Battery cell adapter plate, battery cell and manufacturing method of battery cell

Abstract

The application provides a battery cell adapter plate, which comprises a pole connecting part and a plurality of electrode connecting parts, the electrode connecting parts are connected with the pole connecting part at one end in the horizontal direction, the electrode connecting parts can rotate around the connection with the pole connecting part in the horizontal direction, and the plurality of electrode connecting parts are arranged at intervals in the vertical direction.In the battery cell adapter plate provided by the application, the electrode connecting parts can rotate around the vertical axis relative to the pole connecting part, so that when each electrode connecting part is fixedly installed with the cell stack of the corresponding height, the remaining electrode connecting parts can be rotated to avoid the electrode connecting part being currently installed, the installation operation space of the current electrode connecting part and the cell stack is expanded, the operation difficulty of manufacturing and maintaining the battery cell is reduced, and the connection between the pole connecting part and each electrode connecting part only allows the electrode connecting part to rotate in the horizontal direction, so that the stability of the internal structure of the battery cell is ensured, and the use safety of the battery cell is improved.The application further provides a battery cell and a manufacturing method of the battery cell.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to a cell adapter, a cell including the cell adapter, and a method for manufacturing the cell. Background Technology

[0002] Energy is one of the biggest challenges and dilemmas facing the 21st century, and sustainable energy development is one of the important guarantees for sustainable social and economic development. Currently, battery cells are mainly produced by connecting multiple small-capacity batteries (cell stacks) in parallel or in combination to obtain large capacity, in order to meet the requirements of large power sources.

[0003] In existing battery cell assembly processes, multiple cell stacks are typically connected in series and parallel using connecting tabs, then welded to a housing top cover with fixed external terminals to form a single unit. This is then assembled into the housing, and finally, the housing top cover is fixedly connected to the housing body to enclose the cell stacks inside. However, in existing technologies, the connecting tabs are only used for parallel connections between the electrical connections of the cell stacks and are not used for supporting and positioning the cell stacks. This results in unstable cell stack positions, poor safety, and a complex structure. Welding the cell stacks and connecting tabs to the housing top cover requires limited operating space and is difficult. Furthermore, it is difficult to observe whether the assembled structure is in the correct position, leading to high battery cell manufacturing costs.

[0004] Therefore, how to provide a battery cell structure that is simple in structure and easy to manufacture and maintain has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The present invention aims to provide a battery cell adapter, a battery cell including the battery cell adapter, and a method for manufacturing the battery cell. The battery cell is easy to manufacture and maintain, and has a stable internal structure.

[0006] To achieve the above objectives, as one aspect of the present invention, a battery cell adapter is provided, including a terminal connection portion and a plurality of electrode connection portions, wherein one end of the electrode connection portion in the horizontal direction is connected to the terminal connection portion, so that the electrode connection portion can rotate relative to the terminal connection portion about the connection point in the horizontal direction, and the plurality of electrode connection portions are spaced apart in the height direction.

[0007] Optionally, the connection position of each electrode connection portion to the pole post connection portion is different from the connection position of the adjacent electrode connection portion to the pole post connection portion.

[0008] Optionally, the electrode connection portion and the pole post connection portion are integrally formed.

[0009] Optionally, the electrode connection portion has a plurality of horizontally extending strip-shaped holes, the height of the plurality of electrode connections corresponds one-to-one with the height of the plurality of strip-shaped holes, and when the electrode connection portion is rotated to be parallel to the electrode connection portion, the electrode connection portion at least partially enters the corresponding strip-shaped hole.

[0010] As a second aspect of the present invention, a battery cell is provided, the battery cell comprising a housing, a pair of terminal assemblies, a plurality of core stacks and a pair of the aforementioned battery cell adapter pieces, wherein the two terminal assemblies are respectively disposed on two opposite side walls of the housing, the core stacks are disposed between the two terminal assemblies, and the two battery cell adapter pieces are disposed one-to-one between each terminal assembly and the core stack.

[0011] The electrode connection portion of each cell adapter piece is electrically connected to the corresponding side of the cell stack at the corresponding height, and the pole connection portion is electrically connected to the pole assembly on the corresponding side, so that the electrical connection portions on both sides of the cell stack are electrically connected to the pole assemblies on both sides through the two cell adapter pieces.

[0012] Optionally, the electrode connection portion includes a first main body portion and a first contact portion, with an included angle between the first main body portion and the first contact portion. One end of the first main body portion in the horizontal direction is connected to the electrode post connection portion. One side of the first contact portion is fixedly connected to the first main body portion, and the other side of the first contact portion extends in the direction toward the core stack. The top or bottom surface of the first contact portion is formed as a first connection platform, and the first connection platform is electrically connected to the corresponding electrical connection portion of the core stack.

[0013] Optionally, the electrical connection portions on both sides of the core stack are empty foils.

[0014] Optionally, the electrode assembly includes an outer electrode fixed outside the housing and an inner electrode disposed inside the housing, wherein the outer electrode and the inner electrode are electrically connected.

