Battery pack

Abstract

The invention relates to a battery pack, which comprises a battery box body, a plurality of battery monomers, a battery cut-off unit, a battery management system and a battery box cover, the plurality of battery monomers, the battery cut-off unit, the battery management system and the battery box cover are sequentially arranged in the battery box body along a first direction, and the battery box cover comprises a main cover and a second cover, the first cover and the second cover are sequentially arranged along a first direction corresponding to the plurality of single batteries and are connected with the battery box body, so that the first cover and the second cover jointly seal the open end of the battery box body, and the first direction is the length direction of the battery box body; the electric appliance bin is detachably mounted on one side, deviating from the battery box body, of the first cover in the second direction; the electric appliance bin is arched towards one side far away from the first cover in the second direction to form a first accommodating space, a communication opening is formed in the first cover, and the first accommodating space is communicated with the battery box body through the communication opening; the second direction is the height direction of the battery box body; wherein the first accommodating space is used for accommodating and hoisting the battery cut-off unit.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery pack. Background Art

[0002] With the rapid expansion and development of the new energy market, the market share of new energy vehicles has gradually increased. As a result, power batteries, as the core components of new energy vehicles, are increasingly used in people's lives. As people's requirements for the energy density of power batteries become higher and higher, it is necessary to further improve the space utilization inside the power battery.

[0003] In traditional technology, the electrical control unit is often assembled inside the battery case, taking up a large space, thereby limiting the effective space provided by the battery case to the battery cells. As a result, a battery case of a specific size can accommodate fewer battery cells or the size of the battery case is larger when accommodating the same number of battery cells, which limits the improvement of the energy density of the power battery. Summary of the invention

[0004] Based on this, it is necessary to provide a battery pack that can improve the battery energy density to address the problem that the battery box in traditional technology provides a small effective space for the battery cells, which limits the improvement of the power battery energy density.

[0005] In one aspect, the present application provides a battery pack, comprising a battery case, a plurality of battery cells arranged in sequence along a first direction within the battery case, a battery disconnect unit, a battery management system, and a battery case cover, wherein the battery case cover comprises:

[0006] a main cover, comprising a first cover and a second cover that are detachably connected, wherein the first cover and the second cover are arranged in sequence along the first direction corresponding to the plurality of battery cells and are both connected to the battery case so as to be jointly sealed at the open end of the battery case by the first cover and the second cover, wherein the first direction is the length direction of the battery case;

[0007] an electrical appliance compartment detachably mounted on a side of the first cover facing away from the battery case in a second direction; the electrical appliance compartment arches in the second direction toward a side away from the first cover to form a first receiving space; the first cover is provided with a communication port, and the first receiving space is connected to the battery case through the communication port; the second direction is a height direction of the battery case;

[0008] The first receiving space is used to receive and hoist the battery disconnection unit.

[0009] In one embodiment, a portion of the first cover is overlapped along the second direction on a side of the second cover facing away from the battery box;

[0010] The battery box cover further includes a sealant layer, and the sealant layer is disposed along the second direction to seal the position between the overlapping regions of the first cover and the second cover.

[0011] In one embodiment, an overflow groove is provided on the second cover. The overflow groove is distributed at both ends of the sealant layer along the first direction, and the overflow groove extends along the third direction, where the third direction is the width direction of the battery box body.

[0012] In one embodiment, the battery box cover further includes a plurality of first fasteners. The plurality of first fasteners are arranged in sequence along the third direction and penetrate through the second cover, the sealant layer and the first cover along the second direction to fix the three, and are located between the two overflow grooves.

[0013] In one embodiment, the first fastener includes a fastening screw, a sealing ring and a fastening nut. Along the second direction, the fastening screw penetrates through the first cover through the second cover, and the fastening nut is screwed onto one end of the fastening screw that penetrates through the first cover. The sealing ring is sleeved outside the fastening screw and clamped between the fastening nut and the first cover.

[0014] In one embodiment, the sealing ring includes a rigid part and an elastic part. An annular groove is provided in the elastic part, and the rigid part is embedded in the annular groove;

[0015] Both the rigid part and the elastic part are sleeved outside the fastening screw, and the elastic part is clamped between the fastening nut and the first cover.

