CN218241973U

CN218241973U - Battery cell structure and battery pack

Info

Publication number: CN218241973U
Application number: CN202221959782.8U
Authority: CN
Inventors: 倪敏明; 侯春阳
Original assignee: Leedarson Lighting Co Ltd
Current assignee: Leedarson Lighting Co Ltd
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2023-01-06
Anticipated expiration: 2032-07-27

Abstract

The utility model belongs to the technical equipment field of the battery package heat dissipation, especially, relate to an electricity core structure and battery package. The battery cell structure comprises: the battery comprises an electric core, a bracket for supporting the electric core and a heat absorbing piece which is arranged opposite to the bracket and is made of a heat absorbing material, wherein the heat absorbing piece is provided with an avoiding groove, and one end of the electric core penetrates through the avoiding groove and is connected with the bracket; the battery cell is arranged on the support at intervals and is provided with a plurality of avoiding grooves corresponding to the positions of the battery cells, and the side surface of any battery cell abuts against the corresponding inner wall of each avoiding groove. The heat absorbing piece has a heat absorbing state and a heat dissipating state, when the heat absorbing piece is in the heat absorbing state, the electric core provides electric energy to the outside, and the heat absorbing piece absorbs heat from the electric core; when the heat absorbing member is in a heat dissipation state, the heat absorbing member dissipates the absorbed heat to the external space. The utility model discloses can reduce the temperature of electric core, guarantee electric core performance best performance, improve the work efficiency of electric core.

Description

Electricity core structure and battery package

Technical Field

The utility model belongs to the technical equipment field of the battery package heat dissipation, especially, relate to an electricity core structure and battery package.

Background

At present, the battery pack internal structure on the market generally comprises shell and electric core module, and the shell includes the casing and is connected the complex casing down with last casing. And the battery cell module mainly comprises a battery cell bracket, a nickel sheet, a battery cell and the like. When the battery core is charged and discharged, current can pass through the battery core, heat is generated, and therefore the temperature is increased.

However, if the cell temperature is too high, the performance and the service life of the cell are reduced, and even explosion can be caused. And along with the compacter and compacter of battery package structure, the heat dissipation of electricity core and battery package heat dissipation become the difficult problem that every producer faced.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide an electricity core structure, aim at solving and how to make the electricity core structure dispel the heat to improve the problem of the work efficiency of electricity core structure.

In order to achieve the purpose, the technical scheme adopted by the application is as follows:

in a first aspect, a cell structure is provided, which includes: the battery comprises an electric core, a bracket for supporting the electric core and a heat absorbing piece which is arranged opposite to the bracket and is made of heat absorbing materials, wherein the heat absorbing piece is provided with an avoiding groove, and one end of the electric core penetrates through the avoiding groove and is connected with the bracket; a plurality of battery cells are arranged on the bracket at intervals, the positions of the heat absorbing pieces corresponding to the battery cells are provided with the avoidance grooves, and the side surface of any one battery cell abuts against the inner wall of the corresponding avoidance groove; the heat absorbing piece has a heat absorbing state and a heat dissipating state, and when the heat absorbing piece is in the heat absorbing state, the heat absorbing piece absorbs and stores heat generated by the battery cell; when the heat absorbing member is in the heat dissipation state, the heat absorbing member dissipates the absorbed heat to an external space.

In some embodiments, the heat absorbing member is a heat absorbing member made of modified rubber.

In some embodiments, the shape of the cross section of the avoiding groove is circular or semicircular, and the inner wall of the avoiding groove at least partially wraps the battery cell along the circumferential direction of the battery cell.

In some embodiments, the battery cells are arranged on the support at intervals in multiple rows, and each battery cell in any two adjacent rows is arranged in a staggered manner.

In some embodiments, the support has positioning holes formed at positions corresponding to the battery cells, and one end of each battery cell is accommodated in each positioning hole.

In some embodiments, two brackets are provided, two ends of each electrical core are respectively connected to the two brackets, and the heat absorbing member is located between the two brackets.

In a second aspect, it is another object of the embodiments of the present application to provide a battery pack, which includes the cell structure described above.

