Battery box and battery pack

Abstract

The utility model relates to a battery box and a battery pack. The battery box comprises a box body, a water blocking strip and a water accumulating groove, the box body is provided with an inner bottom surface, the water blocking strip is arranged on the inner bottom surface in a protruding mode and divides the inner bottom surface into a supporting area and a non-supporting area, and the supporting area is used for supporting a battery cell contained in the battery box. The water accumulation groove is concavely formed in the inner bottom surface, is positioned in the non-supporting area and is communicated with the inside and outside of the battery box; according to the technical scheme, condensate water generated in the battery pack can be stored in the water accumulation groove and discharged out of the battery box through the water accumulation groove. And meanwhile, the water blocking strip can prevent the condensed water in the water accumulating groove from flowing towards the battery cell, so that the influence of the condensed water on the insulating property of the battery cell is small, and the safety of the battery pack is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to battery boxes and battery packs. Background Art

[0002] In order to enable the battery to operate at an appropriate temperature, a thermal management system is usually provided inside the battery. The thermal management system can cool the battery and take away the battery heat in a high-temperature environment. Whether it is cooled by the thermal management system or the ambient temperature decreases, it is easy to condense condensed water inside the battery. The condensed water will affect the insulation performance of the battery cells inside the battery and reduce the battery safety. Summary of the Utility Model

[0003] Based on this, in view of the problem that the condensed water in the battery pack affects the insulation performance of the battery cells, a battery box and a battery pack are provided.

[0004] In a first aspect, this application provides a battery box, which includes:

[0005] A box body having an inner bottom surface;

[0006] A water-blocking strip protruding from the inner bottom surface and separating the inner bottom surface to form a support area and a non-support area, where the support area is used to support the battery cells accommodated in the battery box;

[0007] A water accumulation groove recessed in the inner bottom surface and located in the non-support area, and the water accumulation groove communicates the inside and outside of the battery box.

[0008] In some embodiments, the water-blocking strip includes a first water-blocking strip and a second water-blocking strip, the first water-blocking strip and the second water-blocking strip are arranged at intervals in a first direction, and water accumulation grooves are arranged on both sides facing away from each other;

[0009] The support area is located between the first water-blocking strip and the second water-blocking strip.

[0010] In some embodiments, the box body has an outer bottom surface opposite to the inner bottom surface, the water-blocking strip is recessed relative to the outer bottom surface to form a groove portion, and a reinforcing strip is embedded in the groove portion.

[0011] In some embodiments, the box body includes the insulating bottom lining, and one side surface of the insulating bottom lining serves as the inner bottom surface.

[0012] In some embodiments, the box body further includes the framework, and the framework is arranged on the side of the insulating bottom lining away from the inner bottom surface.

[0013] In some embodiments, the insulating bottom lining is a plate-like structure formed by bonding glass fiber and carbon fiber.

[0014] In some embodiments, the box body further includes a frame, and the frame is disposed around the outer periphery of the insulating bottom lining.

[0015] In some embodiments, the insulating bottom lining includes a supporting portion and a clamping portion. The supporting portion has the inner bottom surface, and the clamping portion is disposed at the edge of the supporting portion and is clamped and connected to the frame.

[0016] In some embodiments, the framework is disposed on the supporting portion.

[0017] In some embodiments, weight-reducing holes are formed in the clamping portion and the frame.

[0018] In some embodiments, the battery box further includes a supporting bar for supporting the battery cells, and the supporting bar is disposed in the supporting area.

[0019] In a second aspect, the present application provides a battery pack, including:

[0020] Battery cells;

[0021] And the battery box according to any one of the above embodiments, wherein the battery cells are located inside the battery box and are supported in the supporting area.

[0022] In some embodiments, each of the battery cells is coated with an insulating film;

[0023] The insulating film includes a flanging extending along the periphery of the bottom surface of the battery cell. The flanging covers a part of the bottom surface and encloses a window exposing the remaining part of the bottom surface.

[0024] In some embodiments, the width of the flanging is h, satisfying: h≥2 mm; wherein, the h refers to the dimension of the flanging in the direction perpendicular to its extending direction.

