Battery pack, battery pack and electric equipment

Abstract

The embodiment of the invention provides a battery pack, a battery pack and electric equipment, and relates to the technical field of batteries, the battery pack comprises a battery stacking body and at least one connecting assembly, and the battery stacking body comprises a plurality of batteries stacked along a first direction. The connecting assembly comprises a connecting piece and a bonding piece, the connecting piece extends in the first direction, and a connecting groove is formed in the side, facing the battery stack body, of the connecting piece. The bonding piece is located in the connecting groove, and at least the batteries located at the two ends of the battery stacking body in the first direction are connected with the connecting piece through the bonding piece. According to the battery pack provided by the embodiment of the invention, the binding pulling force is provided for the battery through the connecting assembly, so that the difference can be greatly reduced, the stability and controllability are realized, the better performance of the battery is ensured, and the cycle life is prolonged.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack, a battery package and an electrical device. Background Art

[0002] At present, battery packs are widely used in new energy vehicles, energy storage power stations and other electrical equipment because they can store and provide electrical energy.

[0003] In the related art, multiple batteries are stacked in the same direction and connected in series and parallel to form a battery pack, which is then packaged into a battery pack.

[0004] However, due to differences in battery thickness, the restraint force after assembly into a battery pack varies greatly, making it impossible to ensure optimal battery performance. Summary of the Invention

[0005] Based on this, the present application provides a battery pack, a battery package and an electrical device to solve the problem that the restraining force of existing battery packs varies greatly, affecting battery performance.

[0006] In a first aspect, the present application provides a battery pack, comprising a battery stack and at least one connection assembly, wherein the battery stack comprises a plurality of batteries stacked along a first direction;

[0007] The connecting assembly includes a connecting member and an adhesive member, wherein the connecting member extends along a first direction and has a connecting groove on a side of the connecting member facing the battery stack;

[0008] The adhesive member is located in the connecting groove, and at least the batteries located at two ends of the battery stack in the first direction are connected to the connecting member through the adhesive member.

[0009] In a possible implementation, the connecting member includes a base and two limiters connected to the base, and the base extends along a first direction;

[0010] The two limiting bodies are located on a side of the base body facing the battery stack and are spaced apart along a second direction to form a connection groove with the base body, and the second direction intersects with the first direction.

[0011] In a possible implementation, the base and / or the limiting body are transparent parts, and the adhesive member is a light-curing adhesive.

[0012] In a possible implementation, the material of the base and / or the limiter is at least one of PCM, PET, PP, and PE; and / or the light-curing adhesive is UV adhesive.

[0013] In a possible implementation, there are multiple connection assemblies, and multiple connection assemblies are provided on both sides of the battery stack along the third direction;

[0014] The connecting components are spaced apart along the second direction, and the third direction, the first direction and the second direction all intersect.

[0015] In a possible implementation, a plurality of connection assemblies located on both sides of the battery stack along the third direction are arranged to face each other.

[0016] In one possible implementation, the battery pack satisfies the following relationship:

[0017] G 胶剪切 *K cell有效 *n cell有效 *K pet *S pet有效 / η3>4800N;and 2MPa≤G 胶剪切 , 12mm≤K cell有效 , 1≤n cell有效 , 30mm≤K pet ≤60mm, 50%≤S pet有效 ≤100%, 1.0≤η3≤1.4;

[0018] Where: G 胶剪切 is the shear strength of the bond; K cell有效 is the effective bonding width of the battery along the first direction; n cell有效 K is the effective number of batteries connected to one side of the connector; pet S is the width of the connecting member along the second direction; pet有效 is the effective bonding percentage of the bonded parts; η3 is the overall safety factor.

[0019] In one possible implementation, the battery pack satisfies the following relationship:

[0020] 0≤[(1+η2)*F*S cell *(n cell -1)] / [1000*η1*n pet *K pet *H pet ]≤2mm; and G pet ≥3.59MPa, 0.3≤η2≤0.5, 0≤F≤4800N, 3mm≤S cell ≤5mm, n cell >2, 0.9≤η1≤1.1, 4≤n pet ≤8, 0.3mm≤H pet ≤2mm, 30mm<K pet ≤60mm;

[0021] Where: η2 is the expansion safety factor; F is the preset restraint force for multiple batteries; S cell is the gap between adjacent batteries; n cellis the number of batteries; η1 is the safety factor of the restraint force; n pet is the number of connectors; H pet K is the thickness of the connector along the third direction; pet is the width of the connecting member along the second direction.

