Battery pack and electric equipment

Abstract

The utility model discloses a battery pack and electric equipment, the battery pack accommodates electrical elements used for controlling on-off and distribution of a circuit in the battery pack through a shell provided with a cut-off unit, and the ratio of the length L1 of the shell in a first direction to the length W of the shell in a second direction is limited to be larger than or equal to 2.67 and smaller than or equal to 32.5, the length of the shell in the first direction is greater than the length of the shell in the second direction, and the shell is integrally prolate, so that the shell can fully utilize the space of the battery pack in the first direction, the space ratio of the shell in the second direction is reduced as much as possible, the space utilization rate of the battery pack is improved, and the battery pack is more compact. The battery pack can accommodate more battery packs, and the energy density of the battery pack is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack and electrical device. Background Technology

[0002] The BDU (Battery Disconnect Unit), also known as the battery disconnection unit, is located inside the battery pack and is the working unit for high-voltage distribution, disconnection, and short-circuit protection of the battery system. In existing battery pack layouts, the BDU occupies too much space, resulting in low space utilization and affecting the battery pack's energy density. Utility Model Content

[0003] The purpose of this application is to provide a battery pack and electrical device to solve the problem of low space utilization and reduced energy density caused by excessive space occupied in the current battery pack.

[0004] A first aspect of this application provides a battery pack, comprising: a cutting unit, the cutting unit including a housing, the housing having a receiving cavity, the housing having a first direction and a second direction perpendicular to each other, the housing having a length L1 mm in the first direction, the housing having a length W mm in the second direction, 2.67≤L1 / W≤32.5; and a plurality of electrical components spaced apart in the receiving cavity along the first direction.

[0005] Optionally, the battery pack further includes a housing, the casing being disposed within the housing, the housing having a length L2 mm in the first direction; satisfying: 0.5 ≤ L1 / L2 ≤ 1.

[0006] Optionally, 400≤L1≤1300, and / or 800≤L2≤1500.

[0007] Optionally, the battery pack further includes a housing, the housing having a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other; the housing has a height H1 mm in the third direction; the housing has a height H2 mm in the third direction; satisfying: 0.5≤H1 / H2≤1.

[0008] Optionally, 80 ≤ H1 ≤ 200, and / or 80 ≤ H2 ≤ 200.

[0009] Optional, 40≤W≤150, and / or, 400≤L1≤1300.

[0010] Optionally, the battery pack further includes a battery management unit, which includes a control board disposed in the receiving cavity and electrically connected to the electrical components; wherein the control board and the electrical components are arranged at intervals along the second direction.

[0011] Optionally, the control board has a length L3 mm in the first direction; the control board has a height H3 mm in the third direction; satisfying: 0.5≤L3 / H3≤33.3, and / or, 1≤H2 / H3≤6.7.

[0012] Optional, 100≤L3≤1000, 30≤H3≤200.

[0013] Optionally, the electrical component includes a plurality of relays spaced apart along the first direction. Each relay has a first surface and a second surface disposed opposite to each other in a third direction. Each relay has at least two electrical connection terminals spaced apart on the first surface along the first direction. The plurality of relays includes a main positive relay and a main negative relay spaced apart along the first direction. The battery pack also includes a plurality of conductive busbars. The battery pack also includes a battery pack disposed in a housing. The at least two electrical connection terminals include a first connection terminal and a second connection terminal. The first connection terminal on the main positive relay is electrically connected to the positive terminal of the battery pack via a conductive busbar. The second connection terminal on the main negative relay is electrically connected to the negative terminal of the battery pack via a conductive busbar.

[0014] Meanwhile, a second aspect of the embodiments of this application provides an electrical device, including the battery pack as described above.

[0015] In summary, the embodiments of this application provide a battery pack and an electrical device having the battery pack. The battery pack is provided with a housing to accommodate electrical components for controlling the on / off switching and distribution of circuits within the battery pack. The ratio of the length L1 of the housing in the first direction to the length W in the second direction is defined as 2.67 ≤ L1 / W ≤ 32.5, so that the length of the housing in the first direction is greater than the length of the housing in the second direction. The overall shape of the housing is flat and elongated, which allows the housing to make full use of the space of the battery pack in the first direction and minimize the space ratio of the housing in the second direction, thereby improving the space utilization rate of the battery pack, enabling the battery pack to accommodate more battery packs, and increasing the energy density of the battery pack. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the first structure of the battery pack provided in the embodiments of this application;

[0018] Figure 2 yes Figure 1 Top view;

[0019] Figure 3 This is a schematic diagram of a second structure of the battery pack provided in the embodiments of this application;

[0020] Figure 4 yes Figure 3 Top view;

[0021] Figure 5 This is a schematic diagram of the third structure of the battery pack provided in the embodiments of this application;

[0022] Figure 6 yes Figure 5 Top view;

[0023] Figure 7 This is a schematic diagram of the structure of the relay in the battery pack provided in the embodiments of this application;

[0024] Figure 8 This is a schematic diagram of the battery pack provided in the embodiments of this application.

[0025] Explanation of key figure labels:

[0026] 100. Battery pack;

[0027] 10. Shell; 101. First sidewall; 102. Second sidewall; 103. Third sidewall; 104. Fourth sidewall; 105. Fifth sidewall; 106. Sixth sidewall; 11. Receiving cavity;

[0028] 20. Electrical components; 21. Relays; 21a. Main positive relay; 21b. Main negative relay; 21c. Fast charging relay; 211. First surface; 212. Second surface; 213. Electrical connection terminal; 2131. First connection terminal; 2132. Second connection terminal; 22. Current sensor; 23. Precharge relay; 24. Precharge resistor; 25. Fuse; 26. Shunt.

