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 shell, a pole group, a cover plate, a welding bottom plate and a sealing cover, the shell is provided with a containing cavity and an opening communicated with the containing cavity, the pole group is arranged in the containing cavity, a pole lug is arranged at the end part of the pole group, the cover plate covers the opening, a through hole is formed in a position, corresponding to the pole lug, on the cover plate, and the welding bottom plate is arranged at the bottom of the cover plate. An end plate is arranged between the welding bottom plate and the pole group, a plastic part is arranged between the welding bottom plate and the cover plate, the end plate and the plastic part are both provided with through holes for the pole lugs to penetrate through, and the welding bottom plate is fixedly connected with the pole lugs through welding. Therefore, the space occupied by bending of the tabs after welding is avoided, the length of the tabs is shortened, and the use space of the accommodating cavity in the shell in the length direction is increased, so that the utilization rate of the internal space of the battery cell is increased, the assembly process is simplified, and the assembly efficiency is improved.

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, due to its unique structural design, the production and manufacturing process of a blade battery follows specific steps. First, a negative electrode cover plate needs to be assembled, then the electrode group is assembled into the shell body, and then the positive electrode cover plate is assembled. However, during the assembly process of the positive electrode cover plate, in order to ensure the accuracy and safety of the operation, a certain operation space needs to be reserved, resulting in a certain loss of the internal space of the shell body. 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 a certain operation space needs to be reserved during the assembly process of the positive electrode cover plate, resulting in a certain loss of the internal space of the shell body.

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

[0006] A shell body, which is provided with a receiving cavity and an opening communicating with the receiving cavity;

[0007] An electrode group, which is arranged in the receiving cavity and electrode tabs are arranged at the ends of the electrode group;

[0008] A cover plate, which is covered at the opening, and through holes are formed at positions corresponding to the electrode tabs on the cover plate;

[0009] A welding bottom plate, which is arranged at the bottom of the cover plate, an end plate is arranged between the welding bottom plate and the electrode group, a plastic part is arranged between the welding bottom plate and the cover plate, through holes for the electrode tabs to pass through are formed on both the end plate and the plastic part, the welding bottom plate extends to the through holes and abuts against the electrode tabs, and the welding bottom plate and the electrode tabs are fixedly connected by welding;

[0010] A sealing cover, which is covered at the through holes and seals the receiving cavity.

[0011] Beneficial effects: When assembling the battery cell, first insert the electrode group into the accommodation cavity from the opening of the housing. Then, set the welding bottom plate at the bottom of the cover plate, and set a plastic part between the welding bottom plate and the cover plate to ensure insulation between the welding bottom plate and the cover plate through the plastic part. Since the end plate is provided with a through hole, set the end plate on the electrode group and make the tab pass through the through hole of the end plate, so that the electrode group is insulated from the welding bottom plate through the end plate. Subsequently, cover the cover plate at the opening of the housing. The position of the through hole on the cover plate corresponds to the position of the tab, and the tab passes through the through hole of the plastic part and exits from the through hole. The welding bottom plate extends to the through hole, and the tab is bent to abut against the welding bottom plate, and the installer can weld and fix the welding bottom plate and the tab through the through hole. Finally, cover the sealing cover at the through hole and seal the accommodation cavity to complete the assembly of the battery cell.

[0012] By opening a through hole on the cover plate, on the one hand, the welding bottom plate and the tab can be welded and connected through the through hole, thereby avoiding the space occupied by the tab after welding and bending, shortening the length of the tab, improving the utilization space of the accommodation cavity in the housing in the length direction, thus improving the internal space utilization rate of the battery cell, and at the same time simplifying the assembly process and improving the assembly efficiency. On the other hand, liquid can be injected into the accommodation cavity through the through hole, and there is no need to separately open a liquid injection hole on the housing or the cover plate.

[0013] In an optional embodiment, the tab is bent, and the bent section of the tab is located between the welding bottom plate and the cover plate, and the bottom surface of the bent section abuts against the top surface of the welding bottom plate.

[0014] Beneficial effects: Setting the bent section of the tab between the welding bottom plate and the cover plate can reduce the space occupied by the tab inside the housing, improve the utilization rate of the internal space of the housing, and thus improve the energy density of the battery cell. The close contact between the tab and the welding bottom plate can ensure stable electrical connection, improve the reliability of the electrical connection, avoid the risk of poor contact or short circuit, and improve the overall safety of the product.

