Battery module

Abstract

The invention discloses a battery module, and belongs to the technical field of batteries, the battery module comprises a confluence assembly and a plurality of battery cells, each battery cell comprises a main body part and a target tab, the confluence assembly comprises a confluence piece, the target tab is provided with a first connecting part, a second connecting part and a tearing part, the first connecting part is connected to the confluence piece, and the second connecting part is connected to the tearing part. The second connecting part is connected to the main body part, and the tearing part is configured to be disconnected after the battery cell expands to a preset value, so that the first connecting part and the second connecting part are electrically disconnected; according to the battery module, the tearing part is arranged on the target tab, and the tearing part is disconnected after the battery cell expands to the preset value, so that the electrical connection between the battery cell and the convergence assembly is disconnected, the battery cell can be effectively protected at the initial stage of thermal runaway, and the safety performance of the battery module is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery module. Background Technology

[0002] Battery pack assembly refers to combining multiple battery cells in series and / or in parallel through a busbar assembly to form a battery pack with a larger capacity. The battery pack is then placed in a module frame of the corresponding size to form a battery module.

[0003] In related technologies, to improve the safety performance of battery modules, a fuse is usually installed between the tabs and the busbar, and the electrical connection between the tabs and the busbar is severed by the melting of the fuse. However, because the temperature required for the fuse to reach its melting point is relatively high, the battery cell cannot be effectively protected in the early stages of thermal runaway (such as when the battery cell expands), thus reducing the safety performance of the battery module. Summary of the Invention

[0004] One of the objectives of this application is to provide a battery module that improves safety performance, thereby at least partially solving the aforementioned technical problems.

[0005] To achieve the above objectives, this application provides a battery module, comprising: Multiple battery cells, each including a main body and a target electrode tab; Busbar components, including busbar parts; The target electrode has a first connecting part, a second connecting part, and a tearing part. The first connecting part is connected to the busbar, the second connecting part is connected to the main body, and the tearing part is configured to disconnect after the cell expands to a preset value, so as to disconnect the electrical connection between the first connecting part and the second connecting part.

[0006] Optionally, the battery module includes at least one deformable element located on the side of the main body away from the busbar along a first direction. The deformable element is configured to be compressed when the cell expands, so that the second connection portion moves away from the first connection portion along the first direction.

[0007] Optionally, the battery module includes at least one limiting member, the limiting member and the bus member are located on the same side of the main body along the first direction, and the limiting member is configured to restrict the second connection portion from moving toward the first connection portion along the first direction when the cell expands.

[0008] Optionally, the battery module includes a first battery cell and a second battery cell. The first battery cell includes a first positive tab and a first negative tab, and the second battery cell includes a second positive tab and a second negative tab. The busbar assembly includes a first busbar and a second busbar. The first busbar is connected to the first negative tab, and the second busbar connects the first positive tab and the second negative tab. The first negative electrode tab is configured as the target electrode tab; or... Both the first and second negative electrodes are configured as target electrodes.

[0009] Optionally, the battery module includes a first cell and a second cell, with a deformation member located between the first cell and the second cell, and a limiting member located on the side of the first cell away from the second cell.

[0010] Optionally, the battery module includes a first cell, a second cell, a first deformable element, a second deformable element, a first limiting element, and a second limiting element. The first deformable element and the second limiting element are located between the first cell and the second cell. The second deformable element is located on the side of the second cell away from the first cell, and the first limiting element is located on the side of the first cell away from the second cell.

[0011] Optionally, the first battery cell has a first main body portion, the second battery cell has a second main body portion, the first deforming member and the first limiting member are located on both sides of the first main body portion along the first direction, the second deforming member and the second limiting member are located on both sides of the second main body portion along the first direction, the first deforming member and the second limiting member are arranged opposite to each other along the second direction, and the second direction intersects the first direction.

[0012] Optionally, the battery module also includes a connector that connects the first deformable member and the second limiting member, the first deformable member and the second limiting member being located on both sides of the connector along the second direction.

