Battery assembly, battery pack and electric equipment

Abstract

The utility model provides a battery assembly, a battery pack and electric equipment, and relates to the technical field of batteries, in the battery assembly, a plurality of battery cell units are arranged along a first direction, each battery cell unit comprises a cover plate assembly and a pole core, one end of each pole core is provided with a pole lug, the cover plate assembly is used for being electrically connected with the pole lug, and a current collecting component extends along the first direction, the current collecting component is electrically connected with the cover plate assemblies of the plurality of battery cell units, and the top surface of the current collecting component is not higher than the top surface of any cover plate assembly in the thickness direction of the cover plate assemblies. According to the battery assembly provided by the embodiment of the invention, the height of the battery assembly is prevented from being further increased by the current collecting component, the relatively large space occupied by the battery assembly in the height direction is reduced, the volume of the assembled battery pack is reduced, and the space occupancy rate of the battery pack in electric equipment can be reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery assembly, a battery pack and an electrical device. Background Art

[0002] A battery pack generally includes multiple single cell units, each of which includes a cover plate assembly. The cover plate assemblies can be electrically connected through a bus bar, and the resulting battery pack can be used to provide electrical energy to electrical devices.

[0003] However, the battery assembly in the above-mentioned related art occupies a large space in the height direction, which results in a large volume of the assembled battery pack and causes the battery pack to occupy a large space of the electrical equipment. Utility Model Content

[0004] The embodiments of the present application provide a battery assembly, a battery pack and an electrical device, which are used to solve the technical problem in the above-mentioned related technologies that the battery assembly occupies a large space in the height direction, resulting in a large volume of the assembled battery pack and causing the battery pack to occupy a large space in the electrical device.

[0005] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0006] A first aspect of an embodiment of the present application provides a battery assembly, comprising:

[0007] A plurality of battery cell units, wherein the plurality of battery cell units are arranged along a first direction,

[0008] Each of the battery cell units includes a cover plate assembly and a pole core, one end of the pole core has a pole ear, and the cover plate assembly is used to be electrically connected to the pole ear;

[0009] a current collecting member extending along the first direction and electrically connected to the cover plate assemblies of the plurality of battery cell units;

[0010] Along the thickness direction of the cover plate assembly, the top surface of the current collecting member is not higher than the top surface of any of the cover plate assemblies.

[0011] An embodiment of the present application provides a battery assembly that electrically connects multiple battery cells within the battery assembly by using a current collecting member to electrically connect the cover plate assembly disposed on each pole core. Furthermore, by ensuring that the top surface of the current collecting member is no higher than the top surface of any of the cover plate assemblies in the thickness direction of the cover plate assembly, this arrangement, compared to the prior art arrangement of placing the current collecting member on the top surface of the cover plate assembly, prevents the current collecting member from further increasing the height of the battery assembly, reduces the significant height space occupied by the battery assembly, reduces the volume of the assembled battery pack, and reduces the space occupied by the battery pack within the electrical device.

[0012] Based on the above technical solution, this application can also be improved as follows.

[0013] In a possible implementation, a height difference between a top surface of the cover plate assembly and a top surface of the current collecting member is greater than or equal to 0 mm and less than or equal to 3 mm.

[0014] Thus, by making the height difference between the top surface of the cap plate assembly and the top surface of the current collecting member greater than or equal to 0, the top surface of the current collecting member can be prevented from being higher than the top surface of the cap plate assembly, thereby preventing the current collecting member from increasing the height of the battery assembly.

[0015] If the height difference between the top surface of the cover plate assembly and the current collecting component is greater than 3mm, in order to ensure that there is sufficient welding area between the current collecting component and the cover plate assembly, there will be a large part of the cover plate assembly that is not used for the two current collecting components, resulting in low space utilization of the cover plate assembly and increased height of the battery cell unit, resulting in a large space occupation of the battery assembly in the height direction.

[0016] In one possible implementation, the cover plate assembly includes:

[0017] A cover plate body, wherein the cover plate body is electrically connected to the pole lug of the pole core, a portion of the cover plate body is exposed at the end face of the pole core, and in the thickness direction of the cover plate body, the height of the exposed portion of the cover plate body is greater than or equal to 0.5 mm and less than or equal to 8 mm.

