Insulating bracket, battery cell and battery device

Abstract

The utility model relates to battery manufacturing, and provides an insulating bracket, a battery cell and a battery device. The insulating support is used for the electrode assembly, the electrode assembly comprises a main body part and a tab connected with the main body part, and the insulating support comprises an enclosure body and a supporting body. The enclosure body is provided with an accommodating cavity for accommodating the main body part and two end openings communicated with the accommodating cavity; the supporting body covers at least one of the openings in the two ends of the enclosure body, and the supporting body is provided with an avoiding opening for the pole lug to penetrate through; wherein the enclosure body and the supporting body are configured into a whole. When the insulation support needs to be transported, the insulation support can be unfolded to be in a tiled shape, batch stacking is facilitated, the occupied space is reduced, and the transportation cost is reduced. As the enclosure body and the supporting body are of the integrated structure, the design thickness of the supporting body can be properly reduced, damage to the electrode assembly caused by the supporting body after relative displacement of the enclosure body and the supporting body can be avoided, the installation procedure can be greatly simplified, the production cost can be reduced, and the production efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery manufacturing, and in particular to an insulating bracket, a battery cell and a battery device. Background Art

[0002] In the related art, a battery device will be provided with a tab bracket on the side of the electrode assembly where the tab is provided, and the tab bracket is used to restrain the tab, thereby reducing the risk of the tab being loose and the tab being bent toward the electrode assembly. The tab bracket is usually provided on a mylar film (generally a polyester film), which is used to insulate and isolate the electrode assembly and the housing. However, the assembly process of the tab bracket and the mylar film is cumbersome, and there is a risk of the tab bracket being installed upside down. Utility Model Content

[0003] In view of this, the embodiments of the present application are intended to provide an insulating bracket, a battery cell, and a battery device, which can simplify the assembly process and prevent the insulating bracket from being installed upside down.

[0004] A first aspect of an embodiment of the present application provides an insulating support for an electrode assembly, wherein the electrode assembly comprises a main body and a tab connected to the main body, and the insulating support comprises:

[0005] The enclosure has a receiving cavity for receiving the main body and two openings at both ends communicating with the receiving cavity;

[0006] A support body, covering at least one of the openings at both ends of the enclosure, the support body having an escape opening for the tab to pass through;

[0007] Wherein, the enclosure and the support body are configured as an integral body.

[0008] When the insulating bracket needs to be transported, it can be unfolded into a flat shape, which is convenient for batch stacking to reduce the occupied space and transportation costs. When the insulating bracket is put into use, it can replace the mylar film to play an insulating role between the shell and the electrode assembly of the battery cell, and constrain the electrode assembly to reduce the gap between the pole pieces in the electrode assembly after the electrolyte is injected. At the same time, it can be used as a pole ear bracket to support the pole ear, reducing the possibility of loose or bent pole ears. Since the enclosure and the support body are an integrated structure, compared with the design of a split mylar film and pole ear bracket, the design thickness of the support body can be appropriately reduced. In this way, the space occupied by the support body is reduced, and the usable space of the electrode assembly in the shell of a limited volume can be increased. When designing the battery cell, the volume of the electrode assembly can be appropriately increased to improve the volume energy density of the battery cell. The enclosure and the support body are an integrated structure, and the support body has an avoidance port. That is, according to the avoidance port, the installation direction of the insulating bracket relative to the electrode assembly can be obtained, forming a fool-proof design to prevent reverse installation. And it can avoid the support body from causing damage to the electrode assembly after the enclosure and the support body are relatively displaced. In addition, there is no need to use the hot melt process to fix the tab bracket on the mylar film, which can greatly simplify the installation process, reduce production costs, and improve production efficiency. Compared with split manufacturing, it can improve structural strength.

[0009] In some embodiments, the electrode assembly is a laminated type, and the enclosure includes:

[0010] A first enclosure portion is arranged along the stacking direction of the electrode assembly;

[0011] A second enclosure portion is arranged perpendicularly to the stacking direction of the electrode assembly;

[0012] The transition part, the adjacent first enclosure part and the second enclosure part are connected by the transition part to enclose and form the accommodating cavity.

[0013] The electrode assembly is square and includes a plurality of stacked pole pieces. The first enclosure corresponds to the stacking surface formed by wrapping the plurality of stacked pole pieces, and the second enclosure corresponds to the extended surface of the pole pieces. The provision of the adapter facilitates folding the first enclosure and the second enclosure to form an enclosure, and if the thickness of the adapter is increased, the distance between the adapter and the shell can be reduced, for example, the adapter is abutted against the shell, which can improve the structural strength between the electrode assembly and the shell and improve the fixing effect of the electrode assembly.

[0014] In some embodiments, the thickness of the transition portion is greater than the thickness of the first enclosure portion and the second enclosure portion, respectively.

[0015] The transition part is provided to form an air-avoiding space between the insulating support and the shell, which protects the electrode assembly and prevents the electrode assembly from being damaged when an external force impacts the shell. The thickness of the transition part is greater than that of the first enclosure part and the second enclosure part, and can play a role similar to a reinforcing rib to reduce the shaking amplitude of the electrode assembly in the shell.

[0016] In some embodiments, the thickness of the transition portion is 0.15-0.3 mm.

[0017] In this way, the thickness of the corresponding transition part can be selected according to the needs of different battery cell structures, thereby improving the structural strength of the transition part and facilitating fixation with the shell.

