Battery assembly

Abstract

The utility model discloses a battery assembly. The battery assembly comprises a front plate, a back plate, a battery cell group and a conductive adhesive tape, a battery cell mounting space is defined between the front plate and the back plate; the battery cell group is located in the battery cell mounting space, the battery cell group and the front plate are relatively fixed, the space between the battery cell group and the back plate is filled with a packaging adhesive film, an edge space is formed between the peripheral edge of the battery cell group and the outer contour edge of the front plate, and the edge space is filled with a sealing body; wherein the width of the edge space is L, and L is larger than or equal to 5mm and smaller than or equal to 24mm; the conductive adhesive tape is laid along the edge of a part of the battery cell group, is connected with a bus bar, and is used for being connected with an electric device through the bus bar. According to the battery assembly disclosed by the utility model, the conductive adhesive tape is laid along the edge of the battery cell group aiming at the battery assembly with a narrow clear edge, so that the problem that the edge of the battery cell group is easy to demould is solved.

Description

Technical Field

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

[0002] Although traditional silicon-based solar cells dominate the photovoltaic field, their high manufacturing costs and energy-consuming production processes limit their further popularization.

[0003] Under this background, perovskite solar cells have quickly become a new star in the photovoltaic field and received wide attention due to their advantages such as low material cost, high absorption coefficient, simple preparation process, and long carrier diffusion length. However, currently, the power generation efficiency of perovskite solar cell assemblies is low. To solve the problem of low power generation efficiency of perovskite solar cell assemblies, a narrow clear edge is left for the battery assembly. However, during the lamination process, the edge glass of the battery assembly with a narrow clear edge will rebound, and it is easy to occur the problem of delamination caused by the disconnection of the interface between the battery electron transport layers C60 and SnO2 at the edge of the perovskite solar cell. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a battery assembly. For a narrow clear edge battery assembly with 5mm ≤ L ≤ 24mm set between the four peripheral edges of the battery cell group and the outer contour edge of the front plate, a conductive tape is laid along the edge of the battery cell group to reduce the problem of easy delamination at the edge of the battery cell group.

[0005] The battery assembly according to an embodiment of the utility model includes: a front plate, a back plate, a battery cell group, and a conductive tape; a battery cell installation space is defined between the front plate and the back plate, the battery cell group is located in the battery cell installation space, the battery cell group is relatively fixed with the front plate, and an encapsulation film is filled between the battery cell group and the back plate. An edge space is formed between the four peripheral edges of the battery cell group and the outer contour edge of the front plate, a sealing body is filled in the edge space, the width of the edge space is L, and it satisfies: 5mm ≤ L ≤ 24mm; the conductive tape is laid along part of the edge of the battery cell group, and the conductive tape is connected with a bus bar, and the bus bar is used to connect an electrical device.

[0006] According to the battery assembly of the embodiment of the utility model, by defining the distance between the battery cell group and the outer contour edge of the front plate as 5mm ≤ L ≤ 24mm, this distance is the clear edge distance, so as to increase the surface area of the battery cell group and improve the power generation efficiency. While improving the power generation efficiency, the narrow clear edge is prone to the problem of delamination at the edge of the battery cell. By laying the conductive tape along the edge of the battery cell group to cover the battery cell group, the problem of delamination caused by the disconnection between the battery electron transport layers C60 and SnO2 at the edge of the battery cell group when the edges of the front plate and the back plate deform and rebound is reduced.

[0007] For a battery assembly according to an embodiment of the present utility model, the conductive tape includes a first conductive tape and a second conductive tape, the battery cell group includes a plurality of sub-battery units, and the plurality of sub-battery units are sequentially distributed along a first direction; the battery cell group further includes a first electrode and a second electrode, the first electrode is located at one end of the plurality of sub-battery units along the first direction, the second electrode is located at the other end of the plurality of sub-battery units along the first direction, the first conductive tape is connected between the first electrode and the encapsulation film, the second conductive tape is connected between the second electrode and the encapsulation film, and the conductive tape is electrically connected to a bus bar.

[0008] For a battery assembly according to an embodiment of the present utility model, the outer edge of the first conductive tape is aligned with the outer edge of the first electrode, and the outer edge of the second conductive tape is aligned with the outer edge of the second electrode.

