Lower plastic plate, cover plate assembly and battery

Abstract

The application relates to the technical field of lithium batteries, in particular to a lower plastic plate, a cover plate assembly and a battery. The lower plastic plate comprises a body, a first limiting assembly and a second limiting assembly, the first limiting assembly is arranged on the body, the first limiting assembly is used for limiting the first connecting sheet, and the first connecting sheet is used for electrically connecting with the first position; the second limiting assembly is arranged on the body, the second limiting assembly is used for limiting the second connecting sheet, and the second connecting sheet is used for electrically connecting with the second position. The lower plastic plate connects the first connecting sheet or the second connecting sheet through the first limiting assembly and the second limiting assembly, that is, the lower plastic plate can be adapted to two different structural battery cell assemblies, the compatibility of the lower plastic plate for the two battery cell assemblies is improved, the application range of the lower plastic plate is expanded, two sets of molds are not needed to produce different lower plastic plate structures, and cost reduction is facilitated.

Description

Technical Field

[0001] This application relates to the field of lithium battery technology, and in particular to the lower plastic plate, cover plate assembly and battery. Background Technology

[0002] Lithium batteries typically include laminated and wound types. Wound lithium batteries have two types of tabs: one type has both the positive and negative tabs located on the end face of the core facing the cover assembly, with the connecting tabs on the cover assembly corresponding to the positive and negative tabs; the other type has the positive and negative tabs located on both sides of the core, and after the tabs are wound, this area is directly welded to the connecting tabs on the cover assembly to form a full-tab battery. The connecting tabs on the cover assembly have extensions that extend to both sides of the core to facilitate contact with the tabs.

[0003] In related technologies, the connecting pieces of the cover plate assembly are also set accordingly for the different electrode structures mentioned above. Therefore, at least two sets of cover plate assemblies with different structures need to be set. The two cover plate assemblies are designed and molded separately, which increases the cost and maintenance expenses of the cover plate assembly. Summary of the Invention

[0004] Therefore, it is necessary to provide a cover plate assembly and a battery to solve the above technical problems.

[0005] A lower plastic plate for assembling a battery with a cell assembly, a first connecting piece, or a second connecting piece;

[0006] The battery cell assembly has a first position and a second position. The first position is the end face of the battery cell assembly facing the lower plastic plate, and the second position is the two sides of the battery cell assembly along a first direction, which is the length direction of the lower plastic plate.

[0007] The lower plastic sheet includes:

[0008] ontology;

[0009] A first limiting component is disposed on the body, the first limiting component being used to limit the first connecting piece, the first connecting piece being used for electrical connection with the first position; and

[0010] A second limiting component is disposed on the main body. The second limiting component is used to limit the second connecting piece, and the second connecting piece is used to electrically connect with the second position.

[0011] The lower plastic plate, through the first limiting component and the second limiting component, connects to the first connecting piece or the second connecting piece, thus enabling it to adapt to two different battery cell components. This improves the compatibility of the lower plastic plate with the two types of battery cell components, thereby expanding the applicability of the lower plastic plate. It also eliminates the need for two sets of molds to produce different lower plastic plate structures, which helps to reduce costs.

[0012] In one embodiment, the first limiting component includes:

[0013] Two sets of first limiting members are disposed opposite each other along a first direction on the side of the body facing the cell assembly. Each set of first limiting members corresponds to the first connecting piece. The first limiting members are configured to constrain the position of the first connecting piece along the first direction and a second direction, wherein the second direction is perpendicular to the first direction.

[0014] In order to ensure that the position of the first connecting piece can be electrically connected with the electrode at the first position, the positions of the two first connecting pieces are limited by the first limiting member to ensure that the installation position of the first connecting piece is within the preset error range, thereby improving the accuracy of the relative position of the first connecting piece and the electrode at the first position.

