Battery, electric equipment and battery assembly method

Abstract

The invention relates to the technical field of batteries, and particularly provides a battery, electric equipment and a battery assembly method. The battery comprises a battery cell and a connecting piece. The plurality of single batteries are arranged along a first direction, and in the first direction, each single battery comprises two end walls which have opposite polarities and are oppositely arranged; and in the first direction, the connecting piece is positioned between two adjacent battery monomers. The connecting piece comprises a first shell and a cavity located in the first shell, and the first shell is configured to deform when the cavity is filled with a medium; the first shell abuts against the two end walls, opposite in polarity, of the adjacent single batteries, and the adjacent single batteries are electrically connected with the first shell through the end walls. The problem of overcurrent caused by using a rigid connection structure and hard contact during grouping of non-polar column battery monomers is solved, good overcurrent capacity is provided through the deformable connecting piece filled with the medium, special working conditions such as vibration can be resisted, and damage to mechanical components caused by stress superposition is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of batteries, in particular to batteries, electrical equipment and battery assembly methods. Background Art

[0002] Existing battery cells are provided with raised poles, and a bus is provided when grouped, and the bus contacts the poles of each battery cell, thereby realizing electrical connection between each battery cell. On the one hand, the raised poles will occupy the space in the battery, reducing the space utilization rate; on the other hand, the pole size directly limits the size of the electrical connection area, making the impedance of the existing electrical connection higher.

[0003] The pole-less battery has a positive cover plate and a negative cover plate at both ends of the shell to replace the pole. Electrical connection can be achieved by embedding adjacent battery cell covers, or by setting a busbar to achieve electrical connection.

[0004] Although the poleless battery can solve the problem of pole space occupation and improve space utilization, the battery will produce gas during the cycle, causing the battery cell to expand and squeeze the shell. The shell deformation, as well as vibration and bumpy working conditions will affect the reliability of the electrical connection between poleless batteries. The quality of welding with the busbar is also easily affected by the deformation of the battery shell, and in severe cases, cracks will appear and leakage will occur. Summary of the invention

[0005] The battery, electrical equipment and battery assembly method provided by the embodiments of the present invention at least solve the electrical connection problem when the poleless batteries are grouped, have high reliability and extend the battery life.

[0006] In a first aspect, the present invention provides a battery, including: a battery cell and a connector; The plurality of battery cells are arranged along a first direction. In the first direction, the battery cells include two end walls with opposite polarities and arranged opposite to each other. In the first direction, the connecting member is located between two adjacent battery cells. The connector includes a first shell and a chamber located inside the first shell, wherein the first shell is configured to deform when the chamber is filled with a medium; the first shell respectively abuts against two end walls of adjacent battery cells with opposite polarities, and the adjacent battery cells are electrically connected to the first shell through the end walls.

[0007] In the battery provided by the embodiment of the invention, a conductive member is disposed in the chamber, and the conductive member at least connects the area where the first shell abuts against the two end walls.

[0008] In the battery provided by the embodiment of the invention, the conductive member comprises a plurality of mutually independent conductive sheets, and the two ends of the conductive sheets are respectively connected to the areas where the first shell abuts against the two end walls; Alternatively, the conductive member is configured as a honeycomb structure, and the honeycomb structure is connected to an inner wall of the first shell.

[0009] In the battery provided by the embodiment of the present invention, the thickness of the conductive sheet is greater than or equal to 30 μm and less than or equal to 50 μm.

[0010] In the battery provided by the embodiment of the invention, the conductive member divides the chamber into a plurality of chamber monomers; The chamber monomer is used to contain the filled medium; Alternatively, a closed medium tube is provided in the chamber monomer, the medium tube is insulated from the conductive member, and the medium tube is used to contain the filled medium.

[0011] In the battery provided by the embodiment of the present invention, the material of the first shell is set to be a conductive metal; an injection hole and a seal are provided on the first shell, the injection hole is connected to the chamber, and the seal is used to seal the injection hole.

[0012] The battery provided by the embodiment of the invention further comprises a first connecting pipe, the first connecting pipe having a plurality of first connecting pipes, and the first connecting pipe is used to connect the chambers of the adjacent connecting members; Alternatively, the battery further comprises a second connecting pipe, the second connecting pipe comprises a main path and a branch path, both ends of the main path are connected to the medium supply device, and the branch path connects the corresponding chamber of the connecting member and the main path.

