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. Wherein the battery cell comprises a pole group, a shell and a sealing plate, the shell is provided with a containing cavity for containing the pole group, two through holes are formed in the top wall of the shell at intervals in the length direction of the shell, a negative pole lug and a positive pole lug penetrate through the two through holes respectively, and the inner wall of each through hole is arranged to be a first inclined surface inclined towards the axis of the through hole from top to bottom; the sealing plates cover the through holes in a one-to-one correspondence mode, the side walls of the sealing plates are arranged to be second slopes matched with the first slopes, and the side walls of the sealing plates are welded to the inner walls of the through holes. According to the utility model, the top wall of the shell is provided with the through hole, and the welding bottom plate and the tab can be welded and connected through the through hole, so that the tab is prevented from being bent after being welded to occupy a space, the length of the tab is shortened, the use space of the accommodating cavity in the shell in the length direction is increased, and the utilization rate of the internal space of the battery cell is increased.

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 increasing maturity of battery technology, batteries are widely used in electric vehicles and energy storage fields, and the requirements for the use performance and safety of batteries are increasing day by day. A battery cell is the basic component unit of a battery and can independently generate and store electrical energy.

[0003] In the prior art, both the connecting piece and the tab need to be bent, and the connecting piece, the terminal and the tab are usually located on the same vertical plane, so a large space inside the battery cell needs to be occupied, resulting in 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 of low space utilization rate of the battery cell.

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

[0006] A pole group, with a negative tab and a positive tab provided at one end;

[0007] A housing, provided with a receiving cavity for receiving the pole group, two through holes are spaced apart along the length direction of the top wall of the housing, and the two through holes are respectively for the negative tab and the positive tab to pass through, and the inner wall of each through hole is provided with a first inclined surface that inclines downward from top to bottom towards the axis of the through hole;

[0008] A sealing plate, covering the through hole correspondingly, the side wall of the sealing plate is provided with a second inclined surface adapted to the first inclined surface, and the side wall of the sealing plate is welded to the inner wall of the through hole.

[0009] Advantageous Effects: For this battery cell, when assembling the battery cell, first, the pole group is inserted into the receiving cavity from the opening at the bottom of the housing. Since there are two through holes on the top wall of the housing and the positions of the two through holes correspond to those of the negative tab and the positive tab, the negative tab and the positive tab on the pole group respectively pass through the two through holes on the top wall. Installers can bend the negative tab and the positive tab through the through holes so that the negative tab and the positive tab respectively abut against the negative welding bottom plate and the positive welding bottom plate. Installers can also weld and fix the negative welding bottom plate and the negative tab, and the positive welding bottom plate and the positive tab through the through holes. Finally, cover the sealing plate at the through hole and seal the receiving cavity to complete the assembly of the battery cell.

[0010] By providing a through-hole on the top wall of the housing, the welding bottom plate and the tab can be welded and connected through the through-hole, thereby avoiding the space occupied by the bending of the tab after welding, shortening the length of the tab, increasing the usable space of the accommodation cavity in the housing in the length direction, and thus improving the internal space utilization rate of the battery cell. Since the inner wall of the through-hole is inclined, through the first inclined surface of the through-hole and the second inclined surface of the sealing plate, it is possible to ensure close contact between the sealing plate and the through-hole, improve the sealing performance, reduce the risk of electrolyte leakage, and the welding of the side wall of the sealing plate and the inner wall of the through-hole enhances the connection strength and further improves the sealing effect.

[0011] In an alternative embodiment, the inclination angle between the first inclined surface and the lower surface of the top wall ranges from 2° to 88°.

[0012] Advantageous effects: By setting the inclination angle of the first inclined surface between 2° and 88°, it is possible to ensure close contact between the sealing plate and the through-hole, contribute to improving the sealing effect between the sealing plate and the inner wall of the through-hole, improve the sealing performance, and reduce the risk of electrolyte leakage.