[0015] In one embodiment, the first connecting piece is provided with a limiting groove, and each set of the first limiting members includes:

[0016] At least one limiting protrusion is located at least partially in the limiting groove, thereby using the cooperation between the limiting protrusion and the limiting groove to limit the installation position of the first connecting piece, so as to ensure that the installation position of the first connecting piece is within a preset error range, thereby improving the accuracy of the relative position of the first connecting piece and the electrode tab.

[0017] In one embodiment, the second limiting component includes:

[0018] Two sets of second limiting members are disposed opposite each other along a first direction on the side of the body facing the cell assembly, and the second limiting members are configured to constrain the installation position of the second connecting piece.

[0019] Two sets of second limiting members are respectively set with two second connecting pieces to constrain the installation position of the second connecting pieces, so that the installation position of the second connecting pieces can be electrically connected with the electrode located in the second position, thereby ensuring that the installation position of the second connecting pieces is within the preset error range, and thus improving the accuracy of the relative position of the second connecting pieces and the electrode located in the second position.

[0020] In one embodiment, the second connecting piece is provided with a limiting hole, and the second limiting member includes:

[0021] The limiting posts of the two sets of second limiting members are arranged near the two ends of the body along the first direction, and the limiting posts are inserted into the limiting holes.

[0022] The cooperation between the limiting post and the limiting hole helps to improve positioning accuracy, so as to ensure the accuracy of the assembly position of the second connecting piece on the body, achieve almost error-free installation, and provide a foundation for subsequent electrode tab welding.

[0023] In one embodiment, the lower plastic sheet further includes:

[0024] Two sets of heat dissipation components are arranged near the two ends of the body along the first direction. The heat dissipation components are used to support the second connecting piece, so that a heat dissipation gap is maintained between the second connecting piece and the body.

[0025] This heat dissipation gap increases the contact area between the second connecting piece and the air. When operating at high current, it can serve as a heat dissipation channel, helping the second connecting piece and the electrode welding area to cool down quickly, thereby improving the rate performance and safety of the battery.

[0026] In one embodiment, the heat sink includes:

[0027] Multiple ribs are arranged parallel to each other along a first or second direction and spaced apart. The gaps between the ribs form heat dissipation gaps, increasing the contact area between the second connecting piece and the air. When operating at high current, they can serve as heat dissipation channels to help the second connecting piece and the electrode welding area cool down quickly, thereby improving the rate performance and safety of the battery.

[0028] In one embodiment, the lower plastic plate further includes two soldering stations disposed on the side of the body facing the battery cell assembly. The two soldering stations are respectively used to connect with the two first connecting pieces, or the two soldering stations are respectively used to connect with the two second connecting pieces. The height of the heat sink is the same as the height of the soldering stations, so as to ensure that the heat sink and the soldering stations together serve as a supporting plane for the second connecting pieces, thereby improving the welding quality of the second connecting pieces.

[0029] In one embodiment, the lower plastic plate further includes two soldering stations, one of which is provided with a foolproof mark to facilitate the identification of the positive and negative terminals when assembling the first or second connecting piece. This ensures that the connecting pieces of the positive and negative terminals can only be installed in the single correct manner, physically eliminating the possibility of reverse installation and improving the accuracy and safety of assembly.

[0030] A cover plate assembly, comprising:

[0031] main body;

[0032] The lower plastic plate, as described above, is connected to the side of the main body facing the battery cell assembly;

[0033] Two first connecting pieces are correspondingly disposed with the first limiting component of the lower plastic plate; or,

[0034] Two second connecting pieces are provided, and the two second connecting pieces are correspondingly set with the second limiting component of the lower plastic plate.

[0035] This cover plate assembly adapts to different first or second connecting pieces using the same lower plastic plate, enabling it to be compatible with two different battery cell assemblies. This improves the compatibility of the lower plastic plate with the two battery cell assemblies, thereby expanding the applicability of the lower plastic plate. It also eliminates the need for two sets of molds to produce different lower plastic plate structures, which helps reduce costs.

