Hybrid lithium battery pack structure for truck start and battery module

Abstract

The present disclosure provides a hybrid lithium battery pack structure for truck starting, comprising an electric cell module and a battery management module. The electric cell module has a first lithium battery assembly and a second lithium battery assembly, which are connected in series. The battery management module includes a pressure sampling module and a charge and discharge control module, the pressure sampling module is connected in parallel with the first and second lithium battery assemblies, and the charge and discharge control module is connected to the pressure sampling module. The hybrid lithium battery pack adopts 7 groups of lithium iron phosphate cells and 1 group of ternary lithium cells, and the voltage characteristics of the two different chemical systems of the cells make the lithium battery pack working voltage range more accurately match the truck starter working voltage range. Thus, the hybrid lithium battery pack structure improves the voltage adaptability, effectively avoids the problem of insufficient working voltage of the truck starter caused by voltage mismatch, and further ensures the reliable operation of the truck starting system.

Description

Technical Field

[0001] This disclosure relates to the technical field of truck battery starting, and in particular to a hybrid lithium battery pack structure and battery module for truck starting. Background Technology

[0002] In truck power systems, the battery starting system is the core unit that ensures the normal starting of the vehicle. Lead-acid battery packs have been widely used in the truck starting field due to their mature technology and low cost. However, lead-acid batteries also have drawbacks such as low energy density, short cycle life, and easy heavy metal pollution after disposal.

[0003] Therefore, the industry is gradually adopting lithium-ion battery packs to replace lead-acid battery packs as the power source for truck starting systems. However, existing lithium-ion cell solutions are mainly divided into two categories: lithium iron phosphate cells and ternary lithium cells. Among them, a battery pack composed of 8 lithium iron phosphate cells has an operating voltage range of 24-28.4V, while the rated operating voltage range of most truck starters on the market is 28-28.8V. The upper voltage limit of this solution is lower than the minimum voltage required by the starter, and direct use can easily lead to insufficient starting voltage and starting failure. On the other hand, a battery pack composed of 7 ternary lithium cells has an operating voltage range of 21-29.4V. Although the upper voltage limit can cover the starter's requirements, the lower voltage limit is too low. During discharge, the voltage is prone to drop rapidly below the effective operating voltage of the starter, resulting in poor stability of the starting system. Utility Model Content

[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a hybrid lithium battery pack structure and battery module for truck starting by mixing two sets of lithium battery cells with different voltage platforms to improve the stability of the truck starting system.

[0005] The purpose of this disclosure is achieved through the following technical solution:

[0006] A hybrid lithium battery pack structure for truck starting includes a cell module and a battery management module. The cell module includes a first lithium battery assembly and a second lithium battery assembly. The second lithium battery assembly includes a plurality of second cells connected in series. The first lithium battery assembly has at least one first cell. The first lithium battery assembly and the second lithium battery assembly are connected in series so that the series voltage range of the first lithium battery assembly and the second lithium battery assembly is adapted to the operating voltage range of the truck starter.

[0007] The battery management module includes a voltage sampling module and a charge / discharge control module. The voltage sampling module is connected in parallel with the first lithium battery module and the second lithium battery module, respectively. The charge / discharge control module is connected to the voltage sampling module. The first battery cell is a ternary lithium battery cell, and the second battery cell is a lithium iron phosphate battery cell.

[0008] In one embodiment, the battery management module further includes a temperature sampling module connected to the pressure sampling module.

[0009] In one embodiment, the temperature sampling module includes multiple negative temperature coefficient detection units, each of which is connected to the pressure sampling module.

[0010] In one embodiment, the charge / discharge control module includes a current sampling module, a discharge control module, and a charge control module. The discharge control module is connected to the charge control module, and the current sampling module is connected to the battery cell module, the discharge control module, and the charge control module, respectively.

[0011] In one embodiment, the discharge control module has an N-channel depletion-type MOS transistor, which is used to control the electrical connection between the battery cell module and an external circuit.

[0012] In one embodiment, the capacity of the first battery cell is equal to the capacity of the second battery cell.

