Battery pack

Abstract

The battery pack comprises a plurality of battery cells, a support and a thermosensitive wire, the plurality of battery cells are sequentially arranged together along the thickness direction of the battery cells, the support comprises a supporting part and a plurality of connecting parts, the plurality of connecting parts are embedded in the supporting part, each connecting part is provided with a connecting surface connected with the battery cells and a mounting surface positioned on the opposite side of the connecting surface, and the thermosensitive wire is arranged on the mounting surface. A plurality of columns of connecting parts are arranged in the direction perpendicular to the width direction of the battery cell, the connecting parts in each column are distributed at intervals in the width direction of the battery cell, a wiring groove is formed in the side, close to the mounting surface, of the supporting part and between every two adjacent columns of connecting parts, and the thermosensitive wire is arranged in the wiring groove, fixedly connected with the supporting part and used for responding to fire behavior to activate the fire extinguishing device. The utility model aims to optimize the arrangement of thermosensitive lines in a battery structure so as to realize quick response to thermal runaway.

Description

Technical Field

[0001] This utility model relates to the field of battery safety technology, and in particular to a battery pack. Background Technology

[0002] With the rapid development of the new energy industry, batteries are widely used in electric vehicles, energy storage systems, and consumer electronics. However, due to the inherent chemical properties of batteries, thermal runaway can easily occur under conditions of overcharging, over-discharging, battery damage, or other abnormalities, potentially leading to fires or explosions and posing a serious threat to equipment and personnel. Therefore, battery safety has always been a hot topic in battery technology research.

[0003] In existing technologies, temperature anomalies are often detected by using a thermally sensitive wire. The thermally sensitive wire is a response component used to spontaneously combust when the battery cell experiences thermal runaway to a certain temperature or an open flame appears. After burning out, it triggers a fire extinguishing device to spray extinguishing agent. Its placement directly affects the response speed and accuracy of thermal runaway. However, in existing battery structures, the thermally sensitive wire is usually placed on top of the battery box cover, around the cover, without direct contact with the battery cell. Furthermore, the top and side insulating sheets above the battery cell provide flame retardancy, resulting in slow temperature / open flame transmission during thermal runaway. The thermally sensitive wire cannot immediately detect temperature changes and initiate spontaneous combustion or detect an open flame.

[0004] Therefore, optimizing the arrangement of thermal lines in the battery structure to achieve rapid detection of thermal runaway has become an urgent problem to be solved. Utility Model Content

[0005] One objective of this invention is to provide a battery pack that addresses the technical problem of optimizing the arrangement of thermal lines in the battery structure to achieve rapid detection of thermal runaway.

[0006] To achieve the above objectives, the present invention provides the following solution: a battery pack comprising multiple battery cells arranged sequentially along their thickness direction; a support frame comprising a support portion and multiple connecting portions, the connecting portions being embedded in the support portion, each connecting portion having a connecting surface for connecting with the battery cells and a mounting surface located on the opposite side of the connecting surface; multiple rows of connecting portions arranged perpendicular to the width direction of the battery cells, with the connecting portions in each row spaced apart along the width direction of the battery cells; a wiring groove formed between adjacent rows of connecting portions on the side of the support portion near the mounting surface; and a thermal wire disposed within the wiring groove, the thermal wire being fixedly connected to the support portion for activating a fire extinguishing device in response to a fire.

[0007] Optionally, the battery cell also includes an explosion-proof valve, which is located on the side of the battery cell near the bracket. The support portion has clearance holes distributed in the wiring groove. The explosion-proof valve and the clearance holes at least partially overlap in the height direction of the battery cell.

[0008] Optionally, the projection of the thermal line on the support and the projection of the explosion-proof valve on the support do not coincide.

[0009] Optionally, the thermal wire includes a first thermal wire and a second thermal wire, both of which extend along the width direction of the battery cell, and are located on both sides of the explosion-proof valve.

[0010] Optionally, the thermal wire includes a first thermal wire and a second thermal wire. The first thermal wire includes multiple first sub-wires, which are arranged along the width direction of the battery cell and are alternately distributed on both sides of the explosion-proof valve near the connection part. The second thermal wire includes multiple second sub-wires, which are arranged perpendicular to the width direction of the battery cell and connected to adjacent first sub-wires.

[0011] Optionally, the first thermal wire and the second thermal wire are integrally formed, and multiple alternating first and second sub-wires are formed by bending.

