A battery box and a battery pack

Abstract

This invention provides a battery box and a battery pack. The battery box includes a box body, a plurality of first cooling plates, and a fastening assembly; the box body forms a main chamber; the plurality of first cooling plates are spaced apart in the main chamber to divide the main chamber into a plurality of sub-chambers, the plurality of sub-chambers being configured to accommodate battery modules; the fastening assembly is fixedly connected to the box body; wherein the plurality of first cooling plates are detachably connected to the fastening assembly. This invention aims to solve the technical problem in related technologies where the welded joints of the battery box and cooling plates are prone to deformation, affecting the sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery box and a battery pack. Background Technology

[0002] The battery box has multiple functions, including insulating the internal battery modules, preventing them from coming into contact with water, and protecting them from impacts and abrasions. In related technologies, cooling plates are often fixed to the battery box by welding. During the welding process, multiple weld points are often set on the battery box to facilitate the connection between the cooling plate and the battery box. The concentrated heat input generated during welding can cause localized deformation at the welded area between the cooling plate and the battery box, leading to uncontrollable plastic deformation in the welded area and surrounding structure, affecting the airtightness of the battery box. Utility Model Content

[0003] The present invention provides a battery box and a battery pack, which aims to solve the technical problem in the related art that the welded part is prone to deformation when the battery box is welded to the cooling plate, which affects the sealing performance.

[0004] In a first aspect, embodiments of the present invention provide a battery box, comprising: The box-shaped enclosure forms a main chamber; Multiple first cooling plates are spaced apart in the main chamber to divide the main chamber into multiple sub-chambers, and the multiple sub-chambers are configured to accommodate battery modules; and, Fastening components are fixedly connected to the housing; The plurality of the first cooling plates are detachably connected to the fastening assembly.

[0005] In some embodiments, the fastening assembly includes a first connecting plate disposed on the housing; One end of each of the first cooling plates is connected to the first connecting plate.

[0006] In some embodiments, the first connecting plate is formed with a plurality of snap-fit ​​slots; One end of each of the first cooling plates is snapped into the corresponding snap-fit ​​groove to fix the plurality of first cooling plates relative to the housing.

[0007] In some embodiments, a plurality of first through holes are formed on the groove wall of each of the snap-fit ​​slots; The fastening assembly also includes a plurality of fasteners, each of which passes through a corresponding first through hole and is connected to one end of each first cooling plate.

[0008] In some embodiments, the fastening assembly further includes a second connecting plate, which is spaced apart from the first connecting plate and is fixedly connected to the housing. The other end of the plurality of first cooling plates is connected to the second connecting plate.

[0009] In some embodiments, a plurality of clearance holes are formed on the second connecting plate; One end of each of the first cooling plates passes through the clearance hole, so that the plurality of first cooling plates are connected to the second connecting plate.

[0010] In some embodiments, the battery box further includes a plurality of connecting pipes, and adjacent two first cooling plates are connected by at least one of the connecting pipes.

[0011] In some embodiments, the housing includes: Base plate; Two second cooling plates are spaced apart on the base plate along the width direction of the base plate, and the two second cooling plates are used to cool the battery module; Two end plates are spaced apart on the base plate along the length of the base plate; The base plate, the two second cooling plates, and the two end plates form the main cavity.

[0012] In some embodiments, the fastening assembly further includes a first connecting plate fixedly connected between the two second cooling plates and spaced apart from one of the end plates to form a first spacer cavity configured to accommodate a control assembly; and / or, The fastening assembly further includes a second connecting plate, which is fixedly connected between the two second cooling plates and spaced apart from one of the end plates to form a second spacer cavity, which is configured to accommodate a cooling pipe.

[0013] In some embodiments, one of the two second cooling plates has an inlet and the other has an outlet, and the two second cooling plates are connected through a plurality of first cooling plates to form a cooling circuit.

[0014] Secondly, embodiments of this utility model provide a battery pack, including a battery case, the battery case comprising: The box-shaped enclosure forms a main chamber; Multiple first cooling plates are spaced apart in the main chamber to divide the main chamber into multiple sub-chambers, and the multiple sub-chambers are configured to accommodate battery modules; and, Fastening components are fixedly connected to the housing; The plurality of the first cooling plates are detachably connected to the fastening assembly.

