Battery assembly, battery pack and electrical device

Abstract

The present application relates to the technical field of batteries, and provides a battery assembly, a battery pack, and an electrical device. In the battery assembly, a plurality of battery cell units are arranged in a first direction; each battery cell unit comprises a cover plate assembly and an electrode core, one end of the electrode core being provided with a tab, and the cover plate assembly being used for electrically connecting to the tab; a current collecting member extends in the first direction, and is electrically connected to the cover plate assemblies of the plurality of battery cell units; and in the thickness direction of the cover plate assemblies, the top surface of the current collecting member is not higher than the top surface of any cover plate assembly. The battery assembly provided in the embodiments of the present application prevents the current collecting member from further increasing the height of the battery assembly, reduces a relatively large space occupied by the battery assembly in the height direction, reduces the volume of an assembled battery pack, and can reduce the space occupancy rate of the battery pack in an electrical device.

Description

Battery assembly, battery pack and electric device

[0001] The present disclosure claims priority to the Chinese patent application No. 202422339157.9, filed on September 24, 2024, and entitled "Battery assembly, battery pack and electric device", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular to a battery assembly, a battery pack and an electric device. BACKGROUND

[0003] The battery pack generally includes a plurality of single cell units, each cell unit includes a cover plate assembly, and each cover plate assembly can be electrically connected through a busbar, and the finally formed battery pack can be used to provide electric energy for an electric device.

[0004] However, the battery assembly in the above related technology occupies a large space in the height direction, thereby causing the volume of the assembled battery pack to be large, and causing the battery pack to occupy a large space of the electric device. SUMMARY

[0005] The present application provides a battery assembly, a battery pack and an electric device, which are used to solve the technical problem that the battery assembly in the above related technology occupies a large space in the height direction, thereby causing the volume of the assembled battery pack to be large, and causing the battery pack to occupy a large space of the electric device.

[0006] In order to achieve the above purpose, the embodiments of the present application provide the following technical solutions:

[0007] The first aspect of the embodiments of the present application provides a battery assembly, which comprises:

[0008] a plurality of cell units, the plurality of cell units are arranged along a first direction,

[0009] each cell unit comprises a cover plate assembly and a pole core, one end of the pole core has a tab, and the cover plate assembly is used to electrically connect with the tab;

[0010] a current collecting member, the current collecting member extends along the first direction, and the current collecting member is electrically connected with the cover plate assembly of the plurality of cell units;

[0011] In 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 cover plate assembly.

[0012] The battery assembly provided by the embodiments of the present application electrically connects the plurality of cell units in the battery assembly by using the current collecting member to electrically connect the cover plate assemblies arranged on each pole core. In the thickness direction of the cover plate assembly, by making the top surface of the current collecting member not higher than the top surface of any cover plate assembly, compared with the arrangement mode of arranging the current collecting member on the top surface of the cover plate assembly in the prior art, the current collecting member can avoid further increasing the height of the battery assembly, reduce the space occupied by the battery assembly in the height direction, reduce the volume of the assembled battery pack, and can reduce the space occupancy rate of the battery pack in the electrical equipment.

[0013] Based on the above technical solutions, the present application can also be improved as follows.

[0014] In a possible implementation, the height difference between the top surface of the cover plate assembly and the top surface of the current collecting member is greater than or equal to 0 mm and less than or equal to 3 mm.

[0015] In this way, by making the height difference between the top surface of the cover 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 cover plate assembly, and the height of the battery assembly can be prevented from being increased by the current collecting member.

[0016] If the height difference between the top surface of the cover plate assembly and the current collecting member is greater than 3 mm, in order to ensure that the current collecting member has sufficient welding area with the cover plate assembly, there will be more parts on the cover plate assembly that are not used for two current collecting members, which leads to low space utilization of the cover plate assembly and increases the height of the cell unit, resulting in large space occupation of the battery assembly in the height direction.

[0017] In a possible implementation, the cover plate assembly comprises:

[0018] The cover plate body is electrically connected with the tab of the pole core, and part of the cover plate body is exposed on the end surface of the pole core. In the thickness direction of the cover plate body, the height of the exposed part of the cover plate body is greater than or equal to 0.5 mm and less than or equal to 8 mm.