[0013] In one embodiment, the voltage range of the second battery cell is 3.2V to 3.55V.

[0014] In one embodiment, the voltage range of the first battery cell is 3.6V to 4.2V.

[0015] In one embodiment, the second lithium battery assembly includes seven second cells connected in series, and the first lithium battery assembly includes one first cell, such that the first cell and the seven second cells connected in series are sequentially connected in series to form a cell module.

[0016] This application also provides a battery module, including the hybrid lithium battery pack structure for truck starting described in any embodiment.

[0017] Compared with the prior art, this disclosure has at least the following advantages:

[0018] Compared to traditional single-cell lithium-ion battery solutions, the hybrid lithium battery pack structure 10 for truck starting utilizes a combination of seven lithium iron phosphate cells and one ternary lithium battery cell. By leveraging the voltage characteristics of these two different chemical systems, the operating voltage range of the lithium battery pack (26V-29.05V) is more precisely matched to the operating voltage range of the truck starter (28-28.8V). This improves the voltage adaptability of the hybrid lithium battery pack structure 10 for truck starting, effectively avoiding insufficient operating voltage due to voltage mismatch, and thus ensuring the stability of the truck starting system. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a hybrid lithium battery pack structure for truck starting, according to one embodiment.

[0021] Figure 2 for Figure 1 The diagram shows a working schematic of a hybrid lithium-ion battery pack structure used for truck starting. Detailed Implementation

[0022] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0026] like Figure 1 and Figure 2 As shown, a hybrid lithium battery pack structure 10 for truck starting according to an embodiment of the present disclosure includes a cell module 100 and a battery management module 200. The cell module 100 includes a first lithium battery assembly and a second lithium battery assembly. The second lithium battery assembly includes a plurality of second cells connected in series with each other. The first lithium battery assembly has at least one first cell. The first lithium battery assembly and the second lithium battery assembly are connected in series so that the series voltage range of the first lithium battery assembly and the second lithium battery assembly is adapted to the operating voltage range of the truck starter.

[0027] The battery management module 200 includes a voltage sampling module 210 and a charge / discharge control module 220. The voltage sampling module 210 is connected in parallel with the first lithium battery module and the second lithium battery module, respectively. The charge / discharge control module 220 is connected to the voltage sampling module 210. The first battery cell is a ternary lithium battery cell, and the second battery cell is a lithium iron phosphate battery cell.

[0028] In this embodiment, the first battery cell is a ternary lithium battery cell, and the second battery cell is a lithium iron phosphate battery cell. When the truck starts, the starter begins to work, requiring the battery pack to provide a stable current and a suitable voltage. At this time, the voltage sampling module 210 in the battery management module 200 begins to monitor the voltage of the first and second lithium battery modules in real time. Specifically, the second lithium battery module provides a base voltage by connecting seven lithium iron phosphate cells in series, with a low operating voltage of 7 × 3.2V = 22.4V and a high operating voltage of 7 × 3.55V = 24.85V. The first lithium battery module (one ternary lithium battery cell) is connected in series with the second lithium battery module to further increase the voltage. After the two are connected in series, the low operating voltage of the entire battery pack is 7 × 3.2V + 3.6V = 26V, and the high operating voltage is 7 × 3.55V + 4.2V = 29.05V. This voltage range exactly meets the 28-28.8V operating voltage requirement of the truck starter, providing sufficient and stable power to ensure the truck starts smoothly.

[0029] Furthermore, the charge / discharge control module 220 adjusts the current output in real time based on the voltage information fed back by the voltage sampling module 210, ensuring a sufficiently large starting current is provided at startup so that the starter can quickly drive the engine. Simultaneously, the charge / discharge control module 220 continuously monitors voltage changes to prevent damage to the battery pack and starter due to excessive voltage fluctuations during startup. The voltage sampling module 210 continuously monitors the voltage of each cell component to ensure that the voltage fluctuates within a safe range. In addition, during truck operation, if the electrical system load changes, such as when high-power equipment is activated, the battery pack requires a larger current. In this case, the charge / discharge control module 220 responds quickly, coordinating the current output of each cell component to ensure a stable power supply to the entire battery pack and maintain the normal operation of the truck's electrical system.

