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, and the battery cell mainly comprises a shell, a pair of pole columns, a pair of connecting sheets and a sealing plate, a pair of mounting holes and a through hole are formed in one side of the shell at intervals, the through hole is located between the pair of mounting holes, a plurality of pole groups and a plurality of pairs of pole lugs in one-to-one correspondence with the pole groups are arranged in the shell, and the hole wall of the through hole is inclined relative to the upper surface of the shell, so that the opening area of the upper end of the through hole is larger than that of the lower end of the through hole; the pair of poles are respectively arranged on the pair of mounting holes; the pair of connecting sheets are arranged on the pole groups and on the inner side of the shell, one end of each connecting sheet is connected with the pole column, and the other opposite end of each connecting sheet extends to the through hole and is connected with the tab; the sealing plate is arranged in the through hole, and the peripheral wall of the sealing plate and the hole wall of the through hole correspondingly form an inclined face and are connected with the hole wall of the through hole. The connecting sheets and the tabs are arranged in the through holes, the space utilization rate is improved, the through holes are connected with the sealing plate through the inclined planes, and the reliability is high.

Description

Technical Field

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

[0002] With the development of new energy technologies, battery packs are increasingly used in various new energy products. In a battery pack, a pole column is connected to an ear of a battery cell through a connecting piece to achieve electrical conduction.

[0003] However, both the connecting piece and the ear need to be bent, and the connecting piece, the pole column, and the ear are usually located on the same vertical plane, so a large space needs to be occupied, resulting in a low space utilization rate 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 problem that the existing connecting piece connecting the pole column and the ear needs to occupy a large space, resulting in a low space utilization rate of the battery cell.

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

[0006] A housing, on one side of which there are provided a pair of mounting holes and a through hole at intervals along the length direction, the through hole being located between the pair of mounting holes, and there are provided a plurality of pole groups and a plurality of pairs of ears corresponding to the pole groups one by one in the housing, the hole wall of the through hole is inclined relative to the upper surface of the housing, so that the upper opening area of the through hole is larger than the lower opening area of the through hole;

[0007] A pair of pole columns, respectively arranged on the pair of mounting holes;

[0008] A pair of connecting pieces, arranged on the plurality of pole groups and on the inner side of the housing, one end of the connecting piece is connected to the pole column, and the opposite end extends to the through hole and is connected to the ear;

[0009] A sealing plate, arranged in the through hole, the peripheral wall of the sealing plate forms an inclined surface corresponding to the hole wall of the through hole and is connected to the hole wall of the through hole.

[0010] Advantageous Effects: The utility model opens a through hole on the housing, one end of the connecting piece is connected to the ear at the through hole, reducing the number of bends of the connecting piece and the ear, thereby reducing the thickness dimension. The other end of the connecting piece is connected to the pole column, and the pole column and the ear are arranged in a staggered manner, further reducing the thickness dimension, improving the space utilization rate and production efficiency of the battery cell. In addition, the through hole and the sealing plate are connected through an inclined surface, which can effectively limit and support the sealing plate by the inclined surface, facilitate installation, have a firm connection, and strong reliability.

[0011] In an alternative embodiment, the through hole is a rectangular through hole, the length direction of the rectangular through hole is the same as the length direction of the housing, and the peripheral wall of the sealing plate is welded to the peripheral hole walls of the rectangular through hole.

[0012] Advantageous effects: The through hole being a rectangular through hole can adapt to the tab and the connecting piece. The length direction of the rectangular through hole being the same as the length direction of the housing can reduce the space occupied by the rectangular through hole in the width direction of the housing, thereby improving the structural strength of the housing. The peripheral wall of the sealing plate is welded to the peripheral hole walls of the rectangular through hole to seal the rectangular through hole.

[0013] In an alternative embodiment, the inclination angle of the hole wall of the rectangular through hole relative to the upper surface of the housing is 2° to 88°.

