Battery, battery pack, electric device, energy storage device and charging system

Abstract

The application relates to the technical field of batteries, and provides a battery, a battery pack, a power utilization device, an energy storage device and a charging system, which can solve the problem that the energy density of a battery is difficult to improve in the related art. The battery comprises a battery shell, an electrode terminal, an electrode assembly, an insulating film and a support group, the battery shell comprises oppositely arranged first and second shell walls and a shell side wall; the electrode assembly is arranged in the battery shell, the electrode assembly comprises a first end face arranged close to the first shell wall, a second end face arranged close to the second shell wall and two main faces; the insulating film is wrapped on the outer side of the electrode assembly; the support group is arranged between the second shell wall and the second end face; the support group comprises at least one support, and the length direction of the support surface of the support is arranged obliquely relative to a first direction; wherein the first direction is the arrangement direction of the two main faces. The application can be used on a power utilization device such as a vehicle.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery, battery pack, power device, energy storage device and charging system. Background Technology

[0002] In recent years, battery technology has developed rapidly, which has strongly promoted the continuous increase in the market share of new energy vehicles. However, as new energy vehicles become increasingly popular and integrated into people's lives, driving range has become a prominent pain point. To alleviate users' range anxiety, it is necessary to increase the capacity of the battery pack, which usually means increasing the size of the battery pack. However, the space that new energy vehicles can provide for the battery pack is limited. When the battery pack space cannot be further expanded, increasing the energy density of individual cells becomes the key way to increase the capacity of the battery pack.

[0003] Among them, how to tap into the usable space inside the battery to improve its energy density has become one of the important topics in the industry. Utility Model Content

[0004] Embodiments of this application provide a battery, a battery pack, an electrical device, an energy storage device, and a charging system to solve the problem of difficulty in improving battery energy density in related technologies.

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0006] In a first aspect, embodiments of this application provide a battery, including a battery casing, electrode terminals, an electrode assembly, an insulating film, and a support assembly; the battery casing includes a first shell wall and a second shell wall disposed opposite to each other, and a shell sidewall connected between the first shell wall and the second shell wall; the electrode terminals are disposed on the first shell wall; the electrode assembly is disposed in the battery casing, the electrode assembly is a stacked structure or a flat wound structure, and includes a first end face disposed near the first shell wall, a second end face disposed near the second shell wall, and two main surfaces connected between the first end face and the second end face and disposed opposite to each other, the first end face is provided with tabs, and the tabs are electrically connected to the electrode terminals; the insulating film covers the outside of the electrode assembly; the support assembly is disposed between the second shell wall and the second end face, and is used to support the electrode assembly; the support assembly includes at least one support member, the support member has a support surface on the side near the electrode assembly, the support surface has a length direction, and the length direction of the support surface is inclined relative to a first direction; wherein, the first direction is the arrangement direction of the two main surfaces.

[0007] In this embodiment of the battery, the supporting surface of the support member is inclined relative to the first direction along its length. This allows the supporting surface to have a certain span in both the first and second directions, thus providing a larger area of ​​planar support. This allows the supporting surface to support more positive electrode layers, negative electrode layers, and separator layers. By using one or more support members in the support group, the electrode assembly can be independently supported. Therefore, a base plate is not needed at the bottom of the electrode assembly, allowing for a larger design of the electrode assembly and improving the battery's energy density.

[0008] In some embodiments of the first aspect, the second end face has a first edge and a second edge arranged along a first direction. Along the length direction of the support surface, the first end of the support surface is located at the first edge, and the second end of the support surface is located at the second edge. This arrangement allows the support surface to support a greater number of positive electrode layers, negative electrode layers, and separator layers, which is beneficial for improving the support effect of the support assembly on the electrode assembly.

[0009] In some embodiments of the first aspect, along a first direction, the electrode assembly includes alternately stacked positive and negative electrode layers, and a separator layer disposed between adjacent positive and negative electrode layers; the projection of the support surface onto the second end face overlaps with each positive electrode layer, each negative electrode layer, and each separator layer of the electrode assembly. This arrangement allows the support surface to support more positive electrode layers, negative electrode layers, and separator layers, which is beneficial for further improving the support effect of the support assembly on the electrode assembly.

[0010] In some embodiments of the first aspect, the angle α between the length direction of the support surface and the first direction satisfies: 45°≤α≤75°. This configuration ensures that the support surface supports more positive electrode layers, negative electrode layers, and separator layers, while also providing good support for the electrode assembly in the second direction.

[0011] In some embodiments of the first aspect, the support assembly includes two supports arranged at intervals along a second direction; and a pressure relief portion is provided on the second shell wall between the two supports for releasing the internal pressure of the battery casing; wherein the first direction, the second direction, and the arrangement directions of the first end face and the second end face are perpendicular to each other. This arrangement allows the support assembly to provide better support for the electrode assembly while reducing the number of supports in the assembly; furthermore, it avoids structural interference between the pressure relief portion and the supports, thereby ensuring unobstructed ventilation channels around the pressure relief portion.

[0012] In some embodiments of the first aspect, a first air guide channel is provided between the electrode assembly and the shell sidewall, and a second air guide channel is provided between the insulating film and the second shell wall, the second air guide channel being connected to the first air guide channel; a third air guide channel is provided on the support member, extending through the support member along the width direction of the support surface, to connect the second air guide channels located on both sides of the support member. This arrangement avoids the support member obstructing the expanding gas, thereby making the exhaust channels around the pressure relief section more unobstructed.

