Marine battery pack and safety protection control system

Abstract

The application discloses a marine battery pack and a safety protection control system, and relates to the field of battery packs, which comprises a battery pack main body, a plurality of battery modules are fixedly installed in the battery pack main body, the battery pack main body has a gap between two adjacent battery modules, and a protection device is installed in the gap. The marine battery pack in the application integrates the safety protection structure on the protection device, the protection device is arranged in the gap between the two adjacent battery modules, and the protection device can move along the gap direction to reach each position of each battery module in the battery pack, thereby realizing the fixed-point protection of the battery pack. The structure can greatly reduce the safety protection pressure of the marine battery pack, and can reduce the amount of cooling medium carried by the battery pack.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery packs, in particular to a marine battery pack and a safety protection control system. BACKGROUND

[0002] It is known that battery packs, as an important energy storage solution, are developing rapidly. The progress of battery pack design and manufacturing technology directly affects the development of various fields, such as portable electronic devices, energy storage systems, and grid regulation, etc.

[0003] For example, the patent with the authorization announcement number CN114639882B and the authorization announcement date of 2024.04.16, and the name of a battery pack thermal runaway protection system, includes a linear temperature sensing fire detector, a battery management master control and a thermal aerosol fire extinguisher; the linear temperature sensing fire detector is laid on the surface of the battery module and penetrates the entire battery module, used for detecting the surface temperature of the battery module; the battery management master control is connected with the linear temperature sensing fire detector and the thermal aerosol fire extinguisher, used for preventing the battery module from thermal runaway……

[0004] As the same as the above-mentioned application, in the existing battery pack safety protection system or protection structure, since each battery pack is provided with a plurality of battery modules, especially the battery modules in the battery pack of large equipment machinery, such as ships and cars, are more, therefore, when protecting the safety of the battery pack, cooling medium spraying devices need to be installed at multiple positions in the battery pack, so the pipeline is more and more complex, and the internal space of the battery pack is seriously occupied, and in the existing battery pack structure, when one or more battery modules in the battery pack are abnormal, only a single spraying method can be used, and the whole battery pack is affected during spraying, which not only causes waste of cooling medium, but also easily affects the use of other battery modules. SUMMARY

[0005] (I) Invention purpose

[0006] Therefore, the purpose of the present application is to provide a marine battery pack and a safety protection control system, so as to realize the fixed-point protection of the battery pack, greatly reduce the safety protection pressure of the marine battery pack, and at the same time, reduce the amount of cooling medium carried by the battery pack.

[0007] (II) Technical scheme

[0008] In order to achieve the above technical purpose, the present application provides a marine battery pack, which comprises a battery pack body, a plurality of battery modules are fixedly installed in the battery pack body, the battery pack body has a gap between adjacent two battery modules, and a protection device is installed in the gap;

[0009] The protective device includes: a horizontal frame installed along the gap direction between the battery modules and a T-frame installed above the horizontal frame, wherein the horizontal part and the vertical part of the T-frame respectively cover the top and one side of the battery module, and the T-frame can slide along the length direction of the horizontal frame. Protective medium pipelines are installed below the horizontal part and outside the vertical part of the T-frame, and multiple groups of medium spraying components are equidistantly installed on the protective medium pipelines.

[0010] As a further description of the above technical solution: the protective medium pipeline includes an inner tube and an outer tube, wherein the inner tube is inserted into the interior of the outer tube;

[0011] The media spraying assembly includes a first media nozzle and a second media nozzle, wherein the first media nozzle and the second media nozzle are both fixedly mounted on the outer tube, and the first media nozzle is communicated with the interior of the outer tube, and the second media nozzle is communicated with the interior of the inner tube.

[0012] As a further description of the above technical solution: two groups of first medium pipe joints and two groups of second medium pipe joints are installed under one side of the T-frame, wherein the two groups of first medium pipe joints are respectively connected to the outer pipes on both sides of the T-frame, and the two groups of second medium pipe joints are connected to the inner pipes on both sides of the T-frame.