[0015] In an optional embodiment, the tab is bent in an "L" shape.

[0016] Beneficial effects: During the process of assembling the battery cell, after the tab passes through the through holes of the end plate and the plastic part and the through hole of the cover plate, only by bending the tab in an "L" shape can the tab abut against the welding bottom plate, which not only improves the reliability of the electrical connection and the structural stability, but also simplifies the assembly process.

[0017] In an optional embodiment, an installation part is provided on the outer surface of the cover plate around the through hole, the installation part protrudes from the outer surface of the cover plate, and the sealing cover is covered on the installation part.

[0018] Beneficial effects: By arranging the installation part on the outer surface of the cover plate, the occupation of the internal space can be reduced, the usable space of the accommodation cavity in the shell in the length direction can be increased, and the utilization rate of the internal space of the battery cell can be improved. The installation part helps to improve the stability of the overall structure, ensures that the sealing cover is firmly sealed and fixed on the cover plate, and reduces loosening or deformation caused by vibration or external force during use.

[0019] In an alternative embodiment, a stepped groove is provided on the inner side of the installation part, a stepped surface corresponding to the stepped groove is provided around the sealing cover, and the sealing cover and the installation part are hermetically connected through the cooperation of the stepped groove and the stepped surface.

[0020] Beneficial effects: By providing a stepped groove on the inner side of the installation part and a stepped surface around the sealing cover, the cooperation of the stepped groove and the stepped surface can improve the sealing performance between the sealing cover and the installation part, ensure the sealing inside the battery cell, prevent electrolyte leakage, and at the same time, simplify the assembly process of the sealing cover through the cooperation of the stepped groove and the stepped surface, and improve the assembly efficiency.

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

[0022] Beneficial effects: By arranging a sealing plastic plate between the tab and the cover body, the sealing plastic plate can prevent the tab from directly contacting the cover body, avoid short-circuiting of the battery cell, and at the same time, the sealing plastic plate can improve the sealing performance between the sealing cover and the cover body, ensure the sealing inside the battery cell, and prevent electrolyte leakage.

[0023] In an alternative embodiment, a plurality of exhaust holes are spaced apart on the sealing plastic plate.

[0024] Beneficial effects: By providing a plurality of exhaust holes on the sealing plastic plate, the exhaust holes can help release gas when the internal pressure of the battery cell is too high, prevent the accumulation of internal pressure, thereby improving the safety of the battery cell, helping to improve the stability of the overall structure, and reducing deformation or damage caused by internal pressure changes during use.

[0025] In an alternative embodiment, the area of the sealing plastic plate is adapted to the bottom area of the cover body.

[0026] Beneficial effects: The adaptation of the sealing plastic plate to the bottom surface of the cover body can ensure good sealing performance, prevent electrolyte leakage, improve the sealing of the battery cell, and at the same time, avoid the tab directly contacting the cover body to cause short-circuiting of the battery cell.

[0027] In an alternative embodiment, an explosion-proof valve is further included, and the explosion-proof valve is arranged on the cover body.

[0028] Beneficial effects: By providing an explosion-proof valve on the cover body, it can be automatically opened when the internal pressure of the battery cell is too high, releasing the internal pressure, preventing the battery cell from exploding or being damaged, and improving the overall safety of the product. Since the production cost of the cover body is relatively low, if the explosion-proof valve and the cover body are damaged during the welding process, only the cover body needs to be replaced, reducing the overall manufacturing cost caused by damage.

[0029] In a second aspect, the present utility model also provides a battery pack, including a plurality of battery cells.

[0030] Beneficial effects: This battery pack includes the battery cells as described above, so it has all the beneficial technical effects of the battery cells, which will not be elaborated here. Description of the Drawings

[0031] 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 following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 Structural schematic diagram of a battery cell according to an embodiment of the present utility model;

[0033] Figure 2 Explosion schematic diagram of a battery cell according to an embodiment of the present utility model;

[0034] Figure 3 Explosion schematic diagram of a battery cell from another perspective according to an embodiment of the present utility model;

[0035] Figure 4 Explosion schematic diagram of a sealing cover in a battery cell according to an embodiment of the present utility model;

[0036] Figure 5 Top view of a battery cell according to an embodiment of the present utility model;

[0037] Figure 6 For Figure 5 Cross-sectional view along direction A;

[0038] Figure 7 Front view of a battery cell according to an embodiment of the present utility model;

[0039] Figure 8 For Figure 7 Cross-sectional view along direction B.

