Battery

Abstract

A battery (100), comprising a cell assembly (1), at least two cover plate assemblies (5), and a metal shell assembly, wherein the cell assembly (1) is connected to the cover plate assemblies (5). The metal shell assembly comprises a first metal shell (301) and a second metal shell (302); the first metal shell (301) and the second metal shell (302) are sealedly connected; the first metal shell (301) and the second metal shell (302) each are provided with an accommodating groove (304) and a welding skirt (303); two accommodating grooves (304) are oppositely arranged to form an accommodating cavity for accommodating the cell assembly (1); each welding skirt (303) is arranged on the periphery of an open end of the corresponding accommodating groove (304), and each welding skirt (303) extends away from the corresponding accommodating groove (304) from the open end of the corresponding accommodating groove (304); two welding skirts (303) are sealedly welded. The cover plate assemblies (5) are welded between the two welding skirts (303). According to the battery (100), the stamping depth of the shell is reduced, the wall thickness is reduced, the processing cost is reduced, the strength and sealing performance of the battery (100) are also ensured, the heat conduction and heat dissipation performance is improved, and the energy density is increased.

Description

A battery

[0001] This application claims priority to three Chinese patent applications filed with the China Patent Office on August 1, 2023, with application number 202310964758.6 and invention name “A Battery”, application number 202310963479.8 and invention name “Inner Insulating Film and Battery”, and application number 202310961143.8 and invention name “Outer Insulating Film and Battery”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the field of energy storage technology, and specifically relates to a battery. Background Art

[0003] In recent years, power batteries have been widely used in electric vehicles, backup power systems, microgrid energy storage systems and other fields due to their advantages such as high energy density and long life. Taking lithium-ion batteries as an example, the existing lithium-ion batteries mainly have two structures: square lithium-ion batteries and soft-pack lithium-ion batteries. For square lithium-ion batteries, in order to ensure the overall strength of the battery, the thickness of the square aluminum shell used is relatively thick (0.4mm~0.5mm). The processing cost of the thicker square aluminum shell is high, and the overall weight of the battery is heavy, and the energy density of the battery is low. For soft-pack lithium-ion batteries, the shell is made of stamped aluminum-plastic film, and then the pole core assembly is melted into the accommodation cavity formed by the aluminum-plastic film by hot melting. The connecting piece connected to the pole core assembly is also connected to the aluminum-plastic film by hot melting. The use of aluminum-plastic film and sealing by hot melting has problems such as poor sealing of the aluminum-plastic film, poor thermal conductivity, low life, and battery leakage.

[0004] Summary of the Invention

[0005] In order to solve the above problems, the present application provides a battery, in which the first metal shell and the second metal shell are both provided with a receiving groove for accommodating the pole core assembly, the pole core assembly is accommodated in the receiving groove, and the two metal shells are sealed and connected by welding. The use of a metal shell provided with a receiving groove can not only reduce the wall thickness of the metal shell, but also ensure the strength and sealing of the battery, and improve the heat dissipation and thermal conductivity of the battery.

[0006] The present application provides a battery, comprising: a pole core assembly;

[0007] at least two cover plate assemblies, the pole core assembly being connected to the cover plate assemblies;

[0008] A metal shell assembly includes a first metal shell and a second metal shell, the first metal shell and the second metal shell are sealed and connected, the first metal shell and the second metal shell are both provided with a receiving groove and a welding skirt, the receiving groove of the first metal shell and the receiving groove of the second metal shell are arranged opposite to each other to form an accommodating cavity for accommodating the pole core assembly, the welding skirt of the first metal shell is arranged at the outer periphery of the open end of the receiving groove of the first metal shell, and the welding skirt of the second metal shell is arranged at the outer periphery of the open end of the receiving groove of the second metal shell, the welding skirt of the first metal shell extends from the open end of the receiving groove of the first metal shell in a direction away from the receiving groove of the first metal shell, and the welding skirt of the first metal shell is seal-welded to the welding skirt of the second metal shell; the cover plate assembly is welded between the welding skirt of the first metal shell and the welding skirt of the second metal shell. Beneficial effects:

[0009] Compared with the prior art, the battery provided in this application has the following main effects:

[0010] (1) The metal shell assembly used can reduce the stamping depth of the shell and the wall thickness of the shell while maintaining the rigidity and structural strength of the shell, thereby improving the energy density of the battery.

[0011] (2) The shell thickness in the metal shell assembly can be made thinner, reducing processing costs. At the same time, compared with the traditional square shell, the metal shell provided by this application is lower in cost and easier to implement.

[0012] (3) Both metal shells are provided with welding skirts, which are sealed and welded to improve the sealing of the battery; at the same time, the setting of the welding skirts also improves the thermal conductivity and heat dissipation of the battery, reduces the temperature rise of the battery during charging and discharging, and extends the battery life.

[0013] (4) The cover plate assembly is welded between two welding skirts, the welding area between the cover plate assembly and the shell assembly is increased, the welding process requirements are reduced, and the preparation cost of the battery is reduced.

[0014] (5) When the battery is assembled, the pole core assembly is placed in the accommodating cavity formed by the accommodating groove by splicing and welding the first metal shell and the second metal shell. This can prevent the pole core assembly from being damaged by the pole core assembly when entering the shell in the existing square battery, thereby improving the battery production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a schematic diagram of a battery explosion according to an embodiment;

[0016] FIG2 is a schematic structural diagram of a second metal shell;

[0017] Figure 3 is a schematic structural diagram of the cover assembly;

[0018] FIG4 is a schematic diagram of a battery structure according to an embodiment;

[0019] FIG5 is a schematic diagram of a cross-sectional structure of a battery according to an embodiment;

[0020] FIG6 is an enlarged view of portion A in FIG5 ;

[0021] FIG7 is a schematic diagram of the inner insulating film provided by the present application in use;

[0022] FIG8 is an overall schematic diagram of the inner insulating film provided by the present application;

[0023] FIG9 is an exploded schematic diagram of the inner insulating film provided by the present application;

[0024] FIG10 is a schematic diagram of an explosion of a battery provided by the present application;

[0025] FIG11 is an exploded schematic diagram of a cover assembly of a battery provided by the present application;

[0026] FIG12 is an overall schematic diagram of the outer insulating film provided by the present application;

[0027] FIG13 is an exploded schematic diagram of the outer insulating film provided by the present application;

[0028] FIG14 is an exploded schematic diagram of the outer insulating film and the battery housing provided by the present application;

[0029] FIG15 is a schematic diagram of an explosion of a battery provided by the present application;

[0030] FIG16 is a schematic diagram of the exploded structure of a cover assembly of a battery provided in the present application.

