Battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell and a battery pack. According to the battery cell, a shell is provided with a cavity and an opening communicated with the cavity; the cover plate is arranged on the opening and seals the cavity; the cover plate is provided with a pair of poles, a pair of through holes and a liquid injection hole, the pair of through holes is located between the pair of poles, and the liquid injection hole is located between the pair of through holes; the plurality of pole groups are arranged in the shell, each pole group is provided with a pair of tabs, and the pair of tabs and the pair of through holes are arranged in a one-to-one correspondence manner; the tab comprises a body and a bent part connected with the body; and the pair of connecting sheets are arranged on the plurality of pole groups, are connected with the pole columns and the pole lugs, are fixed in a space defined by the body and the bending part, and are attached to the lower surface of the bending part. The through holes and the tabs are arranged correspondingly, so that the installation thickness of the pole and the tabs in a connection state is reduced, and the utilization rate of the internal space of the shell is improved; and secondly, the tabs are connected with the connecting sheets through the bending parts, so that the operation difficulty in the connecting process can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to an electric core and a battery pack. Background Art

[0002] The connecting piece in the electric core is a metal piece used to connect the pole column of the electric core and the ear of the pole group. It ensures the smooth flow of current between the pole column and the ear, and realizes the storage and release of electric energy of the electric core.

[0003] However, the method of connecting the connecting piece and the ear adopted in the related art is not only relatively complex in operation, but also occupies more internal space of the electric core. Summary of the Utility Model

[0004] In view of this, the utility model provides an electric core and a battery pack to solve the problems that the connection method between the connecting piece and the ear in the related art is complex and occupies more internal space of the electric core.

[0005] In a first aspect, the utility model provides an electric core, comprising:

[0006] A housing, provided with a cavity and an opening communicating with the cavity;

[0007] A cover plate, arranged on the opening and sealing the cavity; a pair of pole columns, a pair of through holes and a liquid injection hole are arranged on the cover plate. The pair of through holes are located between the pair of pole columns, and the liquid injection hole is located between the pair of through holes;

[0008] A plurality of pole groups, arranged in the housing. A pair of ears are arranged on each pole group, and the pair of ears are arranged in one-to-one correspondence with the pair of through holes; the ear includes a body connected to the pole group and a bent portion bent from the end of the body toward one side;

[0009] A pair of connecting pieces, arranged on the plurality of pole groups, used to connect the pole column and the ear. The connecting piece is fixed in the space defined by the body and the bent portion and is attached to the lower surface of the bent portion.

[0010] Advantageous Effects: By providing an opening communicating with the cavity on the housing, the utility model enables operators to place relevant structures such as pole groups into the housing more simply and quickly. Secondly, to improve the use safety of the electric core, the cover plate is arranged on the opening to effectively seal the housing and reduce the probability of dust and other impurities entering the interior of the electric core; at the same time, to avoid the inconvenience of operators in installing and maintaining the relevant structures inside the housing after the housing is sealed by the cover plate, a pair of through holes are arranged on the cover plate to reserve an operating space for operators and improve the flexibility of installation and maintenance.

[0011] In addition, a pair of pole columns are provided on the cover plate, and the pair of pole columns are connected to the pole tabs on the pole group through a connecting piece, so that the operation of smoothly introducing or leading out current from the battery cell can be successfully completed. Secondly, a pair of through holes are provided between the pair of pole columns, and the through holes are arranged corresponding to the pole tabs. On the one hand, the self-structure of the cover plate can be made more compact, and on the other hand, the misalignment setting of the pole tabs and the pole columns can be realized. By utilizing the space in other directions inside the housing, the installation thickness in the connected state of the pole columns and the pole tabs is reduced, and the utilization rate of the space inside the housing is improved; secondly, the pole tabs are connected to the connecting piece through the bending part, which can reduce the operation difficulty during the connection process.

[0012] In an optional embodiment, the connecting piece includes a pole column connecting part connected to the pole column and a pole tab connecting part connected to the pole tab, and the positions of the pair of pole tab connecting parts correspond to the pair of through holes; the pole tab connecting part is attached to the lower surface of the bending part.

