Detachable maintenance type battery pack, maintenance method and vehicle

Abstract

The invention provides a detachable maintenance type battery pack, a maintenance method and a vehicle, the detachable maintenance type battery pack comprises a battery cell group and a lower box body assembly, and the lower box body assembly comprises a detachable bonding structure and a liquid cooling plate; the detachable bonding structure comprises a glue layer, a temperature-sensitive coating, a dispergator runner and a glue blocking piece, the dispergator runner is arranged on one surface, facing the battery cell group, of the liquid cooling plate, the glue blocking piece is arranged at the side part of the dispergator runner, the temperature-sensitive coating is arranged on one surface, facing the battery cell group, of the liquid cooling plate, and the temperature-sensitive coating is connected with the battery cell group through the glue layer. According to the detachable maintenance type battery pack, the detachable bonding structure and the structural design improvement of the liquid cooling plate are utilized, so that the problems that the battery pack is inconvenient to maintain, the electric core level is difficult to disassemble, and other parts such as a box body cannot be reused are solved in design, the electric core group level and the electric core level of the battery pack can be efficiently and losslessly disassembled, and the battery pack can be conveniently and rapidly disassembled. The efficiency of disassembling the battery pack is improved, and damage to other parts in the battery pack is reduced.

Description

Technical Field

[0001] The present application relates to the field of power battery technology, and in particular to a detachable and maintainable battery pack, a maintenance method, and a vehicle. Background Art

[0002] With the increasing popularity of electric vehicles and intensified market competition, consumers' expectations for the reliability, durability and cost-effectiveness of power batteries are constantly increasing, thereby driving the demand for high cost-effectiveness and improved maintainability of power batteries.

[0003] The current mainstream battery pack uses a CTP (Cell To Pack) structure that uses thermally conductive adhesive to bond the cell group to the bottom of the box to achieve structural simplification and improve assembly efficiency. If the battery pack is abused by a vehicle collision, dragging, scraping, or puncturing the bottom, the battery pack and cells will be damaged, or the consistency of individual cells will deteriorate, resulting in limited use of the battery pack. In this case, maintenance is extremely difficult and almost impossible to repair, and the entire battery pack must be replaced. This situation has the potential to cause huge losses to consumers, car manufacturers, and insurance companies, increase consumers' concerns about purchasing new energy electric vehicles, and hinder the healthy development of the industry.

[0004] Therefore, it is necessary to design a detachable and maintainable battery pack to solve the above problems. Summary of the Invention

[0005] In view of this, in order to overcome the defects of the prior art, the present invention provides a detachable and maintainable battery pack, a maintenance method and a vehicle, which effectively solves the problem that the use of the battery pack is limited due to the inability to disassemble the existing battery pack. In this case, maintenance is very difficult and almost impossible to repair, and the entire battery pack can only be replaced.

[0006] According to a first aspect of the present invention, a detachable and maintainable battery pack is provided, comprising a cell group and a lower box assembly, wherein the lower box assembly comprises a detachable adhesive structure and a liquid cooling plate, and the liquid cooling plate is connected to the cell group via the detachable adhesive structure; the detachable adhesive structure comprises an adhesive layer, a temperature-sensitive coating, a disintegrant flow channel and a glue stopper, the disintegrant flow channel is arranged on a side of the liquid cooling plate facing the cell group, the glue stopper is arranged on a side of the disintegrant flow channel, the temperature-sensitive coating is provided on a side of the liquid cooling plate facing the cell group, and the temperature-sensitive coating is connected to the cell group via the adhesive layer.

[0007] Preferably, the liquid cooling plate is bent to form a coolant flow channel and the glue dissolving agent flow channel, the glue dissolving agent flow channel is arranged on both sides of the coolant flow channel, and the glue blocking member is arranged on the top of the glue dissolving agent flow channel to isolate the glue layer.

[0008] Preferably, the adhesive blocking member covers the adhesive dissolving agent flow channel, and the liquid cooling plate is provided with an adhesive dissolving agent injection port communicating with the adhesive dissolving agent flow channel.

[0009] Preferably, two adjacent glue blocking members are arranged on a side of the liquid cooling plate facing the battery cell group, and the disintegrator flow channel is formed between the two adjacent glue blocking members.

