A square battery and an electric device

Abstract

The application provides a square battery and an electric device, and belongs to the technical field of battery manufacturing. The square battery comprises a cell unit, a positive cover plate, a negative cover plate and a shell. The cell unit comprises a cell group, the cell group comprises a plurality of cell monomers arranged along the thickness direction of the cell monomers and insulatedly connected, in the height direction of the cell monomers, the positive and negative tabs in each cell monomer are respectively protruded at two ends, and the positive and / or negative tabs on any two adjacent cell monomers in the thickness direction are staggered distributed in the length direction of the cell monomers; in the height direction, the positive cover plate and the negative cover plate are oppositely distributed, the plurality of positive tabs are connected in parallel with the positive pole, and the plurality of negative tabs are connected in parallel with the negative pole; and the two ends of the shell are respectively sealedly connected with the positive cover plate and the negative cover plate. The square battery can effectively solve the problems of inconvenient welding and easy series welding of the tabs in the welding process.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and more specifically, to a square battery and an electrical device. Background Technology

[0002] In existing technologies, high-capacity batteries can effectively reduce the number of components required for PACK and simplify subsequent integration and assembly processes, saving equipment, energy consumption and human resources. Therefore, the development of high-capacity batteries has become a trend. However, due to poor structural design, existing high-capacity batteries have problems such as inconvenient welding of the tabs and easy cross-welding (cross-welding makes the resistance in the tab welding area large and the heat generation too concentrated), which in turn affects the electrical performance of the battery. Utility Model Content

[0003] The purpose of this application is to provide a square battery and an electrical device, which can effectively solve the problems of inconvenient welding and easy cross-welding of the tabs during the welding process, thereby enabling the battery to have superior electrical performance.

[0004] The embodiments of this application are implemented as follows:

[0005] In a first aspect, embodiments of this application provide a square battery, including a cell unit, a positive electrode cover, a negative electrode cover, and a casing. The cell unit includes a cell assembly, which includes multiple individual cells. The multiple individual cells are arranged along the thickness direction of the individual cells and are insulated from each other. In the height direction of the individual cells, the positive electrode tab and the negative electrode tab in each individual cell protrude from both ends. The positive electrode tabs and / or negative electrode tabs on any two adjacent individual cells in the thickness direction are staggered in the length direction of the individual cells. In the height direction, the positive electrode cover and the negative electrode cover are distributed opposite to each other. The multiple positive electrode tabs are located near the positive electrode cover and are connected in parallel and electrically to the positive electrode post on the positive electrode cover. The multiple negative electrode tabs are located near the negative electrode cover and are connected in parallel and electrically to the negative electrode post on the negative electrode cover. The casing surrounds the cell unit, and both ends of the casing are sealed to the positive electrode cover and the negative electrode cover, respectively.

[0006] In the above technical solution, the square battery includes a cell unit, a positive electrode cover plate, a negative electrode cover plate, and a casing. The cell assembly includes multiple individual cells, which are arranged and insulated from each other along the thickness direction. In the height direction of the individual cells, the positive and negative electrode tabs of each individual cell protrude from both ends. In the thickness direction, the positive and / or negative electrode tabs on any two adjacent individual cells are staggered along the length direction of the individual cells. The staggered arrangement of multiple tabs on the same side makes it easier to weld the multiple tabs on the same side to the cover plate. It also helps to reduce the risk of cross-welding of the tabs (reducing the risk of cross-welding helps to reduce the internal resistance of the battery and facilitates heat dissipation in the welding area), so that the battery has better electrical performance.

[0007] In some alternative implementations, a positive conductive plate and a positive insulating support are disposed between the positive electrode cover and the cell assembly. The positive insulating support is close to the cell assembly, and the positive conductive plate is close to the positive electrode cover. The positive electrode tabs of multiple individual cells pass through the positive insulating support and are connected in parallel and electrically to the positive conductive plate. The positive electrode post is electrically connected to the positive conductive plate. Or / and, a negative conductive plate and a negative insulating support are disposed between the negative electrode cover and the cell assembly. The negative insulating support is close to the cell assembly, and the negative conductive plate is close to the negative electrode cover. The negative electrode tabs of multiple individual cells pass through the negative insulating support and are connected in parallel and electrically to the negative conductive plate. The negative electrode post is electrically connected to the negative conductive plate.

