Battery module and battery pack
Through the sleeve-shaped fixing structure and buffer design, the problems of battery cell misalignment and bus discharge damage during impact are solved, and the reliability and safety of the battery module are improved.
Patent Information
- Application Number
- CN202422388237.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-09-29
AI Technical Summary
When existing battery modules are impacted, the battery cells are easily misaligned, resulting in busbar damage, resulting in loss of function, capacity loss and safety hazards of the battery module.
The sleeve-shaped fixed structure is used to tighten the outside of the battery cell group and is bonded to the large surface of the battery cell. It combines the buffer and heat dissipation parts to enhance the fixing reliability and battery cell constraints.
Effectively avoid battery cell misalignment and bus discharge damage, ensure the reliability of the battery module function, prevent capacity loss and safety reduction, and improve the safety of the battery pack.
Smart Images
Figure CN223285163U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, and in particular to a battery module and a battery pack. Background Art
[0002] A battery module typically consists of multiple cells, which need to be stacked and secured before being placed in a housing. Existing battery modules place end plates at either end of the stacking direction, then secure the cells with metal ties wrapped around them. However, when impacted, these cells can easily become misaligned, damaging the cells and busbars connecting them. This can lead to loss of battery module functionality, overall battery pack capacity, decreased performance of electrical devices, and even safety concerns. Utility Model Content
[0003] The purpose of the utility model is to provide a battery module, wherein the fixing structure can well restrain each battery cell and avoid misalignment between the battery cells during a collision.
[0004] To achieve this purpose, the present invention adopts the following technical solutions:
[0005] The battery module includes:
[0006] A battery cell group, the battery cell group comprising a plurality of battery cells, the plurality of battery cells being stacked along a first direction, with a large surface of the battery cells being perpendicular to the first direction;
[0007] The fixing structure is sleeve-shaped, and its axis extends along the second direction, which is perpendicular to the first direction. The fixing structure is arranged on the outside of the battery cell group, and is adhesively connected to the large surfaces of the battery cells at both ends.
[0008] As an optional solution, along the second direction, the fixing structure is centrally arranged relative to the battery cell group.
[0009] As an optional solution, along the second direction, the ratio of the height of the fixing structure to the height of the battery cell is 1:(1.01-3).
[0010] As an optional solution, a plurality of through holes are provided on the fixing structure.
[0011] As an optional solution, along the second direction, the distribution density of the through holes at both ends of the fixing structure is smaller than the distribution density in the middle.
[0012] As an optional solution, the through holes are evenly distributed on the fixing structure.
[0013] As an optional solution, the fixing structure is made of a flexible material.
[0014] As an optional solution, the wall thickness of the fixing structure is 0.5-5 mm.
[0015] As an optional solution, the battery module further includes a buffer, which is sandwiched between two adjacent battery cells.
[0016] Another object of the present invention is to provide a battery pack that, by providing the above-mentioned battery module, can avoid cell dislocation or bus damage after a collision, thereby ensuring the normal function of the battery module and avoiding capacity loss.
[0017] To achieve this purpose, the present invention adopts the following technical solutions:
[0018] The battery pack comprises an outer box and the battery module, wherein the battery module is arranged in the outer box.
[0019] As an optional solution, the fixing structure is bonded to the inner wall of the outer box.
[0020] As an optional solution, the battery pack further includes:
[0021] A mounting structure capable of fixing the battery module in the outer box; and / or
[0022] The heat dissipation element is arranged between the battery module and the inner wall of the outer box.
[0023] The beneficial effects of the utility model are:
[0024] The battery module of the present invention increases the contact area between the fixed structure and the battery cell group by arranging a sleeve-shaped fixed structure to clamp the outer side of the battery cell group, thereby more reliably clamping each battery cell; at the same time, the fixed structure and the large surfaces of the battery cells at both ends of the battery cell group are arranged to be bonded and connected, which can further improve the connection reliability between the fixed structure and the battery cell group, and further improve the restraint reliability of the fixed structure on each battery cell, thereby avoiding the problems of misalignment between the battery cells and damage to the busbar when the battery module collides, thereby ensuring the reliability of the battery module function.
[0025] The battery pack of the present invention, by providing the above-mentioned battery module, can avoid problems such as capacity loss and performance degradation after being impacted, thereby ensuring the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 This is an exploded view of the battery pack provided in Example 1 of the present utility model;
[0027] Figure 2 This is a front view of the battery module provided in Example 1 of the present utility model;
[0028] Figure 3 This is a side view of the battery module provided in Example 1 of the present utility model;
[0029] Figure 4 This is a side view of a fixing structure provided in Example 1 of the present utility model;
[0030] Figure 5 This is an exploded view of the battery pack provided in the second embodiment of the present invention.
