Stacked core assembly, lithium battery and assembly method of lithium battery

Abstract

The invention provides a laminated core assembly, a lithium battery and an assembly method of the lithium battery. The stacked core assembly comprises: a stacked assembly, which comprises a plurality of stacked core assembly units stacked in sequence along a Z axis, each stacked core assembly unit comprises a plurality of stacked cores arranged in parallel along an X axis or a Y axis, and each stacked core comprises a stacked core body, a positive tab and a negative tab; the positive electrode connecting component comprises a positive electrode connecting part and a positive electrode leading-out end connected with the positive electrode connecting part, the positive electrode connecting part is provided with a negative electrode avoiding area, the negative electrode avoiding area is used for avoiding at least one negative electrode lug, and the multiple positive electrode lugs are all connected with the positive electrode connecting part; the negative electrode connecting component comprises a negative electrode connecting part and a negative electrode leading-out end connected with the negative electrode connecting part, the negative electrode connecting part is provided with a positive electrode avoiding area, the positive electrode avoiding area is used for avoiding at least one positive electrode lug, and the multiple negative electrode lugs are all connected with the negative electrode connecting part. According to the technical scheme of the invention, the problem of low energy density of the PACK packet in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a stacked core assembly, a lithium battery, and an assembling method of a lithium battery. Background Art

[0002] A laminated battery is a lithium battery manufactured using a lamination process, in which positive electrode sheets, negative electrode sheets and separators are stacked to form a multi-layer structured battery cell.

[0003] In the prior art, the method for assembling a laminated battery is to place a single laminated core in a single housing to form a single cell, and then connect several single cells in parallel to form a PACK (battery pack).

[0004] Since there are gaps between the single cells and more complex connectors are required for parallel connection of the cells, the number of single cells placed in the PACK package is small, resulting in a low energy density of the PACK package. Summary of the Invention

[0005] The main purpose of the present invention is to provide a stacked core assembly, a lithium battery and a method for assembling a lithium battery, so as to solve the problem of low energy density of the PACK package in the prior art.

[0006] In order to achieve the above-mentioned object, the present invention provides a stacked core assembly, comprising: a stacking assembly, comprising a plurality of stacked core assembly units stacked in sequence along the Z axis, the stacked core assembly unit comprising a plurality of stacked cores arranged in parallel along the X axis or the Y axis, the stacked core comprising a stacked core body, a positive electrode tab and a negative electrode tab; a positive electrode connecting member, comprising a positive electrode connecting portion and a positive electrode lead-out terminal connected to the positive electrode connecting portion, a negative electrode avoidance area being provided on the positive electrode connecting portion, the negative electrode avoidance area being used to avoid at least one negative electrode tab, and multiple positive electrode tabs being connected to the positive electrode connecting portion; a negative electrode connecting member, comprising a negative electrode connecting portion and a negative electrode lead-out terminal connected to the negative electrode connecting portion, a positive electrode avoidance area being provided on the negative electrode connecting portion, the positive electrode avoidance area being used to avoid at least one positive electrode tab, and multiple negative electrode tabs being connected to the negative electrode connecting portion.

[0007] In the above technical solution, a stack assembly is formed by arranging multiple stacked core assembly units stacked along the Z axis, and each stacked core assembly unit includes multiple stacked cores arranged in parallel along the X axis or the Y axis. The stack assembly is then placed in a shell to form a lithium battery. Compared to the prior art method of placing a single stacked core in a single shell to form a single battery cell, and then connecting multiple single batteries in parallel to form a PACK package, in this embodiment, on the one hand, multiple stacked cores are arranged in parallel and then placed in a shell, which can avoid the situation where one stacked core is configured in one shell, thereby avoiding the situation where gaps exist between single batteries. On the other hand, by stacking the stacked cores along the X axis, Y axis, and Z axis, and by providing a positive electrode connecting member with a negative electrode avoidance area and a negative electrode connecting member with a positive electrode avoidance area, it is convenient to connect the positive electrode tabs of the multiple stacked cores to the positive electrode connecting member, and to connect the negative electrode tabs of the multiple stacked cores to the negative electrode connecting member, so as to achieve parallel connection of multiple stacked cores. In this way, there is no need to use a large number of complex connectors, which significantly improves the space utilization of the battery PACK package per unit volume, thereby improving the energy density of the PACK package.

[0008] Furthermore, the positive electrode connecting member and the negative electrode connecting member are electrically isolated, the positive electrode connecting portion is attached to the outer peripheral side of the stacking assembly, and the positive electrode lead end protrudes from the stacking assembly, and the negative electrode connecting portion is attached to the outer peripheral side of the stacking assembly, and the negative electrode lead end protrudes from the stacking assembly.

[0009] Through the above arrangement, on the one hand, the positive electrode connection part and the negative electrode connection part are respectively attached to the outer peripheral side of the stacking assembly, and multiple positive electrode ears are connected to the positive electrode connection part, and multiple negative electrode ears are connected to the negative electrode connection part, which can optimize the current flow path; on the other hand, the protrusion of the positive electrode lead-in terminal and the negative electrode lead-in terminal can make it easier to connect to the external circuit, without the need for complex wiring in the limited shell space, simplifying the battery assembly process and improving production efficiency; on the other hand, the stable fit and protruding design of the connecting component help to enhance the structural stability of the stacking assembly, reduce the displacement of the internal battery cells due to vibration or external impact, and thus ensure the reliability of the battery for long-term use.

[0010] Furthermore, the multiple cores of one of the two adjacent core stacking assembly units are arranged in parallel along the X-axis, and the multiple cores of the other of the two adjacent core stacking assembly units are arranged in parallel along the Y-axis, wherein the length of the core stacking body is M, the width of the core stacking body is N, M=X*N, and the number of core stacking cores of each core stacking assembly unit is X.

[0011] In the above technical solution, since M=X*N, a stacked core assembly unit is formed by arranging X stacked cores along the X-axis direction or the Y-axis direction, and multiple stacked core assembly units are stacked along the Z-axis direction to form a stacked assembly. The stacked assembly can form a regular rectangular structure. This regular geometric shape helps to maximize the utilization of the internal space of the battery PACK package, avoids the phenomenon of space waste due to irregular arrangement, and thus significantly improves the energy density of the PACK package.

[0012] Furthermore, along the X-axis, the stacking assembly has a first side and a second side arranged opposite to each other, the positive electrode connection portion includes a first connector, the first connector is attached to the first side, and the positive electrode ears of the multiple stacked cores arranged along the Y-axis are located on the first side and connected to the first connector; the negative electrode connection portion includes a second connector, the second connector is attached to the second side, and the negative electrode ears of the multiple stacked cores arranged along the Y-axis are located on the second side and connected to the second connector.

[0013] In the above technical solution, on the one hand, the use of the first connector and the second connector simplifies the electrical connection between multiple stacked cores. This connection method enables the positive electrode ear located on the first side to be connected to the first connector at one time, and the negative electrode ear and the negative electrode ear located on the second side to be connected to the second connector at one time, thereby reducing operation time and the possibility of operation errors; on the other hand, the positive electrode ear is located on the first side of the stacking assembly, the negative electrode ear is located on the second side of the stacking assembly, and the first connector is attached to the first side and the second connector is attached to the second side, which can achieve electrical isolation and avoid direct contact between the positive electrode ear and the negative electrode ear, significantly reducing the risk of short circuit and enhancing the safety of the stacked core assembly.

[0014] Furthermore, along the Y-axis, the stacking assembly has a third side and a fourth side that are relatively arranged, and the negative electrode ear and the positive electrode ear of one of the multiple stacked cores arranged along the X-axis are respectively arranged on the third side and the fourth side, and the positive electrode ears and the negative electrode ears of the remaining stacked cores in the multiple stacked cores arranged along the X-axis are respectively arranged on the third side and the fourth side; the positive electrode connection portion also includes a third connector and a fourth connector, the third connector is located on the third side, one end of the third connector is connected to the positive electrode lead-out terminal, the other end of the third connector is connected to one end of the first connector, the third connector is connected to the positive electrode ear located on the third side, the fourth connector is located on the fourth side, and the fourth connector is connected to the first connector. The other end of the member is connected, the fourth connector has a positive electrode connection end, the positive electrode connection end is connected to the positive ear located on the fourth side, and the fourth connector is provided with a negative electrode avoidance area; the negative electrode connection part also includes a fifth connector and a sixth connector, the fifth connector is located on the third side, one end of the fifth connector is connected to the negative electrode lead-out terminal, the other end of the fifth connector is connected to one end of the second connector, the fifth connector is connected to the negative electrode ear located on the third side, the sixth connector is located on the fourth side, the sixth connector is connected to the other end of the second connector, the sixth connector has a negative electrode connection end, the negative electrode connection end is connected to the negative electrode ear located on the fourth side, and the sixth connector is provided with a positive electrode avoidance area.

