Battery monomer, battery and electric device

Abstract

The invention relates to a battery monomer. The battery monomer comprises a shell, a battery cell, a top cover assembly and a tab supporting piece, the tab supporting piece is used for supporting a tab bundle of the battery cell, the main body connecting part of the tab bundle is pressed on the end surface of the battery cell main body by the supporting main body, and the convex part is propped against the bent part of the tab bundle. The lug boss obliquely extends towards the top cover assembly, so that the lug boss can provide obliquely upward supporting force for the lug bundle while opening the lug bundle outwards, and the lug bundle is lifted upwards. And moreover, the surface of the convex part is attached to the inner side of the bent part, so that the contact surface between the convex part and the bent part can be increased, and the convex part has better opening and lifting effects on the bent part. Therefore, the tab supporting piece can provide relatively strong support and constraint for the tab bundle, and can effectively prevent the tabs in the tab bundle from collapsing and loosening, so that the stability of the tabs is improved. In addition, the invention also provides a battery and an electric device.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] When assembling battery cells, it is necessary to weld the tab bundle of the battery cell to the pole or adapter on the top cover and bend the tab bundle. As the market's requirements for battery performance become higher and higher, in order to meet the needs of reducing DC internal resistance, improving current capacity, and reducing temperature rise, the relevant technology proposes a solution of setting two tabs on the edge of each circle of pole pieces of the battery cell. Increasing the number of tabs can significantly improve battery performance, but it will also cause the thickness of the battery cell tab bundle to increase significantly. In this way, when the tab bundle is bent, the bending arc of the inner tab will be larger, making the inner tab easy to collapse. Moreover, due to the huge difference in the degree of bending of the inner and outer tabs, the mutual constraints between the tabs are weak and they are prone to looseness. Loose or collapsed tabs are very easy to be inserted into the battery cell and cause short circuits, and are easily torn due to working conditions such as bumps and impacts. Summary of the invention

[0003] Based on this, it is necessary to provide a battery cell, a battery and an electrical device that can improve the stability of the tab to address the above problems.

[0004] On the one hand, the present application provides a battery cell, comprising a shell, a battery cell and a top cover assembly, the battery cell comprising a battery cell body and a tab bundle extending from the end face of the battery cell body, the tab bundle forming a main body connecting portion, a top cover connecting portion and a bending portion connecting the main body connecting portion and the top cover connecting portion, the battery cell also comprises a tab support arranged between the top cover assembly and the battery cell body, the tab support comprising a supporting body and a protruding portion extending obliquely from the end of the supporting body toward the top cover assembly, the supporting body presses the main body connecting portion against the end face of the battery cell body, the protruding portion abuts against the inner side of the bending portion, and the surface of the protruding portion is an arc surface and fits against the inner side of the bending portion.

[0005] In one embodiment, the bottom surface of the support body facing the main body connecting portion is a plane.

[0006] In one embodiment, the bottom surface of the support body facing the main body connecting portion is an inclined arc surface, and the bottom surface is consistent with the inclination direction of the main body connecting portion and fits with the inner side of the main body connecting portion.

[0007] In one of the embodiments, the protrusion is inclined toward the top cover assembly at an angle of 10° to 70°.

[0008] In one of the embodiments, the protrusion is inclined toward the top cover assembly at an angle of 40° to 60°.

[0009] In one of the embodiments, the top cover assembly includes a top cover sheet and a lower insulating member, the lower insulating member is arranged on a side of the top cover sheet facing the battery cell, and the tab support is connected to the lower insulating member.

[0010] In one of the embodiments, one end of the pole lug support is rotatably connected to the lower insulating member so that the pole lug support can be flipped relative to the lower insulating member and switched between an expanded state and an installed state. The pole lug support in the expanded state is located outside the range of the top cover sheet, and the pole lug support in the installed state is located between the top cover assembly and the battery cell body.

[0011] In one embodiment, the protrusions extend from both ends of the support body along the width direction, the tab support is located between the two oppositely disposed tab bundles, and the protrusions at both ends respectively abut against the bent portions of the two oppositely disposed tab bundles.

[0012] In one embodiment, the total dimension of the tab support along the width direction is W1, the dimension of the support body along the width direction is W2, and the ratio of W1 / W2 is between 1.07 and 1.4.