[0015] The beneficial effects of the embodiments of this utility model are as follows: In the technical solution of this application, the fastening assembly is fixedly connected to the housing, and multiple first cooling plates are detachably connected to the fastening assembly. That is, multiple first cooling plates are fixed to the housing through the fastening assembly without welding, which can achieve the fixation of multiple first cooling plates to the housing. The sealing performance is good and the connection strength is high, which can avoid the problem of poor sealing performance due to too many weld points in the welding process. At the same time, multiple first cooling plates are spaced apart in the main chamber to divide the main chamber into multiple sub-chambers, which results in higher cooling efficiency, better cooling effect, and avoidance of thermal runaway. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the battery box provided in some embodiments of this utility model; Figure 2 yes Figure 1 A schematic diagram of the structure of the first connecting plate in the middle; Figure 3 yes Figure 1 A schematic diagram of the structure in which the first connecting plate and multiple first cooling plates cooperate; Figure 4 yes Figure 1 A schematic diagram of the structure of the second connecting plate in the middle; Figure 5 yes Figure 1 A schematic diagram of the structure in which the second connecting plate and multiple first cooling plates cooperate; Figure 6 yes Figure 1 A schematic diagram of the middle box structure.

[0018] Explanation of icon numbers 100. Battery box; 10. Box body; 11. Main chamber; 111. Sub-chamber; 12. Base plate; 13. Second cooling plate; 14. End plate; 20. First cooling plate; 30. Fastening assembly; 31. First connecting plate; 311. Snap-fit ​​groove; 312. First through hole; 313. Fixing member; 32. Second connecting plate; 321. Clearance hole; 41. First partition cavity; 42. Second partition cavity; 51. Inlet; 52. Outlet; 60. Connecting pipe. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0020] The battery box has multiple functions, including insulating the internal battery modules, preventing them from coming into contact with water, and protecting them from impacts and abrasions. In related technologies, cooling plates are often fixed to the battery box by welding. During the welding process, multiple weld points are often set on the battery box to facilitate the connection between the cooling plate and the battery box. The concentrated heat input generated during welding can cause localized deformation at the welded area between the cooling plate and the battery box, leading to uncontrollable plastic deformation in the welded area and surrounding structure, affecting the airtightness of the battery box.

[0021] In view of this, the present invention proposes a battery box 100. Figures 1 to 6 The following are structural schematic diagrams of some embodiments of the battery box 100 provided by this utility model. The battery box 100 provided by this utility model has a simple structure and a simple fixing method, which can reduce the impact of welding process. The battery box 100 will be described in detail below with reference to the main drawings.

[0022] Please see Figure 1 This application provides a battery box 100, which includes a box body 10, a plurality of first cooling plates 20 and a fastening assembly 30; the box body 10 forms a main chamber 11; the plurality of first cooling plates 20 are spaced apart in the main chamber 11 to divide the main chamber 11 into a plurality of sub-chambers 111, and the plurality of sub-chambers 111 are configured to accommodate battery modules; the fastening assembly 30 is fixedly connected to the box body 10; wherein the plurality of first cooling plates 20 are detachably connected to the fastening assembly 30.

[0023] In the technical solution of this application, the fastening component 30 is fixedly connected to the housing 10, and the multiple first cooling plates 20 are detachably connected to the fastening component 30. That is, the multiple first cooling plates 20 are fixed to the housing 10 by the fastening component 30 without welding. The multiple first cooling plates 20 can be fixed to the housing 10 without welding. The sealing performance is good and the connection strength is high. It can avoid the problem of poor sealing performance due to too many weld points in the welding process. At the same time, the multiple first cooling plates 20 are spaced apart in the main chamber 11 to divide the main chamber 11 into multiple sub-chambers 111, which has higher cooling efficiency and better cooling effect, and avoids thermal runaway.

[0024] Please see Figure 1 ,by Figure 1 Taking the first direction as an example, the first direction intersects with the second direction, the first direction intersects with the third direction, and the second direction intersects with the third direction. The first direction, the second direction, and the third direction are located in different planes. The included angle between any two of the first direction, the second direction, and the third direction is not limited and can be 80°, 85°, 90°, 95°, or 100°. In the following embodiments, the included angle between any two of the first direction, the second direction, and the third direction is 90°, that is, some embodiments of this application are explained by establishing a spatial rectangular coordinate system using the first direction, the second direction, and the third direction. It should be emphasized that the included angle between any two of the first direction, the second direction, and the third direction is 90° and does not constitute a limitation on the following embodiments of this application. In this embodiment, the first direction is the length direction of the box 10, the second direction is the width direction of the box 10, and the third direction is the height direction of the box 10.

