Collecting disc, cover plate assembly and cylindrical battery

Abstract

The utility model relates to the technical field of batteries, in particular to a collector plate, a cover plate assembly and a cylindrical battery. The collector plate comprises a plate body and a connecting part, a connecting groove is formed in the plate body, one end of the connecting part is connected into the connecting groove, the connecting part has a first bending state and a second bending state relative to the plate body, when the connecting part is in the first bending state, the connecting part is separated from the connecting groove, and when the connecting part is in the second bending state, the connecting part is separated from the connecting groove. And when the connecting part is in the second bending state, the connecting part can be completely accommodated in the connecting groove. And the connecting part is configured to be capable of being bent towards the direction close to the tray body, so that the connecting part is converted from the first bent state to the second bent state. The cover plate assembly comprises the flow collecting disc. The cylindrical battery comprises the cover plate assembly. The current collecting disc and the cover plate assembly are light and thin in structure, and the cylindrical battery has higher battery capacity.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a current collection disc, cover plate subassembly and cylindrical battery. BACKGROUND

[0002] Lithium ion battery is widely used in power field such as electric vehicle and consumer field such as mobile phone, watch, tablet computer, notebook computer because of high specific energy, strong continuation ability, long cycle life, wide working range, short charging time, large current discharge and other advantages.Lithium ion cell is the important component unit of lithium ion battery, and it mainly includes current collector, positive active material, negative active material, diaphragm and electrolyte etc.Current collector is mainly to collect the current generated by positive and negative active materials and output externally.

[0003] At present, the winding cell of large cylindrical lithium ion battery is full tab or multi-tab, and the tab of the cell needs to be treated by tab rubbing, and the tab after rubbing needs to be welded with the current collection disc for conduction.The existing current collection disc is generally an outer folding integrated structure, that is, the connecting part is connected to the end of the disc body, and after the connecting part is bent, the connecting part and the disc body overlap together, resulting in that the thickness of the folded current collection disc is thick, which affects the volume of the cylindrical battery. SUMMARY

[0004] The main purpose of the utility model is to provide a current collection disc, cover plate subassembly and cylindrical battery, which aims to solve the technical problem that the overall thickness of the existing current collection disc is thick after bending, affecting the volume of the cylindrical battery.

[0005] To achieve the above-mentioned purpose, the utility model provides a current collection disc, which comprises:

[0006] Disc body, the disc body is provided with a connecting groove;

[0007] Connecting part, one end of the connecting part is connected in the connecting groove, the connecting part has a first bending state and a second bending state relative to the disc body, when the connecting part is in the first bending state, the connecting part is separated from the connecting groove, when the connecting part is in the second bending state, the connecting part can be completely accommodated in the connecting groove;

[0008] Wherein, the connecting part is configured to be able to bend towards the direction close to the disc body, so that the connecting part changes from the first bending state to the second bending state.

[0009] In some embodiments, along the thickness direction of the disc body, the thickness of the disc body at the connecting groove is less than the thickness of the disc body at the non-connecting groove;

[0010] Or, along the thickness direction of the disc body, the connecting groove penetrates through the disc body.

[0011] In some embodiments, a side of the disc body away from the connecting portion is a connecting surface, the connecting surface is adapted to contact with a tab of an electrode, and the disc body is provided with a protrusion on the connecting surface.

[0012] In some embodiments, a side of the disc body close to the connecting portion is a welding surface, the welding surface is provided opposite to the connecting surface, and the disc body is provided with a recess on the welding surface.

[0013] The recess is provided opposite to the protrusion.

[0014] In some embodiments, the connecting portion and the connecting groove have a connecting end therebetween, and a vertical distance H between the connecting end and an edge position of the disc body satisfies: 2mm≤H≤1 / 3R.

[0015] R is a diameter of the current collecting disc.

[0016] In some embodiments, a width W of the connecting portion satisfies: 5mm≤W≤1 / 2R.

[0017] R is a diameter of the current collecting disc.

[0018] In some embodiments, the disc body and the connecting portion are a stamping integrated structure.

[0019] Correspondingly, the utility model also proposes a cover plate assembly, comprising:

[0020] The current collecting disc in any of the above embodiments has a connecting portion and a connecting groove, and a first connecting hole is arranged at an end of the connecting portion away from the connecting end.

