A single cell and a battery pack
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SUNWODA MOBILITY ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2026-04-27
- Publication Date
- 2026-07-21
AI Technical Summary
In the existing technology, the tabs are welded to the terminals via connecting pieces, which increases the internal resistance and reduces the battery's overcurrent capacity.
The electrode is directly connected to the conductive part through a second connecting part, eliminating the need for intermediate transition structures such as connecting pieces. The current flows directly between the electrode and the conductive part, reducing solder marks and simplifying the structure.
It reduces current transmission impedance, improves the overcurrent capability of individual cells, simplifies the structure, and reduces manufacturing costs and assembly complexity.
Smart Images
Figure CN122436629A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of battery technology, specifically relating to a single cell battery and a battery pack. Background Technology
[0002] In the existing technology, the tabs are usually welded to the connecting piece, and the connecting piece is then welded to the terminal post. This increases the internal resistance of the connecting piece and the terminal post, resulting in poor overcurrent capacity of the battery. Summary of the Invention
[0003] This application aims to provide a single-cell battery that can at least solve the problem of poor overcurrent capacity of single-cell batteries.
[0004] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application propose a single-cell battery having a first direction. The single-cell battery includes a casing, a top cover, a conductive element, and a cell. The casing has a receiving cavity with an opening at one end along the first direction. The top cover is connected to the casing and closes the opening. The top cover has a through-hole that communicates with the receiving cavity. The conductive element is connected to the side of the top cover facing away from the receiving cavity along the first direction. The cell includes a cell body and a first tab. The cell body is disposed within the receiving cavity. The first tab includes a first connecting portion and a second connecting portion. The first connecting portion is connected to the side of the cell body facing the opening along the first direction and passes through the first through-hole. The second connecting portion is connected to the side of the first connecting portion away from the cell body and is fixed between the conductive element and the top cover. The second connecting portion is electrically connected to the conductive element.
[0005] Secondly, embodiments of this application propose a battery pack including the single battery cells described in the first aspect embodiments above.
[0006] In the embodiments of this application, the beneficial effects are as follows: by connecting the conductive element to the side of the top cover facing away from the receiving cavity along the first direction, the top cover is provided with a first through hole communicating with the receiving cavity, the first connecting part is connected to the side of the cell body facing the opening along the first direction and passes through the first through hole of the top cover, the second connecting part is connected to the side of the first connecting part away from the cell body and is fixed between the conductive element and the top cover, and the second connecting part is electrically connected to the conductive element, the tab can be directly electrically connected to the conductive element through the second connecting part to conduct the cell body and the conductive element. Compared with the prior art of using the tab to connect the terminal post through the connecting piece, in the single cell provided by the embodiments of the present invention, the current can flow directly between the first tab and the conductive element without passing through the intermediate transfer structure such as the connecting piece, and the soldering can be reduced, thereby reducing the current transmission impedance, improving the overcurrent capacity of the single cell, and simplifying the structure of the single cell.
[0007] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0008] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the external structure of a single battery cell according to an embodiment of the present invention; Figure 2 This is a cross-sectional structural diagram of a single battery cell according to an embodiment of the present invention; Figure 3 This is a cross-sectional structural diagram of a single cell according to another embodiment of the present invention; Figure 4 This is a schematic diagram of a partial cross-sectional structure of a single cell according to another embodiment of the present invention; Figure 5 This is a schematic diagram of a partial cross-sectional structure of a single cell according to another embodiment of the present invention; Figure 6 This is a partially exploded structural diagram of a single cell according to an embodiment of the present invention.
[0009] Single cell 100; casing 110; receiving cavity 111; opening 1113; top cover 130; cover body 131; first through hole 1313; second through hole 1315; boss 133; groove 1331; slot 1333; inner peripheral wall 1335; first end face 1337; conductive component 150; outer peripheral wall 151; second end face 153; Battery cell 170; battery cell body 171; first tab 173; first connecting part 1731; first sub-part 1735; second sub-part 1737; second connecting part 1733; third sub-part 1739; fourth sub-part 1741; second tab 175; Terminal post 190; Insulator 210; First insulator 211; Third through hole 2113; Second insulator 213; Fourth through hole 2131; Electrical connector 230; First direction X; second direction Y; third direction Z. Detailed Implementation
[0010] Embodiments of the present invention will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.
[0011] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0012] In the description of this invention, it should be understood that 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 invention and simplifying the description, and are not intended to 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 invention.
