Current collecting assembly, cover plate assembly, battery cell, battery pack and electric equipment

Abstract

The utility model discloses a current collecting assembly, a cover plate assembly, a battery cell, a battery pack and electric equipment, the current collecting assembly comprises a current collecting piece, and the current collecting piece comprises a first connecting part used for connecting a pole core; the second connecting part is used for connecting the electrode leading-out part; the fusible part is connected with the first connecting part and the second connecting part; the current over-current area of the first connecting part and the current over-current area of the second connecting part are greater than or equal to the current over-current area of the fusible part; the fusible part is provided with a first surface and a second surface which are opposite, and the first surface faces the pole core; the current collecting assembly further comprises a first insulating part, and the first insulating part covers the first surface of the fusible part. When the battery cell is subjected to external short circuit, the fusible part can be fused in time, so that a current loop between the positive electrode and the negative electrode in the battery cell is cut off, continuous short circuit of the battery cell is avoided, a heat production source of the battery cell is cut off, temperature rise is reduced, out-of-control of the battery cell caused by external short circuit is avoided, and the safety of the battery cell is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically to a current collecting assembly, a cover assembly, a battery cell, a battery pack and an electrical device. Background Art

[0002] The current collector is one of the important components of the battery, which is used to lead the electrical energy of the battery core out to the battery terminal.

[0003] In the related art, the current collector includes a pole welding area and a tab welding area, wherein the pole welding area is connected to the pole, and the tab welding area is connected to the tab. The pole welding area and the tab welding area are directly connected. When an external short circuit occurs in the battery, the current passing through the current collector inside the battery increases sharply, causing the battery to heat up rapidly and cause thermal runaway, which causes safety hazards.

[0004] In view of the above-mentioned technical problems, the present application provides a new assembly flow component, cover plate assembly, battery cell, battery pack and electrical equipment. Utility Model Content

[0005] The present application is proposed to solve at least one of the above problems. According to one aspect of the present application, a current collecting assembly is provided, comprising a current collecting piece, the current collecting piece comprising: a first connection portion for connecting the pole core; a second connection portion for connecting the electrode lead-out portion; at least one fusible portion, the fusible portion connecting the first connection portion and the second connection portion; wherein the current flow area of ​​the first connection portion and the current flow area of ​​the second connection portion are greater than the current flow area of ​​the fusible portion; the fusible portion has a first surface and a second surface opposite to each other, the first surface facing the pole core; the current collecting assembly also comprises a first insulating member, the first insulating member covering the first surface of the fusible portion.

[0006] In some embodiments of the present application, the current collecting part includes a circular plate body, on which at least two through holes arranged along the circumferential direction are provided, the portion of the circular plate body between two adjacent through holes forms the fusible part, the portion of the circular plate body located radially inside the fusible part forms the second connecting part, and the portion of the circular plate body located radially outside the fusible part forms the first connecting part.

[0007] In some embodiments of the present application, the first insulating member includes a body and at least one groove portion disposed in the body, and one of the fusible parts is correspondingly disposed in one of the groove portions.

[0008] In some embodiments of the present application, the main body includes at least two protrusions, one of the protrusions is correspondingly arranged in one of the through holes, and one of the grooves is provided between two adjacent protrusions.

[0009] In some embodiments of the present application, the first connecting portion is provided with an exhaust hole for exhausting gas in the battery cell.

[0010] In some embodiments of the present application, a connection hole for connecting a pole is provided in the second connection portion.

[0011] In some embodiments of the present application, the current flow area of ​​the fusible portion gradually decreases from the two ends of the fusible portion to the middle of the fusible portion.

[0012] In some embodiments of the present application, the current flow area at any end of the fusible portion is 1.5 to 4 times the minimum current flow area in the fusible portion.

[0013] In some embodiments of the present application, the length of the fusible portion is 2 mm to 5 mm.

