Battery box body and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery box and a battery pack, the battery box comprises a box frame and liquid cooling plates, the box frame comprises two end plates, two side plates and a bottom plate, the two end plates and the two side plates surround to form a frame body, the frame body is mounted on the bottom plate, a plurality of liquid cooling plates are mounted in the box frame, and the liquid cooling plates are mounted on the bottom plate. The liquid cooling plate comprises a cooling plate body and plugs arranged at the two ends of the cooling plate body, and the plugs are arranged opposite to the side plates and fixedly connected with the side plates. Wherein the cold plate body and the plug are fixedly connected through friction welding or tungsten electrode inert gas shielded welding. According to the utility model, the liquid cooling plate and the plug are connected in a friction stir welding or tungsten electrode inert gas shielded welding manner, so that the plug and the liquid cooling plate are tightly and seamlessly connected, the leakage of a cooling medium in the liquid cooling plate can be effectively prevented, and the air tightness passing rate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery box and a battery pack. Background Art

[0002] Battery cases and packs protect and contain the battery pack, typically consisting of several individual cells, a case, a battery management system, and related mounting components. Their design and material selection directly impact the performance and safety of electric vehicles. By continuously optimizing the design and manufacturing processes of battery cases and packs, we can effectively improve the range and overall performance of electric vehicles while ensuring safety and stability in various driving environments.

[0003] In the existing technology, most battery boxes and battery packs' liquid cooling plates and plugs are welded by brazing, laser welding or arc welding. These welding methods lead to poor production consistency, long processing time and reduced airtightness pass rate. Utility Model Content

[0004] The main purpose of the present utility model is to provide a battery box and a battery pack, aiming to improve the problem in the prior art that the liquid cooling plates and plugs of the battery box and the battery pack are brazed, laser welded or arc welded, resulting in long processing time and low yield rate of air tightness detection.

[0005] In order to achieve the above-mentioned utility model object, the first aspect of the utility model proposes:

[0006] A battery box, comprising a box frame and a liquid cooling plate, wherein the box frame comprises two end plates, two side plates and a bottom plate, wherein the two end plates and the two side plates surround each other to form a frame, wherein the frame is mounted on the bottom plate, and wherein a plurality of liquid cooling plates are mounted inside the box frame, wherein the liquid cooling plate comprises a cold plate body and plugs disposed at both ends of the cold plate body, wherein the plugs are disposed relative to the side plates and are fixedly connected to the side plates;

[0007] Wherein, the cold plate body and the plug are fixedly connected by friction welding or tungsten inert gas shielded welding;

[0008] As a further description of the above technical solution:

[0009] The cold plate body is connected to the bottom plate by spot welding, and a sealant is applied between the bottom plate and the cold plate body;

[0010] As a further description of the above technical solution:

[0011] The outer sides of the two side panels are fixedly connected with a profile frame having a cavity;

[0012] As a further description of the above technical solution:

[0013] The profile frame is provided with a recessed portion cut toward one side of the side panel, with exposed openings formed on both sides of the recessed portion, and a blocking member is provided at the opening to seal the opening;

[0014] As a further description of the above technical solution:

[0015] The plug is fixedly connected to the side plate via a connecting plate;

[0016] As a further description of the above technical solution:

[0017] The connecting plate includes a strip plate and a connecting plate, one end of the connecting plate is fixedly connected to the side plate, and the other end is fixedly connected to the strip plate; the strip plate is fixedly connected to the plug;

[0018] As a further description of the above technical solution:

[0019] The connecting plate is provided with a reinforcement structure;

[0020] As a further description of the above technical solution:

[0021] Each of the plugs corresponds to two connecting plates; the strip plates of the two connecting plates are arranged on both sides of the plug to clamp the plug;

[0022] As a further description of the above technical solution:

[0023] The plug is provided with a first through hole, and the strip plate is provided with a second through hole;

[0024] The first through hole and the second through hole are opposite to each other, and the plug and the strip plate are fixed by inserting bolts into the first through hole and the second through hole;

[0025] As a further description of the above technical solution:

[0026] A battery pack comprises the battery box described in any one of the above items, wherein a stacking body is provided between every two liquid cooling plates.

