Battery box and battery pack

Abstract

The utility model relates to the technical field of batteries, and provides a battery box and a battery pack. The battery box comprises a box body and a box cover, the box body is provided with a side wall, a sealing groove is formed in the side wall, and the sealing groove extends in the surrounding direction of the side wall. The box cover covers the side wall to form a mounting cavity for mounting the battery cell, and the box cover is provided with a sealing rib which extends along the peripheral side of the box cover. Wherein the sealing groove is filled with a first adhesive layer, the sealing rib is clamped in the sealing groove and connected with the first adhesive layer, the sealing groove is provided with a first groove wall face close to the mounting cavity and a second groove wall face away from the mounting cavity, the height of the first groove wall face is h1, the height of the second groove wall face is h2, and h1 is smaller than h2. Therefore, the technical problem that the adhesive overflows to the outer surface of the battery box can be solved.

Description

Technical Field

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

[0002] In the related art, the battery box usually includes a box body and a box cover that covers the upper side of the box body. The box body and the box cover are usually sealed by the combination of a glue groove, a sealing rib and an adhesive. However, when the sealing rib is connected to the glue groove, if there is too much adhesive in the glue groove and the adhesive overflows and adheres to the outer surface of the battery box, the outer surface of the battery box needs to be cleaned in the subsequent process, which affects the production cycle and reduces the production efficiency. Utility Model Content

[0003] The embodiments of the utility model provide a battery box and a battery pack, which can improve the technical problem of adhesive overflowing to the outer surface of the box body when the box body and the box cover are sealed and connected.

[0004] In a first aspect, an embodiment of the present utility model provides a battery box, comprising:

[0005] The box body has a side wall, and a sealing groove is configured on the side wall, and the sealing groove extends along the circumferential direction of the side wall;

[0006] A box cover, which covers the side wall to form a mounting cavity for mounting the battery cell, wherein the box cover is provided with a sealing rib extending along the circumference of the box cover;

[0007] The sealing groove is filled with a first adhesive layer, the sealing rib is clamped in the sealing groove and connected to the first adhesive layer, the sealing groove has a first groove wall surface close to the mounting cavity and a second groove wall surface away from the mounting cavity, the height of the first groove wall surface is h1, and the height of the second groove wall surface is h2, satisfying: h1<h2.

[0008] In one embodiment, the height difference between the first groove wall surface and the second groove wall surface is Δh, Δh=h2-h1, satisfying: 0<Δh≤0.3 mm.

[0009] In one embodiment, the sealing groove has a width of D1 and a depth of H1, which satisfies: 3.5 mm ≤ D1 ≤ 4.5 mm, 4.5 mm ≤ H1 ≤ 5.5 mm.

[0010] In one embodiment, the sealing rib has a width of D2 and a height of H2, satisfying the following conditions: 1.4 mm ≤ D2 ≤ 1.6 mm, 3.9 mm ≤ H2 ≤ 4.1 mm.

[0011] In one embodiment, a process hole is configured on the box cover, and a first sealing member for sealing the process hole is welded on the box cover.

[0012] In one embodiment, the first sealing member is laser welded to the box cover, and the first sealing member is a light-transmitting sealing member, wherein the light transmittance of the first sealing member is T, and satisfies: 25%≤T≤35%.

[0013] In one embodiment, a mounting hole is configured on the side wall, and an explosion-proof valve is installed in the mounting hole, wherein a second sealing member is configured on an outer surface of the explosion-proof valve, or a second sealing member is configured on a hole wall surface of the mounting hole.

[0014] In one embodiment, a communication connector is constructed on the box cover, and the communication connector is configured to connect to a communication plug, wherein a third sealing member is embedded in the communication connector, or a third sealing member is disposed on the outer cover of the communication connector.

[0015] In one embodiment, a side of the box cover facing the box body is further configured with an annular groove, and the annular groove is located on a side of the sealing rib away from the installation cavity.

[0016] In a second aspect, an embodiment of the present utility model provides a battery pack, comprising:

[0017] As the aforementioned battery box;

[0018] A battery cell, installed in the installation cavity;

[0019] The length of the battery cell is L, and the height is H3, which satisfies: L>H3.

[0020] In one embodiment, a glue injection piece is constructed on the side of the side wall facing the battery cell, and the glue injection piece forms a glue injection groove, which extends along the height direction of the side wall. The side surface of the battery cell abuts against the glue injection piece and closes the notch of the glue injection groove, wherein a second adhesive layer is provided in the glue injection groove for bonding the battery cell and the glue injection piece.

