A battery pack

Abstract

The present invention provides a battery pack, comprising: a cell assembly, the cell assembly comprising a cell array composed of a plurality of cells arranged in sequence and a gap arranged in the cell array; the gap is surrounded by N cells, N>2; and a heat dissipation assembly, the heat dissipation assembly comprising a heat absorbing member arranged in the gap, the heat absorbing member comprising N side walls, the N side walls respectively abutting against the side walls of the N cells. Compared with the prior art, the battery pack of the present invention assists the cell assembly in heat dissipation through the heat dissipation assembly, which can not only make the temperature of each area of ​​the cell assembly more balanced, but also effectively extend the working time of the cell assembly, reduce the attenuation rate of the cell assembly, thereby effectively extending the service life of the battery pack.

Description

Technical Field

[0001] The invention relates to a battery pack. Background Art

[0002] A battery pack usually includes a shell, a battery cell assembly disposed in the shell, and a circuit board that controls the charge and discharge state of the battery pack. In order to make the battery pack waterproof, the battery cell assembly is usually placed in a closed space. However, during the use of the battery pack, the battery cell assembly will continuously release heat. When the temperature of the battery cell assembly reaches the battery cell thermal protection temperature value, the battery pack will stop discharging under the control of the circuit board.

[0003] The existing battery cell assembly is usually composed of a plurality of battery cells in an array. The battery cells at the edge of the array dissipate heat faster, while the battery cells at the center of the array dissipate heat slower or even fail to dissipate heat effectively, so that the central battery cell of the battery cell assembly reaches the battery cell thermal protection temperature value the fastest, thereby triggering the battery pack protection mechanism, and the circuit board controls the battery pack to stop discharging, which in turn affects the normal use of the battery pack and reduces the user experience.

[0004] In view of the above problems, it is necessary to provide a battery pack to solve the above problems. Summary of the invention

[0005] An object of the present invention is to provide a battery pack, which assists the heat dissipation of a battery cell assembly through a heat dissipation assembly, which can not only make the temperature of each area of ​​the battery cell assembly more balanced, but also effectively extend the working time of the battery cell assembly and reduce the attenuation rate of the battery cell assembly, thereby effectively extending the service life of the battery pack.

[0006] To achieve the above-mentioned purpose, the present invention provides a battery pack, comprising: a battery cell assembly, the battery cell assembly comprising a battery cell array composed of a plurality of battery cells arranged in sequence and a gap arranged in the battery cell array; the gap is surrounded by N battery cells, N>2; and a heat dissipation assembly, the heat dissipation assembly comprising a heat absorbing member arranged in the gap, the heat absorbing member comprising N side walls, and the N side walls respectively abut against the side walls of the N battery cells.

[0007] As a further improvement of the present invention, the heat dissipation assembly includes a heat conductive member in contact with the heat absorbing member to guide out the heat absorbed by the heat absorbing member.

[0008] As a further improvement of the present invention, the heat conducting member is arranged along the axial direction of the battery core, with a portion of the heat conducting member being located inside the heat absorbing member and a portion of the heat conducting member being located outside the heat absorbing member.

[0009] As a further improvement of the present invention, the heat conducting member comprises a shaft body arranged along the axial direction of the battery core and a plurality of heat dissipation fins arranged on the shaft body; the heat dissipation fins are arranged on the arc-shaped side wall of the shaft body.

[0010] As a further improvement of the present invention, the heat conducting component includes a cylinder provided with a receiving groove and a plurality of heat dissipating fins; the receiving groove is arranged along the axial direction of the cylinder, one end of the heat dissipating fin is installed on the groove wall of the receiving groove, and the other end protrudes into the receiving groove; the heat absorbing component is provided with a receiving cavity for receiving the cylinder.

[0011] As a further improvement of the present invention, the battery pack further includes a shell for accommodating the battery cell assembly and the heat dissipation assembly, and the heat conductive member is in contact with the shell.