[0013] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0014] The following is combined with Figures 1 to 6 A single-cell battery 100 and a battery pack according to an embodiment of the present invention are described.
[0015] like Figure 1As shown, according to some embodiments of the present invention, the battery pack includes individual battery cells 100, and the number of individual battery cells 100 can be one or more. When there are multiple individual battery cells 100, the multiple individual battery cells 100 can be connected in series, in parallel, or in a combination of series and parallel connections.
[0016] According to some embodiments of the present invention, the battery pack may further include a housing, and the individual battery cells 100 may be disposed in the housing and connected to the housing.
[0017] like Figures 1 to 2 As shown, according to some embodiments of the present invention, the single cell 100 has a first direction X, for example, the first direction X can be the height direction of the single cell 100.
[0018] The single battery 100 includes a casing 110, a top cover 130, a conductive component 150, and a battery cell 170. The battery cell 170 includes a battery cell body 171 and a first tab 173.
[0019] The housing 110 has a receiving cavity 111, and one end of the receiving cavity 111 along the first direction X has an opening 1113. The battery cell body 171 is disposed in the receiving cavity 111. The top cover 130 is connected to the housing 110 and closes the opening 1113, thereby encapsulating the battery cell body 171 in the receiving cavity 111. The top cover 130 and the housing 110 can be connected and fixed by welding, snap-fitting, bonding or other methods.
[0020] The conductive element 150 is connected to the side of the top cover 130 opposite to the receiving cavity 111 along the first direction X. That is, the conductive element 150 can be located outside the receiving cavity 111 and connected to the top cover 130. The conductive element 150 can be used to connect to an external circuit, for example, a bus or other circuit structure. The top cover 130 is provided with a through hole 1313, which communicates with the receiving cavity 111 and can penetrate the top cover 130 along the first direction X.
[0021] The first tab 173 includes a first connecting portion 1731 and a second connecting portion 1733. The first connecting portion 1731 is connected to the side of the cell body 171 facing the opening 1113 along the first direction X and passes through the first through hole 1313. The second connecting portion 1733 is connected to the side of the first connecting portion 1731 away from the cell body 171 and is fixed between the conductive member 150 and the top cover 130. The second connecting portion 1733 is electrically connected to the conductive member 150. In this way, the tab can be directly electrically connected to the conductive member 150 through the second connecting portion 1733 to conduct electricity between the cell body 171 and the conductive member 150. Compared with the prior art batteries that use tabs to connect to the terminals through connecting pieces, the single cell battery 10 provided in this embodiment of the invention... In this configuration, current can flow directly between the first tab 173 and the conductive element 150 without passing through intermediate transition structures such as connecting pieces, thus reducing the amount of soldering and reducing current transmission impedance. This improves the overcurrent capacity of the single cell 100 and simplifies its structure. Furthermore, since the first connecting part 1731 passes through the first through hole 1313, the first through hole 1313 can provide an accurate installation position for the first connecting part 1731 and can position the first connecting part 1731. This helps to reduce the possibility of the second connecting part 1733 detaching from the conductive element 150 due to impacts or vibrations to the single cell 100, allowing the second connecting part 1733 to be more stably electrically connected to the conductive element 150.
[0022] Furthermore, since the first connecting part 1731 is connected to the side of the cell body 171 facing the opening 1113 along the first direction X, that is, the first connecting part 1731 and the conductive member 150 are both located on the same side of the cell body 171 along the first direction X, the first connecting part 1731 can be inserted into the first through hole 1313 more conveniently, which helps to improve the situation where the first tab 173 needs to be bent and inserted into the slot.
[0023] The second connecting part 1733 and the conductive element 150 can be electrically connected in various ways.
[0024] According to some examples of the present invention, the second connection portion 1733 may contact the conductive element 150.
[0025] According to some other examples of the invention, the second connection portion 1733 may be welded to the conductive element 150.
[0026] According to some other examples of the present invention, the single cell 100 may further include conductive adhesive, which can bond the second connection portion 1733 and the conductive element 150.
[0027] The second connecting part 1733 and the conductive part 150 can also adopt other electrical connection methods; the above are only examples for the purpose of understanding.
