Current connection device and battery pack

Abstract

The invention belongs to the technical field of battery packs, and discloses a current communication device and a battery pack, the current communication device comprises a conduction piece and a heat resistance assembly, the conduction piece is provided with a heat resistance structure penetrating through the conduction piece, the heat resistance assembly comprises at least one fusible lining, the fusible lining is arranged on the conduction piece in a sleeving mode, and the fusible lining is arranged on the conduction piece. And each fusible lining is internally provided with an insertion bulge which is in insertion connection with the corresponding heat-resistant structure. When thermal runaway occurs, the meltable lining absorbs heat and melts, so that heat on the conduction piece is absorbed, primary cooling is achieved, after the meltable lining which is originally filled at the heat resistance structure is melted, the heat resistance structure forms a cavity in the conduction piece, the conduction area when heat is transmitted on the conduction piece is reduced, and the heat dissipation efficiency is improved. Therefore, the transmission speed of heat on the conduction piece is delayed, the heat dissipation time of the heat on the conduction piece is prolonged, the transmitted heat is further reduced, double cooling is achieved, heat blocking is achieved through double cooling, the heat blocking effect is good, and safety is high.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and particularly to a current connection device and a battery pack. Background Art

[0002] With the increasing global demand for environmental protection and sustainable energy, electric vehicles have become an important development direction in the automotive industry. As the energy source of electric vehicles, the technical development of battery packs directly affects the performance and popularity of electric vehicles.

[0003] The connecting pieces in the battery pack are mainly used to conduct the electronic circuits between different single cells or modules, and at the same time, splice different single cells or modules into a whole to increase the strength.

[0004] Currently, the main requirement for the connecting piece is in terms of connection strength. However, after the single cell is used for a long time with cyclic charge and discharge, the temperature will gradually rise, and finally, the problem of thermal runaway will occur. Since multiple single cells constituting the battery pack are connected into a whole through the connecting piece, when one of the single cells has a thermal runaway, because the connecting piece for current conduction is generally made of metal, the high temperature generated by the thermally runaway single cell will be transmitted to the normal single cells through the connecting piece, thus affecting the normal single cells and having the risk of triggering thermal runaway of adjacent cells, with poor safety. Summary of the Invention

[0005] The purpose of the present invention is to provide a current connection device and a battery pack, which have good heat insulation effect and high safety.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] On the one hand, a current connection device is provided. The current connection device is used to achieve current conduction between single cells in the battery pack. The current connection device includes:

[0008] A conduction member, both ends of the conduction member are respectively connected to the adjacent single cells, and a heat insulation structure is provided on the conduction member, and the heat insulation structure penetrates through the conduction member;

[0009] A heat insulation component, the heat insulation component includes at least one fusible lining, and each fusible lining is provided with a plugging protrusion adapted to the heat insulation structure. The fusible lining is sleeved on the conduction member, and the plugging protrusion is inserted into the heat insulation structure.

[0010] Optionally, a heat dissipation structure is further provided on the conduction member. The heat dissipation structure is located between the heat insulation structure and the connection end of the conduction member and the single cell. The heat dissipation structure is recessed from one side surface of the conduction member to the other side surface of the conduction member.

[0011] Optionally, a heat dissipation structure is further provided on the conducting member, and the heat dissipation structure is located between the heat insulation structure and the connection end of the conducting member and the single battery. The heat dissipation structure protrudes from one surface of the conducting member to the other surface of the conducting member.

[0012] Optionally, the conducting member is an arched structure, and the conducting member of the arched structure is composed of a plurality of conductive plates stacked.

[0013] Optionally, the conducting member of the arched structure includes a bending portion and a straight plate portion. The straight plate portions are respectively arranged at both ends of the bending portion and are connected to the single battery, and the heat insulation structure is arranged on the straight plate portion.

[0014] Optionally, the heat insulation assembly further includes a protective jacket corresponding to each of the fusible linings. The protective jacket is sleeved on the fusible lining and applies a pressure to compress the fusible lining to the fusible lining.

[0015] Optionally, an installation through groove is further formed in the protective jacket. The installation through groove penetrates through the protective jacket, and the fusible lining is accommodated in the installation through groove.

[0016] Optionally, an overflow structure penetrating through the protective jacket is further formed in the protective jacket, and the overflow structure is communicated with the installation through groove.

[0017] Optionally, the overflow structure is a through hole structure penetrating through the protective jacket.

[0018] On the other hand, a battery pack is provided. The battery pack includes the current connection device described in any one of the above and a plurality of the single batteries, and the current connection device is used for current conduction between two adjacent single batteries.