[0022] In a possible implementation, a plurality of buffer members are further included, and the buffer members are filled between adjacent batteries.

[0023] In a possible implementation, at least one side plate is further included. Along the first direction, the side plate is located on one side of the battery stack, and a heat insulating member is filled between the side plate and adjacent batteries.

[0024] In a second aspect, the present application further provides a battery pack, comprising a tray and any one of the battery packs provided in the first aspect, wherein the battery pack is disposed in the tray.

[0025] In a third aspect, the present application further provides an electrical device comprising at least one battery pack provided in any one of the first aspect or the battery pack provided in the second aspect.

[0026] The battery pack, battery pack, and electrical equipment provided by the present application include a battery stack and at least one connecting assembly. The battery stack includes a plurality of batteries stacked along a first direction. The connecting assembly includes a connector and an adhesive. The connector is arranged to extend along the first direction, and a connecting groove is provided on the side of the connector facing the battery stack. The adhesive is arranged in the connecting groove to limit the bonding position. At least the batteries located at both ends of the battery stack in the first direction are connected to the connector via the adhesive, thereby providing a restraining tension to the batteries. As a result, the battery pack provided by the present application, by providing a restraining tension to the batteries through the connecting assembly, can significantly reduce differences, be stable and controllable, thereby ensuring that the batteries perform better and improve cycle life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0028] Figure 1 A schematic diagram of the exploded structure of a battery pack provided in an embodiment of the present application;

[0029] Figure 2 for Figure 1 Schematic diagram of the structure of the connecting parts;

[0030] Figure 3 for Figure 1 Schematic diagram of the connection structure between the battery and the connection component;

[0031] Figure 4 for Figure 3 Schematic diagram of the measurement method of the restraint tension;

[0032] Figure 5 for Figure 3 Schematic diagram of the measurement method of the ultimate restraining tension;

[0033] Figure 6 for Figure 3 Relationship diagram of the area ratio between the bonding parts and the connecting parts;

[0034] Figure 7 A schematic diagram of the partial structure of the battery pack provided in an embodiment of the present application.

[0035] Reference numerals:

[0036] 10: Battery pack;

[0037] 20: tray;

[0038] 30: battery pack;

[0039] 100: battery stack;

[0040] 110: battery;

[0041] 200: connection components;

[0042] 201: connection slot;

[0043] 210: Connector;

[0044] 211: matrix;

[0045] 212: limiter;

[0046] 220: adhesive parts;

[0047] 300: buffer parts;

[0048] 400: Side panels. DETAILED DESCRIPTION

[0049] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of methods and apparatus consistent with certain aspects of the present application, as detailed in the appended claims.

[0050] The terms "first," "second," "third," "fourth," etc. (if any) in the specification and claims of the present application and in the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential sequence. It should be understood that the numbers used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or apparatus.

[0051] As mentioned in the background section, existing battery pack structures place foam or aerogel of equal thickness between adjacent cells, or provide a certain amount of clearance to accommodate expansion. This variation in cell thickness results in significant variations in restraint force after assembly, preventing optimal battery performance and impacting the pack's cycle life.

[0052] In response to the above-mentioned problems existing in the prior art, the present application provides a battery pack, a battery pack, and an electrical device. The battery pack provided in the present application includes a battery stack and at least one connecting assembly. The battery stack includes a plurality of batteries stacked along a first direction. The connecting assembly includes a connector and an adhesive. The connector is arranged to extend along the first direction, and a connecting groove is provided on the side of the connector facing the battery stack. The adhesive is arranged in the connecting groove to limit the bonding position. At least the batteries located at both ends of the battery stack in the first direction are connected to the connector via the adhesive, providing a restraining tension to the batteries. That is, the restraining tension provided to the batteries by the connecting assembly can significantly reduce the difference, stabilize and control, thereby ensuring that the batteries perform better and improve the cycle life.

[0053] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0054] First, refer to Figures 1-6 As shown, an embodiment of the present application provides a battery pack, including a battery stack 100 and at least one connection assembly 200 , wherein the battery stack 100 includes a plurality of batteries 110 stacked along a first direction.

