Battery cell device and battery pack

Abstract

The utility model relates to a battery cell device and a battery pack. The battery cell device comprises a battery cell, the battery cell comprises a pole column structure, a first insulating part, a cover plate, a second insulating part and a fixing block which are sequentially stacked in the first direction, pole plates of the pole column structure are stacked on the first insulating part, pole columns of the pole column structure penetrate through the first insulating part, the cover plate and the second insulating part, and the pole columns are fixed to the fixing block; the cover plate is provided with a first connecting area, and the first connecting area and the fixing block are arranged in the second direction intersecting with the first direction. The fixing block is provided with a second connecting area; one part of the conductive part can be attached to the first connecting area, and the other part of the conductive part can be attached to the second connecting area, so that the fixing block is electrically connected to the cover plate through the conductive part; and the conductive part is detachably connected to the first connecting area or the second connecting area through the magnet. The battery cell device is safe to use.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery safety protection, and in particular to a battery cell device and a battery pack. Background Art

[0002] The shell of the battery cell is used to protect the internal structure of the battery cell, so it is expected that the shell itself will remain in good condition to avoid damage and failure.

[0003] During the manufacturing, storage, and transportation of battery cells, the shell is at risk of electrochemical corrosion. One way to prevent electrochemical corrosion is to connect the shell to the positive electrode of the battery cell to have a high potential level, thereby avoiding electrochemical corrosion.

[0004] However, after the battery cells are assembled into a battery pack, if the battery cells accidentally thermally run away and the outer insulating film is damaged, it will cause high-voltage arcing between the shell and the battery pack box, which may further cause the entire battery pack to thermally run away. Utility Model Content

[0005] Based on this, it is necessary to provide battery cell devices and battery packs to address the issue of safe use of battery cells.

[0006] An embodiment of the present disclosure provides a battery cell device, which includes: a battery cell, the battery cell including a pole structure, a first insulating member, a cover plate, a second insulating member and a fixed block stacked in sequence along a first direction, the pole plate of the pole structure is stacked on the first insulating member, the pole of the pole structure passes through the first insulating member, the cover plate and the second insulating member, and the pole is fixed to the fixed block; the cover plate has a first connection area, the first connection area and the fixed block are arranged along a second direction intersecting the first direction; the fixed block has a second connection area; a conductive member, a part of the first conductive member can be attached to the first connection area, and another part of the conductive member can be attached to the second connection area, so that the fixed block is electrically connected to the cover plate through the conductive member; and a magnet, the conductive member can be detachably connected to the first connection area or the second connection area through the magnet.

[0007] By providing removable conductive parts in the battery cells, the conductive parts can be installed during the manufacturing, transportation, or storage processes. The conductive parts charge the cover plate to prevent electrochemical corrosion. The conductive parts can also be removed when the battery cells are in use, avoiding the risk of high-voltage arcing on the cover plate. In addition, when the conductive parts are installed in the battery cells, the cover plate and the positive electrode are at the same potential. If the battery cell housing and the negative electrode are accidentally short-circuited, the battery cell assembly can avoid excessive current generation and thermal runaway of the battery cell. The battery cell assembly provided by the embodiments of the present disclosure is safe to use.

[0008] In some embodiments, the multiple magnets of the battery core device include at least one first magnet fixed to the first connection area and at least one second magnet fixed to the second connection area; the corresponding first magnet and the corresponding second magnet of the conductive member are both ferromagnetic parts.

[0009] With this arrangement, the magnet can be reliably fixed, while the conductive member has a simple structure and low cost.

[0010] In some embodiments, the first connection area is provided with two first magnets, which are spaced apart along a third direction and respectively located at the edge of the first connection area, and the third direction is perpendicular to the first direction and perpendicular to the second direction; the second connection area is provided with two second magnets, which are spaced apart along the third direction and respectively located at the edge of the second connection area.

[0011] Such a setting helps to prevent the edges from warping and can effectively absorb the conductive parts.

[0012] Exemplarily, the conductive member includes a first conductive portion, a second conductive portion, and a third conductive portion connected in sequence for attaching to the first connection area.

[0013] With this arrangement, the shape of the conductive member can be flexibly configured to adapt to different battery cell designs.

[0014] In some embodiments, the extension direction of the second conductive portion is inclined relative to the first direction; along the first direction, the angle between the outer side surface of the second conductive portion and the outer side surface of the first conductive portion is greater than 90°, and the angle between the inner side surface of the second conductive portion and the inner side surface of the third conductive portion is greater than 90°.