[0018] In some embodiments, the thickness of the first enclosure portion and the second enclosure portion are both 0.1-0.2 mm.

[0019] It can solve the problem that the insulation effect is affected by the thin thickness of the first enclosure and the second enclosure, and the problem that the first enclosure and the second enclosure are too thick and occupy too much space.

[0020] In some embodiments, the thickness of the transition portion is 0.15-0.3 mm; the thickness of the first enclosure portion and the second enclosure portion are both 0.1-0.2 mm.

[0021] In some embodiments, the enclosure has a plurality of through holes; or the first enclosure has a plurality of through holes.

[0022] This allows the electrolyte to be injected between adjacent pole pieces in the stacking direction of the electrode assembly, ie, the stacking direction of the pole pieces, thereby improving the wetting effect of the electrolyte on the pole pieces.

[0023] In some embodiments, the enclosure and the support can be unfolded into a flat state.

[0024] In this way, when the insulating bracket is produced, batch unloading is convenient; when it is transported or managed, the enclosure and the support body are unfolded to facilitate batch processing, such as transportation or temporary storage, which can save space and reduce transportation costs. When the insulating bracket is folded, an action similar to folding a paper box can be adopted. After folding into an enclosure, the enclosure and the support body are enclosed to form a receiving cavity, which can be easy to operate.

[0025] In some embodiments, the enclosure includes a first enclosure portion, a second enclosure portion and a transition portion; when the insulating bracket is unfolded into a flat state, the two ends of the support body along the first direction are respectively connected to the second enclosure portion, one end of one second enclosure portion along the second direction is connected to one first enclosure portion through the transition portion, and the other end of another second enclosure portion along the second direction is connected to another first enclosure portion through the transition portion; wherein the first direction and the second direction are perpendicular.

[0026] After deployment, a second enclosure, a support body and another second enclosure are sequentially connected along the first direction X to form a continuous flat state, and the first enclosure, the adapter and the second enclosure are sequentially connected along the second direction Y to form a continuous flat state, which can reduce the area occupied in the horizontal direction after deployment. The transportation cost can be reduced during transportation. Exemplarily, the extension length of the support body along the first direction is less than the extension length of the support body along the second direction. The first enclosure is connected to the second enclosure through the adapter along the second direction, which can increase the connection length compared to the connection of the first enclosure to the support body along the second direction, and reduce the possibility of breakage during deployment due to too short a connection length.

[0027] In some embodiments, the enclosure further includes a first overlapping portion, and the support body includes a supporting portion and a second overlapping portion; when the insulating bracket is unfolded into a flat state, the two ends of the supporting portion along the second direction are respectively connected to the second overlapping portion, and the two ends of the supporting portion along the first direction are respectively connected to the second enclosure, and the two ends of each second enclosure along the second direction are respectively connected to the first enclosure and the first overlapping portion through the transition portion.

[0028] The thickness of the support portion and the second overlap portion can be the same or different. The support portion covers at least one of the openings at both ends of the enclosure, and the support portion has an escape opening for the pole ear to pass through. After the second overlap portion is folded, it is located on the inner side of the first enclosure, and after the first overlap portion is folded, it is also located on the inner side of the first enclosure. By providing the first overlap portion and the second overlap portion, after folding, since the first overlap portion and the second overlap portion have overlapping parts with the first enclosure respectively, it is convenient to perform the connection operation during folding, and the wrapping effect of the insulating bracket can be improved. After the insulating bracket is enclosed on the electrode assembly, the first overlap portion and the second overlap portion can prevent the electrolyte from directly flushing the pole piece, and there is a gap between the first overlap portion and the second overlap portion and the first enclosure, which does not affect the electrolyte flowing into each pole piece through the gap.

[0029] In some embodiments, the enclosure includes a first enclosure portion and a second enclosure portion; when the insulating bracket is unfolded into a flat state, the two ends of the support body along the first direction are respectively connected to the second enclosure portion, and the two ends of the support body along the second direction are respectively connected to the first enclosure portion; wherein the first direction and the second direction are perpendicular.

[0030] After unfolding, a second enclosure, a support body and another second enclosure are sequentially connected along the first direction to form a continuous flat shape, and the first enclosure, the support body and another first enclosure are connected along the second direction Y to form a continuous flat shape, which can reduce the occupied volume and reduce the transportation cost during transportation.

[0031] In some embodiments, the enclosure further includes a transition portion and a first overlapping portion; when the insulating bracket is unfolded into a flat state, one of the adjacent first enclosure portion and the second enclosure portion is connected to the first overlapping portion via the transition portion.

[0032] When folding, the first overlapping portion is folded toward the first enclosure portion and overlapped on the first enclosure portion, and the second overlapping portion is folded along the transition portion and overlapped on the first enclosure portion. By providing the first overlapping portion, after folding, the first overlapping portion and the first enclosure portion have an overlapping portion, which facilitates the connection operation when folding.

[0033] In some embodiments, the insulating bracket further includes an adhesive member for bonding the enclosure and the support body to fit the electrode assembly.

[0034] After the flat insulating bracket is enclosed and formed, the insulating bracket is mounted on the electrode assembly through an adhesive to reduce the gap between the enclosure and the support body and the electrode assembly, and reduce the shaking amplitude of the electrode assembly in the shell.

[0035] In some embodiments, the adhesive member is an adhesive tape.

[0036] The enclosure and the support body are bound circumferentially by adhesive tape, which facilitates operation and can reduce production costs.

