CN216850098U - Battery and battery pack - Google Patents

Abstract

The utility model relates to a battery technology field provides a battery and group battery. The battery includes: the two opposite first outer surfaces and four second outer surfaces surrounding the first outer surfaces, the area of the first outer surfaces is larger than that of the second outer surfaces, and the distance between the two first outer surfaces is a millimeter; the positive electrode post and the negative electrode post are respectively arranged on the two second outer surfaces which are opposite to each other, the area of the end face of the positive electrode post, which protrudes out of the second outer surfaces, is b square millimeters, and the area of the end face of the negative electrode post, which protrudes out of the second outer surfaces, is c square millimeters; wherein b/a is more than or equal to 15 and less than or equal to 30, and c/a is more than or equal to 15 and less than or equal to 30, so that the positive electrode pole and the negative electrode pole can ensure basically consistent overcurrent capacity, the overall temperature balance of the battery can be quickly realized, and the local temperature rise of the battery is avoided being too fast, thereby improving the service performance of the battery.

Description

Battery and battery pack

Technical Field

The utility model relates to a battery technology field especially relates to a battery and group battery.

Background

Among the correlation technique, the battery is in charge and discharge process, and utmost point post can produce the heat in a large number, because utmost point post structure and battery major structure's restriction, appears the local overheat of battery easily, can't realize the problem of thermal equilibrium fast.

SUMMERY OF THE UTILITY MODEL

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

According to a first aspect of the present invention, there is provided a battery, comprising:

the two opposite first outer surfaces and four second outer surfaces surrounding the first outer surfaces, the area of the first outer surfaces is larger than that of the second outer surfaces, and the distance between the two first outer surfaces is a millimeter;

the positive pole and the negative pole are respectively arranged on the two opposite second outer surfaces, the area of the end face of the positive pole protruding out of the second outer surfaces is b square millimeters, and the area of the end face of the negative pole protruding out of the second outer surfaces is c square millimeters;

wherein b/a is more than or equal to 15 and less than or equal to 30, and c/a is more than or equal to 15 and less than or equal to 30.

The utility model discloses the battery includes two first surfaces, four second surfaces, anodal utmost point post and negative terminal, the area of first surface is greater than the area of second surface, and anodal utmost point post and negative terminal set up respectively in two relative second surfaces, can make two electrodes of battery draw forth the end and draw forth by the relative both sides of battery, thereby can make the heat distribution that anodal utmost point post and negative terminal produced in the relative both sides of battery, with this thermal dispersion has been realized, avoid the battery local overheat to appear. And through the proportional relation between the terminal surface area of control anodal utmost point post and the distance between two first surfaces to and the proportional relation between the terminal surface area of negative pole post and the distance between two first surfaces, can be so that anodal utmost point post and negative pole post guarantee the ability of overflowing of unanimity basically, and be favorable to realizing the overall temperature balance of battery fast, avoid the local temperature rise of battery too fast, with this performance that improves the battery.

According to a second aspect of the present invention, there is provided a battery pack comprising the above battery.

The utility model discloses group battery includes the battery, the battery includes two first surfaces, four second surfaces, anodal utmost point post and negative terminal, the area of first surface is greater than the area of second surface, and anodal utmost point post and negative terminal set up respectively in two relative second surfaces, can make two electrodes of battery draw forth the end and draw forth by the relative both sides of battery, thereby can make the heat distribution that anodal utmost point post and negative terminal produced in the relative both sides of battery, thermal dispersion has been realized with this, avoid the battery local overheat to appear. And through the proportional relation between the terminal surface area of control anodal utmost point post and the distance between two first surfaces to and the proportional relation between the terminal surface area of negative pole post and the distance between two first surfaces, can be so that anodal utmost point post and negative pole post guarantee the ability of overflowing of unanimity basically, and be favorable to realizing the overall temperature equilibrium of battery fast, avoid the local temperature rise of battery too fast, with this performance that improves the group battery.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:

FIG. 1 is a schematic diagram illustrating a first perspective of a battery according to an exemplary embodiment;

