Battery, battery device, electric equipment and tab forming device

Abstract

The invention provides a battery, a battery device, electric equipment and a tab forming device, and relates to the technical field of electric equipment.The battery comprises a battery cell assembly, the battery cell assembly comprises a battery cell and a tab, and the tab is located at one end of the battery cell and electrically connected with the battery cell; the lead-out sheet is provided with a first surface and a second surface which are opposite to each other, the second surface faces the battery cell, and the lead-out sheet is pressed on the tab and is connected with the tab; the pole is positioned on the first surface of the leading-out sheet and is connected with the leading-out sheet; the first insulating part is positioned on the first surface of the leading-out sheet; and the cover plate is arranged on the first insulating part in a covering manner, and the pole is arranged on the first insulating part and the cover plate in a penetrating manner. According to the battery provided by the invention, the interval between the lead-out sheet and the space ring can be eliminated, the supporting performance of the cover plate is improved, the probability that the shell of the battery deforms at the joint of the lead-out sheet and the tab under the action of external force is reduced, and the use safety of the battery and the use safety of electric equipment are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery, a battery device, an electrical device, and a tab forming device. Background Art

[0002] Lithium-ion batteries are commonly used in electrical equipment. For example, they can be used in battery cars as a power source for electric vehicles.

[0003] During the battery assembly process, the tabs of the battery cell are usually fixed with spacers, and the lead-out tabs, cover plates, pole posts and terminals are first assembled into an assembly. The tabs are then led out to the outside of the spacers so that the lead-out tabs and the part of the tabs that are led out of the spacers are welded. The welded tabs are then folded over and pressed into the spacers, and the battery cell, tabs, spacers, lead-out tabs and other components are installed in the shell through the connection between the cover plate and the shell.

[0004] However, the tab lead-out and spacer in the above-mentioned related technologies require a large space, with low space utilization, and the space support force is weak and easily deformed by external forces, affecting the safety of battery use and the safety of electrical equipment use. Summary of the Invention

[0005] The embodiments of the present application provide a battery, a battery device, an electrical equipment and a tab forming device, which require a large space for tab lead-out and spacers, have low space utilization, and the supporting force of the space is weak and easily deformed by external forces, affecting the safety of battery use and the safety of electrical equipment use. Technical problems.

[0006] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0007] A first aspect of an embodiment of the present application provides a battery, comprising:

[0008] A battery cell assembly, the battery cell assembly includes a battery cell and a tab, the tab is located at one end of the battery cell and is electrically connected to the battery cell; a lead-out plate, the lead-out plate has a first surface and a second surface relative to each other, the second surface faces the battery cell, and the lead-out plate is pressed onto the tab and connected to the tab; a pole, the pole is located on the first surface of the lead-out plate and connected to the lead-out plate; a first insulating member, the first insulating member is located on the first surface of the lead-out member; a cover plate, the cover plate is covered on the first insulating member, and the pole is passed through the first insulating member and the cover plate.

[0009] The battery provided by the embodiment of the present application, by setting the first insulating member on the first surface of the lead-out piece, and setting the cover plate on the first insulating member, the second surface of the lead-out piece is pressed on the tab and electrically connected to the tab, and the second surface of the lead-out piece presses the tab against the surface of the tab on the battery cell, thereby eliminating the gap between the lead-out piece and the spacer in the height direction of the battery cell, and also eliminating the gap between the lead-out piece and the surface of the tab on the battery cell, thereby avoiding the problem that the shell is easily deformed by external force at the gap due to the gap between the lead-out piece and the spacer, thereby improving the safety of the battery and the safety of the electrical equipment. In addition, since the solution of the embodiment of the present application can fix the tab without using a spacer, the manufacturing cost of the battery can be reduced.

[0010] In addition, since the solution of the embodiment of the present application eliminates the gap between the lead-out plate and the spacer in the height direction of the battery cell, the space utilization inside the shell can be improved. When the battery specifications are the same, the shell can accommodate larger battery cells, thereby increasing the battery capacity.

[0011] Based on the above technical solution, this application can also be improved as follows.

[0012] In a possible implementation, at least a portion of the tab is inserted into the lead-out piece so that the lead-out piece is pressed onto the tab.

[0013] In this way, the lead-out tab can be pressed onto the electrode tab, and at least part of the electrode tab can be inserted into the lead-out tab, which can further increase the contact area between the electrode tab and the lead-out tab, reduce the contact resistance between the electrode tab and the lead-out tab, thereby reducing power loss and improving the overall energy efficiency of the battery.

[0014] In a possible implementation, the second surface has at least one channel, and the tab is inserted into the channel.

[0015] In this way, by providing a plurality of channels on the lead-out sheet, it is possible to facilitate the insertion of the tab into the lead-out sheet, facilitate the connection between the lead-out sheet and the tab, and improve the assembly efficiency of the battery.

[0016] In one possible implementation, along the length direction of the lead-out piece, the lead-out piece has a first end and a second end; the two ends of the channel extend to the end surfaces of the first end and the second end respectively along the length direction of the lead-out piece; in the length direction of the lead-out piece, the channel includes a gathering section and a clamping section that are connected, and the channel width of the clamping section is smaller than the channel width of the gathering section.

[0017] In this way, by making the channel width of the gathering section larger than the channel width of the clamping section, it is convenient to gather the multiple foils located at one end of the battery cell into the channel through the gathering section, and further facilitate the multiple foils gathered in the channel to be tightly pressed together through the clamping section to form a pole ear, so that the foil can be directly formed into a pole ear by using the lead-out sheet, enriching the function of the lead-out sheet, and avoiding the use of additional tools for forming the pole ear, thereby improving the assembly efficiency of the battery.

[0018] In a possible implementation, the channel width of the gathering section gradually decreases in a direction from the gathering section to the clamping section.

[0019] In this way, by gradually reducing the channel width of the gathering section from the gathering section to the clamping section, it is possible to facilitate the multiple foils entering the gathering channel to gradually approach each other before entering the clamping section, and facilitate the multiple foils after gathering to enter the channel of the clamping section, which is convenient for the forming of the tab and the clamping of the tab by the lead-out sheet.

[0020] In a possible implementation, along the width direction of the lead-out piece, two opposite inner side walls of the channel are both planes.

[0021] In this way, by making the two opposite inner side walls of the channel flat along the thickness direction of the lead-out plate, the movement of the tab in the channel can be facilitated during the relative sliding of the lead-out plate and the tab, which helps to improve the assembly and connection efficiency between the tab and the lead-out plate.

[0022] The two opposite inner side walls of the channel are both curved surfaces.

[0023] In this way, by increasing the contact area between the two opposite inner walls of the channel and the tab, and because the inner wall of the channel is a curved surface, the friction resistance between the tab and the inner wall of the channel can be increased, thereby improving the connection stability between the tab and the lead sheet.

[0024] In a possible implementation, along the thickness direction of the lead-out tab, the height of the tab is smaller than the thickness of the lead-out tab.

[0025] In this way, by making the tab height smaller than the thickness of the lead sheet in the thickness direction of the lead sheet, if the channel is connected in the thickness direction of the lead sheet, the tab can be prevented from extending outside the channel in the thickness direction of the lead sheet, thereby preventing the tab extending outside the channel from affecting the connection between the first insulating member and the lead sheet. If the channel is closed on the side of the lead sheet facing away from the battery cell, it can prevent the foil from being too long and unable to enter the channel during the lead sheet-to-tab forming process.

[0026] In a possible implementation, the channel partially penetrates the lead-out piece in the thickness direction of the lead-out piece, so as to weld the electrode tab inserted in the channel to the lead-out piece on the surface of the lead-out piece facing away from the electrode tab.

[0027] In a possible implementation, the tab is in a folded state, the second surface of the lead-out piece is pressed and adhered to one surface of the tab, and the other surface of the tab is connected to the battery core.

[0028] In this way, by folding the tab, the second side of the lead-out tab is pressed against and fits one side of the tab, and the other side of the tab is connected to the battery cell, it is possible to use a lead-out tab with a thickness less than the length of the tab to electrically connect the tab to the tab, thereby reducing the thickness of the lead-out tab, and further reducing the space occupied by the lead-out tab in the internal space of the shell, thereby improving the utilization rate of the internal space of the shell, and under the condition that the battery specifications are the same, the shell can accommodate a larger volume of battery cells, thereby increasing the capacity of the battery.

[0029] In a possible implementation, there are a plurality of tabs. When the tabs are in a folded state, the tabs have the same folding direction, and the tabs are arranged at intervals after folding.

