Battery pack

Abstract

The utility model discloses a battery pack, which comprises a box body, a battery pack, a battery pack cover, a battery pack, a battery pack cover and a battery pack cover, the box body is internally provided with an accommodating cavity, and one end of the accommodating cavity is provided with a mounting area; the battery module is arranged in the accommodating cavity; the high-voltage control box assembly is arranged in the mounting area; the cold plate is arranged in the containing cavity and located on the lower side of the high-pressure control box assembly. According to the battery pack disclosed by the utility model, the cold plate is arranged at the bottom of the high-voltage control box assembly and is used for cooling the high-voltage control box assembly, so that the temperature rise requirement of the high-voltage control box assembly under 5C fast charge is met, and the cost increase caused by high-specification type selection of a relay and a contactor of the high-voltage control box assembly is avoided; the efficiency and the service life of the battery pack are improved, the safety of the battery pack is ensured, and the integration degree in the battery pack is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a battery pack. Background Technology

[0002] Related technologies indicate that with the continuous development of electric vehicles, the charging time requirements for battery packs are becoming increasingly shorter. During 4C and 5C fast charging, the battery drain circuit (BDU) generates a large amount of heat. Excessive temperature rise can cause relays and contactors inside the BDU to stick or burn out, rendering them unable to meet functional requirements. Simultaneously, longer driving ranges require battery packs to accommodate higher capacities within a limited space, necessitating the placement of more cells. The battery pack contains inlet / outlet water inlets, cooling pipes, and wiring harnesses, requiring more space for piping and posing a risk of coolant leakage. Furthermore, the design of safety spaces between the battery pack's upper casing and the cells further reduces the space available for cell placement within the pack. Therefore, integrated battery packs with high volume utilization have become the development trend.

[0003] In existing technologies, the battery pack cold plate only dissipates heat from the battery cells in the battery pack design. Design requirements are met by selecting relays and contactors for the battery pack's battery drain circuit (BDU). However, with the increasing demands of 4C and 5C fast charging, the higher current draw leads to increased costs for relays and contactors, and also increases the probability of BDU failure. The overall integration level of the battery pack layout is low. The inlet and outlet ports of the thermal management system are located inside the battery pack and connected by cooling pipes, requiring more space for the cooling pipes and posing a risk of pipe interface leakage. The safety space between the battery pack's upper casing and the battery cells further reduces the space available for arranging the cells within the battery pack. Overall, the integration level of the battery pack layout is low. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a battery pack that has good safety and a high degree of integration.

[0005] The battery pack according to this utility model includes: a housing with a receiving cavity formed inside the housing and an installation area formed at one end of the receiving cavity; a battery module disposed in the receiving cavity; a high-voltage control box assembly disposed in the installation area; and a cold plate disposed in the receiving cavity and located below the high-voltage control box assembly.

[0006] According to the present invention, the battery pack has a cooling plate arranged at the bottom of the high-voltage control box assembly. The cooling plate cools the high-voltage control box assembly, which meets the temperature rise requirements of the high-voltage control box assembly under 5C fast charging. This avoids the cost increase caused by the high-specification selection of relays and contactors in the high-voltage control box assembly, improves the efficiency and service life of the battery pack, ensures the safety of the battery pack, and improves the degree of integration inside the battery pack.

[0007] In some embodiments, the battery pack further includes a thermally conductive component disposed between the cold plate and the high-voltage control box assembly. The thermally conductive component includes an insulating film and a first thermally conductive element, wherein the insulating film is located between the first thermally conductive element and the high-voltage control box assembly.

[0008] In some embodiments, the high-voltage control box assembly includes a heat dissipation copper busbar, at least a portion of which is connected to the heat-conducting component.

[0009] In some embodiments, a cooling channel is formed in the cold plate, and coolant is disposed in the cooling channel. An inlet and an outlet are formed in the cold plate, and both the inlet and the outlet are connected to the cooling channel. Both the inlet and the outlet are located on the outside of the battery pack.

