Battery pack

Abstract

The embodiment of the utility model provides a battery pack. The battery pack comprises battery monomers and a box body, the box body comprises a frame body, a first brace and a second brace, the frame body comprises a first side and a second side which are oppositely arranged along a first direction, an accommodating space is arranged in the frame body, and the battery monomers are arranged in the accommodating space; the first brace extends along the second direction, is connected to the first side of the frame body and is connected with the battery monomers; and the second brace extends along the second direction, is connected to the second side of the frame body and is connected with the battery monomer. The first brace and the second brace can press the single batteries, and the amplitude of the single batteries under the vibration working condition is reduced, so that the risk of damage to the battery pack is reduced; when the bottom of the battery pack is impacted, the second brace can provide buffering for deformation of the bottom of the battery pack; in addition, when the battery monomers are expanded, the first brace and the second brace can limit the outward displacement of the frame body, so that the safety of the battery pack is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of power batteries, and specifically relates to a battery pack. Background Art

[0002] The battery pack is often in a vibrating condition during actual use. During the vibration process, the joints and welds of the battery cell structure inside the battery pack are prone to breakage, causing damage to the battery pack. Furthermore, since the battery packs of new energy vehicles are generally arranged under the chassis of the vehicle, a large area is exposed under the vehicle. The battery pack may be damaged during the driving process of the vehicle. In addition, during the charging and discharging process of the power battery, the battery cells inside the battery pack will expand. Excessive expansion of the battery cells will reduce the safety of the battery pack, and in severe cases, liquid leakage or explosion may occur.

[0003] Therefore, there is an urgent need to propose a new battery pack to solve the problem that the battery pack is easily damaged in various usage scenarios. Utility Model Content

[0004] The present application aims to provide a battery pack to solve the problem that existing battery packs are easily damaged in various usage scenarios.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] The present application discloses a battery pack, the battery pack having a first direction, a second direction and a third direction intersecting each other, the battery pack comprising: a battery cell and a box body;

[0007] The box body comprises a frame body, a first pull bar, and a second pull bar, the frame body comprises a first side and a second side arranged opposite to each other along the first direction, a receiving space is arranged in the frame body, and the battery cell is arranged in the receiving space;

[0008] The first pull bar extends along the second direction and is connected to the first side of the frame, and the first pull bar is connected to the battery cell to press the battery cell from the first side of the frame; the second pull bar extends along the second direction and is connected to the second side of the frame, and the second pull bar is connected to the battery cell to press the battery cell from the second side of the frame.

[0009] Optionally, the box body further includes a bottom plate, which is located on a side of the second pull bar away from the battery cell and connected to the frame body, and the bottom plate abuts against the second pull bar.

[0010] Optionally, a buffer cavity extending along the second direction is arranged in the second pull strip.

[0011] Optionally, the second pull bar further includes a reinforcing rib extending along the second direction, and the reinforcing rib is connected to at least one cavity wall of the buffer cavity.

[0012] Optionally, there are multiple reinforcing ribs, and the multiple reinforcing ribs are arranged at intervals along the third direction.

[0013] Optionally, the battery pack further includes a buffer, wherein the buffer is disposed between the first pull rod and the battery cell, and / or the buffer is disposed between the second pull rod and the battery cell.

[0014] Optionally, at least two limiting protrusions are provided on a side of the first pull bar close to the battery cell, and / or on a side of the second pull bar close to the battery cell, a receiving groove is formed between two adjacent limiting protrusions, and the buffer is arranged in the receiving groove.

[0015] Optionally, the frame includes a front frame, a support beam, and a rear frame spaced apart along the second direction;

[0016] The battery cell is disposed between the support beam and the rear frame, wherein two ends of the first pull bar along the second direction and two ends of the second pull bar along the second direction are fixedly connected to the support beam and the rear frame respectively.

[0017] Optionally, the frame body further includes a boss, the support beam and / or the rear frame is / are connected to the boss on a side close to the battery cell, and the second pull bar is connected to the boss.

[0018] Optionally, the battery pack further includes a mounting member, which is connected to the frame and presses and fixes the second pull bar to the frame.

[0019] Optionally, the mounting member has an extension portion and a recessed portion, the extension portion is arranged on both sides of the recessed portion, the extension portion is connected to the frame, and the recessed portion is connected to the second pull bar.

