Battery cell assembly and battery

Abstract

The embodiment of the utility model discloses a battery cell assembly and a battery, and belongs to the technical field of batteries, the battery cell assembly comprises a battery cell, and the battery cell comprises a battery cell body and a tab arranged on the battery cell body; the insulating part wraps at least part of the outer part of the battery cell, and the insulating part is used for isolating the battery cell from the shell; the bonding piece is arranged on one side, close to the battery core, of the insulating piece, and the insulating piece is connected with the battery core through the bonding piece. The fixing effect of the insulating film is relatively good, so that possible sliding, lateral displacement and the like in the long-time use process can be avoided, the insulating effect on the battery cell is ensured to the greatest extent, the risk of short circuit caused by contact between the battery cell body and the tabs and the shell can be effectively prevented, and the service life of the battery cell is prolonged. And the risk of internal short circuit caused by conduction of the positive and negative electrodes of the battery cell is avoided, and the safety performance of the battery is relatively high.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly relates to a battery cell assembly and a battery. Background Art

[0002] A battery includes a housing and a battery cell, and when the battery cell is disposed in the housing, there may be a risk of short circuit when the battery cell contacts the aluminum housing.

[0003] In order to improve the insulation of the battery cell, generally, an insulating film is coated on the outside of the battery cell before the battery cell is put into the housing process, which effectively prevents the risk of short circuit caused by the contact between the battery cell and the housing and ensures the safety performance of the battery. In the related art, the insulating film is generally attached to the battery cell by heating.

[0004] However, in the above insulation method, the fixing effect of the insulating film is poor, the insulation of the battery cell is poor, and the safety performance of the battery is low. Summary of the Utility Model

[0005] In view of the above problems, the present application provides a battery cell assembly and a battery, in which the fixing effect of the insulating film is good, which is beneficial to avoiding situations such as sliding and side shifting that may occur during long-term use, thereby ensuring the insulation performance of the battery cell to the greatest extent, effectively preventing the risk of short circuit caused by the contact between the battery cell body and the ear and the housing, and being beneficial to avoiding the risk of internal short circuit caused by the conduction of the positive and negative electrodes of the battery cell, and the safety performance of the battery is high.

[0006] To achieve the above object, the present application provides the following technical solutions:

[0007] In a first aspect of an embodiment of the present application, a battery cell assembly is provided, which is installed in a housing of a battery. The battery cell assembly includes a battery cell, and the battery cell includes a battery cell body and an ear disposed at an end of the battery cell body; an insulating member, the insulating member wraps around the outside of the battery cell body and a part of the outside of the ear, and the insulating member is used to isolate the battery cell and the housing; an adhesive member, the adhesive member is disposed on a side of the insulating member close to the battery cell and bonds the insulating member and the battery cell.

[0008] In an implementable embodiment, the insulating member includes an insulating body, the insulating body wraps around the outside of the battery cell body, and the insulating body is used to isolate the battery cell body and the housing; the adhesive member includes an adhesive body, the adhesive body is disposed on a side of the insulating body close to the battery cell body, and the insulating body and the battery cell body are connected through the adhesive body.

[0009] In an implementable embodiment, the insulating member includes an insulating bent portion connected to an end of the insulating body; the insulating bent portion bends toward one side of the tab, the insulating bent portion wraps around a part of the outside of the tab, and the insulating bent portion is used to isolate part of the tab and the housing; the bonding member includes a bonding bent portion connected to an end of the bonding body; the bonding bent portion is disposed on a side of the insulating bent portion close to the tab, and the insulating bent portion and the tab are connected through the bonding bent portion.

[0010] In an implementable embodiment, the insulating member includes any one of a polyolefin member, a polypropylene member, or a polyethylene member; and / or, the bonding member includes any one of an acrylic member, an epoxy resin member, a polyurethane member, or a butyl rubber.

[0011] In an implementable embodiment, a current collector and a current lead are further included. The current collector is disposed on a side of the tab away from the cell body, and the current lead is connected to a side of the current collector away from the tab; at least part of the insulating member is connected to at least part of the outside of the current collector, and the current lead and at least part of the insulating member are arranged in a staggered manner on the current collector.

[0012] In an implementable embodiment, the current collector has a welding portion, the welding portion of the current collector is welded to the tab, and at least part of the insulating member is located on the outer periphery of the welding portion; and / or, in a direction from the center to the edge of the current collector, a plurality of exhaust holes are formed in the current collector, and at least part of the insulating member is located on the outer periphery of the outermost exhaust hole.

[0013] In an implementable embodiment, the tab includes a first tab and a second tab with opposite electric polarities, and the first tab and the second tab are disposed at different positions on the cell body; the current collector includes a first current collecting portion and a second current collecting portion, the first current collecting portion is disposed on the first tab, the second current collecting portion is disposed on the second tab, and the current lead is disposed on at least one of the first current collecting portion and the second current collecting portion; the insulating bent portion includes a first insulating bent edge that wraps around at least part of the outside of the first current collecting portion, the bonding bent portion includes a first bonding bent edge, and the first insulating bent edge and the first current collecting portion are connected through the first bonding bent edge; and / or, the insulating bent portion includes a second insulating bent edge that wraps around at least part of the outside of the second current collecting portion, the bonding bent portion includes a second bonding bent edge, and the second insulating bent edge and the second tab are connected through the second bonding bent edge.

