CN220553577U - Battery cell - Google Patents

Abstract

The utility model relates to the technical field of batteries and proposes a battery, which includes: an electric core; and a casing. The electric core is arranged in the casing. The casing includes a cover plate and a casing part. The casing part includes a side wall part and a bottom wall part. , the side wall part and the bottom wall part are an integrated structure, the cover plate is connected to the side wall part, and the cover plate and the bottom wall part are arranged oppositely; the pole structure is set on the bottom wall part and is connected with the electric pole Core electrical connection; insulating piece, the insulating piece is arranged between the bottom wall part and the electric core, and the insulating piece is spaced away from the case piece toward at least part of the corner area of the inner surface of the case piece, thereby preventing the insulating piece from being installed on the case piece The probability of interference during the process can also be avoided, and the safety risk of damage to the casing caused by the insulating member pressing against the corner area of the casing can be avoided, thereby effectively improving the safe performance of the battery.

Description

Battery

Technical field

The utility model relates to the field of battery technology, and in particular to a battery.

Background technique

In the related art, the battery may include a pole structure and a casing, and the pole structure and the casing may be insulated and protected by an insulating piece. However, considering the installation position restrictions of the pole structure, it may be inconvenient to install the insulating piece. question.

Utility model content

The utility model provides a battery to improve the performance of the battery.

The utility model provides a battery, which includes:

Batteries;

The shell, the battery core is arranged in the shell, the shell includes a cover plate and a shell part, the shell part includes a side wall part and a bottom wall part, the side wall part and the bottom wall part are an integral structure, the cover plate and the side wall The parts are connected, and the cover plate and the bottom wall part are arranged oppositely;

The pole structure is arranged on the bottom wall part and is electrically connected to the battery core;

The insulating member is disposed between the bottom wall part and the battery core, and the insulating member is spaced apart from the case member toward at least part of the corner area of the inner surface of the case member.

The battery in the embodiment of the present invention includes a battery core, a casing, a pole structure and an insulator. The battery core and the insulator are arranged in the casing. The pole structure is arranged on the casing. The pole structure is electrically connected to the battery core. The insulating member forms an insulating protection for the battery core and the casing. The shell includes a cover plate and a shell part, and the side wall part and the bottom wall part of the shell part are one-piece structures, and the pole structure is arranged on the bottom wall part, by making the insulating part face the corner area of the inner surface of the shell part At least part of the insulating member is spaced apart from the casing member, thereby avoiding the possibility of interference during the installation of the insulating member to the casing member, and also preventing the insulating member from pressing against the corner area of the casing member and causing damage to the casing member. risk, which can effectively improve the safe performance of the battery.

Description of drawings

For a better understanding of the disclosure, reference may be made to the embodiments illustrated in the following drawings. Parts in the drawings are not necessarily to scale, and relevant elements may be omitted in order to emphasize and clearly illustrate technical features of the present disclosure. Additionally, related elements or components may have different arrangements as is known in the art. Furthermore, in the drawings, the same reference numerals represent the same or similar components in the respective drawings. in:

Figure 1 is a schematic structural diagram of a battery according to an exemplary embodiment;

Figure 2 is a partial structural diagram of a battery according to an exemplary embodiment;

FIG. 3 is a partial cross-sectional structural diagram of a battery according to an exemplary embodiment.

The reference symbols are explained as follows:

10. Battery core; 20. Case; 21. Cover plate; 22. Case piece; 221. Side wall part; 222. Bottom wall part; 223. First arc surface; 30. Pole structure; 40. Insulation piece; 41. Avoidance through hole; 42. Second arc surface.

Detailed ways

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Therefore, it should be understood that various modifications may be made to the example embodiments without departing from the scope of the present disclosure. modifications and changes.

In the description of the present disclosure, unless otherwise expressly stated and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" is refers to two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the" object or "an" object are also intended to mean one of a possible plurality of such objects.

Unless otherwise specified or stated, the terms "connection", "fixed", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal. Connection; "Connection" can be a direct connection or an indirect connection through an intermediary. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

Further, in the description of the present disclosure, it should be understood that the directional terms such as “upper”, “lower”, “inner”, and “outer” described in the exemplary embodiments of the present disclosure are from the angle shown in the drawings. This description should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that when the context refers to one element or feature being connected to "on", "below", "in" or "outside" another element(s), it is not merely directly connected. "on", "below" or "inside" or "outside" another element (one or more), or can also be indirectly connected to another element (one or more) "on", "below" or "outside" through an intermediate element. inside and outside".

