Battery cell cover plate assembly and battery cell, battery pack, and electric device

Abstract

The utility model discloses a kind of cover plate assembly of battery monomer and battery monomer, battery pack, electric equipment, the cover plate assembly of battery monomer includes: cover plate, cover plate is equipped with through hole;Insulating part, insulating part is fixed in the first side of cover plate, insulating part defines and recesses first recess towards the direction of departing from first side, the bottom wall of first recess is equipped with the first vent of intercommunication with through hole, pole, pole is supported in first recess and is equipped with in first vent and through hole, pole is adapted to with the polar lug electrical connection of pole core.According to the cover plate assembly of battery monomer of the utility model embodiment, by setting first recess on insulating part, make pole support in first recess, can reduce the overall height of insulating part and pole, reduce the space occupied by insulating part and pole in battery monomer, and then it is convenient to reserve larger space for the setting of pole core, to increase the energy density of electric core, improve the capacity of battery monomer.

Description

Technical Field

[0001] This utility model relates to the field of battery cell technology, specifically to a cover plate assembly for a battery cell, a battery cell, a battery pack, and electrical equipment. Background Technology

[0002] In traditional batteries, the electrode core is the core component, responsible for the storage and release of electrochemical energy. The larger the electrode core, the larger the battery capacity. How to increase battery capacity while maintaining battery size has become a major challenge. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a cover plate assembly for a battery cell. By providing a first recess on the insulating component, the cover plate assembly allows the electrode post to be supported in the first recess, thereby reducing the overall height of the insulating component and the electrode post, reducing the space occupied by the insulating component and the electrode post in the battery cell, and thus making it easier to reserve more space for the electrode core, thereby increasing the energy density of the cell and improving the capacity of the battery cell.

[0004] This utility model also proposes a battery cell having the aforementioned cover assembly.

[0005] This utility model also proposes a battery pack having the aforementioned battery cells.

[0006] This utility model also proposes an electrical device having the aforementioned battery cell or battery pack.

[0007] A cover plate assembly for a battery cell according to a first aspect of the present invention includes: a cover plate having a through hole; an insulating member fixed to a first side of the cover plate, the insulating member defining a first recess recessed in a direction away from the first side, the bottom wall of the first recess having a first opening communicating with the through hole; and a pole post supported in the first recess and passing through the first opening and the through hole, the pole post being adapted to be electrically connected to the tab of the electrode core.

[0008] According to the battery cell cover assembly of the present invention, by providing a first recess on the insulating member and supporting the electrode post in the first recess, the overall height of the insulating member and the electrode post can be reduced, the space occupied by the insulating member and the electrode post in the battery cell can be reduced, and thus more space can be reserved for the setting of the electrode core, so as to increase the energy density of the cell and improve the capacity of the battery cell.

[0009] In addition, the cover plate assembly of the battery cell according to the above embodiments of the present invention may also have the following additional technical features:

[0010] According to some embodiments of the present invention, the pole post is fixedly connected to the bottom wall of the first recess.

[0011] According to some embodiments of the present invention, the pole post does not extend beyond the first recess.

[0012] According to some embodiments of the present invention, the cover plate assembly further includes a buffer member disposed between the insulating member and the cover plate, and the buffer member is deformable.

[0013] According to some optional embodiments of the present invention, the buffer is arranged around the through hole.

[0014] According to some specific embodiments of the present invention, the buffer includes a first annular fixing part and a second annular fixing part, the first annular fixing part being arranged around the through hole; the second annular fixing part protruding from the axial sidewall of the first annular fixing part, the outer diameter of the second annular fixing part being smaller than the outer diameter of the first annular fixing part; the insulating member being fixed to the side of the second annular fixing part opposite to the first annular fixing part.

[0015] According to some specific embodiments of this utility model, the buffer is an integrally formed metal part.

[0016] According to some optional embodiments of the present invention, the first side of the cover plate has a second recess that is recessed away from the first side, the through hole penetrates the bottom wall of the second recess, and the buffer is fixed to the bottom wall of the second recess.

