CN113113692A

CN113113692A - Battery, battery module, battery pack and electric vehicle

Info

Publication number: CN113113692A
Application number: CN202010027935.4A
Authority: CN
Inventors: 张中林; 周燕飞; 张越
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-01-10
Filing date: 2020-01-10
Publication date: 2021-07-13

Abstract

The invention discloses a battery, a battery module, a battery pack and an electric vehicle, wherein the battery comprises: a housing; the electric core assembly comprises a plurality of pole core groups, the pole core groups of each layer of electric core assembly are connected in series, and when the electric core assembly is multilayer, the plurality of layers of electric core assemblies are electrically connected; the heat-conducting plate, the heat-conducting plate is established in the casing, and casing and electric core subassembly all are connected with the heat-conducting plate heat conduction. According to the battery provided by the invention, the heat-conducting plate is arranged in the shell of the battery, and is in heat conduction connection with the electric core assembly and the shell, when the battery works, heat generated by the electric core assembly can be transferred to the shell through the heat-conducting plate, and then the heat is transferred outwards through the shell, so that the temperature in the battery can be reduced, the working safety of the battery is improved, and the service life of the electric core is further prolonged.

Description

Battery, battery module, battery pack and electric vehicle

Technical Field

The invention relates to the technical field of batteries, in particular to a battery, a battery module, a battery pack and an electric vehicle.

Background

In the related art, the battery includes a plurality of electrode core sets (e.g., two layers), and when the battery is in operation, the electrode core sets generate a certain amount of heat, which is inefficient in heat exchange with the battery case, and thus, the internal temperature of the battery is easily too high, which affects the safety and the service life of the battery.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a battery which has the advantages of high safety and long service life.

A battery according to an embodiment of the present invention includes: a housing; the at least one layer of electric core assembly comprises a plurality of polar core groups, the plurality of polar core groups of each layer of electric core assembly are connected in series, and when the electric core assembly is multi-layer, the multi-layer electric core assemblies are electrically connected; the heat-conducting plate, the heat-conducting plate is established in the casing, the casing with the electric core subassembly all with the heat-conducting plate heat conduction is connected.

According to the battery provided by the embodiment of the invention, the heat-conducting plate is arranged in the shell of the battery, and is in heat conduction connection with the electric core assembly and the shell, when the battery works, heat generated by the electric core assembly can be transferred to the shell through the heat-conducting plate, and then the heat is transferred outwards through the shell, so that the temperature in the battery can be reduced, the working safety of the battery is improved, and the service life of the electric core is prolonged. In addition, a plurality of pole core groups are connected in series, and the high-voltage output of the battery can be realized, so that the high-voltage requirement of a user on the battery can be met.

According to some embodiments of the present invention, the plurality of pole core groups of the pole core assembly are arranged along a first direction, the pole core group includes a first electrode lead-out member and a second electrode lead-out member for leading out an electric current, and the first electrode lead-out member and the second electrode lead-out member are respectively disposed at both sides of the pole core group along the first direction.

According to some embodiments of the present invention, the housing includes a body and two cover plates, the two cover plates are disposed at two opposite ends of the body to enclose an inner space of the body, and one of the two cover plates is provided with an electrode terminal for drawing out current.

In some embodiments of the present invention, the heat conducting plate has a first end and a second end in a second direction, the second direction is perpendicular to the first direction, at least one of the first end and the second end is provided with a flange, and the flange is attached to the inner wall of the body.

In some embodiments of the present invention, the first end and the second end of the heat conducting plate are both provided with the flanges, and the two flanges are located on the same side or two sides of the heat conducting plate.

In some embodiments of the present invention, the body includes a first connecting portion and a second connecting portion welded to the first connecting portion, and the flange is attached to the body to shield a welding portion between the first connecting portion and the second connecting portion.

In some embodiments of the invention, the body is a unitary piece.

In some embodiments of the present invention, the electric core assembly is provided with a plurality of layers, and the heat conducting plate is arranged between two adjacent electric core assemblies.