[0037] In some embodiments, the adhesive is disposed on the enclosure and / or the support, so that the enclosure, the support and the adhesive are integrated.

[0038] Exemplarily, the enclosure has a viscous buckle, which can be fixed to the support body to fix the enclosure and the support body. In other embodiments, the support body has a viscous buckle, which can be fixed to the enclosure to fix the enclosure and the support body. Or both the enclosure and the support body have viscous buckles.

[0039] In some embodiments, the thickness of the support body at the open end of the accommodating cavity is 0.4-2.0 mm.

[0040] In this way, it is possible to avoid the support body being too thin to affect the insulation effect and the support effect on the tab, while avoiding the support body being too thick to occupy too much space.

[0041] In some embodiments, the insulating bracket is made of PET, PP or LCP.

[0042] The insulating bracket can have good electrical insulation performance, chemical corrosion resistance and mechanical strength to prevent short circuits, avoid corrosion of the electrolyte, and play a role in protecting the electrode assembly.

[0043] A second aspect of an embodiment of the present application provides a battery cell, including:

[0044] An electrode assembly, comprising a main body and a tab connected to the main body;

[0045] The insulating bracket described in any one of the above items is sleeved on the electrode assembly, and the electrode tab is inserted into the avoidance opening;

[0046] The shell has a containing space with one end open, and the insulating bracket is arranged in the containing space.

[0047] The battery cell provided in the embodiment of the present application has the same beneficial effects as the above-mentioned insulating bracket.

[0048] In some embodiments, the battery cell further includes an end cap assembly disposed at the open end of the shell, and a hot melt zone is formed on the enclosure and / or the support body for connection with the end cap assembly.

[0049] The hot melt area and the end cap assembly are fastened and connected by a hot melt process to improve the structural strength. Exemplarily, the end cap assembly includes a lower plastic plate, and the hot melt area is connected to the lower plastic plate.

[0050] A third aspect of the embodiments of the present application provides a battery device, comprising the battery cell described above.

[0051] The battery device provided in the embodiment of the present application has the same beneficial effects as the above-mentioned insulating bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a schematic diagram of the structure of the insulating bracket in the first embodiment of the present application, wherein the insulating bracket is flat;

[0053] Figure 2 It is a schematic structural diagram of an insulating support and an electrode assembly in one embodiment of the present application, wherein the insulating support is in an enclosed shape;

[0054] Figure 3 for Figure 2 A front view of the insulating support and electrode assembly shown;

[0055] Figure 4 for Figure 2 A top view of the insulating support and electrode assembly shown;

[0056] Figure 5 for Figure 2 A side view of the insulating support and electrode assembly shown;

[0057] Figure 6 This is a schematic diagram of the structure of the insulating bracket in the second embodiment of the present application, wherein the insulating bracket is flat;

[0058] Figure 7 This is a schematic diagram of the structure of the insulating bracket in the third embodiment of the present application, wherein the insulating bracket is flat;

[0059] Figure 8 This is a schematic structural diagram of the insulating bracket in the fourth embodiment of the present application, wherein the insulating bracket is flat.

[0060] Description of Reference Numerals

[0061] Insulating support 100; enclosure 10; through hole 10a; first enclosure portion 11; second enclosure portion 12; transition portion 13; first overlap portion 14; hot melt zone 15; support body 20; avoidance opening 20a; support portion 21; second overlap portion 22; electrode assembly 200; pole ear 210. DETAILED DESCRIPTION

[0062] The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.

[0063] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by the terms "first direction", "second direction", "vertical", "inner", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of 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 therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0064] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0065] In the description of this specification, the description with reference to the terms "some embodiments", "exemplarily", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine different embodiments or examples described in this application and the features of different embodiments or examples without contradiction.

[0066] In the related art, the tabs are prone to rebound after shaping, resulting in tab splitting, undercutting, etc. Tab brackets are usually provided to support the tabs to reduce the risk of tab looseness and tab bending toward one side of the electrode assembly. Tab brackets are usually provided on a mylar film (usually a polyester film), which is used to insulate and isolate the electrode assembly and the housing. However, the assembly process of the tab bracket and the mylar film is cumbersome, and there is a risk of reverse installation of the tab bracket.

[0067] In view of this, please refer to Figure 1-Figure 5 The embodiment of the present application provides an insulating support 100 for an electrode assembly 200. The electrode assembly 200 includes a main body and a tab 210 connected to the main body. The insulating support 100 includes a housing 10 and a support 20. The housing 10 has a receiving cavity for receiving the main body and two openings at both ends communicating with the receiving cavity; the support 20 covers at least one of the two openings at both ends of the housing 10, and the support 20 has an avoidance opening 20a for the tab 210 to pass through; wherein the housing 10 and the support 20 are configured as an integral body.

[0068] The embodiment of the present application also provides a battery cell, comprising the insulating support 100, the electrode assembly 200 and the shell as described in any one of the embodiments of the present application, the electrode assembly 200 comprising a main body and a pole ear 210 connected to the main body; the insulating support 100 is sleeved on the electrode assembly 200, and the pole ear 210 is passed through the avoidance opening 20a; the shell has a accommodating space with one end open, and the insulating support 100 is arranged in the accommodating space.

[0069] The battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes, and the prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal battery, etc., and the present application has no particular limitation. The present application embodiment takes a square-shell battery as an example for explanation.

