Battery casing, battery, disassembly method and battery pack

Abstract

The present invention relates to a battery shell, a battery, a disassembly method and a battery pack, wherein the battery shell comprises a cover body and a shell, the cover body is detachably mounted on the shell, and a receiving cavity is formed inside; the shell comprises a shell body and a first connecting portion; the first connecting portion is arranged circumferentially along the opening of the shell body and extends toward the cover body; a third convex structure is arranged on the outer side of the first connecting portion; the cover body comprises a cover portion and a lower extending portion; the lower extending portion is arranged circumferentially along the circumference of the cover portion on the side of the cover portion facing the shell; the lower extending portion is provided with a through hole and a glue nail; the lower extending portion is sleeved on the outside of the first connecting portion, and the first connecting portion and the cover portion are abutted and sealed by a sealing ring; one end of the glue nail passes through the through hole to be bonded and abutted against the lower side of the third convex structure. The battery shell of the present invention is easy to disassemble and convenient to recycle.

Description

Technical Field

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

[0002] The battery shell usually includes a flat top cover and a shell formed by stamping the side walls and bottom wall. The upper edge of the shell and the edges of the top cover need to be sealed into a cavity-shaped shell through structural connection to prevent the leakage of the built-in battery cells and electrolyte (flammable when exposed to oxygen), and to ensure the reliability of the sealed structural connection at the joint under strong vibration conditions. Due to the thin shell, the sealing of the joint and the efficiency of the joint processing are issues of great concern in the industry; currently, the joint between the top cover and the shell is usually achieved by metal welding and full welding; the metal welding method is usually laser welding or ultrasonic friction welding. The high heat during hot welding electrical connection can easily cause micro-short circuit damage inside the battery cell, and it is not easy to be detected online during the preparation process, which becomes an important hidden danger of spontaneous combustion caused by frequent charging and discharging in the future; at the same time, the spatter of hot welding falls into the internal battery cell, which can easily cause serious quality risks. When recycling / cracking old batteries on a large scale, non-positioned mechanical cracking is usually used to open the sealed cavity shell, which is not only very easy to cause short circuit or damage to the internal battery cells, but also inevitably causes the mixing of the shell metal material with the coating, current collector, and insulation material on the internal battery cells. The extraction of effective substances in the battery cells can only be done by separation / refining methods such as pyrometallurgy and hydrometallurgy to recover element-level effective components. The recycling process consumes a lot of energy and has a great impact on the environment, which is not conducive to the low-carbon and efficient use of the earth's scarce resources.

[0003] How to achieve direct component-level / material-level reuse of metals and scarce materials in the recycling process of old batteries is one of the key issues that urgently needs to be solved for the advancement of the industry. Summary of the invention

[0004] The invention discloses a battery casing, a battery, a disassembly method and a battery pack, aiming to solve the technical problems existing in the prior art.

[0005] The present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a battery housing comprising:

[0007] The battery housing comprises a cover and a shell, wherein the cover is detachably mounted on the shell and a receiving cavity is formed inside the cover;

[0008] The shell comprises a shell body and a first connecting portion; the first connecting portion is arranged circumferentially along the shell body and extends toward the cover body; a third protruding structure is arranged on the outer side of the first connecting portion;

[0009] The cover body comprises a cover portion and a lower extension portion; the lower extension portion is arranged along the circumference direction of the cover portion on one side of the cover portion facing the shell; the lower extension portion is provided with through holes and glue nails;

[0010] The lower extension portion is sleeved on the outside of the first connecting portion, and the first connecting portion and the cover portion are sealed; one end of the glue nail passes through the through hole and adheres to and abuts against the side of the third protrusion structure away from the cover body, which is used to quickly stabilize the relative position between the first connecting portion and the lower extension portion, and limit the cover body from being pulled away from the shell.

[0011] In a second aspect, the present invention further provides a battery, comprising any of the above-mentioned battery housings, battery cells, and first poles and second poles with different polarities;

[0012] The battery cell is arranged in the accommodating cavity;

[0013] The first pole and the second pole are arranged on the battery housing; one end of the first pole and one end of the second pole are electrically connected to the battery cell respectively, and the other end of the first pole and the other end of the second pole are used for external electrical connection respectively.

[0014] In a third aspect, the present invention further provides a battery pack, comprising a plurality of the above-mentioned batteries, wherein the batteries are square batteries, and the largest sides of the batteries are attached to each other;

[0015] The other end of the first pole and the other end of the second pole of the battery are respectively protruded from the cover or the shell, and are insulated from the cover or the shell;

[0016] The inner surface of the cover is fully covered with an insulating layer.

[0017] In a fourth aspect, the present invention further provides a method for disassembling the above-mentioned battery, comprising the following steps:

[0018] Soak the battery in an adhesive swelling disassembly solvent;

[0019] After the third structural adhesive layer is swollen, removing the third structural adhesive layer;

[0020] The battery with the third structural adhesive layer removed is placed in the adhesive swelling type disassembly solvent again, and the second structural adhesive layer to be cured and the adhesive pins expand and push open the gap between the lower extension part and the first connecting part;

[0021] Pull the cover off the shell and disassembly is complete.