[0027] Beneficial effects:

[0028] In this utility model, the liquid cooling plate and plug are connected via friction stir welding or tungsten inert gas welding, resulting in a tight and seamless connection between the plug and the liquid cooling plate. This effectively prevents leakage of the cooling medium within the liquid cooling plate and improves airtightness. Furthermore, connecting the liquid cooling plate and plug via friction stir welding or tungsten inert gas welding can improve production consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1This is a three-dimensional schematic diagram of the battery box proposed in the utility model;

[0030] Figure 2 This is a schematic diagram of the structure of the battery pack proposed in this utility model;

[0031] Figure 3 This is a schematic diagram of the structure of the battery pack proposed in this utility model;

[0032] Figure 4 for Figure 1 Enlarged view of point A in the middle.

[0033] Figure 5 This is a schematic diagram of the structure of the battery box proposed in this utility model;

[0034] Figure 6 This is a schematic diagram of the structure of the liquid cooling plate proposed in the present invention;

[0035] in:

[0036] 1 - box frame; 101 - bottom plate; 102 - end plate; 103 - side plate; 2 - liquid cooling plate; 201 - cooling plate body; 3 - strip plate; 4 - plug; 5 - profile frame; 501 - recessed portion; 502 - opening; 6 - first through hole; 7 - bolt; 8 - connecting plate; 9 - stacking body.

[0037] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of the aforementioned features. In the description of the present invention, "multiple" means two or more, unless otherwise expressly and specifically defined.

[0040] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "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, direct connections, or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0041] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0042] refer to Figures 1 to 6 The present invention adopts a battery box according to an embodiment, comprising a box frame 1 and a liquid cooling plate 2. The box frame 1 comprises two end plates 102, two side plates 103 and a bottom plate 101. The two end plates 102 and the two side plates 103 are surrounded to form a frame, which is mounted on the bottom plate 101. A plurality of liquid cooling plates 2 are mounted inside the box frame 1. The liquid cooling plate 2 comprises a cold plate body 201 and plugs 4 arranged at both ends of the cold plate body 201. The plugs 4 are arranged opposite to the side plates 103 and are fixedly connected to the side plates 103.

[0043] The cold plate body 201 and the plug 4 are fixedly connected by friction welding or tungsten inert gas shielded welding;

[0044] Optionally, the liquid cooling plate 2 specifically includes a cold plate body 201 and plugs 4 disposed at both ends of the cold plate body 201. The plugs 4 are disposed relative to the side plates 103 and are fixedly connected to the side plates 103. The fixed connection between the cold plate body 201 and the plugs 4 is achieved by friction welding or tungsten inert gas welding. Friction welding utilizes the heat generated by friction between the contact surfaces of the workpieces as a heat source, causing the workpieces to plastically deform under pressure. This welding method offers high welding quality and high efficiency, resulting in a more secure connection between the cold plate body 201 and the plugs 4. Tungsten inert gas welding, on the other hand, utilizes arc heat generated between a tungsten electrode and the workpiece under the protection of an inert gas to melt the base material and filler wire. It offers advantages such as a stable welding process, high weld quality, and a wide range of applications. It also effectively achieves a reliable connection between the cold plate body 201 and the plugs 4, ensuring that the liquid cooling plate 2 performs its liquid cooling function within the battery case and providing a suitable temperature environment for normal battery operation.

[0045] refer to Figure 1 、 Figure 2 and Figure 6 The cold plate body 201 and the bottom plate 101 are connected by spot welding, and a sealant is applied between the bottom plate 101 and the cold plate body 201.

[0046] Optionally, the cold plate body 201 and the base plate 101 are connected by spot welding. Spot welding is an efficient and commonly used welding method that connects the cold plate body 201 and the base plate 101 by forming individual welding spots on the contact surface of the weldment. This connection method can not only ensure a certain connection strength, but also has the advantages of relatively simple operation and fast welding speed. Furthermore, because the top surface of the base plate 101 is a larger surface structure with limited flatness, if the base plate 101 is fully welded to the base plate 101, it will further affect the flatness of the base plate and cannot ensure the fit between the cold plate body 201 and the base plate. Therefore, the present application adopts spot welding for welding, and at the same time, a sealant is applied between the base plate 101 and the cold plate body 201. The sealant has good sealing performance. It can fill the tiny gap between the base plate 101 and the cold plate body 201 to prevent the leakage of substances such as liquids or gases, thereby ensuring the stability and safety of the internal environment of the battery box. Applying sealant can also play a role in buffering and shock absorption to a certain extent, reducing the impact of external vibration and other factors on the connection between the cold plate body 201 and the base plate 101, extending the service life of the battery box, ensuring that the battery operates in a good working environment, and improving the reliability and stability of the entire battery system.

