Battery pack and electric device

Abstract

The utility model provides a battery pack and an electric device, and relates to the technical field of batteries. The cold plate comprises a plate body part and an extension part which are connected with each other, the plate body part is arranged at the bottom of the box body frame, and the extension part extends out of one side of the box body frame and is provided with a medium inlet and a medium outlet; the current collector comprises a medium inlet channel communicated with the medium inlet and a medium outlet channel communicated with the medium outlet; an inlet of the medium inlet channel is formed in one side of an inlet of the medium outlet channel. The bottom protection plate is mounted on the cold plate; the threaded connection assembly comprises a first mounting hole formed in the bottom protection plate; the threaded insert is embedded in the current collector, and an internal threaded hole is formed in the threaded insert; the second mounting hole is formed in the current collector; and one part of the first threaded connecting piece can penetrate through the first mounting hole and is screwed into the inner threaded hole from the second mounting hole. According to the embodiment, the risks of battery pack water inflow, cold plate corrosion liquid leakage, function failure and the like are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, specifically, relate to a battery pack and electric device. BACKGROUND

[0002] The battery pack is usually provided with a cooling module for cooling the battery module, and the cooling module usually comprises a cold plate and a connector, which are connected with the box frame and the bottom guard plate. In the related scheme, after the cold plate and the connector are installed, the part of the cold plate located outside the box frame has low strength and is easy to be damaged, which leads to high risk of cold plate damage and may cause a series of problems such as water entering the battery pack, cold plate corrosion and leakage, and functional failure.

[0003] Therefore, how to propose a battery pack with a cold plate that is not easy to be damaged has become a problem to be solved at present. UTILITY MODEL CONTENTS

[0004] The utility model aims at least to solve the technical problem that the cold plate of the battery pack in the prior art or related art is easy to be damaged.

[0005] Therefore, the first aspect of the utility model provides a battery pack.

[0006] The second aspect of the utility model also provides an electric device.

[0007] According to the first aspect of the utility model, a battery pack is provided, which comprises: a box frame; a cold plate comprising a plate body part and an extension part connected with each other, the plate body part is arranged at the bottom of the box frame, the extension part extends from the plate body part to the side of the box frame and extends to the outside of the box frame, the extension part is provided with a medium inlet and a medium outlet; a current collector arranged on the upper surface of the extension part, the current collector comprises a medium inlet channel communicated with the medium inlet and a medium outlet channel communicated with the medium outlet, the inlet of the medium inlet channel is arranged on one side of the inlet of the medium outlet channel along the height direction of the box frame; a bottom guard plate installed at the bottom of the cold plate; at least one threaded connection assembly for connecting the bottom guard plate and the current collector, the threaded connection assembly comprises: a first mounting hole arranged on the bottom guard plate; at least one threaded insert embedded in the current collector, the threaded insert is provided with an internal thread hole; a second mounting hole arranged on the current collector and communicated with the internal thread hole; a first threaded connecting piece, a part of the first threaded connecting piece can pass through the first mounting hole and is screwed into the internal thread hole from the second mounting hole to connect the bottom guard plate and the current collector.

[0008] The utility model discloses a battery pack, including box frame, cold plate and current collector. Cold plate is the core component of realizing battery heat management, and its whole is composed of two parts: one part is the plate body part directly pasted with the bottom of box frame, and the other part is the extension part that stretches out from the side of box frame. The plate body part is contacted with the bottom of battery pack, and the heat generated during battery operation is conducted to itself, or the heat is taken away through internal medium flow, and the heat dissipation or heating effect is achieved. The extension part stretches out from the outside of box frame, and its function is to lead the internal flow channel interface of cold plate to the outside of box frame, so as to be connected with the external cooling system. The upper surface of extension part is provided with two key interfaces, i. e. medium inlet and medium outlet, which are respectively used for the inflow and outflow of heat exchange medium. Two independent channels are processed in the current collector: the medium inlet channel is communicated with the medium inlet of extension part, and is responsible for leading the heat exchange medium of external cooling system; the medium outlet channel is communicated with the medium outlet of extension part, and is responsible for leading the heat exchange medium after heat exchange to the external system. The inlet of medium inlet channel (i. e. the position of heat exchange medium entering medium inlet channel) is arranged on one side of the inlet of medium outlet channel (i. e. the position of heat exchange medium entering medium outlet channel) along the height direction of box frame.

[0009] The battery pack can be used for vehicles and the like, and provides power source for vehicles and the like. The box frame is the basic support structure of the whole battery pack, and is mainly used for fixing and protecting the internal battery module and other components, and provides mechanical strength and installation basis for the battery pack. The current collector is a flow guide component arranged on the upper surface of the extension part, and is mainly used for connecting the external heat exchange system and the cold plate.

[0010] By arranging the medium inlet channel and the medium outlet channel in the height direction, the physical separation of the medium inlet channel and the medium outlet channel in the height direction is realized. The separation design makes the low-temperature heat exchange medium of the medium inlet channel and the high-temperature heat exchange medium of the medium outlet channel not easy to interfere with each other, and the heat absorbed by the plate body part can be more concentratedly taken away by the heat exchange medium of the medium inlet channel. In addition, after arranging the medium inlet channel and the medium outlet channel in the height direction, the transverse dimension of the extension part does not need to reserve extra space for the left and right side-by-side flow channels. On the one hand, this reduces the area of the part of the cold plate that is outside the box frame (i. e. the extension part) in the width direction, increases the height of the current collector, and thus helps to improve the strength of the extension part and the current collector, and reduces the risk of damage to the cold plate. This reduces the risk of water entering the battery pack, corrosion of the cold plate, leakage and functional failure of the battery pack caused by damage to the cold plate.

[0011] In the technical solution, the battery pack further comprises a bottom guard plate for protecting the cold plate and a threaded connection assembly connecting the bottom guard plate and the current collector. The bottom guard plate is installed at the bottom of the cold plate. The threaded connection assembly specifically includes four parts: a first mounting hole is provided on the bottom guard plate to provide a passing path for the first threaded connecting piece; a threaded insert is pre-embedded in the current collector, and an internal threaded hole is processed on the threaded insert for threaded cooperation with the first threaded connecting piece; a second mounting hole penetrates through the upper surface and the interior of the current collector and is in communication with the internal threaded hole of the threaded insert to form a channel for the first threaded connecting piece to pass through; and the first threaded connecting piece (such as a bolt) passes through the first mounting hole of the bottom guard plate at one end and is screwed into the internal threaded hole of the threaded insert through the second mounting hole of the current collector at the other end, and finally fastens and connects the bottom guard plate and the current collector.