[0055] The connection assembly 200 includes a connection member 210 and an adhesive member 220 . The connection member 210 extends along a first direction. A connection groove 201 is formed on a side of the connection member 210 facing the battery stack 100 .

[0056] The adhesive member 220 is located in the connection groove 201 , and at least the batteries 110 located at two ends of the battery stack 100 in the first direction are connected to the connection member 210 via the adhesive member 220 .

[0057] The battery stack 100 in this embodiment can be formed by stacking a plurality of batteries 110 along a first direction, wherein the battery 110 is a substantially rectangular sheet or plate structure, and the battery 110 has a length, a width and a thickness, and the height is between the length and the thickness. Figure 1 As shown in the Y direction, the width of the battery 110 is as shown along Figure 1 As shown in the Z direction, the thickness of the battery 110 is Figure 1 The first direction is as shown in the X direction. Figure 1 As shown in the X direction, foam may be filled or gaps may be reserved between adjacent batteries 110 .

[0058] The connector 210 in this embodiment is used to connect the batteries 110 together. It can be in the form of a long strip or a thin plate, and extends along the stacking direction of the batteries 110. A connecting groove 201 is defined on the side of the connector 210 facing the battery stack 100 to position the adhesive 220. Furthermore, the width of the connecting groove 201 is the same at all locations in the first direction.

[0059] The adhesive 220 in this embodiment is used to adhere the side of the battery 110 to the connector 210 . The adhesive 220 may be a light-curing adhesive such as UV adhesive. The adhesive 220 is located in the connecting groove 201 and can accurately limit the bonding position.

[0060] Specifically, at least the batteries 110 located at both ends of the battery stack 100 in the first direction are connected to the connector 210 through the adhesive 220 to provide a stable restraining tension to the batteries 110. All batteries 110 can also be connected to the connector 210 through the adhesive 220, and the connecting component 200 can be set to one or more.

[0061] It can be understood that the application of the battery cell in this embodiment provides a restraining tension to the battery 110 through the connecting component 200, which can greatly reduce the difference and be stable and controllable, thereby ensuring that the battery 110 performs better and improves the cycle life.

[0062] Therefore, the battery cell provided in the embodiment of the present application includes a battery stack 100 and at least one connecting assembly 200, the battery stack 100 includes a plurality of batteries 110 stacked along a first direction, the connecting assembly 200 includes a connecting member 210 and an adhesive member 220, and the connecting member 210 is arranged to extend along the first direction, and a connecting groove 201 is arranged on the connecting member 210 facing the side of the battery stack 100, and the adhesive member 220 is arranged in the connecting groove 201 to limit the bonding position. At least the batteries 110 located at both ends of the battery stack 100 in the first direction are connected to the connecting member 210 through the adhesive member 220, providing a restraining tension to the batteries 110, that is, by providing a restraining tension to the batteries 110 through the connecting assembly 200, the difference can be greatly reduced, and the stability is controllable, thereby ensuring that the batteries 110 perform better and the cycle life is improved.

[0063] In some embodiments, the connecting member 210 includes a base 211 and two limiting bodies 212 connected to the base 211 , and the base 211 extends along a first direction.

[0064] The two limiting bodies 212 are located on a side of the base 211 facing the battery stack 100 and are spaced apart along a second direction to form a connection groove 201 with the base 211 . The second direction intersects the first direction.

[0065] Specifically, the base 211 and the limiting body 212 can be in the shape of a long strip, a thin plate, etc., and can be made of PCM, PET, PP, PE or other materials with high elastic modulus and tensile and shear strength. Both extend along the first direction, and the two limiting bodies 212 are also spaced apart along the second direction, which is perpendicular to the first direction. Figure 2 The two limiting bodies 212 are connected to the base 211 on one side facing the battery stack 100 , and the opening between the two is used to place the adhesive 220 .

[0066] The thickness of the substrate 211 can be 0.2≤H pet ≤1mm, width can be 5mm≤K pet ≤60mm, the thickness of the limiter 212 can be 0mm

[0067] In some embodiments, the base 211 and / or the limiting body 212 are transparent members, and the adhesive member 220 is a light-curing adhesive. In particular, the base 211 and / or the limiting body 212 are transparent plastic members, and the adhesive member 220 is a UV adhesive.​

[0068] In this way, when curing the adhesive 220 by light, the light can easily pass through the base 211 or the limiting body 212 to quickly cure the adhesive 220, thereby shortening the curing time.