[0040] Explanation of the reference numerals:

[0041] 1. Housing; 2. Electrode assembly; 201. Tab; 2011. Bent section; 3. End plate; 301. Through hole; 302. Air vent; 4. Plastic part; 5. Cover plate; 501. Through hole; 502. Mounting part; 5021. Step groove; 6. Welding bottom plate; 7. Terminal; 8. Sealing cover; 801. Cover body; 8011. Explosion-proof valve; 802. Sealing plastic plate; 8021. Exhaust hole; 803. Step surface; 9. Insulating sheet. Detailed implementation manners

[0042] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. 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.

[0043] In the related art, due to its unique structural design, the production and manufacturing process of the blade battery follows specific steps. First, the negative electrode cover plate needs to be assembled, then the electrode assembly is installed in the housing, and then the positive electrode cover plate is assembled. However, during the assembly of the positive electrode cover plate, in order to ensure the accuracy and safety of the operation, a certain operating space needs to be reserved, resulting in a certain loss of the internal space of the housing.

[0044] To solve the above technical problems, the embodiments of the present utility model will be described below in conjunction with Figures 1 to 8 , describing the embodiments of the present utility model.

[0045] According to the embodiments of the present utility model, on the one hand, as Figures 1 to 8 shown, a battery cell is provided, including a housing 1, an electrode assembly 2, a cover plate 5, a welding bottom plate 6 and a sealing cover 8.

[0046] Specifically, as Figure 1 and Figure 2 shown, the housing 1 is provided with a receiving cavity (not shown in the figure) and an opening (not shown in the figure), and the opening is communicated with the receiving cavity.

[0047] Specifically, as Figure 2 shown, the electrode assembly 2 is installed in the receiving cavity of the housing 1, and the end of the electrode assembly 2 is provided with a tab 201.

[0048] Specifically, as Figures 1 to 3 shown, the cover plate 5 is covered at the opening, wherein, the cover plate 5 is provided with a through hole 501, and the position of the through hole 501 corresponds to the position of the tab 201.

[0049] Specifically, as Figures 1 to 8As shown, the welding bottom plate 6 is arranged at the bottom of the cover plate 5. Among them, an end plate 3 is provided between the welding bottom plate 6 and the electrode group 2, and a plastic part 4 is provided between the welding bottom plate 6 and the cover plate 5. Through holes 301 are formed in both the end plate 3 and the plastic part 4, and the tab 201 is adapted to pass through the through holes 301. The welding bottom plate 6 extends to the through hole 501 of the cover plate 5 and abuts against the tab 201. The welding bottom plate 6 and the tab 201 are fixedly connected by welding.

[0050] Specifically, as Figures 1 to 3 shown, the sealing cover 8 is arranged at the position of the through hole 501, and the accommodating cavity is sealed by the sealing cover 8.

[0051] For this battery cell, when assembling the battery cell, first, the electrode group 2 is loaded into the accommodating cavity from the opening of the housing 1. Then, the welding bottom plate 6 is arranged at the bottom of the cover plate 5, and the plastic part 4 is arranged between the welding bottom plate 6 and the cover plate 5 to ensure insulation between the welding bottom plate 6 and the cover plate 5 through the plastic part 4. Since the through hole 301 is provided on the end plate 3, the end plate 3 is arranged on the electrode group 2 and the tab 201 passes through the through hole 301 of the end plate 3, so that the electrode group 2 and the welding bottom plate 6 are insulated through the end plate 3. Subsequently, the cover plate 5 is covered on the opening of the housing 1. The position of the through hole 501 on the cover plate 5 corresponds to the position of the tab 201, and the tab 201 passes through the through hole 301 of the plastic part 4 and exits from the through hole 501. The welding bottom plate 6 extends to the through hole 501, and the tab 201 is bent to abut against the welding bottom plate 6. The installer can weld and fix the welding bottom plate 6 and the tab 201 through the through hole 501. Finally, the sealing cover 8 is covered at the through hole 501 to seal the accommodating cavity, and the assembly of the battery cell is completed.