[0015] This arrangement helps ensure the elastic deformation capability of the conductive member, thereby ensuring that the first conductive portion and the third conductive portion are tightly attached to the battery cell. In addition, it also facilitates the removal of the conductive member.

[0016] In some embodiments, the conductive member is a conductive sheet, the second conductive portion is thinner than the first conductive portion, and the second conductive portion is thinner than the third conductive portion.

[0017] With this arrangement, the conductive part has a simple structure; at the same time, the second conductive part has good deformation performance, and the first conductive part and the third conductive part have high strength.

[0018] In some embodiments, the thickness of the first conductive portion ranges from 0.1 mm to 0.5 mm; the thickness of the third conductive portion ranges from 0.1 mm to 0.5 mm.

[0019] With such a configuration, the conductive member has sufficient strength and elasticity, and can absorb manufacturing tolerances through deformation, thereby ensuring that the conductive member fits tightly with the cover plate.

[0020] In some embodiments, the contact area between the conductive member and the first connection region is greater than or equal to 15 mm 2 , the contact area of ​​the second connection area of ​​the conductive member is greater than or equal to 15mm 2 .

[0021] This arrangement ensures sufficient contact area and stable connection. In addition, it provides sufficient magnetic connection area to ensure connection strength.

[0022] In some embodiments, the first connection area and the second connection area are grooves respectively; along the first direction, the conductive member is at least partially embedded in the cover plate, and the conductive member is at least partially embedded in the fixing block.

[0023] This arrangement helps prevent the conductive parts from being accidentally knocked off and ensures a reliable connection.

[0024] Exemplarily, the pole structure is a positive pole structure.

[0025] With such arrangement, when the conductive member is installed, the cover plate can be at the same potential as the positive pole structure.

[0026] In some embodiments, the second connection region extends to an end of the fixing block facing the first connection region.

[0027] Such an arrangement makes it easier to install the conductive member, ensures good contact between the conductive member and the battery cell, and helps provide deformation space for the conductive member to absorb tolerances.

[0028] An embodiment of the present disclosure provides a battery pack, which includes: a battery cell in the aforementioned battery cell device; a box for accommodating the battery cell; and a circuit board electrically connected to a cover plate of the battery cell.

[0029] By providing a circuit board electrically connected to the cover of the battery cell, the safety of the battery pack is improved. The battery cell configured in the embodiment of the present disclosure has a sound structure and is safe to use, avoiding the assembly of risky battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the structure of a battery cell device according to an embodiment of the present disclosure;

[0031] Figure 2 is a schematic exploded view of a battery cell device according to an embodiment of the present disclosure;

[0032] Figure 3 is a schematic top view of a cover plate assembly in an embodiment of the present disclosure;

[0033] Figure 4 Schematic diagram of the structure of the cover plate assembly in the embodiment of the present disclosure;

[0034] Figure 5 is a schematic structural diagram of a cover plate assembly in an embodiment of the present disclosure;

[0035] Figure 6 is a schematic front view of a conductive member in an embodiment of the present disclosure;

[0036] Figure 7 is a schematic top view of a conductive member in an embodiment of the present disclosure;

[0037] Figure 8 This is a schematic structural diagram of a magnet in an embodiment of the present disclosure;

[0038] Figure 9 Schematic connection block diagram of a battery pack according to an embodiment of the present disclosure.

[0039] Explanation of reference numerals: 1. pole structure; 11. pole plate; 12. pole; 2. first insulating member; 3. cover plate; 301. first connection area; 302. first mounting groove; 4. second insulating member; 5. fixing block; 501. second connection area; 502. first end; 503. second mounting groove; 6. magnet; 610. first magnet; 620. second magnet; 7. patch; 8. insulating film; 9. pole core; 10. cover plate assembly;

[0040] 100, battery cell device; 200, battery cell; 300, conductive member; 310, first conductive portion; 311, first outer side surface; 320, second conductive portion; 321, second outer side surface; 322, first inner side surface; 330, third conductive portion; 331, second inner side surface; 400, circuit board; 500, housing; 600, battery pack. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present disclosure more obvious and easy to understand, the specific implementation methods of the embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the embodiments of the present disclosure. However, the embodiments of the present disclosure can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the connotations of the embodiments of the present disclosure. Therefore, the embodiments of the present disclosure are not limited by the specific examples of the embodiments disclosed below.

