Battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery pack and electric equipment, the battery pack comprises a shell, a battery cell module and a bottom protection plate, the shell is provided with a first accommodating cavity, and the battery cell module is located in the first accommodating cavity. The bottom protection plate is located at the bottom of the shell and provided with a second containing cavity. A pressure sensor is at least arranged in the second containing cavity and at least used for detecting the air pressure in the second containing cavity. The pressure sensor can detect the change of the air pressure in the second containing cavity in time, and a user can find that the bottom protection plate is damaged in time according to the air pressure value detected by the pressure sensor so that the bottom protection plate can be replaced in time. Therefore, continuous use of the battery pack under the condition that the bottom protective plate is split can be reduced or avoided, and potential safety hazards caused by long-term use of the battery pack under the condition that the bottom protective plate is broken can be prevented, so that the safety of the battery pack is improved, and the potential safety hazards of the battery pack are reduced.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery pack and an electrical device. Background Art

[0002] With the continuous enhancement of people's environmental awareness, new energy vehicles are increasingly favored by people. New energy vehicles use batteries as the power source, with low usage costs, no exhaust emissions, and being environmentally friendly.

[0003] New energy vehicles generally include a battery pack and an electric motor. The battery pack is electrically connected to the electric motor, and the battery pack can supply power to the electric motor so that the electric motor can drive the vehicle to travel. The battery pack includes a housing and a battery cell module located inside the housing. A bottom guard plate is also provided at the bottom of the housing. The bottom guard plate and the housing are used to provide protection for the battery pack to reduce or avoid damage to the battery pack under external forces. However, when the bottom guard plate itself is damaged under external forces, it is usually not detected in time. If the damaged bottom guard plate continues to be used, it will increase the safety hazard of the battery pack. Utility Model Content

[0004] This application provides a battery pack and an electrical device, which can prevent the battery pack from having safety hazards during long-term use when the bottom guard plate is broken, can effectively improve the safety of the battery pack, and reduce the safety hazard of the battery pack.

[0005] One aspect of this application provides a battery pack, including:

[0006] A housing having a first accommodation cavity;

[0007] A battery cell module located in the first accommodation cavity;

[0008] A bottom guard plate located at the bottom of the housing and on the side of the housing facing away from the first accommodation cavity. A second accommodation cavity is formed by surrounding between the bottom guard plate and the housing;

[0009] At least a pressure sensor is provided in the second accommodation cavity, and the pressure sensor is at least used to detect the air pressure in the second accommodation cavity.

[0010] In the embodiments of the present application, by arranging a pressure sensor at least in the second accommodation cavity formed by the bottom guard plate, when the bottom guard plate is broken, it will cause a change in the air pressure in the second accommodation cavity. The pressure sensor can detect the change in the air pressure in the second accommodation cavity in a timely manner. At this time, the user can discover that the bottom guard plate is damaged in a timely manner according to the air pressure value detected by the pressure sensor, so that the user can replace the bottom guard plate in a timely manner. This can reduce or avoid the continuous use of the battery pack in the case of the bottom guard plate splitting, and can prevent potential safety hazards from occurring when the battery pack is used for a long time in the case of the bottom guard plate breaking, thereby improving the safety of the battery pack and reducing the potential safety hazards of the battery pack.

[0011] In a possible implementation manner, the pressure sensor is arranged in both the first accommodation cavity and the second accommodation cavity.

[0012] In a possible implementation manner, the air pressure in the second accommodation cavity is greater than the atmospheric pressure.

[0013] In a possible implementation manner, the air pressure in the first accommodation cavity is not equal to the air pressure in the second accommodation cavity.

[0014] In a possible implementation manner, the air pressure in the first accommodation cavity is less than the air pressure in the second accommodation cavity.

[0015] In a possible implementation manner, the air pressure in the first accommodation cavity is greater than or equal to the atmospheric pressure.

[0016] In a possible implementation manner, the air pressure in the first accommodation cavity is greater than the air pressure in the second accommodation cavity.

[0017] In a possible implementation manner, it further includes a control device. The pressure sensor is electrically connected to the control device. The pressure sensor is used to transmit the detected air pressure value to the control device, and the control device is used to emit an alarm sound when the air pressure value detected by the pressure sensor changes.

[0018] In a possible implementation manner, the bottom guard plate includes:

[0019] A bottom case, which is hermetically connected to the housing, and the second accommodation cavity is formed between the bottom case and the housing;

[0020] A buffer layer, which is located in the second accommodation cavity and at the bottom of the bottom case.

[0021] In a possible implementation manner, the pressure sensor in the second accommodation cavity is located in the buffer layer.

[0022] In a possible implementation, the bottom case is connected to the housing through fasteners. The pressure sensor in the second accommodation cavity is disposed close to the fasteners, and the strength of the fasteners is greater than the strength of the pressure sensor housing.

[0023] In a possible implementation, a sealing ring is further included. The sealing ring is located between the bottom case and the housing, and is used to provide a seal between the bottom case and the housing.

[0024] In a possible implementation, the buffer layer is made of aluminum foam or aluminum honeycomb.