[0015] In the above technical solution, on the one hand, with the introduction of the third connecting piece, the positive ear on the third side can be connected to the third connecting piece, and with the introduction of the fifth connecting piece, the negative ear on the third side can be connected to the fifth connecting piece. In this way, not only the complexity of the electrical connection operation is simplified, but also the reliability of the electrical connection is improved; on the other hand, the design of the positive electrode connection end ensures a stable connection between the positive ear on the fourth side and the fourth connecting piece, and the design of the negative electrode connection end ensures a stable connection between the negative ear on the fourth side and the sixth connecting piece, thereby improving the reliability of the electrical contact and reducing failures and safety hazards caused by poor contact.

[0016] Furthermore, there are two stacked core combination units, each stacked core combination unit includes two stacked cores, one positive electrode connection terminal, and one negative electrode connection terminal; or, there are A stacked core combination units, each stacked core combination unit includes two stacked cores, and the number of positive electrode connection terminals is The negative terminal is The positive electrode connection terminals are spaced apart along the Z axis. The negative electrode connection terminals are spaced apart along the Z axis, where A is a positive integer greater than 2; or, there are two stacked core combination units, each stacked core combination unit includes B stacked cores, one positive electrode connection terminal, and B-1 negative electrode connection terminals, and the B-1 negative electrode connection terminals are spaced apart along the X axis, where B is a positive integer greater than 2.

[0017] In the above technical solution, when there are A (more than two) stacked core combination units and each stacked core combination unit includes two stacked cores, The positive electrode connection terminal can be connected to the positive electrode ear on the fourth side. The negative electrode connection end can be connected to the negative electrode ear located on the fourth side; when there are two stacked core combination units, and each stacked core combination unit includes B stacked cores, the positive electrode connection end can be connected to the positive electrode ear located on the fourth side, and B negative electrode connection ends can be connected to the negative electrode ear located on the fourth side.

[0018] Furthermore, the stacked core assembly also includes a plurality of bundling components, at least one of the plurality of bundling components is arranged around the periphery of the stacking assembly along the circumference of the Y axis, and the remaining bundling components are arranged around the periphery of the stacking assembly along the circumference of the X axis.

[0019] In the above technical solution, the binding member can be arranged around the outer circumference of the stacking assembly along the X-axis and Y-axis directions, so as to bundle the stacking assembly and prevent the displacement of each stacked core, thereby avoiding deformation of the stacked core assembly.

[0020] According to another aspect of the present invention, a lithium battery is provided. The lithium battery comprises: a housing; the aforementioned stacked core assembly, located within the housing; and a cover plate assembly connected to the housing, the cover plate assembly having a positive electrode post and a negative electrode post, the positive lead of the stacked core assembly connected to the positive electrode post of the cover plate assembly, and the negative lead of the stacked core assembly connected to the negative electrode post of the cover plate assembly.

[0021] In the above technical solution, on the one hand, by placing the core stack assembly in the outer shell, multiple core stacks can be arranged in parallel and densely stacked. Compared with the prior art in which a single core stack is placed in the outer shell to form a single battery and multiple single batteries are connected by connectors, this embodiment can significantly improve the energy density of the battery, that is, the amount of electrical energy stored per unit volume; on the other hand, the connection between the positive lead-out terminal and the positive electrode column, and the connection between the negative lead-out terminal and the negative electrode column, simplifies the internal electrical connection structure of the lithium battery and improves the reliability and stability of the electrical connection.

[0022] Furthermore, the outer shell is a cylindrical structure with an internal through hole, and the lithium battery also includes a partition assembly, which is arranged in the internal through hole. The partition assembly divides the internal through hole into two accommodating chambers. The partition assembly includes an insulating plate, and the insulating plate is provided with a plurality of through holes. The plurality of through holes are used to connect two adjacent accommodating chambers. A stacked core assembly is provided in each accommodating chamber. There are two cover plate assemblies, and the two cover plate assemblies are respectively connected to the two ends of the outer shell.

[0023] In the above technical solution, on the one hand, the introduction of the partition assembly divides the internal space of the outer shell into two independent accommodating chambers, and the stacked core assembly in each chamber can operate independently to improve the energy density of the lithium battery; on the other hand, the two independent cover assemblies are respectively connected to the two ends of the outer shell, which simplifies the assembly process of the lithium battery; on the other hand, the design of multiple through holes allows the electrolyte to flow freely between the two accommodating chambers, ensuring the uniform distribution of the electrolyte inside the lithium battery, thereby improving the charging and discharging efficiency and overall performance of the lithium battery.

[0024] Furthermore, the partition assembly further includes a buffer member, which is arranged on the outer periphery of the insulating plate and matches the inner wall surface of the shell.

[0025] Through the above arrangement, the buffer member can be closely attached to the inner wall of the shell, thereby preventing the partition assembly from tilting due to shaking.

[0026] According to another aspect of the present invention, a method for assembling a lithium battery is provided. The lithium battery described above is formed using the method, comprising: splicing a plurality of stacked cores to form a stack assembly; attaching a positive electrode connecting member and a negative electrode connecting member to the outer periphery of the stack assembly; connecting a plurality of positive electrode tabs to the positive electrode connecting member, and connecting a negative electrode tab to the negative electrode connecting member, to form a stacked core assembly.

[0027] In the above technical solution, multiple stacked cores are spliced ​​along the X-axis direction or the Y-axis direction to form a stacked core combination unit, and multiple stacked core combination units are stacked along the Z-axis direction to form a stacked assembly. The positive electrode connecting member and the negative electrode connecting member are respectively attached to the outer periphery of the stacked assembly, and multiple positive electrode ears are connected to the positive electrode connecting member, and multiple negative electrode ears are connected to the negative electrode connecting member. In this way, a stacked core assembly can be formed. In this way, compared with the prior art of placing a single stacked core into a single shell to form a single battery, and then connecting multiple single batteries in parallel to obtain a PACK package, in this embodiment, the situation where one stacked core is configured with one shell can be avoided, which significantly improves the space utilization of the PACK package, thereby improving the energy density in the PACK package.

[0028] Furthermore, the assembly method of the lithium battery also includes: wrapping the insulating film around the Y axis on the circumference of the stacked core assembly and exposing the positive lead-in terminal and the negative lead-in terminal; welding the positive lead-in terminal of the stacked core assembly to the positive electrode column of the cover plate assembly; welding the negative lead-in terminal of the stacked core assembly to the negative electrode column of the cover plate assembly; bending the positive lead-in terminal and the negative electrode lead-in terminal, and covering the cover plate assembly on the stacked core assembly; placing the stacked core assembly in the outer shell, and welding the cover plate assembly to the outer shell to form a lithium battery.

[0029] In the above technical solution, after the core stacking assembly is formed, an insulating film is used to cover the circumference of the core stacking assembly to ensure that the positive lead-in terminal and the negative lead-in terminal are exposed, so as to facilitate the connection between the core stacking assembly and the cover plate assembly, the positive lead-in terminal of the core stacking assembly is welded to the positive pole of the cover plate assembly, and the negative lead-in terminal of the core stacking assembly is welded to the negative pole of the cover plate assembly, and the positive lead-in terminal and the negative lead-in terminal are bent so that they form a certain angle with the core stacking assembly, and the cover plate assembly is placed on the core stacking assembly to ensure that the cover plate assembly is tightly fitted to the core stacking assembly, the core stacking assembly is placed in the outer shell, and then the cover plate assembly is welded to the shell opening of the outer shell to form a lithium battery.

[0030] Furthermore, the assembly method of the lithium battery also includes: placing the stacked core assembly in the outer shell; welding the positive lead-out terminal of the stacked core assembly to the positive electrode column of the cover plate assembly; welding the negative lead-out terminal of the stacked core assembly to the negative electrode column of the cover plate assembly; bending the positive lead-out terminal and the negative lead-out terminal; covering the cover plate assembly on the outer shell, and welding the cover plate assembly and the outer shell to form a lithium battery.

[0031] In the above technical solution, the stacked core assembly is placed in the outer shell, the positive lead-out terminal of the stacked core assembly is welded to the positive electrode column on the cover plate assembly, and the negative lead-out terminal is laser welded to the negative electrode column on the cover plate assembly. After welding is completed, the positive lead-out terminal and the negative lead-out terminal are bent to form a certain angle with the stacked core assembly, and the cover plate assembly is placed on the stacked core assembly. Then, the cover plate assembly is welded to the shell opening of the outer shell to form a lithium battery, wherein the substrate of the cover plate assembly is welded to the shell opening of the outer shell to form a lithium battery.

