All-tab battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a full-tab battery, which comprises a cell pole group and two groups of cover plate components, the cell pole group is connected with two groups of positive tabs arranged at intervals, two groups of negative tabs arranged at intervals and two exhaust passages, the positive electrode tabs and the negative electrode tabs are respectively arranged at two ends of the battery cell pole group and are connected with the battery cell pole group; the two exhaust passages are respectively arranged between the two groups of positive electrode tabs and the two groups of negative electrode tabs; the two groups of cover plate assemblies are respectively arranged at two ends of the battery cell pole group, each cover plate assembly comprises two pole columns, an anti-explosion valve and a cover plate body, the two pole columns are respectively and electrically connected with the positive pole lug and the negative pole lug, at least one pole column is provided with a mounting hole communicated with the exhaust channel, the anti-explosion valve is arranged corresponding to the position of the mounting hole, and the cover plate body is arranged on the anti-explosion valve. And the cover plate body is connected with the pole. Therefore, the explosion-proof valve and the pole are integrally arranged, so that the space of the cover plate is reasonably utilized, the pole is fully contacted with the positive pole lug or the negative pole lug, and the length of the pole lug is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a full tab battery. BACKGROUND

[0002] With the development of new energy vehicles, the safety performance of the battery and the charging rate requirement are also higher and higher.

[0003] The full tab battery is a kind of battery using the tail of current collector as tab, and the battery has low internal resistance and can support high-rate charging and discharging, which can meet the demand of vehicle for fast charging and high-power output.

[0004] In the prior art, the area of the battery cover plate is limited, in order to leave assembly space for other components on the cover plate, the tab is usually cut, so that the full tab design is difficult to realize, in addition, the high-rate charging current is large, and the area of the tab will directly affect the heat generation of the battery cell, if the heat cannot be dissipated in time, not only the charging time will be prolonged, but also the local position of the tab may be overheated, and then the battery cell may be overheated, and the thermal safety problem may be caused. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a full tab battery to solve the problems of small tab area and high temperature rise during high-rate charging and discharging of battery cell.

[0006] To achieve this purpose, the utility model adopts the following technical scheme:

[0007] A full tab battery, comprising: a battery cell pole group, two groups of positive tab, two groups of negative tab and two exhaust channels are connected to the battery cell pole group, the positive tab and the negative tab are respectively arranged at both ends of the battery cell pole group and connected with the battery cell pole group, and the two exhaust channels are respectively arranged between the two groups of positive tab and the two groups of negative tab; two cover plate assemblies, two cover plate assemblies are respectively arranged at both ends of the battery cell pole group, the cover plate assembly comprises a pole, an explosion-proof valve and a cover plate body, two poles are arranged, the two poles are respectively connected with the positive tab and the negative tab, at least one pole is provided with a mounting hole communicated with the exhaust channel, the explosion-proof valve is arranged at the position corresponding to the mounting hole, and the cover plate body is connected with the pole.

[0008] Preferably, the shape of the mounting hole is matched with the shape of the explosion-proof valve, so that the explosion-proof valve is embedded in the mounting hole and fixedly connected with the pole.

[0009] Preferably, the length of the positive electrode tab ranges from 20mm to 500mm, and the single-side width of the positive electrode tab ranges from 2mm to 200mm; and / or, the length of the negative electrode tab ranges from 20mm to 500mm, and the width of the negative electrode tab ranges from 2mm to 200mm.

[0010] Preferably, the width of the explosion-proof valve is less than the width of the exhaust passage.

[0011] Preferably, the width of the explosion-proof valve is D, the length of the explosion-proof valve is L, and 0.1≤D / L≤1 is satisfied.

[0012] Preferably, the sectional area of the mounting hole is less than the sectional area of the exhaust passage.

[0013] Preferably, the pole post comprises a protruding portion and a connecting portion, the protruding portion is arranged on the side of the connecting portion away from the electrode group of the battery cell, and the explosion-proof valve is arranged on the protruding portion.

[0014] Preferably, the cover plate assembly further comprises an outer insulating layer and an inner insulating layer, the outer insulating layer is arranged on the side of the cover plate body away from the electrode group of the battery cell, and the inner insulating layer is arranged on the side of the cover plate body facing the electrode group of the battery cell.

