Battery device, assembly method thereof and photovoltaic system

Abstract

The embodiment of the invention relates to the technical field of photovoltaic energy storage, and discloses a battery device, an assembly method thereof and a photovoltaic system. The battery device comprises a battery cell assembly, a first end cover, a second end cover, a ribbon assembly and a heating assembly. The battery cell assembly comprises a plurality of single batteries which are stacked in a first direction; the first end cover and the second end cover are respectively arranged at two end parts of the battery core assembly in the first direction; the cable tie assembly is arranged on the peripheries of the battery core assembly, the first end cover and the second end cover in a surrounding and sleeving manner; the heating assembly is attached to the surface of the battery cell assembly and / or the ribbon assembly, and the heating assembly is used for heating the battery cell assembly. The battery core assembly is fixed with the first end cover and the second end cover by arranging the ribbon assembly, so that the firmness and the stability of the battery device are improved; by arranging the heating assembly on the battery cell assembly, the problem that normal energy storage and power supply are difficult to start in the battery cell assembly in the battery device under the cold condition can be solved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of photovoltaic energy storage technology, and in particular to a battery device and an assembly method thereof, and a photovoltaic system. Background Art

[0002] Photovoltaic technology refers to a technology that converts light energy into electrical energy through photovoltaic equipment, which can make full use of light energy. In the photovoltaic field, photovoltaic inverters usually have energy storage modules to achieve a structure that integrates light, storage and charging. Photovoltaic equipment is usually installed outdoors with good lighting conditions. Therefore, photovoltaic equipment is greatly affected by the external environment. In cold conditions, the energy storage modules in photovoltaic equipment are prone to difficulty in starting normal energy storage and power supply. Summary of the invention

[0003] The main technical problem solved by the embodiments of the present application is to provide a battery device and an assembly method thereof, and a photovoltaic system, which can effectively solve the above-mentioned problems.

[0004] A technical solution adopted in an embodiment of the present application is: to provide a battery device, including a cell assembly, a first end cover, a second end cover, a tie assembly and a heating assembly. The cell assembly includes a plurality of battery cells stacked along a first direction; the first end cover and the second end cover are respectively arranged at the two ends of the cell assembly in the first direction; the tie assembly is wrapped around the periphery of the cell assembly, the first end cover and the second end cover; the heating assembly is fitted on the surface of the cell assembly and / or the tie assembly, and the heating assembly is used to heat the cell assembly. By arranging the tie assembly to fix the cell assembly to the first end cover and the second end cover, the firmness and stability of the battery device are improved; by arranging the heating assembly on the cell assembly, the problem that the cell assembly in the battery device is difficult to start normal energy storage and power supply under cold conditions can be solved.

[0005] In some embodiments, the cable tie assembly includes a first cable tie and a second cable tie, the first cable tie and the second cable tie are spaced apart along a second direction, and the second direction is perpendicular to the first direction; the first end cover is provided with a first limiting portion and a second limiting portion spaced apart in the second direction, and the second end cover is provided with a third limiting portion and a fourth limiting portion spaced apart in the second direction, the first cable tie is abutted against the first limiting portion and the third limiting portion at the same time, and the second cable tie is abutted against the second limiting portion and the fourth limiting portion at the same time.

[0006] In some embodiments, the first limiting portion includes a first protrusion and a first guide portion, the first protrusion and the first guide portion are spaced apart in the second direction to form a first limiting space, and the first guide portion is located on a side of the first protrusion away from the second limiting portion, and the first cable tie is disposed in the first limiting space; and / or, the second limiting portion includes a second protrusion and a second guide portion, the second protrusion and the second guide portion are spaced apart in the second direction to form a second limiting space, and the second guide portion is located on a side of the second protrusion away from the first limiting portion, and the second cable tie is disposed in the second limiting space.

[0007] In some embodiments, the first cable tie is an integrally formed continuous ring-shaped steel belt, and / or the second cable tie is an integrally formed continuous ring-shaped steel belt.