[0028] According to an embodiment of the present invention, the single-cell battery 100 is constructed by connecting a conductive member 150 to the side of a top cover 130 facing away from the receiving cavity 111 along the first direction X. The top cover 130 has a first through hole 1313 communicating with the receiving cavity 111. A first connecting portion 1731 is connected to the side of the cell body 171 facing the opening 1113 along the first direction X and passes through the first through hole 1313 of the top cover 130. A second connecting portion 1733 is connected to the side of the first connecting portion 1731 away from the cell body 171 and is fixed between the conductive member 150 and the top cover 130. Electrically connected to the conductive element 150, the tab can be directly electrically connected to the conductive element 150 through the second connecting part 1733 to conduct electricity between the cell body 171 and the conductive element 150. Compared with the prior art where the tab is connected to the terminal post through a connecting piece, in the single cell 100 provided in this embodiment of the invention, the current can flow directly between the first tab 173 and the conductive element 150 without passing through intermediate transition structures such as connecting pieces, and the number of solder marks can be reduced, thereby reducing the current transmission impedance, improving the overcurrent capacity of the single cell 100, and simplifying the structure of the single cell 100.
[0029] According to some embodiments of the present invention, the single cell 100 may also have a second direction Y, which is perpendicular to the first direction X, and the second direction Y may be the thickness direction of the single cell 100.
[0030] According to some embodiments of the present invention, the single cell 100 further has a third direction Z, which is perpendicular to the first direction X, and the third direction Z can be perpendicular to the second direction Y. The third direction Z can be the width direction of the single cell 100.
[0031] According to some embodiments of the present invention, the top cover 130 may include a cover body 131 and a boss 133.
[0032] The cover 131 can be connected to the housing 110 and close the opening 1113. The cover 131 is provided with a first through hole 1313. The boss 133 and the cover 131 can be connected and fixed by integral molding, welding, snap-fitting, bonding or other methods.
[0033] The boss 133 is connected to the side of the cover 131 facing away from the receiving cavity 111 along the first direction X, that is, the boss 133 is located outside the receiving cavity 111. The boss 133 may be provided with a groove 1331, which may be located on the side of the first through hole 1313 facing away from the receiving cavity 111 along the first direction X, and communicate with the first through hole 1313. That is, the groove 1331 and the first through hole 1313 may be opposite to each other and communicate along the first direction X. The second connecting portion 1733 is located within the groove 1331. The groove 1331 has a slot 1333 on the side opposite to the first through hole 1313. The conductive element 150 is connected to the boss 133 and closes the slot 1333. Thus, the groove 1331 can accommodate the second connecting portion 1733 and the conductive element 150, which helps to make the overall structure of the single cell 100 more compact. The conductive element 150 can close the slot 1333, thereby encapsulating the second connecting portion 1733 within the groove 1331, which helps to better protect the second connecting portion 1733 and reduce the possibility of damage to the second connecting portion 1733 from external structures. The conductive part 150 and the boss 133 can be connected and fixed by welding, snap-fitting, bonding or other methods.
[0034] like Figure 3 As shown, according to some embodiments of the present invention, the groove 1331 may have an inner peripheral wall 1335, and the conductive element 150 may have an outer peripheral wall 151.
[0035] The conductive element 150 is at least partially disposed within the groove 1331, thereby reducing the possibility of damage to the conductive element 150 by external structures. The inner peripheral wall 1335 can extend from the slot 1333 to connect with the end face of the cover 131 opposite to the receiving cavity 111 along the first direction X.
[0036] The outer peripheral wall 151 and the inner peripheral wall 1335 can be arranged opposite to each other, that is, the inner peripheral wall 1335 can surround the outer peripheral wall 151. The outer peripheral wall 151 and the inner peripheral wall 1335 can be welded together, thereby more stably fixing the conductive element 150 to the boss 133, improving the connection strength between the conductive element 150 and the boss 133, and helping to reduce the possibility of the conductive element 150 detaching from the boss 133 due to impacts, vibrations, etc. of the single cell 100. In addition, the weld marks generated during the welding of the outer peripheral wall 151 and the inner peripheral wall 1335 can also seal the gap between the outer peripheral wall 151 and the inner peripheral wall 1335, which helps to prevent the electrolyte in the receiving cavity 111 from leaking through the gap, and also prevents dust, water and other impurities from entering the receiving cavity 111 through the gap and affecting the performance of the single cell 100. For example, the weld mark produced after welding the outer peripheral wall 151 and the inner peripheral wall 1335 can be annular to seal the annular gap between the outer peripheral wall 151 and the inner peripheral wall 1335.