[0031] Among them, 100, battery; 1, pole core assembly; 201, first inner insulating film; 202, second inner insulating film; 203, first insulating film; 204, second insulating film; 2041, first groove; 205, third insulating film; 2051, second concave cavity; 206, fourth insulating film; 207, connector; 301, first metal shell; 302, second metal shell; 303, welding skirt; 304, receiving groove; 305, groove; 3051, side wall; 3052, bottom wall; 401, first outer insulating film; 402, second outer insulating film; 403, fifth insulating film; 4031, third concave cavity; 404, sixth insulating film; 4041, third groove; 405, seventh insulating film; 4051, fourth concave cavity; 406, eighth insulating film; 4061, fourth groove; 5, cover plate assembly; 501. Main body; 502. Extension; 5021. Straight section; 5022. Transition section; 503. Cover member; 504. Injection-molded part; 5041. First ring body; 5042. Second ring body; 5043. Third ring body; 6. Welding area; 601. Welding layer; 602. Adhesive film layer; 7. Pole; 91. First inner cavity; 92. Second inner cavity. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present 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.

[0033] In order to illustrate the technical solution of the present application, specific embodiments are provided below.

[0034] As shown in Figures 1-3 and Figures 4-6, an embodiment of the present application provides a battery 100, comprising a pole core assembly 1, at least two cover plate assemblies 5, and a metal shell assembly, wherein the pole core assembly 1 is connected to the cover plate assembly 5. It is understood that the battery 100 provided in the present application includes at least two cover plate assemblies 5, the cover plate assemblies 5 contain pole posts, and the pole core assembly 1 contains tabs, which are connected to the pole posts by welding to achieve the connection between the pole core assembly 1 and the cover plate assembly 5.

[0035] The metal shell assembly includes a first metal shell 301 and a second metal shell 302. The first metal shell 301 and the second metal shell 302 are both provided with a receiving groove 304 and a welding skirt 303. The two receiving grooves 304 are arranged relative to each other to form a receiving cavity for receiving the pole core assembly 1. The welding skirt 303 is arranged on the outer periphery of the open end of the receiving groove 304, and the welding skirt 303 extends from the open end of the receiving groove 304 in a direction away from the receiving groove 304.

[0036] Specifically, the two receiving grooves 304 are defined as a first receiving groove and a second receiving groove, and the two welding skirts 303 are defined as a first welding skirt and a second welding skirt. The first metal shell 301 is provided with the first receiving groove and the first welding skirt, and the second metal shell 302 is provided with the second receiving groove and the second welding skirt. The first welding skirt is provided at the periphery of the open end of the first receiving groove and extends away from the open end of the first receiving groove. The second welding skirt is provided at the periphery of the open end of the second receiving groove and extends away from the open end of the second receiving groove.

[0037] The first accommodating groove and the second accommodating groove are arranged opposite to each other, and can form an accommodating cavity for accommodating the pole core assembly 1.

[0038] The two welding skirts 303 are sealed and welded together.

[0039] Specifically, the first welding skirt and the second welding skirt are welded together by laser welding, electromagnetic pulse welding, resistance welding, electron beam welding, etc., so that the first metal shell 301 and the second metal shell 302 are sealed and connected.

[0040] The first metal shell 301 and the second metal shell 302 are made of metal, preferably a lightweight and strong metal, such as aluminum or stainless steel. The first welding skirt is also made of metal, preferably the same material as the first metal shell 301. The second welding skirt is also made of metal, preferably the same material as the second metal shell 302. Since the first and second welding skirts are made of metal, they can be welded together to achieve a sealed connection between the first and second metal shells 301 and 302.

[0041] Compared to using a plastic shell, the battery 100 can only be sealed by hot melting the two plastic shells, which has poor sealing performance and affects the performance of the battery 100. The shell of the present application is made of metal, and the first metal shell 301 and the second metal shell 302 are sealed and welded by laser welding, electromagnetic pulse welding, resistance welding, electron beam welding, etc., which can improve the sealing performance of the battery 100, increase the cycle life of the battery 100, and ensure that the battery 100 has high strength.

[0042] The cover plate assembly 5 is welded between the two welding skirts 303 .

[0043] As shown in Figure 1, the side of the first welding skirt facing the second metal shell 302 is seal-welded to the side of the cover plate assembly 5 facing the first welding skirt, and the side of the second welding skirt facing the first metal shell 301 is seal-welded to the side of the cover plate assembly 5 facing the second welding skirt. Compared to the prior art, the cover plate assembly 5 is welded between the first and second welding skirts, achieving a sealed connection between the cover plate assembly 5 and the first and second welding skirts, thereby improving the sealing performance of the battery 100.

[0044] It should be noted that the sealing welding method in this application includes laser welding, electromagnetic pulse welding, resistance welding, electron beam welding and other welding methods.

[0045] Compared with the prior art, the battery 100 provided in this application has the following main effects:

[0046] (1) The metal shell assembly used can reduce the stamping depth of the shell and the wall thickness of the shell while maintaining the rigidity and structural strength of the shell, thereby improving the energy density of the battery 100.

[0047] (2) The shell thickness in the metal shell assembly can be made thinner, reducing processing costs. At the same time, compared with the traditional square shell, the metal shell provided by this application is lower in cost and easier to implement.

[0048] (3) Both metal shells are provided with welding skirts 303, which are sealed and welded to improve the sealing of the battery 100; at the same time, the setting of the welding skirts 303 also improves the thermal conductivity and heat dissipation of the battery 100, reduces the temperature rise of the battery 100 during charging and discharging, and extends the service life of the battery 100.

[0049] (4) The cover plate assembly 5 is welded between the two welding skirts, the welding area between the cover plate assembly 5 and the shell assembly is increased, the welding process requirements are reduced, and the preparation cost of the battery 100 is reduced.

[0050] (5) When the battery 100 is assembled, the pole core assembly 1 is placed in the accommodating cavity formed by the accommodating groove 304 by splicing and welding the first metal shell 301 and the second metal shell 302. This can prevent the pole core assembly 1 from being damaged by the shell in the existing square battery 100, thereby improving the production efficiency of the battery 100.

[0051] In one embodiment, the cover plate assembly 5 is further provided with a first metal welding surface and a second metal welding surface, the first metal welding surface is sealed welded to the welding skirt 303 of the first metal shell 301, and the second metal welding surface is sealed welded to the welding skirt 303 of the second metal shell 302.

[0052] Specifically, the cover plate assembly 5 is provided with a first metal welding surface, which is seal-welded to the first welding skirt. The cover plate assembly 5 is also provided with a second metal welding surface, which is seal-welded to the second welding skirt. Welding one side of the cover plate assembly 5 to the first metal shell 301 via the first metal welding surface, and welding the other side of the cover plate assembly 5 to the second metal shell 302 via the second metal welding surface, can improve the connection strength and sealing between the cover plate assembly 5 and the first and second metal shells 301, 302, and prevent leakage of the battery 100.

[0053] In one embodiment, each welding skirt 303 is provided with a groove 305 for accommodating the cover plate assembly 5 , and the groove 305 is provided on both sides of the metal shell assembly.

[0054] Specifically, as shown in Figure 1, two cover plate assemblies 5 are arranged on both sides of the metal shell, and a first groove is provided on one side of the corresponding first welding skirt, a second groove is provided on the side of the first welding skirt facing away from the first groove, a third groove is provided on one side of the second welding skirt, and a fourth groove is provided on the side of the second welding skirt facing away from the third groove.

