Battery

Abstract

The utility model provides a battery which comprises a battery cover plate, the battery cover plate comprises a cover plate body, a pole assembly and a confluence piece, the pole assembly and the confluence piece are located on the two sides of the cover plate body, the confluence piece is electrically connected with the pole assembly, the cover plate body comprises a first cover plate and a second cover plate, the first cover plate is provided with a mounting hole, and the second cover plate is provided with a mounting hole. The convergence sheet partially extends to the mounting hole; tabs are led out from the battery cells, and at the positions of the mounting holes, the ends, away from the battery cells, of the tabs are folded to the faces, away from the battery cells, of the confluence pieces, and the mounting holes are sealed by second cover plates; according to the utility model, the battery cell tab is bent and directly welded on one side, close to the cover plate body, of the confluence sheet, and the structure does not need to reserve a space for folding the tab, so that the volume utilization rate of the battery cell is greatly improved, and the volume energy density of the battery cell is improved; and moreover, the tab is bent and directly welded on the back surface of one side, close to the cover plate body, of the convergence sheet, so that the risk of short circuit caused by inverted insertion of the tab is fundamentally avoided, and the safety performance of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery. Background Art

[0002] The design of the internal structure of the battery cell is crucial to its design, ensuring both internal insulation and safety while also ensuring the cell's energy density. Traditional battery cell designs have numerous internal structural components, occupying a large space, resulting in relatively high manufacturing costs and somewhat limiting energy density improvements. In particular, existing battery installations typically require the battery cell to be placed in a housing, with a single or multiple tabs folded and welded to the cover. This requires internal space to accommodate the tab folding, resulting in relatively high manufacturing costs and limiting battery energy density improvements. Furthermore, this tab structure requires a longer tab length for easy folding, and the longer the tab, the higher the risk of short circuits. Therefore, overcoming these technical issues and drawbacks has become a key issue that needs to be addressed. Utility Model Content

[0003] In order to solve 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 utility model provides a battery.

[0004] The technical solutions adopted by the present invention to solve the above technical problems are as follows:

[0005] The utility model provides a battery, comprising a battery package and a battery cell located inside the battery package, the battery package comprising a battery cover, the battery cover comprising a cover body, a pole assembly and a bus bar, the pole assembly and the bus bar are located on both sides of the cover body, and the bus bar is electrically connected to the pole assembly, the cover body comprises a first cover plate and a second cover plate, a mounting hole is provided on the first cover plate, and the bus bar partially extends to the mounting hole position; the battery cell leads to a pole ear, and at the mounting hole position, the end of the pole ear away from the battery cell is folded to the side of the bus bar away from the battery cell, and the mounting hole is closed by the second cover plate.

[0006] Optionally, a first step is provided on the inner wall of the mounting hole, a second step is provided on the outer periphery of the second cover plate, the first step and the second step overlap each other, and the second cover plate is provided with a liquid injection hole and an explosion-proof valve.

[0007] Optionally, a plastic plate is further included, which is stacked with the cover body, and the plastic plate is provided with a first groove at a position corresponding to the mounting hole, the first groove is provided away from the cover body, and a first through hole is provided at the bottom of the first groove corresponding to the position of the pole ear, and a second through hole is provided on the side wall of the first groove, the length direction of the second through hole is perpendicular to the length direction of the first through hole, the bus bar partially passes through the second through hole and extends into the first groove, and the end of the pole ear away from the battery cell passes through the first through hole and is folded to the side of the bus bar away from the battery cell.

[0008] Optionally, a first insulating member is further included, the opening of the first groove is closed by the first insulating member, and the first insulating member is provided with a third through hole at a position corresponding to the injection hole.

[0009] Optionally, a fourth through hole is provided on the cover body, a fifth through hole is provided on the plastic plate at a position corresponding to the fourth through hole, a boss is provided on the bus bar, and the boss is integrally formed by stretching the bus bar toward the cover body, the boss is embedded in the fifth through hole and the fourth through hole, and the end of the boss is electrically connected to the pole assembly.