[0052] By providing the through hole 501 on the cover plate 5, on the one hand, the welding bottom plate 6 and the tab 201 can be welded and connected through the through hole 501, thereby avoiding the space occupied by the bending of the tab 201 after welding, shortening the length of the tab 201, improving the use space of the accommodating cavity in the housing 1 in the length direction, thus improving the internal space utilization rate of the battery cell, and at the same time simplifying the assembly process and improving the assembly efficiency. On the other hand, liquid can be injected into the accommodating cavity through the through hole 501 without separately providing a liquid injection hole on the housing 1 or the cover plate 5.

[0053] 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, the accommodating cavity is set in a cuboid shape similar to the housing 1, and the opening is provided at one end of the housing 1.

[0054] Specifically, the through hole 501 can be opened in the middle area of the cover plate 5 or in the end area close to the cover plate 5. It is only necessary to ensure that the position of the tab 201 corresponds to the position of the through hole 501. The through hole 501 can be set in any existing shape such as a rounded rectangular hole, a square hole, a circular hole, etc. In the embodiments of the present application, the shape of the through hole 501 and its position on the cover plate 5 are not specifically limited.

[0055] Specifically, as Figure 8 shown, the welding bottom plate 6 and the pole column 7 can be fixed on the cover plate 5 by riveting.

[0056] Specifically, the sealing cover 8 can be hermetically fixed at the through hole 501 by welding. In the embodiments of the present application, the connection manner between the sealing cover 8 and the cover plate 5 is not specifically limited.

[0057] Specifically, a plurality of air outlet holes 302 can be provided on the end plate 3, and the plurality of air outlet holes 302 are distributed at both ends of the end plate 3.

[0058] Specifically, the housing 1, the cover plate 5, the pole column 7, and the sealing cover 8 can be made of aluminum material.

[0059] Specifically, when the tab 201 is the positive electrode, the material of the welding bottom plate 6 is aluminum material; when the tab 201 is the negative electrode, the material of the welding bottom plate 6 is copper-aluminum composite material.

[0060] Specifically, the battery cell structure of the present application can be applied to a short blade battery cell. The length of the short blade battery cell is significantly shorter than that of the traditional long blade battery cell. The shorter size helps to improve the space utilization rate of the battery, enabling the battery to be adapted to a wider range of vehicle models. The short blade battery cell design is shorter, safer, and has a smaller internal resistance, so less heat is generated, which helps to enhance the safety performance of the battery cell.

[0061] In one embodiment, as Figure 6 shown, the tab 201 is bent, wherein the bent section 2011 of the tab 201 is arranged between the welding bottom plate 6 and the cover plate 5, and the bottom surface of the bent section 2011 is in contact with the top surface of the welding bottom plate 6.

[0062] Setting the bent section 2011 of the tab 201 between the welding bottom plate 6 and the cover plate 5 can reduce the space occupied by the tab 201 inside the housing 1, improve the space utilization rate inside the housing 1, and thus improve the energy density of the battery cell. The close contact between the tab 201 and the welding bottom plate 6 can ensure a stable electrical connection, improve the reliability of the electrical connection, avoid the risk of poor contact or short circuit, and improve the overall safety of the product.

[0063] Specifically, the bent section 2011 of the tab 201 can be set at any bending angle, as long as the bent section 2011 is in close contact with the welding base plate 6. In the embodiment of the present application, the bending angle of the bent section 2011 of the tab 201 is not specifically limited.

[0064] In one embodiment, as Figure 6 shown, the tab 201 is bent into an "L" shape.

[0065] During the process of assembling the battery cell, after passing the tab 201 through the through hole 301 of the end plate 3 and the plastic part 4 and the through hole 501 of the cover plate 5, only by bending the tab 201 into an "L" shape, the tab 201 can be brought into abutment with the welding base plate 6, which not only improves the reliability of electrical connection and the structural stability, but also simplifies the assembly process.

[0066] Specifically, when bending the tab 201, the tab 201 can be bent by 90°, so that the bent section 2011 of the tab 201 is in close contact with the top surface of the welding base plate 6.

[0067] In one embodiment, as Figure 2 、 Figure 6 and Figure 8 shown, the outer surface of the cover plate 5 is provided with an installation portion 502, the installation portion 502 protrudes from the outer surface of the cover plate 5, and the installation portion 502 is arranged around the periphery of the through hole 501. The sealing cover 8 is covered on the installation portion 502.