[0018] In this way, if the height of the exposed part of the cover body is less than 0.5 mm, the connection area between the cover body and the current collecting component will be smaller, resulting in reduced connection stability between the current collecting component and the cover body, and the current passing capacity at the connection between the current collecting component and the cover body will be poor, resulting in increased heat generation and loss of electric energy.

[0019] If the height of the exposed part of the cover body is greater than 8mm, on the one hand, it will lead to waste of the cover body and increase the manufacturing cost of the battery assembly. On the other hand, it will cause the height of the cover body in the height direction of the battery cell unit to be too large, increasing the space occupancy of the battery assembly in the height direction.

[0020] In a possible implementation, the current collecting component is located on one side of the cover plate assembly and is electrically connected to the side surfaces of each of the cover plate assemblies.

[0021] In this way, by arranging the current collecting member on the side of the cover plate assembly, the space occupied by the current collecting member in the height direction of the battery cell unit can be reduced, thereby helping to reduce the height of the battery assembly.

[0022] In a possible implementation, the current collecting component includes:

[0023] At least one weak section is provided, and along the first direction, the weak section is located in a space between two adjacent cover plate assemblies.

[0024] In this way, by setting a weak section in the interval between two adjacent cover plate assemblies, the weak section is more easily melted and broken by high temperature than other parts on the current collecting component, so that when thermal runaway occurs in the battery cell unit, the weak section closest to the faulty battery cell unit can break, thereby avoiding further thermal runaway.

[0025] In a possible implementation, the length of the weak section is smaller than the maximum spacing distance between two adjacent cover plate assemblies.

[0026] By making the length of the weak section shorter than the maximum spacing between two adjacent cover plate assemblies, the battery cells corresponding to the two cover plate assemblies can be disconnected when the weak section is melted. If the weak section is too long, for example, if the weak section is connected to the side of the cover plate assembly, the portion of the weak section connected to the cover plate assembly is less likely to melt than the portion located within the gap between the two cover plate assemblies. This will not only reduce the overall structural strength of the current collecting component, but also fail to achieve the desired melting effect of the longer weak section.

[0027] In a possible implementation, the current collecting component further includes a plurality of connecting segments, the connecting segments are connected to the cover plate assembly, and the weak segment is located between two adjacent connecting segments.

[0028] In this way, by arranging the weak section between two adjacent connecting sections, the connecting sections are connected to the side of the current collecting component, so as to realize the function of the current collecting component connecting the plurality of cover plate assemblies.

[0029] In a possible implementation, along the thickness direction of the cover plate assembly, the height of the weak section is smaller than the height of the connecting section.

[0030] In this way, along the height direction of the cover assembly, by making the height of the weak section smaller than the height of the connecting section, the cross-sectional area of ​​the weak section can be made smaller relative to the cross-sectional area of ​​the connecting section, and the resistance of the weak section can be made larger. When thermal runaway occurs in the battery cell unit, the weak section is more likely to melt, thereby achieving the effect of melting protection.

[0031] In a possible implementation, a ratio of the height of the weak section to the height of the connecting section is greater than or equal to 0.2 and less than or equal to 0.8.

[0032] In this way, if the ratio of the height of the weak section to the height of the connecting section is greater than or equal to 0.8, the difference between the cross-sectional area of ​​the weak section and the cross-sectional area of ​​the connecting section will be smaller, which will in turn cause the current overcurrent capacity of the weak section to be almost the same as the current overcurrent capacity of the connecting section, which is not conducive to achieving the effect of high-temperature melting of the weak section and the connecting section first, that is, the melting protection effect of the weak section is poor.

[0033] If the ratio of the height of the weak section to the connecting section is less than or equal to 0.2, the cross-sectional area of ​​the weak section will be too small, resulting in too low structural strength of the weak section, which in turn will lead to low overall structural strength of the current collecting component and easy damage to the current collecting component.