[0016] In one embodiment, the battery box cover further includes a second fastener, and the electrical appliance compartment is connected to the first cover through the second fastener;

[0017] At a position of the second cover facing the second fastener, an inner arched portion is formed by arching away from the first cover along the second direction, and the inner arched portion is used to avoid the second fastener.

[0018] In one embodiment, a bracket is provided on the first cover. The electrical appliance compartment and the bracket together form a second accommodation space, and the second accommodation space is communicated with the battery box body through the communication port;

[0019] The second accommodation space is used to accommodate the main control unit of the battery management system. The bracket is used to support the main control unit, and the second accommodation space and the first accommodation space are arranged at intervals along the third direction.

[0020] In one embodiment, a reinforcing rib is provided at one end of the first cover away from the second cover in the first direction.

[0021] In one embodiment, first flanges are provided on three sides of the first cover away from the second cover, second flanges are provided on three sides of the second cover away from the first cover, and one end of the first cover and the second cover close to each other partially overlaps, so that the first flanges and the second flanges partially overlap. Third fasteners respectively pass through the first flanges, the second flanges, and the overlapping positions of the first flanges and the second flanges to fix the first cover and the second cover to the battery box body.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] For the battery pack provided by the present application, since the battery cut-off unit is hoisted in the first accommodation space formed by the electrical compartment, compared with the prior art in which the battery cut-off unit is installed inside the battery box body, the space occupied by the electrical control unit in the battery box body is reduced, so that the effective space that the battery box body can provide for the battery cells is increased. As a result, the number of battery cells that can be accommodated in a battery box body of a specific size is increased, or the same number of battery cells can be accommodated in a battery box body with a smaller size, thereby improving the energy density of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of a battery pack provided by an embodiment of the present application;

[0025] Figure 2 is Figure 1 an exploded view of the battery pack shown in

[0026] Figure 3 is Figure 1 a structural diagram of the battery box cover of the battery pack shown in

[0027] Figure 4 is Figure 3 an exploded view of the battery box cover shown in Figure 4 (the electrical compartment is not shown in

[0028] Figure 5 is Figure 1 a structural diagram of the battery box body of the battery pack shown in

[0029] Figure 6 is Figure 1 an exploded view of the partial structure of the battery pack shown in

[0030] [[ID=!49]] Figure 7 is Figure 6 an assembly diagram of the structure shown in

[0031] Figure 8 is Figure 4 an enlarged view of part A of the structure shown in

[0032] Figure 9 for Figure 4 Assembly drawing of the structure shown in .

[0033] Description of reference numerals:

[0034] 1000, battery pack; 100, battery box cover; 10, main cover; 11, first cover; 111, bracket; 112, reinforcing rib; 113, communication port; 114, first body; 115, first side wall; 1151, first flange; 12, second cover; 121, overflow groove; 122, inner arch; 123, second body; 124, second side wall; 1241, second flange; 20, electrical compartment; 21, first receiving space; 30, sealant layer; 40, first fastener; 4 1. Fastening screw; 42. Sealing ring; 421. Rigid portion; 422. Elastic portion; 4221. Annular groove; 43. Fastening nut; 50. Second fastener; 200. Battery case; 201. Middle crossbeam; 202. Middle longitudinal beam; 203. Protruding structure; 300. Battery disconnect unit; 400. Main control unit; 500. Sealing gasket; 600. Battery cell; 700. Slave control unit; 800. Third fastener; X, first direction; Y, third direction; Z, second direction. DETAILED DESCRIPTION

[0035] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0037] In addition, 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 quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0038] In the present invention, unless otherwise clearly specified and defined, terms such as "installed", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0040] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0041] Refer to Figure 1 and Figure 2 , an embodiment of the present application provides a battery pack 1000, including a battery box body 200, battery cells 600 and a battery box cover 100. The battery cells 600 are disposed inside the battery box body 200, the battery box cover 100 is covered on the open end of the battery box body 200, and the battery box cover 100 and the battery box body 200 together form a receiving space for protecting the battery cells 600 located inside the battery box body 200.