[0019] In this way, if the height of the exposed part of the cover plate body is less than 0.5 mm, the connection area between the cover plate body and the current collecting member will be small, which reduces the connection stability between the current collecting member and the cover plate body, and the current passing ability at the connection between the current collecting member and the cover plate body will be poor, which increases the heat generation and causes the loss of electric energy.

[0020] If the height of the exposed part of the cover plate body is greater than 8 mm, on the one hand, the cover plate body will be wasted, which increases the manufacturing cost of the battery assembly, and on the other hand, the height of the cover plate body in the height direction of the cell unit will be too large, which increases the space occupancy rate of the battery assembly in the height direction.

[0021] In a possible implementation, the current collecting member is located at one side of the cover plate assembly and is electrically connected to the side surface of each cover plate assembly.

[0022] In this way, by arranging the current collecting member at 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.

[0023] In a possible implementation, the current collecting member comprises:

[0024] At least one weak section, which is located in the interval between the two adjacent cover plate assemblies in the first direction.

[0025] In this way, by arranging the weak section in the interval between the two adjacent cover plate assemblies, the weak section is more likely to be broken by high-temperature melting than other parts of the current collecting member, thereby avoiding further thermal runaway by breaking the weak section closest to the battery cell unit that has thermal runaway.

[0026] In a possible implementation, the length of the weak section is less than the maximum interval distance between the two adjacent cover plate assemblies.

[0027] In this way, by making the length of the weak section less than the maximum interval distance between the two adjacent cover plate assemblies, on the one hand, the battery cell units 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, the weak section is connected to the side of the cover plate assembly, the part of the weak section connected to the cover plate assembly is less likely to be melted than the part located in the interval between the two cover plate assemblies, which not only reduces the overall structural strength of the current collecting member, but also fails to achieve the melting effect of the long weak section.

[0028] In a possible implementation, the current collecting member further comprises a plurality of connecting sections, the connecting sections connect the cover plate assemblies, and the weak section is located between two adjacent connecting sections.

[0029] In this way, by arranging the weak section between the two adjacent connecting sections, the connecting sections are connected to the side of the current collecting member to realize the function of connecting the plurality of cover plate assemblies.

[0030] In a possible implementation, in the thickness direction of the cover plate assembly, the height of the weak section is less than the height of the connecting section.

[0031] In this way, along the height direction of the cover plate 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, so that the weak section is more likely to melt when the battery cell unit experiences thermal runaway, thereby achieving the effect of melting protection.

[0032] In a possible implementation, the 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.

[0033] 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 cross-sectional area of the weak section will be less different from the cross-sectional area of the connecting section, and the current overcurrent capacity of the weak section will be similar to the current overcurrent capacity of the connecting section, which is not conducive to the effect of the weak section melting first and the connecting section melting at high temperature, that is, the melting protection effect of the weak section is poor.

[0034] If the ratio of the height of the weak section to the height of the connecting section is less than or equal to 0.2, the cross-sectional area of the weak section will be too small, the structural strength of the weak section will be too low, and the overall structural strength of the current collecting member will be low, and the current collecting member is prone to damage.

[0035] In a possible implementation, along the first direction, the maximum distance between the cover plate assemblies on the two outermost battery cell units is greater than the length of the current collecting member.

[0036] In this way, along the first direction, by making the maximum distance between the cover plate assemblies on the two outermost battery cell units greater than the length of the current collecting member, the material waste of the current collecting member caused by the length of the current collecting member being too long can be avoided, the manufacturing cost of the current collecting member can be reduced, and the manufacturing cost of the battery assembly can be reduced.

[0037] 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 pole core is A, and the current carrying coefficient is K:

[0038] L0, H1, A, and K satisfy: L0x H1x K≥A.

[0039] In this way, the current collecting member can meet the overcurrent requirement between the two adjacent battery cell units, the excessive loss of electrical energy caused by the overcurrent area of the current collecting member being too small can be avoided, and the working performance of the battery assembly can be ensured.

[0040] 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.

[0041] In this way, if the thickness of the current collecting member is less than 0.6 mm, the probability of the current collecting member being damaged due to the low structural strength of the current collecting member is increased. If the thickness of the current collecting member is greater than 3 mm, the current collecting member is not easy to be penetrated when the current collecting member is welded to the cover assembly by using a laser penetration welding process, thereby reducing the weldability of the current collecting member.