[0014] In an implementable embodiment, the insulating bent portion includes a first insulating bent edge, and the bending width of the first insulating bent edge is x1; the current lead-out member is disposed on the first current collecting portion, the center of the circle where the outermost point of the current lead-out member is located is concentric with the center of the ring where the first insulating bent edge is located. Along the same radial direction, the distance between the inner ring edge of the first insulating bent edge and the circle where the outermost point of the current lead-out member is located is d1, and the radius of the battery cell is r1; wherein, x1≥3 mm, d1>0 mm; x1, d1, and r1 satisfy: x1 + d1<r1; and / or, the insulating bent portion includes a second insulating bent edge, the bending width of the second insulating bent edge is x2, and the distance between the inner ring edge of the second insulating bent edge and the edge of the welding portion is d2; wherein, x2≥0 mm, d2≥3 mm; x2, d2, and r1 satisfy: x2 + d2<r1

[0015] In an implementable embodiment, the height of the insulating member is h1, the height of the battery cell body is h2, the height of the current collecting member is w, the bending width of the first insulating bent edge is x1, and the bending width of the second insulating bent edge is x2; wherein, h1, h2, w, x1, x2, d1, and d2 satisfy: h2 + w<h1<h1 + w + x1 + x2 + d1 + d2.

[0016] In the second aspect of the embodiments of the present application, a battery is provided, including a housing and a battery cell assembly, and the battery cell assembly is installed in the housing.

[0017] The embodiments of the present application provide a battery cell assembly and a battery. The battery cell assembly includes an insulating member, and the insulating member wraps around the outside of the battery cell body and a part of the outside of the tab. In this way, the insulating member can play a certain insulating role for the battery cell to the greatest extent, ensuring the insulating performance of the battery cell, thereby helping to avoid the risk of short circuit caused by the contact between the battery cell and the housing; at the same time, it helps to avoid the problem that the battery cell is easily scratched by the battery housing; the battery cell assembly includes an adhesive member, and the insulating member wraps the battery cell through the adhesive member, and the fixing effect of the insulating member is good, which is beneficial to avoid situations such as sliding and side shifting that may occur during long-term use, so as to ensure the insulating effect on the battery cell to the greatest extent, effectively prevent the risk of short circuit caused by the contact between the battery cell and the housing, and is beneficial to avoid the risk of internal short circuit caused by the conduction of the positive and negative electrodes of the battery cell, and the safety performance of the battery is relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the battery cell assembly provided by the embodiments of the present application;

[0019] Figure 2Schematic diagram of the structure of the insulating member wrapped around the battery cell of the battery cell assembly provided by the embodiment of the present application Figure 1 ;

[0020] Figure 3 Schematic diagram of the structure of the insulating member wrapped around the battery cell of the battery cell assembly provided by the embodiment of the present application Figure 2 ;

[0021] Figure 4 Schematic diagram of the structure of the insulating member and the bonding member of the battery cell assembly provided by the embodiment of the present application;

[0022] Figure 5 Schematic diagram of the structure of the insulating member wrapped around the first current collector of the battery cell assembly provided by the embodiment of the present application;

[0023] Figure 6 Schematic diagram of the structure of the insulating member wrapped around the second current collector of the battery cell assembly provided by the embodiment of the present application;

[0024] Figure 7 Schematic diagram of the structure of the first current collector of the battery cell assembly provided by the embodiment of the present application;

[0025] Figure 8 Schematic diagram of the structure of the second current collector of the battery cell assembly provided by the embodiment of the present application;

[0026] Figure 9 Schematic diagram of the structure of the insulating member of the battery cell assembly provided by the embodiment of the present application.

[0027] Explanation of reference numerals:

[0028] 100 - Battery cell assembly;

[0029] 110 - Battery cell; 111 - Battery cell body; 112 - Tab;

[0030] 1121 - First tab; 1122 - Second tab; 120 - Insulating member;

[0031] 121 - Insulating body; 122 - Insulating bent portion; 1221 - First insulating bent edge;

[0032] 1222 - Second insulating bent edge; 130 - Bonding member; 140 - Current collector;

[0033] 141 - First current collector; 142 - Second current collector; 143 - Welding portion;

[0034] 144 - Vent hole; 150 - Current lead-out member. Detailed implementation manners

[0035] The battery includes a housing and an electric core. The electric core includes an electric core body and ear tabs disposed on the electric core body. The electric core is disposed in the housing. When the electric core contacts the aluminum shell, there may be a risk of short circuit. To improve the insulation of the electric core, generally, an insulating film is coated on the outside of the electric core before the shelling process, effectively preventing the risk of short circuit caused by the contact between the electric core and the housing, and ensuring the safety performance of the battery.