[0025] In a possible implementation, the first accommodation cavity includes a plurality of sub-cavities, and the battery cell modules are respectively located in each of the sub-cavities;

[0026] A pressure sensor is disposed in each of the sub-cavities, and the pressure sensor is located on the side wall of the sub-cavity.

[0027] In a possible implementation, at least two or more of the pressure sensors are disposed in the second accommodation cavity, and the pressure sensors are evenly distributed along the length direction of the second accommodation cavity.

[0028] A second aspect of the present application provides an electrical device, including the battery pack described in any one of the above. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 It is a schematic structural diagram of a battery pack provided by an embodiment of the present application;

[0031] Figure 2 It is an exploded view of a battery pack provided by an embodiment of the present application;

[0032] Figure 3 It is a schematic structural diagram of a lower housing provided by an embodiment of the present application;

[0033] Figure 4 It is an exploded schematic diagram of a lower housing provided by an embodiment of the present application;

[0034] Figure 5 It is a schematic structural diagram of a bottom guard plate provided by an embodiment of the present application;

[0035] Figure 6 The first alarm logic schematic diagram provided by the embodiment of the present application;

[0036] Figure 7 The second alarm logic schematic diagram provided by the embodiment of the present application;

[0037] Figure 8 The third alarm logic schematic diagram provided by the embodiment of the present application;

[0038] Figure 9 The fourth alarm logic schematic diagram provided by the embodiment of the present application;

[0039] Figure 10 The fifth alarm logic schematic diagram provided by the embodiment of the present application;

[0040] Figure 11 The sixth alarm logic schematic diagram provided by the embodiment of the present application;

[0041] Figure 12 The seventh alarm logic schematic diagram provided by the embodiment of the present application;

[0042] Figure 13 The eighth alarm logic schematic diagram provided by the embodiment of the present application;

[0043] Figure 14 The ninth alarm logic schematic diagram provided by the embodiment of the present application;

[0044] Figure 15 The tenth alarm logic schematic diagram provided by the embodiment of the present application;

[0045] Figure 16 The eleventh alarm logic schematic diagram provided by the embodiment of the present application;

[0046] Figure 17 The twelfth alarm logic schematic diagram provided by the embodiment of the present application;

[0047] Figure 18 The exploded view of a bottom guard plate provided by the embodiment of the present application;

[0048] Figure 19 The partial cross-sectional view of a bottom guard plate provided by the embodiment of the present application.

[0049] Reference numerals

[0050] 100 - Battery pack;

[0051] 110 - Housing;

[0052] 111 - First accommodation cavity; 1111 - Sub - cavity; 112 - Lower housing; 1121 - Bottom plate; 1122 - Side plate;

[0053] 113 - Cover plate;

[0054] 120 - Battery cell module;

[0055] 130 - Bottom protection plate;

[0056] 131 - Second accommodation cavity; 132 - Bottom case; 133 - Buffer layer; 134 - Sealing ring;

[0057] 140 - Sensor;

[0058] 141 - First pressure sensor; 142 - Second pressure sensor;

[0059] 150 - Fastener. Detailed implementation manners

[0060] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0061] The embodiments of the present application provide a battery pack and an electrical device including the battery pack. Among them, the electrical device can be a vehicle or an energy storage device. For example, the vehicle can be a sedan, a bus, or a truck. For example, the vehicle can be an electric vehicle (EV), a pure electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), a new energy vehicle, and any vehicle with a battery.

[0062] The following takes the electrical device as a vehicle as an example for illustration.

[0063] The vehicle may further include a vehicle body, an axle, and a motor. Among them, the battery pack, the axle, and the motor may all be disposed on the vehicle body. The battery pack may be electrically connected to the motor, the motor may be connected to the axle, and the battery pack may supply power to the motor so that the motor can rotate. During the rotation of the motor, the motor can drive the axle to rotate, thereby enabling the vehicle to travel.

[0064] Among them, the vehicle body may include a vehicle chassis and a vehicle body disposed on the chassis. The vehicle body may have a passenger compartment, and a driver's seat, passenger seats, etc. may be disposed in the passenger compartment. The driver may sit on the driver's seat to operate the vehicle. For example, structural components such as a steering wheel, a clutch, and a brake may also be disposed on the vehicle body to enable the vehicle to achieve complete functions. This application does not make any limitations.

[0065] In the related art, the battery pack includes a housing and a battery cell module located inside the housing. A bottom guard plate is further disposed at the bottom of the housing. The bottom guard plate and the housing are used to provide protection for the battery pack to reduce or avoid damage to the battery pack under external forces. However, when the bottom guard plate itself is damaged under external forces, it is usually not detected in time. If the damaged bottom guard plate continues to be used, it will increase the safety hazard of the battery pack.

[0066] To solve the above problems, an embodiment of the present application provides a battery pack. By at least disposing a pressure sensor in a second accommodation cavity formed by the bottom guard plate, when the bottom guard plate is cracked, it will cause a change in the air pressure in the second accommodation cavity. The pressure sensor can detect the change in the air pressure in the second accommodation cavity in time. At this time, the user can timely judge whether the bottom guard plate is damaged according to the air pressure value detected by the pressure sensor, so that the user can timely replace the bottom guard plate. This can reduce or avoid the continuous use of the battery pack in the case of the splitting of the bottom guard plate, and can prevent the battery pack from having safety hazards due to long-term use in the case of the cracking of the bottom guard plate, thereby improving the safety of the battery pack and reducing the safety hazard of the battery pack.

