Battery pack and electric equipment

Abstract

The embodiment of the invention relates to the technical field of batteries, and particularly discloses a battery pack and electric equipment.The battery pack comprises an upper shell, a lower shell, a battery cell assembly, a circuit board and a first component, the lower shell is provided with a battery cavity, the battery cell assembly is arranged in the battery cavity, the circuit board is connected with the battery cell assembly, and the first component is arranged in the battery cavity. The circuit board is located between the upper shell and the lower shell, the first component is provided with a first through hole penetrating through the first component, the first through hole is located between the circuit board and the battery cell assembly, and the first through hole is communicated with outside air. By means of the mode, the battery cell can be cooled through the first through hole of the first component, meanwhile, a user can arrange an external air blowing piece or an air draft piece at the first through hole of the first component, heat dissipation of the first component is accelerated, and convenience is achieved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of battery technology, and in particular, to a battery pack and an electrical device. Background Art

[0002] Agricultural drones or power tools are equipped with battery packs to power them. Since agricultural drones or power tools are usually charged and discharged at high rates and are used continuously for multiple times in a short period of time, the temperature of the battery cells inside the battery pack is relatively high. Charging the battery pack at this time poses a major safety hazard and is extremely unsafe. The battery pack can only be charged after the temperature of the battery cells drops to a charging temperature. Summary of the invention

[0003] In the process of realizing the present application, the inventor of the present application found that: since agricultural drones or electric tools are charged and discharged at high rates, the temperature of the battery cells in the battery pack is relatively high after multiple uses, so that users need to wait for a long time for the battery cells to cool to a charging temperature before charging the battery pack. The heat dissipation of the battery pack is poor, which is very inconvenient and the user experience is poor.

[0004] In view of the above problems, the embodiments of the present application provide a battery pack and electrical equipment, which improve the above-mentioned problems that due to the high-rate charging and discharging of agricultural drones or electric tools, after multiple uses, the battery cell temperature of the battery pack is high, and the user needs to wait for a long time for the battery cell to cool to the charging temperature before charging the battery pack, the battery pack has poor heat dissipation, and the user experience is poor.

[0005] According to one aspect of an embodiment of the present application, a battery pack is provided, comprising: an upper shell; a lower shell provided with a battery cavity; a battery cell assembly provided in the battery cavity; a circuit board, the circuit board being connected to the battery cell assembly; a first component located between the circuit board and the battery cell assembly, the first component comprising a first side plate, a second side plate, a third side plate, a fourth side plate and a bottom plate, the first side plate, the second side plate, the third side plate and the fourth side plate being connected end to end in sequence and surrounding the bottom plate, wherein the first side plate and the third side plate are arranged opposite to each other, and the second side plate and the fourth side plate are arranged opposite to each other; the first component is provided with a first through hole penetrating the first side plate, the bottom plate and the third side plate, the first through hole is connected to the outside of the battery pack, and the first through hole is located between the circuit board and the battery cell assembly. The first component can be used to cool the battery cell, which is convenient for multiple charging and use of the battery cell. The first through hole of the first component is connected to the outside air, and the first through hole can discharge the heat inside the first component out of the first component. At the same time, the user can use the external exhaust member provided at the first through hole of the first component to accelerate the heat dissipation of the first component and improve the heat dissipation of the first component.

[0006] In an optional manner, the first component is provided with a second through hole penetrating the bottom plate; the battery pack includes a connecting wire, one end of which is connected to the pole ear in the battery cell assembly, and the other end of the connecting wire is connected to the circuit board after passing through the second through hole.

[0007] In an optional manner, the second through holes are arranged at two ends of the bottom plate, and the second through holes are respectively arranged adjacent to the second side plate and the fourth side plate.

[0008] In an optional manner, the circuit board is a BMS board, and the BMS board is used to control the charging and discharging of the battery cell assembly.

[0009] In an optional manner, the battery cell assembly includes a plurality of battery cells stacked in sequence along a first direction, the battery cell includes an electrode assembly, a battery cell shell for accommodating the electrode assembly, and a pole ear, one end of the pole ear is connected to the electrode assembly, and the other end of the pole ear extends from the battery cell shell, and the first through hole is located between the circuit board and the pole ear; along the first direction, the first component is provided with a first through hole that penetrates the first side plate, the bottom plate and the third side plate.

