High-voltage connector and battery pack

Abstract

The utility model provides a high-voltage connector and a battery pack. The high-pressure connector comprises a cooling part, a cooling part, a cooling part and a cooling part, a cavity for cooling liquid to flow is formed in the cooling part, and the cavity is communicated with a cooling liquid circulating pipeline; the copper bar is embedded in the cooling part, and the copper bar is provided with an external connecting end extending to the outside of the battery pack shell and a built-in end which is positioned in the battery pack shell and is used for connecting a busbar; at least part of the copper bar is located in the cavity, and heat transfer is formed between the cooling liquid in the cavity and the copper bar. According to the high-voltage connector provided by the utility model, through the arrangement of the cooling part and the cavity in the cooling part, when the copper bars are heated due to charging and discharging of the battery pack, the cooling liquid in the cavity can exchange heat with part of the copper bars to cool and dissipate heat of the copper bars, so that the working temperature of the high-voltage connector is reduced, and the safety of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a high-voltage connector. The utility model also relates to a battery pack provided with the high-voltage connector. Background Art

[0002] With the country's planning and support for the development of the new energy vehicle industry, the market share of new energy vehicles has continued to increase. At present, electric vehicles are the mainstream of new energy vehicles on the market. In order to increase the horsepower of electric vehicles, the battery pack will output a larger voltage and current to the motor. At the same time, in order to shorten the charging time of battery vehicles and improve consumers' driving experience, major manufacturers usually adopt high-power fast charging solutions, increase the charging voltage and charging current, and improve the charging power of the battery pack, thereby shortening the charging time of electric vehicles.

[0003] At present, during the charging and discharging process of the battery pack, a large current is input into each battery module in the battery pack through the high-voltage connector of the battery pack, or output from the battery pack to the motor and other electrical equipment of the electric vehicle. When the current flowing through the high-voltage connector is too large, the copper busbar in the high-voltage connector will generate a large amount of resistance heat, causing the temperature of the copper busbar itself to rise. When the temperature of the copper busbar is too high, it will not only cause the charging efficiency of the battery pack to decrease, but also cause damage to the high-voltage connector, and even cause the battery pack to catch fire due to high temperature, resulting in reduced safety of the battery pack. Utility Model Content

[0004] In view of this, the utility model aims to provide a high-voltage connector that can cool and dissipate heat from the copper busbar, thereby reducing the operating temperature of the high-voltage connector and improving the safety of the battery pack.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A high-voltage connector includes: a cooling part, in which a cavity for coolant to flow is formed, and the cavity is connected to a coolant circulation pipeline; a copper busbar, embedded in the cooling part, and having an external connection end extending to the outside of a battery pack shell, and an internal end located inside the battery pack shell for connecting to a busbar; at least a portion of the copper busbar is located in the cavity, and heat transfer is formed between the coolant in the cavity and the copper busbar.

[0007] Further, the copper bars are configured as two arranged at intervals in the height direction of the cooling part;

[0008] The cavity comprises a first cavity and a second cavity, and at least parts of the two copper bars are respectively located in the first cavity and the second cavity.

[0009] Furthermore, the cooling unit is provided with a water inlet pipe and a water outlet pipe connected to the coolant circulation pipeline.

[0010] The water inlet pipe branch forms two water inlet branches respectively connected to the first cavity and the second cavity, and the water outlet pipe branch forms two water outlet branches respectively connected to the first cavity and the second cavity.

[0011] Furthermore, the water inlet pipe and the water outlet pipe are connected to the liquid cooling plate in the battery pack shell, and the water inlet pipe and the water outlet pipe are connected to the coolant circulation pipeline through the flow channel in the liquid cooling plate.

[0012] Further, the cooling part includes an upper mold body, a middle mold body and a lower mold body;

[0013] Grooves are formed on two opposite sides of the upper mold body and the middle mold body, and on two opposite sides of the middle mold body and the lower mold body;

[0014] The upper mold body and the middle mold body are interlocked to form the first cavity, and the lower mold body and the middle mold body are interlocked to form the second cavity.

[0015] Furthermore, the cooling unit is sleeved in a mounting frame, and the cooling unit is fixed to the battery pack shell through the mounting frame.

