Collector plate and preparation method thereof, end cover structure, battery and assembly method of battery

Abstract

The invention relates to the technical field of batteries, and provides a collector plate and a preparation method thereof, an end cover structure, a battery and an assembly method of the battery, the collector plate comprises a collector plate body and a sealing member, the collector plate body comprises a bottom wall and a side wall, the bottom wall and / or the side wall is provided with a plurality of weak areas, and the sealing member is arranged in the weak areas. The sealing piece is nested outside the side wall and outside the part, connected with the side wall, of the bottom wall. According to the embodiment of the invention, the assembly process of the battery can be effectively simplified based on the design of the collector plate, and meanwhile, the overall performance of the battery can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a current collecting plate, an end cover structure, a battery, and a method for preparing the battery. Background Art

[0002] Cylindrical batteries are generally composed of a shell, a battery cell assembly and an end cover structure. The battery cell assembly can undergo electrochemical reactions to generate or store electrical energy. The battery cell assembly is installed in the shell. On the one hand, the end cover structure seals the battery cell assembly in the shell, and on the other hand, it is also necessary to establish an electrical connection with the battery cell assembly in order to release electrical energy or charge the battery.

[0003] In the related art, the end cap structure is generally equipped with a current collecting plate and a cover plate. The current collecting plate needs to be welded to the lug of the battery cell assembly, and the cover plate needs to be welded to the current collecting plate, so as to realize the conduction of the internal circuit of the battery. In the process of connecting the end cap structure to the battery cell assembly and realizing the sealing of the cylindrical battery in the prior art, there are problems such as complicated procedures that increase the difficulty of assembly, and there are also problems that affect the battery performance and battery safety.

[0004] Application Contents

[0005] The present application provides a current collecting plate, an end cover structure and a battery, which can effectively simplify the assembly process of the battery and improve the overall performance of the battery.

[0006] One aspect of the present application provides a current collecting plate, comprising:

[0007] A collector plate body, the collector plate body comprising a bottom wall and a side wall, and a plurality of weak areas are arranged on the bottom wall and / or the side wall;

[0008] and a sealing member, wherein the sealing member is nested on the outside of the side wall and on the outside of a portion of the bottom wall connected to the side wall.

[0009] The current collecting tray in the embodiment of the present application includes a current collecting tray body and a sealing member. Structurally, the current collecting tray body includes a bottom wall and a side wall, and the sealing member is nested on the side wall and a part of the bottom wall, so that the structural composition of the current collecting tray is relatively simple and occupies a small space, which can be used as a basis to improve the energy density of the battery. When assembling the battery, the current collecting tray can be directly connected to the battery cell assembly with its bottom wall, and the contact area can be larger, which can increase the flow area and shorten the flow length at the same time, thereby reducing the internal resistance of the battery, thereby ensuring the high-rate charge and discharge capability of the battery; the sealing member is nested on the outside of the side wall and the outside of a part of the bottom wall, and the current collecting tray formed by the integration of the sealing member and the current collecting tray body is connected to the battery cell. After the assembly is installed, there is no need to set up a seal separately. The collecting disc can perform conductive, insulating and sealing functions, and can separate the battery cover and the battery shell, thereby achieving functional unity on the basis of simple structure and simplified assembly process; in addition, by setting multiple weak areas on the collecting disc body, the weak areas are set on the bottom wall and / or the side wall, and the seal is nested on the outside of the side wall and the outside of the bottom wall. The weak areas can change the strength distribution and internal stress distribution of the collecting disc body, so that the collecting disc body and the seal can be formed into a collecting disc by integral injection molding, which can avoid the problem of separation of the seal and the collecting disc body caused by the shrinkage of the seal during injection molding, thereby improving the reliability and strength of the collecting disc.

[0010] In summary, the current collecting plate in the embodiment of the present application, through the integrated design of the current collecting plate body and the seal, when applied to a battery, can improve the overall performance of the battery and also simplify the assembly process of the battery.

[0011] In a possible implementation, the bottom wall includes a welding area and a non-welding area, the welding area is used to be welded to a tab of the battery, and a portion of the sealing member is nested outside the non-welding area.

[0012] In a possible implementation manner, the bottom wall is configured as a planar structure.

[0013] In a possible implementation, the side wall can be bent to form a bent enclosure.

[0014] In a possible implementation, the bottom wall has a bottom wall through hole, and the bottom wall through hole corresponds to the liquid injection hole provided on the cover plate.

[0015] In a possible implementation, the weak area includes at least one of a through hole, a thin sheet, and a film.

[0016] In a possible implementation, the collecting plate body includes an inner side and an outer side, the surface of the sealing member has a plurality of protrusion structures, and the protrusion structures are formed on at least one side of the sealing member facing the inner side.

[0017] In a possible implementation, the protrusion structure includes at least one of a protrusion, a protrusion column, and a protrusion rib.

[0018] A second aspect of the present application provides a method for preparing a current collecting plate, the method comprising:

[0019] Prepare a collector plate body, the collector plate body comprising a bottom wall and a side wall;

[0020] The sealing component is embedded in the outside of the side wall and the outside of the part of the bottom wall connected to the side wall by integral injection molding.

[0021] The preparation method of the current collecting plate in the embodiment of the present application realizes the integration of the current collecting plate body and the sealing member by means of integral injection molding, and the preparation method is simple.

[0022] In a possible implementation, preparing the collecting plate body includes:

[0023] Providing a metal substrate;

[0024] Punching and stretching the metal substrate to form a current collecting plate body blank;

[0025] A weak area is machined on the current collecting plate body blank.

[0026] The third aspect of the present application provides an end cover structure, comprising:

[0027] The collecting plate of the first aspect;

[0028] and a cover plate connected to the collecting plate.

[0029] The end cover structure in the embodiment of the present application is based on the structural shape of the current collecting disk, and the cover plate is easy to be connected to the current collecting disk. For example, the cover plate can be easily connected to the current collecting disk by welding, and this connection method is carried out in the current collecting disk, which can prevent metal dust generated by welding from falling into the battery and causing a short circuit.

[0030] In a possible implementation manner, the side wall of the current collecting plate can be bent to form a bent wrapping body, and the bent wrapping body can wrap around the edge of the cover plate.

