Battery cover plate, battery encapsulating member and battery

Abstract

A battery cover plate, a battery encapsulating member and a battery. The battery cover plate comprises a first cover plate (1) and a terminal post block (2), wherein the terminal post block (2) is connected to the first cover plate (1). The terminal post block (2) comprises a second cover plate (21), an insulating layer and terminal posts (25), wherein the insulating layer and the second cover plate (21) are stacked; first through holes (211) are provided in the second cover plate (21); the terminal posts (25) are inserted into the first through holes (211); and the insulating layer isolates the terminal posts (25) from the second cover plate (21). The cover plate has a simple structure, few structural members, a simple manufacturing process and relatively low manufacturing costs. By means of splitting a conventional cover plate structure into the first cover plate (1) and the terminal post block (2), when tabs (6) are welded to connecting sheets of the terminal posts (25), the tabs (6) need to extend out by a smaller length, that is, the overall length of the tabs (6) is smaller, and spaces needing to be reserved inside battery cells (5) for bending the tabs (6) are smaller, such that the volume of a jelly roll inside each battery cell (5) can be increased, the battery cells (5) have higher internal-space utilization rates, and the volumetric energy density is improved by 0.5%-5%.

Description

Battery cover, battery package and battery

[0001] This application is based on the Chinese invention application with application number 202410128199.X filed on January 30, 2024, entitled “A battery cover, battery package and battery”, and claims priority. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery cover, a battery package and a battery. Background Art

[0003] The design of the internal structure of the battery cell is the key to the design of the battery cell. It is necessary to ensure the internal insulation and safety as well as the energy density of the battery cell. The traditional battery cell design has many internal structural parts, occupies a large space, has a relatively high manufacturing cost, and the energy density improvement is also limited to a certain extent; in particular, the existing battery installation usually requires the battery cell to be placed in the shell, the battery cell's tabs are welded to the cover plate, and then the cover plate and the shell are welded together. Based on the actual welding operation needs, the cover plate and the shell need to be flipped at a certain angle to expose the welding surface, and then the tabs are welded, and then the cover plate is flipped again to cover the opening of the shell and welded together. This structure requires a longer length of tabs to facilitate the flipping space requirements of the cover plate. The longer the tabs are, the higher the risk of short circuits. At the same time, the shell needs to be set More tab space is reserved, resulting in a decrease in energy density. On the other hand, when installing a battery housing structure that requires a cover plate at both ends for sealing, a larger tab space is required at both ends of the battery housing, which is usually larger than the actual space required for the tab to fold. This is because when the cover plate at one end is welded, the folded tab can easily cause the battery cell inside the battery housing to shift through force transmission, thereby affecting the alignment of the cover plate and the tab at the other end. Therefore, a larger tab space is required to avoid the problem of cell displacement caused by the sealing welding process of the cover plate at one end, but this arrangement also leads to a decrease in battery energy density. Therefore, how to overcome the above-mentioned technical problems and defects has become a key issue that needs to be solved. Summary of the Invention

[0004] In response to the problems that existing battery cells have many internal structural parts, occupy a large space, have relatively high manufacturing costs, and have low energy density, the present application provides a battery cover, a battery package, and a battery.

[0005] The technical solutions adopted by this application to solve the above technical problems are as follows:

[0006] On the one hand, the present application provides a battery cover, which is used to enclose a battery shell to form a battery. The battery cover includes a first cover and a pole block. The first cover is provided with a mounting hole, and the pole block is arranged in the mounting hole and connected to the first cover; the pole block includes a second cover, an insulating layer and a pole, the insulating layer and the second cover are stacked, the second cover is provided with a first through hole, the pole is arranged in the first through hole, and the insulating layer is used to isolate the pole from the second cover.

[0007] Optionally, the second cover plate is provided with a plurality of the first through holes, and correspondingly, the number of the poles is also plural, and the plurality of poles are inserted into the plurality of the first through holes in a one-to-one correspondence.

