Battery cells, batteries and electrical devices

Abstract

This application relates to a battery cell, a battery, and an electrical device. The battery cell includes a casing, a cell, and terminals. The cell is housed within the casing and has two tab bundles of different polarities. Multiple cells are arranged sequentially along a first direction. The tab bundles of the same polarity from the multiple cells are located on the same side of the casing and arranged sequentially along the first direction. Terminals are disposed on the casing, and the number of terminals is the same as the number of tab bundles from the multiple cells. Each terminal corresponds to one tab bundle, and each terminal has a insertion slot directly opposite the corresponding tab bundle. The tab bundle is inserted into the insertion slot of the corresponding terminal and connected to the terminal. This battery cell can improve tab redundancy.

Description

Technical Field

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

[0002] A typical lithium-ion battery cell includes a casing, multiple cells (at least two) housed within the casing and arranged side-by-side, and positive and negative terminals mounted on the casing. Each cell has a positive tab bundle (including multiple positive tabs) and a negative tab bundle (including multiple negative tabs). The positive tab bundles of multiple cells are connected to the same positive terminal via an adapter, and the negative tab bundles of multiple cells are connected to the same negative terminal via an adapter. Related technologies have emerged that eliminate the adapter and directly connect the tabs and terminals. However, to directly connect the positive (and negative) tab bundles of multiple cells to the same positive (and negative) terminal, the length of the tabs in the positive (and negative) tab bundles usually needs to be increased. However, lengthening the tabs increases tab redundancy, thereby increasing the risk of tabs being inserted backwards into the cell and tab tearing, affecting battery performance and safety. Utility Model Content

[0003] Therefore, it is necessary to provide a battery cell that can improve tab redundancy.

[0004] This application provides a single battery cell, comprising:

[0005] shell;

[0006] A battery cell, housed within the housing, each battery cell having two tab bundles of different polarities, comprising multiple battery cells arranged sequentially along a first direction, with the tab bundles of the same polarity located on the same side of the housing and arranged sequentially along the first direction; and

[0007] A terminal post is disposed on the outer casing. The number of terminal posts is the same as the number of tab bundles of the plurality of battery cells. Each terminal post is correspondingly disposed with one tab bundle. The terminal post has a plug slot that is directly opposite to the corresponding tab bundle. The tab bundle is plugged into the plug slot of the corresponding terminal post and connected to the terminal post.

[0008] In one embodiment, in the first direction, the tab bundle is located in the middle of the cell.

[0009] In one embodiment, the battery cell further includes an inner connecting piece located within the housing, the inner connecting piece extending along the first direction, the terminals of the same polarity being spaced apart on one side of the inner connecting piece, and the insertion slot penetrating through the other side of the inner connecting piece.

[0010] In one embodiment, the battery cell further includes a limiting portion located inside the housing and an external connecting piece located outside the housing. Each limiting portion has a terminal post on one side, and the insertion groove extends through the other side of the limiting portion. The limiting portions of the same polarity are arranged at intervals in the first direction, and the terminals of the same polarity are connected by the external connecting piece in the first direction.

[0011] In one embodiment, the outer casing has a through hole for the electrode post, and the electrode post passes through the through hole for the electrode post;

[0012] The battery cell also includes a sealing ring and a fixing member. The sealing ring is inserted into the through hole of the terminal post and is located between the terminal post and the inner wall of the through hole. The sealing ring extends outward from the outer shell and overlaps the outer surface of the outer shell. The fixing member is located outside the shell and is sleeved on the terminal post. The fixing member connects the terminal post and the outer shell and together with the outer shell, presses the sealing ring.

[0013] In one embodiment, the fastener includes a first fixing part and a second fixing part connected together. The first fixing part is sleeved on the pole post and welded to the pole post. The second fixing part overlaps the outer casing and is welded to the outer casing; and / or

[0014] The housing includes a shell and a cover plate. The shell has a receiving cavity and an opening communicating with the receiving cavity. The battery cell is located inside the receiving cavity. The cover plate is disposed on the shell and covers the opening. The electrode through hole is disposed on the cover plate.

[0015] In one embodiment, the pole post is welded to the tab bundle to form a welded portion, which, in the first direction, penetrates the sidewall of one side of the insertion slot and the tab bundle, and extends to the sidewall of the other side of the insertion slot; and / or

[0016] In the first direction, the thickness of the tab bundle is W1, the thickness of the sidewall of the insertion slot is W2, W2 = (1.2-1.5)W1 or 0.3mm≤W2≤1.5mm, and the opening width of the insertion slot is W3, W3-W1 = 0-0.8mm.

