A dual cell battery and battery pack

Abstract

The application provides a double-cell battery and a battery pack. A first cell is arranged in a first shell and surrounded by the first shell. A second cell is arranged in a second shell and surrounded by the second shell. A tab of the first cell extends out of a first opening of the first shell, and a tab of the second cell extends out of a second opening of the second shell. A connecting assembly is used to connect the first opening and the second opening, so that the first shell and the second shell are in communication. The first cell and the second cell are arranged in the first shell and the second shell respectively, and the first shell and the second shell are in communication through the connecting assembly. The length of the double-cell battery is at least the sum of the lengths of the first cell and the second cell, so that the scheme of a hard-shell cell with a relatively long length is realized. The double-cell battery structure provided by the application does not need to adopt a plurality of soft packages in series, the overall process is simple, and the internal space utilization rate of the double-cell battery is high.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a dual-cell battery and battery pack. Background Technology

[0002] To improve the space utilization of battery packs, current power batteries are developing towards longer cells, such as blade batteries and short blade batteries. One of the reasons is that when long cells are placed inside the battery pack, they can strengthen the structural strength of the battery pack, thereby reducing the need for internal reinforcing ribs.

[0003] When the battery cell is made longer, the difficulty of inserting the bare cell into the casing also increases. During the insertion process, the bare cell is prone to collision with the hard casing of the battery, which can cause damage. Therefore, the existing technology usually uses multiple shorter pouch cells connected in series, and then puts the series-connected pouch cells into the hard casing of the battery to form a longer hard-cased cell. However, connecting multiple pouch cells in series will lead to complex overall processes and low internal space utilization. Summary of the Invention

[0004] The purpose of this application is to provide a dual-cell battery and battery pack to solve the problems of existing long-cell batteries, such as the difficulty of inserting bare cells into the casing and the low utilization rate of the internal space of the battery.

[0005] This application provides a dual-cell battery, including a connection assembly, a first casing, a first cell, a second casing, and a second cell;

[0006] The first battery cell is disposed inside the first housing and is surrounded by the first housing;

[0007] The second battery cell is disposed inside the second housing and is surrounded by the second housing;

[0008] The tab of the first battery cell extends out of the first opening of the first housing, and the tab of the second battery cell extends out of the second opening of the second housing;

[0009] The connecting assembly is used to connect the first opening and the second opening, so that the first housing and the second housing are in communication.

[0010] In the above technical solution, the dual-cell battery includes a first cell and a second cell. The first cell and the second cell are respectively disposed in the first housing and the second housing, and the first housing and the second housing are connected by a connecting component. The length of the dual-cell battery is at least the sum of the lengths of the first cell and the second cell, thereby realizing a solution with a longer hard-shell cell. The lengths of the first cell and the second cell are relatively short, the difficulty of inserting the first cell and the second cell into the housing is relatively low, and there is no need to use multiple soft packs in series. The overall process is simple and the internal space utilization of the dual-cell battery is high.

[0011] In some alternative embodiments, the connection assembly includes an upper cover and a lower cover, which are connected to form a cavity with openings on both sides for accommodating the tabs of the first and second battery cells.

[0012] In the above technical solution, the lower shell cover can be a plate-shaped structure, and the upper shell cover can be a U-shaped structure. When the upper shell cover and the lower shell cover are connected, a cavity with openings on both sides is formed. The cavity is used to accommodate the tabs of the first battery cell extending out of the first shell and the tabs of the second battery cell extending out of the second shell.

[0013] In some alternative embodiments, the lower housing includes a substrate, a terminal post, and a sealing insulation element; the terminal post includes a terminal post bottom and a connecting portion; the terminal post bottom is connected to the tabs of the first battery cell and the second battery cell;

[0014] A sealing and insulating component is disposed between the substrate and the bottom of the pole post;

[0015] One end of the connecting part is connected to the bottom of the pole post, and the other end of the connecting part passes through the sealing insulation and extends out of the substrate.