[0013] As a further description of the above technical solution: the protective device also includes a cooling medium storage tank, wherein the cooling medium storage tank is installed on the outside of the battery pack body, and a first medium storage tank for storing a first medium and a second medium storage tank for storing a second medium are provided inside the cooling medium storage tank, two groups of second medium pipe joints are connected to the second medium storage tank through a medium hose, and two groups of first medium pipe joints are connected to the first medium storage tank through a medium hose.

[0014] As a further description of the above technical solution: a slide is fixedly installed at the bottom of the T-frame, and the slide is slidably engaged on the cross frame. A slide groove is provided on the upper surface of the cross frame along the length direction, and a clamping part is installed at the bottom of the slide, and the clamping part is slidably assembled in the slide groove.

[0015] As a further description of the above technical solution: a servo motor is installed at one end of the horizontal frame, a screw is installed in the slide groove along the length direction, the output shaft of the servo motor is fixedly connected to one end of the horizontal frame, and a screw nut adapted to the screw is embedded in the engaging part, and the screw nut is screwed and sleeved with the screw.

[0016] As a further description of the above technical solution: the protective device also includes a temperature sensor and a controller, wherein a plurality of temperature sensors are provided, which are respectively installed in the corresponding positions of each battery module inside the battery pack body, and the controller is installed outside the battery pack body, the temperature sensor is electrically connected to the controller, and the controller is electrically connected to the first medium storage tank, the second medium storage tank and the servo motor.

[0017] The present invention also discloses a safety protection control system, which is applied to a marine battery pack and includes:

[0018] Data acquisition module, collecting temperature information of battery modules inside the marine battery pack;

[0019] The data processing module processes and analyzes the temperature information of the battery module to determine whether the battery module is abnormal. If abnormal, it marks it as an abnormal battery module, calculates the abnormal rate of the abnormal battery module, and compares the abnormal rate with the preset abnormal rate threshold to determine the abnormal level of the abnormal battery module;

[0020] The control module generates a first control instruction or a second control instruction according to the abnormality level of the abnormal battery module, and controls the protection device to perform a protection operation.

[0021] As a further description of the above technical solution: the method for determining whether the battery module is abnormal includes:

[0022] By time The temperature of the battery module is collected at the collection time interval, which is recorded as , set the abnormal temperature threshold to ;

[0023] The collected data is processed by the data processing module and For comparison, then:

[0024] when 、 、 Both greater than When the battery module is abnormal, 、 、 Respectively , No. , No. The temperature of the battery module collected at time intervals, , The value of is an integer greater than 1;

[0025] Methods for calculating the abnormality rate of abnormal battery modules include:

[0026] when = hour, ;

[0027] when > hour,

[0028] ;

[0029] when < hour,

[0030] ;

[0031] in, and are the temperature of the abnormal battery module and the temperature of the battery module adjacent to the abnormal battery module collected at the same time point, is the abnormal rate of abnormal battery modules, 、 、 Respectively , No. , No. The temperature of the abnormal battery module collected at the time interval, 、 、 Respectively , No. , No. The temperature of the battery module adjacent to the abnormal battery module is collected at time intervals. is the time interval, is the influence weight of the temperature of adjacent battery modules on the abnormal battery module temperature;

[0032] Methods for determining the abnormality level of an abnormal battery module include:

[0033] The preset abnormality rate threshold is , the collected data is processed by the data processing module and For comparison, then:

[0034] when ≤ When , the abnormality level is determined to be level one;

[0035] when > , the abnormality level is determined to be level 2.

[0036] As a further description of the above technical solution: the control module generates a first control instruction or a second control instruction according to the abnormal level of the abnormal battery module, and controls the protection device to perform a protection operation as follows:

[0037] When the abnormality level is level one, a first control instruction is generated to spray a first medium onto the abnormal battery module;

[0038] When the abnormality level is level two, a second control instruction is generated to spray a second medium onto the abnormal battery module.

