Battery module, power storage device, and electric appliance
By using a retractable and deformable busbar in the battery assembly, the misalignment and expansion problems during battery cell connection are solved, the reliability and assembly efficiency of the battery assembly are improved, and the adaptability and application range are enhanced.
Patent Information
- Application Number
- CN202323496317.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-21
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2033-12-21
AI Technical Summary
In existing battery components, busbar misalignment or desoldering due to errors and expansion during connection of battery cells, which affects the reliability and connection stability of the battery.
Using a telescopic deformation busbar, by setting a telescopic deformation busbar between the battery cells, the battery module can be ensured to adapt to the expansion and connection error of the battery cell under the action of external force and maintain stable connection.
It improves the reliability and assembly efficiency of battery components, enhances adaptability, and expands the application range.
Smart Images
Figure CN223140977U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of secondary batteries, and particularly to a battery assembly, a power storage device, and an electrical device. Background Art
[0002] A secondary battery (Rechargeable battery), also known as a rechargeable battery or a storage battery, refers to a battery that can be activated by charging after discharging so that it can be used continuously. When using a secondary battery, a plurality of battery cells of the secondary battery can be connected through a bus bar, and in the form of series and / or parallel connection, high-voltage, high-capacity, or high-power electrical energy output can be achieved.
[0003] However, when current battery cells are connected, due to errors in the size of the outer shell of the battery assembly, there may be misalignment when using the same specification of bus bars to connect two adjacent batteries, affecting the connection of the batteries; at the same time, since heat is generated during the use of the secondary battery, it may cause the secondary battery to expand, resulting in the bus bar being desoldered from the battery terminal post, causing an open circuit and affecting the reliability of the battery. Summary of the Utility Model
[0004] Based on this, it is necessary to provide a battery assembly, a power storage device, and an electrical device with good adaptability, strong reliability, and capable of improving battery assembly efficiency.
[0005] In a first aspect, the present application provides a battery assembly, including:
[0006] At least two battery cells, each battery cell is stacked along a first direction perpendicular to the first surface of the battery cell, and an end cap is provided at one end of each battery cell in a second direction, and an electrode is provided on the end cap;
[0007] At least one bus bar, a first end of the bus bar is connected to the electrode of any one of the battery cells, and a second end of the bus bar is connected to the electrode of an adjacent battery cell adjacent to any one of the battery cells; wherein, the bus bar is elastically deformed along the first direction under the action of an external force.
[0008] In one embodiment, the bus bar includes a first connection portion, a main body portion, and a second connection portion connected in sequence, wherein:
[0009] The first connection portion is connected to the electrode of any one of the battery cells;
[0010] The second connection portion is connected to the electrode of the adjacent battery cell;
[0011] The main body portion includes an induced deformation unit and an elastic unit, the elastic unit is configured such that the bus bar is elastically deformed along the first direction under the action of an external force, and the induced deformation unit is configured to reduce the external force required for the elastic unit to elastically deform along the first direction.
[0012] In one embodiment, the elastic unit includes a corrugated unit. The cross-section of the corrugated unit in the second direction is corrugated. The corrugated unit is configured such that under the action of an external force, the corrugation of the corrugated unit unfolds along the first direction; in a preferred embodiment, the corrugated unit includes an arc wave, a square wave or a triangular wave.
[0013] In one embodiment, the projection of the elastic unit on the end cover is defined as the first projection. Concave portions are formed by recessing from both sides of the first projection towards the center. The induced deformation unit includes the concave portions, and the concave portions are used to reduce the external force required for the elastic unit to expand and contract under the action of an external force.
[0014] In one embodiment, the induced deformation unit includes a hollowed-out unit. The hollowed-out unit penetrates the elastic unit along the first direction, such that the elastic unit is in a hollowed-out state, or the hollowed-out units are symmetrically distributed on both sides of the elastic unit.
[0015] In one embodiment, the hollowed-out unit has a shape that is wide at both ends and narrow in the middle.
