Liquid cooling box and battery pack with same

Abstract

The utility model is applicable to the technical field of liquid cooling, and provides a liquid cooling box and a battery pack with the liquid cooling box, the liquid cooling box comprises a box body and a telescopic component, an accommodating space is formed in the box body, the telescopic component is arranged in the accommodating space, and a plurality of movable battery cells of a battery module can be movably mounted in the accommodating space in sequence along a first direction. Each battery module is connected with at least one telescopic assembly; the telescopic assembly at least comprises a plurality of telescopic units which are arranged along a first direction and can be connected with each movable battery cell in a one-to-one correspondence manner; the telescopic unit is configured to expand along with the expansion movement of the movable battery cell so as to extend along a first direction; the telescopic units connected with the movable battery cells in a one-to-one correspondence manner extend in the first direction along with the battery cells when the battery cells expand, so that the battery cells can freely move in the expansion direction, the self-adaptive adjustment of the expansion of the battery cells is realized, the flow channel width and the cooling efficiency of the battery cells are ensured, and the service life of the battery cells is prolonged. And a battery cell safety accident caused by reduction of the cooling efficiency is avoided.

Description

Technical Field

[0001] This application relates to the technical field of liquid cooling, and specifically relates to a liquid cooling box, and further relates to a battery pack including the liquid cooling box. Background Art

[0002] With the development of industrial and commercial energy storage, the thermal safety performance of energy storage products has attracted more and more attention. At present, the main cooling methods of industrial and commercial energy storage products on the market are air cooling and liquid cooling plate liquid cooling. The heat dissipation efficiency of air cooling is relatively low. Although the heat dissipation efficiency of liquid cooling plate liquid cooling has been improved, since the liquid cooling plate is usually located at the bottom of the battery cells, the heat dissipation is uneven, and the temperature of the battery cells near the liquid inlet is relatively low, while the temperature of the battery cells near the liquid outlet is relatively high, thus affecting the service life of the battery cells.

[0003] Therefore, an immersion liquid cooling solution is proposed. Usually, the battery pack is filled with a coolant, so that the battery cells are immersed in the coolant, and the heat generated during the operation of the battery cells is carried away by the circulating flow of the coolant. For the immersion liquid cooling solution in the form of a large surface flow channel of the battery cells, since the battery cells will undergo irreversible expansion during operation, the flow channels between the battery cells are continuously squeezed, and the width of the flow channels gradually decreases, which hinders the flow of the coolant, seriously affects the cooling efficiency, and easily leads to safety accidents of energy storage products. Summary of the Utility Model

[0004] The purpose of the present utility model is to provide a liquid cooling box and a battery pack having the same, aiming to solve the problem that the existing battery pack is prone to the problem that the coolant flow channel becomes narrow due to the expansion of the battery cells, which affects the cooling efficiency and is prone to cause safety accidents at the same time.

[0005] In order to achieve one of the foregoing purposes, according to one aspect of the present application, a liquid cooling box for installing a battery module is provided, including:

[0006] A box body, having an accommodation space formed inside, and a plurality of movable battery cells of the battery module can be movably installed in the accommodation space in sequence along a first direction;

[0007] A telescopic assembly, disposed in the accommodation space, and each battery module is connected to at least one telescopic assembly;

[0008] The telescopic assembly at least includes: a plurality of telescopic units arranged along the first direction and connectable to each movable battery cell in a one-to-one correspondence; the telescopic unit is configured to follow the expansion movement of the movable battery cell to extend along the first direction.

[0009] In addition to one or more of the above, or as an alternative, in another embodiment, the telescopic assembly is disposed between two adjacent columns of battery modules and / or between the battery module and the inner wall of the box body; when telescopic assemblies are disposed on both sides of the battery module, two opposite telescopic units on the two telescopic assemblies are correspondingly connected to one active battery cell.

[0010] In addition to one or more of the above, or as an alternative, in another embodiment, the telescopic unit includes a deployable polygonal structure, and the polygonal structures of two adjacent telescopic units are hinged to form a cross node for correspondingly connecting with an active battery cell.

[0011] In addition to one or more of the above, or as an alternative, in another embodiment, the polygonal structure is configured as a parallelogram structure and includes four connecting rods hinged end to end in sequence, and the four connecting rods at the connection of two adjacent parallelogram structures are hinged by the same pin shaft to form the cross node.