[0014] In some embodiments of the present application, the inner contour of the first connecting portion is a first circular ring, the outer contour of the first insulating member is a second circular ring, the diameter of the first circular ring is smaller than the diameter of the second circular ring, and the difference between the diameters of the two is 0.5 mm to 2 mm.

[0015] According to another aspect of the present application, a cover plate assembly is provided, comprising: a cover plate; a current collecting assembly as described in any one of the above; and a pole connected to the second connecting portion of the current collecting member and passing through the cover plate to lead out an electrode.

[0016] In some embodiments of the present application, the cover plate assembly also includes a second insulating member, which is arranged between the cover plate and the fusible part of the current collector, the second surface of the fusible part faces the cover plate, and the second insulating member covers the second surface.

[0017] In some embodiments of the present application, a limiting protrusion is provided on the second insulating member, a limiting hole is provided on the first connecting portion of the current collecting member, and the limiting protrusion is arranged in the limiting hole so that the second insulating member and the current collecting member are limited to each other.

[0018] In some embodiments of the present application, the cover plate assembly also includes a sealing ring, a pole insulator and an electrical connector, the sealing ring is sleeved on the pole, the pole passes through the second insulating member, the cover plate and the pole insulator in sequence to connect to the electrical connector, and the electrical connector is used to electrically connect to the outside.

[0019] According to another aspect of the present application, a battery cell is provided, comprising: a shell having an opening; a pole core disposed in the shell; and a cover plate assembly as described above, wherein the first connecting portion of the current collecting member is connected to the pole core, and the cover plate assembly closes the opening.

[0020] According to another aspect of the present application, a battery pack is provided, comprising the battery cell.

[0021] According to another aspect of the present application, there is provided an electrical device, which includes the battery cell or the battery pack.

[0022] According to the current collecting assembly, cover assembly, battery cell, battery pack and electrical equipment of the embodiments of the present application, a fusible part is provided to connect the first connection part and the second connection part, the current flow area of ​​the first connection part and the current flow area of ​​the second connection part are larger than the current flow area of ​​the fusible part, and a first insulating part is provided to cover the first surface of the fusible part. When an external short circuit occurs in the battery cell, the fusible part can be blown in time, and the first insulating part can prevent the fusible part from contacting the pole core after blowing, thereby achieving insulation between the fusible part and the pole core, thereby cutting off the current loop between the positive and negative poles inside the battery cell, avoiding continuous short circuit of the battery cell, and cutting off the heat generation source of the battery cell, reducing temperature rise, avoiding external short circuit and causing battery cell out of control, and improving the safety of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0024] Figure 1 A schematic structural diagram of a current collecting assembly provided according to an embodiment of the present application is shown.

[0025] Figure 2 A schematic diagram showing the splicing welding of a second connecting portion and a pole according to an embodiment of the present application is shown.

[0026] Figure 3 A schematic structural diagram of a cover plate assembly provided according to an embodiment of the present application is shown.

[0027] Figure 4 A top view of a cover plate assembly provided according to an embodiment of the present application is shown.

[0028] In the attached figure:

[0029] 100 current collecting assembly;

[0030] 110 current collector;

[0031] 111 first connecting portion;

[0032] 1111 Exhaust hole;

[0033] 1112 limiting hole;

[0034] 112 second connection portion;

[0035] 1121 connection hole;

[0036] 113 fusible part;

[0037] 114 through hole;

[0038] 120 first insulating member;

[0039] 121 ontology;

[0040] 1212 convex part;

[0041] 122 groove part;

[0042] 200 cover assembly;

[0043] 210 Current collector;

[0044] 220 first insulating member;

[0045] 230 second insulating member;

[0046] 231 limiting protrusion;

[0047] 240 cover;

[0048] 250 poles;

[0049] 260 sealing ring;

[0050] 270 Pole insulation;

[0051] 280 Electrical connectors. DETAILED DESCRIPTION

[0052] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described.

[0053] It should be understood that the present application can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present application to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0054] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as a second element, component, region, layer or part.