[0055] There are two cover plate assemblies 5, defined as a first cover plate assembly and a second cover plate assembly. The first cover plate assembly is arranged in a second accommodating cavity formed by the first groove and the third groove being arranged oppositely, and the second cover plate assembly is arranged in a third accommodating cavity formed by the second groove and the fourth groove being arranged oppositely.

[0056] In one embodiment, the cover plate assembly 5 includes a main body 501 and two extensions 502 , the main body 501 is disposed between the two extensions 502 , and the thickness of the extension 502 gradually decreases from one end close to the main body 501 in a direction away from the main body 501 .

[0057] The main body 501 can be welded to the tab in the pole core assembly 1. The thickness of the extension 502 gradually decreases from one end of the main body 501 toward the direction away from the main body 501, achieving a sealed weld between the first metal shell 301 and the second metal shell 302 and the cover plate assembly 5, respectively, to prevent leakage of the battery 100. Without the extension 502, a gap would exist between the first metal shell 301 and the second metal shell 302 near the cover plate assembly 5, affecting the sealing of the battery 100.

[0058] It should be noted that the surface of the main body 501 and the extension 502 facing the first metal shell 301 is the first metal welding surface, and the surface of the main body 501 and the extension 502 facing the second metal shell 302 is the second metal welding surface.

[0059] In one embodiment, the extension portion 502 includes a transition section 5022 and a straight section 5021 , and the transition section 5022 is connected between the main body 501 and the straight section 5021 .

[0060] The welding skirt 303 is a flat surface, and the extension 502 includes a straight segment 5021, which is also a flat surface. This makes welding between flat surfaces easier and reduces the welding process. As shown in Figure 3, the straight segment 5021 is composed of a line segment that forms a certain angle with the plane, and the thickness of the straight segment 5021 gradually decreases from the transition segment 5022 toward the direction away from the transition segment 5022. The straight segment 5021 with this structure can achieve a sealed welding between the first welding skirt, the second welding skirt, and the straight segment 5021. As shown in Figure 3, the transition segment 5022 is an arcuate segment, that is, an arc-shaped transition is formed between the main body 501 and the straight segment 5021. The provision of the transition segment 5022 in the extension 502 facilitates the welding of the cover assembly 5 with the first welding skirt and the second welding skirt, thereby improving the sealing between the cover assembly 5 and the first metal shell 301 and the second metal shell 302.

[0061] As shown in FIG3 , in a cover assembly 5 provided in one embodiment, the main body 501 is a columnar body, the extension portion 502 includes a straight line segment 5021 , and the transition segment 5022 is an arc segment. It is understandable that the main body 501 can also be other shapes, and the corresponding transition segment 5022 can also be other shapes.

[0062] In one embodiment, the groove 305 includes a bottom wall 3052 and two side walls 3051 , the bottom wall 3052 is disposed between the two side walls 3051 , the bottom wall 3052 is sealed and welded to the main body 501 , and the side walls 3051 are sealed and welded to the transition section 5022 and the straight section 5021 , respectively.

[0063] The cover assembly 5 is positioned within the recess 305, with the bottom wall 3052 of the recess 305 being sealedly connected to the main body 501 by welding. The sidewall 3051 of the bottom wall 3052 is also sealedly welded to the transition section 5022. The sidewall 3051 is also sealedly welded to the straight section 5021. It is understood that the shape of the sidewall 3051 must match that of the transition section 5022 and the straight section 5021, thereby achieving a secure weld between the sidewall 3051 and the extension section.

[0064] In one embodiment, the cover plate assembly 5 includes a metal part, an injection molded part and a pole. The injection molded part is arranged on the periphery of the pole, and the metal part is arranged on the periphery of the injection molded part. The pole and the metal part are sealed and connected by injection molding of the injection molded part. The injection molded part mainly plays the role of insulation and sealing.

[0065] In one embodiment, the two cover plate assemblies 5 are arranged on both sides of the metal shell assembly.

[0066] Specifically, the two cover plate assemblies 5 are defined as a first cover plate assembly and a second cover plate assembly. Both cover plate assemblies 5 are disposed on both sides of the metal shell assembly, and the positive and negative electrodes of the battery 100 are disposed on both sides of the battery 100. It is understood that the pole core assembly 1 includes a positive electrode tab and a negative electrode tab, the first cover plate assembly is the positive electrode tab assembly, and the second cover plate assembly is the negative electrode tab assembly. The first cover plate assembly is connected to the positive electrode tab by welding, and the second cover plate assembly is connected to the negative electrode tab by welding.

[0067] In one embodiment, the wall thickness of the first metal shell 301 is 0.1 mm to 0.2 mm, and the wall thickness of the second metal shell 302 is 0.1 mm to 0.2 mm; the receiving groove 304 is formed by stamping.

[0068] Compared with the existing square aluminum shell, the battery 100 provided in one embodiment can directly form a accommodating cavity for the pole core assembly 1 by splicing the first metal shell 301 and the second metal shell 302. The first metal shell 301 and the second metal shell 302 are sealed by welding the welding skirt 303 provided therein. The groove 305 provided in the welding skirt 303 is used to place the cover plate assembly 5, and the cover plate assembly 5 is sealed and connected to the groove 305 by welding. While ensuring the strength and sealing of the battery 100, the thickness of the shell can also be reduced.

[0069] It should be noted that the first metal shell 301 and the second metal shell 302 can be symmetrically arranged with the plane where the pole core assembly 1 is located as the center, or the first metal shell 301 and the second metal shell 302 are not symmetrically arranged with the plane where the pole core assembly 1 is located as the center.

[0070] In the battery 100 provided in one embodiment, the wall thickness of the first metal shell 301 is 0.05mm-0.5mm, and the wall thickness of the second metal shell 302 is 0.05mm-0.5mm. The thin shell wall thickness reduces the overall weight of the battery 100, improves the energy density of the battery 100, and reduces the cost of the battery 100.

[0071] The housing is made of metal, and the receiving groove 304 is formed by stamping.

[0072] In some preferred embodiments, the wall thickness of the first metal shell 301 is 0.1 mm to 0.3 mm, and the wall thickness of the second metal shell 302 is 0.1 mm to 0.3 mm.

[0073] As shown in Figure 1, the pole core assembly 1 is square, and the first metal shell 301 and the second metal shell 302 are also square. It can be understood that if the pole core assembly 1 is cylindrical, then the first metal shell 301 and the second metal shell 302 are assembled to form a cylindrical shape. This application does not limit the shapes of the pole core assembly 1, the first metal shell 301, and the second metal shell 302. The shapes of the first metal shell 301 and the second metal shell 302 are adjusted accordingly based on the shape of the pole core assembly 1.

[0074] In one embodiment, the battery 100 further includes an inner insulating film, which is disposed between the pole core assembly 1 and the metal shell assembly, and the inner insulating film is coated on the periphery of the pole core assembly 1 and the cover plate assembly 5 .