[0012] In addition to one or more of the above, or as an alternative, in another embodiment, the telescopic unit further includes:

[0013] A connecting plate, installed on at least one side of each cross node and configured to be connected to a side active battery cell.

[0014] In addition to one or more of the above, or as an alternative, in another embodiment, the telescopic unit includes a deployable polygonal structure and a support rod with one end connected to one hinge point of the polygonal structure; the other hinge point of the polygonal structure that is not collinear with the above hinge point can be connected to the support rods of other telescopic units, and a plurality of telescopic units are connected in sequence to form a telescopic assembly in which the polygonal structure and the support rods are alternately connected, and the support rod is configured to be correspondingly connected to an active battery cell.

[0015] In addition to one or more of the above, or as an alternative, in another embodiment, the polygonal structure is configured as a parallelogram structure, and one hinge point of the parallelogram structure is connected to one end of the support rod of the telescopic unit; the other hinge point of the parallelogram structure that is diagonally distributed with the above hinge point is connected to the support rods of other telescopic units, and a plurality of telescopic units are connected in sequence to form a telescopic assembly in which the parallelogram structure and the support rods are alternately connected.

[0016] In addition to one or more of the above, or as an alternative, in another embodiment, the telescopic unit includes: a connector configured to be connected to a corresponding movable battery cell and an elastic member having one end fixed to the connector, an end of the elastic member facing away from the connector is fixed to a connector of another telescopic unit, and the connectors of two adjacent telescopic units are slidably connected.

[0017] In addition to one or more of the above, or as an alternative, in another embodiment, the telescopic assembly further includes: two mounting seats fixedly mounted on the inner walls on both sides of the box along the first direction and configured to be connected to the first and rear telescopic units respectively.

[0018] In addition to one or more of the above, or as an alternative, in another embodiment, it also includes:

[0019] The partition guide rails are arranged at equal intervals on the inner bottom surface of the box body and extend along the first direction. They are configured to allow the power core to be slidably installed, and the distance between two adjacent partition guide rails is adapted to the width of the power core.

[0020] In addition to one or more of the above, or as an alternative, in another embodiment, it also includes:

[0021] An opening is provided at the top of the box body;

[0022] The cover body is detachably connected to the box body and is configured to block the opening to form the accommodating space.

[0023] In order to achieve one of the aforementioned purposes, according to another aspect of the present application, a battery pack is provided, which includes the liquid cooling box described in the aforementioned aspect, and a plurality of rows of battery modules arranged in parallel inside the box, one of the two outermost battery cells of each battery module is fixedly connected to the inner wall of the box, and the remaining battery cells are slidably connected to the inner bottom surface of the box.

[0024] In addition to one or more of the above, or as an alternative, in another embodiment, one of the two outermost battery cells of each battery module is fixedly connected to the inner wall of the box by double-sided adhesive foam.

[0025] Compared with the prior art, the beneficial effects of the present utility model are as follows: The liquid cooling box of the present application can movably install battery modules therein in sequence along the first direction. Each battery module is connected to at least one telescopic component. When the battery cell expands, the telescopic unit connected to each active battery cell one by one follows the expansion and extends along the first direction, so that the battery cell can move freely in the expansion direction to achieve adaptive adjustment of the battery cell expansion. While the telescopic component guides and limits the active battery cell, it avoids the active battery cell from shaking violently and hitting the inner wall of the box body, thereby ensuring the width of the coolant flow channel and the cooling efficiency of the battery cell, and avoiding the battery cell safety accident caused by the reduction of the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] With reference to the accompanying drawings, the disclosure of the present application will be more easily understood. It should be understood that these drawings are only for the purpose of illustration and are not intended to limit the protection scope of the present application.

[0027] In the figures:

[0028] Figure 1 is a three-dimensional structure diagram of a liquid cooling box provided by the present utility model when the cover is removed;

[0029] Figure 2 is a top view of a liquid cooling box provided by the present utility model when the cover is removed;

[0030] Figure 3 is a three-dimensional structure diagram of a telescopic component according to an embodiment provided by the present utility model;

[0031] Figure 4 is a side view of a telescopic component according to an embodiment provided by the present utility model;

[0032] Figure 5 is a side view of a telescopic component according to another embodiment provided by the present utility model;

[0033] Figure 6 is a side view of a telescopic component according to a third embodiment provided by the present utility model;

[0034] Figure 7 is Figure 1 a three-dimensional structure diagram of the liquid cooling box in

[0035] Figure 8 is Figure 7 a three-dimensional structure diagram of the liquid cooling box in

[0036] Figure 9 is Figure 7 a partial enlarged view of part A in

[0037] Figure 10 isFigure 8 Partial enlarged view at B in the [figure];

[0038] Figure 11 The three-dimensional structure diagram of a liquid cooling box provided by the present utility model.