[0012] Optionally, the support portion has multiple sets of fixing holes located in the wiring groove. Each set of fixing holes includes a first fixing hole and a second fixing hole, which are located on both sides of the thermal wire, respectively, for fasteners to fix the thermal wire.

[0013] Optionally, the bracket also includes multiple sets of fixing blocks, which are fixedly connected to the support and located in the cable tray. Each set of fixing blocks includes a first fixing block and a second fixing block, which are located on both sides of the thermal wire to clamp and fix the thermal wire.

[0014] Optionally, the battery cell also includes a terminal post, which is disposed on the side of the battery cell near the bracket. The bracket has a positioning hole on the side near the battery cell, and the positioning hole matches the shape of the terminal post for insertion and fixation.

[0015] Optionally, the outer periphery of the pole post is provided with an annular groove, and the inner wall of the positioning hole is provided with a protrusion structure that cooperates with the annular groove, and the annular groove and the protrusion structure are mechanically interlocked.

[0016] The beneficial effects of this utility model are as follows:

[0017] Unlike existing technologies that place the thermal sensing wires on the battery periphery, this application optimizes the battery support structure by arranging multiple connecting parts in rows and forming wiring channels between the rows. The thermal sensing wires are integrated into these channels, significantly shortening the distance between the thermal sensing wires and the battery cell structure. This allows the thermal sensing wires to be placed closer to the battery cell and its critical components (such as explosion-proof valves). This arrangement, close to critical areas, ensures that the thermal sensing wires can respond immediately in the event of thermal runaway or fire, thereby quickly activating the fire extinguishing device and improving the response speed and accuracy in the event of thermal runaway. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the battery pack provided in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the bracket and thermal wire provided in this embodiment of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the bracket and the back side of the thermal wire provided in this embodiment of the utility model;

[0022] Figure 4 This is a schematic diagram of another bracket and thermal wire provided in an embodiment of the present invention;

[0023] Figure 5 This is provided by the embodiment of the present utility model. Figure 1 Cross-sectional view along the AA direction;

[0024] Figure 6 This is provided by the embodiment of the present utility model. Figure 5 A magnified view of a portion of region A in the middle;

[0025] Figure 7 This is provided by the embodiment of the present utility model. Figure 5 A magnified view of a portion of region B in the middle.

[0026] Explanation of icon numbers:

[0027] 10. Battery cell; 11. Explosion-proof valve; 12. Terminal post; 20. Bracket; 21. Support part; 22. Connecting part; 23. Cable routing groove; 24. Clearance hole; 25. Fixing hole; 251. First fixing hole; 252. Second fixing hole; 26. Fixing block; 261. First fixing block; 262. Second fixing block; 27. Positioning hole; 30. Thermal wire; 31. First thermal wire; 311. First sub-wire; 32. Second thermal wire; 321. Second sub-wire. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1 to 3 , Figure 1 This is a schematic diagram of the battery pack provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of the bracket 20 and the thermal wire 30 provided in this embodiment of the utility model. Figure 3 This is a schematic diagram of the structure of the support 20 and the back side of the thermal wire 30 provided in this embodiment of the utility model.

[0030] This utility model provides a battery pack that optimizes the arrangement of the thermal wires 30 in the battery structure, achieving a rapid and accurate response to thermal runaway and effectively improving battery safety performance. The battery pack consists of multiple battery cells 10, a support frame 20, and thermal wires 30, wherein the multiple battery cells 10 are arranged sequentially along their thickness direction to form a compact structural layout.

[0031] The bracket 20 serves as a fixing and supporting component for the battery cell 10, comprising a support portion 21 and multiple connecting portions 22. Multiple connecting portions 22 are embedded in the support portion 21, which provides support. Each connecting portion 22 has a connecting surface for connecting to the battery cell 10 and a mounting surface located opposite the connecting surface. The battery cell 10 is connected to the connecting portion 22 via the connecting surface. Multiple rows of connecting portions 22 are arranged perpendicular to the width of the battery cell 10, with each row containing connecting portions 22 spaced apart along the width of the battery cell 10, forming a multi-row structural layout. On the side of the support portion 21 closest to the mounting surface, a wiring groove 23 is formed between adjacent rows of connecting portions 22, thus providing space for the proper arrangement of the thermal wire 30.

[0032] The thermal wire 30, as a key response component, is arranged along the wiring groove 23 and fixedly connected to the support part 21 of the bracket 20. The thermal wire 30 can be closely attached to the critical area of ​​the battery to directly sense the temperature changes generated during battery operation, thereby achieving a rapid and accurate response to fire.

