阅读说明：本技术 一种带加热膜的软包锂离子动力电池 (Soft package lithium ion power battery with heating film ) 是由 吴宁宁 单晓浩 安洪力 毛永志 于 2019-02-21 设计创作，主要内容包括：本发明属于软包锂离子动力电池领域,涉及一种带加热膜的软包锂离子动力电池,包括：由第一电芯(3-1)、第二电芯(3-2)组成的电芯主体(3),正极耳(1)和负极耳(2)设置在电芯主体(3)上,其特征在于：加热膜(6)由发热体(6-1)、第一层绝缘隔离膜(7-1)、第二层绝缘隔离膜(7-2)组成,加热膜(6)设置在第一电芯、第二电芯中间,第一层绝缘隔离膜、第二层绝缘隔离膜能够将发热体密封；发热体由一个发热体主体和两个发热体端头组成,一个发热体主体和两个发热体端头一体成型,发热体主体两端分别设置有延伸的发热体端头。本发明避免了发热体局部裸露时电解液的腐蚀,提高电池绝缘特性,向电芯散热均匀,安全性高,易于制造。(The invention belongs to the field of soft package lithium ion power batteries, and relates to a soft package lithium ion power battery with a heating film, which comprises: electric core main part (3) of constituteing by first electric core (3-1), second electric core (3-2), anodal ear (1) and negative pole ear (2) set up on electric core main part (3), its characterized in that: the heating film (6) consists of a heating body (6-1), a first layer of insulating isolation film (7-1) and a second layer of insulating isolation film (7-2), the heating film (6) is arranged between the first electric core and the second electric core, and the heating body can be sealed by the first layer of insulating isolation film and the second layer of insulating isolation film; the heating body consists of a heating body main body and two heating body ends, wherein the heating body main body and the two heating body ends are integrally formed, and the two ends of the heating body main body are respectively provided with the extended heating body ends. The invention avoids the corrosion of electrolyte when the heating element is partially exposed, improves the insulation characteristic of the battery, has uniform heat dissipation to the battery core, high safety and easy manufacture.)

1. A soft packet of lithium ion power battery of area heating membrane includes: electric core main part (3), heating film (6), anodal ear (1), negative pole ear (2) and plastic-aluminum membrane casing (5), electric core main part (3) comprise first electric core (3-1) and second electric core (3-2), anodal ear (1) and negative pole ear (2) set up on electric core main part (3), its characterized in that: the heating film (6) is arranged between the first electric core (3-1) and the second electric core (3-2), the electric core main body (3) and the heating film (6) are sealed inside by the aluminum plastic film shell (5), the heating film (6) consists of a heating body (6-1), a first layer of insulating isolation film (7-1) and a second layer of insulating isolation film (7-2), and the heating body (6-1) can be sealed by the first layer of insulating isolation film (7-1) and the second layer of insulating isolation film (7-2); the heating body (6-1) consists of a heating body main body (6-3) and two heating body ends (6-2), the heating body main body (6-3) and the two heating body ends (6-2) are integrally formed, the two ends of the heating body main body (6-3) are respectively provided with the extended heating body ends (6-2), and the heating film (6) and the aluminum plastic film shell (5) are integrally packaged through a first insulating isolating film (7-1) and a second insulating isolating film (7-2) at the position of the heating body ends (6-2).

2. The soft-package lithium ion power battery with the heating film according to claim 1, characterized in that: each heating element end (6-2) is provided with a rubber block (10), and the first layer of insulating isolation film (7-1) and the second layer of insulating isolation film (7-2) can completely seal the heating element main body (6-3) and the part of the heating element end provided with the rubber block (10).

3. The soft-package lithium ion power battery with the heating film according to claim 1, characterized in that: the two heating lugs (4) are respectively connected with two heating body ends (6-2), each heating lug (4) is provided with a rubber block (10), and the heating body (6-1) and the part of the heating lug provided with the rubber block (10) can be completely sealed by the first layer of insulating isolating film (7-1) and the second layer of insulating isolating film (7-2).

4. The soft-package lithium ion power battery with the heating film according to any one of claims 1 to 3, characterized in that: the lead-out sheet (8) is provided with a rubber block (10), and the first layer of insulating isolation film (7-1) and the second layer of insulating isolation film (7-2) can completely seal the part of the lead-out sheet provided with the rubber block (10).

5. The soft-package lithium ion power battery with the heating film according to claim 1, characterized in that: the first battery cell (3-1) and the second battery cell (3-2) are equal in thickness.

