CN210325922U - Battery pack - Google Patents

Abstract

The utility model discloses a battery pack, it includes: the battery module comprises a plurality of electric cores which are electrically connected; the bracket is made of heat conducting materials and comprises a plurality of mounting parts and a connecting part, and the connecting part is used for fixedly connecting the mounting parts together; the mounting part is provided with an accommodating cavity for accommodating the battery core; a plurality of passages penetrating through the bracket are preset in the bracket and distributed between the adjacent mounting parts; and the shell is covered outside the bracket, and the shell is provided with airflow holes which can be communicated with the plurality of passages. The utility model discloses the institute has made optimization improvement to the battery package, and at the electric core discharge process of battery package, can improve the cooling efficiency of electric core, effectively reduce electric core and with the temperature of electric core direct contact's support.

Description

Battery pack

Technical Field

The utility model relates to an electric tool technical field, in particular to battery pack.

Background

The battery pack is generally a battery module formed by connecting a plurality of battery cells in series or in parallel. Furthermore, a plurality of battery modules can also form a battery core group with certain voltage and capacity in a series connection and parallel connection mode. The battery core in the battery pack can quickly generate a large amount of heat in the discharging process; when the heat is not dissipated in time, the battery pack is connected to the charger, and the charger cannot normally charge the battery pack at the moment, because the charger usually sets a circuit protection program, the charger starts the charging circuit to perform charging operation only when the temperature of the battery pack is determined to reach a preset low temperature. Therefore, if the battery pack does not have good heat dissipation performance, the heat generated in the discharging process cannot be dissipated quickly, and a large amount of time is needed for cooling before the next charging. In another case, if the charger is not provided with a circuit protection program, when the battery pack is not cooled, that is, the battery pack is electrically connected to the charger to be charged, the battery cell is damaged, the discharging capability of the battery pack is weakened, the service life of the battery pack is shortened, and even a safety accident is caused.

In the prior art, in order to dissipate heat of a battery pack, a battery holder having a heat dissipation function is disposed outside the battery pack, and the battery holder is at least partially made of a heat conductive material so as to conduct heat generated in a battery to the battery holder and dissipate the heat from the battery holder to the air.

Although, the battery holder can discharge heat loss generated in the battery to the air to some extent. However, since the heat generated during the discharging process is relatively rapid, in the absence of an auxiliary heat dissipation device such as a fan, the following were found during the use: most of the heat stays on the battery bracket, so that the heat on the battery bracket cannot be quickly conducted to the air. Further, because the inboard direct contact of electric core and battery holder, and the temperature of electric core is outside transmission, when electric core and battery holder's temperature tended to unanimous, battery holder can not further conduct heat, and the temperature on electric core surface can not further reduce promptly, just also can't make electric core reach the radiating effect of ideal.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a battery pack, at the electric core discharge process of battery pack, can improve the cooling efficiency of electric core, effectively reduce electric core and with the temperature of electric core direct contact's support.

The above object of the present invention can be achieved by the following technical solutions:

a battery pack, comprising: the battery module comprises a plurality of electric cores which are electrically connected; the battery cell support comprises a support body made of a heat conduction material, wherein the support body comprises a plurality of installation parts and a connection part, the connection part relatively fixedly connects the installation parts together, the installation parts are provided with accommodating cavities for accommodating the battery cells, a plurality of passages penetrating through the support body are preset in the support body, and the passages are distributed between the adjacent installation parts; and the shell is covered outside the bracket, and the shell is provided with airflow holes which can be communicated with the plurality of passages.

Further, the plurality of passages are independent of the accommodating cavity.

Further, the battery pack further comprises a heat storage part at least partially attached to the outer side of the support, and the specific heat capacity of the heat storage part is larger than that of the support.

Further, the heat storage part is made of a material with specific heat capacity of more than 2.6J/(g.K).

Further, the thermal conductivity of the heat conduction material is more than 0.3W/m.k.

Furthermore, the support is in be provided with the deformation portion on the lateral wall of installation department, the external diameter of electricity core is less than hold the aperture in chamber, electricity core accept in hold behind the chamber through the elastic deformation chucking of deformation portion and laminating are in hold in the chamber.

Further, the deformation portion is at least one protrusion formed inward of a side wall of the mounting portion.

Further, the outer diameter of the battery cell is larger than the aperture of the accommodating cavity, and the battery cell is arranged in the accommodating cavity of the mounting part in a hot-pressing tensioning mode.

Furthermore, the battery cell is provided with a first end face and a second end face which are opposite to each other and side surfaces which are arranged around the first end face and the second end face, and the joint area of the side surfaces and the installation part at least accounts for 80% of the side surfaces.

Furthermore, the passages are distributed between the outer side walls of the adjacent mounting parts, and the minimum distance between the passages is larger than 1.5 mm.

Further, the passage extends in an axial direction perpendicular to the cell.

Further, cooling fins are respectively arranged on the side walls of the installation parts on the two sides of the passage, the cooling fins are distributed at intervals along the axial direction of the battery cell, and the distribution length of the cooling fins accounts for 3/4 of the total axial length of the battery cell.

Furthermore, the battery pack also comprises a first opening which is at least partially attached to a heat storage part arranged on the outer side of the bracket, and the heat storage part is provided with a first opening communicated with the passage and the airflow hole; the housing includes opposing upper and lower covers, the airflow aperture including: the upper opening hole is formed in the upper cover, and the lower opening hole is formed in the lower cover; the passage penetrates through the bracket along an axial direction perpendicular to the battery cell.