[0010] Optionally, the pole assembly includes a second insulating member, a third insulating member and a pole block, the second insulating member is sleeved on the outer wall of the boss and is located between the outer wall of the boss and the inner wall of the fourth through hole, the third insulating member is formed with a second groove on the side away from the cover body, the pole block is embedded in the second groove, the second groove is provided with a sixth through hole at a position corresponding to the fourth through hole, the pole block is provided with a seventh through hole at a position corresponding to the fourth through hole, the free end of the boss of the busbar passes through the fifth through hole, the fourth through hole, and the sixth through hole in sequence, and is embedded in the seventh through hole, and the outer wall of the boss of the busbar is in contact with the inner wall of the seventh through hole of the pole block.

[0011] Optionally, the battery package includes a battery shell, the battery cell is located inside the battery shell, the battery cover closes the battery shell to form a battery, there are multiple battery cells, there are multiple pole ears, the bottom of the first groove is corresponding to the position of the pole ear, and the position of the first through hole is provided, and the side wall of the first groove is provided with multiple second through holes, the busbar includes multiple busbars and a boss, and the multiple busbars form an integrated structure at one end close to the boss, and an open groove is formed between the other ends of two adjacent busbars, and the ends of the multiple busbars away from the boss respectively pass through the relatively set second through holes and are located in the first groove, and the free ends of the pole ears pass through the relatively set first through holes and are bent to be connected to the side of the relatively set busbar close to the cover body.

[0012] Optionally, a single pole assembly and a single busbar are provided on a single battery cover.

[0013] Optionally, two or more pole assemblies and two or more bus bars are provided on a single battery cover, and the two or more pole assemblies and the two or more bus bars are provided in a one-to-one correspondence.

[0014] Optionally, it includes a battery cell protection structure, which includes a battery cell fixing glue and an insulating film. The battery cell fixing glue includes a first battery cell fixing glue and a second battery cell fixing glue. The first battery cell fixing glue is wrapped around the outer surfaces of multiple stacked battery cells. The insulating film is a hollow body with both ends connected. The insulating film is sleeved on the outside of the multiple battery cells and the first battery cell fixing glue. The second battery cell fixing glue adheres to the insulating film and the outer surface of the exposed battery cell.

[0015] According to the battery provided by the present invention, the cell tabs are bent and directly welded to the side of the busbar close to the cover body. This structure does not require space to be reserved for the tabs to be folded, and this structure greatly improves the volume utilization of the cell and increases the volume energy density of the cell. Moreover, the tabs are bent and directly welded to the back side of the busbar close to the cover body, which fundamentally avoids the risk of internal short circuit caused by inverted insertion of the tabs and improves the safety performance of the cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0017] Figure 1 This is a schematic diagram of an explosion of a battery provided by one embodiment of the present utility model;

[0018] Figure 2 This is an exploded schematic diagram of a battery cover provided by one embodiment of the present utility model;

[0019] Figure 3 This is a structural diagram of a cover body in a battery provided by an embodiment of the present utility model;

[0020] Figure 4 This is a structural diagram of a plastic plate in a battery provided by an embodiment of the present utility model;

[0021] Figure 5This is a schematic structural diagram of a busbar in a battery provided by an embodiment of the present utility model;

[0022] The reference numerals in the drawings of the specification are as follows:

[0023] 1-battery cover; 11-cover body; 111-first cover; 1111-mounting hole; 1112-first step; 1113-fourth through hole; 112-second cover; 1121-second step; 1122-liquid injection hole; 1123-explosion-proof valve; 12-pole assembly; 121-second insulating member; 122-third insulating member; 1221-second groove; 1222-sixth through hole; 123-pole block; 1231-seventh through hole ;13-busbar;131-boss;132-busbar;133-opening groove;14-plastic plate;141-first groove;142-first through hole;143-second through hole;144-fifth through hole;15-first insulating member;151-third through hole;2-battery casing;21-battery cell;211-battery cell fixing glue;2111-first battery cell fixing glue;2112-second battery cell fixing glue;212-insulating film;22-ear. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention 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 the present invention and are not intended to limit the present invention.