In some embodiments, the battery pack further includes a casing structure having a holding cavity, the battery cell structure is held in the casing structure, the casing structure is provided with a first heat dissipation air inlet hole for air to flow into the holding cavity and a heat dissipation air outlet hole for air to flow out of the holding cavity, and the first heat dissipation air inlet hole and the heat dissipation air outlet hole are respectively located on two opposite surfaces of the casing structure.

In some embodiments, the shell structure includes an upper shell, a lower shell and an end cover, the upper shell and the lower shell together form a cavity with an opening at one end and a closed other end, the end cover is located at the opening and forms the accommodating cavity together with the upper shell and the lower shell, and the end cover is also provided with a second heat dissipation air inlet communicated with the accommodating cavity.

In some embodiments, two of the cell structures are provided, wherein one of the supports of one of the cell structures is stacked and abutted against one of the supports of the other cell structure, a heat dissipation channel for air to flow through and communicate with the heat dissipation air outlet is formed between the two supports, and each support is provided with an air passing channel; the battery cell structure is arranged opposite to the heat dissipation air outlet, and heat of each battery cell flows to the heat dissipation air outlet through the corresponding air passage and flows out of the accommodating cavity through the heat dissipation air outlet; and the other battery cell structure is arranged opposite to the second heat dissipation air inlet, and the heat of the battery cell flows into the heat dissipation channel through the corresponding air passing channel and flows out of the accommodating cavity through the heat dissipation air outlet.

The beneficial effect of this application lies in: all cladding has the heat absorbing material through the outer lane at electric core, is in operating condition at electric core, when discharging promptly, and the produced heat of electric core in the course of the work is absorbed and is stored and make the heat absorbing piece be in the heat absorbing condition by the heat absorbing piece to make the temperature of electric core reduce, can fully discharge, improved discharge efficiency. When the battery cell is in standing or charging, the heat of the heat absorbing piece is released. The cycle is repeated, the battery core is ensured to exert the best performance, and the working efficiency of the battery core is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the embodiments or exemplary technical descriptions will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts.

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

fig. 2 is an exploded schematic view of the battery pack of fig. 1;

fig. 3 is a schematic cross-sectional view of fig. 1 in a radial direction of a cell;

fig. 4 is a cross-sectional view along the axial direction of the cell of fig. 1;

fig. 5 is a schematic perspective view of a heat absorbing member according to an embodiment of the present application;

FIG. 6 is a perspective view of a stent according to another embodiment of the present application;

fig. 7 is a time-temperature curve of a cell in a further embodiment of the present application under different conditions;

fig. 8 is an exploded view of a battery pack in yet another embodiment of the present application.

Wherein, in the figures, the respective reference numerals:

100. a battery pack; 10. a housing structure; 11. a lower housing; 12. an upper housing; 13. an end cap; 14. an accommodating cavity; 15. an opening; 200. a battery cell structure; 201. a support; 202. an electric core; 203. a heat absorbing member; 204. a heat dissipation channel; 205. an avoidance groove; 206. an air passage; 111. a heat dissipation air outlet; 121. a first heat dissipation air inlet hole; 131. a second heat dissipation air inlet hole;

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application, and the specific meaning of the terms will be understood by those skilled in the art according to the particular situation. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.

Referring to fig. 1 to fig. 3, an embodiment of the present application provides a cell structure 200, where the cell structure 200 is capable of storing electric energy and providing electric energy to other electrical devices. The cell structure 200 includes: a cell 202, a support 201 for supporting the cell 202 and a heat sink 203 arranged opposite the support 201 and made of a heat sink material. It is understood that, in order to match the charging or discharging of the battery cell 202, the battery cell structure 200 is further provided with a circuit board, a controller and a nickel plate. In this embodiment, the cross-sectional shape of the battery cell 202 is a circle, and in other embodiments, the cross-sectional shape of the battery cell 202 may also be an ellipse or a polygon. Referring to fig. 4 to fig. 6, optionally, the heat absorbing member 203 is provided with an avoiding groove 205, and one end of the battery cell 202 penetrates through the avoiding groove 205 and is connected to the bracket 201; the electric cores 202 are arranged on the support 201 at intervals, the avoidance grooves 205 are formed in the positions, corresponding to the electric cores 202, of the heat absorbing pieces 203, the side surfaces of any electric core 202 abut against the inner walls of the corresponding avoidance grooves 205, namely, heat absorbing materials are filled between any two adjacent electric cores 202, and the filled heat absorbing materials are connected into a whole to form the heat absorbing pieces 203. In the present embodiment, the length direction of the battery cells 202 is arranged along the vertical direction, and it can be understood that the heat absorbing member 203 can also provide support for the lateral stability of the battery cells 202 by avoiding the groove 205, so that each battery cell 202 becomes a whole.

