Battery cell and battery pack

Abstract

The utility model discloses a single battery and a battery pack. The single battery comprises a shell, an electrode assembly, a top cover, an insulating part, a pole and an insulating film, the electrode assembly is arranged in the shell; the top cover is connected with one end, in the height direction, of the shell, a liquid injection hole is formed in the top cover, and an anti-explosion valve is arranged on the top cover; the insulating part is positioned on one side of the top cover facing the electrode assembly; one part of the pole sequentially penetrates through the top cover and the insulating part along the height direction; the insulating film covers the electrode assembly, the insulating film comprises a first covering part, the first covering part is located between the insulating part and the electrode assembly in the height direction, an avoiding hole is formed in the first covering part in the height direction in a penetrating mode, and a part of the pole penetrates through the avoiding hole to be electrically connected with the electrode assembly; in the height direction, the projection of the hole wall of the liquid injection hole and the projection of the anti-explosion valve on the plane where the insulating part is located are overlapped with the projection of the first wrapping part on the plane where the insulating part is located. According to the battery monomer, the safety of the battery monomer can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer and a battery pack. BACKGROUND

[0002] Battery monomers are widely used in the field of new energy, such as electric vehicles, new energy vehicles, etc. New energy vehicles and electric vehicles have become a new trend in the development of the automobile industry.

[0003] The existing battery monomer has the problem of low safety. UTILITY MODEL CONTENT

[0004] Therefore, the present application aims to overcome the deficiencies in the prior art and provide a battery monomer that can improve the safety of the battery monomer.

[0005] The present application also provides a battery pack.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0007] According to the battery monomer of the first aspect of the present application, the battery monomer has intersecting length and height directions, and comprises a shell, an electrode assembly arranged in the shell, a top cover connected to one end of the shell along the height direction, the top cover being provided with a liquid injection hole and an explosion-proof valve, an insulating piece located on the side of the top cover facing the electrode assembly, a pole, a part of the pole being sequentially arranged in the top cover and the insulating piece along the height direction and being arranged in the length direction away from the liquid injection hole and the explosion-proof valve, and an insulating film covering the electrode assembly, the insulating film comprising a first covering part located between the insulating piece and the electrode assembly along the height direction, the first covering part being provided with a relief hole penetrating along the height direction, and a part of the pole being arranged in the relief hole and electrically connected to the electrode assembly; in the height direction, the projection of the hole wall of the liquid injection hole and the explosion-proof valve on the plane where the insulating piece is located overlaps with the projection of the first covering part on the plane where the insulating piece is located.

[0008] The battery monomer of the present application has the following advantages:

[0009] In the battery cell of the present application, the electrode assembly can be arranged in the shell, and the top cover is covered on the top of the shell, and the pole is electrically connected with the electrode assembly, so as to realize the assembly of the battery cell. When the battery cell is assembled, the insulating film is wrapped outside the electrode assembly, and the first wrapping part of the insulating film is located between the insulating part and the electrode assembly in the height direction. In this way, the top of the electrode assembly can be protected by the first wrapping part. In this process, a part of the pole can be arranged in the avoiding hole of the first wrapping part, so that the pole can be electrically connected with the electrode assembly, and the first wrapping part can avoid interfering with the electrical connection between the pole and the electrode assembly. At the same time, in the height direction, the hole wall of the injection hole and the projection of the explosion-proof valve on the plane where the insulating part is located overlap with the projection of the first wrapping part on the plane where the insulating part is located. Therefore, the injection hole and the explosion-proof valve can be isolated from the electrode assembly by the first wrapping part, so as to avoid the electrolyte injected into the shell through the injection hole directly impacting the electrode assembly, causing the diaphragm of the electrode assembly to be wrinkled, deformed or damaged, resulting in short circuit. At the same time, the explosion-proof valve can avoid directly contacting the diaphragm of the electrode assembly to pierce the diaphragm. Therefore, when the battery cell of the present application is assembled, the diaphragm of the electrode assembly can be protected from damage by various external forces by the insulating film.

