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. A battery cell of the single battery comprises a first battery cell and a second battery cell which are oppositely arranged, the first battery cell comprises a first body and a first tab connected with the first body, the second battery cell comprises a second body and a second tab connected with the second body, and at least one of the first tab and the second tab is provided with an avoiding notch; and the projection of the avoiding gap in the third direction is positioned on the other one of the first tab and the second tab. By means of the mode, the bending jig can conveniently bend the tabs.

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] Currently, the tabs of the cells inside power batteries are usually bent and electrically connected to the connecting tabs, which in turn connect to the terminals on the top cover. For power batteries with multiple cells, there are usually two or more cells inside. Because the distance between the tabs of each cell is small, it is not convenient to use a bending fixture to bend the tabs. Utility Model Content

[0003] This application provides a single battery cell and a battery pack, which facilitates bending of the tabs using a bending fixture.

[0004] This application provides a single-cell battery. The single-cell battery has a first direction, a second direction, and a third direction, all of which intersect each other. The single-cell battery includes a housing with a receiving cavity within it. The single-cell battery also includes a top cover assembly, comprising a top cover plate, terminals, and a connecting piece. The top cover plate covers one end of the housing in the first direction and seals the receiving cavity. The top cover plate has a terminal hole and an operating port extending through it along the first direction. The terminal is disposed in the terminal hole and electrically connected to the connecting piece. The operating port and the terminal are spaced apart along the second direction and communicate with the receiving cavity. The single-cell battery also includes a battery cell disposed within the receiving cavity. The battery cell includes a first battery cell and a second battery cell arranged opposite to each other. The first battery cell includes a first body and a first electrode connected to the first body. The second battery cell includes a second body and a second electrode connected to the second body. The first electrode and the second electrode are distributed along a third direction. The connecting piece, the first electrode, and the second electrode are partially exposed on the top cover along a first direction, revealing the operation opening. At least one of the first electrode and the second electrode is provided with a clearance notch. The projection of the clearance notch in the third direction is located on the other of the first electrode and the second electrode.

[0005] In one embodiment of this application, the clearance notch includes a first clearance notch and a second clearance notch. A first electrode is provided with a first clearance notch, and a second electrode is provided with a second clearance notch. The first clearance notch and the second clearance notch are staggered along a second direction. The first electrode and the second electrode are electrically connected to the side of the connecting piece facing the top cover piece.

[0006] In one embodiment of this application, the first clearance notch is connected to the outer edge of the first electrode tab away from the first body, and the second clearance notch is connected to the outer edge of the second electrode tab away from the second body.

[0007] In one embodiment of this application, the connecting piece is located on the side of the first body and the second body facing the top cover piece, and a clearance hole is provided through the connecting piece along the first direction. The first electrode and the second electrode are both disposed in the clearance hole.

[0008] In one embodiment of this application, the clearance hole is located in the middle of the connecting piece in the third-party direction.

[0009] In one embodiment of this application, the first electrode includes a first connecting portion and a first bending portion. The first connecting portion is connected to the first body, and the first bending portion is connected to the side of the first connecting portion away from the first body. The second electrode includes a second connecting portion and a second bending portion. The second connecting portion is connected to the second body, and the second bending portion is connected to the side of the second connecting portion away from the second body. Both the first connecting portion and the second connecting portion pass through the clearance hole. Both the first bending portion and the second bending portion are located on the side of the connecting piece facing the top cover piece and are electrically connected to the connecting piece.

[0010] In one embodiment of this application, at least a portion of the first bend is farther away from the second tab relative to the first connecting portion, and the first bend and the connecting piece are electrically connected to the portion of the first body; at least a portion of the second bend is farther away from the first tab relative to the second connecting portion, and the second bend and the connecting piece are electrically connected to the portion of the second body.

[0011] In one embodiment of this application, the operating port is connected to the clearance hole.

[0012] In one embodiment of this application, the single cell further includes: a top cover sealing assembly, which covers the top cover sheet to close the operation port.