[0030] In this way, by providing multiple tabs, the contact area between the tabs and the lead-out tabs can be increased, thereby reducing the contact resistance between the tabs and the lead-out tabs, thereby reducing power loss and improving the overall energy efficiency of the battery.

[0031] In one possible implementation, the width of the tab in the folded state is h1, the thickness of the battery cell is W1, the number of tabs is n1, the width of the tab is h1, the thickness of the battery cell is W1, and n1 satisfies: h1≤W1 / n1.

[0032] By ensuring that n1 satisfies the condition h1 ≤ W1 / n1, the number of tabs can be increased with the thickness of the cell, ensuring a greater contact area between the tabs and the lead tabs as the cell thickness increases. This prevents the tabs near the thickness edge of the cell from extending outside the cell after folding due to excessive tab width.

[0033] In one possible implementation, there are multiple pole tabs, including a first pole tab and a second pole tab; the first pole tab and the second pole tab have opposite folding directions; there is a gap between one of the first pole tab and the second pole tab when in a folded state, and a portion of the other of the first pole tab and the second pole tab is located within the gap; the second surface of the lead-out piece is bonded and connected to a portion of the surface of the first pole tab or the second pole tab, and the portion of the surface of the first pole tab and the portion of the surface of the second pole tab are both connected to the battery cell.

[0034] In this way, compared with the situation where one side of the tab between the lead-out tab and the battery cell is connected to the lead-out tab and the other side of the tab is electrically connected to the battery cell, the thickness of the stacked structure formed after the first tab and the second tab are folded is increased. When the lead-out tab and the tab are welded using laser penetration welding, the probability of the first tab and the second tab being welded through can be reduced, thereby improving the weldability between the lead-out tab and the tab.

[0035] In one possible implementation, the width of the first electrode tab or the second electrode tab in the folded state is h2, the thickness of the battery cell is W2, the number of the electrode tabs is n2, and h2, W2, and n2 satisfy: h2≤2W2 / n2.

[0036] In this way, by ensuring that n1 satisfies the condition h2 ≤ W2 / n2, the number of tabs can be increased with the thickness of the cell, thereby ensuring a greater contact area between the tabs and the lead tabs as the cell thickness increases. This can also prevent the tabs near the thickness edge of the cell from extending outside the cell after folding due to the first or second tab being too wide.

[0037] In a possible implementation, the length of the lead-out piece is smaller than the width of the battery cell.

[0038] In this way, by making the length of the lead-out tab smaller than the width of the battery cell, the injection hole can be staggered with the lead-out tab in the thickness direction of the lead-out tab, which facilitates the injection of liquid into the battery cell and avoids the injection process affecting the lead-out tab, thereby improving the rationality of the layout between the various structures inside the battery.

[0039] In a possible implementation, the first insulating member has a mounting groove on a side facing the lead-out piece; the lead-out piece is disposed in the mounting groove; a first through hole is formed on a bottom wall of the mounting groove, and the pole passes through the first through hole.

[0040] In this way, by setting a mounting groove on the first insulating part, the lead-out piece can be set in the mounting groove, so that the lead-out piece can be limited by the inner side wall of the mounting groove, thereby improving the connection stability between the first insulating part and the lead-out piece, and improving the installation stability of the lead-out piece in the shell, thereby improving the structural stability of the battery.

[0041] In a possible implementation, the pole and the lead-out piece are an integrated structure.

[0042] In this way, by providing the pole and the lead-out piece as an integrated structure, the connection stability between the pole and the lead-out piece can be improved, and the assembly process of the battery can be reduced, thereby improving the assembly efficiency of the battery.

[0043] In one possible implementation, the battery further includes a terminal and a second insulating member; the cover plate is provided with a second through hole, and a portion of the pole passes through the second through hole; the terminal is arranged on the outside of the pole; the second insulating member is arranged between the outer wall of the terminal and the inner wall of the second through hole, and the second insulating member is used to insulate the terminal from the cover plate.

[0044] In this way, since the terminal and the cover plate are both metal parts, by arranging the second insulating part between the terminal and the inner wall of the second through hole, the terminal can abut against the inner wall of the through hole through the second insulating part, and insulation between the terminal and the cover plate can be achieved, thereby avoiding damage to the battery due to a short circuit between the terminal and the cover plate.

[0045] In one possible implementation, the battery further includes a sealing ring; the sealing ring is sleeved on the outside of the pole and disposed in the second through hole, and the terminal and the second insulating member are located on the side of the sealing ring facing away from the first insulating member; the sealing ring is used to seal the joint between the terminal and the first insulating member and to seal the joint between the second insulating member and the first insulating member.

[0046] In this way, by setting a sealing ring between the first insulating member and the terminal, the sealing between the terminal and the first insulating member can be achieved, reducing the probability of the liquid injected into the battery cell leaking from the joint between the first insulating member and the terminal. By setting a sealing ring between the second insulating member and the first insulating member, the probability of the liquid injected into the battery cell leaking from the joint between the first insulating member and the second insulating member can be reduced, thereby improving the sealing performance of the battery.

[0047] In one possible implementation, the sealing ring has a first sealing surface, a second sealing surface, and a third sealing surface located between the first sealing surface and the second sealing surface on the side facing the terminal; one end of the second insulating member abuts against the first sealing surface, one end of the terminal abuts against the second sealing surface and part of the outer side surface of the terminal is sealed with the third sealing surface; in the thickness direction of the cover plate, the first sealing surface is higher than the second sealing surface.

[0048] In this way, by making the end of the terminal facing the sealing ring abut against the second sealing surface and making the outer side surface of the terminal abut against the third sealing surface, the probability of the liquid in the battery cell diffusing from the joint between the terminal and the first insulating member to the second insulating member can be reduced, and the channel makes the end of the second insulating member facing the sealing ring abut against the first sealing surface, which can reduce the liquid leaked to the joint between the second insulating member and the sealing ring from leaking further toward between the second insulating member and the cover plate.

[0049] Furthermore, by making the first sealing surface higher than the second sealing surface, a multi-level seal can be formed between the terminal, the second insulating member and the first insulating member, thereby improving the sealing effect between the terminal, the second insulating member and the first insulating member.

[0050] In one possible implementation, the terminal has a first extension on the side facing the cover plate, and the first extension is arranged in the second through hole; the first extension is arranged on the periphery of the pole and is connected to the pole; the second insulating member has a second extension on the side facing the cover plate, the second extension is arranged in the second through hole, and the second extension is arranged on the periphery of the terminal.

[0051] In this way, the first extension portion on the terminal is arranged in the second through hole, and the second extension portion on the second insulating member is arranged on the outer periphery of the first extension portion, so that the second extension portion can insulate the first extension portion and the inner side wall of the second through hole on the cover plate, and the pole, the first extension portion, the second extension portion and the inner side wall of the second through hole can abut against each other, which can improve the connection stability and structural compactness between the pole, the terminal, the second insulating member and the cover plate.

[0052] In one possible implementation, the first extension portion has a third through hole, the inner side wall of the third through hole has a snap-fit structure, and the outer side wall of the pole has a slot that cooperates with the snap-fit structure; the pole passes through the third through hole, and the pole and the first extension portion are connected by the engagement of the slot and the snap-fit structure.

[0053] In this way, by setting a snap-fit structure on the inner wall of the third through hole and setting a snap-fit groove at a position corresponding to the snap-fit structure on the pole, the pole and the terminal can be connected through the snap-fit of the snap-fit structure and the snap-fit groove, avoiding the use of the existing technology in which the terminal is fixed to the outside of the terminal by deformation riveting under the action of external force, thereby improving the assembly efficiency between the terminal and the pole, and thus improving the assembly efficiency of the battery.

[0054] Furthermore, since the wall thickness of the first extension portion is smaller than that of other areas on the terminal, when the terminal is a metal part, the first extension portion can be elastically deformed to facilitate the snap-fitting structure to be snapped into the slot on the pole.

[0055] A second aspect of an embodiment of the present application provides a battery device comprising the battery described above.

[0056] A third aspect of an embodiment of the present application provides an electrical device, which includes an electrical device and a battery or battery device as described above, wherein the battery or the battery device is used to provide electrical energy to the electrical device.

[0057] In this way, by installing and using the above-mentioned battery, the electric device can reduce the probability of the battery being deformed and damaged indirectly due to external force collision, thereby improving the safety of the electric device.

