abut.

[0006] In one embodiment of this application, the sealing cap further includes a fourth inclined surface, which is connected between the second bottom surface and the third inclined surface. The fourth inclined surface is disposed towards the receiving cavity, and the angle between the third inclined surface and the second top surface is greater than the angle between the fourth inclined surface and the second top surface. The fourth inclined surface and the second inclined surface abut against each other.

[0007] In one embodiment of this application, the single cell further includes a first insulating member disposed on the side of the sealing cap facing the receiving cavity, and the first insulating member is configured such that the sealing cap is insulated from the tabs and connecting pieces.

[0008] In one embodiment of this application, the sealing cap has an injection hole; the first insulating member includes a first insulating main body, a guide part, and a first connecting part. The first insulating main body is connected to the sealing cap, the guide part is away from the sealing cap relative to the first insulating main body, the guide part is connected to the first insulating main body through the first connecting part, the guide part is disposed opposite to the injection hole, and the first connecting part surrounds the outer periphery of the injection hole; wherein, the first connecting part has an output port communicating with the injection hole; the guide part is configured to guide the electrolyte from the injection hole to be output from the output port.

[0009] In one embodiment of this application, the guide portion has a guide surface on the side facing the injection hole, the guide surface is bent in a direction away from the injection hole, and the guide surface is configured to guide the electrolyte from the injection hole to be output from the output port.

[0010] In one embodiment of this application, the first connecting portion includes at least two first sub-connecting portions and at least two second sub-connecting portions. The first sub-connecting portions and the second sub-connecting portions are alternately distributed along the circumference of the injection hole. The first sub-connecting portions are provided with an output port. Adjacent first sub-connecting portions and second sub-connecting portions are arranged at an angle.

[0011] In one embodiment of this application, one of the sealing cap and the first insulating member is provided with a fixing hole, and the other is provided with a fixing boss. The fixing boss is embedded in the fixing hole, so that the first insulating member is fixed to the sealing cap.

[0012] In one embodiment of this application, the single cell also has a second direction perpendicular to the first direction, and the single cell further includes a second insulating member, wherein the second insulating member includes: a second insulating main body portion disposed on the side of the top cover sheet facing the cell; a second connecting portion and a mating portion relative to the second insulating main body portion and close to the cell, the mating portion being located on the side of the second insulating main body portion in the second direction close to the operating port, and the mating portion being connected to the second insulating main body portion through the second connecting portion; the outer edge of the first insulating member abuts against the mating portion.

[0013] Accordingly, this application also provides a battery pack, including a housing and individual batteries as described in the above embodiments, wherein the individual batteries are disposed in the housing.

[0014] The beneficial effects of this application are as follows: Unlike existing technologies, this application provides a single-cell battery and a battery pack. The top cover of the single-cell battery has a through-hole for operation, with at least a portion of the tabs and connecting pieces exposed through the operation hole. This allows for welding of the tabs and connecting pieces via the operation hole, reducing the manufacturing difficulty and improving the manufacturing efficiency of the single-cell battery. Especially for single-cell batteries with two or more cells, the operation hole on the top cover, with at least a portion of the tabs and connecting pieces exposed, allows for welding of the tabs and connecting pieces after the cells are assembled. This simplifies the cell assembly process, reduces the difficulty of equipment operation during assembly, and thus reduces the manufacturing difficulty and improves the manufacturing efficiency of the single-cell battery.

[0015] Furthermore, this application provides a sealing cap that covers the top cover to seal the operating port. Specifically, the operating port has an inner wall surface, at least a portion of which is a first inclined surface. The first inclined surface faces away from the battery cell and connects to the outer peripheral surface of the sealing cap. This design can seal the top cover while reducing the manufacturing difficulty of individual batteries and improving manufacturing efficiency. A second inclined surface, based on the first inclined surface, supports the sealing cap. Due to the presence of the second inclined surface, the sealing cap is easier to lay flat when placed on the top cover, further facilitating a reliable seal of the operating port. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application;

[0018] Figure 2 yes Figure 1 The diagram shows the exploded structure of a single battery cell.