[0055] Spatially relative terms such as "under," "below," "below," "under," "above," "above," etc., may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that in addition to the orientations shown in the figures, the spatially relative terms are intended to include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "on" the other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0056] In order to thoroughly understand the present application, a detailed structure will be presented in the following description to illustrate the technical solution proposed by the present application. The preferred embodiments of the present application are described in detail as follows, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0057] Reference below Figure 1A current collecting assembly 100 according to an embodiment of the present application is described. The current collecting assembly 100 provided in the embodiment of the present application includes a current collecting part 110, and the current collecting part 110 includes: a first connecting part 111, a second connecting part 112 and at least one fusible part 113; the first connecting part 111 is used to connect the pole core; the second connecting part 112 is used to connect the electrode lead-out part; the fusible part 113 connects the first connecting part 111 and the second connecting part 112; wherein the current flow area of ​​the first connecting part 111 and the current flow area of ​​the second connecting part 112 are greater than the current flow area of ​​the fusible part 113; the fusible part 113 has a first surface and a second surface opposite to each other, and the first surface faces the pole core; the current collecting assembly 100 also includes a first insulating part 120, and the first insulating part 120 covers the first surface of the fusible part 113.

[0058] Specifically, the first connection portion 111 of the current collector 110 is connected to the electrode core, the second connection portion 112 of the current collector 110 is connected to the electrode lead-out portion, and the first connection portion 111 and the second connection portion 112 are connected through the fusible portion 113. When an external short circuit occurs in the battery cell, the current flowing through the current collector 110 increases sharply. Since the current flow area of ​​the first connection portion 111 and the current flow area of ​​the second connection portion 112 are larger than the current flow area of ​​the fusible portion 113, the temperature rise rate of the fusible portion 113 is greater than the temperature rise rate of the first connection portion 111 or the second connection portion 112. When the temperature of the fusible portion 113 reaches a certain value, the fusible portion 113 is melted. And because the first insulating member 120 is provided to cover the first surface of the fusible part 113, the first insulating member 120 can prevent the fusible part 113 from contacting the pole core after it melts, thereby achieving insulation between the fusible part 113 and the pole core, thereby cutting off the current loop between the positive and negative poles inside the battery cell, avoiding continuous short circuit of the battery cell, and cutting off the heat generation source of the battery cell, reducing temperature rise, avoiding external short circuit causing battery cell loss of control, and improving the safety of the battery cell.

[0059] Based on this, the present application provides a current collecting assembly 100 that can improve the safety of the battery cell. According to the current collecting assembly 100 of the present application, by setting a fusible part 113 to connect the first connection part 111 and the second connection part 112, the current flow area of ​​the first connection part 111 and the current flow area of ​​the second connection part 112 are greater than the current flow area of ​​the fusible part 113, and a first insulating member 120 is set to cover the first surface of the fusible part 113. When an external short circuit occurs in the battery cell, the fusible part 113 can be blown in time, and the first insulating member 120 can prevent the fusible part 113 from contacting the pole core after the fusible part 113 is blown, so as to achieve insulation between the fusible part 113 and the pole core, thereby cutting off the current loop between the positive and negative poles inside the battery cell, avoiding continuous short circuit of the battery cell, and cutting off the heat generation source of the battery cell, reducing temperature rise, avoiding external short circuit and causing the battery cell to lose control, and improving the safety of the battery cell.

[0060] In some embodiments, the current collector 110 may be formed as a plate, a portion of the plate is a first connection portion 111 for electrically connecting to the pole core, a portion of the plate is a second connection portion 112 for connecting to the electrode lead-out portion, and the portion between the first connection portion 111 and the second connection portion 112 may be formed into a fusible portion 113 by thinning or punching a through hole. Of course, the present application does not exclude other connection methods.

[0061] In some embodiments, Figure 1 As shown, the current collecting part 110 includes a circular plate body, on which at least two through holes 114 arranged along the circumferential direction are provided, a portion of the circular plate body between two adjacent through holes 114 forms a fusible portion 113, a portion of the circular plate body located radially inside the fusible portion 113 forms a second connecting portion 112, and a portion of the circular plate body located radially outside the fusible portion 113 forms a first connecting portion 111.