[0013] In some embodiments of the first aspect, the third air guide channel penetrates the surface of the support member away from the electrode assembly. The third air guide channel is spaced apart from the support surface. Along a direction perpendicular to the support surface, the dimension h1 of the third air guide channel and the dimension h2 of the support member satisfy: h1 = (0.4~0.8)h2. This arrangement ensures the strength of the support member and also improves the exhaust efficiency of the third air guide channel.

[0014] In some embodiments of the first aspect, the insulating film includes a first film region located on the side of the electrode assembly near the second shell wall, and the first film region has a clearance through-hole; the support member is an insulating heat conductor, and at least the support member forms a heat conduction channel, which passes through the clearance through-hole and thermally connects the electrode assembly to the second shell wall. This arrangement helps to improve the heat dissipation efficiency of the electrode assembly, thereby reducing the temperature rise of the electrode assembly under high-rate operation.

[0015] In some embodiments of the first aspect, the support member passes through the clearance hole and directly contacts the electrode assembly and the second shell wall, respectively. This arrangement simplifies the structure of the heat conduction channel, reduces the number of contact surfaces in the heat conduction channel, and thus helps to improve the heat conduction efficiency of the heat conduction channel.

[0016] In some embodiments of the first aspect, the support is a structural ceramic component. This configuration not only allows the support to provide good support for the electrode assembly but also to provide good heat dissipation for the electrode assembly.

[0017] In some embodiments of the first aspect, the battery casing is an aluminum casing or an aluminum alloy casing. This configuration can further improve the heat dissipation effect of the electrode assembly.

[0018] Secondly, embodiments of this application provide a battery pack including a busbar and a plurality of batteries as described in the first aspect, wherein the busbar electrically connects the electrode terminals of the plurality of batteries.

[0019] The beneficial effects of the battery pack in this embodiment are the same as those of the battery in the first aspect, and will not be repeated here.

[0020] Thirdly, embodiments of this application provide an electrical device, including an electrical component, and a battery as described in the first aspect or a battery pack as described in the second aspect, the battery or battery pack being used to provide electrical energy to the electrical component.

[0021] The beneficial effects of the electrical device in this embodiment are the same as those of the battery in the first aspect, and will not be repeated here.

[0022] Fourthly, embodiments of this application provide an energy storage device, including the battery pack described in the second aspect, the battery pack being used to store or provide electrical energy.

[0023] The beneficial effects of the energy storage device in this application embodiment are the same as those of the battery in the first aspect, and will not be repeated here.

[0024] Fifthly, embodiments of this application provide a charging system, including a charging pile and the energy storage device described in the fourth aspect, wherein the energy storage device is electrically connected to the charging pile.

[0025] The beneficial effects of the charging system in this application embodiment are the same as those of the battery in the first aspect, and will not be repeated here. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a battery in related technologies;

[0027] Figure 2 for Figure 1 The battery shown is a bottom view after the battery casing has been removed.

[0028] Figure 3 This is a schematic diagram of the battery structure in the first embodiment of this application;

[0029] Figure 4 for Figure 3 A schematic diagram of the battery structure from another perspective;

[0030] Figure 5 for Figure 3 The exploded view of the battery shown;

[0031] Figure 6 for Figure 3 A cross-sectional view of the battery shown in the image;

[0032] Figure 7 for Figure 3 BB cross-sectional view of the battery shown;

[0033] Figure 8 for Figure 6 The battery shown is a top view after the electrode assembly and first housing wall have been removed.

[0034] Figure 9 for Figure 6 The battery shown is a bottom view after the battery casing has been removed.

[0035] Figure 10 for Figure 5 A schematic diagram of the second end face of the electrode assembly shown;

[0036] Figure 11 for Figure 10 A partial enlarged view of the second end face shown in the figure;

[0037] Figure 12 This is a schematic diagram of the second end face of another electrode assembly of the battery in some embodiments of this application;

[0038] Figure 13 This is a schematic diagram of the second end face of a third electrode assembly of a battery in some embodiments of this application;

[0039] Figure 14 This is a cross-sectional view (AA) of the battery in the second embodiment of this application;

[0040] Figure 15 This is a BB cross-sectional view of the battery in the second embodiment of this application;

[0041] Figure 16 for Figure 14 A schematic diagram of the supporting components for the battery.

[0042] Figure 17 for Figure 14 CC cross-sectional view of the battery;

[0043] Figure 18 This is a cross-sectional view (AA) of the battery in the third embodiment of this application;

[0044] Figure 19 This is a BB cross-sectional view of the battery in the third embodiment of this application;

[0045] Figure 20 for Figure 18 The battery shown is a DD cross-sectional view.

[0046] Figure 21 for Figure 18 The diagram shows the unfolded view of the insulating film of the battery.

[0047] Figure 22 The diagram shows the schematic of a battery pack in some embodiments of this application.