[0019] Figure 3 yes Figure 2 A schematic diagram of the structure of region A of the single cell shown;

[0020] Figure 4 This is a cross-sectional structural schematic diagram of a single cell embodiment of the present application;

[0021] Figure 5 yes Figure 4 A schematic diagram of the structure of region B of the single cell shown;

[0022] Figure 6This is an exploded structural diagram of an embodiment of the top cover sealing assembly of this application;

[0023] Figure 7 This is a top view of one embodiment of the sealing cap of this application;

[0024] Figure 8 yes Figure 7 A schematic diagram of the cross-sectional structure of the sealing cap in the CC direction;

[0025] Figure 9 yes Figure 8 The diagram shows the structure of area D of the sealing cap.

[0026] Figure 10 yes Figure 7 A bottom view of the sealing cap structure is shown.

[0027] Figure 11 This is a bottom view structural schematic diagram of an embodiment of the first insulating member of this application;

[0028] Figure 12 yes Figure 11 A schematic diagram of the cross-sectional structure of the first insulating component in the EE direction is shown.

[0029] Figure 13 yes Figure 12 The diagram shows the structure of the first insulating component, region F.

[0030] Explanation of reference numerals in the attached figures:

[0031] 10 Single cell; 11 Casing; 12 Top cover assembly; 121 Top cover piece; 1211 First top surface; 1212 First bottom surface; 122 Terminal post; 123 Operation port; 1231 First inclined surface; 1232 Second inclined surface; 13 Receiving cavity; 14 Cell; 141 Body; 15 Tab; 16 Connecting piece; 161 Clearance hole; 17 Top cover sealing assembly; 171 Sealing cover; 1711 Second top surface; 1712 Second bottom surface; 1713 Third inclined surface; 1714 Fourth inclined surface; 1715 Injection hole; 1716 Injection boss; 172 First insulating component; 1721 First insulating main body; 1722 Guide part; 1723 First connecting part; 1724 Output port; 1725 Guide surface; 1726 First sub-connecting part; 1727 Second sub-connecting part; 181 Fixing hole; 182 Fixing boss; 19 Second insulating component; 191 Second insulating main body; 192 Mating part; 193 Second connecting part. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to up, down, left, and right in the actual use or working state of the device, specifically the drawing directions in the accompanying drawings.

[0033] In this application, unless otherwise expressly specified and limited, the terms "connected," "linked," "stacked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] This application provides a single-cell battery and a battery pack, which are described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0035] To address the technical problems of high manufacturing difficulty and low manufacturing efficiency of single-cell batteries in the prior art, one embodiment of this application provides a single-cell battery. The single-cell battery has a first orientation. The single-cell battery includes a housing with a receiving cavity within it. The single-cell battery also includes a top cover assembly, which includes a top cover sheet, terminals, and a connecting piece. The top cover sheet is disposed at one end of the housing in the first orientation and seals the receiving cavity. An operation port and a terminal hole are provided through the top cover sheet along the first orientation. The operation port and the terminal hole are spaced apart and communicate with the receiving cavity. The terminal is disposed in the terminal hole. The single-cell battery also includes a cell disposed in the receiving cavity. The cell includes a body and a tab connected to the body. The tab is electrically connected to the connecting piece, and the connecting piece is electrically connected to the terminal. At least a portion of the tab and the connecting piece are exposed above the operation port along the first orientation on the top cover sheet. The single-cell battery also includes a sealing cap disposed on the top cover sheet to close the operation port. The operating port has an inner wall surface, which includes a first inclined surface and a second inclined surface. The first and second inclined surfaces are connected along a first direction and are both positioned away from the battery cell. The first inclined surface is connected to the outer peripheral surface of the sealing cover, and the second inclined surface is configured to restrict the movement of the sealing cover toward the receiving cavity. The top cover includes a first top surface and a first bottom surface distributed along the first direction, and the second inclined surface is closer to the first bottom surface than the first inclined surface. The angle between the first inclined surface and the first top surface is smaller than the angle between the second inclined surface and the first top surface. This will be described in detail below.

