Battery pack, energy storage apparatus, and energy storage system

Abstract

The present application relates to the technical field of energy, and provides a battery pack, an energy storage apparatus, and an energy storage system, which are used for implementing the function of liquid leakage detection for a battery pack. The battery pack comprises a box body, a plurality of battery cells, and a liquid leakage detection apparatus. The liquid leakage detection apparatus comprises a first wire, a second wire, a separator, a detection port, and an alarm device. The detection port comprises a first conductive contact and a second conductive contact. The first wire is electrically connected to the first conductive contact, and the second wire is electrically connected to the second conductive contact. The portion of the first wire that extends into the box body comprises a first wire core portion that is exposed, and the portion of the second wire that extends into the box body comprises a second wire core portion that is exposed. The separator separates the first wire core portion from the second wire core portion, and the separator is configured to dissolve when coming into contact with an electrolyte, thus electrically connecting the first wire core portion and the second wire core portion. The alarm device is electrically connected to the first conductive contact and the second conductive contact, and the alarm device sends an alarm signal when the first conductive contact and the second conductive contact are shorted.

Description

Battery pack, energy storage device and energy storage system

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on January 25, 2024, with application number 202410110583.7 and invention name “A battery pack, energy storage device and energy storage system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of energy technology, and in particular to a battery pack, an energy storage device, and an energy storage system. Background Art

[0003] With the continuous development and widespread application of clean energy, battery cells have begun to be widely used in various types of equipment and systems, such as energy storage devices and systems. When used, battery cells are generally integrated into a battery pack (PACK). For example, a battery pack may include a box and multiple battery cells located within the box. Each battery cell includes a battery shell and a positive and negative electrode exposed on the shell.

[0004] Currently, battery cells are prone to leakage (i.e., electrolyte leakage) due to manufacturing defects in the battery cells themselves or damage to the battery cell casing during the battery pack manufacturing process. When a battery cell leaks, it can easily cause a short circuit between two adjacent rows of battery cells, forming a loop. Furthermore, when the potential difference between two adjacent rows of battery cells is high, it can cause an external short circuit or spark in the battery cells, igniting the electrolyte and causing the casing to puncture, ultimately leading to thermal runaway of the battery pack or the spread of thermal runaway.

[0005] Summary of the Invention

[0006] The purpose of this application is to provide a battery pack, an energy storage device and an energy storage system for realizing the leakage detection function of the battery pack.

[0007] In a first aspect, a battery pack is provided, comprising: a housing, a plurality of battery cells, and a leakage detection device. The plurality of battery cells are located within the housing. The leakage detection device comprises a first conductive wire, a second conductive wire, a separator, a detection port, and an alarm. The detection port includes a first conductive contact and a second conductive contact; the first conductive wire is electrically connected to the first conductive contact; the second conductive wire is electrically connected to the second conductive contact; both the first conductive wire and the second conductive wire extend into the housing; the portion of the first conductive wire extending into the housing includes an exposed first core portion, and the portion of the second conductive wire extending into the housing includes an exposed second core portion; the separator separates the first core portion from the second core portion, and is configured to dissolve upon contact with electrolyte, electrically connecting the first core portion to the second core portion and short-circuiting the first and second conductive contacts. The alarm is connected to the detection port and electrically connected to the first and second conductive contacts. The alarm is configured to issue an alarm signal when the first and second conductive contacts short-circuit.

[0008] The phrase "electrically connecting the first core portion to the second core portion" includes at least the following two scenarios: Scenario 1: after at least a portion of the separator is dissolved, the electrolyte indirectly electrically connects the first core portion to the second core portion; and Scenario 2: after at least a portion of the separator is dissolved, the first core portion to the second core portion is directly electrically connected.

[0009] In the battery pack provided in the embodiment of the present application, a simple leakage detection device is added. When the electrolyte leaks in the battery cell, the electrolyte will dissolve at least part of the isolation membrane, so that the first wire core portion is electrically connected to the second wire core portion, the first conductive contact and the second conductive contact are short-circuited, and the alarm sends an alarm signal. The alarm signal may include, for example, a sound signal, an optical signal, a vibration signal, a terminal control signal, etc., but is not limited thereto. Among them, the terminal control signal can be used to control the remote terminal to send a prompt message. In this way, it is possible to quickly detect whether the battery cell is leaking, reduce or eliminate the safety risks after the battery cell leaks, such as the short circuit between two adjacent columns of battery cells to form a loop, the external short circuit or spark of the battery cell, ignition of the electrolyte, the breakdown of the box, and ultimately the risk of thermal runaway of the battery pack or the spread of thermal runaway. The leakage detection device in this embodiment has the advantages of simple structure, low cost and high reliability.

[0010] In some embodiments, the isolation membrane includes a first isolation sub-membrane, and the first isolation sub-membrane is located between the first wire core portion and the second wire core portion. In this embodiment, the first isolation sub-membrane can separate the first wire core portion from the second wire core portion. Exemplarily, the orthographic projection of the first wire core portion on the first isolation sub-membrane and the orthographic projection of the second wire core portion on the first isolation sub-membrane may intersect or not intersect, for example, they may be parallel. In addition, the first isolation sub-membrane can also cooperate with any structural wall in the battery pack to confine one of the first wire core portion and the second wire core portion in an independent closed environment, and the other outside the closed environment. In this way, when the electrolyte dissolves the isolation membrane, the first wire core portion and the second wire core portion can be electrically connected, thereby preventing the problem of misconnection of the first wire core and the second wire core portion caused by many other factors, and improving the accuracy of the leakage detection function.

[0011] In some embodiments, the isolation membrane further includes a second isolation membrane and a third isolation membrane. The second isolation membrane covers the side of the first core facing away from the first isolation membrane, and the third isolation membrane covers the side of the second core facing away from the first isolation membrane. In this embodiment, the first core can be confined to a sealed environment between the first and second isolation membranes, and the second core can be confined to a sealed environment between the first and third isolation membranes. This design allows the first and second cores to be electrically connected only when the electrolyte dissolves the isolation membranes. This prevents misconnection between the first and second cores caused by other factors, thereby improving the accuracy of the leakage detection function.

[0012] In some embodiments, the box body includes a bottom plate, and the bottom plate includes a plurality of guide grooves, the openings of the guide grooves are facing the inside of the box body; the first wire core portion, the second wire core portion, and the isolation membrane separating the first wire core portion from the second wire core portion all extend into the guide grooves. In this embodiment, by providing guide grooves on the bottom plate, on the one hand, when leakage occurs in the battery cell, the electrolyte can flow into the guide grooves, avoiding the electrolyte from short-circuiting between two adjacent columns of battery cells to form a loop, further reducing safety hazards. On the other hand, it is also beneficial for the leaked electrolyte to easily contact the isolation membrane in the guide groove, so that the isolation membrane is quickly dissolved, and the first wire core portion is electrically connected to the second wire core, achieving a fast and effective leakage detection effect.

