Battery multi-stack-core structure, assembling method thereof and battery module

Abstract

The invention provides a multi-stack-core structure of a battery, an assembly method of the multi-stack-core structure and a battery module. The battery multi-stacked-core structure comprises a cross-shaped connecting piece and a plurality of stacked-core single bodies (10), each stacked-core single body (10) comprises a stacked-core body (101) and a tab arranged at the end of the stacked-core body (101), each connecting arm of the cross-shaped connecting piece is connected with the tab of at least one stacked-core single body (10), the same cross-shaped connecting piece is connected with the same-polarity tabs of the stacked-core single bodies (10), and the stacked-core single bodies (10) are connected with the same-polarity tabs of the stacked-core single bodies (10). And the plurality of laminated core monomers (10) are spliced to form a multi-laminated core assembly. According to the battery multi-stacked-core structure, parallel assembly of multiple numbers of stacked cores can be achieved, the process adaptability of the blade battery is effectively improved, and the energy density of the blade battery is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a battery multi-core structure and an assembly method thereof, and a battery module. Background Art

[0002] Blade battery is an innovative structural design of lithium-ion battery. It is named because the shape of the battery core is similar to a blade, with a flat and long appearance. The main advantage of this battery design is that it optimizes the battery structure, improves the energy density, and reduces the cost and weight of the battery pack. The stacked core of the blade battery usually adopts a structure with two-end tabs, that is, the tabs of the positive and negative electrodes extend from the two opposite long sides of the stacked core respectively. This design is conducive to the heat dissipation of the battery and the uniform distribution of current.

[0003] In the traditional blade battery design, the battery cells are independent, and each battery cell contains a positive electrode, a negative electrode and an electrolyte. After the tabs extend from both ends of the stacked core, they are usually connected to the positive and negative electrode covers of the battery casing, and then a battery pack is formed by multiple independent battery cells.

[0004] As the name implies, the square battery is designed to be rectangular in shape and is another common structure of lithium-ion batteries. The stacked or rolled core design of the square battery usually has the tabs on the same side, that is, the positive and negative tabs extend from the same side of the battery, which makes the assembly and parallel connection of the battery cells relatively convenient. The structural design of the square battery allows multiple battery cells to be connected in parallel in the battery housing. By welding the tabs of multiple battery cells to a common tab busbar, the battery cells are connected in parallel, thereby achieving higher energy density and greater capacity.

[0005] The parallel connection of square batteries reduces the number of connectors inside the battery pack and improves the integration of the battery pack. In addition, the cell size of square batteries is highly customizable and can meet the needs of various application environments, such as electric vehicles and energy storage systems.

[0006] The core of traditional blade batteries is a structure with tabs at both ends. The shell of blade batteries usually contains only a single core, and finally several blade batteries are combined into a PACK package. This will result in too many structural parts required for the PACK package, limiting the effective improvement of energy density. The core of traditional square lithium batteries is a structure with tabs on the same side, and several cores are often connected in parallel to increase energy density.

[0007] If the energy density of blade batteries is increased by using multiple stacked cores in parallel, traditional solutions often refer to the process of square batteries and adopt a double stacked core parallel mode, but it cannot achieve parallel assembly of any number of stacked cores, which greatly restricts the process adaptability. Summary of the invention

[0008] The main purpose of the present invention is to provide a battery multi-core structure and its assembly method, and a battery module, which can realize parallel assembly of multiple numbers of cores, effectively improve the process adaptability of the blade battery, and enhance the energy density of the blade battery.

[0009] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a multi-stacked core structure of a battery is provided, comprising a cross-shaped connecting piece and a plurality of stacked core monomers, wherein the stacked core monomers comprise a stacked core body and a pole ear arranged at the end of the stacked core body, each connecting arm of the cross-shaped connecting piece is connected to a pole ear of at least one stacked core monomer, and the same cross-shaped connecting piece is connected to the same-sex pole ears of a plurality of stacked core monomers, and a plurality of stacked core monomers are assembled to form a multi-stacked core assembly. The formed multi-stacked core structure of the battery has a stacked core structure that meets the appearance requirements, so that a multi-stacked core blade battery can be obtained, and by changing the number of stacked cores at different core positions, any number of stacked cores can be assembled in parallel, thereby effectively improving the process adaptability of the blade battery and improving the energy density of the blade battery.

[0010] Furthermore, an XY coordinate system is established with the center of the cross-shaped connecting piece as the origin and the extension direction of the connecting arm as the X coordinate and the Y coordinate. The multi-core structure includes X-direction core stacking and -X-direction core stacking stacking along the X direction, and Y-direction core stacking and -Y-direction core stacking stacking along the Y direction. The X-direction core stacking and -X-direction core stacking are arranged at intervals, and the interval between the X-direction core stacking and -X-direction core stacking forms an installation space. The Y-direction core stacking and -Y-direction core stacking are located in the installation space, and the Y-direction core stacking and -Y-direction core stacking are stacked. Using the cross-shaped connecting piece as the reference for establishing the coordinate system not only realizes the parallel connection of the core stacking monomers, but also optimizes the layout of the core stacking monomers, making the multi-core structure of the battery more compact.

[0011] Furthermore, in the XY coordinate system, the number of -X-direction stacked cores is S1, the number of X-direction stacked cores is S2, the number of -Y-direction stacked cores is S3, the number of Y-direction stacked cores is S4, the number of stacked cores in the multi-stacked core structure is S1+S2+S3+S4, the width of a single stacked core monomer is M, the thickness is N, and M=(S3+S4)*N. After the -X-direction stacked cores, the X-direction stacked cores, the -Y-direction stacked cores and the Y-direction stacked cores are combined, a regular rectangular stacked core structure is formed as a whole, which meets the design requirements of the blade battery.

[0012] Furthermore, S1=S2=S3=S4=S, M=2*S*N. This can effectively improve the battery energy density and ensure the regularity of the battery structure and the flexibility of the process.

[0013] Furthermore, the tabs include a positive tab arranged at the first end of the stacked core monomer and a negative tab arranged at the second end of the stacked core monomer, the positive tab is located at the end of the stacked core monomer, the negative tab is located at one side of the thickness direction of the end of the stacked core monomer, the cross-shaped connecting piece includes a positive connecting piece and a negative connecting piece, each connecting arm of the positive connecting piece is connected to the positive tab of the stacked core monomer, and each connecting arm of the negative connecting piece is connected to the negative tab of the stacked core monomer. By connecting multiple groups of stacked core monomers in parallel, the battery capacity can be increased without increasing the battery volume, thereby improving the energy density.

[0014] Further, the negative electrode connecting piece is welded to the negative electrode ear to form a first weld mark, and the first weld mark is covered with an insulating tape; and / or, the positive electrode connecting piece is welded to the positive electrode ear to form a second weld mark, and the second weld mark is covered with an insulating tape. The insulating tape can effectively isolate the weld mark from the surrounding environment, prevent the weld mark from contacting other conductors or the electrode ear, and avoid internal short circuit of the battery. Dust may be generated during the welding process, and covering with insulating tape can prevent the dust from spreading, keep the inside of the battery clean, and improve battery performance and safety.

