Electricity storage device and electric equipment

Abstract

The embodiment of the utility model provides an electricity storage device and electric equipment. The electricity storage device comprises a plurality of battery cells, a tab bracket and a plurality of electric connection bars, the plurality of battery cells are stacked along a first direction; the tab bracket comprises a first tab bracket part and a second tab bracket part which are arranged along a second direction, and the second direction is perpendicular to the first direction. And the two tabs of each battery cell respectively extend to the first tab bracket part and the second tab bracket part. The plurality of electric connection rows and the tab bracket are of an integrated structure, and the plurality of electric connection rows comprise a first electric connection row, the first electric connection row extends from the first tab bracket part to the second tab bracket part, and the first electric connection row is used for electrically connecting the tab of at least one battery cell with the tab of at least another battery cell. According to the technical scheme of the embodiment of the invention, in the second direction, the first electric connection bar of the tab bracket basically extends from one side of the tab bracket to the other side of the tab bracket, so that the supporting capacity and the supporting stability of the tab bracket to the battery cell can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an energy storage device and an electrical appliance. Background Technology

[0002] Energy storage devices, such as power batteries, are increasingly being used as a clean energy source in electrical equipment such as drones, automobiles, and power tools.

[0003] To meet the power needs of different electrical devices, a certain number of battery cells are usually connected in series and / or in parallel to form an energy storage device with a certain capacity.

[0004] In related technologies, when the number of battery cells is large, energy storage devices suffer from low structural strength and poor stability, which in turn poses safety risks to electrical equipment. Utility Model Content

[0005] In view of this, embodiments of this application provide an energy storage device and an electrical device, aiming to solve the problems of low structural strength and poor stability of the energy storage device when the number of battery cells is large.

[0006] In a first aspect, embodiments of this application provide an energy storage device. The energy storage device includes a plurality of battery cells, a tab support, and a plurality of electrical connection bars. The plurality of battery cells are stacked along a first direction. The tab support includes a first tab support portion and a second tab support portion arranged along a second direction perpendicular to the first direction. Two tabs of each battery cell extend to the first tab support portion and the second tab support portion, respectively. The plurality of electrical connection bars are integrally formed with the tab support and include a first electrical connection bar extending from the first tab support portion to the second tab support portion, electrically connecting the tabs of at least one battery cell to the tabs of at least another battery cell.

[0007] In conjunction with the first aspect described above, in one possible implementation, the energy storage device further includes a separator. The separator and a plurality of battery cells are stacked along a first direction and located between adjacent battery cells, and are connected to a tab support.

[0008] In conjunction with the first aspect described above, in one possible implementation, on a projection plane perpendicular to the third direction, the orthographic projection of the partition partially overlaps with the orthographic projection of the first electrical connection bar. The third direction is perpendicular to both the first and second directions.

[0009] In conjunction with the first aspect described above, in one possible implementation, the first electrical connection bar includes a first connection portion and a second connection portion. The first connection portion is located on a first electrode tab support portion, and the second connection portion is located on a second electrode tab support portion. In a first direction, the first connection portion is located on a first side of the partition, and the second connection portion is located on a second side of the partition. The first connection portion is connected to at least one battery cell, and the second connection portion is connected to at least another battery cell. In the first direction, at least one battery cell is located on the first side of the partition, and at least another battery cell is located on the second side of the partition.

[0010] In conjunction with the first aspect described above, in one possible implementation, in the first direction, the distance between the partition and one side of the plurality of battery cells is D1, and the distance between the two sides of the plurality of battery cells is D2. D1 and D2 satisfy: 1 / 3 ≤ D1 / D2 ≤ 2 / 3.

[0011] In conjunction with the first aspect above, in one possible implementation, along the second direction, the two ends of the separator are located outside the two ends of any battery cell; and / or, along the second direction, the distance D between any end of the separator and the corresponding end of the battery cell satisfies: 1mm≤D≤20mm.

[0012] In conjunction with the first aspect described above, in one possible implementation, the first electrical connector further includes a first extension and a second extension. The first extension is formed by the first connector extending partially along a second direction toward the side of the second connector, wherein the length of the second connector is greater than the length of the first extension and a first step is formed therein; and / or, the second extension is formed by the second connector extending partially along a second direction toward the side of the first connector, wherein the length of the first connector is greater than the length of the second extension and a second step is formed therein.

[0013] In conjunction with the first aspect described above, in one possible implementation, the tab support includes a first protrusion and a second protrusion. Along a third direction, the tops of the first and second protrusions are higher than the top of the first electrical connector, and are respectively disposed opposite to the first and second extensions, and / or the surfaces of the first and / or second protrusions are formed with grooves.

[0014] In conjunction with the first aspect described above, in one possible implementation, along the second direction, the end of the first connecting portion near the partition has a chamfered corner; and / or the end of the second connecting portion near the partition has a chamfered corner.

[0015] In conjunction with the first aspect described above, in one possible implementation, the plurality of electrical connection blocks further include a main positive connection block, a main negative connection block, a second electrical connection block, and a third electrical connection block. Along a first direction, the second electrical connection block and the main positive connection block are located on one side of the first electrical connection block, and the third electrical connection block and the main negative connection block are located on the other side of the first electrical connection block. Along a second direction, the second electrical connection block and the main positive connection block are arranged opposite to each other, and the third electrical connection block and the main negative connection block are arranged opposite to each other, with the main positive connection block and the main negative connection block located in the corner region of the edge of the tab support.

[0016] In conjunction with the first aspect above, in one possible implementation, the main positive and main negative electrical connection busbars are copper busbars, and the first, second, and third electrical connection busbars are aluminum busbars; and / or, the thickness of the main positive and main negative electrical connection busbars is T1, and the thickness of the first, second, and third electrical connection busbars is T2. T1 and T2 satisfy: 0.4 ≤ T1 / T2 ≤ 0.6.

[0017] In conjunction with the first aspect above, in one possible implementation, in the first direction, the minimum distance between the total positive electrical connection bar and the first electrical connection bar is greater than the minimum distance between the second electrical connection bar and the first electrical connection bar, and is greater than the minimum distance between the third electrical connection bar and the first electrical connection bar; and / or, the minimum distance between the total negative electrical connection bar and the first electrical connection bar is greater than the minimum distance between the second electrical connection bar and the first electrical connection bar, and is greater than the minimum distance between the third electrical connection bar and the first electrical connection bar.