One embodiment of the present invention provides a battery. Please refer to Figures 1 to 3. The battery includes: a battery core 10; a casing 20. The battery core 10 is disposed in the casing 20. The casing 20 includes a cover 21 and a casing 20. The housing part 22 includes a side wall part 221 and a bottom wall part 222. The side wall part 221 and the bottom wall part 222 are integrally formed structures. The cover plate 21 is connected to the side wall part 221, and the cover plate 21 Arranged opposite the bottom wall part 222; pole structure 30, the pole structure 30 is arranged on the bottom wall part 222, and is electrically connected to the battery core 10; insulating member 40, the insulating part 40 is arranged on the bottom wall part 222 and the battery core 10 In between, the insulating member 40 is spaced apart from the housing member 22 toward at least part of the corner area of the inner surface of the housing member 22 .

A battery according to one embodiment of the present invention includes a battery core 10, a casing 20, a pole structure 30 and an insulator 40. The battery core 10 and the insulator 40 are disposed in the casing 20, and the pole structure 30 is disposed on the casing 20. , the pole structure 30 is electrically connected to the battery core 10 , and the insulating member 40 forms insulating protection for the battery core 10 and the casing 20 . The housing 20 includes a cover plate 21 and a housing part 22, and the side wall part 221 and the bottom wall part 222 of the housing part 22 are one-piece structures. The pole structure 30 is disposed on the bottom wall part 222, by making the insulating part 40 is spaced apart from the housing member 22 toward at least part of the corner area of the inner surface of the housing member 22, thereby avoiding the possibility of interference during the installation of the insulating member 40 to the housing member 22, and also preventing the insulating member 40 from pressing against the housing. The corner area of the body member 22 may cause safety risks of damage to the housing member 22, thereby effectively improving the safe performance of the battery.

It should be noted that, as shown in FIG. 1 , the case 20 includes a cover plate 21 and a case member 22 . The cover plate 21 and the case member 22 are connected, thereby achieving storage and protection of the battery core 10 .

The housing member 22 includes a side wall part 221 and a bottom wall part 222. The side wall part 221 and the bottom wall part 222 are an integrally formed structure, which not only ensures the structural strength of the side wall part 221 and the bottom wall part 222, but also ensures the side wall part 221 and the bottom wall part 222. The forming efficiency of the wall portion 221 and the bottom wall portion 222 further controls the manufacturing efficiency of the battery.

The cover plate 21 is connected to the side wall portion 221. For example, the cover plate 21 and the side wall portion 221 can be welded. The cover plate 21 and the side wall portion 221 can be connected by laser welding, resistance welding or ultrasonic welding.

As shown in FIG. 1 , the pole structure 30 is disposed on the bottom wall portion 222 , and the bottom wall portion 222 can be disposed opposite to the cover 21 . When the batteries are grouped, the pole structure 30 can be directed toward the top of the battery box. At this time, the cover 21 can form a support for the battery core 10. Of course, it is not excluded that the pole structure 30 faces the bottom end of the battery box.

As shown in FIG. 3 , by disposing the insulating member 40 between the bottom wall portion 222 and the battery core 10 , insulation protection between the bottom wall portion 222 and the battery core 10 can be achieved, effectively improving the safe performance of the battery.

The insulating member 40 needs to be installed into the housing member 22 through the opening of the housing member 22 , that is, the insulating member 40 needs to be installed at least to a position close to the bottom wall portion 222 . During this process, it is necessary to ensure that the insulating member 40 can be quickly installed. In the housing member 22 , therefore, by arranging the insulating member 40 to be spaced apart from the housing member 22 toward at least part of the corner area of the inner surface of the housing member 22 , it is ensured that the insulating member 40 can be in contact with the corner area of the inner surface of the housing member 22 Having a reliable gap between them not only facilitates installation, but also prevents the insulating member 40 from damaging the housing member 22, thus improving the safe performance of the battery.

In one embodiment, the corner area of the inner surface of the housing member 22 includes a first curved surface, which can reduce the problem of stress concentration in the corner area of the inner surface of the housing member 22, thereby effectively improving the structural safety performance of the housing 20. Corner areas of the lower housing part 22 are subject to damage due to stress concentrations.

In one embodiment, the corner area of the inner surface of the housing member 22 includes a first arc surface 223, which not only facilitates the molding of the housing member 22, but also reduces stress concentration in the corner area of the housing member 22. The safety performance of the housing 20 is improved.

In one embodiment, the surface of the insulating member 40 facing the corner area of the inner surface of the housing member 22 includes a second curved surface, which not only ensures that at least part of the corner area of the insulating member 40 facing the inner surface of the housing member 22 is spaced apart from the housing member 22 , and can effectively prevent the corner area of the insulating member 40 from causing damage to the case member 22 during the process of installing the insulating member 40 into the case member 22, thereby reliably improving the safety performance of the battery.