[0021] The cover body is provided with a second connecting hole, and the second connecting hole and the first connecting hole are arranged correspondingly.

[0022] The pole is sequentially arranged in the second connecting hole and the first connecting hole.

[0023] In some embodiments, a first insulating pad is arranged between the cover body and the connecting portion, and a second insulating pad is arranged between the pole and the cover body.

[0024] Correspondingly, the utility model also proposes a cylindrical battery, comprising:

[0025] The cover plate assembly in any of the above embodiments;

[0026] The shell is provided with a containing cavity.

[0027] The electrode is arranged in the containing cavity, and a tab is arranged at an end of the electrode.

[0028] The cover plate assembly is connected to the shell near one end of the tab, and welding is performed between the cover plate assembly and the tab.

[0029] Compared with the prior art, the utility model has the advantages of:

[0030] In the technical scheme of the utility model, before the current collecting disc and the tab are welded, the connecting part is in the first bending state relative to the disc body, so that the connecting part is separated from the connecting groove of the disc body, for example, the connecting part can be bent outward in the direction away from the disc body. When the current collecting disc and the tab are welded by using laser, since the connecting groove is not blocked by the connecting part, the connecting part will not have adverse effects on the welding of the current collecting disc and the tab, and the heat generated by the laser can be quickly and uniformly transmitted to the contact surface of the disc body and the tab, thereby facilitating the improvement of the welding strength and welding quality between the current collecting disc and the tab and realizing the welding conduction of the tab and the current collecting disc. After the current collecting disc and the tab are welded, the connecting part is in the second bending state relative to the disc body, so that the connecting part is completely accommodated in the connecting groove, for example, a downward pressing force can be applied to the connecting part, so that the connecting part is bent in the direction close to the disc body and is finally completely accommodated in the connecting groove. By adopting the above structure, the connecting part is equivalent to being filled into the gap in the connecting groove, that is, after the connecting part is bent, the connecting part is not arranged in overlap with the disc body, so that the overall thickness of the current collecting disc after the connecting part is bent is consistent with the overall thickness of the original single-layer current collecting disc and does not increase the additional thickness. Moreover, one end of the connecting part is connected to the connecting groove, so that there is no additional flexible connecting structure between the connecting part and the disc body, so that the overall integrity of the current collecting disc is good and no additional material is needed.

[0031] The current collecting disc provided by the utility model has a simple structure, and the overall thickness of the current collecting disc does not change before and after the connecting part is bent, and is always the thickness of the single-layer current collecting disc, thereby facilitating the reduction of the volume of the current collecting disc. In the case of the same cylindrical battery volume, the current collecting disc provided by the utility model can save a certain amount of internal space, and the saved space can be used for the design of the main body of the battery cell, so as to improve the capacity of the cylindrical battery and improve the energy density of the cylindrical battery. At the same time, the connecting part and the disc body are integrally connected, thereby facilitating the saving of the materials used in the production of the current collecting disc, so as to reduce the production cost of the current collecting disc and even the cylindrical battery.

[0032] The cover plate assembly provided by the utility model has a light and thin structure and small thickness. The cylindrical battery provided by the utility model can save the space of the accommodating cavity, so that a larger volume of battery cell can be accommodated in the accommodating cavity, thereby facilitating the improvement of the battery capacity and energy density of the cylindrical battery. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in the drawings without creative labor.

[0034] Figure 1 The overall structure schematic diagram of the current collector plate in the first bending state according to an embodiment of the present application is shown in the figure.

[0035] Figure 2 The overall structure schematic diagram of the current collector plate in the second bending state from the first visual angle according to an embodiment of the present application is shown in the figure.

[0036] Figure 3 The overall structure schematic diagram of the current collector plate in the second bending state from the second visual angle according to an embodiment of the present application is shown in the figure.

[0037] Figure 4 The overall structure schematic diagram of the current collector plate in the second bending state from the third visual angle according to an embodiment of the present application is shown in the figure.

[0038] Figure 5 The overall structure schematic diagram of the cover plate assembly in the first bending state according to an embodiment of the present application is shown in the figure.

