Battery modules, batteries and electrical devices

Abstract

The present application relates to a battery module, a battery and an electrical device. The battery module includes a plurality of battery cells, a buffer mechanism and a busbar. The plurality of battery cells are arranged along a first direction; the buffer mechanism is provided at at least one end of the plurality of battery cells along the first direction; the busbar is provided at at least one side of the plurality of battery cells along a second direction, and the pole ears of each battery cell are connected to the busbar, and the second direction intersects with the first direction; wherein the busbar has a guide portion, and the guide portion is movably connected to a portion of the buffer mechanism along the first direction. The busbar in the battery module can guide part of the buffer mechanism to speed up the movement speed of the buffer mechanism along the first direction when it is subjected to an external force. In this way, there is no need to provide additional guide members, which reduces the number of components required in the battery module and speeds up the assembly efficiency of the battery module.

Description

Technical Field

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

[0002] During the charge and discharge process of ion batteries, the battery cells can expand and contact the end plates near the battery cells, which can easily squeeze the end plates and cause them to deform. In order to improve the deformation problem of the end plates, a buffer mechanism is generally set near the battery cells to provide a better expansion force environment for the battery cells. This results in a more complex internal structure of the battery module, which requires a lot of time to assemble the battery module, reducing assembly efficiency. Utility Model Content

[0003] In view of the above problems, the present application provides a battery module, a battery and an electrical device, which can improve the problem of low assembly efficiency of the battery module caused by the complex internal structure of the battery module.

[0004] In a first aspect, the present application provides a battery module, which includes a plurality of battery cells, a buffer mechanism, and a busbar. The plurality of battery cells are arranged along a first direction; the buffer mechanism is provided at at least one end of the plurality of battery cells along the first direction; the busbar is provided at at least one side of the plurality of battery cells along a second direction, and the tabs of each battery cell are connected to the busbar, and the second direction intersects with the first direction; wherein the busbar has a guide portion, and the guide portion is movably connected to a portion of the buffer mechanism along the first direction.

[0005] In the technical solution of the embodiment of the present application, the current collector can guide part of the buffer mechanism to speed up the movement speed of the buffer mechanism along the first direction when it is subjected to external force. When the buffer mechanism moves under the push of the battery cell, the probability of deformation of the buffer mechanism due to the external force applied by the battery cell and damage to the battery cell can be reduced.

[0006] Secondly, in addition to the function of collecting current, the collector can also guide the part of the buffer mechanism that can move along the first direction. In this way, there is no need to set up additional guides, which reduces the number of components required in the battery module and speeds up the assembly efficiency of the battery module.

[0007] In some embodiments, the buffer mechanism includes a movably connected fixing member and a buffer member, the buffer member is located between the fixing member and the battery cell, and the buffer member is movably connected to the guide portion of the busbar along a first direction, and the fixing member is fixedly connected to the busbar.

[0008] The above arrangement simplifies the structure of the buffer mechanism and reduces the difficulty of preparing the buffer mechanism.

[0009] In some embodiments, the buffer component is provided with a first through hole, and the guide portion passes through the first through hole to be movably connected with the buffer component.

[0010] Such an arrangement can not only simplify the structure of the buffer component, but also improve the connection stability between the buffer component and the guide portion.

[0011] In some embodiments, the guide portion is a plate-like structure extending along the first direction, and the inner contour shape of the first through hole is adapted to the outer contour shape of the guide portion.

[0012] When the battery cell expands due to charge and applies external force to the buffer, because the buffer is connected to the guide portion through the first through hole, the buffer can move smoothly and quickly along the first direction, which can reduce the probability of the buffer deviating from the preset route during movement and speed up the movement efficiency of the buffer.

[0013] In some embodiments, the busbar and the fixing member are detachably connected.

[0014] When either the busbar or the fixing member is damaged, the damaged one can be replaced with a new one, which can reduce the maintenance cost of the battery module compared to replacing both the busbar and the fixing member.