[0010] Preferably, the thickness of the adhesive blocking member corresponds to the thickness of the adhesive layer, and both ends of the adhesive dissolving agent flow channel are formed as adhesive dissolving agent injection ports.

[0011] Preferably, the lower box assembly also includes a lower box body and a box longitudinal beam, and the number of the box longitudinal beams is multiple, and the multiple box longitudinal beams are arranged at intervals on the lower box body along the first direction. The lower box body is divided into multiple installation areas by the multiple box longitudinal beams, each of the installation areas corresponds to a battery cell group, and the disintegrator flow channel is provided at both ends of each installation area.

[0012] Preferably, the lower box assembly further includes an expansion beam structure, and the expansion beam structure is provided at one end of the box longitudinal beam.

[0013] Preferably, the expansion beam structure includes a detachable beam, a support member and a filling member, the detachable beam is detachably connected to the lower box body, the support member is arranged at both ends of the detachable beam, and the filling member is arranged between the detachable beam and the battery cell group.

[0014] According to a second aspect of the present invention, a maintenance method is provided, wherein the maintenance method is used to repair the detachable maintainable battery pack as described above; the maintenance method includes removing the connector of the lower box assembly; passing water with a temperature greater than 50 degrees Celsius into the liquid cooling plate to separate the temperature-sensitive coating from the adhesive layer; passing a degumming agent into the degumming agent flow channel, the degumming agent contacts the adhesive blocking member, and then dissolves the adhesive blocking member; continuously passing the degumming agent, after the adhesive blocking member is dissolved, the degumming agent contacts the adhesive layer, and the adhesive layer begins to dissolve; after soaking for a period of time, disassembling the battery cell groups that need to be repaired and replaced one by one; tightening the connector; re-pasting the adhesive blocking member to the battery cell group and coating the adhesive layer, and stacking the battery cells and putting them into the box.

[0015] According to a third aspect of the present invention, a vehicle is provided, wherein the vehicle includes the detachable and maintainable battery pack as described above.

[0016] The detachable and maintainable battery pack according to the present invention utilizes a detachable adhesive structure and an improved structural design of a liquid cooling plate, thereby solving the problems of inconvenient maintenance of CTP-type battery packs, difficulty in disassembling the cell level, and non-reusability of other components such as the box. By adding a temperature-sensitive coating between the liquid cooling plate and the adhesive layer, the bonding and cooling performance of the battery pack is ensured while achieving efficient and non-destructive disassembly of the battery pack at the cell group level. By cooperating with the adhesive dismantling agent flow channel and the adhesive retaining member provided on the liquid cooling plate, the single battery module area or single cell can be replaced and repaired according to maintenance needs, thereby achieving cell-level disassembly. This avoids damage to the battery pack caused by the destructive disassembly method of using tooling to apply pressure or using the pulling force of a raker to push the cell block out of the box frame and then disassembling the cell block into several cells. This also improves the efficiency of battery pack disassembly and reduces damage to other components in the battery pack.

[0017] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A first structural schematic diagram of the lower box assembly according to an embodiment of the present invention is shown;

[0020] Figure 2 A second structural schematic diagram of the lower box assembly according to an embodiment of the present invention is shown;

[0021] Figure 3 A top view of a lower box assembly according to an embodiment of the present invention is shown;

[0022] Figure 4 The embodiment according to the present invention is shown Figure 3 A magnified schematic diagram of the structure at A in the middle;

[0023] Figure 5 A schematic structural diagram showing the connection between a cell group and a lower box assembly according to an embodiment of the present invention is shown.