[0015] The electrode connection portion includes a second main body portion and a second contact portion. The electrode connection portion is connected to the second main body portion. One side of the second contact portion is fixedly connected to the second main body portion. The other side of the second contact portion extends away from the core stack. The bottom surface of the second contact portion is formed as a second connection platform. The second connection platform is electrically contacted and fixedly connected to the top of the corresponding inner electrode post.

[0016] Optionally, the housing includes a housing body and at least one housing cover. The housing body has two opposing top walls, and at least one of the top walls has an inlet for the core stack to enter the interior of the housing body. The housing cover closes the inlet one by one, wherein the surface area of ​​the top wall is larger than the surface area of ​​the other sides of the housing body.

[0017] Optionally, the electrode assembly further includes a first insulating pad and a second insulating pad, wherein the first insulating pad is disposed between the outer electrode and the side wall of the housing, and the second insulating pad is disposed between the inner electrode and the side wall of the housing.

[0018] Optionally, the electrode assembly further includes multiple connectors. Multiple mounting through holes are formed on the outer electrode, the inner electrode, the first insulating gasket, the second insulating gasket, and the side wall of the housing. The multiple connectors pass through the multiple mounting through holes on the inner electrode, the second insulating gasket, the housing, the first insulating gasket, and the outer electrode in a corresponding manner to fix the inner electrode and the outer electrode on the side wall of the housing and to electrically connect the inner electrode and the outer electrode to each other through the connectors.

[0019] Optionally, the connector is a rivet.

[0020] As a third aspect of the present invention, a method for manufacturing a battery cell is provided, characterized in that the method is used to manufacture the aforementioned battery cell, the method comprising:

[0021] Along the height direction, the electrical connection parts on both sides of each core stack are fixedly connected to the electrode connection parts at the corresponding heights of the two core adapter pieces. When fixing each electrode connection part to the corresponding electrical connection part, the remaining electrode connection parts that are not connected to the electrical connection parts are rotated away from the electrode connection parts that are currently to be fixedly connected to the electrical connection part.

[0022] The core stack and the two cell adapter pieces connected to it are disposed in the housing, so that the two pole connection parts are electrically connected to the pole assembly on the corresponding side respectively.

[0023] In the battery cell adapter, battery cell, and battery cell manufacturing method provided by the present invention, the battery cell adapter includes a terminal post connection portion and multiple electrode connection portions. One end of the electrode connection portion is connected to the terminal post connection portion and can rotate relative to the terminal post connection portion about a vertical axis. Thus, in the step of fixing each core stack using the battery cell adapter, the angle between the electrode connection portion and the terminal post connection portion can be freely adjusted. When fixing each electrode connection portion to the core stack of the corresponding height, the remaining electrode connection portions are rotated to avoid the electrode connection portion currently being installed, expanding the installation operation (e.g., welding) space between the current electrode connection portion and the core stack, thereby reducing the operational difficulty of manufacturing and maintaining the battery cell. Furthermore, the connection between the terminal post connection portion and each electrode connection portion only allows the electrode connection portion to rotate horizontally relative to the terminal post connection portion. Thus, the terminal post connection portions on both sides can stably support each core stack through the electrode connection portions, ensuring the stability of the internal structure of the battery cell. This effectively avoids problems such as short circuits caused by loosening of the core stack and improves the safety of battery cell use. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0025] Figure 1 This is an exploded view of the battery cell structure provided in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the cell adapter piece in the battery cell provided in an embodiment of the present invention;

[0027] Figure 3 yes Figure 2 A magnified view of a portion of region A in the middle;

[0028] Figure 4 This is a schematic diagram of the battery cell provided in an embodiment of the present invention from a three-dimensional perspective;

[0029] Figure 5 This is a top view of the battery cell provided in an embodiment of the present invention;

[0030] Figure 6 This is a cross-sectional view of the battery cell provided in an embodiment of the present invention;

[0031] Figure 7 yes Figure 6 A magnified view of a portion of region I.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100: Housing 110: Housing top cover

[0034] 120: Housing body; 200: Pole post assembly

[0035] 210: External pole post; 211: Assembly plate

[0036] 212: Contact head; 212a: Fixing part

[0037] 212b: Grab part; 220: Inner pole post

[0038] 230: First insulating gasket; 240: Second insulating gasket

[0039] 250: Connector; 300: Cell adapter piece

[0040] 310: Pole post connection part; 311: Second main body part

[0041] 311a: Slotted hole; 312: Second contact portion

[0042] 320: Electrode connection part; 321: First main body part

[0043] 322: First contact section; 400: Core assembly

[0044] 410: Electrical connection part Detailed Implementation

[0045] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0046] To address the aforementioned technical problems, as one aspect of the present invention, a cell adapter 300 applied to a battery cell is provided, such as... Figure 2 As shown, the cell adapter 300 includes a terminal connection portion 310 and multiple electrode connection portions 320. One end of each electrode connection portion 320 is connected to the terminal connection portion 310 in the horizontal direction, allowing the electrode connection portion 320 to rotate horizontally relative to the terminal connection portion 310 around the connection point. The multiple electrode connection portions 320 are spaced apart in the height direction. Figure 1 As shown, the cell adapter 300 is used to be arranged in pairs on both sides of the core stack 400 inside the cell, the electrode connection part 320 is used to be fixedly connected to the corresponding side of the electrical connection part 410 of the core stack 400 at the corresponding height in the cell, and the pole connection part 310 is used to be electrically connected to the pole assembly 200 on the corresponding side, so that the electrical connection parts 410 on both sides of the core stack 400 are electrically connected to the pole assemblies 200 on both sides through the two cell adapters 300.