[0013] In some embodiments, the multiple battery cells are arranged in multiple columns on the base plate, with the multiple columns of battery cells spaced apart along a first direction, the first direction being parallel to the base plate and perpendicular to the column direction of the multiple battery cells; the guide grooves are provided on one or both sides of any column of battery cells along the first direction. In this embodiment, by providing the guide grooves on one or both sides of any column of battery cells along the first direction, electrolyte can flow more easily into the guide grooves in the event of battery cell leakage, thereby reducing safety risks.

[0014] In some embodiments, the guide grooves extend along the row direction of any adjacent row of cells. This arrangement allows the electrolyte to more easily flow into the guide grooves when a cell leaks, rather than into the adjacent row or rows of cells separated by the guide grooves, further improving safety.

[0015] In some embodiments, the first core portion, the second core portion, and the separator located in the flow guide groove all extend along the column direction. This arrangement allows the electrolyte to more easily flow into the flow guide groove and contact the separator when the battery cell leaks, thereby rapidly dissolving the separator and electrically connecting the first core portion and the second core portion, thereby achieving rapid and effective leakage detection.

[0016] In some embodiments, the dissolution time of the separator is less than or equal to 72 hours. In this embodiment, the dissolution time of the separator can be controlled by changing the material and thickness parameters of the separator. By making the dissolution time of the separator less than 72 hours, leakage of the battery cell can be detected more quickly, thereby improving safety.

[0017] In some embodiments, the material of the isolation membrane includes one or more of polyethylene and polytetrafluoroethylene. This configuration allows the isolation membrane to dissolve more quickly after contacting the electrolyte, thereby increasing the speed of leakage detection.

[0018] In some embodiments, the detection port is exposed outside the housing, and the alarm is connected to the detection port from outside the housing. This arrangement makes the alarm less susceptible to electrolyte leakage from within the housing, making alarm failure less likely and improving reliability. It also facilitates maintenance and replacement of the alarm, reducing maintenance costs. The connection method between the alarm and the detection port is not restricted and can be, for example, plug-in, clip-on, or threaded.

[0019] In some embodiments, the battery pack further includes a spare port, wherein the spare port includes the third conductive contact and the fourth conductive contact; the first conductive wire is also electrically connected to the third conductive contact; and the second conductive wire is also electrically connected to the fourth conductive contact. In this embodiment, the alarm can also be connected to the spare port, and an alarm signal is issued when the third conductive contact and the fourth conductive contact are short-circuited. By setting up a spare port, on the one hand, when a fault occurs in the detection port, the spare port can be used to connect the alarm for monitoring, and there will be no monitoring window period; on the other hand, the detection port and the spare port can be used to connect different alarms for monitoring at the same time, thereby improving the accuracy of monitoring and preventing the failure of one of the alarms to detect electrolyte leakage, thereby preventing a greater hazard from occurring. Among them, there is no restriction on the connection method between the alarm and the spare port, for example, it can be plug-in, snap-on, threaded connection, etc.

[0020] In a second aspect, an energy storage device is provided, comprising a plurality of battery packs connected in series or in parallel, wherein at least one of the plurality of battery packs is a battery pack according to any of the preceding embodiments.

[0021] The energy storage device provided in the embodiment of the present application has at least the same beneficial effects as the battery pack in any of the previous embodiments, and thus will not be described in detail here.

[0022] In a third aspect, an energy storage system is provided, comprising an inverter and the energy storage device of the previous embodiment; the inverter is used to convert the direct current output by the energy storage device into alternating current, or to convert the alternating current into direct current and then charge the energy storage device.

[0023] The energy storage system provided in the embodiment of the present application has at least the same beneficial effects as the battery pack in any of the previous embodiments, and thus will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a structural diagram of a battery pack provided in an embodiment of the present application;

[0025] FIG2 is a structural diagram of a box in the battery pack shown in FIG1 ;

[0026] FIG3 is a structural diagram of a cell module in the battery pack shown in FIG1 ;

[0027] FIG4 is a structural diagram of another battery pack provided in an embodiment of the present application;

[0028] FIG5 is a structural diagram of a detection unit provided in an embodiment of the present application;

[0029] FIG6 is a structural diagram of a base plate provided in an embodiment of the present application;

[0030] FIG7 is an exploded view of a base plate provided in an embodiment of the present application;

[0031] FIG8 is a cross-sectional structural diagram of a base plate and a battery cell provided in an embodiment of the present application;

[0032] FIG9 is a cross-sectional structural diagram of a bottom plate, a battery cell, and a lower box frame provided in an embodiment of the present application;

[0033] FIG10 is a structural diagram of an energy storage device provided in an embodiment of the present application;

[0034] FIG11 is a structural diagram of an energy storage system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0036] In the following, the terms "first," "second," etc., are used for descriptive convenience only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first," "second," etc. may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0037] In the embodiments of the present application, unless otherwise clearly specified or limited, the term "electrical connection" may refer to a direct electrical connection or an indirect electrical connection through an intermediate medium.

[0038] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0039] In the embodiments of the present application, "and / or" describes the association relationship between associated objects, indicating that three relationships can exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, and B exists alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0040] In the embodiments of the present application, directional indications such as up, down, left, right, front, and back, used to explain the structure and movement of various components of the present application are relative. These indications are appropriate when the components are in the positions shown in the figures. However, if the description of the component positions changes, these directional indications will also change accordingly.

[0041] FIG1 is a structural diagram of a battery pack 100 provided in an embodiment of the present application, FIG2 is a structural diagram of a housing 101 in the battery pack 100 shown in FIG1 , and FIG3 is a structural diagram of a cell module 102 in the battery pack 100 shown in FIG1 . Cell module 102 is a custom term used to conveniently describe a plurality of cells 1021 arranged in the same column within the battery pack 100 . Furthermore, to facilitate the description of the various embodiments below, an XYZ coordinate system is established in FIG1-3 . For example, the length direction of the battery pack 100 is defined as the X-axis direction (+X is right, -X is left), the width direction of the battery pack 100 is defined as the Y-axis direction (+Y is back, -Y is front), and the height direction of the battery pack 100 is defined as the Z-axis direction (+Z is top, -Z is bottom). It is understood that the coordinate system of the battery pack 100 can be flexibly set according to actual needs and is not subject to excessive restrictions here. It will be understood that Figures 1-3 and the related figures below only schematically illustrate some components included in the battery pack 100, and the actual shape, actual size, actual position and actual structure of these components are not limited to the limitations of Figures 1-3 and the figures below.