[0010] According to the battery cell of the first aspect of the present application, the first wrapping part is provided with a first avoiding slot, the first avoiding slot is communicated with the avoiding hole, and in the height direction, the first avoiding slot is recessed towards the electrode assembly. The hole wall of the injection hole and the projection of the explosion-proof valve on the plane where the insulating part is located overlap with the slot wall of the first avoiding slot on the plane where the insulating part is located.

[0011] According to the battery cell of the first aspect of the present application, the first wrapping part is further provided with a second avoiding slot, the second avoiding slot is recessed towards the electrode assembly along the height direction, and the first avoiding slot is communicated with the avoiding hole through the second avoiding slot.

[0012] According to the battery cell of the first aspect of the present application, the insulating film is provided with a protruding part, the protruding part is arranged on the side of the first wrapping part close to the top cover and protrudes towards the top cover along the height direction, and the protruding part abuts against the insulating part.

[0013] According to the battery cell of the first aspect of the present application, the number of protruding parts is multiple, and multiple protruding parts are arranged to form an avoiding space. In the height direction, the projection of the explosion-proof valve on the plane where the insulating part is located overlaps with the edge of the avoiding space on the plane where the insulating part is located.

[0014] According to the battery cell of the first aspect of the present application, the first cladding part is provided with a plurality of explosion-proof gaps, and the plurality of explosion-proof gaps are arranged to form an explosion-proof space. The projection of the explosion-proof valve on the plane where the insulating part is located overlaps with the projection of the edge of the explosion-proof space on the plane where the insulating part is located in the height direction.

[0015] According to the battery cell of the first aspect of the present application, the battery cell also has a width direction intersecting with the length direction and the height direction. The first cladding part is provided with a first limiting groove at each end edge in the length direction. The first limiting groove is recessed in the height direction towards the direction close to the electrode assembly. The insulating part has a plurality of first limiting protrusions. The first limiting protrusions are protruded in the height direction towards the direction close to the electrode assembly. The plurality of first limiting protrusions are arranged in the two first limiting grooves respectively.

[0016] According to the battery cell of the first aspect of the present application, the first cladding part is provided with a second limiting groove at each end in the width direction. The second limiting groove is recessed in the height direction towards the direction close to the electrode assembly and is in communication with the first limiting groove. The insulating part has a second limiting protrusion at each end in the width direction. The second limiting protrusion is protruded in the height direction towards the direction close to the electrode assembly and is connected with the first limiting protrusion. The second limiting protrusion is arranged in the second limiting groove.

[0017] According to the battery cell of the first aspect of the present application, the insulating film further comprises a second cladding part and a first bending part. The first bending part is connected with the first cladding part through the second cladding part. The first bending part and the first cladding part are oppositely arranged in the height direction.

[0018] According to the battery pack of the second aspect of the present application, the battery pack comprises the battery cell as described above.

[0019] The battery pack of the present application has the following advantages:

[0020] In the battery pack of the present application, since the battery cell of the present application can improve the safety of the battery cell, the safety of the battery pack can be improved, so that the battery pack of the present application can have higher safety. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0022] Figure 1 An exploded structural schematic of a battery cell showing some embodiments of the present application Figure 1 ;

[0023] Figure 2 An exploded structural schematic of a battery cell showing some embodiments of the present application Figure 2 ;

[0024] Figure 3 An enlarged structural schematic of A in FIG. 1 showing some embodiments of the present application Figure 2 ;

[0025] Figure 4 An exploded structural schematic of an insulation film and insulation piece showing some embodiments of the present application

[0026] Figure 5 An enlarged structural schematic of B in FIG. 2 showing some embodiments of the present application Figure 4 ;

[0027] Figure 6 A tiled structural schematic of an insulation film showing some embodiments of the present application

[0028] Figure 7 An enlarged structural schematic of C in FIG. 3 showing some embodiments of the present application Figure 6 ;