[0012] As a further improvement of the present invention, the battery pack further comprises a shell for accommodating the battery cell assembly and the heat dissipation assembly, and the shell is provided with ventilation holes that cooperate with the heat dissipation assembly.

[0013] As a further improvement of the present invention, the heat absorbing element is a shaped phase-variant.

[0014] As a further improvement of the present invention, the heat absorption component includes a phase changer and a heat conductive shell accommodating the phase changer.

[0015] The present invention also discloses a battery pack, comprising a plurality of battery cells, a battery cell rack and a heat dissipation assembly, wherein the battery cell rack is provided with a receiving groove to accommodate the battery cells; the receiving groove comprises a first receiving groove for accommodating N battery cells; the heat dissipation assembly comprises a heat absorbing member arranged in the first receiving groove, the heat absorbing member comprises N side walls, the N side walls respectively support the N battery cells accommodated in the first receiving groove, and the N battery cells are located between the heat absorbing member and the side walls of the first receiving groove, and N>2.

[0016] As a further improvement of the present invention, the heat dissipation assembly includes a heat conductive member in contact with the heat absorbing member to guide out the heat absorbed by the heat absorbing member.

[0017] As a further improvement of the present invention, the heat conducting member is arranged along the axial direction of the battery core, with a portion of the heat conducting member being located inside the heat absorbing member and a portion of the heat conducting member being located outside the heat absorbing member.

[0018] As a further improvement of the present invention, the heat conducting member comprises a shaft body arranged along the axial direction of the battery core and a plurality of heat dissipation fins arranged on the shaft body; the heat dissipation fins are arranged on the arc-shaped side wall of the shaft body.

[0019] As a further improvement of the present invention, the heat conducting component includes a cylinder provided with a receiving groove and a plurality of heat dissipating fins; the receiving groove is arranged along the axial direction of the cylinder, one end of the heat dissipating fin is installed on the groove wall of the receiving groove, and the other end protrudes into the receiving groove; the heat absorbing component is provided with a receiving cavity for receiving the cylinder.

[0020] The beneficial effect of the present invention is that the battery pack of the present invention assists the heat dissipation of the battery cell assembly through the heat dissipation assembly, which can not only make the temperature of each area of ​​the battery cell assembly more balanced, but also effectively extend the working time of the battery cell assembly and reduce the attenuation rate of the battery cell assembly, thereby effectively extending the service life of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the battery pack of the present invention.

[0022] Figure 2 yes Figure 1 Exploded perspective view of the battery pack shown.

[0023] Figure 3 It is a cross-sectional view of the battery cell assembly and the heat dissipation assembly when they are matched.

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the battery frame.

[0025] Figure 5 It is a schematic diagram of the three-dimensional structure of the battery cell array.

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure when the battery cell array and the heat dissipation components are coordinated.

[0027] Figure 7 It is a three-dimensional structural schematic diagram of the heat dissipation component.

[0028] Figure 8 It is a schematic diagram of the three-dimensional structure of a shell and a heat dissipation component of a second embodiment.

[0029] Fig. 9 It is a schematic diagram of the three-dimensional structure of a shell and a heat dissipation component of a third embodiment.

[0030] Fig.10 It is a schematic diagram of the three-dimensional structure of the heat dissipation component of the fourth embodiment.

[0031] Fig.11 It is a schematic diagram of the three-dimensional structure of the heat dissipation component of the fifth embodiment.

[0032] Fig.12 This is a schematic diagram of the second structure of the battery cell array.

[0033] Fig.13This is a schematic diagram of the third structure of the battery cell array. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] See also Figure 1 as well as Figure 2 As shown, the present invention discloses a battery pack 100, including a shell 10, a battery cell assembly 20, a heat dissipation assembly 30 matched with the battery cell assembly 20, and a circuit board 40 for controlling the charging and discharging state of the battery pack 100, and the battery cell assembly 20, the heat dissipation assembly 30 and the circuit board 40 are accommodated in the shell 10.

