Battery

Abstract

A battery (100), comprising a housing (110), a battery cell (120), and a bonding member (130). The housing (110) comprises a body (112) and a housing cover (113). The body (112) is provided with an accommodation cavity (111) for accommodating the battery cell (120) and the bonding member (130). The accommodation cavity (111) is provided with an opening, and the housing cover (113) is fitted to the opening. The bonding member (130) is bonded to the battery cell (120), and the bonding member (130) covers at least part of the battery cell (120). The side wall of the housing (110) is provided with a recess (140), and the projection of the recess (140) in the thickness direction of the housing (110) does not overlap with the projection of the bonding member (130) in the thickness direction of the housing (110). The present application enables explosion-proof valves to be more easily opened.

Description

Battery

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 26, 2023, with application number 2023235805513 and application name “Battery”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to batteries. Background Art

[0003] As the market demand for battery capacity continues to increase, the gas production and short circuit risks of batteries during use are also increasing. In order to prevent the explosion caused by battery failure and cause harm to users, an explosion-proof valve is designed to release pressure when the battery fails.

[0004] Currently, existing batteries, including a battery casing and a battery module disposed inside a battery pack, generally have an explosion-proof valve disposed in the battery casing to improve the pressure balance between the inside and outside of the battery casing in order to ensure the safety of the battery.

[0005] However, the battery in the prior art, due to the use of a traditional explosion-proof valve structure, may fail to start, or start slowly, resulting in the explosion of the battery cell.

[0006] Application Contents

[0007] The embodiment of the present application provides a battery that makes it easier to open the explosion-proof valve.

[0008] The present application provides a battery, including a shell, a battery cell, and an adhesive member. The shell includes a body and a shell cover. The body has a receiving cavity for receiving the battery cell and the adhesive member. The receiving cavity has an opening, and the shell cover is buckled on the opening.

[0009] The adhesive member is bonded to the battery core, and the adhesive member covers at least a portion of the battery core;

[0010] A groove is provided on the side wall of the shell, and a projection of the groove in the thickness direction of the shell does not overlap with a projection of the adhesive member in the thickness direction of the shell.

[0011] Through the above arrangement, that is, through the position design of the groove, it is possible to avoid being fixed by the glue on the bonding member, thereby making it easier to open the explosion-proof valve.

[0012] In some optional embodiments, the groove is provided on the housing cover and is located on a side of the housing cover facing away from the battery cell.

[0013] In some optional embodiments, the battery further includes a pole terminal, and the groove is provided at an opposite end of the pole terminal.

[0014] In some optional embodiments, the battery further comprises: an insulating member located on a side surface of the battery cell, wherein a projection of the insulating member in the first direction at least partially overlaps with a projection of the groove in the first direction.

[0015] In some optional embodiments, the housing includes a first end portion, and a distance from the first end portion to an intersection of diagonals of the housing is smaller than a distance from other ends of the housing to an intersection of diagonals of the housing;

[0016] The groove is located at the edge of the first end portion.

[0017] In some optional embodiments, the groove includes a first groove segment and a second groove segment, and the shell cover includes a first shell cover edge and a second shell cover edge connected to each other;

[0018] The first groove section is parallel to the first shell cover edge; and / or,

[0019] The second groove section is parallel to the second housing cover edge.

[0020] In some optional embodiments, the bonding member includes a first bonding edge and a second bonding edge, and the first groove segment is parallel to the first bonding edge; and / or,

[0021] The second groove section is parallel to the second bonding edge.

[0022] In some optional embodiments, the groove further includes an arcuate groove segment, opposite ends of the arcuate groove segment are respectively connected to the ends of the first groove segment and the second groove segment, and the arcuate groove segment faces the center of the shell cover.

[0023] In some optional embodiments, the depths of the first groove segment and the second groove segment are both smaller than the depth of the arc-shaped groove segment.

[0024] In some optional embodiments, the depth of the arcuate groove segment is 1 / 2-2 / 3 of the thickness of the shell wall; and / or,

[0025] The depths of the first groove section and the second groove section are both 1 / 3-1 / 2 of the shell cover wall thickness.