[0036] In the related art, the insulating film is made of a heat-shrinkable material and then attached to the electric core by heating. However, during the complex and long-term use process, the insulation performance of the insulating film decreases relatively quickly. The insulating film may slide, shift, etc., and may even fall off from the electric core. The fixing effect of the insulating film is poor, and the insulation performance of the electric core is poor, which easily leads to the risk of short circuit formed by the exposed foil of the electric core contacting the housing. In addition, during the charging and discharging process of the battery, the electric core vibrates continuously, which easily drives the diaphragm between the positive and negative electrodes of the electric core to shift or tear, and the positive and negative electrodes of the electric core are easily conducted to form an internal short circuit, and the safety performance of the battery is low. In addition, in the related art, the insulating film only wraps around the side of the electric core body and does not extend to insulate the ear tabs, and there is a risk of short circuit due to the contact between the ear tabs and the housing.

[0037] To solve the above technical problems, an embodiment of the present application provides an electric core assembly and a battery. The electric core assembly includes an insulating member that wraps around the outside of the electric core body and a part of the outside of the ear tabs. In this way, the insulating member can play a certain insulating role for the electric core to the greatest extent, ensuring the insulation performance of the electric core, thereby helping to avoid the risk of short circuit caused by the contact between the electric core and the housing. At the same time, it helps to avoid the problem that the electric core is easily scratched by the battery housing. The electric core assembly includes an adhesive member, and the insulating member wraps the electric core through the adhesive member. The fixing effect of the insulating member is good, which is beneficial to avoiding situations such as sliding and side shifting that may occur during long-term use, thereby ensuring the insulation effect on the electric core to the greatest extent, effectively preventing the risk of short circuit caused by the contact between the electric core and the housing, and being beneficial to avoiding the risk of internal short circuit formed by the conduction of the positive and negative electrodes of the electric core, and the safety performance of the battery is high.

[0038] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar components or components with the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0039] An embodiment of the present application provides a battery, which may include a housing and a battery cell assembly 100, and the battery cell assembly 100 is installed in the housing. Among them, the housing may include a battery outer shell and a battery cover, and the battery cover is closed on the battery outer shell.

[0040] In an embodiment of the present application, the housing may be an aluminum shell housing, or the housing may be a steel shell housing, and this embodiment does not limit this. The battery may be a lithium-ion battery or a sodium-ion battery, etc., and this embodiment does not limit this.

[0041] Referring to Figures 1 to 3 As shown, the battery cell assembly 100 may include a battery cell 110 and an insulating member 120. Among them, the insulating member 120 is wrapped outside the battery cell 110, and the insulating member 120 is used to isolate the battery cell 110 from the housing. In this way, on the one hand, the insulating member 120 can play a certain insulating role for the battery cell 110, ensuring the insulation performance of the battery cell 110, thereby helping to avoid the risk of short circuit caused by the contact between the battery cell 110 and the housing; on the other hand, it helps to avoid damage to the battery cell 110 during the assembly process, reducing the product defect rate, and can also avoid the introduction of foreign objects in the film coating process and the problem that the foreign objects pierce the insulating member 120 after being squeezed, thereby improving the production efficiency of the battery.

[0042] In an embodiment of the present application, referring to Figure 4 As shown, the structure of the insulating member 120 is not limited. Exemplarily, the insulating member 120 in this embodiment may be an insulating film. Among them, the thickness W1 of the insulating film is not limited, and it can be specifically set according to actual needs.

[0043] In order to improve the fixing effect of the insulating member 120 on the battery cell 110, in an embodiment of the present application, referring to Figure 4 As shown, it may further include an adhesive member 130. The adhesive member 130 is disposed on the side of the insulating member 120 close to the battery cell 110 and bonds the insulating member 120 and the battery cell 110. In this way, compared with the problem that the insulating film in the related art is prone to slipping, the insulating member 120 of the present application wraps the battery cell 110 through the adhesive member 130, and the fixing effect of the insulating member 120 is better, which is beneficial to avoiding situations such as sliding and side shifting that may occur during long-term use, thereby ensuring the insulation effect on the battery cell 110 to the greatest extent, effectively preventing the risk of short circuit caused by the contact between the battery cell 110 and the housing, and being beneficial to avoiding the risk of internal short circuit caused by the conduction of the positive and negative electrodes of the battery cell 110, and the safety performance of the battery is relatively high.

[0044] In an embodiment of the present application, the structure of the adhesive member 130 is not limited. Exemplarily, referring to Figure 4 As shown, the adhesive member 130 in this embodiment may be an adhesive layer. Among them, the thickness W2 of the adhesive layer is not limited, and it can be specifically set according to actual needs.

