Battery pack and electric device

Abstract

The utility model relates to the technical field of batteries, and provides a battery pack and an electric device. The battery pack comprises a shell, and a first cold plate, a heat conduction part and a battery cell which are arranged in the shell, a containing cavity is defined between the first cold plate and the shell and used for being filled with cooling liquid. A through hole is formed in the first cold plate, a lug boss is arranged on the battery cell, and the lug boss penetrates through the through hole and is embedded into the accommodating cavity; the heat conduction part is arranged in the containing cavity and connected with the protruding part. According to the battery pack disclosed by the utility model, the battery cells can be cooled through the cooling liquid in the accommodating cavity, so that compared with a mode of only arranging a cold plate for cooling the battery cells, the heat dissipation ways of the battery cells are increased, the heat dissipation speed of the battery cells is improved, and the heat dissipation capability of the battery pack is favorably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, especially relate to a battery pack. BACKGROUND

[0002] The battery pack inevitably appears the heat phenomenon in the use process, this problem if not being solved properly, will have the serious negative influence to the use performance and the life of battery pack. The main heat generating element of lithium battery pack is the electric core. The electric core is in the charging and discharging process, the internal chemical reaction is very active, lithium ion is in the positive and negative pole constantly inserts and takes out, and the electron flows through the external circuit and forms the electric current. These chemical reactions and electron flow all can produce the heat, make the temperature of electric core gradually rise, and the excessively high temperature can lead to the chemical reaction rate of electric core inside to accelerate, and the side reaction increases, thereby speeds up the aging of electric core, reduces the capacity and the charging and discharging efficiency of electric core, shortens the service life of battery pack.

[0003] In the existing battery pack, the electric core usually adopts the heat exchange form with the cold plate and carries out heat dissipation. However, limited by the structure of the cold plate and the arrangement of the elements in the battery pack, the effective area of the electric core and the cold plate for heat exchange is limited, which is not conducive to improving the heat dissipation capacity of the battery pack. SUMMARY

[0004] Therefore, the utility model aims at providing a battery pack to improve the heat dissipation capacity of the battery pack.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] A battery pack, comprising a shell, a first cold plate, a heat-conducting part and an electric core arranged in the shell;

[0007] The first cold plate and the shell form a containing cavity therebetween, and the containing cavity is used to fill cooling liquid;

[0008] The first cold plate is provided with a through hole, and the electric core is provided with a protruding part, and the protruding part is embedded in the containing cavity through the through hole;

[0009] The heat-conducting part is arranged in the containing cavity, and the heat-conducting part is connected with the protruding part.

[0010] Further, the protruding part comprises a pole of the electric core, the heat-conducting part comprises a busbar connected with the pole, and the cooling liquid is an insulating cooling liquid.

[0011] Further, the electric core is a same-side pole electric core, and the poles on the same side are embedded in the containing cavity.

[0012] Further, the battery pack further comprises a second cold plate for heat exchange with the battery cell, and the first cold plate and the second cold plate are arranged on two sides of the battery cell.

[0013] Further, one side of the battery cell facing the second cold plate is provided with an explosion-proof valve, and the second cold plate is provided with a discharge hole corresponding to the explosion-proof valve.

[0014] Further, a plurality of battery cells are divided into at least one group, each group of battery cells comprises two rows of battery cells, a pressure relief channel is formed between the two rows of battery cells of each group, and the two rows of battery cells of each group each comprise a plurality of battery cells arranged along the length direction of the pressure relief channel, and the explosion-proof valve of each battery cell is arranged towards the pressure relief channel.

[0015] Further, a sealing glue is arranged between the battery cell and the first cold plate, and the sealing glue is used to seal the gap between the protruding part and the via hole.

[0016] Further, the accommodating cavity is provided with a detection part for detecting whether gas enters the accommodating cavity.