[0036] See also Figure 1 as well as Figure 2 As shown, the housing 10 includes a top wall 11, a top wall 12 disposed opposite to the top wall 11, and a side wall 13 perpendicular to the top wall 11. The top wall 11, the bottom wall 12, and the side wall 13 are collectively arranged to form a receiving space to receive the battery cell assembly 20, the heat dissipation assembly 30, and the circuit board 40.

[0037] See also Figure 3 , Figure 4 as well as Figure 5 As shown, the battery cell assembly 20 includes a battery cell array 21 and a battery cell frame 22 for accommodating the battery cell array 21. Figure 5 As shown, the cell array 21 is formed by a plurality of cells 211 arranged in sequence. A gap 212 is provided in the cell array 21, and the gap 212 is formed by N cells 211, where N is an integer greater than 2. In this embodiment, N is 6. Figure 5 as well as Figure 6 As shown, in fact, the gap 212 in this embodiment is formed after one of the cells 211 in the cell array 21 is left blank, that is, the cell 211 at the highest heat point in the cell array 21 is taken out. Providing the heat dissipation assembly 30 at the highest heat point in the cell array 21 can not only quickly reduce the internal temperature of the battery pack 100, but also this cooling method is the most efficient and effective. Of course, the gap 212 can also be in other structural forms. For example, Fig.12 A gap 212' (dashed line portion) formed by three battery cells 211 is shown; Fig.132 shows a gap 212 surrounded by four battery cells 211" (dashed line portion). In this embodiment, the battery cell array 21 is provided with one gap 212, but in other embodiments, the specification and quantity of the gap 212 can be set as needed. For example, the battery cell array 21 is provided with two gaps 212 or a plurality of gaps 212, such as Fig.12 , Fig.13 As shown. It can be understood that, in this embodiment, the cross-section of the battery cell 211 is circular, but in other embodiments, the cross-section shape of the battery cell 211 can be set as needed, for example: a regular polygon. Figure 4 As shown, the cell frame 22 is provided with a receiving slot 221 to receive the cell array 21. The receiving slot 221 includes a first receiving slot 2211 and a second receiving slot 2212. The first receiving slot 2211 is used to receive the N cells 211 and the gap 212 surrounded by the N cells 211. The second receiving slot 2212 is used to receive a single cell 211. In this embodiment, the second receiving slot 2212 is used to receive a single cell, but in other embodiments, the second receiving slot 2212 can also be configured to receive multiple cells. In this embodiment, the receiving slot 221 has two specifications: a first receiving slot 2211 for receiving six cells and a second receiving slot 2212 for receiving a single cell, but in other embodiments, the specifications of the receiving slot 221 can be set in multiple ways as needed, for example: one receiving slot for receiving six cells, one receiving slot for receiving three cells, and multiple receiving slots for receiving a single cell.

[0038] See also Figure 6 as well as Figure 7As shown, the heat sink 30 is accommodated in the gap 212, and includes a heat absorbing member 31 and a heat conductive member 32 in contact with the heat absorbing member 31. The heat absorbing member 31 includes N side walls 311, and the N side walls 311 respectively abut against the side walls of the N battery cells 211, so that the heat absorbing member 31 absorbs heat from the N battery cells 211, so that the battery cells 211 can quickly dissipate heat and cool down. In this embodiment, the side wall 311 is an arc-shaped wall, and its curvature matches the curvature of the side wall of the battery cell 211. In this embodiment, the heat absorbing member 31 is a shaped phase change body made of a shaped phase change material. However, in other embodiments, the heat absorbing member 31 may also include a phase change body and a heat conductive shell for accommodating the phase change body; the phase change body may be made of a shaped phase change material or an amorphous phase change material, and the heat conductive shell is made of a material with high thermal conductivity. It is understandable that the heat absorbing member 31 can also be made of other materials that can achieve the heat absorption function, and the present invention does not impose specific restrictions on this. The heat conductive member 32 is used to guide the heat absorbed by the heat absorbing member 31 and dissipate it into the external environment. The heat conductive member 32 can be made of metal, high thermal conductivity plastic, ceramic and other materials. The heat conductive member 32 is arranged along the axial direction of the battery core 211, and part of it is located inside the heat absorbing member 31 and part of it is located outside the heat absorbing member 31. In this embodiment, the heat conductive member 32 is cylindrical and passes through the heat absorbing member 31 along the axial direction of the battery core 211; the two ends of the heat conductive member 32 can be in contact with the top wall 11 and the bottom wall 12 respectively, or they may not be in contact with the top wall 11 and the bottom wall 12. When the materials of the heat absorbing member 31 and the heat conductive member 32 are the same, the heat absorbing member 31 and the heat conductive member 32 can also be integrally formed. In this embodiment, the cross section of the heat conducting member 32 is circular, but in other embodiments, the cross section of the heat conducting member 32 can be designed as required, and the present invention does not impose any specific limitation on this.