[0045] In the embodiments of the present application, with reference to Figure 1 as shown, the battery cell 110 includes a battery cell body 111 and electrode tabs 112 provided at the ends of the battery cell body 111. During the operation of the battery, there may be a risk of short circuit when the battery cell 110 contacts the aluminum shell. Specifically, the contact between the battery cell 110 and the aluminum shell may include: the battery cell body 111 contacting the shell; or, the electrode tab 112 contacting the shell. Therefore, in order to ensure the insulation of the battery cell 110 to the greatest extent, in the embodiments of the present application, the insulating member 120 is wrapped around the outside of the battery cell body 111 and part of the outside of the electrode tab 112, and the insulating member 120 is used to isolate the battery cell 110 and the shell.

[0046] In this way, compared with the related art where the insulating film is only wrapped around the side of the battery cell body 111, the insulating member 120 of the present application not only wraps around the outside of the battery cell body 111, but also can wrap around part of the outside of the electrode tab 112. In this way, it can play a certain insulating role for the battery cell 110 to the greatest extent, ensure the insulation performance of the battery cell 110, and thus help to avoid the risk of short circuit caused by the contact between the battery cell 110 and the shell.

[0047] It should be noted that wrapping part of the outside of the electrode tab 112 means that the insulating member 120 can wrap part of the electrode tab 112, or the insulating member 120 can also wrap the entire electrode tab 112. This embodiment does not limit this.

[0048] It should be noted that the insulating member 120 is in a ring structure. In this way, the ring-shaped insulating member 120 surrounds and wraps the outside of the battery cell 110, which is beneficial to realizing the complete wrapping of the battery cell 110 and is beneficial to avoiding problems such as exposed copper foil.

[0049] In an implementable embodiment, with reference to Figure 2 and Figure 3 as shown, the insulating member 120 may include an insulating body 121. The insulating body 121 is wrapped around the outside of the battery cell body 111, and the insulating body 121 is used to isolate the battery cell body 111 and the shell. In this way, the insulating body 121 plays a certain insulating role for the battery cell body 111, ensures the insulation performance of the battery cell 110, and thus helps to avoid the risk of short circuit caused by the contact between the battery cell body 111 and the shell.

[0050] It can be understood that the insulating body 121 is in a ring structure, and the insulating body 121 surrounds and wraps the outer wall surface of the battery cell body 111.

[0051] In an embodiment of the present application, the bonding member 130 may include a bonding body, and the bonding body is disposed on a side of the insulating body 121 close to the battery cell body 111. In this way, the insulating body 121 and the battery cell body 111 are connected through the bonding body, and the bonding body fixes the insulating body 121 on the battery cell body 111. The fixing effect of the insulating body 121 is good, which helps to avoid situations such as sliding and lateral displacement that may occur during long-term use of the insulating body 121, thereby ensuring the insulation effect on the battery cell body 111 to the greatest extent, and further effectively preventing the risk of short circuit caused by the contact between the battery cell body 111 and the housing.

[0052] In an implementable embodiment, with reference to Figure 2 and Figure 3 as shown, the insulating member 120 may include an insulating bent portion 122, and the insulating bent portion 122 is connected to an end of the insulating body 121; the insulating bent portion 122 bends toward a side of the tab 112, and the insulating bent portion 122 wraps around a part of the outside of the tab 112, and the insulating bent portion 122 is used to insulate a part of the tab 112 and the housing. In this way, the insulating bent portion 122 plays a certain insulating role for the tab 112, ensuring the insulation performance of the tab 112, and thus helping to avoid the risk of short circuit caused by the contact between the tab 112 and the housing.

[0053] It can be understood that the insulating bent portion 122 is a ring structure.

[0054] In an embodiment of the present application, the bonding member 130 may include a bonding bent portion, and the bonding bent portion is connected to an end of the bonding body; the bonding bent portion is disposed on a side of the insulating bent portion 122 close to the tab 112. In this way, the insulating bent portion 122 and the tab 112 are connected through the bonding bent portion, and the bonding bent portion fixes the insulating bent portion 122 on the tab 112. The fixing effect of the insulating bent portion 122 is good, which helps to avoid the risk of short circuit caused by the contact between the tab 112 and the housing.

[0055] In an implementable embodiment, the material of the insulating member 120 is not limited, and the insulating member 120 may include any one of a polyolefin member, a polypropylene member, or a polyethylene member. Exemplarily, the material of the insulating member 120 may be a polyolefin; or, the material of the insulating member 120 may be a polypropylene; or, the material of the insulating member 120 may be a polyethylene. This embodiment does not make a limitation in this regard.

[0056] In the embodiments of the present application, there is no limitation on the material of the bonding member 130. The bonding member 130 may include any one of an acrylic member, an epoxy resin member, a polyurethane member, or a butyl rubber. Exemplarily, the material of the bonding member 130 may be acrylic; or, the material of the bonding member 130 may be epoxy resin; or, the material of the bonding member 130 may be polyurethane; or, the material of the bonding member 130 may be butyl rubber. This embodiment does not make a limitation in this regard.

[0057] In an implementable embodiment, referring to Figures 5 to 8 as shown, it may further include a current collector 140 and a current lead-out member 150. The current collector 140 is connected to the side of the tab 112 away from the cell body 111, and the current lead-out member 150 is connected to the side of the current collector 140 away from the tab 112.