[0026] In some optional embodiments, the center of the arcuate groove segment, the center of the connection between the first shell cover edge and the second shell cover edge of the shell cover, and the center of the connection between the first bonding edge and the second bonding edge of the bonding member are the same.

[0027] In some optional embodiments, the distance between the side of the first groove segment facing the first shell cover edge and the first shell cover edge is in the range of 1 mm to 6 mm; and / or,

[0028] The distance between the side of the second groove segment facing the second shell cover edge and the second shell cover edge is in the range of 1 mm to 6 mm.

[0029] In some optional embodiments, the distance between the side of the first groove segment facing the first bonding edge and the first bonding edge is in the range of 3 mm to 6 mm; and / or

[0030] The distance between the side of the second groove segment facing the second bonding edge and the second bonding edge is in the range of 3 mm to 6 mm.

[0031] In some optional embodiments, the length of the first groove section ranges from 5 mm to 10 mm; and / or,

[0032] The length of the second groove section ranges from 5 mm to 10 mm.

[0033] In some optional embodiments, the ratio of the radius of the arc groove segment, the radius of the arc line of the shell cover end, and the radius of the arc segment of the bonding piece is (1-2): (0.5-1): (0.25-0.5).

[0034] In some optional embodiments, the ratio of the distance between the groove and the center point of the diagonal line of the shell to the width dimension of the shell ranges from 1 / 2 to 2 / 3.

[0035] In some optional embodiments, the distance between the groove and the edge of the bonding member is greater than the distance between the groove and the edge of the shell cover.

[0036] In some optional embodiments, there are at least two adhesive members, and the at least two adhesive members are bonded to opposite sides of the battery cell;

[0037] The at least two adhesive members include a first adhesive member and a second adhesive member. The thickness of the first adhesive member and the second adhesive member ranges from 0.01 mm to 0.03 mm, and the adhesive force after being soaked in electrolyte is 0.3 N / MM to 0.6 N / MM.

[0038] In some optional embodiments, the thickness of the bonding member is 1 / 3-2 / 3 of the thinnest part of the groove.

[0039] The battery provided in the present application includes a shell, a battery cell and an adhesive. The shell includes a body and a shell cover. The body has a accommodating cavity for accommodating the battery cell and the adhesive. The accommodating cavity has an opening, and the shell cover is snapped on the opening; the adhesive is bonded to the battery cell, and the adhesive covers at least part of the battery cell; a groove is provided on the side wall of the shell, and the projection of the groove in the thickness direction of the shell does not overlap with the projection of the adhesive in the thickness direction of the shell.

[0040] The position design of the groove can prevent it from being fixed by the glue on the adhesive, making it easier to open the explosion-proof valve and improving the timeliness of the pressure relief of the groove. At the same time, it can also prevent the adhesive from driving the groove during the falling process of the battery cell, causing the groove to break prematurely, thereby causing the battery cell to fail prematurely. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0042] FIG1 is a schematic structural diagram of a battery provided in an embodiment of the present application;

[0043] FIG2 is a schematic diagram of a partial structure of a battery provided in an embodiment of the present application;

[0044] FIG3 is a schematic structural diagram of a shell cover in a battery provided in an embodiment of the present application;

[0045] FIG4 is a partial enlarged view of point I in FIG3 .

[0046] Description of reference numerals:

[0047] 100-battery;

[0048] 110-housing;

[0049] 1101-first end;

[0050] 111-accommodation chamber;

[0051] 112-Ontology;

[0052] 113-shell cover;

[0053] 1131-first shell cover edge;

[0054] 1132-Second shell cover edge;

[0055] 120-battery cells;

[0056] 130-bonding parts;

[0057] 131-first bonding edge;

[0058] 132 - second bonding edge;

[0059] 140-groove;

[0060] 141-first groove section;

[0061] 142-second groove segment;

[0062] 143-arc groove segment;

[0063] 150-pole end;

[0064] 160-Insulation parts. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. All other embodiments obtained are within the scope of protection of this application. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0066] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present application.

