Assembly method of battery cell, battery cell and energy storage device

Abstract

The present application relates to an assembly method of a battery cell, a battery cell and an energy storage device, wherein the assembly method can improve the assembly efficiency of the battery cell, and includes: welding the positive electrode tab of the battery cell assembly to the pole column in a pole column assembly through an adapter piece, welding the negative electrode tab of the battery cell assembly to the pole column in another pole column assembly through another adapter piece, each of the pole column assemblies including a fixing member, an insulating member and a pole column, the pole column passing through the insulating member, and the fixing member being arranged on the outer peripheral edge of the insulating member; putting the battery cell assembly and the pole column assembly together into the cavity of the housing from the opening of the housing; assembling a cover plate having two through holes on the pole column assembly so that the two pole column assemblies are placed in different through holes; fixing the fixing member and the cover plate together; and assembling the cover plate on the opening of the housing and fixing it to the housing.

Description

Technical Field

[0001] The present application relates to the technical field of lithium batteries, and particularly to an assembly method for a battery cell, a battery cell, and an energy storage device. Background Art

[0002] The battery cell of a lithium battery in the prior art mainly consists of components such as a battery top cover, a housing, a wound core, and connection plates. The battery top cover includes a cover plate, a positive terminal, a negative terminal, a positive upper insulating member, a negative upper insulating member, a sealing ring, an explosion-proof valve, a positive lower insulating member, a negative lower insulating member, etc.

[0003] During the assembly of the battery cell, the positive terminal is assembled with the sealing ring, the positive lower insulating member, and the cover plate by injection molding of the positive upper insulating member. The sealing ring plays a sealing role, and the positive upper insulating member plays a fixing and stress-bearing role; similarly, the negative terminal is assembled with the sealing ring, the negative lower insulating member, and the cover plate by injection molding of the negative upper insulating member. The sealing ring plays a sealing role, and the negative upper insulating member plays a fixing and stress-bearing role. The wound core has positive and negative tabs, the tabs are connected to the connection plates, and the connection plates are connected to the positive and negative terminals on the top cover to conduct the current out of the battery. The battery top cover and the housing are sealed by laser welding. The wound core has positive and negative tabs, the tabs are connected to the connection plates, and the connection plates are connected to the positive and negative terminals on the top cover to conduct the current out of the battery. The battery top cover and the housing are sealed by laser welding. The current battery cell structure is complex, with many components, and the battery assembly process is complex, resulting in low assembly efficiency and high assembly costs. Summary of the Invention

[0004] Based on this, in view of the problem of complex battery cell assembly process, it is necessary to provide an assembly method for a battery cell. A battery cell assembled based on this method is also proposed. An energy storage device having the above battery cell is also proposed.

[0005] According to one aspect of the present application, an assembly method for a battery cell includes: welding the positive tab of the battery cell assembly to the pole of a pole assembly through an adapter piece, welding the negative tab of the battery cell assembly to the pole of another pole assembly through another adapter piece, each of the pole assemblies including a fixing member, an insulating member, and a pole, the pole passing through the insulating member, and the fixing member being disposed on the outer peripheral edge of the insulating member; placing the battery cell assembly and the pole assembly together into the cavity of the housing from the opening of the housing; assembling a cover plate having two through holes on the pole assembly so that the two pole assemblies are placed in different through holes; fixing the fixing member and the cover plate together; and assembling the cover plate on the opening of the housing and fixing it to the housing.

[0006] In the method for assembling a battery cell of the present application, the terminal assembly is connected to the battery cell assembly as a whole, and the terminal assembly includes three structural components: a fixing member, an insulating member, and a terminal. With such a design, the present application can assemble multiple structural components in the top cover structure of the battery cell together with the battery cell assembly at one time; and the process of assembling with the battery cell assembly can be integrated into the process line for manufacturing the battery cell assembly. In this way, the number of process steps required to complete the assembly of the entire battery is small, the process difficulty can be reduced, the assembly efficiency can be improved, the yield of the battery cell is high, and thus the production cost of the battery process is also greatly reduced.