[0015] Preferably, the cover plate assembly further comprises a sealing ring, and the sealing ring is arranged on the cover plate body.

[0016] The utility model discloses beneficial effects:

[0017] A full-tab battery comprises an electrode group of battery cell and two cover plate assemblies, the electrode group of battery cell is connected with two groups of positive electrode tabs arranged at intervals, two groups of negative electrode tabs arranged at intervals and two exhaust passages, the positive electrode tabs and the negative electrode tabs are arranged at two ends of the electrode group of battery cell and connected with the electrode group of battery cell respectively, and the two exhaust passages are arranged between the two groups of positive electrode tabs and between the two groups of negative electrode tabs respectively; the two cover plate assemblies are arranged at two ends of the electrode group of battery cell respectively, the cover plate assembly comprises a pole post, an explosion-proof valve and a cover plate body, two pole posts are arranged, the two pole posts are electrically connected with the positive electrode tabs and the negative electrode tabs respectively, at least one pole post is provided with a mounting hole communicated with the exhaust passage, the explosion-proof valve is arranged at the position corresponding to the mounting hole, and the cover plate body is connected with the pole post.

[0018] Therefore, the explosion-proof valve is arranged in the mounting hole, the pole column is arranged in an integrated mode with the explosion-proof valve, the cover plate space can be reasonably utilized, the area of the pole column is increased, the contact area of the positive pole tab and the negative pole tab and the pole column is further increased, the length of the positive pole tab and the length of the negative pole tab can be as long as possible, the full-pole-tab design is realized, the battery internal resistance and the high-rate charging and discharging temperature rise of the battery pole group are reduced, the over-temperature of the battery pole group is avoided, and the thermal safety problem is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a first exploded view of a full-pole-tab battery in an embodiment of the present application;

[0020] Figure 2 is a second exploded view of a full-pole-tab battery in an embodiment of the present application;

[0021] Figure 3 is a side view of a battery pole group in an embodiment of the present application;

[0022] Figure 4 is a structural schematic view of a pole column and an explosion-proof valve in an embodiment of the present application;

[0023] Figure 5 is a side view of a cover plate assembly in an embodiment of the present application;

[0024] Figure 6 is a structural schematic view of a full-pole-tab battery in an embodiment of the present application;

[0025] Figure 7 is a partial structural schematic view of a full-pole-tab battery in an embodiment of the present application.

[0026] In the drawings:

[0027] 1, battery pole group; 11, positive pole tab; 12, negative pole tab; 13, exhaust passage; 14, battery shell; 2, cover plate assembly; 21, pole column; 211, mounting hole; 212, protruding part; 213, connecting part; 22, explosion-proof valve; 23, cover plate body; 231, liquid injection port; 24, outer insulation layer; 25, inner insulation layer; 26, connecting plate; 27, sealing ring. DETAILED DESCRIPTION

[0028] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, and not to limit the present application. In addition, it should be noted that, in order to facilitate description, only the parts related to the present application are shown in the drawings, rather than all the structures.

[0029] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two element's mutual action relation. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to specific circumstances.

[0030] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional feature between them. Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature. The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0031] In the description of the embodiment, the terms "on", "under", "right", etc. orientation or positional relationship is based on the orientation or positional relationship shown in the drawing, just for the convenience of description and simplification operation, and not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are just used to distinguish in the description, and have no special meaning.

[0032] Referring to Figure 1 And Figure 2 The utility model provides a full tab cell, including electric core pole group 1 and two sets of cover plate subassembly 2, electric core pole group 1 is connected with two sets of interval arrangement's positive pole tab 11, two sets of interval arrangement's negative pole tab 12 and two exhaust passages 13, and the positive pole tab 11 and the negative pole tab 12 are arranged at the both ends of the electric core pole group 1 and are connected with the electric core pole group 1, and the two exhaust passages 13 are arranged between the two sets of positive pole tabs 11 and the two sets of negative pole tabs 12 respectively, two sets of cover plate subassembly 2 are arranged at the both ends of the electric core pole group 1, and the cover plate subassembly 2 includes pole 21, explosion -proof valve 22 and cover plate body 23, two pole 21 are arranged, two pole 21 are electrically connected with the positive pole tab 11, the negative pole tab 12 respectively, at least one pole 21 is provided with the mounting hole 211 that communicates with the exhaust passage 13, and the explosion -proof valve 22 is arranged at the position corresponding to the mounting hole 211, and the cover plate body 23 is fixedly connected with the pole 21.