[0018] In conjunction with the first aspect described above, in one possible implementation, on a projection plane perpendicular to the third direction, the orthographic projection of the tab support has an area S1, and the plurality of electrical connection bars have an area S2. S1 and S2 satisfy: 60% ≤ S1 / S2 ≤ 90%. The third direction is perpendicular to both the first and second directions.

[0019] In conjunction with the first aspect described above, in one possible embodiment, the energy storage device further includes a fastener and a housing portion. The tab support has a through hole, through which the fastener connects the tab support to the housing portion. The through hole avoids the corner area of ​​the edge of the tab support. And / or, the energy storage device further includes a housing portion having a receiving cavity, within which a plurality of battery cells and the tab support are located. The corner of the tab support has a gap A with the inner wall surface of the receiving cavity. A satisfies: 1mm ≤ A ≤ 25mm.

[0020] Secondly, embodiments of this application also provide an electrical device that includes the energy storage device of any of the above embodiments.

[0021] In related technologies, multiple electrical connectors are located on both sides of the tab support along its width. Therefore, the sides of the tab support are stronger, while the middle is weaker. The tabs of the battery cell are supported by the electrical connectors on the tab support. When the tabs are installed onto the electrical connectors on both sides of the tab support, some installation error may occur, causing tension on the tab support. For example, if battery cells are stacked sequentially along the length of the tab support, with the two tabs of one cell supporting adjacent electrical connectors on both sides of the tab support, unavoidable installation errors can cause the tab support to warp and twist due to the tension on the tabs.

[0022] Especially when there are many battery cells, external forces and / or installation errors of the tabs may cause cracks or breakage in the middle of the tab bracket. Therefore, when there are a large number of battery cells in a battery module, the tab bracket is required to have high structural strength to ensure the structural strength and stability of the battery module, and thus the structural strength and stability of the battery.

[0023] According to the technical solution of the embodiments of this application, in the second direction (i.e., the width direction of the tab bracket), the first electrical connection bar of the tab bracket extends substantially from one side of the tab bracket to the other side. This improves the structural strength of the middle part of the tab bracket and the overall structural strength of the tab bracket, thereby enhancing the tab bracket's support capacity and stability for the battery cell, and ultimately improving the overall structural strength and stability of the battery module to ensure the structural strength and stability of the battery. 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 described below. It should be understood that the drawings only show some embodiments of this application and should not be considered as a limitation of the scope. It should also be understood that the same or similar reference numerals are used in the drawings to represent the same or similar elements. Furthermore, it should be understood that the drawings are merely schematic, and the dimensions and scale of the elements in the drawings are not necessarily precise.

[0025] Figure 1 This is a schematic diagram of a plurality of electrical connection bars and fasteners according to one embodiment of the present application.

[0026] Figure 2 This is a partial structural schematic diagram of an energy storage device according to an embodiment of this application.

[0027] Figure 3 This is a schematic diagram of a battery cell structure according to an embodiment of this application.

[0028] Figure 4 This is a top view schematic diagram of an energy storage device with the upper casing removed according to an embodiment of this application.

[0029] Figure 5 This is a schematic diagram of the structure of an energy storage device according to an embodiment of this application.

[0030] Figure label:

[0031] 100. Energy storage devices;

[0032] 11. Battery cell; 111. First tab; 112. Second tab;

[0033] 12. Electrode support; 121. First electrode support portion; 122. Second electrode support portion; 123. First protrusion; 124. Second protrusion;

[0034] 13. Electrical connector; 131. First electrical connector; 1311. First connection part; 1312. Second connection part; 1313. First extension part; 1314. Second extension part; 1315. First step; 1316. Second step; 1317. Chamfer; 132. Second electrical connector; 133. Third electrical connector; 134. Main positive electrical connector; 135. Main negative electrical connector;

[0035] 14. Partition;

[0036] 20. Housing part; 21. Receiving cavity; 22. Upper housing; 23. Lower housing; 30. Fastener. Detailed Implementation

[0037] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application. This application can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0038] Energy storage devices, such as start-stop battery packs, battery modules, power battery packs, and low-voltage battery packs, can be used in automobiles, home energy storage, drones, and electric bicycles.

[0039] An energy storage device is formed by connecting a certain number of battery cells in series and / or parallel. It can provide a certain voltage and capacity to meet the power needs of different applications. For example, an energy storage device can be formed by connecting multiple battery cells in series; or by connecting multiple battery cells in parallel; or by connecting several groups of battery cells in series, with each group including multiple battery cells connected in parallel; or by connecting several groups of battery cells in parallel, with each group including multiple battery cells connected in series.

[0040] An energy storage device typically consists of multiple battery cells, electrode holders, and electrical connectors mounted on the electrode holders, which support, secure, and protect the battery cells. Therefore, energy storage devices require a certain level of structural strength and stability. The number of battery cells constituting the energy storage device can be determined based on the power requirements of different electrical devices.

[0041] In related technologies, when the number of battery cells constituting an energy storage device is large, the energy storage device suffers from low structural strength and poor stability, which in turn poses safety risks to the electrical equipment.

[0042] For example, in the width direction of the tab support of the energy storage device, multiple electrical connection bars that are electrically connected to the tabs of the battery cell are located on both sides of the tab support. Therefore, the strength of the tab support is higher on both sides and weaker in the middle.

[0043] The tabs of a battery cell are typically supported by electrical connectors mounted on a tab holder. When the tabs are installed onto the electrical connectors on both sides of the tab holder, some installation error can occur, causing tension on the tab holder. For example, if battery cells are stacked sequentially along the length of the tab holder, with the two tabs of one cell supporting adjacent electrical connectors on either side of the holder, this unavoidable installation error can cause the tab holder to warp and twist due to the tension from the tabs. Especially when there are many battery cells, the force exerted by external forces and / or installation errors on the tabs may cause cracks or breakage in the middle of the tab holder.

[0044] To address the aforementioned problems in related technologies, this application provides an energy storage device and an electrical appliance having the same. The following is in conjunction with... Figures 1 to 5 The energy storage device provided in the embodiments of this application will be described.

[0045] It should be understood that there are many ways to implement this application, and it should not be construed as being limited to the embodiments described herein. The embodiments described herein are only for a more thorough and clear understanding of this disclosure.