[0039] In the attached drawings: 1 box body, 2 telescopic assembly, 21 telescopic unit, 211 polygonal structure, 212 connecting plate, 213 support rod, 214 elastic member, 215 connecting member, 3 partition guide rail, 4 opening, 5 cover body, 6 mounting seat, 7 double-sided adhesive foam. Specific embodiments

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will further describe the specific technical solutions of the present application in detail with reference to the accompanying drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application but are not used to limit the scope of the present application.

[0041] In the embodiments of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0042] In addition, in the embodiments of the present application, orientation terms such as "upper", "lower", "left", and "right" are defined relative to the orientation of the components shown in the accompanying drawings. It should be understood that these directional terms are relative concepts, which are used for relative description and clarification, and they may change accordingly with the change of the orientation of the components placed in the accompanying drawings.

[0043] In the embodiments of the present application, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or integrated; it can be directly connected or indirectly connected through an intermediate medium.

[0044] In the embodiments of the present application, the terms "include", "comprise", or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device including a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article, or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article, or device including such element.

[0045] In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or more advantageous than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0046] In the prior art, during the long cycle of a lithium-ion battery, as the SEI film thickens, the battery cell will undergo irreversible expansion, and the thickness of the battery cell increases during expansion. Since in an energy storage system, the expansion of the battery cell is restricted by the module structure, when the battery cell expands, a large expansion force will be generated inside the module structure, and the module structure will bear a large pressure.

[0047] In addition, a flow channel plate is provided between two adjacent battery cells in the battery module. In order to avoid the problem that the battery cell is unevenly stressed over a large area during expansion, which affects the service life of the battery cell, the flow channel plate is generally made of a soft material. However, correspondingly, when the battery cell expands, the flow channel plate will also squeeze the internal coolant flow channel when it is under pressure, resulting in a reduction in the flow channel width and hindering the flow of the coolant, thereby affecting the cooling efficiency of the battery cell. In severe cases, it may cause a safety accident. Therefore, improvements are made to the battery liquid cooling box.

[0048] Figures 1 to 4 FIG. 10 is a schematic structural diagram of a liquid cooling box according to an embodiment of the present application. The liquid cooling box includes: a box body 1 with an accommodation space formed therein, and a telescopic assembly 2 disposed in the accommodation space. A plurality of movable battery cells of the battery module can be sequentially movably installed in the accommodation space along a first direction, and each battery module is connected to at least one telescopic assembly 2; the telescopic assembly 2 at least includes: a plurality of telescopic units 21 arranged along the first direction and connectable to each movable battery cell in a one-to-one correspondence; the telescopic unit 21 is configured to follow the expansion movement of the movable battery cell and extend along the first direction.

[0049] Under this arrangement, for the liquid cooling box described herein, the battery modules can be sequentially movably installed therein along the first direction, and each battery module is connected to at least one telescopic assembly 2. When the battery cell expands, the telescopic unit 21 connected to each movable battery cell in a one-to-one correspondence follows its expansion and extends along the first direction, so that the battery cell can move freely in the expansion direction to achieve adaptive adjustment of the battery cell expansion. While the telescopic assembly 2 guides and positions the movable battery cell, it avoids the movable battery cell from shaking violently and hitting the inner wall of the box body 1, thereby ensuring the width of the coolant flow channel and the cooling efficiency of the battery cell, and avoiding the safety accident of the battery cell caused by the reduction of the cooling efficiency.

[0050] It should be noted that, in this embodiment, since the telescopic assembly 2 is provided with a plurality of telescopic units 21 correspondingly connected to the movable battery cells, it can thus adapt to the expansion movement of each movable battery cell. While connecting and limiting each movable battery cell, when the internal battery cells expand, the connected telescopic units 21 can extend, thereby realizing the adjustment of the distance between adjacent battery cells, and further ensuring the width of the flow channel.

[0051] In addition, the liquid cooling box proposed in this embodiment can avoid the problem that when a hard flow channel plate is used to ensure the width of the flow channel, the battery cells are subjected to uneven large-area stress during expansion, which affects the service life of the battery cells, saves the cost of the battery cells, and ensures the performance of the battery cells.