[0067] The battery pack provided by the embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0068] Figure 1 It is a schematic structural diagram of a battery pack provided by an embodiment of the present application. Figure 2 It is an exploded view of a battery pack provided by an embodiment of the present application.

[0069] An embodiment of the present application provides a battery pack 100. Refer to Figure 1 and Figure 2As shown in the figure, the battery pack 100 may include a housing 110, a battery cell module 120, and a bottom guard plate 130. The housing 110 may have a first accommodation cavity 111, and the battery cell module 120 may be located within the first accommodation cavity 111. For example, the housing 110 may include a lower housing 112 and a cover plate 113. The cover plate 113 may be disposed on the lower housing 112, and the first accommodation cavity 111 may be formed by enclosing between the cover plate 113 and the lower housing 112. Among them, the lower housing 112 may include a bottom plate 1121 and side plates 1122 surrounding the bottom plate 1121, and the first accommodation cavity 111 may be formed by enclosing between the bottom plate 1121 and the side plates 1122. The housing 110 may provide an accommodation space for the battery cell module 120 to protect the battery cell module 120.

[0070] The bottom guard plate 130 may be located at the bottom of the housing 110 and on a side of the housing 110 facing away from the first accommodation cavity 111. For example, the bottom guard plate 130 may be located on a surface of the lower housing 112 facing away from the first accommodation cavity 111 and connected to the lower housing 112. For example, the bottom guard plate 130 may be connected to the bottom plate 1121 in the lower housing 112.

[0071] A second accommodation cavity 131 may be formed by enclosing between the bottom guard plate 130 and the housing 110. For example, the bottom guard plate 130 may have a groove, and the second accommodation cavity 131 may be formed by enclosing between the bottom guard plate 130 and the bottom plate 1121 of the lower housing 112. Among them, at least a pressure sensor 140 is disposed in the second accommodation cavity 131, and the pressure sensor 140 is at least used to detect the air pressure in the second accommodation cavity 131. For example, the pressure sensor 140 may be disposed only in the second accommodation cavity 131, or the pressure sensor 140 may also be disposed in both the first accommodation cavity 111 and the second accommodation cavity 131.

[0072] For example, when the pressure sensor 140 is disposed in the second accommodation cavity 131, the pressure sensor 140 may detect the air pressure in the second accommodation cavity 131 in real time. When the bottom guard plate 130 is cracked, it will cause a change in the air pressure in the second accommodation cavity 131, and the pressure sensor 140 can detect the change in the air pressure in the second accommodation cavity 131 in time. At this time, the user can judge whether the bottom guard plate 130 is damaged according to the air pressure value detected by the pressure sensor 140 in time, so that the user can replace the bottom guard plate 130 in time. This can reduce or avoid the continued use of the battery pack 100 in the case of the splitting of the bottom guard plate 130, and can prevent potential safety hazards from occurring when the battery pack 100 is used for a long time in the case of the cracking of the bottom guard plate 130, thereby improving the safety of the battery pack 100 and reducing the potential safety hazards of the battery pack 100.

[0073] Figure 3 The figure is a schematic structural diagram of a lower housing provided by an embodiment of the present application. Figure 4Exploded view of a lower housing provided by an embodiment of the present application Figure 5 Structural diagram of a bottom guard plate provided by an embodiment of the present application

[0074] For example, in some examples, pressure sensors 140 may be provided in both the first accommodation cavity 111 and the second accommodation cavity 131. For example, see Figure 3 and Figure 4 , the pressure sensor 140 in the first accommodation cavity 111 may be the first pressure sensor 141, and the first pressure sensor 141 may detect the air pressure in the first accommodation cavity 111. For example, the first accommodation cavity 111 may include a plurality of sub-cavities 1111, and the battery cell module 120 may be located in each sub-cavity 1111 respectively. A pressure sensor 140 (i.e., the first pressure sensor 141) may be provided in each sub-cavity 1111, and the first pressure sensor 141 may be located on the side wall of the sub-cavity 1111.

[0075] In this way, multiple first pressure sensors 141 can respectively detect the air pressure in the first accommodation cavity 111. When the battery cell module 120 in one of the sub-cavities 1111 has a thermal failure, its corresponding first pressure sensor 141 can timely detect the air pressure in the cavity to remind the user. It can effectively improve the sensitivity of detecting the air pressure in the first accommodation cavity 111 and enhance the accuracy of detection.

[0076] See Figure 5 As shown, the pressure sensor 140 in the second accommodation cavity 131 may be the second pressure sensor 142. The second pressure sensor 142 may detect the air pressure in the second accommodation cavity 131. For example, at least 2 or more pressure sensors 140 (i.e., the second pressure sensor 142) may be provided in the second accommodation cavity 131. For example, 2, 3, or 4 first pressure sensors 141 may be provided in the second accommodation cavity 131, and the pressure sensors 140 (i.e., the second pressure sensor 142) may be evenly distributed along the length direction of the second accommodation cavity 131. This can improve the uniformity of the distribution of the second pressure sensor 142 in the second accommodation cavity 131 and can improve the sensitivity and accuracy of the second pressure sensor 142 in detecting the air pressure in the second accommodation cavity 131.