[0029] 30. Box body;

[0030] 40. Battery Management Unit; 41. Control Board; 42. Interface;

[0031] 50. Conducting bus, 51. First conducting bus, 52. Second conducting bus, 53. Third conducting bus, 54. Fourth conducting bus;

[0032] 60. Battery pack;

[0033] 70. Connector; 71. Fast charging connector; 72. Driver connector; 73. Signal connector;

[0034] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0035] To make the objectives, technical solutions, and beneficial effects of this application clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, further illustrates this application. It should be understood that the specific embodiments described in this specification are merely for explaining this application and are not intended to limit it.

[0036] In the description of this application, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not 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 application. 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 indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, 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 application according to the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the embodiments of the application, "parallel" refers to a state in which the angle defined by two lines, a line and a surface, or a surface is -1° to 1°. "Perpendicular" refers to a state in which the angle defined by two lines, a line and a surface, or a surface is 89° to 91°. Equal distances or equal angles refer to a state in which the tolerance range is -1% to 1%.

[0040] This embodiment provides an electrical device, including a battery pack 100, which serves as the power supply for the device. The electrical device may be, but is not limited to, mobile devices (e.g., mobile phones, laptops), electric vehicles (e.g., pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0041] In some embodiments of this application, a battery pack 100 is provided, see reference Figures 1 to 8 The battery pack 100 includes a cutting unit, which includes a housing 10 and electrical components 20.

[0042] Reference Figures 1-6 as well as Figure 8 The housing 10 has an internal cavity 11, as shown in the reference. Figures 1-6 The housing 10 has a first direction X, a second direction Y, and a third direction Z that are perpendicular to each other, specifically as follows: Figures 1-6 In the embodiment shown, the first direction X, the second direction Y, and the third direction Z are all orthogonal to each other. The first direction X is parallel to the length direction of the housing 10, the second direction Y is parallel to the height direction of the housing 10, and the third direction Z is parallel to the height direction of the housing 10. (Refer to...) Figure 1 , Figures 3-5The shell 10 includes a third sidewall 103 and a fourth sidewall 104 arranged opposite each other along a first direction X, a first sidewall 101 and a second sidewall 102 arranged opposite each other along a second direction Y, and a fifth sidewall 105 and a sixth sidewall 106 arranged opposite each other along a third direction Z. The first sidewall 101, the third sidewall 103, the second sidewall 102 and the fourth sidewall 104 are connected end to end in sequence to form a tetrahedral structure with open ends. The fifth sidewall 105 and the sixth sidewall 106 respectively cover the open ends to form the shell 10.

[0043] Reference Figure 1 and Figure 2 The housing 10 has a length L1 mm in the first direction X. Specifically, the length L1 is the distance between the opposite sides of the third sidewall 103 and the fourth sidewall 104 in the first direction X. The housing 10 also has a length W mm in the second direction Y. Specifically, the length W is the distance between the opposite sides of the first sidewall 101 and the second sidewall 102 in the second direction Y. The battery pack satisfies: 2.67 ≤ L1 / W ≤ 32.5. Specifically, the value of L1 / W can be any value from 2.67, 3.0, 5.0, 10.0, 15.0, 20.0, 25.0, 30.0, 32.5, or any value within a range of any two values. It should be noted that the length of the housing 10 in the first direction X refers to the maximum overall length of the housing 10.

[0044] Reference Figures 1 to 7 Electrical components 20 are spaced apart along the first direction X in the receiving cavity 11 of the housing 10.

[0045] In existing battery pack housings, the dimensions of the battery unit (BDU) in the length direction and the width direction are not significantly different. This results in a gap between the BDU and the two side walls of the housing in the width direction when the BDU is placed inside the housing. This gap prevents the placement of battery cells or other components, creating unusable space inside the housing. Consequently, the internal space of the housing cannot be fully utilized, leading to low space utilization and affecting the energy density of the battery pack.

[0046] The battery pack 100 provided in this application embodiment accommodates the electrical components 20 in the BDU used to control the on / off switching and distribution of circuits within the battery pack 100 by setting a housing 10. The ratio of the length L1 in the first direction to the length W in the second direction of the housing 10 is limited to 2.67 ≤ L1 / W ≤ 32.5. When the value of L1 / W is within the above range, the length of the housing 10 in the first direction X is significantly greater than the length of the housing 10 in the second direction Y, resulting in the overall shape of the housing 10 forming a flat, elongated cuboid structure. Furthermore, the multiple electrical components 20... The housing 10 is spaced apart in the receiving cavity 11 of the housing 10 along the first direction X, so that when the housing 10 is arranged in the box 30 of the battery pack 100, the space of the box 30 in the first direction X can be fully utilized, and the space ratio of the housing 10 in the second direction Y can be minimized. This minimizes the gap between the opposite ends of the housing 10 in the first direction X and the opposite ends of the box 30 in the first direction X, thereby providing more space for the arrangement of the battery pack 60 in the second direction Y, improving the space utilization rate inside the box 30, and increasing the energy density of the battery pack 1.