[0039] Figure 6 The overall structure schematic diagram of the cover plate assembly in the second bending state according to an embodiment of the present application is shown in the figure.

[0040] Figure 7 The overall structure explosion view of the cover plate assembly in the second bending state according to an embodiment of the present application is shown in the figure.

[0041] Explanation of figure mark:

[0042] 10, current collector plate;

[0043] 20, cover plate assembly;

[0044] 100, disc body;

[0045] 110, connecting groove; 120, connecting surface; 130, welding surface; 140, liquid injection hole;

[0046] 121, protruding part;

[0047] 131, recessed part;

[0048] 200, connecting part;

[0049] 210, connecting end; 220, first connecting hole;

[0050] 300, cover body;

[0051] 310, second connecting hole;

[0052] 400, pole;

[0053] 500, first insulating pad;

[0054] 600, second insulating pad.

[0055] The implementation, functional features and advantages of the utility model will be further described with reference to the drawings in combination with embodiments. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0057] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture, and if the specific posture changes, the directional indications also change accordingly.

[0058] In addition, if the embodiments of the utility model involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one feature. In addition, if "and / or", "and / or" or "and / or" appear in the whole text, the meaning includes three parallel schemes, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0059] Lithium ion battery has high specific energy, strong endurance, long cycle life, wide operating range, short charging time, large current discharge and other advantages, and is widely used in power field such as electric vehicles and consumer field such as mobile phones, watches, tablets and notebooks. Lithium ion cell is an important component unit of lithium ion battery, which mainly includes current collector, positive active material, negative active material, separator and electrolyte. The current collector mainly collects the current generated by the positive and negative active materials and outputs it externally.

[0060] At present, the winding cell of the large cylindrical lithium ion battery is full tab or multi-tab, and the cell tab needs to be tabbed and flattened. The tab after rubbing needs to be welded with the current collecting disc for conduction. The existing current collecting disc is generally an outer folding integrated structure, that is, the connecting part is connected to the end of the disc body. After the connecting part is bent, the connecting part and the disc body are overlapped together, so that the thickness of the folded current collecting disc is thick, which affects the volume of the cylindrical battery.

[0061] Therefore, in order to solve the technical problem that the overall thickness of the existing current collecting disc 10 is thick after being bent, which affects the volume of the cylindrical battery, with reference to Figures 1 to 7 The utility model discloses an embodiment provides a current collecting disc 10 for welding the tab of cell. The current collecting disc 10 includes a disc body 100 and a connecting part 200, the disc body 100 is provided with a connecting groove 110, one end of the connecting part 200 is connected in the connecting groove 110, the connecting part 200 has a first bending state and a second bending state relative to the disc body 100, when the connecting part 200 is in the first bending state, the connecting part 200 is separated from the connecting groove 110, when the connecting part 200 is in the second bending state, the connecting part 200 can be completely accommodated in the connecting groove 110. The shape structure of the connecting part 200 can be matched with the shape structure of the connecting groove 110, so as to ensure that the connecting part 200 can be tightly accommodated in the connecting groove 110, thereby ensuring the overall flatness of the current collecting disc 10. The connecting part 200 is configured to be able to bend towards the direction close to the disc body 100, so as to change the connecting part 200 from the first bending state to the second bending state.

[0062] Specifically, in the present embodiment, before the current collecting disc 10 and the tab are welded, the connecting portion 200 is in a first bent state relative to the disc body 100, such that the connecting portion 200 is separated from the connecting groove 110 of the disc body 100, for example, the connecting portion 200 can be bent outwardly in a direction away from the disc body 100. When the current collecting disc 10 and the tab are welded by using laser, since the connecting groove 110 is not blocked by the connecting portion 200, the connecting portion 200 will not adversely affect the welding of the current collecting disc 10 and the tab, and the heat generated by the laser can be quickly and uniformly transmitted to the contact surface of the disc body 100 and the tab through the connecting groove 110, thereby facilitating to improve the welding strength and welding quality between the current collecting disc 10 and the tab, and realizing the welding conduction of the tab and the current collecting disc 10. After the current collecting disc 10 and the tab are welded, the connecting portion 200 is in a second bent state relative to the disc body 100, such that the connecting portion 200 is completely accommodated in the connecting groove 110, for example, a downward pressing force can be applied to the connecting portion 200, so that the connecting portion 200 is bent in a direction close to the disc body 100, and finally completely accommodated in the connecting groove 110. By using the above structure, the connecting portion 200 is equivalent to filling into the gap at the connecting groove 110, that is, after the connecting portion 200 is bent, the connecting portion 200 will not be arranged overlappingly with the disc body 100, so that the overall thickness of the current collecting disc 10 after the connecting portion 200 is bent is consistent with the overall thickness of the original single-layer current collecting disc 10, and will not increase additional thickness. Moreover, one end of the connecting portion 200 is connected in the connecting groove 110, so that there is no additional flexible connecting structure between the connecting portion 200 and the disc body 100, so that the overall integrity of the current collecting disc 10 is good, and no additional material is needed.

