Shingled battery pack and battery system

Abstract

The utility model discloses a kind of shingle battery pack and battery system comprising the shingle battery pack, including first battery module and second battery module, each battery module is constituted by sheet-shaped battery cell, upper cover and end plate, second battery module is stacked on first battery module, positive and negative terminal seat is set on end plate, connecting column higher than terminal seat is equipped at the both ends of end plate, connecting column is connected with upper layer module end plate;The structure is accurately positioned and closely adhered between modules by connecting column and positioning protrusion, improve compression resistance, vibration resistance performance;Connecting column can also protect terminal from stacking stress, avoid deformation or short circuit, significantly improve assembly accuracy, mechanical strength and electrical safety, suitable for high reliability application scenario.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to battery packs and battery systems with higher space utilization. Background Technology

[0002] With the rapid development of new energy vehicles, energy storage systems, and portable high-power electronic devices, the requirements for energy density, safety, and structural compactness of battery systems are increasing. Existing battery modules are typically composed of multiple stacked sheet cells, which are fixed and packaged using end plates, top covers, and other structures. To improve the overall capacity and output power of the battery pack, multi-module stacking or side-by-side arrangement is often used to construct battery packs.

[0003] However, existing multi-module stacking technologies still have many shortcomings. In particular, to meet the requirements of compact layout and assembly, methods such as locally thickening the end plates, using spacers to limit the distance, or setting protective rings around the terminals are often used to control the lateral clearance and alignment between adjacent end plates. However, under conditions such as assembly compression, transportation, and normal use, vibration can easily cause lateral impacts to be transmitted along the terminal block-busbar path, leading to stress concentration and wear at the terminal solder joints and busbars, which can then cause terminal desoldering or even busbar tearing. On the other hand, the parallelism, coplanarity, and terminal coaxiality of the facing end plates of the left and right modules are greatly affected by the tolerance chain, often requiring the use of extended or flexible busbars to compensate for misalignment, resulting in problems such as increased loop area, increased impedance, and worsened EMI boundaries. Within the limited lateral space, creepage distance, electrical clearance, and mechanical support must also be considered simultaneously, presenting many difficulties in structural design trade-offs. Utility Model Content

[0004] This utility model aims to at least partially solve one of the problems existing in the prior art. To this end, this utility model proposes a shingled battery pack, including a first battery module and a second battery module. Both the first and second battery modules include stacked sheet-like cells, a top cover, and an end plate. The second battery module is stacked on top of the first battery module. Positive and negative terminal blocks are provided on the end plate, protruding axially from the outer surface of the end plate. Connecting posts are provided at both ends radially on the upper part of the end plate of the first battery module, with the height of the connecting posts greater than the height of the positive and negative terminal blocks. The connecting posts are connected to the bottom of the end plate of the second battery module. A positioning protrusion is provided at the center of the upper part of the end plate of the first battery module, and a corresponding recess is provided at the bottom of the end plate of the second battery module.

[0005] The shingled battery pack using the above solution ensures a tight fit between modules by setting connecting posts, positioning protrusions and corresponding recesses on the end plate. This makes the heat conduction path between modules more stable and helps to dissipate heat evenly. At the same time, the connecting posts can also partially share the heat transfer and avoid local overheating.

[0006] Furthermore, it ensures precise positioning of the first and second battery modules during stacking, preventing assembly misalignment and providing stable mechanical support between modules, thus improving overall assembly accuracy and reliability. Simultaneously, the height of the connecting posts is greater than the positive and negative terminal blocks, effectively protecting the terminals during stacking and reducing the risk of terminal deformation or short circuits, significantly enhancing electrical safety. Moreover, while ensuring compact module stacking, this structure enhances the battery pack's resistance to pressure and vibration, making it suitable for applications requiring high mechanical strength and reliability.