[0013] Optionally, the tear portion is configured as a groove provided on the target tab, the groove having a groove depth dimension along the second direction, the target tab having a wall thickness dimension along the second direction, and the ratio of the groove depth dimension to the wall thickness dimension being between 40% and 70%. The first connecting part has a first dimension along the first direction, and the second connecting part has a second dimension along the first direction, wherein the first dimension is not smaller than the second dimension.

[0014] Optionally, the first main body includes a first aluminum-plastic film, the second main body includes a second aluminum-plastic film, and the busbar assembly further includes an isolation member connected to the busbar. The isolation member has a protrusion located between the first aluminum-plastic film and the second aluminum-plastic film. The protrusion and the first aluminum-plastic film have a first distance along a first direction, and the protrusion and the second aluminum-plastic film have a second distance along the first direction. The first distance is not less than the second distance.

[0015] In the battery module of this application embodiment, by providing a tear on the target tab, the tear breaks after the cell expands to a preset value, thereby disconnecting the electrical connection between the cell and the busbar assembly, so that the cell can be effectively protected in the early stage of thermal runaway, thus improving the safety performance of the battery module. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0017] Figure 1 This is a partial structural diagram of a battery module in one exemplary embodiment of this disclosure; Figure 2 yes Figure 1 A three-dimensional schematic diagram of the cross-sectional view at point AA; Figure 3 yes Figure 1 Exploded view of the battery module; Figure 4 yes Figure 1 A schematic plan view of the cross-section at point AA; Figure 5 This is a partial structural diagram of a battery module in another exemplary embodiment of this disclosure; Figure 6 yes Figure 5 An exploded view of the battery module.

[0018] Explanation of reference numerals in the attached figures: 1. Battery cell; 11. Main body; 12. Target electrode tab; 121. First connecting part; 122. Second connecting part; 123. Tear part; 124. Score groove; 13. First battery cell; 131. First positive electrode tab; 132. First negative electrode tab; 133. First main body; 134. First aluminum-plastic film; 14. Second battery cell; 141. Second positive electrode tab; 142. Second negative electrode tab; 143. Second main body; 144. Second aluminum-plastic film; 2. Busbar assembly; 21. Busbar component; 22. First busbar component; 23. Second busbar component; 24. Isolator; 241. Protrusion; 3. Deformation component; 31. First deformation component; 32. Second deformation component; 4. Limiting component; 41. First limiting component; 42. Second limiting component; 5. Connectors; D1, groove depth; D2, wall thickness; D3, first dimension; D4, second dimension; D5, first spacing; D6, second spacing; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0020] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0021] It should be understood that terms such as "upper," "lower," "outer," and "inner," used herein to indicate spatial relative position, are for illustrative purposes to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. The terms "spatial relative position" may be intended to include different orientations of the equipment in use or operation other than those shown in the figures.

[0022] Please see Figure 1 This application provides a battery module, including a busbar assembly 2 and multiple battery cells 1.

[0023] In this embodiment, multiple battery cells 1 are electrically connected using a busbar assembly 2, for example, by connecting multiple battery cells 1 in series or in parallel.

[0024] In some embodiments, the battery cell 1 includes a main body 11 and a target electrode 12.

[0025] In this embodiment, the target tab 12 is located on one side of the main body 11 in the length or width direction.

[0026] For example, cell 1 can be a pouch cell.

[0027] In some embodiments, the bus assembly 2 includes a bus member 21.

[0028] In this embodiment, the target electrode 12 is electrically connected to the busbar 21.

[0029] In some embodiments, in conjunction with reference Figure 2 As shown, the target tab 12 has a first connecting portion 121, a second connecting portion 122, and a tear portion 123.

[0030] In this embodiment, a target electrode tab 12 is formed by providing a tear 123 on the positive or negative electrode tab of the battery cell 1.

[0031] In some embodiments, the first connection portion 121 is connected to the busbar 21.

[0032] In this embodiment, the busbar 21 is welded to the first connecting part 121, thereby realizing the electrical connection between the busbar 21 and the first connecting part 121.