[0022] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0023] The present invention mainly provides a battery casing, which is based on a method of setting a detachable connection between a cover body and a shell body, so as to facilitate the disassembly of used batteries so as to recycle internal battery cells and other materials; the cover body and the shell body are connected by bonding and abutting with glue nails and a third protruding structure, which, on the first hand, reduces the difficulty of disassembling the battery casing and facilitates the recycling of internal battery cells and other materials; on the second hand, avoids damage to the inside of the battery cells by welding; on the third hand, the cover body and the shell body are detachably connected by bonding and abutting with glue nails and a third protruding structure, and the relative positions of the two are fixed by glue nails after the cover body and the shell body are installed, which can reduce the deformation of the cover body and the shell body during installation, making it easier to install and also easier to disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments, which constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions explain the present invention and do not constitute improper limitations on the present invention. In the drawings:

[0025] Figure 1 This is a schematic diagram of the three-dimensional structure of the battery housing of Example 1 of the present invention when it is square;

[0026] Figure 2 This is a schematic diagram of the front view structure of the battery housing of Example 1 of the present invention when it is square;

[0027] Figure 3 For the present invention Figure 2 AA section view;

[0028] Figure 4 For the present invention Figure 3 A local enlarged view of point A;

[0029] Figure 5 It is a structural schematic diagram when the through hole of the present invention is a countersunk hole;

[0030] Figure 6 For the present invention Figure 3 A partial enlarged view of point B;

[0031] Figure 7 For the present invention Figure 3 A partial enlarged view of point C;

[0032] Figure 8 It is a structural schematic diagram of a battery housing according to Embodiment 1 of the present invention provided with a first reinforcement structure and a second reinforcement structure;

[0033] Fig. 9 It is a schematic structural diagram of a battery housing of the present invention when it is square;

[0034] Fig.10 For the present invention Fig. 9 AA section view;

[0035] Fig.11 is a cross-sectional view of a housing of the present invention;

[0036] Fig.12 This is a schematic diagram of the three-dimensional structure of the battery housing of Example 1 of the present invention when it is cylindrical;

[0037] Fig.13 This is a schematic diagram of the front view structure of the battery housing of Example 1 of the present invention when it is cylindrical;

[0038] Fig.14 For the present invention Fig.13 AA section view;

[0039] Fig.15 This is a schematic diagram of the three-dimensional structure of the battery housing of Example 1 of the present invention when it is cylindrical;

[0040] Fig.16 It is a structural schematic diagram of a fourth protrusion structure provided on the lower extension portion of Example 1 of the present invention;

[0041] Fig.17 It is a schematic diagram of the main structure of a battery pack according to Embodiment 3 of the present invention;

[0042] Fig.18 It is a schematic diagram of the left side structure of the battery pack of Example 3 of the present invention.

[0043] Description of reference numerals:

[0044] 10. Battery; 1. Battery casing; 11. Cover; 111. Cover; 112. Lower extension; 1121. Through hole; 1122. Recess; 113. First protruding structure; 114. Second reinforcing structure; 115. Glue nail; 116. Fourth protruding structure; 12. Shell; 121. Shell body; 122. First connecting part; 123. Second protruding structure; 124. First reinforcing structure; 125. Accommodating groove; 127. Third protruding structure; 13. Sealing ring; 14. Insulating layer; 15. Second structural adhesive layer; 16. Third structural adhesive layer; 17. Annular groove; 18. Insulating and heat-insulating layer; 19. Phase change material layer; 20. Cold plate; 30. Heat-conducting sheet; 40. Conductor plate; 50. Insulating plate; 60. Second cold plate. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. In the description of the present invention, it should be noted that the term "or" is usually used in the sense of including "and / or", unless the content clearly indicates otherwise.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a magnetic connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance; a plurality of terms in quantity means that the number is greater than or equal to 2.

[0047] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In order to solve the problems existing in the prior art, the present application provides a battery casing, a battery, an assembly method, a disassembly method and a battery pack. Example 1

[0049] This embodiment provides a battery housing, and the battery housing 1 may be a square battery housing or a cylindrical battery housing, such as Figure 1-Figure 3 , Figure 12-14As shown, the battery housing 1 includes a cover body 11 and a shell 12. The cover body 11 is detachably mounted on the shell 12, and a receiving cavity is formed inside. Optionally, the cover body 11 and the shell 12 are made of metal or non-metal materials, which are specifically determined according to needs; the shell 12 includes a shell body 121 and a first connecting portion 122; the first connecting portion 122 is arranged along the circumference of the shell body 121 and extends toward the cover body 11; a third protruding structure 127 is arranged on the outer side of the first connecting portion 122; the cover body 11 includes a cover portion 111 and a lower extension portion 112; the lower extension portion 112 is arranged along the circumference of the cover portion 111 On the side of the cover 111 facing the shell 12; the lower extension 112 is provided with a through hole 1121 and a glue nail 115; the cover body 11 is installed on the shell 12, and the lower extension 112 is sleeved on the outside of the first connecting portion 122, such as, the lower extension 112 and the first connecting portion 122 are both cylindrical structures with top and bottom openings, and the two are coaxially sleeved; the first connecting portion 122 and the cover 111 are sealed and connected, such as by direct abutment sealing, sealing with sealant or abutment sealing with a sealing ring 13; one end of the glue nail 115 passes through the through hole 1121 and is bonded and abutted against the third protrusion structure 127 away from the cover body 1 1, specifically, the side of the third protruding structure 127 away from the end of the first connecting portion 122, is used to quickly stabilize the relative position between the first connecting portion 122 and the lower extension portion 112, and limit the cover body 11 from being withdrawn from the shell body 12; during installation, the cover body 11 is installed on the shell body 12 to seal the two, and structural glue is poured into the through hole 1121 to form a glue nail 115 after the structural glue is cured. Since the glue nail 115 is injection-molded, it can be adapted to third protruding structures 127 of various shapes and can adapt to certain manufacturing deviations. Compared with the method of abutting between protrusions, the glue nail Based on the adhesive effect, 115 makes the relative position fixation between the cover body 11 and the shell 12 more secure and less prone to failure of the abutment fixation due to relative movement of the cover body 11 and the shell 12; preferably, the material of the glue nail 115 includes a single-component light-curing glue that dries quickly after being triggered by ultraviolet light, or a two-component quick-drying glue, so that the relative position between the cover body 11 and the shell 12 can be quickly fixed, and the glue nail 115 is cast after the cover body 11 and the shell 12 are assembled; it can shorten the operation time of the cover installation station on the production line, and quickly solidify the relative position between the cover body 11 and the shell 12.