[0062] Specifically, at least two through holes 114 arranged in the circumferential direction and the fusible part 113 between two adjacent through holes 114 can form a hollow ring, the portion of the circular plate body located radially inside the hollow ring forms the second connection part 112, the outer contour of the second connection part 112 is in the shape of a circular ring, the portion of the circular plate body located radially outside the hollow ring forms the first connection part 111, and the inner contour of the first connection part 111 is in the shape of a circular ring. The second connection part 112, the fusible part 113 and the first connection part 111 are sequentially arranged from inside to outside along the radial direction of the circular plate body.

[0063] In some embodiments, Figure 1 As shown, the first connection portion 111 may be annular, and the first connection portion 111 may be electrically connected to the pole core by welding. Of course, the present application does not exclude other connection methods.

[0064] Specifically, the first connection portion 111 may be electrically connected to the tab.

[0065] In some embodiments, Figure 1 As shown, the first connecting portion 111 is provided with an exhaust hole 1111 for exhausting the gas in the battery cell.

[0066] Exemplarily, the exhaust hole 1111 may be disposed at the outer edge of the first connecting portion 111 , and the number of the exhaust hole 1111 may be one or more. The exhaust hole 1111 may increase the exhaust path to exhaust the gas inside the battery cell.

[0067] In addition, the exhaust hole 1111 can also be a flexible hole. The first connecting part 111 can be divided into multiple areas by the exhaust hole 1111 arranged thereon. Flexible connection is achieved between the various areas through the flexible holes, and the various areas are independent of each other, which is beneficial to the fitting between the various areas on the first connecting part 111 and the pole core, and can reduce the gap between the two fitting surfaces of the first connecting part 111 and the pole core, thereby improving the reliability of the connection.

[0068] In some embodiments, Figure 1 As shown, the second connection portion 112 may be annular, and the second connection portion 112 may be connected to the electrode lead portion by welding. The electrode lead portion may be a pole, or may be a shell of a battery cell, etc., which is not limited.

[0069] Take the connection between the second connecting portion 112 and the pole as an example. Figure 2 As shown, the annular second connection portion 112 can match the step of the pole 250 and be welded, reducing the space occupied by the second connection portion 112, improving space utilization, and achieving electrical connection between the second connection portion 112 and the pole 250. Of course, the present application does not exclude other connection methods.

[0070] In some embodiments, Figure 1 As shown, a connection hole 1121 for connecting a pole is provided in the second connection part 112. Specifically, the step of the pole 250 can be provided in the connection hole 1121 of the second connection part 112, so that the pole 250 and the second connection part 112 are assembled together, and then the two are fixedly connected by splicing welding.

[0071] In some embodiments, the first connection portion 111 and the second connection portion 112 may be located in the same plane, the second connection portion 112 is located in the annular space inside the first connection portion 111, and the first connection portion 111 and the second connection portion 112 are connected through the fusible portion 113. Alternatively, the first connection portion 111 and the second connection portion 112 may also be arranged at intervals along the axial direction of the current collecting assembly 100, that is, the two are located in different planes, and the first connection portion 111 and the second connection portion 112 are connected through the fusible portion 113. By arranging the first connection portion 111 and the second connection portion 112 at intervals along the axial direction of the current collecting assembly 100, when the current collecting assembly 100 is connected to the pole core and the electrode lead-out portion, it is not necessary to fold, which is convenient for connection, saves space, saves materials, and reduces production costs.

[0072] In some embodiments, the first connection portion 111 and the second connection portion 112 may be made of one or more metal materials such as copper, aluminum, and silver.

[0073] In some embodiments, Figure 1As shown, the first insulating member 120 includes a body 121 and at least one groove portion 122 disposed in the body 121 , and one fusible portion 113 is correspondingly disposed in one of the groove portions 122 .

