CN217823004U

CN217823004U - Power lithium battery cell structure

Info

Publication number: CN217823004U
Application number: CN202221586712.2U
Authority: CN
Inventors: 汤勇; 赵威; 张仕伟; 刘杭; 余小媚; 黄梓滨
Original assignee: Guangdong Changnengda Technology Development Co ltd
Current assignee: Guangdong Changnengda Technology Development Co ltd
Priority date: 2022-06-19
Filing date: 2022-06-19
Publication date: 2022-11-15
Anticipated expiration: 2032-06-19

Abstract

The utility model discloses a power lithium cell electricity core structure relates to power battery technical field, and this power lithium cell electricity core structure includes: positive plate, negative pole piece, diaphragm and soaking plate lamination, the reciprocal range upon range of setting of diaphragm, adjacent two-layerly be provided with between the diaphragm the positive plate the negative pole piece or one of them of soaking plate lamination, wherein, the positive plate with the negative pole piece sets up in turn, the soaking plate lamination has a slice at least, the soaking plate lamination is the soaking plate structure. Superpose the soaking board lamination to between the positive plate or the negative pole piece of electric core structure, from the inside battery soaking that realizes of electric core, be favorable to improving the heat conductivility of electric core structure itself, derive the heat of battery to electric core structure outside, compare in traditional outside radiating mode, the utility model discloses a heat dissipation scheme more can fundamentally solve the problem that the inside temperature of battery is concentrated.

Description

Power lithium battery cell structure

Technical Field

The utility model relates to a power battery technical field especially relates to a power lithium cell electricity core structure.

Background

With the rise of new energy automobiles in recent years, various new energy concepts including automobiles begin to be popularized and popularized, but problems such as spontaneous combustion, ignition and the like of the new energy automobiles are accompanied. Compared with a traditional oil vehicle, the potential threat of the power battery under some complex working conditions is very large, and when the battery is exposed to extreme conditions such as overcharge, overdischarge, short circuit, needling, extrusion and the like, thermal runaway of the battery is very easy to induce. For example, when the battery is overcharged, the heating power of the battery is increased by a square multiple, and if the heat of the battery cannot be discharged in time due to heat dissipation of the battery, especially when the external temperature of the heat inside the battery cannot be reduced in time, heat concentration is more likely to occur. With the wider application of batteries, similar safety problems have become the key core of the development of related industries, and more directly affect the future of the new energy automobile industry field.

However, heat dissipation means such as water cooling and air cooling have been developed by related researchers in a large amount in terms of how to dissipate heat of the battery, and have been applied to various industries according to actual heat dissipation requirements. However, due to the low thermal conductivity of the battery material itself, it is difficult to discharge the heat in the battery in a timely manner. Since the thermal conductivity of the cell itself is insufficient, particularly in the stacked cell, the thermal conductivity in the stacking direction is extremely low, and the thermal conductivity in the direction of the plane of the heat spreader plate stack is also extremely limited. Therefore, the phase change heat transfer outside the battery is not ideal for cooling the inside of the battery, and experimental data show that the external phase change heat transfer can only meet the discharge heat dissipation requirement of the battery 3C, so how to better realize the heat conduction inside the battery, and the heat conduction is an extremely important topic and direction for heat dissipation of the battery.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a power lithium cell electricity core structure can effectively in time discharge the inside heat of electricity core structure to effectively avoid the inside condition that the temperature concentrates that appears of battery.

According to the utility model discloses a power lithium cell electricity core structure of aspect embodiment, include: positive plate, negative pole piece, diaphragm and soaking plate lamination, the reciprocal range upon range of setting of diaphragm, adjacent two-layerly be provided with between the diaphragm the positive plate the negative pole piece or one of them of soaking plate lamination, wherein, the positive plate with the negative pole piece sets up in turn, the soaking plate lamination has a slice at least, the soaking plate lamination is the soaking plate structure.

According to an aspect of the present invention, the soaking plate lamination is provided with two pieces at least, two adjacent pieces at least between the soaking plate lamination is provided with one positive plate and one negative plate.

According to an aspect of the present invention, the heat spreader lamination is made of metal, and the heat spreader lamination surface is provided with an insulating film.

According to an aspect of the present invention, the heat spreader plate laminate to which the insulating film is attached is closely attached to the diaphragm.

According to an embodiment of an aspect of the present invention, the heat spreader lamination is a polymer material flexible heat spreader lamination.

According to an embodiment of an aspect of the present invention, the thickness of the heat spreader lamination is 0.1 mm-2 mm, and the thermal conductivity of the heat spreader lamination is greater than or equal to 1500 w/(K · m).