[0030] Furthermore, when the truck engine is running, the generator charges the battery pack. The voltage sampling module 210 monitors the charging voltage of the battery pack in real time and feeds this information back to the charge / discharge control module 220. Based on the information from the voltage sampling module 210, the charge / discharge control module 220 precisely controls the charging voltage according to the charging characteristics of cells with different chemical systems. For lithium iron phosphate cells and ternary lithium cells, because their charging cutoff voltages are different, the control module sets different protection voltages for each, ensuring that each cell charges within a suitable voltage range during the charging process and avoiding overcharging.

[0031] During charging, if the charging current is too high or the voltage is too high, the charge / discharge control module 220 will automatically adjust the charging parameters to reduce the charging current or voltage, protecting the battery pack from damage. Simultaneously, once the battery pack is fully charged, the charge / discharge control module 220 will promptly disconnect the charging circuit to prevent overcharging from damaging the battery cells, ensuring the safety and stability of the battery pack.

[0032] Compared to traditional single-cell lithium-ion battery solutions, the hybrid lithium battery pack structure 10 for truck starting utilizes a combination of seven lithium iron phosphate cells and one ternary lithium battery cell. By leveraging the voltage characteristics of these two different chemical systems, the operating voltage range of the lithium battery pack (26V-29.05V) is more precisely matched to the operating voltage range of the truck starter (28-28.8V). This improves the voltage adaptability of the hybrid lithium battery pack structure 10 for truck starting, effectively avoiding insufficient operating voltage due to voltage mismatch, and thus ensuring the stability of the truck starting system.

[0033] like Figure 1As shown, in one embodiment, the battery management module 200 further includes a temperature sampling module 230, which is connected to the pressure sampling module 210. In this embodiment, due to the complex and variable operating environment of trucks, the performance of the battery cells can be significantly affected under extreme high or low temperature conditions. At high temperatures, the chemical reaction rate inside the battery cell accelerates, potentially leading to increased internal resistance, faster capacity decay, and even safety issues such as thermal runaway. At low temperatures, the activity of the active materials in the battery cell decreases, increasing internal resistance and significantly reducing the battery's charging and discharging efficiency, making it unable to provide sufficient power to the truck starter. The addition of the temperature sampling module 230 allows for timely detection of abnormal changes in battery cell temperature. When the temperature sampling module 230 detects that the battery cell temperature is too high, it quickly feeds back the temperature information to the pressure sampling module 210, which then transmits this information to the charge / discharge control module 220. Upon receiving the high-temperature signal, the charge / discharge control module 220 immediately takes a series of measures to protect the battery pack.

[0034] like Figure 1 As shown, in one embodiment, the temperature sampling module 230 includes multiple negative temperature coefficient detection units, each of which is connected to the voltage sampling module 210. In this embodiment, when the temperature of a certain cell or local area rises abnormally, the resistance value of the corresponding negative temperature coefficient detection unit will drop rapidly. This change is converted into an electrical signal and transmitted to the voltage sampling module 210. After receiving these electrical signals containing temperature information, the voltage sampling module 210 can quickly and accurately determine the location and degree of the temperature anomaly and promptly transmit the information to the charge / discharge control module 220. Based on this precise temperature information, the charge / discharge control module 220 immediately takes targeted protective measures. For example, for areas with excessively high temperatures, the charge / discharge control module 220 will reduce the charging / discharging current of the relevant cells in that area to reduce heat generation; if the temperature continues to rise and exceeds the safety threshold, the charge / discharge control module 220 will decisively cut off the charging / discharging circuit of the cells in that area to prevent thermal runaway, thereby effectively protecting the safety of the entire battery pack.