[0075] As shown in Figure 1, the inner insulating film includes a first inner insulating film 201 and a second inner insulating film 202. The first inner insulating film 201 is disposed between the first metal shell 301 and the pole core assembly 1, and covers the outer periphery of the pole core assembly 1 and the cover plate assembly 5. The second inner insulating film 202 is disposed between the second metal shell 302 and the pole core assembly 1, and covers the outer periphery of the pole core assembly 1 and the cover plate assembly 5. The first inner insulating film 201 and the second inner insulating film 202 both protect the pole core assembly 1 and provide insulation.

[0076] As shown in Figure 1 , the inner insulating film covers the main body 501 and transition section 5022 of the cover plate assembly 5, preventing the tabs in the pole core assembly 1 from shorting out with the housing assembly and providing insulation. The inner insulating film also protects the pole core assembly 1. It is understood that the inner insulating film can also cover the main body 501 and extension 502 of the cover plate assembly 5.

[0077] The inner insulating film is fixedly connected to the cover plate assembly 5 by hot melting. The inner insulating film is connected to the pole core assembly 1 by gluing.

[0078] Specifically, the inner insulating film is fixedly connected to the injection molded part in the cover assembly 5 by hot melting. The first inner insulating film 201, the pole core assembly 1, and the second inner insulating film 202 can be fixed by using tape.

[0079] In one embodiment, the battery 100 further includes an outer insulating film, which is disposed on a side of the metal shell assembly facing away from the pole core assembly 1 , and the outer insulating film covers the outer periphery of the metal shell assembly.

[0080] The outer insulating film completely covers the outer periphery of the metal housing, preventing short circuits and providing insulation while also protecting the metal housing components. As shown in Figure 1 , the outer insulating film includes a first outer insulating film 401 and a second outer insulating film 402. The first outer insulating film 401 covers the outer periphery of the first metal housing 301, while the second outer insulating film 402 covers the outer periphery of the second metal housing 302.

[0081] As shown in Figure 1 , the structures of the first outer insulating film 401 and the second outer insulating film 402 are the same as those of the first metal shell 301 and the second metal shell 302. It should be noted that the structures of the first outer insulating film 401 and the second outer insulating film 402 may also be other structures as long as they can completely cover the first metal shell 301 and the second metal shell 302.

[0082] In one embodiment, the outer insulating film is connected to the side of the shell assembly away from the pole core assembly 1 by heat melting.

[0083] In one embodiment, the outer insulating film is connected to the side of the cover plate assembly 5 away from the pole core assembly 1 by hot melting.

[0084] The outer insulating film is connected to the cover plate assembly 5 by heat-melting the outer insulating film with the injection-molded part of the cover plate assembly 5 .

[0085] In one embodiment, one side of the outer insulating film and the side of the cap plate assembly 5 away from the pole core assembly 1 are on the same plane.

[0086] In one embodiment, as shown in Figures 4-6, a welding area 6 is provided on the welding skirt 303, and sealing welding is performed in the welding area 6 to form a weld layer 601. The welding area 6 is also provided with a film layer 602, and the film layer 602 is provided on the weld layer 601, and the film layer 602 completely covers the weld.

[0087] The film layer 602 may be provided by coating, spot coating, or other methods, which are not limited in this application. The film layer 602 completely covers the weld and has the following functions: on the one hand, it protects the weld point and provides mechanical protection. If an external force acts on the weld, the external force will first act on the film layer 602 and then on the weld layer 601, thereby protecting the weld layer 601. On the other hand, it provides a double seal for the weld area. The weld layer 601 is obtained by welding the first metal shell 301 and the second metal shell 302 to achieve a sealing effect. The film layer 602 seals the weld layer 601 to prevent leakage and also provides a sealing effect. Without the film layer 602, the weld cannot be protected, which reduces the sealing performance of the weld layer 601.

[0088] In one embodiment, as shown in FIG1 , the x-direction is the length direction of the battery 100, the y-direction is the width direction of the battery 100, and the z-direction is the height direction of the battery 100. In the x-direction, the first cover plate assembly and the second cover plate assembly are disposed on either side of the metal shell assembly. The distance between the end of the straight segment 5021 of the first cover plate assembly away from the main body 501 and the end of the weld skirt 303 parallel to the x-direction away from the pole core assembly is 5 to 80 mm; the distance between the end of the straight segment 5021 of the second cover plate assembly away from the main body 501 and the end of the weld skirt 303 parallel to the x-direction away from the pole core assembly is 5 to 80 mm. This distance range allows for the transition between the cover plate assembly 5 and the metal shell assembly while also meeting the overall space requirements of the battery 100.

[0089] As shown in Figures 7 to 9, the inner insulating film includes two connectors 207, a first insulating film 203, two second insulating films 204, a third insulating film 205, and two fourth insulating films 206. In this embodiment, the first insulating film 203 and the second insulating film 204 are an integral and preformed structure, while the third insulating film 205 and the two fourth insulating films 206 are an integral and preformed structure. During assembly, only the first insulating film 203 and the third insulating film 205 need to be bonded together using the connector 207. This has the advantage of a high assembly rate.

[0090] The first insulating film 203 is provided with a preformed first cavity, and the second insulating film 204 is provided with a preformed first groove, and the first cavity is connected to the first groove. The third insulating film 205 is provided with a preformed second cavity 2051, and the fourth insulating film 206 is provided with a preformed second groove, and the second cavity 2051 is connected to the second groove. The first cavity and the second cavity 2051 are arranged opposite to each other, and the side walls of the first insulating film 203 and the side walls of the third insulating film 205 are in contact to form a first inner cavity 91 for placing the pole core assembly 1. The first groove and the second groove are arranged opposite to each other, and the two second insulating films 204 and the two fourth insulating films 206 correspond one to one, and the side walls of the second insulating film 204 and the side walls of the corresponding fourth insulating film 206 are in contact to form a second inner cavity 92 for placing a cover plate assembly.

[0091] The second insulating film 204 and the fourth insulating film 206 are welded to the injection molded part 7 of the cover assembly. The connecting member 207 is used to connect the first insulating film 203 and the third insulating film 205.

[0092] Since the cover plate assembly protrudes from the combined movement, the traditional insulating film cannot provide insulating protection for the cover plate assembly. In this application, a second insulating film 204 and a fourth insulating film 206 are arranged relative to each other, so that the first groove and the second groove are arranged relative to each other, and the side wall of the second insulating film 204 and the side wall of the fourth insulating film 206 are in contact with each other, and finally a second inner cavity 92 for placing the cover plate assembly is formed. The first inner cavity 91 is formed by the first insulating film 203 and the third insulating film 205. The second inner cavity 92 is connected to the first inner cavity. The two second inner cavities 92 in this application respectively insulate and protect the two cover plate assemblies, and the first inner cavity 91 insulates and protects the pole core assembly 1. Compared with the prior art, the inner insulating film in this application can simultaneously insulate and protect the pole core assembly 1 and the cover plate assembly.