[0034] In a possible implementation, along the first direction, a maximum distance between the cover plate assemblies on the two outermost battery cell units is greater than a length of the current collecting member.

[0035] In this way, along the first direction, the maximum distance between the cover assemblies on the two outermost battery cell units among the multiple battery cell units is greater than the length of the current collecting component, which can avoid material waste of the current collecting component due to the excessive length of the current collecting component, reduce the manufacturing cost of the current collecting component, and reduce the manufacturing cost of the battery assembly.

[0036] In a possible implementation, the height of the current collecting member is H1, the thickness of the current collecting member is L0, the current carrying capacity of the electrode core is A, and the current carrying coefficient is K:

[0037] The L0, H1, A and K satisfy: L0×H1×K≥A.

[0038] In this way, the current collecting component can meet the flow requirements between two adjacent battery cells, avoiding excessive power loss due to too small flow area of ​​the current collecting component, and ensuring the working performance of the battery assembly.

[0039] In a possible implementation, the thickness of the current collecting member is greater than or equal to 0.6 mm and less than or equal to 3 mm.

[0040] Therefore, if the thickness of the current collecting component is less than 0.6 mm, the probability of the current collecting component breaking and damaging due to its low structural strength increases. If the thickness of the current collecting component is greater than 3 mm, it is difficult to weld through the current collecting component when welding it to the cover plate assembly using the laser penetration welding process, thereby reducing the weldability of the current collecting component.

[0041] A second aspect of an embodiment of the present application provides a battery pack comprising the above-mentioned battery assembly.

[0042] The battery pack provided in the embodiment of the present application can reduce the height of the battery pack and thereby reduce the space occupancy of the battery pack by using the above-mentioned battery assembly.

[0043] A third aspect of the embodiments of the present application provides an electric device, which includes an electric device and a battery pack;

[0044] The battery adopts the battery pack as described above, and the battery pack is used to provide electrical energy to the electrical device.

[0045] An embodiment of the present application provides an electrical device. By installing a battery pack in the electrical device, the space occupied by the battery pack in the electrical device can be reduced, so that more space in the electrical device is available for installing other structural components. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0047] Figure 1 A schematic structural diagram of the first battery assembly provided in an embodiment of the present application;

[0048] Figure 2 A schematic structural diagram of a second battery assembly provided in an embodiment of the present application;

[0049] Figure 3 A schematic structural diagram of a battery assembly from another perspective provided in an embodiment of the present application;

[0050] Figure 4 for Figure 1 Schematic diagram of the local structure at A in FIG;

[0051] Figure 5 for Figure 3 Schematic diagram of the local structure at B in FIG;

[0052] Figure 6 A schematic structural diagram of a cover assembly of a cell unit of a battery assembly provided in an embodiment of the present application.

[0053] Description of reference numerals:

[0054] 10-battery assembly;

[0055] 100-cell unit;

[0056] 110-cover plate assembly; 120-housing;

[0057] 111-cover body; 112-insulating ring; 113-metal ring;

[0058] 200-current collecting component;

[0059] 210-weak section; 220-connecting section; 230-groove. DETAILED DESCRIPTION

[0060] As described in the background art, the battery assembly in the related art occupies a large space in the height direction, which results in a larger volume of the assembled battery pack and causes the battery pack to occupy a larger space in the electrical equipment.

[0061] To address the above technical issues, embodiments of the present application provide a battery assembly, a battery pack, and an electrical device. By using a current collecting member to electrically connect the cover plate assembly disposed on each pole core, multiple battery cells in the battery assembly are electrically connected. Furthermore, by ensuring that the top surface of the current collecting member is no higher than the top surface of any of the cover plate assemblies in the thickness direction of the cover plate assembly, compared to the prior art arrangement of disposing the current collecting member on the top surface of the cover plate assembly, the current collecting member is prevented from further increasing the height of the battery assembly, thereby reducing the large space occupied by the battery assembly in the height direction, reducing the volume of the assembled battery pack, and reducing the space occupied by the battery pack within the electrical device.

[0062] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0063] refer to Figure 1 、 Figure 2 and Figure 3 An embodiment of the present application provides a battery assembly 10 , which may include a plurality of battery cell units 100 and a current collecting member 200 .

