Fixing structure and battery module

Abstract

The utility model provides a fixing structure and battery module, wherein the fixing structure includes end plate, fixing band and adjusting component, the end plate is located in the end portion of the length direction of battery cell group, the battery cell group is located between the two end plate, the main function of the end plate is to provide stable structure support for the battery cell group, and the fixing band is fixed on the battery cell group. Therefore, the structural stability of the battery cell group during working is ensured, and the battery cell group can be protected from external impact and physical damage to a certain extent. The end plate is usually made of a high-strength material so as to ensure that the structural strength meets the requirement. And the fixing belt is configured to surround the outer sides of the end plate and the battery cell group, and is tightly propped against the end plate and the battery cell group so as to apply a certain tensile force to the end plate and the battery cell group to fix the battery cell group. The adjusting assembly comprises an adjusting piece and a baffle, the end of the adjusting piece penetrates through the end plate and is connected to the baffle, and the adjusting piece is controlled to adjust the distance between the end plate and the baffle so as to adjust the tensile force of the fixing belt.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field, concretely relates to a fixed knot and battery module. BACKGROUND

[0002] The common battery module fixing mode is that a fixed band of a size determined in advance surrounds a battery module, and the fixed band exerts a pre-tightening force on the battery module to fix the battery module. However, this fixing mode has the following defects: (1) due to the possible errors in the sizes of multiple battery cells and other components in the battery module, the battery module cannot be put into the fixed band of the size determined in advance; (2) the fixed battery module may swell during the charging and discharging process, and due to the weak elasticity of the fixed band, the fixed band cannot adaptively change its size, resulting in an increase in the pre-tightening force of the fixed band on the battery module, which may affect the performance and service life of the battery module, and even cause safety hazards. SUMMARY

[0003] Embodiments of the utility model provide a fixed knot and a battery module to solve the above defects in the battery module fixing mode in the related art.

[0004] In a first aspect, embodiments of the utility model provide a fixed knot for fixing a battery cell group, which comprises: an end plate configured to be located at an end of the battery cell group; a fixed band configured to surround the outside of the end plate and the battery cell group; and an adjusting assembly comprising an adjusting piece and a baffle; wherein the end of the adjusting piece passes through the end plate and is connected to the baffle, and the adjusting piece is used to adjust the distance between the end plate and the baffle to adjust the tension of the fixed band.

[0005] In an embodiment, the adjusting piece is screw-connected to the end plate.

[0006] In an embodiment, the adjusting piece comprises a bolt, a first nut and a second nut; wherein the first nut and the second nut are respectively located on the opposite sides of the end plate, the rotation directions of the inner threads of the first nut and the second nut are opposite, and the bolt passes through the first nut and the second nut.

[0007] In an embodiment, the adjusting piece is located at the center of the end plate.

[0008] In an embodiment, the number of fixed bands is 2, the two fixed bands are symmetric along the center line of the adjusting piece in the height direction of the end plate, and 3 / 7≤d / h≤5 / 7; wherein d is the distance between the two sides of the two fixed bands farthest from the adjusting piece, and h is the height of the end plate.

[0009] In an embodiment, the baffle is located between the end plate and the battery cell group.

[0010] In an embodiment, the middle part of the baffle plate is provided with a protruding part, the protruding part is located on the side of the baffle plate close to the end plate, and the adjusting member is connected to the protruding part.

[0011] In an embodiment, the baffle plate is provided with at least one limiting member, the end plate is provided with a limiting hole through which the limiting member passes, and the limiting hole is used for limiting the baffle plate.

[0012] In an embodiment, the fixing structure further comprises a pressure sensor, the pressure sensor is located between the adjusting member and the end plate, and is used for measuring the pressure applied by the adjusting member to the end plate.

[0013] In a second aspect, the embodiments of the utility model also provide a battery module which comprises the fixing structure of the first aspect.