[0058] When assembling batteries of the same size, compared with the prior art, electrical devices can obtain larger battery capacity and longer battery life by assembling the batteries provided in the above-mentioned embodiments of the present application.

[0059] A fourth aspect of an embodiment of the present application provides a tab forming device, which includes a forming component and a folding component connected to each other; the forming component is used to gather multiple foils on the battery cell to form a tab; the folding component is used to fold the tab into the folded state of the battery tab as described above.

[0060] In this way, before the lead-out tab in the above-mentioned battery is connected to the folded tab, the tab is folded by using a tab forming device, so that the foil on the battery cell can be gathered and formed into a tab by a forming component, and the formed tab is further folded using a folding component to facilitate folding the tab, which can simplify the dependence on manual operation, improve the tab forming efficiency, and thus improve the battery assembly efficiency.

[0061] In one possible implementation, the molding component includes at least one molding channel, and when multiple foils on the battery cell pass through the molding channel, the molding channel is used to gather the multiple foils to form the electrode ear; the folding component includes at least one folding channel, and each of the folding channels is connected to a molding channel; when the electrode ear passes through the folding channel, the folding channel is used to bend the electrode ear and put it into a folded state.

[0062] In this way, by sliding the multiple foils on the battery cell relative to the at least one forming channel on the forming member, the multiple foils are gathered and clamped by the forming channel to form the tab. This ensures that each foil is evenly gathered and compacted, thereby forming a more compact and solid tab and enhancing the mechanical strength of the tab. By evenly gathering the multiple foils, the resistance can be reduced, the current transmission efficiency can be increased, and the overall electrical performance of the battery cell can be improved.

[0063] If there are multiple molding channels, the size and shape of each tab can be ensured to be consistent, thereby improving the consistency and reliability of the battery cell and reducing the defective rate in production.

[0064] The formed tabs can be further folded through the multiple folding channels on the folding component to make the tabs in a folded state, thereby ensuring the mechanical strength of the folded tabs and the uniformity of the surface of the folded tabs, improving the current transmission efficiency, and improving the overall electrical performance of the battery cell.

[0065] In one possible implementation, the molding component includes a first molding channel and a second molding channel, the first molding channel is used to gather multiple foils on the battery cell to form a first pole lug, and the second molding channel is used to gather multiple foils on the battery cell to form a second pole lug; the folding component includes a first folding channel and a second folding channel, the first folding channel is connected to the first molding channel, and the second channel is connected to the second molding channel; when the first pole lug passes through the first folding channel, the first folding channel is used to fold the first pole lug toward the second pole lug; when the second pole lug passes through the second folding channel, the second folding channel is used to fold the second pole lug toward the folded first pole lug, and the folded second pole lug is partially overlapped on the first pole lug.

[0066] In this way, the first and second forming channels can be used to gather the multiple foils on the battery cell to form two first and second tabs of approximately identical size and shape, thereby improving the consistency and reliability of the battery cell. Furthermore, the first and second tabs are folded in opposite directions by the first and second folding channels on the folding member, and the second tab is partially superimposed on the first tab. This increases the total thickness of the tab between the lead tab and the battery cell, reduces the probability of the tab being welded through during laser penetration welding, and improves the weldability between the lead tab and the tab. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0068] Figure 1 A schematic structural diagram of a battery provided in an embodiment of the present application;

[0069] Figure 2 for Figure 1 A schematic diagram of the structure of the battery with the shell removed;

[0070] Figure 3 An exploded view of a local structure of a battery provided in an embodiment of the present application;

[0071] Figure 4 A schematic diagram of a partial structure of a battery provided in an embodiment of the present application;

[0072] Figure 5 for Figure 4 The cross-sectional view at AA in the schematic diagram of the local structure of the battery;

[0073] Figure 6 A schematic diagram of the structure of the lead-out tab and tab of the first battery provided in an embodiment of the present application;

[0074] Figure 7 A schematic diagram of the structure of the lead-out tab and tab of the second battery provided in an embodiment of the present application;

[0075] Figure 8 A schematic structural diagram of a tab forming device provided in an embodiment of the present application;

[0076] Figure 9 for Figure 8 A cross-sectional view of the gradual change of the folding channel along the direction from the forming channel to the folding channel;

[0077] Figure 10 A schematic diagram of the structure of the lead-out tab and tab of the third battery provided in an embodiment of the present application;

[0078] Figure 11 A schematic structural diagram of another tab forming device provided in an embodiment of the present application.

[0079] Description of reference numerals:

[0080] 10-battery; 11-side panel;

[0081] 100-battery cell assembly;

[0082] 110-battery cell; 120-tab;

[0083] 120a-first electrode tab; 120b-second electrode tab; 120c-spacer; 121-vertical portion;

[0084] 122-protuberance;

[0085] 200-lead-out piece;

[0086] 200a-first side; 200b-second side;

[0087] 210 - channel; 220 - first end; 230 - second end; 240 - gathering section; 250 - clamping section;

[0088] 260-lead-out member; 270-connecting member;

[0089] 300-pole;

[0090] 310-card slot;

[0091] 400-first insulating member;

[0092] 410 - mounting groove; 420 - first through hole; 430 - liquid injection hole;

[0093] 500-cover plate;

[0094] 510 - second through hole; 520 - second groove;

[0095] 600-terminal;

[0096] 610 - first extension portion; 620 - third through hole; 630 - snap-fit structure;

[0097] 700- second insulating member;

[0098] 710-second extension; 720-first groove;

[0099] 800-seal ring;

[0100] 810-first sealing surface; 820-second sealing surface; 830-third sealing surface;

[0101] 900-shell;

[0102] 20-tab forming device;

[0103] 21-forming member; 22-folding member; 21a-forming channel; 22a-folding channel;

[0104] 21b - first molding channel; 21c - second molding channel; 23 - molding piece; 24 - folding piece; 25 - connecting member. DETAILED DESCRIPTION

[0105] In the related art, the tabs of the battery are clamped and fixed by spacers to prevent the tabs from being deformed or damaged before being welded to the lead-out tabs. If protection is required by spacers, the spacers need to have a certain height to better protect the tabs, which will create a certain amount of accommodation space inside the spacers. The lead-out tabs, poles, terminals, and cover plates are assembled to form an assembly. Due to the welding process, the assembly cannot be directly welded to the tabs in the accommodation cavity. Therefore, the length of the tabs needs to be longer than the spacers. This allows a portion of the tabs to stretch outside the accommodation space, so that the outside of the spacers can be welded to the lead-out tabs on the assembly. After welding is completed, the assembly and the welded tabs are re-installed into the accommodation space.

[0106] Considering that an excessively long tab will increase manufacturing costs, the tab extending outside the accommodation space should not be too long. This requires that the height of the assembly installed in the accommodation space be lower than the height of the accommodation space, so that when the assembly is installed in the accommodation space of the spacer, a certain gap is formed between the lead-out tab and the bottom of the spacer. After the battery is assembled, the gap is located in the shell, and the shell corresponding to the gap is supported only by the abutment between the spacer and the cover plate. However, since the spacer is made of plastic material and has low structural strength, it has poor support for the cover plate and the battery shell. As a result, when the cover plate or the shell corresponding to the spacer is subjected to external force, the cover plate or the shell corresponding to the spacer is easily deformed due to insufficient support from the spacer, affecting the safety of the battery and the safety of the electrical equipment.

[0107] In response to the above technical problems, the embodiments of the present application provide a battery, a battery device, an electrical device and a tab forming device. The battery is formed by setting a first insulating member on the first surface of the lead-out piece and setting a cover plate on the first insulating member. The second surface of the lead-out piece is pressed on the tab and electrically connected to the tab. The second surface of the lead-out piece presses the tab against the surface of the tab on the battery cell. This can avoid the use of spacers to fix the tab, thereby eliminating the gap between the lead-out piece and the spacer in the height direction of the battery cell, and also eliminating the gap between the lead-out piece and the surface of the tab on the battery cell. This can avoid the problem that the shell is easily deformed by external force at the gap due to the gap between the lead-out piece and the spacer, thereby improving the safety of the battery and the safety of the electrical device. In addition, since the solution of the embodiment of the present application can fix the tab without using spacers, the manufacturing cost of the battery can be reduced.

[0108] In addition, since the solution of the embodiment of the present application eliminates the gap between the lead-out plate and the spacer in the height direction of the battery cell, the space utilization inside the shell can be improved. When the battery specifications are the same, the shell can accommodate larger battery cells, thereby increasing the battery capacity.