[0009] For a battery assembly according to an embodiment of the present utility model, the encapsulation film covers the battery cell group and wraps the edge of the battery cell group, the encapsulation film bonds to the back plate and is arranged with a gap from the sealing body.

[0010] For a battery assembly according to an embodiment of the present utility model, the thickness of the encapsulation film is greater than the thickness of the first conductive tape or the second conductive tape.

[0011] For a battery assembly according to an embodiment of the present utility model, the width of at least one of the first electrode and the second electrode along the first direction is less than the width of the sub-battery unit.

[0012] For a battery assembly according to an embodiment of the present utility model, the sealing body is an elastic member, and the elastic modulus of the elastic member is 5 - 10 Mpa.

[0013] For a battery assembly according to an embodiment of the present utility model, the back plate is tempered glass, and the tempering degree of the tempered glass is 4 - 10 N / cm, and the Mohs hardness is 6 - 10 grades.

[0014] For a battery assembly according to an embodiment of the present utility model, the bus bar is attached between the battery cell group and the encapsulation film or the bus bar is attached to the front plate.

[0015] For a battery assembly according to an embodiment of the present utility model, the back plate is provided with an outlet hole, and the bus bar extends out along the outlet hole.

[0016] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0017] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, where:

[0018] Figure 1 is a schematic structural view of a bus bar of a battery assembly according to an embodiment of the present utility model being attached to a front plate;

[0019] Figure 2 is a schematic structural view of a bus bar of a battery assembly according to an embodiment of the present utility model being attached to a battery cell group;

[0020] Figure 3 is a schematic structural view of a battery cell group of a battery assembly according to an embodiment of the present utility model being connected to a front plate;

[0021] Figure 4 is a schematic structural view of a connection structure of a battery cell group of a battery assembly according to an embodiment of the present utility model to a front plate and a back plate.

[0022] Reference numerals:

[0023] Battery assembly 100,

[0024] Battery cell group 1, sub - battery cell unit 11, first electrode 12, second electrode 13, conductive tape 2, first conductive tape 21, second conductive tape 22, bus bar 3, front plate 4, back plate 5, encapsulation adhesive film 6, seal 7. Detailed description of the specific embodiment

[0025] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0026] Below, with reference to Figures 1 - 4 Describe the battery assembly 100 according to an embodiment of the present utility model. By defining the distance between the outer contour edge of the battery cell group 1 and the front plate 4 as 5 mm ≤ L ≤ 24 mm, the minimum clear - edge distance is defined, thereby increasing the surface area of the battery cell group 1, improving the power generation efficiency, and laying the conductive tape 2 along part of the edge of the battery cell group 1 to cover the edge of the battery cell, reducing the problem that the edge of the battery cell group 1 with a small clear - edge is prone to film peeling during lamination.

[0027] As Figures 1 - 4As shown in the figure, the battery module 100 according to an embodiment of the present utility model includes: a front plate 4, a back plate 5, a battery cell group 1, and a conductive tape 2; a battery cell installation space is defined between the front plate 4 and the back plate 5; the battery cell group 1 is located in the battery cell installation space, the battery cell group 1 is relatively fixed to the front plate 4 and a packaging film 6 is filled between the battery cell group 1 and the back plate 5, an edge space is formed between the four peripheral edges of the battery cell group 1 and the outer contour edge of the front plate 4, and a sealing body 7 is filled in the edge space; wherein, the width of the edge space is L, and it satisfies: 5mm ≤ L ≤ 24mm; the conductive tape 2 is laid along the edge of part of the battery cell group 1, and the conductive tape 2 is connected with a bus bar 3, and the bus bar 3 is used to connect an electrical device.

[0028] In practice, the battery module 100 of the embodiment of the present utility model is for a perovskite battery. The perovskite battery is a solar battery that uses an organic metal halide semiconductor of the perovskite type as a light-absorbing material, belonging to the third generation of solar batteries, also known as a new concept solar battery; the perovskite battery is arranged between the front plate 4 and the back plate 5, and the front plate 4 is the incident surface of sunlight. The perovskite solar battery sequentially includes a transparent conductive layer, an electron transport layer, a perovskite layer, a hole transport layer, and a metal electrode from the incident surface.