[0014] The utility model provides a kind of fixing structure and battery module, wherein, fixing structure includes end plate, fixed band and adjusting assembly, end plate is located in the end of the length direction of electric core group, electric core group is located between two end plates, and the main function of end plate is to provide stable structure support for electric core group, to ensure the structural stability of electric core group when working, it can also protect electric core group from external impact and physical damage to some extent.Fixed band is configured to surround the outside of end plate and electric core group, and tightly abuts to end plate and electric core group, to exert certain tension on end plate and electric core group to fix electric core group.Adjusting assembly includes adjusting member and baffle plate, the end of adjusting member passes through end plate and is connected to baffle plate, and the spacing between end plate and baffle plate is adjusted by controlling adjusting member to adjust the tension of fixed band. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be simply introduced as follows, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0016] Figure 1 It is the structural schematic diagram of battery module provided by the utility model embodiment;

[0017] Figure 2 It is Figure 1 The structural schematic diagram of fixing structure in it;

[0018] Figure 3 It is Figure 2 The structural schematic diagram of adjusting member and end plate in it;

[0019] Figure 4 It is Figure 1 The side view of battery module in it;

[0020] Figure 5 It is Figure 3Structure schematic view of middle adjusting piece and baffle;

[0021] Mark explanation:

[0022] 100, fixing structure; 110, end plate; 120, fixing belt; 130, adjusting assembly; 131, adjusting piece; 132, baffle; 140, protruding part; 150, limiting piece; 200, battery module; 210, electric core group. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and the specific is the direction of the drawing in the drawings; and "inner" and "outer" are relative to the outline of the device.

[0024] In order to solve the above-mentioned defects existing in the battery module fixing mode in the related art, the embodiments of the present application provide a fixing structure 100 for fixing the electric core group 210, please refer to Figure 1 、 Figure 2 , Figure 1 is a structure schematic view of the battery module 200 provided by the embodiments of the present application, Figure 2is a structural schematic diagram of the fixing structure 100. The fixing structure 100 comprises an end plate 110, a fixing belt 120 and an adjusting assembly 130. The end plate 110 is located at the end of the length direction of the battery cell group 210, and the battery cell group 210 is located between the two end plates 110. The main function of the end plate 110 is to provide stable structural support for the battery cell group 210 to ensure the structural stability of the battery cell group 210 during work, and also to protect the battery cell group 210 from external impact and physical damage to a certain extent. The end plate 110 is usually made of high-strength material to ensure that its structural strength meets the requirements. The fixing belt 120 is configured to surround the outside of the end plate 110 and the battery cell group 210, and tightly abuts the end plate 110 and the battery cell group 210 to exert a certain tension on the end plate 110 and the battery cell group 210 to fix the battery cell group 210. The adjusting assembly 130 comprises an adjusting piece 131 and a baffle 132. The end of the adjusting piece 131 passes through the end plate 110 and is connected to the baffle 132. By controlling the adjusting piece 131 to adjust the distance between the end plate 110 and the baffle 132, the tension of the fixing belt 120 can be adjusted.

[0025] It is easy to understand that the area surrounded by the fixing belt 120 needs to be larger than the cross-sectional area of the battery cell group 210 to ensure that the battery cell group 210 can be fitted into the fixing belt 120. After the battery cell group 210 is fitted into the fixing belt 120, by controlling the adjusting assembly 130, i.e. adjusting the distance between the end plate 110 and the baffle 132, the tension of the fixing belt 120 can meet the requirements of fixing the end plate 110 and the battery cell group 210, while also avoiding the impact on the battery cell group 210 caused by excessive tension. During the charging and discharging process of the battery cell group 210, some battery cells may expand to a certain extent. In order to deal with this situation, the operator can appropriately reduce the distance between the end plate 110 and the baffle 132 to provide sufficient buffer space for the expansion of the battery cells, so that the fixing belt 120 can fix the end plate 110 and the battery cell group 210, while also avoiding the impact on the battery cell group 210 caused by the excessive tension of the fixing belt 120 due to the expansion of some battery cells, to ensure the overall stability and safety of the battery cell group 210.