[0033] In some embodiments, the second connecting portion 122 is connected to the main body portion 11.

[0034] In this embodiment, the second connecting part 122 and the main body part 11 are integrally formed, for example, by bending forming.

[0035] In some embodiments, the tear 123 is configured to break after the cell 1 expands to a preset value, thereby breaking the electrical connection between the first connection 121 and the second connection 122.

[0036] In this embodiment, when the battery cell 1 has not expanded or the expansion of the battery cell 1 has not reached the preset value, the tear portion 123 connects the first connecting portion 121 and the second connecting portion 122 together.

[0037] In this embodiment, the first connecting part 121 is electrically connected to the busbar 21, and the second connecting part 122 is electrically connected to the main body 11. When the first connecting part 121 and the second connecting part 122 are disconnected (i.e., after the tear part 123 is disconnected), the busbar 21 and the main body 11 are disconnected from the electrical connection.

[0038] In this embodiment, the tear section 123 is disconnected when the battery cell 1 expands to a preset value, which can ensure that the battery cell 1 is disconnected when it expands with gas but has not reached the ignition condition, thus preventing the battery cell 1 from continuing to overcurrent or even igniting, and avoiding the occurrence of fire and explosion at the battery cell level.

[0039] For example, when cell 1 is overcharged, over-discharged, subjected to high temperature, aged, or subjected to external impact, short circuits may occur, causing heat generation, temperature rise, and electrolyte gas generation, resulting in cell 1 expanding. Once cell 1 expands to a preset value, it may lead to serious safety risks and hazards such as combustion and fire. Disconnecting the electrical connection between the target electrode 12 and the busbar 21 after the expansion reaches the preset value can effectively reduce risks and hazards and achieve cell-level protection.

[0040] For example, the preset value of the expansion of the cell 1 is adapted to the relative displacement between the first connecting part 121 and the second connecting part 122 when the tear 123 is disconnected.

[0041] In some embodiments, in conjunction with reference Figure 3 As shown, the battery module includes at least one deformable element 3.

[0042] In this embodiment, when the battery module includes two cells 1, the number of deformation elements 3 can be one or two. As the number of cells 1 increases, the number of deformation elements 3 increases accordingly.

[0043] In some embodiments, continue to refer to Figure 2 As shown, the deformable part 3 is located on the side of the main body 11 opposite to the busbar 21 along the first direction X.

[0044] In this embodiment, the target electrode 12 is formed by bending and protrudes from one side of the main body 11 along the first direction X, for example, protruding from the side of the main body 11 away from the deformable member 3 along the first direction X, thereby realizing the docking between the target electrode 12 and the busbar 21.

[0045] In some embodiments, the deformable member 3 is configured to be compressed when the cell 1 expands, so that the second connection portion 122 moves away from the first connection portion 121 along the first direction X.

[0046] In this embodiment, by providing a tear 123 on the target tab 12, the tear 123 breaks after the cell 1 expands to a preset value, thereby disconnecting the electrical connection between the cell 1 and the busbar assembly 2, so that the cell 1 can be effectively protected in the early stage of thermal runaway, thus improving the safety performance of the battery module.

[0047] In this embodiment, when the battery cell 1 expands, the deformable element 3 can be compressed (for example, compressed along the first direction X), causing the main body 11 to drive the second connecting part 122 to move towards the deformable element 3 along the first direction X, thereby causing the second connecting part 122 to move away from the first connecting part 121. Since the first connecting part 121 is connected to the busbar 21 and remains stationary, when the second connecting part 122 moves towards the deformable element 3 along the first direction X, the tear 123 between the first connecting part 121 and the second connecting part 122 can be broken, thus severing the electrical connection between the first connecting part 121 and the second connecting part 122.

[0048] For example, the deformable part 3 can be connected to the main body 11 by adhesive bonding.

[0049] For example, the material of the deformable component 3 can be microcellular polypropylene foam (MPP), with a foaming ratio of up to 30 times. Microcellular polypropylene foam is prepared using supercritical carbon dioxide foaming technology and possesses both rigidity and toughness.