[0013] In an alternative embodiment, the thickness of the sealing plate is less than the groove depth of the through-hole.

[0014] Advantageous effects: By setting the thickness of the sealing plate to be less than the groove depth of the through-hole, on the one hand, it can ensure that the convex points at the welding joint of the sealing plate and the top wall do not protrude above the upper surface of the top wall, guarantee the flatness of the top surface of the housing, facilitate the assembly of other subsequent components, and avoid interference between the welding convex points and other components during the assembly process. On the other hand, it ensures that after the sealing plate and the through-hole are matched, the sealing plate only occupies the space at the top wall, avoiding the sealing plate extending into the housing and occupying the internal space of the housing, thereby improving the internal space utilization rate of the battery cell.

[0015] In an alternative embodiment, the thickness of the sealing plate is t, and the thickness of the top wall is T, where 0.25T ≤ t ≤ 0.8T.

[0016] Advantageous effects: By controlling the ratio of the thickness of the sealing plate to the thickness of the top wall, on the one hand, it can ensure close contact between the sealing plate and the top wall, improve the sealing performance, and at the same time ensure the strength after the sealing plate and the top wall are welded. On the other hand, it can improve the structural stability of the entire assembly and reduce loosening or deformation caused by vibration or external forces during use.

[0017] In an alternative embodiment, the upper surface of the sealing plate is lower than the upper surface of the top wall, and the height difference between the upper surface of the sealing plate and the upper surface of the top wall is a, where 0.15 mm ≤ a ≤ 0.5 mm.

[0018] Beneficial effects: By controlling the height difference between the upper surface of the sealing plate and the upper surface of the top wall, it can be ensured that the bumps at the welding joint of the sealing plate and the top wall do not protrude above the upper surface of the housing, guaranteeing the flatness of the top surface of the housing and facilitating the assembly of other subsequent components.

[0019] In an alternative embodiment, a first chamfer is provided at the top of the inner wall of each through hole around the through hole, and a second chamfer is provided at the bottom of the side wall of each sealing plate around the sealing plate.

[0020] Beneficial effects: The design of the first chamfer and the second chamfer helps to guide the sealing plate accurately into the through hole, simplifies the assembly process, reduces the friction between the sealing plate and the inner wall of the through hole during the assembly process, and facilitates the smooth insertion of the sealing plate into the through hole.

[0021] In an alternative embodiment, the sealing plate includes a sealing plate body and a plastic plate, and the plastic plate is provided on one side of the sealing plate body and is located between the negative electrode tab and the positive electrode tab and the sealing plate body.

[0022] Beneficial effects: By providing a plastic plate between the negative electrode tab and the positive electrode tab and the sealing plate body, the plastic plate prevents the negative electrode tab and the positive electrode tab from directly contacting the sealing plate body, avoiding short - circuit of the battery cell. At the same time, the plastic plate can improve the sealing performance between the sealing plate and the top wall, ensure the sealing inside the battery cell, and prevent electrolyte leakage.

[0023] In an alternative embodiment, it further includes a negative welding bottom plate and a positive welding bottom plate. The negative welding bottom plate and the positive welding bottom plate are respectively arranged in one - to - one correspondence with the negative electrode tab and the positive electrode tab and are provided below the top wall. The negative welding bottom plate and the positive welding bottom plate respectively extend to the corresponding through holes.

[0024] Beneficial effects: By arranging the positive welding bottom plate and the negative welding bottom plate at the bottom of the bottom wall and extending them to the through holes, and by bending the negative electrode tab and the positive electrode tab, the negative welding bottom plate and the positive welding bottom plate are made to abut against the negative electrode tab and the positive electrode tab correspondingly. Installers can weld and fix the negative welding bottom plate and the negative electrode tab, and the positive welding bottom plate and the positive electrode tab through the through holes.

[0025] In an alternative embodiment, it further includes a plastic part. The plastic part is provided between the negative welding bottom plate and the positive welding bottom plate and the top wall, and through holes corresponding to the through holes are provided on the plastic part.