[0050] The battery casing 1 of the present invention is based on a method of setting a detachable connection between the cover body 11 and the shell body 12, which is convenient for disassembling used batteries to recycle the internal battery cells and other materials; the cover body 11 and the shell body 12 are connected by bonding and abutting the glue nails 115 and the third protruding structure 127, which, on the first hand, reduces the difficulty of disassembling the battery casing and facilitates the recycling of the internal battery cells and other materials; on the second hand, it avoids damage to the inside of the battery cells by welding; on the third hand, the cover body 11 and the shell body 12 are detachably connected by bonding and abutting the glue nails 115 and the third protruding structure 127. After the cover body 11 and the shell body 12 are installed, the relative positions of the two are fixed by the glue nails 115, which can reduce the deformation of the cover body 11 and the shell body 12 during installation, making it easier to install and also easier to disassemble.

[0051] In some preferred embodiments, Figure 1-Figure 3 , Figure 9-10 , Figure 12-Figure 15 As shown, the end of the lower extension 112 is flush with the bottom surface of the shell 12, that is, the cover 11 completely covers the shell 12; or, the end of the lower extension 112 is not lower than the upper end surface of the battery cell. Based on this structural setting, the uniformity of the lateral heat dissipation of the battery cell is improved, thereby improving the consistency of the upper and lower temperatures of the battery, especially when the square batteries are grouped, which is conducive to improving the uniformity of the upper and lower temperatures of the battery.

[0052] In some preferred embodiments, Figure 4 , Figure 6 and Figure 7 As shown, the battery further includes an insulating layer 14 , and the insulating layer 14 is used for insulation between the cover 11 and the shell 12 .

[0053] Preferably, the insulating layer 14 is fully arranged on the inner surface of the cover 11 to achieve insulation between the cover 11 and the shell 12; when the square batteries are grouped, they are usually arranged in an upright parallel overlapping manner. The battery shell is thin, the overlapping area is large, and insulating materials are arranged between adjacent metal battery shells. It is difficult for heat to diffuse outward, and it is very easy to form a hot spot that continues to heat up. The hot spot continuously acts on the center point of the internal battery cell, causing a large temperature difference between the center point of the internal battery cell and the upper and lower ends, affecting the life of the internal battery cell. Based on the inner wall of the cover 11 being fully covered with the insulating layer 14, the grouping The cover bodies 11 between the batteries can be directly fitted together to increase the heat dissipation area; preferably, the cover body 11 completely covers the shell body 12, that is, the end of the lower extension 112 is flush with the bottom surface of the shell body 12, and the insulating layer 14 is fully provided on the inner wall of the cover body 11. When forming a battery pack, there is no need to provide insulating material between the batteries for electrical isolation, and based on the fitting between adjacent batteries and the fitting of the battery shells 1, specifically the fitting between the lower extensions 112, then since the battery shell 1 is made of metal, the fitting between the metal battery shells 1 can increase the heat dissipation area and improve the heat dissipation efficiency; more preferably.

[0054] Preferably, the insulating layer 14 is a layer structure having insulating and heat-insulating functions, such as an aerogel layer.

[0055] In some preferred embodiments, Figure 4 , Figure 6 , Fig. 9 and Fig.10 As shown, the battery casing further includes an insulating and heat-insulating layer 18, which provides lateral heat insulation and insulation between batteries to prevent heat spread; when the end of the lower extension portion 112 is flush with the bottom surface of the shell 12, the insulating and heat-insulating layer 18 may be arranged on the inner surface of the lower extension portion 112 or the outer surface of the shell 12; when the end of the lower extension portion 112 is not lower than the upper end surface of the battery cell, the insulating and heat-insulating layer 18 may be arranged on the inner surface of the lower extension portion 112 and the portion of the shell 12 exposed from the lower extension portion 112, or on the outer surface of the shell 12, at which time, preferably, the surface of the insulating and heat-insulating layer 18 located on the surface of the shell 12 exposed from the lower extension portion 112 is flush with the surface of the lower extension portion 112; the above description is made using a square battery casing as an example, and preferably, the insulating and heat-insulating layer 18 is arranged on the lower extension portion 112 and the shell 12 of the larger side; the cylindrical battery casing is similar and will not be repeated; preferably, the insulating and heat-insulating layer 18 is an aerogel layer.

[0056] In some preferred embodiments, Figure 3 As shown, a phase change material layer 19 is provided between the lower extension portion 112 and the first connecting portion 122, which is used for uniform temperature and heat insulation of the upper and lower parts of the battery, improving the upper and lower temperature consistency of the internal battery cells, and improving the life of the internal battery cells. Preferably, the phase change material layer 19 fills the space between the lower extension portion 112 and the first connecting portion 122; optionally, the phase change material can be paraffin or other solid phase change materials.

[0057] In some preferred embodiments, Fig.11 As shown, the first connection part 122 is circumferentially provided with an annular groove 17 near the outer surface of the end, specifically the outer surface of the open end; the setting of the annular groove 17 improves the structural rigidity of the end of the first connection part 122 and reduces the risk of deformation of the end due to external force; when it is a square battery casing, preferably, the groove depth of the annular groove 17 in the long side part is greater than the groove depth in the short side part, so as to facilitate the installation of the battery cell.