[0109] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0110] refer to Figures 1 to 3 The embodiment of the present application provides a battery 10, which may include a cell assembly 100, a lead-out tab 200, a terminal 300, a first insulating member 400, and a cover 500. The cover 500 may be connected to the housing 900 of the battery 10.

[0111] The battery cell assembly 100 may include a battery cell 110 and a tab 120. The tab 120 is located at one end of the battery cell 110 and is electrically connected to the battery cell 110. For example, the tab 120 may be located at one end in the height direction of the battery cell 110. The tab 120 may be the tab 120 of the anode of the battery cell 110 or the tab 120 of the cathode of the battery cell 110.

[0112] It is understood that the tab 120 can be formed by gathering together multiple foils located at the end of the battery cell 110 and electrically connected to the battery cell 110. The tab 120 formed by gathering the multiple foils can include two parts, one part being a vertical portion 121 and the other part being stacked to form a raised portion 122. The raised portion 122 is located between the vertical portion 121 and the battery cell 110, and the raised portion 122 can support the vertical portion 121.

[0113] refer to Figure 3 and Figure 4 , the lead-out piece 200 is in the thickness direction (such as Figure 3 The lead-out tab 200 may have a first surface 200 a and a second surface 200 b opposite to each other, with the second surface 200 b facing the battery cell 110 , and the lead-out tab 200 is pressed onto the tab 120 and connected to the tab 120 .

[0114] It can be understood that when the second side 200b of the lead-out piece 200 is pressed against the tab 120, the second side 200b of the lead-out piece 200 presses the tab 120 against the end face of the tab 120 on the battery cell 110, so that the second side 200b of the lead-out piece 200 and the end face of the tab 120 on the battery cell 110 jointly clamp the tab 120, eliminating the gap between the bottom of the spacer and the lead-out piece 200, and eliminating the gap between the sections of the tab 120 bent in the thickness direction of the lead-out piece 200.

[0115] In some embodiments, when the second surface 200b of the lead-out tab 200 is pressed onto the tab 120, the second surface 200b enables the vertical portion 121 of the tab 120 to be inserted into the lead-out tab 200, and enables the second surface 200b to be pressed onto the raised portion 122, so that the distance between the lead-out tab 200 and the end of the battery cell 110 is less than or equal to the height of the raised portion.

[0116] In other embodiments, the second surface 200b can be directly pressed onto a surface after the vertical portion 121 of the tab 120 is folded, so that the distance between the lead-out tab 200 and the end of the battery cell 110 is approximately equal to the thickness of at least one tab 120. Since the thickness of the tab 120 is relatively thin, the gap formed between the lead-out tab 200 and the end of the battery cell 110 is relatively small, and thus will not affect the support of the battery cell 110 for the lead-out tab 200 through the tab 120.

[0117] In other embodiments, the second surface 200b of the lead-out plate 200 can be pressed onto the raised portion 122 of the tab 120, and the vertical portion 121 of the tab 120 can extend from the outer peripheral side of the lead-out plate 200 to the first surface 200a, with a portion of the vertical portion 121 attached to the first surface 200a.

[0118] refer to Figure 3 、 Figure 4 and Figure 5 The terminal 300 is located on the first side 200a of the lead-out tab 200 and is connected to the lead-out tab 200. The first insulating member 400 is located on the first side 200a of the lead-out tab 200. The cover plate 500 is disposed on the first insulating member 400, and the terminal 300 is disposed through the first insulating member 400 and the cover plate 500. For example, one end of the terminal 300 passes through the first insulating member 400 and the cover plate 500 and is exposed at the cover plate 500. The first insulating member 400 can insulate the cover plate 500 from the lead-out tab 200, thereby preventing damage to the battery due to a short circuit between the lead-out tab 200 and the cover plate 500.

[0119] In the absence of a spacer, the lead-out tab 200, the first insulating member 400, and the cover plate 500 are stacked and connected in sequence, so the gap between the lead-out tab 200 and the battery cell 110 can be ignored. Therefore, the gap between the lead-out tab 200 and the spacer in the height direction of the battery cell 110 can be eliminated between the cover plate 500 and the end of the battery cell 110. When the battery is impacted, for example, when the battery is impacted from the cover plate 500 toward the battery cell 110, the battery cell 110 provides sufficient support to the cover plate 500 through the tab 120, the lead-out tab 200, and the first insulating member 400. This can avoid the problem of the housing 900 being easily deformed by external forces at the gap between the lead-out tab 200 and the spacer, thereby improving the safety of the battery and the safety of the electrical equipment.

[0120] Furthermore, the second surface 200b of the battery lead-out tab 200 presses the tab 120 against the surface of the battery cell 110 on which the tab 120 is provided, thereby eliminating the gap between the lead-out tab 200 and the spacer in the height direction of the battery cell 110, and also eliminating the gap between the lead-out tab 200 and the surface of the battery cell 110 on which the tab 120 is provided, thereby improving the space utilization inside the shell 900. Under the condition of the same battery specifications, the shell 900 can accommodate a battery cell 110 of a larger volume, thereby increasing the capacity of the battery.

[0121] refer to Figure 3 In some embodiments, the length of the lead-out tab 200 is smaller than the width of the battery cell 110. Thus, by making the length of the lead-out tab 200 smaller than the width of the battery cell 110, the injection hole 430 can be made to be located in the thickness direction of the lead-out tab 200 (e.g., Figure 3The lead-out tab 200 is staggered with each other, which facilitates the injection of liquid into the battery cell 110 and can avoid the injection process affecting the lead-out tab 200, thereby improving the rationality of the layout between the various structures inside the battery.

[0122] refer to Figure 3 In some embodiments, when the injection hole 430 is opened, the position of the injection hole 430 on the first insulating member 400 can be located in an area where the first insulating member 400 and the lead-out plate 200 do not overlap with each other in the thickness direction.

[0123] refer to Figure 3 and Figure 5 In some embodiments, the first insulating member 400 has a mounting groove 410 on a side facing the lead-out plate 200. The lead-out plate 200 is disposed in the mounting groove 410. A first through hole 420 is formed on the bottom wall of the mounting groove 410, and the pole 300 passes through the first through hole 420.

[0124] In this way, by setting the installation groove 410 on the first insulating part 400, the lead-out piece 200 can be set in the installation groove 410, so that the lead-out piece 200 can be limited by the inner side wall of the installation groove 410, thereby improving the connection stability between the first insulating part 400 and the lead-out piece 200, and improving the installation stability of the lead-out piece 200 in the shell 900, thereby improving the structural stability of the battery.

[0125] It is understandable that when the injection hole 430 is opened, the position of the injection hole 430 on the first insulating member 400 is located in the area outside the mounting groove 410, so as to avoid the liquid affecting the lead-out piece 200 in the mounting groove 410 when liquid is injected into the battery cell 110 through the injection hole 430.

[0126] refer to Figure 3 In some embodiments, the terminal 300 and the lead tab 200 are integrally formed. This improves the connection stability between the terminal 300 and the lead tab 200, reduces battery assembly steps, and improves battery assembly efficiency.

[0127] In some embodiments, the pole 300 and the lead tab 200 may be welded to form an integral structure, and the integral structure formed by the pole 300 and the lead tab 200 is used for welding to the tab 120 .

[0128] refer to Figure 3 and Figure 5In some embodiments, the battery may further include a terminal 600 and a second insulating member 700. The cover plate 500 defines a second through-hole 510, through which a portion of the terminal 300 passes. The terminal 600 is disposed outside the terminal 300, and the second insulating member 700 is disposed between the outer wall of the terminal 600 and the inner wall of the second through-hole 510. The second insulating member 700 is used to insulate the terminal 600 from the cover plate 500.

[0129] In this way, since the terminal 600 and the cover plate 500 are both metal parts, by setting the second insulating part 700 between the terminal 600 and the inner wall of the second through hole 510, the terminal 600 can be abutted against the inner wall of the through hole through the second insulating part 700, and insulation between the terminal 600 and the cover plate 500 can be achieved, thereby avoiding damage to the battery due to a short circuit between the terminal 600 and the cover plate 500.

[0130] refer to Figure 3 and Figure 5 In some embodiments, the battery may further include a sealing ring 800, which is sleeved on the outside of the pole 300 and disposed in the second through hole 510. The terminal 600 and the second insulating member 700 are located on the side of the sealing ring 800 facing away from the first insulating member 400. The sealing ring 800 is used to seal the joint between the terminal 600 and the first insulating member 400 and to seal the joint between the second insulating member 700 and the first insulating member 400.

