Battery and battery module

Abstract

The utility model provides a battery and a battery module, the battery module comprises a plurality of batteries and structural adhesive, each battery comprises a battery cell and an insulating layer, the insulating layer is arranged on the side surface of the battery cell, at least one opening part is formed on the insulating layer, and the thickness of the insulating layer in the opening part is smaller than that of other parts of the insulating layer; the structural adhesive is arranged on the surface of the battery cell and located in the opening part, and the battery is connected with components adjacent to the battery through the structural adhesive. The utility model aims to solve the technical problem of poor heat dissipation effect of the battery module in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a battery and battery module. BACKGROUND

[0002] Lithium battery has small volume, high energy density, long service life, green environmental protection and the like advantages, is widely used in automobile, electronic product and energy storage system etc. industry. In the related art, the protection layer is coated outside the battery cell, not only can improve the appearance of the battery, more importantly, when a plurality of batteries are connected in series / parallel to form a battery module, the insulating film can prevent short circuit between adjacent batteries. When the battery is coated with an insulating layer, a back-shaped film wrapping method is usually used, but this film wrapping method produces a large repeated coverage area on the bottom surface or side surface of the battery. In order to facilitate connection, the batteries are connected through a glue layer, resulting in poor heat dissipation effect of the battery module. SUMMARY

[0003] Embodiments of the utility model provide a kind of battery and battery module, to solve the technical problem of poor heat dissipation effect of battery module in the related art.

[0004] In a first aspect, embodiments of the utility model provide a kind of battery module, comprising:

[0005] A plurality of batteries, each battery includes battery cell and insulating layer, the insulating layer is arranged on the side surface of the battery cell, at least one opening portion is formed on the insulating layer, the thickness of the insulating layer in the opening portion is less than the thickness of other parts of the insulating layer;

[0006] Structural glue is arranged on the surface of the battery cell, the structural glue is located in the opening portion, and the battery and the components adjacent to the battery are connected by the structural glue.

[0007] In an embodiment, the insulating layer includes a first part and a second part, the second part is arranged around the opening portion, the first part is arranged around the second part, and the thickness of the second part is less than the thickness of the first part.

[0008] In an embodiment, the structural glue is not coincident with the insulating layer;Or,

[0009] The structural glue and part of the second part are overlapped;Or,

[0010] The structural glue and the second part are overlapped, and part of the structural glue and the first part are overlapped.

[0011] In an embodiment, the thickness of the second part gradually decreases in the direction of the first part pointing to the opening portion.

[0012] In an embodiment, the second part has a first end connected to the first part, and a second end adjacent to the opening part, wherein a vertical distance between the first end and the second end is L1, and 0mm < L1 ≤ 2mm.

[0013] In an embodiment, two opening parts are provided on the insulating layer, and the two opening parts are respectively arranged on two opposite sides of the battery cell and / or two adjacent sides of the battery cell.

[0014] In an embodiment, a surface area of the opening part is S1, and an area of the side on which the opening part is arranged is S2, wherein 0.4 ≤ S1 / S2 ≤ 0.8.

[0015] In an embodiment, a maximum thickness of the structural adhesive is greater than or equal to a maximum thickness of the insulating layer; and / or,

[0016] A dielectric strength of the structural adhesive is greater than or equal to a dielectric strength of the insulating layer.

[0017] In an embodiment, the insulating layer is formed on the surface of the battery cell by a spraying process.

[0018] In an embodiment, a thickness of the insulating layer in the opening part is greater than 0.

[0019] In an embodiment, the opening part is formed on the insulating layer by a laser processing method.

[0020] In an embodiment, a thickness of the insulating layer in the opening part is 0.

[0021] In an embodiment, the battery cell is provided with a pole, an explosion-proof valve and a mark code, and the insulating layer and the structural adhesive wrap an area of the surface of the battery cell except the pole, the explosion-proof valve and the mark code.

[0022] In a second aspect, an embodiment of the utility model provides a battery, comprising a battery cell and an insulating layer, the insulating layer is arranged on the surface of the battery cell, at least one opening part is formed on the insulating layer, and the opening part is used for accommodating structural adhesive.

