Battery cell, battery pack and vehicle

Abstract

The utility model discloses a battery cell, a battery pack and a vehicle, the battery cell comprises a positive plate, a negative plate, a diaphragm, a shell and an explosion-proof valve, and the positive plate and the negative plate are separated by the diaphragm and laminated in the shell; a first groove is formed in one end of the positive plate, and a second groove is formed in one end of the negative plate; the first groove and the second groove are oppositely arranged, and a space surrounded by the first groove and the second groove forms an accumulation exhaust channel; the anti-explosion valve is installed on the shell, and the orthographic projection of the accumulation exhaust channel on the anti-explosion valve on the installation face of the shell is located in the anti-explosion valve. When the battery cell is in thermal runaway, the accumulation exhaust channel is filled with hot gas generated in the battery cell, and the hot gas is directionally exhausted out of the shell through the anti-explosion valve, so that the gas exhaust efficiency is improved while the safety of the battery is realized.

Description

Technical Field

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

[0002] As a key component of pure electric vehicles, the performance of the power battery directly impacts the development prospects of these vehicles. Power lithium batteries consist of components such as electrodes, electrolyte, casing, cover, and explosion-proof valve. To improve battery safety and reliability, explosion-proof valves are typically added to the battery cover and a base plate is added to the bottom of the electrodes. In the event of thermal runaway under abnormal conditions, the explosion-proof valve releases pressure. However, with the explosion-proof valve located on the top cover, it sprays gas into the top space of the battery when activated. Because the internal electrode assembly and casing are tightly fitted, when the internal pressure is too high and rapid pressure release through the explosion-proof valve is required, the gas discharge is affected by the gaps between the electrode assembly and the casing, resulting in low gas discharge efficiency and posing a certain safety hazard. Utility Model Content

[0003] Based on this, this application provides a battery cell, a battery pack, and a vehicle to solve the problems existing in the prior art.

[0004] In a first aspect, a battery cell includes: a positive electrode, a negative electrode, a separator, a housing, and an explosion-proof valve, wherein the positive electrode and the negative electrode are separated by the separator and stacked in the housing; a first groove is formed on one end of the positive electrode, and a second groove is formed on one end of the negative electrode; the first groove and the second groove are arranged opposite to each other and the space enclosed by them forms a venting channel; the explosion-proof valve is mounted on the housing, and the venting channel is located inside the explosion-proof valve when projected onto the mounting surface of the explosion-proof valve on the housing.

[0005] Furthermore, the first groove is disposed on the edge of the positive electrode sheet and the opening direction of the first groove faces the outside of the positive electrode sheet, and the second groove is disposed on the edge of the negative electrode sheet and the opening direction of the second groove faces the outside of the negative electrode sheet.

[0006] Furthermore, the positive electrode and the negative electrode are separated by the diaphragm and stacked in the housing, with a reserved exhaust channel provided between them and the housing. The reserved exhaust channel is connected to the accumulated exhaust channel.

[0007] Furthermore, the first groove and the second groove partially or completely overlap along the width direction of the battery cell.

[0008] Furthermore, a positive electrode tab is connected to the positive electrode plate, and a negative electrode tab is connected to the negative electrode plate; the first groove and the positive electrode tab are located on opposite sides of the positive electrode plate, and the second groove and the negative electrode tab are located on opposite sides of the negative electrode plate.

[0009] Furthermore, the openings of both the first and second grooves face the bottom of the housing, and the explosion-proof valve is located at the bottom of the housing.

[0010] Furthermore, the areas of the positive electrode, negative electrode, and separator increase sequentially, and the separator covers the edge of the negative electrode.

[0011] Furthermore, the diaphragm extends into the accumulation exhaust channel and separates the accumulation exhaust channel.

[0012] Furthermore, there is at least one explosion-proof valve, and the spatial center of the at least one explosion-proof valve is located within the spatial envelope of the accumulating exhaust channel.

[0013] In a second aspect, a battery pack includes the battery cells described in the first aspect.

[0014] Thirdly, a vehicle comprising: a vehicle body; and a battery pack as described in the second aspect disposed within the vehicle body.