FIG. 2 is a schematic diagram illustrating a second perspective of a battery according to an exemplary embodiment;

FIG. 3 is a schematic diagram illustrating a third perspective of a battery according to an exemplary embodiment;

FIG. 4 is a schematic diagram illustrating a fourth perspective of a battery according to an exemplary embodiment;

FIG. 5 is an exploded schematic view of a battery according to an exemplary embodiment;

FIG. 6 is a schematic diagram of a housing member for a battery according to an exemplary embodiment;

fig. 7 is a schematic diagram illustrating a cell structure of a battery according to an exemplary embodiment;

fig. 8 is a partial structural schematic view illustrating a battery pack according to an exemplary embodiment.

The reference numerals are explained below:

1. a battery case; 2. a battery module; 10. a battery case; 11. a first outer surface; 12. a second outer surface; 14. a housing member; 141. a first opening; 142. a second opening; 15. a first cover plate assembly; 16. a second cover plate assembly; 20. an electric core; 21. a cell main body; 22. a positive electrode tab; 23. a negative electrode tab; 30. a positive pole column; 40. a negative electrode post; 50. an explosion-proof valve.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the 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, and it is, therefore, to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means 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 possibly multiple such objects.

The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as the case may be.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.

An embodiment of the present invention provides a battery, please refer to fig. 1 to fig. 7, the battery includes: two opposite first outer surfaces 11 and four second outer surfaces 12 surrounding the first outer surfaces 11, the area of the first outer surfaces 11 is larger than that of the second outer surfaces 12, and the distance between the two first outer surfaces 11 is a mm; the positive electrode post 30 and the negative electrode post 40 are respectively arranged on the two opposite second outer surfaces 12, the area of the end face of the positive electrode post 30 protruding out of the second outer surfaces 12 is b square millimeters, and the area of the end face of the negative electrode post 40 protruding out of the second outer surfaces 12 is c square millimeters; wherein b/a is more than or equal to 15 and less than or equal to 30, and c/a is more than or equal to 15 and less than or equal to 30.

The utility model discloses a battery of an embodiment includes two first surfaces 11, four second surface 12, anodal utmost point post 30 and negative terminal post 40, the area of first surface 11 is greater than the area of second surface 12, and anodal utmost point post 30 and negative terminal post 40 set up respectively in two relative second surface 12, can make two electrodes of battery draw forth the end and draw forth by the relative both sides of battery, thereby can make the heat distribution that anodal utmost point post 30 and negative terminal post 40 produced in the relative both sides of battery, with this thermal dispersion has been realized, avoid the battery local overheat to appear. And by controlling the proportional relation between the end surface area of the anode pole 30 and the distance between the two first outer surfaces 11 and the proportional relation between the end surface area of the cathode pole 40 and the distance between the two first outer surfaces 11, the anode pole 30 and the cathode pole 40 can ensure basically consistent overcurrent capacity, the overall temperature balance of the battery can be rapidly realized, the local temperature rise of the battery is avoided being too fast, and the use performance of the battery is improved.

It should be noted that, during the charging and discharging processes of the batteries, the positive electrode terminal 30 and the negative electrode terminal 40 are respectively used as two electrode leading-out terminals, and after the batteries are grouped, the batteries can be connected in series or in parallel through a bus bar, that is, the positive electrode terminal 30 and the negative electrode terminal 40 can be connected with the bus bar. The current transmission of the battery depends on the anode pole 30 and the cathode pole 40, in the current transmission process, the anode pole 30 and the cathode pole 40 can generate a large amount of heat, the anode pole 30 and the cathode pole 40 in the embodiment are respectively arranged on the two opposite second outer surfaces 12, so that two electrode leading-out ends of the battery can be led out from two opposite sides of the battery, the heat generated by the poles can be dispersed on the two opposite sides of the battery and can be diffused to the whole battery, thereby achieving the balance of the heat, and because the anode pole 30 and the cathode pole 40 are connected with a busbar, the heat of the anode pole 30 and the cathode pole 40 can be transferred to the busbar, thereby avoiding a large amount of heat from being concentrated on the battery, thereby realizing the diffusion of the heat, avoiding the thermal runaway of the battery, and avoiding the failure of components near the poles due to the concentration of the heat, for example, thermal failure of the seal ring may be avoided.