[0047] The battery cell adapter 300 provided by this invention includes a terminal post connection portion 310 and multiple electrode connection portions 320. One end of each electrode connection portion 320 is connected to the terminal post connection portion 310 and can rotate relative to the terminal post connection portion 310 about a vertical axis. Therefore, when manufacturing a battery cell using the battery cell adapter 300 provided by this invention, the angle between the electrode connection portion 320 and the terminal post connection portion 310 can be freely adjusted during the step of fixing each core stack 400 using the battery cell adapter 300. When fixing each electrode connection portion 320 to a core stack 400 of corresponding height, the remaining electrode connection portions 320 can be rotated to avoid the currently being fixed. The installed electrode connection portion 320 expands the installation operation (e.g., welding) space between the current electrode connection portion 320 and the core stack 400, thereby reducing the difficulty of manufacturing and maintaining the battery cell. Furthermore, the connection between the pole post connection portion 310 and each electrode connection portion 320 only allows the electrode connection portion 320 to rotate horizontally relative to the pole post connection portion 310. Thus, the pole post connection portions 310 on both sides can stably support each core stack 400 through the electrode connection portion 320, ensuring the stability of the internal structure of the battery cell. This effectively avoids problems such as short circuits caused by loosening of the core stack and improves the safety of battery cell use.

[0048] It should be noted that, in the embodiments of the present invention, the core stack 400 refers to an energy storage unit made by stacking or winding multilayer electrodes and then covering the outer layer with a diaphragm.

[0049] As a second aspect of the present invention, a battery cell is provided, such as... Figure 1 , Figure 6 , Figure 7 As shown, the battery cell includes a housing 100, a pair of terminal post assemblies 200, a plurality of core stacks 400, and a pair of battery cell adapter pieces 300 provided in this embodiment of the invention. The two terminal post assemblies 200 are respectively disposed on two opposite side walls of the housing 100, the core stacks 400 are disposed between the two terminal post assemblies 200, and the two battery cell adapter pieces 300 are disposed one-to-one between each terminal post assembly 200 and each core stack 400.

[0050] The electrode connection portion 320 of each cell adapter is fixedly connected to the electrical connection portion 410 on the corresponding side of the core stack 400 at the corresponding height in the cell, and the pole connection portion 310 is electrically connected to the pole assembly 200 on the corresponding side, so that the electrical connection portions 410 on both sides of the core stack 400 are electrically connected to the pole assemblies 200 on both sides through the two cell adapters 300.

[0051] In the battery cell provided by this invention, the battery cell adapter 300 includes a terminal post connection portion 310 and a plurality of electrode connection portions 320. One end of each electrode connection portion 320 is connected to the terminal post connection portion 310 and can rotate relative to the terminal post connection portion 310 about a vertical axis. Therefore, when manufacturing a battery cell using the battery cell adapter provided by this invention, the angle between the electrode connection portion 320 and the terminal post connection portion 310 can be freely adjusted during the step of fixing each core stack 400 using the battery cell adapter. When fixing each electrode connection portion 320 to the core stack 400 of the corresponding height, the remaining electrode connection portions 320 can be rotated. By avoiding the electrode connection 320 currently being installed, the space for installation operations (e.g., welding) between the current electrode connection 320 and the core stack 400 is expanded, thereby reducing the difficulty of manufacturing and maintaining the battery cell. Furthermore, the connection between the pole post connection 310 and each electrode connection 320 only allows the electrode connection 320 to rotate in the horizontal direction. Thus, the pole post connection 310 on both sides can stably support each core stack 400 through the electrode connection 320, ensuring the stability of the internal structure of the battery cell. This effectively avoids problems such as short circuits caused by loose core stacks and improves the safety of battery cell use.

[0052] To improve the positional stability of the core stack 400 and ensure good contact between the electrode connection portion 320 and the electrical connection portion 410, preferably, as follows: Figure 2 , Figure 3 As shown, the electrode connection portion 320 includes a vertically arranged first main body portion 321 and a horizontally arranged first contact portion 322. An angle is formed between the first main body portion 321 and the first contact portion 322. One end of the first main body portion 321 in the horizontal direction is connected to the electrode post connection portion 310. One side of the first contact portion 322 is fixedly connected to the first main body portion 321, and the other side of the first contact portion 322 extends in the direction toward the core stack. The top or bottom surface of the first contact portion 322 forms a first connection platform, which is electrically connected to the corresponding electrical connection portion 410 of the core stack 400 (e.g., as shown in Figure 400). Figure 7 As shown, the first contact portion 322 is stacked on top of the corresponding electrical connection portion 410, which means that the bottom surface of the first contact portion 322 is the first connection platform.