[0031] In a possible implementation, the surface of the sealing member has a plurality of protruding structures, and the protruding structures abut against the outer surface of the cover plate.

[0032] In a possible implementation, the bottom wall of the current collecting plate has a bottom wall through hole, and the cover plate is provided with a liquid injection hole, and the liquid injection hole is communicated with the bottom wall through hole.

[0033] In a possible implementation, a liquid injection hole sealing cover is further provided on the cover plate, and the liquid injection hole sealing cover is installed in the liquid injection hole, and the surface of the liquid injection hole that matches with the liquid injection hole sealing cover is designed to be an inclined surface.

[0034] A fourth aspect of the present application provides a battery, comprising:

[0035] A housing having a receiving cavity;

[0036] A battery cell assembly is accommodated in the accommodating cavity, and a pole ear is provided at the end of the battery cell assembly;

[0037] And the end cover structure described in the third aspect, the bottom wall of the current collecting plate in the end cover structure is connected to the pole ear.

[0038] The battery in the embodiment of the present application has the advantages of good overall performance and simple assembly process.

[0039] In a possible implementation, the bottom wall is configured as a planar structure, the pole lug is configured as a planar structure, and there is surface contact between the bottom wall and the pole lug.

[0040] In a possible implementation manner, the end of the shell is bent and covers the edge of the end cover structure.

[0041] In one possible implementation, the housing has a first open end and a second open end, and the end cover structure includes a first end cover structure and a second end cover structure, wherein the first end cover structure is located at the first open end and the second end cover structure is located at the second open end.

[0042] A fifth aspect of the present application provides a battery assembly method, the assembly method comprising:

[0043] Connecting the battery cell assembly to the bottom of the housing;

[0044] Performing a shrinking process on the shell to form a limiting step on the shell;

[0045] Connecting the end cover structure to the battery core assembly and placing it on the limiting step;

[0046] The end of the shell is bent so as to cover the edge of the end cover structure.

[0047] In a possible implementation, placing the end cover structure on the limiting step and connecting it to the battery cell assembly includes:

[0048] Connecting a current collecting plate to the battery cell assembly;

[0049] connecting the cover plate to the collecting plate;

[0050] The top of the side wall of the collecting plate is formed into a flange and covers the edge of the cover plate.

[0051] The assembly method of the battery in the embodiment of the present application only requires placing the battery cell components and the end cover structure in order, and then assembling them through a single shrinking process and a bending process, and the assembly process is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0053] Figure 1 A schematic diagram of the structure of a battery provided according to an embodiment of the present application is shown;

[0054] Figure 2 A cross-sectional view of a battery provided according to an embodiment of the present application is shown;

[0055] Figure 3 Shows Figure 2 A partial enlarged view of the part in the middle A;

[0056] Figure 4 A cross-sectional view of another battery provided according to an embodiment of the present application is shown;

[0057] Figure 5 A schematic structural diagram of an end cover structure provided according to an embodiment of the present application is shown;

[0058] Figure 6 A schematic diagram of an assembly process of a battery provided according to an embodiment of the present application is shown;

[0059] Figure 7 Another schematic diagram of an assembly process of a battery provided according to an embodiment of the present application is shown;

[0060] Figure 8 Shows Figure 2 A partial enlarged view of the part in the middle B;

[0061] Fig. 9 A schematic structural diagram of a current collecting plate provided according to an embodiment of the present application is shown;

[0062] Fig.10 A top view of a current collecting plate provided according to an embodiment of the present application is shown;

[0063] Fig.11 Shows Fig.10 Cross-sectional view along CC direction;

[0064] Fig.12 Shows Fig.11 A partial enlarged view of the part in center D;

[0065] Fig.13 A schematic structural diagram of a current collecting plate body provided in an embodiment of the present application is shown.

[0066] Reference numerals:

[0067] 10-housing; 11-accommodating cavity; 12-first opening end; 13-limiting step; 14-second opening end; 15-bending structure;

[0068] 20-battery core assembly; 21-ear;

[0069] 30-end cover structure; 31-first end cover structure; 32-second end cover structure;

[0070] 100-collecting plate; 101-bottom wall through hole; 102-weak area; 110-collecting plate body; 120-seal; 111-bottom wall; 112-side wall; 113-inner side; 114-outer side; 121-protruding structure; 1111-welding area; 1112-non-welding area; 1121-bent covering body;

[0071] 200-cover plate; 201-liquid injection hole; 202-explosion-proof hole; 210-liquid injection hole sealing assembly; 220-explosion-proof plate; 230-explosion-proof protective film; 211-liquid injection hole sealing cover; 212-sealing nail; 2011-trapezoidal segment; 2012-straight segment. DETAILED DESCRIPTION

[0072] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0073] For cylindrical batteries, generally speaking, after the overall assembly of the cylindrical battery is completed, the sealing of the cylindrical battery needs to be achieved through a sealing process. When designing the relevant structures of the cylindrical battery, it is necessary to consider the possibility of adapting to the sealing process. Therefore, some structures of the cylindrical battery, such as the end cover structure and the outer shell, are designed to be bent and pressed in the sealing process. These structures are in an upright state before the sealing process, and the insulation between the outer shell and the end cover needs to be considered, so that before the sealing process is carried out, a circle of sealing rings needs to be added to the periphery of the end cover structure, and then the outer shell and the sealing ring are wrapped around the outer periphery of the end cover structure through the sealing process to achieve the sealing of the cylindrical battery and the insulation between the outer shell and the end cover.

[0074] In the related art, the end cap structure is generally equipped with a current collecting plate and a cover plate. The current collecting plate needs to be welded to the pole ear of the battery cell assembly, and the cover plate needs to be welded to the current collecting plate, so as to realize the conduction of the internal circuit of the battery. When assembling cylindrical batteries, the rear-end assembly process generally includes the following steps: first, the current collecting plate is extended into the shell and welded to the pole ear of the battery cell assembly, and then the cover plate is installed, and then the cover plate is welded to the current collecting plate by blind welding. In the above process, a seal is also required between the cover plate and the shell, and finally the sealing and insulation are realized after the sealing process.