[0015] In some embodiments, the buffer member includes an elastic connecting portion and an abutting portion, and the elastic connecting portion is located between the abutting portion and the fixing member.

[0016] When the battery cell expands slightly, it can contact the abutting portion to push the abutting portion to move toward the fixing member, thereby improving the movable sensitivity of the abutting portion.

[0017] In some embodiments, the busbar includes a plurality of second through holes and a plurality of power connection portions, the plurality of second through holes and the plurality of power connection portions are cross-arranged along the first direction, and the tabs of the battery cells are connected by passing through the second through holes and the power connection portions.

[0018] The tabs and the power connection part of the battery cell are arranged on the same side, which is convenient for users to connect the tabs and the power connection part of the battery cell together, and the second through hole is convenient for installing the two.

[0019] In some embodiments, an electrical connection portion is provided between any two adjacent second through holes, and two adjacent battery cells form a group. The pole ears of the two battery cells in each group respectively pass through two adjacent second through holes and are electrically connected to the same electrical connection portion, and the pole ears of two adjacent battery cells between adjacent groups can pass through the same second through hole.

[0020] In this way, the number of second through holes can be reduced, thereby reducing the volume of the busbar.

[0021] In some embodiments, the tab of each battery cell passes through the second through hole and is bent along the first direction to be electrically connected to the power connection portion. Along the first direction, the bending size of the tab ranges from 3 mm to 4 mm.

[0022] Because the tab is bent along the first direction, the contact area between the tab and the power connection portion can be increased as much as possible, thereby improving the connection stability between the two.

[0023] In some embodiments, the battery module further includes a heat insulating member disposed between two adjacent battery cells.

[0024] The thermal insulation component can block two adjacent battery cells. When thermal runaway occurs in one battery cell, its impact on the other battery cell can be reduced to minimize the damage to the battery cell.

[0025] In some embodiments, the thermal insulation member is bonded to one of two adjacent battery cells.

[0026] In this way, the thermal insulation member is easily installed, the installation speed of the thermal insulation member is accelerated, and the thermal insulation member can be reused.

[0027] In a second aspect, the present application provides a battery, which includes the battery module in the above embodiment.

[0028] The current collector in the battery can guide part of the buffer mechanism to speed up the movement of the buffer mechanism along the first direction when it is acted upon by an external force. When the buffer mechanism moves under the push of the battery cell, the probability of deformation of the buffer mechanism due to the external force applied by the battery cell and damage to the battery cell can be reduced.

[0029] Secondly, in addition to the function of collecting current, the collector can also guide the part of the buffer mechanism that can move along the first direction. In this way, there is no need to set up additional guides, which reduces the number of components required in the battery module and speeds up the assembly efficiency of the battery module.

[0030] In a third aspect, the present application provides an electrical device, which includes the battery in the above embodiment.

[0031] The current collector in the electrical device can guide part of the buffer mechanism to speed up the movement of the buffer mechanism along the first direction when it is acted upon by an external force. When the buffer mechanism moves under the push of the battery cell, the probability of deformation of the buffer mechanism due to the external force applied by the battery cell and damage to the battery cell can be reduced.

[0032] Secondly, in addition to the function of collecting current, the collector can also guide the part of the buffer mechanism that can move along the first direction. In this way, there is no need to set up additional guides, which reduces the number of components required in the battery module and speeds up the assembly efficiency of the battery module.

[0033] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0035] Figure 1 is a schematic diagram of the structure of a vehicle according to one or more embodiments.

[0036] Figure 2 Schematic diagram of the structure of a battery module according to one or more embodiments.

[0037] Figure 3 is an exploded view of a battery module according to one or more embodiments.

[0038] Figure 4 Schematic diagram of the structure of a busbar of a battery module according to one or more embodiments.

[0039] Figure 5 Schematic diagram of the structure of a battery cell of a battery module according to one or more embodiments.