[0042] A second aspect of the embodiments of the present application provides a battery pack comprising the battery assembly.

[0043] The battery pack provided by the embodiments of the present application can reduce the height of the battery pack and further reduce the space occupancy of the battery pack by using the battery assembly.

[0044] A third aspect of the embodiments of the present application provides an electrical equipment comprising an electrical device and a battery pack.

[0045] The battery adopts the battery pack as described above, and the battery pack is used to provide electrical energy for the electrical device.

[0046] The electrical equipment provided by the embodiments of the present application can reduce the space occupancy of the battery pack in the electrical device by installing the battery pack in the electrical device, so that more space is provided in the electrical equipment for installing other structural members. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0048] FIG. 1 is a structural schematic diagram of a first battery assembly provided by the embodiments of the present application;

[0049] FIG. 2 is a structural schematic diagram of a second battery assembly provided by the embodiments of the present application;

[0050] FIG. 3 is a structural schematic diagram of another view of a battery assembly provided by the embodiments of the present application;

[0051] FIG. 4 is a partial structural schematic diagram of A in FIG. 1;

[0052] FIG. 5 is a partial structural schematic diagram of B in FIG. 3;

[0053] FIG. 6 is a structural schematic diagram of a cover assembly of a cell unit of a battery assembly provided by the embodiments of the present application;

[0054] FIG. 7 is a structural schematic diagram of a battery pack provided by the embodiments of the present application;

[0055] FIG. 8 is a structural schematic diagram of an electric device provided by an embodiment of the present application.

[0056] Label explanation: 10-battery assembly; 100-cell unit; 110- cover plate assembly; 120-housing; 111-cover plate body; 112-insulating ring; 113-metal ring; 200-current collecting member; 210-weak section; 220-connection section; 230-groove; 20-battery pack; 1000-electric device. DETAILED DESCRIPTION

[0057] As described in the background, the battery assembly in the related art occupies a large space in the height direction, thereby resulting in a large volume of the assembled battery pack and a large space occupied by the battery pack in the electric device.

[0058] In view of the above technical problems, the present application provides a battery assembly, a battery pack and an electric device. The cover plate assemblies arranged on each pole core are electrically connected by using the current collecting member, thereby electrically connecting the plurality of cell units in the battery assembly. In 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 cover plate assembly, compared with the setting mode of the prior art in which the current collecting member is arranged on the top surface of the cover plate assembly, the height of the battery assembly is not further increased, the battery assembly occupies a small space in the height direction, the volume of the assembled battery pack is reduced, and the space occupied by the battery pack in the electric device is reduced.

[0059] 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 described clearly and completely below with reference to 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. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0060] Referring to FIGS. 1, 2 and 3, the present application provides a battery assembly 10, which can include a plurality of cell units 100 and a current collecting member 200.

[0061] The plurality of cell units 100 are arranged along a first direction (as shown by arrow x in FIG. 1). It can be understood that the first direction can be the thickness direction of the cell unit 100 as shown in FIG. 1. In another embodiment, the first direction can also be the width direction of the cell unit 100.

[0062] Each of the battery cell units 100 can include a cover plate assembly 110 and a pole core having a tab at least one end of the pole core, and the cover plate assembly 110 is configured to be electrically connected with the tab.

[0063] The battery cell unit 100 can further include a housing 120 in which the pole core is disposed, the housing 120 having an opening, and the cover plate assembly 110 is configured to be disposed on the opening of the housing 120 and electrically connected with the tab of the pole core at an end of the pole core facing the opening.

[0064] The current collecting member 200 is configured to extend along the arrangement direction of the plurality of battery cell units 100, for example, the current collecting member 200 extends along the first direction, and the current collecting member 200 is electrically connected with the cover plate assemblies 110 of the plurality of battery cell units 100. In some embodiments, the current collecting member 200 is configured to be welded with the cover plate assemblies 110 by welding.

[0065] In a specific implementation, the current collecting member 200 is welded with the cover plate assemblies 110 by using a laser penetration welding process.

[0066] In the thickness direction of the cover plate assembly 110 (as shown by the arrow Y in FIG. 1), the top surface of the current collecting member 200 is not higher than the top surface of any of the cover plate assemblies 110, so that the part of the current collecting member 200 that is higher than the top surface of the cover plate assembly 110 does not increase the height of the battery cell unit 100.