[0077] When the bottom guard plate 130 is cracked, it will cause a change in the air pressure in the second accommodation cavity 131. The second pressure sensor 142 can detect the change in the air pressure in the second accommodation cavity 131. At this time, the user can find that the bottom guard plate 130 is damaged according to the air pressure value detected by the second pressure sensor 142, so that the user can replace the bottom guard plate 130 to prevent the battery pack 100 from being used under the damaged bottom guard plate 130 and causing a safety accident, thereby effectively improving the safety of the battery pack 100.

[0078] Correspondingly, when both the bottom guard plate 130 and the housing 110 are damaged, the air pressures in the first accommodation cavity 111 and the second accommodation cavity 131 will both change. The first pressure sensor 141 and the second pressure sensor 142 can respectively detect the change in the air pressure in the first accommodation cavity 111 and the second accommodation cavity 131. The user can timely discover the damage of the housing 110 and the bottom guard plate 130 according to the air pressure values detected by the first pressure sensor 141 and the second pressure sensor 142, so that the user can replace the housing 110 and the bottom guard plate 130. This can prevent the battery pack 100 from having a safety accident when used with a damaged housing 110 and bottom guard plate 130, thereby effectively improving the safety of the battery pack 100.

[0079] Alternatively, when the battery cell model in the housing 110 undergoes a thermal runaway, the air pressure in the first accommodation cavity 111 will also change. Specifically, when the battery cell model undergoes a thermal runaway, a large amount of heat will be generated, causing the air pressure in the first accommodation cavity 111 to increase rapidly. At this time, based on the fact that the first pressure sensor 141 detects a relatively rapid increase in the air pressure in the first accommodation cavity 111, the user can determine that the battery cell module 120 has undergone a thermal runaway and can stay away from the battery pack 100 in time to ensure personal safety.

[0080] In the embodiment of the present application, the battery pack 100 may further include a control device. The control device can be electrically connected to the pressure sensor 140. The pressure sensor 140 can be used to transmit the detected air pressure value to the control device, and the control device is used to emit an alarm sound when the air pressure value detected by the pressure sensor 140 changes.

[0081] For example, the control device can be electrically connected to both the first pressure sensor 141 and the second pressure sensor 142. The first pressure sensor 141 and the second pressure sensor 142 can transmit the detected air pressure to the control device, and the control device can emit an alarm sound when the air pressure value detected by the first pressure sensor 141 or the second pressure sensor 142 changes. In this way, when the air pressure in the first accommodation cavity 111 or the second accommodation cavity 131 changes, the control device can recognize that the air pressure value detected by the first pressure sensor 141 or the second pressure sensor 142 has changed and can emit an alarm sound in time to remind the user to replace the bottom guard plate 130, which can effectively improve the response speed.

[0082] Among them, the air pressure in the second accommodation cavity 131 can be greater than the atmospheric pressure. In this way, when the bottom guard plate 130 is broken, the second accommodation cavity 131 will communicate with the outside through the break of the bottom guard plate 130. Since the air pressure in the second accommodation cavity 131 is greater than the atmospheric pressure, the gas in the second accommodation cavity 131 will flow to the outside through the break, so that the air pressure in the second accommodation cavity 131 will rapidly decrease. At this time, the second pressure sensor 142 detects the decrease in the air pressure in the second accommodation cavity 131 and can timely remind the user so that the user can replace the bottom guard plate 130 in time.

[0083] The air pressure values in the first accommodation cavity 111 and the second accommodation cavity 131 can be different. In this way, when the housing 110 is broken, for example, when the bottom plate 1121 of the housing 110 is broken, the first accommodation cavity 111 and the second accommodation cavity 131 can be connected through the break. At this time, the gas in the accommodation cavity with a higher air pressure can flow to the accommodation cavity with a lower air pressure, so that the air pressure in one of the two accommodation cavities increases and the other decreases. Thus, the first pressure sensor 141 and the second pressure sensor 142 can detect the change in the air pressure values in the first accommodation cavity 111 and the second accommodation cavity 131, so that the control device can emit an alarm sound according to the change in the air pressure value to timely remind the user.

[0084] Figure 6 This is the first alarm logic schematic diagram provided by the embodiment of the present application. Figure 7 This is the second alarm logic schematic diagram provided by the embodiment of the present application. Figure 8 This is the third alarm logic schematic diagram provided by the embodiment of the present application. Figure 9 This is the fourth alarm logic schematic diagram provided by the embodiment of the present application.

[0085] For example, in a possible implementation manner, the air pressure in the first accommodation cavity 111 can be greater than the air pressure in the second accommodation cavity 131, that is, the air pressures in both the first accommodation cavity 111 and the second accommodation cavity 131 are greater than the atmospheric pressure (that is, both the first accommodation cavity 111 and the second accommodation cavity 131 are under positive pressure), and the air pressure in the first accommodation cavity 111 is greater than the air pressure in the second accommodation cavity 131.