[0021] Beneficial effects of the embodiments of the utility model:

[0022] In an embodiment of the utility model, by making the height of the first groove wall smaller than the height of the second groove wall, when excess adhesive is injected into the sealing groove, after the sealing rib is inserted into the sealing groove, excess adhesive will overflow from the side of the first groove wall with a lower height. The adhesive will not adhere to the outer surface of the box body, and there is no need to clean the outer surface of the battery box in subsequent processes, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a three-dimensional schematic diagram of a battery box provided by an embodiment of the utility model;

[0025] Figure 2 is an exploded view of a battery pack provided in an embodiment of the present utility model;

[0026] Figure 3 It is a three-dimensional schematic diagram of a box provided by an embodiment of the utility model.

[0027] Figure 4 It is one of the three-dimensional schematic diagrams of the box cover provided by the embodiment of the utility model.

[0028] Figure 5 This is the second stereoscopic schematic diagram of the box cover provided by the embodiment of the utility model.

[0029] Reference numerals:

[0030] 10-box body, 110-side wall, 120-sealing groove, 130-installation cavity, 140-first groove wall, 150-second groove wall, 160-installation hole, 170-glue injection groove, 180-second adhesive layer, 190-glue injection part, 20-box cover, 210-sealing rib, 220-process hole, 230-first sealing part, 240-annular groove, 250-support platform, 260-gripping part, 270-accommodating groove, 30-first adhesive layer, 40-explosion-proof valve, 410-dust cover, 50-communication connector, 510-stop part, 60-battery cell, 610-copper busbar, 70-circuit board. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0032] Specifically, Figures 1 to 5 As shown, an embodiment of the present application provides a battery box. The battery box includes a box body 10 and a box cover 20. The box body 10 has a side wall 110, and a sealing groove 120 is configured on the side wall 110. The sealing groove 120 extends along the circumferential direction of the side wall 110. The box cover 20 covers the side wall 110 to form an installation cavity 130 for installing the battery cell 60. The box cover 20 is configured with a sealing rib 210, and the sealing rib 210 extends along the circumferential side of the box cover 20. Among them, the sealing groove 120 is filled with a first adhesive layer 30, the sealing rib 210 is clamped in the sealing groove 120 and connected to the first adhesive layer 30, and the sealing groove 120 has a first groove wall surface 140 close to the installation cavity 130 and a second groove wall surface 150 away from the installation cavity 130. The height of the first groove wall surface 140 is h1, and the height of the second groove wall surface 150 is h2, satisfying: h1<h2.

[0033] It can be understood that by making the height of the first groove wall 140 smaller than the height of the second groove wall 150, when an excess amount of adhesive is injected into the sealing groove 120, the sealing rib 210 will be inserted into the sealing groove 120, causing excess adhesive to overflow from the side of the first groove wall 140 with a lower height. The adhesive will not adhere to the outer surface of the box body 10, and there is no need to clean the outer surface of the battery box in subsequent processes, thereby improving production efficiency.

[0034] In some embodiments, the battery box can be configured as a rectangular parallelepiped battery box. The bottom plate of the box body 10 is square, and the side walls 110 surround the bottom plate to form a box body 10 with a mounting groove. When the box cover 20 covers the side walls 110, the box cover 20 closes the mounting groove, thereby forming a mounting cavity 130.

[0035] In other embodiments of the present application, the battery box may also be a cylindrical battery box, an elliptical cylindrical battery box or a battery box of other shapes. The shapes of the box body 10, the side wall 110 and the box cover 20 may be reasonably set based on the shape of the battery box.

[0036] Among them, the side wall 110 has an inner surface close to the installation cavity 130, an outer surface away from the installation cavity 130, and a top surface connected between the inner surface and the outer surface. When the battery box is a rectangular parallelepiped battery box, the top surface of the side wall 110 is a rectangular annular surface. The aforementioned sealing groove 120 is arranged on the top surface, and the notch is arranged upward. Since the height of the first groove wall surface 140 of the sealing groove 120 is less than the height of the second groove wall surface 150, and the first groove wall surface 140 is close to the installation cavity 130, and the second groove wall surface 150 is away from the installation cavity 130, when the sealing rib 210 is clamped in the sealing groove 120, excess adhesive will overflow the sealing groove 120 from one side of the first groove wall surface 140, and flow from the top surface to the inner surface, and finally flow downward along the inner surface.