[0008] Optionally, the pole block includes a pole connecting piece and a pole plate, the pole is connected to the pole connecting piece at one end close to the battery shell, and the pole connecting piece is used for pole ear welding; the insulating layer includes a first insulating layer and a second insulating layer, the pole plate and the pole connecting piece are respectively located on both sides of the second cover plate, a second through hole is provided on the pole plate at a position corresponding to the first through hole, one end of the pole is connected to the pole connecting piece, and the other end of the pole passes through the first through hole and is embedded in the second through hole; the first insulating layer is located between the pole plate and the second cover plate and between the inner wall of the first through hole and the pole, and the second insulating layer is located between the second cover plate and the pole connecting piece.

[0009] Optionally, the first insulating layer includes a first insulating layer, a second insulating layer and a third insulating layer; the second insulating layer is provided with a third through hole at a position corresponding to the second through hole, the third insulating layer is connected to the inner edge of the third through hole and extends in a direction perpendicular to the plane where the second insulating layer is located, the first insulating layer is connected to the periphery of the second insulating layer and extends in a direction perpendicular to the plane where the second insulating layer is located, the first insulating layer and the third insulating layer extend in opposite directions, the first insulating layer is located at the periphery of the pole plate; the second insulating layer is located between the pole plate and the second cover plate; the third insulating layer is located between the inner wall of the first through hole and the pole; the second insulating layer is provided with a fourth through hole at a position corresponding to the first through hole, the pole is sequentially inserted into the second through hole, the third through hole and the fourth through hole and connected to the pole connecting piece, and the second insulating layer is used to isolate the pole connecting piece from the second cover plate.

[0010] Optionally, a concave platform is provided at the mounting hole, and a convex platform is provided on the outer periphery of the second cover plate, and the convex platform and the concave platform are clamped with each other.

[0011] Optionally, a single pole block is provided on a single first cover plate, or two or more pole blocks are provided on a single first cover plate.

[0012] On the other hand, the present application provides a battery package, which is used for packaging battery cells to form a battery. The battery package includes the battery cover and battery shell mentioned above, and the battery cover is used to seal the battery shell.

[0013] Optionally, there are two battery cover plates, both ends of the battery shell are open, and the two battery cover plates respectively close the two end openings of the battery shell.

[0014] Optionally, it includes a battery cell protection structure, which includes two spacers and two side plates, the two spacers are respectively located between the two ends of the battery cell and the two battery cover plates, and a groove is provided on the spacer at a position corresponding to the mounting hole, and a fifth through hole is provided at the bottom of the groove, for the battery cell tab to pass through the fifth through hole and be electrically connected to the pole; the two side plates are arranged inside the battery shell and are respectively located on both sides of the battery cell.

[0015] In another aspect, the present application provides a battery, comprising the battery package described above and a battery cell located inside the battery package.

[0016] According to the battery cover provided by the present application, the traditional cover structure is split into two large blocks, namely the first cover and the pole block, the pole block is provided with a second cover, the pole is fixed on the second cover, the second cover is inserted into the mounting hole and connected to the first cover, and the lower end of the pole block is used for welding with the pole ear. The cover structure of the present application is simple, with few structural parts, simple manufacturing process and relatively low manufacturing cost; and by splitting the traditional cover structure into the first cover and the second cover, compared with the existing battery cell cover structure, the battery cell structure of the present application can pre-weld the first cover when performing the pole ear welding operation, which plays a role in pre-limiting and fixing the battery cell in the battery shell, and the pole ear of the battery cell passes through the mounting hole, and the displacement of the battery cell will not be caused by the bending force transmission of the pole ear, and then the welding between the pole ear and the second cover is performed, so there is no need to conduct force due to the pole ear. The problem of cell displacement is caused by designing additional tab bending space, thereby effectively improving the overall energy density of the battery. At the same time, after welding the tab, it is only necessary to flip the second cover plate with a smaller area, and there is no need to flip the first cover plate. The flipping space required for the second cover plate with a smaller area is smaller than that of the first cover plate. Therefore, when the tab is welded to the pole block, the tab needs to extend to a shorter length, that is, the overall tab length is smaller, and the space reserved for folding the tab inside the battery cell is smaller, which increases the volume of the internal core of the battery cell, improves the internal space utilization of the battery cell, and increases the volume energy density by 0.5%-5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is an exploded schematic diagram of a battery provided in one embodiment of the present application;