[0063] The current collecting disc 10 provided by the present embodiment has a simple structure, and the overall thickness of the current collecting disc 10 will not change before and after the connecting portion 200 is bent, and is always the thickness of the single-layer current collecting disc 10, thereby facilitating to reduce the volume of the current collecting disc 10. In the case of the same cylindrical battery volume, the current collecting disc 10 provided by the present embodiment can save a certain internal space, and the saved space can be used for the design of the battery body to improve the capacity of the cylindrical battery and improve the energy density of the cylindrical battery. At the same time, the connecting portion 200 and the disc body 100 are integrally connected, thereby facilitating to save the materials used in the production of the current collecting disc 10, so as to reduce the production cost of the current collecting disc 10 and even the cylindrical battery.

[0064] In some embodiments, referring to Figures 1 to 4 , along the thickness direction of the disc body 100, the thickness of the disc body 100 at the connecting groove 110 is less than the thickness of the disc body 100 at the non-connecting groove 110. In other words, the connecting groove 110 can not be a structure penetrating through the disc body 100.

[0065] Specifically, in the present embodiment, when laser welding the current collecting plate 10 and the tab, since the thickness at the connecting groove 110 is thinner, the laser is more likely to penetrate the disc body 100, effectively delivering energy to the contact surface of the current collecting plate 10 and the tab, improving the welding efficiency and quality between the current collecting plate 10 and the tab. At the same time, since the connecting groove 110 is not completely through the disc body 100, the current collecting plate 10 is an integral structure, which is conducive to improving the structural strength of the current collecting plate 10.

[0066] When the connecting groove 110 is not completely through the disc body 100, the thickness of the connecting portion 200 can be designed to be slightly thinner, so that the thickness of the connecting portion 200 matches the groove depth of the connecting groove 110, ensuring that after the connecting portion 200 is bent into the connecting groove 110, the overall thickness of the current collecting plate 10 and the original thickness of the current collecting plate 10 remain the same.

[0067] Alternatively, in other embodiments, referring to Figures 1 to 4 , the connecting groove 110 penetrates the disc body 100 along the thickness direction of the disc body 100. In other words, the connecting groove 110 can be a structure that penetrates the disc body 100.

[0068] Specifically, in the present embodiment, when laser welding the current collecting plate 10 and the tab, since the connecting groove 110 completely penetrates the disc body 100, the laser can maximize the energy delivered to the contact surface of the current collecting plate 10 and the tab through the connecting groove 110, further improving the welding efficiency and quality between the current collecting plate 10 and the tab. At the same time, the connecting groove 110 adopts the above structure, which is conducive to reducing the processing difficulty of the current collecting plate 10.

[0069] When the connecting groove 110 completely penetrates the disc body 100, the thickness of the connecting portion 200 can be designed to be slightly thicker (at this time, the connecting portion 200 has higher structural strength and can bear greater load), so that the thickness of the connecting portion 200 matches the groove depth of the connecting groove 110, ensuring that the connecting portion 200 can be completely filled into the connecting groove 110 after being bent, so that the overall thickness of the current collecting plate 10 after the connecting portion 200 is bent and the original thickness of the current collecting plate 10 remain the same.