[0013] Beneficial effects: Since the pole tabs and the pole columns in the present utility model are misaligned, the connecting piece is divided into a pole column connecting part and a pole tab connecting part, which can make the position of the connecting piece adapt to the pole tabs and the pole columns, so that the pole tabs and the pole columns can be connected, and the smooth flow of current between the pole tabs and the pole columns can be realized. Further, making the pole tab connecting part fit the lower surface of the bending part can reduce the installation thickness in the connected state of the connecting piece and the pole tabs, improve the utilization rate of the space inside the housing, and thus enable the battery cell to store more energy under the same volume.

[0014] In an optional embodiment, a plurality of notches are provided on the pole tab connecting part, and the plurality of notches are arranged at intervals along the width direction of the housing; a plurality of pole groups are arranged side by side along the width direction of the housing, and two adjacent pole groups form a pair and correspond to one notch; wherein, two adjacent bending parts pass through the corresponding notches and are arranged back to back on the pole tab connecting part.

[0015] Beneficial effects: In the present utility model, by providing a plurality of notches on the connecting piece and making a plurality of bending parts pass through the notches and be connected to the connecting piece, the bending times when the pole tabs on each pole group are connected to the connecting piece can be reduced, and the complexity of the connection method between the two can be reduced. Secondly, arranging a plurality of pole groups side by side along the width direction of the housing can correspond to the arrangement mode of the plurality of notches. Moreover, making two adjacent bending parts pass through the corresponding notches and be arranged back to back on the connecting piece can save the installation space in the width direction of the housing, reduce the length of the through hole, and ensure the structural strength of the side of the housing provided with the through hole.

[0016] In an optional embodiment, a gap is left between one side of the body facing the bending part and the side wall of the notch, and the length of the gap ≥ 0.2 mm.

[0017] Beneficial effects: By limiting the size of the gap length, the utility model can, on the one hand, avoid interference between the tab and the connecting piece, and on the other hand, prevent the connecting piece from tearing the tab.

[0018] In an alternative embodiment, a transition fillet is formed at the connection between the body and the bent portion, and the radius R of the transition fillet is 0.1 mm to 0.3 mm.

[0019] Beneficial effects: By providing a transition fillet at the connection between the body and the bent portion, the utility model can improve the structural strength of the tab and avoid stress concentration problems in the tab. Further limiting the angle of the transition fillet within a relatively reasonable range can avoid excessive occupation of the internal space of the housing.

[0020] In an alternative embodiment, the connection between the body and the electrode group is biased towards one side of the electrode group, and the offset W ≤ 1 / 2T1, where T1 is the thickness of the electrode group and T1 is 6 mm to 30 mm.

[0021] Beneficial effects: By setting the offset W within a reasonable range, the utility model can ensure the flatness of the end face of the bent portion after folding, omit the tab die-cutting process, reduce the use cost and improve the production efficiency.

[0022] In an alternative embodiment, a converging inclined surface is formed at one end of the electrode group connected to the body, and the height h of the converging inclined surface is 0.2 mm to 3.5 mm.

[0023] Beneficial effects: Since the height of the converging inclined surface is determined by the thickness of the electrode group, setting the height of the converging inclined surface within a reasonable range can compact the tab after folding and enable the electrode group to have a certain load-bearing capacity.

[0024] In an alternative embodiment, the thickness T2 of the bent portion is 0.1 mm to 2.5 mm.

[0025] Beneficial effects: By setting the thickness T2 of the bent portion within a reasonable range, the utility model can further save the space in the height direction of the electrode group and improve the space utilization rate of the battery cell.

[0026] In an alternative embodiment, a sealing plate is provided on the cover plate, and the sealing plate seals the through hole.

[0027] Beneficial effects: By using a sealing plate to seal the through hole on the cover plate, the utility model can improve the sealing performance of the battery cell, not only reducing the possibility of external impurities entering the battery cell, but also reducing the probability of electrolyte leakage from the through hole inside the battery cell.

[0028] In a second aspect, the utility model further provides a battery pack, including: a plurality of the above-mentioned battery cells.