[0046] Exemplary energy storage device

[0047] For ease of description, the following definitions define a first direction (X direction in the diagram), a second direction (Y direction in the diagram), and a third direction (Z direction in the diagram). The second direction is perpendicular to the first direction, and the third direction is perpendicular to both the first and second directions. The first and second directions lie on the same plane. The first direction represents the arrangement direction of multiple battery cells.

[0048] refer to Figure 2 The energy storage device 100 may include a plurality of battery cells 11, a tab support 12, and a plurality of electrical connection bars 13. The plurality of battery cells 11 may be stacked along a first direction X, for example, the plurality of battery cells 11 may be stacked along the length direction of the tab support 12. (See reference...) Figure 3 Each battery cell 11 may include a first tab 111 and a second tab 112, with the first tab 111 and the second tab 112 having opposite polarities. For example, the first tab 111 may be the positive tab and the second tab 112 may be the negative tab. Of course, the first tab 111 may be the negative tab and the second tab 112 may be the positive tab.

[0049] It should be noted that this application does not limit the stacking direction of the battery cells along the tab support 12. Those skilled in the art can adjust it according to the needs of specific application scenarios. For example, multiple battery cells 11 can be stacked along the width direction of the tab support 12.

[0050] The tab support 12 may include a first tab support portion 121 and a second tab support portion 122 arranged along a second direction Y (e.g., the width direction of the tab support 12), the second direction Y being perpendicular to the first direction X, and the first direction X and the second direction Y being located on the orthographic projection plane of the tab support 12 along its thickness direction.

[0051] It should be noted that this application does not limit the arrangement direction of the first electrode holder 121 and the second electrode holder 122. For example, the first electrode holder 111 and the second electrode holder 112 can also be arranged along the length direction of the electrode holder 12. In this case, the first direction X is correspondingly the width direction of the electrode holder 12.

[0052] Each battery cell 11 has two tabs extending to a first tab support portion 121 and a second tab support portion 122, respectively. Exemplarily, one tab of each battery cell 11 may be supported on the first tab support portion 121, and the other tab may be supported on the second tab support portion 122. It should be noted that either the first tab 111 of the battery cell 11 may be supported on the first tab support portion 121, or the second tab 112 of the battery cell 11 may be supported on the first tab support portion 121; this application does not impose any limitation on this.

[0053] Multiple electrical connectors 13 and the tab support 12 are integrated into one structure, for example, multiple electrical connectors 13 and the tab support 12 are formed into one structure by injection molding. The injection molding process here can be insert injection molding. The tabs of the battery cell 11 can be electrically connected to the corresponding electrical connectors 13.

[0054] The plurality of electrical connection bars 13 include a first electrical connection bar 131. The first electrical connection bar 131 can extend from a first tab support portion 121 to a second tab support portion 122, that is, the first electrical connection bar 131 can be located simultaneously in the first tab support portion 121 and the second support portion. Exemplarily, along the width direction of the tab support 12, the first electrical connection bar 131 extends from one side of the tab support 12 to the other side. The first electrical connection bar 131 can electrically connect the tab of at least one battery cell 11 to the tab of at least another battery cell 11.

[0055] It should be noted that this application does not limit the extension direction of the first electrical connector 131 along the tab support 12. For example, it can also extend from one side of the tab support 12 to the other along the length direction of the tab support 12. Furthermore, the extent to which the first electrical connector 131 extends on the first tab 111 support and the second tab 112 support is not limited. It can extend substantially to the edges of the first tab support portion 121 and the second tab support portion 122, for example, along the width or length direction of the tab support 12, to a position 0.5 mm to 60 mm (e.g., 0.8 mm, 1 mm, 3 mm, 5 mm, 10 mm, 20 mm, 30 mm, 40 mm, or 50 mm, etc.) from their edges.

[0056] According to the technical solution of the embodiments of this application, in the second direction Y (i.e., the width direction of the tab support 12), the first electrical connection bar 131 extends substantially from one side of the tab support 12 to the other side. This improves the structural strength of the middle part of the tab support 12 and the overall structural strength of the tab support 12, thereby enhancing the support capacity and stability of the tab support 12 for the battery cell 11, and thus improving the overall structural strength and stability of the energy storage device 100 to ensure the structural strength and stability of the battery. Therefore, when the number of battery cells 11 constituting the energy storage device 100 is large, the tab support 12 can have higher structural strength to ensure the structural strength and stability of the energy storage device 100, and thus ensure the structural strength and stability of the battery.

[0057] Continue to refer to Figure 2 In some embodiments, the energy storage device 100 may further include a partition 14. The partition 14 and a plurality of battery cells 11 are stacked along a first direction X, for example, along the length of the tab support 12. The partition 14 may be located between two adjacent battery cells 11 and connected to the tab support 12. Here, the two adjacent battery cells 11 may be any two adjacent battery cells 11 among the plurality of battery cells 11.

[0058] As mentioned above, when there are many battery cells 11 forming the energy storage device 100, due to certain installation errors between the tabs of the battery cells 11 and the tab support 12, the tabs may pull on the tab support 12. At the same time, different battery cells 11 may pull on the tab support 12 in different directions, causing the tab support 12 to twist and warp, and even causing the energy storage device 100 to twist.

[0059] A separator 14 connected to the tab support 12 is provided between two adjacent cells 11. The separator 14 and the tab support 12 form a stable T-shaped support structure with two mutually perpendicular support surfaces. The separator 14, together with the tab support 12, supports the cells 11 located on both sides of the separator 14, reducing and preventing the accumulation of tab installation errors. Furthermore, the cells 11 located on both sides of the separator 14 can support each other through the separator 14, thereby improving the torsional resistance of the energy storage device 100. When the energy storage device 100 is installed in the housing portion 20, the separator 14, together with the two opposite sidewalls of the housing portion 20, supports the cells 11 located between them, thereby improving the overall structural strength and stability of the battery. In addition, the separator 14 can further improve the structural strength of the middle part of the tab support 12.

[0060] Continue to refer to Figure 2 On a projection plane perpendicular to a third direction Z (e.g., the thickness direction of the tab holder 12), the orthographic projection of the partition 14 can partially overlap with the orthographic projection of the first electrical connection bar 131. The third direction Z is perpendicular to both the first direction X and the second direction Y.