[0017] According to some specific embodiments of the present invention, the buffer member is fixedly connected to the bottom wall of the second recess.

[0018] According to some embodiments of the present invention, the cover plate assembly further includes: an isolation member, the isolation member being an insulating member and the isolation member being located on the second side of the cover plate, the first side and the second side being disposed opposite to each other, and the isolation member having a clearance hole corresponding to the through hole.

[0019] According to some optional embodiments of the present invention, the cover plate assembly further includes: a sealing element adapted to be fitted over the pole post, the sealing element being sandwiched between the insulating element and the isolating element.

[0020] According to some embodiments of the present invention, the pole post includes: a first part defining a chamber, the opening of the chamber facing away from the cover plate; and a second part located within the chamber, the first part being made of a different material from the second part, the first part being adapted to be welded to the tab of the pole core.

[0021] According to a second aspect of the present invention, a battery cell is provided, the battery cell comprising: a housing defining a receiving cavity having an open end; an electrode core disposed within the receiving cavity; and a cover plate assembly of the battery cell according to a first aspect of the present invention, the cover plate assembly covering the open end.

[0022] According to the embodiments of the present invention, by utilizing the cover plate assembly of the battery cell described in the first aspect of the present invention, and by providing a first recess on the insulating member, the electrode post is supported in the first recess, which can reduce the overall height of the insulating member and the electrode post, reduce the space occupied by the insulating member and the electrode post in the battery cell, and thus facilitate the reservation of more space for the setting of the electrode core, so as to increase the energy density of the cell and improve the capacity of the battery cell.

[0023] According to some embodiments of the present invention, the battery cell includes two cover plate assemblies, and both ends of the receiving cavity have open openings, with the cover plate assembly covering the corresponding open openings.

[0024] A battery pack is provided according to a third aspect of the present invention, the battery pack comprising the battery cells described in the second aspect of the present invention.

[0025] According to the battery pack of the present invention, by utilizing the battery cell described in the second aspect of the present invention, by providing a first recess on the insulating member and supporting the electrode post in the first recess, the overall height of the insulating member and the electrode post can be reduced, the space occupied by the insulating member and the electrode post in the battery cell can be reduced, and thus more space can be reserved for the setting of the electrode core, so as to increase the energy density of the cell and improve the capacity of the battery cell.

[0026] According to a fourth aspect of the present invention, an electrical device is provided, the electrical device comprising a battery cell according to a second aspect of the present invention or a battery pack according to a third aspect of the present invention.

[0027] According to an embodiment of the present invention, an electrical device utilizes a battery cell according to an embodiment of the second aspect of the present invention or a battery pack according to an embodiment of the third aspect of the present invention. By providing a first recess on the insulating member and supporting the electrode post in the first recess, the overall height of the insulating member and the electrode post can be reduced, the space occupied by the insulating member and the electrode post in the battery cell can be reduced, and thus more space can be reserved for the setting of the electrode core, so as to increase the energy density of the cell and improve the capacity of the battery cell.

[0028] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0030] Figure 1 This is a top view of the cover plate assembly according to an embodiment of the present utility model;

[0031] Figure 2 yes Figure 1 Sectional view at point AA;

[0032] Figure 3 yes Figure 2 Enlarged view of the central area;

[0033] Figure 4 This is a schematic diagram of the structure of the insulating component according to an embodiment of the present utility model;

[0034] Figure 5 This is an exploded view of the cover plate assembly according to an embodiment of the present utility model. The pole includes a first part and a second part.

[0035] Figure 6 This is an exploded view of the cover plate assembly according to an embodiment of the present utility model;

[0036] Figure 7 This is an exploded view of the structure of a battery cell according to an embodiment of the present invention.