[0074] Specifically, the main body 121 of the first insulating member 120 can be embedded in the through hole 114 of the circular plate body, and the fusible part 113 can be embedded in the groove part 122 of the first insulating member 120. The first surface of the fusible part 113 fits with the groove part 122 of the first insulating member 120, so that the fusible part 113 is insulated from the pole core, thereby avoiding the fusible part 113 from contacting the pole core after melting, so that the fusible part 113 can completely cut off the current path after melting.

[0075] Furthermore, if Figure 1 As shown, the body 121 may include at least two protrusions 1212 , one protrusion 1212 is correspondingly disposed in one through hole 114 , and a groove 122 is disposed between two adjacent protrusions 1212 .

[0076] Specifically, after the first insulating member 120 is combined with the fusible part 113, the protrusion 1212 is embedded in the through hole 114 of the circular plate body, and one protrusion 1212 is correspondingly arranged in one through hole 114, while the fusible part 113 is embedded in the groove part 122 between the two protrusions 1212, and one fusible part 113 is correspondingly arranged in one groove part 122.

[0077] In some embodiments, the first insulating member 120 can be bonded with insulating glue or integrally injection molded, preferably integrally injection molded, to ensure isolation of the fusible part 113 from the electrolyte, to prevent the arc generated when the fusible part 113 blows from contacting the electrolyte, and to enhance the safety of the fusible part 113 when it blows.

[0078] In some embodiments, the first insulating member 120 may be made of a high-temperature-resistant and voltage-resistant polymer material.

[0079] For example, the first insulating member 120 may use a high temperature resistant and voltage resistant insulating paint to cover the first surface of the fusible part 113 to achieve insulation between the fusible part 113 and the pole core.

[0080] Of course, the present application does not exclude that the first insulating member 120 may also be made of other suitable high temperature and voltage resistant polymer materials.

[0081] In some embodiments, Figure 1 As shown, the inner contour of the first connecting portion 111 is a first circular ring, and the outer contour of the first insulating member 120 is a second circular ring. The diameter of the first circular ring is smaller than the diameter of the second circular ring, and the difference between the two diameters is 0.5 mm to 2 mm.

[0082] Specifically, the diameter of the first annular shape may be referred to as the inner diameter of the first connecting portion 111, and the diameter of the second annular shape may be referred to as the outer diameter of the first insulating member 120, that is, the outer diameter of the first insulating member 120 is greater than the inner diameter of the first connecting portion 111. The first insulating member 120 may be a ring structure, and the first insulating member 120 of the ring structure may be embedded in the hollow ring formed by the through hole 114 and the fusible portion 113. The number of the grooves 122 in the first insulating member 120 may be the same as the number of the fusible portions 113, and one fusible portion 113 is correspondingly disposed in one groove 122.

[0083] In addition, by ensuring that the size of the first insulating member 120 is such that the outer diameter of the first insulating member 120 is larger than the inner diameter of the first connecting portion 111, the first insulating member 120 can completely wrap the fusible portion 113 while preventing the first insulating member 120 from being too large and affecting the connection between the first connecting portion 111 and the pole core.

[0084] In some embodiments, the current flow area of ​​the fusible portion 113 satisfies:

[0085] S

[0086] Among them, S is the current flow area of ​​the fusible part 113, U is the open circuit voltage of the battery cell, R1 is the resistance of the battery cell, R2 is the external short-circuit resistance, and I is the current flow capacity per unit area of ​​the fusible part 113.

[0087] In some embodiments, the current flow area of ​​the fusible portion 113 gradually decreases from the two ends of the fusible portion 113 to the middle of the fusible portion 113. The two ends of the fusible portion 113 refer to the two ends of the fusible portion 113 and the first connecting portion 111 and the second connecting portion 112 respectively.