[0033] In this embodiment, the present application optimizes the structure of the battery bracket 20 by arranging multiple connecting parts 22 in rows and forming wiring grooves 23 in the intervals between rows, and integrating the thermal wire 30 in the wiring grooves 23. Compared with the prior art where the thermal wire 30 is arranged around the battery, the distance between the thermal wire 30 and the battery cell 10 structure is significantly shortened in this application, allowing the thermal wire 30 to be closer to the battery cell 10 and its key components (such as the explosion-proof valve 11). This arrangement close to the critical area ensures that the thermal wire 30 can respond and melt immediately when the battery experiences thermal runaway or fire, thereby quickly issuing an alarm to activate the fire extinguishing device, improving the response speed and accuracy of thermal runaway detection.

[0034] In addition, this application ensures that the thermal line 30 is properly wired, while also effectively avoiding obstruction or interference from other structures, ensuring that the thermal line 30 can work stably and is not prone to performance degradation or detection delay due to external factors.

[0035] In some embodiments, the battery cell 10 further includes an explosion-proof valve 11. As an important pressure relief component when battery thermal runaway occurs, the explosion-proof valve 11 can release high-temperature gas when the internal pressure of the battery cell 10 rises rapidly, thereby preventing the overall battery pack structure from bursting due to excessive internal pressure.

[0036] Specifically, the explosion-proof valve 11 is located on the side of the battery cell 10 closest to the bracket 20, i.e., in the area directly adjacent to the bracket 20. To accommodate the arrangement of the explosion-proof valve 11, a clearance hole 24 is provided on the support part 21. The clearance hole 24 is positioned opposite to the explosion-proof valve 11. In the height direction of the battery cell 10, the explosion-proof valve 11 and the clearance hole 24 at least partially overlap and are distributed within the range of the wiring groove 23. The explosion-proof valve 11 can pass through the clearance hole 24, avoiding interference between the explosion-proof valve 11 and the bracket 20, and improving the overall structure and functional coordination of the battery pack.

[0037] In this embodiment, the spatial fit between the explosion-proof valve 11 and the clearance hole 24 of the bracket 20 ensures that the explosion-proof valve 11 operates normally without obstruction, while also providing favorable conditions for the arrangement of the thermal wire 30. Since the explosion-proof valve 11 passes directly through the clearance hole 24, the thermal wire 30 can be closer to the high-temperature area where the explosion-proof valve 11 is located, thereby quickly sensing temperature changes in the early stages of thermal runaway. This structural improvement significantly enhances the safety of the battery pack, ensuring timely warning and protective measures in the event of thermal runaway, further reducing the risk of fire or explosion.

[0038] Furthermore, to ensure that the arrangement of the thermal wire 30 achieves efficient fire detection without affecting the normal operation of the explosion-proof valve 11, the projection of the thermal wire 30 on the support 21 and the projection of the explosion-proof valve 11 on the support 21 are designed not to overlap. In other words, the arrangement of the thermal wire 30 is rationally planned so that it is located in the lateral area of ​​the explosion-proof valve 11, rather than directly overlapping or intersecting with the explosion-proof valve 11.

[0039] In this embodiment, by employing a non-overlapping layout, the thermal wire 30 is arranged to the side of the explosion-proof valve 11. This effectively avoids spatial interference between the two, ensuring that the explosion-proof valve 11 can smoothly activate when the pressure is too high, quickly releasing the high-temperature, high-pressure gas inside the battery cell 10, without affecting its function due to obstruction or compression by the thermal wire 30. Simultaneously, it also prevents the explosion-proof valve 11 from damaging the thermal wire 30 during the release of high-temperature gas, extending the service life of the thermal wire 30.

[0040] In some embodiments, please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of the bracket 20 and the thermal wire 30 provided in this embodiment of the utility model. To further enhance the detection accuracy and response capability for battery thermal runaway, the thermal wire 30 adopts a dual-wire layout, including a first thermal wire 31 and a second thermal wire 32. Both the first thermal wire 31 and the second thermal wire 32 extend along the width direction of the battery cell. Figure 2 The Y direction shown is the width direction of the battery cell. Simultaneously, a first thermal line 30 and a second thermal line 32 are located on both sides of the explosion-proof valve 11, arranged in a parallel configuration. That is, the first thermal line 31 and the second thermal line 32 are arranged parallel to each other on both sides of the explosion-proof valve 11, forming a symmetrical and efficient thermal monitoring layout.