[0019] Advantages of the present invention:

[0020] The present invention provides a current connection device. By sleeving a fusible inner lining on the conducting part and inserting the plugging protrusions of the fusible inner lining into the heat insulation structure of the conducting part, when any single battery undergoes thermal runaway, the heat on the thermally runaway single battery is transferred to the fusible inner lining through the conducting part. The fusible inner lining absorbs heat and melts, undergoing a phase change reaction, thereby absorbing the heat on the conducting part to achieve a first-level temperature reduction. After the originally filled fusible inner lining at the heat insulation structure melts, a cavity is formed on the conducting part in the heat insulation structure, reducing the conducting area when heat is transferred on the conducting part, thereby delaying the heat transfer speed on the conducting part, increasing the heat dissipation time on the conducting part, and further reducing the heat transferred to another single battery, thus achieving a second-level temperature reduction, avoiding the high temperature of the thermally runaway single battery from affecting normal single batteries, achieving heat blockage through double temperature reduction, having good heat insulation effect and high safety.

[0021] The present invention also provides a battery pack. By applying the above-mentioned current connection device, the influence of the thermally runaway single battery on the normal single battery is avoided. On the one hand, the risk of thermal runaway spread is reduced and the safety is improved. On the other hand, the damaged area is reduced and the maintenance cost is lowered. Description of the Drawings

[0022] Figure 1 is a three-dimensional structure schematic diagram of the current connection device provided by the present invention;

[0023] Figure 2 is a structural exploded view of the current connection device provided by the present invention;

[0024] Figure 3 is a structural cross-sectional view of the current connection device provided by the present invention;

[0025] Figure 4 is a structural schematic diagram when the current connection device provided by the present invention is connected to a single battery.

[0026] In the figure:

[0027] 100, single battery;

[0028] 1, conducting part; 11, heat insulation structure; 12, heat dissipation structure; 13, bending part; 14, straight plate part;

[0029] 2, heat insulation component; 21, fusible inner lining; 211, plugging protrusion; 22, protective outer sleeve; 221, installation through groove; 222, overflow structure. Detailed Embodiments

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present invention, rather than limiting the present invention. In addition, it should be noted that, for the sake of convenience of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0031] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal connection or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0032] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above the top of", and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below the bottom of", and "under the bottom of" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0033] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and do not have any special meanings.

[0034] With the increasing global demand for environmental protection and sustainable energy, electric vehicles have become an important development direction in the automotive industry. As the energy source of electric vehicles, the technical development of battery packs directly affects the performance and popularity of electric vehicles.

[0035] The connecting pieces in the battery pack are mainly used to conduct the electronic circuits between different single cells or modules, and at the same time, splice different single cells or modules into a whole to increase the strength.

[0036] Currently, the requirements for the connecting piece mainly focus on the aspect of connection strength. However, after the single battery is used for long-term cyclic charge and discharge, the temperature will gradually rise, and finally the problem of thermal runaway will occur. Since multiple single batteries that make up the battery pack are connected into a whole through the connecting piece, when one of the single batteries has a thermal runaway, because the connecting piece generally conducts current and is made of metal, the high temperature generated by the thermally runaway single battery will be transmitted to the normal single battery through the connecting piece, thus affecting the normal single battery and having the risk of triggering the thermal runaway of adjacent batteries, with poor safety.

[0037] Therefore, in order to strengthen the heat insulation effect, prevent the spread of thermal runaway, and improve safety, this embodiment provides a current connection device, which is used to realize the current conduction between single batteries in the battery pack.

[0038] As Figures 1 to 4 shown, the current connection device includes a conducting member 1 and a heat insulation component 2. The two ends of the conducting member 1 are respectively connected to the adjacent single batteries 100. A heat insulation structure 11 is provided on the conducting member 1, and the heat insulation structure 11 penetrates through the conducting member 1. The heat insulation component 2 includes at least one fusible lining 21, and each fusible lining 21 is provided with a plugging protrusion 211 adapted to the heat insulation structure 11. The fusible lining 21 is sleeved on the conducting member 1, and the plugging protrusion 211 is inserted into the heat insulation structure 11.