[0020] Optionally, the first pull bar includes a first section and a second section connected along the second direction, the second section is connected to the first surface of the battery cell, and the first section is provided with an avoidance groove on one side close to the second section.

[0021] Optionally, the battery pack further includes an adhesive component, and the second pull strip is further provided with an adhesive groove, which is arranged on the side of the second pull strip away from the battery cell and is used to accommodate the adhesive component, and the adhesive component is located between the mounting component and the second pull strip and bonds the mounting component and the second pull strip.

[0022] The present application achieves a compacting effect on the battery cell by arranging the battery cell between the first pull bar and the second pull bar, thereby reducing the amplitude of the battery cell under vibration conditions and reducing the risk of damage to the battery pack; when the bottom of the battery pack is impacted, the presence of the second pull bar can provide a buffer for the deformation of the bottom of the battery pack; in addition, the first pull bar and the second pull bar are fixedly connected to the frame, and when the battery cell expands and applies expansion force to the frame, the first pull bar and the second pull bar can limit the outward displacement of the frame, thereby reducing the risk of damage to the battery pack due to excessive expansion of the battery cell and improving the safety of the battery pack.

[0023] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 is a schematic diagram of the battery pack structure described in an embodiment of the present application;

[0026] Figure 2 is a schematic diagram of a battery pack explosion according to an embodiment of the present application;

[0027] Figure 3 is a cross-sectional view of the connection between the battery pack pull bar and the frame according to the embodiment of the present application;

[0028] Figure 4 yes Figure 3 A magnified schematic diagram of the middle part;

[0029] Figure 5 yes Figure 3 The enlarged schematic diagram of the middle B part;

[0030] Figure 6 is a schematic diagram of the second pull bar of the battery pack according to the embodiment of the present application;

[0031] Figure 7 yes Figure 6 Enlarged schematic diagram of middle C part;

[0032] Figure 8 is a schematic diagram of the bonding groove described in the embodiment of the present application;

[0033] Fig. 9 is a schematic diagram of the installation member described in the embodiment of the present application;

[0034] Fig.10 This is a schematic diagram of the connection between the second pull bar and the frame in an embodiment of the present application;

[0035] Fig.11 yes Fig.10 The enlarged schematic diagram of the middle D part;

[0036] Fig.12 This is a schematic diagram of the avoidance groove described in the embodiment of the present application.

[0037] Figure numerals: 1-battery cell; 2-box; 201-first side; 202-second side; 21-frame; 211-front frame; 212-support beam; 213-rear frame; 214-boss; 22-first pull bar; 221-avoidance groove; 23-second pull bar; 231-buffer cavity; 232-reinforcement rib; 233-adhesive groove; 24-bottom plate; 3-buffer member; 4-limiting protrusion; 41-accommodating groove; 5-mounting member; 51-extension portion; 52-recessed portion; 6-adhesive member. DETAILED DESCRIPTION

[0038] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0039] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0040] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like 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 present application and simplifying the description, and do 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 should not be understood as a limitation on the present application.

[0041] The term "parallel" in this application includes not only the absolute parallel situation, but also the generally parallel situation conventionally recognized in engineering, such as "parallel" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°; at the same time, "vertical" also includes not only the absolute vertical situation, but also the generally vertical situation conventionally recognized in engineering, such as "vertical" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles include not only the absolute equal situation, but also the generally equal situation conventionally recognized in engineering, that is, there may be a certain error, such as the state where the tolerance range is -1% to 1%.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] With the rapid development of battery technology, new energy vehicles are becoming more and more common in daily life. New energy vehicles may encounter various road conditions during actual driving, which often puts the battery pack of the vehicle in various vibration conditions. During the vibration process of the battery pack, if the internal battery cell structure is not reliably fixed, the connection between the battery cells is prone to breakage, causing damage to the battery pack; furthermore, when the battery pack is arranged under the chassis of the whole vehicle and exposed to a large area under the vehicle, during the driving process of the vehicle, foreign objects splashed from the road surface may hit the bottom of the battery pack, which may also cause damage to the battery pack; in addition, the expansion of the battery cells inside the battery pack will reduce the safety of the battery pack, and in severe cases, liquid leakage or explosion may occur.