[0042] In the description of the embodiments of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "perpendicular", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the embodiments of the present disclosure.

[0043] In the embodiments of the present disclosure, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0044] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. For example, the first conductive part may also be referred to as the third conductive part, and the third conductive part may also be referred to as the first conductive part. In the description of the embodiments of the present disclosure, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0045] In the embodiments of the present disclosure, unless otherwise clearly specified and limited, the terms "connected", "connected", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a flexible connection, or a rigid connection along at least one direction; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or directly connected with the presence of an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. The terms "installed", "set", "fixed", etc. can be broadly understood as connection. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0046] As used herein, the terms "layer" and "region" refer to a portion of a material that includes an area with a certain thickness. A layer can extend horizontally, vertically and / or along a tapered surface. A layer can be an area of ​​a uniform or non-uniform continuous structure, and its thickness perpendicular to the extension direction may not be greater than the thickness of the continuous structure. A layer can include multiple layers, which can be stacked layers or discretely extended layers. The shapes of the various regions and layers in the drawings and their relative sizes and positional relationships are only exemplary and may deviate from the actual shapes due to manufacturing tolerances or technical limitations, and the design can be adjusted according to actual needs.

[0047] refer to Figure 1 , Figure 1FIG2 shows a battery cell device according to an embodiment of the present disclosure. In an exemplary embodiment, the battery cell device 100 includes a battery cell 200 and a conductive member 300. Figure 2 As shown, the battery cell device 100 further includes a magnet 6 . In other embodiments, it can be considered that the battery cell 200 includes the magnet 6 .

[0048] The conductive member 300 is detachably connected to the battery cell 200 via the magnet 6. Optionally, the magnet 6 magnetically attracts the battery cell 200 and the conductive member 300; the magnet 6 is fixed to the battery cell 200 and magnetically attracts the conductive member 300; the magnet 6 magnetically attracts the battery cell 200 and is fixed to the conductive member 300; or some magnets 6 are fixed to the battery cell 200 and other magnets 6 are fixed to the conductive member 300, thereby detachably connecting the conductive member 300 to the battery cell 200 through magnetic attraction between at least one pair of magnets 6.

[0049] Illustratively, at least one of the conductive member 300 and the battery cell 200 includes a ferromagnetic portion to be magnetically attracted by the magnet 6. In some embodiments, the housing of the battery cell 200 is made of aluminum, and the magnet 6 can be secured to the battery cell 200 by bonding, snapping, or embedding. The conductive member 300 is made of a ferromagnetic metal or ferromagnetic alloy, and can be attracted by the magnet 6.

[0050] like Figure 2 As shown, the battery cell 200 includes a pole core 9 and a cover assembly 10. The cover assembly 10 can be a positive pole cover of the pole core 9, or the pole structure 1 is a positive pole structure. Figure 3 The shell of the battery cell 200 may include the outer shell of the pole core 9 and the cover plate 3 in the cover plate assembly 10. Figure 1 The battery cell 200 may further include a negative electrode cover plate, which is opposite to the positive electrode cover plate along the Z-axis direction. The positive electrode cover plate is configured as a cover plate assembly 10, and the negative electrode cover plate is a conventional cover plate.

[0051] like Figure 3 、 Figure 4 and Figure 5 As shown, the battery cell 200 includes a pole structure 1, a first insulating member 2, a cover plate 3, a second insulating member 4, and a fixing block 5, stacked sequentially along a first direction. The first direction may be parallel to the Z-axis. These components constitute the cover plate assembly 10 of the battery cell 200. For example, the cover plate assembly 10 further includes an explosion-proof disc and an insulating sleeve. The explosion-proof disc is disposed on the cover plate 3, and the insulating sleeve is disposed on the pole 12, separating the pole 12 from the cover plate 3. The second insulating member 4 and the fixing block 5 do not completely cover the cover plate 3; the explosion-proof disc may be spaced apart from the second insulating member 4.

[0052] The pole plate 11 of the pole structure 1 is stacked on the first insulating member 2. The pole 12 of the pole structure 1 passes through the first insulating member 2, the cover plate 3, and the second insulating member 4. The pole 12 is fixed to the fixing block 5. The fixing block 5 can be riveted to the pole 12, and the two are electrically connected. The pole 12 can be a positive pole and has a high potential.