[0016] In one embodiment, the cross-sectional area of the main body portion in the second direction is smaller than the cross-sectional area of the first connecting portion or the second connecting portion in the second direction;
[0017] Alternatively, the thickness of the main body portion gradually decreases from the first connecting portion and the second connecting portion towards the center along the first direction.
[0018] In one embodiment, the battery cell further includes a housing and an electrode assembly. The electrode assembly is accommodated in the housing in a wound manner or a stacked manner.
[0019] In a second aspect, the present application provides an electricity storage device. The electricity storage device includes a box body, and a plurality of battery assemblies as provided in the first aspect are provided in the box body. The first surface of the battery cell in each battery assembly is perpendicular to the second surface of the box body.
[0020] In a third aspect, the present application provides an electrical equipment. The electrical equipment includes the electricity storage device as provided in the second aspect, and the electricity storage device is used to supply power to the electrical equipment.
[0021] The above battery assembly, power storage device, and electrical equipment include at least two battery cells and at least one bus bar in the battery assembly. Each battery cell is stacked along a first direction perpendicular to the first surface of the battery cell. One end of each battery cell in a second direction is provided with an end cap, and the end cap is provided with an electrode. The first end of the bus bar is connected to the electrode of any one battery cell, and the second end of the bus bar is connected to the electrode of an adjacent battery cell adjacent to any one battery cell. Among them, the bus bar expands and contracts along the first direction under the action of an external force. In this application, by arranging a bus bar that can expand and contract between battery cells, the battery assembly is not easily misaligned during operation. When the battery cells in the battery assembly expand, due to the expandability of the bus bar, the battery cells between the battery assemblies will not be disconnected, improving the reliability of the battery assembly. The power storage device provided in this application includes a plurality of battery assemblies, and the power storage device has a high assembly efficiency, strong adaptability, and a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0023] Figure 1 Schematic diagram of a battery assembly according to an embodiment;
[0024] Figure 2 For Figure 1 Top view of the battery assembly in
[0025] Figure 3 Schematic diagram of the structure of a bus bar according to an embodiment;
[0026] Figure 4 For Figure 2 Top view of the bus bar in
[0027] Figure 5 Schematic diagram of the main body of a bus bar according to another embodiment;
[0028] Figure 6 Schematic diagram of the structure of a battery cell according to an embodiment;
[0029] Figure 7 Schematic diagram of the accommodation of an electrode assembly in a battery cell according to an embodiment;
[0030] Figure 8 Schematic diagram of the accommodation of an electrode assembly in a battery cell according to another embodiment;
[0031] Figure 9Explosion structure schematic diagram of an energy storage device according to an embodiment;
[0032] Figure 10 Explosion structure schematic diagram of an energy storage device according to another embodiment.
[0033] Explanation of reference numerals:
[0034] 10. Battery assembly; 100. Battery cell; 110. End cap; 120. Electrode; 122. First electrode; 124. Second electrode; 130. Explosion-proof valve; 140. End plate; 150. Housing; 160. Electrode assembly; 162. First electrode assembly; 164. Second electrode assembly; 170. Separator; 200. Bus bar; 210. First connection part; 220. Main body part; 222. Elastic unit; 223. Concave part; 224. Hollow unit; 230. Second connection part; 20. Energy storage device; 202. Box cover; 204. Box body. Detailed implementation manners
[0035] For the convenience of understanding the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.
[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the specification of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application.
[0037] It can be understood that the terms "first", "second", etc. used in the present application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element. For example, without departing from the scope of the present application, the first resistor can be called the second resistor, and similarly, the second resistor can be called the first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.
[0038] It can be understood that "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is an electrical signal or data transfer between the connected circuits, modules, units, etc.
[0039] It can be understood that "at least one" means one or more, and "a plurality" means two or more. "At least a part of an element" means a part or all of the element.
[0040] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprises / comprising", "has / including", etc. specify the presence of the stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the related listed items.