[0029] Beneficial effects: Since the above-mentioned battery cells are used in the battery pack of the present utility model, the space utilization rate of the battery pack itself can also be improved. Furthermore, without changing its own volume, the energy density of the battery pack can be increased, the usage time can be extended, or the charging frequency can be reduced. In addition, the battery pack of the present utility model has all the advantages of the above-mentioned battery cells, which will not be elaborated here. Description of the Drawings

[0030] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 Structural schematic diagram of a battery cell according to an embodiment of the present utility model;

[0032] Figure 2 For Figure 1 Cross-sectional structural schematic diagram of the battery cell shown;

[0033] Figure 3 Structural schematic diagram of another battery cell according to an embodiment of the present utility model;

[0034] Figure 4 For Figure 3 Structural schematic diagram of the battery cell shown without the housing and the cover plate installed;

[0035] Figure 5 Structural schematic diagram of yet another battery cell according to an embodiment of the present utility model;

[0036] Figure 6 Structural schematic diagram of a battery cell according to an embodiment of the present utility model without the housing installed;

[0037] Figure 7 For Figure 6 Side view schematic diagram;

[0038] Figure 8 For Figure 7 Partial enlarged schematic diagram of A in;

[0039] Figure 9 Partial structural schematic diagram of the electrode group according to an embodiment of the present utility model.

[0040] Description of the reference numerals:

[0041] 1. Housing; 101. Cavity; 2. Cover plate; 201. Terminal post; 202. Through hole; 203. Liquid injection hole; 3. Electrode group; 301. Tab; 3011. Body; 3012. Bent portion; 3013. Transition fillet; 302. Converging inclined surface; 4. Connecting piece; 401. Terminal post connecting portion; 402. Tab connecting portion; 4021. Notch; 5. Sealing plate. Detailed implementation manners

[0042] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0043] In view of the problem that the connection manner between the connecting piece and the tab in the related art is complex and occupies a relatively large internal space of the battery cell, the present utility model provides a battery cell and a battery pack.

[0044] The following combines Figures 1 to 9 to describe the embodiments of the present utility model.

[0045] According to the embodiments of the present utility model, on the one hand, as Figures 1 to 9 shown, a battery cell is provided, including: a housing 1, a cover plate 2, a plurality of electrode groups 3, and a pair of connecting pieces 4.

[0046] Specifically, the housing 1 is provided with a cavity 101 and an opening communicating with the cavity 101; the cover plate 2 is disposed on the opening and seals the cavity 101; the cover plate 2 is provided with a pair of terminal posts 201, a pair of through holes 202, and a liquid injection hole 203. The pair of through holes 202 are located between the pair of terminal posts 201, and the liquid injection hole 203 is located between the pair of through holes 202; a plurality of electrode groups 3 are disposed in the housing 1, and each electrode group 3 is provided with a pair of tabs 301. The pair of tabs 301 are arranged in one-to-one correspondence with the pair of through holes 202; the tab 301 includes a body 3011 connected to the electrode group 3 and a bent portion 3012 bent from the end of the body 3011 toward one side; a pair of connecting pieces 4 are disposed on the plurality of electrode groups 3 for connecting the terminal posts 201 and the tabs 301. The connecting piece 4 is fixed in the space defined by the body 3011 and the bent portion 3012 and fits with the lower surface of the bent portion 3012.

[0047] The utility model can enable an operator to more simply and quickly place relevant structures, such as a pole group 3, inside the housing 1 by providing an opening on the housing 1 that communicates with the cavity 101. Secondly, to improve the use safety of the battery cell, a cover plate 2 is arranged on the opening to effectively seal the housing 1 and reduce the probability of dust and other impurities entering the interior of the battery cell. Among them, the cover plate 2 can be arranged on the opening of the housing 1 by means of welding, bonding, etc., as long as the cover plate 2 can be fixedly installed on the opening to ensure the stability and sealing performance of the connection between the two. The specific fixing method is not limited to the several listed above. Further, to avoid the inconvenience for the operator to install and maintain the relevant structures inside the housing 1 after the housing 1 is sealed by the cover plate 2, a pair of through holes 202 are arranged on the cover plate 2 to reserve an operating space for the operator and improve the flexibility of installation and maintenance.