[0069] Furthermore, in this embodiment, the material of the base 211 and / or the limiting body 212 is at least one of PCM, PET, PP, and PE, and / or the light-curing adhesive is UV adhesive.

[0070] Specifically, PCM primarily consists of polycarbonate blends, which offer excellent electrical properties, chemical stability, and heat resistance. PET, or polyethylene terephthalate, exhibits excellent physical and mechanical properties over a wide temperature range, including excellent electrical insulation, creep resistance, fatigue resistance, friction resistance, and dimensional stability. PP, or polypropylene, is lightweight, wear-resistant, antibacterial, and easily dyeable, and possesses excellent insulation, chemical stability, heat resistance, transparency, mechanical properties, corrosion resistance, weather resistance, and plasticity. PE, or polyethylene, offers excellent low-temperature resistance, good chemical stability, low water absorption, and excellent electrical insulation.

[0071] The base 211 and / or the limiting body 212 may be made of any one or more of the above materials, which may be determined according to actual needs and is not excessively limited in this embodiment.

[0072] In some embodiments, the battery pack 10 satisfies the following relationship:

[0073] G 胶剪切 *K cell有效 *n cell有效 *K pet *S pet有效 / η3>4800N;and 2MPa≤G 胶剪切 , 12mm≤K cell有效 , 1≤n cell有效 , 30mm≤K pet ≤60mm, 50%≤S pet有效 ≤100%, 1.0≤η3≤1.4;

[0074] Where: G 胶剪切 K is the shear strength of the adhesive 220; cell有效 is the effective bonding width of the battery 110 along the first direction; n cell有效 K is the effective number of the connecting member 210 connected to the battery 110 on one side; pet S is the width of the connecting member 210 along the second direction; pet有效 is the effective bonding percentage of the adhesive 220; η3 is the overall safety factor.

[0075] When the battery pack 10 satisfies the above relationship, the restraining tension applied by the connecting component 200 to the battery 110 can be greater than 4800N to ensure that the adhesive 220 and the battery 110 are not separated (i.e., not debonded), the restraint is firm, the reliability of the connecting component 200 is improved, and the performance of the battery pack 10 is thereby improved.

[0076] G 胶剪切 The shear strength of the adhesive 220 is generally ≥2.0 MPa. For details, please refer to the determination method in GB / T1678-2006 "Determination of shear strength of adhesives".

[0077] K cell有效 The effective bonding width of the battery 110 along the first direction is generally greater than 12 mm. It is limited by the width of the battery 110 , which is generally greater than 10 mm.

[0078] n cell有效 The effective number of the connecting members 210 connected to the batteries 110 on one side along the first direction is generally greater than or equal to 1, and can be 2, 3, 4, etc.

[0079] K pet The width of the connecting member 210 along the second direction is generally 30 mm to 60 mm. When the width is less than 30 mm, the thickness of the connecting member 210 increases, which affects the thickness of the adhesive member 220. Therefore, it should not be too narrow.

[0080] S pet有效 The effective bonding percentage of the adhesive 220 is generally 50% to 100%. The measurement method is as follows: Figure 6 As shown, “K 胶 " is the distance at the narrowest point of the glue, then S pet有效 =K 胶 / K pet .

[0081] η3 is the overall safety factor, which is used to overcome errors in the measurement process. It ranges from 1 to 1.4, and is generally 1.2.

[0082] The present invention is further described below through specific examples.

[0083] Example 1

[0084] like Figure 5 As shown, three batteries 110 are stacked along a first direction, and foam is filled between adjacent batteries 110. The three batteries 110 are connected to the connector 210 through the adhesive 220, and the three batteries 110 are fixed. A tensile force F of 4983N is applied to the connector 210 along the X-axis direction. 拉, wherein the shear strength of the adhesive 220 is 2.2 MPa, the effective bonding width of the battery 110 is 15.10 mm, the width of the connector 210 is 60 mm, and the effective bonding percentage of the adhesive 220 is 100%.