[0070] In some embodiments, referring to Figures 1 to 4 , the connecting portion 200 can be bent towards one side of the disc body 100, and the side of the disc body 100 away from the connecting portion 200 is the connecting surface 120, which is adapted to contact the tab of the battery cell. The disc body 100 is provided with a protruding portion 121 at the connecting surface 120. For example, the protruding portion 121 can be formed on the connecting surface 120 of the disc body 100 by stamping forming processing.

[0071] Specifically, in the embodiment, when the current collecting plate 10 and the tab are buckled, the connecting surface 120 of the current collecting plate 10 contacts the tab. Since the connecting surface 120 is provided with the protruding portion 121 which protrudes away from the disc body 100, the protruding portion 121 can abut against the tab, thereby increasing the contact area between the current collecting plate 10 and the tab, ensuring the welding quality and strength between the current collecting plate 10 and the tab, and preventing the occurrence of virtual welding between the current collecting plate 10 and the tab, which can result in poor welding between the current collecting plate 10 and the tab and affect the performance of the cylindrical battery.

[0072] In some embodiments, referring to Figures 1 to 4 , the disc body 100 is provided with a welding surface 130 on the side close to the connecting portion 200. The welding surface 130 is oppositely arranged with the connecting surface 120, and the disc body 100 is provided with a recessed portion 131 on the welding surface 130. The recessed portion 131 is oppositely arranged with the protruding portion 121. For example, the recessed portion 131 can be formed on the welding surface 130 of the disc body 100 by stamping. When the press applies an external force to the welding surface 130 of the disc body 100, a pit will be generated on the welding surface 130, thereby forming the recessed portion 131 on the welding surface 130. At the same time, a protruding structure will be generated on the connecting surface 120 relative to the position of the pit, thereby forming the protruding portion 121 on the connecting surface 120. The above structure is advantageous in reducing the processing difficulty of the protruding portion 121 and the recessed portion 131 and improving the processing efficiency of the current collecting plate 10.

[0073] Specifically, in the embodiment, when the current collecting plate 10 and the tab are laser welded, the laser is irradiated on the welding surface 130 of the current collecting plate 10, and more preferably, the laser can be irradiated on the recessed portion 131 of the welding surface 130. Since the recessed portion 131 is closer to the tab, the energy of the laser can be more effectively transmitted to the connecting surface 120 (and more preferably to the protruding portion 121) through the recessed portion 131, thereby improving the welding strength and quality between the current collecting plate 10 and the tab and reducing the welding difficulty between the current collecting plate 10 and the tab.

[0074] In some embodiments, referring to Figure 4 , the connecting portion 200 and the connecting groove 110 have a connecting end 210 therebetween. The vertical distance H between the connecting end 210 and the edge position of the disc body 100 satisfies: 2mm≤H≤1 / 3R. The width W of the connecting portion 200 satisfies: 5mm≤W≤1 / 2R. Wherein, R is the diameter of the current collecting plate 10. It should be noted that the specific values of H and W can be adaptively limited according to the size of the current collecting plate 10.

[0075] Specifically, in the embodiment, since the connecting portion 200 is also used to connect other structures, for example, the connecting portion 200 is also used to connect a cover plate and the like, the connecting portion 200 needs to have a certain connection strength. The vertical distance between the connecting end 210 of the connecting portion 200 and the edge position of the disc body 100 is set within the above range, which is beneficial to improve the connection strength between the connecting portion 200 and the disc body 100, prevent the connecting portion 200 from falling off from the disc body 100 when being bent (specifically corresponding to the case that the vertical distance between the connecting end 210 of the connecting portion 200 and the edge position of the disc body 100 is too small), or prevent the volume of the connecting portion 200 from being too small to cause insufficient supporting strength (specifically corresponding to the case that the vertical distance between the connecting end 210 of the connecting portion 200 and the edge position of the disc body 100 is too large), thereby ensuring the connection stability between the cover plate and the like and the current collecting disc 10. The width of the connecting portion 200 is set within the above range, which is beneficial to improve the bearing capacity of the connecting portion 200, so that the connecting portion 200 can bear greater load and ensure that the connecting portion 200 can provide effective support for the cover plate and the like. In addition, setting the width of the connecting portion 200 within the above range is also beneficial to improve the electrical conductivity of the current collecting disc 10, so as to ensure that the cylindrical battery using the current collecting disc 10 provided in the embodiment will not cause thermal runaway risk due to temperature rise during charging and discharging.