[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 single-cell battery cell includes a first cell and a second cell disposed opposite to each other. The first cell includes a first body and a first tab connected to the first body. The second cell includes a second body and a second tab connected to the second body. At least one of the first tab and the second tab is provided with a clearance notch, which is configured to allow a bending jig to pass through to bend the other of the first and second tabs, such that a portion of both the first and second tabs is bent and electrically connected to a connecting piece. In other words, by providing a clearance notch in at least one of the first and second tabs, this application facilitates the bending of the first and second tabs by a bending jig. The bending process of the first and second tabs is simple and reliable, which helps to ensure the production reliability of the single-cell battery.

[0015] Furthermore, the top cover of the single battery cell has a through-hole, through which at least a portion of the connecting piece, the first tab, and the second tab are exposed. This allows for welding of the connecting piece to the first and second tabs via the operating port, reducing the manufacturing difficulty and improving efficiency of the single battery cell. Especially for single batteries with two or more cells, the operating port on the top cover allows for welding of the connecting piece to the first and second tabs after the cells are assembled, simplifying the cell assembly process and reducing the operational difficulty of the equipment during assembly. Therefore, it reduces the manufacturing difficulty of the single battery cell and improves manufacturing efficiency. 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 top view of one embodiment of the top cover assembly and battery cell of this application;

[0021] Figure 5 yes Figure 4 A schematic diagram of the cross-sectional structure of the top cover assembly and the battery cell along the BB direction is shown.

[0022] Figure 6 This is a schematic diagram of the structure of one embodiment of the battery cell of this application;

[0023] Figure 7 yes Figure 6 The diagram shows the structure of region C of the battery cell.

[0024] Figure 8 This is a schematic diagram of the structure of one embodiment of the electrode of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 10 Single cell; 11 Casing; 12 Top cover assembly; 121 Top cover piece; 122 Terminal; 123 Operation port; 13 Receiving cavity; 14 Cell; 14a First cell; 14b Second cell; 141 Body; 141a First body; 141b Second body; 142 Tab; 142a First tab; 142b Second tab; 1421a First connecting part; 1421b Second connecting part; 1422a First bending part; 1422b Second bending part; 15 Connecting piece; 151 Clearance hole; 16 Clearance notch; 161 First clearance notch; 162 Second clearance notch; 17 Top cover sealing assembly. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] 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.

[0030] To address the technical problem that bending fixtures in the prior art are inconvenient for bending the tabs, one embodiment of this application provides a single-cell battery. The single-cell battery has a first direction, a second direction, and a third direction, all of which intersect each other. The single-cell battery includes a housing with a receiving cavity inside. The single-cell battery also includes a top cover assembly, comprising a top cover plate, a terminal post, and a connecting piece. The top cover plate covers one end of the housing in the first direction and seals the receiving cavity. A terminal post hole and an operating port are provided through the top cover plate along the first direction. The terminal post is disposed in the terminal post hole and is electrically connected to the connecting piece. The operating port and the terminal post are spaced apart along the second direction and communicate with the receiving cavity. The single-cell battery also includes a battery cell disposed within the receiving cavity. The battery cell includes a first battery cell and a second battery cell disposed opposite to each other. The first battery cell includes a first body and a first electrode connected to the first body. The second battery cell includes a second body and a second electrode connected to the second body. The first electrode and the second electrode are distributed along a third direction. The connecting piece, the first electrode, and the portion of the second electrode along the first direction on the top cover plate exposes the operating opening. At least one of the first electrode and the second electrode is provided with a clearance notch. The projection of the clearance notch in the third direction is located on the other of the first electrode and the second electrode. This will be described in detail below.

[0031] Please see Figures 1 to 4 , Figure 1 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application. Figure 2 yes 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 top view of an embodiment of the top cover assembly and battery cell of this application.

[0032] 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.

[0033] The following describes the single-cell battery 10 of the present application.

[0034] Please refer to the following: Figures 5 to 7 , Figure 5 yes Figure 4 The diagram shows a cross-sectional view of the top cover assembly and the battery cell along the BB direction. Figure 6 This is a schematic diagram of the structure of one embodiment of the battery cell of this application. Figure 7 yes Figure 6 The diagram shows the structure of region C of the battery cell.