[0026] In the embodiment, by adjusting the spacing between the end plate 110 and the baffle 132, the tension of the fixing belt 120 on the end plate 110 and the battery cell group 210 can be flexibly adjusted. Compared with the related art, in one aspect, the size of the fixing belt 120 provided by the embodiment can be pre-set to be relatively large, so that the battery cell group 210 can be flexibly placed in the fixing belt 120. This design aims to solve a common problem in the related art, that is, the sizes of the plurality of battery cells and other components in the battery cell group 210 are inconsistent due to manufacturing tolerances and other factors, ultimately leading to difficult assembly of the battery cell group 210. Through this pre-set loose design, the operator can more conveniently place the battery cell group 210 in place when assembling the battery cell group 210, and then adjust the tension of the fixing belt 120 on the end plate 110 and the battery cell group 210 by controlling the adjusting assembly 130 after the battery cell group 210 is assembled, to ensure the structural stability of the battery cell group 210, thereby improving the overall assembly efficiency.

[0027] On the other hand, as the battery cell group 210 undergoes multiple charge and discharge cycles, some battery cells may expand. To address this issue, the fixing structure 100 provided by the embodiment can give the battery cells a certain buffer space by moderately reducing the spacing between the end plate 110 and the baffle 132. This design not only effectively prevents the fixing belt 120 from exerting excessive tension on the battery cell group 210, thereby reducing the risk of damage to the battery cell group 210, but also ensures that the battery cells have enough space to change freely when they expand, thereby maintaining the safety and stability of the battery system.

[0028] In some embodiments, the adjusting piece 131 is threadedly connected to the end plate 110. The adjusting piece 131 and the end plate 110 are threadedly engaged with each other, wherein the adjusting piece 131 can be provided with external threads and the end plate 110 can be provided with internal threads, or the adjusting piece 131 can be provided with internal threads and the end plate 110 can be provided with external threads. For ease of description, the embodiments of the utility model all adopt the design that the adjusting piece 131 is provided with external threads and the end plate 110 is provided with internal threads.

[0029] Specifically, the adjusting member 131 can rotate relative to the end plate 110, so that the adjusting member 131 can move forward or backward along the central axis of the adjusting member 131 relative to the end plate 110. Since the end of the adjusting member 131 is connected to the baffle plate 132, the adjusting member 131 can push the baffle plate 132 to move away from the end plate 110 to increase the distance between the baffle plate 132 and the end plate 110, thereby increasing the tension of the fixing belt 120 on the end plate 110 and the battery cell group 210. The adjusting member 131 can also pull the baffle plate 132 to move close to the end plate 110 to reduce the distance between the baffle plate 132 and the end plate 110, thereby reducing the tension of the fixing belt 120 on the end plate 110 and the battery cell group 210. Through the threaded connection structure between the adjusting member 131 and the end plate 110 in this embodiment, the fixing structure 100 provided in this embodiment can realize flexible adjustment of the tension of the fixing belt 120.

[0030] In some embodiments, the adjusting member 131 includes a bolt, a first nut and a second nut. Specifically, the bolt passes through the first nut, the end plate 110 and the second nut in sequence, and is then connected to the baffle plate 132. The first nut and the second nut are respectively located on opposite sides of the end plate 110, and the rotation directions of the inner threads of the first nut and the second nut are opposite.

[0031] In this embodiment, by designing the inner threads of the first nut and the second nut to be opposite, the stability of the adjusting member 131 can be effectively enhanced. After the adjusting member 131 adjusts the distance between the end plate 110 and the baffle plate 132, the operator rotates the first nut and the second nut respectively, so that the first nut and the second nut approach each other until they abut against the end plate 110 and are tightened. The advantage of this structure design is that it can effectively prevent the bolt from loosening due to vibration or external impact.