[0068] By arranging the installation portion 502 on the outer surface of the cover plate 5, the occupation of the internal space can be reduced, the usable space of the accommodation cavity in the housing 1 in the length direction is increased, and the utilization rate of the internal space of the battery cell is improved. The installation portion 502 helps to improve the overall structural stability, ensures that the sealing cover 8 is firmly sealed and fixed on the cover plate 5, and reduces loosening or deformation caused by vibration or external force during use.

[0069] Specifically, the installation portion 502 can be set in any existing shape such as a ring shape, a boss shape, etc. In the embodiment of the present application, the shape of the installation portion 502 is not specifically limited.

[0070] In one embodiment, as Figure 6 shown, a stepped groove 5021 is provided on the inner side of the installation portion 502, and a stepped surface 803 is provided around the sealing cover 8. Among them, the stepped surface 803 is correspondingly arranged with the stepped groove 5021. The sealing cover 8 and the installation portion 502 are hermetically connected through the cooperation of the stepped groove 5021 and the stepped surface 803.

[0071] By providing a stepped groove 5021 inside the installation part 502 and a stepped surface 803 around the sealing cover 8, the cooperation between the stepped groove 5021 and the stepped surface 803 can improve the sealing performance between the sealing cover 8 and the installation part 502, ensure the sealing inside the battery cell, prevent electrolyte leakage. At the same time, through the cooperation between the stepped groove 5021 and the stepped surface 803, the assembly process of the sealing cover 8 is simplified and the assembly efficiency is improved.

[0072] Specifically, during the installation of the sealing cover 8, through the cooperation between the stepped groove 5021 and the stepped surface 803, the sealing cover 8 can be quickly positioned, and by presetting the positions of the stepped groove 5021 and the stepped surface 803, it can be ensured that the top surface of the sealing cover 8 and the top surface of the cover body are in the same plane, ensuring the neat and beautiful appearance of the battery cell.

[0073] In one embodiment, as Figure 4 shown, the sealing cover 8 includes a cover body 801 and a sealing plastic plate 802. The sealing plastic plate 802 is provided on one side of the cover body 801, and the sealing plastic plate 802 is located between the tab 201 and the cover body 801.

[0074] By providing a sealing plastic plate 802 between the tab 201 and the cover body 801, the sealing plastic plate 802 can prevent the tab 201 from directly contacting the cover body 801, avoiding short - circuit of the battery cell. At the same time, the sealing plastic plate 802 can improve the sealing performance between the sealing cover 8 and the cover body, ensure the sealing inside the battery cell, and prevent electrolyte leakage.

[0075] Specifically, the cover body 801 and the sealing plastic plate 802 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 cover body 801 and the sealing plastic plate 802 is not specifically limited.

[0076] Specifically, the sealing plastic plate 802, the plastic part 4, and the end plate 3 can be made of PP material.

[0077] In one embodiment, as Figure 4 shown, a plurality of exhaust holes 8021 are provided on the sealing plastic plate 802, and the plurality of exhaust holes 8021 are arranged at intervals.

[0078] By providing a plurality of exhaust holes 8021 on the sealing plastic plate 802, the exhaust holes 8021 can help release gas when the internal pressure of the battery cell is too high, prevent the accumulation of internal pressure, thereby improving the safety of the battery cell, contributing to improving the stability of the overall structure, and reducing deformation or damage caused by internal pressure changes during use.

[0079] Specifically, the exhaust hole 8021 can be set in any existing shape such as a circular hole or a square hole. In the embodiments of the present application, the shape and number of the exhaust holes 8021 are not specifically limited.

[0080] In one embodiment, as Figure 4 shown, the area of the sealing plastic plate 802 is adapted to the bottom surface area of the cover body 801.

[0081] The adaptation of the sealing plastic plate 802 to the bottom surface of the cover body 801 can ensure good sealing performance, prevent electrolyte leakage, improve the sealing of the battery cell, and at the same time avoid the short circuit of the battery cell caused by the direct contact between the tab 201 and the cover body 801.

[0082] In one embodiment, as Figure 4 shown, it further includes an explosion-proof valve 8011, and the explosion-proof valve 8011 is arranged on the cover body 801.

