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 pair of sealing plates. A pair of first through holes and a pair of mounting holes are formed in one side of the shell at intervals in the length direction, the pair of first through holes are 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 step surfaces are arranged at the lower ends of the first through holes along the peripheral sides; the pair of poles are respectively arranged on the pair of mounting holes; the pair of connecting sheets are arranged on the plurality of pole groups and on the inner side of the shell, one end of each connecting sheet is connected with the corresponding pole column, and the other end of each connecting sheet extends to the corresponding first through hole and is connected with the corresponding tab; the sealing plates are arranged in the first through holes respectively, the lower ends of the sealing plates are connected with the step face, and the peripheral walls of the sealing plates are connected with the hole walls of the first through holes. The connecting sheets and the tabs are installed in the first through holes, the space utilization rate is improved, the first through holes are provided with the sealing plates through the step faces, and the reliability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an electric core 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 electrode tab of an electric core through a connecting piece to achieve electrical conduction.

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

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

[0006] A housing, on one side of which there are provided a pair of first through holes and a pair of mounting holes at intervals along the length direction, the pair of first through holes being located between the pair of mounting holes, a plurality of pole groups and a plurality of pairs of electrode tabs corresponding to the pole groups one by one are arranged in the housing, and a stepped surface is provided along the circumferential side at the lower end of the first 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 other end extends to the first through hole and is connected to the electrode tab;

[0009] A pair of sealing plates, respectively arranged in the first through holes, the lower end of the sealing plate is connected to the stepped surface, and the peripheral wall of the sealing plate is connected to the hole wall of the first through hole.

[0010] Beneficial effects: The utility model opens a first through hole on the housing, one end of the connecting piece is connected to the electrode tab at the first through hole, reducing the number of bends of the connecting piece and the electrode tab, thereby reducing the thickness dimension. The other end of the connecting piece is connected to the pole column, and the pole column and the electrode tab are arranged in a staggered manner, further reducing the thickness dimension and improving the space utilization rate of the electric core. In addition, a stepped surface is arranged at the lower end of the first through hole to mount the sealing plate, and the stepped surface can effectively limit and support the sealing plate. The peripheral side of the sealing plate is connected to the hole wall of the first through hole, with firm connection and strong reliability.

[0011] In an alternative embodiment, the first through hole includes a first sub-through hole and a second sub-through hole that are connected. The stepped surface is formed between the first sub-through hole and the second sub-through hole. The first sub-through hole is provided at the upper end of the second sub-through hole. The bottom surface of the sealing plate abuts against the stepped surface, and the peripheral wall of the sealing plate is welded to the hole wall of the first sub-through hole.

[0012] Advantageous effects: The first sub-through hole is used to install the sealing plate. The peripheral wall of the sealing plate is welded to the hole wall of the first sub-through hole to form a sealed welding surface, improving the welding reliability between the sealing plate and the housing. The second sub-through hole can leave an installation space for the connecting piece and the ear, which is beneficial to reducing the occupied space of the connecting piece and the ear.

[0013] In an alternative embodiment, the relationship between the thickness T1 of the first sub-through hole and the thickness T2 of the housing is 0.25T1 ≤ T2 ≤ 0.8T1.

[0014] Advantageous effects: The thickness of the first sub-through hole is smaller than the thickness of the housing, so as to weld the sealing plate at the first sub-through hole and leave a space for the second sub-through hole.

[0015] In an alternative embodiment, the thickness T3 of the sealing plate is 0.2 mm to 0.4 mm smaller than the thickness T1 of the first sub-through hole.

[0016] Advantageous effects: Through the dimensional limitation of the first sub-through hole and the housing, and the thickness of the sealing plate is smaller than the thickness of the first sub-through hole, the bottom surface of the sealing plate abuts against the stepped surface, and the upper surface of the sealing plate will not exceed the upper surface of the housing, preventing the solder joints from protruding beyond the upper surface of the housing.

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

[0018] Advantageous effects: Through the cooperation of the first chamfer and the second chamfer, it is convenient for the assembly of the sealing plate and the housing, and can also reduce the wear between the sealing plate and the housing.

[0019] In an alternative embodiment, an insulating plate is further included. The insulating plate is disposed in the second sub-through hole, and the top surface of the insulating plate is connected to the bottom surface of the sealing plate.

[0020] Advantageous effects: The insulating plate can provide an insulating effect on the sealing plate. Disposing the insulating plate in the second sub-through hole and connecting the top surface of the insulating plate to the bottom surface of the sealing plate can reduce the occupied space of the insulating plate.

[0021] 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 second through hole, and the second through hole is sleeved outside the sealing ring.