[0040] The reference numerals in the specific implementation manner are as follows:

[0041] 1000. Electrical devices;

[0042] 100. Battery module;

[0043] 10. Battery cell; 11. Tab;

[0044] 20. Buffer mechanism; 21. Fixing member; 22. Buffer member; 221. First through hole; 222. Elastic connecting portion; 223. Abutting portion;

[0045] 30. busbar; 31. guide portion; 32. second through hole; 33. power connection portion;

[0046] 40. Thermal insulation element; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0047] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0049] In the description of the embodiments of the present application, if technical terms such as "first" and "second" appear, they are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0050] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0051] In the description of the embodiments of the present application, if the term "and / or" appears, it is only a description of the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, if it appears, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0052] In the description of the embodiments of the present application, if it appears, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0053] In the description of the embodiments of the present application, if any, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0054] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, if any technical terms such as "installed", "connected", "connected", "fixed" and the like are to be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0055] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0056] The battery module is composed of battery cells connected in series or in parallel, and can provide sufficient structural support for the battery cells. The battery end plates can restrain the battery cells and effectively control the battery cells when the battery cells expand due to heat, thereby providing installation points for other components. When the battery cells expand during charging, they are prone to collide with the end plates of the shell, causing the end plates to deform. Based on this, a buffer mechanism is usually provided inside the battery module to absorb the expansion force generated by the battery cells during the expansion process and reduce the deformation of the end plates. In this way, more components need to be installed inside the battery module, resulting in a complex internal structure of the battery module, which affects the assembly efficiency of the battery module.

[0057] In order to improve the assembly efficiency of the battery module, an embodiment of the present application provides a battery module. The battery module uses the guide portion of the current collector to guide part of the buffer mechanism, so that the current collector has both the current collector effect and can guide part of the buffer mechanism. In this way, there is no need to set additional guides on the inner wall of the battery module, which simplifies the internal structure of the battery module and speeds up the assembly efficiency of the battery module.

[0058] The battery module disclosed in the embodiment of the present application can be used, but is not limited to, in electrical devices such as vehicles, ships or aircraft, and a power supply system comprising the battery module, batteries, etc. disclosed in the present application can be used for the electrical device.

[0059] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0060] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0061] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery is provided inside the vehicle, and the battery includes the above-mentioned battery module 100, and the battery may be arranged at the bottom, head or tail of the vehicle. The battery can be used to power the vehicle, for example, the battery can be used as an operating power source for the vehicle. The vehicle may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery to power the motor 300, for example, for starting, navigating and driving the vehicle.

[0062] In some embodiments of the present application, the battery can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0063] Combine the following Figure 2 and Figure 3 The specific embodiment shown is illustrative of a battery module 100 .

[0064] like Figure 2 and Figure 3As shown, some embodiments of the present application provide a battery module 100, which includes a plurality of battery cells 10, a buffer mechanism 20, and a busbar 30. The plurality of battery cells 10 are arranged along a first direction X; the buffer mechanism 20 is disposed at at least one end of the plurality of battery cells 10 along the first direction X; the busbar 30 is disposed at at least one side of the plurality of battery cells 10 along a second direction Y, and the tabs 11 of each battery cell 10 are connected to the busbar 30, and the second direction Y intersects with the first direction X; wherein the busbar 30 has a guide portion 31, and the guide portion 31 is movably connected to a portion of the buffer mechanism 20 along the first direction X.

[0065] The battery cell 10 is a component in the battery module 100 that can undergo electrochemical reactions. The battery cell 10 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the battery cell 10, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab 11. The positive tab 11 and the negative tab 11 can be located together at one end of the main body or at both ends of the main body respectively. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 11 connects the electrode terminal to form a current loop.

[0066] The buffer mechanism 20 can be used to limit the battery cell 10, and when the battery cell 10 expands during charging, it can move under the push of the battery cell 10. In the first direction X, a buffer mechanism 20 can be provided at both ends of the plurality of battery cells 10, or a buffer mechanism 20 can be provided at one end of the plurality of battery cells 10.