[0053] In this embodiment of the invention, the electrode connection portion 320 includes a vertically arranged first main body portion 321 and a horizontally arranged first contact portion 322. The first contact portion 322 faces the corresponding core stack 400, thereby providing a stable horizontal mounting surface (first connection platform) to the electrical connection portion 410 of the core stack 400 through the first contact portion 322, ensuring the positional stability of the core stack 400. Furthermore, the horizontal first contact portion 322 can be stacked and contacted with the electrical connection portion 410, thereby reducing the contact resistance between the first contact portion 322 and the electrical connection portion 410, and thus ensuring the contact performance between the electrode connection portion 320 and the electrical connection portion 410.

[0054] Optionally, the first main body 321 is vertically arranged and the first contact part 322 is horizontally arranged, that is, the first main body 321 and the first contact part 322 are perpendicular to each other.

[0055] As an optional embodiment of the present invention, the electrical connection portions 410 on both sides of the core stack 400 are empty foils, that is, the core stack 400 is in the form of tabless, and the empty foils on both sides of the core stack 400 are directly connected to the cell adapter piece 300, thereby increasing the overcurrent area of ​​the core stack 400 for external electrical connection, which is beneficial for achieving fast charging. Figure 1 , Figure 7 As shown, the length of the electrical connection part 410 can be slightly greater than the distance between the core stack 400 body and the first contact part 322, so that the electrical connection part 410 is partially bent to provide a certain amount of expansion and contraction margin, so as to avoid the expansion of the core stack during charging, discharging and use, which would cause the electrical connection part 410 to be pulled and damaged.

[0056] Considering that the battery cells may be subjected to high-frequency vibrations during use when applied to electric vehicles, in order to ensure the stability of the connection between the internal structures of the battery cells, as a preferred embodiment of the present invention, the first contact portion 322 is welded to the electrical connection portion 410 of the core stack 400 (for example, by spot welding).

[0057] As a preferred embodiment of the present invention, such as Figure 3 As shown, the electrode connection portion 320 also includes a transition connection portion 323, which smoothly transitions between the first main body portion 321 and the first contact portion 322, thereby reducing the angular structure on the electrode connection portion 320, dispersing the stress at the connection between the first main body portion 321 and the first contact portion 322, and improving the structural strength of the electrode connection portion 320.

[0058] As an optional embodiment of the present invention, such as Figure 3 As shown, the electrode connection portion 320 also includes a rotating connection portion 324, and one end of the first main body portion 321 is connected to the electrode post connection portion 310 through the rotating connection portion 324.

[0059] Optionally, the rotating connection portion 324 can be a rotating joint including one or more rotating joints with axes extending vertically, that is, the first main body portion 321 is hinged to the pole post connection portion 310 through the rotating connection portion 324. To simplify the overall structure of the device, as a preferred embodiment of the present invention, such as... Figure 2 , Figure 3As shown, the rotating connection 324 can undergo plastic deformation under external force. That is, the pole connection 310 and the electrode connection 320 are made of the same material (for example, metal) and are formed as one piece (integral molding). The rotation of the electrode connection 320 is achieved by the deformation of the connection part (i.e., the rotating connection 324) between the pole connection 310 and the electrode connection 320.

[0060] To facilitate the flexible rotation of the electrode connection portion 320, in a preferred embodiment of the present invention, the width (i.e., the dimension along the vertical direction) of the rotating connection portion 324 is the same as the width of the first main body portion 321, and the thickness of the rotating connection portion 324 is less than the thickness of the first main body portion 321. That is, by reducing the thickness at the rotating connection portion 324, a weak area is formed at this position so that the position will deform preferentially under external force, thereby realizing the rotation of the electrode connection portion 320.

[0061] In some embodiments of the present invention, one end of a plurality of electrode connection portions 320 located on the same side is connected to an electrode post connection portion 310, i.e., as shown in the figure. Figure 2 As shown, the same end of the multiple electrode connection portions 320 is fixed, and all of them can rotate toward the same side of the pole post connection portion 310.

[0062] Alternatively, in other embodiments of the present invention, the orientation of the end of at least one electrode connection portion 320 connected to the pole post connection portion 310 is different from the orientation of the end of the other electrode connection portions 320 connected to the pole post connection portion 310. For example, optionally, the orientations of the ends of multiple electrode connection portions 320 connected to the pole post connection portion 310 are staggered along the height direction (hereinafter, the height direction refers to the vertical height direction of the cell adapter piece in use (i.e., disposed in the cell housing 100)). That is, the connection position of each electrode connection portion 320 connected to the pole post connection portion 310 is different from the connection position of the adjacent electrode connection portion 320 connected to the pole post connection portion 310, thereby improving the uniformity of the load on both ends of the pole post connection portion 310 in the horizontal direction.