[0007] In some embodiments, it further includes the step of providing the terminal assembly, including: combining and fixing the insulating member and the terminal together by an injection molding process; sleeving the fixing member on the outer peripheral edge of the insulating member.

[0008] In some embodiments, the step of providing the terminal assembly further includes: filling the gap between the fixing member and the insulating member with a sealant.

[0009] In some embodiments, fixing the fixing member to the cover plate includes: welding the fixing member to the inner wall of the through hole, and / or riveting the fixing member to the cover plate.

[0010] In some embodiments, welding the fixing member to the inner wall of the through hole includes: welding the upper and lower edges of the fixing member to the inner wall of the through hole along the circumferential direction respectively.

[0011] In some embodiments, fixing the fixing member to the cover plate includes: hermetically connecting the fixing member to the cover plate with a sealant.

[0012] In some embodiments, fixing the cover plate to the housing includes: welding the cover plate to the housing.

[0013] According to another aspect of the present application, a battery cell is obtained by assembling with the above method. The battery cell includes: a housing, which is provided with a cavity having an opening; a top cover structure, assembled to the opening, the top cover structure and the housing enclose a receiving cavity, the top cover structure includes a cover plate, the cover plate is provided with two through holes, and a terminal assembly is respectively arranged in each through hole. The terminal assembly includes a fixing member, an insulating member, and a terminal. The terminal passes through the insulating member, the fixing member is sleeved and fixed on the outer peripheral edge of the insulating member, and the fixing member is hermetically fixed in the through hole; and a battery cell assembly, arranged in the receiving cavity, and the positive electrode tab and the negative electrode tab of the battery cell assembly are respectively electrically connected to the two terminals through adapter plates.

[0014] In some embodiments, the top of the pole protrudes from the top surface of the insulating member, and the bottom of the pole protrudes from the bottom surface of the insulating member.

[0015] In some embodiments, the shapes and / or sizes of the fixing members of the two pole assemblies are different; the shapes and / or sizes of the through holes corresponding to the two fixing members are different.

[0016] In some embodiments, a sealing ring is further provided between the pole and the insulating member, and the sealing ring is sleeved on the pole.

[0017] In some embodiments, at least a portion of the inner diameter of the through hole is smaller than the outer diameter of a portion of the fixing member corresponding to the height.

[0018] In the battery cell of the present application, since the pole, fixing part, insulating part and pole are integrated into a pole assembly, when the pole needs to be repaired, the cover can be removed and then the pole assembly can be replaced as a whole, thereby greatly reducing the difficulty of rework and improving the efficiency of rework.

[0019] According to another aspect of the present application, an energy storage device includes: an energy storage cabinet, the energy storage cabinet includes a cabinet body, the cabinet body includes a battery cabinet area, a control cabinet area and an inverter cabinet area; a battery pack, arranged in the battery cabinet area, the battery pack includes the battery cells; an inverter, the inverter is arranged in the inverter cabinet area; a control component, the control component is arranged in the control cabinet area, and the control component is electrically connected to the battery pack and the inverter.

[0020] Another aspect of the present application provides an energy storage device that uses battery cells obtained by the aforementioned method. The cost of the battery cells is low, and the energy storage device can easily obtain a high-capacity energy storage device that meets the needs while controlling the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the battery cell of the present application.

[0022] Figure 2 This is a schematic diagram of an exploded view of a battery cell of the present application.

[0023] Figure 3 The present invention is a flowchart of a method for assembling a battery cell.

[0024] Figure 4a It is a schematic diagram of the connection between the pole assembly and the pole ear of the battery cell assembly in one embodiment of the battery cell of the present application.

[0025] Figure 4b This is a schematic diagram of the connection between the pole assembly and the pole ear of the battery cell assembly in another embodiment of the battery cell of the present application.

[0026] Figure 5Schematic diagram when the terminal post assembly of the present application and the battery cell assembly are placed into the housing together.