[0018] FIG2 is a cross-sectional view of a battery provided in one embodiment of the present application;

[0019] FIG3 is a cross-sectional view of a first type of pole block provided in one embodiment of the present application;

[0020] FIG4 is a cross-sectional view of a second type of pole block provided in one embodiment of the present application;

[0021] FIG5 is a cross-sectional view of a first insulating layer provided in one embodiment of the present application;

[0022] FIG6 is a schematic diagram of a partial explosion of a battery provided in one embodiment of the present application;

[0023] FIG7 is a schematic structural diagram of a battery cell provided in one embodiment of the present application;

[0024] FIG8 is a schematic structural diagram of a spacer provided in one embodiment of the present application;

[0025] The reference numerals in the drawings of the specification are as follows:

[0026] 1-first cover plate; 11-mounting hole; 12-recess; 13-liquid injection port; 2-pole block; 21-second cover plate; 211-first through hole; 212-boss; 22-pole plate; 221-second through hole; 23-first insulating layer; 231-first insulating layer; 232-second insulating layer; 2321-third through hole; 233-third insulating layer; 24-second insulating layer; 241-fourth through hole; 25-pole; 26-pole connecting piece; 3-spacer; 31-groove; 32-fifth through hole; 4-side plate; 5-battery cell; 51-battery cell protective layer; 6-tab; 61-tab protective layer; 7-battery case. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0028] In the description of this application, it should be understood that the terms "lateral," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0029] In the description of this application, it should be noted that, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood by those skilled in the art in specific circumstances.

[0030] As shown in Figures 1-2, in one embodiment, the present application provides a battery cover plate on one hand, which is used to enclose a battery shell 7 to form a battery. The battery cover plate includes a first cover plate 1 and a pole block 2, and the first cover plate 1 is provided with a mounting hole 11. The pole block 2 is arranged in the mounting hole 11 and is connected to the first cover plate 1; the pole block 2 includes a second cover plate 21, an insulating layer and a pole 25, and the insulating layer is stacked with the second cover plate 21. The second cover plate 21 is provided with a first through hole 211, and the pole 25 is arranged in the first through hole 211. The insulating layer is used to isolate the pole 25 from the second cover plate 21.

[0031] The existing battery cell 5 has a relatively complex internal structure, many structural parts, complex manufacturing process, and relatively high manufacturing cost; and the internal structure occupies a certain space, so the volume energy density of the battery cell 5 is relatively low.

[0032] The present application is to split the traditional battery cover plate structure into two large blocks, namely the first cover plate 1 and the pole block 2. The pole block 2 is inserted into the mounting hole 11 and connected to the first cover plate 1. The lower end of the pole block 2 is welded to the pole connecting piece 26. The battery cover plate structure of the present application is simple, with fewer structural parts, simple manufacturing process and relatively low manufacturing cost. Moreover, by splitting the traditional cover plate structure into the first cover plate 1 and the second cover plate 21, compared with the existing battery cell 5 cover plate structure, the battery cell 5 structure of the present application can pre-weld the first cover plate 1 when performing the pole ear 6 welding operation, which plays a role of pre-limiting and fixing the battery cell 5 in the battery shell 7, and the pole ear 6 of the battery cell 5 passes through the mounting hole 11, and the displacement of the battery cell 5 will not be caused by the bending force transmission of the pole ear 6, and then the welding between the pole ear 6 and the second cover plate 21 is performed. Therefore, there is no need to cause the battery cell to be deformed due to the force transmission of the pole ear 6. 5. An additional bending space for the pole ear 6 is designed to solve the displacement problem, thereby effectively improving the overall energy density of the battery. At the same time, after welding the pole ear 6, it is only necessary to flip the second cover plate 21 with a smaller area, and there is no need to flip the first cover plate 1. The first cover plate 1 can be welded in advance, and the flipping space required for the second cover plate 21 with a smaller area is smaller than that of the first cover plate 1. Therefore, when the pole ear 6 is welded to the pole block 2, the pole ear 6 needs to extend to a shorter length, that is, the overall pole ear 6 length is smaller, and the space reserved for the folded pole ear 6 inside the battery cell 5 is smaller, which increases the internal core volume of the battery cell 5, improves the internal space utilization of the battery cell 5, and increases the volume energy density by 0.5%-5%.