As shown in fig. 1 and 2, the battery includes two opposite first outer surfaces 11 and four second outer surfaces 12 surrounding the first outer surfaces 11, the area of the first outer surfaces 11 is larger than that of the second outer surfaces 12, and the distance between the two first outer surfaces 11 is a mm, i.e., the thickness of the battery may be a mm. When the thickness of the battery is small, not only is the processing difficult, but also the capacity of a single battery is low, and when the same charge-discharge strategy is adopted, the charge-discharge time is relatively short, and the total amount of heat generated by the anode pole 30 and the cathode pole 40 is small. When the thickness of the battery is thick, the capacity of the battery may be relatively high, and when the same charge and discharge strategy is adopted, the charge and discharge time is relatively long, and the total amount of heat generated by the positive electrode terminal 30 and the negative electrode terminal 40 is large, but the thick battery may cause the uniformity of the internal material system and the uniformity of the temperature to be poor, and the battery performance cannot be effectively exerted.

After the battery generates heat, the battery can realize heat balance by depending on the battery shell and the internal pole piece, the smaller the thickness of the battery is, the easier the quick heat balance is realized, and the larger the thickness of the battery is, the more time is needed for heat balance.

Referring to fig. 3 and 4, the area of the end surface of the positive electrode post 30 protruding out of the second outer surface 12 is b square millimeters, the area of the end surface of the negative electrode post 40 protruding out of the second outer surface 12 is c square millimeters, and the area of the positive electrode post 30 and the area of the negative electrode post 40 can determine the overcurrent capacity of the post. For the batteries with the same thickness, the area of the pole column is smaller, the generated heat is more, the area of the pole column is larger, the generated heat is less, and the contact area between the pole column and the bus bar is also determined, namely the heat dissipation capacity of the pole column through the bus bar. When the pole area is too large, the pole dissipates the heat to the outside through the busbar and is larger, so that the temperature of the battery is unbalanced easily.

For the battery with the sizes of the positive pole post 30 and the negative pole post 40 basically consistent, the thickness of the battery cannot be made too large, because the thickness is too large, the number of layers of the pole pieces is increased, or the pole pieces are made thick, no matter which situation is the case, the heat is finally dissipated through the battery shell by means of mutual transmission between the pole pieces and becomes difficult, most of heat generated in the battery at the moment needs to be transmitted through the pole posts, and the small pole posts cannot realize rapid heat transmission. When the thickness of the battery is too small, the smaller the thickness is, the heat inside the battery can be easily exchanged with the battery shell, and at the moment, the temperature of the battery is easily inconsistent with the temperature of the pole, so that the local temperature of the battery is unbalanced.

In the embodiment, b/a is more than or equal to 15 and less than or equal to 30, and c/a is more than or equal to 15 and less than or equal to 30, so that the heat balance of the battery can be considered on the basis of ensuring that the anode pole 30 and the cathode pole 40 have basically consistent overcurrent capacity, and the local temperature rise of the battery is prevented from being too fast, thereby improving the safety performance of the battery.

Note that the battery includes the battery cell 20 and an electrolyte, and is a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell 20 refers to a unit formed by winding or laminating a stack portion including a first pole piece, a separator, and a second pole piece. When the first pole piece is a positive electrode, the second pole piece is a negative electrode. And the polarities of the first pole piece and the second pole piece can be interchanged.

The battery can be the lamination formula battery, and it is convenient not only to organize, and can process and obtain the longer battery of length. Specifically, the battery cell 20 is a laminated battery cell, and the battery cell 20 has a first pole piece, a second pole piece opposite to the first pole piece in electrical property, and a diaphragm disposed between the first pole piece and the second pole piece, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form the laminated battery cell.

Alternatively, the battery may be a wound battery, that is, a first pole piece, a second pole piece opposite to the first pole piece in electrical property, and a diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery core.