[0131] In this way, by setting a sealing ring 800 between the first insulating member 400 and the terminal 600, the sealing between the terminal 600 and the first insulating member 400 can be achieved, thereby reducing the probability of the liquid injected into the battery cell 110 leaking from the joint between the first insulating member 400 and the terminal 600. By setting a sealing ring 800 between the second insulating member 700 and the first insulating member 400, the probability of the liquid injected into the battery cell 110 leaking from the joint between the first insulating member 400 and the second insulating member 700 can be reduced, thereby improving the sealing performance of the battery.

[0132] refer to Figure 5 In some embodiments, the side of the sealing ring 800 facing the terminal 600 has a first sealing surface 810 , a second sealing surface 820 , and a third sealing surface 830 located between the first sealing surface 810 and the second sealing surface 820 .

[0133] One end of the second insulating member 700 abuts against the first sealing surface 810, one end of the terminal 600 abuts against the second sealing surface 820, and part of the outer side of the terminal 600 is sealed with the third sealing surface 830. Figure 5 (as indicated by the middle arrow X), the first sealing surface 810 is higher than the second sealing surface 820.

[0134] Thus, by causing the end of the terminal 600 facing the sealing ring 800 to abut against the second sealing surface 820 and the outer side surface of the terminal 600 to abut against the third sealing surface 830, the probability of liquid in the battery cell 110 diffusing from the junction between the terminal 600 and the first insulating member 400 to the second insulating member 700 can be reduced. Furthermore, the channel causes the end of the second insulating member 700 facing the sealing ring 800 to abut against the first sealing surface 810, thereby reducing the risk of liquid leaking into the junction between the second insulating member 700 and the sealing ring 800 from further leaking toward the space between the second insulating member 700 and the cover plate 500.

[0135] Furthermore, by making the first sealing surface 810 higher than the second sealing surface 820, a multi-level seal can be formed between the terminal 600, the second insulating member 700 and the first insulating member 400, thereby improving the sealing effect between the terminal 600, the second insulating member 700 and the first insulating member 400.

[0136] refer to Figure 3 and Figure 5 In some embodiments, the terminal 600 has a first extension 610 on the side facing the cover plate 500, and the first extension 610 is disposed in the second through hole 510. The first extension 610 is disposed on the periphery of the terminal 300 and is connected to the terminal 300. The second insulating member 700 has a second extension 710 on the side facing the cover plate 500, and the second extension 710 is disposed in the second through hole 510 and is disposed on the periphery of the terminal 600.

[0137] In this way, the first extension portion 610 on the terminal 600 is disposed within the second through-hole 510, and the second extension portion 710 on the second insulating member 700 is disposed on the periphery of the first extension portion 610, so that the second extension portion 710 insulates the first extension portion 610 from the inner sidewall of the second through-hole 510 on the cover plate 500. The pole 300, the first extension portion 610, the second extension portion 710, and the inner sidewall of the second through-hole 510 can abut against each other, thereby improving the connection stability and structural compactness of the pole 300, the terminal 600, the second insulating member 700, and the cover plate 500.

[0138] refer to Figure 3 and Figure 5 In some embodiments, the first extension portion 610 has a third through-hole 620. The inner sidewall of the third through-hole 620 has a snap-fit structure 630. The outer sidewall of the pole 300 has a slot 310 that mates with the snap-fit structure 630. The pole 300 passes through the third through-hole 620, and the pole 300 is connected to the first extension portion 610 through the snap-fitting engagement between the slot 310 and the snap-fit structure 630.

[0139] In this way, by setting a snap-fit structure 630 on the inner wall of the third through hole 620 and setting a slot 310 at a position corresponding to the snap-fit structure 630 on the pole 300, the pole 300 and the terminal 600 can be connected through the snap-fit of the snap-fit structure 630 and the slot 310, avoiding the use of the prior art in which the terminal 600 is fixed to the outer side of the terminal 600 by deformation riveting under the action of external force, thereby improving the assembly efficiency between the terminal 600 and the pole 300 and thereby improving the assembly efficiency of the battery.

[0140] Furthermore, since the wall thickness of the first extension portion 610 is smaller than the wall thickness of other areas on the terminal 600, when the terminal 600 is a metal part, the first extension portion 610 can undergo a certain elastic deformation to facilitate the snap-fit structure 630 to be snapped into the slot 310 on the pole 300.

[0141] Continue to refer Figure 3 and Figure 5 In some embodiments, the second insulating member 700 has a first groove 720 on the side facing away from the sealing ring 800. The first groove 720 corresponds to the second extension portion 710. A fourth through hole is provided at the bottom of the first groove 720. The fourth through hole penetrates the second extension portion 710 in the thickness direction. The terminal 600 and the pole 300 pass through the fourth through hole. Part of the structure of the terminal 600 can be set in the first groove 720, and the surface of the terminal 600 where the first extension portion 610 is located can abut against the bottom wall of the first groove 720, which can increase the installation stability between the terminal 600 and the second insulating member 700.

[0142] refer to Figure 2 In some embodiments, the battery 10 further includes two side plates 11 , which are respectively connected to both ends of the first insulating member 400 in the length extension direction, and the battery cell 110 is disposed between the two side plates 11 .

[0143] refer to Figure 4 and Figure 5 In some embodiments, at least a portion of the tab 120 is inserted into the lead-out tab 200 so that the lead-out tab 200 is pressed against the tab 120. If the tab 120 includes a vertical portion 121 and a raised portion 122, the vertical portion 121 on the tab 120 can be inserted into the lead-out tab 200, and a portion of the raised portion 122 can also be inserted into the lead-out tab 200.

[0144] In this way, while the lead-out tab 200 is pressed onto the electrode tab 120, by inserting at least a portion of the electrode tab 120 into the lead-out tab 200, the contact area between the electrode tab 120 and the lead-out tab 200 can be further increased, and the contact resistance between the electrode tab 120 and the lead-out tab 200 can be reduced, thereby reducing power loss and improving the overall energy efficiency of the battery.

[0145] Continue to refer Figure 3 and Figure 5 In some embodiments, the cover plate 500 has a second groove 520, which is connected to the second through hole 510. Part of the structure of the second insulating member 700 is arranged in the second groove 520. The surface of the second insulating member 700 facing the sealing ring 800 abuts against the bottom wall of the second groove 520, which can improve the connection stability between the second insulating member 700 and the cover plate 500.

[0146] refer to Figure 3 and Figure 5 In some embodiments, the second surface 200b of the lead-out tab 200 has at least one channel 210, and the tab 120 is inserted into the channel 210. It is understood that the vertical portion 121 of the tab 120 can be completely inserted into the channel 210, and a portion of the raised portion 122 can also be inserted into the channel 210. If the channel 210 has two opposing inner sidewalls, the two inner sidewalls of the channel 210 can clamp the tab 120.

[0147] Thus, by providing multiple channels 210 on the lead-out tab 200, it is possible to facilitate the insertion of the tab 120 into the lead-out tab 200, facilitate the connection between the lead-out tab 200 and the tab 120, and improve the assembly efficiency of the battery. In addition, if there are multiple tabs 120, by providing multiple channels 210, it is possible to help maintain the consistency of the dimensions of each tab 120, thereby improving the consistency and reliability of the battery cell 110 and reducing the defective product rate during production.

[0148] In some embodiments, the vertical portion 121 of the tab 120 located in the channel 210 can be welded to the two opposite inner sidewalls of the channel 210. For example, solder can be pre-filled in the channel 210, and then the vertical portion 121 of the tab 120 is inserted into the channel 210. The solder in the channel 210 is heated and melted, and after the solder solidifies again, the vertical portion 121 and the two inner sidewalls of the channel 210 are welded together, thereby further improving the connection stability between the lead tab 200 and the tab 120.

[0149] refer to Figure 3 In some embodiments, the lead-out piece 200 has a first end 220 and a second end 230 along its length. Both ends of the channel 210 extend along its length to the end surfaces of the first end 220 and the second end 230, respectively, so that the first end 220 and the second end 230 of the channel 210 are connected through the channel 210.

[0150] By providing the channel 210 on the lead-out tab 200 , it is possible to ensure that each foil is evenly gathered and compacted, thereby forming a more compact and solid tab 120 , and enhancing the mechanical strength of the tab 120 .

[0151] In the length direction of the lead-out piece 200 , the channel 210 may include a gathering section 240 and a clamping section 250 that are connected to each other, and the width of the channel 210 of the clamping section 250 is smaller than the width of the channel 210 of the gathering section 240 .