[0010] In an optional manner, the battery pack further includes a first gasket, which is disposed between the first component and the tab of the battery cell, and the first gasket abuts against the first component and the tab of the battery cell respectively.

[0011] In an optional manner, the battery pack further includes a filling piece, which is disposed on the battery cell assembly and connected to the first component.

[0012] In an optional manner, the filling piece is formed by curing the thermal conductive adhesive injected into the top seal of the battery cell, and the filling piece is bonded and fixed to the first gasket and the first component.

[0013] In an optional manner, a first fixing portion and a second fixing portion are extended from the second side panel, the first fixing portion and the second fixing portion are spaced apart, a first fixing hole is provided at one end of the first fixing portion, a second fixing hole is provided at one end of the second fixing portion, and the first fixing hole and the second fixing hole are used to be fixed to one end of the upper shell; a third fixing portion and a fourth fixing portion are extended from the fourth side panel, the third fixing portion and the fourth fixing portion are spaced apart, a third fixing hole is provided at one end of the third fixing portion, a fourth fixing hole is provided at one end of the fourth fixing portion, and the third fixing hole and the fourth fixing hole are used to be fixed to the other end of the upper shell.

[0014] According to another aspect of an embodiment of the present application, there is provided an electric device, comprising the battery pack as described above.

[0015] The beneficial effects of the embodiments of the present application are as follows: different from the prior art, the embodiments of the present application are provided with an upper shell, a lower shell, a battery cell assembly, a circuit board and a first component, the lower shell is provided with a battery cavity, the battery cell assembly is provided in the battery cavity, the circuit board is connected to the battery cell assembly, the first component is located between the circuit board and the battery cell assembly, the first component includes a first side plate, a second side plate, a third side plate, a fourth side plate and a bottom plate, the first side plate, the second side plate, the third side plate and the fourth side plate are connected end to end in sequence and surround the bottom plate, wherein the first side plate and the third side plate are arranged opposite to each other, the second side plate and the fourth side plate are arranged opposite to each other, and the first component is provided with a through A first through hole passes through the first side plate, the bottom plate and the third side plate, the first through hole is connected to the outside of the battery pack, and the first through hole is located between the circuit board and the battery cell assembly. With this arrangement, during the use of the battery pack, when the temperature of the battery cell and the circuit board are high after the battery pack has been used multiple times, the first component can be used to cool the battery cell and the circuit board to shorten the time it takes for the battery cell to cool to a charging temperature. The first through hole of the first component is in circulation with the outside air, and the first through hole can discharge the heat inside the first component out of the first component. At the same time, the user can also set an external exhaust member at the first through hole of the first component to accelerate the heat dissipation of the first component and improve the heat dissipation effect of the first component, which is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0017] Figure 1 It is a schematic diagram of the overall structural assembly of the battery pack according to an embodiment of the present application;

[0018] Figure 2 It is a schematic diagram of the overall structure explosion of the battery pack of the embodiment of the present application;

[0019] Figure 3 is a side sectional view of the overall structure of the battery pack of an embodiment of the present application;

[0020] Figure 4 is a schematic diagram of the first component structure of the battery pack according to an embodiment of the present application;

[0021] Figure 5 is another structural schematic diagram of the first component of the battery pack according to an embodiment of the present application;

[0022] Figure 6 is a schematic diagram of the first component structure of another embodiment of the battery pack of the present application;

[0023] Figure 7 It is another exploded schematic diagram of the overall structure of the battery pack according to the embodiment of the present application;

[0024] Figure 8 It is a schematic diagram of a single cell structure of a battery pack according to an embodiment of the present application;

[0025] Fig. 9 is a schematic structural diagram of a filling member of a battery pack according to an embodiment of the present application;

[0026] Fig.10 is another cross-sectional view of the overall structure of the battery pack of the embodiment of the present application;

[0027] Fig.11 yes Fig.10 A schematic diagram of the structure enlargement in the middle;

[0028] Fig.12 This is the temperature rise curve of the battery cell of the traditional structure battery pack;

[0029] Fig.13 It is a temperature rise curve diagram of the battery cell body of the battery pack of the embodiment of the present application;

[0030] Fig.14 This is the temperature rise curve of the battery cell tab of the traditional structure battery pack;

[0031] Fig.15 It is a temperature rise curve of the battery cell tab of the battery pack of the embodiment of the present application;

[0032] Fig.16 It is a comparison chart of the temperature rise curves of the MOS tube, a BMS heating component, of a traditional structure battery pack and a battery pack according to an embodiment of the present application.