[0058] In some preferred embodiments, Figure 3 and Figure 4As shown, the lower extension portion 112 and the first connecting portion 122 are arranged in parallel and spaced apart; the spacing distance is not less than the height of the third protruding structure 127 to maintain the flatness of the lower extension portion 112; that is, the third protruding structure 127 will not squeeze the lower extension portion 112, thereby avoiding squeezing and deforming the lower extension portion 112 during installation and making the installation process easier; such as the first protruding structure 113 is attached to the first connecting portion 122, and / or the second protruding structure 123 is attached to the lower extension portion 112; to maintain the parallelism of the lower extension portion 112 and the first connecting portion 122.

[0059] In some preferred embodiments, Figure 1 , Figure 2 , Fig. 9 , Fig.10 , Fig.12 , Fig.13 and Fig.14 As shown, there are multiple third protrusion structures 127 and corresponding glue nails 115; multiple third protrusion structures 127 and glue nails 115 are spaced apart along the circumference of the battery casing 1, and are used to evenly lock the entire lower extension 112, thereby improving the stability of the connection between the cover body 11 and the shell 12; optionally, two are set on each long side of the circumference of the shell 12, and one is set on each short side, or they can be selected and set as needed.

[0060] In some preferred embodiments, Figure 4 , Figure 5 As shown, the glue nail 115 is a countersunk screw structure; the through hole 1121 is a countersunk hole 1121 that can accommodate the countersunk screw cap; the top of the cap does not exceed the outer side surface of the lower extension 112, which is used to enhance the connection strength between the glue nail 115 and the lower extension 112 and maintain the consistency of the outer peripheral size of the battery casing 1.

[0061] In some preferred schemes, the first connecting portion 122 and the cover portion 111 are sealed by abutting the sealing ring 13. The abutting sealing method of the sealing ring 13 can, on the one hand, achieve a sealed connection between the first connecting portion 122 and the cover portion 111 to avoid leakage of electrolyte. On the other hand, based on the abutting sealing method, it can adapt to a certain shaking of the rubber nail 115 and maintain the sealing effect.

[0062] In some preferred embodiments, Figure 3 and Figure 6As shown, a first protruding structure 113 is further provided on the inner side surface of the lower extension portion 112; a second protruding structure 123 is provided at an upper position corresponding to the outer side surface of the first connecting portion 122; the upper side surface of the first protruding structure 113 and the lower side surface of the second protruding structure 123 cooperate and abut (the first protruding structure 113 and the second protruding structure 123 are staggered along the direction in which the cover body 11 is pulled away from the shell 12) to limit the cover body 11 from being pulled away from the shell 12; based on the abutment and cooperation between the first protruding structure 113 and the second protruding structure 123, during installation, the cover body 11 and the shell 12 are first preliminarily fixed by the abutment and cooperation between the first protruding structure 113 and the second protruding structure 123, and then the structural glue is poured into the through hole 1121 to achieve further fixation between the cover body 11 and the shell 12, so that the connection between the cover body 11 and the shell 12 is more firm.

[0063] Preferably, in order to further improve the stability of the abutment between the first protruding structure 113 and the second protruding structure 123, the abutting surfaces of the first protruding structure 113 and the second protruding structure 123 are connected by a second structural adhesive layer 15; based on the setting of the second structural adhesive layer 15, on the one hand, the first protruding structure 113 and the second protruding structure 123 are prevented from lateral movement resulting in abutment failure, and on the other hand, based on the setting of the second structural adhesive layer 15, the friction between the first protruding structure 113 and the second protruding structure 123 can be improved, and the stability of the abutment is improved, so that the two are not easy to loosen, that is, the cover body 11 is not easy to be pulled out of the shell 12. Further preferably, the second structural adhesive layer 15 is an adhesive layer that can be disassembled by an adhesive swelling type disassembly solvent, such as anaerobic adhesive.

[0064] Preferably, the surfaces where the first protrusion structure 113 and the second protrusion structure 123 abut against each other are inclined surfaces and have a large inclination angle, for example, an angle of approximately 90° with the inner wall of the lower extension portion 112, that is, an angle of approximately 90° with the installation direction or the axial direction, so that the first protrusion structure 113 and the second protrusion structure 123 abut against each other firmly; at the same time, the surfaces on the first protrusion structure 113 and the second protrusion structure 123 opposite to the surfaces abutting against each other are inclined surfaces, and the inclined surfaces form an angle of approximately 0° with the inner wall of the lower extension portion 112, and the inclination angle is as small as possible to reduce the difficulty of the first protrusion structure 113 and the second protrusion structure 123 abutting against each other.

[0065] Preferably, if Fig.13 and Fig.14As shown, the surface where the first protruding structure 113 and / or the second protruding structure 123 abut against each other is an inclined surface; the cover body 11 and the shell 12 move relative to each other, the first protruding structure 113 and the second protruding structure 123 abut against each other and move relative to each other, and the first connecting portion 122 approaches or moves away from the cover portion 111. When the first connecting portion 122 is selected to abut and seal against the cover portion 111, the first connecting portion 122 approaches and abuts against the sealing cover portion 111; preferably, at this time, the battery shell is a cylindrical battery shell, and the cover body 11 and the shell 12 are installed between After the cover 11 and the housing 12 rotate relative to each other, the first protruding structure 113 and the second protruding structure 123 are in contact with each other, and can move along the inclined surface of the first protruding structure 113 and / or the second protruding structure 123. At this time, the end of the first connecting portion 122 is close to or away from the cover 111, that is, the distances from the two sides of the inclined surface along the relative rotation direction of the cover body 11 and the housing 12 to their respective ends are inconsistent; based on this structure, during installation, the first protruding structure 113 and the second protruding structure 123 are offset and not in direct contact, which reduces the difficulty of installation and facilitates installation. Preferably, at this time, the first connecting portion 122 and the cover 111 are sealed by abutting the sealing ring 13, so when the first connecting portion 122 and the cover 111 move relative to each other, the sealing ring 13 is tightened or loosened.