[0048] Figure 23 This is a schematic diagram of an electrical device in some embodiments of this application;

[0049] Figure 24This is a schematic diagram of an electrical device in some other embodiments of this application;

[0050] Figure 25 This is a schematic diagram of a charging system in some embodiments of this application. Detailed Implementation

[0051] In recent years, battery technology (such as lithium-ion power batteries) has developed rapidly, which has strongly promoted the continuous increase in the market share of new energy vehicles. However, as new energy vehicles become increasingly popular and integrated into people's lives, driving range has become a prominent pain point. To alleviate users' range anxiety, it is necessary to increase the capacity of the battery pack, which usually means increasing the size of the battery pack. However, the space that new energy vehicles can provide for the battery pack is limited. When the battery pack space cannot be further expanded, increasing the energy density of individual cells becomes the key way to increase the capacity of the battery pack.

[0052] Among them, how to tap into the usable space inside the battery to improve its energy density has become one of the important topics in the industry.

[0053] Figure 1 This is a schematic diagram of the structure of a battery in related technologies. Figure 2 for Figure 1 The image shows a bottom view of the battery after the battery casing has been removed. Figure 1 and Figure 2 As shown, the battery includes a battery casing 1, electrode terminals 2, electrode assembly 3, insulating film 4, support member 51, and base plate 8.

[0054] The battery casing 1 includes a first casing wall 11 and a second casing wall 12 disposed opposite to each other, and a casing sidewall 13 connecting the first casing wall 11 and the second casing wall 12; the second casing wall 12 is provided with a pressure relief part 6, which can release the internal pressure of the battery casing 1 when thermal runaway occurs inside the battery casing 1. The pressure relief part 6 can be a weak area on the second casing wall 12.

[0055] Electrode terminals 2 are disposed on the first shell wall 11; electrode assembly 3 (also known as bare cell) is disposed in the battery shell 1, and electrode assembly 3 is provided with tab 34 at one end near the first shell wall 11, and tab 34 is electrically connected to electrode terminal 2; insulating film 4 covers the outside of electrode assembly 3.

[0056] The bottom support plate 8 is located on the side of the electrode assembly 3 near the second shell wall 12, and the support member 51 is a strip block structure and is located between the bottom support plate 8 and the second shell wall 12.

[0057] The support member 51 is used to support the electrode assembly 3. The bottom plate 8 is used to increase the contact area with the electrode assembly 3, so as to reduce the impact of vibration on the bottom support member 51 on the electrode assembly 3, thereby avoiding damage to the electrode assembly 3.

[0058] However, the base plate 8 has a certain thickness, and its placement will occupy the space at the bottom of the battery casing 1, thus reducing the space for the electrode assembly 3 and adversely affecting the improvement of battery energy density.

[0059] Therefore, embodiments of this application provide a battery, a battery pack, an electrical device, an energy storage device, and a charging system. By providing a support member at the bottom of the electrode assembly, and with the support surface of the support member inclined, the support member can provide support over a larger area, thus eliminating the need for a bottom support plate and thereby improving the energy density of a single battery cell.

[0060] The battery (also called a battery cell) in this application embodiment can be a secondary battery, which refers to a battery that can be used again after being discharged by recharging to activate the active materials.

[0061] The type of battery is not unique; for example, the battery can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0062] Figure 3 This is a schematic diagram of the structure of the battery 100 in the first embodiment of this application. Figure 4 for Figure 3 A structural schematic diagram of battery 100 from another perspective. Figure 5 for Figure 3 An exploded view of battery 100 is shown. Figure 3 , Figure 4 and Figure 5 As shown, the battery 100 includes a battery casing 1, electrode terminals 2, electrode assembly 3, insulating film 4, and support assembly 5.

[0063] The battery casing 1 includes a first casing wall 11 and a second casing wall 12 disposed opposite to each other, and a casing sidewall 13 connecting the first casing wall 11 and the second casing wall 12. Electrode terminals 2 are disposed on the first casing wall 11. The electrode terminals 2 can be columnar structures, and in this case, the electrode terminals 2 can also be referred to as terminals. The battery casing 1 can be a square casing structure, for example, a cuboid casing structure.

[0064] In some embodiments, such as Figure 3 and Figure 5As shown, the second shell wall 12 and the shell sidewall 13 can be an integral structure, and the edge of the first shell wall 11 is connected to the shell sidewall 13 (e.g., by welding, bonding, etc.). In other embodiments, the first shell wall 11 and the second shell wall 12 can also be separately provided from the shell sidewall 13, and the first shell wall 11 and the second shell wall 12 are connected to the shell sidewall 13 by welding, bonding, or other connection methods.

[0065] like Figure 5 , Figure 6 and Figure 7 As shown, Figure 6 for Figure 3 A cross-sectional view of battery 100 shown in Figure AA. Figure 7 for Figure 3 The image shows a BB cross-sectional view of the battery 100. The electrode assembly 3 is disposed in the battery casing 1. The electrode assembly 3 includes a first end face 31 disposed near the first casing wall 11, a second end face 32 disposed near the second casing wall 12, and two main faces 33 disposed opposite to each other between the first end face 31 and the second end face 32. The first end face 31 is provided with tabs 34, which are electrically connected to the electrode terminals 2.

[0066] In some embodiments, such as Figure 5 As shown, the tab 34 can be extended from the edge of the first end face 31.

[0067] In some embodiments, the tab 34 and the electrode terminal 2 can be in direct contact to achieve electrical connection, specifically as follows: Figure 6 and Figure 7 As shown, the outer end of electrode terminal 2 protrudes from the outer surface of the first housing wall 11, and the inner end of electrode terminal 2 protrudes from the inner surface of the first housing wall 11 and is in direct contact with the tab 34. However, it is not limited to this. In other embodiments, the tab 34 can also be in contact with electrode terminal 2 through a conductive connector (such as a spring) to achieve electrical connection.