[0085] The difference between Examples 2 to 14 and Comparative Examples 1 to 13 and Example 1 is that the tension applied to the connecting member 210 and the shear strength G of the adhesive member 220 are 胶剪切 , the width K of the connecting member 210 pet , the effective bonding percentage S of the adhesive 220 pet有效 , the effective number n of the battery 110 connected to the connector 210 on one side cell有效 The conditions are different, see Table 1 for details. Except for the differences shown in Table 1, the other conditions are the same as those in Example 1.

[0086] Table 1

[0087]

[0088]

[0089] As can be seen from Table 1, the pulling force applied to the connector 210 in Examples 1-14 is greater than 4800N, and each parameter satisfies the above relationship of the battery pack 10. The adhesive 220 and the battery 110 are not separated (i.e., not debonded). In Comparative Examples 1-13, the above relationship of the battery pack 10 is not satisfied. When the pulling force applied to the connector 210 is less than 4800N, the adhesive 220 and the battery 110 are still completely separated (i.e., debonded). Therefore, the restraining pulling force applied by the connecting assembly 200 to the battery 110 that satisfies the above relationship of the battery pack 10 can be greater than 4800N, which can ensure that the adhesive 220 and the battery 110 are not separated (i.e., not debonded) and are firmly restrained.

[0090] In some embodiments, there are multiple connection assemblies 200 , and multiple connection assemblies 200 are disposed on both sides of the battery stack 100 along the third direction.

[0091] The connection components 200 are spaced apart along the second direction, and the third direction, the first direction and the second direction all intersect.

[0092] Specifically, if Figure 1 As shown, the third direction is as follows Figure 1 As shown in the Z-axis direction, two connecting assemblies 200 are respectively provided on the upper surface and the lower surface of the battery stack 100. The two connecting assemblies 200 are spaced apart along the second direction. The third direction, the second direction and the first direction are perpendicular to each other. Figure 1 Indicated in the Y-axis direction.

[0093] In this way, the restraining tension on the battery 110 is more balanced. Of course, the number of connecting components 200 can also be set to be greater, depending on actual needs, and this is not specifically limited in this embodiment.

[0094] Furthermore, in this embodiment, the plurality of connection assemblies 200 located on both sides of the battery stack 100 along the third direction are arranged to face each other.

[0095] Specifically, if Figure 1 As shown, the connection components 200 on the upper and lower surfaces of the battery stack 100 correspond to each other and are arranged opposite each other. In this way, the restraining tension on the upper and lower surfaces of the battery stack 100 is more balanced, and assembly is also facilitated.

[0096] Furthermore, in this embodiment, the battery pack 10 satisfies the following relationship:

[0097] 0≤[(1+η2)*F*S cell *(n cell -1)] / [1000*η1*n pet *K pet *H pet ]≤2mm; and G pet ≥3.59MPa, 0.3≤η2≤0.5, 0≤F≤4800N, 3mm≤S cell ≤5mm, n cell >2, 0.9≤η1≤1.1, 4≤n pet ≤8, 0.3mm≤H pet ≤2mm, 30mm<K pet ≤60mm;

[0098] Where: η2 is the expansion safety factor; F is the preset restraint force on the multiple batteries 110; S cell is the gap between adjacent batteries 110; n cell is the number of batteries 110; η1 is the safety factor of the restraint force; n pet is the number of connectors 210; H pet K is the thickness of the connecting member 210 along the third direction; pet is the width of the connecting member 210 along the second direction.

[0099] Specifically, the battery pack 10 satisfies the above relationship, and the connecting assembly 200 can provide sufficient restraint force so that the expansion amount L of the battery pack 10 is 膨胀 Can be constrained between 0 and 2 mm, L 膨胀 That is, the length change of the battery pack 10 when it expands along the first direction can ensure that it can be easily loaded into the tray 20 under the premise of being restrained, thereby meeting the assembly requirements.

[0100] Among them, η2 is the safety factor of expansion, which is generally taken as 0.3~0.5.

[0101] The preset restraining force F on the plurality of batteries 110 can be obtained by applying pressure on two sides of the battery stack 100 along the first direction and measuring the pressure required when the battery pack 10 is compressed to a target size, ie, F.

[0102] S cell is the gap between adjacent batteries 110. If the corners of the battery 110 are rounded, there is no bonding at the rounded corners. Therefore, S cell It is also the non-bonded length between adjacent batteries 110 , and is generally 3 mm to 5 mm.

[0103] n cell The total number of batteries 110 in the battery stack 100 is generally greater than 2.