[0067] The embodiments of the present application provide a battery assembly 10, in which the cover plate assemblies 110 disposed on each of the pole cores are electrically connected by using the current collecting member 200, thereby electrically connecting the plurality of battery cell units 100 in the battery assembly 10. In the thickness direction of the cover plate assembly 110, by making the top surface of the current collecting member 200 not higher than the top surface of any of the cover plate assemblies 110, compared with the setting mode in the prior art in which the current collecting member 200 is disposed on the top surface of the cover plate assembly 110, the height of the battery assembly 10 is not further increased by the current collecting member 200, the battery assembly 10 occupies less space in the height direction, the volume of the assembled battery pack is reduced, and the space occupancy rate of the battery pack in the electrical equipment is reduced.

[0068] Referring to FIG. 4, in some embodiments, the height difference (as shown by the height difference M in FIG. 4) between the top surface of the cover plate assembly 110 and the top surface of the current collecting member 200 is greater than or equal to 0 mm and less than or equal to 3 mm. 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 can be one of 0 mm, 1 mm, 1.5 mm, 2 mm, and 2.7 mm.

[0069] In this way, by making the height difference M between the top surface of the cover 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 cover plate assembly 110, and the current collecting member 200 can be prevented from increasing the height of the battery assembly 10.

[0070] If the height difference M between the top surface of the cover plate assembly 110 and the current collecting member 200 is greater than 3 mm, in order to ensure that the current collecting member 200 and the cover plate assembly 110 have sufficient welding area, there will be more parts on the cover plate assembly 110 that are not used for welding the current collecting member 200, which will result in lower space utilization of the cover plate assembly 110 and increase 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 member 200 is less than or equal to 3 mm.

[0071] Referring to FIGS. 4 and 5, in one possible implementation, the cover plate assembly 110 can include a cover plate body 111. The cover plate body 111 is electrically connected to the tab of the pole core, and a portion of the cover plate body 111 is exposed on the end surface of the pole core. In the thickness direction of the cover plate body 111, the height (indicated by height H2 in FIG. 4) 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. For example, the height of the exposed portion of the cover plate body 111 can be one of 0.8 mm, 3 mm, 5 mm, 6.5 mm, and 7 mm. It can be understood that the exposed portion is a portion that can be directly observed by an operator.

[0072] In this way, if the height H2 of the exposed portion of the cover plate body 111 is less than 0.5 mm, the connection area between the cover plate body 111 and the current collecting member 200 will be small, which will result in reduced connection stability between the current collecting member 200 and the cover plate body 111, and will result in poor current passing ability at the connection between the current collecting member 200 and the cover plate body 111, which will increase the amount of heat generated and cause a loss of electrical energy.

[0073] If the height H2 of the exposed portion of the cover plate body 111 is greater than 8 mm, on the one hand, it will result in waste of the cover plate body 111 and increase the manufacturing cost of the battery assembly 10, and on the other hand, it will result in excessive height of the cover plate body 111 in the height direction of the battery cell unit 100 (indicated by arrow Y in FIG. 4), which will increase the space occupation rate of the battery assembly 10 in the height direction. Therefore, the height (indicated by height H2 in FIG. 4) of the exposed portion of the cover plate body 111 is less than or equal to 8 mm.

[0074] Referring to FIG. 6, in some embodiments, the cover plate assembly 110 can further include an insulating ring 112 and a metal ring 113 disposed outside the insulating ring 112, and the insulating ring 112 is welded to the shell 120 of the battery cell unit 100 through the metal ring 113. The insulating ring 112 has a through hole, and the cover plate body 111 is disposed on the insulating ring 112, and the part of the cover plate body 111 located in the through hole is electrically connected to the tab on the pole core, and the other part of the cover plate body 111 is exposed outside the insulating ring 112, and the surface of the part of the cover plate body 111 exposed outside is connected to the current collecting member 200.

[0075] In an exemplary embodiment, in the direction perpendicular to the side surface of the current collecting member 200 connected to the cover plate body 111, there is a gap between the side surface of the cover plate body 111 and the side surface of the insulating ring 112, and the current collecting member 200 is located in the gap, so that the current collecting member 200 can be prevented from protruding from the side surface of the insulating ring 112.