[0152] In a specific implementation, multiple foils can enter the channel 210 from the gathering section 240 in the length direction of the lead-out piece 200 , and further enter the channel 210 of the clamping section 250 from the channel 210 of the gathering section 240 to form the tab 120 .

[0153] In this way, by making the width of the channel 210 of the gathering section 240 greater than the width of the channel 210 of the clamping section 250, it is convenient to evenly gather the multiple foils located at one end of the battery cell 110 into the channel 210 through the gathering section 240, and further facilitate the clamping section 250 to make the multiple foils gathered in the channel 210 close to each other and compact them together to form a tight and strong tab 120, so that the foil can be directly formed into the tab 120 by using the lead-out piece 200, thereby enriching the function of the lead-out piece 200, and avoiding the use of additional tools for forming the tab 120, thereby improving the assembly efficiency of the battery.

[0154] refer to Figure 3 In some embodiments, the width of the channel 210 of the gathering section 240 gradually decreases in the direction from the gathering section 240 to the clamping section 250 .

[0155] In this way, by gradually reducing the width of the channel 210 of the gathering section 240 in the direction from the gathering section 240 to the clamping section 250, it is convenient for the multiple foils entering the channel 210 of the gathering section 240 to gradually approach each other before entering the clamping section 250, and it is convenient for the multiple foils after gathering to enter the channel 210 of the clamping section 250, which facilitates the forming of the tab 120 and the clamping of the tab 120 by the lead-out sheet 200.

[0156] refer to Figure 5 In some embodiments, along the width direction of the lead-out plate 200 , two opposite inner side walls of the channel 210 are plane.

[0157] In this way, by making the two opposite inner walls of the channel 210 flat along the thickness direction of the lead-out plate 200, the movement of the pole tab 120 in the channel 210 can be facilitated during the relative sliding of the lead-out plate 200 and the pole tab 120, which helps to improve the assembly and connection efficiency between the pole tab 120 and the lead-out plate 200.

[0158] refer to Figure 6 In another embodiment, along the width direction of the lead-out plate 200 , two opposite inner side walls of the channel 210 are curved surfaces.

[0159] In this way, by making the inner side wall of the channel 210 a curved surface, the contact area between the inner side wall of the channel 210 and the tab 120 can be increased, and since the inner side wall of the channel 210 is a curved surface, the friction resistance between the tab 120 and the inner side wall of the channel 210 can be increased, thereby improving the connection stability between the tab 120 and the lead-out plate 200.

[0160] refer to Figure 5 and Figure 6 In some embodiments, along the thickness direction of the lead-out tab 200 , the height of the tab 120 is less than the thickness of the lead-out tab 200 .

[0161] In this way, by making the height of the tab 120 smaller than the thickness of the lead-out piece 200 in the thickness direction of the lead-out piece 200, if the channel 210 is partially penetrated in the thickness direction of the lead-out piece 200, it is possible to prevent the tab 120 from extending to the outside of the channel 210 in the thickness direction of the lead-out piece 200, thereby preventing the tab 120 extending to the outside of the channel 210 from affecting the connection between the first insulating member 400 and the lead-out piece 200.

[0162] If the channel 210 is closed on the side of the lead-out tab 200 facing away from the battery cell 110 , it is possible to prevent the foil from being too long to enter the channel 210 during the forming process of the lead-out tab 200 to the tab 120 .

[0163] In some embodiments, if the tab 120 is inserted into the channel 210 of the lead-out sheet 200, and in the thickness direction of the lead-out sheet 200, the channel 210 can partially penetrate the first surface 200a of the lead-out sheet 200, then welding can be performed on the area on the first surface 200a penetrated by the channel 210, and the tab 120 in the channel 210 can be welded and connected to the lead-out sheet 200, thereby improving the connection stability between the lead-out sheet 200 and the tab 120.

[0164] refer to Figure 3 and Figure 5 In some embodiments, the lead sheet 200 may include multiple lead members 260 and connectors 270. The multiple lead members 260 are spaced apart along the thickness of the battery cell 110 to form a channel 210 between two adjacent lead members 260. The multiple lead members 260 are connected by connectors 270, which are located on the side of the multiple lead members 260 facing away from the tabs 120. The pole 300 can be disposed on the side of the connector 270 facing away from the lead members 260.

[0165] refer to Figure 7 In some embodiments, the tab 120 is in a folded state, the second surface 200 b of the lead-out sheet 200 is pressed and adhered to one surface of the tab 120 , and the other surface of the tab 120 is connected to the battery cell 110 .

[0166] In some embodiments, if the tab 120 has a vertical portion 121 and a raised portion 122, the vertical portion 121 of the tab 120 can be folded relative to the raised portion 122 so that one surface of the vertical portion 121 is attached to the battery cell 110 and the raised portion 122, and the other surface of the vertical portion 121 is attached to the second surface 200b of the lead-out sheet 200.

[0167] In this way, by folding the tab 120, the second side 200b of the lead-out piece 200 is pressed against and adhered to one side of the tab 120, and the other side of the tab 120 is connected to the battery cell 110, it is possible to use a lead-out piece 200 with a thickness less than the length of the tab 120 to electrically connect with the tab 120, thereby reducing the thickness of the lead-out piece 200, and further reducing the space occupied by the lead-out piece 200 inside the shell 900, thereby improving the utilization rate of the internal space of the shell 900. Under the condition of the same battery specifications, the shell 900 can accommodate a battery cell 110 of a larger volume, thereby increasing the capacity of the battery.

[0168] refer to Figure 7 In some embodiments, there are multiple tabs 120. When the tabs 120 are in the folded state, the tabs 120 fold in the same direction, and the folded tabs 120 are spaced apart. In some embodiments, the multiple tabs 120 in the folded state can be spaced apart along the thickness direction of the battery cell 110.

[0169] In this way, by providing multiple tabs 120, the contact area between the tabs 120 and the lead-out tabs 200 can be increased, thereby reducing the contact resistance between the tabs 120 and the lead-out tabs 200, thereby reducing power loss and improving the overall energy efficiency of the battery.

[0170] refer to Figure 7 In some embodiments, the width of the folded tab 120 is h1, the thickness of the battery cell 110 is W1, the number of tabs 120 is n1, and the width of the tab 120 is h1, the thickness of the battery cell 110 is W1, and n1 satisfies: h1 ≤ W1 / n1. This prevents the tab 120 from being too wide, causing the tab 120 near the edge of the battery cell 110 in the thickness direction to extend outside the battery cell 110 after folding.

[0171] Thus, by ensuring that n1 satisfies the condition h1 ≤ W1 / n1, the number of tabs 120 can be increased as the thickness of the battery cell 110 increases, thereby ensuring a greater contact area between the tabs 120 and the lead tabs 200 as the thickness of the battery cell 110 increases. For a given thickness W1 of the battery cell 110, a greater number n1 of tabs 120 reduces the width h1 of the folded tabs 120, and thus reduces the distance between the lead tabs 200 and the battery cell 110.

[0172] refer to Figure 8 The present invention also provides a tab forming device 20, which may include a forming member 21 and a folding member 22 connected to each other. The forming member 21 is used to gather multiple foils on the battery cell 110 to form a tab 120, and the folding member 22 is used to fold the tab 120 into the folded state of the battery tab 120 as described above.

[0173] In this way, before the lead-out tab 200 in the above-mentioned battery is connected to the folded tab 120, the tab 120 is folded by using the tab forming device 20, so that the foil on the battery cell 110 can be gathered and the tab 120 can be formed by the forming component 21, and the formed tab 120 can be further folded using the folding component 22 to facilitate folding the tab 120, which can simplify the dependence on manual operation, improve the forming efficiency of the tab 120, and thus improve the assembly efficiency of the battery.

[0174] refer to Figure 8 In some embodiments, the molding member 21 may include at least one molding channel 21a. When multiple foils on the battery cell 110 pass through the molding channel 21a, the molding channel 21a is used to gather the multiple foils to form the tab 120. The folding member 22 may include at least one folding channel 22a, each folding channel 22a being connected to a molding channel 21a. When the tab 120 passes through the folding channel 22a, the folding channel 22a is used to bend the tab 120 into a folded state.

[0175] Thus, by providing at least one forming channel 21a on the forming member 21 and allowing the multiple foils on the battery cell 110 to slide relative to the forming channel 21a, the multiple foils are gathered and clamped by the forming channel 21a to form the tab 120. This ensures that each foil is evenly gathered and compacted, thereby forming a tighter and stronger tab 120 and enhancing the mechanical strength of the tab 120. By evenly gathering the multiple foils, the resistance can be reduced, the current transmission efficiency can be increased, and the overall electrical performance of the battery cell 110 can be improved.

