Battery cell and battery

Abstract

The utility model relates to a battery cell and a battery. The battery cell comprises an end cover, a pole assembly, an electrode assembly, a first adapter plate and a second adapter plate, the pole assembly is arranged on the end cover, a tab is arranged on a first surface of the electrode assembly in the height direction of the battery cell, and the tab is provided with a lap joint surface which is higher than the first surface and is relatively spaced from the end cover. The first adapter piece and the second adapter piece are sequentially arranged in the height direction, the first adapter piece is arranged between the end cover and the lap joint face and electrically connected with the pole assembly and the lap joint face, and the second adapter piece is located between the first adapter piece and the first surface and electrically connected with the pole lug and the first adapter piece. According to the technical scheme, the problem of local high temperature caused by insufficient over-current capability of the switching structure can be solved, the accuracy of NTC temperature detection is improved, and the space utilization rate of the battery cell can also be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery cells and batteries. Background Art

[0002] Battery cell temperature directly impacts the lifespan and even safety of electric vehicle batteries. Typically, a negative temperature coefficient thermistor (NTC) is used to monitor battery temperature and prevent overheating or underheating that could affect battery life. NTCs are typically placed on the positive and negative external busbars, which are welded to the battery cell terminals. By monitoring the busbar temperature, the NTC indirectly reflects the battery cell temperature.

[0003] The cell poles connect to the tabs of the internal electrode assembly via a transition structure. High-rate or high-power battery systems feature high charge and discharge rates and large currents. However, due to space and weight constraints within the cell, the internal transition structure's flow area is typically small, leading to localized high temperatures. This causes the NTC to detect abnormally high temperatures and fail to accurately reflect the cell temperature. Simply increasing the thickness of the transition structure to increase the flow area would increase the height space occupied by the transition structure, reducing the cell's space utilization. Utility Model Content

[0004] Based on this, the present application proposes a battery cell and a battery that can take into account both the overcurrent capacity of the switching structure and the space utilization of the battery cell, thereby improving the accuracy of NTC temperature detection.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, comprising:

[0006] end caps;

[0007] A pole assembly, provided on the end cover;

[0008] An electrode assembly, wherein a tab is provided on a first surface in a height direction of the battery core, the tab having an overlapping surface that is higher than the first surface and spaced apart from the end cap;

[0009] The first adapter plate and the second adapter plate are arranged sequentially in the height direction. The first adapter plate is arranged between the end cover and the overlapping surface, and electrically connects the pole assembly and the overlapping surface; the second adapter plate is located between the first adapter plate and the first surface, and electrically connects the pole ear and the first adapter plate.

[0010] In some embodiments, a plug-in portion is provided on the tab, and the second adapter is plugged into the plug-in portion.

[0011] In some embodiments, the plug-in portion includes a plug-in gap formed in the tab, and the plug-in gap is located on a side of the overlap surface away from the end cap;

[0012] The second adapter piece can be plugged into the plugging gap along a first direction intersecting the height direction.

[0013] In some embodiments, a window is further provided on the tab, which passes through the overlapping surface and communicates with the plug-in gap, and a portion of the second adapter plate passes through the window and fits with the first adapter plate.

[0014] In some embodiments, the second adapter plate is recessed toward the first surface to form a stepped surface, and a protruding portion is convexly provided on the stepped surface;

[0015] The step surface is located in the plug-in gap and fits with the tab; the protrusion passes through the window and fits with the first adapter.

[0016] In some embodiments, the tab includes two folded tabs arranged opposite to each other in the second direction, and each of the folded tabs is bent toward each other and encloses the insertion gap.

[0017] In some embodiments, a clamping portion is provided on the end cover or the first adapter plate, and the clamping portion clamps the second adapter plate.

[0018] In some embodiments, the second adapter plate includes a first section and a second section adjacently arranged in a first direction intersecting the height direction, the first section is connected to the first adapter plate and is clamped with the clamping portion; the second section is plugged into the plug-in portion on the tab.

[0019] In some embodiments, the first section and the second section jointly form a stepped surface facing the first surface, and the second section is arranged closer to the first surface than the first section, and the clamping portion is partially accommodated in the stepped space formed by the stepped surface and abuts against the stepped surface in the first direction.