[0025] In the description of the present invention, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, 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 the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0026] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0027] like Figure 1-Figure 2 As shown, in one embodiment, the utility model provides a battery, comprising a battery package and a battery cell 21 located inside the battery package, the battery package comprising a battery cover 1, the battery cover 1 comprising a cover body 11, a pole assembly 12 and a bus 13, the pole assembly 12 and the bus 13 are located on both sides of the cover body 11, and the bus 13 is electrically connected to the pole assembly 12, the cover body 11 comprises a first cover 111 and a second cover 112, the first cover 111 is provided with a mounting hole 1111, and the bus 13 partially extends to the position of the mounting hole 1111; the battery cell 21 leads out a pole ear 22, and at the position of the mounting hole 1111, the end of the pole ear 22 away from the battery cell 21 is folded to the side of the bus 13 away from the battery cell 21, and the mounting hole 1111 is closed by the second cover 112.

[0028] The existing battery cell 21 has a relatively complex internal structure, many structural parts, complex manufacturing processes, and relatively high manufacturing costs; and the internal structure occupies a certain space, so the volume energy density of the battery cell 21 is relatively low.

[0029] Different from the traditional battery which needs to reserve space for the folding tab 22, the manufacturing cost is relatively high, and the energy density improvement is also limited to a certain extent; the utility model splits the traditional battery cover 1 structure into two large parts, namely the first cover 111 and the second cover 112, the first cover 111 is provided with a mounting hole 1111, the second cover 112 is inserted into the mounting hole 1111 and connected to the first cover 111; by splitting the traditional cover structure into the first cover 111 and the second cover 112, the existing battery cell 21 cover is connected to the battery cell 21 cover. Compared with the plate structure, the battery cell 21 structure of the present application can pre-weld the first cover plate 111 when performing the pole ear 22 welding operation, which plays a role of pre-limiting and fixing the battery cell 21 in the battery shell 2, and can also play a role of pre-limiting and fixing the bus bar 13. The pole ear 22 of the battery cell 21 passes through the mounting hole 1111, and is then bent and directly welded to the back side of the bus bar 13 close to the cover plate body 11. The setting of the mounting hole 1111 allows the pole ear 22 to have enough space to perform the bending and welding operations.

[0030] The pole tab 22 of the present application is bent and directly welded to the back side of the busbar 13 close to the cover body 11. There is no need to design additional bending space for the pole tab 22 due to the bending of the pole tab 22. This structure greatly improves the volume utilization rate of the battery cell 21 and increases the volume energy density of the battery cell 21. Moreover, the pole tab 22 is bent and directly welded to the back side of the busbar 13 close to the cover body 11, which fundamentally avoids the risk of internal short circuit caused by inverted insertion of the pole tab 22 and improves the safety performance of the battery cell 21.

[0031] In some embodiments, the material of the first cover plate 111 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.

[0032] In some embodiments, the material of the second cover plate 112 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.

[0033] like Figure 3 As shown, in one embodiment, a first step 1112 is provided on the inner wall of the mounting hole 1111, a second step 1121 is provided on the outer periphery of the second cover plate 112, the first step 1112 and the second step 1121 overlap each other, and the second cover plate 112 is provided with a liquid injection hole 1122 and an explosion-proof valve 1123.

[0034] Specifically, the pole assembly 12 is located on the first cover plate 111, and the injection hole 1122 and the explosion-proof valve 1123 are located on the second cover plate 112. The cover plate body 11 of the present invention has a simple structure, few structural parts, simple manufacturing process, and relatively low manufacturing cost;

[0035] The first step 1112 and the second step 1121 are overlapped up and down, and are connected by surface laser welding at the overlap and gap between the first step 1112 and the second step 1121, which is more reliable than traditional penetration welding.