[0086] In the above air pressure situation, refer to Figure 6 As shown, when the bottom guard plate 130 is broken under external impact, the second accommodation cavity 131 will communicate with the outside through the break of the bottom guard plate 130. Since the air pressure in the second accommodation cavity 131 is greater than the atmospheric pressure, the gas in the second accommodation cavity 131 will flow to the outside through the break, so that the air pressure in the second accommodation cavity 131 will rapidly decrease. At this time, the second pressure sensor 142 detects the decrease in the air pressure in the second accommodation cavity 131 and can timely remind the user through the control device so that the user can replace the bottom guard plate 130 in time.

[0087] See Figure 7 As shown, when both the bottom guard plate 130 and the housing 110 are ruptured, the second accommodation cavity 131 will communicate with the outside through the rupture of the bottom guard plate 130, and the first accommodation cavity 111 and the second accommodation cavity 131 will communicate through the rupture of the housing 110. Due to the air pressure differences between the first accommodation cavity 111, the second accommodation cavity 131, and the atmospheric pressure, the gas in the second accommodation cavity 131 will flow towards the outside, and the low pressure in the second accommodation cavity 131 will decrease accordingly. The gas in the first accommodation cavity 111 will flow towards the second accommodation cavity 131, and the air pressure in the first accommodation cavity 111 will also decrease accordingly. At this time, the first pressure sensor 141 and the second pressure sensor 142 detect the decrease in air pressure in the first accommodation cavity 111 and the second accommodation cavity 131, and can timely remind the user through the control device that both the housing 110 and the bottom guard plate 130 are ruptured, so that the user can replace the battery pack 100 in time.

[0088] See Figure 8 As shown, when both the bottom guard plate 130 and the housing 110 are ruptured and the battery cell module 120 undergoes thermal runaway, the second accommodation cavity 131 will communicate with the outside through the rupture of the bottom guard plate 130, and the first accommodation cavity 111 and the second accommodation cavity 131 will communicate through the rupture of the housing 110. Since the air pressure in the second accommodation cavity 131 is greater than the atmospheric pressure, the gas in the second accommodation cavity 131 will flow out to the outside through the rupture, thereby rapidly reducing the air pressure in the second accommodation cavity 131. At this time, the second pressure sensor 142 detects the decrease in air pressure in the second accommodation cavity 131. When the battery cell module 120 undergoes thermal runaway, a large amount of heat and gas will be generated. Part of the gas can be ejected through the explosion-proof valve, and part of it will enter the second accommodation cavity 131 through the rupture of the housing 110 and flow out to the outside through the rupture of the bottom guard plate 130. This causes the air pressure in the first accommodation cavity 111 to increase slowly, and the first pressure sensor 141 detects the increase in air pressure in the first accommodation cavity 111. In this case, the first pressure sensor 141 and the second pressure sensor 142 can remind the user through the control device that both the bottom guard plate 130 and the housing 110 are ruptured and the battery cell module 120 is out of control, prompting the user to quickly escape so that the user can stay away from the battery pack 100 in time.

[0089] See Figure 9As shown, when neither the bottom guard plate 130 nor the housing 110 is cracked, and only the battery cell module 120 experiences thermal runaway, a large amount of heat and gas will be generated during the thermal runaway of the battery cell module 120. Part of the gas can be ejected through the explosion-proof valve, and the remaining gas can cause the air pressure in the first accommodation cavity 111 to increase rapidly. The increase in the air pressure in the first accommodation cavity 111 detected by the first pressure sensor 141 can remind the user through the control device that the battery cell module 120 has experienced a runaway, prompting the user to escape quickly so that the user can stay away from the battery pack 100 in time.

[0090] Figure 10 It is the fifth alarm logic schematic diagram provided by the embodiment of the present application. Figure 11 It is the sixth alarm logic schematic diagram provided by the embodiment of the present application. Figure 12 It is the seventh alarm logic schematic diagram provided by the embodiment of the present application. Figure 13 It is the eighth alarm logic schematic diagram provided by the embodiment of the present application.

[0091] Alternatively, in another possible implementation, the air pressure in the second accommodation cavity 131 can be greater than the atmospheric pressure, the air pressure in the first accommodation cavity 111 can also be less than the air pressure in the second accommodation cavity 131, and moreover, the air pressure in the first accommodation cavity 111 is equal to the atmospheric pressure. That is to say, the second accommodation cavity 131 is under positive pressure, and the first accommodation cavity 111 is under atmospheric pressure (also called normal pressure).

[0092] In the above-mentioned air pressure situation, refer to Figure 10 As shown, when the bottom guard plate 130 is cracked under external impact, the second accommodation cavity 131 will communicate with the outside through the crack of the bottom guard plate 130. Since the air pressure in the second accommodation cavity 131 is greater than the atmospheric pressure, the gas in the second accommodation cavity 131 will flow to the outside through the crack, thereby causing the air pressure in the second accommodation cavity 131 to decrease rapidly. At this time, the second pressure sensor 142 detects the decrease in the air pressure in the second accommodation cavity 131 and can promptly remind the user through the control device so that the user can replace the bottom guard plate 130 in time.