[0048] It can be understood that, in order to further increase the operating space of the operator, the pair of through holes 202 on the housing 1 can be combined into one, and the length direction of the through holes 202 can be kept consistent with the length direction of the housing 1. Further, in order to reduce the production difficulty, the shape of the through holes 202 can be set as a rectangle. Among them, the length direction of the above-mentioned through holes 202 is consistent with Figure 1 the direction shown in

[0049] In addition, in order to form a complete power-on loop to smoothly introduce or lead out current from the battery cell, generally, a pair of pole posts 201 need to be arranged on the battery cell. Among them, the pair of pole posts 201 in this embodiment are divided into a positive pole post and a negative pole post, and the pair of pole tabs 301 are divided into a positive pole tab and a negative pole tab. The positive pole post and the positive pole tab are connected by one of the connecting pieces 4 arranged on the pole group 3, and the negative pole post and the negative pole tab are connected by the other connecting piece 4 arranged on the pole group 3. It should be noted that, in order to avoid the short circuit of the positive pole post and the negative pole post, the pair of connecting pieces 4 need to be arranged at intervals.

[0050] As Figure 1 , Figure 3 and Figure 5 shown, since the positive pole post and the negative pole post generally are arranged at intervals along the length direction of the housing 1 on the cover plate 2 at present, arranging the pair of through holes 202 along the length direction of the housing 1 between the pair of pole posts 201 can make the self-structure of the cover plate 2 more compact.

[0051] Further, to solve the problems that the connection method between the connecting piece 4 and the tab 301 is complex and occupies a large amount of internal space of the battery cell, in this embodiment, the through holes 202 are arranged corresponding to the tabs 301, and the tabs 301 and the pole columns 201 are arranged in a staggered manner, that is, the tabs 301 and the pole columns 201 are not on the same vertical plane. In this way, compared with the existing connecting piece 4 and tab 301 both arranged along the axial direction of the pole column 201, by utilizing the space in the length direction of the housing 1, not only can the space occupied by the pole column 201 and the tab 301 in the height direction (axial direction of the pole column) inside the housing 1 in the connected state be reduced, but also the utilization rate of the internal space of the housing 1 can be improved, so that the battery cell can store more energy under the same volume. Secondly, the tab 301 is connected to the connecting piece 4 through the bending portion 3012, which can reduce the operation difficulty when the tab 301 is connected to the connecting piece 4 and can also reduce the occupation of the internal space of the housing 1 when the two are in the connected state.

[0052] It should be noted that the height direction of the above-mentioned housing 1 is consistent with Figure 1 the direction shown in

[0053] According to an embodiment of the present invention, as shown in Figure 4 and Figure 6 shown, the connecting piece 4 includes a pole column connecting portion 401 connected to the pole column 201 and a tab connecting portion 402 connected to the tab 301. A pair of tab connecting portions 402 correspond to the positions of a pair of through holes 202; the tab connecting portion 402 is attached to the lower surface of the bending portion 3012. Since the tabs 301 and the pole columns 201 in this embodiment are arranged in a staggered manner, the connecting piece 4 is divided into the pole column connecting portion 401 and the tab connecting portion 402, which can adapt the position of the connecting piece 4 to the tabs 301 and the pole columns 201, so that the tabs 301 and the pole columns 201 can be connected, and the smooth flow of current between the tabs 301 and the pole columns 201 can be realized. Further, making the tab connecting portion 402 attached to the lower surface of the bending portion 3012 can reduce the installation thickness of the connecting piece 4 and the tab 301 in the connected state, improve the utilization rate of the internal space of the housing 1, and thus enable the battery cell to store more energy under the same volume.

[0054] Since there are multiple pole groups 3 provided in the battery cell provided by the present invention, in order to reduce the number of bends when the tabs 301 on each pole group 3 are connected to the connecting piece 4 and reduce the complexity of the connection method between the two. In one embodiment, as shown in Figure 4 and Figure 6 shown, a plurality of notches 4021 are provided on the tab connecting portion 402, and a plurality of bending portions 3012 pass through the notches 4021 and are connected to the upper surface of the tab connecting portion 402.