[0008] In the above technical solution, a conductive plate and an insulating support of the above form are set between the cover plate and the battery cell assembly to realize the parallel connection of multiple tabs and poles on the same side and the fixation of multiple individual battery cells in the battery cell assembly. It has the advantages of simple structure and reasonable layout.

[0009] In some alternative implementations, the positive electrode insulating support includes multiple detachable and splicable positive electrode support units, each positive electrode support unit has a notch on one side, the multiple positive electrode support units are arranged along the thickness direction, any two adjacent positive electrode support units are spliced ​​together to form a positive electrode through hole, and each positive electrode tab passes through a positive electrode through hole in a one-to-one correspondence.

[0010] In the above technical solution, the positive electrode insulation bracket is set in the above-mentioned detachable splicing form so that the shape and size of the positive electrode through hole are closer to the shape and size of the corresponding electrode tab, thereby helping to improve the fixing stability of the positive electrode insulation bracket to the battery cell.

[0011] In some optional implementations, each positive electrode support unit is a plate-shaped structure with multiple weight-reducing grooves. When any two adjacent positive electrode support units are spliced ​​together, the groove walls of the two adjacent weight-reducing grooves on the corresponding two plate-shaped structures are detachably connected by fasteners.

[0012] In the above technical solution, each positive electrode support unit is a plate-shaped structure with multiple weight-reducing grooves, which helps to reduce the weight of the positive electrode insulation support itself. In addition, two adjacent positive electrode support units are detachably connected by fasteners set on the groove wall of the weight-reducing groove, which has the advantages of a more compact overall structure and a more regular appearance.

[0013] In some alternative implementations, multiple battery cell groups are provided, which are arranged along the length direction and insulated from each other; along the length direction, each positive electrode support unit has multiple notches corresponding to the number of battery cell groups.

[0014] In the above technical solution, multiple battery cell groups are arranged along the length direction and are insulated from each other, which helps to further improve the battery capacity. In addition, along the length direction, each positive electrode support unit has multiple notches corresponding to the number of battery cell groups, which facilitates the simultaneous fixing of multiple battery cell units in multiple battery cell groups.

[0015] In some alternative embodiments, the positive electrode cover includes a positive electrode substrate and a positive electrode insulating plate stacked together, the positive electrode insulating plate being located between the positive electrode substrate and the positive electrode conductive plate, the positive electrode post sequentially penetrating through the positive electrode substrate and the positive electrode insulating plate and being welded to the side of the positive electrode conductive plate opposite to the cell unit, and the positive electrode substrate being welded to the housing; or / and, the negative electrode cover includes a negative electrode substrate and a negative electrode insulating plate stacked together, the negative electrode insulating plate being located between the negative electrode substrate and the negative electrode conductive plate, the negative electrode post sequentially penetrating through the negative electrode substrate and the negative electrode insulating plate and being welded to the side of the negative electrode conductive plate opposite to the cell unit, and the negative electrode substrate being welded to the housing.

[0016] In the above technical solution, the positive electrode cover plate and the negative electrode cover plate are respectively set in the above form to realize the parallel connection of multiple electrodes on the same side with the corresponding electrode post and the sealed connection between the cover plate and the shell, which has the advantages of simple structure and reasonable layout.

[0017] In some alternative implementations, each positive electrode tab is directly welded to a positive conductive plate, and / or each negative electrode tab is directly welded to a negative conductive plate.

[0018] In the above technical solution, the tabs and corresponding conductive plates are directly welded, which helps to shorten the current transmission path and reduce battery heat generation, thereby improving battery performance.

[0019] In some alternative implementations, the positive and negative tabs in each cell are staggered along the length.

[0020] In the above technical solution, the positive and negative electrodes in the same cell are staggered along the length direction, so that the positive and negative electrodes are far apart along the length direction. This can improve the problem of excessive local temperature in the cell during operation, thereby helping to improve the electrical performance of the cell.

[0021] In some alternative implementations, the positive and negative terminals are located on the two sides of the square battery along its length.

[0022] In the above technical solution, the positive and negative terminals of the square battery are respectively set on the two sides of the length direction, which is conducive to the subsequent connection of the battery module and the busbar, thereby improving the assembly efficiency.