[0041] With the increasing maturity of lithium battery technology, secondary batteries are widely used in passenger vehicles and engineering vehicles to provide power for them; and are also used in energy storage systems or uninterruptible power supplies to achieve continuous power supply and peak shaving and valley filling, reducing the power supply pressure on the power grid. In order to achieve high voltage, high capacity or high power of the secondary battery, generally, a plurality of battery cells 100 are connected by a bus bar 200 to connect the positive electrode posts and negative electrode posts, forming a series-connected and / or parallel-connected electricity storage device 20 to provide electrical energy.
[0042] In an exemplary embodiment, as Figure 1 and Figure 2 shown, the battery assembly 10 includes at least two battery cells 100 and at least one bus bar 200. Each battery cell 100 is stacked along a first direction perpendicular to the first surface of the battery cell 100. At one end of each battery cell 100 in a second direction, there is an end cap 110, and the end cap 110 is provided with an electrode 120; the first end of the bus bar 200 is connected to the electrode 120 of any one battery cell, and the second end of the bus bar 200 is connected to the electrode 120 of an adjacent battery cell adjacent to any one battery cell; wherein, the bus bar 200 is elastically deformed along the first direction under the action of an external force.
[0043] Wherein, the first surface of the battery cell 100 may be the largest surface of the battery cell 100. Stacking the battery cells 100 along the first direction perpendicular to the first surface can reduce the area of the stacked battery assembly 10. As shown in the figure, each battery cell 100 is provided with an end cap 110 at one end in the second direction, and the end cap 110 is provided with an electrode 120. The electrode 120 is used to connect the battery cell 100 to the outside. When the battery cells 100 are stacked to form the battery assembly 10, the electrodes 120 of adjacent battery cells 100 are connected by the bus bar 200, and the finally formed battery assembly 10 includes a first electrode 122 with opposite polarity and a second electrode 124.
[0044] Exemplarily, as Figure 1 and Figure 2As shown, each bus bar 200 connects two adjacent battery cells 100. Since there are two electrodes 120 with opposite polarities on the end cap 110 of each battery cell 100, which can be represented as the first electrode 122 and the second electrode 124, each electrode is insulated and arranged on the end cap 110, that is, each electrode penetrates through the end cap 110 in an insulated manner. Both ends of the electrode are located on both sides of the end cap 110. One end of the electrode is connected to the electrode assembly 160, and the other end of the electrode is exposed outside the end cap 110 for connecting external devices.
[0045] For the battery assembly 10 proposed in this embodiment, when multiple battery cells 100 are stacked along the first direction, each battery cell 100 is connected by a bus bar 200. For example, the first electrode 122 of the first battery cell and the first electrode 122 of the second battery cell are connected by a first bus bar, the second electrode 124 of the second battery cell and the second electrode 124 of the third battery cell are connected by a second bus bar, the first electrode 122 of the third battery cell and the first electrode 122 of the fourth battery cell are connected by a third bus bar, and so on, thus forming the battery assembly 10.
[0046] In one embodiment, in combination with Figure 1 and Figure 2 As shown, for both ends of the battery assembly 10 formed by stacking multiple battery cells 100, end plates 140 are further provided. The end plates 140 are used to isolate and support the stacked battery cells 100 to prevent the battery assembly 10 from being damaged due to external impacts or vibrations during use. In addition, the end plates 140 can also conduct electricity and dissipate heat for the battery cells 100 to ensure that the temperatures of the battery cells 100 in the battery assembly 10 are within a controllable range, improving the performance and lifespan of the battery assembly 10. Further, I / O interfaces for connecting to external devices can also be provided on the end plates 140, so that the battery assembly 10 can communicate and integrate with other external devices through the I / O interfaces.
