CN218957853U - High-capacity battery - Google Patents

Abstract

The utility model provides a high-capacity battery, which mainly solves the problems that the heat at the lug of the existing high-capacity soft-package battery is not easy to dissipate, the battery performance is affected and the thermal runaway is easy to cause. The high-capacity battery comprises a first cover plate, a second cover plate, a box body, a plurality of soft package batteries and a plurality of heat conducting pieces; the first cover plate and the second cover plate are arranged at the open ends of the two sides of the box body in a sealing way and are enclosed with the box body to form a battery shell, and the first cover plate and the second cover plate are respectively the anode and the cathode of the high-capacity battery; a plurality of soft package batteries are arranged in the battery shell, and heat conducting pieces are arranged in gaps between positive lugs of each soft package battery and the box body and between negative lugs of each soft package battery and the box body. According to the utility model, the heat conducting piece is arranged at the lug of the soft-package battery, and transfers the heat collected at the lug of the soft-package battery to the side wall of the box body, so that the influence of heat collection in the battery shell on the performance of the high-capacity battery is avoided, and meanwhile, the occurrence of thermal runaway is also avoided.

Description

High-capacity battery

Technical Field

The utility model belongs to the field of batteries, and particularly relates to a high-capacity battery.

Background

The application field of lithium ion batteries is very wide, and with the further development of lithium ion batteries in recent years, a plurality of lithium ion batteries are assembled into a large-capacity battery in series-parallel connection, so that the large-capacity battery is applied to the fields of energy storage, power batteries and the like.

Chinese patent CN114566771a discloses a high-capacity battery, which comprises a casing, a battery cell group disposed in the casing, and cover plates disposed on two opposite sides of the casing, wherein the cover plates are the positive and negative electrodes of the battery. The battery cell group is formed by connecting a plurality of battery cells which are grouped according to capacity, voltage, internal resistance, self-discharge and the like and have similar performances in parallel. The battery cell group tab is connected with a cover plate, and the cover plate is in insulation and sealing connection with the shell. The cover plate is used as the pole of the high-capacity battery, so that the material can be saved, the energy density of the battery can be increased, the heat dissipation effect of the battery can be improved, the conductive area between two high-capacity batteries can be increased when the two high-capacity batteries are connected in series, and the energy density and the safety of the battery can be improved.

Because of the principle and structural characteristics of lithium ion batteries, large heat is often generated due to internal resistance heating in the repeated use process. Above-mentioned high-capacity battery's electric core setting is in confined casing, and the heat that its during operation produced can constantly gather, and especially the heat of electric core utmost point ear department, and the heat that the region produced that every electric core is close to the utmost point ear more is higher during charge and discharge, and the heat of this department constantly gathers, can't dispel, has not only influenced high-capacity battery's performance, still easily has the risk that takes place thermal runaway, and then causes the potential safety hazard.

Disclosure of Invention

The utility model provides a high-capacity battery, which aims to solve the problems that heat at the lug of the conventional high-capacity soft-package battery is not easy to dissipate, the battery performance is affected and thermal runaway is easy to cause.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

the high-capacity battery provided by the utility model comprises a first cover plate, a second cover plate, a box body and a plurality of soft package batteries; the first cover plate and the second cover plate are arranged at the open ends of the two sides of the box body in a sealing way and are enclosed with the box body to form a battery shell; the plurality of soft package batteries are arranged in the battery shell, positive lugs of the plurality of soft package batteries are electrically connected with the first cover plate, and negative lugs of the plurality of soft package batteries are electrically connected with the second cover plate, so that the first cover plate and the second cover plate are respectively the positive electrode and the negative electrode of the high-capacity battery; and heat conducting pieces are arranged in gaps between the positive electrode lug and the box body of each soft package battery and between the negative electrode lug and the box body of each soft package battery, and the heat conducting pieces transfer heat on the positive electrode lug or the negative electrode lug of the soft package battery to the box body to be dissipated. According to the utility model, the heat conducting piece is arranged at the lug of the soft-package battery, and transfers the heat collected at the lug of the soft-package battery to the side wall of the box body, so that the influence of heat collection in the battery shell on the performance of the high-capacity battery is avoided, and meanwhile, the occurrence of thermal runaway is also avoided.