[0025] Please continue reading. Figure 1 Multiple first cooling plates 20 extend along a first direction and are spaced apart along a second direction. The multiple first cooling plates 20 divide the main chamber 11 into multiple sub-chambers 111, each of which can accommodate a battery module. This arrangement increases the contact area between the battery module and the first cooling plates 20, so that both sides of a battery module can contact the first cooling plates 20. The heat of the battery module can be quickly carried away by the first cooling plates 20, improving cooling efficiency and achieving rapid heat dissipation, thus avoiding thermal runaway.

[0026] In some embodiments, in order to improve cooling efficiency, a phase change material can also be provided in the first cooling plate 20. The phase change material has a very low safety hazard to the battery. When the phase change material is provided in the first cooling plate 20, it can absorb heat as the energy for its phase change when it encounters the short-term high temperature of the battery cell, so that the battery cell is always kept in a safe temperature range and thermal runaway is avoided.

[0027] In some embodiments, the battery module includes multiple batteries, and the arrangement of the multiple batteries is not limited and can be set according to the actual situation. In some embodiments, the batteries are square batteries, and multiple square batteries are arranged sequentially along a first direction to form a battery module.

[0028] In some embodiments, a cooling channel is formed within the first cooling plate 20, and a cooling medium flows within the cooling channel. The cooling channel includes multiple sub-channels, which are spaced apart along a third direction and extend along a first direction. It should be noted that during the cooling process, as the cooling medium flows, its temperature continuously rises; that is, the temperature of the cooling medium at the inlet 51 of the first cooling plate 20 is lower than the temperature of the cooling medium at the outlet 52 of the first cooling plate 20. In this embodiment, the cooling medium within the cooling channel can flow through the same battery at least twice. The battery that is first passed by the cooling medium is passed through later, and vice versa. Since the temperature of the cooling medium gradually rises during the cooling process, its cooling effect gradually decreases. Therefore, the battery with better cooling effect when the cooling medium first flows through will have a worse cooling effect when the cooling medium flows through it a second time, and vice versa. This back-and-forth cooling effect is superimposed, balancing the cooling effect obtained by the batteries in the same row, ensuring that multiple batteries are in a uniform temperature state, avoiding localized high temperatures, and improving the lifespan of multiple batteries.

[0029] In some embodiments, the fastening assembly 30 includes a first connecting plate 31 disposed on the housing 10. The connection method between the first cooling plate 20 and the housing 10 is not limited. For example, the first connecting plate 31 may be snapped into the housing 10, or the first connecting plate 31 may be fixed inside the housing 10 by a threaded connection. One end of each of the multiple first cooling plates 20 may be fixedly connected to the first connecting plate 31. By fixing the multiple first cooling plates 20 to the first connecting plate 31, they are relatively fixed to the housing 10. This arrangement ensures that there is no connection between the first cooling plates 20 and the housing 10, eliminating the need for other structures (such as grooves, threaded holes, welding areas, etc.) on the housing 10, thus guaranteeing the integrity of the housing 10 and improving its airtightness.

[0030] The connection method between the first connecting plate 31 and the multiple first cooling plates 20 is not limited and can be set according to the actual situation.

[0031] For example, in some embodiments, please refer to Figure 2 and Figure 3The first connecting plate 31 has a plurality of snap-fit ​​slots 311. The plurality of snap-fit ​​slots 311 are spaced apart along the second direction and extend along the third direction. One end of each first cooling plate 20 snaps into the corresponding snap-fit ​​slot 311 to fix the plurality of first cooling plates 20 relative to the housing 10. In this way, one end of the first cooling plate 20 is fixed on the first connecting plate 31, thereby fixing the first cooling plate 20 to the housing 10.

[0032] Furthermore, to improve the connection strength, in some embodiments, the fastening assembly 30 further includes multiple fasteners 313. Each snap-fit ​​groove 311 has multiple first through holes 312 formed on its groove wall. Each first cooling plate 20 also has a second through hole corresponding to the first through hole 312. During installation, one end of the first cooling plate 20 is snapped into the snap-fit ​​groove 311, so that the second through hole corresponds to the first through hole 312. Each fastener 313 passes through the corresponding first through hole 312 and is fixedly connected to one end of each first cooling plate 20. This improves the connection strength between the first cooling plate 20 and the first connecting plate 31, preventing the first cooling plate 20 from detaching from the first connecting plate 31 due to expansion caused by heat generated during battery module operation.

[0033] In some embodiments, the fastener is an expansion bolt, and the second through hole is formed by casting. During the forming of the second through hole, a wire thread insert is pre-embedded in the second through hole to improve the connection strength of the second through hole.