[0088] Specifically, the shape of the fusible part 113 can be a "funnel-shaped" part with large sides and a small middle, so as to ensure that the current flow area of ​​the fusible part 113 gradually decreases from the two ends of the fusible part 113 to the middle of the fusible part 113. When an external short circuit occurs in the battery cell, the middle part of the "funnel-shaped" fusible part 113 has a small current flow area, resulting in excessive current. The temperature of this part rises sharply and melts, thereby cutting off the current path between the first connection part 111 and the second connection part 112, and then cutting off the current path between the positive and negative electrodes inside the battery cell, thereby preventing the battery cell from heating up sharply due to excessive current, and improving the safety of the battery cell when a short circuit occurs.

[0089] In addition, it is worth pointing out that the “funnel-shaped” fusible portion 113 can achieve fixed-point melting when melting occurs.

[0090] ​In some embodiments, in order to ensure that the fusible portion 113 can be blown in time, the minimum current flow area in the middle of the fusible portion 113 is limited accordingly.

[0091] Exemplarily, the current flow area at any end of the fusible part 113 is 1.5 to 4 times the minimum current flow area in the fusible part 113, such as 1.5 times, 2.0 times, 2.5 times, 3.0 times, 3.5 times, 4.0 times, etc. The multiple limit can ensure that when an external short circuit occurs in the battery cell, the middle part of the fusible part 113 can be fused in time, and the areas at both ends of the fusible part 113 are large, which can enhance the current flow capacity around the fusible part 113 and reduce heat generation during charging and discharging.

[0092] Of course, in addition to the above-mentioned multiple restrictions, the present application does not exclude the possibility that there may be other multiples between the current flow area at any end of the fusible part 113 and the minimum current flow area in the fusible part 113.

[0093] In some embodiments, the length of the fusible portion 113 is 2 mm to 5 mm, for example, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc. Figure 1 As shown, the length L of the fusible part 113 refers to the distance between the inner contour of the first connection part 111 and the outer contour of the second connection part 112. By limiting the length of the fusible part 113 to 2 mm to 5 mm, the fusible part 113 can be prevented from being too large to affect the distribution of welding points on the current collecting assembly 100.

[0094] Of course, in addition to the above lengths, according to the actual size of the battery cell, the present application does not exclude that the fusible part 113 may also have other length values.

[0095] According to another aspect of the present application, a cover plate assembly 200 is provided. Figure 3 and Figure 4 As shown, the cap plate assembly 200 includes: a cap plate 240, a current collecting assembly, a pole 250 and a second insulating member 230, wherein the pole 250 is connected to the second connecting portion of the current collecting member 210 and passes through the cap plate 240 to lead the electrode outward.

[0096] Among them, the current collecting component can be implemented as the current collecting component 100 mentioned above, and reference can be made to the introduction above, which will not be repeated here.

[0097] like Figure 3 As shown, the current collecting assembly may include a current collecting member 210 and a first insulating member 220 , and the current collecting member 210 may be formed by connecting a first connecting portion and a second connecting portion through a fusible portion.

[0098] In some embodiments, Figure 3 and Figure 4 As shown, the cap assembly 200 further includes a second insulating member 230 , which is disposed between the cap 240 and the fusible portion of the current collector 210 , with the second surface of the fusible portion facing the cap 240 , and the second insulating member 230 covers the second surface.

[0099] Specifically, the second insulating member 230 can be fitted with the second surface of the fusible part 113 to achieve insulation between the fusible part and the cover plate 240, and can prevent the fusible part from contacting the cover plate 240 after melting, so as to improve the safety of the battery cell.

[0100] In some embodiments, Figure 3 As shown, the second insulating member 230 is provided with a limiting protrusion 231, and the first connecting portion of the current collecting member 210 is provided with a limiting hole 1112 (see Figure 1 ), the limiting protrusion 231 is arranged in the limiting hole 1112 so that the second insulating member 230 and the current collecting member 210 are limited to each other.