[0039] By sleeving the fusible lining 21 on the conducting member 1 and inserting the plugging protrusion 211 of the fusible lining 21 into the heat insulation structure 11 of the conducting member 1, when any single battery 100 has a thermal runaway, when the heat on the thermally runaway single battery 100 is transmitted to the fusible lining 21 through the conducting member 1, the fusible lining 21 absorbs heat and melts, undergoing a phase change reaction, thereby absorbing the heat on the conducting member 1 to achieve a first-stage temperature reduction. And the heat insulation structure 11, as a through structure provided on the conducting member 1, when the originally filled fusible lining 21 in the heat insulation structure 11 melts, the heat insulation structure 11 penetrating through the conducting member 1 will be exposed, thereby reducing the conduction area for heat transfer on the conducting member 1, thus delaying the heat transfer speed on the conducting member 1, increasing the heat dissipation time on the conducting member 1, and further reducing the heat transmitted to another single battery 100, thereby achieving a second-stage temperature reduction, avoiding the high temperature of the thermally runaway single battery 100 from affecting the normal single battery 100, and achieving heat insulation through double temperature reduction, with good heat insulation effect and high safety.

[0040] The heat insulation structure 11 penetrating through the conduction member 1 can be freely set according to requirements, as long as the conduction member 1 is ensured. In this embodiment, the heat insulation structure 11 is a plurality of through-round holes penetrating through the conduction member 1, and the plurality of through-round holes are uniformly arranged in the set area of the conduction member 1. When heat is transferred to this area, due to the reduction of its conduction area, the effect of delaying the heat transfer time and heat transfer speed is achieved. The fusible lining 21 is a phase change material, and its action process is that when the temperature of the conduction member 1 rises, it will trigger the phase change reaction of the phase change material, and during the phase change reaction, the phase change material absorbs heat to achieve the cooling effect on the conduction member 1.

[0041] Optionally, as Figure 2 、 Figure 3 shown, a heat dissipation structure 12 is also provided on the conduction member 1. The heat dissipation structure 12 is located between the heat insulation structure 11 and the connection end of the conduction member 1 and the single battery 100. The heat dissipation structure 12 is recessed from one side surface of the conduction member 1 to the other side surface of the conduction member 1. By forming the heat dissipation structure 12 by concave inward on the surface of the conduction member 1, the surface area of the conduction member 1 in contact with air is increased, thereby improving the heat dissipation effect of the conduction member 1, and cooperating with the fusible lining 21 and the heat insulation structure 11 to achieve triple heat dissipation, thereby further improving the heat barrier effect.

[0042] In this embodiment, the heat dissipation structure 12 formed by concave inward from the surface of the conduction member 1 can be a blind hole or a groove structure.

[0043] Optionally, a heat dissipation structure 12 is also provided on the conduction member 1. The heat dissipation structure 12 is located between the heat insulation structure 11 and the connection end of the conduction member 1 and the single battery 100. The heat dissipation structure 12 protrudes from one side surface of the conduction member 1 to the other side surface of the conduction member 1. By forming the heat dissipation structure 12 by convex outward on the surface of the conduction member 1, the surface area of the conduction member 1 in contact with air is increased, thereby improving the heat dissipation effect of the conduction member 1, and cooperating with the fusible lining 21 and the heat insulation structure 11 to achieve triple heat dissipation, thereby further improving the heat barrier effect.

[0044] Optionally, as Figure 3 shown, the conduction member 1 is an arched structure, and the arched conduction member 1 is composed of multiple conductive plates stacked. By setting the conduction member 1 as an arched structure, on the one hand, it is convenient to dock with the single batteries 100 on both sides. On the other hand, by making it into an arched structure, while reducing the distance between the two single batteries 100, the structural strength of the conduction member 1 itself is ensured, so that more single batteries 100 can be accommodated in the battery pack, improving the energy density, and being composed of multiple conductive plates stacked, compared with the solid conduction member 1, it is easier to bend it to form an arched structure.

[0045] Optionally, as Figure 3As shown, the conducting member 1 of the arched structure includes a bent portion 13 and a straight plate portion 14. The straight plate portions 14 are respectively arranged at both ends of the bent portion 13 and are connected to the single cell 100. The heat insulation structure 11 is arranged on the straight plate portion 14. By arranging the corresponding heat insulation structures 11 on each straight plate portion 14, the two sets of heat insulation structures 11 cooperate with each other, thereby improving the heat insulation effect on the conducting member 1 and enhancing the safety.

[0046] In this embodiment, in order to further improve the heat insulation effect of the conducting member 1, heat dissipation structures 12 are respectively arranged on each straight plate portion 14.

[0047] Optionally, as Figure 2 shown, the heat insulation component 2 further includes a protective jacket 22 corresponding to the fusible inner lining 21 one by one. The protective jacket 22 is sleeved on the fusible inner lining 21 and applies pressure to compress the fusible inner lining 21. By arranging the protective jacket 22, on the one hand, the connection strength between the fusible inner lining 21 and the conducting member 1 can be enhanced, and on the other hand, the outside of the fusible inner lining 21 can be protected to avoid accidental damage and affect the heat insulation effect.