[0016] Furthermore, the two built-in ends of the two copper bars are staggered in the extension direction of the copper bars.

[0017] Furthermore, each of the built-in ends is provided with a mounting hole for accommodating a connecting piece, and the bus is penetrated by the connecting piece and abuts against the built-in end.

[0018] Furthermore, the connecting member is a bolt.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] The high-voltage connector described in the utility model, through the arrangement of the cooling part and its internal cavity, when the copper busbar generates heat due to the charging and discharging of the battery pack, the coolant in the cavity can exchange heat with part of the copper busbar to cool and dissipate heat of the copper busbar, thereby reducing the operating temperature of the high-voltage connector and improving the safety of the battery pack.

[0021] By integrating two copper bars on a high-voltage connector, it is possible to facilitate the connection between the high-voltage connector and the power lines outside the battery pack. At the same time, the first cavity and the second cavity are provided to cool the two copper bars, thereby improving the cooling effect of each copper bar to a certain extent, thereby reducing the operating temperature of the high-voltage connector.

[0022] The arrangement of the liquid inlet and outlet pipes of each liquid inlet pipe machine facilitates the connection between the coolant circulation pipeline and the cooling part, while improving the smoothness of the coolant flowing between the cavities.

[0023] By connecting the water inlet pipe and the water outlet pipe to the flow channel in the liquid cooling plate, the coolant in the liquid cooling plate can circulate to the cooling part, reducing the use of pipelines in the battery pack, facilitating the connection of the coolant circulation pipeline with the cooling part, and reducing the risk of coolant leakage in the battery pack shell.

[0024] By configuring the cooling part as multiple separate mold bodies, the copper bar is sandwiched between the upper mold body and the middle mold body, and between the middle mold body and the lower mold body, thereby facilitating the installation of the copper bar compared to an installation method in which the copper bar is embedded in the cooling part.

[0025] By providing the mounting frame, the copper busbar and the cooling unit can be stably connected to the battery pack housing.

[0026] The staggered arrangement of the built-in ends of the two copper bars allows the copper bar to avoid the other copper bar, which can prevent the other built-in end from interfering with the connection operation of the busbar, so as to facilitate the connection of the busbar with the built-in ends of each copper bar.

[0027] The arrangement of the mounting hole on the built-in end can press the busbar tightly against the copper busbar, facilitate the connection operation between the busbar and the copper busbar, and improve the stability of the connection between the busbar and the built-in end.

[0028] The connecting piece is a bolt to realize the detachable connection between the busbar and the copper busbar, thereby facilitating the maintenance and repair of the high-voltage connector of this embodiment.

[0029] Another object of the present invention is to provide a battery pack, in which the high-voltage connector as described above is provided.

[0030] The battery pack and / or high-voltage connector described in the present invention have the same technical effects as those of the prior art, and will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0032] Figure 1 This is a schematic diagram of the overall structure of the high-voltage connector according to the first embodiment of the utility model;

[0033] Figure 2 This is a rear view of the high voltage connector according to the first embodiment of the utility model;

[0034] Figure 3 For the utility model Figure 2 A cross-sectional view at the position indicated by AA;

[0035] Figure 4 This is an exploded view of the cooling unit according to the first embodiment of the present utility model;

[0036] Description of reference numerals:

[0037] 1. Cooling unit; 1a. Upper mold body; 1b. Middle mold body; 1c. Lower mold body;

[0038] 101, water inlet pipe; 1011 water inlet branch pipe;

[0039] 102. water outlet pipe; 103. connecting part;

[0040] 2. Copper busbar; 201. External connection end; 202. Internal end; 203. Mounting hole;

[0041] 3. First cavity; 4. Second cavity;

[0042] 5. Installation frame; 501. Frame body; 502. Installation portion; 503. Reinforcing ribs. DETAILED DESCRIPTION

[0043] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0044] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0045] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0046] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0047] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0048] Embodiment 1

[0049] The high-voltage connector of this embodiment is used for charging and discharging the battery pack. The overall structure is as follows: Figure 1 , Figure 2 and Figure 3 As shown, the high voltage connector of this embodiment includes a cooling portion 1 and a copper bus 2 embedded in the cooling portion 1;

[0050] A cavity for the flow of coolant is formed inside the cooling part 1, and the cavity is connected to the coolant circulation pipeline. The copper busbar 2 has an external connection end 201 extending to the outside of the battery pack shell, and an internal end 202 located inside the battery pack shell for connecting to the busbar. At least part of the copper busbar 2 is in the cavity, so that heat transfer is formed between the coolant in the cavity and the copper busbar 2.

