Battery circuit breaking unit and power battery

Abstract

The utility model provides a battery circuit breaking unit and a power battery, the battery circuit breaking unit comprises a first copper bar, an upper shell and a lower shell, the upper shell covers the lower shell, the upper shell and the lower shell define a containing cavity, the lower shell is further provided with a mounting cavity outside the containing cavity, and the mounting cavity is provided with a first copper bar and a second copper bar. The installation cavity is suitable for containing a PCBA module of the battery management system, the first copper bar is arranged in the installation cavity, the first end of the first copper bar extends into the containing cavity, the second end of the first copper bar extends out of the installation cavity, the first copper bar is bent to form a plurality of segments, and the first copper bar is arranged in the containing cavity. And each section is propped against the inner wall of the lower shell. Through the arrangement, the heat dissipation effect and the energy density of the power battery are improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery circuit breaker unit and a power battery. Background Art

[0002] The battery disconnect unit (BDU) is an important protection module for the high-voltage circuit system of the electric vehicle power battery. Its function is to coordinate the functional conversion and energy allocation of the drive motor control, DC / DC charging, air conditioning and other systems. It also has the functions of realizing rapid protection against short-circuit overload and leakage protection, playing an important role in electric vehicles.

[0003] The internal layout of the power battery of new energy vehicles is compact, among which the battery circuit breaker unit and the battery management system (BMS) occupy a large amount of internal space. However, due to the different sizes of the battery circuit breaker unit and the battery management system, it is easy to cause space waste inside the power battery when they are matched with each other, affecting the space utilization and energy density of the power battery. At the same time, the heat dissipation effect of the battery circuit breaker unit is not good, which is not conducive to improving the safety and service life of the power battery. Utility Model Content

[0004] In view of this, the present application provides a battery disconnect unit and a power battery, which can improve the heat dissipation effect and energy density of the power battery.

[0005] Specifically, the following technical solutions are included:

[0006] In a first aspect, an embodiment of the present application provides a battery circuit breaker unit, comprising a first copper bar, an upper shell and a lower shell, wherein the upper shell cover is arranged on the lower shell, and the upper shell and the lower shell are arranged to form a accommodating cavity, and the lower shell is further configured with an installation cavity outside the accommodating cavity, and the installation cavity is suitable for accommodating a PCBA module of a battery management system, the first copper bar is arranged in the installation cavity, the first end of the first copper bar extends into the accommodating cavity, and the second end of the first copper bar extends out of the installation cavity, the first copper bar is bent to form a plurality of segments, and each of the segments abuts against the inner wall of the lower shell.

[0007] In an optional embodiment, each of the segments of the first copper busbar is in sheet shape, at least one of the segments is covered on the side wall of the lower shell, and / or at least one of the segments is covered on the bottom wall of the lower shell.

[0008] In an optional embodiment, the ratio of the width to the length of the lower shell is 0.16 to 0.3.

[0009] In an optional embodiment, the upper shell is provided with a wire harness accommodating groove, and a plurality of limiting members are protruding from the inner side wall of the wire harness accommodating groove.

[0010] In an optional embodiment, the battery circuit breaker unit further includes a second copper bar, a smart fuse, a third copper bar, a current sensor, a fourth copper bar, a first main relay, a fifth copper bar, a second main relay and a sixth copper bar contained in the accommodating cavity;

[0011] The second copper busbar, the smart fuse, the third copper busbar, the current sensor, the fourth copper busbar, the first main relay, the fifth copper busbar, the second main relay and the sixth copper busbar are connected in sequence to form a positive electrode loop.

[0012] In an optional embodiment, the battery circuit breaker unit further includes a fuse, a seventh copper bar, a third main relay, an eighth copper bar, a fourth main relay and a ninth copper bar accommodated in the accommodating cavity;

[0013] The first copper bar, the fuse, the seventh copper bar, the third main relay, the eighth copper bar, the fourth main relay and the ninth copper bar are connected in sequence to form a negative electrode loop.

[0014] In an optional embodiment, the fifth copper bar, the sixth copper bar, the eighth copper bar and the ninth copper bar are respectively provided with lead-out points extending out of the accommodating cavity, the lead-out point of the fifth copper bar constitutes the discharge output positive pole, the lead-out point of the sixth copper bar constitutes the fast charging input positive pole, the lead-out point of the eighth copper bar constitutes the discharge output negative pole, and the lead-out point of the ninth copper bar constitutes the fast charging input negative pole.