[0017] Further, the shell comprises a guard plate arranged at a distance from the first cold plate, the first cold plate and the guard plate are connected through a sealing part, and the first cold plate, the guard plate and the sealing part form the accommodating cavity.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] The battery pack can cool the battery cell through the first cold plate, fill the accommodating cavity formed by the first cold plate and the shell with the cooling liquid, heat exchange the protruding part of the battery cell embedded in the accommodating cavity, and heat the cooling liquid through the heat-conducting part, and finally the cooling liquid is cooled by the shell and the first cold plate in contact with it, compared with the form of only setting the cold plate to cool the battery cell, the cooling way of the battery cell is increased, the cooling speed of the battery cell is improved, and the cooling capacity of the battery pack is improved.

[0020] Secondly, the battery cell pole and the bus bar in the battery pack generate more heat, so that the pole is embedded in the accommodating cavity and the bus bar is arranged in the accommodating cavity, so that the pole and the bus bar are in full contact with the cooling liquid for heat dissipation, which is beneficial to improve the cooling capacity of the battery pack, and the first cold plate is arranged on the side close to the pole of the battery cell, which can better absorb the heat of the pole side of the battery cell which generates more heat. The battery cell is arranged with the same side pole, so that the two poles are embedded in the accommodating cavity for heat dissipation, which is beneficial to improve the heat dissipation effect.

[0021] Furthermore, the second cold plate assists in heat dissipation for the battery cell. The first and second cold plates together sandwich the cell, resulting in better heat exchange and a more compact arrangement. The second cold plate also features a corresponding vent for the explosion-proof valve. This ensures that in the event of thermal runaway, the high-temperature fumes and molten materials ejected from the ruptured valve are not blocked by the second cold plate, facilitating rapid pressure relief of the battery pack and improving safety.

[0022] Furthermore, grouping the battery cells and placing pressure relief channels between each group provides a directional discharge path for the high-temperature delay and molten material ejected during thermal runaway of the cells, reducing the accumulation of internal pressure in the battery pack. All explosion-proof valves face these channels, ensuring concentrated discharge of high-temperature fumes and preventing battery pack deformation or rupture caused by localized pressure overload. Sealant filling the gaps between the protrusions and through-holes prevents coolant leakage and also blocks external dust or moisture from entering the containment cavity, maintaining stable coolant operation.

[0023] In addition, a detection unit is installed in the housing cavity. If coolant leaks into the cavity, the detection unit can detect the ingress of gas. Combined with other devices, this can limit the use of the battery pack, alert the user, and assist in detecting whether the battery pack has been damaged by impacts, preventing potential accidents. The protective plate and the first cold plate are connected by a sealing part to form a complete cavity. The overall structure has good strength, ensuring the sealing of the housing cavity while simplifying the assembly of the battery pack.

[0024] Another objective of this invention is to provide an electrical device, wherein the electrical device is provided with the aforementioned battery pack.

[0025] The electrical device described in this utility model, by setting up a first cold plate, a second cold plate and a related heat dissipation structure for the receiving cavity, can reduce the temperature of the battery cell relatively quickly, reduce the impact of high temperature on the performance of the battery pack, and the good heat dissipation and temperature control help to extend the service life of the battery pack and maintain a high charging and discharging efficiency. Attached Figure Description

[0026] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0027] Figure 1 This is a partial cross-sectional view of the battery pack described in an embodiment of the present utility model;

[0028] Figure 2 This is an exploded view of the battery pack described in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the first cold plate according to an embodiment of the present utility model;

[0030] Figure 4 This is a schematic diagram of the battery cell structure described in an embodiment of the present invention;

[0031] Figure 5 This is another embodiment of the battery cell described in this utility model.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Shell;

[0034] 101. Protective plate; 102. Sealing part; 103. Box body;

[0035] 2. First cold plate;

[0036] 201. Via;

[0037] 3. Battery cells;

[0038] 301. Pole post; 302. Explosion-proof valve;

[0039] 4. Busbar;

[0040] 5. Second cold plate;

[0041] 501. Drainage port;

[0042] 6. Thermally conductive adhesive;

[0043] 7. Sensors;

[0044] a. Receiving cavity;

[0045] b. Pressure relief channel. Detailed Implementation

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0047] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0048] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0050] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0051] Example 1

[0052] This embodiment relates to a battery pack that improves the heat dissipation capacity of the battery pack.