[0104] η1 is the safety factor of the restraint force, which is generally taken as 1.0.

[0105] n pet The number of connectors 210 is required to be evenly distributed on the upper and lower surfaces of the battery stack 100, generally 4 to 8, usually an even number. However, too many connectors 210 will affect thermal management, so it is not advisable to have too many connectors 210.

[0106] H pet The thickness of the connecting member 210 along the third direction is generally 0.3 mm to 2 mm. If it exceeds 2 mm, the thickness of the adhesive member 220 will be too thick, affecting the bonding performance. Therefore, it should not be too thick.

[0107] K pet The width of the connecting member 210 along the second direction is generally 30 mm to 60 mm. When the width is less than 30 mm, the thickness of the connecting member 210 increases, which affects the thickness of the adhesive member 220. Therefore, it should not be too narrow.

[0108] The present invention is further described below through specific examples.

[0109] Example 1

[0110] 32 batteries 110 are stacked along a first direction, with a gap of 3.8 mm between adjacent batteries 110, and foam is filled between adjacent batteries 110 to form a battery stack 100. The batteries 110 can be connected in series, and a press can be used to squeeze the battery stack 100 on both sides along the first direction, such as Figure 4As shown, a pressure of 1000N is applied to the battery 110, that is, a preset restraining force of 1000N. At this time, two connecting assemblies 200 are set on both the upper and lower sides of the battery stack 100 along the third direction, and the two connecting assemblies 200 are arranged at intervals along the second direction, and the connecting assemblies 200 in the third direction are arranged opposite to each other. The initial length of the battery stack 100 is recorded, and then the squeezing force of the press on both sides of the battery stack 100 is removed, and then the final length of the battery stack 100 is recorded. Then, L 膨胀 = Final length minus initial length. Finally, place the tray 20 upside down on the battery pack 10 to check for interference. The connector 210 has a length of 623.10 mm, a width of 40 mm, a thickness of 0.6 mm, and an elastic modulus of 3.59 MPa. Furthermore, the safety factor η1 for the restraining tension is 1.00, the safety factor η2 for the expansion is 0.40, and the length of the tray 20 cavity along the first direction is 2 mm greater than the initial length of the battery stack 100, resulting in a 1 mm single-side gap.

[0111] Measure the expansion amount L of the battery pack 10 膨胀 The measurement method can be to take point measurements in a three-coordinate manner. Generally, one point is selected from each of the four corners of the battery pack 10, and more than three points are equally divided in the middle position, so as to obtain the length change of the battery pack 10 along the first direction, which is the expansion amount L. 膨胀 It is 0.402mm.

[0112] It should be noted that if Figure 4 As shown, the measurement method of the preset restraint force can refer to the maximum force value recorded during the compression process in GB / T8813-2020. The specific operation can be to use push rods to push the battery stack 100 horizontally on both sides of the battery stack 100 along the first direction to push the battery module from the initial position P0 to the target position P t The maximum required pressure is recorded as the preset restraining force. Furthermore, when measuring the repaired battery stack 100, the connectors 210 and adhesives 220 on the surface can be removed, allowing the battery stack 100 to freely expand in the first direction. The preset restraining force can then be measured using the above method.

[0113] The difference between Examples 2 to 20 and Comparative Examples 1 to 17 and Example 1 is that the preset restraining force F on the battery stack 100 and the thickness H of the connector 210 along the third direction are pet , the width K of the connecting member 210 along the second direction pet , the number n of the connecting members 210 pet , the elastic modulus of the connecting member 210, the safety factor η2 of the expansion amount and other conditions are different, see Table 2 for details. Except for the differences shown in Table 2, the other conditions are the same as those in Example 1.

[0114] Table 2

[0115]

[0116]

[0117] As can be seen from Table 2, the expansion of the battery pack 10 in Examples 1 to 20 is within 2 mm. When the tray 20 is installed upside down, the battery pack 10 can be loaded normally without interference. However, in Comparative Examples 1 to 17, when the restraining force F is above 4800 N, or the thickness H of the connector 210 is pet When the width K of the connecting member 210 along the second direction is less than 0.3 mm, pet ≤30mm, or the number of connectors 210 n pet When the elastic modulus G of the connector 210 is less than 4, pet When the battery pack 10 is smaller than 3.59mm, the expansion of the battery pack 10 exceeds 2mm. When the tray 20 is installed upside down, interference occurs between the battery pack 10 and the tray 20, making it impossible to install the battery pack 10 properly. Therefore, the battery pack 10 needs to meet the above relationship and control various parameters. The connection component 200 can provide sufficient restraint force to make the expansion of the battery pack 10 L 膨胀 It can be constrained between 0 and 2 mm, ensuring that it can be easily loaded into the tray 20 under the premise of being restrained, thereby meeting the assembly requirements.