[0032] In some embodiments, reference can be made to Figure 3 , Figure 3 is Figure 2 the structure diagram of the adjusting member 131 and the end plate 110 in the above embodiment. The adjusting member 131 is located at the center of the end plate 110. Among them, the center part of the end plate 110 is provided with a threaded hole for the adjusting member 131 to pass through, and the central axis of the adjusting member 131 is parallel to the thickness direction of the end plate 110. Specifically, during the working process of the battery cell group 210, some battery cells may expand due to heat or other factors, and the deformation degree of the central part is usually more obvious. In this embodiment, the adjusting member 131 passes through the center part of the end plate 110, so that the end of the adjusting member 131 is connected to the center part of the baffle plate 132. This structure design enables the center part of the baffle plate 132 to exert a greater extrusion force on the battery cell group 210, which can to some extent reduce the expansion deformation degree of the battery cell group 210.

[0033] The number of fixing straps 120 has a significant impact on the fixing effect of the battery cell assembly 210. Generally, as the number of fixing straps 120 increases, the tension applied to the battery cell assembly 210 can be more evenly distributed, effectively reducing the risk of displacement or deformation during use and thus improving the fixing effect. However, as the number of fixing straps 120 increases, the improvement in the fixing effect of the battery cell assembly 210 tends to gradually decrease. Furthermore, increasing the number of fixing straps 120 may significantly increase assembly difficulty, leading to longer assembly time and reduced production efficiency. Secondly, the material cost of the fixing structure 100 also increases with the number of fixing straps 120.

[0034] To ensure effective fixation of the battery cell assembly 210 while controlling assembly difficulty and material costs, in some embodiments, reference can be made to... Figure 2 , Figure 4 The number of fixing straps 120 is set to two. The two fixing straps 120 are spaced apart along the height direction of the cell assembly 210 and symmetrically arranged along the center line of the adjusting member 131 along the height direction of the end plate 110. Furthermore, in this structure, the distance d between the two fixing straps 120 and the height h of the end plate 110 have the following relationship: 3 / 7 ≤ d / h ≤ 5 / 7. Experiments have shown that this proportional relationship ensures that the fixing straps 120 have a significant effect on the cell assembly 210, effectively resisting cell expansion and deformation, and avoiding stress concentration due to excessively tight spacing between the two fixing straps 120, which could affect cell performance. This structural design ensures effective fixation of the cell assembly 210 while reducing assembly difficulty and material costs.

[0035] In some embodiments, please refer to Figure 3 A baffle 132 is disposed between the end plate 110 and the cell assembly 210. Specifically, the side of the baffle 132 facing away from the cell assembly 210 is connected to the adjusting member 131. Therefore, when the adjusting member 131 is moved, the position of the baffle 132 also changes, thereby changing the distance between the baffle 132 and the end plate 110, ultimately adjusting the tension of the fixing belt 120 to fix the cell assembly 210. In addition, the baffle 132 also helps to distribute the pressure applied to the cell assembly 210, avoiding cell deformation or damage caused by uneven pressure.

[0036] In some embodiments, please refer to Figure 5 , Figure 5 yes Figure 3The structure diagram of the middle adjusting part 131 and the baffle 132, the middle part of the baffle 132 is provided with a protruding part 140, which is located on the side of the baffle 132 close to the end plate 110. This structure design aims to enhance the overall structural strength of the baffle 132, and the adjusting part 131 can effectively transmit the adjusting force by being connected to the protruding part 140 of the baffle 132, thereby ensuring that the baffle 132 can stably perform its function.