[0042] Refer to Figure 3 andFigure 4 The battery box cover 100 includes a first cover 11 and a second cover 12 that are detachably connected. The first cover 11 and the second cover 12 are arranged in sequence along the first direction X and are both connected to the battery box body 200. The first cover 11 and the second cover 12 jointly close the open end of the battery box body 200. Specifically, both the first cover 11 and the second cover 12 face the battery cells 600 located inside the battery box body 200, that is, in the height direction of the battery box body 200, the projections of the first cover 11 and the second cover 12 at least partially overlap with the battery cells 600 to improve the space utilization rate. Among them, the first direction X is the length direction of the battery box body 200.

[0043] Continue to refer to Figure 2 The battery box body 200 further includes an electrical appliance compartment 20, and the electrical appliance compartment 20 is detachably installed on the side of the first cover 11 away from the battery box body 200 in the second direction Z. Since the first cover 11 and the second cover 12 are detachably connected, and the electrical appliance compartment 20 is detachably connected to the first cover 11, it is convenient to replace the first cover 11, the second cover 12 and the electrical appliance compartment 20 when they are damaged, and at the same time it is convenient to replace the components installed in the electrical appliance compartment 20 when they are damaged. Among them, the second direction Z is the height direction of the battery box body 200.

[0044] In some embodiments, continue to refer to Figure 4 The first cover 11 includes a first body 114 and three first side walls 115 provided on three side edges of the first body 114. The second cover 12 includes a second body 123 and three second side walls 124 provided on three side edges of the second body 123. One end of the first side wall 115 away from the first body 114 forms a first flanging 1151, and one end of the second side wall 124 away from the second body 123 forms a second flanging 1241. One end of the first body 114 and the second body 123 that are close to each other in the first direction X partially overlap, so that the first flanging 1151 and the second flanging 1241 partially overlap. The battery box body 200 includes a third fastener 800. The third fastener 800 respectively passes through the first flanging 1151, the second flanging 1241 and the overlapping position of the first flanging 1151 and the second flanging 1241 to fix the first cover 11 and the second cover 12 to the battery box body 200 to ensure the fixing effect of the first cover 11 and the second cover 12 to the battery box body 200; at the same time, improve the connection strength of the first cover 11 and the second cover 12, and improve the overall strength of the battery pack 1000. Optionally, the third fastener 800 is a fixing screw.

[0045] It can be seen that the main cover 10 formed by the above-mentioned first cover 11 and second cover 12 is a non-flat plate structure. After the first cover 11 and the second cover 12 are connected, the first body 114, the second body 123, the three first side walls 115 and the three second side walls 124 together form an accommodation space. In this way, the part of the battery cell 600 protruding from the battery box 200 can be accommodated in the accommodation space.

[0046] It can be conceived that in some other embodiments, the first side walls 115 and the second side walls 124 of the first cover 11 and the second cover 12 can also be omitted. For example, the first cover 11 and the second cover 12 are both arranged as flat plate structures, so that the entire main cover 10 is a flat plate structure, and the edge of the flat plate structure is connected to the battery box 200, which can improve the overall strength.

[0047] Continue to refer to Figure 2 , the battery pack 1000 further includes a sealing gasket 500, and the sealing gasket 500 is arranged between the main cover 10 and the battery box 200. Specifically, the sealing gasket 500 is arranged between the first cover 11 and the battery box 200 and between the second cover 12 and the battery box 200. The third fastener 800 passes through the first cover 11, the sealing gasket 500 and the battery box 200, and the third fastener 800 passes through the second cover 12, the sealing gasket 500 and the battery box 200 to realize the connection between the main cover 10 and the battery box 200 and ensure the sealing effect.

[0048] The third fastener 800 includes a fixing screw, and the fixing screw selected for the third fastener 800 is a high-strength screw to ensure that the first cover 11 and the second cover 12 are stable and do not shift when bearing weight and internal pressure.

[0049] Optionally, in the first direction X, the battery box 200 has a front end ( Figure 1 the right end in Figure 1 ) and a rear end ( the left end in ). The front end is the end where the battery box 200 is connected to the first cover 11, and the rear end is the end where the battery box 200 is connected to the second cover 12. The distance between the third fasteners 800 at the front end in the third direction Y is less than the distance between the third fasteners 800 at the rear end in the third direction Y, that is, the third fasteners 800 at the front end are more densely distributed than the third fasteners 800 at the rear end to ensure the fixing effect between the first cover 11 and the battery box 200. Among them, the third direction Y is the width direction of the battery box 200.