[0067] The busbar 30 is used to make the electric energy flow in the battery module 100 more uniform and stable, thereby improving the working efficiency and life of the battery module 100. The busbar 30 can be electrically connected to the tab 11 of the battery cell 10. The guide portion 31 of the busbar 30 can be, but is not limited to, a component such as a slide groove or a slide rail extending along the first direction X.

[0068] The structure of the current collector 30 may be, but is not limited to, a plate-like structure, and the guide portion 31 may be protruding from the plate-like structure. For example, the guide portion 31 may be disposed on a side of the plate-like structure facing the battery cell 10. The guide portion 31 may extend along the first direction X. The connection between the guide portion 31 and the buffer 22 may be, but is not limited to, a sliding connection.

[0069] like Figure 2 As shown, a buffer mechanism 20 is respectively provided at both ends of the plurality of battery cells 10 in the first direction X. Some parts of each buffer mechanism 20 close to the battery cell 10 are movably connected to the busbar 30 along the first direction X and can move relative to the battery cell 10.

[0070] When the battery module 100 starts to operate, if the battery cell 10 is charged and expands along the first direction X, the battery cell 10 located at the outermost side along the first direction X can contact some parts of the buffer mechanism 20 and push the part of the buffer mechanism 20 in contact with the battery cell 10 to move along the first direction X. Since part of the buffer mechanism 20 is movably connected to the busbar 30, it can also be understood that the buffer mechanism 20 is divided into two parts in the first direction X: one that can move and one that always remains stationary. The stationary part always remains stationary relative to the busbar 30, and the part that can move can move relative to the busbar 30.

[0071] Therefore, the busbar 30 can guide the portion of the buffer mechanism 20 to speed up the movement of the buffer mechanism 20 along the first direction X when the buffer mechanism 20 is subjected to an external force. When the buffer mechanism 20 moves under the push of the battery cell 10, the probability of deformation of the buffer mechanism 20 due to the external force applied by the battery cell 10 and damage to the battery cell 10 can be reduced.

[0072] Secondly, in addition to the function of collecting current, the collector 30 can also guide the part of the buffer mechanism 20 that can move along the first direction X. In this way, there is no need to set up additional guides, which reduces the number of components required in the battery module 100 and speeds up the assembly efficiency of the battery module 100.

[0073] It should be noted that when the battery module 100 is only provided with a buffer mechanism 20 at one end of the multiple battery cells 10 , the working principle of the buffer mechanism 20 is the same as the working principle of the buffer mechanisms 20 provided at both ends of the multiple battery cells 10 , which will not be repeated here.

[0074] like Figure 2 and Figure 3 As shown, in some embodiments, the buffer mechanism 20 includes a movably connected fixing member 21 and a buffer member 22, the buffer member 22 is located between the fixing member 21 and the battery cell 10, and the buffer member 22 is movably connected to the guide portion 31 of the bus 30 along the first direction X, and the fixing member 21 is fixedly connected to the bus 30.

[0075] The structure of the fixing member 21 may be, but not limited to, a plate-like structure, and the buffer member 22 may be a component that can be deformed. The connection between the fixing member 21 and the buffer member 22 may be, but not limited to, a sliding connection or an elastic connection. The connection between the fixing member 21 and the current collector 30 may be, but not limited to, a threaded connection or a clamping connection.

[0076] When the battery cell 10 expands, the battery cell 10 can first contact the buffer 22 and apply a force along the first direction X to the buffer 22. Because the fixing member 21 and the busbar 30 are fixedly connected, and the fixing member 21 and the buffer 22 are movably connected, the buffer 22 can move toward the fixing member 21 under the action of external force. In addition, during the movement of the battery cell 10, the battery cell 10 is always in the expansion force environment provided by the buffer mechanism 20.

[0077] The above arrangement simplifies the structure of the buffer mechanism 20 and reduces the difficulty of preparing the buffer mechanism 20 .