[0176] If there are multiple forming channels 21 a , it can ensure that the size and shape of each tab 120 are consistent, thereby improving the consistency and reliability of the battery cell 110 and reducing the defective product rate during production.

[0177] The formed tab 120 can be further folded through the multiple folding channels 22a on the folding member 22 so that the tab 120 is in a folded state, thereby ensuring the mechanical strength of the folded tab 120 and the uniformity of the surface of the folded tab 120, improving the current transmission efficiency, and improving the overall electrical performance of the battery cell 110.

[0178] refer to Figure 8 In some embodiments, the molding member 21 may include a plurality of molding members 23, which may be arranged at intervals, with molding channels 21a formed between adjacent molding members 23. The folding member 22 may include a plurality of folding members 24, which may be arranged at intervals, with folding channels 22a formed between adjacent folding members 24. The folding members 24 are arranged in the same direction as the molding members 23. The tab molding device 20 may further include a connecting member 25, by which the plurality of molding members 23 and the plurality of folding members 24 may be connected.

[0179] refer to Figure 8 and Figure 9 In some embodiments, the side wall of the folded channel 22a can be inclined relative to the width direction of the channel, and the angle between the side wall of the folded channel 22a and the width direction of the channel (such as Figure 9 In some embodiments, the angle α shown in FIG is less than or equal to 90°. In some embodiments, the angle gradually decreases from the forming channel 21a to the folding channel 22a, so that the tab 120 can be folded through the folding channel 22a.

[0180] refer to Figure 10 In some embodiments, there are multiple tabs 120, which may include a first tab 120a and a second tab 120b that are adjacent and spaced apart. The first tab 120a and the second tab 120b have opposite folding directions. For example, the first tab 120a folds toward the second tab 120b, and the second tab 120b can fold toward the first tab 120a.

[0181] When one of the first and second tabs 120a, 120b is in the folded state, a gap 120c is formed between the first and second tabs 120a, 120b. A portion of the other of the first and second tabs 120a, 120b is located within the gap 120c. The second surface 200b of the lead tab 200 is bonded and connected to a portion of the surface of the first or second tab 120a, 120b. Portions of the surface of the first and second tabs 120a, 120b are both connected to the battery cell 110.

[0182] In this way, compared with the situation where one side of the tab 120 between the lead-out tab 200 and the battery cell 110 is connected to the lead-out tab 200 and the other side of the tab 120 is electrically connected to the battery cell 110, the thickness of the stacked structure formed after the first tab 120a and the second tab 120b are folded increases. When the lead-out tab 200 and the tab 120 are welded using laser penetration welding, the probability of the first tab 120a and the second tab 120b being welded through can be reduced, thereby improving the weldability between the lead-out tab 200 and the tab 120.

[0183] Among them, if the electrode tab 120 has a vertical portion 121 and a raised portion 122, and the first electrode tab 120a is folded relative to the second electrode tab 120b first, the vertical portion 121 of the first electrode tab 120a can be folded toward the second electrode tab 120b, and the vertical portion 121 of the folded first electrode tab 120a is attached to the raised portions 122 of the first electrode tab 120a and the second electrode tab 120b.

[0184] After the first pole tab 120a is folded, the vertical portion 121 of the second pole tab 120b is folded toward the vertical portion 121 of the first pole tab 120a that has been folded, so that the first pole tab 120a is pressed under the second pole tab 120b, and a gap 120c is formed between the vertical portion 121 of the folded second pole tab 120b and the raised portion 122 of the second pole tab 120b, and the vertical portion 121 of the first pole tab 120a can be located within the gap 120c.

[0185] refer to Figure 10 In some embodiments, the width of the first tab 120 a or the second tab 120 b in the folded state is h2, the thickness of the battery cell 110 is W2, the number of tabs 120 is n2, and h2, W2, and n2 satisfy: h2≤2W2 / n2.

[0186] In this way, by ensuring that n2 satisfies the condition h2 ≤ W2 / n2, the number of tabs 120 can be increased as the thickness of the battery cell 110 increases, thereby ensuring a greater contact area between the tabs 120 and the lead tabs 200 when the thickness of the battery cell 110 increases. This prevents the tabs 120 near the thickness edge of the battery cell 110 from extending outside the battery cell 110 after folding due to the first tab 120a or the second tab 120b being too wide.

[0187] Furthermore, when the thickness W2 of the battery cell 110 is constant, the greater the number n2 of the tabs 120 , the smaller the width h2 of the first tab 120 a or the second tab 120 b in the folded state, and the smaller the distance between the lead-out tab 200 and the battery cell 110 .

[0188] refer to Figure 11In some embodiments, if a tab forming device 20 is used to fold the first tab 120a and the second tab 120b, the tab forming device 20 includes a forming member 21 and a folding member 22. The forming member 21 may include a first forming channel 21b and a second forming channel 21c. The first forming channel 21b is used to gather multiple foils on the battery cell 110 to form the first tab 120a, and the second forming channel 21c is used to gather multiple foils on the battery cell 110 to form the second tab 120b.

[0189] The folding member 22 may include a first folding channel and a second folding channel. The first folding channel is communicated with the first forming channel 21 b , and the second channel is communicated with the second forming channel 21 c .

[0190] When the first electrode tab 120a passes through the first folding channel, the first folding channel is used to fold the first electrode tab 120a toward the second electrode tab 120b. When the second electrode tab 120b passes through the second folding channel, the second folding channel is used to fold the second electrode tab 120b toward the folded first electrode tab 120a, and partially overlap the folded second electrode tab 120b on the first electrode tab 120a.

[0191] In this way, the first and second forming channels 21b and 21c can be used to gather the multiple foils on the battery cell 110 to form two first and second tabs 120a and 120b of approximately identical size and shape, thereby improving the consistency and reliability of the battery cell 110. Furthermore, the first and second folding channels on the folding member 22 fold the first and second tabs 120a and 120b in opposite directions, with the second tab 120b partially overlapping the first tab 120a. This increases the total thickness of the tab 120 between the lead tab 200 and the battery cell 110, reduces the probability of the tab 120 being welded through during laser penetration welding, and improves the weldability between the lead tab 200 and the tab 120.

[0192] refer to Figure 1 The present application also provides a battery device, which may include the above-mentioned battery 10. In some embodiments, the battery device may be a battery pack or a battery module, and each battery pack or battery module may include multiple batteries 10.

[0193] An embodiment of the present application also provides an electrical device, which may include an electrical device and a battery or battery device as described above, wherein the battery or battery device can be used to provide electrical energy to the electrical device.

[0194] In some embodiments, the electrical device may be a vehicle, an aircraft, a ferry, or a computer. The vehicle may be an electric vehicle (EV), a pure electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range-extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), or a new energy vehicle.

[0195] The electrical device provided in the embodiment of the present application can reduce the probability of the battery being deformed and damaged indirectly due to external force collision by installing and using the above-mentioned battery, thereby improving the safety of the electrical equipment.

[0196] When assembling batteries of the same size, compared with the prior art, electrical devices can obtain larger battery capacity and longer battery life by assembling the batteries provided in the above-mentioned embodiments of the present application.

[0197] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0198] It should be noted that phrases such as "in a specific implementation," "in some embodiments," "in this embodiment," and "exemplarily" mentioned in the specification indicate that the described embodiment may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0199] Generally speaking, terms should be understood, at least in part, based on the context in which they are used. For example, as used herein, the term "one or more" can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense, depending at least in part on the context. Similarly, terms such as "a," "an," or "the" can also be understood to convey either singular or plural usage, depending at least in part on the context.

[0200] It should be readily understood that “on,” “above,” and “over” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0201] Additionally, spatially relative terms, such as "below," "beneath," "beneath," "above," and the like, may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be in other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0202] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery (10), characterized in that: include: A battery cell assembly (100), the battery cell assembly (100) comprising a battery cell (110) and a tab (120), the tab (120) being located at one end of the battery cell (110) and electrically connected to the battery cell (110); A lead-out piece (200), the lead-out piece (200) having a first surface (200a) and a second surface (200b) opposite to each other, the second surface (200b) facing the battery core (110), and the lead-out piece (200) being pressed onto the tab (120) and connected to the tab (120); A pole (300), the pole (300) being located on the first surface (200a) of the lead-out piece (200) and connected to the lead-out piece (200); a first insulating member (400), the first insulating member (400) being located on a first surface (200a) of the lead-out plate (200); A cover plate (500) is provided on the first insulating member (400), and the pole (300) is provided through the first insulating member (400) and the cover plate (500).