[0039] In the above technical solution, the present invention provides a marine battery pack and safety protection control system. The marine battery pack integrates the safety protection structure into the protection device, and the protection device is provided in the gap between two adjacent rows of battery modules. The protection device can move along the direction of the gap, so as to reach various positions of each battery module inside the battery pack, thereby realizing fixed-point protection inside the battery pack. Such a structural setting greatly reduces the safety protection pressure of the marine battery pack and can also reduce the amount of cooling medium carried by the battery pack.

[0040] By designing two medium storage tanks and two medium spraying pipelines in the marine battery pack, the protective device can select the appropriate medium protection according to the internal state of the battery pack, thereby making the overall applicability of the device stronger. In addition, the two medium spraying pipelines in the marine battery pack share the same outer tube space, that is, the inner tube is inserted inside the outer tube, so the pipeline layout saves space, thereby reducing the internal space pressure of the battery pack;

[0041] The data acquisition module of the safety protection control system in the present invention can continuously collect the temperature of the battery modules inside the battery pack. When the temperature of a battery module exceeds the preset parameters, the battery module is determined to be an abnormal battery module. At this time, the data processing module can combine the temperatures of the battery modules adjacent to the abnormal battery module to calculate the abnormal rate of the abnormal battery module, and comprehensively judge the abnormal level of the abnormal battery module based on the abnormal rate. Finally, the control module can select a suitable cooling medium to cool the battery according to the actual abnormal level. This can greatly improve the overall service life of the battery pack (different cooling media have different effects on the internal structure of the battery pack. Generally, media that can cool faster will cause greater corrosion to the internal structure of the battery pack). Therefore, selecting a suitable cooling medium can effectively improve the service life of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0043] Figure 1A schematic diagram of the overall structure of a marine battery pack provided by the present invention;

[0044] Figure 2 A schematic diagram of the internal structure of a marine battery pack provided by the present invention;

[0045] Figure 3 A schematic structural diagram of a protective device for a marine battery pack provided by the present invention;

[0046] Figure 4 A marine battery pack provided by the present invention Figure 3 Schematic diagram of the enlarged structure of area A in the middle;

[0047] Figure 5 A schematic diagram of the T-frame structure of a marine battery pack provided by the present invention;

[0048] Figure 6 A schematic cross-sectional diagram of a medium pipeline in a marine battery pack provided by the present invention;

[0049] Figure 7 This is a system block diagram of a safety protection control system for a marine battery pack provided by the present invention.

[0050] Description of the drawings: 1. Battery pack main body; 10. Controller; 11. Cooling medium storage tank; 110. First medium storage tank; 111. Second medium storage tank; 12. Battery module; 13. Temperature sensor; 15. Protective device; 151. T-frame; 1510. First medium pipe joint; 1511. Second medium pipe joint; 152. Cross frame; 1520. Slide; 1521. Screw; 1522. Servo motor; 153. Medium pipeline; 1530. Inner tube; 1531. Outer tube; 1532. First medium nozzle; 1533. Second medium nozzle; 154. Slide; 1541. Engaging part. DETAILED DESCRIPTION

[0051] The following description is merely illustrative in nature and is not intended to limit the present disclosure, its applications, or uses. It should be understood that throughout the drawings, identical or similar reference numerals indicate identical or similar parts and features. The drawings merely schematically illustrate the concepts and principles of the embodiments of the present disclosure and do not necessarily depict the specific dimensions and proportions of the various embodiments of the present disclosure. Certain portions of certain drawings may be exaggerated to illustrate relevant details or structures of the embodiments of the present disclosure.