[0035] like Figure 1As shown, in one embodiment, the charge / discharge control module 220 includes a current sampling module, a discharge control module, and a charge control module. The discharge control module is connected to the charge control module, and the current sampling module is connected to the cell module 100, the discharge control module, and the charge control module, respectively. In this embodiment, the current sampling module collects the current data of the cell module 100 in real time and accurately during the charge / discharge process. At the moment of truck start-up, the starter requires a large current to drive the engine. At this time, the current sampling module can quickly sense the rapid change in current and transmit this information to the discharge control module in a timely manner. Based on the received current information, the discharge control module precisely adjusts the output current to ensure that a sufficient and stable starting current is provided to the starter, avoiding start-up failure due to insufficient current, and preventing damage to the starter and battery pack due to excessive current. During the charging process, the current sampling module also monitors the charging current in real time. When abnormal fluctuations occur in the charging current, such as being too large or too small, it can promptly feed back the signal to the charge control module. Based on feedback information, the charging control module precisely adjusts the charging current to ensure that the charging process proceeds stably in accordance with the charging characteristics of lithium iron phosphate cells and ternary lithium cells, thus avoiding the impact of abnormal charging current on cell performance and lifespan.

[0036] like Figure 1 As shown, in one embodiment, the discharge control module has an N-channel depletion-mode MOSFET, which is used to control the electrical connection between the battery cell module 100 and the external circuit. In this embodiment, the N-channel depletion-mode MOSFET acts as a voltage control device, featuring low on-resistance and high switching speed. In the discharge control module, it is used as an electronic switch to precisely control the connection and disconnection of the battery cell module 100 with the external circuit. When the truck starter requires a large current for starting, the N-channel depletion-mode MOSFET can respond quickly, ensuring that the current is transmitted smoothly and efficiently to the starter, avoiding starting failure or equipment damage due to current fluctuations. Simultaneously, during truck operation, when the electrical system load changes, the N-channel depletion-mode MOSFET can dynamically adjust the current output according to the instructions of the charge / discharge control module 220, ensuring a stable power supply to the battery pack and maintaining the normal operation of the truck's electrical system.

[0037] like Figure 1As shown, in one embodiment, the capacity of the first cell is equal to that of the second cell. In this embodiment, since the capacity of the first cell is equal to that of the second cell, and the components they belong to are connected in series (the current is equal everywhere in a series circuit), the current flowing through each cell during charging is completely consistent, which avoids the situation where some cells are overcharged while others are not fully charged due to capacity differences. If the cell capacity difference is large, the smaller capacity cell will reach the charging cutoff voltage first, while the larger capacity cell is not fully charged. Continuing to charge at this time will cause the smaller capacity cell to be overcharged, damaging its performance and lifespan. Cells of the same capacity level can effectively avoid this problem, ensuring that each cell can be fully charged within a suitable voltage range, improving the charging efficiency and charging quality of the entire battery pack. During discharge, each cell can also release power synchronously, preventing a cell from discharging prematurely due to its smaller capacity, which would cause the voltage of the entire battery pack to drop too quickly, thus providing more stable support for the truck starter and electrical system.

[0038] like Figure 1 and Figure 2 As shown, in one embodiment, the voltage range of the second cell is 3.2V to 3.55V. In this embodiment, the truck starter operates at a voltage range of 28-28.8V, and the second cell is a lithium iron phosphate cell with a voltage range set at 3.2V to 3.55V. When the second lithium battery assembly has seven second cells connected in series, its low operating voltage is 7 × 3.2V = 22.4V, and its high operating voltage is 7 × 3.55V = 24.85V. After being connected in series with the first lithium battery assembly (one ternary lithium cell, voltage range 3.6V-4.2V), the entire battery pack has a low operating voltage of 7 × 3.2V + 3.6V = 26V and a high operating voltage of 7 × 3.55V + 4.2V = 29.05V. This voltage range can more accurately cover the operating voltage requirements of truck starters. Compared with other voltage range cell combinations, it can better ensure that the starter is provided with a stable and appropriate voltage under various operating conditions, effectively avoiding damage to the starter caused by excessively high or low voltage, thereby improving the starter's working stability and service life.

