Square lithium battery module with good heat dissipation
Patent Information
- Application Number
- CN202422643408.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-10-31
Smart Images
Figure CN223462361U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to square lithium battery module technical field, especially a square lithium battery module that good heat dissipation. BACKGROUND
[0002] Square lithium battery encapsulation is reliable, energy efficiency is high, relative weight is light, structure is relatively simple, and expansion is relatively convenient, and in specific use, can be combined together through series connection or parallel connection mode, and then further assembly fixed formation battery pack is formed after liquid cooling or air cooling mechanism is added, in the prior art, the contact area of square lithium battery vertical placement with air cooling plate is small, and the heat capacity and thermal conductivity of air are relatively low, resulting in that the temperature control efficiency of air cooling heat dissipation is relatively low, and the heat transfer rate is slow, which cannot satisfy the efficient heat dissipation demand of battery pack.
[0003] In addition, the pole connection mode of the metal connecting piece welding currently has many shortcomings, such as poor welding consistency, cannot guarantee the welding success rate, is not easy to detect, if there is poor welding, it is difficult to repair, and the welding process is complex and the production efficiency is low, and the place of unfirm welding can be cracked under the influence of external force such as use scene vibration, resulting in connection interruption. These shortcomings will affect the overall performance of the square lithium battery module.
[0004] Therefore, the present application is proposed. UTILITY MODEL CONTENT
[0005] In view of the above-mentioned shortcomings of the prior art, the utility model provides a square lithium battery module that good heat dissipation.
[0006] In order to achieve the above-mentioned purpose, the main technical scheme adopted by the utility model comprises:
[0007] A square lithium battery module that good heat dissipation, comprising: a battery string formed by a plurality of square lithium batteries connected in series, a battery string fixing frame and two air cooling plates.
[0008] The battery string comprises two rows of battery groups, each row of battery groups comprises a plurality of square lithium batteries with large faces downward and separated from each other by insulating spacers, the two rows of battery groups are placed in a staggered manner so that the pole columns of the two rows of battery groups are opposite and electrically opposite, and the two rows of battery groups are connected by a conductive connecting piece so that all the square lithium batteries are connected in series.
[0009] A fixing unit is provided on the battery string fixing frame corresponding to each square lithium battery, a limiting strip is provided in the battery string fixing frame, and limiting grooves are distributed on the limiting strip.
[0010] The conductive connecting piece comprises a connecting pipe, a probe, a limiting piece and a spring, the limiting piece is fixed on the connecting pipe, two probes are slidably arranged at two ends of the connecting pipe, and the spring is sleeved on the part of the connecting pipe between the probe and the limiting piece, and the connecting pipe is a hollow structure capable of conducting electricity;
[0011] The square lithium battery is placed in the fixing unit, the pole columns of the two rows of battery groups are electrically connected through the two probes of the conductive connecting piece, and the limiting piece is just clamped into the limiting slot, and the two air-cooled plates are respectively located on the upper surface and the lower surface of the battery string and are fixedly connected.
[0012] Preferably, the probe comprises a probe body and a probe mounting sleeve, the probe body is slidably connected with the connecting pipe through the probe mounting sleeve, and a plurality of uniformly distributed contact teeth are arranged on the end face of the free end of the probe body, and the contact teeth are concave relative to the end face.
[0013] Preferably, the connecting pipe is provided with a grouting hole for injecting conductive silver paste into the connecting pipe.
[0014] Preferably, the contact teeth are selected from any one or more of rectangular teeth, spherical teeth, conical teeth, wave-shaped teeth and saw-shaped teeth.
[0015] Preferably, the contact resistance of the contact teeth is less than 10 mΩ, and the elastic force of the spring is greater than 300 Kg.
[0016] Preferably, the probe body and the probe mounting sleeve are welded, riveted or integrally formed, and the probe body and the contact teeth are integrally formed.