[0076] In some embodiments, the cover plate body 111 can be prepared by stamping forming, and the material of the cover plate body 111 can be aluminum, steel, copper-aluminum composite material, steel-aluminum composite material, steel-nickel plated material, or copper-nickel plated material. The cover plate body 111 does not react with the electrolyte. The material of the insulating ring 112 can be ceramic, polyphenylene sulfide (PPS) injection material, or glass.

[0077] Referring to FIGS. 4 and 5, in a 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 surface 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.

[0078] In this way, by arranging the current collecting member 200 on the side of the cover 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.

[0079] Referring to FIGS. 4 and 5, in some embodiments, the current collecting member 200 can include at least one weak section 210, and the weak section 210 is located at the gap between two adjacent cover plate assemblies 110 in the first direction. It can be understood that when each region on the current collecting member 200 is in the same environment, the weak section 210 is more likely to be fused than other regions on the current collecting member 200, because the overcurrent capacity of the weak section 210 is lower than that of other regions on the current collecting member 200, so that the resistance of the weak section 210 is higher and more likely to heat.

[0080] In this way, by arranging the weak section 210 at the interval between the two adjacent cover plate assemblies 110, the weak section 210 is more likely to be broken by high temperature melting than other parts on the current collecting member 200, so that when the battery cell unit 100 is in thermal runaway, the weak section 210 closest to the malfunctioning battery cell unit 100 can be broken, thereby avoiding further thermal runaway.

[0081] In an example, in the arrangement direction of the battery cell unit 100, if the battery cell unit 100 has two, the weak section 210 can have one, and the weak section 210 is located between the two cover plate assemblies 110 on the two battery cell units 100. If the battery cell unit 100 has n, the number of weak sections 210 can be n-1. So that there is one weak section 210 between the two cover plate assemblies 110 of each adjacent two battery cell units 100.

[0082] Referring to FIGS. 1 and 2, in some embodiments, by opening a groove 230 on the current collecting member 200 in the region between the two adjacent cover plate assemblies 110, the remaining part of the current collecting member 200 in this region serves as the weak section 210. In the thickness direction of the cover plate, the slot of the groove 230 can be as shown in FIG. 1, facing the top surface of the cover plate assembly 110. Alternatively, the slot of the groove 230 can be as shown in FIG. 2, facing away from the top surface of the cover plate assembly 110.

[0083] Referring to FIG. 4, in some embodiments, the length of the weak section 210 (as shown by length L1 in FIG. 4) is less than the maximum interval distance (as shown by length L2 in FIG. 4) between the two adjacent cover plate assemblies 110.

[0084] In this way, by making the length L1 of the weak section 210 less than the maximum interval distance L2 between the two adjacent cover plate assemblies 110, on the one hand, it can ensure that the two cover plate assemblies 110 corresponding battery cell units 100 are disconnected when the weak section 210 is melted. If the weak section 210 is too long, for example, the weak section 210 is connected to the side of the cover plate assembly 110, the part of the weak section 210 connected to the cover plate assembly 110 is less likely to be melted than the part located in the interval between the two cover plate assemblies 110. Not only will it reduce the overall structural strength of the current collecting member 200, but it will also not achieve the preset melting effect of the longer weak section 210.

[0085] In some embodiments, the current collecting member 200 can further include a plurality of connecting sections 220, the connecting sections 220 connecting the cover plate assemblies 110, and the weak section 210 being located between the two adjacent connecting sections 220.

[0086] In some examples, each connecting section 220 connects one cover plate assembly 110, and the weak section 210 is located between the two adjacent connecting sections 220. In some examples, each connecting section 220 connects one cover plate assembly 110, and the weak section 210 is located between the two adjacent connecting sections 220. In some examples, each connecting section 220 connects one cover plate assembly 110, and the weak section 210 is located between the two adjacent connecting sections 220. In some examples, each connecting section 220 connects one cover plate assembly 110, and the weak section 210 is located between the two adjacent connecting sections 220. In some examples, each connecting section 220 connects one cover plate assembly 110, and the weak section 210 is located between the two adjacent connecting sections 220. 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[0087] In this way, by placing the weak section 210 between two adjacent connecting sections 220, and connecting sections 220 being connected to the side of the flow collecting member 200, the flow collecting member 200 can be used to connect multiple cover plate assemblies 110.