[0034] Please see Figure 4 and Figure 5 In some embodiments, the fastening assembly 30 further includes a second connecting plate 32, which is spaced apart from the first connecting plate 31 and fixedly connected to the housing 10. The battery module is disposed between the first connecting plate 31 and the second connecting plate 32, and the other end of a plurality of first cooling plates 20 is connected to the second connecting plate 32. The plurality of first cooling plates 20 are fixed relative to the housing 10 by being connected to the second connecting plate 32. This arrangement ensures that there is no connection between the first cooling plates 20 and the housing 10, eliminating the need for other structures (such as grooves, threaded holes, welding areas, etc.) on the housing 10, thus maintaining the integrity of the housing 10 and improving its airtightness. In this way, both ends of the first cooling plates 20 are fixed inside the housing 10, increasing the connection strength of the first cooling plates 20.

[0035] The connection method between the second connecting plate 32 and the multiple first cooling plates 20 is not limited; it can be set according to the actual situation.

[0036] For example, in some embodiments, please continue to refer to Figure 4 and Figure 5The second connecting plate 32 has a plurality of clearance holes 321; the other end of each first cooling plate 20 is engaged with the clearance hole 321 so that the plurality of first cooling plates 20 are connected to the second connecting plate 32, and the second connecting plate 32 is fixedly connected inside the housing 10, thereby realizing that the other end of the plurality of first cooling plates 20 is fixed to the housing 10.

[0037] It should be noted that the formation method of the clearance hole 321 is not limited. In some embodiments, a plurality of square holes are directly formed on the second connecting plate 32, and the other end of the first cooling plate 20 passes through the square holes and is snapped onto the second connecting plate 32. In other embodiments, the second connecting plate 32 includes a plurality of sub-connecting plates, which are spaced apart along the second direction. A clearance hole 321 is formed between two adjacent sub-connecting plates, and the other end of the first cooling plate 20 passes through the clearance hole 321, so that the first cooling plate 20 is relatively fixed between two adjacent sub-connecting plates.

[0038] In some embodiments, a clearance hole 321 is formed between two adjacent sub-connecting plates. In order to ensure the stability of the connection between the first cooling plate 20 and the two adjacent sub-connecting plates, a screw hole is formed at the upper end of the sub-connecting plate. The fastening assembly 30 also includes a fixing plate. The two ends of the fixing plate are respectively fixed to the sub-connecting plate through screw holes. The middle of the fixing plate abuts against the first cooling plate 20, thereby ensuring the stability of the connection between the first cooling plate 20 and the second connecting plate 32.

[0039] Please see Figure 1 In some embodiments, one end of the first cooling plate 20 connected to the second connecting plate 32 extends out of the second connecting plate 32, and a connecting hole is formed at the end of the first cooling plate 20 extending out of the second connecting plate 32. The system also includes multiple connecting pipes 60, with at least one connecting pipe 60 connecting adjacent first cooling plates 20. Specifically, between two adjacent first cooling plates 20, one end of the connecting pipe 60 connects to the connecting hole of one first cooling plate 20, and the other end of the connecting pipe connects to the connecting hole of another first cooling plate 20. In this way, multiple first cooling plates 20 are interconnected, forming a cooling circuit.

[0040] Please see Figure 6 In some embodiments, the housing 10 includes a bottom plate 12, two second cooling plates 13 and two end plates 14; the two second cooling plates 13 extend along a first direction and are spaced apart on the bottom plate 12 along the width direction (i.e., the second direction), and the two second cooling plates 13 are used to cool the battery module; the two end plates 14 extend along the second direction and are spaced apart on the bottom plate 12 along the length direction (i.e., the first direction); wherein the bottom plate 12, the two second cooling plates 13 and the two end plates 14 enclose a total cavity 11.

[0041] Please continue reading. Figure 1 In some embodiments, the fastening assembly 30 further includes a first connecting plate 31, which is fixedly connected between the two second cooling plates 13 and spaced apart from one of the end plates 14 to form a first spacer cavity 41, configured to accommodate a control assembly. It should be noted that the connection method between the first connecting plate 31 and the housing 10 is not limited. The two second cooling plates 13 are used to cool the battery module, and each second cooling plate 13 has a cooling channel. Therefore, the first connecting plate 31 is fixedly connected to the base plate 12, thereby avoiding connection with the two second cooling plates 13 and improving the sealing performance of the second cooling plates 13. The connection method between the first connecting plate 31 and the base plate 12 is not limited; it can be a threaded connection, a connection fixed with glue, or a welding connection.