[0029] Figure 8 A tiled structural schematic of an insulation film showing some embodiments of the present application

[0030] Figure 9 A tiled structural schematic of an insulation film showing some embodiments of the present application

[0031] Figure 10 An enlarged structural schematic of D in FIG. 4 showing some embodiments of the present application Figure 9 ;

[0032] Explanation of main element symbols:

[0033] 100 - housing

[0034] 200 - electrode assembly

[0035] 300 - top cover; 310 - liquid injection hole; 320 - explosion-proof valve

[0036] 400 - insulation piece; 410 - first limiting protrusion; 420 - second limiting protrusion

[0037] 500 - pole

[0038] 600 - Insulating film; 610 - First covering part; 611 - Avoidance hole; 612 - First avoidance groove; 613 - Second avoidance groove; 614 - Anti-explosion gap; 615 - Anti-explosion space; 616 - First limiting groove; 617 - Second limiting groove; 620 - Protruding part; 621 - Avoidance space; 630 - Second covering part; 640 - First bending part; 650 - Second bending part;

[0039] x - Length direction; y - Width direction; z - Height direction. DETAILED DESCRIPTION

[0040] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are merely for the purpose of explaining the present application, and cannot be understood as limiting the present application.

[0041] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0042] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0043] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In the present application, unless specifically stated and limited otherwise, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature is "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature is "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0045] In a power battery, the safety performance of the battery monomer is very important. In the traditional battery monomer cell structure, the electrode assembly is usually wrapped by an insulating film to separate the electrode assembly from the shell. When wrapping the electrode assembly, the electrode assembly is usually wrapped from bottom to top to avoid the positive and negative pole columns at the top of the electrode assembly. However, this wrapping method also causes the top of the electrode assembly to be at least partially exposed, so that the separator of the electrode assembly is at least partially exposed outside the insulating film, which may cause the separator of the electrode assembly to be deformed by electrolyte impact or pierced by the explosion-proof valve.

[0046] Referring to FIGS. 1 to 3, Figure 1 and Figure 2 The battery monomer related to the embodiments of the present application has intersecting length direction x and height direction z. The battery monomer includes a shell 100, an electrode assembly 200, a top cover 300, an insulating piece 400, a pole column 500 and an insulating film 600.

[0047] Specifically, the electrode assembly 200 is arranged in the shell 100; the top cover 300 is connected to one end of the shell 100 along the height direction z, the top cover 300 is provided with a liquid injection hole 310, and the top cover 300 is provided with an explosion-proof valve 320; the insulating piece 400 is located on the side of the top cover 300 facing the electrode assembly 200; a part of the pole column 500 is sequentially arranged in the top cover 300 and the insulating piece 400 along the height direction z, and is arranged to be spaced apart from the liquid injection hole 310 and the explosion-proof valve 320 along the length direction x; the insulating film 600 wraps the electrode assembly 200, and the insulating film 600 includes a first wrapping part 610, the first wrapping part 610 is located between the insulating piece 400 and the electrode assembly 200 along the height direction z, the first wrapping part 610 is provided with an avoiding hole 611 penetrating along the height direction z, and a part of the pole column 500 is arranged in the avoiding hole 611 and electrically connected to the electrode assembly 200; in the height direction z, the hole wall of the liquid injection hole 310 and the projection of the explosion-proof valve 320 on the plane where the insulating piece 400 is located overlap with the projection of the first wrapping part 610 on the plane where the insulating piece 400 is located.

[0048] It should be noted that the length direction x is Figure 1 and Figure 2The direction indicated by x is the length direction, and the height direction z is Figure 1 And Figure 2 The direction indicated by z is the height direction. The projection of the hole wall refers to the projection formed by the hole wall of the injection hole 310.