[0061] Thus, the partition 14 and the first electrical connection bar 131 at least partially intersect, forming a T-shaped stable support structure together with the first electrical connection bar 131, with two mutually perpendicular support surfaces, which better improves the overall structural strength and stability of the energy storage device 100.

[0062] The following is for reference. Figure 1 The structure of the first electrical connection bar 131 will be described in detail below. The first electrical connection bar 131 may include a first connecting portion 1311 and a second connecting portion 1312. The first connecting portion 1311 may be located on the first electrode bracket portion 121, and the second connecting portion 1312 may be located on the second electrode bracket portion 122. In the first direction X, the first connecting portion 1311 protrudes beyond the first side of the partition 14, and the second connecting portion 1312 protrudes beyond the second side of the partition 14.

[0063] Thus, the first connecting part 1311 and the second connecting part 1312 are located on both sides of the partition 14, that is, the partition 14 is basically located in the middle of the first electrical connection bar 131, which can improve the overall structural strength and stability of the energy storage device 100 while making the structural strength of the energy storage device 100 relatively uniform.

[0064] The first connecting portion 1311 can be connected to at least one battery cell 11, and the second connecting portion 1312 can be connected to at least another battery cell 11. In the first direction X, at least one battery cell 11 is located on the first side of the separator 14, and at least another battery cell 11 is located on the second side of the separator 14. For example, refer to... Figure 1The first connecting part 1311 is connected to two battery cells 11 located on the first side of the partition 14, and the second connecting part 1312 is connected to the other two battery cells 11 located on the second side of the partition 14.

[0065] In this way, the cells 11 located on both sides of the partition 14 can constrain and support each other, which can offset the installation error to a certain extent and reduce and avoid the torsion of the energy storage device 100.

[0066] Return to reference Figure 2 In the first direction X, the separator 14 is substantially located at the center of the entire plurality of battery cells 11. Here, "substantially located at the center of the entire plurality of battery cells 11" in the first direction X means that, along the length of the battery cell 11, the separator 14 is located at a position ±15% of the center of the entire plurality of battery cells 11. Here, "center of the entire plurality of battery cells 11" can be understood as follows: in the first direction X, the distance between the separator 14 and one side of the entire plurality of battery cells 11 is D1, and the distance between the two sides of the entire plurality of battery cells 11 is D2. D1 and D2 satisfy: 1 / 3 ≤ D1 / D2 ≤ 2 / 3. For example, in the first direction X, the ratio of the distance from the edge of the exhaust port of the energy storage device 100 to one side edge or the other side edge of the energy storage device 100 to the length between the two sides of the energy storage device 100 satisfies 0.3 to 0.7. For example, along the stacking direction of the battery cells, the ratio of the distance from the edge of the vent of the energy storage device 100 to one side edge or the distance from the other side edge of the energy storage device 100 to the length between the two sides of the energy storage device 100 satisfies 0.3 to 0.7.

[0067] Thus, the partition 14 is basically located in the middle of the first electrical connection bar 131, making the structure of the energy storage device 100 more uniform, and thus the structural strength more uniform. Moreover, the cells 11 on both sides of the partition 14 can restrain each other, which can reduce and avoid the torsion of the energy storage device 100.

[0068] Continue to refer to Figure 2 In some embodiments, along the second direction Y, the two ends of the partition 14 are located outside the two ends of any cell 11, that is, along the second direction Y, the two ends of the partition 14 extend beyond the two ends of any cell 11.

[0069] In the second direction Y, the two ends of the partition 14 are located on the outside of the cell 11. In this way, when subjected to external pressure, the partition 14 can play a resisting role, which can prevent the cell 11 from being directly squeezed and thus prevent the cell 11 from being damaged.

[0070] For example, along the second direction Y, the distance D between any end of the partition 14 and the corresponding end of the cell 11 can satisfy: 1mm≤D≤20mm, for example, D is 1.5mm, 1.8mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, 12mm, 14mm, 16mm or 18mm, etc.

[0071] In the second direction Y, by controlling the distance between the two ends of the separator 14 and the two ends of the cell 11 within a suitable range, it can be avoided that if the distance is too small, the cell 11 cannot be effectively protected, or if the distance is too large, the ineffective volume of the energy storage device 100 will be too large, thus reducing the energy density of the battery.

[0072] Preferably, D can satisfy: 1mm≤D≤4mm. By controlling the distance between the two ends of the separator 14 and the two ends of the battery cell 11 within the preferred range, it can better avoid the situation where the distance is too small and cannot effectively protect the battery cell 11, or the distance is too large and causes the ineffective volume of the energy storage device 100 to be too large, thereby reducing the energy density of the battery.

[0073] In one example, it can be simultaneously satisfied that, along the second direction Y, the two ends of the partition 14 are located outside the two ends of any cell 11, and the distance D between any end of the partition 14 and the corresponding end of the cell 11 can satisfy: 1mm≤D≤20mm.

[0074] refer to Figure 1 and Figure 2 In some embodiments, the first electrical connection bar 131 may further include a first extension 1313 and a second extension 1314.

[0075] The first extension 1313 is formed by extending partly along the second direction Y from the first connecting portion 1311 toward the second connecting portion 1312. Along the second direction Y, the length of the second connecting portion 1312 is greater than the length of the first extension 1313, and a first step 1315 is formed between the two.

[0076] The second extension 1314 is formed by extending part of the second connecting portion 1312 toward the first connecting portion 1311 along the second direction Y. Along the second direction Y, the length of the first connecting portion 1311 is greater than the length of the second extension 1314 and a second step 1316 is formed between the two.

[0077] In one example, the following conditions can be met simultaneously: the first extension 1313 is formed by extending partially along the second direction Y from the side of the first connecting portion 1311 toward the second connecting portion 1312. Along the second direction Y, the length of the second connecting portion 1312 is greater than the length of the first extension 1313, and a first step 1315 is formed between the two. The second extension 1314 is formed by extending partially along the second direction Y from the side of the second connecting portion 1312 toward the first connecting portion 1311, and along the second direction Y, the length of the first connecting portion 1311 is greater than the length of the second extension 1314, and a second step 1316 is formed between the two.