[0013] In the battery provided by the embodiment of the present invention, the medium is configured as a cooling liquid or a cooling gas.

[0014] In a second aspect, the present invention provides an electrical device according to an embodiment of the present invention, wherein the electrical device comprises a battery as described in any of the above embodiments.

[0015] In a third aspect, the present invention provides a battery assembly method, comprising: Arrange a plurality of battery cells in sequence along a first direction, and form a plug-in gap between adjacent battery cells; wherein end walls with opposite polarities are provided at both ends of the battery cells along the first direction, and the end walls on both sides of the plug-in gap have opposite polarities; The connecting piece which is not filled with a medium is arranged correspondingly in the plug-in gap; The medium is filled into the cavity of the connecting member until the connecting member is deformed and abuts against the end walls on both sides of the insertion gap.

[0016] The battery, electrical equipment and battery assembly method provided by the invention solve the overcurrent problem caused by the rigid connection structure and hard contact when the poleless battery cells are grouped. The deformable connector filled with medium is squeezed between the two end walls, and the contact surface is large and tightly fitted, providing better overcurrent capacity and reliability. It can resist special working conditions such as vibration and avoid damage to mechanical components caused by stress superposition. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 It is a schematic diagram of the structure of the battery cell in the first embodiment of the present invention.

[0018] Figure 2 It is a schematic diagram of the structure of the battery in Example 1 created by the present invention.

[0019] Figure 3 It is a schematic diagram of the connection relationship of the connecting parts in the first embodiment of the present invention.

[0020] Figure 4 It is another schematic diagram of the connection relationship of the connecting parts in the first embodiment of the present invention.

[0021] Figure 5 It is a schematic diagram of the structure of the connecting piece in the first embodiment of the present invention.

[0022] Figure 6 It is a schematic diagram of the structure of the connecting piece in the second embodiment of the present invention.

[0023] Figure 7 yes Figure 6 The schematic diagram of the structure of the connecting piece shown is provided with a medium pipe but is not filled with a medium.

[0024] Figure 8 yes Figure 6 The schematic diagram of the structure of the connecting piece shown is provided with a medium pipe and filled with medium.

[0025] Fig. 9 It is a schematic diagram of the structure of the connecting piece in the third embodiment of the present invention.

[0026] Fig.10 yes Fig. 9 The schematic diagram of the structure of the connecting piece shown is provided with a medium pipe and filled with medium.

[0027] Fig.11 It is a flow chart of a battery assembly method according to an embodiment of the present invention.

[0028] The above drawings include the following reference numerals: 1—battery cell; 11—end wall; 12—battery core; 1201—end face; 1202—first side face; 1203—second side face; 2—connector; 3—first shell; 31—injection hole; 32—seal; 4—chamber; 41—chamber cell; 51—conductive sheet; 52—honeycomb structure; 6—medium tube; 7—first connecting tube; 8—second connecting tube; 81—main path; 82—branch path. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings. Embodiment 1

[0032] In the design of a battery with a pole, the pole protrudes from the top or bottom of the battery. The existence of the pole will occupy a certain space in the height direction. Such a protruding structure will increase the size of the battery in the height direction. In some application scenarios that have strict requirements on the size of the device, such as ultra-thin electronic products, new energy vehicle batteries with a relatively compact space layout, etc., the space occupied by the pole in the height direction is likely to limit the device design and performance improvement. In addition, the small size of the pole directly limits the area of ​​the electrical connection area, which will also make the battery impedance higher and cause severe heating.

[0033] The pole-less battery eliminates the protruding pole by connecting the electrode directly to the battery casing or other connecting parts. Under the same volume, the pole-less battery can accommodate more active materials and has a higher energy density. At the same time, the pole-less battery reduces the connection between the original pole and the electrode, and has a lower internal resistance than the pole-containing battery.

[0034] When performing modular integration, the poleless battery cells 1 can be directly stacked, and the adjacent cover plates of the adjacent battery cells 1 can be embedded to achieve electrical connection; or a hard adapter can be used to weld the cover plate, and then a busbar can be set to connect the adapter plate. However, both the cover plate embedding and the adapter plate welding belong to hard contact methods, and the connection structure is relatively rigid. The rigid connection structure has low reliability under vibration and bumpy conditions, and is prone to breakage and leakage. In addition, the above connection structure also has problems such as the deformation of the battery cell squeezing the cover plate and the large impedance at the welding point.