[0067] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," and the like should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; they may refer to direct connections or indirect connections through an intermediate medium; they may refer to the communication between the internal cavities of two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0068] It should be noted that, in the description of this application, the terms "first," "second," and "third" are used solely to facilitate the description of different cavity components and should not be understood to indicate or imply a sequential relationship, relative importance, or implicitly specify the number of technical features indicated. Therefore, features defined as "first," "second," or "third" may explicitly or implicitly include at least one of these features.

[0069] At present, existing batteries, including battery casings and battery modules arranged inside the battery pack, generally have explosion-proof valves arranged in the battery casings to improve the pressure balance between the inside and outside of the battery casing in order to ensure the safety of the batteries. However, the applicant found that the batteries in the prior art, due to the use of traditional explosion-proof valve structures, have the phenomenon of being unable to start. The main reasons are: first, the position of the explosion-proof valve is not conducive to the opening of the explosion-proof valve, resulting in failure of the explosion-proof valve; second, the battery cell fixing glue inside the battery overlaps with the explosion-proof notch, resulting in the explosion-proof valve being fixed by the glue when it is started, resulting in the explosion-proof valve being unable to open. The third is: when the battery has not failed, the battery explosion-proof valve and the battery cell fixing glue overlap. When the battery falls, if the battery cell shakes, it will drive the adhesive tape to pull open the explosion-proof valve, resulting in battery failure; the fourth point: the trajectory of the explosion-proof notch is not designed reasonably, resulting in the explosion-proof valve being unable to open in time.

[0070] In order to overcome the defects in the prior art, the battery provided in the present application can avoid being fixed by the glue on the adhesive part through the position design of the groove, thereby making it easier to open the explosion-proof valve.

[0071] The contents of this application will be described in detail below with reference to the accompanying drawings so that those skilled in the art can understand the contents of this application more clearly and in detail.

[0072] Figure 1 is a schematic diagram of the structure of the battery provided in an embodiment of the present application, Figure 2 is a schematic diagram of the partial structure of the battery provided in an embodiment of the present application, Figure 3 is a schematic diagram of the structure of the shell cover in the battery provided in an embodiment of the present application, and Figure 4 is a partial enlarged view of point I in Figure 3.

[0073] As shown in Figures 1 to 4, an embodiment of the present application provides a battery 100, including a housing 110, a battery cell 120, and an adhesive member 130. The housing 110 includes a body 112 and a cover 113. The body 112 has an accommodating cavity 111 for accommodating the battery cell 120 and the adhesive member 130. The accommodating cavity 111 has an opening, and the cover 113 is snapped onto the opening.

[0074] In some examples, the body 112 and the cover 113 may be connected in a fixed or detachable manner.

[0075] Illustratively, the body 112 and the shell cover 113 are connected in a detachable manner, so that the shell cover 113 can be installed and removed, making it easy to use and maintain the shell cover 113.

[0076] It should be noted that when the internal pressure of the battery 100 is too high, the heat diffusion inside the battery cell 120 reaches a certain pressure, which compresses the groove 140, causing the groove 140 to deform under a certain pressure. After deformation, the groove 140 gradually explodes to release pressure.

[0077] The adhesive member 130 is bonded to the battery cell 120 , and the adhesive member 130 covers at least a portion of the battery cell 120 ;

[0078] It should be noted that the battery cell 120 has two sides, a front side and a back side, wherein adhesive members 130 are bonded to both sides of the battery cell 120 to install the battery cell 120 into the housing 110 .

[0079] In order to improve the stability of the battery cell 120 and increase the contact area between the adhesive member 130 and the battery cell 120 , the adhesive member 130 is generally a sheet-like structure, covering the middle area of ​​the battery cell 120 .

[0080] A groove 140 is defined on the side wall of the housing 110 , and a projection of the groove 140 in the thickness direction of the housing 110 does not overlap with a projection of the adhesive member 130 in the thickness direction of the housing 110 .

[0081] It is understandable that the function of the accommodating cavity 111 is to accommodate the battery cell 120 . It is also understandable that the accommodating cavity 111 is in a sealed state to prevent side reactions in the internal system of the battery cell 120 from occurring, thereby affecting the performance of the battery cell 120 .