[0036] The injection hole 1122 provided on the second cover plate 112 is used to inject electrolyte into the battery. The electrolyte enters the inner cavity of the battery shell 2 through the injection hole 1122. After the injection or formation is completed, the injection hole 1122 can be closed. The closing method can be achieved by welding the cover plate or providing an openable cover plate.

[0037] An annular groove is provided on the explosion-proof valve 1123 provided on the second cover plate 112 to form a structural weakness on the explosion-proof valve 1123. When thermal runaway occurs in the battery, a large amount of gas will be generated, forming high pressure inside the battery. At this time, the explosion-proof valve 1123 breaks at the annular groove to form an opening, which relieves the pressure of the battery and ultimately prevents the battery from exploding due to excessive pressure.

[0038] Specifically, when there are multiple battery cover plates 1 , the injection hole 1122 and the explosion-proof valve 1123 can be separately set on different battery cover plates 1 , or the injection hole 1122 and the explosion-proof valve 1123 can be set on the same battery cover plate 1 .

[0039] like Figure 2 and Figure 4As shown, in one embodiment, a plastic plate 14 is further included, and the plastic plate 14 is stacked with the cover body 11. The plastic plate 14 is provided with a first groove 141 at a position corresponding to the mounting hole 1111, and the first groove 141 is provided away from the cover body 11. A first through hole 142 is provided at the bottom of the first groove 141 corresponding to the position of the pole ear 22, and a second through hole 143 is provided on the side wall of the first groove 141. The length direction of the second through hole 143 is perpendicular to the length direction of the first through hole 142, and the busbar 13 partially passes through the second through hole 143 and extends into the first groove 141, and the end of the pole ear 22 away from the battery cell 21 passes through the first through hole 142 and is folded to the side of the busbar 13 away from the battery cell 21.

[0040] The first groove 141 of the cover body 11 abuts against the surface of the battery cell 21, thereby preventing the battery cell 21 from moving. A first through-hole 142 is provided at the bottom of the first groove 141. The free end of the tab 22 extends through the first through-hole 142. The busbar 13 partially extends through the second through-hole 143 into the first groove 141. The busbar 13 does not contact the first through-hole 142. The end of the tab 22 away from the battery cell 21 is folded over to the side of the busbar 13 facing away from the battery cell 21. The tab 22 and busbar 13 are connected by riveting and surface laser welding.

[0041] The utility model bends the pole tab 22 of the battery cell 21 and directly welds it to the side of the busbar 13 close to the cover body 11. This structure does not require reserved space for the pole tab 22 to be folded. This structure greatly improves the volume utilization rate of the battery cell 21 and increases the volume energy density of the battery cell 21. Moreover, the pole tab 22 is bent and directly welded to the back side of the busbar 13 close to the cover body 11, which fundamentally avoids the risk of internal short circuit caused by inverted insertion of the pole tab 22 and improves the safety performance of the battery cell 21.

[0042] Furthermore, a cover body 11 is provided below the cover body 11 to serve as a barrier to the battery cell 21 , and since the cover body 11 is made of metal, the plastic plate 14 can serve as an insulator to avoid electrical connection between the cover body 11 and the battery cell 21 .

[0043] In some embodiments, the material of the cover body 11 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.

[0044] The cover body 11 of the present application is connected to the plastic plate 14 by ultrasonic welding or gluing. The cover body 11 of the present application is integrated with the plastic plate 14. The cover body 11 of the present application combines insulation safety and cost saving.

[0045] like Figure 2 As shown, in one embodiment, a first insulating member 14 is further included. The opening of the first groove 141 is closed by the first insulating member 14 . The first insulating member 14 is provided with a third through hole 151 at a position corresponding to the injection hole 1122 .