[0020] In some embodiments, the end cover includes a plastic part located on an inner side thereof, the pole assembly passes through the plastic part and is connected to the first adapter piece.

[0021] In some embodiments, the clamping portion includes a pair of clamping ears, and the two pairs of clamping ears are spaced apart in the second direction to form a clamping space for clamping the first adapter plate and the second adapter plate; the first direction, the second direction and the height direction are not coplanar and intersect with each other.

[0022] In a second aspect, the present application provides a battery comprising the battery cell in the above embodiment.

[0023] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0024] The above-mentioned battery cell and battery, the first adapter plate and the second adapter plate together constitute a transfer structure for electrically connecting the pole ear and the pole assembly. By adding the second adapter plate in the gap space between the first adapter plate and the first surface, the second adapter plate is connected to the pole ear in parallel with the first adapter plate, which not only increases the flow area of ​​the transfer structure and improves its flow capacity, thereby improving the local high temperature problem caused by insufficient flow capacity of the transfer structure and improving the accuracy of NTC temperature detection, but also makes full use of the gap space between the first adapter plate and the first surface without adding extra space in the height direction of the battery cell, thereby improving the space utilization rate of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0026] Figure 1 Schematic diagrams of the appearance of battery cells in some embodiments.

[0027] Figure 2 A partial cross-sectional view of a battery cell according to some embodiments.

[0028] Figure 3 This is a schematic diagram of the internal structure of the battery cell of some embodiments after removing the shell and end cover.

[0029] Figure 4 Schematic diagram of the structure of the end cover of some embodiments.

[0030] Figure 5 Schematic diagram of a portion of the structure of a battery cell in some embodiments

[0031] Figure 6 Schematic diagram of the assembly of the tab and the second adapter in some embodiments.

[0032] Figure 7 Schematic diagram of the structure of the second adapter in some embodiments.

[0033] Figure 8 for Figure 7 Another orientation view of the second adapter is shown.

[0034] Figure 9 Schematic diagram of the assembly of the second adapter plate and the clamping portion in some embodiments.

[0035] Figure 10 A partial cross-sectional view of a battery cell according to some embodiments.

[0036] The accompanying drawings in the specific implementation manner are as follows:

[0037] 100. Battery cell; Z, height direction; X, first direction; Y, second direction; 10. End cap; 11. Plastic part; K, snap-fit ​​portion; 11a, snap ear; 12. Mounting hole; 20. Post assembly; 30. Electrode assembly; m1, first surface; 31. Ear; 31a, overlap surface; 31b, plug-in portion; b1, plug-in gap; 31c, window; 31A, folded ear; 40. First adapter; 50. Second adapter; 51. First section; 52. Second section; m2, step surface; T, protrusion; m3, step surface; 60. Shell. DETAILED DESCRIPTION

[0038] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0039] In the description of the present application, it should be understood that, if any, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] Furthermore, if used, the terms "first" and "second," if present, 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 being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0041] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connected," and "fixed" should be interpreted broadly. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0042] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0043] It should be noted that, if present, when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate 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 embodiments.

[0044] In response to the problems raised in the background technology, this application first proposes a battery cell.

[0045] Figure 1 Schematic diagram of the appearance of the battery cell 100 in some embodiments. Figure 2 FIG. 1 is a partial cross-sectional view of a battery cell 100 according to some embodiments. Figure 3 Schematic diagram of the internal structure of the battery cell 100 after removing the casing 60 and the end cover 10 in some embodiments. Figure 4 Schematic diagram of the structure of the end cover 10 in some embodiments.

[0046] Please refer to Figure 1 、 Figure 2 and Figure 3The battery cell 100 provided in the embodiment of the present application includes an end cap 10, a pole assembly 20, an electrode assembly 30, a first adapter plate 40, and a second adapter plate 50. The pole assembly 20 is provided on the end cap 10, and the electrode assembly 30 is provided with a pole tab 31 on the first surface m1 in the height direction Z of the battery cell 100. The pole tab 31 has a lap joint 31a that is higher than the first surface m1 and spaced relative to the end cap 10. The first adapter plate 40 and the second adapter plate 50 are arranged in sequence in the height direction Z. The first adapter plate 40 is arranged between the end cap 10 and the lap joint 31a, and electrically connects the pole assembly 20 and the lap joint 31a. The second adapter plate 50 is located between the first adapter plate 40 and the first surface m1, and electrically connects the pole tab 31 and the first adapter plate 40.