[0017] In one embodiment, the portion of the pole exposed outside the housing is a closed structure; or

[0018] The portion of the terminal post exposed outside the housing has a groove, the groove being located at the end of the terminal post away from the tab bundle, one end of the insertion slot penetrating the bottom of the groove, the tab bundle passing through the insertion slot and overlapping the bottom of the groove, and the battery cell also includes a sealing cap, the sealing cap being disposed at the opening of the groove.

[0019] This application also provides a battery, including the aforementioned battery cell.

[0020] This application also provides an electrical device, including the aforementioned battery cell or the aforementioned battery.

[0021] The aforementioned battery cell eliminates the adapter plate, directly connecting the tab bundle and the terminal post. This eliminates the need for components, saving an assembly step and simplifying assembly. Furthermore, by increasing the number of terminals to twice the number of cells, and ensuring each tab bundle (positive or negative) connects to one terminal post, compared to using only two terminals (positive and negative), the positive tab bundles of multiple cells are directly connected to the same positive terminal post, and the negative tab bundles to the same negative terminal post. This allows for a relatively small distance between all tab bundles and their corresponding terminals, reducing the length requirements of the tabs and effectively minimizing tab redundancy. This reduces the risk of tabs being inserted incorrectly into the cell and the risk of tab tearing, resulting in better electrical and safety performance of the battery cell. Additionally, each terminal generates less heat, dissipates heat faster, and has a smaller thermal impact on the lower insulation components. Furthermore, the tab bundle is inserted into the terminal post through the insertion slot, which further reduces redundancy on the inner and outer sides of the tab bundle, avoids the tabs stacking between the casing and the cell end face, and makes full use of the internal space of the terminal post. This improves the utilization rate of the internal height (Z direction) space of the battery cell and further shortens the current path between the tab and the terminal post. Moreover, because the insertion slots of the tab bundle and the corresponding terminal post are aligned, the tab bundle can be inserted into the insertion slot without bending, ensuring consistent redundancy on the inner and outer sides of the tab bundle, and that both the inner and outer parts of the tab can be well housed in the terminal post. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application;

[0024] Figure 2 for Figure 1 A top view of the battery cell shown;

[0025] Figure 3 For along Figure 2 A cross-sectional view of line AA in the diagram;

[0026] Figure 4 for Figure 3 A magnified view of point B in the image;

[0027] Figure 5 for Figure 1 The exploded view of the battery cell shown;

[0028] Figure 6 for Figure 5 A magnified view of a portion of the image;

[0029] Figure 7 This is a partial exploded view of a battery cell according to another embodiment of this application;

[0030] Figure 8 This is a schematic diagram of the structure of a battery cell according to another embodiment of this application;

[0031] Figure 9 This is a top view of a battery cell according to another embodiment of this application;

[0032] Figure 10 For along Figure 9 A cross-sectional view of the CC line in the diagram;

[0033] Figure 11 for Figure 10 A magnified view of point D in the image.

[0034] The reference numerals in the detailed embodiments are as follows:

[0035] 10. Battery cells;

[0036] 200. Outer casing; 202. Installation space; 210. Housing; 220. Cover plate; 222. Through hole for pole post;

[0037] 300, Battery cell; 310, Electrode bundle; 310a, Positive electrode bundle; 310b, Negative electrode bundle;

[0038] 400, terminal post; 400a, positive terminal post; 400b, negative terminal post; 402, connector slot; 404, groove;

[0039] 500, sealing ring;

[0040] 600. Fastener; 610. First fastening part; 620. Second fastening part;

[0041] 700. Lower insulation component;

[0042] 800c, inner connecting piece; 800b, limiting part; 800c, outer connecting piece;

[0043] 900, Sealing Cap Detailed Implementation

[0044] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0045] In the description of this application, it should be understood that, where they appear, the terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0046] Furthermore, where applicable, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., shall be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral part; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; they may refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0049] It should be noted that, if an element is described as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is described as "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0050] like Figures 1-5 As shown, a battery cell 10 is provided in one embodiment of this application. The battery cell 10 includes a casing 200, a cell 300, and terminals 400.