[0015] Furthermore, a connecting arm of the negative electrode connecting piece extending along the Y direction has a negative electrode bending area, and the negative electrode bending area is bent in a direction away from the stacked core monomer; and / or a connecting arm of the positive electrode connecting piece extending along the Y direction has a positive electrode bending area, and the positive electrode bending area is bent in a direction away from the stacked core monomer. The design of the bending area on the positive electrode connecting piece and the negative electrode connecting piece allows the connecting piece to be more naturally aligned with the boss on the cover plate during the process of welding the core and the cover plate, which facilitates the operation of the automated assembly line, simplifies the assembly process, and improves production efficiency.

[0016] Furthermore, a through hole is provided on the connecting arm where the positive electrode bending area is located, and the positive electrode ear corresponding to the connecting arm is inserted into the through hole. By providing the through hole, the connection between the positive electrode ear and the connecting arm of the positive electrode connecting sheet can be easily realized, reducing the connection difficulty.

[0017] Furthermore, the battery multi-core structure also includes a shell, and the multi-core assembly is installed in the shell. The main function of the shell is to protect the internal multi-core assembly and provide a complete structural frame for the battery.

[0018] Further, both ends of the shell are respectively provided with openings, the negative electrode connection piece of the multi-stack core assembly is provided at the opening of the first end of the shell, the positive electrode connection piece of the multi-stack core assembly is provided at the opening of the second end of the shell, a negative electrode cover is also provided at the opening of the first end of the shell, a negative electrode boss is provided on the side of the negative electrode cover facing the multi-stack core assembly, and the negative electrode bending area is conductively connected to the negative electrode boss, and a positive electrode cover is also provided at the opening of the second end of the shell, a positive electrode boss is provided on the side of the positive electrode cover facing the multi-stack core assembly, and the positive electrode bending area is conductively connected to the positive electrode boss. The negative electrode cover and the positive electrode cover are conductively connected to the corresponding connection piece through the negative electrode boss and the positive electrode boss respectively, so as to ensure that the electrical connection inside the battery is stable and reliable.

[0019] Furthermore, the negative electrode cover plate further includes a negative electrode substrate, a negative electrode column and an explosion-proof valve, the negative electrode boss is arranged on the side of the negative electrode substrate facing the multi-stack core assembly, the explosion-proof valve is arranged on the negative electrode substrate, and the negative electrode column is arranged on the side of the negative electrode substrate away from the multi-stack core assembly, and the positive electrode cover plate further includes a positive electrode substrate and a positive electrode column, the positive electrode boss is arranged on the side of the positive electrode substrate facing the multi-stack core assembly, and the positive electrode column is arranged on the side of the positive electrode cover plate away from the multi-stack core assembly. By arranging the explosion-proof valve, the battery can release the internal pressure in time when the internal pressure increases abnormally, avoiding safety accidents caused by thermal runaway.

[0020] According to another aspect of the present invention, there is provided a method for assembling the above-mentioned battery multi-core structure, comprising:

[0021] Connecting the connecting arm of the negative electrode connecting piece to the negative electrode ear of each stacked core monomer;

[0022] Connecting the connecting arm of the positive electrode connecting sheet to the positive electrode ear of each stacked core monomer;

[0023] Multiple stacked core monomers are assembled to form a multi-stacked core assembly, which can significantly improve the energy density and current carrying capacity of the battery, reduce the number of structural parts required for the PACK package, thereby reducing the overall weight and volume of the battery system and improving the energy density of the battery pack.

[0024] Further, the steps of connecting the connecting arm of the negative electrode connecting sheet to the negative electrode ear of each stacked core monomer; and connecting the connecting arm of the positive electrode connecting sheet to the positive electrode ear of each stacked core monomer include:

[0025] Placing the negative electrode ears of the -X-direction stacked core, the X-direction stacked core, the -Y-direction stacked core, and the Y-direction stacked core on the ear welding area of ​​the corresponding negative electrode connecting sheet and welding them;

[0026] The -Y-direction stacked cores and the Y-direction stacked cores are gathered together and the cores are closed;

[0027] The -X-direction stacked cores and the X-direction stacked cores are gathered and combined on both sides of the -Y-direction stacked cores and the Y-direction stacked cores;

[0028] The tab welding area of ​​the connecting arm of the positive electrode connecting piece is arranged correspondingly with the positive tabs of the -X-direction stacked core, the X-direction stacked core, the -Y-direction stacked core and the Y-direction stacked core, and then welded. This assembly process can ensure the electrical connection stability and compactness of the structure inside the battery.

[0029] Furthermore, after placing the negative electrode ears of the -X-direction stacked core, the X-direction stacked core, the -Y-direction stacked core and the Y-direction stacked core in the ear welding area of ​​the corresponding negative electrode connecting sheet and welding, the step further includes:

[0030] Cover the welding mark between the negative electrode ear and the negative electrode connecting piece with insulating tape;

[0031] After the step of arranging the tab welding area of ​​the connecting arm of the positive electrode connecting piece corresponding to the positive tabs of the -X-direction stacked core, the X-direction stacked core, the -Y-direction stacked core and the Y-direction stacked core, and welding, the step further includes:

[0032] The welding mark between the positive ear and the positive connecting piece is covered with insulating tape. The insulating tape can effectively isolate the welding mark from the surrounding environment, prevent the welding mark from contacting other conductors or the ear, and avoid internal short circuit of the battery. Dust may be generated during the welding process. Covering with insulating tape can prevent the dust from spreading, keep the inside of the battery clean, and improve battery performance and safety.

[0033] Furthermore, the assembly method further comprises:

[0034] Installing the multi-stack core assembly into the housing;

[0035] Placing the negative electrode cover plate at the first end opening of the shell, and welding the negative electrode boss of the negative electrode cover plate to the negative electrode connecting piece;

[0036] Turning the negative electrode cover plate over and covering the first end opening of the shell, and welding the negative electrode cover plate to the first end opening of the shell;

[0037] Placing the positive electrode cover plate at the second end opening of the shell, and welding the positive electrode boss of the positive electrode cover plate to the positive electrode connecting piece;

[0038] The positive electrode cover is turned over and covered on the second end opening of the shell, and welded to the second end opening of the shell. It is convenient to assemble the multi-stack core structure of the battery, and the welding marks are covered with insulating tape, and the negative electrode cover and the positive electrode cover are welded to the shell, which enhances the electrical isolation inside the battery, reduces the risk of short circuit, and improves the safety of the battery.