[0025] In some embodiments, the battery pack further includes an adhesive layer, and the adhesive layer is bonded between the bottom surface of the battery cell and the supporting area.

[0026] In some embodiments, the supporting area is provided with a supporting bar for supporting the bottom surface of the battery cell, and the supporting bar includes an edge supporting bar disposed close to the water blocking bar;

[0027] The adhesive layer includes an edge adhesive layer, and the edge adhesive layer blocks between the edge supporting bar and the water blocking bar.

[0028] In some embodiments, the battery pack includes multiple groups of battery cell groups, and the multiple groups of battery cell groups are arranged in sequence along a first direction. Each battery cell group includes multiple battery cells arranged in sequence along a second direction intersecting with the first direction.

[0029] In some embodiments, the battery pack further includes side plates, and each battery cell group is provided with the side plates on both sides in the first direction.

[0030] In some embodiments, the side plates are thermally connected to the battery cell groups for heat exchange with the battery cell groups.

[0031] For the above battery box and battery pack, the condensed water generated in the battery pack can be retained in the water accumulation tank and discharged from the battery box inside and outside through the water accumulation tank. At the same time, the water blocking strip can prevent the condensed water in the water accumulation tank from flowing towards the battery cells, and the influence of the condensed water on the insulation performance of the battery cells is small, which helps to improve the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0033] Figure 1 is a schematic external view of a battery box according to some embodiments.

[0034] Figure 2 is Figure 1 a schematic internal structure view of the battery box shown.

[0035] Figure 3 is Figure 2 an enlarged view of part A in

[0036] Figure 4 is Figure 2 an enlarged view of part B in

[0037] Figure 5 is a schematic internal structure view of a battery pack according to some embodiments.

[0038] Figure 6 is Figure 5 an enlarged view of part C in

[0039] Figure 7 is a schematic bottom structure view of a battery pack with the insulating bottom lining hidden according to some embodiments.

[0040] Figure 8 is a schematic external view of a battery cell according to some embodiments.

[0041] The reference numerals in the specific embodiments are as follows:

[0042] 100, Battery box; X, First direction; Y, Second direction; Z, Height direction; 10, Box body; 11, Insulating bottom lining; 11a, Support part; 11b, Clamping part; 12, Frame; 13, Upper cover; 14, Skeleton; N, Inner bottom surface; N1, Support area; N2, Non - support area; M, Outer bottom surface; q, Weight - reducing hole; 20, Water - blocking strip; 21, First water - blocking strip; 22, Second water - blocking strip; 20a, Groove part; 30, Water - collecting tank; 40, Reinforcing strip; 50, Support strip; 51, Edge support strip; 200, Battery cell; 201, Insulating film; 201a, Flange; k, Window; 200A, Battery cell group; 300, Side plate; 400, Adhesive layer; 401, Edge adhesive layer. Detailed implementation manners

[0043] To make the above - mentioned objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0044] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application 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. Therefore, it should not be construed as a limitation to the present application.

[0045] In addition, if there are terms such as "first" and "second", they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0046] In this application, unless otherwise clearly specified and defined, if the terms "installed", "connected", "joined", "fixed", etc. appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In this application, if it appears, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can 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 can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower horizontal level than the second feature.

[0048] It should be noted that if it appears, 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 only for the purpose of illustration and do not represent the only implementation.

[0049] In view of the problem that the condensed water in the battery pack easily affects the insulation performance of the battery cells, the embodiment of this application proposes a battery box. By arranging a water blocking strip and a water accumulation tank, the battery box can prevent the condensed water from flowing to the area where the battery cells in the battery box are located, reduce the influence of the condensed water on the insulation performance of the battery cells, and improve the safety of the battery.

[0050] The battery box in the embodiments of the present application can be used to prepare a battery pack. In addition to the battery box, the battery pack further includes battery cells disposed in the battery box. The battery cells can be prismatic cells, cylindrical cells, etc. The battery cell is also called a battery monomer and is the smallest unit for electrochemical reactions in the battery. In some examples, the battery cell includes a housing, and an electrode assembly and electrolyte accommodated in the housing. The housing can be an aluminum shell, a steel shell, etc., and the specific material is not limited. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator insulatingly disposed between the positive electrode plate and the negative electrode plate. The separator can be a separator membrane that allows ions to pass through. The electrode assembly can be a stacked structure or a wound structure. In some examples, a liquid injection hole for injecting the electrolyte into the housing is provided on the housing. Generally, a pole column is also provided on the housing, and the pole column is electrically connected to the electrode assembly to connect the electrode assembly to an external circuit.