[0075] In the above process, in order to achieve welding between the cover plate and the current collecting plate, the current collecting plate generally needs to be designed with a protruding structure, and the current collecting plate relies on the protruding structure to achieve welding with the cover plate. In the above assembly process, there are not only problems such as complicated processes that increase the difficulty of assembly, but also problems that affect battery performance and battery safety. For example, due to the use of blind welding, it is easy to cause problems such as cold welding and welding penetration; for example, based on the setting of the protruding structure on the current collecting plate, not only will the flow area be small and the flow length be long, which is easy to cause the internal resistance of the battery to increase, thereby affecting the high-rate charge and discharge capacity of the battery, but the protruding structure will also occupy more internal space of the battery, which will reduce the energy density of the battery; in addition, the welding in the above process needs to be carried out inside the shell, and the metal powder generated during the welding process may fall into the battery cell assembly and cause a short circuit. At the same time, this type of welding requires a large welding energy and is easy to burn the battery cell assembly.

[0076] Based on the above status quo and problems, the present application has redesigned the collecting plate. The collecting plate as a whole is designed to be a disc-shaped structure with an open upper end, which includes a bottom wall and a side wall. At the same time, multiple weak areas are arranged at appropriate positions of the bottom wall and the side wall, and seals are integratedly designed at the bottom wall and the side wall corresponding to the weak areas.

[0077] By designing the current collecting plate as above, on the one hand, the current collecting plate can integrate the insulating sealing performance on the basis of maintaining the original function, so that the current collecting plate can achieve the insulation of the outer shell and the end cover structure while connecting the battery cell assembly; on the other hand, the current collecting plate also has a simpler structure, which can be optimized in terms of reducing the occupied space, increasing the contact area with the battery cell assembly and simplifying the preparation process.

[0078] Figure 1 A schematic diagram of the structure of a battery provided according to an embodiment of the present application is shown; Figure 2 A cross-sectional view of a battery provided according to an embodiment of the present application is shown; Figure 3 Shows Figure 2 A partial enlarged view of the part in the middle A; Figure 4 A cross-sectional view of another battery provided according to an embodiment of the present application is shown; Figure 5 A structural schematic diagram of an end cover structure provided according to an embodiment of the present application is shown.

[0079] Based on the above design and advantages of the collector plate, please refer to Figures 1 to 3 An embodiment of the present application provides a battery, which includes a housing 10, a battery cell assembly 20 and an end cover structure 30.

[0080] The housing 10 is a protective shell of the battery, and can protect other components of the battery, such as the battery cell assembly 20. The housing 10 has a receiving cavity 11, and the battery cell assembly 20 is received in the receiving cavity 11. The housing 10 can be made of aluminum, aluminum alloy or stainless steel. The housing 10 can be designed as a cylindrical tube structure, such as Figure 2 As shown, it can be open at one end, such as Figure 4 As shown, the housing 10 may also be open at both ends.

[0081] In other possible embodiments, the housing 10 may also be designed in other structural forms, such as a square shape.

[0082] The cell assembly 20 is the core component of the battery, which includes structures such as the positive electrode, the negative electrode, and the diaphragm, and also includes an electrolyte. The conversion of chemical energy and electrical energy is achieved through the chemical reaction of the electrolyte on the positive electrode and the negative electrode. In order to achieve the connection between the cell assembly 20 and the end cover structure 30, the cell assembly 20 is also formed with a pole ear 21 at its end. The end cover structure 30 needs to be connected to the pole ear 21, so that the electrical energy of the cell assembly 20 can be guided to the end cover structure 30, and of course, the external electrical energy can also be guided from the end cover structure 30 to the cell assembly 20.

[0083] Please refer to Figure 5The end cap structure 30 includes the above-mentioned current collecting disk 100 and a cover plate 200 that can be connected to the current collecting disk 100, so that the end cap structure 30 is based on the structural shape of the current collecting disk 100, for example, based on the disc-shaped structure of the current collecting disk 100, so that the cover plate 200 is easy to be connected to the current collecting disk 100. For example, the cover plate 200 can be easily connected to the current collecting disk 100 by welding, and this connection method is performed in the current collecting disk 100, which can prevent metal dust generated by welding from falling into the battery and causing a short circuit.

[0084] It can be understood that, compared with the traditional battery, the battery in the embodiment of the present application has undergone structural changes, which are mainly reflected in the end cap structure 30, the battery cell assembly 20, and the connection between the end cap structure 30 and the battery cell assembly 20. For the battery cell assembly 20, due to the change in the structure of the current collecting plate 100 in the end cap structure 30, in order to achieve the connection with the current collecting plate 100, the pole ear 21 of the battery cell assembly 20 needs to be changed accordingly. For example, the current collecting plate 100 in the embodiment of the present application is designed with a bottom wall, and the bottom wall can have various shapes, for example, the bottom wall can be designed as a planar structure. At this time, in order to achieve better connection, the pole ear 21 can also be designed as a planar structure, and a surface contact can be formed between the bottom wall and the pole ear 21, so that the bottom wall can be connected to the pole ear 21 with a larger contact area, which can increase the flow area and shorten the flow length, thereby reducing the internal resistance of the battery, thereby ensuring the high-rate charge and discharge capability of the battery.

[0085] In the embodiment of the present application, the battery has the advantages of good overall performance and simple assembly process based on the design of the end cover structure 30, the design of the pole ear 21 in the battery cell assembly 20, and the connection design between the end cover structure 30 and the pole ear 21.

[0086] For a battery, there are many factors that affect its overall performance. In the embodiments of the present application, the overall performance of the battery can be improved by optimizing some of the factors. For example, for a battery, the occupation of its internal space has a great influence on the energy density of the battery. The collector plate 100 in the end cover structure 30 of the present application has a simpler structure, which can reduce the occupation of the internal space of the battery, thereby improving the energy density of the battery; for another example, the flow area and flow length of the current will affect the charge and discharge capacity of the battery. The structural design of the bottom wall and side wall of the collector plate 100 in the end cover structure 30 of the present application, the bottom wall can be connected to the battery cell assembly 20, which can increase the flow area and shorten the flow length; for another example, the seal is integrated on the collector plate 100, which can achieve the unity of conductive connection, insulation and sealing; in addition, combined with the connection method between the above-mentioned cover plate 200 and the collector plate 100, it can prevent the risk of short circuit and the like in the battery.