6. The soft-package lithium ion power battery with the heating film according to claim 3, characterized in that: the heating tab (4) is a copper tab or a copper nickel-plated tab, the heating film (6) is sheet-shaped, the heating element (6-1) is S-shaped or U-shaped, and the heating element (6-1) is made of one of nickel, copper and aluminum.

7. The soft-package lithium ion power battery with the heating film according to claim 1, characterized in that: the first layer of insulating isolating film (7-1) and the second layer of insulating isolating film (7-2) are both polypropylene films or modified polypropylene films.

8. The soft-package lithium ion power battery with the heating film according to claim 1, characterized in that: the first layer of insulating isolation film (7-1) is a single-layer film material or a multi-layer structure film material, and the second layer of insulating isolation film (7-2) is a single-layer film material or a multi-layer structure film material. Wherein one side of the multilayer structure film material sealing heating element (6-1) is a high melting point, and the other side of the multilayer structure film material is a low melting point.

9. The soft-package lithium ion power battery with the heating film according to claim 4, characterized in that: the lead-out sheet (8) is used as one of a temperature acquisition and control end and a battery SOC state calibration end; two heating element ends (6-2) are respectively welded with two heating lugs (4).

10. The soft-package lithium ion power battery with the heating film according to claim 1, characterized in that: a diaphragm (9) is arranged between the heating film (6) and the first electric core (3-1), and a diaphragm (9) is arranged between the heating film and the second electric core (3-2).

Technical Field

The invention belongs to the field of soft package lithium ion power batteries, and particularly relates to a soft package lithium ion power battery with a heating film.

Background

With the rapid development of lithium ion batteries and the large-scale application of the lithium ion batteries in the fields of new energy automobiles and energy storage in recent years, the working environment of the batteries is more and more severe, and particularly in cold climate areas, the lithium ion batteries have natural short plates. Particularly, when the battery is charged at low temperature, the lithium embedding capacity of the battery on the surface of a negative electrode material is reduced, even lithium precipitation occurs, irreversible reaction is caused, the capacity is reduced, the service life is shortened, and even short circuit risk occurs; and the discharge efficiency can not be effectively exerted due to the lower chemical activity of the battery during discharge, so that the application of the lithium ion battery is limited, and the battery with the heating function enables the lithium ion battery to be used under any climate and region conditions when the battery is at a proper working temperature.

The current lithium ion batteries with heating functions are divided into two types: one is for the auxiliary heating type of external heat source, as the structure proposed in patent CN108550734A, namely, the heating of the battery system is realized by adding the heating pad in the box, the design form is to transfer the heat to the inside of the battery finally through the layer structure and the battery case, and a part of the heat is dissipated to the air by convection, the heating is not uniform and the efficiency is low; another is to arrange a heating film inside the battery, for example, a structure proposed in patent CN206742424U, in which one electrode is welded to the negative plate of the battery, and the other electrode is led out to the outside of the battery to form a terminal, and this design form of heating electrode is in contact with the electrolyte environment inside the battery, the heating element is corroded after long-term use, or the exposed edge of the heating element punctures the diaphragm, so that there is a risk of short circuit, and at the same time, the manufacturing difficulty is increased (the welding process is difficult when the thickness of the heating film is different from that of.

Disclosure of Invention

In order to solve the technical problems, the invention provides the soft-package lithium ion power battery with the heating film, which has the advantages of uniform heat dissipation to the battery cell, high packaging safety and difficult short circuit and is arranged in the battery cell.

The technical scheme of the invention is as follows:

a soft packet of lithium ion power battery of area heating membrane includes: the battery cell comprises a battery cell main body (3), a heating film (6), a positive electrode lug (1), a negative electrode lug (2) and an aluminum plastic film shell (5), wherein the battery cell main body (3) consists of a first battery cell (3-1) and a second battery cell (3-2), the positive electrode lug (1) and the negative electrode lug (2) are arranged on the battery cell main body (3), the heating film (6) is arranged on the first battery cell (3-1), in the middle of the second electric core (3-2), the electric core main body (3) and the heating film (6) are sealed inside by the aluminum plastic film shell (5), the heating film (6) consists of a heating body (6-1), a first layer of insulating isolation film (7-1) and a second layer of insulating isolation film (7-2), and the heating body (6-1) can be sealed by the first layer of insulating isolation film (7-1) and the second layer of insulating isolation film (7-2); the heating body (6-1) consists of a heating body main body (6-3) and two heating body ends (6-2), the heating body main body (6-3) and the two heating body ends (6-2) are integrally formed, the two ends of the heating body main body (6-3) are respectively provided with the extended heating body ends (6-2), and the heating film (6) and the aluminum plastic film shell (5) are integrally packaged through a first insulating isolating film (7-1) and a second insulating isolating film (7-2) at the position of the heating body ends (6-2). The inner layer of the aluminum-plastic film shell is a polypropylene film or a modified polypropylene film.