According to an aspect of the present invention, along the thickness direction of the heat spreader lamination, the heat spreader lamination has a structure obtained by adding capillary fibers and chemical etching process treatment.

The utility model discloses power lithium cell electricity core structure of on the other hand embodiment, including two at least electric core units and soaking plate lamination, the soaking plate lamination sets up in adjacent two between the electric core unit, the soaking plate lamination is the soaking plate structure.

According to the utility model discloses an embodiment of another aspect, electric core unit is coiling type battery electricity core structure.

According to the utility model discloses an embodiment of another aspect, electric core unit is soft-packaged battery electricity core structure.

According to the utility model discloses a power lithium cell electricity core structure of aspect embodiment has following beneficial effect at least: in the embodiment of the utility model, the laminated soaking plate is superposed on the positive plate or the negative plate of the electric core structure, so that the internal part of the electric core structure realizes the soaking of the battery, which is beneficial to improving the heat-conducting property of the electric core structure, thereby leading out the heat of the battery; the laminated soaking plate is of a soaking plate structure, the laminated soaking plate is arranged into an ultrathin soaking plate, the increase ratio of the size and the weight can be reduced to the maximum extent, and the heat-conducting property of the battery is greatly improved on the premise of hardly influencing the actual use of the battery.

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 invention will be further described with reference to the following drawings and examples, in which:

fig. 1 is a schematic structural diagram of a cell structure of a stacked power lithium battery according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a cell structure of a power lithium battery according to another embodiment of the present invention;

fig. 3 is a schematic structural diagram of a cell structure of a power lithium battery according to one embodiment of another aspect of the present invention.

Reference numerals:

1. a positive plate; 2. a negative plate; 3. a diaphragm; 4. an electrolyte; 5. laminating the soaking plates; 6. an insulating film; 10. a cell unit; 20. a housing.

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 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 drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, 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, a plurality of means is one or more, a plurality of means is two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If there is a description of first and second for the purpose of distinguishing technical features only, this is not to be understood as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like 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 present 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.

Since the thermal conductivity of the cell itself is insufficient, particularly in the stacked cell, the thermal conductivity in the stacking direction is extremely low, and the thermal conductivity in the direction of the plane of the heat spreader plate stack is also extremely limited. Therefore, the temperature inside the battery is not ideally lowered by the phase change heat transfer from the outside of the battery. Experimental data show that external phase change heat transfer can only meet the discharge heat dissipation requirements of the battery 3C, and how to better realize heat conduction in the battery becomes an extremely important topic and direction for heat dissipation of the battery.

In terms of how to dissipate heat of the battery, heat dissipation means such as water cooling, air cooling and the like have been developed by related researchers in large quantities, and are applied to various industries according to actual heat dissipation requirements. However, due to the low thermal conductivity of the battery material itself, it is difficult to discharge the heat in the battery in a timely manner. Therefore, how to improve the thermal conductivity of the cell structure itself becomes an extremely important prospect. And the appearance of the ultrathin soaking plate provides a good idea for the direction: the ultra-thin soaking plate is applied to the field of battery heat dissipation so as to greatly improve the heat conductivity of battery heat dissipation.

Referring to fig. 1, an embodiment of the utility model discloses a power lithium battery cell structure, this power lithium battery cell structure includes positive plate 1, negative pole piece 2, diaphragm 3 and vapor chamber lamination 5.

The diaphragm 3 is arranged in a reciprocating and laminating mode, one of the positive plate 1, the negative plate 2 or the soaking plate lamination 5 is arranged between every two adjacent layers of diaphragms 3, the positive plate 1 and the negative plate 2 are alternately arranged, the soaking plate lamination 5 is at least provided with one piece, and the soaking plate lamination 5 is of a soaking plate structure. The lamination method is mainly directed to a cell structure formed by laminating a laminated battery. Specifically, in the reciprocating stacking process of the diaphragm 3, a positive plate 1 or a negative plate 2 is placed into the diaphragm 3 every time the diaphragm 3 is stacked, the positive plate 1 and the negative plate 2 are alternately stacked, and the soaking plate stack 5 is stacked into the electric core structure according to actual heat dissipation requirements so as to meet heat dissipation requirements.

The embodiment of the utility model provides an in, in superposing soaking plate lamination 5 to positive plate 1 or negative pole piece 2, utilize soaking plate lamination 5 to make the inside soaking that realizes of electric core structure, be favorable to improving the heat conductivility of electric core structure itself to derive the heat of battery. Compare in traditional outside radiating mode, the utility model discloses in with soaking plate lamination 5 stack the inside heat dissipation scheme of electric core structure more can fundamentally solve the problem that the inside temperature of battery concentrates. The utility model discloses in, vapor chamber lamination 5 is the vapor chamber structure, selects this vapor chamber lamination 5 to be ultra-thin vapor chamber, can the bigger degree reduce volume and weight increase than, under the in-service use prerequisite that does not influence the battery hardly, increases substantially the battery thermal conductivity.