[0016] In some alternative implementations, the bottom of the terminal post includes a positive terminal post bottom and a negative terminal post bottom, and the tabs of the first cell and the second cell respectively include a positive tab and a negative tab, with the bottom of the positive terminal post connected to the positive tab and the bottom of the negative terminal post connected to the negative tab.

[0017] In the above technical solution, the bottom of the positive terminal connects the positive electrode tabs of the first cell and the second cell to the positive terminal, and the bottom of the negative terminal connects the negative electrode tabs of the first cell and the second cell to the negative terminal. This achieves parallel connection of the first cell and the second cell inside the dual-cell battery. Furthermore, the first cell and the second cell share a terminal (where the terminal refers to the connecting component) that includes both the positive and negative terminals, thereby saving space in the length direction of the battery and improving the internal space utilization of the battery.

[0018] In some alternative embodiments, the sealing insulation includes a sealing ring, a first plastic and a second plastic; the lower cover also includes a conductive block;

[0019] A sealing ring is fitted onto the connecting part. One end of the connecting part is connected to the bottom of the pole post, and the other end of the connecting part passes through the second plastic, the substrate, and the first plastic in sequence before being connected to the conductive block.

[0020] In the above technical solution, the first plastic, the second plastic and the sealing ring have the effects of sealing and insulation. In addition, the second plastic also serves to limit the bottom of the pole post, and the first plastic also serves to limit the conduction block.

[0021] In some alternative implementations, the conductor block has a protrusion for welding to the busbar.

[0022] In the above technical solution, the conductive block has a protrusion, making the conductive block as a whole L-shaped. The L-shaped conductive block has a larger welding surface when welded to the busbar, and the L-shaped conductive block also provides a limiting effect on the busbar, thereby making it easier to weld the conductive block and the busbar together.

[0023] In some alternative embodiments, the length and width directions of the dual-cell battery extend horizontally, and the height direction of the dual-cell battery extends vertically; the top of the upper cover has a first through groove along the height direction, the depth of the first through groove is greater than the height of the protrusion, and the first through groove is used to accommodate the protrusion of another dual-cell battery when multiple dual-cell batteries are overlapped.

[0024] In the above technical solution, the top of the upper cover has a first through groove along the height direction, and the depth of the first through groove is greater than the height of the protrusion. In a battery pack in which multiple dual-cell batteries are attached and overlapped, the first through groove can simultaneously accommodate the busbar and the protrusion of the conductive block of the adjacent dual-cell battery.

[0025] In some alternative embodiments, the upper cover also has a second through groove on each side along the height direction, the second through groove being used for the passage of a busbar.

[0026] In the above technical solution, the upper cover has a second through groove on each side, one through groove is used for the busbar to pass through and connect to the positive electrode conductive block, and the other through groove is used for the busbar to pass through and connect to the negative electrode conductive block.

[0027] In some optional embodiments, an injection port and / or an explosion-proof valve are also included, with the first housing and the second housing being provided with the injection port and / or the explosion-proof valve.

[0028] In some optional embodiments, the first housing includes a first side housing surrounding the lengthwise side of the first battery cell, and a first cover plate disposed at a third opening at one end of the lengthwise side housing, the other end of the lengthwise side housing being the first opening; the first cover plate is used to cover the third opening, and a liquid injection hole and / or an explosion-proof valve may be disposed on the first cover plate.

[0029] In the above technical solution, the first side shell can be formed by bending and welding an aluminum plate of a certain thickness to form two openings on the left and right. No flange is present on any side of the first side shell, so it will not occupy more space in any direction of the battery pack.

[0030] In some optional embodiments, the second housing includes a second side housing surrounding the second battery cell along its length, and a second cover plate disposed at a fourth opening at one end of the second side housing along its length, the other end of the second side housing along its length being the second opening; the second cover plate is used to cover the fourth opening, and a liquid injection hole and / or an explosion-proof valve may be disposed on the second cover plate;

[0031] In the above technical solution, the second side shell can be formed by bending and welding an aluminum plate of a certain thickness to form two openings on the left and right. No flange is present on any side of the second side shell, so it will not occupy more space in any direction of the battery pack.

