WO2021036030A1 - 电池包 - Google Patents

电池包 Download PDF

Info

Publication number
WO2021036030A1
WO2021036030A1 PCT/CN2019/120077 CN2019120077W WO2021036030A1 WO 2021036030 A1 WO2021036030 A1 WO 2021036030A1 CN 2019120077 W CN2019120077 W CN 2019120077W WO 2021036030 A1 WO2021036030 A1 WO 2021036030A1
Authority
WO
WIPO (PCT)
Prior art keywords
bracket
battery
battery pack
opening
passage
Prior art date
Application number
PCT/CN2019/120077
Other languages
English (en)
French (fr)
Inventor
焦石平
邓春英
樊秀斌
Original Assignee
苏州宝时得电动工具有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201910785493.7A external-priority patent/CN112490560A/zh
Priority claimed from CN201910785506.0A external-priority patent/CN112490561A/zh
Application filed by 苏州宝时得电动工具有限公司 filed Critical 苏州宝时得电动工具有限公司
Priority to EP19943824.3A priority Critical patent/EP4020680A4/en
Publication of WO2021036030A1 publication Critical patent/WO2021036030A1/zh
Priority to US17/678,509 priority patent/US20220181718A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6551—Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/643—Cylindrical cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/659—Means for temperature control structurally associated with the cells by heat storage or buffering, e.g. heat capacity or liquid-solid phase changes or transition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/247—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the invention relates to the technical field of electric tools, in particular to a battery pack.
  • the battery pack is generally a battery module composed of multiple cells in series and parallel. Further, a plurality of battery modules can also be connected in series or in parallel to form a battery cell group with a certain voltage and capacity.
  • the cells in the battery pack will quickly generate a large amount of heat during the discharge process; when the heat is not released in time, connect the battery pack to the charger. At this time, the charger cannot charge the battery pack normally. The reason is that the charger usually sets a circuit protection program, and only when the temperature of the battery pack has reached a predetermined low temperature, the charger will start the charging circuit to perform the charging work.
  • the battery pack does not have better heat dissipation performance, the heat generated during the discharge process cannot be dissipated quickly, and it will inevitably require a lot of time to cool down before the next charge.
  • Another situation is that if the charger is not equipped with a circuit protection program, when the battery pack is electrically connected to the charger for charging before it has cooled down, it will damage the cells, weaken the discharge capacity of the battery pack, and shorten the battery pack. The longevity of this product may even cause safety accidents.
  • one method in order to dissipate heat from the battery pack, one method is to provide a battery holder with a heat dissipation function outside the battery pack.
  • the battery holder is at least partially made of a thermally conductive material to remove the heat generated in the battery.
  • the drain is conducted to the battery holder, and then dispersed into the air from the holder.
  • the battery holder can discharge the heat loss generated in the battery to the air to a certain extent.
  • the heat generated during the discharge process is relatively rapid, in the absence of auxiliary heat dissipation equipment such as fans, it is found during use that most of the heat stays on the battery holder, causing the heat on the battery holder to not be quickly conducted to the air. .
  • the battery cell is in direct contact with the inside of the battery holder, and the temperature of the battery cell is transferred outwards, when the temperature of the battery cell and the battery holder tends to be the same, the battery holder will not conduct further heat, that is, the surface of the battery cell The temperature will not be further reduced, and it will not be able to achieve the ideal heat dissipation effect of the battery cell.
  • the present invention provides a battery pack, which can improve the cooling efficiency of the battery during the discharge of the battery pack, and effectively reduce the temperature of the battery and the bracket directly in contact with the battery.
  • a battery pack includes: at least one battery module, the battery module includes a plurality of electrically connected cells; a bracket made of a thermally conductive material, the bracket includes a plurality of mounting parts and a connecting part, the connection The mounting part relatively fixedly connects a plurality of mounting parts together.
  • the mounting part is formed with an accommodating cavity for accommodating the battery.
  • the bracket is preset with a plurality of passages through the bracket, and the plurality of passages are distributed in Between adjacent mounting parts; a shell covering the outside of the bracket, the shell is provided with airflow holes that can communicate with the plurality of passages.
  • the battery pack further includes a heat storage element at least partially attached to the outside of the support, and the specific heat capacity of the heat storage element is greater than the specific heat capacity of the support.
  • the heat storage element is made of a material with a specific heat capacity greater than 2.6J/(g.K).
  • thermal conductivity of the thermally conductive material is greater than 0.3 W/m.k.
  • the bracket is provided with a deforming portion on the side wall of the mounting portion, the outer diameter of the battery core is smaller than the aperture of the accommodating cavity, and the battery is accommodated in the accommodating cavity through the deformation The elastic deformation of the part is clamped and fitted in the accommodating cavity.
  • the deformed portion is at least one protrusion formed inwardly on the side wall of the mounting portion.
  • the outer diameter of the battery core is larger than the aperture of the accommodating cavity, and the battery core is arranged in the accommodating cavity of the mounting part by means of thermal compression and expansion.
  • the battery core has a first end surface and a second end surface opposite to each other, and a side surface surrounding the first end surface and the second end surface, and the bonding area between the side surface and the mounting portion occupies at least 80% of the side surface.
  • passages are distributed between the outer side walls of the adjacent mounting parts, and the minimum distance of the passages is greater than 1.5 mm.
  • the passage extends along an axial direction perpendicular to the battery core.
  • heat sinks are respectively provided on the side walls of the mounting portion on both sides of the passage, and the heat sinks are distributed at intervals along the axial direction of the battery core, and the distributed length of the heat sink accounts for 3/ of the total axial length of the battery core. 4.
  • the battery pack further includes a heat storage member at least partially attached and installed on the outside of the bracket.
  • the heat storage member is provided with a first opening communicating with the passage and the air flow hole;
  • the housing includes an upper cover and a lower cover opposed to each other.
  • the airflow holes include: an upper opening provided on the upper cover, a lower opening provided on the lower cover; Axially penetrates the bracket.
  • the battery pack further includes a pressing member, the pressing member is pressed on the outside of the heat storage member for applying a force to the heat storage member to clamp the bracket, and the pressing member
  • the tightening piece is provided with a second opening communicating with the first opening and the airflow hole; along the axial direction perpendicular to the battery core, the first opening and the second opening Distributed on both sides of the passage in order from the inside to the outside; the upper opening, the lower opening, the passage and the first opening and the second opening can cooperate to form a heat dissipation channel.
  • the housing includes an upper cover and a lower cover opposed to each other, and the air flow holes include: an upper opening provided on the upper cover, a lower opening provided on the lower cover; An end cover is provided in the axial direction of the battery core, and a third opening is provided on the end cover.
  • the passage penetrates the bracket along the axial direction of the battery core, and is along the axial direction of the battery core. The lower opening, the upper opening, the third opening and the passage can cooperate to form a heat dissipation channel.
  • a battery pack includes: at least one battery module, the battery module includes a plurality of electrically connected cells; a bracket made of a thermally conductive material, the bracket includes a plurality of mounting parts and a connecting part, the The connecting part relatively fixedly connects a plurality of mounting parts together.
  • the mounting part is formed with a accommodating cavity for accommodating the battery.
  • the bracket is preset with a plurality of passages passing through the bracket, and the plurality of passages are along Extend perpendicular to the axial direction of the battery core; a shell, the shell is provided with airflow holes that can communicate with the plurality of passages.
  • the battery pack provided in the embodiments of the present application improves the structure of the battery pack, and forms an independent heat dissipation channel inside the battery pack, which can efficiently perform high efficiency on the bracket in the battery pack and the cells attached to the bracket.
  • the heat dissipation of the battery pack enables the battery pack to be connected to the charger for charging immediately after the discharge is completed, thereby saving charging time for the user, while effectively protecting the battery cell and improving the discharge capacity and life of the battery pack.
  • the heat generated by the battery core during use can be efficiently conducted out through the heat dissipation channel.
  • the outer side of the bracket is attached to a heat storage element made of a material with high specific heat capacity, and the heat storage element can efficiently absorb the heat in the bracket, so as to reliably ensure that the battery core and the support attached to the battery core Not over-temperature.
  • the improved battery pack When the improved battery pack is in use, it can extend the working time of the battery pack, improve the discharge capacity of the battery pack, and is especially suitable for high temperature and harsh environments.
  • the bracket, the heat storage element and the outer shell of the battery pack of the present application are matched to form a multi-path parallel direct-blowing heat dissipation channel, which can dissipate the electric core and the bracket, thereby further controlling the temperature of the inner surface of the battery pack and the bracket.
  • the present invention also provides a battery pack with both good waterproof performance and good heat dissipation performance, which can be better adapted to harsh outdoor working environments such as high temperature and rain.
  • a battery pack includes: at least one battery module, the battery module is formed by electrically connecting a plurality of battery cells; a bracket, the bracket includes a plurality of mounting parts, and a ground for relatively fixing the mounting parts Connecting parts connected together; inside the mounting part is formed a accommodating cavity for accommodating the battery, the bracket is preset with a passage through the bracket, and the passage is distributed in the adjacent mounting parts In between, in the axial direction of the battery core, the bracket has a first end and a second end opposite to each other, and the accommodating cavity has openings at the first end and the second end, respectively; the battery pack It also includes a sealing device for sealing the opening so as to isolate the cell located in the containing cavity from the outside.
  • passage and the accommodating cavity are independent of each other and perpendicular to the axial direction of the battery core.