[0023] Secondly, embodiments of this application provide an electrical device including a square battery as provided in the first aspect embodiment. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments 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.

[0025] Figure 1 This is a schematic diagram of the structure of a square battery from a frontal view, provided in an embodiment of this application.

[0026] Figure 2 This is a schematic diagram of the structure of a square battery after the casing has been removed, as shown in the front view, according to an embodiment of this application.

[0027] Figure 3 This application provides a schematic diagram of the structure of a square battery after the casing has been removed, viewed from a side perspective.

[0028] Figure 4 A schematic diagram of the structure of a battery cell unit from a top view perspective is provided for an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the structure after the positive electrode tab and the positive electrode insulating support are assembled, as provided in the embodiments of this application;

[0030] Figure 6 A schematic diagram of the structure of a positive electrode insulating support provided in the embodiments of this application from a top view perspective;

[0031] Figure 7 for Figure 6 A magnified view of a section at point A in the middle;

[0032] Figure 8 This is a schematic diagram of the structure of a single battery cell from a frontal view, provided as an embodiment of this application.

[0033] Icons: 10-Square battery; 100-Cell unit; 110-Cell assembly; 111-Single cell; 111a-Positive electrode tab; 111b-Negative electrode tab; 200-Positive cover plate; 210-Positive electrode post; 220-Positive electrode substrate; 230-Positive electrode insulating plate; 300-Negative electrode cover plate; 310-Negative electrode post; 400-Casing; 500-Positive electrode conductive plate; 600-Positive electrode insulating support; 610-Positive electrode support unit; 611-Positive electrode through hole; 612-Weight reduction groove; 613-Fixing component; 700-Negative electrode conductive plate; 800-Negative electrode insulating support; a-Thickness direction; b-Height direction; c-Length direction. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0037] In the description of this application, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] In existing technologies, multiple cells in a large-capacity battery are typically laid out along the thickness direction of the cell. Taking a cell with positive and negative tabs protruding from both ends of the cell as an example, the positions of multiple tabs (positive or negative tabs) on the same side of the cell are usually the same along the length direction of the cell (i.e., multiple tabs are horizontally distributed along the thickness direction). In this distribution, the gap between adjacent tabs is small, and the area of ​​the cover plate that can be used for welding with the tabs is small. This leads to difficulties in welding the tabs and the problem of easy cross-welding (cross-welding makes the resistance in the tab welding area large and the heat generation too concentrated), which in turn affects the electrical performance of the battery.

[0040] Based on this, the inventors discovered that by optimizing the arrangement of multiple battery cells, so that multiple tabs on the same side are staggered along the length, the gap between connected tabs can be increased, thereby effectively solving the problems of inconvenient welding and easy cross-welding of tabs during the welding process, thus giving the battery superior electrical performance.

[0041] The following is a detailed description of a square battery and electrical device provided in this application.

[0042] See Figure 1 , Figure 2 and Figure 3In a first aspect, embodiments of this application provide a square battery 10, including a cell unit 100, a positive electrode cover plate 200, a negative electrode cover plate 300, and a casing 400. The cell unit 100 includes a cell assembly 110, which includes multiple individual cell units 111. These individual cell units 111 are arranged along the thickness direction a and are insulated from each other. In the height direction b of the individual cell unit 111, a positive electrode tab 111a and a negative electrode tab 111b protrude from both ends of each individual cell unit 111. The positive electrode tabs 111a and / or the negative electrode tabs 111b on any two adjacent individual cell units 111 in the thickness direction a are staggered in the length direction c of the individual cell unit 111. Distribution: In the height direction b, the positive electrode cover plate 200 and the negative electrode cover plate 300 are distributed opposite to each other. Multiple positive electrode tabs 111a are located on the side close to the positive electrode cover plate 200 and are connected in parallel and electrically with the positive electrode post 210 on the positive electrode cover plate 200. Multiple negative electrode tabs 111b are located on the side close to the negative electrode cover plate 300 and are connected in parallel and electrically with the negative electrode post 310 on the negative electrode cover plate 300. The housing 400 surrounds the battery cell unit 100, and the two ends of the housing 400 are respectively sealed and connected to the positive electrode cover plate 200 and the negative electrode cover plate 300.