[0044] Based on the above content, the embodiment of the present application provides a battery pack, which can first reduce the amplitude of the battery cell under vibration conditions and reduce the risk of damage to the battery pack; secondly, when the bottom of the battery pack is hit, it can also provide a buffer for the deformation of the bottom of the battery pack; in addition, when the battery cell expands and applies expansion force to the frame, the risk of damage to the battery pack caused by excessive expansion of the battery cell of the battery pack is also greatly reduced, thereby improving the safety of the battery pack. The battery cell of the battery pack can be a cylindrical cell, a soft-pack cell, or a square cell, etc., which is not specifically limited in the present application.

[0045] Reference Figure 1 , showing a schematic diagram of the battery pack structure of the embodiment of the present application; referring to Figure 2 , shows a schematic diagram of the battery pack explosion described in the embodiment of the present application. Figure 1 and Figure 2 As shown, the battery pack has a first direction, a second direction and a third direction intersecting each other, wherein the first direction is the direction indicated by arrow X, the second direction is the direction indicated by arrow Y, and the third direction is the direction indicated by arrow Z. In this embodiment, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0046] In the embodiment of the present application, the battery pack may specifically include: a battery cell 1 and a box body 2, wherein the battery cell 1 is arranged in the box body 2, and the length, width and height of the battery cell 1 are arranged along the second direction Y, the third direction Z and the first direction X respectively; when a plurality of battery cells 1 are arranged in the battery pack, the plurality of battery cells 1 are arranged at intervals along the second direction Y. The box body 2 can prevent the battery cell 1 from being subjected to external physical impact and extrusion, and play a protective role on the battery cell 1.

[0047] Specifically, the box body 2 includes a frame body 21, a first pull bar 22, and a second pull bar 23. The frame body 21 can be set as a rectangular frame to facilitate the arrangement of other devices inside the battery pack, such as electronic and electrical components, thermal management components, etc.; the frame body 21 includes a first side 201 and a second side 202 arranged relatively along a first direction X. A accommodating space is set in the frame body 21, and the battery cell 1 is arranged in the accommodating space.

[0048] Specifically, the first tie bar 22 extends along the second direction Y and is connected to the first side 201 of the frame 21, and the first tie bar 22 is connected to the battery cell 1 to press the battery cell 1 from the first side 201 of the frame 21; the second tie bar 23 extends along the second direction Y and is connected to the second side 202 of the frame 21, and the second tie bar 23 is connected to the battery cell 1 to press the battery cell 1 from the second side 202 of the frame 21. Since the length of the battery cell 1 is also arranged along the second direction Y, the contact area between the first tie bar 22, the second tie bar 23 and the single battery cell 1 is larger, so that when the battery cell 1 is vibrated, the first tie bar 22, the second tie bar 23 has a more obvious effect of reducing the amplitude of the battery cell 1.

[0049] In practical applications, the selection of the material of the frame 21 needs to consider strength and weight, etc. For example, it can be made of steel or aluminum alloy. Among them, steel has high strength and corrosion resistance and can be used in large electric vehicles. Aluminum alloy has both strength and thermal conductivity, and is light in weight and easy to process, and can be used in small electric vehicles. Of course, the frame 21 can also be made of other composite materials with low density, high strength and good insulation, and the present application does not make specific limitations on this.

[0050] In the embodiment of the present application, the box body 2 further includes a bottom plate 24 , which is located on a side of the second pull bar 23 away from the battery cell 1 and connected to the frame body 21 , and the bottom plate 24 abuts against the second pull bar 23 .

[0051] Specifically, Figure 2 As shown, the bottom plate 24 is connected to the second side 202 of the frame 21, and the second pull bar 23 is located between the battery cell 1 and the bottom plate 24. Since the second pull bar 23 is located between the battery cell 1 and the bottom plate 24, a gap along the first direction X can be provided between the bottom plate 24 and the battery cell 1. Therefore, when the bottom plate 24 is impacted, the gap can reserve space for the deformation of the bottom plate 24 caused by the impact, thereby improving the safety of the battery device; further, the dimensions of the bottom plate 24 along the second direction Y and the third direction Z can completely cover the entire frame 21. After the bottom plate 24 is connected to the frame 21, the bottom of the frame 21 can be sealed. In actual applications, the battery pack can also include a cover plate, which is connected to the side of the frame 21 away from the bottom plate 24. The cover plate, the bottom plate 24, and the frame 21 are enclosed to seal the battery cell 1.

[0052] Reference Figure 3 , showing a cross-sectional view of the connection between the battery pack pull bar and the frame 21 according to the embodiment of the present application; Figure 4 , showing Figure 3 Enlarged schematic diagram of part A in the middle; refer to Figure 5 , showing Figure 3 Enlarged schematic diagram of part B in the middle.