Further, the battery pack further comprises a pressing piece, the pressing piece is pressed on the outer side of the heat storage piece and used for applying an acting force for clamping the support to the heat storage piece, and a second opening communicated with the first opening and the airflow hole is formed in the pressing piece; the first opening and the second opening are distributed on two sides of the passage in an order from inside to outside along an axial direction perpendicular to the battery core; the upper opening, the lower opening, the passage, the first opening and the second opening are matched to form a heat dissipation channel.

Further, the housing includes opposing upper and lower covers, and the airflow hole includes: the upper opening hole is formed in the upper cover, and the lower opening hole is formed in the lower cover; the support is provided with an end cover along the axial direction of the battery cell, the end cover is provided with a third opening, the passage penetrates through the support along the axial direction of the battery cell, and along the axial direction of the battery cell, the lower opening, the upper opening, the third opening and the passage are matched to form a heat dissipation channel.

A battery pack, comprising: the battery module comprises a plurality of electric cores which are electrically connected; the support is prepared from a heat conduction material and comprises a plurality of installation parts and a connection part, the connection part relatively fixedly connects the installation parts together, the installation parts are provided with accommodating cavities for accommodating the battery cells, the support is preset with a plurality of passages penetrating through the support, and the passages extend along the axial direction perpendicular to the battery cells; and the shell is provided with airflow holes which can be communicated with the plurality of passages.

Further, the plurality of passages are independent of the accommodating cavity.

The battery package that provides in this application embodiment improves through the structure to the battery package, is formed with independent heat dissipation channel in the inside of battery package, can carry out the efficient heat dissipation to the support in the battery package and the electric core that sets up with the support laminating for the battery package just can connect the charger to charge immediately after the end of discharging, thereby has practiced thrift the charge time for the user, protects electric core simultaneously effectively, promotes the discharge capacity and the life-span of battery package.

Specifically, through the support that the surface laminating degree height of setting and electric core just made by the heat conduction material, can outwards transmit the heat that electric core produced in the use through this heat dissipation channel efficient.

Further, the heat accumulation piece made of high specific heat capacity material is attached to the outer side of the support, and the heat accumulation piece can be used for efficiently absorbing heat in the support, so that the battery cell and the support attached to the battery cell can be reliably prevented from being over-heated.

When the improved battery pack is used, the working time of the battery pack can be prolonged, the discharging capacity of the battery pack is improved, and the improved battery pack is particularly suitable for high-temperature severe environments.

The utility model provides a support, the heat storage piece of battery package cooperate with the shell to be formed with the parallelly connected direct-blow heat dissipation passageway of multichannel, can dispel the heat to electric core, support to further can control the temperature of this battery package and support internal surface.

Drawings

The present invention will be further described with reference to the accompanying drawings and embodiments.

Fig. 1 is a schematic structural view of a battery pack provided in one embodiment of the present application;

fig. 2 is a sectional view a-a of the battery pack provided in fig. 1;

fig. 3 is an exploded view of the battery pack provided in fig. 1;

fig. 4 is a front view of a battery pack in the battery pack provided in fig. 1;

fig. 5 is an exploded view of a battery pack in the battery pack provided in fig. 1;

FIG. 6 is a schematic view of the distribution of fins on a rack provided in an embodiment of the present application;

FIG. 7 is a schematic diagram of the mating location of the bracket with the seal member and end cap of the battery pack of FIG. 1;

FIG. 8 is an enlarged view of a portion of FIG. 7 at M;

FIG. 9 is an enlarged view of a portion of FIG. 7 at N;

fig. 10 is a schematic structural view of a battery pack provided in one embodiment of the present application;

fig. 11 is a B-B sectional view of the battery pack provided in fig. 10;

fig. 12 is an exploded view of the battery pack provided in fig. 10;

fig. 13 is an exploded view of a battery assembly of the battery pack of fig. 10;

fig. 14 is a schematic structural view of a holder of the battery pack of fig. 13;

FIG. 15 is a front view of the bracket of FIG. 14;

fig. 16 is a schematic view of the mating position of the holder with the seal member and end cap of the battery pack of fig. 10;

fig. 17 is a partial enlarged view at H in fig. 16.

Description of reference numerals:

100. a battery assembly;

1. an electric core; 11. a conductive sheet; 12. a power supply board;

2. a support; 20. an installation part; 21. an accommodating chamber; 22. a passage; 23. a deformation section; 24. a connecting portion; 241. a heat sink; 25. sealing the end; 251. a pressing section; 252. a second mounting groove; 26. an abutting member;

3. a heat storage member; 31. a first opening;

4. a housing; 42. an upper cover; 420. opening a hole on the upper part; 43. a lower cover; 430. a lower opening is formed; 44. a first side plate; 45. a second side plate; 46. a first side cover; 47. a second side cover;

5. a compression member; 51. a second opening;

6. a heat dissipation channel;

7. a seal member; 71. a first seal portion; 72. a second seal portion;

8. an end cap; 80. a first mounting groove; 81. a third opening; 82. and a third mounting groove.

Detailed Description

The technical solution of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, it should be understood that these embodiments are only used for illustrating the present invention and are not used for limiting the scope of the present invention, and after reading the present invention, the modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the claims attached to the present application.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The utility model provides a battery package after improvement for prior art, at the electric core of battery package in-process of discharging, can improve the cooling efficiency of electric core, effectively reduce electric core and with the temperature of electric core direct contact's support, promote the discharge capacity of battery package.