[0042] 1-3 , an embodiment of the present application provides a battery pack 100, comprising a housing 101 and a plurality of battery cells 1021, wherein the plurality of battery cells 1021 are located within the housing 101. FIG1 illustrates an example of a case where the plurality of battery cells 1021 are arranged in two rows on the bottom plate 10 of the housing, i.e., arranged into two battery cell modules 102. The number of rows is for illustration only and is not a specific limitation. For example, the number of rows may be one, three, or more.

[0043] In the examples of Figures 1 and 2, a part of the structure of the box 101 is shown, namely the lower box 91, which includes a bottom plate 10 and a lower box frame 20, and the lower box frame 20 is connected to the edge of the bottom plate 10. At this time, for a complete battery pack 100, it can also include an upper box (not shown), the upper box includes a top plate and an upper box frame, and the upper box frame is connected to the edge of the top plate. In this way, when the lower box frame 20 is connected to the upper box frame, a box 101 that can enclose multiple battery cells 1021 can be enclosed together with the top plate and the bottom plate 10. It should be noted that this is only an example of the implementation method of the box 101, that is, in other embodiments, it is also possible to choose to form a box 101 that can enclose multiple battery cells 1021 through other different composition methods, and this application does not limit this.

[0044] As shown in Figure 3, each battery cell 1021 may include a battery cell shell and a positive electrode (+) and a negative electrode (-) exposed on the battery cell shell. Multiple battery cells 1021 can be arranged in sequence along the Y-axis direction, and a row of battery cells 1021 arranged in sequence along the Y-axis direction constitutes a battery cell module 102. In addition, the battery cell module 102 may also include a fixed structure (not shown), such as an upper cover and a lower cover, and the multiple battery cells 1021 in the battery cell module 102 can be clamped and fixed between the upper cover and the lower cover. In the following, for the convenience of explanation, the battery pack 100 will be introduced in conjunction with the custom word battery cell module 102.

[0045] For example, the maximum external short-circuit potential difference of a single battery cell module 102 cannot cause the battery cell shell to be punctured. For example, if the breakdown voltage of the battery cell shell is 80V and lithium iron phosphate batteries are used, the total voltage of a single battery cell module 102 should be less than 80V. In this way, even when the potential difference between adjacent battery cell modules 102 is the highest, the battery cell shell will not be punctured.

[0046] As described in the background art, the inventors of the present application have discovered that the battery cell 1021 is prone to electrolyte leakage. When the battery cell 1021 leaks, it is easy to cause a short circuit between adjacent battery cell modules 102 to form a loop. Moreover, when the potential difference between adjacent battery cell modules 102 is high, it will cause an external short circuit or spark in the battery cell, ignite the electrolyte, and cause the box 101 to be punctured, ultimately leading to thermal runaway or thermal runaway diffusion of the battery pack 100. Moreover, through further research, the inventors of the present application have discovered that the detection schemes on the market for whether the battery cell 1021 has electrolyte leakage all need to be matched with complex leakage detection devices, i.e. algorithms, which have the problems of high cost and low reliability. In addition, in addition to the battery cell 1021 leakage detection alarm, there is a lack of designs that can reduce or eliminate the safety risks after the battery cell 1021 leaks. For example, in response to the problem that the battery cell 1021 is prone to leakage, the solution in the field of power batteries includes: real-time monitoring of the insulation impedance of the battery pack (PACK) through the battery management system (Battery monitor system, BMS). Once the battery cell 1021 leaks and causes insulation abnormality in the battery pack, it can be detected and an alarm is issued, thereby preventing the battery pack 100 from further operation. The detection method used here is the bridge method. However, in the energy storage system, since current conversion is required, if the same detection method is used, it will cause the energy storage system to have level jumps when switching circuits, resulting in false alarms. Therefore, this solution is only applicable to the field of power batteries and not to the field of energy storage.

[0047] In addition, the inventors of the present application have also discovered that in some implementations, in order to adjust the operating temperature of the battery cells 1021 in the housing 101, a liquid cooling design is made for the bottom plate 10 of the housing 101. In this way, the battery cells 1021 can be in the optimal operating temperature range during operation, thereby extending the service life of the battery cells 1021. However, while using a liquid cooling design, it also brings the risk of the bottom plate 10 being prone to leakage. For example, due to the aforementioned problem that the battery cells 1021 are prone to leakage. When the battery cell 1021 leaks, it will cause a short circuit between the battery cell 1021 and the housing 101 to form a loop, thereby causing the bottom plate 10 of the housing 101 to be broken down by high voltage, and the refrigerant in the bottom plate 10 to leak.

[0048] To address at least one of the aforementioned technical issues, the battery pack 100 provided in an embodiment of the present application further includes a leakage detection device 30. Referring to FIG. 4 , FIG. 4 is a structural diagram of another battery pack 100 provided in an embodiment of the present application, wherein the leakage detection device 30 includes a first wire 311 , a second wire 312 , an isolation membrane 313 , a detection port 314 , and an alarm 315 .

[0049] The detection port 314 includes a first conductive contact 3141 and a second conductive contact 3142. The first conductive wire 311 is electrically connected to the first conductive contact 3141, and the second conductive wire 312 is electrically connected to the second conductive contact 3142. Both the first conductive wire 311 and the second conductive wire 312 extend into the housing 101. The portion of the first conductive wire 3111 extending into the housing 101 includes an exposed first conductive wire portion 3111, and the portion of the second conductive wire 3122 extending into the housing 101 includes an exposed second conductive wire portion 3121. An isolation membrane 313 separates the first conductive wire portion 3111 from the second conductive wire portion 3121. The isolation membrane 313 is configured to dissolve upon contact with the electrolyte, electrically connecting the first conductive wire portion 3111 to the second conductive wire portion 3121 and short-circuiting the first conductive contact 3141 and the second conductive contact 3142.

[0050] The alarm 315 is connected to the detection port 314, and the alarm 315 is electrically connected to the first conductive contact 3141 and the second conductive contact 3142. The alarm 315 is used to send an alarm signal when the first conductive contact 3141 and the second conductive contact 3142 are short-circuited. The alarm signal may include, for example, a sound signal, an optical signal, a vibration signal, a terminal control signal, etc., but is not limited thereto. Among them, the terminal control signal can be used to control the remote terminal to send a prompt message, where the prompt information includes sound, picture, light, vibration, etc. In this way, the staff or automatic control equipment can be reminded to cut off the charging and discharging function of the battery pack to reduce safety risks.