[0041] In this embodiment, by arranging the first thermal line 31 and the second thermal line 32 on both sides of the explosion-proof valve 11, a larger temperature monitoring range can be covered, effectively improving the ability to detect temperature changes in the early stages of thermal runaway. Regardless of which side of the explosion-proof valve 11 the fire occurs on, it can be promptly captured by the adjacent thermal line 30, thereby ensuring the comprehensiveness and timeliness of fire detection.

[0042] Secondly, the thermal wires 30 are arranged parallel to the width of the battery cell, i.e., the extension direction of the wiring groove 23, making the layout simpler and more orderly, facilitating manufacturing and assembly, and reducing interference and complexity during the wiring process. While improving detection sensitivity, this also avoids signal interference problems caused by the crossing or overlapping of the thermal wires 30, thus enhancing the stability and reliability of the system.

[0043] Furthermore, the first thermal wire 31 and the second thermal wire 32, located on either side of the explosion-proof valve 11, provide redundant protection during battery pack operation. When one thermal wire 30 fails due to external environmental factors or accidental causes, the other thermal wire 30 can still operate normally, thereby maintaining the continuity of the thermal runaway detection function and further improving the safety performance of the battery pack.

[0044] In other embodiments, please refer to Figure 4 , Figure 4 This is a schematic diagram of another bracket 20 and thermal wire 30 provided in this embodiment of the present invention. To further optimize the wiring method of the thermal wire 30 and improve the coverage and sensitivity of temperature monitoring, another wiring method is adopted. Specifically, the thermal wire 30 still includes a first thermal wire 31 and a second thermal wire 32, but its layout differs from the aforementioned embodiment. The first thermal wire 31 includes multiple first sub-wires 311, and the second thermal wire 32 includes multiple second sub-wires 321. The multiple first sub-wires 311 are all arranged along the width direction of the battery cell 10, while the multiple second sub-wires 321 are all arranged perpendicular to the width direction of the battery cell 10, thereby achieving cross-wiring in two-dimensional space. Figure 4 The Y direction shown is the width direction of cell 10, and the X direction is perpendicular to the width direction of cell 10.

[0045] In this wiring scheme, the first sub-wire 311 is mainly distributed on both sides of the explosion-proof valve 11 near the connection part 22, alternating along the width direction of the battery cell 10, and closely attached to the critical area near the explosion-proof valve 11. The second sub-wire 321 is distributed between adjacent explosion-proof valves 11 and connects to the adjacent first sub-wire 311 along a direction perpendicular to the width direction of the battery cell 10. With this layout, the thermal wire 30 extends in an "S" shape around the multiple explosion-proof valves 11 spaced apart in the extension direction of the wiring trough 23, forming a continuous temperature monitoring network.

[0046] In this embodiment, the cable tray 23 has high space utilization, and the thermal wire 30 can cover multiple areas around the explosion-proof valve 11, forming a temperature change capture network. Furthermore, since the first sub-wire 311 and the second sub-wire 321 are arranged in different directions, signal interference caused by overlapping or close proximity of cables can be effectively avoided, improving detection accuracy. In addition, the second sub-wire 321 connects adjacent first sub-wires 311 into a continuous signal transmission channel, ensuring that the temperature detection signal can be quickly transmitted to the monitoring system, reducing detection delay.

[0047] Furthermore, to optimize the problem of traditional split-type thermal wires 30 being susceptible to fracture failure due to mechanical vibration at welded joints, in some embodiments, the first thermal wire 31 and the second thermal wire 32 are designed as a single-piece structure. Alternating first sub-wires 311 and second sub-wires 321 are formed by bending. Specifically, the first sub-wires 311 are alternately arranged on both sides of the explosion-proof valve 11 near the connection portion 22, while the second sub-wires 321 connect to adjacent first sub-wires 311. This structure eliminates physical connection points, avoiding the risk of fracture that may result from welding or other connection methods, thereby significantly improving the fatigue strength and long-term stability of the circuit.

[0048] In this embodiment, a continuous bending process is employed, enabling the first thermal wire 31 and the second thermal wire 32 to be formed simultaneously, creating a seamless thermal circuit. This process integrates the thermal wires 30 in both directions, constructing an uninterrupted path, eliminating connection points, improving the overall structural strength of the circuit, and enhancing the system's reliability during long-term use.