[0036] A battery comprising:

[0037] The cover plate assembly as described above; and

[0038] A battery cell assembly has a first position and a second position. The first position is the end face of the battery cell assembly facing the cover plate assembly, and the second position is both sides of the battery cell assembly along a first direction. The battery cell assembly includes tabs, which are disposed at the first position or the second position. The cover plate assembly is electrically connected to the tabs at the first position, or the cover plate assembly is electrically connected to the tabs at the second position.

[0039] This battery adapts to different first or second connecting pieces using the same lower plastic plate, enabling it to be compatible with two different cell assemblies. This improves the compatibility of the lower plastic plate with the two cell assemblies, thereby expanding the applicability of the lower plastic plate. It also eliminates the need for two sets of molds to produce different lower plastic plate structures, which helps reduce costs. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of a battery provided in one embodiment of this application.

[0041] Figure 2 This is a schematic diagram of the assembly structure of the cover plate assembly and the battery cell assembly provided in one embodiment of this application.

[0042] Figure 3 This is a schematic diagram of the assembly structure of the cover plate assembly and the first connecting piece provided in one embodiment of this application.

[0043] Figure 4 This is a schematic diagram of the assembly structure of the cover plate assembly and the second connecting piece provided in one embodiment of this application.

[0044] Figure 5 This is an exploded view of the cover plate assembly provided in one embodiment of this application.

[0045] Figure 6 This is a partial structural diagram of the lower plastic plate provided in one embodiment of this application.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1000 - Cover plate assembly;

[0048] 100-lower plastic sheet;

[0049] 110 - Body; 120 - First limiting component; 121 - First limiting element; 130 - Second limiting component; 131 - Second limiting element; 1311 - Limiting post; 140 - Explosion-proof boss; 150 - Heat sink; 151 - Rib; 160 - Soldering station; 161 - Foolproof mark;

[0050] 200-substrate;

[0051] 2000 - Battery cell assembly; 2001 - Core;

[0052] 3000 - First connecting piece; 3001 - Limiting groove;

[0053] 4000 - Second connecting piece; 3002 - Limiting hole. Detailed Implementation

[0054] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0055] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0056] Furthermore, where 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 number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0058] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0059] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening 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 intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0060] See Figures 1-2 , Figure 1 A schematic diagram of the structure of a battery provided in one embodiment of this application is shown. Figure 2 This illustration shows an assembly structure diagram of the cover plate assembly 1000 and the cell assembly 2000 provided in one embodiment of this application.

[0061] like Figure 1 and Figure 2As shown, this embodiment provides a battery including a cell assembly 2000 and a cover assembly 1000. The cell assembly 2000 and the cover assembly 1000 are disposed opposite to each other, so that the cover assembly 1000 covers the cell assembly 2000. Exemplarily, the battery in this embodiment is a prismatic lithium battery.

[0062] Specifically, the cell assembly 2000 is configured with a first position and a second position. The first position is the end face of the cell assembly 2000 facing the cover assembly 1000, and the second position is the two sides of the cell assembly 2000 along a first direction, which is the length direction of the cover assembly 1000.

[0063] The battery cell assembly 2000 includes a core 2001 and a tab. The core 2001 and the tab are connected. The tab is set in a first position or a second position of the battery cell assembly 2000. The first position and the second position are two different types of tab setting methods, and the two tab setting positions are usually incompatible.

[0064] When the tab is in the first position, after the core 2001 and the tab are connected, the tab is bent by folding the core 2001. At this time, the tab is located on the end face of the core 2001 facing the cover plate assembly 1000. Specifically, there are two tabs: one tab is connected to the positive terminal of the core 2001, which is the positive tab, and the other tab is connected to the negative terminal of the core 2001, which is the negative tab. Both the positive and negative tabs are located on the end cap of the core 2001 facing the cover plate assembly 1000.

[0065] Another structure is that the electrode tabs are set in the second position, that is, on the two sides of the core 2001 along the first direction, a positive electrode tab is set on one side and a negative electrode tab is set on the other side.