[0052] Example 1

[0053] Reference Figure 1-6: This embodiment provides a technical solution: a marine battery pack, including a battery pack body 1, in which multiple columns of battery modules 12 are fixedly installed. The battery pack body 1 is located between two adjacent columns of battery modules 12 with a gap, and a protective device 15 is installed in the gap. The protective device 15 includes: a horizontal frame 152 installed along the gap direction between the battery modules 12 and a T-frame 151 installed above the horizontal frame 152, wherein the horizontal portion and the vertical portion of the T-frame 151 respectively cover the top and one side of the battery module 12, and the T-frame 151 can slide along the length direction of the horizontal frame 152. Protective medium pipelines 153 are installed below the horizontal portion and outside the vertical portion of the T-frame 151, and multiple groups of medium spraying assemblies are equidistantly installed on the protective medium pipeline 153;

[0054] It should be noted that the marine battery pack integrates the safety protection structure into the protective device 15, and the protective device 15 is arranged in the gap between two adjacent columns of battery modules 12. The protective device 15 can move along the direction of the gap, so as to reach various positions of each battery module 12 inside the battery pack, thereby realizing fixed-point protection inside the battery pack. Such a structural setting greatly reduces the safety protection pressure of the marine battery pack (compared with the comprehensive spraying medium protection, it saves raw material costs), and at the same time, it can reduce the amount of cooling medium carried by the battery pack.

[0055] As a further description of the above technical solution: the protective medium pipeline 153 includes an inner tube 1530 and an outer tube 1531, wherein the inner tube 1530 is inserted into the interior of the outer tube 1531, and the medium spraying assembly includes a first medium nozzle 1532 and a second medium nozzle 1533, wherein the first medium nozzle 1532 and the second medium nozzle 1533 are both fixedly mounted on the outer tube 1531, and the first medium nozzle 1532 is connected to the interior of the outer tube 1531, and the second medium nozzle 1533 is connected to the interior of the inner tube 1530. It should be noted that the internal passages of the inner tube 1530 and the outer tube 1531 are independent of each other, so the cooling media in the inner tube 1530 and the outer tube 1531 will not interfere with each other.

[0056] Specifically, two groups of first medium pipe joints 1510 and two groups of second medium pipe joints 1511 are installed under one side of the T-frame 151, wherein the two groups of first medium pipe joints 1510 are respectively connected to the outer pipes 1531 on both sides of the T-frame 151, and the two groups of second medium pipe joints 1511 are connected to the inner pipes 1530 on both sides of the T-frame 151.

[0057] Specifically, the protective device 15 further includes a cooling medium storage tank 11, wherein the cooling medium storage tank 11 is installed outside the battery pack body 1. The cooling medium storage tank 11 is provided with a first medium storage tank 110 for storing a first medium and a second medium storage tank 111 for storing a second medium. Two sets of second medium pipe joints 1511 are connected to the second medium storage tank 111 via a medium hose, and two sets of first medium pipe joints 1510 are connected to the first medium storage tank 110 via a medium hose.

[0058] It should be noted that the first medium is a cooling medium, such as ammonia or Freon, and the second medium is a fire extinguishing medium, such as carbon dioxide or dry powder. By designing two medium storage tanks (a first medium storage tank 110 and a second medium storage tank 111) and two medium spraying pipelines (an inner tube 1530 and an outer tube 1531), the protective device 15 can select the appropriate medium protection according to the internal state of the battery pack, thereby enhancing the overall applicability of the device. In addition, the two medium spraying pipelines (the inner tube 1530 and the outer tube 1531) in the device share the space of the outer tube 1531, that is, the inner tube 1530 is inserted into the interior of the outer tube 1531. Therefore, the pipeline arrangement saves space, thereby reducing the pressure inside the battery pack.

[0059] When the battery pack is in use, when the temperature of the battery module 12 at a certain position inside the battery pack body 1 exceeds the set threshold, the cross frame 152 can be moved to the battery module 12 that exceeds the set temperature. Based on the temperature of the battery module 12, the protective device 15 selects the corresponding cooling medium for spraying. That is, when it is detected that the temperature of the battery module 12 is overheated but no open flame occurs, the first medium storage tank 110 is opened, and the first medium in the first medium storage tank 110 is sprayed out by the first medium nozzle 1532 through the corresponding medium spraying pipeline to cool the battery module 12 at this position. When it is detected that the temperature of the battery module 12 is overheated and an open flame occurs, the second medium storage tank 111 is opened, and the second medium in the second medium storage tank 111 is sprayed out by the second medium nozzle 1533 through the corresponding medium spraying pipeline to cool the battery module 12 at this position.