[0051] The battery cell 300 is housed within the casing 200. The battery cell 300 has two tab bundles 310 with different polarities, namely a positive tab bundle 310a and a negative tab bundle 310b. The positive tab bundle 310a includes multiple positive tabs. The negative tab bundle 310b includes multiple negative tabs.

[0052] There are multiple (two or more) battery cells 300. Specifically, in this embodiment, there are two battery cells 300. The multiple battery cells 300 are arranged sequentially along the first direction X. The electrode bundles 310 of the multiple battery cells 300 with the same polarity are located on the same side of the outer casing 200 and arranged sequentially along the first direction X. That is, the positive electrode bundles 310a of the multiple battery cells 300 are located on the same side (positive electrode side) of the outer casing 200 and arranged sequentially along the first direction X, and the negative electrode bundles 310b of the multiple battery cells 300 are located on the same side (negative electrode side) of the outer casing 200 and arranged sequentially along the first direction X. The positive electrode side and the negative electrode side can be the same side of the outer casing 200 or different sides of the outer casing 200.

[0053] Specifically, in this embodiment, the positive electrode side and the negative electrode side are the same side of the outer casing 200, both being the upper side of the outer casing 200. This is because the positive electrode bundle 310a and the negative electrode bundle 310b of the battery cell 300 are both located on the upper side of the outer casing 200 and distributed at both ends of the upper side of the outer casing 200. It can be understood that in other embodiments, when the positive electrode bundle 310a of the battery cell 300 is located on the upper side of the outer casing 200, and the negative electrode bundle 310b of the battery cell 300 is located on the lower side of the outer casing 200, the positive electrode side and the negative electrode side are the upper and lower sides of the outer casing 200, respectively, and the positive electrode side and the negative electrode side are different sides of the outer casing 200.

[0054] A terminal 400 is disposed on the housing 200. The number of terminal 400s is the same as the number of tab bundles 310 of the multiple battery cells 300, that is, the number of terminal 400s is twice the number of battery cells 300. Each terminal 400 is correspondingly disposed to one tab bundle 310. That is, one terminal 400 is correspondingly disposed to one positive tab bundle 310a or one negative tab bundle 310b, wherein the terminal 400 corresponding to the positive tab bundle 310a is the positive terminal 400a, and the terminal 400 corresponding to the negative tab bundle 310b is the negative terminal 400b.

[0055] The pole post 400 has a insertion slot 402 that is directly opposite to the corresponding tab bundle 310. The tab bundle 310 is inserted into the insertion slot 402 of the corresponding pole post 400 and connected to the pole post 400.

[0056] The aforementioned battery cell 10 eliminates the adapter plate, directly connecting the tab bundle 310 and the terminal 400, thus omitting a component and saving an assembly step, making assembly easier. Simultaneously, by increasing the number of terminals 400 to twice the number of cells 300, and ensuring that each tab bundle 310 (positive tab bundle 310a or negative tab bundle 310b) is connected to one terminal 400, compared to having only two terminals (positive and negative), multiple cells can have their positive tab bundles 310 directly connected to the same positive terminal, and their negative tab bundles 310b directly connected to the same negative terminal. This allows all tab bundles 310 to be connected to the same positive terminal, and all battery cells can have their positive tab bundles 310a directly connected to the same negative terminal. The distance between the positive tab bundle 310a or the negative tab bundle 310b and its corresponding terminal post 400 is relatively small, which reduces the length requirement of the tabs in the tab bundle 310 and effectively reduces tab redundancy. This reduces the risk of tabs being inserted into the cell 300 in reverse and the tabs tearing, resulting in better electrical and safety performance of the battery cell 10. Furthermore, each terminal post 400 generates less heat, dissipates heat faster, and has a smaller thermal impact on the lower insulation component 700. In addition, the tab bundle 310 is inserted into the terminal post 400 through the insertion slot 402, further reducing redundancy on the inner and outer sides of the tab bundle 310 and preventing the tabs from stacking between the outer casing 200 and the end face of the cell 300. This fully utilizes the internal space of the terminal post 400, improving the internal height (Z-direction) space utilization of the battery cell 10 and further shortening the current path between the tabs and the terminal post 400. Furthermore, since the tab bundle 310 is positioned directly opposite the corresponding insertion slot 402 of the pole post 400, the tab bundle 310 can be inserted into the insertion slot 402 without bending, ensuring the redundancy consistency of the inner and outer sides of the tab bundle 310, and that the inner and outer parts of the tab can be well housed in the pole post 400.