[0070] The battery cell may be a secondary battery, which refers to a battery cell that can be continuously used by activating the active material by charging after the battery cell is discharged.

[0071] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0072] The tabs 210 can lead current out of the electrode assembly. The tabs 210 include a positive tab and a negative tab.

[0073] Exemplarily, the main body includes a positive electrode sheet and a negative electrode sheet. The main body may be a winding structure, in which the positive electrode sheet and the negative electrode sheet are wound into a winding structure. The main body may also be a laminated structure, for example, a plurality of positive electrode sheets and a plurality of negative electrode sheets are alternately stacked. The main body may also be a mixed structure of winding and lamination.

[0074] Exemplarily, the main body also includes an isolating member, and a plurality of isolating members may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0075] Exemplarily, the insulating support 100 has a flat shape and an enclosed shape. When the insulating support 100 needs to be transported, it can be unfolded into a flat shape for batch stacking to reduce the occupied space and reduce the transportation cost. When the insulating support 100 is put into use, it can replace the mylar film to play an insulating role between the shell of the battery cell and the electrode assembly 200, and constrain the electrode assembly 200 to reduce the gap between the pole pieces in the electrode assembly 200 after the electrolyte is injected. At the same time, it can serve as a pole ear support to support the pole ear 210, reducing the possibility of the pole ear 210 being loose or bent.

[0076] The support body 20 covers one or both of the two end openings of the enclosure 10. Exemplarily, the electrode assembly 200 includes a positive electrode ear and a negative electrode ear, the positive electrode ear and the negative electrode ear are located at the same end opening, the support body 20 covers the end opening where the positive electrode ear and the negative electrode ear are located, and has a avoidance opening 20a for the positive electrode ear and the negative electrode ear to pass through. In other embodiments, the electrode assembly 200 includes a positive electrode ear and a negative electrode ear, the positive electrode ear and the negative electrode ear are respectively located at the two end openings, the support body 20 has a avoidance opening 20a for the positive electrode ear to pass through, or the support body 20 has a avoidance opening 20a for the negative electrode ear to pass through.

[0077] When the support body 20 covers one or two of the openings at the two ends of the enclosure 10, when installing the insulating bracket 100, the insulating bracket 100 can be folded along the surface of the electrode assembly 200 from a flat state, wrapped on the electrode assembly 200 to form an enclosure, and then the insulating bracket 100 is fixed on the electrode assembly 200.

[0078] When the support body 20 covers one of the two end openings of the enclosure 10, that is, the other end opening is open, the insulating bracket 100 can be folded from a flat shape to an enclosed shape, the avoidance opening 20a is aligned with the electrode ear 210, the insulating bracket 100 is sleeved on the electrode assembly 200, and then the insulating bracket 100 is fixed on the electrode assembly 200.

[0079] Since the enclosure 10 and the support body 20 are an integrated structure, the design thickness of the support body 20 can be appropriately reduced compared to designing a separate mylar film and tab bracket. In this way, the space occupied by the support body 20 is reduced, and the usable space of the electrode assembly 200 in the shell of limited volume can be increased. When designing the battery cell, the volume of the electrode assembly 200 can be appropriately increased to improve the volume energy density of the battery cell. The volume energy density refers to the electrical energy released per unit volume or mass of the battery.

[0080] Exemplarily, the thickness of the support body 20 at the open end of the accommodating cavity is 0.4-2.0 mm. For example, the thickness of the support body 20 at the open end of the accommodating cavity can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2.0 mm, etc. In this way, it is possible to avoid the support body 20 being too thin to affect the insulation effect and the support effect of the tab 210, while avoiding the support body 20 being too thick to occupy too much space.

[0081] The enclosure 10 and the support body 20 are an integrated structure, and the support body 20 has an escape opening 20a. That is to say, the installation direction of the insulating bracket 100 relative to the electrode assembly 200 can be obtained according to the escape opening 20a, forming a fool-proof design to prevent reverse installation. It can also prevent the support body 20 from causing damage to the electrode assembly 200 after the enclosure 10 and the support body 20 are relatively displaced. In addition, there is no need to use a hot melt process to fix the tab bracket on the mylar film, which can greatly simplify the installation process, reduce production costs, and improve production efficiency. Compared with split manufacturing, it can improve structural strength.

[0082] For some examples, see Figure 1 and Figure 2 The electrode assembly 200 is a laminated type, and the enclosure 10 includes a first enclosure 11 and a second enclosure 12. The first enclosure 11 is arranged along the stacking direction of the electrode assembly 200; the second enclosure 12 is arranged perpendicular to the stacking direction of the electrode assembly 200; the adjacent first enclosure 11 and second enclosure 12 are connected by a transition portion 13 to form a housing cavity. Figure 2 The H in the figure represents the stacking direction.

[0083] The electrode assembly 200 is square and includes a plurality of stacked pole pieces. The first enclosure 11 corresponds to the stacking surface formed by wrapping the plurality of stacked pole pieces, and the second enclosure 12 corresponds to the extended surface of the wrapped pole pieces. The adapter 13 is provided to facilitate folding the first enclosure and the second enclosure to form an enclosure, and if the thickness of the adapter 13 is increased, the distance between the adapter 13 and the shell can be reduced, for example, the adapter 13 is abutted against the shell, which can improve the structural strength between the electrode assembly 200 and the shell and improve the fixing effect of the electrode assembly 200.

