CN113140831A

CN113140831A - Battery pack and battery module

Info

Publication number: CN113140831A
Application number: CN202110355947.4A
Authority: CN
Inventors: 凌万秾
Original assignee: Jiangmen Yuanxi Technology Co ltd
Current assignee: Jiangmen Yuanxi Technology Co ltd
Priority date: 2021-04-01
Filing date: 2021-04-01
Publication date: 2021-07-20

Abstract

The invention discloses a battery assembly and a battery module, wherein the battery assembly comprises a shell and a plurality of heating elements, and a battery core is arranged in the shell; the outside of heating element is provided with the insulating layer, and a plurality of heating element clamp locate the inside of electric core, and heating element electric connection has two heating utmost point ears, and two heating utmost point ears can be connected with external power source. The invention has high heating efficiency and uniform temperature distribution, and effectively improves the charging and discharging performance of the battery.

Description

Battery pack and battery module

Technical Field

The invention relates to the technical field of batteries, in particular to a battery assembly and a battery module.

Background

The charging and discharging performance of the power battery in a low-temperature environment is poor, the power battery generally needs to be heated, and the conventional power battery generally winds a heating film on the outer side to heat the power 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 assembly which has high heating efficiency and uniform temperature distribution and effectively improves the charging and discharging performance of the battery.

The invention also provides a battery module with the battery component.

A battery assembly according to an embodiment of the first aspect of the invention includes: the battery comprises a shell, wherein a battery cell is arranged in the shell; the heating element comprises a plurality of heating elements, an insulating layer is arranged on the outer side of each heating element, the heating elements are clamped and arranged inside the battery core, the heating elements are electrically connected with two heating lugs, and the two heating lugs can be connected with an external power supply.

The technical scheme at least has the following beneficial effects: through setting up heating element in the inside of electric core, and the insulating layer makes heating element and electric core insulating, when heating battery under the low temperature environment, heating element can directly heat electric core, removes the heat conduction process of casing from, reduces calorific loss, and heating efficiency is high, and it is effectual to heat, and temperature distribution is even in the electric core, effectively improves the charging and the discharge performance of battery fast.

According to some embodiments of the invention, the housing is provided with a seal, both of the heating tabs are provided with a package, and both of the packages are fixedly mounted to the seal.

According to some embodiments of the invention, one end of the package extends outwardly beyond the seal and the other end extends into the housing.

According to some embodiments of the present invention, the sealing member is provided in an annular structure, and the sealing member is sleeved outside the heating tab.

According to some embodiments of the invention, the package is provided as a tab glue, which is glued to the heating tab.

According to some embodiments of the invention, the heating element comprises a first insulating layer, a second insulating layer and a heat generating layer, the heat generating layer is sandwiched between the first insulating layer and the second insulating layer, and the heat generating layer is connected with the two heating tabs.

According to some embodiments of the invention, the heating layer is provided as a heating wire, the heating wire is in a surrounding structure, and two ends of the heating wire are respectively connected with the two heating tabs.

According to some embodiments of the invention, the heat generating layer is provided as a graphene heat generating chip.

According to some embodiments of the invention, the first insulating layer and the second insulating layer are each provided as a flexible film.

A battery module according to an embodiment of a second aspect of the present invention includes a plurality of the battery modules of the above-described embodiment of the first aspect, and the plurality of the battery modules are connected in series or in parallel.

The technical scheme at least has the following beneficial effects: through setting up heating element in the inside of electric core, when heating battery under the low temperature environment, heating element can directly heat electric core, removes the heat conduction process of casing from, reduces calorific loss, and the heating efficiency is high, and the heating effect is good, and the temperature distribution is even in the electric core, effectively improves the charging and discharge performance of every battery pack and battery module fast.

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 pack according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a winding structure cell according to a first embodiment of the present invention;

FIG. 3 is a schematic view of a heating element according to a first embodiment of the present invention;

FIG. 4 is a side cross-sectional view of a heating element according to a first embodiment of the present invention;

fig. 5 is a schematic structural diagram of a laminated structure cell in a second embodiment of the present invention;

FIG. 6 is a schematic structural view of a battery pack according to a third embodiment of the present invention;

fig. 7 is a schematic structural view of a battery module according to a fourth embodiment of the present invention;

fig. 8 is a schematic structural view of a battery module according to a fifth embodiment of the present invention.