[0093] Refer to Figure 11As shown, when both the bottom guard plate 130 and the housing 110 are cracked, the second accommodation cavity 131 will communicate with the outside through the crack of the bottom guard plate 130, and the first accommodation cavity 111 and the second accommodation cavity 131 will communicate through the crack of the housing 110. Since the air pressure in the second accommodation cavity 131 is greater than the air pressure in the first accommodation cavity 111 and the atmospheric pressure outside, the gas in the second accommodation cavity 131 will flow towards the outside and the first accommodation cavity 111 simultaneously. The low pressure in the second accommodation cavity 131 will thus decrease, while the air pressure in the first accommodation cavity 111 will increase slightly. At this time, the first pressure sensor 141 detects an increase in the air pressure in the first accommodation cavity 111, and the second pressure sensor 142 detects a decrease in the air pressure in the second accommodation cavity 131, and can promptly remind the user through the control device that both the housing 110 and the bottom guard plate 130 are cracked, so that the user can replace the battery pack 100 in time.

[0094] See Figure 12 As shown, when both the bottom guard plate 130 and the housing 110 are cracked and the battery cell module 120 undergoes thermal runaway, the second accommodation cavity 131 will communicate with the outside through the crack of the bottom guard plate 130, and the first accommodation cavity 111 and the second accommodation cavity 131 will communicate through the crack of the housing 110. Since the air pressure in the second accommodation cavity 131 is greater than the atmospheric pressure, the gas in the second accommodation cavity 131 will flow out to the outside through the crack, thereby rapidly reducing the air pressure in the second accommodation cavity 131. At this time, the second pressure sensor 142 detects a decrease in the air pressure in the second accommodation cavity 131. When the battery cell module 120 undergoes thermal runaway, a large amount of heat and gas will be generated. Part of the gas can be ejected through the explosion-proof valve, and part of it will enter the second accommodation cavity 131 through the crack of the housing 110 and flow out to the outside through the crack of the bottom guard plate 130. Since the original air pressure in the first accommodation cavity 111 is equal to the atmospheric pressure, the speed at which the explosion-proof valve bursts is relatively slower than in the case where the pressure is greater than the atmospheric pressure. Therefore, in the above situation, the air pressure in the first accommodation cavity 111 rises relatively fast, and the first pressure sensor 141 will detect a rapid increase in the air pressure in the first accommodation cavity 111. In this case, the first pressure sensor 141 and the second pressure sensor 142 can remind the user through the control device that both the bottom guard plate 130 and the housing 110 are cracked and the battery cell module 120 is out of control, prompting the user to quickly escape so that the user can stay away from the battery pack 100 in time.

[0095] See Figure 13As shown, when neither the bottom guard plate 130 nor the housing 110 is cracked, and only the battery cell module 120 experiences thermal runaway, a large amount of heat and gas will be generated during the thermal runaway of the battery cell module 120. Part of the gas can be ejected through the explosion-proof valve, and the remaining gas can cause the air pressure in the first accommodation cavity 111 to increase rapidly. The first pressure sensor 141 detects the increase in the air pressure in the first accommodation cavity 111. The control device can be used to remind the user that the battery cell module 120 has gone out of control, prompting the user to escape quickly so that the user can stay away from the battery pack 100 in time.

[0096] Figure 14 The ninth alarm logic schematic diagram provided by the embodiment of the present application Figure 15 The tenth alarm logic schematic diagram provided by the embodiment of the present application Figure 16 The eleventh alarm logic schematic diagram provided by the embodiment of the present application Figure 17 The twelfth alarm logic schematic diagram provided by the embodiment of the present application.

[0097] In another possible implementation, the air pressure in the second accommodation cavity 131 can be greater than the atmospheric pressure, the air pressure in the first accommodation cavity 111 can also be less than the air pressure in the second accommodation cavity 131, and moreover, the air pressure in the first accommodation cavity 111 is also greater than the atmospheric pressure. That is to say, the air pressures in the first accommodation cavity 111 and the second accommodation cavity 131 are positive pressures, and the air pressure in the second accommodation cavity 131 is greater than the air pressure in the first accommodation cavity 111.

[0098] In the above air pressure situation, refer to Figure 14 As shown, when the bottom guard plate 130 is cracked under external impact, the second accommodation cavity 131 will communicate with the outside through the crack of the bottom guard plate 130. Since the air pressure in the second accommodation cavity 131 is greater than the atmospheric pressure, the gas in the second accommodation cavity 131 will flow to the outside through the crack, thereby causing the air pressure in the second accommodation cavity 131 to decrease rapidly. At this time, the second pressure sensor 142 detects the decrease in the air pressure in the second accommodation cavity 131, and can timely remind the user through the control device so that the user can replace the bottom guard plate 130 in time.