[0084] In some embodiments, the thickness of the adapter 13 is greater than the thickness of the first enclosure 11 and the second enclosure 12. The adapter 13 can be provided to form an air-avoiding space between the insulating bracket 100 and the shell, thereby protecting the electrode assembly 200 and preventing the electrode assembly 200 from being damaged when an external force impacts the shell. The thickness of the adapter 13 is greater than the thickness of the first enclosure 11 and the second enclosure 12, and can play a role similar to a reinforcing rib to reduce the shaking amplitude of the electrode assembly 200 in the shell.

[0085] In some embodiments, the thickness of the adapter 13 is 0.15-0.3 mm. For example, the thickness of the adapter 13 may be 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.20 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, 0.26 mm, 0.27 mm, 0.28 mm, 0.29 mm or 0.30 mm, etc. In this way, the thickness of the adapter 13 may be selected according to the needs of different battery cell structures, so as to improve the structural strength of the adapter 13 and facilitate fixing with the housing.

[0086] In some embodiments, the thickness of the first enclosure 11 and the second enclosure 12 are both 0.1-0.2 mm. For example, the first enclosure 11 and the second enclosure 12 can be 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm or 0.2 mm, which can solve the problem that the first enclosure 11 and the second enclosure 12 are too thin to affect the insulation effect, and the first enclosure 11 and the second enclosure 12 are too thick to occupy too much space.

[0087] For example, see Figure 1-Figure 2 The enclosure 10 has a plurality of through holes 10 a for facilitating the electrolyte to flow through the through holes 10 a into the electrode assembly 200 when the electrolyte is injected into the battery cell.

[0088] Exemplarily, the first enclosure 11 has a plurality of through holes 10a, so as to inject the electrolyte between adjacent pole pieces in the stacking direction of the electrode assembly 200, that is, the stacking direction of the pole pieces, and improve the wetting effect of the electrolyte on the pole pieces.

[0089] For some examples, see Figure 1 , the enclosure 10 and the support 20 can be unfolded into a flat state. In this way, when the insulating bracket 100 is produced, batch unloading is convenient; in the case of transportation or management, the enclosure 10 and the support 20 are unfolded to facilitate batch processing, such as transportation or temporary storage, which can save space and reduce transportation costs. When the insulating bracket 100 is folded, an action similar to folding a paper box can be adopted. After folding into an enclosure, the enclosure 10 and the support 20 are enclosed to form a receiving cavity, which can be easy to operate.

[0090] It is understandable that, since the thickness of the enclosure 10 and the support 20 may be consistent or inconsistent, and the thickness of each part of the enclosure 10 and the support 20 may be consistent or inconsistent, the enclosure 10 and the support 20 may not be located on a standard horizontal plane after unfolding. Flattening does not mean that each surface of the enclosure 10 and the support 20 must be completely flush on the same horizontal plane.

[0091] For some examples, see Figure 1-Figure 2 The enclosure 10 includes a first enclosure portion 11, a second enclosure portion 12 and a transition portion 13; when the insulating bracket 100 is unfolded into a flat state, the two ends of the support body 20 along the first direction X are respectively connected to the second enclosure portions 12, one end of a second enclosure portion 12 along the second direction Y is connected to a first enclosure portion 11 through the transition portion 13, and the other end of another second enclosure portion 12 along the second direction Y is connected to another first enclosure portion 11 through the transition portion 13; wherein the first direction X and the second direction Y are perpendicular.

[0092] After unfolding, a second enclosure 12, a support body 20 and another second enclosure 12 are sequentially connected along the first direction X to form a continuous flat shape, and the first enclosure 11, the adapter 13 and the second enclosure 12 are sequentially connected along the second direction Y to form a continuous flat shape, which can reduce the area occupied in the horizontal direction after unfolding. The transportation cost can be reduced during transportation. Exemplarily, the extension length of the support body 20 along the first direction X is less than the extension length of the support body 20 along the second direction Y. The first enclosure 11 is connected to the second enclosure 12 through the adapter 13 along the second direction Y. Compared with the first enclosure 11 being connected to the support body 20 along the second direction Y, the connection length can be increased, and the possibility of the connection length being too short and breaking during the unfolding process can be reduced.

[0093] In some embodiments, the enclosure 10 also includes a first overlapping portion 14, and the support body 20 includes a supporting portion 21 and a second overlapping portion 22; when the insulating bracket 100 is unfolded into a flat state, the two ends of the supporting portion 21 along the second direction are respectively connected to the second overlapping portion 22, and the two ends of the supporting portion 21 along the first direction are respectively connected to the second enclosure 12, and the two ends of each second enclosure 12 along the second direction are respectively connected to the first enclosure 11 and the first overlapping portion 14 through the transition portion 13.

[0094] The thickness of the support portion 21 and the second overlap portion 22 can be the same or different. The support portion 21 covers at least one of the two end openings of the enclosure 10, and the support portion 21 has an escape opening 20a for the pole ear 210 to pass through. The second overlap portion 22 is located inside the first enclosure 11 after folding, and the first overlap portion 14 is also located inside the first enclosure 11 after folding. By providing the first overlap portion 14 and the second overlap portion 22, after folding, since the first overlap portion 14 and the second overlap portion 22 have overlapping parts with the first enclosure 11 respectively, it is convenient to perform the connection operation during folding, which can improve the wrapping effect of the insulating bracket. After the insulating bracket 200 is enclosed on the electrode assembly 200, the first overlap portion 14 and the second overlap portion 22 can prevent the electrolyte from directly scouring the pole piece, and there is a gap between the first overlap portion 14 and the second overlap portion 22 and the first enclosure 11, which does not affect the electrolyte from flowing into each pole piece through the gap.