Referring to fig. 1 to 12, in an embodiment of the present disclosure, a battery pack is provided, which mainly includes: the battery cell comprises a battery cell 1, a bracket 2, a shell 4, a sealing device, a plurality of components for matching installation and the like. As shown in fig. 5 or fig. 10, at least the battery cell 1, the holder 2, the sealing device, and the like may form a battery assembly 100 mounted in the housing 4.

In this specification, the number of the battery cells 1 and the serial-parallel connection manner between the battery cells 1 may be adjusted according to the voltage of the battery cells 1 themselves and different nominal voltages, and the application is not specifically limited herein. Specifically, the battery cells 1 may be connected in series or in parallel through the conductive sheets 11, or a combination of series and parallel. The number of the battery modules can be one or two or more.

Referring to fig. 2, in one embodiment, there may be two battery modules (one for each of the left and right). One battery module has 8 battery cells (as shown in fig. 5), and the other battery module has 7 battery cells. Further, the two battery modules are connected in series through the power supply board 12 to output 60V voltage.

Referring to fig. 9, in another embodiment, the number of the battery modules is two. Wherein, two battery modules can be connected in parallel through the power supply board 12. Each battery module can contain 15 battery cells 1 with 4 volts, and the battery cell 1 group with the nominal voltage of 60 volts formed by connecting 15 battery cells 1 in series. Then the two battery modules are connected in parallel, so that the output voltage is still 60V, but the current is 2 times of that of the 15 battery cells connected in series.

Specifically, 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 cover 47 disposed between the upper cover 42 and the lower cover 43. The first side plate 44 and the second side plate 45 are oppositely arranged, and the first side cover 46 and the second side cover 47 are oppositely arranged.

The case 4 is provided with an air flow hole for introducing and discharging outside air into and out of the battery pack. Specifically, the airflow hole may include an upper opening 420 provided on the upper cover 42 and a lower opening 430 provided on the lower cover 43. When the battery pack is used, the airflow hole of the shell 4 is matched with other structures in the battery pack to form a heat dissipation channel 6, so that the battery core 1 and the bracket 2 are cooled.

The battery cell 1 has a first end face and a second end face opposite to each other, and side surfaces surrounding the first end face and the second end face. The shape of the battery cell 1 may be cylindrical, and of course, the shape of the battery cell 1 may also be adaptively adjusted according to actual needs, for example, the battery cell may be a rectangular parallelepiped, or an approximate rectangular parallelepiped, or even other special-shaped structures. The shape and configuration of the battery cell 1 are not specifically limited in this application. In this specification, the battery cell 1 is mainly used as a cylindrical battery cell for example, and the shape of other battery cells can be referred to the present application by analogy.

In the prior art, a surface of a general battery core 1 is provided with a skin, and the skin is generally made of an insulating material (such as plastic) with poor heat conductivity. Further, under the condition that electric core 1 is provided with the epidermis, because the mode cover that the epidermis passes through the parcel is established at the surface of electric core 1, consequently this epidermis also can't laminate the setting with electric core 1 completely. This results in an easy formation of at least a partial air section between the skin and the cell 1. This air section and the poor epidermis of thermal conductivity all can influence the outside heat conduction of electricity core 1.

In this description, in order to conduct heat from the battery cell 1 as efficiently as possible to the outside, the outer surface of the battery cell 1 is subjected to a peeling process, i.e., no skin is provided. The electric core 1 after the peeling treatment is directly attached and installed in the support 2 subsequently, so that the heat conduction efficiency is improved.

In this specification, the bracket 2 is mainly used for mounting the battery cell 1. This support 2 is prepared by the heat conduction material, and it can be in time outwards conduct the heat on electric core 1. In particular, in order to ensure that the bracket 2 has good heat conductivity, the heat conductivity of the heat conductive material is more than 0.3W/m.k.

In order to improve the stability of the structure of the bracket 2 and reduce the difficulty of installation, the bracket 2 can be an integral bracket which can be integrally formed or can be arranged into separate bodies and then connected together through assembly. Of course, the present specification does not exclude the bracket 2 from being provided in a separate structure. The specific heat capacity range of the bracket 2 is larger than 1.8J/(g.K) so as to ensure that the bracket 2 can absorb the heat in the battery cell 1 with higher efficiency, and the absorbed heat can be rapidly conducted outwards in combination with the high heat conduction performance of the bracket. Specifically, the material of the bracket 2 may be polypropylene (PP), High Density Polyethylene (HDPE), Low Density Polyethylene (LDPE), or the like.

In this specification, the holder 2 may include a plurality of mounting portions 20, and a housing cavity 21 for housing the battery cell 1 is formed inside the mounting portions 20. Specifically, the number of the mounting portions 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. At least part of the battery cell 1 is fit and installed in the accommodating cavity 21.

In the present description, the integral type support 2 is mainly used as an example for illustration, and other types of supports 2 can be analogized and referred to. The integrated bracket 2 has a plurality of mounting portions 20, and the mounting portions 20 in the bracket 2 may be arranged in a predetermined arrangement order. For example, a plurality of mounting portions 20 may be arranged at intervals in a first direction to form a row of mounting portions 20; in a second direction perpendicular to the first direction, a plurality of rows of mounting portions 20 are arranged at intervals to form an array of mounting portions 20. Of course, the mounting portions 20 may be arranged in other sequences according to actual use requirements, and the present application is not limited thereto.