The first cover plate and the second cover plate are electric conductors and are generally made of conductive metal. For the box body, the material of the box body is not limited, if the box body is made of a non-conductive material, the heat conducting piece can extrude the positive electrode lug or the negative electrode lug of the soft package battery to be in direct contact with the box body, and heat only needs to be transferred through the heat conducting piece, so that the heat conducting effect is good.

In order to improve the rigidity of the battery case while maintaining the heat conduction effect, the case is generally made of a metal material, such as an aluminum alloy or the like. At this time, an insulating layer is arranged between the tab of the soft package battery and the inner wall of the box body, so that the short circuit caused by the electric conduction between the positive tab and the negative tab of the soft package battery and the box body can be avoided. The heat conducting piece extrudes the positive lug or the negative lug of the soft package battery to enable the insulating layer to be in direct contact with the box body. The insulating layer is a PP insulating film or a PE insulating film, and the thickness is 0.2 mm-1 mm. The insulating layer with the thickness and the material can ensure the insulating effect and also can consider the heat conducting performance.

In order to conduct out the heat of utmost point ear department as far as, bend the utmost point ear of soft packet of battery and form kink, this kink is located between insulating layer and the heat conduction spare, and this kink has increased the heat conduction area, in time high-efficient transfer with the heat of utmost point ear department gathering. In order to further improve the heat transfer effect, the heat conducting piece is tightly contacted with the case body and the lugs of the soft-packaged battery as much as possible, so that the shape of the heat conducting piece is matched with the shape of the gap between the bent part lugs and the lug extending end surfaces. Preferably, the heat conducting piece is of a columnar structure, the cross section of the columnar structure is circular or wedge-shaped, and the shape can be matched with the shape of the lugs of the existing soft-package battery after being bent, so that the heat conducting piece is in close contact with the lugs of the soft-package battery, and the heat conducting effect is improved.

Further, the side wall of the box body is provided with a liquid cooling device or a heat radiating device, the liquid cooling device can be a liquid cooling plate or a liquid cooling pipe arranged on the side wall of the box body, the heat radiating device can be a heat radiating fin arranged on the side wall of the box body, and the liquid cooling device and the heat radiating device can treat heat transferred by the heat conducting piece timely and effectively, so that the battery works at the optimal temperature.

Furthermore, heat-conducting glue can be filled between the box body and the soft package battery, and heat generated at different positions of the soft package battery is transferred to the side wall of the box body through the heat-conducting glue.

Further, in order to facilitate the installation of the soft package batteries, the positive electrode lugs and the negative electrode lugs of the soft package batteries are positioned on the same side of the box body, and at the moment, heat of the positive electrode lugs and the negative electrode lugs can be transferred through the same insulating heat conducting piece. The heat conducting piece is preferably a heat conducting ceramic rod or an insulating heat pipe, the heat conducting ceramic rod not only has excellent heat conducting effect, but also has insulating property, so that the electric connection safety of the electrode lugs is good, and compared with other heat conducting pieces, the insulating heat pipe has very excellent heat conducting capacity and can conduct heat transfer timely and efficiently.

Further, the positive lugs of the plurality of soft package batteries are electrically connected with the first cover plate through one group of conductive connecting sheets, and the negative lugs are electrically connected with the second cover plate through the other group of conductive connecting sheets.

Compared with the prior art, the technical scheme of the utility model has the following advantages:

according to the high-capacity battery, the heat conducting piece is arranged at the lug of the soft-packaged battery, and transfers heat of the soft-packaged battery, particularly heat collected at the lug, to the side wall of the box body, so that the influence of heat collection in the battery shell on the performance of the high-capacity battery is avoided, and the risk of thermal runaway of the high-capacity battery is reduced.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model.

Drawings

Fig. 1 is a schematic diagram of a high-capacity battery in embodiment 1 of the present utility model;

fig. 2 is a schematic diagram of a high-capacity battery in embodiment 1 of the present utility model;

FIG. 3 is a schematic view showing the installation of an insulating layer in embodiment 1 of the present utility model;

fig. 4 is a schematic diagram illustrating the installation of the heat conducting member and the soft pack battery in embodiment 1 of the present utility model;

fig. 5 is a second schematic installation diagram of the heat conducting member and the soft package battery in embodiment 1 of the present utility model;

fig. 6 is a schematic structural view of a large-capacity battery in embodiment 2 of the present utility model.