[0037] Since the adhesive will flow downward on the inner surface of the side wall 110, when the battery cell 60 is assembled in the mounting cavity 130, the side surface of the battery cell 60 can abut against the inner surface of the side wall 110. At this time, the adhesive overflowing into the interior can fill the gap between the battery cell 60 and the side wall 110, and the battery cell 60 is bonded to the side wall 110, so as to further improve the reliability of the fixation of the battery cell 60.

[0038] Since the sealing groove 120 is an annular groove, the sealing rib 210 arranged around the box cover 20 is also an annular rib. The annular sealing rib 210 is clamped in the annular sealing groove 120, and the sealing rib 210 and the sealing groove 120 are connected by the first adhesive layer 30 formed by the adhesive, so that the connection between the box body 10 and the box cover 20 can have a longer sealing path, so as to ensure good sealing between the box body 10 and the box cover 20.

[0039] The first adhesive layer 30 is a structure formed after the adhesive solidifies in the sealing groove 120 , and its shape is related to the shapes of the sealing groove 120 and the sealing rib 210 .

[0040] For example, if the sealing groove 120 is a rectangular annular groove, the first adhesive layer 30 is a rectangular annular structure. For example, if the sealing groove 120 is an annular groove with a tapered width, the first adhesive layer 30 is an annular structure with a tapered width.

[0041] The sealing rib 210 is an annular convex rib on the side of the box cover 20 close to the box body 10, and extends toward the box body 10. In addition, the sealing rib 210 can be integrally formed with the box cover 20.

[0042] It is understandable that the above method can achieve a sealed connection between the box body 10 and the box cover 20. On the basis of bonding in the above method, the box body 10 and the box cover 20 can be further fixed by fasteners such as bolts to ensure a reliable connection between the box body 10 and the box cover 20.

[0043] In some embodiments, the height difference between the first groove wall surface 140 and the second groove wall surface 150 is Δh, Δh=h2-h1, satisfying: 0<Δh≤0.3 mm.

[0044] It is understandable that the first groove wall 140 and the second groove wall 150 need to have a height difference to ensure that the adhesive overflows from one side of the first groove wall 140 as much as possible to prevent it from overflowing to the outside of the box 10 and affecting the aesthetics and requiring additional process steps to remove the adhesive attached to the surface of the box 10.

[0045] For example, Δh is 0.1 mm, 0.2 mm, 0.3 mm, or any value therebetween. Preferably, Δh is 0.2 mm. The second groove wall 150 is 0.2 mm higher than the first groove wall 140 , and the height gap can block excess adhesive to prevent the excess adhesive from overflowing from the second groove wall 150 .

[0046] It is understandable that if the value of △h is too large, the height of the second groove wall 150 will be too high or the height of the first groove wall 140 will be too low. When the height of the second groove wall 150 is too high, the height of the sealing rib 210 will also increase, resulting in an increase in the cost of the box body 10 and the box cover 20, and is not conducive to the rapid snap-fit ​​assembly of the box body 10 and the box cover 20. Since the groove depth of the sealing groove 120 depends on the height of the first groove wall 140, when the height of the first groove wall 140 is too low, the groove depth of the sealing groove 120 will also decrease, so that the amount of adhesive that can be contained in the sealing groove 120 becomes less, affecting the bonding effect and sealing effect of the box body 10 and the box cover 20.

[0047] In some embodiments, the sealing groove 120 has a width D1 and a depth H1, which satisfies: 3.5 mm≤D1≤4.5 mm, 4.5 mm≤H1≤5.5 mm.

[0048] The width D1 of the sealing groove 120 is the distance between the first groove wall 140 and the second groove wall 150. Since the height of the first groove wall 140 is less than the height of the second groove wall 150, the depth H1 of the sealing groove 120 corresponds to the height h1 of the first groove wall 140.

[0049] It is understandable that the sealing rib 210 needs to be inserted into the sealing groove 120, and the sealing rib 210 and the sealing groove 120 need to be bonded with adhesive. If the width D1 of the sealing groove 120 is less than 3.5 mm, the distance between the two sides of the sealing rib 210 and the first groove wall 140 and the second groove wall 150 will be smaller, so that less adhesive is bonded between the two sides of the sealing rib 210 and the first groove wall 140 and the second groove wall 150. As a result, the bonding performance is affected, resulting in the bonding effect and sealing effect of the box body 10 and the box cover 20 being affected.