[0082] It should be noted that the projection of the groove 140 in the thickness direction of the shell 110 does not overlap with the projection of the adhesive 130 in the thickness direction of the shell 110. This can effectively solve the problem that the explosion-proof valve cannot be opened because the adhesive 130 inside the battery 100 overlaps with the groove 140, resulting in the explosion-proof valve being fixed by the glue on the adhesive 130 when it is to be activated.

[0083] Through the above-mentioned arrangement, that is, through the position design of the groove 140, it is possible to avoid being fixed by the glue on the adhesive 130, thereby making it easier to open the explosion-proof valve, improving the timeliness of the pressure relief of the groove. At the same time, it can also prevent the adhesive from driving the groove during the falling process of the battery cell, causing the groove to break in advance, thereby causing the battery cell to fail in advance.

[0084] The size of the housing 110 can be set according to actual needs, and the embodiment of the present application does not impose any additional restrictions thereon.

[0085] In some examples, the housing 110 may be a metal member, and its material may include one or more of copper, iron, aluminum, tin, and lead. The casting mold may be made of sand, metal, or ceramic.

[0086] In other examples, the housing 110 may be made of plastic. During injection molding, molten plastic is injected into a plastic product mold under pressure, and then cooled and molded to obtain the desired plastic part.

[0087] The injection molding process can be completed by a mechanical injection molding machine, and the material of the shell 110 can include one or more of polyethylene, polypropylene, ABS (a terpolymer of acrylonitrile (A), butadiene (B), and styrene (S)), polyamide, and polystyrene.

[0088] It should be noted that the specific material of the housing 110 is not excessively limited in the embodiment of the present application.

[0089] Of course, during manufacturing, the housing 110 can also be made of steel plates, plastics or synthetic materials while ensuring strength.

[0090] In addition, it should be noted that this embodiment does not limit the shape of the shell 110. For example, the shell 110 can be in a regular shape such as a cuboid or a cylinder. Of course, the shell 110 can also be in other irregular shapes.

[0091] For example, the size or shape of the accommodating cavity 111 matches the size and shape of the battery cell 120 . Specifically, corresponding adjustments can be made according to actual conditions, and the embodiments of the present application do not impose any additional restrictions thereon.

[0092] In some optional embodiments, the groove 140 is provided on the housing cover 113 and is located on a side of the housing cover 113 facing away from the battery cell 120 .

[0093] It is understandable that the groove 140 is engraved on the shell cover 113 to facilitate subsequent explosion and further facilitate pressure relief.

[0094] In some examples, the width of the groove opening of the groove 140 is greater than the width of the groove bottom of the groove 140 .

[0095] It is understandable that the shape design of the groove 140 facilitates better bursting and improves the timeliness of pressure relief.

[0096] In some examples, the cross-section of the groove 140 is triangular. Of course, it can also be other shapes. Specifically, the embodiments of the present application are not too restrictive here.

[0097] In some optional embodiments, the battery 100 further includes a terminal end 150, and the groove 140 is provided at an end opposite the terminal end 150. This embodiment prevents the groove 140 from interfering with the terminal end 150, preventing the terminal end 150 from falling off, and reducing the difficulty of manufacturing. Furthermore, this embodiment solves the problem of the explosion-proof valve being blocked when the explosion-proof valve is opened due to the large number of components assembled inside the terminal end 150, resulting in a small amount of free space inside the terminal end. This also solves the problem of the explosion-proof valve failing due to the location of the explosion-proof valve being unfavorable for opening.

[0098] In some optional embodiments, the battery 100 further includes: an insulating member 160 located on the side of the battery cell 120, wherein the projection of the insulating member 160 in the first direction at least partially overlaps with the projection of the groove 140 in the first direction, so that when the pressure inside the shell is unbalanced, the insulating member 160 can act on the groove to accelerate the explosion and pressure relief of the groove.

[0099] It should be noted that A represents a first direction, as specifically shown in FIG. 1 , where the first direction may refer to a thickness direction of the battery 100 .