[0027] Figure 6 Schematic diagram after the cover body and the terminal post assembly in the battery single body are assembled.

[0028] Figure 7 Schematic diagram of the state before the fixing member in the cover body and the terminal post assembly are riveted.

[0029] Figure 8 Schematic diagram of the structure of the energy storage device of the present application.

[0030] Reference numerals:

[0031] 100, battery single body; 10, housing; 110, opening; 120, cavity; 20, top cover structure; 210, cover plate; 211, through hole; 212, contraction part; 220, terminal post assembly; 221, fixing member; 2211, inclined surface; 222, insulating member; 223, terminal post; 224, sealing ring; 30, battery cell assembly; 310, positive tab; 320, adapter plate; 330, negative tab; 200, energy storage device; 40, energy storage cabinet; 410, battery cabinet area; 420, control cabinet area; 430, inverter cabinet area; 50, battery pack; 60, inverter; 70, control component. Detailed implementation manners

[0032] To make the above objects, features and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application with reference to the drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that if there appear such terms as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0034] In addition, if the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0035] In this application, unless otherwise clearly stipulated and defined, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In this application, unless otherwise clearly stipulated and defined, if there is a description such as a first feature being "on" or "under" a second feature, the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0038] As described in the background art, the structure of the battery cell of the existing lithium battery is complex, there are many components in the battery top cover, the existing battery assembly process is complex, the assembly efficiency is low, and the assembly cost is relatively high. Specifically, after the battery cell manufacturer prepares the battery cell assembly, the battery cell assembly is assembled with the battery top cover, the outer shell, etc. Since the battery top cover includes multiple structural parts, multiple processes are required to complete the assembly of the structural parts, resulting in low assembly efficiency and high cost of the battery cell.

[0039] To this end, one aspect of the present application proposes an assembly method for a battery cell, which can reduce the difficulty of the assembly process and the production cost, thereby solving the above existing problems.

[0040] For ease of understanding the present application, first, the structure of the battery cell 100 assembled by the method of the present application will be described. Refer to Figure 1 and Figure 2 , the battery cell 100 of the present application includes a housing 10, a top cover structure 20, and an electrode core assembly 30.

[0041] The housing 10 is provided with a cavity 120 having an opening 110. Specifically, the housing 10 is a hollow cavity structure with an opening 110 at one end. The electrode core assembly 30 can be inserted into the housing 10 through the opening 110.

[0042] The top cover structure 20 is assembled to the opening 110, and the top cover structure 20 and the housing 10 enclose a receiving cavity. When the electrode core assembly 30 is inserted into the housing 10, the top cover structure 20 and the housing 10 enclose the electrode core assembly 30 in the receiving cavity. The top cover structure 20 includes a cover plate 210, and two through holes 211 are provided in the cover plate 210. Pole column assemblies 220 are respectively arranged in the through holes 211. That is, a total of two pole column assemblies 220 are provided, and the two pole column assemblies 220 are respectively connected to the positive electrode tab 310 and the negative electrode tab 330 of the electrode core assembly 30.

[0043] The pole column assembly 220 includes a fixing member 221, an insulating member 222, and a pole column 223. The pole column 223 passes through the insulating member 222, and the fixing member 221 is sleeved and fixed on the outer peripheral edge of the insulating member 222, and the fixing member 221 is hermetically fixed in the through hole 211. In the battery cell 100 of the present application, the pole column assembly 220 is taken as a whole, and it is fixed to the cover plate 210 through the cooperation of the fixing member 221 and the cover plate 210. The fixing member 221 is hermetically fixed in the through hole 211, which means that the fixing member 221 is fixedly assembled in the through hole 211 and is hermetically arranged with the through hole 211.

