CN221041252U - Battery pack and energy storage power supply - Google Patents

Abstract

The embodiment of the utility model relates to the technical field of energy storage batteries, and particularly discloses a battery pack and an energy storage power supply, which comprise a shell, wherein a battery cavity and a through hole communicated with the battery cavity are arranged; the battery cell assembly is accommodated in the battery cavity and comprises a plurality of battery cells stacked along a first direction; the heat conducting piece is attached to one side of the battery cells, which is away from the bottom of the battery cavity, at one side of the heat conducting piece; the heat dissipation piece is arranged on the other side of the heat conduction piece, and at least part of the heat dissipation piece extends out of the through hole, wherein along a second direction, the heat dissipation piece coincides with projections of the plurality of battery cores and the heat conduction piece, and the second direction is perpendicular to the first direction. Through the mode, the embodiment of the utility model can realize heat dissipation of the battery cells at different positions.

Description

Battery pack and energy storage power supply

Technical Field

The embodiment of the utility model relates to the technical field of energy storage batteries, in particular to a battery pack and an energy storage power supply.

Background

In the current market, the commonly used battery comprises a single battery core, the electric quantity of the single battery core is small, and in order to increase the electric quantity, a plurality of battery cores are generally wrapped to form a new battery pack, and the problem of small electric quantity of the battery can be solved by the new battery pack. The new battery pack generally utilizes a shell to place a plurality of electric cells, and the shell can reduce the contact between the outside and the electric cells and the damage of the electric cells so as to realize the protection of the electric cells.

Because the positions of the battery cells positioned in the shell are different, the battery cells have different radiating effects, wherein, the battery cells close to the side wall of the shell have better radiating effect, and the battery cells far away from the side wall of the shell have poorer radiating effect, so that the temperature difference of the battery cells at different positions is easy to cause to be larger, and the service life of the whole battery pack is influenced.

Disclosure of utility model

In view of the foregoing, embodiments of the present utility model provide a battery pack and an energy storage power supply that overcome or at least partially solve the foregoing problems.

According to an aspect of the present utility model, there is provided a battery pack including a case provided with a battery chamber and a through hole communicating with the battery chamber; the battery cell assembly is accommodated in the battery cavity and comprises a plurality of battery cells stacked along a first direction; the heat conducting piece is attached to one side of the battery cells, which is away from the bottom of the battery cavity, at one side of the heat conducting piece; the heat dissipation piece is arranged on the other side of the heat conduction piece, and at least part of the heat dissipation piece extends out of the through hole, wherein along a second direction, the heat dissipation piece coincides with projections of the plurality of battery cores and the heat conduction piece, and the second direction is perpendicular to the first direction.

In an alternative form, each cell includes an electrode assembly, a cell housing for housing the electrode assembly, and a tab electrically connected to the electrode assembly; the battery pack comprises a metal sheet, wherein the metal sheet is attached to the lugs of the plurality of battery cells and is used for realizing series connection or parallel connection among the plurality of battery cells, and a connecting part is arranged on the metal sheet; the battery pack also comprises a control circuit board, wherein the control circuit board is arranged in the battery cavity, and the control circuit board is electrically connected with the connecting part.

In an alternative manner, the battery pack includes an insulating sheet attached to the other side of the heat conductive member, and the insulating sheet is located between the heat conductive member and the heat dissipation member.

In an optional mode, the heat dissipation piece includes base and a plurality of fin, one side butt of base in the insulating piece, a plurality of fin interval set up in the opposite side of base, adjacent the interval is formed with the heat dissipation passageway between the fin, a plurality of heat that the electricity core produced can pass through heat conduction piece, insulating piece and follow in the heat dissipation passageway transmits to the air.

In an optional mode, the casing includes drain pan and upper cover, the battery chamber is located on the drain pan, be provided with the intercommunication on the casing the opening in battery chamber, the upper cover lid is located the opening, just the upper cover with can dismantle between the drain pan and be connected, the through-hole is located the upper cover.

In an alternative mode, a connecting column is arranged on the bottom shell, and a first screw hole is arranged on the connecting column; the upper cover is provided with a second screw hole which is opposite to the first screw hole; the shell further comprises a connecting screw, and one end of the connecting screw penetrates through the second screw hole to be screwed into the first screw hole.