[0015] In an optional embodiment, the battery disconnect unit further comprises a connection point protection cover, wherein the connection point protection cover is disposed on the lower shell, and each of the lead-out points is located in a space defined by the connection point protection cover and the lower shell.

[0016] In an optional embodiment, there are two connection point protection covers, one of which is used to shield the discharge output positive pole and the discharge output negative pole, and the other connection point protection cover is used to shield the fast charge input positive pole and the fast charge input negative pole.

[0017] In a second aspect, an embodiment of the present application provides a power battery, the power battery comprising a battery disconnect unit provided by any embodiment of the first aspect.

[0018] The beneficial effects of the technical solution provided by the embodiment of the present application include at least: by providing an upper shell and a lower shell to form an accommodating cavity, it is convenient to arrange the components in the accommodating cavity, so that the internal structure of the battery circuit breaker unit is compact; by providing a mounting cavity in the lower shell structure, an installation position is reserved for the PCBA module of the battery management system, which is convenient for integrating the PCBA module of the battery management system and the battery circuit breaker unit, which is beneficial to improving the space utilization inside the power battery, and then improving the energy density of the power battery; because the first copper bar is bent to form a plurality of segments, and each segment is abutted against the inner wall of the lower shell, the space occupied by the first copper bar in the mounting cavity is saved, which plays a role in avoiding the PCBA module, so that the space utilization inside the battery circuit breaker unit is improved, and the first copper bar can dissipate heat while transmitting electric energy, which helps to improve the heat dissipation effect of the battery circuit breaker unit and improve the safety and service life of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 An exploded diagram of a battery disconnect unit provided in an embodiment of the present application;

[0021] Figure 2 A top view of a battery disconnect unit provided in an embodiment of the present application after removing the upper housing and the upper cover;

[0022] Figure 3 A three-dimensional diagram of a battery disconnect unit provided in an embodiment of the present application;

[0023] Figure 4 A schematic diagram of the structure of the upper housing provided in an embodiment of the present application;

[0024] Figure 5 A partially enlarged view of a battery disconnect unit provided in an embodiment of the present application.

[0025] The reference numerals in the figures represent respectively:

[0026] 1-upper shell; 11-wire harness receiving groove; 12-limiting piece; 2-lower shell; 21-accommodating cavity; 22-installing cavity; 31-first copper bar; 32-second copper bar; 33-third copper bar; 34-fourth copper bar; 35-fifth copper bar; 351-discharge output positive pole; 36-sixth copper bar; 361-fast charge input positive pole; 37-seventh copper bar; 38-eighth copper bar; 381-discharge output negative pole; 39-ninth copper bar; 391-fast charge input negative pole; 4-intelligent insurance; 5-current sensor; 61-first main relay; 62-second main relay; 63-third main relay; 64-fourth main relay; 7-fuse; 8-connection point protection cover; 9-upper cover; 10-wiring harness; 110-fastener; 120-pre-charge resistor.

[0027] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] The directional nouns involved in the embodiments of the present application, such as "upper", "lower", "side", etc., are generally represented by Figure 1 The relative relationship of the orientation shown in the figure is used as the basis, and these orientation terms are used only to more clearly describe the relationship between structures, not to describe absolute orientation. When the product is placed in different postures, the orientation may change, for example, "up" and "down" may be interchangeable.

[0030] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as those generally understood by those of ordinary skill in the art. Some technical terms appearing in the embodiments of the present application are explained below.

[0031] In order to make the technical solutions and advantages of the present application more clear, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0032] An embodiment of the present application provides a battery disconnect unit. Exemplarily, the battery disconnect unit is applied to a power battery of a new energy vehicle.

[0033] like Figures 1 to 3As shown, the battery circuit breaker unit includes a first copper bar 31, an upper shell 1 and a lower shell 2. The upper shell 1 is covered on the lower shell 2, and the upper shell 1 and the lower shell 2 are surrounded to form a accommodating cavity 21. The lower shell 2 is also configured with an installation cavity 22 outside the accommodating cavity 21. The installation cavity 22 is suitable for accommodating a PCBA (Printed Circuit Board Assembly) module of the battery management system. The first copper bar 31 is arranged in the installation cavity 22. The first end of the first copper bar 31 extends into the accommodating cavity 21, and the second end of the first copper bar 31 extends out of the installation cavity 22. The first copper bar 31 is bent to form a plurality of segments, and each segment abuts against the inner wall of the lower shell 2.

[0034] like Figure 3 As shown, the upper shell 1 is connected to the lower shell 2, and the upper shell 1 and the lower shell 2 define a receiving cavity 21 for receiving components of the battery disconnect unit. Exemplarily, the upper shell 1 and the lower shell 2 are connected by snap-fit, which has a simple structure and is easy to disassemble and assemble.