[0050] In some embodiments, continue to refer to Figure 3 As shown, the battery module includes at least one limiting member 4.

[0051] In this embodiment, when the battery module includes two battery cells 1, the number of limiting members 4 can be one or two. As the number of battery cells 1 increases, the number of limiting members 4 increases accordingly.

[0052] For example, the number of limiting members 4 corresponds one-to-one with the number of deformable members 3.

[0053] In some embodiments, continue to refer to Figure 2 As shown, the limiting member 4 and the busbar 21 are located on the same side of the main body 11 along the first direction X.

[0054] In this embodiment, the limiting member 4 and the busbar 21 are located on one side of the main body 11 along the first direction X, and the deformable member 3 is located on the opposite side of the main body 11 along the first direction X.

[0055] In some embodiments, the limiting member 4 is configured to restrict the second connection portion 122 from moving toward the first connection portion 121 along the first direction X when the cell 1 expands.

[0056] In this embodiment, the limiting member 4 supports the main body 11 along the first direction X toward the busbar 21, preventing the main body 11 from moving the second connecting part 122 toward the busbar 21 (i.e. the first connecting part 121) when the cell 1 expands. This ensures that the displacement of the second connecting part 122 caused by the expansion of the cell 1 can only be toward the deformable member 3, thus realizing the unidirectional displacement of the second connecting part 122. That is, the second connecting part 122 can only move away from the first connecting part 121, which is beneficial for breaking the tear part 123.

[0057] For example, the limiting member 4 can be attached to the main body 11 by adhesive bonding.

[0058] For example, the limiting member 4 can be made of epoxy resin, which can provide sufficient support during the expansion of the battery cell 1 and is not easily compressed or deformed.

[0059] In some embodiments, in conjunction with reference Figure 4 As shown, the tear 123 is configured as a groove 124 provided on the target tab 12.

[0060] In this embodiment, the groove 124 is recessed into the end face of the target tab 12, making the groove 124 easily torn and broken. The first connecting portion 121 and the second connecting portion 122 are located on both sides of the groove 124.

[0061] In this embodiment, the groove 124 can be a recessed structure laser-engraved, and the cross-sectional shape of the groove 124 can be "V" shaped.

[0062] In some embodiments, the groove 124 has a groove depth dimension D1 along the second direction Y, the target tab 12 has a wall thickness dimension D2 along the second direction Y, and the ratio of the groove depth dimension D1 to the wall thickness dimension D2 is between 40% and 70%.

[0063] In this embodiment, the ratio of groove depth dimension D1 to wall thickness dimension D2 is greater than 40%, which can prevent the groove depth of the scoring groove 124 from being too large and affecting the strength and conductivity of the target electrode 12.

[0064] In this embodiment, the ratio of groove depth dimension D1 to wall thickness dimension D2 is less than 70%, which can prevent the groove depth of the scoring groove 124 from being too small, making it difficult for the tear portion 123 to be pulled off.

[0065] For example, the groove depth dimension D1 is more than half of the wall thickness dimension D2. For instance, the ratio of the groove depth dimension D1 to the wall thickness dimension D2 is between 50% and 60%, and the ratio can be 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, etc. This prevents the tear portion 123 from breaking too easily. When the battery cell 1 produces gas after charge-discharge cycles, slight bulging is normal. At this time, the tear portion 123 can ensure that it is not easily broken in cases of slight bulging (i.e., the thickness increase caused by the expansion of the battery cell 1 is small), but is easily broken in cases of moderate to severe bulging (i.e., the thickness increase caused by the expansion of the battery cell 1 is large).

[0066] In some embodiments, in conjunction with reference Figure 4 As shown, the first connecting portion 121 has a first dimension D3 along the first direction X, and the second connecting portion 122 has a second dimension D4 along the first direction X, wherein the first dimension D3 is not less than the second dimension D4.