[0053] The cover plate 3 has a first connection region 301. The first connection region 301 and the fixing block 5 are arranged along a second direction intersecting the first direction. The second direction may be parallel to the Y-axis. The fixing block 5 has a second connection region 501. Along the Y-axis, the second connection region 501 is located outside the second insulating member 4.

[0054] like Figure 6 、 Figure 7 Shown and referenced Figure 1 and Figure 2 , a portion of the conductive member 300 can be attached to the first connection area 301, and another portion can be attached to the second connection area 501. For example, the conductive member 300 includes a first conductive portion 310, a second conductive portion 320, and a third conductive portion 330 connected in sequence, wherein the first conductive portion 310 can be attached to the first connection area 301, and the third conductive portion 330 can be attached to the second connection area 501, so that the fixing block 5 is electrically connected to the cover plate 3 through the conductive member 300, and the pole 12 is further electrically connected to the cover plate 3. It can be considered that the cover plate 3 has achieved the same potential as the pole 12.

[0055] refer to Figure 2 Optionally, the magnet 6 is located in the first connection area 301 or the second connection area 501. The magnet 6 located in the first connection area 301 may be fixed to the cover plate 3, thereby magnetically attracting the first conductive portion 310. For example, the third conductive portion 330 may be retained in the second connection area 501, for example, by elasticity, and adhere to the fixing block 5. In other embodiments, the magnet 6 is fixed to the conductive member 300 and magnetically attracts the second connection area 501, thereby causing a portion of the conductive member 300 to adhere to the cover plate 3.

[0056] Illustratively, the plurality of magnets 6 include a first magnet 610 disposed in the first connection region 301 and a second magnet 620 disposed in the second connection region 501. The first magnet 610 is used to mate the first conductive portion 310 with the cover 3, and the second magnet 620 is used to mate the third conductive portion 330 with the fixing block 5. The magnets 6 provide reliable magnetic attraction and, when subjected to external forces, ensure that the conductive member 300 is detached without damaging the battery cell 200.

[0057] When the battery cell 200 is installed with the conductive member 300, the cover plate 3 and the shell of the battery cell 200 are electrically connected to the pole structure 1. The shell is charged and can achieve the same potential as the positive pole of the battery cell 200, so that the battery cell device 100 can prevent the shell from being electrochemically corroded during manufacturing, transportation or storage. In addition, if the shell of the battery cell 200 is accidentally short-circuited with the negative pole, the battery cell device 100 can avoid generating excessive current and causing thermal runaway of the battery cell 200.

[0058] In other embodiments, the terminal structure 1 is a negative terminal structure. When the conductive member 300 is installed, the cover 3 is at the same potential as the negative terminal, allowing for testing and other functions. The conductive member 300 can also be easily removed after testing. The battery cell 200 can still be used normally without the conductive member 300 installed.

[0059] refer to Figure 9 When using the battery cell 200 or assembling it into a battery pack 600, the conductive member 300 can be removed and only the battery cell 200 can be used. In this case, the cover plate 3 and the fixing block 5 can be insulated and separated by the second insulating member 4. This avoids the risk of high-voltage arcing between the cover plate 3 and the box body 500 when the insulating film 8 of the battery cell 200 is accidentally damaged.

[0060] In some embodiments, among the multiple magnets 6 in the battery cell device 100, at least one first magnet 610 is fixed to the first connection region 301, and at least one second magnet 620 is fixed to the second connection region 501. Furthermore, in the conductive member 300, at least a portion of each of the first conductive portion 310 and the third conductive portion 330 is ferromagnetic. The conductive member 300 has a simple structure and is lightweight, allowing it to be securely attached to the battery cell 200. The battery cell 200 has sufficient mounting space for the magnets 6, ensuring reliable attachment of the magnets 6.

[0061] like Figures 3 to 5 As shown, the first connection area 301 is provided with a first mounting groove 302, and the first mounting groove 302 is used to embed the first magnet 610. The second connection area 501 is provided with a second mounting groove 503, and the second mounting groove 503 is used to embed the second magnet 620. For example, the magnet 6 is bonded to the battery core 200. Along the Z-axis direction, the cover plate 3 may have an outer side and an inner side, for example Figure 4 Along the Z-axis, the outer side of the first magnet 610 can be flush with or recessed into the notch of the first mounting groove 302 to ensure that the conductive member 300 is well fitted to the cover 3; the outer side of the second magnet 620 can be flush with or recessed into the notch of the second mounting groove 503 to ensure that the conductive member 300 is well fitted to the fixing block 5.