[0039] Furthermore, the step of connecting the connecting arm of the negative electrode connecting sheet to the negative electrode ear of each stacked core unit includes:

[0040] Welding the negative electrode connecting piece to the negative electrode boss of the negative electrode cover plate;

[0041] Placing the negative electrode ears of the -X-direction stacked core, the X-direction stacked core, the -Y-direction stacked core, and the Y-direction stacked core on the ear welding area of ​​the corresponding negative electrode connecting sheet and welding them;

[0042] Welding the negative electrode boss of the negative electrode cover plate to the side of the negative electrode connecting piece away from the tab connection area;

[0043] The -Y-direction stacked cores and the Y-direction stacked cores are gathered together and the cores are closed;

[0044] The -X-direction stacked cores and the X-direction stacked cores are gathered and combined on both sides of the -Y-direction stacked cores and the Y-direction stacked cores;

[0045] The step of connecting the connecting arm of the positive electrode connecting sheet to the positive electrode ear of each stacked core monomer comprises:

[0046] The tab welding area of ​​the connecting arm of the positive electrode connecting piece is arranged correspondingly with the positive tabs of the -X-direction stacked core, the X-direction stacked core, the -Y-direction stacked core and the Y-direction stacked core, and then welded;

[0047] The assembly method also includes:

[0048] Installing the multi-stack core assembly with welded negative electrode cover plates into the housing;

[0049] Welding the negative electrode cover plate to the first end opening of the shell;

[0050] Welding the positive electrode boss of the positive electrode cover plate to the side of the positive electrode connecting piece away from the tab connection area;

[0051] The positive electrode cover plate is welded to the second end opening of the shell. The negative electrode cover plate does not need to be folded again, and the positive electrode cover plate only needs to be folded 90 degrees, and then the negative electrode substrate and the positive electrode substrate are respectively welded to the two ends of the shell by laser.

[0052] According to another aspect of the present invention, a battery module is provided, comprising the above-mentioned battery multi-core structure. The design of the battery module can further improve the capacity and power output of the battery, and is suitable for application scenarios such as electric vehicles and energy storage systems that require large capacity and high power output, and also helps to improve the heat dissipation performance of the battery and the reliability of the electrical connection.

[0053] By applying the technical solution of the present invention, the multi-stacked core structure of the battery includes a cross-shaped connecting piece and a plurality of stacked core monomers, the stacked core monomers include a stacked core body and a pole ear arranged at the end of the stacked core body, each connecting arm of the cross-shaped connecting piece is connected to the pole ear of at least one stacked core monomer, the same cross-shaped connecting piece is connected to the same-sex pole ears of multiple stacked core monomers, and multiple stacked core monomers are assembled to form a multi-stacked core assembly. The multi-stacked core structure of the battery adopts a cross-shaped connecting piece as the pole ear connection structure of multiple stacked core monomers, each connecting arm can be connected to the pole ear of at least one stacked core monomer, so that the same-sex pole ears of multiple stacked core monomers can be connected through a cross-shaped connecting piece, and the parallel arrangement of multiple stacked core monomers is realized. Multiple stacked core monomers can be assembled to form a core-joined structure, and the core-joined structure can make the formed battery multi-stacked core structure have a stacked core structure that meets the appearance requirements, so that a multi-stacked core blade battery can be obtained. By changing the number of stacked cores at different core-joined positions, any number of stacked cores can be assembled in parallel, so that the process adaptability of the blade battery can be effectively improved, and the energy density of the blade battery is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0055] Figure 1 is a schematic structural diagram of a core stacking monomer according to an embodiment of the present invention;

[0056] Figure 2 It is a schematic diagram of the structure of the tabs of the stacked core monomer after pre-welding in the present invention;

[0057] Figure 3 is a top view of a four-layered core parallel assembly in Embodiment 1 of the present invention;

[0058] Figure 4 It is a three-dimensional view of the parallel assembly of four stacked cores in the first embodiment of the present invention;

[0059] Figure 5 It is a back view of the four-stacked core parallel assembly in the first embodiment of the present invention;

[0060] Figure 6 It is a schematic diagram of the glue application after welding of the four-stack core parallel assembly in the first embodiment of the present invention;

[0061] Figure 7 is a schematic structural diagram of the negative electrode connecting piece in the first embodiment of the present invention;

[0062] Figure 8 is a schematic diagram of two stacked cores after being combined in the first embodiment of the present invention;

[0063] Fig. 9 yes Figure 8 Partial cross-sectional view of AA;

[0064] Fig.10 is a schematic diagram of a four-layer core after being combined in the first embodiment of the present invention;

[0065] Fig.11 Schematic diagram of the negative electrode side after the four-layer core is combined in the first embodiment of the present invention;

[0066] Fig.12 Schematic diagram of the positive electrode side after the four-layer core is closed in the first embodiment of the present invention;

[0067] Fig.13 is a schematic structural diagram of the positive electrode connecting piece in the first embodiment of the present invention;

[0068] Fig.14 is a schematic diagram of the positive electrode tab and the positive electrode connecting piece after welding in the first embodiment of the present invention;

[0069] Fig.15 is a schematic diagram of the negative electrode connecting piece and the negative electrode cover plate after welding in the first embodiment of the present invention;

[0070] Fig.16 is a schematic diagram of the positive electrode connecting piece and the positive electrode cover plate after welding in the first embodiment of the present invention;

[0071] Fig.17 1 is a schematic diagram of the back side of the positive electrode cover plate and the negative electrode cover plate in the first embodiment of the present invention;

[0072] Fig.18 is a three-dimensional schematic diagram of the positive electrode cover plate and the negative electrode cover plate after being folded in the first embodiment of the present invention;

[0073] Fig.19 is a front view of the positive electrode cover plate and the negative electrode cover plate after being folded in the first embodiment of the present invention;

[0074] Fig. 20 is a top view of the parallel assembly of four stacked cores in the second embodiment of the present invention;

[0075] Fig.21 It is a three-dimensional view of the parallel assembly of four stacked cores in the second embodiment of the present invention;

[0076] Fig. 22 It is a back view of the parallel assembly of four stacked cores in the second embodiment of the present invention;

[0077] Fig.23 It is a three-dimensional view of the parallel assembly of eight stacked cores in the third embodiment of the present invention;

[0078] Fig.24 is a schematic diagram of eight stacked cores after being combined in Embodiment 3 of the present invention; and

[0079] Fig.25It is a flow chart of the assembly method of the battery multi-core structure according to the embodiment of the present invention.

[0080] The above drawings include the following reference numerals:

[0081] 10. Stacked core monomer; 101. Stacked core body; 102. Positive ear; 103. Negative ear; 20. Negative connecting piece; 201. First weld mark; 202. Negative bending area; 203. Negative welding area; 30. Positive connecting piece; 301. Second weld mark; 302. Positive bending area; 303. Positive welding area; 304. Through hole; 40. Insulating tape; 50. Binding tape; 60. Shell; 70. Negative cover plate; 701. Negative boss; 702. Negative substrate; 703. Negative column; 704. Explosion-proof valve; 705. Third weld mark; 80. Positive cover plate; 801. Positive boss; 802. Positive substrate; 803. Positive column; 804. Liquid injection hole; 805. Fourth weld mark; M. Width of single stacked core; N. Thickness of single stacked core. DETAILED DESCRIPTION

[0082] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0083] See also Figures 1 to 24 As shown, according to an embodiment of the present invention, a multi-core structure of a battery includes a cross-shaped connecting piece and a plurality of core-stacked monomers 10, the core-stacked monomer 10 includes a core-stacked body 101 and a pole ear arranged at the end of the core-stacked body 101, each connecting arm of the cross-shaped connecting piece is connected to the pole ear of at least one core-stacked monomer 10, and the same cross-shaped connecting piece is connected to the same-sex pole ears of multiple core-stacked monomers 10, and multiple core-stacked monomers 10 are spliced ​​to form a multi-core assembly.

