CN214378681U - Battery core, battery module and battery pack - Google Patents

Abstract

The utility model relates to a battery technology field provides an electricity core, battery module and battery package. The battery cell comprises: a cell shell; the battery cell pole is arranged in the battery cell shell, and one end of the battery cell pole is positioned outside the battery cell shell; the battery core assemblies are arranged inside the battery core shell; the inner heat insulation pad is arranged between the plurality of electric core assemblies and used for separating any two electric core assemblies in the plurality of electric core assemblies. The utility model has the advantages that the inner heat insulation pad is arranged to relieve the expansion force between the electric core components, and the electrical property of the electric core is improved; the arranged inner heat insulation pad can also prevent the short circuit inside the battery cell caused by the damage of the diaphragm on the surface of the battery cell component; simultaneously, the heat-conduction between the electric core subassembly can also be alleviated to the interior heat insulating pad that sets up, promotes the security of electric core, and the design simple process of electric core, the practicality is strong.

Description

Battery core, battery module and battery pack

Technical Field

The utility model relates to a battery technology field particularly, relates to an electricity core, battery module and battery package.

Background

Generally, a battery pack is assembled by a plurality of battery modules, and main components include a case, a module, a wire harness, a control/management unit, and the like. In the prior art, as shown in fig. 1, a battery module is formed by welding and assembling battery cells 100 in a series/parallel manner, and the main components include the battery cells 100, module end plates 204, module side plates 202, and an external thermal insulation pad 206. As shown in fig. 2, the main components of the battery cell 100 include a battery core assembly 104, a battery cell casing 102, and a battery cell post 108.

In the practical application process, the following problems exist:

1. due to aging, gas generation and pole piece expansion inside the battery core 100, the battery core 100 is often expanded, and the expansion and extrusion among the battery cores 100 can affect the electrical performance of the battery module, and the safety risk of the module end plate 204 and the module side plate 202 cracking exists;

2. when the battery cell 100 is out of control, the adjacent battery cell 100 is easily affected, so that the adjacent battery cell 100 is out of control, and safety accidents such as thermal diffusion and the like are caused;

3. mutual expansion extrusion occurs between the electric core assemblies 104 inside the electric core 100, and the aging aggravation of the diaphragm on the surface of the electric core assemblies 104 can be caused, the diaphragm can be damaged under extreme conditions, and the short circuit occurs between the electric core assemblies 104, so that the electric core 100 is in thermal runaway.

To the above problem, the solution of trade is through increasing outer heat insulating mattress 206 between electric core 100 to alleviate electric core 100 expansive force each other and alleviate the expansive force of battery module, solve electric core 100 heat-conduction problem each other, promote the electrical property and the security of battery module. However, the above method cannot solve the problems of expansion force, heat conduction and risk of short circuit of the core components 104 inside the battery cell 100.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving at least and having the problem of bulging force, heat-conduction and short circuit risk between the electric core subassembly that exists among the prior art.

Therefore, an object of the present invention is to provide an electrical core.

Another object of the present invention is to provide a battery module.

It is still another object of the present invention to provide a battery pack.

In order to achieve the above object, an embodiment of the first aspect of the present invention provides an electrical core, including: a cell shell; the battery cell pole is arranged in the battery cell shell, and one end of the battery cell pole is positioned outside the battery cell shell; the battery core assemblies are arranged inside the battery core shell; the inner heat insulation pad is arranged between the plurality of electric core assemblies and used for separating any two electric core assemblies in the plurality of electric core assemblies.

The utility model discloses above-mentioned embodiment provides an electric core, interior heat insulating pad sets up between two adjacent electric core subassemblies to two liang separate two electric core subassemblies. Therefore, the expansion force between the cell components can be relieved through the inner heat insulation pad, and the electrical property of the cell is improved. The condition that the short circuit risk appears in the electricity core inside that leads to because of the damage of electricity core subassembly surface diaphragm can also be stopped to the interior heat insulating pad that sets up. Simultaneously, the heat-conduction between the electric core subassembly can also be alleviated to the interior heat insulating pad that sets up, promotes the security of electric core. The design process of the battery cell is simple, and the practicability is high.

Additionally, the utility model provides an electricity core in above-mentioned embodiment can also have following additional technical characterstic:

among the above-mentioned technical scheme, be provided with interior heat insulating pad between electric core casing and a plurality of electric core subassembly.