[0033] Referring to Figure 2 And Figure 3In the embodiment, the cell pole group 1 further comprises a cell shell 14 sleeved on the cell pole group 1, a plurality of positive pole tabs 11 are included in the group of positive pole tabs 11, a plurality of negative pole tabs 12 are included in the group of negative pole tabs 12, the width of each group of positive pole tabs 11 is the same as the width of the negative pole tabs 12, the length of the positive pole tabs 11 is H, the single-side width of the positive pole tabs 11 is h (i.e., the width of a single group of positive pole tabs 11), the width of the exhaust channel 13 is greater than the single-side width h of the group of positive pole tabs 11, the gap between the two groups of positive pole tabs 11 forms the exhaust channel 13 arranged at one end of the cell pole group 1, the gap between the two groups of negative pole tabs 12 forms the exhaust channel 13 arranged at the other end of the cell pole group 1, the pole posts 21, the explosion-proof valves 22 and the cover plate bodies 23 in the two groups of cover plate assemblies 2 are symmetrically arranged at the two ends of the cell pole group 1, and mounting holes 211 are formed in the two pole posts 21, and two explosion-proof valves 22 are correspondingly arranged, and the two explosion-proof valves 22 are arranged between the two groups of positive pole tabs 11 and between the two groups of negative pole tabs 12, and the explosion-proof valves 22 are fixedly connected with the pole posts 21 by welding.

[0034] In this way, by arranging the explosion-proof valves 22 in the mounting holes 211, the integration of the pole posts 21 and the explosion-proof valves 22 is realized, the space of the cover plate bodies 23 can be reasonably utilized, the area of the pole posts 21 can be larger, and the length of the pole tabs can be infinitely close to the height of the cell pole group 1, the full-tab design is realized, which is beneficial to reduce the battery internal resistance, reduce the high-rate charge and discharge temperature rise of the cell pole group 1, avoid over-temperature of the cell pole group 1 and cause thermal safety problems.

[0035] It can be understood that the explosion-proof valves 22 can also be one and connected with one of the pole posts 21, and the number of the explosion-proof valves 22 can be adjusted according to actual design needs, which will not be enumerated here; the length H of the positive pole tabs 11 can be adjusted according to the current size of the charge and discharge of the cell pole group 1, and the length H of the positive pole tabs 11 can be equal to the height of the cell pole group 1 at most, and the single-side width h of the positive pole tabs 11 can be adjusted according to the electric quantity of the cell pole group 1 and the thickness of the cell pole group 1. See Figure 4 In some embodiments, the shape of the mounting hole 211 is matched with the shape of the explosion-proof valve 22, so that the explosion-proof valve 22 is embedded in the mounting hole 211 and fixedly connected with the pole post 21. The mounting hole 211 is a waist-shaped hole, and the edge of the explosion-proof valve 22 is welded with the hole wall of the mounting hole 211.

[0036] In this way, by embedding the explosion-proof valves 22 in the mounting holes 211, the space of the cover plate bodies 23 can be effectively utilized, the pole posts 21 can have sufficient length to realize electrical connection with the positive pole tabs 11 or the negative pole tabs 12 of the full-tab design, so that the pole tabs do not need to be cut when assembling the battery, the area of the pole tabs is as large as possible, the internal resistance is reduced, the high-rate charge and discharge temperature rise of the cell pole group 1 is reduced, the local overheating of the pole tabs is avoided, and the safety of the full-tab battery is improved.