[0051] As described above, through the arrangement of the cooling part 1 and its internal cavity, when the copper busbar 2 generates heat due to charging and discharging of the battery pack, the coolant inside the cavity can exchange heat with part of the copper busbar 2 to cool and dissipate heat from the copper busbar 2, thereby reducing the operating temperature of the high-voltage connector and improving the safety of the battery pack.

[0052] Based on the above overall introduction, in this embodiment, Figure 3 As shown, the cavity in the cooling part 1 has a strip-shaped cavity structure due to the portion of the copper bar 2 located inside the cooling part 1, and the coolant in the cavity can cover part of the copper bar 2, thereby increasing the heat exchange area and further improving the cooling effect on the copper bar 2. At the same time, the volume of the strip-shaped cavity is limited, and while ensuring the cooling and heat dissipation effect, the circulation speed of the coolant can be increased to a certain extent.

[0053] Since the copper busbar 2 is a conductive component, in order to prevent leakage, the cooling part 1 of this embodiment can be made of insulating materials, such as conventional nylon, engineering plastics, etc. At the same time, the coolant can be an insulating coolant, such as mineral oil, methanol, fluorinated liquid, etc., to prevent leakage to the coolant circulation pipeline. In addition, in order to prevent leakage, the copper busbar 2 of this embodiment embedded in the cooling part 1 can be coated with an insulating film on the outside, which has a certain thermal conductivity and avoids leakage.

[0054] In addition, the coolant circulation pipeline of this embodiment is connected to the cooling device outside the battery pack, and the cooling device can supply coolant to the cavity of the cooling part 1 through the coolant circulation pipeline. The cooling part 1 of this embodiment is formed by a connecting part 103 on the side facing the external connection end 201 of the copper busbar 2. The connecting part 103 is a sheet-like structure formed by the extension of the cooling part 1 to the outside of the battery pack shell. At the same time, the connecting part 103 is configured to be located on two opposite sides of the external connection end 201. Through the setting of the connecting part 103, the external connection end 201 of the copper busbar 2 can be protected and it is convenient to connect the line connector for powering the vehicle. Of course, the connecting part 103 can also be formed by other structures, which can be used to connect to the line connector.

[0055] In this embodiment, if Figure 1 and Figure 3 As shown, the copper bars 2 are configured as two arranged at intervals in the height direction of the cooling part 1, and the cavity includes a first cavity 3 and a second cavity 4, and at least parts of the two copper bars 2 are respectively in the first cavity 3 and the second cavity 4. The two copper bars 2 serve as the positive and negative electrodes of the battery pack and are integrated on a high-voltage connector, which can facilitate the connection between the high-voltage connector and the power lines outside the battery pack. At the same time, the first cavity 3 and the second cavity 4 are provided, which can cool the two copper bars 2, thereby improving the cooling effect of each copper bar 2 to a certain extent, and then reducing the working temperature of the high-voltage connector.

[0056] In order to facilitate the connection between the first cavity 3 and the second cavity 4 and the cooling liquid circulation pipeline, the cooling part 1 of this embodiment is provided with a water inlet pipe 101 and a water outlet pipe 1011 connected to the cooling liquid circulation pipeline; 102, the water inlet pipe 101 branches to form two water inlet branches respectively connected to the first cavity 3 and the second cavity 4, and the water outlet pipe 1011 water inlet branch; 102 branches to form two water outlet branches respectively connected to the first cavity 3 and the second cavity 4, so as to facilitate the connection between the cooling liquid circulation pipeline and the cooling part 1, and at the same time improve the smoothness of the flow of the cooling liquid between the cavities.