In this scheme, the interior heat insulating pad that sets up between electric core casing and electric core subassembly can relieve the bulging force between electric core subassembly and the electric core casing, promotes the electrical property of electric core. And the risk of electric leakage short circuit between the surface diaphragm of the cell component and the cell shell is avoided. Meanwhile, heat conduction between the battery core assembly and the battery core shell can be relieved, and the safety of the battery core is further improved.

In any of the above technical solutions, the inner heat insulating pad includes a mylar sheet material inner heat insulating pad.

In this scheme, heat insulating pad in wheat pulling-on piece material possesses heat resistance, anticorrosive and the advantage that can cushion. Therefore, after the battery cell is used between the battery cell assemblies, the electrical performance and the safety performance of the battery cells can be further improved.

In any of the above technical solutions, the inner thermal insulation pad includes a phase change material inner thermal insulation pad.

In the scheme, the phase-change material has the characteristics of high-temperature heat absorption and low-temperature heat release, so that after the heat insulation pad in the phase-change material is arranged inside the battery cell, the internal temperature of the battery cell can be self-adaptively adjusted through the self characteristics of the phase-change material, and the electrical property and the safety performance are further improved.

In any of the above technical solutions, the battery cell includes a square battery cell.

In any of the above technical solutions, the surface of each electric core component is covered with a membrane.

In this scheme, the diaphragm parcel can play insulating effect at electric core subassembly surface, prevents to take place trouble such as short circuit between the electric core subassembly.

An embodiment of the second aspect of the present invention provides a battery module, including: a plurality of electric cores in any one above-mentioned technical scheme.

The utility model discloses above-mentioned embodiment provides a battery module, because battery module comprises the electric core assembly among the above-mentioned arbitrary technical scheme, consequently battery module has just also possessed whole beneficial effect above, no longer gives unnecessary details here.

In any one of the above technical solutions, the battery module further includes: module end plates and module side plates. The module side plate and the module end plate are installed in a matched mode to form a module shell; a plurality of electric cores set up inside the module casing.

In this scheme, the module casing that comprises module end plate and module curb plate sets up a plurality of electric cores inside as the shell of battery module to constitute complete battery module.

In any one of the above technical solutions, the battery module further includes: the outer heat insulation pad is arranged between the plurality of battery cells and used for separating any two battery cells in the plurality of battery cells.

In this scheme, the outer heat insulating mattress that sets up between electric core can alleviate bulging force and heat-conduction between electric core and the electric core through outer heat insulating mattress. Thereby promote battery module's electrical property (like circulation performance), reduce the risk that battery module bursts apart, promote battery module's security.

Among any one of the above-mentioned technical scheme, be provided with outer heat insulating mattress between module casing and a plurality of electric core.

In this scheme, the outer heat insulating mattress that sets up between module casing and electric core can alleviate the bulging force between electric core and the module casing and heat-conduction between electric core and the module casing to further promote the electrical property and the security of battery module.

In any of the above technical solutions, the outer insulation mat comprises an outer insulation mat of mylar sheet material.

In this scheme, the outer heat insulating mattress of mylar material possesses heat resistance, anticorrosive and the advantage that can cushion. Therefore, after the battery module is used between the battery cells, the electrical performance and the safety performance of the battery module can be further improved.

In any of the above technical solutions, the outer thermal insulation mat includes a phase change material outer thermal insulation mat.

In this scheme, phase change material has the heat absorption of high temperature, the exothermic characteristics of low temperature, consequently sets up the inside back of battery module with the outer heat insulating mattress of phase change material, can adjust the inside temperature of battery module through phase change material's self characteristics self-adaptation to improve the electrical property and the security performance of battery module one step more.

An embodiment of the third aspect of the present invention provides a battery pack, including a battery module according to any one of the above technical solutions.

In this scheme, because the battery package is formed by the assembly of the battery module in any one above-mentioned technical scheme, consequently has just possessed above whole beneficial effect, no longer gives details here.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, 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 module in the prior art;

fig. 2 is a schematic structural diagram of a cell in the prior art;

fig. 3 is a schematic structural diagram of a battery cell in an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a battery module according to an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 4 is:

100 cells, 102 cell shells, 104 cell components, 106 internal insulation pads, 108 cell poles, 202 module side plates, 204 module end plates, 206 external insulation pads.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

The following describes the battery cell, the battery module, and the battery pack according to some embodiments of the present invention with reference to fig. 3 to 4.