[0033] Specifically, the pole 25 of the present application is inserted into the first through hole 211 on the surface of the second cover plate 21. The pole 25 and the second cover plate 21 are connected by riveting and surface laser welding, which is more reliable than traditional penetration welding.

[0034] As shown in FIG3 , in one embodiment, the second cover plate 21 is provided with a plurality of first through holes 211 , and correspondingly, the number of the poles 25 is also plural, and the poles 25 are inserted into the plurality of first through holes 211 in a one-to-one correspondence.

[0035] Specifically, in the present application, two, three or four first through holes 211 are provided on the second cover plate 21 , and a pole 25 is provided in each first through hole 211 .

[0036] In a preferred embodiment, the second cover plate 21 of the present application is provided with two first through holes 211, and the poles 25 are provided with two, which are correspondingly inserted into the first through holes 211. The present application splits a large pole 25 into two small poles 25, ensuring the overcurrent capacity while reducing the volume of the pole 25, reducing the amount of material used for the pole 25, and reducing costs.

[0037] As shown in FIG3 , in one embodiment, the pole block 2 includes a pole connecting piece 26 . One end of the pole 25 close to the battery housing 7 is connected to the pole connecting piece 26 . The pole connecting piece 26 is used for welding the pole tab 6 .

[0038] Specifically, the present application directly welds the pole tab 6 to the pole 25 via the pole connecting piece 26 , eliminating the need for an intermediate connecting piece or adapter piece, and thus saving material costs.

[0039] As shown in Figure 1, in one embodiment, the pole block 2 also includes a pole plate 22, the insulating layer includes a first insulating layer 23 and a second insulating layer 24, the pole plate 22 and the pole connecting piece 26 are respectively located on both sides of the second cover plate 21, and a second through hole 221 is provided on the pole plate 22 at a position corresponding to the first through hole 211, one end of the pole 25 is connected to the pole connecting piece 26, and the other end of the pole 25 passes through the first through hole 211 and is embedded in the second through hole 221; the first insulating layer 23 is located between the pole plate 22 and the second cover plate 21 and between the inner wall of the first through hole 211 and the pole 25, and the second insulating layer 24 is located between the second cover plate 21 and the pole connecting piece 26.

[0040] Specifically, a second through hole 221 is provided on the pole plate 22, the diameter of the first through hole 211 is larger than the diameter of the second through hole 221, the center of the first through hole 211 is coaxially arranged with the center of the second through hole 221, the pole 25 passes through the second through hole 221 and the first through hole 211, the pole 25 is connected to the pole plate 22 at the second through hole 221 by surface laser welding, the outer wall of the pole 25 does not contact the inner wall of the first through hole 211 of the second cover plate 21, a portion of the first insulating layer 23 is located between the pole plate 22 and the second cover plate 21, and is used to isolate the pole plate 22 from contact with the second cover plate 21; another portion of the first insulating layer 23 is located between the inner wall of the first through hole 211 and the pole 25, and is used to isolate the pole 25 from contact with the second cover plate 21.

[0041] The second insulating layer 24 is located between the second cover plate 21 and the pole connecting piece 26 , and is used to isolate the second cover plate 21 from contacting the pole connecting piece 26 , thereby preventing the battery cell 5 from short-circuiting.