[0078] Specifically, Figure 3 As shown, in some embodiments, the buffer member 22 is provided with a first through hole 221 , and the guide portion 31 passes through the first through hole 221 to be movably connected with the buffer member 22 .

[0079] Along the first direction, the extension length of the guide portion 31 is greater than the opening depth of the first through hole 221. Along the second direction Y, a first through hole 221 can be provided at both ends of the buffer 22, and there is a one-to-one correspondence between the guide portion 31 and the first through hole 221, that is, one guide portion 31 passes through one first through hole 221 and is connected to the same buffer 22.

[0080] Such a configuration can not only simplify the structure of the buffer member 22 , but also improve the connection stability between the buffer member 22 and the guide portion 31 .

[0081] Please continue reading Figure 3 Specifically, in some embodiments, the guide portion 31 is a plate-shaped structure extending along the first direction X, and the inner contour shape of the first through hole 221 is adapted to the outer contour shape of the guide portion 31 .

[0082] For example, the inner profile of the first through hole 221 is a waist-shaped hole, and the first through hole 221 is just large enough for the guide portion 31 to pass through. In this way, when the battery cell 10 is charged and expands and applies external force to the buffer 22, because the buffer 22 is connected to the guide portion 31 through the first through hole 221, the buffer 22 can move smoothly and quickly along the first direction X, which can reduce the probability of the buffer 22 deviating from the preset route during the movement, and speed up the movement efficiency of the buffer 22.

[0083] like Figure 3 As shown, in some embodiments, the busbar 30 and the fixing member 21 are detachably connected.

[0084] The current collector 30 and the fixing member 21 may be connected by, but are not limited to, threaded connection or clamping connection.

[0085] Exemplarily, the fixing member 21 is provided with a plurality of threaded holes, and the collector 30 is provided with a plurality of threaded through holes, and bolts can pass through the threaded through holes and the threaded holes in sequence, thereby connecting the collector 30 and the fixing member 21 together.

[0086] When either the busbar 30 or the fixing member 21 is damaged, the damaged one can be replaced with a new one. Compared with replacing both the busbar 30 and the fixing member 21 , the maintenance cost of the battery module 100 can be reduced.

[0087] Please continue reading Figure 3 In some embodiments, the buffer member 22 includes an elastic connecting portion 222 and an abutting portion 223 , and the elastic connecting portion 222 is located between the abutting portion 223 and the fixing member 21 .

[0088] The elastic connection portion 222 may extend along the first direction X, and the contact portion 223 may be plate-shaped and extend along the second direction Y.

[0089] When the battery cell 10 expands during charging and contacts the abutment portion 223, the abutment portion 223 is plate-shaped, so the contact area between the battery cell 10 and the abutment portion 223 can be increased, and the difficulty of moving the abutment portion 223 can be reduced. When the battery cell 10 expands slightly, it can contact the abutment portion 223 to push the abutment portion 223 to move in a direction close to the fixing member 21, which can improve the mobility sensitivity of the abutment portion 223.

[0090] Specifically, in some embodiments, the elastic connection portion 222 includes a spring or a spring.

[0091] For example, in Figure 3 In the example shown, the elastic connection portion 222 includes a spring. One end of the spring is connected to the abutment portion 223, and the other end is connected to the fixing member 21. When the battery cell 10 expands and contacts the abutment portion 223, the abutment portion 223 can be pushed to move toward the fixing member 21 and can compress the spring, so that the spring is deformed and generates an elastic restoring force.

[0092] When the battery cell 10 switches from the expanded state to the unexpanded state, the abutment portion 223 can move in the reverse direction under the action of the elastic restoring force, that is, move in the direction away from the fixing member 21, thereby realizing automatic return, and the battery cell 10 can always be in a state of being constrained by the buffer member 22 without manual adjustment. In addition, the elastic connection portion 222 includes a spring or a spring sheet, which can reduce the difficulty of preparing the elastic connection portion 222 and the production cost.