[0093] In this embodiment, the inner wall of the first groove fits a portion of the outer surface of the injection molded part 7 of the cover plate assembly, and the bottom wall and side walls of the first groove are in a smooth transition to accommodate the smooth transition of the outer surface of the injection molded part 7 of the cover plate assembly. The inner wall of the second groove fits another portion of the outer surface of the injection molded part 7 of the cover plate assembly, and the bottom wall and side walls of the second groove are in a smooth transition to accommodate the smooth transition of the outer surface of the injection molded part 7 of the cover plate assembly. The inner wall of the first concave cavity fits a portion of the outer surface of the pole core assembly 1, and the bottom wall and side walls of the first concave cavity are in a smooth transition to accommodate the smooth transition of the outer surface of the pole core assembly 1. The inner wall of the second concave cavity 2051 fits another portion of the outer surface of the pole core assembly 1, and the bottom wall and side walls of the second concave cavity 2051 are in a smooth transition to accommodate the smooth transition of the outer surface of the pole core assembly 1.

[0094] In this embodiment, the first insulating film 203, the second insulating film 204, the third insulating film 205, and the fourth insulating film 206 are each subjected to a smooth transition process at the bends of the film bodies. The smooth transition of the first insulating film 203 and the third insulating film 205 is adapted to the smooth transition of the bends at the outer surface of the pole core assembly 1, thereby improving their fit to the pole core assembly 1. Similarly, the second insulating film 204 and the fourth insulating film 206 are improved to fit the outer surface of the cover plate assembly, thereby enabling the inner insulating film to maintain the effect of fitting to the pole core assembly 1 or the cover plate assembly.

[0095] In this embodiment, the first insulating film 203, the second insulating film 204, the third insulating film 205, and the fourth insulating film 206 are made of the same material. The first insulating film 203 is made of one of PP, PE, and PET. Regardless of which material is used, all of them have an insulating effect and are easily available at low cost.

[0096] In this embodiment, the connector 207 is a tape. One side of the tape is bonded to the sidewall of the first insulating film 203, and the other side of the tape is bonded to the sidewall of the third insulating film 205. The tape can be an insulating tape or an adhesive tape. The tape stably connects the first insulating film 203 and the third insulating film 205 to form a stable first inner cavity 91, thereby reducing the possibility of separation between the first insulating film 203 and the third insulating film 205 and facilitating assembly in the next step.

[0097] In this embodiment, the thickness of the first insulating film 203, the second insulating film 204, the third insulating film 205, and the fourth insulating film 206 are all 0.05-0.3 mm. Preferably, the thickness of the first insulating film 203 is 0.1 mm, the thickness of the second insulating film 204 is 0.1 mm, the thickness of the third insulating film 205 is 0.1 mm, and the thickness of the fourth insulating film 206 is 0.1 mm. In order to minimize the thickness of the battery 100 as much as possible, the optimal thickness of the inner insulating film in this embodiment is 0.1 mm. The thickness of the inner insulating film in this embodiment is designed to be extremely thin, which does not excessively increase the thickness of the battery 100, and reduces the impact of thickness while ensuring the insulation effect.

[0098] 10 , in some embodiments, the present application further provides a battery 100, comprising two cover plate assemblies, a pole core assembly 1, a first metal shell 301, a second metal shell 302, and the aforementioned inner insulating film. The two cover plate assemblies and the pole core assembly 1 are connected to form a battery cell. The first insulating film 203 and the third insulating film 205 wrap the pole core assembly 1, and the second insulating film 204 and the fourth insulating film 206 wrap the injection molded part 7 and the pole 7 of the cover plate assembly. The first insulating film 203, the second insulating film 204, the fourth insulating film 206, and the third insulating film 205 form a cavity for accommodating the battery cell.

[0099] The first metal shell 301 and the second metal shell 302 are positioned opposite each other and welded together to form a cavity for accommodating the battery cell and the inner insulating film. The cavity formed by the first metal shell 301 and the second metal shell 302 is used to accommodate the assembled battery cell and the inner insulating film. The inner insulating film isolates the first metal shell 301 from the battery cell and also isolates the second metal shell 302 from the battery cell.

[0100] In this embodiment, the two cover plate assemblies are respectively arranged on opposite sides of the pole core assembly 1, and the two second insulating films 204 are respectively arranged on opposite sides of the first insulating film 203, and the first insulating film 203 and the second insulating film 204 are integrally formed. The first insulating film 203 and the second insulating film 204 in this embodiment can be formed by blow molding a piece of insulating film, and of course, can also be formed by vacuum molding or injection molding a piece of insulating film. The two fourth insulating films 206 are respectively arranged on opposite sides of the third insulating film 205, and the fourth insulating film 206 and the third insulating film 205 are integrally formed. Similarly, the fourth insulating film 206 and the third insulating film 205 can be formed by blow molding, injection molding, or vacuum molding. The above manufacturing methods are all mature technologies, easy to process and manufacture, and have low manufacturing costs.

[0101] 11 , in this embodiment, the cover plate assembly 5 includes a cover plate member 6, an injection molded part 7, and a pole 7. The injection molded part 7 includes a first ring body 71, a second ring body 72, and a third ring body 73. One axial end of the first ring body 71 is connected to one axial end of the second ring body 72, and the other axial end of the second ring body 72 is connected to the third ring body 73. The inner rings of the first, second, and third ring bodies 71, 72, and 73 are of the same size. The outer ring of the second ring body 72 is formed by proportionally reducing the outer ring of the first ring body 71. The outer ring of the third ring body 73 is formed by proportionally reducing the outer ring of the first ring body 71. The outer ring of the second ring body 72 is smaller than the outer ring of the third ring body 73.

[0102] The pole 7 passes through the inner ring of the third ring body 73 and into the inner ring of the first ring body 71. One end of the pole 7 is flush with the end face of the first ring body 71 facing away from the third ring body 73. The other end of the pole 7 is connected to the pole core assembly 1. The cover 6 is sleeved over the second ring body 72, with its orthographic projection on the first ring body 71 located within the outer contour of the first ring body 71. The second insulating film 204 and the fourth insulating film 206 are welded to the third ring body 73.

[0103] In this embodiment, the second insulating film 204 and the fourth insulating film 206 are fixed to the third ring body 73 by hot melting, and do not need to completely cover the cover assembly. They can achieve insulation with the outer shell formed by the first metal shell 301 and the second metal shell 302 without affecting the electrical connection between the cover assembly and the outside world, thereby avoiding the occurrence of short circuit.

[0104] In some embodiments, the present application also provides a battery 100, which differs from the above-mentioned embodiments in that, in this embodiment, one end of the pole 7 protrudes from the end face of the first ring body 71 away from the third ring body 73. In this application, one end of the pole 7 can be selected according to actual needs to protrude from the end face of the first ring body 71 in a direction away from the third ring body 73. The pole 7 in this embodiment adopts a setting of protruding from the first ring body 71.