[0044] In the terminal post assembly 220, the terminal post 223 passes through the insulating member 222, and the insulating member 222 insulates it from the fixing member 221. Then, when the terminal post assembly 220 is fixed to the cover plate 210, the terminal post 223 can be insulated from the cover plate 210. The fixing member 221 is sleeved and fixed on the outer peripheral edge of the insulating member 222, and the fixing member 221 can be connected and cooperated with the cover plate 210 without damaging the insulating member 222. Moreover, the fixing member 221 is additionally arranged outside the insulating member 222, and the fixing member 221 is connected to the cover plate 210. The fixing member 221 and the cover plate 210 can be fixed by welding, so that there is a good connection and sealing effect between the terminal post assembly 220 and the cover plate 210. The bottom of the terminal post 223 is used for electrically connecting with the tab of the battery cell assembly 30, and the top of the terminal post 223 is used for electrically connecting with other battery cells 100 or external electrical devices.

[0045] The battery cell assembly 30 is arranged in the accommodating cavity. The positive tab 310 and the negative tab 330 of the battery cell assembly 30 are respectively and electrically connected to the two terminal posts 223 through the adapter plates 320. The battery cell assembly 30 is filled with electrolyte, and the electrolyte contains electrolytes and is the carrier for ion transmission in the battery. It is generally composed of lithium salts and organic solvents. During the charging and discharging processes of the lithium battery, lithium ions move back and forth between the positive electrode and the negative electrode. The electrolyte is the medium for the back-and-forth migration of lithium ions, causing a potential difference between the positive electrode and the negative electrode of the battery, thereby generating an electric current, and further enabling the battery to work properly. The adapter plate 320 is used for electrically connecting the tab and the terminal post 223, and can also be used to prevent damage to the battery or burning of other components when the battery cell assembly 30 is short-circuited or overcharged or over-discharged, thereby ensuring the safety of battery use.

[0046] Reference Figures 3 to 6 , the assembling method of the battery cell 100 of the present application includes the following steps.

[0047] S100. Weld the positive tab 310 of the battery cell assembly 30 to the terminal post 223 in a terminal post assembly 220 through an adapter plate 320, and weld the negative tab 330 of the battery cell assembly 30 to the terminal post 223 in another terminal post assembly 220 through another adapter plate 320. Each terminal post assembly 220 includes a fixing member 221, an insulating member 222, and a terminal post 223. The terminal post 223 passes through the insulating member 222, and the fixing member 221 is arranged on the outer peripheral edge of the insulating member 222.

[0048] Reference Figure 4a, in this step, before being assembled with the battery cell assembly 30, the pole column assembly 220 is an integral body. That is, the fixing member 221, the insulating member 222, and the pole column 223 have been formed into an integral body, namely the pole column assembly 220. In this step, two pole column assemblies 220 are respectively connected to the positive electrode tab 310 and the negative electrode tab 330 of the battery cell assembly 30. Taking the connection between one of the pole column assemblies 220 and the positive electrode tab 310 as an example: the pole column 223 in this pole column assembly 220 is correspondingly the positive pole column. The positive pole column is electrically connected to the positive electrode tab 310 through a connecting piece 320, and the positive pole column can be welded to the connecting piece 320. The connection method of the other pole column assembly 220 to the negative electrode tab 330 is similar.

[0049] S200. Put the battery cell assembly 30 and the pole column assembly 220 together into the cavity 120 of the housing 10 from the opening 110 of the housing 10. Refer to Figure 5 , after the pole column assembly 220 is connected to the battery cell assembly 30, put the pole column assembly 220 and the battery cell assembly 30 together into the cavity 120 of the housing 10 from the opening 110 of the housing 10. Here, the battery cell assembly 30 can be integrally placed into the cavity 120 of the housing 10.

[0050] S300. Assemble the cover plate 210 having two through holes 211 to the pole column assembly 220, so that the two pole column assemblies 220 are placed in different through holes 211.

[0051] Refer to Figure 6 , assemble the cover plate 210 with the pole column assembly 220, so that the two pole column assemblies 220 are respectively embedded into the two through holes 211 of the cover plate 210. In this way, the cover plate 210 and the pole column assembly 220 are assembled together.