[0033] Description of the drawings: 10, lower shell; 10a, battery cavity; 20, battery cell assembly; 201, battery cell; 2011, electrode assembly; 2012, battery cell housing; 2012a, connecting portion; 2013, pole ear; 30, first component; 301, first through hole; 301a, channel; 302, first side plate; 3021, tooth piece; 303, second side plate; 3031, first fixing portion; 3031a, first fixing hole; 3032, second fixing portion; 3 032a, second fixing hole; 304, third side plate; 305, fourth side plate; 3051, third fixing portion; 3051a, third fixing hole; 3052, fourth fixing portion; 3052a, fourth fixing hole; 306, bottom plate; 3061, second through hole; 308, groove; 40, first gasket; 50, filling piece; 501, cavity; 501a, third through hole; 60, circuit board; 70, connecting line; 80, second gasket; 90, upper shell. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0036] See also Figure 1-Figure 3 The battery pack 01 includes: a lower shell 10, a battery cell assembly 20, a first component 30 and an upper shell 90.

[0037] The battery pack 01 further includes a first gasket 40, a filler 50, a circuit board 60, a connecting wire 70, and a second gasket 80. The battery cell assembly 20 is disposed in the lower shell 10, and the battery cell assembly 20 partially passes through the filling member 50. The first gasket 40 is disposed on the filling member 50, and the first gasket 40 abuts against the portion of the battery cell assembly 20 passing through the filling member 50. The first member 30 is fixed to the filling member 50, and the first member 30 is located on the first gasket 40. The second gasket 80 is disposed on the first member 30, and the circuit board 60 is disposed on the second gasket 80. The connecting wire 70 is electrically connected to the battery cell assembly 20 and the circuit board 60, respectively, and the upper shell 90 is covered on the first member 30. The first gasket 40 and the second gasket 80 have thermal conductivity and are used to conduct the heat of the circuit board 60 and the battery cell assembly 20 to the first component 30. The first component 30 is exposed between the lower shell 10 and the upper shell 90. The first component 30 can directly exchange heat with the outside world, which is beneficial to improve the heat dissipation effect of the first component 30 on the circuit board and the battery cell assembly 20.

[0038] In order to better illustrate the structure of the battery pack 01 , the structure of the battery pack 01 will be described in conjunction with X, Y, and Z coordinate axes, wherein the X, Y, and Z coordinate axes are perpendicular to each other.

[0039] For the first member 30, Figure 2 and Figure 4 As shown, the first component 30 includes a first side plate 302, a second side plate 303, a third side plate 304, a fourth side plate 305 and a bottom plate 306. The first side plate 302, the second side plate 303, the third side plate 304 and the fourth side plate 305 are connected end to end in sequence and surround the bottom plate 306. The first side plate 302 and the third side plate 304 are arranged opposite to each other, and the second side plate 303 and the fourth side plate 305 are arranged opposite to each other. The first side plate 302, the second side plate 303, the third side plate 304, the fourth side plate 305 and the bottom plate 306 are also enclosed together to form a groove 308. The groove 308 is used to accommodate the circuit board 60 and the second gasket 80. The first member 30 is also provided with a second through hole 3061 penetrating the bottom plate 306, the second through hole 3061 is provided at both ends of the bottom plate 306, and the second through hole 3061 is respectively provided adjacent to the second side plate 303 and the fourth side plate 305, the second through hole 3061 is communicated with the groove 308, and the second through hole 3061 is used for the connection line 70 to pass through. The manufacturing material of the first member 30 is metal, for example: aluminum alloy, copper alloy, etc.

[0040] like Figure 5 As shown, the second side plate 303 extends with a first fixing portion 3031 and a second fixing portion 3032, the first fixing portion 3031 and the second fixing portion 3032 are arranged at intervals, one end of the first fixing portion 3031 is provided with a first fixing hole 3031a, one end of the second fixing portion 3032 is provided with a second fixing hole 3032a, and the first fixing hole 3031a and the second fixing hole 3032a are used to be fixed to one end of the upper shell 90. The fourth side plate 305 extends with a third fixing portion 3051 and a fourth fixing portion 3052, the third fixing portion 3051 and the fourth fixing portion 3052 are arranged at intervals, one end of the third fixing portion 3051 is provided with a third fixing hole 3051a, one end of the fourth fixing portion 3052 is provided with a fourth fixing hole 3052a, and the third fixing hole 3051a and the fourth fixing hole 3052a are used to be fixed to the other end of the upper shell 90.