[0032] By applying the technical solution of the present invention, on the one hand, the use of the first connector and the second connector simplifies the electrical connection between multiple stacked cores. This connection method enables the positive electrode ear located on the first side to be connected to the first connector at one time, and the negative electrode ear and the negative electrode ear located on the second side to be connected to the second connector at one time, thereby reducing operation time and the possibility of operation errors; on the other hand, the positive electrode ear is located on the first side of the stacking assembly, the negative electrode ear is located on the second side of the stacking assembly, and the first connector is attached to the first side and the second connector is attached to the second side, which can achieve electrical isolation, avoid direct contact between the positive electrode ear and the negative electrode ear, significantly reduce the risk of short circuit, and enhance the safety of the stacked core assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 A schematic structural diagram of an embodiment of a stacked core assembly of the present invention is shown;

[0035] Figure 2 A schematic structural diagram of a stacking assembly of a first embodiment of the stacked core assembly of the present invention is shown;

[0036] Figure 3 Shown Figure 2 A top view of a first embodiment of a stacking assembly;

[0037] Figure 4 Shown Figure 2 Schematic diagram of the structure of the stacking assembly of embodiment 1 from two other perspectives;

[0038] Figure 5 Shown Figure 2 A schematic structural diagram of the stacking assembly of embodiment 1 from two perspectives;

[0039] FIG6( a ) shows a schematic structural diagram of a positive electrode connecting member and a negative electrode connecting member of a first embodiment of a stacked core assembly of the present invention from one perspective;

[0040] FIG6( b ) shows a schematic structural diagram of the positive electrode connecting member and the negative electrode connecting member of FIG6( a ) from another perspective;

[0041] Figure 7 It shows a schematic structural diagram of two viewing angles of the embodiment 1 of the stacked core assembly of the present invention;

[0042] Figure 8 A schematic diagram of the assembly structure of a lithium battery of the present invention is shown (wherein the housing and separator assembly are not shown);

[0043] Figure 9 Shown Figure 8 A schematic structural diagram of a lithium battery (wherein the cover plate assembly is provided on the stacked core assembly);

[0044] Figure 10 Shown Figure 9 A cross-sectional view of a lithium battery at AA;

[0045] Figure 11 A schematic structural diagram of a separator assembly of a lithium battery of the present invention is shown;

[0046] Figure 12 Shown Figure 11 A cross-sectional view of the BB portion of a lithium battery;

[0047] Figure 13 A schematic structural diagram of a housing and a separator assembly of a lithium battery of the present invention is shown;

[0048] Figure 14 shows a schematic structural diagram of the lithium battery of the present invention;

[0049] Figure 15 A schematic structural diagram of a second embodiment of the stacked core assembly of the present invention is shown;

[0050] Figure 16(a) shows Figure 15 A schematic structural diagram of a positive electrode connecting member and a negative electrode connecting member of a second embodiment of a stacked core assembly;

[0051] FIG16( b ) shows a schematic structural diagram of the positive electrode connecting member and the negative electrode connecting member of FIG16( a ) from another perspective;

[0052] Figure 17 A schematic structural diagram of a third embodiment of the stacked core assembly of the present invention is shown;

[0053] Figure 18(a) shows Figure 17 A schematic structural diagram of the positive electrode connecting member and the negative electrode connecting member of Example 3 of the stacked core assembly;

[0054] FIG18( b ) shows a schematic structural diagram of the positive electrode connecting member and the negative electrode connecting member of FIG18( a ) from another perspective;

[0055] Figure 19 Another schematic diagram of the assembly structure of the lithium battery of the present invention is shown;

[0056] Figure 20 Shown Figure 19 Schematic diagram of the assembly structure of a lithium battery from one perspective (wherein the cover plate assembly is shown).

[0057] The above drawings include the following reference numerals:

[0058] 1. First side; 2. Second side; 3. Third side; 4. Fourth side; 100. Stacked core assembly unit; 10. Stacked core; 101. Stacked core body; 102. Positive tab; 103. Negative tab; 20. Binding member; 30. Positive electrode connecting member; 301. Positive electrode lead-out terminal; 302. Positive electrode connecting portion; 3021. First connecting member; 303. Negative electrode avoidance area; 3022. Fourth connecting member; 3023. Positive electrode connecting terminal; 3024. Third connecting member; 40. Negative electrode connecting member; 401 , negative electrode lead-out terminal; 402, negative electrode connecting part; 4021, second connecting part; 4022, sixth connecting part; 4023, negative electrode connecting terminal; 4024, fifth connecting part; 403, positive electrode avoidance area; 50, insulating film; 60, cover plate assembly; 601, insulating bottom plate; 602, substrate; 603, injection hole; 604, explosion-proof valve; 605, positive electrode column; 606, negative electrode column; 70, partition assembly; 701, buffer; 702, insulating plate; 703, through hole; 80, outer shell. DETAILED DESCRIPTION

[0059] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this 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.

[0060] It should be noted that, in the embodiment of the present invention, the X-axis direction, the Y-axis direction and the Z-axis direction are as follows: Figure 2 As shown, the X-axis direction, the Y-axis direction and the Z-axis direction are arranged at an angle to each other. Preferably, the Z-axis direction is a vertical direction, and the X-axis direction, the Y-axis direction and the Z-axis direction are arranged perpendicular to each other.

[0061] like Figures 1 to 8 、 Figure 10 、 Figures 14 to 19 As shown, an embodiment of the present invention provides a stacked core assembly. The stacked core assembly includes a stacking assembly, including a plurality of stacked core assembly units 100 stacked in sequence along the Z axis. The stacked core assembly unit 100 includes a plurality of stacked cores 10 arranged in parallel along the X axis or the Y axis. The stacked core 10 includes a stacked core body 101, a positive electrode tab 102, and a negative electrode tab 103. The Z axis, the X axis, and the Y axis are arranged at an angle to each other. The positive electrode connecting member 30 includes a positive electrode connecting portion 302 and a positive electrode lead-out terminal 301 connected to the positive electrode connecting portion 302. The positive electrode connecting portion 302 is provided with A negative electrode avoidance area 303 is provided, and the negative electrode avoidance area 303 is used to avoid at least one negative electrode ear 103, and multiple positive electrode ears 102 are all connected to the positive electrode connecting part 302; a negative electrode connecting member 40 includes a negative electrode connecting part 402 and a negative electrode lead-out terminal 401 connected to the negative electrode connecting part 402, and a positive electrode avoidance area 403 is provided on the negative electrode connecting part 402, and the positive electrode avoidance area 403 is used to avoid at least one positive electrode ear 102, and multiple negative electrode ears 103 are all connected to the negative electrode connecting part 402.

[0062] In the above technical solution, a plurality of stacked core assembly units 100 stacked along the Z axis are provided to form a stack assembly, and each stacked core assembly unit 100 includes a plurality of stacked cores 10 arranged in parallel along the X axis or the Y axis, and the stack assembly is placed in a shell to form a lithium battery. Compared with the prior art in which a single stacked core 10 is placed in a single shell to form a single battery, and then a plurality of single batteries are connected in parallel to obtain a PACK package, in this embodiment, on the one hand, a plurality of stacked cores 10 are arranged in parallel and then placed in a shell, which can avoid the situation in which one stacked core 10 is configured with one shell, thereby avoiding the problem of there being a gap between the single batteries. In the case of gaps; on the other hand, by stacking the cores 10 on the X-axis, Y-axis and Z-axis, and by providing a positive electrode connecting member 30 with a negative electrode avoidance area 303 and a negative electrode connecting member 40 with a positive electrode avoidance area 403, it is convenient to connect the positive electrode ears of multiple cores 10 to the positive electrode connecting member 30, and to connect the negative electrode ears of multiple cores 10 to the negative electrode connecting member 40, so as to realize parallel connection of multiple cores 10. In this way, there is no need to use more complex connectors, which significantly improves the space utilization of the battery PACK package per unit volume, thereby improving the energy density in the PACK package.

[0063] Specifically, in an embodiment of the present invention, the positive electrode tab 102 comprises several layers of aluminum foil having a specific shape, which are pre-welded together using an ultrasonic welder to form the positive electrode tab 102. This serves to secure the positive electrode tab 102 and facilitate subsequent assembly. The negative electrode tab 103 comprises several layers of copper foil having a specific shape, which are pre-welded together using an ultrasonic welder to form the negative electrode tab 103. This serves to secure the negative electrode tab 103 and facilitate subsequent assembly. Specifically, in an embodiment of the present invention, the positive electrode connector 302 is connected to the multiple positive electrode tabs 102, and the negative electrode connector 402 is connected to the multiple negative electrode tabs 103, simplifying the complexity of the electrical connection.