[0053] In terms of overall structure, combined Figure 1 and Figure 2 As shown, a battery pack in this embodiment includes a housing 1, and a first cold plate 2, a heat-conducting part, and a battery cell 3 disposed within the housing 1. A receiving cavity a is formed between the first cold plate 2 and the housing 1, and the receiving cavity a is used to fill coolant. The first cold plate 2 has a through hole 201, and the battery cell 3 has a protrusion that passes through the through hole 201 and is embedded in the receiving cavity a. The heat-conducting part is disposed in the receiving cavity a and is connected to the protrusion.

[0054] As configured above, the battery pack of this embodiment not only has its first cold plate 2 capable of cooling the battery cell 3, but also, by providing a receiving cavity a formed by the first cold plate 2 and the housing 1, and filling the receiving cavity a with coolant, the coolant can exchange heat with the protrusion of the battery cell 3 embedded in the receiving cavity a. Simultaneously, the heat-conducting part can quickly absorb heat from the protrusion of the battery cell 3 and release heat to the coolant, which is then cooled by the housing 1 and the first cold plate 2 in contact with it. Compared to conventional technologies that only use a cold plate for cooling the battery cell 3, this increases the heat dissipation pathways for the battery cell 3, improves the heat dissipation speed of the battery cell 3, and is beneficial for improving the heat dissipation capacity of the battery pack.

[0055] Based on the above overview, refer toFigures 1 to 3 As shown, specifically, the parts of the battery cell 3 that generate more heat can be located in the protrusion to improve the heat dissipation capacity of the battery cell 3. The first cold plate 2 is in the form of a liquid cooling plate, and it has a liquid cooling channel inside for the flow of refrigerant. The opening path of the liquid cooling channel is arranged to avoid the opening position of the through hole 201.

[0056] Preferably, the protrusion includes the terminal post 301 of the battery cell 3, the heat-conducting part includes the busbar 4 connecting the terminal post 301, and the coolant is an insulating coolant. The terminal post 301 and busbar 4 of the battery cell 3 in the battery pack generate significant heat. Embedding the terminal post 301 into the receiving cavity a and arranging the busbar 4 within the receiving cavity a allows for sufficient contact and heat dissipation between the terminal post 301 and the busbar 4 and the coolant, thus improving the heat dissipation capacity of the battery pack. Furthermore, the first cold plate 2 is positioned near the side of the battery cell 3 where the terminal post 301 is located, which also better absorbs the heat from the side of the battery cell 3 where the terminal post 301 generates significant heat. The first cold plate 2 also separates the busbar 4 from the main body of the battery cell 3, preventing the high-temperature fumes and molten material emitted by the battery cell 3 from contacting the busbar 4 and causing high-voltage arcing in the event of thermal runaway.

[0057] In this embodiment, the connection between busbar 4 and terminal post 301 is laser welding. Conventional battery pack heat dissipation methods are insufficient for cooling busbar 4, which accumulates heat due to continuous power transmission, especially during high-power charging and discharging of the battery pack. In this embodiment, busbar 4 is immersed in insulating coolant, ensuring sufficient contact between the coolant and busbar 4, resulting in a large heat transfer area and facilitating rapid heat dissipation from busbar 4.

[0058] Secondly, regarding the specific type of coolant, insulating fluorocarbon or hydrocarbon compounds, such as mineral oil, can be used, as they possess good insulation and thermal conductivity. In this embodiment, mineral oil is used as the coolant. Simultaneously, to facilitate the injection of coolant into the receiving cavity a, the first cold plate 2 in this embodiment is provided with an injection connector for connecting a liquid supply device to inject coolant into the receiving cavity a.