[0067] In this embodiment, when the first dimension D3 is greater than the second dimension D4, it can prevent the groove 124 from being too close to the busbar 21, thus affecting the connection strength (e.g., welding strength) between the busbar 21 and the target electrode 12.

[0068] In this embodiment, when the busbar 21 is welded to the first connecting part 121, if the groove 124 is too close to the busbar 21, that is, the first dimension D3 is too small, it will lead to a decrease in mechanical properties or uneven heating leading to explosions and other adverse phenomena. The first dimension D3 is larger than the second dimension D4, which can leave enough space for welding, avoid the busbar 21 being too close to the groove 124 during welding, and ensure the welding strength.

[0069] In this embodiment, the first connecting portion 121 and the second connecting portion 122 are located on both sides of the tear portion 123 along the first direction X. The first dimension D3 can be twice the second dimension D4, that is, the tear portion 123 is located at two-thirds of the distance from the target electrode tab 12 along the first direction X. This avoids the scoring groove 124 being too close to the connection between the target electrode tab 12 and the main body portion 11, thus preventing the second dimension D4 from being too small and affecting the strength of the target electrode tab 12.

[0070] For example, during the manufacturing of the battery cell 1, the groove 124 is processed first, and then the target tab 12 is bent, which facilitates the formation of the groove 124 on the tab of the planar structure. In addition, by avoiding the groove being too close to the connection between the target tab 12 and the main body 11 (i.e., the second dimension D4 being too small), stress concentration or deformation of the groove 124 can be avoided, thus ensuring the strength of the target tab 12.

[0071] In some embodiments, in conjunction with reference Figure 1 , Figure 3 , Figure 5 and Figure 6 As shown, the battery module includes a first battery cell 13 and a second battery cell 14. The first battery cell 13 includes a first positive electrode tab 131 and a first negative electrode tab 132, and the second battery cell 14 includes a second positive electrode tab 141 and a second negative electrode tab 142.

[0072] In some embodiments, the bus assembly 2 includes a first bus 22 and a second bus 23.

[0073] In some embodiments, the first busbar 22 is connected to the first negative tab 132, and the second busbar 23 connects the first positive tab 131 to the second negative tab 142.

[0074] In this embodiment, adjacent cells 1 are connected in series, that is, the first cell 13 and the second cell 14 are connected in series.

[0075] In some embodiments, continue to refer to Figure 1 and Figure 3 As shown, the first negative electrode tab 132 is configured as the target electrode tab 12.

[0076] In this embodiment, only one target tab 12 is set between two adjacent cells 1, that is, the first negative tab 132 is configured as the target tab 12. The circuit is broken by the first negative tab 132 after the first cell 13 expands, which can reduce the manufacturing cost of the battery module.

[0077] In some embodiments, continue to refer to Figure 5 and Figure 6 As shown, both the first negative electrode tab 132 and the second negative electrode tab 142 are configured as target tabs 12.

[0078] In this embodiment, target tabs 12 are provided for two adjacent cells 1, that is, the first negative tab 132 and the second negative tab 142 are both configured as target tabs 12, so that the negative tab can be disconnected after each cell 1 expands to achieve circuit breaking. Each cell 1 can achieve cell-level protection and improve the safety of the battery module.

[0079] In this embodiment, adjacent battery cells 1 (i.e., between the first battery cell 13 and the second battery cell 14) are connected in series, and at least one negative electrode tab is used as the target electrode tab 12. The current direction is from the positive electrode tab to the negative electrode tab. After the first negative electrode tab 132 is disconnected, the first positive electrode tab 131 of the first battery cell 13 can no longer flow to the second negative electrode tab 142 of the second battery cell 14, which can protect the second battery cell 14 and avoid the accumulation of internal charge in the second battery cell 14, which may cause sparks or other risks. Thus, disconnecting the negative electrode tab can disconnect the circuit more quickly and effectively.

[0080] In this embodiment, only the negative electrode tab adopts the target electrode tab 12, which can play a foolproof role during assembly for a single battery cell 1 and reduce the manufacturing cost of the battery cell 1.