[0100] In some optional embodiments, the shell 110 includes a first end 1101, and the distance from the first end 1101 to the intersection of the diagonals of the shell 110 is less than the distance from the other ends of the shell 110 to the intersection of the diagonals of the shell 110; the groove 140 is located at the edge of the first end 1101. Since battery deformation generally occurs first at the center point of the diagonal of the shell cover, arranging the groove at a distance from the center point of the diagonal of the shell cover facilitates the use of the shell cover deformation to pull the groove open to play an explosion-proof role, thereby effectively solving the problem that the location of the groove is not conducive to the opening of the groove, resulting in the failure of the groove. As shown in Figures 1 to 4, in some optional embodiments, the groove 140 is located at the edge of the diagonal of the shell cover 113 and surrounds the outside of the center of the shell cover 113.

[0101] It should be noted that the position of the groove 140 is set at the end position of the battery 100 where the distance from the center point of the diagonal of the battery shell cover 113 is the smallest. The distance between the groove 140 at the end and the center point of the diagonal of the battery shell cover 113 is the smallest. Since the deformation of the battery 100 generally first occurs at the center point of the diagonal of the shell cover 113, setting the groove 140 at the center point of the diagonal of the shell cover 113 makes it easy to use the deformation of the shell cover 113 to pull open the groove 140 to play an explosion-proof role. Therefore, it effectively solves the problem that the position of the explosion-proof valve is not conducive to the opening of the explosion-proof valve, resulting in failure of the explosion-proof valve.

[0102] In some embodiments, the ratio of the distance between the groove 140 and the center point of the diagonal line of the shell cover 113 to the width of the shell cover 113 is about 1 / 2-2 / 3, because the shell 110 is most severely deformed in this area, which is more conducive to opening the explosion-proof valve as soon as possible.

[0103] As shown in FIG3 , it should be noted that A / B / C are the shortest distances from the midpoint of the diagonal to the shell cover 113 excluding the terminal lead-out end, and W is the widest side of the battery 100 .

[0104] In some optional embodiments, the groove 140 includes a first groove section 141 and a second groove section 142 , and the shell cover 113 includes a first shell cover edge 1131 and a second shell cover edge 1132 connected to each other;

[0105] The first groove section 141 and the first shell cover edge 1131 are arranged correspondingly to each other, and the first groove section 141 is parallel to the first shell cover edge 1131; and / or, the second groove section 142 and the second shell cover edge 1132 are arranged correspondingly to each other, and the second groove section 142 is parallel to the second shell cover edge 1132.

[0106] It should be noted that the first groove segment 141 and the second groove segment 142 are two groove segments on the edge of the groove 140, and the first shell cover edge 1131 and the second shell cover edge 1132 are two edges on the edge of the shell cover 113, wherein the first groove segment 141 and the first shell cover edge 1131, and the second groove segment 142 and the second shell cover edge 1132 are parallel to and correspond to each other.

[0107] In addition, it should be noted that the first groove section 141 and the second groove section 142 can make the groove 140 explode from two different directions, thereby making it easier to open the explosion-proof valve.

[0108] In some examples, the first groove segment 141 and the second groove segment 142 may each be a straight line segment.

[0109] In some optional embodiments, the bonding member 130 includes a first bonding edge 131 and a second bonding edge 132, the first groove section 141 and the first bonding edge 131 are arranged corresponding to each other, and the first groove section 141 is parallel to the first bonding edge 131; and / or the second groove section 142 and the second bonding edge 132 are arranged corresponding to each other, and the second groove section 142 is parallel to the second bonding edge 132.

[0110] It should be noted that the first bonding edge 131 and the second bonding edge 132 are two edges of the adhesive member 130 , wherein the first groove section 141 and the first bonding edge 131 , and the second groove section 142 and the second bonding edge 132 are parallel to and correspond to each other.

[0111] In addition, it should be noted that the first groove section 141 , the first bonding edge 131 and the first shell cover edge 1131 correspond to each other and are parallel to each other, wherein the first groove section 141 is located between the first bonding edge 131 and the first shell cover edge 1131 .