[0066] The cover plate assembly 1000 is used for electrical connection with the tab at a first position, or the cover plate assembly 1000 is used for electrical connection with the tab at a second position.

[0067] The first and second electrode tabs are connected to the core 2001 by selectively setting one of them, and the two structures correspond to different square lithium battery structures. Furthermore, in related technologies, the cover assembly 1000 with the two electrode tab settings is not interchangeable.

[0068] like Figure 3 As shown, corresponding to the two cell assembly 2000 structures described above, the cover plate assembly 1000 includes a main body, a lower plastic plate 100, and a first connecting piece 3000. The lower plastic plate 100 is connected to the side of the main body facing the cell assembly 2000. The first connecting piece 3000 is used for electrical connection with the tab at the first position.

[0069] like Figure 4As shown, or, the cover assembly 1000 includes a body, a lower plastic plate 100, and a second connecting piece 4000. The second connecting piece 4000 is used for electrical connection with the tab at a second position.

[0070] There are two first connecting pieces 3000, each electrically connected to one of the two tabs located in the first position. There are also two second connecting pieces 4000, each connected to one of the two tabs located in the second position.

[0071] like Figure 5 As shown, in one embodiment, the lower plastic plate 100 includes a body 110 and two soldering stations 160. The two soldering stations 160 are disposed opposite each other along a first direction on the side of the body 110 facing the cell assembly 2000. The two soldering stations 160 are respectively connected to the first connecting piece 3000 in a one-to-one correspondence, or the two soldering stations 160 are respectively connected to the second connecting piece 4000 in a one-to-one correspondence. The two soldering stations 160 are a positive electrode soldering station 160 and a negative electrode soldering station 160.

[0072] When assembling the first connecting piece 3000 or the second connecting piece 4000, it is usually welded to the soldering station 160. Specifically, the first connecting piece 3000 or the second connecting piece 4000 is welded to the soldering station 160 by laser welding.

[0073] Furthermore, one of the two soldering stations 160 is provided with a foolproof mark 161 to facilitate the identification of the positive and negative terminals when assembling the first connecting piece 3000 or the second connecting piece 4000. This ensures that the positive and negative connecting pieces can only be installed in the single correct way, physically eliminating the possibility of reverse installation and improving the accuracy and safety of assembly.

[0074] For example, the foolproof mark 161 is a groove, which is provided on the edge of one of the positive electrode soldering station 160 and the negative electrode soldering station 160, so that it is different from the other soldering station 160.

[0075] The first connecting piece 3000 is a sheet-like structure, with its side surface attached to the soldering station 160. The second connecting piece 4000 can be an L-shaped structure, comprising an L-shaped welding arm and an electrical connecting arm. The welding arm is welded to the soldering station 160 with its side facing away from the electrical connecting arm, while the electrical connecting arm extends away from the soldering station 160. The two second connecting pieces 4000 are arranged opposite to each other, and their two electrical connecting arms extend on both sides of the core 2001 along a first direction, respectively, and contact the tabs located at second positions on both sides of the core 2001, thus achieving electrical connection with the tabs.

[0076] For example, both the first connecting piece 3000 and the second connecting piece 4000 are formed by stamping and bending of metal sheets.

[0077] like Figure 5 and Figure 6 As shown, in one embodiment, the lower plastic plate 100 further includes a first limiting component 120 and a second limiting component 130. The first limiting component 120 is disposed on the body 110 and is used to limit the first connecting piece 3000. The second limiting component 130 is disposed on the body 110 and is used to limit the second connecting piece 4000. Through the first limiting component 120 and the second limiting component 130, the lower plastic plate 100 connects to either the first connecting piece 3000 or the second connecting piece 4000, thus adapting to two different battery cell assemblies 2000 structures. This improves the compatibility of the lower plastic plate 100 with the two battery cell assemblies 2000, thereby expanding the applicability of the lower plastic plate 100. It also eliminates the need for two sets of molds to produce different lower plastic plate 100 structures, which helps reduce costs.