[0037] It can be understood that the explosion-proof valve 22 is embedded in the mounting hole 211, and the end face of the explosion-proof valve 22 away from the electrode group 1 of the battery cell can be flush with the end face of the pole 21 away from the electrode group 1 of the battery cell, or can be higher or lower than the pole 21. The thickness of the explosion-proof valve 22 and the thickness of the pole 21 can be adjusted according to actual needs, and the explosion-proof valve 22 can be embedded in the pole 21, which will not be described here.

[0038] Further, referring to Figure 2 and Figure 3 In some embodiments, the length H of the positive electrode tab 11 ranges from 20 mm to 500 mm, and the single-side width h of the positive electrode tab 11 ranges from 2 mm to 200 mm. The length of the negative electrode tab 12 ranges from 20 mm to 500 mm, and the single-side width of the negative electrode tab 12 ranges from 2 mm to 200 mm.

[0039] In this embodiment, the length H of the positive electrode tab 11 can be any value between 20 mm and 500 mm or a range between any two values, such as 20 mm, 50 mm, 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, 350 mm, 400 mm, 450 mm, etc. The single-side width h of the positive electrode tab 11 can be any value between 2 mm and 200 mm or a range between any two values, such as 2 mm, 10 mm, 25 mm, 50 mm, 100 mm, 150 mm, 200 mm, etc. The length of the negative electrode tab 12 can be any value between 20 mm and 500 mm or a range between any two values, such as 20 mm, 50 mm, 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, 350 mm, 400 mm, 450 mm, etc. The width of the negative electrode tab 12 can be any value between 2 mm and 200 mm or a range between any two values, such as 2 mm, 10 mm, 25 mm, 50 mm, 100 mm, 150 mm, 200 mm, etc. In this way, the positive electrode tab 11 and the negative electrode tab 12 can have sufficient length and width to increase the area of the tabs, achieve full-tab design, save the step of cutting the tabs, reduce internal resistance, avoid overheating of the local position of the tabs, and improve the safety of the full-tab battery.

[0040] It can be understood that the length of the positive electrode tab 11 and the negative electrode tab 12 cannot be too long, as this would result in insufficient space on the cover plate body 23 to install the positive electrode tab 11 and the negative electrode tab 12. The length of the positive electrode tab 11 and the negative electrode tab 12 also cannot be too short, as this would reduce the area of the tabs. The width of the positive electrode tab 11 and the negative electrode tab 12 cannot be too long, as this would narrow the exhaust channel 13 and affect the exhaust efficiency. The width of the positive electrode tab 11 and the negative electrode tab 12 also cannot be too short, as this would affect the flow capacity of the tabs.

[0041] Referring to Figure 3 and Figure 4 In some embodiments, the length direction of the pole column 21 is parallel to the length direction of the exhaust passage 13.

[0042] In this embodiment, the length direction of the pole column 21 is parallel to the length direction of the cover plate body 23, that is, the pole column 21, the exhaust passage 13, the cover plate body 23, the positive electrode tab 11, and the negative electrode tab 12 all extend along the height direction of the battery cell pole group 1, the cover plate body 23 is provided with holes (not shown in the figure) for the positive electrode tab 11 or the negative electrode tab 12 to pass through, and the pole column 21 is arranged through the cover plate body 23.

[0043] In this way, since the pole column 21 has sufficient space for electrical connection with the positive electrode tab 11 or the negative electrode tab 12, the positive electrode tab 11 and the negative electrode tab 12 can have a longer length, and the heat generation of the battery cell pole group 1 is reduced, thereby avoiding over-temperature of the battery cell pole group 1; the pole column 21 is arranged in parallel with the exhaust passage 13, which can increase the contact area between the positive electrode tab 11 or the negative electrode tab 12 and the pole column 21, so that the pole column 21 and the battery cell pole group 1 achieve stable electrical connection, the heat transfer path is optimized, and the local position of the positive electrode tab 11 and the negative electrode tab 12 is prevented from overheating; and the exhaust passage 13 extends along the height of the battery cell pole group 1, which can make the exhaust passage 13 have sufficient length, so that when the battery cell pole group 1 is in thermal runaway, the internal gas can be quickly guided to the explosion-proof valve 22 and discharged through the explosion-proof valve 22, thereby improving the exhaust efficiency.