[0087] For a battery, the assembly process depends on the number and complexity of the structural components. In the embodiment of the present application, since the end cover structure 30 in the battery is simplified, the purpose of simplifying the battery assembly can be achieved. Figure 2 and Figure 4 The structural composition and assembly process of the two batteries are described. In the following two batteries, except that the outer shell 10 has a different structure, the other components can be designed to have the same structure.

[0088] Please refer to Figure 2 The shell 10 of the first battery has a first open end 12, which is at the upper end of the shell 10. The battery cell assembly 20 is arranged in the shell 10. The end cover structure 30 is connected to the first open end 12 and connected to the battery cell assembly 20. The shell 10 can be bent at the first open end 12 and cover the edge of the end cover structure 30. This covering design can effectively increase the contact area between the shell 10 and the end cover structure 30, which is beneficial to improving the sealing effect.

[0089] When assembling the battery, the following assembly methods can be used:

[0090] S10, connecting the battery cell assembly 20 to the bottom of the housing 10;

[0091] In this step, it can be understood that the battery cell assembly 20 needs to be assembled into a structural unit, and then the battery cell assembly 20 is integrally connected to the bottom of the housing 10. Figure 2 In the battery shown, the bottom of the housing 10 corresponds to the lower end of the housing 10, and a lead sheet (not shown in the figure) is provided at the bottom of the housing 10, through which one end of the battery cell assembly 20 can be welded to the bottom of the housing 10. In this step S10, it is mainly used to form the negative electrode of the battery, that is, after the battery cell assembly 20 is connected to the bottom of the housing 10, the bottom part of the housing 10 forms the negative electrode of the battery.

[0092] S20, performing a shrinking process on the outer shell 10 to form a limiting step 13 on the outer shell 10;

[0093] In this step, the shrinking process refers to shrinking certain parts of the shell 10 by stamping or extrusion to form a limiting step 13. It can be understood that the shrinking process is performed near the upper end of the shell 10, and its purpose is to support the end cover structure 30 after the end cover structure 30 enters the shell 10. Combined with the above, the end cover structure 30 includes a cover plate 200 and a current collecting plate 100 in a disc-shaped structure, so the end cover structure 30 is also a disc-shaped structure as a whole. After it is placed in the shell 10, the end cover structure 30 in a disc-shaped structure can be supported on the limiting step 13.

[0094] S30, placing the end cover structure 30 on the limiting step 13 and connecting it to the battery cell assembly 20;

[0095] The limiting step 13 can form a preliminary positioning for the end cover structure 30. The connection between the end cover structure 30 and the battery cell assembly 20 can be achieved by welding, such as pulse welding. After the limiting step 13 forms the above-mentioned preliminary positioning for the end cover structure 30, the end cover structure 30 is not easy to shake during the welding process, which can improve the welding accuracy and effect.

[0096] S40 , bend the end of the housing 10 to cover the edge of the end cover structure 30 .

[0097] After step S30, the end cap structure 30 is welded to the tab 21, and the battery can be sealed by bending the end of the shell 10. It is understandable that the shell 10 can be bent by a conventional sealing process or other processes.

[0098] Figure 6 A schematic diagram of an assembly process of a battery provided according to an embodiment of the present application is shown; Figure 7 Another schematic diagram of an assembly process of a battery provided according to an embodiment of the present application is shown.

[0099] Please refer to Figure 6 and Figure 7 To implement the above step S30, the following assembly method may be used:

[0100] S31, connecting the current collecting plate 100 to the battery cell assembly 20;

[0101] Based on the design of the collector plate 100, the bottom wall of the collector plate 100 can be connected to the battery cell assembly 20. In combination with the above, the bottom wall can be connected to the tab 21 of the battery cell assembly 20. This connection can be performed by pulse welding or the like.

[0102] S32, connecting the cover plate 200 to the collecting plate 100;

[0103] After the current collecting plate 100 is connected to the battery cell assembly 20, the current collecting plate 100 has an opening on the top thereof. The function of the cover plate 200 is to close the opening. To improve the closing effect, the cover plate 200 can be connected to the side wall of the current collecting plate 100 by welding. In addition, the cover plate 200 can be connected to the top of the side wall, or a certain distance can be left from the top. In the case where a certain distance is left between the cover plate 200 and the top, the following steps can also be performed on the side wall.

[0104] S33 , forming a flange on the top of the side wall of the current collecting plate 100 and covering the edge of the cover plate 200 .

[0105] After the cover plate 200 is connected to the current collecting plate 100, the side wall will extend beyond the cover plate 200 and form a portion that can be bent above the cover plate 200. In this step, the connection effect between the cover plate 200 and the current collecting plate 100 can be improved by bending and flanging the portion and covering the edge of the cover plate 200, which can increase the contact area between the two and improve the current flow capacity. On the other hand, since a seal is integrated on the side wall, a good insulation effect can also be achieved by designing the side wall to be flanging and covering the edge of the cover plate 200.

[0106] It should be noted that the main purpose of step S33 is to achieve the covering effect of the collecting plate 100 on the cover plate 200. It can be understood that this step can be integrated into the aforementioned step S40, that is, the end of the shell 10 and the top of the side wall of the collecting plate 100 can be bent at the same time so that they are simultaneously covered on the edge of the cover plate 200.

[0107] It can be seen from the above-mentioned battery assembly method that when assembling the battery, it is only necessary to put the battery cell assembly 20 and the end cover structure 30 in order, and then assemble them through the single shrinking process and bending process, and the assembly process is simple.

[0108] Please refer to Figure 4 The shell 10 of the second battery has a first open end 12 and a second open end 14, the first open end 12 is at the upper end of the shell 10, and the second open end 14 is at the lower end of the shell 10. The battery cell assembly 20 is arranged in the shell 10, and a first end cover structure 31 is connected at the first open end 12, and a second end cover structure 32 is connected at the second open end 14. The first end cover structure 31 and the second end cover structure 32 are respectively connected to the two ends of the battery cell assembly 20. The shell 10 adopts a covering design at both the first open end 12 and the second open end 14, which can effectively increase the contact area between the shell 10 and the first end cover structure 31 and the second end cover structure 32, which is beneficial to improving the sealing effect.