[0026] Beneficial effects: A plastic part is provided between the positive welding bottom plate and the negative welding bottom plate and the top wall. The plastic part ensures insulation between the positive welding bottom plate and the negative welding bottom plate and the top wall. Since a through hole corresponding to the through hole is provided on the plastic part, the negative pole tab and the positive pole tab can pass through the through hole of the plastic part and pass out through the through hole.

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

[0028] Beneficial effects: This battery pack includes the battery cells as described above and has all the beneficial technical effects of the battery cells, which will not be elaborated here. 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 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, without creative efforts, other drawings can also be obtained based on these drawings.

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

[0031] Figure 2 It is a cross-sectional view of a battery cell according to an embodiment of the present invention;

[0032] Figure 3 It is Figure 2 a partial enlarged schematic view of the top wall area in

[0033] Figure 4 It is Figure 3 a partial enlarged schematic view of the sealing plate and the through hole in

[0034] Figure 5 It is a schematic structural diagram of a battery cell without a sealing plate according to an embodiment of the present invention;

[0035] Figure 6 It is a schematic structural diagram of a pole group in a battery cell according to an embodiment of the present invention.

[0036] Description of the reference numerals:

[0037] 1. Housing; 101. Top wall; 1011. Through hole; 10111. First chamfer; 2. Negative pole tab; 3. Positive pole tab; 4. Pole group; 5. Sealing plate; 501. Second chamfer; 502. Sealing plate body; 503. Plastic plate; 6. Negative welding bottom plate; 7. Positive welding bottom plate; 8. Plastic part; 9. Bottom plate. Detailed embodiments

[0038] 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. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0039] In the related art, both the connecting piece and the tab need to be bent, and the connecting piece, the pole column, and the tab are usually located on the same vertical plane. Therefore, a relatively large space inside the battery cell needs to be occupied, resulting in a low space utilization rate of the battery cell.

[0040] To solve the above technical problems, the embodiments of the present utility model will be described below in conjunction with Figures 1 to 6 , to describe the embodiments of the present utility model.

[0041] According to the embodiments of the present utility model, on the one hand, as Figures 1 to 6 shown, a battery cell is provided, including a pole group 4, a housing 1, and a sealing plate 5.

[0042] Specifically, a negative tab 2 and a positive tab 3 are provided at one end of the pole group 4.

[0043] Specifically, as Figures 1 to 5 shown, the housing 1 is provided with a receiving cavity (not shown in the figure) and an opening (not shown in the figure). The pole group 4 is installed in the receiving cavity, and the opening communicates with the receiving cavity. Among them, the opening is provided at the bottom of the housing 1. Two through holes 1011 are spaced apart along the length direction of the top wall 101 of the housing 1. The negative tab 2 and the positive tab 3 respectively pass through the two through holes 1011. The inner wall of each through hole 1011 is inclined, and the inner wall of each through hole 1011 is provided with a first inclined surface that is inclined downward from top to bottom toward the axis of the through hole 1011.

[0044] Specifically, as Figure 4 shown, the sealing plate 5 is correspondingly arranged with the through hole 1011. The sealing plate 5 covers the position of the through hole 1011. The side wall of the sealing plate 5 is provided with a second inclined surface adapted to the first inclined surface, and the side wall of the sealing plate 5 is welded to the inner wall of the through hole 1011.

[0045] For this battery cell, when assembling the battery cell, first insert the electrode assembly 4 into the accommodation cavity through the opening at the bottom of the housing 1. Since there are two through holes 1011 provided on the top wall 101 of the housing 1, and the positions of the two through holes 1011 correspond to those of the negative electrode tab 2 and the positive electrode tab 3, respectively, the negative electrode tab 2 and the positive electrode tab 3 on the electrode assembly 4 pass through the two through holes 1011 on the top wall 101. The installer can bend the negative electrode tab 2 and the positive electrode tab through the through holes 1011 so that the negative electrode tab 2 and the positive electrode tab respectively abut against the negative electrode welding base plate 6 and the positive electrode welding base plate 7. The installer can also weld and fix the negative electrode welding base plate 6 and the negative electrode tab 2, and the positive electrode welding base plate 7 and the positive electrode tab 3 through the through holes 1011. Finally, cover the sealing plate 5 at the through holes 1011 and seal the accommodation cavity to complete the assembly of the battery cell.