Reference numerals: the solar battery comprises a 1-box body, a 2-heat conducting piece, a 3-soft package battery, a 4-insulating layer, a 5-first cover plate, a 6-second cover plate, a 7-liquid cooling device, an 8-heat radiating device, a 9-conductive connecting piece, 31-lugs, 32-positive lugs, 33-negative lugs, 311-bending parts and 312-lugs, wherein the lugs extend out of the end face.

Detailed Description

The utility model will be described in detail below with reference to the drawings and the detailed description. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present utility model, and are not intended to limit the scope of the present utility model.

Example 1

As shown in fig. 1 to 5, the present embodiment provides a high-capacity battery including a battery case and a plurality of soft pack batteries 3 located in the battery case, the battery case is mainly formed by enclosing a first cover plate 5, a second cover plate 6 and a case 1, the case 1 is a rectangular case with two open ends, and the first cover plate 5 and the second cover plate 6 are hermetically disposed at the open ends of the two sides of the case 1. The plurality of soft package batteries 3 are arranged in the battery shell, the positive lugs 32 of the plurality of soft package batteries 3 are electrically connected with the first cover plate 5 through the conductive connecting sheet 9, the negative lugs 33 of the plurality of soft package batteries 3 are electrically connected with the second cover plate 6 through the conductive connecting sheet 9, so that the first cover plate 5 is the positive electrode of the high-capacity battery, and the second cover plate 6 is the negative electrode of the high-capacity battery.

After the soft-pack battery 3 is installed in the battery housing, the heat generated in the charging and discharging process of the soft-pack battery 3 cannot be timely dissipated because the whole battery housing is a closed cavity, and particularly, the electric connection part of the tab 31 and the conductive connecting sheet 9. At this time, in order to rapidly remove the heat generated from the pouch cell 3, the heat conductive member 2 is added to the tab 31 of the pouch cell, and the heat generated from the tab 31 of the pouch cell is timely transferred to the case via the heat conductive member 2. In the present embodiment, the heat conductive member 2 can achieve heat transfer by several means:

in the first mode, the existing soft-pack battery 3 is vertically placed in the box body 1, in order to facilitate the electric connection between the soft-pack battery 3 and the first cover plate 5 and the second cover plate 6, the positive electrode lug 32 and the negative electrode lug 33 of the soft-pack battery 3 are positioned on the upper side and the lower side of the soft-pack battery 3, at this time, the positive electrode lug 32 of the soft-pack battery 3 is positioned at the open end of one side of the box body 1, the negative electrode lug 33 is positioned at the open end of the other side of the box body 1, the positive electrode lug 32 and the negative electrode lug 33 are respectively provided with a horizontally placed heat conducting piece 2, two ends of the heat conducting piece 2 are contacted with the inner wall of the box body 1, and heat at the positive electrode lug 32 and the negative electrode lug 33 is transferred to the box body 1;

the second mode only can realize heat transfer between the two end parts of the heat conducting piece 2 and the side wall of the box body 1 because of the first mode, and the heat conducting effect of the heat conducting mode is relatively weak. Therefore, the soft-packed battery 3 can be horizontally placed in the box body 1, the positive electrode lug 32 and the negative electrode lug 33 of the soft-packed battery 3 are close to or contact with the side wall of the box body 1, the vertical heat conducting piece 2 is inserted into the positive electrode lug 32 and the negative electrode lug 33, at the moment, the electrode lug 31 of the soft-packed battery 3 and the heat conducting piece 2 are tightly contacted with the box body 1, the heat conducting piece 2 transfers the heat at the electrode lug 31 to the side wall of the box body 1, the heat conducting piece 2 in the mode realizes heat transfer through most of the side walls except the end part, the heat transfer area is larger, the heat transfer effect is better, and the box body in the mode is an insulating box body;