[0017] Preferably, the limiting piece is selected from one of a limiting ring, a clamping spring, a limiting pin and a limiting bolt.
[0018] Preferably, the air-cooled plate is uniformly provided with an air-cooled flow channel, the air-cooled plate is provided with connecting holes at four corners, and the connecting holes corresponding to each other on the two air-cooled plates are connected through connecting bolts.
[0019] Preferably, the air-cooled plate is extruded from a 6063 aluminum plate, and the air-cooled flow channel is provided with a support beam.
[0020] Compared with the prior art, the utility model has at least the following beneficial effects:
[0021] 1. The square lithium battery is placed through the conductive connecting piece, and the contact area with the air-cooled plate is significantly increased, so that the heat dissipation performance of the battery module is effectively improved, and the improvement of the heat dissipation performance helps to improve the comprehensive performance of the lithium battery module.
[0022] 2. Conductive connectors are weld-free, thus avoiding the shortcomings of traditional welding, such as poor consistency, cold welding, cumbersome operation, and low production efficiency. They can also be disassembled and replaced at any time. On the one hand, this helps meet the requirements of battery module recycling. On the other hand, when the battery pack is retired and disassembled, manual disassembly is efficient and less likely to cause safety issues such as short circuits and leakage.
[0023] 3. The conductive connector is elastically connected to the pole, which can adapt to a certain vibration force. Even if there is external force such as vibration in the use scenario, the connection will not loosen or break, which is stable and reliable.
[0024] 4. The number of square aluminum shell battery cells is controllable and reliable, so the utility model has a wide range of applications, strong practicality and good performance. It can provide emergency supplementary power for new energy vehicles and also provide power for ordinary household appliances. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0026] Figure 1 It is a structural diagram of the utility model;
[0027] Figure 2 for Figure 1 Schematic diagram of the structure of the air cooling plate;
[0028] Figure 3 for Figure 1 Schematic diagram of the structure of the battery string;
[0029] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at M in the middle;
[0030] Figure 5 for Figure 1 Schematic diagram of the structure of the conductive connector;
[0031] Figure 6 for Figure 5 Schematic diagram of the probe structure.
[0032] In the figure: 1. Air-cooling plate; 11. Air-cooling flow channel; 12. Connection hole; 2. Battery string; 3. Battery string fixing frame; 31. Limiting bar; 311. Limiting groove; 4. Conductive connector; 41. Connecting pipe; 411. Grouting hole; 42. Probe; 421. Probe body; 4211. Contact tooth; 422. Probe mounting sleeve; 43. Limiting piece; 44. Spring; 5. Connecting bolt. DETAILED DESCRIPTION
[0033] The technical solutions in the embodiments of the present application will be described clearly and completely 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. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.
[0034] The structures not described in detail in the following embodiments are prior art, and the orientation words such as "left end", "right end" and the like used for clearly describing the relative position relationship of components do not limit the protection scope of the present application. The "sliding connection", "fixed connection" and the like used for clearly describing the connection relationship between components all adopt the prior art and the conventional technical means in the art, and are not the improvements of the present application.
[0035] As Figures 1-6 The application discloses a square lithium battery module with good heat dissipation, which comprises a battery string 2 formed by connecting eight square lithium batteries in series, a battery string fixing frame 3 and two air-cooled plates 1.
[0036] The battery string 2 comprises two rows of battery groups, each row of the battery groups comprises four square lithium batteries with large surfaces downward and separated from each other by insulating pads, the two rows of the battery groups are placed in a staggered manner so that the pole columns of the two rows of the battery groups are opposite and electrically opposite, and the two rows of the battery groups are connected by a conductive connecting piece 4 so that all the square lithium batteries are connected in series.
[0037] The battery string fixing frame 3 is provided with a fixing unit corresponding to each square lithium battery, the battery string fixing frame 3 is provided with a limiting strip 31, and the limiting strip 31 is provided with limiting grooves 311.