[0046] By providing the through holes 1011 on the top wall 101 of the housing 1, the welding connection between the welding base plate 9 and the electrode tab can be achieved through the through holes 1011, thereby avoiding the space occupied by the bending of the electrode tab after welding, shortening the length of the electrode tab, increasing the usable space of the accommodation cavity in the housing 1 in the length direction, and thus improving the utilization rate of the internal space of the battery cell. Since the inner wall of the through hole 1011 is inclined, by matching the first inclined surface of the through hole 1011 with the second inclined surface of the sealing plate 5, it can be ensured that there is close contact between the sealing plate 5 and the through hole 1011, improving the sealing performance and reducing the risk of electrolyte leakage. The welding of the side wall of the sealing plate 5 and the inner wall of the through hole 1011 enhances the connection strength and further improves the sealing effect.

[0047] Specifically, the housing 1 can be set in any shape such as a cuboid or a cube. In the embodiment of the present application, the shape of the housing 1 is not specifically limited. Exemplarily, the housing 1 can be set as a cuboid, and the accommodation cavity is set in a cuboid shape similar to the housing 1.

[0048] Specifically, the through holes 1011 can be provided in the middle area or the end area close to the top wall 101 of the top wall 101, as long as the positions of the positive electrode tab 3 and the negative electrode tab 2 correspond to the positions of the through holes 1011. The through holes 1011 can be set in any existing shape such as a rounded rectangular hole, a square hole, or a circular hole. In the embodiment of the present application, the shape of the through holes 1011 and their positions on the top wall 101 are not specifically limited.

[0049] Specifically, in the direction from the upper surface of the top wall 101 to the lower surface of the top wall 101, the size of the through hole 1011 gradually shrinks. It can be understood that when the through hole 1011 is circular, in the direction from the upper surface of the top wall 101 to the lower surface of the top wall 101, the diameter of the through hole 1011 gradually shrinks. When the through hole 1011 is square or rectangular, in the direction from the upper surface of the top wall 101 to the lower surface of the top wall 101, the side length of the through hole 1011 gradually shrinks.

[0050] Specifically, the inclination angle of the inner wall of the through hole 1011 can be set to any angle, as long as it ensures that the inner wall of the through hole 1011 is in close contact with the side wall of the sealing plate 5. In the embodiments of the present application, no specific limitation is imposed on the inclination angle of the inner wall of the through hole 1011.

[0051] Specifically, as Figure 2 shown, a bottom plate 9 can be provided on the housing 1. After the electrode group 4 is loaded into the accommodating cavity, the bottom plate 9 can be covered on the opening to seal the electrode group 4 in the accommodating cavity.

[0052] In one embodiment, as Figure 4 shown, the inclination angle between the first inclined surface and the lower surface of the top wall 101 ranges from 2° to 88°.

[0053] By setting the inclination angle of the first inclined surface between 2° and 88°, it is possible to ensure the close contact between the sealing plate 5 and the through hole 1011, which helps to improve the sealing effect between the sealing plate 5 and the inner wall of the through hole 1011, enhance the sealing performance, and reduce the risk of electrolyte leakage.