[0013] In one embodiment, the ratio of W1 / W2 is between 1.15 and 1.35.

[0014] In one of the embodiments, a reinforcing rib is formed on the top surface of the support body facing away from the battery core, and the reinforcing rib extends along the width direction of the support body to the protrusions at both ends.

[0015] In one of the embodiments, in the length direction of the support body, the total width of the reinforcing ribs is greater than the width of the tab bundle.

[0016] In one of the embodiments, the protrusions extend from both ends of the support body along the width direction, two battery cells are arranged side by side in the shell, and the tab bundles of the two battery cells are bent toward each other, the tab support is located between the tab bundles of the two battery cells, and the protrusions at both ends are respectively abutted against the bent portions of the tab bundles of the two battery cells.

[0017] In one embodiment, each of the battery cells includes a positive electrode tab bundle and a negative electrode tab bundle, and two tab supports are provided, and one tab support is located between the positive electrode tab bundles of the two battery cells, and the other tab support is located between the negative electrode tab bundles of the two battery cells.

[0018] In one of the embodiments, a protruding plug-in portion is formed on the bottom surface of the support body facing the battery cell body, and the plug-in portion is inserted between the two battery cells.

[0019] In one embodiment, the side surface of the plug-in portion facing the two battery cells is an arc-shaped inclined surface.

[0020] In the above-mentioned battery cell, the tab support is used to support the tab bundle of the battery cell. The supporting body presses the main connecting part of the tab bundle against the end face of the battery cell body, and the protrusion abuts against the bent portion of the tab bundle. Since the protrusion extends obliquely toward the top cover assembly, the protrusion can not only support the tab bundle outward, but also provide an oblique upward support force to the tab bundle, thereby pulling the tab bundle upward. Moreover, the surface of the protrusion fits the inner side of the bent portion, which can increase the contact surface between the two, so the protrusion has a better effect of supporting and lifting the bent portion. It can be seen that the tab support can provide strong support and constraint to the tab bundle, and can effectively prevent the tabs therein from collapsing and loosening, thereby improving the stability of the tabs.

[0021] On the other hand, the present application also provides a battery, comprising a plurality of battery cells as described in any one of the above preferred embodiments.

[0022] In addition, the present application also provides an electrical device, comprising a plurality of battery cells as described in any one of the preferred embodiments or a battery as described in the above preferred embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a partial structural schematic diagram of a battery cell in the first embodiment of the present invention;

[0025] Figure 2 for Figure 1 An enlarged schematic diagram of a local A in the battery cell shown;

[0026] Figure 3 for Figure 1 A schematic diagram of the structure of a tab support in a battery cell shown;

[0027] Figure 4 It is a schematic structural diagram of a tab support member in another embodiment of the present invention;

[0028] Figure 5for Figure 1 A schematic diagram of the structure of the top cover assembly in the battery cell shown;

[0029] Figure 6 A partial structural schematic diagram of a battery cell in a second embodiment of the present invention;

[0030] Figure 7 for Figure 6 A schematic diagram of the structure of a tab support in a battery cell shown;

[0031] Figure 8 A partial structural schematic diagram of a battery cell in a third embodiment of the present invention;

[0032] Fig. 9 for Figure 8 A schematic diagram of the structure of the tab support in the battery cell shown. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like 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 invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may 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. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] It should be noted that 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 a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0039] See also Figures 1 to 9 The present invention provides a battery cell 10. In addition, the present invention also provides a battery and an electrical device.

[0040] The above-mentioned electrical device includes the above-mentioned battery or the above-mentioned battery cell 10, and can be provided with electrical energy by the above-mentioned battery or the above-mentioned battery cell 10. Among them, the above-mentioned electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, an energy storage device, an amusement equipment, an elevator and a lifting device, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys or electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric 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 carousels, jumping machines, etc.

[0041] The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. For new energy vehicles, the above-mentioned battery can be used as a driving power source to replace fossil fuels to provide driving power. This application does not impose any special restrictions on the above-mentioned electrical devices.