[0047] In one embodiment, in combination with Figure 1 and Figure 2, an explosion-proof valve 130 is also provided on the end cap 110 of the battery cell 100. The explosion-proof valve 130 is disposed between the two electrodes 120 of the end cap 110 and is a safety device installed on the battery cell 100 to prevent the battery cell 100 from exploding due to excessive gas pressure generated during the charging or discharging process. When the battery cell 100 is operating, internal chemical reactions may generate gas. If the generated gas cannot be discharged in time, it will cause the internal pressure of the battery cell 100 to increase, and even trigger an explosion. The explosion-proof valve 130 can rupture when the internal pressure of the battery cell 100 reaches a certain level, and the high-pressure substances inside the battery cell 100 will spray out from the explosion-proof valve 130 for pressure relief. The explosion-proof valve 130 usually uses an explosion-proof sheet. When the internal pressure of the battery cell 100 exceeds the set value, the valve of the explosion-proof valve 130 will open to release the internal pressure of the battery cell 100. The design of the explosion-proof valve 130 can effectively improve the safety and stability of the battery cell 100 and avoid safety accidents caused by abnormal internal pressure of the battery cell 100.
[0048] In one embodiment, as Figure 3 and Figure 4 shown, the bus bar 200 includes a first connection portion 210, a main body portion 220, and a second connection portion 230 that are connected in sequence. The first connection portion 210 is connected to the electrode 120 of any one battery cell; the second connection portion 230 is connected to the electrode 120 of an adjacent battery cell; the main body portion 220 includes an induced deformation unit and an elastic unit 222. The elastic unit 222 is configured such that the bus bar 200 expands and contracts along a first direction under an external force, and the induced deformation unit is configured to reduce the external force required for the elastic unit 222 to expand and contract along the first direction.
[0049] As Figure 3 , Figure 4 and Figure 5 shown, the bus bar 200 includes a first connection portion 210, a main body portion 220, and a second connection portion 230 that are connected in sequence. Combining Figures 1 to 3 , the bus bar 200 realizes the connection of adjacent battery cells 100 along the stacking direction of the battery cells 100. The first connection portion 210 is connected to the electrode 120 of any one battery cell, and the second connection portion 230 is connected to the electrode 120 of an adjacent battery cell adjacent to any one battery cell.
[0050] Among them, the main body portion 220 includes an elastic unit 222, and the elastic unit 222 deforms when the bus bar 200 is subjected to an external force. When the battery cell 100 expands due to heat, an external force will be generated to stretch the bus bar 200 to both sides. The setting of the elastic unit 222 enables the bus bar 200 to be stretched when subjected to an external force to maintain the connection between the bus bar 200 and the battery cell 100.
[0051] Exemplarily, the external force can refer to the force applied at both ends of the bus bar 200 when the length of the bus bar 200 does not match the distance between the electrodes 120 of two adjacent battery cells 100 when the battery cells 100 are stacked into the battery assembly 10. Alternatively, the external force can also refer to the expansion force generated by the expansion of the battery cells 100 during charging and discharging in the battery assembly 10, etc. The elastic unit 222 is provided on the bus bar 200 in this embodiment, and when the bus bar 200 is subjected to an external force, it can also ensure the normal connection of the battery assembly 10, improving the reliability of the battery assembly 10.
[0052] In one embodiment, in order to further improve the reliability of the bus bar 200, as shown in Figure 4 Define the projection of the elastic unit 222 on the end cap 110 as the first projection. Concave portions 223 are formed by concave inward from both sides of the first projection, and the induced deformation unit includes the concave portions 223.
[0053] Among them, when the elastic unit 222 is projected onto the surface of the end cap 110, the first projection of the projection of the elastic unit 222 presents a structure concave inward from both sides to form the concave portions 223. The induced deformation unit includes the concave portions 223. The concave portions 223 are used to reduce the magnitude of the external force required for the elastic unit 222 to deform, and are used to improve the safety of the battery assembly 10. For example, when a thermal runaway occurs in the battery cell 100, the bus bar 200 can break at the elastic unit 222, improving the safety of the battery assembly 10 during operation.