[0057] In this embodiment, the battery cell 300 is a wound battery cell, and each turn of the positive electrode has two positive tabs, while each turn of the negative electrode has two negative tabs. That is, the wound battery cell in this embodiment has two tabs per turn of electrode. Compared to a battery cell with one tab per turn of electrode, it has lower DC internal resistance, significantly enhanced overcurrent capacity, and lower temperature rise. However, due to the increased number of tabs, the total thickness of the tab bundle 310 increases, making tab redundancy more likely. Therefore, the above-mentioned scheme of connecting each tab bundle 310 (positive tab bundle 310a or negative tab bundle 310b) to a terminal post 400 is very suitable for batteries with two tabs per turn of electrode. It can be understood that in other embodiments, the battery cell 300 can also be a battery cell with one tab per turn of electrode, or it can be a laminated battery cell.

[0058] In this embodiment, the tab bundle 310 is located in the middle of the cell 300 in the first direction X. The tab bundle 310 is inserted into the terminal post 400 from the middle of the cell 300, ensuring redundancy consistency on both the inner and outer sides of the tab bundle 310, and that both the inner and outer portions of the tab are well housed within the terminal post 400. It is understood that in other embodiments, the tab bundle 310 may be offset from the middle of the cell 300.

[0059] In this embodiment, in the insertion direction (third direction Z) of the tab bundle 310, the depth of the insertion groove 402 (depth in the third direction Z) is greater than or equal to the length of the tab bundle 310 (length in the third direction Z). This prevents the end of the tab bundle 310 from bending after touching the bottom of the insertion groove 402.

[0060] In this embodiment, the outer casing 200 has a terminal through-hole 222. The terminal 400 passes through the terminal through-hole 222. The battery cell 10 also includes a sealing ring 500 and a fixing member 600. The sealing ring 500 is inserted into the terminal through-hole 222 and is located between the terminal 400 and the inner wall of the terminal through-hole 222. The sealing ring 500 extends outward from the outer casing and overlaps the outer surface of the outer casing 200. The fixing member 600 is located outside the casing 200 and is sleeved on the terminal 400. The fixing member 600 connects the terminal 400 and the outer casing 200, and together with the outer casing 200, they press the sealing ring 500. In this way, not only is it convenient to achieve an insulating and sealing connection between the terminal 400 and the outer casing 200, but also, by using the fixing member 600 instead of the upper insulating member, assembly can be carried out by welding, eliminating the need to injection mold an upper insulating member onto the outer casing 200, thus facilitating assembly.

[0061] In this embodiment, the fastener 600 is a ceramic brazing sheet. This makes welding very convenient.

[0062] In this embodiment, the fixing member 600 includes a first fixing part 610 and a second fixing part 620 connected together. The first fixing part 610 is sleeved on the pole post 400. The first fixing part 610 is welded to the pole post 400. The second fixing part 620 overlaps with the outer shell 200. The second fixing part 620 is welded to the outer shell 200. In this way, the welding area of ​​the pole post 400 and the welding area of ​​the outer shell 200 can be separated, avoiding welding interference.

[0063] In this embodiment, the first fixing portion 610 and the second fixing portion 620 of the fastener 600 are arranged in the first direction X. Specifically, in this embodiment, the width of the second fixing portion 620 in the second direction Y is smaller than the width of the first fixing portion 610 in the second direction Y. The plane defined by the second direction Y and the first direction X is parallel to the fastener 600. In this way, a relatively small amount of material can be used for the fastener 600, reducing material costs. Specifically, in this embodiment, the number of battery cells 300 is even. In the first direction X, every two fasteners 600 form a group, and in each group of fasteners 600, the second fixing portion 620 of the fastener 600 is arranged facing each other. In this way, the area of ​​the housing 200 between two adjacent groups of fasteners 600 without fasteners 600 can be used for wiring.

[0064] In this embodiment, each pole post 400 is equipped with a fixing member 600, that is, in the first direction X, multiple fixing members 600 are independent of each other. It can be understood that in other embodiments, multiple pole posts 400 of the same polarity can also be equipped with a fixing member 600, that is, in the first direction X, multiple fixing members 600 are connected and form a whole.