[0047] In some embodiments, refer to Figure 8 The battery pack 100 also includes a housing 30 and a battery pack 60. The housing 10 and the battery pack 60 are spaced apart in the housing 30 along a second direction Y. The first direction X is parallel to the width direction of the housing 30, the second direction Y is parallel to the length direction of the housing 30, and the third direction Z is parallel to the height direction of the housing 30. (See reference...) Figure 8 The housing 30 has a length L2 mm in the first direction X. Specifically, L2 is the distance between the opposing surfaces of the two end walls of the housing 30 in the first direction X, satisfying: 0.5 ≤ L1 / L2 ≤ 1. Specifically, the value of L1 / L2 can be any value from 0.5, 0.6, 0.7, 0.8, 0.9, 1, or any value within a range of any two values. L1 / L2 represents the proportion of space occupied by the housing 10 inside the housing 30 in the first direction X. When the value of L1 / L2 is within the above range, the housing 10 can fully utilize the space inside the housing 30 in the first direction X (i.e., the width direction of the housing 30), improving the utilization rate of the internal space of the housing 30, thereby increasing the energy density of the battery pack 100. It should be noted that the length of the housing 30 in the first direction X refers to the maximum overall length of the housing 30.

[0048] In some embodiments, 400≤L1≤1300. Specifically, the value of L1 can be any value from 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, and 1300, or any value within a range of any two values. When the value of L1 is within the above range, when the housing 10 is arranged in the box 30, the space of the box 30 in the first direction X (i.e., the width direction of the box 30) can be fully utilized, improving the space utilization rate inside the box 30 and increasing the energy density of the battery pack 100.

[0049] In some embodiments, 800 ≤ L2 ≤ 1500. Specifically, the value of L2 can be any value among 800, 900, 1000, 1100, 1200, 1300, 1400, and 1500, or any value within a range of any two values. When the value of L2 is within the above range, there is sufficient spacing between the opposing surfaces of the two end walls of the housing 30 in the first direction X to accommodate housings 10 of different sizes, thereby ensuring the space utilization rate inside the housing 30 in the first direction X and ensuring the energy density of the battery pack 100.

[0050] In some embodiments, refer to Figure 1 The housing 10 has a height H1 mm in the third direction Z. Specifically, H1 is the distance between the fifth sidewall 105 and the sixth sidewall 106 of the housing 10 in the third direction Z. Figure 8 The housing 30 has a height H2 mm in the third direction Z. Specifically, H2 is the distance between the two end walls of the housing 30 that are opposite each other in the third direction Z, satisfying: 0.5 ≤ H1 / H2 ≤ 1. Specifically, the value of H1 / H2 can be any value from 0.5, 0.6, 0.7, 0.8, 0.9, 1, or any value within a range of any two values. H1 / H2 represents the proportion of the size of the housing 10 in the third direction Z within the space inside the housing 30. When the value of H1 / H2 is within the above range, the housing 10 can fully utilize the space inside the housing 30 in the third direction Z (i.e., the height direction of the housing 30), improving the space utilization rate inside the housing 30, thereby increasing the energy density of the battery pack 100.

[0051] In some embodiments, 80 ≤ H1 ≤ 200. Specifically, the value of H1 can be any value among 80, 100, 120, 140, 160, 180, and 200, or any value within a range of any two values. When the value of H1 is within the above range, when the housing 10 is arranged in the box 30, the space of the box 30 in the third direction Z (i.e., the height direction of the box 30) can be fully utilized, thereby improving the space utilization rate inside the box 30 and increasing the energy density of the battery pack 100.

[0052] In some embodiments, 80 ≤ H2 ≤ 200. Specifically, the value of H2 can be any value among 80, 100, 120, 140, 160, 180, and 200, or any value within a range of any two values. When the value of H2 is within the above range, sufficient spacing is provided between the two opposite end walls of the housing 30 in the third direction Z to accommodate housings 10 of different sizes, thereby ensuring the space utilization rate inside the housing 30 in the first direction X and ensuring the energy density of the battery pack 100.

[0053] In some embodiments, 40 ≤ W ≤ 150. Specifically, the value of W can be any value among 40, 60, 80, 100, 120, 140, and 150, or any value within a range of any two values. When the value of W is within the above range, the housing 10 can minimize the space occupied by the housing 10 in the second direction Y inside the enclosure 30 while ensuring the assembly and arrangement of the internal electrical components 20, thereby improving the space utilization rate of the enclosure 30 in the second direction Y and increasing the energy density of the battery pack 100.

[0054] In some embodiments, refer to Figures 1-2 as well as Figures 5-6 The battery pack 100 also includes a battery management unit 40, which includes a control board 41 disposed in the receiving cavity 11. The control board 41 is electrically connected to electrical components, wherein the control board 41 and the electrical components 20 are arranged at intervals along the second direction Y. (Refer to...) Figures 1-2 as well as Figures 5-6 The control board 41 also includes an interface 42, which is located on the side of the control board 41 facing the electrical component 20 in the second direction Y. The battery management unit 40 is the BMS (Battery Management System). In existing battery packs, the BMS is usually arranged separately from the BDU in the battery pack housing, which occupies too much space inside the housing and affects the energy density of the battery pack. In this embodiment, the control board 41 of the battery management unit 40 is located in the receiving cavity 11 of the housing 10. The control board 41 and the electrical component 20 are arranged at intervals along the second direction Y, thereby integrating the battery management unit 40 and the electrical component 20 in the BDU used to control the on / off switching and distribution of circuits within the battery pack 100 into the housing 10. This fully utilizes the space inside the housing 10 in the second direction Y and reduces the space ratio inside the housing 30 in the second direction Y, thereby improving the space utilization of the housing 30 and increasing the energy density of the battery pack 100.