[0084] In the multi-core structure proposed by the present invention, the cross-shaped connecting piece not only serves as the lug connection structure of the multiple core-stacked monomers 10, but its unique design enables each connecting arm to effectively connect the lug of at least one core-stacked monomer 10, which is not limited to the positive electrode or the negative electrode, but is applicable to both. By using a cross-shaped connecting piece to connect the same-sex lugs of multiple core-stacked monomers 10, the present invention realizes the parallel arrangement of multiple core-stacked monomers 10, and this parallel arrangement significantly reduces the number of connectors compared to the traditional single-core assembly, simplifies the internal structure of the battery, reduces the cost, and also reduces the ineffective space inside the battery, improving the overall energy density.

[0085] The stacked core monomers 10 in the present invention are assembled to form a core-joined structure. This structure not only meets the requirements of the appearance design, making the battery as a whole present a neat and compact shape, but also because the number of stacked core monomers 10 in the core-joined structure can be flexibly adjusted, the present invention can realize the parallel assembly of different numbers of stacked core monomers 10. This design breaks through the limitations of traditional processes and greatly enhances the process adaptability and flexibility of blade batteries, allowing battery manufacturers to freely choose the number of parallel stacked cores according to specific application scenarios and energy requirements, thereby achieving customized improvement in energy density.

[0086] Therefore, the multi-stacked core structure of the present invention not only simplifies the internal connection of the battery and improves the energy density, but also realizes the flexible customization of the battery energy density by changing the number of stacked cores at different core positions, greatly improving the process adaptability and product diversity of the blade battery.

[0087] In one embodiment, an XY coordinate system is established with the center of the cross-shaped connecting piece as the origin and the extending direction of the connecting arm as the X coordinate and the Y coordinate. The multi-stacked core structure of the battery includes an X-direction stacked core and a -X-direction stacked core stacked along the X direction, and a Y-direction stacked core and a -Y-direction stacked core stacked along the Y direction. The X-direction stacked core and the -X-direction stacked core are arranged at intervals, and the interval between the X-direction stacked core and the -X-direction stacked core forms an installation space. The Y-direction stacked core and the -Y-direction stacked core are located in the installation space, and the Y-direction stacked core and the -Y-direction stacked core are stacked.

[0088] The use of the cross-shaped connecting piece as the reference for establishing the coordinate system not only realizes the parallel connection of the stacked core monomers 10, but also optimizes the layout of the stacked core monomers 10, making the multi-stacked core structure of the battery more compact. The XY coordinate system established with the center of the cross-shaped connecting piece as the origin and the extension direction of the connecting arm as the X coordinate and the Y coordinate helps to clearly describe the relative position and layout of the stacked core monomers 10.

[0089] This layout makes full use of the space inside the battery, improves the battery's energy density, and can significantly reduce the battery volume, making the device thinner and lighter, while maintaining sufficient battery capacity to meet users' needs for high-performance and thin devices.

[0090] In one embodiment, in the XY coordinate system, the number of stacked cores in the -X direction is S1, the number of stacked cores in the X direction is S2, the number of stacked cores in the -Y direction is S3, the number of stacked cores in the Y direction is S4, the number of stacked cores in the multi-stacked core structure is S1+S2+S3+S4, the width of a single stacked core monomer 10 is M, the thickness is N, and M=(S3+S4)N.

[0091] Through the above definition, when the core stacking is performed, the sum of the thickness of the core stacking monomer 10 in the Y direction can be equal to the width of the core stacking monomer 10 in the X direction, so that after the -X direction core stacking, the X direction core stacking, the -Y direction core stacking and the Y direction core stacking are combined, a regular rectangular core stacking structure is formed as a whole, which meets the design requirements of the blade battery. By accurately calculating the size and number of the core stacking monomer 10, the battery structure can be optimized, and the performance and reliability of the battery can be further improved.

[0092] In one embodiment, S1=S2=S3=S4=S, M=2*S*N.

[0093] Through the above definition, the number of stacked core monomers 10 in four directions is the same, which can facilitate the large-scale production of stacked core monomers 10, reduce the design difficulty, and improve the processing efficiency and assembly efficiency. This multi-stacked core structure can not only effectively improve the energy density of the battery, but also ensure the regularity of the battery structure and the flexibility of the process, while reducing costs, optimizing the thermal management performance of the battery, and overall improving the performance and reliability of the battery.

[0094] The tabs include a positive tab 102 arranged at the first end of the core stacked monomer 10 and a negative tab 103 arranged at the second end of the core stacked monomer 10, the positive tab 102 is located at the end of the core stacked monomer 10, and the negative tab 103 is located on one side of the thickness direction of the end of the core stacked monomer 10, and the cross-shaped connecting piece includes a positive connecting piece 30 and a negative connecting piece 20, each connecting arm of the positive connecting piece 30 is connected to the positive tab 102 of the core stacked monomer 10, and each connecting arm of the negative connecting piece 20 is connected to the negative tab 103 of the core stacked monomer 10.

[0095] In this embodiment, the width of the core stack body 101 is M, and the positive electrode tab 102 and the negative electrode tab 103 are respectively located at both ends of the length direction of the core stack body 101; the thickness of the core stack body 101 is N, and the positive electrode tab 102 and the negative electrode tab 103 are respectively formed by stacking a number of tabs of the same sex.

[0096] By connecting multiple stacked core cells in parallel, the battery capacity can be increased without increasing the battery volume, thereby improving the energy density. Compared with the traditional single stacked core blade battery, this method reduces the number of structural parts, allowing more space to be occupied by battery active materials, thereby improving the energy density. Multiple stacked cores in parallel can provide more stable current output, reduce the current density inside the battery, and extend the battery life.

[0097] The use of a cross-shaped connecting piece for connecting the tabs can simplify the assembly process of the battery. In particular, the positive tab 102 and the negative tab 103 are located at both ends of the stacked core monomer 10, respectively. Through pre-welding and core closing operations, fast and efficient assembly can be achieved, reducing manufacturing costs. The connection arms of the positive connecting piece 30 and the negative connecting piece 20 are connected to the positive tab 102 and the negative tab 103 of the stacked core monomer 10, which can ensure good electrical contact and reduce problems such as overheating and short circuit caused by poor contact.

[0098] The above-mentioned multiple tabs of the same sex are welded together by an ultrasonic welding machine, and the negative tab 103 is gathered to the bottom of the stacked core monomer 10 in the thickness direction, while the positive tab 102 can be gathered to any position in the thickness direction of the stacked core monomer 10. In one embodiment, the positive tab 102 is gathered to the middle of the stacked core monomer 10 in the thickness direction.