[0035] In one embodiment, the single cell 10 has a first direction Z, a second direction X, and a third direction Y, wherein the first direction Z, the second direction X, and the third direction Y intersect each other, or specifically, the first direction Z, the second direction X, and the third direction Y are perpendicular to each other.

[0036] The single-cell battery 10 includes a housing 11, within which a receiving cavity 13 is provided. The single-cell battery 10 also includes a top cover assembly 12, which includes a top cover plate 121, a terminal post 122, and a connecting piece 15. The top cover plate 121 covers one end of the housing 11 in a first direction Z and seals the receiving cavity 13. A terminal post hole and an operation port 123 are provided through the top cover plate 121 along the first direction Z; that is, both the terminal post hole and the operation port 123 are provided through the top cover plate 121 along the first direction Z. The terminal post 122 is disposed in the terminal post hole and is electrically connected to the connecting piece 15. The operation port 123 is spaced apart from the terminal post 122 along a second direction X and communicates with the receiving cavity 13.

[0037] The single battery cell 10 also includes a cell 14, which is disposed in the accommodating cavity 13 and is electrically connected to the terminal post 122 via a connecting piece 15. Specifically, the cell 14 includes a body 141 and a tab 142 connected to the body 141. The tab 142 is electrically connected to the connecting piece 15 so as to be electrically connected to the terminal post 122 via the connecting piece 15.

[0038] The battery cell 14 includes a first battery cell 14a and a second battery cell 14b disposed opposite to each other, and the first battery cell 14a and the second battery cell 14b are distributed along a third direction Y. The first battery cell 14a includes a first body 141a and a first electrode tab 142a connected to the first body 141a, and the second battery cell 14b includes a second body 141b and a second electrode tab 142b connected to the second body 141b. The first electrode tab 142a and the second electrode tab 142b are distributed along a third direction Y. The connecting piece 15, the first electrode tab 142a, and the second electrode tab 142b are partially exposed on the top cover piece 121 along a first direction Z, with the operating opening 123 exposed. At least one of the first electrode tab 142a and the second electrode tab 142b is provided with a clearance notch 16, and the projection of the clearance notch 16 in the third direction Y is located on the other of the first electrode tab 142a and the second electrode tab 142b. The clearance notch 16 is configured to allow a bending fixture to pass through to bend the other of the first tab 142a and the second tab 142b, such that a portion of the first tab 142a and a portion of the second tab 142b are both bent and electrically connected to the connecting piece 15.

[0039] In this manner, an operation port 123 is provided through the top cover plate 121, and at least a portion of the connecting piece 15, the first tab 142a, and the second tab 142b are exposed through the operation port 123. Welding of the first tab 142a and the second tab 142b to the connecting piece 15 can be performed through the operation 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 operation port 123 provided in this embodiment, with at least a portion of the connecting piece 15, the first tab 142a, and the second tab 142b exposed through the operation port 123, allows welding of the first tab 142a and the second tab 142b to the connecting piece 15 after the cells 14 are assembled. This simplifies the cell assembly process, reduces the difficulty of equipment operation during assembly, and thus reduces the manufacturing difficulty of the single battery cell 10 and improves manufacturing efficiency.

[0040] In existing technologies, for a single battery cell 10 with two or more cells 14, the two cells 14 are typically laid out and placed on both sides of a connecting piece 15. First, the tabs 142 are ultrasonically welded to the connecting piece 15. Then, the connecting piece 15 is laser-welded to the terminals 122 on the top cover to achieve electrical connection. Finally, the two laid-out cells 14 are joined together and placed into a casing. However, laying out the two cells 14 of the single battery cell 10 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 the single battery cell 10.

[0041] In the prior art, the core-joining operation is performed after the tabs 142 are soldered. The position of the battery cell 14 changes before and after this core-joining operation, resulting in a certain length redundancy in the tabs 142 after core-joining. This redundant tab 142 is prone to being inserted backwards into the electrode sheet. Therefore, in this embodiment, the first battery cell 14a and the second battery cell 14b are first joined together, and then the first tabs 142a and the second tabs 142b are electrically connected to the connecting piece 15. This minimizes the redundant length of the first tabs 142a and the second tabs 142b, greatly reducing the risk of them being inserted backwards into the electrode sheet.

