Battery cell and battery pack

Abstract

The utility model relates to the technical field of battery cells, and discloses a battery cell and a battery pack. Wherein the battery cell comprises a shell, two ends of the shell are provided with openings, one opening is provided with a first cover plate, the first cover plate is provided with a through hole, the other opening is provided with a second cover plate, and the first cover plate and the second cover plate are both provided with pole columns; the pole group is arranged in the shell, the two ends of the pole group are provided with pole lugs, the pole lugs and the corresponding pole columns are arranged in a staggered mode, the pole lug close to the first cover plate comprises a body connected with the pole group and a bent part bent towards one side from the end of the body, and the bent part corresponds to the through hole; and the pair of connecting sheets are arranged in the shell and are respectively arranged at the two ends of the pole group, the connecting sheets are used for connecting the pole columns and the corresponding tabs, and the connecting sheets close to the first cover plate 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 tabs and the poles are arranged in a staggered manner, so that the installation thickness of the poles and the tabs in a connection state is reduced, and the utilization rate of the internal space of the shell is improved.

Description

Technical Field

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

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

[0003] However, the method of connecting the connecting piece and the pole ear adopted in the related art is not only complicated in operation, but also occupies more internal space of the battery cell. Summary of the Utility Model

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

[0005] In the first aspect, the utility model provides a battery cell, comprising:

[0006] A housing with openings at both ends. A first cover plate is provided on one of the openings, and a through hole is provided on the first cover plate. A second cover plate is provided on the other opening, and pole columns are provided on both the first cover plate and the second cover plate;

[0007] A pole group is arranged in the housing and has pole ears at both ends. The pole ears are arranged in a staggered manner with the corresponding pole columns. The pole ear close to the first cover plate includes a body connected to the pole group and a bent portion bent from the end of the body towards one side. The bent portion is arranged corresponding to the through hole;

[0008] A pair of connecting pieces are arranged in the housing and are respectively arranged at both ends of the pole group. The connecting pieces are used to connect the pole columns and the corresponding pole ears. The connecting piece close to the first cover plate is fixed in the space defined by the body and the bent portion and is attached to the lower surface of the bent portion;

[0009] A plastic plate is arranged in the housing and is located between the second cover plate and the pole group. The plastic plate is provided with pole column mounting holes; the pole column on the second cover plate is connected to the corresponding connecting piece by passing through the pole column mounting holes; the plastic plate extends towards the direction away from the second cover plate at opposite ends along its length direction to form flanges.

[0010] Beneficial effects: By providing an opening on the housing that communicates with its interior, the utility model facilitates the assembly of relevant structures such as the electrode group into the housing by the operator, improving the convenience of assembly. Further, the first cover plate and the second cover plate are used to seal the opening, ensuring the tightness of the battery cell, reducing the possibility of external moisture, dust and other impurities entering the interior of the battery cell, ensuring the cleanliness and stability of the internal environment of the battery cell, and thus being conducive to extending the service life of the battery cell. Secondly, the pole column and the pole ear of the utility model are arranged in a dislocation manner, making use of the space in other directions inside the housing. Compared with the existing connection piece and pole ear both arranged along the axial direction of the pole column, the internal space of the housing occupied by the connection piece and the pole ear in the connection state in the height direction (axial direction of the pole column) of the housing is reduced, improving the utilization rate of the internal space of the housing. Thus, the battery cell can store more energy under the same volume. Moreover, the pole ear is connected to the connection piece through a bending part, which can reduce the operation difficulty of connecting the pole ear and the connection piece and also reduce the occupation of the internal space of the housing when they are in the connected state. In addition, since the materials of the first cover plate and the second cover plate can be metal, in order to prevent a short circuit problem between the electrode group and the second cover plate, a plastic plate is arranged between the second cover plate and the electrode group, and the plastic plate's electrical insulation performance can be used to effectively isolate the electrode group from the second cover plate. Further, by providing a flanging on the plastic plate, the anti-deformation ability of the plastic plate can be improved, ensuring that the plastic plate is closely attached to the inner surface of the housing.

[0011] In an optional embodiment, the connection piece includes a pole column connection part connected to the pole column and a pole ear connection part connected to the pole ear.

[0012] Beneficial effects: Since the pole ear and the pole column in the utility model are arranged in a dislocation manner, the connection piece is divided into a pole column connection part and a pole ear connection part, enabling the connection piece to be adapted to the positions of the pole ear and the pole column, thereby connecting the pole ear and the pole column and realizing the smooth flow of current between the pole ear and the pole column.