[0093] It is understandable that when the elastic connection part 222 includes a spring, its working principle is similar to that of a spring, which will not be described in detail. The elastic force of the elastic connection part 222 can also be adjusted according to actual conditions to meet the requirements of the battery module 100.

[0094] In other embodiments, the spring, the abutment portion 223 and the fixing member 21 may be detachably connected. When at least one of the spring, the abutment portion 223 and the fixing member 21 is damaged, the damaged component can be replaced with a new component, which reduces the maintenance cost of the buffer mechanism 20 compared to replacing all three components.

[0095] More specifically, if Figure 3 As shown, in some embodiments, the fixing member 21, the abutting portion 223 and the elastic connecting portion 222 are combined to form an end plate structure.

[0096] Because the fixing member 21 and the busbar 30 are fixedly connected, and the busbar 30 is connected to the battery cell 10, the end plate structure formed by the fixing member 21, the abutment portion 223 and the elastic connection portion 222 can not only limit the movement distance of the battery cell 10 along the first direction X, but also protect the battery cell 10 to reduce the probability of the battery cell 10 escaping from the space and colliding with other components in the battery module 100, thereby causing damage to the battery cell 10.

[0097] See also Figure 4 In some embodiments, the busbar 30 includes a plurality of second through holes 32 and a plurality of power connection portions 33 , the plurality of second through holes 32 and the plurality of power connection portions 33 are cross-arranged along the first direction X, and the tabs 11 of the battery cell 10 are connected by passing through the second through holes 32 and the power connection portions 33 .

[0098] The shape of the second through hole 32 can be, but is not limited to, a rectangular hole or a waist-shaped hole. The power connection portion 33 can be made of metal materials such as aluminum bar.

[0099] The tab 11 of the battery cell 10 and the power connection portion 33 are arranged on the same side, which is convenient for the user to connect the tab 11 of the battery cell 10 and the power connection portion 33 together, and the second through hole 32 is convenient for installing the two.

[0100] Please continue reading Figure 4 Also see Figure 3 In some embodiments, an electrical connection portion 33 is provided between any two adjacent second through holes 32, and two adjacent battery cells 10 constitute a group. The pole ears 11 of the two battery cells 10 in each group respectively pass through the two adjacent second through holes 32 and are electrically connected to the same electrical connection portion 33, and the pole ears 11 of the two adjacent battery cells 10 between adjacent groups can pass through the same second through hole 32.

[0101] For example, Figure 3 As shown, a busbar 30 is provided on both sides of the battery cell 10 in the second direction Y, and the two pole ears 11 of each battery cell 10 are distributed on both sides of the battery cell 10 along the second direction Y. The pole ears 11 on the same side of the busbar 30 can pass through the second through hole 32 on the busbar 30 and be electrically connected to the power connection part 33 on the busbar 30.

[0102] Taking the pole tabs 11 and the power connection portion 33 on one side as an example, assuming that the number of battery cells 10 is four, two adjacent battery cells 10 form a group. The pole tabs 11 of each battery cell 10 in each battery cell 10 group are electrically connected to the same power connection portion 33 on the busbar 30. The pole tabs 11 of two adjacent battery cells 10 in two adjacent battery cell 10 groups can pass through the same second through hole 32 to reduce the number of second through holes 32, thereby reducing the volume of the busbar 30.

[0103] See also Figure 3 and Figure 5 In some embodiments, the tab 11 of each battery cell 10 passes through the second through hole 32 and is bent along the first direction X to be electrically connected to the power connection portion 33. Along the first direction X, the bending size of the tab 11 ranges from 3 mm to 4 mm.

[0104] like Figure 5 As shown, the bending dimension of the tab 11 can be understood as the extension length of the exposed portion of the tab 11 after passing through the second through hole 32 along the first direction X. The bending dimension of the tab 11 can be L1, and the value of L1 can be 3mm, 3.2mm, 3.3mm, 3.5mm, 4mm, and other values ​​between two adjacent values.