[0083] By arranging the explosion-proof valve 8011 on the cover body 801, it can be automatically opened when the internal pressure of the battery cell is too high to release the internal pressure, prevent the battery cell from exploding or being damaged, and improve the overall safety of the product. Since the production cost of the cover body 801 is relatively low, if the explosion-proof valve 8011 and the cover body 801 are damaged during the welding process, only the cover body 801 needs to be replaced, reducing the overall manufacturing cost caused by the damage.

[0084] The installation process of the battery cell in this embodiment is described as follows:

[0085] First, the electrode group 2 is coated with an insulating sheet 9 on the surface and is inserted into the accommodating cavity from the opening of the housing 1. Then, the welding bottom plate 6 is arranged at the bottom of the cover plate 5, and a plastic part 4 is arranged between the welding bottom plate 6 and the cover plate 5 to ensure insulation between the welding bottom plate 6 and the cover plate 5 through the plastic part 4.

[0086] The end plate 3 is arranged on the electrode group 2 and the tab 201 passes through the through hole 301 of the end plate 3, so that the electrode group 2 is insulated from the welding bottom plate 6 through the end plate 3. Subsequently, the cover plate 5 is covered on the opening of the housing 1. The position of the through hole 501 on the cover plate 5 corresponds to the position of the tab 201, and the tab 201 passes through the through hole 301 of the plastic part 4 and exits from the through hole 501.

[0087] The tab 201 is bent into an "L" shape so that the bottom surface of the tab 201 contacts the top surface of the welding bottom plate 6, and the installer can perform welding fixation on the welding bottom plate 6 and the tab 201 through the through hole 501.

[0088] After the welding of the welding bottom plate 6 and the tab 201 is completed, the electrolyte can be injected into the battery cell through the through hole 501. When the liquid injection is completed, the sealing cover 8 is covered at the through hole 501 to seal the accommodating cavity, completing the assembly of the battery cell.

[0089] According to an embodiment of the present utility model, on the other hand, a battery pack is further provided, which includes a plurality of battery cells.

[0090] Specifically, the plurality of battery cells are connected in series and / or in parallel to form a plurality of battery cell modules, and the plurality of battery cell modules are assembled into a battery pack.

[0091] This battery pack includes the battery cells as described above, and thus has all the beneficial technical effects of the battery cells, which will not be elaborated here.

[0092] Although the embodiments of the present utility model are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing, provided with a receiving cavity and an opening communicating with the receiving cavity; A pole group, arranged in the receiving cavity and having pole tabs at the ends of the pole group; A cover plate, covering the opening, and through holes are provided in the cover plate at positions corresponding to the pole tabs; A welding bottom plate, arranged at the bottom of the cover plate, with an end plate provided between the welding bottom plate and the pole group, a plastic part provided between the welding bottom plate and the cover plate, through holes for the pole tabs to pass through are provided in both the end plate and the plastic part, the welding bottom plate extends to the through holes and abuts against the pole tabs, and the welding bottom plate and the pole tabs are fixedly connected by welding; A sealing cover, covering the through holes and sealing the receiving cavity.

2. The battery cell according to claim 1, wherein, The pole tab is bent, and the bent section of the pole tab is arranged between the welding bottom plate and the cover plate, and the bottom surface of the bent section abuts against the top surface of the welding bottom plate.

3. The battery cell according to claim 2, wherein, The pole tab is bent in an "L" shape.

4. The battery cell according to claim 1, characterized in that, An installation part is provided on the outer surface of the cover plate around the through hole, the installation part protrudes from the outer surface of the cover plate, and the sealing cover covers the installation part.

5. The cell according to claim 4, wherein A stepped groove is provided on the inner side of the installation part, a stepped surface corresponding to the stepped groove is provided around the sealing cover, and the sealing cover and the installation part are hermetically connected through the cooperation of the stepped groove and the stepped surface.

6. The battery cell according to any one of claims 1 to 5, characterized in that The sealing cover includes a cover body and a sealing plastic plate, and the sealing plastic plate is arranged on one side of the cover body and is located between the pole tab and the cover body.

7. The battery cell according to claim 6, wherein A plurality of exhaust holes are spaced apart on the sealing plastic plate.

8. The battery cell according to claim 6, wherein The area of the sealing plastic plate is adapted to the bottom surface area of the cover body.

9. The battery cell according to claim 7, wherein, An explosion-proof valve is further included, and the explosion-proof valve is arranged on the cover body.

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

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