[0044] Referring to Figure 5 In some embodiments, the width of the explosion-proof valve 22 is D, the length of the explosion-proof valve 22 is L, and 0.1≤D / L≤1 is satisfied.

[0045] In this way, while maintaining the normal operation of the explosion-proof valve 22, the explosion-proof valve 22 and the pole column 21 are stably connected, the pole column 21 and the pole tab have sufficient contact area, the internal resistance is reduced, the local overheating of the positive electrode tab 11 and the negative electrode tab 12 during high-rate charging is avoided, the pole column 21 has sufficient structural strength, and the stability and safety of the battery are improved.

[0046] It can be understood that the width D of the explosion-proof valve 22 and the length L of the explosion-proof valve 22 can be adjusted according to the capacity and system of the battery cell pole group 1, and the larger the capacity and the higher the runaway energy, the larger the area of the explosion-proof valve 22, which will not be described here.

[0047] Referring to Figure 3 and Figure 5 In some embodiments, the width D of the explosion-proof valve 22 is smaller than the width of the exhaust passage 13.

[0048] In this embodiment, the length L of the explosion-proof valve 22 is less than the length of the exhaust passage 13, that is, the outer edge projection of the explosion-proof valve 22 is located inside the outer edge projection of the exhaust passage 13 along the thickness direction of the pole 21.

[0049] In this way, when the explosion-proof valve 22 is embedded in the mounting hole 211, the pole 21 can reserve sufficient space for welding with the explosion-proof valve 22, and the cross-sectional area of the pole 21 can be increased, thereby increasing the contact area of the pole 21 with the positive electrode tab 11 or the negative electrode tab 12, achieving full-tab design, enabling the tabs to be connected to the cover assembly 2 without cutting, fully utilizing the space of the cover body 23, reducing the high-rate charge and discharge temperature rise of the battery pole group 1, avoiding local overheating of the positive electrode tab 11 and the negative electrode tab 12 during high-rate charging, and improving the safety performance of the full-tab battery.

[0050] Referring to Figure 2 and Figure 3 In some embodiments, the cross-sectional area of the mounting hole 211 is less than the cross-sectional area of the exhaust passage 13, that is, the projection of the mounting hole 211 is located inside the projection of the exhaust passage 13 along the thickness direction of the pole 21.

[0051] In this way, when the battery pole group 1 experiences thermal runaway, the gas is discharged through the exhaust passage 13 with a larger cross-sectional area to the mounting hole 211 with a smaller cross-sectional area, which can concentrate the gas on the explosion-proof valve 22, enabling the explosion-proof valve 22 to quickly discharge and achieve pressure relief, improving the exhaust efficiency, and increasing the contact area of the pole 21 with the positive electrode tab 11 and the negative electrode tab 12, making the length of the positive electrode tab 11 and the negative electrode tab 12 as long as possible, achieving full-tab design, optimizing the overall structural layout of the full-tab battery, improving the heat dissipation capacity of the full-tab battery, and reducing the high-rate charge and discharge temperature rise of the battery pole group 1.

[0052] Referring to Figure 2 In some embodiments, the pole 21 includes a protruding portion 212 and a connecting portion 213, the protruding portion 212 is arranged on the side of the connecting portion 213 away from the battery pole group 1, and the explosion-proof valve 22 is arranged on the protruding portion 212.

[0053] In this embodiment, the protruding portion 212 and the connecting portion 213 are integrally formed, and the mounting hole 211 is arranged through the protruding portion 212 and the connecting portion 213 to communicate with the exhaust passage 13, the connecting portion 213 is connected with the cover body 23 to fix the relative position of the pole 21 and the cover body 23, and the two connecting portions 213 arranged at both ends of the battery pole group 1 are electrically connected with the positive electrode tab 11 and the negative electrode tab 12, respectively.

[0054] In this way, the protruding portion 212 has sufficient thickness for embedding the explosion-proof valve 22 in the mounting hole 211, so that the explosion-proof valve 22 can be stably connected with the pole 21, which not only enhances the sealing performance of the cover plate assembly 2, but also enables rapid exhaust when the battery cell pole group 1 is in thermal runaway, thereby improving the safety performance of the full-tab battery.