[0088] Referring to Figure 4, in some embodiments, along the thickness direction of the cover plate assembly 110 (as shown by arrow Y in Figure 4), the height of the weak section 210 (as shown by height H3 in Figure 4) is less than the height of the connecting section 220 (as shown by height H1 in Figure 4), thereby enabling a reduction in the flow area of ​​the weak section 210.

[0089] In this way, by making the height H3 of the weak section 210 smaller than the height H1 of the connecting section 220 along the height direction of the cover plate assembly 110, the cross-sectional area of ​​the weak section 210 can be smaller than that of the connecting section 220, and the resistance of the weak section 210 can be larger. When the cell unit 100 experiences thermal runaway, the weak section 210 is more likely to melt, thereby achieving the effect of melt protection.

[0090] Referring to Figure 4, in some embodiments, the ratio of the height H3 of the weak segment 210 to the height H1 of the connecting segment 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 segment 210 to the height H1 of the connecting segment 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 segment 210 to the height H1 of the connecting segment 220 is greater than or equal to 0.3 and less than or equal to 0.5.

[0091] Thus, 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 small. Consequently, the current carrying capacity of the weak section 210 will be almost the same as that of the connecting section 220, which is not conducive to the realization of 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.

[0092] 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 low structural strength of the weak section 210. Consequently, the overall structural strength of the current collection component 200 will be low, and the current collection component 200 will be prone to damage.

[0093] Referring to Figures 4 and 5, the height of the current collector 200 is H1, the thickness of the current collector 200 is L0, the current carrying capacity of the core is A, and the current carrying coefficient is K: L0, H1, A and K satisfy the following: L0×H1×K≥A.

[0094] In this way, the current collecting member 200 can meet the current flow requirement between two adjacent battery cell units 100, avoid excessive loss of electrical energy due to too small current flow area of the current collecting member 200, and ensure the working performance of the battery assembly 10.

[0095] 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; and when the material is aluminum, the recommended coefficient is 3≤K≤10.

[0096] Referring to FIG. 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.

[0097] In this way, if the thickness L0 of the current collecting member 200 is less than 0.6 mm, the probability of problems such as breakage and damage of the current collecting member 200 due to too low structural strength of the current collecting member 200 is increased. If the thickness L0 of the current collecting member 200 is greater than 3 mm, the current collecting member 200 is not easy to be welded through when the current collecting member 200 is welded to the cover plate assembly 110 using a laser penetration welding process, thereby reducing the weldability of the current collecting member 200.

[0098] In some embodiments, in a direction perpendicular to the thickness direction of the current collecting member 200, the current collecting member 200 is located between the surface of the cover plate assembly 110 connected to the current collecting member 200 and the outer edge of the shell 120 of the battery cell unit 100, thereby avoiding the current collecting member 200 protruding from the side surface of the shell 120 of the battery cell unit 100 and occupying the space in the horizontal direction of the battery cell unit 100.

[0099] Referring to FIG. 4, in some embodiments, along the first direction (as shown by the arrow x in FIG. 4), the maximum distance (as shown by L4 in FIG. 4) between the cover plate assemblies 110 on the two outermost battery cell units 100 is greater than the length (as shown by L3 in FIG. 4) of the current collecting member 200.

[0100] In this way, along the first direction, by making the maximum distance L4 between the cover plate assemblies 110 on the two outermost battery cell units 100 in the plurality of battery cell units 100 greater than the length L3 of the current collecting member 200, the material waste of the current collecting member 200 due to too long length L3 of the current collecting member 200 can be avoided, the manufacturing cost of the current collecting member 200 is reduced, and the manufacturing cost of the battery assembly 10 is reduced.

[0101] Referring to FIG. 7, the application also provides a battery pack 20, which can include the battery assembly 10 described above. The battery pack 20 provided by the application can reduce the height of the battery pack 20, and further reduce the space occupancy of the battery pack 20 by using the battery assembly 10 described above.

[0102] Referring to FIG. 8, the application also provides a power consuming device 1000, which can include a power consuming device and a battery pack. The battery uses the battery pack 20 described above, and the battery pack 20 is used to provide power for the power consuming device.

[0103] The application provides a power consuming device 1000, which can reduce the space occupancy of the battery pack 20 in the power consuming device by installing the battery pack 20 in the power consuming device, so as to have more space in the power consuming device for installing other structural members.