[0054] In an exemplary embodiment, the elastic unit 222 can include a waveform unit. The cross-section of the waveform unit in the second direction is in a waveform shape, and the waveform unit is arranged such that the waveform of the waveform unit of the bus bar 200 unfolds along the first direction under the action of an external force. Preferably, the waveform unit 222 includes an arc wave, a square wave, or a triangular wave.
[0055] Exemplarily, the waveform unit enables the bus bar 200 to have elasticity through a wavy undulation design, and is used to absorb the force received by the bus bar 200 along the stacking direction of the battery cells 100. For example, when the bus bar 200 is subjected to an external force stretching it to both sides, the waveform unit extends, and when the external force disappears, the waveform unit returns to its original state. The wave shape of the waveform unit includes an arc wave, a square wave, or a triangular wave, and the specific shape can be defined according to actual requirements.
[0056] It can be understood that the above waveform unit can also adopt other forms, rather than being limited to the forms already mentioned in the above embodiments, as long as it can achieve telescopic deformation when the bus bar 200 is subjected to an external force to improve the reliability of the battery assembly 10.
[0057] In one embodiment, the induced deformation unit further includes a hollowing unit 224. The hollowing unit 224 penetrates the elastic unit 222 along the first direction, such that the elastic unit 222 is in a hollow state, or the hollowing units 224 are symmetrically distributed on both sides of the elastic unit 222.
[0058] Wherein, the induced deformation unit of the main body portion 220 further includes a hollowing unit 224. The hollowing unit 224 is used to reduce the force required for the main body portion 220 of the bus bar 200 to deform along the stacking direction of the battery cells 100. The hollowing unit 224 is disposed on the main body portion 220 and can be used to at least reduce the cross-sectional area of the main body portion 220 in the thickness direction. The hollowing unit 224 may be as Figure 3 or Figure 4 shown, penetrating the elastic unit 22 along the first direction, such that the elastic unit 222 is in a hollow state; or, the hollowing units 224 may also be as Figure 5 shown, symmetrically distributed on both sides of the elastic unit 222.
[0059] In an exemplary embodiment, in combination with Figures 3 to 5 , the hollowing unit 224 is in a shape that is wide at both ends and narrow in the middle.
[0060] In combination with Figure 3 and Figure 4 , when the hollowing unit 224 is disposed to penetrate the elastic unit 222, the hollowing unit 224 may be designed to be wider at the portions connected to the first connecting portion 210 and the second connecting portion 230 and narrower in the middle along with the arrangement of the elastic unit 222. In combination with Figure 5 , when the hollowing units 224 are distributed on both sides of the elastic unit 222, they may be as Figure 5 (a) shown, with each hollowing unit 224 being in a shape that is wide at both ends and narrow in the middle, or may be as Figure 5 (b) shown, with each hollowing unit 224 being in a shape that is wide at one end and narrow at the other end. Among them, the shape that is wide at both ends and narrow in the middle can better reduce the force required for the main body portion 220 of the bus bar 200 to deform along the stacking direction of the battery cells 100. At the same time, the relatively narrower middle part uses less material and can also reduce the weight of the main body portion 220.
[0061] It can be understood that the above-mentioned hollowing unit 224 may also adopt other forms and is not limited to the forms already mentioned in the above embodiments, as long as it can achieve the function of reducing the force required for the main body portion 220 of the bus bar 200 to deform along the stacking direction of the battery cells 100.
[0062] In one embodiment, the cross-sectional area of the main body portion 220 in the second direction is smaller than the cross-sectional area of the first connecting portion 210 or the second connecting portion 230 in the second direction. In a preferred solution, the thickness of the main body portion 220 gradually decreases from the first connecting portion 210 and the second connecting portion 230 towards the center along the first direction, where the thickness of the main body portion 220 is the dimension of the main body portion 220 along the second direction.
[0063] To improve the reliability and safety of the battery module 10 and make the bus bar 200 easy to disconnect when the battery cell 100 is heated, the main body portion 220 of the bus bar 200 is set to have a smaller thickness than the first connecting portion 210 or the second connecting portion 230, specifically manifested in that the cross-sectional area of the main body portion 220 in the second direction is smaller than the cross-sectional area of the first connecting portion 210 or the second connecting portion 230 in the second direction.