[0066] Preferably, the lower extension portion 112 and the first connecting portion 122 are both thinner metal sheets, and the position where the first protruding structure 113 is set on the lower extension portion 112 and / or the position where the second protruding structure 123 is set on the first connecting portion 122 have a structure that is deformed by lateral external force and can recover after the external force is removed, thereby reducing the difficulty of installation; preferably, the thickness of the metal sheet where the first protruding structure 113 and the second protruding structure 123 are set is thinner than that of other parts, so that the structure here is easier to deform.

[0067] Preferably, the first protrusion structure 113 and the second protrusion structure 123 are both multiple in number; the multiple first protrusion structures 113 and the second protrusion structure 123 are spaced apart along the circumference of the battery casing 1; the stability of the connection between the cover body 11 and the shell 12 is improved based on the arrangement of the multiple first protrusion structures 113 and the second protrusion structure 123; optionally, two are arranged on each of the long sides and one on each of the short sides in the circumference of the battery casing 1, or the arrangement can be selected as needed.

[0068] In some preferred embodiments, Figure 8As shown, the end of the first connection part 122 has a first reinforcement structure 124. Based on the setting of the first reinforcement structure 124, the structural strength of the end of the first connection part 122 is improved to avoid deformation under high pressure, thereby affecting the abutment sealing between the cover body 11 and the shell 12. Preferably, the first reinforcement structure 124 is an annular structure with a ∩-shaped cross section formed by folding the end of the first connection part 122 inward or outward; the top of the first reinforcement structure 124 is set to be an arc, so as to avoid deformation of the cover 111 due to abutment, especially when the sealing ring 13 is pressed between the first reinforcement structure 124 and the cover 111, when the sealing ring 13 is squeezed, even if the pressure is increased, the sealing ring 13 will not be damaged in structure, thereby ensuring its sealing performance.

[0069] In some preferred embodiments, Figure 8 As shown, the cover 111 has a second reinforcement structure 114, and the structural strength of the cover 111 is improved based on the arrangement of the second reinforcement structure 114. Preferably, the second reinforcement structure 114 is an annular structure with a ∩-shaped cross section; the cover 111 and the lower extension 112 are connected by the second reinforcement structure 114; that is, the second reinforcement structure 114 reinforces the structure of the turning part of the cover body 11. Preferably, when the first connection part 122 and the cover 111 are sealed and connected by abutting the sealing ring 13, the sealing ring 13 is arranged in the second reinforcement structure 114, which improves the stability of the position of the sealing ring 13 and ensures the sealing effect; at the same time, the first reinforcement structure 124 with a ∩-shaped cross section formed by the end of the first connection part 122 being folded inwardly or outwardly can improve the sealing pressure, and the area where the sealing ring 13 abuts against the second reinforcement structure 114 and the first reinforcement structure 124 is larger, which can also increase the sealing performance on the other hand.

[0070] In some preferred embodiments, Figure 7 As shown, the end of the first connecting portion 122 is bent inward to form an annular receiving groove 125; the receiving groove 125 receives the sealing ring 13; the sealing ring 13 abuts against the receiving groove 125 and the cover 111. Preferably, the cross section of the receiving groove 125 is "U"-shaped.

[0071] In some preferred embodiments, Figure 3 and Figure 4 As shown, the end of the lower extension portion 112 is sealed and connected to the first connection portion 122 via a third structural adhesive layer 16. The third structural adhesive layer 16 is an adhesive layer that can be disassembled by an adhesive swelling type disassembly solvent, such as UV adhesive or quick-drying polyurea; the third structural adhesive layer 16 is provided to prevent external dust from entering between the lower extension portion 112 and the first connection portion 122.

[0072] In some preferred embodiments, Fig.16As shown, the lower extension portion 112 is concavely formed with a fourth protruding structure 116; at least one side of the end of the fourth protruding structure 116 can abut against the third protruding structure 127 to limit the cover body 11 from being withdrawn from the shell body 12; a through hole 1121 is provided on the bottom surface of the concave portion of the fourth protruding structure 116; the rear end portion of the glue nail 115 is located in the through hole 1121, and the forward front end portion of the glue nail 115 passes through the through hole 1121 located on the bottom surface, and extends in the opposite direction to the end of the fourth protruding structure 116 through the corresponding surface of the connecting portion 122 to abut against the third protruding structure 127. The through hole 1121 is set at the joint, and / or, the side where the fourth protrusion structure 116 abuts the third protrusion structure 127, at this time, the lateral front end part of the glue nail 115 passes through the side through hole 1121 on the abutting surface and extends to the joint between the end of the fourth protrusion structure 116 and the third protrusion structure 127; that is, the through hole 1121 can be set separately on the concave bottom surface of the fourth protrusion structure 116 and the abutting side, or one of them can be selected; after the positive and / or lateral front end part of the glue nail 115 is cured, it is used to enhance the stability of the abutment and reinforce the restriction on the cover body 11 from being pulled out of the shell 12. Based on the end of the fourth protrusion structure 116 abutting against the third protrusion structure 127 with the glue nail 115, the end of the fourth protrusion structure 116 and the third protrusion structure 127 realize the preliminary abutting installation of the cover body 11 and the shell 12, and because the abutting part is small, the abutting part is a connection with limited strength, which is convenient for installation and disassembly; during installation, the glue nail 115 is used to further tighten the cover body 11 and the shell 12 into a high-strength connection, thereby increasing the stability of the shell connection; during disassembly, the glue nail 115 loses its viscosity after being soaked in solvent, and the connection between the end of the fourth protrusion structure 116 and the third protrusion structure 127 returns to a limited strength again, making the shell easy to disassemble. Example 2

[0073] The present embodiment provides a battery 10, which includes the battery casing, battery cells, first poles and second poles with different polarities in the above-mentioned embodiment 1; the battery cells are arranged in a accommodating cavity; one end of the first pole and one end of the second pole are electrically connected to the battery cells respectively, and the other end of the first pole and the other end of the second pole are respectively used for external electrical connection; a safety valve is arranged on the cover 111; the structure of the battery cells, the first pole, the second pole and the safety valve is no different from that of existing batteries, and the specific installation method can refer to the existing technology.