[0049] In the battery cell of the present application, the electrode assembly 200 can be arranged in the shell 100, and the top cover 300 is covered on the top of the shell 100, and the pole 500 is electrically connected with the electrode assembly 200 to realize the assembly of the battery cell. When the battery cell is assembled, since the insulating film 600 is wrapped outside the electrode assembly 200, and the first wrapping part 610 of the insulating film 600 is located between the insulating part 400 and the electrode assembly 200 along the height direction z, thus the top of the electrode assembly 200 can be protected by the first wrapping part 610, and in this process, a part of the pole 500 can be arranged in the avoiding hole 611 of the first wrapping part 610, so that the pole 500 can be electrically connected with the electrode assembly 200, avoiding the first wrapping part 610 interfering with the electrical connection between the pole 500 and the electrode assembly 200, and at the same time, along the height direction z, since the projection of the hole wall of the injection hole 310 and the explosion-proof valve 320 on the plane where the insulating part 400 is located overlaps with the projection of the first wrapping part 610 on the plane where the insulating part 400 is located, thus the injection hole 310 and the explosion-proof valve 320 can be isolated from the electrode assembly 200 by the first wrapping part 610, avoiding the electrolyte injected into the shell 100 through the injection hole 310 directly impacting the electrode assembly 200, causing the separator of the electrode assembly 200 to be wrinkled and deformed or damaged, resulting in short circuit, and at the same time, avoiding the explosion-proof valve 320 directly contacting the separator of the electrode assembly 200 to pierce the separator, thus when the battery cell of the present application is assembled, the separator of the electrode assembly 200 can be protected from being damaged by various external force factors by the insulating film 600.

[0050] Referring to Figure 2 Further, the battery cell includes two poles 500, and the two poles 500 are arranged at intervals along the first direction, one of the two poles 500 is electrically connected with the positive electrode tab of the electrode assembly 200, and the other pole 500 is electrically connected with the negative electrode tab of the electrode assembly 200, and the first wrapping part 610 is provided with two avoiding holes 611, and the two avoiding holes 611 are arranged at intervals along the length direction x, and each pole 500 is arranged in one avoiding hole 611 to avoid the electrical connection between each pole 500 and the electrode assembly 200 through the two avoiding holes 611.

[0051] Referring to Figure 6As shown, in some embodiments, the first covering portion 610 is provided with a first avoiding groove 612, the first avoiding groove 612 is in communication with the avoiding hole 611, in the height direction z, the first avoiding groove 612 is recessed towards the direction close to the electrode assembly 200, and the projection of the hole wall of the liquid injection hole 310 and the explosion-proof valve 320 on the plane where the insulating piece 400 is located overlaps with the projection of the groove wall of the first avoiding groove 612 on the plane where the insulating piece 400 is located.

[0052] In the present embodiment, in the height direction z, since the first avoiding groove 612 is recessed towards the direction close to the electrode assembly 200, and the projection of the hole wall of the liquid injection hole 310 and the explosion-proof valve 320 on the plane where the insulating piece 400 is located overlaps with the projection of the groove wall of the first avoiding groove 612 on the plane where the insulating piece 400 is located, therefore, the explosion-proof valve 320 can be accommodated in the first avoiding groove 612, at the same time, the electrolyte injected into the shell 100 through the liquid injection hole 310 can flow into the first avoiding groove 612, and since the first avoiding groove 612 is in communication with the avoiding hole 611, thus, the electrolyte can enter the inside of the shell 100 through the first avoiding groove 612 and the avoiding hole 611, in this process, the electrolyte flowing in the shell 100 can be buffered by the first avoiding groove 612, to avoid the electrolyte injected into the shell 100 through the liquid injection hole 310 directly impacting the electrode assembly 200, at the same time, the explosion-proof valve 320 can be avoided by the first avoiding groove 612, to avoid the explosion-proof valve 320 damaging the insulating film 600, and to avoid the insulating film 600 blocking the explosion-proof valve 320, further, accommodating the explosion-proof valve 320 in the first avoiding groove 612 can reduce the occupied space of the explosion-proof valve 320 in the shell 100 along the height direction z, to improve the energy density of the battery monomer.