[0109] Different from the battery having only the first open end 12 in the above-mentioned second type of battery, both ends of the battery are provided with end cap structures 30 and both adopt the shrinking process, so the assembly method of the battery is different. When assembling the second type of battery, the following assembly method can be adopted:

[0110] S100, performing a shrinking process on one end of the housing 10 to form a limiting step 13 at the one end of the housing 10;

[0111] For ease of understanding, the upper end of the housing 10 may be subjected to a shrinking process to form a limiting step 13 at the upper end. The specific molding method and function of the limiting step 13 may be referred to above and will not be described in detail.

[0112] S200, placing the first end cover structure 31 on the limiting step 13 and connecting it to the battery cell assembly 20;

[0113] The first end cap structure 31 is the same as the end cap structure 30 mentioned above, and will not be described in detail. The way in which the first end cap structure 31 is connected to the battery cell assembly 20 can be referred to above, and will not be described in detail.

[0114] S300 , bend one end of the housing 10 to cover the edge of the first end cover structure 31 .

[0115] In conjunction with the foregoing, “one end of the housing 10 ” refers to the upper end of the housing 10 , and its bending process and function can be referred to in the foregoing, and will not be described in detail.

[0116] S400 , repeat the above steps to connect the second end cover structure 32 to the other end of the housing 10 .

[0117] The second battery adopts a structural form in which end cover structures 30 are provided at both ends. Based on the performance advantages of the end cover structures 30, the comprehensive performance of the second battery is further improved.

[0118] The above is a detailed description of the assembly method of the battery in the embodiment of the present application. It can be understood that when the battery is formed according to the above assembly method, the shapes of some components of the battery will change before and after assembly, such as the collecting plate 100, the shell 10, etc.

[0119] For the collector plate 100, the change in its shape is mainly reflected in the bending, as shown in the above step S33. After the top of the side wall of the collector plate 100 is formed with a flange, the flange will be covered on the edge of the cover plate 200. Therefore, when designing the collector plate 100, please refer to Figure 3 The side wall needs to be designed to be able to be bent and to form a bent wrapping body 1121 after bending, so that the bent wrapping body can wrap around the edge of the cover plate 200.

[0120] It is understandable that the material of the collecting plate 100 can be made of a material that is easy to bend and not easily deformed. At the same time, the collecting plate 100 also needs to have good electrical conductivity. Taking the above into consideration, the collecting plate 100 can be made of materials such as copper or aluminum.

[0121] For the shell 10, the change of its shape is mainly reflected in the shrinking process and bending. The former can refer to 3 and step S20. The shell 10 processed by the shrinking process forms a limiting step 13; the latter can refer to Figure 3 In step S30 , the housing 10 is bent into a bent structure 15 , and the bent structure 15 can be wrapped around the edge of the end cover structure 30 .

[0122] In the examples of this application, please refer to Figure 5 The bottom wall of the collecting plate 100 has a bottom wall through hole 101 , and the cover plate 200 is provided with a liquid injection hole 201 , which is communicated with the bottom wall through hole 101 .

[0123] The end cover structure 30 is connected to the end of the outer shell 10. In the end cover structure 30, a bottom wall through hole 101 is designed on the collecting plate 100, and an injection hole 201 that can be connected to the bottom wall through hole 101 is provided on the cover plate 200, so that the battery can be injected, so that the electrolyte can flow into the battery cell assembly 20 through the injection hole 201 and the bottom wall through hole 101.

[0124] The bottom wall through hole 101 can be opened at the center position of the bottom wall, and the injection hole 201 can be opened at the center position of the cover plate 200. The above-mentioned position design of the bottom wall through hole 101 and the injection hole 201 enables them to align with the battery cell assembly 20, and the electrolyte can quickly enter the battery cell assembly 20 during injection.

[0125] Figure 8 Shows Figure 2 In some embodiments, please refer to Figure 5 and 8 A liquid injection hole sealing component 210 is also provided on the cover plate 200 , and the liquid injection hole sealing component 210 is used to seal the liquid injection hole 201 .

[0126] The injection hole sealing assembly 210 (hereinafter referred to as "sealing assembly") is detachably installed at the injection hole 201, so that the sealing assembly can open and close the injection hole 201. When the injection hole 201 is opened, the injection operation can be performed, and after the injection is completed, the injection hole 201 can be closed.

[0127] The sealing component can be assembled to the cover plate 200 in a plug-in manner or a flip-up manner. Taking the plug-in manner as an example, a rubber plug can be designed, and the sealing of the injection hole 201 is achieved through the elastic deformation of the rubber plug. When the injection hole 201 needs to be opened, the rubber plug can be pulled up by applying external force. When the injection hole 201 needs to be closed, the rubber plug can be inserted into the injection hole 201. Taking the flip-up manner as an example, a flip shaft can be designed on one side of the cover plate 200 located at the injection hole 201, and then the sealing component in the form of a plate structure is connected to the flip shaft. The injection hole 201 can be opened and closed by rotating the sealing component around the flip shaft.

[0128] In some embodiments, please refer to Figure 5 and Figure 8The sealing assembly includes an injection hole sealing cover 211 and a sealing pin 212. The injection hole 201 is designed to include a trapezoidal segment 2011 and a straight segment 2012. The cross-section of the trapezoidal segment 2011 is trapezoidal, and the cross-section of the straight segment 2012 extends along a straight line. The injection hole sealing cover 211 is suitable for fitting in the trapezoidal segment 2011, and the sealing pin 212 is suitable for fitting in the straight segment 2012.

[0129] In the above embodiment, the sealing component constructs a two-layer sealing structure for the injection hole 201, one layer of the sealing structure is realized by the cooperation between the injection hole sealing cover 211 and the trapezoidal segment 2011, and the other layer of the sealing structure is realized by the cooperation between the sealing pin 212 and the straight segment 2012. The sealing component can improve the sealing effect of the injection hole 201.

