Power distribution unit of power battery, power battery and vehicle

Abstract

The utility model discloses a power distribution unit of a power battery, the power battery and a vehicle, the power distribution unit comprises a shell with a containing cavity, and the containing cavity is provided with an opening; the relay is arranged in the containing cavity and comprises a bottom edge, a first side edge, a second side edge, a third side edge and a fourth side edge, the first side edge, the second side edge, the third side edge and the fourth side edge are sequentially arranged in the circumferential direction, at least one of the side edges adheres to the opposite cavity wall of the containing cavity, and the bottom edge adheres to the cavity bottom of the containing cavity. As the relay is bonded with the shell and the bonding glue has curing time, the relay is connected with the conductive busbar during bonding, and the connection part of the contact of the relay and the conductive busbar can be adjusted by using the activity of the bonding glue when the bonding glue is not cured; therefore, the problem that the connection part of the contact of the relay and the conductive busbar is stressed due to a size gap generated by superposition of manufacturing tolerances is solved, the problem that the connection part of the contact of the relay and the conductive busbar is loosened due to stress and the contact area is reduced is solved, and the problem that the working temperature of the relay exceeds a threshold value is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of power battery, especially a power battery distribution unit, a power battery and a vehicle. BACKGROUND

[0002] At present, the relay of the power distribution unit is electrically connected with the conductive busbar through bolts to form a loop. However, both the relay and the conductive busbar have manufacturing tolerances in the manufacturing process, and the size gap caused by the superposition of the manufacturing tolerances will cause stress at the connection between the relay and the conductive busbar after the connection.

[0003] When the power distribution unit is subjected to vibration or impact during use, the stress at the connection between the relay and the conductive busbar will be released, causing the connection between the relay and the conductive busbar to separate under stress, reducing the contact area between the relay and the conductive busbar, and further increasing the contact resistance between the relay and the conductive busbar, which leads to an increase in the temperature of the conductive busbar and even exceeds the threshold, ultimately resulting in failure of the power distribution unit.

[0004] Therefore, how to provide a power battery distribution unit to reduce the connection stress between the relay and the conductive busbar is a technical problem that needs to be solved by those skilled in the art. UTILITY MODEL CONTENTS

[0005] In view of the above problems, the utility model provides a power battery distribution unit to reduce the connection stress between the relay and the conductive busbar. In addition, the utility model also provides a power battery and a vehicle with the above-mentioned power battery distribution unit.

[0006] The specific scheme is as follows:

[0007] The utility model provides a power battery distribution unit in a first aspect, it includes: shell, the shell has accommodation cavity, the accommodation cavity has opening;Relay, the relay is arranged in the accommodation cavity, the relay includes bottom edge and first side edge, second side edge, third side edge and fourth side edge that are arranged in sequence along the circumference, wherein, at least one of the first side edge, the second side edge, the third side edge and the fourth side edge is bonded with the cavity wall opposite the accommodation cavity, the bottom edge is bonded with the cavity bottom of the accommodation cavity, and the cavity bottom of the accommodation cavity is opposite the opening of the accommodation cavity.

[0008] In a possible implementation, in the power battery distribution unit described above, at least two opposite side edges of the first side edge, the second side edge, the third side edge and the fourth side edge are bonded with the accommodation cavity.

[0009] In a possible implementation of the power battery distribution unit, the relay and the accommodating cavity are bonded by means of point gluing.

[0010] In a possible implementation of the power battery distribution unit, the relay and the accommodating cavity are bonded by means of epoxy glue or UV glue.

[0011] In a possible implementation of the power battery distribution unit, the relay is at least two, and the shell has the accommodating cavity corresponding to the relay.

[0012] In a possible implementation of the power battery distribution unit, the accommodating cavities of the shell are arranged side by side along a first direction.

[0013] In a possible implementation of the power battery distribution unit, the shell further comprises a shunt, and the shunt is arranged at one end of the shell along the first direction.

[0014] In a possible implementation of the power battery distribution unit, the shell further comprises a conductive busbar, and the contact of the relay is fixedly connected to the conductive busbar; and the conductive busbar is connected to the shell at a position close to the opening of the accommodating cavity.

[0015] In a possible implementation of the power battery distribution unit, the conductive busbar comprises a first busbar, a second busbar, and the first busbar is a U-shaped structure, one end of the first busbar is fixedly connected to the shell, and the other end of the first busbar is opposite to the opening of the accommodating cavity and is connected to the first contact of the relay; the second busbar is an L-shaped structure, one end of the second busbar is fixedly connected to the shell, and the other end of the second busbar is opposite to the opening of the accommodating cavity and is connected to the second contact of the relay.