[0053] Specifically, referring to Figure 6 As shown, further, the first avoiding groove 612 is located between the two avoiding holes 611, and the two ends of the first avoiding groove 612 are in communication with the two avoiding holes 611 respectively, so that the two pole columns 500 can be infiltrated by the electrolyte.

[0054] Referring to Figure 7 As shown, further, the first covering portion 610 is also provided with a second avoiding groove 613, the second avoiding groove 613 is recessed towards the direction close to the electrode assembly 200 along the height direction z, and the first avoiding groove 612 is in communication with the avoiding hole 611 through the second avoiding groove 613.

[0055] In this embodiment, since the second relief groove 613 is recessed towards the electrode assembly 200 along the height direction z, and the first relief groove 612 is connected to the relief hole 611 through the second relief groove 613, the first relief groove 612 and the relief hole 611 can be connected through the second relief groove 613, so that the electrolyte flowing into the first relief groove 612 through the injection hole 310 can flow into the relief hole 611 through the second relief groove 613, thereby achieving the wetting of the electrode assembly 200 by the electrolyte.

[0056] Continue to refer to Figure 7 As shown, furthermore, the battery cell also has a width direction y that intersects both the length direction x and the height direction z, i.e., as... Figure 7 In the direction indicated by y, the second clearance groove 613 extends along the length direction x, and the width of the second clearance groove 613 along the width direction y is smaller than the width of the first clearance groove 612 along the width direction y, thereby reducing the area of ​​the clearance groove opened on the first covering part 610, thereby improving the structural strength of the first covering part 610 and extending the service life of the insulating film 600.

[0057] Continue to refer to Figure 7 As shown, each clearance hole 611 is further connected to the first clearance groove 612 through a second clearance groove 613, thereby reducing the opening area of ​​the first clearance groove 612 and thus improving the structural strength of the first covering part 610.

[0058] Reference Figure 8 As shown, in some other embodiments, the insulating film 600 is provided with a protrusion 620. The protrusion 620 is disposed on the side of the first covering part 610 facing the top cover 300 along the height direction z, and protrudes towards the top cover 300 along the height direction z. The protrusion 620 abuts against the insulating member 400 along the height direction z. In the height direction z, the projection of the hole wall of the injection hole 310 and the explosion-proof valve 320 on the plane where the insulating member 400 is located is spaced apart from the projection of the protrusion 620 on the plane where the insulating member 400 is located.

[0059] In the embodiment, since the protruding portion 620 protrudes from the first covering portion 610 toward the side of the top cover 300 in the height direction z and abuts against the insulating member 400 in the height direction z, and the hole wall of the liquid injection hole 310 and the projection of the explosion-proof valve 320 on the plane where the insulating member 400 is located are spaced apart from the projection of the protruding portion 620 on the plane where the insulating member 400 is located in the height direction z, the explosion-proof valve 320 and the liquid injection hole 310 can be spaced apart from the insulating film 600 by the protruding portion 620, so as to avoid damage of the insulating film 600 by the explosion-proof valve 320 and to avoid blockage of the explosion-proof valve 320 by the insulating film 600, and a flow channel for the electrolyte can be provided to enable the electrolyte to flow into the avoidance hole 611 through the first covering portion 610. Further, the protruding portion 620 protruding from the first covering portion 610 can avoid the avoidance groove being formed on the first covering portion 610, so as to enhance the structural strength of the first covering portion 610.

[0060] With reference to Figure 8 Further, the plurality of protruding portions 620 are arranged to form the avoidance space 621, and the projection of the explosion-proof valve 320 on the plane where the insulating member 400 is located overlaps the edge of the avoidance space 621 on the plane where the insulating member 400 is located in the height direction z.

[0061] In the embodiment, since the projection of the explosion-proof valve 320 on the plane where the insulating member 400 is located overlaps the edge of the avoidance space 621 on the plane where the insulating member 400 is located in the height direction z, the explosion-proof valve 320 can be accommodated in the avoidance space 621 by the plurality of protruding portions 620, so as to avoid damage of the insulating film 600 by the explosion-proof valve 320 and to avoid blockage of the explosion-proof valve 320 by the insulating film 600, and the flow channel of the electrolyte on the first covering portion 610 can be expanded by the plurality of protruding portions 620 protruding from the first covering portion 610, so as to improve the flow of the electrolyte into the avoidance hole 611 through the first covering portion 610.