[0042] As shown in Figures 3-5, in one embodiment, the first insulating layer 23 includes a first insulating layer 231, a second insulating layer 232 and a third insulating layer 233; the second insulating layer 232 is provided with a third through hole 2321 at a position corresponding to the second through hole 221, the third insulating layer 233 is connected to the inner edge of the third through hole 2321 and extends in a direction perpendicular to the plane where the second insulating layer 232 is located, the first insulating layer 231 is connected to the periphery of the second insulating layer 232 and extends in a direction perpendicular to the plane where the second insulating layer 232 is located, the first insulating layer 231 and the third insulating layer 233 extend in opposite directions, the first insulating layer 231 is located at the periphery of the pole plate 22; the second insulating layer 232 is located between the pole plate 22 and the second cover plate 21; the third insulating layer 233 is located between the inner wall of the first through hole 211 and the pole 25.

[0043] As shown in Figure 3, in one embodiment, the first insulating layer 231, the second insulating layer 232 and the third insulating layer 233 of the first insulating layer 23 are all filled around the periphery of the pole plate 22, between the pole plate 22 and the second cover plate 21, and between the inner wall of the first through hole 211 and the pole 25 by injection molding. The first insulating layer 231, the second insulating layer 232 and the third insulating layer 233 are integrally formed by injection molding, and are used to isolate the pole plate 22 from contact with the first cover plate 1 to provide insulation between the two; to isolate the pole plate 22 from contact with the second cover plate 21 to provide insulation between the two; and to isolate the pole 25 from contact with the second cover plate 21 to provide insulation between the two.

[0044] Specifically, the first insulating layer 23 is filled by injection molding around the periphery of the pole plate 22, between the pole plate 22 and the second cover plate 21, and between the inner wall of the first through hole 211 and the pole 25; a good insulating interface is formed between the pole plate 22 and the first cover plate 1; a good insulating interface is formed between the pole plate 22 and the second cover plate 21; a good insulating interface is formed between the pole 25 and the second cover plate 21; and the pole 25 can be fixed.

[0045] The first insulating layer 23 may also be made of other insulating materials, such as PP, PE, polyimide or epoxy resin; it can provide good insulation and has high viscosity to fix the pole plate 22, the second cover plate 21 and the pole 25.

[0046] As shown in Figure 4, in another embodiment, the first insulating layer 231 and the second insulating layer 232 of the first insulating layer 23 are filled around the periphery of the pole plate 22 and between the pole plate 22 and the second cover plate 21 by injection molding; the first insulating layer 231 and the second insulating layer 232 are integrally formed by injection molding; the third insulating layer 233 is made of ceramic material and is arranged between the inner wall of the first through hole 211 and the pole 25, and is used to isolate the pole 25 from contact with the second cover plate 21, so as to play an insulating role between the two.

[0047] As shown in Figure 3, in one embodiment, the second insulating layer 24 is provided with a fourth through hole 241 at a position corresponding to the first through hole 211, and the pole 25 is sequentially inserted into the second through hole 221, the third through hole 2321 and the fourth through hole 241 and connected to the pole connecting piece 26. The second insulating layer 24 is used to isolate the pole connecting piece 26 from the second cover plate 21.

[0048] Furthermore, the second insulating layer 24 is also located between the first cover plate 1 and the pole connecting piece 26 , and is used to isolate the first cover plate 1 from contacting the pole connecting piece 26 , thereby preventing the battery cell 5 from short-circuiting.

[0049] The second insulating layer 24 can be filled between the second cover plate 21 and the pole connecting piece 26 by injection molding; the second insulating layer 24 can be filled between the first cover plate 1 and the pole connecting piece 26 by injection molding; thereby forming a good insulating interface between the second cover plate 21 and the pole connecting piece 26; and forming a good insulating interface between the first cover plate 1 and the pole connecting piece 26; and can fix the pole 25.

[0050] The second insulating layer 24 can also be made of other insulating materials, such as PP, PE, polyimide or epoxy resin; it can provide good insulation effect and has high viscosity to fix the second cover plate 21, the first cover plate 1 and the pole 25.