In some embodiments, at least two soaking plate stacks 5 are provided, and at least one positive plate 1 and one negative plate 2 are provided between two adjacent soaking plate stacks 5. Specifically, the number and the distribution mode of the soaking plate laminations 5 are set according to the actual heat dissipation requirement of the cell structure, and after the soaking plate laminations 5 are inserted each time, the next soaking plate laminations 5 can be inserted only after a positive plate 1 and a negative plate 2 are overlapped.

In some embodiments, the heat spreader lamination 5 is made of metal, and the surface of the heat spreader lamination 5 is provided with the insulating film 6. For the soaking plate lamination 5 made of metal, an insulating film 6 is required to be attached to the outer surface of the soaking plate lamination 5 for protection, so as to ensure the insulation of the surface of the soaking plate lamination 5 and prevent the corrosion or short circuit of the electrolyte 4. Further, the soaking plate laminate 5 to which the insulating film 6 is attached is closely attached to the diaphragm 3 to reduce contact thermal resistance.

In some embodiments, the heat spreader stack 5 is a flexible heat spreader stack of polymeric material. Aiming at the high polymer material flexible soaking plate lamination, the surface of the soaking plate lamination 5 can be directly superposed into the electric core structure without attaching the insulating film 6.

In some embodiments, the thickness of the stack of vapor chambers 5 is 0.1mm to 2mm, and the thermal conductivity of the stack of vapor chambers 5 is greater than or equal to 1500 w/(K · m). In this embodiment, the thickness of the soaking plate lamination 5 may be selected to be 0.1mm, 1.5mm, or 2mm according to the cell structure and the heat dissipation requirement. It should be understood that when the thickness of the heat spreader lamination 5 is less than or equal to 2mm, it is the ultra-thin heat spreader lamination described in the embodiments of the present invention. Inserting an ultrathin soaking plate lamination 5 into the cell structure to realize the soaking of the cell from the inside of the cell structure; meanwhile, the heat conductivity of the soaking plate lamination 5 is selected to be more than or equal to 1500 w/(K.m), so that the heat conducting performance of the battery is improved, and the heat of the battery is taken out to prevent the problem of temperature concentration in the battery.

In the present embodiment, the heat spreader lamination 5 has a structure obtained by adding capillary fibers and chemical etching process treatment in the thickness direction of the heat spreader lamination 5. In the conventional stacked cell, the thermal conductivity along the stacking direction is extremely low, and the thermal conductivity in the direction of the surface of the soaking plate stack 5 is also extremely limited, so that the temperature reduction inside the cell by the phase change heat transfer from the outside of the cell is not ideal. In this embodiment, the ultra-thin vapor chamber lamination 5 is subjected to the capillary fiber increasing and etching process along the thickness direction of the ultra-thin vapor chamber lamination, so that the liquid absorbing core has the super-hydrophilic characteristic to enhance the phase change heat transfer performance in the thickness direction of the ultra-thin vapor chamber lamination, thereby improving the heat conductivity in the thickness direction of the ultra-thin vapor chamber lamination.

A power lithium battery cell structure according to an embodiment of an aspect of the present invention is described in detail with reference to fig. 1 as a specific embodiment. It should be understood that the following embodiments are only exemplary descriptions and should not be construed as limiting the structure of the power battery cell according to the embodiments of the present invention.

As shown in fig. 1, the present embodiment provides a power lithium battery cell structure embedded in a soaking plate lamination 5, and the power lithium battery cell structure includes a positive plate 1, a negative plate 2, a diaphragm 3, an electrolyte 4, a soaking plate lamination 5, and an insulating film 6, where the soaking plate lamination 5 is an ultra-thin VC soaking plate.

The power lithium battery cell structure is formed by lamination. In the reciprocating lamination process of the diaphragm 3, when the diaphragm 3 is laminated one layer at a time, a positive plate 1 or a negative plate 2 is placed, and the positive plate 1 and the negative plate 2 are alternately laminated. After five times of alternate superposition, superposing the ultrathin VC soaking plate laminations into the laminated structure or inserting the laminated laminations into the cell structure; and an insulating film 6 is attached to the surface of the ultrathin soaking plate lamination to ensure the insulativity of the surface of the ultrathin soaking plate lamination 5, so that the ultrathin soaking plate lamination is prevented from being corroded by the electrolyte 4 and short circuit is prevented.