[0007] Preferably, the end plate of the second battery module has several grooves longitudinally arranged corresponding to the positive and negative terminal sub-seat connection areas. The sum of the surface areas of the grooves is greater than or equal to 10% and less than or equal to 20% of the surface area of ​​the connection area. The longitudinal arrangement of grooves in the terminal sub-seat connection areas on the end plate lengthens the surface path between the positive and negative terminal sub-seats, effectively increasing the creepage distance on the insulating surface. This reduces the risk of arcing or creepage discharge, improving the insulation safety of the battery module under high-voltage conditions. When the sum of the surface areas of the grooves exceeds 20%, it can easily weaken the overall load-bearing capacity and vibration resistance of the end plate; if it is less than 10%, the heat dissipation and weight reduction effects are not significant.

[0008] Preferably, the positive and negative terminal blocks of the end plate of the first battery module are respectively arranged on the same longitudinal axis as the positive and negative terminal blocks of the second battery module, and a ceramic dielectric coating is formed on the outer surface of the end plate of the second battery module corresponding to the connection area of ​​the positive and negative terminal blocks. This solution simplifies the electrical connection path, reduces internal resistance, and improves conductivity by arranging the positive and negative terminal blocks of the two modules on the same longitudinal axis. At the same time, the ceramic dielectric coating on the surface of the terminal connection area of ​​the end plate of the second battery module not only effectively improves the local insulation strength and withstand voltage performance, but also has good heat resistance, corrosion resistance, and flame retardant properties, thus improving the safety and reliability of the terminal area.

[0009] Preferably, the thickness of the ceramic dielectric coating in the area where the end plate of the second battery module contacts the positive and negative terminal blocks is more than twice the average thickness of the ceramic dielectric coating on the end plate. This solution provides stronger insulation protection and withstand voltage in critical stress and high-voltage concentrated areas, effectively reducing the risk of breakdown and creepage, while enhancing local wear resistance and mechanical shock resistance. Thus, without significantly increasing the overall weight and cost, it greatly improves the electrical safety and reliability of the contact area.

[0010] Preferably, a pop-out mechanism is provided at the center of the upper part of the end plate of the first battery module, and the positioning protrusion is located on the top of the pop-out mechanism. After being squeezed, the positioning protrusion retracts at least partially into the pop-out mechanism. This solution can provide reliable pre-positioning during module alignment and can also play a buffering role during assembly or under force, avoiding damage to the end plate or battery cell due to hard interference, and improving the fault tolerance of assembly.

[0011] Preferably, the bottom of the pop-out mechanism is provided with a micro-motion structure, and an LED display device is provided on the end plate and connected to the micro-motion structure. The LED display device on the end plate is linked to the pop-out mechanism to provide status feedback for the positioning protrusion, which can include at least the states of being in place, under pressure, and locked. This enables visual positioning during assembly, thereby reducing misassembly and rework. In use, it can serve as a safety feedback signal (power should not be supplied if not in place), improving electrical and mechanical safety; during maintenance, the LEDs can quickly diagnose abnormalities (misalignment, loss of lock after impact, etc.), shortening troubleshooting time.

[0012] Preferably, the positive and negative terminal sub-bases are radially slidably disposed on the upper part of the end plate, and the radial edges of the positive and negative terminal sub-bases are provided with raised flanges. The positive and negative busbars of the second battery module are disposed between the flanges. This design allows the terminal base to slide radially, enabling adaptive alignment of the busbars during assembly, absorbing dimensional tolerances, and reducing the risk of busbar bending and loose connections. The raised flanges on the periphery of the terminal base form guiding and limiting grooves, positioning the positive and negative busbars within them. The flanges act as electrical guardrails, improving creepage and electrical clearance, and reducing the probability of accidental contact and short circuits.