[0051] As shown in FIG. 2 , in one embodiment, a recess 12 is provided at the mounting hole 11 , and a boss 212 is provided on the outer periphery of the second cover plate 21 . The boss 212 and the recess 12 are engaged with each other.

[0052] Specifically, when welding is performed at the joints and gaps between the boss 212 and the recess 12, the stress-bearing position is the recess 12 provided at the mounting hole 11, thereby avoiding the problem of the connection glue being separated due to heat and stress, and improving the safety performance of the battery cover.

[0053] As shown in FIG. 1 , in one embodiment, a single pole block 2 is provided on a single first cover plate 1 .

[0054] Specifically, a single battery is provided with two battery cover plates, which are respectively provided at both ends of the battery housing 7. The battery cover plates at both ends are respectively provided with a single pole block 2, which serves as the positive electrode and the negative electrode respectively. At this time, the single mounting hole 11 is located in the middle of the first cover plate 1; thereby, the first cover plate 1 and the pole block 2 are assembled to form the battery cover plate.

[0055] In one embodiment, two or more pole blocks 2 are provided on a single first cover plate 1 .

[0056] Specifically, the battery housing 7 is a semi-enclosed housing with an open end, and the battery cover plate closes the opening at one end of the battery housing 7. The pole blocks 2 are respectively provided on the left and right sides of the battery cover plate, serving as the positive electrode and the negative electrode, respectively. At this time, the mounting holes 11 are located on the left and right sides of the first cover plate 1, so that the first cover plate 1 and the pole block 2 are assembled to form the battery cover plate.

[0057] As shown in Figure 1, in one embodiment, the present application provides a battery package on the other hand, which is used to package battery cells 5 to form a battery. The battery package includes the battery cover and battery shell 7 mentioned above, and the battery cover is used to close the battery shell 7.

[0058] Specifically, the pole block 2 is arranged on the battery cover, the battery cell 5 is arranged in the battery housing 7 , and the pole 25 of the pole block 2 is electrically connected to the pole lug 6 of the battery cell 5 .

[0059] Furthermore, a liquid injection port 13 is provided on the first cover plate 1 .

[0060] The injection port 13 is used to inject electrolyte into the battery. The electrolyte enters the inner cavity of the battery shell 7 through the injection port 13. After the injection or formation is completed, the injection port 13 is closed. The closing method can be achieved by welding a cover plate or providing an openable cover plate.

[0061] In some embodiments, the material of the first cover plate 1 can be aluminum and its alloys, magnesium and its alloys, iron and its alloys, nickel and its alloys, or copper and its alloys as needed.

[0062] As shown in FIG1 , in one embodiment, there are two battery cover plates. Both ends of the battery housing 7 are open, and the two battery cover plates respectively close the openings at both ends of the battery housing 7 .

[0063] Specifically, the two first cover plates 1 are respectively engaged with the two openings of the battery housing 7 , press-fitted and welded; and then the pole 25 of the pole block 2 is welded to the pole tab 6 to achieve electrical connection.

[0064] There are two pole blocks 2 . The two pole blocks 2 are respectively embedded in the mounting holes 11 of the two first cover plates 1 , and the pole blocks 2 are fixedly connected to the first cover plates 1 by welding.

[0065] As shown in Figures 1 and 8, in one embodiment, a protective structure for the battery cell 5 is included, and the protective structure for the battery cell 5 includes two spacers 3 and two side plates. The two spacers 3 are respectively located between the two ends of the battery cell and the two battery cover plates. A groove 31 is provided on the spacer 3 at a position corresponding to the mounting hole 11, and a fifth through hole 32 is provided at the bottom of the groove 31, for the tab 6 of the battery cell 5 to pass through the fifth through hole 32 and be electrically connected to the pole; the two side plates are arranged inside the battery shell and are respectively located on both sides of the battery cell.