A plurality of passages 22 penetrating through the support 2 are preset in the support 2, and the passages 22 are distributed between the adjacent mounting parts 20. The inside of the bracket 2 is an area surrounded by a central connecting line of the electric core 1 at the outermost side in the battery module. The passage 22 is independent of the receiving chamber 21. When the passage 22 for dissipating heat by circulating airflow and the accommodating cavity 21 for accommodating the battery cell 1 are independent from each other and are not communicated with each other, the battery cell 1 can utilize the heat conduction bracket 2 to conduct heat, and the heat conductivity is high.

Compared with the case that the passage 22 and the accommodating cavity 21 are not independent from each other, namely the air flow passage 22 is communicated with the accommodating cavity 21, the air is mainly used for conducting heat due to the fact that the air flow passage 22 is communicated with the accommodating cavity 21, the heat conductivity of the air is not high than that of the heat conducting bracket 2, and the heat conducting effect is poor. In addition, after the passage 22 and the accommodating cavity 21 are mutually independent, the subsequent arrangement of a waterproof sealing structure is facilitated, and the passage 22 and the accommodating cavity 21 are not mutually independent, so that the interference with the waterproof sealing structure is not easy to occur.

Specifically, the mounting portion 20 may be a cavity with a certain wall thickness. The hollow part of the cavity is the accommodating cavity 21. The mounting portion 20 includes a side wall, a positioning opening, and a mounting opening opposite the positioning opening.

In one embodiment, the outer diameter of the battery cell 1 is larger than the aperture of the accommodating cavity 21, and the battery cell 1 may be disposed in the accommodating cavity 21 of the mounting portion 20 by hot-pressing and tightening.

When this electricity core 1 sets up in holding chamber 21 through the tight mode setting of hot pressing, the external diameter of electricity core 1 is greater than hold the aperture of chamber 21, and the initial surface area that holds chamber 21 in the support 2 is less than the external surface area of electricity core 1, and after electricity core 1 installed into holding chamber 21 through the tight mode installation of hot pressing, this lateral surface of electricity core 1 can be directly laminated completely with the lateral wall in the installation department 20, and the percentage (the laminating degree promptly) of laminating area accounting for the side area can be close to 100%.

In another embodiment, the bracket 2 is provided with a deformation portion 23 on a side wall of the mounting portion 20, an outer diameter of the battery cell 1 is smaller than an aperture of the accommodating cavity 21, and the battery cell 1 is clamped in the accommodating cavity 21 after being elastically deformed by the mounting portion 20 provided with the deformation portion 23.

Specifically, the deformation portion 23 may be at least one protrusion formed inward of a sidewall of the mounting portion 20. After this electricity core 1 takes place elastic deformation through the deformation portion 23 on the installation department 20 lateral wall, is blocked tightly when holding in the chamber 21, the initial surface area that holds chamber 21 in the support 2 is greater than the exterior surface area of electricity core 1, after this deformation portion 23 installation of electricity core 1 through the extrusion holds chamber 21, the lateral surface of this electricity core 1 can most be directly with the installation department 20 in the lateral wall laminating, the laminating degree is more than 80%.

As shown in fig. 4, the number of the projections is exemplified as one or two. The projection may be disposed on a side relatively close to the mounting opening. When electric core 1 was adorned from this installing port, elastic deformation can take place for this arch for can be in this installation department 20 with this electric core 1 chucking when this electric core 1 is adorned, laminate mutually with the chamber 21 that holds of installation department 20 with the lateral surface of guaranteeing this electric core 1. In addition, even if the battery pack vibrates during use, each of the battery cells 1 can be closely fitted in the accommodation cavity 21 of the mounting portion 20 by elastic deformation of the protrusion.

The deformation portion 23 may be an opening provided in a side wall of the mounting portion 20. Deformation can take place for this installation department through setting up this opening to can laminate with electric core 1 better. Of course, the form of the deformation portion 23 is not limited to the above example.

On the whole, no matter which kind of mounting means is adopted, the area of laminating that need guarantee every side surface of electric core 1 and installation department 20 accounts for at least 80% of the side surface, and then can guarantee that the heat that this electric core 1 produced in the work can conduct for support 2 fast.

In this specification, the battery pack may further include a heat storage member 3 at least partially attached to the outside of the holder 2. The heat storage part 3 can be made of a material with high specific heat capacity and strong heat absorption capacity. Specifically, the specific heat capacity of the heat storage piece 3 is greater than that of the support 2, and at least part of the heat storage piece 3 is attached to the outer side of the support 2, so that the heat in the support 2 can be efficiently absorbed, and the support 2 and the battery cell 1 attached to the support 2 are not over-heated in temperature. When the battery pack is placed on the charger, a large amount of heat accumulated in the heat storage member 3 can be cooled by activating the fan of the charger.