Referring to fig. 4 to fig. 6, optionally, the heat absorbing member 203 has a heat absorbing state and a heat dissipating state, when the heat absorbing member 203 is in the heat absorbing state, the heat absorbing member 203 absorbs heat generated by the battery cell 202, that is, the battery cell 202 provides electric energy to the outside and the heat absorbing member 203 absorbs heat from the battery cell 202; that is, when each of the battery cells 202 supplies electric energy to the outside to generate heat, the heat absorbing member 203 absorbs and stores the heat generated by each of the battery cells 202, so as to lower the temperature of each of the battery cells 202, maintain the proper operating temperature of each of the battery cells 202, and perform sufficient discharge. When the heat absorbing member 203 is in a heat dissipating state, the heat absorbing member 203 dissipates the absorbed heat to the external space. That is, when each of the battery cells 202 is in a non-operating state, such as a standing state or a charging state, the heat absorbing member 203 releases the stored heat to prepare for a next heat absorption.

Optionally, the battery cell 202 directly contacts the heat absorbing member 203 and conducts heat from the battery cell 202 to the heat absorbing member 203, and compared with heat conduction between the battery cell 202 and air, the heat conduction efficiency of the embodiment is higher, which is beneficial to heat dissipation and cooling of the battery cell 202. It is understood that, when the battery cell 202 is operated, most of the heat generated by the battery cell 202 is absorbed by the heat absorbing member 203, a small portion of the heat is radiated to the air or conducted to other structural components, and a portion of the heat absorbed by the heat absorbing member 203 is radiated to the air or conducted to other structural components.

By coating the outer ring of the battery cell 202 with the heat absorbing material, when the battery cell 202 is in a working state, that is, when discharging, heat generated by the battery cell 202 in the working process is absorbed by the heat absorbing member 203 and stored to enable the heat absorbing member 203 to be in a heat absorbing state, so that the temperature of the battery cell 202 is reduced, sufficient discharging can be performed, and the discharging efficiency is improved. When the battery cell 202 is static or charged, the heat of the heat absorbing member 203 is released. The cycle is repeated, the battery cell 202 is ensured to exert the best performance, and the working efficiency of the battery cell is improved.

Referring to fig. 1-3, in some embodiments, the heat absorbing member 203 is a heat absorbing member 203 made of modified rubber. Optionally, in this embodiment, the heat absorbing material is a high-efficiency heat absorbing material using modified rubber as a carrier, and the heat absorbing material has characteristics of high thermal conductivity, high specific heat capacity, high heat absorption enthalpy, low density, and a non-conductor, and is suitable for internal heat dissipation of the electrical core structure 200, so as to avoid problems of space increase and noise caused by heat dissipation by a fan.

Optionally, the gaps between the electric cores 202 can be filled with heat absorbing materials, so that heat transfer between the heating part and the radiating part is completed, the electric core structure has low density, large specific heat capacity, high resilience and high heat absorption value, can absorb heat surge and delay temperature rise, and meets the application requirements of high heat absorption value and long-term reliable heat in the limited space of the electric core structure 200. Optionally, in this embodiment, the heat conductivity coefficient of the heat absorbing material is 0.6 ± 0.3W/m.k, the specific heat capacity is 2.1J/(g ℃) and the heat absorption enthalpy is 50-100J/g, which are both higher than those of plastics such as nylon and ABS, and are beneficial to heat transfer and heat storage of the cell structure 200. And the specific gravity of the heat absorbing member 203 is only 1.3g/cm ³ And plastics (1.2 g/cm) ³ ) Metals which do not differ significantly but which have a high thermal conductivity, e.g. aluminium, 2.7g/cm ³ Much lower, adding little weight to the cell structure 200. Meanwhile, the heat absorbing material is a non-conductor, which is more suitable for heat conduction and heat storage inside the battery cell 202 than metal.