[0037] According to some optional embodiments of the present invention, the end of the boss 133 facing away from the cover 131 may have a first end face 1337, and the end of the conductive member 150 facing away from the cover 131 may have a second end face 153.
[0038] The slot 1333 is located on the first end face 1337, through which the conductive element 150 can enter the groove 1331. The first end face 1337 and the second end face 153 are flush and can be welded together, thereby more stably fixing the conductive element 150 to the boss 133, improving the connection strength between the conductive element 150 and the boss 133, and helping to prevent the conductive element 150 from detaching from the boss 133 due to impacts, vibrations, etc. of the single cell 100. In addition, the weld marks produced by welding the first end face 1337 and the second end face 153 can also seal the gap between the first end face 1337 and the second end face 153, which helps to prevent the electrolyte in the receiving cavity 111 from leaking through the gap, and also prevents dust, water and other impurities from entering the receiving cavity 111 through the gap and affecting the performance of the single cell 100. For example, the weld mark produced after welding the first end face 1337 and the second end face 153 can be annular to seal the annular gap between the first end face 1337 and the second end face 153.
[0039] According to some embodiments of the present invention, the second connecting portion 1733 can abut against the conductive member 150 and the top cover 130, that is, the conductive member 150 can press the second connecting portion 1733 against the top cover 130, thereby positioning the second connecting portion 1733 without the need for an additional positioning structure, reducing the manufacturing cost of the single battery 100 and simplifying the assembly process of the single battery 100; furthermore, the second connecting portion 1733 can directly contact the conductive member 150 and the top cover 130, and there can be direct conductive contact between the second connecting portion 1733 and the conductive member 150 without the need for an additional adapter structure, further reducing the current transmission impedance between the conductive member 150 and the second connecting portion 1733, and there can be direct conductive contact between the second connecting portion 1733 and the top cover 130, thereby eliminating the need for an insulating structure between the second connecting portion 1733 and the top cover 130, reducing the manufacturing cost of the single battery 100 and simplifying the assembly process of the single battery 100.
[0040] The second connecting part 1733 abuts against the conductive member 150 and the top cover 130. Specifically, the second connecting part 1733 abuts against the conductive member 150 and the cover 131, that is, the conductive member 150 presses the second connecting part 1733 against the cover 131.
[0041] According to some embodiments of the present invention, the conductive element 150 and the top cover 130 can be electrically connected, thereby eliminating the need for an insulating structure between the conductive element 150 and the top cover 130, reducing the manufacturing cost of the single cell 100, and simplifying the assembly process of the single cell 100. Specifically, the conductive element 150 is electrically connected to the boss 133.
[0042] The conductive element 150 and the top cover 130 can be electrically connected in various ways.
[0043] According to some examples of the invention, the conductive element 150 may be soldered to the top cover 130.
[0044] According to further examples of the present invention, the single cell 100 may also include conductive adhesive, which can be bonded between the conductive element 150 and the top cover 130.
[0045] The second connecting part 1733 and the conductive part 150 can also adopt other electrical connection methods; the above are only examples for the purpose of understanding.
[0046] According to some embodiments of the present invention, the first tab 173 can be an integrally formed structure, that is, the first connecting part 1731 and the second connecting part 1733 can be an integrally formed structure, thereby improving the structural strength of the first tab 173 and avoiding the situation where the solder marks generated by the welding connection of the first connecting part 1731 and the second connecting part 1733 block the current.
[0047] There may be a clear dividing line between the first connecting portion 1731 and the second connecting portion 1733, or there may be no dividing line. For example, the portion of the first electrode tab 173 located within the first through hole 1313 and the receiving cavity 111 can be the first connecting portion 1731, and the remaining portion of the first electrode tab 173 can be the second connecting portion 1733.
[0048] According to some embodiments of the present invention, the first electrode 173 may include a plurality of sub-electrodes.
[0049] Each sub-tab may include a first segment and a second segment. The first segment is connected to the cell body 171, and the second segment is connected to the side of the first segment away from the cell body 171. The first segments of each sub-tab are stacked to form a first connection portion 1731, and the second segments of each sub-tab are stacked to form a second connection portion 1733. In this way, by setting multiple sub-tabs, the cross-sectional area of the first connection portion 1731 and the second connection portion 1733 is increased, the current carrying capacity of the first tab 173 is improved, and the current can be more quickly introduced into / outsourced to the cell body 171 through multiple sub-tabs, thereby improving the charge and discharge rate of the single cell 100.