  • the sealing device includes: a sealing element and an end cover respectively located at the first end and the second end of the support, the sealing element is arranged inside the outer periphery of the end cover, when the end cover and one end of the support When mating, the end cover and one end of the bracket form a sealed space isolated from the passage.
  • the end cover is provided with a first installation groove for installing the seal
  • the first end or the second end is respectively provided with a pressing part, when the end cover and one end of the bracket When mating, the pressing part can at least partially extend into the first installation groove to press the sealing element.
  • At least one end of the bracket is provided with an electrical connection piece
  • the bracket is provided with a second installation groove at the end where the electrical connection piece is provided
  • an elastic abutting member is provided in the second installation groove
  • One end of the abutting member extends into the second installation groove, and the other end is in contact with the sealing member.
  • the abutting member includes any one of the following: EVA foam, O-ring, and heat shrinkable tube.
  • the abutting member is formed by injecting glue into the second installation groove.
  • the battery pack further includes a casing arranged outside the bracket, the casing is provided with an airflow hole communicating with the passage, and the airflow hole cooperates with the passage to form a heat dissipation channel.
  • the battery pack further includes: a heat storage element, the heat storage element is at least partially attached and mounted on the outside of the bracket, and the specific heat capacity of the heat storage element is greater than the specific heat capacity of the bracket.
  • the outer side wall of the mounting portion is provided with first radiating fins at intervals, the first radiating fins are located between the connecting portions, and the first radiating fins of two adjacent mounting portions are arranged facing each other , Forming a central heat dissipation area.
  • a predetermined gap is formed between the adjacent mounting portions, the housing includes an upper cover and a lower cover opposed to each other, the upper cover is provided with an upper opening communicating with the predetermined gap, and the lower cover A lower opening communicating with the predetermined gap is provided; the side wall of the upper heat storage element is provided with a first opening communicating with the predetermined gap and the upper opening and the lower opening;
  • the first openings are distributed on both sides of the central heat dissipation area, at least the upper opening, the lower opening, the first opening and the center
  • the heat dissipation area can cooperate to form the heat dissipation channel.
  • the battery pack further includes a pressing member, the pressing member is pressed on the outside of the heat storage member for applying a force to the heat storage member to clamp the bracket, and the pressing member
  • the tightening piece is provided with a second opening communicating with the first opening and the upper opening and the lower opening; along the axial direction perpendicular to the battery core, the first opening, the The second openings are distributed on both sides of the central heat dissipation area in order from the inside to the outside; the upper opening, the lower opening, the central heat dissipation area and the first and second openings The cooperation can form the heat dissipation channel.
  • the passage and the accommodating cavity are independent of each other and parallel to the axial direction of the battery, the passage has air vents respectively located at the first end and the second end, and the sealing device is used for sealing The opening separates the receiving cavity from the passage.
  • the sealing device includes: an end cover, a first sealing part, and a second sealing part, wherein the end cover is provided with a third opening communicating with the vent, and the first sealing part surrounds The third opening of the end cover is provided, and the second sealing portion is provided on the inner side of the periphery of the end cover.
  • the housing also includes a housing covering the outside of the bracket.
  • the housing is provided with an airflow hole communicating with the passage.
  • the airflow hole and the third opening cooperate with the passage to form heat dissipation. aisle.
  • the outer periphery of the end cover is provided with a first installation groove for installing the second sealing part, and the bracket is provided with an extrusion part that is directly opposite to the first installation groove;
  • a third installation groove is further provided outside the third opening, and the third installation groove is used to install the first sealing portion.
  • the battery pack provided in the embodiment of the present application improves the structure of the battery pack.
  • the bracket for installing the battery core is preset with a passage through the bracket, and the passage is connected to the outside without affecting the battery.
  • the bracket in the battery pack and the cells attached to the bracket can be efficiently dissipated; in addition, the battery pack is also provided with a sealing device for sealing the openings at both ends of the bracket, so that The battery cell located in the bracket is isolated from the outside.
  • the battery pack has good waterproof performance and good heat dissipation performance, and can be better adapted to harsh outdoor working environments such as high temperature and rain.
  • FIG. 1 is a schematic structural diagram of a battery pack provided in an embodiment of the present application
  • FIG. 2 is a cross-sectional view of the battery pack A-A provided in Figure 1;
  • FIG 3 is an exploded view of the battery pack provided in Figure 1;
  • Fig. 4 is an exploded view of the battery assembly in the battery pack provided in Fig. 1;
  • FIG. 5 is a front view of the battery assembly in the battery pack provided in FIG. 1;
  • FIG. 6 is a schematic diagram of the distribution of heat sinks on the bracket provided in the embodiment of the present application.
  • Fig. 7 is a structural schematic diagram of the matching positions of the bracket, the seal, and the end cover in the battery pack in Fig. 1;
  • FIG. 8 is a partial enlarged view of M in FIG. 7;
  • Fig. 9 is a partial enlarged view at N in Fig. 7;
  • FIG. 10 is a schematic structural diagram of a battery pack provided in an embodiment of the present application.
  • Figure 11 is a B-B cross-sectional view of the battery pack provided in Figure 10;
  • Figure 12 is an exploded view of the battery pack provided in Figure 10;
  • FIG. 13 is an exploded view of the battery assembly of the battery pack in FIG. 10;
  • FIG. 14 is a schematic diagram of the structure of the bracket of the battery pack in FIG. 13;
  • Figure 15 is a front view of the bracket in Figure 14;
  • 16 is a structural schematic diagram of the matching positions of the bracket, the seal, and the end cover in the battery pack in FIG. 10;
  • Fig. 17 is a partial enlarged view of H in Fig. 16.
  • the specification of this application provides an improved battery pack. Compared with the prior art, in the process of discharging the cells of the battery pack, the cooling efficiency of the cells can be improved, and the cells and direct contact with the cells can be effectively reduced.
  • the temperature of the bracket improves the discharge capacity of the battery pack.
  • the battery pack mainly includes a battery cell 1, a bracket 2, a casing 4, a sealing device, and some components for cooperating installation. Among them, as shown in FIG. 4 or FIG. 10, at least the battery cell 1, the support 2, the sealing device, etc. can form the battery assembly 100 installed in the housing 4.
  • the number of the battery cores 1 and the series-parallel connection between the battery cores 1 can be adjusted according to the voltage of the battery core 1 itself and different nominal voltages, which is not specifically limited in this application.
  • the battery cell 1 can form a battery module through the conductive sheet 11 in series, or in parallel, or a combination of series and parallel.
  • the number of the battery module can be one or two or more.
  • FIG. 2 there may be two battery modules (one on each side). Among them, one battery module has 8 battery cells (as shown in Figure 4), and the other battery module has 7 battery cells. Further, two battery modules are connected in series through the power supply board 12 to output a voltage of 60V.
  • the number of the battery modules is also two.
  • two battery modules can be connected in parallel through the power supply board 12.
  • Each battery module may contain 15 4-volt battery cells 1, and a group of battery cells with a nominal voltage of 60 volts formed by connecting 15 battery cells 1 in series. Then the two battery modules are connected in parallel, so the output voltage is still 60V, but the current is twice that when 15 cells are connected in series.
  • the housing 4 may include an upper cover 42, a lower cover 43, and a first side plate 44, a second side plate 45, a first side cover 46, and a second side provided between the upper cover 42 and the lower cover 43. Cover 47.
  • the first side plate 44 and the second side plate 45 are arranged oppositely, and the first side cover 46 and the second side cover 47 are arranged oppositely.
  • the casing 4 is provided with an airflow hole, and the airflow hole is used to introduce and lead outside air into and out of the battery pack.
  • the air flow hole may include an upper opening 420 provided on the upper cover 42 and a lower opening 430 provided on the lower cover 43.
  • the airflow holes of the casing 4 cooperate with other structures in the battery pack to form a heat dissipation channel 6 to cool the battery core 1 and the support 2.
  • the cell 1 has a first end surface and a second end surface opposite to each other, and side surfaces surrounding the first end surface and the second end surface.
  • the shape of the cell 1 can be cylindrical. Of course, the shape of the cell 1 can also be adjusted according to actual needs. For example, it can be a rectangular parallelepiped, or an approximate rectangular parallelepiped, or even other special-shaped structures.
  • the shape and structure of the battery cell 1 are not specifically limited in this application. In this specification, the battery core 1 is mainly cylindrical for illustration, and the shapes of other battery cores can be compared with this application.
  • a skin is provided on the surface of a general battery core 1, and the skin is generally made of an insulating material (for example, plastic) with poor thermal conductivity.
  • the battery cell 1 is provided with a skin, since the skin is sheathed on the outer surface of the battery cell 1 by wrapping, the skin cannot be completely attached to the battery cell 1. This leads to the formation of at least part of the air section between the skin and the cell 1. The air section and the skin with poor thermal conductivity will affect the electric core 1 to conduct heat outward.
  • the outer surface of the cell 1 is peeled, that is, no skin is provided. Afterwards, the skinned cell 1 is directly mounted in the bracket 2 to improve the heat transfer efficiency.
  • the bracket 2 is mainly used to install the battery 1.
  • the bracket 2 is made of a heat-conducting material, which can conduct the heat on the cell 1 to the outside in time.
  • the thermal conductivity of the thermally conductive material is greater than 0.3 W/m.k.
  • the bracket 2 may be an integral bracket, which may be integrally formed, or may be provided as a component, and then connected together by assembly.
  • the specific heat capacity range of the bracket 2 is greater than 1.8J/(gK) to ensure that the bracket 2 can absorb the heat in the cell 1 with a higher efficiency, combined with its high thermal conductivity, can quickly conduct the absorbed heat outward Out.
  • the material of the bracket 2 can be polypropylene (PP), high-density polyethylene (HDPE), low-density polyethylene (LDPE), and the like.
  • the bracket 2 may include a plurality of mounting parts 20, and a receiving cavity 21 for accommodating the battery core 1 is formed inside the mounting part 20.
  • the number of the mounting parts 20 may be the same as the number of the battery cells 1, or may be greater than the number of the battery cells 1.