[0041] The first component 30 is also provided with a first through hole 301 that penetrates the first side plate 302, the bottom plate 306 and the third side plate 304. The first side plate 302 has a plurality of tooth plates 3021 extending toward the first through hole 301. The plurality of tooth plates 3021 are arranged in the first through hole at intervals along the second direction. The plurality of tooth plates 3021 separate the first through hole 301 into a plurality of channels 301a, and the second direction is perpendicular to the first direction. The first through hole 301 penetrates the first component 30 along the first direction or the second direction. The first through hole 301 is exposed between the lower shell 10 and the upper shell 90. In other words, the plurality of channels 301a are exposed between the lower shell 10 and the upper shell 90. The plurality of channels 301a are used for external airflow to flow through. The airflow flowing through the plurality of channels 301a will take away the heat of the first component 30, thereby improving the efficiency of heat exchange between the first component 30 and the outside world, thereby improving the heat dissipation effect. The tooth pieces 3021 can increase the heat dissipation area of ​​the first component 30 , and increase the contact area between the first component 30 and the air, thereby improving the heat dissipation efficiency of the first component 30 .

[0042] In order to further improve the heat dissipation effect, in some embodiments, the battery pack 01 may also include a fan (not shown), which is installed on the first component 30, and the air outlet of the fan is aligned with the port at one end of the plurality of channels 301a. The fan blows air into the plurality of channels 301a to speed up the flow speed of the airflow in the plurality of channels 301a, thereby improving the heat dissipation efficiency.

[0043] It is understandable that: in other embodiments, the tooth piece 3021 may not be provided, and only the first through hole 301 is provided, and the first through hole 301 is used for external airflow to flow through, such as Figure 6 As shown. In addition, the number of the first through holes 301 is not limited, for example: one first through hole 301 penetrates the first side plate 302, the bottom plate 306 and the third side plate 304, and another first through hole 301 can penetrate the second side plate 303, the bottom plate 306 and the fourth side plate 305, and the two first through holes 301 are interconnected, which can accelerate the flow of airflow inside the first component 30 and improve the heat dissipation effect of the first component 30. At the same time, the first through hole 301 is not limited to being set to penetrate only the first side plate 302, the bottom plate 306 and the third side plate 304, that is, the first through hole 301 penetrates the first component 30 along the first direction, and the first through hole 301 can also be set to penetrate only the second side plate 303, the bottom plate 306 and the fourth side plate 305, that is, the first through hole 301 penetrates the first component 30 along the second direction.

[0044] For the above-mentioned battery cell assembly 20, Figure 7 and Figure 8As shown, the battery cell assembly 20 includes a plurality of battery cells 201 stacked in sequence along a first direction, and the battery cells 201 are used to be electrically connected to the circuit board 60 .

[0045] The battery cell 201 includes an electrode assembly 2011, a battery cell housing 2012 for accommodating the electrode assembly 2011, and a tab 2013. One end of the tab 2013 is connected to the electrode assembly 2011, and the other end of the tab 2013 extends from the battery cell housing 2012. The battery cell housing 2012 is used to seal the electrode assembly 2011 and limit external water vapor from entering the battery cell housing 2012. The tab 2013 includes a positive tab and a negative tab, and the multiple battery cells 201 are connected through the positive tab and the negative tab.

[0046] For the above-mentioned filling member 50, if Figure 7 , Fig. 9 and Fig.10 As shown, the filling member 50 is provided with a cavity 501 and a plurality of third through holes 501a, and the plurality of third through holes 501a are connected to the cavity 501. The filling member 50 is provided on the battery cell assembly 20, and the positive and negative tabs of a battery cell 201 pass through the two third through holes 501a respectively and are inserted into the cavity 501, and the tabs of the plurality of battery cells 201 are connected in the cavity.

[0047] It is worth noting that: in some embodiments, the filler 50 is formed by curing the thermal conductive glue poured into the top seal of the battery cell 201, and the filler is bonded and fixed to the first gasket 40 and the first component 30. In addition, since the filler 50 has thermal conductivity, the filler 50 can be used to transfer the heat generated by the battery cell 201 to the first component 30, and then dissipate the heat to the outside through the first component 30, thereby achieving the purpose of reducing the temperature of the battery cell 201. Of course, the material of the filler 50 is not limited to the above-mentioned thermal conductive structural glue, and can also be other materials, as long as the filler 50 satisfies the requirements of thermal conductivity of the battery cell 201 and has an insulating effect, such as thermal conductive gel.