[0052] Exemplarily, in the state where the opening 110 of the housing 10 faces upward, use the adsorption assembly to adsorb the cover plate 210, so that the cover plate 210 moves from top to bottom, and align the two through holes 211 of the cover plate 210 with the two pole column assemblies 220 respectively. Then, the two pole column assemblies 220 respectively enter the two through holes 211. After the two pole column assemblies 220 are respectively embedded into the two through holes 211 of the cover plate 210, the fixing member 221 of the pole column assembly 220 is assembled with the through hole 211.

[0053] Optionally, the shape of the inner wall of the through hole 211 matches the outer shape of the pole column assembly 220, and chamfers are provided at the upper and lower edges of the inner wall of the through hole 211. The chamfers play a guiding role when the through hole 211 and the pole column assembly 220 are inserted and matched. The matching of their shapes plays a role in preventing misinsertion during the insertion and assembly, avoiding incorrect insertion.

[0054] Optionally, the through hole 211 is a non-circular hole, and the outer contour of the cross-section of the fixing member 221 is non-circular and matches the shape of the through hole 211. For example, the through hole 211 is a rectangular hole, and the fixing member 221 is a cuboid structure. The through hole 211 is a non-circular hole. With such a design, after the pole assembly 220 is inserted into the through hole 211, the fixing member 221 and the through hole 211 cannot rotate relative to each other, thus playing a role of pre-positioning and facilitating the subsequent fixing of the fixing member 221 and the cover plate 210 together.

[0055] Optionally, the shapes and / or sizes of the fixing members 221 of the two pole assemblies 220 are different; the shapes and / or sizes of the through holes 211 corresponding to the two fixing members 221 are different. In this way, during the assembly of the cover plate 210 and the pole assembly 220, misassembly can be avoided.

[0056] For example, the cross-section of one of the fixing members 221 is a pentagon, and the cross-section shape of the corresponding through hole 211 is a pentagon. The cross-section of the other fixing member 221 is a quadrilateral, and the cross-section shape of the corresponding through hole 211 is a quadrilateral. Another example is that the diameter of one of the fixing members 221 is significantly larger than the diameter of the other fixing member 221.

[0057] S400. Fix the fixing member 221 and the cover plate 210 together.

[0058] In this step, through the connection between the fixing member 221 and the cover plate 210, the cover plate 210 and the pole assembly 220 can be fixed together. At this time, the cover plate 210, the pole assembly 220, and the battery cell assembly 30 also form a whole. Exemplarily, the fixing member 221 and the cover plate 210 are fixed together by welding or connected by glue.

[0059] In some embodiments, at least part of the inner diameter of the through hole 211 is smaller than the outer diameter of the corresponding height part of the fixing member 221, so that the fixing member 221 and the cover plate 210 are riveted and connected.

[0060] Specifically, as Figure 7 shown, it shows the state before the cover plate 210 and the fixing member 221 are riveted. Among them, a shrinkage part 212 with a reduced inner diameter is provided at the lower part of the through hole 211 of the cover plate 210, and the side surface of the fixing member 221 is an inclined surface 2211. The outer diameter of the inclined surface 2211 corresponding to the shrinkage part 212 is larger than the inner diameter of the shrinkage part 212. The fixing member 221 and the cover plate 210 can be cooperated through a riveting process, and the inclined surface 2211 and the shrinkage part 212 are pressed against each other.

[0061] Optionally, at least part of the inner diameter of the through hole 211 is smaller than 1%-5% of the outer diameter of the corresponding height part of the fixing member 221, such as 1%, 1.5%, 3%, 4.2%, 5%.

[0062] S500. Assemble the cover plate 210 to the opening 110 of the housing 10 and fix it to the housing 10.

[0063] In this step, in specific implementation, according to the situation, appropriately adjust the position of the overall formed by the cover plate 210, the pole column assembly 220, and the battery cell assembly 30, so that the cover plate 210 is assembled to the opening 110 of the housing 10 and fixed to the housing 10. The final assembly effect is as Figure 1 shown. After the cover plate 210 is assembled to the opening 110 of the housing 10, the cover plate 210 closes the opening 110 and an accommodation cavity is formed between the cover plate 210 and the housing 10. In specific operation, for example, the housing 10 can be kept unchanged and the position of the overall formed by the cover plate 210, the pole column assembly 220, and the battery cell assembly 30 can be finely adjusted; or the opposite operation method can be adopted.