[0022] Advantageous effects: The insulating rubber ring is located at the upper end of the sealing ring, playing a role in 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 second through hole.

[0023] In an alternative embodiment, the housing is further provided with an explosion-proof valve located between a pair of the first through holes.

[0024] Advantageous effects: The explosion-proof valve opens when the internal air pressure of the battery cell is greater than a preset air pressure, so that the chamber inside the battery cell communicates with the outside through the explosion-proof valve, and the high-pressure gas is discharged to prevent the internal air pressure of the battery cell from being too high and exploding.

[0025] In an alternative embodiment, the first through hole is a regular hole, and the regular hole includes any one of a polygonal hole, a circular hole, an elliptical hole, and a racetrack-shaped hole.

[0026] Advantageous effects: The first through hole being a regular hole can reduce the processing difficulty of the first through hole and the installation difficulty of the sealing plate, which is beneficial to improving the production efficiency of the battery cell.

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

[0028] Advantageous effects: Since the battery pack includes the battery cells, it has the same effects as the battery cells, that is, a first through hole is opened on the housing, one end of the connecting piece is connected to the tab at the first through hole, reducing the number of bends 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 dislocation manner, further reducing the thickness dimension and improving the space utilization rate of the battery cell. In addition, a step surface is provided at the lower end of the first through hole to mount the sealing plate. The step surface can effectively limit and support the sealing plate, and the peripheral side of the sealing plate is connected to the hole wall of the first through hole, with firm connection and strong reliability. 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 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, other drawings can be obtained based on these drawings without creative efforts.

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

[0031] Figure 2 Cross-sectional view of a battery cell according to an embodiment of the present utility model;

[0032] Figure 3 is Figure 2 Enlarged view of part A in

[0033] Figure 4 Partial structural schematic diagram of the sealing plate and the housing of a battery cell according to an embodiment of the present utility model;

[0034] Figure 5 Partial structural schematic diagram of a battery cell according to an embodiment of the present utility model;

[0035] Figure 6 Partial structural schematic diagram of the tab of a battery cell before bending according to an embodiment of the present utility model;

[0036] Figure 7 Structural schematic diagram of the tab and the connecting piece of a battery cell before bending according to an embodiment of the present utility model;

[0037] Figure 8 Partial structural schematic diagram of the tab of a battery cell after bending according to an embodiment of the present utility model;

[0038] Figure 9 Structural schematic diagram of the tab and the connecting piece of a battery cell after bending according to an embodiment of the present utility model.

[0039] Explanation of reference numerals:

[0040] 1. Housing; 101. First through hole; 1011. First sub-through hole; 1012. Second sub-through hole; 1013. First chamfer; 102. Step surface; 2. Electrode group; 3. Tab; 4. Terminal; 5. Connecting piece; 6. Sealing plate; 601. Second chamfer; 7. Insulating plate; 8. Insulating rubber ring; 9. Sealing ring; 10. Insulating rubber plate; 11. Explosion-proof valve. Detailed implementation manners

[0041] 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0042] The following will be combined withFigures 1 to 9 , describe embodiments of the present utility model.

[0043] According to an embodiment of the present utility model, on the one hand, as Figure 1 and Figure 2 shown, a battery cell is provided, mainly including: a housing 1, a pair of pole columns 4, a pair of connecting plates 5 and a pair of sealing plates 6. A pair of first through holes 101 and a pair of mounting holes are provided at intervals along the length direction on one side of the housing 1, and the pair of first through holes 101 are 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, and a step surface 102 is provided along the circumferential side at the lower end of the first through hole 101. A pair of pole columns 4 are respectively provided on the pair of mounting holes. A pair of connecting plates 5 are provided on the plurality of pole groups 2 and on the inner side of the housing 1. One end of the connecting plate 5 is connected to the pole column 4, and the other end extends to the first through hole 101 and is connected to the pole tab 3. A pair of sealing plates 6 are respectively provided in the first through hole 101. The lower end of the sealing plate 6 is connected to the step surface 102, and the peripheral wall of the sealing plate 6 is connected to the hole wall of the first through hole 101.

[0044] For the battery cell provided by the embodiment of the present utility model, a first through hole 101 is opened on the housing 1, and one end of the connecting plate 5 is connected to the pole tab 3 at the first through hole 101, reducing the number of bends of the connecting plate 5 and the pole tab 3, thereby reducing the thickness dimension. The other end of the connecting plate 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 of the battery cell.

[0045] To ensure the sealing performance of the housing 1, after the first through hole 101 is opened on the housing 1, the first through hole 101 is sealed by the sealing plate 6. A step surface 102 is provided at the lower end of the first through hole 101 to mount the sealing plate 6. The step surface 102 can effectively limit and support the sealing plate 6, and the peripheral side of the sealing plate 6 is connected to the hole wall of the first through hole 101, with firm connection and strong reliability.