[0053] In the present application embodiment, Figure 4 , Figure 5 As shown, a buffer cavity 231 extending along the second direction Y is disposed in the second pull bar 23 .

[0054] It should be noted that, in some embodiments, when the battery pack is assembled, the first pull bar 22 is arranged close to the vehicle chassis, and the second pull bar 23 is arranged away from the vehicle chassis. Therefore, when the battery pack is hit, the second pull bar 23 at the bottom will be subjected to a greater impact force. The buffer cavity 231 arranged in the second pull bar 23 can absorb the impact force of the battery pack being hit by the ball, thereby reducing the probability of damage to the battery cell 1 and achieving the effect of protecting the battery cell 1.

[0055] In the embodiment of the present application, the second pull bar 23 further includes a reinforcing rib 232 . The reinforcing rib 232 extends along the second direction Y. The reinforcing rib 232 is connected to at least one cavity wall of the buffer cavity 231 .

[0056] Specifically, the reinforcing rib 232 and the second tie bar 23 are an integrally formed structure, the length of the reinforcing rib 232 extends along the second direction Y, and the two sides of the reinforcing rib 232 along the first direction X are respectively connected to the two cavity walls of the buffer cavity 231 along the first direction X, thereby separating the buffer cavity 231 along the third direction Z. In practical applications, the provision of the reinforcing rib 232 improves the structural strength of the second tie bar 23, so that the deformation of the second tie bar 23 when subjected to impact force is smaller, further reducing the risk of damage to the battery cell 1 when the battery pack is impacted. In other embodiments, the reinforcing rib 232 is connected to a side cavity wall of the buffer cavity 231 along one side of the first direction X.

[0057] In the embodiment of the present application, there are multiple reinforcing ribs 232, and the multiple reinforcing ribs 232 are arranged at intervals along the third direction Z.

[0058] Specifically, the plurality of reinforcing ribs 232 are evenly spaced along the third direction Z, so that the buffer cavity 231 of the second tie bar 23 can be divided into a plurality of small cavities spaced along the third direction Z. In practical applications, the plurality of reinforcing ribs 232 can further strengthen the strength of the second tie bar 23, and while the plurality of small cavities absorb the impact force of the battery pack being hit by the ball, the plurality of second tie bars 23 themselves can absorb as much impact force as possible.

[0059] like Figure 5 As shown, in some embodiments, the battery pack further includes a buffer 3, and the buffer 3 is disposed between the first pull bar 22 and the battery cell 1. In other embodiments, the buffer 3 is disposed between the second pull bar 23 and the battery cell 1. In some embodiments, a buffer 3 is disposed between the first pull bar 22 and the battery cell 1, and between the second pull bar 23 and the battery cell 1. Specifically, the buffer 3 is a colloid with adhesive properties, and the first pull bar 22 and the second pull bar 23 are bonded to the battery cell 1 through the buffer 3. At the same time, since the first pull bar 22 and the second pull bar 23 are connected to the surface of the battery cell 1 through the buffer 3, when the battery pack vibrates, the friction between the first pull bar 22 and the second pull bar 23 and the surface of the battery cell 1 can be prevented, resulting in wear of the battery cell 1, thereby protecting the battery cell 1. In other embodiments, the buffer 3 can also be an elastic structural member such as foam.

[0060] In some embodiments, at least two limiting protrusions 4 are provided on the side of the first pull bar 22 close to the battery cell 1; in some embodiments, at least two limiting protrusions 4 are provided on the side of the second pull bar 23 close to the battery cell 1; in some embodiments, at least two limiting protrusions 4 are provided on the side of the first pull bar 22 and the second pull bar 23 close to the battery cell 1. An accommodating groove 41 is formed between two adjacent limiting protrusions 4, and the buffer 3 is arranged in the accommodating groove 41.