[0010] In some embodiments, the housing includes a rear side beam and a rear crossbeam, the rear side beam and the rear crossbeam defining the mounting area, the top of the mounting area forming a maintenance opening, the housing also including an upper shell and a cover, the upper shell covering the top of the receiving cavity, the cover being detachably covering the location of the maintenance opening, and the upper surface of the rear crossbeam and the lower surface of the cover being fitted together.

[0011] In some embodiments, the upper housing includes a first layer plate and a second layer plate, the second layer plate being disposed between the first layer plate, the first layer plate and the second layer plate being bonded together, the first layer plate being formed as a steel part, the second layer plate being formed as a composite material part, and / or, a groove extending along the length direction of the rear crossbeam is formed on the rear crossbeam.

[0012] In some embodiments, the housing includes a base plate on which a mounting portion is formed, the mounting portion being located in the middle of the receiving cavity, the mounting portion being used to fix the battery module.

[0013] In some embodiments, the housing includes a left beam and a right beam, with a main control wiring harness disposed between the left beam and the battery module, and between the right beam and the battery module.

[0014] In some embodiments, the housing further includes a front beam, on which vent holes are formed, and the vent holes communicate with the receiving cavity.

[0015] In some embodiments, the enclosure includes: a longitudinal beam, a high-voltage wiring harness and a front-drive copper busbar are provided above the longitudinal beam, the explosion-proof valves of the battery module are located on both sides of the longitudinal beam in the width direction and are arranged opposite to the longitudinal beam, the front-drive copper busbar extends along the length direction of the longitudinal beam, one end of the front-drive copper busbar is connected to the front-drive plug, and the other end of the front-drive copper busbar extends into the groove and is connected to the high-voltage control box assembly.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is an exploded view of a battery pack according to an embodiment of the present utility model;

[0018] Figure 2 yes Figure 1 A top view of the battery pack shown;

[0019] Figure 3 yes Figure 1 A schematic diagram of the box shown;

[0020] Figure 4 yes Figure 2 A partially enlarged schematic diagram of the mounting portion shown;

[0021] Figure 5 yes Figure 2 The assembly diagram of the main control harness shown in the figure;

[0022] Figure 6 yes Figure 2 The diagram shows the assembly of the high-voltage wiring harness and the longitudinal beam.

[0023] Figure 7 yes Figure 2 A partially enlarged schematic diagram of the rear crossbeam shown;

[0024] Figure 8 yes Figure 1 A top view of the battery pack shown;

[0025] Figure 9 yes Figure 3 A schematic diagram of the box from another angle;

[0026] Figure 10 yes Figure 1 A schematic diagram of the cold plate shown;

[0027] Figure 11 yes Figure 2 A schematic diagram of the battery module shown;

[0028] Figure 12 yes Figure 8 A partially enlarged schematic diagram of the battery pack shown;

[0029] Figure 13 yes Figure 2 The diagram shows the assembly of the high-voltage control box assembly and the heat-conducting components.

[0030] Figure 14 yes Figure 13 The diagram shows another view of the assembly of the high-voltage control box assembly and the heat-conducting components.

[0031] Figure label:

[0032] 100. Battery pack;

[0033] 1. Housing; 101. Rear side beam; 102. Rear crossbeam; 1021. Groove; 103. Upper shell; 104. Cover; 105. Bottom plate; 1051. Mounting part; 106. Left side beam; 107. Right side beam; 108. Front side beam; 109. Longitudinal beam; 1091. Exhaust passage; 1010. Middle crossbeam; 10101. Reinforcing block; 1011. Front crossbeam;

[0034] 2. Battery module; 201. Explosion-proof valve; 202. Busbar;

[0035] 3. High-voltage control box assembly; 301. Copper heat sink;

[0036] 4. Cold plate; 401. Inlet; 402. Outlet;

[0037] 5. Thermal conductive component; 501. Insulating film; 502. First thermal conductive element; 503. Second thermal conductive element;

[0038] 6. Thermal insulation cotton; 7. Main control wiring harness;

[0039] 8. Front drive copper busbar; 9. Front drive connector;

[0040] 10. BMS mainboard; 11. BMS slave board;

[0041] 12. PTC plugin; 13. Fast charging plugin;

[0042] 14. First seal; 15. Second seal;

[0043] 16. Rear drive connector; 17. High voltage wiring harness; 18. Exhaust vent. Detailed Implementation

[0044] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0045] The following is for reference. Figures 1-14 A battery pack 100 according to an embodiment of the present utility model is described.