[0105] As shown in Figures 12 to 14, the outer insulating film includes a fifth insulating film 403, a sixth insulating film 404, a seventh insulating film 405, and an eighth insulating film 406. The fifth insulating film 403 and the sixth insulating film 404 are integrally formed, with the sixth insulating film 404 disposed on the outer edge of the fifth insulating film 403. The seventh insulating film 405 and the eighth insulating film 406 are integrally formed, with the eighth insulating film 406 disposed on the outer edge of the seventh insulating film 405. The seventh insulating film 405 and the fifth insulating film 403 are disposed opposite each other, while the sixth insulating film 404 and the eighth insulating film 406 are disposed opposite each other. A preformed first cavity is provided on the fifth insulating film 403, and a preformed second cavity is provided on the seventh insulating film 405. The first cavity and the second cavity are disposed opposite each other and connected to each other to accommodate the battery cell casing. The sixth insulating film 404 is provided with a preformed third groove 4041, and the eighth insulating film 406 is provided with a preformed fourth groove 4061. The third groove 4041 and the fourth groove 4061 are arranged opposite each other and connected to each other to accommodate the cover housing. The sixth insulating film 404 and the eighth insulating film 406 are connected to each other. The inner wall of the third groove 4041 away from the fifth insulating film 403 is connected to the injection molded part 504 of the cover assembly 5, and the inner wall of the fourth groove 4061 away from the seventh insulating film 405 is connected to the injection molded part 504 of the cover assembly 5.

[0106] That is, a portion of the sixth insulating film 404 of this embodiment is in contact with a portion of the eighth insulating film 406, and another portion of the sixth insulating film 404 and another portion of the eighth insulating film 406 are not in contact due to the presence of the third groove 4041 and the fourth groove. The sixth insulating film 404 and the eighth insulating film 406 that are in contact are connected by hot melt, and the portions that are not in contact are respectively welded to the outer surface of the cover assembly 5.

[0107] In this embodiment, the sixth and eighth insulating films 404 and 406 of the outer insulating film are used to insulate and protect the cover plate housing corresponding to the cover plate assembly 5 of the protruding pole core assembly 1, while the fifth and seventh insulating films 403 and 405 are used to insulate and protect the inner core housing. Compared to the prior art, the outer insulating film insulates the outer wall of the battery of this type, such as the cover plate assembly 5 protruding pole core assembly 1, preventing short circuits between the housings of multiple assembled batteries. In addition, the outer insulating film in this application also plays a role in protecting the housing to a certain extent, reducing damage to the housing due to scratches and friction during transportation.

[0108] Moreover, the first cavity, the second cavity, the third groove 4041 and the fourth groove 4061 in the present application are all pre-formed, and the assemblers do not need to manually adjust, cut or bend the outer insulating film when applying the outer insulating film. They only need to be simply put on the outside of the battery shell, which is convenient for the assemblers to process and has high assembly efficiency.

[0109] In this embodiment, the sides of the sixth insulating film 404 and the eighth insulating film 406 that are close to each other are respectively welded to the injection molded part 504 of the cover plate assembly 5, and the width of the weld is 2 mm from the outer edge of the sixth insulating film 404 to the inner edge. The sixth insulating film 404 and the eighth insulating film 406 are welded, and the weld width is 2 mm from the outer edge of the sixth insulating film 404 to the inner edge. In short, in this embodiment, the 2 mm hot melt zone of the circumferential outer edge of the outer insulating film is hot-melted to the sixth insulating film 404 and the eighth insulating film 406 that are arranged above and in contact with each other. The sixth insulating film 404 and the eighth insulating film 406 that seal the cover plate assembly 5 are directly hot-melted to the cover plate assembly 5, thereby connecting the outer wall of the battery. The connection method is simple and effective, and the insulation effect is excellent.

[0110] In this embodiment, the fifth insulating film 403 and the seventh insulating film 405 have the same structure. The first cavity, the second cavity, the seventh insulating film 405, and the fifth insulating film 403 are all square in shape. The sixth insulating film 404 surrounds the four sides of the fifth insulating film 403, and the eighth insulating film 406 surrounds the four sides of the seventh insulating film 405. Of course, in other embodiments, the first cavity, the second cavity, the seventh insulating film 405, and the fifth insulating film 403 are all circular in shape, and the sixth insulating film 404 and the eighth insulating film 406 are annularly disposed around the seventh insulating film 405 and the fifth insulating film 403, respectively. Regardless of the shape of the insulating film, the sixth insulating film 404 and the eighth insulating film 406 connect the fifth insulating film 403 and the seventh insulating film 405.

[0111] In this embodiment, two third grooves 4041 are provided, and the two third grooves 4041 are respectively provided on both sides of the fifth insulating film 403. Two fourth grooves 4061 are provided, and the two fourth grooves 4061 are respectively provided on both sides of the seventh insulating film 405. In this embodiment, the two cover plate assemblies 5 are provided on opposite sides of the pole core assembly 1. The corresponding sixth insulating film 404 and eighth insulating film 406 for insulating and protecting the cover plate assemblies 5 are also provided on opposite sides of the fifth insulating film 403 and the seventh insulating film 405.

[0112] In this embodiment, the fifth insulating film 403, the sixth insulating film 404, the seventh insulating film 405, and the eighth insulating film 406 are made of the same material. The fifth insulating film 403 is made of one of PP, PE, PET, and PC. The outer insulating film in this embodiment has a wide range of material options, allowing manufacturers to choose based on actual needs and cost. Furthermore, the outer insulating film in this embodiment can be made very thin, thereby reducing the thickness of the battery.

[0113] In this embodiment, the inner wall of the third groove 4041 fits a portion of the outer surface of the injection molded part 504 of the cover plate assembly 5, and the bottom wall and side walls of the third groove 4041 transition smoothly to accommodate the smooth outer surface of the injection molded part 504 of the cover plate assembly 5. The inner wall of the third groove 4041 fits another portion of the outer surface of the injection molded part 504 of the cover plate assembly 5, and the bottom wall and side walls of the fourth groove transition smoothly to accommodate the smooth outer surface of the injection molded part 504 of the cover plate assembly 5. The inner wall of the first concave cavity fits a portion of the outer surface of the pole core assembly 1, and the bottom wall and side walls of the first concave cavity transition smoothly to accommodate the smooth outer surface of the pole core assembly 1. The inner wall of the second concave cavity fits another portion of the outer surface of the pole core assembly 1, and the bottom wall and side walls of the second concave cavity transition smoothly to accommodate the smooth outer surface of the pole core assembly 1.

[0114] In this embodiment, since the pole core assembly 1 and the cover plate assembly 5 are both rounded, the corresponding battery housing is also rounded, so that the corresponding portion of the outer insulating film is also rounded. In this way, the outer insulating film is always in contact with the battery housing, avoiding the phenomenon of the outer insulating film being shifted or easily torn by foreign objects due to the lack of close contact between the outer insulating film and the housing, thereby improving the connection strength and stability. In addition, to a certain extent, the outer insulating film that is in contact with the housing is more convenient to assemble and has a more beautiful appearance.