In some embodiments of the present invention, the electric core components are in an even number of layers, and two adjacent electric core components are connected in series.

According to some embodiments of the present invention, the heat conductive plate is thermally conductively connected to a thickness-directional surface of the pole core group.

According to some embodiments of the invention, the electrode core assembly further comprises a plurality of insulating films, and the insulating films respectively wrap the plurality of electrode core assemblies in a one-to-one correspondence manner.

The invention further provides a battery module which comprises the battery.

The battery module comprises the battery.

According to the battery module, the heat-conducting plate is arranged in the shell of the battery, and is in heat conduction connection with the electric core assembly and the shell, when the battery works, heat generated by the electric core assembly can be transferred to the shell through the heat-conducting plate, and then the heat is transferred outwards through the shell, so that the temperature inside the battery can be reduced, the working safety of the battery is improved, and the service life of the electric core is prolonged. In addition, a plurality of pole core groups are connected in series, and the high-voltage output of the battery can be realized, so that the high-voltage requirement of a user on the battery can be met.

The invention also provides a battery pack which comprises the battery module or the battery.

The battery pack according to the embodiment of the invention comprises the battery module or the battery.

According to the battery pack provided by the embodiment of the invention, the heat-conducting plate is arranged in the shell of the battery, and is in heat conduction connection with the electric core assembly and the shell, when the battery works, heat generated by the electric core assembly can be transferred to the shell through the heat-conducting plate, and then the heat is transferred outwards through the shell, so that the temperature in the battery can be reduced, the working safety of the battery is improved, and the service life of the electric core is prolonged. In addition, a plurality of pole core groups are connected in series, and the high-voltage output of the battery can be realized, so that the high-voltage requirement of a user on the battery can be met.

The invention further provides an electric vehicle which comprises the battery pack.

The electric vehicle comprises the battery pack.

According to the electric vehicle provided by the embodiment of the invention, the heat-conducting plate is arranged in the shell of the battery, and is in heat conduction connection with the battery core assembly and the shell, when the battery works, heat generated by the battery core assembly can be transferred to the shell through the heat-conducting plate, and then the heat is transferred outwards through the shell, so that the temperature in the battery can be reduced, the working safety of the battery is improved, and the service life of the battery core is prolonged. In addition, a plurality of pole core groups are connected in series, and the high-voltage output of the battery can be realized, so that the high-voltage requirement of a user on the battery can be met.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a battery according to an embodiment of the present invention;

fig. 2 is an exploded view of a battery according to one embodiment of the present invention;

fig. 3 is a cross-sectional view of a battery according to one embodiment of the present invention;

fig. 4 is a cross-sectional view of a battery according to another embodiment of the invention, with the pole piece assembly not shown;

fig. 5 is a cross-sectional view of a battery according to yet another embodiment of the invention, with the pole piece assembly not shown;

fig. 6 is a cross-sectional view of a battery according to yet another embodiment of the invention, with the pole piece assembly not shown;

fig. 7 is an enlarged view at a in fig. 6.

Reference numerals:

the number of the cells 100 is such that,

the shell 1, the body 11, the cover plate 12,

the electrode terminal 13, the positive electrode 131, the negative electrode 132,

the electrode core assembly 2, the electrode core assembly 21, the electrode core 211,

the heat-conducting plate 3, the turned-up edge 31,

a first connecting member 41 and a second connecting member 42.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "thickness", "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, are not to be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A battery 100 according to an embodiment of the present invention is described below with reference to the drawings.

As shown in fig. 1 and 2, a battery 100 according to an embodiment of the present invention includes: the shell 1, the electric core component 2 and the heat conducting plate 3.

Specifically, as shown in fig. 1 and 2, the electric core assembly 2 is provided inside the housing 1. The shell 1 has a protective function on the cell assembly 2, and the shell 1 can separate external dust or liquid from the cell assembly 2, so that the safety and reliability of the operation of the cell assembly 2 can be ensured.