[0068] The electrode terminal 2 includes a positive terminal and a negative terminal, and the electrode tab 34 includes a positive tab and a negative tab. The positive tab is electrically connected to the positive terminal, and the negative tab is electrically connected to the negative terminal.

[0069] In some embodiments, such as Figure 5 and Figure 7 As shown, the number of electrode assemblies 3 can be multiple (e.g., Figure 5 The number of electrode components 3 shown is two, and multiple electrode components 3 are arranged side by side, with the main surfaces 33 of two adjacent electrode components 3 in contact. In some other embodiments, the number of electrode components 3 may also be one.

[0070] like Figure 10 and Figure 11 As shown, Figure 10 for Figure 5A schematic diagram of the second end face 32 of the electrode assembly 3 shown. Figure 11 for Figure 10 The diagram shows a partial enlarged view of the second end face 32. Along the first direction X, the electrode assembly 3 includes alternating layers of positive electrode 35 and negative electrode 36, and a separator layer 37 disposed between adjacent positive electrode 35 and negative electrode 36; wherein, the first direction X is the arrangement direction of the two main faces 33 of the electrode assembly 3.

[0071] The structure of electrode assembly 3 is not unique; in some embodiments, such as... Figure 10 and Figure 11 As shown, electrode assembly 3 can be a flat wound structure. The flat wound structure is formed by stacking the positive electrode, negative electrode and separator in a certain order, winding them, and then flattening them.

[0072] Among them, the positive electrode layer 35 is a stacked section formed by the positive electrode after being wound and flattened along the first direction X; the negative electrode layer 36 is a stacked section formed by the negative electrode after being wound and flattened along the first direction X; and the separator layer 37 is a stacked section formed by the separator after being wound and flattened along the first direction X.

[0073] In other embodiments, such as Figure 12 and Figure 13 As shown, Figure 12 This is a schematic diagram of the second end face 32 of another electrode assembly 3 of the battery 100 in some embodiments of this application. Figure 13 This is a schematic diagram of the second end face 32 of a third type of electrode assembly 3 of the battery 100 in some embodiments of this application. The electrode assembly 3 may also be a stacked structure.

[0074] Among them, there are various forms of laminated structures, such as Figure 12 As shown, there are multiple positive electrode layers 35 and multiple negative electrode layers 36, and the multiple positive electrode layers 35 and multiple negative electrode layers 36 are stacked alternately. The separator layer 37 is a folded section formed by folding the separator, and the separator layer 37 is disposed between adjacent positive electrode layers 35 and negative electrode layers 36.

[0075] For example Figure 13 As shown, there are multiple negative electrode layers 36, positive electrode layers 35 are folded segments formed by folding positive electrode sheets, and each negative electrode layer 36 is disposed between two adjacent positive electrode layers 35. The separator layer 37 is a folded segment formed by folding a separator, and the separator layer 37 is disposed between adjacent positive electrode layers 35 and negative electrode layers 36.

[0076] like Figure 5 , Figure 6 and Figure 7As shown, the insulating film 4 covers the outside of the electrode assembly 3. The insulating film 4 can isolate the electrode assembly 3 from the battery casing 1, effectively preventing the electrode assembly 3 from directly contacting the battery casing 1 and causing a short circuit, thus avoiding safety hazards such as leakage, overheating or even fire in the battery 100.

[0077] Among them, such as Figure 5 , Figure 6 and Figure 7 As shown, the insulating film 4 includes a first film region 41, and a second film region 42 and a third film region 43 connected to the edge of the first film region 41. There are two second film regions 42 and two third film regions 43. The two second film regions 42 are arranged along a first direction X, and the two third film regions 43 are arranged along a second direction Y. The first film region 41 covers the second end face 32, and the second film region 42 covers the main surface 33. The first direction X, the second direction Y, and the arrangement direction Z of the first end face 31 and the second end face 32 are all perpendicular to each other.

[0078] like Figure 5 , Figure 8 and Figure 9 As shown, Figure 8 for Figure 6 The battery 100 shown is a top view after the electrode assembly 3 and the first housing wall 11 have been removed. Figure 9 for Figure 6 The battery 100 shown is a bottom view after the battery casing 1 has been removed. The support assembly 5 is disposed between the second casing wall 12 and the second end face 32 and is used to support the electrode assembly 3.

[0079] The support assembly 5 includes multiple support members 51 (or may include one support member 51). The support member 51 has a support surface 511 on the side near the electrode assembly 3. The support surface 511 has a length direction L, and the length direction L of the support surface 511 is inclined relative to the first direction X.

[0080] The number of support groups 5 is equal to the number of electrode assemblies 3, such as... Figure 9 As shown, when there are multiple electrode assemblies 3 (e.g., two), there are also multiple support groups 5 (e.g., two), each support group 5 supporting a corresponding electrode assembly 3. When there are multiple support members 51 in the support group 5, the angle α between the support surfaces 511 of the multiple support members 51 and the first direction X can be equal or unequal, depending on the actual situation. The inclination direction of the support surfaces 511 of the multiple support members 51 in the support group 5 can be the same, for example... Figure 9 In the support assembly 5, the left ends of the support surfaces 511 of the support members 51 located on the left and right sides are all raised relative to the right ends; of course, the inclination directions of the support surfaces 511 of multiple support members 51 in the support assembly 5 can be different, for example... Figure 9As shown, in the support member group 5, the left end of the support surface 511 of the support member 51 located on the left side is raised relative to the right end, and the support member 51 located on the right side can be replaced with the support surface 511 having the right end raised relative to the left end.