[0095] For example, the thickness of the support portion 21 may be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2.0 mm, etc. In this way, the problem that the insulation effect and the supporting effect of the tab 210 are affected by the small thickness of the support body 20, and the problem that the support body 20 occupies too much space due to the large thickness of the support body 20 can be solved. It can be understood that when the second overlapping portion 22 is not provided, the thickness of the support portion 21 is the thickness of the support body 20.

[0096] For some examples, see Figure 6 and Figure 7 The enclosure 10 includes a first enclosure portion 11 and a second enclosure portion 12; when the insulating bracket 100 is unfolded into a flat state, the two ends of the support body 20 along the first direction X are respectively connected to the second enclosure portion 12, and the two ends of the support body 20 along the second direction Y are respectively connected to the first enclosure portion 11; wherein the first direction X and the second direction Y are perpendicular.

[0097] After unfolding, one second enclosure 12, the support body 20 and another second enclosure 12 are sequentially connected along the first direction to form a continuous flat shape, and the first enclosure 11, the support body 20 and another first enclosure 11 are connected along the second direction Y to form a continuous flat shape, which can reduce the occupied volume and reduce the transportation cost during transportation.

[0098] For some examples, see Figure 6-Figure 8 The enclosure 10 further includes a transition portion 13 and a first overlap portion 14; when the insulating bracket 100 is unfolded into a flat state, one of the adjacent first enclosure portion 11 and the second enclosure portion 12 is connected to the first overlap portion 14 through the transition portion 13. Figure 6 As shown, both sides of the first enclosure portion 11 are connected to the first overlap portion 14 via a transition portion 13. Figure 7 As shown, the two sides of the second enclosure portion 12 are connected to the first overlap portion 14 via the transition portion 13. Figure 8 As shown, the first overlapping portion 14 overlaps the first enclosure 11 and the second enclosure 12 in the counterclockwise direction through the transition portion 13. In an embodiment not shown, the first overlapping portion 14 can also overlap the first enclosure 11 and the second enclosure 12 in the clockwise direction through the transition portion 13.

[0099] When folding, the first overlapping portion 14 is folded toward the first enclosure portion 11 and overlapped on the first enclosure portion 11, and the second overlapping portion 22 is folded along the transition portion 13 and overlapped on the first enclosure portion 11. By providing the first overlapping portion 14, after folding, since the first overlapping portion 14 and the first enclosure portion 11 have an overlapping portion, the connection operation is convenient when folding.

[0100] In some embodiments, the insulating support 100 further includes an adhesive member for bonding the enclosure 10 and the support 20 to fit the electrode assembly 200. After the flat insulating support 100 is enclosed and formed, the insulating support 100 is sleeved on the electrode assembly 200 through the adhesive member to reduce the gap between the enclosure 10 and the support 20 and the electrode assembly 200, and reduce the shaking amplitude of the electrode assembly 200 in the shell.

[0101] In some embodiments, the adhesive member is an adhesive tape, which is used to bind the enclosure 10 and the support 20 along the circumferential direction, thereby facilitating operation and reducing production costs.

[0102] In some embodiments, the adhesive is disposed on the enclosure 10 and / or the support 20, so that the enclosure 10, the support and the adhesive are integrated. Exemplarily, the enclosure 10 has an adhesive buckle, which can be fixed to the support 20, so that the enclosure 10 and the support 20 are fixed. In other embodiments, the support 20 has an adhesive buckle, which can be fixed to the enclosure 10, so that the enclosure 10 and the support 20 are fixed. Or both the enclosure 10 and the support 20 have an adhesive buckle.

[0103] In some embodiments, the insulating support 100 is made of PET (polyethylene terephthalate), PP (polypropylene) or LCP (liquid crystal polymer), so that the insulating support 100 has good electrical insulation performance, chemical corrosion resistance and mechanical strength to prevent short circuits, avoid corrosion of the electrolyte, and protect the electrode assembly 200.

[0104] In some embodiments, the battery cell further includes an end cap assembly, which is disposed at the open end of the shell, and a hot melt zone is formed on the enclosure 10 and / or the support 20 for connecting with the end cap assembly. The hot melt zone and the end cap assembly are fastened together by a hot melt process to improve the structural strength. Exemplarily, the end cap assembly includes a lower plastic plate, and the hot melt zone is connected to the lower plastic plate.

[0105] For example, see Figure 1 A hot melt zone 15 is formed on the enclosure 10 such as the second enclosure portion 12 , or a hot melt zone 15 is formed on the support 20 , or a hot melt zone 15 is formed on both the enclosure 10 and the support 20 .

[0106] The present application also provides a battery device including the above-mentioned battery cell. The battery device is used to store or provide electrical energy. The battery device may include one or more battery cell assemblies to provide voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel, or in mixed series through a busbar. In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0107] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, and the battery cell assembly is accommodated in the case. As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the case by fixing the battery module in the case. As an example, the battery cell assembly may also be accommodated in the case by directly fixing a plurality of battery cells to the case.