[0048] Optionally, as Figure 2 shown, an installation through groove 221 is also formed on the protective jacket 22. The installation through groove 221 penetrates through the protective jacket 22, and the fusible inner lining 21 is accommodated in the installation through groove 221. By forming the installation through groove 221 for accommodating the fusible inner lining 21 on the protective jacket 22, on the one hand, it is convenient to assemble the protective jacket 22 and the fusible inner lining 21, and on the other hand, the groove wall of the installation through groove 221 plays a role in limiting the fusible inner lining 21 to prevent the fusible inner lining 21 from being misaligned.

[0049] Optionally, as Figure 2 shown, an overflow structure 222 penetrating through the protective jacket 22 is also formed on the protective jacket 22. The overflow structure 222 is communicated with the installation through groove 221. By arranging the overflow structure 222 on the protective jacket 22, when the fusible inner lining 21 absorbs heat and melts, the melted part of the fusible inner lining 21 can flow out in time through the overflow structure 222 of the protective jacket 22, thereby accelerating the heat dissipation effect.

[0050] Specifically, the overflow structure 222 is a through hole structure penetrating through the protective jacket 22. By adopting the through hole structure as the overflow structure 222, it is convenient to process the overflow structure 222 on the protective jacket 22. The through hole structure can be a round hole or an elongated hole. In this embodiment, a plurality of uniformly arranged round holes are used as the overflow structure 222 on the protective jacket 22 to increase the overflow area, improve the flow rate, and ensure the heat dissipation effect.

[0051] In this embodiment, a battery pack is further provided. The battery pack includes the above current connection device and a plurality of single cells 100. The current connection device is used for current conduction between two adjacent single cells 100. By applying the above current connection device, the influence of a thermally out-of-control single cell 100 on a normal single cell 100 is avoided. On the one hand, the risk of thermal runaway spread is reduced and the safety is improved. On the other hand, the affected area is reduced and the maintenance cost is lowered.

[0052] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Current connection device, which is used to achieve current conduction between individual batteries in a battery pack, characterized in that, The current connection device includes: A conduction member, both ends of the conduction member are respectively connected to the adjacent single cell, a heat resistance structure is provided on the conduction member, and the heat resistance structure penetrates through the conduction member; A heat resistance assembly, the heat resistance assembly includes at least one fusible inner lining, and each fusible inner lining is provided with an insertion protrusion adapted to the heat resistance structure, the fusible inner lining is sleeved on the conduction member, and the insertion protrusion is inserted into the heat resistance structure.

2. The current connection device according to claim 1, characterized in that A heat dissipation structure is further provided on the conduction member, the heat dissipation structure is located between the heat resistance structure and the connection end of the conduction member and the single cell, and the heat dissipation structure is recessed from one surface of the conduction member to the other surface of the conduction member.

3. The current connection device according to claim 1, characterized in that, A heat dissipation structure is further provided on the conduction member, the heat dissipation structure is located between the heat resistance structure and the connection end of the conduction member and the single cell, and the heat dissipation structure protrudes from one surface of the conduction member to the other surface of the conduction member.

4. The current connection device according to claim 1, wherein The conduction member is in an arched structure, and the arched conduction member is composed of multiple layers of conductive plates stacked.

5. The current connection device according to claim 4, wherein, The arched conduction member includes a bending portion and straight plate portions, the two straight plate portions are respectively arranged at both ends of the bending portion and are connected to the single cell, and the heat resistance structure is arranged on the straight plate portion.

6. The current connection device according to claim 1, wherein, The heat resistance assembly further includes a protective outer sleeve corresponding to the fusible inner lining one by one, the protective outer sleeve is sleeved on the fusible inner lining, and applies a pressure to compress the fusible inner lining to the fusible inner lining.

7. The current connection device according to claim 6, characterized in that, An installation through groove is further provided on the protective outer sleeve, the installation through groove penetrates through the protective outer sleeve, and the fusible inner lining is accommodated in the installation through groove.

8. The current connection device according to claim 7, wherein An overflow structure penetrating through the protective outer sleeve is further provided on the protective outer sleeve, and the overflow structure is communicated with the installation through groove.

9. The current connection device according to claim 8, wherein The overflow structure is a through hole structure penetrating through the protective outer sleeve.

10. Battery pack, characterized in that, The battery pack includes the current connection device according to any one of claims 1-9 and multiple single cells, and the current connection device is used for current conduction between two adjacent single cells.

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