[0032] This application provides a battery pack including a busbar and a plurality of dual-cell batteries as described above, wherein the busbar is connected to the conductive block of the connection component of each dual-cell battery. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of a dual-cell battery provided in an embodiment of this application;

[0035] Figure 2 This is a schematic diagram of the disassembled structure of a dual-cell battery provided in an embodiment of this application;

[0036] Figure 3 This is a schematic diagram of the structure of the lower shell cover provided in an embodiment of this application;

[0037] Figure 4 This is a schematic diagram of the structure of the upper shell cover provided in an embodiment of this application;

[0038] Figure 5 A flowchart illustrating the steps of a method for preparing a dual-cell battery according to an embodiment of this application;

[0039] Figure 6 This is a schematic diagram of the structure of a battery pack provided in an embodiment of this application.

[0040] Icons: 1-First cell, 11-First positive tab, 12-First negative tab, 2-Second cell, 21-Second positive tab, 22-Second negative tab, 3-First housing, 31-First side housing, 32-First cover plate, 33-First opening, 34-Second opening, 35-Third opening, 36-Fourth opening, 4-Second housing, 41-Second side housing, 42-Second cover plate, 5-Connecting assembly, 5 1-Lower shell cover, 52-Upper shell cover, 53-Positive electrode post, 54-Negative electrode post, 55-First through groove, 56-Second through groove, 61-Bottom of positive electrode post, 611-Connecting part, 62-Second plastic, 63-First plastic, 64-Positive conductive block, 65-Substrate, 66-Bottom of negative electrode post, 67-Negative conductive block, 68-Sealing ring, 69-Protrusion, 7-Dual-cell battery, 8-Longitudinal beam, 9-Busbar. Detailed Implementation

[0041] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0042] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of a dual-cell battery 7 provided in an embodiment of this application; Figure 2 This is a schematic diagram of the disassembled structure of a dual-cell battery provided in an embodiment of this application. As shown in the figure, the dual-cell battery 7 includes a connecting assembly 5, a first housing 3, a first cell 1, a second housing 4, and a second cell 2; the first cell 1 is disposed inside the first housing 3 and surrounded by the first housing 3; the second cell 2 is disposed inside the second housing 4 and surrounded by the second housing 4; the tab of the first cell 1 extends out of the first opening 33 of the first housing 3, and the tab of the second cell 2 extends out of the second opening 34 of the second housing 4; the connecting assembly 5 is used to connect the first opening 33 and the second opening 34, so that the first housing 3 and the second housing 4 are in communication.

[0043] In this embodiment, the dual-cell battery 7 includes a first cell 1 and a second cell 2. The first cell 1 and the second cell 2 are respectively disposed within a first housing 3 and a second housing 4, and are connected to the second housing 4 by a connecting component 5. The length of the dual-cell battery 7 is at least the sum of the lengths of the first cell 1 and the second cell 2, thereby achieving a solution with a relatively long rigid-cased cell. The lengths of the first cell 1 and the second cell 2 are relatively short, making it easier to insert each of the first cell 1 and the second cell 2 into the casing. Furthermore, it eliminates the need for multiple soft-pack cells connected in series, resulting in a simple overall process and high internal space utilization of the dual-cell battery 7.

[0044] Specifically, please refer to Figure 2In some optional embodiments, the connecting assembly 5 includes an upper shell cover 52 and a lower shell cover 51. The upper shell cover 52 and the lower shell cover 51 are connected to form a cavity with openings on both sides. The cavity is used to accommodate the tabs of the first battery cell 1 and the second battery cell 2. In this embodiment, the lower shell cover 51 is a plate-shaped structure. The two long sides of the plate-shaped structure are welded to one wide side of the first housing 3 and the second housing 4, respectively. The upper shell cover 52 is a U-shaped structure. The two ends of the U-shaped structure are welded to the two wide sides of the plate-shaped lower shell cover 51, respectively. When the upper shell cover 52 and the lower shell cover 51 are welded together, a cavity with openings on both sides is formed. The cavity is used to accommodate the first positive electrode tab 11, the first negative electrode tab 12, the second positive electrode tab 21, and the second negative electrode tab 22. The first positive electrode tab 11 and the first negative electrode tab 12 are the two tabs of the first battery cell 1, and the first positive electrode tab 11 and the first negative electrode tab 12 extend out of the right side opening of the first housing 3; the second positive electrode tab 21 and the second negative electrode tab 22 are the two tabs of the second battery cell 2, and the second positive electrode tab 21 and the second negative electrode tab 22 extend out of the left side opening of the second housing 4.