[0043] In this application, the square battery 10 includes a cell unit 100, a positive electrode cover plate 200, a negative electrode cover plate 300, and a casing 400. The cell assembly 110 includes multiple individual cell units 111, which are arranged and insulatedly connected along the thickness direction a of the individual cell units 111. In the height direction b of the individual cell units 111, the positive electrode tab 111a and the negative electrode tab 111b of each individual cell unit 111 protrude from both ends. In the thickness direction a, any two adjacent... The positive electrode tabs 111a and / or negative electrode tabs 111b on the cell 111 are staggered along the length c of the cell 111. The staggered distribution of multiple tabs on the same side makes it easier to weld multiple tabs on the same side to the cover plate. At the same time, it also helps to reduce the risk of cross-welding of the tabs (reducing the risk of cross-welding helps to reduce the internal resistance of the battery and facilitates heat dissipation in the welding area), so that the battery has better electrical performance.

[0044] It should be noted that the number of individual cells 111 in each cell group 110 is not limited, for example, it can be two, three or four, and can be adjusted adaptively according to actual needs. In this embodiment, two individual cells 111 are set in each cell group 110 as an example. To better understand the specific distribution of multiple tabs on the same side, this is combined with Figure 4 Provide supplementary explanations, by Figure 4It can be seen that when two individual cells 111 are set in each cell group 110, the two positive electrode tabs 111a on the two adjacent individual cells 111 are staggered in the length direction c.

[0045] See Figure 1 As an example, along the length direction c, the positive terminal 210 and the negative terminal 310 are located on the two sides of the square battery 10, respectively.

[0046] In this embodiment, the positive terminal 210 and the negative terminal 310 of the square battery 10 are respectively arranged on the two sides of the length direction c, which is beneficial for the subsequent connection of the battery module and the busbar, thereby improving the assembly efficiency.

[0047] In other possible implementations, the positive terminal 210 and the negative terminal 310 may both be located in the middle of the square battery 10 along the length direction c.

[0048] See Figure 2 , Figure 3 and Figure 5 As an example, a positive electrode conductive plate 500 and a positive electrode insulating support 600 are disposed between the positive electrode cover plate 200 and the cell assembly 110. The positive electrode insulating support 600 is close to the cell assembly 110, and the positive electrode conductive plate 500 is close to the positive electrode cover plate 200. The positive electrode tabs 111a of multiple individual cells 111 pass through the positive electrode insulating support 600 and are connected in parallel and electrically with the positive electrode conductive plate 500. The positive electrode post 210 is electrically connected to the positive electrode conductive plate 500. A negative electrode conductive plate 700 and a negative electrode insulating bracket 800 are provided between the negative electrode cover plate 300 and the cell assembly 110. The negative electrode insulating bracket 800 is close to the cell assembly 110, and the negative electrode conductive plate 700 is close to the negative electrode cover plate 300. The negative electrode tabs 111b of multiple cell units 111 pass through the negative electrode insulating bracket 800 and are connected in parallel and electrically with the negative electrode conductive plate 700. The negative electrode post 310 is electrically connected to the negative electrode conductive plate 700.

[0049] In this embodiment, a conductive plate and an insulating support of the above form are provided between the cover plate and the battery cell assembly 110 to realize the parallel connection of multiple tabs and poles on the same side and the fixation of multiple battery cell units 111 in the battery cell assembly 110. This has the advantages of simple structure and reasonable layout.

[0050] As an example, the positive electrode insulating support 600 is made of PP.

[0051] It should be noted that the size and capacity of the battery cell 111 are not limited. For example, the length of the battery cell 111 is 50-250mm, the width is 50-250mm, the thickness is 20-70mm, and the capacity is 100-500Ah. The specific dimensions can be adjusted according to actual needs.

[0052] See Figure 5 and Figure 6 As an example, the positive electrode insulating support 600 includes multiple detachable and splicable positive electrode support units 610. Each positive electrode support unit 610 has a notch on one side. The multiple positive electrode support units 610 are arranged along the thickness direction a. Any two adjacent positive electrode support units 610 are spliced ​​together to form a positive electrode through hole 611. Each positive electrode tab 111a passes through a positive electrode through hole 611.