[0050] When the width D1 of the sealing groove 120 is greater than 4.5 mm, the capacity of the sealing groove 120 will be larger. In this case, either the width of the sealing rib 210 is increased or more adhesive is injected into the sealing groove 120 to ensure reliable bonding between the sealing rib 210 and the sealing groove 120. Both methods will increase the cost.

[0051] Based on the above analysis, it can be known that the width of the sealing groove 120 is controlled within the range of 3.5 mm to 4.5 mm. Based on the reasonable selection of the width of the sealing groove 120, the production cost can be reduced as much as possible and the bonding and sealing effect can be ensured.

[0052] When the depth H1 of the sealing groove 120 is less than 4.5 mm, the depth of the adhesive in the sealing groove 120 will be shallow, and the amount of adhesive that can be accommodated is small, resulting in a poor bonding and sealing effect.

[0053] When the depth H1 of the sealing groove 120 is greater than 5.5 mm, the depth of the adhesive filled in the sealing groove 120 is deeper. When the sealing rib 210 is inserted into the sealing groove 120, it is easier for the adhesive to form bubbles, affecting the bonding effect of the adhesive. And when the depth of the sealing groove 120 is too large, more adhesive or a higher sealing rib 210 needs to be configured accordingly, resulting in increased costs.

[0054] Based on the above analysis, it can be known that the depth of the sealing groove 120 is controlled within the range of 4.5 mm to 5.5 mm. Based on the reasonable selection of the depth of the sealing groove 120, the production cost can be reduced as much as possible and the bonding and sealing effect can be ensured.

[0055] For example, the width of the sealing groove 120 is 3.5 mm, 3.7 mm, 4 mm, 4.3 mm, 4.5 mm, or any value therebetween. The depth of the sealing groove 120 is 4.5 mm, 4.7 mm, 5 mm, 5.3 mm, 5.5 mm, or any value therebetween.

[0056] In actual manufacturing, the depth of the sealing groove 120 is greater than the width of the sealing groove 120. For example, the width of the sealing groove 120 is 4 mm and the depth is 5 mm.

[0057] In some embodiments, the sealing rib 210 has a width D2 and a height H2, satisfying the following conditions: 1.4 mm ≤ D2 ≤ 1.6 mm, 3.9 mm ≤ H2 ≤ 4.1 mm.

[0058] Since the width D2 of the sealing rib 210 is set to 1.4 mm to 1.6 mm, the width D2 of the sealing rib 210 is bound to be smaller than the width D1 of the sealing groove 120. Based on the reasonable setting of the position of the sealing rib 210, when the sealing rib 210 is inserted into the sealing groove 120, a gap of a certain width will be left between the sealing rib 210 and the first groove wall 140 and between the sealing rib 210 and the second groove wall 150. The adhesive fills the gap and solidifies to form the first adhesive layer 30, so that the sealing rib 210 can be reliably bonded to the sealing groove 120 on both sides.

[0059] It is understandable that if the design width of the sealing rib 210 is greater than 1.6 mm, and combined with the production error of the sealing rib 210 during the manufacturing process, when the sealing rib 210 is inserted into the sealing groove 120, there may be no adhesive between the sealing rib 210 and the first groove wall 140, or there may be no adhesive between the sealing rib 210 and the second groove wall 150. As a result, the bonding effect between the sealing rib 210 and the sealing groove 120 will be affected, resulting in a poor sealing effect between the box body 10 and the box cover 20.

[0060] When the design width of the sealing rib 210 is less than 1.4 mm, the gaps between the two sides of the sealing rib 210 and the first groove wall 140 and the second groove wall 150 will be too large, requiring more adhesive to reliably bond the sealing rib 210 and the sealing groove 120, resulting in increased costs.

[0061] Based on the above analysis, it can be known that the width of the sealing rib 210 is controlled within the range of 1.4 mm to 1.6 mm. Based on the reasonable selection of the width of the sealing rib 210, the production cost can be reduced as much as possible and the bonding and sealing effect can be ensured.

[0062] It is understandable that if the height of the sealing rib 210 is greater than 4.1 mm, the distance between the sealing rib 210 and the bottom surface of the sealing groove 120 will be smaller, resulting in a smaller amount of adhesive between the sealing rib 210 and the bottom surface of the sealing groove 120, affecting the bonding effect between the sealing groove 120 and the sealing rib 210.