[0055] In some embodiments, refer to Figure 1 and Figure 2The control panel 41 has a length L3 mm in the first direction X, as shown in the reference. Figure 1 The control panel 41 has a height H3 mm in the third direction Z; satisfying: 0.5≤L3 / H3≤33.3. Specifically, the value of L3 / H3 can be any value among 0.5, 1.0, 5.0, 10.0, 15.0, 20.0, 25.0, 30.0, and 33.3, or any value within a range of any two values. When the value of L3 / H3 is within the above range, the length of the control board 41 in the first direction X can be less than the height H3 of the control board 41 in the third direction Z (0.5≤L3 / H3<1), equal to the height H3 of the control board 41 in the third direction Z (L3 / H3=1), or greater than the height H3 of the control board 41 in the third direction Z (1<L3 / H3≤33.3). This allows the control board 41 to be accommodated in the housing 10 with different L1 / W ratios without affecting the management and control of the battery management unit 40 on the voltage, current, and temperature parameters of the battery pack 60.

[0056] In some embodiments, 1 ≤ H2 / H3 ≤ 6.7. Specifically, the value of H2 / H3 can be any value among 1, 2, 3, 4, 5, 6, and 6.7, or any value within a range of any two values. When the ratio H2 / H3 of the height H2 of the housing 30 in the third direction Z to the height H3 of the control board 41 in the third direction Z is within the above range, the space ratio of the control board 41 inside the housing 30 in the third direction Z can be guaranteed, making full use of the space utilization rate of the housing 30 in the third direction Z and ensuring the energy density of the battery pack 100.

[0057] In some embodiments, 100 ≤ L3 ≤ 1000. Specifically, the value of L3 can be any value from 100, 200, 300, 400, 500, 600, 700, 800, 900, and 1000, or any value within a range of any two values. When the value of L3 is within the above range, the dimensions of the control plate 41 in the first direction X are adapted to the dimensions of the housing 10 in the first direction X, thereby enabling the control plate 41 to fully utilize the space inside the housing 10 in the first direction X and improving the utilization rate of the internal space of the housing 10.

[0058] In some embodiments, 30 ≤ H3 ≤ 200. Specifically, the value of H3 can be any value from 30, 200, 50, 70, 90, 110, 130, 150, 170, 200, or any value within a range of any two values. When the value of H3 is within the above range, the dimensions of the control board 41 in the third direction Z are adapted to the dimensions of the housing 10 in the third direction Z, thereby enabling the control board 41 to fully utilize the space inside the housing 10 in the third direction Z and improving the utilization rate of the internal space of the housing 10.

[0059] In some embodiments, the control board 41 includes a main control board and a slave control board. The main control board is disposed in the receiving cavity 11 of the housing 10, and the slave control board is disposed outside the housing 10 and arranged in the box 30. By only disposing of the main control board in the housing 10, the space ratio of the control board 41 in the housing 10 in the second direction Y can be reduced, thereby minimizing the width W of the housing 10 in the second direction Y, and further reducing the space ratio of the housing 10 in the box 30 in the second direction Y, improving the space utilization rate of the box 30 in the second direction Y, and improving the energy density of the battery pack 100.

[0060] In some embodiments, both the main control board and the slave control board are disposed in the receiving cavity 11 of the housing 10. The main control board, the slave control board and the electrical components 20 are spaced apart along the second direction Y. Although this increases the width W of the housing 10 in the second direction Y, the BMS can be integrated into the receiving cavity 11 of the housing 10, avoiding the battery management unit 40 occupying too much space inside the housing 30, ensuring the space ratio of the battery pack 60 inside the housing 30, and ensuring the energy density of the battery pack 100.

[0061] The battery management unit 40 monitors the battery pack 60 in the battery pack 100 via a signal harness. The slave control board is responsible for measuring parameters such as voltage, current, and temperature of the battery pack 60 and then transmitting them to the main control board. The main control board is responsible for evaluating the data transmitted by the slave control board. If the data is abnormal, it protects the slave control board by issuing a request to reduce the current or by cutting off the charging and discharging path through a relay in the electrical component 20 to prevent the battery pack 60 from exceeding its permissible operating conditions. It also manages the charge and temperature of the battery pack 60.

[0062] In some embodiments, refer to Figures 1-6 The electrical component 20 includes a plurality of relays 21, which are spaced apart along a first direction X, as shown in the figure. Figure 7 The relay 21 has a first surface 211 and a second surface 212 disposed opposite to each other in a third direction Z. The relay 21 has at least two connection ends 213, which are spaced apart on the first surface 211 along a first direction X. Specifically, as shown... Figure 7In the illustrated embodiment, the relay 21 has two connection terminals 213, including a first connection terminal 2131 and a second connection terminal 2132, as detailed below. Figures 1-6 In the embodiment shown, the plurality of relays 21 include a main positive relay 21a and a main negative relay 21b. The main positive relay 21a and the main negative relay 21b are spaced apart along the first direction X in the receiving cavity 11 of the housing 10, thereby making full use of the space of the housing 10 in the first direction X and reducing the width W of the housing 10 in the second direction Y.

[0063] Reference Figures 1-2 The battery pack 100 also includes multiple conductive busbars 50. The first connection terminal 2131 of the main positive relay 21a is electrically connected to the positive terminal of the battery pack 60 via a conductive busbar 50, and the second connection terminal 2132 of the main negative relay 21b is electrically connected to the negative terminal of the battery pack 60 via a conductive busbar 50, as detailed below. Figures 1-6 In the embodiment shown, the conductive bus 50 includes a first conductive bus 51 and a second conductive bus 52. The first connection terminal 2131 of the main positive relay 21a is electrically connected to the positive terminal of the battery pack 60 through the first conductive bus 51. The first conductive bus 51 penetrates the second side wall 102 of the housing 10 along the second direction Y. The second connection terminal 2132 of the main negative relay 21b is electrically connected to the negative terminal of the battery pack 60 through the second conductive bus 52. The second conductive bus 52 penetrates the second side wall 102 of the housing 10 along the second direction Y.