[0053] In this embodiment, the positive electrode insulating bracket 600 is configured in the above-mentioned detachable splicing form so that the shape and size of the positive electrode through hole 611 are closer to the shape and size of the corresponding electrode tab, thereby helping to improve the fixing stability of the positive electrode insulating bracket 600 to the battery cell 111.

[0054] See Figure 2 As an example, multiple battery cell groups 110 are provided, and the multiple battery cell groups 110 are arranged along the length direction c and are insulated from each other; along the length direction c, each positive electrode support unit 610 has multiple notches corresponding to the number of battery cell groups 110.

[0055] In this embodiment, multiple battery cell groups 110 are provided, and the multiple battery cell groups 110 are arranged along the length direction c and are insulatedly connected, which helps to further improve the battery capacity. In addition, along the length direction c, each positive electrode support unit 610 has multiple notches corresponding to the number of battery cell groups 110, which facilitates the simultaneous fixing of multiple battery cell units 111 in multiple battery cell groups 110.

[0056] It should be noted that there is no limit to the number of battery cells 110; for example, there can be two, three, or four cells, which can be adjusted according to actual needs.

[0057] See Figure 6 and Figure 7 As an example, each positive electrode support unit 610 is a plate-shaped structure with multiple weight-reducing grooves 612. When any two adjacent positive electrode support units 610 are spliced ​​together, the groove walls of the two adjacent weight-reducing grooves 612 on the corresponding two plate-shaped structures are detachably connected by fasteners 613.

[0058] In this embodiment, each positive electrode support unit 610 is a plate-shaped structure with multiple weight-reducing grooves 612, which helps to reduce the weight of the positive electrode insulation support 600 itself. In addition, two adjacent positive electrode support units 610 can be detachably connected by a fixing member 613 set on the groove wall of the weight-reducing groove 612, which has the advantages of a more compact overall structure and a more regular appearance.

[0059] It should be noted that the location and number of fasteners 613 are not limited. For example, some of the walls of the weight reduction grooves 612 can be detachably connected by fasteners 613, or all the walls of the weight reduction grooves 612 can be detachably connected by fasteners 613. The specific arrangement can be adjusted according to actual needs.

[0060] It should be noted that the form of the fastener 613 is not limited. For example, it can be a pin or a bolt. The specific setting can be set according to the conventional selection in this field.

[0061] It should be noted that the form of the negative electrode insulating bracket 800 can be set with reference to the positive electrode insulating bracket 600.

[0062] As an example, the negative electrode insulating bracket 800 is made of PP.

[0063] As an example, the negative electrode insulating bracket 800 includes multiple detachable and splicable negative electrode bracket units. Each negative electrode bracket unit has a notch on one side. The multiple negative electrode bracket units are arranged along the thickness direction a. Any two adjacent negative electrode bracket units are spliced ​​together to form a negative electrode through hole. Each negative electrode tab 111b passes through a negative electrode through hole.

[0064] As an example, multiple battery cell groups 110 are provided, and the multiple battery cell groups 110 are arranged along the length direction c and are insulated from each other; along the length direction c, each negative electrode bracket has multiple notches corresponding to the number of battery cell groups 110.

[0065] As an example, each negative electrode support unit is a plate-shaped structure with multiple weight-reducing grooves 612. When any two adjacent negative electrode support units are spliced ​​together, the groove walls of the two adjacent weight-reducing grooves 612 on the corresponding two plate-shaped structures are detachably connected by fasteners 613.

[0066] See Figure 3 As an example, the positive electrode cover 200 includes a positive electrode substrate 220 and a positive electrode insulating plate 230 stacked together. The positive electrode insulating plate 230 is located between the positive electrode substrate 220 and the positive electrode conductive plate 500. The positive electrode post 210 passes through the positive electrode substrate 220 and the positive electrode insulating plate 230 in sequence and is welded to the side of the positive electrode conductive plate 500 away from the cell unit 100. The positive electrode substrate 220 is welded to the housing 400. Or / and, the negative electrode cover 300 includes a negative electrode substrate and a negative electrode insulating plate stacked together. The negative electrode insulating plate is located between the negative electrode substrate and the negative electrode conductive plate 700. The negative electrode post 310 passes through the negative electrode substrate and the negative electrode insulating plate in sequence and is welded to the side of the negative electrode conductive plate 700 away from the cell unit 100. The negative electrode substrate is welded to the housing 400.