[0052] Specifically, the telescopic assembly 2 is arranged between two adjacent rows of battery modules and / or between the battery module and the inner wall of the box body 1; when telescopic assemblies 2 are arranged on both sides of the battery module, two opposite telescopic units 21 on the two telescopic assemblies 2 are correspondingly connected to one movable battery cell.

[0053] It can be known that by installing the telescopic assembly 2 between two adjacent rows of battery modules and between the battery module and the inner wall of the box body 1, the corresponding connection of the movable battery cells can be realized to ensure that each battery module is connected to at least one telescopic assembly 2.

[0054] In one case of this embodiment, the telescopic assembly 2 can be installed between two adjacent rows of battery modules and between the battery module and the inner wall of the box body 1, so as to ensure that telescopic assemblies 2 are installed on both sides of each row of battery modules. At this time, two opposite telescopic units 21 on the two telescopic assemblies 2 located on both sides of the battery module are correspondingly connected to one movable battery cell to ensure that the movable battery cell can move freely along the expansion direction.

[0055] In another case of this embodiment, each row of battery modules can be connected to only one telescopic assembly 2. By using the multiple telescopic units 21 on the telescopic assembly 2, the expansion movement adjustment of multiple battery cells can also be realized.

[0056] During the actual operation of this embodiment, the telescopic assembly 2 can also be installed on the inner wall of the box body 1 above or below the battery module, so as to connect the telescopic assembly 2 with one or more groups to the battery module to realize the expansion adjustment of the movable battery cells inside. Therefore, the specific installation position and the installation quantity of the telescopic assembly 2 are not restrictive regulations of this embodiment.

[0057] In one implementation manner of this embodiment, referring to Figure 3 and Figure 4 , the telescopic unit 21 includes a deployable polygonal structure 211, and the deployable polygonal structures 211 of two adjacent telescopic units 21 are hinged to form a cross node for correspondingly connecting with the movable battery cell.

[0058] It is not difficult to see that the telescopic unit 21 is set as a deployable polygonal structure 211, so that when it is subjected to an external force, it can deform. The deployable polygonal structures 211 of two adjacent telescopic units 21 can form cross nodes corresponding to the connection of the movable battery cells at the hinge points, so as to realize the free movement of the battery cells connected to the cross nodes by using the deployable polygonal structure 211.

[0059] More specifically, as Figure 4 shown, the deployable polygonal structure 211 is configured as a parallelogram structure and includes four connecting rods hinged in sequence at the head and tail. The four connecting rods at the connection of two adjacent parallelogram structures are hinged by the same pin shaft to form cross nodes.

[0060] It can be known that by setting the above-mentioned deployable polygonal structure 211 as a parallelogram structure, the free movement of the battery cells is realized by using the extensible characteristics of the parallelogram structure. The four connecting rods at the connection of two adjacent parallelogram structures are hinged by the same pin shaft to form cross nodes, so as to facilitate the connection of the battery cells through the cross nodes.

[0061] In addition, holes can be drilled at the middle positions of any two sides of the parallelogram structure, and the connection and fixation between the two are realized by using the pin shaft, and this place is used as the cross node corresponding to the connection of the battery cells. Therefore, the specific connection method of the parallelogram structure is not specifically limited in this embodiment.

[0062] It should be noted that the above-mentioned deployable polygonal structure 211 can also be a regular hexagon or a regular octagon formed by sequentially hinging multiple connecting rods at the head and tail. By using the deformable characteristics of this structure, the expansion movement adjustment of the battery cells is realized. Therefore, the specific shape of the above-mentioned deployable polygonal structure 211 is not a restrictive regulation of this embodiment.

[0063] Furthermore, as Figure 4 shown, the telescopic unit 21 further includes a connecting plate 212 installed on at least one side of each cross node and configured to connect the adjacent movable battery cells.

[0064] It is not difficult to see that by using this connecting plate 212, it is more convenient to connect the battery cells and the cross nodes correspondingly, and the connecting plate 212 can be arranged on one side of the cross node or on both sides of it. The two methods respectively correspond to the situation where the telescopic assembly 2 is located between the battery module and the inner wall of the box body 1, and the situation where the telescopic assembly 2 is located between two battery modules; therefore, the specific arrangement method of the connecting plate 212 is not a restrictive regulation of this embodiment.