2. The battery according to claim 1, characterized in that At least a portion of the tab (120) is inserted into the lead-out piece (200) so as to press the lead-out piece (200) onto the tab (120).

3. The battery according to claim 2, characterized in that The second surface (200b) has at least one channel (210), and the tab (120) is inserted into the channel (210).

4. The battery according to claim 3, characterized in that Along the length direction of the lead-out piece (200), the lead-out piece (200) has a first end (220) and a second end (230); Both ends of the channel (210) extend along the length direction of the lead-out piece (200) to the end surfaces of the first end (220) and the second end (230), respectively; In the length direction of the lead-out piece (200), the channel (210) includes a gathering section (240) and a clamping section (250) that are connected, and the width of the channel (210) of the clamping section (250) is smaller than the width of the channel (210) of the gathering section (240).

5. The battery according to claim 4, characterized in that In a direction from the gathering section (240) to the clamping section (250), the width of the channel (210) of the gathering section (240) gradually decreases.

6. The battery according to any one of claims 3 to 5, characterized in that: Along the width direction of the lead-out piece (200), the two opposite inner side walls of the channel (210) are both planes; Alternatively, the two opposite inner side walls of the channel (210) are both curved surfaces.

7. The battery according to any one of claims 1 to 5, characterized in that: Along the thickness direction of the lead-out piece (200), the height of the tab (120) is smaller than the thickness of the lead-out piece (200).

8. The battery according to any one of claims 1 to 5, characterized in that: The channel partially penetrates the lead-out piece in a thickness direction of the lead-out piece, so as to weld the electrode tab inserted in the channel to the lead-out piece on a surface of the lead-out piece facing away from the electrode tab.

9. The battery according to claim 1, characterized in that The tab (120) is in a folded state, the second surface (200b) of the lead-out piece (200) is pressed and adhered to one surface of the tab (120), and the other surface of the tab (120) is connected to the battery core (110).

10. The battery according to claim 9, characterized in that There are a plurality of pole tabs (120); when the pole tabs (120) are in a folded state, the folding directions of the pole tabs (120) are the same, and the folded pole tabs (120) are arranged at intervals.

11. The battery according to claim 10, characterized in that The width of the tab (120) in the folded state is h1, the thickness of the battery cell (110) is W1, the number of the tabs (120) is n1, and h1, W1, and n1 satisfy: h1≤W1 / n1.

12. The battery according to claim 9, characterized in that There are a plurality of pole tabs (120), and the plurality of pole tabs (120) include a first pole tab (120a) and a second pole tab (120b); The folding directions of the first electrode tab (120a) and the second electrode tab (120b) are opposite; One of the first electrode tab (120a) and the second electrode tab (120b) has a gap (120c) when in a folded state, and a portion of the other of the first electrode tab (120a) and the second electrode tab (120b) is located within the gap (120c); The second surface (200b) of the lead-out sheet (200) is bonded and connected to a portion of the surface of the first pole tab (120a) or the second pole tab (120b), and a portion of the surface of the first pole tab (120a) and a portion of the surface of the second pole tab (120b) are both connected to the battery cell (110).

13. The battery according to claim 12, characterized in that The width of the first electrode tab (120a) or the second electrode tab (120b) in the folded state is h2, the thickness of the battery cell (110) is W2, the number of the electrode tabs (120) is n2, and h2, W2, and n2 satisfy: h2≤2W2 / n2.

14. The battery according to any one of claims 1 to 5, characterized in that: The length of the lead-out piece (200) is smaller than the width of the battery core (110).

15. The battery according to any one of claims 1 to 5, characterized in that: The first insulating member (400) has a mounting groove (410) on a side facing the lead-out piece (200); The lead-out piece (200) is arranged in the mounting groove (410); A first through hole (420) is formed on the bottom wall of the installation groove (410), and the pole (300) passes through the first through hole (420).

16. The battery according to any one of claims 1 to 5, characterized in that: The pole (300) and the lead-out piece (200) are an integrated structure.

17. The battery according to any one of claims 1 to 5, characterized in that: The battery further includes a terminal (600) and a second insulating member (700); The cover plate (500) is provided with a second through hole (510), and a portion of the pole (300) passes through the second through hole (510); The terminal (600) is arranged on the outside of the pole (300); The second insulating member (700) is arranged between the outer side wall of the terminal (600) and the inner side wall of the second through hole (510), and the second insulating member (700) is used to insulate the terminal (600) from the cover plate (500).

18. The battery according to claim 17, characterized in that The battery further comprises a sealing ring (800); The sealing ring (800) is sleeved on the outside of the pole (300) and arranged in the second through hole (510); the terminal (600) and the second insulating member (700) are located on a side of the sealing ring (800) facing away from the first insulating member (400); The sealing ring (800) is used to seal the joint between the terminal (600) and the first insulating member (400) and to seal the joint between the second insulating member (700) and the first insulating member (400).

19. The battery according to claim 18, characterized in that The sealing ring (800) has a first sealing surface (810), a second sealing surface (820), and a third sealing surface (830) located between the first sealing surface (810) and the second sealing surface (820) on a side facing the terminal (600); One end of the second insulating member (700) abuts against the first sealing surface (810), one end of the terminal (600) abuts against the second sealing surface (820), and part of the outer side surface of the terminal (600) is sealed with the third sealing surface (830); In the thickness direction of the cover plate (500), the first sealing surface (810) is higher than the second sealing surface (820).

20. The battery according to claim 17, wherein The terminal (600) has a first extension portion (610) on a side facing the cover plate (500), and the first extension portion (610) is arranged in the second through hole (510); The first extension portion (610) is arranged on the outer periphery of the pole (300) and is connected to the pole (300); The second insulating member (700) has a second extension portion (710) on a side facing the cover plate (500), the second extension portion (710) is arranged in the second through hole (510), and the second extension portion (710) is arranged on the periphery of the terminal (600).

21. The battery according to claim 20, characterized in that The first extension portion (610) has a third through hole (620), the inner side wall of the third through hole (620) has a snap-fit structure (630), and the outer side wall of the pole (300) has a snap-fit groove (310) that matches the snap-fit structure (630); The pole (300) passes through the third through hole (620), and the pole (300) is connected to the first extension portion (610) through the engagement of the clamping groove (310) and the clamping structure (630).

22. A battery device, characterized in that: Comprising the battery according to any one of claims 1 to 21.

23. An electrical device, characterized in that: The invention comprises an electric device, and the battery according to any one of claims 1 to 21 or the battery device according to claim 22, wherein the battery or the battery device is used to provide electrical energy to the electric device.

24. A tab forming device, characterized in that: It comprises a forming member (21) and a folding member (22) connected to each other; The forming component (21) is used to gather a plurality of foils on the battery core (110) to form a tab (120); The folding member (22) is used to fold the tab (120) into a folded state of the tab (120) of the battery (10) according to any one of claims 9 to 13.

25. The tab forming device according to claim 24, characterized in that: The molding component (21) includes at least one molding channel (21a), and when a plurality of foils on the battery cell (110) pass through the molding channel (21a), the molding channel (21a) is used to gather the plurality of foils to form the tab (120); The folding member (22) includes at least one folding channel (22a), and each of the folding channels (22a) is communicated with one of the forming channels (21a); When the tab (120) passes through the folding channel (22a), the folding channel (22a) is used to bend the tab (120) into a folded state.

26. The tab forming device according to claim 24, characterized in that: The molding member (21) comprises a first molding channel (21b) and a second molding channel (21c), wherein the first molding channel (21b) is used to gather a plurality of foils on the battery core (110) to form a first pole tab (120a), and the second molding channel (21c) is used to gather a plurality of foils on the battery core (110) to form a second pole tab (120b); The folding member (22) comprises a first folding channel and a second folding channel, the first folding channel is connected to the first forming channel (21b), and the second folding channel is connected to the second forming channel (21c); When the first electrode tab (120a) passes through the first folding channel, the first folding channel is used to fold the first electrode tab (120a) toward the second electrode tab (120b); When the second electrode tab (120b) passes through the second folding channel, the second folding channel is used to fold the second electrode tab (120b) toward the folded first electrode tab (120a), and to partially overlap the folded second electrode tab (120b) on the first electrode tab (120a).

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