since the positive electrode tab 32 and the negative electrode tab 33 of most of the conventional pouch cells 3 are located on the same side of the pouch cells 3, heat of the positive electrode tab 32 and the negative electrode tab 33 of the same pouch cell 3 can be transferred through the same heat conductive member 2 or different heat conductive members 2. If different heat conducting members 2 are used to transfer heat to the positive electrode tab 32 and the negative electrode tab 33 of the same soft pack battery 3, the heat conducting members 2 may not have an insulating function. If the heat of the positive electrode tab 32 and the negative electrode tab 33 is conducted through the same heat conducting member 2, the heat conducting member 2 further has an insulating function, at this time, the heat conducting member 2 may be a heat conducting ceramic or a heat pipe with an insulating jacket, and the specific material of the heat conducting ceramic is one of beryllium oxide, aluminum nitride, silicon carbide, silicon nitride, aluminum oxide and polycrystalline diamond (PCD) ceramic. The heat conducting piece 2 made of the material can rapidly conduct out the heat of the soft package battery 3 under the condition of ensuring insulation, so that the heat conducting piece has the characteristics of good heat conducting effect and low cost;

in the third mode, the first cover plate 5 and the second cover plate 6 are generally made of aluminum alloy with good heat conduction and heat dissipation, the material of the box body 1 can be made of insulating material or conductive material, in order to improve the heat dissipation performance as much as possible, the box body 1 is made of aluminum alloy with good heat conduction and heat dissipation, and the aluminum alloy can quickly transfer the heat of the heat generating point to other parts and efficiently dissipate the heat through air convection and shell heat radiation and conduction. Because the aluminum alloy case 1 is an electrical conductor, at this time, an insulating layer 4 is disposed between the tab 31 of the soft pack battery 3 and the inner wall of the case 1, and the insulating layer 4 can avoid short circuit caused by electrical conduction between the positive tab 32 and the negative tab 33 of the soft pack battery 3 and the case 1. The heat conducting member 2 is inserted into the gap between the insulating layer 4 and the tab 31 of the soft pack battery 3, and the heat conducting member 2 presses the positive tab 32 or the negative tab 33 of the soft pack battery 3 to enable the insulating layer 4 to be in direct contact with the case 1, so that heat at the tab 31 transfers heat to the case 1 through the heat conducting member 2 and the insulating layer 4. In this embodiment, the insulating layer 4 may be a PP insulating film with a thickness of 0.2mm or a PE insulating film with a thickness of 0.8mm, and the PP insulating film and the PE insulating film may have a very thin thickness, which may not only perform an insulating function, but also may have thermal conductivity.

As shown in fig. 4 and 5, in order to conduct out the heat at the tab 31 as much as possible, the tab 31 of the soft battery 3 is bent to form a bending portion 311, the bending portion 311 is located between the insulating layer 4 and the heat conducting member 2, at this time, two side surfaces of the insulating layer 4 are respectively adhered to the bending portion 311 and the inner wall of the case 1, and the heat conducting member 2 is disposed in a gap between the tab extending end surface 312 and the bending portion 311. This kink 311 has increased the heat conduction area, is favorable to with the heat quick conduction that soft packet of battery 3 produced to box 1 inner wall, and then dispels the heat to outside through box 1 inner wall, has improved the security of battery, simultaneously, heat conduction piece 2 makes through extrusion kink 311 with box 1 in close contact with, has further improved the heat transfer effect.

In order to further enhance the heat transfer effect, the heat conducting member 2 is closely contacted with the case 1 and the tab 31 of the soft battery 3 as much as possible, and the shape of the heat conducting member 2 is matched with the shape of the gap between the tab protruding end surface 312 and the bent portion 311. Preferably, the heat conducting member 2 is in a columnar structure, the cross section of the columnar structure is circular or wedge-shaped, and the shape can be matched with the shape of the tab 31 of the existing soft-packaged battery 3 after being bent, so that the heat conducting member 2 is in close contact with the tab 31 of the soft-packaged battery 3, the heat conducting contact area is increased, and the heat conducting effect is improved.

The heat conducting member 2 is preferably a heat conducting ceramic rod or an insulating heat pipe, and the heat conducting ceramic rod has not only excellent heat conducting effect but also insulating performance, so that the safety of electric connection of the tab 31 is better, and compared with other heat conducting members, the insulating heat pipe has very excellent heat conducting capability and can conduct heat transfer timely and efficiently.

In this embodiment, after the plurality of soft-pack batteries 3 are installed in the battery housing, the gaps between the soft-pack batteries 3 and the case 1 are fully filled with the heat-conducting glue (silica gel, epoxy, polyurethane), so that the soft-pack batteries 3 and the battery housing are encapsulated as a whole, and the thermal conductivity and the temperature uniformity of the high-capacity battery are further improved.