[0062] With reference to Figure 8 Further, the plurality of protruding portions 620 are arranged between the two avoidance holes 611, so as to improve the consistency of the spacing between the insulating film 600 and the top cover 300 in the height direction z, to enable the electrolyte to flow into the two avoidance holes 611 at the same time, and to enable the two pole columns 500 to be soaked by the electrolyte.

[0063] With reference to Figure 9 and Figure 10As shown, in some embodiments, the first covering part 610 is provided with a plurality of explosion-proof gaps 614, and the plurality of explosion-proof gaps 614 are arranged to form an explosion-proof space 615. The projection of the explosion-proof valve 320 on the plane where the insulating piece 400 is located overlaps the projection of the edge of the explosion-proof space 615 on the plane where the insulating piece 400 is located in the height direction z.

[0064] In the present embodiment, since the plurality of explosion-proof gaps 614 are arranged to form the explosion-proof space 615, the structural strength of the explosion-proof film in the region where the explosion-proof space 615 is located is low and is easy to be broken. Since the projection of the explosion-proof valve 320 on the plane where the insulating piece 400 is located overlaps the projection of the edge of the explosion-proof space 615 on the plane where the insulating piece 400 is located in the height direction z, when the air pressure inside the electrode assembly 200 exceeds the preset air pressure threshold, the insulating film 600 in the region where the explosion-proof space 615 is located can be broken by the air pressure, and the explosion-proof valve 320 is opened to discharge the gas, thereby preventing the electrode assembly 200 from being in thermal runaway.

[0065] Referring to Figures 3 to 5 As shown, in some embodiments, the first covering part 610 is provided with a first limiting groove 616 at each end edge in the length direction x, and the first limiting groove 616 is recessed in the height direction z towards the electrode assembly 200. The insulating piece 400 is provided with a plurality of first limiting protrusions 410, and the first limiting protrusions 410 are protruded in the height direction z towards the electrode assembly 200. The plurality of first limiting protrusions 410 are arranged in the two first limiting grooves 616, respectively.

[0066] In the present embodiment, since the first covering part 610 is provided with the first limiting groove 616 at each end edge in the length direction x, and the first limiting groove 616 is recessed in the height direction z towards the electrode assembly 200, and the first limiting protrusion 410 is protruded in the height direction z towards the electrode assembly 200, and the first limiting protrusion 410 is arranged in the first limiting groove 616, the cooperation of the first limiting protrusion 410 and the first limiting groove 616 can play a positioning role for the connection of the insulating piece 400 and the insulating film 600 in the length direction x, so as to improve the assembly accuracy of the insulating piece 400 and the insulating film 600 in the length direction x, and further improve the positioning accuracy of the top cover 300 and the insulating film 600 in the length direction x.

[0067] Continuing to refer to Figures 3 to 5As shown in FIG. 1, in some embodiments, the first covering portion 610 is provided with a second limiting groove 617 at both ends along the width direction y, the second limiting groove 617 is recessed along the height direction z towards the direction close to the electrode assembly 200, and is in communication with the first limiting groove 616. The insulating member 400 is respectively provided with a second limiting protrusion 420 at both ends along the width direction y, the second limiting protrusion 420 is protruded along the height direction z towards the direction close to the electrode assembly 200, and is connected with the first limiting protrusion 410. The second limiting protrusion 420 is arranged in the second limiting groove 617.