[0031] In the picture:
[0032] 100. Battery module;
[0033] 10. Battery cell group; 11. Battery cell;
[0034] 20. Fixing structure; 21. First side wall; 22. Second side wall; 23. Through hole;
[0035] 200, outer box; 201, box body; 202, box cover;
[0036] 300, mounting structure; 301, first mounting member; 302, second mounting member;
[0037] 400, insulation parts;
[0038] 500, heat sink;
[0039] 600. Control system. DETAILED DESCRIPTION
[0040] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.
[0041] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0042] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.
[0043] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.
[0044] like Figure 1 As shown, this embodiment provides a battery module 100, which includes a cell group 10 and a fixing structure 20. The cell group 10 includes a plurality of cells 11, which are stacked along a first direction, with the large surfaces of the cells 11 perpendicular to the first direction. The fixing structure 20 is sleeve-shaped, and its axis extends along a second direction, which is perpendicular to the first direction. The fixing structure 20 is clamped on the outside of the cell group 10, and the fixing structure 20 is adhesively connected to the large surfaces of the cells 11 at both ends. It should be noted that in this embodiment, the cell 11 is a square battery, and the large surface of the cell 11 refers to the side with the largest area of the cell 11. The first direction is the thickness direction of the cell 11, and the second direction is the height direction of the cell 11. In this embodiment, the cell 11 has a positive electrode column and a negative electrode column extending on the same side of the second direction. In other embodiments, the cell 11 has a positive electrode column and a negative electrode column extending on both sides of the second direction. The positive poles and negative poles of each battery cell 11 can be connected via a bus bar as needed, so that the multiple battery cells 11 are connected in series or in parallel.
[0045] The battery module 100 of this embodiment increases the contact area between the fixing structure 20 and the battery cell group 10 by providing a sleeve-shaped fixing structure 20 to clamp the outer side of the battery cell group 10, thereby more reliably clamping each battery cell 11; at the same time, the fixing structure 20 and the large surfaces of the battery cells 11 at both ends of the battery cell group 10 are provided to be bonded, which can further improve the connection reliability between the fixing structure 20 and the battery cell group 10, and further improve the restraint reliability of the fixing structure 20 on each battery cell 11, thereby avoiding the problem of misalignment between the battery cells 11 and damage to the busbar when the battery module 10 is collided, thereby ensuring the reliability of the function of the battery module 100.
[0046] like Figure 1 As shown, the fixing structure 20 includes two opposing first side walls 21 and two opposing second side walls 22. Each first side wall 21 is connected to two second side walls 22 at its ends along the first direction, thereby forming a sleeve shape extending axially along the second direction. In this embodiment, the first side walls 21 are opposite to the thickness direction of each battery cell 11, and each second side wall 22 is adhesively connected to the large surface of the corresponding battery cell 11.
[0047] Optionally, along the second direction, the ratio of the height of the fixing structure 20 to the height of the battery cell 11 is 1:(1.01-3). This arrangement further ensures that the fixing structure 20 has a sufficiently large contact area with the battery cell group 10, ensuring the reliability of the fixing structure 20 fixing the battery cell group 10. Preferably, along the second direction, the ratio of the height of the fixing structure 20 to the height of the battery cell 11 is 1:(1.25-2). Specifically, along the second direction, the ratio of the height of the fixing structure 20 to the height of the battery cell 11 can be 1:1.01, 1:1.25, 1:1.2, 1:3, etc., and is not specifically limited here.
[0048] like Figure 1-Figure 3 As shown, along the second direction, the fixing structure 20 is centered relative to the cell group 10. This arrangement centers the restraining force of the fixing structure 20 on the cell group 10, ensuring uniform force on the cell group 10 in the second direction, and further improving the reliability of the restraint of the fixing structure 20 on the cell group 10.
[0049] Optionally, the wall thickness of the fixing structure 20 is 0.5-5 mm. Setting the wall thickness of the fixing structure 20 within the above range can prevent the fixing structure 20 from being too thin and unable to reliably fix the battery cell group 10, and can also prevent the fixing structure 20 from being too thick and taking up too much space, thereby facilitating an increase in the energy density of the battery module 100. Preferably, the wall thickness of the fixing structure 20 is 2-3 mm. Optionally, the wall thickness of the fixing structure 20 can be 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm.