[0047] refer to Figure 1 , the outer sides of the two side panels 103 are fixedly connected with the profile frame 5 of the cavity;

[0048] Optionally, in the structural design of the battery case, the outer sides of the two side panels 103 are fixedly connected to a profile frame 5 with a cavity. On the one hand, the cavity can reduce the overall weight of the profile frame 5, thereby reducing the weight of the entire battery case, which is very important for some application scenarios with strict requirements on weight, and helps to improve energy utilization efficiency and overall performance. On the other hand, the cavity structure can also increase the strength and rigidity of the profile frame 5, so that it can better withstand external pressure and impact force, and protect the components inside the battery case from damage. At the same time, this fixed connection method ensures the firmness of the connection between the profile frame 5 and the side panel 103, provides a more stable structural support for the battery case, and ensures the reliability and safety of the battery case in various working environments. In one embodiment, the side panel 103 on the same side is integrally formed with the profile frame 5 to improve production efficiency and structural strength.

[0049] refer to Figure 2 and Figure 5 , the profile frame 5 is provided with a recessed portion 501 cut toward one side of the side panel 103, and exposed openings 502 are formed on both sides of the recessed portion 501. A blocking object is provided at the opening 502 to seal the opening 502;

[0050] Optionally, on the side facing the side, the profile frame 5 is processed through a precise cutting process to form a specific recessed portion 501. The provision of the recessed portion 501 can further reduce the weight.

[0051] In order to ensure the stability and safety of the internal environment of the battery box, blocking objects are specially set at these openings 502. When the blocking objects are installed at the openings 502, the openings 502 can be effectively sealed to prevent external dust, water vapor, impurities and other substances from entering the interior of the profile frame 5.

[0052] refer to Figures 1 to 3 , the plug 4 is fixedly connected to the side plate 103 through a connecting plate;

[0053] Optionally, the stability and reliability of the connection are increased, so that the plug 4 and the side plate 103 can be firmly combined together, effectively preventing the connection between the plug 4 and the side plate 103 from loosening or separating due to factors such as vibration and impact during the operation of the battery box. Moreover, it also provides convenience for installation and maintenance to a certain extent. Furthermore, the plug 4 and the side plate 103 are fixedly connected by the connecting plate, which can also make up for the disadvantage of the weak connection strength between the liquid cooling plate 2 and the box frame 1 that exists when the cold plate body 201 and the bottom plate 101 are connected by spot welding.

[0054] refer to Figure 1 and Figure 4The connecting plate includes a strip plate 3 and a connecting plate 8, one end of the connecting plate 8 is fixedly connected to the side plate 103, and the other end is fixedly connected to the strip plate 3; the strip plate 3 is fixedly connected to the plug 4;

[0055] Optionally, by fixedly connecting the strip plate 3 to the plug 4 and the adapter plate 8 to the side plate 103, the plug 4 and side plate 103 are tightly combined together to ensure the integrity of the battery case structure. During operation, regardless of vibration, impact, or other external forces, the relative position of the plug 4 and side plate 103 can be maintained stable, preventing the two from separating, ensuring the stability of the internal structure of the battery case, and thus providing a stable environment for normal operation of the battery. In one embodiment, the strip plate 3 and adapter plate 8 are integrally formed sheet metal parts, improving production efficiency and structural strength.

[0056] refer to Figure 1 、 Figure 3 and Figure 5 , a reinforcement structure is provided on the connecting plate 8;

[0057] Optionally, the connecting plate 8, a key component connecting the side panels 103 and the strip panels 3, is subject to forces from various directions. The provision of a reinforcement structure can significantly improve the connecting plate 8's resistance to bending, torsion, and compression, making it less susceptible to deformation or damage under complex loads. For example, when the battery case is subjected to external impact or vibration, the reinforcement structure can effectively resist these forces, ensuring that the connecting plate 8 maintains its shape and functional integrity, thereby maintaining the stability of the connection between the plug 4 and the side panels 103.