In an optional mode, the electric core assembly comprises an electric core support, the electric core support is arranged in the battery cavity, the electric core support is at least partially abutted with the inner wall of the shell, a plurality of limiting grooves are formed in the electric core support, and one electric core is arranged in one limiting groove.

In an optional manner, the battery cell support separates the battery cavity to form a first space and a second space, the first space is communicated with the through hole, the battery cell support is located in the first space, and the second space is formed by a preset distance between one end of the battery cell support and a side wall of the battery cavity.

In an alternative mode, the heat dissipation piece is detachably connected with the heat conduction piece and the battery cell bracket.

According to another aspect of the present utility model there is provided an energy storage power supply comprising a battery pack as described above.

The embodiment of the utility model has the beneficial effects that: unlike the prior art, the embodiment of the utility model is provided with a shell, a battery cell assembly, a heat conducting piece and a heat radiating piece. The shell is provided with a battery cavity and a through hole communicated with the battery cavity, the battery core assembly is accommodated in the battery cavity and comprises a plurality of battery cores stacked along a first direction, one side of each heat conducting piece is attached to a plurality of battery cores deviating from one side of the bottom of the battery cavity, the heat radiating piece is arranged on the other side of each heat conducting piece, at least part of each heat radiating piece extends out of the through hole, the heat radiating piece coincides with the projections of the plurality of battery cores and the heat conducting piece along a second direction, the second direction is perpendicular to the first direction, and heat generated by the plurality of battery cores can be transmitted to the heat radiating piece through the heat radiating piece and is conducted to the outside air, so that heat dissipation of battery cores at different positions is realized, the situation that the temperature difference of the battery cores at different positions is large is reduced, battery pack performance attenuation or damage caused by unbalanced battery core temperature is avoided, and the service life of the battery pack is prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.

Fig. 1 is a schematic view showing the overall structure of a battery pack according to an embodiment of the present utility model;

FIG. 2 is an exploded view showing the overall structure of a battery pack according to an embodiment of the present utility model;

FIG. 3 is a schematic view showing a part of the structure assembly of a battery pack according to an embodiment of the present utility model;

FIG. 4 is a schematic view showing the assembly of a further part of the structure of a battery pack according to an embodiment of the present utility model;

FIG. 5 is an enlarged schematic view of the structure shown at A in FIG. 2;

FIG. 6 is a schematic view of the internal heat flow path of a battery pack according to an embodiment of the present utility model;

Fig. 7 is a schematic view of another flow path of internal heat of a battery pack according to an embodiment of the present utility model.

Detailed Description

In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

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 utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.

In addition, the technical features mentioned in the different embodiments of the application described below can be combined with one another as long as they do not conflict with one another.

Referring to fig. 1-3, the battery pack 1000 includes a housing 10, a battery module 20, a heat conducting member 30, a heat dissipating member 40, a metal sheet 50, an insulating sheet 60, and a control circuit board 70. The battery cell assembly 20, the heat conducting member 30, the heat dissipating member 40, the metal sheet 50, the insulating sheet 60 and the control circuit board 70 are all disposed in the housing 10, the control circuit board 70 is electrically connected with the battery cell assembly 20, one side of the metal sheet 50 is attached to one side of the battery cell assembly 20, one side of the heat conducting member 30 is attached to the other side of the metal sheet 50, one side of the insulating sheet 60 is attached to the other side of the heat conducting member 30, the heat dissipating member 40 is attached to the other side of the insulating sheet 60, the heat conducting member 30 is located between the metal sheet 50 and the insulating sheet 60, and the insulating sheet 60 is located between the heat conducting member 30 and the heat dissipating member 40. The housing 10, the battery module 20, the heat conducting member 30, the heat dissipating member 40, the metal sheet 50, the insulating sheet 60, and the control circuit board 70 will be described in detail below.

As for the above-described case 10, as shown in fig. 1 and 2, the case 10 is provided with a battery chamber 10a and a through hole 10b communicating with the battery chamber 10 a. The casing 10 is in a substantially rectangular parallelepiped state, the battery cavity 10a therein may be used to accommodate the battery cell assembly 20, and the through hole 10b may allow a portion of the heat dissipation member 40 to protrude, so that heat on the heat dissipation member 40 is transferred to the outside air. The casing 10 includes a bottom casing 101 and an upper cover 102, the battery cavity 10a is located on the bottom casing 101, an opening for communicating with the battery cavity 10a is provided on the casing 10, the upper cover 102 is covered on the opening, the upper cover 102 is detachably connected with the bottom casing 101, and the through hole 10b is located on the upper cover 102. The cell assembly 20 may be mounted within the battery cavity 10a from the opening, after which the upper cover 102 covers the opening.