[0016] The second aspect of the utility model provides a kind of power battery, including distribution unit, wherein the distribution unit is described in any one of the above distribution unit.

[0017] The third aspect of the utility model provides a kind of vehicle, including power battery, wherein the power battery is described in the above power battery.

[0018] By the above technical scheme, the utility model provides a kind of power battery distribution unit, relay and accommodating cavity are bonded.Because the accommodating cavity of relay and shell is bonded during bonding process, bonding glue has certain solidification time, therefore, the contact of relay is connected with conducting busbar when bonding, the contact of relay and the connecting place of conducting busbar can be adjusted using the activity of bonding glue when not solidified, to solve the problem that the contact of relay and the connecting place of conducting busbar are stressed due to the dimensional gap caused by manufacturing tolerance superposition, further solve the problem that the contact area is reduced due to the looseness of the contact of relay and the connecting place of conducting busbar, and then solve the problem that the working temperature of relay exceeds threshold value.

[0019] During the connection process of the contact of relay and conducting busbar, the bottom edge of relay is bonded and limited by the cavity bottom of accommodating cavity, which can avoid the problem of improper installation of relay in accommodating cavity.In addition, after the bonding glue used for bonding relay and accommodating cavity is solidified, the bottom edge of relay is fixed with the cavity bottom of accommodating cavity, and at least one side edge of relay is fixed with the corresponding side wall of accommodating cavity, which can ensure the stability of the connection between relay and accommodating cavity. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and other features, advantages, and aspects of the various embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numerals designate identical or similar elements. It is to be understood that the drawings are schematic, and the proportions of the elements and the sizes do not necessarily correspond to reality.

[0021] Figure 1 A partial structure exploded view of the power battery distribution unit provided by the utility model embodiment is shown in the figure.

[0022] Figure 2 A structure schematic view of the shell of the power battery distribution unit provided by the utility model embodiment is shown in the figure.

[0023] Figure 3 A structure schematic view of the relay of the power battery distribution unit provided by the utility model embodiment is shown in the figure.

[0024] Figure 4 A partial structure assembly drawing of the power battery distribution unit provided by the utility model embodiment is shown in the figure.

[0025] Among them,

[0026] 1-shell, 2-relay, 3-conducting busbar, 4-shunt, 5-threaded connecting piece.

[0027] 11-accommodating cavity, 21-first side edge, 22-second side edge, 23-third side edge, 24-fourth side edge, 25-bottom edge, 26-panel, 31-first busbar, 32-second busbar. DETAILED DESCRIPTION

[0028] The embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. The terms used in part of the embodiments of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0029] The embodiments of the present application will be described below in conjunction with the drawings. It is known to those skilled in the art that, with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems. It should be noted that, for the sake of description, only parts related to the present application are shown in the drawings. In the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0030] The terms "first", "second", and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, and this is only a distinguishing way used in describing the embodiments of the present application when describing objects with the same attributes. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, so that the process, method, system, product or equipment containing a series of units does not have to be limited to those units, but can include other units not clearly listed or inherent to these processes, methods, products or equipment.

[0031] The power battery is the core power element of the electric vehicle, and provides energy for driving the electric vehicle. The power battery is a complex system, and in the production process, it will go through multiple manufacturing processes and finally be assembled into a power battery. There are strict processing process requirements and process control requirements and offline inspection standards in each manufacturing process.

[0032] However, the processed power battery cannot be completely detected, so there is a small probability of defective products, which affects the quality of the power battery. Among them, the battery distribution unit (BDU) of the power battery and the whole vehicle is extremely important, and the stability and reliability of the electrical connection of the internal components of the battery distribution unit are particularly important.

[0033] At present, the relay of the battery distribution unit is electrically connected with the conductive busbar through bolts, so as to form a loop of the battery distribution unit. However, both the relay and the conductive busbar have manufacturing tolerances in the manufacturing process, and the manufacturing tolerances will produce size gaps. After the relay and the conductive busbar are connected, stress will exist at the connection between the contacts of the relay and the conductive busbar.

[0034] When the power distribution unit is subjected to vibration or impact during use, the stress at the connection between the relay and the conductive busbar is released, causing the connection between the relay and the conductive busbar to separate under stress, reducing the contact area of the relay and the conductive busbar, and further increasing the contact resistance of the relay and the conductive busbar, causing the temperature of the conductive busbar to rise and even exceed a threshold value, ultimately causing the power distribution unit to fail.