[0062] In some embodiments, the first connection area 301 and the second connection area 501 are grooves respectively, the first conductive part 310 is at least partially embedded in the cover plate 3, and the third conductive part 330 is at least partially embedded in the fixed block 5, which helps to prevent the conductive part 300 from being accidentally bumped and dropped, and ensures reliable connection.

[0063] Along the X-axis, the size of the first connection area 301 is smaller than that of the cover plate 3, so that the first connection area 301 has side walls on both sides, which can better constrain the conductive member 300. The size of the second connection area 501 is smaller than that of the fixing block 5, so that the second connection area 501 has side walls on both sides, which can better constrain the conductive member 300.

[0064] In some embodiments, the second connection region 501 extends to the end of the fixing block 5 facing the first connection region 301. This end of the fixing block 5 may be referred to as the first end 502. The groove-shaped second connection region 501 connects to the first end 502, allowing the third conductive portion 330 to directly connect to the second conductive portion 320 along the Y-axis. This facilitates installation of the conductive member 300, ensures good contact between the conductive member 300 and the battery cell 200, and provides room for deformation of the second conductive portion 320 to accommodate tolerances.

[0065] Along the Y-axis, the first connection region 301 may be slightly larger than the length L5 of the first conductive portion 310 to accommodate tolerance or deformation. The second connection region 501 may be slightly larger than the length L6 of the third conductive portion 330 to accommodate tolerance or deformation.

[0066] In some embodiments, the first connection area 301 is provided with two first magnets 610, which are spaced apart along the third direction and located at the edges of the first connection area 301. The third direction is perpendicular to the first direction and the second direction, for example, parallel to the X-axis. The first connection area 301 may be provided with two first mounting grooves 302 spaced apart along the third direction and close to the edge, each of which may be provided with a first magnet 610. The first conductive portion 310 is magnetically attracted on both sides along the X-axis, which prevents it from warping and ensures that the first conductive portion 310 is well adhered to the cover 3.

[0067] For example, the second connection area 501 is provided with two second magnets 620, which are spaced apart along the third direction and located at the edges of the second connection area 501. The second connection area 501 may be provided with two second mounting grooves 503 spaced apart along the third direction and close to the edge, and each second mounting groove 503 may be provided with a second magnet 620. The third conductive portion 330 is magnetically attracted along both sides of the X-axis to prevent warping, and the third conductive portion 330 can be well attached to the fixing block 5. The conductive member 300 can be relatively firmly attached to the battery cell 200 through the magnet 6, ensuring a reliable electrical connection and preventing accidental dropping.

[0068] refer to Figure 6 , the first conductive portion 310 and the third conductive portion 330 of the conductive member 300 may be different. In other embodiments, the conductive member 300 may have a centrally symmetrical structure in the YZ plane, and the first conductive portion 310 and the third conductive portion 330 may be used interchangeably. With respect to the cover assembly 10, the portion connected to the first connection area 301 may be referred to as the first conductive portion 310, and the first conductive portion 310 has a first outer side surface 311. The second conductive portion 320 has a second outer side surface 321 and a first inner side surface 322. The portion connected to the second connection area 501 is referred to as the third conductive portion 330, and the third conductive portion 330 has a second inner side surface 331.

[0069] In some embodiments, the second conductive portion 320 extends in an angled direction relative to the first direction. Along the first direction, the included angle A2 between the second outer side surface 321 of the second conductive portion 320 and the first outer side surface 311 of the first conductive portion 310 is greater than 90°, and the included angle A2 between the first inner side surface 322 of the second conductive portion 320 and the second inner side surface 331 of the third conductive portion 330 is greater than 90°. Both the included angle A1 and the included angle A2 can be greater than 90° and less than 180°, which helps ensure the elastic deformation capability of the conductive member 300 and ensures that both the first conductive portion 310 and the third conductive portion 330 are tightly attached to the battery cell 200.

[0070] The first conductive portion 310 and the third conductive portion 330 may be parallel to each other.

[0071] The second conductive portion 320 can avoid the second insulating member 4 to avoid interference and poor contact. In addition, the inclined second conductive portion 320 is also convenient for disassembling the conductive member 300.