[0066] Specifically, the spacer 3 is made of an insulating material, and the spacer 3 is a plastic plate. The spacer 3 and the first cover plate 1 can be set separately, or the spacer 3 and the first cover plate 1 can be connected as one; the spacer 3 plays a barrier role for the battery cell 5 to prevent the tab 6 from contacting the first cover plate 1 and / or the battery housing 7; the first cover plate 1 is made of metal material, so the plastic plate can play an insulating role to avoid electrical connection between the first cover plate 1 and the battery cell 5.

[0067] The groove 31 abuts against the surface of the battery cell 5, thereby preventing the battery cell 5 from moving. A fifth through hole 32 is provided at the bottom of the groove 31, and the fifth through hole 32 allows the pole ear 6 of the battery cell 5 to pass through the fifth through hole 32 and be connected to the pole connecting piece 26, thereby preventing the pole ear 6 from being inserted upside down and causing a short circuit. The present application splits the traditional cover plate structure into a first cover plate 1 and a pole block 2. In the battery cell 5 structure of the present application, the pole ear 6 needs to extend to a shorter length when welding the pole ear 6 to the pole connecting piece 26, that is, the overall pole ear 6 length is smaller, and the space for the folded pole ear 6 that needs to be reserved inside the battery cell 5 is smaller, thereby increasing the internal winding core volume of the battery cell 5, and the internal space utilization rate of the battery cell 5 is higher, and the volume energy density is increased by 0.5%-5%.

[0068] As shown in FIG. 1 , in one embodiment, the protective structure of the battery cell 5 includes side plates 4 . The side plates 4 are disposed inside the battery housing 7 and located on both sides of the battery cell 5 .

[0069] In one embodiment, two side panels 4 are provided, and the side panels 4 are made of insulating material. The side panels 4 are arranged inside the battery housing 7 and are located on both sides of the battery cell 5. The side panels 4 and the spacer 3 together constitute a battery cell 5 protection structure to fix and protect the battery cell 5.

[0070] Furthermore, four side panels 4 are provided, which are respectively arranged inside the battery housing 7 and located at the periphery of the battery cell 5 . The side panels 4 and the spacers 3 together constitute a protective structure for the battery cell 5 to fix and protect the battery cell 5 .

[0071] In another aspect, the present application provides a battery, comprising the battery package described above and a battery cell 5 located inside the battery package.

[0072] In some embodiments, the battery housing 7 is a square housing, a cylindrical housing, a prismatic housing or other irregular housings.

[0073] As shown in FIG6-7 , in one embodiment, a tab 6 is provided at the end of the battery cell 5 , and a tab protection layer 61 is adhered to the outer surface of the tab 6 .

[0074] Specifically, the tab 6 of the battery cell 5 passes through the fifth through hole 32 and is connected to the pole connecting piece 26. The upper end portion of the tab 6 is welded to the pole connecting piece 26. The outer surface of the lower end portion of the tab 6 is adhered with a tab protective layer 61. The tab protective layer 61 is made of PP material, PE material, polyimide material or epoxy resin material. The tab protective layer 61 is an insulating material. Therefore, after the tab 6 is connected to the pole connecting piece 26, the tab 6 is prevented from contacting other parts, thereby preventing the battery cell 5 from short-circuiting.

[0075] Furthermore, when there are multiple battery cells 5 inside the battery package, the multiple battery cells 5 need to be fixed together, and the multiple pole tabs 6 also need to be fixed together. The pole tab protection layer 61 adheres to the outside of the multiple pole tabs 6 to fix the multiple pole tabs 6 together, which facilitates the subsequent welding of the pole tabs 6 and the pole connecting piece 26.

[0076] As shown in FIG6-7 , in one embodiment, a battery protection layer 51 is adhered to the outer surface of the battery cell 5 .

[0077] Specifically, the battery cell protection layer 51 includes a first battery cell protection layer 51 , a second battery cell protection layer 51 and a third battery cell protection layer 51 . When there are multiple battery cells 5 inside the battery package, the multiple battery cells 5 need to be fixed together and their tabs 6 are also fixed together.