[0059] Specifically, regarding the specific form of cell 3, such as Figure 1 and Figure 4 As shown, cell 3 is a same-side terminal cell, with both terminals 301 embedded in the receiving cavity a. Setting cell 3 as a same-side terminal cell allows both terminals 301 to be embedded in the receiving cavity a for heat dissipation, thus improving heat dissipation efficiency. In this embodiment, cell 3 is inverted, meaning the terminals 301 are facing downwards, and the receiving cavity a is located at the bottom of the battery pack.

[0060] It should be noted that the same-side terminal 301 of the battery cell 3, that is, the positive and negative terminals 301 of the battery cell 3 extend from the same side of the battery cell 3 housing 1, and the two terminals 301 face the same direction. In this embodiment, the battery cell 3 adopts the form of a square-shell battery cell 3, which has the advantage of low internal resistance and is suitable for high-rate fast charging scenarios. Correspondingly, the battery cell 3 also has the form of terminals 301 on both sides, that is, the positive and negative terminals 301 of the battery cell 3 extend from both sides of the battery cell 3 housing 1, such as some blade batteries 3, cylindrical batteries 3, etc.

[0061] Preferably, in order to further improve the heat dissipation capability of the battery pack, refer to Figure 1 and Figure 2 As shown, the battery pack also includes a second cold plate 5 for heat exchange with the battery cell 3. The first cold plate 2 and the second cold plate 5 are respectively placed on both sides of the battery cell 3. The second cold plate 5 can assist in heat dissipation of the battery cell 3. The first cold plate 2 and the second cold plate 5 together sandwich the battery cell 3 between them, resulting in better heat exchange effect and a more compact arrangement. In this embodiment, the second cold plate 5 is also in the form of a liquid cooling plate.

[0062] Secondly, because battery cell 3 may experience thermal runaway during use, an explosion-proof valve 302 is installed on battery cell 3 to discharge high-temperature fumes and molten materials inside battery cell 3. To ensure that the high-temperature fumes and molten materials ejected in the event of thermal runaway of battery cell 3 are not obstructed, combined with... Figure 2 and Figure 4 As shown, in this embodiment, the battery cell 3 is provided with an explosion-proof valve 302 on the side facing the second cold plate 5, and the second cold plate 5 is provided with a discharge hole 501 corresponding to the explosion-proof valve 302. The discharge hole 501 on the second cold plate 5 corresponding to the explosion-proof valve 302 ensures that when the battery cell 3 experiences thermal runaway, the high-temperature fumes and molten materials ejected by the rupture of the explosion-proof valve 302 are not blocked by the second cold plate 5, which facilitates rapid pressure relief of the battery pack and improves safety.

[0063] Preferably, in order to improve the sealing performance at the connection between the via 201 and the battery cell 3, such as Figure 1 and Figure 2 As shown, in this embodiment, a sealant 6 is provided between the battery cell 3 and the first cold plate 2. The sealant 6 is used to seal the gap between the protrusion and the through hole 201. The sealant 6 fills the gap between the protrusion and the through hole 201, which can prevent coolant leakage and at the same time block external dust or moisture from entering the receiving cavity a, so as to maintain the stable use of coolant. Specifically, the sealant 6 is a thermally conductive structural adhesive, which is tightly attached to the outer shell on the side of the battery cell 3 where the electrode post 301 is located, which can improve the heat transfer efficiency of the battery cell 3 to the first cold plate 2 and accelerate the heat dissipation of the battery cell 3. Of course, the sealant 6 can also be provided along the outer periphery of the through hole 201 and separately bonded between the first cold plate 2 and the battery cell 3 using thermally conductive structural adhesive to improve heat transfer efficiency, which is different from the function of the sealant 6.

[0064] Meanwhile, in this embodiment, thermally conductive structural adhesive is also provided between the second cold plate 5 and the battery cell 3. The thermally conductive structural adhesive serves to fix the relative position of the second cold plate 5 and the battery cell 3, and to conduct the heat of the battery cell 3 to the second cold plate 5.

