A battery pack structure in which all cells can be heat exchanged

Abstract

The present invention discloses a battery pack structure in which all battery cells can perform heat exchange, comprising a battery cell module, wherein the battery cell module comprises an end plate and a battery cell, two groups of the end plates are symmetrically spaced, and battery cell mounting holes for inserting ends of the battery cells are provided on the end plates, a number of the battery cells are respectively arranged in an array corresponding to each battery cell mounting hole between the two groups of end plates, and gaps between any two adjacent battery cells are arranged, so that a number of criss-cross gap channels are formed between the battery cells, and a number of conduction holes are provided on the end plates corresponding to the conduction of the gap channels; the core body of the battery cell performs heat exchange with the outside of the battery cell module through the gap channels and the conduction holes, and the battery cell gaps are arranged to form gap channels, and each battery cell is relatively independent and can perform heat exchange with gas in the surrounding area in all directions.

Description

Technical Field

[0001] The present invention belongs to the field of batteries, and in particular relates to a battery pack structure in which all battery cells can perform heat exchange. Background Art

[0002] Energy storage battery packs are used in various environments as portable power sources. During the use of the battery packs, the battery packs need to be cooled in high-temperature environments and heated and preheated in low-temperature environments. In energy storage battery packs, the battery shell is usually filled with a cell module, which is composed of several cells. There are certain shortcomings: since several cells are arranged in contact with each other, there is a lack of heat exchange channels between the cells, making it difficult for the several cells enclosed on the inside to dissipate heat or absorb heat with the outside area, which affects the performance of the cells. Therefore, in order to solve the above technical problems, this solution proposes a battery pack structure that can perform heat exchange on each cell in an all-round way. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a battery pack structure in which all battery cells can perform heat exchange. The gaps between the battery cells are arranged to form gap channels. Each battery cell is relatively independent and can perform heat exchange with the gas in the surrounding area in all directions.

[0004] Technical solution: To achieve the above purpose, the technical solution of the present invention is as follows:

[0005] A battery pack structure in which all battery cells can perform heat exchange, comprises a battery cell module, wherein the battery cell module comprises an end plate and a battery cell, two groups of the end plates are symmetrically arranged at intervals, the end plates are provided with battery cell mounting holes for inserting the ends of the battery cells, a plurality of the battery cells are arranged in an array between the two groups of end plates corresponding to the battery cell mounting holes, any two adjacent battery cells are arranged with gaps, a plurality of criss-cross gap channels are formed between the plurality of the battery cells, a plurality of conduction holes are provided on the end plates corresponding to the conduction of the gap channels; the core body of the battery cell performs heat exchange with the outside of the battery cell module through the gap channels and the conduction holes.

[0006] Furthermore, the intersection of the longitudinal and transverse gap channels constitutes a junction area, and the flow guide holes are opened corresponding to the junction area.

[0007] Furthermore, the guide holes include air inlet holes and exhaust holes. In the array direction, a number of the air inlet holes and a number of exhaust holes are distributed in an interspersed manner, and a negative pressure module is provided on the exhaust holes; the airflow in the intersection area corresponding to the air inlet holes passes through the gaps between the battery cells and enters the intersection area corresponding to the exhaust holes.

[0008] Furthermore, the negative pressure module is an exhaust fan.

[0009] Furthermore, some of the flow-conducting holes are only provided on one of the end plates.

[0010] Furthermore, the two end plates are each provided with a flow-conducting hole, and the flow-conducting holes on the two end plates are arranged correspondingly in the normal direction of the end plates.

[0011] Furthermore, in the normal direction of the end plate, two exhaust holes located in the same axial direction constitute two exhaust ports of the air flow channel, and the negative pressure module is arranged corresponding to any exhaust port of the exhaust channel.

[0012] Furthermore, a connecting piece is provided on the outer side surface of the end plate, and the connecting piece is arranged away from each flow guide hole.

[0013] Furthermore, the connection sheet is provided with an avoidance opening for avoiding the flow-conducting hole.