Specifically, the heat storage member 3 is made of a high specific heat capacity heat storage material having a specific heat capacity of more than 2.6J/(g.K). The high specific heat capacity material is a non-phase change material, and can be any one of the following materials: high polymer materials, high heat conduction materials and silica gel; of course, the high specific heat capacity material can also adopt a phase change material. When the heat storage part 3 is a non-phase-change high specific heat capacity material, the heat storage part can absorb heat with stable specific heat capacity parameters in the heat absorption process, and the phase change does not occur in the heat absorption process. When the heat storage member 3 does not undergo phase change in the heat absorption process, not only can high heat absorption efficiency be maintained, but also the overall structure of the battery pack can be simplified. When the phase change material is used as the main material of the heat storage unit 3, since the phase change material changes its state during use, for example, it changes from a solid state to a molten state, it is structurally necessary to provide a containing chamber for containing the phase change material, or to seal the phase change material.

In the present specification, a connecting portion 24 is provided between two adjacent mounting portions 20 in the bracket 2. Specifically, the connecting portion 24 is integrally formed with the sealing end 25. The connecting portion 24 is located near an end of the mounting portion 20. The ends of the plurality of mounting portions 20 form both ends of the bracket 2.

In order to ensure the waterproof sealing performance of the battery core 1 in the battery pack, sealing devices are arranged at two ends of the support 2. Specifically, the ends of the plurality of mounting portions 20 form both ends (i.e., sealing ends 25) of the bracket 2. The sealing arrangement comprises a sealing member 7 and an end cap 8. The sealing element 7 is arranged between the sealing end 25 and the end cap 8, and reliably seals the battery cell 1. The shape and configuration of the sealing element 7 are determined mainly by the shape of the receiving space formed by the end cap 8 and the sealing end 25 and the position to be sealed. The sealing end 25 may be an annular projection at the end of the holder 2, which projection may be integrally formed with the holder 2, or the projection may be fixed to the end of the holder 2 by means of a detachable connection. When no openings are provided in the end cap 8, the seal 7 may be in the form of a seal ring with a wall thickness, as shown in figure 5. When the end cap 8 is provided with an opening, the seal 7 may be in the form of a sealing disc provided with an opening, as shown in fig. 13.

In the battery pack, a heat dissipation channel 6 is formed, please refer to fig. 1 to 6, in some embodiments, a flowing direction of the airflow in the heat dissipation channel 6 may be entirely perpendicular to an axial direction of the battery cell 1. In the present embodiment, the outer surface walls of two adjacent mounting portions 20 form a passage 22 with a predetermined gap therebetween. The passage 22 extends in an axial direction perpendicular to the battery cell 1, and a first opening 31 communicating with the predetermined passage 22 and the airflow hole is provided in a side wall of the heat storage member 3.

The heat storage part 3 can comprise a first part and a second part, and the first part and the second part can be attached and fixed on the outer side of the bracket 2 in a detachable connection mode or other limiting modes. Wherein the inner surfaces of the first and second portions may match the outer side of the holder 2. The first and second portions are provided with first openings 31 communicating with said passage 22.

The passage 22 is adapted to cooperate with the first opening 31 of the heat storage member 3 in the battery pack, the air flow hole of the case 4, and the like, thereby forming the heat dissipation channel 6. The connecting portion 24 is located near the end face of the battery cell 1. The passage 22 between the two connecting portions 24 at the end can be used for circulating airflow in the axial direction of the battery cell 1 except for the positions of the connecting portions 24. After the long-length passages 22 are formed between the battery cells 1 of the battery pack, the battery pack is beneficial to ensuring that the battery pack has a better heat dissipation effect when in use.

In this embodiment, the passages are distributed between the outer side walls of the adjacent mounting portions, and in order to meet the heat dissipation requirement, the minimum distance between the passages is greater than 1.5 mm.

As shown in fig. 6, in order to ensure that the heat dissipation channel has a good heat dissipation effect on the bracket 2, heat dissipation fins 241 are respectively disposed on the side walls of the mounting portion 20 between the connection portions 24. The heat dissipation fins are distributed at intervals along the axial direction of the battery cell 1. The heat dissipation fins 241 of two adjacent mounting portions 20 are arranged to face each other, forming a central heat dissipation area. The heat sink 241 is mainly used for rapidly transferring heat conducted from the battery cell 1 to the support 2 to the outside through the heat dissipation channel 6. In order to increase the heat dissipation effect of the heat dissipation fins 241 as much as possible, the length of the heat dissipation fins 241 is 3/4 of the total axial length of the battery cell 1.

Further, considering that the heat sink 241 is disposed in the space where the passage 22 is located, in order to ensure that the central heat dissipation area where the heat sink 241 is located has a better cooling effect on the bracket 2 when air flows through, the distance between the outer side walls of the two mounting portions 20 cannot be too small, and is generally not less than 5 mm. Considering that the overall size of the battery pack cannot be excessively large, particularly, limited by the installation space, the size of the case of the battery pack cannot be excessively large, and generally, the distance between the outer side walls of the two mounting portions 20 cannot be excessively large, and generally cannot be larger than 15 mm. Overall, the distance of the passages 22 in the axial direction perpendicular to the battery cells 1 is between 5mm and 15 mm, provided that the heat sink 241 is provided.

As shown in fig. 5, in some embodiments, the battery pack may be further provided with a pressing member 5. The pressing piece 5 is pressed on the outer side of the heat storage piece 3 and is used for applying acting force for clamping the bracket 2 to the heat storage piece 3.