[0035] Based on the above technical problems, the power distribution unit of the power battery disclosed in the embodiments of the present application bonds the relay to the shell to ensure the fixation of the position of the relay on the shell, and the contact of the relay can be adjusted before the bonding glue solidifies during the bonding of the relay and the shell, thereby solving the problem of stress on the connection between the relay contact and the conductive busbar caused by the size gap due to the accumulation of manufacturing tolerances, solving the problem of reduced contact area caused by the loosening of the connection between the relay contact and the conductive busbar due to stress, and further solving the problem of the working temperature of the relay exceeding the threshold value.

[0036] As shown in Figure 1 and Figure 4 The power distribution unit of the power battery disclosed in the embodiments of the present application comprises a shell 1 and a relay 2, a conductive busbar 3, and a shunt 4.

[0037] The shell 1 comprises but is not limited to a plastic material, and optionally, the shell 1 is injection molded. The shape and size of the shell 1 can be set according to different needs, and are within the protection scope.

[0038] The shell 1 has a receiving cavity 11, which can be used to assemble the relay 2.

[0039] The relay 2 of the embodiments of the present application is connected to the shell 1 by bonding, specifically, the relay 2 is inserted into the receiving cavity 11 of the shell 1 and is bonded and connected to the inner wall of the receiving cavity 11 of the shell 1 by bonding glue.

[0040] The relay 2 is fixedly connected to the conductive busbar 3, and optionally, the relay 2 is connected to the conductive busbar 3 by a threaded connecting piece 5 including but not limited to a bolt, to realize the electrical connection between the contact of the relay 2 and the conductive busbar 3.

[0041] The connection mode of the relay 2, the shell 1, and the conductive busbar 3 is described as follows:

[0042] As shown in Figure 2 and Figure 3 The relay 2 of the embodiments of the present application comprises a first side edge 21, a second side edge 22, a third side edge 23, a fourth side edge 24, a bottom edge 25, and a panel 26. The first side edge 21, the second side edge 22, the third side edge 23, and the fourth side edge 24 are circumferentially adjacent edges of the relay 2.

[0043] The bottom edge 25 is opposite to the panel 26 and connected with the first side edge 21, the second side edge 22, the third side edge 23 and the fourth side edge 24. It can be understood that the first side edge 21, the second side edge 22, the third side edge 23, the fourth side edge 24, the bottom edge 25 and the panel 26 are connected, and the relay 2 has a rectangular structure.

[0044] The accommodating cavity 11 has a rectangular structure matched with the relay 2, and the accommodating cavity 11 has an open cavity bottom. The relay 2 is inserted into the accommodating cavity 11 through the opening, and the bottom edge 25 of the relay 2 can be bonded with the cavity bottom after the relay 2 is inserted into the accommodating cavity 11. In addition, at least one of the first side edge 21, the second side edge 22, the third side edge 23 and the fourth side edge 24 of the relay 2 is bonded with the accommodating cavity 11 after the relay 2 is inserted into the accommodating cavity 11.

[0045] It should be noted that the bottom edge 25 of the relay 2 is bonded with the cavity bottom of the accommodating cavity 11 after the relay 2 is inserted into the accommodating cavity 11, which can ensure the stability of the installation position of the relay 2. The bonding of at least one of the circumferential side edges of the relay 2 with the side wall opposite to the accommodating cavity 11 can increase the stability of the connection between the relay 2 and the accommodating cavity 11 of the shell 1.

[0046] After the relay 2 is inserted into the accommodating cavity 11, the bottom edge 25 and at least one side edge of the relay 2 are bonded with the accommodating cavity 11 of the shell 1, and the contact of the relay 2 is connected with the conductive busbar 3 during the bonding process. Since the bonding adhesive used in the bonding process of the relay 2 and the accommodating cavity 11 of the shell 1 has a certain curing time, the connection between the contact of the relay 2 and the conductive busbar 3 is adjusted by using the activity of the bonding adhesive before curing, so as to solve the problem that the connection between the contact of the relay 2 and the conductive busbar 3 is stressed due to the size gap caused by the manufacturing tolerance superposition, and further solve the problem of reduced contact area caused by the loosening of the connection between the contact of the relay 2 and the conductive busbar 3 due to stress, and then solve the problem of the working temperature of the relay 2 exceeding the threshold value.