[0035] like Figure 2 As shown, the accommodating cavity 21 and the installation cavity 22 are arranged along the length direction of the lower shell 2. The installation cavity 22 reserves an installation space for the PCBA module, which is convenient for integrating the PCBA module and the battery circuit breaker unit of the battery management system, which is beneficial to improving the space utilization inside the power battery, thereby improving the energy density of the power battery.

[0036] Alternatively, if Figure 3 As shown, the battery disconnect unit further includes an upper cover 9 , which is disposed on the lower housing 2 and is located above the mounting cavity 22 . The upper cover 9 is used to close the mounting cavity 22 , thereby protecting the components in the mounting cavity 22 .

[0037] The first copper bar 31 is a conductive element. The first end and the second end of the first copper bar 31 are two ends in the length direction of the first copper bar 31. The first end of the first copper bar 31 extends into the installation cavity 22 for connecting with the components in the installation cavity 22. The second end of the first copper bar 31 extends out of the installation cavity 22 for connecting with other components in the power battery, for example, as a total negative of the battery to connect with the battery cell.

[0038] The first copper bar 31 has a plurality of segments connected in sequence, and each segment abuts against the inner wall of the lower shell 2. Exemplarily, the inner wall of the lower shell 2 includes a bottom wall and a plurality of side walls, and the bottom wall and the plurality of side walls are jointly arranged to form the installation cavity 22, and the plurality of side walls are connected in sequence and are perpendicular to the bottom wall, and each segment of the first copper bar 31 abuts against the side wall or the bottom wall of the lower shell 2.

[0039] By setting each segment of the first copper bar 31 to abut against the inner wall of the lower housing 2, the space occupied by the first copper bar 31 in the installation cavity 22 is saved, and the PCBA module is avoided. In addition, since the first copper bar 31 is made of a metal material with thermal conductivity, the first copper bar 31 can transfer the heat at the first end to the air and the lower housing 2, which has a heat dissipation effect and reduces the temperature of the components in the accommodating cavity 21.

[0040] The battery circuit breaker unit provided in the embodiment of the present application forms a accommodating cavity 21 by providing an upper shell 1 and a lower shell 2 to facilitate the arrangement of components in the accommodating cavity 21, so that the internal structure of the battery circuit breaker unit is compact; the lower shell 2 is provided with an installation cavity 22 to reserve an installation position for the PCBA module of the battery management system, so that the PCBA module of the battery management system and the battery circuit breaker unit are conveniently arranged in an integrated manner, which is beneficial to improving the space utilization rate inside the power battery, and thus improving the energy density of the power battery; because the first copper bar 31 is bent to form a plurality of segments, and each segment abuts against the inner wall of the lower shell 2, the space occupied by the first copper bar 31 in the installation cavity 22 is saved, which plays a role in avoiding the PCBA module, so that the space utilization rate inside the battery circuit breaker unit is improved, and the first copper bar 31 can dissipate heat while transmitting electric energy, which helps to improve the heat dissipation effect of the battery circuit breaker unit and improve the safety and service life of the power battery.

[0041] In a further embodiment, each segment of the first copper busbar 31 is in a sheet shape, at least one segment covers the side wall of the lower shell 2 , and / or at least one segment covers the bottom wall of the lower shell 2 .

[0042] like Figure 1 As shown, each segment of the first copper bar 31 is a sheet with a relatively small thickness, which can not only reduce the occupied space and improve the avoidance effect of the PCBA module, but also increase the contact area between the first copper bar 31 and the inner wall of the lower shell 2 to improve the heat dissipation effect.

[0043] For example, the first copper bar 31 only abuts against the side wall of the lower shell 2; or, the first copper bar 31 only abuts against the bottom wall of the lower shell 2; or, part of the first copper bar 31 abuts against the side wall of the lower shell 2, and another part of the first copper bar 31 abuts against the bottom wall of the lower shell 2.

[0044] For example, Figure 1 As shown, the first copper busbar 31 has a plurality of segments, and each segment is arranged perpendicular to the adjacent segment.

[0045] In a further embodiment, the ratio of the width to the length of the lower housing 2 is 0.16-0.3.

[0046] Figure 2This is a top view of the battery disconnect unit after removing the upper housing 1 and the upper cover 9, as shown in FIG. Figure 2 As shown, the width of the lower shell 2 is the dimension in the horizontal direction, and the length of the lower shell 2 is the dimension in the vertical direction. For example, the length of the lower shell 2 is 500 mm to 600 mm, the width of the lower shell 2 is 100 mm to 150 mm, and the ratio of the width to the length of the lower shell 2 can be 0.16, 0.2, 0.25, 0.3, etc.