[0037] Reference numerals: 1000, battery cell; 1, cover plate assembly;

[0038] 10. Cover plate; 11. Through hole; 12. Second recess;

[0039] 20. Insulating component; 21. First recess; 22. First opening;

[0040] 30. Pole post; 31. First part; 311. Chamber; 32. Second part; 33. Overall part; 34. Protrusion;

[0041] 40. Buffer component; 41. First annular fixing part; 42. Second annular fixing part; 43. Second opening;

[0042] 50. Isolation component; 51. Clearance hole;

[0043] 60. Sealing components;

[0044] 8. Shell; 81. Opening; 9. Core. Detailed Implementation

[0045] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0046] The cover plate assembly 1 of the battery cell 1000 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0047] like Figures 1-4 As shown, the cover plate assembly 1 of the battery cell 1000 according to an embodiment of the present invention includes a cover plate 10, an insulating member 20, and a terminal post 30.

[0048] The cover plate 10 is provided with a through hole 11. An insulating member 20 is fixed to the first side of the cover plate 10. The insulating member 20 defines a first recess 21 that is recessed in the direction away from the first side. The bottom wall of the first recess 21 is provided with a first opening 22 that communicates with the through hole 11. The pole post 30 is supported in the first recess 21. The pole post 30 passes through the first opening 22 and the through hole 11. The pole post 30 is suitable for electrical connection with the tab of the pole core 9.

[0049] Specifically, the insulating component 20 is used to separate the cover plate 10 and the terminal post 30 to prevent the terminal post 30 and the cover plate 10 from being electrically connected, thereby preventing the battery cell 1000 from short-circuiting. The terminal post 30 extends into the battery cell 1000 through the first opening 22 and the through hole 11 to be electrically connected to the tab of the electrode core 9 inside the battery cell 1000. The terminal post 30 is then used to conduct the current inside the battery cell 1000 to an external device, or to introduce the external charging current into the battery cell 1000, thereby realizing the charging and discharging of the battery cell 1000.

[0050] By providing a first recess 21 on the insulating member 20, the pole post 30 is supported in the first recess 21. This allows the space within the insulating member 20 to provide space for the position of the pole post 30, thereby reducing the overall height of the insulating member 20 and the pole post 30.

[0051] Specifically, the battery cell 1000 includes a casing, a cover plate 10 defining a side wall of the casing, a first side of the cover plate 10 being the outer side of the casing, an insulator 20 fixed to the first side of the cover plate 10, the insulator 20 being located on the outer side of the casing, and a fixed length of the terminal post 30 extending into the casing to achieve electrical connection between the terminal post 30 and the tab. By reducing the overall height of the insulator 20 and the terminal post 30, the length of the portion of the insulator 20 and the terminal post 30 located on the outer side of the casing can be reduced.

[0052] The outer casing has a positive terminal 30 and a negative terminal 30 at opposite ends. The protruding ends of both the positive and negative terminals 30 are exposed outside the casing for electrical connection with external devices. This allows the current inside the battery cell 1000 to be conducted to the external device or the external charging current to be introduced into the battery cell 1000, thereby enabling the charging and discharging of the battery cell 1000.

[0053] The positive terminal 30 and negative terminal 30 of the battery cell 1000 are respectively located at the first end and the second end of the outer casing, which are opposite to each other. For battery cells 1000 of the same model, the distance between the protruding end of the positive terminal 30 and the protruding end of the negative terminal 30 is the same. That is to say, when the overall length of the battery cell 1000 remains unchanged, by providing the first recess 21 on the insulating member 20, the length of the terminal 30 protruding from the insulating member 20 is reduced, and the height of the insulating member 20 and the terminal 30 located on the outer side of the outer casing is reduced. This makes it possible to increase the length between the first end and the second section of the outer casing, thereby reserving more space for the setting of the electrode core 9, so as to increase the energy density of the cell and improve the capacity of the battery cell 1000.