[0050] According to some examples of the present invention, the first segment of each sub-electrode can be stacked along the second direction Y to form a first connecting portion 1731, and the second segment of each sub-electrode can be stacked along the first direction X to form a second connecting portion 1733.
[0051] According to some embodiments of the present invention, the first connecting portion 1731 can extend along the first direction X and pass through the first through hole 1313. In this way, the first connecting portion 1731 extends in a generally straight line without bending, thus extending the service life of the first connecting portion 1731.
[0052] The second connecting portion 1733 extends along the second direction Y, meaning that the first connecting portion 1731 and the second connecting portion 1733 can be connected by a sandwich, thereby making better use of the space between the top cover 130 and the conductive member 150 in the second direction Y, reducing the space occupied by the second connecting portion 1733 in the first direction X, and helping to reduce the height of the single cell 100.
[0053] like Figures 2 to 4 As shown, according to some embodiments of the present invention, the first connecting portion 1731 may include a first sub-portion 1735 and a second sub-portion 1737, and the second connecting portion 1733 may include a third sub-portion 1739 and a fourth sub-portion 1741.
[0054] The top cover 130 may have two first through holes 1313, which may be spaced apart along the second direction Y. The first sub-part 1735 and the second sub-part 1737 may both be connected to the cell body 171 and pass through one of the first through holes 1313 respectively. The third sub-part 1739 may be connected to the side of the first sub-part 1735 away from the cell body 171, and the fourth sub-part 1741 may be connected to the side of the second sub-part 1737 away from the cell body 171. That is, the first tab 173 may include two tab bundles, one of which includes the connected first sub-part 1735 and third sub-part 1739, and the other tab bundle includes the connected second sub-part 1737 and fourth sub-part 1741.
[0055] According to some examples of embodiments of the present invention, the first sub-part 1735 may include at least one first segment, the second sub-part 1737 may include at least one first segment, the third sub-part 1739 may include at least one second segment, and the fourth sub-part 1741 may include at least one second segment. At least one segment can be one or more segments, and more than one segment can be two or more segments.
[0056] The third sub-part 1739 and the fourth sub-part 1741 are both fixed between the conductive member 150 and the top cover 130, and are both electrically connected to the conductive member 150. Thus, the first tab 173 can be electrically connected to the conductive member 150 simultaneously through the third sub-part 1739 and the fourth sub-part 1741. That is, the two tab bundles are simultaneously connected to the conductive member 150, which helps to increase the conduction area of the first tab 173 and the conductive member 150, further reducing the current transmission impedance and further improving the overcurrent capability of the single cell 100. In addition, the two tab bundles can form two current transmission channels between the cell body 171 and the conductive member 150, further improving the overcurrent capability of the single cell 100.
[0057] The third sub-section 1739 and the fourth sub-section 1741 extend towards or away from each other along the second direction Y, thereby making better use of the space between the top cover 130 and the conductive element 150 in the second direction Y, reducing the space occupied by the third sub-section 1739 and the fourth sub-section 1741 in the first direction X, and helping to reduce the impact of the third sub-section 1739 and the fourth sub-section 1741 on the height dimension of the single cell 100. The third sub-section 1739 and the fourth sub-section 1741 can be in contact with each other or spaced apart.
[0058] It should be noted that in this embodiment, the number of battery cell bodies 171 can be one or two.
[0059] Some examples of embodiments of the present invention, such as Figure 2 As shown, when the number of cell bodies 171 is one, that is, the cell 170 may include one cell body 171 and one first tab 173. The first sub-part 1735 and the second sub-part 1737 can both be connected to the same cell body 171, and the first sub-part 1735 and the second sub-part 1737 are respectively disposed in a first through hole 1313.
[0060] Other examples of embodiments of the present invention, such as Figures 3 to 4 As shown, when there are two battery cell bodies 171, the two battery cell bodies 171 can share a first tab 173, that is, the battery cell 170 can include two battery cell bodies 171 and a first tab 173. The first sub-part 1735 can be connected to one battery cell body 171 and pass through a first through hole 1313, and the second sub-part 1737 can be connected to the other battery cell body 171 and pass through another first through hole 1313.
[0061] like Figure 5 As shown, according to some embodiments of the present invention, in this embodiment, the first tab 173 may include a first connecting portion 1731 and a second connecting portion 1733, and the second connecting portion 1733 may include a third sub-portion 1739 and a fourth sub-portion 1741.