[0064] The method of fixing the cover plate 210 to the housing 10 is not limited. It can be the same as the method in the prior art. For example, at least one of the methods such as welding, snap connection, and fastener connection can be used to fixedly connect the cover body to the housing 10.

[0065] In the assembly method of the battery cell 100 of the present application, the pole column assembly 220 is connected to the battery cell assembly 30 as a whole, and the pole column assembly 220 includes three structural components: a fixing member 221, an insulating member 222, and a pole column 223. With such a design, the present application can assemble multiple structural components in the top cover structure 20 of the battery cell 100 to the battery cell assembly 30 at one time; and the process of assembling with the battery cell assembly 30 can be integrated in the process line for preparing the battery cell assembly 30. In this way, the number of process steps required to complete the assembly of the entire battery is less, the process difficulty can be reduced, the assembly efficiency can be improved, the yield rate of the battery cell 100 is high, and thus the production cost of the battery process can be greatly reduced.

[0066] It is easy to understand that the preparation of the pole column assembly 220 can be completed in advance before the process of preparing the battery cell assembly 30 starts; it can also be carried out synchronously during the process of preparing the battery cell assembly 30, and the two can be connected only when the battery cell assembly 30 meets the connection condition after winding is completed.

[0067] In some embodiments, it further includes the step of providing the pole column assembly 220, including:

[0068] S600. Combine and fix the insulating member 222 and the pole column 223 together by an injection molding process. The insulating member 222 and the pole column 223 are formed into an integral part by an injection molding process. Exemplarily, the insulating member 222 is only arranged around the pole column 223 for one week. Exemplarily, the insulating member 222 wraps the pole column 223, and the insulating member 222 further has a protruding portion embedded in the groove on the pole column 223.

[0069] Reference Figure 4a 、 Figure 5 Moreover, a sealing ring 224 is further provided between the terminal post 223 and the insulating member 222. The sealing ring 224 is sleeved on the terminal post 223. The sealing ring 224 forms a seal between the terminal post 223 and the insulating member 222, preventing loosening between the terminal post 223 and the insulating member 222 after long-term use of the battery cell 100, which may cause leakage. After injection molding, the insulating member 222 covers the terminal post 223 and the sealing ring 224.

[0070] Optionally, in another embodiment, reference Figure 4b ,a sealing ring 224 is not provided between the terminal post 223 and the insulating member 222. The insulating member 222 directly covers the terminal post 223.

[0071] S700. Sleeve the fixing member 221 on the outer peripheral edge of the insulating member 222.

[0072] It is easy to understand that the fixing member 221 is specifically a hollow element, and its inner diameter is not less than the outer diameter of the insulating member 222. Preferably, the inner diameter of the fixing member 221 is set to be equal to the outer diameter of the insulating member 222. In this way, after the fixing member 221 is sleeved on the insulating member 222, the two are in a tight fit state and will not move relative to each other, which is conducive to subsequent connection of the fixing member 221 and the insulating member 222 with a sealant.

[0073] Furthermore, the shape of the inner surface of the fixing member 221 is adapted to the shape of the outer peripheral edge of the insulating member 222. With this design, after the fixing member 221 is sleeved on the insulating member 222, the two are in a tight fit state at all circumferential positions.

[0074] Furthermore, the step of providing the terminal post assembly 220 further includes: S800. Fill the gap between the fixing member 221 and the insulating member 222 with a sealant. The type of the sealant is not limited. For example, it can be a thermosetting adhesive or a photocuring adhesive.

[0075] To prevent leakage due to a gap between the fixing member 221 and the insulating member 222 after the battery cell 100 is assembled. In this step, the gap between the fixing member 221 and the insulating member 222 is filled with a sealant, which not only plays a sealing role but also strengthens the connection between the fixing member 221 and the insulating member 222.