[0036] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application.

[0037] In one embodiment, the battery pack includes a housing and a plurality of individual battery cells 10 housed within the housing. The individual battery cells 10 include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this disclosure does not limit the specific types. The battery pack provides power to an electrical device. The electrical device can be a mobile phone, portable device, laptop computer, electric vehicle, electric car, ship, spacecraft, electric toy, or power tool, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0038] The following describes the single-cell battery 10 of the present application.

[0039] Please refer to the following: Figures 2 to 5 , Figure 2yes Figure 1 The diagram shows the exploded structure of a single battery cell. Figure 3 yes Figure 2 The diagram shows the structure of region A of the single cell. Figure 4 This is a cross-sectional structural schematic diagram of a single cell embodiment of the present application. Figure 5 yes Figure 4 The diagram shows the structure of region B of the single cell.

[0040] In one embodiment, the single-cell battery 10 has a first direction Z. The single-cell battery 10 includes a housing 11, and a receiving cavity 13 is provided inside the housing 11. The single-cell battery 10 also includes a top cover assembly 12, which includes a top cover plate 121, an electrode post 122, and a connecting piece 16. The top cover plate 121 covers one end of the housing 11 in the first direction Z and seals the receiving cavity 13. An operation port 123 and an electrode post hole are provided through the top cover plate 121 along the first direction Z, that is, the operation port 123 and the electrode post hole are both provided through the top cover plate 121 along the first direction Z. The electrode post 122 is disposed in the electrode post hole. The operation port 123 is spaced apart from the electrode post hole and communicates with the receiving cavity 13.

[0041] The single battery cell 10 also includes a cell 14, which is disposed in the accommodating cavity 13 and electrically connected to the terminal post 122 via a connecting piece 16. Specifically, the cell 14 includes a body 141 and a tab 15 connected to the body 141. The tab 15 is electrically connected to the connecting piece 16, and the connecting piece 16 is electrically connected to the terminal post 122. At least a portion of the tab 15 and the connecting piece 16 are exposed at the operating opening 123 along the first direction Z on the top cover plate 121.

[0042] The single battery cell 10 also includes a top cover sealing assembly 17, which covers the top cover sheet 121 to close the operation port 123. Specifically, the top cover sealing assembly 17 includes a sealing cover 171, which covers the top cover sheet 121 to close the operation port 123. Specifically, the operation port 123 has an inner wall surface, at least a portion of which is a first inclined surface 1231. The first inclined surface 1231 is disposed away from the battery cell 14 and is connected to the outer peripheral surface of the sealing cover 171.

[0043] In this embodiment, the top cover 121 of the single battery cell 10 has an operating port 123 extending through it. At least a portion of the tabs 15 and connecting pieces 16 are exposed through the operating port 123. Welding of the tabs 15 and connecting pieces 16 can be performed through the operating port 123, which reduces the manufacturing difficulty of the single battery cell 10 and improves manufacturing efficiency. Especially for single batteries 10 with two or more cells 14, the operating port 123 on the top cover 121, with at least a portion of the tabs 15 and connecting pieces 16 exposed through the operating port 123, allows welding of the tabs 15 and connecting pieces 16 to be performed through the operating port 123 after the cells 14 are assembled. This simplifies the assembly of the cells 14, reduces the difficulty of equipment operation during the assembly process, and thus reduces the manufacturing difficulty of the single battery cell 10 and improves manufacturing efficiency.

[0044] For example, Figure 4 An exemplary embodiment is shown where a single battery cell 10 has two cells 14. A clearance hole 161 is provided in the center of the connecting piece 16. First, the two cells 14 of the single battery cell 10 are joined together. Then, the tabs 15 of each cell 14 pass through the clearance hole 161 along the first direction Z and fold over to the side of the connecting piece 16 facing the top cover plate 121. An operating port 123 exposes at least a portion of the tabs 15 and the connecting piece 16, and welding of the tabs 15 to the connecting piece 16 is performed through the operating port 123. This embodiment simplifies the joining action of the cells 14 by joining them together first, and reduces the difficulty of equipment operation during the joining process. Therefore, it can reduce the manufacturing difficulty of the single battery cell 10 and improve manufacturing efficiency. Furthermore, compared to the ultrasonic welding used between the tab 15 and the connecting piece 16 in the prior art, this embodiment uses laser welding between the tab 15 and the connecting piece 16. Laser welding has a higher effective melting area coefficient and avoids the risks caused by burrs generated by ultrasonic welding.