[0047] Understandably, if Figure 1 As shown, the battery cell 100 generally further includes a shell 60, which encloses a space with an opening, in which the electrode assembly 30 is accommodated, and the end cap 10 covers the opening of the space. The end cap 10 and the shell 60 can be sealed by snapping, welding, or the like. The shell 60 and the end cap 10 can be, but are not limited to, aluminum parts or steel parts with high strength. The end cap 10 is arranged at one end or opposite ends of the shell 60. When the end cap 10 is arranged at one end of the shell 60, the end cap 10 is generally arranged at the top of the shell 60. When the end cap 10 is arranged at both ends of the shell 60, the end cap 10 can be arranged at both the bottom and the top of the shell 60.

[0048] like Figure 4 As shown, a mounting hole 12 can be provided on the end cap 10, and the pole assembly 20 is mounted at the mounting hole 12. In some examples, the pole assembly 20 includes a pole (not shown) and an insulating sleeve (not shown). The insulating sleeve is embedded in the mounting hole 12, and the pole is assembled in the insulating sleeve. The insulating sleeve insulates the end cap 10 and the pole to prevent leakage of the end cap 10. The pole is conductive and can be a copper part with good thermal conductivity. In some examples, the end cap 10 is a plastic part that is self-insulating, and the pole assembly 20 can only include the pole disposed in the mounting hole 12.

[0049] Two sets of electrode assemblies 20 can be provided on the end cap 10, with one set serving as the positive electrode and the other as the negative electrode. Alternatively, only one set of electrode assemblies 20 can be provided on the end cap 10, with this set serving as either the positive electrode or the negative electrode. Furthermore, an injection hole for injecting electrolyte into the battery cell 100 can be provided on the end cap 10, and a sealing structure such as a sealing pin can be installed at the injection hole.

[0050] The electrode assembly 30, also known as a bare cell, generally includes a positive electrode sheet, a negative electrode sheet, and an insulator insulating between the positive electrode sheet and the negative electrode sheet. The insulator may be an isolation membrane that allows ions to pass through. The electrode assembly 30 may be a laminated structure or a wound structure. The tab 31 is a metal component in the electrode assembly 30 that is electrically connected to the positive electrode sheet and the negative electrode sheet. Depending on the polarity of the connected electrode sheet, the tab 31 is divided into a positive tab and a negative tab. The positive tab is connected to the positive electrode sheet, and the negative tab is connected to the negative electrode sheet. The positive tab and the negative tab are set separately to avoid contact short circuit. The tab 31 of the electrode assembly 30 is electrically connected to the pole column assembly 20, and is connected to the external circuit through the pole column assembly 20 to realize charging and discharging of the electrode assembly 30.

[0051] like Figure 2 As shown, the electrode assembly 30 has a first surface m1 facing the end cap 10, and the first surface m1 and the end cap 10 are spaced apart in the height direction Z of the battery cell 100. The tab 31 protrudes from the first surface m1, and the first adapter plate 40, the second adapter plate 50, and the tab 31 are arranged in the space between the first surface m1 and the end cap 10.

[0052] like Figure 3 As shown, the tab 31 has a lap surface 31a that is higher than the first surface m1, that is, the lap surface 31a is closer to the end cover 10 than the first surface m1. The first adapter 40 is located between the lap surface 31a and the end cover 10 in the height direction Z of the battery cell 100, and electrically connects the two. Since the lap surface 31a is higher than the first surface m1, the first adapter 40 is spaced apart from the first surface m1. The second adapter 50 is arranged in the gap between the first adapter 40 and the first surface m1, and electrically connects the first adapter 40 and the tab 31. It should be noted that the second adapter 50 is usually spaced apart from the first surface m1 to prevent the second adapter 50 from contacting the positive and negative electrodes in the electrode assembly 30 through the first surface m1, causing an internal short circuit in the battery cell 100. It can be understood that the first adapter 40 and the second adapter 50 are conductive, and both can be copper parts with good conductive properties.