[0015] In this application, the positive and negative electrode plates are disposed in the housing, and the explosion-proof valve is installed on the housing and located in the gas accumulation channel. When the cell experiences thermal runaway, the hot gas generated in the cell fills the gas accumulation channel and is directed to be discharged from the housing through the explosion-proof valve, thereby achieving battery safety while improving gas discharge efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure between the positive electrode, the negative electrode, and the separator provided in one embodiment of this application;

[0017] Figure 2 For this application Figure 1 A schematic diagram of the structure including the shell;

[0018] Figure 3 This is an isometric view of a battery cell according to an embodiment of this application;

[0019] Figure 4 This is another isometric view of a battery cell according to an embodiment of this application;

[0020] Figure 5 This is a schematic diagram of the internal venting channel of a battery cell according to an embodiment of this application;

[0021] Figure 6 for Figure 1 A schematic diagram of the side structure;

[0022] Figure label:

[0023] Positive electrode 1, negative electrode 2, diaphragm 3, shell 4, explosion-proof valve 5, positive electrode tab 6, negative electrode tab 7, negative electrode post 8, positive electrode post 9, first groove 11, second groove 21, top exhaust channel 101, side exhaust channel 102, bottom exhaust channel 103, accumulation exhaust channel 104. Detailed Implementation

[0024] To make the technical solutions and advantages of the embodiments of this application clearer, the exemplary embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0025] One embodiment of this application is, for example... Figure 1 , 2 As shown in Figure 6, a battery cell includes a positive electrode 1, a negative electrode 2, a separator 3, a housing 4, and an explosion-proof valve 5. The positive electrode 1 and the negative electrode 2 are separated by the separator 3 and stacked in the housing 4. A first groove 11 is formed on one end of the positive electrode 1, and a second groove 21 is formed on one end of the negative electrode 2. The first groove 11 and the second groove 21 are arranged opposite to each other, and the space enclosed by them forms a accumulating exhaust channel 104. The explosion-proof valve 5 is installed on the housing 4, and the accumulating exhaust channel 104 is located inside the explosion-proof valve 5 when projected onto the mounting surface of the housing.

[0026] Explained, positive electrode 1 and negative electrode 2 are components of the battery. Positive electrode 1 consists of a current collector containing positive electrode active material. In lithium-ion batteries, the positive electrode active material can be lithium cobalt oxide (LiCoO2), lithium manganese oxide (LiMn2O4), lithium iron phosphate (LiFePO4), etc. The function of the positive electrode is to accept electrons during discharge and release electrons during charging. Negative electrode 2 contains negative electrode active material, such as graphite, silicon-based materials, or lithium titanate. During battery discharge, the negative electrode releases electrons, while during charging, it accepts electrons and stores lithium ions.

[0027] The explosion-proof valve 5 is a safety device that automatically opens when the pressure exceeds a set value, releasing the internal gas pressure of the battery cell and thus preventing the cell from exploding or being damaged internally. Preferably, it has an opening surface that opens to allow gas pressure release when the internal pressure reaches a certain level.

[0028] The housing mounting surface is a plane of the housing 4 on which the explosion-proof valve is installed.

[0029] The accumulating exhaust channel 104 is a channel for collecting, guiding, and discharging hot gases that may accumulate inside the battery cell. It is spatially connected to the explosion-proof valve 5 to ensure that the accumulated hot gases can be smoothly discharged through the channel when the explosion-proof valve is opened, thereby avoiding damage to the inside of the battery cell.

[0030] Orthographic projection refers to the shadow or outline of the explosion-proof valve 5 on the housing mounting surface when viewed from a direction perpendicular to the housing mounting surface. It can be understood as a two-dimensional representation of the explosion-proof valve on the housing mounting surface.

[0031] In the above embodiments, when the battery cell experiences thermal runaway, the hot gas generated in the battery cell fills the accumulation and exhaust channel, and the hot gas is directed to be discharged from the casing through the explosion-proof valve, thereby ensuring battery safety while improving gas discharge efficiency.