In some embodiments, the bottom case 101 is provided with a connection post 1011, the connection post 1011 is provided with a first screw hole 1011a, the upper cover 102 is provided with a second screw hole 102a, the second screw hole 102a is opposite to the first screw hole 1011a, the housing 10 further includes a connection screw 103, and one end of the connection screw 103 is screwed into the first screw hole 1011a through the second screw hole 102a, so as to realize detachable connection between the bottom case 101 and the upper cover 102. It will be appreciated that: the detachable connection between the bottom case 101 and the upper cover 102 is not limited to the screw connection, and may be other manners, for example: riveting, clamping, and the like.

As shown in fig. 2 to 4, for the above-mentioned cell assembly 20, the metal sheet 50 and the control circuit board 70, the cell assembly 20 includes a plurality of cells 21 stacked along a first direction, a plurality of the cells 21 are electrically connected through the metal sheet 50, and the control circuit board 70 realizes electrical conduction between the cell assembly 20 and the metal sheet 50. Each of the cells 21 includes an electrode assembly, a cell case 10 accommodating the electrode assembly, and tabs electrically connected to the electrode assembly, and each of the cells 21 may be connected in series or in parallel. In this embodiment, the plurality of electric cores 21 are connected in parallel, the number of the metal sheets 50 is at least two, one metal sheet 50 is connected to one tab of the plurality of electric cores, the other metal sheet 50 is connected to the other tab of the plurality of electric cores, and then the two metal sheets 50 are respectively electrically connected to the control circuit board 70, so as to realize the electrical connection between the control circuit board 70 and the electric core assembly 20. Optionally, a connection portion 50a is disposed on the metal sheet 50, and the connection portion 50a is electrically connected to the control circuit board 70. Optionally, the metal sheet 50 is a nickel sheet, and the control circuit board 70 is a BMS circuit board, which can be used to monitor the state of the battery core 21 and maintain each battery cell, prevent the battery from being overcharged or overdischarged, and prolong the service life of the battery.

In some embodiments, the metal sheet 50 is provided with a plurality of limiting holes 501, the plurality of limiting holes 501 are spaced apart, and a tab of the battery cell is mounted in one of the limiting holes 501.

In some embodiments, in order to limit and fix the plurality of battery cells 21, the battery cell assembly 20 further includes a battery cell support 22, where the battery cell support 22 is disposed in the battery cavity 10a, and the battery cell support 22 is at least partially abutted to the inner wall of the housing 10, and a plurality of limit grooves are disposed on the battery cell support 22, and one of the battery cells is mounted in one of the limit grooves. Optionally, the battery cavity 10a is partitioned by the battery cell support 22 to form a first space 10aa and a second space 10ab, the first space 10aa is communicated with the through hole 10b, the battery cell support 22 is located in the first space 10aa, the second space 10ab is formed by a preset distance between one end of the battery cell support 22 and a side wall of the battery cavity 10a, the second space 10ab can be used for accommodating other electronic components except the battery cell assembly 20, and at least a part of heat generated by the battery cell can flow into the second space 10ab, so that excessive heat is prevented from accumulating in the first space 10 aa.

In some embodiments, a plug post 221 further extends on one side of the battery cell support 22, and a plug hole 701 is provided on the control circuit board 70, and the plug post 221 is plugged in the plug hole 701, so as to fix the control circuit board 70 on one side of the battery cell support 22.

For the heat conducting member 30 and the insulating sheet 60, as shown in fig. 1, one side of the heat conducting member 30 is attached to one side of the plurality of battery cells facing away from the bottom of the battery cavity 10a, the other side of the heat conducting member 30 is attached to the heat dissipating member 40, the insulating sheet 60 is attached to the other side of the heat conducting member 30, and the insulating sheet 60 is located between the heat conducting member 30 and the heat dissipating member 40. The heat conducting member 30 may conduct heat generated by the plurality of electric cells to the heat dissipating member 40, and conduct the heat to the outside air through the heat dissipating member 40, thereby dissipating heat from the plurality of electric cells. Optionally, the heat conducting member 30 is a heat conducting silicone paste, and the insulating sheet 60 may enhance the hardness of the heat conducting member 30, so as to prevent the heat conducting member 30 from being crushed to cause a short circuit of the battery.