[0053] The above-mentioned battery cell 100, the first adapter plate 40 and the second adapter plate 50 together constitute a transfer structure for electrically connecting the pole ear 31 and the pole assembly 20. By adding the second adapter plate 50 in the gap space between the first adapter plate 40 and the first surface m1, the second adapter plate 50 and the first adapter plate 40 are connected to the pole ear 31 in parallel, which not only increases the flow area of ​​the transfer structure and improves its flow capacity, thereby improving the local high temperature problem caused by insufficient flow capacity of the transfer structure, and helps to improve the accuracy of NTC temperature detection, but also makes full use of the gap space between the first adapter plate 40 and the first surface m1, thereby improving the space utilization of the battery cell 100 in the height direction Z.

[0054] It should be noted that the first adapter plate 40 is usually clamped between the overlap surface 31a and the pole, and is closely attached to the overlap surface 31a. Of course, the first adapter plate 40 can also be fixedly connected to the overlap surface 31a by welding, clamping, etc. to make the connection between the two more reliable.

[0055] In some embodiments, reference Figure 3 The tab 31 is provided with an inserting portion 31 b , and the second adapter 50 is inserted into the inserting portion 31 b .

[0056] Specifically, one of the tab 31 and the second adapter plate 50 is provided with a recessed insertion portion, and the other with a protruding insertion portion, which plugs into the protruding insertion portion. This increases the contact area between the tab 31 and the second adapter plate 50, increasing the flow area between them and improving the flow capacity of the adapter structure. Furthermore, the plug-in connection simplifies the installation of the second adapter plate 50 and the tab 31.

[0057] Of course, in other embodiments, the second adapter plate 50 and the tab 31 may be electrically connected by welding or other methods.

[0058] Specifically in the embodiment, continue to refer to Figure 3 The plug-in portion 31b includes a plug-in gap b1 formed in the tab 31. The plug-in gap b1 is located on the side of the overlap surface 31a facing away from the end cap 10. The second adapter 50 can be plugged into the plug-in gap b1 along a first direction X intersecting the height direction Z.

[0059] When the battery cell 100 is a prismatic cell, the first direction X can be the length of the battery cell 100, and the second direction Y can be the width of the battery cell 100. The insertion gap b1 is a recessed portion formed in the tab 31. In the height direction Z, the insertion gap b1 is located between the lap surface 31a and the first surface m1. The second adapter plate 50 is inserted into the insertion gap b1 along the first direction X and contacts the tab 31. At least one end of the insertion gap b1 in the first direction X is open to facilitate insertion of the second adapter plate 50.

[0060] Since the space between the first surface m1 and the end cover 10 in the height direction Z is limited, the space of the battery cell 100 in the first direction X can be used to insert the second adapter 50 into the insertion gap b1 of the tab 31, which is more convenient.

[0061] It is worth adding that, in one embodiment, the pole assembly 20 and the tab 31 are arranged relative to each other along the height direction Z, that is, the pole assembly 20 is arranged directly above or directly below the tab 31, and the projections of the two along the height direction Z intersect. Figure 5 As shown, Figure 51 is a partial structural diagram of a battery cell 100 in some embodiments, in which the projections of the pole assembly 20 and the pole tab 31 along the height direction Z are staggered.

[0062] Specifically, in order to realize the transition structure connecting the pole ear 31 and the pole assembly 20, as shown in FIG. Figure 5 As shown, the first adapter plate 40 and the second adapter plate 50 both extend in a strip shape along the first direction X. A portion of the first adapter plate 40 in the first direction X is connected between the pole assembly 20 and a portion of the second adapter plate 50. Another portion of the first adapter plate 40 is connected to the overlapping surface 31a, and another portion of the second adapter plate 50 is inserted into the insertion gap b1 to achieve connection with the pole tab 31. At this time, the projections of the first adapter plate 40 and the second adapter plate 50 along the height direction Z intersect, and the adapter structure formed by the two takes up little space and has a compact structure.

[0063] Figure 6 Schematic diagram of the assembly of the tab 31 and the second adapter 50 in some embodiments.

[0064] In some embodiments, reference Figure 6 , and combined with Figure 3 The tab 31 is further provided with a window 31 c that passes through the overlap surface 31 a and communicates with the insertion gap b1 . Part of the second adapter plate 50 passes through the window 31 c and fits into the first adapter plate 40 .