[0048] For the first gasket 40 and the second gasket 80, as Figure 7 , Fig.10 and Fig.11 As shown, the first gasket 40 is disposed between the first component 30 and the tab 2013 of the battery cell 201, and the first gasket 40 is respectively in contact with the first component 30 and the tab 2013 of the battery cell 201. The first gasket 40 has thermal conductivity, and the heat generated by the tab 2013 of the battery cell 201 is conducted to the first component 30 through the first gasket 40, and the first component 30 dissipates the heat to the outside, thereby reducing the temperature of the tab 2013 of the battery cell.

[0049] In some embodiments, the first gasket 40 is an insulating thermally conductive gasket, which not only plays an insulating role to prevent the first component 30 from contacting the battery cell 201 and causing a short circuit in the battery cell 201, but also increases the thermal conductivity between the battery cell tab 2013 and the first component, thereby improving the heat dissipation effect of the first component on the battery cell tab 2013.

[0050] The second gasket is disposed in the groove 308, and the second gasket 80 is disposed between the bottom plate 306 and the circuit board 60 along the third direction, and the second gasket 80 is respectively in contact with the circuit board 60 and the bottom plate 306. The second gasket 80 has a thermal conductivity, and is used to conduct the heat generated by the circuit board 60 to the first component 30, and the heat is dissipated to the outside by the first component 30, so as to reduce the temperature of the circuit board 60.

[0051] In some embodiments, the second gasket 80 is made of insulating thermally conductive adhesive, which can transfer the heat generated by the circuit board 60 to the first component 30. At the same time, it can also play an insulating role to prevent the circuit board 60 from directly contacting the first component 30 and causing a short circuit in the circuit board 60.

[0052] It should be noted that: the first direction refers to the direction along the X axis. Optionally, the first direction is the thickness direction of the battery cell 201. The second direction refers to the direction along the Y axis. The third direction refers to the direction along the Z axis.

[0053] For the above-mentioned circuit board 60 and connecting wire 70, as Figure 7 As shown, the circuit board 60 is received in the groove 308, so that the circuit board 60 is arranged on a surface of the first member 30 away from the lower shell 10. One end of the connecting wire 70 is connected to the pole ear 2013 of the battery cell 201, and the other end of the connecting wire 70 passes through the second through hole 3061 and is connected to the circuit board 60, so as to realize the electrical connection between the circuit board 60 and the battery cell 201. In some embodiments, the circuit board 60 is a Battery Management System (BMS) board, and the BMS board is used to control the charging and discharging of the battery cell assembly 20.

[0054] For the lower shell 10 and the upper shell 90, as Figure 7As shown, the lower shell 10 is provided with a battery cavity 10a, and the battery cavity 10a is used to accommodate the battery cell assembly 20. The upper shell 90 is connected to the first component 30, and the upper shell 90 covers the notch of the groove 308. Among them, the upper shell 90 covers the notch of the groove 308 to prevent the circuit board 60 disposed in the groove 308 from being exposed to the air, reduce the contact between the circuit board 60 and external components, so as to avoid short circuit of the circuit board 60, and the upper shell 90 plays an isolating and protective role for the circuit board 60. The lower shell 10 can protect the battery cell assembly 20 accommodated in the battery cavity 10a, and limit the damage to the battery cell assembly 20 caused by external components. It can be understood that the fixing method of the upper shell 90 and the first component 30 can be screw connection, welding, etc.

[0055] The assembly process of the battery pack 01 includes: placing the battery cell assembly 20 in the battery cavity 10a of the lower shell 10, and a preset space is separated between the battery cell assembly 20 and the opening of the battery cavity 10a, then abutting the first gasket 40 against the pole ear 2013 of the battery cell 201, then pouring thermal conductive glue, and the thermal conductive glue fills the preset space, the thermal conductive glue is bonded and fixed to the first gasket 40, the first component 30 is bonded and fixed to the thermal conductive glue, and then the second gasket 80 is set in the first component 30 and fixed to the first component 30, the circuit board 60 is set on the second gasket 80 and fixed to the second gasket 80, and finally the upper shell 90 is fixed to the first component 30, wherein the filling piece 50 is formed after the thermal conductive glue is cured.