[0058] refer to Figure 3 , each plug 4 corresponds to two connecting plates; the strip plates 3 of the two connecting plates are arranged on both sides of the plug 4 to clamp the plug 4;

[0059] Optionally, two connecting plates clamp the plug 4 from both sides, providing a more stable fixation. Compared to a single connection point or a single-sided connection, double-sided clamping can better resist external forces from different directions, preventing the plug 4 from shifting or loosening due to vibration, impact, or other external forces during battery box operation. This stable connection ensures that the liquid cooling plate 2 is fixed in place within the box frame 1, ensuring the normal operation of the liquid cooling system, thereby providing continuous and effective cooling for the batteries.

[0060] refer to Figure 1 、 Figure 3 and Figure 6 , a first through hole 6 is provided on the plug 4, and a second through hole is provided on the strip plate 3;

[0061] The first through hole 6 and the second through hole are opposite to each other, and the plug 4 and the strip plate 3 are fixed by inserting the bolts 7 into the first through hole 6 and the second through hole;

[0062] Optionally, bolt connection 7 is a common and reliable mechanical connection method. By inserting bolt 7 into the opposing first and second through-holes 6 and tightening them, a strong clamping force is generated between the plug 4 and the strip plate 3, tightly securing the two together. This connection method can withstand large forces such as tension, shear, and torque, effectively preventing loosening or separation between the plug 4 and the strip plate 3 under various operating conditions of the battery case, ensuring the stability of the connection between the liquid cooling plate 2 and the case frame 1 and providing reliable protection for the normal operation of the battery.

[0063] refer to Figures 1 to 2 , a battery pack, comprising the battery box of any one of the above embodiments, wherein a stacking body 9 is provided between every two liquid cooling plates 2;

[0064] Optionally, a battery pack combines multiple battery cells together to form a larger capacity energy storage unit.

[0065] Working Principle: First, sealant is used at the bottom of multiple liquid cooling plates 2 to connect them to the chassis frame 1, forming a closed cavity. This cavity effectively isolates the high-temperature smoke generated during thermal runaway, preventing the runaway of one stack 9 from spreading to adjacent stacks 9, thereby significantly improving the system's safety and protection.

[0066] Secondly, glue sealing technology is used to seal the internal cavity of the box profile frame 5. Through the aluminum profile of the profile frame 5 itself and the structure of hollowing out the interior of the profile frame 5, it not only reduces the cost but also reduces its own weight. In addition, the opening 502 of the profile frame 5 is sealed with glue sealing technology, so that foreign matter can be prevented from entering.

[0067] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery box, comprising a box frame and a liquid cooling plate, wherein the box frame comprises two end plates, two side plates, and a bottom plate, wherein the two end plates and the two side plates surround a frame, the frame being mounted on the bottom plate, and a plurality of liquid cooling plates being mounted inside the box frame, characterized in that: The liquid cooling plate includes a cooling plate body and plugs provided at both ends of the cooling plate body, wherein the plugs are provided relative to the side plates and are fixedly connected to the side plates; Wherein, the cold plate body and the plug are fixedly connected by friction welding or tungsten inert gas shielded welding.

2. The battery box according to claim 1, characterized in that: The cold plate body is connected to the bottom plate by spot welding, and sealant is applied between the bottom plate and the cold plate body.

3. The battery box according to claim 1, characterized in that: The outer sides of the two side panels are fixedly connected with a profile frame of the cavity.

4. The battery case according to claim 3, wherein: The profile frame is provided with a recessed portion cut toward one side of the side panel, with exposed openings formed on both sides of the recessed portion, and blocking objects are provided at the openings to seal the openings.

5. The battery case according to claim 1, wherein: The plug is fixedly connected to the side plate via a connecting plate.

6. The battery case according to claim 5, characterized in that: The connecting plate includes a strip plate and a connecting plate, one end of the connecting plate is fixedly connected to the side plate, and the other end is fixedly connected to the strip plate; the strip plate is fixedly connected to the plug.

7. The battery case according to claim 6, characterized in that: A reinforcement structure is provided on the connecting plate.

8. The battery case according to claim 6, characterized in that: Each of the plugs corresponds to two connecting plates; the strip plates of the two connecting plates are arranged on both sides of the plug to clamp the plug.

9. The battery case according to claim 8, characterized in that: The plug is provided with a first through hole, and the strip plate is provided with a second through hole; The first through hole and the second through hole are opposite to each other, and the plug and the strip plate are fixed by inserting bolts into the first through hole and the second through hole.

10. A battery pack, characterized in that: The battery box comprises the battery box according to any one of claims 1 to 9, wherein a stacking body is provided between every two liquid cooling plates.

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