[0078] The first electrical connector 131 connects at least one first tab 111 of a battery cell 11 and at least one second tab 112 of another battery cell 11, and needs to have a certain current-carrying capacity. If the area of ​​the connection between the first connection portion 1311 and the second connection portion 1312 is too small, the current-carrying capacity is insufficient, which can easily lead to damage to the part. Therefore, by providing a first extension portion 1313 and / or a second extension portion 1314 at the connection portion, the area of ​​their connection portion can be increased, which can ensure the current-carrying capacity of the connection portion between the first connection portion 1311 and the second connection portion 1312 of the first electrical connector 131.

[0079] refer to Figure 2 In some embodiments, the tab holder 12 may include a first protrusion 123 and a second protrusion 124. Along the third direction Z, the tops of the first protrusion 123 and the second protrusion 124 are higher than the top of the first electrical connector 131, and are respectively disposed opposite to the first extension 1313 and the second extension 1314.

[0080] Along the second direction Y, the surfaces of the first protrusion 123 and / or the second protrusion 124 are formed with grooves. For example, the first protrusion 123 is recessed in the middle of the portion of the first step 1315 to form a groove, and / or the second protrusion 124 is recessed in the middle of the portion of the second step 1316 to form a groove.

[0081] In one example, the tab holder 12 may simultaneously include a first protrusion 123 and a second protrusion 124. Along the third direction Z, the tops of the first protrusion 123 and the second protrusion 124 are higher than the top of the first electrical connector 131, and are respectively disposed opposite to the first extension 1313 and the second extension 1314. Along the second direction Y, grooves are formed on the surfaces of the first protrusion 123 and / or the second protrusion 124.

[0082] Due to the presence of the first extension 1313 and the second extension 1314, the distance between the connection portion between the first connecting portion 1311 and the second connecting portion 1312 and the adjacent electrical connection busbar is small, making it prone to short circuits. By providing the first protrusion 123 and the second protrusion 124, the connection portion between the first connecting portion 1311 and the second connecting portion 1312 can be separated from the adjacent electrical connection busbar, preventing short circuits. The portion of the first protrusion 123 located at the first step 1315 has a large thickness and area, and the portion of the second protrusion 124 located at the second step 1316 has a large thickness and area, making it difficult for the core to solidify during molding, such as injection molding. The portion of the first protrusion 123 located at the first step 1315 is recessed in the middle, and the portion of the second protrusion 124 located at the second step 1316 is recessed in the middle, which reduces the thickness at these locations and ensures molding quality.

[0083] refer to Figure 1 In some embodiments, along the second direction Y, the end of the first connecting portion 1311 near the partition 14 may be formed with a chamfer 1317.

[0084] Along the second direction Y, the end of the second connecting portion 1312 near the partition 14 may have a chamfer 1317.

[0085] In one example, it can be simultaneously satisfied that, along the second direction Y, the end of the first connecting part 1311 near the partition 14 has a chamfer 1317, and the end of the second connecting part 1312 near the partition 14 can also have a chamfer 1317.

[0086] The ends of the first connecting portion 1311 and the second connecting portion 1312 are close to the partition 14. When installing the partition 14 to the tab bracket 12, connectors such as screws need to pass through the first connecting portion 1311 and the second connecting portion 1312, which is inconvenient for drilling and prone to short circuits. By forming bevels on the ends of the first connecting portion 1311 and the second connecting portion 1312 near the partition 14, screws can be avoided, facilitating installation and preventing short circuits.

[0087] Below, in conjunction with Figure 1 and Figure 2The structure and arrangement of multiple electrical connection bars are described in detail below. These multiple electrical connection bars may further include a main positive connection bar 134, a main negative connection bar 135, a second electrical connection bar 132, and a third electrical connection bar 133. Along the first direction X, the second electrical connection bar 132 and the main positive connection bar 134 are located on one side of the first electrical connection bar 131, and the third electrical connection bar 133 and the main negative connection bar 135 are located on the other side of the first electrical connection bar 131. Along the second direction Y, the second electrical connection bar 132 and the main positive connection bar 134 are arranged opposite each other, and the third electrical connection bar 133 and the main negative connection bar 135 are arranged opposite each other. The main positive connection bar 134 and the main negative connection bar 135 are located in the corner region of the edge of the tab support 12.

[0088] The aforementioned corner region refers to the area located near the intersection of any two edges on the tab support 12, at a distance from the two edges that is 1% to 40% (e.g., 5%, 10%, 15%, 20%, 30%, or 35%) of the length of the two edges.

[0089] The main positive terminal block 134 and the main negative terminal block 135 have large flow rates, resulting in high heat generation. Placing them at the edge of the tab bracket 12 improves heat dissipation and prevents the corner areas of the bracket from aging due to excessive heat.

[0090] It should be noted that this application does not limit the number of intermediate electrical connection blocks, and those skilled in the art can choose to set them according to the needs of specific application scenarios. In this document, intermediate electrical connection blocks refer to the remaining electrical connection blocks other than the total positive electrical connection block 134 and the total negative electrical connection block 135.

[0091] The main positive connection bus 134 and the main negative connection bus 135 can be copper busbars, while the first connection bus 131, the second connection bus 132 and the third connection bus 133 can be aluminum busbars.

[0092] The main positive terminal block 134 and the main negative terminal block 135 need to have good current carrying capacity and heat dissipation capacity, so they are made of copper, which provides good current carrying capacity and heat dissipation capacity. Meanwhile, the remaining terminal blocks are made of aluminum, which can reduce manufacturing costs.

[0093] For example, the thickness of the copper busbar is T1, and the thickness of the aluminum busbar is T2. T1 and T2 satisfy: 0.4≤T1 / T2≤0.6.

[0094] When a battery experiences thermal runaway, gas is generated. To prevent gas accumulation and potential battery explosion, the gas needs to be expelled from the battery. By controlling the thickness of the copper busbars located in the corner areas of the support structure within the aforementioned range, good deformability is achieved. This allows the support structure to deform under gas impact, thus facilitating the gas expulsion.

[0095] In one example, the following conditions can be met simultaneously: the main positive connection bus 134 and the main negative connection bus 135 can be copper busbars, and the first connection bus 131, the second connection bus 132, and the third connection bus 133 can be aluminum busbars. The thickness of the aluminum busbar is T1, and the thickness of the aluminum busbar is T2. T1 and T2 satisfy: 0.4 ≤ T1 / T2 ≤ 0.6.