[0014] Advantageous effects: By restricting the inclination angle of the hole wall of the rectangular through hole relative to the upper surface of the housing, the welding reliability between the sealing plate and the housing can be ensured, and the structural strength of the battery cell can be improved.

[0015] In an alternative embodiment, the inclination angles of the peripheral hole walls of the rectangular through hole relative to the upper surface of the housing are the same.

[0016] Advantageous effects: The inclination angles of the peripheral hole walls of the rectangular through hole relative to the upper surface of the housing are the same, which is convenient for welding to form a sealing surface.

[0017] In an alternative embodiment, a first chamfer is provided on the upper peripheral wall of the through hole, and a second chamfer is provided on the lower peripheral wall of the sealing plate.

[0018] Advantageous effects: By providing the first chamfer and the second chamfer, the assembly of the sealing plate and the housing is facilitated, and the wear between the sealing plate and the housing is reduced.

[0019] In an alternative embodiment, the relationship between the thickness t of the sealing plate and the thickness T of the housing is 0.25T ≤ t ≤ 0.8T.

[0020] Advantageous effects: The thickness of the sealing plate is smaller than the thickness of the housing, enabling the sealing plate to be completely embedded in the through hole of the housing, preventing the sealing plate from protruding beyond the housing and occupying the height space of the battery cell, thereby improving the space utilization rate of the battery cell.

[0021] In an alternative embodiment, the upper surface of the sealing plate is 0.15 mm to 0.5 mm lower than the upper surface of the housing.

[0022] Advantageous effects: Due to the dimensional limitations of the sealing plate and the housing, and the upper surface of the sealing plate being lower than the upper surface of the housing, it is possible to prevent the solder joints from protruding beyond the upper surface of the housing, thereby avoiding the solder joints affecting the normal installation of other components on the upper surface of the housing.

[0023] In an alternative embodiment, an insulating plate is further included. The insulating plate is disposed in the through hole, and the top surface of the insulating plate is connected to the bottom surface of the sealing plate.

[0024] Beneficial effects: The insulating plate can insulate the sealing plate. By disposing the insulating plate in the through hole and connecting the top surface of the insulating plate to the bottom surface of the sealing plate, the occupied space of the insulating plate can be reduced, and the space utilization rate of the battery cell can be further improved.

[0025] In an alternative embodiment, an insulating rubber ring and a sealing ring are further provided between the pole post and the housing. The insulating rubber ring is disposed at the upper end of the sealing ring. An insulating rubber plate is further provided between the housing and the connecting piece. The insulating rubber plate is provided with a through hole, and the through hole is sleeved outside the sealing ring.

[0026] Beneficial effects: The insulating rubber ring is located at the upper end of the sealing ring, playing the roles of insulation and sealing. The sealing ring is disposed between the insulating rubber ring and the limiting portion, which can further improve the sealing effect. The insulating rubber plate is limited in cooperation with the pole post through the through hole.

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

[0028] Beneficial effects: Since the battery pack includes battery cells, it has the same effects as the battery cells, that is, a through hole is opened in the housing, one end of the connecting piece is connected to the tab at the through hole, reducing the bending times of the connecting piece and the tab, thereby reducing the thickness dimension. The other end of the connecting piece is connected to the pole post, and the pole post and the tab are arranged in a staggered manner, further reducing the thickness dimension, improving the space utilization rate and production efficiency of the battery cell. In addition, the through hole and the sealing plate are connected by an inclined surface, which can effectively limit and support the sealing plate by using the inclined surface, facilitating installation, with firm connection and strong reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present invention 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 invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 It is a schematic structural diagram of a battery cell according to an embodiment of the present invention;

[0031] Figure 2 For Figure 1 the top view;

[0032] Figure 3 For Figure 2 the cross-sectional view at A in

[0033] Figure 4 is Figure 3 the enlarged view of part B in

[0034] Figure 5 is Figure 3 the partial structural schematic diagram in

[0035] Figure 6 the top view of an electric core without a sealing plate according to an embodiment of the present invention;

[0036] Figure 7 the structural schematic diagram of the tab and the connecting piece of an electric core according to an embodiment of the present invention.