[0063] If the height of the sealing rib 210 is less than 3.9 mm, the distance between the sealing rib 210 and the bottom surface of the sealing groove 120 will be too large, and more adhesive will be needed to bond the sealing groove 120 and the sealing rib 210, increasing the cost.

[0064] Based on the above analysis, it can be known that the height of the sealing rib 210 is controlled within the range of 3.9 mm to 4.1 mm. Based on the reasonable selection of the height of the sealing rib 210, the production cost can be reduced as much as possible and the bonding and sealing effect can be ensured.

[0065] For example, the width of the sealing rib 210 is 1.4 mm, 1.45 mm, 1.5 mm, 1.55 mm, 1.6 mm, or any value therebetween. The height of the sealing rib 210 is 3.9 mm, 3.95 mm, 4 mm, 4.05 mm, 4.1 mm, or any value therebetween.

[0066] In some embodiments, the sealing groove 120 has a width of 4 mm and a depth of 5 mm. The sealing rib 210 has a width of 1.5 mm and a height of 4 mm. Thus, there is a suitable gap between the sealing rib 210 and the first groove wall surface 140, the second groove wall surface 150 and the groove bottom surface, thereby ensuring the bonding effect and controlling the production cost.

[0067] like Figure 2 and Figure 4 As shown, in some embodiments, a process hole 220 is configured on the box cover 20 , and a first sealing member 230 for sealing the process hole 220 is welded on the box cover 20 .

[0068] It is understandable that the battery box is installed with battery cells 60 and a circuit board 70 of a battery management system, and the circuit board 70 needs to be connected to the copper bus 610 of the battery cell 60 by bolts. The process hole 220 is used to insert fasteners. The fasteners are inserted into the installation cavity 130 from the process hole 220, and the circuit board 70 and the battery cell 60 are threadedly connected to achieve the fixation between the circuit board 70 and the battery cell 60. Among them, there are two fixed points between the circuit board 70 and the battery cell 60, and two process holes 220 are spaced apart on the box cover 20, and each process hole 220 is welded and sealed by a first seal 230.

[0069] Specifically, two transfer copper bars 610 are connected to the battery cell 60, and the two transfer copper bars 610 are respectively connected to B+ and B- of the battery module. Threaded holes are respectively constructed on the two transfer copper bars 610. Threaded holes are also constructed on the circuit board 70. The fasteners that are inserted from the process hole 220 into the installation cavity 130 are sequentially inserted into the two threaded holes to achieve electrical connection between the circuit board 70 and the battery cell 60. Thus, the battery cell 60 supplies power to the BMS.

[0070] Specifically, the first sealing member 230 is laser welded to the box cover 20. The first sealing member 230 is fixed to the box cover 20 by laser welding, which can make the sealing convenient, free of consumables and low in cost.

[0071] like Figure 4As shown, in order to place the first sealing member 230 in the process hole 220, a support platform 250 in the shape of a circular ring may be constructed on the inner surface of the process hole 220. The annular surface of the support platform 250 may be used to support the first sealing member 230, and the central hole of the support platform 250 may be used to penetrate a fastener to achieve the fixation of the battery cell 60 and the circuit board 70.

[0072] The aforementioned support platform 250 can be integrally formed on the inner surface of the process hole 220. The hole depth of the process hole 220 corresponds to the thickness of the box cover 20, the thickness of the support platform 250 will be less than the hole depth of the process hole 220, and the lower surface of the support platform 250 is flush with the lower surface of the process hole 220. Thus, a stepped placement area is formed between the upper surface of the support platform 250 and the upper surface of the process hole 220, so as to facilitate the placement of the first sealing member 230 on the support platform 250.

[0073] In order to ensure the aesthetics and flatness of the upper surface of the box cover 20 , the sum of the thickness of the first sealing member 230 and the supporting platform 250 is equal to the hole depth of the process hole 220 .

[0074] In some embodiments, the first sealing member 230 is a light-transmitting sealing member, wherein the light transmittance of the first sealing member 230 is T, and satisfies: 25%≤T≤35%.

[0075] Since the first sealing member 230 is sealed and connected to the process hole 220 by laser welding, the first sealing member 230 needs to be made of a light-transmitting material so that the laser can pass through the first sealing member 230. At the same time, the box cover 20 is a light-absorbing box cover, and the box cover 20 is made of a light-absorbing material. Thus, the laser can pass through the first sealing member 230 and melt the box cover 20 at the process hole 220 to connect with the first sealing member 230.