[0065] Even further, as Figure 4As shown, the telescopic assembly 2 further includes: two mounting seats 6 fixedly installed on the inner walls of both sides of the box body 1 along the first direction and configured to be respectively connected to the first and last telescopic units 21. With the above two mounting seats 6, it is convenient to install the telescopic unit 21 on the inner walls of both sides of the box body 1 located in the first direction.

[0066] It should be noted that when the telescopic assembly 2 is arranged on both sides of the battery module, both ends of the telescopic assembly 2 are fixed on the inner walls of both sides of the box body 1 through the mounting seats 6, thereby restricting the degrees of freedom of the battery cells in other directions and avoiding damage to the box body 1 and other electrical components inside the box body 1 when shaking freely in all directions.

[0067] In another implementation manner of this embodiment, referring to Figure 5 , the telescopic unit 21 includes a deployable polygonal structure 211 and a support rod 213 with one end connected to one hinge point of the deployable polygonal structure 211; another hinge point of the polygonal structure 211 that is not collinear with the above hinge point can be connected to the support rod 213 of other telescopic units 21. A plurality of telescopic units 21 are connected in sequence to form a telescopic assembly 2 in which the polygonal structure 211 and the support rod 213 are alternately connected, and the support rod 213 is configured to be correspondingly connected to the movable battery cells.

[0068] It is not difficult to see that the telescopic unit 21 adopting the deployable polygonal structure 211 and the support rod 213 can be alternately connected to form a telescopic assembly 2, where the support rod 213 can be connected to the battery cells, and the deployable polygonal structure 211 is convenient for deforming to realize the overall extension of the telescopic unit 21. During actual operation, the connection between the battery cells and the telescopic unit 21 is more stable.

[0069] Specifically, the deployable polygonal structure 211 is configured as a parallelogram structure, and one hinge point of the parallelogram structure is connected to one end of the support rod 213 of this telescopic unit 21; another hinge point of the parallelogram structure that is diagonally distributed with the above hinge point is connected to the support rod 213 of other telescopic units 21. A plurality of telescopic units 21 are connected in sequence to form a telescopic assembly 2 in which the parallelogram structure and the support rod 213 are alternately connected.

[0070] It can be known that through the telescopic assembly 2 in which the parallelogram structure and the support rod 213 are alternately connected, the self-adaptive adjustment in the expansion direction of the battery cells is realized by using the bendable characteristic of the parallelogram structure.

[0071] In actual operation, the battery cells of the battery module can be installed one by one on one side of the support rod 213, and the battery cells are arranged in sequence. At this time, the two polygonal structures 211 located at both ends of the support rod 213 can provide them with expansion and contraction space in both directions; of course, two adjacent battery cells of the battery module can also be fixed at both ends of the same support rod 213, and the battery cells are arranged in sequence. At this time, one of the polygonal structures 211 located at the other end of the support rod 213 can provide them with expansion and contraction space in one direction, and can also meet the adaptive adjustment requirements when the battery expands. Therefore, the specific installation method of the support rod 213 and the battery cells can be selected as needed, and this embodiment is not specifically limited here.

[0072] It should be noted that the above-mentioned parallelogram structure also adopts four connecting rods hinged end to end, and the above-mentioned foldable polygonal structure 211 can also be a regular hexagon or a regular octagon with multiple connecting rods hinged end to end. It is only necessary to ensure the hinge point between the support rod 213 and the polygonal structure 211 so as to achieve the distance adjustment between two adjacent support rods 213 along the expansion direction of the battery cell. Therefore, the specific shape of the above-mentioned foldable polygonal structure 211 is not a restrictive provision of this embodiment.

[0073] During the actual use of the battery cell, reversible expansion may occur. In this scenario, the expansion force of the battery cell is mainly caused by the negative electrode. During the charge and discharge cycle of the battery cell, lithium ions are embedded in the layered material, causing the thickness of the electrode to increase. This expansion is reversible.

[0074] In another implementation of the present embodiment, the telescopic unit 21 includes: a connector 215 configured to be connected to a corresponding movable battery cell and an elastic member 214 having one end fixed to the connector 215, the end of the elastic member 214 facing away from the connector 215 is fixed to the connector 215 of another telescopic unit 21, and the connectors 215 of two adjacent telescopic units 21 are slidably sleeved.