Example 2

As shown in fig. 6, in the embodiment 1, in order to timely dissipate the heat transferred to the side wall of the case 1, a liquid cooling device 7 or a heat dissipating device 8 is provided on the side wall of the case 1, and the heat transferred from the heat conducting member 2 to the side wall of the case 1 is processed by the liquid cooling device 7 or the heat dissipating device 8.

The liquid cooling device 7 may be provided integrally with the case 1 or may be provided separately. When the integrated type is set up, the liquid cooling device 7 includes the apron of embedding liquid cooling passageway and sealed liquid cooling passageway on box 1 lateral wall, and the circulation cooling medium in the liquid cooling passageway takes away the heat on the box 1 through cooling medium. When the liquid cooling device is independently arranged, the liquid cooling device 7 is a liquid cooling plate or a liquid cooling pipe which is tightly attached to the side wall of the box body 1, and heat on the box body 1 is timely taken away through the liquid cooling plate or the liquid cooling pipe. Preferably, the liquid cooling device 7 and the battery shell are integrally arranged, the liquid cooling device is simple in structure and good in cooling effect, and only a liquid cooling channel is required to be arranged on the battery shell.

As shown in fig. 1, a heat dissipating device 8 can be added to the case 1 to process heat. The heat dissipation device 8 can be a transverse heat dissipation rib and a vertical heat dissipation rib which are arranged on the side wall of the box body 1, and the heat dissipation ribs not only can realize heat dissipation and realize heat treatment, but also can be used as reinforcing ribs of the box body 1 to strengthen the rigidity of the box body. The heat dissipating device 8 may be a heat dissipating fin provided on a side wall of the case 1, and may dissipate heat from the case 1 through the heat dissipating fin.

Claims (10)

1. A high-capacity battery comprises a first cover plate, a second cover plate, a box body and a plurality of soft package batteries; the first cover plate and the second cover plate are arranged at the open ends of the two sides of the box body in a sealing way and are enclosed with the box body to form a battery shell; the plurality of soft package batteries are arranged in the battery shell, positive lugs of the plurality of soft package batteries are electrically connected with the first cover plate, and negative lugs of the plurality of soft package batteries are electrically connected with the second cover plate, so that the first cover plate and the second cover plate are respectively the positive electrode and the negative electrode of the high-capacity battery;

it is characterized in that the method comprises the steps of,

and heat conducting pieces are arranged in gaps between the positive electrode lug and the box body of each soft package battery and between the negative electrode lug and the box body of each soft package battery, and the heat conducting pieces transfer heat at the positive electrode lug or the negative electrode lug of the soft package battery to the box body to be dissipated.

2. The high-capacity battery according to claim 1, wherein the heat conductive member presses the positive electrode tab or the negative electrode tab of the pouch battery to be in direct contact with the case.

3. The high-capacity battery according to claim 2, wherein an insulating layer is provided between the positive electrode tab or the negative electrode tab of the soft pack battery and the case; the heat conducting piece extrudes the positive lug or the negative lug of the soft package battery to enable the insulating layer to be in direct contact with the box body.

4. The high-capacity battery as claimed in claim 3, wherein the positive electrode tab and the negative electrode tab of the pouch battery are bent to form a bent portion, and the bent portion is located between the insulating layer and the heat conductive member.

5. The high-capacity battery as claimed in claim 4, wherein the insulating layer is a PP insulating film or a PE insulating film, and has a thickness of 0.2mm to 1mm.

6. The high-capacity battery as claimed in any one of claims 1 to 5, wherein a liquid cooling device or a heat dissipating device for treating heat transferred from the heat conducting member is provided on a side wall of the case.

7. The high-capacity battery as claimed in claim 6, wherein a gap between the pouch battery and the case is filled with a heat conductive adhesive.

8. The high-capacity battery according to claim 7, wherein the positive electrode tab and the negative electrode tab of the plurality of pouch cells are located on the same side, and the positive electrode tab and the negative electrode tab are heat-transferred through one insulating heat-conductive member.

9. The high-capacity battery as claimed in claim 8, wherein the heat conductive member is a heat conductive ceramic rod or an insulating heat pipe.

10. The high capacity battery of claim 6, wherein the positive tab of the pouch battery is electrically connected to the first cover plate via a conductive tab and the negative tab is electrically connected to the second cover plate via another conductive tab.

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