[0024] Figure numerals: 1-battery cell group; 2-lower box assembly; 201-lower box body; 202-box longitudinal beam; 203-detachable crossbeam; 204-support member; 205-filling member; 3-liquid cooling plate; 301-cooling liquid flow channel; 4-glue layer; 5-temperature sensitive coating; 6-glue dissolving agent flow channel; 7-glue blocking member. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0026] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or are the orientation or positional relationship in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0027] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0028] In the description of the embodiments of the present application, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0029] According to a first aspect of the present invention, a detachable and maintainable battery pack is provided. Figures 1 to 5 As shown, the detachable and maintainable battery pack can be used in electric vehicles. Compared with the battery pack that cannot be disassembled in the prior art, the detachable and maintainable battery pack can improve the maintenance convenience of the CTP type battery pack, and can realize the functions of disassembly and maintenance at the cell level and the secondary use of components such as the box. The detachable and maintainable battery pack includes a cell group 1 and a lower box assembly 2. In the following description, reference will be made to Figures 1 to 5 The detailed structures of the cell group 1 and the lower box assembly 2 of the detachable and maintainable battery pack are described in detail.

[0030] like Figure 5 As shown, in the embodiment, the battery cell group 1 can be composed of multiple battery cells connected together, and the battery cells are common CTP-type battery cells. Their specific structure and connection method with the lower box assembly 2 are known to those skilled in the art, so they are not described in detail. The present application scheme has made special design improvements to the lower box assembly 2, so that the battery cell group 1 and the lower box assembly 2 are detachably connected, thereby allowing the battery pack to be disassembled and repaired as a whole at the battery cell group 1 level, and can also be disassembled and repaired in a regional manner at the battery cell level.

[0031] like Figures 1 to 4 As shown, in this embodiment, the lower case assembly 2 includes a detachable adhesive structure and a liquid cooling plate 3, which is connected to the battery cell group 1 via the detachable adhesive structure. The detachable adhesive structure includes an adhesive layer 4, a temperature-sensitive coating 5, a disintegrant flow channel 6, and a glue stopper 7. The disintegrant flow channel 6 is provided on the side of the liquid cooling plate 3 facing the battery cell group 1, and the glue stopper 7 is provided on the side of the disintegrant flow channel 6. The temperature-sensitive coating 5 is provided on the side of the liquid cooling plate 3 facing the battery cell group 1, and the temperature-sensitive coating 5 is connected to the battery cell group 1 via the adhesive layer 4.

[0032] Specifically, the adhesive layer 4 can be, for example, a heat-conducting structural adhesive in the prior art. The detachable adhesive structure adds a layer of temperature-sensitive coating 5 between the liquid cooling plate 3 and the adhesive layer 4. When the battery pack needs to be disassembled, hot water above 50 degrees Celsius is passed into the liquid cooling plate 3. The temperature-sensitive coating 5 can be a material with temperature-sensitive characteristics and thermal conductivity in the prior art, which can be known to those skilled in the art. Since the temperature-sensitive coating 5 is temperature-sensitive and has thermal conductivity, the surface adhesion between the temperature-sensitive coating 5 and the adhesive layer 4 is reduced after contact with high temperature, and the interface between the temperature-sensitive coating 5 and the adhesive layer 4 is detached, so that the battery cell group 1 can be separated from the liquid cooling plate 3 at the bottom. After separation, maintenance personnel can inspect the battery cell group 1 as needed, and then re-glue can be applied to continue bonding. Other areas that do not need to be replaced will not affect the bonding strength after waiting for the temperature to drop. For example Figure 1 and Figure 2As shown, the temperature-sensitive coating 5 is applied to the surface of the liquid cooling plate 3, covering the battery pack 1, and has a thickness greater than 0.05 mm. Leveraging the properties of the temperature-sensitive coating 5, the battery pack 1 can be disassembled non-destructively. This disassembly, starting from the battery pack 1 level, also enables secondary recycling of the battery case.