[0035] Accordingly, the first embodiment of the present invention provides a battery, including a battery cell 1 with a pole-less design and a connector 2. The connector 2 can realize electrical connection between the battery cells 1 without poles, solving the problem of pole space occupation of the poles of the battery with poles; the connector 2 can also overcome the problem of low reliability caused by the rigid connection structure, providing a reliable electrical connection method for the grouping of the battery cells 1 without poles.

[0036] Specifically, refer to Figure 2 As shown, there are a plurality of battery cells 1, and the plurality of battery cells 1 are arranged along a first direction. In the first direction, each battery cell 1 has two end walls 11 with opposite polarities and arranged opposite to each other.

[0037] In some embodiments, the battery cell 1 includes a shell body, a battery cell 12 and an electrode cover plate. The shell body is through-set and has openings at both ends. There are two electrode cover plates, which are respectively used to close the two openings of the shell body, and the electrode cover plates at the two ends have opposite polarities. An insulating member is provided between the electrode cover plate and the shell body, and the insulating member is fixed to the shell body by a rolling groove process. The shell body and the electrode cover plate form a closed space for accommodating the battery cell 12; the electrode cover plate is connected to the electrode corresponding to the battery cell 12. In this battery cell 1, the end wall 11 of the battery cell 1 is two electrode cover plates with opposite polarities, and the first direction is the direction in which the shell body passes through.

[0038] In other embodiments, the battery cell 1 includes a shell body, a battery cell 12 and an electrode cover plate. The shell body may be closed at one end along the first direction and open at the other end. In this case, the closed end of the shell body is set as the bottom wall of the shell, and the open end of the shell body is located at the top of the shell. The electrode cover plate has an opening for closing the shell body. The electrode cover plate and the shell body together form a closed space for accommodating the battery cell 12. In this embodiment, the battery cell 1 has two end walls 11, one of which is set as the closed end of the shell body, that is, the bottom wall of the shell; the other end wall 11 is set as the electrode cover plate for closing the shell body. The bottom wall of the shell is insulated from the side wall of the shell body, and the electrode cover plate is insulated from the shell body. The polarity of the bottom wall of the shell and the electrode cover plate are opposite, and they are arranged opposite to each other along the first direction.

[0039] Further, refer to Figure 1 As shown, the battery cell 12 includes two oppositely disposed end faces 1201, and a side surface connecting the two end faces 1201. The side surfaces of the battery cell 12 include a pair of first side surfaces 1202 disposed in parallel and oppositely and having a larger area, and a pair of second side surfaces 1203 disposed in parallel and oppositely and having a smaller area. The first side surface 1202 has a larger area, and the second side surface 1203 has a smaller area, relative to the area of ​​the other pair of side surfaces. That is, the area of ​​the first side surface 1202 is greater than the area of ​​the second side surface 1203.

[0040] Preferably, a pair of first side surfaces 1202 with larger areas in the side surfaces of the battery cell 12 are respectively arranged opposite to the two end walls 11 of the battery cell 1. The direction in which the two end walls 11 are arranged opposite to each other is the thickness direction of the battery cell 12; when the two end walls 11 are opposite to each other along the first direction, the multiple battery cells 1 are arranged along the first direction, and at this time, the first direction is also the thickness direction of the battery cell 12. In this way of stacking along the thickness direction of the battery cell 1, the electrical connection area of ​​two adjacent battery cells is larger, and the overall size of the obtained battery can be made more reasonable, the size in all directions is more balanced, the number of battery cells arranged inside the battery is as large as possible, and the space utilization rate inside the battery is higher. The obtained battery is more suitable for the design and use of new energy products.

[0041] Specifically, in the first direction, the connector 2 is located between two adjacent battery cells 1. The end walls 11 of the two adjacent battery cells 1 are opposite in polarity and form a plug-in gap in the first direction. The connector 2 is located in the plug-in gap, abuts against the end walls 11 on both sides of the gap, and then abuts against the two adjacent battery cells 1, electrically connecting the two adjacent battery cells 1.