[0012] The bottom guard plate mainly functions to block external foreign matter impact, liquid penetration or dust accumulation, avoid damage or corrosion of the cold plate directly exposed to the external environment, and ensure stable heat exchange function.

[0013] In the embodiment, the threaded insert serves as a reinforcing structure pre-embedded in the current collector and is directly combined with the current collector as a whole. When the first threaded connecting piece is screwed, the fastening force is dispersed to the current collector through the threaded insert, avoiding local stress concentration caused by tapping on the current collector (mostly made of aluminum alloy or other materials with low strength). This design significantly enhances the strength and durability of the threaded connection between the current collector and the bottom guard plate, effectively prevents the current collector from slipping or the threaded damage caused by excessive stress, and thus improves the sealing reliability and service life of the connection between the two. In addition, the threaded insert wraps the first threaded connecting piece inside the current collector, so that the first threaded connecting piece is less exposed to the external environment, reducing the risk of deformation of the first threaded connecting piece caused by collision or scratching, and avoiding the corrosion of corrosive media such as rainwater and salt mist on the bolt. This protection mechanism reduces the probability of loosening of the first threaded connecting piece caused by external factors, further ensuring the stability of the connection between the current collector and the bottom guard plate, maintaining good sealing performance in long-term use, and prolonging the structural reliability period of the battery pack as a whole.

[0014] In any of the above technical solutions, optionally, the inlet of the medium inlet channel is arranged above the inlet of the medium outlet channel along the height direction of the box frame.

[0015] In the technical solutions, the inlet of the medium inlet channel of the current collector is arranged above the inlet of the medium outlet channel along the height direction of the box frame, i.e. the current collector part on the upper surface of the extension part. The starting position of the medium inlet channel for introducing the heat exchange medium is higher than the starting position of the medium outlet channel for leading out the heat exchange medium. This structure can make the structural layout of the entire flow channel more reasonable.

[0016] In any of the above technical solutions, optionally, the current collector includes a first portion and a second portion connected to each other, the first portion covers the upper surface of the extension portion, and the second portion protrudes from the edge of the extension portion; the second mounting hole and the at least one threaded insert are embedded in the second portion, and the at least one threaded connection assembly is used to connect the bottom guard plate and the current collector.

[0017] In the technical solutions, the current collector includes a first portion and a second portion connected to each other, the first portion covers the upper surface of the extension portion, and the second portion protrudes from the edge of the extension portion. Among them, the first portion plays a major role in bearing and strengthening by covering the entire upper surface of the extension portion, directly improving the compression resistance and impact resistance of the lower extension portion, and the second portion, by protruding from the contour boundary of the extension portion, the first portion and the second portion together constitute a stable structure with a larger support area, further strengthening the overall rigidity and reliability of the joint between the current collector and the extension portion.

[0018] It should be noted that the first portion and the second portion of the current collector are only distinguished in the description level, and are actually a whole structure, not two independent components formed by physical division.

[0019] At the same time, the threaded insert is embedded in the second portion, so that the fastening points of the current collector and the bottom guard plate are arranged in the second portion, the second mounting hole penetrates the second portion and communicates with the threaded hole in the threaded insert, and the first threaded connection (such as a bolt) completes the fastening of the bottom guard plate and the current collector through this path. The design of this independent fastening point completely avoids the mechanical connection path from passing through the cold plate area, and there is no need to open a hole for the bolt to pass through on the cold plate. On the contrary, if a hole is opened on the cold plate, the structural strength of the cold plate may be weakened, and even a weak point is formed at the sealing place to cause leakage of the heat exchange medium; avoiding the threaded connection assembly from being arranged on the cold plate preserves the integrity of the cold plate, avoids the loss of strength of the cold plate, reduces the risk of leakage of the cold plate, and effectively improves the overall strength and reliability of the cold plate.

[0020] In any of the above technical solutions, optionally, the extension portion extends from a first side of the box frame to the outside of the box frame, the extension direction of the first side is a first direction; the second portion includes a first protruding portion and a second protruding portion located on both sides of the first portion along the first direction, the number of the first threaded connection is at least two, at least one of the at least two first threaded connections connects the first protruding portion and the bottom guard plate, and at least another of the at least two first threaded connections connects the second protruding portion and the bottom guard plate.

[0021] In the technical solutions, the extension part of the cold plate protrudes outward from the first side of the box frame, and the extension direction of the first side is defined as the first direction (e.g., the length or width direction of the box frame). The current collector is divided into two parts: the first part completely covers the upper surface of the extension part, and the second part protrudes from the edge of the first part in the first direction to form a first protruding part and a second protruding part. The first protruding part and the second protruding part are respectively located on both sides of the first part in the first direction, and are consistent with the extension direction of the extension part.

[0022] The first threaded connection for connecting the bottom guard plate and the current collector includes at least two first threaded connections. One of the first threaded connections has a first mounting hole that is arranged at a position corresponding to the first protruding part of the bottom guard plate, penetrates through the bottom guard plate, and is screwed into the internal threaded hole of the internal threaded insert through the second mounting hole of the first protruding part of the current collector, thereby fastening the first protruding part and the bottom guard plate. The other first threaded connection is arranged at a position corresponding to the second protruding part of the bottom guard plate, and connects the second protruding part and the bottom guard plate in the same way.