[0033] Furthermore, the glue stopper 7 is arranged on the side of the glue dissolving agent flow channel 6. The side here can be understood as: the glue stopper 7 needs to isolate the glue dissolving agent flow channel 6 from the glue layer 4 to prevent the glue in the glue layer 4 from flowing into the inside of the glue dissolving agent flow channel 6. The glue dissolving agent flow channel 6 is used for the circulation of the glue dissolving agent. In the case where the battery pack needs to be disassembled, the glue dissolving agent is filled into the glue dissolving agent flow channel 6. The glue dissolving agent will first dissolve the glue stopper 7. After the glue stopper 7 is dissolved, the glue dissolving agent will fully contact the glue layer 4, and then soak the bottom of the entire battery cell group 1, dissolving the glue layer 4 from the inside, and realizing the disassembly of the battery cell. In addition, the glue dissolving agent can also be a material in the prior art, specifically a mixture of an organic solvent, a moisture inhibitor and a penetrant, which is a special glue dissolving and cleaning agent for removing cured acrylic adhesives, etc. It is applicable to the glue dissolving and surface cleaning of acrylic cured adhesives such as UV glue and polyurethane glue. It is not corrosive to metals. The glue dissolving agent on the metal surface can be wiped off without affecting the subsequent gluing. After the battery cell group 1 is disassembled as a whole, the battery cells that need to be repaired can be replaced individually using the disintegrator flow channel 6 .

[0034] Furthermore, the adhesive stopper 7 can be, for example, an adhesive stopper strip commonly used in the prior art. The adhesive stopper strip is made of PC (polycarbonate) or ABS plastic, which can be dissolved by an adhesive dissolving agent and can serve as a limit strip for the adhesive layer 4 .

[0035] In this way, the detachable and maintainable battery pack utilizes a detachable adhesive structure and an improved structural design of the liquid cooling plate 3, solving the problems of inconvenient maintenance of CTP-type battery packs, difficulty in disassembling the battery cell level, and non-reusability of other components such as the box. By adding a temperature-sensitive coating 5 between the liquid cooling plate 3 and the adhesive layer 4, the bonding and cooling performance of the battery pack is guaranteed while achieving efficient and non-destructive disassembly of the battery cell group 1 level of the battery pack. Through the cooperation of the disassembly agent flow channel 6 and the adhesive retaining member 7 provided on the liquid cooling plate 3, the single battery module area or single battery cell can be replaced and repaired according to maintenance needs, thereby achieving battery cell-level disassembly, avoiding the damage to the battery pack caused by the destructive disassembly method of using tooling to apply pressure or using the pulling force of the edger to push the battery cell block out of the box frame and then disassembling the battery cell block into several batteries. At the same time, the efficiency of battery pack disassembly is improved and damage to other components in the battery pack is reduced.

[0036] Preferably, in an embodiment, Figure 1 and Figure 2As shown, there are two examples of detachable bonding structures. Figure 1 and Figure 2 Describe them separately.

[0037] like Figure 1 As shown, in the first embodiment, the liquid cooling plate 3 is bent to form a coolant flow channel 301 and a disintegrator flow channel 6. The disintegrator flow channel 6 is arranged on both sides of the coolant flow channel 301. Alternatively, the disintegrator flow channel 6 and the coolant flow channel 301 can be arranged at intervals as needed. In addition, the arrangement position of the coolant flow channel 301 is preferably the gap position between the length direction of each column of battery cells, and setting it here does not affect the overall cooling performance of the battery. The glue stopper 7 is arranged on the top of the disintegrator flow channel 6 to isolate the glue layer 4. The glue stopper 7 can also serve as a limiter to limit the glue layer 4.

[0038] Preferably, if Figure 1 As shown in the first embodiment, the glue blocking member 7 covers the disintegrator flow channel 6. The covering here can be understood as Figure 1 In the vertical projection shown, the rubber stopper 7 is Figure 1 The length in the left and right directions is greater than that in the disintegrator flow channel 6. Figure 1 The length in the left and right directions is to prevent the glue layer 4 from flowing into the glue dissolving agent flow channel 6. In order to facilitate the injection of the glue dissolving agent, the liquid cooling plate 3 is provided with a glue dissolving agent injection port (not shown) connected to the glue dissolving agent flow channel 6. The glue dissolving agent injection port can be set on one side of the coolant inlet to facilitate the user to inject the glue dissolving agent. In the case where the battery pack needs to be disassembled, the glue dissolving agent is injected through the glue dissolving agent injection port, and the glue dissolving agent is continued to be introduced after the glue blocking member 7 is dissolved. The glue dissolving agent contacts the glue layer 4 and dissolves the glue layer 4, thereby realizing the disassembly of the battery pack.