[0078] In use, although the first limiting component 120 and the second limiting component 130 are set simultaneously, only one of the first limiting component 120 and the second limiting component 130 of the lower plastic plate 100 is used, depending on the type of battery cell assembly 2000 that the cover plate assembly 1000 is adapted to. With this lower plastic plate 100, only one universal mold needs to be made for two different battery cell assembly 2000 structures to produce the same lower plastic plate 100, directly halving the investment cost and fundamentally reducing costs. In use, the operator only needs to select the corresponding first connecting piece 3000 or second connecting piece 4000 according to the different battery cell assembly 2000 structures. The operation is simple, eliminating the need for separate molds for two different battery cell assembly 2000 structures, which helps reduce production costs. Meanwhile, through the lower plastic sheet 100 in this embodiment, the two originally independent lower plastic sheet 100 material systems are integrated into a shared platform with a universal lower plastic sheet 100 as the core, realizing a high degree of material reuse and compatibility. Operators do not need to manage different cover plate components 1000 for different structured battery cell components 2000, which helps to reduce warehousing costs, reduce warehousing management work, reduce the complexity of procurement and warehousing and capital occupation. Moreover, by improving the compatibility of the lower plastic sheet 100, it helps to reduce the amount of stagnant materials caused by demand fluctuations, reduce operating costs and the risk of incorrect materials.

[0079] In existing technologies, separate lower plastic sheets 100 need to be produced for two different types of battery cell modules 2000. If two separate production lines are used for the lower plastic sheets 100, production costs increase significantly. If the two structures share the same production line, switching between different lower plastic sheets 100 requires stopping the line to change materials or even tooling, making rapid and flexible production scheduling impossible. This embodiment, however, uses a single set of lower plastic sheets 100 that is compatible with two different battery cell module structures 2000, eliminating the need for production line switching, significantly improving production flexibility and efficiency, and reducing production costs.

[0080] For example, the lower plastic sheet 100 is an insulating material, serving an insulating function. For example, the lower plastic sheet 100 is a high-temperature resistant insulating material such as PP.

[0081] For example, the lower plastic sheet 100 is an injection-molded structure, and only one set of universal lower plastic sheet 100 needs to be produced using this material.

[0082] With this structure, when producing a battery with the tabs positioned in the first position, the operator uses this universal lower plastic plate 100 and installs the first connecting piece 3000 at the position of the first limiting assembly 120. When producing a battery with the tabs positioned in the second position, the operator still uses the universal lower plastic plate 100, but simply installs the second connecting piece 4000 at the position of the second limiting assembly 130.

[0083] This solution achieves 100% universality for the lower plastic plate 100, which is the most expensive and structurally complex in the existing technology. It only requires stockpiling one type of lower plastic plate 100 and two relatively simple and inexpensive metal first connecting piece 3000 and second connecting piece 4000 to meet the production needs of two different battery structures.

[0084] In one embodiment, the first limiting component 120 includes two sets of first limiting members 121. The first limiting members 121 are disposed on the side of the body 110 facing the cell assembly 2000. The two sets of first limiting members 121 are arranged opposite each other along a first direction. Each set of first limiting members 121 corresponds one-to-one with a first connecting piece 3000, and the first limiting members 121 are configured to constrain the position of the first connecting piece 3000 along a first direction and a second direction, with the second direction perpendicular to the first direction. In order to ensure that the position of the first connecting piece 3000 can be electrically connected to the electrode located at the first position, the positions of the two first connecting pieces 3000 are limited by the first limiting members 121 respectively, so as to ensure that the installation position of the first connecting piece 3000 is within a preset error range, thereby improving the accuracy of the relative position of the first connecting piece 3000 and the electrode located at the first position.

[0085] In one embodiment, the lower plastic plate 100 further includes an explosion-proof boss 140, which is disposed close to the center of the body 110 along a first direction, thereby improving the safety performance of the battery.