[0101] Specifically, the limiting hole 1112 can be set on the outer edge of the first connection part, and the number of the limiting holes 1112 can be one or more. Correspondingly, the second insulating member 230 can be provided with a limiting protrusion 231 corresponding to the position of the limiting hole 1112, and the limiting protrusion 231 can be combined with the limiting hole 1112 to achieve mutual limitation between the second insulating member 230 and the current collecting member 210 to prevent rotation between the two, and to prevent the second insulating member 230 from rotating under the action of inertia to cover the welding area on the first connection part or scratch the welding mark between the first connection part and the pole core.

[0102] In some embodiments, Figure 3 As shown, the cover plate assembly 200 also includes a sealing ring 260, a pole insulator 270 and an electrical connector 280. The sealing ring 260 is sleeved on the pole 250. The pole 250 passes through the second insulating member 230, the cover plate 240 and the pole insulator 270 in sequence to connect to the electrical connector 280. The electrical connector 280 is used to electrically connect to the outside to supply power to the outside or obtain electrical energy from the outside.

[0103] The electrical connector 280, the pole insulating member 270, the cover plate 240, the sealing ring 260, the second insulating member 230 and the pole 250 can be connected by riveting. After riveting, the sealing ring 260 is compressed to a certain size to play a sealing and insulating role; under the action of the riveting force and the rebound force of the sealing ring 260, the electrical connector 280, the pole insulating member 270, the cover plate 240, and the sealing ring 260 are closely connected and cannot be displaced or rotated in the radial and axial directions.

[0104] In one example, the electrical connector 280 may be in the form of an aluminum block.

[0105] According to another aspect of the present application, a battery cell is provided, which comprises: a shell, a pole core and a cover assembly, wherein the shell has an opening; the pole core is arranged in the shell; the first connecting portion of the current collector is connected to the pole core, and the cover assembly closes the opening.

[0106] The cover plate assembly can be implemented as the cover plate assembly 200 mentioned above, and the above description can be referred to, and no further description is given here. The cover plate assembly can be connected to the housing by welding.

[0107] According to another aspect of the present application, a battery pack is provided, the battery pack including a battery cell.

[0108] Among them, the battery cell can be implemented as the battery cell 200 mentioned above, and reference can be made to the above introduction, which will not be repeated here.

[0109] The number of cells in the battery pack may be one or more, and there is no limitation on this. When there are more than one cell, the cells may be connected in series or in parallel, or some of the cells may be connected in series and the other cells may be connected in parallel.

[0110] According to another aspect of the present application, an electrical device is provided, and the electrical device includes a battery cell or a battery pack.

[0111] Among them, the battery cell can be implemented as the battery cell mentioned above, and the battery pack can be implemented as the battery pack mentioned above. Please refer to the introduction above and will not repeat them here.

[0112] It should be noted that the electrical equipment mentioned above may include vehicles, ships, aircraft, energy storage equipment, etc., without limitation thereto.

[0113] In summary, according to the current collecting assembly, cover assembly, battery cell, battery pack and electrical equipment of the embodiments of the present application, a fusible part is provided to connect the first connection part and the second connection part, the current flow area of ​​the first connection part and the current flow area of ​​the second connection part are larger than the current flow area of ​​the fusible part, and a first insulating part is provided to cover the first surface of the fusible part. When an external short circuit occurs in the battery cell, the fusible part can be blown in time, and the first insulating part can prevent the fusible part from contacting the pole core after blowing, thereby achieving insulation between the fusible part and the pole core, thereby cutting off the current loop between the positive and negative poles inside the battery cell, avoiding continuous short circuit of the battery cell, and cutting off the heat generation source of the battery cell, reducing temperature rise, avoiding external short circuit and causing battery cell out of control, and improving the safety of the battery cell.