  • the battery core 1 is at least partially fitted in the receiving cavity 21.
  • the integral bracket 2 has a plurality of mounting portions 20, and the mounting portions 20 in the bracket 2 can be arranged in a predetermined arrangement sequence.
  • a plurality of mounting portions 20 may be arranged at a certain distance in the first direction to form a row of mounting portions 20; in a second direction perpendicular to the first direction, the multiple rows of mounting portions 20 may be arranged at a certain distance.
  • the mounting part 20 can also be arranged in other order according to actual use needs, and the application is not limited thereto.
  • the bracket 2 is preset with a plurality of passages 22 passing through the bracket 2, and the plurality of passages 22 are distributed between adjacent mounting portions 20.
  • the inside of the bracket 2 refers to the area enclosed by the central connection of the outermost battery cell 1 in the battery module.
  • the passage 22 and the containing cavity 21 are independent of each other. When the passage 22 for circulating air flow for heat dissipation is independent of the accommodating cavity 21 for accommodating the cell 1 and is not connected, the cell 1 can use the heat-conducting bracket 2 itself to conduct heat, and the thermal conductivity is high.
  • the air flow passage 22 communicates with the receiving cavity 21, because the air flow passage 22 communicates with the receiving cavity 21 mainly by using air to conduct heat, and the thermal conductivity of air does not have a heat conducting bracket 2
  • the thermal conductivity is high and the thermal conductivity is poor.
  • the passage 22 and the accommodating cavity 21 are independent of each other, it is also conducive to the installation of the subsequent waterproof sealing structure. Compared with the situation that the passage 22 and the accommodating cavity 21 are not independent of each other, it is not easy to interfere with the waterproof sealing structure. .
  • the mounting portion 20 may be a cavity with a certain wall thickness.
  • the hollow part of the cavity is the containing cavity 21.
  • the installation portion 20 includes a side wall, a positioning opening, and an installation opening opposite to the positioning opening.
  • the outer diameter of the cell 1 is larger than the aperture of the accommodating cavity 21, and the cell 1 can be arranged in the accommodating cavity 21 of the mounting portion 20 by means of thermal compression and expansion.
  • the outer diameter of the cell 1 is larger than the aperture of the accommodating cavity 21, and the initial surface area of the accommodating cavity 21 in the bracket 2 is smaller than that of the cell 1.
  • the outer surface of the battery cell 1 can be directly and completely attached to the side wall in the mounting portion 20, and the bonding area occupies the side area The percentage (ie, the degree of fit) can be close to 100%.
  • the bracket 2 is provided with a deforming portion 23 on the side wall of the mounting portion 20, the outer diameter of the battery 1 is smaller than the aperture of the accommodating cavity 21, and the battery 1 passes through
  • the mounting portion 20 provided with the deforming portion 23 is elastically deformed and clamped in the receiving cavity 21.
  • the deforming portion 23 may be at least one protrusion formed inwardly on the side wall of the mounting portion 20.
  • the initial surface area of the accommodating cavity 21 in the bracket 2 is larger than the outer surface area of the battery cell 1.
  • the number of the protrusions is one or two for illustration.
  • the protrusion may be arranged on a side relatively close to the installation opening.
  • the protrusion will be elastically deformed, so that the battery cell 1 can be clamped in the mounting portion 20 while the battery cell 1 is installed, so as to ensure the battery cell 1
  • the outer surface of 1 is attached to the receiving cavity 21 of the mounting portion 20.
  • each battery cell 1 can be tightly fitted in the receiving cavity 21 of the mounting portion 20.
  • the deformed portion 23 may also be an opening provided on the side wall of the mounting portion 20. By providing the opening, the mounting portion can be deformed, so that it can fit the battery core 1 better.
  • the form of the deforming portion 23 is not limited to the above example.
  • the battery pack may also include a heat storage member 3 at least partially attached to the outside of the bracket 2.
  • the heat storage element 3 may be made of a material with a large specific heat capacity with strong heat absorption capacity. Specifically, the specific heat capacity of the heat storage element 3 is greater than the specific heat capacity of the support 2, and the heat storage element 3 is at least partially mounted on the outside of the support 2 so that the heat in the support 2 can be efficiently carried out. It absorbs, so as to ensure that the temperature of the bracket 2 and the battery cell 1 installed in close contact with the bracket 2 does not exceed the temperature. When the battery pack is placed on the charger, a large amount of heat accumulated in the heat storage element 3 can be cooled by starting the fan of the charger.
  • the heat storage element 3 is made of a heat storage material with a high specific heat capacity greater than 2.6 J/(g.K).
  • the high specific heat capacity material is a non-phase change material, for example, it can be any one of the following: polymer material, high thermal conductivity material, silica gel; of course, the high specific heat capacity material can also be a phase change material.
  • the heat storage element 3 is a non-phase change high specific heat capacity material, it can absorb heat with a stable specific heat capacity parameter during the heat absorption process, and no phase change occurs during the heat absorption process.
  • the heat storage element 3 does not undergo a phase change during the heat absorption process, it not only can maintain a high heat absorption efficiency, but also helps simplify the overall structure of the battery pack.
  • phase change material When a phase change material is used as the main material of the heat storage element 3, since its state will change during use, for example, it will change from a solid state to a molten state. Therefore, it is necessary to provide a structure for containing the phase change material. Cavity, or the phase change material is sealed.
  • a connecting portion 24 is provided between two adjacent mounting portions 20 in the bracket 2. Specifically, the connecting portion 24 and the sealing end 25 are integrally formed. The connecting portion 24 is located close to the end of the mounting portion 20. The ends of a plurality of the mounting parts 20 form both ends of the bracket 2.
  • a sealing device is provided at both ends of the bracket 2. Specifically, the ends of a plurality of the mounting portions 20 form the two ends of the bracket 2 (ie, the sealed ends 25).
  • the sealing device includes a sealing element 7 and an end cover 8.
  • the sealing element 7 is arranged between the sealing end 25 and the end cover 8 to reliably seal the cell 1.
  • the shape and structure of the sealing element 7 are mainly determined based on the shape of the containing space formed by the end cap 8 and the sealing end 25 and the position to be sealed.
  • the sealed end 25 may be a ring-shaped protrusion at the end of the bracket 2, and the protrusion may be integrally formed with the bracket 2, or the protrusion may be fixed to the end of the bracket 2 by a detachable connection.
  • the sealing member 7 when the end cover 8 is not provided with an opening, the sealing member 7 may be in the form of a sealing ring with a certain wall thickness. As shown in Fig. 13, when the end cover 8 is provided with an opening, the sealing member 7 may be in the form of a sealing sheet provided with an opening.
  • a heat dissipation channel 6 is formed in the battery pack. Please refer to FIGS. 1 to 6 in combination.
  • the flow direction of the airflow in the heat dissipation channel 6 may be perpendicular to the axial direction of the battery cell 1 as a whole.
  • a passage 22 is formed with a predetermined gap between the outer walls of two adjacent mounting portions 20. The passage 22 extends along an axial direction perpendicular to the battery core 1, and a first opening 31 communicating with the predetermined passage 22 and the air flow hole is provided on the side wall of the heat storage element 3.
  • the heat storage element 3 may include a first part and a second part, and the first part and the second part may be attached and fixed to the outside of the bracket 2 through a detachable connection method or other limiting methods. Wherein, the inner surface of the first part and the second part can match the outer surface of the bracket 2.
  • the first part and the second part are provided with a first opening 31 communicating with the passage 22.
  • the passage 22 is used to cooperate with the first opening 31 of the heat storage member 3 in the battery pack and the air flow hole of the casing 4, so as to form the heat dissipation channel 6.
  • the connecting portion 24 is located close to the end surface of the battery core 1. In the axial direction of the battery core 1, except for the position of the connecting portion 24, the passage 22 between the two connecting portions 24 at the end may be used for circulating air flow. When a long-length passage 22 is formed between the cells 1 of the battery pack, it is beneficial to ensure that the battery pack has a better heat dissipation effect during use.
  • the passages are distributed between the outer side walls of the adjacent mounting parts.
  • the minimum spacing of the passages is greater than 1.5 mm.
  • heat dissipation fins 241 are respectively provided on the side walls of the mounting portion 20 between the connecting portions 24.
  • the radiating fins are distributed at intervals along the axial direction of the battery core 1.
  • the radiating fins 241 of two adjacent mounting portions 20 are arranged facing each other to form a central heat dissipation area.
  • the heat sink 241 is mainly used to quickly transfer the heat transferred from the battery core 1 to the support 2 through the heat dissipation channel 6 to the outside.
  • the distributed length of the heat sink 241 accounts for 3/4 of the total axial length of the battery core 1.
  • the two mounting parts 20 The distance between the outer side walls cannot be too small, generally not less than 5 mm. Taking into account that the overall size of the battery pack cannot be too large, especially due to the limitation of the installation space, the size of the outer casing of the battery pack cannot be too large. Generally, the distance between the outer side walls of the two installation parts 20 cannot be too large, generally not More than 15 mm. On the whole, on the premise that the heat sink 241 is provided, the distance of the passage 22 along the axial direction perpendicular to the battery core 1 is between 5 mm and 15 mm.
  • the battery pack may also be provided with a pressing member 5.
  • the pressing member 5 is pressed on the outer side of the heat storage member 3 to apply a force to the heat storage member 3 to clamp the bracket 2.
  • the pressing member 5 may be made of a rigid material, and the pressing member 5 may be attached to the outer surface of the heat storage member 3, so that the heat storage member 3 can be reliably attached to the support 2 , To ensure that the heat storage efficiently absorbs heat to the bracket 2.
  • the pressing member 5 has an inner side relatively close to the heat storage member 3 and an outer side relatively far away from the heat storage member 3.
  • the shape of the inner side of the pressing member 5 and the outer side of the heat storage member 3 can be similar, so as to ensure that the pressing member 5 can reliably act on the outer surface of the heat storage member 3 to prevent vibration or other effects during use. Force majeure causes the compression element 5 to fail to compress the heat storage element 3.
  • the pressing member 5 can be divided into two parts of the pair of buckles, and the two parts of the pair of buckles can be fixed by detachable connection.
  • the detachable connection method may be a connection method such as a bolt, a screw, etc., of course, it may also be other feasible connection methods, and the application is not specifically limited herein.