[0013] This utility model also describes a battery system, including a shingled battery pack as described above and a cooling system, wherein the cooling system manages the heat of the shingled battery pack. This system provides better heat dissipation performance for the shingled battery pack module, thereby improving the operational stability of the shingled battery pack. Attached Figure Description

[0014] Figure 1 This is a perspective view of a shingled battery module disclosed in this utility model;

[0015] Figure 2 This is a side view of a shingled battery module disclosed in this utility model;

[0016] Figure 3 This is a schematic diagram of the structure of a first battery module disclosed in this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of a second battery module disclosed in this utility model;

[0018] Figure 5 This is a schematic diagram of the structure of an end plate disclosed in this utility model;

[0019] Among them, 1. First battery module, 2. Second battery module, 3. Sheet-shaped battery cell, 4. Top cover, 5. End plate, 51. Positive terminal socket, 52. Negative terminal socket, 53. Connecting post, 54. Groove, 55. Positioning protrusion. Detailed Implementation

[0020] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Example 1

[0022] like Figures 1 to 5 As shown, this embodiment describes a shingled battery pack, including a first battery module 1 and a second battery module 2, both of which are composed of stacked sheet-like cells 3, a top cover 4, and an end plate 5; the second battery module 2 is stacked on top of the first battery module 1. The end plate 5 is provided with a positive terminal holder 51 and a negative terminal holder 52, axially (…). Figure 1 The X-axis protrudes from the outer surface; the upper radial part of the end plate 5 of the first battery module 1 ( Figure 1 Connecting posts 53 are provided at both ends of the first battery module 1 (Y-axis). The connecting posts 53 are higher than the positive terminal sub-base 51 and the negative terminal sub-base 52 and are connected to the bottom of the end plate 5 of the second battery module 2. A positioning protrusion 55 is provided at the upper center of the end plate 5 of the first battery module 1, and a corresponding recess (not shown in the figure) is provided at the bottom of the end plate 5 of the second battery module 2. The positive terminal sub-base 51 and the negative terminal sub-base 52 are radially slidably disposed on the upper part of the end plate 5. The radial edges of the positive terminal sub-base 51 and the negative terminal sub-base 52 are provided with raised flanges, and the positive terminal sub-base 51 and the negative terminal busbar of the second battery module 2 are disposed between the flanges.

[0023] This structure utilizes positioning protrusions 55 and recesses to achieve rapid and precise alignment of the upper and lower modules, preventing assembly misalignment. Connecting posts 53 provide upward support, creating stable mechanical support and ensuring a tight fit between modules with a continuous and controllable heat transfer path. Connecting posts 53 also function as heat bridges to distribute heat. Furthermore, because the height of connecting posts 53 is higher than the terminal blocks, circumferential protection effectively prevents deformation or accidental short circuits of the positive and negative terminals during stacking and transportation vibrations, significantly improving electrical safety. The overall solution is simple in structure, easy to mold in one piece, offers high assembly tolerance and efficiency, and enhances the battery pack's resistance to pressure and vibration, making it suitable for power and energy storage applications with high strength and reliability requirements.

[0024] Example 2

[0025] like Figure 4As shown, the difference between this embodiment and Embodiment 1 is that several grooves 54 are longitudinally arranged on the end plate 5 of the second battery module 2 corresponding to the connection area of ​​the positive terminal sub-base 51 and the negative terminal sub-base 52. The sum of the surface areas of the grooves 54 is approximately 11% of the surface area of ​​the connection area. The longitudinal arrangement of grooves 54 in the terminal sub-base connection area on the end plate 5 makes the surface path between the positive terminal sub-base 51 and the negative terminal sub-base 52 longer, which is equivalent to increasing the creepage distance of the insulating surface, thereby reducing the risk of arcing or creepage discharge and improving the insulation safety of the battery module under high voltage conditions.

[0026] The positive terminal 51 and negative terminal 52 of the end plate 5 of the first battery module 1 are respectively arranged on the same longitudinal axis as the positive terminal 51 and negative terminal 52 of the second battery module 2. A ceramic dielectric coating is formed on the outer surface of the end plate 5 of the second battery module 2 corresponding to the connection area of ​​the positive terminal 51 and negative terminal 52. This scheme simplifies the electrical connection path, reduces internal resistance and improves conductivity by arranging the positive terminal 51 and negative terminal 52 of the two modules on the same longitudinal axis, and effectively improves the local insulation strength and withstand voltage performance.