[0042] The above-mentioned battery can be a battery pack or a battery module. When the above-mentioned battery is a battery pack, the battery pack specifically includes a battery management system (BMS) and a plurality of the above-mentioned battery cells 10. The plurality of battery cells 10 can be electrically connected in series, in parallel, or in a mixture of series and parallel, and communicated with the battery management system to form a battery pack, and the battery management system controls and monitors the working status of each battery cell 10. In addition, the plurality of battery cells 10 can also be first connected in series and / or in parallel, and form a battery module with the module management system, and then the plurality of battery modules are electrically connected in series, in parallel, or in a mixture of series and parallel, and together with the battery management system, form a battery pack.

[0043] The multiple battery cells 10 in the battery can be installed on a supporting structure such as a box, a frame, a bracket, etc., and the battery cells 10 and the battery management system can be electrically connected through a busbar. The battery cell 10 can be a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, and its outer contour can be a flat body, a rectangular parallelepiped, or other shapes, but are not limited thereto. Specifically in this embodiment, the battery cell 10 is a lithium-ion square shell battery.

[0044] See also Figure 1 , Figure 2 and Figure 3 In one embodiment of the present invention, a battery cell 10 includes a housing (not shown), a battery cell 200 , a top cover assembly 300 and a tab support 100 .

[0045] The shell can be formed of metal materials such as aluminum, aluminum alloy, stainless steel, etc., and has a receiving space inside, which can accommodate other components such as the battery cell 200, electrolyte, and the tab support 100. In addition, at least one end of the shell is provided with an opening, and the battery cell 200 can be loaded into the shell through the opening. Since the battery cell 10 in this embodiment is a square battery, the outer contour of the shell is a cuboid, and its opening is rectangular.

[0046] The top cover assembly 300 is installed on the housing and covers its opening, thereby forming a relatively closed environment inside the housing to isolate the battery cell 200 from the external environment. Since the shape of the top cover assembly 300 needs to match the shape of the opening of the housing, the top cover assembly 300 is generally rectangular. Specifically, in this embodiment, the top cover assembly 300 includes a top cover sheet 310 and a lower insulating member 320 (see FIG. Figure 5), the lower insulating member 320 is disposed on a side of the top cover sheet 310 facing the battery cell 200.

[0047] The top cover sheet 310 can be formed of a material with high mechanical strength, such as aluminum, aluminum alloy or stainless steel, and is generally fixed to the opening of the shell by welding. The top cover sheet 310 has an outer surface and an inner surface that are arranged opposite to each other. The inner surface refers to the surface of the top cover sheet 310 facing the inside of the shell, and the outer surface refers to the surface of the top cover sheet 310 facing away from the inside of the shell. The lower insulating member 320 is arranged on the inner surface of the top cover sheet 310 and can be injection molded to play the role of forming insulation between the top cover sheet 310 and the battery cell 200.

[0048] In addition, the top cover assembly 300 also includes a pole 330 (see Figure 5 ). The top cover sheet 310 is provided with a pole hole (not shown), and the pole 330 is installed in the pole hole and insulated from the top cover sheet 310. The lower insulating member 320 is also provided with a avoidance hole (not shown) at the position corresponding to the pole hole to expose the pole 330, so as to facilitate welding the pole 330 with the pole lug of the battery cell 200. The pole 330 can be directly welded with the pole lug of the battery cell 200, or it can be welded with the pole lug of the battery cell 200 through a transfer sheet (not shown).

[0049] In view of the situation that the negative and positive tabs of the battery cell 200 are arranged at the same end, the top cover assembly 300 is provided with two poles 330. The two poles 330 can be welded to the negative and positive tabs of the battery cell 200, respectively, to serve as the negative and positive electrodes of the battery cell 10, respectively. Furthermore, the pole 330 as the positive electrode can be an aluminum component, which can improve the welding effect with the positive tab because it is made of the same material as the positive tab of the battery cell 200 and the positive electrode adapter. The pole 120 as the negative electrode can be a copper component, which can improve the welding effect with the negative tab because it is made of the same material as the negative tab of the battery cell 200 and the negative electrode adapter.

[0050] The battery cell 200 is the core component of the battery cell 10, and is generally formed by winding at least two mutually stacked pole pieces and a diaphragm separating the pole pieces for a preset number of turns. In order to adapt to the shape of the shell, the wound battery cell 200 is pressed into a flat shape. Among them, the edge of each circle of pole pieces of the battery cell 200 extends outward with a pole ear. The main part of the pole piece constitutes the battery cell body 210, and the pole ears at the edge of each circle of pole pieces are stacked to form a pole ear bundle 220 led out from the end face of the battery cell body 210. During the assembly process of the battery cell 10, the pole ear bundle 220 is welded as a whole to the pole column 330 or the adapter sheet on the top cover assembly 300. In order to meet the requirements of reducing the DC internal resistance, improving the current capacity and reducing the temperature rise, two pole ears are generally set at the edge of each circle of pole pieces. In this way, the edge of each layer of pole pieces in the thickness direction of the battery cell 200 will extend the pole ear, resulting in a significant increase in the thickness of the pole ear bundle 220.