[0076] In some embodiments, step S400 of fixing the fixing member 221 and the cover plate 210 together includes: S410. Weld the fixing member 221 to the inner wall of the through hole 211 and / or rivet the fixing member 221 to the cover plate 210.

[0077] In step S410, when connecting the fixing member 221 to the inner wall of the through hole 211 by welding, it can not only realize the connection between the fixing member 221 and the cover plate 210, but also facilitate achieving good sealing. It is easy to understand that at this time, the materials of the fixing member 221 and the cover plate 210 are configured to be interconnected by welding.

[0078] When the fixing member 221 and the cover plate 210 are riveted and connected, the fixing member 221 and the cover plate 210 can also be additionally connected by welding at the top of the fixing member 221, which can play a role in sealing.

[0079] Exemplarily, the materials of both the fixing member 221 and the cover plate 210 are aluminum. The fixing member 221 is welded to the inner wall of the through hole 211 by laser welding. Further, on the basis of welding, a sealant can be additionally used to assist in connecting the fixing member 221 and the cover plate 210, such as covering a layer of sealant on the weld seam. This can avoid leakage due to poor welding.

[0080] Further, step S410 of welding the fixing member 221 to the inner wall of the through hole 211 includes: welding the upper and lower edges of the fixing member 221 and the inner wall of the through hole 211 along the circumference.

[0081] In this step, during welding, the upper and lower edges of the inner wall of the through hole 211 are respectively welded to the circumference of the fixing member 221, so that a weld seam is formed on each of the upper and lower sides of the cover plate 210. In this way, on the one hand, the connection is more reliable, and on the other hand, the sealing effect is better.

[0082] In some embodiments, step S400 of fixing the fixing member 221 and the cover plate 210 together includes: S420 of hermetically connecting the fixing member 221 and the cover plate 210 with a sealant.

[0083] In addition to using the welding process, it is also possible to use a sealant to connect the fixing member 221 and the cover plate 210. Specifically, sealant can be injected between the fixing member 221 and the cover plate 210, or a ring of sealant can be respectively provided at the upper and lower edges of the inner wall of the through hole 211. Optionally, the sealant is a photo-curing adhesive or a heat-curing adhesive, which is not limited in this application.

[0084] In some embodiments, fixing the cover plate 210 to the housing 10 mentioned above includes: welding the cover plate 210 to the housing 10. That is, the cover plate 210 and the housing 10 are connected by welding. Exemplarily, both the cover plate 210 and the housing 10 are made of aluminum, and the cover plate 210 and the housing 10 are connected by laser welding along the circumference.

[0085] Reference Figure 1 、 Figure 2, Figure 3 , on the other hand, the present application further provides a battery cell 100 assembled by the foregoing method. The structure of the battery cell 100 is as described above and will not be elaborated herein.

[0086] In some embodiments, the top of the pole post 223 protrudes from the top surface of the insulating member 222, and the bottom of the pole post 223 protrudes from the bottom surface of the insulating member 222. The top and bottom of the pole post 223 in each pole post assembly 220 protrude from the insulating member 222 respectively. The top of the pole post 223 protruding from the top surface of the insulating member 222 facilitates the connection of the top of the pole post 223 to other batteries. The bottom of the pole post 223 protruding from the bottom surface of the insulating member 222 facilitates the connection of the bottom of the pole post 223 to the adapter plate 320, for example, by welding.

[0087] In the battery cell 100 of the present application, since the fixing member 221, the insulating member 222, and the pole post 223 are integrated into the pole post assembly 220, when the pole post 223 needs to be repaired, the cover plate 210 can be removed, and then the pole post assembly 220 can be replaced as a whole. Then, the pole post assembly 220 is connected to the tab of the battery cell assembly 30 again, and finally the cover plate 210 is installed. This greatly reduces the difficulty of repair and improves the repair efficiency.