[0065] Preferably, for the specific structure of the battery pack housing 1, see [reference needed]. Figure 2 In this embodiment, the housing 1 includes a protective plate 101 spaced apart from the first cold plate 2. The first cold plate 2 and the protective plate 101 are connected by a sealing part 102, and the first cold plate 2, the protective plate 101, and the sealing part 102 enclose a receiving cavity a. The protective plate 101 and the first cold plate 2 are connected by the sealing part 102 to form a complete cavity, which has good overall structural strength. While ensuring the sealing performance of the receiving cavity a, it can also simplify the assembly of the battery pack. In this embodiment, the sealing part 102 is a sealing strip, which is arranged along the inner contour of the protective plate 101 and encloses the area between the protective plate 101 and the first cold plate 2 to form the receiving cavity a. The sealing strip is provided with through holes for the main positive busbar 4 and the main negative busbar 4 of the battery cells 3 to pass through the receiving cavity a. The hole wall of the through hole contacts and seals the main positive busbar 4 or the main negative busbar 4 to maintain the sealing inside the receiving cavity a.

[0066] In addition, the battery pack also includes a housing 103, which is a frame and connected to a protective plate 101. The protective plate 101 is fixed to the bottom of the housing 103. The first cold plate 2, the battery cell 3, and the second cold plate 5 are arranged in the housing 103 in a bottom-to-top order. The upper part of the housing 103 is also provided with a top protective plate 101. A pressure relief channel b is provided between the top protective plate 101 and the second cold plate 5 so that the battery pack can quickly discharge high-temperature fumes in the event of thermal runaway of the battery cell 3.

[0067] For example, to monitor for leaks in the receiving cavity a, a detection unit is provided in the receiving cavity a in this embodiment. The detection unit is used to detect whether gas has entered the receiving cavity a. By setting the detection unit in the receiving cavity a, after a coolant leak occurs in the receiving cavity a, the detection unit can detect the entry of gas. Combined with other devices, it can limit the use of the battery pack or remind the user, and assist in detecting whether the battery pack is damaged due to impact, preventing potential accidents. Specifically, the detection unit can be set at the four horizontal corners of the receiving cavity a. After gas enters the receiving cavity a, it will move towards the highest point under the influence of gravity of the coolant, making the four corners of the receiving cavity a easier location for gas detection. The detection unit can be connected to the battery pack's BMS (Battery Management System). When the detection unit detects gas, it can trigger an alarm or actively cut off power in conjunction with the BMS to prevent further damage to the battery pack or safety accidents.

[0068] In detail, the detection unit can employ either a capacitive level sensor or a pressure sensor. A capacitive level sensor utilizes the capacitance effect between two electrodes and the liquid; when gas enters between the electrodes, it causes a change in capacitance, thus detecting the presence of air. For a pressure sensor, the presence of gas typically causes localized pressure changes; monitoring abnormal pressure fluctuations can indirectly determine whether gas has entered the containment chamber a. Alternatively, observing whether there is leakage at the protective plate 101 can determine if there is damage to the bottom of the battery pack.

[0069] In this embodiment of the battery pack, not only can the first cold plate 2 cool the battery cell 3, but by setting up a receiving cavity a formed by the first cold plate 2 and the housing 1, and filling the receiving cavity a with coolant, the coolant can exchange heat with the protrusion of the battery cell 3 embedded in the receiving cavity a. At the same time, the heat-conducting part can quickly absorb heat from the protrusion of the battery cell 3 and release heat to the coolant, and the coolant is finally cooled down through the housing 1 and the first cold plate 2 in contact with it. Compared with the conventional technology that only sets up a cold plate for cooling the battery cell 3, this increases the heat dissipation path of the battery cell 3, improves the heat dissipation speed of the battery cell 3, and is beneficial to improving the heat dissipation capacity of the battery pack.

[0070] Example 2

[0071] This embodiment relates to a battery pack, which differs from the battery pack in Embodiment 1 in that the structure of the battery cell 3 is different, the arrangement of the battery cell 3 is different, and the structure of the second cold plate 5 is different.