[0039] like Figure 1 and Figure 2As shown, in one embodiment, the voltage range of the first battery cell is 3.6V to 4.2V. In this embodiment, the first battery cell is a ternary lithium battery cell. When used in conjunction with the second lithium battery assembly (composed of seven second battery cells connected in series with a voltage range of 3.2V to 3.55V), the operating voltage range of the entire battery pack can precisely match the operating voltage requirements of the truck starter. As mentioned above, the second lithium battery assembly has a low operating voltage of 22.4V and a high operating voltage of 24.85V. After being connected in series with the first lithium battery assembly (one ternary lithium battery cell), the low operating voltage of the entire battery pack is 26V and the high operating voltage is 29.05V, while the operating voltage range of the truck starter is 28-28.8V. This voltage range of the first battery cell allows the battery pack's operating voltage range to closely cover the starter's operating voltage range, providing stable and sufficient power to the starter at the moment of truck start-up, ensuring that the starter can quickly and reliably drive the engine, thereby improving the success rate of truck starting. This avoids starting difficulties or failures due to insufficient voltage, and also prevents damage to the starter caused by excessive voltage.

[0040] like Figure 1 and Figure 2 As shown, in one embodiment, the second lithium battery assembly includes seven second cells connected in series, and the first lithium battery assembly includes one first cell, such that the first cell and the seven second cells connected in series are sequentially connected in series to form a cell module 100. In this embodiment, during the truck starting phase, this combination structure can accurately meet the starter's operating voltage requirements. Since the second cells are lithium iron phosphate cells, their voltage range is stable between 3.2V and 3.55V. After the seven second cells are connected in series, the low operating voltage of the second lithium battery assembly is 7 × 3.2V = 22.4V, and the high operating voltage is 7 × 3.55V = 24.85V. The first cell is a ternary lithium cell, with a voltage range of 3.6V to 4.2V. When it is connected in series with the second lithium battery assembly, the low operating voltage of the entire battery pack is 7 × 3.2V + 3.6V = 26V, and the high operating voltage is 7 × 3.55V + 4.2V = 29.05V. The truck starter operates at a voltage range of 28-28.8V, and this battery pack's operating voltage range closely covers the starter's operating voltage range, providing a stable and sufficient power supply. At the moment of starting, the starter requires a large current to turn the engine. This precise voltage matching ensures that the starter can work quickly and reliably, effectively avoiding starting difficulties or failures due to insufficient voltage, while also preventing damage to the starter from excessive voltage.

[0041] This application also provides a battery module, including a hybrid lithium battery pack structure 10 for truck starting according to any embodiment. In this embodiment, the first cell is a ternary lithium battery cell, and the second cell is a lithium iron phosphate battery cell. When the truck starts, the starter begins to work, requiring the battery pack to provide a stable current and a suitable voltage. At this time, the voltage sampling module 210 in the battery management module 200 begins to monitor the voltage of the first and second lithium battery packs in real time. Specifically, the second lithium battery module provides the base voltage through seven lithium iron phosphate cells connected in series. Its low operating voltage is 7 × 3.2V = 22.4V, and its high operating voltage is 7 × 3.55V = 24.85V. The first lithium battery module (one ternary lithium cell) is connected in series with the second lithium battery module to further increase the voltage. After the two are connected in series, the low operating voltage of the entire battery pack is 7 × 3.2V + 3.6V = 26V, and the high operating voltage is 7 × 3.55V + 4.2V = 29.05V. This voltage range meets the 28-28.8V operating voltage requirement of the truck starter, providing sufficient and stable power to ensure smooth truck starting. Furthermore, the charge and discharge control module 220 adjusts the current output in real time based on the voltage information fed back by the voltage sampling module 210 to ensure that a sufficiently large starting current is provided at the moment of starting, enabling the starter to quickly start the engine. Meanwhile, the charge / discharge control module 220 continuously monitors voltage changes to prevent damage to the battery pack and starter due to excessive voltage fluctuations during startup. The voltage sampling module 210 continuously monitors the voltage of each cell component to ensure that the voltage fluctuates within a safe range. Furthermore, during truck operation, if the electrical system load changes, such as when high-power equipment is activated, the battery pack requires a larger current. In this case, the charge / discharge control module 220 responds quickly, coordinating the current output of each cell component to ensure a stable power supply for the entire battery pack and maintain the normal operation of the truck's electrical system. Further, when the truck engine is running, the generator charges the battery pack. The voltage sampling module 210 monitors the charging voltage of the battery pack in real time and feeds this information back to the charge / discharge control module 220. Based on the information from the voltage sampling module 210, the charge / discharge control module 220 precisely controls the charging voltage according to the charging characteristics of cells with different chemical systems. For lithium iron phosphate cells and ternary lithium cells, due to their different charging cut-off voltages, the control module sets different protection voltages to ensure that each cell charges within a suitable voltage range during charging, avoiding overcharging. During charging, if the charging current is too high or the voltage is too high, the charge / discharge control module 220 will automatically adjust the charging parameters to reduce the charging current or voltage, protecting the battery pack from damage. Simultaneously, once the battery pack is fully charged, the charge / discharge control module 220 will promptly disconnect the charging circuit to prevent overcharging from damaging the battery cells, ensuring the safety and stability of the battery pack.