[0074] In some preferred schemes, the other end of the first pole and the other end of the second pole can be electrically connected to the outside in the following manner: when the battery is a square battery, the other end of the first pole and the other end of the second pole protrude from the cover 11 or the shell 12 as a connection end for external electrical connection, and are insulated from the cover 11 or the shell 12, and the cover 11 and the shell 12 can be set to be either insulated or electrically connected; when the battery is a cylindrical battery, the end of one of the first pole and the second pole extends out of the cover 11 or the shell 12, and is insulated, and the end of the other pole is electrically connected to the shell 12 or the cover 11, and the cover 11 and the shell 12 are electrically connected; or, when the battery is a cylindrical battery, the other end of the first pole is electrically connected to the cover 11, and the other end of the second pole is electrically connected to the shell 12, and the cover 11 and the shell 12 are insulated; the electrical connection between the cover 11 and the shell 12 can be achieved by cold welding glue, or other achievable methods are also acceptable. Example 3

[0075] This embodiment provides a battery pack, which includes a plurality of batteries 10 in Embodiment 2.

[0076] In some preferred schemes, when square batteries are used in groups, they are usually arranged in an upright, parallel, overlapping manner, and the bottom surface is uniformly heated and cooled by a cold plate. Since the battery casing is made of metal and is the third pole of the battery, a hard epoxy plate is currently generally used to electrically isolate adjacent battery casings; the internal heat of adjacent batteries can easily pass through the side walls of the battery casing and converge to the center of the overlapping surface. Because the battery casing is thin, the overlapping area is large, and insulating materials are provided between adjacent metal casings, it is difficult for heat to diffuse outward, and it is easy to form a hot spot that continues to heat up here. This hot spot continuously acts on the center point of the internal battery cell, resulting in a large temperature difference between the center point of the internal battery cell and the upper and lower ends, affecting the life of the internal battery cell. How to eliminate the accumulated temperature at the center point of adjacent square batteries arranged in an overlapping manner is one of the difficulties in thermal management in the industry.

[0077] To solve the above problems, Fig.17 and Fig.18 As shown, the largest sides of the square batteries 10 in the battery pack are attached to each other, that is, the sides where the long sides are located; the other end of the first pole and the other end of the second pole of the battery 10 are respectively protruding from the cover 11 or the shell 12, and are insulated from the cover 11 or the shell 12; the inner surface of the cover 11 is covered with an insulating layer 14. The battery pack of the present invention is based on the provision of an insulating coating on the inner wall of the cover 11 of the battery 10. Therefore, the covers 11 can be directly attached to each other, thereby increasing the heat dissipation area of ​​the battery shell 1, which is conducive to heat dissipation.

[0078] In some preferred embodiments, the end of the lower extension 112 of the cover body 11 is flush with the bottom surface of the shell 12, thereby increasing the contact area between the cover body 11 and further improving the heat dissipation effect.

[0079] In some preferred embodiments, the battery pack further comprises a cold plate 20; the cold plate 20 is attached to the bottom surface of the battery housing 1; the cold plate 20 and the battery housing 1 are insulated; a recess 1122 is provided in the middle of the side surface where the long side of the battery housing 1 is located; a temperature sensing unit, such as a thermistor, is provided in the recess 1122; and the temperature of the battery hot spot is monitored. The recess 1122 can be formed by stamping the lower extension 112 by the first protruding structure 113 of the lower extension 112, and the recess 1122 is formed on the outer surface of the lower extension 112. Based on the formation of the recess 1122 on the side surface of the battery housing 1 and the provision of the temperature sensing unit in the recess 1122, the temperature of the center position of the side wall of the battery 10 is measured to control the cold output of the cold plate 20, thereby effectively improving the heat dissipation effect of the battery 10 and reducing the temperature difference between the upper and lower center points of the battery cells in the battery housing 1; preferably, the end of the lower extension 112 of the cover 11 is flush with the bottom surface of the shell 12.

[0080] In some preferred embodiments, a heat conducting sheet 30 and / or a conductor plate 40 are provided between the sides of the battery housing 1 that are in contact with each other. Specifically, when the cover 11 is completely sleeved on the outside of the shell 12, the sides of the lower extension 112 of the cover 11 are in contact with each other; when the end of the lower extension 112 is not lower than the upper end surface of the battery cell, the lower extension 112 of the cover 11 is flush with the insulating heat insulating layer 18 on the shell body 121 of the shell 12; the heat conducting sheet 30 and / or the conductor plate 40 are used to increase the planar heat conduction cross-sectional area or increase the planar heat dissipation function; and are used to quickly evacuate the accumulated heat at the center point to the surroundings of the contact surface; the planar heat conducting sheet 30 is a multi-layer carbon surface structure, which has extremely high planar heat conduction effect, and also has axial heat conduction / electrical conduction effect. The conductor plate 40 is used to increase the heat conduction cross-sectional area.