[0112] Correspondingly, the second groove section 142 , the second bonding edge 132 and the second shell cover edge 1132 correspond to each other and are parallel to each other, wherein the second groove section 142 is located between the second bonding edge 132 and the second shell cover edge 1132 .

[0113] As shown in Figures 1 to 4, in some optional embodiments, the groove 140 also includes an arcuate groove segment 143, the opposite ends of the arcuate groove segment 143 are respectively connected to the ends of the first groove segment 141 and the second groove segment 142, and the arcuate groove segment 143 faces the center of the shell cover 113.

[0114] It should be noted that the arc-shaped groove segment 143 is located between the first groove segment 141 and the second groove segment 142 and is used to connect the first groove segment 141 and the second groove segment 142 .

[0115] In some optional embodiments, the depths of the first groove segment 141 and the second groove segment 142 are both smaller than the depth of the arc-shaped groove segment 143 .

[0116] In some optional embodiments, the depth of the arcuate groove segment 143 is 1 / 2-2 / 3 of the wall thickness of the shell cover 113; and / or,

[0117] The depth of the first groove section 141 and the second groove section 142 are both 1 / 3-1 / 2 of the wall thickness of the shell cover 113 .

[0118] It should be noted that the first groove section 141 and the second groove section 142 serve to guide the opening of the arc-shaped groove section 143, which can effectively solve the problem that the explosion-proof valve cannot be opened in time due to unreasonable groove trajectory design.

[0119] In some optional embodiments, the center of the arcuate groove segment 143, the center of the connection between the first shell cover edge 1131 and the second shell cover edge 1132 of the shell cover 113, and the center of the connection between the first bonding edge 131 and the second bonding edge 132 of the adhesive 130 are the same.

[0120] It should be noted that such a design can better and effectively solve the problem that the explosion-proof valve cannot be opened in time due to the unreasonable design of the trajectory of the groove 140.

[0121] In some optional embodiments, the first groove segment 141 , the second groove segment 142 , and the arcuate groove segment 143 transition smoothly.

[0122] It should be noted that by setting the first groove segment 141, the second groove segment 142 and the arc-shaped groove segment 143 to be integrally formed, not only can the connection strength between the first groove segment 141, the second groove segment 142 and the arc-shaped groove segment 143 be improved, but also the first groove segment 141, the second groove segment 142 and the arc-shaped groove segment 143 can be seamlessly connected, thereby reducing the risk of cracking at the connection position of the first groove segment 141, the second groove segment 142 and the arc-shaped groove segment 143.

[0123] It should be noted that, in some embodiments, the first groove segment 141, the second groove segment 142, and the arcuate groove segment 143 are connected in an integral manner; in other embodiments, the first groove segment 141, the second groove segment 142, and the arcuate groove segment 143 may also be connected in other manners. As long as the connection method can fix the first groove segment 141, the second groove segment 142, and the arcuate groove segment 143, the purpose of this embodiment can be achieved. Here, there is no restriction on the connection method of the first groove segment 141, the second groove segment 142, and the arcuate groove segment 143.

[0124] In some optional embodiments, the distance between the side of the first groove section 141 facing the first shell cover edge 1131 and the first shell cover edge 1131 ranges from 1 mm to 6 mm; and / or,

[0125] In some examples, the distance between the side of the first groove section 141 facing the first shell cover edge 1131 and the first shell cover edge 1131 is 1 mm, 2 mm, 3 mm, 4 mm, 5 mm or 6 mm, or other specific embodiments of the present application are not too limited here.

[0126] The distance between the side of the second groove section 142 facing the second housing cover edge 1132 and the second housing cover edge 1132 is in the range of 1 mm to 6 mm.

[0127] In some examples, the distance between the side of the second groove section 142 facing the second shell cover edge 1132 and the second shell cover edge 1132 is 1 mm, 2 mm, 3 mm, 4 mm, 5 mm or 6 mm, or other specific embodiments of the present application are not too limited here.