[0014] Beneficial effect: The battery cell gaps in the present invention are arranged to form gap channels, and each battery cell is relatively independent. Not only can the criss-cross gap channels exchange heat with the surrounding area, but also the conduction holes can exchange heat with the battery cells in the axial direction of the battery cells, so that each battery cell can exchange heat with the gas in the surrounding area in all directions. In a low temperature environment, the heat in the inner cavity of the battery shell can be used to quickly preheat the battery cell, or in a high temperature environment, the heat on the battery cell can be quickly diffused into the inner cavity of the battery shell, and the problem of uneven temperature of each battery cell on the battery cell module is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 It is a schematic diagram of the three-dimensional structure of the battery module of the present invention;

[0016] Attached Figure 2 It is a schematic diagram of the partial structure enlargement when the battery module of the present invention does not include a negative pressure module;

[0017] Attached Figure 3 It is a front view of the electrical module of the present invention;

[0018] Attached Figure 4 It is a schematic diagram of a half-section structure of the present invention;

[0019] Attached Figure 5 It is a schematic diagram of the structure enlargement of part B of the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] As attached Figure 1 and attached Figure 2As shown, a battery pack structure in which all battery cells can perform heat exchange includes a battery cell module, wherein the battery cell module includes an end plate 1 and a battery cell 2, the battery cell 2 is a cylindrical battery cell structure, two groups of the end plates 1 are symmetrically spaced, and battery cell mounting holes 4 for inserting the ends of the battery cells 2 are opened on opposite sides of the two end plates, and a plurality of the battery cells 2 are arranged between the two groups of end plates 1 corresponding to each battery cell mounting hole array, and the two end plates are used to mount a plurality of battery cells 2, and any gaps between any two adjacent battery cells are arranged, and a plurality of criss-cross gap channels are formed between the plurality of battery cells 2, and the gap channels include transverse gap channels 10a and longitudinal gap channels 10b, and a plurality of conduction holes 5 are opened on the end plate 1 corresponding to the conduction of the gap channels, and the core body of the battery cell 2 can perform heat exchange with the outside of the battery cell module through the gap channels and the conduction holes, that is, perform heat exchange with the gas in the inner cavity of the battery shell.

[0022] The intersection of the longitudinal and transverse gap channels constitutes an intersection area 20, and the conduction holes 5 are opened corresponding to the intersection area 20, that is, the inner area surrounded by four groups of battery cells. The battery cells on all sides can exchange heat with the enclosed area to ensure uniform heat exchange on all surfaces of the battery cells.

[0023] As attached Figure 1 To Attachment Figure 5 As shown, the flow guide holes 5 include air inlet holes 15 and exhaust holes 16. In the array direction, a number of the air inlet holes and a number of exhaust holes are interspersed, that is, in the longitudinal or transverse direction, an exhaust hole is included between two adjacent air inlet holes, and a negative pressure module 20 is provided on the exhaust hole 16 for extracting the air flow inside the battery cell module to the outside, and in the process of extracting the air flow, the external air flow enters the intersection area 21 from the air inlet hole, and the air flow in the intersection area 21 corresponding to the air inlet hole passes through the gap between the battery cells and enters the intersection area corresponding to the exhaust hole, thereby forming an air flow circulation in a small range, and forming multiple circulation areas on the battery cell module, which can greatly increase the heat exchange efficiency.

[0024] As attached Figure 5 It is a schematic diagram of the airflow direction between the intersection areas. The gaps between the two adjacent battery cells 2 constitute a throat-shaped airflow slit. Since the battery cell itself is a cylindrical structure, the intersection area corresponding to the air inlet hole changes from large to small in the airflow direction, and the intersection area corresponding to the exhaust hole changes from small to large in the airflow direction. When the airflow passes through the airflow slit, a jet phenomenon can be generated, thereby enabling the airflow to flow quickly and improving the circulation efficiency.

[0025] The negative pressure module includes two embodiments:

[0026] In the first embodiment, each of the exhaust holes 16 is provided with a negative pressure module, and in this case, the negative pressure module 20 is an exhaust fan.

[0027] In Example 2, each of the exhaust holes 16 is indirectly connected to the negative pressure module through an air pipe, so that the negative pressure module is set away from the end plate, reducing the impact of the negative pressure module itself on the battery cell when it is working. At this time, one end of the air pipe is connected to the exhaust hole, and the other end is connected to the negative pressure module. The negative pressure module can use an air pump or a high-power exhaust fan.

[0028] The opening of the flow-conducting holes includes two sets of embodiments:

[0029] In Embodiment 1, some of the guide holes 5 are only provided on one of the end plates, and no guide holes are provided on the other end plate, so as to reduce the airflow in the axial direction of the battery cell, thereby increasing the degree of airflow between the gaps between the battery cells.

[0030] In Embodiment 2, the two end plates 1 are provided with flow guide holes, and the flow guide holes on the two end plates are arranged correspondingly in the normal direction of the end plates. The two sets of flow guide holes can increase the axial air intake or exhaust speed. In the normal direction of the end plates, the two exhaust holes located in the same axial direction constitute two exhaust ports of the air flow channel, and the negative pressure module 20 is arranged corresponding to any exhaust port of the exhaust channel.