[0076] In some embodiments, the disc body 100 and the connecting portion 200 are a stamping integrated structure.

[0077] Specifically, in the embodiment, the above processing method is simple and easy to form the current collecting disc 10. On the one hand, the disc body 100 and the connecting portion 200 are an integrated stamping inward structure, so that the disc body 100 and the connecting portion 200 do not need to be additionally welded, thereby reducing the processing steps of the current collecting disc 10, improving the processing efficiency of the current collecting disc 10, and ensuring the connection strength between the disc body 100 and the connecting portion 200. On the other hand, the disc body 100 and the connecting portion 200 do not need an additional flexible connecting structure, thereby being able to save the raw materials required for processing the current collecting disc 10 and reduce the processing cost of the current collecting disc 10.

[0078] In some embodiments, referring to Figures 1 to 4 The disc body 100 of the current collecting disc 10 is provided with a liquid injection hole 140. Through the liquid injection hole 140, electrolyte can be injected into the cylindrical battery, so as to ensure that the battery cell of the cylindrical battery is immersed in the electrolyte, thereby realizing the charging and discharging of the cylindrical battery.

[0079] Correspondingly, the utility model also provides another embodiment of a cover plate assembly 20, referring to Figures 5 to 7The cover plate assembly 20 includes the current collecting plate 10, the cover 300 and the pole 400 in any of the above embodiments. The connecting part 200 of the current collecting plate 10 has a connecting end 210 between the connecting groove 110 and the connecting part 200. The first connecting hole 220 is arranged at the end of the connecting part 200 away from the connecting end 210. The cover 300 is provided with a second connecting hole 310, and the second connecting hole 310 and the first connecting hole 220 are arranged correspondingly. The pole 400 is sequentially arranged in the second connecting hole 310 and the first connecting hole 220.

[0080] Specifically, in the embodiment, the connecting part 200 can connect the cover 300 to the current collecting plate 10. Before the current collecting plate 10 and the tab are welded, the connecting part 200 is in the first bending state, at this time, the connecting part 200 drives the cover 300 to be raised in the direction away from the current collecting plate 10, so that the connecting groove 110 is exposed. When the current collecting plate 10 and the tab are welded by using laser, the energy of the laser can be quickly and uniformly transmitted to the contact surface of the current collecting plate 10 and the tab through the connecting groove 110, so as to realize the efficient welding between the current collecting plate 10 and the tab. The bending of the connecting part 200 to the first bending state makes the cover 300 be raised, which does not affect the laser welding of the current collecting plate 10.

[0081] After the current collecting plate 10 and the tab are welded, the connecting part 200 is pressed to change from the first bending state to the second bending state, at this time, the connecting part 200 drives the cover 300 to be folded in the direction close to the current collecting plate 10, so that the connecting part 200 is filled into the connecting groove 110, and the cover 300 is buckled outside the current collecting plate 10, and the pole 400 and the tab are in contact. When the connecting part 200 is in the second bending state, the connecting part 200 can be completely accommodated in the connecting groove 110, so as to eliminate the influence of the thickness of the connecting part 200 on the overall thickness of the current collecting plate 10, so that the overall thickness of the current collecting plate 10 after the bending of the connecting part 200 is consistent with the overall thickness of the original single-layer current collecting plate 10 before the bending of the connecting part 200, that is, the thickness of the current collecting plate 10 is not increased, thereby being beneficial to saving the internal space of the cylindrical battery, and the saved internal space can be used for the design of the battery cell to improve the battery capacity and energy density of the cylindrical battery. At the same time, the cover 300 can be used to protect the current collecting plate 10, prevent the structure of the current collecting plate 10 from being damaged, and ensure the safety of the cylindrical battery.

[0082] In some embodiments, referring to Figures 5 to 7 The first insulating pad 500 is arranged between the cover 300 and the connecting part 200, and the first insulating pad 500 is used to separate the cover 300 and the current collecting plate 10. The second insulating pad 600 is arranged between the pole 400 and the cover 300, and the second insulating pad 600 is used to separate the pole 400 and the cover 300. The first insulating pad 500 and the second insulating pad 600 can adopt an insulating plastic structure or an insulating rubber structure.