[0008] In some embodiments, the cable tie assembly includes a first protective member and a second protective member, wherein the first protective member is disposed between the first cable tie and the battery cell assembly, and the second protective member is disposed between the second cable tie and the battery cell assembly.

[0009] In some embodiments, the heating assembly includes a first heating film and a second heating film. Along the third direction, the first heating film and the second heating film are respectively arranged on both sides of the battery cell assembly, and are fitted and connected with at least two or more battery cells. The first direction, the second direction and the third direction are perpendicular to each other; along the second direction, the first heating film and the first tie and the second tie are spaced apart; and / or, the second heating film and the first tie and the second tie are spaced apart.

[0010] In some embodiments, the battery cell assembly also includes a box body and a plurality of thermal insulation components, a plurality of battery cells are arranged in the box body, and a thermal insulation component is arranged between two adjacent battery cells; the battery device also includes an electronic control component and a top cover, the electronic control component is arranged at the end of the battery cell assembly along the second direction, the electronic control component is electrically connected to the battery cells, and the top cover is arranged on the side of the electronic control component away from the battery cell assembly.

[0011] Another technical solution adopted in the embodiment of the present application is: providing a photovoltaic system including a battery device.

[0012] Another technical solution adopted in the embodiment of the present application is: to provide an assembly method of a battery device, the assembly method is used to assemble and manufacture the battery device, the assembly method comprising: stacking a first end cover, a plurality of battery cells and a second end cover along a first direction to form a first whole, wherein the plurality of battery cells are located between the first end cover and the second end cover; squeezing the first whole along the first direction with a preset pressure, and sleeve the cable tie assembly on the first whole along the second direction, wherein the first direction and the second direction are perpendicular; arranging a heating assembly on the side of the first whole in a third direction, and the heating assembly is fitted and connected with at least a plurality of battery cells, wherein the third direction is perpendicular to the first direction and the second direction respectively; arranging an electronic control assembly at the end of the first whole in the second direction, and the electronic control assembly connects the plurality of battery cells in series and / or in parallel.

[0013] In some embodiments, before stacking the first end cover, several battery cells and the second end cover in a first direction to form a first whole with several battery cells located between the first end cover and the second end cover, the assembly method further includes: pre-testing several battery cells.

[0014] In some embodiments, after the steps of disposing the electric control assembly at the end of the first unit in the second direction and connecting a plurality of battery cells in series and / or in parallel, the assembly method further includes: performing communication detection on the battery device.

[0015] The beneficial effects of the embodiments of the present application are as follows: the battery device of the embodiments of the present application includes a battery cell assembly, a first end cover, a second end cover, a tie assembly and a heating assembly. The battery cell assembly includes a plurality of battery cells stacked along a first direction; the first end cover and the second end cover are respectively arranged at the two ends of the battery cell assembly in the first direction; the tie assembly is wrapped around the periphery of the battery cell assembly, the first end cover and the second end cover; the heating assembly is fitted on the surface of the battery cell assembly and / or the tie assembly, and the heating assembly is used to heat the battery cell assembly. By setting the tie assembly to fix the battery cell assembly to the first end cover and the second end cover, the firmness and stability of the battery device are improved; by setting the heating assembly on the battery cell assembly, the problem that the battery cell assembly in the battery device is difficult to start normal energy storage and power supply under cold conditions can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application, the following is a brief introduction to the drawings required for describing the specific embodiments. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0017] Figure 1 is an exploded view of a battery device according to an embodiment of the present application.

[0018] Figure 2 It is a schematic diagram of a battery device according to an embodiment of the present application from one perspective.

[0019] Figure 3 yes Figure 2 Enlarged view of part A in the figure.

[0020] Figure 4 It is a schematic diagram of the battery device according to the embodiment of the present application from another perspective.

[0021] Figure 5 yes Figure 4 Enlarged view of part B in the middle.

[0022] Figure 6 It is a flow chart of an assembly method according to another embodiment of the present application.