  • the pressing member 5 When the heat storage member 3 is attached and fixed to the outside of the bracket 2 by the pressing member 5, the pressing member 5 may be provided with a second opening communicating with the first opening 31 and the airflow hole. ⁇ 51.
  • the first opening 31 and the second opening 51 are distributed in the order from the inside to the outside.
  • the two sides of the mounting portion 20 are described.
  • the upper opening 420, the lower opening 430, and the passage 22 cooperate with the first opening 31 and the second opening 51 to form a heat dissipation channel 6.
  • the upper opening 420 flows out of the battery pack.
  • the second opening 51 may be directly opposite to the first opening 31.
  • the airflow hole is directly opposite to the passage 22 between the mounting portion 20, and the airflow from the outside passes through the airflow holes on the housing 4, flows through the second opening 51 and the first opening 31, and is directly guided to the passage 22
  • the corresponding central heat dissipation area then flows through the first opening 31 and the second opening 51 and flows out from the housing 4 to form a heat dissipation channel 6.
  • the heat dissipation channel 6 is a multi-channel parallel direct-blowing heat dissipation channel 6 formed by a plurality of parallel-arranged short-path flow channels, which can directly and efficiently act on each mounting portion 20 of the bracket 2 so as to be able to affect the bracket 2 And the battery core 1 located in the bracket 2 efficiently dissipates heat.
  • the pressing member 5 may not be separately provided in the battery pack.
  • the shell 4 can be used to directly abut on the heat storage element 3 so that the heat storage element 3 is attached to the outer surface of the bracket 2.
  • the heat dissipation channel 6 is mainly formed by the airflow holes on the housing 4, the first opening 31 on the heat storage element 3, and the central heat dissipation area between the mounting portion 20.
  • a battery pack which may include: at least one battery module, the battery module including: a plurality of electrically connected cells 1; a bracket 2 made of a thermally conductive material, the bracket 2 includes a plurality of mounting portions 20 and a connecting portion 24, the connecting portion 24 relatively fixedly connects the plurality of mounting portions 20 together, the mounting portion 20 is formed with a receiving cavity 21 for accommodating the battery core 1, so
  • the bracket 2 is preset with a plurality of passages 22 passing through the bracket 2, and the passages 22 extend along an axial direction perpendicular to the battery core 1;
  • the housing 4 is provided with the plurality of passages 22 connected to the housing 4 The air flow hole through.
  • the specific shape, structure, relative positional relationship, etc. of the battery cell 1, the bracket 2 made of a thermally conductive material and the outer shell 4 contained in the battery please refer to the specific description in the above embodiment. This application I won't repeat them here.
  • the passage formed in the holder 2 extends along the axial direction of the vertical battery core 1, and the passage is used to cooperate with the airflow hole on the housing 4 to form a pair of holder 2 and set in the holder 2
  • the heat dissipation channel 6 through which the battery core 1 in the bracket 2 is cooled. Since the heat dissipation channel 6 and the sealing device located at the two ends of the bracket 2 are spatially independent of each other and do not affect each other, the difficulty of setting the sealing device can be reduced, and the sealing device can reliably seal the cell 1.
  • the sealing devices are respectively arranged on both sides of the sealing end 25 of the bracket 2.
  • the sealing device includes an end cover 8 and a seal 7.
  • a pressing portion 251 may be provided at the sealed end 25.
  • the pressing portion 251 may be an annular protrusion formed on the outer surface of the sealing end 25.
  • the pressing portion 251 may also have other shapes or other arrangements, which is not specifically limited in this application.
  • a first installation groove 80 for installing the seal 7 is provided on the end cover 8.
  • the sealing element 7 is installed in the first installation groove 80 of the end cover 8, and then the end cover 8 provided with the sealing element 7 can be connected to the sealing end 25 of the bracket 2 through a connecting piece.
  • the squeezing part 251 at position 25 can contact the sealing element 7, and under the action of the squeezing force formed after the end cover 8 is matched with the bracket 2, the sealing element 7 is elastically deformed, thereby achieving sealing.
  • a second installation can be formed at the sealed end 25.
  • a groove 252, and an abutting member 26 with elastic deformation capability is arranged in the second installation groove 252.
  • one end of the abutting member 26 extends into the second installation groove 252, and the other end is in contact with the sealing member 7, and under the action of the pressing force formed after the end cover 8 is matched with the bracket 2, it seals with the The members 7 are all elastically deformed.
  • the elastic abutting member 26 can better eliminate the gap between the end cover 8 and the bracket 2.
  • the abutting member 26 can be in the form of EVA foam, O-ring, heat shrinkable tube, etc., of course, it can also be in other forms with elastic deformation capability, which is not specifically limited in this application.
  • the abutment member 26 can be used to fill the second mounting groove 252. Glue is formed.
  • the seal can also be formed by injecting glue to ensure the reliability of the sealing of the position to be sealed.
  • the flow direction of the airflow in the heat dissipation channel 6 may be parallel to the axial direction of the cell 1 as a whole.
  • the end cover 8 is provided with a third opening 81.
  • the passage 22 penetrates the bracket along the axial direction of the battery core 1.
  • the passage 22 may be located in an area surrounded by four adjacent mounting portions 20, and the passage 22 and the accommodating cavity between the mounting portions 20 are not connected, so as to ensure the airtightness of the battery 1.
  • the sealing member 7 when the end cover 8 is provided with a third opening 81, the sealing member 7 includes a third opening 81 for matching with the third opening 81 of the end cover 8 and the passage 22 of the bracket 2.
  • the first sealing portion 71 may be in the shape of a circular ring, which is arranged between the passage 22 of the bracket 2 and the third opening 81 of the end cover 8.
  • the parts 20 are sealed in the circumferential direction, and on the other hand, serve as an intermediate communication part for connecting the third opening 81 with the passage 22.
  • the inner diameter of the first sealing portion 71 may be equal to or slightly larger than the diameter of the third opening 81 and the passage 22.
  • the second sealing portion 72 may be a sealing ring with a certain wall thickness, which is arranged between the sealing end cover 8 and the sealing end 25 of the bracket 2 to achieve sealing.
  • the first sealing portion 71 and the second sealing portion 72 may be integrally formed, or may be arranged separately. Specifically, this application is not limited herein.
  • the third openings 81 are distributed at both ends of the battery core 1.
  • the lower opening 430 and the upper opening 420 cooperate with the third opening 81 and the passage 22 to form a heat dissipation channel 6. After the outside air can enter the battery pack through the lower opening 430, it flows through the third opening 81, the passage 22, and the third opening 81 in sequence, and flows out of the battery pack from the upper opening 420.
  • the heat dissipation channel 6 is also a multi-pass parallel direct-blowing heat dissipation channel formed by a plurality of parallel-arranged short-path flow channels.
  • the difference from the above-mentioned embodiment is that the flow direction of the gas in the heat dissipation channel 6 is generally parallel to the axial direction of the cell 1.
  • the heat dissipation channel 6 is a multi-channel parallel direct-blowing heat dissipation channel, and the airflow flowing through the heat dissipation channel 6 can directly and efficiently act on each mounting portion 20 of the bracket 2, so as to be able to affect the bracket 2 and the bracket 2
  • the battery cell 1 in the heat dissipation is efficient.
  • the passage 22 formed in the bracket 2 is parallel to the axial direction of the battery core 1. Therefore, the sealing device provided on the sealed end 25 of the bracket 2 not only needs to have a sealing function, but also needs to cooperate with the passage 22 and the housing 4 of the bracket 2 to form a heat dissipation channel 6.
  • a first mounting groove 80 is formed on the inner surface of the outer periphery of the end cover 8 which is matched with the bracket 2.
  • the first mounting groove 80 is used for mounting the second sealing portion 72.
  • a pressing portion 251 is provided on the outer surface of the sealing end 25 of the bracket 2 that is directly opposite to the first mounting groove 80.
  • the pressing portion 251 may be an annular protrusion formed on the outer surface of the sealing end 25.
  • the pressing portion 251 may also have other shapes or other arrangements, which is not specifically limited in this application.
  • the third opening 81 provided on the end cover 8 is directly opposite to the passage 22 of the bracket 2.
  • the end cover 8 has a third installation groove 82 formed on the inner side of the end cover 8 which is matched with the bracket 2, and the third installation groove 82 is used for installing the first sealing portion 71.
  • the outer surface of the sealing end 25 of the bracket 2 that is directly opposite to the third mounting groove 82 is also provided with a pressing portion 251.
  • the pressing portion 251 may also be an annular protrusion formed on the outer surface of the sealing end 25.
  • the first sealing portion 71 and the second sealing portion 72 are respectively installed in the third mounting groove 82 and the first mounting groove 80 of the end cover 8, and then the end cover 8 provided with the sealing element 7 can pass through
  • the connector is connected to the sealed end 25 of the bracket 2.
  • the squeezing portion 251 at the sealed end 25 can be in contact with the seal 7, and under the action of the squeezing force formed after the end cover 8 is matched with the bracket 2,
  • the seal 7 is elastically deformed, so that not only can the sealing end 25 of the bracket 2 be waterproofly sealed, but also the connectivity between the passage 22 in the bracket 2 and the airflow hole of the housing 4 can not be affected.
  • the external environment temperature is relatively high, and the power of the tool itself is large, and the heat generated is large.
  • the heat generated in the battery pack cannot Timely transmission to the outside leads to insufficient discharge capacity of the battery pack, which cannot meet the requirements of using large-function DC tools at high temperatures.
  • the battery pack provided by the present application can efficiently conduct the heat generated by the battery cell 1 during use to the outside by arranging a bracket 2 that has a high degree of adhesion to the surface of the battery cell 1 and is made of a thermally conductive material;
  • the outer side of the bracket 2 is bonded to the heat storage element 3 made of a material with high specific heat capacity.
  • the heat storage element 3 can efficiently absorb the heat in the bracket 2 so as to reliably ensure that the cell 1 and the cell are connected to each other.
  • the 1-way fit bracket 2 does not over-temperature.
  • bracket 2 the heat storage element 3 and the housing 4 of the battery pack of the present application cooperate to form a multi-path parallel direct-blowing heat dissipation channel, which can dissipate heat from the battery cell 1, thereby further controlling the battery pack and the bracket 2 The temperature of the inner surface.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biophysics (AREA)
  • Computer Hardware Design (AREA)
  • Battery Mounting, Suspending (AREA)
  • Secondary Cells (AREA)