[0057] Since the heat generated by each battery module inside the battery pack is relatively large, in order to ensure the normal operation of each battery module, a liquid cooling plate is usually provided inside the battery pack, and the liquid cooling plate is connected to the cooling liquid circulation pipeline to cool and dissipate heat for each battery module. Therefore, in order to further facilitate the connection of the cooling liquid circulation pipeline with the cooling unit 1, the water inlet pipe 101 and the water outlet pipe 1011 water inlet branch; 102 of this embodiment are connected to the liquid cooling plate in the battery pack shell, and the water inlet pipe 101 and the water outlet pipe 1011 water inlet branch; 102 are connected to the cooling liquid circulation pipeline through the flow channel in the liquid cooling plate. By connecting the water inlet pipe 101 and the water outlet pipe 1011 water inlet branch; 102 to the flow channel in the liquid cooling plate, the cooling liquid in the liquid cooling plate can circulate to the cooling unit 1, reducing the use of the pipeline in the battery pack, facilitating the connection of the cooling liquid circulation pipeline with the cooling unit 1, and reducing the risk of cooling liquid leakage in the battery pack shell. In a specific implementation, the liquid cooling plate may be integrated on the top wall or the bottom wall of the battery pack housing to improve the compactness of the battery pack.

[0058] In order to facilitate the installation of the copper bar 2 embedded in the cooling part 1, as shown in FIG. Figure 1 , Figure 3 and Figure 4 As shown, the cooling part 1 of this embodiment includes an upper mold body 1a, a middle mold body 1b and a lower mold body 1c. Grooves are formed on the two opposite sides of the upper mold body 1a and the middle mold body 1b, and on the two opposite sides of the middle mold body 1b and the lower mold body 1c. The upper mold body 1a and the middle mold body 1b are interlocked to form a first cavity 3, and the lower mold body 1c and the middle mold body 1b are interlocked to form a second cavity 4. It can be understood that by setting the cooling part 1 as a plurality of separate mold bodies, the copper bar 2 is sandwiched between the upper mold body 1a and the middle mold body 1b, and between the middle mold body 1b and the lower mold body 1c, so that compared with the installation method of embedding the copper bar 2 between the cooling part 1, it is easier to install the copper bar 2. In the specific implementation, in order to improve the sealing of the cooling part 1, each mold body is connected by gluing, and the glue used for bonding is coated on the contact surface of each mold body that is interlocked.

[0059] Since the copper busbar 2 is arranged to penetrate the battery pack shell, in order to facilitate the fixing of the copper busbar 2 and the cooling part 1 on the battery pack shell, the cooling part 1 of this embodiment is sleeved in the mounting frame 5, and the cooling part 1 is fixed to the battery pack shell through the mounting frame 5. Specifically, the mounting frame 5 includes a frame body 501, a mounting part 502, and a reinforcing rib 503 connected between the frame body 501 and the mounting part 502. The frame body 501 is sleeved on the cooling part 1 to increase the stability of each mold combination of the cooling part 1. The mounting part 502 can abut against the battery pack shell, and at the same time, a plurality of through holes are provided on the mounting part 502, and the through holes can accommodate a connecting member to fix the mounting part 502 to the battery pack shell. And the reinforcing rib 503 can improve the stability of the connection between the mounting part 502 and the frame body 501, thereby improving the structural strength of the mounting frame 5. Therefore, through the setting of the mounting frame 5, the copper busbar 2 and the cooling part 1 can be stably connected to the battery pack shell.

[0060] In this embodiment, since the two copper bars 2 are arranged at intervals in the height direction of the cooling part 1, and the built-in ends 202 of the two copper bars 2 need to be connected to the bus inside the battery pack. In order to facilitate the connection of the bus with the built-in ends 202 of each copper bar 2, the two built-in ends 202 of the two copper bars 2 of this embodiment are staggered in the extension direction of the copper bar 2. In the process of connecting the bus with any built-in end 202, the copper bar 2 located at the upper part of the cooling part 1 avoids the other copper bar 2 through the staggered arrangement of the built-in end 202, which can avoid the interference of the other built-in end 202 with the connection operation of the bus, so as to facilitate the connection of the bus with the built-in ends 202 of each copper bar 2.