[0130] In addition, the design of the trapezoidal segment 2011 and the straight segment 2012 of the injection hole 201 can simplify the installation of the sealing assembly. When installing the sealing assembly, the sealing nail 212 can be pressed into the straight segment 2012 first, and the nail cap of the sealing nail 212 can be supported at the intersection of the straight segment 2012 and the trapezoidal segment 2011, and then the injection hole sealing cover 211 is installed in the trapezoidal segment 2011 to complete the installation of the sealing assembly.

[0131] In some specific embodiments, the sealing pin 212 can be made of a soft and elastic material such as rubber, and the injection hole sealing cover 211 can be made of a metal material, so that the sealing assembly has good structural strength as a whole.

[0132] In addition, for the above-mentioned sealing component, an injection channel can be designed inside the sealing pin 212, and the injection channel can be directly connected to the core component 20. When injecting liquid, the injection channel can be exposed by opening or removing the injection hole sealing cover 211, and then the injection equipment can be connected to the injection channel to complete the injection.

[0133] It is understandable that the injection hole sealing cover 211 can be installed on the cover plate 200 in the aforementioned flip-cover manner. Of course, in other embodiments, the injection hole sealing cover 211 can also be installed in the trapezoidal section 2011 by pulling with external force.

[0134] As can be seen from the above content, the trapezoidal section 2011 of the liquid injection hole 201 is matched with the liquid injection hole sealing cover 211, and the surface of the liquid injection hole 201 that matches with the liquid injection hole sealing cover 211 is an inclined surface, and this inclined surface design is conducive to the installation of the liquid injection hole sealing cover 211, and the liquid injection hole sealing cover 211 can fall into the trapezoidal section 2011 along the inclined surface. In addition, the design of the trapezoidal section 2011 can also accommodate residual electrolyte during liquid injection, which can reduce the difficulty of cleaning the electrolyte at the welding position of the liquid injection hole 201.

[0135] In some embodiments, please refer to Figure 5 An explosion-proof structure may also be provided on one side of the injection hole 201. For example, an explosion-proof hole 202 may be provided on one side of the cover plate 200 located at the injection hole 201, and an explosion-proof structure may be installed in the explosion-proof hole 202. The explosion-proof structure may open the explosion-proof hole 202 when the internal temperature of the battery is too high, so that the high-temperature gas inside the battery can be discharged out of the battery in time.

[0136] When setting up an explosion-proof structure, the explosion-proof structure can use an explosion-proof plate 220, and an explosion-proof protective film 230 for protecting the explosion-proof plate 220 can be added above the explosion-proof plate 220. When the battery is in normal use, the explosion-proof protective film 230 is located above the explosion-proof plate 220, which can prevent external dust and some corrosive substances from corroding the explosion-proof plate 220.

[0137] In the case where the explosion-proof structure adopts the explosion-proof disk 220 and the explosion-proof protective membrane 230, the explosion-proof hole 202 can be designed as a stepped hole, and the explosion-proof disk 220 and the explosion-proof protective membrane 230 can be stacked in sequence in the stepped hole.

[0138] The specific types of the explosion-proof disk 220 and the explosion-proof protective film 230 are not limited and can be selected according to specific application scenarios.

[0139] Fig. 9 A schematic structural diagram of a current collecting plate provided according to an embodiment of the present application is shown; Fig.10 A top view of a current collecting plate provided according to an embodiment of the present application is shown; Fig.11 Shows Fig.10 Cross-sectional view along CC direction; Fig.12 Shows Fig.11 A partial enlarged view of the part in center D.

[0140] In the examples of this application, please refer to Figures 9 to 12 The current collecting plate 100 in the embodiment of the present application includes a current collecting plate body 110 and a sealing member 120 .

[0141] The collecting plate body 110 includes the bottom wall 111 and the side wall 112. The bottom wall 111 and / or the side wall 112 are provided with a plurality of weak areas 102. The sealing member 120 is nested outside the side wall 112 and outside a portion of the bottom wall 111 connected to the side wall 112.

[0142] It should be noted here that the weak area 102 refers to a weak area on the collecting plate body 110. Compared with other areas on the collecting plate body 110, the weak area has thin thickness and low strength. Its purpose is to enable the collecting plate body 110 to form a reliable and stable connection with the seal 120.

[0143] It is understandable that the collecting plate 100 needs to be connected to the battery cell assembly 20. The collecting plate body 110 can be made of metal material to play the role of conductivity and strength enhancement. The seal 120 plays the role of sealing and insulation. The seal 120 can be made of rubber and other materials.

[0144] The collecting plate body 110 is based on the combination of the bottom wall 111 and the side wall 112 so that the collecting plate 100 can be roughly in the form of a disc-shaped structure with an opening facing upward. The disc-shaped structure can be connected to the battery cell assembly 20 to guide the current, which is the original function of the collecting plate 100. The design of the sealing member 120 nested in the bottom wall 111 and the side wall 112 enables the collecting plate 100 to have multiple other functions in addition to the above-mentioned original functions.

[0145] The current collecting tray 100 in the embodiment of the present application includes a current collecting tray body 110 and a sealing member 120. Structurally, the current collecting tray body 110 includes a bottom wall 111 and a side wall 112. The sealing member 120 is nested on the side wall 112 and a portion of the bottom wall 111, so that the structure of the current collecting tray 100 is relatively simple and occupies a small space, which can be used as a basis to improve the energy density of the battery. When assembling the battery, the current collecting tray 100 can be directly connected to the battery cell assembly 20 with its bottom wall 111, and the contact area can be larger, which can increase the flow area and shorten the flow length at the same time, thereby reducing the internal resistance of the battery, thereby ensuring the high-rate charge and discharge capability of the battery; the sealing member 120 is nested on the outside of the side wall 112 and the outside of a portion of the bottom wall 111. The current collecting tray 100 formed by the integration of the sealing member 120 and the current collecting tray body 110 is connected to the battery cell assembly 20. After the component 20 is mounted, there is no need to set up a sealing component separately. The current collecting plate 100 can perform conductive, insulating and sealing functions by itself, and can separate the battery cover 200 and the battery shell 10, thereby achieving functional unity on the basis of simple structure and simplified assembly process; in addition, by setting a plurality of weak areas 102 on the current collecting plate body 110, the weak areas 102 are set on the bottom wall 111 and / or the side wall 112, and the sealing component 120 is nested on the outside of the side wall 112 and the outside of the bottom wall 111, the weak areas 102 can change the strength distribution and internal stress distribution of the current collecting plate body 110, so that the current collecting plate body 110 and the sealing component 120 can form the current collecting plate 100 by integral injection molding, which can avoid the problem of separation of the sealing component 120 and the current collecting plate body 110 caused by the shrinkage of the sealing component 120 during injection molding, thereby improving the reliability and strength of the current collecting plate 100.