[0099] Refer to Figure 15As shown in the figure, when both the bottom guard plate 130 and the housing 110 are cracked, the second accommodation cavity 131 will communicate with the outside through the crack of the bottom guard plate 130, and the first accommodation cavity 111 and the second accommodation cavity 131 will communicate through the crack of the housing 110. Since the air pressure in the second accommodation cavity 131 is greater than the air pressure in the first accommodation cavity 111 and the atmospheric pressure outside, the gas in the second accommodation cavity 131 will flow towards the outside and the first accommodation cavity 111 simultaneously. The low pressure in the second accommodation cavity 131 will thus decrease, while the air pressure in the first accommodation cavity 111 will increase slightly. At this time, the first pressure sensor 141 detects an increase in the air pressure in the first accommodation cavity 111, and the second pressure sensor 142 detects a decrease in the air pressure in the second accommodation cavity 131, and can promptly remind the user through the control device that both the housing 110 and the bottom guard plate 130 are cracked, so that the user can replace the battery pack 100 in time.

[0100] See Figure 16 As shown in the figure, when both the bottom guard plate 130 and the housing 110 are cracked and the battery cell module 120 undergoes thermal runaway, the second accommodation cavity 131 will communicate with the outside through the crack of the bottom guard plate 130, and the first accommodation cavity 111 and the second accommodation cavity 131 will communicate through the crack of the housing 110. Since the air pressure in the second accommodation cavity 131 is greater than the atmospheric pressure, the gas in the second accommodation cavity 131 will flow out to the outside through the crack, thereby rapidly reducing the air pressure in the second accommodation cavity 131. At this time, the second pressure sensor 142 detects a decrease in the air pressure in the second accommodation cavity 131. When the battery cell module 120 undergoes thermal runaway, a large amount of heat and gas will be generated. Part of the gas can be ejected through the explosion-proof valve, and part of it will enter the second accommodation cavity 131 through the crack of the housing 110 and flow out to the outside through the crack of the bottom guard plate 130. Since the original air pressure in the first accommodation cavity 111 is greater than the atmospheric pressure, the speed at which its explosion-proof valve bursts is faster than that in the case where the pressure is equal to the atmospheric pressure. That is, after the battery cells undergo thermal runaway, the gas generated inside will quickly be discharged through the explosion-proof valve and the crack, and a relatively small amount of gas remains in the housing 110. Therefore, in the above situation, the air pressure in the first accommodation cavity 111 will rise slowly, and the first pressure sensor 141 will detect a slight increase in the air pressure in the first accommodation cavity 111. In this case, the first pressure sensor 141 and the second pressure sensor 142 can remind the user through the control device that both the bottom guard plate 130 and the housing 110 are cracked and the battery cell module 120 has gone out of control, prompting the user to escape quickly so that the user can stay away from the battery pack 100 in time.

[0101] See Figure 17As shown, when neither the bottom guard plate 130 nor the housing 110 is cracked, and only the battery cell module 120 undergoes thermal runaway, a large amount of heat and gas will be generated during the thermal runaway of the battery cell module 120. Part of the gas can be ejected through the explosion-proof valve, and the remaining gas can cause the air pressure in the first accommodation cavity 111 to increase rapidly. The first pressure sensor 141 detects the increase in the air pressure in the first accommodation cavity 111. The control device can be used to remind the user that the battery cell module 120 has gone out of control, prompting the user to escape quickly so that the user can stay away from the battery pack 100 in time.

[0102] Figure 18 The figure is an exploded view of a bottom guard plate provided by an embodiment of the present application. Figure 19 The figure is a partial cross-sectional view of a bottom guard plate provided by an embodiment of the present application.

[0103] See Figure 18 As shown, the bottom guard plate 130 may include a bottom shell 132 and a buffer layer 133. The bottom shell 132 may be hermetically connected to the housing 110, and a second accommodation cavity 131 may be formed between the bottom shell 132 and the housing 110. The buffer layer 133 may be located in the second accommodation cavity 131, and the buffer layer 133 may be located at the bottom of the bottom shell 132.

[0104] The buffer layer 133 can provide buffer protection for the battery pack 100. When the battery pack 100 is subjected to an external impact, the buffer layer 133 can absorb the external impact force to reduce the impact force received by the battery pack 100, thereby reducing the probability of damage to the battery pack 100 and enhancing the protection effect of the bottom guard plate 130 on the battery pack 100.

[0105] For example, the buffer layer 133 can be foam aluminum or aluminum honeycomb. Both foam aluminum and aluminum honeycomb have good support and elastic buffer properties, which can effectively improve the protection effect on the battery pack 100. Moreover, foam aluminum and aluminum honeycomb have many mesh holes, which can also facilitate the heat dissipation and cooling of the battery pack 100, contributing to improving the operating safety of the battery pack 100.

[0106] See Figure 19 As shown, the pressure sensor 140 (i.e., the second pressure sensor 142) in the second accommodation cavity 131 can be located in the buffer layer 133. The buffer layer 133 has certain buffer elastic properties and can absorb external impact forces. When the battery pack 100 is subjected to an external impact force, the buffer layer 133 can provide protection for the second pressure sensor 142 to reduce or avoid damage to the second pressure sensor 142, enabling the second pressure sensor 142 to detect the air pressure in the second accommodation cavity 131 in a timely manner to provide detection information for the user.

[0107] Continue to see Figure 18As shown, the bottom case 132 and the housing 110 can be connected by fasteners 150. The pressure sensor 140 (i.e., the second pressure sensor 142) in the second accommodation cavity 131 can be arranged close to the fasteners 150, and the strength of the fasteners 150 can be greater than the strength of the housing of the pressure sensor 140. For example, the fasteners 150 can be structural members with connection functions such as bolt fasteners and rivet members.