[0056] In order to better illustrate the technical effect that can be achieved by the first component used in the technical solution of this application, this application also provides relevant comparative tests between a conventional structure battery pack (without the first component) and the battery pack of this application. The specific test process is as follows:

[0057] Thermal simulation analysis is used to simulate the temperature distribution of the battery pack of the present application and the traditional structure battery pack under the same working conditions.

[0058] Test materials: traditional structure battery pack and battery pack of the present application, both battery packs are provided with 14 battery cells.

[0059] Test conditions: The simulated working condition is 35℃, the battery pack charging rate is 5C, the discharge is the user's actual current condition, 8 cycles of continuous charging and discharging without static state, and the external environment wind speed is 2m / s.

[0060] The thermal simulation analysis results are shown in Table 1 below:

[0061] Table 1

[0062]

[0063] Depend on Fig.12From the temperature rise curve of the battery cell of the traditional structure battery pack, it can be seen that the maximum temperature of the battery cell of the traditional structure battery pack is stable at 95.8℃, which is relatively high, and the maximum temperature difference of the battery cell is 13.2℃. Fig.13 From the temperature rise curve of the battery cell body of the battery pack of the present application, it can be seen that the maximum temperature of the battery cell body of the battery pack of the present application is stable at 75.7°C, and the maximum temperature difference of the battery cell is 5.5°C. Compared with the temperature rise of the battery cell body of the battery pack with a traditional structure, the maximum temperature of the battery cell body of the battery pack of the present application is reduced by 20.1°C, and the maximum temperature difference of the battery cell is reduced by 7.7°C. This shows that the battery pack using the heat dissipation structure of the present application can greatly reduce the temperature rise of the battery cell and improve the maximum temperature difference of the battery cell.

[0064] Depend on Fig.14 From the temperature rise curve of the cell ear of the traditional structure battery pack, it can be seen that the maximum temperature of the cell ear of the traditional structure battery pack is stable at 101℃, and the maximum temperature difference of the cell ear is 9.4℃. Fig.15 From the temperature rise curve of the battery cell tab of the battery pack of the present application, it can be seen that the maximum temperature of the battery cell tab of the battery pack of the present application is stable at 75.7°C, and the maximum temperature difference of the battery cell tab is 2.3°C. Compared with the temperature rise of the battery cell tab of the battery pack with the traditional structure, the maximum temperature of the battery cell tab of the battery pack of the present application is reduced by 34.6°C, and the maximum temperature difference of the battery cell tab is reduced by 7.1°C. This shows that the battery pack adopting the heat dissipation structure of the present application can greatly reduce the temperature rise of the battery cell tab and improve the maximum temperature difference of the battery cell tab.

[0065] Depend on Fig.16 From the temperature rise curve of the MOS tube of the BMS heating component on the traditional structure battery pack, it can be seen that the maximum temperature of the MOS tube of the BMS heating component of the traditional structure battery pack is 70℃. Fig.16 From the temperature rise curve of the MOS tube of the BMS heating component on the battery pack of the present application, it can be seen that the maximum temperature of the MOS tube of the BMS heating component of the battery pack of the present application is 53.7°C. Compared with the temperature rise of the MOS tube of the BMS heating component of the battery pack of the traditional structure, the maximum temperature of the MOS tube of the BMS heating component of the battery pack of the present application is reduced by 16.3°C. This shows that the battery pack adopting the heat dissipation structure of the present application can greatly reduce the temperature of the BMS heating component.

[0066] In summary, the battery pack adopting the heat dissipation structure of the present application has a better heat dissipation effect than the battery pack with a traditional structure. It can not only cool the battery cell body, battery cell tabs and BMS heating components, but also solve the problem of excessive temperature rise of the battery cell when the battery pack is continuously charged and discharged for multiple cycles without standing still, so that the battery pack can achieve continuous charging and discharging for multiple cycles without standing still, which is more convenient.