[0045] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of the lower shell cover 51 provided in an embodiment of this application.

[0046] In some alternative embodiments, the lower casing includes a substrate, a positive terminal post, a negative terminal post, and a sealing and insulating member; the positive terminal post includes a positive terminal post bottom 61 and a connecting portion 611 at the center of the positive terminal post bottom 61; the negative terminal post includes a negative terminal post bottom 66 and a connecting portion 611 at the center of the negative terminal post bottom 66; the positive terminal post bottom 61 is connected to the positive terminal tabs of the first battery cell and the second battery cell, and the negative terminal post bottom 66 is connected to the negative terminal tabs of the first battery cell and the second battery cell;

[0047] A sealing insulating member is disposed between the substrate and the bottom of the positive electrode post 61; one end of the connecting portion 611 of the bottom of the positive electrode post 61 is connected to the bottom of the positive electrode post 61, and the other end of the connecting portion 611 passes through the sealing insulating member and extends out of the substrate. A sealing insulating member is disposed between the substrate and the bottom of the negative electrode post 66; one end of the connecting portion 611 of the bottom of the negative electrode post 66 is connected to the bottom of the negative electrode post 66, and the other end of the connecting portion 611 passes through the sealing insulating member and extends out of the substrate.

[0048] In this embodiment, the bottom 61 of the positive terminal connects the positive electrode tabs of the first cell 1 and the second cell 2 to the positive terminal 53, and the bottom 66 of the negative terminal connects the negative electrode tabs of the first cell 1 and the second cell 2 to the negative terminal 54. This achieves parallel connection of the first cell 1 and the second cell 2 inside the dual-cell battery 7. Furthermore, the first cell 1 and the second cell 2 share a terminal (the terminal here refers to the connecting component 5) that includes both the positive and negative terminals, thereby saving space in the length direction of the battery and improving the space utilization rate inside the battery.

[0049] In some alternative embodiments, the sealing insulation includes a sealing ring 68, a first plastic 63, and a second plastic 62; the lower cover also includes a positive electrode conductive block and a negative electrode conductive block;

[0050] A sealing ring 68 is fitted onto the connecting portion 611 of the bottom of the positive electrode post 61. One end of the connecting portion 611 is connected to the bottom of the positive electrode post 61, and the other end of the connecting portion passes through the second plastic 62, the substrate, and the first plastic 63 in sequence before being connected to the positive electrode conductive block.

[0051] A sealing ring 68 is fitted onto the connecting portion 611 of the bottom of the negative electrode post 66. One end of the connecting portion 611 is connected to the bottom of the negative electrode post 66, and the other end of the connecting portion passes through the second plastic 62, the substrate, and the first plastic 63 in sequence before being connected to the negative electrode conductive block.

[0052] In the above technical solution, the first plastic 63, the second plastic 62 and the sealing ring 68 play the role of sealing and insulation. Furthermore, the second plastic 62 also plays the role of limiting the bottom of the positive terminal 61 and the bottom of the negative terminal 66, and the first plastic 63 also plays the role of limiting the positive terminal block and the negative terminal block.

[0053] In some alternative embodiments, both the positive electrode conducting block 64 and the negative electrode conducting block 67 have protrusions 69 for welding to the busbar 9. The protrusions 69 on the positive electrode conducting block 64 and the negative electrode conducting block 67 make the overall shape of the positive electrode conducting block 64 or the negative electrode conducting block 67 L-shaped. This L-shaped conducting block provides a larger welding surface area when welded to the busbar 9, and also provides a limiting effect on the busbar 9, thereby making it easier to weld the positive electrode conducting block 64 or the negative electrode conducting block 67 to the busbar 9.