[0146] The end cap structure 30 and the battery in the above embodiment can adopt the current collecting plate 100. The advantages of the end cap structure 30 and the battery have been introduced in the above embodiment and will not be described in detail here. It can be understood that in addition to the advantages already introduced above, the advantages or characteristics of the current collecting plate 100 can also be added to the above end cap structure 30 and the battery.

[0147] In some embodiments, please refer to Figure 3 , Figure 11 to Figure 12 The bottom wall 111 includes a welding area 1111 and a non-welding area 1112 . The welding area 1111 is used to be welded to the battery tab 21 , and a portion of the seal 120 is nested outside the non-welding area 1112 .

[0148] Therefore, the bottom wall 111 can perform at least two functions, namely, the welding area 1111 is used to achieve connection with the pole ear 21, and the non-welding area 1112 is nested with the seal 120 to achieve insulation sealing between the cover plate 200 and the shell 10 after the side wall 112 is bent.

[0149] In combination with the foregoing, when the bottom wall 111 is specifically designed, it can be designed into a planar structure so that it can form a larger welding area with the pole ear 21, thereby increasing the flow area. After the side wall 112 is bent and wraps the edge of the cover plate 200, the current can flow from the collecting plate 100 to the cover plate 200 in a shorter path, shortening the flow length, thereby reducing the internal resistance of the battery, so that the high-rate charge and discharge capability of the battery can be guaranteed.

[0150] Therefore, it can be appreciated that the design of the weak area 102 on the bottom wall 111 and / or the side wall 112 can not only facilitate the integration of the seal 120 into the collecting plate body 110, but also enable the side wall 112 to be easily bent into a bent enclosure 1121, thereby reducing the overall difficulty of assembling the battery.

[0151] In conjunction with the above, please refer to Fig. 9 A bottom wall through hole 101 is formed on the bottom wall 111. After the cover plate 200 is connected to the collecting plate 100, the bottom wall through hole 101 can be connected to the injection hole 201 on the cover plate 200, so as to facilitate the injection operation of the battery.

[0152] Fig.13 Schematic diagram of the structure of a collector plate body provided in an embodiment of the present application is shown. Fig.13The weak area 102 is a through hole designed on the side wall 112 and / or the bottom wall 111. After the seal 120 is integrated into the side wall 112 and the bottom wall 111 by integral injection molding, based on the design of the through hole, the seal 120 can be filled in the through hole, which can avoid the seal 120 and the collecting plate body 110 from separating due to the temperature drop after the injection molding is completed.

[0153] In some embodiments, the weak area 102 may also be designed as a thin sheet or a film, so that the seal 120 can fit tightly on the weak area 102 .

[0154] In some embodiments, please refer to Figure 3 and Fig.11 , Fig.12 The collecting plate body 110 includes an inner side 113 and an outer side 114 . The surface of the sealing member 120 has a plurality of protruding structures 121 . The protruding structures 121 are formed at least on one side of the sealing member 120 facing the inner side 113 .

[0155] After the cover plate 200 is connected to the current collecting plate 100, the edge of the cover plate 200 can squeeze the protruding structure 121 and cause the protruding structure 121 to deform. When the side wall 112 of the current collecting plate 100 is bent, multiple protruding structures 121 can form multiple seals between the cover plate 200 and the current collecting plate 100, thereby improving the sealing performance of the battery.

[0156] In some specific embodiments, the protrusion structure 121 may include at least one of a protrusion, a protrusion column, and a protrusion rib.

[0157] Based on the structural composition of the current collecting plate 100 introduced above, the embodiment of the present application further provides a preparation method for preparing the current collecting plate 100, and the preparation method can be implemented in the following manner:

[0158] S100, preparing a current collecting plate body 110, wherein the current collecting plate body 110 includes a bottom wall 111 and a side wall 112;

[0159] The specific manufacturing method of the collector plate body 110 is not limited, and it can be manufactured by CNC machining or stamping. It should be understood that the structure of the prepared collector plate body 110 can refer to Fig.13 The collecting plate body 110 needs to include a bottom wall 111 and a side wall 112 , and has a weak area 102 on the bottom wall 111 and the side wall 112 , and the weak area 102 can be a through hole.

[0160] S200 , embed the sealing member 120 on the outside of the side wall 112 and the outside of the portion of the bottom wall 111 connected to the side wall 112 by integral injection molding.

[0161] In this step, it is necessary to select a suitable mold, and in the process of injection molding, it is necessary to reasonably control the injection molding time and temperature and other conditions. In actual operation, the collector plate body 110 prepared in the above steps can be pre-buried in the mold, and then the casting material corresponding to the seal 120 can be poured into the mold. After a certain period of time, the mold can be opened to form the collector plate 100.

[0162] In the above method for preparing the collecting plate 100 , based on the structural shape of the collecting plate body 110 , the sealing member 120 and the collecting plate body 110 are not easily separated, so that the collecting plate 100 has higher structural strength and reliability.

[0163] For the above step S100, in some embodiments, in order to control the cost and simplify the process, the following method can be used:

[0164] S110, providing a metal substrate;

[0165] It is understandable that the metal substrate may be a sheet material having a certain thickness, which can provide a certain processing margin for subsequent processes.

[0166] S120, stamping and stretching the metal substrate to form a current collecting plate body blank;

[0167] The stamping and stretching is mainly to make the current collecting disc body blank have the disc-shaped structure introduced above, so as to form the bottom wall 111 and the side wall 112 of the current collecting disc body 110 .