[0013] In an optional embodiment, a gap is left between the pole ear connection part and the inner wall of the housing extending along its length direction, and the bending part is arranged on the upper surface of the pole ear connection part through the body passing through the gap and the through hole.

[0014] Beneficial effects: Since the lower surface of the bending part needs to be attached to the upper surface of the pole ear connection part, usually a channel opening suitable for the body to pass through needs to be provided on the pole ear connection part if the bending part is to reach the upper surface of the pole ear connection part. However, this will make the self-structure of the pole ear connection part relatively complex and increase the upfront manufacturing cost. Therefore, to solve the above problems, the utility model allows the body to pass through the gap between the pole ear connection part and the inner wall of the housing extending along the length direction and the through hole on the first cover plate, eliminating the need for complex adjustments to the structure of the connection piece and simplifying the self-structure of the connection piece.

[0015] In an alternative embodiment, the through hole is a strip-shaped hole, and the length direction of the strip-shaped hole is consistent with the length direction of the first cover plate.

[0016] Beneficial effects: In the present utility model, the through hole is set as a strip-shaped hole, and the length direction of the through hole is consistent with the length direction of the first cover plate. On the one hand, it can provide a larger operating space for the operator, making the connection operation between the tab and the connecting piece easier and more convenient; on the other hand, it enables the operator to judge the assembly direction of the first cover plate on the housing in a short time, improving the assembly efficiency and reducing the time consumed by the assembly.

[0017] In an alternative embodiment, the length of the tab connecting portion is greater than the length of the through hole.

[0018] Beneficial effects: Limited by the width dimension of the first cover plate itself, the width of the through hole is relatively small. Therefore, in the present utility model, making the length of the tab connecting portion greater than the length of the through hole can increase the connection area between the tab and the tab connecting portion, ensuring the overcurrent capacity of the current.

[0019] In an alternative embodiment, the height of the body is consistent with the thickness of the tab connecting portion.

[0020] Beneficial effects: In the present utility model, making the height of the body in the tab match the thickness of the tab connecting portion. On the one hand, it can make the lower surface of the bent portion closely fit on the connecting piece. In this way, not only can the connection stability between the two be enhanced, but also the contact resistance can be reduced, improving the transmission efficiency of the current between the tab and the terminal; on the other hand, it can make the structure of the connecting piece and the tab more compact in the connected state, reducing the unnecessary occupation of the internal space of the housing.

[0021] In an alternative embodiment, the body is perpendicularly arranged with the bent portion.

[0022] Beneficial effects: In the present utility model, arranging the body of the tab perpendicularly with the bent portion of the tab can make the structure of the tab in the housing more compact, optimize the internal space of the housing, and improve the energy density of the battery cell.

[0023] In an alternative embodiment, the second cover plate is provided with a liquid injection hole and an explosion-proof valve.

[0024] Beneficial effects: In the present utility model, setting the liquid injection hole and the explosion-proof valve on the second cover plate. On the one hand, it can make the structure of the second cover plate itself more compact and optimize the structural layout on the second cover plate; on the other hand, it is convenient to add electrolyte into the battery cell, and at the same time, it can prevent the pressure inside the battery cell from being too high, improving the use safety of the battery cell.

[0025] In an alternative embodiment, a sealing plate is provided on the first cover plate, and the sealing plate is welded to the through hole to seal the through hole.

[0026] Beneficial effects: In the present utility model, the sealing plate is welded to the through hole by welding. On the one hand, the connection strength between the two can be improved, reducing the possibility of the sealing plate falling off during the use of the battery cell; on the other hand, gaps between the sealing plate and the hole wall of the through hole can be avoided, improving the self-sealing performance of the housing and reducing the possibility of external impurities entering the interior of the battery cell.

[0027] In a second aspect, the present utility model also provides a battery pack including: a plurality of the above-mentioned battery cells.

[0028] Beneficial effects: By adopting the above-mentioned battery cells, the battery pack of the present utility model can improve its space utilization rate. Thus, without changing its own volume, it can improve its energy density, extend its service 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 and will not be elaborated herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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 for use in the description of the specific embodiments or the prior art. Obviously, the following drawings 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.