[0037] Description of reference numerals:

[0038] 1. Housing; 101. Through hole; 1011. Hole wall; 1012. First chamfer; 2. Electrode group; 3. Tab; 4. Electrode post; 5. Connecting piece; 6. Sealing plate; 601. Second chamfer; 7. Insulating plate; 8. Insulating rubber ring; 9. Sealing ring; 10. Insulating rubber plate; 11. Liquid injection hole. Specific embodiments

[0039] 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. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] Next, with reference to Figures 1 to 7 , the embodiments of the present invention will be described.

[0041] According to the embodiments of the present invention, on the one hand, as shown in Figures 1 to 3As shown in the figure, a battery cell is provided, mainly including: a housing 1, a pair of pole columns 4, a pair of connecting pieces 5, and a sealing plate 6. On one side of the housing 1, a pair of mounting holes and a through hole 101 are provided at intervals along the length direction, and the through hole 101 is located between the pair of mounting holes. A plurality of pole groups 2 and a plurality of pairs of pole tabs 3 corresponding to the pole groups 2 one by one are provided in the housing 1. The hole wall 1011 of the through hole 101 is inclined relative to the upper surface of the housing 1, so that the upper end opening area of the through hole 101 is larger than the lower end opening area of the through hole 101. A pair of pole columns 4 are respectively arranged on the pair of mounting holes. A pair of connecting pieces 5 are arranged on the plurality of pole groups 2 and on the inner side of the housing 1. One end of the connecting piece 5 is connected to the pole column 4, and the opposite end extends to the through hole 101 and is connected to the pole tab 3. The sealing plate 6 is arranged in the through hole 101, and the peripheral wall of the sealing plate 6 forms an inclined surface corresponding to the hole wall 1011 of the through hole 101 and is connected to the hole wall 1011 of the through hole 101.

[0042] For the battery cell provided by the embodiment of the present utility model, a through hole 101 is opened on the housing 1, and one end of the connecting piece 5 is connected to the pole tab 3 at the through hole 101, reducing the number of bends of the connecting piece 5 and the pole tab 3, thereby reducing the thickness dimension. The other end of the connecting piece 5 is connected to the pole column 4, and the pole column 4 and the pole tab 3 are arranged in a staggered manner, further reducing the thickness dimension and improving the space utilization rate and production efficiency of the battery cell. In addition, the through hole 101 and the sealing plate 6 are connected through an inclined surface, which can effectively limit and support the sealing plate 6 by the inclined surface, facilitating installation, with firm connection and strong reliability. Moreover, since the upper end opening area of the through hole 101 is larger than the lower end opening area of the through hole 101, the sealing plate 6 is more easily installed in the through hole 101 from above the housing 1 and supported by the through hole 101, which also facilitates the installation of the sealing plate 6.

[0043] Specifically, as Figure 1 shown, side plates are provided around the housing 1, a bottom plate is provided at the bottom, and a top plate is provided at the top. The four side plates, the top plate, and the bottom plate are integrally formed and enclose a cavity, having good structural strength. As Figure 6 shown, through holes 101 and a pair of mounting holes are provided at intervals on the top plate. As Figure 7 shown, a plurality of pole groups 2 are stacked and arranged in the cavity. A plurality of pairs of pole tabs 3 are provided on the side of the plurality of pole groups 2 close to the pole column 4. Each pole group 2 is provided with a positive pole tab and a negative pole tab. Since the pole column 4 is arranged on the housing 1 and the pole tab 3 is installed at the through hole 101, the pole tab 3 and the pole column 4 are arranged in a staggered manner, so that the installation thickness can be reduced and the space utilization rate can be improved.