[0023] The embodiment of the utility model has the beneficial effects that:

[0024] In the technical scheme of the utility model, the side surface of the battery cell is provided with an insulating layer, the insulating layer is used for protecting the battery cell and avoiding the contact between the two adjacent battery cells, and the short circuit between the adjacent battery cells can be prevented. The insulating layer is provided with an opening part, the structural glue is arranged in the opening part, the structural glue is used for connecting the two battery cells or connecting the battery cell and the adjacent component of the battery cell, the structural glue is arranged in the opening part, the middle layer of structure can be effectively avoided, the structure is single, the control parameter is reduced, the stability of the bonding is improved, the local area thickness of the battery module can be avoided, the heat concentration can be avoided, the heat dissipation efficiency is improved, and the capacity of the battery module is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0026] Figure 1 It is the structure schematic view of an embodiment of the battery provided by the utility model;

[0027] Figure 2 It is Figure 1 the side view of;

[0028] Figure 3 It is Figure 2 the local enlarged view of A in;

[0029] Figure 4 It is the schematic view of the insulating layer spraying process provided by the utility model.

[0030] EXPLANATION OF DRAWINGS

[0031] Reference Name Reference Name 100 Battery 105 Opening 101 Battery cell 106 Pole 102 Insulation layer 107 Explosion-proof valve 103 First part 108 Code 104 Second part a Spray head DETAILED DESCRIPTION

[0032] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are only some embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model. In addition, it should be understood that the specific embodiments described herein are only used for illustrating and explaining the utility model, and are not used for limiting the utility model. In the utility model, the orientation words such as "up" and "down" are generally used for the up and down of the device actual use or working state, and the specific is the drawing direction in the drawing; And "inner" and "outer" are used for the contour of the device.

[0033] Embodiment 1

[0034] In the related art, an insulating layer is wrapped outside the battery cell, which not only improves the appearance of the battery, but more importantly, prevents short circuit between adjacent batteries when multiple batteries are connected in series / parallel to form a battery module. When wrapping the battery with an insulating layer, a back-shaped wrapping method is usually used. However, this wrapping method produces a large repeated coverage area on the bottom surface or side surface of the battery. In order to facilitate connection, the batteries are connected through a glue layer, which results in poor heat dissipation of the battery module.

[0035] In view of this, the utility model provides a battery module, Figures 1 to 4 The structure of an embodiment of the battery module provided by the utility model is shown in the accompanying drawings. The battery module will be described in detail below in combination with the accompanying drawings.

[0036] Please refer to Figure 1 , Figure 2 and Figure 3 The battery module includes a plurality of batteries 100 and structural glue. Each battery 100 includes a battery cell 101 and an insulating layer 102. The insulating layer 102 is arranged on the surface of the battery cell 101. At least one opening part 105 is formed on the insulating layer 102. The thickness of the insulating layer 102 in the opening part 105 is less than the thickness of other parts of the insulating layer 102. The structural glue is arranged on the surface of the battery cell 101. The structural glue is located in the opening part 105. Any two adjacent batteries 100 are connected through the structural glue.

[0037] In the technical scheme of the utility model, the surface of the battery cell 101 is provided with the insulating layer 102. The insulating layer 102 is used to protect the battery cell 101 and prevent contact between two adjacent battery cells 101, which can prevent short circuit between adjacent batteries 100. The opening part 105 is arranged on the insulating layer 102. The structural glue is arranged in the opening part 105. The structural glue is used to connect two batteries 100. The structural glue is arranged in the opening part 105, which can effectively avoid an extra layer of structure, simplify the structure, reduce the control parameters, improve the stability of bonding, and prevent the structural glue and the insulating layer 102 from being arranged in an overlapping manner. One layer of structure is reduced, which can avoid excessive thickness of the local area of the battery module, avoid heat concentration, improve the heat dissipation efficiency, and improve the capacity of the battery module.

[0038] It should be noted that in this embodiment, the battery cell 101 includes a core package, a shell, and an electrode assembly. The electrode assembly is connected to the core package, and the electrode assembly and the core package are arranged in the shell. The insulating layer is wrapped on the outer surface of the shell.