[0075] It can be known that, by slidingly sleeved connecting members 215 and elastic members 214 together, the free movement of the battery cells during expansion can be achieved through the sliding sleeve effect between adjacent connecting members 215, and the elastic member 214 connected to the connecting member 215 can utilize its own elastic force to achieve the two connecting members 215 to move closer or farther away, so that when the battery cells undergo reversible expansion, the elastic member 214 can achieve reset adjustment between the battery cells or reduce the gap between adjacent battery cells to ensure the normal arrangement of the battery cells.

[0076] Exemplarily, during the connection of the elastic member 214 and the connecting member 215, one end of the elastic member 214 can be fixed to the outer wall of one connecting member 215, and the other end can be fixed to the outer wall of another connecting member 215 adjacent to the above-mentioned connecting member 215, or other components can be used for connection. Therefore, regarding the specific structure of the telescopic unit 21 above, it is not a restrictive regulation of this embodiment.

[0077] It should be noted that on the side of the two connecting members 215 located at both ends and needing to be connected to the mounting base 6 and close to the mounting base 6, no socket part is provided, so as to facilitate the effective fixed installation of the two connecting members 215 at both ends along the arrangement direction of the battery cells.

[0078] During the actual operation of this embodiment, the connecting member 215 includes a fixing part located in the middle position and used for fixing to the battery cell, and socket parts provided on both sides of the fixing part and used for sliding connection with other connecting members 215. And the inner diameters of the socket parts on both sides of the same fixing part are different, so as to realize the sliding socket connection of two adjacent connecting members 215; and both ends of the elastic member 214 abut against the fixing parts of two adjacent connecting members 215, so as to realize the elastic force effect.

[0079] Exemplarily, the above-mentioned fixing part can be a fixing block, and the socket part can be a sleeve or a sleeve rod integrated with the fixing block. Of course, it can also be other socket structures. By using the socket connection between adjacent connecting members 215, the expansion guidance between different battery cells is realized. The above-mentioned elastic member 214 can be a spring or a tension spring, or other elastic structures, and the expansion reset of the battery or the reduction of the gap between the battery cells is realized by using its own elastic force. Regarding the specific structures of the connecting member 215 and the elastic member 214, they can be selected according to needs, and this embodiment does not make specific limitations here.

[0080] In one case of this embodiment, refer to Figure 1 、 Figure 8 and Figure 9 , it further includes partition guide rails 3 arranged at equal intervals on the inner bottom surface of the box body 1 and extending along the first direction. The partition guide rails 3 are configured to slidably mount the battery cells, and the distance between two adjacent partition guide rails 3 is adapted to the width of the battery cells.

[0081] It can be known that by using the partition guide rails 3 arranged at equal intervals on the inner bottom surface of the box body 1, the battery module can be slidably mounted between the two partition guide rails 3, providing a basis for the expansion movement of the battery.

[0082] It should be noted that the above-mentioned partition guide rails 3 are arranged at equal intervals along the second direction, and the second direction is the direction perpendicular to the arrangement direction of the battery cells; therefore, the number of the partition guide rails 3 is equal to the number of battery modules plus one. Of course, the partition guide rails 3 can also be slidably connected to each battery module one by one. This embodiment does not make specific limitations here.

[0083] In another case of this embodiment, as Figure 1 and Figure 11 shown, it further includes: an opening 4 formed at the top of the box body 1; and a cover body 5 detachably connected to the box body 1, and the cover body 5 is configured to block the opening 4 to form a receiving space.

[0084] This application also proposes a battery pack, including the liquid cooling box described above, and multiple columns of battery modules arranged in parallel inside the box body 1. One of the outermost end electric cores of each battery module is fixedly connected to the inner wall of the box body 1, and the remaining electric cores are slidably connected to the inner bottom surface of the box body 1.

[0085] Further, referring to Figure 10 , one of the outermost end electric cores of each battery module is fixedly connected to the inner wall of the box body 1 through a double-sided adhesive foam 7.

[0086] It can be known that by installing the battery module in the above liquid cooling box, one of the outermost end electric cores of the battery module is fixedly connected to the inner wall of the box body 1, and the remaining electric cores are slidably connected to the inner bottom surface of the box body 1. Thus, by using a plurality of telescopic units 21 correspondingly connected to each movable electric core, while connecting and limiting each movable electric core, when the internal electric core expands, the telescopic unit 21 connected thereto extends, so as to realize the adjustment of the distance between adjacent electric cores, and further ensure the width of the flow channel and the cooling efficiency of the electric cores.