[0081] In some preferred embodiments, the heat conductive sheet 30 and the conductor plate 40 are bonded together to obtain better electrical and thermal conductivity.

[0082] In some preferred embodiments, the lower extension 112 contacts the cold plate 20; at this time, the corresponding embodiment 1 in which the cover 11 is completely covered with the shell 12 further increases the heat dissipation area between the battery housing 1 and the cold plate 20 based on the contact between the lower extension 112 and the cold plate 20, thereby improving the heat dissipation effect.

[0083] In some preferred embodiments, a heat conductive sheet 30 is provided between the sides of the battery casing 1 that are bonded. Specifically, when the cover 11 is completely sleeved on the outside of the shell 12, the sides of the lower extension 112 of the cover 11 are bonded together; when the ends of the cover 11 and the shell 12 are connected, the lower extension 112 of the cover 11 and the insulating and heat-insulating layer 18 of the shell body 121 of the shell 12 are bonded together; the heat conductive sheet 30 extends downward and then bends and bonds to the bottom surface of the battery casing 1; the top surface of the bent portion of the heat conductive sheet 30 is insulated from the bottom surface of the battery casing 1, such as by providing an insulating film; the bottom surface of the bent portion of the heat conductive sheet 30 is bonded to the cold plate 20, which is used for uniform temperature and uniform temperature control between the side and bottom of the battery 10, and to strengthen the heat dissipation in the plane direction at the center of the side of the shell 12; the heat conductive sheet 30 in this embodiment can also be a composite heat conductive plate formed by bonding the heat conductive sheet 30 and the conductor plate 40.

[0084] In some preferred schemes, a heat conductive sheet 30 is arranged between the sides of the battery casing 1, and the heat conductive sheet 30 is extended upward and then bent to form a bent portion; the bent portion is insulated from the first pole and the second pole of the battery by an insulating plate 50, and the top surface of the bent portion is bonded to the second cold plate 60; by providing the second cold plate 60 and extending and bonding the heat conductive sheet 30 to the second cold plate 60, the side and bottom surfaces of the battery casing 1 can be temperature controlled separately. When the temperature of the bottom of the battery casing 1 is greatly different from the temperature of the center point of the side, the temperature of the second cold plate 60 can be adjusted separately to reduce the internal temperature difference of the battery cell; the heat conductive sheet 30 in this scheme can also be a composite heat conductive plate formed by bonding the heat conductive sheet 30 and the conductor plate 40.

[0085] In some preferred embodiments, the temperature sensor is connected to an external detection circuit system via a flexible bus.

[0086] In some preferred embodiments, cold welding glue is provided between the sides of the battery casings 1 that are bonded together, so as to enhance the thermal connection between adjacent battery casings 1 . Example 4

[0087] This embodiment provides a method for assembling the battery in the above embodiment 2, which comprises the following steps:

[0088] Fix the sealing ring 13 on the cover 111;

[0089] A second structural adhesive layer 15 is coated on the abutting surface of the first protruding structure 113 and / or the second protruding structure 123.

[0090] Install the battery cell, the first pole and the second pole;

[0091] The cover body 11 is installed on the housing 12. After the cover body 11 is installed in place, the sealing ring 13 is squeezed between the first connecting portion 122 and the cover portion 111, and the first protruding structure 113 and the second protruding structure 123 are abutted against each other to maintain pressure;

[0092] Pour quick-drying glue into the through hole 1121 and wait for it to solidify to form the glue nail 115;

[0093] Apply glue between the end of the lower extension portion 112 and the first connecting portion 122 and cure the glue;

[0094] Release the pressure and assemble.

[0095] In the assembly method of this embodiment, the pressure can be released after the glue nails 115 are formed by ultraviolet light irradiation, thereby shortening the time of the pressure holding operation in the battery manufacturing process and improving the assembly efficiency.

[0096] In some preferred embodiments, the step of stamping the cover 11 and the shell 12 is also included.

[0097] In some preferred embodiments, the step of completely covering the cover 11 with an insulating layer 14 is also included.

[0098] In some preferred embodiments, the method further includes filling a phase change material layer 19 between the end of the lower extension portion 112 and the first connection portion 122 .

[0099] In some preferred embodiments, the method further includes providing a heat insulating layer on the cover 11 and / or the shell 12 .

[0100] In some preferred embodiments, the glue material used to form the glue nail 115 is a UV-curable light-curing glue, and the glue nail 115 is formed by irradiating UV light. Example 5

[0101] This embodiment provides a method for disassembling the battery in the above embodiment 2, comprising the following steps:

[0102] The battery is immersed in an adhesive swelling type disassembly solvent; the adhesive swelling type disassembly solvent is; a composite N-methylpyrrolidone organic solvent, preferably, the material components and weight percentages of the composite N-methylpyrrolidone organic solvent are: N-methylpyrrolidone 65% to 70%, anhydrous ethanol 29.4% to 29.95%, and a silicone surfactant 0.04% to 0.6%.

[0103] After the third structural adhesive layer 16 is swollen, the third structural adhesive layer 16 is removed;

[0104] The battery with the third structural adhesive layer 16 removed is put into the adhesive swelling type disassembly solvent again, and the second structural adhesive layer 15 to be cured and the adhesive nails 115 expand and push open the gap between the lower extension part 112 and the first connecting part 122;

[0105] The cover 11 is pulled away from the housing 12, and the disassembly is completed.

[0106] The disassembly method of the present invention uses an adhesive swelling type disassembly solvent to swell and disassemble each adhesive location, which is more environmentally friendly.