[0023] The reference numerals in the specific implementation manner are as follows:

[0024] 100, battery device; 10, battery cell assembly; 11, battery cell; 12, box; 13, thermal insulation; 20, first end cover; 21, first limiter; 211, first convex; 212, first guide; 22, second limiter; 221, second convex; 222, second guide; 30, second end cover; 31, third limiter; 311, third convex; 312, third guide; 32, fourth limiter; 321, fourth convex; 322, fourth guide; 40, cable tie assembly; 41, first cable tie; 42, second cable tie; 43, first protective member; 44, second protective member; 50, heating assembly; 51, first heating film; 52, second heating film; 60, electronic control assembly; 70, top cover; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "vertical", "horizontal", etc. used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0027] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0028] See also Figure 1 and Figure 2 The embodiment of the present application provides a battery device 100, which includes a battery cell assembly 10, a first end cap 20, a second end cap 30, a tie assembly 40 and a heating assembly 50. The battery cell assembly 10 includes a plurality of battery cells 11 stacked along a first direction X, and the battery cell assembly 10 is used to store and release electric energy. The first end cap 20 and the second end cap 30 are respectively arranged at the two ends of the battery cell assembly 10 in the first direction X; the tie assembly 40 is arranged around the periphery of the battery cell assembly 10, the first end cap 20 and the second end cap 30 to fix the battery cell assembly 10, the first end cap 20 and the second end cap 30. The heating assembly 50 is arranged on the surface of the battery cell assembly 10 and / or the tie assembly 40, and the heating assembly 50 is electrically connected to an external power source. The heating assembly 50 is used to generate heat and transfer the heat to the battery cell assembly 10 to increase the temperature of the battery cell assembly 10, thereby solving the problem that the battery cell assembly 10 in the battery device 100 is difficult to start normal energy storage and power supply under cold conditions.

[0029] In some embodiments, see Figure 2 and Figure 4 The strap assembly 40 includes a first strap 41 and a second strap 42, which are arranged at intervals along the second direction Y, wherein the second direction Y is perpendicular to the first direction X. The first end cover 20 is provided with a first limit portion 21 and a second limit portion 22 arranged at intervals in the second direction Y, and the second end cover 30 is provided with a third limit portion 31 and a fourth limit portion 32 arranged at intervals in the second direction Y. The first strap 41 abuts against the first limit portion 21 and the third limit portion 31 at the same time, thereby fixing the first strap 41 relative to the battery cell assembly 10. The second strap 42 abuts against the second limit portion 22 and the fourth limit portion 32 at the same time, thereby fixing the second strap 42 relative to the battery cell assembly 10.

[0030] During the assembly of the battery device 100, a force is first applied along the first direction X to compress the first end cover 20, the battery cell assembly 10, and the second end cover 30, and then the first tie 41 is sleeved on the periphery of the first end cover 20, the battery cell assembly 10, and the second end cover 30 along the second direction Y. The first limiter 21 and the third limiter 31 limit the movement of the first tie 41 in the second direction Y. The second tie 42 is sleeved on the periphery of the first end cover 20, the battery cell assembly 10, and the second end cover 30 in the opposite direction of the second direction Y. The second limiter 22 and the fourth limiter 32 limit the movement of the second tie 42 in the opposite direction of the second direction Y. When the force in the first direction X is removed, the first end cover 20, the battery cell assembly 10, and the second end cover 30 expand in the first direction X. Under the tightening action of the first tie 41 and the second tie 42, the first end cover 20 and the second end cover 30 are fixed to the two ends of the battery cell assembly 10, thereby fixing a plurality of battery cells 11. It is worth noting that the present application does not limit the installation order of the first cable tie 41 and the second cable tie 42 , and one of them may be installed before the other, or both may be installed at the same time.