In one embodiment, the surface of the insulating member 40 facing the corner area of the inner surface of the housing member 22 includes a second arc surface 42, which not only prevents the insulating member 40 from damaging the housing member 22, but also facilitates the molding of the insulating member 40. to improve battery manufacturing efficiency.

In one embodiment, the corner area of the inner surface of the housing member 22 includes a first arc surface, and the arc of the first arc surface is smaller than the arc of the second arc surface, thereby ensuring that the corner area of the insulating member 40 is in contact with the shell. A reliable gap can be provided between the corner areas of the components 22 to prevent the insulating component 40 from damaging the housing component 22 .

In one embodiment, the shell member 22 is stretched and formed, which can effectively improve the molding efficiency of the shell member 22, so that the shell member 22 stretches out the side wall portion 221 and the bottom wall portion 222, and can also ensure that the side walls The portion 221 and the bottom wall portion 222 can have reliable structural strength.

The shell member 22 is integrally stretched and formed. During the stretching process of the shell member 22, arc-shaped corners will be formed. It is difficult to match the insulating member 40 when placed in the corner area. The insulating member 40 faces the corner area of the inner surface of the housing member 22. At least part of the insulating member 40 is spaced apart from the housing member 22 to avoid interference during the assembly process of the insulating member 40. If the corner area of the insulating member 40 presses against the housing member 22, there may be safety risks such as damage to the corner area.

In one embodiment, the ratio of the area enclosed by the circumferential outer surface of the insulating member 40 to the area of the inner surface of the bottom wall portion 222 is 80%-99.98%, while ensuring that the insulating member 40 faces the corner area of the inner surface of the housing member 22 On the basis that at least part of the insulating member 40 is spaced apart from the case member 22 , the insulating member 40 can also achieve effective insulation protection for the side wall portion 221 , thereby improving the insulation performance of the battery core 10 and the side wall portion 221 .

The ratio of the area enclosed by the circumferential outer surface of the insulating member 40 to the area of the inner surface of the bottom wall portion 222 may be 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88 %, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 99.98% etc.

In one embodiment, the insulating member 40 is provided with an escape through hole 41 , and the total area of the escape through hole 41 occupies 30% to 70% of the area of the insulator 40 , so that the escape through hole 41 can effectively avoid battery-related hazards. structure, for example, the avoidance through hole 41 can avoid the pole structure 30, thereby ensuring the electrical connection between the pole structure 30 and the battery core 10, and the avoidance through hole 41 can also realize the dissipation of heat, thereby further Effectively improve the heat dissipation capacity of the battery.

One or more avoidance through holes 41 may be provided on the insulating member 40. For example, there may be multiple avoidance through holes 41, and there may be two pole structures 30. The two avoidance through holes 41 may respectively avoid two pole structures. 30. The avoidance through hole 41 can also be used as a heat dissipation through hole, or the battery can also include an explosion-proof valve, and the avoidance through hole 41 can also be used to avoid the explosion-proof valve. Alternatively, the battery can also include a liquid injection hole, and the avoidance through hole 41 can also be used. Used to avoid injection holes.

The total area of the avoidance through holes 41 can occupy 30%, 32%, 35%, 40%, 45%, 50%, 52%, 55%, 58%, 60%, 62%, 64%, 65%, 68%, 69% or 70% etc.

In one embodiment, the thickness of the insulating member 40 is 0.25mm-0.5mm. On the basis of ensuring the structural strength of the insulating member 40, the insulation protection capability of the insulating member 40 is ensured, and the thickness of the insulating member 40 can be avoided from being too large. It affects the heat dissipation of the battery and can also effectively control the energy density of the battery.

The thickness of the insulating member 40 can be 0.25mm, 0.26mm, 0.28mm, 0.3mm, 0.32mm, 0.35mm, 0.36mm, 0.38mm, 0.4mm, 0.42mm, 0.45mm, 0.46mm, 0.48mm or 0.5mm, etc. .

It should be noted that a battery includes a cell and an electrolyte, which is the smallest unit capable of performing electrochemical reactions such as charging/discharging. An electric core refers to a unit formed by winding or laminating a stack portion, which includes a first pole piece, a separator, and a second pole piece. When the first pole piece is the positive pole piece, the second pole piece is the negative pole piece. Wherein, the polarities of the first pole piece and the second pole piece can be interchanged. The first pole piece and the second pole piece are coated with active material.

In one embodiment, the battery may be a four-prism battery. A four-prism battery mainly refers to a prismatic battery, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not strictly limited. It must be a right angle, and it can be an arc transition.