In this embodiment, the compressing member 5 may be made of a rigid material, and the compressing member 5 may be attached to the outer surface of the heat storage member 3, so that the heat storage member 3 may be reliably attached to the support 2, and it is ensured that the heat storage efficiently absorbs heat from the support 2. In particular, the pressure means 5 has an inner side which is relatively close to the heat storage means 3 and an outer side which is relatively far from the heat storage means 3. Wherein, the shape that should compress tightly the inboard of piece 5 and this heat-retaining member 3 outside can be similar to guarantee to compress tightly 5 and can act on the surface of this heat-retaining member 3 reliably, prevent in the use because of vibrations or other nonreactive factors, lead to compressing tightly 5 to compress tightly the inefficacy to heat-retaining member 3.

Specifically, the pressing member 5 may be divided into two parts, and the two parts may be fixed to each other in a detachable manner. The detachable connection mode may be a bolt, a screw, or other connection modes, and of course, the application is not limited in this respect.

When the heat storage member 3 is attached and fixed outside the bracket 2 by the pressing member 5, the pressing member 5 may be provided with a second opening 51 communicating with the first opening 31 and the airflow hole.

As shown in fig. 2 and 5, specifically, the first opening 31 and the second opening 51 are distributed on two sides of the mounting portion 20 in an order from inside to outside along an axial direction perpendicular to the battery cell 1. The upper opening 420, the lower opening 430, the channel 22, the first opening 31 and the second opening 51 cooperate to form a heat dissipation channel 6. After entering the battery pack through the lower opening 430, the external air sequentially flows through the second opening 51, the first opening 31, the passage 22, the first opening 31, and the second opening 51, and flows out of the battery pack through the upper opening 420.

The second opening 51 may be opposite to the first opening 31. The airflow hole is opposite to the passage 22 between the mounting portions 20, and external airflow passes through the airflow hole on the housing 4, directly leads to the central heat dissipation area corresponding to the passage 22 after flowing through the second opening hole 51 and the first opening hole 31, and then flows out of the housing 4 through the first opening hole 31 and the second opening hole 51 to form the heat dissipation channel 6. On the whole, this heat dissipation channel 6 is the parallelly connected blow-through heat dissipation channel 6 of multichannel that forms by the short path runner of stranded parallel arrangement, can direct efficient effect on every installation department 20 of support 2 to can be to support 2 and be located the high-efficient heat dissipation of electric core 1 in support 2.

In some embodiments, the pressing member 5 may not be separately provided in the battery pack. The heat storage element 3 can be applied to the outer surface of the holder 2 by the housing 4 abutting directly against the heat storage element 3. In addition, the heat dissipation channel 6 is mainly formed by the cooperation of the airflow hole on the housing 4, the first opening 31 on the heat storage member 3 and the central heat dissipation area between the mounting portions 20.

In this specification, there is also provided a battery pack, which may include: at least one battery module, the battery module includes: a plurality of electrically connected cells 1; the support 2 is made of heat conducting materials, the support 2 comprises a plurality of mounting parts 20 and a connecting part 24, the connecting part 24 relatively fixedly connects the mounting parts 20 together, the mounting parts 20 form accommodating cavities 21 for accommodating the battery cells 1, the support 2 is preset with a plurality of passages 22 penetrating through the support 2, and the passages 22 extend along an axial direction perpendicular to the battery cells 1; and the shell 4 is provided with an airflow hole which can be communicated with the plurality of passages 22.

In this embodiment, please refer to the detailed description in the above embodiments for the specific shapes, structures, relative position relationships, etc. of the battery core 1, the support 2 made of the heat conductive material, and the housing 4 included in the battery, which are not described herein again.

In the battery pack provided in the present embodiment, a passage formed in the support 2 extends in the axial direction perpendicular to the battery cells 1, and the passage is used for cooperating with the airflow hole on the casing 4 to form a heat dissipation channel 6 for cooling the support 2 and the battery cells 1 disposed in the support 2. Because this heat dissipation channel 6 distributes with the sealing device that is located this support 2 both ends mutually independent in the space, each other does not influence, consequently can reduce sealing device's the degree of difficulty that sets up, and guarantee that this sealing device can reliably seal electric core 1.

As shown in fig. 7, the sealing means are respectively provided at both sides of the sealing end 25 of the holder 2. The sealing device comprises an end cap 8 and a sealing member 7. Here, as shown in fig. 8, when one side of the support 2 is not required to draw out the conductive sheet 11, a pressing portion 251 may be provided at the sealing end 25. Specifically, the pressing portion 251 may be an annular protrusion formed on the outer surface of the sealing end 25, but the pressing portion 251 may also have other shapes or other arrangements, and the application is not limited thereto. A first mounting groove 80 for mounting the sealing element 7 is provided on the end cap 8. When assembling, the sealing element 7 is installed in the first installation groove 80 of the end cover 8, 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 pressing part 251 at the sealing end 25 can be contacted with the sealing element 7, and the sealing element 7 is elastically deformed under the pressing force formed after the end cover 8 is matched with the bracket 2, so that sealing is realized.

As shown in fig. 9, when the conducting strip 11 needs to be led out of the end cover from the other side of the bracket 2, in order to make the sealing performance better at the position where the conducting strip 11 is extended, a second mounting groove 252 may be formed at the sealing end 25, and an abutting member 26 having elastic deformation capability may be provided in the second mounting groove 252. Specifically, one end of the abutting member 26 extends into the second mounting groove 252, the other end of the abutting member contacts with the sealing member 7, and the abutting member 26 and the sealing member 7 are elastically deformed under the action of the extrusion force formed after the end cover 8 is matched with the bracket 2, so that compared with a non-deformed or rigid abutting member, the abutting member 26 with elasticity can better eliminate the gap between the end cover 8 and the bracket 2. Specifically, the abutting member 26 may be in the form of EVA foam, an O-ring, a heat shrink tube, etc., but may also be in other forms having elastic deformation capability, and the application is not limited in this respect.