[0087] The above examples mainly illustrate a liquid cooling box of this application and a battery pack including the liquid cooling box. Although only some embodiments of this application are described, those of ordinary skill in the art should understand that this application can be implemented in many other forms without departing from its gist and scope. Therefore, the examples and embodiments shown are regarded as illustrative rather than restrictive, and this application may cover various modifications and substitutions without departing from the spirit and scope of the technical solution of this application.

Claims

1. A liquid cooling box for installing a battery module, characterized in that, Comprising: A box body, within which an accommodation space is formed, and a plurality of movable battery cells of a battery module can be movably installed in sequence in the accommodation space along a first direction; A telescopic assembly disposed in the accommodation space, and each battery module is connected to at least one telescopic assembly; The telescopic assembly at least includes: a plurality of telescopic units arranged along the first direction and configured to be connected to each movable battery cell in a one-to-one correspondence; The telescopic unit is configured to follow the expansion movement of the movable battery cell to extend along the first direction.

2. The liquid cooling box according to claim 1, characterized in that, The telescopic assembly is disposed between two adjacent columns of battery modules and / or between the battery module and the inner wall of the box body; when telescopic assemblies are disposed on both sides of the battery module, two opposite telescopic units on the two telescopic assemblies are correspondingly connected to one movable battery cell.

3. The liquid cooling box according to claim 1 or 2, characterized in that, The telescopic unit includes a foldable and unfoldable polygonal structure, and the polygonal structures of two adjacent telescopic units are hinged to form a cross node for corresponding connection with the movable battery cell.

4. The liquid cooling box according to claim 3, characterized in that The polygonal structure is configured as a parallelogram structure and includes four connecting rods hinged end to end in sequence. Four connecting rods at the connection of two adjacent parallelogram structures are hinged through the same pin shaft to form the cross node.

5. The liquid cooling box according to claim 3, characterized in that The telescopic unit further includes: A connecting plate installed on at least one side of each cross node and configured to be connected to the adjacent movable battery cell.

6. The liquid cooling box according to claim 1 or 2, characterized in that, The telescopic unit includes a foldable and unfoldable polygonal structure and a support rod with one end connected to one hinge point of the polygonal structure; the other hinge point of the polygonal structure that is not on the same side as the above hinge point can be connected to the support rods of other telescopic units, and a plurality of telescopic units are connected in sequence to form a telescopic assembly in which the polygonal structure and the support rods are alternately connected, and the support rod is configured to be connected to the movable battery cell in a corresponding manner.

7. The liquid cooling box according to claim 6, wherein The polygonal structure is configured as a parallelogram structure, and one hinge point of the parallelogram structure is connected to one end of the support rod of the telescopic unit; the other hinge point of the parallelogram structure that is diagonally distributed with the above hinge point is connected to the support rods of other telescopic units, and a plurality of telescopic units are connected in sequence to form a telescopic assembly in which the parallelogram structure and the support rods are alternately connected.

8. The liquid cooling box according to claim 1 or 2, characterized in that, The telescopic unit includes: a connecting piece configured to be connected to the movable battery cell in a corresponding manner and an elastic piece with one end fixed to the connecting piece. The end of the elastic piece away from the connecting piece is fixed to the connecting piece of another telescopic unit, and the connecting pieces of two adjacent telescopic units are slidably sleeved.

9. The liquid cooling box according to claim 1, characterized in that The telescopic assembly further includes: two mounting seats fixedly installed on the inner walls of two sides of the box body along the first direction and configured to be respectively connected to the first and last telescopic units.

10. The liquid cooling box according to claim 1, characterized in that, Further comprising: Partition rails, which are arranged at equal intervals on the inner bottom surface of the box body and extend along the first direction, and are configured to enable the battery cells to be slidably installed, and the distance between two adjacent partition rails is adapted to the width of the battery cell.

11. The liquid cooling box according to claim 1, wherein, Further comprising: An opening opened at the top of the box body; A cover body detachably connected to the box body and configured to block the opening to form the accommodation space.

12. A battery pack, characterized in that, It includes a liquid cooling box as described in any one of claims 1-11, and multiple columns of battery modules arranged in parallel inside the box body. One of the outermost cells of each battery module is fixedly connected to the inner wall of the box body, and the remaining cells are slidably connected to the inner bottom surface of the box body.

13. The battery pack according to claim 12, characterized in that, One of the outermost cells of each battery module is fixedly connected to the inner wall of the box body through a double-sided adhesive foam.

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