Optionally, the heat absorbing material is attached to the surface of the battery cell 202 to verify the effect of the heat absorbing material. The discharge time and temperature conditions of cells 202 # 1 to # 14 without adding a heat sink material are shown in the following table, wherein the temperatures of cells 202 # 3, # 5 and # 9 are highest at the same discharge time, the final temperatures of the three cells 202 are 74.97 ℃, 70.26 ℃ and 72.28 ℃, respectively, and the cell structure 200 is operated for 11 minutes and 48 seconds by discharging.

Referring to table 1 below, three cells 202 of # 3, # 5 and # 9 are bonded with a heat absorbing material, and similarly subjected to a 25A sustained discharge temperature rise and comparative test. The final temperatures of the three cells 202 are respectively 70.06 ℃, 63.09 ℃ and 62.93 ℃, the final temperatures are respectively reduced by 4.9 ℃,7.17 ℃ and 9.34 ℃, the whole discharge time lasts for 12 minutes and 09 seconds, the discharge time of 21 seconds is increased, and the discharge life of the cell structure 200 is prolonged.

Table 1: temperature rise comparison of battery pack in continuous discharge at room temperature

Referring to fig. 7, it can be seen from the temperature rise graph that, under the condition of consistent initial temperature, as the discharge duration increases, particularly after 5 minutes, the temperature curve 101 with the heat absorbing material attached thereto is significantly lower than the temperature curve 102 without the heat absorbing material attached thereto, and the discharge time is lengthened by 21 seconds, so that the discharge efficiency of the cell structure 200 is improved.

Referring to fig. 4 to 6, in some embodiments, the cross-sectional shape of the avoiding groove 205 is circular or semicircular, and an inner wall of the avoiding groove 205 at least partially wraps the battery cell 202 along the circumferential direction of the corresponding battery cell 202. Optionally, the inner wall of the avoidance groove 205 completely wraps the battery cell 202, or the inner wall of the avoidance groove 205 partially wraps the battery cell 202 to absorb heat generated by the battery cell 202 during the discharge process.

Referring to fig. 3, in some embodiments, the battery cells 202 are arranged on the support 201 at intervals in multiple rows, and each battery cell 202 in any two adjacent rows is arranged in a staggered manner. Optionally, in this embodiment, the battery cells 202 are arranged in three rows at intervals, and each row is arranged with a plurality of battery cells 202 at intervals. For any two adjacent rows, any one of the cells 202 in one row is located between two adjacent cells 202 in the other row, so that for a single row of cells 202, the distance between two adjacent cells 202 can be increased, the ventilation performance is improved, the flow of heat is facilitated, and the overall temperature of the cell structure 200 is reduced.

Referring to fig. 6, in some embodiments, the support 201 has positioning holes at positions corresponding to the battery cells 202, and one end of each battery cell 202 is received in each positioning hole. Optionally, the shape of the positioning hole is adapted to the shape of the battery cell 202, and the battery cell 202 is radially fixed, so as to improve the stability of the battery cell 202.

Referring to fig. 2, in some embodiments, two supports 201 are provided, two ends of each battery cell 202 are respectively connected to the two supports 201, and the heat absorbing member 203 is located between the two supports 201. The battery cell 202 can be axially fixed by the two brackets 201, so that the stability of the battery cell 202 is improved.

Referring to fig. 1, fig. 2 and fig. 8, the present invention further provides a battery pack 100, where the battery pack 100 includes an electrical core structure 200, and the specific structure of the electrical core structure 200 refers to the above embodiments, and since the battery pack 100 adopts all technical solutions of all the above embodiments, all beneficial effects brought by the technical solutions of the above embodiments are also achieved, and are not repeated herein.