[0063] To improve the space utilization rate of the battery cell and increase the structural compactness, as a preferred embodiment of the present invention, such as... Figure 2 As shown, the electrode post connection portion 310 has a plurality of horizontally extending strip-shaped holes 311a. The heights of the plurality of electrode connection portions 320 correspond one-to-one with the heights of the plurality of strip-shaped holes 311a. When the electrode connection portion 320 is rotated to be parallel to the electrode post connection portion 310, the electrode connection portion 320 at least partially enters the corresponding strip-shaped hole 311a. Specifically, the strip-shaped holes 311a are formed on the second main body portion 311 (and extend in a horizontal direction perpendicular to the line connecting the two electrical connection portions 410 of the core stack 400). When the first main body portion 321 is rotated to be parallel to the second main body portion 311, the first main body portion 321 is located in the corresponding strip-shaped hole 311a.

[0064] In this embodiment of the invention, when the first main body 321 is rotated to be parallel to the second main body 311, it can be just right to be housed in the corresponding strip hole 311a, thereby saving the space required for the battery cell along the connection direction of the two electrical connection parts 410 and improving the compactness of the overall structure.

[0065] As an optional embodiment of the present invention, such as Figure 1 , Figure 7 As shown, the pole assembly 200 includes an outer pole 210 fixed outside the housing 100 and an inner pole 220 disposed inside the housing 100, with the outer pole 210 and the inner pole 220 being electrically connected.

[0066] In this embodiment of the invention, the electrode assembly 200 includes an outer electrode post 210 fixed outside the housing 100 and an inner electrode post 220 disposed inside the housing 100. The electrical connection portion 410 of the core stack 400 is electrically connected to the outer electrode post 210 in sequence through the corresponding side (corresponding height) electrode connection portion 320, the electrode post connection portion 310, and the inner electrode post 220, thereby achieving the desired connection. Figure 1 As shown, the positive terminals of multiple core stacks are finally connected to the external terminal 210 marked with "+" through the cell adapter 300 on one side. Similarly, the negative terminals of multiple core stacks are finally connected to the external terminal 210 marked with "-" through the cell adapter 300 on the other side (not shown in the figure).

[0067] To further improve the convenience of manufacturing and maintaining battery cells, as a preferred embodiment of the present invention, such as... Figure 2 , Figure 7 As shown, the electrode connection portion 310 includes a second main body portion 311 and a second contact portion 312. The electrode connection portion 320 is connected to the second main body portion 311. One side of the second contact portion 312 is fixedly connected to the second main body portion 311, and the other side of the second contact portion 312 extends away from the core stack 400. The bottom surface of the second contact portion 312 is formed as a second connection platform. The second connection platform is electrically contacted and fixedly connected to the top end of the corresponding inner electrode 220.

[0068] Optionally, the second main body 311 is vertically arranged and the second contact part 312 is horizontally arranged, that is, the second main body 311 and the second contact part 312 are perpendicular to each other.

[0069] Preferably, the second main body 311 of the electrode connection portion 310 and the second contact portion 312 are integrally formed, that is, the electrode connection portion 310 is a sheet metal part with its top end bent away from the core stack 400. In this embodiment of the invention, the tops of both electrode connection portions 310 have outwardly projecting second contact portions 312, and make electrical contact with the inner electrode 220 through the second contact portions 312. Thus, when manufacturing the battery cell, the (stacked) core stack 400 with battery cell adapter pieces 300 installed on both sides can be placed into the housing body 120, and the second contact portion 312 can be used as a positioning structure, such as... Figure 7 As shown, the inner pole post 220 is a rigid part (that is, its shape will not easily change when bearing the weight of objects such as the core stack). The top of the inner pole post 220 remains in a fixed position relative to the housing body 120. Thus, by placing the second contact part 312 on the top of the inner pole posts 220 on both sides, the core stack 400 can be positioned and supported, which improves the convenience of manufacturing and maintaining the battery cell and the stability of the internal structure of the battery cell.

[0070] Considering that the battery cell may be subjected to high-frequency vibrations during use when applied to electric vehicles, in order to ensure the stability of the connection between the internal structures of the battery cell, as a preferred embodiment of the present invention, the second contact portion 312 is welded to the top end of the corresponding inner electrode post 220 (e.g., by spot welding). Alternatively, in other embodiments of the present invention, other connection methods that can ensure the vibration resistance performance of the overall structure can also be adopted. For example, the second contact portion 312 and the corresponding inner electrode post 220 can be connected by means of self-locking bolts or the like.

[0071] As an optional embodiment of the present invention, such as Figure 1 As shown, the housing 100 includes a housing body 120 and at least one housing cover 110. The housing body 120 has two opposing top walls, and at least one top wall has an inlet for the core stack 400 to enter the housing body 120. The housing cover 110 correspondingly closes the inlet of the housing body 120. The surface area of ​​the top wall of the housing body 120 is larger than the surface area of ​​each side of the housing body 120, that is, the cell structure adopts a large-area entry design. The surface of the housing cover 110 is the largest surface of the housing 100. Thus, after the cell adapter 300 and the core stack 400 are placed into the housing body 120, the area to be welded between the inner electrode post 220 and the second contact part 312 can be completely exposed, which is conducive to the welding of the inner electrode post 220 and the second contact part 312, making the assembly operation simpler and more convenient.

[0072] Optionally, the horizontal projection shape of the housing 100 can be rectangular (or an approximate rectangle with chamfered corners).