[0042] Because the distance between the first battery cell 14a and the second battery cell 14b is small, the distance between the first tab 142a and the second tab 142b is also small. This makes it difficult for the conventional tab 142 bending process to bend the first tab 142a and the second tab 142b using a bending fixture. In view of this, in this embodiment, at least one of the first tab 142a and the second tab 142b is provided with a clearance notch 16. The clearance notch 16 is configured to allow the bending fixture to pass through to bend the other of the first tab 142a and the second tab 142b, so that a portion of the first tab 142a and a portion of the second tab 142b are bent and electrically connected to the connecting piece 15. In other words, by providing an avoidance notch 16 in at least one of the first tab 142a and the second tab 142b in this embodiment, even if the distance between the first tab 142a and the second tab 142b is small, it is easy for the bending fixture to bend the first tab 142a and the second tab 142b. The bending process of the first tab 142a and the second tab 142b is simple and reliable, which is conducive to ensuring the production reliability of the single cell 10.

[0043] In one embodiment, the single cell 10 further includes a top cover sealing assembly 17, which covers the top cover sheet 121 to close the operation port 123. In this embodiment, the top cover sealing assembly 17 reliably closes the operation port 123, thereby reducing the manufacturing difficulty of the single cell 10 and improving manufacturing efficiency while sealing the top cover sheet 121.

[0044] In one embodiment, the clearance notch 16 includes a first clearance notch 161 and a second clearance notch 162. A first tab 142a is provided with the first clearance notch 161, and a second tab 142b is provided with the second clearance notch 162. The first clearance notch 161 and the second clearance notch 162 are staggered along a second direction X. The projection of the first clearance notch 161 onto a third direction Y is located on the second tab 142b, and the projection of the second clearance notch 162 onto a third direction Y is located on the first tab 142a. The first clearance notch 161 and the second clearance notch 162 are configured to allow different bending fixtures to pass through simultaneously, such that the first tab 142a and the second tab 142b are electrically connected to the side of the connecting piece 15 facing the top cover piece 121.

[0045] A bending fixture for bending the first electrode tab 142a moves from the side of the second electrode tab 142b opposite to the first electrode tab 142a toward the first electrode tab 142a. The bending fixture passes through the second clearance notch 162 on the second electrode tab 142b and abuts against the first electrode tab 142a, thereby bending the first electrode tab 142a. A bending fixture for bending the second electrode tab 142b moves from the side of the first electrode tab 142a opposite to the second electrode tab 142b toward the second electrode tab 142b. The bending fixture passes through the first clearance notch 161 on the first electrode tab 142a and abuts against the second electrode tab 142b, thereby bending the second electrode tab 142b.

[0046] This embodiment provides a highly efficient tab 142 bending process for a multi-core single-cell battery 10. Even if the distance between the first tab 142a and the second tab 142b is small, the bending fixture can easily bend the first tab 142a and the second tab 142b. Furthermore, since both the first tab 142a and the second tab 142b are provided with clearance notches 16 (i.e., the first clearance notch 161 and the second clearance notch 162) in this embodiment, the bending fixture that bends the first tab 142a and the second tab 142b can perform the bending operation simultaneously, which can shorten the bending process time and improve the production efficiency of the single-cell battery 10.

[0047] Of course, in other embodiments of this application, only one of the first tab 142a and the second tab 142b may be provided with a clearance notch 16. The bending fixture passes through the clearance notch 16 to bend the tab 142 without the clearance notch 16 first. After the tab 142 without the clearance notch 16 is bent, the bending fixture is then used to bend the tab 142 with the clearance notch 16. This can reduce the impact of the clearance notch 16 on the current carrying capacity of the tab 142. The embodiments of this application are described using the example of both the first tab 142a and the second tab 142b being provided with clearance notches 16, only for the purpose of discussion and not as a limitation.