Abstract

一种电池包，其包括：至少一个电池模组，所述电池模组包括多个电性连接的电芯（1）；由导热材料制备的支架（2），所述支架（2）包括多个安装部（20）以及连接部（24），所述连接部（24）将多个安装部（20）相对固定的连接在一起；所述安装部（20）形成有用于容纳所述电芯（1）的容纳腔（21）；所述支架（2）内部预设有贯通所述支架（2）的若干通路（22），所述若干通路（22）分布于相邻安装部（20）之间；罩设在所述支架（2）外的外壳（4），所述外壳（4）上设置有能与所述若干通路（22）相连通的气流孔。优化改进的电池包在电芯（1）放电过程中，能够提高电芯（1）的降温效率，有效降低电芯（1）以及与电芯（1）直接接触的支架（2）的温度。

Description

电池包
本申请要求了申请日为2019年8月23日，申请号为201910785506.0和申请号为201910785493.7的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及电动工具技术领域，特别涉及一种电池包。
背景技术
电池包一般是由多个电芯通过串联、并联的方式组成的电池模组。进一步的，多个电池模组也可以通过串联、并联的方式组成具有一定电压和容量的电芯组。电池包内的电芯在放电过程中会快速产生大量热量；当这些热量还未及时散发之前，就把电池包连接至充电器，此时的充电器是无法对电池包进行正常充电的，这是由于充电器通常会设置电路保护程序，只有测定电池包的温度已达到预定的低温时，充电器才会启动充电电路执行充电工作。因此，电池包如果没有较好的散热性能，在放电过过程产生的热量即不能较快地进行散发，势必在下一次充电之前需要大量的时间先进行冷却。另一种情况是，如果充电器上没有设置电路保护程序，当电池包的还未冷却即与充电器电性连接进行充电，则会损会电芯，减弱电池包的放电能力，缩短电池包的寿命，甚至会引发安全事故。
现有技术中，为了对电池包进行散热，采用的一种方式是在电池包外设置具有散热功能的电池支架，该电池支架至少部分是由一种导热材料制造，以便把电池里产生的热耗传导至电池支架，再由支架散向空气中。
虽然，该电池支架能够将电池中产生的热损耗在一定程度上向空气中排出。但是，由于放电过程产生的热量比较迅速，在没有风扇等辅助散热设备的情况下，使用过程中发现：大部分热量均停留在该电池支架上，导致电池支架上的热量无法快速向空气传导出。进一步的，由于电芯与电池支架的内侧直接接触，且电芯的温度是向外传递的，当电芯与电池支架的温 度趋于一致时，电池支架不会进一步传热，即电芯表面的温度不会进一步降低，也就无法使电芯达到理想的散热效果。
发明内容
为了克服现有技术的缺陷，本发明提供一种电池包，在电池包的电芯放电过程中，能够提高电芯的降温效率，有效降低电芯以及与电芯直接接触的支架的温度。
本发明的上述目的可采用下列技术方案来实现：
一种电池包，包括：至少一个电池模组，所述电池模组包括多个电性连接的电芯；由导热材料制备的支架，所述支架包括多个安装部以及连接部，所述连接部将多个安装部相对固定的连接在一起，所述安装部形成有用于容纳所述电芯的容纳腔，所述支架内部预设有贯通所述支架的若干通路，所述若干通路分布于相邻安装部之间；罩设在所述支架外的外壳，所述外壳上设置有能与所述若干通路相连通的气流孔。
进一步的，所述若干通路与所述容纳腔相互独立。
进一步的，所述电池包还包括至少部分贴合安装在所述支架外侧的储热件，所述储热件的比热容大于所述支架的比热容。
进一步的，所述储热件由比热容大于2.6J/(g.K)的材料制备。
进一步的，所述导热材料的导热率大于0.3W/m.k。
进一步的，所述支架在所述安装部的侧壁上设置有变形部，所述电芯的外径小于所述容纳腔的孔径，所述电芯收容于所述容纳腔后通过所述变形部的弹性变形卡紧并贴合在所述容纳腔中。
进一步的，所述变形部为所述安装部的侧壁向内形成的至少一个凸起。
进一步的，所述电芯的外径大于所述容纳腔的孔径，所述电芯通过热压涨紧的方式设置在所述安装部的容纳腔中。
进一步的，所述电芯具有相对的第一端面和第二端面以及围设在所述第一端面和第二端面的侧表面，所述侧表面与所述安装部的贴合面积至少占所述侧表面的80％。
进一步的，所述通路分布于相邻安装部的外侧壁之间，所述通路的最小间距大于1.5mm。
进一步的，所述通路沿着垂直于所述电芯的轴向上延伸。
进一步的，所述通路两侧的安装部侧壁上分别设置有散热片，所述散热片沿电芯轴向间隔地分布，所述散热片分布的长度占电芯轴向总长度的3/4。
进一步的，所述电池包还包括至少部分贴合安装在所述支架外侧的储热件所述储热件上设置有与所述通路和所述气流孔相连通的第一开孔；所述外壳包括相对的上盖和下盖，所述气流孔包括：设置在所述上盖的上开孔，设置在所述下盖的下开孔；所述通路沿着垂直于所述电芯的轴向贯通所述支架。
进一步的，所述电池包还包括压紧件，所述压紧件压合在所述储热件的外侧，用于向所述储热件施加卡紧所述支架的作用力，所述压紧件上设置有与所述第一开孔和所述气流孔相连通的第二开孔；沿着垂直于所述电芯的轴向，所述第一开孔、所述第二开孔按照从内到外的顺序分布在所述通路的两侧；所述上开孔、下开孔、所述通路与所述第一开孔、第二开孔相配合能形成散热通道。
进一步的，所述外壳包括相对的上盖和下盖，所述气流孔包括：设置在所述上盖的上开孔，设置在所述下盖的下开孔；所述支架在沿着所述电芯的轴向设置有端盖，所述端盖上设置有第三开孔，所述通路沿着所述电芯的轴向贯穿所述支架，沿着所述电芯的轴向，所述下开孔、上开孔与所述第三开孔和所述通路相配合能形成散热通道。
一种电池包，其包括：至少一个电池模组，所述电池模组包括多个电性连接的电芯；由导热材料制备的支架，所述支架包括多个安装部以及连接部，所述连接部将多个安装部相对固定的连接在一起，所述安装部形成有用于容纳所述电芯的容纳腔，所述支架预设有贯通所述支架的若干通路，所述若干通路沿着垂直于电芯的轴向延伸；外壳，所述外壳上设置有能与所述若干通路相连通的气流孔。
进一步的，所述若干通路与所述容纳腔相互独立。
本申请实施方式中所提供的电池包，通过对电池包的结构进行改进，在电池包的内部形成有独立的散热通道，能够对电池包内的支架以及与支架贴合设置的电芯进行高效的散热，使得电池包在放电结束后即刻就可以连接充电器进行充电，从而为用户节约了充电时间，同时有效地保护电芯，提升电池包的放电能力和寿命。
具体的，通过设置与电芯的表面贴合度高且由导热材料制成的支架，能够将电芯在使用过程中产生的热量通过该散热通道高效的向外传导出。
进一步的，该支架的外侧贴合由高比热容材料制备的储热件，利用该储热件能够将支架中热量高效的吸收，从而能够可靠地保证电芯以及与该电芯向贴合的支架不超温。
该改进后的电池包在使用时，能够延长电池包的工作时长，提升电池包的放电能力，特 别能适用于高温恶劣环境。
本申请的电池包的支架、储热件与外壳相配合形成有多通路并联的直吹散热通道，能够对电芯、支架进行散热，从而进一步能够控制该电池包和支架内表面的温度。
为了克服现有技术的缺陷，本发明还提供一种既具有良好的防水性能又具有良好的散热性能的电池包，能够较好地适用于高温、淋雨等恶劣的户外工作环境。
本发明的上述目的可采用下列技术方案来实现：
一种电池包，包括：至少一个电池模组，所述电池模组由多个电芯电性连接形成；支架，所述支架包括多个安装部，以及用于将所述安装部相对固定地连接在一起的连接部；所述安装部的内部形成有用于容纳所述电芯的容纳腔，所述支架内部预设有贯通所述支架的通路，所述通路分布于相邻所述安装部之间，在沿着所述电芯的轴向，所述支架具有相对的第一端和第二端，所述容纳腔具有分别位于所述第一端和第二端的开口；所述电池包还包括密封装置，用于封密所述开口，从而使位于所述容纳腔的电芯与外部相隔离。
进一步的，所述通路与所述容纳腔相互独立且与所述电芯的轴向相垂直。
进一步的，所述密封装置包括：分别位于支架第一端和第二端的密封件和端盖，所述密封件设置于所述端盖的外围内侧，当所述端盖与所述支架的一端配接时，所述端盖和支架一端形成与所述通路相隔离的密封空间。
进一步的，所述端盖设置有用于安装所述密封件的第一安装槽，所述第一端或所述第二端分别设置有挤压部，当所述端盖与所述支架的一端配接时，所述挤压部能至少部分伸入所述第一安装槽中挤压所述密封件。
进一步的，所述支架至少有一端设置有电连接片，所述支架在设置有所述电连接片的一端设置有第二安装槽，所述第二安装槽中设置有具有弹性的抵接件，所述抵接件的一端伸入所述第二安装槽中，另一端与所述密封件相接触。
进一步的，所述抵接件包括下述中的任意一种：EVA泡棉、O形圈、热缩管。
进一步的，所述抵接件通过在所述第二安装槽中注胶形成。
进一步的，所述电池包还包括罩设在所述支架外的外壳，所述外壳上设置有与所述通路相连通的气流孔，所述气流孔与所述通路相配合形成散热通道。
进一步的，所述电池包还包括：储热件，所述储热件至少部分贴合安装在所述支架外侧，所述储热件的比热容大于所述支架的比热容。
进一步的，所述安装部的外侧壁上间隔设置有第一散热片，所述第一散热片位于所述连接部之间，相邻两个所述安装部的第一散热片相面对设置，形成中心散热区。
进一步的，所述相邻连个安装部之间形成预定间隙，所述外壳包括相对的上盖和下盖，所述上盖设置有与所述预定间隙连通的上开孔，所述下盖设置有与所述预定间隙连通的下开孔；上所述储热件的侧壁上设置有与所述预定间隙和所述上开孔、下开孔相连通的第一开孔；
沿着垂直于所述电芯的轴向，所述第一开孔分布在所述中心散热区的两侧，至少所述上开孔、下开孔、所述第一开孔与所述中心散热区相配合能形成所述散热通道。
进一步的，所述电池包还包括压紧件，所述压紧件压合在所述储热件的外侧，用于向所述储热件施加卡紧所述支架的作用力，所述压紧件上设置有与所述第一开孔和所述上开孔、下开孔相连通的第二开孔；沿着垂直于所述电芯的轴向，所述第一开孔、所述第二开孔按照从内到外的顺序分布在所述中心散热区的两侧；所述上开孔、下开孔、所述中心散热区与所述第一开孔、第二开孔相配合能形成所述散热通道。
进一步的，所述通路与所述容纳腔相互独立且与所述电芯的轴向相平行，所述通路具有分别位于所述第一端和第二端的通气口，所述密封装置用于密封所述开口并将所述容纳腔与所述通路相隔离。
进一步的，所述密封装置包括：端盖、第一密封部、以及第二密封部，其中所述端盖上设置有用与所述通气口相连通的第三开口，所述第一密封部围绕所述端盖的第三开口设置，所述第二密封部设置于所述端盖外围的内侧，当所述端盖与支架的一端配接时，所述端盖的第三开口与所述通气口连通并且所述端盖与支架一端形成与所述通路相隔离的密封空间。
进一步的，还包括罩设在所述支架外的外壳，所述外壳上设置有与所述通路相连通的气流孔，所述气流孔、所述第三开孔与所述通路相配合形成散热通道。
进一步的，所述端盖的外围设置有用于安装所述第二密封部的第一安装槽，所述支架设置有与所述第一安装槽相正对的挤压部；所述端盖在所述第三开孔的外侧还设置有第三安装槽，所述第三安装槽用于安装所述第一密封部。
本申请实施方式中所提供的电池包，通过对电池包的结构进行改进，其用于安装电芯的支架内部预设有贯通所述支架的通路，该通路与外部相连通，在不影响电池包整体密封性能的前提下，能够对电池包内的支架以及与支架贴合设置的电芯进行高效的散热；此外，该电池包还设置有密封装置，用于密封支架两端的开口，从而使得位于该支架中的电芯与外部相隔离，整体上该电池包有良好的防水性能又具有良好的散热性能，能够较好地适用于高温、淋雨等恶劣的户外工作环境。
附图说明
下面结合附图和实施方式对本发明对进一步说明。
图1是本申请一个实施方式中提供的电池包的结构示意图；
图2是图1中提供的电池包的A-A剖视图；
图3是图1中提供的电池包的爆照图；
图4是图1中提供的电池包中电池组件的爆炸图；
图5是图1中提供的电池包中电池组件的主视图；
图6是本申请实施方式中提供的支架上散热片的分布示意图；
图7是图1中电池包中支架与密封件、端盖配合位置的结构示意图；
图8是图7中M处的局部放大图；