[0037] When the battery cell group 210 is working, some battery cells will swell due to temperature changes or electrochemical reactions, and in general, the middle part of the battery cell is the position where the swelling is most significant. To deal with this situation, the present embodiment increases the anti-deformation ability of the baffle 132 by providing a protruding part 140 in the middle part of the baffle 132. This protruding part 140 not only provides additional support force for the baffle 132, but also can absorb and disperse part of the stress when the battery cell swells, reducing its direct impact on the baffle 132. By connecting the adjusting part 131 to the protruding part 140 of the baffle 132, the flexibility and accuracy of the adjustment can be further improved. During the adjustment process, the movement of the adjusting part 131 will change the distance between the baffle 132 and the end plate 110, to ensure that the tension of the fixing belt 120 remains within a suitable range. Even when the battery cell swells to a large extent, the baffle 132 can still maintain the integrity of the structure, avoiding damage or failure due to stress concentration.

[0038] In summary, by providing a protruding part 140 in the middle part of the baffle 132 and connecting the adjusting part 131 to this part, the structural strength and stability of the baffle 132 can be effectively improved, thereby enhancing the safety and reliability of the battery cell group 210.

[0039] In some embodiments, the baffle 132 is provided with at least one limiting part 150, and the position opposite to each limiting part 150 of the end plate 110 is provided with a corresponding limiting hole. The function of the limiting hole is to effectively limit the position of the baffle 132. Specifically, at least a part of each limiting part 150 is located inside the limiting hole, and when adjusting the distance between the baffle 132 and the end plate 110, the limiting part 150 located on the baffle 132 can be extended or withdrawn relative to the limiting hole. This design makes the baffle 132 only able to move in the length direction of the limiting part 150, thereby avoiding displacement of the baffle 132 in other directions. Through this structural design, it can be ensured that the baffle 132 is not easily displaced by external forces during work, thereby ensuring the stability of the fixing structure 100. Preferably, the baffle 132 is provided with four limiting parts 150, and the center of the area surrounded by the four limiting parts 150 on the baffle 132 overlaps with the center of the baffle 132. At this time, the baffle 132 is not easily displaced in the length direction or height direction of the baffle 132, which can better ensure the stability of the fixing structure 100.

[0040] In some embodiments, the fixing structure 100 further comprises a pressure sensor located between the adjusting member 131 and the end plate 110. The main function of the pressure sensor is to measure the pressure exerted by the adjusting member 131 on the end plate 110 in real time. Through this real-time monitoring, the operator can adjust the distance between the baffle 132 and the end plate 110 by controlling the adjusting member 131 according to the feedback data of the pressure sensor, to ensure that the tensioning force exerted by the fixing belt 120 on the battery cell group 210 remains within a suitable range. This control of tensioning force not only prevents the battery cell group 210 from loosening or shifting due to insufficient tension, but also avoids damage or stress concentration caused by excessive tensioning force, thereby ensuring the overall safety of the battery cell group 210.

[0041] In addition, the use of the pressure sensor can also improve the accuracy and efficiency of the operation, so that the operator can quickly adjust the tensioning force exerted by the fixing belt 120 on the battery cell group 210 under different working conditions. By conveniently monitoring the pressure exerted by the adjusting member 131 on the end plate 110, the operator can control the fixing structure 100 to achieve better fixing effect, to ensure the stability and reliability of the battery cell group 210 during use. This design not only improves the safety of the battery cell group 210, but also enhances the reliability of the fixing structure 100.