[0054] Exemplarily, when the inclination angle between the first inclined surface and the lower surface of the top wall 101 is 2°, that is, the inclination angle of the inner wall of the through hole 1011 is relatively large, and the contact area between the inner wall of the through hole 1011 and the side wall of the sealing plate 5 is also relatively large, ensuring the close contact between the sealing plate 5 and the through hole 1011 and improving the sealing performance. When the inclination angle between the first inclined surface and the lower surface of the top wall 101 is 88°, that is, the inclination angle of the inner wall of the through hole 1011 is relatively small, and the contact area between the inner wall of the through hole 1011 and the side wall of the sealing plate 5 is also relatively small. While ensuring the close contact between the sealing plate 5 and the through hole 1011, it is convenient for the production and manufacture of the sealing plate 5 and the through hole 1011.

[0055] In one embodiment, as Figure 4 shown, the thickness of the sealing plate 5 is less than the groove depth of the through hole 1011.

[0056] By setting the thickness of the sealing plate 5 to be less than the groove depth of the through hole 1011, on the one hand, it can ensure that the convex points at the welding joint of the sealing plate 5 and the top wall 101 do not protrude above the upper surface of the top wall 101, guarantee the flatness of the top surface of the housing 1, which is beneficial to the subsequent assembly of other components and avoids interference between the welding convex points and other components during the assembly process. On the other hand, it ensures that after the sealing plate 5 is matched with the through hole 1011, the sealing plate 5 only occupies the space at the top wall 101, avoiding the sealing plate 5 extending into the housing 1 and occupying the internal space of the housing 1, thereby improving the utilization rate of the internal space of the battery cell.

[0057] Specifically, the thickness of the sealing plate 5 and the groove depth of the through hole 1011 are related to the thickness of the housing 1. When designing the thickness of the sealing plate 5 and the groove depth of the through hole 1011, they can be adjusted according to the thickness of the housing 1. In the embodiments of the present application, the thickness of the sealing plate 5 and the groove depth of the through hole 1011 are not specifically limited.

[0058] In one embodiment, as Figure 4 shown, the thickness of the sealing plate 5 is t, and the thickness of the top wall 101 is T, where 0.25T ≤ t ≤ 0.8T.

[0059] By controlling the ratio of the thickness of the sealing plate 5 to the thickness of the top wall 101, on the one hand, it can ensure the close contact between the sealing plate 5 and the top wall 101, improve the sealing performance, and at the same time ensure the strength after the sealing plate 5 and the top wall 101 are welded. On the other hand, it can improve the structural stability of the entire assembly and reduce loosening or deformation caused by vibration or external forces during use.

[0060] In one embodiment, as Figure 4 shown, the upper surface of the sealing plate 5 is located below the upper surface of the top wall 101, and the height difference between the upper surface of the sealing plate 5 and the upper surface of the top wall 101 is a, where 0.15 mm ≤ a ≤ 0.5 mm.

[0061] By controlling the height difference between the upper surface of the sealing plate 5 and the upper surface of the top wall 101, it can be ensured that the bumps at the welding joint of the sealing plate 5 and the top wall 101 do not protrude above the upper surface of the housing 1, ensuring the flatness of the top surface of the housing 1 and facilitating the assembly of other subsequent components.

[0062] Exemplarily, when a is 0.15 mm, the height difference between the upper surface of the sealing plate 5 and the upper surface of the top wall 101 is relatively small, and when a is 0.5 mm, the height difference between the upper surface of the sealing plate 5 and the upper surface of the top wall 101 is relatively large.

[0063] In one embodiment, as Figure 4 shown, on the inner wall top of each through hole 1011 around the through hole 1011, a first chamfer 10111 is provided, and on the bottom of the side wall of each sealing plate 5 around the sealing plate 5, a second chamfer 501 is provided.

[0064] The design of the first chamfer 10111 and the second chamfer 501 helps to guide the sealing plate 5 to be accurately inserted into the through hole 1011, simplifies the assembly process, reduces the friction between the sealing plate 5 and the inner wall of the through hole 1011 during the assembly process, and facilitates the smooth insertion of the sealing plate 5 into the through hole 1011.

[0065] Specifically, the first chamfer 10111 and the second chamfer 501 can be set as an arc chamfer or an inclined chamfer, etc. In the embodiments of the present application, the types of the first chamfer 10111 and the second chamfer 501 are not specifically limited.