[0064] The plurality of battery cell units 100 are arranged along a first direction (eg Figure 1 It is understood that the first direction can be as shown in the arrow x. Figure 1 In another embodiment, the first direction may also be the width direction of the battery cell unit 100.

[0065] Each battery cell unit 100 may include a cap assembly 110 and a pole core. At least one end of the pole core has a pole tab, and the cap assembly 110 is used to be electrically connected to the pole tab.

[0066] The battery cell unit 100 may further include a shell 120 , in which the pole core is disposed. The shell 120 has an opening. The cover assembly 110 can be covered on the opening of the shell 120 and can be electrically connected to the pole tab on one end of the pole core facing the opening.

[0067] The current collecting member 200 can extend along the arrangement direction of the plurality of battery cells 100, for example, the current collecting member 200 extends along the first direction, and the current collecting member 200 is electrically connected to the cover plate assembly 110 of the plurality of battery cells 100. In some embodiments, the current collecting member 200 can be welded to the cover plate assembly 110 by welding.

[0068] In a specific implementation, the current collecting member 200 is welded to the cap plate assembly 110 by using a laser penetration welding process.

[0069] Along the thickness direction of the cover plate assembly 110 (eg Figure 1 As shown by arrow Y in FIG), the top surface of the current collecting member 200 is not higher than the top surface of any cap assembly 110, so as to prevent the portion of the current collecting member 200 higher than the top surface of the cap assembly 110 from increasing the height of the battery cell unit 100.

[0070] The present embodiment provides a battery assembly 10 that electrically connects the cap plate assembly 110 disposed on each pole core using a current collecting member 200, thereby electrically connecting the multiple battery cells 100 in the battery assembly 10. Furthermore, by ensuring that the top surface of the current collecting member 200 is no higher than the top surface of any of the cap plate assemblies 110 in the thickness direction of the cap plate assemblies 110, compared to the prior art arrangement of disposing the current collecting member 200 on the top surface of the cap plate assembly 110, the current collecting member 200 is prevented from further increasing the height of the battery assembly 10, thereby reducing the large space occupied by the battery assembly 10 in the height direction, reducing the volume of the assembled battery pack, and reducing the space occupied by the battery pack within the electrical device.

[0071] refer to Figure 4 In some embodiments, the height difference between the top surface of the cover plate assembly 110 and the top surface of the current collecting member 200 (eg Figure 4 For example, the height difference between the top surface of the cover plate assembly 110 and the top surface of the current collecting member 200 may be one of 0 mm, 1 mm, 1.5 mm, 2 mm, and 2.7 mm.

[0072] In this way, by making the height difference M between the top surface of the cap plate assembly 110 and the top surface of the current collecting member 200 greater than or equal to 0 mm, the top surface of the current collecting member 200 can be prevented from being higher than the top surface of the cap plate assembly 110, thereby preventing the current collecting member 200 from increasing the height of the battery assembly 10.

[0073] If the height difference M between the top surface of the cover plate assembly 110 and the current collecting component 200 is greater than 3 mm, in order to ensure that there is sufficient welding area between the current collecting component 200 and the cover plate assembly 110, there will be a large portion of the cover plate assembly 110 that is not used for welding the current collecting component 200, resulting in low space utilization of the cover plate assembly 110 and increasing the height of the battery cell unit 100, resulting in a larger space occupation of the battery assembly 10 in the height direction. Therefore, the height difference M between the top surface of the cover plate assembly 110 and the current collecting component 200 is less than or equal to 3 mm.

[0074] refer to Figure 4 and Figure 5 In a possible implementation, the cover plate assembly 110 may include a cover plate body 111. The cover plate body 111 is electrically connected to the pole lug of the pole core, and a portion of the cover plate body 111 is exposed at the end surface of the pole core, and in the thickness direction of the cover plate body 111, the height of the exposed portion of the cover plate body 111 (e.g., Figure 4 The height H2 in FIG is greater than or equal to 0.5 mm and less than or equal to 8 mm. For example, the height of the exposed portion of the cover body 111 can be one of 0.8 mm, 3 mm, 5 mm, 6.5 mm, and 7 mm. It is understood that the exposed portion can be the portion that can be directly seen by the operator.