[0045] Furthermore, this application provides a sealing cap 171 covering the top cover plate 121 to close the operation port 123. Specifically, the operation port 123 has an inner wall surface, at least a portion of which is a first inclined surface 1231. The first inclined surface 1231 is disposed away from the cell 14 and is connected to the outer peripheral surface of the sealing cap 171. The first inclined surface 1231 is inclined relative to the first direction Z. The first inclined surface 1231 is configured to restrict the movement of the sealing cap 171 toward the cell 14, so that the sealing cap 171 reliably closes the operation port 123. Therefore, it is possible to seal the top cover plate 121 while reducing the manufacturing difficulty of the single cell 10 and improving manufacturing efficiency.

[0046] In one embodiment, the inner wall surface of the operating port 123 further includes a second inclined surface 1232, and the first inclined surface 1231 and the second inclined surface 1232 are connected along a first direction Z. The second inclined surface 1232 is inclined relative to the first direction Z. The top cover plate 121 includes a first top surface 1211 and a first bottom surface 1212 distributed along the first direction Z, and the second inclined surface 1232 is closer to the first bottom surface 1212 relative to the first inclined surface 1231. The angle between the first inclined surface 1231 and the first top surface 1211 is smaller than the angle between the second inclined surface 1232 and the first top surface 1211, and the second inclined surface 1232 is configured to restrict the movement of the sealing cap 171 toward the receiving cavity 13.

[0047] In this embodiment, the second inclined surface 1232 supports the sealing cover 171 based on the first inclined surface 1231. Due to the presence of the second inclined surface 1232, the sealing cover 171 is easier to lay flat when it is placed on the top cover plate 121, which further facilitates the sealing cover 171 to reliably close the operation port 123.

[0048] Please refer to the following: Figures 6 to 10 , Figure 6 This is an exploded structural diagram of an embodiment of the top cover sealing assembly of this application. Figure 7 This is a top view schematic diagram of an embodiment of the sealing cap of this application. Figure 8 yes Figure 7 The diagram shows a cross-sectional view of the sealing cap along the CC direction. Figure 9 yes Figure 8 The diagram shows the structure of region D of the sealing cap. Figure 10 yes Figure 7 The diagram shows a bottom view of the sealing cap.

[0049] In one embodiment, the sealing cap 171 includes a second top surface 1711 and a second bottom surface 1712 distributed along a first direction Z, and a third inclined surface 1713 connecting the second top surface 1711 and the second bottom surface 1712. The second top surface 1711 is away from the receiving cavity 13 relative to the second bottom surface 1712, and the third inclined surface 1713 is disposed towards the receiving cavity 13. The third inclined surface 1713 abuts against the first inclined surface 1231. The third inclined surface 1713 is inclined relative to the first direction Z.

[0050] In this embodiment, the outer wall of the sealing cover 171 is provided with a third inclined surface 1713. The third inclined surface 1713 abuts against the first inclined surface 1231 of the operating port 123, ensuring that the sealing cover 171 reliably seals the operating port 123. Furthermore, in this embodiment, the sealing cover 171 and the operating port 123 are mutually fitted through the first inclined surface 1231 and the third inclined surface 1713. The inclined surface design of the first inclined surface 1231 and the third inclined surface 1713 can prevent the laser used for welding from directly entering the accommodating cavity 13 between the first inclined surface 1231 and the third inclined surface 1713, thereby preventing damage to the internal components of the single battery cell 10 due to direct laser irradiation.