[0044] A pair of pole columns 4 include a positive pole column and a negative pole column. As Figure 3As shown, the connecting pieces 5 correspond to the pole columns 4 one by one. One of the connecting pieces 5 connects the positive pole column and the positive pole tabs of multiple pole groups 2, and the other connecting piece 5 connects the negative pole column and the negative pole tabs of multiple pole groups 2. The connecting piece 5 needs to be conductive to achieve electrical conduction between the pole tabs 3 and the pole columns 4. There is a gap between the two connecting pieces 5 to prevent short circuit between the positive pole column and the negative pole column. The pole tabs 3 are bent 90 degrees along the width direction of the housing 1 and then attached to the top surface of the connecting piece 5 to reduce the size of the through hole 101 and improve the structural strength of the housing 1. The connecting piece 5 extends along the length direction of the top plate without bending, further reducing the installation thickness. The length direction of the top plate is the same as the length direction of the housing 1.

[0045] It should be noted that the number of pole groups 2 in the battery cell is not limited in the embodiments of the present invention, and two, three or more than three can be selected. Exemplarily, as Figure 7 shown, two pole groups 2 are provided, and each of the two pole groups 2 is provided with a positive pole tab and a negative pole tab. The two positive pole tabs are arranged side by side and are welded to a connecting piece 5 after being bent. The two negative pole tabs are arranged side by side and are welded to the other connecting piece 5 after being bent. Both the positive pole tab and the negative pole tab extend along the width direction of the top plate. The width direction of the top plate is the same as the width direction of the housing 1.

[0046] The up and down directions in the embodiments of the present invention are as Figure 1 shown. The length direction of the housing 1 is as Figure 2 shown by the arrow L in, and the width direction of the housing 1 is as Figure 2 shown by the arrow W in.

[0047] In one embodiment, as Figure 6 shown, the through hole 101 is a rectangular through hole, the length direction of the rectangular through hole is the same as the length direction of the housing 1, and the peripheral wall of the sealing plate 6 is welded to the peripheral hole walls of the rectangular through hole. Laser welding can be used for welding. The through hole 101 being a rectangular through hole can adapt to the pole tabs 3 and the connecting piece 5. The length direction of the rectangular through hole being the same as the length direction of the housing 1 can reduce the space occupied by the rectangular through hole in the width direction of the housing 1 to improve the structural strength of the housing 1. The peripheral wall of the sealing plate 6 is welded to the peripheral hole walls of the rectangular through hole to seal the rectangular through hole.

[0048] In some other embodiments, the through hole 101 can also be selected to be other conventional shapes such as round holes and oval holes according to needs.

[0049] Furthermore, in one embodiment, as Figure 4As shown, the inclination angle of the hole wall of the rectangular through-hole relative to the upper surface of the housing 1 is 2° to 88°. By restricting the inclination angle of the hole wall of the rectangular through-hole relative to the upper surface of the housing 1, the welding reliability between the sealing plate 6 and the housing 1 can be ensured, and the structural strength of the battery cell can be improved. For example, the inclination angle of the hole wall of the rectangular through-hole relative to the upper surface of the housing 1 is 10°.

[0050] Furthermore, in one embodiment, the inclination angles of the peripheral hole walls of the rectangular through-hole relative to the upper surface of the housing 1 are the same. This facilitates welding to form a sealing surface. For example, the inclination angles of the peripheral hole walls of the rectangular through-hole relative to the upper surface of the housing 1 are all 30°.

[0051] In one embodiment, as Figure 4 and Figure 5 shown, a first chamfer 1012 is provided on the upper peripheral wall of the through-hole 101, and a second chamfer 601 is provided on the lower peripheral wall of the sealing plate 6. By providing the first chamfer 1012 and the second chamfer 601, the assembly of the sealing plate 6 and the housing 1 is facilitated, and the wear between the sealing plate 6 and the housing 1 is reduced. Since the first chamfer 1012 is provided on the outside and the second chamfer 601 is provided on the inside, the first chamfer 1012 can adopt a rounded chamfer to achieve continuous transition. The second chamfer 601 can adopt a flat chamfer to reduce the processing difficulty and lower the usage cost.

[0052] Of course, in some other embodiments, the structures of the first chamfer 1012 and the second chamfer 601 can also select other existing structures according to needs, and the embodiments of the present utility model do not impose too many restrictions on this.