[0062] The third sub-part 1739 and the fourth sub-part 1741 can both be connected to the first connecting part 1731. The third sub-part 1739 and the fourth sub-part 1741 are both fixed between the conductive member 150 and the top cover 130, and are both electrically connected to the conductive member 150. Thus, the first electrode 173 can be electrically connected to the conductive member 150 simultaneously through the third sub-part 1739 and the fourth sub-part 1741, which helps to increase the conduction area of the first electrode 173 and the conductive member 150, further reduces the current transmission impedance, and further improves the overcurrent capability of the single cell 100.
[0063] The third sub-section 1739 and the fourth sub-section 1741 extend opposite to each other along the second direction Y, thereby making better use of the space between the top cover 130 and the conductive member 150 in the second direction Y, reducing the space occupied by the third sub-section 1739 and the fourth sub-section 1741 in the first direction X, and helping to reduce the impact of the third sub-section 1739 and the fourth sub-section 1741 on the height dimension of the single cell 100.
[0064] It should be noted that in this embodiment, the number of battery cell bodies 171 can be one or two.
[0065] Some examples of embodiments of the present invention, such as Figure 5 As shown, when the number of cell bodies 171 is one, that is, the cell 170 may include one cell body 171 and one first tab 173. The first connecting part 1731 is connected to the cell body 171 and passes through the first through hole 1313. The third sub-part 1739 and the fourth sub-part 1741 are both connected to the side of the first connecting part 1731 away from the cell body 171.
[0066] According to other examples of embodiments of the present invention, when the number of battery cell bodies 171 is two, the number of first through holes 1313 and the number of first tabs 173 can both be equal to the number of battery cell bodies 171, that is, the number of first through holes 1313 can also be two, and the number of first tabs 173 can also be two. The battery cell bodies 171, first tabs 173, and first through holes 1313 can correspond one-to-one. The first connecting portion 1731 of each first tab 173 is connected to one battery cell body 171 and passes through one first through hole 1313. In each first tab 173, the third sub-part 1739 and the fourth sub-part 1741 can extend opposite to each other along the second direction Y.
[0067] like Figure 1 , Figure 2 and Figure 6 As shown, according to some embodiments of the present invention, the single cell 100 may further include a terminal post 190 and an insulator 210, and the cell 170 may further include a second tab 175.
[0068] The top cover 130 may have a through second through hole 1315, which can penetrate the top cover 130 along a first direction X. For example, the cover body 131 may have a through second through hole 1315. The second through hole 1315 and the first through hole 1313 may be spaced apart along a third direction Z. The second through hole 1315 can connect to the receiving cavity 111. The pole post 190 can pass through the second through hole 1315. The insulating member 210 is connected between the top cover 130 and the pole post 190, so that the insulating member 210 can separate the top cover 130 and the pole post 190, thereby insulating the top cover 130 and the pole post 190.
[0069] The second tab 175 and the first tab 173 have opposite polarities. For example, one of the second tab 175 and the first tab 173 can be a positive tab, and the other can be a negative tab. The second tab 175 is connected to the side of the cell body 171 facing the opening 1113 along the first direction X, and is electrically connected to the terminal post 190. Since the terminal post 190 and the top cover 130 are insulated, the second tab 175 and the first tab 173 are also insulated. Therefore, the single cell 100 of this embodiment only needs to provide an insulating member 210 between the second tab 175 and the top cover 130 to insulate the second tab 175 and the first tab 173. There is no need to provide an insulating structure between the first tab 173 and the top cover 130, which reduces the manufacturing cost of the single cell 100 and simplifies the assembly process of the single cell 100.
[0070] According to some examples of the present invention, the cell body 171 may include a first electrode, a second electrode, and a separator, the separator being disposed between the first electrode and the second electrode. The first electrode, separator, and second electrode are stacked and then wound to form a wound cell, or the first electrode, separator, and second electrode are stacked to form a laminated cell. One of the first electrode and the second electrode may be a positive electrode, and the other may be a negative electrode. A first tab 173 may be connected to the first electrode, and a second tab 175 may be connected to the second electrode.
[0071] According to some embodiments of the present invention, the insulating member 210 may include a first insulating member 211 and a second insulating member 213.