[0050] Refer to Figure 5, inside the battery box body 200, there are an intermediate cross beam 201 and an intermediate longitudinal beam 202. The intermediate longitudinal beam 202 extends along the first direction X and is located at the central position of the battery box body 200 along the third direction Y. The intermediate cross beam 201 extends along the third direction Y and is located at the central position of the battery box body 200 along the first direction X. The size of the first cover 11 in the first direction X is smaller than that of the second cover 12 in the first direction X. There is a convex structure 203 on the intermediate cross beam 201, and the second cover 12 is connected to the intermediate cross beam 201 through the convex structure 203, ensuring that the second cover 12 is firmly fixed on the intermediate cross beam 201 and increasing the overall rigidity of the structure.

[0051] Here, it should be noted that the length ratio of the first cover 11 and the second cover 12 in the first direction X needs to comprehensively consider the layout of the electrical control unit, the convenience of maintenance, and the overall structural strength. In order to realize the connection between the second cover 12 and the intermediate cross beam 201, the second cover 12 is longer than the first cover 11. Specifically, the length ratio of the second cover 12 to the first cover 11 is 1.2 - 1.8, but this needs to be calculated and adjusted in detail according to the actual application and the internal structure.

[0052] Furthermore, referring to Figure 2 and Figure 6 , the electrical appliance compartment 20 arches towards the side away from the first cover 11 in the second direction Z to form a first accommodation space 21. There is a communication port 113 on the first cover 11, and the first accommodation space 21 is communicated with the battery box body 200 through the communication port 113. Referring to Figure 6 and Figure 7 , the battery pack 1000 further includes a battery cut-off unit 300. The battery cut-off unit 300 is accommodated and hoisted in the first accommodation space 21. Specifically, the battery cut-off unit 300 is completely accommodated in the first accommodation space 21.

[0053] Here, it should be noted that the meaning of the battery cut-off unit 300 being accommodated and hoisted in the first accommodation space 21 is that the battery cut-off unit 300 is accommodated in the first accommodation space 21, and the battery cut-off unit 300 can be fixedly connected to the electrical appliance compartment 20. Optionally, after the battery cut-off unit 300 is installed, its connection with the plug-ins (such as high-voltage plug-ins) assembled on the electrical appliance compartment 20 is also completed. Since the first accommodation space 21 is communicated with the battery box body 200 through the communication port 113, after the battery cut-off unit 300 is installed in the first accommodation space 21, the battery cut-off unit 300 can be connected to the battery cells 600 located in the battery box body 200 through the communication port 113.

[0054] Among them, the battery disconnect unit 300 (abbreviated as BDU) is an important component in the battery pack 1000. It is mainly used to quickly disconnect the connection between the battery pack 1000 and the vehicle's electrical circuit in case of emergencies such as collisions and short circuits to prevent safety accidents.

[0055] With the above arrangement, since the battery disconnect unit 300 is hoisted in the first accommodation space 21 formed by the electrical compartment 20, compared with the prior art where the battery disconnect unit 300 is installed inside the battery box 200, the space occupied by the electrical control unit in the battery box 200 is reduced, enabling the battery box 200 to provide a larger effective space for the battery cells 600. As a result, the number of battery cells 600 that can be accommodated in a battery box 200 of a specific size is increased, or a battery box 200 of a smaller size can accommodate the same number of battery cells 600, thereby improving the energy density of the battery pack 1000.

[0056] When assembling the battery pack 1000, the first cover 11 and the second cover 12 can be first connected and jointly installed on the corresponding flange sealing surface of the battery box 200. The electrical compartment 20 provides the installation conditions for the battery disconnect unit 300. After fixing the battery disconnect unit 300 to the electrical compartment 20, the electrical compartment 20 is then installed on the corresponding flange surface of the first cover 11.