[0064] In one embodiment, the battery cell 100 further includes a housing 150 and an electrode assembly 160, and the electrode assembly 160 is accommodated in the housing 150 in a wound manner or a stacked manner.
[0065] As Figure 6 shown, the battery cell 100 includes a housing 150, and an electrode assembly 160 is disposed inside the cavity formed by the housing 150 of the battery cell 100. One end of the battery cell 100 in the second direction is provided with an end cap 110, the end cap 110 seals the battery cell 100, and an electrode 120 and an explosion-proof valve 130 are provided on the end cap 110.
[0066] The plane perpendicular to the first direction of the battery cell 100 is the largest plane of the battery cell 100, and this largest plane is defined as the first surface of the battery cell 100. As Figure 6 shown, when the electrode assembly 160 is disposed in the housing 150 of the battery cell 100, the electrode assembly 160 is parallel to the first surface of the battery cell 100.
[0067] The electrode assembly 160 includes a first electrode assembly 162 and a second electrode assembly 164 with opposite polarities, and the two electrode assemblies 160 are alternately disposed in the housing 150. As Figure 7 shown, the first electrode assembly 162 and the second electrode assembly 164 are spaced apart and accommodated in the housing 150 in a wound manner, and a separator 170 is provided between the electrode assemblies 160 for isolation. As Figure 8 shown, the first electrode assembly 162 and the second electrode assembly 164 are spaced apart and accommodated in the housing 150 in a stacked manner, and a separator 170 is provided between the electrode assemblies 160 for isolation.
[0068] It can be understood that the above electrode assembly 160 can also be arranged in the housing 150 of the battery cell 100 in other forms, not limited to the forms mentioned in the above embodiments, as long as it can form the battery cell 100.
[0069] In one embodiment, an electricity storage device 20 is disclosed. The electricity storage device 20 includes a box body, and a plurality of battery assemblies 10 as proposed in the above embodiments are arranged in the box body. The first surface of each battery cell 100 in each battery assembly 10 is perpendicular to the second surface of the box body.
[0070] As Figure 9 and Figure 10 shown, the box body of the electricity storage device 20 includes a box cover 202 and a box body 204, and the battery assembly 10 is arranged inside the cavity defined by the box body 204. The electricity storage device 20 can include a plurality of battery assemblies 10. The second surface of the box body is the largest surface of the electricity storage device 20. By arranging the first surface of each battery cell 100 in the battery assembly 10 perpendicular to the second surface of the box body, more battery cells 100 can be accommodated in the box body.
[0071] As Figure 9 shown, when the battery assembly 10 is arranged in the electricity storage device 20, the end caps 110 of each battery cell 100 in the battery assembly 10 are perpendicular to the box cover 202; as Figure 10 shown, when the battery assembly 10 is arranged in the electricity storage device 20, the end caps 110 of each battery cell 100 in the battery assembly 10 can also be parallel to the box cover 202.
[0072] It can be understood that the above electricity storage device 20 can also adopt other forms, not limited to the forms mentioned in the above embodiments, as long as it can achieve the accommodation of the battery assembly 10.
[0073] In one embodiment, an electrical device is provided. The electrical device includes the electricity storage device 20 as proposed in the above embodiments, and the electricity storage device 20 is used to supply power to the electrical device.
[0074] Exemplarily, if the electrical device using the electricity storage device 20 as a power source is a vehicle, during installation, the second surface of the electricity storage device 20, that is, the largest surface of the electricity storage device 20, can be parallel to the plane where the battery chassis is located in the vehicle, that is, the first surface of each battery cell 100 in the battery assembly 10 is perpendicular to the plane where the battery chassis is located in the vehicle.