[0047] Through this arrangement, the battery circuit breaker unit presents a slender shape, which is convenient for the internal layout of the power battery, leaving sufficient and complete layout space for the battery module, and helps to improve the energy density of the power battery.

[0048] In a further embodiment, Figure 4 As shown, the upper shell 1 is provided with a wire harness containing groove 11 , and a plurality of stoppers 12 are protrudingly provided on the inner side wall of the wire harness containing groove 11 .

[0049] The wire harness accommodating groove 11 is used to accommodate the wire harness 10 of the battery disconnecting unit, and the limiting member 12 is used to limit the wire harness 10 to prevent the wire harness 10 from escaping from the wire harness accommodating groove 11 .

[0050] By providing the wire harness receiving groove 11 in the upper shell 1, the wire harness 10 can be effectively accommodated, while saving the space occupied by the wire harness 10, making the structure of the battery disconnect unit more neat and compact.

[0051] In a further embodiment, the battery circuit breaker unit also includes a second copper bar 32, a smart fuse 4, a third copper bar 33, a current sensor 5, a fourth copper bar 34, a first main relay 61, a fifth copper bar 35, a second main relay 62 and a sixth copper bar 36 accommodated in the accommodating cavity 21; the second copper bar 32, the smart fuse 4, the third copper bar 33, the current sensor 5, the fourth copper bar 34, the first main relay 61, the fifth copper bar 35, the second main relay 62 and the sixth copper bar 36 are connected in sequence to form a positive pole circuit.

[0052] Exemplarily, the battery disconnect unit further includes a pre-charging relay and a pre-charging resistor 120 , which are connected in series and in parallel with the first main relay 61 .

[0053] Among them, the current sensor 5 can be compared with the current detection element in the battery management system to meet higher detection accuracy and fault diagnosis requirements.

[0054] The first end of the second copper busbar 32 extends out of the accommodating cavity 21 and is connected to the battery cell of the power battery as a battery positive, and the second end of the second copper busbar 32 is connected to the smart fuse 4 .

[0055] Exemplarily, the second copper bar 32, the third copper bar 33, the fourth copper bar 34, the fifth copper bar 35 and the sixth copper bar 36 are all bent to form multiple segments, and each segment is sheet-shaped, and the second copper bar 32, the third copper bar 33, the fourth copper bar 34, the fifth copper bar 35 and the sixth copper bar 36 are connected to corresponding components by fasteners 110 such as bolts.

[0056] In a further embodiment, the battery circuit breaker unit also includes a fuse 7, a seventh copper bar 37, a third main relay 63, an eighth copper bar 38, a fourth main relay 64 and a ninth copper bar 39 accommodated in the accommodating cavity 21; the first copper bar 31, the fuse 7, the seventh copper bar 37, the third main relay 63, the eighth copper bar 38, the fourth main relay 64 and the ninth copper bar 39 are connected in sequence to form a negative electrode circuit.

[0057] Exemplarily, the seventh copper bar 37, the eighth copper bar 38 and the ninth copper bar 39 are all bent to form multiple segments, and each segment is sheet-shaped, and the first copper bar 31, the seventh copper bar 37, the eighth copper bar 38 and the ninth copper bar 39 are connected to corresponding components by fasteners 110 such as bolts.

[0058] In a further embodiment, the fifth copper bar 35, the sixth copper bar 36, the eighth copper bar 38 and the ninth copper bar 39 are respectively provided with lead-out points extending out of the accommodating cavity 21, the lead-out point of the fifth copper bar 35 constitutes the discharge output positive electrode 351, the lead-out point of the sixth copper bar 36 constitutes the fast charging input positive electrode 361, the lead-out point of the eighth copper bar 38 constitutes the discharge output negative electrode 381, and the lead-out point of the ninth copper bar 39 constitutes the fast charging input negative electrode 391.

[0059] Furthermore, the battery disconnect unit further comprises a connection point protection cover 8 , which is disposed on the lower shell 2 , and each lead-out point is located in a space defined by the connection point protection cover 8 and the lower shell 2 .

[0060] By providing the connection point protection cover 8, the lead-out point is protected during assembly and maintenance, thereby improving the safety and reliability of the battery disconnect unit.