[0072] The first insulating member 211 can be disposed in the receiving cavity 111 and can be located between the top cover 130 and the battery cell body 171. The first insulating member 211 can be connected to the top cover 130. The second insulating member 213 is located on the side of the top cover 130 opposite to the receiving cavity 111 along the first direction X and is connected to the top cover 130. The first insulating member 211 and the top cover 130 can be connected and fixed by bonding, snap-fitting, injection molding or other means. The second insulating member 213 and the top cover 130 can be connected and fixed by bonding, snap-fitting, injection molding or other means.
[0073] The first insulating member 211 may have a through-hole 2113, which extends through the first insulating member 211 along the first direction X. The second insulating member 213 may have a through-hole 2131, which extends through the second insulating member 213 along the first direction X. The third through-hole 2113, the second through-hole 2115, and the fourth through-hole 2131 are sequentially connected along the first direction X. The pole post 190 also passes through the third through-hole 2113 and the fourth through-hole 2131, that is, the pole post 190 passes through the third through-hole 2113, the second through-hole 1315, and the fourth through-hole 2131 sequentially. The pole post 190 may be connected and fixed to at least one of the first insulating member 211 and the second insulating member 213 to fix the pole post 190 to the top cover 130 and to ensure that the pole posts 190 are insulated from each other.
[0074] The first insulating element 211 and the first electrode 173 are distributed along the third direction Z and are spaced apart, which can shorten the extension length of the first insulation along the third direction Z, reduce the amount of material used in the first insulating element 211, reduce the manufacturing cost of the first insulating element 211, and further simplify the assembly process of the single cell 100 since the first insulating element 211 and the first electrode 173 are not connected.
[0075] The second tab 175 can be soldered to the pole post 190, or the second tab 175 can be electrically connected to the pole post 190 through an adapter structure.
[0076] According to some examples of the present invention, the single cell 100 may further include an electrical connector 230. The electrical connector 230 may be located within the receiving cavity 111 and between the cell body 171 and the first insulator 211. The electrical connector 230 and the terminal post 190 may be opposite each other along a first direction X, and the electrical connector 230 may be connected to the terminal post 190. For example, the electrical connector 230 may be welded to the terminal post 190, and the second tab 175 may be welded to the side of the electrical connector 230 opposite to the terminal post 190, thereby enabling conductivity between the terminal post 190 and the second tab 175. The connection method between the first insulator 211, the second insulator 213, the top cover 130, the terminal post 190, the electrical connector 230, and the second tab 175 can refer to the prior art and will not be described in detail here.
[0077] Other components of the single-cell battery 100 according to embodiments of the present invention, such as the cell body 171 and the insulating member 210, as well as their operation, are known to those skilled in the art and will not be described in detail here.
[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0079] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A single-cell battery (100) having a first orientation (X), characterized in that, include: The housing (110) has a receiving cavity (111) with an opening (1113) at one end along the first direction (X). A top cover (130) is connected to the housing (110) and closes the opening (1113). The top cover (130) is provided with a through hole (1313) that communicates with the receiving cavity (111). A conductive element (150) is connected to the top cover (130) on the side opposite to the receiving cavity (111) along the first direction (X); The battery cell (170) includes a battery cell body (171) and a first tab (173). The battery cell body (171) is disposed in the receiving cavity (111). The first tab (173) includes a first connecting portion (1731) and a second connecting portion (1733). The first connecting portion (1731) is connected to the side of the battery cell body (171) facing the opening (1113) along the first direction (X) and passes through the first through hole (1313). The second connecting portion (1733) is connected to the side of the first connecting portion (1731) away from the battery cell body (171) and is fixed between the conductive member (150) and the top cover (130). The second connecting portion (1733) is electrically connected to the conductive member (150).
2. The single-cell battery (100) according to claim 1, characterized in that, The top cover (130) includes a cover body (131) and a boss (133). The cover body (131) is connected to the housing (110) and closes the opening (1113). The cover body (131) is provided with the first through hole (1313). The boss (133) is connected to the side of the cover body (131) facing away from the receiving cavity (111) along the first direction (X). The boss (133) is provided with a groove (1331), which is located on the side of the first through hole (1313) facing away from the receiving cavity (111) along the first direction (X) and is connected to the first through hole (1313); the second connecting part (1733) is located in the groove (1331); the side of the groove (1331) facing away from the first through hole (1313) has a slot (1333), and the conductive element (150) is connected to the boss (133) and closes the slot (1333).