[0081] In some embodiments, such as Figure 5 As shown, the support member 51 can be a block structure; of course, it is not limited to this, and the support member 51 can also be set into other structures according to the actual situation.

[0082] In some embodiments, the support member 51 may be made of polymer insulating materials such as PP, PE, and PET. However, it is not limited to these materials, and the support member 51 may also be made of other insulating materials.

[0083] In this embodiment of the battery 100, the length direction L of the support surface 511 of the support member 51 is inclined relative to the first direction X. This allows the support surface 511 to have a certain span in both the first direction X and the second direction Y, thus providing a larger area of ​​planar support. This allows the support surface 511 to support more positive electrode layers 35, negative electrode layers 36, and separator layers 37. One or more support members 51 in the support member group 5 can cooperate to independently support the electrode assembly 3. Therefore, a bottom support plate is not required for the electrode assembly 3, allowing for a larger design volume and improving the energy density of the battery 100.

[0084] In some embodiments, such as Figure 9 As shown, the support surface 511 has an angle α between its length direction L and the first direction X, satisfying: 45°≤α≤75°. This setting avoids the angle α being too large or too small. If the angle α is too large, the span of the support surface 511 in the first direction X will be small, which is not conducive to the support surface 511 supporting more positive electrode layers 35, negative electrode layers 36, and separator layers 37. If the angle α is too small, the span of the support surface 511 in the second direction Y will be small, which is not conducive to supporting the electrode assembly 3 in the second direction Y.

[0085] By setting the included angle α to 45°≤α≤75°, the support surface 511 can have a reasonable span in both the first direction X and the second direction Y. This ensures that the support surface 511 supports more positive electrode layers 35, negative electrode layers 36 and separator layers 37, while also providing good support for the electrode assembly 3 in the second direction Y.

[0086] Wherein, the span of the support surface 511 in the first direction X refers to the size of the support surface 511 in the first direction X, and the span of the support surface 511 in the second direction Y refers to the size of the support surface 511 in the second direction Y.

[0087] To improve the support effect of the support assembly 5 on the electrode assembly 3, in some embodiments, such as Figure 9 and Figure 11 As shown, the second end face 32 of the electrode assembly 3 has a first edge 321 and a second edge 322 arranged along the first direction X. Along the length direction L of the support surface 511, the first end of the support surface 511 is located at the first edge 321, and the second end of the support surface 511 is located at the second edge 322.

[0088] By setting the first end of the support surface 511 at the first edge 321 and the second end at the second edge 322, the span of the support surface 511 in the first direction X is increased. In this way, the support surface 511 can support more positive electrode layers 35, negative electrode layers 36 and separator layers 37, which is beneficial to improving the support effect of the support assembly 5 on the electrode assembly 3, thereby reducing the probability of misalignment between the electrode layers and separator layers 37 of the electrode assembly 3.

[0089] To further improve the support effect of the support assembly 5 on the electrode assembly 3, in some embodiments, such as Figure 11 , Figure 12 and Figure 13 As shown, the projection 39 of the support surface 511 on the second end face 32 overlaps with each positive electrode layer 35, each negative electrode layer 36, and each separator layer 37 of the electrode assembly 3. That is, the support surface 511 of the support member 51 provides support for each positive electrode layer 35, each negative electrode layer 36, and each separator layer 37 of the electrode assembly 3. With this configuration, the support surface 511 can support more positive electrode layers 35, negative electrode layers 36, and separator layers 37, which is beneficial to further improve the support effect of the support member group 5 on the electrode assembly 3, thereby preventing misalignment between the electrode layers and separator layers 37 of the electrode assembly 3.

[0090] In some embodiments, such as Figure 6 and Figure 8 As shown, the support assembly 5 includes two support members 51, which are arranged at intervals along the second direction Y; and a pressure relief part 6 is provided on the second shell wall 12 between the two support members 51, which is used to release the internal pressure of the battery shell 1.

[0091] By providing two support members 51 arranged along the second direction Y in the support member group 5, the supporting force on the electrode assembly 3 in the second direction Y can be made more uniform. This not only makes the support member group 5 provide better support for the electrode assembly 3, but also reduces the number of support members 51 in the support member group 5. In addition, the pressure relief part 6 is provided on the second shell wall 12 between the two support members 51 in the support member group 5. This allows the pressure relief part 6 to make full use of the space between the support members 51, avoids structural interference between the pressure relief part 6 and the support members 51, and ensures the unobstructed exhaust passage around the pressure relief part 6.

[0092] The type of pressure relief section 6 is not unique; in some embodiments, such as... Figure 6 As shown, the pressure relief section 6 can be a weak area on the second shell wall 12, and the thickness of the weak area is less than the thickness of the second shell wall 12 surrounding the weak area. In other embodiments, the pressure relief section 6 can also be a pressure relief mechanism such as an explosion-proof valve, explosion-proof disc, gas valve, pressure relief valve, or safety valve.