[0114] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0115] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various application aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the application point is that the corresponding technical problem can be solved with less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0116] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0117] It should be noted that the above embodiments illustrate rather than limit the present application, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be construed as a limitation to the claims. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

Claims

1. A current collecting assembly, characterized in that: A current collecting member is included, and the current collecting member includes: A first connecting portion, used for connecting the pole core; A second connecting portion, used for connecting to an electrode lead-out portion; at least one fusible part, the fusible part connecting the first connection part and the second connection part; wherein the current flow area of ​​the first connection part and the current flow area of ​​the second connection part are larger than the current flow area of ​​the fusible part; The fusible part has a first surface and a second surface opposite to each other, wherein the first surface faces the pole core; the current collecting assembly further comprises a first insulating member, wherein the first insulating member covers the first surface of the fusible part.

2. The current collecting assembly according to claim 1, characterized in that: The current collecting part includes a circular plate body, on which at least two through holes arranged in a circumferential direction are provided, the portion of the circular plate body between two adjacent through holes forms the fusible part, the portion of the circular plate body located radially inside the fusible part forms the second connecting part, and the portion of the circular plate body located radially outside the fusible part forms the first connecting part.

3. The current collecting assembly according to claim 2, characterized in that: The first insulating member includes a body and at least one groove portion arranged in the body, and one fusible portion is correspondingly arranged in one of the groove portions.

4. The current collecting assembly according to claim 3, characterized in that: The body includes at least two protrusions, one of the protrusions is correspondingly arranged in one of the through holes, and one of the grooves is arranged between two adjacent protrusions.

5. The current collecting assembly according to any one of claims 1 to 4, characterized in that: The first connecting portion is provided with an exhaust hole for exhausting the gas in the battery core.

6. The current collecting assembly according to any one of claims 1 to 4, characterized in that: The second connecting portion is provided with a connecting hole for connecting a pole.

7. The current collecting assembly according to any one of claims 1 to 4, characterized in that: The current flow area of ​​the fusible part gradually decreases from the two ends of the fusible part to the middle of the fusible part.

8. The current collecting assembly according to claim 7, characterized in that: The current flow area at any end of the fusible part is 1.5 to 4 times the minimum current flow area in the fusible part.

9. The current collecting assembly according to claim 7, characterized in that: The length of the fusible portion is 2 mm to 5 mm.

10. The current collecting assembly according to any one of claims 2 to 4, characterized in that: The inner contour of the first connecting portion is in the shape of a first circular ring, and the outer contour of the first insulating member is in the shape of a second circular ring. The diameter of the first circular ring is smaller than the diameter of the second circular ring, and the difference between the diameters of the first circular ring and the second circular ring is 0.5 mm to 2 mm.

11. A cover plate assembly, characterized in that: The cover plate assembly comprises: Cover plate; The current collecting assembly according to any one of claims 1 to 10; The pole is connected to the second connection portion of the current collector and passes through the cover plate to lead the electrode outward.

12. The cover plate assembly according to claim 11, wherein: The cover plate assembly further includes a second insulating member, which is disposed between the cover plate and the fusible portion of the current collector, wherein a second surface of the fusible portion faces the cover plate, and the second insulating member covers the second surface.

13. The cover plate assembly according to claim 12, wherein: A limiting protrusion is arranged on the second insulating member, a limiting hole is arranged on the first connecting portion of the current collecting member, and the limiting protrusion is arranged in the limiting hole so that the second insulating member and the current collecting member are mutually limited.

14. The cover plate assembly according to claim 12, wherein: The cover plate assembly also includes a sealing ring, a pole insulator and an electrical connector. The sealing ring is sleeved on the pole. The pole passes through the second insulating member, the cover plate and the pole insulator in sequence to connect to the electrical connector. The electrical connector is used to electrically connect to the outside.

15. A battery cell, characterized in that: The battery cell comprises: a housing having an opening; A pole core, disposed in the shell; According to any one of claims 11 to 14, the first connecting portion of the current collecting member is connected to the pole core, and the cover plate assembly closes the opening.

16. A battery pack, characterized in that: The battery pack comprises the battery cell as claimed in claim 15.

17. An electrical equipment, characterized in that: The electrical device includes the battery cell as claimed in claim 15 or the battery pack as claimed in claim 16.

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