[0060] As a further description of the above technical solution: a slide 154 is fixedly installed at the bottom of the T-frame 151, and the slide 154 is slidably engaged on the cross frame 152. A slide groove 1520 is provided on the upper surface of the cross frame 152 along the length direction, and a snap-fitting part 1541 is installed at the bottom of the slide 154, and the snap-fitting part 1541 is slidably assembled in the slide groove 1520. Such a structural arrangement makes the slide 154 more stable when sliding, which can make the T-frame 151 more stable when moving.

[0061] Specifically, a servo motor 1522 is installed at one end of the horizontal frame 152, a lead screw 1521 is rotatably installed in the slide groove 1520 along the length direction, the output shaft of the servo motor 1522 is fixedly connected to one end of the horizontal frame 152, and a lead screw nut adapted to the lead screw 1521 is embedded in the engaging member 1541, and the lead screw nut is screwed and sleeved with the lead screw 1521;

[0062] It should be noted that: when the servo motor 1522 is running, it drives the screw 1521 to rotate. Under the cooperation of the screw nut, the engaging part 1541 slides in the slide groove 1520, thereby causing the T frame 151 to slide along the length direction of the cross frame 152 to achieve fixed-point protection.

[0063] As a further description of the above technical solution: the protective device 15 also includes a temperature sensor 13 and a controller 10, wherein there are multiple temperature sensors 13, which are respectively installed in the battery pack body 1 at the corresponding positions of each battery module 12, and the controller 10 is installed on the outside of the battery pack body 1. The temperature sensor 13 is electrically connected to the controller 10, and the controller 10 is electrically connected to the first medium storage tank 110, the second medium storage tank 111 and the servo motor 1522. The temperature sensor 13 can monitor the temperature information of each corresponding battery module 12 in real time and upload it to the controller 10.

[0064] Working principle: When the battery pack is in use, when the temperature of the battery module 12 at a certain position inside the battery pack body 1 exceeds the set threshold, the cross frame 152 can be moved to the battery module 12 that exceeds the set temperature, and then the cooling medium is fixed to the battery module 12 through the medium spraying assembly by the protective medium pipeline 153, thereby achieving the effect of fixed-point safety protection.

[0065] Example 2

[0066] Reference Figure 7 : This embodiment provides a safety protection control system, which is applied to a marine battery pack, including a data acquisition module to collect temperature information of battery modules inside the marine battery pack;

[0067] The data processing module processes and analyzes the temperature information of the battery module to determine whether the battery module is abnormal. If abnormal, it marks it as an abnormal battery module, calculates the abnormal rate of the abnormal battery module, and compares the abnormal rate with the preset abnormal rate threshold to determine the abnormal level of the abnormal battery module;

[0068] The control module generates a first control instruction or a second control instruction according to the abnormality level of the abnormal battery module, and controls the protection device to perform a protection operation.

[0069] Specifically, the method for determining whether the battery module is abnormal includes:

[0070] By time The temperature of the battery module is collected at the collection time interval, which is recorded as , set the abnormal temperature threshold to ;

[0071] The collected data is processed by the data processing module and For comparison, then:

[0072] when 、 、 Both greater than When the battery module is abnormal, 、 、 Respectively , No. , No. The temperature of the battery module collected at time intervals, , The value of is an integer greater than 1;

[0073] Methods for calculating the abnormality rate of abnormal battery modules include:

[0074] when = hour, ;

[0075] when > hour,

[0076] ;

[0077] when < hour,

[0078] ;

[0079] in, and are the temperature of the abnormal battery module and the temperature of the battery module adjacent to the abnormal battery module collected at the same time point, is the abnormal rate of abnormal battery modules, 、 、 Respectively , No. , No. The temperature of the abnormal battery module collected at the time interval, 、 、 Respectively , No. , No. The temperature of the battery module adjacent to the abnormal battery module is collected at time intervals. is the time interval, is the influence weight of the temperature of adjacent battery modules on the abnormal battery module temperature;

[0080] It should be noted that: The technical personnel in this field collect multiple sets of comprehensive parameters, set corresponding weight coefficients for each set of comprehensive parameters, substitute the set weight coefficients and the collected comprehensive parameters into the formula, screen the calculated weight coefficients and take the average value to obtain The value of .