[0061] Reference Figure 6 , showing a schematic diagram of the second pull bar 23 of the battery pack according to the embodiment of the present application; referring to Figure 7 , showing Figure 6 The enlarged schematic diagram of the middle C part; Figure 6 , Figure 7 As shown, the limiting protrusion 4 extends along the second direction Y, and at least two adjacent limiting protrusions 4 are spaced apart along the third direction Z. In practical applications, the limiting protrusion 4 can be integrally formed with the first pull bar 22 or the second pull bar 23, or a separate limiting bar can be connected to the first pull bar 22 or the second pull bar 23 by bonding or the like. It can be understood that since the limiting protrusion 4 protrudes from the surface of the first pull bar 22 or the second pull bar 23, a receiving groove 41 can be formed between the two limiting protrusions 4 accordingly, and the buffer 3 is arranged in the receiving groove 41, which can ensure that the buffer 3 is located between the first pull bar 22 or the second pull bar 23 and the battery cell 1, thereby preventing the buffer 3 from overflowing from the connection between the first pull bar 22 or the second pull bar 23 and the battery cell 1, thereby affecting other components in the battery pack.

[0062] In the embodiment of the present application, the frame 21 includes a front frame 211, a support beam 212, and a rear frame 213 which are arranged at intervals along the second direction Y; the battery cell 1 is arranged between the support beam 212 and the rear frame 213, wherein the two ends of the first pull bar 22 along the second direction Y and the two ends of the second pull bar 23 along the second direction Y are fixedly connected to the support beam 212 and the rear frame 213 respectively.

[0063] Specifically, if Figure 1 and Figure 2 As shown, the frame 21 also includes two side frames arranged at intervals along a third direction Z, and the two side frames are connected with the front frame 211 and the rear frame 213 to form the main frame of the frame 21 and form a accommodating space, and the support beam 212 is arranged between the support beam 212 and the rear frame 213, and the support beam 212 is connected to the two side frames on both sides along the third direction Z to separate the accommodating space; wherein, the battery cell 1 is arranged between the support beam 212 and the rear frame 213, and the accommodating space formed between the front frame 211 and the support beam 212 can provide installation space for the arrangement of other components of the battery pack, such as electronic and electrical components, thermal management components, etc.

[0064] In addition, first mounting holes are provided at both ends of the first tie bar 22, and second mounting holes are provided at both ends of the second tie bar 23. The first tie bar 22 and the second tie bar 23 are fixed to the support beam 212 and the rear frame 213 by fasteners passing through the first mounting holes and the second mounting holes. The fasteners may be screws, bolts, etc.

[0065] In the embodiment of the present application, the frame 21 also includes a boss 214. Of course, the number of bosses 214 can be multiple. The side of the support beam 212 close to the battery cell 1 is connected to the boss 214, and the second tie bar 23 is connected to the boss 214. In other embodiments, the frame 21 also includes a boss 214, the side of the rear frame 213 close to the battery cell 1 is connected to the boss 214, and the second tie bar 23 is connected to the boss 214. In some embodiments, the support beam 212 and the rear frame 213 close to the battery cell 1 are both connected to the boss 214. In this way, the connection between the second tie bar 23 and the support beam 212 or the rear frame 213 in the frame 21 will not cause interference with the connection between the frame 21 and other components.

[0066] In the embodiment of the present application, the battery pack further comprises a mounting member 5, which is connected to the frame 21 and presses and fixes the second tie bar 23 to the frame 21. Preferably, in the embodiment of the present application, the mounting member 5 is connected to the boss 214 on the frame 21 and presses and fixes the second tie bar 23 to the boss 214.

[0067] Specifically, refer to Fig.10 , showing a schematic diagram of the connection between the second pull bar 23 and the frame 21 in the embodiment of the present application; Fig.11 , showing Fig.10 The enlarged schematic diagram of the D part in the middle; Fig.10 , Fig.11 As shown, the boss 214 is connected to the second tie bar 23 through the mounting member 5 by a fastener, so as to connect the second tie bar 23 to the support beam 212 and / or the rear frame 213; further, the boss 214 is arranged close to the battery cell 1, and protrudes along the second direction Y toward the first tie bar 22 or the second tie bar 23; it should be noted that, since the bottom of the frame 21 needs to be connected to the bottom plate 24 or other components, the connection surface on the boss 214 for connecting the second tie bar 23 also has a reserved distance from the edge of the frame 21 to form The avoidance space is located on the side of the boss 214 away from the first pull bar 22. The setting of the boss 214 avoids the connection between the second pull bar 23 and the bottom of the frame 21, thereby providing an avoidance space for the connection and installation of the bottom plate 24 or other components. In the embodiment of the present application, the second pull bar 23 is at least partially accommodated in the avoidance space; in addition, the setting of the boss 214 can avoid drilling holes on the second pull bar 23 for installation, which is beneficial to reducing the risk of deformation of the installation hole of the second pull bar 23 and damage to the second pull bar 23 when the battery pack is subjected to external force.