[0051] In alternative embodiments, such as Figure 9 As shown, the sealing cover 171 also includes a fourth inclined surface 1714. The fourth inclined surface 1714 is inclined relative to the first direction Z. The fourth inclined surface 1714 connects the second bottom surface 1712 and the third inclined surface 1713, and is oriented towards the receiving cavity 13. The angle between the third inclined surface 1713 and the second top surface 1711 is greater than the angle between the fourth inclined surface 1714 and the second top surface 1711. The fourth inclined surface 1714 abuts against the second inclined surface 1232. In this way, the outer wall of the sealing cover 171, through the provision of the fourth inclined surface 1714, abuts against the second inclined surface 1232 of the operating port 123. The second inclined surface 1232 and the fourth inclined surface 1714 fit together, allowing the second inclined surface 1232 to more reliably support the sealing cover 171, further facilitating the reliable sealing of the operating port 123 by the sealing cover 171.

[0052] It should be noted that, Figure 5 An example is shown where the sealing cap 171 is provided with only the third bevel 1713 and without the fourth bevel 1714.

[0053] Please refer to the following: Figures 11 to 13 , Figure 11 This is a bottom view structural diagram of an embodiment of the first insulating member of this application. Figure 12 yes Figure 11 The diagram shows a cross-sectional view of the first insulating element along the EE direction. Figure 13 yes Figure 12 The diagram shows the structure of the first insulating component, region F.

[0054] In one embodiment, the top cover sealing assembly 17 further includes a first insulating member 172 disposed on the side of the sealing cover 171 facing the receiving cavity 13, and the first insulating member 172 is configured such that the sealing cover 171 is insulated from the tab 15 and the connecting piece 16.

[0055] Specifically, the sealing cap 171 has an injection hole 1715 through which electrolyte is injected into the receiving cavity 13. The first insulating member 172 includes a first insulating main body 1721, a guide portion 1722, and a first connecting portion 1723. The first insulating main body 1721 is connected to the sealing cap 171. The guide portion 1722 is located away from the sealing cap 171 relative to the first insulating main body 1721. The guide portion 1722 is connected to the first insulating main body 1721 through the first connecting portion 1723. The guide portion 1722 is disposed opposite to the injection hole 1715. The first connecting portion 1723 surrounds the outer periphery of the injection hole 1715. The first connecting portion 1723 has an output port 1724 communicating with the injection hole 1715. The guide portion 1722 is configured to guide the electrolyte from the injection hole 1715 to be output from the output port 1724.

[0056] In the above-described manner, during the electrolyte injection process, to ensure injection efficiency, the electrolyte is typically injected into the injection hole 1715 at a certain pressure. Therefore, the electrolyte flow rate at the injection hole 1715 is relatively fast. If the electrolyte directly impacts the battery cell 14 from top to bottom, it can easily disrupt the diaphragm of the battery cell 14. Therefore, in this embodiment, the guide portion 1722 is positioned opposite to the injection hole 1715. The electrolyte injected from the injection hole 1715 is blocked by the guide portion 1722 and, guided by the guide portion 1722, is output from the side outlet 1724. In this embodiment, the guide portion 1722 can change the flow direction of the electrolyte, minimizing direct impact on the battery cell 14 and preventing the electrolyte from disrupting the diaphragm of the battery cell 14.

[0057] Furthermore, the guide portion 1722 has a guide surface 1725 on the side facing the injection hole 1715. The guide surface 1725 is bent away from the injection hole 1715 and is configured to guide the electrolyte from the injection hole 1715 to be output from the output port 1724. In this way, since the guide surface 1725 is bent away from the injection hole 1715 in this embodiment, the guide surface 1725 can guide the electrolyte to flow away from the cell 14 after being output from the output port 1724, further avoiding direct impact of the electrolyte on the cell 14.