[0073] As an optional embodiment of the present invention, such as Figure 1 , Figure 4 As shown, an annular groove 121 is formed on the side wall of the housing body 120 to reduce the structural strength of the area and play a role in explosion protection.

[0074] As an optional embodiment of the present invention, such as Figure 1 , Figure 7 As shown, the pole assembly also includes a first insulating pad 230 and a second insulating pad 240. The first insulating pad 230 is disposed between the outer pole 210 and the side wall of the housing 100, and the second insulating pad 240 is disposed between the inner pole 220 and the side wall of the housing 100.

[0075] In this embodiment of the invention, a first insulating gasket 230 is provided between the outer pole post 210 and the side wall of the housing 100, and a second insulating gasket 240 is provided between the inner pole post 220 and the side wall of the housing 100, thereby preventing short circuits between the outer pole post 210 and the inner pole post 220 and the housing 100, and improving the safety of the battery cell.

[0076] As an optional embodiment of the present invention, such as Figure 1 , Figure 7 As shown, the pole assembly also includes multiple connectors 250. Multiple mounting through holes with corresponding positions are formed on the outer pole 210, inner pole 220, first insulating gasket 230, second insulating gasket 240, and the side wall of the housing 100. The multiple connectors pass through the multiple mounting through holes on the inner pole 220, second insulating gasket 240, housing 100, first insulating gasket 230, and outer pole 210 in sequence to fix the inner pole 220 and outer pole 210 to the side wall of the housing 100, electrically connect the inner pole 220 and outer pole 210, and electrically connect the inner pole 220 and outer pole 210 to each other through the connectors 250.

[0077] In this embodiment of the invention, the connector 250, while pressing and fixing the outer pole post 210 and the inner pole post 220, as well as the first insulating pad 230 and the second insulating pad 240 between them, onto the side wall of the housing 100, also connects the inner pole post 220 and the outer pole post 210, thereby connecting the electrical connection portion 410 of the multiple core stacks 400 with the two outer pole posts 210 of the battery cell. That is, it simultaneously realizes the fixed connection between the outer pole post 210 and the inner pole post 220 and the electrical connection between them.

[0078] Considering that battery cells may be subjected to high-frequency vibrations during use in electric vehicles, to ensure the stability of the connections between the internal structures of the battery cells, as a preferred embodiment of the present invention, such as... Figure 1 , Figure 7 As shown, connector 250 is a rivet.

[0079] Preferably, such as Figure 7 As shown, the size of the mounting through hole on the side wall of the housing 100 is larger than the size of the mounting through hole on the first insulating gasket 230. Therefore, when the connector 250 (rivet) is driven into the multiple mounting through holes, the material around the mounting through hole of the first insulating gasket 230 can be pressed into the mounting through hole of the housing 100, thereby ensuring the insulation effect between the connector 250 and the side wall of the mounting through hole of the housing 100.

[0080] As an optional embodiment of the present invention, such as Figure 1 , Figure 7 As shown, the pole assembly 200 also includes an insulating pad 260, which is disposed between the inner pole 220 and the corresponding second main body 311 to prevent the second main body 311 from bumping or short-circuiting with the inner pole 220.

[0081] As an optional embodiment of the present invention, such as Figure 7 As shown, the outer pole post 210 includes an assembly plate 211 and a contact head 212 located on the assembly plate 211. The assembly plate 211 has a plurality of mounting through holes. The contact head 212 extends in a horizontal direction parallel to the side wall of the corresponding side. The contact head 212 includes a fixing part 212a and two gripping parts 212b. The end of the fixing part 212a facing the core stack 400 is fixedly connected to the assembly plate 211. The end of the gripping part 212b facing the core stack 400 is fixedly connected to the end of the fixing part 212a away from the core stack 400. The ends of the two gripping parts 212b away from the core stack 400 are vertically spaced apart, and the distance between them is less than the maximum vertical distance between the two gripping parts 212b.

[0082] That is, the distance between the ends of the two gripper portions 212b is less than the maximum size of the object that can be accommodated between them, so that the two gripper portions 212b can hook onto other objects (e.g., rod-shaped electrodes), so that the contact head 212 is tightly connected to other objects, thereby ensuring the stability of the battery cell installation.

[0083] As a third aspect of the present invention, a method for manufacturing a battery cell is provided, for manufacturing the battery cell provided in the embodiments of the present invention, the method for manufacturing the battery cell comprising:

[0084] Step S1: Sequentially connect the electrical connection portions 410 on both sides of each core stack 400 to the corresponding electrode connection portions 320 at the height of the two core adapter pieces 300 along the height direction. When connecting each electrode connection portion 320 to the corresponding electrical connection portion 410, rotate the remaining electrode connection portions 320 that are not connected to the electrical connection portion 410 to move them away from the electrode connection portion 320 that is currently to be connected to the electrical connection portion 410.

[0085] Step S2: Place the core stack 400 and the two cell adapter pieces 300 connected thereto in the housing 100, so that the two pole connection parts 310 are electrically connected to the pole assembly 200 on the corresponding side respectively.