[0068] In the present embodiment, since the first covering portion 610 is provided with the second limiting groove 617 at both ends along the width direction y, the second limiting groove 617 is recessed along the height direction z towards the direction close to the electrode assembly 200, the second limiting protrusion 420 is protruded along the height direction z towards the direction close to the electrode assembly 200, and the second limiting protrusion 420 is arranged in the second limiting groove 617, the positioning effect for the connection between the insulating member 400 and the insulating film 600 along the width direction y can be achieved by the cooperation between the second limiting protrusion 420 and the second limiting groove 617, so as to improve the assembly accuracy between the insulating member 400 and the insulating film 600 along the width direction y, and further improve the positioning accuracy between the top cover 300 and the insulating film 600 along the width direction y.

[0069] Referring to Figure 6 , Figure 8 and Figure 9 , in some embodiments, the insulating film 600 further comprises a second covering portion 630 and a first bending portion 640, the first bending portion 640 is arranged opposite to the first covering portion 610 along the height direction z, and the first bending portion 640 is connected with the first covering portion 610 through the second covering portion 630.

[0070] In the present embodiment, since the first bending portion 640 is arranged opposite to the first covering portion 610 along the height direction z, and the first bending portion 640 is connected with the first covering portion 610 through the second covering portion 630, when the electrode assembly 200 is covered by the insulating film 600, the end of the electrode assembly 200 close to the top cover 300 along the height direction z can be covered towards the end of the electrode assembly 200 away from the top cover 300 along the height direction z, that is, from the top of the electrode assembly 200 towards the bottom of the electrode assembly 200. In this process, the first covering portion 610 is covered on the end of the electrode assembly 200 close to the top cover 300 along the height direction z, the first bending portion 640 is covered on the end of the electrode assembly 200 away from the top cover 300 along the height direction z, and the second covering portion 630 is covered on the side of the electrode assembly 200 perpendicular to the width direction y, so as to improve the protection effect of the insulating film 600 on the top of the electrode assembly 200.

[0071] Continuing to refer to Figure 6、 Figure 8 In some embodiments, as shown in Figure 9 In some embodiments, the insulating film 600 further comprises a second bending portion 650, each second covering portion 630 is connected with a second bending portion 650 on both sides along the length direction x, and among the plurality of second bending portions 650, two second bending portions 650 on the same side along the length direction x cover the same side of the electrode assembly 200 perpendicular to the length direction x, and the two second bending portions 650 at least partially overlap. In this way, the electrode assembly 200 can be fully covered by the first covering portion 610, the second covering portion 630, the first bending portion 640, and the second bending portion 650, so as to improve the protection effect of the electrode assembly 200.

[0072] Continuing to refer to Figure 6 、 Figure 8 and Figure 9 In some embodiments, the insulating film 600 further comprises a second bending portion 650, each second covering portion 630 is connected with a second bending portion 650 on both sides along the length direction x, and among the plurality of second bending portions 650, two second bending portions 650 on the same side along the length direction x cover the same side of the electrode assembly 200 perpendicular to the length direction x, and the two second bending portions 650 at least partially overlap. In this way, the electrode assembly 200 can be fully covered by the first covering portion 610, the second covering portion 630, the first bending portion 640, and the second bending portion 650, so as to improve the protection effect of the electrode assembly 200.

[0073] The battery pack disclosed in the embodiments of the present application comprises the above-mentioned battery monomer.

[0074] In the battery pack of the present application, since the battery monomer of the present application can optimize the covering mode of the electrode assembly 200, the safety of the battery monomer can be improved, so that the battery pack of the present application can have higher safety.

[0075] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description 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 appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0076] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that changes, modifications, substitutions and variations can be made by those skilled in the art without departing from the scope of the present application.