[0058] Furthermore, the first connecting portion 1723 includes at least two first sub-connecting portions 1726 and at least two second sub-connecting portions 1727. The first sub-connecting portions 1726 and second sub-connecting portions 1727 are alternately distributed along the circumference of the injection hole 1715. The first sub-connecting portions 1726 have an output port 1724, and adjacent first sub-connecting portions 1726 and second sub-connecting portions 1727 are arranged at an angle. In other words, in this embodiment, the guide portion 1722 and the first connecting portion 1723 constitute a polygonal boss structure that protrudes relative to the first insulating body portion 1721. The number of first sub-connecting portions 1726 and second sub-connecting portions 1727 is usually even, so that the first insulating member 172 has multiple output ports 1724, and each output port 1724 is evenly spaced along the circumference of the first insulating member 172. Figure 13 An example is shown where the output port 1724 covers the entire first sub-connection portion 1726. Of course, the output port 1724 may also cover only a portion of the first sub-connection portion 1726.

[0059] In one embodiment, one of the sealing cap 171 and the first insulating member 172 is provided with a fixing hole 181, and the other is provided with a fixing boss 182. The fixing boss 182 is embedded in the fixing hole 181, so that the first insulating member 172 is fixed to the sealing cap 171. The sealing cap 171 and the first insulating member 172 can be connected by means of heat fusion or the like, specifically, the fixing boss 182 can be heat-fused to the fixing hole 181.

[0060] Figure 10 and Figure 12 An exemplary illustration shows a sealing cap 171 with fixing holes 181 and a first insulating member 172 with fixing bosses 182. There are multiple fixing holes 181, spaced apart along the outer periphery of the injection hole 1715. There are also multiple fixing bosses 182, and the number of fixing bosses 182 corresponds to the number of fixing holes 181. The fixing bosses 182 are spaced apart along the outer periphery of the first connecting portion 1723.

[0061] In one embodiment, the single cell 10 further has a second direction X perpendicular to the first direction Z. The single cell 10 also includes a second insulating member 19, which is disposed on the side of the top cover 121 facing the cell 14. The second insulating member 19 is configured to insulate the top cover 121 and the cell 14 from each other. The second insulating member 19 may be made of a material such as plastic.

[0062] Specifically, the second insulating member 19 includes a second insulating main body 191, a second connecting portion 193, and a mating portion 192. The second insulating main body 191 is disposed on the side of the top cover plate 121 facing the battery cell 14. The mating portion 192 is located opposite the second insulating main body 191 and close to the battery cell 14. The mating portion 192 is located on the side of the second insulating main body 191 in the second direction X, close to the operating port 123. The mating portion 192 is connected to the second insulating main body 191 through the second connecting portion 193. The outer edge of the first insulating member 172 abuts against the mating portion 192. In this way, the first insulating member 172 and the second insulating member 192 cooperate with each other to insulate the sealing cover 171 from the tab 15 and the connecting piece 16.

[0063] In one embodiment, the single cell 10 further has a third direction Y. The first direction Z, the second direction X, and the third direction Y are all perpendicular to each other.

[0064] like Figure 7 and Figure 8 As shown, the dimension of the sealing cap 171 in the third direction Y is W1 mm, satisfying: 50≤W1≤200. The dimension of the sealing cap 171 in the second direction X is W2 mm, satisfying: 20≤W2≤80. The outer edge contour of the sealing cap 171 has a rounded corner with a radius of R1 mm, satisfying: 1≤R1≤10. The dimension of the sealing cap 171 in the first direction Z is H1 mm, satisfying: 0.5≤H1≤3. The sealing cap 171 is provided with a liquid injection boss 1716, which protrudes towards the battery cell 14, and a liquid injection hole 1715 is formed on the liquid injection boss 1716. The dimension of the liquid injection boss 1716 in the first direction Z is H2 mm, satisfying: 0.1H1≤H2≤1.2H1.