[0057] In some embodiments, continue to refer to Figure 2 , the first accommodation space 21 is arranged corresponding to a plurality of battery cells 600. That is, in the height direction of the battery box 200, the first accommodation space 21 is opposite to the battery cells 600. Just because the first accommodation space 21 is opposite to the battery cells 600, the battery disconnect unit 300 installed in the first accommodation space 21 is opposite to the battery cells 600. That is, the battery disconnect unit 300 is located above the battery cells 600 to avoid the arrangement of the battery disconnect unit 300 from lengthening the length of the battery pack 1000 in the first direction X. That is, such an arrangement has the effect of reducing the length dimension of the battery pack 1000, making the battery pack 1000 structurally compact and improving the energy density of the battery pack 1000. Specifically, the battery disconnect unit 300 is hoisted above the battery cells 600 and has a certain gap from the battery cells 600, ensuring the heat dissipation requirements and electrical safety of the battery disconnect unit 300, ensuring the electrical clearance and creepage distance, and preventing high-voltage arcs and electric leakage.

[0058] In some embodiments, continue to refer to Figure 4, part of the first cover 11 is overlapped along the second direction Z on the side of the second cover 12 facing away from the battery case 200, that is, the first body 114 is overlapped on the side of the second body 123 facing away from the battery case 200. The battery case cover 100 also includes a sealant layer 30, which is sealed along the second direction Z at a position between the overlapping areas of the first cover 11 and the second cover 12. By providing the sealant layer 30, the sealing effect of the first cover 11 and the second cover 12 is improved, so that the battery cells 600 located in the battery case 200 can be better protected. At the same time, the overlapping of the first cover 11 and the second cover 12 also improves the strength of the first cover 11 and the second cover 12, so as to facilitate the hoisting of the battery disconnection unit 300 and improve the overall reliability.

[0059] It should be understood that in some other embodiments, the sealant layer 30 between the first cover 11 and the second cover 12 may be omitted, which is not limited here.

[0060] For further information, see Figure 8 , the second cover 12 is provided with a glue overflow groove 121, and the glue overflow groove 121 is distributed at both ends of the sealant layer 30 along the first direction X, that is, in the first direction X, both ends of the sealant layer 30 are distributed with a glue overflow groove 121. Among them, the glue overflow groove 121 extends along the third direction Y. When the first cover 11 and the second cover 12 are coated with glue to form a seal of the sealant layer 30, the excess glue can overflow into the glue overflow groove 121, and the glue overflow groove 121 plays the role of accommodating excess glue. Through such a design, the uniformity of the sealant layer 30 can be improved. The uniform sealant layer 30 can not only improve the sealing performance, but also ensure the uniformity of the force between the first cover 11 and the second cover 12, and ensure the reliability of the connection between the two. At the same time, the glue overflow groove 121 can also simultaneously play the role of increasing the strength of the second cover 12, so as to improve the reliability of the second cover 12 and enable it to play the role of supporting the first cover 11.

[0061] Of course, in other embodiments, the glue overflow groove 121 may be omitted from the second cover 12 , which is not limited here.

[0062] The battery compartment cover 100 also includes a plurality of first fasteners 40, which are arranged sequentially along the third direction Y. Each of the first fasteners 40 is located between the two overflow grooves 121, and each first fastener 40 extends along the second direction Z through the second cover 12, the sealant layer 30, and the first cover 11, securing the three. The first fasteners 40 securely connect the first and second covers 11, 12, and, together with the sealant layer 30, ensure a strong seal between the first and second covers 11, 12, effectively preventing the intrusion of external factors such as dust and moisture, thereby extending the service life of the internal electrical control unit and battery cells 600.

[0063] Continue reading Figure 8, the first fastener 40 includes a fastening screw 41, a sealing ring 42 and a fastening nut 43. The fastening screw 41 passes through the second cover 12 and is inserted into the first cover 11 along the second direction Z. The fastening nut 43 is screwed onto one end of the fastening screw 41 that penetrates the first cover 11. The sealing ring 42 is sleeved outside the fastening screw 41 and clamped between the fastening nut 43 and the first cover 11. The fastening nut 43 plays a role in pressing the sealing ring 42. With such a setting method of the first fastener 40, not only the fixing effect on the first cover 11 and the second cover 12 is ensured; at the same time, under the action of the sealing ring 42, the sealing performance between the fastening screw 41 and the first cover 11 is ensured, and the sealing effect is better.