[0042] Furthermore, the connector 2 includes a first shell 3 and a chamber 4 located inside the first shell 3. The first shell 3 abuts against two end walls 11 of opposite polarities of adjacent battery cells 1, and the adjacent battery cells 1 are electrically connected to the first shell 3 through the end walls 11. Unlike a hard adapter, the first shell 3 is configured to deform when the internal chamber 4 is filled with a medium, and the boundary contour of the medium in the chamber 4 determines the deformation degree of the first shell 3 and the specific shape after deformation.

[0043] Next, the medium that can be filled into the chamber 4 is set to be a fluid, specifically including gas and liquid. Compared with solid media, fluids can flow and can be filled into or taken out of the chamber 4, which facilitates the control of the amount of medium filled into the chamber 4. The fluid can be continuously deformed by any small shear force, and after being filled into the chamber 4, the shape of the first shell 3 can fit the contour of the insertion gap of the adjacent battery cell 1. The surface shape of the first shell 3 is determined by the type and amount of the medium filled into the chamber 4. Different types of media correspond to different weights, densities and flow rates, and the shape of the first shell 3 is changed in combination with different filling amounts.

[0044] Preferably, the above-mentioned medium should have good electrical insulation, and even if it leaks during charging or use, it can avoid short circuit inside the battery. At the same time, the medium is preferably set to a coolant or a cooling gas. For example, silicone oil, mineral oil, nitrogen, etc. The electrical connection positions of adjacent battery cells 1 are not smooth at the microscopic level due to the presence of tiny protrusions and depressions on the contact surface. When the current passes through, the flow at the contact point is hindered to generate contact resistance, and a large amount of heat is generated according to Joule's law. Therefore, the heat generation is usually large at the electrical connection. When the chamber 4 is filled with low-temperature coolant or cooling gas, the heat can be absorbed by the first shell 3 for heat dissipation. The overall heat generation of the battery can be controlled without the need for an additional heat dissipation device, thereby simplifying the battery structure and improving the safety performance and service life of the battery.

[0045] Specifically, the material of the first shell 3 is set to be a conductive metal, and the first shell 3 is in the shape of a metal bag, which is used to achieve electrical connection between adjacent battery cells 1 after deformation. In some embodiments, the material of the first shell 3 can be set to aluminum, copper, steel, or an alloy of aluminum, copper, and steel; in other embodiments, it can also be set to other metals that meet the requirements of conductivity and deformation, or set to a metal plated part with a metal fracture toughness not lower than that of aluminum, copper, steel, and their alloys.

[0046] Compared with hard metal sheets and rigid connection structures, the deformable first shell 3 in this embodiment is more fully in contact with the end wall 11, with better fitting effect, better electrical connection effect and better current carrying capacity. The connector 2 in this embodiment has the characteristics of being soft and easy to bend, and can change or restore its appearance according to the medium filling situation, is not easy to break, forms a flexible filling for the plug-in gap of adjacent battery cells 1, and has elasticity after being filled with the medium. On the one hand, it can resist working conditions such as bumps and vibrations, and always maintain the electrical connection relationship between adjacent battery cells 1. On the other hand, while meeting the electrical connection requirements, there is no need for welding, thereby reducing the cost of the welding process, avoiding the influence of welding slag and weld marks on the battery quality, and overcoming the problem of fracture caused by insufficient welding quality under extreme working conditions.

[0047] The area of ​​the connector 2 for contacting the end wall 11 after deformation is preferably set to be consistent with the area of ​​the end wall 11. The area of ​​the connector 2 determines the flow area between the two battery cells 1. When the area of ​​the connector 2 is smaller, the impedance is larger. When the area of ​​the connector 2 is larger, the flow area is significantly increased compared to the battery with a pole, and the advantages of the battery without a pole can be fully utilized.

[0048] Specifically, refer to Figure 5 As shown, the first housing 3 is provided with an injection hole 31 and a sealing member 32. The injection hole 31 is provided as a through hole and communicates with the interior of the chamber 4, and the medium can be filled into the chamber 4 through the injection hole 31. The sealing member 32 is used to seal the injection hole 31. In some embodiments, the sealing member 32 is provided as a sealing pin, which is inserted into the injection hole 31 after the medium injection is completed. In other embodiments, the first housing 3 can also be provided with other sealing methods such as a gasket seal.