[0065] In this embodiment, the outer casing 200 includes a housing 210 and a cover plate 220. The housing 210 has a receiving cavity and an opening communicating with the receiving cavity. The battery cell 300 is located inside the receiving cavity. The cover plate 220 is disposed on the housing 210 and covers the opening. A terminal through hole 222 is disposed on the cover plate 220. The terminal 400 passes through the terminal through hole 222.

[0066] In this embodiment, the battery cell 10 further includes a lower insulating member 700. The lower insulating member 700 is disposed on the inner side of the cover plate 220 and has a clearance hole communicating with the terminal through hole 222. The terminal 400 passes through the clearance hole and the terminal through hole 222.

[0067] When assembling the battery cell 10, the following steps can be taken: (1) Insert the tab bundle 310 into the insertion slot 402 of the terminal post 400, weld the tab bundle 310 and the terminal post 400, then set the lower insulating member 700 on the cover plate 220, and pass the terminal post 400 through the clearance hole of the lower insulating member 700 and the terminal post through hole 222 of the cover plate 220; (2) Place the sealing ring 500 and the ceramic brazing sheet 600 on the terminal post 400 in sequence, press down the ceramic brazing sheet 600 to compress the sealing ring 500, so that the sealing ring 500 reaches the preset compression amount; (3) Weld the terminal post 400 and the cover plate 220 to the ceramic brazing sheet 600 respectively, so as to fix the terminal post 400 on the cover plate 220 and keep the sealing ring 500 in a compressed state. In this way, the cell 300 and the cover plate 220 are connected, and the cell 300 is then inserted into the shell and the cover plate 220 and the shell 210 are welded.

[0068] In this embodiment, the pole post 400 and the tab bundle 310 are welded together to form a fixing part. In the first direction X, the fixing part penetrates one side wall of the insertion slot 402 and the tab bundle 310, and extends to the other side wall of the insertion slot 402. This not only facilitates the connection between the pole post 400 and the tab bundle 310, but also ensures a secure connection. Specifically, in this embodiment, the pole post 400 and the tab bundle 310 are welded using resistance welding or laser welding. It is understood that in other embodiments, the pole post 400 and the tab bundle 310 can be fixed and electrically connected using conductive adhesive. Specifically, in this embodiment, before welding the pole post 400 and the tab bundle 310, the tab bundle 310 is pre-welded to ensure that the tab bundle 310 can be smoothly inserted into the insertion slot 402 of the pole post 400.

[0069] In the first direction X, the thickness of the tab bundle 310 is W1, the thickness of the sidewall of the insertion slot 402 is W2, and the opening width of the insertion slot 402 is W3. If W2 is too thick, it is easy to have incomplete welding; if it is too thin, it is easy to have welding defects or bursts. Considering the above factors, W2 is set to (1.2-1.5)W1 or 0.3mm≤W2≤1.5mm. If W3 is too wide, there will be a gap between the tab bundle 310 and the sidewall of the insertion slot 402, which is easy to have welding defects or bursts. If W3 is too small, the tab bundle 310 will not be easy to insert. Considering the above factors, W3-W1 = 0-0.8mm.

[0070] In this embodiment, as Figure 5 and Figure 6As shown, outside the housing 200, terminals 400 of the same polarity are arranged sequentially at intervals along the first direction X. This completes the setup of multiple terminals 400. Inside the housing 200, terminals 400 of the same polarity are connected sequentially along the first direction X. This allows terminals 400 of the same polarity to be connected inside the housing 200, forming a battery cell 10. This facilitates monitoring of the battery cell 10's status by the busbar terminals (monitoring data for the entire battery cell 10, not just individual cells 300). Furthermore, connecting the terminals 400 inside the housing 200 simplifies assembly steps, prevents omissions, reduces overall dimensional errors, improves the overall assembly effect of the battery cell 10, and enhances the reliability of the connection between the terminals 400 and the housing 200. Specifically, in this embodiment, the battery cell 10 also includes an inner connecting piece 800a located inside the housing 200. The inner connecting piece 800a extends along the first direction X. Terminals 400 of the same polarity are spaced apart on one side of the inner connecting piece 800a. The insertion slot 402 extends through the other side of the inner connecting piece 800a. This not only facilitates the connection of the poles 400 of the same polarity inside the housing 200, but also makes it very convenient for the poles 400 to be assembled onto the housing 200. During assembly, the inner connecting piece 800a can limit the position of the poles 400 inserted into the housing 200, preventing the poles 400 from falling out of the assembly position during (or before) welding onto the housing 200.