[0068] Further, refer to Fig. 9 , shows a schematic diagram of the mounting member 5 described in the embodiment of the present application, such as Fig. 9As shown, the mounting member 5 has an extension portion 51 and a recessed portion 52. The extension portion 51 is disposed on both sides of the recessed portion 52. The extension portion 51 is connected to the frame 21, and the recessed portion 52 is connected to the second pull bar 23. Preferably, in the embodiment of the present application, the extension portion 51 is connected to the boss 214.

[0069] The extension portion 51 of the mounting member 5 is provided with a third mounting hole, the boss 214 is provided with a fourth mounting hole, the third mounting hole and the fourth mounting hole are arranged opposite to each other, the second tie bar 23 is arranged in the recessed portion 52 of the mounting member 5, and the fastener passes through the third mounting hole and the fourth mounting hole in sequence to fix the second tie bar 23 on the boss 214. In practical applications, since the mounting member 5 is provided with the recessed portion 52, the second tie bar 23 can be better limited, so as to prevent the friction between the second tie bar 23 and the battery cell 1 and cause the battery cell 1 to wear.

[0070] In the embodiment of the present application, the first pull bar 22 includes a first section and a second section connected along the second direction Y, wherein the second section is used to connect to the first surface of the battery cell 1, and the first section is provided with an avoidance groove 221 on one side close to the second section. Fig.12 , shows a schematic diagram of the avoidance groove 221 according to an embodiment of the present application, such as Fig.12 As shown, in the first section of the first pull bar 22, a mounting hole is provided on the side away from the second section for connecting the first pull bar 22 with the frame 21, and an avoidance groove 221 provided on the side close to the second section can provide an avoidance space for the lines arranged on the top of the battery cell 1, thereby preventing the top wiring of the first pull bar 22 from affecting the connection between the cover plate and the frame 21.

[0071] In the embodiment of the present application, the battery pack also includes an adhesive member 6, and the second pull strip 23 is also provided with an adhesive groove 233, which is arranged on the side of the second pull strip 23 away from the battery cell 1 and is used to accommodate the adhesive member 6, and the adhesive member 6 is located between the mounting member 5 and the second pull strip 23.

[0072] Specifically, if Figure 8 As shown, a schematic diagram of the adhesive groove 233 described in the embodiment of the present application is shown; in actual applications, when the support beam 212 and / or the rear frame 213 are provided with a boss 214, the second pull strip 23 is connected to the boss 214 through the mounting member 5. When the second pull strip 23 is subjected to a large force, it may be detached from the recessed portion 52 of the mounting member 5. Therefore, the setting of the adhesive groove 233 and the adhesive member 6 can further strengthen the connection strength between the second pull strip 23 and the mounting member 5, thereby ensuring the use effect of the second pull strip 23.

[0073] In the embodiment of the present application, the number of first pull bars 22 and second pull bars 23 are both multiple, and the multiple first pull bars 22 are arranged at intervals along the third direction Z on the first side 201 of the frame 21, and the multiple second pull bars 23 are arranged at intervals along the third direction Z on the second side 202 of the frame 21.

[0074] Specifically, a plurality of first pull strips 22 are evenly spaced along the third direction Z on the first side 201 of the frame 21, and a plurality of second pull strips 23 are evenly spaced along the third direction Z on the second side 202 of the frame 21. Furthermore, the number of first pull strips 22 and second pull strips 23 arranged on each battery cell 1 can be set to be equal, thereby ensuring that the protection effect of the first pull strips 22 and the second pull strips 23 on the plurality of battery cells 1 is more balanced.