[0039] like Figure 2 As shown, in the second embodiment, two adjacent glue blocking members 7 are provided on the side of the liquid cooling plate 3 facing the battery cell group 1, and a disintegrant flow channel 6 is formed between the two adjacent glue blocking members 7. The disintegrant flow channel 6 in the second embodiment is formed by combining the two adjacent glue blocking members 7.

[0040] Preferably, if Figure 2 As shown in the second embodiment, both ends of the disintegrating agent flow channel 6 are formed as disintegrating agent injection ports. It can be understood that since the disintegrating agent flow channel 6 is formed by two adhesive blocking members 7, in order to facilitate the injection of the disintegrating agent, both ends of the two adhesive blocking members 7 are formed as disintegrating agent injection ports, see Figure 3 , the rubber stopper 7 is Figure 3Both ends in the upper and lower directions can be used as disintegrator injection ports or disintegrator outflow ports, so that the disintegrator can fully contact the glue stopper 7 or the glue layer 4. In order to facilitate assembly and bonding, the thickness of the glue stopper 7 needs to correspond to the thickness of the glue layer 4. In the case of needing to disassemble the battery pack, the user can use tooling to inject the disintegrator into the disintegrator flow channel 6 through the disintegrator injection port. The disintegrator flows into the disintegrator injection port on one side and fills the flow channel. It contacts the glue stopper 7 and dissolves the glue stopper 7. The disintegrator is continuously injected. After the glue stopper 7 is dissolved, the disintegrator fully contacts the glue layer 4, and then soaks the bottom of the entire battery cell group 1, dissolving the glue layer 4 from the inside, and realizing the individual disassembly of the battery cells.

[0041] In addition, in order to achieve better and faster disassembly of the battery pack 1 and to facilitate maintenance personnel to perform separate repairs on specific areas, the present application also improves the structure of the lower box. Figures 3 to 5 In the embodiment, the lower box assembly 2 may further include a lower box body 201 and a box longitudinal beam 202. The number of the box longitudinal beams 202 is multiple, and the multiple box longitudinal beams 202 are spaced apart on the lower box body 201 along the first direction S1. The first direction S1 can be understood as Figure 3 In the direction from left to right in the middle. In this way, the lower box body 201 can be divided into multiple installation areas by multiple box longitudinal beams 202, each installation area corresponds to a battery cell group 1, and both ends of each installation area are provided with a degumming agent flow channel 6. Here, the two ends of each installation area can be understood as the two ends in the first direction S1. In this way, the user can choose to replace the battery cell group 1 in different installation areas according to maintenance needs. During disassembly, hot water is passed into the liquid cooling plate 3 to realize the disassembly of the entire battery cell group 1 in the sealed area. After that, it is only necessary to inject degumming agent into the degumming agent flow channel 6 of the area to be repaired. The degumming agent flows in from the degumming agent injection port on one side and fills the flow channel, dissolving the glue blocking part 7, and then soaking the bottom of the entire battery cell group 1, dissolving the glue layer 4 from the inside, and realizing the disassembly of the battery cell. After the temperature of the liquid cooling plate 3 is lowered, it does not affect the bonding strength between the battery cell group 1 and the liquid cooling plate 3. The temperature-sensitive coating 5 is applied to the installation area of ​​the battery cell group 1 to be maintained, the glue blocking part 7 is attached, and the thermal conductive structural glue is applied. The battery cells are stacked into the box to complete the maintenance. The temperature-sensitive coating 5 cooperates with the debonding agent to disassemble the battery pack, thereby realizing the disassembly of the battery pack at the cell level. At the same time, it can greatly reduce the time cost of the debonding agent soaking the bottom of the battery cell when disassembling the battery pack alone, or the temperature-sensitive coating 5 can only disassemble the battery pack at the cell group 1 level when disassembling the battery pack alone, thereby improving the flexibility and convenience of maintenance.

[0042] Preferably, if Figure 3 and Figure 4 As shown, in the embodiment, in order to release the stress in the length direction of the battery pack 1 during the disassembly of the battery pack (the length direction here can be understood as Figure 3In the vertical direction, the lower box assembly 2 further includes an expansion beam structure, which is provided at one end of the box longitudinal beam 202. The expansion beam structure can release the stress in the longitudinal direction when the battery pack is disassembled, and can also provide support for the installation of the battery cell group 1.