Furthermore, each heating element end (6-2) is provided with a rubber block (10), and the first layer of insulating isolation film (7-1) and the second layer of insulating isolation film (7-2) can completely seal the heating element main body (6-3) and the part of the heating element end provided with the rubber block (10).

Furthermore, two heating tabs (4) are respectively connected with two heating element ends (6-2), each heating tab (4) is provided with a rubber block (10), and the first layer of insulating isolation film (7-1) and the second layer of insulating isolation film (7-2) can completely seal the heating elements (6-1) and the parts of the heating tabs provided with the rubber blocks (10).

Furthermore, a rubber block (10) is arranged on the lead-out sheet (8), and the part of the lead-out sheet provided with the rubber block (10) can be completely sealed by the first layer of insulating isolation film (7-1) and the second layer of insulating isolation film (7-2).

Further, the first cell (3-1) and the second cell (3-2) are equal in thickness.

Furthermore, the heating tab (4) is a copper tab or a copper nickel-plated tab, the heating film (6) is sheet-shaped, the heating element (6-1) is S-shaped or U-shaped, and the heating element (6-1) is made of one of nickel, copper and aluminum.

Furthermore, the first layer of insulating isolation film (7-1) and the second layer of insulating isolation film (7-2) are both polypropylene films or modified polypropylene films.

Furthermore, the first layer of insulating isolation film (7-1) is a single-layer film material or a multi-layer structure film material, and the second layer of insulating isolation film (7-2) is a single-layer film material or a multi-layer structure film material. Wherein one side of the multilayer structure film material sealing heating element (6-1) is a high melting point, and the other side of the multilayer structure film material is a low melting point.

Further, the lead-out sheet (8) is used as one of a temperature acquisition and control end and a battery SOC state calibration end; two heating element ends (6-2) are respectively welded with two heating lugs (4).

Furthermore, a diaphragm (9) is arranged between the heating film (6) and the first electric core (3-1), and a diaphragm (9) is arranged between the heating film and the second electric core (3-2).

Furthermore, the extension directions of the positive electrode tab (1) and the negative electrode tab (2) are the same, the extension directions of the two heating electrode tabs (4) are the same, and the heating electrode tabs (4) are 90 degrees or 180 degrees with the positive electrode tab (1) and the negative electrode tab (2).

The invention has the beneficial effects that:

1. the heating body is sealed by the insulating isolation film and is not contacted with the electrolyte, so the heating body cannot be corroded by the electrolyte.

2. The terminal of the heating body sealed by the tab rubber block cannot be exposed to the outside to pierce the inner layer of the aluminum-plastic film, so that poor insulation of the battery is caused, and the safety is improved.

3. The invention can heat the battery core more uniformly and has higher efficiency.

4. After the end of the heating body is welded with the heating pole lug, the first layer of insulating isolation film and the second layer of insulating isolation film are used for sealing the pole lug glue block, so that the isolation of electrolyte and the heating body and the encapsulation of an inner layer of an aluminum plastic film shell are ensured. The invention is easy to manufacture.

Drawings

Fig. 1 is an exploded view of a lithium ion power battery according to the present invention;

FIG. 2 is a schematic view showing a structure in which a heating film is sealed according to example 1;

FIG. 3 is a schematic view showing a structure in which a heating film is sealed according to example 2;

FIG. 4 is a schematic view showing a structure in which a heating film is sealed according to example 3;

FIG. 5 is a schematic structural view of embodiment 3 encapsulated by a housing;

FIG. 6 is a schematic structural view of embodiment 4 encapsulated by a housing;

wherein, 1: positive tab, 2: negative electrode tab, 3: cell main body, 3-1: first battery cell, 3-2: a second cell, 4: heating a tab, 5: plastic-aluminum film casing, 6: heating film, 6-1: heating element, 6-2: heating element end, 6-3: heating element main body, 7-1: first insulating isolation film, 7-2: second-layer insulating separator, 8: tab, 9: diaphragm, 10: and (5) gluing blocks.

Detailed Description

The invention is further described in conjunction with the description of figures 1-6.