[0023] The design of the double-sided protruding parts cooperating with at least two threaded connections enables the connection points of the current collector and the bottom guard plate to be symmetrically distributed on both sides of the extension part. When the bottom guard plate is subjected to external loads (such as vibration during vehicle driving or stone impact), the fixing force is uniformly transmitted to the first protruding part and the second protruding part of the current collector through the two symmetric connection points, and then is dispersed to the areas on both sides of the extension part. Compared with the scheme of arranging the connection points only on one side, the design avoids the generation of torque or stress concentration at the joint between the extension part and the current collector due to excessive force on one side, and reduces the risk of local deformation or debonding. At the same time, the symmetric layout improves the assembly consistency, and only the corresponding position of the two sides needs to be fixed with a bolt during installation, thereby reducing the problem of loose connection caused by assembly deviation. Overall, the design significantly enhances the connection stability and structural strength of the current collector and the extension part of the cold plate at the mounting position of the box frame through bilateral symmetric connection, thereby ensuring the reliability of the battery pack during long-term use.

[0024] In any of the above technical solutions, the battery pack further includes a sealing gasket arranged between the bottom guard plate and the current collector, or a sealing adhesive arranged between the bottom guard plate and the current collector.

[0025] In the technical solutions, the battery pack further comprises a sealing gasket or a sealing glue. The sealing gasket or the sealing glue is used to seal the gap between the bottom protection plate and the current collector. The sealing gasket is arranged between the bottom protection plate and the second part of the current collector, and a through hole is arranged on the sealing gasket to pass through the first threaded connecting piece, or the sealing gasket is arranged directly to avoid the first threaded connecting piece. When the bottom protection plate and the current collector are locked through the first threaded connecting piece, the sealing gasket is compressed to fill the joint gap, or the sealing glue is cured to fill the joint gap, so as to form an effective sealing barrier at the connecting interface of the bottom protection plate and the current collector, prevent external moisture, dust and other pollutants from entering the inside of the battery pack, and improve the sealing protection level and use safety of the battery pack.

[0026] In any of the above technical solutions, the battery pack further comprises a bracket, the bracket is mounted on the box frame and connected to the current collector through at least one second threaded connecting piece, or the current collector is welded to the box frame.

[0027] In the technical solutions, the bracket and the second threaded connecting piece cooperate to provide a detachable fastening mode, and the upper part of the current collector is reliably fixed on the box frame, or the welding connection forms a permanent and firm combination. This structure not only connects the bottom of the current collector to the bottom protection plate, but also reliably fixes the current collector to the box frame, thereby limiting the displacement and vibration of the current collector in multiple directions, enhancing the connection stiffness and overall stability of the current collector and the extension part of the cold plate below the current collector at the box frame, and reducing the risk of connection failure caused by vibration fatigue.

[0028] In any of the above technical solutions, when the battery pack comprises the bracket, the bracket is mounted on the side of the current collector away from the cold plate.

[0029] In the technical solutions, the pressing force direction of the bracket on the current collector is opposite to the direction of the extension part of the cold plate bearing external force, an effective constraint is formed, the positioning stability of the current collector in the height direction is enhanced, and the external load acting on the current collector is directly transmitted to the box frame through the bracket, avoiding the extension part of the cold plate bearing force alone, thereby further optimizing the stress path and improving the anti-vibration and anti-impact performance of the connection between the current collector and the cold plate.

[0030] When the current collector is welded to the box frame, the current collector is welded to the box frame in the form of arc welding.

[0031] In any of the above technical solutions, the plate body part is welded to the current collector, and / or the plate body part is welded to the box frame.

[0032] In the technical solutions, the plate body part is connected with the current collector by welding (such as brazing). The plate body part is connected with the box frame by welding, for example, the plate body part is connected with the box frame by friction stir welding.

[0033] In the embodiment, the welding of the plate body part and the current collector realizes permanent and firm combination between the cold plate and the current collector, ensures structural strength and sealing reliability of the connection, and the welding of the plate body part and the box frame directly fixes the cold plate on the box frame, thereby enhancing installation stability of the cold plate in the box frame; the welding connection mode provides an interface with high strength and excellent sealing performance, effectively prevents loosening of the connection under vibration or impact, and reduces the risk of leakage of the heat exchange medium at the connection interface, thereby significantly improving durability and safety of the battery pack thermal management system.

[0034] For example, the box frame is provided with a positioning structure, and the edge of the plate body part is installed on the box frame through the positioning structure.

[0035] For example, the box frame is provided with a clamping groove, the edge of the plate body part is clamped into the clamping groove and connected with the box frame by welding, for example, the plate body part is connected with the box frame by friction stir welding.

[0036] According to the second aspect of the utility model, a power utilization device is further provided, which comprises: the battery pack provided in any of the above embodiments.

[0037] The power utilization device provided by the second aspect of the utility model has all the beneficial effects of the battery pack.

[0038] The additional aspects and advantages of the utility model will become apparent from the following description, or be understood through practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0039] The above and / or additional aspects and advantages of the utility model will become apparent and more readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0040] Figure 1 Fig. 1 shows a partial structure schematic view of a battery pack according to an embodiment of the utility model;

[0041] Figure 2 Fig. 2 shows a partial structure schematic view of a battery pack according to another embodiment of the utility model; Figure 1 Fig. 3 shows an enlarged structure schematic view of part A in Fig. 2;

[0042] Figure 3 Fig. 4 shows a partial structure schematic view of a battery pack according to another embodiment of the utility model;

[0043] Figure 4Part structure schematic view three of the battery pack of one embodiment of the utility model shows,

[0044] Figure 5 Part structure schematic view four of the battery pack of one embodiment of the utility model shows, Figure 4 Partial enlarged structure schematic view of B in middle,

[0045] Figure 6 Part structure schematic view four of the battery pack of one embodiment of the utility model shows,

[0046] Figure 7 Structure schematic view of the battery pack of one embodiment of the utility model shows,

[0047] Figure 8 Structure schematic view of the vehicle of one embodiment of the utility model shows.

[0048] Wherein, Figures 1 to 8 The correspondence between the reference signs and the component names in the drawings is as follows:

[0049] 100 battery pack, 1 box frame, 12 first side, 2 cold plate, 20 medium outlet, 22 medium inlet, 24 plate body part, 26 extension part, 262 upper surface, 3 current collector, 30 medium discharge channel, 32 medium inlet channel, 34 first part, 36 second part, 362 first protruding part, 364 second protruding part, 366 second mounting hole, 4 bottom guard plate, 42 first mounting hole, 5 first threaded connecting piece, 6 threaded insert, 62 internal thread hole, 72 sealing gasket, 74 sealing glue, 8 support, 9 second threaded connecting piece, 10 battery upper cover, 11 battery pack, 200 controller, 300 motor. DETAILED DESCRIPTION

[0050] In order to enable the above-mentioned purpose, features and advantages of the utility model to be more clearly understood, the utility model will be further described in detail below in combination with the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0051] In the following description, a lot of specific details are set forth in order to facilitate a thorough understanding of the utility model, however, the utility model can also be implemented in other ways different from the description herein, therefore, the protection scope of the utility model is not limited by the specific embodiments disclosed below.