[0038] The conductive connecting piece 4 comprises a connecting pipe 41, a probe 42, a limiting piece 43 and a spring 44, the limiting piece 43 is fixed on the connecting pipe 41, the two probes 42 are slidably arranged at two ends of the connecting pipe 41, the spring 44 is sleeved on a portion of the connecting pipe 41 between the probe 42 and the limiting piece 43, and the connecting pipe 41 is a hollow structure that can conduct electricity.
[0039] The square lithium battery is placed in the fixing unit, the pole columns of the two rows of battery groups are electrically connected through the two probes 42 of the conductive connecting piece 4, and then the limiting piece 43 is clamped into the limiting groove 311, and the two air-cooled plates 1 are respectively fixedly connected to the upper surface and the lower surface of the battery string 2.
[0040] Specifically, Figure 1A, B, C, D, E, F, G, H in the figure respectively represent different square lithium batteries, A1, B1, C1, D1, E1, F1, G1, H1 respectively represent different fixed units of the battery string fixing frame 3. The square lithium batteries A, C, E and G are arranged in a column, and the square lithium batteries B, D, F and H are arranged in a column. Each battery is fixed and placed in the corresponding fixed unit of the battery string fixing frame 3. The negative pole of the battery A is arranged opposite to the positive pole of the battery B, the negative pole of the battery B is arranged opposite to the positive pole of the battery C, and the arrangement is repeated. The battery A and the battery B are connected by a conductive connecting piece 4. The two probes 42 of the conductive connecting piece 4 are in elastic contact with the negative pole of the battery A and the positive pole of the battery B under the action of the spring 44 to realize electrical connection. After installation, the limiting piece 43 of the conductive connecting piece 4 is just clamped into the limiting groove 311 on the limiting strip 31. Finally, the battery A, the battery B, the battery C, the battery D, the battery E, the battery F, the battery G and the battery H are connected in series. The positive pole of the battery A is led out to become a total positive pole, and the negative pole of the battery H is led out to become a total negative pole. Through the above structure design, under the action of the conductive connecting piece 4, the large faces of the eight square lithium batteries face downward, and the upper surfaces and the lower surfaces are in contact with the air-cooled plate 1, the contact area is significantly increased, which helps to improve the heat dissipation performance of the battery module, and then improves the comprehensive performance of the lithium battery module.
[0041] It should be noted that:
[0042] (1) The capacity of the square lithium battery can be flexibly selected, and 100Ah-300Ah can be selected.
[0043] (2) The specific number of square lithium batteries in the two rows of battery groups can also be flexibly selected, and it is appropriate that 4-8 in each row. The number of square lithium batteries in the two rows of battery groups is the same, and the difference is too much, which affects the structural stability of the square lithium battery module and is not conducive to the improvement of the energy density.
[0044] (3) The limiting strip 31 is fixedly arranged in the battery string fixing frame 3, and the limiting groove 311 is a prior art. Any prior art that can clamp the limiting piece 43 to prevent it from moving can be used, such as a few-shaped clamping groove.
[0045] (4) The insulating gasket can be a flame-retardant foam sheet. On the one hand, it can separate adjacent square lithium batteries from each other to avoid mutual interference. On the other hand, it can also leave expansion space for the square lithium batteries to increase their service life.
[0046] (5) In specific use, the square lithium battery module of the utility model can be assembled into a square lithium battery system by matching with necessary structures such as a shell, a cover plate, a air supply device, an inverter, a BMS protection plate and the like, and can provide power for household appliances, new energy vehicles and the like.
[0047] As a preferred technical scheme, the probe 42 comprises a probe body 421 and a probe mounting sleeve 422, the probe body 421 is slidably connected with the connecting pipe 41 through the probe mounting sleeve 422, and a plurality of uniformly distributed contact teeth 4211 are arranged on the end face of the free end of the probe body 421 and are recessed inward relative to the end face.