[0075] The battery assembly 10, the power storage device 20, and the electrical equipment using the power storage device 20 provided in the present application are provided with an elastic unit 222 and a hollow unit 224 for inducing deformation on the bus bar 200 of the battery assembly 10. When there are differences in the specifications of the battery cells 100, adaptation is carried out through the deformation of the elastic unit 222, and the versatility is relatively strong. At the same time, during the charging and discharging process of the battery cell 100, if the battery cell 100 deforms due to expansion, it can also be absorbed through the induced deformation area of the bus bar 200, preventing the expansion of the battery cell 100 from affecting the connection between the bus bar 200 and the electrode 120.
[0076] In the description of this specification, the description referring to terms such as "some embodiments" and "other embodiments" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.
[0077] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.
[0078] The above-described embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.
Claims
1. A battery component, characterized in that, Comprising: At least two battery cells, each of the battery cells being stacked along a first direction perpendicular to a first face of the battery cell, one end of each of the battery cells in a second direction being provided with an end cap, the end cap being provided with two electrodes, and the first face of the battery cell being the largest face of the battery cell; At least one bus bar, a first end of the bus bar being connected to an electrode of any one of the battery cells, and a second end of the bus bar being connected to an electrode of an adjacent battery cell adjacent to the any one battery cell; wherein, the bus bar is elastically deformed along the first direction under the action of an external force, and the extending direction of the bus bar is the first direction; The end cap of the battery cell is provided with an explosion-proof valve, the explosion-proof valve being arranged between the two electrodes of the end cap, and the projection of the explosion-proof valve on the surface of the end cap and the projection of the bus bar on the surface of the end cap do not overlap; End plates, the end plates being arranged at both ends of a battery assembly formed by stacking the at least two battery cells.
2. The battery assembly according to claim 1, wherein The bus bar includes a first connecting portion, a main body portion and a second connecting portion connected in sequence, wherein: The first connecting portion is connected to the electrode of the any one battery cell; The second connecting portion is connected to the electrode of the adjacent battery cell; The main body portion includes an induced deformation unit and an elastic unit, the elastic unit being configured such that the bus bar is elastically deformed along the first direction under the action of an external force, and the induced deformation unit being configured to reduce the external force required for the elastic unit to elastically deform along the first direction.
3. The battery assembly according to claim 2, wherein The elastic unit includes a corrugated unit, the cross-section of the corrugated unit in the second direction being corrugated, and the corrugated unit being configured such that the corrugation of the corrugated unit of the bus bar unfolds along the first direction under the action of an external force.
4. The battery component according to claim 2, characterized in that Define the projection of the elastic unit on the end cap as a first projection, and concave portions are formed by recessing from both sides of the first projection towards the center, and the induced deformation unit includes the concave portions.
5. The battery assembly according to claim 2, wherein, The induced deformation unit includes a hollowed-out unit, the hollowed-out unit penetrating through the elastic unit along the first direction such that the elastic unit is in a hollowed-out state; Alternatively, the hollowed-out units are symmetrically distributed on both sides of the elastic unit.
6. The battery assembly according to claim 5, wherein, The hollowed-out unit is in a shape that is wide at both ends and narrow in the middle.
7. The battery assembly according to claim 2, characterized in that, The cross-sectional area of the main body portion in the second direction is smaller than the cross-sectional area of the first connecting portion or the second connecting portion in the second direction; Alternatively, the thickness of the main body portion gradually decreases from the first connecting portion and the second connecting portion towards the center along the first direction.
8. The battery assembly according to claim 1, wherein, The battery cell further includes a housing and an electrode assembly, and the electrode assembly is accommodated in the housing in a wound manner or a stacked manner.
9. An electricity storage device, characterized in that, Comprising a box body, wherein a plurality of battery assemblies as described in any one of claims 1-8 are provided in the box body, and the first faces of the battery cells in each of the battery assemblies are perpendicular to the second face of the box body.
10. An electrical device, characterized in that, Comprising a power storage device as described in claim 9, and the power storage device is used to supply power to the electrical equipment.