[0107] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A battery housing, characterized in that: The battery housing comprises a cover and a shell, wherein the cover is detachably mounted on the shell and a receiving cavity is formed inside the cover; The shell comprises a shell body and a first connecting portion; the first connecting portion is arranged circumferentially along the shell body and extends toward the cover body; a third protruding structure is arranged on the outer side of the first connecting portion; The cover body comprises a cover portion and a lower extension portion; the lower extension portion is arranged along the circumference direction of the cover portion on one side of the cover portion facing the shell; the lower extension portion is provided with through holes and glue nails; The lower extension portion is sleeved on the outside of the first connecting portion, and the first connecting portion and the cover portion are sealed; one end of the glue nail passes through the through hole and adheres to and abuts against the side of the third protrusion structure away from the cover body, which is used to quickly stabilize the relative position between the first connecting portion and the lower extension portion, and limit the cover body from being pulled away from the shell.

2. The battery housing according to claim 1, characterized in that: The glue nails include single-component light-curing glue that dries quickly after being triggered by ultraviolet light, or two-component quick-drying glue.

3. The battery housing according to claim 1, characterized in that: The cover body is installed on the shell; the end of the lower extension portion is flush with the bottom surface of the shell.

4. The battery housing according to claim 1, characterized in that: The outer surface of the first connecting portion close to the end portion is provided with an annular groove along the circumferential direction; And / or, a phase change material layer is provided between the lower extension portion and the first connecting portion; And / or, the end of the first connection portion has a first reinforcement structure, and the first reinforcement structure is a ring structure with a ∩-shaped cross section formed by folding the end of the first connection portion inwardly or outwardly; And / or, the cover portion has a second reinforcement structure, the second reinforcement structure is an annular structure with a ∩-shaped cross section; the cover portion and the lower extension portion are connected via the second reinforcement structure; And / or, the third protrusion structure and the glue nail are both multiple in number; the multiple third protrusion structures and the glue nails are spaced apart and distributed along the circumference of the battery housing; And / or, the end of the lower extension portion is sealed and connected to the first connection portion via a third structural adhesive layer.

5. The battery housing according to claim 1, characterized in that: The first connection part and the cover part are sealed and connected via an abutting sealing ring, or the end of the first connection part is bent inward to form an annular receiving groove; the receiving groove receives the sealing ring; the sealing ring abuts against the receiving groove and the cover part.

6. The battery casing according to claim 1 or 3, characterized in that: It also includes an insulating layer or an insulating heat-insulating layer; the insulating layer is fully distributed on the inner surface of the cover body and is used for insulation between the cover body and the shell; the insulating heat-insulating layer is used for lateral heat insulation and insulation between batteries.

7. The battery housing according to claim 1, characterized in that: A first protruding structure is also provided on the inner side of the lower extension portion; a second protruding structure is provided on the outer side of the first connecting portion; the side of the first protruding structure and the side of the second protruding structure cooperate and abut to limit the cover from being withdrawn from the shell.

8. The battery casing according to claim 7, characterized in that: The abutting surfaces of the first protruding structure and the second protruding structure are connected via a second structural adhesive layer; And / or, the first protrusion structure and the second protrusion structure are both multiple in number; the multiple first protrusion structures and the second protrusion structures are distributed at intervals along the circumference of the battery housing.

9. The battery housing according to claim 1, characterized in that: The lower extension portion is concave to form a fourth protrusion structure; the end of the fourth protrusion structure can abut against the third protrusion structure to limit the cover body from being withdrawn from the shell; the through hole is provided at the concave bottom surface of the fourth protrusion structure and / or at the lateral abutment between the end of the fourth protrusion structure and the third protrusion structure.

10. A battery, characterized in that: The battery comprises a battery casing, a battery cell, and a first pole and a second pole with different polarities as described in any one of claims 1 to 9; The battery cell is arranged in the accommodating cavity; The first pole and the second pole are arranged on the battery housing; one end of the first pole and one end of the second pole are electrically connected to the battery cell respectively, and the other end of the first pole and the other end of the second pole are used for external electrical connection respectively.

11. A battery pack, characterized in that: Comprising a plurality of batteries as claimed in claim 10, wherein the batteries are square batteries, and the largest sides of the batteries are attached to each other; The other end of the first pole and the other end of the second pole of the battery are respectively protruded from the cover or the shell, and are insulated from the cover or the shell; The inner surface of the cover is fully covered with an insulating layer.

12. The battery pack according to claim 11, characterized in that: Also includes cold plates; The cold plate is attached to the bottom surface of the battery housing and is insulated from the battery housing; The sides where the long sides of the battery shell are located are fitted together, and a recess is provided in the middle of the sides where the long sides of the battery shell are located; a temperature sensing unit is provided in the recess, and a heat conductive sheet is provided between the sides where the battery shell is fitted together, and the heat conductive sheet is bent after extending downward and fitted to the bottom surface of the battery shell; the top surface of the bent portion of the heat conductive sheet is insulated from the bottom surface of the battery shell, and the bottom surface of the bent portion of the heat conductive sheet is fitted to the cold plate.

13. The battery pack according to claim 11 or 12, characterized in that: A heat conducting sheet is arranged between the sides of the battery housing, and the heat conducting sheet is extended upward and then bent to form a bending portion; the bending portion is insulated from the first pole and the second pole of the battery by an insulating plate, and the top surface of the bending portion is attached to the second cold plate.

14. A method for disassembling a battery as claimed in claim 10, characterized in that: The steps include: Soak the battery in an adhesive swelling disassembly solvent; After the third structural adhesive layer is swollen, removing the third structural adhesive layer; The battery with the third structural adhesive layer removed is placed in the adhesive swelling type disassembly solvent again, and the second structural adhesive layer to be cured and the adhesive pins expand and push open the gap between the lower extension part and the first connecting part; Pull the cover off the shell and disassembly is complete.

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