[0075] In summary, the present application arranges the battery cell between the first pull rod and the second pull rod to achieve a compression effect on the battery cell, thereby reducing the amplitude of the battery cell under vibration conditions and reducing the risk of damage to the battery pack; when the bottom of the battery pack is impacted, the presence of the second pull rod can provide a buffer for the deformation of the bottom of the battery pack; in addition, the first pull rod and the second pull rod are fixedly connected to the frame, and when the battery cell expands and applies expansion force to the frame, the first pull rod and the second pull rod can limit the outward displacement of the frame, thereby reducing the risk of damage to the battery pack due to excessive expansion of the battery cell and improving the safety of the battery pack.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0077] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: The battery pack has a first direction (X), a second direction (Y) and a third direction (Z) intersecting each other, and the battery pack comprises: a battery cell (1) and a box body (2); The box body (2) comprises a frame body (21), a first pull bar (22), and a second pull bar (23); the frame body (21) comprises a first side (201) and a second side (202) arranged opposite to each other along the first direction (X); a receiving space is arranged in the frame body (21), and the battery cell (1) is arranged in the receiving space; The first pull bar (22) extends along the second direction (Y) and is connected to the first side (201) of the frame (21), and the first pull bar (22) is connected to the battery cell (1) to press the battery cell (1) from the first side (201) of the frame (21); the second pull bar (23) extends along the second direction (Y) and is connected to the second side (202) of the frame (21), and the second pull bar (23) is connected to the battery cell (1) to press the battery cell (1) from the second side of the frame (21).

2. The battery pack according to claim 1, characterized in that: The box body (2) further comprises a bottom plate (24), the bottom plate (24) being located on a side of the second pull bar (23) away from the battery cell (1) and connected to the frame body (21), the bottom plate (24) being in abutment with the second pull bar (23).

3. The battery pack according to claim 1, characterized in that: A buffer cavity (231) extending along the second direction (Y) is provided in the second pull bar (23).

4. The battery pack according to claim 3, characterized in that: The second pull bar (23) further comprises a reinforcing rib (232), wherein the reinforcing rib (232) extends along the second direction (Y), and the reinforcing rib (232) is connected to at least one cavity wall of the buffer cavity (231).

5. The battery pack according to claim 1, characterized in that: The battery pack further comprises a buffer member (3), wherein the buffer member (3) is arranged between the first pull bar (22) and the battery cell (1), and / or the buffer member (3) is arranged between the second pull bar (23) and the battery cell (1).

6. The battery pack according to claim 5, characterized in that: At least two limiting protrusions (4) are provided on a side of the first pull bar (22) close to the battery cell (1), and / or on a side of the second pull bar (23) close to the battery cell (1), a receiving groove (41) is formed between two adjacent limiting protrusions (4), and the buffer member (3) is arranged in the receiving groove (41).

7. The battery pack according to claim 1, characterized in that: The frame (21) comprises a front frame (211), a support beam (212), and a rear frame (213) which are arranged at intervals along the second direction (Y); The battery cell (1) is arranged between the support beam (212) and the rear frame (213), wherein two ends of the first pull bar (22) along the second direction (Y) and two ends of the second pull bar (23) along the second direction (Y) are respectively fixedly connected to the support beam (212) and the rear frame (213).

8. The battery pack according to claim 7, characterized in that: The frame (21) further comprises a boss (214), the boss (214) being connected to a side of the support beam (212) and / or the rear frame (213) close to the battery cell (1), and the second pull bar (23) being connected to the boss (214).

9. The battery pack according to claim 8, characterized in that: The boss (214) and the support beam (212) form an escape space, and / or the boss (214) and the rear frame (213) form an escape space, the escape space is located on a side of the boss (214) away from the first pull strip (22), and the second pull strip (23) is at least partially accommodated in the escape space.

10. The battery pack according to claim 1 or 8, characterized in that: The battery pack further comprises a mounting member (5), wherein the mounting member (5) is connected to the frame (21) and the mounting member (5) presses and fixes the second pull bar (23) to the frame (21).

11. The battery pack according to claim 10, characterized in that: The mounting member (5) comprises an extension portion (51) and a recessed portion (52), wherein the extension portion (51) is arranged on both sides of the recessed portion (52), the extension portion (51) is connected to the frame (21), and the recessed portion (52) is connected to the second pull bar (23).

12. The battery pack according to claim 1, characterized in that: The first pull bar (22) comprises a first section and a second section connected along the second direction (Y), the second section is connected to the first surface of the battery cell (1), and the first section is provided with an avoidance groove (221) on one side close to the second section.

13. The battery pack according to claim 10, characterized in that: The battery pack further comprises an adhesive component (6), and the second pull strip (23) is further provided with an adhesive groove (233), wherein the adhesive groove (233) is arranged on a side of the second pull strip (23) away from the battery cell (1) and is used to accommodate the adhesive component (6), and the adhesive component (6) is located between the mounting component (5) and the second pull strip (23) and bonds the mounting component (5) and the second pull strip (23).

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