[0064] Specifically, in an embodiment of the present invention, the negative electrode avoidance region 303 can prevent the positive electrode connection portion 302 from contacting a portion of the negative electrode tab 103, thereby preventing an electrical short circuit between the positive electrode tab 102 and the negative electrode tab 103; the positive electrode avoidance region 403 can prevent the negative electrode connection portion 402 from contacting a portion of the positive electrode tab 102, thereby preventing an electrical short circuit between the positive electrode tab 102 and the negative electrode tab 103.

[0065] like Figure 5 As shown in Figure 6(a), in an embodiment of the present invention, the positive electrode connecting member 30 and the negative electrode connecting member 40 are electrically isolated and arranged, the positive electrode connecting portion 302 is attached to the outer peripheral side of the stacking assembly, and the positive electrode lead-out terminal 301 protrudes from the stacking assembly, and the negative electrode connecting portion 402 is attached to the outer peripheral side of the stacking assembly, and the negative electrode lead-out terminal 401 protrudes from the stacking assembly.

[0066] Through the above arrangement, on the one hand, the positive electrode connection part 302 and the negative electrode connection part 402 are respectively attached to the outer peripheral side of the stacking assembly, and multiple positive electrode ears 102 are connected to the positive electrode connection part 302, and multiple negative electrode ears 103 are connected to the negative electrode connection part 402, which can optimize the current flow path; on the other hand, the protrusion of the positive electrode lead-in terminal 301 and the negative electrode lead-in terminal 401 can make it easier to connect to the external circuit, without the need for complex wiring in the limited shell space, simplifying the battery assembly process and improving production efficiency; on the other hand, the stable fit and protruding design of the connecting component help to enhance the structural stability of the stacking assembly, reduce the displacement of the internal battery cells due to vibration or external impact, and thus ensure the reliability of the battery for long-term use.

[0067] Specifically, in the embodiments of the present invention, electrical isolation refers to severing the connection between circuits by physical isolation or insulation measures to prevent current from being conducted between the circuits. In the present invention, the positive electrode connecting member 30 and the negative electrode connecting member 40 are physically isolated, that is, there is a gap between the positive electrode connecting member 30 and the negative electrode connecting member 40, that is, the positive electrode connecting member 30 and the negative electrode connecting member 40 are not in direct contact.

[0068] Preferably, in the embodiment of the present invention, the positive electrode connecting member 30 is made of aluminum, and the negative electrode connecting member 40 is made of copper.

[0069] Preferably, in the embodiment of the present invention, the stacked core 10 is a rectangular parallelepiped. For a single stacked core 10 , along the length direction of the stacked core 10 , the positive electrode tab 102 and the negative electrode tab 103 are respectively located on both sides of the stacked core body 101 .

[0070] like Figure 1 and Figure 10 As shown, in an embodiment of the present invention, the multiple stacked cores 10 of one of the two adjacent stacked core assembly units 100 are arranged in parallel along the X-axis, and the multiple stacked cores 10 of the other of the two adjacent stacked core assembly units 100 are arranged in parallel along the Y-axis, wherein the length of the stacked core body 101 along the length direction is M, and the width of the stacked core body 101 along the width direction is N, M=X*N, wherein the number of stacked cores 10 of each stacked core assembly unit 100 is X.

[0071] In the above technical solution, since M=X*N, a stacked core assembly unit 100 is formed by arranging X stacked cores 10 along the X-axis direction or the Y-axis direction, and multiple stacked core assembly units 100 are stacked along the Z-axis direction to form a stacked assembly, so that the stacked assembly can form a regular rectangular structure. This regular geometric shape helps to maximize the utilization of the internal space of the battery PACK package, avoids the phenomenon of space waste due to irregular arrangement, and thus significantly improves the energy density of the PACK package.

[0072] Specifically, in the embodiment of the present invention, X is a positive integer ≥2.

[0073] like Figures 1 to 3 , Figure 6(a), Figure 6(b), Figure 7 、 Figure 10 and Figure 17 As shown, in an embodiment of the present invention, along the X-axis, the stacking assembly has a first side 1 and a second side 2 arranged opposite to each other, the positive electrode connection portion 302 includes a first connector 3021, and the negative electrode connection portion 402 includes a second connector 4021. The first connector 3021 is attached to the first side 1, and the second connector 4021 is attached to the second side 2. The positive tabs 102 of the multiple stacked cores 10 arranged along the Y-axis are located on the first side 1 and connected to the first connector 3021, and the negative tabs 103 of the multiple stacked cores 10 arranged along the Y-axis are located on the second side 2 and connected to the second connector 4021.

[0074] In the above technical solution, on the one hand, the use of the first connector 3021 and the second connector 4021 simplifies the electrical connection between multiple stacked cores 10. This connection method enables the positive electrode ear 102 located on the first side 1 to be connected to the first connector 3021 at one time, and the negative electrode ear 103 and the negative electrode ear located on the second side 2 to be connected to the second connector 4021 at one time, thereby reducing operation time and the possibility of operation errors; on the other hand, the positive electrode ear 102 is located on the first side 1 of the stacking assembly, the negative electrode ear 103 is located on the second side 2 of the stacking assembly, and the first connector 3021 is attached to the first side 1, and the second connector 4021 is attached to the second side 2, which can achieve electrical isolation and avoid direct contact between the positive electrode ear 102 and the negative electrode ear 103, significantly reducing the risk of short circuit and enhancing the safety of the stacked core assembly.

[0075] like Figures 1 to 3 , Figure 6(a), Figure 6(b), Figure 7 、 Figure 8 、 Figure 10 、 Figures 15 to 19As shown, in the embodiment of the present invention, along the Y-axis, the stacking assembly has a third side 3 and a fourth side 4 arranged opposite to each other, the negative electrode tab 103 and the positive electrode tab 102 of one of the multiple stacked cores 10 arranged along the X-axis are respectively arranged on the third side 3 and the fourth side 4, and the positive electrode tab 102 and the negative electrode tab 103 of the remaining stacked cores 10 in the multiple stacked cores 10 arranged along the X-axis are respectively arranged on the third side 3 and the fourth side 4; the positive electrode connecting portion 302 further includes a third connecting member 3024 and a fourth connecting member 3022, the third connecting member 3024 is located on the third side 3, one end of the third connecting member 3024 is connected to the positive electrode lead-out terminal 301, the other end of the third connecting member 3024 is connected to one end of the first connecting member 3021, the third connecting member 3024 is connected to the positive electrode tab 102 located on the third side 3, the fourth connecting member 3022 is located on the fourth side 4, and the fourth connecting member 3022 is connected to the other end of the first connecting member 3021 The fourth connector 3022 has a positive electrode connection end 3023, which is connected to the positive electrode ear 102 located on the fourth side 4, and the fourth connector 3022 is provided with a negative electrode avoidance area 303; the negative electrode connection part 402 also includes a fifth connector 4024 and a sixth connector 4022, the fifth connector 4024 is located on the third side 3, one end of the fifth connector 4024 is connected to the negative electrode lead-out terminal 401, the other end of the fifth connector 4024 is connected to one end of the second connector 4021, the fifth connector 4024 is connected to the negative electrode ear 103 located on the third side 3, the sixth connector 4022 is located on the fourth side 4, the sixth connector 4022 is connected to the other end of the second connector 4021, the sixth connector 4022 has a negative electrode connection end 4023, the negative electrode connection end 4023 is connected to the negative electrode ear 103 located on the fourth side 4, and the sixth connector 4022 is provided with a positive electrode avoidance area 403.

[0076] In the above technical solution, on the one hand, with the introduction of the third connecting member 3024, the positive electrode ear 102 on the third side 3 can be connected to the third connecting member 3024, and with the introduction of the fifth connecting member 4024, the negative electrode ear 103 on the third side 3 can be connected to the fifth connecting member 4024. In this way, not only the complexity of the electrical connection operation is simplified, but also the reliability of the electrical connection is improved; on the other hand, the design of the positive electrode connection terminal 3023 ensures a stable connection between the positive electrode ear 102 on the fourth side 4 and the fourth connecting member 3022, and the design of the negative electrode connection terminal 4023 ensures a stable connection between the negative electrode ear 103 on the fourth side 4 and the sixth connecting member 4022, thereby improving the reliability of the electrical contact and reducing faults and safety hazards caused by poor contact.