[0105] In each battery cell 10 group, the tabs 11 of all battery cells 10 at the same end in the second direction Y can be arranged opposite to each other. In other words, the bending directions of the tabs 11 of two battery cells 10 are opposite to each other. When two tabs 11 are overlapped with the same power connection part 33, the three can be welded. Because the tabs 11 are bent along the first direction X, the contact area between the tabs 11 and the power connection part 33 can be increased as much as possible, which can improve the connection stability between the two.

[0106] Furthermore, in some embodiments, Figure 3 As shown, the battery module 100 further includes a heat insulating member 40 , which is disposed between two adjacent battery cells 10 .

[0107] When the battery cells 10 are in operation, they generate heat, and a heat insulating member 40 is provided between two adjacent battery cells 10 to isolate the two adjacent battery cells 10. When thermal runaway occurs in one of the battery cells 10, its influence on the other battery cell 10 is reduced, so as to minimize the damage to the battery cells 10.

[0108] Furthermore, the heat insulating member 40 is bonded to one of the two adjacent battery cells 10. In this way, the heat insulating member 40 is easily installed, the installation speed of the heat insulating member 40 is accelerated, and the heat insulating member 40 can be repeatedly used.

[0109] The embodiment of the present application further provides a battery, which includes the battery module 100 in any of the above embodiments. For the battery module 100, please refer to the relevant contents recorded above, which will not be repeated here.

[0110] The busbar 30 in the battery can guide part of the buffer mechanism 20 to speed up the movement speed of the buffer mechanism 20 along the first direction X when the buffer mechanism 20 is subjected to an external force. When the buffer mechanism 20 moves under the push of the battery cell 10, the probability of deformation of the buffer mechanism 20 due to the external force applied by the battery cell 10 and damage to the battery cell 10 can be reduced.

[0111] Secondly, in addition to the function of collecting current, the collector 30 can also guide the part of the buffer mechanism 20 that can move along the first direction X. In this way, there is no need to set up additional guides, which reduces the number of components required in the battery module 100 and speeds up the assembly efficiency of the battery module 100.

[0112] In some embodiments, the battery is a pouch cell.

[0113] Power batteries can generally be divided into hard-shell batteries and soft-pack batteries. Compared with hard-shell batteries, soft-pack batteries have a thinner packaging shell, so the shape can be customized to bring higher energy density benefits. When the battery cell 10 of the soft-pack battery expands during charging, the busbar 30 and the buffer mechanism 20 of the battery module 100 can not only provide the battery cell 10 with an environment that meets its expansion force requirements, but also simplify the structure of the battery module 100 and speed up the assembly efficiency of the battery module 100.

[0114] Some embodiments of the present application further provide an electric device 1000. The electric device 1000 includes a battery in any of the above embodiments. For the battery, please refer to the relevant contents recorded above, which will not be repeated here.

[0115] The busbar 30 in the electrical device 1000 can guide part of the buffer mechanism 20 to speed up the movement of the buffer mechanism 20 along the first direction X when the buffer mechanism 20 is subjected to an external force. When the buffer mechanism 20 moves under the push of the battery cell 10, the probability of deformation of the buffer mechanism 20 due to the external force applied by the battery cell 10 and damage to the battery cell 10 can be reduced.

[0116] Secondly, in addition to the function of collecting current, the collector 30 can also guide the part of the buffer mechanism 20 that can move along the first direction X. In this way, there is no need to set up additional guides, which reduces the number of components required in the battery module 100 and speeds up the assembly efficiency of the battery module 100. Figure 4 In a specific embodiment, the battery module 100 includes a plurality of battery cells 10, two busbars 30 and two buffer mechanisms 20. The plurality of battery cells 10 are distributed along a first direction X, and a heat insulating member 40 is provided between two adjacent battery cells 10. In a second direction Y perpendicular to the first direction X, a busbar 30 is provided on both sides of the plurality of battery cells 10, respectively. The two buffer mechanisms 20 are provided at both ends of the plurality of battery cells 10 along the first direction X. Each buffer mechanism 20 includes a fixing member 21, an elastic connecting portion 222 and an abutting portion 223, and the elastic abutting portion 223 is provided between the fixing member 21 and the abutting portion 223. Each busbar 30 can be fixedly connected to the fixing member 21 by passing through the abutting portion 223, and each busbar 30 is provided with a plurality of second through holes 32 and a plurality of power connection portions 33, and the plurality of second through holes 32 and the plurality of power connection portions 33 are cross-distributed along the first direction X.