图9是图7中N处的局部放大图；
图10是本申请一个实施方式中提供的电池包的结构示意图；
图11是图10中提供的电池包的B-B剖视图；
图12是图10中提供的电池包的爆炸图；
图13是图10中电池包的电池组件的爆炸图；
图14是图13中电池包的支架的结构示意图；
图15是图14中支架的主视图；
图16是图10中电池包中支架与密封件、端盖配合位置的结构示意图；
图17是图16中H处的局部放大图。
附图标记说明：
100、电池组件；
1、电芯；11、导电片；12、供电板；
2、支架；20、安装部；21、容纳腔；22、通路；23、变形部；24、连接部；241、散热片；25、密封端；251、挤压部；252、第二安装槽；26、抵接件；
3、储热件；31、第一开孔；
4、外壳；42、上盖；420、上开孔；43、下盖；430、下开孔；44、第一侧板；45、第 二侧板；46、第一侧盖；47、第二侧盖；
5、压紧件；51、第二开孔；
6、散热通道；
7、密封件；71、第一密封部；72、第二密封部；
8、端盖；80、第一安装槽；81、第三开孔；82、第三安装槽。
具体实施方式
下面将结合附图和具体实施例，对本发明的技术方案作详细说明，应理解这些实施例仅用于说明本发明而不用于限制本发明的范围，在阅读了本发明之后，本领域技术人员对本发明的各种等价形式的修改均落入本申请所附权利要求所限定的范围内。
需要说明的是，当元件被称为“设置于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。本文所使用的术语“垂直的”、“水平的”、“上”、“下”、“左”、“右”以及类似的表述只是为了说明的目的，并不表示是唯一的实施方式。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的实施方式的目的，不是旨在于限制本申请。本文所使用的术语“和/或”包括一个或多个相关的所列项目的任意的和所有的组合。
本申请说明书中提供了一种改进后的电池包，相对于现有技术而言，在电池包的电芯放电过程中，能够提高电芯的降温效率，有效降低电芯以及与电芯直接接触的支架的温度，提升电池包的放电能力。
请综合参阅图1至图12，本申请说明书实施方式中提供了一种电池包，该电池包主要包括：电芯1、支架2、外壳4、密封装置以及一些用于配合安装的组件等。其中，如图4或图10所示，至少电芯1、支架2和密封装置等可以形成安装在外壳4中的电池组件100。
在本说明书中，该电芯1的个数以及电芯1之间的串并联方式可以根据该电芯1本身的电压以及不同的标称电压进行调整，本申请在此并不作具体的限定。具体的，该电芯1可以通过导电片11串联，或者并联，或者串联和并联相结合的方式形成电池模组。该电池模组 的个数可以为一个也可以为两个及以上。
请结合参阅图2，在一个实施方式中，电池模组可以有两个(左右各一个)。其中，一个电池模组有8节电芯(如图4所示)，另一个电池模组有7节电芯。进一步的，两个电池模组通过供电板12相串联，输出60V电压。
请结合参阅图9，在另一个实施方式中，该电池模组的个数也为两个。其中，两个电池模组可以通过供电板12相并联。每个电池模组中可以包含15节4伏特电芯1，15节电芯1串联形成的标称电压为60伏特的电芯1组。然后两个电池模组再并联，故输出的仍然是60V电压，但电流是15节电芯串联时的2倍。
具体的，该外壳4可以包括上盖42、下盖43、以及设置在上盖42和下盖43之间的第一侧板44、第二侧板45、第一侧盖46和第二侧盖47。其中，所述第一侧板44和第二侧板45相对设置，所述第一侧盖46和第二侧盖47相对设置。
该外壳4上设置有气流孔，该气流孔用于将外界的空气导入和导出电池包。具体的，该气流孔可以包括设置在上盖42上的上开孔420和设置在下盖43上的下开孔430。使用时，该外壳4的气流孔与电池包中的其他结构配合后形成散热通道6，对电芯1、支架2进行冷却。
该电芯1具有相对的第一端面和第二端面以及围设在所述第一端面和第二端面的侧表面。该电芯1的形状可以为圆柱型，当然，该电芯1的形状还可以根据实际需要做适应性调节，例如可以为长方体，或者近似长方体，甚至是其他异型构造。对于该电芯1的形状、构造本申请在此并不作具体的限定。在本说明书中，主要以电芯1为圆柱型进行举例说明，其他电芯的形状可以类比参照本申请。
现有技术中，一般的电芯1表面设置有表皮，该表皮一般采用导热性能不良的绝缘材料(例如，塑料)制备。进一步的，在电芯1设置有表皮的情况下，由于表皮通过包裹的方式套设在电芯1的外表面，因此该表皮也无法与电芯1完全贴合设置。这就导致表皮与电芯1之间容易形成至少部分空气段。该空气段以及导热性能不良的表皮都会影响电芯1向外传导热量。
在本说明书中，为了将电芯1中的热量尽可能高效地向外传导出去，对该电芯1的外表面进行去皮处理，即不再设置表皮。后续直接将去皮处理后的电芯1贴合安装在该支架2中，以提高热传导效率。
在本说明书中，该支架2主要用于安装电芯1。该支架2由导热材料制备，其能够将电芯1上的热量及时向外传导出。具体的，为了保证该支架2具有良好的导热性能，所述导热材料的导热率大于0.3W/m.k。
为了提高支架2结构的稳定性并降低安装的难度，该支架2可以为整体式支架，该整体式支架可以一体成型，也可以设置成分体，再通过组装连接在一起。当然，在本说明书中也不排除将该支架2设置为分体结构的形式。该支架2的比热容范围大于1.8J/(g.K)，以保证该支架2能将电芯1中的热量以较高的效率吸收，结合其高导热的性能，能将吸收的热量向外快速传导出。具体的，该支架2的材料可以选用聚丙烯(PP)、高密度聚乙烯(HDPE)、低密度聚乙烯(LDPE)等。
在本说明书中，该支架2可以包括多个安装部20，该安装部20的内部形成有用于容纳所述电芯1的容纳腔21。具体的，该安装部20的个数可以与电芯1的个数相同，也可以大于该电芯1的个数。所述电芯1至少部分贴合安装在所述容纳腔21中。
在本说明书中，主要以整体式支架2为例进行举例说明，其他形式的支架2可以进行类比参照。该整体式支架2具有多个安装部20，所述支架2中的安装部20可以按照预定的排列顺序排布。例如，多个安装部20可以在第一方向上间隔一定距离进行排布，形成一排安装部20；在垂直于所述第一方向的第二方向上，多排安装部20间隔一定距离进行排布，形成安装部20阵列。当然，该安装部20还可以根据实际的使用需要，按照其他顺序进行排布，本申请在此并不作唯一的限定。
所述支架2内部预设有若干贯通所述支架2的若干通路22，所述若干通路22分布于相邻安装部20之间。其中，该支架2内部是指电池模组中最外侧的电芯1的中心连线所围成的区域。该通路22与所述容纳腔21相互独立。当该用于流通气流进行散热的通路22与用于容纳电芯1的容纳腔21相互独立，不连通后，该电芯1可以利用导热支架2本身传导热量，导热率高。
相对于通路22与所述容纳腔21不相互独立，即气流通路22与容纳腔21连通的情况，由于气流通路22与容纳腔21连通主要利用空气导热，而空气的导热率并没有导热支架2的导热率高，导热效果较差。此外，当该通路22与所述容纳腔21相互独立后，也有利于后续防水密封结构的设置，相对于通路22与所述容纳腔21不相互独立的情况，不容易与防水密封结构发生干涉。
具体的，该安装部20可以为具有一定壁厚的腔体。该腔体的中空部分为所述容纳腔21。该安装部20包括侧壁、定位口以及与该定位口相对的安装口。
在一个实施方式中，所述电芯1的外径大于所述容纳腔21的孔径，所述电芯1可以通过热压涨紧的方式设置在所述安装部20的容纳腔21中。
当该电芯1通过热压涨紧的方式设置在容纳腔21中时，所述电芯1的外径大于所述容纳腔21的孔径，支架2中容纳腔21的初始表面积小于电芯1的外表面积，在电芯1通过热 压涨紧的方式安装进容纳腔21后，该电芯1的外侧面可以直接与安装部20内的侧壁完全贴合，贴合面积占侧面积的百分比(即贴合度)能够接近100％。
在另一个实施方式中，所述支架2在所述安装部20的侧壁上设置有变形部23，所述电芯1的外径小于所述容纳腔21的孔径，所述电芯1通过设置有所述变形部23的安装部20发生弹性变形后卡紧在所述容纳腔21中。
具体的，该变形部23可以为所述安装部20的侧壁向内形成的至少一个凸起。当该电芯1通过安装部20侧壁上的变形部23发生弹性变形后，被卡紧在所述容纳腔21中时，支架2中容纳腔21的初始表面积大于电芯1的外表面积，在电芯1通过挤压该变形部23安装进容纳腔21后，该电芯1的外侧面可以大部分直接与安装部20内的侧壁贴合，贴合度在80％以上。
如图5所示，以该凸起的个数为一个或两个进行举例说明。该凸起可以设置在相对靠近安装口的一侧。当电芯1从该安装口装入时，该凸起会发生弹性变形，使得在该电芯1装入的同时能将该电芯1卡紧在该安装部20中，以保证该电芯1的外侧面与安装部20的容纳腔21相贴合。此外，在使用过程中，即使该电池包发生振动，通过该凸起的弹性变形，也能够将每个电芯1紧密地贴合在安装部20的容纳腔21中。
此外，该变形部23也可以为所述安装部20的侧壁上设置的开口。通过设置该开口可以使得该安装部发生形变，从而能与电芯1较好地贴合。当然，该变形部23的形式并不限于上述举例。
整体上，无论采用哪种安装方式，需要保证每个电芯1的侧表面与安装部20的贴合面积至少占所述侧表面的80％，进而能够保证该电芯1在工作中产生的热量能够快速地传导给支架2。
在本说明书中，该电池包还可以包括至少部分贴合安装在所述支架2外侧的储热件3。储热件3可以采用吸热能力强的大比热容材料制成。具体的，所述储热件3的比热容大于所述支架2的比热容，并且所述储热件3至少部分贴合安装在所述支架2外侧，使其能够将支架2中的热量高效地进行吸收，从而保证支架2以及与支架2贴合安装的电芯1的温度不超温。当电池包置于充电器上时，聚集于储热件3的大量热量可以通过启动充电器的风扇进行冷却。
具体的，所述储热件3由比热容大于2.6J/(g.K)的高比热容储热材料制备。该高比热容材料采用非相变材料，例如，可以为下述中的任意一种：高分子材料、高导热材料、硅胶；当然该高比热容材料也可以采用相变材料。当该储热件3为非相变的高比热容材料时，其可以 在吸热的过程中，以稳定的比热容参数进行吸热，并且在吸热过程中，不会发生相变。当该储热件3在吸热过程中不发生相变时，不仅能够维持高的吸热效率，而且有利于简化电池包的整体结构。当采用相变材料为储热件3的主体材料时，由于其在使用过程中会发生状态的变化，例如，会由固态进入熔融状态，因此，在结构上需要设置容纳该相变材料的容纳腔，或者对该相变材料进行密封处理。
在本申请说明书中，所述支架2中相邻两个所述安装部20之间设置有连接部24。具体的，所述连接部24与所述密封端25一体成型。所述连接部24位于靠近所述安装部20的端部。多个所述安装部20的端部形成所述支架2的两端。
为了保证该电池包中电芯1的防水密封性能，支架2的两端设置有密封装置。具体的，多个所述安装部20的端部形成所述支架2的两端(即密封端25)。该密封装置包括密封件7和端盖8。所述密封件7设置在所述密封端25与端盖8之间，对电芯1实现可靠地密封。该密封件7的形状构造主要基于该端盖8与密封端25相配合后形成的容纳空间的形状及其所要密封的位置而确定。该密封端25可以为支架2端部的环状凸起，该凸起可以与该支架2一体成型，或者该凸起可以通过可拆卸连接的方式固定在该支架2的端部。如图4所示，当该端盖8上没有设置开孔时，该密封件7可以为具有一定壁厚的密封圈的形式。如图13所示，当该端盖8上设置有开孔时，该密封件7可以为设置有开孔的密封片的形式。
该电池包中形成有散热通道6，请结合参阅图1至图6，在一些实施方式中，气流在该散热通道6中的流动方向可以整体与电芯1的轴向相垂直。在本实施方式中，相邻两个所述安装部20外面壁之间间隔预定间隙形成通路22。该通路22沿着垂直于所述电芯1的轴向上延伸，所述储热件3的侧壁上设置有与所述预定通路22和所述气流孔相连通的第一开孔31。