[0032] As one example, such as Figure 5 As shown, the positive electrode 1 and the negative electrode 2 are separated by a separator 3 and stacked in the housing 4, with a reserved exhaust channel between them. This means there is an airflow channel around the housing 4, and the gap at the edge is smaller than in the prior art. The main exhaust channel is the accumulating exhaust channel 104. The reserved exhaust channels include a top exhaust channel 101, a side exhaust channel 102, and a bottom exhaust channel 103, all connected to the accumulating exhaust channel 104. Explained, if the overall reserved gap between the electrode core and the housing is too large, it will cause a loss of battery capacity or energy density. Therefore, in this embodiment, grooves are cut into the electrode portions to form the accumulating exhaust channel 104, reducing the reserved exhaust channel size. This makes the space of the accumulating exhaust channel 104 correspond to the position of the explosion-proof valve, forming a spatial gap comparable to the size of the explosion-proof valve. This ensures both the safety and reliability of the battery while meeting the requirements for battery capacity and energy density.

[0033] A first groove 11 is formed on the positive electrode 1, and a second groove 21 is formed on the negative electrode 2; after the positive electrode 1 and the negative electrode 2 are stacked, the space surrounded by the first groove 11 and the second groove 21 forms an accumulation exhaust channel 104.

[0034] As an example, a portion or all of the accumulation venting channel 104 lies within the orthographic projection range of the explosion-proof valve 5; that is, when viewed from a direction perpendicular to the housing mounting surface, at least a portion of the accumulation venting channel 104 overlaps with the outline of the explosion-proof valve 5. In other words, the accumulation venting channel 104 and the explosion-proof valve 5 are spatially directly connected or arranged very close to each other to ensure that when the explosion-proof valve is open, the accumulated gas can be directly and efficiently discharged through the accumulation venting channel 104.

[0035] Based on the above embodiments, such as Figure 5As shown, when the battery cell experiences thermal runaway, the hot gas generated in the cell fills the reserved exhaust channel and the accumulation exhaust channel 104. Specifically, the hot gas generated in the cell fills the top exhaust channel 101, the side exhaust channel 102, the bottom exhaust channel 103, and the accumulation exhaust channel 104. The top exhaust channel 101, the side exhaust channel 102, the bottom exhaust channel 103, and the accumulation exhaust channel 104 are connected, and the internal hot gas is directionally discharged from the casing 4 through the explosion-proof valve 5. This directional discharge of hot gas from the casing ensures battery safety while improving gas discharge efficiency, enabling precise control of safety protection, achieving a two-way improvement in battery safety and energy density, and overcoming the problem of insufficient reserved gap between the battery cell and the casing.

[0036] Based on the above embodiments, as an example, the diameter of the top exhaust channel 101 is smaller than the diameter of the bottom exhaust channel 103, so that hot gas can be concentrated in the bottom space of the housing as much as possible. Preferably, the diameter of the top exhaust channel 101 is designed to be 0.35 mm, and the diameter of the bottom exhaust channel 103 is designed to be 1.35 mm.

[0037] As one example, such as Figure 4 As shown, the explosion-proof valve 5 is installed on the housing 4, and the explosion-proof valve 5 is connected to the accumulation exhaust channel 104 shown in the above embodiment.

[0038] For example, considerations for the groove depth and width include: ensuring electrolyte absorption and wetting capacity during battery cycling; avoiding excessive weakening of the electrode plate's structural strength; and being comparable to the width of the explosion-proof valve.

[0039] In one preferred embodiment, a U-shaped first groove 11 is formed on the positive electrode 1, with a length of 5-50 mm and a height of 3-20 mm; a U-shaped second groove 21 is formed on the negative electrode 2, with a length of 4-49 mm and a height of 2-19 mm. This allows for precise control of safety protection, overcomes the problem of insufficient reserved gaps, and improves the cycle life and safety performance of the battery.

[0040] In one embodiment of this application, a positive electrode tab 6 is connected to the positive electrode 1, and a negative electrode tab 7 is connected to the negative electrode 2. Explained, inside the battery, the current generated by the positive electrode 1 and the negative electrode 2 is converged through the tabs, facilitating efficient current transfer from the battery interior to the external circuit. The tabs are soldered or crimped to corresponding terminals on the casing, as shown in one example... Figure 3 As shown, the positive electrode tab 6 is electrically connected to the external circuit through the positive electrode post 9; the negative electrode tab 7 is electrically connected to the external circuit through the negative electrode post 8.