[0066] In one embodiment, in combination with Figure 4 and Figure 6 as shown, the sealing plate 5 includes a sealing plate body 502 and a plastic plate 503. The plastic plate 503 is disposed on one side of the sealing plate body 502 and is located between the negative electrode tab 2, the positive electrode tab 3 and the sealing plate body 502.

[0067] By providing the plastic plate 503 between the negative electrode tab 2, the positive electrode tab 3 and the sealing plate body 502, the plastic plate 503 prevents the negative electrode tab 2 and the positive electrode tab 3 from directly contacting the sealing plate body 502, avoiding short circuit of the battery cell. At the same time, the plastic plate 503 can improve the sealing performance between the sealing plate 5 and the top wall 101, ensure the sealing inside the battery cell, and prevent electrolyte leakage.

[0068] Specifically, the sealing plate body 502 and the plastic plate 503 can be fixed by bonding, or can be fixed by injection molding or hot melting. In the embodiments of the present application, the connection method between the sealing plate body 502 and the plastic plate 503 is not specifically limited.

[0069] Specifically, the plastic plate 503 can be made of PP material. In the embodiments of the present application, the material of the plastic plate 503 is not specifically limited.

[0070] In one embodiment, in combination with Figure 3 、 Figure 5 and Figure 6 as shown, it further includes a negative electrode welding bottom plate 6 and a positive electrode welding bottom plate 7. The negative electrode welding bottom plate 6 and the positive electrode welding bottom plate 7 are respectively arranged in one-to-one correspondence with the negative electrode tab 2 and the positive electrode tab 3, and the negative electrode welding bottom plate 6 and the positive electrode welding bottom plate 7 are disposed below the top wall 101, and the negative electrode welding bottom plate 6 and the positive electrode welding bottom plate 7 respectively extend to the corresponding through holes 1011.

[0071] By arranging the positive electrode welding bottom plate 7 and the negative electrode welding bottom plate 6 at the bottom of the bottom wall, and the positive electrode welding bottom plate 7 and the negative electrode welding bottom plate 6 extend to the through holes 1011, by bending the negative electrode tab 2 and the positive electrode tab 3, the negative electrode welding bottom plate 6 and the positive electrode welding bottom plate 7 are correspondingly abutted against the negative electrode tab 2 and the positive electrode tab 3, and the installer can weld and fix the negative electrode welding bottom plate 6 and the negative electrode tab 2, the positive electrode welding bottom plate 7 and the positive electrode tab 3 through the through holes 1011.

[0072] Specifically, the negative electrode welding base plate 6 and the negative electrode terminal can be fixed on the top wall 101 by riveting, and the positive electrode welding base plate 7 and the positive electrode terminal can be fixed on the top wall 101 by riveting.

[0073] In one embodiment, as Figure 3 shown, it further includes a plastic part 8. The plastic part 8 is arranged between the negative electrode welding base plate 6 and the positive electrode welding base plate 7 and the top wall 101, and a through hole corresponding to the through hole 1011 is formed in the plastic part 8.

[0074] By arranging the plastic part 8 between the positive electrode welding base plate 7 and the negative electrode welding base plate 6 and the top wall 101, the insulation between the positive electrode welding base plate 7 and the negative electrode welding base plate 6 and the top wall 101 is ensured through the plastic part 8. Since a through hole corresponding to the through hole 1011 is formed in the plastic part 8, the negative electrode tab 2 and the positive electrode tab 3 can pass through the through hole of the plastic part 8 and pass out through the through hole 1011.

[0075] Specifically, the size and position of the through hole can be adapted to the size and position of the through hole 1011. In the embodiment of the present application, the shape of the through hole is not specifically limited.