[0027] Example 3

[0028] The difference between this embodiment and Embodiment 2 is that the thickness of the ceramic dielectric coating in the area where the end plate 5 of the second battery module 2 contacts the positive terminal sub-base 51 and the negative terminal sub-base 52 is more than twice the average thickness of the ceramic dielectric coating on the end plate 5. This solution can provide stronger insulation protection and withstand voltage in critical stress and high voltage concentration areas, effectively reducing the risk of breakdown and creepage, while enhancing local wear resistance and mechanical shock resistance.

[0029] Example 4

[0030] The difference between this embodiment and Embodiment 1 is that a pop-out mechanism (not shown in the attached diagram) is provided at the upper center of the end plate 5 of the first battery module 1. A positioning protrusion 55 is located on the top of the pop-out mechanism, and the positioning protrusion 55 retracts at least partially into the pop-out mechanism after being squeezed. Furthermore, a micro-motion structure is provided at the bottom of the pop-out mechanism, and an LED display device is provided on the end plate 5 and connected to the micro-motion structure. This solution provides reliable visual pre-positioning during module alignment and also acts as a buffer during assembly or stress application, preventing damage to the end plate 5 or battery cells due to hard interference and improving assembly fault tolerance.

[0031] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0032] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the initial concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A shingled battery pack, comprising a first battery module and a second battery module, wherein both the first battery module and the second battery module comprise stacked sheet-like cells, a top cover, and an end plate, characterized in that, The second battery module is stacked on top of the first battery module. Positive and negative terminal blocks are provided on the end plate, and the positive and negative terminal blocks axially protrude from the outer surface of the end plate. Connecting posts are provided at both ends of the upper part of the end plate of the first battery module in a radial direction. The height of the connecting posts is greater than the height of the positive and negative terminal blocks. The connecting posts are connected to the bottom of the end plate of the second battery module. A positioning protrusion is provided at the center of the upper part of the end plate of the first battery module, and a recess corresponding to the positioning protrusion is provided at the bottom of the end plate of the second battery module.

2. The shingled battery pack according to claim 1, characterized in that, The end plate of the second battery module has several grooves longitudinally arranged corresponding to the positive and negative terminal sub-connection areas. The sum of the surface areas of the grooves is greater than or equal to 10% and less than or equal to 20% of the surface area of ​​the connection area.

3. The shingled battery pack according to claim 1, characterized in that, The positive and negative terminal blocks of the end plate of the first battery module are respectively arranged on the same longitudinal axis as the positive and negative terminal blocks of the second battery module. A ceramic dielectric coating is provided on the outer surface of the end plate of the second battery module corresponding to the connection area of ​​the positive and negative terminal blocks.

4. The shingled battery pack according to claim 3, characterized in that, The thickness of the ceramic dielectric coating in the area where the end plate of the second battery module contacts the positive and negative terminal sockets is more than twice the average thickness of the ceramic dielectric coating on the end plate.

5. The shingled battery pack according to claim 1, characterized in that, A pop-out mechanism is provided at the center of the upper part of the end plate of the first battery module. The positioning protrusion is provided on the top of the pop-out mechanism. When the positioning protrusion is squeezed, it retracts at least partially into the pop-out mechanism.

6. The shingled battery pack according to claim 5, characterized in that, The bottom of the pop-out mechanism is provided with a micro-motion structure, and an LED display device is provided on the end plate and connected to the micro-motion structure.

7. The shingled battery pack according to claim 1, characterized in that, The positive and negative terminal sub-seats are radially slidably disposed on the upper part of the end plate, and the radial edges of the positive and negative terminal sub-seats are provided with protruding flanges, and the positive and negative busbars of the second battery module are disposed between the flanges.

8. A battery system, characterized in that, Includes a shingled battery pack and a cooling system as described above, wherein the cooling system manages the heat of the shingled battery pack.

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