[0065] like Figure 9As shown, the angle between the third inclined surface 1713 and the second top surface 1711 is θ1, satisfying: 60°≤θ1<90°. The dimension of the third inclined surface 1713 in the first direction Z is H3 mm, satisfying: 0.5H1≤H3≤0.8H1. The angle between the fourth inclined surface 1714 and the second top surface 1711 is θ2, satisfying: θ2<θ1, and 45°≤θ2≤80°. By reasonably setting the angle between the third inclined surface 1713 and the second top surface 1711 and the dimension of the third inclined surface 1713 in the first direction Z, on the one hand, the laser used for welding is prevented from directly entering the accommodating cavity 13 between the sealing cover 171 and the top cover plate 121 as much as possible; on the other hand, sufficient welding penetration is ensured between the sealing cover 171 and the top cover plate 121, guaranteeing a stable and reliable connection between the sealing cover 171 and the top cover plate 121, further facilitating the reliable sealing of the operating port 123 by the sealing cover 171. Furthermore, by reasonably setting the included angle between the fourth inclined surface 1714 and the second top surface 1711, the second inclined surface 1232 can more reliably support the sealing cover 171, which further facilitates the sealing cover 171 to reliably close the operating port 123.

[0066] like Figures 11 to 13 As shown, the first insulating member 172 has a dimension of W3 mm in the third direction Y, satisfying: 0.8W1≤W3≤W1. The first insulating member 172 has a dimension of W4 mm in the second direction X, satisfying: 0.8W2≤W4≤W2. The outer edge contour of the first insulating member 172 has a rounded corner with a radius of R2 mm, satisfying: 0.8R1≤R2≤R1. The first connecting portion 1723 has a dimension of W5 mm in the third direction Y, satisfying: 5≤W5≤20. The first insulating body portion 1721 of the first insulating member 172 has a dimension of H4 mm in the first direction Z, satisfying: 0.2H1≤H4≤H1. The fixing boss 182 has a dimension of H5 mm in the first direction Z, satisfying: 0.2H1≤H5≤0.7H1. The guide portion 1722 and the first connecting portion 1723 have a dimension of H6 mm in the first direction Z, satisfying: 2H2≤H6≤5H2.

[0067] The angle between the outer edge tangent P of the guide surface 1725 and the first insulating main body 1721 is θ3, satisfying: 20°≤θ3≤45°. In other words, by reasonably setting the angle between the outer edge tangent of the guide surface 1725 and the first insulating main body 1721, this embodiment guides the electrolyte to flow away from the battery cell 14 after being output from the output port 1724, avoiding direct impact of the electrolyte on the battery cell 14. On the other hand, the angle between the outer edge tangent of the guide surface 1725 and the first insulating main body 1721 is not too large, minimizing the backflow of electrolyte output from the output port 1724.

[0068] In summary, this application provides a single-cell battery and a battery pack. The top cover of the single-cell battery has a through-hole, through which at least a portion of the tabs and connecting pieces are exposed. Welding of the tabs and connecting pieces can be performed through the through-hole, reducing the manufacturing difficulty and improving the manufacturing efficiency of the single-cell battery. Especially for single-cell batteries with two or more cells, the operating port on the top cover, with at least a portion of the tabs and connecting pieces exposed, allows welding of the tabs and connecting pieces to be performed after the cells are assembled. This simplifies the cell assembly process, reduces the difficulty of equipment operation during assembly, and thus reduces the manufacturing difficulty and improves the manufacturing efficiency of the single-cell battery.

[0069] Furthermore, this application provides a sealing cap that covers the top cover to seal the operating port. Specifically, the operating port has an inner wall surface, at least a portion of which is a first inclined surface. The first inclined surface faces away from the battery cell and connects to the outer peripheral surface of the sealing cap. This design can seal the top cover while reducing the manufacturing difficulty of individual batteries and improving manufacturing efficiency. A second inclined surface, based on the first inclined surface, supports the sealing cap. Due to the presence of the second inclined surface, the sealing cap is easier to lay flat when placed on the top cover, further facilitating a reliable seal of the operating port.