[0051] In summary, a simple leakage detection device 30 is added to the battery pack 100 provided in the embodiment of the present application. When the electrolyte leaks from the battery cell 1021, the electrolyte will dissolve at least part of the isolation membrane 313, so that the first wire core 3111 is electrically connected to the second wire core 3121, the first conductive contact 3141 and the second conductive contact 3142 are short-circuited, and the alarm 315 sends an alarm signal. In this way, it is possible to quickly detect whether the battery cell 1021 is leaking, reduce or eliminate the safety risks after the battery cell 1021 leaks, such as the short circuit between two adjacent columns of battery cells 1021 to form a loop, the external short circuit or spark of the battery cell 1021, ignition of the electrolyte, breakdown of the case 101, and ultimately the risk of thermal runaway or thermal runaway spread of the battery pack 100. The leakage detection device 30 in this embodiment has the advantages of simple structure, low cost, and high reliability.

[0052] Exemplarily, the detection port 314 can be exposed outside the housing 101. For example, the detection port 314 can be fixedly embedded in the wall of the housing 101. In this way, the detection port 314 can be conveniently connected to the first wire 311 and the second wire 312 extending into the housing 101. The alarm 315 can be connected to the detection port 314 from the outside of the housing 101. This arrangement makes the alarm 315 less susceptible to the influence of electrolyte leakage from the inside of the housing 101, so that the alarm 315 is less likely to fail, and the reliability is high. It is also convenient to maintain and replace the alarm 315, reducing maintenance costs. Among them, there is no restriction on the connection method between the alarm 315 and the detection port 314. For example, it can be plug-in, clip-on, threaded connection, etc.

[0053] For example, referring to FIG4 , the battery pack 100 may further include a backup port 316, which includes a third conductive contact 3161 and a fourth conductive contact 3162. The first wire 311 is also electrically connected to the third conductive contact 3161, and the second wire 312 is also electrically connected to the fourth conductive contact 3162. In this embodiment, the alarm 315 may also be connected to the backup port 316, and an alarm signal may be issued when the third conductive contact 3161 and the fourth conductive contact 3162 are short-circuited. By providing the backup port 316, on the one hand, when a fault occurs in the detection port 314, the backup port 316 may be used to connect the alarm 315 for monitoring, and there will be no monitoring window period; on the other hand, the detection port 314 and the backup port 316 may be used to connect different alarms 315 for monitoring at the same time, thereby improving the accuracy of monitoring and preventing a situation in which electrolyte leakage is not detected due to a fault in one of the alarms 315, thereby causing greater harm. There is no restriction on the connection method between the alarm 315 and the backup port 316 , and the connection may be, for example, plug-in connection, snap-on connection, threaded connection, etc.

[0054] In the example of FIG4 , the first conductive line 311 may include a first main segment connected between the first conductive contact 3141 and the third conductive contact 3161, and a plurality of first sub-segments connected in parallel to the first main segment. The second conductive line 312 may include a second main segment connected between the second conductive contact 3142 and the fourth conductive contact 3162, and a plurality of second sub-segments connected in parallel to the second main segment. For example, the first main segment and the second main segment may extend along the X-axis, and each first sub-segment and each second sub-segment may extend along the Y-axis.

[0055] On the basis of the above example, illustratively, the first sub-segment can be used as the first wire core portion 3111, the second sub-segment can be used as the second wire core portion 3121, and the first wire core portion 3111, the second wire core portion 3121, and the isolation membrane 313 between the first wire core portion 3111 and the second wire core portion 3121 are defined as a detection portion 310 as a whole. The detection portion 310 here is named only for the convenience of description and has no other restrictive effect. In this way, in addition to the five detection portions 310 exemplarily shown in FIG4 , by arranging the detection portion 310 on the bottom plate 10 and arranging the detection portion 310 on at least one side of each column of battery cells 1021 in the X-axis direction, the detection portion 310 can be used to detect leakage in advance and quickly before the electrolyte short-circuits two adjacent columns of battery cells 1021, thereby increasing practicality and reliability.

[0056] The first wire 311 in the embodiment of the present application can be a conductive core, or it can be a conductive core with an insulating sheath. If it is a conductive core, the first wire 311 extends to the part inside the box 101, and the entire part is the first core part 3111; if it is a conductive core with an insulating sheath, the part of the first wire 311 extending to the part inside the box 101 that is not wrapped by the insulating sheath is the first core part 3111. It can be understood that in either case, the conductive core needs to be connected to the corresponding first conductive contact 3141 (and / or third conductive contact 3161) to realize the function of conductive detection. Similarly, the second wire 312 can be a conductive core, or it can be a conductive core with an insulating sheath. The setting method of the second wire 312 is similar to that of the first wire 311 and will not be repeated here. Among them, the conductive core can be any conductive material such as copper.

[0057] FIG5 is a schematic diagram of a stacking structure of a detection unit 310 provided in an embodiment of the present application.

[0058] In some embodiments, the isolation film 313 includes a first isolation sub-membrane 3131, which is located between the first core portion 3111 and the second core portion 3121. In this embodiment, the first isolation sub-membrane 3131 can separate the first core portion 3111 from the second core portion 3121. For example, the orthographic projection of the first core portion 3111 on the first isolation sub-membrane 3131 and the orthographic projection of the second core portion 3121 on the first isolation sub-membrane 3131 can intersect or not intersect, for example, they can be parallel (see FIG. 4 for the parallel situation). In addition, the first isolating sub-membrane 3131 can also cooperate with any structural wall in the battery pack 100 to confine one of the first wire core 3111 and the second wire core 3121 in an independent closed environment, and confine the other outside the closed environment. In this way, when the electrolyte dissolves the isolating membrane, the first wire core 3111 and the second wire core 3121 can be electrically connected, preventing the problem of misconnection between the first wire core 3111 and the second wire core 3121 caused by many other factors, thereby improving the accuracy of the leakage detection function.

[0059] Based on the above embodiment, the separator 313 illustratively further includes a second separator 3132 and a third separator 3133. The second separator 3132 covers the side of the first core 3111 facing away from the first separator 3131, and the third separator 3133 covers the side of the second core 3121 facing away from the first separator 3131. In this embodiment, the first core 3111 is confined within a sealed environment between the first and second separators 3131 and 3132, while the second core 3121 is confined within a sealed environment between the first and third separators 3131 and 3133. This design allows the first and second cores 3111 and 3121 to be electrically connected only when the electrolyte dissolves the separators. This prevents misconnection between the first and second cores 3111 and 3121 due to other factors, thereby improving the accuracy of leakage detection.