[0049] Further, in some implementations of the first embodiment of the present invention, the provided battery further includes a first connecting tube 7, the first connecting tube 7 has a plurality of first connecting tubes 7, and the first connecting tube 7 is used to connect the chambers 4 of the adjacent connecting members 2. The first connecting tube 7 can connect the injection holes 31 of the adjacent connecting members 2. In addition, referring to Figure 3 As shown, each chamber 4 may be provided with an inlet and an outlet, and the first connecting pipe 7 connects the connectors 2 end to end in sequence, without sealing the inlet and outlet of each connector 2. When injecting the medium, one of the connectors 2 is injected, and the medium flows from the first connecting pipe 7 to the chambers 4 of the other connectors 2.

[0050] Further, refer to Figure 4As shown, in some other implementations of the first embodiment of the present invention, the provided battery further includes a second connecting pipe 8. The second connecting pipe 8 includes a main path 81 and a branch path 82, both ends of the main path 81 are connected to the medium supply device, and the branch path 82 connects the corresponding chamber 4 of the connector 2 and the main path 81. When injecting the medium, the supply device is connected through the main path 81, and the medium is divided from the main path 81 to each branch path 82, and then injected into the chamber 4 of different connectors 2 by each branch path 82.

[0051] The first connecting tube 7 and the second connecting tube 8 can complete the medium injection without changing the injection position multiple times, and the operation is simple. There is no need to consider the opening and closing and sealing effect of the injection hole 31 of each connector 2, and the processing difficulty is relatively low. The second connecting tube 8 is more efficient and more uniform when injecting the medium, and the first connecting tube 7 has less consumables, lower costs, and less medium loss and residue when injecting the medium. After the first connecting tube 7 and the second connecting tube 8 are connected to each other, the flow path of the medium can also be extended. When the medium can flow, the heat dissipation effect of the electrical connection position is better.

[0052] The battery provided in the first embodiment of the present invention solves the overcurrent problem caused by the rigid connection structure and hard contact of the polar column-free battery cell by setting a deformable connector 2, and has good overcurrent capacity. It is easy to use, has a good electrical connection effect, and can resist special working conditions such as vibration. By injecting a medium, the heat generation at the electrical connection can also be alleviated, providing a more reliable solution for the connection and grouping of polar column-free batteries. Embodiment 2

[0053] A second embodiment of the present invention provides a battery. The difference between the battery provided in the second embodiment and the battery provided in the first embodiment is that a conductive member is further provided in the chamber 4 , and the conductive member at least connects the area where the first shell 3 abuts against the two end walls 11 .

[0054] In the first embodiment of the present invention, the electrical connection between adjacent battery cells 1 is completed only by the first shell 3. Since the first shell 3 needs to deform as the medium is filled, the material and wall thickness of the first shell 3 are limited. Providing a conductive member in the chamber 4 can enhance the current capacity, reduce the internal resistance, and achieve a better electrical connection effect.

[0055] Specifically, the conductive member includes a plurality of conductive sheets 51. The two ends of each conductive sheet 51 are respectively connected to the areas where the first shell 3 abuts against the two end walls 11. When adjacent battery cells 1 are electrically connected, the current can flow from one end wall 11 to the other end wall 11 via the first shell 3, or flow to the conductive sheet 51 via the contact position between the first shell 3 and the conductive sheet 51, and flow to the other end wall 11 through the other end of the conductive sheet 51. The provision of the conductive sheet 51 can increase the total contact area of ​​the metal connection part through which the current flows, provide multiple paths for the current, can withstand a larger current without being limited by overheating damage, and has a stronger current capacity.

[0056] After the medium is filled into the chamber 4, the first shell 3 is deformed and expanded along the first direction, and the spacing along the first direction of the area of ​​the first shell 3 used to abut the two end walls 11 gradually increases. In the second embodiment of the present invention, when the chamber 4 of the first shell 3 is filled with the medium, the first shell 3 expands to the maximum deformation degree, at which time the conductive sheet 51 is straightened and tightened with the deformation of the first shell 3, and then the circuit is connected so that two adjacent battery cells 1 are connected in series.