[0049] In some embodiments, please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the bracket 20 and the thermal wire 30 provided in this embodiment of the utility model. Figure 3 This is a schematic diagram of the structure of the bracket 20 and the back side of the thermal wire 30 provided in this embodiment of the utility model. In order to improve the arrangement stability of the thermal wire 30 and its reliability during operation, the support part 21 is provided with multiple sets of fixing holes 25. The fixing holes 25 are for fasteners to pass through and fix the thermal wire 30. The fasteners cooperate with the fixing holes 25 to keep the thermal wire 30 in a stable position during the wiring process and effectively prevent the thermal wire 30 from loosening or shifting due to vibration, thermal expansion or external force.

[0050] Specifically, each set of fixing holes 25 includes a first fixing hole 251 and a second fixing hole 252, which are located on both sides of the thermal wire 30, forming a symmetrical distribution structure. The thermal wire 30 can be securely fixed to the surface of the support 21 by fasteners (such as screws, clips, or cable ties), so that it fits tightly against the predetermined position of the wiring groove 23. This not only improves the positioning accuracy of the thermal wire 30, but also ensures its stability during long-term operation.

[0051] In this embodiment, the combination of multiple sets of fixing holes 25 and fasteners can limit the displacement of the thermal wire 30, ensuring its stable arrangement even when subjected to vibration, mechanical shock, or other external interference, thus preventing positional shifts from affecting the accuracy of temperature monitoring. To adapt to the actual application requirements of different battery packs, the number and spacing of the fixing holes 25 can be adjusted according to the specific length of the wiring groove 23 and the arrangement requirements of the thermal wire 30.

[0052] In other embodiments, please refer to Figure 4 , Figure 4 This is a schematic diagram of another bracket 20 and thermal wire 30 provided in this embodiment of the present invention. In order to simplify the installation process and provide a more reliable support structure, the bracket 20 also includes multiple sets of fixing blocks 26. These fixing blocks 26 are fixedly connected to the support part 21 and are used to clamp and fix the thermal wire 30 so that it can be stably arranged in a predetermined position and avoid displacement or loosening caused by external interference.

[0053] Specifically, each set of fixing blocks 26 includes a first fixing block 261 and a second fixing block 262, which are located on both sides of the thermal wire 30, forming a symmetrical layout. The fixing blocks 26 can clamp the thermal wire 30, thereby firmly fixing it in the wiring groove 23. The fixing blocks 26 are usually made of materials with a certain degree of elasticity or friction, such as rubber, silicone, or flexible polymer materials, to ensure that sufficient clamping force is provided without squeezing or damaging the thermal wire 30.

[0054] In this embodiment, the first fixing block 261 and the second fixing block 262 work together through a double-sided clamping method to effectively limit the lateral or longitudinal movement of the thermal wire 30, ensuring that it always remains in the predetermined position, thereby improving the arrangement stability of the thermal wire 30 and the reliability of temperature monitoring. During the wiring process, it can be inserted into the clamping area of ​​the fixing block 26 with just a light press, without the need for additional tools, which greatly simplifies the installation process and improves operational efficiency.

[0055] In some embodiments, please refer to Figures 5 to 7 , Figure 5 This is provided by the embodiment of the present utility model. Figure 1 Cross-sectional view along the AA direction. Figure 6 This is provided by the embodiment of the present utility model. Figure 5 A magnified view of a portion of region A in the middle. Figure 7 This is provided by the embodiment of the present utility model. Figure 5A partial enlarged view of region B. The battery cell 10 includes a terminal post 12. The terminal post 12 is located on the side of the battery cell 10 closest to the bracket 20. For ease of assembly between components, the bracket 20 has a positioning hole 27 on the side closest to the battery cell 10. The shape and size of the positioning hole 27 match the terminal post 12, allowing the terminal post 12 to be inserted into the positioning hole 27, thereby achieving the installation and positioning between the battery cell 10 and the bracket 20.

[0056] In this embodiment, the precise alignment between the battery cell 10 and the bracket 20 is achieved through the cooperation of the terminal post 12 and the positioning hole 27, avoiding positional deviations during assembly and ensuring that the battery cell 10 is neatly arranged on the bracket 20, providing a good foundation for subsequent battery pack assembly. Furthermore, the positioning hole 27 not only serves an alignment function but also provides additional mechanical support through its engagement with the terminal post 12, further enhancing the fixation effect between the battery cell 10 and the bracket 20 and reducing shaking or displacement of the battery cell 10 during use.