[0053] In one embodiment, as Figure 4 shown, the relationship between the thickness t of the sealing plate 6 and the thickness T of the housing 1 is 0.25T ≤ t ≤ 0.8T. For example, t = 0.5T. The thickness of the sealing plate 6 is smaller than that of the housing 1, so that the sealing plate 6 can be completely embedded in the through-hole 101 of the housing 1, preventing the sealing plate 6 from exceeding the housing 1 and occupying the height space of the battery cell, thereby improving the space utilization rate of the battery cell.

[0054] Further, in one embodiment, as Figure 4 shown, the upper surface of the sealing plate 6 is 0.15 mm to 0.5 mm lower than the upper surface of the housing 1. For example, the upper surface of the sealing plate 6 is 0.2 mm lower than the upper surface of the housing 1. Due to the dimensional limitations of the sealing plate 6 and the housing 1, and the upper surface of the sealing plate 6 being lower than the upper surface of the housing 1, it is possible to prevent the solder joints from protruding from the upper surface of the housing 1, thereby avoiding the solder joints affecting the normal installation of other components on the upper surface of the housing 1.

[0055] In one embodiment, as Figure 4 and Figure 5As shown, the battery cell further includes an insulating plate 7, which is disposed in the through hole 101, and the top surface of the insulating plate 7 is connected to the bottom surface of the sealing plate 6. The insulating plate 7 can insulate the sealing plate 6. Disposing the insulating plate 7 in the through hole 101 and connecting the top surface of the insulating plate 7 to the bottom surface of the sealing plate 6 can reduce the occupied space of the insulating plate 7 and further improve the space utilization rate of the battery cell.

[0056] It should be noted that the embodiment of the present invention does not limit the connection manner between the insulating plate 7 and the sealing plate 6. The connection manner between the top surface of the insulating plate 7 and the bottom surface of the sealing plate 6 can be a fixed connection structure. For example, the top surface of the insulating plate 7 is adhered to the bottom surface of the sealing plate 6 through a fixing glue, and the connection is firm. It can also be a detachable connection structure. For example, the top surface of the insulating plate 7 is fixed to the bottom surface of the sealing plate 6 through the cooperation of a buckle and a slot, which is convenient for quick installation.

[0057] Furthermore, in one embodiment, as Figure 3 shown, an insulating rubber ring 8 and a sealing ring 9 are further provided between the pole column 4 and the housing 1. The insulating rubber ring 8 is disposed at the upper end of the sealing ring 9, and an insulating rubber plate 10 is further provided between the housing 1 and the connecting piece 5. The insulating rubber plate 10 is provided with a through hole, and the through hole is sleeved outside the sealing ring 9. The insulating rubber ring 8 is located at the upper end of the sealing ring 9 and plays the roles of insulation and sealing. The sealing ring 9 is disposed between the insulating rubber ring 8 and the limiting portion, which can further improve the sealing effect. The insulating rubber plate 10 is limited in cooperation with the pole column 4 through the through hole. The insulating rubber ring 8, the sealing ring 9, the insulating rubber plate 10, a pair of pole columns 4 and a pair of connecting pieces 5 are all disposed on the housing 1, which is beneficial to centralized design to further improve the space utilization rate of the battery cell.

[0058] It should be noted that the embodiment of the present invention does not limit the material of the sealing ring 9. For example, the sealing ring 9 can adopt conventional sealing rings such as rubber sealing rings and silicone sealing rings. In addition, the materials of the insulating rubber ring 8 and the insulating rubber plate 10 are not limited either. For example, both the insulating rubber ring 8 and the insulating rubber plate 10 can adopt plastic parts.

[0059] In one embodiment, as Figure 1 and Figure 2 shown, a liquid injection hole 11 is further provided at the central position of the sealing plate 6. The liquid injection hole 11 is used for injecting electrolyte.