[0050] In this embodiment, the fixing structure 20 is made of a flexible material, which gives the fixing structure 20 a certain degree of elastic deformation capability. On the one hand, it can provide a better preload force to the battery cell group 10 before the battery cell group 10 expands. On the other hand, after the battery cell group 10 expands and deforms during the charging and discharging process, it can prevent the battery cells 11 from being subjected to excessive pressure, causing problems such as electrode breakage. Optionally, the fixing structure 20 is made of continuous fiber and resin pressed together. The fibers used include one or more of glass fiber, carbon fiber, and aramid fiber. This gives the fixing structure 20 high strength, excellent impact resistance, high tensile strength, and excellent puncture protection.
[0051] like Figure 2 and Figure 3 As shown, the fixing structure 20 is provided with a plurality of through-holes 23. The provision of through-holes 23 further enhances the elastic deformation capability of the fixing structure 20, preventing problems such as electrode breakage caused by excessive pressure on the battery cells 11. Furthermore, the provision of through-holes 23 reduces the weight of the fixing structure 20, thereby increasing the energy density of the battery module 100 and achieving lightweight requirements.
[0052] Since the battery cell group 10 expands mainly along the first direction, such as Figure 2 As shown, in some embodiments, the fixing structure 20 is provided with a through hole 23 on at least one second side wall 22. Of course, in some embodiments, the fixing structure 20 is provided with a through hole 23 on both the first side wall 21 and the second side wall 22.
[0053] In some embodiments, such as Figure 2 and Figure 3 As shown, the through holes 23 are evenly distributed on the fixing structure 20 , so that the strength of the fixing structure 20 is even, thereby ensuring that the battery cell group 10 is evenly fixed and constrained.
[0054] In some embodiments, such as Figure 4 As shown, along the second direction, the distribution density of the through holes 23 at the ends of the fixing structure 20 is lower than the distribution density in the middle. Since the battery cell group 10 expands as a whole, the expansion amount at the ends along the second direction is lower than the expansion amount in the middle. By setting the distribution of the through holes 23 so that the density at the ends along the second direction is lower than the density in the middle, the elastic deformation capacity of the fixing structure 20 at each location in the second direction is matched to the expansion amount of the battery cell group 10, thereby ensuring that the battery cell group 10 is evenly stressed when expanded.
[0055] The battery module 100 also includes a buffer member, which is sandwiched between two adjacent battery cells 11. This buffer member absorbs any expansion of the battery cells 11, preventing excessive pressure on the battery cells 11 and thus extending the lifespan of the battery module 100. In this embodiment, the buffer member is provided between each adjacent battery cell 11. Optionally, the buffer member can be a foam sheet.
[0056] like Figure 1 As shown, this embodiment further provides a battery pack, which includes an outer box 200 and the aforementioned battery module 100, wherein the battery module 100 is disposed within the outer box 200. By disposing the aforementioned battery module 100, the battery pack of this embodiment can avoid problems such as capacity loss and performance degradation after being impacted, and ensures the safety of the battery pack.
[0057] Specifically, the outer box 200 includes a box body 201 and a box cover 202. The box body 201 has an opening on one side, through which the battery module 100 can be loaded into the box body 201. The box cover 202 blocks the opening and is fixedly connected to the box body 201. Optionally, the box body 201 and the box cover 202 can be fixed by fasteners, threaded connection, welding, or other methods, which are not specifically limited here.
[0058] Optionally, the battery pack also includes a control system 600 that can effectively monitor, protect, balance energy, and provide fault alarms for the battery pack, thereby improving the overall efficiency and service life of the battery pack. The specific control system 600 can be any conventional method, and its specific structure and operating principle are not further described here.
[0059] like Figure 1 As shown, the fixing structure 20 is bonded to the inner wall of the outer box 200. This arrangement secures the battery module 100 to the outer box 200, preventing collisions between the battery module 100 and the outer box 200 after an impact. This, in turn, prevents capacity loss and performance degradation in the battery pack after an impact, thereby ensuring the safety of the battery pack. In this embodiment, one second side wall 22 of the fixing structure 20 is bonded to the inner wall of the outer box 200, and the control system 600 is disposed between the other second side wall 22 and the inner wall of the outer box 200.
[0060] like Figure 1As shown, the battery pack also includes a heat sink 500, which is arranged at both ends of the battery module 100 along the second direction. Specifically, one of the heat sinks 500 is arranged between the side of the battery cell 11 leading out the pole and the inner wall corresponding to the box 201, and the other heat sink 500 is arranged between the side of the battery cell 11 away from the pole and the inner wall corresponding to the box 201. The setting of the heat sink 500 can more quickly transfer the heat generated during the charging and discharging process of the battery cell 11 to the box 201, and then transfer it to the outside of the battery pack, so as to avoid the internal temperature of the battery pack being too high and causing damage to the battery cell 11 or thermal runaway. It can be understood that the material of the heat sink 500 can be any one of the existing technologies and is not specifically limited here.