[0041] As one embodiment, after stacking, the positive and negative electrode tabs are exposed to a certain size, which can be set to 15-38mm.

[0042] As one embodiment, the areas of the positive electrode 1, the negative electrode 2, and the separator 3 increase sequentially, with the separator 3 covering the edge of the negative electrode 2. For example, as shown... Figure 1 , 2 As shown in Figure 6, to ensure the battery's long lifespan and safety, the area of ​​the negative electrode 2 is larger than that of the positive electrode 1. The volume change of lithium ions during insertion and extraction at the negative electrode is greater than that at the positive electrode. This capacity redundancy in the negative electrode prevents the formation of lithium dendrites and reduces the risk of internal short circuits. The area of ​​the separator 3 is larger than that of the negative electrode to ensure that it completely covers the negative electrode 2 during battery winding or stacking. Even under external pressure or deformation, it effectively isolates the positive and negative electrodes, preventing internal short circuits. Simultaneously, the extra area of ​​the separator provides storage space for the electrolyte, which is beneficial for uniform electrolyte distribution and electrode wetting, thereby improving battery performance.

[0043] Explained, the venting channels covered by the separator maintain the battery's internal seal under normal operating conditions, ensuring the electrolyte's wettability during battery cycling and maintaining internal pressure balance. In cases of abnormally high internal pressure, such as thermal runaway, the separator is designed to rupture or open upon reaching a certain pressure threshold, thereby releasing accumulated gas.

[0044] The separator 3 mentioned in the above embodiments is a porous material made of polymers, such as polyethylene (PE) or polypropylene (PP). The positive electrode 1 and negative electrode 2 are separated by the separator 3 and stacked in the casing 4. Inside the battery, the positive electrode 1, negative electrode 2, and separator 3 are alternately stacked in the order of positive electrode-separator-negative electrode-separator-positive electrode, as an example, wound into a spiral shape; preferably, stacked into a flat plate shape to increase the contact area between the positive and negative electrodes and the electrolyte, thereby improving the battery's capacity and power output. Placing as much electrode material as possible within a limited space increases energy density.

[0045] In one embodiment, a first groove 11 is disposed on the edge of the positive electrode 1, with its opening facing outwards. A second groove 21 is disposed on the edge of the negative electrode 2, with its opening facing outwards. The openings of both grooves face outwards, meaning they are open to the outside, to accommodate the electrolyte and separator in the cell, while also providing a venting channel towards the explosion-proof valve. Based on the above embodiment, as... Figure 4 As shown, the first groove 11 and the second groove 21 may partially or completely overlap along the width direction of the battery cell.

[0046] In existing technology, the battery terminals and the explosion-proof valve are located on the same side. When the battery experiences thermal runaway in an abnormal state, the explosion-proof valve opens, and high-temperature, high-pressure jets such as electrolyte are ejected from the battery. These jets can easily reach the battery terminals and also dissipate heat to other batteries, further exacerbating thermal runaway and increasing the safety risk. Based on this, this application provides an embodiment where the first groove 11 and the positive electrode tab 6 are on different sides, and the second groove 21 and the negative electrode tab 7 are on different sides. By placing the positive electrode tab 6 on the first groove 11 and the negative electrode tab 7 on the second groove 21 on different sides, high-voltage arcing can be prevented to some extent during thermal runaway, thereby improving battery safety. Explained, under high-voltage conditions, arcing can occur between two conductors due to excessively high electric field strength. Inside a battery, if the positive and negative electrode tabs are on the same side as the grooves on the electrode plates (or any structure that could cause material spalling or debris accumulation), when the battery is subjected to external impact, puncture, or high temperature and pressure during thermal runaway, fragments or molten material from the electrode materials may be ejected. If this material happens to land between the positive and negative electrode tabs, it can form a conductive path, leading to a momentary high-current discharge, i.e., high-voltage arcing. This situation not only exacerbates the battery's thermal runaway but may also cause a fire or explosion, posing a serious threat to personnel and equipment.