[0088] Reference Figure 8 , on yet another aspect, the present application further provides an energy storage device 200. The energy storage device 200 includes an energy storage cabinet 40, a battery pack 50, an inverter 60, and a control component 70.

[0089] The energy storage cabinet 40 includes a cabinet body, and the cabinet body includes a battery cabinet area 410, a control cabinet area 420, and an inverter cabinet area 430. The battery pack 50 is disposed in the battery cabinet area 410. The battery pack 50 includes a plurality of the foregoing battery cells 100. The plurality of battery cells 100 can be arranged in series, parallel, or a combination of series and parallel. The inverter 60 is disposed in the inverter cabinet area 430. The control component 70 is disposed in the control cabinet area 420, and the control component 70 is electrically connected to both the battery pack 50 and the inverter 60.

[0090] In some embodiments, the battery cabinet area 410, the control cabinet area 420, and the inverter cabinet area 430 are arranged from bottom to top. In this way, the heavier battery pack 50 is placed at the lower part of the cabinet body, and the stability is better. The cabinet body is integrally divided into a plurality of functional areas in the longitudinal direction, so that the space occupied by the cabinet body on the ground can be reduced.

[0091] The energy storage device 200 provided in yet another aspect of the present application uses the battery cell 100 obtained by the foregoing method. The battery cell 100 has a high yield and low cost. The energy storage device 200 can easily obtain a high-capacity energy storage device 200 that meets the requirements on the premise of controlling costs, and has stable performance and low repair rate.

[0092] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0093] The above embodiments only express several implementation manners of the present application, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A method for assembling a battery cell, characterized in that: include: The positive pole ear of the battery cell assembly is welded to the pole in one pole assembly through an adapter, and the negative pole ear of the battery cell assembly is welded to the pole in another pole assembly through another adapter, each pole assembly includes a fixing part, an insulating part, and a pole, the pole is inserted into the insulating part, the fixing part is arranged on the outer periphery of the insulating part, and the pole, the fixing part, and the insulating part are integrated into a pole assembly; Put the battery cell assembly and the pole assembly together into the cavity of the shell through the opening of the shell; The cover plate is adsorbed by the adsorption assembly so that the cover plate moves from top to bottom, and the two through holes of the cover plate are respectively aligned with the two pole assemblies, so that the two pole assemblies are respectively embedded in different through holes and the fixing piece is assembled with the through hole, and the shape of the inner wall of the through hole is consistent with the shape of the corresponding fixing piece; Welding the fixing member to the inner wall of the through hole so that the fixing member is sealed and fixed in the through hole; and The cover plate is assembled to the opening of the housing and fixed to the housing.

2. The method according to claim 1, characterized in that Also included is the step of providing the pole assembly, comprising: The insulating member and the pole are fixed together by an injection molding process; The fixing piece is sleeved on the outer periphery of the insulating piece.

3. The method according to claim 1, characterized in that The fixing member is welded to the inner wall of the through hole, comprising: welding the fixing member to the upper and lower edges of the inner wall of the through hole respectively along the circumferential direction.

4. The method according to claim 1, characterized in that: Fixing the cover plate to the shell includes: welding the cover plate to the shell.

5. The method according to claim 1, characterized in that The through hole is a non-circular hole, and the outer contour of the cross section of the fixing piece is non-circular and matches the shape of the through hole.

6. The method according to claim 5, characterized in that The through hole is a rectangular hole, and the fixing piece is a rectangular parallelepiped structure.

7. The method according to claim 1, characterized in that The shapes and / or sizes of the fixing members of the two pole assemblies are different; the shapes and / or sizes of the through holes corresponding to the two fixing members are different.

8. The method according to claim 7, characterized in that The cross section of one of the fixing members is a pentagon, and the cross section of the corresponding through hole is a pentagon; the cross section of the other fixing member is a quadrilateral, and the cross section of the corresponding through hole is a quadrilateral.

9. The method according to claim 1, characterized in that: The materials of the fixings and the cover are both aluminum.

10. The method according to claim 9, characterized in that The cover plate and the shell are connected by laser welding along the circumference.

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