[0086] like Figure 5 and Figure 6 As shown, in one embodiment, the first connecting piece 3000 is provided with a limiting groove 3001, and each set of first limiting members 121 includes at least one limiting protrusion. The limiting protrusion is at least partially located in the limiting groove 3001, thereby using the cooperation between the limiting protrusion and the limiting groove 3001 to limit the installation position of the first connecting piece 3000, so as to ensure that the installation position of the first connecting piece 3000 is within a preset error range, thereby improving the accuracy of the relative position between the first connecting piece 3000 and the tab.

[0087] Furthermore, the limiting groove 3001 is a strip-shaped groove extending along the first direction, and the limiting protrusion protrudes from the body 110 and is located in the strip-shaped groove. Optionally, the limiting protrusion is a strip-shaped structure, and the extending direction of the strip-shaped limiting protrusion is the same as the extending direction of the limiting groove 3001. This allows the position of the limiting protrusion to not only constrain the position of the first connecting piece 3000 along the first and second directions, but also constrain the rotation angle of the first connecting piece 3000, keeping the first connecting piece 3000 extending along the first direction and preventing the first connecting piece 3000 from shifting or rotating.

[0088] In one embodiment, each group of first limiting members 121 may have multiple limiting protrusions, which are spaced apart along the first direction and located in the limiting groove 3001, thereby improving the stability of the limiting effect of the limiting protrusions on the first connecting piece 3000.

[0089] For example, in this embodiment, the limiting groove 3001 of the first connecting piece 3000 is located on the side close to the explosion-proof boss 140, and the limiting protrusion on the body 110 is also located close to the explosion-proof boss 140, so that the limiting protrusion corresponds to the position of the limiting groove 3001, thereby achieving the purpose of limiting.

[0090] In one embodiment, the second limiting component 130 includes two sets of second limiting members 131, which are disposed opposite to each other along a first direction. The second limiting members 131 are configured to constrain the installation position of the second connecting piece 4000. The two sets of second limiting members 131 are respectively disposed with the two second connecting pieces 4000 to constrain the installation position of the second connecting piece 4000, so that the installation position of the second connecting piece 4000 can be electrically connected to the electrode located at the second position, thereby ensuring that the installation position of the second connecting piece 4000 is within a preset error range, and thus improving the accuracy of the relative position between the second connecting piece 4000 and the electrode located at the second position.

[0091] Specifically, the second connecting piece 4000 is provided with a limiting hole 3002, and the second limiting member 131 includes a limiting post 1311. The limiting post 1311 is disposed on the body 110, and the limiting posts 1311 of the two sets of second limiting members 131 are disposed near the two ends of the body 110 along the first direction, and the limiting posts 1311 are inserted into the limiting hole 3002. The cooperation between the limiting post 1311 and the limiting hole 3002 helps to improve the positioning accuracy, so as to ensure the accuracy of the assembly position of the second connecting piece 4000 on the body 110, achieve almost error-free installation, and provide a basis for subsequent electrode tab welding. Specifically, the limiting post 1311 is located at one end of the two welding stations 160 that are opposite to each other.

[0092] Furthermore, each set of second limiting members 131 includes at least two limiting posts 1311, which are spaced apart along the second direction. The two limiting posts 1311 cooperate with the two limiting holes 3002, which can effectively improve the assembly accuracy and prevent rotation or displacement of the assembly position of the second connecting piece 4000.

[0093] The height of the limiting post 1311 is higher than that of the welding station 160, so that when the second connecting piece 4000 is set on the welding station 160, the limiting post 1311 can still be at least partially inserted into the limiting hole 3002 on the second connecting piece 4000.