[0118] In some embodiments, the battery pack 10 provided in the embodiments of the present application further includes a plurality of buffer members 300 , and the buffer members 300 are filled between adjacent batteries 110 .

[0119] Specifically, if Figure 1 As shown, the buffer 300 is used to absorb the expansion of the battery 110 , and can be foam, aerogel, etc., and has a generally sheet-like structure to be filled between adjacent batteries 110 .

[0120] The specific material, size, etc. of the buffer component 300 can be determined according to actual needs and are not specifically limited in this embodiment.

[0121] Furthermore, the battery pack 10 provided in the embodiment of the present application further includes at least one side plate 400 . Along the first direction, the side plate 400 is located on one side of the battery stack 100 , and a heat insulating member 500 is filled between the side plate 400 and the adjacent battery 110 .

[0122] For example, Figure 1As shown, there are two side panels 400, one on each side of the battery stack 100 in the first direction, and they also provide restraining and stopping force for the battery 110. Furthermore, a thermal insulator 500, such as aerogel, is placed between the side panels 400 and adjacent batteries 110 to isolate heat transfer between the battery 110 and the outside world, facilitating accurate thermal management of the battery 110.

[0123] In a second aspect, an embodiment of the present application further provides a battery pack, comprising a tray 20 and a battery pack 10 provided in any of the above embodiments, wherein the battery pack is disposed in the tray 20. The tray 20 may be a tray, and the battery pack 10 is placed in the tray 20.

[0124] Specifically, if Figure 7 As shown, the battery pack 10 can be placed on a cold plate and encapsulated into a battery pack 30 by a tray 20 and a cover. Of course, components such as a distribution box and cooling pipes can also be installed in the battery pack 30.

[0125] The structure of the battery pack 10 has been described in detail in the above embodiments and will not be described again here.

[0126] The battery pack provided in the embodiment of the present application is configured with a battery pack 10, which includes a battery stack 100 and at least one connecting component 200. The battery stack 100 includes a plurality of batteries 110 stacked along a first direction. The connecting component 200 includes a connecting member 210 and an adhesive member 220. The connecting member 210 is arranged to extend along the first direction, and a connecting groove 201 is provided on the connecting member 210 on a side facing the battery stack 100. The adhesive member 220 is arranged in the connecting groove 201 to limit the bonding position. At least the batteries 110 located at both ends of the battery stack 100 in the first direction are connected to the connecting member 210 through the adhesive member 220, providing a restraining tension to the batteries 110. That is, by providing a restraining tension to the batteries 110 through the connecting component 200, the difference can be greatly reduced, and the battery 110 can be stabilized and controlled, thereby ensuring that the battery 110 performs better and improves the cycle life.

[0127] In a third aspect, an embodiment of the present application further provides an electric device, including the battery pack 30 or battery group 10 provided in any of the above embodiments. The electric device may be a new energy vehicle, an energy storage power station, or the like.

[0128] The electrical equipment provided in the embodiment of the present application is configured with the above-mentioned battery pack 10, which includes a battery stack 100 and at least one connecting component 200. The battery stack 100 includes a plurality of batteries 110 stacked along a first direction. The connecting component 200 includes a connecting member 210 and an adhesive member 220. The connecting member 210 is arranged to extend along the first direction, and a connecting groove 201 is provided on the connecting member 210 on a side facing the battery stack 100. The adhesive member 220 is arranged in the connecting groove 201 to limit the bonding position. At least the batteries 110 located at both ends of the battery stack 100 in the first direction are connected to the connecting member 210 through the adhesive member 220, providing a restraining tension to the batteries 110. That is, by providing a restraining tension to the batteries 110 through the connecting component 200, the difference can be greatly reduced, and the battery 110 can be stabilized and controlled, thereby ensuring that the battery 110 performs better and improves the cycle life.