该储热件3可以包括第一部分和第二部分，该第一部分和第二部分可以通过可拆卸连接方式，或者其他限位方式贴合固定在该支架2的外侧。其中，该第一部分和第二部分的内表面可以与所述支架2的外侧面相匹配。该第一部分和第二部分上设置有与所述通路22相连通的第一开孔31。
该通路22用于和电池包中的储热件3的第一开孔31以及外壳4的气流孔等相配合，从 而用于形成散热通道6。所述连接部24位于靠近所述电芯1的端面处。电芯1在沿着轴向上，除了连接部24位置外，在位于端部的两个连接部24之间的通路22均可以为用于流通气流。当该电池包的电芯1之间形成有较长长度的通路22后，有利于保证该电池包在使用时具有较佳的散热效果。
在本实施方式中，所述通路分布于相邻安装部的外侧壁之间，为了满足散热需求，所述通路的最小间距大于1.5mm。
如图6所示，进一步的，为了保证散热通道对支架2产生良好的散热效果，位于所述连接部24之间的所述安装部20的侧壁上分别设置有散热片241。所述散热片沿着电芯1轴向间隔地分布。相邻两个所述安装部20的散热片241相面对设置，形成中心散热区。该散热片241主要用于将电芯1传导给支架2的热量通过散热通道6快速的向外传递出。为了尽可能提高该散热片241的散热效果，所述散热片241分布的长度占电芯1轴向总长度的3/4。
进一步的，考虑到该通路22所在的空间内设置有所述散热片241，为了保证该散热片241所在的中心散热区在流通气流时对支架2具有较佳的降温效果，两个安装部20外侧壁之间的距离不能过小，一般不小于5毫米。考虑到该电池包的整体尺寸不能过大，特别是受到安装空间的限制，该电池包的外壳尺寸不能过大，一般的，两个安装部20外侧壁之间的距离不能过大，一般不能大于15毫米。整体上，在设置散热片241的前提下，所述通路22沿着垂直于所述电芯1的轴向上的距离在5毫米至15毫米之间。
如图4所示，在一些实施方式中，该电池包还可以设置有压紧件5。该压紧件5压合在所述储热件3的外侧，用于向所述储热件3施加卡紧所述支架2的作用力。
在本实施方式中，所述压紧件5可以由刚性材料制作，该压紧件5可以贴合在该储热件3的外表面，从而可以将储热件3可靠地与支架2贴合，保证该储热高效地对支架2进行吸热。具体的，该压紧件5具有相对的靠近所述储热件3的内侧和相对远离所述储热件3的外侧。其中，该压紧件5的内侧与该储热件3外侧的形状可以相似，从而保证压紧件5能够可靠地作用在该储热件3的外表面，防止在使用过程中因震动或其他不可抗因素，导致压紧件5对储热件3压紧失效。
具体的，该压紧件5可以分为对扣的两部分，该对扣的两部分可以通过可拆卸连接的方式相固定。该可拆卸连接的方式可以为螺栓、螺钉等连接方式，当然也可以为其他可行的连接方式，本申请在此并不作具体的限定。
当该储热件3通过压紧件5贴合固定在支架2外时，该所述压紧件5上可以设置有与所述第一开孔31和所述气流孔相连通的第二开孔51。
如图2和图4所示，具体的，沿着垂直于所述电芯1的轴向，所述第一开孔31、所述第二开孔51按照从内到外的顺序分布在所述安装部20的两侧。所述上开孔420、下开孔430、所述通路22与所述第一开孔31、第二开孔51相配合能形成散热通道6。外界空气能通过所述下开孔430进入所述电池包后，依次流经所述第二开孔51、第一开孔31、通路22、第一开孔31、第二开孔51，从所述上开孔420流出所述电池包。
该第二开孔51可以与该第一开孔31相正对。该气流孔与安装部20之间的通路22相正对，外界的气流通过外壳4上的气流孔，流经所述第二开孔51、第一开孔31后，直接导向所述通路22所对应的中心散热区，然后流经第一开孔31、第二开孔51从外壳4向外流出，形成散热通道6。整体上，该散热通道6为由多股并行排列的短路径流道形成的多通路并联的直吹散热通道6，能够直接高效的作用在支架2的每个安装部20上，从而能够对支架2以及位于支架2中的电芯1高效的散热。
在一些实施方式中，该电池包中可以不单独设置压紧件5。可以利用该外壳4直接抵靠在储热件3上，从而将储热件3贴合在支架2的外表面上。此外，该散热通道6主要由外壳4上的气流孔、储热件3上的第一开孔31以及安装部20之间的中心散热区配合形成。
在本说明书中，还提供一种电池包，其可以包括：至少一个电池模组，所述电池模组包括：多个电性连接的电芯1；由导热材料制备的支架2，所述支架2包括多个安装部20以及连接部24，所述连接部24将多个安装部20相对固定的连接在一起，所述安装部20形成有用于容纳所述电芯1的容纳腔21，所述支架2预设有若干贯通所述支架2的通路22，所述通路22沿着垂直于电芯1的轴向延伸；外壳4，所述外壳4上设置有能与所述若干通路22相连通的气流孔。
在本实施方式中，该电池中所包含的电芯1、采用由导热材料制备的支架2以及该外壳4 的具体形状、结构、相对位置关系等请参照上述实施方式中的具体描述，本申请在此不再赘述。
本实施方式中所提供的电池包，其支架2中形成的通路沿着垂直电芯1的轴向延伸，该通路用于和外壳4上的气流孔相配合能够形成对支架2以及设置在该支架2内的电芯1进行冷却的散热通道6。由于该散热通道6与位于该支架2两端的密封装置在空间上相互独立分布，互不影响，因此能够降低密封装置的设置难度，且保证该密封装置能对电芯1进行可靠密封。
如图7所示，该密封装置分别设置在该支架2的密封端25的两侧。该密封装置包括端盖8和密封件7。其中，如图8所示，当支架2的一侧无需引出导电片11时，可以在密封端25处设置有挤压部251。具体的，该挤压部251可以为在密封端25的外表面形成的环形凸起，当然该挤压部251还可以为其他形状或者其他设置方式，本申请在此并不作具体的限定。在端盖8上设置有用于安装所述密封件7的第一安装槽80。组装时，将密封件7安装在该端盖8的第一安装槽80中，然后将该设置有密封件7的端盖8可以通过连接件连接在支架2的密封端25处，该密封端25处的挤压部251能与该密封件7相接触，并在端盖8与支架2配合后形成的挤压力作用下，使该密封件7发生弹性变形，从而实现密封。
如图9所示，当支架2的另一侧需要将导电片11引出端盖时，为了使导电片11伸出的位置处密封性更好，可以在该密封端25处形成一个第二安装槽252，并且在该第二安装槽252内设置一个具有弹性变形能力的抵接件26。具体的，该抵接件26的一端伸入该第二安装槽252内，另一端与密封件7相接触，并且在端盖8与支架2配合后形成的挤压力作用下，与该密封件7均发生弹性变形，相对于非变形或刚性的抵接件而言，具有弹性的抵接件26能更好的消除端盖8与支架2之间的间隙。具体的，该抵接件26可以采用EVA泡棉、O形圈、热缩管等形式，当然，其也可以为其他具有弹性形变能力的形式，本申请在此并不作具体的限定。
此外，为了保证配合位置的密封性，例如为了较佳地保证该导电片11伸出位置处的密封性，实现防水功能，所述抵接件26可以采用在所述第二安装槽252中注胶形成。此外，在其他配合位置，也可以通过注胶的方式形成密封件，以保证待密封位置密封的可靠性。
如图10至图15所示，在另一些实施方式中，气流在该散热通道6中的流动方向可以整体 与电芯1的轴向相平行。所述端盖8上设置有第三开孔81。具体的，如图14和图15所示，该通路22沿着所述电芯1的轴向贯穿所述支架。具体的，该通路22可以位于四个相邻的安装部20围设的区域中，该通路22与该安装部20之间的容纳腔不连通，从而保证电芯1的密封性。
如图13所示，当该端盖8设置有第三开孔81时，所述密封件7包括用于和所述端盖8的第三开孔81、支架2的通路22相匹配的第一密封部71，以及与所述端盖8和所述支架2的密封端25相匹配的第二密封部72。
具体的，该第一密封部71可以为圆环状，其设置在所述支架2的通路22与端盖8的第三开孔81之间，一方面用于对支架2的通路22与安装部20之间进行周向密封，另一方面作为中间连通部用于将第三开孔81与通路22相连通。该第一密封部71的内径可以等于或略大于所述第三开孔81和通路22的孔径。该第二密封部72可以为具有一定壁厚的密封圈，设置在密封端盖8与支架2的密封端25之间，实现密封。该第一密封部71和第二密封部72可以为一体成型，也可以为分体设置的形式，具体的，本申请在此不作限定。
沿着所述电芯1的轴向，所述第三开孔81分布在所述电芯1的两端。所述下开孔430、上开孔420与所述第三开孔81和通路22相配合能形成散热通道6。外界空气能通过所述下开孔430进入所述电池包后，依次流经所述第三开孔81、通路22、第三开孔81，从所述上开孔420流出所述电池包。
在本实施方式中，该散热通道6也为由多股并行排列的短路径流道形成的多通路并联的直吹散热通道。与上述实施方式不同之处在于：所述散热通道6中气体的流向整体与电芯1的轴线方向相平行。整体上，该散热通道6为多通路并联的直吹散热通道，流经该散热通道6的气流能够直接高效的作用在支架2的每个安装部20上，从而能够对支架2以及位于支架2中的电芯1高效的散热。
请结合参阅图16和图17，该支架2中形成的通路22与电芯1的轴向相平行。因此，该支架2的密封端25设置的密封装置不仅需要具有密封的功能，而且还需要与支架2的通路22、外壳4相配合，形成散热通道6。
具体的，该端盖8的外围与支架2配合的内表面形成有第一安装槽80.该第一安装槽80用于 安装第二密封部72。该支架2的密封端25与第一安装槽80相正对的外表面设置有挤压部251。具体的，该挤压部251可以为在密封端25的外表面形成的环形凸起，当然该挤压部251还可以为其他形状或者其他设置方式，本申请在此并不作具体的限定。
此外，该端盖8上设置的第三开孔81与支架2的通路22相正对。该端盖8在与支架2配合的内侧形成有第三安装槽82，该第三安装槽82用于安装第一密封部71。相应的，该支架2的密封端25与该第三安装槽82相正对的外表面也设置有挤压部251。具体的，该挤压部251也可以为在密封端25的外表面形成的环形凸起。
组装时，将第一密封部71、第二密封部72分别安装在该端盖8的第三安装槽82、第一安装槽80中，然后将该设置有密封件7的端盖8可以通过连接件连接在支架2的密封端25处，该密封端25处的挤压部251能与该密封件7相接触，并在端盖8与支架2配合后形成的挤压力作用下，使该密封件7发生弹性变形，从而不仅能够对支架2的密封端25实现防水密封，并且能够不影响支架2中通路22与外壳4的气流孔之间的连通性。
在一个具体的使用场景下，例如，对于在高温环境下，大功率直流工具而言，外界环境温度较高，再加上本身工具功率大，发热量大，此时电池包中产生的热量无法及时向外传递，导致电池包放电能力不足，无法满足高温下，大功能直流工具的使用需求。
而本申请所提供的电池包，通过设置与电芯1的表面贴合度高且由导热材料制成的支架2，能够将电芯1在使用过程中产生的热量高效的向外传导出；进一步的，该支架2的外侧贴合后由高比热容材料制备的储热件3，利用该储热件3能够将支架2中热量高效的吸收，从而能够可靠地保证电芯1以及与该电芯1向贴合的支架2不超温。该改进后的电池包在使用时，能够延长电池包的工作时长，提升电池包的放电能力。
进一步的，本申请的电池包的支架2、储热件3与外壳4相配合形成有多通路并联的直吹散热通道，能够对电芯1进行散热，从而进一步能够控制该电池包和支架2内表面的温度。
需要说明的是，在本申请的描述中，术语“第一”、“第二”等仅用于描述目的和区别类似的对象，两者之间并不存在先后顺序，也不能理解为指示或暗示相对重要性。此外，在本申请的描述中，除非另有说明，“多个”的含义是两个或两个以上。
本说明书中的上述各个实施方式均采用递进的方式描述，各个实施方式之间相同相似部分相互参照即可，每个实施方式重点说明的都是与其他实施方式不同之处。
以上所述仅为本发明的几个实施方式，虽然本发明所揭露的实施方式如上，但所述内容只是为了便于理解本发明而采用的实施方式，并非用于限定本发明。任何本发明所属技术领域的技术人员，在不脱离本发明所揭露的精神和范围的前提下，可以在实施方式的形式上及细节上作任何的修改与变化，但本发明的专利保护范围，仍须以所附权利要求书所界定的范围为准。