[0060] Exemplarily, the dissolution time of the isolation film 313 is less than or equal to 72 hours. In this embodiment, the dissolution time of the isolation film can be controlled by changing the material and thickness parameters of the isolation film. By setting the dissolution time of the isolation film to less than 72 hours, leakage of the battery cell can be detected more quickly, improving safety. The isolation film 313 here can be any one or more of the first isolation sub-film 3131, the second isolation sub-film 3132, and the third isolation sub-film 3133 described above.

[0061] Exemplarily, the isolation film 313 is configured to dissolve within a first time period after contacting the electrolyte, and the first time period is less than the electrolyte resistance time period of the case 101. For example, the first time period can be less than the electrolyte resistance time period of the bottom plate 10. Here, it should be noted that the electrolyte resistance time period is related to the setting parameters of the battery pack 100. For example, for the battery pack 100, when the time period that the case 101 contacts the electrolyte does not exceed the electrolyte resistance time period, the insulation withstand voltage of the case 101 (such as the insulation withstand voltage of the bottom plate 10) should be greater than or equal to the total voltage of all the battery modules in the case, thereby ensuring that the case 101 (such as the bottom plate 10) will not be broken down. In some examples, the first time period can be set to less than 72 hours. For example, the first time period can also be set to less than 48 hours. For another example, the first time period can also be set to less than 24 hours. For another example, the first time period can also be set to less than 8 hours.

[0062] Illustratively, the material of the isolation membrane 313 can be a polymer film that is not resistant to electrolytes. Illustratively, the material of the isolation membrane 313 can include a combination of one or more of polyethylene and polytetrafluoroethylene. This configuration allows the isolation membrane 313 to dissolve relatively quickly upon contact with the electrolyte, thereby enhancing leakage detection speed. The isolation membrane 313 herein can be any one or more of the first isolation sub-membrane 3131, the second isolation sub-membrane 3132, and the third isolation sub-membrane 3133 described above.

[0063] In the above, the liquid leakage detection device 30 is introduced in detail. Hereinafter, the bottom plate 10 of the box body 101 will be further introduced.

[0064] Figure 6 is a structural diagram of a base plate 10 provided in an embodiment of the present application, Figure 7 is an exploded diagram of a base plate 10 provided in an embodiment of the present application, Figure 8 is a cross-sectional structural diagram of a base plate 10 and a battery cell 1021 provided in an embodiment of the present application, and Figure 9 is a cross-sectional structural diagram of a base plate 10, a battery cell 1021, and a lower box frame 20 provided in an embodiment of the present application.

[0065] To address at least one of the above technical issues, the battery pack 100 provided in the embodiment of the present application further includes multiple guide grooves 40 on the bottom plate 10. It should be noted that in the battery pack 100 provided in the embodiment of the present application, the guide grooves 40 and the leakage detection device 30 can be provided simultaneously or separately, and this application does not impose any restrictions on this. Below, the guide grooves 40 will be described separately, followed by an explanation of the coordination between the guide grooves 40 and the leakage detection device 30.

[0066] As shown in Figures 6-9 , the base plate 10 includes a plurality of flow guide grooves 40, the openings of which face into the housing 101. Multiple rows of battery cells 1021 are arranged in a spaced relationship along a first direction (the X-axis), which is parallel to the base plate 10 and perpendicular to the row direction of the multiple battery cells 1021 (i.e., the Y-axis). A flow guide groove 40 is provided on one or both sides of any row of battery cells 1021 along the first direction.

[0067] The battery pack 100 provided in the embodiment of the present application has guide grooves 40 provided on one or both sides of any column of battery cells 1021 along the first direction. This allows the electrolyte to flow more easily into the guide grooves 40 when the battery cells leak, thereby reducing safety hazards.

[0068] For example, referring to FIG8 , a guide groove 40 is provided between two adjacent rows of battery cells 1021. By providing the guide groove 40 on the bottom plate 10 , with its opening facing into the housing 101 , and positioned between two adjacent rows of battery cells 1021 , electrolyte can flow into the guide groove 40 when a battery cell 1021 leaks, preventing the electrolyte from short-circuiting the two adjacent rows of battery cells 1021 and forming a loop, thereby reducing safety hazards.

[0069] For example, referring to FIG9 , the two outermost columns of battery cells 1021 are defined as a first column of battery cells 1021 and a second column of battery cells 1021. The first sidewall 201 of the housing 101 is located on a side of the first column of battery cells 1021 away from the second column of battery cells 1021, and the second sidewall 202 of the housing 101 is located on a side of the second column of battery cells 1021 away from the first column of battery cells 1021. A guide groove 40 is provided between the first column of battery cells 1021 and the first sidewall 201, and / or a guide groove 40 is provided between the second column of battery cells 1021 and the second sidewall 202. In this embodiment, by providing a guide groove 40 between the first row of battery cells 1021 and the first side wall 201, the connection between the first side wall 201 and the bottom plate 10 can be protected. When a battery cell 1021 leaks, the electrolyte can flow into the guide groove 40 at this location, preventing the electrolyte from leaking out of the box body 101 from the connection between the first side wall 201 and the bottom plate 10. By providing a guide groove 40 between the second row of battery cells 1021 and the second side wall 202, the connection between the second side wall 202 and the bottom plate 10 can be protected. When a battery cell 1021 leaks, the electrolyte can flow into the guide groove 40 at this location, preventing the electrolyte from leaking out of the box body 101 from the connection between the second side wall 202 and the bottom plate 10.

[0070] For example, referring to Figures 6, 8, and 9, the guide grooves 40 extend along the column direction (i.e., the Y-axis direction) of any adjacent column of battery cells 1021. In this embodiment, since the guide grooves 40 extend along the column direction (i.e., the Y-axis direction), they can better prevent short circuits between adjacent columns of battery cells 1021 due to leakage.

[0071] Exemplarily, in the extension direction of the guide groove 40 (i.e., the Y-axis direction), at least one end of the guide groove 40 extends beyond at least one column of battery cells 1021 adjacent to the guide groove 40. In this embodiment, for any guide groove 40, the number of columns of battery cells 1021 adjacent to it can be one or two. Moreover, since each guide groove 40 has two ends in its extension direction, there are multiple arrangement schemes, for example: Scheme 1, one end of the guide groove 40 (one end along the Y-axis direction) extends beyond a column of battery cells 1021 adjacent to the guide groove 40; Scheme 2, one end of the guide groove 40 extends beyond another column of battery cells 1021 adjacent to the guide groove 40; Scheme 3, the other end of the guide groove 40 (the other end along the Y-axis direction) extends beyond a column of battery cells 1021 adjacent to the guide groove 40; Scheme 4, the other end of the guide groove 40 extends beyond another column of battery cells 1021 adjacent to the guide groove 40. Furthermore, the above four solutions can be provided not only individually but also in any combination. In this embodiment, since the end of the guide groove 40 can extend beyond at least one row of battery cells 1021 adjacent to the guide groove 40, separating two adjacent rows of battery cells 1021, when a battery cell 1021 leaks, the electrolyte can be better prevented from short-circuiting the two adjacent rows of battery cells 1021 to form a loop.