[0086] The battery cell manufacturing method provided by this invention is implemented using the battery cell adapter 300 provided in this embodiment. The battery cell adapter 300 includes a terminal connection portion 310 and multiple electrode connection portions 320. One end of the electrode connection portion 320 is connected to the terminal connection portion 310 and can rotate relative to the terminal connection portion 310 about a vertical axis. Therefore, in step S1 of fixing each core stack 400 using the battery cell adapter 300, the angle between the electrode connection portion 320 and the terminal connection portion 310 can be freely adjusted. When fixing each electrode connection portion 320 to the core stack 400 of the corresponding height, the remaining electrode connection portions 320 can be adjusted. 20. Rotate to avoid the electrode connection 320 that is currently being installed, expand the installation operation (e.g., welding) space between the current electrode connection 320 and the core stack 400, thereby reducing the difficulty of manufacturing and maintaining the battery cell. In addition, the connection between the pole post connection 310 and each electrode connection 320 only allows the electrode connection 320 to rotate in the horizontal direction. Thus, the pole post connection 310 on both sides can stably support each core stack 400 through the electrode connection 320, ensuring the stability of the internal structure of the battery cell. This can effectively avoid problems such as short circuits caused by loosening of the core stack and improve the safety of battery cell use.

[0087] To accommodate situations where the orientations of the ends of multiple electrode connection portions 320 connected to the pole post connection portion 310 are staggered along the height direction, as an optional embodiment of the present invention, in step S1, before fixing each electrode connection portion 320 to the corresponding electrical connection portion 410, the electrode connection portion 320 to be connected is rotated to be parallel to the pole post connection portion 310 (the second main body portion 311).

[0088] It should be noted that the order in which the core stack 400 is installed along its height is related to the orientation of the first connecting platform on the first contact portion 322. For example, if the bottom surface of the first contact portion 322 is the first connecting platform (i.e., ... Figure 7 As shown in the diagram, the core stacks 400 are installed sequentially from top to bottom. Thus, when installing each core stack 400, the first connecting platform of the corresponding first contact portion 322 faces away from the installed core stack 400, allowing all uninstalled electrode connecting portions 320 to freely rotate away from the current installation area. Similarly, if the top surface of the first contact portion 322 is the first connecting platform, the core stacks 400 are installed sequentially from bottom to top.

[0089] To further improve the convenience of manufacturing and maintaining battery cells, as a preferred embodiment of the present invention, such as... Figure 2 , Figure 7As shown, the electrode connection portion 310 includes a vertically arranged second main body portion 311 and a horizontally arranged second contact portion 312. The electrode connection portion 320 is connected to the second main body portion 311. One side of the second contact portion 312 is fixedly connected to the top of the second main body portion 311, and the other side of the second contact portion 312 extends away from the core stack 400. The bottom surface of the second contact portion 312 is formed as a second connection platform. The second connection platform is used to make electrical contact with and fix the top of the corresponding inner electrode 220. Step S3 specifically includes:

[0090] Multiple core stacks 400 and two cell adapter pieces 300 connected thereto are disposed in the housing 100, so that the second connecting platforms of the second contact portions 312 of the two pole post connecting portions 310 are respectively in electrical contact with the top end of the corresponding inner pole post 220.

[0091] Each pole post connector 310 is welded to the corresponding inner pole post 220.

[0092] In this embodiment of the invention, the tops of both electrode connection portions 310 have outwardly projecting second contact portions 312, which make electrical contact with the inner electrode 220. Therefore, when manufacturing the battery cell, the second contact portions 312 can be used as a positioning structure when the (stacked) core stack 400 with cell adapter pieces 300 mounted on both sides is placed into the housing body 120. Figure 7 As shown, the inner pole post 220 is a rigid part (that is, its shape will not easily change when bearing the weight of objects such as the core stack). The top of the inner pole post 220 remains in a fixed position relative to the housing body 120. Thus, by placing the second contact part 312 on the top of the inner pole posts 220 on both sides, the core stack 400 can be positioned and supported, which greatly improves the convenience of manufacturing and maintaining the battery cell and the stability of the internal structure of the battery cell.

[0093] As an optional embodiment of the present invention, such as Figure 1 As shown, the housing 100 includes a housing cover 110 and a housing body 120. In step S3, the (stacked) core stack 400 with the cell adapter pieces 300 installed on both sides, which was made in step S2, is placed into the housing body 120, and then the housing cover 110 is put on.

[0094] Considering that the battery cell may be subjected to high-frequency vibrations during use when it is applied to electric vehicles, in order to ensure the stability of the connection between the internal structures of the battery cell, as a preferred embodiment of the present invention, the second contact portion 312 is welded to the top of the corresponding inner pole post 220 and the first contact portion 322 is welded to the electrical connection portion 410 of the core stack 400 (for example, by spot welding).

[0095] As an optional embodiment of the present invention, the method further includes the step of installing pole post assemblies 200 on both side walls of the housing body 120. Specifically, this step includes: pressing the mounting plate 211 of the outer pole post 210 and the first insulating gasket 230 between it and the outer side wall of the housing body 120 onto the outer side wall of the housing body 120, and pressing the inner pole post 220 and the second insulating gasket 240 between it and the inner side wall of the housing body 120 onto the inner side wall of the housing body 120, and making the mounting through holes on these components correspondingly connected; and pressing and fixing the outer pole post 210, the inner pole post 220, the first insulating gasket 230 and the second insulating gasket 240 onto the side wall of the housing 100 by connecting members 250 that pass through these mounting through holes one by one.