The battery can be a stacked battery, which is not only convenient for grouping, but also can be processed to obtain a longer battery. Specifically, the battery core is a laminated battery core. The battery core has first pole pieces stacked on each other, a second pole piece electrically opposite to the first pole piece, and is arranged between the first pole piece and the second pole piece. diaphragm pieces, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery core.

Alternatively, the battery may be a wound battery, that is, the first pole piece, the second pole piece electrically opposite to the first pole piece, and the separator sheet disposed between the first pole piece and the second pole piece are rolled, Get the wound battery core.

In one embodiment, the battery may be a cylindrical battery, or the battery may be a hexagonal prismatic battery. The battery may be a rolled battery, that is, the first pole piece, the second pole piece electrically opposite to the first pole piece, and the separator piece disposed between the first pole piece and the second pole piece are rolled to obtain a rolled battery. Wound battery core.

One embodiment of the present invention also provides a battery pack, including the above-mentioned battery.

The battery of the battery pack according to one embodiment of the present invention includes a battery core 10, a casing 20, a pole structure 30 and an insulator 40. The battery core 10 and the insulator 40 are arranged in the casing 20, and the pole structure 30 is arranged in the casing. On the body 20 , the pole structure 30 is electrically connected to the battery core 10 , and the insulating member 40 forms insulation protection for the battery core 10 and the casing 20 . The housing 20 includes a cover plate 21 and a housing part 22, and the side wall part 221 and the bottom wall part 222 of the housing part 22 are one-piece structures. The pole structure 30 is disposed on the bottom wall part 222, by making the insulating part 40 is spaced apart from the housing member 22 toward at least part of the corner area of the inner surface of the housing member 22, thereby avoiding the possibility of interference during the installation of the insulating member 40 to the housing member 22, and also preventing the insulating member 40 from pressing against the housing. The corner area of the body member 22 may cause safety risks of damage to the housing member 22, thereby effectively improving the safe performance of the battery pack.

In one embodiment, the battery pack is a battery module or battery pack.

The battery module includes a plurality of batteries, and the battery module may also include an end plate and a side plate, and the end plate and the side plate are used to fix the plurality of batteries.

It should be noted that multiple batteries can be formed into a battery module and placed in the battery box, and the multiple batteries can be fixed through end plates and side plates. Multiple batteries can be directly installed in the battery box, that is, there is no need to group multiple batteries. At this time, the end plates and side plates can be removed.

Other embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present disclosure and include common knowledge or customary techniques in the technical field that are not disclosed in the present disclosure. means. It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise structures described above and illustrated in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (11)

1. A battery, characterized in that it includes: battery(10); Housing (20), the battery core (10) is arranged in the housing (20), the housing (20) includes a cover plate (21) and a housing part (22), the housing part (22) includes a side wall part (221) and a bottom wall part (222). The side wall part (221) and the bottom wall part (222) are an integrally formed structure. The cover plate (21) and the The side wall parts (221) are connected, and the cover plate (21) and the bottom wall part (222) are arranged oppositely; A pole structure (30), the pole structure (30) is arranged on the bottom wall part (222) and is electrically connected to the battery core (10); Insulating part (40), the insulating part (40) is arranged between the bottom wall part (222) and the battery core (10), the insulating part (40) faces the housing part (22) At least part of the corner area of the inner surface is spaced apart from the housing part (22). 2. The battery according to claim 1, characterized in that the corner area of the inner surface of the housing member (22) includes a first curved surface. 3. The battery according to claim 2, characterized in that the corner area of the inner surface of the housing member (22) includes a first arc surface (223). 4. The battery according to claim 1, characterized in that the surface of the insulating member (40) facing the corner area of the inner surface of the housing member (22) includes a second curved surface. 5. The battery according to claim 4, characterized in that the surface of the insulating member (40) facing the corner area of the inner surface of the housing member (22) includes a second arc surface (42). 6. The battery according to claim 5, characterized in that the corner area of the inner surface of the housing member (22) includes a first arc surface, and the arc of the first arc surface is smaller than the second arc surface. The curvature of the arc. 7. The battery according to any one of claims 1 to 6, characterized in that the housing part (22) is stretch-formed. 8. The battery according to any one of claims 1 to 6, characterized in that the area enclosed by the circumferential outer surface of the insulating member (40) and the area of the inner surface of the bottom wall portion (222) The ratio is 80%-99.98%. 9. The battery according to any one of claims 1 to 6, characterized in that the insulating member (40) is provided with an escape through hole (41), and the total area of the escape through hole (41) occupies 30%-70% of the area of the insulating member (40). 10. The battery according to any one of claims 1 to 6, characterized in that the thickness of the insulating member (40) is 0.25mm-0.5mm. 11. The battery according to any one of claims 1 to 6, characterized in that the battery is a square prismatic battery.