In one embodiment, the battery is a wound battery, b/a is greater than or equal to 15 and less than or equal to 20, c/a is greater than or equal to 15 and less than or equal to 20, and the heat of the wound battery is easy to transfer between the electrode plates of different layers, so that the thickness of the wound battery can be relatively thick, and the heat balance of the battery can be considered on the basis of ensuring that the anode pole 30 and the cathode pole 40 have basically consistent overcurrent capacity, so that the local temperature rise of the battery is avoided from being too fast, and the safety performance of the battery is improved.

In one embodiment, the battery is a laminated battery, b/a is not less than 18 and not more than 30, c/a is not less than 18 and not more than 30, and the heat of the laminated battery is difficult to transfer between different layers of pole pieces, so that the thickness of the laminated battery needs to be relatively thin, and the heat balance of the battery can be considered on the basis of ensuring that the anode pole 30 and the cathode pole 40 have basically consistent overcurrent capacity, thereby avoiding the local temperature rise of the battery too fast and improving the safety performance of the battery.

It should be noted that, when the battery is a winding battery, the positive electrode plate and the negative electrode plate are separately rolled, and the heat transfer between the different electrode plates can be easier than that of a laminated battery, so that the winding battery can be thicker than the laminated battery for the batteries with the positive electrode terminal 30 and the negative electrode terminal 40 having substantially the same size.

In some embodiments, b/a may be 15, 15.2, 15.5, 16, 17, 17.5, 17.9, 18, 18.1, 18.3, 18.5, 19, 19.5, 19.8, 20, 20.1, 20.3, 20.5, 20.8, 21, 21.5, 22, 22.5, 23, 23.5, 24, 24.5, 25, 25.5, 26, 26.5, 27, 28, 29, 29.5, 29.8, 29.9, or 30, and so forth.

In some embodiments, c/a may be 15, 15.2, 15.5, 16, 17, 17.5, 17.9, 18, 18.1, 18.3, 18.5, 19, 19.5, 19.8, 20, 20.1, 20.3, 20.5, 20.8, 21, 21.5, 22, 22.5, 23, 23.5, 24, 24.5, 25, 25.5, 26, 26.5, 27, 28, 29, 29.5, 29.8, 29.9, or 30, and so forth.

In one embodiment, a is more than or equal to 20 and less than or equal to 45, the thickness range of the battery is 20-45 mm, and on the basis of ensuring that the battery has enough capacity, the heat can be transmitted between different layers of pole pieces, so that the heat balance of the battery is quickly realized, the local temperature rise of the battery is prevented from being too fast, and the safety performance of the battery is improved.

In some embodiments, the distance a between the two first outer surfaces 11, i.e. the thickness of the cell, may be 20mm, 20.5mm, 20.8mm, 21mm, 21.5mm, 21.8mm, 22mm, 22.5mm, 23mm, 24mm, 24.5mm, 25mm, 26mm, 26.5mm, 26.8mm, 27mm, 27.5mm, 28mm, 29mm, 29.5mm, 30mm, 31mm, 31.5mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 40.5mm, 41mm, 42mm, 42.5mm, 43mm, 43.5mm, 44mm, 44.2mm, 44.5mm, 44.6mm, 44.8mm, or 45mm, and so forth.

In one embodiment, b is more than or equal to 500 and less than or equal to 700, c is more than or equal to 500 and less than or equal to 700, so that the positive electrode pole 30 and the negative electrode pole 40 can have enough contact area with the bus bar, and on the basis of ensuring reliable overcurrent capacity, the heat dissipation capacity of the positive electrode pole 30 and the negative electrode pole 40 through the bus bar can be ensured, so that the heat on the positive electrode pole 30 and the negative electrode pole 40 can be rapidly diffused, the heat concentration is avoided, and the heat balance of the battery can be rapidly realized.