[0064] Since the fastening screw 41 passes through the second cover 12 and is inserted into the first cover 11, the head of the fastening screw 41 can be covered with sealant to ensure the sealing effect between the fastening screw 41 and the second cover 12. Moreover, the fastening screw 41 is in interference fit with the threaded holes on the first cover 11 and the second cover 12, that is, the threaded holes are slightly smaller than the diameter of the fastening screw 41. When the fastening screw 41 is screwed in, the material around the threaded hole is pressed and fitted against the fastening screw 41 to form a self-sealing effect.

[0065] Continue to refer to Figure 8 , the sealing ring 42 includes a rigid part 421 and an elastic part 422. An annular groove 4221 is provided in the elastic part 422, and the rigid part 421 is embedded in the annular groove 4221. Both the rigid part 421 and the elastic part 422 are sleeved outside the fastening screw 41, and the elastic part 422 is clamped between the fastening nut 43 and the first cover 11. Since the sealing ring 42 includes the rigid part 421 and the elastic part 422, when the fastening nut 43 presses the sealing ring 42, the rigid part 421 is used to evenly distribute the pressure, and the elastic part 422 deforms when pressed, filling the tiny gap between the fastening nut 43 and the first cover 11 to achieve an airtight effect.

[0066] Optionally, the rigid part 421 is made of a metal material, and the elastic part 422 is made of a rubber material to ensure that the rigid part 421 has sufficient rigidity and the elastic part 422 has sufficient elasticity to ensure the sealing effect. At the same time, the setting of the elastic part 422 can also solve the problem that the sealing ring 42 cannot rebound after aging and overpressure. It should be understood that in some other embodiments, the rigid part 421 and the elastic part 422 can also be made of other materials as long as they can cooperate with each other to achieve a better sealing effect.

[0067] In some embodiments, refer to Figure 9, the battery box cover 100 includes a second fastener 50, and the electrical appliance compartment 20 is connected to the first cover 11 by the second fastener 50. At a position of the second cover 12 facing the second fastener 50, an inner arched portion 122 is formed away from the inner arch of the first cover 11 along the second direction Z. The inner arched portion 122 is used to avoid the second fastener 50. The inner arched portion 122 not only serves to avoid the second fastener 50, but also can improve the strength of the second cover 12.

[0068] Optionally, the second fastener 50 includes a fastening screw, and the fastening screw passes through the electrical appliance compartment 20 and the first cover 11 to fix the two. The second fastener 50 is relatively long in the height direction, and the inner arched portion 122 is recessed downward, which can avoid the second fastener 50, save space in the height direction, and improve space utilization.

[0069] In some other embodiments, the second fastener 50 of the battery box cover 100 can also be omitted. At this time, the electrical appliance compartment 20 and the first cover 11 can be fixed by snap connection, which is convenient for the installation and disassembly of the electrical appliance compartment 20.

[0070] In some embodiments, continue to refer to Figure 9 , the first cover 11 is provided with a bracket 111, and the bracket 111 and the first body 114 define a communication port 113. The electrical appliance compartment 20 and the bracket 111 together form a second receiving space (refer to Figure 3 , the second receiving space is located Figure 3 below the reference numeral 20 in

[0071] With the above arrangement, since a second accommodation space is formed between the electrical appliance compartment 20 and the support 111, and the main control unit 400 of the BMS is accommodated in the second accommodation space, as compared with the prior art where the main control unit 400 of the BMS is installed inside the battery box body 200, the space of the battery box body 200 occupied by the electrical control unit is reduced, so that the effective space that the battery box body 200 can provide for the battery cells 600 is increased, thereby increasing the number or volume of the battery cells 600 that the battery box body 200 can accommodate, and improving the energy density of the battery pack 1000. At the same time, during installation, the main control unit 400 can be directly installed on the support 111, which facilitates the installation of the main control unit 400.

[0072] Since the electrical appliance compartment 20 is installed on the first cover 11, the battery cut-off unit 300 is hoisted in the first accommodation space 21 in the electrical appliance compartment 20, and the main control unit 400 is installed on the support 111, the weights of both the battery cut-off unit 300 and the main control unit 400 will be applied to the first cover 11. Further, referring to Figure 9 again, at one end of the first cover 11 away from the second cover 12 in the first direction X, there is a reinforcing rib 112. The reinforcing rib 112 can improve the strength of the first cover 11, so that the strength of the first cover 11 is sufficient to support the battery cut-off unit 300 and the main control unit 400.