[0042] In other embodiments, please continue to refer to Figure 1 The fastening assembly 30 also includes multiple second connecting plates 32, which are disposed in the housing and spaced apart from one of the end plates 14. Two adjacent second cooling plates 13 are connected to one second connecting plate 32. The second connecting plates 32 are spaced apart from one of the end plates 14 to form a second spacer cavity 42, which is configured to accommodate cooling pipes. The two second cooling plates 13 are used to cool the battery module. The second cooling plates 13 have cooling channels. Therefore, the second connecting plate 32 is fixedly connected to the base plate 12, thereby avoiding connection with the two second cooling plates 13 and improving the sealing performance of the second cooling plates 13. The connection method between the second connecting plate 32 and the base plate 12 is not limited; it can be a threaded connection, a connection fixed by glue, or a welding connection.

[0043] In some embodiments, one of the two second cooling plates 13 has an inlet 51 and the other has an outlet 52. The two second cooling plates 13 are connected through a plurality of first cooling plates 20 to form a cooling circuit. Specifically, the cooling medium enters the second cooling plate 13 from the inlet 51, flows from the second cooling plate 13 to the plurality of first cooling plates 20, then flows from the plurality of first cooling plates 20 to the other second cooling plate 13, and exits from the outlet 52, completing the cooling cycle.

[0044] It should be noted that the type of cooling medium in the above embodiments is not limited, and can be selected according to the actual application. For example, the cooling medium can be lubricating oil, water, air, alcohol compounds, etc.

[0045] This utility model also proposes a battery pack, which includes the aforementioned battery box 100. The specific structure of the battery box 100 is as described in the above embodiments. Since this battery pack adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0046] Furthermore, this utility model also proposes an electrical device, which includes the aforementioned battery pack. The specific structure of the battery pack is described in the above embodiments. Since this electrical device adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated upon further here.

[0047] It is understood that the electrical equipment mentioned includes, but is not limited to, electric toys, power tools, electric vehicles, automobiles, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. Automobiles can be gasoline-powered vehicles, natural gas-powered vehicles, and new energy vehicles.

[0048] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery box characterized by, include: The box-shaped enclosure forms a main chamber; Multiple first cooling plates are spaced apart in the main chamber to divide the main chamber into multiple sub-chambers, and the multiple sub-chambers are configured to accommodate battery modules; as well as, Fastening components are fixedly connected to the housing; The plurality of the first cooling plates are detachably connected to the fastening assembly.

2. The battery pack of claim 1, wherein, The fastening assembly includes a first connecting plate, which is disposed in the housing; One end of each of the first cooling plates is connected to the first connecting plate.

3. The battery pack of claim 2, wherein, The first connecting plate has multiple snap-fit ​​slots; One end of each of the first cooling plates is snapped into the corresponding snap-fit ​​slot to fix the plurality of first cooling plates relative to the housing.

4. The battery pack of claim 3, wherein Each of the aforementioned snap-fit ​​slots has a plurality of first through holes formed on its slot wall; The fastening assembly also includes a plurality of fasteners, each of which passes through a corresponding first through hole and is connected to one end of each first cooling plate.

5. The battery box according to any one of claims 2 to 4, characterized in that The fastening assembly further includes a second connecting plate, which is spaced apart from the first connecting plate and is fixedly connected to the housing. The other end of the plurality of first cooling plates is connected to the second connecting plate.

6. The battery pack of claim 5, wherein, The second connecting plate has multiple clearance holes; One end of each of the first cooling plates passes through the clearance hole, so that the plurality of first cooling plates are connected to the second connecting plate.

7. The battery pack of any one of claims 1-4, wherein the battery pack is configured to be mounted to a vehicle. It also includes multiple connecting pipes, with at least one of the connecting pipes connecting two adjacent first cooling plates.

8. The battery pack of any one of claims 1-4, wherein, The enclosure includes: Base plate; Two second cooling plates are spaced apart on the base plate along the width direction of the base plate, and the two second cooling plates are used to cool the battery module; Two end plates are spaced apart on the base plate along the length of the base plate; The base plate, the two second cooling plates, and the two end plates form the main cavity.

9. The battery pack of claim 8, wherein, The fastening assembly further includes a first connecting plate, which is fixedly connected between the two second cooling plates and spaced apart from one of the end plates to form a first spacer cavity, the first spacer cavity being configured to accommodate a control assembly; and / or, The fastening assembly further includes a second connecting plate, which is fixedly connected between the two second cooling plates and spaced apart from one of the end plates to form a second spacer cavity, which is configured to accommodate a cooling pipe.

10. The battery pack of claim 8, wherein, One of the two second cooling plates has an inlet and the other has an outlet. The two second cooling plates are connected through a plurality of first cooling plates to form a cooling circuit.

11. A battery pack, characterized by Includes the battery box as described in any one of claims 1-10.

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