[0051] First, the battery box in the embodiments of the present application will be introduced below.

[0052] Please refer to Figures 1 to 4 , the battery box 100 provided by the embodiments of the present application includes a box body 10, a water blocking strip 20, and a water accumulation groove 30. The box body 10 has an inner bottom surface N. The water blocking strip 20 protrudes from the inner bottom surface N and divides the inner bottom surface N into a support area N1 and a non-support area N2. The support area N1 is used to support the battery cells 200 accommodated in the battery box 100. The water accumulation groove 30 is recessed in the inner bottom surface N and is located in the non-support area N2. The water accumulation groove 30 communicates with the inside and outside of the battery box 100.

[0053] The inner bottom surface N is the inner surface of the box body 10 at the bottom. When the battery cells 200 are accommodated in the battery box 100, the battery cells 200 can be supported on the inner bottom surface N. The water blocking strip 20 can be integrally formed and protrude from the inner bottom surface N, or can be fixedly arranged on the inner bottom surface N in a split manner. The water blocking strip 20 can extend in a straight line direction, a curve direction, or a circumferential direction in a strip shape. Preferably, the water blocking strip 20 extends in a straight strip shape.

[0054] The water blocking strip 20 divides the inner bottom surface N into two areas. One of the areas is the support area N1 for supporting the battery cells 200; the other area is the non-support area N2, and a water accumulation groove 30 is formed in the non-support area N2. Generally, in order to improve the utilization rate of the internal space of the battery box 100, the area of the non-support area N2 is smaller than the area of the support area N1 to increase the number of battery cells 200 accommodated in the battery box 100. Generally but not limitedly, the non-support area N2 is arranged in the edge area of the inner bottom surface N, and the support area N1 is arranged in the middle area of the inner bottom surface N.

[0055] The water collecting trough 30 is recessed on the inner bottom surface N of the non-support area N2, and its trough bottom surface is lower than the inner bottom surface N of the box body 10 to collect condensed water. The water collecting trough 30 can be a straight trough, a curved trough, a circumferential trough, etc., without specific limitation. The water collecting trough 30 communicates inside and outside the battery box 100 to facilitate discharging the collected condensed water outside the battery box 100.

[0056] When the battery box 100 is applied to a battery pack, the condensed water generated in the battery pack can be retained in the water collecting trough 30 and discharged inside and outside the battery box 100 through the water collecting trough 30. At the same time, the water blocking strip 20 can block the condensed water in the water collecting trough 30 from flowing towards the direction of the battery cell 200, and the influence of the condensed water on the insulation performance of the battery cell 200 is small, which helps to improve the safety of the battery pack.

[0057] In some embodiments, referring to Figure 2 , Figure 3 and Figure 4 , the water blocking strip 20 includes a first water blocking strip 21 and a second water blocking strip 22. The first water blocking strip 21 and the second water blocking strip 22 are arranged at intervals in the first direction X, and water collecting troughs 30 are arranged on both sides facing away from each other. The support area N1 is located between the first water blocking strip 21 and the second water blocking strip 22.

[0058] The battery box 100 is generally in a cuboid shape. In the embodiments of the present application, the first direction X mentioned generally corresponds to the length of the battery box 100, the second direction Y generally corresponds to the width direction of the battery box 100, and the inner bottom surface N is the bottom surface in the height direction Z of the battery box 100.

[0059] The water blocking strip 20 includes a first water blocking strip 21 and a second water blocking strip 22 arranged at intervals in the first direction X. The inner bottom surface N area between the two is the support area N1, and all the battery cells 200 are arranged in the support area N1. Generally, the first water blocking strip 21 and the second water blocking strip 22 extend from one end of the inner bottom surface N in the second direction Y to the other end.