[0052] The following refers to Figures 1 to 8 The battery pack 100 and the electric device according to some embodiments of the utility model are described.

[0053] In the related scheme, the joint (current collector) and the connecting position of the cold plate 2 and the joint are externally arranged behind the box frame, the strength of the part of the cold plate 2 outside the box frame is low and is easy to be damaged. Meanwhile, the connecting bolt of the cold plate 2 and the bottom guard plate is exposed and is easy to be damaged.

[0054] To solve the above technical problems, the embodiment provides a battery pack 100, which comprises a box frame 1, a current collector 3 and a cold plate 2 for cooling, at least one medium outlet 20 and a medium inlet 22 are arranged on the cold plate 2, a plate body part 24 of the cold plate 2 is installed at the bottom of the box frame 1 and is covered by the box frame 1, the cold plate 2 further comprises an extension part 26, the extension part 26 extends from one side of the box frame 1 to the outside of the box frame 1. The current collector 3 is arranged on the upper surface 262 of the extension part 26, two independent channels are processed in the current collector 3, the medium inlet channel 32 is connected with the medium inlet 22 of the extension part 26 and is responsible for introducing the heat exchange medium of the external cooling system, and the medium discharge channel 30 is connected with the medium outlet 20 of the extension part 26 and is responsible for discharging the heat exchange medium after heat exchange to the external system. Meanwhile, the current collector 3 and the bottom guard plate 4 of the battery pack 100 are connected through bolts, and a threaded insert 6 for fixing the bolt is arranged in the current collector 3. The current collector 3 and the bottom guard plate 4 are sealed through sealing glue 74 and a sealing gasket 72.

[0055] In the embodiment, the current collector 3 is externally arranged in the box frame 1, and the structure of the whole product is optimized. Meanwhile, the medium inlet channel 32 and the medium discharge channel 30 are arranged in the height direction, and the physical separation of the medium inlet channel 32 and the medium discharge channel 30 in the height direction is realized. After the medium inlet channel 32 and the medium discharge channel 30 are arranged in the height direction, the transverse size of the extension part 26 does not need to reserve extra space for the left and right parallel flow channels, which on the one hand reduces the area of the extension part 26 and increases the height of the current collector 3, thereby helping to improve the strength of the extension part 26 and the current collector 3, thereby reducing the risk of damage of the cold plate 2, preventing the battery pack 100 from entering water, the cold plate 2 from corroding and leaking and the function from failing.

[0056] The battery pack in the embodiment can be a power battery pack, and the power battery pack can be specifically used in a new energy automobile or an oil-electric hybrid automobile.

[0057] The current collector 3 is also called a joint, which is a structure for connecting the liquid path between the inlet and outlet water pipes of the heat exchange medium containing box and the cold plate 2. The box frame 1 is a bottom bearing structure of the battery pack 100, which is used for supporting and installing the battery pack 11 and the cold plate 2 and the like. The plate body part 24 and the extension part 26 are an integrated structure.

[0058] The battery pack can be used for a power consumption device using a battery as a power source. The battery pack can also be used for various energy storage devices using a battery as an energy storage element. The power consumption device includes, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, such as a game machine, an electric automobile toy, an electric ship toy, and an electric aircraft toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0059] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , according to the first aspect of the present application, a battery pack 100 is provided, which includes a box frame 1, a cold plate 2, and a current collector 3. The cold plate 2 is the core component for realizing battery thermal management, which is composed of two parts: one part is a plate body part 24 directly attached to the bottom of the box frame 1, and the other part is an extension part 26 extending outward from one side of the box frame 1. The plate body part 24 conducts the heat generated by the battery operation to itself by contacting the bottom of the battery pack 100, or carries away the heat by internal medium flow, playing a role of heat dissipation or heating; the extension part 26 extends from the outside of the box frame 1, which is to lead the internal flow channel interface of the cold plate 2 out to the outside of the box, facilitating connection with the external cooling system. The upper surface 262 of the extension part 26 is provided with two key interfaces, namely the medium inlet 22 and the medium outlet 20, which are respectively used for the inflow and outflow of the heat exchange medium. The current collector 3 is internally processed with two independent channels: the medium inlet channel 32 is connected with the medium inlet 22 of the extension part 26, responsible for leading the heat exchange medium of the external cooling system; the medium outlet channel 30 is connected with the medium outlet 20 of the extension part 26, responsible for leading the heat exchange medium after heat exchange out to the external system. Among them, the inlet of the medium inlet channel 32 (i.e. the position of the heat exchange medium into the medium inlet channel 32) is arranged on one side of the inlet of the medium outlet channel 30 (i.e. the position of the heat exchange medium into the medium outlet channel 30) along the height direction of the box frame 1.

[0060] Among them, the battery pack 100 can be used for vehicles and the like, providing power source for vehicles and the like. The box frame 1 is the basic support structure of the whole battery pack 100, mainly used for fixing and protecting the internal battery module and other components, providing mechanical strength and installation basis for the battery pack 100. The current collector 3 is a flow guide component arranged on the upper surface 262 of the extension part 26, which is mainly used for connecting the external heat exchange system and the cold plate 2.