[0046] like Figures 1-14 As shown, the battery pack 100 according to an embodiment of the present utility model includes: a housing 1, a battery module 2, a high-voltage control box assembly 3, and a cold plate 4.

[0047] Specifically, a receiving cavity is formed inside the housing 1, and an installation area is formed at one end of the receiving cavity. The battery module 2 is located inside the receiving cavity, the high-voltage control box assembly 3 is located within the installation area, and the cold plate 4 is located inside the receiving cavity and below the high-voltage control box assembly 3. Thus, the overall structure of the battery pack 100 is simple and ingeniously designed, and it can effectively cool the high-voltage control box assembly 3.

[0048] According to the embodiment of the present invention, the battery pack 100 has a cold plate 4 arranged at the bottom of the high voltage control box assembly 3. The cold plate 4 cools the high voltage control box assembly 3, which meets the temperature rise requirements of the high voltage control box assembly 3 under 5C fast charging. This avoids the cost increase caused by the high-specification selection of relays and contactors in the high voltage control box assembly 3, improves the efficiency and service life of the battery pack 100, ensures the safety of the battery pack 100, and improves the degree of integration inside the battery pack 100.

[0049] In some embodiments of this utility model, in order to ensure the cooling effect of the cold plate 4 on the high-voltage control box assembly 3, the battery pack 100 further includes: a heat-conducting component 5, such as... Figure 1 , Figure 2 , Figure 13 and Figure 14 As shown, the heat-conducting component 5 is disposed between the cold plate 4 and the high-voltage control box assembly 3. The heat-conducting component 5 includes an insulating film 501 and a first heat-conducting element 502. The insulating film 501 is located between the first heat-conducting element 502 and the high-voltage control box assembly 3, so that the cold plate 4 can cool the high-voltage control box assembly 3 through the heat-conducting component 5, ensuring the safety of the battery pack 100 and improving the overall performance of the battery pack 100.

[0050] In some embodiments of this utility model, such as Figure 13 and Figure 14As shown, the high-voltage control box assembly 3 includes a heat dissipation copper busbar 301, which is arranged at the bottom of the high-voltage control box assembly 3. At least a portion of the heat dissipation copper busbar 301 is connected to the heat conduction component 5. An insulating film 501 is provided between the heat dissipation copper busbars 301 by a first heat conduction component 502. The insulating film 501 has insulation and thermal conductivity. Furthermore, the first heat conduction component 502 is compressible and has a certain buffering effect, which can reduce the vibration of the battery pack 100.

[0051] In some embodiments, the heat-conducting component 5 further includes a second heat-conducting element 503, which is formed as a heat-conducting metal element and is connected between the high-voltage component and the first heat-conducting element 502.

[0052] In some embodiments of this utility model, a cooling channel is formed inside the cold plate 4, and coolant is disposed inside the cooling channel. An inlet 401 and an outlet 402 are formed on the cold plate 4, and both the inlet 401 and the outlet 402 are connected to the cooling channel. Figure 2 and Figure 10 As shown, both the inlet 401 and the outlet 402 are located on the outside of the battery pack 100, thereby avoiding the risk of coolant leakage inside the cold plate 4 and saving internal space of the battery pack 100.

[0053] In some embodiments of this utility model, such as Figure 1 As shown, the housing 1 includes a rear side beam 101 and a rear crossbeam 102, defining an installation area between the rear side beam 101 and the rear crossbeam 102. The top of the installation area forms a maintenance opening. The housing 1 also includes an upper shell 103 and a cover 104. The upper shell 103 covers the top of the receiving cavity, and the cover 104 is detachably installed at the maintenance opening. The upper surface of the rear crossbeam 102 and the lower surface of the cover 104 are fitted together. This ensures a tight seal within the receiving cavity and the installation area, and the detachable cover 104 at the maintenance opening facilitates maintenance and reduces maintenance difficulty.