[0117] When the battery cell 10 expands during charging, it can contact the abutment portion 223 and apply external force to the abutment portion 223, so that the abutment portion 223 can move toward the fixing member 21 and squeeze the elastic connection portion 222 to deform the elastic connection portion 222 and generate elastic restoring force. When the battery cell 10 does not expand during discharging, the abutment portion 223 moves away from the fixing member 21 under the action of the elastic restoring force.

[0118] In this way, an expansion force environment can be provided for the battery cell 10 , reducing the probability that the battery cell 10 contacts the end plate formed by the buffer mechanism 20 during charging expansion, thereby causing deformation of the end plate or damage to the battery cell 10 .

[0119] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0120] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery module, characterized in that: include: A plurality of battery cells, wherein the plurality of battery cells are arranged along a first direction; a buffer mechanism, disposed at at least one end of the plurality of battery cells along the first direction; A busbar is provided on at least one side of the plurality of battery cells along a second direction, and a tab of each of the battery cells is connected to the busbar, and the second direction intersects the first direction; Wherein, the collector has a guide portion, and the guide portion is movably connected to a part of the buffer mechanism along the first direction.

2. The battery module according to claim 1, characterized in that: The buffer mechanism comprises a movably connected fixing member and a buffer member, wherein the buffer member is located between the fixing member and the battery cell, and the buffer member is movably connected to the guide portion of the current collector along the first direction, and the fixing member is fixedly connected to the current collector.

3. The battery module according to claim 2, characterized in that: The buffer component is provided with a first through hole, and the guide portion passes through the first through hole to be movably connected with the buffer component.

4. The battery module according to claim 3, characterized in that: The guide portion is a plate-shaped structure extending along the first direction, and the inner contour shape of the first through hole is matched with the outer contour shape of the guide portion.

5. The battery module according to claim 2, characterized in that: The current collector and the fixing member are detachably connected.

6. The battery module according to claim 2, characterized in that: The buffer member includes an elastic connecting portion and an abutting portion, and the elastic connecting portion is located between the abutting portion and the fixing member.

7. The battery module according to claim 1, characterized in that: The busbar comprises a plurality of second through holes and a plurality of power connection portions, the plurality of second through holes and the plurality of power connection portions are cross-arranged along the first direction, and the tabs of the battery cells are connected by passing through the second through holes and the power connection portions.

8. The battery module according to claim 7, characterized in that: An electrical connection portion is provided between any two adjacent second through holes, and two adjacent battery cells form a group. The pole tabs of the two battery cells in each group pass through two adjacent second through holes respectively and are electrically connected to the same electrical connection portion, and the pole tabs of two adjacent battery cells between adjacent groups can pass through the same second through hole.

9. The battery module according to claim 8, characterized in that: The pole tab of each battery cell passes through the second through hole and is bent along the first direction to be electrically connected to the power connection portion. Along the first direction, the bending size of the pole tab ranges from 3 mm to 4 mm.

10. The battery module according to claim 1, characterized in that: The battery module further includes a heat insulating member, and the heat insulating member is arranged between two adjacent battery cells.

11. The battery module according to claim 10, characterized in that: The heat insulating member is bonded to one of two adjacent battery cells.

12. A battery, characterized in that: The battery comprises a battery module as claimed in any one of claims 1 to 11.

13. An electrical device, characterized in that: Comprising the battery of claim 12.

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