[0168] S130, processing a weak area 102 on the collector plate body blank.

[0169] It is understandable that when the weak area 102 is a through hole, the through hole can be formed directly by punching; when the weak area 102 is other structures, such as a thin sheet or a film, the collecting plate body blank can be processed and formed by removing material.

[0170] In summary, the entire process of preparing the collecting plate 100 mainly involves a stamping and stretching process and an integrated injection molding process. Both processes are easy to operate and implement, have simple process flows, and can effectively control the manufacturing accuracy of the collecting plate 100.

[0171] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0172] In the description of the present application, it should be understood that the terms "including" and "having" and any variations thereof used in the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0173] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense, for example, it can be a fixed connection, it can also be a detachable connection, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can make the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0174] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. 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 or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A collecting plate (100), characterized in that: include: A current collecting plate body (110), the current collecting plate body (110) comprising a bottom wall (111) and a side wall (112), wherein a plurality of weak areas (102) are provided on the bottom wall (111) and / or the side wall (112); and a sealing member (120) which is nested on the outside of the side wall (112) and on the outside of a portion of the bottom wall (111) connected to the side wall (112).

2. The collecting plate (100) according to claim 1, characterized in that: The bottom wall (111) comprises a welding area (1111) and a non-welding area (1112), wherein the welding area (1111) is used for welding to a battery tab (21), and a portion of the sealing member (120) is nested outside the non-welding area (1112).

3. The collecting plate (100) according to claim 1, characterized in that: The bottom wall (111) is configured as a planar structure.

4. The collecting plate (100) according to claim 1, characterized in that: The side wall (112) can be bent to form a bent enclosure (1121).

5. The collecting plate (100) according to claim 1, characterized in that: The bottom wall (111) has a bottom wall through hole (101), and the bottom wall through hole (101) corresponds to a liquid injection hole (201) provided on the cover plate (200).

6. The collecting plate (100) according to claim 1, characterized in that: The weak area (102) includes at least one of a through hole, a thin sheet and a film.

7. The collecting plate (100) according to claim 1, characterized in that: The collecting plate body (110) comprises an inner side (113) and an outer side (114); the surface of the sealing member (120) has a plurality of protruding structures (121); and the protruding structures (121) are at least formed on one side of the sealing member (120) facing the inner side (113).

8. The collecting plate (100) according to claim 7, characterized in that: The protruding structure (121) comprises at least one of a protruding point, a protruding column and a protruding rib.

9. A method for preparing a current collecting plate (100), used for preparing the current collecting plate (100) according to any one of claims 1 to 8, characterized in that: The preparation method comprises: Prepare a current collecting plate body (110), wherein the current collecting plate body (110) comprises a bottom wall (111) and a side wall (112); The sealing member (120) is embedded in the outside of the side wall (112) and the outside of the portion of the bottom wall (111) connected to the side wall (112) by means of integral injection molding.

10. The method for preparing the collecting plate (100) according to claim 9, characterized in that: The preparation of the collecting plate body (110) comprises: Providing a metal substrate; Punching and stretching the metal substrate to form a current collecting plate (100) body blank; A weak area (102) is machined on the main body blank of the collecting plate (100).

11. The end cap structure (30) is characterized in that: include: The collecting plate (100) according to any one of claims 1 to 8; and a cover plate (200), wherein the cover plate (200) is connected to the collecting plate (100).

12. The end cap structure (30) according to claim 11, characterized in that: The side wall (112) of the current collecting plate (100) can be bent to form a bent wrapping body (1121), and the bent wrapping body can wrap around the edge of the cover plate (200).

13. The end cap structure (30) according to claim 12, characterized in that: The surface of the sealing member (120) has a plurality of protruding structures (121), and the protruding structures (121) abut against the outer surface of the cover plate (200).

14. The end cap structure (30) according to claim 11, characterized in that: The bottom wall (111) of the current collecting plate (100) has a bottom wall through hole (101), and the cover plate (200) is provided with a liquid injection hole (201), and the liquid injection hole (201) is connected to the bottom wall through hole (101).

15. The end cap structure (30) according to claim 14, characterized in that: The cover plate (200) is also provided with a liquid injection hole sealing cover (211), the liquid injection hole sealing cover (211) is installed in the liquid injection hole (201), and the surface of the liquid injection hole (201) that matches the liquid injection hole sealing cover (211) is designed to be an inclined surface.

16. A battery, characterized in that include: A housing (10) having a receiving cavity (11); A battery cell assembly (20) is accommodated in the accommodation cavity (11), and a pole ear (21) is provided at the end of the battery cell assembly (20); And according to the end cover structure (30) according to any one of claims 11 to 15, the bottom wall (111) of the collecting plate (100) in the end cover structure (30) is connected to the pole lug (21).

17. The battery according to claim 16, characterized in that The bottom wall (111) is configured as a planar structure, the pole lug (21) is configured as a planar structure, and the bottom wall (111) and the pole lug (21) are in surface contact.

18. The battery according to claim 16, characterized in that The end of the housing (10) is bent and covers the edge of the end cover structure (30).

19. The battery according to claim 16, characterized in that The housing (10) has a first opening end (12) and a second opening end (14); the end cover structure (30) comprises a first end cover structure (31) and a second end cover structure (32); the first end cover structure (31) is located at the first opening end (12), and the second end cover structure (32) is located at the second opening end (14).

20. A battery assembly method for assembling a battery according to any one of claims 16 to 19, characterized in that: The assembly method comprises: Connecting the battery cell assembly (20) to the bottom of the housing (10); Performing a shrinking process on the outer shell (10) to form a limiting step (13) on the outer shell (10); Placing the end cover structure (30) on the limiting step (13) and connecting it to the battery core assembly (20); The end of the outer shell (10) is bent so as to cover the edge of the end cover structure (30).

21. The assembly method according to claim 20, characterized in that: Placing the end cover structure (30) on the limiting step (13) and connecting it to the battery cell assembly (20) comprises: Connecting a current collecting plate (100) to the battery cell assembly (20); Connecting the cover plate (200) to the collecting plate (100); The top of the side wall (112) of the current collecting plate (100) is formed into a flange and covers the edge of the cover plate (200).

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