[0042] Compared with the prior art, this disclosure has at least the following advantages:

[0043] Compared to traditional single-cell lithium-ion battery solutions, the hybrid lithium battery pack structure 10 for truck starting utilizes a combination of seven lithium iron phosphate cells and one ternary lithium battery cell. By leveraging the voltage characteristics of these two different chemical systems, the operating voltage range of the lithium battery pack (26V-29.05V) is more precisely matched to the operating voltage range of the truck starter (28-28.8V). This improves the voltage adaptability of the hybrid lithium battery pack structure 10 for truck starting, effectively avoiding insufficient operating voltage due to voltage mismatch, and thus ensuring the stability of the truck starting system.

[0044] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A hybrid lithium battery pack structure for truck starting, characterized in that, The battery module includes a cell module and a battery management module. The cell module includes a first lithium battery assembly and a second lithium battery assembly. The second lithium battery assembly includes a plurality of second cells connected in series. The first lithium battery assembly has at least one first cell. The first lithium battery assembly and the second lithium battery assembly are connected in series so that the series voltage range of the first lithium battery assembly and the second lithium battery assembly is adapted to the operating voltage range of the truck starter. The battery management module includes a voltage sampling module and a charge / discharge control module. The voltage sampling module is connected in parallel with the first lithium battery module and the second lithium battery module, respectively. The charge / discharge control module is connected to the voltage sampling module. The first battery cell is a ternary lithium battery cell, and the second battery cell is a lithium iron phosphate battery cell.

2. The hybrid lithium battery pack structure for truck starting according to claim 1, characterized in that, The battery management module also includes a temperature sampling module, which is connected to the pressure sampling module.

3. The hybrid lithium battery pack structure for truck starting according to claim 2, characterized in that, The temperature sampling module includes multiple negative temperature coefficient detection units, each of which is connected to the pressure sampling module.

4. The hybrid lithium battery pack structure for truck starting according to claim 1, characterized in that, The charge / discharge control module includes a current sampling module, a discharge control module, and a charge control module. The discharge control module is connected to the charge control module, and the current sampling module is connected to the battery cell module, the discharge control module, and the charge control module, respectively.

5. The hybrid lithium battery pack structure for truck starting according to claim 4, characterized in that, The discharge control module has an N-channel depletion-type MOSFET, which is used to control the electrical connection between the battery cell module and the external circuit.

6. The hybrid lithium battery pack structure for truck starting according to claim 1, characterized in that, The capacity of the first battery cell is equal to the capacity of the second battery cell.

7. The hybrid lithium battery pack structure for truck starting according to claim 6, characterized in that, The voltage range of the second battery cell is 3.2V to 3.55V.

8. The hybrid lithium battery pack structure for truck starting according to claim 6, characterized in that, The voltage range of the first battery cell is 3.6V to 4.2V.

9. The hybrid lithium battery pack structure for truck starting according to claim 1, characterized in that, The second lithium battery assembly includes seven second cells connected in series, and the first lithium battery assembly includes one first cell, so that the first cell and the seven second cells connected in series are connected in series to form a cell module.

10. A battery module, characterized in that, Includes the hybrid lithium battery pack structure for truck starting as described in any one of claims 1 to 9.

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