[0039] Figure 8 The heat dissipation component 50 of the second embodiment is shown. The heat dissipation component 50 includes a heat absorbing member 51 and a heat conductive member 52 in contact with the heat absorbing member 51. The structure of the heat absorbing member 51 is the same as that of the heat absorbing member 31. The heat conductive member 52 includes a first heat conductive member 521 and a second heat conductive member 522. One end of the first heat conductive member 521 is fixed to the top wall 11, and the other end is inserted into the heat absorbing member 51; one end of the second heat conductive member 522 is fixed to the bottom wall 12, and the other end is inserted into the heat absorbing member 51. In this embodiment, the heat conductive member 52 is a split type, but it can be understood that in other embodiments, the first heat conductive member 521 and the second heat conductive member 522 can form a whole, and one end is fixed to the top wall 11 or the bottom wall 12, and the other end is inserted into the heat absorbing member 51.

[0040] Fig. 9The third embodiment of the heat dissipation assembly 60 is shown. The heat dissipation assembly 60 has a substantially similar structure to the heat dissipation assembly 50, including a heat absorbing member 61 and a heat conducting member 62 in contact with the heat absorbing member 61, but the difference is that the heat conducting member 62 is a heat conducting sheet.

[0041] Fig.10 The heat dissipation component 70 of the fourth embodiment is shown. The heat dissipation component 70 includes a heat absorbing member 71 and a heat conducting member 72 in contact with the heat absorbing member 71. The heat absorbing member 71 has the same structure as the heat absorbing member 31, and is provided with a receiving cavity 711. The heat conducting member 72 includes a hollow cylinder 721 and a plurality of heat dissipation fins 722. The cylinder 721 is disposed in the receiving cavity 711 and abuts against the groove wall of the receiving cavity 711. The cylinder 721 is provided with a receiving groove 7211. One end of the heat dissipation fin 722 is mounted on the groove wall of the receiving groove 7211, and the other end protrudes into the receiving groove 7211. It can be understood that in other embodiments, the heat conducting member 72 may not have the cylinder 721, and the heat dissipation fin 722 is directly mounted on the groove wall of the receiving cavity 711. It is understandable that the top wall 11 and the bottom wall 12 may also be provided with ventilation holes (not shown) that cooperate with the heat dissipation assembly 70 so as to dissipate heat through air convection.

[0042] Fig.11 The heat dissipation component 80 of the fifth embodiment is shown. The heat dissipation component 80 includes a heat absorbing member 81 and a heat conducting member 82 in contact with the heat absorbing member 81. The heat absorbing member 81 has a substantially same structure as the heat absorbing member 31, and is provided with a receiving cavity 811 to accommodate the heat conducting member 82. The heat conducting member 82 includes a shaft 821 arranged along the axial direction of the battery core 211 and a plurality of heat dissipation fins 822 arranged on the shaft 821. The heat dissipation fins 822 are arranged on the arc-shaped side wall of the shaft 821. In this embodiment, the plurality of heat dissipation fins 822 have a total of 8 rows, and the heat dissipation fins 822 in each row form a straight line parallel to the axis of the shaft 821. However, it can be understood that the line formed by the heat dissipation fins 822 in each row can also be a spiral line rotating around the shaft 821.