[0094] In one embodiment, the lower plastic plate 100 further includes two sets of heat sinks 150. The two sets of heat sinks 150 are disposed near both ends of the body 110 along a first direction. The heat sinks 150 support the second connecting piece 4000, maintaining a heat dissipation gap between the second connecting piece 4000 and the body 110. This heat dissipation gap increases the contact area between the second connecting piece 4000 and the air, and can serve as a heat dissipation channel during high-current operation, helping the second connecting piece 4000 and the electrode welding area to cool down quickly, thereby improving the battery's rate performance and safety.

[0095] Furthermore, the heat sink 150 includes a plurality of ribs 151, which are parallel and spaced apart along a first or second direction. The gaps between the ribs 151 form a heat dissipation gap, increasing the contact area between the second connecting piece 4000 and the air. When operating at high current, it can serve as a heat dissipation channel to help the second connecting piece 4000 and the electrode welding area cool down quickly, thereby improving the rate performance and safety of the battery.

[0096] For example, the protruding ribs 151 can be located on opposite sides of the two welding stations 160, and there can be multiple protruding ribs 151. When the protruding ribs 151 are arranged parallel and spaced apart along the first direction, the protruding ribs 151 extend along the second direction, and the length of the multiple protruding ribs 151 is correspondingly set to the width of the body 110 along the second direction. The length of the protruding ribs 151 can be slightly less than the width of the body 110 along the second direction, or the length of the protruding ribs 151 is not less than the width of the second connecting piece 4000 along the second direction, so as to provide sufficient support and heat dissipation gap for the second connecting piece 4000. At the same time, at least one protruding rib 151 can also be provided between the two limiting posts 1311. When the protruding ribs 151 are arranged parallel and spaced apart along the second direction, the protruding ribs 151 extend along the first direction, that is, the length direction of the protruding ribs 151 is the first direction, and the length of the protruding ribs 151 is correspondingly set to the distance from the welding station 160 to both ends of the body 110. Furthermore, at the position between the two limiting posts 1311, the length of the protruding rib 151 is increased, allowing it to extend into the gap between the limiting posts 1311.

[0097] Meanwhile, during the welding of the second connecting piece 4000, it is partially located at the welding station 160 and partially located above the heat sink 150. This allows the heat sink 150 to not only dissipate heat but also provide support for the second connecting piece 4000, providing a solid horizontal support surface for the second connecting piece 4000. This ensures the flatness of the second connecting piece 4000 during the welding process, which is crucial for guaranteeing welding quality.

[0098] Specifically, the height of the heat sink 150 is the same as the height of the soldering station 160, so as to ensure that the heat sink 150 and the soldering station 160 together serve as a support plane for the second connecting piece 4000, thereby improving the welding quality of the second connecting piece 4000.

[0099] Now combined Figure 3 , Figure 5 as well as Figure 6 The assembly process of the battery with the tabs set at the first position is explained:

[0100] like Figure 3 , Figure 5 as well as Figure 6 As shown, when assembling the battery, simply assemble the lower plastic plate 100 onto the substrate 200, then take the first connecting piece 3000 of the positive and negative electrodes, place the first connecting piece 3000 in the designated area of ​​the lower plastic plate 100, and make the limiting groove 3001 correspond to the limiting protrusion to achieve the positioning of the first connecting piece 3000, and then weld the first connecting piece 3000 to the soldering station 160.

[0101] Then, the cover plate assembly 1000 is assembled with the cell assembly 2000, and the positive and negative electrode tabs located in the first position are laser welded to the corresponding positive and negative first connecting pieces 3000.

[0102] Now combined Figures 4-6 The assembly process for a battery with a tab at the second position is explained below:

[0103] like Figures 4-6 As shown, when assembling the battery, simply assemble the lower plastic plate 100 onto the substrate 200, then take the second connecting piece 4000 for the positive and negative electrodes, and align the limiting hole 3002 of the second connecting piece 4000 with the limiting post 1311 on the lower plastic plate 100. At this time, the second connecting piece 4000 is precisely positioned by the limiting post 1311, and the heat sink 150 below provides support for the second connecting piece 4000.