[0031] In some embodiments, see Figure 3 The first limiting portion 21 includes a first convex portion 211 and a first guide portion 212. The first convex portion 211 and the first guide portion 212 are arranged at intervals in the second direction Y to form a first limiting space, and the first guide portion 212 is located on the side of the first convex portion 211 away from the second limiting portion 22. The first cable tie 41 is arranged in the first limiting space. When the first cable tie 41 moves along the second direction Y, it enters the first limiting space after passing through the first guide portion 212. The first convex portion 211 is used to prevent the first cable tie 41 from continuing to move along the second direction Y, and the first guide portion 212 is in a wedge-shaped state. The first guide portion 212 can prevent the first cable tie 41 from exiting the first limiting space in the opposite direction of the second direction Y. That is, under the limiting action of the first convex portion 211 and the first guide portion 212, the first cable tie 41 is kept in the first limiting space, effectively preventing the first cable tie 41 from falling off.

[0032] In some embodiments, please refer to Figure 3The second limiting portion 22 includes a second convex portion 221 and a second guide portion 222. The second convex portion 221 and the second guide portion 222 are arranged at intervals in the second direction Y to form a second limiting space, and the second guide portion 222 is located on the side of the second convex portion 221 away from the first convex portion 211, and the second strap 42 is arranged in the second limiting space. When the second strap 42 moves in the reverse direction of the second direction Y, it enters the second limiting space after passing through the second guide portion 222. The second convex portion 221 is used to prevent the second strap 42 from continuing to move in the reverse direction of the second direction Y, and the second guide portion 222 is in a wedge-shaped state. The second guide portion 222 can prevent the second strap 42 from exiting the second limiting space in the second direction Y, that is, under the limiting action of the second convex portion 221 and the second guide portion 222, the second strap 42 is kept in the second limiting space, effectively preventing the second strap 42 from falling off.

[0033] In some embodiments, see Figure 5 The third limiting portion 31 includes a third protrusion 311 and a third guide portion 312. The third protrusion 311 and the third guide portion 312 are arranged at intervals in the second direction Y to form a third limiting space, and the third guide portion 312 is located on the side of the third protrusion 311 away from the fourth limiting portion 32. The first cable tie 41 is arranged in the third limiting space. When the first cable tie 41 moves along the second direction Y, it enters the third limiting space after passing through the third guide portion 312. The third protrusion 311 is used to prevent the first cable tie 41 from continuing to move along the second direction Y, and the third guide portion 312 is in a wedge-shaped state. The third guide portion 312 can prevent the first cable tie 41 from exiting the third limiting space in the opposite direction of the second direction Y. That is, under the limiting action of the third protrusion 311 and the third guide portion 312, the first cable tie 41 is kept in the third limiting space, effectively preventing the first cable tie 41 from falling off.

[0034] In some embodiments, please refer to Figure 5 The fourth limiting portion 32 includes a fourth protrusion 321 and a fourth guide portion 322. The fourth protrusion 321 and the fourth guide portion 322 are arranged at intervals in the second direction Y to form a fourth limiting space, and the fourth guide portion 322 is located on the side of the fourth protrusion 321 away from the third protrusion 311. The second strap 42 is arranged in the fourth limiting space. When the second strap 42 moves in the reverse direction of the second direction Y, it enters the fourth limiting space after passing through the fourth guide portion 322. The fourth protrusion 321 is used to prevent the second strap 42 from continuing to move in the reverse direction of the second direction Y, and the fourth guide portion 322 is in a wedge-shaped state. The fourth guide portion 322 can prevent the second strap 42 from exiting the fourth limiting space in the second direction Y. That is, under the limiting action of the fourth protrusion 321 and the fourth guide portion 322, the second strap 42 is kept in the fourth limiting space, effectively preventing the second strap 42 from falling off.

[0035] In some embodiments, the first cable tie 41 is an integrally formed continuous ring-shaped steel belt, and / or the second cable tie 42 is an integrally formed continuous ring-shaped steel belt. The continuous ring-shaped steel belt helps to improve the bundling strength of the first cable tie 41 and the second cable tie 42, reduce the risk of the first cable tie 41 and the second cable tie 42 breaking, and improve the safety performance of the battery device 100.