As shown in fig. 3, an embodiment of the first aspect of the present invention provides a battery cell 100, where the battery cell 100 includes: a cell casing 102, a cell post 108, a plurality of cell components 104, and an internal thermal insulation pad 106. The cell pole 108 is disposed inside the cell casing 102, and one end of the cell pole 108 is located outside the cell casing 102. The surface of each electric core assembly 104 is covered with a membrane, and short circuit between the electric core assemblies 104 can be avoided through the covered membrane. A plurality of core assemblies 104 are mounted inside the cell casing 102, and an internal thermal insulation pad 106 is disposed between each two core assemblies 104.

The above embodiment of the present invention provides an electrical core 100, which separates two by two electrical core assemblies 104 through the inner heat insulation pad 106 disposed between the electrical core assemblies 104. This may reduce the expansion force between the core assemblies 104 by the deformation of the inner insulation pads 106 themselves, and thus may improve the electrical performance of the battery cell 100, such as the cycle performance of the battery cell 100.

Meanwhile, the inner heat insulation pad 106 also avoids the mutual abrasion and extrusion between the electric core assemblies 104, so that the damage of the diaphragm caused by abrasion and extrusion between the electric core assemblies 104 can be effectively avoided, the short circuit between the electric core assemblies 104 can be further avoided, and the safety performance of the electric core 100 can be effectively improved.

Moreover, the inner heat insulation pad 106 can also relieve the heat conduction between the electric core assemblies 104, and when one of the electric core assemblies 104 is out of control thermally, the inner heat insulation pad 106 can avoid the heat conduction from reaching the adjacent electric core assemblies 104 under the insulation effect. Therefore, the condition of chain reaction among the plurality of electric core assemblies 104 is avoided, and the occurrence of safety accidents such as heat diffusion and the like is greatly reduced.

It should be noted that the types of the battery cell 100 are mainly classified into a cylindrical shape, a soft bag shape, and a square shape, and in this embodiment, a square battery cell is preferable. The cell component 104 of the square cell is formed by assembling a positive plate, a negative plate and a diaphragm through the processes of winding/laminating, welding and the like.

In some embodiments, an internal thermal insulation pad 106 is also disposed between the cell casing 102 and the plurality of cell assemblies 104. By providing an internal thermal insulation pad 106 between the cell casing 102 and the cell assembly 104, the expansion force between the cell assembly 104 and the cell casing 102 can be relieved to improve the electrical performance of the cell assembly 104. The single core assembly 104 may also be prevented from crushing the cell casing 102 after the single core assembly has failed to swell, thereby further improving the safety of the battery cell 100. Moreover, the heat conduction between the battery core assembly 104 and the battery core shell 102 can be relieved, and the heat conduction to the battery core shell 102 when the battery core assembly 104 is out of thermal runaway is prevented, so that other battery cells 100 can be further improved in safety performance of the battery cells 100.

In some embodiments, the inner insulating pad 106 is made of mylar. Mylar material has the advantages of heat resistance, corrosion resistance and buffering. Therefore, after being placed between the cell assemblies 104, the buffer device can play a role in buffering the expansion force between the cell assemblies 104 and the cell shell 102 by virtue of being self-buffering. By the advantages of heat resistance and corrosion resistance, when one electric core assembly 104 has thermal runaway fault, the electric core assembly can be effectively isolated from other electric core assemblies 104, and the electric core assembly 104 with thermal runaway can be prevented from affecting the surrounding electric core assemblies 104.

In some embodiments, the inner thermal insulation pad 106 is fabricated using a phase change material. Phase change material has the heat absorption of high temperature, the exothermic characteristics of low temperature, places it between electric core component 104 after, when electric core component 104 thermal runaway trouble appears, can give off a large amount of heats, and the heat that gives off can be absorbed to the interior heat insulating pad 106 of phase change material preparation to prevent that electric core component 104 that breaks down from spreading other electric core components 104. Meanwhile, when the temperature of the electric core assembly 104 is too low, the inner heat insulation pad 106 can release heat outwards, so that the electric core assembly 104 can keep a more suitable discharging temperature range, and the electric performance of the electric core assembly 104 is improved.

An embodiment of the second aspect of the present invention provides a battery module, as shown in fig. 4, the battery module includes the electric core 100 in any of the above embodiments.