[0054] In this embodiment, both the positive electrode conducting block 64 and the negative electrode conducting block 67 are provided with protrusions 69, and the protrusions 69 of both the positive electrode conducting block 64 and the negative electrode conducting block 67 are provided close to the edge of the substrate 65 to facilitate welding with the busbar 9.

[0055] like Figure 1 The length direction of the dual-cell battery 7 ( Figure 1 (in the L direction) and the width direction ( Figure 1 (middle D direction) extends horizontally, and the height direction of the dual-cell battery 7 ( Figure 1 (In the H direction) it extends vertically.

[0056] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the structure of the upper cover 52 provided in the embodiment of this application. The top of the upper cover 52 has a first through groove 55 along the height direction. The depth of the first through groove 55 is greater than the height of the protrusion 69. The first through groove 55 is used to accommodate the protrusion 69 of another dual-cell battery 7 when multiple dual-cell batteries 7 are overlapped.

[0057] In this embodiment, the top of the upper cover 52 has a first through groove 55 along the height direction, and the depth of the first through groove 55 is greater than the height of the protrusion 69. In a battery pack in which multiple dual-cell batteries 7 are attached and stacked, the first through groove 55 can simultaneously accommodate the busbar 9 and the protrusions 69 of the positive electrode conducting block 64 and the negative electrode conducting block 67 of the adjacent dual-cell batteries 7.

[0058] In some optional embodiments, the upper cover 52 also has a second through groove 56 on each side along the height direction, the second through groove 56 being used for the busbar 9 to pass through. In this embodiment, the upper cover 52 has a second through groove 56 on each side, one of the second through grooves 56 being used for the busbar 9 to pass through and connect to the positive electrode conductive block, and the other second through groove 56 being used for the busbar 9 to pass through and connect to the negative electrode conductive block.

[0059] In some optional embodiments, an injection port and / or an explosion-proof valve (not shown in the figure) are also included, with the first housing 3 and the second housing 4 provided with an injection port and / or an explosion-proof valve.

[0060] In some optional embodiments, the first housing 3 includes a first side housing 31 surrounding the first battery cell 1 along its length, and a first cover plate 32 respectively disposed at a third opening 35 at one end of the first side housing 31 along its length, the other end of the first side housing 31 along its length being the first opening 33; the first cover plate 32 is used to cover the third opening 35, and a liquid injection hole and / or an explosion-proof valve may be provided on the first cover plate 32; in this embodiment, the first side housing 31 may be formed by bending and welding an aluminum plate of a certain thickness to form two openings on the left and right, and no flange is present on any side of the first side housing 31, so it will not occupy more space in any direction of the battery pack.

[0061] Correspondingly, the second housing 4 includes a second side housing 41 surrounding the second cell 2 along its length, and a second cover plate 42 respectively disposed at a fourth opening 36 at one end of the second side housing 41 along its length. The other end of the second side housing 41 along its length is the second opening 34. The second cover plate 42 is used to cover the fourth opening 36, and a liquid injection hole and / or an explosion-proof valve may be provided on the second cover plate 42. In this embodiment, the second side housing 41 may be formed by bending and welding an aluminum plate of a certain thickness to form two openings on the left and right. No flange is present on any side of the second side housing 41, so it will not occupy more space in any direction of the battery pack.

[0062] Please refer to Figure 5 , Figure 5 The flowchart of the preparation method of the dual-cell battery 7 provided in the embodiments of this application includes:

[0063] Step 100: Install the first battery cell 1 into the first side housing 31, and then weld the first cover plate 32 to the first side housing 31; install the second battery cell 2 into the second side housing 41, and then weld the second cover plate 42 to the second side housing 41.

[0064] Step 200: Weld the left and right ends of the lower shell cover 51 to one wide side of the opening of the first side shell 31 and the second side shell 41, respectively.