In addition, in order to ensure the sealing performance of the fitting position, for example, to preferably ensure the sealing performance at the protruding position of the conductive plate 11, and to achieve the waterproof function, the abutting member 26 may be formed by injecting glue into the second mounting groove 252. In addition, at other cooperation positions, the sealing element can be formed in a glue injection mode, so that the sealing reliability of the position to be sealed is ensured.

As shown in fig. 10 to 15, in other embodiments, the flow direction of the airflow in the heat dissipation channel 6 may be entirely parallel to the axial direction of the battery cell 1. The end cap 8 is provided with a third opening 81. Specifically, as shown in fig. 14 and 15, the passage 22 penetrates the holder in the axial direction of the battery cell 1. Specifically, the passage 22 may be located in an area surrounded by four adjacent mounting portions 20, and the passage 22 is not communicated with the accommodating cavity between the mounting portions 20, so as to ensure the sealing performance of the battery cell 1.

When the end cap 8 is provided with a third opening 81, the seal 7 comprises a first seal portion 71 for mating with the third opening 81 of the end cap 8, the passage 22 of the holder 2, and a second seal portion 72 for mating with the end cap 8 and the sealing end 25 of the holder 2, as shown in fig. 13.

Specifically, the first seal portion 71 may be annular, and provided between the passage 22 of the holder 2 and the third opening 81 of the end cap 8 to seal the passage 22 of the holder 2 and the mounting portion 20 in the circumferential direction, while serving as an intermediate communication portion to communicate the third opening 81 and 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, and is disposed between the sealing end cap 8 and the sealing end 25 of the bracket 2 to realize sealing. The first sealing portion 71 and the second sealing portion 72 may be integrally formed or may be separately formed, and the present application is not limited thereto.

Along the axial direction of the battery cell 1, the third openings 81 are distributed at two ends of the battery cell 1. The lower opening 430, the upper opening 420, the third opening 81 and the passage 22 cooperate to form the heat dissipation channel 6. After entering the battery pack through the lower opening 430, the external air may sequentially flow through the third opening 81, the passage 22, and the third opening 81, and then flow out of the battery pack through the upper opening 420.

In the present embodiment, the heat dissipation channel 6 is also a multi-channel parallel direct-blowing heat dissipation channel formed by a plurality of short-path flow channels arranged in parallel. The difference from the above embodiment is that: the whole flow direction of the gas in the heat dissipation channel 6 is parallel to the axial direction of the battery core 1. On the whole, this heat dissipation channel 6 is the parallelly connected blow-through heat dissipation channel of multichannel, and the air current that flows through this heat dissipation channel 6 can direct efficient be used in every installation department 20 of support 2 to can be to support 2 and be located the 1 efficient heat dissipation of electric core in support 2.

Referring to fig. 16 and 17, the channel 22 formed in the support 2 is parallel to the axial direction of the battery cell 1. Therefore, the sealing device provided at the sealing end 25 of the bracket 2 not only needs to have a sealing function, but also needs to cooperate with the passage 22 of the bracket 2 and the housing 4 to form the heat dissipation channel 6.

Specifically, the inner surface of the outer periphery of the end cap 8, which is engaged with the bracket 2, is formed with a first mounting groove 80, and the first mounting groove 80 is used for mounting the second sealing part 72. The outer surface of the sealing end 25 of the bracket 2 facing the first mounting groove 80 is provided with a pressing portion 251. Specifically, the pressing portion 251 may be an annular protrusion formed on the outer surface of the sealing end 25, but the pressing portion 251 may also have other shapes or other arrangements, and the application is not limited thereto.

The third opening 81 provided in the end cap 8 faces the passage 22 of the holder 2. The end cap 8 is formed with a third mounting groove 82 at an inner side fitted with the holder 2, the third mounting groove 82 being for mounting the first sealing part 71. Accordingly, the outer surface of the sealing end 25 of the bracket 2 opposite to the third mounting groove 82 is also provided with a pressing portion 251. Specifically, the pressing portion 251 may be an annular protrusion formed on the outer surface of the sealing end 25.

When the end cover 8 provided with the sealing element 7 is connected to the sealing end 25 of the bracket 2 through a connecting piece, the pressing part 251 at the sealing end 25 can be in contact with the sealing element 7, and the sealing element 7 is elastically deformed under the action of the pressing force formed after the end cover 8 is matched with the bracket 2, so that the waterproof sealing of the sealing end 25 of the bracket 2 can be realized, and the connectivity between the passage 22 in the bracket 2 and the airflow hole of the shell 4 can not be influenced.

Under a specific use scenario, for example, for a high-power direct current tool in a high-temperature environment, the external environment temperature is high, in addition, the tool power is high, the heat productivity is high, the heat generated in the battery pack cannot be timely transmitted outwards at the moment, so that the discharging capacity of the battery pack is insufficient, and the use requirement of a high-function direct current tool at a high temperature cannot be met.