[0054] According to the embodiment of the present invention, the cover plate assembly 1 of the battery cell 1000, by providing a first recess 21 on the insulating member 20, allows the electrode post 30 to be supported on the first recess 21, thereby reducing the overall height of the insulating member 20 and the electrode post 30, reducing the space occupied by the insulating member 20 and the electrode post 30 in the battery cell 1000, and thus making it easier to reserve more space for the setting of the electrode core 9, so as to increase the energy density of the cell and improve the capacity of the battery cell 1000.

[0055] The cover plate assembly 1 of the battery cell 1000 according to a specific embodiment of the present invention is described below with reference to the accompanying drawings.

[0056] In some specific embodiments of this utility model, such as Figures 1-4 As shown, the cover plate assembly 1 includes a cover plate 10, an insulating element 20, and a pole post 30.

[0057] In some embodiments of this utility model, the electrode post 30 is fixedly connected to the bottom wall of the first recess 21 to fix the electrode post 30 and the insulating member 20 together, so that the insulating member 20 can fully separate the electrode post 30 and the cover plate 10, avoid the electrode post 30 and the cover plate 10 from contacting each other, and thus reduce the possibility of short circuit of the battery cell 1000.

[0058] In some embodiments, the insulating element 20 is a ceramic element, which has high temperature resistance and corrosion resistance, resulting in good insulation performance and high reliability of the insulating element 20.

[0059] In some examples, the pole post 30 is brazed to the bottom wall of the first recess 21, resulting in high fixation strength between the insulating member 20 and the pole post 30.

[0060] In some embodiments of this utility model, such as Figure 3 As shown, the pole post 30 includes an integral part 33 and a protruding part 34. The protruding part 34 protrudes from the integral part 33. The integral part 33 extends into the battery cell 1000 through the first opening 22 and the through hole 11 for electrical connection with the pole core 9 inside the battery cell 1000. The protruding part 34 is supported on the bottom of the first recess 21 for fixed connection with the insulating member 20.

[0061] In some embodiments of this utility model, such as Figure 2 , Figure 3 As shown, the pole post 30 does not extend beyond the first recess 21, which facilitates the control of the overall height of the pole post 30 and the insulating component 20 by controlling the height of the insulating component 20, thereby facilitating the subsequent control of the overall length of the battery cell 1000.

[0062] In some examples, such as Figure 3 As shown, the axis of the first opening 22 extends along the first direction. The pole post 30 not exceeding the first recess 21 means that, in the first direction, the portion of the pole post 30 located within the first recess 21 on the side facing away from the cover plate 10 does not exceed the end of the insulating member 20 on the side facing away from the cover plate 10. This allows for control over the overall length of the insulating member 20 and the pole post 30 extending beyond the cover plate 10, preventing the insulating member 20 and the pole post 30 from exceeding the cover plate 10 by an excessive amount, thus avoiding the insulating member 20 and the pole post 30 occupying too much space in the battery cell 1000, reserving more space for the electrode core 9, thereby increasing the energy density and capacity of the battery cell 1000.

[0063] In some embodiments of this utility model, such as Figure 3 , Figure 5 As shown, the cover plate assembly 1 also includes a buffer 40, which is disposed between the insulating member 20 and the cover plate 10. The buffer 40 is deformable. When the cover plate 10 is deformed, such as during thermal expansion and contraction or when the insulating member 20 is assembled onto the cover plate 10, the buffer 40 can absorb the stress between the cover plate 10 and the insulating member 20 to reduce the force directly transmitted to the insulating member 20 and reduce the possibility of the insulating member 20 being damaged due to stress.

[0064] In some embodiments, the insulating component 20 is a ceramic component. If the ceramic component is directly brazed onto the cover plate 10, the cover plate 10 will not be able to shrink back to its original length after brazing, and inward stress will be applied to the ceramic component at the brazing location, which may cause the ceramic component to break. In this embodiment, by providing a buffer component 40 between the ceramic component and the cover plate 10, the deformable nature of the buffer component 40 can alleviate assembly stress, thermal stress, or mechanical stress during charging and discharging, and prevent the force from acting directly on the ceramic component, thereby reducing the possibility of the ceramic component cracking.