[0065] Step 300: Weld the positive and negative tabs of the first battery cell 1 to the positive terminal 53 and negative terminal 54 of the lower casing 51, respectively; weld the positive and negative tabs of the second battery cell 2 to the positive terminal 53 and negative terminal 54 of the lower casing 51, respectively.

[0066] Step 400: Weld the upper cover 52, the lower cover 51, the first side cover 31 and the second side cover 41 at the points where they contact each other.

[0067] The present application provides a battery pack including a busbar 9 and a plurality of dual-cell batteries 7 as described above, wherein the busbar 9 is connected to the terminal of the connection component 5 of each dual-cell battery 7.

[0068] This embodiment provides a battery pack including at least one battery group, which includes multiple overlapping dual-cell batteries 7 as described above, with the maximum surfaces of any two adjacent dual-cell batteries 7 in the battery group being in contact with each other.

[0069] In this embodiment, since the protrusions on the positive and negative conductive blocks of the lower cover 51 are adapted to the first through groove 55 of the upper cover 52, when multiple dual-cell batteries 7 are stacked, the first through groove 55 of one of the two adjacent dual-cell batteries 7 can accommodate the protrusion of the other dual-cell battery 7, so that the protrusion does not occupy the space in the length, width and height directions of the battery pack, thereby improving the space utilization of the entire pack.

[0070] In some alternative implementations, please refer to Figure 6 , Figure 6 This is a schematic diagram of a battery pack structure provided in an embodiment of this application. The length direction of the dual-cell batteries 7 in the battery pack is parallel to the width direction of the battery pack (H1 direction in the figure). A busbar 9 is located at the connection component 5 of the dual-cell batteries 7, and the busbar 9 connects to the terminal of each dual-cell battery 7. In this embodiment, the length direction of the dual-cell batteries 7 is arranged along the width direction of the battery pack, and multiple dual-cell batteries 7 form a battery pack along the length direction of the battery pack. The battery pack contains one layer of battery pack along the height direction. Therefore, each dual-cell battery 7 can enhance the structural strength of the battery pack in the width direction. At this time, the width of the battery pack is relatively fixed, approximately a multiple of the length L of the dual-cell batteries 7. However, the length of the battery pack can be flexibly set, determined by the number of dual-cell batteries 7 in the battery pack and the thickness of each dual-cell battery 7.

[0071] The battery pack in this embodiment also has a longitudinal beam 8; battery packs are respectively arranged on both sides of the longitudinal beam 8, and the longitudinal beam 8 is parallel to the two side beams. It should be noted that there can be multiple longitudinal beams 8 here. The longitudinal beam 8 plays the role of strengthening the structural strength of the battery pack in the length direction, and since the dual-cell battery 7 plays the role of strengthening the structural strength of the battery pack in the width direction, the strength of the battery pack in both the length and width directions is guaranteed.

[0072] In some alternative implementations, while the length direction of the dual-cell battery 7 in the battery pack is parallel to the width direction of the battery pack, the battery pack may also be without longitudinal beams 8. In this case, since there are no longitudinal beams 8 inside the battery pack, there is only one battery pack inside the battery pack, that is, all the dual-cell batteries 7 in the battery pack form a battery pack. At this time, the space utilization rate of the battery pack is higher.

[0073] In some alternative implementations, the dual-cell batteries 7 in the battery pack can also be arranged according to the following rules: the length direction of the dual-cell batteries 7 is arranged along the length direction of the battery pack (L1 direction in the figure), multiple dual-cell batteries 7 form a battery pack along the width direction of the battery pack, and the battery pack is a single layer of battery pack along the height direction of the battery pack.

[0074] In this embodiment, the dual-cell batteries 7 are arranged within the battery pack as follows: the length of the dual-cell batteries 7 is arranged along the length of the battery pack, multiple dual-cell batteries 7 form a battery group along the width of the battery pack, and a single layer of battery group is formed along the height of the battery pack. The dual-cell batteries 7 can strengthen the structural strength of the battery pack along its length, and because the dual-cell batteries 7 strengthen the structural strength of the battery pack along its length, the strength of the battery pack in both its length and width directions is guaranteed. When using the arrangement method of this embodiment, the length of the battery pack is relatively fixed, approximately a multiple of the length of the dual-cell batteries 7. However, the width of the battery pack can be flexibly set, determined by the number of dual-cell batteries 7 in the battery group and the thickness between the dual-cell batteries 7.