[0129] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present application are indicated by the claims.

[0130] It should be understood that the present application is not limited to the precise structure described above and shown in the appended drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A battery pack, characterized in that: The invention comprises a battery stack (100) and at least one connection assembly (200), wherein the battery stack (100) comprises a plurality of batteries (110) stacked in a first direction; The connecting assembly (200) comprises a connecting member (210) and an adhesive member (220), the connecting member (210) extending along the first direction, and a connecting groove (201) being provided on a side of the connecting member (210) facing the battery stack (100); The adhesive member (220) is located in the connection groove (201), and at least the batteries (110) located at both ends of the battery stack (100) in the first direction are connected to the connection member (210) through the adhesive member (220).

2. The battery pack according to claim 1, wherein: The connecting member (210) comprises a base (211) and two limiters (212) connected to the base (211), and the base (211) extends along the first direction; The two limiting bodies (212) are located on a side of the base (211) facing the battery stack (100) and are spaced apart along a second direction to form the connecting groove (201) with the base (211), wherein the second direction intersects with the first direction.

3. The battery pack according to claim 2, wherein: The base (211) and / or the limiting body (212) are transparent parts, and the adhesive part (220) is a light-curing adhesive.

4. The battery pack according to claim 3, wherein: The material of the base (211) and / or the limiting body (212) is at least one of PCM, PET, PP, and PE; and / or the light-curing adhesive is UV adhesive.

5. The battery pack according to claim 1, wherein: There are multiple connection assemblies (200), and multiple connection assemblies (200) are provided on both sides of the battery stack (100) along the third direction; The connection components (200) are spaced apart along the second direction, and the third direction, the first direction and the second direction all intersect.

6. The battery pack according to claim 5, wherein: The plurality of connection assemblies (200) located on both sides of the battery stack (100) along the third direction are arranged to face each other.

7. The battery pack according to claim 1, wherein: The battery pack (10) satisfies the following relationship: G 胶剪切 *K cell有效 *n cell有效 *K pet *S pet有效 / η3>4800N;and 2MPa≤G 胶剪切 , 12mm≤K cell有效 , 1≤n cell有效 , 30mm≤K pet ≤60mm, 50%≤S pet有效 ≤100%, 1.0≤η3≤1.4; Where: G 胶剪切 K is the shear strength of the adhesive (220); cell有效 is the effective bonding width of the battery (110) along the first direction; n cell有效 K is the effective number of the connecting member (210) connected to the battery (110) on one side; pet S is the width of the connecting member (210) along the second direction; pet有效 is the effective bonding percentage of the bonding member (220); and η3 is the overall safety factor.

8. The battery pack according to claim 5, wherein: The battery pack (10) satisfies the following relationship: 0≤[(1+η2)*F*S cell *(n cell -1)] / [1000*η1*n pet *K pet *H pet ]≤2mm; and G pet ≥3.59MPa, 0.3≤η2≤0.5, 0≤F≤4800N, 3mm≤S cell ≤5mm, n cell >2, 0.9≤η1≤1.1, 4≤n pet ≤8, 0.3mm≤H pet ≤2mm, 30mm<K pet ≤60mm; Where: G pet is the elastic modulus of the connector (210); η2 is the expansion safety factor; F is the preset restraining force for the plurality of batteries (110); S cell is the gap between adjacent batteries (110); n cell is the number of the batteries (110); η1 is the restraint safety factor; n pet is the number of the connecting members (210); H pet K is the thickness of the connecting member (210) along the third direction; pet is the width of the connecting member (210) along the second direction.

9. The battery pack according to any one of claims 1 to 8, characterized in that: It also includes a plurality of buffer members (300), wherein the buffer members (300) are filled between adjacent batteries (110).

10. The battery pack according to any one of claims 1 to 8, characterized in that: The invention also includes at least one side plate (400), wherein the side plate (400) is located on one side of the battery stack (100) along the first direction, and a heat insulating member (500) is filled between the side plate (400) and the adjacent battery (110).

11. A battery pack, characterized in that: The invention comprises a tray (20) and a battery pack (10) according to at least one of claims 1 to 10, wherein the battery pack (10) is arranged in the tray (20).

12. An electrical device, characterized in that: Comprising the battery pack (30) according to claim 11 or the battery pack (10) according to at least one of claims 1 to 10.

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