[0096] In the first direction X, the minimum distance between the main positive electrical connection bar 134 and the first electrical connection bar 131 is greater than the minimum distance between the second electrical connection bar 132 and the first electrical connection bar 131, and also greater than the minimum distance between the third electrical connection bar 133 and the first electrical connection bar 131. That is, in the first direction X, the distance between the main positive electrical connection bar 134 and its adjacent electrical connection bars is greater than the distance between the intermediate electrical connection bars.

[0097] In the first direction X, the minimum distance between the main negative electrical connection 135 and the first electrical connection 131 is greater than the minimum distance between the second electrical connection 132 and the first electrical connection 131, and also greater than the minimum distance between the third electrical connection 133 and the first electrical connection 131. That is, in the first direction X, the distance between the main negative electrical connection 135 and its adjacent electrical connection 135 is greater than the distance between the intermediate electrical connection 135.

[0098] In one example, it can be simultaneously satisfied that, in the first direction X, the minimum distance between the total positive electrical connection bar 134 and the first electrical connection bar 131 is greater than the minimum distance between the second electrical connection bar 132 and the first electrical connection bar 131, and is also greater than the minimum distance between the third electrical connection bar 133 and the first electrical connection bar 131; the minimum distance between the total negative electrical connection bar 135 and the first electrical connection bar 131 is greater than the minimum distance between the second electrical connection bar 132 and the first electrical connection bar 131, and is also greater than the minimum distance between the third electrical connection bar 133 and the first electrical connection bar 131.

[0099] In this way, in the first direction X, the distance between the main positive electrical connection 134 and the main negative electrical connection 135 and the adjacent intermediate electrical connection 13 is relatively large, which can avoid heat accumulation.

[0100] On the projection plane perpendicular to the third direction Z, the orthographic projection of the tab bracket 12 has an area S1, and the multiple electrical connection bars 13 have an area S2. S1 and S2 satisfy: 60% ≤ S1 / S2 ≤ 90%, for example, S1 / S2 is 65%, 70%, 75%, 80%, or 85%, etc.

[0101] In this way, the area of ​​the tab support 12 can be fully utilized for the arrangement of the electrical connection bar 13, and the overall structural strength of the tab support 12 can be guaranteed, thereby improving the overall structural strength of the energy storage device 100 and thus improving the structural strength of the battery.

[0102] refer to Figure 2The energy storage device 100 may also include fasteners 30 (e.g., expansion rivets or bolts) and a housing portion 20. The tab support 12 has a through hole through which the fasteners 30 connect the tab support 12 to the housing portion 20. The through hole avoids the corner region of the edge of the tab support 12. Here, the extent of the corner region is as described above and will not be repeated here.

[0103] When the energy storage device 100 is installed inside the casing, it is usually necessary to form an exhaust gap in the corner area of ​​the casing and the tab support 12 to facilitate the discharge of gas along the exhaust channel in the event of thermal runaway, and to prevent the gas from directly impacting the BMS protection board and causing damage to the BMS protection board. If the casing and the tab support 12 are connected together in the corner area, an exhaust gap cannot be formed, and the corner area cannot deform, so the gas accumulated in the battery will directly impact and damage the BMS protection board.

[0104] Therefore, by avoiding the corner area of ​​the edge of the tab bracket 12, the corner area of ​​the edge of the tab bracket 12 can deform upward when gas is generated due to thermal runaway of the cell 11, so that the gas can be smoothly discharged from the corner area of ​​the edge of the tab bracket 12, avoiding damage to other parts of the battery such as the circuit board.

[0105] refer to Figure 4 and Figure 5 The energy storage device 100 may further include a housing portion 20. The housing portion 20 has a receiving cavity 21, within which a plurality of battery cells 11 and electrode holders 12 are located. The corners of the electrode holders 12 have a gap A with the inner wall of the receiving cavity 21, where A satisfies: 0.1mm ≤ A ≤ 25mm. For example, A can be 0.5mm, 1mm, 2mm, 3mm, 5mm, 7mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, or 24mm, etc. Here, the corner of the electrode holder 12 refers to the position where two edges intersect.

[0106] For example, the housing portion 20 may include an upper housing 22 and a lower housing 23. The tab support 12 can be fixed to the lower housing 23 by bolts and bolts pre-embedded in the lower housing 23. The inner wall surface of the accommodating cavity 21 of the lower housing 23 and the corner of the tab support 12 cooperate to form an exhaust gap A.

[0107] Thus, by setting a reasonable gap A between the corner of the tab support 12 and the inner wall of the accommodating cavity 21, gas can be discharged through the venting gap between the corner area of ​​the tab support 12 and the housing 20 when the cell 11 experiences thermal runaway and generates gas, thus preventing damage to other parts of the battery, such as the circuit board. By controlling the gap A within the aforementioned range, it is possible to avoid insufficient venting due to an excessively small gap, or ineffective utilization of the space in the accommodating cavity 21 due to an excessively large gap, which would significantly reduce the energy density of the energy storage device 100.

[0108] It should be noted that the construction of other aspects of the energy storage device 100 can refer to the conventional construction of batteries in the field, and for the sake of brevity, this application will not elaborate on them.

[0109] In this application, the energy storage device 100 can be used for a small start-stop battery pack for starting and stopping electrical equipment, or it can be a large energy storage battery pack and a power battery pack.

[0110] Below, in conjunction with Figures 1 to 5 Taking the energy storage device 100 as an example, the energy storage device 100 of this application will be described in detail.

[0111] refer to Figures 1 to 5 The energy storage device 100 may include multiple battery cells 11, electrode brackets 12, and multiple electrical connection bars 13.

[0112] Multiple battery cells 11 are stacked along a first direction X. The tab support 12 includes a first tab support portion 121 and a second tab support portion 122 arranged along a second direction Y. Two tabs of each battery cell 11 extend to the first tab support portion 121 and the second tab support portion 122, respectively. In the multiple battery cells 11, every two cells 11 form a group, the two cells 11 in a group are connected in parallel, and the cells 11 in each group are connected in series. The first direction X and the second direction Y are perpendicular.

[0113] Multiple electrical connectors 13 are integrally injection molded with the tab support 12. The multiple electrical connectors 13 include a first electrical connector 131, a total positive electrical connector 134, a total negative electrical connector 135, a second electrical connector 132, and a third electrical connector 133.