[0061] It can be understood that the length of the copper bar 2 in the first cavity 3 is shorter, and the length of the copper bar 2 in the second cavity 4 is longer. When connecting the busbar, the copper bar 2 in the second cavity 4 is first connected to the busbar, which can avoid interference with the other built-in end 202, and then the busbar is connected to the other built-in end 202. Compared with the overlapping arrangement of the two built-in ends 202 in the height direction, it is conducive to the assembly arrangement of the busbar.

[0062] In order to facilitate the connection between the busbar and the copper busbar 2, each built-in end 202 of this embodiment is provided with a mounting hole 203 for accommodating a connector, and the busbar is penetrated by the connector and abuts against the built-in end 202. Through the coordinated arrangement of the mounting hole 203 and the connector, the busbar can be pressed against the copper busbar 2, which can facilitate the connection operation between the busbar and the copper busbar 2 and improve the stability of the connection between the busbar and the built-in end 202.

[0063] Specifically, the connecting piece of the present embodiment is a bolt to realize the detachable connection between the busbar and the copper busbar 2, thereby facilitating the maintenance and repair of the high-voltage connector of the present embodiment.

[0064] In summary, the high-voltage connector of this embodiment, through the arrangement of the cooling part 1 and its internal cavity, when the copper bus 2 generates heat due to the charging and discharging of the battery pack, the coolant inside the cavity can exchange heat with part of the copper bus 2, thereby cooling the copper bus 2 and dissipating the heat, so as to reduce the operating temperature of the high-voltage connector, thereby improving the safety of the battery pack and having good practicality.

[0065] Embodiment 2

[0066] This embodiment relates to a battery pack, in which the high-voltage connector as described in the first embodiment is provided.

[0067] The battery pack of this embodiment is provided with a high-voltage connector, which can reduce the working stability of the high-voltage connector when the battery pack is charged and discharged, ensure the normal operation of the battery pack, and improve the safety performance of the battery pack.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high voltage connector, characterized in that: include: A cooling part, wherein a cavity is formed in the cooling part for cooling liquid to flow, and the cavity is connected to a cooling liquid circulation pipeline; A copper busbar, embedded in the cooling portion, and having an external connection end extending to the outside of the battery pack housing, and an internal end located inside the battery pack housing for connecting to a busbar; At least a portion of the copper bar is located in the cavity, and heat transfer is formed between the cooling liquid in the cavity and the copper bar.

2. The high voltage connector according to claim 1, characterized in that: The copper bars are configured as two copper bars arranged at intervals in the height direction of the cooling unit; The cavity comprises a first cavity and a second cavity, and at least parts of the two copper bars are respectively located in the first cavity and the second cavity.

3. The high voltage connector according to claim 2, characterized in that: The cooling unit is provided with a water inlet pipe and a water outlet pipe connected to the coolant circulation pipeline. The water inlet pipe branch forms two water inlet branches respectively connected to the first cavity and the second cavity, and the water outlet pipe branch forms two water outlet branches respectively connected to the first cavity and the second cavity.

4. The high voltage connector according to claim 3, characterized in that: The water inlet pipe and the water outlet pipe are in communication with the liquid cooling plate in the battery pack shell, and the water inlet pipe and the water outlet pipe are connected to the coolant circulation pipeline through the flow channel in the liquid cooling plate.

5. The high voltage connector according to claim 3, characterized in that: The cooling part includes an upper mold body, a middle mold body and a lower mold body; Grooves are formed on two opposite sides of the upper mold body and the middle mold body, and on two opposite sides of the middle mold body and the lower mold body; The upper mold body and the middle mold body are interlocked to form the first cavity, and the lower mold body and the middle mold body are interlocked to form the second cavity.

6. The high voltage connector according to claim 1, characterized in that: The cooling unit is sleeved in the mounting frame, and the cooling unit is fixed on the battery pack shell through the mounting frame.

7. The high voltage connector according to claim 2, characterized in that: The two built-in ends of the two copper bars are staggered in the extension direction of the copper bars.

8. The high voltage connector according to claim 7, characterized in that: Each of the built-in ends is provided with a mounting hole for accommodating a connecting piece, and the busbar is penetrated by the connecting piece and abuts against the built-in end.

9. The high voltage connector according to claim 8, characterized in that: The connecting piece is a bolt.

10. A battery pack, characterized in that: The battery pack is provided with a high-voltage connector according to any one of claims 1 to 9.

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