[0076] The installation process of the battery cell in this embodiment is described as follows:

[0077] First, the end plate is arranged on the electrode group 4 and the negative electrode tab 2 and the positive electrode tab 3 are made to pass through the through holes of the end plate, and then the insulating film is folded into a shape adapted to the electrode group 4, and the insulating film is sleeved on the electrode group 4 to ensure that the insulating film is firmly fixed.

[0078] Subsequently, the electrode group 4 is loaded into the accommodation cavity from the opening at the bottom of the housing 1, so that the negative electrode tab 2 and the positive electrode tab 3 on the electrode group 4 pass through the through hole of the plastic part 8 and the through hole 1011 on the top wall 101. Among them, when the housing 1 comes in, the plastic part 8 has been installed at the lower part of the top wall 101.

[0079] After the electrode group 4 is loaded into the housing 1, the base plate 9 is welded at the installation opening so that the electrode group 4 is sealed in the housing 1.

[0080] Then the negative electrode tab 2 and the positive electrode tab 3 are bent into an "L" shape, and then the negative electrode tab 2 is welded to the negative electrode welding base plate 6, and the positive electrode tab 3 is welded to the positive electrode welding base plate 7.

[0081] After the welding of the welding base plate 9 and the tab is completed, the electrolyte can be injected into the battery cell through the through hole 1011. When the injection is completed, the sealing plate 5 is covered at the through hole 1011 and the accommodation cavity is sealed to complete the assembly of the battery cell.

[0082] According to the embodiment of the present invention, on the other hand, as Figures 1 to 6 shown, a battery pack is further provided, which includes a plurality of battery cells.

[0083] This battery pack includes the battery cells as described above and has all the beneficial technical effects of the battery cells, which will not be elaborated herein.

[0084] Although 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, Comprising: A pole group, with a negative pole tab and a positive pole tab provided at one end; A housing, having a receiving cavity for receiving the pole group, two through holes being spaced apart along the length direction of the top wall of the housing, the negative pole tab and the positive pole tab respectively passing through the two through holes, and the inner wall of each through hole being provided with a first inclined surface that inclines downward from top to bottom towards the axis of the through hole; A sealing plate, covering the through holes one by one, the side wall of the sealing plate being provided with a second inclined surface adapted to the first inclined surface, and the side wall of the sealing plate being welded to the inner wall of the through hole.

2. The battery cell according to claim 1, wherein, The inclination angle range between the first inclined surface and the lower surface of the top wall is between 2° and 88°.

3. The battery cell according to claim 1, characterized in that, The thickness of the sealing plate is less than the groove depth of the through hole.

4. The battery cell according to claim 3, wherein, The thickness of the sealing plate is t, and the thickness of the top wall is T, 0.25T ≤ t ≤ 0.8T.

5. The battery cell according to claim 1, characterized in that, The upper surface of the sealing plate is lower than the upper surface of the top wall, and the height difference between the upper surface of the sealing plate and the upper surface of the top wall is a, 0.15 mm ≤ a ≤ 0.5 mm.

6. The cell according to claim 1, wherein On each through hole, a first chamfer is provided around the top of the inner wall of the through hole, and on each sealing plate, a second chamfer is provided around the bottom of the side wall of the sealing plate.

7. The battery cell according to any one of claims 1 to 6, characterized in that, The sealing plate includes a sealing plate body and a plastic plate, and the plastic plate is provided on one side of the sealing plate body and is located between the negative pole tab and the positive pole tab and the sealing plate body.

8. The battery cell according to any one of claims 1 to 6, characterized in that Also included are a negative welding bottom plate and a positive welding bottom plate, the negative welding bottom plate and the positive welding bottom plate being respectively provided corresponding to the negative pole tab and the positive pole tab and being located below the top wall, and the negative welding bottom plate and the positive welding bottom plate respectively extending to the corresponding through holes.

9. The battery cell according to claim 8, wherein, Also included is a plastic part, the plastic part being provided between the negative welding bottom plate and the positive welding bottom plate and the top wall, and a through hole corresponding to the through hole being provided on the plastic part.

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

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