[0065] In some optional embodiments of this utility model, such as Figure 3 , Figure 5 As shown, the buffer 40 is arranged around the through hole 11 to increase the mating area between the buffer 40 and the insulating member 20, thereby improving the fixing strength between the buffer 40 and the insulating member 20.

[0066] Specifically, the buffer 40 defines a second opening 43, which is opposite to and connected to the through hole 11. The electrode post 30 passes through the first opening 22, the second opening 43 and the through hole 11 and is electrically connected to the tab of the electrode core 9 inside the battery cell 1000.

[0067] In some examples, such as Figure 3 As shown, the buffer 40 is a ring-shaped part, the insulating part 20 is a ring-shaped part, the buffer 40 is a metal part, the insulating part 20 is a ceramic part, the insulating part 20 is supported on the buffer 40, and the two are fixedly connected by brazing.

[0068] In some specific embodiments of this utility model, such as Figure 5 As shown, the buffer 40 includes a first annular fixing part 41 and a second annular fixing part 42. The first annular fixing part 41 is arranged around the through hole 11, and the second annular fixing part 42 protrudes from the axial sidewall of the first annular fixing part 41. The outer diameter of the second annular fixing part 42 is smaller than the outer diameter of the first annular fixing part 41. The insulating part 20 is fixed to the side of the second annular fixing part 42 opposite to the first annular fixing part 41.

[0069] Specifically, the first annular fixing part 41 is adapted to be fixed on the cover plate 10, and the insulating member 20 is fixed on the second annular fixing part 42, so as to fully separate the cover plate 10 and the insulating member 20 by using the buffer member 40, reduce the force transmitted from the cover plate 10 to the insulating member 20 by the buffer member 40, and eliminate the stress on the insulating member 20.

[0070] In some specific embodiments of this utility model, the buffer 40 is an integrally formed metal part, so that the buffer 40 has a certain strength, so that the buffer 40 can eliminate the stress on the insulating part 20 and avoid the insulating part 20 from cracking, etc.

[0071] In some embodiments, the first annular fixing part 41 is welded and fixed to the cover plate 10, the insulating part 20 is a ceramic part, and the insulating part 20 is brazed and fixed to the second annular fixing part 42. This makes the structure of the buffer 40 simple, while giving the buffer 40 the ability to eliminate stress on the insulating part 20.

[0072] In some optional embodiments of this utility model, such as Figure 3 , Figure 5 As shown, the first side of the cover plate 10 has a second recess 12 that is recessed away from the first side, the through hole 11 penetrates the bottom wall of the second recess 12, and the buffer member 40 is fixed to the bottom wall of the second recess 12.

[0073] By providing a second recess 12, space is reserved for the buffer member 40, which facilitates reducing the overall height of the cover plate 10 and the buffer member 40. The insulating member 20 is fixed on the buffer member 40, which reduces the height of the insulating member 20 and the terminal post 30 beyond the cover plate 10, thereby further reducing the space occupied by the insulating member 20 and the terminal post 30 in the battery cell 1000, so as to reserve more space for the electrode core 9.

[0074] In some specific embodiments of this utility model, the buffer member 40 is fixedly connected to the bottom wall of the second recess 12 to fix the buffer part on the cover plate 10, and at the same time the buffer part is arranged around the through hole 11.

[0075] In some embodiments of this utility model, such as Figure 5 As shown, the cover plate assembly 1 also includes a separator 50, which is an insulating member 20. The separator 50 is located on the second side of the cover plate 10, with the first side and the second side being arranged opposite to each other. The insulating member 20 is used to separate the tabs and the cover plate 10 to prevent the tabs and the cover plate 10 from making contact and connecting, thereby preventing the battery cell 1000 from short-circuiting.

[0076] The separator 50 is provided with a clearance hole 51 corresponding to the through hole 11. The pole post 30 is adapted to be electrically connected to the tab of the inner pole core 9 of the battery cell 1000 through the first through hole 22, the through hole 11 and the clearance hole 51.