[0067] In this embodiment, the positive electrode cover plate 200 and the negative electrode cover plate 300 are respectively arranged in the manner described above, so as to realize the parallel connection of multiple tabs and corresponding poles on the same side and the sealed connection between the cover plate and the housing 400, which has the advantages of simple structure and reasonable layout.

[0068] As an example, each positive electrode tab 111a is directly welded to the positive conductive plate 500, and / or each negative electrode tab 111b is directly welded to the negative conductive plate 700.

[0069] In this embodiment, the tabs and corresponding conductive plates are directly welded together, which helps to shorten the current transmission path and reduce battery heat generation, thereby improving battery performance.

[0070] It should be noted that each battery cell 111 is typically composed of multiple positive electrode sheets, multiple separators, and multiple negative electrode sheets through winding or stacking. (The positive electrode sheet includes a positive current collector and an active material layer, with the active material layer coated on the surface of the positive current collector. The uncoated positive current collector forms the positive electrode tab 111a. The positive electrode sheet is prepared through baking, rolling, slitting, and die-cutting processes.) Similarly, the negative electrode sheet includes a negative current collector and an active material layer, with the active material layer coated on the surface of the negative current collector. On the surface of the current collector, the negative current collector without the coating of negative electrode active material constitutes the negative electrode tab 111b. After baking, rolling, slitting, die cutting and other processes, the negative electrode sheet is prepared. In order to facilitate the welding of multiple positive electrode tabs 111a and multiple negative electrode tabs 111b in the same cell 111 to the corresponding cover plate and reduce the internal resistance at the welding point, multiple positive electrode tabs 111a and multiple negative electrode tabs 111b in the same cell 111 can be stacked and bent before being connected to the cover plate.

[0071] In other possible implementations, multiple positive electrode tabs 111a can also be connected in parallel with the positive electrode post 210 via positive electrode adapter pieces.

[0072] See Figure 8 As an example, in the length direction c, the positive electrode tabs 111a and negative electrode tabs 111b in each cell 111 are staggered.

[0073] In this embodiment, the positive electrode tab 111a and the negative electrode tab 111b in the same cell 111 are staggered along the length direction c, so that the positive electrode tab 111a and the negative electrode tab 111b are far apart along the length direction c. This can improve the problem of excessive local temperature in the cell 111 during operation, thereby helping to improve the electrical performance of the cell 111.

[0074] It should be noted that for any structural or functional components in the square battery 10 that are not specifically described, they can be configured in accordance with conventional choices in the art.

[0075] As an example, each battery cell 111 includes a battery cell body and a first insulating protective layer covering the battery cell body, with a positive electrode tab 111a and a negative electrode tab 111b protruding from both ends of the battery cell body.

[0076] As an example, the square battery 10 also includes a first insulating protective layer that covers the outside of the cell unit 100, and in the height direction b, the two ends of the first insulating protective layer are respectively bonded to the positive electrode insulating support 600 and the negative electrode insulating support 800.

[0077] In this embodiment, a first insulating protective layer is provided outside the cell body and a second insulating protective layer is provided outside the cell unit 100, which helps to reduce the risk of short circuits inside the battery.

[0078] As an example, the first insulating protective layer is made of PP and has a thickness of 0.05 to 0.2 mm, such as, but not limited to, any one of 0.05 mm, 0.1 mm, 0.15 mm and 0.2 mm or any range between two of them.

[0079] As an example, the material of the second insulating protective layer is PET, PC, PP or PI.

[0080] As an example, the positive electrode cover plate 200 is also provided with a liquid injection hole, and the negative electrode cover plate 300 is also provided with an explosion-proof valve.

[0081] Secondly, embodiments of this application provide an electrical device including a square battery as provided in the first aspect embodiment.

[0082] It should be noted that there are no restrictions on the type of electrical equipment; the settings can be configured according to the conventional methods used in this field.

[0083] The above description is merely a preferred embodiment of this application and is not intended to limit 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 protection scope of this application.