[0072] Exemplarily, the flow cross-section of at least one guide groove 40 can be any of semicircular (as shown in Figures 7-9), semi-elliptical, U-shaped, V-shaped, or W-shaped; the flow cross-section is perpendicular to the extension direction of the guide groove 40. This configuration improves the structural strength and reliability of the portion of the base plate 10 that forms the guide groove 40. Furthermore, since the semicircular, semi-elliptical, and U-shaped guide grooves 40 lack sharp corners, they are less susceptible to weak points susceptible to electrolyte corrosion, resulting in higher reliability.

[0073] For example, the portion of the base plate 10 forming the plurality of guide grooves 40 is recessed relative to other portions of the base plate 10, toward the side of the base plate 10 facing away from the battery cells 1021. In this embodiment, the guide grooves 40 can be formed by partially recessing the base plate 10 toward the side facing away from the battery cells 1021. For example, the guide grooves 40 can be formed on the base plate 10 by stamping. This improves the overall strength and reliability of the base plate 10.

[0074] Continuing with Figure 6, in some embodiments, a liquid cooling channel 50 may be provided within the base plate 10. The inlet and outlet of the liquid cooling channel may be located on the same side edge of the base plate 10. In a direction perpendicular to the base plate 10 (i.e., the Z-axis), the liquid cooling channel 50 overlaps with the battery cell module 102. This arrangement allows heat from the battery cell module 102 to be more easily removed by the refrigerant within the liquid cooling channel, improving heat dissipation.

[0075] In some embodiments, as shown in FIG7 , the base plate 10 includes a stacked upper plate 1101 and a lower plate 1102. The liquid-cooling channel 50 is located between the upper plate 1101 and the lower plate 1102. Here, the base plate 10 can be manufactured using a process of inflation and brazing. The lower plate 1102 and the upper plate 1101 in the area of ​​the guide groove 40 must both be designed with grooves and must fit together to ensure that the upper and lower layers are compacted and sealed after the base plate is formed, and that the guide groove 40 does not form a passageway with the liquid-cooling channel 50.

[0076] Exemplarily, referring back to FIG. 6 , the liquid-cooling channel 50 includes a plurality of main channels 510 and a plurality of connecting channels 520 .

[0077] A plurality of main channels 510 are arranged at intervals along the X-axis direction and extend along the Y-axis direction. The main channel 510 includes a first end b1 and a second end b2 that are opposite to each other along the Y-axis direction. For any three adjacent main channels 510, the second main channel 510b is located between the first main channel 510a and the third main channel 510c, the first end b1 of the first main channel 510a is connected to the first end b1 of the second main channel 510b through a connecting channel 520, and the second end b2 of the second main channel 510b is connected to the second end b2 of the third main channel 510c through another connecting channel 520. For example, for any main channel 510, it can also be designed as a plurality of parallel sub-channels according to the heat dissipation requirements of each column of battery cells 1021, and the plurality of parallel sub-channels can be connected in parallel between two connecting channels 520. This is only an example of the liquid cooling channel 50, without too many restrictions.

[0078] The multiple main channels included in the liquid-cooling channel 50 can be located below the multiple columns of battery cells 1021. In this embodiment, the bottom plate 10 including the upper plate 1101 and the lower plate 1102 can be formed by inflation and brazing. Moreover, at the position of the guide groove 40, the upper plate 1101 and the lower plate 1102 can both be designed as grooves and matched to ensure that the upper plate 1101 and the lower plate 1102 can be compacted and sealed, and the guide groove 40 does not form a passage with the liquid-cooling channel 50. In this embodiment, the bottom plate 10 has a simple structure, is easy to manufacture, and is highly practical.

[0079] Based on the above embodiment, for example, the lowest point of the portion of the base plate 10 forming the guide groove 40 is lower than the lowest point of the portion of the base plate 10 forming the liquid-cooling channel 50, as shown in Figure 8. In this embodiment, since the bottom of the guide groove 40 is a double-layer plate, and the bottom of the liquid-cooling channel 50 is a single-layer plate, the lower portion of the base plate 10 forming the guide groove 40 provides better support, making the liquid-cooling channel 50 less likely to collapse and more reliable.

[0080] Exemplarily, the battery cell module 102 extends along the Y-axis direction. In the direction perpendicular to the base plate (i.e., the Z-axis direction), one battery cell module 102 overlaps with at least one main channel 510. For example, in the examples of Figures 8 and 9, one battery cell module 102 overlaps with one main channel 510. Of course, in other examples, one battery cell module 102 may overlap with two, three, or more main channels 510 to further enhance the heat dissipation capability of the battery cell module 102.

[0081] For example, the guide groove 40 extends along the Y-axis and is spaced apart from the main channel 510 along the X-axis. This allows the electrolyte to flow more easily into the guide groove 40 when the battery cell 1021 leaks, thereby improving the safety factor and the detection efficiency of the detector 310.

[0082] For example, as shown in Figures 8 and 9 , along the X-axis, the guide grooves 40 are located on one or both sides of the battery cell module 102. This allows the electrolyte to flow more easily into the guide grooves 40 when the battery cell leaks, improving the safety factor and the detection efficiency of the detection unit.

[0083] For example, the guide grooves 40 and the main channels 510 are arranged alternately in the X-axis direction. In this case, the guide grooves 40 can be located on one side, both sides, or below the cell module 102. This allows the electrolyte to flow more easily into the guide grooves 40 in the event of a cell leak, improving safety and the detection efficiency of the detector.

[0084] In some examples, as shown in Figures 8 and 9, there is a main channel 510 directly below each battery cell module 102, and there is a guide groove 40 on the left and right sides of each battery cell module 102, that is, in this case, a guide groove 40 is also provided between the battery cell module 102 and the lower box frame. In other examples, there is a main channel 510 directly below each battery cell module 102, and there is a guide groove 40 between every two adjacent battery cell modules 102, that is, in this case, no guide groove 40 may be provided between the battery cell module 102 and the lower box frame.

[0085] For example, the length of the guide groove 40 along the Y-axis is less than the length of the main channel 510 along the Y-axis. This configuration makes it less likely that the guide groove 40 will disrupt the continuity of the liquid-cooling channel 50 and less likely to affect the layout range and cooling effect of the liquid-cooling channel 50.