[0075] In some alternative embodiments, while the length of the dual-cell battery 7 is arranged along the length of the battery pack, the battery pack has a crossbeam along the width of the battery pack, and a battery pack is arranged on each side of the crossbeam.

[0076] It should be clarified that there can be multiple crossbeams here. The crossbeams serve to strengthen the structural strength of the battery pack in the width direction, and since the dual-cell battery 7 also strengthens the structural strength of the battery pack in the length direction, the strength of the battery pack in both the length and width directions is guaranteed.

[0077] In some alternative implementations, the dual-cell battery 7 is arranged along the length of the battery pack, and there is no crossbeam inside the battery pack. In this case, since there is no crossbeam inside the battery pack, there is only one battery group inside the battery pack, that is, all the dual-cell batteries 7 in the battery pack form a battery group. At this time, the space utilization rate of the battery pack is higher.

[0078] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0079] Furthermore, the units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0080] Furthermore, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0081] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0082] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A dual-cell battery, characterized in that, Includes a connection assembly, a first housing, a first battery cell, a second housing, and a second battery cell; The first battery cell is disposed inside the first housing and is surrounded by the first housing; The second battery cell is disposed within the second housing and is surrounded by the second housing; The tab of the first battery cell extends out of the first opening of the first housing, and the tab of the second battery cell extends out of the second opening of the second housing; The connecting component is used to connect the first opening and the second opening, so that the first housing and the second housing are in communication. The connecting assembly includes an upper cover and a lower cover, which are connected to form a cavity with openings on both sides. The cavity is used to accommodate the tabs of the first battery cell and the second battery cell. The lower casing includes a base plate, a terminal post, and a sealing and insulating component; the terminal post includes a terminal post bottom and a connecting portion; the terminal post bottom is connected to the tabs of the first battery cell and the second battery cell; The sealing and insulating component is disposed between the substrate and the bottom of the pole post; One end of the connecting portion is connected to the bottom of the pole post, and the other end of the connecting portion passes through the sealing insulation member and extends out of the substrate; The sealing and insulating component includes a sealing ring, a first plastic component, and a second plastic component; the lower cover also includes a conductive block. The sealing ring is fitted onto the connecting part, one end of the connecting part is connected to the bottom of the pole post, and the other end of the connecting part passes through the second plastic, the substrate, and the first plastic in sequence and is connected to the conductive block; The conductive block has a protrusion for welding to the busbar; The length and width of the dual-cell battery extend horizontally, and the height of the dual-cell battery extends vertically. The top of the upper cover has a first through groove along the height direction, and the depth of the first through groove is greater than the protrusion height of the protrusion; wherein, the first through groove is used to accommodate the protrusion of another dual-cell battery when multiple dual-cell batteries are overlapped.

2. The dual-cell battery as described in claim 1, characterized in that, The bottom of the electrode post includes a positive electrode bottom and a negative electrode bottom. The tabs of the first battery cell and the second battery cell respectively include a positive electrode tab and a negative electrode tab. The bottom of the positive electrode post is connected to the positive electrode tab, and the bottom of the negative electrode post is connected to the negative electrode tab.

3. The dual-cell battery as described in claim 1, characterized in that, The upper shell cover also has a second through groove on each side along the height direction, and the second through groove is used for the passage of the manifold.

4. The dual-cell battery as described in claim 1, characterized in that, It also includes a liquid injection port and / or an explosion-proof valve, wherein the liquid injection port and / or explosion-proof valve are provided on the first housing and the second housing.

5. A battery pack, characterized in that, It includes a busbar and a plurality of dual-cell batteries as described in any one of claims 1-4; the busbar is connected to the conduction block of the connection assembly of each of the dual-cell batteries.

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