[0071] In some embodiments, such as Figure 7 As shown, outside the housing 200, terminals 400 of the same polarity are arranged at intervals in the first direction X. This completes the configuration of multiple terminals 400. Inside the housing 200, terminals 400 of the same polarity are arranged at intervals in the first direction X. Thus, terminals 400 of the same polarity are independent of each other, and can be electrically connected later via a busbar.

[0072] exist Figure 7 In the illustrated embodiment, the battery cell 10 further includes a limiting portion 800b located within the housing 200. Each limiting portion 800b has a terminal post 400 on one side. An insertion slot 402 extends through the other side of the limiting portion 800b. Limiting portions 800b of the same polarity are spaced apart in the first direction X. This not only facilitates the sequential, spaced-apart arrangement of terminals 400 of the same polarity within the housing 200 in the first direction X, but also greatly facilitates the assembly of the terminals 400 onto the housing 200. During assembly, the limiting portion 800b can limit the position of the terminals 400 inserted into the housing 200, preventing the terminals 400 from dislodging from their assembly position during (or before) welding to the housing 200.

[0073] exist Figure 7In the illustrated embodiment, the battery cell 10 further includes a busbar. In the first direction X, terminals 400 of the same polarity are connected via the busbar. In some embodiments, the busbar has a recess. In the first direction X, each terminal 400 of the same polarity is inserted into a recess. Thus, the insertion of the terminal 400 into the busbar can be achieved without additional protrusions on the terminal 400, which is very convenient.

[0074] In some embodiments, for Figure 7 The illustrated embodiment was further improved to obtain Figure 8 The illustrated embodiment. Figure 8 In the illustrated embodiment, the battery cell 10 also includes an external connecting piece 800c located outside the housing 200. In the first direction X, terminals 400 of the same polarity are connected via the external connecting piece 800c. This allows terminals 400 of the same polarity to be connected outside the housing 200, forming the battery cell 10, facilitating monitoring of the battery cell 10's status by the busbar terminals (monitoring data for the entire battery cell 10, not just individual cells 300). Furthermore, when setting the busbar, it can be directly mounted on the external connecting piece 800c, which provides a larger welding area for the busbar. Specifically, in... Figure 8 In the illustrated embodiment, the battery cell 10 further includes a busbar. The busbar is soldered to the external connector 800c.

[0075] exist Figure 8 In the illustrated embodiment, the battery cell 10 further includes a cooling structure. An external connecting piece 800c is located at the end of the terminal 400 furthest from the cell 300 and defines a mounting space 202 between the external connecting piece 800c and the housing 200. The cooling structure is disposed within the mounting space. The cooling structure can cool the busbar and the terminal 400. In related technologies, battery cooling structures are typically mounted on the bottom or top plate of the module, with a large distance from the busbar / terminal, resulting in relatively low heat dissipation efficiency. However, the cooling structure in this embodiment is closer to the busbar / terminal, with a shorter heat dissipation path, resulting in higher heat dissipation efficiency.

[0076] In this embodiment, as Figures 1-5 As shown, the portion of the electrode post 400 exposed outside the housing 200 is a closed structure. Thus, the exposed portion of the electrode post 400 has good sealing performance, eliminating the need for additional sealing procedures.

[0077] In some embodiments, such as Figures 9-11As shown, the portion of the terminal post 400 exposed outside the housing 200 has a groove 404. The groove 404 is located at the end of the terminal post 400 away from the tab bundle 310. One end of the insertion slot 402 extends through the bottom of the groove 404. The tab bundle 310 passes through the insertion slot 402, bends, and overlaps the bottom of the groove 404. The battery cell 10 also includes a sealing cap 900. The sealing cap 900 covers the opening of the groove 404. In this way, the height of the terminal post 400 can be reduced.

[0078] This application also provides a battery comprising the aforementioned battery cell.

[0079] This application also provides an electrical device comprising the aforementioned battery or individual battery cells. The aforementioned electrical device can be a vehicle, mobile phone, portable device, laptop, ship, spacecraft, electric toy, power tool, energy storage device, amusement equipment, elevator, and lifting equipment, etc. Vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or electric airplane toys, etc.; 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.; energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be a carousel, a drop tower, etc. This embodiment does not impose any special limitations on the aforementioned electrical device.