[0061] By arranging the medium inlet channel 32 and the medium outlet channel 30 in an up-down manner along the height direction, the physical separation of the medium inlet channel 32 and the medium outlet channel 30 in the height direction is achieved. This separation design makes the low-temperature heat exchange medium of the medium inlet channel 32 and the high-temperature heat exchange medium of the medium outlet channel 30 less likely to interfere with each other, and the heat absorbed by the plate body part 24 can be more concentratedly taken away by the heat exchange medium of the medium inlet channel 32. In addition, after arranging the medium inlet channel 32 and the medium outlet channel 30 in an up-down manner along the height direction, the transverse dimension of the extension part 26 does not need to reserve extra space for the left-right parallel flow channels. This way, on the one hand, the area of the part of the cold plate 2 (i.e., the extension part 26) that is externally arranged on the outside of the box frame 1 in the width direction (such as the first direction in FIG. 1) is reduced, and the height of the current collector 3 is increased, thereby helping to improve the strength of the extension part 26 and the current collector 3 and reducing the risk of damage to the cold plate 2. This way, the risk of water entering the battery pack 100, the cold plate 2 corroding and leaking, and the cold plate 2 failing to function due to damage to the cold plate 2 is reduced as a whole. Figure 2

[0062] In any of the above embodiments, optionally, as shown in Figure 1 , Figure 2 , Figure 4 and Figure 5 , along the height direction of the box frame 1, the inlet of the medium inlet channel 32 is arranged above the inlet of the medium outlet channel 30.

[0063] In these embodiments, the inlet of the medium inlet channel 32 of the current collector 3 is arranged above the inlet of the medium outlet channel 30 along the height direction of the box frame 1, i.e., the part of the current collector 3 on the upper surface 262 of the extension part 26. The starting position of the medium inlet channel 32 for introducing the heat exchange medium is higher than the starting position of the medium outlet channel 30 for leading out the heat exchange medium. This structure can make the overall flow channel structure more reasonable.

[0064] In any of the above embodiments, optionally, as shown in Figure 1 , Figure 2 , Figure 4 and Figure 5 ​As shown, the battery pack 100 further comprises a bottom guard plate 4 for protecting the cold plate 2 and at least one threaded connection assembly connecting the bottom guard plate 4 and the current collector 3. The bottom guard plate 4 is installed at the bottom of the cold plate 2. The threaded connection assembly specifically includes four parts: a first mounting hole 42 provided on the bottom guard plate 4 to provide a passing path for the first threaded connecting piece 5; a threaded insert 6 pre-embedded inside the current collector 3, which is processed with an internal threaded hole 62 for threaded cooperation with the first threaded connecting piece 5; a second mounting hole 366 penetrating the upper surface 262 and the inside of the current collector 3, which is in communication with the internal threaded hole 62 of the threaded insert 6 to form a channel for the first threaded connecting piece 5 to pass through; and the first threaded connecting piece 5 (such as a bolt) passes through the first mounting hole 42 of the bottom guard plate 4 at one end and is screwed into the internal threaded hole 62 of the threaded insert 6 through the second mounting hole 366 of the current collector 3 at the other end, finally fastening and connecting the bottom guard plate 4 and the current collector 3.

[0065] The bottom guard plate 4 mainly plays a role in blocking external foreign matter impact, liquid penetration or dust accumulation, avoiding the cold plate 2 from being damaged or corroded by being directly exposed to the external environment, and ensuring the stability of its heat exchange function.

[0066] In this embodiment, the threaded insert 6 serves as a reinforcing structure pre-embedded in the current collector 3 and is directly combined with the current collector 3 as a whole. When the first threaded connecting piece 5 is tightened, the fastening force is dispersed and transmitted to the current collector 3 through the threaded insert 6, avoiding the problem of local stress concentration caused by tapping threads directly on the current collector 3 (which is mostly made of aluminum alloy or other materials with low strength). This design significantly enhances the strength and durability of the threaded connection between the current collector 3 and the bottom guard plate 4, effectively preventing the current collector 3 from slipping or the threads from being damaged due to excessive stress, thereby improving the sealing reliability and service life of the connection between the two. In addition, the threaded insert 6 wraps the first threaded connecting piece 5 inside the current collector 3, allowing the first threaded connecting piece 5 to be less exposed to the external environment, reducing the risk of deformation of the first threaded connecting piece 5 caused by collision or scratching, and avoiding the corrosion of corrosive media such as rainwater and salt spray on the bolt. This protection mechanism reduces the probability of loosening of the first threaded connecting piece 5 caused by external factors, further ensuring the stability of the connection between the current collector 3 and the bottom guard plate 4, maintaining good sealing performance in long-term use, and prolonging the structural reliability period of the entire battery pack 100.

[0067] In any of the above embodiments, optionally, as Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, the current collector 3 comprises a first portion 34 and a second portion 36 connected to each other, the first portion 34 covers the upper surface 262 of the extension 26, and the second portion 36 protrudes from the edge of the extension 26. Among them, the first portion 34 plays a major role in bearing and strengthening by covering the entire upper surface 262 of the extension 26, directly improving the compression and impact resistance of the underlying extension 26, and the second portion 36 protrudes from the contour boundary of the extension 26, the first portion 34 and the second portion 36 together constitute a stable structure with a larger support area, further strengthening the overall rigidity and reliability of the junction between the current collector 3 and the extension 26.

[0068] It should be noted that the first portion 34 and the second portion 36 of the current collector 3 are only distinguished at the description level, and are actually a whole structure, not two independent components formed by physical division.

[0069] At the same time, the second mounting hole 366 and the threaded insert 6 are embedded in the second portion 36, so that the fastening points of the current collector 3 and the bottom guard plate 4 are arranged in the second portion 36, the second mounting hole 366 penetrates the second portion 36 and communicates with the threaded hole 62 in the threaded insert 6, and the first threaded connecting piece 5 (such as a bolt) completes the fastening of the bottom guard plate 4 and the current collector 3 through this path. The design of this independent fastening point completely avoids the mechanical connection path from passing through the cold plate 2 area, and there is no need to open a hole for the bolt to pass through on the cold plate 2. On the contrary, if a hole is opened on the cold plate 2, the structural strength of the cold plate 2 may be weakened, and even a weak point is formed at the sealing position to cause leakage of the heat exchange medium; and avoiding the threaded connecting assembly from being arranged on the cold plate 2 retains the integrity of the cold plate 2, which not only avoids the loss of strength of the cold plate 2, but also reduces the risk of leakage of the cold plate 2, effectively improving the overall strength and reliability of the cold plate 2.