[0108] In some embodiments, the insulating support 100 is used for the electrode assembly 200, the electrode assembly 200 includes a main body and a tab 210 connected to the main body, and the insulating support 100 includes a protective body 10 and a support body 20. The protective body 10 has a housing cavity for accommodating the main body, and two end openings communicating with the housing cavity; the support body 20 covers at least one of the two end openings of the protective body 10, and the support body 20 has an escape opening 20a for the tab 210 to pass through; wherein the protective body 10 and the support body 20 are configured as an integral body. The thickness of the support body 20 at the open end of the housing cavity is 0.4-2.0 mm. The electrode assembly 200 is a laminated type, and the protective body 10 includes a first protective part 11 and a second protective part 12. The first enclosure 11 is arranged along the stacking direction of the electrode assembly 200; the second enclosure 12 is arranged perpendicular to the stacking direction of the electrode assembly 200; the adjacent first enclosure 11 and second enclosure 12 are connected by a transition portion 13 to enclose and form a receiving cavity. The thickness of the transition portion 13 is 0.25 mm, and the thickness of the first enclosure 11 and the second enclosure 12 are both 0.12 mm. The first enclosure 11 has a plurality of through holes 10a. The enclosure 10 and the support 20 can be unfolded into a flat state. The enclosure 10 includes a first enclosure 11, a second enclosure 12 and a transition portion 13; when the insulating bracket 100 is unfolded into a flat state, the two ends of the support body 20 along the first direction X are respectively connected to the second enclosure 12, one end of a second enclosure 12 along the second direction Y is connected to a first enclosure 11 through the transition portion 13, and the other end of another second enclosure 12 along the second direction Y is connected to another first enclosure 11 through the transition portion 13; wherein the first direction X and the second direction Y are perpendicular. The enclosure 10 also includes a first lap portion 14, and the support body 20 includes a support portion 21 and a second lap portion 22; when the insulating bracket 100 is unfolded into a flat state, the two ends of the support portion 21 along the second direction are respectively connected to the second lap portion 22, the two ends of the support portion 21 along the first direction are respectively connected to the second enclosure 12, and the two ends of each second enclosure 12 along the second direction are respectively connected to the first enclosure 11 and the first lap portion 14 through the transition portion 13. The insulating support 100 further includes an adhesive member for bonding the enclosure 10 and the support 20 to fit the electrode assembly 200. The adhesive member is an adhesive tape. The insulating support 100 is made of PET.

[0109] In this embodiment, illustratively, the insulating support 100 has a flat shape and an enclosed shape. When the insulating support 100 needs to be transported, it can be unfolded into a flat shape to facilitate batch stacking, so as to reduce the occupied space and reduce the transportation cost. When the insulating support 100 is put into use, it can replace the mylar film to play an insulating role between the shell of the battery cell and the electrode assembly 200, and constrain the electrode assembly 200 to reduce the gap between the pole pieces in the electrode assembly 200 after the electrolyte is injected. At the same time, it can serve as a pole ear support to support the pole ear 210, reducing the possibility of the pole ear 210 being loose or bent. Since the enclosure 10 and the support body 20 are an integrated structure, compared with the design of a separate mylar film and pole ear support, the design thickness of the support body 20 can be appropriately reduced, thereby reducing the space occupied by the support body 20. The enclosure 10 and the support body 20 are an integrated structure, and the support body 20 has an avoidance opening 20a, that is, the installation direction of the insulating bracket 100 relative to the electrode assembly 200 can be obtained according to the avoidance opening 20a, forming a fool-proof design to prevent reverse installation. And it can avoid the support body 20 from causing damage to the electrode assembly 200 after the enclosure 10 and the support body 20 are relatively displaced. In addition, there is no need to use a hot melt process to fix the pole ear bracket on the mylar film, which can greatly simplify the installation process, reduce production costs, and improve production efficiency. Compared with split manufacturing, the structural strength can be improved. The electrode assembly 200 is square, and the electrode assembly 200 includes a plurality of stacked pole pieces. The first enclosure 11 corresponds to the stacking surface formed by wrapping a plurality of stacked pole pieces, and the second enclosure 12 corresponds to the extended surface of the wrapped pole piece. The adapter 13 is provided to facilitate folding the first enclosure and the second enclosure to form an enclosure, and if the thickness of the adapter 13 is increased, the distance between the adapter 13 and the shell can be reduced, for example, the adapter 13 is abutted against the shell, which can improve the structural strength between the electrode assembly 200 and the shell, and improve the fixing effect of the electrode assembly 200. By providing the adapter 13, it is convenient to form an air-avoiding space between the insulating bracket 100 and the shell, which plays a protective role on the electrode assembly 200 and prevents the electrode assembly 200 from being damaged when the external force impacts the shell. It can take into account the problem that the insulation effect is affected by the small thickness of the first enclosure 11 and the second enclosure 12, and the first enclosure 11 and the second enclosure 12 occupy too much space due to the large thickness. The through hole 10a is provided to facilitate the injection of electrolyte between adjacent pole pieces in the stacking direction of the electrode assembly 200, that is, the stacking direction of the pole pieces, to improve the infiltration effect of the electrolyte on the pole pieces.The enclosure 10 and the support 20 can be unfolded into a flat state. During transportation or management, the enclosure 10 and the support 20 are unfolded to facilitate batch processing. After unfolding, a second enclosure 12, the support 20 and the other second enclosure 12 are sequentially connected along the first direction X to form a continuous flat state, and the first enclosure 11, the transition portion 13 and the second enclosure 12 are sequentially connected along the second direction Y to form a continuous flat state, which can reduce the area occupied in the horizontal direction after unfolding. The transportation cost can be reduced during transportation. By providing the first overlap portion 14 and the second overlap portion 22, after folding, since the first overlap portion 14 and the second overlap portion 22 respectively have overlapping parts with the first enclosure 11, it is convenient to perform the connection operation when folding, which can improve the wrapping effect of the insulating bracket. After the insulating bracket 200 is enclosed on the electrode assembly 200, the first overlap portion 14 and the second overlap portion 22 can prevent the electrolyte from directly scouring the electrode pieces, and there is a gap between the first overlap portion 14 and the second overlap portion 22 and the first enclosure 11, which does not affect the electrolyte flowing into each electrode piece through the gap. After the flat insulating bracket 100 is enclosed and formed, the insulating bracket 100 is sleeved on the electrode assembly 200 by tape, reducing the gap between the enclosure 10 and the support body 20 and the electrode assembly 200, and reducing the shaking amplitude of the electrode assembly 200 in the shell. The enclosure 10 and the support body 20 are bound circumferentially by tape, which is convenient for operation and can reduce production costs.