[0060] Water collecting troughs 30 are arranged in the non-support area N2 adjacent to the first water blocking strip 21 and the non-support area N2 adjacent to the second water blocking strip 22. At this time, the condensed water can be collected into the water collecting trough 30 from both sides of all the battery cells 200, improving the ability of the battery box 100 to collect condensed water. Moreover, water blocking strips 20 are arranged on both sides of all the battery cells 200, which can effectively prevent the condensed water in the water collecting trough 30 from flowing towards the battery cells 200, further reducing the probability of the battery cells 200 contacting the condensed water and improving the insulation of the battery cells 200.

[0061] Of course, in other embodiments, the water blocking strip 20 may also include a third water blocking strip, a fourth water blocking strip, etc. For example, the third water blocking strip and the fourth water blocking strip are arranged at intervals in the second direction Y, and are enclosed together with the first water blocking strip 21 and the second water blocking strip 22 at the periphery of a support area N1. Regarding the arrangement of the water blocking strip 20, those skilled in the art may flexibly arrange it, and it is not limited to the scheme in the above embodiment.

[0062] In some embodiments, reference Figure 3 and Figure 6 The box body 10 has an outer bottom surface M disposed opposite to the inner bottom surface N. The water blocking strip 20 is recessed relative to the outer bottom surface M to form a groove portion 20 a, and a reinforcing strip 40 is embedded in the groove portion 20 a.

[0063] That is to say, the water blocking strip 20 is convex relative to the inner bottom surface N and is also recessed relative to the outer bottom surface M. At this time, the cross-section of the water blocking strip 20 is roughly arched. In actual processing, the water blocking strip 20 that is integrally arranged can be obtained by stamping or mold forming on the bottom plate of the box body 10, and the water blocking strip 20 is easy to process.

[0064] A reinforcing strip 40 is embedded in the groove 20a formed by the water blocking strip 20, and the reinforcing strip 40 can strengthen the strength of the water blocking strip 20. Specifically, the reinforcing strip 40 can be, but is not limited to, made of metal. The reinforcing strip 40 is extended along the extension direction of the water blocking strip 20. One or more reinforcing strips 40 can be embedded in the groove 20a, and the specific number can be flexibly set.

[0065] In some embodiments, the box body 10 includes an insulating substrate 11, and one side surface of the insulating substrate 11 serves as an inner bottom surface N. The insulating substrate 11 has an insulating effect, and when the battery cell 200 is supported in the supporting area N1, the insulating substrate 11 can insulate the battery cell 200 from the outside, reduce the risk of leakage of the battery box 100, and improve the insulation performance of the battery cell 200 and the safety of the battery pack.

[0066] In some embodiments, reference Figure 3 The box 10 further includes a frame 14, which is disposed on the side of the insulating substrate 11 away from the inner bottom surface N. Specifically, the frame 14 is in a rod shape, a mesh shape, etc., which is disposed at the bottom of the insulating substrate 11, and can be fixed to the insulating substrate 11 by fastening, bonding, etc. The provision of the frame 14 can improve the strength of the bottom of the box 10, and combined with the provision of the insulating substrate 11, not only the insulation effect of the bottom of the box 10 is achieved, but also the weight of the bottom of the box 10 is reduced, which helps to achieve lightweighting of the box 10.

[0067] The frame 14 is usually relatively rigid and may be made of, but is not limited to, metal.

[0068] In some embodiments, the insulating bottom lining 11 is a plate-like structure formed by bonding glass fiber and carbon fiber.

[0069] The glass fiber has good insulation effect, and the carbon fiber has high strength. Specifically, the plate-like insulating bottom lining 11 can be prepared by mixing glass fiber, carbon fiber and an adhesive. At this time, the insulating bottom lining 11 takes into account both good insulation effect and strength.

[0070] In some embodiments, the box body 10 further includes a frame 12, and the frame 12 is disposed around the outer periphery of the insulating bottom lining 11. Understandably, the frame 12 and the insulating bottom lining 11 enclose a space with one end open, and the battery cell 200 is accommodated in this space. The box body 10 usually further includes an upper cover 13 covering the open end of this space. In order to improve the strength of the box body 10, the frame 12 can be made of a metal material, such as aluminum alloy.