[0054] In some embodiments of this utility model, the upper housing 103 includes a first layer plate and a second layer plate, with the second layer plate disposed between the first layer plates. The first layer plate and the second layer plate are bonded together. The first layer plate is formed as a steel part, and the second layer plate is formed as a composite material part. The first layer plate and the second layer plate are bonded together with structural adhesive. A groove 1021 extending along the length direction of the rear crossbeam 102 is formed on the rear crossbeam 102. The length of the groove 1021 is greater than the width of the front drive copper busbar 8. This reduces the assembly difficulty of the front drive copper busbar 8 and the high voltage control box assembly 3, reduces the risk of short circuit between the battery cell and the upper housing 103 when the battery cell experiences thermal runaway, and reduces the power loss of the battery pack 100 at low temperatures by using the low thermal conductivity of the composite material.

[0055] Furthermore, to avoid power loss in the battery pack 100 at low temperatures caused by the adhesion between the upper housing 103 and the battery module 2, such as Figure 1 As shown, thermal insulation cotton 6 is covered on the upper housing 103 to keep the battery pack 100 warm.

[0056] Furthermore, the adhesive connection between the upper housing 103 and the battery cell saves the distance between the upper housing 103 and the battery module 2, improves the integration level of the battery pack 100, increases the volume utilization rate of the battery pack 100, and improves the energy density of the battery pack 100.

[0057] In some embodiments of this utility model, such as Figure 4 As shown, the housing 1 includes: a base plate 105, on which a mounting portion 1051 is formed. The mounting portion 1051 is located in the middle of the receiving cavity and is used to fix the battery pack 100. By setting the mounting portion 1051 in the middle of the base plate 105, the robustness and reliability of the battery pack 100 during vehicle operation are improved.

[0058] In some embodiments of this utility model, such as Figure 3 and Figure 5 As shown, the housing 1 includes a left beam 106 and a right beam 107. A main control wiring harness 7 is installed between the left beam 106 and the battery module 2, and the same main control wiring harness 7 is installed between the right beam 107 and the battery module 2. This fully utilizes the internal space of the battery pack 100. Furthermore, the space between the left beam 106 and the battery module 2 forms a collision safety space in the event of a side pole impact with the vehicle, and the space between the right beam 107 and the battery module 2 also forms a collision safety space in the event of a side pole impact with the vehicle, ensuring the internal safety of the battery pack 100.

[0059] In some embodiments of this utility model, such as Figure 9 As shown, the housing 1 also includes a front beam 108, on which vent holes 18 are formed, and the vent holes 18 communicate with the receiving cavity. Thus, in the event of thermal runaway, high-temperature gas can be quickly discharged from the housing 1, reducing the pressure inside the housing 1 and ensuring the safety of the battery pack 100.

[0060] Furthermore, an exhaust channel 1091 is defined between the battery module 2 and the longitudinal beam 109, and the explosion-proof valves 201 are all located in the exhaust channel 1091. Each exhaust hole 18 is connected to the exhaust channel 1091, thereby further accelerating the discharge of high-temperature gas from the housing 1.

[0061] Furthermore, the box body 1 also includes a front crossbeam 1011, which is arranged adjacent to the front side beam 108.

[0062] In some embodiments of this utility model, such as Figure 6 As shown, the housing 1 includes a longitudinal beam 109. A high-voltage wiring harness 17 and a front-drive copper busbar 8 are located above the longitudinal beam 109. The explosion-proof valves 201 of the battery module 2 are located on both sides of the longitudinal beam 109 in the width direction and are opposite to the longitudinal beam 109. The front-drive copper busbar 8 extends along the length direction of the longitudinal beam 109. One end of the front-drive copper busbar 8 is connected to the front-drive plug-in 9, and the other end of the front-drive copper busbar 8 extends into the groove 1021 and is connected to the high-voltage control box assembly 3. Therefore, the longitudinal beam 109 can effectively prevent the high-temperature ejected material from the cell explosion-proof valve 201 after it opens, which could cause thermal runaway of the cells on the other side of the longitudinal beam 109, in the event of thermal runaway of one cell.

[0063] In some embodiments, such as Figure 12 As shown, the housing 1 also includes a middle crossbeam 1010, on which a reinforcing block 10101 is provided, thereby strengthening the structural strength of the middle crossbeam 1010 while avoiding the busbar 202 of the battery module 2.