[0077] In some examples, the buffer 40 defines a second opening 43, through which the electrode post 30 passes through the first opening 22, the second opening 43, the through hole 11, and the clearance hole 51 and is electrically connected to the tab of the electrode core 9 inside the battery cell 1000.

[0078] In some optional embodiments of this utility model, such as Figure 3 , Figure 5As shown, the cover plate assembly 1 also includes a sealing element 60, which is adapted to be sleeved on the terminal post 30. The sealing element 60 is sandwiched between the insulating element 20 and the separator 50 to seal the gap between the insulating element 20 and the separator 50, thereby preventing the electrolyte in the battery cell 1000 from flowing to the through hole 11 through the gap between the insulating element 20 and the separator 50, and preventing electrolyte leakage from the battery cell 1000.

[0079] In some examples, such as Figure 3 As shown, the pole post 30 includes an integral part 33 and a protruding part 34. The protruding part 34 protrudes from the integral part 33. The integral part 33 extends into the battery cell 1000 through the first opening 22 and the through hole 11 for electrical connection with the pole core 9 inside the battery cell 1000. The protruding part 34 is supported on the bottom of the first recess 21 for fixed connection with the insulating member 20.

[0080] The sealing element 60 is fitted over the protrusion 34. The protrusion 34 and the sealing element 60 are together inserted through the second opening 43 and the through hole 11 in the middle of the buffer 40. The sealing element 60 is sandwiched between the insulating element 20 and the isolating element 50 to seal the gap between the insulating element 20 and the isolating element 50, so as to prevent the electrolyte in the battery cell 1000 from flowing to the through hole 11 through the gap between the insulating element 20 and the isolating element 50, and to prevent the electrolyte of the battery cell 1000 from leaking.

[0081] In some embodiments of this utility model, such as Figure 3 , Figure 5 As shown, the pole post 30 includes a first part 31 and a second part 32. The first part 31 defines a chamber 311, the opening of which faces away from the cover plate 10. The second part 32 is located inside the chamber 311. The materials of the first part 31 and the second part 32 are different. The first part 31 is suitable for welding to the tab of the pole core 9.

[0082] By using different materials for the first part 31 and the second part 32, it is easier to reduce costs and save resources when the material cost of the first part 31 or the second part 32 is higher.

[0083] In some embodiments, the first part 31 is made of copper and the second part 32 is made of aluminum. The first part 31 is adapted to be welded to the negative electrode tab of the electrode core 9 so that the first part 31 and the negative electrode tab are made of the same material, thereby facilitating the welding and fixing of the electrode post 30 and the negative electrode tab together.

[0084] Due to the high cost of copper, the pole post 30 is divided into a first part 31 and a second part 32 to reduce copper consumption and thus save costs.

[0085] In some embodiments, the second portion 32 is interference-fitted with the chamber 311 to secure the second portion 32 within the chamber 311.

[0086] Furthermore, the first part 31 and the second part 32 are spot welded together.

[0087] In some embodiments of this utility model, such as Figure 6 As shown, the pole post 30 is an integrally formed aluminum pole post 30. The pole post 30 is suitable for electrical connection of the positive electrode tab of the pole core 9 so that the material of the pole post 30 is the same as that of the positive electrode tab, which facilitates welding and fixing the pole post 30 and the positive electrode tab together.

[0088] The following describes a battery cell 1000 according to an embodiment of the present invention. Figure 7 As shown, the battery cell 1000 according to an embodiment of the present invention includes a housing 8, an electrode core 9, and a cover plate assembly 1 according to the above embodiment of the present invention.

[0089] The housing 8 defines a receiving cavity, the end of which has an opening 81. The pole core 9 is disposed in the receiving cavity, and the cover plate assembly 1 is disposed on the opening 81 to close the opening 81.