[0030] Figure 1 Partial structural schematic diagram of a battery cell according to an embodiment of the present utility model;

[0031] Figure 2 Partial structural schematic diagram of another battery cell according to an embodiment of the present utility model;

[0032] Figure 3 Connection schematic diagram of a pole group and a connecting piece according to an embodiment of the present utility model;

[0033] Figure 4 Cross-sectional view schematic diagram of a cover plate according to an embodiment of the present utility model;

[0034] Figure 5 For Figure 4 Bottom view schematic diagram of the shown cover plate;

[0035] Figure 6 Structural schematic diagram of another cover plate according to an embodiment of the present utility model;

[0036] Figure 7 For Figure 6Schematic cross-sectional view of the shown cover plate;

[0037] Figure 8 For Figure 6 Schematic bottom view of the shown cover plate;

[0038] Figure 9 Schematic structural view of another cover plate according to an embodiment of the present invention.

[0039] Explanation of reference numerals:

[0040] 1. Housing; 101. First cover plate; 1011. Through hole; 1012. Terminal post; 1013. Sealing plate; 102. Second cover plate; 1021. Liquid injection hole; 1022. Explosion-proof valve; 2. Electrode group; 201. Tab; 2011. Body; 2012. Bent portion; 3. Connecting piece; 301. Terminal post connecting portion; 302. Tab connecting portion; 4. Plastic plate; 401. Flange; 5. Gap. Detailed implementation manners

[0041] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] Aiming at the problems in the related art that the connection manner between the connecting piece and the tab is complex and occupies a relatively large internal space of the battery cell, the present invention provides a battery cell and a battery pack.

[0043] The following combines Figures 1 to 9 , to describe the embodiments of the present invention.

[0044] According to an embodiment of the present invention, on the one hand, as Figures 1 to 9 shown, a battery cell is provided, including: a housing 1, an electrode group 2, a pair of connecting pieces 3, and a plastic plate 4.

[0045] Specifically, both ends of the housing 1 are provided with openings. A first cover plate 101 is provided on one of the openings. A through hole 1011 is provided on the first cover plate 101. A second cover plate 102 is provided on the other opening. Pole columns 1012 are provided on both the first cover plate 101 and the second cover plate 102. The pole group 2 is arranged inside the housing 1 and pole tabs 201 are provided at both ends. The pole tabs 201 are arranged in a staggered manner with the corresponding pole columns 1012. The pole tab 201 near the first cover plate 101 includes a body 2011 connected to the pole group 2 and a bent portion 2012 bent from the end of the body 2011 towards one side. The bent portion 2012 is arranged corresponding to the through hole 1011. A pair of connecting pieces 3 are arranged inside the housing 1 and are respectively arranged at both ends of the pole group 2. The connecting pieces 3 are used to connect the pole columns 1012 and the corresponding pole tabs 201. The connecting piece 3 near the first cover plate 101 is fixed in the space defined by the body 2011 and the bent portion 2012 and is in contact with the lower surface of the bent portion 2012. A plastic plate 4 is arranged inside the housing 1 and is located between the second cover plate 102 and the pole group 2. The plastic plate 4 is provided with pole column mounting holes. The pole column 1012 on the second cover plate 102 is connected to the corresponding connecting piece 3 by passing through the pole column mounting holes. The opposite ends of the plastic plate 4 along its length direction extend away from the second cover plate 102 to form flanges 401.

[0046] In this embodiment, by providing an opening on the housing 1 that is communicated with its interior, it is convenient for operators to assemble relevant structures such as the pole group 2 into the housing 1, improving the convenience of assembly. Further, the first cover plate 101 and the second cover plate 102 are used to seal the opening, ensuring the sealing performance of the battery cell, reducing the possibility of external moisture, dust and other impurities entering the interior of the battery cell, ensuring the cleanliness and stability of the interior environment of the battery cell, and thus being beneficial to extending the service life of the battery cell. Secondly, the pole columns 1012 and the pole tabs 201 in this embodiment are arranged in a staggered manner, making use of the space in other directions inside the housing 1. Compared with the existing situation where both the connecting piece 3 and the pole tab 201 are arranged along the axial direction of the pole column 1012, the internal space of the housing 1 occupied by the connecting piece 3 and the pole tab 201 in the height direction (axial direction of the pole column) of the housing 1 in the connected state is reduced, improving the utilization rate of the internal space of the housing 1, and thus enabling the battery cell to store more energy under the same volume. Moreover, the pole tab 201 is connected to the connecting piece 3 through the bent portion 2012, which can reduce the operation difficulty of connecting the pole tab 201 and the connecting piece 3 and also reduce the occupation of the internal space of the housing 1 by the two in the connected state. In addition, since the materials of the first cover plate 101 and the second cover plate 102 can be metal, in order to prevent a short circuit problem between the pole group 2 and the second cover plate 102, a plastic plate 4 is arranged between the second cover plate 102 and the pole group 2, and the plastic plate 4 can effectively isolate the pole group 2 and the second cover plate 102 by using the electrical insulation performance of the plastic plate 4. Further, by providing flanges 401 on the plastic plate 4, the anti-deformation ability of the plastic plate 4 can be improved, ensuring that the plastic plate 4 is closely attached to the inner surface of the housing 1.