[0071] Further in the embodiments, refer to Figure 3 , the insulating bottom lining 11 includes a support portion 11a and a clamping portion 11b. The support portion 11a has an inner bottom surface N, and the clamping portion 11b is disposed at the edge of the support portion 11a and is snap-fitted with the frame 12.

[0072] The insulating bottom lining 11 and the frame 12 are separately connected, specifically by snap-fitting the clamping portion 11b of the insulating bottom lining 11 with the frame 12. In this way, when the insulating bottom lining 11 and the frame 12 adopt different materials, it is easy to realize the assembly of the insulating bottom lining 11 and the frame 12.

[0073] Specifically, the frame 12 is provided with a bayonet, and the clamping portion 11b is snap-fitted in the bayonet. Or, the clamping portion 11b is provided with a bayonet, and the frame 12 is snap-fitted in the bayonet of the clamping portion 11b. Regarding the specific snap-fitting method between the frame 12 and the clamping portion 11b, those skilled in the art can make flexible designs.

[0074] Further in the embodiments, in combination with Figure 2 and Figure 3 Understand, the skeleton 14 is disposed on the support portion 11a. That is, when the box body 10 includes the skeleton 14, the skeleton 14 is disposed on the support portion 11a of the insulating bottom lining 11. Since the battery cell 200 is supported on the support portion 11a and the skeleton 14 is disposed below the support portion 11a, the battery cell 200 can be effectively supported.

[0075] Further in the embodiments, refer to Figure 2 and Figure 3 , weight-reducing holes q are formed in the clamping portion 11b and the frame 12. The setting of the weight-reducing holes q can reduce the weight of the frame 12 and the insulating bottom lining 11 and reduce the weight of the box body 10.

[0076] In some embodiments, refer to Figure 3 and Figure 4, the battery box 100 further includes a support bar 50 for supporting the battery cell 200, and the support bar 50 is disposed in the support area N1.

[0077] The support bar 50 is used to support the battery cell 200 and is separated between the battery cell 200 and the inner bottom surface N. Even if the condensed water overflows the water blocking strip 20 and flows to the support area N1, it is difficult for the condensed water to contact the battery cell 200 under the support of the support bar 50, further improving the insulation performance of the battery cell 200.

[0078] Preferably, the support bar 50 is made of an insulating material. Further, the support bar 50 is formed of a flexible material such as silica gel, rubber, etc.

[0079] In a specific embodiment of the present application, the box body 10 of the battery box 100 includes an upper cover 13, a frame 12, an insulating bottom lining 11 and a skeleton 14. The frame 12 surrounds the periphery of the insulating bottom lining 11 and is snap-connected to the insulating bottom lining 11. The upper cover 13 is covered at one end of the frame 12 facing away from the insulating bottom lining 11, and the skeleton 14 is disposed at one end of the insulating bottom lining 11 facing away from the frame 12. A water blocking strip 20 and a water collecting groove 30 are provided on the insulating bottom lining 11, and a reinforcing strip 40 is embedded in the outer groove portion 20a of the water blocking strip 20.

[0080] In addition, referring to Figure 5 , the embodiment of the present application further provides a battery pack, including a battery cell 200 and the battery box 100 in the above embodiment. The battery cell 200 is located in the battery box 100 and is supported in the support area N1. This battery pack has all the beneficial effects in the above embodiment.

[0081] In some embodiments, referring to Figure 8 , each battery cell 200 is coated with an insulating film 201. The insulating film 201 includes a flanging 201a extending along the periphery of the bottom surface of the battery cell 200. The flanging 201a covers a part of the bottom surface and encloses a window k exposing the remaining part of the bottom surface.

[0082] The insulating film 201 can be but is not limited to PET (polyethylene terephthalate). Coating the insulating film 201 on the battery cell 200 can improve the insulation ability of the battery cell 200. Taking the square battery cell 200 as an example, the insulating film 201 can be coated on the side, top and bottom surfaces of the battery cell 200. In this embodiment, the insulating film 201 only covers the edge area of the bottom surface of the battery cell 200 through its flanging 201a to form a window k on the bottom surface of the battery cell 200, and the window k can expose a partial bottom surface.

[0083] At this time, the insulating film 201 only covers a part of the bottom surface of the battery cell 200 through the flanging 201a, which can reduce the consumption of the insulating film 201, reduce the cost and simplify the process.