[0090] The electrode post 30 on the cover plate assembly 1 is adapted to be electrically connected to the electrode tab of the electrode core 9 so as to conduct the current inside the battery cell 1000 to an external device or to introduce the external charging current into the battery cell 1000, thereby realizing the charging and discharging of the battery cell 1000.

[0091] According to the battery cell 1000 of the present invention, by utilizing the cover plate assembly 1 of the battery cell 1000 of the above embodiment of the present invention, by providing a first recess 21 on the insulating member 20, the electrode post 30 is supported on the first recess 21, which can reduce the overall height of the insulating member 20 and the electrode post 30, reduce the space occupied by the insulating member 20 and the electrode post 30 in the battery cell 1000, and thus make it easier to reserve more space for the setting of the electrode core 9, so as to increase the energy density of the cell and improve the capacity of the battery cell 1000.

[0092] In some embodiments of this utility model, such as Figure 7 As shown, the battery cell 1000 includes two cover assemblies 1, each with an opening 81 at both ends of the receiving cavity. The cover assembly 1 covers the corresponding opening 81 to close the two openings 81.

[0093] Specifically, the two cover plate assemblies 1 include two poles 30, one of which is a positive pole 30 and the other is a negative pole 30. The positive pole 30 is adapted to be electrically connected to the positive tab of the pole core 9, and the negative pole 30 is adapted to be electrically connected to the negative tab of the pole core 9.

[0094] In some embodiments, such as Figure 5 As shown, the negative electrode post 30 includes a first part 31 and a second part 32. The first part 31 is made of copper, and the second part 32 is made of aluminum. The first part 31 is suitable for welding to the negative electrode tab of the electrode core 9 so that the first part 31 and the negative electrode tab are made of the same material, thereby facilitating the welding and fixing of the negative electrode post 30 and the negative electrode tab together.

[0095] In some embodiments, such as Figure 6 As shown, the positive electrode post 30 is made of aluminum so that the positive electrode post 30 and the positive electrode tab are made of the same material, which makes it easier to weld the positive electrode post 30 and the positive electrode tab together.

[0096] Other configurations and operations of the battery cell 1000 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0097] The following describes a battery pack according to an embodiment of the present invention. The battery pack according to an embodiment of the present invention includes a battery cell 1000 according to the above embodiment of the present invention.

[0098] According to the battery pack of the present invention, by utilizing the battery cell 1000 of the above embodiment of the present invention, by providing a first recess 21 on the insulating member 20, the pole post 30 is supported on the first recess 21, which can reduce the overall height of the insulating member 20 and the pole post 30, reduce the space occupied by the insulating member 20 and the pole post 30 in the battery cell 1000, and thus make it easier to reserve more space for the setting of the pole core 9, so as to increase the energy density of the cell and improve the capacity of the battery cell 1000.

[0099] Other configurations and operations of the battery pack according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0100] The following describes an electrical device according to an embodiment of the present invention. The electrical device according to an embodiment of the present invention includes a battery cell 1000 or a battery pack according to the above embodiments of the present invention.

[0101] Among them, electrical equipment can include, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc.

[0102] Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; spacecraft can include airplanes, rockets, space shuttles, and spacecraft; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0103] In some embodiments, the electrical device is a vehicle, which may be a pure electric vehicle or a hybrid vehicle.

[0104] According to the embodiments of the present invention, the electrical equipment utilizes the cover plate assembly 1 of the battery cell 1000 according to the above embodiments of the present invention. By providing a first recess 21 on the insulating member 20, the pole post 30 is supported on the first recess 21. This reduces the overall height of the insulating member 20 and the pole post 30, decreases the space occupied by the insulating member 20 and the pole post 30 in the battery cell 1000, and facilitates the provision of more space for the setting of the pole core 9, thereby increasing the energy density of the cell and improving the capacity of the battery cell 1000.

[0105] Other components and operations of the electrical equipment according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0106] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, "above" or "below" a second feature may include direct contact between the first and second features, or it may include contact between the first and second features not being in direct contact but through another feature between them.