[0046] The first insulating member 14 can be positioned at the opening of the first groove 141 or within the first groove 141 and above the busbar 13, thereby forming a good insulating interface between the busbar 13 and the battery cover 1. The first insulating member 14 has a third through hole 151 at a position corresponding to the injection hole 1122. The electrolyte enters the inner cavity of the battery housing 2 through the injection hole 1122 and the third through hole 151.

[0047] The first insulating member 14 is made of a material including PP, PE, polyimide or epoxy resin, which can provide a good insulation effect.

[0048] like Figure 2-Figure 4 As shown, in one embodiment, a fourth through hole 1113 is provided on the cover body 11, a fifth through hole 1124 is provided on the plastic plate 14 at a position corresponding to the fourth through hole 1113, and a boss 131 is provided on the bus bar 13. The boss 131 is integrally formed by stretching the bus bar 13 toward the cover body 11, and the boss 131 is embedded in the fifth through hole 1124 and the fourth through hole 1113, and the end of the boss 131 is electrically connected to the pole assembly 12.

[0049] Specifically, one end of the busbar 13 is stretched toward the battery cover 1 to form a boss 131 . The boss 131 is integrally formed with the busbar 13 . The busbar 13 is made of aluminum, copper, nickel, iron, titanium or zirconium.

[0050] The boss 131 of the busbar 13 passes through the fifth through hole 1124 and the fourth through hole 1113 in sequence, and an end of the boss 131 is electrically connected to the pole assembly 12 .

[0051] like Figure 2As shown, in one embodiment, the pole assembly 12 includes a second insulating member 121, a third insulating member 122 and a pole block 123, the second insulating member 121 is sleeved on the outer wall of the boss 131 and is located between the outer wall of the boss 131 and the inner wall of the fourth through hole 1113, the third insulating member 122 is formed with a second groove 1221 on the side away from the cover body 11, the pole block 123 is embedded in the second groove 1221, and the second groove 1221 corresponds to the fourth through hole 1113. A sixth through hole 1222 is provided at the position of the through hole 1113, and a seventh through hole 1231 is provided at the position of the pole block 123 corresponding to the fourth through hole 1113. The free end of the boss 131 of the busbar 13 passes through the fifth through hole 1124, the fourth through hole 1113, and the sixth through hole 1222 in sequence, and is embedded in the seventh through hole 1231. The outer wall of the boss 131 of the busbar 13 is fitted with the inner wall of the seventh through hole 1231 of the pole block 123.

[0052] Specifically, the second insulating member 121 can be filled between the boss 131 and the fourth through hole 1113 by injection molding, thereby forming a good insulating interface between the cover body 11 and the boss 131 and fixing the boss 131.

[0053] The second insulating member 121 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 cover body 11 and the boss 131 .

[0054] Specifically, a second groove 1221 is formed on the side of the third insulating member 122 facing away from the cover body 11 , and the pole block 123 is embedded in the second groove 1221 to isolate the pole block 123 from contact with the cover body 11 and prevent the battery cell 21 from short circuiting.

[0055] A sixth through hole 1222 is provided at a position of the second groove 1221 corresponding to the fourth through hole 1113, a seventh through hole 1231 is provided at a position of the pole block 123 corresponding to the fourth through hole 1113, the center of the fifth through hole 1124, the center of the fourth through hole 1113, the center of the sixth through hole 1222 and the center of the seventh through hole 1231 are coaxially arranged, the radii of the fifth through hole 1124, the sixth through hole 1222 and the seventh through hole 1231 are all the same as the radius of the boss 131, and the radius of the fourth through hole 1113 = the radius of the boss 131 + the second insulating member 121 The wall thickness of the fifth through hole 1124 + the height of the fourth through hole 1113 + the height of the sixth through hole 1222 < the height of the boss 131 ≤ the height of the fifth through hole 1124 + the height of the fourth through hole 1113 + the height of the sixth through hole 1222 + the height of the seventh through hole 1231; so that the outer wall of the boss 131 of the busbar 13 is fitted with the inner wall of the seventh through hole 1231 of the pole block 123, and the outer wall of the boss 131 of the busbar 13 and the inner wall of the seventh through hole 1231 of the pole block 123 are connected by surface laser welding.