As shown in fig. 2 and 5, the heat dissipation element 40 is disposed on the other side of the heat conduction element 30, and the heat dissipation element 40 at least partially protrudes from the through hole 10b, and along the second direction, the heat dissipation element 40 coincides with the projections of the plurality of electric cells and the heat conduction element 30, and the heat generated by the plurality of electric cells can be conducted to the outside air through the heat dissipation element 40.

It should be noted that: the first direction refers to the longitudinal direction of the housing 10, the second direction refers to the direction perpendicular to the bottom of the battery chamber 10a, and the second direction is perpendicular to the first direction.

In some embodiments, the heat dissipation element 40 includes a base 401 and a plurality of heat dissipation fins 402, one side of the base 401 abuts against the insulating sheet 60, the plurality of heat dissipation fins 402 are disposed at intervals on the other side of the base 401, a heat dissipation channel is formed between adjacent heat dissipation fins 402 at intervals, and heat generated by the plurality of electric cores can be transmitted to the air through the heat conduction element 30 and the insulating sheet 60 and from the heat dissipation channel. The heat sink 402 increases the contact area between the heat sink 40 and the ambient air, thereby facilitating faster conduction of heat from the heat sink to the air for heat dissipation.

In some embodiments, to accelerate the flow of heat in the heat dissipation channel, a fan or other devices for accelerating the flow of air may be further disposed on one side of the heat dissipation channel, so as to improve the flow of gas in the heat dissipation channel and improve the heat dissipation efficiency of the heat dissipation element 40.

In some embodiments, the heat dissipation element 40 is detachably connected to the heat conduction element 30 and the cell support 22, and the heat dissipation element 40 may pass through a screw or a rivet or other connection structure, and pass through the heat conduction element 30 until being connected to the cell support 22. When the heat sink 40 needs to be repaired or another size heat sink 40 needs to be replaced, the heat sink 40 can be detached from the cell holder 22 by unscrewing the screws or rivets thereon.

Referring to fig. 6 and fig. 7, in the present application, the conduction paths of the heat generated by the plurality of electric cells 21 in the battery cavity 10a are: the heat generated by the battery cell 21 is at least partially conducted through the metal sheet 50, the heat conducting member 30, the insulating sheet 60, the heat dissipating member 40, and finally conducted to the outside air through the heat dissipating member 40.

For convenience of explanation of the effect of the heat dissipation element 40, a cell located at the center of the battery cavity 10a is defined as a center cell, a cell close to the side wall of the battery cavity 10a is defined as an edge cell, and a temperature difference between the center cell and the heat dissipation element 40 is large, and a temperature difference between the edge cell and the heat dissipation element 40 is small, because part of heat of the edge cell can be conducted into the outside air through the housing 10 to achieve heat dissipation.

It should be noted that: because the temperature of the center cell of the battery pack is higher, when the temperature difference between the center cell and the heat dissipation member 40 increases, heat of the center cell is conducted to the heat dissipation member 40 more quickly according to a fourier conduction formula q=λa Δt/δ, wherein the larger the temperature difference Δt is, the higher the heat transfer efficiency is, the heat of the center cell is conducted to the heat dissipation member 40, the heat dissipation member 40 is made of a metal material, the heat conduction coefficient is high, and the heat transferred to the heat dissipation member 40 is spread out rapidly, and the contact between the heat and air is increased through a heat dissipation channel thereon. According to the fourier conduction formula, the temperature difference between the center cell with high temperature and the heat sink 40 is large, the heat dissipation efficiency is high, and the heat dissipation efficiency of the edge cell with low temperature is low, so that the temperature difference between the cells at different positions and the heat sink 40 tends to be consistent, the temperature difference between the cells at different positions is reduced, and the effect of uniform temperature is achieved.