[0047] In one embodiment of this application, the positive electrode tab 6 and the negative electrode tab 7 are simultaneously led out from the top of the housing 4, and the explosion-proof valve 5 is installed at the bottom of the housing 4. Installing the explosion-proof valve at the bottom of the housing utilizes gravity to keep gas and liquid away from the electrical connections of the battery during depressurization, reducing damage to electrical components. Furthermore, in the event of thermal runaway or internal short circuit, the bottom explosion-proof valve opens, allowing any potentially leaking electrolyte or gas to drain downwards, reducing negative impacts on the surrounding environment, equipment, and even the cockpit. Leading the positive and negative electrodes out from the top of the housing facilitates connection to external circuitry.

[0048] One embodiment of this application, such as Figure 2 As shown, the positive electrode tab 6 and the negative electrode tab 7 extend from the two sides of the housing 4, respectively, and the explosion-proof valve 5 is installed at the bottom of the housing 4. Explainingly, designing the tabs on both sides of the battery housing offers several advantages. First, it allows for flexible adaptation to the battery layout requirements of different devices or systems, especially in space-constrained environments such as portable electronic devices and electric vehicle battery packs, enabling more efficient space utilization and improved overall integration. Second, the tabs extending from both sides can directly connect to adjacent batteries or circuit boards, reducing wiring complexity, simplifying the assembly process of battery modules or battery packs, and lowering production costs. Third, the tabs on both sides facilitate lateral heat dissipation, especially when batteries are installed side-by-side; the gaps between adjacent batteries can form natural heat dissipation channels, contributing to overall thermal management.

[0049] In one embodiment of this application, the positive electrode tab 6 and the negative electrode tab 7 extend simultaneously from the top of the housing 4, and the explosion-proof valve 5 is installed on the side of the housing 4. Explained, the side-mounted explosion-proof valve can quickly respond to abnormal increases in internal battery pressure, releasing pressure in a timely manner to prevent battery explosion. Compared to bottom-mounted valves, side-mounted explosion-proof valves can operate effectively even when the battery is horizontal or tilted. Furthermore, the side-mounted explosion-proof valve is easier to inspect and maintain, especially within battery packs or equipment, requiring minimal component disassembly for access, facilitating regular safety checks and necessary replacement.

[0050] In one embodiment of this application, the positive electrode tab 6 and the negative electrode tab 7 are simultaneously led out from one side of the housing 4, and the explosion-proof valve 5 is installed at the bottom of the housing 4.

[0051] In one embodiment of this application, at least one explosion-proof valve 5 is installed at the bottom of the housing 4. Using at least one explosion-proof valve can be considered a redundant safety measure. If there are multiple explosion-proof valves, even if one fails, the others can still provide protection, improving the overall safety of the system. If there are multiple explosion-proof valves, the minimum installation distance between them should be at least 200 mm to avoid mutual interference.

[0052] In the above embodiments, the explosion-proof valve opens when the internal pressure of the battery exceeds its design threshold, which can be represented by the following logical expression: P≥P th P is the internal pressure of the battery. th This refers to the trigger pressure threshold of the explosion-proof valve.

[0053] Once the explosion-proof valve opens, gas begins to be discharged through the exhaust channel. The gas flow rate Q can be estimated using the following formula (assuming that the gas flow follows Bernoulli's equation and the continuity equation):

[0054] Q = A·v, where A is the cross-sectional area of ​​the exhaust channel and v is the average flow velocity of the gas through the exhaust channel;

[0055] In the simplified model, it is assumed that v and PP atm Proportional, where P atm Since the pressure is atmospheric pressure, v can be expressed as: v = k(PP) atm ), where k is a constant representing the physical properties related to gas flow.

[0056] Integrating the above relationships, we obtain the relationship between gas flow rate Q and battery internal pressure P: Q = A·k(PP) atm ).

[0057] In one embodiment of this application, multiple explosion-proof valves 5 can be installed at the bottom of the housing 4, ensuring that the centers of the multiple explosion-proof valves 5 are located within the spatial envelope of the exhaust channel. This ensures that in the event of thermal runaway or abnormal increase in internal pressure, the battery pack can quickly act on the explosion-proof valves 5, causing them to open rapidly and safely release pressure, thus providing a certain degree of safety redundancy. For illustrative purposes, the spatial envelope of the exhaust channel is the maximum outer boundary of the exhaust channel.