[0093] In some embodiments, such as Figure 5 , Figure 8 and Figure 9 As shown, there are two electrode assemblies 3, which are arranged side by side and their main surfaces 33 are in contact with each other; there are two support groups 5, which are arranged along the first direction X, and each support group 5 has two support members 51 arranged along the second direction Y; a part of the pressure relief part 6 is located between the two support members 51 of one support group 5, and the other part of the pressure relief part 6 is located between the two support members 51 of the other support group 5.

[0094] Figure 14 This is a cross-sectional view (AA) of the battery 100 in the second embodiment of this application. Figure 15 This is a BB cross-sectional view of the battery 100 in the second embodiment of this application. Figure 16 for Figure 14 A schematic diagram of the structure of the support member 51 of the battery 100. Figure 17 for Figure 14 CC cross-sectional view of battery 100.

[0095] To ensure smoother ventilation of the exhaust channels surrounding the pressure relief section 6, in some embodiments, such as... Figure 14 and Figure 15 As shown, a first air guide channel 14 is provided between the electrode assembly 3 and the shell sidewall 13, and a second air guide channel 15 is provided between the insulating film 4 and the second shell wall 12. The second air guide channel 15 is connected to the first air guide channel 14. Figure 14 , Figure 16 and Figure 17As shown, the support member 51 is provided with a third air guide channel 52. Along the width direction W of the support surface 511, the third air guide channel 52 passes through the support member 51 to connect the second air guide channels 15 located on both sides of the support member 51.

[0096] By providing a third venting channel 52 on the support member 51, when an abnormality occurs in the internal pressure of the battery casing 1, the expanding gas around the pressure relief section 6 (such as the expanding gas flowing from the second venting channel 15 to the first venting channel 14) can pass through the support member 51 via the third venting channel 52 and flow to the pressure relief section 6. Figure 17 The dashed arrow in the middle shows the path of a portion of the expanding gas, preventing the support 51 from blocking the expanding gas, thereby making the exhaust passage around the pressure relief part 6 more unobstructed and improving exhaust efficiency.

[0097] In some embodiments, such as Figure 14 and Figure 16 As shown, the third air guide channel 52 penetrates the surface of the support member 51 away from the electrode assembly 3. The third air guide channel 52 is spaced apart from the support surface 511 and is arranged along the direction H perpendicular to the support surface 511. The size h1 of the third air guide channel 52 and the size h2 of the support member 51 satisfy: h1 = (0.4~0.8)h2. For example, h1 can be 0.4h2, 0.5h2, 0.6h2, 0.7h2, 0.8h2, etc.

[0098] This design avoids the third air guide channel 52 being too large or too small in size. If the size h1 is too large, the gap between the third air guide channel 52 and the support surface 511 will be too small, which will not be conducive to improving the strength of the support member 51. If the size h1 is too small, the cross-sectional area of ​​the third air guide channel 52 will be small, which will affect the exhaust efficiency of the third air guide channel.

[0099] By setting the size h1 to h1 = (0.4~0.8)h2, the size h1 can be made moderate, which not only ensures the strength of the support 51, but also helps to improve the exhaust efficiency of the third air passage.

[0100] Among them, such as Figure 16 As shown, the third air guide channel 52 can be a groove, but it is not limited to this. The third air guide channel 52 can also be a hole or other cavity structure.

[0101] In this embodiment, the pressure relief part 6 is not limited to being disposed on the second shell wall 12; it can also be disposed on the first shell wall 11. The support assembly 5 can also include a support member 5, the first end of the support surface 511 of which is located at the end of the first edge 321 (e.g., Figure 9 The second end of the support surface 511 is located at the end of the second edge 322 (e.g., at the left end of the first edge 321 shown). Figure 9 (as shown at the right end of the second edge 322).

[0102] Figure 18 This is a cross-sectional view (AA) of the battery 100 in the third embodiment of this application. Figure 19 This is a BB cross-sectional view of the battery 100 in the third embodiment of this application. Figure 20 for Figure 18 The DD cross-sectional view of battery 100 shown is shown. Figure 21 for Figure 18 The diagram shows the unfolded view of the insulating film 4 of the battery 100.

[0103] To improve the heat dissipation efficiency of electrode assembly 3, in some embodiments, such as Figure 20 and Figure 21 As shown, the first membrane region 41 is provided with a clearance through hole 411; as Figure 18 and Figure 19 As shown, the support member 51 is an insulating heat conductor. At least the support member 51 forms a heat conduction channel, which passes through the avoidance through hole 411 and heat conducts the electrode assembly 3 to the second shell wall 12.

[0104] By setting up heat conduction channels, the heat generated by the electrode assembly 3 can be transferred to the battery casing 1 for heat dissipation, thereby improving the heat dissipation efficiency of the electrode assembly 3 and reducing the temperature rise of the electrode assembly 3 under high-rate use. Simultaneously, since at least the support member 51 constitutes a heat conduction channel, that is, by utilizing the support member 51 as a component of the heat conduction channel, the structure of the support member 51 is fully utilized, eliminating the need for additional heat conduction structures. This simplifies the structure of the battery 100 and reduces its cost.

[0105] In this case, the number of clearance through holes 411 on the first membrane region 41 is equal to the number of support members 5. When there are multiple support members 5 (e.g., four), the number of clearance through holes 411 is also multiple (e.g., four).