[0108] The fasteners 150 can provide rigid protection for the second pressure sensor 142. When the battery pack 100 is subjected to an external impact force, the strength at the fasteners 150 is relatively high and is not easily deformed by extrusion, which can provide good rigid protection for the second pressure sensor 142 to reduce or avoid damage to the second pressure sensor 142 under an external extrusion force, enabling the second pressure sensor 142 to detect the air pressure in the second accommodation cavity 131 in a timely manner so as to provide detection information for the user.

[0109] Continue to refer to Figure 18 As shown, the battery pack 100 can further include a sealing ring 134. The sealing ring 134 can be located between the bottom case 132 and the housing 110, and the sealing ring 134 is used to provide a seal between the bottom case 132 and the housing 110. The sealing ring 134 effectively improves the sealing performance of the second accommodation cavity 131. When no accident occurs to the battery pack 100 (for example, the bottom guard 130 is cracked, etc.), it can effectively improve the stability of the air pressure in the second accommodation cavity 131, and can effectively reduce or avoid air leakage in the second accommodation cavity 131, causing mismeasurement of the second pressure sensor 142, which helps to improve the accuracy of the alarm of the battery pack 100.

[0110] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0111] In the description of the present invention, it should be understood that the terms "including" and "having" used herein and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0112] Unless otherwise clearly defined and limited, the terms "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the connection inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them. Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A battery pack, characterized in that: include: A housing (110), wherein the housing (110) has a first accommodating chamber (111); A battery cell module (120), the battery cell module (120) being located in the first accommodating cavity (111); a bottom guard plate (130), the bottom guard plate (130) being located at the bottom of the shell (110) and at a side of the shell (110) facing away from the first accommodating cavity (111), and a second accommodating cavity (131) being formed between the bottom guard plate (130) and the shell (110); A pressure sensor (140) is provided at least in the second accommodating chamber (131), and the pressure sensor (140) is used at least to detect the air pressure in the second accommodating chamber (131).

2. The battery pack according to claim 1, characterized in that: The pressure sensor (140) is disposed in both the first accommodating chamber (111) and the second accommodating chamber (131).

3. The battery pack according to claim 1 or 2, characterized in that: The air pressure in the second accommodating chamber (131) is greater than the atmospheric pressure.

4. The battery pack according to claim 3, characterized in that: The air pressure in the first accommodating chamber (111) and the air pressure in the second accommodating chamber (131) are different in magnitude.

5. The battery pack according to claim 4, characterized in that: The air pressure in the first accommodating chamber (111) is lower than the air pressure in the second accommodating chamber (131).

6. The battery pack according to claim 5, characterized in that: The air pressure in the first accommodating chamber (111) is greater than or equal to atmospheric pressure.

7. The battery pack according to claim 4, characterized in that: The air pressure in the first accommodating chamber (111) is greater than the air pressure in the second accommodating chamber (131).

8. The battery pack according to claim 1 or 2, characterized in that: It also includes a control device, the pressure sensor (140) is electrically connected to the control device, the pressure sensor (140) is used to transmit the detected air pressure value to the control device, and the control device is used to issue an alarm sound when the air pressure value detected by the pressure sensor (140) changes.

9. The battery pack according to claim 1 or 2, characterized in that: The bottom guard plate (130) comprises: A bottom shell (132), the bottom shell (132) being sealedly connected to the shell (110), and the second accommodating cavity (131) being formed between the bottom shell (132) and the shell (110); A buffer layer (133), the buffer layer (133) is located in the second accommodating cavity (131), and the buffer layer (133) is located at the bottom of the bottom shell (132).

10. The battery pack according to claim 9, characterized in that: The pressure sensor (140) in the second accommodating cavity (131) is located in the buffer layer (133).

11. The battery pack according to claim 10, characterized in that: The bottom shell (132) and the housing (110) are connected via a fastener (150); the pressure sensor (140) in the second accommodating cavity (131) is arranged close to the fastener (150); and the strength of the fastener (150) is greater than the strength of the housing of the pressure sensor (140).

12. The battery pack according to claim 9, characterized in that: It also includes a sealing ring (134), which is located between the bottom shell (132) and the housing (110), and is used to provide sealing between the bottom shell (132) and the housing (110).

13. The battery pack according to claim 9, characterized in that: The buffer layer (133) is foamed aluminum or aluminum honeycomb.

14. The battery pack according to claim 1 or 2, characterized in that: The first accommodating cavity (111) comprises a plurality of sub-cavities, and the battery cell module (120) is located in each of the sub-cavities respectively; The pressure sensor (140) is disposed in each of the sub-cavities, and the pressure sensor (140) is located on the side wall of the sub-cavity.

15. The battery pack according to claim 1 or 2, characterized in that: At least two or more of the pressure sensors (140) are arranged in the second accommodating cavity (131), and the pressure sensors (140) are evenly distributed along the length direction of the second accommodating cavity (131).

16. An electrical equipment, characterized in that: A battery pack comprising any one of claims 1 to 15.

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