[0058] In the embodiments of the present application, the current collector 140 is connected to the tab 112. The current collector 140 is used to lead out the electrical energy of the tab 112 to the positive terminal or the negative terminal of the battery. Among them, the current collector 140 in this embodiment may be a current collector plate. In the embodiments of the present application, the main function of the current lead-out member 150 is to transmit current. Among them, the current lead-out member 150 in this embodiment may be a bent lead-out piece.

[0059] In the embodiments of the present application, at least part of the insulating member 120 wraps at least part of the outside of the current collector 140, and the current lead-out member 150 and at least part of the insulating member 120 are arranged in a staggered manner on the current collector 140.

[0060] It should be noted that at least part of the insulating member 120 is an insulating bent portion 122, and the insulating bent portion 122 wraps at least part of the outside of the current collector 140. In addition, at least part of the outside of the current collector 140 means that the insulating bent portion 122 does not wrap the entire surface of the current collector 140. This is because the current collector 140 needs to be welded to the tab 112. If the entire surface of the current collector 140 is wrapped, it is easy to interfere with the welding of the tab 112. Therefore, in this embodiment, the insulating bent portion 122 wraps at least part of the outside of the current collector 140. In this way, not only can the insulation of the tab 112 be achieved, but also the welding of the current collector 140 and the tab 112 will not be affected.

[0061] It should be noted that there is no limitation on the area of at least part of the outside of the current collector 140, and it can be specifically set according to the actual situation.

[0062] In the embodiments of the present application, referring to Figure 5 and Figure 7As shown, the current lead-out member 150 and at least a part of the insulating member 120 are arranged offset on the current collector member 140. That is to say, both the current lead-out member 150 and at least a part of the insulating member 120 are on the surface of the current collector member 140, and the orthographic projections of the current lead-out member 150 and at least a part of the insulating member 120 on the surface where the current collector member 140 is located do not overlap. The reason for this setting is as follows: If the battery is in the process of charging and discharging, the current lead-out member 150 vibrates continuously. If the current lead-out member 150 and the insulating member 120 overlap each other, the current lead-out member 150 is likely to lift the insulating member 120 during the vibration process, and the insulating effect cannot be achieved well. Therefore, the present application can ensure the insulating effect to the greatest extent.

[0063] It should be noted that the distance between the current lead-out member 150 and at least a part of the insulating member 120 is not limited. Exemplarily, the current lead-out member 150 and at least a part of the insulating member 120 can be adjacent, and then the distance between the current lead-out member 150 and at least a part of the insulating member 120 is 0 mm; or, the distance between the current lead-out member 150 and at least a part of the insulating member 120 is greater than 0 mm. Specifically, it can be set according to actual needs.

[0064] In an implementable embodiment, referring to Figure 1 As shown, the current collector member 140 can have a welding portion 143. The welding portion 143 of the current collector member 140 is welded to the tab 112, and at least a part of the insulating member 120 is located on the outer periphery of the welding portion 143. In this way, not only can the insulation of the tab 112 be achieved, but also the welding of the current collector member 140 and the tab 112 will not be interfered.

[0065] In the embodiment of the present application, referring to Figures 5 to 8 As shown, along the direction from the center to the edge of the current collector member 140, a plurality of exhaust holes 144 can be opened on the current collector member 140, and at least a part of the insulating member 120 is located on the outer periphery of the outermost exhaust hole 144.

[0066] It should be noted that the exhaust holes 144 are provided on the current collector member 140 to ensure that the gas generated during the charging and discharging process of the battery can be discharged smoothly, avoid excessive pressure inside the battery, and thus ensure the safety performance of the battery; at the same time, it helps to prevent the abnormal increase of the pressure inside the battery, and further avoid safety problems such as battery expansion or rupture; in addition, the exhaust holes 144 also help the injection and absorption of the electrolyte, facilitate the operation during the spot welding of the tab 112, and further enhance the use safety and stability of the battery. Among them, the number of the exhaust holes 144 opened is not limited.

[0067] In the embodiment of the present application, at least a part of the insulating member 120 is located on the outer periphery of the outermost exhaust hole 144. In this way, it helps to avoid affecting the smooth discharge of the gas.

[0068] In an implementable embodiment, with reference to Figure 1 As shown, the tab 112 includes a first tab 1121 and a second tab 1122 with opposite electric polarities, and the first tab 1121 and the second tab 1122 are disposed at different positions of the battery cell body 111.

[0069] Among them, the positions of the first tab 1121 and the second tab 1122 are not limited. Exemplarily, in this embodiment, along the height direction of the battery cell body 111, taking the first tab 1121 and the second tab 1122 being disposed at opposite ends of the battery cell body 111 as an example for illustration.

[0070] Exemplarily, the first tab 1121 may be a positive tab, and the second tab 1122 may be a negative tab; or, the first tab 1121 may be a negative tab, and the second tab 1122 may be a positive tab. This embodiment does not limit this. Exemplarily, the first tab 1121 may be located at end A, and the second tab 1122 may be located at end B.