[0048] In one embodiment, the first clearance notch 161 is connected to the outer edge of the first tab 142a away from the first body 141a. In this way, the first tab 142a only needs to have a small first clearance notch 161 to avoid the bending fixture. On the one hand, it can prevent the first clearance notch 161 from being too large and causing adverse effects on the current carrying capacity of the first tab 142a. On the other hand, to ensure the current-carrying capacity of the first tab 142a, the first clearance notch 161 cannot be too large. Therefore, in this embodiment, the first clearance notch 161 is connected to the outer edge of the first tab 142a, which can reduce the equipment and operation requirements of the bending fixture and facilitate the bending fixture to perform bending operations reliably and stably. If the first clearance notch 161 is not connected to the outer edge of the first tab 142a but is opened near the middle of the first tab 142a, the part of the bending fixture used to bend the tab 142a needs to be designed to be smaller in size to ensure that it can pass through the first clearance notch 161. This undoubtedly increases the equipment and operation requirements of the bending fixture, and it is more difficult for the bending fixture to pass through the smaller first clearance notch 161, which will also affect the reliability and stability of the bending fixture in performing bending operations.

[0049] Similarly, the second clearance notch 162 connects to the outer edge of the second tab 142b away from the second body 141b. In this way, the second tab 142b only needs to have a small second clearance notch 162 to avoid the bending fixture. On the one hand, this can prevent the second clearance notch 162 from being too large and adversely affecting the current carrying capacity of the second tab 142b. On the other hand, in order to ensure the current carrying capacity of the second tab 142b, the second clearance notch 162 cannot be too large. Therefore, in this embodiment, the second clearance notch 162 connects to the outer edge of the second tab 142b, which can reduce the equipment requirements and operation requirements of the bending fixture, and facilitate the bending fixture to perform bending operations reliably and stably.

[0050] In one embodiment, after the first tab 142a of the first battery cell 14a and the second tab 142b of the second battery cell 14b are brought together, and before a portion of the first tab 142a and a portion of the second tab 142b are bent, the distance between the first tab 142a and the second tab 142b in the third direction Y is D mm, satisfying: 1≤D≤5.

[0051] Please refer to the following: Figure 8 , Figure 8 This is a schematic diagram of the structure of one embodiment of the electrode of this application.

[0052] In one embodiment, the shape of the clearance notch 16 can be semi-circular, triangular, rectangular, etc., and the sharp corners of the clearance notch 16 are rounded. The radius of the rounded corners of the clearance notch 16 is R mm, satisfying: 0.5≤R≤2.

[0053] In one embodiment, the tab 142 has a dimension of H1 mm in the first direction Z, satisfying: 5 ≤ H1 ≤ 30. The tab 142 has a dimension of W1 mm ​​in the second direction X, satisfying: 20 ≤ W1 ≤ 100.

[0054] The clearance notch 16 has a dimension of H2 mm in the first direction Z, satisfying: 0.05H1≤H2≤0.3H1. The clearance notch 16 has a dimension of W2 mm in the second direction X, satisfying: 0.05W1≤W2≤0.2W1. The distance from the center of the clearance notch 16 to the left edge of the tab 142 is W3 mm, satisfying: 0.2W1≤W3≤0.8W1. The distance from the center of the clearance notch 16 to the right edge of the tab 142 is W4 mm, satisfying: 0.2W1≤W4≤0.8W1. The first clearance notch 161 on the first tab 142a and the second clearance notch 162 on the second tab 142b are misaligned in the second direction X. The distance between the center of the first clearance notch 161 and the center of the second clearance notch 162 in the second direction X is W5 mm, satisfying: 0.1W1≤W5≤0.6W1.

[0055] It should be noted that both the first electrode tab 142a and the second electrode tab 142b have the features described above regarding electrode tab 142. The first clearance notch 161 of the first electrode tab 142a and the second clearance notch 162 of the second electrode tab 142b both have the features described above regarding clearance notch 16.