[0029] Specifically, a battery cell group 1 is arranged between the front plate 4 and the back plate 5. The packaging film 6 is used to protect the battery cell group 1 and can be waterproof and antioxidant. The back plate 5 can block air and water vapor. After the battery cell group 1 is arranged between the front plate 4 and the back plate 5, and a sealing body 7 is arranged around for sealing packaging, so that the battery cell group 1 is isolated from the outside world to jointly protect the battery module 100; and the embodiment of the present utility model defines that the distance of the edge space formed between the four peripheral edges of the battery cell group 1 and the outer contour edge of the front plate 4 is 5mm ≤ L ≤ 24mm. For example, when the front plate 4 and the battery cell group 1 are configured as a square, the clear edge distances on the four sides can be 24mm / 11mm / 11mm / 11mm respectively, and the wider side is used to stick the bus bar 3; when small clear edge treatments are performed on the four sides of the battery module 100, the clear edge distances on the four sides can be 5mm / 5mm / 5mm / 5mm respectively. At this time, both the conductive tape 2 and the bus bar 3 are stuck on the film surface of the battery cell group 1. By limiting the small clear edge distance, the light-receiving area of the battery cell group 1 is increased, the surface area of the battery cell group 1 is increased, and the power generation efficiency is improved. When no conductive material is arranged on the outer periphery of the battery cell group 1, the clear edge distance at this time is also the creepage distance. Then, limiting the clear edge distance means limiting the creepage distance, and the limitation of the creepage distance can also improve the electrical safety and extend the battery life. For example, the creepage distance of the embodiment of the present utility model is about 5 - 20mm to meet the electrical safety requirements.

[0030] In addition, the sealant 7 at the edge is disposed around the periphery of the battery cell group 1 and is provided corresponding to the region of the minimum creepage distance, facilitating the control of the internal environment of the battery cell group 1, preventing the entry of gases, moisture, etc., so as to improve the power generation stability and power generation efficiency. Moreover, when the battery assembly 100 is squeezed, the sealant 7 can also protect the battery cell group 1 to reduce the problem of film peeling at the edge of the battery cell group 1.

[0031] The narrow clear edge achieves high power generation efficiency, but it is prone to the problem of film peeling at the edge of the battery cell group 1. When the conductive tape 2 is laid along the edge of the battery cell group 1 to cover a part of the edge of the battery cell, it can not only achieve the electrical connection between the conductive tape 2 and the battery cell group 1, and the conductive tape 2 is connected to the bus bar 3. The bus bar 3 has the function of conducting and collecting electricity. The battery cell group 1 is connected to an external electrical device through the bus bar 3, thereby realizing power transmission. Also, after the conductive tape 2 is laid along the edge, it can reduce the problem of film peeling caused by the disconnection between the battery electron transport layers C60 and SnO2 at the edge of the battery cell group 1.

[0032] In some embodiments, the battery assembly 100 further includes a conductive tape 2. The conductive tape 2 includes a first conductive tape 21 and a second conductive tape 22. The battery cell group 1 includes a plurality of sub-battery units 11, and the plurality of sub-battery units 11 are sequentially distributed in a first direction; the battery cell group 1 further includes a first electrode 12 and a second electrode 13. The first electrode 12 is located at one end of the plurality of sub-battery units 11 in the first direction, and the second electrode 13 is located at the other end of the plurality of sub-battery units 11 in the first direction. The first conductive tape 21 is connected between the first electrode 12 and the encapsulation film 6, and the second conductive tape 22 is connected between the second electrode 13 and the encapsulation film 6. The conductive tape 2 is electrically connected to a bus bar 3.

[0033] Wherein, the first electrode 12 is the positive electrode, the second electrode 13 is the negative electrode, and the plurality of sub-battery units 11 between the first electrode 12 and the second electrode 13 are connected in series in sequence. The first conductive tape 21 is connected to the positive electrode, the second conductive tape 22 is connected to the negative electrode. The first conductive tape 21 and the second conductive tape 22 are connected through two bus bars 3, that is, the two bus bars 3 are respectively connected to the positive electrode and the negative electrode. The battery cell group 1 is connected to an external electrical device through the two bus bars 3, thereby realizing power transmission.

[0034] Moreover, the first conductive tape 21 and the second conductive tape 22 are covered by the encapsulation film 6, improving the integrity of the edge position of the battery cell group 1 and further reducing the problem of film peeling at the edges of the first electrode 12 and the second electrode 13.