[0058] The exhaust passage should have a sufficiently large spatial envelope to ensure smooth gas flow without creating a bottleneck at the passage inlet, accommodating gas flow at the maximum pressure release rate of the explosion-proof valve. The exhaust passage should be designed to direct gas to a safe area outside the vehicle, preventing direct emission into the passenger compartment or other sensitive areas.

[0059] The connection between the explosion-proof valve and the housing should be secure and reliable to prevent any leakage in the inactive state. Use appropriate sealing materials and fasteners to ensure the sealing and stability of the connection.

[0060] One embodiment of this application provides a battery pack comprising the battery cells described in the above embodiment. Multiple battery cells are combined in series or parallel. The battery cells can be cylindrical, prismatic, or pouch-type, with the appropriate type selected based on application requirements and performance specifications.

[0061] One embodiment of this application provides a vehicle, which includes: a vehicle body; and a battery pack mentioned in the above embodiment disposed within the vehicle body. The vehicle design is applicable to various types of electric vehicles, including electric vehicles (EVs), plug-in hybrid electric vehicles (PHEVs), pure electric buses, electric trucks, electric motorcycles, etc.

[0062] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0063] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A battery cell, characterized in that: include: The assembly includes a positive electrode (1), a negative electrode (2), a diaphragm (3), a housing (4), and an explosion-proof valve (5). The positive electrode (1) and the negative electrode (2) are separated by the diaphragm (3) and stacked in the housing (4). A first groove (11) is formed on one end of the positive electrode (1), and a second groove (21) is formed on one end of the negative electrode (2). The first groove (11) and the second groove (21) are arranged opposite to each other, and the space enclosed by them forms an accumulation exhaust channel (104). The explosion-proof valve (5) is installed on the housing (4), and the accumulation exhaust channel (104) is located inside the explosion-proof valve (5) in the orthogonal projection of the explosion-proof valve (5) on the housing mounting surface.

2. The battery cell as described in claim 1, characterized in that: The first groove (11) is disposed on the edge of the positive electrode (1) and the opening direction of the first groove (11) faces the outside of the positive electrode (1). The second groove (21) is disposed on the edge of the negative electrode (2) and the opening direction of the second groove (21) faces the outside of the negative electrode (2).

3. A battery cell as described in claim 1, characterized in that: The positive electrode (1) and the negative electrode (2) are separated by the diaphragm (3) and stacked in the housing (4) with a reserved exhaust channel between them. The reserved exhaust channel is connected to the accumulation exhaust channel (104).

4. A battery cell as described in claim 1, characterized in that: A positive electrode tab (6) is connected to the positive electrode plate (1), and a negative electrode tab (7) is connected to the negative electrode plate (2); the first groove (11) and the positive electrode tab (6) are located on opposite sides of the positive electrode plate (1), and the second groove (21) and the negative electrode tab (7) are located on opposite sides of the negative electrode plate (2).

5. A battery cell as described in claim 2, characterized in that: The opening directions of the first groove (11) and the second groove (21) are both facing the bottom of the housing (4), and the explosion-proof valve (5) is located at the bottom of the housing (4).

6. A battery cell as described in claim 1, characterized in that: The areas of the positive electrode (1), negative electrode (2) and separator (3) increase sequentially, and the separator (3) covers the edge of the negative electrode (2).

7. A battery cell as described in claim 6, characterized in that: The diaphragm (3) extends into the accumulation exhaust channel (104) and divides the accumulation exhaust channel (104).

8. A battery cell as described in any one of claims 1-7, characterized in that: There is at least one explosion-proof valve (5), and the spatial center of the at least one explosion-proof valve (5) is located within the spatial envelope of the accumulation exhaust channel (104).

9. A battery pack, characterized in that: Includes the battery cell as described in any one of claims 1-8.

10. A vehicle, characterized in that: The vehicles include: The vehicle body; the battery pack as described in claim 9 disposed within the vehicle body.

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