Claims

1. A square battery, characterized in that, include: A battery cell unit, comprising a battery cell group, the battery cell group comprising multiple individual battery cells, the multiple individual battery cells being arranged and insulatedly connected along the thickness direction of the individual battery cells, in the height direction of the individual battery cells, a positive electrode tab and a negative electrode tab in each individual battery cell are respectively protruding from both ends, and the positive electrode tabs and / or the negative electrode tabs on any two adjacent individual battery cells in the thickness direction are staggered in the length direction of the individual battery cells; The positive electrode cover plate and the negative electrode cover plate are distributed opposite to each other in the height direction. A plurality of positive electrode tabs are located near the positive electrode cover plate and are connected in parallel and electrically to the positive electrode post on the positive electrode cover plate. A plurality of negative electrode tabs are located near the negative electrode cover plate and are connected in parallel and electrically to the negative electrode post on the negative electrode cover plate. The housing surrounds the battery cell unit, and its two ends are respectively sealed to the positive electrode cover plate and the negative electrode cover plate.

2. The square battery according to claim 1, characterized in that, A positive electrode conductive plate and a positive electrode insulating support are provided between the positive electrode cover plate and the cell assembly. The positive electrode insulating support is close to the cell assembly, and the positive electrode conductive plate is close to the positive electrode cover plate. The positive electrode tabs of multiple individual cells pass through the positive electrode insulating support and are connected in parallel and electrically with the positive electrode conductive plate. The positive electrode post is electrically connected to the positive electrode conductive plate. or / and, A negative electrode conductive plate and a negative electrode insulating bracket are provided between the negative electrode cover plate and the battery cell assembly. The negative electrode insulating bracket is close to the battery cell assembly, and the negative electrode conductive plate is close to the negative electrode cover plate. The negative electrode tabs of multiple battery cell units pass through the negative electrode insulating bracket and are connected in parallel and electrically to the negative electrode conductive plate. The negative electrode post is electrically connected to the negative electrode conductive plate.

3. The square battery according to claim 2, characterized in that, The positive electrode insulating support includes multiple detachable and splicable positive electrode support units. Each positive electrode support unit has a notch on one side. The multiple positive electrode support units are arranged along the thickness direction. Any two adjacent positive electrode support units are spliced ​​together to form a positive electrode through hole. Each positive electrode tab passes through one positive electrode through hole.

4. The square battery according to claim 3, characterized in that, Each of the positive electrode support units is a plate-shaped structure with multiple weight-reducing grooves. When any two adjacent positive electrode support units are spliced ​​together, the groove walls of the two adjacent weight-reducing grooves on the corresponding two plate-shaped structures are detachably connected by fasteners.

5. The square battery according to claim 3, characterized in that, The battery cell assembly is provided in multiple ways, and the multiple battery cell assemblies are arranged along the length direction and are insulated from each other; along the length direction, each positive electrode support unit has multiple notches corresponding to the number of battery cell assemblies.

6. The square battery according to claim 2, characterized in that, The positive electrode cover plate includes a positive electrode substrate and a positive electrode insulating plate stacked together. The positive electrode insulating plate is located between the positive electrode substrate and the positive electrode conductive plate. The positive electrode post passes through the positive electrode substrate and the positive electrode insulating plate in sequence and is welded to the side of the positive electrode conductive plate away from the cell unit. The positive electrode substrate is welded to the shell. or / and, The negative electrode cover plate includes a negative electrode substrate and a negative electrode insulating plate stacked together. The negative electrode insulating plate is located between the negative electrode substrate and the negative electrode conductive plate. The negative electrode post passes through the negative electrode substrate and the negative electrode insulating plate in sequence and is welded to the side of the negative electrode conductive plate opposite to the cell unit. The negative electrode substrate is welded to the housing.

7. The square battery according to claim 6, characterized in that, Each of the positive electrode tabs is directly welded to the positive conductive plate, and / or each of the negative electrode tabs is directly welded to the negative conductive plate.

8. The square battery according to any one of claims 1 to 7, characterized in that, Along the length direction, the positive and negative electrode tabs in each of the battery cells are staggered.

9. The square battery according to any one of claims 1 to 7, characterized in that, Along the length direction, the positive terminal and the negative terminal are located at the two sides of the square battery, respectively.

10. An electrical appliance, characterized in that, Includes the square battery as described in any one of claims 1 to 9.

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