[0099] In one embodiment, the negative electrode connecting sheet 20 is welded to the negative electrode ear 103 to form a first weld mark 201 , and the first weld mark 201 is covered with an insulating tape 40 .

[0100] In one embodiment, the positive electrode connecting sheet 30 is welded to the positive electrode tab 102 to form a second weld mark 301 , and the second weld mark 301 is covered with an insulating tape 40 .

[0101] The insulating tape 40 can effectively isolate the weld mark from the surrounding environment, prevent the weld mark from contacting other conductors or tabs, and avoid internal short circuits in the battery. Dust may be generated during the welding process, and covering the insulating tape 40 can prevent the dust from spreading, keep the inside of the battery clean, and improve battery performance and safety. The insulating tape 40 not only provides insulation, but also plays a fixing role, enhancing the connection stability between the tab and the connecting piece, and preventing the tab from falling off or loosening during the subsequent assembly process. During the welding process, the local temperature is high, and the insulating tape 40 can provide a certain thermal protection effect to prevent high temperature from damaging the surrounding battery materials. The insulating tape 40 can also prevent water or moisture from invading the interior of the battery, improving the weather resistance and reliability of the battery. By pre-welding the tab and the connecting piece and packaging them with the insulating tape 40, the subsequent battery assembly process can be simplified and production efficiency can be improved.

[0102] In one embodiment, a connecting arm of the negative electrode connecting sheet 20 extending along the Y direction has a negative electrode bending region 202 , and the negative electrode bending region 202 is bent in a direction away from the core stack unit 10 .

[0103] In one embodiment, a connecting arm of the positive electrode connecting sheet 30 extending along the Y direction has a positive electrode bending area 302 , and the positive electrode bending area 302 is bent in a direction away from the core stack unit 10 .

[0104] The design of the bending area on the positive connecting piece 30 and the negative connecting piece 20 allows the connecting piece to be more naturally aligned with the boss on the cover plate during the process of welding the core and the cover plate, which facilitates the operation of the automated assembly line, simplifies the assembly process, and improves production efficiency. The design of the bending area helps electrical isolation, avoids direct contact between the positive and negative connecting pieces in the thickness direction of the core stack 10, and reduces the risk of short circuit. In addition, since the bending area is bent in a direction away from the core stack 10, it can be further covered with insulating materials such as insulating tape 40 to ensure electrical safety.

[0105] A through hole 304 is provided on the connecting arm where the positive electrode bending area 302 is located, and the positive electrode ear corresponding to the connecting arm is inserted into the through hole 304 .

[0106] By providing the through hole 304 , the connection between the positive electrode tab 102 and the connecting arm of the positive electrode connecting sheet 30 can be easily achieved, thereby reducing the connection difficulty.

[0107] In one embodiment, the battery multi-stack core structure further includes a housing 60 , and the multi-stack core assembly is installed in the housing 60 .

[0108] The main function of the shell 60 is to protect the internal multi-stack core assembly and provide a complete structural frame for the battery. The design of the shell 60 needs to consider matching the size of the multi-stack core assembly to ensure the stability and safety of the stacked core assembly inside the shell. The shell 60 is usually made of metal materials, such as aluminum or steel, to provide the necessary strength and thermal conductivity to help the battery dissipate heat during operation. In addition, the shell 60 also has a sealing performance to prevent the external environment from affecting the inside of the battery, such as preventing moisture, oxygen, etc. from entering, and preventing electrolyte leakage.

[0109] In one embodiment, openings are respectively provided at both ends of the shell 60, the negative electrode connecting piece 20 of the multi-stack core assembly is provided at the opening of the first end of the shell 60, and the positive electrode connecting piece 30 of the multi-stack core assembly is provided at the opening of the second end of the shell 60. A negative electrode cover plate 70 is also provided at the opening of the first end of the shell 60, and a negative electrode boss 701 is provided on the side of the negative electrode cover plate 70 facing the multi-stack core assembly, and the negative electrode bending area 202 is conductively connected to the negative electrode boss 701. A positive electrode cover plate 80 is also provided at the opening of the second end of the shell 60, and a positive electrode boss 801 is provided on the side of the positive electrode cover plate 80 facing the multi-stack core assembly, and the positive electrode bending area 302 is conductively connected to the positive electrode boss 801.

[0110] In this embodiment, the opening design at both ends of the housing 60 allows the installation of the negative electrode connecting sheet 20 and the positive electrode connecting sheet 30, thereby realizing the electrical connection between the multi-stack core assembly and the external circuit. Specifically, the negative electrode cover plate 70 and the positive electrode cover plate 80 are respectively conductively connected to the corresponding connecting sheet through the negative electrode boss 701 and the positive electrode boss 801 thereon, so as to ensure that the electrical connection inside the battery is stable and reliable.

[0111] The negative electrode cover plate 70 and the positive electrode cover plate 80 not only provide electrical connection, but also enhance the overall structural stability of the battery and protect the internal components from the influence of the external environment, such as humidity, dust, etc. The boss design on the cover plate can ensure good contact between the connecting piece and the cover plate during welding, improve welding quality and battery sealing, and further prevent electrolyte leakage and foreign substances from entering.

[0112] In one embodiment, the negative electrode cover plate 70 also includes a negative electrode substrate 702, a negative electrode column 703 and an explosion-proof valve 704, the negative electrode boss 701 is arranged on the side of the negative electrode substrate 702 facing the multi-stack core assembly, the explosion-proof valve 704 is arranged on the negative electrode substrate 702, and the negative electrode column 703 is arranged on the side of the negative electrode substrate 702 away from the multi-stack core assembly, and the positive electrode cover plate 80 also includes a positive electrode substrate 802 and a positive electrode column 803, the positive electrode boss 801 is arranged on the side of the positive electrode substrate 802 facing the multi-stack core assembly, and the positive electrode column 803 is arranged on the side of the positive electrode cover plate 80 away from the multi-stack core assembly.

[0113] By setting up the explosion-proof valve 704, the battery can release the internal pressure in time when the internal pressure rises abnormally, avoiding safety accidents caused by thermal runaway. In addition, the design of separating the positive and negative electrode covers from the multi-stack core assembly can effectively isolate the inside and outside of the battery cell, reduce the impact of external factors on the battery cell, and improve overall safety.

[0114] See also Fig.25 As shown, according to an embodiment of the present invention, the assembly method of the multi-stack core structure of the battery includes: connecting the connecting arm of the negative electrode connecting piece 20 to the negative electrode ear 103 of each stacked core monomer 10; connecting the connecting arm of the positive electrode connecting piece 30 to the positive electrode ear 102 of each stacked core monomer 10; and assembling multiple stacked core monomers 10 to form a multi-stack core assembly.

[0115] Compared with the traditional single-core battery, this multi-core battery assembly method can significantly improve the battery's energy density and current carrying capacity, reduce the number of structural parts required for the PACK package, thereby reducing the overall weight and volume of the battery system and improving the energy density of the battery pack. In addition, by changing the number of cores at different core positions, any number of cores can be assembled in parallel, which enhances the flexibility and process adaptability of the battery production process.