[0071] The current collector 140 may include a first current collecting portion 141 and a second current collecting portion 142. The first current collecting portion 141 is disposed on the first tab 1121, and the second current collecting portion 142 is disposed on the second tab 1122. Exemplarily, the first current collecting portion 141 is used to lead the electric energy of the first tab 1121 outwards to the positive terminal of the battery, and the second current collecting portion 142 is used to lead the electric energy of the second tab 1122 outwards to the negative terminal of the battery.

[0072] The current lead 150 is disposed on at least one of the first current collecting portion 141 and the second current collecting portion 142. Exemplarily, the current lead 150 may be disposed on the first current collecting portion 141; or, the current lead 150 may be disposed on the second current collecting portion 142; or, the current lead 150 may be disposed on both the first current collecting portion 141 and the second current collecting portion 142 at the same time. In this embodiment, mainly taking the current lead 150 being disposed on the first current collecting portion 141 as an example for illustration.

[0073] Among them, the structure of the insulating bending portion 122 is not limited. In this embodiment, mainly the following three structures are taken as examples for illustration.

[0074] One embodiment is that the insulating bending portion 122 may only include a first insulating bending edge 1221. The first insulating bending edge 1221 wraps around at least part of the outside of the first current collecting portion 141. The bonding bending portion includes a first bonding bending edge, and the first insulating bending edge 1221 and the first current collecting portion 141 are connected by the first bonding bending edge.

[0075] In one embodiment, the insulating bent portion 122 may only include the second insulating bent edge 1222. The second insulating bent edge 1222 wraps around at least part of the outside of the second current collecting portion 142. The bonding bent portion includes a second bonding bent edge. The second insulating bent edge 1222 and the second tab 1122 are connected through the second bonding bent edge.

[0076] In one embodiment, the insulating bent portion 122 may include a first insulating bent edge 1221 and a second insulating bent edge 1222.

[0077] In this embodiment, mainly taking the insulating bent portion 122 including the first insulating bent edge 1221 and the second insulating bent edge 1222 as an example for illustration, this helps to ensure the insulation performance of the battery cell 110 to the greatest extent.

[0078] In an implementable embodiment, referring to Figure 2 and Figure 5 As shown, the insulating bent portion 122 includes a first insulating bent edge 1221. The bending width of the first insulating bent edge 1221 may be x1. The current lead-out member 150 is disposed on the first current collecting portion 141. The center of the circle where the outermost point of the current lead-out member 150 is located is concentric with the center of the ring where the first insulating bent edge 1221 is located. Along the same radial direction, the distance between the inner ring edge of the first insulating bent edge 1221 and the circle where the outermost point of the current lead-out member 150 is located may be d1, and the radius of the battery cell 110 may be r1.

[0079] Wherein, x1 ≥ 3 mm, d1 > 0 mm; x1, d1 and r1 satisfy: x1 + d1 < r1.

[0080] In the embodiment of the present application, the bending width x1 of the first insulating bent edge 1221 may be 3 mm, 4 mm or any value greater than 3 mm set according to actual needs. This embodiment does not limit this.

[0081] In the embodiment of the present application, the distance d1 between the inner ring edge of the first insulating bent edge 1221 and the circle where the outermost point of the current lead-out member 150 is located means: taking the center of the circle as the center, along the same radial (i.e., radius) direction, the distance between the tangent of the inner ring edge of the first insulating bent edge 1221 and the tangent of the circle where the outermost point of the current lead-out member 150 is located. Exemplarily, d1 may be 0 mm, 1 mm, 2 mm or any value greater than 0 mm set according to actual needs. This embodiment does not limit this.

[0082] In the embodiments of the present application, the purpose of limiting x1 + d1 < r1 is as follows: When the current collector 140 is welded to the tab 112, such as the positive tab, if x1 + d1 ≥ r1, it is likely to cause interference in the welding with the positive tab. Therefore, in this embodiment, x1 + d1 < r1 is limited. In this way, not only can the insulation of the positive tab be achieved, but also the welding of the current collector 140 and the positive tab will not be affected.

[0083] In the embodiments of the present application, with reference to Figure 3 and Figure 6 as shown, the insulating bent portion 122 includes a second insulating bent edge 1222. The bending width of the second insulating bent edge 1222 can be x2, and the distance between the inner ring edge of the second insulating bent edge 1222 and the edge of the welding portion 143 can be d2.

[0084] Wherein, x2 ≥ 0 mm, d2 ≥ 3 mm, and x2, d2, and r1 satisfy: x2 + d2 < r1.

[0085] In the embodiments of the present application, the bending width x2 of the second insulating bent edge 1222 can be 0 mm, 1 mm, 2 mm, or any value greater than 0 mm set according to actual needs. This embodiment does not limit this.

[0086] In the embodiments of the present application, the distance d2 between the inner ring edge of the second insulating bent edge 1222 and the edge of the welding portion 143 can be 3 mm, 4 mm, or any value greater than 3 mm set according to actual needs. This embodiment does not limit this.