[0114] Along the first direction X, the second electrical connector 132 and the main positive connector 134 are located on one side of the first electrical connector 131, and the third electrical connector 133 and the main negative connector 135 are located on the other side of the first electrical connector 131. Along the second direction Y, the second electrical connector 132 and the main positive connector 134 are arranged opposite to each other, and the third electrical connector 133 and the main negative connector 135 are arranged opposite to each other. The main positive connector 134 and the main negative connector 135 are located in the corner area of ​​the edge of the tab support 12.

[0115] In the first direction X, the minimum distance between the main positive electrical connector 134 and the first electrical connector 131 is greater than the minimum distance between the second electrical connector 132 and the first electrical connector 131, and also greater than the minimum distance between the third electrical connector 133 and the first electrical connector 131. The minimum distance between the main negative electrical connector 135 and the first electrical connector 131 is greater than the minimum distance between the second electrical connector 132 and the first electrical connector 131, and also greater than the minimum distance between the third electrical connector 133 and the first electrical connector 131.

[0116] The main positive terminal block 134 and the main negative terminal block 135 are made of copper, while the first terminal block 131, the second terminal block 132, and the third terminal block 133 are made of aluminum. The thickness of the main positive terminal block 134 and the main negative terminal block 135 is T1, and the thickness of the first terminal block 131, the second terminal block 132, and the third terminal block 133 is T2. T1 and T2 satisfy: 0.4 ≤ T1 / T2 ≤ 0.6.

[0117] On a projection plane perpendicular to the third direction Z, the orthographic projection of the tab holder 12 has an area S1, and the multiple electrical connection bars 13 have an area S2. S1 and S2 satisfy: 60% ≤ S1 / S2 ≤ 90%. The third direction Z is perpendicular to both the first direction X and the second direction Y.

[0118] Along the width direction of the tab support 12, a first electrical connection bar 131 extends from the first tab support portion 121 to the second tab support portion 122, electrically connecting the tabs of two battery cells 11 to the tabs of two other battery cells 11. The first electrical connection bar 131 includes a first connection portion 1311 and a second connection portion 1312. The first connection portion 1311 is located on the first tab support portion 121, and the second connection portion 1312 is located on the second tab support portion 122. The end of the first connection portion 1311 near the partition 14 has a chamfer 1317, and the end of the second connection portion 1312 near the partition 14 also has a chamfer 1317.

[0119] The energy storage device 100 also includes a partition 14. The partition 14 and a plurality of battery cells 11 are stacked along a first direction X and located between two adjacent battery cells 11, and are connected to a tab support 12. On a projection plane perpendicular to a third direction Z, the orthographic projection of the partition 14 partially overlaps with the orthographic projection of the first electrical connection bar 131.

[0120] Along the first direction X, the first connecting part 1311 is located on the first side of the partition 14, and the second connecting part 1312 is located on the second side of the partition 14. The partition 14 is located in the middle of the plurality of battery cells 11. Along the width direction of the tab support 12, both ends of the partition 14 are located on the outer sides of both ends of any battery cell 11, and the distance D between any end of the partition 14 and the corresponding end of the battery cell 11 satisfies: 1mm≤D≤20mm.

[0121] The first electrical connector 131 further includes a first extension 1313 and a second extension 1314. The first extension 1313 is formed by extending partially along the second direction Y from the side of the first connector 1311 toward the second connector 1312, and the second extension 1314 is formed by extending partially along the second direction Y from the side of the second connector 1312 toward the first connector 1311. Along the second direction Y, the length of the second connector 1312 is greater than the length of the first extension 1313 and a first step 1315 is formed therein, and the length of the first connector 1311 is greater than the length of the second extension 1314 and a second step 1316 is formed therein.

[0122] The electrode holder 12 includes a first protrusion 123 and a second protrusion 124. Along the third direction Z, the tops of the first protrusion 123 and the second protrusion 124 are higher than the top of the first electrical connector 131, and are respectively disposed opposite to the first extension 1313 and the second extension 1314. Grooves are formed on the surfaces of the first protrusion 123 and the second protrusion 124.

[0123] The energy storage device 100 also includes a fastener 30 and a housing portion 20. The tab support 12 has a through hole through which the fastener 30 connects the tab support 12 to the housing portion 20. The through hole avoids the corner area of ​​the edge of the tab support 12. The energy storage device 100 also includes the housing portion 20, which has a receiving cavity 21. Multiple battery cells 11 and the tab support 12 are located within the receiving cavity 21. A gap A exists between the corner of the tab support 12 and the inner wall of the receiving cavity 21. A satisfies: 1mm ≤ A ≤ 25mm.

[0124] In this application, the energy storage device 100 may also be a start-stop battery pack, a power battery pack, or an energy storage module, etc.

[0125] It should be noted that the construction of other aspects of the energy storage device 100 can refer to the conventional construction of batteries in the field, and for the sake of brevity, this application will not elaborate on them.

[0126] Exemplary electrical equipment

[0127] Embodiments of this application also provide an electrical device including the aforementioned energy storage device 100. The electrical device has the corresponding effects of the aforementioned battery, which will not be described in detail here.

[0128] It should be noted that the electrical equipment mentioned in this application may be energy storage equipment, such as energy storage cabinets, or energy consuming equipment, such as electric vehicles, drones, and power tools.

[0129] All terms used in this application have the same meaning as understood by one of ordinary skill in the art to which this application pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0130] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0131] It should be understood that the term "comprising" and its variations as used in this application are open-ended, meaning "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least another embodiment".

[0132] It should be understood that although terms such as "first" or "second" may be used in this application to describe various elements (such as the first connecting part and the second connecting part), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0133] It should be noted that, in the description of this application, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0134] It should also be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" 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. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0135] The scope of protection of this application is not limited to the above embodiments. Any variations or substitutions that can be conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An energy storage device (100), characterized in that, include: Multiple battery cells (11) are stacked along a first direction (X); The electrode holder (12) includes a first electrode holder portion (121) and a second electrode holder portion (122) arranged along a second direction (Y), the second direction (Y) being perpendicular to the first direction (X), and two electrodes of each cell (11) extending to the first electrode holder portion (121) and the second electrode holder portion (122), respectively; and Multiple electrical connection bars (13) are integrally formed with the tab support (12) and include a first electrical connection bar (131) extending from the first tab support portion (121) to the second tab support portion (122). The first electrical connection bar (131) electrically connects the tab of at least one battery cell (11) to the tab of at least another battery cell (11).