In some embodiments, the battery pack 100 further includes a casing structure 10 having a receiving cavity 14, the cell structure 200 is received in the casing structure 10, the casing structure 10 defines a first heat dissipation air inlet 121 for air to flow into the receiving cavity 14 and a heat dissipation air outlet 111 for air to flow out of the receiving cavity 14, and the first heat dissipation air inlet 121 and the heat dissipation air outlet 111 are respectively located on two opposite surfaces of the casing structure 10.

It can be understood that the air flows into the accommodating chamber 14 from the heat dissipation ventilating openings, and flows through each of the battery cells 202 and the heat absorbing members 203, and takes away the heat of the battery cells 202 and the heat of the heat absorbing members 203, so as to lower the temperature of the battery cells 202 and the heat absorbing members 203, and the air flows out of the accommodating chamber 14 from the heat dissipation ventilating openings 111. The external air can naturally flow into and out of the receiving chamber 14, or flow into and out of the receiving chamber 14 under the driving of an external driving mechanism.

Referring to fig. 2 to 4, in some embodiments, the housing structure 10 includes an upper housing 12, a lower housing 11, and an end cover 13, where the upper housing 12 and the lower housing 11 together form a cavity having an opening 15 at one end and a closed end at the other end, and optionally, edges of the upper housing 12 and the lower housing 11 are butted by a seam allowance structure, so as to improve sealing performance. The end cover 13 is located at the opening 15 and forms an accommodating cavity 14 together with the upper shell 12 and the lower shell 11, and the end cover 13 is also provided with a second heat dissipation air inlet hole 131 communicated with the accommodating cavity 14. Optionally, the airflow flows into the accommodating chamber 14 through the first heat dissipating air inlet holes 121 and the second heat dissipating air inlet holes 131 and flows through the electrical structure, so as to take away the heat of the battery cell 202 and the heat of the heat absorbing member 203, so as to reduce the temperature of the battery cell 202 and the heat absorbing member 203, and the airflow flows out of the accommodating chamber 14 through the heat dissipating air outlet holes 111.

Referring to fig. 2 to 4, in some embodiments, two cell structures 200 are provided, wherein one support 201 of one cell structure 200 is stacked and abutted against one support 201 of another cell structure 200, a heat dissipation channel 204 is formed between the two supports 201 for air to flow through and communicate with the heat dissipation air outlet 111, and each support 201 is provided with an air passing channel 206; one of the battery cell structures 200 is disposed opposite to the heat dissipation air outlet 111, and heat of each battery cell 202 flows to the heat dissipation air outlet 111 through the corresponding air passage 206, and flows out of the accommodating cavity 14 through the heat dissipation air outlet 111; the other cell structure 200 is disposed opposite to the second heat dissipation air inlet 131, and heat of the cell 202 flows into the heat dissipation channel 204 through the corresponding air passing channel 206 and flows out of the accommodating cavity 14 through the heat dissipation air outlet 111. It can be understood that, the interval between each support 201 and the inner wall of the accommodating cavity 14 is set, so as to improve the ventilation performance of the cell structure 200. Optionally, the air passage 206 is provided in plurality at intervals.

Referring to fig. 3, optionally, the two electrical structures are stacked in a vertical direction, the lower cell structure 200 is disposed near the first heat dissipation air inlet hole 121, the upper cell structure 200 is disposed near the second heat dissipation air inlet hole 131, and air flows into the accommodating cavity 14 from the first heat dissipation air inlet hole 121, flows through the corresponding electrical structure, flows to the heat dissipation air outlet hole 111 through the air passage 206 on the bracket 201, and flows out of the accommodating cavity 14 through the heat dissipation air outlet hole 111, so as to effectively dissipate heat of the cell structure 200, as shown by arrows in fig. 3.