In the embodiment of the present utility model, a housing 10, a battery cell assembly 20, a heat conductive member 30, and a heat dissipation member 40 are provided. The casing 10 is provided with a battery cavity 10a and a through hole 10b communicated with the battery cavity 10a, the battery cell assembly 20 is accommodated in the battery cavity 10a, the battery cell assembly 20 comprises a plurality of battery cells stacked along a first direction, one side of the heat conducting piece 30 is attached to one side of the plurality of battery cells deviating from the bottom of the battery cavity 10a, the heat radiating piece 40 is arranged on the other side of the heat conducting piece 30, at least part of the heat radiating piece 40 extends out from the through hole 10b, along a second direction, the heat radiating piece 40 is overlapped with the plurality of battery cells and the projection of the heat conducting piece 30, the second direction is perpendicular to the first direction, the heat generated by the plurality of battery cells can be transmitted to the heat radiating piece 40 through the heat radiating piece 30, and the heat radiating piece 40 is transmitted to the outside air, so that the heat dissipation of the battery cells at different positions is realized, the situation that the temperature difference of the battery cells at different positions is large is reduced, the battery pack performance is prevented from being damaged due to the temperature difference of the battery cells, and the service life of the battery pack is prolonged.

The utility model also provides an embodiment of an energy storage power supply, which comprises the battery pack, wherein the energy storage power supply comprises, but is not limited to, a two-wheeled electric vehicle, energy storage equipment, a handheld electric tool and the like, and the functions and the structures of the battery pack can be referred to the above embodiment and are not repeated herein.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.

Claims (10)

1. A battery pack, comprising:

the shell is provided with a battery cavity and a through hole communicated with the battery cavity;

the battery cell assembly is accommodated in the battery cavity and comprises a plurality of battery cells stacked along a first direction;

the heat conducting piece is attached to one side of the battery cells, which is away from the bottom of the battery cavity, at one side of the heat conducting piece;

The heat dissipation piece is arranged on the other side of the heat conduction piece, and at least part of the heat dissipation piece extends out of the through hole; the heat dissipation part is overlapped with the projections of the plurality of battery cores and the heat conduction part along a second direction, and the second direction is perpendicular to the first direction.

2. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,

Each cell includes an electrode assembly, a cell housing for housing the electrode assembly, and a tab electrically connected to the electrode assembly;

The battery pack comprises a metal sheet, wherein the metal sheet is attached to the lugs of the plurality of battery cells and is used for realizing series connection or parallel connection among the plurality of battery cells, and a connecting part is arranged on the metal sheet;

The battery pack also comprises a control circuit board, wherein the control circuit board is arranged in the battery cavity, and the control circuit board is electrically connected with the connecting part.

3. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,

The heat conducting piece comprises an insulating piece, wherein the insulating piece is attached to the other side of the heat conducting piece, and the insulating piece is located between the heat conducting piece and the heat radiating piece.

4. The battery pack of claim 3, wherein the battery pack comprises a plurality of battery cells,

The heat dissipation piece comprises a base and a plurality of heat dissipation fins, one side of the base is abutted to the insulating fins, the heat dissipation fins are arranged on the other side of the base at intervals, a heat dissipation channel is formed between the adjacent heat dissipation fins at intervals, and heat generated by the battery cells can pass through the heat conduction piece and the insulating fins and is transmitted to the air from the heat dissipation channel.

5. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,

The shell comprises a bottom shell and an upper cover, the battery cavity is located on the bottom shell, an opening for communicating the battery cavity is formed in the shell, the upper cover is covered on the opening, the upper cover is detachably connected with the bottom shell, and the through hole is located in the upper cover.

6. The battery pack of claim 5, wherein the battery pack comprises a plurality of battery cells,

The bottom shell is provided with a connecting column, and the connecting column is provided with a first screw hole;

The upper cover is provided with a second screw hole which is opposite to the first screw hole;

The shell further comprises a connecting screw, and one end of the connecting screw penetrates through the second screw hole to be screwed into the first screw hole.

7. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,

The battery cell assembly comprises a battery cell support, the battery cell support is arranged in the battery cavity, the battery cell support is at least partially abutted to the inner wall of the shell, a plurality of limiting grooves are formed in the battery cell support, and the battery cell is arranged in one of the limiting grooves.

8. The battery pack of claim 7, wherein the battery pack comprises a plurality of battery cells,

The battery cell support separates the battery cavity and forms first space and second space, first space with the through-hole intercommunication, the battery cell support is located first space, the second space by the one end of battery cell support with a side wall interval of battery cavity is predetermine the distance and is formed.

9. The battery pack of claim 7, wherein the battery pack comprises a plurality of battery cells,

And the heat dissipation piece is detachably connected with the heat conduction piece and the battery cell bracket.

10. An energy storage power supply comprising a battery pack according to any one of claims 1-9.