[0051] The pole pieces constituting the battery cell 200 include positive pole pieces and negative pole pieces. A positive pole ear extends from the edge of the positive pole piece, and a negative pole ear extends from the edge of the negative pole piece. The positive pole ears of each circle of positive pole pieces are stacked to form a positive pole ear bundle 220, and the negative pole ears of each circle of negative pole pieces are stacked to form a negative pole ear bundle 220. The positive pole ear bundle 220 and the negative pole ear bundle 220 are far away from each other and do not contact each other. In the case where the positive pole ear and the negative pole ear of the battery cell 200 are arranged at the same end, the positive pole ear bundle 220 and the negative pole ear bundle 220 are arranged at intervals along the width direction of the battery cell 200.

[0052] Furthermore, the tab bundle 220 is formed with a main body connection portion 220a, a top cover connection portion 220b and a bending portion 220c, wherein the bending portion 220c connects the main body connection portion 220a and the top cover connection portion 220b. The main body connection portion 220a refers to a section of the tab bundle 220 close to the battery cell body 210, the top cover connection portion 220b refers to a section connected to the pole 330 or the adapter sheet on the top cover assembly 300, and the bending portion 220c is located in the middle, so that the tab bundle 220 is bent into a U shape as a whole.

[0053] In this embodiment, two battery cells 200 are arranged side by side in the housing, and the tab bundles 220 of the two battery cells 200 are bent toward each other. That is, the tab bundles 220 of each battery cell 200 are bent toward the other battery cell 200. More specifically, the positive tab bundles 220 of the two battery cells 200 are arranged opposite to each other along the thickness direction of the battery cell 200, and the negative tab bundles 220 of the two battery cells 200 are arranged opposite to each other along the thickness direction of the battery cell 200.

[0054] Please refer again Figure 2 and Figure 3 The tab support 100 is disposed between the top cover assembly 300 and the battery body 210 to support the tab bundle 220. The tab support 100 includes a support body 110 and a protrusion 120 extending obliquely from the end of the support body 110 toward the top cover assembly 300. When the battery cell 10 is placed upright on a horizontal plane, the protrusion 120 extends obliquely upward from the end of the support body 110. The support body 110 and the protrusion 120 are generally an integrally formed structure, which can be formed of insulating materials such as plastics and resins.

[0055] Furthermore, the support body 110 presses the main body connection part 220a against the end surface of the battery cell body 210, and the protrusion 120 abuts against the inner side of the bent part 220c. The inner side of the bent part 220c refers to the side where the tab bundle 220 is concave during the bending process. Moreover, the surface of the protrusion 120 is a curved surface and fits against the inner side of the bent part 220c.

[0056] As mentioned above, due to the increase in the thickness of the tab bundle 220, the bending positions and degrees of the inner tabs and the outer tabs in the tab bundle 220 are different. The closer to the inner side, the higher the bending degree of the tab, so the side of the bent portion 220c close to the main body connecting portion 220a also extends obliquely toward the top cover assembly 300. In this way, the protrusion 120, which also extends obliquely toward the top cover assembly 200, can better match the inner shape of the bent portion 220c, and the arc surface of the protrusion 120 fits the inner side of the bent portion 220c, which can increase the contact surface between the two, so the protrusion 120 can better support the bent portion 220c.

[0057] Moreover, since the protrusion 120 extends obliquely upward from the end of the support body 110, the protrusion 120 can not only push the tab bundle 220 outward, but also provide an oblique upward support force to the tab bundle 220, thereby pulling the tab bundle 220 upward. It can be seen that the tab support 100 can provide strong support and restraint to the tab bundle 220, and can effectively prevent the tabs from collapsing and loosening, thereby improving the stability of the tabs and preventing safety hazards caused by inverted insertion of the tabs.