[0065] Specifically, the window 31c can be closed in the first direction X, and a spring portion is provided on the second adapter plate 50. When the second adapter plate 50 is inserted into the plug-in gap b1, the spring portion is squeezed by the tab 31 without affecting its insertion. When plugged into place, the spring portion reaches the position of the window 31c, and the spring portion returns from the compressed state to the initial state, and is stuck in the window 31c, and extends out of the window 31c to connect with the first adapter plate 40.

[0066] Specifically, the window 31c can also open in the same direction as the insertion gap b1 in the first direction X. When the second adapter 50 is inserted into the insertion gap b1 along the first direction X, a part of it can also be synchronously inserted into the window 31c along the first direction X. The structure of the second adapter 50 is simpler.

[0067] At this time, the design of the window 31c increases the contact area between the second adapter plate 50 and the first adapter plate 40, improves the flow capacity therebetween, and can further improve the problem of excessively high local temperature of the adapter structure.

[0068] Figure 7 Schematic diagram of the structure of the second adapter 50 in some embodiments.

[0069] Specifically in the embodiment, the second adapter plate 50 is recessed toward the first surface m1 to form a step surface m2, and a protrusion T is protruded on the step surface m2. The step surface m2 is located in the insertion gap b1 and fits with the tab 31. The protrusion T passes through the window 31c and fits with the first adapter plate 40.

[0070] Understandably, the step surface m2 is away from the first surface m1 and is disposed toward the first adapter plate 40. A protrusion T is disposed on the step surface m2. When the portion of the second adapter plate 50 where the step surface m2 is located is inserted into the insertion gap b1 during insertion, the protrusion T penetrates the window 31c along the first direction X.

[0071] At this time, the protrusion T is integrally formed with the second adapter plate 50 , and the step surface m2 can avoid the portion of the tab 31 where the window 31 c is formed, so the structure of the second adapter plate 50 is simple.

[0072] There are many ways to form the insertion gap b1 on the tab 31. For example, a plug hole serving as the insertion gap b1 can be dug out on the tab 31. Of course, the following embodiments can also be used.

[0073] In some embodiments, reference Figure 3 The tab 31 includes two folded tabs 31A arranged opposite to each other in the second direction Y. Each folded tab 31A is bent toward each other and encloses a plug-in gap b1.

[0074] The tab 31 is typically formed by kneading together multiple tabs 31 from a pole piece of the same polarity. Specifically, among the multiple tabs 31 included in the tab 31, some of the tabs 31 are bent and kneaded in the second direction Y to form one tab 31A, while the remaining tabs 31 are bent and kneaded in the opposite direction to form another tab 31A. The two tabs 31A open relative to each other in the second direction Y. Each tab 31A is generally U-shaped, and the interior spaces of the two U-shaped tabs 31A collectively form a plug-in gap b1. The space between the two U-shaped tabs 31A in the second direction Y forms a window 31c that communicates with the plug-in gap b1.

[0075] At this time, the tab 31 is formed simply and conveniently.

[0076] In some embodiments, a clamping portion K is provided on the end cover 10 or the first adapter plate 40, and the clamping portion K clamps the second adapter plate 50. Figure 4 As shown, the inner side of the end cover 10 is provided with a clamping portion K. In other embodiments not shown, the clamping portion K may be provided on the first adapter plate 40 .

[0077] At this time, the second adapter plate 50 is engaged by the engaging portion K, thereby improving the installation reliability of the second adapter plate 50 .

[0078] When the clamping portion K is provided on the end cap 10, the clamping portion K can be an insulating portion to insulate the end cap 10 from the second clamping piece. When the clamping portion K is provided on the first adapter piece 40, the clamping portion K and the second adapter piece can be electrically connected, increasing the flow area between the second adapter piece 50 and the first adapter piece 40, thereby improving the flow capacity of the adapter structure.

[0079] Specifically in the embodiment, refer to Figure 6 The second adapter plate 50 includes a first section 51 and a second section 52 adjacently arranged in a first direction X intersecting the height direction Z. The first section 51 is connected to the first adapter plate 40 and is engaged with the engaging portion K. The second section 52 is engaged with the inserting portion 31b on the tab 31.