Claims

1. A battery cell, characterized in that, The battery cell has intersecting length (x) and height (z) directions, and the battery cell includes: Casing (100), An electrode assembly (200) is disposed within the housing (100); A top cover (300) is connected to one end of the housing (100) along the height direction (z). The top cover (300) is provided with a liquid injection hole (310) and an explosion-proof valve (320) is provided on the top cover (300). An insulating element (400) is located on the side of the top cover (300) facing the electrode assembly (200); A pole (500), a portion of which is sequentially inserted through the top cover (300) and the insulating member (400) along the height direction (z), and spaced apart from the injection hole (310) and the explosion-proof valve (320) along the length direction (x); and An insulating film (600) covers the electrode assembly (200). The insulating film (600) includes a first covering portion (610), which is located between the insulating member (400) and the electrode assembly (200) along the height direction (z). A clearance hole (611) is provided through the first covering portion (610) along the height direction (z). A portion of the electrode post (500) passes through the clearance hole (611) and is electrically connected to the electrode assembly (200). In the height direction (z), the projection of the wall of the injection hole (310) and the explosion-proof valve (320) on the plane where the insulating member (400) is located overlaps with the projection of the first covering portion (610) on the plane where the insulating member (400) is located.

2. The battery cell according to claim 1, characterized in that, The first covering part (610) is provided with a first clearance groove (612), which communicates with the clearance hole (611). In the height direction (z), the first clearance groove (612) is recessed towards the electrode assembly (200), and the projection of the hole wall of the injection hole (310) and the explosion-proof valve (320) on the plane where the insulating member (400) is located overlaps with the projection of the groove wall of the first clearance groove (612) on the plane where the insulating member (400) is located.

3. The battery cell according to claim 2, characterized in that, The first covering part (610) is also provided with a second relief groove (613), the second relief groove (613) is recessed along the height direction (z) towards the electrode assembly (200), and the first relief groove (612) communicates with the relief hole (611) through the second relief groove (613).

4. The battery cell according to claim 1, characterized in that, The insulating film (600) is provided with a protrusion (620), which is disposed on the side of the first covering part (610) near the top cover (300) and protrudes towards the top cover (300) along the height direction (z). The protrusion (620) abuts against the insulating member (400).

5. The battery cell according to claim 4, characterized in that, The number of protrusions (620) is multiple, and the multiple protrusions (620) are arranged to form a clearance space (621). In the height direction (z), the projection of the explosion-proof valve (320) on the plane where the insulating member (400) is located overlaps with the projection of the edge of the clearance space (621) on the plane where the insulating member (400) is located.

6. The battery cell according to claim 1, characterized in that, The first covering part (610) has a plurality of explosion-proof gaps (614), and the plurality of explosion-proof gaps (614) are arranged to form an explosion-proof space (615). In the height direction (z), the projection of the explosion-proof valve (320) on the plane where the insulating member (400) is located overlaps with the projection of the edge of the explosion-proof space (615) on the plane where the insulating member (400) is located.

7. The battery cell according to claim 1, characterized in that, The battery cell also has a width direction (y) that intersects the length direction (x) and the height direction (z) in pairs. The first covering part (610) is provided with a first limiting groove (616) at both ends of the length direction (x). The first limiting groove (616) is recessed in the direction of the height direction (z) toward the electrode assembly (200). The insulating member (400) has a plurality of first limiting protrusions (410). The first limiting protrusions (410) protrude in the direction of the height direction (z) toward the electrode assembly (200). The plurality of first limiting protrusions (410) are respectively disposed in two first limiting grooves (616).

8. The battery cell according to claim 7, characterized in that, The first covering part (610) has a second limiting groove (617) at both ends along the width direction (y). The second limiting groove (617) is recessed along the height direction (z) towards the electrode assembly (200) and communicates with the first limiting groove (616). The insulating member (400) has a second limiting protrusion (420) at both ends along the width direction (y). The second limiting protrusion (420) protrudes along the height direction (z) towards the electrode assembly (200) and connects with the first limiting protrusion (410). The second limiting protrusion (420) is disposed in the second limiting groove (617).

9. The battery cell according to claim 1, characterized in that, The insulating film (600) further includes a second covering portion (630) and a first bending portion (640), the first bending portion (640) being connected to the first covering portion (610) via the second covering portion (630), and the first bending portion (640) and the first covering portion (610) being disposed opposite to each other along the height direction (z).

10. A battery pack, characterized in that, include: The battery cell as described in any one of claims 1-9.

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