[0047] It should be noted that the length direction of the plastic plate 4 and the height direction of the housing 1 are Figure 1 and Figure 2 The direction shown in is consistent.

[0048] According to one embodiment of the utility model, Figure 5 As shown, the connecting piece 3 includes a pole connecting portion 301 connected to the pole 1012 and a pole lug connecting portion 302 connected to the pole lug 201. Since the pole lug 201 and the pole 1012 in this embodiment are staggered, the connecting piece 3 is divided into the pole connecting portion 301 and the pole lug connecting portion 302, so that the connecting piece 3 can be adapted to the position of the pole lug 201 and the pole 1012, so that the pole lug 201 and the pole 1012 can be connected, and the current can flow smoothly between the pole lug 201 and the pole 1012.

[0049] According to one embodiment of the utility model, Figure 1 and Figure 5 As shown, a gap 5 is left between the tab connection part 302 and the inner wall of the shell 1 extending along the length direction thereof, and the bent portion 2012 passes through the gap 5 and the through hole 1011 provided on the upper surface of the tab connection part 302 through the body 2011. Since the lower surface of the bent portion 2012 needs to fit with the upper surface of the tab connection part 302, if the bent portion 2012 is to come to the upper surface of the tab connection part 302, it is usually necessary to provide a passage opening suitable for the body 2011 to pass through on the tab connection part 302, however, this will make the structure of the tab connection part 302 relatively complicated, increasing the initial production cost. Therefore, in order to solve the above problem, in this embodiment, the body 2011 is allowed to pass through the gap 5 between the tab connection part 302 and the inner wall of the shell 1 extending along the length direction and the through hole 1011 on the first cover plate 101, so that there is no need to make complex adjustments to the structure of the connecting piece 3, thereby simplifying the structure of the connecting piece 3.

[0050] It should be noted that the length direction of the housing 1 is Figure 1 and Figure 2 The direction shown in is consistent.

[0051] According to one embodiment of the utility model, Figure 2 and Figure 9As shown, the through hole 1011 is a strip-shaped hole, and the length direction of the strip-shaped hole is consistent with the length direction of the first cover plate 101. In this embodiment, the through hole 1011 is set as a strip-shaped hole, and the length direction of the through hole 1011 is made consistent with the length direction of the first cover plate 101. On the one hand, it can provide a larger operating space for the operator, making the connection operation between the tab 201 and the connecting piece 3 easier and more convenient; on the other hand, it enables the operator to judge the assembly direction of the first cover plate 101 on the housing 1 in a short time, improving the assembly efficiency and reducing the time consumed by the assembly.

[0052] It should be noted that the length direction of the strip-shaped hole, the length direction of the first cover plate 101 and Figure 1 and Figure 2 are consistent with the directions shown in

[0053] According to an embodiment of the present invention, the length of the tab connecting portion 302 is greater than the length of the through hole 1011. It can be understood that due to the limitation of the width dimension of the first cover plate 101 itself, the width of the through hole 1011 is relatively small. Therefore, in this embodiment, making the length of the tab connecting portion 302 greater than the length of the through hole 1011 can increase the connection area between the tab 201 and the tab connecting portion 302, ensuring the overcurrent capacity of the current.

[0054] It should be noted that the width direction of the first cover plate 101, the width direction of the through hole 1011 and Figure 1 and Figure 2 are consistent with the directions shown in

[0055] According to an embodiment of the present invention, as Figure 3 shown, the height of the body 2011 is consistent with the thickness of the tab connecting portion 302. In this embodiment, making the height of the body 2011 in the tab 201 match the thickness of the tab connecting portion 302, on the one hand, can make the lower surface of the bent portion 2012 closely fit on the connecting piece 3. In this way, not only can the connection stability between the two be enhanced, but also the contact resistance can be reduced, improving the transmission efficiency of the current between the tab 201 and the terminal 1012; on the other hand, it can make the structure of the connecting piece 3 and the tab 201 more compact in the connected state, reducing the unnecessary occupation of the internal space of the housing 1.