[0072] Reference Figure 5 As shown, in this embodiment, multiple battery cells 3 are divided into at least one group. Each group of battery cells 3 includes two rows of battery cells 3, and a pressure relief channel b is formed between the two rows of battery cells 3 in each group. Each group's two rows of battery cells 3 include multiple battery cells 3 arranged along the length of the pressure relief channel b. The explosion-proof valve 302 of each battery cell 3 is positioned facing the pressure relief channel b. Correspondingly, compared to the second cold plate 5 in Embodiment 1, the second cold plate 5 in this embodiment does not have a discharge hole 501 and is tightly connected to the battery cells 3 by thermally conductive structural adhesive.

[0073] Grouping the battery cells 3 into groups and setting pressure relief channels b between each group of battery cells 3 can provide a directional discharge path for the high-temperature delay and molten material ejected from the thermal runaway of the battery cells 3, reducing the pressure accumulation inside the battery pack. All explosion-proof valves 302 face the channels, which can ensure the concentrated discharge of high-temperature fumes, avoid battery pack deformation or rupture caused by local pressure overload, and improve the safety of battery pack use.

[0074] Example 3

[0075] This embodiment relates to an electrical device, which is equipped with a battery pack as described in Embodiment 1 or Embodiment 2.

[0076] By setting up the first cold plate 2, the second cold plate 5 and the related heat dissipation structure of the receiving cavity a, the temperature of the cell 3 can be reduced relatively quickly, reducing the impact of high temperature on the performance of the battery pack. Furthermore, good heat dissipation and temperature control help extend the service life of the battery pack and maintain high charging and discharging efficiency.

[0077] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1.A battery pack, characterized in that: comprising a shell, and a first cold plate, a heat-conducting part and a cell arranged in the shell; a containing cavity is formed between the first cold plate and the shell, and the containing cavity is used to fill cooling liquid; a through hole is arranged on the first cold plate, and a protruding part is arranged on the cell, the protruding part penetrates through the through hole and is embedded in the containing cavity; the heat-conducting part is arranged in the containing cavity, and the heat-conducting part is connected with the protruding part. 2.The battery pack according to claim 1, characterized in that: the protruding part comprises a pole of the cell, the heat-conducting part comprises a busbar connected with the pole, and the cooling liquid is an insulating cooling liquid. 3.The battery pack according to claim 2, characterized in that: the cell is a cell with poles on the same side, and the poles on the same side are embedded in the containing cavity. 4.The battery pack according to claim 1, characterized in that: the battery pack further comprises a second cold plate used for heat exchange with the cell, and the first cold plate and the second cold plate are arranged on two sides of the cell. 5.The battery pack according to claim 4, characterized in that: an explosion-proof valve is arranged on a side of the cell facing the second cold plate, and a discharge hole corresponding to the explosion-proof valve is arranged on the second cold plate. 6.The battery pack according to claim 1, characterized in that: a plurality of the cells are divided into at least one group, each group of the cells comprises two rows of the cells, a pressure relief channel is formed between the two rows of the cells in each group, and each group of the two rows of the cells comprises a plurality of the cells arranged along the length direction of the pressure relief channel, and the explosion-proof valve of each cell is arranged towards the pressure relief channel. 7.The battery pack according to claim 1, characterized in that: a sealing glue is arranged between the cell and the first cold plate, and the sealing glue is used to seal the gap between the protruding part and the through hole. 8.The battery pack according to claim 1, characterized in that: a detection part is arranged in the containing cavity, and the detection part is used to detect whether gas enters the containing cavity. 9.The battery pack according to any one of claims 1 to 8, characterized in that: the shell comprises a guard plate arranged at a distance from the first cold plate, the first cold plate and the guard plate are connected through a sealing part, and the first cold plate, the guard plate and the sealing part form the containing cavity. 10.An electric device, characterized in that: the electric device is provided with the battery pack according to any one of claims 1 to 9. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Images