In some embodiments, the area b of the end surface of the positive electrode post 30 protruding the first outer surface 11 may be 500mm²、510mm²、520mm²、550mm²、570mm²、580mm²、590mm²、600mm²、610mm²、620mm²、630mm²、650mm²、690mm²、695mm²Or 700mm²And so on. The area d of the end surface of the cathode post 40 protruding from the second outer surface 12 may be 500mm²、510mm²、520mm²、550mm²、570mm²、580mm²、590mm²、600mm²、610mm²、620mm²、630mm²、650mm²、690mm²、695mm²Or 700mm²And so on.

In one embodiment, the capacity of the battery ranges from 50Ah to 280Ah, during the charging and discharging process of the battery, the positive electrode post 30 and the negative electrode post 40 generate a large amount of heat, and by controlling the proportional relationship between the end surface area of the positive electrode post 30 and the distance between the two first outer surfaces 11 and the proportional relationship between the end surface area of the negative electrode post 40 and the distance between the two first outer surfaces 11, the positive electrode post 30 and the negative electrode post 40 can ensure substantially consistent overcurrent capacity, and the overall temperature balance of the battery can be realized rapidly, so that the local temperature of the battery is prevented from rising too fast, and the service performance of the battery is improved.

In some embodiments, the capacity of the battery may range from 72Ah to 172 Ah. The capacity of the battery may be 50Ah, 60Ah, 70Ah, 71Ah, 72Ah, 75Ah, 80Ah, 100Ah, 120Ah, 150Ah, 160Ah, 161Ah, 162Ah, 165Ah, 168Ah, 170Ah, 172Ah, 180Ah, 200Ah, 250Ah, 280Ah, or the like.

In one embodiment, the energy density of the battery may range from 120wh/kg to 300 wh/kg.

The battery may be a lithium iron phosphate-based battery, the energy density of the lithium iron phosphate-based battery may be 120wh/kg-190wh/kg, and the energy density of the lithium iron phosphate-based battery may be 120wh/kg, 121wh/kg, 125wh/kg, 140wh/kg, 150wh/kg, 160wh/kg, 170wh/kg, 180wh/kg, 185wh/kg, 188wh/kg, 190wh/kg, or the like.

The battery may be a ternary system battery, the energy density of the ternary system battery may be 200wh/kg-300wh/kg, and the energy density of the ternary system battery may be 200wh/kg, 201wh/kg, 210wh/kg, 220wh/kg, 230wh/kg, 240wh/kg, 248wh/kg, 250wh/kg, 260wh/kg, 270wh/kg, 280wh/kg, 290wh/kg, 295wh/kg, 298wh/kg, 300wh/kg, and the like.

In one embodiment, the area of the end surface of the positive electrode post 30 protruding out of the second outer surface 12 is approximately equal to the area of the end surface of the negative electrode post 40 protruding out of the second outer surface 12, i.e. b ≈ c, which not only can simplify the structure of the positive electrode post 30 and the negative electrode post 40, but also can ensure that the positive electrode post 30 and the negative electrode post 40 have substantially the same contact area with the busbar, and can ensure that the positive electrode post 30 and the negative electrode post 40 have reliable heat dissipation capability, thereby rapidly achieving heat balance of the battery.

It should be noted that the area of the end surface of the positive electrode post 30 protruding out of the second outer surface 12 is approximately equal to the area of the end surface of the negative electrode post 40 protruding out of the second outer surface 12, that is, the area of the end surface of the positive electrode post 30 protruding out of the second outer surface 12 is equal to the area of the end surface of the negative electrode post 40 protruding out of the second outer surface 12 on the basis of neglecting manufacturing errors and installation errors, that is, b is equal to c.

The battery is a rectangular battery. The first outer surface 11 is a large surface of the battery, the second outer surfaces 12 are small surfaces of the battery, and two second outer surfaces 12 of the four second outer surfaces 12 are first small surfaces, and the other two second outer surfaces 12 are second small surfaces, the area of the first small surfaces may be larger than that of the second small surfaces, and the positive electrode post 30 and the negative electrode post 40 may be disposed on the two second small surfaces, respectively.