[0058] Specifically in the present embodiment, the angle at which the protrusion 120 is inclined toward the top cover assembly 300 is 10° to 70°. The inclination angle of the protrusion 120 refers to the angle between the tangent line of the surface of the protrusion 120 at the connection between the protrusion 120 and the supporting body 110 and the bottom surface of the main body connection portion 220a, that is, the angle α shown in the figure. Within the above-mentioned angle range, the protrusion 120 is better adapted to the bending portion 220c of the tab bundle 220, and will not cause damage to the tab. In addition, the end of the protrusion 120 can be made into an arc shape to avoid cutting the tab. Preferably, the angle at which the protrusion 120 is inclined toward the top cover assembly 300 is 40° to 60°.

[0059] In this embodiment, protrusions 120 extend from both ends of the support body 110 along the width direction. The tab support 100 is located between two opposite tab bundles 220 , and the protrusions 120 at both ends abut against the bent portions 220 c of the two opposite tab bundles 220 .

[0060] Specifically, the tab support 100 can be disposed between the positive tab bundle 220 and the negative tab bundle 220 of the same battery cell 200, or between the tab bundles 220 of two battery cells 200. In this way, one tab support 100 can support two tab bundles 220 at the same time, and the tab bundles 220 on both sides can clamp and limit the tab support 100, and can also improve the stability of the assembly of the tab support 100.

[0061] Further, in this embodiment, the tab support 100 is located between the tab bundles 220 of the two battery cells 200. More specifically, two tab supports 100 are provided, and one tab support 100 is located between the positive tab bundles 220 of the two battery cells 200, and the other tab support 100 is located between the negative tab bundles 220 of the two battery cells 200.

[0062] The two tab supports 100 are installed separately, and the requirements for assembly accuracy are relatively low. Moreover, the size of a single tab support 100 is also relatively small, which is convenient for completing the installation operation in a small space. Of course, in other embodiments, a single tab support 100 can also be provided to simultaneously support the positive tab bundle 220 and the negative tab bundle 220 of the two battery cells 200, as long as the length of the single tab support 100 is sufficient and can extend to the area where the positive tab bundle 220 and the negative tab bundle 220 are located.

[0063] Furthermore, in this embodiment, the total dimension of the tab support 100 along the width direction is W1, the dimension of the support body 110 along the width direction is W2, and the ratio of W1 / W2 is between 1.07 and 1.4.

[0064] If W1 / W2 is greater than 1.4, it means that the length of the protrusion 120 extending from the end of the support body 110 is too short, so the inclined section of the protrusion 120 is too short, and it cannot fit the bent portion 220c well; if W1 / W2 is less than 1.07, it means that the length of the protrusion 120 extending from the end of the support body 110 is too long, and the length of the support body 110 is too short, and the pressing effect on the root of the outer tab of the tab bundle 220 is poor, which makes this part of the tab easy to be inserted upside down and torn. Therefore, when the ratio of W1 / W2 is set in the above range, it is beneficial to improve the support effect of the tab support 100 on the tab. Preferably, the ratio of W1 / W2 is between 1.15 and 1.35.

[0065] Please refer again Figure 3 and Figure 5 In this embodiment, a reinforcing rib 130 is formed on the top surface of the support body 110 facing away from the battery cell 200, and the reinforcing rib 130 extends along the width direction of the support body 110 to the protrusions 120 at both ends. The reinforcing rib 130 can increase the overall structural strength of the tab support 100, prevent the edge of the tab support 100 from being deformed due to the pulling force applied by the tab bundle 220 to both ends of the tab support 100 after the battery cell 200 is placed in the shell, and improve the reliability of the tab support 100.

[0066] Furthermore, in the length direction of the support body 110 , the total width of the reinforcing ribs 130 is greater than the width of the tab bundle 220 .

[0067] The reinforcing ribs 130 may be a plurality of ribs spaced apart along the length direction of the supporting body 110, or may be rib plates extending along the length direction of the supporting body 110. Figure 5 As shown in the example, for the case of multiple ribs, the width of the reinforcing rib 130 refers to the distance between the outer edges of the two outermost ribs on the left and right. For the case of a rib plate, the width of the reinforcing rib 130 refers to the size of the rib plate along the length direction of the support body 110. Such a configuration can ensure that the contact between the tab support 100 and the tab bundle 220 has a higher strength, further improving the reliability of the tab support 100.