[0075] In this way, if the height H2 of the exposed part of the cover body 111 is less than 0.5 mm, the connection area between the cover body 111 and the current collecting component 200 will be smaller, resulting in reduced connection stability between the current collecting component 200 and the cover body 111, and the current passing capacity at the connection between the current collecting component 200 and the cover body 111 will be poor, resulting in increased heat generation and loss of electric energy.

[0076] If the height H2 of the exposed portion of the cover body 111 is greater than 8 mm, on the one hand, the cover body 111 will be wasted, increasing the manufacturing cost of the battery assembly 10, and on the other hand, the cover body 111 will be too high in the height direction of the battery cell unit 100 (e.g., Figure 4 The height of the exposed portion of the cover body 111 (as shown by the arrow Y in FIG) is too large, which increases the space occupancy of the battery assembly 10 in the height direction. Figure 4 The height H2 shown in the figure is less than or equal to 8 mm.

[0077] refer to Figure 6In some embodiments, the cover assembly 110 may further include an insulating ring 112 and a metal ring 113. The metal ring 113 is disposed on the outside of the insulating ring 112 and is welded to the housing 120 of the battery cell unit 100 via the metal ring 113. The insulating ring 112 has a through hole, and the cover body 111 is disposed on the insulating ring 112. A portion of the cover body 111 is located within the through hole and is electrically connected to the tab on the electrode core. Another portion of the cover body 111 is exposed outside the insulating ring 112, and the exposed surface of the cover body 111 is connected to the current collecting member 200.

[0078] In an exemplary embodiment, in a direction perpendicular to the side surface of the current collecting member 200 connected to the cover body 111, there is a gap between the side surface of the cover body 111 and the side surface of the insulating ring 112, and the current collecting member 200 is located in the gap, thereby preventing the current collecting member 200 from protruding from the side surface of the insulating ring 112.

[0079] In some embodiments, the cover body 111 can be formed by stamping. The material of the cover body 111 can be aluminum, steel, a copper-aluminum composite material, a steel-aluminum composite material, a steel-nickel-plated steel material, or a copper-nickel-plated copper material. The cover body 111 does not react with the electrolyte. The material of the insulating ring 112 can be ceramic, polyphenylene sulfide (PPS) injection molding material, or glass.

[0080] refer to Figure 4 and Figure 5 In one possible implementation, the current collecting member 200 is located on one side of the cover plate assembly 110 and is electrically connected to the side surfaces of each cover plate assembly 110. Specifically, the current collecting member 200 can be located on the side of the cover plate assembly 110 so that the current collecting member 200 is connected to the side surface of the cover plate assembly 110.

[0081] In this way, by disposing the current collecting member 200 on the side of the cap plate assembly 110 , the space occupied by the current collecting member 200 in the height direction of the battery cell unit 100 can be reduced, thereby helping to reduce the height of the battery assembly 10 .

[0082] refer to Figure 4 and Figure 5 In some embodiments, the current collecting member 200 may include at least one weak section 210. Along the first direction, the weak section 210 is located in the gap between two adjacent cover plate assemblies 110. It is understood that when all regions of the current collecting member 200 are exposed to the same environment, the weak section 210 is more likely to melt than other regions of the current collecting member 200. This is because the current carrying capacity of the weak section 210 is lower than that of other regions of the current collecting member 200. As a result, the weak section 210 has a higher resistance and is more likely to generate heat.

[0083] In this way, by setting a weak section 210 at the interval between two adjacent cover plate assemblies 110, the weak section 210 is more easily melted and broken by high temperature than other parts on the current collecting component 200, so that when thermal runaway occurs in the battery cell unit 100, the weak section 210 closest to the faulty battery cell unit 100 can break, thereby avoiding further thermal runaway.