In this embodiment, the used battery case material is copper, and the ultra-thin vapor chamber lamination is a capillary enhanced vapor chamber. According to the actual requirement of the cell structure, after 5 groups of positive plates 1 and negative plates 2 are inserted, an ultrathin soaking plate lamination 5 is inserted, namely the capillary enhanced soaking plate. Wherein the thickness of the ultrathin soaking plate lamination is 0.4mm, the thermal conductivity is 12000 w/(K.m), and the outer surface of the ultrathin soaking plate lamination is attached with the insulating film 6. Wherein, the ultra-thin VC soaking plate lamination 5 attached with the insulating film 6 is tightly attached with the electrode slice or the diaphragm 3 to reduce the contact thermal resistance. It should be understood that each set of the positive electrode tab 1 and the negative electrode tab 2 includes one positive electrode tab 1 and one negative electrode tab 2.

The embodiment of the utility model provides an on the other hand discloses another kind of power lithium cell electricity core structure, this power lithium cell electricity core structure includes two at least electric core units 10 and vapor chamber lamination 5, and vapor chamber lamination 5 sets up between two adjacent electric core units 10, and vapor chamber lamination 5 is the vapor chamber structure. Superpose between two adjacent electric core units 10 soaking board lamination 5, utilize soaking board lamination 5 in order to realize the battery soaking, be favorable to improving the thermal conductivity of electric core structure itself to derive the heat of battery to electric core structure outside, in order to solve the problem that the inside temperature of battery is concentrated. Soaking plate lamination 5 is soaking plate structure, sets up this soaking plate lamination 5 into ultra-thin soaking plate, can reduce the increase ratio of volume and weight by the at utmost, under the in-service use prerequisite that hardly influences the battery, increases substantially battery thermal conductivity.

In some embodiments, the cell unit 10 is a wound battery cell structure.

As one example, as shown in fig. 2, in this embodiment, for a winding battery cell structure, an ultra-thin VC soaking plate lamination is inserted between different winding packages, and the adopted ultra-thin VC soaking plate lamination is a flexible soaking plate made of a polymer material. The polymer material has an insulating property, so that the polymer material can be in direct contact with the electrolyte solution 4 or the electrode material without applying the insulating film 6 to the outside of the soaking plate, and has a thickness of 0.6mm and a thermal conductivity of 2000 w/(K · m).

In some embodiments, the cell unit 10 is a pouch battery cell structure.

As an example, as shown in fig. 3, in this embodiment, for a multi-group soft package type battery cell structure, an aluminum-based soaking plate is adopted for the soaking plate lamination 5, and the aluminum-based soaking plate is tightly connected with the battery case 20 by laser welding, so that heat inside the battery is directly conducted to the battery metal case 20 and then dissipated into a water cooling plate or air.

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 without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.

Claims

1. A power lithium battery cell structure, comprising: positive plate, negative pole piece, diaphragm and soaking plate lamination, the reciprocal range upon range of setting of diaphragm, adjacent two-layerly be provided with between the diaphragm the positive plate the negative pole piece or one of them of soaking plate lamination, wherein, the positive plate with the negative pole piece sets up in turn, the soaking plate lamination has a slice at least, the soaking plate lamination is the soaking plate structure.

2. The dynamic lithium battery cell structure of claim 1, wherein at least two soaking plate laminations are arranged, and at least one positive plate and one negative plate are arranged between two adjacent soaking plate laminations.

3. The power lithium battery cell structure of claim 1 or 2, wherein the heat spreader lamination is made of metal, and an insulating film is disposed on the surface of the heat spreader lamination.

4. The power lithium battery cell structure of claim 3, wherein the heat spreader lamination with the insulating film attached thereto is in intimate contact with the separator.

5. The dynamic lithium battery cell structure of claim 1 or 2, wherein the laminate of vapor chambers is a laminate of flexible vapor chambers of polymeric material.

6. The dynamic lithium battery cell structure of claim 1, wherein the thickness of the laminate of the soaking plates is 0.1mm to 2mm, and the thermal conductivity of the laminate of the soaking plates is greater than or equal to 1500 w/(K-m).

7. The power lithium battery cell structure of claim 1 or 6, wherein the heat spreader stack has a structure treated by adding capillary fibers and a chemical etching process along the thickness direction of the heat spreader stack.

8. The utility model provides a power lithium cell electricity core structure which characterized in that, includes two at least electric core units and soaking plate lamination, the soaking plate lamination sets up in adjacent two between the electric core unit, the soaking plate lamination is soaking plate structure.

9. The power lithium battery cell structure of claim 8, wherein the cell unit is a wound battery cell structure.

10. The power lithium battery cell structure of claim 8, wherein the cell unit is a pouch battery cell structure.