[0057] Furthermore, the conductive sheets 51 are arranged to be independent of each other and not in contact with each other. Figure 6 As shown, at least two conductive sheets 51 are preferably arranged to extend along the first direction after being tightened. At this time, the flow path of the current through the conductive sheet 51 to achieve electrical connection is the shortest, and accordingly, the smaller the resistance generated by the conductive sheet 51, the less heat is generated when the current flows through, the smaller the energy loss, and the stronger the current carrying capacity. When the conductive sheet 51 is long, even if the first shell 3 expands to the maximum, the conductive sheet 51 cannot be completely straightened, and the impedance generated when the current flows through is large. When the conductive sheet 51 is short, as the first shell 3 expands, the conductive sheet 51 is tightened and is very easy to break and fail.

[0058] Furthermore, the material of the conductive sheet 51 is the same as that of the first shell 3. Due to the consistent physical and chemical properties and conductivity, the resistance at the connection between the conductive sheet 51 and the first shell 3 is relatively uniform, and no additional contact resistance is generated. Compared with the case where the conductive sheet 51 and the first shell 3 are made of different materials, it is less likely to cause problems such as electrochemical corrosion, loose connection, and insufficient current capacity.

[0059] Preferably, the thickness of the conductive sheet 51 is greater than or equal to 30 μm and less than or equal to 50 μm. When the conductive sheet 51 is too thin, the cross-sectional area is reduced and the resistance is relatively high. The durability and mechanical properties are insufficient, and fatigue fracture is easy even when the length meets the requirements. When the conductive sheet 51 is too thick, the amount of metal material used increases, the processing is more difficult and it is not easy to bend. Before the medium is filled, the conductive sheet 51 may be supported in the first shell 3, affecting the shape of the connector 2 and the degree of deformation that the connector 2 can provide.

[0060] Specifically, in some implementations of the second embodiment of the present invention, in addition to connecting the area where the first shell 3 abuts the end wall 11, the conductive sheet 51 can also connect other areas of the first shell 3, so that the conductive sheet 51 separates the chamber 4 in the first shell 3 into independent chamber monomers 41. Each chamber monomer 41 is used to accommodate the filled medium. When the chamber monomers 41 are not connected to each other, multiple injection holes 31 and sealing members 32 can be provided in the first shell 3 for filling the medium; when the chamber monomers 41 are connected, one injection hole 31 can also be provided to fill the medium, and then the medium flows to each chamber monomer 41.

[0061] Further, refer to Figure 7 and Figure 8 As shown, in some implementations of the second embodiment of the present invention, a closed medium tube 6 can be provided on the basis of the separated chamber monomers 41, and the medium tube 6 is used to inject and contain the medium. In each chamber monomer 41, one or more medium tubes 6 can be provided.

[0062] When a medium tube 6 is provided in each chamber monomer 41, the medium tube 6 is provided as a soft medium tube, and the material of the medium tube can be provided as natural rubber, synthetic rubber or flexible resin, etc. When the medium is not filled, the soft medium tube is placed in the chamber monomer 41 in a sheet shape, which does not affect the overall volume of the connector 2. After the medium is filled, the soft medium tube is propped up in a round tube shape, and at the same time supports the deformation of the first shell 3.

[0063] When multiple medium tubes 6 are arranged in each chamber monomer 41, the medium tubes 6 can be set as soft medium tubes or hard medium tubes, such as epoxy resin, polyvinyl chloride, etc. The shape of the first shell 3 is changed by stacking hard medium tubes with smaller radius.

[0064] The battery provided in the second embodiment increases the conductive member and sets the conductive member as a conductive sheet 51. The connector 2 can change or restore its shape according to the medium filling condition, is not easy to break, and forms a flexible filling for the insertion gap of the adjacent battery cells 1, thereby improving the current carrying capacity and electrical connection effect of the connector 2. The medium tube 6 is provided to accommodate the medium, thereby extending the service life of the connector 2 and increasing the practicality of the connector 2. Embodiment 3

[0065] The third embodiment provides a battery, and the battery provided in the third embodiment is different from that in the first embodiment in that a conductive member is provided in the chamber 4. The third embodiment is different from the second embodiment in that the conductive member has a different structure.