[0107] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0108] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0109] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0110] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cover plate assembly for a battery cell, characterized in that, The battery cell (1000) includes an electrode core (9), and the cover plate assembly includes: Cover plate (10), the cover plate (10) is provided with through hole (11); An insulating member (20) is fixed to a first side of the cover plate (10). The insulating member (20) defines a first recess (21) that is recessed in a direction away from the first side. The bottom wall of the first recess (21) is provided with a first opening (22) that communicates with the through hole (11). The pole post (30) is supported in the first recess (21) and passes through the first opening (22) and the through hole (11). The pole post (30) is adapted to be electrically connected to the tab of the pole core (9).

2. The cover plate assembly for a battery cell according to claim 1, characterized in that, The pole post (30) is fixedly connected to the bottom wall of the first recess (21).

3. The cover plate assembly for a battery cell according to claim 1, characterized in that, The pole post (30) does not extend beyond the first recess (21).

4. The cover plate assembly for a battery cell according to claim 1, characterized in that, Also includes: A buffer (40) is disposed between the insulating member (20) and the cover plate (10), and the buffer (40) is deformable.

5. The cover plate assembly for a battery cell according to claim 4, characterized in that, The buffer (40) is arranged around the through hole (11).

6. The cover plate assembly for a battery cell according to claim 5, characterized in that, The buffer (40) includes a first annular fixing part (41) and a second annular fixing part (42), wherein the first annular fixing part (41) is arranged around the through hole (11); The second annular fixing part (42) protrudes from the axial sidewall of the first annular fixing part (41), and the outer diameter of the second annular fixing part (42) is smaller than the outer diameter of the first annular fixing part (41). The insulating member (20) is fixed to the side of the second annular fixing part (42) opposite to the first annular fixing part (41).

7. The cover plate assembly for a battery cell according to claim 6, characterized in that, The buffer (40) is a metal part formed in one piece.

8. The cover plate assembly for a battery cell according to claim 4, characterized in that, The cover plate (10) has a second recess (12) on its first side that is recessed away from the first side. The through hole (11) penetrates the bottom wall of the second recess (12). The buffer (40) is fixed to the bottom wall of the second recess (12).

9. The cover plate assembly for a battery cell according to claim 8, characterized in that, The buffer (40) is fixedly connected to the bottom wall of the second recess (12).

10. The cover plate assembly for a battery cell according to claim 1, characterized in that, Also includes: The isolation member (50) is an insulating member (20) and the isolation member (50) is located on the second side of the cover plate (10). The first side and the second side are arranged opposite to each other. The isolation member (50) is provided with a clearance hole (51) corresponding to the through hole (11).

11. The cover plate assembly for a battery cell according to claim 10, characterized in that, Also includes: A sealing element (60) adapted to be fitted over the pole post (30), the sealing element (60) being sandwiched between the insulating element (20) and the isolating element (50).

12. The cover plate assembly for a battery cell according to claim 1, characterized in that, The pole (30) includes: A first part (31) defines a chamber (311) with its opening facing away from the cover plate (10); The second part (32) is located in the chamber (311). The material of the first part (31) is different from that of the second part (32). The first part (31) is suitable for welding to the tab of the pole core (9).

13. A single battery cell (1000), characterized in that, include: A housing (8) defining a receiving cavity, the end of which has an opening (81); The electrode core (9) is disposed within the receiving cavity; A cover assembly, wherein the cover assembly is any one of claims 1-12, the cover assembly being disposed over the opening (81).

14. The battery cell (1000) according to claim 13, characterized in that, The accommodating cavity includes two cover assemblies, each having an opening (81) at both ends, with the cover assembly covering the corresponding opening (81).

15. A battery pack, characterized in that, Includes the battery cell (1000) as described in claim 13 or 14.

16. An electrical appliance, characterized in that, It includes the battery cell (1000) as described in claim 13 or 14, or the battery pack as described in claim 15.

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