[0083] Specifically, in the embodiment, since the cover body 300 is negatively charged and the current collector 10 is positively charged, by arranging the first insulating pad 500 and the second insulating pad 600, the risk of short circuit caused by the direct contact between the cover body 300 and the current collector 10 or the direct contact between the pole 400 and the cover body 300 can be effectively prevented.

[0084] Correspondingly, the utility model also provides another embodiment of a cylindrical battery, which comprises the cover plate assembly 20, the shell and the battery cell in any of the above embodiments. The shell is provided with a receiving cavity, and the battery cell is arranged in the receiving cavity. The battery cell is provided with a tab at one end. The cover plate assembly 20 is connected to the end of the shell close to the tab, and is welded between the cover plate assembly 20 and the tab. Specifically, the current collector 10 in the cover plate assembly 20 is welded between the current collector 10 and the tab.

[0085] Specifically, in the embodiment, the cover plate assembly 20 is thin and has a small thickness. The cylindrical battery using the cover plate assembly 20 can save space in the receiving cavity, so that a battery cell with a larger volume can be accommodated in the receiving cavity, thereby facilitating the increase of the battery capacity and the energy density of the cylindrical battery.

[0086] Thanks to the improvement of the current collector 10, the cover plate assembly 20 and the cylindrical battery of the embodiment have the same technical effects as the current collector 10, which will not be described here.

[0087] It should be noted that the other contents of the current collector 10, the cover plate assembly 20 and the cylindrical battery disclosed in the utility model can be referred to the prior art, which will not be described here.

[0088] The above is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model. Any equivalent structural transformation made by referring to the utility model specification and the drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A current collector plate, characterized by, include: The disc body has a connecting groove. A connecting part, one end of which is connected to the connecting groove, the connecting part having a first bent state and a second bent state relative to the disc body, the connecting part being disengaged from the connecting groove in the first bent state, and the connecting part being completely accommodated in the connecting groove in the second bent state; The connecting portion is configured to bend toward the disk body, so that the connecting portion changes from the first bending state to the second bending state; The connecting part and the connecting groove have a connecting end, and the vertical distance H between the connecting end and the edge of the disk body satisfies: 2mm≤H≤1 / 3R; Wherein, R is the diameter of the collector disk.

2. The current plate of claim 1, wherein Along the thickness direction of the disk body, the thickness of the disk body at the connecting groove is less than the thickness of the disk body at the non-connecting groove; Alternatively, the connecting groove extends through the disk body along its thickness direction.

3. The current plate of claim 1, wherein The side of the disc body away from the connecting part is the connecting surface, which is adapted to contact the electrode tab of the battery cell, and the disc body has a protrusion on the connecting surface.

4. The current plate of claim 3, wherein The side of the disc body near the connecting part is a welding surface, the welding surface is disposed opposite to the connecting surface, and the disc body has a recessed part on the welding surface; The recessed portion is disposed opposite to the protruding portion.

5. The current plate of claim 1, wherein The width W of the connecting part satisfies: 5mm≤W≤1 / 2R; Wherein, R is the diameter of the collector disk.

6. The current collector plate according to any one of claims 1 to 5, wherein The disc body and the connecting part are integrally formed by stamping.

7. A cover assembly characterized by, include: According to any one of claims 1 to 6, the collector plate has a connecting end between the connecting part of the collector plate and the connecting groove, and a first connecting hole is provided at the end of the connecting part away from the connecting end; The cover body is provided with a second connecting hole, which is provided correspondingly to the first connecting hole; The electrode post is sequentially inserted into the second connecting hole and the first connecting hole.

8. The cover plate assembly of claim 7, wherein, A first insulating pad is provided between the cover and the connecting part, and a second insulating pad is provided between the pole and the cover.

9. A cylindrical battery characterized by include: The cover plate assembly as described in claim 7 or 8; A housing, wherein the housing is provided with a receiving cavity; A battery cell, wherein the battery cell is disposed within the receiving cavity, and a tab is provided at one end of the battery cell; The cover plate assembly is connected to one end of the housing near the electrode tab, and the cover plate assembly is welded to the electrode tab.

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