[0036] In some embodiments, see Figure 1 and Figure 3 The cable tie assembly 40 includes a first protective member 43 and a second protective member 44. The first protective member 43 is disposed between the first cable tie 41 and the battery cell assembly 10. The first protective member 43 is used to separate the first cable tie 41 and the battery cell assembly 10, thereby preventing the burrs on the first cable tie 41 from damaging the battery cell assembly 10 and causing the battery cell assembly 10 to short-circuit. The second protective member 44 is disposed between the second cable tie 42 and the battery cell assembly 10. The second protective member 44 is used to separate the second cable tie 42 and the battery cell assembly 10, thereby preventing the burrs on the second cable tie 42 from damaging the battery cell assembly 10 and causing the battery cell assembly 10 to short-circuit. In some embodiments, the first protective member 43 is an insulating sleeve, which is sleeved on the first cable tie 41; the second protective member 44 is an insulating sleeve, which is sleeved on the second cable tie 42.

[0037] In some embodiments, see Figure 1 , Figure 2 and Figure 4 The heating assembly 50 includes a first heating film 51 and a second heating film 52. The first heating film 51 and the second heating film 52 are respectively arranged on both sides of the battery cell assembly 10 along the third direction Z, and the first heating film 51 and the second heating film 52 are bonded and connected to at least two or more battery cells 11, wherein the first direction X, the second direction Y and the third direction Z are perpendicular to each other. Compared with the structure in which the first heating film 51 and the second heating film 52 are connected to the battery cell assembly 10 through the first tie 41 and the second tie 42, in this embodiment, the first heating film 51 and the second heating film 52 are directly bonded and arranged on the surface of the battery cell 11, so that the absorption of heat by the first tie 41 and the second tie 42 can be reduced, so as to reduce the heat loss of the first heating film 51 and the second heating film 52, thereby improving the heating efficiency of the battery cell assembly 10.

[0038] In further embodiments, see Figure 3 , along the second direction Y, the first heating film 51 and the first tie 41 and the second tie 42 are spaced apart; and / or, refer to Figure 5, along the second direction Y, the second heating film 52 is spaced from the first tie 41 and the second tie 42. Through the above structure, the first heating film 51 does not contact the first tie 41 and the second tie 42, and the second heating film 52 does not contact the first tie 41 and the second tie 42, so that the heat of the first heating film 51 and the second heating film 52 is transferred to the battery cell assembly 10 as directly as possible, thereby improving the heating efficiency.

[0039] In some embodiments, see Figure 1 The battery cell assembly 10 also includes a box 12 and a plurality of heat insulating members 13. A plurality of battery cells 11 are arranged in the box 12, and the box 12 supports the battery cells 11. A heat insulating member 13 is arranged between two adjacent battery cells 11. The heat insulating member 13 is used to reduce the heat transfer between the two adjacent battery cells 11, and reduce the risk that the temperature of one battery cell 11 abnormally increases, causing the temperature of other adjacent battery cells 11 to also increase. The heat insulating member 13 also has a buffering effect, reducing the risk of direct collision between two adjacent battery cells 11, and improving the safety performance of the battery device 100.

[0040] In some embodiments, see Figure 1 and Figure 2 The battery device 100 further includes an electric control assembly 60 and a top cover 70. The electric control assembly 60 is disposed at the end of the battery cell assembly 10 along the second direction Y. The electric control assembly 60 is electrically connected to the battery cell assembly 10 so that a plurality of battery cells 11 are connected in series, in parallel, or in series and in parallel to increase the rated capacity or rated voltage of the battery cell assembly 10. The top cover 70 is disposed on a side of the electric control assembly 60 away from the battery cell assembly 10. The top cover 70 is used to cover the electric control assembly 60 to prevent the electric control assembly 60 from being exposed to the outside and to improve the safety of the electric control assembly 60.