[0031] As attached Figure 1 To Attachment Figure 3 As shown, a connecting piece 3 is provided on the outer side of the end plate 1. The connecting piece is used for series or parallel battery cells. The connecting piece 3 is arranged to avoid each flow-conducting hole 5. Specifically, a avoiding opening 30 for avoiding the flow-conducting hole 5 is opened on the connecting piece 3 to ensure smooth intake and exhaust of the flow-conducting hole 5.

[0032] The battery cell gaps in the present invention are arranged to form gap channels, and each battery cell is relatively independent, and can not only exchange heat with the surrounding area through the criss-cross gap channels, but also form air flow circulation areas in multiple local areas through the conduction holes and the negative pressure device, and the circulating airflow can act on all peripheral walls of each battery cell, thereby eliminating dead corner areas, and all battery cells are completely connected to the gas in the inner cavity of the battery shell, so that each battery cell can exchange heat with the gas in the surrounding area in an all-round way. In a low temperature environment, the heat in the inner cavity of the battery shell can be used to quickly preheat the battery cell, and the heat is provided by the heating body in the inner cavity of the battery shell, or in a high temperature environment, the heat on the battery cell can be quickly diffused into the inner cavity of the battery shell, and the problem of uneven temperature of each battery cell on the battery cell module is also avoided.

[0033] The end plate 1 is provided with an end face through hole 7 corresponding to the battery cell mounting hole 4, and the end face of the battery cell can be connected to the external heat exchange groove to increase the end face heat dissipation area of ​​the battery cell, and the connecting piece 3 is connected to the polarity end of the battery cell through the end face through hole 7. The connecting piece 3 is used to connect several battery cells in series or in parallel, and because the connecting piece also generates a large amount of heat when the battery cell is discharged, arranging the connecting piece on the outside of the end plate can improve the overall heat dissipation effect and reduce the influence of the heat of the connecting piece 3 on the battery cell.

[0034] In addition, when air circulation is generated in the air inlet and the air outlet, air flow disturbance on the outer end surface of the end plate 1 can also be induced, thereby taking away the heat at the end of the battery cell.

[0035] The connecting sheet is provided with a plurality of connecting grooves 9 corresponding to the ends of the battery cells. The connecting sheet is welded to the ends of the battery cells at the connecting grooves. The generated welding point area is also located in the external heat exchange cavity. Since the resistance of the welding point area is relatively large, the heating area and the heat generation are large, by placing the welding point outside the battery cell and in the external heat exchange cavity, the end face of the battery cell and the welding point area can be quickly dissipated.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A battery pack structure in which all cells can be heat exchanged, Features: The invention comprises a battery cell module, wherein the battery cell module comprises an end plate and a battery cell, two groups of the end plates are arranged at a symmetrical interval, the end plates are provided with a battery cell mounting hole for inserting the end of the power core, a plurality of the battery cells are arranged in an array between the two groups of the end plates corresponding to each battery cell mounting hole, any two adjacent battery cells are arranged with gaps, a plurality of criss-cross gap channels are formed between the plurality of the battery cells, a plurality of conduction holes are provided on the end plates corresponding to the conduction of the gap channels; the core body of the battery cell performs heat exchange with the outside of the battery cell module through the gap channels and the conduction holes; The intersection of the longitudinal and transverse gap channels constitutes a junction area, and the flow-conducting holes are opened corresponding to the junction area; The guide holes include air inlet holes and exhaust holes. In the array direction, a plurality of the air inlet holes and a plurality of the exhaust holes are interlaced and distributed, and a negative pressure module is provided on the exhaust holes. The airflow in the intersection area corresponding to the air inlet holes passes through the gaps between the battery cells and enters the intersection area corresponding to the exhaust holes. A plurality of the flow-conducting holes are provided on and are only provided on one of the end plates.

2. A battery pack structure in which all battery cells can be heat exchanged according to claim 1, Features: The negative pressure module is an exhaust fan.

3. A battery pack structure in which all battery cells can be heat exchanged according to claim 1, Features: The outer side surface of the end plate is provided with a connecting piece, and the connecting piece is arranged away from each flow-conducting hole.

4. A battery pack structure in which all battery cells can be heat exchanged according to claim 3, Features: The connecting piece is provided with an avoidance opening for avoiding the flow-conducting hole.

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