Reference numerals:

a battery module 10;

the battery assembly 100, the soft case 110, the seal 111, the hard case 120, the cover 121, the positive electrode post 1211, the negative electrode post 1212, the first heating electrode post 1213, the second heating electrode post 1214, the battery cell 130, the winding structure battery cell 131, and the lamination structure battery cell 132;

the heating element comprises a heating element 200, a first insulating layer 210, a second insulating layer 220, a heat generating layer 230, a terminal 240, a heating tab 250, a packaging member 251 and an insulating member 252.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does 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, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

The first embodiment is as follows:

referring to fig. 1 and 2, the present invention provides a battery assembly 100 including a case and a plurality of heating elements 200. The shell is a soft shell 110 of a soft package battery, and has flexibility, and a seal 111 is provided, a battery cell 130 is provided in the shell, the battery cell 130 is a winding structure battery cell 131, an anode and a cathode of the winding structure battery cell 131 are respectively directly led out from the seal 111 to the outside of the soft shell 110, and are sealed and encapsulated in an insulating manner, one heating element 200 is provided, an insulating layer is provided on the outer side of the heating element 200, the heating element 200 is clamped at a central hole of the winding structure battery cell 131, and the insulating layer insulates the heating element 200 from the winding structure battery cell 131, of course, a plurality of heating elements 200, such as two, three or more, may be provided according to a heating requirement, and the plurality of heating elements 200 are respectively provided between the central hole of the winding structure battery cell 131 and a winding layer; the heating element 200 is generally provided with two terminals 240 arranged at intervals, which are respectively a current input end and a current output end of the heating element 200, the two terminals 240 are respectively electrically connected with heating tabs 250, the heating tabs 250 are connected with the terminals 240 in a welding manner, and the welding connection manner is stable and reliable, of course, the heating tabs 250 can be integrated with the heating element 200 into a whole structure, that is, the heating tabs 250 are directly led out from the inside of the heating element 200, or the heating tabs 250 are directly surrounded and packaged by viscose glue and connected with the terminals 240, so that the welding step can be omitted, and the production efficiency can be improved; two heating utmost point ear 250 extend to same one side of heating element 200, two heating utmost point ears 250 are the same from sealing 111 directly drawing out to the outside of soft shell 110, and insulating seal encapsulation, thereby, heating element 200 can be connected with external power source, when heating battery under low temperature environment, heating element 200 can directly heat winding structure electricity core 131, remove the heat conduction process of casing from, reduce calorific loss, heating efficiency is high, the heating effect is good, and temperature distribution is even in electricity core 130, effectively improve the charging and the discharge performance of battery fast.

Referring to fig. 1 and 3, in some embodiments, both heating tabs 250 are provided with a packing member 251, the packing member 251 is provided in the middle of the heating tabs 250, the packing member 251 has sealing and insulating functions, and when installed, the heating element 200 is inserted into the electric core 130, the heating tab 250 is led out from the seal 111 to the outside of the soft shell 110, meanwhile, the package member 251 is fixed at the seal 111, the package member 251 can fix the heating tab 250 to the seal 111 on one hand, and can insulate the heating tab 250 from the soft case 110 on the other hand, and can seal laminate polymer battery's the 111 that seal, connect heating utmost point ear 250 in external power supply can directly heat electric core 130, and heating temperature distributes evenly, and heating efficiency is high, effectively deals with the poor problem of charge-discharge performance under the low temperature environment, and packaging structure is simple, and the equipment production of being convenient for improves production efficiency.

Referring to fig. 1, in some embodiments, one end of the packing member 251 extends outward from the seal 111, and the other end extends into the soft shell 110, so as to increase the insulation effect between the heating tab 250 and the soft shell 110 and improve the safety performance.