As shown in fig. 1 and 2, the electric core assembly 2 is provided with at least one layer, and when the electric core assembly is multi-layer, the multi-layer electric core assembly is electrically connected. It can be understood that one layer of electric core assembly 2, two layers of electric core assembly 2, three layers of electric core assembly 2, four layers of electric core assembly 2 or more layers of electric core assembly 2 can be selected and arranged according to the needs of the user, thereby better meeting the needs of the user on the power storage capacity of the battery 100. For example, the electric core assembly 2 may be two layers. Two-layer electric core subassembly 2 stacks up the setting, not only can promote the regularity that two-layer electric core subassembly 2 was arranged from this, can also reduce the space that two-layer electric core subassembly 2 took, is favorable to realizing battery 100's miniaturization. Specifically, in one example of the present invention, the electric core assembly 2 is multi-layered, and the multi-layered electric core assembly 2 is electrically connected therebetween.

As shown in fig. 1 and 2, the electric core assembly 2 includes a plurality of pole-core groups 21, and each pole-core group 21 includes at least one pole core 211. It is understood that each layer of the electrode core assembly 2 may include two electrode core sets 21, three electrode core sets 21, four electrode core sets 21 or more electrode core sets 21, thereby satisfying different voltage requirements of different users. Specifically, each pole core group 21 may include one pole core 211, two pole cores 211, three pole cores 211, or more pole cores 211.

It should be noted that the pole piece 211 in the present invention is a pole piece 211 commonly used in the field of the battery 100, and the pole piece 211 and the pole piece group 21 are components inside the case 1 of the battery 100, and cannot be understood as the battery 100 itself. The pole core 211 may be formed by winding or may be formed by lamination. Generally, the core 211 includes at least a positive electrode sheet, a separator, and a negative electrode sheet, and an electrolyte, and the core 211 generally refers to an assembly that is not completely sealed. Therefore, the battery 100 according to the present invention is a single battery 100, and cannot be simply understood as a battery module or a battery 100 set because it includes a plurality of pole pieces 211. In the present invention, the pole core group 21 may be composed of a single pole core 211, or may include at least two pole cores 211, and the at least two pole cores 211 are connected in parallel to constitute the pole core group 21.

In addition, as shown in fig. 1 and 2, the plurality of pole core groups 21 of each layer of the cell assembly 2 are connected in series, it is possible to achieve a high voltage of the battery 100 and to reduce the manufacturing process and cost. In the related art, two or more batteries are generally connected in series in order to realize a high voltage of the battery. However, the power connection is performed at the joint between two adjacent batteries connected in series by additionally arranging a power connecting piece, so that the number of battery mounting structures is large, the cost is increased, and the overall weight of the power battery pack is increased; meanwhile, the mounting structure occupies more inner space of the bag body of the battery bag, so that the overall capacity of the power battery bag is reduced. In addition, because of need set up a plurality of external power connecting pieces and carry out the power connection, lead to the internal resistance to increase, improved the internal consumption of power battery package in use.

It should be noted that, in the present invention, the serial connection manner of the pole core groups 21 may be that the adjacent pole core groups 21 are connected in series, and the specific implementation manner may be that the current leading-out parts on the adjacent pole core groups 21 are directly connected, or may be that the electric connection is implemented through an additional conductive part, that is, the two adjacent pole core groups 21 may be directly electrically connected, or may be indirectly electrically connected.

Specifically, in one example of the present invention, the electric core assembly 2 is provided with two layers, each layer of the electric core assembly 2 includes six pole-core groups 21, the six pole-core groups 21 are spaced in the length direction (the left and right direction as shown in fig. 1) of the casing 1 and are connected in series, and each pole-core group 21 includes one pole core 211.