[0080] Specifically, the first section 51 is positioned directly opposite the pole assembly 20, and the second section 52 is plugged into the plug portion 31b. The clip portion K is clipped into the first section 51, and the clip portion K is staggered with the tab 31. One end of the second adapter 50 in the first direction X is plugged into the tab 31, and the other end is clipped into the clip portion K, ensuring uniform force and stable installation.

[0081] Figure 8 for Figure 7 Another orientation view of the second adapter plate 50 is shown. Figure 9 FIG. 5 is a schematic diagram of the assembly of the second adapter plate 50 and the clamping portion K in some embodiments.

[0082] Further to the embodiment, combined with Figure 8 and Figure 9 The first section 51 and the second section 52 jointly form a step surface m3 facing the first surface m1, and the second section 52 is arranged closer to the first surface m1 than the first section 51. The clamping portion K is partially accommodated in the step space formed by the step surface m3 and abuts against the step surface m3 in the first direction X.

[0083] The spacing distance between the first section 51 and the first surface m1 is greater than the spacing distance between the second section 52 and the first surface m1, so that a step surface m3 is formed between the first section 51 and the second section 52. Part of the clamping portion K extends into the stepped space formed by the step surface m3, and the second adapter plate 50 is clamped, which can fully utilize the space of the battery cell 100 in the height direction Z.

[0084] Furthermore, the engaging portion K abuts against the stepped surface m3 in the first direction X. Through the stepped surface m3, the engaging portion K can limit the position of the second adapter plate 50 in the first direction X. When the second adapter plate 50 is inserted into the insertion gap b1 along the first direction X, the abutment between the stepped surface m3 and the engaging portion K ensures that the second adapter plate 50 is properly inserted. This further facilitates installation of the second adapter plate 50.

[0085] Specifically in the embodiment, refer to Figure 4 and Figure 9 The end cover 10 includes a plastic part 11 located on the inner side thereof. The pole assembly 20 passes through the plastic part 11 and is connected to the first adapter plate 40 .

[0086] The end cap 10 is usually made of a metal material with high strength, and a plastic part 11 is provided inside the end cap 10 . The plastic part 11 can insulate and isolate the end cap 10 from the electrode assembly 30 to prevent the end cap 10 from leaking electricity.

[0087] Figure 10 FIG. 1 is a partial cross-sectional view of a battery cell 100 according to some embodiments.

[0088] Further, combined with Figure 4 、 Figure 9 and Figure 10 The clamping portion K includes a pair of clamping ears 11a, and the two clamping ears 11a are spaced apart in the second direction Y to form a clamping space for clamping the first adapter plate 40 and the second adapter plate 50. The first direction X, the second direction Y and the height direction Z are not coplanar and intersect each other.

[0089] The first direction X, the second direction Y, and the height direction Z are substantially perpendicular to each other. The clamping portion K includes at least one pair of clamping ears 11a. Multiple pairs of clamping ears 11a are sequentially arranged along the first direction X. The two pairs of clamping ears 11a are spaced apart in the second direction Y to form a clamping space, within which the first adapter plate 40 and the second adapter plate 50 are both clamped. This utilizes the same clamping portion K to simultaneously strengthen the installation strength of the first adapter plate 40 and the second adapter plate 50, thereby improving the utilization rate of the clamping portion K. Furthermore, with the support of the clamping portion K, the electrical contact between the first adapter plate 40 and the second adapter plate 50 is more reliable.

[0090] In a specific embodiment of the present application, a battery cell 100 includes an end cap 10, a terminal assembly 20, an electrode assembly 30, a first adapter plate 40, and a second adapter plate 50. The electrode assembly 30 has a first surface m1 facing the end cap 10, and a tab 31 protrudes from the first surface m1. The tab 31 is staggered with respect to the projection of the terminal assembly 20 along the height direction Z. A plastic part 11 is provided on the inner side of the end cap 10, and a latch 11a is provided on the plastic part 11. The first section 51 of the second adapter plate 50 is in close contact with one end of the first adapter plate 40 in the first direction X and is simultaneously held by the two paired latches 11a. The first adapter plate 40 is electrically connected to the terminal assembly 20. The other end of the first adapter plate 40 in the first direction X is in close contact with the overlapping surface 31a on the tab 31, and the second section 52 of the second adapter plate 50 is inserted into the insertion gap b1 of the tab 31, and the protrusion thereon passes through the window 31c on the tab 31 and contacts the first adapter plate 40.