[0055] Referring to Figure 4 and Figure 5 In some embodiments, the explosion-proof valve 22 is arranged at the center of the protruding portion 212, that is, the explosion-proof valve 22 is located at the middle of the protruding portion 212. In this embodiment, the explosion-proof valve 22 is symmetrically arranged along the length direction and the width direction of the pole 21.

[0056] In this way, the exhaust passage 13 serves as an auxiliary passage for heat diffusion, which can quickly guide the internal gas to the explosion-proof valve 22 when the battery cell pole group 1 is in thermal runaway. The explosion-proof valve 22 is arranged at the center of the protruding portion 212, which can enable the gas to fully and uniformly contact the explosion-proof valve 22 and quickly exhaust the internal gas, thereby improving the exhaust fluency, reducing the internal pressure of the battery cell shell 14, and enhancing the structural stability of the connection between the pole 21 and the cover plate assembly 2, thereby improving the stability and safety of the cover plate assembly 2.

[0057] It can be understood that the explosion-proof valve 22 can also be arranged at the end of the pole 21, and the position of the explosion-proof valve 22 can be adjusted according to actual needs, which will not be described here.

[0058] Referring to Figures 5 to 7 In some embodiments, at least one of the cover plate bodies 23 is provided with a liquid injection port 231, which is arranged at a position spaced apart from the pole 21 along the length direction of the cover plate body 23.

[0059] In this embodiment, the liquid injection port 231 is arranged on the cover plate body 23 connected with the negative tab 12, and the length of the pole 21 connected with the negative tab 12 is less than that of the pole 21 connected with the positive tab 11.

[0060] In this way, the space of the cover plate body 23 can be effectively utilized to arrange the liquid injection port 231 while ensuring that the negative tab 12 has sufficient contact area with the corresponding pole 21, thereby realizing full-tab design without reserving space for the liquid injection port 231 in the battery cell shell 14, and making the structure of the full-tab battery more compact and reasonably utilizing the space of the cover plate body 23.

[0061] It can be understood that the liquid injection port 231 can also be arranged on the cover plate body 23 connected with the positive tab 11, and the position of the liquid injection port 231 can be adjusted according to actual needs, which will not be described here.

[0062] Referring to Figure 1In some embodiments, the cover plate assembly 2 further comprises an outer insulation layer 24 and an inner insulation layer 25, the outer insulation layer 24 is arranged on the side of the cover plate body 23 away from the cell pole group 1, and the inner insulation layer 25 is arranged on the side of the cover plate body 23 facing the cell pole group 1. In this embodiment, the outer insulation layer 24 and the inner insulation layer 25 are fixedly connected with the cover plate body 23, the outer insulation layer 24 is provided with a hole (not shown in the figure) for the pole post 21 to pass through, and the inner insulation layer 25 is provided with a hole (not shown in the figure) for the positive electrode tab 11 or the negative electrode tab 12 to pass through.

[0063] Further, the cover plate body 23 is further connected with a connecting plate 26, the connecting plate 26 is provided with a hole (not shown in the figure) for the pole post 21 to pass through, so as to limit the position of the pole post 21, and the connecting plate 26 provided with the pole post 21 is fixedly arranged at a position of the cover plate body 23, which can increase the overcurrent capacity of the pole post 21 and fix the relative position of the pole post 21 and the cover plate body 23.

[0064] In this way, the double insulation structure of the outer insulation layer 24 and the inner insulation layer 25 can make the positive electrode tab 11 and the negative electrode tab 12 only electrically connected with the external circuit through the pole post 21, improve the safety of the cover plate assembly 2, reduce the occupation of the space of the cover plate body 23, make the overall structure of the cover plate assembly 2 more compact, increase the contact area of the pole post 21 and the positive electrode tab 11 or the negative electrode tab 12, reduce the high-rate charge and discharge temperature rise of the cell pole group 1, and avoid the over-temperature of the cell and the thermal safety problem.

[0065] Referring to Figure 1 In some embodiments, the cover plate assembly 2 further comprises a sealing ring 27, and the sealing ring 27 is arranged on the cover plate body 23.