[0042] The utility model provides a kind of fixed structure 100, fixed structure 100 includes end plate 110, fixed band 120 and adjusting assembly 130, end plate 110 is located at the end of the length direction of electric core group 210, electric core group 210 is located between two end plates 110, the main function of end plate 110 is to provide stable structure support for electric core group 210, to ensure the structural stability of electric core group 210 when working, also can protect electric core group 210 from external impact and physical damage to some extent.End plate 110 is usually made of high-strength material to ensure that its structural strength meets the demand.Fixed band 120 is configured to surround the outside of end plate 110 and electric core group 210, and tightly abuts end plate 110 and electric core group 210, to exert certain tension on end plate 110 and electric core group 210 to fix electric core group 210.Adjusting assembly 130 includes adjusting piece 131 and baffle 132, the end of adjusting piece 131 passes through end plate 110 and is connected to baffle 132, and the spacing between end plate 110 and baffle 132 is adjusted by controlling adjusting piece 131 to adjust the tension of fixed band 120.By adjusting the spacing between end plate 110 and baffle 132, the operator can flexibly adjust the tension of fixed band 120 on end plate 110 and electric core group 210.Compared with related art, in one aspect, the size of fixed band 120 provided by the embodiment can be pre-set relatively large, so that electric core group 210 can be flexibly placed in fixed band 120.This design aims to solve a common problem in related art, that is, the size of multiple electric cores and other components in electric core group 210 is inconsistent due to manufacturing tolerance and other factors, ultimately leading to difficult assembly of electric core group 210.Through this pre-set loose design, the operator can more conveniently place electric core group 210 in place when assembling electric core group 210, and then adjust the tension of fixed band 120 on end plate 110 and electric core group 210 by controlling adjusting assembly 130 after electric core group 210 is assembled, to ensure the structural stability of electric core group 210, thereby improving the overall assembly efficiency.

[0043] The utility model also provides a kind of battery module 200, battery module 200 includes the fixed structure 100 described above, while battery module 200 also has the beneficial effects of the fixed structure 100 described above, which will not be described here.

[0044] The above embodiments of the utility model are described in detail, and the principles and implementation modes of the utility model are described by applying specific examples in this paper.The above embodiment description is only used to help understand the method and core idea of the utility model;Meanwhile, for those skilled in the art, according to the idea of the utility model, the specific implementation mode and application range will be changed, and the above description should not be understood as a limitation of the utility model.

Claims

1. A fixing structure for fixing a group of battery cells, characterized by comprising: a fixing member for fixing the group of battery cells; and a fixing member for fixing the fixing member. The fixing structure comprises: an end plate configured to be located at an end of the group of battery cells; a fixing belt configured to encircle an outer side of the end plate and the group of battery cells; and an adjusting assembly comprising an adjusting member and a baffle plate; wherein an end of the adjusting member passes through the end plate and is connected to the baffle plate, the adjusting member is used to adjust the distance between the end plate and the baffle plate, so as to adjust the tension of the fixing belt. The adjusting member is threadedly connected to the end plate.

2. The fixing structure according to claim 1, characterized in that, The adjusting member comprises a bolt, a first nut and a second nut; wherein the first nut and the second nut are respectively located on opposite sides of the end plate, the internal threads of the first nut and the second nut are in opposite directions, and the bolt passes through the first nut and the second nut.

3. The fixing structure according to claim 2, characterized in that The adjusting member is located at the center of the end plate.

4. The fixing structure according to claim 3, characterized in that The number of the fixing belts is 2, and the two fixing belts are symmetric along the center line of the adjusting member in the height direction of the end plate, 3 / 7≤d / h≤5 / 7; wherein d is the distance between the two sides of the two fixing belts far away from the adjusting member, and h is the height of the end plate.

5. The fixture of claim 4, wherein The baffle plate is located between the end plate and the group of battery cells.

6. The fixture of any one of claims 1-5, wherein, The middle part of the baffle plate is provided with a protruding part, the protruding part is located on the side of the baffle plate close to the end plate, and the adjusting member is connected to the protruding part.

7. The fixture of any one of claims 1-5, wherein, The baffle plate is provided with at least one limiting member, and the end plate is provided with a limiting hole through which the limiting member passes, for limiting the baffle plate.

8. The fixture of any one of claims 1-5, wherein, Further comprising a pressure sensor located between the adjusting member and the end plate, for measuring the pressure exerted by the adjusting member on the end plate.

9. The fixture of any one of claims 1-5, wherein, The fixing structure comprises the fixing structure according to any one of claims 1-9.

10. A battery module, characterized by ​

Images