[0073] Specifically, there are multiple reinforcing ribs 112. The multiple reinforcing ribs 112 extend along the second direction Z and are spaced from each other in the third direction Y. The cooperation of the multiple reinforcing ribs 112 can further improve the strength of the first cover 11 and ensure that the supporting strength of the first cover 11 is sufficient.

[0074] In some embodiments, the second accommodation space and the first accommodation space 21 are spaced along the third direction Y, and the second accommodation space corresponds to multiple battery cells 600. That is, in the height direction of the battery box body 200, the second accommodation space is opposite to the battery cells 600.

[0075] Precisely because the second accommodation space is opposite to the battery cells 600, the main control unit 400 installed in the second accommodation space is opposite to the battery cells 600. That is, the main control unit 400 is located above the battery cells 600, avoiding the main control unit 400 occupying the space of the battery box body 200, thereby increasing the arrangement number of the battery cells 600, with a compact structure and improving the energy density of the battery pack 1000. Specifically, the main control unit 400 has a certain gap from the battery cells 600 in the height direction of the battery box body 200, ensuring the heat dissipation requirement and electrical safety of the main control unit 400, ensuring the electrical clearance and creepage distance, and preventing high-voltage arcs and electric leakage. And when a thermal runaway occurs in the battery cells 600, the first accommodation space 21 and the second accommodation space respectively provide a certain degree of protection for the battery cut-off unit 300 and the main control unit 400.

[0076] Optionally, the communication port 113 faces both the battery cut-off unit 300 and the main control unit 400 in the height direction of the battery box body 200, and the communication port 113 also faces the slave control unit 700 of the battery management system located inside the battery box body 200. In this way, it is convenient for the battery cut-off unit 300 to communicate better with the battery cell 600 through the communication port 113, and it is convenient for the main control unit 400 to communicate better with the slave control unit 700 through the communication port 113, and at the same time, the space utilization rate can be taken into account.

[0077] It should be noted here that, generally speaking, continue to refer to Figure 2 , in the length direction of the battery box body 200, the slave control unit 700 is arranged at the end of the battery box body 200. That is, in the length direction of the battery box body 200, the slave control unit 700 is located between the battery cell 600 and the side wall of the battery box body 200. Specifically, the battery pack 1000 has a plurality of battery groups arranged along the third direction Y, and each battery group includes a plurality of battery cells 600 arranged along the first direction X. Each battery group is correspondingly provided with a slave control unit 700 at the end in the first direction X, and each slave control unit 700 is used to control the corresponding battery group.

[0078] Another embodiment of the present application also provides an electrical device, including the above-mentioned battery pack 1000. Since the above-mentioned battery pack 1000 has beneficial effects, the electrical device including the above-mentioned battery pack 1000 has the same beneficial effects, and will not be elaborated here in detail.

[0079] Optionally, the electrical device is a vehicle, and the vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.

[0080] It should be noted that for a pure electric vehicle, the above-mentioned battery can be used as a driving power source to replace fossil fuels to provide driving power.

[0081] In other embodiments, the type of the electrical device is not limited. For example, the electrical device can also be a ship, a spacecraft, an electric toy, an electric tool, an energy storage device, a amusement device, an elevator and a lifting device, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy or an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator and a planer, etc.; the energy storage device can be an energy storage wall, a base station energy storage, a container energy storage, etc.; the amusement device can be a carousel, a drop tower, etc. The present application does not impose special restrictions on the above-mentioned electrical devices.