[0104] Then, the cover plate assembly 1000 is assembled with the cell assembly 2000, and the positive and negative electrode tabs located in the second position are laser welded to the corresponding positive and negative second connecting pieces 4000.

[0105] In summary, by using the lower plastic plate 100 in this embodiment, and only replacing the first connecting piece 3000 and the second connecting piece 4000, structural compatibility with two different battery structures is achieved.

[0106] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.

[0107] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A type of lower plastic sheet, characterized in that, Used for assembling batteries with cell assemblies, first connecting pieces, or second connecting pieces; The battery cell assembly has a first position and a second position. The first position is the end face of the battery cell assembly facing the lower plastic plate, and the second position is the two sides of the battery cell assembly along a first direction, which is the length direction of the lower plastic plate. The lower plastic sheet includes: ontology; A first limiting component is disposed on the body, the first limiting component being used to limit the first connecting piece, the first connecting piece being used for electrical connection with the first position; and A second limiting component is disposed on the main body. The second limiting component is used to limit the second connecting piece, and the second connecting piece is used to electrically connect with the second position.

2. The lower plastic sheet according to claim 1, characterized in that, The first limiting component includes: Two sets of first limiting members are disposed opposite each other along a first direction on the side of the body facing the cell assembly. Each set of first limiting members corresponds to the first connecting piece. The first limiting members are configured to constrain the position of the first connecting piece along the first direction and a second direction, wherein the second direction is perpendicular to the first direction.

3. The lower plastic sheet according to claim 2, characterized in that, The first connecting piece is provided with a limiting groove, and each set of the first limiting members includes: At least one limiting protrusion, said limiting protrusion being at least partially located in the limiting groove.

4. The lower plastic sheet according to any one of claims 1-3, characterized in that, The second limiting component includes: Two sets of second limiting members are disposed opposite each other along a first direction on the side of the body facing the cell assembly, and the second limiting members are configured to constrain the installation position of the second connecting piece.

5. The lower plastic sheet according to claim 4, characterized in that, The second connecting piece is provided with a limiting hole, and the second limiting member includes: The limiting posts of the two sets of second limiting members are arranged near the two ends of the body along the first direction, and the limiting posts are inserted into the limiting holes. Alternatively, the lower plastic plate may further include: Two sets of heat dissipation components are arranged near the two ends of the body along the first direction. The heat dissipation components are used to support the second connecting piece, so that a heat dissipation gap is maintained between the second connecting piece and the body.

6. The lower plastic sheet according to claim 5, characterized in that, The heat sink includes: Multiple raised ribs are arranged parallel to each other and spaced apart along a first direction or a second direction.

7. The lower plastic sheet according to claim 5, characterized in that, The lower plastic plate also includes two soldering stations disposed on the side of the body facing the battery cell assembly. The two soldering stations are respectively used to connect with the two first connecting pieces, or the two soldering stations are respectively used to connect with the two second connecting pieces. The height of the heat sink is the same as the height of the soldering stations.

8. The lower plastic sheet according to any one of claims 1-3 and 5-7, characterized in that, The lower plastic plate also includes two welding stations, one of which is equipped with a foolproof marking.

9. A cover plate assembly, characterized in that, include: main body; The lower plastic plate as described in any one of claims 1-8, wherein the lower plastic plate is connected to the side of the main body facing the battery cell assembly; Two first connecting pieces are correspondingly disposed with the first limiting component of the lower plastic plate; or, Two second connecting pieces are provided, and the two second connecting pieces are correspondingly set with the second limiting component of the lower plastic plate.

10. A battery, characterized in that, include: The cover plate assembly as described in claim 9; as well as A battery cell assembly has a first position and a second position. The first position is the end face of the battery cell assembly facing the cover plate assembly, and the second position is both sides of the battery cell assembly along a first direction. The battery cell assembly includes tabs, which are disposed at the first position or the second position. The cover plate assembly is electrically connected to the tabs at the first position, or the cover plate assembly is electrically connected to the tabs at the second position.

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