[0056] like Figure 1 As shown, in one embodiment, the battery package includes a battery shell 2, the battery cell 21 is located inside the battery shell 2, the battery cover 1 closes the battery shell 2 to form a battery, there are multiple battery cells 21, and there are multiple pole ears 22. The bottom of the first groove 141 is corresponding to the position of the pole ear 22 and is provided with a first through hole 142. The side wall of the first groove 141 is provided with a plurality of second through holes 143. The busbar 13 includes a plurality of busbars 132 and a boss 131. The plurality of busbars 132 form an integrated structure at one end close to the boss 131, and an open groove 133 is formed between the other ends of two adjacent busbars 132. The ends of the plurality of busbars 132 away from the boss 131 respectively pass through the relatively arranged second through holes 143 and are located in the first groove 141. The free ends of the pole ears 22 pass through the relatively arranged first through holes 142 and are bent to be connected to the side of the relatively arranged busbar 13 close to the cover body 11.

[0057] In some embodiments, the battery housing 2 is a square housing, a cylindrical housing, a prismatic housing, or other irregular housings.

[0058] In a preferred embodiment, two battery cells 21 are provided inside the battery housing 2, and a first through hole 142 is provided at the bottom of the first groove 141 corresponding to the position of the pole ear 22. The pole ear 22 is sheet-shaped, and the first through hole 142 is long and strip-shaped. Two second through holes 143 are provided on a single side wall of the first groove 141. The busbar 13 includes two busbars 132 and a boss 131. One end of the two busbars 132 forms an integrated structure, forming a U shape; the two busbars 132 respectively pass through the second through holes 143 set opposite to each other and are located in the first groove 141. The free end of the pole ear 22 passes through the first through hole 142 set opposite to each other and is bent and connected to the busbars set opposite to each other. The sheet 13 is connected to one side close to the cover body 11. The pole tab 22 of the present application can be bent and directly welded to the corresponding busbar 132. There is no need to gather multiple pole tabs 22 together to form a pole tab 22 group and then weld it to the pole column. This structure does not need to extend the length of the pole tab 22 accordingly for the pole tabs 22 to be gathered together, nor does it need to reserve space for the folded pole tab 22 group. This structure greatly improves the volume utilization of the battery cell 21 and improves the volume energy density of the battery cell 21. Moreover, the present application bends a single pole tab 22 and directly welds it to the relative busbar 132, which fundamentally avoids the risk of internal short circuit caused by the inverted insertion of the pole tab 22 and improves the safety performance of the battery cell 21.

[0059] In one embodiment, a single battery cover plate 1 is provided with a single pole assembly 12 and a single busbar 13 .

[0060] Specifically, a single battery is provided with two battery cover plates 1, and the two battery cover plates 1 are respectively arranged at both ends of the battery shell 2. A single pole assembly 12 is respectively provided on the battery cover plates 1 at both ends, serving as the positive pole and the negative pole respectively. A fourth through hole 1113 is provided on the single cover plate body 11, and a second through hole 143 is provided on the side wall of the first groove 141 close to the fourth through hole 1113. The end of the busbar 13 away from the boss 131 passes through the second through hole 143 and is located in the first groove 141. The free end of the pole ear 22 passes through the oppositely arranged first through hole 142 and is bent and welded to the busbar 13. At least one of the two battery cover plates 1 has a first cover plate 111 and a second cover plate 112. The second cover plate 112 is embedded in the mounting hole 1111 of the first cover plate 111 and welded to the mounting hole 1111.