The battery module that above-mentioned embodiment provided, owing to possessed electric core 100 in above-mentioned arbitrary embodiment, therefore this battery module has not only solved mutual bulging force and the heat-conduction problem of electric core 100, has still solved bulging force, heat-conduction and the problem that has the short circuit risk between the electric core subassembly 104 of electric core 100 inside, so has better electrical property and security performance.

In some embodiments, as shown in fig. 4, the battery module further includes: module end panels 204 and module side panels 202. The number of the module end plates 204 is two, and the two end plates are arranged oppositely. The two module side plates 202 are fixedly mounted on two sides of the two module end plates 204, respectively, so as to form a frame body, i.e., a module housing. A plurality of battery cells 100 are mounted inside the module case, thereby constituting a complete battery module.

In some embodiments, as shown in fig. 4, an external thermal insulation pad 206 is further disposed inside the battery module, and the external thermal insulation pad 206 is disposed between the plurality of battery cells 100, so as to isolate the battery cells 100 from each other. Like this, just can alleviate the bulging force and the heat-conduction between a plurality of electric cores 100 each other through outer heat insulating mattress 206, avoid influencing the electrical property of battery module because of the inflation extrusion of electric core 100 to and avoid electric core 100 to wave and electric core 100 on every side because of the thermal runaway, increased the security of battery module.

In some specific embodiments, an external thermal insulation pad 206 is also disposed between the module housing and the plurality of battery cells 100. The bulging force between electric core 100 and the module casing can be alleviated to outer heat insulating mattress 206 here, prevents that electric core 100 from extrudeing the module casing when the inflation that breaks down, leads to the module casing to burst apart. Simultaneously, also can prevent electric core 100 when taking place the thermal runaway and the heat-conduction between the module casing, avoid the module casing overheated, further promote battery module's security.

It should be noted that the outer insulation pad 206 may be made of the same material as the inner insulation pad 106, for example, mylar material or phase change material. After the same material is used as the inner insulation pad 106, the outer insulation pad 206 will also have all the advantages and benefits of the material, which will not be described herein again.

Specifically, the thicknesses of the inner insulation pad 106 and the outer insulation pad 206 may be appropriately adjusted according to actual conditions.

An embodiment of the third aspect of the present invention provides a battery pack, including a battery module according to any one of the above embodiments.

The utility model discloses the battery package that above-mentioned embodiment provided can be formed by the assembly of the battery module in a plurality of above-mentioned arbitrary embodiments, therefore this battery package has above whole beneficial effect, no longer gives unnecessary details here.

In the present application, the terms "first", "second", "third" 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 unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means 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.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. A battery cell (100), comprising:

a cell casing (102);

a cell pole (108) disposed inside the cell casing (102), one end of the cell pole being located outside the cell casing (102);

a plurality of cell assemblies (104) disposed inside the cell casing (102);

an inner thermal insulation pad (106) disposed between the plurality of electrical core assemblies (104) for insulating any two of the electrical core assemblies (104) in the plurality of electrical core assemblies (104).

2. The battery cell (100) of claim 1,

the inner heat insulation pad (106) is arranged between the cell shell (102) and the plurality of cell assemblies (104).

3. The battery cell (100) of claim 1 or 2, wherein the inner insulating pad (106) comprises:

a heat insulation pad in the Mylar material; or

A phase change material inner insulation pad.

4. The battery cell (100) of claim 3, wherein the battery cell (100) comprises a square-shaped cell.

5. The electrical core (100) of claim 3, wherein each of the core assemblies (104) is surface coated with a membrane.

6. A battery module, comprising:

a plurality of the battery cells (100) of any of claims 1 to 5.

7. The battery module according to claim 6, further comprising:

a module end plate (204);

the module side plate (202) is matched and mounted with the module end plate (204) to form a module shell;

a plurality of the battery cells (100) are arranged inside the module housing.

8. The battery module according to claim 7, further comprising:

an outer thermal insulation mat (206) disposed between the plurality of battery cells (100) for separating any two of the battery cells (100) of the plurality of battery cells (100).

9. The battery module according to claim 8,

the outer heat insulation pad (206) is arranged between the module shell and the plurality of battery cells (100).

10. The battery module according to claim 8 or 9, wherein the outer insulation mat (206) comprises:

an outer heat insulation mat of mylar sheet material; or

Phase change material outer insulation mat.

11. A battery pack, comprising:

the battery module according to any one of claims 6 to 10.

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