[0043] Compared with the prior art, the battery pack 100 of the present invention assists the heat dissipation of the battery cell assembly 20 through the heat dissipation components 30, 50, 60, 70, and 80, which can not only make the temperature of each area of ​​the battery cell assembly 20 more balanced, but also effectively extend the working time of the battery cell assembly 20 and reduce the attenuation rate of the battery cell assembly 20, thereby effectively extending the service life of the battery pack 100.

[0044] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A battery pack, characterized in that: include: A battery cell assembly, the battery cell assembly comprising a battery cell array in which a plurality of battery cells are arranged in sequence and a gap arranged in the battery cell array; the gap is surrounded by N battery cells, N>2, and the gap is sufficient to accommodate one battery cell; as well as A heat dissipation component, the heat dissipation component comprising a heat absorbing member disposed in the gap, the heat absorbing member comprising N side walls, the N side walls respectively abutting against side walls of the N battery cells; The heat dissipation assembly includes a heat conducting member in contact with the heat absorbing member to guide out the heat absorbed by the heat absorbing member; The heat conducting member is arranged along the axial direction of the battery core, and is partially located inside the heat absorbing member and partially located outside the heat absorbing member; The heat dissipation component is arranged at the highest heat generating point in the battery cell array; The heat conducting member comprises a shaft body arranged along the axial direction of the battery core and a plurality of heat dissipation fins arranged on the shaft body, wherein the heat dissipation fins are arranged on the arc-shaped side wall of the shaft body; or, The heat conducting member comprises a cylinder provided with a receiving groove and a plurality of heat dissipating fins, wherein the receiving groove is arranged along the axial direction of the cylinder, one end of the heat dissipating fin is mounted on the groove wall of the receiving groove, and the other end protrudes into the receiving groove; The heat absorbing component is provided with a receiving cavity for receiving the cylinder.

2. The battery pack as claimed in claim 1, characterized in that: The battery pack further comprises a shell for accommodating the battery core assembly and the heat dissipation assembly, and the heat conductive member is in contact with the shell.

3. The battery pack according to claim 1, wherein: The battery pack also includes a shell for accommodating the battery core assembly and the heat dissipation assembly, and the shell is provided with ventilation holes that cooperate with the heat dissipation assembly.

4. The battery pack according to claim 1, wherein: The heat absorber is a shape-shifting phase.

5. The battery pack according to claim 1, wherein: The heat absorbing component includes a phase changer and a heat conductive shell accommodating the phase changer.

6. A battery pack, comprising a plurality of battery cells, a battery cell frame and a heat dissipation assembly, wherein the battery cell frame is provided with a receiving slot to receive the battery cells; characterized in that: The receiving groove includes a first receiving groove for receiving N battery cells; the heat dissipation assembly includes a heat absorbing member disposed in the first receiving groove, the heat absorbing member includes N side walls, the N side walls respectively support the N battery cells received in the first receiving groove, and the N battery cells are located between the heat absorbing member and the side walls of the first receiving groove, N>2, and the gap is sufficient to accommodate one battery cell; The heat dissipation assembly includes a heat conducting member in contact with the heat absorbing member to guide out the heat absorbed by the heat absorbing member; The heat conducting member is arranged along the axial direction of the battery core, and is partially located inside the heat absorbing member and partially located outside the heat absorbing member; The heat dissipation component is arranged at the highest heat generating point in the battery cell array; The heat conducting member comprises a shaft body arranged along the axial direction of the battery core and a plurality of heat dissipation fins arranged on the shaft body, wherein the heat dissipation fins are arranged on the arc-shaped side wall of the shaft body; or, The heat conducting member comprises a cylinder provided with a receiving groove and a plurality of heat dissipating fins, wherein the receiving groove is arranged along the axial direction of the cylinder, one end of the heat dissipating fin is mounted on the groove wall of the receiving groove, and the other end protrudes into the receiving groove; The heat absorbing component is provided with a receiving cavity for receiving the cylinder.

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