[0055] Further, to facilitate the correspondence between the tab 301 on the electrode group 3 and the notch 4021 on the connecting piece 4, as Figure 4 and Figure 6 shown, a plurality of notches 4021 can be arranged at intervals in the width direction of the housing 1, and a plurality of electrode groups 3 can be arranged side by side in the width direction of the housing 1. In addition, to ensure that the operator can connect the tab 301 to the connecting piece 4 through a pair of through holes 202 on the cover plate 2, the shape of the pair of through holes 202 can be set to a rectangle, and the length direction of the rectangle is kept consistent with the width direction of the housing 1. Among them, the width direction of the above-mentioned housing 1 is consistent with the Figure 1 direction shown in

[0056] Furthermore, to save the installation space in the width direction of the cover plate 2, reduce the length of the through hole 202, and ensure the structural strength of the cover plate 2. In the above embodiment, as Figure 4 and Figure 6 shown, two adjacent electrode groups 3 form a pair and correspond to one notch 4021; among them, two adjacent bent portions 3012 pass through the corresponding notch 4021 and are arranged back to back on the connecting piece 4. Among them, the width direction of the above-mentioned cover plate 2 is consistent with the Figure 1 direction shown in

[0057] According to an embodiment of the present invention, as Figures 7 to 9 shown, there is a gap between the side of the body 3011 facing the bent portion 3012 and the side wall of the notch 4021, and the length of the gap ≥ 0.2 mm. By limiting the size of the gap length in this embodiment, on the one hand, interference between the tab 301 and the connecting piece 4 can be avoided, and on the other hand, the connecting piece 4 can be prevented from tearing the tab 301.

[0058] According to an embodiment of the present invention, as Figures 6 to 9 shown, a transition fillet 3013 is formed at the connection between the body 3011 and the bent portion 3012, and the radius R of the transition fillet 3013 is 0.1 mm to 0.3 mm. By providing the transition fillet 3013 at the connection between the body 3011 and the bent portion 3012 in this embodiment, the structural strength of the tab 301 can be increased, and the problem of stress concentration of the tab 301 can be avoided. Further, the angle of the transition fillet 3013 is limited within a relatively reasonable range to avoid excessive occupation of the internal space of the housing 1.

[0059] According to an embodiment of the present invention, as Figures 7 to 9As shown, the connection between the body 3011 and the electrode group 3 is biased towards one side of the electrode group 3, and the offset W ≤ 1 / 2T1, where T1 is the thickness of the electrode group 3, and T1 ranges from 6 mm to 30 mm. In this embodiment, setting the offset W within a reasonable range can ensure the flatness of the end face of the bent portion 3012 after folding, omit the die-cutting process of the tab 301, reduce the usage cost and improve the production efficiency. It should be noted that the end face of the bent portion 3012 is as shown by S in Figure 9

[0060] According to an embodiment of the present invention, as shown in Figures 7 to 9 One end of the electrode group 3 connected to the body 3011 forms a converging inclined surface 302, and the height h of the converging inclined surface 302 ranges from 0.2 mm to 3.5 mm. Since the height of the converging inclined surface 302 is determined by the thickness of the electrode group 3, setting the height of the converging inclined surface 302 within a reasonable range can compact the tab 301 after folding and enable the electrode group 3 to have a certain load-bearing capacity.

[0061] It should be noted that since a converging inclined surface 302 will be formed at one end of the electrode group 3 connected to the body 3011, the position of the tab connection portion 402 in the height direction of the housing 1 will be higher than the position of the terminal connection portion 401 in the height direction of the housing 1.

[0062] According to an embodiment of the present invention, as shown in Figures 7 to 9 One end, the thickness T2 of the bent portion 3012 ranges from 0.1 mm to 2.5 mm. In this embodiment, setting the thickness T2 of the bent portion 3012 within a reasonable range can further save the space in the height direction of the electrode group 3 and improve the space utilization rate of the battery cell.

[0063] In one embodiment, as shown in Figure 9 One end, the height H of the bent portion 3012 relative to the electrode group 3 ranges from 1.5 mm to 5 mm. It can save the space of the battery cell in the height direction of the electrode group 3 to the greatest extent while ensuring the strength and reliability of the bent portion 3012, and improve the space utilization rate of the battery cell.