[0035] In some embodiments, the outer edge of the first conductive tape 21 is aligned with the outer edge of the first electrode 12, and the outer edge of the second conductive tape 22 is aligned with the outer edge of the second electrode 13.

[0036] In practice, the first conductive tape 21 is aligned and connected along the outer side of the first electrode 12, and the second conductive tape 22 is aligned and connected along the outer side of the second electrode 13, that is, the edge part of the battery cell group 1 is covered, so that the edge part is not exposed. The film surface edge of the battery cell group 1 is pressed by the conductive tape 2. When laminating and the back plate 5 rebounds, the stress pulling effect of the encapsulation adhesive film 6 on the film surface of the battery cell group 1 is inhibited, thereby reducing the risk of film peeling.

[0037] Among them, the front plate 4 and the back plate 5 of the embodiment of the present invention are both made of glass materials. For example, when the laminating cloth on the upper layer of the laminator causes the glass at the edge of the back plate 5 to bend and warp during lamination, and during the lamination cooling process, the edge of the back plate 5 rebounds, driving the interface between the battery electron transport layers C60 and SnO2 to separate, resulting in film peeling between the internal component layers of the battery cell group 1; thus, by aligning the first conductive tape 21 with the outer side of the first electrode 12 and the second conductive tape 22 with the outer side of the second electrode 13, when the edge of the back plate 5 rebounds, due to the protection of the first conductive tape 21 and the second conductive tape 22 on the edge position of the battery cell group 1, the risk of film peeling at the edge position of the battery cell group 1 is reduced.

[0038] Moreover, the first conductive tape 21 is aligned with the outer side of the first electrode 12, and the second conductive tape 22 is aligned with the outer side of the second electrode 13, which can also prevent the first conductive tape 21 and the second conductive tape 22 from being set outside the battery cell group 1 and shortening the creepage distance, resulting in the problem of electrical safety due to too short creepage distance. Therefore, such a connection method of the first conductive tape 21 and the second conductive tape 22 can control the creepage distance within a safe range, that is, the clear edge distance is controlled within the range that can improve the power generation efficiency of the battery cell group 1, and at the same time, it can also prevent the problem of film peeling of the battery cell group 1.

[0039] In some embodiments, the encapsulation adhesive film 6 covers the battery cell group 1 and wraps the edge of the battery cell group 1. The encapsulation adhesive film 6 bonds to the back plate 5 and is arranged with a gap from the seal body 7.

[0040] In practice, referring to Figure 4 As shown, the encapsulation adhesive film 6 covers the battery cell group 1 and wraps the edges of the first conductive tape 21 and the second conductive tape 22. Of course, it also covers other edge areas of the battery cell group 1, reducing the risk of film peeling of the battery cell group 1; at the same time, the encapsulation adhesive film 6 bonds to the back plate 5 and is arranged with a gap from the seal body 7. The encapsulation adhesive film 6 and the seal body 7 need to maintain a gap and avoid contact as much as possible, preventing the encapsulation adhesive film 6 from being squeezed and wrinkled during lamination, resulting in poor appearance, and also avoiding contact with the seal body 7 and causing discoloration of the contact surface. The function of the encapsulation adhesive film 6 is to completely cover the battery cell group 1 to form an encapsulation layer for waterproof and oxygen protection.

[0041] In some embodiments, the thickness of the encapsulation adhesive film 6 is greater than the thickness of the first conductive tape 21 or the second conductive tape 22.

[0042] In practice, with reference to Figure 4 As shown, the encapsulation film 6 covers a plurality of sub-cell units 11, and at the same time covers the first conductive tape 21 and the second conductive tape 22. The thickness of the encapsulation film 6 is set to be relatively thick, which can not only connect the first conductive tape 21 connecting the encapsulation film 6 and the first electrode 12, but also connect the second conductive tape 22 connecting the encapsulation film 6 and the second electrode 13. At the same time, it can also connect the encapsulation film 6 with a plurality of sub-cell units 11 between the first electrode 12 and the second electrode 13. The encapsulation film 6 improves the integrity of the entire battery cell group 1, and can protect and connect the entire battery cell group 1, the first conductive tape 21, and the second conductive tape 22. That is, the encapsulation film 6 can cover the first conductive tape 21 and the second conductive tape 22 and the thickness is not too thin, so as to enhance the stability at the edge of the battery cell group 1 and reduce the risk of film peeling.