[0057] Furthermore, to further enhance the connection stability and anti-displacement capability between the battery cell 10 and the bracket 20, in some embodiments, the outer periphery of the electrode post 12 is provided with an annular groove, while the inner wall of the positioning hole 27 on the bracket 20 is provided with a protrusion structure that matches the annular groove. The annular groove of the electrode post 12 and the protrusion structure on the inner wall of the positioning hole 27 can achieve mechanical interlocking, thereby preventing displacement or loosening between the battery cell 10 and the bracket 20 due to external forces or long-term use.

[0058] In this embodiment, the annular groove on the outer periphery of the electrode post 12 can be evenly distributed along the circumference of the electrode post 12 or set in a specific area. Its shape is typically an annular groove or a recessed groove. The width and depth of the groove are designed according to the size of the electrode post 12 and the size of the positioning hole 27 in the bracket 20 to ensure a good fit with the protruding structure within the positioning hole 27. The protruding structure on the inner wall of the positioning hole 27 on the bracket 20 can be a small protrusion, a raised point, or an annular protrusion, which fits into the outer edge of the annular groove. When the electrode post 12 is inserted into the positioning hole 27, the annular groove and the protruding structure form a firm mechanical lock, preventing relative displacement of the electrode post 12 during use and improving the overall fixing effect between the battery cell 10 and the bracket 20.

[0059] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0060] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0061] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0062] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A battery pack, characterized in that, include: Multiple battery cells are arranged sequentially along their thickness direction; The bracket includes a support portion and multiple connecting portions. The multiple connecting portions are embedded in the support portion. Each connecting portion has a connecting surface that connects to the battery cell and a mounting surface located on the opposite side of the connecting surface. The connecting portions are arranged in multiple rows perpendicular to the width direction of the battery cell. In each row, the connecting portions are spaced apart along the width direction of the battery cell. On the side of the support portion close to the mounting surface, a wiring groove is formed between two adjacent rows of connecting portions. A thermally sensitive wire is installed in the wiring groove and is fixedly connected to the support part, used to activate the fire extinguishing device in response to a fire.

2. The battery pack according to claim 1, characterized in that, The battery cell also includes an explosion-proof valve, which is located on the side of the battery cell near the bracket. The support portion has clearance holes distributed in the wiring groove. The explosion-proof valve and the clearance holes at least partially overlap in the height direction of the battery cell.

3. A battery pack according to claim 2, characterized in that, The projection of the thermal wire onto the support and the projection of the explosion-proof valve onto the support do not coincide.

4. A battery pack according to claim 2, characterized in that, The thermal wire includes a first thermal wire and a second thermal wire, both of which extend along the width direction of the battery cell, and are located on both sides of the explosion-proof valve.

5. A battery pack according to claim 2, characterized in that, The thermal wire includes a first thermal wire and a second thermal wire. The first thermal wire includes multiple first sub-wires, which are all arranged along the width direction of the battery cell and are alternately distributed on both sides of the explosion-proof valve near the connection part. The second thermal wire includes multiple second sub-wires, which are all arranged perpendicular to the width direction of the battery cell and connected to adjacent first sub-wires.

6. A battery pack according to claim 5, characterized in that, The first thermal wire and the second thermal wire are integrally formed, and multiple alternating first sub-wires and second sub-wires are formed by bending.

7. A battery pack according to any one of claims 1-6, characterized in that, The support portion has multiple sets of fixing holes, which are located in the wiring groove. Each set of fixing holes includes a first fixing hole and a second fixing hole. The first fixing hole and the second fixing hole are located on both sides of the thermal wire, so that fasteners can fix the thermal wire.

8. A battery pack according to any one of claims 1-6, characterized in that, The bracket also includes multiple sets of fixing blocks, which are fixedly connected to the support and located in the cable tray. Each set of fixing blocks includes a first fixing block and a second fixing block, which are located on both sides of the thermal wire to clamp and fix the thermal wire.

9. A battery pack according to any one of claims 1-6, characterized in that, The battery cell also includes a terminal post, which is disposed on the side of the battery cell near the bracket. The bracket has a positioning hole on the side near the battery cell, and the positioning hole matches the shape of the terminal post for insertion and fixation.

10. A battery pack according to claim 9, characterized in that, The outer periphery of the pole post is provided with an annular groove, and the inner wall of the positioning hole is provided with a protrusion structure that cooperates with the annular groove. The annular groove and the protrusion structure are mechanically interlocked.

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