[0082] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0083] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A battery pack, comprising a battery box body (200), a plurality of battery cells (600) arranged in sequence along a first direction (X) in the battery box body (200), a battery cut-off unit (300), a battery management system, and a battery box cover (100), characterized in that, The battery box cover comprises: A main cover (10) comprises a first cover (11) and a second cover (12) that are detachably connected, wherein the first cover (11) and the second cover (12) are arranged in sequence along the first direction (X) corresponding to a plurality of the battery cells and are both connected to the battery box (200) so as to be jointly sealed at the open end of the battery box (200) by the first cover (11) and the second cover (12), wherein the first direction (X) is the length direction of the battery box (200); The electrical appliance compartment (20) is detachably mounted on a side of the first cover (11) away from the battery box (200) in a second direction (Z); the electrical appliance compartment (20) is arched in the second direction (Z) toward a side away from the first cover (11) to form a first receiving space (21); the first cover (11) is provided with a communication port (113), and the first receiving space (21) is connected to the battery box (200) through the communication port (113); the second direction (Z) is the height direction of the battery box (200); The first receiving space (21) is used to receive and hoist the battery disconnection unit (300).

2. The battery pack according to claim 1, characterized in that, A portion of the first cover (11) is stacked along the second direction (Z) on a side of the second cover (12) facing away from the battery box (200); The battery box cover further comprises a sealing adhesive layer (30), wherein the sealing adhesive layer (30) is sealed along the second direction (Z) and arranged at a position between the overlapping areas of the first cover (11) and the second cover (12).

3. The battery pack according to claim 2, characterized in that, The second cover (12) is provided with a glue overflow groove (121), the glue overflow groove (121) is distributed at both ends of the sealant layer (30) along the first direction (X), and the glue overflow groove (121) extends along a third direction (Y), and the third direction (Y) is the width direction of the battery box (200).

4. The battery pack according to claim 3, characterized in that, The battery box cover further comprises a plurality of first fasteners (40), which are arranged in sequence along the third direction (Y), and penetrate the second cover (12), the sealant layer (30) and the first cover (11) along the second direction (Z) to fix the three, and are located between the two overflow glue grooves (121).

5. The battery pack according to claim 4, characterized in that, The first fastener (40) includes a fastening screw (41), a sealing ring (42) and a fastening nut (43). Along the second direction (Z), the fastening screw (41) is passed through the second cover (12) and is arranged in the first cover (11). The fastening nut (43) is screwed on one end of the fastening screw (41) passing through the first cover (11). The sealing ring (42) is sleeved on the outside of the fastening screw (41) and clamped between the fastening nut (43) and the first cover (11).

6. The battery pack according to claim 5, wherein The sealing ring (42) comprises a rigid portion (421) and an elastic portion (422); an annular groove (4221) is provided in the elastic portion (422); and the rigid portion (421) is embedded in the annular groove (4221); Both the rigid part (421) and the elastic part (422) are sleeved outside the fastening screw (41), and the elastic part (422) is clamped between the fastening nut (43) and the first cover (11).

7. The battery pack according to claim 2, characterized in that, The battery box cover further includes a second fastener (50), and the electrical appliance compartment (20) is connected to the first cover (11) through the second fastener (50); At a position of the second cover (12) facing the second fastener (50), an inner arched portion (122) is formed by arching away from the first cover (11) along the second direction (Z), and the inner arched portion (122) is used to avoid the second fastener (50).

8. The battery pack according to claim 1, characterized in that, The first cover (11) is provided with a bracket (111), and the electrical appliance compartment (20) and the bracket (111) together form a second accommodation space, and the second accommodation space is communicated with the battery box body (200) through the communication port (113); The second accommodation space is used to accommodate the main control unit (400) of the battery management system, the bracket (111) is used to support the main control unit (400), and the second accommodation space and the first accommodation space are arranged at intervals along the third direction (Y).

9. The battery pack according to claim 1, characterized in that, The first cover (11) is provided with a reinforcing rib (112) at one end away from the second cover (12) in the first direction (X).

10. The battery pack according to claim 1, characterized in that, The first cover (11) is provided with a first flanging (1151) on three sides away from the second cover (12), and the second cover (12) is provided with a second flanging (1241) on three sides away from the first cover (11). One end of the first cover (11) and the second cover (12) that are close to each other partially overlap, so that the first flanging (1151) and the second flanging (1241) partially overlap. The third fastener (800) respectively passes through the first flanging (1151), the second flanging (1241), and the overlapping position of the first flanging (1151) and the second flanging (1241) to fix the first cover (11) and the second cover (12) to the battery box body (200).

Images