[0039] In this embodiment, the side surface refers to the side surface (excluding the upper end surface and the lower end surface) of the battery cell 101.

[0040] It should be noted that the specific type of the component is not limited, and the component can be the battery 100, can be the side plate of the box, can be the cooling plate, or can be the uniform heating plate. For example, in some embodiments, the component adjacent to the battery 100 is the battery 100, and the two adjacent batteries 100 are connected by structural glue. In some other embodiments, the component adjacent to the battery 100 is the side plate of the box, and the battery 100 and the side plate of the box are connected by structural glue. In some other embodiments, the component adjacent to the battery 100 is the uniform heating plate, and the battery 100 and the uniform heating plate are connected by structural glue.

[0041] It should be noted that the specific model of the battery 100 provided in the present application is not limited, and can be a cylindrical battery, a square battery, or a long blade battery. The selection can be made according to the actual situation. In order to facilitate the description, the battery 100 is described as a square battery in the following embodiments, and the square battery has two small sides arranged opposite to each other along the length direction, two large sides arranged opposite to each other along the width direction, and two end faces arranged opposite to each other along the height direction. The specific position of the opening part 105 is not limited, and can be set according to the specific layout of the battery module. The opening part 105 can be located on the small side, can be located on the large side, or can be located on the end face.

[0042] In some embodiments, the insulating layer 102 includes a first part 103 and a second part 104, the second part 104 is arranged around the opening part 105, the first part 103 is arranged around the second part 104, and the thickness of the second part 104 is less than the thickness of the first part 103. It should be noted that the thickness of the second part 104 is less than the thickness of the first part 103, which facilitates the pasting of the structural glue.

[0043] It should be noted that in order to ensure the space utilization rate and the heat dissipation efficiency, the structural glue is not overlapped with the insulating layer 102. In the actual production process, due to the machining precision and other problems, the structural glue will overlap the second part 104. In some other embodiments, the structural glue will completely overlap the second part 104, and even overlap part of the first part 103,

[0044] Specifically, the insulating layer 102 is formed on the surface of the battery cell 101 by coating. During the coating process, the coating material is coated on the surface of the battery cell 101 layer by layer, thereby accumulating to form the insulating layer 102. The transition area (i.e., the second part 104) is arranged at the connection between the insulating layer 102 and the opening part 105. Since the coating material is in a liquid state and has fluidity during the coating process, the transition area is used to avoid the solidified coating material remaining in the opening part 105 and occupying the opening part 105, thereby preventing the structural adhesive from being installed. During the coating process, the coating material is solidified from a liquid state to a solid state. The coating material that is coated first is solidified first. As the coating material is solidified, the coating material remaining in the transition area becomes less and less. Therefore, the thickness of the insulating layer 102 in the transition area is smaller, and the thickness of the second part 104 is smaller than the thickness of the first part 103. In this embodiment, the thickness of the second part 104 gradually decreases in the direction from the first part 103 to the opening part 105. On the one hand, this facilitates the solidification and molding of the insulating layer 102. On the other hand, this avoids the coating material of the insulating layer 102 occupying the opening part 105.

[0045] Further, in this embodiment, the end of the second part 104 connected to the first part 103 is the first end, the end of the second part 104 adjacent to the opening part 105 is the second end, and the vertical distance between the first end and the second end is L1, where 0 mm < L1 ≤ 2 mm. When L1 is 0, the second part 104 does not exist. During the coating and molding process of the insulating layer 102, the coating material will flow to the opening part 105 and occupy the opening part 105 due to the characteristics of the coating material itself. Since the thickness of the second part 104 is arranged to decrease, the insulating property and voltage resistance of the second part 104 are poor. When L1 is greater than 2 mm, the size of the second part 104 is too large, which can reduce the voltage resistance and insulating property of the entire insulating layer 102 and cause a larger safety hazard. Specifically, in this embodiment, L1 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.32 mm, 0.36 mm, 0.4 mm, 0.44 mm, 0.45 mm, 0.5 mm, 0.52 mm, 0.8 mm, 0.9 mm, 1.1 mm, 1.2 mm, 1.32 mm, 1.46 mm, 1.55 mm, 1.6 mm, 1.78 mm, 1.9 mm, 2 mm, or other unlisted data.