[0115] In this embodiment, the first cavity, the second cavity, the third groove 4041, and the fourth groove 4061 are all preformed, and the preforming process is one of blow molding, vacuum forming, and injection molding. This preforming process is very mature. Compared with manual processing, the outer insulating film preformed by this process has high manufacturing efficiency and uniform and excellent molding effect. It not only facilitates assembly, but also reduces processing costs by utilizing mature technology.

[0116] In this embodiment, the thickness of the fifth insulating film 403 is 0.05-0.3 mm, the thickness of the sixth insulating film 404 is 0.05-0.3 mm, the thickness of the seventh insulating film 405 is 0.05-0.3 mm, and the thickness of the eighth insulating film 406 is 0.05-0.3 mm. Preferably, the thickness of the outer insulating film is 0.1 mm, which minimizes the adverse effects of the overall thickness of the battery while providing insulation protection.

[0117] In some embodiments, with reference to Figures 15 and 16, the present application discloses a battery comprising a cover plate assembly 5, a pole core assembly 1, an outer shell, and an outer insulating film of any of the above items. The cover plate assembly 5 and the pole core assembly 1 are connected to form a battery cell, and the cover plate assembly 5 protrudes from the pole core assembly 1. The outer shell comprises a first metal shell 301 and a second metal shell 302 arranged opposite to each other, the first metal shell 301 and the second metal shell 302 are sealed and connected and enclose a one-way opening accommodating cavity, which is used to accommodate the pole core assembly 1 and the cover plate assembly 5. The combination formed by the first metal shell 301 and the second metal shell 302 for accommodating the pole core assembly 1 is called an inner core shell. Similarly, the combination formed by the first metal shell 301 and the second metal shell 302 for accommodating the cover plate assembly 5 is called a cover plate shell. The outer shell is artificially split into an inner core shell and a cover plate shell. The outer surface of the cover plate assembly 5 is flush with the opening cross-section of the accommodating cavity, and the outer surface of the pole 7 of the cover plate is flush with the outer surface of the opening of the accommodating cavity, which is beautiful and elegant. In this embodiment, the first metal shell 301 and the second metal shell 302 can both be made of aluminum. Aluminum has good heat dissipation capability and can be processed to be very thin, thereby reducing the thickness of the battery.

[0118] The combination of the fifth insulating film 403 and the sixth insulating film 404 wraps the outer surface of the first metal shell 301 , and the combination of the seventh insulating film 405 and the eighth insulating film 406 wraps the outer surface of the second metal shell 302 .

[0119] Referring to Figure 16 , in this embodiment, the cover plate assembly 5 includes a cover plate member 503, an injection molded part 504, and a pole 7. One end of the pole 7 is flush with the top surface of the injection molded part 504, while the other end of the pole 7 extends from the bottom surface of the injection molded part 504 and is connected to the pole core assembly 1. The cover plate member 503 is sleeved over the injection molded part 504, with the end of the injection molded part 504 facing away from the pole core assembly 1 being flush with the outer circumference of the cover plate member 503. The sixth insulating film 404 and the eighth insulating film 406 are welded to the outer circumference of the injection molded part 504 and cover the outer shell corresponding to the end of the pole 7 connected to the pole core assembly 1.

[0120] The above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should be included in the scope of protection of the present application.

Claims

1. A battery, characterized in that: include: A core assembly (1); at least two cover plate assemblies (5), the pole core assembly (1) being connected to the cover plate assemblies (5); A metal shell assembly, comprising a first metal shell (301) and a second metal shell (302), wherein the first metal shell (301) and the second metal shell (302) are sealed and connected, and the first metal shell (301) and the second metal shell (302) are both provided with a receiving groove (304) and a welding skirt (303), the receiving groove (304) of the first metal shell (301) and the receiving groove (304) of the second metal shell (302) are arranged opposite to each other to form a receiving cavity for receiving the pole core assembly (1), the welding skirt (303) of the first metal shell (301) is arranged at the outer periphery of the opening end of the receiving groove (304) of the first metal shell (301), and the second metal shell (302) is provided with a receiving groove (304) and a welding skirt (303) The welding skirt (303) of the body (302) is arranged on the outer periphery of the open end of the receiving groove (304) of the second metal shell (302); the welding skirt (303) of the first metal shell (301) extends from the open end of the receiving groove (304) of the first metal shell (301) in a direction away from the receiving groove (304) of the first metal shell (301); the welding skirt (303) of the first metal shell (301) and the welding skirt (303) of the second metal shell (302) are sealed and welded; the cover plate assembly (5) is welded between the welding skirt (303) of the first metal shell (301) and the welding skirt (303) of the second metal shell (302).

2. The battery according to claim 1, characterized in that The cover plate assembly (5) is further provided with a first metal welding surface and a second metal welding surface, the first metal welding surface being sealed and welded to the welding skirt (303) of the first metal shell (301), and the second metal welding surface being sealed and welded to the welding skirt (303) of the second metal shell (302); Each welding skirt (303) is provided with a groove (305) for accommodating the cover plate assembly (5), and the groove (305) is provided on at least one side of the metal shell assembly.

3. The battery according to claim 2, characterized in that The cover plate assembly (5) comprises a main body (501) and two extensions (502), the main body (501) being arranged between the two extensions (502), and the thickness of the extension (502) gradually decreasing from one end close to the main body (501) in a direction away from the main body (501); The extension portion (502) comprises a transition section (5022) and a straight section (5021), wherein the transition section (5022) is connected between the main body portion (501) and the straight section (5021); The groove (305) comprises a bottom wall (3052) and two side walls (3051), wherein the bottom wall (3052) is arranged between the two side walls (3051), the bottom wall (3052) is sealed and welded to the main body (501), and the side walls (3051) are sealed and welded to the transition section (5022) and the straight section (5021), respectively.

4. The battery according to claim 1, characterized in that The wall thickness of the first metal shell (301) is 0.05 mm to 0.5 mm, and the wall thickness of the second metal shell (302) is 0.05 mm to 0.5 mm; the containing groove (304) is formed by stamping.

5. The battery according to claim 1, characterized in that The battery further comprises an internal insulating film, wherein the internal insulating film is arranged between the pole core component (1) and the metal shell component, and the internal insulating film is coated on the outer periphery of the pole core component (1) and the cover plate component (5).

6. The battery according to claim 5, characterized in that The inner insulating film includes a first insulating film (203), a second insulating film (204), a third insulating film (205) and a fourth insulating film (206); The first insulating film (203) and the second insulating film (204) are integrally formed, the first insulating film (203) is provided with a preformed first cavity, the second insulating film (204) is provided with a preformed first groove (2041), and the first cavity is connected to the first groove (2041); The third insulating film (205) and the fourth insulating film (206) are integrally formed, the third insulating film (205) is provided with a preformed second cavity (2051), the fourth insulating film (206) is provided with a preformed second groove, and the second cavity (2051) is connected to the second groove; The first concave cavity and the second concave cavity (2051) are arranged opposite to each other, and the side wall of the first insulating film (203) and the side wall of the third insulating film (205) are in contact with each other to form a first inner cavity (91) for placing the pole core assembly (1); The first groove (2041) and the second groove are arranged opposite to each other, and the side wall of the second insulating film (204) contacts the side wall of the corresponding fourth insulating film (206) to form a second inner cavity (92) for placing the cover plate assembly (5); The edges of the second insulating film (204) and the fourth insulating film (206) are welded to the injection molded part (504) of the cover plate assembly (5).