[0048] In the embodiment, the inward recessing degree of the contact teeth 4211 should not be too small or too large, for example, if the inward recessing degree is too large, the contact teeth 4211 cannot stably contact the pole or even cannot contact the pole, which is not conducive to the stability of the connection, and if the inward recessing degree is too small, the clamping effect of the probe body 421 on the pole is not obvious, and the connection can be disconnected in the use scene with vibration. Generally, the depth of the wrapping cavity formed by the recessing of the contact teeth 4211 is preferably 1 / 3-1 / 2 of the height of the pole, and within the range, stable connection can be realized, the elastic range of the conductive connecting piece 4 is not affected, and the use requirement in the scene with vibration is ensured.
[0049] As a preferred technical scheme, the connecting pipe 41 is provided with a grouting hole 411 for injecting conductive silver paste into the connecting pipe 41.
[0050] The silver paste is injected into the connecting pipe 41 through the grouting hole 411, which can enhance the conductivity of the connecting pipe 41, fill the hollow caused by the inconsistent compression amount of the spring 44, ensure the stability and reliability of the electrical connection, and further enhance the mechanical strength of the connection to prevent the connection from failing due to vibration or impact. After the grouting is completed, the grouting hole 411 is plugged by a plugging screw.
[0051] As a preferred technical scheme, the contact teeth 4211 are selected from any one or more of a rectangular tooth, a spherical tooth, a conical tooth, a wave-shaped tooth and a saw-shaped tooth. The contact teeth in the above structure can ensure stable contact between the probe 42 and the positive and negative poles to be connected to realize firm electrical connection. Of course, other structures in the prior art can also be used.
[0052] As a preferred technical scheme, the contact resistance of the contact teeth 4211 is less than 10 mΩ, and the spring force of the spring 44 is greater than 300 Kg, and the spring 44 is a stainless steel spring. The contact resistance of the contact teeth 4211 should not be too large, otherwise the electrical connection effect will be affected, and the spring force of the spring 44 should not be too small, otherwise the electrical connection effect will also be affected, and the firm contact between the probe 42 and the pole cannot be ensured in the use scene with vibration, so the stability of the connection cannot be ensured.
[0053] As a preferred technical scheme, in a further embodiment of the utility model, the probe body 421 and the probe mounting sleeve 422 are welded, riveted or integrally formed, and the probe body 421 and the contact tooth 4211 are integrally formed. The material of the above components can be copper, preferably gold-plated brass.
[0054] As a preferred technical scheme, in another embodiment of the utility model, the limiting piece 43 is selected from one of a limiting ring, a snap spring, a limiting pin and a limiting bolt.
[0055] As a preferred technical scheme, in a further embodiment of the utility model, the air-cooled plate 1 is uniformly provided with air-cooled flow channels 11, and the air-cooled plate 1 is provided with connecting holes 12 at four corners, and the connecting holes 12 corresponding to each other on the two air-cooled plates 1 are connected by connecting bolts 5 to realize fixed connection between the two air-cooled plates 1, and at the same time, the battery string 2 is reinforced.
[0056] As a preferred technical scheme, in a further embodiment of the utility model, the air-cooled plate 1 is extruded from a 6063 aluminum plate, and the air-cooled flow channels 11 are provided with supporting beams.
[0057] In summary: the utility model discloses a unique structure of the conductive connecting piece realizes that square lithium battery lies and forms module, and the large surface of square lithium battery contacts with the air-cooled plate, and compared with the existing vertical placement mode, the heat dissipation area is significantly increased, so the heat dissipation effect is better, and the conductive connecting piece is used for pole connection and is exempted from welding, so that the problems of consistency difficult to control, virtual welding, complex operation, low production efficiency, high integrated cost and the like caused by traditional welding are avoided, not only stable connection, but also adapt to the use scene with vibration, and the use can also meet the requirement of battery module gradient utilization, and the whole lithium battery module is convenient to disassemble and is not prone to safety problems.