2. The energy storage device (100) according to claim 1, characterized in that, It also includes a partition (14) and the plurality of cells (11) stacked along the first direction (X), the partition (14) being located between two adjacent cells (11) and connected to the tab support (12).

3. The energy storage device (100) according to claim 2, characterized in that, On a projection plane perpendicular to the third direction (Z), the orthographic projection of the partition (14) partially overlaps with the orthographic projection of the first electrical connection bar (131); the third direction (Z) is perpendicular to both the first direction (X) and the second direction (Y).

4. The energy storage device (100) according to claim 3, characterized in that, The first electrical connector (131) includes a first connector (1311) and a second connector (1312). The first connector (1311) is located on the first tab support portion (121), and the second connector (1312) is located on the second tab support portion (122). In the first direction (X), the first connector (1311) is located on the first side of the partition (14), and the second connector (1312) is located on the second side of the partition (14). The first connecting part (1311) is connected to the at least one battery cell (11), and the second connecting part (1312) is connected to the at least one other battery cell (11). In the first direction (X), the at least one battery cell (11) is located on the first side of the partition (14), and the at least one other battery cell (11) is located on the second side of the partition (14).

5. The energy storage device (100) according to any one of claims 2 to 4, characterized in that, In the first direction (X), the distance between the partition (14) and one side of the plurality of battery cells (11) is D1, and the distance between the two sides of the plurality of battery cells (11) is D2, where D1 and D2 satisfy: 1 / 3 ≤ D1 / D2 ≤ 2 / 3.

6. The energy storage device (100) according to any one of claims 2 to 4, characterized in that, Along the second direction (Y), the two ends of the separator (14) are located outside the two ends of any of the cells (11); and / or Along the second direction (Y), the distance D between any end of the partition (14) and the corresponding end of the battery cell (11) satisfies: 1mm≤D≤20mm.

7. The energy storage device (100) according to claim 4, characterized in that, The first electrical connection bar (131) further includes a first extension (1313) and a second extension (1314); The first extension (1313) is formed by extending partially along the second direction (Y) from the first connecting portion (1311) toward the second connecting portion (1312). Along the second direction (Y), the length of the second connecting portion (1312) is greater than the length of the first extension (1313) and a first step (1315) is formed thereon, and / or The second extension (1314) is formed by the second connecting portion (1312) extending partially along the second direction (Y) toward the side of the first connecting portion (1311). Along the second direction (Y), the length of the first connecting portion (1311) is greater than the length of the second extension (1314) and a second step (1316) is formed.

8. The energy storage device (100) according to claim 7, characterized in that, The electrode holder (12) includes a first protrusion (123) and a second protrusion (124); Along the third direction (Z), the tops of the first protrusion (123) and the second protrusion (124) are higher than the top of the first electrical connection bar (131), and are respectively disposed opposite to the first extension (1313) and the second extension (1314), and / or The first protrusion (123) and / or the second protrusion (124) have grooves formed on their surfaces.

9. The energy storage device (100) according to claim 7, characterized in that, Along the second direction (Y), the end of the first connecting portion (1311) near the partition (14) has a chamfer (1317); and / or The end of the second connecting part (1312) near the partition (14) has a chamfer (1317).

10. The energy storage device (100) according to any one of claims 1 to 4, characterized in that, The plurality of electrical connection bars (13) further include a total positive electrical connection bar (134), a total negative electrical connection bar (135), a second electrical connection bar (132), and a third electrical connection bar (133); and Along the first direction (X), the second electrical connector (132) and the total positive electrical connector (134) are located on one side of the first electrical connector (131), and the third electrical connector (133) and the total negative electrical connector (135) are located on the other side of the first electrical connector (131). Along the second direction (Y), the second electrical connector (132) and the total positive electrical connector (134) are arranged opposite to each other, and the third electrical connector (133) and the total negative electrical connector (135) are arranged opposite to each other. The total positive electrical connector (134) and the total negative electrical connector (135) are located in the corner region of the edge of the tab support (12).

11. The energy storage device (100) according to claim 10, characterized in that, The main positive electrical busbar (134) and the main negative electrical busbar (135) are copper busbars, and the first electrical busbar (131), the second electrical busbar (132), and the third electrical busbar (133) are aluminum busbars; and / or The thickness of the total positive electrical connection bus (134) and the total negative electrical connection bus (135) is T1, and the thickness of the first electrical connection bus (131), the second electrical connection bus (132), and the third electrical connection bus (133) is T2, where T1 and T2 satisfy: 0.4≤T1 / T2≤0.

6.

12. The energy storage device (100) according to claim 10, characterized in that, In the first direction (X), the minimum distance between the total positive electrical connection bar (134) and the first electrical connection bar (131) is greater than the minimum distance between the second electrical connection bar (132) and the first electrical connection bar (131), and greater than the minimum distance between the third electrical connection bar (133) and the first electrical connection bar (131); and / or The minimum distance between the total negative electrical connection bar (135) and the first electrical connection bar (131) is greater than the minimum distance between the second electrical connection bar (132) and the first electrical connection bar (131), and is also greater than the minimum distance between the third electrical connection bar (133) and the first electrical connection bar (131).

13. The energy storage device (100) according to any one of claims 1 to 4, characterized in that, On a projection plane perpendicular to the third direction (Z), the orthographic projection of the tab support (12) has an area S1, and the plurality of electrical connection bars (13) have an area S2, wherein S1 and S2 satisfy: 60% ≤ S1 / S2 ≤ 90%; and The third direction (Z) is perpendicular to both the first direction (X) and the second direction (Y).

14. The energy storage device (100) according to any one of claims 1 to 4, characterized in that, It also includes fasteners (30) and a housing portion (20), wherein the electrode bracket (12) is provided with a through hole, and the fasteners (30) connect the electrode bracket (12) to the housing portion (20) through the through hole, wherein the through hole avoids the corner area of ​​the edge of the electrode bracket (12); and / or The energy storage device (100) further includes a housing portion (20) having a receiving cavity (21). The plurality of battery cells (11) and the electrode holder (12) are located within the receiving cavity (21). The corner of the electrode holder (12) has a gap A with the inner wall of the receiving cavity, where A satisfies: 0.1mm≤A≤25mm.

15. An electrical appliance, characterized in that, Includes the energy storage device (100) according to any one of claims 1 to 14.

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