[0064] Reference Figure 1 and Figure 2 The conductive bus 50 also includes a third conductive bus 53 and a fourth conductive bus 54. The third conductive bus 53 extends along the second direction Y. One end of the third conductive bus 53 is electrically connected to the second connection terminal 2132 of the main positive relay 21a, and the other end extends to the outside of the first sidewall 101 to be electrically connected to an external device. The fourth conductive bus 54 extends along the second direction Y. One end of the fourth conductive bus 54 is electrically connected to the first connection terminal 2131 of the main negative relay 21b, and the other end extends to the outside of the first sidewall 101 to be electrically connected to an external device.

[0065] Reference Figures 2-6 The relay 21 also includes a fast charging relay 21c, which is disposed between the main positive relay 21a and the main negative relay 21b. The main positive relay 21a, the fast charging relay 21c and the main negative relay 21b are spaced apart along the first direction X. The main positive relay 21a and the main negative relay 21b are used to control the on / off of the high voltage circuit in the BDU, and the fast charging relay 21c is used to control the on / off of the fast charging circuit in the BDU.

[0066] Reference Figures 1-2 as well as Figures 5-6The electrical component 20 also includes a current sensor 22. The current sensor 22, the main positive relay 21a, and the main negative relay 21b are spaced apart along a first direction X within the receiving cavity 11 of the housing 10. The current sensor 22 is a Hall effect sensor. (See reference...) Figures 1-4 Electrical component 20 also includes a pre-charge relay 23 and a pre-charge resistor 24, specifically as follows: Figures 1-2 In the illustrated embodiment, the pre-charge relay 23 and the pre-charge resistor 24 are spaced apart along the second direction Y in the receiving cavity 11 of the housing 10, thereby making full use of the space inside the housing 10 in the second direction Y, specifically as follows: Figure 3 and Figure 4 In the illustrated embodiment, the pre-charge relay 23 and the pre-charge resistor 24 are spaced apart along the first direction X within the receiving cavity 11 of the housing 10, thereby fully utilizing the space in the first direction X. The arrangement of the pre-charge relay 23 and the pre-charge resistor 24 enables the BDU to have a pre-charge function, improving the safety of the battery pack 100. (Refer to...) Figures 3-6 Electrical component 20 also includes a fuse 25. The main positive relay 21a, fuse 25, fast-charging relay 21c, and main negative relay 21b are spaced apart along the first direction X within the receiving cavity 11 of the housing 10. The fuse 25 is used to disconnect when the current in the charging / discharging circuit of the BDU exceeds a specified value and remains there for a sufficiently long time, to prevent excessive current in the charging / discharging circuit from adversely affecting the battery pack. (Refer to...) Figure 3 and Figure 4 The electrical component 20 also includes a shunt 26, a main positive relay 21a, a fuse 25, a fast charging relay 21c, a main negative relay 21b, and the shunt 26 are spaced apart along the first direction X in the receiving cavity 11 of the housing 10. The shunt 26 is used to convert the operating current of the battery pack 60 into a shunt voltage.

[0067] Reference Figures 3-6 The battery pack 100 also includes a connector 70, specifically as follows: Figures 3-6 In the illustrated embodiment, connector 70 includes a fast charging connector 71, a drive connector 72, and a signal connector 73, specifically as follows: Figures 3-4 In the illustrated embodiment, the drive connector 72, fast charging connector 71, and signal connector 73 are spaced apart along the first direction X on the first sidewall 101 of the housing 10, specifically as follows: Figures 5-6In the illustrated embodiment, the drive connector 72 and the fast charging connector 71 are spaced apart along the first direction X on the first sidewall 101 of the housing 10, and the signal connector 73 is disposed on the third sidewall 103 of the housing 10. In some implementations, the first connection terminal 2131 of the fast charging relay 21c is electrically connected to the positive terminal of the fast charging connector 71 via a conductive busbar, the second connection terminal 2132 of the fast charging relay 21c is electrically connected to the negative terminal of the fast charging connector 71 via a conductive busbar, the second connection terminal 2132 of the main positive relay 21a is electrically connected to the positive terminal of the drive connector 72 via a conductive busbar, and the first connection terminal 2131 of the main negative relay 21b is electrically connected to the negative terminal of the drive connector 72 via a conductive busbar.

[0068] The present application will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed in the present application.

[0069] Example 1

[0070] A battery pack 100 is provided, including a housing 30 and a casing 10. The casing 10 is disposed in the housing 30, and a plurality of electrical components 20 are disposed inside the casing 10. The plurality of electrical components 20 include a main positive relay 21a, a main negative relay 21b, a fast charging relay 21c, a current sensor 22, a pre-charge relay 23, and a pre-charge resistor 24. The current sensor 22, the main positive relay 21a, the pre-charge relay 23, and the main negative relay 21b are spaced apart along a first direction X in the receiving cavity 11 of the casing 10. The pre-charge relay 23 and the pre-charge resistor 24 are spaced apart along a second direction Y. A control board 41 is disposed in the casing 10, and the control board 41 is spaced apart from the current sensor 22, the main positive relay 21a, the pre-charge relay 23, and the main negative relay 21b along the second direction Y.