[0056] In one embodiment, the connecting piece 15 is located on the side of the first body 141a and the second body 141b facing the top cover plate 121. A clearance hole 151 is provided through the connecting piece 15 along a first direction Z, meaning the clearance hole 151 is provided through the connecting piece 15 along the first direction Z. The first electrode tab 142a and the second electrode tab 142b both pass through the clearance hole 151. The first electrode tab 142a and the second electrode tab 142b are electrically connected to the side of the connecting piece 15 facing the top cover plate 121, so that the first electrode tab 142a and the second electrode tab 142b are electrically connected to the electrode post 122 through the connecting piece 15. The operating port 123 communicates with the clearance hole 151.

[0057] Specifically, the first electrode tab 142a includes a first connecting portion 1421a and a first bending portion 1422a. The first connecting portion 1421a is connected to the first body 141a, and the first bending portion 1422a is connected to the side of the first connecting portion 1421a away from the first body 141a. The second electrode tab 142b includes a second connecting portion 1421b and a second bending portion 1422b. The second connecting portion 1421b is connected to the second body 141b, and the second bending portion 1422b is connected to the side of the second connecting portion 1421b away from the second body 141b.

[0058] The first connecting portion 1421a and the second connecting portion 1421b both pass through the clearance hole 151. The first bent portion 1422a and the second bent portion 1422b are both located on the side of the connecting piece 15 facing the top cover piece 121 and are electrically connected to the connecting piece 15. The first tab 142a and the second tab 142b are arranged opposite to each other in the third direction Y. At least a portion of the first bent portion 1422a is away from the second tab 142b relative to the first connecting portion 1421a, and the first bent portion 1422a and the portion of the connecting piece 15 away from the first body 141a are electrically connected. At least a portion of the second bent portion 1422b is away from the first tab 142a relative to the second connecting portion 1421b, and the second bent portion 1422b and the portion of the connecting piece 15 away from the first body 141b are electrically connected.

[0059] The first tab 142a of the first battery cell 14a and the second tab 142b of the second battery cell 14b converge at the midpoint of their respective positions in the third direction Y. Correspondingly, the clearance hole 151 is located at the midpoint of the connecting piece 15 in the third direction Y, so that the first connecting portion 1421a of the first tab 142a and the second connecting portion 1421b of the second tab 142b can pass through the clearance hole 151. The aforementioned first clearance notch 161 is provided in the first bent portion 1422a of the first tab 142a, and the second clearance notch 162 is provided in the second bent portion 1422b of the second tab 142b. The bending fixture specifically bends the first bent portion 1422a and the second bent portion 1422b, so that the first bent portion 1422a and the second bent portion 1422b are bent to the side of the connecting piece 15 facing the top cover piece 121 and electrically connected to the connecting piece 15.

[0060] Because the first tab 142a and the second tab 142b are located at the midpoint of the first battery cell 14a and the second battery cell 14b in the third direction Y, the distance between the first tab 142a and the second tab 142b is smaller, making it extremely difficult to bend the first tab 142a and the second tab 142b using conventional tab bending processes. Therefore, this embodiment provides a more efficient tab 142 bending process that allows for easy bending of the first tab 142a and the second tab 142b even with a smaller distance between them. Furthermore, since both the first tab 142a and the second tab 142b in this embodiment are provided with clearance notches 16 (i.e., the first clearance notch 161 and the second clearance notch 162), the bending fixture that allows bending of the first tab 142a and the second tab 142b can perform bending operations simultaneously, which can shorten the time consumed by the bending process and improve the production efficiency of the single cell 10.

[0061] The production process of the single cell 10 of the present application is described below.