In one embodiment, as shown in fig. 5 and 7, the battery further includes: a battery case 10; battery 20, battery 20 sets up in battery housing 10, battery 20 includes electric core main part 21, anodal utmost point ear 22 and negative pole utmost point ear 23 extend out by the relative both ends of electric core main part 21 respectively, anodal utmost point post 30 is connected with anodal utmost point ear 22, negative pole post 40 is connected with negative pole utmost point ear 23, thereby make anodal utmost point post 30 and negative pole post 40 form two electrodes of battery and draw forth the end, realize charging and discharging of battery, and can make the heat that anodal utmost point post 30 and negative pole post 40 produced to diffuse fast, with this thermal balance who guarantees the battery.

In one embodiment, the positive electrode tab 22 extends from the cell body 21 toward one end of the second outer surface 12 where the positive electrode terminal 30 is disposed, and the negative electrode tab 23 extends from the cell body 21 toward the other end of the second outer surface 12 where the negative electrode terminal 40 is disposed, so that the connection path between the positive electrode terminal 30 and the positive electrode tab 22, the connection path between the negative electrode terminal 40 and the negative electrode tab 23 can be shortened, and the internal space of the battery case 10 can be utilized to the maximum extent.

In one embodiment, as shown in fig. 5 and 6, the battery case 10 includes: a shell member 14, the shell member 14 including opposing first and second openings 141 and 142; the first cover plate assembly 15, the first cover plate assembly 15 is connected to the first opening 141, and the positive pole 30 is arranged on the first cover plate assembly 15; the second cover plate assembly 16, the second cover plate assembly 16 is connected to the second opening 142, the negative electrode post 40 is arranged on the second cover plate assembly 16, so that the positive electrode post 30 and the negative electrode post 40 form two electrode leading-out ends of the battery, the charging and discharging of the battery are realized, and the heat generated by the positive electrode post 30 and the negative electrode post 40 can be diffused through the first cover plate assembly 15 and the second cover plate assembly 16, so that the heat is quickly balanced.

Two of the four second outer surfaces 12 may be outer surfaces of the first cover assembly 15 and the second cover assembly 16, respectively, and the other two second outer surfaces 12 and the two first outer surfaces 11 may be four outer surfaces of the shell member 14, or the outer surface of the shell member 14 may be provided with a protective film, in which case, the other two second outer surfaces 12 and the two first outer surfaces 11 may be four outer surfaces of the protective film, which is not limited herein.

The positive electrode terminal 30 and the first lid member 15 are insulated from each other, and the negative electrode terminal 40 and the second lid member 16 are insulated from each other. The first cover plate assembly 15 may include a metal cover plate, and the metal cover plate and the positive electrode terminal 30 may be insulated by a coating, for example, aluminum oxide (Al) may be coated on the metal cover plate₂O₃) Zirconium oxide (ZrO)₂) Etc. the ceramic material forms a coating. The second cover assembly 16 may include a metal cover that may be insulated from the cathode post 40 with a coating, such as aluminum oxide (Al) on the metal cover₂O₃) Zirconium oxide (ZrO)₂) Etc. the ceramic material forms a coating.

Alternatively, the first cover plate assembly 15 may include a metal cover plate and an insulating member, the metal cover plate is insulated from the positive electrode post 30 by the insulating member, and the insulating member may include an upper plastic part, a sealing ring, and a lower plastic part. The second cover plate assembly 16 may include a metal cover plate and an insulating member, the metal cover plate and the negative electrode post 40 are insulated by the insulating member, and the insulating member may include an upper plastic part, a sealing ring and a lower plastic part. The metal cover plate may be made of stainless steel or aluminum, and the housing member 14 may be made of stainless steel or aluminum.

It should be noted that the positive electrode terminal 30 and the positive electrode tab 22 may be directly connected, for example, the positive electrode terminal 30 and the positive electrode tab 22 may be directly welded, and the negative electrode terminal 40 and the negative electrode tab 23 may be directly connected, for example, the negative electrode terminal 40 and the negative electrode tab 23 may be directly welded.

Or, the positive pole 30 and the positive pole tab 22 may be connected by an adapter plate, the positive pole 30 and the adapter plate may be welded, and the positive pole tab 22 and the adapter plate may be welded. The negative pole post 40 and the negative pole tab 23 can be connected through an adapter plate, the negative pole post 40 and the adapter plate can be welded, and the negative pole tab 23 and the adapter plate can be welded.