[0064] According to an embodiment of the present invention, as shown in Figure 1 One end, a sealing plate 5 is provided on the cover plate 2, and the sealing plate 5 seals the through hole 202. In this embodiment, by using the sealing plate 5 to seal the through hole 202 on the cover plate 2, the sealing performance of the battery cell can be improved, and the possibility of external impurities entering the battery cell and the leakage of the electrolyte inside the battery cell can be reduced. In addition, in order to make the self-structure of the cover plate 2 more compact and optimize the structural layout on the cover plate 2, the liquid injection hole 203 can be provided on one of the sealing plates 5. Further, in order to improve the use safety of the battery cell, the explosion-proof valve can also be provided on the other sealing plate 5 to avoid excessive pressure inside the battery cell.

[0065] ​According to an embodiment of the present utility model, on the other hand, a battery pack is further provided, including: a plurality of the above-mentioned battery cells.

[0066] It can be understood that since the battery pack in this embodiment uses the above-mentioned battery cells, it can also improve its own space utilization rate. Furthermore, without changing its own volume, it can improve its energy density, extend its usage time or reduce the charging frequency. In addition, the battery pack of the present utility model has all the advantages of the above-mentioned battery cells, which will not be elaborated here.

[0067] It should be noted that the battery cells in this embodiment can be, but are not limited to, lithium-ion batteries, lithium manganate batteries, and nickel cobalt manganese ternary material batteries. Specifically, taking lithium-ion batteries as an example, the battery pack in this embodiment can be formed by connecting a plurality of lithium-ion batteries in series, or by connecting a plurality of lithium-ion batteries in parallel, or by preparing a plurality of lithium-ion batteries in a series-parallel combination manner. Specific adjustments can be made according to the actual application scenarios and requirements. The present utility model does not make specific limitations in this regard.

[0068] In addition, to achieve the basic functions of the battery pack, the battery pack in this embodiment may further include other necessary modules or components, such as a battery management system, a heat dissipation system, etc. It should be noted that the other necessary modules or components included in the battery pack can be selected from any suitable existing structures. To clearly and briefly illustrate the technical solutions provided in this embodiment, the above parts will not be elaborated here, and the accompanying drawings of the specification have also been correspondingly simplified. However, it should be understood that the scope of the present utility model is not limited thereby.

[0069] Although the embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing, provided with a cavity and an opening communicating with the cavity; A cover plate, disposed on the opening and sealing the cavity; a pair of pole columns, a pair of through holes and a liquid injection hole are provided on the cover plate, the pair of through holes are located between the pair of pole columns, and the liquid injection hole is located between the pair of through holes; A plurality of electrode groups, disposed in the housing, a pair of electrode tabs are provided on each electrode group, and the pair of electrode tabs are arranged in one-to-one correspondence with the pair of through holes; the electrode tab includes a body connected to the electrode group and a bent portion bent from an end of the body toward one side; A pair of connecting pieces, disposed on the plurality of electrode groups, for connecting the pole columns and the electrode tabs, the connecting piece is fixed in the space defined by the body and the bent portion and is attached to the lower surface of the bent portion; The connecting piece includes a pole column connecting portion connected to the pole column and an electrode tab connecting portion connected to the electrode tab, and the pair of electrode tab connecting portions correspond to the positions of the pair of through holes; the electrode tab connecting portion is attached to the lower surface of the bent portion; A transition fillet is formed at the connection between the body and the bent portion, and the radius R of the transition fillet is 0.1 mm to 0.3 mm; One end of the electrode group connected to the body forms a converging inclined surface, and the height h of the converging inclined surface is 0.2 mm to 3.5 mm; The thickness T2 of the bent portion is 0.1 mm to 2.5 mm.

2. The battery cell according to claim 1, characterized in that, A plurality of notches are provided on the electrode tab connecting portion, and the plurality of notches are arranged at intervals in the width direction of the housing; the plurality of electrode groups are arranged side by side in the width direction of the housing, and two adjacent electrode groups are a pair and correspond to one notch; wherein, two adjacent bent portions pass through the corresponding notches and are arranged back to back on the electrode tab connecting portion.

3. The battery cell according to claim 2, wherein, A gap is left between one side of the body facing the bent portion and the side wall of the notch, and the length of the gap ≥ 0.2 mm.

4. The battery cell according to any one of claims 1 to 3, characterized in that, A sealing plate is provided on the cover plate, and the sealing plate seals the through hole.

5. A battery pack, characterized in that, Comprising: A plurality of battery cells according to any one of claims 1 to 4.

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