[0072] In some embodiments, the conductive member 300 is a conductive sheet, the thickness L2 of the second conductive part 320 is thinner than the thickness L3 of the first conductive part 310, and the thickness L2 of the second conductive part 320 is thinner than the thickness L1 of the third conductive part 330. The conductive member 300 is a thin sheet with a simple structure and light weight. At the same time, the second conductive part 320 has good deformation performance, and the first conductive part 310 and the third conductive part 330 have high strength.

[0073] In some embodiments, the thickness L3 of the first conductive portion 310 may be smaller than the thickness of the cover plate 3 , to ensure that the first connection region 301 can accommodate the first conductive portion 310 as much as possible.

[0074] For example, the thickness L3 of the first conductive portion 310 ranges from 0.1 mm to 0.5 mm, and the thickness L1 of the third conductive portion 330 ranges from 0.1 mm to 0.5 mm. The conductive member 300 has sufficient strength and elasticity to absorb manufacturing tolerances through deformation, ensuring a close fit between the conductive member 300 and the cover plate 3. For example, if the thickness L3 is 0.2 mm and the thickness L1 is 0.2 mm, the thickness L2 of the second conductive portion 320 can be 0.2 mm or 1.5 mm.

[0075] The second inner side surface 331 of the third conductive portion 330 is configured to be in contact with the fixing block 5, while the inner side surface of the first conductive portion 310 is configured to be in contact with the cover plate 3. The distance L4 along the Z-axis between the second inner side surface 331 of the third conductive portion 330 and the inner side surface of the first conductive portion 310 can be equal to the step difference between the first connection area 301 and the second connection area 501. The conductive member 300 in the free state and the mounted state may be deformed.

[0076] In some embodiments, the contact area of ​​the first conductive portion 310 is greater than or equal to 15 mm. 2 , the contact area of ​​the third conductive portion 330 is greater than or equal to 15mm 2 The conductive member 300 and the battery cell 200 have sufficient contact area, and the connection is stable. In addition, sufficient magnetic connection area is provided to ensure connection strength.

[0077] Along the Y-axis direction, the length L5 of the first conductive portion 310 may be greater than or equal to 3 mm, and the length L6 of the third conductive portion 330 may be greater than or equal to 3 mm. Figure 7 , the width dimension L7 of each of the first conductive portion 310 and the third conductive portion 330 may be greater than or equal to 5 mm.

[0078] Illustratively, the area of ​​the plurality of first mounting grooves 302 in the first connection area 301 is less than half of the area of ​​the first connection area 301 , ensuring sufficient contact area between the conductive member 300 and the cover plate 3 while ensuring connection strength.

[0079] The distance between the first connection area 301 and the second connection area 501 along the Y-axis direction can be configured according to the size of the second conductive portion 320 , thereby ensuring the installation strength of the conductive member 300 and facilitating its removal.

[0080] refer to Figure 8 The magnet 6 can be a cylinder, and the first mounting groove 302 and the second mounting groove 503 can both be cylindrical holes. The magnet 6 can be installed with the cover assembly 10 or can be recycled.

[0081] The conductive member 300 can be recycled at a low cost. In addition, the conductive member 300 is made of a single material and can be directly recycled easily.

[0082] Combine Figure 2 As shown, the battery cell device 100 further includes a patch 7 , which is attached to the cover plate 3 and may be provided with a plurality of hollow holes for avoiding the fixing block 5 , avoiding the first connection area 301 , and avoiding the explosion-proof plate and other structures.

[0083] refer to Figure 9 , an embodiment of the present disclosure provides a battery pack 600 , which includes a battery cell 200 , a box 500 and a circuit board 400 .

[0084] The box 500 is used to accommodate the battery cell 200 and can accommodate multiple battery cells 200 .

[0085] The battery cell 200 is the battery cell 200 of the aforementioned battery cell device 100, with the conductive member 300 removed. The battery cell 200 may include or be provided with a magnet 6. During assembly of the battery pack 600, only the structurally sound and safe battery cells 200 are assembled, preventing the assembly of hazardous battery cells 200 into the battery pack 600.

[0086] The circuit board 400 is electrically connected to the cover 3 of the battery cell 200. The circuit board 400 can be connected to the outer shell of the pole core 9 or directly to the cover 3, for example, at the first connection area 301. For example, some interfaces of the circuit board 400 are also electrically connected to the pole 12.