7. The battery according to claim 6, characterized in that The inner insulating film further comprises a connector (207) connecting the first insulating film (203) and the second insulating film (204), wherein the connector (207) is located on a side of the first insulating film (203) where the second insulating film (204) is not provided; One side of the width of the connecting member (207) is fixed to the side wall of the first insulating film (203), and the other side of the width of the connecting member (207) is fixed to the side wall of the third insulating film (205).

8. The battery according to claim 6, characterized in that The inner wall of the first groove (2041) fits a portion of the outer surface of the injection molded part (504) of the cover plate assembly (5), and the bottom wall and the side wall of the first groove (2041) are smoothly transitioned to adapt to the smooth outer surface of the injection molded part (504) of the cover plate assembly (5); The inner wall of the first groove (2041) fits against another part of the outer surface of the injection molded part (504) of the cover plate assembly (5), and the bottom wall and the side wall of the second groove are smoothly transitioned to adapt to the smooth outer surface of the injection molded part (504) of the cover plate assembly (5); The inner wall of the first concave cavity fits the outer surface of a portion of the pole core assembly (1), and the bottom wall and the side wall of the first concave cavity are smoothly transitioned to adapt to the smooth outer surface of the pole core assembly (1); The inner wall of the second cavity (2051) fits the outer surface of another part of the pole core assembly (1), and the bottom wall and the side wall of the second cavity (2051) are smoothly transitioned to adapt to the smooth outer surface of the pole core assembly (1); The first concave cavity, the second concave cavity (2051), the first groove (2041) and the second groove are all formed by pre-molding, and the pre-molding is one of blow molding, vacuum molding and injection molding.

9. The battery according to claim 6, characterized in that The first insulating film (203), the second insulating film (204), the third insulating film (205) and the fourth insulating film (206) are made of the same material, and the first insulating film (203) is one of PP, PE and PET; The thickness of the first insulating film (203) is 0.05-0.3 mm, the thickness of the second insulating film (204) is 0.05-0.3 mm, the thickness of the third insulating film (205) is 0.05-0.3 mm, and the thickness of the fourth insulating film (206) is 0.05-0.3 mm.

10. The battery according to claim 1, characterized in that The battery further comprises an outer insulating film, which is arranged on a side of the metal shell component away from the pole core component (1), and the outer insulating film covers the outer periphery of the metal shell component.

11. The battery according to claim 10, characterized in that The outer insulating film includes a fifth insulating film (403), a sixth insulating film (404), a seventh insulating film (405) and an eighth insulating film (406); The fifth insulating film (403) and the sixth insulating film (404) are integrally formed, and the sixth insulating film (404) is arranged on the outer edge of the fifth insulating film (403); the seventh insulating film (405) and the eighth insulating film (406) are integrally formed, and the eighth insulating film (406) is arranged on the outer edge of the seventh insulating film (405); The seventh insulating film (405) and the fifth insulating film (403) are arranged opposite to each other, and the sixth insulating film (404) and the eighth insulating film (406) are arranged opposite to each other; The fifth insulating film (403) is provided with a third concave cavity (4031), the seventh insulating film (405) is provided with a fourth concave cavity (4051), the third concave cavity (4031) and the fourth concave cavity (4051) are arranged opposite to each other and are interconnected so as to be used for accommodating a battery cell housing; The sixth insulating film (404) is provided with a third groove (4041), the eighth insulating film (406) is provided with a fourth groove (4061), the third groove (4041) and the fourth groove (4061) are arranged opposite to each other and are connected to each other so as to place the cover plate housing; The sixth insulating film (404) and the eighth insulating film (406) are connected at their contact position, the inner wall of the third groove (4041) away from the fifth insulating film (403) is used to connect the injection molded part (504) of the cover plate assembly (5), and the inner wall of the fourth groove (4061) away from the seventh insulating film (405) is used to connect the injection molded part (504) of the cover plate assembly (5).

12. The battery according to claim 11, characterized in that The sides of the sixth insulating film (404) and the eighth insulating film (406) that are close to each other are respectively used for welding to the injection molded part (504) of the cover plate assembly (5); The sixth insulating film (404) and the eighth insulating film (406) are welded.

13. The battery according to claim 11, characterized in that The fifth insulating film (403) and the seventh insulating film (405) are both square-shaped, one side of the fifth insulating film (403) and one side of the seventh insulating film (405) are integrally formed, the sixth insulating film (404) is arranged on the other three sides of the fifth insulating film (403), and the eighth insulating film (406) is arranged on the other three sides of the seventh insulating film (405); or, The sixth insulating film (404) is disposed around the fifth insulating film (403), and the eighth insulating film (406) is disposed around the seventh insulating film (405); The fifth insulating film (403), the sixth insulating film (404), the seventh insulating film (405) and the eighth insulating film (406) are made of the same material, and the fifth insulating film (403) is one of PP, PE, PET and PC; The thickness of the fifth insulating film (403) is 0.05-0.3 mm, the thickness of the sixth insulating film (404) is 0.05-0.3 mm, the thickness of the seventh insulating film (405) is 0.05-0.3 mm, and the thickness of the eighth insulating film (406) is 0.05-0.3 mm.

14. The battery according to claim 11, characterized in that The inner wall of the third groove (4041) fits a portion of the outer surface of the injection molded part (504) of the cover plate assembly (5), and the bottom wall and the side wall of the third groove (4041) are smoothly transitioned to adapt to the smooth outer surface of the injection molded part (504) of the cover plate assembly (5); The inner wall of the fourth groove (4061) fits against another part of the outer surface of the injection molded part (504) of the cover plate assembly (5), and the bottom wall and the side wall of the fourth groove (4061) are smoothly transitioned to adapt to the smooth outer surface of the injection molded part (504) of the cover plate assembly (5); The inner wall of the third concave cavity (4031) fits the outer surface of part of the pole core assembly (1), and the bottom wall and the side wall of the third concave cavity (4031) are smoothly transitioned to adapt to the smooth outer surface of the pole core assembly (1); The inner wall of the fourth concave cavity (4051) is in contact with the outer surface of another part of the pole core assembly (1), and the bottom of the fourth concave cavity (4051) is The wall and the side wall are smoothly transitioned to adapt to the smooth outer surface of the pole core component (1).

15. The battery according to claim 11, characterized in that The third concave cavity (4031), the fourth concave cavity (4051), the third groove (4041) and the fourth groove (4061) are all formed by pre-molding, and the pre-molding is one of blow molding, vacuum molding and injection molding.

Images