[0128] In some optional embodiments, the distance between the side of the first groove section 141 facing the first bonding edge 131 and the first bonding edge 131 is in the range of 3 mm to 6 mm; and / or,

[0129] In some examples, the distance between the side of the first groove segment 141 facing the first bonding edge 131 and the first bonding edge 131 is 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm or 6 mm, or other specific embodiments of the present application are not too limited here.

[0130] The distance between the side of the second groove section 142 facing the second bonding edge 132 and the second bonding edge 132 is in the range of 3 mm to 6 mm.

[0131] In some examples, the distance between the side of the second groove section 142 facing the second bonding edge 132 and the second bonding edge 132 is 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm or 6 mm, or other specific embodiments of the present application are not too limited here.

[0132] It should be noted that this can effectively prevent the battery 100 from failing because the explosion-proof valve of the battery 100 overlaps with the adhesive 130 of the battery cell 120. When the battery 100 falls, if the battery cell 120 shakes, the adhesive 130 will pull open the explosion-proof valve, causing the battery 100 to fail.

[0133] In some optional embodiments, the length of the first groove segment 141 ranges from 5 mm to 10 mm;

[0134] In some examples, the length of the first groove segment 141 is 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm, or other lengths. Specifically, the embodiments of the present application are not too restrictive.

[0135] The length of the second groove section 142 ranges from 5 mm to 10 mm.

[0136] In some examples, the length of the second groove segment 142 is 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm, or other lengths. Specifically, the embodiments of the present application are not too restrictive.

[0137] In some optional embodiments, the ratio of the radius of the arc groove segment 143, the radius of the arc line at the end of the shell cover 113 and the radius of the arc segment of the adhesive 130 is (1-2): (0.5-1): (0.25-0.5).

[0138] It should be noted that this is done to better reduce the impact of the adhesive 130 on the explosion-proof valve and to avoid damage to the explosion-proof valve during welding of the shell cover 113 .

[0139] In some optional embodiments, the ratio of the distance between the groove 140 and the center point of the diagonal line of the housing 110 to the width of the housing 110 ranges from 1 / 2 to 2 / 3.

[0140] It should be noted that, because the shell 110 in this area is most severely deformed, it is more conducive to opening the explosion-proof valve at the first time.

[0141] In some optional embodiments, the distance between the groove 140 and the edge of the adhesive member 130 is greater than the distance between the groove 140 and the edge of the shell cover 113. This is to prevent the adhesive member 130 from being too close to the groove 140 and affecting the opening of the explosion-proof valve.

[0142] In some optional embodiments, there are at least two adhesive members 130 , and the at least two adhesive members 130 are bonded to opposite sides of the battery cell 120 ;

[0143] The at least two adhesive members 130 include a first adhesive member 130 and a second adhesive member 130 . The thickness of the first adhesive member 130 and the second adhesive member 130 ranges from 0.01 mm to 0.03 mm, and the adhesive force after being soaked in electrolyte is 0.3 N / MM to 0.6 N / MM.

[0144] In some optional embodiments, the thickness of the adhesive member 130 is 1 / 3-2 / 3 of the thinnest portion of the groove 140 .

[0145] The battery provided in an embodiment of the present application includes a shell, a battery cell and an adhesive member. The shell includes a body and a shell cover. The body has a accommodating cavity for accommodating the battery cell and the adhesive member. The accommodating cavity has an opening, and the shell cover is snapped on the opening; the adhesive member is bonded to the battery cell, and the adhesive member covers at least part of the battery cell; a groove is provided on the side wall of the shell, and the projection of the groove in the thickness direction of the shell does not overlap with the projection of the adhesive member in the thickness direction of the shell.

[0146] The position design of the groove can prevent it from being fixed by the glue on the adhesive, making it easier to open the explosion-proof valve and improving the timeliness of the pressure relief of the groove. At the same time, it can also prevent the adhesive from driving the groove during the falling process of the battery cell, causing the groove to break prematurely, thereby causing the battery cell to fail prematurely.

[0147] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that, Including shell, battery core and bonding parts, The shell comprises a body and a shell cover, the body has a receiving cavity for receiving the battery core and the adhesive, the receiving cavity has an opening, and the shell cover is buckled on the opening; The adhesive member is bonded to the battery core, and the adhesive member covers at least a portion of the battery core; A groove is provided on the side wall of the shell, and a projection of the groove in the first direction of the shell does not overlap with a projection of the bonding member in the thickness direction of the shell.