[0068] In addition, in this embodiment, the tab support 100 is connected to the lower insulating member 320. Since the lower insulating member 320 is also formed of an insulating material, the lower insulating member 320 can be integrally formed with the tab support 100. Of course, the lower insulating member 320 and the tab support 100 can also be formed separately and then connected by bonding, clamping or plugging.

[0069] On the one hand, the connection between the tab support 100 and the lower insulating member 320 can improve the stability of the tab support 100 and effectively prevent the tab support 100 from being displaced. On the other hand, the tab support 100 can be assembled synchronously with the top cover assembly 300, and the tab support 100 can be prevented from being missed during the assembly process. Moreover, the tab support 100 and the top cover assembly 300 are pre-assembled, and the relative positions of the two are fixed, so the assembly error of the tab support 100 can be reduced during the assembly process of the battery cell 10.

[0070] Furthermore, in the present embodiment, one end of the tab support 100 can be rotatably connected to the lower insulating member 320, so that the tab support 100 can be flipped relative to the lower insulating member 320 and switched between the unfolded state and the installed state. The tab support 100 in the unfolded state is located outside the range of the top cover sheet 310, and the tab support 100 in the installed state is located between the top cover assembly 300 and the battery cell body 210.

[0071] During the assembly of the battery cell 10, the tab support 100 can be switched to the unfolded state first, thereby freeing up space below the top cover sheet 310 to prevent the tab support 100 from interfering with the welding and bending operations of the tab bundle 220. After the welding and bending operations of the tab bundle 220 are completed, the tab support 100 can be switched to the installed state to support the tab bundle 220.

[0072] Please refer again Figure 3 In this embodiment, the bottom surface of the support body 110 facing the main body connecting portion 220a is a plane. In another embodiment, for example Figure 6 and Figure 7 The second embodiment shown and Figure 8 and Fig. 9 In the third embodiment shown, the bottom surface of the support body 110 facing the main body connection portion 220a is an inclined arc surface, and the bottom surface is consistent with the inclination direction of the main body connection portion 220a and fits with the inner side of the main body connection portion 220a.

[0073] After the tab bundle 220 is bent, the inner surface of the main body connecting portion 220a is also tilted upward. Therefore, setting the bottom surface of the support body 110 as an inclined arc surface can make the support body 110 fit better with the inner side of the main body connecting portion 220a, so as to better press the inner tab of the tab bundle 220 against the end surface of the battery body 210 to prevent the tab from loosening.

[0074] Furthermore, in some embodiments, a protruding inserting portion 140 is formed on the bottom surface of the support body 110 facing the battery cell body 210 , and the inserting portion 140 is inserted between the two battery cells 200 .

[0075] The bottom surface of the support body 110 provided with the plug-in portion 140 may be a plane (eg Figure 4 ), or it can be a curved surface (such as Fig. 9 ). The plug-in portion 140 is inserted into the gap between the two battery cells 200, and the stability of the tab support 100 can be further improved by the limiting effect of the two battery cells 200. Moreover, the plug-in portion 140 facing the two sides of the battery cell 200 can also press the innermost tabs of the tab bundles 220 on both sides from the root, which can further prevent the tabs from loosening.

[0076] Furthermore, in this embodiment, the side of the plug-in portion 140 facing the two battery cells 200 is an arc-shaped inclined surface. The arc-shaped inclined surface can better fit the inner tabs of the tab bundle 220, and the pressing effect on the inner tabs is better. Moreover, the arc-shaped inclined surface is smooth, and it can also avoid damaging the battery cells 200. In order to avoid poking the battery cells 200, the end of the plug-in portion 140 is also set to be arc-shaped.

[0077] In the battery cell 10, the tab support 100 is used to support the tab bundle 220 of the battery cell 200. The support body 110 presses the main connecting portion 220a of the tab bundle 220 against the end surface of the battery cell body 210, and the protrusion 120 abuts against the bent portion 220c of the tab bundle 220. Since the protrusion 120 extends obliquely toward the top cover assembly 300, the protrusion 120 can not only open the tab bundle 220 outward, but also provide an oblique upward support force to the tab bundle 220, thereby pulling the tab bundle 220 upward. Moreover, the surface of the protrusion 120 fits the inner side of the bent portion 220c, which can increase the contact surface between the two, so the protrusion 120 has a better effect of opening and pulling the bent portion 220c. It can be seen that the tab support 100 can provide strong support and restraint to the tab bundle 220 , and can effectively prevent the tabs therein from collapsing and becoming loose, thereby improving the stability of the tabs.