As shown in fig. 1 and 2, the heat conducting plate 3 is disposed in the casing 1, and both the casing 1 and the electric core assembly 2 are connected with the heat conducting plate 3 in a heat conducting manner. The heat conduction connection can be direct contact or can be connected through a heat conduction material. For example, in one example of the present invention, the heat conducting plate 3 is thermally connected with the electric core assembly 2 and the housing 1 through a heat conducting glue.

The heat-conducting plate 3 has the effect of heat conduction, and battery 100 is at the during operation, and the heat that electric core subassembly 2 produced can transmit to casing 1 through heat-conducting plate 3 on, then through casing 1 with this partial heat outside transmission, can reduce the inside temperature of battery 100 from this to promote the security of battery 100 work, and then prolong the life of electric core.

In addition, in a low temperature environment, heat generated from a heating element outside the battery 100 may be transferred to the heat conductive plate 3 through the case 1, and then transferred to the core assembly 2 using the heat conductive plate 3. Therefore, the working problem of the cell assembly 2 in a low-temperature environment can be improved, and the power supply capacity of the battery 100 can be improved.

According to the battery 100 provided by the embodiment of the invention, the heat-conducting plate 3 is arranged in the shell 1 of the battery 100, and the heat-conducting plate 3 is in heat-conducting connection with the electric core assembly 2 and the shell 1, when the battery 100 works, heat generated by the electric core assembly 2 can be transferred to the shell 1 through the heat-conducting plate 3, and then the heat is transferred outwards through the shell 1, so that the temperature inside the battery 100 can be reduced, the working safety of the battery 100 is improved, and the service life of the electric core is prolonged. In addition, the plurality of pole core groups 21 are connected in series, and high voltage output of the battery 100 can be realized, so that the high voltage requirement of the user on the battery 100 can be met.

According to some embodiments of the present invention, as shown in fig. 1 and 2, the plurality of electrode core groups 21 of the electrode core assembly 2 are arranged along a first direction (a left-right direction as shown in fig. 1), the electrode core group 21 includes a first electrode drawing part and a second electrode drawing part for drawing current, and the first electrode drawing part and the second electrode drawing part are respectively disposed at both sides of the electrode core group 21 along the first direction. Wherein the first direction is a length direction of the battery 100.

It can be understood that when a plurality of pole core groups 21 are connected in series, relatively independent circuits of each pole core group 21 need to be connected in series, and by providing the first electrode lead-out member and the second electrode lead-out member on each pole core group 21, the series connection between two adjacent pole core groups 21 can be realized by using the first electrode lead-out member and the second electrode lead-out member, and the connection difficulty is relatively low, and the connection efficiency is relatively high.

Specifically, in one example of the present invention, one of the first and second electrode lead-outs is a positive electrode tab of the electrode core group 21, and the other of the first and second electrode lead-outs is a negative electrode tab of the electrode core group 21, and when two adjacent electrode core groups 21 are connected in series, the first electrode lead-out of one of the electrode core groups 21 and the second electrode lead-out of the other electrode core group 21 may be connected in series.

In another example of the present invention, as shown in fig. 2 and 3, the pole core group 21 includes a plurality of pole cores 211, the first electrode drawing part may be a drawing part formed by compounding and welding together positive pole tabs, and the second electrode drawing part may be a drawing part formed by compounding and welding together negative pole tabs; alternatively, the first electrode lead-out member may be a lead-out member formed by compounding and welding together negative electrode tabs, and the second electrode lead-out member may be a lead-out member formed by compounding and welding together positive electrode tabs.

The first and second electrodes of the first and second electrode lead-out members are used for name distinction and are not limited to a number.

According to some embodiments of the present invention, as shown in fig. 1 and 2, the case 1 includes a body 11 and two cover plates 12, the two cover plates 12 are disposed at opposite ends of the body 11 to enclose an inner space of the body 11, and one of the two cover plates 12 is provided with an electrode terminal 13 for drawing an electric current.