[0084] In one example, if there are two battery cell units 100 in the arrangement direction, there may be one weak section 210, and the weak section 210 is located between the two cover plate assemblies 110 on the two battery cell units 100. If there are n battery cell units 100, the number of weak sections 210 may be n-1, so that there is a weak section 210 between the two cover plate assemblies 110 of each pair of adjacent battery cell units 100.

[0085] refer to Figure 1 and Figure 2 In some embodiments, a groove 230 is formed in the region between two adjacent cover plate assemblies 110 on the current collecting member 200, so that the remaining portion of the region of the current collecting member 200 serves as a weak section 210. The notch of the groove 230 can be as follows along the thickness direction of the cover plate: Figure 1 The notch of the groove 230 may be oriented toward the top surface of the cover assembly 110. Figure 2 The middle portion faces away from the top surface of the cover plate assembly 110 .

[0086] refer to Figure 4 In some embodiments, the length of the weak section 210 (eg Figure 4 The length L1 shown in FIG) is less than the maximum distance between two adjacent cover plate assemblies 110 (as shown in FIG). Figure 4 The distance is shown as the length L2 in the figure.

[0087] Thus, by making the length L1 of the weak section 210 less than the maximum spacing distance L2 between two adjacent cover plate assemblies 110, it is possible to disconnect the battery cells 100 corresponding to the two cover plate assemblies 110 when the weak section 210 is melted. If the weak section 210 is too long, for example, if the weak section 210 is connected to the side of the cover plate assembly 110, the portion of the weak section 210 connected to the cover plate assembly 110 is less likely to melt than the portion located within the gap between the two cover plate assemblies 110. This will not only reduce the overall structural strength of the current collecting component 200, but also fail to achieve the desired melting effect of the longer weak section 210.

[0088] In some embodiments, the current collecting member 200 may further include a plurality of connecting segments 220 . The connecting segments 220 are connected to the cover plate assembly 110 , and the weak segment 210 is located between two adjacent connecting segments 220 .

[0089] In some examples, each connecting segment 220 is connected to one cover plate assembly 110 , and the weak segment 210 is located between two adjacent connecting segments 220 .

[0090] In this way, by disposing the weak section 210 between two adjacent connecting sections 220 , the connecting sections 220 are connected to the sides of the current collecting member 200 , so that the current collecting member 200 can achieve the function of connecting the plurality of cover plate assemblies 110 .

[0091] refer to Figure 4 In some embodiments, along the thickness direction of the cover plate assembly 110 (eg Figure 4 As shown by the arrow Y in FIG4 ), the height of the weak section 210 (as shown by the height H3 in FIG4 ) is less than the height of the connecting section 220 (as shown by the arrow Y in FIG4 ). Figure 4 As shown in the height H1 in FIG, the flow area of ​​the weak section 210 can be reduced.

[0092] In this way, along the height direction of the cover assembly 110, by making the height H3 of the weak section 210 smaller than the height H1 of the connecting section 220, the cross-sectional area of ​​the weak section 210 can be made smaller relative to the cross-sectional area of ​​the connecting section 220, and the resistance of the weak section 210 can be made larger. When thermal runaway occurs in the battery cell unit 100, the weak section 210 is more likely to melt, thereby achieving the effect of melting protection.

[0093] refer to Figure 4 In some embodiments, the ratio of the height H3 of the weak section 210 to the height H1 of the connecting section 220 is greater than or equal to 0.2 and less than or equal to 0.8. For example, the ratio of the height H3 of the weak section 210 to the height H1 of the connecting section 220 can be one of 0.3, 0.4, 0.5, and 0.67. In one example, the ratio of the height H3 of the weak section 210 to the height H1 of the connecting section 220 is greater than or equal to 0.3 and less than or equal to 0.5.

[0094] In this way, if the ratio of the height H3 of the weak section 210 to the height H1 of the connecting section 220 is greater than or equal to 0.8, the difference between the cross-sectional area of ​​the weak section 210 and the cross-sectional area of ​​the connecting section 220 will be smaller, which will in turn cause the current flow capacity of the weak section 210 and the current flow capacity of the connecting section 220 to be almost the same, which is not conducive to achieving the effect of high-temperature melting of the weak section 210 and the connecting section 220 first, that is, the melting protection effect of the weak section 210 is poor.