[0076] It is understandable that if the light transmittance of the first sealing member 230 is less than 25%, the laser consumes more energy to pass through the first sealing member 230, which may cause the light absorbing material below to fail to melt. It is necessary to increase the laser power to achieve laser welding, resulting in increased costs.

[0077] The light transmittance of the first seal 230 is positively correlated with its manufacturing difficulty. When its light transmittance is higher, its industrial production difficulty will be higher. When the light transmittance of the first seal 230 is greater than 35%, the manufacturing difficulty of the first seal 230 will be significantly increased, and its manufacturing cost will be significantly increased.

[0078] Thus, the light absorption rate of the first sealing member 230 is controlled within the range of 25% to 35%, and the laser power and the manufacturing difficulty of the first sealing member 230 can be reasonably controlled, thereby reducing the production cost.

[0079] Specifically, the first sealing member 230 is a nylon plastic with a light transmittance of 30%, and the box cover 20 is a light-absorbing nylon box cover. Of course, the first sealing member 230 and the box cover 20 can also be made of other materials, and the present embodiment of the application does not limit the materials of the two.

[0080] In other embodiments of the present application, the first sealing member 230 may also be fixed to the process hole 220 by bonding or other methods, so as to ensure that the first sealing member 230 can be sealed and connected to the process hole 220 .

[0081] like Figure 2 and Figure 3 As shown, in some embodiments, a mounting hole 160 is configured on the side wall 110, and an explosion-proof valve 40 is installed in the mounting hole 160, wherein the outer surface of the explosion-proof valve 40 is configured with a second sealing member, or the hole wall surface of the mounting hole 160 is configured with a second sealing member.

[0082] The explosion-proof valve 40 is arranged to comply with safety regulations. The second sealing member seals the connection between the explosion-proof valve 40 and the mounting hole 160 to ensure the sealing of the battery box.

[0083] In some embodiments, the explosion-proof valve 40 can be a cylindrical structure, and the circumference of the explosion-proof valve 40 has an integrally formed gasket. The mounting hole 160 is a circular hole. The second sealing member is a sealing ring. The sealing ring is sleeved on the outer surface of the explosion-proof valve 40, and the sealing ring abuts against the gasket. The explosion-proof valve 40 can be inserted into the mounting hole 160 from the mounting cavity 130, so that the gasket squeezes the sealing ring and the inner surface of the side wall 110, thereby achieving sealing.

[0084] In some embodiments, the explosion-proof valve 40 can be a cylindrical structure, and a clamping member is configured on the side of the explosion-proof valve 40 facing the side wall 110. The mounting hole 160 is a circular hole. The second sealing member is a sealing ring. The sealing ring is sleeved on the outer surface of the explosion-proof valve 40 near the clamping member. The explosion-proof valve 40 is inserted into the mounting hole 160 from the outside of the mounting cavity 130. At this time, the clamping member is clamped in the mounting hole 160, and the sealing ring is squeezed with the outer surface of the side wall 110 to achieve sealing.

[0085] In some embodiments, the explosion-proof valve 40 may be a cylindrical structure. The mounting hole 160 is a circular hole. The second sealing member is a sealing ring. The sealing ring is embedded in the hole wall of the mounting hole 160. The explosion-proof valve 40 may be inserted into the mounting hole 160 from the mounting cavity 130 so that the explosion-proof valve 40 squeezes the sealing ring to achieve sealing.

[0086] In which, since the explosion-proof valve 40 is located outside the battery box, in order to prevent the explosion-proof valve 40 from being contaminated by dust, a dust cover 410 is sleeved on the outside of the explosion-proof valve 40 .

[0087] like Figure 4As shown, in some embodiments, a communication connector 50 is constructed on the box cover 20, and the communication connector 50 is configured to connect to a communication plug, wherein the communication connector 50 is embedded with a third sealing member, or the communication connector 50 is covered with a third sealing member.

[0088] It is understandable that the communication connector 50 is connected to the communication plug to achieve electrical connection with the central control system or other electrical devices, so as to send the current parameters, voltage parameters, temperature parameters and other state parameters of the battery pack to the central control system to monitor the battery pack. The third sealing member is used to seal the connection between the communication plug and the communication connector 50 to achieve a sealed connection between the two, thereby ensuring the sealing of the battery box.