[0070] In any of the above embodiments, optionally, as shown, Figures 1 to 6 The extension 26 protrudes from the first side 12 of the cabinet frame 1, and the extension direction of the first side 12 is the first direction; the second portion 36 comprises a first protruding portion 362 and a second protruding portion 364 located on both sides of the first portion 34 along the first direction, the number of the first threaded connecting pieces 5 is at least two, and at least one of the at least two first threaded connecting pieces 5 is connected to the first protruding portion 362 and the bottom guard plate 4, and at least another of the at least two first threaded connecting pieces 5 is connected to the second protruding portion 364 and the bottom guard plate 4.

[0071] In the embodiments, the extension 26 of the cold plate 2 protrudes outward from the first side 12 of the box frame 1, and the extension direction of the first side 12 is defined as the first direction (e.g., the length or width direction of the box frame 1). The current collector 3 is divided into two parts in whole: the first part 34 completely covers the upper surface 262 of the extension 26, and the second part 36 protrudes from the edge of the first part 34 in the first direction to form the first protruding part 362 and the second protruding part 364. Among them, the first protruding part 362 and the second protruding part 364 are respectively located on both sides of the first part 34 along the first direction, consistent with the extension direction of the extension 26.

[0072] The first threaded connecting piece 5 for connecting the bottom guard plate 4 and the current collector 3 is at least two: one of the first threaded connecting pieces 5 has a first mounting hole 42 opened at the position corresponding to the first protruding part 362 of the bottom guard plate 4, passes through the bottom guard plate 4, and then passes through the second mounting hole 366 of the first protruding part 362 of the current collector 3, and is screwed into the internal threaded hole 62 of the internal threaded insert 6 to fasten the first protruding part 362 and the bottom guard plate 4; the other first threaded connecting piece 5 is at the position corresponding to the second protruding part 364 of the bottom guard plate 4, and connects the second protruding part 364 and the bottom guard plate 4 in the same way.

[0073] The design of the double-sided protruding part cooperating with at least two threaded connecting pieces makes the connection points of the current collector 3 and the bottom guard plate 4 symmetrically distributed on both sides of the extension 26. When the bottom guard plate 4 is subjected to external load (such as vibration during vehicle driving, stone impact), the fixing force is uniformly transmitted to the first protruding part 362 and the second protruding part 364 of the current collector 3 through the two symmetric connection points, and then dispersed to the two side areas of the extension 26. Compared with the scheme of arranging the connection point only on one side, the torque or stress concentration at the joint of the extension 26 and the current collector 3 caused by excessive force on one side is avoided, and the risk of local deformation or debonding is reduced. At the same time, the symmetrical layout improves the assembly consistency, and only the corresponding position of the two sides needs to be fixed during installation, reducing the problem of loose connection caused by assembly deviation. Overall, this design significantly enhances the connection stability and structural strength of the current collector 3 and the extension 26 of the cold plate 2 at the installation position of the box frame 1, ensuring the reliability of the battery pack 100 during long-term use.

[0074] In any of the above embodiments, the battery pack 100 further comprises a sealing gasket 72 arranged between the bottom guard plate 4 and the current collector 3, as shown in Figures 1 to 3 or as shown in Figure 4 and Figure 5 the battery pack 100 further comprises a sealing glue 74 arranged between the bottom guard plate 4 and the current collector 3.

[0075] In the embodiments, the battery pack 100 further comprises a sealing gasket 72 or a sealing glue 74 for sealing the gap between the bottom protective plate 4 and the current collector 3. The sealing gasket 72 or the sealing glue 74 is arranged between the bottom protective plate 4 and the second portion 36 of the current collector 3 and avoids the first threaded connecting piece 5. When the bottom protective plate 4 and the current collector 3 are locked through the first threaded connecting piece 5, the sealing gasket 72 is pressed to fill the joint gap, or the sealing glue 74 is cured to fill the joint gap, thereby forming an effective sealing barrier at the connecting interface of the bottom protective plate 4 and the current collector 3 to prevent external moisture, dust and other pollutants from entering the inside of the battery pack 100, thereby improving the sealing protection level and use safety of the battery pack 100.

[0076] In any of the above embodiments, optionally, as shown in Figure 4 and Figure 5 , the battery pack 100 further comprises a bracket 8 mounted on the box frame 1, and the bracket 8 is connected with the current collector 3 through at least one second threaded connecting piece 9; or, the current collector 3 is directly connected with the box frame 1 through welding; the cooperation of the bracket 8 and the second threaded connecting piece 9 provides a detachable fastening mode to reliably fix the upper position of the current collector 3 on the box frame 1, or the welding connection forms a permanent firm combination.

[0077] This structure makes the current collector 3 reliably fixed with the box frame 1 in addition to being connected with the bottom protective plate 4 at the bottom, thereby limiting the displacement and vibration of the current collector 3 in multiple directions, enhancing the connecting rigidity and overall stability of the current collector 3 and the extension part 26 of the cold plate 2 below at the box frame 1, and reducing the risk of connection failure caused by vibration fatigue.

[0078] In any of the above embodiments, optionally, as shown in Figure 4 and Figure 5 , when the battery pack 100 comprises the bracket 8, the bracket 8 is mounted on the side of the current collector 3 away from the cold plate 2; the bracket 8 covers and presses the current collector 3 from above, and the current collector 3 is fixed on the box frame 1 from above through the at least one second threaded connecting piece 9.

[0079] This structure makes the pressing force direction of the bracket 8 on the current collector 3 opposite to the direction of the extension part 26 of the cold plate 2 bearing external force, forms an effective constraint, enhances the positioning stability of the current collector 3 in the height direction, and directly transmits the external load possibly acting on the current collector 3 to the box frame 1 through the bracket 8, thereby avoiding the extension part 26 of the cold plate 2 bearing force alone, further optimizing the stress path, and improving the anti-vibration and anti-impact performance of the connection between the current collector 3 and the cold plate 2.

[0080] In the welding connection between the current collector 3 and the box frame 1, the current collector 3 is welded with the box frame 1 in the form of arc welding.

[0081] In any of the above embodiments, optionally, the plate body part 24 is welded to the current collector 3, and / or the plate body part 24 is welded to the box frame 1.