[0080] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cell (10), characterized in that, include: Outer shell (200); A battery cell (300) is housed within the outer casing (200). Each battery cell (300) has two tab bundles (310) of different polarities. Multiple battery cells (300) are arranged sequentially along a first direction. The tab bundles (310) of the same polarity of the multiple battery cells (300) are located on the same side of the outer casing (200) and arranged sequentially along the first direction. A terminal post (400) is disposed on the housing (200). The number of terminal posts (400) is the same as the number of tab bundles (310) of the plurality of battery cells (300). Each terminal post (400) is correspondingly disposed with one tab bundle (310). The terminal post (400) has a plug slot (402) that is directly opposite to the corresponding tab bundle (310). The tab bundle (310) is inserted into the plug slot (402) of the corresponding terminal post (400) and connected to the terminal post (400).

2. The battery cell (10) as described in claim 1, characterized in that: In the first direction, the tab bundle (310) is located in the middle of the cell (300).

3. The battery cell (10) as described in claim 2, characterized in that: The battery cell (10) also includes an inner connecting piece (800a) located inside the housing (200), the inner connecting piece (800a) extending along the first direction, the poles (400) of the same polarity being spaced apart on one side of the inner connecting piece (800a), and the insertion groove (402) penetrating through the other side of the inner connecting piece (800a).

4. The battery cell (10) as described in claim 2, characterized in that: The battery cell (10) further includes a limiting part (800b) located inside the housing (200) and an outer connecting piece (800c) located outside the housing (200). Each limiting part (800b) has a terminal post (400) on one side, and the insertion groove (402) passes through the other side of the limiting part (800b). The limiting parts (800b) of the same polarity are arranged at intervals in the first direction. In the first direction, the terminal posts (400) of the same polarity are connected by the outer connecting piece (800c).

5. The battery cell (10) as described in claim 2, characterized in that: The outer casing (200) has a pole post through hole (222), and the pole post (400) passes through the pole post through hole (222); The battery cell (10) further includes a sealing ring (500) and a fixing member (600). The sealing ring (500) is inserted into the terminal through hole (222) and located between the terminal (400) and the inner wall of the terminal through hole (222). The sealing ring (500) extends outward from the outer shell (200) and overlaps the outer surface of the outer shell (200). The fixing member (600) is located outside the outer shell (200) and is sleeved on the terminal (400). The fixing member (600) connects the terminal (400) and the outer shell (200) and together with the outer shell (200) compresses the sealing ring (500).

6. The battery cell (10) as described in claim 5, characterized in that: The fastener (600) includes a first fixing part (610) and a second fixing part (620) connected together. The first fixing part (610) is sleeved on the pole post (400) and welded to the pole post (400). The second fixing part (620) overlaps the outer shell (200) and is welded to the outer shell (200); and / or The outer casing (200) includes a housing (210) and a cover plate (220). The housing (210) has a receiving cavity and an opening communicating with the receiving cavity. The battery cell (300) is located in the receiving cavity. The cover plate (220) is disposed on the housing (210) and covers the opening. The electrode through hole (222) is disposed on the cover plate (220).

7. The battery cell (10) according to any one of claims 1-6, characterized in that: The pole post (400) is welded to the tab bundle (310) to form a welded portion. In the first direction, the welded portion penetrates one side wall of the insertion groove (402) and the tab bundle (310), and extends to the other side wall of the insertion groove (402); and / or In the first direction, the thickness of the tab bundle (310) is W1, the thickness of the sidewall of the insertion groove (402) is W2, W2 = (1.2-1.5)W1 or 0.3mm≤W2≤1.5mm, and the opening width of the insertion groove (402) is W3, W3-W1 = 0-0.8mm.

8. The battery cell (10) according to any one of claims 1-6, characterized in that: The portion of the pole post (400) exposed outside the outer casing (200) is a closed structure; or The portion of the terminal post (400) exposed outside the outer casing (200) has a groove (404). The groove (404) is located at the end of the terminal post (400) away from the tab bundle (310). One end of the insertion groove (402) penetrates the bottom of the groove (404). The tab bundle (310) passes through the insertion groove (402) and overlaps the bottom of the groove (404). The battery cell (10) also includes a sealing cap (900), which covers the opening of the groove (404).

9. A battery, characterized in that, Includes the battery cell (10) as described in any one of claims 1-8.

10. An electrical device, characterized in that, Includes the battery cell (10) as described in any one of claims 1-8 or the battery as described in claim 9.

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