[0070] The single-cell battery and battery pack provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A single-cell battery, characterized in that, The single cell has a first orientation, and the single cell includes: A housing, wherein a receiving cavity is provided within the housing; The top cover assembly includes a top cover plate, an electrode post, and a connecting plate. The top cover plate covers one end of the housing in the first direction and seals the receiving cavity. An operation port and an electrode post hole are provided through the top cover plate along the first direction. The operation port and the electrode post hole are spaced apart and communicate with the receiving cavity. The electrode post is disposed in the electrode post hole. A battery cell, disposed in the accommodating cavity, includes a body and an electrode tab connected to the body. The electrode tab is electrically connected to the connecting piece, and the connecting piece is electrically connected to the terminal post. At least a portion of the electrode tab and the connecting piece protrudes from the operating port on the top cover plate along the first direction. A sealing cap is placed on the top cover to close the operating port; The operating port has an inner wall surface, which includes a first inclined surface and a second inclined surface. The first inclined surface and the second inclined surface are connected along the first direction and are both disposed away from the battery cell. The first inclined surface is connected to the outer peripheral surface of the sealing cover, and the second inclined surface is configured to restrict the movement of the sealing cover toward the receiving cavity. The top cover includes a first top surface and a first bottom surface distributed along the first direction, and the second inclined surface is closer to the first bottom surface than the first inclined surface. The angle between the first inclined surface and the first top surface is smaller than the angle between the second inclined surface and the first top surface.

2. The single-cell battery according to claim 1, characterized in that, The sealing cap includes a second top surface and a second bottom surface distributed along the first direction, and a third inclined surface connecting the second top surface and the second bottom surface. The second top surface is away from the receiving cavity relative to the second bottom surface, and the third inclined surface is disposed towards the receiving cavity. The third inclined surface cooperates with the first inclined surface to abut.

3. The single-cell battery according to claim 2, characterized in that, The sealing cover further includes a fourth inclined surface, which is connected between the second bottom surface and the third inclined surface. The fourth inclined surface is disposed towards the receiving cavity. The angle between the third inclined surface and the second top surface is greater than the angle between the fourth inclined surface and the second top surface. The fourth inclined surface and the second inclined surface cooperate to abut against each other.

4. The single-cell battery according to any one of claims 1 to 3, characterized in that, The single cell also includes a first insulating member disposed on the side of the sealing cover facing the receiving cavity, and the first insulating member is configured such that the sealing cover is insulated from the tab and the connecting piece.

5. The single-cell battery according to claim 4, characterized in that, The sealing cap is provided with a liquid injection hole; The first insulating component includes a first insulating main body, a guide portion, and a first connecting portion. The first insulating main body is connected to the sealing cap. The guide portion is located away from the sealing cap relative to the first insulating main body. The guide portion is connected to the first insulating main body through the first connecting portion. The guide portion is disposed opposite to the injection hole. The first connecting portion surrounds the outer periphery of the injection hole. The first connecting portion has an output port that communicates with the injection hole; the guiding portion is configured to guide the electrolyte from the injection hole to be output from the output port.

6. The single-cell battery according to claim 5, characterized in that, The guide portion has a guide surface on the side facing the injection hole, the guide surface is bent away from the injection hole, and the guide surface is configured to guide the electrolyte from the injection hole to be output from the output port.

7. The single-cell battery according to claim 5, characterized in that, The first connecting portion includes at least two first sub-connecting portions and at least two second sub-connecting portions. The first sub-connecting portions and the second sub-connecting portions are alternately distributed along the circumference of the injection hole. The first sub-connecting portion has the output port. Adjacent first sub-connecting portions and second sub-connecting portions are arranged at an angle.

8. The single-cell battery according to claim 4, characterized in that, One of the sealing cap and the first insulating member is provided with a fixing hole, and the other is provided with a fixing boss. The fixing boss is embedded in the fixing hole, so that the first insulating member is fixed to the sealing cap.

9. The single-cell battery according to claim 4, characterized in that, The individual battery cell also has a second direction perpendicular to the first direction, and the individual battery cell further includes a second insulating element. The second insulating element includes: The second insulating main body is disposed on the side of the top cover plate facing the battery cell; The second connecting part, and The mating part is located near the battery cell relative to the second insulating body part. The mating part is located on the side of the second insulating body part closer to the operating port in the second direction. The mating part is connected to the second insulating body part through the second connecting part. The outer edge of the first insulating member abuts against the mating part.

10. A battery pack, characterized in that, It includes a housing and a single battery cell as described in any one of claims 1 to 9, wherein the single battery cell is disposed in the housing.

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