[0087] In the embodiments of the present application, the purpose of limiting x2 + d2 < r1 is as follows: When the current collector 140 is welded to the tab 112, such as the negative tab, if x1 + d1 ≥ r1, it is likely to cause interference in the welding with the negative tab. Therefore, in this embodiment, x1 + d1 < r1 is limited. In this way, not only can the insulation of the negative tab be achieved, but also the welding of the current collector 140 and the negative tab will not be affected.

[0088] Here, it should be noted that by setting x1 ≥ 3 mm and x2 ≥ 0 mm, x1 is greater than x2. This is because the housing generally carries an electric charge. Exemplarily, the housing carries a negative charge, the first tab 1121 carries a positive charge, and the second tab 1122 carries a negative charge. Among them, the charge carried by the housing is opposite to the charge carried by the first tab 1121, and the charge carried by the housing is the same as the charge carried by the second tab 1122. Among them, no short circuit will occur when the housing and the second tab 1122 with the same charge come into contact, and a short circuit will occur when the housing and the first tab 1121 with opposite charges come into contact. Therefore, in this embodiment, x1 ≥ 3 mm is limited, so as to ensure the insulation effect on the first tab 1121 and further ensure the insulation performance of the battery cell 110.

[0089] In one possible implementation, with reference to Figure 2 、 Figure 4 and Figure 9 as shown, the height of the insulating member 120 can be h1, the height of the battery cell body 111 can be h2, the height of the first current collector portion 141 is w1, the height of the second current collector portion 142 is w2, the bending width of the first insulating bending edge 1221 is x1, and the bending width of the second insulating bending edge 1222 is x2.

[0090] Among them, h1, h2, W3, W4, x1, x2, d1 and d2 satisfy: h2 + W3 + W4 < h1 < h1 + W3 + W4 + x1 + x2 + d1 + d2.

[0091] In the embodiments of the present application, the values of h1, h2, W3, W4, x1 and x2 are not further limited and can be specifically set according to actual needs.

[0092] In the embodiments of the present application, limiting h2 + W3 + W4 < h1 helps to ensure that the height of the insulating member 120 is higher than the height of the battery cell body 111, so as to help insulate the tab 112 on the basis of insulating the battery cell body 111, thereby maximizing the insulation performance of the battery cell 110.

[0093] In the embodiments of the present application, limiting h1 < h1 + W3 + W4 + x1 + x2 + d1 + d2 helps to ensure that the insulating bending portion 122 does not wrap the entire surface of the current collector member 140. In this way, not only can the tab 112 be insulated, but also the welding of the current collector member 140 and the tab 112 will not be affected.

[0094] Therefore, the embodiments of the present application provide a battery cell assembly and a battery. The battery cell assembly includes an insulating member that wraps around the outside of the battery cell body and a part of the outside of the tab. In this way, the insulating member can play a certain insulating role for the battery cell to the greatest extent, ensuring the insulation performance of the battery cell, thereby helping to avoid the risk of short circuit caused by the contact between the battery cell and the housing; at the same time, it helps to avoid the problem that the battery cell is easily scratched by the battery housing; the battery cell assembly includes an adhesive member, and the insulating member wraps the battery cell through the adhesive member, and the fixing effect of the insulating member is good, which is beneficial to avoiding situations such as sliding and lateral displacement that may occur during long-term use, thereby maximizing the insulation effect on the battery cell, effectively preventing the risk of short circuit caused by the contact between the battery cell and the housing, and being beneficial to avoiding the risk of internal short circuit caused by the conduction of the positive and negative electrodes of the battery cell, and the safety performance of the battery is relatively high.

[0095] It should be noted that in the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, or an indirect connection through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0096] In the description of the embodiments of the present application, the term "and / or" only represents an association relationship describing associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the term "at least one" represents any one or any combination of at least two of multiple types. For example, including at least one of A and B can represent any one or more elements selected from the set including A, B, and C.

[0097] In the description of the embodiments of the present application, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application. In addition, the meaning of the term "a plurality" is two or more, unless otherwise specifically and precisely defined.

[0098] In the description of the embodiments of the present application, the terms "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application.

Claims

1. A battery cell assembly, characterized in that: Installed in the battery housing, the battery cell assembly includes: A battery cell (110), the battery cell (110) comprising a battery cell body (111) and a pole ear (112) arranged at an end of the battery cell body (111); an insulating member (120), the insulating member (120) being wrapped around the outside of the battery cell body (111) and partially wrapped around the outside of the pole ear (112), the insulating member (120) being used to isolate the battery cell (110) from the shell; An adhesive member (130) is arranged on a side of the insulating member (120) close to the battery core (110) and bonds the insulating member (120) and the battery core (110).

2. The battery cell assembly according to claim 1, characterized in that: The insulating member (120) comprises an insulating body (121), wherein the insulating body (121) is wrapped around the outside of the battery cell body (111), and the insulating body (121) is used to isolate the battery cell body (111) from the shell; The adhesive component (130) comprises an adhesive body, the adhesive body is arranged on a side of the insulating body (121) close to the battery cell body (111), and the insulating body (121) and the battery cell body (111) are connected via the adhesive body.