[0095] If the ratio of the height H3 of the weak section 210 to the height H1 of the connecting section 220 is less than or equal to 0.2, the cross-sectional area of ​​the weak section 210 will be too small, resulting in too low a structural strength of the weak section 210, and further resulting in a low overall structural strength of the current collecting component 200, which will easily cause damage to the current collecting component 200.

[0096] refer to Figure 4 and Figure 5 The height of the current collecting member 200 is H1, the thickness of the current collecting member 200 is L0, the current carrying capacity of the electrode core is A, and the current carrying coefficient is K: L0, H1, A and K satisfy: L0×H1×K≥A.

[0097] In this way, the current collecting member 200 can meet the flow requirement between two adjacent battery cells 100 , avoiding excessive power loss due to a small flow area of ​​the current collecting member 200 , and ensuring the working performance of the battery assembly 10 .

[0098] In some embodiments, the current carrying coefficient K is affected by the heat dissipation environment, material, etc. When the material is copper, 4.5≤K≤15; when the material is aluminum, the recommended coefficient is 3≤K≤10.

[0099] refer to Figure 5 In a specific implementation, the thickness L0 of the current collecting member 200 is greater than or equal to 0.6 mm and less than or equal to 3 mm. For example, the thickness L0 of the current collecting member 200 can be one of 0.6 mm, 0.7 mm, 1 mm, 1.6 mm, and 2.7 mm.

[0100] Thus, if the thickness L0 of the current collecting member 200 is less than 0.6 mm, the probability of the current collecting member 200 being broken or damaged due to its low structural strength increases. If the thickness L0 of the current collecting member 200 is greater than 3 mm, it is difficult to weld through the current collecting member 200 when welding the current collecting member 200 to the cap plate assembly 110 using a laser penetration welding process, thereby reducing the weldability of the current collecting member 200.

[0101] In some embodiments, in a direction perpendicular to the thickness of the current collecting member 200, the current collecting member 200 is located between the surface where the cover assembly 110 is connected to the current collecting member 200 and the outer edge of the shell 120 of the battery cell unit 100, thereby preventing the current collecting member 200 from protruding from the side surface of the shell 120 of the battery cell unit 100 and preventing the current collecting member 200 from occupying the space in the horizontal direction of the battery cell unit 100.

[0102] refer to Figure 4 In some embodiments, along a first direction (e.g. Figure 4 As shown by the arrow x in FIG), the maximum distance between the cover plate assemblies 110 on the two outermost battery cell units 100 (as shown in FIG Figure 4 ) is greater than the length of the current collecting member 200 (as shown in L4 in FIG. Figure 4 L3 in Figure 1).

[0103] In this way, along the first direction, the maximum distance L4 between the cover assemblies 110 on the two outermost battery cell units 100 among the multiple battery cell units 100 is greater than the length L3 of the current collecting component 200, which can avoid the waste of material of the current collecting component 200 due to the excessive length L3 of the current collecting component 200, reduce the manufacturing cost of the current collecting component 200, and reduce the manufacturing cost of the battery assembly 10.

[0104] The present invention also provides a battery pack, which may include the battery assembly 10. The battery pack provided by the present invention can reduce the height of the battery pack and thus reduce the space occupied by the battery pack by using the battery assembly 10.

[0105] The present application also provides an electric device, which may include an electric device and a battery pack. The battery uses the battery pack described above, and the battery pack is used to provide power to the electric device.

[0106] An embodiment of the present application provides an electrical device. By installing a battery pack in the electrical device, the space occupied by the battery pack in the electrical device can be reduced, so that more space in the electrical device is available for installing other structural components.

[0107] In some embodiments, the electrical equipment can be a vehicle or an energy storage device. The vehicle can be an electric vehicle / equipment (Electric Vehicle, referred to as EV), a pure electric vehicle equipment (Pure Electric Vehicle / Battery Electric Vehicle, referred to as PEV / BEV), a hybrid electric vehicle (Hybrid Electric Vehicle, referred to as HEV), a range extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), or a new energy vehicle (New Energy Vehicle).