[0047] During the connection between the contact of the relay 2 and the conductive busbar 3, the bonding of the bottom edge 25 of the relay 2 with the cavity bottom of the accommodating cavity 11 can avoid the problem that the relay 2 is not installed in place in the accommodating cavity 11.

[0048] In addition, after the bonding adhesive used in the bonding of the relay 2 and the accommodating cavity 11 is cured, the bottom edge 25 of the relay 2 is fixed with the cavity bottom of the accommodating cavity 11, and at least one side edge of the relay 2 is fixed with the corresponding side wall of the accommodating cavity 11, which can ensure the stability of the connection between the relay 2 and the accommodating cavity 11.

[0049] In some embodiments, the relay 2 and the inner wall of the accommodating cavity 11 of the shell 1 are bonded by an epoxy adhesive, but are not limited thereto. During the bonding process, the contact of the relay 2 and the conductive busbar 3 of the power distribution unit can be fixedly connected before the epoxy adhesive is cured, and the position of the relay 2 relative to the shell 1 can be adjusted during the connection of the contact of the relay 2 and the conductive busbar 3, so as to adjust the connection position of the contact of the relay 2 and the conductive busbar 3 and release the connection stress of the connection. After the epoxy adhesive is cured, the relay 2 and the shell 1 can be fixedly connected.

[0050] Since the epoxy adhesive has the advantages of high bonding strength, small curing shrinkage, and excellent electrical insulation performance, the bonding of the relay 2 and the shell 1 by the epoxy adhesive can ensure the connection strength of the relay 2, reduce the problem of position deviation of the relay 2 caused by impact or vibration of the power distribution unit, and ensure the accuracy of the bonding position of the relay 2 during the bonding process.

[0051] In some optional embodiments, the relay 2 and the shell 1 can also be bonded by other adhesives, such as UV adhesive. Since the UV adhesive needs to be cured by ultraviolet irradiation, the pre-fixing of the relay 2 and the shell 1 can be achieved by the bonding force before or during the curing of the UV adhesive, so as to facilitate the adjustment of the connection position of the contact of the relay 2 and the conductive busbar 3 of the power distribution unit and the release of the connection stress.

[0052] In addition, the bonding method can reduce the number of bolts during the connection of the relay 2 and the shell 1 in the power distribution unit, which is conducive to the realization of automatic production, reduces the personnel investment in the processing process, and reduces the use cost of the bolts.

[0053] In optional embodiments, the bonding between the relay 2 and the inner wall of the accommodating cavity 11 includes, but is not limited to, the bonding by dispensing, and the bonding adhesive can also be coated on the bottom edge 25 and at least one side edge of the relay 2 to form a bonding adhesive layer on the surface of the relay 2, and the bonding adhesive layer is bonded to the inner wall of the accommodating cavity 11.

[0054] It should be noted that the bonding by dispensing can reduce the bonding force during the curing process of the bonding adhesive, which facilitates the adjustment of the relative position of the connection between the contact of the relay 2 and the conductive busbar 3. In addition, the bonding by the bonding adhesive layer can increase the stability of the bonding between the relay 2 and the inner wall of the accommodating cavity 11. Those skilled in the art can select the bonding method according to different needs, and the selected bonding method is within the protection scope. Of course, different bonding methods can be used at different positions of the relay 2.

[0055] In some embodiments, the circumferential side edges of the relay 2 are bonded to the circumferential inner wall of the accommodating cavity 11 of the shell 1, so as to increase the bonding area of the relay 2 and the shell 1 and improve the stability of the connection between the relay 2 and the shell 1.

[0056] Figure 1 and Figure 2 As shown, the power distribution unit includes, but is not limited to, two relays 2, and the housing 1 has, but is not limited to, two accommodating cavities 11. Optionally, the accommodating cavities 11 correspond one-to-one with the relays 2. In this embodiment, the accommodating cavities 11 of the housing 1 are arranged side by side along a first direction, which can be understood as the length direction of the housing 1.

[0057] In this application, the shunt 4 is fixed to the housing 1, and the shunt 4 is arranged at one end of the housing 1 along the first direction. This can be understood as the relay 2 and the shunt 4 being arranged along the first direction. It should be noted that the arrangement of the relay 2 and the shunt 4 in this document can adopt existing known arrangements, and is within the scope of protection.

[0058] The connection between the distributor 4 and the housing 1 can be made by means of welding or threaded connection, among other things.

[0059] like Figure 4 As shown, the conductive busbar 3 includes a first busbar 31 and a second busbar 32, wherein the first busbar 31 is used to connect to the first contact of the relay 2, and the second busbar 32 is used to connect to the second contact of the relay 2.