[0041] The present application also provides a photovoltaic system embodiment, which includes a battery device 100. The battery device 100 is used to store electrical energy converted from light energy and provide electrical energy to electrical equipment. For the structure and function of the battery device 100, please refer to any of the above embodiments, which will not be repeated here.

[0042] In some embodiments, see Figure 6 The present application further provides a method for assembling a battery device, which is used to assemble and manufacture the battery device in any of the above embodiments. The assembly method comprises:

[0043] Step S1: stacking a first end cover, a plurality of battery cells and a second end cover along a first direction to form a first whole, wherein the plurality of battery cells are located between the first end cover and the second end cover.

[0044] Step S2: Press the first whole body along the first direction with a preset pressure, and sleeve the cable tie assembly on the first whole body along the second direction, wherein the first direction and the second direction are perpendicular; specifically, sleeve the first cable tie in the cable tie assembly on the first whole body along the second direction, and sleeve the second cable tie in the cable tie assembly on the first whole body in the opposite direction of the second direction. The first cable tie and the second cable tie can be sleeved on the first whole body one before the other, or can be sleeved on the first whole body at the same time.

[0045] Step S3: disposing a heating component on the side of the first unit in a third direction, and the heating component is bonded and connected to at least a number of battery cells, wherein the third direction is perpendicular to the first direction and the second direction respectively.

[0046] Step S4: disposing an electric control component at the end of the first unit in the second direction, and the electric control component connects a plurality of battery cells in series and / or in parallel.

[0047] In some embodiments, before the step of stacking the first end cover, the plurality of battery cells and the second end cover in a first direction to form a first integral body, wherein the plurality of battery cells are located between the first end cover and the second end cover, the assembly method further comprises:

[0048] Step S5: Pre-test several battery cells. The pre-test of battery cells includes but is not limited to: confirming that the positive and negative electrodes on the battery cells are free of dirt, foreign matter, and damage; the QR code on the battery cells is clear and complete, and the explosion-proof valve is intact; and testing the voltage difference and internal resistance difference of all battery cells. If the voltage difference is less than or equal to 3mv and the internal resistance difference is less than or equal to 0.03mΩ, it means that all battery cells are qualified. By pre-testing the battery cells to ensure that the structure and function of the battery cells are normal before subsequent assembly, the probability of thermal runaway of the battery device can be reduced.

[0049] In some embodiments, after the step of disposing the electric control assembly at the end of the first unit in the second direction and connecting a plurality of battery cells in series and / or in parallel, the assembly method further comprises:

[0050] Step S6: Perform communication detection on the battery device. By performing communication detection on the battery device, it is confirmed that each battery cell in the battery device is connected to the circuit, and that the electrical signal output by the electronic control component is within the normal range; finally, the test data is uploaded to the MES system (manufacturing execution system) for easy traceability.

[0051] The battery device 100 of the embodiment of the present application includes a battery cell assembly 10, a first end cap 20, a second end cap 30, a tie assembly 40 and a heating assembly 50. The battery cell assembly 10 includes a plurality of battery cells 11 stacked and arranged along a first direction X; the first end cap 20 and the second end cap 30 are respectively arranged at the two ends of the battery cell assembly 10 in the first direction X; the tie assembly 40 is arranged around the periphery of the battery cell assembly 10, the first end cap 20 and the second end cap 30; the heating assembly 50 is arranged on the surface of the battery cell assembly 10 and / or the tie assembly 40, and the heating assembly 50 is used to heat the battery cell assembly 10. By setting the tie assembly 40, the battery cell assembly 10 is fixed to the first end cap 20 and the second end cap 30, thereby improving the firmness and stability of the battery device 100; by setting the heating assembly 50 on the battery cell assembly 10, the problem that the battery cell assembly 10 in the battery device 100 is difficult to start normal energy storage and power supply under cold conditions can be solved.