[0081] Methods for determining the abnormality level of an abnormal battery module include:

[0082] The preset abnormality rate threshold is , the collected data is processed by the data processing module and For comparison, then:

[0083] when ≤ When , the abnormality level is determined to be level one;

[0084] when > , the abnormality level is determined to be level 2.

[0085] Specifically, the control module generates the first control instruction or the second control instruction according to the abnormality level of the abnormal battery module, and controls the protection device to perform the protection operation as follows:

[0086] When the abnormality level is level one, a first control instruction is generated to spray a first medium onto the abnormal battery module;

[0087] When the abnormality level is level two, a second control instruction is generated to spray a second medium onto the abnormal battery module.

[0088] Working principle: When the safety protection control system is used, the data acquisition module can The temperature of the battery modules inside the battery pack is continuously collected at intervals. When the temperature of a battery module exceeds the set threshold and continues When the temperature of the battery module exceeds the set temperature, it indicates that the battery module has been overheated for an abnormal period of time, and the battery module is determined to be an abnormal battery module. At this time, the data processing module can combine the temperatures of the battery modules adjacent to the abnormal battery module to calculate the abnormal rate of the abnormal battery module, and comprehensively judge the abnormal level of the abnormal battery module based on the abnormal rate. Finally, the control module can select a suitable cooling medium to cool the battery according to the actual abnormal level, which can greatly improve the overall service life of the battery pack (different cooling media have different effects on the internal structure of the battery pack. Generally, media that can cool faster will cause greater corrosion to the internal structure of the battery pack). Therefore, selecting a suitable cooling medium can effectively improve the service life of the battery pack.

[0089] The exemplary implementation schemes proposed in the present disclosure are described in detail above with reference to preferred embodiments. However, it will be understood by those skilled in the art that, without departing from the concept of the present disclosure, various modifications and variations can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present disclosure can be combined in various ways without exceeding the scope of protection of the present disclosure, which is determined by the appended claims.

Claims

1. A marine battery pack, comprising a battery pack body (1), wherein a plurality of rows of battery modules (12) are fixedly mounted in the battery pack body (1), characterized in that: The battery pack body (1) is located between two adjacent rows of battery modules (12) with a gap, and a protective device (15) is installed in the gap; The protective device (15) comprises: a horizontal frame (152) installed along the gap direction between the battery modules (12) and a T-frame (151) installed above the horizontal frame (152), wherein the horizontal portion and the vertical portion of the T-frame (151) respectively cover the top and one side of the battery module (12), and the T-frame (151) can slide along the length direction of the horizontal frame (152). A protective medium pipeline (153) is installed below the horizontal portion and outside the vertical portion of the T-frame (151), and a plurality of groups of medium spraying assemblies are equidistantly installed on the protective medium pipeline (153); The protective medium pipeline (153) comprises an inner tube (1530) and an outer tube (1531), wherein the inner tube (1530) is inserted into the interior of the outer tube (1531); The medium spraying assembly comprises a first medium nozzle (1532) and a second medium nozzle (1533), wherein the first medium nozzle (1532) and the second medium nozzle (1533) are both fixedly mounted on the outer tube (1531), and the first medium nozzle (1532) is in communication with the interior of the outer tube (1531), and the second medium nozzle (1533) is in communication with the interior of the inner tube (1530); Two sets of first medium pipe joints (1510) and two sets of second medium pipe joints (1511) are installed below one side of the T-frame (151), wherein the two sets of first medium pipe joints (1510) are respectively connected to the outer pipes (1531) on both sides of the T-frame (151), and the two sets of second medium pipe joints (1511) are connected to the inner pipes (1530) on both sides of the T-frame (151).