[0061] Example 2
[0062] The battery pack provided in this embodiment differs from the battery pack in the first embodiment mainly in the connection method between the battery module 100 and the outer box 200, which is as follows:
[0063] like Figure 5 As shown, the battery pack also includes a mounting structure 300, which can fix the battery module 100 in the outer box 200, thereby preventing the battery module 100 and the outer box 200 from colliding with each other after the battery pack is hit, thereby preventing the battery pack from having problems such as capacity loss and performance degradation after the battery pack is hit, and ensuring the safety of the battery pack.
[0064] Specifically, if Figure 5 As shown, the mounting structure 300 includes two first mounting members 301 and two second mounting members 302. The two first mounting members 301 are disposed on either side of the battery module 100 along the first direction and are respectively fixed to the outer box 201 via fasteners. The two first mounting members 301 can clamp and secure the battery module 100 in the first direction. The two second mounting members 302 are spaced apart along the second direction, and each second mounting member 302 is connected to the two first mounting members 301 at both ends along the first direction via fasteners. The two second mounting members 302 press the battery module 100 against the bottom plate of the outer box 201 along a third direction, which is perpendicular to the first and second directions and is the width direction of the battery cell 11. The cooperation of the first mounting members 301 and the second mounting members 302 can reliably secure the battery module 100 within the outer box 200. In other embodiments, the number of second mounting members 302 can also be one, three, or more, which is not limited here. Optionally, the second mounting member 302 is constructed in a U-shape. In other implementations, the shape of the second mounting member 302 is not specifically limited, as long as it can be reliably connected to the first mounting member 301.
[0065] In this embodiment, the control system 600 is disposed between one of the first mounting members 301 and the inner wall of the box body 201 .
[0066] Preferably, in this embodiment, the battery pack further includes four insulating members 400. Two insulating members 400 are disposed on either side of the battery module 100 along the third direction, and the other two insulating members 400 are disposed on either side of the battery module 100 along the first direction. This arrangement prevents short circuits between the battery module 100 and the outer box 200 or the fixing structure 20, thereby improving the safety of the battery pack. It is understood that the material of the insulating members 400 can be any material known in the art and is not specifically limited herein.
[0067] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will, based on the concept of the present invention, vary the specific implementation methods and scope of application, and the contents of this specification should not be construed as limiting the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.
Claims
1. A battery module, characterized in that: include: A battery cell group (10), the battery cell group (10) comprising a plurality of battery cells (11), the plurality of battery cells (11) being stacked and arranged along a first direction, with a large surface of the battery cells (11) being perpendicular to the first direction; The fixing structure (20) is sleeve-shaped, and its axis extends along a second direction, the second direction being perpendicular to the first direction. The fixing structure (20) is arranged on the outside of the battery cell group (10), and the fixing structure (20) is adhesively connected to the large surfaces of the battery cells (11) at both ends.
2. The battery module according to claim 1, wherein: Along the second direction, the fixing structure (20) is centrally arranged relative to the battery cell group (10).
3. The battery module according to claim 1, wherein: Along the second direction, the ratio of the height of the fixing structure (20) to the height of the battery core is 1:(1.01-3).
4. The battery module according to any one of claims 1 to 3, wherein: The fixing structure (20) is provided with a plurality of through holes (23).
5. The battery module according to claim 4, wherein: Along the second direction, the distribution density of the through holes (23) at both ends of the fixed structure (20) is smaller than the distribution density in the middle; or The through holes (23) are evenly distributed on the fixing structure (20).
6. The battery module according to any one of claims 1 to 3, wherein: The wall thickness of the fixing structure (20) is 0.5-5 mm.
7. The battery module according to any one of claims 1 to 3, wherein: The battery module further comprises a buffer component, which is sandwiched between two adjacent battery cells (11).
8. A battery pack, characterized in that It comprises an outer box (200) and the battery module according to any one of claims 1 to 7, wherein the battery module is arranged in the outer box (200).
9. The battery pack according to claim 8, wherein: The fixing structure (20) is adhesively connected to the inner wall of the outer box (200).
10. The battery pack according to claim 8, wherein: The battery pack further includes: A mounting structure (300) capable of fixing the battery module in the outer box (200); and / or A heat dissipation member is arranged between the battery module and the inner wall of the outer box (200).