Referring to fig. 4, optionally, air flows into the accommodating cavity 14 from the second heat dissipation air inlet 131 and flows through the corresponding battery cell structure 200, then flows into the heat dissipation channel 204 through the air passage 206 on the corresponding bracket 201, then flows from the heat dissipation channel 204 to the heat dissipation air outlet 111, and flows out of the accommodating cavity 14 through the heat dissipation air outlet 111, so as to perform effective heat dissipation on the battery cell structure 200, as shown by the arrows in fig. 4.

It can be understood that the first heat dissipation air inlet hole 121, the second heat dissipation air inlet hole 131 and the heat dissipation air outlet hole 111 are arranged in plurality at intervals. Optionally, the first heat dissipation air inlet hole 121, the second heat dissipation air inlet hole 131 and the heat dissipation air outlet hole 111 are all provided with a filter screen, and the filter screen is connected with the inner wall of the accommodating cavity 14.

The above are merely alternative embodiments of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art to which the present application pertains. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A cell structure, comprising: the battery comprises an electric core, a bracket for supporting the electric core and a heat absorbing piece which is arranged opposite to the bracket and is made of a heat absorbing material, wherein the heat absorbing piece is provided with an avoidance groove, and one end of the electric core penetrates through the avoidance groove and is connected with the bracket; a plurality of the battery cells are arranged on the bracket at intervals, the positions of the heat absorbing pieces corresponding to the battery cells are provided with the avoidance grooves, and the side surface of any battery cell abuts against the inner wall of the corresponding avoidance groove; the heat absorbing piece is provided with a heat absorbing state and a heat radiating state, and when the heat absorbing piece is in the heat absorbing state, the heat absorbing piece absorbs and stores heat generated by the battery cell; when the heat absorbing member is in the heat dissipation state, the heat absorbing member dissipates the absorbed heat to an external space.

2. The cell structure of claim 1, wherein: the heat absorbing member is made of modified rubber.

3. The cell structure of claim 1, wherein: the cross section of the avoiding groove is circular or semicircular, and the inner wall of the avoiding groove is at least partially wrapped on the battery cell along the corresponding circumferential direction of the battery cell.

4. The cell structure of claim 1, wherein: the battery cells are arranged on the support at intervals in multiple rows, and the battery cells in any two adjacent rows are arranged in a staggered manner.

5. The cell structure of claim 1, wherein: the bracket is provided with positioning holes corresponding to the positions of the battery cores, and one end of each battery core is contained in each positioning hole.

6. The cell structure of any of claims 1-5, wherein: the battery is characterized in that the number of the supports is two, two ends of each battery cell are respectively connected with the two supports, and the heat absorbing piece is located between the two supports.

7. A battery pack comprising the cell structure of claim 6.

8. The battery pack according to claim 7, wherein: the battery pack is characterized by further comprising a shell structure with a containing cavity, the electric core structure is contained in the shell structure, the shell structure is provided with a first heat dissipation air inlet hole and a second heat dissipation air outlet hole, the first heat dissipation air inlet hole and the second heat dissipation air outlet hole are respectively located on two surfaces, back to back, of the shell structure, and air flows into the containing cavity through the first heat dissipation air inlet hole and the second heat dissipation air outlet hole.

9. The battery pack according to claim 8, wherein: the shell structure includes casing, casing and end cover down, go up the casing with casing forms the one end jointly down and has opening and other end confined cavity, the end cover is located the opening part and with go up the casing with casing forms jointly down the holding chamber, just the intercommunication has also been seted up to the end cover the second heat dissipation fresh air inlet in holding chamber.

10. The battery pack according to claim 9, wherein: the battery cell structure is provided with two battery cell structures, one support of one battery cell structure is stacked and abutted with one support of the other battery cell structure, a heat dissipation channel for air to flow through and communicated with the heat dissipation air outlet hole is formed between the two supports, and each support is provided with an air passing channel; the battery cell structure is arranged opposite to the heat dissipation air outlet, and heat of each battery cell flows to the heat dissipation air outlet through the corresponding air passage and flows out of the accommodating cavity through the heat dissipation air outlet; and the other battery cell structure is arranged opposite to the second heat dissipation air inlet, and the heat of the battery cell flows into the heat dissipation channel through the corresponding air passing channel and flows out of the accommodating cavity through the heat dissipation air outlet.