Referring to fig. 3, in some embodiments, the package member 251 is configured to be an annular structure, the package member 251 is directly sleeved on the outer side of the heating tab 250, the assembly is convenient, and when the heating tab 250 is packaged at the seal 111, the heating tab 250 and the soft shell 110 can be insulated along the circumferential direction of the package member 251, the insulation effect is good, and electric leakage is avoided.

In some embodiments, the package member 251 is made of tab glue, the tab glue is made of polypropylene, polyethylene or other hot melt adhesives, the tab glue is directly bonded to the heating tab 250, the assembly is convenient, the production efficiency is improved, the sealing performance and the insulating performance of the tab glue are good, the sealing performance of the package and the insulating performance between the heating tab 250 and the soft shell 110 are effectively improved, and it can be understood that the material of the tab glue is not limited to the above description as long as the sealing and the insulating can be achieved.

Referring to fig. 4, in some embodiments, the heating element 200 includes a first insulating layer 210, a second insulating layer 220, and a heat generating layer 230, the heat generating layer 230 is sandwiched between the first insulating layer 210 and the second insulating layer 220, an edge of the first insulating layer 210 is hermetically connected to an edge of the second insulating layer 220, the first insulating layer 210 and the second insulating layer 220 are insulating layers disposed outside the heating element 200, and the heat generating layer 230 is electrically connected to two terminals 240, that is, the heat generating layer 230 is connected to two heating tabs 250, so that the heat generating layer 230 can be powered to heat the electric core 130, and charge and discharge performance of the battery in a low temperature environment is improved.

Referring to fig. 3, in some embodiments, the heating layer 230 is configured as a heating wire, the heating wire is disposed between the first insulating layer 210 and the second insulating layer 220 in a surrounding structure, and forms a plurality of heating rings, two ends of the heating wire are respectively connected by two terminals 240, that is, two ends of the heating wire are respectively connected with two heating tabs 250, so that the electric core 130 can be uniformly heated, and the charging and discharging performance of the battery in a low temperature environment can be further improved.

In some embodiments, the heating layer 230 is configured as a graphene heating chip, and the graphene heating chip is electrically connected to the two terminals 240, that is, the graphene heating chip is connected to the two heating tabs 250, so that the heat conduction performance of the graphene heating chip can increase the heating rate, and the constant temperature state can be maintained when the temperature reaches the set temperature, thereby saving electric energy.

In some embodiments, the heating layer 230 is a PTC heater, which has low thermal resistance and high heat exchange efficiency, and has an automatic constant temperature function to save electric energy. Of course, it is understood that the structural form of the heat generating layer 230 is not limited to the above description, and may be other structural forms.

In some embodiments, the first insulating layer 210 and the second insulating layer 220 are both provided as flexible films, so that the heating element 200 has a small volume, a small occupied space, and a high energy density under the same battery volume, and the heating element 200 with flexibility can be bent into different shapes, can be installed according to different installation spaces, and has good versatility.

Referring to fig. 3, in some embodiments, an insulating member 252 is disposed at a welding position of the heating tab 250 and the terminal 240, the insulating member 252 completely covers the welding position, and the insulating member 252 is made of polypropylene, polyethylene or other hot melt adhesives, so that the welding position can be insulated, electric leakage can be prevented, and the connection of the heating tab 250 can be more stable and reliable to a certain extent.

Example two:

referring to fig. 1 and 5, the difference from the previous embodiment is that the battery cell 130 is configured as a lamination structure battery cell 132, the heating element 200 is clamped between two adjacent laminations, the heating elements 200 are respectively clamped between two adjacent laminations, and other structures are the same as those in the previous embodiment, therefore, the heating element 200 can be connected with an external power supply, when the battery is heated in a low-temperature environment, the heating element 200 can directly heat the lamination structure battery cell 132, the heat conduction process of the casing is omitted, the heat loss is reduced, the heating efficiency is high, the heating effect is good, the temperature distribution in the battery cell 130 is uniform, and the charging and discharging performance of the battery is effectively and rapidly improved.