[0081] In some embodiments, continue to refer to Figure 1 and Figure 3 As shown, the deformation member 3 is located between the first battery cell 13 and the second battery cell 14, and the limiting member 4 is located on the side of the first battery cell 13 away from the second battery cell 14.

[0082] In this embodiment, only one deformation element 3 or one limiting element 4 is provided between adjacent cells 1, which simplifies the structure of the battery module and reduces manufacturing costs.

[0083] In some embodiments, continue to refer to Figure 5 and Figure 6 As shown, the battery module includes a first deformable component 31, a second deformable component 32, a first limiting component 41, and a second limiting component 42.

[0084] In some embodiments, the first deforming member 31 and the second limiting member 42 are located between the first battery cell 13 and the second battery cell 14.

[0085] In this embodiment, a deformation element 3 is provided between each two adjacent battery cells 1 to meet the displacement requirements of the second connecting portion 122 within the two target tabs 12 (i.e., the first negative tab 132 and the second negative tab 142). That is, each second connecting portion 122 will move when the battery cell 1 expands, thereby breaking the tear portion 123, so that each battery cell 1 can achieve circuit breaking.

[0086] In some embodiments, the second deformation member 32 is located on the side of the second cell 14 away from the first cell 13, and the first limiting member 41 is located on the side of the first cell 13 away from the second cell 14.

[0087] In this embodiment, a limiting member 4 is provided between each two adjacent battery cells 1 to satisfy the unidirectional displacement requirement of the second connecting portion 122 within the two target tabs 12 (i.e., the first negative tab 132 and the second negative tab 142). That is, when the battery cell 1 expands, the second connecting portion 122 can only be displaced in the direction away from the first connecting portion 121.

[0088] In some embodiments, continue to refer to Figure 5 and Figure 6 As shown, the first battery cell 13 has a first main body portion 133, and the second battery cell 14 has a second main body portion 143.

[0089] In some embodiments, the first deformable member 31 and the first limiting member 41 are located on both sides of the first main body portion 133 along the first direction X.

[0090] In some embodiments, the second deformable member 32 and the second limiting member 42 are located on both sides of the second main body portion 143 along the first direction X.

[0091] In this embodiment, the first deformable member 31 is located on the side of the first main body 133 opposite to the first negative electrode tab 132. The second deformable member 32 is located on the side of the second main body 143 opposite to the second negative electrode tab 142.

[0092] For example, the first limiting member 41 and the first negative electrode tab 132 are located on one side of the first main body portion 133 along the second direction Y, and the second limiting member 42 and the second negative electrode tab 142 are located on the opposite side of the first main body portion 133 along the second direction Y.

[0093] In some embodiments, the first deformable member 31 and the second limiting member 42 are disposed opposite each other along the second direction Y.

[0094] In this embodiment, the first deformable member 31 and the first limiting member 41 are arranged along the first direction X, and the second deformable member 32 and the second limiting member 42 are arranged along the first direction X. The first negative electrode tab 132 and the second negative electrode tab 142 are arranged along the second direction Y, and the first deformable member 31 and the second limiting member 42 are arranged along the second direction Y. This saves space occupied by the battery module along the third direction Z.

[0095] For example, the first negative electrode tab 132 and the first deformable member 31 are located on one side of the first main body portion 133 along the second direction Y, and the second negative electrode tab 142 and the second limiting member 42 are located on the opposite side of the first main body portion 133 along the second direction Y.

[0096] In some embodiments, the second direction Y intersects with the first direction X.

[0097] In this embodiment, the first direction X can be the thickness direction of the cell 1. The second direction Y can be the length direction of the cell 1, which can save the space occupied by the battery module along the width direction of the cell 1. The second direction Y can also be the width direction of the cell 1, which can save the space occupied by the battery module along the length direction of the cell 1.

[0098] For example, such as Figure 5The first direction X can be the thickness direction of cell 1, the second direction Y can be the length direction of cell 1, and the third direction Z can be the width direction of cell 1.