[0104] In some embodiments, the power consuming device can be a vehicle or a power storage device, and the vehicle can be an electric vehicle (EV), a pure electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), or a new energy vehicle.

[0105] Each embodiment or implementation in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between embodiments can be referred to each other.

[0106] It should be noted that the terms "in a specific implementation", "in some embodiments", "in the present embodiment", "exemplarily" and the like in the specification mean that the described embodiments can include specific features, structures or characteristics, but not necessarily every embodiment includes the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or characteristic is described in combination with an embodiment, it is within the knowledge of those skilled in the art to realize such feature, structure or characteristic in combination with other embodiments described explicitly or implicitly.

[0107] In general, terminology can be understood at least in part from usage in context. For example, terms, such as "one or more" as used herein, can be taken to describe any feature, structure, or characteristic in the singular or can be taken to describe a combination of features, structures or characteristics in the plural sense. Similarly, terms, such as "a" or "an," as used herein can be taken to convey a singular usage or a plural usage, depending at least in part on context.

[0108] It will be readily understood that the terms "on," "above," and "over," in the present disclosure, are to be interpreted in the broadest context possible so that "on" means not only "directly on" but also includes the meaning of "on" with intervening features or layers therebetween, and "above" or "over" includes not only the meaning of "above" or "over" but also can include the meaning of "above" or "over" without intervening features or layers therebetween (i.e., directly on).

[0109] In addition, spatially relative terms, such as "beneath", "below", "lower", "above", "upper", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0110] Finally, it should be noted that the above-described embodiments are merely intended to illustrate the technical solutions of the present application, but not to limit the same; even though the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above-described embodiments, or equivalently replace some or all of the technical features thereof; and such modifications or replacements do not cause the technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery assembly (10) characterized by, The battery assembly (10) comprises: a plurality of battery cell units (100), the plurality of battery cell units (100) being arranged along a first direction, each of the battery cell units (100) comprising a cover plate assembly (110) and a pole core, the pole core having a tab at one end, the cover plate assembly (110) being configured to electrically connect with the tab; a current collecting member (200) extending along the first direction, the current collecting member (200) being electrically connected with the cover plate assemblies (110) of the plurality of battery cell units (100); a top surface of the current collecting member (200) is not higher than a top surface of any of the cover plate assemblies (110) along a thickness direction of the cover plate assembly (110).

2. The battery assembly (10) according to claim 1, characterized in that A height difference between the top surface of the cover plate assembly (110) and the 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) of claim 1, characterized in that The cover plate assembly (110) comprises: a cover plate body (111) electrically connected with the tab of the pole core, a portion of the cover plate body (111) being exposed at an end surface of the pole core, and a height of the exposed portion of the cover plate body (111) along a thickness direction 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 any one of claims 1 to 3, characterized in that The current collecting member (200) is located at one side of the cover plate assembly (110) and is electrically connected with a side surface of each of the cover plate assemblies (110).

5. The battery assembly (10) according to any one of claims 1 to 3, characterized in that The current collecting member (200) comprises: at least one weak section (210) located within a space between two adjacent cover plate assemblies (110) along the first direction.

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

7. The battery assembly (10) of claim 5, characterized in that The current collecting member (200) further comprises a plurality of connecting sections (220) connecting the cover plate assemblies (110), the weak section (210) being located between two adjacent connecting sections (220).

8. The battery assembly (10) of claim 7, characterized in that A height of the weak section (210) along a thickness direction of the cover plate assembly (110) is less than a height of the connecting section (220).

9. The battery assembly (10) of claim 7, characterized in that A 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 A maximum distance between the cover plate assemblies (110) of two outermost battery cell units (100) along the first direction is greater than a length of the current collecting member (200).

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

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

13. The battery assembly (10) of claim 11, characterized by When a material of the current collecting member (200) is copper, 4.5≤K≤15; and when the material of the current collecting member (200) is aluminum, 3≤K≤10.

14. A battery pack (20) characterized by, The battery assembly (10) according to any one of claims 1 to 13.

15. An electric device (1000) characterized in that, including an electrical device and a battery pack; the battery employs the battery pack (20) as claimed in claim 14 for providing electrical energy to the electrical device.

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