[0077] It should be noted that, in the embodiment of the present invention, the negative electrode tab 103 and the positive electrode tab 102 of one of the multiple stacked cores 10 arranged along the X-axis are respectively arranged on the third side 3 and the fourth side 4, and the positive electrode tabs 102 and the negative electrode tabs 103 of the remaining stacked cores 10 in the multiple stacked cores 10 arranged along the X-axis are respectively arranged on the third side 3 and the fourth side 4, which means that the arrangement direction of the negative electrode tab 103 and the positive electrode tab 102 of one of the stacked cores 10 is opposite to the arrangement direction of the positive electrode tab 102 and the negative electrode tab 103 of each of the remaining stacked cores 10; for example, the number of the multiple stacked cores 10 arranged along the X-axis is four, and the negative electrode tab 103 and the positive electrode tab 103 of one of the four stacked cores 10 are respectively arranged on the third side 3 and the fourth side 4. The tabs 102 are respectively arranged on the third side 3 and the fourth side 4, the positive tabs 102 of the remaining three stacked cores 10 of the four stacked cores 10 are respectively arranged on the third side 3, and the negative tabs 103 of the remaining three stacked cores 10 of the four stacked cores 10 are respectively arranged on the fourth side 4; for example, the number of the multiple stacked cores 10 arranged along the X-axis is five, the negative tab 103 and the positive tab 102 of one stacked core 10 of the five stacked cores 10 are respectively arranged on the third side 3 and the fourth side 4, the positive tabs 102 of the remaining four stacked cores 10 of the five stacked cores 10 are respectively arranged on the third side 3, and the negative tabs 103 of the remaining four stacked cores 10 of the five stacked cores 10 are respectively arranged on the fourth side 4.

[0078] Specifically, in the embodiment of the present invention, the remaining cores 10 refer to the other cores 10 except one core 10 among the multiple cores 10 , the positive tabs 102 of these cores 10 are located on the third side 3 , and the negative tabs 103 of these cores 10 are located on the fourth side 4 .

[0079] Specifically, as shown in Figures 6(a) and 6(b), in an embodiment of the present invention, by providing a negative electrode avoidance area 303, the fourth connector 3022 can pass over the negative electrode ear 103 located on the fourth side 4 and then be connected to the positive electrode ear 102. In this way, the fourth connector 3022 can be prevented from overlapping with the negative electrode ear 103 on the fourth side 4, thereby avoiding the occurrence of a short circuit; by providing a positive electrode avoidance area 403, the sixth connector 4022 can pass over the positive electrode ear 102 located on the fourth side 4 and then be connected to the negative electrode ear 103. In this way, the sixth connector 4022 can be prevented from overlapping with the positive electrode ear 102 on the fourth side 4, thereby avoiding the occurrence of a short circuit.

[0080] Specifically, in the embodiment of the present invention, one end of the fourth connector 3022 is connected to the first connector 3021, and the other end of the fourth connector 3022 forms the positive electrode connection terminal 3023; one end of the sixth connector 4022 is connected to the second connector 4021, and the other end of the sixth connector 4022 forms the negative electrode connection terminal 4023.

[0081] like Figure 2As shown, in an embodiment of the present invention, the core stacking assembly further includes a plurality of bundling members 20, at least one of the plurality of bundling members 20 is arranged around the periphery of the stacking assembly along the circumference of the Y-axis, and the remaining bundling members 20 of the plurality of bundling members 20 are arranged around the periphery of the stacking assembly along the circumference of the X-axis.

[0082] In the above technical solution, the binding member 20 can be arranged around the outer periphery of the stacking assembly along the X-axis and Y-axis directions, so as to bundle the stacking assembly and prevent the displacement of each stacked core 10, thereby avoiding deformation of the stacked core assembly.

[0083] Specifically, in the embodiment of the present invention, the structure of the rectangular stacking assembly can make the end surfaces of the stacking assembly flush, so that the binding member 20 can bundle the stacking assembly.

[0084] Preferably, in an embodiment of the present invention, the binding member 20 is disposed around the periphery of the stacking assembly along the X-axis and the Y-axis.

[0085] In one embodiment, the binding member 20 may be disposed only along the X-axis around the circumference of the stacking assembly, or may be disposed only along the Y-axis around the circumference of the stacking assembly.

[0086] Example 1

[0087] Specifically, if Figures 1 to 14 As shown, in the first embodiment of the present invention, there are two stacked core assembly units 100, which are stacked along the Z axis. Each stacked core assembly unit 100 includes two stacked cores 10. At this time, the size of a single stacked core 10 satisfies M=2*N. Figure 2 As shown, first, two sets of single stacked cores 10 are arranged along the X direction to form a stacked core assembly unit 100, and then two sets of single stacked cores 10 are placed on the upper surface of the stacked core assembly unit 100. At this time, the two sets of single stacked cores 10 located on the upper side are arranged along the Y direction. Finally, the four stacked cores 10 are fixed by the binding member 20. In this way, Figure 2 The positive tabs 102 and negative tabs 103 of the two stacked cores 10 in the lower stacked core assembly are oriented in opposite directions (i.e., one positive tab 102 of the two stacked cores 10 is located on the third side 3, and the other positive tab 102 of the two stacked cores 10 is located on the fourth side 4; one negative tab 103 of the two stacked cores 10 is located on the third side 3, and the other negative tab 103 of the two stacked cores 10 is located on the fourth side 4), and the two positive tabs 102 of the upper stacked core combination unit 100 are located on the first side 1, and the two negative tabs 103 are located on the second side 2.

[0088] Specifically, in the first embodiment of the present invention, one negative electrode avoidance region 303 is provided, and the negative electrode avoidance region 303 is provided between the two ends of the fourth connector 3022 , and one positive electrode avoidance region 403 is provided, and the positive electrode avoidance region 403 is provided between the two ends of the sixth connector 4022 .

[0089] Specifically, as shown in Figure 6(b), in Example 1 of the present invention, there is one positive electrode connection terminal 3023, which extends along the Z axis and is connected to the positive electrode ear 102 located on the fourth side 4. There is one negative electrode connection terminal 4023, which extends along the Z axis and is connected to the negative electrode ear 103 located on the fourth side 4. In this way, when there are two stacked core combination units 100, each stacked core combination unit 100 includes two stacked cores 10, the positive electrode connection terminal 3023 can be connected to the positive electrode ear located on the fourth side 4, and the negative electrode connection terminal 4023 can be connected to the negative electrode ear 103 located on the fourth side 4.

[0090] Example 2

[0091] like Figure 15 As shown in FIG16( a ) and FIG16 ( b ), the difference between the second embodiment and the first embodiment is that the number of the stacked core assembly units 100 , the positive electrode connection terminals 3023 , and the negative electrode connection terminals 4023 are different.

[0092] Preferably, there are three stacked core assembly units 100, which are stacked along the Z axis. Each stacked core assembly unit 100 includes two stacked cores 10. Along the Z axis, two sets of single stacked cores 10 are first arranged along the X direction to form a first stacked core assembly unit 100, and then two sets of single stacked cores 10 are placed on the upper surface of the stacked core assembly unit 100. At this time, the two sets of single stacked cores 10 located above are arranged along the Y direction to form a second stacked core assembly unit 100, and then two sets of single stacked cores 10 are arranged along the X direction to form a third stacked core assembly unit 100, and the third stacked core assembly unit 100 is placed above the second stacked core assembly unit 100. The six stacked cores 10 are fixed by the binding member 20. In this way, Figure 15 The positive tabs 102 of the two stacked cores 10 of the first stacked core assembly unit 100 are oriented in opposite directions (one positive tab 102 of one of the two stacked cores 10 is located on the third side 3, and the positive tab 102 of the other stacked core 10 is located on the fourth side 4). The same is true for the third stacked core assembly unit 100. The two positive tabs 102 of the two stacked cores 10 of the second stacked core assembly unit 100 are located on the first side 1, and the two negative tabs 103 are located on the second side 2.

[0093] Specifically, in the second embodiment of the present invention, there is one negative electrode avoidance area 303 , and the negative electrode avoidance area 303 is set between the two ends of the fourth connecting member 3022 , and there is one positive electrode avoidance area 403 , and the positive electrode avoidance area 403 is set between the two ends of the sixth connecting member 4022 .

[0094] like Figure 15 16(a) and 16(b), in the second embodiment of the present invention, there are A stacked core assembly units 100, each stacked core assembly unit 100 includes two stacked cores 10, and the number of positive electrode connection terminals 3023 is The negative electrode connection terminal 4023 is indivual, The positive electrode connection terminals 3023 are spaced apart along the Z axis. The negative electrode connection terminals 4023 are spaced apart along the Z axis, where A is a positive integer greater than 2.

[0095] In the above technical solution, when the number of the stacked core assembly units 100 is A (greater than two), and each stacked core assembly unit 100 includes two stacked cores 10, The positive electrode connection terminal can be connected to the positive electrode ear 102 located on the fourth side. The negative electrode connection terminal 4023 can be connected to the negative electrode tab 103 located on the fourth side.