[0061] like Figure 1 As shown, in one embodiment, two or more pole assemblies 12 and two or more bus bars 13 are provided on a single battery cover 1, and the two or more pole assemblies 12 and the two or more bus bars 13 are provided in a one-to-one correspondence.

[0062] Specifically, the battery shell 2 is a semi-enclosed shell with an opening at one end, and the battery cover 1 closes the opening at one end of the battery shell 2. The left and right sides of the battery cover 1 are respectively provided with pole assemblies 12, which serve as the positive electrode and the negative electrode respectively. Two fourth through holes 1113 are provided on the single cover body 11, and second through holes 143 are provided on the two side walls of the first groove 141 respectively close to the two fourth through holes 1113. The ends of the two busbars 13 away from the boss 131 both pass through the second through hole 143 and are located in the first groove 141. The free ends of the pole ears 22 pass through the oppositely arranged first through holes 142 and are bent and welded to the relative busbar 13. At this time, the mounting hole 1111 is located in the middle of the first cover 111, so that the first cover 111 and the second cover 112 are assembled to form the battery cover 1.

[0063] like Figure 1 As shown, in one embodiment, it includes a battery cell 21 protection structure, and the battery cell 21 protection structure includes a battery cell fixing glue 211 and an insulating film 212. The battery cell fixing glue 211 includes a first battery cell fixing glue 2111 and a second battery cell fixing glue 2112. The first battery cell fixing glue 2111 is wrapped around the outer surface of a plurality of stacked battery cells 21. The insulating film 212 is a hollow body with two ends connected. The insulating film 212 is sleeved on the outside of the plurality of battery cells 21 and the first battery cell fixing glue 2111. The second battery cell fixing glue 2112 adheres to the insulating film 212 and the outer surface of the exposed battery cell 21.

[0064] Specifically, the battery case 2 of the present application has a plurality of battery cells 21, and the plurality of battery cells 21 are stacked. A first battery cell fixing glue 2111 is first used to wrap around the outer surfaces of the plurality of stacked battery cells 21, thereby preliminarily fixing the plurality of battery cells 21; then, the outer surfaces of the plurality of stacked battery cells 21 are fully wrapped by the insulating film 212, and then the insulating film 212 is fixed by the second battery cell fixing glue 2112; or when the insulating film 212 only wraps part of the surface of the plurality of stacked battery cells 21 and does not wrap both ends thereof, the insulating film 212 and the battery cells 21 are fixed simultaneously by the second battery cell fixing glue 2112;

[0065] The first battery cell fixing glue 2111 , the second battery cell fixing glue 2112 and the insulating film 212 are all made of insulating materials. The first battery cell fixing glue 2111 and the second battery cell fixing glue 2112 are each independently selected from PP glue, PE glue, polyimide glue or epoxy resin glue.

[0066] The insulating film 212 is a mylar film.

[0067] The battery cell 21 is wrapped and fixed by the first battery cell fixing glue 2111 , the insulating film 212 and the second battery cell fixing glue 2112 , so that the safety performance of the battery cell 21 can be improved.

[0068] Furthermore, the protective structure for the battery cell 21 can also be two spacers and two side plates. The two spacers are respectively located between the two ends of the battery cell 21 and the battery cover 1. The side plates are arranged inside the battery housing 2 and on both sides of the battery cell 21. The side plates and the spacers together constitute the protective structure for the battery cell 21, which fixes and protects the battery cell 21.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery, characterized in that: It includes a battery package and a battery cell located inside the battery package, the battery package includes a battery cover, the battery cover includes a cover body, a pole assembly and a bus bar, the pole assembly and the bus bar are located on both sides of the cover body, and the bus bar is electrically connected to the pole assembly, the cover body includes a first cover plate and a second cover plate, the first cover plate is provided with a mounting hole, and the bus bar partially extends to the mounting hole position; the battery cell leads to a tab, and at the mounting hole position, the end of the tab away from the battery cell is folded to the side of the bus bar away from the battery cell, and the mounting hole is closed by the second cover plate.