[0099] In some embodiments, continue to refer to Figure 5 and Figure 6 As shown, the battery module also includes a connector 5.

[0100] For example, connector 5 can be a functional tape made of polyethylene terephthalate (PET) film as substrate and coated with acrylic adhesive on both sides, which has excellent dimensional stability, thermal stability and chemical stability.

[0101] In some embodiments, the connector 5 connects the first deformable member 31 to the second limiting member 42.

[0102] In this embodiment, the connector 5 bonds the first deformable member 31 and the second limiting member 42 together, such that the first limiting member 41 and the first deformable member are arranged along the second direction Y and spaced apart from each other. The connector 5 can fix the first deformable member 31 and the second limiting member 42, avoid relative displacement, and ensure the stability of the battery module operation. The connector 5 can also be bonded to the battery cell 1, which facilitates the assembly of the battery module.

[0103] In some embodiments, the first deformable member 31 and the second limiting member 42 are located on both sides of the connector 5 along the second direction Y.

[0104] In this embodiment, the connector 5 is located at the middle position of the cell 1 along the second direction Y. After the first deforming member 31 and the second limiting member 42 are connected by the connector 5, the second limiting member 42 can be moved away from the middle position of the cell 1, which is conducive to the second connecting part 122 of the target electrode 12 (i.e. the second negative electrode 142) being displaced towards the second deforming member 32 and the tearing part 123 is broken.

[0105] In this embodiment, when the battery cell 1 expands, it will start expanding from the middle position along the second direction Y. When the second limiting member 42 moves away from the middle position of the battery cell 1, it can prevent the second limiting member 42 from abutting the expanded part at the middle position of the battery cell 1, thereby preventing the second connecting part 122 of the second negative electrode tab 142 from moving toward the second busbar 23 (e.g., deflecting), so as to ensure that the second connecting part 122 of the second negative electrode tab 142 is displaced toward the side of the second deforming member 32, thereby achieving the tearing of the tear 123.

[0106] In some embodiments, continue to refer to Figure 3 , Figure 5 and Figure 6As shown, the first main body 133 includes a first aluminum-plastic film 134, and the second main body 143 includes a second aluminum-plastic film 144.

[0107] In some embodiments, the bus assembly 2 further includes an isolation member 24 connected to the bus 21.

[0108] In this embodiment, the isolation member 24 and the busbar 21 can be connected by a snap-fit ​​connection.

[0109] For example, the material of the separator 24 is an insulating material, such as a mixture of polycarbonate (PC) and acrylonitrile-butadiene-styrene copolymer (ABS), which combines the high strength, heat resistance, impact resistance and dimensional stability of PC with the processability, flowability and cost advantages of ABS.

[0110] In some embodiments, continue to refer to Figure 4 The separator 24 has a protrusion 241 located between the first aluminum-plastic film 134 and the second aluminum-plastic film 144.

[0111] In some embodiments, the protrusion 241 and the first aluminum-plastic film 134 have a first distance D5 along the first direction X, and the protrusion 241 and the second aluminum-plastic film 144 have a second distance D6 along the first direction X, wherein the first distance D5 is not less than the second distance D6.

[0112] In this embodiment, the protrusion 241 and the first aluminum-plastic film 134 are spaced apart from each other and have a first gap D5, so that when the second connecting part 122 moves away from the first connecting part 121, the protrusion 241 can avoid interfering with the second connecting part 122.

[0113] In this embodiment, the second spacing D6 is small, which can support the second aluminum-plastic film 144 on one side along the first direction X, so that the second cell 14 can only move in the direction away from the first cell 13 when it expands.

[0114] For example, when both the first battery cell 13 and the second battery cell 14 expand, the first aluminum-plastic film 134 and the second aluminum-plastic film 144 expand and move in the same direction. That is, the second connecting part 122 of all target tabs 12 are displaced in the same direction and the tear part 123 is broken, so as to avoid mutual interference between different target tabs 12.