[0060] In one embodiment, an explosion-proof valve is further provided at the bottom of the housing 1. The explosion-proof valve opens when the internal pressure of the battery cell is greater than a preset pressure, so that the chamber inside the battery cell is communicated with the outside through the explosion-proof valve and the high-pressure gas is discharged, so as to avoid explosion due to too high internal pressure of the battery cell.

[0061] According to the embodiment of the present invention, on the other hand, a battery pack is further provided, which mainly includes: a plurality of battery cells.

[0062] Since the battery pack includes battery cells and has the same effect as the battery cells, that is, through holes 101 are provided in the housing 1, one end of the connecting piece 5 is connected to the tab 3 at the through holes 101, reducing the number of bends of the connecting piece 5 and the tab 3, thereby reducing the thickness dimension. The other end of the connecting piece 5 is connected to the terminal post 4, and the terminal post 4 and the tab 3 are arranged in a staggered manner, further reducing the thickness dimension and improving the space utilization rate and production efficiency of the battery cell. In addition, the through holes 101 and the sealing plate 6 are connected by an inclined surface, which can effectively limit and support the sealing plate 6 by the inclined surface, facilitating installation, with firm connection and strong reliability. Moreover, since the upper opening area of the through hole 101 is larger than the lower opening area of the through hole 101, the sealing plate 6 is more easily installed in the through hole 101 from above the housing 1 and supported by the through hole 101, which also facilitates the installation of the sealing plate 6.

[0063] Specifically, multiple battery cells can be connected in series, in parallel, or in a combination of series and parallel. In this regard, the embodiments of the present invention do not impose any limitations.

[0064] Although the embodiments of the present invention 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 invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that: include: A shell, one side of which is provided with a pair of mounting holes and a through hole at intervals along the length direction, the through hole being located between the pair of mounting holes, a plurality of pole groups and a plurality of pole ears corresponding to the pole groups are provided in the shell, and the hole wall of the through hole is inclined relative to the upper surface of the shell so that the upper end opening area of ​​the through hole is larger than the lower end opening area of ​​the through hole; A pair of poles, respectively arranged on the pair of mounting holes; A pair of connecting pieces, arranged on the plurality of pole groups and arranged on the inner side of the housing, one end of the connecting piece is connected to the pole column, and the other end extends to the through hole and is connected to the pole ear; The sealing plate is arranged in the through hole, and the peripheral wall of the sealing plate forms an inclined surface corresponding to the hole wall of the through hole and is connected to the hole wall of the through hole.

2. The battery cell according to claim 1, characterized in that: The through hole is a rectangular through hole, the length direction of the rectangular through hole is consistent with the length direction of the shell, and the peripheral wall of the sealing plate is welded to the peripheral hole walls of the rectangular through hole.

3. The battery cell according to claim 2, characterized in that: The inclination angle of the hole wall of the rectangular through hole relative to the upper surface of the shell is 2° to 88°.

4. The battery cell according to claim 3, characterized in that: The inclination angles of the four peripheral hole walls of the rectangular through hole relative to the upper surface of the shell are consistent.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The upper peripheral wall of the through hole is provided with a first chamfer, and the lower peripheral wall of the sealing plate is provided with a second chamfer.

6. The battery cell according to any one of claims 1 to 4, characterized in that: The relationship between the thickness t of the sealing plate and the thickness T of the shell is 0.25T≤t≤0.8T.

7. The battery cell according to claim 6, characterized in that: The upper surface of the sealing plate is 0.15 mm to 0.5 mm lower than the upper surface of the shell.

8. The battery cell according to any one of claims 1 to 4, characterized in that: An insulating plate is also included. The insulating plate is arranged in the through hole, and the top surface of the insulating plate is connected to the bottom surface of the sealing plate.

9. The battery cell according to claim 8, characterized in that: An insulating rubber ring and a sealing ring are also provided between the pole and the shell. The insulating rubber ring is arranged at the upper end of the sealing ring. An insulating rubber plate is also provided between the shell and the connecting piece. The insulating rubber plate is provided with a through hole. The through hole is sleeved outside the sealing ring.

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

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