[0062] The first battery cell 14a and the second battery cell 14b are combined, and then the first battery cell 14a and the second battery cell 14b are installed into the housing 11; the terminal post 122 and the connecting piece 15 are electrically connected, and then the top cover 121 is closed onto the housing 11 to seal the receiving cavity 13 of the housing 11; during the process of the top cover 121 being closed onto the housing 11, the first electrode tab 142a and the second electrode tab 142b pass through the clearance hole 151 on the connecting piece 15 along the first direction Z, and at least a portion of the connecting piece 15, the first electrode tab 142a, and the second electrode tab 142b are exposed through the operating port 123 on the top cover 121; bending The fixture bends the first bent portion 1422a of the first electrode 142a and the second bent portion 1422b of the second electrode 142b through the first clearance notch 161 on the first electrode 142a and the second clearance notch 162 on the second electrode 142b, so that the first bent portion 1422a and the second bent portion 1422b are bent to the side of the connecting piece 15 facing the top cover piece 121 and electrically connected to the connecting piece 15. After the first electrode 142a and the second electrode 142b are electrically connected to the connecting piece 15, the top cover sealing assembly 17 is placed on the top cover piece 121 to close the operation port 123. Compared with the prior art in which the electrode 142 and the connecting piece 15 are ultrasonically welded, in this embodiment of the application, the first electrode 142a and the second electrode 142b and the connecting piece 15 can be laser welded. Laser welding has a higher effective melting area coefficient and avoids the risk of burrs generated by ultrasonic welding.

[0063] 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 direction, a second direction, and a third direction, wherein the first direction, the second direction, and the third direction intersect each other, and the single cell includes: A housing, wherein a receiving cavity is provided within the housing; A top cover assembly includes a top cover plate, a pole, and a connecting piece. The top cover plate covers one end of the housing in the first direction and seals the receiving cavity. The top cover plate has a pole hole and an operating port extending through it along the first direction. The pole is disposed in the pole hole and is electrically connected to the connecting piece. The operating port is spaced apart from the pole along the second direction and communicates with the receiving cavity. The battery cell is disposed in the accommodating cavity; The battery cell includes a first battery cell and a second battery cell disposed opposite to each other. The first battery cell includes a first body and a first electrode connected to the first body. The second battery cell includes a second body and a second electrode connected to the second body. The first electrode and the second electrode are distributed along the third direction. The connecting piece, the first electrode, and the second electrode along the first direction on the top cover plate expose the operation port. At least one of the first electrode and the second electrode is provided with a clearance notch. The projection of the opening wall of the clearance notch in the third direction is located on the other of the first electrode and the second electrode.

2. The single-cell battery according to claim 1, characterized in that, The clearance notch includes a first clearance notch and a second clearance notch. The first electrode tab is provided with the first clearance notch, and the second electrode tab is provided with the second clearance notch. The first clearance notch and the second clearance notch are staggered along the second direction. The first electrode tab and the second electrode tab are electrically connected to the side of the connecting piece facing the top cover piece.

3. The single-cell battery according to claim 2, characterized in that, The first clearance notch connects to the outer edge of the first electrode tab away from the first body, and the second clearance notch connects to the outer edge of the second electrode tab away from the second body.

4. The single-cell battery according to claim 1, characterized in that, The connecting piece is located on the side of the first body and the second body facing the top cover piece. A clearance hole is provided through the connecting piece along the first direction, and the first electrode tab and the second electrode tab are both inserted through the clearance hole.

5. The single-cell battery according to claim 4, characterized in that, The clearance hole is located in the middle of the connecting piece in the third direction.

6. The single-cell battery according to claim 4, characterized in that, The first electrode tab includes a first connecting portion and a first bending portion. The first connecting portion is connected to the first body, and the first bending portion is connected to the side of the first connecting portion away from the first body. The second electrode tab includes a second connecting portion and a second bending portion. The second connecting portion is connected to the second body, and the second bending portion is connected to the side of the second connecting portion away from the second body. Both the first connecting portion and the second connecting portion pass through the clearance hole, and both the first bending portion and the second bending portion are located on the side of the connecting piece facing the top cover piece and are electrically connected to the connecting piece.

7. The single-cell battery according to claim 6, characterized in that, At least a portion of the first bend is away from the second tab relative to the first connecting portion, and the first bend and the portion of the connecting piece away from the first body are electrically connected; at least a portion of the second bend is away from the first tab relative to the second connecting portion, and the second bend and the portion of the connecting piece away from the second body are electrically connected.

8. The single-cell battery according to claim 4, characterized in that, The operating port is connected to the clearance hole.

9. The single-cell battery according to claim 1, characterized in that, The single battery cell also includes: A top cover sealing assembly is provided on the top cover sheet to close the operating port.

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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