[0115] For example, a first positive electrode tab 131 and a second positive electrode tab 141 protrude from opposite sides of a first aluminum-plastic film 134 along a first direction X. The first positive electrode tab 131 and the second negative electrode tab 142 are located on one side of the first aluminum-plastic film 134 along a second direction Y, and the first negative electrode tab 132 and the second positive electrode tab 141 are located on opposite sides of the first aluminum-plastic film 134 along the second direction Y. The first aluminum-plastic film 134 and the second aluminum-plastic film 144 are arranged along the first direction X.

[0116] In the description 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0117] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0118] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0119] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A battery module, characterized in that, include: Multiple battery cells, each battery cell including a main body and a target electrode tab; Busbar components, including busbar parts; The target electrode has a first connecting part, a second connecting part, and a tearing part. The first connecting part is connected to the busbar, the second connecting part is connected to the main body, and the tearing part is configured to disconnect after the battery cell expands to a preset value, so as to disconnect the electrical connection between the first connecting part and the second connecting part.

2. The battery module as described in claim 1, characterized in that, The battery module includes at least one deformation member located on the side of the main body away from the busbar along a first direction. The deformation member is configured to be compressed when the battery cell expands, so that the second connection portion moves away from the first connection portion along the first direction.

3. The battery module as described in claim 2, characterized in that, The battery module includes at least one limiting member, the limiting member and the bus member are located on the same side of the main body along the first direction, and the limiting member is configured to restrict the second connection portion from moving toward the first connection portion along the first direction when the battery cell expands.

4. The battery module as described in claim 1, characterized in that, The battery module includes a first battery cell and a second battery cell. The first battery cell includes a first positive electrode and a first negative electrode, and the second battery cell includes a second positive electrode and a second negative electrode. The current-combining assembly includes a first current-combining component and a second current-combining component. The first current-combining component is connected to the first negative electrode, and the second current-combining component connects the first positive electrode and the second negative electrode. The first negative electrode tab is configured as the target electrode tab; or... Both the first negative electrode tab and the second negative electrode tab are configured as the target electrode tab.

5. The battery module as described in claim 3, characterized in that, The battery module includes a first cell and a second cell, the deformation member is located between the first cell and the second cell, and the limiting member is located on the side of the first cell away from the second cell.

6. The battery module as described in claim 2, characterized in that, The battery module includes a first cell, a second cell, a first deformation component, a second deformation component, a first limiting component, and a second limiting component. The first deformation component and the second limiting component are located between the first cell and the second cell. The second deformation component is located on the side of the second cell away from the first cell, and the first limiting component is located on the side of the first cell away from the second cell.

7. The battery module as described in claim 6, characterized in that, The first battery cell has a first main body portion, the second battery cell has a second main body portion, the first deformation member and the first limiting member are located on both sides of the first main body portion along the first direction, the second deformation member and the second limiting member are located on both sides of the second main body portion along the first direction, the first deformation member and the second limiting member are disposed opposite to each other along a second direction, and the second direction intersects with the first direction.

8. The battery module as described in claim 7, characterized in that, The battery module further includes a connector that connects the first deformable member and the second limiting member, with the first deformable member and the second limiting member located on both sides of the connector along the second direction.

9. The battery module as described in claim 1, characterized in that, The tear portion is configured as a groove provided on the target tab, the groove having a groove depth dimension along a second direction, the target tab having a wall thickness dimension along the second direction, and the ratio of the groove depth dimension to the wall thickness dimension being between 40% and 70%. The first connecting portion has a first dimension along a first direction, and the second connecting portion has a second dimension along the first direction, wherein the first dimension is not smaller than the second dimension.

10. The battery module as described in claim 7, characterized in that, The first main body includes a first aluminum-plastic film, the second main body includes a second aluminum-plastic film, and the busbar assembly further includes an isolating member connected to the busbar assembly. The isolating member has a protrusion located between the first aluminum-plastic film and the second aluminum-plastic film. The protrusion and the first aluminum-plastic film have a first distance along the first direction, and the protrusion and the second aluminum-plastic film have a second distance along the first direction. The first distance is not less than the second distance.

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