[0046] Specifically, the sealing plate 6 is used to seal the through hole. As Figure 1 and Figure 5 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. The top and bottom directions of the embodiment of the present utility model are as Figure 1 shown. The length direction of the housing 1 is as Figure 2 shown by the arrow L in

[0047] A pair of pole columns 4 includes a positive pole column and a negative pole column. 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 lugs of multiple pole groups 2, and the other connecting piece 5 connects the negative pole column and the negative pole lugs of multiple pole groups 2. The connecting piece 5 needs to be conductive to achieve electrical conduction between the pole lugs 3 and the pole columns 4. A gap is left between the two connecting pieces 5 to prevent short circuit between the positive pole column and the negative pole column. The pole lugs 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 first 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.

[0048] 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 Figures 6 to 9 shown, two pole groups 2 are provided, and each of the two pole groups 2 is provided with a positive pole lug and a negative pole lug. The two positive pole lugs are arranged side by side and are welded to a connecting piece 5 after being bent. The two negative pole lugs are arranged side by side and are welded to the other connecting piece 5 after being bent. Both the positive pole lug and the negative pole lug 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.

[0049] In one embodiment, as Figure 3 and Figure 4 shown, the first through hole 101 includes a first sub-through hole 1011 and a second sub-through hole 1012 that are communicated. A step surface 102 is formed between the first sub-through hole 1011 and the second sub-through hole 1012. The first sub-through hole 1011 is provided at the upper end of the second sub-through hole 1012. The bottom surface of the sealing plate 6 abuts against the step surface 102, and the peripheral wall of the sealing plate 6 is welded to the hole wall of the first sub-through hole 1011.

[0050] Specifically, the peripheral wall of the sealing plate 6 and the hole wall of the first sub-through hole 1011 can be sealed by laser welding. The first sub-through hole 1011 is used to install the sealing plate 6. The peripheral wall of the sealing plate 6 is welded to the hole wall of the first sub-through hole 1011 to form a sealed welding surface, improving the welding reliability between the sealing plate 6 and the housing 1. The second sub-through hole 1012 can leave an installation space for the connecting piece 5 and the pole lug 3, which is beneficial to reducing the occupied space of the connecting piece 5 and the pole lug 3.

[0051] In one embodiment, as Figure 3 shown, the relationship between the thickness T1 of the first sub-through hole 1011 and the thickness T2 of the housing 1 is 0.25T1 ≤ T2 ≤ 0.8T1. The thickness of the first sub-through hole 1011 is smaller than the thickness of the housing 1 so as to weld the sealing plate 6 at the first sub-through hole 1011 and leave a space for the second sub-through hole 1012.

[0052] Further, in one embodiment, as Figure 3 shown, the thickness T3 of the sealing plate 6 is 0.2 mm to 0.4 mm smaller than the thickness T1 of the first sub-through hole 1011. Through the dimensional limitations of the first sub-through hole 1011 and the housing 1, and the thickness of the sealing plate 6 being smaller than that of the first sub-through hole 1011, the bottom surface of the sealing plate 6 abuts against the stepped surface 102, and the upper surface of the sealing plate 6 does not exceed the upper surface of the housing 1, preventing the solder joints from protruding beyond the upper surface of the housing 1.

[0053] In one embodiment, as Figure 4 shown, a first chamfer 1013 is provided on the upper peripheral wall of the first sub-through hole 1011, and a second chamfer 601 is provided on the lower peripheral wall of the sealing plate 6. Through the cooperation of the first chamfer 1013 and the second chamfer 601, it is convenient for the assembly of the sealing plate 6 and the housing 1, and can also reduce the wear between the sealing plate 6 and the housing 1. Since the first chamfer 1013 is provided on the outside and the second chamfer 601 is provided on the inside, the first chamfer 1013 can adopt a rounded corner to achieve a continuous transition. The second chamfer 601 can adopt a flat chamfer to reduce the processing difficulty.

[0054] Of course, in some other embodiments, the structures of the first chamfer 1013 and the second chamfer 601 can also select other existing structures according to needs, and the embodiments of the present invention do not impose too many restrictions on this.

[0055] In one embodiment, as Figure 3 and Figure 4 shown, the battery cell further includes an insulating plate 7, the insulating plate 7 is disposed in the second sub-through hole 1012, 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 provide an insulating effect for the sealing plate 6. Disposing the insulating plate 7 in the second sub-through hole 1012 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.