[0052] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A battery cell assembly, comprising a plurality of battery cells stacked along a first direction; A first end cover and a second end cover are respectively arranged at two ends of the battery cell assembly in the first direction; A cable tie assembly is arranged around the outer periphery of the battery core assembly, the first end cover and the second end cover; the cable tie assembly includes a first cable tie and a second cable tie, the first cable tie and the second cable tie are arranged at intervals along a second direction, and the second direction is perpendicular to the first direction; The first end cover is provided with a first limiting portion and a second limiting portion spaced apart in the second direction, the second end cover is provided with a third limiting portion and a fourth limiting portion spaced apart in the second direction, the first strap abuts against the first limiting portion and the third limiting portion at the same time, and the second strap abuts against the second limiting portion and the fourth limiting portion at the same time; A heating component is arranged on the surface of the battery core component and / or the cable tie component, and the heating component is used to heat the battery core component.

2. The battery device according to claim 1, characterized in that: The first limiting portion includes a first convex portion and a first guide portion, the first convex portion and the first guide portion are spaced apart in the second direction to form a first limiting space, and the first guide portion is located on a side of the first convex portion away from the second limiting portion, and the first cable tie is arranged in the first limiting space; and / or, The second limiting portion includes a second protrusion and a second guide portion, the second protrusion and the second guide portion are spaced apart in the second direction to form a second limiting space, and the second guide portion is located on a side of the second protrusion away from the first limiting portion, and the second cable tie is arranged in the second limiting space.

3. The battery device according to claim 1, characterized in that: The first cable tie is an integrally formed continuous ring-shaped steel belt, and / or the second cable tie is an integrally formed continuous ring-shaped steel belt.

4. The battery device according to claim 1, characterized in that: The cable tie assembly includes a first protective member and a second protective member, wherein the first protective member is disposed between the first cable tie and the battery cell assembly, and the second protective member is disposed between the second cable tie and the battery cell assembly.

5. The battery device according to any one of claims 1 to 4, characterized in that: The heating assembly comprises a first heating film and a second heating film. Along a third direction, the first heating film and the second heating film are respectively arranged on both sides of the battery core assembly and are bonded and connected with at least two battery cells. The first direction and the second direction are perpendicular to the third direction in pairs. Along the second direction, the first heating film is spaced apart from the first strap and the second strap; And / or, the second heating film is spaced apart from the first tie and the second tie.

6. The battery device according to claim 5, characterized in that: The battery cell assembly further comprises a box and a plurality of heat insulating members, the plurality of battery cells are arranged in the box, and the heat insulating member is arranged between two adjacent battery cells; The battery device further comprises an electric control assembly and a top cover. The electric control assembly is arranged at the end of the battery cell assembly along the second direction and is electrically connected to the battery cell. The top cover is arranged on a side of the electric control assembly away from the battery cell assembly.

7. A photovoltaic system, characterized in that: Comprising a battery device as claimed in any one of claims 1 to 6.

8. A method for assembling a battery device, characterized in that: Comprising the battery device according to any one of claims 1 to 7, the assembling method comprising: Stacking a first end cover, a plurality of battery cells, and a second end cover in a first direction to form a first integral body, wherein the plurality of battery cells are located between the first end cover and the second end cover; The first integral body is pressed along a first direction with a preset pressure, and the cable tie assembly is sleeved on the first integral body along a second direction, wherein the first direction is perpendicular to the second direction; The heating component is arranged on the side of the first whole in the third direction, and the heating component is at least connected to the plurality of battery cells, wherein the third direction is perpendicular to the first direction and the second direction respectively; The electric control component is arranged at the end of the first whole in the second direction, and the electric control component connects the plurality of battery cells in series and / or in parallel.

9. The assembly method according to claim 8, characterized in that: Before the step of stacking the first end cover, the plurality of battery cells and the second end cover in a first direction to form a first integral body, wherein the plurality of battery cells are located between the first end cover and the second end cover, the assembly method further comprises: pre-testing the plurality of battery cells; and / or, After the step of arranging the electric control component at the end of the first whole in the second direction and the electric control component connecting the plurality of battery cells in series and / or in parallel, the assembly method further comprises: performing communication detection on the battery device.

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