3. The battery cell assembly according to claim 2, characterized in that: The insulating member (120) comprises an insulating bent portion (122), the insulating bent portion (122) being connected to an end of the insulating body (121); the insulating bent portion (122) is bent toward one side of the pole ear (112), the insulating bent portion (122) is wrapped around a portion of the outside of the pole ear (112), and the insulating bent portion (122) is used to isolate a portion of the pole ear (112) from the shell; The adhesive component (130) comprises an adhesive bending portion, which is connected to the end of the adhesive body; the adhesive bending portion is arranged on a side of the insulating bending portion (122) close to the pole lug (112), and the insulating bending portion (122) and the pole lug (112) are connected via the adhesive bending portion.

4. The battery core assembly according to any one of claims 1 to 3, characterized in that: The insulating member (120) comprises any one of a polyolefin member, a polypropylene member or a polyethylene member; And / or, the adhesive member (130) includes any one of an acrylic member, an epoxy resin member, a polyurethane member or a butyl rubber.

5. The battery cell assembly according to claim 3, characterized in that: It also includes a current collecting member (140) and a current lead-out member (150), wherein the current collecting member (140) is connected to a side of the pole ear (112) away from the battery cell body (111), and the current lead-out member (150) is connected to a side of the current collecting member (140) away from the pole ear (112); At least a portion of the insulating member (120) is wrapped around at least a portion of the exterior of the current collecting member (140), and the current lead-out member (150) and at least a portion of the insulating member (120) are staggeredly arranged on the current collecting member (140).

6. The battery cell assembly according to claim 5, characterized in that: The current collecting member (140) has a welding portion (143), the welding portion (143) of the current collecting member (140) and the pole tab (112) are connected by welding, and at least part of the insulating member (120) is located on the periphery of the welding portion (143); And / or, along the direction from the center to the edge of the current collecting member (140), a plurality of exhaust holes (144) are provided on the current collecting member (140), and at least part of the insulating member (120) is located at the periphery of the outermost exhaust hole (144).

7. The battery cell assembly according to claim 6, characterized in that: The pole lug (112) comprises a first pole lug (1121) and a second pole lug (1122) of opposite electrical properties, wherein the first pole lug (1121) and the second pole lug (1122) are arranged at different positions of the battery cell body (111); The current collecting member (140) comprises a first current collecting portion (141) and a second current collecting portion (142), the first current collecting portion (141) being arranged on the first pole lug (1121), the second current collecting portion (142) being arranged on the second pole lug (1122), and the current lead-out member (150) being arranged on at least one of the first current collecting portion (141) and the second current collecting portion (142); The insulating bent portion (122) comprises a first insulating bent edge (1221), the first insulating bent edge (1221) wraps around at least a portion of the outside of the first current collecting portion (141), the bonding bent portion comprises a first bonding bent edge, and the first insulating bent edge (1221) and the first current collecting portion (141) are connected via the first bonding bent edge; And / or, the insulating bending portion (122) includes a second insulating bending edge (1222), the second insulating bending edge (1222) is wrapped around at least a portion of the outside of the second collecting portion (142), the bonding bending portion includes a second bonding bending edge, and the second insulating bending edge (1222) and the second pole ear (1122) are connected via the second bonding bending edge.

8. The battery cell assembly according to claim 7, characterized in that: The insulating bent portion (122) comprises a first insulating bent edge (1221), and the bending width of the first insulating bent edge (1221) is x1; The current lead-out member (150) is arranged on the first current collecting portion (141), the center of the circle where the outermost point of the current lead-out member (150) is located is concentric with the center of the ring where the first insulating bent edge (1221) is located, along the same radial direction, the distance between the inner ring edge of the first insulating bent edge (1221) and the circle where the outermost point of the current lead-out member (150) is located is d1, and the radius of the battery cell (110) is r1; Wherein, x1≥3mm, d1>0mm; x1, d1 and r1 satisfy: x1+d1<r1; And / or, the insulating bent portion (122) comprises a second insulating bent edge (1222), the bending width of the second insulating bent edge (1222) is x2, and the distance between the inner ring edge of the second insulating bent edge (1222) and the edge of the welding portion (143) is d2; Among them, x2≥0mm, d2≥3mm; x2, d2 and r1 satisfy: x2+d2<r1.

9. The battery core assembly according to claim 8, characterized in that: The height of the insulating member (120) is h1, the height of the battery cell body (111) is h2, the height of the first current collecting portion (141) is W3, the height of the second current collecting portion (142) is W4, the bending width of the first insulating bending edge (1221) is x1, and the bending width of the second insulating bending edge (1222) is x2; Among them, h1, h2, W3, W4, x1, x2, d1 and d2 satisfy: h2+W3+W4<h1<h1+W3+W4+x1+x2+d1+d2.

10. A battery, characterized in that: It comprises a shell and a battery cell assembly according to any one of claims 1 to 9; the battery cell assembly is installed in the shell.

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