[0082] In these embodiments, the plate body part 24 is welded (e.g., brazed) to the current collector 3. The plate body part 24 is welded to the box frame 1, for example, the plate body part 24 is welded to the box frame 1 in the form of friction stir welding.

[0083] In the present embodiment, the welding of the plate body part 24 to the current collector 3 achieves a permanent and firm combination between the cold plate 2 and the current collector 3, ensuring the structural strength and sealing reliability of the connection, and the welding of the plate body part 24 to the box frame 1 directly fixes the cold plate 2 to the box frame 1, enhancing the installation stability of the cold plate 2 in the box frame 1; the welding connection provides a high-strength and excellent sealing interface, effectively preventing the connection from loosening under vibration or impact, and reducing the risk of leakage of the heat exchange medium at the connection interface, thereby significantly improving the durability and safety of the battery pack thermal management system.

[0084] Illustratively, the box frame 1 is provided with a positioning structure, and the edge of the plate body part 24 is installed on the box frame 1 through the positioning structure.

[0085] Illustratively, the box frame 1 is provided with a clamping groove, and the edge of the plate body part 24 is installed in the clamping groove and welded to the box frame 1, for example, the plate body part 24 is welded to the box frame 1 in the form of friction stir welding.

[0086] The specific structure of the battery pack 100 can be as shown in Figure 7 .

[0087] According to the second aspect of the present application, a power utilization device is also provided, which comprises the battery pack according to any of the above embodiments, and the battery pack is used to provide electric energy.

[0088] The power utilization device provided by the second aspect of the present application has all the beneficial effects of the battery pack.

[0089] Optionally, the power utilization device can be a vehicle (the structure of the vehicle is as shown in Figure 8As shown in the figure, the vehicle can be a fuel car, a gas car, or a new energy car, and the new energy car can be a pure electric car, a hybrid car, or an extended-range car. The vehicle is internally provided with a battery pack 100, which includes a battery upper cover 10, a battery pack 11, and a box frame 1, etc. The battery upper cover 10 and the box frame 1 form a closed cavity to accommodate the battery pack 11 and other parts. The battery pack 100 can be arranged at the bottom, head or tail of the vehicle. The battery pack 100 can be used for power supply of the vehicle, for example, the battery pack 100 can be used as the operating power source of the vehicle. The vehicle can also include a controller 200 and a motor 300, which can be used to control the battery pack 100 to supply power to the motor 300, so that the vehicle starts and runs, and the controller 200 can also be used to control the battery pack 100 for other working power requirements of the vehicle. Here, the working power requirement can refer to the battery pack 100 providing power to the lighting system and other power components of the vehicle.

[0090] The following describes the battery pack 100 in a specific embodiment.

[0091] As shown in the figure, the vehicle can be a fuel car, a gas car, or a new energy car, and the new energy car can be a pure electric car, a hybrid car, or an extended-range car. The vehicle is internally provided with a battery pack 100, which includes a battery upper cover 10, a battery pack 11, and a box frame 1, etc. The battery upper cover 10 and the box frame 1 form a closed cavity to accommodate the battery pack 11 and other parts. The battery pack 100 can be arranged at the bottom, head or tail of the vehicle. The battery pack 100 can be used for power supply of the vehicle, for example, the battery pack 100 can be used as the operating power source of the vehicle. The vehicle can also include a controller 200 and a motor 300, which can be used to control the battery pack 100 to supply power to the motor 300, so that the vehicle starts and runs, and the controller 200 can also be used to control the battery pack 100 for other working power requirements of the vehicle. Here, the working power requirement can refer to the battery pack 100 providing power to the lighting system and other power components of the vehicle. Figures 1 to 6 As shown in the figure, the vehicle can be a fuel car, a gas car, or a new energy car, and the new energy car can be a pure electric car, a hybrid car, or an extended-range car. The vehicle is internally provided with a battery pack 100, which includes a battery upper cover 10, a battery pack 11, and a box frame 1, etc. The battery upper cover 10 and the box frame 1 form a closed cavity to accommodate the battery pack 11 and other parts. The battery pack 100 can be arranged at the bottom, head or tail of the vehicle. The battery pack 100 can be used for power supply of the vehicle, for example, the battery pack 100 can be used as the operating power source of the vehicle. The vehicle can also include a controller 200 and a motor 300, which can be used to control the battery pack 100 to supply power to the motor 300, so that the vehicle starts and runs, and the controller 200 can also be used to control the battery pack 100 for other working power requirements of the vehicle. Here, the working power requirement can refer to the battery pack 100 providing power to the lighting system and other power components of the vehicle.

[0092] To solve the above problems, the battery pack 100 of the embodiment specifically includes: a cold plate; a connector (current collector 3) arranged on the cold plate and having a liquid inlet channel (medium inlet channel 32) and a liquid outlet channel (medium outlet channel 30) in communication with the internal flow channel of the cold plate; and a box frame 1 having a frame surrounding the cold plate. The bottom of the frame is provided with a clamping groove for fitting the edge part of the cold plate. The frame corresponding to one side of the connector is provided with a plug-in slot for plugging part of the connector and implementing welding.

[0093] In this embodiment, the connector is designed as a structure with an embedded steel wire sleeve, and is connected with the cold plate body by brazing. The cold plate body is welded and connected with the box frame 1 by friction stir welding, and the connector is welded and connected with the box frame 1 by arc welding. The cold plate body and the connector are sealed by a sealing pad 72 between the cold plate body and the bottom guard plate 4, and the screw is locked in the embedded steel wire sleeve of the connector.

[0094] In another alternative embodiment, the battery pack 100 comprises: a cold plate; a joint provided on the cold plate and having a liquid inlet channel and a liquid outlet channel in communication with the internal flow channel of the cold plate; a box frame 1 having a frame provided around the cold plate, and the bottom of the frame is provided with a positioning structure for embedding the edge part of the cold plate; and a support 8 provided on the box frame 1 and welded with the box frame 1.

[0095] In this embodiment, the joint is also embedded with a steel wire sleeve and is connected with the cold plate body by brazing. The cold plate body is combined with the box frame 1 by friction stir welding, and is sealed by a sealing glue 74. The joint is connected with the support 8 by fasteners (the support 8 has been welded on the box frame 1). The cold plate body and the joint are sealed with the bottom guard plate 4 by the sealing glue 74, and the screws are locked in the steel wire sleeve embedded in the joint.