Or, the positive pole 30 and the positive pole tab 22 may be connected through an adapter plate, the positive pole 30 and the adapter plate may be riveted, and the positive pole tab 22 and the adapter plate may be welded. The negative electrode post 40 and the negative electrode tab 23 may be riveted, and the negative electrode tab 23 and the adaptor plate may be welded.

In one embodiment, as shown in fig. 6, the battery further includes an explosion-proof valve 50, and the explosion-proof valve 50 is disposed on the housing member 14 such that when the internal pressure of the battery reaches a certain level, the explosion-proof valve 50 is ruptured to release the internal pressure of the battery, thereby avoiding causing a safety problem.

The explosion-proof valve 50 may be an explosion-proof membrane, an explosion-proof sheet, etc., and the housing member 14 may have a through hole, and the explosion-proof valve 50 is connected to the housing member 14 to shield the through hole. Alternatively, the explosion-proof valve 50 may be a part of the housing member 14, that is, the explosion-proof valve 50 and the housing member 14 are formed as an integral structure, and the explosion-proof valve 50 may be formed by thinning a part of the structure of the housing member 14 so that the explosion-proof valve 50 is broken when the internal pressure of the battery reaches a certain level, for example, a notch or the like is formed on the housing member 14 as the explosion-proof valve 50.

In one embodiment, the explosion-proof valve 50 is disposed on the small surface of the housing member 14, so that when a plurality of batteries are grouped, the large surface of the housing member 14 can be used as a stacking surface, i.e., the large surfaces of the housing members 14 of two adjacent batteries are oppositely disposed, and the explosion-proof valve 50 is disposed on the small surface of the housing member 14, so that the adjacent batteries can be avoided, and the explosion-proof valve 50 can be reliably exploded, thereby ensuring the safety performance of the batteries.

The battery includes two first outer surfaces 11 and four second outer surfaces 12, two opposite ones of the four second outer surfaces 12 may be outer surfaces of a first cap member 15 and a second cap member 16, respectively, and the other two second outer surfaces 12 and two first outer surfaces 11 may be four outer surfaces of a case member 14, and the first outer surface 11 has a larger area than the second outer surfaces 12, in which case the first outer surface 11 is a large surface of the case member 14 and the second outer surface 12 is a small surface of the case member 14. The large and small surfaces here are to be understood as: the area of the large surface is larger than that of the small surface.

It should be noted that the battery can be disposed in the battery box for use, and the explosion-proof valve 50 is disposed on the small surface of the housing member 14, in which case the explosion-proof valve 50 can be toward the top of the battery box, or the explosion-proof valve 50 can be toward the bottom of the battery box.

The explosion-proof valve 50 may be directed toward the bottom of the battery case, and the cell case may be formed with a battery receiving space and an exhaust space, and after the explosion-proof valve 50 of the battery is exploded, the battery receiving space and the exhaust space may be communicated with each other, so that gas discharged from the battery enters the exhaust space and is discharged out of the battery case.

An embodiment of the utility model also provides a battery pack, including foretell battery.

The utility model discloses a group battery of embodiment includes the battery, the battery includes two first surfaces 11, four second surface 12, anodal utmost point post 30 and negative terminal post 40, the area of first surface 11 is greater than the area of second surface 12, and anodal utmost point post 30 and negative terminal post 40 set up respectively in two relative second surface 12, can make two electrodes of battery draw forth the end and draw forth by the relative both sides of battery, thereby can make the heat distribution that anodal utmost point post 30 and negative terminal post 40 produced in the relative both sides of battery, thermal dispersion has been realized with this, avoid the battery to appear local overheat. And by controlling the proportional relation between the end surface area of the anode pole 30 and the distance between the two first outer surfaces 11 and the proportional relation between the end surface area of the cathode pole 40 and the distance between the two first outer surfaces 11, the anode pole 30 and the cathode pole 40 can ensure basically consistent overcurrent capacity, the overall temperature balance of the battery can be rapidly realized, the local temperature rise of the battery is avoided being too fast, and the use performance of the battery pack is improved.