Example three:

referring to fig. 6, the difference from the two embodiments is that the casing is a hard shell 120 of an aluminum-casing battery, the hard shell 120 is connected to a cover 121, the cover 121 is provided with a positive pole 1211, a negative pole 1212, a first heating pole 1213 and a second heating pole 1214, the battery cell 130 can be a winding battery cell 131 or a lamination battery cell 132, the heating element 200 is clamped in the battery cell 130, two tabs of the battery cell 130 are respectively welded to the positive pole 1211 and the negative pole 1212, two heating tabs 250 of the heating element 200 are respectively directly welded to the first heating pole 1213 and the second heating pole 1214, the structure is simple, therefore, when the battery is heated in a low-temperature environment, the heating element 200 can directly heat the battery cell 130, the heat conduction process of the hard shell 120 is omitted, the heat loss is reduced, the heating efficiency is high, the heating effect is good, the temperature distribution in the battery core 130 is uniform, and the charging and discharging performance of the battery is effectively and rapidly improved.

Example four:

referring to fig. 7, the present invention provides a battery module 10, where the battery module 10 includes a plurality of battery assemblies 100 in the first to third embodiments, the plurality of battery assemblies 100 are connected in series, where a plurality of heating elements 200 in the plurality of battery assemblies 100 are also connected in series, and certainly, the plurality of heating elements 200 may also be connected in parallel, so that, in a low-temperature environment, the heating elements 200 are connected to an external power supply, and can directly heat a plurality of battery cells 130, a heat conduction process of a housing is omitted, heat loss is reduced, heating efficiency is high, a heating effect is good, temperature distribution in the battery cells 130 is uniform, and charging and discharging performance of the battery module 10 is effectively and rapidly improved.

Example five:

referring to fig. 8, the present invention provides another battery module 10, where the battery module 10 includes a plurality of battery assemblies 100 in one of the first to third embodiments, the battery assemblies 100 are connected in parallel, where a plurality of heating elements 200 in the battery assemblies 100 are also connected in parallel, and certainly, the plurality of heating elements 200 may also be connected in series, so that, in a low-temperature environment, the heating elements 200 are connected to an external power supply, and can directly heat a plurality of battery cells 130, a heat conduction process of a casing is omitted, heat loss is reduced, heating efficiency is high, a heating effect is good, temperature distribution in the battery cells 130 is uniform, and charging and discharging performance of the battery module 10 is effectively and rapidly improved.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. A battery assembly, comprising:

the battery comprises a shell, wherein a battery cell is arranged in the shell;

the heating element comprises a plurality of heating elements, an insulating layer is arranged on the outer side of each heating element, the heating elements are clamped and arranged inside the battery core, the heating elements are electrically connected with two heating lugs, and the two heating lugs can be connected with an external power supply.

2. A battery assembly according to claim 1, wherein: the casing is provided with and seals, two heating utmost point ear all is provided with the packaging part, two the equal fixed mounting of packaging part in seal.

3. A battery assembly according to claim 2, wherein: one end of the packaging part extends out of the seal, and the other end of the packaging part extends into the shell.

4. A battery assembly according to claim 3, wherein: the packaging part is of an annular structure, and the packaging part is sleeved on the outer side of the heating pole lug.

5. A battery assembly according to claim 3, wherein: the packaging part is made of tab glue, and the tab glue is adhered to the heating tab.

6. A battery assembly according to claim 1, wherein: the heating element comprises a first insulating layer, a second insulating layer and a heating layer, the heating layer is clamped between the first insulating layer and the second insulating layer, and the heating layer is connected with the two heating lugs.

7. A battery assembly according to claim 6, wherein: the heating layer is set as a heating wire, the heating wire is of a surrounding structure, and two ends of the heating wire are connected with the two heating tabs respectively.

8. A battery assembly according to claim 6, wherein: the heating layer is arranged to be a graphene heating chip.

9. A battery assembly according to claim 6, wherein: the first insulating layer and the second insulating layer are both provided as flexible films.

10. A battery module, its characterized in that: the battery pack comprises a plurality of battery packs as claimed in any one of claims 1 to 9, wherein the plurality of battery packs are connected in series or in parallel.