[0084] In some embodiments, referring toFigure 8 The width of the flanging 201a is h, satisfying: h≥2 mm; where h refers to the dimension of the flanging 201a in the direction perpendicular to its extending direction. When the width h of the flanging 201a is not less than 2 mm, the creepage distance between adjacent battery cells 200 can be ensured, improving the safety of the battery cells 200.

[0085] In some embodiments, referring to Figure 6 and Figure 7 , the battery pack further includes an adhesive layer 400, and the adhesive layer 400 is bonded between the bottom surface of the battery cell 200 and the support area N1. The adhesive layer 400 can be formed by a solid colloid, and it is bonded between the bottom surface of the battery cell 200 and the inner bottom surface N of the support area N1, which can improve the high reliability of the installation of the battery cell 200, and at the same time enhance the strength of the insulating lining by using the battery cell 200.

[0086] Specifically in the embodiment, referring to Figure 6 and Figure 7 , the support area N1 is provided with a support bar 50 for supporting the bottom surface of the battery cell 200, and the support bar 50 includes an edge support bar 51 close to the water blocking bar 20. The adhesive layer 400 includes an edge adhesive layer 401, and the edge adhesive layer 401 is blocked between the edge support bar 51 and the water blocking bar 20.

[0087] The edge support bar 51 is the support bar 50 adjacent to the water blocking bar 20. Regarding all the battery cells 200 as a whole, the edge adhesive layer 401 is arranged at the edge of this whole and is located between the edge support bar 51 and the water blocking bar 20. At this time, the edge adhesive layer 401 can not only bond the battery cell 200 to the inner bottom surface N, but also cooperate with the edge support bar 51 to further prevent the condensed water from flowing towards the area where the battery cell 200 is located.

[0088] Specifically, the edge support bar 51, the edge adhesive layer 401, and the water blocking bar 20 all extend along the second direction Y. In addition, the edge adhesive layer 401 and the edge support bar 51 can be bonded to each other.

[0089] In some embodiments, referring to Figure 7 , the battery pack includes multiple groups of battery cell groups 200A, and the multiple groups of battery cell groups 200A are arranged in sequence along the first direction X. Each battery cell group 200A includes multiple battery cells 200 arranged in sequence along the second direction Y intersecting with the first direction X. At this time, all the battery cells 200 are arranged into multiple groups of battery cell groups 200A in the battery box 100, and the layout is reasonable.

[0090] Optionally, a liquid cooling plate can be arranged between the battery cells 200 between each group of battery cell groups 200A to cool and dissipate heat from the battery cells 200. A support bar 50 can be arranged below each group of battery cell groups 200A, and the support bar 50 extends along the second direction Y and supports a group of battery cell groups 200A.

[0091] In some embodiments, the battery pack further includes side plates 300, and side plates 300 are disposed on both sides of each battery cell group 200A in the first direction X.

[0092] Specifically, the side plates 300 can be fixed to the frame 12 or the insulating lining 11 of the battery box 100. Side plates 300 are disposed between adjacent battery cell groups 200A and are in contact with the battery cell groups 200A. Of course, the side plates 300 can also be fixedly connected to the battery cell groups 200A. Specifically, the side plates 300 can be made of heat-conducting plastics such as epoxy resin, metal materials, etc.

[0093] At this time, the arrangement of the side plates 300 helps to strengthen the overall strength of the battery box 100.

[0094] In a further embodiment, the side plates 300 are thermally connected to the battery cell groups 200A for heat exchange with the battery cell groups 200A. The side plates 300 can be used as liquid cooling plates, and flow channels for circulating coolant can be provided therein. At this time, the side plates 300 are thermally connected to the battery cell groups 200A, which can enhance the heat dissipation of the battery cell groups 200A and equalize the temperatures of the individual battery cells 200 in the battery cell groups 200A.

[0095] In other embodiments, the side plates 300 can also be made of heat-insulating and flame-retardant materials to prevent the spread of thermal runaway between adjacent battery cell groups 200A.