[0064] In some embodiments, such as Figure 2 As shown, the installation area also includes a BMS main board 10 and a BMS slave board 11. The BMS main board 10 is located on one side of the high-voltage control box assembly 3, and the BMS slave board 11 is located on the other side of the high-voltage control box assembly 3. In this way, the electrical components are centrally arranged. In the event of a fault, the electrical components can be repaired by removing the cover and opening the maintenance port, which improves the convenience of maintenance. Furthermore, the main high-voltage components of the battery pack 100 are all located at the rear of the battery pack 100. When the battery pack 100 experiences thermal runaway exhaust, the high-temperature gas will not pass through the high-voltage components, effectively preventing short circuits in the high-voltage components during thermal runaway exhaust of the battery pack 100.

[0065] Furthermore, a PTC plug-in 12 is provided at the front of the battery pack 100, a fast charging plug-in 13 is provided at the rear of the battery pack 100, a first sealing element 14 is provided between the upper shell 103 and the housing 1, and a second sealing element 15 is provided between the cover 104 and the housing 1, thereby improving the sealing effect inside the cavity.

[0066] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0067] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0068] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, include: A housing, wherein a receiving cavity is formed inside the housing, and an installation area is formed at one end of the receiving cavity; A battery module, wherein the battery module is disposed within the receiving cavity; A high-voltage control box assembly, wherein the high-voltage control box assembly is located within the installation area; A cold plate is disposed in the receiving cavity and located on the lower side of the high-voltage control box assembly, for cooling the high-voltage control box assembly; The cold plate has an inlet and an outlet, both of which are located on the outside of the battery pack.

2. The battery pack according to claim 1, characterized in that, Also includes: A heat-conducting component is disposed between the cold plate and the high-voltage control box assembly. The heat-conducting component includes an insulating film and a first heat-conducting element, with the insulating film located between the first heat-conducting element and the high-voltage control box assembly.

3. The battery pack according to claim 2, characterized in that, The high-voltage control box assembly includes a heat dissipation copper busbar, at least a portion of which is connected to the heat-conducting component.

4. The battery pack according to claim 3, characterized in that, The cold plate has a cooling channel, and the cooling channel contains coolant. The inlet and outlet are both connected to the cooling channel.

5. The battery pack according to claim 4, characterized in that, The housing includes a rear side beam and a rear crossbeam, with the rear side beam and the rear crossbeam defining the installation area. The top of the installation area forms a maintenance opening. The housing also includes an upper shell and a cover. The upper shell covers the top of the receiving cavity, and the cover is detachably placed at the location of the maintenance opening. The upper surface of the rear crossbeam and the lower surface of the cover are fitted together.

6. The battery pack according to claim 5, characterized in that, The upper housing includes a first layer plate and a second layer plate, the second layer plate being disposed between the first layer plate, the first layer plate and the second layer plate being bonded together, the first layer plate being formed as a steel part, the second layer plate being formed as a composite material part, and / or, a groove extending along the length direction of the rear crossbeam is formed on the rear crossbeam.

7. The battery pack according to claim 6, characterized in that, The housing includes a base plate, on which a mounting portion is formed. The mounting portion is located in the middle of the receiving cavity and is used to fix the battery module.

8. The battery pack according to claim 6, characterized in that, The housing includes a left beam and a right beam, with a main control wiring harness disposed between the left beam and the battery module, and between the right beam and the battery module.

9. The battery pack according to claim 8, characterized in that, The housing also includes a front beam, on which vent holes are formed, and the vent holes are connected to the receiving cavity.

10. The battery pack according to any one of claims 6-9, characterized in that, The enclosure includes: a longitudinal beam, a high-voltage wiring harness and a front-drive copper busbar are provided above the longitudinal beam, the explosion-proof valves of the battery module are located on both sides of the longitudinal beam in the width direction and are arranged opposite to the longitudinal beam, the front-drive copper busbar extends along the length direction of the longitudinal beam, one end of the front-drive copper busbar is connected to the front-drive plug, and the other end of the front-drive copper busbar extends into the groove and is connected to the high-voltage control box assembly.

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