[0043] In some embodiments, the width of at least one of the first electrode 12 and the second electrode 13 along the first direction is less than the width of the sub-cell unit 11.

[0044] Specifically, the first electrode 12 can be set to a structure that cannot generate electricity, and the second electrode 13 is a sub-cell unit 11 that generates electricity among a plurality of sub-cell units 11. The width of the first electrode 12 is set differently from the widths of the other plurality of sub-cell units 11 used for generating electricity. Since the first conductive tape 21 is attached to the area corresponding to the first electrode 12, the area corresponding to the first electrode 12 is a non-electricity generating area, that is, the first electrode 12 does not include a perovskite layer. Setting the width of the first electrode 12 to be less than the width of each other sub-cell unit 11 can reduce the area of the ineffective area, and thus increase the overall power generation area of the battery cell group 1.

[0045] In some embodiments, the seal 7 is an elastic member, and the elastic modulus of the elastic member is 5-10 Mpa.

[0046] In practice, for example, the material of the elastic member can be set as butyl rubber material. Butyl rubber has good airtightness, durability, aging resistance, stability, safety and environmental protection, and butyl rubber has the characteristic of high elastic modulus. Resin, modifiers, etc. can be added to the butyl rubber to control the elastic modulus of the butyl rubber within the range of 5-10 MPa. That is, using the seal 7 with a high elastic modulus can be used to suppress the warping deformation of the edge of the backplane 5 glass, thereby reducing the problem that the edge of the narrow-edge-cleared battery cell group 1 is prone to film peeling.

[0047] In addition, a gap is left between the sealing body 7 and the battery cell group 1. When multiple battery cell groups 1 are arranged between the front plate 4 and the back plate 5, the battery cell group 1 will generate or absorb heat, and thermal expansion may occur. By leaving a gap between the sealing body 7 and the battery cell group 1, a deformation space is provided for the battery cell group 1 when it expands due to heat.

[0048] In some embodiments, the back plate 5 is tempered glass, and the tempering degree of the tempered glass is 4 - 10 N / cm, and the Mohs hardness is 6 - 10 grades.

[0049] Among them, the tempered glass has high strength, safety, and thermal stability. At this time, optimizing the hardness of the back plate 5 glass reduces the deformation degree of the tempered glass itself and reduces the problem that the edge of the tempered glass is prone to warping, thereby preventing the problem of film peeling caused by the interface detachment between the battery electron transport layers C60 and SnO2 due to the edge rebound of the tempered glass. That is, by setting the tempering degree and hardness of the tempered glass, the stability between the internal component layers of the battery cell group 1, especially the edge battery cell group 1, can be improved.

[0050] In some embodiments, the bus bar 3 is attached between the battery cell group 1 and the encapsulation adhesive film 6 or the bus bar 3 is attached to the front plate 4.

[0051] In practice, when the bus bar 3 is attached to multiple sub - battery units 11 along the arrangement direction of the multiple sub - battery units 11, when the position of the wire outlet hole is set on the back plate 5, the bus bar 3 is connected to the side of the multiple sub - battery units 11 close to the back plate 5 along the distribution direction of the multiple sub - battery units 11 and the contact surface between the two is kept insulated. At this time, the setting of the bus bar 3 does not affect the setting of the creepage distance, and the creepage distance still remains within the distance range from the battery cell group 1 to the edge of the front plate 4; when the bus bar 3 is connected to the front plate 4 along the distribution direction of the multiple sub - battery units 11, the creepage distance is then the distance between the bus bar 3 and the edge of the front plate 4, and the creepage distance can be set at 5 - 20 mm to meet the electrical safety requirements and prevent the occurrence of short - circuit problems.

[0052] As Figure 1 shown, the bus bar 3 is attached to the front plate 4 along the distribution direction of the multiple sub - battery units 11. As Figure 2 shown, the bus bar 3 is attached to the film surfaces of the multiple sub - battery units 11 along the distribution direction of the multiple sub - battery units 11, which is equivalent to strengthening the film surfaces of the multiple sub - battery units 11 and reducing the risk of film peeling of the battery cell group 1; when the bus bar 3 is attached to the front plate 4 along the arrangement direction of the multiple sub - battery units 11, it can still play the role of conducting and aggregating electricity while meeting the setting of the creepage distance.