[0116] like Figures 8 to 19As shown, the assembly process of the multi-stacked core structure of the battery of the first embodiment of the present invention, in which the assembly method includes: placing the negative pole ear 103 of the -X-direction stacked core, the X-direction stacked core, the -Y-direction stacked core and the Y-direction stacked core on the pole ear welding area of ​​the corresponding negative electrode connecting piece 20, and welding; folding the -Y-direction stacked core and the Y-direction stacked core and closing the core; folding the -X-direction stacked core and the X-direction stacked core and closing the core on both sides of the -Y-direction stacked core and the Y-direction stacked core; setting the pole ear welding area of ​​the connecting arm of the positive electrode connecting piece 30 corresponding to the positive pole ear 102 of the -X-direction stacked core, the X-direction stacked core, the -Y-direction stacked core and the Y-direction stacked core, and welding. This assembly process can ensure the electrical connection stability and compactness of the structure inside the battery. In the battery design of portable electronic products, this method can reduce the device space occupied by the battery, making the device more compact, easy to carry and use.

[0117] First, the negative electrode ears 103 of the -X-direction stacked core, the X-direction stacked core, the -Y-direction stacked core and the Y-direction stacked core are respectively placed on the negative electrode welding area 203 of the corresponding negative electrode connecting sheet 20, and the negative electrode ears 103 are welded together with the negative electrode connecting sheet 20 using ultrasonic or laser welding technology to form a first weld mark 201.

[0118] Afterwards, the -X-direction stacked core and the X-direction stacked core whose negative electrode ears 103 have been welded to the negative electrode connecting sheet 20 are folded, and then the -X-direction stacked core and the X-direction stacked core are combined on both sides of the -Y-direction stacked core and the Y-direction stacked core to form a complete four-core parallel structure.

[0119] Finally, the positive electrode welding area 303 of the positive electrode connecting sheet 30 is set corresponding to the positive electrode ears 102 of the -X-direction stacked core, the X-direction stacked core, the -Y-direction stacked core, and the Y-direction stacked core, and the positive electrode ears 102 and the positive electrode connecting sheet 30 are welded together using laser welding technology to form a second weld mark 301. Before welding, the positive electrode ears 102 can be bent onto the positive electrode bending area 302 of the positive electrode connecting sheet 30 to ensure the stability of the welding process and the structural strength after welding.

[0120] After the core of the multi-stacked core structure is assembled, the plurality of stacked core units 10 may be fixed together using a binding belt 50. The binding belt 50 may be, for example, a binding tape, or may be other types of binding belt structures.

[0121] In one embodiment, the assembly method further includes: covering the weld mark between the negative electrode ear 103 and the negative electrode connecting sheet 20 with an insulating tape 40 ; and covering the weld mark between the positive electrode ear 102 and the positive electrode connecting sheet 30 with an insulating tape 40 .

[0122] The insulating tape 40 can effectively isolate the weld mark from the surrounding environment, prevent the weld mark from contacting other conductors or tabs, and avoid internal short circuits in the battery. Dust may be generated during the welding process, and covering the insulating tape 40 can prevent the dust from spreading, keep the inside of the battery clean, and improve battery performance and safety. The insulating tape 40 not only provides insulation, but also plays a fixing role, enhancing the connection stability between the tab and the connecting piece, and preventing the tab from falling off or loosening during the subsequent assembly process. During the welding process, the local temperature is high, and the insulating tape 40 can provide a certain thermal protection effect to prevent high temperature from damaging the surrounding battery materials. The insulating tape 40 can also prevent water or moisture from invading the interior of the battery, improving the weather resistance and reliability of the battery. By pre-welding the tab and the connecting piece and packaging them with the insulating tape 40, the subsequent battery assembly process can be simplified and production efficiency can be improved.

[0123] In one embodiment, the assembly method also includes: loading the multi-stack core assembly into the shell 60; placing the negative cover plate 70 at the first end opening of the shell 60, so that the negative boss 701 of the negative cover plate 70 is welded to the negative connecting piece 20; flipping the negative cover plate 70 and covering the first end opening of the shell 60, and welding it to the first end opening of the shell 60; placing the positive cover plate 80 at the second end opening of the shell 60, so that the positive boss 801 of the positive cover plate 80 is welded to the positive connecting piece 30; flipping the positive cover plate 80 and covering the second end opening of the shell 60, and welding it to the second end opening of the shell 60.

[0124] The above-mentioned parallel multi-stack core assembly is placed in the shell 60, and the negative electrode bending area 202 and the positive electrode bending area 302 are respectively laser welded on the negative electrode boss 701 and the positive electrode boss 801 to obtain the third weld mark 705 and the fourth weld mark 805, respectively. Finally, the third weld mark 705 and the fourth weld mark 805 are covered with insulating tape 40.

[0125] The negative electrode cover plate 70 is mainly composed of a negative electrode boss 701, a negative electrode substrate 702, a negative electrode column 703, and an explosion-proof valve 704, and the negative electrode boss 701 is fixedly connected to the negative electrode column 703, and both are isolated from the negative electrode substrate 702 by an insulating component; the positive electrode cover plate 80 is mainly composed of a positive electrode boss 801, a positive electrode substrate 802, a positive electrode column 803, and an injection hole 804, and the positive electrode boss 801 is fixedly connected to the positive electrode column 803, and both are isolated from the positive electrode substrate 802 by an insulating component.

[0126] Through the above method, the assembly of the multi-stack core structure of the battery can be facilitated, and the use of the insulating tape 40 to cover the weld mark and the welding of the negative electrode cover plate 70 and the positive electrode cover plate 80 with the housing 60 enhances the electrical isolation inside the battery, reduces the risk of short circuit, and improves the safety of the battery. At the same time, the provision of the explosion-proof valve 704 and the injection hole 804 also further ensures the safety of the battery under abnormal conditions.

[0127] In the first embodiment, it is a schematic diagram of four stacked cores assembled in parallel, and a single stacked core monomer 10 satisfies the following size relationship: M=2N. First, the negative pole ears 103 of the four stacked core monomers 10 are placed on the welding area of ​​the negative electrode connecting sheet 20, respectively, and the negative electrode bending area 202 is located on the back. The negative pole ears 103 and the negative electrode connecting sheet 20 are welded together by ultrasound or laser to obtain the first weld mark 201. Finally, the first weld mark 201 is covered with an insulating tape 40, which can prevent the diffusion of welding dust on the one hand, and prevent the negative pole ears 103 from being inserted into the stacked core body 101 to cause a short circuit when the core is subsequently assembled.