[0078] The first battery cell protective layer 51 and the second battery cell protective layer 51 are both adhered to the outside of the multiple battery cells 5, thereby fixing the multiple battery cells 5 by winding the first battery cell protective layer 51 and the second battery cell protective layer 51 around the outside of the multiple battery cells 5; the third battery cell protective layer 51 is adhered to the ends of the multiple battery cells 5 and does not contact the tabs 6, thereby fixing the multiple battery cells 5 at the ends.

[0079] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A battery cover, wherein: The battery cover is used to enclose the battery shell to form a battery. The battery cover includes a first cover and a pole block. The first cover is provided with a mounting hole. The pole block is arranged in the mounting hole and connected to the first cover; the pole block includes a second cover, an insulating layer and a pole. The insulating layer and the second cover are stacked. The second cover is provided with a first through hole. The pole is arranged in the first through hole. The insulating layer is used to isolate the pole from the second cover.

2. The battery cover according to claim 1, wherein: The second cover plate is provided with a plurality of the first through holes. Correspondingly, the number of the poles is also plural, and the poles are inserted into the plurality of the first through holes in a one-to-one correspondence.

3. The battery cover according to claim 1, wherein: The pole block includes a pole connecting piece and a pole plate, and the end of the pole close to the battery shell is connected to the pole connecting piece, and the pole connecting piece is used for pole ear welding; the insulating layer includes a first insulating layer and a second insulating layer, and the pole plate and the pole connecting piece are respectively located on both sides of the second cover plate, and a second through hole is provided on the pole plate at a position corresponding to the first through hole, one end of the pole is connected to the pole connecting piece, and the other end of the pole passes through the first through hole and is embedded in the second through hole; the first insulating layer is located between the pole plate and the second cover plate and between the inner wall of the first through hole and the pole, and the second insulating layer is located between the second cover plate and the pole connecting piece.

4. The battery cover according to claim 3, wherein: The first insulating layer includes a first insulating layer, a second insulating layer and a third insulating layer; the second insulating layer is provided with a third through hole at a position corresponding to the second through hole, the third insulating layer is connected to the inner edge of the third through hole and extends in a direction perpendicular to the plane where the second insulating layer is located, the first insulating layer is connected to the periphery of the second insulating layer and extends in a direction perpendicular to the plane where the second insulating layer is located, the first insulating layer and the third insulating layer extend in opposite directions, the first insulating layer is located at the periphery of the pole plate; the second insulating layer is located between the pole plate and the second cover plate; the third insulating layer is located between the inner wall of the first through hole and the pole; the second insulating layer is provided with a fourth through hole at a position corresponding to the first through hole, the pole is sequentially inserted into the second through hole, the third through hole and the fourth through hole and connected to the pole connecting piece, and the second insulating layer is used to isolate the pole connecting piece from the second cover plate.

5. The battery cover according to claim 1, wherein: A concave platform is provided at the mounting hole, a convex platform is provided at the outer periphery of the second cover plate, and the convex platform and the concave platform are clamped with each other.

6. The battery cover according to claim 1, wherein: A single pole block is provided on a single first cover plate, or two or more pole blocks are provided on a single first cover plate.

7. A battery package, wherein: The battery package is used for packaging battery cells to form a battery. The battery package comprises a battery cover and a battery shell as claimed in any one of claims 1 to 6. The battery cover seals the battery shell.

8. The battery package according to claim 7, wherein: There are two battery cover plates, and both ends of the battery housing are open. The two battery cover plates respectively close the openings at both ends of the battery housing.

9. The battery package according to claim 8, wherein: It includes a battery cell protection structure, which includes two spacers and two side plates. The two spacers are respectively located between the two ends of the battery cell and the two battery cover plates. A groove is provided on the spacer at a position corresponding to the mounting hole. A fifth through hole is provided at the bottom of the groove, and the battery cell tab passes through the fifth through hole to be electrically connected to the pole; the two side plates are arranged inside the battery shell and are respectively located on both sides of the battery cell.

10. A battery, wherein: The invention comprises a battery package as described in any one of claims 7 to 9 and a battery cell located inside the battery package.

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