[0071] Along the first direction X, the distance between the opposite sides of the third sidewall 103 and the fourth sidewall 104 of the housing 10 is L1, L1 = 400. The distance between the opposite faces of the two end walls of the box 30 arranged opposite each other in the first direction X is L1, L2 = 1500, L1 / L2 = 0.2667. Along the second direction Y, the distance between the opposite sides of the first sidewall 101 and the second sidewall 102 of the housing 10 is W, W = 150, L1 / W = 2.67. Along the third direction Z, the height of the housing 10 is H1 = 80, the height of the box 30 is H2 = 80, H1 / H2 = 1.

[0072] Examples 2-33

[0073] The battery pack 100 described in Example 1 is provided, except for the following differences, and is otherwise the same as in Example 1:

[0074] Adjust the dimensions L1 of the housing 10 in the first direction X, W in the second direction Y, and H1 in the third direction Z. Adjust the dimensions L2 of the box 30 in the first direction X and H2 in the third direction Z. Refer to Table 1 for details.

[0075] Comparative Examples 1-4

[0076] The battery pack 100 described in Example 1 is provided, except for the following differences, and is otherwise the same as in Example 1:

[0077] Adjust the dimensions L1 of the housing 10 in the first direction X, W in the second direction Y, and H1 in the third direction Z. Adjust the dimensions L2 of the box 30 in the first direction X and H2 in the third direction Z. Refer to Table 1 for details.

[0078] Relevant size testing methods:

[0079] The dimensions of the casing 10 and the box 30 in the battery packs provided in Examples 1 to 33 and Comparative Examples 1 to 4 were measured using length measuring tools such as tape measure, caliper, and ruler.

[0080] Battery pack energy density testing method:

[0081] The energy density of the battery packs provided in Examples 1-33 and Comparative Examples 1-4 was tested using the following methods, and the test results are shown in Table 1:

[0082] Energy density = Total energy of battery pack / Total weight of battery pack.

[0083] 1) Under an environment of 25℃±2℃, the battery pack is discharged at a constant current of 1 / 3C until the voltage of any single battery cell in the battery pack reaches the discharge cutoff voltage.

[0084] 2) Let stand for 30 minutes, and the maximum temperature of a single unit should be less than 30℃;

[0085] 3) Perform standard charging of the battery pack at an environment of 25℃±2℃;

[0086] 4) Let stand for 30 minutes, and the maximum temperature of a single unit should be less than 30℃;

[0087] 5) Under an environment of 25℃±2℃, the battery pack is discharged at a constant current of 1 / 3C until the voltage of any single battery cell reaches the discharge cutoff voltage, and the discharge energy E (in Wh) is recorded.

[0088] 6) Let stand for 30 minutes, and the maximum temperature of a single unit should be less than 30℃;

[0089] 7) Repeat steps 3) to 6) twice, and take the average value of the three discharge energies E;

[0090] 8) Measure the total mass M of the battery pack (in kg, including at least the components specified in Appendix A.1 of GB / T 31467.3-2015, excluding the test harness outside the battery pack and the coolant on the liquid cooling plate).

[0091] 9) Calculate the discharge energy density of the test object (in Wh / kg). Energy density = total energy of battery pack / total weight of battery pack.

[0092] Table 1

[0093]

[0094]

[0095] As shown in Table 1, referring to Embodiments 1 to 5, with other dimensions of the housing 10 and the box 30 remaining unchanged, as the dimension L1 of the housing 10 in the first direction X increases, the ratio L1 / W between L1 and the length W of the housing 10 in the second direction Y increases accordingly, and the energy density of the battery pack 100 shows an increasing trend. This is because when the housing 10 is arranged in the box 30, the space of the box 30 in the first direction X can be fully utilized, improving the space utilization rate inside the box 30, thereby increasing the energy density of the battery pack 100.

[0096] Referring to embodiments 6-10, with other dimensions of the housing 10 and the box 30 remaining unchanged, as the length W of the housing 10 in the second direction Y increases, L1 / W decreases, and the energy density of the battery pack 100 shows a decreasing trend. This is because when the housing 10 is arranged in the box 30, as W increases, the space occupied by the housing 10 in the second direction Y inside the box 30 increases, which in turn leads to a decrease in the space occupied by the battery pack 60 in the second direction Y of the box 30, resulting in a decreasing trend in the energy density of the battery pack 100.

[0097] Referring to embodiments 11-15, with other dimensions of the housing 10 and the box 30 remaining unchanged, as the length L2 of the box 30 in the first direction X increases, the ratio L1 / L2 tends to decrease, and the energy density of the battery pack 100 tends to decrease. This is because when the housing 10 is arranged in the box 30, as L2 increases, the space inside the box 30 in the first direction X increases, and the ratio L1 / L2 tends to decrease, which reduces the space utilization rate of the housing 10 in the first direction X, thereby causing the energy density of the battery pack 100 to decrease.

[0098] Referring to embodiments 16-20, with other dimensions of the housing 10 and the box 30 remaining unchanged, as the height H2 of the box 30 in the third direction Z increases, the ratio H1 / H2 of the height H1 of the housing 10 in the third direction Z shows a decreasing trend, and the energy density of the battery pack 100 shows a decreasing trend. The reason is that when the housing 10 is arranged in the box 30, as H2 increases, the space inside the box 30 in the third direction Z increases, and H1 / H2 shows a decreasing trend, which reduces the space utilization rate of the housing 10 in the third direction Z, thereby causing the energy density of the battery pack 100 to show a decreasing trend.