2. The battery according to claim 1, wherein: A first step is provided on the inner wall of the mounting hole, a second step is provided on the outer periphery of the second cover plate, the first step and the second step are overlapped with each other, and a liquid injection hole and an explosion-proof valve are provided on the second cover plate.

3. The battery according to claim 2, wherein: It also includes a plastic plate, which is stacked with the cover body, and the plastic plate is provided with a first groove at a position corresponding to the mounting hole, the first groove is provided away from the cover body, and a first through hole is provided at the bottom of the first groove corresponding to the position of the pole ear, and a second through hole is provided on the side wall of the first groove, and the length direction of the second through hole is perpendicular to the length direction of the first through hole, the bus bar partially passes through the second through hole and extends into the first groove, and the end of the pole ear away from the battery cell passes through the first through hole and is folded to the side of the bus bar away from the battery cell.

4. The battery according to claim 3, wherein: It also includes a first insulating member, the opening of the first groove is closed by the first insulating member, and the first insulating member is provided with a third through hole at a position corresponding to the liquid injection hole.

5. The battery according to claim 3, wherein: A fourth through hole is provided on the cover body, a fifth through hole is provided on the plastic plate at a position corresponding to the fourth through hole, a boss is provided on the bus bar, and the boss is integrally formed by stretching the bus bar toward the cover body, the boss is embedded in the fifth through hole and the fourth through hole, and the end of the boss is electrically connected to the pole assembly.

6. The battery according to claim 5, characterized in that: The pole assembly includes a second insulating member, a third insulating member and a pole block, the second insulating member is sleeved on the outer wall of the boss and is located between the outer wall of the boss and the inner wall of the fourth through hole, the third insulating member is formed with a second groove on the side away from the cover body, the pole block is embedded in the second groove, the second groove is provided with a sixth through hole at a position corresponding to the fourth through hole, the pole block is provided with a seventh through hole at a position corresponding to the fourth through hole, the free end of the boss of the busbar passes through the fifth through hole, the fourth through hole, and the sixth through hole in sequence, and is embedded in the seventh through hole, and the outer wall of the boss of the busbar is in contact with the inner wall of the seventh through hole of the pole block.

7. The battery according to claim 5, characterized in that: The battery package includes a battery shell, the battery cell is located inside the battery shell, the battery cover closes the battery shell to form a battery, there are multiple battery cells, there are multiple pole ears, the bottom of the first groove is corresponding to the position of the pole ear, and the first through hole is provided, and the side wall of the first groove is provided with multiple second through holes, the busbar includes multiple busbars and a boss, and the multiple busbars form an integrated structure at one end close to the boss, and an open groove is formed between the other ends of two adjacent busbars, and the ends of the multiple busbars away from the boss respectively pass through the relatively arranged second through holes and are located in the first groove, and the free ends of the pole ears pass through the relatively arranged first through holes and are connected to the side of the relatively arranged busbar close to the cover body after being bent.

8. The battery according to claim 1, wherein: A single pole assembly and a single busbar are provided on a single battery cover.

9. The battery according to claim 1, wherein: Two or more pole assemblies and two or more bus bars are provided on a single battery cover, and the two or more pole assemblies and the two or more bus bars are provided in a one-to-one correspondence.

10. The battery according to claim 5, characterized in that: It includes a battery cell protection structure, which includes a battery cell fixing glue and an insulating film. The battery cell fixing glue includes a first battery cell fixing glue and a second battery cell fixing glue. The first battery cell fixing glue is wrapped around the outer surfaces of multiple stacked battery cells. The insulating film is a hollow body with two ends connected. The insulating film is sleeved on the outside of the multiple battery cells and the first battery cell fixing glue. The second battery cell fixing glue adheres to the insulating film and the outer surface of the exposed battery cell.

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