[0046] It should be noted that the formation mode of the opening part 105 is not limited and can be selected according to actual conditions. In some embodiments, the battery cell 101 is placed on a mold, and a spray head a is used to scan the surface of the battery cell 101 to spray the coating material on the surface of the battery cell 101 to form the insulating layer. During the spraying process, the switching area and switching time of the spray head a are controlled to perform system calculation, and the line speed and required spraying area of the coating material are calculated. Figure 4As shown, the spray head a is located on the left side of the battery cell 101. The spray head a is moved from left to right. When the spray head a is spraying on the opening area, the spray head a on the opening part 105 is closed, and the other spray heads a spray ink normally. In this way, a part of the surface of the battery cell 101 is not sprayed (this area is the opening part 105). In this way, the insulation layer 102 is formed at one time, the material is saved, and the later processing is avoided, and the processing steps are saved.

[0047] In another embodiment, the battery cell 101 is placed on the mold, and the spray head a is scanned on the surface of the battery cell 101 to spray the coating on the surface of the battery cell 101 to form the insulation layer. After the spraying is completed, the opening part 105 is etched by laser. This method has high processing precision, and the position of the opening part 105 is stable.

[0048] In order to ensure the stability of the connection, two opening parts 105 are arranged on the insulation layer 102, and the two opening parts 105 are arranged on the opposite sides of the battery cell 101. Specifically, in this embodiment, two opening parts 105 are arranged on each battery cell 101, and the two opening parts 105 are arranged on the two small sides of the battery cell 100. When the battery cells 100 are arranged in the battery module, the small sides of the two adjacent battery cells 100 correspond to each other. Part of the structural adhesive is arranged in the opening part 105 of one of the battery cells 100, and the other part is arranged in the opening part 105 of the other battery cell 100. In this way, the two battery cells 100 can be tightly abutted, the thickness between the two battery cells 100 is reduced, the local thickness of the battery module is avoided, and the capacity of the battery module is improved. In some other embodiments, the two opening parts 105 are arranged on the adjacent two sides of the battery cell 101. Specifically, the two opening parts 105 are arranged on one large side and one small side of the battery cell 100.

[0049] Further, in some embodiments, the surface area of the opening part 105 is S1, and the area of one side of the battery cell 101 is S2, wherein 0.4≤S1 / S2≤0.8. It should be noted that when S1 / S2 is less than 0.4, the area of the opening part 105 is small, which leads to the reduction of the size of the structural adhesive, and the stability of the connection between the two battery cells 100 is reduced. When S1 / S2 is greater than 0.8, the area of the opening part 105 is increased, which leads to the reduction of the area of the insulation layer 102, and the insulation and pressure resistance are reduced.

[0050] Further, the shape of the opening part 105 is not limited, which can be circular, oval, square, rectangular or special-shaped, and can be selected according to actual conditions. In this embodiment, the shape of the opening part 105 is rectangular or square, which is convenient for the clamping of the structural adhesive.

[0051] In some embodiments, in order to ensure the tightness of the connection, the maximum thickness of the structural adhesive is greater than the maximum thickness of the insulating layer 102. Of course, one small side of the battery 100 located at the outermost side does not need to be connected with other batteries 100, at this time, in order to ensure the utilization rate of space, the thickness of the structural adhesive is equal to the thickness of the insulating layer 102.

[0052] In some embodiments, due to the presence of the opening part 105, the insulation of the position of the opening part 105 is reduced, in order to avoid shorting between two adjacent batteries 100 due to the opening part 105, in this embodiment, the structural adhesive is an insulating adhesive, further, the dielectric strength of the structural adhesive is greater than or equal to the dielectric strength of the insulating layer 102, avoiding the structural adhesive from being broken down.