[0099] Referring to embodiments 21-25, with other dimensions of the housing 10 and the box 30 remaining unchanged, as the height H1 of the housing 10 in the third direction Z increases, the ratio of H1 / H2 shows an upward trend, and the energy density of the battery pack 100 shows an upward trend. This is because when the housing 10 is arranged in the box 30, as H1 increases, the space occupied by the housing 10 in the third direction Z inside the box 30 increases, and H1 / H2 shows an upward trend. This allows the housing 10 to make full use of the space in the third direction Z inside the box 30, thereby increasing the space utilization rate of the box 30 in the third direction Z, which in turn leads to an upward trend in the energy density of the battery pack 100.

[0100] Referring to Embodiments 26 and 10, in the battery pack 100 provided in Embodiment 26, the dimension L1 of the housing 10 in the first direction X exceeds the upper limit of 400 to 1300 defined in the embodiments of this application, and L1 / W also exceeds the upper limit of 2.67 to 32.5. As a result, when the housing 10 is disposed in the housing 30, the housing 10 occupies too much space inside the housing 30 in the first direction X, resulting in the energy density of the battery pack 100 provided in Embodiment 26 being lower than the energy density of the battery pack 100 provided in Embodiment 10.

[0101] Referring to Embodiments 27 and 4, in the battery pack 100 provided in Embodiment 27, the dimension W of the housing 10 in the second direction Y exceeds the upper limit of 40 to 150 defined in the embodiments of this application, which in turn causes L1 / W to be lower than the lower limit of 2.67 to 32.5. As a result, when the housing 10 is arranged in the housing 30, the housing 10 occupies too much space inside the housing 30 in the second direction Y, which causes the space occupied by the battery pack 60 in the battery pack 100 provided in Embodiment 27 to be smaller in the second direction Y, which in turn causes the energy density of the battery pack 100 provided in Embodiment 27 to be lower than the energy density of the battery pack 100 provided in Embodiment 4.

[0102] Referring to Embodiments 28 and 6, in the battery pack 100 provided in Embodiment 28, the dimension W of the housing 10 in the second direction Y is lower than the lower limit of 40 to 150 defined in the embodiments of this application, causing the L1 / W ratio to exceed the upper limit of 2.67 to 32.5. As a result, when the housing 10 is arranged in the housing 30, the space occupied by the housing 10 in the second direction Y of the housing 30 is too small. Consequently, the space occupied by the housing 10 in the second direction Y of the battery pack 100 provided in Embodiment 28 is smaller, and the space for the electrical components inside the housing 10 is less. This affects the control of the electrical components over the individual battery cells in the battery pack 60, thereby causing the energy density of the battery pack 100 provided in Embodiment 28 to be lower than that of the battery pack 100 provided in Embodiment 6.

[0103] Referring to Embodiments 29 and 15, in the battery pack 100 provided in Embodiment 29, the length L2 of the housing 30 in the first direction X exceeds the upper limit of 800 to 1500 as defined in the embodiments of this application, and the ratio of L1 / L2 is lower than the lower limit of 0.5 to 1. This results in the housing 30 being too large in the first direction X, causing a waste of space inside the housing 30 in the first direction X, and a decrease in the space utilization rate inside the housing 30 in the first direction X. Consequently, the energy density of the battery pack 100 provided in Embodiment 29 is lower than the energy density of the battery pack 100 provided in Embodiment 15.

[0104] Referring to Embodiments 29-30 and Embodiment 15, the length L2 of the housing 30 in the first direction X of the battery pack 100 provided in Embodiment 30 exceeds the upper limit of 800-1500 defined in the embodiments of this application, but is lower than the size of the housing 30 in the first direction X of the battery pack 100 provided in Embodiment 29. Compared with Embodiment 29, the space utilization rate of the housing 30 in the first direction X is improved, thereby resulting in the energy density of the battery pack 100 provided in Embodiment 30 being higher than that of the battery pack 100 provided in Embodiment 29, but still lower than that of the battery pack 100 provided in Embodiment 15.

[0105] Referring to Embodiments 31 and 15, in the battery pack 100 provided in Embodiment 31, the height H1 of the housing 10 in the third direction Z is lower than the lower limit value of 80-200 defined in the embodiments of this application. As a result, when the housing 10 is arranged in the housing 30, the space occupied by the housing 10 in the third direction Z in the battery pack 100 provided in Embodiment 31 is too small, which leads to a decrease in the space utilization rate of the housing 30 in the third direction Z, and thus the energy density of the battery pack 100 provided in Embodiment 31 is lower than that of the battery pack 100 provided in Embodiment 15.

[0106] Referring to Embodiments 31-32 and Embodiment 22, the height H2 of the battery pack 100 in Embodiment 32 in the third direction Z exceeds the upper limit of 80-200 as defined in the embodiments of this application. This results in an excessively large space inside the housing 30 in the third direction Z, leading to a low space utilization rate inside the housing 30 in the third direction Z. With the ratio of H1 / H2 both being 0.6, the energy density of the battery pack 100 provided in Embodiment 32 is lower than that of the battery pack 100 provided in Embodiment 31, and significantly lower than that of the battery pack 100 in Embodiment 22.