2. A marine battery pack according to claim 1, characterized in that: The protective device (15) further includes a cooling medium storage tank (11), wherein the cooling medium storage tank (11) is installed outside the battery pack body (1), and a first medium storage tank (110) for storing a first medium and a second medium storage tank (111) for storing a second medium are provided inside the cooling medium storage tank (11), two sets of second medium pipe joints (1511) are connected to the second medium storage tank (111) through a medium hose, and two sets of first medium pipe joints (1510) are connected to the first medium storage tank (110) through a medium hose.

3. A marine battery pack according to claim 2, characterized in that: A slide (154) is fixedly installed at the bottom of the T-frame (151), and the slide (154) is slidably engaged on the cross frame (152). A slide groove (1520) is provided on the upper surface of the cross frame (152) along the length direction. A locking member (1541) is installed at the bottom of the slide (154), and the locking member (1541) is slidably assembled in the slide groove (1520).

4. A marine battery pack according to claim 3, characterized in that: A servo motor (1522) is installed at one end of the cross frame (152), a lead screw (1521) is rotatably installed in the slide groove (1520) along the length direction, an output shaft of the servo motor (1522) is fixedly connected to one end of the cross frame (152), a lead screw nut adapted to the lead screw (1521) is embedded in the engaging member (1541), and the lead screw nut is screwed and sleeved with the lead screw (1521).

5. A marine battery pack according to claim 4, characterized in that: The protective device (15) further includes a temperature sensor (13) and a controller (10), wherein a plurality of the temperature sensors (13) are provided and are installed inside the battery pack body (1) at corresponding positions of each battery module (12); the controller (10) is installed outside the battery pack body (1); the temperature sensor (13) is electrically connected to the controller (10); and the controller (10) is electrically connected to the first medium storage tank (110), the second medium storage tank (111) and the servo motor (1522).

6. A safety protection control system, applied to the marine battery pack according to claim 5, characterized in that: include: Data acquisition module, collecting temperature information of battery modules inside the marine battery pack; The data processing module processes and analyzes the temperature information of the battery module to determine whether the battery module is abnormal. If abnormal, it marks it as an abnormal battery module, calculates the abnormal rate of the abnormal battery module, and compares the abnormal rate with the preset abnormal rate threshold to determine the abnormal level of the abnormal battery module; The control module generates a first control instruction or a second control instruction according to the abnormality level of the abnormal battery module, and controls the protection device to perform a protection operation.

7. A safety protection control system according to claim 6, characterized in that: The method for determining whether a battery module is abnormal includes: By time The temperature of the battery module is collected at the collection time interval, which is recorded as , set the abnormal temperature threshold to ; The collected data is processed by the data processing module and For comparison, then: when 、 、 Both greater than When the battery module is abnormal, 、 、 Respectively , No. , No. The temperature of the battery module collected at time intervals, , The value of is an integer greater than 1; Methods for calculating the abnormality rate of abnormal battery modules include: when = hour, ; when > hour, ； when < hour, ； in, and are the temperature of the abnormal battery module and the temperature of the battery module adjacent to the abnormal battery module collected at the same time point, is the abnormal rate of abnormal battery modules, 、 、 Respectively , No. , No. The temperature of the abnormal battery module collected at the time interval, 、 、 Respectively , No. , No. The temperature of the battery module adjacent to the abnormal battery module is collected at time intervals. is the time interval, is the influence weight of the temperature of adjacent battery modules on the abnormal battery module temperature; Methods for determining the abnormality level of an abnormal battery module include: The preset abnormality rate threshold is , the collected data is processed by the data processing module and For comparison, then: when ≤ When , the abnormality level is determined to be level one; when > , the abnormality level is determined to be level 2.

8. A safety protection control system according to claim 7, characterized in that: The control module generates a first control instruction or a second control instruction according to the abnormal level of the abnormal battery module, and controls the protection device to perform a protection operation as follows: When the abnormality level is level one, a first control instruction is generated to spray a first medium onto the abnormal battery module; When the abnormality level is level two, a second control instruction is generated to spray a second medium onto the abnormal battery module.

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