It can be understood that both ends of the body 11 have an open opening respectively, and two cover plates 12 are provided at both ends of the body 11 respectively to close the open opening, so as to isolate the internal space of the body 11 from the external space. The structure of the body 11 and the cover plate 12 is simple, so that the complexity of the structure of the shell 1 can be simplified, the manufacturing difficulty of the shell 1 is reduced, the production efficiency of the shell 1 is improved, and the production cost of the shell 1 is reduced.

Specifically, in one example of the present invention, the body 11 and the two cover plates 12 may be three independent components, and the body 11 and the two cover plates 12 may be manufactured separately, so that the difficulty in processing the housing 1 may be reduced, and the production efficiency of the housing 1 may be improved. In another embodiment of the present invention, the body 11 and one of the two cover plates 12 are an integrally formed member. From this, can reduce the assembly process, improve assembly efficiency, can also promote the structural strength of casing 1 simultaneously, guarantee the reliability that casing 1 connects.

In one example of the present invention, as shown in fig. 1 and 2, the electrode terminal 13 includes a positive electrode 131 and a negative electrode 132 (in conjunction with fig. 2). It is understood that the positive electrode 131 and the negative electrode 132 may be connected to an external circuit to achieve charge and discharge of the battery 100. For example, in one example of the present invention, the positive electrode 131 and the negative electrode 132 may be connected to an external power source, so that charging of the battery 100 may be achieved. In another example of the present invention, the positive electrode 131 and the negative electrode 132 may be connected to a power consuming element (e.g., a motor) through a circuit to provide power support for the power consuming element.

In some embodiments of the present invention, the heat conducting plate 3 has a first end and a second end in a second direction, the second direction is perpendicular to the first direction, at least one of the first end and the second end is provided with a flange 31, and the flange 31 is attached to the inner wall of the body 11. Wherein the second direction is a width direction of the battery 100. It can be understood that, by providing the turned-over edge 31, the contact area between the heat conducting plate 3 and the casing 1 can be increased, so that the heat exchange efficiency between the heat conducting plate 3 and the casing 1 can be improved. For example, in one example of the present invention, as shown in fig. 6, only one end in the width direction of the heat conductive plate 3 is provided with a burring 31, the burring 31 is integrated with the heat conductive plate 3, and the burring 31 is formed by bending a portion of the heat conductive plate 3.

In some embodiments of the invention, as shown in fig. 3 and 4, the first and second ends of the plate 3 are provided with flanges 31, the two flanges 31 being located on the same side of the plate 3. From this, can further increase the area of contact of heat-conducting plate 3 and casing 1 to can further promote the heat exchange efficiency of heat-conducting plate 3 and casing 1. The flanging 31 is arranged at the same side of the heat-conducting plate 3, so that the difficulty of connecting the flanging 31 and the shell 1 can be reduced, and the assembly efficiency of the flanging 31 and the shell 1 is favorably improved.

For example, in one example of the present invention, the electric core assembly 2 has two layers, the two layers of electric core assembly 2 are an upper electric core assembly (the electric core assembly 2 positioned at the upper layer as shown in fig. 3) and a lower electric core assembly (the electric core assembly 2 positioned at the lower layer as shown in fig. 3), the heat-conducting plate 3 is positioned between the upper electric core assembly and the lower electric core assembly, and both flanges 31 of the heat-conducting plate 3 are positioned at one side of the heat-conducting plate 3 adjacent to the upper electric core assembly. Of course, the invention is not limited thereto and, as shown in fig. 4, both flanges 31 of the plate 3 are located on the side of the plate 3 adjacent to the lower core assembly. Specifically, in one example of the invention, the two flanges 31 are integral with the plate 3, the two flanges 31 being respectively formed by bending portions of the plate 3.

In some embodiments of the invention, as shown in fig. 5, the first and second ends of the plate 3 are each provided with a flange 31, the two flanges 31 being located on either side (upper and lower sides as shown in fig. 5) of the plate 3. From this, can further increase the area of contact of heat-conducting plate 3 and casing 1 to can further promote the heat exchange efficiency of heat-conducting plate 3 and casing 1. The flanges 31 are provided on both sides of the heat-conducting plate 3, whereby a symmetrical balance of the two flanges 31 can be achieved.