[0043] Preferably, if Figure 3 and Figure 4 As shown, in an embodiment, the expansion beam structure may include a detachable beam 203, a support member 204, and a filler 205. The detachable beam 203 is detachably connected to the lower box body 201 to release stress in the length direction. The support members 204 are provided at both ends of the detachable beam 203 to provide support force. The filler 205 is provided between the detachable beam 203 and the battery cell group 1 to dynamically fill the gap between the detachable beam 203 and the battery cell group 1. Specifically, the detachable beam 203 is detachably connected to the lower box body 201 by bolts. Figure 4 The circular hole on the removable crossbeam 203 is the installation point of the bolt. Since the removable crossbeam 203 can be movably disassembled, the stress in the length direction can be released. The support member 204 is formed into a triangular support structure, which is welded to the lower box body 201. The triangular support structure plays a role in supporting the strength of the removable crossbeam 203. The filler 205 can be, for example, the vacuum expansion foam in the prior art. The adhesive backing of the vacuum expansion foam is pasted between the removable crossbeam 203 and the battery cell group 1. The gap between the dynamic removable crossbeam 203 and the battery cell group 1 has a large thickness range after being punctured, which can make up for the gap tolerance between the battery cell group 1 and the removable crossbeam 203. During disassembly, the removable crossbeam 203 is disassembled by bolts. After the removable crossbeam 203 is disassembled, the expansion force inside the battery cell group 1 is released, thereby realizing the disassembly of the battery cell group 1 of the battery pack.

[0044] This detachable and maintainable battery pack utilizes a detachable adhesive structure and an improved liquid cooling plate structure. This design addresses the issues of CTP battery packs, such as the inconvenient maintenance, difficult cell-level disassembly, and the non-reusability of other components such as the box. By adding a temperature-sensitive coating between the liquid cooling plate and the adhesive layer, the battery pack's bonding and cooling performance are maintained while enabling efficient and non-destructive disassembly at the cell level. The adhesive dismantling channel and adhesive retaining member provided on the liquid cooling plate allow for replacement and repair of individual battery module areas or cells based on maintenance needs, thereby achieving cell-level disassembly. This avoids the destructive disassembly methods of using tooling to apply pressure or a ripping machine to push the cell block out of the box frame and then disassemble it into several cells, which can damage the battery pack. This also improves the efficiency of battery pack disassembly and reduces damage to other components within the battery pack.

[0045] In addition, according to a second aspect of the present invention, a maintenance method is provided for repairing the above-mentioned detachable and maintainable battery pack, the maintenance method comprising:

[0046] The first step is to remove the connecting parts of the lower box assembly 2. Specifically, the connecting bolts between the detachable crossbeam 203 and the lower box body 201 can be removed.

[0047] In the second step, hot water with a temperature greater than 50 degrees Celsius is introduced into the liquid cooling plate 3 to separate the temperature-sensitive coating 5 from the adhesive layer 4;

[0048] The third step is to introduce the disintegrator into the disintegrator flow channel 6. The disintegrator can be injected through the disintegrator injection port and allowed to contact the adhesive blocking member 7 to dissolve the adhesive blocking member 7.

[0049] Step 4: Continue to introduce the disintegrating agent. After the adhesive stopper 7 dissolves, the disintegrating agent contacts the adhesive layer 4, and the adhesive layer 4 begins to dissolve.

[0050] Step 5: After soaking for a period of time, disassemble the battery packs 1 that need to be repaired and replaced one by one;

[0051] Step 6: After the repair and replacement is completed, tighten the connecting parts, that is, tighten the connecting bolts between the detachable crossbeam 203 and the lower box body 201;

[0052] In the seventh step, the adhesive blocking member 7 is re-adhered to the battery cell group 1 and the adhesive layer 4 is applied. The battery cells are stacked and placed in a box to complete the maintenance of the battery pack.