[0067] In the embodiment of the present application, an upper shell 90, a lower shell 10, a battery cell assembly 20, a circuit board 60 and a first component 30 are provided, the lower shell 10 is provided with a battery cavity 10a, the battery cell assembly 20 is arranged in the battery cavity 10a, the circuit board 60 is connected to the battery cell assembly 20, the circuit board 60 is located between the upper shell 90 and the lower shell 10, the first component 30 is provided with a first through hole 301 that penetrates the first component 30, the first through hole 301 is located between the circuit board and the battery cell assembly 20, and the first through hole 301 is connected to the outside air. In this way, in the battery During the use of the pack, when the temperature of the battery cell 201 and the circuit board 60 are high after the battery pack has been used multiple times, the first component 30 can be used to cool the battery cell 201 and the circuit board 60 to shorten the time it takes for the battery cell 201 to cool to a charging temperature. The first through hole 301 of the first component 30 is ventilated with the outside air, and the first through hole 301 can discharge the heat inside the first component 30 out of the first component 30. At the same time, the user can also set an external exhaust member at the first through hole 301 of the first component 30 to accelerate the heat dissipation of the first component 30 and improve the heat dissipation effect of the first component 30, which is more convenient.

[0068] The present application also provides an embodiment of an electrical device, which includes the above-mentioned battery pack. The electrical device includes but is not limited to agricultural drones, two-wheeled electric vehicles, energy storage equipment, handheld power tools, etc. The function and structure of the battery pack can be referred to the above-mentioned embodiments, which will not be described one by one here.

[0069] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A battery pack, characterized in that: include: Upper shell; The lower shell is provided with a battery cavity; A battery cell assembly is disposed in the battery cavity; A circuit board, wherein the circuit board is connected to the battery core assembly; A first component is located between the circuit board and the battery cell assembly, the first component includes a first side plate, a second side plate, a third side plate, a fourth side plate and a bottom plate, the first side plate, the second side plate, the third side plate and the fourth side plate are sequentially connected end to end and surround the bottom plate, wherein the first side plate is arranged opposite to the third side plate, and the second side plate is arranged opposite to the fourth side plate; The first component is provided with a first through hole penetrating the first side plate, the bottom plate and the third side plate, the first through hole is connected to the outside of the battery pack, and the first through hole is located between the circuit board and the battery cell assembly.

2. The battery pack according to claim 1, characterized in that: The first member is provided with a second through hole penetrating through the bottom plate; The battery pack includes a connecting wire, one end of which is connected to a pole ear in the battery cell assembly, and the other end of which is connected to the circuit board after passing through the second through hole.

3. The battery pack according to claim 2, characterized in that: The second through holes are arranged at two ends of the bottom plate, and the second through holes are arranged adjacent to the second side plate and the fourth side plate respectively.

4. The battery pack according to claim 1, characterized in that: The circuit board is a BMS board, and the BMS board is used to control the charging and discharging of the battery cell assembly.

5. The battery pack according to any one of claims 1 to 4, characterized in that: The battery cell assembly includes a plurality of battery cells stacked in sequence along a first direction, the battery cell includes an electrode assembly, a battery cell shell for accommodating the electrode assembly, and a tab, one end of the tab is connected to the electrode assembly, the other end of the tab extends from the battery cell shell, and the first through hole is located between the circuit board and the tab; Along the first direction, the first member is provided with a first through hole penetrating the first side plate, the bottom plate and the third side plate.

6. The battery pack according to claim 5, characterized in that: The battery pack further includes a first gasket, which is disposed between the first component and the tab of the battery cell, and the first gasket abuts against the first component and the tab of the battery cell respectively.

7. The battery pack according to claim 6, characterized in that: The battery pack further includes a filling piece, which is disposed on the battery cell assembly and connected to the first component.

8. The battery pack according to claim 7, characterized in that: The filling piece is formed by curing the heat conductive adhesive poured into the top seal of the battery cell, and the filling piece is bonded and fixed to the first gasket and the first component.

9. The battery pack according to claim 5, characterized in that: The second side plate extends to have a first fixing portion and a second fixing portion, the first fixing portion and the second fixing portion are arranged at intervals, one end of the first fixing portion is provided with a first fixing hole, one end of the second fixing portion is provided with a second fixing hole, and the first fixing hole and the second fixing hole are used to be fixed to one end of the upper shell; The fourth side plate is extended with a third fixing portion and a fourth fixing portion, the third fixing portion and the fourth fixing portion are arranged at intervals, a third fixing hole is arranged at one end of the third fixing portion, and a fourth fixing hole is arranged at one end of the fourth fixing portion, and the third fixing hole and the fourth fixing hole are used to be fixed to the other end of the upper shell.

10. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 1 to 9.

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