[0096] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0097] The above embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A battery box (100), characterized in that: The battery box (100) comprises: The box body (10) has an inner bottom surface (N); a water blocking strip (20) protruding from the inner bottom surface (N) and dividing the inner bottom surface (N) into a supporting area (N1) and a non-supporting area (N2), wherein the supporting area (N1) is used to support the battery cell (200) contained in the battery box (100); A water collection groove (30) is recessed in the inner bottom surface (N) and is located in the non-support area (N2); the water collection groove (30) is connected to the inside and outside of the battery box (100).

2. The battery box (100) according to claim 1, characterized in that: The water blocking strip (20) comprises a first water blocking strip (21) and a second water blocking strip (22), wherein the first water blocking strip (21) and the second water blocking strip (22) are arranged at intervals in a first direction (X), and the water accumulation grooves (30) are arranged on two opposite sides of the first water blocking strip (21) and the second water blocking strip (22); The support area (N1) is located between the first water-blocking strip (21) and the second water-blocking strip (22).

3. The battery box (100) according to claim 1, characterized in that: The box body (10) has an outer bottom surface (M) disposed opposite to the inner bottom surface (N), the water blocking strip (20) is recessed relative to the outer bottom surface (M) to form a groove portion (20a), and a reinforcing strip (40) is embedded in the groove portion (20a).

4. The battery box (100) according to any one of claims 1 to 3, characterized in that: The box body (10) comprises an insulating base (11), and one side surface of the insulating base (11) serves as the inner bottom surface (N); The box body (10) further comprises a frame (14), wherein the frame (14) is arranged on a side of the insulating base (11) away from the inner bottom surface (N); and / or the insulating base (11) is a plate-like structure formed by bonding glass fibers and carbon fibers.

5. The battery box (100) according to claim 4, characterized in that: The box body (10) further comprises a frame (12), wherein the frame (12) is arranged around the outer periphery of the insulating substrate (11); The insulating base (11) comprises a supporting portion (11a) and a clamping portion (11b), wherein the supporting portion (11a) has the inner bottom surface (N), and the clamping portion (11b) is arranged at the edge of the supporting portion (11a) and is clamped and connected with the frame (12); The frame (14) is arranged on the supporting portion (11a), and weight-reducing holes (q) are formed in the clamping portion (11b) and the frame (12).

6. The battery box (100) according to any one of claims 1 to 3, characterized in that: The battery box (100) further comprises a support bar (50) for supporting the battery cell (200), wherein the support bar (50) is arranged in the support area (N1).

7. A battery pack, characterized in that: include: Battery cell (200); And the battery box (100) according to any one of claims 1 to 6, wherein the battery cell (200) is located in the battery box (100) and supported in the supporting area (N1).

8. The battery pack according to claim 7, characterized in that: Each of the battery cells (200) is coated with an insulating film (201); The insulating film (201) comprises a flange (201a) extending along the periphery of the bottom surface of the battery cell (200), the flange (201a) covering a portion of the bottom surface and enclosing a window (k) exposing the remaining portion of the bottom surface; The width of the flange (201a) is h, satisfying: h≥2mm; wherein h refers to the dimension of the flange (201a) in a direction perpendicular to its extension direction.

9. The battery pack according to claim 7, characterized in that: The battery pack further comprises an adhesive layer (400), wherein the adhesive layer (400) is bonded between the bottom surface of the battery cell (200) and the support area (N1); The support area (N1) is provided with a support bar (50) for supporting the bottom surface of the battery cell (200), and the support bar (50) includes an edge support bar (51) arranged close to the water blocking bar (20); The adhesive layer (400) comprises an edge adhesive layer (401), and the edge adhesive layer (401) is blocked between the edge supporting strip (51) and the water blocking strip (20).

10. The battery pack according to claim 7, characterized in that: The battery pack comprises a plurality of battery cell groups (200A), the plurality of battery cell groups (200A) are arranged in sequence along a first direction (X), and each of the battery cell groups (200A) comprises a plurality of battery cells (200) arranged in sequence along a second direction (Y) intersecting the first direction (X); The battery pack further comprises side plates (300), and each of the battery cell groups (200A) is provided with the side plates (300) on both sides in the first direction (X); The side plate (300) is thermally connected to the battery cell group (200A) and is used for exchanging heat with the battery cell group (200A).

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