[0096] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. An electrode tab for an electrode, the electrode tab comprising: The battery cell includes a housing, a pair of terminal post assemblies, multiple core stacks, and a pair of battery cell adapter pieces; the battery cell adapter piece includes a terminal post connection portion and multiple electrode connection portions, one end of the electrode connection portion in the horizontal direction is connected to the terminal post connection portion, so that the electrode connection portion can rotate relative to the terminal post connection portion about the connection point in the horizontal direction, and the multiple electrode connection portions are spaced apart in the height direction; The electrode connection portion has a plurality of horizontally extending strip-shaped holes, the height of the plurality of electrode connections corresponds one-to-one with the height of the plurality of strip-shaped holes, and when the electrode connection portion is rotated to be parallel to the electrode connection portion, the electrode connection portion at least partially enters the corresponding strip-shaped hole; The electrode connection portion includes a first main body portion and a first contact portion. One end of the first main body portion is connected to the electrode post connection portion in a horizontal direction. One side of the first contact portion is fixedly connected to the first main body portion. The other side of the first contact portion extends in a direction toward the core stack. The top or bottom surface of the first contact portion is formed as a first connection platform. The first connection platform is electrically connected to the corresponding electrical connection portion of the core stack. The electrode assembly includes an inner electrode disposed inside the housing; the electrode connection portion includes a second main body portion and a second contact portion, the electrode connection portion is connected to the second main body portion, one side of the second contact portion is fixedly connected to the second main body portion, the other side of the second contact portion extends away from the core stack, the bottom surface of the second contact portion is formed as a second connection platform, and the second connection platform is electrically contacted and fixedly connected to the top end of the corresponding inner electrode.

2. The cell tab of claim 1, wherein, The connection position of each electrode connection part to the pole post connection part is different from the connection position of the adjacent electrode connection part to the pole post connection part.

3. The cell tab of claim 1, wherein, The electrode connection portion and the pole post connection portion are integrated.

4. An electric cell characterized by The battery cell includes a housing, a pair of terminal post assemblies, a plurality of core stacks, and a pair of battery cell adapter pieces as described in any one of claims 1 to 3. The two terminal post assemblies are respectively disposed on two opposite side walls of the housing, the core stacks are disposed between the two terminal post assemblies, and the two battery cell adapter pieces are disposed one-to-one between each terminal post assembly and each core stack. The electrode connection portion of each cell adapter piece is electrically connected to the corresponding side of the cell stack at the corresponding height, and the pole connection portion is electrically connected to the pole assembly on the corresponding side, so that the electrical connection portions on both sides of the cell stack are electrically connected to the pole assemblies on both sides through the two cell adapter pieces.

5. The electric cell of claim 4, wherein, An angle is formed between the first main body portion and the first contact portion.

6. The electric cell of claim 5, wherein, The electrical connection portions on both sides of the core stack are empty foils.

7. The electric cell of claim 4, wherein, The electrode assembly also includes an outer electrode fixed to the outside of the housing, and the outer electrode is electrically connected to the inner electrode.

8. The cell of any one of claims 4 to 7, wherein, The housing includes a housing body and at least one housing cover. The housing body has two opposing top walls, and at least one of the top walls has an inlet for the core stack to enter the housing body. The housing cover closes the inlet one by one. The surface area of ​​the top wall is larger than the surface area of ​​the other sides of the housing body.

9. The electric cell of claim 7, wherein, The pole assembly further includes a first insulating pad and a second insulating pad, the first insulating pad being disposed between the outer pole and the side wall of the housing, and the second insulating pad being disposed between the inner pole and the side wall of the housing.

10. The electric cell of claim 9, wherein, The electrode assembly further includes multiple connectors. Multiple mounting through holes are formed on the outer electrode, the inner electrode, the first insulating gasket, the second insulating gasket, and the side wall of the housing. The multiple connectors pass through the multiple mounting through holes on the inner electrode, the second insulating gasket, the housing, the first insulating gasket, and the outer electrode in a corresponding manner to fix the inner electrode and the outer electrode on the side wall of the housing and to electrically connect the inner electrode and the outer electrode to each other through the connectors.

11. The electric cell of claim 10, wherein, The connector is a rivet.

12. A method for manufacturing a battery cell, characterized in that, A method for manufacturing a battery cell according to any one of claims 4 to 11, comprising: Along the height direction, the electrical connection parts on both sides of each core stack are fixedly connected to the electrode connection parts at the corresponding heights of the two core adapter pieces. When fixing each electrode connection part to the corresponding electrical connection part, the remaining electrode connection parts that are not connected to the electrical connection parts are rotated away from the electrode connection parts that are currently to be fixedly connected to the electrical connection part. The core stack and the two cell adapter pieces connected to it are disposed in the housing, so that the two pole connection parts are electrically connected to the pole assembly on the corresponding side respectively.

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