[0096] It should be noted that, in the embodiments of the present invention, is the symbol for rounding up to an integer, for example, if A=3, then

[0097] Preferably, in the second embodiment of the present invention, there are two positive electrode connection terminals 3023, the two positive electrode connection terminals 3023 are spaced apart along the Z axis, each positive electrode connection terminal 3023 extends along the X axis, and the two positive electrode connection terminals 3023 are respectively connected to the positive electrode ear 102 located on the first layer of the fourth side 4 and the positive electrode ear 102 located on the third layer of the fourth side 4; there are two negative electrode connection terminals 4023, the two negative electrode connection terminals 4023 are spaced apart along the Z axis, each negative electrode connection terminal 4023 extends along the X axis, and the two negative electrode connection terminals 4023 are respectively connected to the negative electrode ear 103 located on the first layer of the fourth side 4 and the negative electrode ear 103 located on the third layer of the fourth side 4.

[0098] The other structures of the second embodiment are the same as those of the first embodiment and will not be described again here.

[0099] Example 3

[0100] like Figure 1718(a) and 18(b), the difference between the third embodiment and the first embodiment is that the number of stacked cores 10 and the number of negative electrode connection terminals 4023 of each stacked core assembly unit 100 are different. There are two stacked core assembly units 100, and the two stacked core assembly units 100 are stacked along the Z axis. Each stacked core assembly unit 100 includes B stacked cores 10, one positive electrode connection terminal 3023, and B-1 negative electrode connection terminals 4023. The B-1 negative electrode connection terminals 4023 are spaced apart along the X axis, where B is a positive integer greater than 2.

[0101] In the above technical solution, when there are two stacked core assembly units 100 and each stacked core assembly unit 100 includes B stacked cores 10, the positive electrode connection terminal 3023 can be connected to the positive electrode tab 102 located on the fourth side 4, and B-1 negative electrode connection terminals 4023 can be connected to the negative electrode tab 103 located on the fourth side 4.

[0102] Preferably, in the third embodiment of the present invention, B=3, firstly, three single stacked cores 10 are arranged along the X direction to form a stacked core assembly unit 100, and then three single stacked cores 10 are placed on the upper surface of the stacked core assembly unit 100. At this time, the three single stacked cores 10 located on the upper side are arranged along the Y direction. Finally, the six stacked cores 10 are fixed by the binding member 20. In this way, the positive tabs 102 of two of the three single stacked cores 10 of the stacked core assembly unit 100 located at the lower side are aligned. On the third side 3 , the negative electrode tab 103 of the remaining one of the three single stacked cores 10 is located on the third side 3 . Similarly, the negative electrode tabs 103 of two of the three single stacked cores 10 of the stacked core combination unit 100 located below are located on the fourth side 4 , and the positive electrode tab 102 of the remaining one of the three single stacked cores 10 is located on the fourth side 4 . The three positive electrode tabs 102 of the stacked core combination unit 100 located above are located on the first side 1 , and the three negative electrode tabs 103 are located on the second side 2 .

[0103] Specifically, in the third embodiment of the present invention, one negative electrode avoidance region 303 is provided, and the negative electrode avoidance region 303 is disposed between the two ends of the fourth connector 3022. One positive electrode avoidance region 403 is provided, and the positive electrode avoidance region 403 is disposed between the two ends of the sixth connector 4022. Preferably, in the third embodiment of the present invention, there are two negative electrode connection terminals 4023, which are spaced apart along the X-axis and each negative electrode connection terminal 4023 extends along the Z-axis. There is one positive electrode connection terminal 3023, which extends along the Z-axis. The positive electrode connection terminal 3023 is connected to the positive electrode tab 102 located on the fourth side 4, and the two negative electrode connection terminals 4023 are connected to the two negative electrode tabs 103 located on the fourth side 4.

[0104] The other structures of the third embodiment are the same as those of the first embodiment and will not be described again here.

[0105] Specifically, in the embodiments of the present invention, embodiment 1 of the present invention provides an example of a state of four stacked cores assembled in parallel, and embodiments 2 and 3 of the present invention provide examples of a state of six stacked cores assembled in parallel, but the present invention does not limit the specific number of stacked cores 10 in parallel in the stacked core assembly. When the size of the stacked core 10 satisfies the following conditions: M = X*N (X is a positive integer ≥2, and X is the number of stacked cores 10), the number of stacked layers of the stacked core assembly unit 100 along the Z-axis direction is K (K is a positive integer ≥2), then the number of stacked cores 10 in the stacked core assembly = X*K.

[0106] As shown in Figure 6(a), Figure 6(b), Figure 8 、 Figure 9 、 Figure 10 、 Figure 13 、 Figure 14 、 Figure 15 、 Figures 17 to 20 As shown, an embodiment of the present invention provides a lithium battery. The lithium battery includes: a housing 80; the aforementioned stacked core assembly, located within the housing 80; a cover plate assembly 60, connected to the housing 80. The cover plate assembly 60 has a positive electrode post 605 and a negative electrode post 606. The positive lead 301 of the stacked core assembly is connected to the positive electrode post 605 of the cover plate assembly 60, and the negative lead 401 of the stacked core assembly is connected to the negative electrode post 606 of the cover plate assembly 60.

[0107] In the above technical solution, on the one hand, by placing the core stack assembly in the outer shell 80, multiple core stacks 10 can be arranged in parallel and densely stacked. Compared with the prior art in which a single core stack 10 is placed in the outer shell 80 to form a single battery and multiple single batteries are connected through connectors, this embodiment can significantly improve the energy density of the battery, that is, the amount of electrical energy stored per unit volume; on the other hand, the connection between the positive lead-out terminal 301 and the positive electrode column 605, and the connection between the negative lead-out terminal 401 and the negative electrode column 606, simplifies the internal electrical connection structure of the lithium battery and improves the reliability and stability of the electrical connection.

[0108] like Figures 8 to 14 As shown, in an embodiment of the present invention, the outer shell 80 is a cylindrical structure with an internal through hole, and the lithium battery also includes a partition assembly 70, which is arranged in the internal through hole. The partition assembly 70 divides the internal through hole into two accommodating chambers, and the partition assembly 70 includes an insulating plate 702, and the insulating plate 702 is provided with a plurality of through holes 703. The plurality of through holes 703 are used to connect two adjacent accommodating chambers, and each accommodating chamber is provided with a stacked core assembly, and there are two cover plate assemblies 60, and the two cover plate assemblies 60 are respectively connected to the two ends of the outer shell 80.

[0109] In the above technical solution, on the one hand, the introduction of the partition assembly 70 divides the internal space of the outer shell 80 into two independent accommodating chambers, and the stacked core assembly in each chamber can operate independently to improve the energy density of the lithium battery; on the other hand, the two independent cover assemblies 60 are respectively connected to the two ends of the outer shell 80, which simplifies the assembly process of the lithium battery; on the other hand, the design of multiple through holes 703 allows the electrolyte to flow freely between the two accommodating chambers, ensuring the uniform distribution of the electrolyte inside the lithium battery, thereby improving the charging and discharging efficiency and overall performance of the lithium battery.

[0110] Specifically, in an embodiment of the present invention, the cover plate assembly 60 includes an insulating bottom plate 601, a substrate 602, an injection hole 603 and an explosion-proof valve 604. A positive electrode column 605 and a negative electrode column 606 are provided on the substrate 602. An injection hole 603 and an explosion-proof valve 604 are also provided on the substrate 602. The substrate 602 is arranged on the side of the insulating bottom plate 601 away from the stacking assembly. The positive electrode column 605 and the negative electrode column 606 both pass through the insulating bottom plate 601 and are respectively connected to the positive electrode lead-in terminal 301 and the negative electrode lead-in terminal 401.

[0111] Specifically, in an embodiment of the present invention, the stacked core assemblies on both sides of the separator assembly 70 are independent of each other, and the electrolyte can move freely through the through holes 703 on the separator assembly 70. The separator assembly 70 can isolate the stacked core assemblies on both sides so that the stacked core assemblies on both sides cannot contact each other, thereby avoiding the risk of short circuit.

[0112] In one embodiment, since the electrolyte can flow in the two stacked core assemblies through the through holes 703 on the separator assembly 70 , a liquid injection hole 603 can be opened on one of the two substrates 602 .

[0113] like Figures 11 to 13 As shown, in the embodiment of the present invention, the partition assembly 70 further includes a buffer member 701 , which is disposed on the outer periphery of the insulating plate 702 and cooperates with the inner wall surface of the housing 80 .