[0108] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0109] It should be noted that phrases such as "in a specific implementation," "in some embodiments," "in this embodiment," and "exemplarily" mentioned in the specification indicate that the described embodiment may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0110] Generally speaking, terms should be understood, at least in part, based on the context in which they are used. For example, as used herein, the term "one or more" can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense, depending at least in part on the context. Similarly, terms such as "a," "an," or "the" can also be understood to convey either singular or plural usage, depending at least in part on the context.

[0111] It should be readily understood that “on,” “above,” and “over” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0112] Additionally, spatially relative terms, such as "below," "beneath," "beneath," "above," and the like, may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be in other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery assembly (10), characterized in that: include: A plurality of battery core units (100), wherein the plurality of battery core units (100) are arranged along a first direction, Each of the battery cell units (100) comprises a cover plate assembly (110) and a pole core, one end of the pole core has a pole lug, and the cover plate assembly (110) is used for being electrically connected to the pole lug; a current collecting member (200), the current collecting member (200) extending along the first direction, the current collecting member (200) being electrically connected to the cover plate assembly (110) of the plurality of battery cell units (100); Along the thickness direction of the cover plate assembly (110), the top surface of the current collecting component (200) is not higher than the top surface of any of the cover plate assemblies (110).

2. The battery assembly (10) according to claim 1, characterized in that A height difference between a top surface of the cover plate assembly (110) and a top surface of the current collecting member (200) is greater than or equal to 0 mm and less than or equal to 3 mm.

3. The battery assembly (10) according to claim 1, characterized in that The cover plate assembly (110) comprises: A cover plate body (111), wherein the cover plate body (111) is electrically connected to the pole lug of the pole core, a portion of the cover plate body (111) is exposed at the end face of the pole core, and in the thickness direction of the cover plate body (111), the height of the exposed portion of the cover plate body (111) is greater than or equal to 0.5 mm and less than or equal to 8 mm.

4. The battery assembly (10) according to claim 1, characterized in that The current collecting component (200) is located on one side of the cover plate assembly (110) and is electrically connected to the side surfaces of each cover plate assembly (110).

5. The battery assembly (10) according to claim 1, characterized in that The current collecting component (200) comprises: At least one weak section (210), along the first direction, the weak section (210) is located in the interval between two adjacent cover plate assemblies (110).

6. The battery assembly (10) according to claim 5, characterized in that The length of the weak section (210) is less than the maximum spacing distance between two adjacent cover plate assemblies (110).

7. The battery assembly (10) according to claim 5, characterized in that The current collecting component (200) further comprises a plurality of connecting sections (220), wherein the connecting sections (220) are connected to the cover plate assembly (110), and the weak section (210) is located between two adjacent connecting sections (220).

8. The battery assembly (10) according to claim 7, characterized in that Along the thickness direction of the cover plate assembly (110), the height of the weak section (210) is smaller than the height of the connecting section (220).

9. The battery assembly (10) according to claim 7, characterized in that The ratio of the height of the weak section (210) to the height of the connecting section (220) is greater than or equal to 0.2 and less than or equal to 0.

8.

10. The battery assembly (10) according to any one of claims 1 to 9, characterized in that: Along the first direction, the maximum distance between the cover plate assemblies (110) on the two outermost battery cell units (100) is greater than the length of the current collecting member (200).

11. The battery assembly (10) according to any one of claims 1 to 9, characterized in that: The height of the current collecting component (200) is H1, the thickness of the current collecting component (200) is L0, the current carrying capacity of the pole core is A, and the current carrying coefficient is K: The L0, H1, A and K satisfy: L0×H1×K≥A.

12. The battery assembly (10) according to claim 11, characterized in that The thickness of the current collecting component (200) is greater than or equal to 0.6 mm and less than or equal to 3 mm.

13. A battery pack, characterized in that: A battery assembly (10) comprising any one of claims 1 to 12.

14. An electrical device, characterized in that: Including electrical devices and battery packs; The battery is the battery pack as claimed in claim 13, and the battery pack is used to provide electrical energy to the electrical device.

Images