[0089] like Figure 4 As shown, the communication connector 50 is a square channel extending out of the box cover 20. A third sealing member can be embedded in the inner surface of the communication plug. When the communication plug is directly inserted into the square channel, the third sealing member can be located between the inner surface of the communication plug and the outer surface of the square channel, thereby achieving a sealing effect. Alternatively, a third sealing member can be sleeved on the outer surface of the communication plug, and the communication plug is inserted into the inside of the square channel. The third sealing member can be located between the outer surface of the communication plug and the inner surface of the square channel, thereby achieving a sealing effect.

[0090] The outer surface of the communication connector 50 may also be configured with a stopper 510, and the inner surface of the communication plug has a clamping portion that matches the stopper 510. When the communication plug is inserted into the communication connector 50, the clamping portion and the stopper 510 are mutually engaged to fix the position of the communication plug.

[0091] like Figure 5 As shown, in some embodiments, a side of the box cover 20 facing the box body 10 is further configured with an annular groove 240 , and the annular groove 240 is located on a side of the sealing rib 210 away from the installation cavity 130 .

[0092] It is understandable that the box cover 20 has a connection surface of a certain width on one side facing the box body 10, and the sealing rib 210 and the annular groove 240 are both arranged on the connection surface. When the box cover 20 is covered on the box body 10, the connection surface is connected to the top surface of the side wall 110. Among them, the annular groove 240 is located at a position where the connection surface is far away from the installation cavity 130, and the sealing rib 210 is located at a position where the connection surface is close to the installation cavity 130. When the box cover 20 is covered on the box body 10, the sealing rib 210 will be inserted into the sealing groove 120. If the adhesive in the sealing groove 120 is excessive, the excess adhesive will flow as much as possible toward the inside of the installation cavity 130 based on the height difference between the first groove wall surface 140 and the second groove wall surface 150. Even if there is adhesive flowing toward the outside of the installation cavity 130, this part of the adhesive can also flow into the annular groove 240 and be received by the annular groove 240. Thereby, the adhesive is further prevented from overflowing to the outer surface of the box body 10.

[0093] On the other hand, the embodiment of the present application further provides a battery pack. The battery pack includes a battery cell 60 and the battery box in the above embodiment. The battery cell 60 is installed in the installation cavity 130. The length of the battery cell 60 is L and the height is H3, which satisfies: L>H3.

[0094] It can be understood that by making the height of the first groove wall 140 smaller than the height of the second groove wall 150, when an excess amount of adhesive is injected into the sealing groove 120, the sealing rib 210 will be inserted into the sealing groove 120, causing excess adhesive to overflow from the side of the first groove wall 140 with a lower height. The adhesive will not adhere to the outer surface of the box body 10, and there is no need to clean the outer surface of the battery box in subsequent processes, thereby improving production efficiency.

[0095] Since the length L of the battery cell 60 is greater than the height H3 thereof, the battery cell 60 is installed in the battery box in a flat manner, thereby reducing the height of the battery pack.

[0096] The battery pack is particularly suitable for use in new energy vehicles as a starting battery for new energy vehicles. The position of the starting battery in the vehicle will result in insufficient space in the Z direction (height direction) of the battery pack. In the embodiment of the present application, by installing the battery cell 60 in a lying position in the battery box, the design height of the battery box can be reduced, ensuring that the Z direction space of the battery pack is small enough to meet the full loading requirements of the product.

[0097] In some embodiments, a glue injection part 190 is constructed on the side of the side wall 110 facing the battery cell 60, and the glue injection part 190 forms a glue injection groove 170, which extends along the height direction of the side wall 110, and the side surface of the battery cell 60 abuts against the glue injection part 190 and closes the notch of the glue injection groove 170, wherein a second adhesive layer 180 is provided in the glue injection groove 170 for bonding the battery cell 60 and the glue injection part 190.

[0098] Based on the construction of the glue injection part 190 on the inner side of the side wall 110, and the glue injection part 190 is formed with a glue injection groove 170 extending along the height direction of the side wall 110. After the battery cell 60 is arranged in the installation cavity 130, the side surface of the battery cell 60 abuts against the glue injection part 190. In this way, the side surface of the battery cell 60 can close the notch of the glue injection groove 170. Then, the adhesive is injected into the glue injection groove 170 from above the glue injection groove 170, and after the adhesive solidifies, the second adhesive layer 180 can be formed, thereby bonding the battery cell 60 and the glue injection part 190.

[0099] The side wall 110 includes four square plates, and a glue injection piece 190 can be provided on the inner surface of each square plate. The battery cell 60 is a square battery cell 60, and the four side surfaces of the battery cell 60 are respectively in contact with the four glue injection pieces 190, and the notches of the four glue injection grooves 170 are respectively closed. In this way, each side of the battery cell 60 can be bonded to the inner surface of the box body 10, ensuring the reliability of the fixation of the battery cell 60.