[0056] According to an embodiment of the present invention, as Figure 3 shown, the body 2011 is perpendicular to the bent portion 2012. In this embodiment, setting the body 2011 of the tab 201 perpendicular to the bent portion 2012 of the tab 201 can make the structure of the tab 201 in the housing 1 more compact, optimize the internal space of the housing 1, and improve the energy density of the battery cell.

[0057] According to an embodiment of the present invention, as Figure 6 andFigure 7 As shown in the figure, a liquid injection hole 1021 and an explosion-proof valve 1022 are provided on the second cover plate 102. In this embodiment, the liquid injection hole 1021 and the explosion-proof valve 1022 are arranged on the second cover plate 102. On the one hand, the self-structure of the second cover plate 102 can be made more compact, optimizing the structural layout on the second cover plate 102. On the other hand, it is convenient to add electrolyte into the battery cell, and at the same time, it can avoid excessive pressure inside the battery cell, improving the use safety of the battery cell.

[0058] According to an embodiment of the present utility model, as Figure 4 shown in the figure, a sealing plate 1013 is provided on the first cover plate 101, and the sealing plate 1013 is welded to the through hole 1011 to seal the through hole 1011. In this embodiment, the sealing plate 1013 is welded to the through hole 1011 by welding. On the one hand, the connection strength between the two can be improved, reducing the possibility of the sealing plate 1013 falling off during the use of the battery cell. On the other hand, it can avoid the appearance of gaps between the sealing plate 1013 and the hole wall of the through hole 1011, improving the self-sealing performance of the housing 1 and reducing the possibility of external impurities entering the battery cell.

[0059] 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.

[0060] It can be understood that by adopting the above-mentioned battery cells, the battery pack of this embodiment can improve its space utilization rate, so that without changing its own volume, its energy density can be improved, its use 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.

[0061] It should be noted that the battery cell in this embodiment can be a blade battery. Specifically, the battery pack in this embodiment can be formed by connecting a plurality of blade batteries in series, or by connecting a plurality of blade batteries in parallel, or by a combination of series and parallel connections of a plurality of blade batteries. Specifically, it can be adjusted according to the actual application scenario and requirements. The present utility model does not make specific limitations in this regard.

[0062] In addition, to realize 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. For the sake of clearly and briefly describing the technical solution provided by 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.

[0063] Although 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 fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that: include: The shell has openings at both ends, one of the openings is provided with a first cover plate, the first cover plate is provided with a through hole, the other opening is provided with a second cover plate, and both the first cover plate and the second cover plate are provided with poles; A pole group, arranged in the shell and provided with pole ears at both ends, the pole ears are staggered with the corresponding pole column, the pole ear close to the first cover plate comprises a body connected to the pole group and a bending portion bent toward one side from the end of the body, the bending portion is arranged corresponding to the through hole; A pair of connecting pieces, arranged in the housing and respectively arranged at both ends of the pole group, the connecting pieces are used to connect the poles and the corresponding pole ears, and the connecting pieces close to the first cover plate are fixed in the space defined by the body and the bent portion and are in contact with the lower surface of the bent portion; A plastic plate is arranged in the shell and located between the second cover plate and the pole group, and the plastic plate is provided with a pole mounting hole; the pole on the second cover plate is connected to the corresponding connecting piece by passing through the pole mounting hole; the opposite ends of the plastic plate along the length direction thereof extend in a direction away from the second cover plate to form a flange.

2. The battery cell according to claim 1, characterized in that: The connecting piece includes a pole connecting portion connected to the pole and a tab connecting portion connected to the tab.

3. The battery cell according to claim 2, characterized in that: A gap is left between the tab connection portion and the inner wall of the shell extending along the length direction thereof, and the bending portion passes through the body, through the gap and the through hole, and is arranged on the upper surface of the tab connection portion.

4. The battery cell according to claim 2, characterized in that: The through hole is a strip-shaped hole, and the length direction of the strip-shaped hole is consistent with the length direction of the first cover plate.

5. The battery cell according to claim 4, characterized in that: The length of the tab connecting portion is greater than the length of the through hole.

6. The battery cell according to claim 2, characterized in that: The height of the body is consistent with the thickness of the tab connecting portion.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The main body and the bending portion are arranged perpendicularly.

8. The battery cell according to any one of claims 1 to 6, characterized in that: The second cover plate is provided with a liquid injection hole and an explosion-proof valve.

9. The battery cell according to any one of claims 1 to 6, characterized in that: A sealing plate is disposed on the first cover plate, and the sealing plate is welded to the through hole and seals the through hole.

10. A battery pack, characterized in that: include: A plurality of battery cells according to any one of claims 1 to 9.

Images