3. The single-cell battery (100) according to claim 2, characterized in that, The conductive element (150) is at least partially disposed within the groove (1331); The groove (1331) has an inner peripheral wall (1335), and the conductive element (150) has an outer peripheral wall (151) opposite to the inner peripheral wall (1335). The outer peripheral wall (151) and the inner peripheral wall (1335) are welded together. And / or, the boss (133) has a first end face (1337) at the end opposite to the cover (131), the slot (1333) is provided on the first end face (1337), the conductive element (150) has a second end face (153) at the end opposite to the cover (131), the first end face (1337) and the second end face (153) are flush, and the first end face (1337) and the second end face (153) are welded together.
4. The single-cell battery (100) according to claim 1, characterized in that, The second connecting part (1733) abuts between the conductive element (150) and the top cover (130).
5. The single-cell battery (100) according to claim 1, characterized in that, The conductive element (150) and the top cover (130) are electrically connected.
6. The single-cell battery (100) according to claim 1, characterized in that, The single cell (100) also has a second direction (Y), which is perpendicular to the first direction (X); The first connecting portion (1731) extends along the first direction (X) and passes through the first through hole (1313), and the second connecting portion (1733) extends along the second direction (Y).
7. The single-cell battery (100) according to claim 1, characterized in that, The single cell (100) also has a second direction (Y), which is perpendicular to the first direction (X); The top cover (130) is provided with two first through holes (1313), and the two first through holes (1313) are distributed at intervals along the second direction (Y); The first connecting portion (1731) includes a first sub-part (1735) and a second sub-part (1737), both of which are connected to the battery cell body (171) and pass through a first through hole (1313); the second connecting portion (1733) includes a third sub-part (1739) and a fourth sub-part (1741), the third sub-part (1739) being connected to the side of the first sub-part (1735) away from the battery cell body (171), and the fourth sub-part (1741) being connected to the side of the second sub-part (1737) away from the battery cell body (171); The third sub-part (1739) and the fourth sub-part (1741) are both fixed between the conductive element (150) and the top cover (130) and are both electrically connected to the conductive element (150). The third sub-part (1739) and the fourth sub-part (1741) extend towards or away from each other along the second direction (Y).
8. The single-cell battery (100) according to claim 1, characterized in that, The single cell (100) also has a second direction (Y), which is perpendicular to the first direction (X); The second connecting portion (1733) includes a third sub-part (1739) and a fourth sub-part (1741); both the third sub-part (1739) and the fourth sub-part (1741) are connected to the first connecting portion (1731), both the third sub-part (1739) and the fourth sub-part (1741) are fixed between the conductive member (150) and the top cover (130), and both are electrically connected to the conductive member (150); the third sub-part (1739) and the fourth sub-part (1741) extend in opposite directions along the second direction (Y).
9. The single-cell battery (100) according to claim 1, characterized in that, The single cell (100) also has a third direction (Z), which is perpendicular to the first direction (X); The single battery cell (100) further includes an electrode post (190) and an insulating member (210). The top cover (130) is provided with a through second through hole (1315). The second through hole (1315) and the first through hole (1313) are distributed at intervals along the third direction (Z). The second through hole (1315) communicates with the receiving cavity (111). The electrode post (190) passes through the second through hole (1315). The insulating member (210) is connected between the top cover (130) and the electrode post (190). The battery cell (170) also includes a second tab (175), which has the opposite polarity to the first tab (173). The second tab (175) is connected to the side of the battery cell body (171) facing the opening (1113) along the first direction (X) and is electrically connected to the terminal post (190).
10. The single-cell battery (100) according to claim 9, characterized in that, The insulating component (210) includes a first insulating component (211) and a second insulating component (213). The first insulating component (211) is disposed in the receiving cavity (111) and located between the top cover (130) and the battery cell body (171). The first insulating component (211) is connected to the top cover (130). The first insulating component (211) and the first electrode (173) are distributed along the third direction (Z) and are spaced apart. The second insulating component (213) is located on the side of the top cover (130) facing away from the receiving cavity (111) along the first direction (X) and is connected to the top cover (130). The first insulating member (211) is provided with a through third through hole (2113), and the second insulating member (213) is provided with a through fourth through hole (2131). The third through hole (2113), the second through hole (1315), and the fourth through hole (2131) are connected sequentially along the first direction (X). The pole post (190) is also provided through the third through hole (2113) and the fourth through hole (2131).
11. A battery pack, characterized in that, Includes a single cell (100) according to any one of claims 1 to 10.