[0100] Alternatively, the glue injection parts 190 are constructed on the inner surfaces of two oppositely disposed square plates, so that the two opposite side surfaces of the battery cell 60 are respectively in contact with the glue injection parts 190 on both sides, and the notches of the glue injection grooves 170 on both sides are respectively closed. In this way, the opposite sides of the battery cell 60 can be bonded to the inner surfaces of the opposite sides of the box body 10, ensuring the reliability of the fixation of the battery cell 60.

[0101] The bottom of the battery cell 60 is also bonded to the bottom surface of the box body 10. Thus, the battery pack has more reliable anti-vibration and anti-impact performance.

[0102] like Figure 3 As shown, the glue injection member 190 may include two oppositely disposed vertical plates, and the two vertical plates are integrally formed on the inner surface of the side wall 110. Thus, the two oppositely disposed vertical plates cooperate with the side wall 110 to form the glue injection groove 170.

[0103] In some embodiments, in order to facilitate the taking of the battery pack, a gripping portion 260 is rotatably mounted on the box cover 20. A receiving groove 270 for receiving the gripping portion 260 is also formed on the box cover 20.

[0104] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery box, characterized in that: include: The box body has a side wall, and a sealing groove is configured on the side wall, and the sealing groove extends along the circumferential direction of the side wall; A box cover, which covers the side wall to form a mounting cavity for mounting the battery cell, wherein the box cover is provided with a sealing rib extending along the circumference of the box cover; The sealing groove is filled with a first adhesive layer, the sealing rib is clamped in the sealing groove and connected to the first adhesive layer, the sealing groove has a first groove wall surface close to the mounting cavity and a second groove wall surface away from the mounting cavity, the height of the first groove wall surface is h1, and the height of the second groove wall surface is h2, satisfying: h1<h2.

2. The battery box according to claim 1, characterized in that: The height difference between the first groove wall surface and the second groove wall surface is △h, △h=h2-h1, satisfying: 0<△h≤0.3 mm.

3. The battery box according to claim 2, characterized in that: The sealing groove has a width of D1 and a depth of H1, which satisfy the following conditions: 3.5 mm ≤ D1 ≤ 4.5 mm, 4.5 mm ≤ H1 ≤ 5.5 mm.

4. The battery box according to claim 3, characterized in that: The width of the sealing rib is D2, and the height is H2, which satisfies: 1.4 mm ≤ D2 ≤ 1.6 mm, 3.9 mm ≤ H2 ≤ 4.1 mm.

5. The battery box according to any one of claims 1 to 4, characterized in that: A process hole is configured on the box cover, and a first sealing member for sealing the process hole is welded on the box cover.

6. The battery box according to claim 5, characterized in that: The first sealing member is laser welded to the box cover, and the first sealing member is a light-transmitting sealing member, wherein the light transmittance of the first sealing member is T, and satisfies: 25%≤T≤35%.

7. The battery box according to any one of claims 1 to 4, characterized in that: A mounting hole is configured on the side wall, and an explosion-proof valve is installed in the mounting hole, wherein a second sealing member is configured on an outer surface of the explosion-proof valve, or a second sealing member is configured on a hole wall surface of the mounting hole.

8. The battery box according to any one of claims 1 to 4, characterized in that: A communication connector is constructed on the box cover, and the communication connector is configured to connect to a communication plug, wherein a third sealing member is embedded in the communication connector, or a third sealing member is disposed on the outer cover of the communication connector.

9. The battery box according to any one of claims 1 to 4, characterized in that: A side of the box cover facing the box body is further configured with an annular groove, and the annular groove is located on a side of the sealing rib away from the installation cavity.

10. A battery pack, characterized in that: include: The battery box according to any one of claims 1 to 9; A battery cell is installed in the installation cavity; The length of the battery cell is L, and the height is H3, which satisfies: L>H3.

11. The battery pack according to claim 10, characterized in that: A glue injection piece is constructed on the side of the side wall facing the battery cell, and the glue injection piece forms a glue injection groove, which extends along the height direction of the side wall. The side surface of the battery cell abuts against the glue injection piece and closes the notch of the glue injection groove, wherein a second adhesive layer is provided in the glue injection groove for bonding the battery cell and the glue injection piece.

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