[0114] Through the above arrangement, the buffer member 701 can be closely attached to the inner wall of the housing 80, thereby preventing the partition assembly 70 from being tilted due to shaking.

[0115] Specifically, in the embodiment of the present invention, the buffer member 701 is a soft gasket, a groove is provided on the outer periphery of the insulating plate 702, and the buffer member 701 is disposed in the groove.

[0116] Specifically, in the embodiment of the present invention, the stacked core assembly further includes an insulating film 50 , which surrounds the Y-axis and covers the four sides of the stacked core assembly.

[0117] The above-mentioned lithium battery has all the advantages of the above-mentioned stacked core assembly, which will not be described in detail here.

[0118] like Figures 1 to 20 As shown, an embodiment of the present invention provides a lithium battery assembly method (method 1). The lithium battery assembly method is used to form the above-mentioned lithium battery, and the lithium battery assembly method includes: splicing a plurality of stacked cores 10 to form a stack assembly; attaching a positive electrode connecting member 30 and a negative electrode connecting member 40 to the outer periphery of the stack assembly, connecting a plurality of positive electrode tabs 102 to the positive electrode connecting member 30, and connecting a plurality of negative electrode tabs 103 to the negative electrode connecting member 40 to form a stacked core assembly.

[0119] In the above technical solution, multiple stacked cores 10 are spliced ​​along the X-axis direction or the Y-axis direction to form a stacked core assembly unit 100, and multiple stacked core assembly units 100 are stacked along the Z-axis direction to form a stacked assembly. The positive electrode connecting member 30 and the negative electrode connecting member 40 are respectively attached to the outer periphery of the stacked assembly, and multiple positive electrode ears 102 are connected to the positive electrode connecting member 30, and multiple negative electrode ears 103 are connected to the negative electrode connecting member 40. In this way, a stacked core assembly can be formed. In this way, compared with the prior art of placing a single stacked core 10 in a single shell to form a single battery, and then connecting multiple single batteries in parallel to obtain a PACK package, in this embodiment, the situation where one stacked core 10 is configured with one shell can be avoided, which significantly improves the space utilization of the PACK package, thereby improving the energy density in the PACK package.

[0120] Specifically, in the fourth embodiment of the present invention, the lithium battery assembly method further includes: after splicing the plurality of stacked cores 10 to form a stack assembly, winding the plurality of binding members 20 around the outer circumference of the stack assembly along the X-axis and the Y-axis.

[0121] Preferably, in the embodiment of the present invention, the plurality of positive electrode tabs 102 are connected to the positive electrode connecting member 30 by welding, and the same is true for the negative electrode tabs 103 .

[0122] like Figure 8 and Figure 9 As shown, in an embodiment of the present invention, the assembly method of the lithium battery further includes: wrapping the insulating film 50 around the Y axis in the circumference of the stacked core assembly and exposing the positive lead-in terminal 301 and the negative lead-in terminal 401; welding the positive lead-in terminal 301 of the stacked core assembly to the positive electrode column 605 of the cover plate assembly 60; welding the negative lead-in terminal 401 of the stacked core assembly to the negative electrode column 606 of the cover plate assembly 60; bending the positive lead-in terminal 301 and the negative lead-in terminal 401, and covering the cover plate assembly 60 on the stacked core assembly; placing the stacked core assembly in the outer shell 80, and welding the cover plate assembly 60 to the outer shell 80 to form a lithium battery.

[0123] In the above technical solution, after the core stacking assembly is formed, an insulating film 50 is used to cover the circumference of the core stacking assembly to ensure that the positive lead-in terminal 301 and the negative lead-in terminal 401 are exposed, so as to facilitate the connection between the core stacking assembly and the cover plate assembly 60, and the positive lead-in terminal 301 of the core stacking assembly is welded to the positive electrode column 605 of the cover plate assembly 60, and the negative lead-in terminal 401 of the core stacking assembly is welded to the negative electrode column 606 of the cover plate assembly, and the positive lead-in terminal 301 and the negative lead-in terminal 401 are bent so that they form a certain angle with the core stacking assembly, and the cover plate assembly 60 is placed on the core stacking assembly to ensure that the cover plate assembly 60 is tightly fitted to the core stacking assembly, and the core stacking assembly is placed in the outer shell 80, and then the cover plate assembly 60 is welded to the shell opening of the outer shell 80 to form a lithium battery.

[0124] Specifically, in an embodiment of the present invention, the assembly method of the lithium battery also includes: placing a partition assembly 70 in the outer shell 80, and the buffer member 701 is tightly attached to the inner wall of the outer shell 80, so that the partition assembly 70 can be prevented from tilting due to shaking. The inner space of the outer shell 80 is divided into two independent accommodating cavities by the partition assembly 70, and two sets of cover plate assemblies 60 and the stacked core assembly are respectively placed in the two accommodating cavities, and finally the substrate 602 of the cover plate assembly 60 is welded to the shell mouth of the outer shell 80 to form a lithium battery.

[0125] Specifically, in the embodiment of the present invention, the bending angles of the positive electrode lead-out terminal 301 and the negative electrode lead-out terminal 401 are both 90°.

[0126] In one embodiment (method 2), as Figures 19 to 20 As shown, the difference between method 2 and method 1 is that the core stack assembly can be placed in the outer shell 80 first and then the cover plate assembly 60 is welded to the core stack assembly. The assembly method of the lithium battery also includes: placing the core stack assembly in the outer shell 80; welding the positive lead-out terminal 301 of the core stack assembly to the positive electrode column 605 of the cover plate assembly 60; welding the negative lead-out terminal 401 of the core stack assembly to the negative electrode column 606 of the cover plate assembly 60; bending the positive lead-out terminal 301 and the negative lead-out terminal 401; covering the cover plate assembly 60 on the outer shell 80, and welding the cover plate assembly 60 and the outer shell 80 to form a lithium battery.

[0127] In the above technical solution, the core stack assembly is placed in the outer shell 80, the positive lead-out terminal 301 of the core stack assembly is welded to the positive electrode column 605 on the cover plate assembly 60, and the negative lead-out terminal 401 is laser welded to the negative electrode column 606 on the cover plate assembly 60. After welding is completed, the positive lead-out terminal 301 and the negative lead-out terminal 401 are bent to form a certain angle with the core stack assembly, and the cover plate assembly 60 is covered on the core stack assembly. Then, the cover plate assembly 60 is welded to the shell opening of the outer shell 80 to form a lithium battery, wherein the substrate 602 of the cover plate assembly 60 is welded to the shell opening of the outer shell 80 to form a lithium battery.

[0128] Specifically, the stacked core assemblies of the first embodiment, the second embodiment, and the third embodiment can all be assembled according to the first assembly method ( Figure 8 and Figure 9 ) or assembly method 2 ( Figure 19 and Figure 20 ) are assembled to obtain a complete lithium battery.

[0129] It should be noted that in the embodiment of the present invention, for the stacked core assembly, the present invention can realize the parallel connection of any number of stacked cores 10, thereby improving the process adaptability. Compared with the traditional solution, the present invention places two sets of stacked core assemblies in the outer shell 80. The two sets of stacked core assemblies are independent of each other, which can effectively improve the energy density of the single lithium battery.

[0130] The assembly method of the above-mentioned lithium battery has all the advantages of the above-mentioned lithium battery and will not be described in detail here.

[0131] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: on the one hand, the use of the first connector and the second connector simplifies the electrical connection between multiple stacked cores. This connection method enables the positive electrode ear located on the first side to be connected to the first connector at one time, and the negative electrode ear and the negative electrode ear located on the second side to be connected to the second connector at one time, thereby reducing operation time and the possibility of operation errors; on the other hand, the positive electrode ear is located on the first side of the stacking assembly, the negative electrode ear is located on the second side of the stacking assembly, and the first connector is attached to the first side and the second connector is attached to the second side, which can achieve electrical isolation, avoid direct contact between the positive electrode ear and the negative electrode ear, significantly reduce the risk of short circuit, and enhance the safety of the stacked core assembly.

[0132] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A stacked core assembly, characterized in that: include: A stacking assembly comprises a plurality of stacked core assembly units (100) stacked in sequence along the Z axis, wherein the stacked core assembly unit (100) comprises a plurality of stacked cores (10) arranged in parallel along the X axis or the Y axis, wherein the stacked core (10) comprises a stacked core body (101), a positive electrode tab (102) and a negative electrode tab (103); A positive electrode connecting member (30) comprises a positive electrode connecting portion (302) and a positive electrode lead-out terminal (301) connected to the positive electrode connecting portion (302); a negative electrode avoidance region (303) is provided on the positive electrode connecting portion (302); the negative electrode avoidance region (303) is used to avoid at least one negative electrode tab (103); and a plurality of positive electrode tabs (102) are all connected to the positive electrode connecting portion (302); A negative electrode connecting member (40) comprises a negative electrode connecting portion (402) and a negative electrode lead-out terminal (401) connected to the negative electrode connecting portion (402); a positive electrode avoidance region (403) is provided on the negative electrode connecting portion (402); the positive electrode avoidance region (403) is used to avoid at least one positive electrode tab (102); and a plurality of negative electrode tabs (103) are all connected to the negative electrode connecting portion (402).