[0128] See also Figure 20 to Figure 22 Therefore, for the assembly process of the multi-stacked battery structure of the second embodiment of the present invention, in the second embodiment, the assembly method includes: welding the negative electrode connecting piece 20 to the negative electrode boss 701 of the negative electrode cover plate 70; placing the negative electrode ears 103 of the -X-direction stacked core, the X-direction stacked core, the -Y-direction stacked core and the Y-direction stacked core on the corresponding electrode ear welding area of ​​the negative electrode connecting piece 20, and welding; welding the negative electrode boss 701 of the negative electrode cover plate 70 to the side of the negative electrode connecting piece 20 away from the electrode ear connection area; folding the -Y-direction stacked core and the Y-direction stacked core and closing the core; folding the -X-direction stacked core, the X-direction stacked core The cores are gathered and combined on both sides of the -Y-direction stacked core and the Y-direction stacked core; the pole ear welding area of ​​the connecting arm of the positive connecting piece 30 is set corresponding to the positive ear 102 of the -X-direction stacked core, the X-direction stacked core, the -Y-direction stacked core and the Y-direction stacked core, and welded; the assembly method also includes: loading the multi-stacked core assembly with welded negative cover plate 70 into the shell 60; welding the negative cover plate 70 to the first end opening of the shell 60; welding the positive boss 801 of the positive cover plate 80 to the side of the positive connecting piece 30 away from the pole ear connection area; welding the positive cover plate 80 to the second end opening of the shell 60.

[0129] The difference between the second embodiment and the first embodiment is that, in the first embodiment, the multi-stack core assembly is first installed in the housing, and then the multi-stack core assembly is assembled with the negative electrode cover plate 70 and the positive electrode cover plate 80, while in the second embodiment, the multi-stack core assembly is first assembled with the negative electrode cover plate 70, and then the multi-stack core assembly assembled with the negative electrode cover plate 70 is installed in the housing, and then the multi-stack core assembly is assembled with the positive electrode cover plate 80. In the second embodiment, the negative electrode cover plate 70 does not need to be folded again, and only the positive electrode cover plate needs to be folded 90 degrees, and then the negative electrode substrate 702 and the positive electrode substrate 802 are respectively welded to the two ends of the housing 60 by laser.

[0130] Figure 23 to Figure 24 Schematic diagram of eight stacked cores in parallel assembly in the third embodiment of the present invention, where a single stacked core unit 10 satisfies the following dimensional relationship: M = 4N. Fig.23 As shown, two stacked core monomers 10 are first stacked, and the stacked positive and negative tabs are pre-welded to complete the tab folding, and finally assembled according to the method of the above-mentioned embodiment 1 or embodiment 2.

[0131] by Fig.23 Taking an example for explanation, if a coordinate system as shown in the figure is established with the center of the negative electrode connecting sheet 20 as the origin, in the first embodiment, the -X direction, the X direction, the -Y direction, and the Y direction correspond to a single stacked core respectively; and in the second embodiment, the -X direction, the X direction, the -Y direction, and the Y direction correspond to two single stacked cores respectively.

[0132] The present invention can be derived into a variety of assembly methods. If S stacked core monomers 10 are stacked first and the positive and negative tabs are pre-welded to complete the tab folding, that is, the -X direction, X direction, -Y direction, and Y direction correspond to S stacked core monomers 10 respectively, and finally assembled according to the method of the above-mentioned embodiment 1 or embodiment 2, then a single stacked core monomer 10 should satisfy the following size relationship: M=2*S*N.

[0133] According to an embodiment of the present invention, a battery module includes the above-mentioned battery multi-core structure.

[0134] The design of the battery module can further improve the capacity and power output of the battery, and is suitable for application scenarios such as electric vehicles and energy storage systems that require large capacity and high power output. It also helps to improve the heat dissipation performance of the battery and the reliability of the electrical connection, ensuring the stable operation of the battery in complex environments, and providing strong support for technological progress in the fields of electric vehicles and energy storage systems. By optimizing the structural design of the battery module, the battery module can be lightweight and miniaturized, the internal resistance of the battery can be reduced, and the charging and discharging efficiency of the battery can be improved. It also helps to reduce the production cost of the battery and improve the market competitiveness of the battery.

[0135] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0136] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0137] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery multi-core structure, characterized in that: The invention comprises a cross-shaped connecting piece and a plurality of stacked core monomers (10), wherein the stacked core monomers (10) comprise a stacked core body (101) and a pole ear arranged at the end of the stacked core body (101), each connecting arm of the cross-shaped connecting piece is connected to a pole ear of at least one of the stacked core monomers (10), and the same cross-shaped connecting piece is connected to the same pole ears of a plurality of the stacked core monomers (10), and the plurality of the stacked core monomers (10) are assembled to form a multi-stacked core assembly.

2. The battery multi-core structure according to claim 1, characterized in that: An XY coordinate system is established with the center of the cross-shaped connecting piece as the origin and the extending direction of the connecting arm as the X coordinate and the Y coordinate. The multi-stacked core structure includes an X-direction stacked core and a -X-direction stacked core stacked along the X direction, and a Y-direction stacked core and a -Y-direction stacked core stacked along the Y direction. The X-direction stacked core and the -X-direction stacked core are arranged at intervals, and the interval between the X-direction stacked core and the -X-direction stacked core forms an installation space. The Y-direction stacked core and the -Y-direction stacked core are located in the installation space, and the Y-direction stacked core and the -Y-direction stacked core are stacked.

3. The battery multi-core structure according to claim 2, characterized in that: In the XY coordinate system, the number of the stacked cores in the -X direction is S1, the number of the stacked cores in the X direction is S2, the number of the stacked cores in the -Y direction is S3, the number of the stacked cores in the Y direction is S4, the number of the stacked cores in the multi-stacked core structure is S1+S2+S3+S4, the width of a single stacked core monomer (10) is M, the thickness is N, and M=(S3+S4)*N.

4. The battery multi-core structure according to claim 3, characterized in that: S1=S2=S3=S4=S, M=2*S*N.

5. The battery multi-core structure according to claim 2, characterized in that: The electrode tabs include a positive electrode tab (102) arranged at a first end of the core stacking monomer (10) and a negative electrode tab (103) arranged at a second end of the core stacking monomer (10); the positive electrode tab (102) is located at the end of the core stacking monomer (10); the negative electrode tab (103) is located on one side of the end of the core stacking monomer (10) in a thickness direction; the cross-shaped connecting piece includes a positive electrode connecting piece (30) and a negative electrode connecting piece (20); each connecting arm of the positive electrode connecting piece (30) is connected to the positive electrode tab (102) of the core stacking monomer (10); each connecting arm of the negative electrode connecting piece (20) is connected to the negative electrode tab (103) of the core stacking monomer (10).

6. The battery multi-core structure according to claim 5, characterized in that: The negative electrode connecting piece (20) is welded to the negative electrode ear (103) to form a first weld mark (201), and the first weld mark (201) is covered with an insulating tape (40); and / or the positive electrode connecting piece (30) is welded to the positive electrode ear (102) to form a second weld mark (301), and the second weld mark (301) is covered with an insulating tape (40).

7. The battery multi-core structure according to claim 5, characterized in that: One of the connecting arms of the negative electrode connecting sheet (20) extending along the Y direction has a negative electrode bending region (202), and the negative electrode bending region (202) is bent in a direction away from the stacked core monomer (10); and / or one of the connecting arms of the positive electrode connecting sheet (30) extending along the Y direction has a positive electrode bending region (302), and the positive electrode bending region (302) is bent in a direction away from the stacked core monomer (10).