[0066] In this embodiment, the sealing ring 27 is arranged one by one with the cover plate body 23, and the sealing ring 27 is sleeved on the pole post 21, so that the cover plate assembly 2 has sealing performance and avoids leakage of electrolyte.

[0067] In this way, the sealing ring 27 is sleeved on the pole post 21, which can realize the sealing connection of the pole post 21 and the cover plate body 23, and the welding of the explosion-proof valve 22 and the pole post 21 can realize the sealing connection of the explosion-proof valve 22 and the pole post 21, thereby improving the sealing performance of the cover plate assembly 2 and keeping the pole post 21 having enough space to be electrically connected with the positive electrode tab 11 or the negative electrode tab 12, so that the space of the cover plate body 23 is utilized, the full-tab design is realized, and the high-rate charge and discharge temperature rise of the cell pole group 1 is reduced.

[0068] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is not necessary and also impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claim.

Claims

1. A multi-tab battery, characterized in that, include: A battery cell electrode assembly (1) is connected to two sets of spaced-apart positive electrode tabs (11), two sets of spaced-apart negative electrode tabs (12), and two exhaust channels (13). The positive electrode tabs (11) and the negative electrode tabs (12) are respectively disposed at both ends of the battery cell electrode assembly (1) and connected to the battery cell electrode assembly (1). The two exhaust channels (13) are respectively disposed between the two sets of positive electrode tabs (11) and between the two sets of negative electrode tabs (12). Two sets of cover plate assemblies (2) are respectively disposed at both ends of the battery cell electrode group (1). Each cover plate assembly (2) includes a pole post (21), an explosion-proof valve (22), and a cover plate body (23). There are two pole posts (21), which are electrically connected to the positive electrode tab (11) and the negative electrode tab (12) respectively. At least one pole post (21) has a mounting hole (211) that communicates with the exhaust channel (13). The explosion-proof valve (22) is disposed at the position corresponding to the mounting hole (211). The cover plate body (23) is connected to the pole post (21).

2. The omni-tab battery according to claim 1, characterized in that, The shape of the mounting hole (211) is adapted to the shape of the explosion-proof valve (22) so that the explosion-proof valve (22) is embedded in the mounting hole (211) and fixedly connected to the pole (21).

3. The omni-tab battery according to claim 1, characterized in that, The length of the positive electrode tab (11) ranges from 20mm to 500mm, and the width of one side of the positive electrode tab (11) ranges from 2mm to 200mm; and / or, the length of the negative electrode tab (12) ranges from 20mm to 500mm, and the width of one side of the negative electrode tab (12) ranges from 2mm to 200mm.

4. The omni-tab battery according to claim 1, characterized in that, The width of the explosion-proof valve (22) is smaller than the width of the exhaust channel (13).

5. The omni-tab battery according to claim 1, characterized in that, The explosion-proof valve (22) has a width of D and a length of L, and satisfies 0.1≤D / L≤1.

6. The omni-tab battery according to claim 1, characterized in that, The cross-sectional area of ​​the mounting hole (211) is smaller than the cross-sectional area of ​​the exhaust channel (13).

7. The omni-tab battery according to claim 1, characterized in that, The pole post (21) includes a protrusion (212) and a connecting part (213). The protrusion (212) is located on the side of the connecting part (213) away from the battery cell pole group (1). The explosion-proof valve (22) is located on the protrusion (212).

8. The multi-tab battery according to any one of claims 1-7, characterized in that, At least one of the cover plate bodies (23) is provided with a liquid injection port (231), and the liquid injection port (231) and the pole (21) are spaced apart along the length direction of the cover plate body (23).

9. The multi-tab battery according to any one of claims 1-7, characterized in that, The cover plate assembly (2) further includes an outer insulating layer (24) and an inner insulating layer (25). The outer insulating layer (24) is disposed on the side of the cover plate body (23) away from the cell electrode group (1), and the inner insulating layer (25) is disposed on the side of the cover plate body (23) facing the cell electrode group (1).

10. The multi-tab battery according to any one of claims 1-7, characterized in that, The cover plate assembly (2) further includes a sealing ring (27), which is disposed on the cover plate body (23).

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