[0053] In some embodiments, the back plate 5 is provided with a wire outlet hole, and the bus bar 3 extends out along the wire outlet hole.

[0054] Specifically, the first conductive tape 21 and the second conductive tape 22 are connected to one side of the battery cell group 1 close to the back plate 5. Then, when the bus bar 3 is arranged on one side of multiple sub-battery units 11 close to the back plate 5, an outlet hole can be arranged on the back plate 5, which can more conveniently extend the bus bar 3 along the outlet hole and connect it to other electrical devices. For example, the outlet hole is arranged at the middle position of the back plate 5 along the arrangement direction of multiple sub-battery units 11. The bus bar 3 includes two sections, one section is connected to the first conductive tape 21, and the other section is connected to the second conductive tape 22, so that the positive and negative electrodes are electrically connected to the electrical device through the bus bar 3.

[0055] In addition, it should be noted that a liquid silicone can also be used instead of the encapsulation film 6, which can solve the demoulding problem. However, the liquid silicone encapsulation process is relatively complex, the investment cost of the later encapsulation equipment is high, and the aging resistance performance of the encapsulated component is reduced. The problem of edge demoulding of the battery cell group 1 in the case of narrow clear edges can also be reduced by improving the transmission layer coating process and increasing the adhesion between C60 and tin oxide interfaces in the perovskite battery.

[0056] 1. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention 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 should not be construed as a limitation to the present invention.

[0057] 2. In the description of the present invention, the "first feature" and "second feature" may include one or more of such features.

[0058] 3. In the description of the present invention, the meaning of "a plurality" is two or more.

[0059] 4. In the description of the present invention, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include that the first and second features are not in direct contact but in contact through additional features therebetween.

[0060] 5. In the description of the present invention, the first feature being "above", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature.

[0061] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0062] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery assembly, characterized in that, Comprising: A front plate and a back plate, with a battery cell installation space defined between the front plate and the back plate; A battery cell group, which is located within the battery cell installation space. The battery cell group is relatively fixed to the front plate, and a packaging film is filled between the battery cell group and the back plate. An edge space is formed between the four peripheral edges of the battery cell group and the outer contour edge of the front plate. A sealing body is filled in the edge space. The width of the edge space is L, and it satisfies: 5mm ≤ L ≤ 24mm; A conductive tape, which is laid along the edge of part of the battery cell group, and the conductive tape is connected with a bus bar, and the bus bar is used to connect an electrical device.

2. The battery assembly according to claim 1, wherein, The conductive tape includes a first conductive tape and a second conductive tape. The battery cell group includes a plurality of sub-battery units, and the plurality of sub-battery units are sequentially distributed in a first direction; The battery cell group further includes a first electrode and a second electrode. The first electrode is located at one end of the plurality of sub-battery units along the first direction, and the second electrode is located at the other end of the plurality of sub-battery units along the first direction. The first conductive tape is connected between the first electrode and the packaging film, and the second conductive tape is connected between the second electrode and the packaging film. The conductive tape is electrically connected with a bus bar.

3. The battery assembly according to claim 2, characterized in that, The first conductive tape is aligned with the outer side edge of the first electrode, and the second conductive tape is aligned with the outer side edge of the second electrode.

4. The battery assembly according to claim 2, characterized in that, The packaging film covers the battery cell group and wraps the edge of the battery cell group. The packaging film bonds to the back plate and is arranged with a gap from the sealing body.

5. The battery assembly according to claim 2, wherein, The thickness of the packaging film is greater than the thickness of the first conductive tape or the second conductive tape.

6. The battery assembly according to claim 2, characterized in that The width of at least one of the first electrode and the second electrode along the first direction is less than the width of the sub-battery unit.

7. The battery assembly according to claim 1, characterized in that, The sealing body is an elastic member, and the elastic modulus of the elastic member is 5 - 10 Mpa.

8. The battery assembly according to claim 1, wherein, The back plate is tempered glass, and the tempering degree of the tempered glass is 4 - 10 N / cm, and the Mohs hardness is 6 - 10 grades.

9. The battery assembly according to claim 1, wherein, The bus bar is attached between the battery cell group and the packaging film or the bus bar is attached to the front plate.

10. The battery assembly according to claim 1, characterized in that, The back plate is provided with an outlet hole, and the bus bar extends along the outlet hole.

Images