For example, in one example of the present invention, the electric core assembly 2 has two layers, the two layers of electric core assembly 2 are an upper electric core assembly and a lower electric core assembly, respectively, the heat conducting plate 3 is located between the upper electric core assembly and the lower electric core assembly, one of the two flanges 31 of the heat conducting plate 3 is located on one side of the heat conducting plate 3 adjacent to the lower electric core assembly, and the other is located on one side of the heat conducting plate 3 adjacent to the upper electric core assembly.

In some embodiments of the present invention, the body 11 includes a first connecting portion and a second connecting portion welded to the first connecting portion, and the flange 31 is attached to the body 11 (refer to fig. 7) to shield the welding position of the first connecting portion and the second connecting portion. It can be understood that, when the welding position of the flanging 31 and the body 11 is opposite and attached, the thickness of the welded base metal can be increased, and the body 11 is prevented from being welded through due to the fact that the thickness of the body 11 is too thin, so that the structural strength of the welded body 11 can be ensured. For example, in one example of the present invention, the body 11 is a rectangular plate with opposite ends joined by laser welding.

In some embodiments of the present invention, both cover plates 12 are welded to the body 11. The welded connection has the advantages of simple process and easy connection, and the tight connection of the two cover plates 12 and the body 11 can be realized through the welded connection. In addition, the cost can be reduced while the connecting strength of the two cover plates 12 and the body 11 is ensured.

In some embodiments of the invention, the body 11 is a single piece. From this, the stability of body 11 structure, performance not only can be guaranteed to the structure of an organic whole to convenient shaping, manufacturing are simple, have saved unnecessary assembly part and connection process moreover, have improved the assembly efficiency of body 11 greatly, guarantee the reliability that body 11 connects, and moreover, the bulk strength and the stability of the structure of an organic whole formation are higher, and it is more convenient to assemble, and the life-span is longer.

In some embodiments of the present invention, the electric core assembly 2 is provided with multiple layers, and a heat conducting plate 3 is disposed between two adjacent electric core assemblies 2. It can be understood that the heat that adjacent two-layer electric core subassembly 2 produced all can be absorbed by heat-conducting plate 3, from this only need set up a heat-conducting plate 3 alright with the heat transfer that realizes two-layer electric core subassembly 2 to can reduce the use quantity of heat-conducting plate 3, be favorable to reducing battery 100's thickness, thereby can realize battery 100's miniaturization.

In some embodiments of the present invention, the electric core assemblies 2 are in an even number of layers, and two adjacent electric core assemblies 2 are connected in series. It is understood that the electric core assembly 2 may be 2, 4, 6 or more layers. By connecting the adjacent two layers of the core assembly 2 in series, a predetermined voltage can be supplied, and the series connection is relatively simple, while the occupied internal space can be reduced.

For example, in one example of the present invention, the electric core assemblies 2 are arranged in an even number of layers, two adjacent layers of electric core assemblies 2 are connected in series, and the arrangement of the positive and negative poles of two adjacent layers of pole core assemblies 21 is opposite.

Of course, the present invention is not limited thereto, and the electric core assembly 2 may have an odd number of layers. For example, in one example of the present invention, the cell assembly 2 has 3 layers, and the first layer of cell assembly 2 is connected in parallel with the second layer of cell assembly 2 and then connected in series with the third layer of cell assembly 22. Specifically, in one example of the present invention, the electric core assembly 2 has three layers, the arrangement of the positive and negative poles of the first layer of the electrode core assembly 21 is the same as that of the second layer of the electrode core assembly 21, and the arrangement of the positive and negative poles of the third layer of the electrode core assembly 21 is opposite to that of the first and second layers of the electrode core assemblies.