[0086] For example, as shown in FIG7 , the flow cross-section c1 of the guide groove 40 is larger than the flow cross-section c2 of the liquid-cooling channel 50. In this example, because the flow cross-section c1 of the guide groove 40 is larger, the guide groove 40 can accommodate more electrolyte when the battery cell 1021 leaks, effectively preventing adjacent battery cell modules 102 from short-circuiting and forming a loop.

[0087] For example, as shown in FIG7 , the depth d1 of the guide groove 40 is greater than the depth d2 of the liquid-cooling channel 50. In this example, because the depth d1 of the guide groove 40 is set larger, when the battery cell 1021 leaks, the guide groove 40 can accommodate more electrolyte, effectively preventing the problem of short-circuiting adjacent battery cell modules 102 to form a loop.

[0088] For example, along the X-axis, the ends of the cell module 102 do not extend beyond the ends of the adjacent guide groove 40. This allows the electrolyte to flow more easily into the guide groove 40 when the cell leaks, thereby improving the safety factor and the detection efficiency of the detection unit.

[0089] In the above solution with the liquid cooling channel 50 , since the embodiment of the present application can better protect and monitor the leakage of the battery cell, it is not easy for the base plate 10 to be punctured and the refrigerant in the liquid cooling channel 50 to leak.

[0090] In some embodiments, as shown in Figures 6 and 8, the battery pack 100 further includes an insulating protective layer 120, which is disposed on the surface of the bottom plate 10 facing the interior of the housing 101. In this embodiment, the insulating protective layer 120 can be disposed on the surface a1 of the bottom plate 10 facing the interior of the housing 101, excluding the guide groove 40. Of course, it can also be further disposed on the surface a2 of the guide groove 40. In this way, the bottom plate 10 can be more effectively prevented from being punctured when the battery cell 1021 leaks, and the refrigerant in the bottom plate 10 is less likely to leak, further improving the safety factor.

[0091] For example, the surface a1 may be designed to be a plane, and the flatness may be 0.5 mm-1.0 mm.

[0092] Exemplarily, when the insulating protective layer 120 is not in contact with the electrolyte or the duration of contact with the electrolyte is less than or equal to the second duration, the insulating withstand voltage of the insulating protective layer 120 is greater than or equal to the total voltage of all battery cell modules 102 in the box 101; when the duration of contact with the electrolyte by the insulating protective layer 120 is greater than the second duration, the insulating withstand voltage of the insulating protective layer 120 is less than the total voltage of all battery cell modules in the box 101; at this time, the second duration can be understood as the electrolyte resistance duration of the box 101.

[0093] For example, the material of the insulating protective layer 120 may include a combination of one or more of polypropylene, polyphenylene sulfide, and polycarbonate. This configuration can effectively improve the electrolyte resistance of the insulating protective layer 120, for example, by increasing the second duration to greater than 72 hours, 80 hours, 90 hours, or 100 hours, or by increasing the second duration to between 7 and 14 days.

[0094] Exemplarily, the insulating protective layer 120 may be formed by spraying an electrolyte-resistant insulating paint or powder, applying an electrolyte-resistant insulating film, and the like.

[0095] In some embodiments, the battery pack 100 further includes protective adhesive. For example, the protective adhesive can be used to enhance protection at corners, gaps, and other difficult-to-protect interfaces. The protective adhesive can be made of the same material as the insulating protective layer 120.

[0096] For example, as shown in Figures 8 and 9, a protective adhesive 70 can be provided between at least one column of battery cells 1021 and the base plate 10. The protective adhesive 70 can be evenly applied between the battery cell module 102 and the base plate 10. This provides better insulation protection between the battery cell module 102 and the base plate 10.

[0097] For another example, as shown in FIG. 9 , a protective adhesive (not shown) may be provided at the angle between the surface a1 of the bottom plate 10 and the side wall a3 of the box body 101 .

[0098] For another example, a sharp corner can be formed at at least one sharp corner of the base plate 10, for example, in Figure 8, at the junction between the inner surface a2 of the guide groove and the surface a1 of the base plate 10. By setting protective glue (not shown) here, a good protective effect can be achieved.

[0099] Through the above solution, the protective glue can be used to protect the weak points of the box body 101, thereby further improving the electrolyte resistance of the box body 101.

[0100] In some embodiments, as shown in Figures 8 and 9, the battery pack 100 further includes a spacer structure 60 disposed between at least one column of battery cells 1021 and the base plate 10. This prevents the electrolyte from easily contacting the battery cells 1021 when the battery cells 1021 leak, further preventing the battery cells 1021 in adjacent columns from short-circuiting and forming a loop.

[0101] For example, as shown in FIG8 , the raised structure 60 can be located in the entire space between the battery cell module 102 and the base plate 10 . For another example, as shown in FIG9 , the raised structure 60 can include a first raised portion 601 and a second raised portion 602 , and the first raised portion 601 and the second raised portion 602 are spaced apart along the X-axis direction. Furthermore, the protective glue 70 can be continuously applied between the first raised portion 601 and the second raised portion 602 . For another example, the raised structure 60 can be provided in a circle, and the protective glue 70 can be continuously applied in the area surrounded by the raised structure 60 .

[0102] It should be noted that the height of the padding structure 60 (i.e., the dimension along the Z-axis direction) can be set based on the cooling requirements of the battery module 102 and the maximum leakage of a single battery cell. For example, the height of the padding structure 60 can be negatively correlated with the cooling requirements of the battery module 102, and the height of the padding structure 60 can be positively correlated with the maximum leakage of the single battery cell 1021. In addition, the padding structure 60 can also be made of a material with good thermal conductivity so that heat can be quickly dissipated to the base plate through the padding structure 60 to improve the heat dissipation capacity; the orthographic projection area of ​​the padding structure 60 and the protective glue 70 in the XY plane may also be determined based on the thermal conductivity coefficients of the two. For example, the orthographic projection area of ​​the one with a higher thermal conductivity coefficient in the XY plane can be set to be larger to improve the thermal conductivity.

[0103] The following describes the cooperation between the guide groove 40 and the liquid leakage detection device 30.

[0104] In some embodiments, the first core portion 3111, the second core portion 3121, and the isolation film 313 separating the first core portion 3111 from the second core portion 3121 all extend into the guide groove 40. For example, the detection portion in FIG4 extends into the guide groove 40.