[0053] It should be noted that the arrangement of the insulating layer 102 is not limited. In some embodiments, the insulating layer 102 is formed on the surface of the battery cell 101 by coating, in order to ensure the insulation of the battery cell 101, the insulating layer 102 will also be coated at the position of the opening part 105, the thickness of the insulating layer 102 in the opening part 105 is greater than 0, the thickness of the insulating layer 102 here is relatively thin, only in order to improve the insulation of the battery 100, the specific thickness is set according to the actual situation.

[0054] In some other embodiments, in order to ensure the uniformity of the insulating layer 102, a uniform insulating layer 102 is coated on the surface of the battery cell 101 by coating or spraying (i.e. the insulating layer 102 wraps the entire surface of the battery cell), then the opening part 105 is processed on the insulating layer 102 by laser processing. It should be noted that when laser processing is used, the flow characteristics of the coating do not need to be considered, i.e. the insulating layer 102 only has the first part 103 and does not include the second part 104. In this way, the stability of the formation of the insulating layer 102 is ensured, so that the thickness of the insulating layer 102 at each position is substantially the same, thereby ensuring the insulation properties. In this embodiment, the thickness of the insulating layer 102 in the opening part 105 is 0.

[0055] In some embodiments, the battery cell 101 is provided with a pole 106, an explosion-proof valve 107 and a mark 108, and the insulating layer 102 and the structural adhesive wrap the surface of the battery cell 101 except the areas of the pole 106, the explosion-proof valve 107 and the mark 108. When the insulating layer 102 is wrapped on the battery cell 101, two first avoiding holes, a second avoiding hole and a third avoiding hole are formed on the insulating layer 102, the two first avoiding holes are used for the pole 106 to pass through, the second avoiding hole is used for the explosion-proof valve 107 to pass through, and the third avoiding hole is used for exposing the mark 108. The insulating layer 102 avoids the pole 106, the explosion-proof valve 107 and the mark 108 respectively, so that the insulating layer 102 is attached to the end face of the battery 100.

[0056] In some embodiments, the specific material of the insulating layer 102 is not limited, and can be selected according to actual conditions, which can be PP (polypropylene), and can also be PE (and polycarbonate).

[0057] In addition, the utility model also proposes a kind of electric equipment, and electric equipment includes battery module.The specific structure of battery module refers to the above embodiment, since the utility model for electric equipment adopts all technical solutions of the above all embodiments, at least has all beneficial effects brought by the technical scheme of the above embodiment, here will not be repeated.

[0058] It can be understood that the electric equipment includes but is not limited to electric toys, power tools, electric cars, cars, ships, spacecraft and the like. Among them, the electric toys can include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys and electric plane toys and the like, and the spacecraft can include airplanes, rockets, space shuttles and spacecraft and the like. The car can be a fuel car, a gas car and a new energy car.

[0059] Embodiment 2

[0060] The utility model proposes a kind of battery 100, and battery 100 includes electric core 101 and insulating layer 102, insulating layer 102 is arranged on the surface of electric core 101, at least one opening portion 105 is formed on insulating layer 102, and opening portion 105 is used to accommodate structural glue.

[0061] In the technical scheme of the utility model, the surface of electric core 101 is provided with insulating layer 102, and insulating layer 102 is used to protect electric core 101, avoid adjacent two electric cores 101 contact, can prevent the short circuit problem between adjacent battery 100. Opening portion 105 is provided on insulating layer 102, structural glue is arranged in opening portion 105, structural glue is used to connect two battery 100, structural glue is arranged in opening portion 105, can effectively avoid one more layer structure in the middle, structure is single, control parameter reduces, the stability of bonding improves, structural glue and insulating layer 102 will not be overlapped, reduce a layer structure, can avoid that the thickness of local area of battery module is too thick, avoid heat concentration, improve heat dissipation efficiency, improve the capacity of battery module.

[0062] The specific structure of battery 100 can refer to embodiment 1, and will not be repeated here.

[0063] The utility model also proposes a kind of battery module, and battery module includes above-mentioned battery 100.The specific structure of battery 100 refers to the above embodiment, since the battery module adopts all technical solutions of the above all embodiments, at least has all beneficial effects brought by the technical scheme of the above embodiment, here will not be repeated.