[0060] It should be noted that the first and second contacts of relay 2 can be used as positive and negative terminals respectively, depending on the connected circuit.

[0061] Optionally, the first busbar 31 has a U-shaped structure, and one end of the first busbar 31 is fixedly connected to the housing 1, while the other end of the first busbar 31 is opposite to the opening of the accommodating cavity 11, so as to facilitate connection with the first contact on the panel 26 of the relay 2.

[0062] The second busbar 32 has an L-shaped structure, and one end of the second busbar 32 is fixedly connected to the housing 1, while the other end of the second busbar 32 is opposite to the opening of the accommodating cavity 11, so as to connect to the second contact on the panel 26 of the relay 2.

[0063] The shapes of the first busbar 31 and the second busbar 32 in this application embodiment can be set according to different avoidance requirements, and the positions of the first busbar 31 and the second busbar 32 for connecting with the housing 1 can also be set according to different avoidance requirements, and all are within the protection range.

[0064] Furthermore, this utility model embodiment also discloses a vehicle power battery, including a power distribution unit, wherein the power distribution unit is the power distribution unit disclosed in the above embodiment. Therefore, the power battery having the power distribution unit also has all the above-mentioned technical effects, which will not be repeated here.

[0065] In addition, the utility model discloses a kind of vehicles, including power battery, wherein, the power battery is the power battery disclosed in above-mentioned embodiment, therefore, the vehicle with the power battery also has all the technical effects described above, here no longer repeat.

[0066] Each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between each embodiment can be referred to each other.

[0067] The above description of the disclosed embodiments enables those skilled in the art to implement or use the utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power distribution unit for a power battery, characterized in that, include: A housing (1) having a receiving cavity (11) having an opening; A relay (2) is disposed within the accommodating cavity (11). The relay (2) includes a bottom edge (25) and a first side edge (21), a second side edge (22), a third side edge (23), and a fourth side edge (24) arranged sequentially along the circumference. At least one of the first side edge (21), the second side edge (22), the third side edge (23), and the fourth side edge (24) is bonded to the cavity wall opposite to the accommodating cavity (11), and the bottom edge (25) is bonded to the bottom of the accommodating cavity (11). The bottom of the accommodating cavity (11) is opposite to the opening of the accommodating cavity (11).

2. The power distribution unit of the power battery according to claim 1, characterized in that, At least two opposite sides of the first side (21), the second side (22), the third side (23) and the fourth side (24) are bonded to the accommodating cavity (11).

3. The power distribution unit of the power battery according to any one of claims 1 or 2, characterized in that, The relay (2) is bonded to the accommodating cavity (11) by dispensing adhesive.

4. The power distribution unit of the power battery according to any one of claims 1 or 2, characterized in that, The relay (2) and the accommodating cavity (11) are bonded together with epoxy glue or UV glue.

5. The power distribution unit of the power battery according to any one of claims 1 or 2, characterized in that, There are at least two relays (2), and the housing (1) has a receiving cavity (11) corresponding to each relay (2).

6. The power distribution unit of the power battery according to claim 5, characterized in that, The accommodating cavity (11) of the housing (1) is arranged side by side along a first direction.

7. The power distribution unit of the power battery according to claim 6, characterized in that, Also includes: A diverter (4) is fixed to the housing (1) and is arranged at one end of the housing (1) along a first direction.

8. The power distribution unit of the power battery according to any one of claims 1 or 2, characterized in that, Also includes: The conductive busbar (3) is fixedly connected to the contacts of the relay (2); The conductive busbar (3) is connected to the opening of the housing (1) near the accommodating cavity (11).

9. The power distribution unit of the power battery according to claim 8, characterized in that, The conductive busbar (3) includes: The first busbar (31) has a U-shaped structure, and one end of the first busbar (31) is fixedly connected to the housing (1), and the other end of the first busbar (31) is opposite to the opening of the accommodating cavity (11) and connected to the first contact of the relay (2). The second busbar (32) has an L-shaped structure, and one end of the second busbar (32) is fixedly connected to the housing (1), and the other end of the second busbar (32) is opposite to the opening of the accommodating cavity (11) and connected to the second contact of the relay (2).

10. A power battery, comprising a power distribution unit, characterized in that, The power distribution unit is the power distribution unit as described in any one of claims 1 to 9.

11. A vehicle, comprising a power battery, characterized in that, The power battery is the power battery as described in claim 9.

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