8. The battery multi-core structure according to claim 7, characterized in that: The connecting arm where the positive electrode bending area is located is provided with a through hole, and the positive electrode ear (102) corresponding to the connecting arm is inserted into the through hole.

9. The battery multi-core structure according to claim 7, characterized in that: The battery multi-stack core structure further comprises a housing (60), and the multi-stack core assembly is installed in the housing (60).

10. The battery multi-core structure according to claim 9, characterized in that: The shell (60) is provided with openings at both ends, the negative electrode connecting piece (20) of the multi-stack core assembly is provided at the opening of the first end of the shell (60), and the positive electrode connecting piece (30) of the multi-stack core assembly is provided at the opening of the second end of the shell (60). The opening of the first end of the shell (60) is also provided with a negative electrode cover plate (70), and a negative electrode boss (701) is provided on the side of the negative electrode cover plate (70) facing the multi-stack core assembly, and the negative electrode bending area (202) is conductively connected to the negative electrode boss (701). The opening of the second end of the shell (60) is also provided with a positive electrode cover plate (80), and a positive electrode boss (801) is provided on the side of the positive electrode cover plate (80) facing the multi-stack core assembly, and the positive electrode bending area (302) is conductively connected to the positive electrode boss (801).

11. The battery multi-core structure according to claim 10, characterized in that: The negative electrode cover plate (70) further comprises a negative electrode substrate (702), a negative electrode column (703) and an explosion-proof valve (704); the negative electrode boss (701) is arranged on the side of the negative electrode substrate (702) facing the multi-stack core assembly; the explosion-proof valve (704) is arranged on the negative electrode substrate (702); the negative electrode column (703) is arranged on the side of the negative electrode substrate (702) facing away from the multi-stack core assembly; the positive electrode cover plate (80) further comprises a positive electrode substrate (802) and a positive electrode column (803); the positive electrode boss (801) is arranged on the side of the positive electrode substrate (802) facing the multi-stack core assembly; the positive electrode column (803) is arranged on the side of the positive electrode cover plate (80) facing away from the multi-stack core assembly.

12. A method for assembling a battery multi-core structure according to any one of claims 2 to 11, characterized in that: include: Connecting the connecting arm of the negative electrode connecting sheet (20) to the negative electrode ear (103) of each stacked core monomer (10); Connecting the connecting arm of the positive electrode connecting sheet (30) to the positive electrode ear (102) of each stacked core monomer (10); A plurality of stacked core monomers (10) are assembled to form a multi-stacked core assembly.

13. The method for assembling a battery multi-core structure according to claim 12, characterized in that: The steps of connecting the connecting arm of the negative electrode connecting sheet (20) to the negative electrode ear (103) of each stacked core unit (10); and connecting the connecting arm of the positive electrode connecting sheet (30) to the positive electrode ear (102) of each stacked core unit (10) include: Placing the negative electrode tabs (103) of the -X-direction stacked core, the X-direction stacked core, the -Y-direction stacked core, and the Y-direction stacked core in the tab welding area of ​​the corresponding negative electrode connecting sheet (20), and welding them; The -Y-direction stacked cores and the Y-direction stacked cores are gathered together and the cores are closed; The -X-direction stacked cores and the X-direction stacked cores are gathered and combined on both sides of the -Y-direction stacked cores and the Y-direction stacked cores; The tab welding area of ​​the connecting arm of the positive electrode connecting sheet (30) is arranged corresponding to the positive tabs (102) of the -X-direction stacked core, the X-direction stacked core, the -Y-direction stacked core and the Y-direction stacked core, and then welded.

14. The method for assembling a multi-stack battery core structure according to claim 13, characterized in that: After placing the negative electrode tabs (103) of the -X-direction stacked core, the X-direction stacked core, the -Y-direction stacked core and the Y-direction stacked core on the tab welding area of ​​the corresponding negative electrode connecting sheet (20) and performing welding, the method further comprises: An insulating tape (40) is covered on the weld mark between the negative electrode ear (103) and the negative electrode connecting piece (20); After the step of arranging the electrode tab welding area of ​​the connecting arm of the positive electrode connecting sheet (30) correspondingly to the positive electrode tabs (102) of the -X-direction stacked core, the X-direction stacked core, the -Y-direction stacked core and the Y-direction stacked core, and welding, the step further includes: The welding mark between the positive electrode ear (102) and the positive electrode connecting piece (30) is covered with an insulating tape (40).

15. The method for assembling a battery multi-core structure according to claim 12, characterized in that: The assembly method further comprises: Installing the multi-stack core assembly into a housing (60); Placing the negative electrode cover plate (70) at the first end opening of the housing (60) so that the negative electrode boss (701) of the negative electrode cover plate (70) is welded to the negative electrode connecting piece (20); Turning over the negative electrode cover plate (70) and covering the first end opening of the shell (60), and welding the negative electrode cover plate (70) to the first end opening of the shell (60); Placing the positive electrode cover plate (80) at the second end opening of the housing (60) so that the positive electrode boss (801) of the positive electrode cover plate (80) is welded to the positive electrode connecting piece (30); The positive electrode cover plate (80) is turned over and covered on the second end opening of the shell (60), and is welded to the second end opening of the shell (60).

16. The method for assembling a multi-stack battery core structure according to claim 12, characterized in that: The step of connecting the connecting arm of the negative electrode connecting sheet (20) to the negative electrode ear (103) of each stacked core unit (10) comprises: Welding the negative electrode connecting piece (20) onto the negative electrode boss (701) of the negative electrode cover plate (70); Placing the negative electrode tabs (103) of the -X-direction stacked core, the X-direction stacked core, the -Y-direction stacked core, and the Y-direction stacked core in the tab welding area of ​​the corresponding negative electrode connecting sheet (20), and welding them; Welding the negative electrode boss (701) of the negative electrode cover plate (70) to the side of the negative electrode connecting piece (20) away from the tab connection area; The -Y-direction stacked cores and the Y-direction stacked cores are gathered together and the cores are closed; The -X-direction stacked cores and the X-direction stacked cores are gathered and combined on both sides of the -Y-direction stacked cores and the Y-direction stacked cores; The step of connecting the connecting arm of the positive electrode connecting sheet (30) to the positive electrode ear (102) of each stacked core unit (10) comprises: arranging the ear welding area of ​​the connecting arm of the positive electrode connecting sheet (30) correspondingly to the positive electrode ear (102) of the -X stacked core, the X stacked core, the -Y stacked core and the Y stacked core, and welding them; The assembly method further comprises: Installing a multi-layer core assembly with a welded negative electrode cover plate (70) into a housing (60); Welding the negative electrode cover plate (70) to the first end opening of the shell (60); Welding the positive electrode boss (801) of the positive electrode cover plate (80) to the side of the positive electrode connecting piece (30) away from the tab connection area; The positive electrode cover plate (80) is welded to the second end opening of the shell (60).

17. A battery module, characterized in that: A battery multi-core structure comprising the battery multi-core structure according to any one of claims 1 to 11.

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