[0106] The specific structure of the heat conduction channel is not unique. In some embodiments, the heat conduction channel can have the following structure: such as Figure 19 and Figure 20 As shown, the support member 51 passes through the clearance hole 411 and is in direct contact with both the electrode assembly 3 and the second shell wall 12. In other words, the support member 51 forms a heat conduction channel. This arrangement simplifies the structure of the heat conduction channel, reduces the number of contact surfaces within the channel, and thus improves the heat conduction efficiency, which in turn further enhances the heat dissipation efficiency of the electrode assembly 3.

[0107] In other embodiments, the heat conduction channel may also have the following structure: the through hole 411 is filled with a heat conduction material layer, one side of the heat conduction material layer protrudes from the inner surface of the first film region 41 and is in direct contact with the electrode assembly 3, the other side of the heat conduction material layer protrudes from the outer surface of the first film region 41, the support member 51 is disposed between the heat conduction material layer and the second shell wall 12 and is in direct contact with the heat conduction material layer and the second shell wall 12 respectively, and the heat conduction material layer and the support member 5 constitute a heat conduction channel.

[0108] The material of the support member 51 is not unique; in some embodiments, such as... Figure 18 and Figure 19 As shown, the support member 51 is a structural ceramic component. Due to the high strength and good thermal conductivity of structural ceramic components, by setting the support member 51 as a structural ceramic component, not only can the support member 51 provide a good support effect for the electrode assembly 3, but it can also provide a good heat dissipation effect for the electrode assembly 3.

[0109] The structural ceramic components can be made of materials such as Al2O3 ceramics, AlN ceramics, BeO ceramics, and Si3N4 ceramics.

[0110] In addition to being a structural ceramic component, the support component 51 can also be a thermally conductive silicone component.

[0111] To further improve the heat dissipation effect of electrode assembly 3, in some embodiments, such as Figure 18 and Figure 19 As shown, the battery casing 1 is an aluminum casing or an aluminum alloy casing.

[0112] The above describes the structure of battery 100. The following section introduces the application scenarios of battery 100.

[0113] Figure 22 This is a schematic diagram of the battery pack 500 in some embodiments of this application. For example... Figure 22 As shown, this application embodiment provides a battery pack 500, including a busbar 200 and a plurality of batteries 100, wherein the busbar 200 electrically connects the electrode terminals 2 of the plurality of batteries 100.

[0114] In some embodiments, such as Figure 22 As shown, the busbar component 200 connects multiple batteries 100 in parallel. However, it is not limited to this; the busbar component 200 can also connect multiple batteries 100 in series or in a mixed configuration.

[0115] In some embodiments, such as Figure 22 As shown, the battery pack 500 also includes a housing 510, a plurality of batteries 100 and a current collector 200 disposed in the housing 510, and an output terminal 520 provided on the housing 510, the output terminal 520 being electrically connected to the current collector 200.

[0116] In some embodiments, the bus component 200 can be a busbar, which is a metal strip or sheet made of a highly conductive material (such as copper, aluminum or copper-aluminum composite material). The busbar connects the electrode terminals 2 of multiple batteries 100 respectively to achieve series connection (to increase voltage) or parallel connection (to increase capacity) and concentrates the current to the output terminal 520.

[0117] Figure 23 This is a schematic diagram of an electrical device in some embodiments of this application. Figure 24 This is a schematic diagram of an electrical device in some other embodiments of this application. For example... Figure 23 and Figure 24 As shown, this application provides an electrical device, including an electrical component (300) and a battery pack 500 or a battery 100 as described in any of the above embodiments. The battery pack 500 or the battery 100 is used to provide electrical energy to the electrical component 300.

[0118] Among them, electrical devices are various electrical devices that use batteries 100, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and aircraft, etc. Among them, aircraft include airplanes, rockets, space shuttles and spacecraft.

[0119] The aforementioned electrical device 300 refers to a device or component that relies on electrical energy to work and achieve a specific function. For example, when the electrical device is a mobile phone, the electrical device 300 can be a display screen, microphone, camera, etc.; or when the electrical device is a vehicle, the electrical device can be a motor that drives the wheels to rotate, etc.

[0120] Figure 25 This is a schematic diagram of a charging system in some embodiments of this application. For example... Figure 25 As shown in the figure, this application provides a charging system including a charging pile 700 and an energy storage device 600, wherein the energy storage device 600 is electrically connected to the charging pile 700.

[0121] The energy storage device 600 includes a battery pack 500, which is used to store or provide electrical energy. The battery pack 500 is electrically connected to the charging pile 700 via a cable. The battery pack 500 can provide the electrical energy it stores to the charging pile 700. The charging pile 700 has one or more connectors 710 (such as a charging gun), which are used to connect to electrical equipment (such as a vehicle) so as to replenish the power of the electrical equipment.

[0122] In some embodiments, such as Figure 25 As shown, the energy storage device 600 may include multiple battery packs 500 connected in parallel and electrically connected to the charging pile 700 via cables. In other embodiments, the energy storage device 600 may include a single battery pack 500.

[0123] In some embodiments, such as Figure 25 As shown, the energy storage device 600 can be located outside the charging pile 700. However, it is not limited to this; the energy storage device 600 can also be located inside the charging pile 700, forming an integrated energy storage and charging unit.