[0066] Reference Fig. 9 and Fig.10As shown, compared with the conductive sheet 51 , in the third embodiment, the conductive member is configured as a honeycomb structure 52 , specifically a honeycomb metal mesh. The honeycomb structure 52 is connected to the inner wall of the first shell 3 .

[0067] Accordingly, when adjacent battery cells 1 are electrically connected, the current can flow from one end wall 11 to the other end wall 11 via the first shell 3, or flow to the conductive member via the contact position between the first shell 3 and the honeycomb structure 52, and then flow to the other end wall 11. The provision of the conductive member can increase the total contact area of ​​the metal connection part through which the current flows, and the current carrying capacity is stronger.

[0068] Compared with the conductive sheet 51, the honeycomb structure 52 provides a larger contact area for current to flow through and has a smaller contact resistance. In addition, due to the symmetry and flowability of the honeycomb structure 52, there is less local current concentration when current passes through, and the current distribution is more uniform.

[0069] After the medium is filled into the chamber 4, the first shell 3 is deformed and expanded along the first direction, and the spacing of the area of ​​the first shell 3 used to abut the two end walls 11 along the first direction gradually increases. The conductive parts of the honeycomb structure 52 are deformed as the first shell 3 expands, and the gap between the internal honeycomb units becomes larger. Compared with the conductive sheet 51, the conductive parts of the honeycomb structure 52 have better mechanical strength and stability, can withstand a wider range of external forces, are not easy to deform or loosen under vibration, impact and other environments, and have no risk of large-scale fracture. They can better adapt to extreme working conditions and have stronger buffering capacity.

[0070] The honeycomb conductive member divides the chamber 4 in the first shell 3 into a plurality of chamber monomers 41 through the honeycomb structure, each honeycomb unit is a chamber monomer 41, and each chamber monomer 41 is used to accommodate the filled medium. A closed medium pipe 6 can also be provided on the basis of the separated chamber monomers 41, and the medium pipe 6 is used to inject and accommodate the medium. In each chamber monomer 41, one or more medium pipes 6 can be provided.

[0071] The battery provided by the third embodiment of the present invention is different from the second embodiment only in the structure of the conductive member. The structure and technical effect of the chamber monomer 41 and the medium tube 6 are consistent and will not be repeated here. The third embodiment of the present invention adds a conductive member and sets the conductive member as a honeycomb structure 52. On the basis of forming a flexible filling of the plug-in gap between adjacent battery cells 1, the current carrying capacity and electrical connection effect of the connector 2 are improved, as well as the buffering capacity under vibration conditions, so that the battery can be used in electrical equipment with complex working conditions, and the safety and practicality are greatly enhanced. Embodiment 4

[0072] Embodiment 4 of the present invention provides an electric device, the electric device includes a battery module or a battery pack. The battery module or battery pack is configured as a battery provided in any of the above embodiments. Therefore, the electric device also includes all the technical effects of the above batteries. Since the technical effects of the battery have been described in detail above, they will not be repeated here. Embodiment 5

[0073] Reference Fig.11 As shown, the fifth embodiment of the present invention provides a battery assembly method for assembling any battery in the first to third embodiments. The battery assembly method comprises the following steps: A plurality of battery cells 1 are arranged in sequence along a first direction, and a plug-in gap is formed between adjacent battery cells 1. The thickness direction of the battery cell 1 is consistent with the first direction, and end walls 11 with opposite polarities are provided at both ends of the battery cell 1 along the first direction, and the end walls 11 on both sides of the plug-in gap have opposite polarities.

[0074] The connector 2 not filled with medium is arranged in the plug-in gap. When not filled with medium, the connector 2 has a smaller deformation degree, smaller volume and smaller thickness. When the connector 2 is inserted between adjacent battery cells 1, the connector 2 is located in the plug-in gap.

[0075] The medium is filled into the chamber 4 of the connector 2 until the connector 2 is deformed and abuts against the end walls 11 on both sides of the insertion gap.

[0076] When filling the medium, for each connecting piece 2 , the medium can be injected from the injection hole 31 and sealed after injection; the medium can also be injected into the connecting piece 2 from the first connecting pipe 7 or the second connecting pipe 8 .

[0077] For the connector 2 provided with the chamber monomers 41 and connected, the medium can be injected and evenly distributed through the connection between the chambers 4; for the connector 2 provided with the chamber monomers 41 and not connected to each other, the injection can be set separately for each chamber 4. For the chamber monomers 41 provided with the medium pipe 6, the medium is directly injected into the medium pipe 6 through the first shell 3.