[0056] It should be noted that the embodiments of the present invention do 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 adhesive, 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] In one embodiment, as Figure 2As shown, an insulating rubber ring 8 and a sealing ring 9 are further provided between the terminal post 4 and the housing 1. The insulating rubber ring 8 is arranged at the upper end of the sealing ring 9. 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 second through hole which is sleeved outside the sealing ring 9. The insulating rubber ring 8 is located at the upper end of the sealing ring 9, playing a role in insulation and sealing. The sealing ring 9 is arranged between the insulating rubber ring 8 and the limiting part, which can further improve the sealing effect. The insulating rubber plate 10 is limited in cooperation with the terminal post 4 through the second through hole.

[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 rubber 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 shown, the housing 1 is further provided with an explosion-proof valve 11 located between a pair of first through holes 101. The explosion-proof valve 11 opens when the internal air pressure of the battery cell is greater than the preset air pressure, so that the chamber inside the battery cell is communicated with the outside through the explosion-proof valve 11, and the high-pressure gas is discharged to avoid explosion due to too high internal air pressure of the battery cell.

[0060] It should be noted that the embodiment of the present invention does not limit the shape of the first through hole 101, and regular holes or irregular holes can be selected according to needs. In addition, the shape of the sealing plate 6 needs to be adaptively set with the first through hole 101 to achieve the sealing effect. In order to reduce the processing difficulty of the first through hole 101 and the installation difficulty of the sealing plate 6, in one embodiment, the first through hole 101 is a regular hole, and the regular hole includes any one of a polygonal hole, a circular hole, an elliptical hole and a runway-shaped hole, which is beneficial to improving the production efficiency of the battery cell.

[0061] Exemplarily, as Figure 5 shown, the first through hole 101 is a rectangular hole, and the length direction of the rectangular hole is consistent with the width direction of the housing 1. Correspondingly, the sealing plate 6 is a rectangular plate.

[0062] According to an embodiment of the present invention, on the other hand, a battery pack is further provided, mainly including: a plurality of battery cells.

[0063] Since the battery pack includes battery cells and has the same effect as the battery cells, that is, a first through hole 101 is formed in the housing 1, one end of the connecting piece 5 is connected to the tab 3 at the first through hole 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 is arranged offset from the tab 3, further reducing the thickness dimension and improving the space utilization rate of the battery cell. In addition, a stepped surface 102 is provided at the lower end of the first through hole 101 to mount the sealing plate 6. The stepped surface 102 can effectively limit and support the sealing plate 6. The periphery of the sealing plate 6 is connected to the hole wall of the first through hole 101, with firm connection and high reliability.

[0064] 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 restrictions.

[0065] 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 first through holes and a pair of mounting holes at intervals along the length direction, the pair of first through holes being located between the pair of mounting holes, a plurality of pole groups and a plurality of pairs of pole ears corresponding to the pole groups are provided in the shell, and a step surface is provided along the circumferential side of the lower end of the first 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 of the connecting piece extends to the first through hole and is connected to the pole ear; A pair of sealing plates are respectively arranged in the first through holes, the lower ends of the sealing plates are connected to the step surface, and the peripheral walls of the sealing plates are connected to the hole walls of the first through holes.

2. The battery cell according to claim 1, characterized in that: The first through hole includes a first sub-through hole and a second sub-through hole that are connected, the step surface is formed between the first sub-through hole and the second sub-through hole, the first sub-through hole is arranged at the upper end of the second sub-through hole, the bottom surface of the sealing plate abuts against the step surface, and the peripheral wall of the sealing plate is welded to the hole wall of the first sub-through hole.

3. The battery cell according to claim 2, characterized in that: The relationship between the thickness T1 of the first sub-through hole and the thickness T2 of the shell is 0.25T1≤T2≤0.8T1.

4. The battery cell according to claim 3, characterized in that: The thickness T3 of the sealing plate is 0.2 mm to 0.4 mm smaller than the thickness T1 of the first sub-through hole.

5. The battery cell according to claim 2, characterized in that: The upper peripheral wall of the first sub-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 claim 2, characterized in that: It also includes an insulating plate, which is arranged in the second sub-through hole, and the top surface of the insulating plate is connected to the bottom surface of the sealing plate.

7. The battery cell according to any one of claims 1 to 6, 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 second through hole. The second through hole is sleeved outside the sealing ring.

8. The battery cell according to any one of claims 1 to 6, characterized in that: The housing is also provided with an explosion-proof valve located between a pair of the first through holes.

9. The battery cell according to any one of claims 1 to 6, characterized in that: The first through hole is a regular hole, and the regular hole includes any one of a polygonal hole, a circular hole, an elliptical hole and a racetrack-shaped hole.

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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