[0087] The circuit board 400 is electrically connected to the cover plate 3 of the battery cell 200. The circuit board 400 prevents electrochemical corrosion of the cover plate 3 in the battery pack 600, improving the safety of the battery pack 600. Furthermore, if the insulating film 8 of the battery cell 200 is accidentally damaged, the circuit board 400 controls the contact between the cover plate 3 and the housing 500, preventing high-voltage arcing.

[0088] The technical features of the embodiments disclosed above can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above 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.

[0089] In the embodiments disclosed above, unless otherwise expressly specified and limited, the order of execution of the steps is not limited. For example, the steps may be executed in parallel or in a different order. The sub-steps of each step may also be executed in an interleaved manner. The above-mentioned various forms of processes may be used, and steps may be reordered, added, or deleted. As long as the desired results of the technical solutions provided in the embodiments of the present disclosure can be achieved, this document does not impose any restrictions thereon.

[0090] The embodiments disclosed above merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent protection of the present application. It should be noted that a person skilled in the art could make several variations and improvements without departing from the concept of the present application, all of which fall within the scope of the patent protection claimed by the present application. Therefore, the scope of the patent protection of the present application shall be subject to the appended claims.

Claims

1. A battery cell device, characterized in that: include: A battery cell, the battery cell comprising a pole structure, a first insulating member, a cover plate, a second insulating member, and a fixing block stacked in sequence along a first direction, wherein the pole plate of the pole structure is stacked on the first insulating member, the pole of the pole structure passes through the first insulating member, the cover plate, and the second insulating member, and the pole is fixed to the fixing block; the cover plate has a first connection area, the first connection area and the fixing block are arranged along a second direction intersecting the first direction; the fixing block has a second connection area; a conductive member, a portion of which can be attached to the first connection area, and another portion of which can be attached to the second connection area, so that the fixing block is electrically connected to the cover plate through the conductive member; as well as A magnet, wherein the conductive member is detachably connected to the first connection area or the second connection area via the magnet.

2. The battery cell device according to claim 1, characterized in that The plurality of magnets in the battery core device include at least one first magnet fixed to the first connection area and at least one second magnet fixed to the second connection area; The portion of the conductive member corresponding to the first magnet and the portion corresponding to the second magnet are both ferromagnetic portions.

3. The battery cell device according to claim 2, characterized in that: The first connection area is provided with two first magnets, the two first magnets are spaced apart along a third direction and are respectively located at edges of the first connection area, the third direction being perpendicular to the first direction and perpendicular to the second direction; The second connection area is provided with two second magnets, and the two second magnets are spaced apart along the third direction and are respectively located at edges of the second connection area.

4. The battery cell device according to claim 1, wherein: The conductive member includes a first conductive portion, a second conductive portion, and a third conductive portion connected in sequence for contacting the first connection area; the extension direction of the second conductive portion is inclined relative to the first direction; Along the first direction, an angle between an outer side surface of the second conductive portion and an outer side surface of the first conductive portion is greater than 90°, and an angle between an inner side surface of the second conductive portion and an inner side surface of the third conductive portion is greater than 90°.

5. The battery cell device according to claim 4, characterized in that: The conductive member is a conductive sheet, the second conductive portion is thinner than the first conductive portion, and the second conductive portion is thinner than the third conductive portion.

6. The battery cell device according to claim 5, characterized in that: The thickness of the first conductive portion ranges from 0.1 mm to 0.5 mm; the thickness of the third conductive portion ranges from 0.1 mm to 0.5 mm.

7. The battery cell device according to claim 1, characterized in that: The contact area between the conductive member and the first connection area is greater than or equal to 15 mm 2 The contact area between the conductive member and the second connection area is greater than or equal to 15mm 2 .

8. The battery cell device according to any one of claims 1 to 7, characterized in that: The first connection area and the second connection area are grooves respectively; Along the first direction, the conductive member is at least partially embedded in the cover plate, and the conductive member is at least partially embedded in the fixing block.

9. The battery cell device according to claim 8, characterized in that: The second connection area extends to one end of the fixing block facing the first connection area; and the pole structure is a positive pole structure.

10. A battery pack, characterized in that: include: The battery cell of the battery cell device according to any one of claims 1 to 9; A box body, used for accommodating the battery cell; as well as A circuit board is electrically connected to the cover plate of the battery cell.

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