[0124] While the description of this application is presented in conjunction with some embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may arise based on the claims of this application. To provide a thorough understanding of this application, many specific details are included in the above description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0125] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0126] In the embodiments of this application, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0127] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The directional terms mentioned in the embodiments of this application, such as "upper," "lower," "left," "right," "inner," and "outer," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. "Multiple" refers to at least two.

[0128] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0129] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery, characterized in that, include: The battery casing (1) includes a first casing wall (11) and a second casing wall (12) disposed opposite to each other, and a casing sidewall (13) connected between the first casing wall (11) and the second casing wall (12); Electrode terminals (2) are disposed on the first shell wall (11); An electrode assembly (3) is disposed in the battery casing (1). The electrode assembly (3) is a stacked structure or a flat wound structure, and includes a first end face (31) disposed near the first casing wall (11), a second end face (32) disposed near the second casing wall (12), and two main faces (33) connected between the first end face (31) and the second end face (32) and disposed opposite to each other. The first end face (31) is provided with a tab (34), and the tab (34) is electrically connected to the electrode terminal (2). An insulating film (4) is wrapped around the outside of the electrode assembly (3); A support assembly (5) is disposed between the second shell wall (12) and the second end face (32) and is used to support the electrode assembly (3); the support assembly (5) includes at least one support member (51), the support member (51) has a support surface (511) on the side near the electrode assembly (3), the support surface (511) has a length direction (L), and the length direction (L) of the support surface (511) is inclined relative to the first direction (X); wherein, the first direction (X) is the arrangement direction of the two main surfaces (33).

2. The battery according to claim 1, characterized in that, The second end face (32) has a first edge (321) and a second edge (322) arranged along the first direction (X). Along the length direction (L) of the support surface (511), the first end of the support surface (511) is located at the first edge (321), and the second end of the support surface (511) is located at the second edge (322).

3. The battery according to claim 1 or 2, characterized in that, Along the first direction (X), the electrode assembly (3) includes alternating layers of positive electrode (35) and negative electrode (36), and a separator layer (37) disposed between adjacent positive electrode (35) and negative electrode (36); The projection (39) of the support surface (511) on the second end face (32) overlaps with each of the positive electrode layer (35), each of the negative electrode layer (36) and each of the separator layer (37) of the electrode assembly (3).

4. The battery according to any one of claims 1 to 3, characterized in that, The angle α between the length direction (L) of the support surface (511) and the first direction (X) satisfies: 45°≤α≤75°.

5. The battery according to any one of claims 1 to 4, characterized in that, The support assembly (5) includes two support members (51) arranged at intervals along the second direction (Y); and a pressure relief part (6) is provided on the second shell wall (12) between the two support members (51), the pressure relief part (6) is used to release the internal pressure of the battery shell (1); wherein the first direction (X), the second direction (Y) and the arrangement direction (Z) of the first end face (31) and the second end face (32) are perpendicular to each other.

6. The battery according to claim 5, characterized in that, The electrode assembly (3) has a first air guiding channel (14) between it and the shell sidewall (13), and the insulating film (4) has a second air guiding channel (15) between it and the second shell wall (12). The second air guiding channel (15) is connected to the first air guiding channel (14). The support member (51) is provided with a third air guide channel (52), which extends through the support member (51) along the width direction (W) of the support surface (511) to connect the second air guide channels (15) located on both sides of the support member (51).

7. The battery according to claim 6, characterized in that, The third air guide channel (52) penetrates the surface of the support member (51) away from the electrode assembly (3). The third air guide channel (52) is separated from the support surface (511) and is arranged in a direction (H) perpendicular to the support surface (511). The size h1 of the third air guide channel (52) and the size h2 of the support member (51) satisfy: h1 = (0.4~0.8)h2.

8. The battery according to any one of claims 1 to 7, characterized in that, The insulating film (4) includes a first film region (41), which is located on the side of the electrode assembly (3) near the second shell wall (12). The first film region (41) is provided with a clearance through hole (411). The support member (51) is an insulating heat conductor. At least the support member (51) forms a heat conduction channel. The heat conduction channel passes through the clearance through hole (411) and heat conducts the electrode assembly (3) to the second shell wall (12).

9. The battery according to claim 8, characterized in that, The support member (51) passes through the clearance through hole (411) and is in direct contact with the electrode assembly (3) and the second shell wall (12), respectively.

10. The battery according to claim 8 or 9, characterized in that, The support member (51) is a structural ceramic component; and / or, the battery casing (1) is an aluminum casing or an aluminum alloy casing.

11. A battery pack, characterized in that, It includes a busbar (200) and a plurality of batteries (100) according to any one of claims 1 to 10, wherein the busbar (200) electrically connects the electrode terminals (2) of the plurality of batteries (100).

12. An electrical appliance, characterized in that, It includes an electrical device (300) and a battery (100) according to any one of claims 1 to 10 or a battery pack (500) according to claim 11, wherein the battery (100) or the battery pack (500) is used to provide electrical energy to the electrical device (300).

13. An energy storage device, characterized in that, Includes the battery pack (500) of claim 11, the battery pack (500) being used to store or provide electrical energy.

14. A charging system, characterized in that, It includes a charging pile (700) and an energy storage device (600) as described in claim 13, wherein the energy storage device (600) is electrically connected to the charging pile (700).

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