[0078] After the medium is injected, the connector 2 expands and deforms, fills the insertion gap and fully contacts and fits with the end wall 11, thereby realizing the electrical connection between two adjacent battery cells 1. Similarly, in the first direction, every two adjacent battery cells 1 are electrically connected through the connector 2, thus completing the series connection of multiple battery cells 1 without poles, thereby realizing battery grouping.

[0079] Embodiment 5 of the present invention provides a battery assembly method, which provides a more reliable group connection method through the setting of the connector 2. It matches the structure of the poleless battery and meets the electrical connection requirements when grouped. The connector 2 is squeezed between the two end walls 11, with a large contact surface and a tight fit. It is not easy to affect the electrical connection effect due to working conditions, and the safety is better. It solves the hard contact problem between battery cells 1 and avoids damage to mechanical components caused by stress superposition.

[0080] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0081] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0082] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery, characterized in that: include: A battery cell (1) and a connector (2); A plurality of battery cells (1) are arranged along a first direction; in the first direction, the battery cells (1) comprise two end walls (11) with opposite polarities and arranged opposite to each other; in the first direction, the connecting member (2) is located between two adjacent battery cells (1); The connecting member (2) comprises a first shell (3) and a chamber (4) located inside the first shell (3); the first shell (3) is configured to deform when the chamber (4) is filled with a medium; the first shell (3) respectively abuts against two end walls (11) of opposite polarities of adjacent battery cells (1); the adjacent battery cells (1) are electrically connected to the first shell (3) via the end walls (11).

2. The battery according to claim 1, characterized in that A conductive member is provided in the chamber (4), and the conductive member at least connects the area where the first shell (3) abuts against the two end walls (11).

3. The battery according to claim 2, characterized in that The conductive member comprises a plurality of mutually independent conductive sheets (51), and two ends of the conductive sheets (51) are respectively connected to areas where the first shell (3) abuts against the two end walls (11); Alternatively, the conductive member is configured as a honeycomb structure (52), and the honeycomb structure (52) is connected to the inner wall of the first shell (3).

4. The battery according to claim 3, characterized in that The thickness of the conductive sheet (51) is greater than or equal to 30 μm and less than or equal to 50 μm.

5. The battery according to any one of claims 2 to 4, characterized in that The conductive member divides the chamber (4) into a plurality of chamber monomers (41); The chamber monomer (41) is used to contain the filled medium; Alternatively, a closed medium tube (6) is provided in the chamber monomer (41), the medium tube (6) is insulated from the conductive member, and the medium tube (6) is used to contain the filled medium.

6. The battery according to claim 1, characterized in that The material of the first shell (3) is set to be a conductive metal; the first shell (3) is provided with an injection hole (31) and a sealing member (32), the injection hole (31) is connected to the chamber (4), and the sealing member (32) is used to seal the injection hole (31).

7. The battery according to claim 1, characterized in that The battery further comprises a first connecting tube (7), the first connecting tube (7) being provided in plurality, and the first connecting tube (7) being used to connect the chambers (4) of the adjacent connecting members (2); Alternatively, the battery further comprises a second connecting pipe (8), the second connecting pipe (8) comprising a main path (81) and a branch path (82), the two ends of the main path (81) being connected to the medium supply device, and the branch path (82) being connected to the corresponding chamber (4) of the connecting member (2) and the main path (81).

8. The battery according to claim 1, characterized in that The medium is configured as a cooling liquid or a cooling gas.

9. An electrical device, characterized in that: The electric device comprises the battery according to any one of claims 1 to 8.

10. A battery assembly method, characterized in that: include: Arranging a plurality of battery cells (1) in sequence along a first direction, forming an insertion gap between adjacent battery cells (1); wherein end walls (11) with opposite polarities are provided at both ends of the battery cells (1) along the first direction, and the end walls (11) on both sides of the insertion gap have opposite polarities; The connecting piece (2) not filled with a medium is arranged correspondingly in the plug-in gap; The medium is filled into the chamber (4) of the connecting piece (2) until the connecting piece (2) is deformed and abuts against the end walls (11) on both sides of the insertion gap.

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