2. The stacked core assembly according to claim 1, wherein: The positive electrode connecting member (30) and the negative electrode connecting member (40) are electrically isolated from each other, the positive electrode connecting portion (302) is attached to the outer peripheral side of the stacking assembly, and the positive electrode lead-out terminal (301) protrudes from the stacking assembly; the negative electrode connecting portion (402) is attached to the outer peripheral side of the stacking assembly, and the negative electrode lead-out terminal (401) protrudes from the stacking assembly.

3. The stacked core assembly according to claim 1, wherein: The plurality of stacked cores (10) of one of the two adjacent stacked core assembly units (100) are arranged in parallel along the X-axis, and the plurality of stacked cores (10) of the other of the two adjacent stacked core assembly units (100) are arranged in parallel along the Y-axis, wherein the length of the stacked core body (101) is M, the width of the stacked core body (101) is N, and M=X*N, and the number of the stacked cores (10) of each stacked core assembly unit (100) is X.

4. The stacked core assembly according to claim 3, characterized in that: Along the X-axis, the stack assembly has a first side (1) and a second side (2) arranged opposite to each other, the positive electrode connection portion (302) includes a first connection member (3021), the first connection member (3021) is attached to the first side (1), and the positive electrode tabs (102) of the plurality of stacked cores (10) arranged along the Y-axis are located on the first side (1) and connected to the first connection member (3021); The negative electrode connection portion (402) includes a second connection member (4021), the second connection member (4021) is attached to the second side (2), and the negative electrode ears (103) of the plurality of stacked cores (10) arranged along the Y axis are located on the second side (2) and connected to the second connection member (4021).

5. The stacked core assembly according to claim 4, characterized in that: Along the Y-axis, the stacking assembly has a third side (3) and a fourth side (4) arranged opposite to each other, the negative electrode tab (103) and the positive electrode tab (102) of one of the plurality of stacked cores (10) arranged along the X-axis are respectively arranged on the third side (3) and the fourth side (4), and the positive electrode tab (102) and the negative electrode tab (103) of the remaining plurality of stacked cores (10) arranged along the X-axis are respectively arranged on the third side (3) and the fourth side (4); The positive electrode connection portion (302) further includes a third connection member (3024) and a fourth connection member (3022), wherein the third connection member (3024) is located on the third side (3), one end of the third connection member (3024) is connected to the positive electrode lead-out terminal (301), and the other end of the third connection member (3024) is connected to one end of the first connection member (3021), and the third connection member (3024) is connected to the positive electrode ear located on the third side (3). (102), the fourth connector (3022) is located on the fourth side (4), the fourth connector (3022) is connected to the other end of the first connector (3021), the fourth connector (3022) has a positive electrode connection end (3023), the positive electrode connection end (3023) is connected to the positive electrode ear (102) located on the fourth side (4), and the fourth connector (3022) is provided with the negative electrode avoidance area (303); The negative electrode connection portion (402) further includes a fifth connection member (4024) and a sixth connection member (4022), wherein the fifth connection member (4024) is located on the third side (3), one end of the fifth connection member (4024) is connected to the negative electrode lead-out terminal (401), and the other end of the fifth connection member (4024) is connected to one end of the second connection member (4021), and the fifth connection member (4024) is connected to the negative electrode ear located on the third side (3). (103), the sixth connector (4022) is located on the fourth side (4), the sixth connector (4022) is connected to the other end of the second connector (4021), the sixth connector (4022) has a negative electrode connection end (4023), the negative electrode connection end (4023) is connected to the negative electrode ear (103) located on the fourth side (4), and the sixth connector (4022) is provided with the positive electrode avoidance area (403).

6. The stacked core assembly according to claim 5, characterized in that: There are two stacked core assembly units (100), each stacked core assembly unit (100) includes two stacked cores (10), one positive electrode connection terminal (3023), and one negative electrode connection terminal (4023); or, There are A stacked core assembly units (100), each stacked core assembly unit (100) includes two stacked cores (10), and the number of the positive electrode connection terminals (3023) is The negative electrode connection terminal (4023) is The positive electrode connection terminals (3023) are spaced apart along the Z axis, The negative electrode connection terminals (4023) are spaced apart along the Z axis, wherein A is a positive integer greater than 2; or There are two stacked core assembly units (100), each stacked core assembly unit (100) includes B stacked cores (10), one positive electrode connection terminal (3023), and B-1 negative electrode connection terminals (4023), and the B-1 negative electrode connection terminals (4023) are arranged at intervals along the X-axis, wherein B is a positive integer greater than 2.

7. The stacked core assembly according to any one of claims 1 to 6, characterized in that: The stacked core assembly further comprises a plurality of bundling members (20), at least one of the plurality of bundling members (20) being arranged around the periphery of the stacking assembly along the circumference of the Y axis, and the remaining plurality of bundling members (20) being arranged around the periphery of the stacking assembly along the circumference of the X axis.

8. A lithium battery, characterized in that: include: housing (80); The stacked core assembly according to any one of claims 1 to 7, located within the housing (80); A cover plate assembly (60) is connected to the housing (80), the cover plate assembly (60) having a positive pole (605) and a negative pole (606), the positive lead-out terminal (301) of the stacked core assembly is connected to the positive pole (605) of the cover plate assembly (60), and the negative lead-out terminal (401) of the stacked core assembly is connected to the negative pole (606) of the cover plate assembly (60).

9. The lithium battery according to claim 8, characterized in that The shell (80) is a cylindrical structure with an internal through hole. The lithium battery also includes a partition assembly (70). The partition assembly (70) is arranged in the internal through hole. The partition assembly (70) divides the internal through hole into two accommodating chambers. The partition assembly (70) includes an insulating plate (702). The insulating plate (702) is provided with a plurality of through holes (703). The plurality of through holes (703) are used to connect two adjacent accommodating chambers. Each of the accommodating chambers is provided with a stacked core assembly. There are two cover plate assemblies (60). The two cover plate assemblies (60) are respectively connected to the two ends of the shell (80).

10. The lithium battery according to claim 9, characterized in that The partition assembly (70) further includes a buffer member (701), the buffer member (701) being arranged on the outer periphery of the insulating plate (702), and the buffer member (701) being matched with the inner wall surface of the outer shell (80).

11. A method for assembling a lithium battery, characterized in that: The lithium battery according to claim 10 is formed by using the lithium battery assembly method, and the lithium battery assembly method comprises: splicing a plurality of the stacked cores (10) to form the stacked assembly; The positive electrode connecting member (30) and the negative electrode connecting member (40) are respectively attached to the outer periphery of the stacking assembly, a plurality of the positive electrode tabs (102) are connected to the positive electrode connecting member (30), and the negative electrode tabs (103) are connected to the negative electrode connecting member (40) to form the stacked core assembly.

12. The lithium battery assembly method according to claim 11, characterized in that: The lithium battery assembly method further includes: An insulating film (50) is wrapped around the Y axis in the circumference of the stacked core assembly, exposing the positive electrode lead-out terminal (301) and the negative electrode lead-out terminal (401); Welding the positive electrode lead-out terminal (301) of the stacked core assembly to the positive electrode column (605) of the cover plate assembly (60); Welding the negative electrode lead-out terminal (401) of the stacked core assembly to the negative electrode column (606) of the cover plate assembly (60); Bending the positive electrode lead-out terminal (301) and the negative electrode lead-out terminal (401), and placing the cover plate assembly (60) on the stacked core assembly; The stacked core assembly is placed in the outer shell (80), and the cover plate assembly (60) is welded to the outer shell (80) to form the lithium battery.

13. The lithium battery assembly method according to claim 11, characterized in that: The lithium battery assembly method further includes: placing the stacked core assembly in the housing (80); Welding the positive electrode lead-out terminal (301) of the stacked core assembly to the positive electrode column (605) of the cover plate assembly (60); Welding the negative electrode lead-out terminal (401) of the stacked core assembly to the negative electrode column (606) of the cover plate assembly (60); Bending the positive electrode lead-out terminal (301) and the negative electrode lead-out terminal (401); The cover plate assembly (60) is covered on the outer shell (80), and the cover plate assembly (60) and the outer shell (80) are welded to form the lithium battery.

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