[0091] In addition, embodiments of the present application further provide a battery comprising the battery cell 100 of the aforementioned embodiment, which exhibits all the beneficial effects described in the aforementioned embodiment. Typically, the battery further comprises an enclosure that encapsulates the battery cell 100. The enclosure can be a closed box or a non-enclosed structure that bundles the battery cells 100 together.

[0092] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0093] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A battery cell (100), characterized in that: include: End cap (10); A pole assembly (20) is provided on the end cover (10); An electrode assembly (30) having a tab (31) provided on a first surface (m1) in a height direction (Z) of the battery cell (100), the tab (31) having a lap surface (31a) that is arranged higher than the first surface (m1) and spaced relative to the end cover (10); A first adapter plate (40) and a second adapter plate (50) are arranged in sequence in the height direction (Z), wherein the first adapter plate (40) is arranged between the end cover (10) and the overlap surface (31a), and electrically connects the pole assembly (20) and the overlap surface (31a); and the second adapter plate (50) is located between the first adapter plate (40) and the first surface (m1), and electrically connects the pole lug (31) and the first adapter plate (40).

2. The battery cell (100) according to claim 1, characterized in that The pole tab (31) is provided with an inserting portion (31b), and the second adapter piece (50) is inserted into the inserting portion (31b).

3. The battery cell (100) according to claim 2, characterized in that The plug-in portion (31b) includes a plug-in gap (b1) formed in the tab (31), and the plug-in gap (b1) is located on a side of the overlap surface (31a) facing away from the end cover (10); The second adapter plate (50) can be plugged into the plugging gap (b1) along a first direction (X) intersecting the height direction (Z).

4. The battery cell (100) according to claim 3, characterized in that The tab (31) is also provided with a window (31c) that passes through the overlap surface (31a) and communicates with the plug-in gap (b1); a portion of the second adapter plate (50) passes through the window (31c) and fits with the first adapter plate (40).

5. The battery cell (100) according to claim 4, characterized in that: The second adapter plate (50) is recessed toward the first surface (m1) to form a stepped surface (m2), and a protruding portion (T) is convexly provided on the stepped surface (m2); The step surface (m2) is located in the plug-in gap (b1) and fits with the tab (31); the protrusion (T) passes through the window (31c) and fits with the first adapter plate (40).

6. The battery cell (100) according to claim 3, characterized in that The pole ear (31) comprises two folded ears (31A) arranged opposite to each other in the second direction (Y), and each of the folded ears (31A) is bent toward each other and encloses the plug-in gap (b1).

7. The battery cell (100) according to any one of claims 1 to 6, characterized in that: A clamping portion (K) is provided on the end cover (10) or the first adapter plate (40), and the clamping portion (K) clamps the second adapter plate (50).

8. The battery cell (100) according to claim 7, characterized in that: The second adapter plate (50) comprises a first section (51) and a second section (52) adjacently arranged in a first direction (X) intersecting the height direction (Z); the first section (51) is connected to the first adapter plate (40) and is engaged with the engaging portion (K); the second section (52) is engaged with the engaging portion (31b) on the tab (31); The first section (51) and the second section (52) jointly form a stepped surface (m3) facing the first surface (m1), and the second section (52) is arranged closer to the first surface (m1) than the first section (51), and the clamping portion (K) is partially accommodated in the stepped space formed by the stepped surface (m3) and abuts against the stepped surface (m3) in the first direction (X).

9. The battery cell (100) according to claim 8, characterized in that: The end cover (10) includes a plastic part (11) located on the inner side thereof, and the pole assembly (20) passes through the plastic part (11) and is connected to the first adapter plate (40); The clamping portion (K) includes a pair of clamping ears (11a), and the two pairs of clamping ears (11a) are spaced apart in the second direction (Y) to form a clamping space for clamping the first adapter plate (40) and the second adapter plate (50); the first direction (X), the second direction (Y) and the height direction (Z) are not coplanar and intersect with each other.

10. A battery, characterized in that: Comprising the battery cell (100) according to any one of claims 1 to 9.

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