The battery pack provided by the application has the advantages that the bracket 2 which is high in surface fitting degree with the battery core 1 and made of heat conducting materials is arranged, so that heat generated by the battery core 1 in the using process can be efficiently conducted outwards; further, the heat accumulation piece 3 that is prepared by high specific heat capacity material after the laminating of the outside of this support 2 utilizes this heat accumulation piece 3 can be with the efficient absorption of heat in the support 2 to can guarantee reliably that electric core 1 and with this electric core 1 is not overtemperature to the support 2 of laminating. When the improved battery pack is used, the working time of the battery pack can be prolonged, and the discharging capacity of the battery pack is improved.

Further, support 2, heat-retaining piece 3 and the shell 4 of the battery package of this application cooperate to be formed with the parallelly connected direct-blow heat dissipation channel of multichannel, can dispel the heat to electric core 1 to further can control the temperature of this battery package and 2 internal surfaces of support.

It should be noted that, in the description of the present application, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is intended or should be construed to indicate or imply relative importance. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.

The above embodiments in the present specification are all described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment is described with emphasis on being different from other embodiments.

The above description is only a few embodiments of the present invention, and although the embodiments of the present invention are disclosed as above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (17)

1. A battery pack, comprising:

the battery module comprises a plurality of electric cores which are electrically connected;

the battery cell support comprises a support body made of a heat conduction material, wherein the support body comprises a plurality of installation parts and a connection part, the connection part relatively fixedly connects the installation parts together, the installation parts are provided with accommodating cavities for accommodating the battery cells, a plurality of passages penetrating through the support body are preset in the support body, and the passages are distributed between the adjacent installation parts;

and the shell is covered outside the bracket, and the shell is provided with airflow holes which can be communicated with the plurality of passages.

2. The battery pack of claim 1, wherein the plurality of passageways are independent of the receiving cavity.

3. The battery pack of claim 1, further comprising a heat storage member at least partially attached to the outside of the frame, wherein the heat storage member has a specific heat capacity greater than the specific heat capacity of the frame.

4. The battery pack according to claim 3, wherein the heat storage member is made of a material having a specific heat capacity of more than 2.6J/(g.K).

5. The battery pack of claim 1, wherein the thermally conductive material has a thermal conductivity greater than 0.3W/m.k.

6. The battery pack according to claim 1, wherein the bracket is provided with a deformation portion on a side wall of the mounting portion, an outer diameter of the battery cell is smaller than an aperture of the accommodating cavity, and the battery cell is clamped and fitted in the accommodating cavity by elastic deformation of the deformation portion after being accommodated in the accommodating cavity.

7. The battery pack according to claim 6, wherein the deformation portion is at least one protrusion formed inward of a side wall of the mounting portion.

8. The battery pack of claim 1, wherein the outer diameter of the battery cell is larger than the aperture of the accommodating cavity, and the battery cell is arranged in the accommodating cavity of the mounting portion in a hot-pressing tensioning manner.

9. The battery pack according to claim 6 or 8, wherein the battery cell has first and second opposite end faces and a side surface surrounding the first and second end faces, and an attaching area of the side surface and the mounting portion occupies at least 80% of the side surface.

10. The battery pack of claim 1, wherein the vias are distributed between outer sidewalls of adjacent mounting portions, and a minimum spacing of the vias is greater than 1.5 mm.

11. The battery pack according to claim 1, wherein: the passage extends in an axial direction perpendicular to the cell.

12. The battery pack according to claim 11, wherein: and radiating fins are respectively arranged on the side walls of the installation parts on the two sides of the passage, the radiating fins are distributed at intervals along the axial direction of the battery cell, and the distributed length of the radiating fins accounts for 3/4 of the total axial length of the battery cell.

13. The battery pack according to claim 11, wherein: the heat storage part is at least partially attached to the outer side of the bracket, and a first opening communicated with the passage and the airflow hole is formed in the heat storage part; the housing includes opposing upper and lower covers, the airflow aperture including: the upper opening hole is formed in the upper cover, and the lower opening hole is formed in the lower cover; the passage penetrates through the bracket along an axial direction perpendicular to the battery cell.

14. The battery pack according to claim 13, further comprising a pressing member pressed on an outer side of the heat storage member for applying an urging force to the heat storage member for chucking the holder, the pressing member being provided with a second opening communicating with the first opening and the airflow hole;

the first opening and the second opening are distributed on two sides of the passage in an order from inside to outside along an axial direction perpendicular to the battery core; the upper opening, the lower opening, the passage, the first opening and the second opening are matched to form a heat dissipation channel.

15. The battery pack of claim 1, wherein the housing includes opposing upper and lower covers, the airflow aperture comprising: the upper opening hole is formed in the upper cover, and the lower opening hole is formed in the lower cover; the support is provided with an end cover along the axial direction of the battery cell, the end cover is provided with a third opening, the passage penetrates through the support along the axial direction of the battery cell, and along the axial direction of the battery cell, the lower opening, the upper opening, the third opening and the passage are matched to form a heat dissipation channel.

16. A battery pack, comprising:

the battery module comprises a plurality of electric cores which are electrically connected;

the support is prepared from a heat conduction material and comprises a plurality of installation parts and a connection part, the connection part relatively fixedly connects the installation parts together, the installation parts are provided with accommodating cavities for accommodating the battery cells, the support is preset with a plurality of passages penetrating through the support, and the passages extend along the axial direction perpendicular to the battery cells;

and the shell is provided with airflow holes which can be communicated with the plurality of passages.

17. The battery pack of claim 16, wherein the plurality of passageways are independent of the receiving cavity.

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