Claims (17)

  1. 一种电池包，其特征在于，其包括：
    至少一个电池模组，所述电池模组包括多个电性连接的电芯；
    由导热材料制备的支架，所述支架包括多个安装部以及连接部，所述连接部将多个安装部相对固定的连接在一起，所述安装部形成有用于容纳所述电芯的容纳腔，所述支架内部预设有贯通所述支架的若干通路，所述若干通路分布于相邻安装部之间；
    罩设在所述支架外的外壳，所述外壳上设置有能与所述若干通路相连通的气流孔。
  2. 如权利要求1所述的电池包，其特征在于，所述若干通路与所述容纳腔相互独立。
  3. 如权利要求1所述的电池包，其特征在于，还包括至少部分贴合安装在所述支架外侧的储热件，所述储热件的比热容大于所述支架的比热容。
  4. 如权利要求3所述的电池包，其特征在于，所述储热件由比热容大于2.6J/(g.K)的材料制备。
  5. 如权利要求1所述的电池包，其特征在于，所述导热材料的导热率大于0.3W/m.k。
  6. 如权利要求1所述的电池包，其特征在于，所述支架在所述安装部的侧壁上设置有变形部，所述电芯的外径小于所述容纳腔的孔径，所述电芯收容于所述容纳腔后通过所述变形部的弹性变形卡紧并贴合在所述容纳腔中。
  7. 如权利要求6所述的电池包，其特征在于，所述变形部为所述安装部的侧壁向内形成的至少一个凸起。
  8. 如权利要求1所述的电池包，其特征在于，所述电芯的外径大于所述容纳腔的孔径，所述电芯通过热压涨紧的方式设置在所述安装部的容纳腔中。
  9. 如权利要求6或8所述的电池包，其特征在于，所述电芯具有相对的第一端面和第二端面以及围设在所述第一端面和第二端面的侧表面，所述侧表面与所述安装部的贴合面积至少占所述侧表面的80％。
  10. 如权利要求1所述的电池包，其特征在于，所述通路分布于相邻安装部的外侧壁之间，所述通路的最小间距大于1.5mm。
  11. 如权利要求1所述的电池包，其特征在于：所述通路沿着垂直于所述电芯的轴向上延伸。
  12. 如权利要求11所述的电池包，其特征在于：所述通路两侧的安装部侧壁上分别设置有散热片，所述散热片沿电芯轴向间隔地分布，所述散热片分布的长度占电芯轴向总长度的3/4。
  13. 如权利要求11所述的电池包，其特征在于：还包括至少部分贴合安装在所述支架外侧的储热件，所述储热件上设置有与所述通路和所述气流孔相连通的第一开孔；所述外壳包括相对的上盖和下盖，所述气流孔包括：设置在所述上盖的上开孔，设置在所述下盖的下开孔；所述通路沿着垂直于所述电芯的轴向贯通所述支架。
  14. 如权利要求13所述的电池包，其特征在于，还包括压紧件，所述压紧件压合在所述储热件的外侧，用于向所述储热件施加卡紧所述支架的作用力，所述压紧件上设置有与所述第一开孔和所述气流孔相连通的第二开孔；
    沿着垂直于所述电芯的轴向，所述第一开孔、所述第二开孔按照从内到外的顺序分布在所述通路的两侧；所述上开孔、下开孔、所述通路与所述第一开孔、第二开孔相配合能形成散热通道。
  15. 如权利要求1所述的电池包，其特征在于，所述外壳包括相对的上盖和下盖，所述气流孔包括：设置在所述上盖的上开孔，设置在所述下盖的下开孔；所述支架在沿着所述电芯的轴向设置有端盖，所述端盖上设置有第三开孔，所述通路沿着所述电芯的轴向贯穿所述支架，沿着所述电芯的轴向，所述下开孔、上开孔与所述第三开孔和所述通路相配合能形成散热通道。
  16. 一种电池包，其特征在于，其包括：
    至少一个电池模组，所述电池模组包括多个电性连接的电芯；
    由导热材料制备的支架，所述支架包括多个安装部以及连接部，所述连接部将多个安装部相对固定的连接在一起，所述安装部形成有用于容纳所述电芯的容纳腔，所述支架预设有贯通所述支架的若干通路，所述若干通路沿着垂直于电芯的轴向延伸；
    外壳，所述外壳上设置有能与所述若干通路相连通的气流孔。
  17. 如权利要求16所述的电池包，其特征在于，所述若干通路与所述容纳腔相互独立。
PCT/CN2019/120077 2019-08-23 2019-11-22 电池包 WO2021036030A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19943824.3A EP4020680A4 (en) 2019-08-23 2019-11-22 BATTERY PACK
US17/678,509 US20220181718A1 (en) 2019-08-23 2022-02-23 Battery pack

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201910785493.7A CN112490560A (zh) 2019-08-23 2019-08-23 电池包
CN201910785506.0 2019-08-23
CN201910785493.7 2019-08-23
CN201910785506.0A CN112490561A (zh) 2019-08-23 2019-08-23 电池包

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US17/678,509 Continuation US20220181718A1 (en) 2019-08-23 2022-02-23 Battery pack

Publications (1)

Publication Number Publication Date
WO2021036030A1 true WO2021036030A1 (zh) 2021-03-04

Family

ID=74684492

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/120077 WO2021036030A1 (zh) 2019-08-23 2019-11-22 电池包

Country Status (3)

Country Link
US (1) US20220181718A1 (zh)
EP (1) EP4020680A4 (zh)
WO (1) WO2021036030A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114566735A (zh) * 2022-03-02 2022-05-31 深圳市华宝新能源股份有限公司 一种散热结构及储能电源

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010198937A (ja) * 2009-02-26 2010-09-09 Toyota Motor Corp 蓄電装置
CN203967155U (zh) * 2014-07-01 2014-11-26 广东亿纬赛恩斯新能源系统有限公司 电池模组的成组结构
CN206134753U (zh) * 2016-09-09 2017-04-26 珠海格力电器股份有限公司 电池箱
CN106816670A (zh) * 2017-04-14 2017-06-09 华霆（合肥）动力技术有限公司 导热装置及电源装置
CN107946513A (zh) * 2017-11-24 2018-04-20 上海捷科工具有限公司 一种单排电池包
CN210224125U (zh) * 2019-08-23 2020-03-31 苏州宝时得电动工具有限公司 电池包
CN210325922U (zh) * 2019-08-23 2020-04-14 苏州宝时得电动工具有限公司 电池包

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5049436B2 (ja) * 2001-09-28 2012-10-17 パナソニック株式会社 組電池
DE102007050506A1 (de) * 2007-10-19 2009-04-23 Behr Gmbh & Co. Kg Vorrichtung zur elektrischen Energiespeicherung
US20170301964A1 (en) * 2014-10-29 2017-10-19 Sanyo Electric Co., Ltd. Battery pack and heat dissipating holder
KR102003679B1 (ko) * 2017-03-03 2019-10-02 한국에너지기술연구원 배터리 팩킹모듈

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010198937A (ja) * 2009-02-26 2010-09-09 Toyota Motor Corp 蓄電装置
CN203967155U (zh) * 2014-07-01 2014-11-26 广东亿纬赛恩斯新能源系统有限公司 电池模组的成组结构
CN206134753U (zh) * 2016-09-09 2017-04-26 珠海格力电器股份有限公司 电池箱
CN106816670A (zh) * 2017-04-14 2017-06-09 华霆（合肥）动力技术有限公司 导热装置及电源装置
CN107946513A (zh) * 2017-11-24 2018-04-20 上海捷科工具有限公司 一种单排电池包
CN210224125U (zh) * 2019-08-23 2020-03-31 苏州宝时得电动工具有限公司 电池包
CN210325922U (zh) * 2019-08-23 2020-04-14 苏州宝时得电动工具有限公司 电池包

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4020680A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114566735A (zh) * 2022-03-02 2022-05-31 深圳市华宝新能源股份有限公司 一种散热结构及储能电源

Also Published As

Publication number Publication date
US20220181718A1 (en) 2022-06-09
EP4020680A1 (en) 2022-06-29
EP4020680A4 (en) 2024-07-31

Similar Documents

Publication Publication Date Title
US11600871B2 (en) Battery pack
KR20200078450A (ko) 배터리 모듈 및 이의 제조 방법
US20110097617A1 (en) Battery Set with Heat Conducting Jelly
CN107437594B (zh) 电池包
CN106935927A (zh) 电池模块和包括其的车辆
US20240128542A1 (en) Battery pack
KR20070014658A (ko) 이차 전지 모듈
CN210325922U (zh) 电池包
CN210224125U (zh) 电池包
WO2021036030A1 (zh) 电池包
CN112490560A (zh) 电池包
US20240063469A1 (en) Battery pack and electrical device
WO2021039957A1 (ja) 蓄電モジュール
WO2024037655A1 (zh) 电池模组上盖结构、电池模组及电池包
CN210156460U (zh) 一种电池包及软包电芯模组
CN219476787U (zh) 一种电池热管理装置
CN112490561A (zh) 电池包
CN115882105A (zh) 电池包及用电设备
CN209963157U (zh) 动力电池总成及车辆
CN216761467U (zh) 散热组件及充电装置
CN216213787U (zh) 电池壳体、电池组件以及无人机
CN211088350U (zh) 一种圆柱电芯的散热支架及锂离子电池模组
CN220895678U (zh) 壳体组件和储能电源
CN217788543U (zh) 储能装置和具有其的储能装置控制系统
CN219626736U (zh) 一种电池

Legal Events

Date Code Title Description
NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2019943824

Country of ref document: EP

Effective date: 20220323