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

The battery module includes a plurality of batteries, and the battery module can also include end plate and curb plate, and end plate and curb plate are used for fixing a plurality of batteries.

As shown in fig. 8, a plurality of batteries may be provided in the battery case 1 after forming the battery module 2, and the plurality of batteries may be fixed by end plates and side plates. A plurality of batteries can directly set up in the battery box, need not to pack a plurality of batteries promptly, and at this moment, can get rid of end plate and curb plate.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. 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 will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that 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 (14)

1. A battery, comprising:

two opposite first outer surfaces (11) and four second outer surfaces (12) surrounding the first outer surfaces (11), the area of the first outer surfaces (11) being larger than the area of the second outer surfaces (12), the distance between the two first outer surfaces (11) being a mm;

the positive electrode pole (30) and the negative electrode pole (40) are respectively arranged on the two opposite second outer surfaces (12), the area of the end face, protruding out of the second outer surfaces (12), of the positive electrode pole (30) is b square millimeters, and the area of the end face, protruding out of the second outer surfaces (12), of the negative electrode pole (40) is c square millimeters;

wherein b/a is more than or equal to 15 and less than or equal to 30, and c/a is more than or equal to 15 and less than or equal to 30.

2. The battery according to claim 1, wherein 15. ltoreq. b/a. ltoreq.20, 15. ltoreq. c/a. ltoreq.20.

3. The battery of claim 2, wherein the battery is a wound battery.

4. The battery according to claim 1, wherein 18. ltoreq. b/a. ltoreq.30, 18. ltoreq. c/a. ltoreq.30.

5. The battery of claim 4, wherein the battery is a laminated battery.

6. The battery according to any one of claims 1 to 5, wherein 20. ltoreq. a.ltoreq.45.

7. The battery according to any one of claims 1 to 5, wherein 500. ltoreq. b.ltoreq.700 and 500. ltoreq. c.ltoreq.700.

8. The battery according to any one of claims 1 to 5, wherein the battery has a capacity in the range of 50Ah to 280 Ah.

9. The battery according to any one of claims 1 to 5, characterized in that the area of the end face of the positive electrode post (30) protruding out of the second outer surface (12) is approximately equal to the area of the end face of the negative electrode post (40) protruding out of the second outer surface (12).

10. The battery of claim 1, further comprising:

a battery case (10);

the battery comprises a battery cell (20), wherein the battery cell (20) is arranged in the battery shell (10), the battery cell (20) comprises a battery cell main body (21), a positive electrode tab (22) and a negative electrode tab (23), the positive electrode tab (22) and the negative electrode tab (23) respectively extend out from two opposite ends of the battery cell main body (21), the positive electrode pole (30) is connected with the positive electrode tab (22), and the negative electrode pole (40) is connected with the negative electrode tab (23);

wherein, anodal utmost point ear (22) by electric core main part (21) orientation is provided with anodal utmost point post (30) the one end of second surface (12) extends out, negative pole utmost point ear (23) by electric core main part (21) orientation is provided with negative pole post (40) the other end of second surface (12) extends out.

11. The battery according to claim 10, wherein the battery case (10) comprises:

a housing piece (14), the housing piece (14) comprising opposing first and second openings (141, 142);

a first cover plate assembly (15), the first cover plate assembly (15) being connected to the first opening (141), the positive pole post (30) being disposed on the first cover plate assembly (15);

a second lid assembly (16), the second lid assembly (16) being connected to the second opening (142), the negative terminal post (40) being disposed on the second lid assembly (16).

12. The battery of claim 11, further comprising an explosion-proof valve (50), the explosion-proof valve (50) being disposed on the housing member (14);

wherein the explosion-proof valve (50) is arranged on a small surface of the housing part (14).

13. The battery of claim 1, wherein the battery is a prismatic battery.

14. A battery pack characterized by comprising the battery according to any one of claims 1 to 13.

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