[0064] In addition, the utility model further provides a kind of electric equipment, and electric equipment includes battery module.The specific structure of battery module refers to the above embodiment, since the utility model electric equipment adopts all technical solutions of the above all embodiments, at least has all beneficial effects brought by the technical scheme of the above embodiment, and here is not repeated.

[0065] It can be understood that the electric equipment includes but is not limited to electric toys, electric tools, electric cars, cars, ships, spacecraft and the like. Among them, the electric toys can include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys and electric plane toys and the like, and the spacecraft can include airplanes, rockets, space shuttles and spaceships and the like. The car can be a fuel car, a gas car and a new energy car.

[0066] The above embodiments of the utility model are described in detail, and the principle and implementation mode of the utility model are described by applying specific examples in this paper. The above embodiment is only used to help understand the method and core idea of the utility model; at the same time, for those skilled in the art, according to the idea of the utility model, the specific implementation mode and application range will be changed, and the above description should not be understood as a limitation of the utility model.

Claims

1. A battery module, characterized in that: include: A plurality of batteries, each comprising a battery cell and an insulating layer, wherein the insulating layer is disposed on a side of the battery cell, and wherein at least one opening is formed in the insulating layer, and a thickness of the insulating layer within the opening is less than a thickness of other portions of the insulating layer; Structural adhesive is provided on the surface of the battery core, the structural adhesive is located in the opening, and the battery and the components adjacent to the battery are connected by the structural adhesive.

2. The battery module according to claim 1, wherein: The insulating layer includes a first portion and a second portion, the second portion is disposed around the opening portion, the first portion is disposed around the second portion, and a thickness of the second portion is smaller than a thickness of the first portion.

3. The battery module according to claim 2, characterized in that: The structural adhesive and the insulating layer are arranged so as not to overlap; or, The structural adhesive is overlapped with a portion of the second portion; or, The structural adhesive is overlapped with the second portion, and the structural adhesive is overlapped with a portion of the first portion.

4. The battery module according to claim 2, wherein: The thickness of the second portion gradually decreases along a direction from the first portion to the opening portion.

5. The battery module according to claim 4, characterized in that: The end of the second part connected to the first part is the first end, the end of the second part adjacent to the opening is the second end, and the vertical distance between the first end and the second end is L1, where 0 mm <L1≤2mm。 6. The battery module according to any one of claims 1 to 5, characterized in that: The insulating layer is provided with two openings, and the two openings are respectively provided on two oppositely arranged side surfaces and / or two adjacently arranged side surfaces of the battery cell.

7. The battery module according to any one of claims 1 to 5, characterized in that: The surface area of ​​the opening is S1, and the area of ​​the side surface where the opening is located is S2, wherein 0.4≤S1 / S2≤0.

8.

8. The battery module according to any one of claims 1 to 5, characterized in that: The maximum thickness of the structural adhesive is greater than or equal to the maximum thickness of the insulating layer; and / or, The dielectric strength of the structural adhesive is greater than or equal to the dielectric strength of the insulating layer.

9. The battery module according to claim 1, wherein: The insulating layer is formed on the surface of the battery core by a spraying process.

10. The battery module according to claim 9, characterized in that: The thickness of the insulating layer in the opening is greater than 0.

11. The battery module according to claim 1, wherein: The opening is formed on the insulating layer by laser processing.

12. The battery module according to claim 11, characterized in that: The thickness of the insulating layer in the opening is 0.

13. The battery module according to any one of claims 1 to 5, characterized in that: The battery cell is provided with a pole, an explosion-proof valve and a code, and the insulating layer and the structural adhesive wrap the surface area of ​​the battery cell except the pole, the explosion-proof valve and the code.

14. A battery, characterized in that: It includes a battery core and an insulating layer, wherein the insulating layer is arranged on the surface of the battery core, and at least one opening is formed on the insulating layer. The thickness of the insulating layer in the opening is less than the thickness of other parts of the insulating layer, and the opening is used to accommodate structural glue.

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