[0078] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0079] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A battery cell, comprising a shell, a battery cell and a top cover assembly, characterized in that: The battery cell includes a battery cell body and a tab bundle extending from the end face of the battery cell body, the tab bundle is formed with a main body connecting portion, a top cover connecting portion and a bending portion connecting the main body connecting portion and the top cover connecting portion, the battery cell also includes a tab support member arranged between the top cover assembly and the battery cell body, the tab support member includes a support body and a protrusion extending obliquely from the end of the support body toward the top cover assembly, the support body presses the main body connecting portion against the end face of the battery cell body, the protrusion abuts against the inner side of the bending portion, and the surface of the protrusion is an arc surface and fits against the inner side of the bending portion.

2. The battery cell according to claim 1, characterized in that: The bottom surface of the supporting body facing the main body connecting portion is a plane.

3. The battery cell according to claim 1, characterized in that: The bottom surface of the support body facing the main body connecting portion is an inclined arc surface, and the bottom surface is consistent with the inclination direction of the main body connecting portion and fits with the inner side of the main body connecting portion.

4. The battery cell according to claim 1, characterized in that: The protrusion is inclined toward the top cover assembly at an angle of 10° to 70°.

5. The battery cell according to claim 4, characterized in that: The protrusion is inclined toward the top cover assembly at an angle of 40° to 60°.

6. The battery cell according to claim 1, characterized in that: The top cover assembly comprises a top cover sheet and a lower insulating member, wherein the lower insulating member is arranged on a side of the top cover sheet facing the battery core, and the tab support member is connected to the lower insulating member.

7. The battery cell according to claim 6, characterized in that: One end of the pole lug support can be rotatably connected to the lower insulating member so that the pole lug support can be flipped relative to the lower insulating member and switched between an expanded state and an installed state. The pole lug support in the expanded state is located outside the range of the top cover sheet, and the pole lug support in the installed state is located between the top cover assembly and the battery cell body.

8. The battery cell according to claim 1, characterized in that: The protrusions extend from both ends of the support body in the width direction, the tab support is located between the two oppositely disposed tab bundles, and the protrusions at both ends abut against the bent portions of the two oppositely disposed tab bundles respectively.

9. The battery cell according to claim 8, characterized in that: The total dimension of the tab support along the width direction is W1, the dimension of the support body along the width direction is W2, and the ratio of W1 / W2 is between 1.07 and 1.

4.

10. The battery cell according to claim 9, characterized in that: The ratio of W1 / W2 is between 1.15 and 1.

35.

11. The battery cell according to claim 8, characterized in that: A reinforcing rib is formed on the top surface of the support body facing away from the battery core, and the reinforcing rib extends along the width direction of the support body to the protrusions at both ends.

12. The battery cell according to claim 11, characterized in that: In the length direction of the support body, the total width of the reinforcing ribs is greater than the width of the tab bundle.

13. The battery cell according to any one of claims 1 to 12, characterized in that: The protrusions are extended from both ends of the support body along the width direction, two battery cells are arranged side by side in the shell, and the tab bundles of the two battery cells are bent toward each other, the tab support is located between the tab bundles of the two battery cells, and the protrusions at both ends are respectively abutted against the bent portions of the tab bundles of the two battery cells.

14. The battery cell according to claim 13, characterized in that: Each of the battery cells includes a positive electrode tab bundle and a negative electrode tab bundle. Two tab supports are provided, and one tab support is located between the positive electrode tab bundles of the two battery cells, and the other tab support is located between the negative electrode tab bundles of the two battery cells.

15. The battery cell according to claim 13, characterized in that: A protruding plug-in portion is formed on the bottom surface of the support body facing the battery core body, and the plug-in portion is inserted between the two battery cores.

16. The battery cell according to claim 15, characterized in that: The side surface of the plug-in portion facing the two battery cells is an arc-shaped inclined surface.

17. A battery, characterized in that: The battery comprises a plurality of battery cells as claimed in any one of claims 1 to 16.

18. An electrical device, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 16 or a battery according to claim 17.

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