2. The battery according to claim 1, characterized in that, The groove is arranged on the shell cover and is located on a side of the shell cover away from the battery core.

3. The battery according to claim 1, wherein, The battery further comprises a pole terminal, and the groove is arranged at the opposite end of the pole terminal.

4. The battery according to claim 1, characterized in that, The battery further includes: an insulating member located on a side surface of the battery cell, wherein a projection of the insulating member in a first direction at least partially overlaps with a projection of the groove in the first direction.

5. The battery according to claim 1, characterized in that, The shell comprises a first end, wherein a distance from the first end to an intersection of diagonals of the shell is smaller than a distance from other ends of the shell to an intersection of diagonals of the shell; The groove is located at an edge of the first end portion.

6. The battery according to any one of claims 1-5, characterized in that, The groove includes a first groove section and a second groove section, and the shell cover includes a first shell cover edge and a second shell cover edge connected to each other; The first groove section is parallel to the first shell cover edge; and / or, The second groove section is parallel to the second shell cover edge.

7. The battery according to claim 6, characterized in that, The bonding member comprises a first bonding edge and a second bonding edge, the first groove section is parallel to the first bonding edge; and / or, The second groove section is parallel to the second bonding edge.

8. The battery according to claim 7, wherein, The groove further includes an arc-shaped groove segment, opposite ends of which are respectively connected to ends of the first groove segment and the second groove segment, and the arc-shaped groove segment faces the center of the shell cover.

9. The battery according to claim 8, characterized in that, The first groove segment is smaller than the depth of the arc-shaped groove segment; and / or, The depth of the second groove segment is smaller than the depth of the arc-shaped groove segment.

10. The battery according to claim 9, characterized in that, The depth of the arc-shaped groove segment is 1 / 2-2 / 3 of the thickness of the shell cover wall; and / or, The depths of the first groove section and the second groove section are both 1 / 3-1 / 2 of the thickness of the shell cover wall.

11. The battery according to claim 8, characterized in that, The center of the arc-shaped groove segment, the center of the connection between the first shell cover edge and the second shell cover edge of the shell cover, and the center of the connection between the first bonding edge and the second bonding edge of the bonding member are the same.

12. The battery according to claim 6, characterized in that, The distance between the side of the first groove segment facing the first shell cover edge and the first shell cover edge is in the range of 1 mm to 6 mm; and / or, The distance between the side of the second groove section facing the second shell cover edge and the second shell cover edge is in the range of 1 mm to 6 mm.

13. The battery according to claim 7, wherein The distance between the side of the first groove section facing the first bonding edge and the first bonding edge is in the range of 3 mm to 6 mm; and / or The distance between the side edge of the second groove segment facing the second bonding edge and the second bonding edge is in the range of 3 mm to 6 mm.

14. The battery according to claim 6, wherein The length of the first groove section ranges from 5 mm to 10 mm; and / or, The length of the second groove section ranges from 5 mm to 10 mm.

15. The battery according to claim 8, characterized in that, The ratio of the radius of the arc-shaped groove section, the radius of the arc of the end of the shell cover, and the radius of the arc section of the bonding member is (1-2):(0.5-1):(0.25-0.5).

16. The battery according to any one of claims 1-5, characterized in that, The ratio range of the distance from the groove to the center point of the diagonal of the shell to the width dimension of the shell is 1 / 2 to 2 / 3.

17. The battery according to any one of claims 1-5, characterized in that, The distance between the groove and the edge of the bonding member is greater than the distance between the groove and the edge of the shell cover.

18. The battery according to any one of claims 1-5, characterized in that, The thickness range of the bonding member is 0.01mm-0.03mm, and / or The adhesive force of the bonding member after soaking in the electrolyte is 0.3N / MM-0.6N / MM.

19. The battery according to any one of claims 1-5, characterized in that, The thickness of the bonding member is 1 / 3-2 / 3 of the thinnest part of the groove.

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