[0058] Although the embodiments of the utility model have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the utility model, and the person skilled in the art can make changes, modifications, replacements and deformation to the above embodiments within the scope of the utility model. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of different embodiments or examples without mutual contradiction.
Claims
1. A square lithium battery module having good heat dissipation, characterized by, The application relates to a battery string (2) composed of a plurality of square lithium batteries connected in series, a battery string fixing frame (3) and two air-cooled plates (1). The battery string (2) comprises two rows of battery groups, each row of the battery groups comprises a plurality of square lithium batteries with large downward faces and separated from each other by insulating pads, the two rows of the battery groups are placed in a staggered mode so that the pole columns of the two rows of the battery groups are opposite and electrically opposite, and the two rows of the battery groups are connected by conductive connecting pieces (4) so that all the square lithium batteries are connected in series. The battery string fixing frame (3) is provided with a fixing unit corresponding to each square lithium battery, and a limiting strip (31) is arranged in the battery string fixing frame (3), and limiting grooves (311) are distributed on the limiting strip (31). The conductive connecting piece (4) comprises a connecting pipe (41), a probe (42), a limiting piece (43) and a spring (44), the limiting piece (43) is fixed on the connecting pipe (41), two probes (42) are slidably arranged at two ends of the connecting pipe (41), the spring (44) is sleeved on a portion of the connecting pipe (41) between the probes (42) and the limiting piece (43), and the connecting pipe (41) is a conductive hollow structure. The square lithium batteries are placed in the fixing units, the pole columns of the two rows of the battery groups are electrically connected through the two probes (42) of the conductive connecting piece (4), and then the limiting piece (43) is just clamped into the limiting groove (311), and the two air-cooled plates (1) are respectively arranged on the upper surface and the lower surface of the battery string (2) and are fixedly connected. The probe (42) comprises a probe body (421) and a probe mounting sleeve (422), the probe body (421) is slidably connected with the connecting pipe (41) through the probe mounting sleeve (422), a plurality of uniformly distributed contact teeth (4211) are arranged on the end face of the free end of the probe body (421), and the contact teeth (4211) are concave relative to the end face.
2. The square lithium battery module with good heat dissipation according to claim 1, characterized in that, A grouting hole (411) for injecting conductive silver paste into the connecting pipe (41) is arranged on the connecting pipe (41).
3. The square lithium battery module with good heat dissipation according to claim 2, characterized in that, The contact teeth (4211) are selected from any one or more of rectangular teeth, spherical teeth, conical teeth, wave-shaped teeth and saw-shaped teeth.
4. The square lithium battery module with good heat dissipation according to claim 2, characterized in that, The contact resistance of the contact teeth (4211) is less than 10 m omega, and the elastic force of the spring (44) is greater than 300 Kg.
5. The square lithium battery module with good heat dissipation according to claim 2, characterized in that, The probe body (421) and the probe mounting sleeve (422) are welded, riveted or integrally formed, and the probe body (421) and the contact teeth (4211) are integrally formed.
6. The square lithium battery module with good heat dissipation according to claim 2, characterized in that, The limiting piece (43) is selected from one of a limiting ring, a snap spring, a limiting pin and a limiting bolt.
7. The square lithium battery module with good heat dissipation according to claim 1, characterized in that, The air-cooled plate (1) is uniformly provided with air-cooled flow channels (11), and the air-cooled plate (1) is provided with connecting holes (12) at four corners, and the connecting holes (12) corresponding to each other on the two air-cooled plates (1) are connected through connecting bolts (5).
8. The square lithium battery module with good heat dissipation according to claim 1, characterized in that, The air-cooled plate (1) is extruded from a 6063 aluminum plate, and the air-cooled flow channels (11) are provided with supporting beams.
9. The square lithium battery module with good heat dissipation according to claim 8, characterized in that,