[0096] The battery pack 100 provided in this embodiment has the following beneficial effects: no exposed fasteners, enhancing the anti-external force and corrosion resistance; no thin-walled cold plate body part exposed, improving the ability to resist external forces; using sealing gaskets 72 or sealing glue 74 for sealing, improving the protection reliability; at the same time, the joint and the box frame 1 are connected by locking (in the second embodiment), which improves the overall strength of the battery pack 100 and improves the maintainability.

[0097] The inside of the battery pack 100 is usually cooled by a cooling module for cooling the battery pack 11, and the cooling module usually comprises a cold plate body and a joint. After the cold plate body and the joint are connected, they are connected with the box frame 1 and the bottom guard plate 4, involving multiple interfaces, and the connection mode between the interfaces is easy to fail. The connection mode fails, the sealing fails, and the battery pack 100 is easy to enter water, the cold plate is easy to corrode and leak, the insulation and pressure resistance fail, and the function of the cold plate fails.

[0098] To solve the above problems, the present embodiment provides a battery pack 100 comprising a cold plate, a joint and a box frame 1. The joint is provided on the cold plate and has a medium inlet channel and a liquid outlet channel in communication with the flow channel of the cold plate 2. The box frame 1 has a frame provided around the cold plate, and the bottom of the frame is provided with a clamping groove for embedding the edge part of the cold plate. The frame corresponding to one side of the joint is provided with a plug-in slot for plugging part of the joint.

[0099] In this embodiment, the joint is designed to be embedded with a steel wire sleeve and connected with the cold plate body by brazing. The cold plate body is welded with the box frame 1 in the form of friction stir welding, and the joint is welded with the box frame 1 in the form of arc welding. The cold plate body and the joint are sealed with the bottom guard plate 4 in the form of a sealing gasket 72, and the screws are locked in the steel wire sleeve embedded in the joint.

[0100] The battery pack 100 in another embodiment comprises a cold plate, a joint and a box frame 1, the joint is arranged on the cold plate and has a medium inlet channel and a liquid outlet channel in communication with the flow channel of the cold plate 2, and the box frame 1 has a frame arranged around the cold plate and the bottom of the frame is provided with a positioning arrangement for fitting the edge part of the cold plate. The battery pack 100 further comprises a support 8 arranged on the box frame 1 and welded with the box frame 1.

[0101] The joint is designed in the form of an embedded steel wire sleeve structure and is connected with the cold plate body by brazing, the cold plate body is connected with the box frame 1 in the form of friction stir welding, the joint is connected with the support 8 by a fastener (the support 8 is welded on the box frame 1), the cold plate body, the joint and the bottom guard plate 4 are kept sealed in the form of sealing glue 74, and the screw is locked in the embedded steel wire sleeve of the joint.

[0102] According to the battery pack 100 of the embodiment, no fastener is exposed, the anti-external force and corrosion resistance are enhanced, no thin-walled cold plate body is exposed, the anti-external force is enhanced, the sealing gasket 72 is sealed to improve the reliability, the maintainability is improved, the joint and the box frame 1 are locked to improve the overall strength of the battery pack 100.

[0103] In the present application, the term "a plurality of" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0104] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "a specific embodiment" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0105] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery pack, characterized in that, include: Box frame; The cold plate includes a plate body and an extension body connected to each other. The plate body is disposed at the bottom of the housing frame, and the extension body extends from the plate body to the side of the housing frame and extends to the outside of the housing frame. The extension body is provided with a medium inlet and a medium outlet. A current collector is disposed on the upper surface of the extension. The current collector includes a medium inlet channel communicating with the medium inlet and a medium outlet channel communicating with the medium outlet. The inlet of the medium inlet channel is disposed on one side of the inlet of the medium outlet channel along the height direction of the housing frame. A bottom protective plate is installed at the bottom of the cold plate; At least one threaded connection assembly for connecting the bottom protective plate and the manifold, the threaded connection assembly comprising: The first mounting hole is located on the bottom protective plate; At least one threaded insert is embedded in the current collector, and the threaded insert is provided with an internal threaded hole; The second mounting hole is provided on the current collector and communicates with the internal threaded hole; A first threaded connector, a portion of which can pass through the first mounting hole and be screwed into the internal threaded hole through the second mounting hole, to connect the bottom guard plate and the collector.

2. The battery pack according to claim 1, characterized in that, Along the height direction of the housing frame, the inlet of the medium inlet channel is located above the inlet of the medium outlet channel.

3. The battery pack according to claim 1, characterized in that, The current collector includes a first part and a second part that are connected to each other. The first part covers the upper surface of the extension and the second part protrudes from the edge of the extension. The second mounting hole and at least one of the threaded inserts are embedded in the second portion, and at least one threaded connection assembly is used to connect the bottom guard plate and the manifold.

4. The battery pack according to claim 3, characterized in that, The extension extends from the first side of the housing frame to the outside of the housing frame, and the extension direction of the first side is the first direction; The second part includes a first protrusion and a second protrusion located on both sides of the first part along the first direction. The number of the first threaded connectors is at least two. At least one of the at least two first threaded connectors connects the first protrusion and the bottom guard plate, and at least another of the at least two first threaded connectors connects the second protrusion and the bottom guard plate.

5. The battery pack according to claim 1, characterized in that, The battery pack also includes: A sealing gasket is disposed between the bottom protective plate and the current collector; or A sealant is applied between the bottom protective plate and the current collector.

6. The battery pack according to any one of claims 1 to 5, characterized in that, The battery pack also includes a bracket, which is mounted on the housing frame and connected to the current collector via at least one second threaded connector; or The current collector is welded to the housing frame.

7. The battery pack according to claim 6, characterized in that, When the battery pack includes a bracket, the bracket is mounted on the side of the current collector facing away from the cold plate.

8. The battery pack according to any one of claims 1 to 5, characterized in that, The plate body is welded to the current collector, and / or the plate body is welded to the box frame.

9. An electrical device, characterized in that, Includes a battery pack as described in any one of claims 1 to 8, the battery pack being used to provide electrical energy.

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