[0110] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An insulating bracket for an electrode assembly, characterized in that: The electrode assembly comprises a main body and a tab connected to the main body, and the insulating support comprises: The enclosure has a receiving cavity for receiving the main body and two openings at both ends communicating with the receiving cavity; A support body, covering at least one of the openings at both ends of the enclosure, the support body having an escape opening for the tab to pass through; Wherein, the enclosure and the support body are configured as an integral body.

2. The insulating bracket according to claim 1, characterized in that: The electrode assembly is a laminated type, and the enclosure comprises: A first enclosure portion is arranged along the stacking direction of the electrode assembly; A second enclosure portion is arranged perpendicularly to the stacking direction of the electrode assembly; The transition part, the adjacent first enclosure part and the second enclosure part are connected by the transition part to enclose and form the accommodating cavity.

3. The insulating bracket according to claim 2, characterized in that: The thickness of the transition portion is respectively greater than the thickness of the first enclosure portion and the second enclosure portion.

4. The insulating bracket according to claim 3, characterized in that: The thickness of the transition portion is 0.15-0.3 mm; and / or, The thickness of the first enclosure part and the second enclosure part are both 0.1-0.2 mm.

5. The insulating bracket according to claim 2, characterized in that: The enclosure has a plurality of through holes; or the first enclosure has a plurality of through holes.

6. The insulating support according to any one of claims 1 to 5, characterized in that: The enclosure and the support can be unfolded into a flat state.

7. The insulating bracket according to claim 6, characterized in that: The enclosure body comprises a first enclosure portion, a second enclosure portion and a transition portion; When the insulating bracket is unfolded into a flat state, the two ends of the support body along the first direction are respectively connected to the second enclosure parts, one end of one of the second enclosure parts along the second direction is connected to one of the first enclosure parts through the adapter part, and the other end of another second enclosure part along the second direction is connected to another first enclosure part through the adapter part; The first direction is perpendicular to the second direction.

8. The insulating bracket according to claim 7, characterized in that: The enclosure further includes a first overlapping portion, and the support body includes a supporting portion and a second overlapping portion; When the insulating bracket is unfolded into a flat state, the two ends of the supporting part along the second direction are respectively connected to the second overlapping part, and the two ends of the supporting part along the first direction are respectively connected to the second enclosure part, and the two ends of each second enclosure part along the second direction are respectively connected to the first enclosure part and the first overlapping part through the transition part.

9. The insulating bracket according to claim 6, characterized in that: The enclosure includes a first enclosure portion and a second enclosure portion; When the insulating bracket is unfolded into a flat shape, two ends of the support body along the first direction are respectively connected to the second enclosure part, and two ends of the support body along the second direction are respectively connected to the first enclosure part; The first direction is perpendicular to the second direction.

10. The insulating bracket according to claim 9, characterized in that: The enclosure also includes a transition portion and a first overlapping portion; When the insulating bracket is unfolded into a flat state, one of the adjacent first enclosure portion and the second enclosure portion is connected to the first overlapping portion through the transition portion.

11. The insulating bracket according to claim 6, characterized in that: The insulating support further comprises: An adhesive member is used to bond the enclosure and the support to fit the electrode assembly.

12. The insulating bracket according to claim 11, characterized in that: The adhesive member is an adhesive tape; or, the adhesive member is arranged on the enclosure and / or the support body, so that the enclosure, the support body and the adhesive member are integrated.

13. The insulating support according to any one of claims 1 to 5, characterized in that: The thickness of the support body at the opening end of the accommodating cavity is 0.4-2.0 mm.

14. The insulating support according to any one of claims 1 to 5, characterized in that: The insulating bracket is made of PET, PP or LCP.

15. A battery cell, characterized in that: include: An electrode assembly, comprising a main body and a tab connected to the main body; The insulating bracket according to any one of claims 1 to 14 is sleeved on the electrode assembly, and the electrode tab is inserted through the avoidance opening; The shell has a containing space with one end open, and the insulating bracket is arranged in the containing space.

16. The battery cell according to claim 15, characterized in that: The battery cell further comprises: An end cap assembly is arranged at the open end of the shell, and a hot melt zone is formed on the enclosure and / or the support body for connecting with the end cap assembly.

17. A battery device, characterized in that: include: The battery cell according to claim 15 or 16.

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