[0061] Specifically, there are two connection point protection covers 8, one of which is used to shield the discharge output positive pole 351 and the discharge output negative pole 381, and the other connection point protection cover 8 is used to shield the fast charge input positive pole 361 and the fast charge input negative pole 391.

[0062] like Figure 5 As shown, the discharge output positive pole 351 and the discharge output negative pole 381 are adjacent, and one of the connection point protection covers 8 simultaneously shields the discharge output positive pole 351 and the discharge output negative pole 381, the fast charge input positive pole 361 and the fast charge input negative pole 391 are adjacent, and the other connection point protection cover 8 simultaneously shields the fast charge input positive pole 361 and the fast charge input negative pole 391.

[0063] An embodiment of the present application also provides a power battery, comprising a battery circuit breaker unit provided in any of the above embodiments.

[0064] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0065] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the present application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only.

[0066] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A battery disconnect unit, characterized in that: The battery disconnect unit comprises a first copper bar (31), an upper shell (1) and a lower shell (2); the upper shell (1) is covered on the lower shell (2), and the upper shell (1) and the lower shell (2) are arranged to form a receiving cavity (21); the lower shell (2) is further provided with an installation cavity (22) outside the receiving cavity (21); the installation cavity (22) is suitable for accommodating a PCBA module of a battery management system; the first copper bar (31) is arranged in the installation cavity (22); the first end of the first copper bar (31) extends into the receiving cavity (21), and the second end of the first copper bar (31) extends out of the installation cavity (22); the first copper bar (31) is bent to form a plurality of segments, and each of the segments abuts against an inner wall of the lower shell (2).

2. The battery disconnect unit according to claim 1, characterized in that: Each of the segments of the first copper bar (31) is in sheet form, and at least one of the segments covers the side wall of the lower shell (2), and / or at least one of the segments covers the bottom wall of the lower shell (2).

3. The battery disconnect unit according to claim 1, characterized in that: The ratio of the width to the length of the lower shell (2) is 0.16 to 0.

3.

4. The battery disconnect unit according to claim 1, characterized in that: The upper shell (1) is provided with a wire harness accommodating groove (11), and a plurality of stoppers (12) are protrudingly provided on the inner side wall of the wire harness accommodating groove (11).

5. The battery disconnect unit according to claim 1, characterized in that: The battery disconnect unit further comprises a second copper bar (32), an intelligent fuse (4), a third copper bar (33), a current sensor (5), a fourth copper bar (34), a first main relay (61), a fifth copper bar (35), a second main relay (62) and a sixth copper bar (36) accommodated in the accommodating cavity (21); The second copper busbar (32), the smart fuse (4), the third copper busbar (33), the current sensor (5), the fourth copper busbar (34), the first main relay (61), the fifth copper busbar (35), the second main relay (62) and the sixth copper busbar (36) are connected in sequence to form a positive electrode loop.

6. The battery disconnect unit according to claim 5, characterized in that: The battery disconnect unit further comprises a fuse (7), a seventh copper bar (37), a third main relay (63), an eighth copper bar (38), a fourth main relay (64) and a ninth copper bar (39) accommodated in the accommodating cavity (21); The first copper bar (31), the fuse (7), the seventh copper bar (37), the third main relay (63), the eighth copper bar (38), the fourth main relay (64) and the ninth copper bar (39) are connected in sequence to form a negative electrode loop.

7. The battery disconnect unit according to claim 6, characterized in that: The fifth copper bar (35), the sixth copper bar (36), the eighth copper bar (38) and the ninth copper bar (39) are respectively provided with lead-out points extending out of the accommodating cavity (21); the lead-out point of the fifth copper bar (35) constitutes a discharge output positive electrode (351), the lead-out point of the sixth copper bar (36) constitutes a fast charge input positive electrode (361), the lead-out point of the eighth copper bar (38) constitutes a discharge output negative electrode (381), and the lead-out point of the ninth copper bar (39) constitutes a fast charge input negative electrode (391).

8. The battery disconnect unit according to claim 7, characterized in that: The battery disconnect unit further comprises a connection point protection cover (8), wherein the connection point protection cover (8) is disposed on the lower shell (2), and each of the lead-out points is located within a space defined by the connection point protection cover (8) and the lower shell (2).

9. The battery disconnect unit according to claim 8, characterized in that: There are two connection point protection covers (8), one of which is used to shield the discharge output positive electrode (351) and the discharge output negative electrode (381), and the other connection point protection cover (8) is used to shield the fast charge input positive electrode (361) and the fast charge input negative electrode (391).

10. A power battery, characterized in that: The power battery comprises the battery disconnect unit according to any one of claims 1 to 9.

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