According to some embodiments of the present invention, the heat conductive plate 3 is thermally connected to the surface of the pole core group 21 in the thickness direction. It can be understood that the surface of the pole core group 21 in the thickness direction is the largest, so that the heat exchange area between the pole core group 21 and the heat conducting plate 3 can be increased, and the heat exchange efficiency between the heat conducting plate 3 and the pole core group 21 can be improved. Here, the thickness direction of the electrode core assembly 21 is understood as the direction in which the electrode core assemblies 2 are stacked, and the thickness direction of the electrode core assembly 21 may also be considered as the thickness direction of the battery 100.

According to some embodiments of the present invention, the electric core assembly 2 further comprises a plurality of insulation films, and the plurality of insulation films respectively wrap the plurality of pole core groups 21 in a one-to-one correspondence. It can be understood that an insulating film is arranged outside each pole-core group 21, and electrolyte can be injected into the insulating film, so that the electrolyte is not shared among the pole-core groups 21, an internal short circuit cannot occur, and the electrolyte cannot be decomposed due to potential difference.

The insulating film has certain insulation and electrolyte corrosion resistance, and the material of the insulating film is not particularly limited as long as the insulating film can insulate and does not react with the electrolyte, and in some embodiments, the material of the insulating film may include a polypropylene (PP) or Polyethylene (PE) film.

In one example of the present invention, when each pole core group 21 is wrapped with an insulation film, the heating sheet is in direct contact with the insulation film or a heat conductive paste is disposed therebetween.

In some embodiments of the present invention, as shown in fig. 2, the battery includes two layers of cell assemblies 2, each layer of cell assembly 2 includes a plurality of pole core groups 21, the plurality of pole core groups 21 of each layer of cell assembly 2 are connected in series by a plurality of first connecting members 41, and two pole core groups 21 of the same end in the two layers of cell assemblies 2 are connected by a second connecting member 42 to connect the two layers of cell assemblies 2 in series.

It is understood that the plurality of pole core groups 21 connected in series can maximize the power storage capacity of the pole core assembly 2, thereby storing more electric energy. The series connection of the plurality of pole core groups 21 can be realized by using the first connecting member 41 and the second connecting member 42, and the complexity of the connection structure of the plurality of pole core groups 21 can be reduced by the first connecting member 41 and the second connecting member 42, thereby improving the reliability of the connection of the plurality of pole core groups 21 and the efficiency of the connection assembly.

According to some embodiments of the invention, as shown in fig. 1, the housing 1 is a metal piece, preferably the housing 1 is an aluminum piece. The aluminium part can provide better guard action for inside electric core subassembly 2, and the aluminium part still provides good heat conduction function simultaneously. In addition, the aluminum member has an advantage of light weight, which is advantageous for reducing the overall weight of the battery 100.

A battery module according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

The battery module according to an embodiment of the present invention includes the above battery 100.

Specifically, in one example of the present invention, the battery module includes a first housing and the battery 100, and the battery 100 may be plural, and the plural batteries 100 are accommodated in the first housing.

According to the battery module provided by the embodiment of the invention, the heat-conducting plate 3 is arranged in the shell 1 of the battery 100, and the heat-conducting plate 3 is in heat-conducting connection with the battery core assembly 2 and the shell 1, when the battery 100 works, heat generated by the battery core assembly 2 can be transferred to the shell 1 through the heat-conducting plate 3, and then the heat is transferred outwards through the shell 1, so that the temperature in the battery 100 can be reduced, the working safety of the battery 100 is improved, and the service life of the battery core is prolonged. In addition, the plurality of pole core groups 21 are connected in series, and high voltage output of the battery 100 can be realized, so that the high voltage requirement of the user on the battery 100 can be met.

A battery pack according to an embodiment of the present invention is described below with reference to the accompanying drawings.

The battery pack according to an embodiment of the present invention includes the battery module or the battery 100.

Specifically, in one example of the present invention, the battery pack includes a second housing and a plurality of battery modules, and the plurality of battery modules may be accommodated in the second housing.