[0105] In this embodiment, when a battery cell 1021 leaks, the electrolyte flows into the flow channel 40, preventing the electrolyte from short-circuiting two adjacent rows of battery cells 1021 and forming a loop, further reducing safety hazards. Furthermore, the leaked electrolyte is facilitated to contact the isolation membrane 313 within the flow channel 40, thereby rapidly dissolving the isolation membrane 313 and electrically connecting the first wire core 3111 and the second wire core 3121, providing a rapid and effective leakage detection effect.

[0106] Based on the above embodiment, the first core portion 3111, the second core portion 3121, and the separator 313 in the flow channel 40 extend in the column direction (i.e., the Y-axis direction). This arrangement allows the electrolyte to more easily flow into the flow channel 40 and contact the separator 313 when the battery cell 1021 leaks, thereby rapidly dissolving the separator 313 and electrically connecting the first core portion 3111 and the second core portion 3121, achieving rapid and effective leakage detection.

[0107] It should be noted that the battery pack 100 can be used in various scenarios, including home energy storage, industrial energy storage, data centers, and vehicles, to store and release electrical energy, including but not limited to the energy storage and power battery fields. The following describes the application scenarios of the energy storage system in conjunction with Figures 10 and 11.

[0108] FIG10 is a structural diagram of an energy storage device 1000 provided in an embodiment of the present application.

[0109] Referring to FIG10 , an embodiment of the present application further provides an energy storage device 1000 comprising multiple battery packs connected in series or in parallel, at least one of which is the battery pack 100 described in any of the preceding embodiments. FIG10 illustrates three battery packs connected in parallel via a first cable. It will be appreciated that, in an actual energy storage device 1000, there is no limit to the number of battery packs provided; that is, the number of battery packs can be set based on the actual energy storage requirements of the energy storage device 1000.

[0110] The energy storage device 1000 provided in the embodiment of the present application has the battery pack 100 in any of the previous embodiments, and therefore has at least the same beneficial effects as the battery pack 100 in any of the previous embodiments, which will not be described in detail here.

[0111] FIG11 is a structural diagram of an energy storage system 2000 provided in an embodiment of the present application.

[0112] Referring to FIG11 , an embodiment of the present application further provides an energy storage system 2000, which may include an inverter and an energy storage device 1000. The inverter is used to convert the DC power output by the energy storage device into AC power (i.e., it can output AC power from the AC power port), or to convert AC power (i.e., it can input AC power from the AC power port) into DC power for charging the energy storage device 1000.

[0113] Continuing with Figure 11 , the energy storage system 2000 may further include an energy storage cabinet 2001. Multiple battery packs and converters of the energy storage device 1000 may be placed in the energy storage cabinet 2001. Multiple battery packs may be connected in parallel via a first cable, and converters may be connected to each battery pack via a second cable. In Figure 10 , the door of the energy storage cabinet 2001 is not shown to illustrate the multiple battery packs and converters within the energy storage cabinet 2001.

[0114] For example, the energy storage system 2000 may also include a battery management system (not shown). The battery management system can effectively detect parameters such as the temperature, state of charge, and health status of the battery pack 100, and can also effectively regulate the charging and discharging functions of the energy storage device 1000, thereby ensuring the normal operation of the energy storage system 2000.

[0115] The energy storage system 2000 provided in the embodiment of the present application has the battery pack 100 in any of the previous embodiments, and therefore has at least the same beneficial effects as the battery pack 100 in any of the previous embodiments, which will not be described in detail here.

[0116] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A battery pack, characterized in that: Comprising: A box body; A plurality of battery cells, located within the box body; And, A leakage detection device, including a first wire, a second wire, an isolation film, a detection port, and an alarm; Wherein, the detection port includes a first conductive contact and a second conductive contact; the first wire is electrically connected to the first conductive contact; the second wire is electrically connected to the second conductive contact; both the first wire and the second wire extend into the box body, the part of the first wire extending into the box body includes an exposed first core part, and the part of the second wire extending into the box body includes an exposed second core part; the isolation film separates the first core part from the second core part, and the isolation film is configured to: dissolve when contacting the electrolyte, electrically connect the first core part and the second core part, and short - circuit the first conductive contact and the second conductive contact; The alarm is connected to the detection port, and the alarm is electrically connected to the first conductive contact and the second conductive contact. The alarm is used for: emitting an alarm signal when the first conductive contact and the second conductive contact are short - circuited.

2. The battery pack according to claim 1, wherein: The isolation film includes a first isolation sub - film, and the first isolation sub - film is located between the first core part and the second core part.

3. The battery pack according to claim 2, wherein The isolation film further includes a second isolation sub - film and a third isolation sub - film. The second isolation sub - film covers the side of the first core part facing away from the first isolation sub - film, and the third isolation sub - film covers the side of the second core part facing away from the first isolation sub - film.

4. The battery pack according to any one of claims 1 to 3, characterized in that, The box body includes a bottom plate, and the bottom plate includes a plurality of diversion grooves, and the openings of the diversion grooves face towards the inside of the box body; The first core part, the second core part, and the isolation film separating the first core part from the second core part all extend into the diversion grooves.

5. The battery pack according to claim 4, characterized in that: The plurality of battery cells are arranged in multiple columns on the bottom plate, and the multiple columns of battery cells are spaced apart along a first direction. The first direction is parallel to the bottom plate and perpendicular to the column direction of the plurality of battery cells; the diversion grooves are provided on one side or both sides of any column of battery cells along the first direction.

6. The battery pack according to claim 5, wherein, The diversion grooves extend along the column direction of any adjacent column of battery cells.

7. The battery pack according to claim 6, wherein, The first core part, the second core part, and the isolation film located in the diversion grooves all extend along the column direction.

8. The battery pack according to any one of claims 1 - 7, wherein, The dissolution duration of the isolation film is less than or equal to 72 hours.

9. The battery pack according to any one of claims 1 - 8, wherein, The material of the isolation film includes one or a combination of polyethylene, polytetrafluoroethylene, etc.

10. The battery pack according to any one of claims 1 - 9, wherein, The detection port is exposed outside the box body, and the alarm is connected to the detection port from the outside of the box body.

11. The battery pack according to any one of claims 1 to 10, characterized in that: It further includes a spare port, and the spare port includes the third conductive contact and the fourth conductive contact; The first conductive wire is also electrically connected to the third conductive contact; and the second conductive wire is also electrically connected to the fourth conductive contact.

12. An energy storage device, characterized in that, The energy storage device includes a plurality of battery packs connected in series or in parallel, and at least one of the plurality of battery packs is the battery pack according to any one of claims 1 to 11.

13. An energy storage system, characterized in that, include: An inverter and an energy storage device as claimed in claim 12; the inverter is used to convert the direct current output by the energy storage device into alternating current, or to convert alternating current into direct current and then charge the energy storage device.

Images