[0053] Because this repair method utilizes the aforementioned disassembled and maintainable battery pack, it allows for lossless replacement of both the cell group 1 and the cells. The components within the battery pack are reusable, resolving the issue of high-strength thermally conductive structural adhesives causing damage to the cells and structural components during battery pack disassembly. The added temperature-sensitive coating 5 allows for the individual removal of the cell group 1, without affecting the adhesive properties after cooling. This significantly improves the efficiency of battery pack disassembly and minimizes damage to other components within the pack.

[0054] In addition, according to a third aspect of the present invention, a vehicle is provided, comprising the detachable and maintainable battery pack as described above.

[0055] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. These modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims.

Claims

1. A detachable and maintainable battery pack, comprising a cell group and a lower box assembly, characterized in that: The lower box assembly includes a detachable adhesive structure and a liquid cooling plate, and the liquid cooling plate is connected to the battery cell group through the detachable adhesive structure; the detachable adhesive structure includes an adhesive layer, a temperature-sensitive coating, a disintegrant flow channel and a glue stopper, the disintegrant flow channel is arranged on the side of the liquid cooling plate facing the battery cell group, the glue stopper is arranged on the side of the disintegrant flow channel, the temperature-sensitive coating is provided on the side of the liquid cooling plate facing the battery cell group, and the temperature-sensitive coating is connected to the battery cell group through the adhesive layer.

2. The detachable and maintainable battery pack according to claim 1, characterized in that: The liquid cooling plate is bent to form a coolant flow channel and the debonding agent flow channel. The debonding agent flow channel is arranged on both sides of the coolant flow channel. The glue blocking member is arranged on the top of the debonding agent flow channel to isolate the glue layer.

3. The detachable and maintainable battery pack according to claim 2, characterized in that: The adhesive blocking member covers the adhesive dissolving agent flow channel, and the liquid cooling plate is provided with an adhesive dissolving agent injection port communicated with the adhesive dissolving agent flow channel.

4. The detachable and maintainable battery pack according to claim 1, characterized in that: Two adjacent glue blocking members are arranged on a side of the liquid cooling plate facing the battery cell group, and a disintegrating agent flow channel is formed between the two adjacent glue blocking members.

5. The detachable and maintainable battery pack according to claim 4, characterized in that: The thickness of the adhesive blocking member corresponds to the thickness of the adhesive layer, and both ends of the adhesive dissolving agent flow channel are formed as adhesive dissolving agent injection ports.

6. The detachable and maintainable battery pack according to claim 1, characterized in that: The lower box assembly also includes a lower box body and a box longitudinal beam. There are multiple box longitudinal beams, and the multiple box longitudinal beams are arranged on the lower box body at intervals along the first direction. The lower box body is divided into multiple installation areas by the multiple box longitudinal beams, each of the installation areas corresponds to a battery cell group, and the disintegrator flow channel is provided at both ends of each installation area.

7. The detachable and maintainable battery pack according to claim 6, characterized in that: The lower box assembly further includes an expansion beam structure, which is arranged at one end of the box longitudinal beam.

8. The detachable and maintainable battery pack according to claim 7, characterized in that: The expansion beam structure includes a detachable beam, a support member and a filling member. The detachable beam is detachably connected to the lower box body. The support member is arranged at both ends of the detachable beam. The filling member is arranged between the detachable beam and the battery cell group.

9. A maintenance method, characterized in that: The maintenance method is used to repair the detachable and maintainable battery pack according to any one of claims 1 to 8; The maintenance method comprises: Remove the connectors of the lower box assembly; Passing water with a temperature greater than 50 degrees Celsius into the liquid cooling plate to separate the temperature-sensitive coating from the adhesive layer; A disintegrator is introduced into the disintegrator flow channel, the disintegrator contacts the adhesive blocking member, and then dissolves the adhesive blocking member; The disintegrator is continuously introduced, and after the adhesive blocking member is dissolved, the disintegrator contacts the adhesive layer, and the adhesive layer begins to dissolve; After soaking for a period of time, disassemble the battery packs that need to be repaired and replaced one by one; Fasten the connectors; The adhesive blocking piece is re-adhered to the battery cell group and the adhesive layer is applied, and the battery cells are stacked and then placed in a box.

10. A vehicle, characterized in that: The vehicle includes the detachable and maintainable battery pack according to any one of claims 1 to 8.

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