[0107] Referring to Embodiments 32-33 and Embodiment 20, in the battery pack 100 provided in Embodiment 33, the height H2 of the housing 30 in the third direction Z exceeds the upper limit of 80-200 defined in the embodiments of this application. This results in an excessively large internal space of the housing 30 in the third direction Z, which is also higher than the height H2 of the housing 30 in the third direction Z in the battery pack 100 provided in Embodiment 32. Consequently, the ratio of H1 / H2 is lower than the lower limit of 0.5-1 defined in the embodiments of this application, and also lower than the H1 / H2 ratio in the battery pack 100 provided in Embodiment 20. Therefore, the battery pack 100 provided in Embodiment 33... The space utilization rate inside the housing 30 in the third direction Z is too low. The energy density of the battery pack 100 provided in embodiment 33 is lower than that of the battery pack 100 provided in embodiment 22. However, since the H1 / H2 ratio in the battery pack 100 provided in embodiment 32 is higher than that in embodiment 22, although the height H2 of the housing 30 in the third direction Z in the battery pack 100 provided in embodiment 32 exceeds the upper limit, the energy density of the battery pack 100 provided in embodiment 32 is higher than that of the battery pack 100 provided in embodiment 22 because the space utilization rate in the third direction Z is higher than that in embodiment 22.

[0108] In contrast, in Comparative Examples 1 and 2, the size L1 of the housing 10 in the first direction X of the battery pack provided by Comparative Examples 1 and 2 is only 300, which is lower than the lower limit of 400 to 1300 defined in the embodiments of this application. This results in the size of the housing 10 in the first direction X of Comparative Examples 1 and 2 being too small, which in turn results in the energy density of the battery pack provided by Comparative Examples 1 and 2 being too low.

[0109] In contrast, in Comparative Example 3, the size W of the housing 10 in the second direction Y of the battery pack provided by Comparative Example 3 far exceeds the upper limit of 40 to 150 defined in the embodiments of this application, and the value of L1 / W is lower than the lower limit of 2.67 to 32.5 defined in the embodiments of this application. As a result, the housing 10 in the battery pack of Comparative Example 3 occupies too much space inside the housing 30 in the second direction Y, which restricts the space of the battery pack 60 in the second direction Y. The space utilization rate inside the housing 30 in the second direction Y is low, resulting in a low energy density of the battery pack provided by Comparative Example 3.

[0110] In contrast, in Comparative Example 4, the height H1 of the casing 10 in the third direction Z of the battery pack provided by Comparative Example 4 is significantly lower than the lower limit of 80-200 defined in the embodiments of this application. This results in the H1 / H2 ratio being significantly lower than the lower limit of 0.5-1 defined in the embodiments of this application. This indicates that the space utilization rate inside the casing 30 in the third direction Z of the battery pack provided by Comparative Example 4 is too low, which in turn leads to the low energy density of the battery pack provided by Comparative Example 4.

[0111] The technical solutions provided by the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery pack, characterized in that, Includes a cutting unit, the cutting unit comprising: A housing having a receiving cavity inside, the housing having a first direction and a second direction perpendicular to each other, the housing having a length L1 mm in the first direction and a length W mm in the second direction, satisfying: 2.67≤L1 / W≤37.5; Multiple electrical components are spaced apart in the receiving cavity along the first direction.

2. The battery pack as described in claim 1, characterized in that, The battery pack satisfies the following condition: 5.33≤L1 / W≤21.

6.

3. The battery pack as described in claim 1, characterized in that, The battery pack also includes a housing, and the casing is disposed in the housing. The housing has a length L2 mm in the first direction, satisfying: 0.5≤L1 / L2≤1.

4. The battery pack as described in claim 3, characterized in that, 400≤L1≤1300, and / or, 800≤L2≤1500.

5. The battery pack as described in claim 1, characterized in that, The battery pack also includes a housing, and the housing has a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other; The housing has a height H1 mm in the third direction; The enclosure has a height H2 mm in the third direction; It satisfies: 0.5≤H1 / H2≤1.

6. The battery pack as described in claim 5, characterized in that, 80≤H1≤200, and / or, 80≤H2≤200.

7. The battery pack as described in claim 1, characterized in that, 40≤W≤150, and / or, 400≤L1≤1300.

8. The battery pack as claimed in claim 1, characterized in that, The battery pack also includes a battery management unit, which includes a control board disposed in the receiving cavity and electrically connected to the electrical components; The control board and the electrical components are arranged at intervals along the second direction.

9. The battery pack as described in claim 8, characterized in that, The control board has a length L3 mm in the first direction; the control board has a height H3 mm in the third direction; It satisfies: 0.5≤L3 / H3≤33.3, and / or, 1≤H2 / H3≤6.

7.

10. The battery pack as claimed in claim 9, characterized in that, The battery pack satisfies: 5.0≤L3 / H3≤25.0, and / or, 2≤H2 / H3≤5.

11. The battery pack as claimed in claim 9, characterized in that, 100≤L3≤1000, 30≤H3≤200.

12. The battery pack as claimed in claim 1, characterized in that, The electrical component includes a plurality of relays, which are spaced apart along the first direction. Each relay has a first surface and a second surface disposed opposite to each other in a third direction. Each relay has at least two electrical connection terminals, which are spaced apart on the first surface along the first direction. The plurality of relays includes main positive relays and main negative relays arranged at intervals along the first direction; The battery pack also includes multiple conductive busbars; The battery pack also includes a battery assembly, which is disposed within the housing; The at least two electrical connection terminals include a first connection terminal and a second connection terminal; The first connection terminal on the main positive relay is electrically connected to the positive terminal of the battery pack through a conductive busbar. The second connection terminal on the main negative relay is electrically connected to the negative terminal of the battery pack via a conductive busbar.

13. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 12.

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