According to the battery pack provided by the embodiment of the invention, the heat-conducting plate 3 is arranged in the shell 1 of the battery 100, and the heat-conducting plate 3 is in heat-conducting connection with the electric core assembly 2 and the shell 1, when the battery 100 works, heat generated by the electric core assembly 2 can be transferred to the shell 1 through the heat-conducting plate 3, and then the heat is transferred outwards through the shell 1, so that the temperature in the battery 100 can be reduced, the working safety of the battery 100 is improved, and the service life of the electric core is prolonged. In addition, the plurality of pole core groups 21 are connected in series, and high voltage output of the battery 100 can be realized, so that the high voltage requirement of the user on the battery 100 can be met.

An electric vehicle according to an embodiment of the present invention is described below with reference to the accompanying drawings.

The electric vehicle comprises the battery pack.

According to the electric vehicle provided by the embodiment of the invention, the heat conducting plate 3 is arranged in the shell 1 of the battery 100, and the heat conducting plate 3 is in heat conducting connection with the battery core assembly 2 and the shell 1, when the battery 100 works, heat generated by the battery core assembly 2 can be transferred to the shell 1 through the heat conducting plate 3, and then the heat is transferred outwards through the shell 1, so that the temperature in the battery 100 can be reduced, the working safety of the battery 100 is improved, and the service life of the battery core is prolonged. In addition, the plurality of pole core groups 21 are connected in series, and high voltage output of the battery 100 can be realized, so that the high voltage requirement of the user on the battery 100 can be met.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery, comprising:

a housing;

the at least one layer of the battery pack is arranged in the shell and comprises a plurality of pole core groups, the pole core groups of each layer of the battery pack are connected in series, and when the battery pack is multi-layer, the multi-layer battery packs are electrically connected;

the heat-conducting plate, the heat-conducting plate is established in the casing, the casing with the electric core subassembly all with the heat-conducting plate heat conduction is connected.

2. The battery of claim 1, wherein the plurality of pole core groups of the pole core assembly are arranged along a first direction, the pole core group comprises a first electrode lead-out member and a second electrode lead-out member for leading out current, and the first electrode lead-out member and the second electrode lead-out member are respectively disposed on two sides of the pole core group along the first direction.

3. The battery according to claim 2, wherein the case includes a body and two cover plates, the two cover plates are disposed at opposite ends of the body to enclose an inner space of the body, and one of the two cover plates is provided with an electrode terminal for drawing out current.

4. The battery of claim 3, wherein the thermally conductive plate has a first end and a second end in a second direction, the second direction being perpendicular to the first direction, at least one of the first end and the second end having a flange, the flange engaging the inner wall of the body.

5. The battery of claim 4, wherein the first end and the second end of the heat-conducting plate are both provided with the flanges, and the two flanges are located on the same side or both sides of the heat-conducting plate.

6. The battery of claim 4, wherein the body comprises a first connecting portion and a second connecting portion welded to the first connecting portion, and the flange is attached to the body to shield the welding portion of the first connecting portion and the second connecting portion.

7. The battery of claim 3, wherein the body is a unitary piece.

8. The battery of claim 3, wherein the cell assembly is provided with a plurality of layers, and the heat conducting plate is arranged between two adjacent layers of the cell assembly.

9. The cell defined in claim 8, wherein the cell assemblies are in an even number of layers, and two adjacent layers of the cell assemblies are connected in series.

10. The battery according to claim 1, wherein the heat conductive plate is thermally conductive-coupled to a thickness-directional surface of the electrode core pack.

11. The battery of claim 1, wherein the cell assembly further comprises a plurality of insulating films, and the insulating films respectively wrap the plurality of pole core assemblies in a one-to-one correspondence.

12. A battery module characterized by comprising the battery according to any one of claims 1 to 11.

13. A battery pack comprising the battery according to any one of claims 1 to 11 or the battery module according to claim 12.

14. An electric vehicle characterized by comprising the battery pack according to claim 13.